Fixed MTP to work with TWRP

drivers/leds/Kconfig

@@ -0,0 +1,572 @@
+config LEDS_GPIO_REGISTER
+	bool
+	help
+	  This option provides the function gpio_led_register_device.
+	  As this function is used by arch code it must not be compiled as a
+	  module.
+
+menuconfig NEW_LEDS
+	bool "LED Support"
+	help
+	  Say Y to enable Linux LED support.  This allows control of supported
+	  LEDs from both userspace and optionally, by kernel events (triggers).
+
+	  This is not related to standard keyboard LEDs which are controlled
+	  via the input system.
+
+if NEW_LEDS
+
+config LEDS_CLASS
+	tristate "LED Class Support"
+	help
+	  This option enables the led sysfs class in /sys/class/leds.  You'll
+	  need this to do anything useful with LEDs.  If unsure, say N.
+
+comment "LED drivers"
+
+config LEDS_88PM860X
+	tristate "LED Support for Marvell 88PM860x PMIC"
+	depends on LEDS_CLASS
+	depends on MFD_88PM860X
+	help
+	  This option enables support for on-chip LED drivers found on Marvell
+	  Semiconductor 88PM8606 PMIC.
+
+config LEDS_LM3530
+	tristate "LCD Backlight driver for LM3530"
+	depends on LEDS_CLASS
+	depends on I2C
+	help
+	  This option enables support for the LCD backlight using
+	  LM3530 ambient light sensor chip. This ALS chip can be
+	  controlled manually or using PWM input or using ambient
+	  light automatically.
+
+config LEDS_LM3533
+	tristate "LED support for LM3533"
+	depends on LEDS_CLASS
+	depends on MFD_LM3533
+	help
+	  This option enables support for the LEDs on National Semiconductor /
+	  TI LM3533 Lighting Power chips.
+
+	  The LEDs can be controlled directly, through PWM input, or by the
+	  ambient-light-sensor interface. The chip supports
+	  hardware-accelerated blinking with maximum on and off periods of 9.8
+	  and 77 seconds respectively.
+
+config LEDS_LM3642
+	tristate "LED support for LM3642 Chip"
+	depends on LEDS_CLASS && I2C
+	select REGMAP_I2C
+	help
+	  This option enables support for LEDs connected to LM3642.
+	  The LM3642 is a 4MHz fixed-frequency synchronous boost
+	  converter plus 1.5A constant current driver for a high-current
+	  white LED.
+
+
+config LEDS_LOCOMO
+	tristate "LED Support for Locomo device"
+	depends on LEDS_CLASS
+	depends on SHARP_LOCOMO
+	help
+	  This option enables support for the LEDs on Sharp Locomo.
+	  Zaurus models SL-5500 and SL-5600.
+
+config LEDS_MIKROTIK_RB532
+	tristate "LED Support for Mikrotik Routerboard 532"
+	depends on LEDS_CLASS
+	depends on MIKROTIK_RB532
+	help
+	  This option enables support for the so called "User LED" of
+	  Mikrotik's Routerboard 532.
+
+config LEDS_S3C24XX
+	tristate "LED Support for Samsung S3C24XX GPIO LEDs"
+	depends on LEDS_CLASS
+	depends on ARCH_S3C24XX
+	help
+	  This option enables support for LEDs connected to GPIO lines
+	  on Samsung S3C24XX series CPUs, such as the S3C2410 and S3C2440.
+
+config LEDS_NET48XX
+	tristate "LED Support for Soekris net48xx series Error LED"
+	depends on LEDS_CLASS
+	depends on SCx200_GPIO
+	help
+	  This option enables support for the Soekris net4801 and net4826 error
+	  LED.
+
+config LEDS_FSG
+	tristate "LED Support for the Freecom FSG-3"
+	depends on LEDS_CLASS
+	depends on MACH_FSG
+	help
+	  This option enables support for the LEDs on the Freecom FSG-3.
+
+config LEDS_WRAP
+	tristate "LED Support for the WRAP series LEDs"
+	depends on LEDS_CLASS
+	depends on SCx200_GPIO
+	help
+	  This option enables support for the PCEngines WRAP programmable LEDs.
+
+config LEDS_COBALT_QUBE
+	tristate "LED Support for the Cobalt Qube series front LED"
+	depends on LEDS_CLASS
+	depends on MIPS_COBALT
+	help
+	  This option enables support for the front LED on Cobalt Qube series
+
+config LEDS_COBALT_RAQ
+	bool "LED Support for the Cobalt Raq series"
+	depends on LEDS_CLASS=y && MIPS_COBALT
+	select LEDS_TRIGGERS
+	help
+	  This option enables support for the Cobalt Raq series LEDs.
+
+config LEDS_SUNFIRE
+	tristate "LED support for SunFire servers."
+	depends on LEDS_CLASS
+	depends on SPARC64
+	select LEDS_TRIGGERS
+	help
+	  This option enables support for the Left, Middle, and Right
+	  LEDs on the I/O and CPU boards of SunFire UltraSPARC servers.
+
+config LEDS_IPAQ_MICRO
+	tristate "LED Support for the Compaq iPAQ h3xxx"
+	depends on MFD_IPAQ_MICRO
+	help
+	  Choose this option if you want to use the notification LED on
+	  Compaq/HP iPAQ h3100 and h3600.
+
+config LEDS_HP6XX
+	tristate "LED Support for the HP Jornada 6xx"
+	depends on LEDS_CLASS
+	depends on SH_HP6XX
+	help
+	  This option enables LED support for the handheld
+	  HP Jornada 620/660/680/690.
+
+config LEDS_PCA9532
+	tristate "LED driver for PCA9532 dimmer"
+	depends on LEDS_CLASS
+	depends on I2C && INPUT
+	help
+	  This option enables support for NXP pca9532
+	  LED controller. It is generally only useful
+	  as a platform driver
+
+config LEDS_PCA9532_GPIO
+	bool "Enable GPIO support for PCA9532"
+	depends on LEDS_PCA9532
+	depends on GPIOLIB
+	help
+	  Allow unused pins on PCA9532 to be used as gpio.
+
+	  To use a pin as gpio pca9532_type in pca9532_platform data needs to
+	  set to PCA9532_TYPE_GPIO.
+
+config LEDS_GPIO
+	tristate "LED Support for GPIO connected LEDs"
+	depends on LEDS_CLASS
+	depends on GPIOLIB
+	help
+	  This option enables support for the LEDs connected to GPIO
+	  outputs. To be useful the particular board must have LEDs
+	  and they must be connected to the GPIO lines.  The LEDs must be
+	  defined as platform devices and/or OpenFirmware platform devices.
+	  The code to use these bindings can be selected below.
+
+config LEDS_LP3944
+	tristate "LED Support for N.S. LP3944 (Fun Light) I2C chip"
+	depends on LEDS_CLASS
+	depends on I2C
+	help
+	  This option enables support for LEDs connected to the National
+	  Semiconductor LP3944 Lighting Management Unit (LMU) also known as
+	  Fun Light Chip.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called leds-lp3944.
+
+config LEDS_LP55XX_COMMON
+	tristate "Common Driver for TI/National LP5521/5523/55231/5562/8501"
+	depends on LEDS_LP5521 || LEDS_LP5523 || LEDS_LP5562 || LEDS_LP8501
+	select FW_LOADER
+	help
+	  This option supports common operations for LP5521/5523/55231/5562/8501
+	  devices.
+
+config LEDS_LP5521
+	tristate "LED Support for N.S. LP5521 LED driver chip"
+	depends on LEDS_CLASS && I2C
+	select LEDS_LP55XX_COMMON
+	help
+	  If you say yes here you get support for the National Semiconductor
+	  LP5521 LED driver. It is 3 channel chip with programmable engines.
+	  Driver provides direct control via LED class and interface for
+	  programming the engines.
+
+config LEDS_LP5523
+	tristate "LED Support for TI/National LP5523/55231 LED driver chip"
+	depends on LEDS_CLASS && I2C
+	select LEDS_LP55XX_COMMON
+	help
+	  If you say yes here you get support for TI/National Semiconductor
+	  LP5523/55231 LED driver.
+	  It is 9 channel chip with programmable engines.
+	  Driver provides direct control via LED class and interface for
+	  programming the engines.
+
+config LEDS_LP5562
+	tristate "LED Support for TI LP5562 LED driver chip"
+	depends on LEDS_CLASS && I2C
+	select LEDS_LP55XX_COMMON
+	help
+	  If you say yes here you get support for TI LP5562 LED driver.
+	  It is 4 channels chip with programmable engines.
+	  Driver provides direct control via LED class and interface for
+	  programming the engines.
+
+config LEDS_LP8501
+	tristate "LED Support for TI LP8501 LED driver chip"
+	depends on LEDS_CLASS && I2C
+	select LEDS_LP55XX_COMMON
+	help
+	  If you say yes here you get support for TI LP8501 LED driver.
+	  It is 9 channel chip with programmable engines.
+	  Driver provides direct control via LED class and interface for
+	  programming the engines.
+	  It is similar as LP5523, but output power selection is available.
+	  And register layout and engine program schemes are different.
+
+config LEDS_LP8788
+	tristate "LED support for the TI LP8788 PMIC"
+	depends on LEDS_CLASS
+	depends on MFD_LP8788
+	help
+	  This option enables support for the Keyboard LEDs on the LP8788 PMIC.
+
+config LEDS_CLEVO_MAIL
+	tristate "Mail LED on Clevo notebook"
+	depends on LEDS_CLASS
+	depends on X86 && SERIO_I8042 && DMI
+	help
+	  This driver makes the mail LED accessible from userspace
+	  programs through the leds subsystem. This LED have three
+	  known mode: off, blink at 0.5Hz and blink at 1Hz.
+
+	  The driver supports two kinds of interface: using ledtrig-timer
+	  or through /sys/class/leds/clevo::mail/brightness. As this LED
+	  cannot change it's brightness it blinks instead. The brightness
+	  value 0 means off, 1..127 means blink at 0.5Hz and 128..255 means
+	  blink at 1Hz.
+
+	  This module can drive the mail LED for the following notebooks:
+
+	  	Clevo D400P
+	  	Clevo D410J
+	  	Clevo D410V
+	  	Clevo D400V/D470V (not tested, but might work)
+	  	Clevo M540N
+	  	Clevo M5x0N (not tested, but might work)
+	  	Positivo Mobile (Clevo M5x0V)
+
+	  If your model is not listed here you can try the "nodetect"
+	  module parameter.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called leds-clevo-mail.
+
+config LEDS_PCA955X
+	tristate "LED Support for PCA955x I2C chips"
+	depends on LEDS_CLASS
+	depends on I2C
+	help
+	  This option enables support for LEDs connected to PCA955x
+	  LED driver chips accessed via the I2C bus.  Supported
+	  devices include PCA9550, PCA9551, PCA9552, and PCA9553.
+
+config LEDS_PCA963X
+	tristate "LED support for PCA963x I2C chip"
+	depends on LEDS_CLASS
+	depends on I2C
+	help
+	  This option enables support for LEDs connected to the PCA963x
+	  LED driver chip accessed via the I2C bus. Supported
+	  devices include PCA9633 and PCA9634
+
+config LEDS_WM831X_STATUS
+	tristate "LED support for status LEDs on WM831x PMICs"
+	depends on LEDS_CLASS
+	depends on MFD_WM831X
+	help
+	  This option enables support for the status LEDs of the WM831x
+          series of PMICs.
+
+config LEDS_WM8350
+	tristate "LED Support for WM8350 AudioPlus PMIC"
+	depends on LEDS_CLASS
+	depends on MFD_WM8350
+	help
+	  This option enables support for LEDs driven by the Wolfson
+	  Microelectronics WM8350 AudioPlus PMIC.
+
+config LEDS_DA903X
+	tristate "LED Support for DA9030/DA9034 PMIC"
+	depends on LEDS_CLASS
+	depends on PMIC_DA903X
+	help
+	  This option enables support for on-chip LED drivers found
+	  on Dialog Semiconductor DA9030/DA9034 PMICs.
+
+config LEDS_DA9052
+	tristate "Dialog DA9052/DA9053 LEDS"
+	depends on LEDS_CLASS
+	depends on PMIC_DA9052
+	help
+	  This option enables support for on-chip LED drivers found
+	  on Dialog Semiconductor DA9052-BC and DA9053-AA/Bx PMICs.
+
+config LEDS_DAC124S085
+	tristate "LED Support for DAC124S085 SPI DAC"
+	depends on LEDS_CLASS
+	depends on SPI
+	help
+	  This option enables support for DAC124S085 SPI DAC from NatSemi,
+	  which can be used to control up to four LEDs.
+
+config LEDS_PWM
+	tristate "PWM driven LED Support"
+	depends on LEDS_CLASS
+	depends on PWM
+	help
+	  This option enables support for pwm driven LEDs
+
+config LEDS_REGULATOR
+	tristate "REGULATOR driven LED support"
+	depends on LEDS_CLASS
+	depends on REGULATOR
+	help
+	  This option enables support for regulator driven LEDs.
+
+config LEDS_BD2802
+	tristate "LED driver for BD2802 RGB LED"
+	depends on LEDS_CLASS
+	depends on I2C
+	help
+	  This option enables support for BD2802GU RGB LED driver chips
+	  accessed via the I2C bus.
+
+config LEDS_INTEL_SS4200
+	tristate "LED driver for Intel NAS SS4200 series"
+	depends on LEDS_CLASS
+	depends on PCI && DMI
+	help
+	  This option enables support for the Intel SS4200 series of
+	  Network Attached Storage servers.  You may control the hard
+	  drive or power LEDs on the front panel.  Using this driver
+	  can stop the front LED from blinking after startup.
+
+config LEDS_LT3593
+	tristate "LED driver for LT3593 controllers"
+	depends on LEDS_CLASS
+	depends on GPIOLIB
+	help
+	  This option enables support for LEDs driven by a Linear Technology
+	  LT3593 controller. This controller uses a special one-wire pulse
+	  coding protocol to set the brightness.
+
+config LEDS_ADP5520
+	tristate "LED Support for ADP5520/ADP5501 PMIC"
+	depends on LEDS_CLASS
+	depends on PMIC_ADP5520
+	help
+	  This option enables support for on-chip LED drivers found
+	  on Analog Devices ADP5520/ADP5501 PMICs.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called leds-adp5520.
+
+config LEDS_DELL_NETBOOKS
+	tristate "External LED on Dell Business Netbooks"
+	depends on LEDS_CLASS
+	depends on X86 && ACPI_WMI
+	help
+	  This adds support for the Latitude 2100 and similar
+	  notebooks that have an external LED.
+
+config LEDS_MC13783
+	tristate "LED Support for MC13XXX PMIC"
+	depends on LEDS_CLASS
+	depends on MFD_MC13XXX
+	help
+	  This option enable support for on-chip LED drivers found
+	  on Freescale Semiconductor MC13783/MC13892/MC34708 PMIC.
+
+config LEDS_NS2
+	tristate "LED support for Network Space v2 GPIO LEDs"
+	depends on LEDS_CLASS
+	depends on MACH_KIRKWOOD
+	default y
+	help
+	  This option enable support for the dual-GPIO LED found on the
+	  Network Space v2 board (and parents). This include Internet Space v2,
+	  Network Space (Max) v2 and d2 Network v2 boards.
+
+config LEDS_NETXBIG
+	tristate "LED support for Big Network series LEDs"
+	depends on LEDS_CLASS
+	depends on MACH_KIRKWOOD
+	default y
+	help
+	  This option enable support for LEDs found on the LaCie 2Big
+	  and 5Big Network v2 boards. The LEDs are wired to a CPLD and are
+	  controlled through a GPIO extension bus.
+
+config LEDS_ASIC3
+	bool "LED support for the HTC ASIC3"
+	depends on LEDS_CLASS=y
+	depends on MFD_ASIC3
+	default y
+	help
+	  This option enables support for the LEDs on the HTC ASIC3. The HTC
+	  ASIC3 LED GPIOs are inputs, not outputs, thus the leds-gpio driver
+	  cannot be used. This driver supports hardware blinking with an on+off
+	  period from 62ms to 125s. Say Y to enable LEDs on the HP iPAQ hx4700.
+
+config LEDS_TCA6507
+	tristate "LED Support for TCA6507 I2C chip"
+	depends on LEDS_CLASS && I2C
+	help
+	  This option enables support for LEDs connected to TC6507
+	  LED driver chips accessed via the I2C bus.
+	  Driver support brightness control and hardware-assisted blinking.
+
+config LEDS_MAX8997
+	tristate "LED support for MAX8997 PMIC"
+	depends on LEDS_CLASS && MFD_MAX8997
+	help
+	  This option enables support for on-chip LED drivers on
+	  MAXIM MAX8997 PMIC.
+
+config LEDS_LM355x
+	tristate "LED support for LM355x Chips, LM3554 and LM3556"
+	depends on LEDS_CLASS && I2C
+	select REGMAP_I2C
+	help
+	  This option enables support for LEDs connected to LM355x.
+	  LM355x includes Torch, Flash and Indicator functions.
+
+config LEDS_OT200
+	tristate "LED support for the Bachmann OT200"
+	depends on LEDS_CLASS && HAS_IOMEM && (X86_32 || COMPILE_TEST)
+	help
+	  This option enables support for the LEDs on the Bachmann OT200.
+	  Say Y to enable LEDs on the Bachmann OT200.
+
+config LEDS_MENF21BMC
+	tristate "LED support for the MEN 14F021P00 BMC"
+	depends on LEDS_CLASS && MFD_MENF21BMC
+	help
+	  Say Y here to include support for the MEN 14F021P00 BMC LEDs.
+
+	  This driver can also be built as a module. If so the module
+	  will be called leds-menf21bmc.
+
+comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
+
+config LEDS_BLINKM
+	tristate "LED support for the BlinkM I2C RGB LED"
+	depends on LEDS_CLASS
+	depends on I2C
+	help
+	  This option enables support for the BlinkM RGB LED connected
+	  through I2C. Say Y to enable support for the BlinkM LED.
+
+config LEDS_SYSCON
+	bool "LED support for LEDs on system controllers"
+	depends on LEDS_CLASS=y
+	depends on MFD_SYSCON
+	depends on OF
+	help
+	  This option enabled support for the LEDs on syscon type
+	  devices. This will only work with device tree enabled
+	  devices.
+
+config LEDS_VERSATILE
+	tristate "LED support for the ARM Versatile and RealView"
+	depends on ARCH_REALVIEW || ARCH_VERSATILE
+	depends on LEDS_CLASS
+	help
+	  This option enabled support for the LEDs on the ARM Versatile
+	  and RealView boards. Say Y to enabled these.
+
+config LEDS_S2MPB02
+	bool "LED support for the S2MPB02"
+	depends on LEDS_CLASS
+	help
+	  This option enables support for the LEDs on the S2MPB02.
+
+config LEDS_S2MU003
+	bool "LED support for the S2MU003"
+	depends on LEDS_CLASS
+	help
+	  This option enables support for the LEDs on the S2MU003.
+
+config S2MU003_LEDS_I2C
+	bool "LED support for the S2MU003"
+	depends on LEDS_S2MU003
+	help
+	  This option enables support for the LEDs on the S2MU003.
+
+config LEDS_S2MU005_FLASH
+	bool "LED support for the S2MU005"
+	depends on LEDS_CLASS
+	help
+	  This option enables support for the LEDs on the S2MU005.
+
+config S2MU005_LEDS_I2C
+	bool "LED support for the S2MU005"
+	help
+	  This option enables support for the LEDs on the S2MU003.
+
+comment "LED Triggers"
+source "drivers/leds/trigger/Kconfig"
+
+config LEDS_KTD2026
+        tristate "LED driver for KTD2026 LED"
+        depends on I2C
+          help
+          This option enables support for RGB LED driver
+          accessed via the I2C bus.
+          KTD2026 is a fully programmable, constant current
+          three channel LED driver with flexible control interface.
+
+config LEDS_KTD2026_PANEL
+        tristate "LED driver for KTD2026 LED to make a different brightness"
+        depends on LEDS_KTD2026
+          help
+            If you say yes here you will get support for
+            different brightness in panels
+
+config LEDS_KTD2692
+	bool "LED support for the KTD2692"
+	help
+	If you say yes here you will get support for
+	for the KTD2692 FLASH led chip.
+
+config USE_LIGHT_SENSOR
+        bool "Light sensor use or not in LED driver for KTD2026 LED"
+        depends on LEDS_KTD2026
+	default n
+
+config LEDS_SUPPORT_FRONT_FLASH
+	bool "LED support for Front Flash"
+	help
+	  This option enables support for the LEDs.
+
+endif # NEW_LEDS

drivers/leds/Makefile

@@ -0,0 +1,69 @@
+
+# LED Core
+obj-$(CONFIG_NEW_LEDS)			+= led-core.o
+obj-$(CONFIG_LEDS_CLASS)		+= led-class.o
+obj-$(CONFIG_LEDS_TRIGGERS)		+= led-triggers.o
+
+# LED Platform Drivers
+obj-$(CONFIG_LEDS_88PM860X)		+= leds-88pm860x.o
+obj-$(CONFIG_LEDS_BD2802)		+= leds-bd2802.o
+obj-$(CONFIG_LEDS_LOCOMO)		+= leds-locomo.o
+obj-$(CONFIG_LEDS_LM3530)		+= leds-lm3530.o
+obj-$(CONFIG_LEDS_LM3533)		+= leds-lm3533.o
+obj-$(CONFIG_LEDS_LM3642)		+= leds-lm3642.o
+obj-$(CONFIG_LEDS_MIKROTIK_RB532)	+= leds-rb532.o
+obj-$(CONFIG_LEDS_S3C24XX)		+= leds-s3c24xx.o
+obj-$(CONFIG_LEDS_NET48XX)		+= leds-net48xx.o
+obj-$(CONFIG_LEDS_WRAP)			+= leds-wrap.o
+obj-$(CONFIG_LEDS_COBALT_QUBE)		+= leds-cobalt-qube.o
+obj-$(CONFIG_LEDS_COBALT_RAQ)		+= leds-cobalt-raq.o
+obj-$(CONFIG_LEDS_SUNFIRE)		+= leds-sunfire.o
+obj-$(CONFIG_LEDS_PCA9532)		+= leds-pca9532.o
+obj-$(CONFIG_LEDS_GPIO_REGISTER)	+= leds-gpio-register.o
+obj-$(CONFIG_LEDS_GPIO)			+= leds-gpio.o
+obj-$(CONFIG_LEDS_LP3944)		+= leds-lp3944.o
+obj-$(CONFIG_LEDS_LP55XX_COMMON)	+= leds-lp55xx-common.o
+obj-$(CONFIG_LEDS_LP5521)		+= leds-lp5521.o
+obj-$(CONFIG_LEDS_LP5523)		+= leds-lp5523.o
+obj-$(CONFIG_LEDS_LP5562)		+= leds-lp5562.o
+obj-$(CONFIG_LEDS_LP8501)		+= leds-lp8501.o
+obj-$(CONFIG_LEDS_LP8788)		+= leds-lp8788.o
+obj-$(CONFIG_LEDS_TCA6507)		+= leds-tca6507.o
+obj-$(CONFIG_LEDS_CLEVO_MAIL)		+= leds-clevo-mail.o
+obj-$(CONFIG_LEDS_IPAQ_MICRO)		+= leds-ipaq-micro.o
+obj-$(CONFIG_LEDS_HP6XX)		+= leds-hp6xx.o
+obj-$(CONFIG_LEDS_OT200)		+= leds-ot200.o
+obj-$(CONFIG_LEDS_FSG)			+= leds-fsg.o
+obj-$(CONFIG_LEDS_PCA955X)		+= leds-pca955x.o
+obj-$(CONFIG_LEDS_PCA963X)		+= leds-pca963x.o
+obj-$(CONFIG_LEDS_DA903X)		+= leds-da903x.o
+obj-$(CONFIG_LEDS_DA9052)		+= leds-da9052.o
+obj-$(CONFIG_LEDS_WM831X_STATUS)	+= leds-wm831x-status.o
+obj-$(CONFIG_LEDS_WM8350)		+= leds-wm8350.o
+obj-$(CONFIG_LEDS_PWM)			+= leds-pwm.o
+obj-$(CONFIG_LEDS_REGULATOR)		+= leds-regulator.o
+obj-$(CONFIG_LEDS_INTEL_SS4200)		+= leds-ss4200.o
+obj-$(CONFIG_LEDS_LT3593)		+= leds-lt3593.o
+obj-$(CONFIG_LEDS_ADP5520)		+= leds-adp5520.o
+obj-$(CONFIG_LEDS_DELL_NETBOOKS)	+= dell-led.o
+obj-$(CONFIG_LEDS_MC13783)		+= leds-mc13783.o
+obj-$(CONFIG_LEDS_NS2)			+= leds-ns2.o
+obj-$(CONFIG_LEDS_NETXBIG)		+= leds-netxbig.o
+obj-$(CONFIG_LEDS_ASIC3)		+= leds-asic3.o
+obj-$(CONFIG_LEDS_MAX8997)		+= leds-max8997.o
+obj-$(CONFIG_LEDS_LM355x)		+= leds-lm355x.o
+obj-$(CONFIG_LEDS_BLINKM)		+= leds-blinkm.o
+obj-$(CONFIG_LEDS_SYSCON)		+= leds-syscon.o
+obj-$(CONFIG_LEDS_VERSATILE)		+= leds-versatile.o
+obj-$(CONFIG_LEDS_MENF21BMC)		+= leds-menf21bmc.o
+obj-$(CONFIG_LEDS_S2MU003)		+= leds-s2mu003.o
+obj-$(CONFIG_LEDS_S2MPB02)		+= leds-s2mpb02.o
+obj-$(CONFIG_LEDS_S2MU005_FLASH)	+= leds-s2mu005.o
+obj-$(CONFIG_LEDS_KTD2026)              += leds-ktd2026.o
+obj-$(CONFIG_LEDS_KTD2692)              += leds-ktd2692.o
+
+# LED SPI Drivers
+obj-$(CONFIG_LEDS_DAC124S085)		+= leds-dac124s085.o
+
+# LED Triggers
+obj-$(CONFIG_LEDS_TRIGGERS)		+= trigger/

drivers/leds/dell-led.c

@@ -0,0 +1,359 @@
+/*
+ * dell_led.c - Dell LED Driver
+ *
+ * Copyright (C) 2010 Dell Inc.
+ * Louis Davis <louis_davis@dell.com>
+ * Jim Dailey <jim_dailey@dell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/acpi.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/dmi.h>
+#include <linux/dell-led.h>
+
+MODULE_AUTHOR("Louis Davis/Jim Dailey");
+MODULE_DESCRIPTION("Dell LED Control Driver");
+MODULE_LICENSE("GPL");
+
+#define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"
+#define DELL_APP_GUID "A80593CE-A997-11DA-B012-B622A1EF5492"
+MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
+
+/* Error Result Codes: */
+#define INVALID_DEVICE_ID	250
+#define INVALID_PARAMETER	251
+#define INVALID_BUFFER		252
+#define INTERFACE_ERROR		253
+#define UNSUPPORTED_COMMAND	254
+#define UNSPECIFIED_ERROR	255
+
+/* Device ID */
+#define DEVICE_ID_PANEL_BACK	1
+
+/* LED Commands */
+#define CMD_LED_ON	16
+#define CMD_LED_OFF	17
+#define CMD_LED_BLINK	18
+
+struct app_wmi_args {
+	u16 class;
+	u16 selector;
+	u32 arg1;
+	u32 arg2;
+	u32 arg3;
+	u32 arg4;
+	u32 res1;
+	u32 res2;
+	u32 res3;
+	u32 res4;
+	char dummy[92];
+};
+
+#define GLOBAL_MIC_MUTE_ENABLE	0x364
+#define GLOBAL_MIC_MUTE_DISABLE	0x365
+
+struct dell_bios_data_token {
+	u16 tokenid;
+	u16 location;
+	u16 value;
+};
+
+struct __attribute__ ((__packed__)) dell_bios_calling_interface {
+	struct	dmi_header header;
+	u16	cmd_io_addr;
+	u8	cmd_io_code;
+	u32	supported_cmds;
+	struct	dell_bios_data_token damap[];
+};
+
+static struct dell_bios_data_token dell_mic_tokens[2];
+
+static int dell_wmi_perform_query(struct app_wmi_args *args)
+{
+	struct app_wmi_args *bios_return;
+	union acpi_object *obj;
+	struct acpi_buffer input;
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	acpi_status status;
+	u32 rc = -EINVAL;
+
+	input.length = 128;
+	input.pointer = args;
+
+	status = wmi_evaluate_method(DELL_APP_GUID, 0, 1, &input, &output);
+	if (!ACPI_SUCCESS(status))
+		goto err_out0;
+
+	obj = output.pointer;
+	if (!obj)
+		goto err_out0;
+
+	if (obj->type != ACPI_TYPE_BUFFER)
+		goto err_out1;
+
+	bios_return = (struct app_wmi_args *)obj->buffer.pointer;
+	rc = bios_return->res1;
+	if (rc)
+		goto err_out1;
+
+	memcpy(args, bios_return, sizeof(struct app_wmi_args));
+	rc = 0;
+
+ err_out1:
+	kfree(obj);
+ err_out0:
+	return rc;
+}
+
+static void __init find_micmute_tokens(const struct dmi_header *dm, void *dummy)
+{
+	struct dell_bios_calling_interface *calling_interface;
+	struct dell_bios_data_token *token;
+	int token_size = sizeof(struct dell_bios_data_token);
+	int i = 0;
+
+	if (dm->type == 0xda && dm->length > 17) {
+		calling_interface = container_of(dm,
+				struct dell_bios_calling_interface, header);
+
+		token = &calling_interface->damap[i];
+		while (token->tokenid != 0xffff) {
+			if (token->tokenid == GLOBAL_MIC_MUTE_DISABLE)
+				memcpy(&dell_mic_tokens[0], token, token_size);
+			else if (token->tokenid == GLOBAL_MIC_MUTE_ENABLE)
+				memcpy(&dell_mic_tokens[1], token, token_size);
+
+			i++;
+			token = &calling_interface->damap[i];
+		}
+	}
+}
+
+static int dell_micmute_led_set(int state)
+{
+	struct app_wmi_args args;
+	struct dell_bios_data_token *token;
+
+	if (!wmi_has_guid(DELL_APP_GUID))
+		return -ENODEV;
+
+	if (state == 0 || state == 1)
+		token = &dell_mic_tokens[state];
+	else
+		return -EINVAL;
+
+	memset(&args, 0, sizeof(struct app_wmi_args));
+
+	args.class = 1;
+	args.arg1 = token->location;
+	args.arg2 = token->value;
+
+	dell_wmi_perform_query(&args);
+
+	return state;
+}
+
+int dell_app_wmi_led_set(int whichled, int on)
+{
+	int state = 0;
+
+	switch (whichled) {
+	case DELL_LED_MICMUTE:
+		state = dell_micmute_led_set(on);
+		break;
+	default:
+		pr_warn("led type %x is not supported\n", whichled);
+		break;
+	}
+
+	return state;
+}
+EXPORT_SYMBOL_GPL(dell_app_wmi_led_set);
+
+static int __init dell_micmute_led_init(void)
+{
+	memset(dell_mic_tokens, 0, sizeof(struct dell_bios_data_token) * 2);
+	dmi_walk(find_micmute_tokens, NULL);
+
+	return 0;
+}
+
+struct bios_args {
+	unsigned char length;
+	unsigned char result_code;
+	unsigned char device_id;
+	unsigned char command;
+	unsigned char on_time;
+	unsigned char off_time;
+};
+
+static int dell_led_perform_fn(u8 length,
+		u8 result_code,
+		u8 device_id,
+		u8 command,
+		u8 on_time,
+		u8 off_time)
+{
+	struct bios_args *bios_return;
+	u8 return_code;
+	union acpi_object *obj;
+	struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
+	struct acpi_buffer input;
+	acpi_status status;
+
+	struct bios_args args;
+	args.length = length;
+	args.result_code = result_code;
+	args.device_id = device_id;
+	args.command = command;
+	args.on_time = on_time;
+	args.off_time = off_time;
+
+	input.length = sizeof(struct bios_args);
+	input.pointer = &args;
+
+	status = wmi_evaluate_method(DELL_LED_BIOS_GUID,
+		1,
+		1,
+		&input,
+		&output);
+
+	if (ACPI_FAILURE(status))
+		return status;
+
+	obj = output.pointer;
+
+	if (!obj)
+		return -EINVAL;
+	else if (obj->type != ACPI_TYPE_BUFFER) {
+		kfree(obj);
+		return -EINVAL;
+	}
+
+	bios_return = ((struct bios_args *)obj->buffer.pointer);
+	return_code = bios_return->result_code;
+
+	kfree(obj);
+
+	return return_code;
+}
+
+static int led_on(void)
+{
+	return dell_led_perform_fn(3,	/* Length of command */
+		INTERFACE_ERROR,	/* Init to  INTERFACE_ERROR */
+		DEVICE_ID_PANEL_BACK,	/* Device ID */
+		CMD_LED_ON,		/* Command */
+		0,			/* not used */
+		0);			/* not used */
+}
+
+static int led_off(void)
+{
+	return dell_led_perform_fn(3,	/* Length of command */
+		INTERFACE_ERROR,	/* Init to  INTERFACE_ERROR */
+		DEVICE_ID_PANEL_BACK,	/* Device ID */
+		CMD_LED_OFF,		/* Command */
+		0,			/* not used */
+		0);			/* not used */
+}
+
+static int led_blink(unsigned char on_eighths,
+		unsigned char off_eighths)
+{
+	return dell_led_perform_fn(5,	/* Length of command */
+		INTERFACE_ERROR,	/* Init to  INTERFACE_ERROR */
+		DEVICE_ID_PANEL_BACK,	/* Device ID */
+		CMD_LED_BLINK,		/* Command */
+		on_eighths,		/* blink on in eigths of a second */
+		off_eighths);		/* blink off in eights of a second */
+}
+
+static void dell_led_set(struct led_classdev *led_cdev,
+		enum led_brightness value)
+{
+	if (value == LED_OFF)
+		led_off();
+	else
+		led_on();
+}
+
+static int dell_led_blink(struct led_classdev *led_cdev,
+		unsigned long *delay_on,
+		unsigned long *delay_off)
+{
+	unsigned long on_eighths;
+	unsigned long off_eighths;
+
+	/* The Dell LED delay is based on 125ms intervals.
+	   Need to round up to next interval. */
+
+	on_eighths = (*delay_on + 124) / 125;
+	if (0 == on_eighths)
+		on_eighths = 1;
+	if (on_eighths > 255)
+		on_eighths = 255;
+	*delay_on = on_eighths * 125;
+
+	off_eighths = (*delay_off + 124) / 125;
+	if (0 == off_eighths)
+		off_eighths = 1;
+	if (off_eighths > 255)
+		off_eighths = 255;
+	*delay_off = off_eighths * 125;
+
+	led_blink(on_eighths, off_eighths);
+
+	return 0;
+}
+
+static struct led_classdev dell_led = {
+	.name		= "dell::lid",
+	.brightness	= LED_OFF,
+	.max_brightness = 1,
+	.brightness_set = dell_led_set,
+	.blink_set	= dell_led_blink,
+	.flags		= LED_CORE_SUSPENDRESUME,
+};
+
+static int __init dell_led_init(void)
+{
+	int error = 0;
+
+	if (!wmi_has_guid(DELL_LED_BIOS_GUID) && !wmi_has_guid(DELL_APP_GUID))
+		return -ENODEV;
+
+	if (wmi_has_guid(DELL_APP_GUID))
+		error = dell_micmute_led_init();
+
+	if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
+		error = led_off();
+		if (error != 0)
+			return -ENODEV;
+
+		error = led_classdev_register(NULL, &dell_led);
+	}
+
+	return error;
+}
+
+static void __exit dell_led_exit(void)
+{
+	int error = 0;
+
+	if (wmi_has_guid(DELL_LED_BIOS_GUID)) {
+		error = led_off();
+		if (error == 0)
+			led_classdev_unregister(&dell_led);
+	}
+}
+
+module_init(dell_led_init);
+module_exit(dell_led_exit);

drivers/leds/led-class.c

@@ -0,0 +1,293 @@
+/*
+ * LED Class Core
+ *
+ * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
+ * Copyright (C) 2005-2007 Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/ctype.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/timer.h>
+#include "leds.h"
+
+static struct class *leds_class;
+
+static ssize_t brightness_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	/* no lock needed for this */
+	led_update_brightness(led_cdev);
+
+	return sprintf(buf, "%u\n", led_cdev->brightness);
+}
+
+static ssize_t brightness_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	unsigned long state;
+	ssize_t ret = -EINVAL;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	if (state == LED_OFF)
+		led_trigger_remove(led_cdev);
+	__led_set_brightness(led_cdev, state);
+
+	return size;
+}
+static DEVICE_ATTR_RW(brightness);
+
+static ssize_t max_brightness_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%u\n", led_cdev->max_brightness);
+}
+static DEVICE_ATTR_RO(max_brightness);
+
+#ifdef CONFIG_LEDS_TRIGGERS
+static DEVICE_ATTR(trigger, 0644, led_trigger_show, led_trigger_store);
+static struct attribute *led_trigger_attrs[] = {
+	&dev_attr_trigger.attr,
+	NULL,
+};
+static const struct attribute_group led_trigger_group = {
+	.attrs = led_trigger_attrs,
+};
+#endif
+
+static struct attribute *led_class_attrs[] = {
+	&dev_attr_brightness.attr,
+	&dev_attr_max_brightness.attr,
+	NULL,
+};
+
+static const struct attribute_group led_group = {
+	.attrs = led_class_attrs,
+};
+
+static const struct attribute_group *led_groups[] = {
+	&led_group,
+#ifdef CONFIG_LEDS_TRIGGERS
+	&led_trigger_group,
+#endif
+	NULL,
+};
+
+static void led_timer_function(unsigned long data)
+{
+	struct led_classdev *led_cdev = (void *)data;
+	unsigned long brightness;
+	unsigned long delay;
+
+	if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
+		__led_set_brightness(led_cdev, LED_OFF);
+		return;
+	}
+
+	if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) {
+		led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
+		return;
+	}
+
+	brightness = led_get_brightness(led_cdev);
+	if (!brightness) {
+		/* Time to switch the LED on. */
+		brightness = led_cdev->blink_brightness;
+		delay = led_cdev->blink_delay_on;
+	} else {
+		/* Store the current brightness value to be able
+		 * to restore it when the delay_off period is over.
+		 */
+		led_cdev->blink_brightness = brightness;
+		brightness = LED_OFF;
+		delay = led_cdev->blink_delay_off;
+	}
+
+	__led_set_brightness(led_cdev, brightness);
+
+	/* Return in next iteration if led is in one-shot mode and we are in
+	 * the final blink state so that the led is toggled each delay_on +
+	 * delay_off milliseconds in worst case.
+	 */
+	if (led_cdev->flags & LED_BLINK_ONESHOT) {
+		if (led_cdev->flags & LED_BLINK_INVERT) {
+			if (brightness)
+				led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
+		} else {
+			if (!brightness)
+				led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
+		}
+	}
+
+	mod_timer(&led_cdev->blink_timer, jiffies + msecs_to_jiffies(delay));
+}
+
+static void set_brightness_delayed(struct work_struct *ws)
+{
+	struct led_classdev *led_cdev =
+		container_of(ws, struct led_classdev, set_brightness_work);
+
+	led_stop_software_blink(led_cdev);
+
+	__led_set_brightness(led_cdev, led_cdev->delayed_set_value);
+}
+
+/**
+ * led_classdev_suspend - suspend an led_classdev.
+ * @led_cdev: the led_classdev to suspend.
+ */
+void led_classdev_suspend(struct led_classdev *led_cdev)
+{
+	led_cdev->flags |= LED_SUSPENDED;
+	led_cdev->brightness_set(led_cdev, 0);
+}
+EXPORT_SYMBOL_GPL(led_classdev_suspend);
+
+/**
+ * led_classdev_resume - resume an led_classdev.
+ * @led_cdev: the led_classdev to resume.
+ */
+void led_classdev_resume(struct led_classdev *led_cdev)
+{
+	led_cdev->brightness_set(led_cdev, led_cdev->brightness);
+	led_cdev->flags &= ~LED_SUSPENDED;
+}
+EXPORT_SYMBOL_GPL(led_classdev_resume);
+
+static int led_suspend(struct device *dev)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
+		led_classdev_suspend(led_cdev);
+
+	return 0;
+}
+
+static int led_resume(struct device *dev)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	if (led_cdev->flags & LED_CORE_SUSPENDRESUME)
+		led_classdev_resume(led_cdev);
+
+	return 0;
+}
+
+static const struct dev_pm_ops leds_class_dev_pm_ops = {
+	.suspend        = led_suspend,
+	.resume         = led_resume,
+};
+
+/**
+ * led_classdev_register - register a new object of led_classdev class.
+ * @parent: The device to register.
+ * @led_cdev: the led_classdev structure for this device.
+ */
+int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
+{
+	led_cdev->dev = device_create_with_groups(leds_class, parent, 0,
+					led_cdev, led_cdev->groups,
+					"%s", led_cdev->name);
+	if (IS_ERR(led_cdev->dev))
+		return PTR_ERR(led_cdev->dev);
+
+#ifdef CONFIG_LEDS_TRIGGERS
+	init_rwsem(&led_cdev->trigger_lock);
+#endif
+	/* add to the list of leds */
+	down_write(&leds_list_lock);
+	list_add_tail(&led_cdev->node, &leds_list);
+	up_write(&leds_list_lock);
+
+	if (!led_cdev->max_brightness)
+		led_cdev->max_brightness = LED_FULL;
+
+	led_update_brightness(led_cdev);
+
+	INIT_WORK(&led_cdev->set_brightness_work, set_brightness_delayed);
+
+	init_timer(&led_cdev->blink_timer);
+	led_cdev->blink_timer.function = led_timer_function;
+	led_cdev->blink_timer.data = (unsigned long)led_cdev;
+
+#ifdef CONFIG_LEDS_TRIGGERS
+	led_trigger_set_default(led_cdev);
+#endif
+
+	dev_dbg(parent, "Registered led device: %s\n",
+			led_cdev->name);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(led_classdev_register);
+
+/**
+ * led_classdev_unregister - unregisters a object of led_properties class.
+ * @led_cdev: the led device to unregister
+ *
+ * Unregisters a previously registered via led_classdev_register object.
+ */
+void led_classdev_unregister(struct led_classdev *led_cdev)
+{
+#ifdef CONFIG_LEDS_TRIGGERS
+	down_write(&led_cdev->trigger_lock);
+	if (led_cdev->trigger)
+		led_trigger_set(led_cdev, NULL);
+	up_write(&led_cdev->trigger_lock);
+#endif
+
+	cancel_work_sync(&led_cdev->set_brightness_work);
+
+	/* Stop blinking */
+	led_stop_software_blink(led_cdev);
+	led_set_brightness(led_cdev, LED_OFF);
+
+	device_unregister(led_cdev->dev);
+
+	down_write(&leds_list_lock);
+	list_del(&led_cdev->node);
+	up_write(&leds_list_lock);
+}
+EXPORT_SYMBOL_GPL(led_classdev_unregister);
+
+static int __init leds_init(void)
+{
+	leds_class = class_create(THIS_MODULE, "leds");
+	if (IS_ERR(leds_class))
+		return PTR_ERR(leds_class);
+	leds_class->pm = &leds_class_dev_pm_ops;
+	leds_class->dev_groups = led_groups;
+	return 0;
+}
+
+static void __exit leds_exit(void)
+{
+	class_destroy(leds_class);
+}
+
+subsys_initcall(leds_init);
+module_exit(leds_exit);
+
+MODULE_AUTHOR("John Lenz, Richard Purdie");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LED Class Interface");

drivers/leds/led-core.c

@@ -0,0 +1,145 @@
+/*
+ * LED Class Core
+ *
+ * Copyright 2005-2006 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/rwsem.h>
+#include "leds.h"
+
+DECLARE_RWSEM(leds_list_lock);
+EXPORT_SYMBOL_GPL(leds_list_lock);
+
+LIST_HEAD(leds_list);
+EXPORT_SYMBOL_GPL(leds_list);
+
+static void led_set_software_blink(struct led_classdev *led_cdev,
+				   unsigned long delay_on,
+				   unsigned long delay_off)
+{
+	int current_brightness;
+
+	current_brightness = led_get_brightness(led_cdev);
+	if (current_brightness)
+		led_cdev->blink_brightness = current_brightness;
+	if (!led_cdev->blink_brightness)
+		led_cdev->blink_brightness = led_cdev->max_brightness;
+
+	led_cdev->blink_delay_on = delay_on;
+	led_cdev->blink_delay_off = delay_off;
+
+	/* never on - just set to off */
+	if (!delay_on) {
+		__led_set_brightness(led_cdev, LED_OFF);
+		return;
+	}
+
+	/* never off - just set to brightness */
+	if (!delay_off) {
+		__led_set_brightness(led_cdev, led_cdev->blink_brightness);
+		return;
+	}
+
+	mod_timer(&led_cdev->blink_timer, jiffies + 1);
+}
+
+
+static void led_blink_setup(struct led_classdev *led_cdev,
+		     unsigned long *delay_on,
+		     unsigned long *delay_off)
+{
+	if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
+	    led_cdev->blink_set &&
+	    !led_cdev->blink_set(led_cdev, delay_on, delay_off))
+		return;
+
+	/* blink with 1 Hz as default if nothing specified */
+	if (!*delay_on && !*delay_off)
+		*delay_on = *delay_off = 500;
+
+	led_set_software_blink(led_cdev, *delay_on, *delay_off);
+}
+
+void led_blink_set(struct led_classdev *led_cdev,
+		   unsigned long *delay_on,
+		   unsigned long *delay_off)
+{
+	del_timer_sync(&led_cdev->blink_timer);
+
+	led_cdev->flags &= ~LED_BLINK_ONESHOT;
+	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
+
+	led_blink_setup(led_cdev, delay_on, delay_off);
+}
+EXPORT_SYMBOL(led_blink_set);
+
+void led_blink_set_oneshot(struct led_classdev *led_cdev,
+			   unsigned long *delay_on,
+			   unsigned long *delay_off,
+			   int invert)
+{
+	if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
+	     timer_pending(&led_cdev->blink_timer))
+		return;
+
+	led_cdev->flags |= LED_BLINK_ONESHOT;
+	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
+
+	if (invert)
+		led_cdev->flags |= LED_BLINK_INVERT;
+	else
+		led_cdev->flags &= ~LED_BLINK_INVERT;
+
+	led_blink_setup(led_cdev, delay_on, delay_off);
+}
+EXPORT_SYMBOL(led_blink_set_oneshot);
+
+void led_stop_software_blink(struct led_classdev *led_cdev)
+{
+	del_timer_sync(&led_cdev->blink_timer);
+	led_cdev->blink_delay_on = 0;
+	led_cdev->blink_delay_off = 0;
+}
+EXPORT_SYMBOL_GPL(led_stop_software_blink);
+
+void led_set_brightness(struct led_classdev *led_cdev,
+			enum led_brightness brightness)
+{
+	/* delay brightness setting if need to stop soft-blink timer */
+	if (led_cdev->blink_delay_on || led_cdev->blink_delay_off) {
+		led_cdev->delayed_set_value = brightness;
+		schedule_work(&led_cdev->set_brightness_work);
+		return;
+	}
+
+	__led_set_brightness(led_cdev, brightness);
+}
+EXPORT_SYMBOL(led_set_brightness);
+
+int led_update_brightness(struct led_classdev *led_cdev)
+{
+	int ret = 0;
+
+	if (led_cdev->brightness_get) {
+		ret = led_cdev->brightness_get(led_cdev);
+		if (ret >= 0) {
+			led_cdev->brightness = ret;
+			return 0;
+		}
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(led_update_brightness);

drivers/leds/led-triggers.c

@@ -0,0 +1,332 @@
+/*
+ * LED Triggers Core
+ *
+ * Copyright 2005-2007 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/device.h>
+#include <linux/timer.h>
+#include <linux/rwsem.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include "leds.h"
+
+/*
+ * Nests outside led_cdev->trigger_lock
+ */
+static DECLARE_RWSEM(triggers_list_lock);
+static LIST_HEAD(trigger_list);
+
+ /* Used by LED Class */
+
+ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	char trigger_name[TRIG_NAME_MAX];
+	struct led_trigger *trig;
+	size_t len;
+
+	trigger_name[sizeof(trigger_name) - 1] = '\0';
+	strncpy(trigger_name, buf, sizeof(trigger_name) - 1);
+	len = strlen(trigger_name);
+
+	if (len && trigger_name[len - 1] == '\n')
+		trigger_name[len - 1] = '\0';
+
+	if (!strcmp(trigger_name, "none")) {
+		led_trigger_remove(led_cdev);
+		return count;
+	}
+
+	down_read(&triggers_list_lock);
+	list_for_each_entry(trig, &trigger_list, next_trig) {
+		if (!strcmp(trigger_name, trig->name)) {
+			down_write(&led_cdev->trigger_lock);
+			led_trigger_set(led_cdev, trig);
+			up_write(&led_cdev->trigger_lock);
+
+			up_read(&triggers_list_lock);
+			return count;
+		}
+	}
+	up_read(&triggers_list_lock);
+
+	return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(led_trigger_store);
+
+ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
+		char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct led_trigger *trig;
+	int len = 0;
+
+	down_read(&triggers_list_lock);
+	down_read(&led_cdev->trigger_lock);
+
+	if (!led_cdev->trigger)
+		len += sprintf(buf+len, "[none] ");
+	else
+		len += sprintf(buf+len, "none ");
+
+	list_for_each_entry(trig, &trigger_list, next_trig) {
+		if (led_cdev->trigger && !strcmp(led_cdev->trigger->name,
+							trig->name))
+			len += sprintf(buf+len, "[%s] ", trig->name);
+		else
+			len += sprintf(buf+len, "%s ", trig->name);
+	}
+	up_read(&led_cdev->trigger_lock);
+	up_read(&triggers_list_lock);
+
+	len += sprintf(len+buf, "\n");
+	return len;
+}
+EXPORT_SYMBOL_GPL(led_trigger_show);
+
+/* Caller must ensure led_cdev->trigger_lock held */
+void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
+{
+	unsigned long flags;
+	char *event = NULL;
+	char *envp[2];
+	const char *name;
+
+	name = trig ? trig->name : "none";
+	event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);
+
+	/* Remove any existing trigger */
+	if (led_cdev->trigger) {
+		write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
+		list_del(&led_cdev->trig_list);
+		write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock,
+			flags);
+		cancel_work_sync(&led_cdev->set_brightness_work);
+		led_stop_software_blink(led_cdev);
+		if (led_cdev->trigger->deactivate)
+			led_cdev->trigger->deactivate(led_cdev);
+		led_cdev->trigger = NULL;
+		led_set_brightness(led_cdev, LED_OFF);
+	}
+	if (trig) {
+		write_lock_irqsave(&trig->leddev_list_lock, flags);
+		list_add_tail(&led_cdev->trig_list, &trig->led_cdevs);
+		write_unlock_irqrestore(&trig->leddev_list_lock, flags);
+		led_cdev->trigger = trig;
+		if (trig->activate)
+			trig->activate(led_cdev);
+	}
+
+	if (event) {
+		envp[0] = event;
+		envp[1] = NULL;
+		kobject_uevent_env(&led_cdev->dev->kobj, KOBJ_CHANGE, envp);
+		kfree(event);
+	}
+}
+EXPORT_SYMBOL_GPL(led_trigger_set);
+
+void led_trigger_remove(struct led_classdev *led_cdev)
+{
+	down_write(&led_cdev->trigger_lock);
+	led_trigger_set(led_cdev, NULL);
+	up_write(&led_cdev->trigger_lock);
+}
+EXPORT_SYMBOL_GPL(led_trigger_remove);
+
+void led_trigger_set_default(struct led_classdev *led_cdev)
+{
+	struct led_trigger *trig;
+
+	if (!led_cdev->default_trigger)
+		return;
+
+	down_read(&triggers_list_lock);
+	down_write(&led_cdev->trigger_lock);
+	list_for_each_entry(trig, &trigger_list, next_trig) {
+		if (!strcmp(led_cdev->default_trigger, trig->name))
+			led_trigger_set(led_cdev, trig);
+	}
+	up_write(&led_cdev->trigger_lock);
+	up_read(&triggers_list_lock);
+}
+EXPORT_SYMBOL_GPL(led_trigger_set_default);
+
+void led_trigger_rename_static(const char *name, struct led_trigger *trig)
+{
+	/* new name must be on a temporary string to prevent races */
+	BUG_ON(name == trig->name);
+
+	down_write(&triggers_list_lock);
+	/* this assumes that trig->name was originaly allocated to
+	 * non constant storage */
+	strcpy((char *)trig->name, name);
+	up_write(&triggers_list_lock);
+}
+EXPORT_SYMBOL_GPL(led_trigger_rename_static);
+
+/* LED Trigger Interface */
+
+int led_trigger_register(struct led_trigger *trig)
+{
+	struct led_classdev *led_cdev;
+	struct led_trigger *_trig;
+
+	rwlock_init(&trig->leddev_list_lock);
+	INIT_LIST_HEAD(&trig->led_cdevs);
+
+	down_write(&triggers_list_lock);
+	/* Make sure the trigger's name isn't already in use */
+	list_for_each_entry(_trig, &trigger_list, next_trig) {
+		if (!strcmp(_trig->name, trig->name)) {
+			up_write(&triggers_list_lock);
+			return -EEXIST;
+		}
+	}
+	/* Add to the list of led triggers */
+	list_add_tail(&trig->next_trig, &trigger_list);
+	up_write(&triggers_list_lock);
+
+	/* Register with any LEDs that have this as a default trigger */
+	down_read(&leds_list_lock);
+	list_for_each_entry(led_cdev, &leds_list, node) {
+		down_write(&led_cdev->trigger_lock);
+		if (!led_cdev->trigger && led_cdev->default_trigger &&
+			    !strcmp(led_cdev->default_trigger, trig->name))
+			led_trigger_set(led_cdev, trig);
+		up_write(&led_cdev->trigger_lock);
+	}
+	up_read(&leds_list_lock);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(led_trigger_register);
+
+void led_trigger_unregister(struct led_trigger *trig)
+{
+	struct led_classdev *led_cdev;
+
+	if (list_empty_careful(&trig->next_trig))
+		return;
+
+	/* Remove from the list of led triggers */
+	down_write(&triggers_list_lock);
+	list_del_init(&trig->next_trig);
+	up_write(&triggers_list_lock);
+
+	/* Remove anyone actively using this trigger */
+	down_read(&leds_list_lock);
+	list_for_each_entry(led_cdev, &leds_list, node) {
+		down_write(&led_cdev->trigger_lock);
+		if (led_cdev->trigger == trig)
+			led_trigger_set(led_cdev, NULL);
+		up_write(&led_cdev->trigger_lock);
+	}
+	up_read(&leds_list_lock);
+}
+EXPORT_SYMBOL_GPL(led_trigger_unregister);
+
+/* Simple LED Tigger Interface */
+
+void led_trigger_event(struct led_trigger *trig,
+			enum led_brightness brightness)
+{
+	struct led_classdev *led_cdev;
+
+	if (!trig)
+		return;
+
+	read_lock(&trig->leddev_list_lock);
+	list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list)
+		led_set_brightness(led_cdev, brightness);
+	read_unlock(&trig->leddev_list_lock);
+}
+EXPORT_SYMBOL_GPL(led_trigger_event);
+
+static void led_trigger_blink_setup(struct led_trigger *trig,
+			     unsigned long *delay_on,
+			     unsigned long *delay_off,
+			     int oneshot,
+			     int invert)
+{
+	struct led_classdev *led_cdev;
+
+	if (!trig)
+		return;
+
+	read_lock(&trig->leddev_list_lock);
+	list_for_each_entry(led_cdev, &trig->led_cdevs, trig_list) {
+		if (oneshot)
+			led_blink_set_oneshot(led_cdev, delay_on, delay_off,
+					      invert);
+		else
+			led_blink_set(led_cdev, delay_on, delay_off);
+	}
+	read_unlock(&trig->leddev_list_lock);
+}
+
+void led_trigger_blink(struct led_trigger *trig,
+		       unsigned long *delay_on,
+		       unsigned long *delay_off)
+{
+	led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0);
+}
+EXPORT_SYMBOL_GPL(led_trigger_blink);
+
+void led_trigger_blink_oneshot(struct led_trigger *trig,
+			       unsigned long *delay_on,
+			       unsigned long *delay_off,
+			       int invert)
+{
+	led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert);
+}
+EXPORT_SYMBOL_GPL(led_trigger_blink_oneshot);
+
+void led_trigger_register_simple(const char *name, struct led_trigger **tp)
+{
+	struct led_trigger *trig;
+	int err;
+
+	trig = kzalloc(sizeof(struct led_trigger), GFP_KERNEL);
+
+	if (trig) {
+		trig->name = name;
+		err = led_trigger_register(trig);
+		if (err < 0) {
+			kfree(trig);
+			trig = NULL;
+			pr_warn("LED trigger %s failed to register (%d)\n",
+				name, err);
+		}
+	} else {
+		pr_warn("LED trigger %s failed to register (no memory)\n",
+			name);
+	}
+	*tp = trig;
+}
+EXPORT_SYMBOL_GPL(led_trigger_register_simple);
+
+void led_trigger_unregister_simple(struct led_trigger *trig)
+{
+	if (trig)
+		led_trigger_unregister(trig);
+	kfree(trig);
+}
+EXPORT_SYMBOL_GPL(led_trigger_unregister_simple);
+
+MODULE_AUTHOR("Richard Purdie");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("LED Triggers Core");

drivers/leds/leds-88pm860x.c

@@ -0,0 +1,251 @@
+/*
+ * LED driver for Marvell 88PM860x
+ *
+ * Copyright (C) 2009 Marvell International Ltd.
+ *	Haojian Zhuang <haojian.zhuang@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/88pm860x.h>
+#include <linux/module.h>
+
+#define LED_PWM_MASK		(0x1F)
+#define LED_CURRENT_MASK	(0x07 << 5)
+
+#define LED_BLINK_MASK		(0x7F)
+
+#define LED_ON_CONTINUOUS	(0x0F << 3)
+
+#define LED1_BLINK_EN		(1 << 1)
+#define LED2_BLINK_EN		(1 << 2)
+
+struct pm860x_led {
+	struct led_classdev cdev;
+	struct i2c_client *i2c;
+	struct work_struct work;
+	struct pm860x_chip *chip;
+	struct mutex lock;
+	char name[MFD_NAME_SIZE];
+
+	int port;
+	int iset;
+	unsigned char brightness;
+	unsigned char current_brightness;
+
+	int reg_control;
+	int reg_blink;
+	int blink_mask;
+};
+
+static int led_power_set(struct pm860x_chip *chip, int port, int on)
+{
+	int ret = -EINVAL;
+
+	switch (port) {
+	case 0:
+	case 1:
+	case 2:
+		ret = on ? pm8606_osc_enable(chip, RGB1_ENABLE) :
+			pm8606_osc_disable(chip, RGB1_ENABLE);
+		break;
+	case 3:
+	case 4:
+	case 5:
+		ret = on ? pm8606_osc_enable(chip, RGB2_ENABLE) :
+			pm8606_osc_disable(chip, RGB2_ENABLE);
+		break;
+	}
+	return ret;
+}
+
+static void pm860x_led_work(struct work_struct *work)
+{
+
+	struct pm860x_led *led;
+	struct pm860x_chip *chip;
+	unsigned char buf[3];
+	int ret;
+
+	led = container_of(work, struct pm860x_led, work);
+	chip = led->chip;
+	mutex_lock(&led->lock);
+	if ((led->current_brightness == 0) && led->brightness) {
+		led_power_set(chip, led->port, 1);
+		if (led->iset) {
+			pm860x_set_bits(led->i2c, led->reg_control,
+					LED_CURRENT_MASK, led->iset);
+		}
+		pm860x_set_bits(led->i2c, led->reg_blink,
+				LED_BLINK_MASK, LED_ON_CONTINUOUS);
+		pm860x_set_bits(led->i2c, PM8606_WLED3B, led->blink_mask,
+				led->blink_mask);
+	}
+	pm860x_set_bits(led->i2c, led->reg_control, LED_PWM_MASK,
+			led->brightness);
+
+	if (led->brightness == 0) {
+		pm860x_bulk_read(led->i2c, led->reg_control, 3, buf);
+		ret = buf[0] & LED_PWM_MASK;
+		ret |= buf[1] & LED_PWM_MASK;
+		ret |= buf[2] & LED_PWM_MASK;
+		if (ret == 0) {
+			/* unset current since no led is lighting */
+			pm860x_set_bits(led->i2c, led->reg_control,
+					LED_CURRENT_MASK, 0);
+			pm860x_set_bits(led->i2c, PM8606_WLED3B,
+					led->blink_mask, 0);
+			led_power_set(chip, led->port, 0);
+		}
+	}
+	led->current_brightness = led->brightness;
+	dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
+		led->reg_control, led->brightness);
+	mutex_unlock(&led->lock);
+}
+
+static void pm860x_led_set(struct led_classdev *cdev,
+			   enum led_brightness value)
+{
+	struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
+
+	data->brightness = value >> 3;
+	schedule_work(&data->work);
+}
+
+#ifdef CONFIG_OF
+static int pm860x_led_dt_init(struct platform_device *pdev,
+			      struct pm860x_led *data)
+{
+	struct device_node *nproot, *np;
+	int iset = 0;
+
+	if (!pdev->dev.parent->of_node)
+		return -ENODEV;
+	nproot = of_get_child_by_name(pdev->dev.parent->of_node, "leds");
+	if (!nproot) {
+		dev_err(&pdev->dev, "failed to find leds node\n");
+		return -ENODEV;
+	}
+	for_each_child_of_node(nproot, np) {
+		if (!of_node_cmp(np->name, data->name)) {
+			of_property_read_u32(np, "marvell,88pm860x-iset",
+					     &iset);
+			data->iset = PM8606_LED_CURRENT(iset);
+			break;
+		}
+	}
+	of_node_put(nproot);
+	return 0;
+}
+#else
+#define pm860x_led_dt_init(x, y)	(-1)
+#endif
+
+static int pm860x_led_probe(struct platform_device *pdev)
+{
+	struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
+	struct pm860x_led_pdata *pdata = dev_get_platdata(&pdev->dev);
+	struct pm860x_led *data;
+	struct resource *res;
+	int ret = 0;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(struct pm860x_led), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "control");
+	if (!res) {
+		dev_err(&pdev->dev, "No REG resource for control\n");
+		return -ENXIO;
+	}
+	data->reg_control = res->start;
+	res = platform_get_resource_byname(pdev, IORESOURCE_REG, "blink");
+	if (!res) {
+		dev_err(&pdev->dev, "No REG resource for blink\n");
+		return -ENXIO;
+	}
+	data->reg_blink = res->start;
+	memset(data->name, 0, MFD_NAME_SIZE);
+	switch (pdev->id) {
+	case 0:
+		data->blink_mask = LED1_BLINK_EN;
+		sprintf(data->name, "led0-red");
+		break;
+	case 1:
+		data->blink_mask = LED1_BLINK_EN;
+		sprintf(data->name, "led0-green");
+		break;
+	case 2:
+		data->blink_mask = LED1_BLINK_EN;
+		sprintf(data->name, "led0-blue");
+		break;
+	case 3:
+		data->blink_mask = LED2_BLINK_EN;
+		sprintf(data->name, "led1-red");
+		break;
+	case 4:
+		data->blink_mask = LED2_BLINK_EN;
+		sprintf(data->name, "led1-green");
+		break;
+	case 5:
+		data->blink_mask = LED2_BLINK_EN;
+		sprintf(data->name, "led1-blue");
+		break;
+	}
+	platform_set_drvdata(pdev, data);
+	data->chip = chip;
+	data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
+	data->port = pdev->id;
+	if (pm860x_led_dt_init(pdev, data))
+		if (pdata)
+			data->iset = pdata->iset;
+
+	data->current_brightness = 0;
+	data->cdev.name = data->name;
+	data->cdev.brightness_set = pm860x_led_set;
+	mutex_init(&data->lock);
+	INIT_WORK(&data->work, pm860x_led_work);
+
+	ret = led_classdev_register(chip->dev, &data->cdev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
+		return ret;
+	}
+	pm860x_led_set(&data->cdev, 0);
+	return 0;
+}
+
+static int pm860x_led_remove(struct platform_device *pdev)
+{
+	struct pm860x_led *data = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&data->cdev);
+
+	return 0;
+}
+
+static struct platform_driver pm860x_led_driver = {
+	.driver	= {
+		.name	= "88pm860x-led",
+		.owner	= THIS_MODULE,
+	},
+	.probe	= pm860x_led_probe,
+	.remove	= pm860x_led_remove,
+};
+
+module_platform_driver(pm860x_led_driver);
+
+MODULE_DESCRIPTION("LED driver for Marvell PM860x");
+MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:88pm860x-led");

drivers/leds/leds-adp5520.c

@@ -0,0 +1,215 @@
+/*
+ * LEDs driver for Analog Devices ADP5520/ADP5501 MFD PMICs
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Loosely derived from leds-da903x:
+ * Copyright (C) 2008 Compulab, Ltd.
+ *	Mike Rapoport <mike@compulab.co.il>
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ *	Eric Miao <eric.miao@marvell.com>
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/adp5520.h>
+#include <linux/slab.h>
+
+struct adp5520_led {
+	struct led_classdev	cdev;
+	struct work_struct	work;
+	struct device		*master;
+	enum led_brightness	new_brightness;
+	int			id;
+	int			flags;
+};
+
+static void adp5520_led_work(struct work_struct *work)
+{
+	struct adp5520_led *led = container_of(work, struct adp5520_led, work);
+	adp5520_write(led->master, ADP5520_LED1_CURRENT + led->id - 1,
+			 led->new_brightness >> 2);
+}
+
+static void adp5520_led_set(struct led_classdev *led_cdev,
+			   enum led_brightness value)
+{
+	struct adp5520_led *led;
+
+	led = container_of(led_cdev, struct adp5520_led, cdev);
+	led->new_brightness = value;
+	schedule_work(&led->work);
+}
+
+static int adp5520_led_setup(struct adp5520_led *led)
+{
+	struct device *dev = led->master;
+	int flags = led->flags;
+	int ret = 0;
+
+	switch (led->id) {
+	case FLAG_ID_ADP5520_LED1_ADP5501_LED0:
+		ret |= adp5520_set_bits(dev, ADP5520_LED_TIME,
+					(flags >> ADP5520_FLAG_OFFT_SHIFT) &
+					ADP5520_FLAG_OFFT_MASK);
+		ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
+					ADP5520_LED1_EN);
+		break;
+	case FLAG_ID_ADP5520_LED2_ADP5501_LED1:
+		ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
+					((flags >> ADP5520_FLAG_OFFT_SHIFT) &
+					ADP5520_FLAG_OFFT_MASK) << 2);
+		ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
+					 ADP5520_R3_MODE);
+		ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
+					ADP5520_LED2_EN);
+		break;
+	case FLAG_ID_ADP5520_LED3_ADP5501_LED2:
+		ret |= adp5520_set_bits(dev,  ADP5520_LED_TIME,
+					((flags >> ADP5520_FLAG_OFFT_SHIFT) &
+					ADP5520_FLAG_OFFT_MASK) << 4);
+		ret |= adp5520_clr_bits(dev, ADP5520_LED_CONTROL,
+					ADP5520_C3_MODE);
+		ret |= adp5520_set_bits(dev, ADP5520_LED_CONTROL,
+					ADP5520_LED3_EN);
+		break;
+	}
+
+	return ret;
+}
+
+static int adp5520_led_prepare(struct platform_device *pdev)
+{
+	struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct device *dev = pdev->dev.parent;
+	int ret = 0;
+
+	ret |= adp5520_write(dev, ADP5520_LED1_CURRENT, 0);
+	ret |= adp5520_write(dev, ADP5520_LED2_CURRENT, 0);
+	ret |= adp5520_write(dev, ADP5520_LED3_CURRENT, 0);
+	ret |= adp5520_write(dev, ADP5520_LED_TIME, pdata->led_on_time << 6);
+	ret |= adp5520_write(dev, ADP5520_LED_FADE, FADE_VAL(pdata->fade_in,
+		 pdata->fade_out));
+
+	return ret;
+}
+
+static int adp5520_led_probe(struct platform_device *pdev)
+{
+	struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct adp5520_led *led, *led_dat;
+	struct led_info *cur_led;
+	int ret, i;
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "missing platform data\n");
+		return -ENODEV;
+	}
+
+	if (pdata->num_leds > ADP5520_01_MAXLEDS) {
+		dev_err(&pdev->dev, "can't handle more than %d LEDS\n",
+				 ADP5520_01_MAXLEDS);
+		return -EFAULT;
+	}
+
+	led = devm_kzalloc(&pdev->dev, sizeof(*led) * pdata->num_leds,
+				GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	ret = adp5520_led_prepare(pdev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to write\n");
+		return ret;
+	}
+
+	for (i = 0; i < pdata->num_leds; ++i) {
+		cur_led = &pdata->leds[i];
+		led_dat = &led[i];
+
+		led_dat->cdev.name = cur_led->name;
+		led_dat->cdev.default_trigger = cur_led->default_trigger;
+		led_dat->cdev.brightness_set = adp5520_led_set;
+		led_dat->cdev.brightness = LED_OFF;
+
+		if (cur_led->flags & ADP5520_FLAG_LED_MASK)
+			led_dat->flags = cur_led->flags;
+		else
+			led_dat->flags = i + 1;
+
+		led_dat->id = led_dat->flags & ADP5520_FLAG_LED_MASK;
+
+		led_dat->master = pdev->dev.parent;
+		led_dat->new_brightness = LED_OFF;
+
+		INIT_WORK(&led_dat->work, adp5520_led_work);
+
+		ret = led_classdev_register(led_dat->master, &led_dat->cdev);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to register LED %d\n",
+				led_dat->id);
+			goto err;
+		}
+
+		ret = adp5520_led_setup(led_dat);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to write\n");
+			i++;
+			goto err;
+		}
+	}
+
+	platform_set_drvdata(pdev, led);
+	return 0;
+
+err:
+	if (i > 0) {
+		for (i = i - 1; i >= 0; i--) {
+			led_classdev_unregister(&led[i].cdev);
+			cancel_work_sync(&led[i].work);
+		}
+	}
+
+	return ret;
+}
+
+static int adp5520_led_remove(struct platform_device *pdev)
+{
+	struct adp5520_leds_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct adp5520_led *led;
+	int i;
+
+	led = platform_get_drvdata(pdev);
+
+	adp5520_clr_bits(led->master, ADP5520_LED_CONTROL,
+		 ADP5520_LED1_EN | ADP5520_LED2_EN | ADP5520_LED3_EN);
+
+	for (i = 0; i < pdata->num_leds; i++) {
+		led_classdev_unregister(&led[i].cdev);
+		cancel_work_sync(&led[i].work);
+	}
+
+	return 0;
+}
+
+static struct platform_driver adp5520_led_driver = {
+	.driver	= {
+		.name	= "adp5520-led",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= adp5520_led_probe,
+	.remove		= adp5520_led_remove,
+};
+
+module_platform_driver(adp5520_led_driver);
+
+MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
+MODULE_DESCRIPTION("LEDS ADP5520(01) Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:adp5520-led");

drivers/leds/leds-asic3.c

@@ -0,0 +1,181 @@
+/*
+ *  Copyright (C) 2011 Paul Parsons <lost.distance@yahoo.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/asic3.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+
+/*
+ *	The HTC ASIC3 LED GPIOs are inputs, not outputs.
+ *	Hence we turn the LEDs on/off via the TimeBase register.
+ */
+
+/*
+ *	When TimeBase is 4 the clock resolution is about 32Hz.
+ *	This driver supports hardware blinking with an on+off
+ *	period from 62ms (2 clocks) to 125s (4000 clocks).
+ */
+#define MS_TO_CLK(ms)	DIV_ROUND_CLOSEST(((ms)*1024), 32000)
+#define CLK_TO_MS(clk)	(((clk)*32000)/1024)
+#define MAX_CLK		4000            /* Fits into 12-bit Time registers */
+#define MAX_MS		CLK_TO_MS(MAX_CLK)
+
+static const unsigned int led_n_base[ASIC3_NUM_LEDS] = {
+	[0] = ASIC3_LED_0_Base,
+	[1] = ASIC3_LED_1_Base,
+	[2] = ASIC3_LED_2_Base,
+};
+
+static void brightness_set(struct led_classdev *cdev,
+	enum led_brightness value)
+{
+	struct platform_device *pdev = to_platform_device(cdev->dev->parent);
+	const struct mfd_cell *cell = mfd_get_cell(pdev);
+	struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
+	u32 timebase;
+	unsigned int base;
+
+	timebase = (value == LED_OFF) ? 0 : (LED_EN|0x4);
+
+	base = led_n_base[cell->id];
+	asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), 32);
+	asic3_write_register(asic, (base + ASIC3_LED_DutyTime), 32);
+	asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
+	asic3_write_register(asic, (base + ASIC3_LED_TimeBase), timebase);
+}
+
+static int blink_set(struct led_classdev *cdev,
+	unsigned long *delay_on,
+	unsigned long *delay_off)
+{
+	struct platform_device *pdev = to_platform_device(cdev->dev->parent);
+	const struct mfd_cell *cell = mfd_get_cell(pdev);
+	struct asic3 *asic = dev_get_drvdata(pdev->dev.parent);
+	u32 on;
+	u32 off;
+	unsigned int base;
+
+	if (*delay_on > MAX_MS || *delay_off > MAX_MS)
+		return -EINVAL;
+
+	if (*delay_on == 0 && *delay_off == 0) {
+		/* If both are zero then a sensible default should be chosen */
+		on = MS_TO_CLK(500);
+		off = MS_TO_CLK(500);
+	} else {
+		on = MS_TO_CLK(*delay_on);
+		off = MS_TO_CLK(*delay_off);
+		if ((on + off) > MAX_CLK)
+			return -EINVAL;
+	}
+
+	base = led_n_base[cell->id];
+	asic3_write_register(asic, (base + ASIC3_LED_PeriodTime), (on + off));
+	asic3_write_register(asic, (base + ASIC3_LED_DutyTime), on);
+	asic3_write_register(asic, (base + ASIC3_LED_AutoStopCount), 0);
+	asic3_write_register(asic, (base + ASIC3_LED_TimeBase), (LED_EN|0x4));
+
+	*delay_on = CLK_TO_MS(on);
+	*delay_off = CLK_TO_MS(off);
+
+	return 0;
+}
+
+static int asic3_led_probe(struct platform_device *pdev)
+{
+	struct asic3_led *led = dev_get_platdata(&pdev->dev);
+	int ret;
+
+	ret = mfd_cell_enable(pdev);
+	if (ret < 0)
+		return ret;
+
+	led->cdev = devm_kzalloc(&pdev->dev, sizeof(struct led_classdev),
+				GFP_KERNEL);
+	if (!led->cdev) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	led->cdev->name = led->name;
+	led->cdev->flags = LED_CORE_SUSPENDRESUME;
+	led->cdev->brightness_set = brightness_set;
+	led->cdev->blink_set = blink_set;
+	led->cdev->default_trigger = led->default_trigger;
+
+	ret = led_classdev_register(&pdev->dev, led->cdev);
+	if (ret < 0)
+		goto out;
+
+	return 0;
+
+out:
+	(void) mfd_cell_disable(pdev);
+	return ret;
+}
+
+static int asic3_led_remove(struct platform_device *pdev)
+{
+	struct asic3_led *led = dev_get_platdata(&pdev->dev);
+
+	led_classdev_unregister(led->cdev);
+
+	return mfd_cell_disable(pdev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int asic3_led_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	const struct mfd_cell *cell = mfd_get_cell(pdev);
+	int ret;
+
+	ret = 0;
+	if (cell->suspend)
+		ret = (*cell->suspend)(pdev);
+
+	return ret;
+}
+
+static int asic3_led_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	const struct mfd_cell *cell = mfd_get_cell(pdev);
+	int ret;
+
+	ret = 0;
+	if (cell->resume)
+		ret = (*cell->resume)(pdev);
+
+	return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(asic3_led_pm_ops, asic3_led_suspend, asic3_led_resume);
+
+static struct platform_driver asic3_led_driver = {
+	.probe		= asic3_led_probe,
+	.remove		= asic3_led_remove,
+	.driver		= {
+		.name	= "leds-asic3",
+		.owner	= THIS_MODULE,
+		.pm	= &asic3_led_pm_ops,
+	},
+};
+
+module_platform_driver(asic3_led_driver);
+
+MODULE_AUTHOR("Paul Parsons <lost.distance@yahoo.com>");
+MODULE_DESCRIPTION("HTC ASIC3 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-asic3");

drivers/leds/leds-bd2802.c

@@ -0,0 +1,809 @@
+/*
+ * leds-bd2802.c - RGB LED Driver
+ *
+ * Copyright (C) 2009 Samsung Electronics
+ * Kim Kyuwon <q1.kim@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Datasheet: http://www.rohm.com/products/databook/driver/pdf/bd2802gu-e.pdf
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/leds.h>
+#include <linux/leds-bd2802.h>
+#include <linux/slab.h>
+#include <linux/pm.h>
+
+#define LED_CTL(rgb2en, rgb1en) ((rgb2en) << 4 | ((rgb1en) << 0))
+
+#define BD2802_LED_OFFSET		0xa
+#define BD2802_COLOR_OFFSET		0x3
+
+#define BD2802_REG_CLKSETUP		0x00
+#define BD2802_REG_CONTROL		0x01
+#define BD2802_REG_HOURSETUP		0x02
+#define BD2802_REG_CURRENT1SETUP	0x03
+#define BD2802_REG_CURRENT2SETUP	0x04
+#define BD2802_REG_WAVEPATTERN		0x05
+
+#define BD2802_CURRENT_032		0x10 /* 3.2mA */
+#define BD2802_CURRENT_000		0x00 /* 0.0mA */
+
+#define BD2802_PATTERN_FULL		0x07
+#define BD2802_PATTERN_HALF		0x03
+
+enum led_ids {
+	LED1,
+	LED2,
+	LED_NUM,
+};
+
+enum led_colors {
+	RED,
+	GREEN,
+	BLUE,
+};
+
+enum led_bits {
+	BD2802_OFF,
+	BD2802_BLINK,
+	BD2802_ON,
+};
+
+/*
+ * State '0' : 'off'
+ * State '1' : 'blink'
+ * State '2' : 'on'.
+ */
+struct led_state {
+	unsigned r:2;
+	unsigned g:2;
+	unsigned b:2;
+};
+
+struct bd2802_led {
+	struct bd2802_led_platform_data	*pdata;
+	struct i2c_client		*client;
+	struct rw_semaphore		rwsem;
+	struct work_struct		work;
+
+	struct led_state		led[2];
+
+	/*
+	 * Making led_classdev as array is not recommended, because array
+	 * members prevent using 'container_of' macro. So repetitive works
+	 * are needed.
+	 */
+	struct led_classdev		cdev_led1r;
+	struct led_classdev		cdev_led1g;
+	struct led_classdev		cdev_led1b;
+	struct led_classdev		cdev_led2r;
+	struct led_classdev		cdev_led2g;
+	struct led_classdev		cdev_led2b;
+
+	/*
+	 * Advanced Configuration Function(ADF) mode:
+	 * In ADF mode, user can set registers of BD2802GU directly,
+	 * therefore BD2802GU doesn't enter reset state.
+	 */
+	int				adf_on;
+
+	enum led_ids			led_id;
+	enum led_colors			color;
+	enum led_bits			state;
+
+	/* General attributes of RGB LEDs */
+	int				wave_pattern;
+	int				rgb_current;
+};
+
+
+/*--------------------------------------------------------------*/
+/*	BD2802GU helper functions					*/
+/*--------------------------------------------------------------*/
+
+static inline int bd2802_is_rgb_off(struct bd2802_led *led, enum led_ids id,
+							enum led_colors color)
+{
+	switch (color) {
+	case RED:
+		return !led->led[id].r;
+	case GREEN:
+		return !led->led[id].g;
+	case BLUE:
+		return !led->led[id].b;
+	default:
+		dev_err(&led->client->dev, "%s: Invalid color\n", __func__);
+		return -EINVAL;
+	}
+}
+
+static inline int bd2802_is_led_off(struct bd2802_led *led, enum led_ids id)
+{
+	if (led->led[id].r || led->led[id].g || led->led[id].b)
+		return 0;
+
+	return 1;
+}
+
+static inline int bd2802_is_all_off(struct bd2802_led *led)
+{
+	int i;
+
+	for (i = 0; i < LED_NUM; i++)
+		if (!bd2802_is_led_off(led, i))
+			return 0;
+
+	return 1;
+}
+
+static inline u8 bd2802_get_base_offset(enum led_ids id, enum led_colors color)
+{
+	return id * BD2802_LED_OFFSET + color * BD2802_COLOR_OFFSET;
+}
+
+static inline u8 bd2802_get_reg_addr(enum led_ids id, enum led_colors color,
+								u8 reg_offset)
+{
+	return reg_offset + bd2802_get_base_offset(id, color);
+}
+
+
+/*--------------------------------------------------------------*/
+/*	BD2802GU core functions					*/
+/*--------------------------------------------------------------*/
+
+static int bd2802_write_byte(struct i2c_client *client, u8 reg, u8 val)
+{
+	int ret = i2c_smbus_write_byte_data(client, reg, val);
+	if (ret >= 0)
+		return 0;
+
+	dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
+						__func__, reg, val, ret);
+
+	return ret;
+}
+
+static void bd2802_update_state(struct bd2802_led *led, enum led_ids id,
+				enum led_colors color, enum led_bits led_bit)
+{
+	int i;
+	u8 value;
+
+	for (i = 0; i < LED_NUM; i++) {
+		if (i == id) {
+			switch (color) {
+			case RED:
+				led->led[i].r = led_bit;
+				break;
+			case GREEN:
+				led->led[i].g = led_bit;
+				break;
+			case BLUE:
+				led->led[i].b = led_bit;
+				break;
+			default:
+				dev_err(&led->client->dev,
+					"%s: Invalid color\n", __func__);
+				return;
+			}
+		}
+	}
+
+	if (led_bit == BD2802_BLINK || led_bit == BD2802_ON)
+		return;
+
+	if (!bd2802_is_led_off(led, id))
+		return;
+
+	if (bd2802_is_all_off(led) && !led->adf_on) {
+		gpio_set_value(led->pdata->reset_gpio, 0);
+		return;
+	}
+
+	/*
+	 * In this case, other led is turned on, and current led is turned
+	 * off. So set RGB LED Control register to stop the current RGB LED
+	 */
+	value = (id == LED1) ? LED_CTL(1, 0) : LED_CTL(0, 1);
+	bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
+}
+
+static void bd2802_configure(struct bd2802_led *led)
+{
+	struct bd2802_led_platform_data *pdata = led->pdata;
+	u8 reg;
+
+	reg = bd2802_get_reg_addr(LED1, RED, BD2802_REG_HOURSETUP);
+	bd2802_write_byte(led->client, reg, pdata->rgb_time);
+
+	reg = bd2802_get_reg_addr(LED2, RED, BD2802_REG_HOURSETUP);
+	bd2802_write_byte(led->client, reg, pdata->rgb_time);
+}
+
+static void bd2802_reset_cancel(struct bd2802_led *led)
+{
+	gpio_set_value(led->pdata->reset_gpio, 1);
+	udelay(100);
+	bd2802_configure(led);
+}
+
+static void bd2802_enable(struct bd2802_led *led, enum led_ids id)
+{
+	enum led_ids other_led = (id == LED1) ? LED2 : LED1;
+	u8 value, other_led_on;
+
+	other_led_on = !bd2802_is_led_off(led, other_led);
+	if (id == LED1)
+		value = LED_CTL(other_led_on, 1);
+	else
+		value = LED_CTL(1 , other_led_on);
+
+	bd2802_write_byte(led->client, BD2802_REG_CONTROL, value);
+}
+
+static void bd2802_set_on(struct bd2802_led *led, enum led_ids id,
+							enum led_colors color)
+{
+	u8 reg;
+
+	if (bd2802_is_all_off(led) && !led->adf_on)
+		bd2802_reset_cancel(led);
+
+	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
+	bd2802_write_byte(led->client, reg, led->rgb_current);
+	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
+	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
+	reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
+	bd2802_write_byte(led->client, reg, BD2802_PATTERN_FULL);
+
+	bd2802_enable(led, id);
+	bd2802_update_state(led, id, color, BD2802_ON);
+}
+
+static void bd2802_set_blink(struct bd2802_led *led, enum led_ids id,
+							enum led_colors color)
+{
+	u8 reg;
+
+	if (bd2802_is_all_off(led) && !led->adf_on)
+		bd2802_reset_cancel(led);
+
+	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
+	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
+	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
+	bd2802_write_byte(led->client, reg, led->rgb_current);
+	reg = bd2802_get_reg_addr(id, color, BD2802_REG_WAVEPATTERN);
+	bd2802_write_byte(led->client, reg, led->wave_pattern);
+
+	bd2802_enable(led, id);
+	bd2802_update_state(led, id, color, BD2802_BLINK);
+}
+
+static void bd2802_turn_on(struct bd2802_led *led, enum led_ids id,
+				enum led_colors color, enum led_bits led_bit)
+{
+	if (led_bit == BD2802_OFF) {
+		dev_err(&led->client->dev,
+					"Only 'blink' and 'on' are allowed\n");
+		return;
+	}
+
+	if (led_bit == BD2802_BLINK)
+		bd2802_set_blink(led, id, color);
+	else
+		bd2802_set_on(led, id, color);
+}
+
+static void bd2802_turn_off(struct bd2802_led *led, enum led_ids id,
+							enum led_colors color)
+{
+	u8 reg;
+
+	if (bd2802_is_rgb_off(led, id, color))
+		return;
+
+	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT1SETUP);
+	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
+	reg = bd2802_get_reg_addr(id, color, BD2802_REG_CURRENT2SETUP);
+	bd2802_write_byte(led->client, reg, BD2802_CURRENT_000);
+
+	bd2802_update_state(led, id, color, BD2802_OFF);
+}
+
+#define BD2802_SET_REGISTER(reg_addr, reg_name)				\
+static ssize_t bd2802_store_reg##reg_addr(struct device *dev,		\
+	struct device_attribute *attr, const char *buf, size_t count)	\
+{									\
+	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
+	unsigned long val;						\
+	int ret;							\
+	if (!count)							\
+		return -EINVAL;						\
+	ret = kstrtoul(buf, 16, &val);					\
+	if (ret)							\
+		return ret;						\
+	down_write(&led->rwsem);					\
+	bd2802_write_byte(led->client, reg_addr, (u8) val);		\
+	up_write(&led->rwsem);						\
+	return count;							\
+}									\
+static struct device_attribute bd2802_reg##reg_addr##_attr = {		\
+	.attr = {.name = reg_name, .mode = 0644},			\
+	.store = bd2802_store_reg##reg_addr,				\
+};
+
+BD2802_SET_REGISTER(0x00, "0x00");
+BD2802_SET_REGISTER(0x01, "0x01");
+BD2802_SET_REGISTER(0x02, "0x02");
+BD2802_SET_REGISTER(0x03, "0x03");
+BD2802_SET_REGISTER(0x04, "0x04");
+BD2802_SET_REGISTER(0x05, "0x05");
+BD2802_SET_REGISTER(0x06, "0x06");
+BD2802_SET_REGISTER(0x07, "0x07");
+BD2802_SET_REGISTER(0x08, "0x08");
+BD2802_SET_REGISTER(0x09, "0x09");
+BD2802_SET_REGISTER(0x0a, "0x0a");
+BD2802_SET_REGISTER(0x0b, "0x0b");
+BD2802_SET_REGISTER(0x0c, "0x0c");
+BD2802_SET_REGISTER(0x0d, "0x0d");
+BD2802_SET_REGISTER(0x0e, "0x0e");
+BD2802_SET_REGISTER(0x0f, "0x0f");
+BD2802_SET_REGISTER(0x10, "0x10");
+BD2802_SET_REGISTER(0x11, "0x11");
+BD2802_SET_REGISTER(0x12, "0x12");
+BD2802_SET_REGISTER(0x13, "0x13");
+BD2802_SET_REGISTER(0x14, "0x14");
+BD2802_SET_REGISTER(0x15, "0x15");
+
+static struct device_attribute *bd2802_addr_attributes[] = {
+	&bd2802_reg0x00_attr,
+	&bd2802_reg0x01_attr,
+	&bd2802_reg0x02_attr,
+	&bd2802_reg0x03_attr,
+	&bd2802_reg0x04_attr,
+	&bd2802_reg0x05_attr,
+	&bd2802_reg0x06_attr,
+	&bd2802_reg0x07_attr,
+	&bd2802_reg0x08_attr,
+	&bd2802_reg0x09_attr,
+	&bd2802_reg0x0a_attr,
+	&bd2802_reg0x0b_attr,
+	&bd2802_reg0x0c_attr,
+	&bd2802_reg0x0d_attr,
+	&bd2802_reg0x0e_attr,
+	&bd2802_reg0x0f_attr,
+	&bd2802_reg0x10_attr,
+	&bd2802_reg0x11_attr,
+	&bd2802_reg0x12_attr,
+	&bd2802_reg0x13_attr,
+	&bd2802_reg0x14_attr,
+	&bd2802_reg0x15_attr,
+};
+
+static void bd2802_enable_adv_conf(struct bd2802_led *led)
+{
+	int i, ret;
+
+	for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++) {
+		ret = device_create_file(&led->client->dev,
+						bd2802_addr_attributes[i]);
+		if (ret) {
+			dev_err(&led->client->dev, "failed: sysfs file %s\n",
+					bd2802_addr_attributes[i]->attr.name);
+			goto failed_remove_files;
+		}
+	}
+
+	if (bd2802_is_all_off(led))
+		bd2802_reset_cancel(led);
+
+	led->adf_on = 1;
+
+	return;
+
+failed_remove_files:
+	for (i--; i >= 0; i--)
+		device_remove_file(&led->client->dev,
+						bd2802_addr_attributes[i]);
+}
+
+static void bd2802_disable_adv_conf(struct bd2802_led *led)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(bd2802_addr_attributes); i++)
+		device_remove_file(&led->client->dev,
+						bd2802_addr_attributes[i]);
+
+	if (bd2802_is_all_off(led))
+		gpio_set_value(led->pdata->reset_gpio, 0);
+
+	led->adf_on = 0;
+}
+
+static ssize_t bd2802_show_adv_conf(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	ssize_t ret;
+
+	down_read(&led->rwsem);
+	if (led->adf_on)
+		ret = sprintf(buf, "on\n");
+	else
+		ret = sprintf(buf, "off\n");
+	up_read(&led->rwsem);
+
+	return ret;
+}
+
+static ssize_t bd2802_store_adv_conf(struct device *dev,
+	struct device_attribute *attr, const char *buf, size_t count)
+{
+	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));
+
+	if (!count)
+		return -EINVAL;
+
+	down_write(&led->rwsem);
+	if (!led->adf_on && !strncmp(buf, "on", 2))
+		bd2802_enable_adv_conf(led);
+	else if (led->adf_on && !strncmp(buf, "off", 3))
+		bd2802_disable_adv_conf(led);
+	up_write(&led->rwsem);
+
+	return count;
+}
+
+static struct device_attribute bd2802_adv_conf_attr = {
+	.attr = {
+		.name = "advanced_configuration",
+		.mode = 0644,
+	},
+	.show = bd2802_show_adv_conf,
+	.store = bd2802_store_adv_conf,
+};
+
+#define BD2802_CONTROL_ATTR(attr_name, name_str)			\
+static ssize_t bd2802_show_##attr_name(struct device *dev,		\
+	struct device_attribute *attr, char *buf)			\
+{									\
+	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
+	ssize_t ret;							\
+	down_read(&led->rwsem);						\
+	ret = sprintf(buf, "0x%02x\n", led->attr_name);			\
+	up_read(&led->rwsem);						\
+	return ret;							\
+}									\
+static ssize_t bd2802_store_##attr_name(struct device *dev,		\
+	struct device_attribute *attr, const char *buf, size_t count)	\
+{									\
+	struct bd2802_led *led = i2c_get_clientdata(to_i2c_client(dev));\
+	unsigned long val;						\
+	int ret;							\
+	if (!count)							\
+		return -EINVAL;						\
+	ret = kstrtoul(buf, 16, &val);					\
+	if (ret)							\
+		return ret;						\
+	down_write(&led->rwsem);					\
+	led->attr_name = val;						\
+	up_write(&led->rwsem);						\
+	return count;							\
+}									\
+static struct device_attribute bd2802_##attr_name##_attr = {		\
+	.attr = {							\
+		.name = name_str,					\
+		.mode = 0644,						\
+	},								\
+	.show = bd2802_show_##attr_name,				\
+	.store = bd2802_store_##attr_name,				\
+};
+
+BD2802_CONTROL_ATTR(wave_pattern, "wave_pattern");
+BD2802_CONTROL_ATTR(rgb_current, "rgb_current");
+
+static struct device_attribute *bd2802_attributes[] = {
+	&bd2802_adv_conf_attr,
+	&bd2802_wave_pattern_attr,
+	&bd2802_rgb_current_attr,
+};
+
+static void bd2802_led_work(struct work_struct *work)
+{
+	struct bd2802_led *led = container_of(work, struct bd2802_led, work);
+
+	if (led->state)
+		bd2802_turn_on(led, led->led_id, led->color, led->state);
+	else
+		bd2802_turn_off(led, led->led_id, led->color);
+}
+
+#define BD2802_CONTROL_RGBS(name, id, clr)				\
+static void bd2802_set_##name##_brightness(struct led_classdev *led_cdev,\
+					enum led_brightness value)	\
+{									\
+	struct bd2802_led *led =					\
+		container_of(led_cdev, struct bd2802_led, cdev_##name);	\
+	led->led_id = id;						\
+	led->color = clr;						\
+	if (value == LED_OFF)						\
+		led->state = BD2802_OFF;				\
+	else								\
+		led->state = BD2802_ON;					\
+	schedule_work(&led->work);					\
+}									\
+static int bd2802_set_##name##_blink(struct led_classdev *led_cdev,	\
+		unsigned long *delay_on, unsigned long *delay_off)	\
+{									\
+	struct bd2802_led *led =					\
+		container_of(led_cdev, struct bd2802_led, cdev_##name);	\
+	if (*delay_on == 0 || *delay_off == 0)				\
+		return -EINVAL;						\
+	led->led_id = id;						\
+	led->color = clr;						\
+	led->state = BD2802_BLINK;					\
+	schedule_work(&led->work);					\
+	return 0;							\
+}
+
+BD2802_CONTROL_RGBS(led1r, LED1, RED);
+BD2802_CONTROL_RGBS(led1g, LED1, GREEN);
+BD2802_CONTROL_RGBS(led1b, LED1, BLUE);
+BD2802_CONTROL_RGBS(led2r, LED2, RED);
+BD2802_CONTROL_RGBS(led2g, LED2, GREEN);
+BD2802_CONTROL_RGBS(led2b, LED2, BLUE);
+
+static int bd2802_register_led_classdev(struct bd2802_led *led)
+{
+	int ret;
+
+	INIT_WORK(&led->work, bd2802_led_work);
+
+	led->cdev_led1r.name = "led1_R";
+	led->cdev_led1r.brightness = LED_OFF;
+	led->cdev_led1r.brightness_set = bd2802_set_led1r_brightness;
+	led->cdev_led1r.blink_set = bd2802_set_led1r_blink;
+
+	ret = led_classdev_register(&led->client->dev, &led->cdev_led1r);
+	if (ret < 0) {
+		dev_err(&led->client->dev, "couldn't register LED %s\n",
+							led->cdev_led1r.name);
+		goto failed_unregister_led1_R;
+	}
+
+	led->cdev_led1g.name = "led1_G";
+	led->cdev_led1g.brightness = LED_OFF;
+	led->cdev_led1g.brightness_set = bd2802_set_led1g_brightness;
+	led->cdev_led1g.blink_set = bd2802_set_led1g_blink;
+
+	ret = led_classdev_register(&led->client->dev, &led->cdev_led1g);
+	if (ret < 0) {
+		dev_err(&led->client->dev, "couldn't register LED %s\n",
+							led->cdev_led1g.name);
+		goto failed_unregister_led1_G;
+	}
+
+	led->cdev_led1b.name = "led1_B";
+	led->cdev_led1b.brightness = LED_OFF;
+	led->cdev_led1b.brightness_set = bd2802_set_led1b_brightness;
+	led->cdev_led1b.blink_set = bd2802_set_led1b_blink;
+
+	ret = led_classdev_register(&led->client->dev, &led->cdev_led1b);
+	if (ret < 0) {
+		dev_err(&led->client->dev, "couldn't register LED %s\n",
+							led->cdev_led1b.name);
+		goto failed_unregister_led1_B;
+	}
+
+	led->cdev_led2r.name = "led2_R";
+	led->cdev_led2r.brightness = LED_OFF;
+	led->cdev_led2r.brightness_set = bd2802_set_led2r_brightness;
+	led->cdev_led2r.blink_set = bd2802_set_led2r_blink;
+
+	ret = led_classdev_register(&led->client->dev, &led->cdev_led2r);
+	if (ret < 0) {
+		dev_err(&led->client->dev, "couldn't register LED %s\n",
+							led->cdev_led2r.name);
+		goto failed_unregister_led2_R;
+	}
+
+	led->cdev_led2g.name = "led2_G";
+	led->cdev_led2g.brightness = LED_OFF;
+	led->cdev_led2g.brightness_set = bd2802_set_led2g_brightness;
+	led->cdev_led2g.blink_set = bd2802_set_led2g_blink;
+
+	ret = led_classdev_register(&led->client->dev, &led->cdev_led2g);
+	if (ret < 0) {
+		dev_err(&led->client->dev, "couldn't register LED %s\n",
+							led->cdev_led2g.name);
+		goto failed_unregister_led2_G;
+	}
+
+	led->cdev_led2b.name = "led2_B";
+	led->cdev_led2b.brightness = LED_OFF;
+	led->cdev_led2b.brightness_set = bd2802_set_led2b_brightness;
+	led->cdev_led2b.blink_set = bd2802_set_led2b_blink;
+	led->cdev_led2b.flags |= LED_CORE_SUSPENDRESUME;
+
+	ret = led_classdev_register(&led->client->dev, &led->cdev_led2b);
+	if (ret < 0) {
+		dev_err(&led->client->dev, "couldn't register LED %s\n",
+							led->cdev_led2b.name);
+		goto failed_unregister_led2_B;
+	}
+
+	return 0;
+
+failed_unregister_led2_B:
+	led_classdev_unregister(&led->cdev_led2g);
+failed_unregister_led2_G:
+	led_classdev_unregister(&led->cdev_led2r);
+failed_unregister_led2_R:
+	led_classdev_unregister(&led->cdev_led1b);
+failed_unregister_led1_B:
+	led_classdev_unregister(&led->cdev_led1g);
+failed_unregister_led1_G:
+	led_classdev_unregister(&led->cdev_led1r);
+failed_unregister_led1_R:
+
+	return ret;
+}
+
+static void bd2802_unregister_led_classdev(struct bd2802_led *led)
+{
+	cancel_work_sync(&led->work);
+	led_classdev_unregister(&led->cdev_led2b);
+	led_classdev_unregister(&led->cdev_led2g);
+	led_classdev_unregister(&led->cdev_led2r);
+	led_classdev_unregister(&led->cdev_led1b);
+	led_classdev_unregister(&led->cdev_led1g);
+	led_classdev_unregister(&led->cdev_led1r);
+}
+
+static int bd2802_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct bd2802_led *led;
+	struct bd2802_led_platform_data *pdata;
+	int ret, i;
+
+	led = devm_kzalloc(&client->dev, sizeof(struct bd2802_led), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	led->client = client;
+	pdata = led->pdata = dev_get_platdata(&client->dev);
+	i2c_set_clientdata(client, led);
+
+	/* Configure RESET GPIO (L: RESET, H: RESET cancel) */
+	gpio_request_one(pdata->reset_gpio, GPIOF_OUT_INIT_HIGH, "RGB_RESETB");
+
+	/* Tacss = min 0.1ms */
+	udelay(100);
+
+	/* Detect BD2802GU */
+	ret = bd2802_write_byte(client, BD2802_REG_CLKSETUP, 0x00);
+	if (ret < 0) {
+		dev_err(&client->dev, "failed to detect device\n");
+		return ret;
+	} else
+		dev_info(&client->dev, "return 0x%02x\n", ret);
+
+	/* To save the power, reset BD2802 after detecting */
+	gpio_set_value(led->pdata->reset_gpio, 0);
+
+	/* Default attributes */
+	led->wave_pattern = BD2802_PATTERN_HALF;
+	led->rgb_current = BD2802_CURRENT_032;
+
+	init_rwsem(&led->rwsem);
+
+	for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++) {
+		ret = device_create_file(&led->client->dev,
+						bd2802_attributes[i]);
+		if (ret) {
+			dev_err(&led->client->dev, "failed: sysfs file %s\n",
+					bd2802_attributes[i]->attr.name);
+			goto failed_unregister_dev_file;
+		}
+	}
+
+	ret = bd2802_register_led_classdev(led);
+	if (ret < 0)
+		goto failed_unregister_dev_file;
+
+	return 0;
+
+failed_unregister_dev_file:
+	for (i--; i >= 0; i--)
+		device_remove_file(&led->client->dev, bd2802_attributes[i]);
+	return ret;
+}
+
+static int bd2802_remove(struct i2c_client *client)
+{
+	struct bd2802_led *led = i2c_get_clientdata(client);
+	int i;
+
+	gpio_set_value(led->pdata->reset_gpio, 0);
+	bd2802_unregister_led_classdev(led);
+	if (led->adf_on)
+		bd2802_disable_adv_conf(led);
+	for (i = 0; i < ARRAY_SIZE(bd2802_attributes); i++)
+		device_remove_file(&led->client->dev, bd2802_attributes[i]);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static void bd2802_restore_state(struct bd2802_led *led)
+{
+	int i;
+
+	for (i = 0; i < LED_NUM; i++) {
+		if (led->led[i].r)
+			bd2802_turn_on(led, i, RED, led->led[i].r);
+		if (led->led[i].g)
+			bd2802_turn_on(led, i, GREEN, led->led[i].g);
+		if (led->led[i].b)
+			bd2802_turn_on(led, i, BLUE, led->led[i].b);
+	}
+}
+
+static int bd2802_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct bd2802_led *led = i2c_get_clientdata(client);
+
+	gpio_set_value(led->pdata->reset_gpio, 0);
+
+	return 0;
+}
+
+static int bd2802_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct bd2802_led *led = i2c_get_clientdata(client);
+
+	if (!bd2802_is_all_off(led) || led->adf_on) {
+		bd2802_reset_cancel(led);
+		bd2802_restore_state(led);
+	}
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(bd2802_pm, bd2802_suspend, bd2802_resume);
+
+static const struct i2c_device_id bd2802_id[] = {
+	{ "BD2802", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, bd2802_id);
+
+static struct i2c_driver bd2802_i2c_driver = {
+	.driver	= {
+		.name	= "BD2802",
+		.pm	= &bd2802_pm,
+	},
+	.probe		= bd2802_probe,
+	.remove		= bd2802_remove,
+	.id_table	= bd2802_id,
+};
+
+module_i2c_driver(bd2802_i2c_driver);
+
+MODULE_AUTHOR("Kim Kyuwon <q1.kim@samsung.com>");
+MODULE_DESCRIPTION("BD2802 LED driver");
+MODULE_LICENSE("GPL v2");

drivers/leds/leds-blinkm.c

@@ -0,0 +1,811 @@
+/*
+ *  leds-blinkm.c
+ *  (c) Jan-Simon Möller (dl9pf@gmx.de)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/jiffies.h>
+#include <linux/i2c.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+#include <linux/sysfs.h>
+#include <linux/printk.h>
+#include <linux/pm_runtime.h>
+#include <linux/leds.h>
+#include <linux/delay.h>
+
+/* Addresses to scan - BlinkM is on 0x09 by default*/
+static const unsigned short normal_i2c[] = { 0x09, I2C_CLIENT_END };
+
+static int blinkm_transfer_hw(struct i2c_client *client, int cmd);
+static int blinkm_test_run(struct i2c_client *client);
+
+struct blinkm_led {
+	struct i2c_client *i2c_client;
+	struct led_classdev led_cdev;
+	int id;
+	atomic_t active;
+};
+
+struct blinkm_work {
+	struct blinkm_led *blinkm_led;
+	struct work_struct work;
+};
+
+#define cdev_to_blmled(c)          container_of(c, struct blinkm_led, led_cdev)
+#define work_to_blmwork(c)         container_of(c, struct blinkm_work, work)
+
+struct blinkm_data {
+	struct i2c_client *i2c_client;
+	struct mutex update_lock;
+	/* used for led class interface */
+	struct blinkm_led blinkm_leds[3];
+	/* used for "blinkm" sysfs interface */
+	u8 red;			/* color red */
+	u8 green;		/* color green */
+	u8 blue;		/* color blue */
+	/* next values to use for transfer */
+	u8 next_red;			/* color red */
+	u8 next_green;		/* color green */
+	u8 next_blue;		/* color blue */
+	/* internal use */
+	u8 args[7];		/* set of args for transmission */
+	u8 i2c_addr;		/* i2c addr */
+	u8 fw_ver;		/* firmware version */
+	/* used, but not from userspace */
+	u8 hue;			/* HSB  hue */
+	u8 saturation;		/* HSB  saturation */
+	u8 brightness;		/* HSB  brightness */
+	u8 next_hue;			/* HSB  hue */
+	u8 next_saturation;		/* HSB  saturation */
+	u8 next_brightness;		/* HSB  brightness */
+	/* currently unused / todo */
+	u8 fade_speed;		/* fade speed     1 - 255 */
+	s8 time_adjust;		/* time adjust -128 - 127 */
+	u8 fade:1;		/* fade on = 1, off = 0 */
+	u8 rand:1;		/* rand fade mode on = 1 */
+	u8 script_id;		/* script ID */
+	u8 script_repeats;	/* repeats of script */
+	u8 script_startline;	/* line to start */
+};
+
+/* Colors */
+#define RED   0
+#define GREEN 1
+#define BLUE  2
+
+/* mapping command names to cmd chars - see datasheet */
+#define BLM_GO_RGB            0
+#define BLM_FADE_RGB          1
+#define BLM_FADE_HSB          2
+#define BLM_FADE_RAND_RGB     3
+#define BLM_FADE_RAND_HSB     4
+#define BLM_PLAY_SCRIPT       5
+#define BLM_STOP_SCRIPT       6
+#define BLM_SET_FADE_SPEED    7
+#define BLM_SET_TIME_ADJ      8
+#define BLM_GET_CUR_RGB       9
+#define BLM_WRITE_SCRIPT_LINE 10
+#define BLM_READ_SCRIPT_LINE  11
+#define BLM_SET_SCRIPT_LR     12	/* Length & Repeats */
+#define BLM_SET_ADDR          13
+#define BLM_GET_ADDR          14
+#define BLM_GET_FW_VER        15
+#define BLM_SET_STARTUP_PARAM 16
+
+/* BlinkM Commands
+ *  as extracted out of the datasheet:
+ *
+ *  cmdchar = command (ascii)
+ *  cmdbyte = command in hex
+ *  nr_args = number of arguments (to send)
+ *  nr_ret  = number of return values (to read)
+ *  dir = direction (0 = read, 1 = write, 2 = both)
+ *
+ */
+static const struct {
+	char cmdchar;
+	u8 cmdbyte;
+	u8 nr_args;
+	u8 nr_ret;
+	u8 dir:2;
+} blinkm_cmds[17] = {
+  /* cmdchar, cmdbyte, nr_args, nr_ret,  dir */
+	{ 'n', 0x6e, 3, 0, 1},
+	{ 'c', 0x63, 3, 0, 1},
+	{ 'h', 0x68, 3, 0, 1},
+	{ 'C', 0x43, 3, 0, 1},
+	{ 'H', 0x48, 3, 0, 1},
+	{ 'p', 0x70, 3, 0, 1},
+	{ 'o', 0x6f, 0, 0, 1},
+	{ 'f', 0x66, 1, 0, 1},
+	{ 't', 0x74, 1, 0, 1},
+	{ 'g', 0x67, 0, 3, 0},
+	{ 'W', 0x57, 7, 0, 1},
+	{ 'R', 0x52, 2, 5, 2},
+	{ 'L', 0x4c, 3, 0, 1},
+	{ 'A', 0x41, 4, 0, 1},
+	{ 'a', 0x61, 0, 1, 0},
+	{ 'Z', 0x5a, 0, 1, 0},
+	{ 'B', 0x42, 5, 0, 1},
+};
+
+static ssize_t show_color_common(struct device *dev, char *buf, int color)
+{
+	struct i2c_client *client;
+	struct blinkm_data *data;
+	int ret;
+
+	client = to_i2c_client(dev);
+	data = i2c_get_clientdata(client);
+
+	ret = blinkm_transfer_hw(client, BLM_GET_CUR_RGB);
+	if (ret < 0)
+		return ret;
+	switch (color) {
+	case RED:
+		return scnprintf(buf, PAGE_SIZE, "%02X\n", data->red);
+	case GREEN:
+		return scnprintf(buf, PAGE_SIZE, "%02X\n", data->green);
+	case BLUE:
+		return scnprintf(buf, PAGE_SIZE, "%02X\n", data->blue);
+	default:
+		return -EINVAL;
+	}
+	return -EINVAL;
+}
+
+static int store_color_common(struct device *dev, const char *buf, int color)
+{
+	struct i2c_client *client;
+	struct blinkm_data *data;
+	int ret;
+	u8 value;
+
+	client = to_i2c_client(dev);
+	data = i2c_get_clientdata(client);
+
+	ret = kstrtou8(buf, 10, &value);
+	if (ret < 0) {
+		dev_err(dev, "BlinkM: value too large!\n");
+		return ret;
+	}
+
+	switch (color) {
+	case RED:
+		data->next_red = value;
+		break;
+	case GREEN:
+		data->next_green = value;
+		break;
+	case BLUE:
+		data->next_blue = value;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	dev_dbg(dev, "next_red = %d, next_green = %d, next_blue = %d\n",
+			data->next_red, data->next_green, data->next_blue);
+
+	/* if mode ... */
+	ret = blinkm_transfer_hw(client, BLM_GO_RGB);
+	if (ret < 0) {
+		dev_err(dev, "BlinkM: can't set RGB\n");
+		return ret;
+	}
+	return 0;
+}
+
+static ssize_t show_red(struct device *dev, struct device_attribute *attr,
+			char *buf)
+{
+	return show_color_common(dev, buf, RED);
+}
+
+static ssize_t store_red(struct device *dev, struct device_attribute *attr,
+			 const char *buf, size_t count)
+{
+	int ret;
+
+	ret = store_color_common(dev, buf, RED);
+	if (ret < 0)
+		return ret;
+	return count;
+}
+
+static DEVICE_ATTR(red, S_IRUGO | S_IWUSR, show_red, store_red);
+
+static ssize_t show_green(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	return show_color_common(dev, buf, GREEN);
+}
+
+static ssize_t store_green(struct device *dev, struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+
+	int ret;
+
+	ret = store_color_common(dev, buf, GREEN);
+	if (ret < 0)
+		return ret;
+	return count;
+}
+
+static DEVICE_ATTR(green, S_IRUGO | S_IWUSR, show_green, store_green);
+
+static ssize_t show_blue(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	return show_color_common(dev, buf, BLUE);
+}
+
+static ssize_t store_blue(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+	int ret;
+
+	ret = store_color_common(dev, buf, BLUE);
+	if (ret < 0)
+		return ret;
+	return count;
+}
+
+static DEVICE_ATTR(blue, S_IRUGO | S_IWUSR, show_blue, store_blue);
+
+static ssize_t show_test(struct device *dev, struct device_attribute *attr,
+			 char *buf)
+{
+	return scnprintf(buf, PAGE_SIZE,
+			 "#Write into test to start test sequence!#\n");
+}
+
+static ssize_t store_test(struct device *dev, struct device_attribute *attr,
+			  const char *buf, size_t count)
+{
+
+	struct i2c_client *client;
+	int ret;
+	client = to_i2c_client(dev);
+
+	/*test */
+	ret = blinkm_test_run(client);
+	if (ret < 0)
+		return ret;
+
+	return count;
+}
+
+static DEVICE_ATTR(test, S_IRUGO | S_IWUSR, show_test, store_test);
+
+/* TODO: HSB, fade, timeadj, script ... */
+
+static struct attribute *blinkm_attrs[] = {
+	&dev_attr_red.attr,
+	&dev_attr_green.attr,
+	&dev_attr_blue.attr,
+	&dev_attr_test.attr,
+	NULL,
+};
+
+static struct attribute_group blinkm_group = {
+	.name = "blinkm",
+	.attrs = blinkm_attrs,
+};
+
+static int blinkm_write(struct i2c_client *client, int cmd, u8 *arg)
+{
+	int result;
+	int i;
+	int arglen = blinkm_cmds[cmd].nr_args;
+	/* write out cmd to blinkm - always / default step */
+	result = i2c_smbus_write_byte(client, blinkm_cmds[cmd].cmdbyte);
+	if (result < 0)
+		return result;
+	/* no args to write out */
+	if (arglen == 0)
+		return 0;
+
+	for (i = 0; i < arglen; i++) {
+		/* repeat for arglen */
+		result = i2c_smbus_write_byte(client, arg[i]);
+		if (result < 0)
+			return result;
+	}
+	return 0;
+}
+
+static int blinkm_read(struct i2c_client *client, int cmd, u8 *arg)
+{
+	int result;
+	int i;
+	int retlen = blinkm_cmds[cmd].nr_ret;
+	for (i = 0; i < retlen; i++) {
+		/* repeat for retlen */
+		result = i2c_smbus_read_byte(client);
+		if (result < 0)
+			return result;
+		arg[i] = result;
+	}
+
+	return 0;
+}
+
+static int blinkm_transfer_hw(struct i2c_client *client, int cmd)
+{
+	/* the protocol is simple but non-standard:
+	 * e.g.  cmd 'g' (= 0x67) for "get device address"
+	 * - which defaults to 0x09 - would be the sequence:
+	 *   a) write 0x67 to the device (byte write)
+	 *   b) read the value (0x09) back right after (byte read)
+	 *
+	 * Watch out for "unfinished" sequences (i.e. not enough reads
+	 * or writes after a command. It will make the blinkM misbehave.
+	 * Sequence is key here.
+	 */
+
+	/* args / return are in private data struct */
+	struct blinkm_data *data = i2c_get_clientdata(client);
+
+	/* We start hardware transfers which are not to be
+	 * mixed with other commands. Aquire a lock now. */
+	if (mutex_lock_interruptible(&data->update_lock) < 0)
+		return -EAGAIN;
+
+	/* switch cmd - usually write before reads */
+	switch (cmd) {
+	case BLM_FADE_RAND_RGB:
+	case BLM_GO_RGB:
+	case BLM_FADE_RGB:
+		data->args[0] = data->next_red;
+		data->args[1] = data->next_green;
+		data->args[2] = data->next_blue;
+		blinkm_write(client, cmd, data->args);
+		data->red = data->args[0];
+		data->green = data->args[1];
+		data->blue = data->args[2];
+		break;
+	case BLM_FADE_HSB:
+	case BLM_FADE_RAND_HSB:
+		data->args[0] = data->next_hue;
+		data->args[1] = data->next_saturation;
+		data->args[2] = data->next_brightness;
+		blinkm_write(client, cmd, data->args);
+		data->hue = data->next_hue;
+		data->saturation = data->next_saturation;
+		data->brightness = data->next_brightness;
+		break;
+	case BLM_PLAY_SCRIPT:
+		data->args[0] = data->script_id;
+		data->args[1] = data->script_repeats;
+		data->args[2] = data->script_startline;
+		blinkm_write(client, cmd, data->args);
+		break;
+	case BLM_STOP_SCRIPT:
+		blinkm_write(client, cmd, NULL);
+		break;
+	case BLM_GET_CUR_RGB:
+		data->args[0] = data->red;
+		data->args[1] = data->green;
+		data->args[2] = data->blue;
+		blinkm_write(client, cmd, NULL);
+		blinkm_read(client, cmd, data->args);
+		data->red = data->args[0];
+		data->green = data->args[1];
+		data->blue = data->args[2];
+		break;
+	case BLM_GET_ADDR:
+		data->args[0] = data->i2c_addr;
+		blinkm_write(client, cmd, NULL);
+		blinkm_read(client, cmd, data->args);
+		data->i2c_addr = data->args[0];
+		break;
+	case BLM_SET_TIME_ADJ:
+	case BLM_SET_FADE_SPEED:
+	case BLM_READ_SCRIPT_LINE:
+	case BLM_WRITE_SCRIPT_LINE:
+	case BLM_SET_SCRIPT_LR:
+	case BLM_SET_ADDR:
+	case BLM_GET_FW_VER:
+	case BLM_SET_STARTUP_PARAM:
+		dev_err(&client->dev,
+				"BlinkM: cmd %d not implemented yet.\n", cmd);
+		break;
+	default:
+		dev_err(&client->dev, "BlinkM: unknown command %d\n", cmd);
+		mutex_unlock(&data->update_lock);
+		return -EINVAL;
+	}			/* end switch(cmd) */
+
+	/* transfers done, unlock */
+	mutex_unlock(&data->update_lock);
+	return 0;
+}
+
+static void led_work(struct work_struct *work)
+{
+	int ret;
+	struct blinkm_led *led;
+	struct blinkm_data *data;
+	struct blinkm_work *blm_work = work_to_blmwork(work);
+
+	led = blm_work->blinkm_led;
+	data = i2c_get_clientdata(led->i2c_client);
+	ret = blinkm_transfer_hw(led->i2c_client, BLM_GO_RGB);
+	atomic_dec(&led->active);
+	dev_dbg(&led->i2c_client->dev,
+			"# DONE # next_red = %d, next_green = %d,"
+			" next_blue = %d, active = %d\n",
+			data->next_red, data->next_green,
+			data->next_blue, atomic_read(&led->active));
+	kfree(blm_work);
+}
+
+static int blinkm_led_common_set(struct led_classdev *led_cdev,
+				 enum led_brightness value, int color)
+{
+	/* led_brightness is 0, 127 or 255 - we just use it here as-is */
+	struct blinkm_led *led = cdev_to_blmled(led_cdev);
+	struct blinkm_data *data = i2c_get_clientdata(led->i2c_client);
+	struct blinkm_work *bl_work;
+
+	switch (color) {
+	case RED:
+		/* bail out if there's no change */
+		if (data->next_red == (u8) value)
+			return 0;
+		/* we assume a quite fast sequence here ([off]->on->off)
+		 * think of network led trigger - we cannot blink that fast, so
+		 * in case we already have a off->on->off transition queued up,
+		 * we refuse to queue up more.
+		 * Revisit: fast-changing brightness. */
+		if (atomic_read(&led->active) > 1)
+			return 0;
+		data->next_red = (u8) value;
+		break;
+	case GREEN:
+		/* bail out if there's no change */
+		if (data->next_green == (u8) value)
+			return 0;
+		/* we assume a quite fast sequence here ([off]->on->off)
+		 * Revisit: fast-changing brightness. */
+		if (atomic_read(&led->active) > 1)
+			return 0;
+		data->next_green = (u8) value;
+		break;
+	case BLUE:
+		/* bail out if there's no change */
+		if (data->next_blue == (u8) value)
+			return 0;
+		/* we assume a quite fast sequence here ([off]->on->off)
+		 * Revisit: fast-changing brightness. */
+		if (atomic_read(&led->active) > 1)
+			return 0;
+		data->next_blue = (u8) value;
+		break;
+
+	default:
+		dev_err(&led->i2c_client->dev, "BlinkM: unknown color.\n");
+		return -EINVAL;
+	}
+
+	bl_work = kzalloc(sizeof(*bl_work), GFP_ATOMIC);
+	if (!bl_work)
+		return -ENOMEM;
+
+	atomic_inc(&led->active);
+	dev_dbg(&led->i2c_client->dev,
+			"#TO_SCHED# next_red = %d, next_green = %d,"
+			" next_blue = %d, active = %d\n",
+			data->next_red, data->next_green,
+			data->next_blue, atomic_read(&led->active));
+
+	/* a fresh work _item_ for each change */
+	bl_work->blinkm_led = led;
+	INIT_WORK(&bl_work->work, led_work);
+	/* queue work in own queue for easy sync on exit*/
+	schedule_work(&bl_work->work);
+
+	return 0;
+}
+
+static void blinkm_led_red_set(struct led_classdev *led_cdev,
+			       enum led_brightness value)
+{
+	blinkm_led_common_set(led_cdev, value, RED);
+}
+
+static void blinkm_led_green_set(struct led_classdev *led_cdev,
+				 enum led_brightness value)
+{
+	blinkm_led_common_set(led_cdev, value, GREEN);
+}
+
+static void blinkm_led_blue_set(struct led_classdev *led_cdev,
+				enum led_brightness value)
+{
+	blinkm_led_common_set(led_cdev, value, BLUE);
+}
+
+static void blinkm_init_hw(struct i2c_client *client)
+{
+	int ret;
+	ret = blinkm_transfer_hw(client, BLM_STOP_SCRIPT);
+	ret = blinkm_transfer_hw(client, BLM_GO_RGB);
+}
+
+static int blinkm_test_run(struct i2c_client *client)
+{
+	int ret;
+	struct blinkm_data *data = i2c_get_clientdata(client);
+
+	data->next_red = 0x01;
+	data->next_green = 0x05;
+	data->next_blue = 0x10;
+	ret = blinkm_transfer_hw(client, BLM_GO_RGB);
+	if (ret < 0)
+		return ret;
+	msleep(2000);
+
+	data->next_red = 0x25;
+	data->next_green = 0x10;
+	data->next_blue = 0x31;
+	ret = blinkm_transfer_hw(client, BLM_FADE_RGB);
+	if (ret < 0)
+		return ret;
+	msleep(2000);
+
+	data->next_hue = 0x50;
+	data->next_saturation = 0x10;
+	data->next_brightness = 0x20;
+	ret = blinkm_transfer_hw(client, BLM_FADE_HSB);
+	if (ret < 0)
+		return ret;
+	msleep(2000);
+
+	return 0;
+}
+
+/* Return 0 if detection is successful, -ENODEV otherwise */
+static int blinkm_detect(struct i2c_client *client, struct i2c_board_info *info)
+{
+	struct i2c_adapter *adapter = client->adapter;
+	int ret;
+	int count = 99;
+	u8 tmpargs[7];
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
+				     | I2C_FUNC_SMBUS_WORD_DATA
+				     | I2C_FUNC_SMBUS_WRITE_BYTE))
+		return -ENODEV;
+
+	/* Now, we do the remaining detection. Simple for now. */
+	/* We might need more guards to protect other i2c slaves */
+
+	/* make sure the blinkM is balanced (read/writes) */
+	while (count > 0) {
+		ret = blinkm_write(client, BLM_GET_ADDR, NULL);
+		usleep_range(5000, 10000);
+		ret = blinkm_read(client, BLM_GET_ADDR, tmpargs);
+		usleep_range(5000, 10000);
+		if (tmpargs[0] == 0x09)
+			count = 0;
+		count--;
+	}
+
+	/* Step 1: Read BlinkM address back  -  cmd_char 'a' */
+	ret = blinkm_write(client, BLM_GET_ADDR, NULL);
+	if (ret < 0)
+		return ret;
+	usleep_range(20000, 30000);	/* allow a small delay */
+	ret = blinkm_read(client, BLM_GET_ADDR, tmpargs);
+	if (ret < 0)
+		return ret;
+
+	if (tmpargs[0] != 0x09) {
+		dev_err(&client->dev, "enodev DEV ADDR = 0x%02X\n", tmpargs[0]);
+		return -ENODEV;
+	}
+
+	strlcpy(info->type, "blinkm", I2C_NAME_SIZE);
+	return 0;
+}
+
+static int blinkm_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	struct blinkm_data *data;
+	struct blinkm_led *led[3];
+	int err, i;
+	char blinkm_led_name[28];
+
+	data = devm_kzalloc(&client->dev,
+			sizeof(struct blinkm_data), GFP_KERNEL);
+	if (!data) {
+		err = -ENOMEM;
+		goto exit;
+	}
+
+	data->i2c_addr = 0x09;
+	data->i2c_addr = 0x08;
+	/* i2c addr  - use fake addr of 0x08 initially (real is 0x09) */
+	data->fw_ver = 0xfe;
+	/* firmware version - use fake until we read real value
+	 * (currently broken - BlinkM confused!) */
+	data->script_id = 0x01;
+	data->i2c_client = client;
+
+	i2c_set_clientdata(client, data);
+	mutex_init(&data->update_lock);
+
+	/* Register sysfs hooks */
+	err = sysfs_create_group(&client->dev.kobj, &blinkm_group);
+	if (err < 0) {
+		dev_err(&client->dev, "couldn't register sysfs group\n");
+		goto exit;
+	}
+
+	for (i = 0; i < 3; i++) {
+		/* RED = 0, GREEN = 1, BLUE = 2 */
+		led[i] = &data->blinkm_leds[i];
+		led[i]->i2c_client = client;
+		led[i]->id = i;
+		led[i]->led_cdev.max_brightness = 255;
+		led[i]->led_cdev.flags = LED_CORE_SUSPENDRESUME;
+		atomic_set(&led[i]->active, 0);
+		switch (i) {
+		case RED:
+			snprintf(blinkm_led_name, sizeof(blinkm_led_name),
+					 "blinkm-%d-%d-red",
+					 client->adapter->nr,
+					 client->addr);
+			led[i]->led_cdev.name = blinkm_led_name;
+			led[i]->led_cdev.brightness_set = blinkm_led_red_set;
+			err = led_classdev_register(&client->dev,
+						    &led[i]->led_cdev);
+			if (err < 0) {
+				dev_err(&client->dev,
+					"couldn't register LED %s\n",
+					led[i]->led_cdev.name);
+				goto failred;
+			}
+			break;
+		case GREEN:
+			snprintf(blinkm_led_name, sizeof(blinkm_led_name),
+					 "blinkm-%d-%d-green",
+					 client->adapter->nr,
+					 client->addr);
+			led[i]->led_cdev.name = blinkm_led_name;
+			led[i]->led_cdev.brightness_set = blinkm_led_green_set;
+			err = led_classdev_register(&client->dev,
+						    &led[i]->led_cdev);
+			if (err < 0) {
+				dev_err(&client->dev,
+					"couldn't register LED %s\n",
+					led[i]->led_cdev.name);
+				goto failgreen;
+			}
+			break;
+		case BLUE:
+			snprintf(blinkm_led_name, sizeof(blinkm_led_name),
+					 "blinkm-%d-%d-blue",
+					 client->adapter->nr,
+					 client->addr);
+			led[i]->led_cdev.name = blinkm_led_name;
+			led[i]->led_cdev.brightness_set = blinkm_led_blue_set;
+			err = led_classdev_register(&client->dev,
+						    &led[i]->led_cdev);
+			if (err < 0) {
+				dev_err(&client->dev,
+					"couldn't register LED %s\n",
+					led[i]->led_cdev.name);
+				goto failblue;
+			}
+			break;
+		}		/* end switch */
+	}			/* end for */
+
+	/* Initialize the blinkm */
+	blinkm_init_hw(client);
+
+	return 0;
+
+failblue:
+	led_classdev_unregister(&led[GREEN]->led_cdev);
+
+failgreen:
+	led_classdev_unregister(&led[RED]->led_cdev);
+
+failred:
+	sysfs_remove_group(&client->dev.kobj, &blinkm_group);
+exit:
+	return err;
+}
+
+static int blinkm_remove(struct i2c_client *client)
+{
+	struct blinkm_data *data = i2c_get_clientdata(client);
+	int ret = 0;
+	int i;
+
+	/* make sure no workqueue entries are pending */
+	for (i = 0; i < 3; i++) {
+		flush_scheduled_work();
+		led_classdev_unregister(&data->blinkm_leds[i].led_cdev);
+	}
+
+	/* reset rgb */
+	data->next_red = 0x00;
+	data->next_green = 0x00;
+	data->next_blue = 0x00;
+	ret = blinkm_transfer_hw(client, BLM_FADE_RGB);
+	if (ret < 0)
+		dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
+
+	/* reset hsb */
+	data->next_hue = 0x00;
+	data->next_saturation = 0x00;
+	data->next_brightness = 0x00;
+	ret = blinkm_transfer_hw(client, BLM_FADE_HSB);
+	if (ret < 0)
+		dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
+
+	/* red fade to off */
+	data->next_red = 0xff;
+	ret = blinkm_transfer_hw(client, BLM_GO_RGB);
+	if (ret < 0)
+		dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
+
+	/* off */
+	data->next_red = 0x00;
+	ret = blinkm_transfer_hw(client, BLM_FADE_RGB);
+	if (ret < 0)
+		dev_err(&client->dev, "Failure in blinkm_remove ignored. Continuing.\n");
+
+	sysfs_remove_group(&client->dev.kobj, &blinkm_group);
+	return 0;
+}
+
+static const struct i2c_device_id blinkm_id[] = {
+	{"blinkm", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, blinkm_id);
+
+  /* This is the driver that will be inserted */
+static struct i2c_driver blinkm_driver = {
+	.class = I2C_CLASS_HWMON,
+	.driver = {
+		   .name = "blinkm",
+		   },
+	.probe = blinkm_probe,
+	.remove = blinkm_remove,
+	.id_table = blinkm_id,
+	.detect = blinkm_detect,
+	.address_list = normal_i2c,
+};
+
+module_i2c_driver(blinkm_driver);
+
+MODULE_AUTHOR("Jan-Simon Moeller <dl9pf@gmx.de>");
+MODULE_DESCRIPTION("BlinkM RGB LED driver");
+MODULE_LICENSE("GPL");
+

drivers/leds/leds-clevo-mail.c

@@ -0,0 +1,217 @@
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/leds.h>
+
+#include <linux/io.h>
+#include <linux/dmi.h>
+
+#include <linux/i8042.h>
+
+#define CLEVO_MAIL_LED_OFF		0x0084
+#define CLEVO_MAIL_LED_BLINK_1HZ	0x008A
+#define CLEVO_MAIL_LED_BLINK_0_5HZ	0x0083
+
+MODULE_AUTHOR("Márton Németh <nm127@freemail.hu>");
+MODULE_DESCRIPTION("Clevo mail LED driver");
+MODULE_LICENSE("GPL");
+
+static bool nodetect;
+module_param_named(nodetect, nodetect, bool, 0);
+MODULE_PARM_DESC(nodetect, "Skip DMI hardware detection");
+
+static struct platform_device *pdev;
+
+static int __init clevo_mail_led_dmi_callback(const struct dmi_system_id *id)
+{
+	pr_info("'%s' found\n", id->ident);
+	return 1;
+}
+
+/*
+ * struct clevo_mail_led_dmi_table - List of known good models
+ *
+ * Contains the known good models this driver is compatible with.
+ * When adding a new model try to be as strict as possible. This
+ * makes it possible to keep the false positives (the model is
+ * detected as working, but in reality it is not) as low as
+ * possible.
+ */
+static struct dmi_system_id clevo_mail_led_dmi_table[] __initdata = {
+	{
+		.callback = clevo_mail_led_dmi_callback,
+		.ident = "Clevo D410J",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "VIA"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "K8N800"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "VT8204B")
+		}
+	},
+	{
+		.callback = clevo_mail_led_dmi_callback,
+		.ident = "Clevo M5x0N",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "CLEVO Co."),
+			DMI_MATCH(DMI_PRODUCT_NAME, "M5x0N")
+		}
+	},
+	{
+		.callback = clevo_mail_led_dmi_callback,
+		.ident = "Clevo M5x0V",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "CLEVO Co. "),
+			DMI_MATCH(DMI_BOARD_NAME, "M5X0V "),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "VT6198")
+		}
+	},
+	{
+		.callback = clevo_mail_led_dmi_callback,
+		.ident = "Clevo D400P",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Clevo"),
+			DMI_MATCH(DMI_BOARD_NAME, "D400P"),
+			DMI_MATCH(DMI_BOARD_VERSION, "Rev.A"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "0106")
+		}
+	},
+	{
+		.callback = clevo_mail_led_dmi_callback,
+		.ident = "Clevo D410V",
+		.matches = {
+			DMI_MATCH(DMI_BOARD_VENDOR, "Clevo, Co."),
+			DMI_MATCH(DMI_BOARD_NAME, "D400V/D470V"),
+			DMI_MATCH(DMI_BOARD_VERSION, "SS78B"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Rev. A1")
+		}
+	},
+	{ }
+};
+MODULE_DEVICE_TABLE(dmi, clevo_mail_led_dmi_table);
+
+static void clevo_mail_led_set(struct led_classdev *led_cdev,
+				enum led_brightness value)
+{
+	i8042_lock_chip();
+
+	if (value == LED_OFF)
+		i8042_command(NULL, CLEVO_MAIL_LED_OFF);
+	else if (value <= LED_HALF)
+		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
+	else
+		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
+
+	i8042_unlock_chip();
+
+}
+
+static int clevo_mail_led_blink(struct led_classdev *led_cdev,
+				unsigned long *delay_on,
+				unsigned long *delay_off)
+{
+	int status = -EINVAL;
+
+	i8042_lock_chip();
+
+	if (*delay_on == 0 /* ms */ && *delay_off == 0 /* ms */) {
+		/* Special case: the leds subsystem requested us to
+		 * chose one user friendly blinking of the LED, and
+		 * start it. Let's blink the led slowly (0.5Hz).
+		 */
+		*delay_on = 1000; /* ms */
+		*delay_off = 1000; /* ms */
+		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
+		status = 0;
+
+	} else if (*delay_on == 500 /* ms */ && *delay_off == 500 /* ms */) {
+		/* blink the led with 1Hz */
+		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_1HZ);
+		status = 0;
+
+	} else if (*delay_on == 1000 /* ms */ && *delay_off == 1000 /* ms */) {
+		/* blink the led with 0.5Hz */
+		i8042_command(NULL, CLEVO_MAIL_LED_BLINK_0_5HZ);
+		status = 0;
+
+	} else {
+		pr_debug("clevo_mail_led_blink(..., %lu, %lu),"
+		       " returning -EINVAL (unsupported)\n",
+		       *delay_on, *delay_off);
+	}
+
+	i8042_unlock_chip();
+
+	return status;
+}
+
+static struct led_classdev clevo_mail_led = {
+	.name			= "clevo::mail",
+	.brightness_set		= clevo_mail_led_set,
+	.blink_set		= clevo_mail_led_blink,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static int __init clevo_mail_led_probe(struct platform_device *pdev)
+{
+	return led_classdev_register(&pdev->dev, &clevo_mail_led);
+}
+
+static int clevo_mail_led_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&clevo_mail_led);
+	return 0;
+}
+
+static struct platform_driver clevo_mail_led_driver = {
+	.remove		= clevo_mail_led_remove,
+	.driver		= {
+		.name		= KBUILD_MODNAME,
+		.owner		= THIS_MODULE,
+	},
+};
+
+static int __init clevo_mail_led_init(void)
+{
+	int error = 0;
+	int count = 0;
+
+	/* Check with the help of DMI if we are running on supported hardware */
+	if (!nodetect) {
+		count = dmi_check_system(clevo_mail_led_dmi_table);
+	} else {
+		count = 1;
+		pr_err("Skipping DMI detection. "
+		       "If the driver works on your hardware please "
+		       "report model and the output of dmidecode in tracker "
+		       "at http://sourceforge.net/projects/clevo-mailled/\n");
+	}
+
+	if (!count)
+		return -ENODEV;
+
+	pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
+	if (!IS_ERR(pdev)) {
+		error = platform_driver_probe(&clevo_mail_led_driver,
+					      clevo_mail_led_probe);
+		if (error) {
+			pr_err("Can't probe platform driver\n");
+			platform_device_unregister(pdev);
+		}
+	} else
+		error = PTR_ERR(pdev);
+
+	return error;
+}
+
+static void __exit clevo_mail_led_exit(void)
+{
+	platform_device_unregister(pdev);
+	platform_driver_unregister(&clevo_mail_led_driver);
+
+	clevo_mail_led_set(NULL, LED_OFF);
+}
+
+module_init(clevo_mail_led_init);
+module_exit(clevo_mail_led_exit);

drivers/leds/leds-cobalt-qube.c

@@ -0,0 +1,88 @@
+/*
+ * Copyright 2006 - Florian Fainelli <florian@openwrt.org>
+ *
+ * Control the Cobalt Qube/RaQ front LED
+ */
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+
+#define LED_FRONT_LEFT	0x01
+#define LED_FRONT_RIGHT	0x02
+
+static void __iomem *led_port;
+static u8 led_value;
+
+static void qube_front_led_set(struct led_classdev *led_cdev,
+			       enum led_brightness brightness)
+{
+	if (brightness)
+		led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
+	else
+		led_value = ~(LED_FRONT_LEFT | LED_FRONT_RIGHT);
+	writeb(led_value, led_port);
+}
+
+static struct led_classdev qube_front_led = {
+	.name			= "qube::front",
+	.brightness		= LED_FULL,
+	.brightness_set		= qube_front_led_set,
+	.default_trigger	= "default-on",
+};
+
+static int cobalt_qube_led_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	int retval;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EBUSY;
+
+	led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!led_port)
+		return -ENOMEM;
+
+	led_value = LED_FRONT_LEFT | LED_FRONT_RIGHT;
+	writeb(led_value, led_port);
+
+	retval = led_classdev_register(&pdev->dev, &qube_front_led);
+	if (retval)
+		goto err_null;
+
+	return 0;
+
+err_null:
+	led_port = NULL;
+
+	return retval;
+}
+
+static int cobalt_qube_led_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&qube_front_led);
+
+	if (led_port)
+		led_port = NULL;
+
+	return 0;
+}
+
+static struct platform_driver cobalt_qube_led_driver = {
+	.probe	= cobalt_qube_led_probe,
+	.remove	= cobalt_qube_led_remove,
+	.driver	= {
+		.name	= "cobalt-qube-leds",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(cobalt_qube_led_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Front LED support for Cobalt Server");
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_ALIAS("platform:cobalt-qube-leds");

drivers/leds/leds-cobalt-raq.c

@@ -0,0 +1,136 @@
+/*
+ *  LEDs driver for the Cobalt Raq series.
+ *
+ *  Copyright (C) 2007  Yoichi Yuasa <yuasa@linux-mips.org>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/types.h>
+#include <linux/export.h>
+
+#define LED_WEB		0x04
+#define LED_POWER_OFF	0x08
+
+static void __iomem *led_port;
+static u8 led_value;
+static DEFINE_SPINLOCK(led_value_lock);
+
+static void raq_web_led_set(struct led_classdev *led_cdev,
+			    enum led_brightness brightness)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&led_value_lock, flags);
+
+	if (brightness)
+		led_value |= LED_WEB;
+	else
+		led_value &= ~LED_WEB;
+	writeb(led_value, led_port);
+
+	spin_unlock_irqrestore(&led_value_lock, flags);
+}
+
+static struct led_classdev raq_web_led = {
+	.name		= "raq::web",
+	.brightness_set	= raq_web_led_set,
+};
+
+static void raq_power_off_led_set(struct led_classdev *led_cdev,
+				  enum led_brightness brightness)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&led_value_lock, flags);
+
+	if (brightness)
+		led_value |= LED_POWER_OFF;
+	else
+		led_value &= ~LED_POWER_OFF;
+	writeb(led_value, led_port);
+
+	spin_unlock_irqrestore(&led_value_lock, flags);
+}
+
+static struct led_classdev raq_power_off_led = {
+	.name			= "raq::power-off",
+	.brightness_set		= raq_power_off_led_set,
+	.default_trigger	= "power-off",
+};
+
+static int cobalt_raq_led_probe(struct platform_device *pdev)
+{
+	struct resource *res;
+	int retval;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -EBUSY;
+
+	led_port = devm_ioremap(&pdev->dev, res->start, resource_size(res));
+	if (!led_port)
+		return -ENOMEM;
+
+	retval = led_classdev_register(&pdev->dev, &raq_power_off_led);
+	if (retval)
+		goto err_null;
+
+	retval = led_classdev_register(&pdev->dev, &raq_web_led);
+	if (retval)
+		goto err_unregister;
+
+	return 0;
+
+err_unregister:
+	led_classdev_unregister(&raq_power_off_led);
+
+err_null:
+	led_port = NULL;
+
+	return retval;
+}
+
+static int cobalt_raq_led_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&raq_power_off_led);
+	led_classdev_unregister(&raq_web_led);
+
+	if (led_port)
+		led_port = NULL;
+
+	return 0;
+}
+
+static struct platform_driver cobalt_raq_led_driver = {
+	.probe	= cobalt_raq_led_probe,
+	.remove	= cobalt_raq_led_remove,
+	.driver = {
+		.name	= "cobalt-raq-leds",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init cobalt_raq_led_init(void)
+{
+	return platform_driver_register(&cobalt_raq_led_driver);
+}
+
+module_init(cobalt_raq_led_init);

drivers/leds/leds-da903x.c

@@ -0,0 +1,159 @@
+/*
+ * LEDs driver for Dialog Semiconductor DA9030/DA9034
+ *
+ * Copyright (C) 2008 Compulab, Ltd.
+ *	Mike Rapoport <mike@compulab.co.il>
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ *	Eric Miao <eric.miao@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/da903x.h>
+#include <linux/slab.h>
+
+#define DA9030_LED1_CONTROL	0x20
+#define DA9030_LED2_CONTROL	0x21
+#define DA9030_LED3_CONTROL	0x22
+#define DA9030_LED4_CONTROL	0x23
+#define DA9030_LEDPC_CONTROL	0x24
+#define DA9030_MISC_CONTROL_A	0x26	/* Vibrator Control */
+
+#define DA9034_LED1_CONTROL	0x35
+#define DA9034_LED2_CONTROL	0x36
+#define DA9034_VIBRA		0x40
+
+struct da903x_led {
+	struct led_classdev	cdev;
+	struct work_struct	work;
+	struct device		*master;
+	enum led_brightness	new_brightness;
+	int			id;
+	int			flags;
+};
+
+#define DA9030_LED_OFFSET(id)	((id) - DA9030_ID_LED_1)
+#define DA9034_LED_OFFSET(id)	((id) - DA9034_ID_LED_1)
+
+static void da903x_led_work(struct work_struct *work)
+{
+	struct da903x_led *led = container_of(work, struct da903x_led, work);
+	uint8_t val;
+	int offset;
+
+	switch (led->id) {
+	case DA9030_ID_LED_1:
+	case DA9030_ID_LED_2:
+	case DA9030_ID_LED_3:
+	case DA9030_ID_LED_4:
+	case DA9030_ID_LED_PC:
+		offset = DA9030_LED_OFFSET(led->id);
+		val = led->flags & ~0x87;
+		val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
+		val |= (0x7 - (led->new_brightness >> 5)) & 0x7; /* PWM<2:0> */
+		da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
+		break;
+	case DA9030_ID_VIBRA:
+		val = led->flags & ~0x80;
+		val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
+		da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
+		break;
+	case DA9034_ID_LED_1:
+	case DA9034_ID_LED_2:
+		offset = DA9034_LED_OFFSET(led->id);
+		val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
+		val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
+		da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
+		break;
+	case DA9034_ID_VIBRA:
+		val = led->new_brightness & 0xfe;
+		da903x_write(led->master, DA9034_VIBRA, val);
+		break;
+	}
+}
+
+static void da903x_led_set(struct led_classdev *led_cdev,
+			   enum led_brightness value)
+{
+	struct da903x_led *led;
+
+	led = container_of(led_cdev, struct da903x_led, cdev);
+	led->new_brightness = value;
+	schedule_work(&led->work);
+}
+
+static int da903x_led_probe(struct platform_device *pdev)
+{
+	struct led_info *pdata = dev_get_platdata(&pdev->dev);
+	struct da903x_led *led;
+	int id, ret;
+
+	if (pdata == NULL)
+		return 0;
+
+	id = pdev->id;
+
+	if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
+	      (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
+		dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
+		return -EINVAL;
+	}
+
+	led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	led->cdev.name = pdata->name;
+	led->cdev.default_trigger = pdata->default_trigger;
+	led->cdev.brightness_set = da903x_led_set;
+	led->cdev.brightness = LED_OFF;
+
+	led->id = id;
+	led->flags = pdata->flags;
+	led->master = pdev->dev.parent;
+	led->new_brightness = LED_OFF;
+
+	INIT_WORK(&led->work, da903x_led_work);
+
+	ret = led_classdev_register(led->master, &led->cdev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register LED %d\n", id);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, led);
+	return 0;
+}
+
+static int da903x_led_remove(struct platform_device *pdev)
+{
+	struct da903x_led *led = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&led->cdev);
+	return 0;
+}
+
+static struct platform_driver da903x_led_driver = {
+	.driver	= {
+		.name	= "da903x-led",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= da903x_led_probe,
+	.remove		= da903x_led_remove,
+};
+
+module_platform_driver(da903x_led_driver);
+
+MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
+MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
+MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:da903x-led");

drivers/leds/leds-da9052.c

@@ -0,0 +1,212 @@
+/*
+ * LED Driver for Dialog DA9052 PMICs.
+ *
+ * Copyright(c) 2012 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/da9052/reg.h>
+#include <linux/mfd/da9052/da9052.h>
+#include <linux/mfd/da9052/pdata.h>
+
+#define DA9052_OPENDRAIN_OUTPUT	2
+#define DA9052_SET_HIGH_LVL_OUTPUT	(1 << 3)
+#define DA9052_MASK_UPPER_NIBBLE	0xF0
+#define DA9052_MASK_LOWER_NIBBLE	0x0F
+#define DA9052_NIBBLE_SHIFT		4
+#define DA9052_MAX_BRIGHTNESS		0x5f
+
+struct da9052_led {
+	struct led_classdev cdev;
+	struct work_struct work;
+	struct da9052 *da9052;
+	unsigned char led_index;
+	unsigned char id;
+	int brightness;
+};
+
+static unsigned char led_reg[] = {
+	DA9052_LED_CONT_4_REG,
+	DA9052_LED_CONT_5_REG,
+};
+
+static int da9052_set_led_brightness(struct da9052_led *led)
+{
+	u8 val;
+	int error;
+
+	val = (led->brightness & 0x7f) | DA9052_LED_CONT_DIM;
+
+	error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
+	if (error < 0)
+		dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
+			error);
+	return error;
+}
+
+static void da9052_led_work(struct work_struct *work)
+{
+	struct da9052_led *led = container_of(work, struct da9052_led, work);
+
+	da9052_set_led_brightness(led);
+}
+
+static void da9052_led_set(struct led_classdev *led_cdev,
+			   enum led_brightness value)
+{
+	struct da9052_led *led;
+
+	led = container_of(led_cdev, struct da9052_led, cdev);
+	led->brightness = value;
+	schedule_work(&led->work);
+}
+
+static int da9052_configure_leds(struct da9052 *da9052)
+{
+	int error;
+	unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
+				       | DA9052_SET_HIGH_LVL_OUTPUT;
+
+	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
+				  DA9052_MASK_LOWER_NIBBLE,
+				  register_value);
+
+	if (error < 0) {
+		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
+			error);
+		return error;
+	}
+
+	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
+				  DA9052_MASK_UPPER_NIBBLE,
+				  register_value << DA9052_NIBBLE_SHIFT);
+	if (error < 0)
+		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
+			error);
+
+	return error;
+}
+
+static int da9052_led_probe(struct platform_device *pdev)
+{
+	struct da9052_pdata *pdata;
+	struct da9052 *da9052;
+	struct led_platform_data *pled;
+	struct da9052_led *led = NULL;
+	int error = -ENODEV;
+	int i;
+
+	da9052 = dev_get_drvdata(pdev->dev.parent);
+	pdata = dev_get_platdata(da9052->dev);
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "No platform data\n");
+		goto err;
+	}
+
+	pled = pdata->pled;
+	if (pled == NULL) {
+		dev_err(&pdev->dev, "No platform data for LED\n");
+		goto err;
+	}
+
+	led = devm_kzalloc(&pdev->dev,
+			   sizeof(struct da9052_led) * pled->num_leds,
+			   GFP_KERNEL);
+	if (!led) {
+		error = -ENOMEM;
+		goto err;
+	}
+
+	for (i = 0; i < pled->num_leds; i++) {
+		led[i].cdev.name = pled->leds[i].name;
+		led[i].cdev.brightness_set = da9052_led_set;
+		led[i].cdev.brightness = LED_OFF;
+		led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
+		led[i].brightness = LED_OFF;
+		led[i].led_index = pled->leds[i].flags;
+		led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
+		INIT_WORK(&led[i].work, da9052_led_work);
+
+		error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
+		if (error) {
+			dev_err(&pdev->dev, "Failed to register led %d\n",
+				led[i].led_index);
+			goto err_register;
+		}
+
+		error = da9052_set_led_brightness(&led[i]);
+		if (error) {
+			dev_err(&pdev->dev, "Unable to init led %d\n",
+				led[i].led_index);
+			continue;
+		}
+	}
+	error = da9052_configure_leds(led->da9052);
+	if (error) {
+		dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
+		goto err_register;
+	}
+
+	platform_set_drvdata(pdev, led);
+
+	return 0;
+
+err_register:
+	for (i = i - 1; i >= 0; i--) {
+		led_classdev_unregister(&led[i].cdev);
+		cancel_work_sync(&led[i].work);
+	}
+err:
+	return error;
+}
+
+static int da9052_led_remove(struct platform_device *pdev)
+{
+	struct da9052_led *led = platform_get_drvdata(pdev);
+	struct da9052_pdata *pdata;
+	struct da9052 *da9052;
+	struct led_platform_data *pled;
+	int i;
+
+	da9052 = dev_get_drvdata(pdev->dev.parent);
+	pdata = dev_get_platdata(da9052->dev);
+	pled = pdata->pled;
+
+	for (i = 0; i < pled->num_leds; i++) {
+		led[i].brightness = 0;
+		da9052_set_led_brightness(&led[i]);
+		led_classdev_unregister(&led[i].cdev);
+		cancel_work_sync(&led[i].work);
+	}
+
+	return 0;
+}
+
+static struct platform_driver da9052_led_driver = {
+	.driver		= {
+		.name	= "da9052-leds",
+		.owner	= THIS_MODULE,
+	},
+	.probe		= da9052_led_probe,
+	.remove		= da9052_led_remove,
+};
+
+module_platform_driver(da9052_led_driver);
+
+MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
+MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL");

drivers/leds/leds-dac124s085.c

@@ -0,0 +1,134 @@
+/*
+ * Copyright 2008
+ * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License.  See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * LED driver for the DAC124S085 SPI DAC
+ */
+
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/spi/spi.h>
+
+struct dac124s085_led {
+	struct led_classdev	ldev;
+	struct spi_device	*spi;
+	int			id;
+	int			brightness;
+	char			name[sizeof("dac124s085-3")];
+
+	struct mutex		mutex;
+	struct work_struct	work;
+	spinlock_t		lock;
+};
+
+struct dac124s085 {
+	struct dac124s085_led leds[4];
+};
+
+#define REG_WRITE		(0 << 12)
+#define REG_WRITE_UPDATE	(1 << 12)
+#define ALL_WRITE_UPDATE	(2 << 12)
+#define POWER_DOWN_OUTPUT	(3 << 12)
+
+static void dac124s085_led_work(struct work_struct *work)
+{
+	struct dac124s085_led *led = container_of(work, struct dac124s085_led,
+						  work);
+	u16 word;
+
+	mutex_lock(&led->mutex);
+	word = cpu_to_le16(((led->id) << 14) | REG_WRITE_UPDATE |
+			   (led->brightness & 0xfff));
+	spi_write(led->spi, (const u8 *)&word, sizeof(word));
+	mutex_unlock(&led->mutex);
+}
+
+static void dac124s085_set_brightness(struct led_classdev *ldev,
+				      enum led_brightness brightness)
+{
+	struct dac124s085_led *led = container_of(ldev, struct dac124s085_led,
+						  ldev);
+
+	spin_lock(&led->lock);
+	led->brightness = brightness;
+	schedule_work(&led->work);
+	spin_unlock(&led->lock);
+}
+
+static int dac124s085_probe(struct spi_device *spi)
+{
+	struct dac124s085	*dac;
+	struct dac124s085_led	*led;
+	int i, ret;
+
+	dac = devm_kzalloc(&spi->dev, sizeof(*dac), GFP_KERNEL);
+	if (!dac)
+		return -ENOMEM;
+
+	spi->bits_per_word = 16;
+
+	for (i = 0; i < ARRAY_SIZE(dac->leds); i++) {
+		led		= dac->leds + i;
+		led->id		= i;
+		led->brightness	= LED_OFF;
+		led->spi	= spi;
+		snprintf(led->name, sizeof(led->name), "dac124s085-%d", i);
+		spin_lock_init(&led->lock);
+		INIT_WORK(&led->work, dac124s085_led_work);
+		mutex_init(&led->mutex);
+		led->ldev.name = led->name;
+		led->ldev.brightness = LED_OFF;
+		led->ldev.max_brightness = 0xfff;
+		led->ldev.brightness_set = dac124s085_set_brightness;
+		ret = led_classdev_register(&spi->dev, &led->ldev);
+		if (ret < 0)
+			goto eledcr;
+	}
+
+	spi_set_drvdata(spi, dac);
+
+	return 0;
+
+eledcr:
+	while (i--)
+		led_classdev_unregister(&dac->leds[i].ldev);
+
+	return ret;
+}
+
+static int dac124s085_remove(struct spi_device *spi)
+{
+	struct dac124s085	*dac = spi_get_drvdata(spi);
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dac->leds); i++) {
+		led_classdev_unregister(&dac->leds[i].ldev);
+		cancel_work_sync(&dac->leds[i].work);
+	}
+
+	return 0;
+}
+
+static struct spi_driver dac124s085_driver = {
+	.probe		= dac124s085_probe,
+	.remove		= dac124s085_remove,
+	.driver = {
+		.name	= "dac124s085",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_spi_driver(dac124s085_driver);
+
+MODULE_AUTHOR("Guennadi Liakhovetski <lg@denx.de>");
+MODULE_DESCRIPTION("DAC124S085 LED driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("spi:dac124s085");

drivers/leds/leds-fsg.c

@@ -0,0 +1,225 @@
+/*
+ * LED Driver for the Freecom FSG-3
+ *
+ * Copyright (c) 2008 Rod Whitby <rod@whitby.id.au>
+ *
+ * Author: Rod Whitby <rod@whitby.id.au>
+ *
+ * Based on leds-spitz.c
+ * Copyright 2005-2006 Openedhand Ltd.
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <mach/hardware.h>
+
+#define FSG_LED_WLAN_BIT	0
+#define FSG_LED_WAN_BIT		1
+#define FSG_LED_SATA_BIT	2
+#define FSG_LED_USB_BIT		4
+#define FSG_LED_RING_BIT	5
+#define FSG_LED_SYNC_BIT	7
+
+static short __iomem *latch_address;
+static unsigned short latch_value;
+
+
+static void fsg_led_wlan_set(struct led_classdev *led_cdev,
+			     enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_WLAN_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_WLAN_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_wan_set(struct led_classdev *led_cdev,
+			    enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_WAN_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_WAN_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_sata_set(struct led_classdev *led_cdev,
+			     enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_SATA_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_SATA_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_usb_set(struct led_classdev *led_cdev,
+			    enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_USB_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_USB_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_sync_set(struct led_classdev *led_cdev,
+			     enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_SYNC_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_SYNC_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+static void fsg_led_ring_set(struct led_classdev *led_cdev,
+			     enum led_brightness value)
+{
+	if (value) {
+		latch_value &= ~(1 << FSG_LED_RING_BIT);
+		*latch_address = latch_value;
+	} else {
+		latch_value |=  (1 << FSG_LED_RING_BIT);
+		*latch_address = latch_value;
+	}
+}
+
+
+static struct led_classdev fsg_wlan_led = {
+	.name			= "fsg:blue:wlan",
+	.brightness_set		= fsg_led_wlan_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static struct led_classdev fsg_wan_led = {
+	.name			= "fsg:blue:wan",
+	.brightness_set		= fsg_led_wan_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static struct led_classdev fsg_sata_led = {
+	.name			= "fsg:blue:sata",
+	.brightness_set		= fsg_led_sata_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static struct led_classdev fsg_usb_led = {
+	.name			= "fsg:blue:usb",
+	.brightness_set		= fsg_led_usb_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static struct led_classdev fsg_sync_led = {
+	.name			= "fsg:blue:sync",
+	.brightness_set		= fsg_led_sync_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static struct led_classdev fsg_ring_led = {
+	.name			= "fsg:blue:ring",
+	.brightness_set		= fsg_led_ring_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+
+static int fsg_led_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	/* Map the LED chip select address space */
+	latch_address = (unsigned short *) devm_ioremap(&pdev->dev,
+						IXP4XX_EXP_BUS_BASE(2), 512);
+	if (!latch_address)
+		return -ENOMEM;
+
+	latch_value = 0xffff;
+	*latch_address = latch_value;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_wlan_led);
+	if (ret < 0)
+		goto failwlan;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_wan_led);
+	if (ret < 0)
+		goto failwan;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_sata_led);
+	if (ret < 0)
+		goto failsata;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_usb_led);
+	if (ret < 0)
+		goto failusb;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_sync_led);
+	if (ret < 0)
+		goto failsync;
+
+	ret = led_classdev_register(&pdev->dev, &fsg_ring_led);
+	if (ret < 0)
+		goto failring;
+
+	return ret;
+
+ failring:
+	led_classdev_unregister(&fsg_sync_led);
+ failsync:
+	led_classdev_unregister(&fsg_usb_led);
+ failusb:
+	led_classdev_unregister(&fsg_sata_led);
+ failsata:
+	led_classdev_unregister(&fsg_wan_led);
+ failwan:
+	led_classdev_unregister(&fsg_wlan_led);
+ failwlan:
+
+	return ret;
+}
+
+static int fsg_led_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&fsg_wlan_led);
+	led_classdev_unregister(&fsg_wan_led);
+	led_classdev_unregister(&fsg_sata_led);
+	led_classdev_unregister(&fsg_usb_led);
+	led_classdev_unregister(&fsg_sync_led);
+	led_classdev_unregister(&fsg_ring_led);
+
+	return 0;
+}
+
+
+static struct platform_driver fsg_led_driver = {
+	.probe		= fsg_led_probe,
+	.remove		= fsg_led_remove,
+	.driver		= {
+		.name		= "fsg-led",
+	},
+};
+
+module_platform_driver(fsg_led_driver);
+
+MODULE_AUTHOR("Rod Whitby <rod@whitby.id.au>");
+MODULE_DESCRIPTION("Freecom FSG-3 LED driver");
+MODULE_LICENSE("GPL");

drivers/leds/leds-gpio-register.c

@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2011 Pengutronix
+ * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ */
+#include <linux/err.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/**
+ * gpio_led_register_device - register a gpio-led device
+ * @pdata: the platform data used for the new device
+ *
+ * Makes a copy of pdata and pdata->leds and registers a new leds-gpio device
+ * with the result. This allows to have pdata and pdata-leds in .init.rodata
+ * and so saves some bytes compared to a static struct platform_device with
+ * static platform data.
+ *
+ * Returns the registered device or an error pointer.
+ */
+struct platform_device *__init gpio_led_register_device(
+		int id, const struct gpio_led_platform_data *pdata)
+{
+	struct platform_device *ret;
+	struct gpio_led_platform_data _pdata = *pdata;
+
+	if (!pdata->num_leds)
+		return ERR_PTR(-EINVAL);
+
+	_pdata.leds = kmemdup(pdata->leds,
+			pdata->num_leds * sizeof(*pdata->leds), GFP_KERNEL);
+	if (!_pdata.leds)
+		return ERR_PTR(-ENOMEM);
+
+	ret = platform_device_register_resndata(NULL, "leds-gpio", id,
+			NULL, 0, &_pdata, sizeof(_pdata));
+	if (IS_ERR(ret))
+		kfree(_pdata.leds);
+
+	return ret;
+}

drivers/leds/leds-gpio.c

@@ -0,0 +1,300 @@
+/*
+ * LEDs driver for GPIOs
+ *
+ * Copyright (C) 2007 8D Technologies inc.
+ * Raphael Assenat <raph@8d.com>
+ * Copyright (C) 2008 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+struct gpio_led_data {
+	struct led_classdev cdev;
+	unsigned gpio;
+	struct work_struct work;
+	u8 new_level;
+	u8 can_sleep;
+	u8 active_low;
+	u8 blinking;
+	int (*platform_gpio_blink_set)(unsigned gpio, int state,
+			unsigned long *delay_on, unsigned long *delay_off);
+};
+
+static void gpio_led_work(struct work_struct *work)
+{
+	struct gpio_led_data *led_dat =
+		container_of(work, struct gpio_led_data, work);
+
+	if (led_dat->blinking) {
+		led_dat->platform_gpio_blink_set(led_dat->gpio,
+						 led_dat->new_level,
+						 NULL, NULL);
+		led_dat->blinking = 0;
+	} else
+		gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
+}
+
+static void gpio_led_set(struct led_classdev *led_cdev,
+	enum led_brightness value)
+{
+	struct gpio_led_data *led_dat =
+		container_of(led_cdev, struct gpio_led_data, cdev);
+	int level;
+
+	if (value == LED_OFF)
+		level = 0;
+	else
+		level = 1;
+
+	if (led_dat->active_low)
+		level = !level;
+
+	/* Setting GPIOs with I2C/etc requires a task context, and we don't
+	 * seem to have a reliable way to know if we're already in one; so
+	 * let's just assume the worst.
+	 */
+	if (led_dat->can_sleep) {
+		led_dat->new_level = level;
+		schedule_work(&led_dat->work);
+	} else {
+		if (led_dat->blinking) {
+			led_dat->platform_gpio_blink_set(led_dat->gpio, level,
+							 NULL, NULL);
+			led_dat->blinking = 0;
+		} else
+			gpio_set_value(led_dat->gpio, level);
+	}
+}
+
+static int gpio_blink_set(struct led_classdev *led_cdev,
+	unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct gpio_led_data *led_dat =
+		container_of(led_cdev, struct gpio_led_data, cdev);
+
+	led_dat->blinking = 1;
+	return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK,
+						delay_on, delay_off);
+}
+
+static int create_gpio_led(const struct gpio_led *template,
+	struct gpio_led_data *led_dat, struct device *parent,
+	int (*blink_set)(unsigned, int, unsigned long *, unsigned long *))
+{
+	int ret, state;
+
+	led_dat->gpio = -1;
+
+	/* skip leds that aren't available */
+	if (!gpio_is_valid(template->gpio)) {
+		dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",
+				template->gpio, template->name);
+		return 0;
+	}
+
+	ret = devm_gpio_request(parent, template->gpio, template->name);
+	if (ret < 0)
+		return ret;
+
+	led_dat->cdev.name = template->name;
+	led_dat->cdev.default_trigger = template->default_trigger;
+	led_dat->gpio = template->gpio;
+	led_dat->can_sleep = gpio_cansleep(template->gpio);
+	led_dat->active_low = template->active_low;
+	led_dat->blinking = 0;
+	if (blink_set) {
+		led_dat->platform_gpio_blink_set = blink_set;
+		led_dat->cdev.blink_set = gpio_blink_set;
+	}
+	led_dat->cdev.brightness_set = gpio_led_set;
+	if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
+		state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low;
+	else
+		state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
+	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
+	if (!template->retain_state_suspended)
+		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+
+	ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
+	if (ret < 0)
+		return ret;
+
+	INIT_WORK(&led_dat->work, gpio_led_work);
+
+	ret = led_classdev_register(parent, &led_dat->cdev);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static void delete_gpio_led(struct gpio_led_data *led)
+{
+	if (!gpio_is_valid(led->gpio))
+		return;
+	led_classdev_unregister(&led->cdev);
+	cancel_work_sync(&led->work);
+}
+
+struct gpio_leds_priv {
+	int num_leds;
+	struct gpio_led_data leds[];
+};
+
+static inline int sizeof_gpio_leds_priv(int num_leds)
+{
+	return sizeof(struct gpio_leds_priv) +
+		(sizeof(struct gpio_led_data) * num_leds);
+}
+
+/* Code to create from OpenFirmware platform devices */
+#ifdef CONFIG_OF_GPIO
+static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node, *child;
+	struct gpio_leds_priv *priv;
+	int count, ret;
+
+	/* count LEDs in this device, so we know how much to allocate */
+	count = of_get_available_child_count(np);
+	if (!count)
+		return ERR_PTR(-ENODEV);
+
+	for_each_available_child_of_node(np, child)
+		if (of_get_gpio(child, 0) == -EPROBE_DEFER)
+			return ERR_PTR(-EPROBE_DEFER);
+
+	priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count),
+			GFP_KERNEL);
+	if (!priv)
+		return ERR_PTR(-ENOMEM);
+
+	for_each_available_child_of_node(np, child) {
+		struct gpio_led led = {};
+		enum of_gpio_flags flags;
+		const char *state;
+
+		led.gpio = of_get_gpio_flags(child, 0, &flags);
+		led.active_low = flags & OF_GPIO_ACTIVE_LOW;
+		led.name = of_get_property(child, "label", NULL) ? : child->name;
+		led.default_trigger =
+			of_get_property(child, "linux,default-trigger", NULL);
+		state = of_get_property(child, "default-state", NULL);
+		if (state) {
+			if (!strcmp(state, "keep"))
+				led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
+			else if (!strcmp(state, "on"))
+				led.default_state = LEDS_GPIO_DEFSTATE_ON;
+			else
+				led.default_state = LEDS_GPIO_DEFSTATE_OFF;
+		}
+
+		if (of_get_property(child, "retain-state-suspended", NULL))
+			led.retain_state_suspended = 1;
+
+		ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
+				      &pdev->dev, NULL);
+		if (ret < 0) {
+			of_node_put(child);
+			goto err;
+		}
+	}
+
+	return priv;
+
+err:
+	for (count = priv->num_leds - 2; count >= 0; count--)
+		delete_gpio_led(&priv->leds[count]);
+	return ERR_PTR(-ENODEV);
+}
+
+static const struct of_device_id of_gpio_leds_match[] = {
+	{ .compatible = "gpio-leds", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, of_gpio_leds_match);
+#else /* CONFIG_OF_GPIO */
+static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
+{
+	return ERR_PTR(-ENODEV);
+}
+#endif /* CONFIG_OF_GPIO */
+
+static int gpio_led_probe(struct platform_device *pdev)
+{
+	struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct gpio_leds_priv *priv;
+	int i, ret = 0;
+
+	if (pdata && pdata->num_leds) {
+		priv = devm_kzalloc(&pdev->dev,
+				sizeof_gpio_leds_priv(pdata->num_leds),
+					GFP_KERNEL);
+		if (!priv)
+			return -ENOMEM;
+
+		priv->num_leds = pdata->num_leds;
+		for (i = 0; i < priv->num_leds; i++) {
+			ret = create_gpio_led(&pdata->leds[i],
+					      &priv->leds[i],
+					      &pdev->dev, pdata->gpio_blink_set);
+			if (ret < 0) {
+				/* On failure: unwind the led creations */
+				for (i = i - 1; i >= 0; i--)
+					delete_gpio_led(&priv->leds[i]);
+				return ret;
+			}
+		}
+	} else {
+		priv = gpio_leds_create_of(pdev);
+		if (IS_ERR(priv))
+			return PTR_ERR(priv);
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	return 0;
+}
+
+static int gpio_led_remove(struct platform_device *pdev)
+{
+	struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < priv->num_leds; i++)
+		delete_gpio_led(&priv->leds[i]);
+
+	return 0;
+}
+
+static struct platform_driver gpio_led_driver = {
+	.probe		= gpio_led_probe,
+	.remove		= gpio_led_remove,
+	.driver		= {
+		.name	= "leds-gpio",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(of_gpio_leds_match),
+	},
+};
+
+module_platform_driver(gpio_led_driver);
+
+MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
+MODULE_DESCRIPTION("GPIO LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-gpio");

drivers/leds/leds-hp6xx.c

@@ -0,0 +1,95 @@
+/*
+ * LED Triggers Core
+ * For the HP Jornada 620/660/680/690 handhelds
+ *
+ * Copyright 2008 Kristoffer Ericson <kristoffer.ericson@gmail.com>
+ *     this driver is based on leds-spitz.c by Richard Purdie.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <asm/hd64461.h>
+#include <mach/hp6xx.h>
+
+static void hp6xxled_green_set(struct led_classdev *led_cdev,
+			       enum led_brightness value)
+{
+	u8 v8;
+
+	v8 = inb(PKDR);
+	if (value)
+		outb(v8 & (~PKDR_LED_GREEN), PKDR);
+	else
+		outb(v8 | PKDR_LED_GREEN, PKDR);
+}
+
+static void hp6xxled_red_set(struct led_classdev *led_cdev,
+			     enum led_brightness value)
+{
+	u16 v16;
+
+	v16 = inw(HD64461_GPBDR);
+	if (value)
+		outw(v16 & (~HD64461_GPBDR_LED_RED), HD64461_GPBDR);
+	else
+		outw(v16 | HD64461_GPBDR_LED_RED, HD64461_GPBDR);
+}
+
+static struct led_classdev hp6xx_red_led = {
+	.name			= "hp6xx:red",
+	.default_trigger	= "hp6xx-charge",
+	.brightness_set		= hp6xxled_red_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static struct led_classdev hp6xx_green_led = {
+	.name			= "hp6xx:green",
+	.default_trigger	= "ide-disk",
+	.brightness_set		= hp6xxled_green_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static int hp6xxled_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = led_classdev_register(&pdev->dev, &hp6xx_red_led);
+	if (ret < 0)
+		return ret;
+
+	ret = led_classdev_register(&pdev->dev, &hp6xx_green_led);
+	if (ret < 0)
+		led_classdev_unregister(&hp6xx_red_led);
+
+	return ret;
+}
+
+static int hp6xxled_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&hp6xx_red_led);
+	led_classdev_unregister(&hp6xx_green_led);
+
+	return 0;
+}
+
+static struct platform_driver hp6xxled_driver = {
+	.probe		= hp6xxled_probe,
+	.remove		= hp6xxled_remove,
+	.driver		= {
+		.name		= "hp6xx-led",
+		.owner		= THIS_MODULE,
+	},
+};
+
+module_platform_driver(hp6xxled_driver);
+
+MODULE_AUTHOR("Kristoffer Ericson <kristoffer.ericson@gmail.com>");
+MODULE_DESCRIPTION("HP Jornada 6xx LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:hp6xx-led");

drivers/leds/leds-ipaq-micro.c

@@ -0,0 +1,141 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * h3xxx atmel micro companion support, notification LED subdevice
+ *
+ * Author : Linus Walleij <linus.walleij@linaro.org>
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/ipaq-micro.h>
+#include <linux/leds.h>
+
+#define LED_YELLOW	0x00
+#define LED_GREEN	0x01
+
+#define LED_EN          (1 << 4)        /* LED ON/OFF 0:off, 1:on                       */
+#define LED_AUTOSTOP    (1 << 5)        /* LED ON/OFF auto stop set 0:disable, 1:enable */
+#define LED_ALWAYS      (1 << 6)        /* LED Interrupt Mask 0:No mask, 1:mask         */
+
+static void micro_leds_brightness_set(struct led_classdev *led_cdev,
+				      enum led_brightness value)
+{
+	struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
+	/*
+	 * In this message:
+	 * Byte 0 = LED color: 0 = yellow, 1 = green
+	 *          yellow LED is always ~30 blinks per minute
+	 * Byte 1 = duration (flags?) appears to be ignored
+	 * Byte 2 = green ontime in 1/10 sec (deciseconds)
+	 *          1 = 1/10 second
+	 *          0 = 256/10 second
+	 * Byte 3 = green offtime in 1/10 sec (deciseconds)
+	 *          1 = 1/10 second
+	 *          0 = 256/10 seconds
+	 */
+	struct ipaq_micro_msg msg = {
+		.id = MSG_NOTIFY_LED,
+		.tx_len = 4,
+	};
+
+	msg.tx_data[0] = LED_GREEN;
+	msg.tx_data[1] = 0;
+	if (value) {
+		msg.tx_data[2] = 0; /* Duty cycle 256 */
+		msg.tx_data[3] = 1;
+	} else {
+		msg.tx_data[2] = 1;
+		msg.tx_data[3] = 0; /* Duty cycle 256 */
+	}
+	ipaq_micro_tx_msg_sync(micro, &msg);
+}
+
+/* Maximum duty cycle in ms 256/10 sec = 25600 ms */
+#define IPAQ_LED_MAX_DUTY 25600
+
+static int micro_leds_blink_set(struct led_classdev *led_cdev,
+				unsigned long *delay_on,
+				unsigned long *delay_off)
+{
+	struct ipaq_micro *micro = dev_get_drvdata(led_cdev->dev->parent->parent);
+	/*
+	 * In this message:
+	 * Byte 0 = LED color: 0 = yellow, 1 = green
+	 *          yellow LED is always ~30 blinks per minute
+	 * Byte 1 = duration (flags?) appears to be ignored
+	 * Byte 2 = green ontime in 1/10 sec (deciseconds)
+	 *          1 = 1/10 second
+	 *          0 = 256/10 second
+	 * Byte 3 = green offtime in 1/10 sec (deciseconds)
+	 *          1 = 1/10 second
+	 *          0 = 256/10 seconds
+	 */
+	struct ipaq_micro_msg msg = {
+		.id = MSG_NOTIFY_LED,
+		.tx_len = 4,
+	};
+
+	msg.tx_data[0] = LED_GREEN;
+        if (*delay_on > IPAQ_LED_MAX_DUTY ||
+	    *delay_off > IPAQ_LED_MAX_DUTY)
+                return -EINVAL;
+
+        if (*delay_on == 0 && *delay_off == 0) {
+                *delay_on = 100;
+                *delay_off = 100;
+        }
+
+	msg.tx_data[1] = 0;
+	if (*delay_on >= IPAQ_LED_MAX_DUTY)
+		msg.tx_data[2] = 0;
+	else
+		msg.tx_data[2] = (u8) DIV_ROUND_CLOSEST(*delay_on, 100);
+	if (*delay_off >= IPAQ_LED_MAX_DUTY)
+		msg.tx_data[3] = 0;
+	else
+		msg.tx_data[3] = (u8) DIV_ROUND_CLOSEST(*delay_off, 100);
+	return ipaq_micro_tx_msg_sync(micro, &msg);
+}
+
+static struct led_classdev micro_led = {
+	.name			= "led-ipaq-micro",
+	.brightness_set		= micro_leds_brightness_set,
+	.blink_set		= micro_leds_blink_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static int micro_leds_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = led_classdev_register(&pdev->dev, &micro_led);
+	if (ret) {
+		dev_err(&pdev->dev, "registering led failed: %d\n", ret);
+		return ret;
+	}
+	dev_info(&pdev->dev, "iPAQ micro notification LED driver\n");
+
+	return 0;
+}
+
+static int micro_leds_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&micro_led);
+	return 0;
+}
+
+static struct platform_driver micro_leds_device_driver = {
+	.driver = {
+		.name    = "ipaq-micro-leds",
+	},
+	.probe   = micro_leds_probe,
+	.remove  = micro_leds_remove,
+};
+module_platform_driver(micro_leds_device_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("driver for iPAQ Atmel micro leds");
+MODULE_ALIAS("platform:ipaq-micro-leds");

drivers/leds/leds-ktd2692.c

@@ -0,0 +1,388 @@
+/*
+ * LED driver - leds-ktd2692.c
+ *
+ * Copyright (C) 2013 Sunggeun Yim <sunggeun.yim@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/pwm.h>
+#include <linux/vmalloc.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/leds-ktd2692.h>
+#ifdef CONFIG_OF
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#endif
+
+extern struct class *camera_class; /*sys/class/camera*/
+struct device *ktd2692_dev;
+
+struct ktd2692_platform_data *global_ktd2692data = NULL;
+struct device *global_dev;
+
+void ktd2692_setGpio(int onoff)
+{
+	if (onoff) {
+		__gpio_set_value(global_ktd2692data->flash_control, 1);
+	} else {
+		__gpio_set_value(global_ktd2692data->flash_control, 0);
+	}
+}
+
+void ktd2692_set_low_bit(void)
+{
+	__gpio_set_value(global_ktd2692data->flash_control, 0);
+	ndelay(T_L_LB*1000);	/* 12ms */
+	__gpio_set_value(global_ktd2692data->flash_control, 1);
+	ndelay(T_H_LB*1000);	/* 4ms */
+}
+
+void ktd2692_set_high_bit(void)
+{
+	__gpio_set_value(global_ktd2692data->flash_control, 0);
+	ndelay(T_L_HB*1000);	/* 4ms */
+	__gpio_set_value(global_ktd2692data->flash_control, 1);
+	ndelay(T_H_HB*1000);	/* 12ms */
+}
+
+static int ktd2692_set_bit(unsigned int bit)
+{
+	if (bit) {
+		ktd2692_set_high_bit();
+	} else {
+		ktd2692_set_low_bit();
+	}
+	return 0;
+}
+
+static int ktd2692_write_data(unsigned data)
+{
+	int err = 0;
+	unsigned int bit = 0;
+
+	/* Data Start Condition */
+	__gpio_set_value(global_ktd2692data->flash_control, 1);
+	ndelay(T_SOD*1000); //15us
+
+	/* BIT 7*/
+	bit = ((data>> 7) & 0x01);
+	ktd2692_set_bit(bit);
+
+	/* BIT 6 */
+	bit = ((data>> 6) & 0x01);
+	ktd2692_set_bit(bit);
+
+	/* BIT 5*/
+	bit = ((data>> 5) & 0x01);
+	ktd2692_set_bit(bit);
+
+	/* BIT 4 */
+	bit = ((data>> 4) & 0x01);
+	ktd2692_set_bit(bit);
+
+	/* BIT 3*/
+	bit = ((data>> 3) & 0x01);
+	ktd2692_set_bit(bit);
+
+	/* BIT 2 */
+	bit = ((data>> 2) & 0x01);
+	ktd2692_set_bit(bit);
+
+	/* BIT 1*/
+	bit = ((data>> 1) & 0x01);
+	ktd2692_set_bit(bit);
+
+	/* BIT 0 */
+	bit = ((data>> 0) & 0x01);
+	ktd2692_set_bit(bit);
+
+	 __gpio_set_value(global_ktd2692data->flash_control, 0);
+	ndelay(T_EOD_L*1000); //4us
+
+	/* Data End Condition */
+	__gpio_set_value(global_ktd2692data->flash_control, 1);
+	udelay(T_EOD_H);
+
+	return err;
+}
+
+#if defined(CONFIG_LEDS_SUPPORT_FRONT_FLASH)
+int ktd2692_led_mode_ctrl(int mode)
+{
+	int ret = 0;
+	unsigned long flags = 0;
+	struct pinctrl *pinctrl;
+
+	LED_INFO("KTD2692 - mode = %d\n", mode);
+
+	if(global_ktd2692data == NULL){
+		LED_INFO("KTD2692 global_ktd2692data is not initialized.\n");	
+		return ret;
+	}
+
+	switch(mode) {
+		case 1 : //CAM2_FLASH_MODE_OFF
+			ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
+			if (ret) {
+				LED_ERROR("Failed to requeset ktd2692_led_control\n");
+			} else {
+				LED_INFO("KTD2692-TORCH OFF. : E(%d)\n", mode);
+
+				global_ktd2692data->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;
+				spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
+				ktd2692_write_data(global_ktd2692data->mode_status|
+									KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
+				spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);
+
+				ktd2692_setGpio(0);
+				gpio_free(global_ktd2692data->flash_control);
+				LED_INFO("KTD2692-TORCH OFF. : X(%d)\n", mode);
+			}
+
+			pinctrl = devm_pinctrl_get_select(global_dev, "is");
+			if (IS_ERR(pinctrl))
+				pr_err("%s: flash %s pins are not configured\n", __func__, "is");
+			break;
+		case 2 : //CAM2_FLASH_MODE_SINGLE
+			pinctrl = devm_pinctrl_get_select(global_dev, "host");
+			if (IS_ERR(pinctrl))
+				pr_err("%s: flash %s pins are not configured\n", __func__, "host");
+
+			ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
+			if (ret) {
+				LED_ERROR("Failed to requeset ktd2692_led_control\n");
+			} else {
+				LED_INFO("KTD2692-TORCH ON. : E(%d)\n", mode);
+
+				global_ktd2692data->mode_status = KTD2692_ENABLE_MOVIE_MODE;
+				spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
+				ktd2692_write_data(global_ktd2692data->LVP_Voltage|
+									KTD2692_ADDR_LVP_SETTING);
+				ktd2692_write_data(global_ktd2692data->movie_current_value|
+									KTD2692_ADDR_MOVIE_CURRENT_SETTING);
+				ktd2692_write_data(global_ktd2692data->mode_status|
+									KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
+				spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);
+
+				gpio_free(global_ktd2692data->flash_control);
+				LED_INFO("KTD2692-TORCH ON. : X(%d)\n", mode);
+			}
+			break;
+		default :
+			break;
+	}
+	if (!IS_ERR(pinctrl))
+		devm_pinctrl_put(pinctrl);
+
+	return ret;
+}
+#endif
+
+#ifndef CONFIG_LEDS_SUPPORT_FRONT_FLASH
+ssize_t ktd2692_store(struct device *dev,
+			struct device_attribute *attr, const char *buf,
+			size_t count)
+{
+	int value = 0;
+	int ret = 0;
+	unsigned long flags = 0;
+	struct pinctrl *pinctrl;
+
+	if ((buf == NULL) || kstrtouint(buf, 10, &value)) {
+		return -1;
+	}
+
+	global_ktd2692data->sysfs_input_data = value;
+
+	if (value <= 0) {
+		ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
+		if (ret) {
+			LED_ERROR("Failed to requeset ktd2692_led_control\n");
+		} else {
+			LED_INFO("KTD2692-TORCH OFF. : E(%d)\n", value);
+
+			global_ktd2692data->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;
+			spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
+			ktd2692_write_data(global_ktd2692data->mode_status|
+								KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
+			spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);
+
+			ktd2692_setGpio(0);
+			gpio_free(global_ktd2692data->flash_control);
+			LED_INFO("KTD2692-TORCH OFF. : X(%d)\n", value);
+		}
+
+		pinctrl = devm_pinctrl_get_select(global_dev, "is");
+		if (IS_ERR(pinctrl))
+			pr_err("%s: flash %s pins are not configured\n", __func__, "is");
+
+	} else {
+		pinctrl = devm_pinctrl_get_select(global_dev, "host");
+		if (IS_ERR(pinctrl))
+			pr_err("%s: flash %s pins are not configured\n", __func__, "host");
+
+		ret = gpio_request(global_ktd2692data->flash_control, "ktd2692_led_control");
+		if (ret) {
+			LED_ERROR("Failed to requeset ktd2692_led_control\n");
+		} else {
+			LED_INFO("KTD2692-TORCH ON. : E(%d)\n", value);
+
+			global_ktd2692data->mode_status = KTD2692_ENABLE_MOVIE_MODE;
+			spin_lock_irqsave(&global_ktd2692data->int_lock, flags);
+			ktd2692_write_data(global_ktd2692data->LVP_Voltage|
+								KTD2692_ADDR_LVP_SETTING);
+#if 0	/* use the internel defualt setting */
+			ktd2692_write_data(global_ktd2692data->flash_timeout|
+								KTD2692_ADDR_FLASH_TIMEOUT_SETTING);
+#endif
+			ktd2692_write_data(global_ktd2692data->movie_current_value|
+								KTD2692_ADDR_MOVIE_CURRENT_SETTING);
+			ktd2692_write_data(global_ktd2692data->mode_status|
+								KTD2692_ADDR_MOVIE_FLASHMODE_CONTROL);
+			spin_unlock_irqrestore(&global_ktd2692data->int_lock, flags);
+
+			gpio_free(global_ktd2692data->flash_control);
+			LED_INFO("KTD2692-TORCH ON. : X(%d)\n", value);
+		}
+	}
+
+	if (!IS_ERR(pinctrl))
+		devm_pinctrl_put(pinctrl);
+
+	return count;
+}
+
+ssize_t ktd2692_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", global_ktd2692data->sysfs_input_data);
+}
+
+static DEVICE_ATTR(rear_flash, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH,
+	ktd2692_show, ktd2692_store);
+#endif
+
+static int ktd2692_parse_dt(struct device *dev,
+                                struct ktd2692_platform_data *pdata)
+{
+	struct device_node *dnode = dev->of_node;
+	int ret = 0;
+
+	/* Defulat Value */
+	pdata->LVP_Voltage = KTD2692_DISABLE_LVP;
+	pdata->flash_timeout = KTD2692_TIMER_1049ms;	/* default */
+	pdata->min_current_value = KTD2692_MIN_CURRENT_240mA;
+	pdata->movie_current_value = KTD2692_MOVIE_CURRENT5;
+	pdata->flash_current_value = KTD2692_FLASH_CURRENT16;
+	pdata->mode_status = KTD2692_DISABLES_MOVIE_FLASH_MODE;
+
+	/* get gpio */
+	pdata->flash_control = of_get_named_gpio(dnode, "flash_control", 0);
+	if (!gpio_is_valid(pdata->flash_control)) {
+		dev_err(dev, "failed to get flash_control\n");
+		return -1;
+	}
+
+	return ret;
+}
+
+static int ktd2692_probe(struct platform_device *pdev)
+{
+	struct ktd2692_platform_data *pdata;
+	int ret = 0;
+
+	LED_INFO("KTD2692_LED Probe\n");
+
+	if (pdev->dev.of_node) {
+		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+		if (!pdata) {
+			dev_err(&pdev->dev, "Failed to allocate memory\n");
+			return -ENOMEM;
+		}
+		ret = ktd2692_parse_dt(&pdev->dev, pdata);
+		if (ret < 0) {
+			return -EFAULT;
+		}
+	} else {
+	pdata = pdev->dev.platform_data;
+		if (pdata == NULL) {
+			return -EFAULT;
+		}
+	}
+
+	global_ktd2692data = pdata;
+	global_dev = &pdev->dev;
+
+	LED_INFO("KTD2692_LED Probed\n");
+
+#ifndef CONFIG_LEDS_SUPPORT_FRONT_FLASH
+	ktd2692_dev = device_create(camera_class, NULL, 0, NULL, "flash");
+	if (IS_ERR(ktd2692_dev)) {
+		LED_ERROR("Failed to create device(flash)!\n");
+	}
+
+	if (device_create_file(ktd2692_dev, &dev_attr_rear_flash) < 0) {
+		LED_ERROR("failed to create device file, %s\n",
+				dev_attr_rear_flash.attr.name);
+	}
+#endif
+	spin_lock_init(&pdata->int_lock);
+
+	return 0;
+}
+static int __devexit ktd2692_remove(struct platform_device *pdev)
+{
+#ifndef CONFIG_LEDS_SUPPORT_FRONT_FLASH
+	device_remove_file(ktd2692_dev, &dev_attr_rear_flash);
+	device_destroy(camera_class, 0);
+	class_destroy(camera_class);
+#endif
+
+	return 0;
+}
+
+#ifdef CONFIG_OF
+static struct of_device_id ktd2692_dt_ids[] = {
+	{ .compatible = "ktd2692",},
+	{},
+};
+/*MODULE_DEVICE_TABLE(of, ktd2692_dt_ids);*/
+#endif
+
+static struct platform_driver ktd2692_driver = {
+	.driver = {
+		   .name = ktd2692_NAME,
+		   .owner = THIS_MODULE,
+#ifdef CONFIG_OF
+		   .of_match_table = ktd2692_dt_ids,
+#endif
+		   },
+	.probe = ktd2692_probe,
+	.remove = ktd2692_remove,
+};
+
+static int __init ktd2692_init(void)
+{
+	return platform_driver_register(&ktd2692_driver);
+}
+
+static void __exit ktd2692_exit(void)
+{
+	platform_driver_unregister(&ktd2692_driver);
+}
+
+module_init(ktd2692_init);
+module_exit(ktd2692_exit);
+
+MODULE_AUTHOR("sunggeun yim <sunggeun.yim@samsung.com.com>");
+MODULE_DESCRIPTION("KTD2692 driver");
+MODULE_LICENSE("GPL");
+
+

drivers/leds/leds-lm3530.c

@@ -0,0 +1,503 @@
+/*
+ * Copyright (C) 2011 ST-Ericsson SA.
+ * Copyright (C) 2009 Motorola, Inc.
+ *
+ * License Terms: GNU General Public License v2
+ *
+ * Simple driver for National Semiconductor LM3530 Backlight driver chip
+ *
+ * Author: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
+ * based on leds-lm3530.c by Dan Murphy <D.Murphy@motorola.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/input.h>
+#include <linux/led-lm3530.h>
+#include <linux/types.h>
+#include <linux/regulator/consumer.h>
+#include <linux/module.h>
+
+#define LM3530_LED_DEV "lcd-backlight"
+#define LM3530_NAME "lm3530-led"
+
+#define LM3530_GEN_CONFIG		0x10
+#define LM3530_ALS_CONFIG		0x20
+#define LM3530_BRT_RAMP_RATE		0x30
+#define LM3530_ALS_IMP_SELECT		0x41
+#define LM3530_BRT_CTRL_REG		0xA0
+#define LM3530_ALS_ZB0_REG		0x60
+#define LM3530_ALS_ZB1_REG		0x61
+#define LM3530_ALS_ZB2_REG		0x62
+#define LM3530_ALS_ZB3_REG		0x63
+#define LM3530_ALS_Z0T_REG		0x70
+#define LM3530_ALS_Z1T_REG		0x71
+#define LM3530_ALS_Z2T_REG		0x72
+#define LM3530_ALS_Z3T_REG		0x73
+#define LM3530_ALS_Z4T_REG		0x74
+#define LM3530_REG_MAX			14
+
+/* General Control Register */
+#define LM3530_EN_I2C_SHIFT		(0)
+#define LM3530_RAMP_LAW_SHIFT		(1)
+#define LM3530_MAX_CURR_SHIFT		(2)
+#define LM3530_EN_PWM_SHIFT		(5)
+#define LM3530_PWM_POL_SHIFT		(6)
+#define LM3530_EN_PWM_SIMPLE_SHIFT	(7)
+
+#define LM3530_ENABLE_I2C		(1 << LM3530_EN_I2C_SHIFT)
+#define LM3530_ENABLE_PWM		(1 << LM3530_EN_PWM_SHIFT)
+#define LM3530_POL_LOW			(1 << LM3530_PWM_POL_SHIFT)
+#define LM3530_ENABLE_PWM_SIMPLE	(1 << LM3530_EN_PWM_SIMPLE_SHIFT)
+
+/* ALS Config Register Options */
+#define LM3530_ALS_AVG_TIME_SHIFT	(0)
+#define LM3530_EN_ALS_SHIFT		(3)
+#define LM3530_ALS_SEL_SHIFT		(5)
+
+#define LM3530_ENABLE_ALS		(3 << LM3530_EN_ALS_SHIFT)
+
+/* Brightness Ramp Rate Register */
+#define LM3530_BRT_RAMP_FALL_SHIFT	(0)
+#define LM3530_BRT_RAMP_RISE_SHIFT	(3)
+
+/* ALS Resistor Select */
+#define LM3530_ALS1_IMP_SHIFT		(0)
+#define LM3530_ALS2_IMP_SHIFT		(4)
+
+/* Zone Boundary Register defaults */
+#define LM3530_ALS_ZB_MAX		(4)
+#define LM3530_ALS_WINDOW_mV		(1000)
+#define LM3530_ALS_OFFSET_mV		(4)
+
+/* Zone Target Register defaults */
+#define LM3530_DEF_ZT_0			(0x7F)
+#define LM3530_DEF_ZT_1			(0x66)
+#define LM3530_DEF_ZT_2			(0x4C)
+#define LM3530_DEF_ZT_3			(0x33)
+#define LM3530_DEF_ZT_4			(0x19)
+
+/* 7 bits are used for the brightness : LM3530_BRT_CTRL_REG */
+#define MAX_BRIGHTNESS			(127)
+
+struct lm3530_mode_map {
+	const char *mode;
+	enum lm3530_mode mode_val;
+};
+
+static struct lm3530_mode_map mode_map[] = {
+	{ "man", LM3530_BL_MODE_MANUAL },
+	{ "als", LM3530_BL_MODE_ALS },
+	{ "pwm", LM3530_BL_MODE_PWM },
+};
+
+/**
+ * struct lm3530_data
+ * @led_dev: led class device
+ * @client: i2c client
+ * @pdata: LM3530 platform data
+ * @mode: mode of operation - manual, ALS, PWM
+ * @regulator: regulator
+ * @brighness: previous brightness value
+ * @enable: regulator is enabled
+ */
+struct lm3530_data {
+	struct led_classdev led_dev;
+	struct i2c_client *client;
+	struct lm3530_platform_data *pdata;
+	enum lm3530_mode mode;
+	struct regulator *regulator;
+	enum led_brightness brightness;
+	bool enable;
+};
+
+/*
+ * struct lm3530_als_data
+ * @config  : value of ALS configuration register
+ * @imp_sel : value of ALS resistor select register
+ * @zone    : values of ALS ZB(Zone Boundary) registers
+ */
+struct lm3530_als_data {
+	u8 config;
+	u8 imp_sel;
+	u8 zones[LM3530_ALS_ZB_MAX];
+};
+
+static const u8 lm3530_reg[LM3530_REG_MAX] = {
+	LM3530_GEN_CONFIG,
+	LM3530_ALS_CONFIG,
+	LM3530_BRT_RAMP_RATE,
+	LM3530_ALS_IMP_SELECT,
+	LM3530_BRT_CTRL_REG,
+	LM3530_ALS_ZB0_REG,
+	LM3530_ALS_ZB1_REG,
+	LM3530_ALS_ZB2_REG,
+	LM3530_ALS_ZB3_REG,
+	LM3530_ALS_Z0T_REG,
+	LM3530_ALS_Z1T_REG,
+	LM3530_ALS_Z2T_REG,
+	LM3530_ALS_Z3T_REG,
+	LM3530_ALS_Z4T_REG,
+};
+
+static int lm3530_get_mode_from_str(const char *str)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(mode_map); i++)
+		if (sysfs_streq(str, mode_map[i].mode))
+			return mode_map[i].mode_val;
+
+	return -EINVAL;
+}
+
+static void lm3530_als_configure(struct lm3530_platform_data *pdata,
+				struct lm3530_als_data *als)
+{
+	int i;
+	u32 als_vmin, als_vmax, als_vstep;
+
+	if (pdata->als_vmax == 0) {
+		pdata->als_vmin = 0;
+		pdata->als_vmax = LM3530_ALS_WINDOW_mV;
+	}
+
+	als_vmin = pdata->als_vmin;
+	als_vmax = pdata->als_vmax;
+
+	if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)
+		pdata->als_vmax = als_vmax = als_vmin + LM3530_ALS_WINDOW_mV;
+
+	/* n zone boundary makes n+1 zones */
+	als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1);
+
+	for (i = 0; i < LM3530_ALS_ZB_MAX; i++)
+		als->zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +
+			als_vstep + (i * als_vstep)) * LED_FULL) / 1000;
+
+	als->config =
+		(pdata->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) |
+		(LM3530_ENABLE_ALS) |
+		(pdata->als_input_mode << LM3530_ALS_SEL_SHIFT);
+
+	als->imp_sel =
+		(pdata->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) |
+		(pdata->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);
+}
+
+static int lm3530_led_enable(struct lm3530_data *drvdata)
+{
+	int ret;
+
+	if (drvdata->enable)
+		return 0;
+
+	ret = regulator_enable(drvdata->regulator);
+	if (ret) {
+		dev_err(drvdata->led_dev.dev, "Failed to enable vin:%d\n", ret);
+		return ret;
+	}
+
+	drvdata->enable = true;
+	return 0;
+}
+
+static void lm3530_led_disable(struct lm3530_data *drvdata)
+{
+	int ret;
+
+	if (!drvdata->enable)
+		return;
+
+	ret = regulator_disable(drvdata->regulator);
+	if (ret) {
+		dev_err(drvdata->led_dev.dev, "Failed to disable vin:%d\n",
+			ret);
+		return;
+	}
+
+	drvdata->enable = false;
+}
+
+static int lm3530_init_registers(struct lm3530_data *drvdata)
+{
+	int ret = 0;
+	int i;
+	u8 gen_config;
+	u8 brt_ramp;
+	u8 brightness;
+	u8 reg_val[LM3530_REG_MAX];
+	struct lm3530_platform_data *pdata = drvdata->pdata;
+	struct i2c_client *client = drvdata->client;
+	struct lm3530_pwm_data *pwm = &pdata->pwm_data;
+	struct lm3530_als_data als;
+
+	memset(&als, 0, sizeof(struct lm3530_als_data));
+
+	gen_config = (pdata->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) |
+			((pdata->max_current & 7) << LM3530_MAX_CURR_SHIFT);
+
+	switch (drvdata->mode) {
+	case LM3530_BL_MODE_MANUAL:
+		gen_config |= LM3530_ENABLE_I2C;
+		break;
+	case LM3530_BL_MODE_ALS:
+		gen_config |= LM3530_ENABLE_I2C;
+		lm3530_als_configure(pdata, &als);
+		break;
+	case LM3530_BL_MODE_PWM:
+		gen_config |= LM3530_ENABLE_PWM | LM3530_ENABLE_PWM_SIMPLE |
+			      (pdata->pwm_pol_hi << LM3530_PWM_POL_SHIFT);
+		break;
+	}
+
+	brt_ramp = (pdata->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) |
+			(pdata->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT);
+
+	if (drvdata->brightness)
+		brightness = drvdata->brightness;
+	else
+		brightness = drvdata->brightness = pdata->brt_val;
+
+	if (brightness > drvdata->led_dev.max_brightness)
+		brightness = drvdata->led_dev.max_brightness;
+
+	reg_val[0] = gen_config;	/* LM3530_GEN_CONFIG */
+	reg_val[1] = als.config;	/* LM3530_ALS_CONFIG */
+	reg_val[2] = brt_ramp;		/* LM3530_BRT_RAMP_RATE */
+	reg_val[3] = als.imp_sel;	/* LM3530_ALS_IMP_SELECT */
+	reg_val[4] = brightness;	/* LM3530_BRT_CTRL_REG */
+	reg_val[5] = als.zones[0];	/* LM3530_ALS_ZB0_REG */
+	reg_val[6] = als.zones[1];	/* LM3530_ALS_ZB1_REG */
+	reg_val[7] = als.zones[2];	/* LM3530_ALS_ZB2_REG */
+	reg_val[8] = als.zones[3];	/* LM3530_ALS_ZB3_REG */
+	reg_val[9] = LM3530_DEF_ZT_0;	/* LM3530_ALS_Z0T_REG */
+	reg_val[10] = LM3530_DEF_ZT_1;	/* LM3530_ALS_Z1T_REG */
+	reg_val[11] = LM3530_DEF_ZT_2;	/* LM3530_ALS_Z2T_REG */
+	reg_val[12] = LM3530_DEF_ZT_3;	/* LM3530_ALS_Z3T_REG */
+	reg_val[13] = LM3530_DEF_ZT_4;	/* LM3530_ALS_Z4T_REG */
+
+	ret = lm3530_led_enable(drvdata);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < LM3530_REG_MAX; i++) {
+		/* do not update brightness register when pwm mode */
+		if (lm3530_reg[i] == LM3530_BRT_CTRL_REG &&
+		    drvdata->mode == LM3530_BL_MODE_PWM) {
+			if (pwm->pwm_set_intensity)
+				pwm->pwm_set_intensity(reg_val[i],
+					drvdata->led_dev.max_brightness);
+			continue;
+		}
+
+		ret = i2c_smbus_write_byte_data(client,
+				lm3530_reg[i], reg_val[i]);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static void lm3530_brightness_set(struct led_classdev *led_cdev,
+				     enum led_brightness brt_val)
+{
+	int err;
+	struct lm3530_data *drvdata =
+	    container_of(led_cdev, struct lm3530_data, led_dev);
+	struct lm3530_platform_data *pdata = drvdata->pdata;
+	struct lm3530_pwm_data *pwm = &pdata->pwm_data;
+	u8 max_brightness = led_cdev->max_brightness;
+
+	switch (drvdata->mode) {
+	case LM3530_BL_MODE_MANUAL:
+
+		if (!drvdata->enable) {
+			err = lm3530_init_registers(drvdata);
+			if (err) {
+				dev_err(&drvdata->client->dev,
+					"Register Init failed: %d\n", err);
+				break;
+			}
+		}
+
+		/* set the brightness in brightness control register*/
+		err = i2c_smbus_write_byte_data(drvdata->client,
+				LM3530_BRT_CTRL_REG, brt_val);
+		if (err)
+			dev_err(&drvdata->client->dev,
+				"Unable to set brightness: %d\n", err);
+		else
+			drvdata->brightness = brt_val;
+
+		if (brt_val == 0)
+			lm3530_led_disable(drvdata);
+		break;
+	case LM3530_BL_MODE_ALS:
+		break;
+	case LM3530_BL_MODE_PWM:
+		if (pwm->pwm_set_intensity)
+			pwm->pwm_set_intensity(brt_val, max_brightness);
+		break;
+	default:
+		break;
+	}
+}
+
+static ssize_t lm3530_mode_get(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3530_data *drvdata;
+	int i, len = 0;
+
+	drvdata = container_of(led_cdev, struct lm3530_data, led_dev);
+	for (i = 0; i < ARRAY_SIZE(mode_map); i++)
+		if (drvdata->mode == mode_map[i].mode_val)
+			len += sprintf(buf + len, "[%s] ", mode_map[i].mode);
+		else
+			len += sprintf(buf + len, "%s ", mode_map[i].mode);
+
+	len += sprintf(buf + len, "\n");
+
+	return len;
+}
+
+static ssize_t lm3530_mode_set(struct device *dev, struct device_attribute
+				   *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3530_data *drvdata;
+	struct lm3530_pwm_data *pwm;
+	u8 max_brightness;
+	int mode, err;
+
+	drvdata = container_of(led_cdev, struct lm3530_data, led_dev);
+	pwm = &drvdata->pdata->pwm_data;
+	max_brightness = led_cdev->max_brightness;
+	mode = lm3530_get_mode_from_str(buf);
+	if (mode < 0) {
+		dev_err(dev, "Invalid mode\n");
+		return mode;
+	}
+
+	drvdata->mode = mode;
+
+	/* set pwm to low if unnecessary */
+	if (mode != LM3530_BL_MODE_PWM && pwm->pwm_set_intensity)
+		pwm->pwm_set_intensity(0, max_brightness);
+
+	err = lm3530_init_registers(drvdata);
+	if (err) {
+		dev_err(dev, "Setting %s Mode failed :%d\n", buf, err);
+		return err;
+	}
+
+	return sizeof(drvdata->mode);
+}
+static DEVICE_ATTR(mode, 0644, lm3530_mode_get, lm3530_mode_set);
+
+static struct attribute *lm3530_attrs[] = {
+	&dev_attr_mode.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(lm3530);
+
+static int lm3530_probe(struct i2c_client *client,
+			   const struct i2c_device_id *id)
+{
+	struct lm3530_platform_data *pdata = dev_get_platdata(&client->dev);
+	struct lm3530_data *drvdata;
+	int err = 0;
+
+	if (pdata == NULL) {
+		dev_err(&client->dev, "platform data required\n");
+		return -ENODEV;
+	}
+
+	/* BL mode */
+	if (pdata->mode > LM3530_BL_MODE_PWM) {
+		dev_err(&client->dev, "Illegal Mode request\n");
+		return -EINVAL;
+	}
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "I2C_FUNC_I2C not supported\n");
+		return -EIO;
+	}
+
+	drvdata = devm_kzalloc(&client->dev, sizeof(struct lm3530_data),
+				GFP_KERNEL);
+	if (drvdata == NULL)
+		return -ENOMEM;
+
+	drvdata->mode = pdata->mode;
+	drvdata->client = client;
+	drvdata->pdata = pdata;
+	drvdata->brightness = LED_OFF;
+	drvdata->enable = false;
+	drvdata->led_dev.name = LM3530_LED_DEV;
+	drvdata->led_dev.brightness_set = lm3530_brightness_set;
+	drvdata->led_dev.max_brightness = MAX_BRIGHTNESS;
+	drvdata->led_dev.groups = lm3530_groups;
+
+	i2c_set_clientdata(client, drvdata);
+
+	drvdata->regulator = devm_regulator_get(&client->dev, "vin");
+	if (IS_ERR(drvdata->regulator)) {
+		dev_err(&client->dev, "regulator get failed\n");
+		err = PTR_ERR(drvdata->regulator);
+		drvdata->regulator = NULL;
+		return err;
+	}
+
+	if (drvdata->pdata->brt_val) {
+		err = lm3530_init_registers(drvdata);
+		if (err < 0) {
+			dev_err(&client->dev,
+				"Register Init failed: %d\n", err);
+			return err;
+		}
+	}
+	err = led_classdev_register(&client->dev, &drvdata->led_dev);
+	if (err < 0) {
+		dev_err(&client->dev, "Register led class failed: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int lm3530_remove(struct i2c_client *client)
+{
+	struct lm3530_data *drvdata = i2c_get_clientdata(client);
+
+	lm3530_led_disable(drvdata);
+	led_classdev_unregister(&drvdata->led_dev);
+	return 0;
+}
+
+static const struct i2c_device_id lm3530_id[] = {
+	{LM3530_NAME, 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, lm3530_id);
+
+static struct i2c_driver lm3530_i2c_driver = {
+	.probe = lm3530_probe,
+	.remove = lm3530_remove,
+	.id_table = lm3530_id,
+	.driver = {
+		.name = LM3530_NAME,
+		.owner = THIS_MODULE,
+	},
+};
+
+module_i2c_driver(lm3530_i2c_driver);
+
+MODULE_DESCRIPTION("Back Light driver for LM3530");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>");

drivers/leds/leds-lm3533.c

@@ -0,0 +1,780 @@
+/*
+ * leds-lm3533.c -- LM3533 LED driver
+ *
+ * Copyright (C) 2011-2012 Texas Instruments
+ *
+ * Author: Johan Hovold <jhovold@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under  the terms of the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/leds.h>
+#include <linux/mfd/core.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#include <linux/mfd/lm3533.h>
+
+
+#define LM3533_LVCTRLBANK_MIN		2
+#define LM3533_LVCTRLBANK_MAX		5
+#define LM3533_LVCTRLBANK_COUNT		4
+#define LM3533_RISEFALLTIME_MAX		7
+#define LM3533_ALS_CHANNEL_LV_MIN	1
+#define LM3533_ALS_CHANNEL_LV_MAX	2
+
+#define LM3533_REG_CTRLBANK_BCONF_BASE		0x1b
+#define LM3533_REG_PATTERN_ENABLE		0x28
+#define LM3533_REG_PATTERN_LOW_TIME_BASE	0x71
+#define LM3533_REG_PATTERN_HIGH_TIME_BASE	0x72
+#define LM3533_REG_PATTERN_RISETIME_BASE	0x74
+#define LM3533_REG_PATTERN_FALLTIME_BASE	0x75
+
+#define LM3533_REG_PATTERN_STEP			0x10
+
+#define LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK		0x04
+#define LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK		0x02
+#define LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK	0x01
+
+#define LM3533_LED_FLAG_PATTERN_ENABLE		1
+
+
+struct lm3533_led {
+	struct lm3533 *lm3533;
+	struct lm3533_ctrlbank cb;
+	struct led_classdev cdev;
+	int id;
+
+	struct mutex mutex;
+	unsigned long flags;
+
+	struct work_struct work;
+	u8 new_brightness;
+};
+
+
+static inline struct lm3533_led *to_lm3533_led(struct led_classdev *cdev)
+{
+	return container_of(cdev, struct lm3533_led, cdev);
+}
+
+static inline int lm3533_led_get_ctrlbank_id(struct lm3533_led *led)
+{
+	return led->id + 2;
+}
+
+static inline u8 lm3533_led_get_lv_reg(struct lm3533_led *led, u8 base)
+{
+	return base + led->id;
+}
+
+static inline u8 lm3533_led_get_pattern(struct lm3533_led *led)
+{
+	return led->id;
+}
+
+static inline u8 lm3533_led_get_pattern_reg(struct lm3533_led *led,
+								u8 base)
+{
+	return base + lm3533_led_get_pattern(led) * LM3533_REG_PATTERN_STEP;
+}
+
+static int lm3533_led_pattern_enable(struct lm3533_led *led, int enable)
+{
+	u8 mask;
+	u8 val;
+	int pattern;
+	int state;
+	int ret = 0;
+
+	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, enable);
+
+	mutex_lock(&led->mutex);
+
+	state = test_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
+	if ((enable && state) || (!enable && !state))
+		goto out;
+
+	pattern = lm3533_led_get_pattern(led);
+	mask = 1 << (2 * pattern);
+
+	if (enable)
+		val = mask;
+	else
+		val = 0;
+
+	ret = lm3533_update(led->lm3533, LM3533_REG_PATTERN_ENABLE, val, mask);
+	if (ret) {
+		dev_err(led->cdev.dev, "failed to enable pattern %d (%d)\n",
+							pattern, enable);
+		goto out;
+	}
+
+	__change_bit(LM3533_LED_FLAG_PATTERN_ENABLE, &led->flags);
+out:
+	mutex_unlock(&led->mutex);
+
+	return ret;
+}
+
+static void lm3533_led_work(struct work_struct *work)
+{
+	struct lm3533_led *led = container_of(work, struct lm3533_led, work);
+
+	dev_dbg(led->cdev.dev, "%s - %u\n", __func__, led->new_brightness);
+
+	if (led->new_brightness == 0)
+		lm3533_led_pattern_enable(led, 0);	/* disable blink */
+
+	lm3533_ctrlbank_set_brightness(&led->cb, led->new_brightness);
+}
+
+static void lm3533_led_set(struct led_classdev *cdev,
+						enum led_brightness value)
+{
+	struct lm3533_led *led = to_lm3533_led(cdev);
+
+	dev_dbg(led->cdev.dev, "%s - %d\n", __func__, value);
+
+	led->new_brightness = value;
+	schedule_work(&led->work);
+}
+
+static enum led_brightness lm3533_led_get(struct led_classdev *cdev)
+{
+	struct lm3533_led *led = to_lm3533_led(cdev);
+	u8 val;
+	int ret;
+
+	ret = lm3533_ctrlbank_get_brightness(&led->cb, &val);
+	if (ret)
+		return ret;
+
+	dev_dbg(led->cdev.dev, "%s - %u\n", __func__, val);
+
+	return val;
+}
+
+/* Pattern generator defines (delays in us). */
+#define LM3533_LED_DELAY1_VMIN	0x00
+#define LM3533_LED_DELAY2_VMIN	0x3d
+#define LM3533_LED_DELAY3_VMIN	0x80
+
+#define LM3533_LED_DELAY1_VMAX	(LM3533_LED_DELAY2_VMIN - 1)
+#define LM3533_LED_DELAY2_VMAX	(LM3533_LED_DELAY3_VMIN - 1)
+#define LM3533_LED_DELAY3_VMAX	0xff
+
+#define LM3533_LED_DELAY1_TMIN	16384U
+#define LM3533_LED_DELAY2_TMIN	1130496U
+#define LM3533_LED_DELAY3_TMIN	10305536U
+
+#define LM3533_LED_DELAY1_TMAX	999424U
+#define LM3533_LED_DELAY2_TMAX	9781248U
+#define LM3533_LED_DELAY3_TMAX	76890112U
+
+/* t_step = (t_max - t_min) / (v_max - v_min) */
+#define LM3533_LED_DELAY1_TSTEP	16384
+#define LM3533_LED_DELAY2_TSTEP	131072
+#define LM3533_LED_DELAY3_TSTEP	524288
+
+/* Delay limits for hardware accelerated blinking (in ms). */
+#define LM3533_LED_DELAY_ON_MAX \
+	((LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY2_TSTEP / 2) / 1000)
+#define LM3533_LED_DELAY_OFF_MAX \
+	((LM3533_LED_DELAY3_TMAX + LM3533_LED_DELAY3_TSTEP / 2) / 1000)
+
+/*
+ * Returns linear map of *t from [t_min,t_max] to [v_min,v_max] with a step
+ * size of t_step, where
+ *
+ *	t_step = (t_max - t_min) / (v_max - v_min)
+ *
+ * and updates *t to reflect the mapped value.
+ */
+static u8 time_to_val(unsigned *t, unsigned t_min, unsigned t_step,
+							u8 v_min, u8 v_max)
+{
+	unsigned val;
+
+	val = (*t + t_step / 2 - t_min) / t_step + v_min;
+
+	*t = t_step * (val - v_min) + t_min;
+
+	return (u8)val;
+}
+
+/*
+ * Returns time code corresponding to *delay (in ms) and updates *delay to
+ * reflect actual hardware delay.
+ *
+ * Hardware supports 256 discrete delay times, divided into three groups with
+ * the following ranges and step-sizes:
+ *
+ *	[   16,   999]	[0x00, 0x3e]	step  16 ms
+ *	[ 1130,  9781]	[0x3d, 0x7f]	step 131 ms
+ *	[10306, 76890]	[0x80, 0xff]	step 524 ms
+ *
+ * Note that delay group 3 is only available for delay_off.
+ */
+static u8 lm3533_led_get_hw_delay(unsigned *delay)
+{
+	unsigned t;
+	u8 val;
+
+	t = *delay * 1000;
+
+	if (t >= (LM3533_LED_DELAY2_TMAX + LM3533_LED_DELAY3_TMIN) / 2) {
+		t = clamp(t, LM3533_LED_DELAY3_TMIN, LM3533_LED_DELAY3_TMAX);
+		val = time_to_val(&t,	LM3533_LED_DELAY3_TMIN,
+					LM3533_LED_DELAY3_TSTEP,
+					LM3533_LED_DELAY3_VMIN,
+					LM3533_LED_DELAY3_VMAX);
+	} else if (t >= (LM3533_LED_DELAY1_TMAX + LM3533_LED_DELAY2_TMIN) / 2) {
+		t = clamp(t, LM3533_LED_DELAY2_TMIN, LM3533_LED_DELAY2_TMAX);
+		val = time_to_val(&t,	LM3533_LED_DELAY2_TMIN,
+					LM3533_LED_DELAY2_TSTEP,
+					LM3533_LED_DELAY2_VMIN,
+					LM3533_LED_DELAY2_VMAX);
+	} else {
+		t = clamp(t, LM3533_LED_DELAY1_TMIN, LM3533_LED_DELAY1_TMAX);
+		val = time_to_val(&t,	LM3533_LED_DELAY1_TMIN,
+					LM3533_LED_DELAY1_TSTEP,
+					LM3533_LED_DELAY1_VMIN,
+					LM3533_LED_DELAY1_VMAX);
+	}
+
+	*delay = (t + 500) / 1000;
+
+	return val;
+}
+
+/*
+ * Set delay register base to *delay (in ms) and update *delay to reflect
+ * actual hardware delay used.
+ */
+static u8 lm3533_led_delay_set(struct lm3533_led *led, u8 base,
+							unsigned long *delay)
+{
+	unsigned t;
+	u8 val;
+	u8 reg;
+	int ret;
+
+	t = (unsigned)*delay;
+
+	/* Delay group 3 is only available for low time (delay off). */
+	if (base != LM3533_REG_PATTERN_LOW_TIME_BASE)
+		t = min(t, LM3533_LED_DELAY2_TMAX / 1000);
+
+	val = lm3533_led_get_hw_delay(&t);
+
+	dev_dbg(led->cdev.dev, "%s - %lu: %u (0x%02x)\n", __func__,
+							*delay, t, val);
+	reg = lm3533_led_get_pattern_reg(led, base);
+	ret = lm3533_write(led->lm3533, reg, val);
+	if (ret)
+		dev_err(led->cdev.dev, "failed to set delay (%02x)\n", reg);
+
+	*delay = t;
+
+	return ret;
+}
+
+static int lm3533_led_delay_on_set(struct lm3533_led *led, unsigned long *t)
+{
+	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_HIGH_TIME_BASE, t);
+}
+
+static int lm3533_led_delay_off_set(struct lm3533_led *led, unsigned long *t)
+{
+	return lm3533_led_delay_set(led, LM3533_REG_PATTERN_LOW_TIME_BASE, t);
+}
+
+static int lm3533_led_blink_set(struct led_classdev *cdev,
+				unsigned long *delay_on,
+				unsigned long *delay_off)
+{
+	struct lm3533_led *led = to_lm3533_led(cdev);
+	int ret;
+
+	dev_dbg(led->cdev.dev, "%s - on = %lu, off = %lu\n", __func__,
+							*delay_on, *delay_off);
+
+	if (*delay_on > LM3533_LED_DELAY_ON_MAX ||
+					*delay_off > LM3533_LED_DELAY_OFF_MAX)
+		return -EINVAL;
+
+	if (*delay_on == 0 && *delay_off == 0) {
+		*delay_on = 500;
+		*delay_off = 500;
+	}
+
+	ret = lm3533_led_delay_on_set(led, delay_on);
+	if (ret)
+		return ret;
+
+	ret = lm3533_led_delay_off_set(led, delay_off);
+	if (ret)
+		return ret;
+
+	return lm3533_led_pattern_enable(led, 1);
+}
+
+static ssize_t show_id(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", led->id);
+}
+
+/*
+ * Pattern generator rise/fall times:
+ *
+ *   0 - 2048 us (default)
+ *   1 - 262 ms
+ *   2 - 524 ms
+ *   3 - 1.049 s
+ *   4 - 2.097 s
+ *   5 - 4.194 s
+ *   6 - 8.389 s
+ *   7 - 16.78 s
+ */
+static ssize_t show_risefalltime(struct device *dev,
+					struct device_attribute *attr,
+					char *buf, u8 base)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	ssize_t ret;
+	u8 reg;
+	u8 val;
+
+	reg = lm3533_led_get_pattern_reg(led, base);
+	ret = lm3533_read(led->lm3533, reg, &val);
+	if (ret)
+		return ret;
+
+	return scnprintf(buf, PAGE_SIZE, "%x\n", val);
+}
+
+static ssize_t show_risetime(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	return show_risefalltime(dev, attr, buf,
+					LM3533_REG_PATTERN_RISETIME_BASE);
+}
+
+static ssize_t show_falltime(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	return show_risefalltime(dev, attr, buf,
+					LM3533_REG_PATTERN_FALLTIME_BASE);
+}
+
+static ssize_t store_risefalltime(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len, u8 base)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	u8 val;
+	u8 reg;
+	int ret;
+
+	if (kstrtou8(buf, 0, &val) || val > LM3533_RISEFALLTIME_MAX)
+		return -EINVAL;
+
+	reg = lm3533_led_get_pattern_reg(led, base);
+	ret = lm3533_write(led->lm3533, reg, val);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+static ssize_t store_risetime(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len)
+{
+	return store_risefalltime(dev, attr, buf, len,
+					LM3533_REG_PATTERN_RISETIME_BASE);
+}
+
+static ssize_t store_falltime(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len)
+{
+	return store_risefalltime(dev, attr, buf, len,
+					LM3533_REG_PATTERN_FALLTIME_BASE);
+}
+
+static ssize_t show_als_channel(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	unsigned channel;
+	u8 reg;
+	u8 val;
+	int ret;
+
+	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+	ret = lm3533_read(led->lm3533, reg, &val);
+	if (ret)
+		return ret;
+
+	channel = (val & LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK) + 1;
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n", channel);
+}
+
+static ssize_t store_als_channel(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	unsigned channel;
+	u8 reg;
+	u8 val;
+	u8 mask;
+	int ret;
+
+	if (kstrtouint(buf, 0, &channel))
+		return -EINVAL;
+
+	if (channel < LM3533_ALS_CHANNEL_LV_MIN ||
+					channel > LM3533_ALS_CHANNEL_LV_MAX)
+		return -EINVAL;
+
+	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+	mask = LM3533_REG_CTRLBANK_BCONF_ALS_CHANNEL_MASK;
+	val = channel - 1;
+
+	ret = lm3533_update(led->lm3533, reg, val, mask);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+static ssize_t show_als_en(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	bool enable;
+	u8 reg;
+	u8 val;
+	int ret;
+
+	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+	ret = lm3533_read(led->lm3533, reg, &val);
+	if (ret)
+		return ret;
+
+	enable = val & LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", enable);
+}
+
+static ssize_t store_als_en(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	unsigned enable;
+	u8 reg;
+	u8 mask;
+	u8 val;
+	int ret;
+
+	if (kstrtouint(buf, 0, &enable))
+		return -EINVAL;
+
+	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+	mask = LM3533_REG_CTRLBANK_BCONF_ALS_EN_MASK;
+
+	if (enable)
+		val = mask;
+	else
+		val = 0;
+
+	ret = lm3533_update(led->lm3533, reg, val, mask);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+static ssize_t show_linear(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	u8 reg;
+	u8 val;
+	int linear;
+	int ret;
+
+	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+	ret = lm3533_read(led->lm3533, reg, &val);
+	if (ret)
+		return ret;
+
+	if (val & LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK)
+		linear = 1;
+	else
+		linear = 0;
+
+	return scnprintf(buf, PAGE_SIZE, "%x\n", linear);
+}
+
+static ssize_t store_linear(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	unsigned long linear;
+	u8 reg;
+	u8 mask;
+	u8 val;
+	int ret;
+
+	if (kstrtoul(buf, 0, &linear))
+		return -EINVAL;
+
+	reg = lm3533_led_get_lv_reg(led, LM3533_REG_CTRLBANK_BCONF_BASE);
+	mask = LM3533_REG_CTRLBANK_BCONF_MAPPING_MASK;
+
+	if (linear)
+		val = mask;
+	else
+		val = 0;
+
+	ret = lm3533_update(led->lm3533, reg, val, mask);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+static ssize_t show_pwm(struct device *dev,
+					struct device_attribute *attr,
+					char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	u8 val;
+	int ret;
+
+	ret = lm3533_ctrlbank_get_pwm(&led->cb, &val);
+	if (ret)
+		return ret;
+
+	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
+}
+
+static ssize_t store_pwm(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t len)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	u8 val;
+	int ret;
+
+	if (kstrtou8(buf, 0, &val))
+		return -EINVAL;
+
+	ret = lm3533_ctrlbank_set_pwm(&led->cb, val);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+static LM3533_ATTR_RW(als_channel);
+static LM3533_ATTR_RW(als_en);
+static LM3533_ATTR_RW(falltime);
+static LM3533_ATTR_RO(id);
+static LM3533_ATTR_RW(linear);
+static LM3533_ATTR_RW(pwm);
+static LM3533_ATTR_RW(risetime);
+
+static struct attribute *lm3533_led_attributes[] = {
+	&dev_attr_als_channel.attr,
+	&dev_attr_als_en.attr,
+	&dev_attr_falltime.attr,
+	&dev_attr_id.attr,
+	&dev_attr_linear.attr,
+	&dev_attr_pwm.attr,
+	&dev_attr_risetime.attr,
+	NULL,
+};
+
+static umode_t lm3533_led_attr_is_visible(struct kobject *kobj,
+					     struct attribute *attr, int n)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3533_led *led = to_lm3533_led(led_cdev);
+	umode_t mode = attr->mode;
+
+	if (attr == &dev_attr_als_channel.attr ||
+					attr == &dev_attr_als_en.attr) {
+		if (!led->lm3533->have_als)
+			mode = 0;
+	}
+
+	return mode;
+};
+
+static struct attribute_group lm3533_led_attribute_group = {
+	.is_visible	= lm3533_led_attr_is_visible,
+	.attrs		= lm3533_led_attributes
+};
+
+static const struct attribute_group *lm3533_led_attribute_groups[] = {
+	&lm3533_led_attribute_group,
+	NULL
+};
+
+static int lm3533_led_setup(struct lm3533_led *led,
+					struct lm3533_led_platform_data *pdata)
+{
+	int ret;
+
+	ret = lm3533_ctrlbank_set_max_current(&led->cb, pdata->max_current);
+	if (ret)
+		return ret;
+
+	return lm3533_ctrlbank_set_pwm(&led->cb, pdata->pwm);
+}
+
+static int lm3533_led_probe(struct platform_device *pdev)
+{
+	struct lm3533 *lm3533;
+	struct lm3533_led_platform_data *pdata;
+	struct lm3533_led *led;
+	int ret;
+
+	dev_dbg(&pdev->dev, "%s\n", __func__);
+
+	lm3533 = dev_get_drvdata(pdev->dev.parent);
+	if (!lm3533)
+		return -EINVAL;
+
+	pdata = dev_get_platdata(&pdev->dev);
+	if (!pdata) {
+		dev_err(&pdev->dev, "no platform data\n");
+		return -EINVAL;
+	}
+
+	if (pdev->id < 0 || pdev->id >= LM3533_LVCTRLBANK_COUNT) {
+		dev_err(&pdev->dev, "illegal LED id %d\n", pdev->id);
+		return -EINVAL;
+	}
+
+	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	led->lm3533 = lm3533;
+	led->cdev.name = pdata->name;
+	led->cdev.default_trigger = pdata->default_trigger;
+	led->cdev.brightness_set = lm3533_led_set;
+	led->cdev.brightness_get = lm3533_led_get;
+	led->cdev.blink_set = lm3533_led_blink_set;
+	led->cdev.brightness = LED_OFF;
+	led->cdev.groups = lm3533_led_attribute_groups,
+	led->id = pdev->id;
+
+	mutex_init(&led->mutex);
+	INIT_WORK(&led->work, lm3533_led_work);
+
+	/* The class framework makes a callback to get brightness during
+	 * registration so use parent device (for error reporting) until
+	 * registered.
+	 */
+	led->cb.lm3533 = lm3533;
+	led->cb.id = lm3533_led_get_ctrlbank_id(led);
+	led->cb.dev = lm3533->dev;
+
+	platform_set_drvdata(pdev, led);
+
+	ret = led_classdev_register(pdev->dev.parent, &led->cdev);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register LED %d\n", pdev->id);
+		return ret;
+	}
+
+	led->cb.dev = led->cdev.dev;
+
+	ret = lm3533_led_setup(led, pdata);
+	if (ret)
+		goto err_unregister;
+
+	ret = lm3533_ctrlbank_enable(&led->cb);
+	if (ret)
+		goto err_unregister;
+
+	return 0;
+
+err_unregister:
+	led_classdev_unregister(&led->cdev);
+	flush_work(&led->work);
+
+	return ret;
+}
+
+static int lm3533_led_remove(struct platform_device *pdev)
+{
+	struct lm3533_led *led = platform_get_drvdata(pdev);
+
+	dev_dbg(&pdev->dev, "%s\n", __func__);
+
+	lm3533_ctrlbank_disable(&led->cb);
+	led_classdev_unregister(&led->cdev);
+	flush_work(&led->work);
+
+	return 0;
+}
+
+static void lm3533_led_shutdown(struct platform_device *pdev)
+{
+
+	struct lm3533_led *led = platform_get_drvdata(pdev);
+
+	dev_dbg(&pdev->dev, "%s\n", __func__);
+
+	lm3533_ctrlbank_disable(&led->cb);
+	lm3533_led_set(&led->cdev, LED_OFF);		/* disable blink */
+	flush_work(&led->work);
+}
+
+static struct platform_driver lm3533_led_driver = {
+	.driver = {
+		.name = "lm3533-leds",
+		.owner = THIS_MODULE,
+	},
+	.probe		= lm3533_led_probe,
+	.remove		= lm3533_led_remove,
+	.shutdown	= lm3533_led_shutdown,
+};
+module_platform_driver(lm3533_led_driver);
+
+MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
+MODULE_DESCRIPTION("LM3533 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lm3533-leds");

drivers/leds/leds-lm355x.c

@@ -0,0 +1,571 @@
+/*
+* Simple driver for Texas Instruments LM355x LED Flash driver chip
+* Copyright (C) 2012 Texas Instruments
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*/
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/fs.h>
+#include <linux/regmap.h>
+#include <linux/workqueue.h>
+#include <linux/platform_data/leds-lm355x.h>
+
+enum lm355x_type {
+	CHIP_LM3554 = 0,
+	CHIP_LM3556,
+};
+
+enum lm355x_regs {
+	REG_FLAG = 0,
+	REG_TORCH_CFG,
+	REG_TORCH_CTRL,
+	REG_STROBE_CFG,
+	REG_FLASH_CTRL,
+	REG_INDI_CFG,
+	REG_INDI_CTRL,
+	REG_OPMODE,
+	REG_MAX,
+};
+
+/* operation mode */
+enum lm355x_mode {
+	MODE_SHDN = 0,
+	MODE_INDIC,
+	MODE_TORCH,
+	MODE_FLASH
+};
+
+/* register map info. */
+struct lm355x_reg_data {
+	u8 regno;
+	u8 mask;
+	u8 shift;
+};
+
+struct lm355x_chip_data {
+	struct device *dev;
+	enum lm355x_type type;
+
+	struct led_classdev cdev_flash;
+	struct led_classdev cdev_torch;
+	struct led_classdev cdev_indicator;
+
+	struct work_struct work_flash;
+	struct work_struct work_torch;
+	struct work_struct work_indicator;
+
+	u8 br_flash;
+	u8 br_torch;
+	u8 br_indicator;
+
+	struct lm355x_platform_data *pdata;
+	struct regmap *regmap;
+	struct mutex lock;
+
+	unsigned int last_flag;
+	struct lm355x_reg_data *regs;
+};
+
+/* specific indicator function for lm3556 */
+enum lm3556_indic_pulse_time {
+	PULSE_TIME_0_MS = 0,
+	PULSE_TIME_32_MS,
+	PULSE_TIME_64_MS,
+	PULSE_TIME_92_MS,
+	PULSE_TIME_128_MS,
+	PULSE_TIME_160_MS,
+	PULSE_TIME_196_MS,
+	PULSE_TIME_224_MS,
+	PULSE_TIME_256_MS,
+	PULSE_TIME_288_MS,
+	PULSE_TIME_320_MS,
+	PULSE_TIME_352_MS,
+	PULSE_TIME_384_MS,
+	PULSE_TIME_416_MS,
+	PULSE_TIME_448_MS,
+	PULSE_TIME_480_MS,
+};
+
+enum lm3556_indic_n_blank {
+	INDIC_N_BLANK_0 = 0,
+	INDIC_N_BLANK_1,
+	INDIC_N_BLANK_2,
+	INDIC_N_BLANK_3,
+	INDIC_N_BLANK_4,
+	INDIC_N_BLANK_5,
+	INDIC_N_BLANK_6,
+	INDIC_N_BLANK_7,
+	INDIC_N_BLANK_8,
+	INDIC_N_BLANK_9,
+	INDIC_N_BLANK_10,
+	INDIC_N_BLANK_11,
+	INDIC_N_BLANK_12,
+	INDIC_N_BLANK_13,
+	INDIC_N_BLANK_14,
+	INDIC_N_BLANK_15,
+};
+
+enum lm3556_indic_period {
+	INDIC_PERIOD_0 = 0,
+	INDIC_PERIOD_1,
+	INDIC_PERIOD_2,
+	INDIC_PERIOD_3,
+	INDIC_PERIOD_4,
+	INDIC_PERIOD_5,
+	INDIC_PERIOD_6,
+	INDIC_PERIOD_7,
+};
+
+#define INDIC_PATTERN_SIZE 4
+
+struct indicator {
+	u8 blinking;
+	u8 period_cnt;
+};
+
+/* indicator pattern data only for lm3556 */
+static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
+	[0] = {(INDIC_N_BLANK_1 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_1},
+	[1] = {(INDIC_N_BLANK_15 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_2},
+	[2] = {(INDIC_N_BLANK_10 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_4},
+	[3] = {(INDIC_N_BLANK_5 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_7},
+};
+
+static struct lm355x_reg_data lm3554_regs[REG_MAX] = {
+	[REG_FLAG] = {0xD0, 0xBF, 0},
+	[REG_TORCH_CFG] = {0xE0, 0x80, 7},
+	[REG_TORCH_CTRL] = {0xA0, 0x38, 3},
+	[REG_STROBE_CFG] = {0xE0, 0x04, 2},
+	[REG_FLASH_CTRL] = {0xB0, 0x78, 3},
+	[REG_INDI_CFG] = {0xE0, 0x08, 3},
+	[REG_INDI_CTRL] = {0xA0, 0xC0, 6},
+	[REG_OPMODE] = {0xA0, 0x03, 0},
+};
+
+static struct lm355x_reg_data lm3556_regs[REG_MAX] = {
+	[REG_FLAG] = {0x0B, 0xFF, 0},
+	[REG_TORCH_CFG] = {0x0A, 0x10, 4},
+	[REG_TORCH_CTRL] = {0x09, 0x70, 4},
+	[REG_STROBE_CFG] = {0x0A, 0x20, 5},
+	[REG_FLASH_CTRL] = {0x09, 0x0F, 0},
+	[REG_INDI_CFG] = {0xFF, 0xFF, 0},
+	[REG_INDI_CTRL] = {0x09, 0x70, 4},
+	[REG_OPMODE] = {0x0A, 0x03, 0},
+};
+
+static char lm355x_name[][I2C_NAME_SIZE] = {
+	[CHIP_LM3554] = LM3554_NAME,
+	[CHIP_LM3556] = LM3556_NAME,
+};
+
+/* chip initialize */
+static int lm355x_chip_init(struct lm355x_chip_data *chip)
+{
+	int ret;
+	unsigned int reg_val;
+	struct lm355x_platform_data *pdata = chip->pdata;
+
+	/* input and output pins configuration */
+	switch (chip->type) {
+	case CHIP_LM3554:
+		reg_val = pdata->pin_tx2 | pdata->ntc_pin;
+		ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val);
+		if (ret < 0)
+			goto out;
+		reg_val = pdata->pass_mode;
+		ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val);
+		if (ret < 0)
+			goto out;
+		break;
+
+	case CHIP_LM3556:
+		reg_val = pdata->pin_tx2 | pdata->ntc_pin | pdata->pass_mode;
+		ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val);
+		if (ret < 0)
+			goto out;
+		break;
+	default:
+		return -ENODATA;
+	}
+
+	return ret;
+out:
+	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
+	return ret;
+}
+
+/* chip control */
+static void lm355x_control(struct lm355x_chip_data *chip,
+			   u8 brightness, enum lm355x_mode opmode)
+{
+	int ret;
+	unsigned int reg_val;
+	struct lm355x_platform_data *pdata = chip->pdata;
+	struct lm355x_reg_data *preg = chip->regs;
+
+	ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag);
+	if (ret < 0)
+		goto out;
+	if (chip->last_flag & preg[REG_FLAG].mask)
+		dev_info(chip->dev, "%s Last FLAG is 0x%x\n",
+			 lm355x_name[chip->type],
+			 chip->last_flag & preg[REG_FLAG].mask);
+	/* brightness 0 means shutdown */
+	if (!brightness)
+		opmode = MODE_SHDN;
+
+	switch (opmode) {
+	case MODE_TORCH:
+		ret =
+		    regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno,
+				       preg[REG_TORCH_CTRL].mask,
+				       (brightness - 1)
+				       << preg[REG_TORCH_CTRL].shift);
+		if (ret < 0)
+			goto out;
+
+		if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) {
+			ret =
+			    regmap_update_bits(chip->regmap,
+					       preg[REG_TORCH_CFG].regno,
+					       preg[REG_TORCH_CFG].mask,
+					       0x01 <<
+					       preg[REG_TORCH_CFG].shift);
+			if (ret < 0)
+				goto out;
+			opmode = MODE_SHDN;
+			dev_info(chip->dev,
+				 "torch brt is set - ext. torch pin mode\n");
+		}
+		break;
+
+	case MODE_FLASH:
+
+		ret =
+		    regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno,
+				       preg[REG_FLASH_CTRL].mask,
+				       (brightness - 1)
+				       << preg[REG_FLASH_CTRL].shift);
+		if (ret < 0)
+			goto out;
+
+		if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) {
+			if (chip->type == CHIP_LM3554)
+				reg_val = 0x00;
+			else
+				reg_val = 0x01;
+			ret =
+			    regmap_update_bits(chip->regmap,
+					       preg[REG_STROBE_CFG].regno,
+					       preg[REG_STROBE_CFG].mask,
+					       reg_val <<
+					       preg[REG_STROBE_CFG].shift);
+			if (ret < 0)
+				goto out;
+			opmode = MODE_SHDN;
+			dev_info(chip->dev,
+				 "flash brt is set - ext. strobe pin mode\n");
+		}
+		break;
+
+	case MODE_INDIC:
+		ret =
+		    regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno,
+				       preg[REG_INDI_CTRL].mask,
+				       (brightness - 1)
+				       << preg[REG_INDI_CTRL].shift);
+		if (ret < 0)
+			goto out;
+
+		if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) {
+			ret =
+			    regmap_update_bits(chip->regmap,
+					       preg[REG_INDI_CFG].regno,
+					       preg[REG_INDI_CFG].mask,
+					       0x01 <<
+					       preg[REG_INDI_CFG].shift);
+			if (ret < 0)
+				goto out;
+			opmode = MODE_SHDN;
+		}
+		break;
+	case MODE_SHDN:
+		break;
+	default:
+		return;
+	}
+	/* operation mode control */
+	ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno,
+				 preg[REG_OPMODE].mask,
+				 opmode << preg[REG_OPMODE].shift);
+	if (ret < 0)
+		goto out;
+	return;
+out:
+	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
+	return;
+}
+
+/* torch */
+static void lm355x_deferred_torch_brightness_set(struct work_struct *work)
+{
+	struct lm355x_chip_data *chip =
+	    container_of(work, struct lm355x_chip_data, work_torch);
+
+	mutex_lock(&chip->lock);
+	lm355x_control(chip, chip->br_torch, MODE_TORCH);
+	mutex_unlock(&chip->lock);
+}
+
+static void lm355x_torch_brightness_set(struct led_classdev *cdev,
+					enum led_brightness brightness)
+{
+	struct lm355x_chip_data *chip =
+	    container_of(cdev, struct lm355x_chip_data, cdev_torch);
+
+	chip->br_torch = brightness;
+	schedule_work(&chip->work_torch);
+}
+
+/* flash */
+static void lm355x_deferred_strobe_brightness_set(struct work_struct *work)
+{
+	struct lm355x_chip_data *chip =
+	    container_of(work, struct lm355x_chip_data, work_flash);
+
+	mutex_lock(&chip->lock);
+	lm355x_control(chip, chip->br_flash, MODE_FLASH);
+	mutex_unlock(&chip->lock);
+}
+
+static void lm355x_strobe_brightness_set(struct led_classdev *cdev,
+					 enum led_brightness brightness)
+{
+	struct lm355x_chip_data *chip =
+	    container_of(cdev, struct lm355x_chip_data, cdev_flash);
+
+	chip->br_flash = brightness;
+	schedule_work(&chip->work_flash);
+}
+
+/* indicator */
+static void lm355x_deferred_indicator_brightness_set(struct work_struct *work)
+{
+	struct lm355x_chip_data *chip =
+	    container_of(work, struct lm355x_chip_data, work_indicator);
+
+	mutex_lock(&chip->lock);
+	lm355x_control(chip, chip->br_indicator, MODE_INDIC);
+	mutex_unlock(&chip->lock);
+}
+
+static void lm355x_indicator_brightness_set(struct led_classdev *cdev,
+					    enum led_brightness brightness)
+{
+	struct lm355x_chip_data *chip =
+	    container_of(cdev, struct lm355x_chip_data, cdev_indicator);
+
+	chip->br_indicator = brightness;
+	schedule_work(&chip->work_indicator);
+}
+
+/* indicator pattern only for lm3556*/
+static ssize_t lm3556_indicator_pattern_store(struct device *dev,
+					      struct device_attribute *attr,
+					      const char *buf, size_t size)
+{
+	ssize_t ret;
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm355x_chip_data *chip =
+	    container_of(led_cdev, struct lm355x_chip_data, cdev_indicator);
+	unsigned int state;
+
+	ret = kstrtouint(buf, 10, &state);
+	if (ret)
+		goto out;
+	if (state > INDIC_PATTERN_SIZE - 1)
+		state = INDIC_PATTERN_SIZE - 1;
+
+	ret = regmap_write(chip->regmap, 0x04,
+			   indicator_pattern[state].blinking);
+	if (ret < 0)
+		goto out;
+
+	ret = regmap_write(chip->regmap, 0x05,
+			   indicator_pattern[state].period_cnt);
+	if (ret < 0)
+		goto out;
+
+	return size;
+out:
+	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
+	return ret;
+}
+
+static DEVICE_ATTR(pattern, S_IWUSR, NULL, lm3556_indicator_pattern_store);
+
+static struct attribute *lm355x_indicator_attrs[] = {
+	&dev_attr_pattern.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(lm355x_indicator);
+
+static const struct regmap_config lm355x_regmap = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0xFF,
+};
+
+/* module initialize */
+static int lm355x_probe(struct i2c_client *client,
+				  const struct i2c_device_id *id)
+{
+	struct lm355x_platform_data *pdata = dev_get_platdata(&client->dev);
+	struct lm355x_chip_data *chip;
+
+	int err;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "i2c functionality check fail.\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (pdata == NULL) {
+		dev_err(&client->dev, "needs Platform Data.\n");
+		return -ENODATA;
+	}
+
+	chip = devm_kzalloc(&client->dev,
+			    sizeof(struct lm355x_chip_data), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = &client->dev;
+	chip->type = id->driver_data;
+	switch (id->driver_data) {
+	case CHIP_LM3554:
+		chip->regs = lm3554_regs;
+		break;
+	case CHIP_LM3556:
+		chip->regs = lm3556_regs;
+		break;
+	default:
+		return -ENOSYS;
+	}
+	chip->pdata = pdata;
+
+	chip->regmap = devm_regmap_init_i2c(client, &lm355x_regmap);
+	if (IS_ERR(chip->regmap)) {
+		err = PTR_ERR(chip->regmap);
+		dev_err(&client->dev,
+			"Failed to allocate register map: %d\n", err);
+		return err;
+	}
+
+	mutex_init(&chip->lock);
+	i2c_set_clientdata(client, chip);
+
+	err = lm355x_chip_init(chip);
+	if (err < 0)
+		goto err_out;
+
+	/* flash */
+	INIT_WORK(&chip->work_flash, lm355x_deferred_strobe_brightness_set);
+	chip->cdev_flash.name = "flash";
+	chip->cdev_flash.max_brightness = 16;
+	chip->cdev_flash.brightness_set = lm355x_strobe_brightness_set;
+	chip->cdev_flash.default_trigger = "flash";
+	err = led_classdev_register((struct device *)
+				    &client->dev, &chip->cdev_flash);
+	if (err < 0)
+		goto err_out;
+	/* torch */
+	INIT_WORK(&chip->work_torch, lm355x_deferred_torch_brightness_set);
+	chip->cdev_torch.name = "torch";
+	chip->cdev_torch.max_brightness = 8;
+	chip->cdev_torch.brightness_set = lm355x_torch_brightness_set;
+	chip->cdev_torch.default_trigger = "torch";
+	err = led_classdev_register((struct device *)
+				    &client->dev, &chip->cdev_torch);
+	if (err < 0)
+		goto err_create_torch_file;
+	/* indicator */
+	INIT_WORK(&chip->work_indicator,
+		  lm355x_deferred_indicator_brightness_set);
+	chip->cdev_indicator.name = "indicator";
+	if (id->driver_data == CHIP_LM3554)
+		chip->cdev_indicator.max_brightness = 4;
+	else
+		chip->cdev_indicator.max_brightness = 8;
+	chip->cdev_indicator.brightness_set = lm355x_indicator_brightness_set;
+	/* indicator pattern control only for LM3556 */
+	if (id->driver_data == CHIP_LM3556)
+		chip->cdev_indicator.groups = lm355x_indicator_groups;
+	err = led_classdev_register((struct device *)
+				    &client->dev, &chip->cdev_indicator);
+	if (err < 0)
+		goto err_create_indicator_file;
+
+	dev_info(&client->dev, "%s is initialized\n",
+		 lm355x_name[id->driver_data]);
+	return 0;
+
+err_create_indicator_file:
+	led_classdev_unregister(&chip->cdev_torch);
+err_create_torch_file:
+	led_classdev_unregister(&chip->cdev_flash);
+err_out:
+	return err;
+}
+
+static int lm355x_remove(struct i2c_client *client)
+{
+	struct lm355x_chip_data *chip = i2c_get_clientdata(client);
+	struct lm355x_reg_data *preg = chip->regs;
+
+	regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
+	led_classdev_unregister(&chip->cdev_indicator);
+	flush_work(&chip->work_indicator);
+	led_classdev_unregister(&chip->cdev_torch);
+	flush_work(&chip->work_torch);
+	led_classdev_unregister(&chip->cdev_flash);
+	flush_work(&chip->work_flash);
+	dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);
+
+	return 0;
+}
+
+static const struct i2c_device_id lm355x_id[] = {
+	{LM3554_NAME, CHIP_LM3554},
+	{LM3556_NAME, CHIP_LM3556},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, lm355x_id);
+
+static struct i2c_driver lm355x_i2c_driver = {
+	.driver = {
+		   .name = LM355x_NAME,
+		   .owner = THIS_MODULE,
+		   .pm = NULL,
+		   },
+	.probe = lm355x_probe,
+	.remove = lm355x_remove,
+	.id_table = lm355x_id,
+};
+
+module_i2c_driver(lm355x_i2c_driver);
+
+MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x");
+MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
+MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
+MODULE_LICENSE("GPL v2");

drivers/leds/leds-lm3642.c

@@ -0,0 +1,462 @@
+/*
+* Simple driver for Texas Instruments LM3642 LED Flash driver chip
+* Copyright (C) 2012 Texas Instruments
+*
+* This program is free software; you can redistribute it and/or modify
+* it under the terms of the GNU General Public License version 2 as
+* published by the Free Software Foundation.
+*
+*/
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/fs.h>
+#include <linux/regmap.h>
+#include <linux/workqueue.h>
+#include <linux/platform_data/leds-lm3642.h>
+
+#define	REG_FILT_TIME			(0x0)
+#define	REG_IVFM_MODE			(0x1)
+#define	REG_TORCH_TIME			(0x6)
+#define	REG_FLASH			(0x8)
+#define	REG_I_CTRL			(0x9)
+#define	REG_ENABLE			(0xA)
+#define	REG_FLAG			(0xB)
+#define	REG_MAX				(0xB)
+
+#define	UVLO_EN_SHIFT			(7)
+#define	IVM_D_TH_SHIFT			(2)
+#define	TORCH_RAMP_UP_TIME_SHIFT	(3)
+#define	TORCH_RAMP_DN_TIME_SHIFT	(0)
+#define	INDUCTOR_I_LIMIT_SHIFT		(6)
+#define	FLASH_RAMP_TIME_SHIFT		(3)
+#define	FLASH_TOUT_TIME_SHIFT		(0)
+#define	TORCH_I_SHIFT			(4)
+#define	FLASH_I_SHIFT			(0)
+#define	IVFM_SHIFT			(7)
+#define	TX_PIN_EN_SHIFT			(6)
+#define	STROBE_PIN_EN_SHIFT		(5)
+#define	TORCH_PIN_EN_SHIFT		(4)
+#define	MODE_BITS_SHIFT			(0)
+
+#define	UVLO_EN_MASK			(0x1)
+#define	IVM_D_TH_MASK			(0x7)
+#define	TORCH_RAMP_UP_TIME_MASK		(0x7)
+#define	TORCH_RAMP_DN_TIME_MASK		(0x7)
+#define	INDUCTOR_I_LIMIT_MASK		(0x1)
+#define	FLASH_RAMP_TIME_MASK		(0x7)
+#define	FLASH_TOUT_TIME_MASK		(0x7)
+#define	TORCH_I_MASK			(0x7)
+#define	FLASH_I_MASK			(0xF)
+#define	IVFM_MASK			(0x1)
+#define	TX_PIN_EN_MASK			(0x1)
+#define	STROBE_PIN_EN_MASK		(0x1)
+#define	TORCH_PIN_EN_MASK		(0x1)
+#define	MODE_BITS_MASK			(0x73)
+#define EX_PIN_CONTROL_MASK		(0x71)
+#define EX_PIN_ENABLE_MASK		(0x70)
+
+enum lm3642_mode {
+	MODES_STASNDBY = 0,
+	MODES_INDIC,
+	MODES_TORCH,
+	MODES_FLASH
+};
+
+struct lm3642_chip_data {
+	struct device *dev;
+
+	struct led_classdev cdev_flash;
+	struct led_classdev cdev_torch;
+	struct led_classdev cdev_indicator;
+
+	struct work_struct work_flash;
+	struct work_struct work_torch;
+	struct work_struct work_indicator;
+
+	u8 br_flash;
+	u8 br_torch;
+	u8 br_indicator;
+
+	enum lm3642_torch_pin_enable torch_pin;
+	enum lm3642_strobe_pin_enable strobe_pin;
+	enum lm3642_tx_pin_enable tx_pin;
+
+	struct lm3642_platform_data *pdata;
+	struct regmap *regmap;
+	struct mutex lock;
+
+	unsigned int last_flag;
+};
+
+/* chip initialize */
+static int lm3642_chip_init(struct lm3642_chip_data *chip)
+{
+	int ret;
+	struct lm3642_platform_data *pdata = chip->pdata;
+
+	/* set enable register */
+	ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
+				 pdata->tx_pin);
+	if (ret < 0)
+		dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
+	return ret;
+}
+
+/* chip control */
+static int lm3642_control(struct lm3642_chip_data *chip,
+			  u8 brightness, enum lm3642_mode opmode)
+{
+	int ret;
+
+	ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
+	if (ret < 0) {
+		dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
+		goto out;
+	}
+
+	if (chip->last_flag)
+		dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);
+
+	/* brightness 0 means off-state */
+	if (!brightness)
+		opmode = MODES_STASNDBY;
+
+	switch (opmode) {
+	case MODES_TORCH:
+		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
+					 TORCH_I_MASK << TORCH_I_SHIFT,
+					 (brightness - 1) << TORCH_I_SHIFT);
+
+		if (chip->torch_pin)
+			opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
+		break;
+
+	case MODES_FLASH:
+		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
+					 FLASH_I_MASK << FLASH_I_SHIFT,
+					 (brightness - 1) << FLASH_I_SHIFT);
+
+		if (chip->strobe_pin)
+			opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
+		break;
+
+	case MODES_INDIC:
+		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
+					 TORCH_I_MASK << TORCH_I_SHIFT,
+					 (brightness - 1) << TORCH_I_SHIFT);
+		break;
+
+	case MODES_STASNDBY:
+
+		break;
+
+	default:
+		return ret;
+	}
+	if (ret < 0) {
+		dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
+		goto out;
+	}
+
+	if (chip->tx_pin)
+		opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);
+
+	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
+				 MODE_BITS_MASK << MODE_BITS_SHIFT,
+				 opmode << MODE_BITS_SHIFT);
+out:
+	return ret;
+}
+
+/* torch */
+
+/* torch pin config for lm3642*/
+static ssize_t lm3642_torch_pin_store(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buf, size_t size)
+{
+	ssize_t ret;
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3642_chip_data *chip =
+	    container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
+	unsigned int state;
+
+	ret = kstrtouint(buf, 10, &state);
+	if (ret)
+		goto out_strtoint;
+	if (state != 0)
+		state = 0x01 << TORCH_PIN_EN_SHIFT;
+
+	chip->torch_pin = state;
+	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
+				 TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
+				 state);
+	if (ret < 0)
+		goto out;
+
+	return size;
+out:
+	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
+	return ret;
+out_strtoint:
+	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
+	return ret;
+}
+
+static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);
+
+static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
+{
+	struct lm3642_chip_data *chip =
+	    container_of(work, struct lm3642_chip_data, work_torch);
+
+	mutex_lock(&chip->lock);
+	lm3642_control(chip, chip->br_torch, MODES_TORCH);
+	mutex_unlock(&chip->lock);
+}
+
+static void lm3642_torch_brightness_set(struct led_classdev *cdev,
+					enum led_brightness brightness)
+{
+	struct lm3642_chip_data *chip =
+	    container_of(cdev, struct lm3642_chip_data, cdev_torch);
+
+	chip->br_torch = brightness;
+	schedule_work(&chip->work_torch);
+}
+
+/* flash */
+
+/* strobe pin config for lm3642*/
+static ssize_t lm3642_strobe_pin_store(struct device *dev,
+				       struct device_attribute *attr,
+				       const char *buf, size_t size)
+{
+	ssize_t ret;
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct lm3642_chip_data *chip =
+	    container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
+	unsigned int state;
+
+	ret = kstrtouint(buf, 10, &state);
+	if (ret)
+		goto out_strtoint;
+	if (state != 0)
+		state = 0x01 << STROBE_PIN_EN_SHIFT;
+
+	chip->strobe_pin = state;
+	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
+				 STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
+				 state);
+	if (ret < 0)
+		goto out;
+
+	return size;
+out:
+	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
+	return ret;
+out_strtoint:
+	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
+	return ret;
+}
+
+static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);
+
+static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
+{
+	struct lm3642_chip_data *chip =
+	    container_of(work, struct lm3642_chip_data, work_flash);
+
+	mutex_lock(&chip->lock);
+	lm3642_control(chip, chip->br_flash, MODES_FLASH);
+	mutex_unlock(&chip->lock);
+}
+
+static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
+					 enum led_brightness brightness)
+{
+	struct lm3642_chip_data *chip =
+	    container_of(cdev, struct lm3642_chip_data, cdev_flash);
+
+	chip->br_flash = brightness;
+	schedule_work(&chip->work_flash);
+}
+
+/* indicator */
+static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
+{
+	struct lm3642_chip_data *chip =
+	    container_of(work, struct lm3642_chip_data, work_indicator);
+
+	mutex_lock(&chip->lock);
+	lm3642_control(chip, chip->br_indicator, MODES_INDIC);
+	mutex_unlock(&chip->lock);
+}
+
+static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
+					    enum led_brightness brightness)
+{
+	struct lm3642_chip_data *chip =
+	    container_of(cdev, struct lm3642_chip_data, cdev_indicator);
+
+	chip->br_indicator = brightness;
+	schedule_work(&chip->work_indicator);
+}
+
+static const struct regmap_config lm3642_regmap = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = REG_MAX,
+};
+
+static struct attribute *lm3642_flash_attrs[] = {
+	&dev_attr_strobe_pin.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(lm3642_flash);
+
+static struct attribute *lm3642_torch_attrs[] = {
+	&dev_attr_torch_pin.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(lm3642_torch);
+
+static int lm3642_probe(struct i2c_client *client,
+				  const struct i2c_device_id *id)
+{
+	struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev);
+	struct lm3642_chip_data *chip;
+
+	int err;
+
+	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+		dev_err(&client->dev, "i2c functionality check fail.\n");
+		return -EOPNOTSUPP;
+	}
+
+	if (pdata == NULL) {
+		dev_err(&client->dev, "needs Platform Data.\n");
+		return -ENODATA;
+	}
+
+	chip = devm_kzalloc(&client->dev,
+			    sizeof(struct lm3642_chip_data), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	chip->dev = &client->dev;
+	chip->pdata = pdata;
+
+	chip->tx_pin = pdata->tx_pin;
+	chip->torch_pin = pdata->torch_pin;
+	chip->strobe_pin = pdata->strobe_pin;
+
+	chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
+	if (IS_ERR(chip->regmap)) {
+		err = PTR_ERR(chip->regmap);
+		dev_err(&client->dev, "Failed to allocate register map: %d\n",
+			err);
+		return err;
+	}
+
+	mutex_init(&chip->lock);
+	i2c_set_clientdata(client, chip);
+
+	err = lm3642_chip_init(chip);
+	if (err < 0)
+		goto err_out;
+
+	/* flash */
+	INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
+	chip->cdev_flash.name = "flash";
+	chip->cdev_flash.max_brightness = 16;
+	chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
+	chip->cdev_flash.default_trigger = "flash";
+	chip->cdev_flash.groups = lm3642_flash_groups,
+	err = led_classdev_register((struct device *)
+				    &client->dev, &chip->cdev_flash);
+	if (err < 0) {
+		dev_err(chip->dev, "failed to register flash\n");
+		goto err_out;
+	}
+
+	/* torch */
+	INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
+	chip->cdev_torch.name = "torch";
+	chip->cdev_torch.max_brightness = 8;
+	chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
+	chip->cdev_torch.default_trigger = "torch";
+	chip->cdev_torch.groups = lm3642_torch_groups,
+	err = led_classdev_register((struct device *)
+				    &client->dev, &chip->cdev_torch);
+	if (err < 0) {
+		dev_err(chip->dev, "failed to register torch\n");
+		goto err_create_torch_file;
+	}
+
+	/* indicator */
+	INIT_WORK(&chip->work_indicator,
+		  lm3642_deferred_indicator_brightness_set);
+	chip->cdev_indicator.name = "indicator";
+	chip->cdev_indicator.max_brightness = 8;
+	chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
+	err = led_classdev_register((struct device *)
+				    &client->dev, &chip->cdev_indicator);
+	if (err < 0) {
+		dev_err(chip->dev, "failed to register indicator\n");
+		goto err_create_indicator_file;
+	}
+
+	dev_info(&client->dev, "LM3642 is initialized\n");
+	return 0;
+
+err_create_indicator_file:
+	led_classdev_unregister(&chip->cdev_torch);
+err_create_torch_file:
+	led_classdev_unregister(&chip->cdev_flash);
+err_out:
+	return err;
+}
+
+static int lm3642_remove(struct i2c_client *client)
+{
+	struct lm3642_chip_data *chip = i2c_get_clientdata(client);
+
+	led_classdev_unregister(&chip->cdev_indicator);
+	flush_work(&chip->work_indicator);
+	led_classdev_unregister(&chip->cdev_torch);
+	flush_work(&chip->work_torch);
+	led_classdev_unregister(&chip->cdev_flash);
+	flush_work(&chip->work_flash);
+	regmap_write(chip->regmap, REG_ENABLE, 0);
+	return 0;
+}
+
+static const struct i2c_device_id lm3642_id[] = {
+	{LM3642_NAME, 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, lm3642_id);
+
+static struct i2c_driver lm3642_i2c_driver = {
+	.driver = {
+		   .name = LM3642_NAME,
+		   .owner = THIS_MODULE,
+		   .pm = NULL,
+		   },
+	.probe = lm3642_probe,
+	.remove = lm3642_remove,
+	.id_table = lm3642_id,
+};
+
+module_i2c_driver(lm3642_i2c_driver);
+
+MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
+MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
+MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
+MODULE_LICENSE("GPL v2");

drivers/leds/leds-locomo.c

@@ -0,0 +1,97 @@
+/*
+ * linux/drivers/leds/leds-locomo.c
+ *
+ * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/leds.h>
+
+#include <mach/hardware.h>
+#include <asm/hardware/locomo.h>
+
+static void locomoled_brightness_set(struct led_classdev *led_cdev,
+				enum led_brightness value, int offset)
+{
+	struct locomo_dev *locomo_dev = LOCOMO_DEV(led_cdev->dev->parent);
+	unsigned long flags;
+
+	local_irq_save(flags);
+	if (value)
+		locomo_writel(LOCOMO_LPT_TOFH, locomo_dev->mapbase + offset);
+	else
+		locomo_writel(LOCOMO_LPT_TOFL, locomo_dev->mapbase + offset);
+	local_irq_restore(flags);
+}
+
+static void locomoled_brightness_set0(struct led_classdev *led_cdev,
+				enum led_brightness value)
+{
+	locomoled_brightness_set(led_cdev, value, LOCOMO_LPT0);
+}
+
+static void locomoled_brightness_set1(struct led_classdev *led_cdev,
+				enum led_brightness value)
+{
+	locomoled_brightness_set(led_cdev, value, LOCOMO_LPT1);
+}
+
+static struct led_classdev locomo_led0 = {
+	.name			= "locomo:amber:charge",
+	.default_trigger	= "main-battery-charging",
+	.brightness_set		= locomoled_brightness_set0,
+};
+
+static struct led_classdev locomo_led1 = {
+	.name			= "locomo:green:mail",
+	.default_trigger	= "nand-disk",
+	.brightness_set		= locomoled_brightness_set1,
+};
+
+static int locomoled_probe(struct locomo_dev *ldev)
+{
+	int ret;
+
+	ret = led_classdev_register(&ldev->dev, &locomo_led0);
+	if (ret < 0)
+		return ret;
+
+	ret = led_classdev_register(&ldev->dev, &locomo_led1);
+	if (ret < 0)
+		led_classdev_unregister(&locomo_led0);
+
+	return ret;
+}
+
+static int locomoled_remove(struct locomo_dev *dev)
+{
+	led_classdev_unregister(&locomo_led0);
+	led_classdev_unregister(&locomo_led1);
+	return 0;
+}
+
+static struct locomo_driver locomoled_driver = {
+	.drv = {
+		.name = "locomoled"
+	},
+	.devid	= LOCOMO_DEVID_LED,
+	.probe	= locomoled_probe,
+	.remove	= locomoled_remove,
+};
+
+static int __init locomoled_init(void)
+{
+	return locomo_driver_register(&locomoled_driver);
+}
+module_init(locomoled_init);
+
+MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
+MODULE_DESCRIPTION("Locomo LED driver");
+MODULE_LICENSE("GPL");

drivers/leds/leds-lp3944.c

@@ -0,0 +1,459 @@
+/*
+ * leds-lp3944.c - driver for National Semiconductor LP3944 Funlight Chip
+ *
+ * Copyright (C) 2009 Antonio Ospite <ospite@studenti.unina.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+/*
+ * I2C driver for National Semiconductor LP3944 Funlight Chip
+ * http://www.national.com/pf/LP/LP3944.html
+ *
+ * This helper chip can drive up to 8 leds, with two programmable DIM modes;
+ * it could even be used as a gpio expander but this driver assumes it is used
+ * as a led controller.
+ *
+ * The DIM modes are used to set _blink_ patterns for leds, the pattern is
+ * specified supplying two parameters:
+ *   - period: from 0s to 1.6s
+ *   - duty cycle: percentage of the period the led is on, from 0 to 100
+ *
+ * LP3944 can be found on Motorola A910 smartphone, where it drives the rgb
+ * leds, the camera flash light and the displays backlights.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+#include <linux/leds-lp3944.h>
+
+/* Read Only Registers */
+#define LP3944_REG_INPUT1     0x00 /* LEDs 0-7 InputRegister (Read Only) */
+#define LP3944_REG_REGISTER1  0x01 /* None (Read Only) */
+
+#define LP3944_REG_PSC0       0x02 /* Frequency Prescaler 0 (R/W) */
+#define LP3944_REG_PWM0       0x03 /* PWM Register 0 (R/W) */
+#define LP3944_REG_PSC1       0x04 /* Frequency Prescaler 1 (R/W) */
+#define LP3944_REG_PWM1       0x05 /* PWM Register 1 (R/W) */
+#define LP3944_REG_LS0        0x06 /* LEDs 0-3 Selector (R/W) */
+#define LP3944_REG_LS1        0x07 /* LEDs 4-7 Selector (R/W) */
+
+/* These registers are not used to control leds in LP3944, they can store
+ * arbitrary values which the chip will ignore.
+ */
+#define LP3944_REG_REGISTER8  0x08
+#define LP3944_REG_REGISTER9  0x09
+
+#define LP3944_DIM0 0
+#define LP3944_DIM1 1
+
+/* period in ms */
+#define LP3944_PERIOD_MIN 0
+#define LP3944_PERIOD_MAX 1600
+
+/* duty cycle is a percentage */
+#define LP3944_DUTY_CYCLE_MIN 0
+#define LP3944_DUTY_CYCLE_MAX 100
+
+#define ldev_to_led(c)       container_of(c, struct lp3944_led_data, ldev)
+
+/* Saved data */
+struct lp3944_led_data {
+	u8 id;
+	enum lp3944_type type;
+	enum lp3944_status status;
+	struct led_classdev ldev;
+	struct i2c_client *client;
+	struct work_struct work;
+};
+
+struct lp3944_data {
+	struct mutex lock;
+	struct i2c_client *client;
+	struct lp3944_led_data leds[LP3944_LEDS_MAX];
+};
+
+static int lp3944_reg_read(struct i2c_client *client, u8 reg, u8 *value)
+{
+	int tmp;
+
+	tmp = i2c_smbus_read_byte_data(client, reg);
+	if (tmp < 0)
+		return tmp;
+
+	*value = tmp;
+
+	return 0;
+}
+
+static int lp3944_reg_write(struct i2c_client *client, u8 reg, u8 value)
+{
+	return i2c_smbus_write_byte_data(client, reg, value);
+}
+
+/**
+ * Set the period for DIM status
+ *
+ * @client: the i2c client
+ * @dim: either LP3944_DIM0 or LP3944_DIM1
+ * @period: period of a blink, that is a on/off cycle, expressed in ms.
+ */
+static int lp3944_dim_set_period(struct i2c_client *client, u8 dim, u16 period)
+{
+	u8 psc_reg;
+	u8 psc_value;
+	int err;
+
+	if (dim == LP3944_DIM0)
+		psc_reg = LP3944_REG_PSC0;
+	else if (dim == LP3944_DIM1)
+		psc_reg = LP3944_REG_PSC1;
+	else
+		return -EINVAL;
+
+	/* Convert period to Prescaler value */
+	if (period > LP3944_PERIOD_MAX)
+		return -EINVAL;
+
+	psc_value = (period * 255) / LP3944_PERIOD_MAX;
+
+	err = lp3944_reg_write(client, psc_reg, psc_value);
+
+	return err;
+}
+
+/**
+ * Set the duty cycle for DIM status
+ *
+ * @client: the i2c client
+ * @dim: either LP3944_DIM0 or LP3944_DIM1
+ * @duty_cycle: percentage of a period during which a led is ON
+ */
+static int lp3944_dim_set_dutycycle(struct i2c_client *client, u8 dim,
+				    u8 duty_cycle)
+{
+	u8 pwm_reg;
+	u8 pwm_value;
+	int err;
+
+	if (dim == LP3944_DIM0)
+		pwm_reg = LP3944_REG_PWM0;
+	else if (dim == LP3944_DIM1)
+		pwm_reg = LP3944_REG_PWM1;
+	else
+		return -EINVAL;
+
+	/* Convert duty cycle to PWM value */
+	if (duty_cycle > LP3944_DUTY_CYCLE_MAX)
+		return -EINVAL;
+
+	pwm_value = (duty_cycle * 255) / LP3944_DUTY_CYCLE_MAX;
+
+	err = lp3944_reg_write(client, pwm_reg, pwm_value);
+
+	return err;
+}
+
+/**
+ * Set the led status
+ *
+ * @led: a lp3944_led_data structure
+ * @status: one of LP3944_LED_STATUS_OFF
+ *                 LP3944_LED_STATUS_ON
+ *                 LP3944_LED_STATUS_DIM0
+ *                 LP3944_LED_STATUS_DIM1
+ */
+static int lp3944_led_set(struct lp3944_led_data *led, u8 status)
+{
+	struct lp3944_data *data = i2c_get_clientdata(led->client);
+	u8 id = led->id;
+	u8 reg;
+	u8 val = 0;
+	int err;
+
+	dev_dbg(&led->client->dev, "%s: %s, status before normalization:%d\n",
+		__func__, led->ldev.name, status);
+
+	switch (id) {
+	case LP3944_LED0:
+	case LP3944_LED1:
+	case LP3944_LED2:
+	case LP3944_LED3:
+		reg = LP3944_REG_LS0;
+		break;
+	case LP3944_LED4:
+	case LP3944_LED5:
+	case LP3944_LED6:
+	case LP3944_LED7:
+		id -= LP3944_LED4;
+		reg = LP3944_REG_LS1;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (status > LP3944_LED_STATUS_DIM1)
+		return -EINVAL;
+
+	/* invert only 0 and 1, leave unchanged the other values,
+	 * remember we are abusing status to set blink patterns
+	 */
+	if (led->type == LP3944_LED_TYPE_LED_INVERTED && status < 2)
+		status = 1 - status;
+
+	mutex_lock(&data->lock);
+	lp3944_reg_read(led->client, reg, &val);
+
+	val &= ~(LP3944_LED_STATUS_MASK << (id << 1));
+	val |= (status << (id << 1));
+
+	dev_dbg(&led->client->dev, "%s: %s, reg:%d id:%d status:%d val:%#x\n",
+		__func__, led->ldev.name, reg, id, status, val);
+
+	/* set led status */
+	err = lp3944_reg_write(led->client, reg, val);
+	mutex_unlock(&data->lock);
+
+	return err;
+}
+
+static int lp3944_led_set_blink(struct led_classdev *led_cdev,
+				unsigned long *delay_on,
+				unsigned long *delay_off)
+{
+	struct lp3944_led_data *led = ldev_to_led(led_cdev);
+	u16 period;
+	u8 duty_cycle;
+	int err;
+
+	/* units are in ms */
+	if (*delay_on + *delay_off > LP3944_PERIOD_MAX)
+		return -EINVAL;
+
+	if (*delay_on == 0 && *delay_off == 0) {
+		/* Special case: the leds subsystem requires a default user
+		 * friendly blink pattern for the LED.  Let's blink the led
+		 * slowly (1Hz).
+		 */
+		*delay_on = 500;
+		*delay_off = 500;
+	}
+
+	period = (*delay_on) + (*delay_off);
+
+	/* duty_cycle is the percentage of period during which the led is ON */
+	duty_cycle = 100 * (*delay_on) / period;
+
+	/* invert duty cycle for inverted leds, this has the same effect of
+	 * swapping delay_on and delay_off
+	 */
+	if (led->type == LP3944_LED_TYPE_LED_INVERTED)
+		duty_cycle = 100 - duty_cycle;
+
+	/* NOTE: using always the first DIM mode, this means that all leds
+	 * will have the same blinking pattern.
+	 *
+	 * We could find a way later to have two leds blinking in hardware
+	 * with different patterns at the same time, falling back to software
+	 * control for the other ones.
+	 */
+	err = lp3944_dim_set_period(led->client, LP3944_DIM0, period);
+	if (err)
+		return err;
+
+	err = lp3944_dim_set_dutycycle(led->client, LP3944_DIM0, duty_cycle);
+	if (err)
+		return err;
+
+	dev_dbg(&led->client->dev, "%s: OK hardware accelerated blink!\n",
+		__func__);
+
+	led->status = LP3944_LED_STATUS_DIM0;
+	schedule_work(&led->work);
+
+	return 0;
+}
+
+static void lp3944_led_set_brightness(struct led_classdev *led_cdev,
+				      enum led_brightness brightness)
+{
+	struct lp3944_led_data *led = ldev_to_led(led_cdev);
+
+	dev_dbg(&led->client->dev, "%s: %s, %d\n",
+		__func__, led_cdev->name, brightness);
+
+	led->status = !!brightness;
+	schedule_work(&led->work);
+}
+
+static void lp3944_led_work(struct work_struct *work)
+{
+	struct lp3944_led_data *led;
+
+	led = container_of(work, struct lp3944_led_data, work);
+	lp3944_led_set(led, led->status);
+}
+
+static int lp3944_configure(struct i2c_client *client,
+			    struct lp3944_data *data,
+			    struct lp3944_platform_data *pdata)
+{
+	int i, err = 0;
+
+	for (i = 0; i < pdata->leds_size; i++) {
+		struct lp3944_led *pled = &pdata->leds[i];
+		struct lp3944_led_data *led = &data->leds[i];
+		led->client = client;
+		led->id = i;
+
+		switch (pled->type) {
+
+		case LP3944_LED_TYPE_LED:
+		case LP3944_LED_TYPE_LED_INVERTED:
+			led->type = pled->type;
+			led->status = pled->status;
+			led->ldev.name = pled->name;
+			led->ldev.max_brightness = 1;
+			led->ldev.brightness_set = lp3944_led_set_brightness;
+			led->ldev.blink_set = lp3944_led_set_blink;
+			led->ldev.flags = LED_CORE_SUSPENDRESUME;
+
+			INIT_WORK(&led->work, lp3944_led_work);
+			err = led_classdev_register(&client->dev, &led->ldev);
+			if (err < 0) {
+				dev_err(&client->dev,
+					"couldn't register LED %s\n",
+					led->ldev.name);
+				goto exit;
+			}
+
+			/* to expose the default value to userspace */
+			led->ldev.brightness =
+					(enum led_brightness) led->status;
+
+			/* Set the default led status */
+			err = lp3944_led_set(led, led->status);
+			if (err < 0) {
+				dev_err(&client->dev,
+					"%s couldn't set STATUS %d\n",
+					led->ldev.name, led->status);
+				goto exit;
+			}
+			break;
+
+		case LP3944_LED_TYPE_NONE:
+		default:
+			break;
+
+		}
+	}
+	return 0;
+
+exit:
+	if (i > 0)
+		for (i = i - 1; i >= 0; i--)
+			switch (pdata->leds[i].type) {
+
+			case LP3944_LED_TYPE_LED:
+			case LP3944_LED_TYPE_LED_INVERTED:
+				led_classdev_unregister(&data->leds[i].ldev);
+				cancel_work_sync(&data->leds[i].work);
+				break;
+
+			case LP3944_LED_TYPE_NONE:
+			default:
+				break;
+			}
+
+	return err;
+}
+
+static int lp3944_probe(struct i2c_client *client,
+				  const struct i2c_device_id *id)
+{
+	struct lp3944_platform_data *lp3944_pdata =
+			dev_get_platdata(&client->dev);
+	struct lp3944_data *data;
+	int err;
+
+	if (lp3944_pdata == NULL) {
+		dev_err(&client->dev, "no platform data\n");
+		return -EINVAL;
+	}
+
+	/* Let's see whether this adapter can support what we need. */
+	if (!i2c_check_functionality(client->adapter,
+				I2C_FUNC_SMBUS_BYTE_DATA)) {
+		dev_err(&client->dev, "insufficient functionality!\n");
+		return -ENODEV;
+	}
+
+	data = devm_kzalloc(&client->dev, sizeof(struct lp3944_data),
+			GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->client = client;
+	i2c_set_clientdata(client, data);
+
+	mutex_init(&data->lock);
+
+	err = lp3944_configure(client, data, lp3944_pdata);
+	if (err < 0)
+		return err;
+
+	dev_info(&client->dev, "lp3944 enabled\n");
+	return 0;
+}
+
+static int lp3944_remove(struct i2c_client *client)
+{
+	struct lp3944_platform_data *pdata = dev_get_platdata(&client->dev);
+	struct lp3944_data *data = i2c_get_clientdata(client);
+	int i;
+
+	for (i = 0; i < pdata->leds_size; i++)
+		switch (data->leds[i].type) {
+		case LP3944_LED_TYPE_LED:
+		case LP3944_LED_TYPE_LED_INVERTED:
+			led_classdev_unregister(&data->leds[i].ldev);
+			cancel_work_sync(&data->leds[i].work);
+			break;
+
+		case LP3944_LED_TYPE_NONE:
+		default:
+			break;
+		}
+
+	return 0;
+}
+
+/* lp3944 i2c driver struct */
+static const struct i2c_device_id lp3944_id[] = {
+	{"lp3944", 0},
+	{}
+};
+
+MODULE_DEVICE_TABLE(i2c, lp3944_id);
+
+static struct i2c_driver lp3944_driver = {
+	.driver   = {
+		   .name = "lp3944",
+	},
+	.probe    = lp3944_probe,
+	.remove   = lp3944_remove,
+	.id_table = lp3944_id,
+};
+
+module_i2c_driver(lp3944_driver);
+
+MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
+MODULE_DESCRIPTION("LP3944 Fun Light Chip");
+MODULE_LICENSE("GPL");

drivers/leds/leds-lp5521.c

@@ -0,0 +1,617 @@
+/*
+ * LP5521 LED chip driver.
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ * Copyright (C) 2012 Texas Instruments
+ *
+ * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
+ *          Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_data/leds-lp55xx.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+
+#include "leds-lp55xx-common.h"
+
+#define LP5521_PROGRAM_LENGTH		32
+#define LP5521_MAX_LEDS			3
+#define LP5521_CMD_DIRECT		0x3F
+
+/* Registers */
+#define LP5521_REG_ENABLE		0x00
+#define LP5521_REG_OP_MODE		0x01
+#define LP5521_REG_R_PWM		0x02
+#define LP5521_REG_G_PWM		0x03
+#define LP5521_REG_B_PWM		0x04
+#define LP5521_REG_R_CURRENT		0x05
+#define LP5521_REG_G_CURRENT		0x06
+#define LP5521_REG_B_CURRENT		0x07
+#define LP5521_REG_CONFIG		0x08
+#define LP5521_REG_STATUS		0x0C
+#define LP5521_REG_RESET		0x0D
+#define LP5521_REG_R_PROG_MEM		0x10
+#define LP5521_REG_G_PROG_MEM		0x30
+#define LP5521_REG_B_PROG_MEM		0x50
+
+/* Base register to set LED current */
+#define LP5521_REG_LED_CURRENT_BASE	LP5521_REG_R_CURRENT
+/* Base register to set the brightness */
+#define LP5521_REG_LED_PWM_BASE		LP5521_REG_R_PWM
+
+/* Bits in ENABLE register */
+#define LP5521_MASTER_ENABLE		0x40	/* Chip master enable */
+#define LP5521_LOGARITHMIC_PWM		0x80	/* Logarithmic PWM adjustment */
+#define LP5521_EXEC_RUN			0x2A
+#define LP5521_ENABLE_DEFAULT	\
+	(LP5521_MASTER_ENABLE | LP5521_LOGARITHMIC_PWM)
+#define LP5521_ENABLE_RUN_PROGRAM	\
+	(LP5521_ENABLE_DEFAULT | LP5521_EXEC_RUN)
+
+/* CONFIG register */
+#define LP5521_PWM_HF			0x40	/* PWM: 0 = 256Hz, 1 = 558Hz */
+#define LP5521_PWRSAVE_EN		0x20	/* 1 = Power save mode */
+#define LP5521_CP_MODE_OFF		0	/* Charge pump (CP) off */
+#define LP5521_CP_MODE_BYPASS		8	/* CP forced to bypass mode */
+#define LP5521_CP_MODE_1X5		0x10	/* CP forced to 1.5x mode */
+#define LP5521_CP_MODE_AUTO		0x18	/* Automatic mode selection */
+#define LP5521_R_TO_BATT		0x04	/* R out: 0 = CP, 1 = Vbat */
+#define LP5521_CLK_INT			0x01	/* Internal clock */
+#define LP5521_DEFAULT_CFG		\
+	(LP5521_PWM_HF | LP5521_PWRSAVE_EN | LP5521_CP_MODE_AUTO)
+
+/* Status */
+#define LP5521_EXT_CLK_USED		0x08
+
+/* default R channel current register value */
+#define LP5521_REG_R_CURR_DEFAULT	0xAF
+
+/* Reset register value */
+#define LP5521_RESET			0xFF
+
+/* Program Memory Operations */
+#define LP5521_MODE_R_M			0x30	/* Operation Mode Register */
+#define LP5521_MODE_G_M			0x0C
+#define LP5521_MODE_B_M			0x03
+#define LP5521_LOAD_R			0x10
+#define LP5521_LOAD_G			0x04
+#define LP5521_LOAD_B			0x01
+
+#define LP5521_R_IS_LOADING(mode)	\
+	((mode & LP5521_MODE_R_M) == LP5521_LOAD_R)
+#define LP5521_G_IS_LOADING(mode)	\
+	((mode & LP5521_MODE_G_M) == LP5521_LOAD_G)
+#define LP5521_B_IS_LOADING(mode)	\
+	((mode & LP5521_MODE_B_M) == LP5521_LOAD_B)
+
+#define LP5521_EXEC_R_M			0x30	/* Enable Register */
+#define LP5521_EXEC_G_M			0x0C
+#define LP5521_EXEC_B_M			0x03
+#define LP5521_EXEC_M			0x3F
+#define LP5521_RUN_R			0x20
+#define LP5521_RUN_G			0x08
+#define LP5521_RUN_B			0x02
+
+static inline void lp5521_wait_opmode_done(void)
+{
+	/* operation mode change needs to be longer than 153 us */
+	usleep_range(200, 300);
+}
+
+static inline void lp5521_wait_enable_done(void)
+{
+	/* it takes more 488 us to update ENABLE register */
+	usleep_range(500, 600);
+}
+
+static void lp5521_set_led_current(struct lp55xx_led *led, u8 led_current)
+{
+	led->led_current = led_current;
+	lp55xx_write(led->chip, LP5521_REG_LED_CURRENT_BASE + led->chan_nr,
+		led_current);
+}
+
+static void lp5521_load_engine(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 mask[] = {
+		[LP55XX_ENGINE_1] = LP5521_MODE_R_M,
+		[LP55XX_ENGINE_2] = LP5521_MODE_G_M,
+		[LP55XX_ENGINE_3] = LP5521_MODE_B_M,
+	};
+
+	u8 val[] = {
+		[LP55XX_ENGINE_1] = LP5521_LOAD_R,
+		[LP55XX_ENGINE_2] = LP5521_LOAD_G,
+		[LP55XX_ENGINE_3] = LP5521_LOAD_B,
+	};
+
+	lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], val[idx]);
+
+	lp5521_wait_opmode_done();
+}
+
+static void lp5521_stop_all_engines(struct lp55xx_chip *chip)
+{
+	lp55xx_write(chip, LP5521_REG_OP_MODE, 0);
+	lp5521_wait_opmode_done();
+}
+
+static void lp5521_stop_engine(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 mask[] = {
+		[LP55XX_ENGINE_1] = LP5521_MODE_R_M,
+		[LP55XX_ENGINE_2] = LP5521_MODE_G_M,
+		[LP55XX_ENGINE_3] = LP5521_MODE_B_M,
+	};
+
+	lp55xx_update_bits(chip, LP5521_REG_OP_MODE, mask[idx], 0);
+
+	lp5521_wait_opmode_done();
+}
+
+static void lp5521_run_engine(struct lp55xx_chip *chip, bool start)
+{
+	int ret;
+	u8 mode;
+	u8 exec;
+
+	/* stop engine */
+	if (!start) {
+		lp5521_stop_engine(chip);
+		lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
+		lp5521_wait_opmode_done();
+		return;
+	}
+
+	/*
+	 * To run the engine,
+	 * operation mode and enable register should updated at the same time
+	 */
+
+	ret = lp55xx_read(chip, LP5521_REG_OP_MODE, &mode);
+	if (ret)
+		return;
+
+	ret = lp55xx_read(chip, LP5521_REG_ENABLE, &exec);
+	if (ret)
+		return;
+
+	/* change operation mode to RUN only when each engine is loading */
+	if (LP5521_R_IS_LOADING(mode)) {
+		mode = (mode & ~LP5521_MODE_R_M) | LP5521_RUN_R;
+		exec = (exec & ~LP5521_EXEC_R_M) | LP5521_RUN_R;
+	}
+
+	if (LP5521_G_IS_LOADING(mode)) {
+		mode = (mode & ~LP5521_MODE_G_M) | LP5521_RUN_G;
+		exec = (exec & ~LP5521_EXEC_G_M) | LP5521_RUN_G;
+	}
+
+	if (LP5521_B_IS_LOADING(mode)) {
+		mode = (mode & ~LP5521_MODE_B_M) | LP5521_RUN_B;
+		exec = (exec & ~LP5521_EXEC_B_M) | LP5521_RUN_B;
+	}
+
+	lp55xx_write(chip, LP5521_REG_OP_MODE, mode);
+	lp5521_wait_opmode_done();
+
+	lp55xx_update_bits(chip, LP5521_REG_ENABLE, LP5521_EXEC_M, exec);
+	lp5521_wait_enable_done();
+}
+
+static int lp5521_update_program_memory(struct lp55xx_chip *chip,
+					const u8 *data, size_t size)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 pattern[LP5521_PROGRAM_LENGTH] = {0};
+	u8 addr[] = {
+		[LP55XX_ENGINE_1] = LP5521_REG_R_PROG_MEM,
+		[LP55XX_ENGINE_2] = LP5521_REG_G_PROG_MEM,
+		[LP55XX_ENGINE_3] = LP5521_REG_B_PROG_MEM,
+	};
+	unsigned cmd;
+	char c[3];
+	int nrchars;
+	int ret;
+	int offset = 0;
+	int i = 0;
+
+	while ((offset < size - 1) && (i < LP5521_PROGRAM_LENGTH)) {
+		/* separate sscanfs because length is working only for %s */
+		ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
+		if (ret != 1)
+			goto err;
+
+		ret = sscanf(c, "%2x", &cmd);
+		if (ret != 1)
+			goto err;
+
+		pattern[i] = (u8)cmd;
+		offset += nrchars;
+		i++;
+	}
+
+	/* Each instruction is 16bit long. Check that length is even */
+	if (i % 2)
+		goto err;
+
+	for (i = 0; i < LP5521_PROGRAM_LENGTH; i++) {
+		ret = lp55xx_write(chip, addr[idx] + i, pattern[i]);
+		if (ret)
+			return -EINVAL;
+	}
+
+	return size;
+
+err:
+	dev_err(&chip->cl->dev, "wrong pattern format\n");
+	return -EINVAL;
+}
+
+static void lp5521_firmware_loaded(struct lp55xx_chip *chip)
+{
+	const struct firmware *fw = chip->fw;
+
+	if (fw->size > LP5521_PROGRAM_LENGTH) {
+		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
+			fw->size);
+		return;
+	}
+
+	/*
+	 * Program momery sequence
+	 *  1) set engine mode to "LOAD"
+	 *  2) write firmware data into program memory
+	 */
+
+	lp5521_load_engine(chip);
+	lp5521_update_program_memory(chip, fw->data, fw->size);
+}
+
+static int lp5521_post_init_device(struct lp55xx_chip *chip)
+{
+	int ret;
+	u8 val;
+
+	/*
+	 * Make sure that the chip is reset by reading back the r channel
+	 * current reg. This is dummy read is required on some platforms -
+	 * otherwise further access to the R G B channels in the
+	 * LP5521_REG_ENABLE register will not have any effect - strange!
+	 */
+	ret = lp55xx_read(chip, LP5521_REG_R_CURRENT, &val);
+	if (ret) {
+		dev_err(&chip->cl->dev, "error in resetting chip\n");
+		return ret;
+	}
+	if (val != LP5521_REG_R_CURR_DEFAULT) {
+		dev_err(&chip->cl->dev,
+			"unexpected data in register (expected 0x%x got 0x%x)\n",
+			LP5521_REG_R_CURR_DEFAULT, val);
+		ret = -EINVAL;
+		return ret;
+	}
+	usleep_range(10000, 20000);
+
+	/* Set all PWMs to direct control mode */
+	ret = lp55xx_write(chip, LP5521_REG_OP_MODE, LP5521_CMD_DIRECT);
+
+	/* Update configuration for the clock setting */
+	val = LP5521_DEFAULT_CFG;
+	if (!lp55xx_is_extclk_used(chip))
+		val |= LP5521_CLK_INT;
+
+	ret = lp55xx_write(chip, LP5521_REG_CONFIG, val);
+	if (ret)
+		return ret;
+
+	/* Initialize all channels PWM to zero -> leds off */
+	lp55xx_write(chip, LP5521_REG_R_PWM, 0);
+	lp55xx_write(chip, LP5521_REG_G_PWM, 0);
+	lp55xx_write(chip, LP5521_REG_B_PWM, 0);
+
+	/* Set engines are set to run state when OP_MODE enables engines */
+	ret = lp55xx_write(chip, LP5521_REG_ENABLE, LP5521_ENABLE_RUN_PROGRAM);
+	if (ret)
+		return ret;
+
+	lp5521_wait_enable_done();
+
+	return 0;
+}
+
+static int lp5521_run_selftest(struct lp55xx_chip *chip, char *buf)
+{
+	struct lp55xx_platform_data *pdata = chip->pdata;
+	int ret;
+	u8 status;
+
+	ret = lp55xx_read(chip, LP5521_REG_STATUS, &status);
+	if (ret < 0)
+		return ret;
+
+	if (pdata->clock_mode != LP55XX_CLOCK_EXT)
+		return 0;
+
+	/* Check that ext clock is really in use if requested */
+	if  ((status & LP5521_EXT_CLK_USED) == 0)
+		return -EIO;
+
+	return 0;
+}
+
+static void lp5521_led_brightness_work(struct work_struct *work)
+{
+	struct lp55xx_led *led = container_of(work, struct lp55xx_led,
+					      brightness_work);
+	struct lp55xx_chip *chip = led->chip;
+
+	mutex_lock(&chip->lock);
+	lp55xx_write(chip, LP5521_REG_LED_PWM_BASE + led->chan_nr,
+		led->brightness);
+	mutex_unlock(&chip->lock);
+}
+
+static ssize_t show_engine_mode(struct device *dev,
+				struct device_attribute *attr,
+				char *buf, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
+
+	switch (mode) {
+	case LP55XX_ENGINE_RUN:
+		return sprintf(buf, "run\n");
+	case LP55XX_ENGINE_LOAD:
+		return sprintf(buf, "load\n");
+	case LP55XX_ENGINE_DISABLED:
+	default:
+		return sprintf(buf, "disabled\n");
+	}
+}
+show_mode(1)
+show_mode(2)
+show_mode(3)
+
+static ssize_t store_engine_mode(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t len, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	struct lp55xx_engine *engine = &chip->engines[nr - 1];
+
+	mutex_lock(&chip->lock);
+
+	chip->engine_idx = nr;
+
+	if (!strncmp(buf, "run", 3)) {
+		lp5521_run_engine(chip, true);
+		engine->mode = LP55XX_ENGINE_RUN;
+	} else if (!strncmp(buf, "load", 4)) {
+		lp5521_stop_engine(chip);
+		lp5521_load_engine(chip);
+		engine->mode = LP55XX_ENGINE_LOAD;
+	} else if (!strncmp(buf, "disabled", 8)) {
+		lp5521_stop_engine(chip);
+		engine->mode = LP55XX_ENGINE_DISABLED;
+	}
+
+	mutex_unlock(&chip->lock);
+
+	return len;
+}
+store_mode(1)
+store_mode(2)
+store_mode(3)
+
+static ssize_t store_engine_load(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	int ret;
+
+	mutex_lock(&chip->lock);
+
+	chip->engine_idx = nr;
+	lp5521_load_engine(chip);
+	ret = lp5521_update_program_memory(chip, buf, len);
+
+	mutex_unlock(&chip->lock);
+
+	return ret;
+}
+store_load(1)
+store_load(2)
+store_load(3)
+
+static ssize_t lp5521_selftest(struct device *dev,
+			       struct device_attribute *attr,
+			       char *buf)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	int ret;
+
+	mutex_lock(&chip->lock);
+	ret = lp5521_run_selftest(chip, buf);
+	mutex_unlock(&chip->lock);
+
+	return scnprintf(buf, PAGE_SIZE, "%s\n", ret ? "FAIL" : "OK");
+}
+
+/* device attributes */
+static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
+static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
+static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
+static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
+static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
+static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
+static LP55XX_DEV_ATTR_RO(selftest, lp5521_selftest);
+
+static struct attribute *lp5521_attributes[] = {
+	&dev_attr_engine1_mode.attr,
+	&dev_attr_engine2_mode.attr,
+	&dev_attr_engine3_mode.attr,
+	&dev_attr_engine1_load.attr,
+	&dev_attr_engine2_load.attr,
+	&dev_attr_engine3_load.attr,
+	&dev_attr_selftest.attr,
+	NULL
+};
+
+static const struct attribute_group lp5521_group = {
+	.attrs = lp5521_attributes,
+};
+
+/* Chip specific configurations */
+static struct lp55xx_device_config lp5521_cfg = {
+	.reset = {
+		.addr = LP5521_REG_RESET,
+		.val  = LP5521_RESET,
+	},
+	.enable = {
+		.addr = LP5521_REG_ENABLE,
+		.val  = LP5521_ENABLE_DEFAULT,
+	},
+	.max_channel  = LP5521_MAX_LEDS,
+	.post_init_device   = lp5521_post_init_device,
+	.brightness_work_fn = lp5521_led_brightness_work,
+	.set_led_current    = lp5521_set_led_current,
+	.firmware_cb        = lp5521_firmware_loaded,
+	.run_engine         = lp5521_run_engine,
+	.dev_attr_group     = &lp5521_group,
+};
+
+static int lp5521_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int ret;
+	struct lp55xx_chip *chip;
+	struct lp55xx_led *led;
+	struct lp55xx_platform_data *pdata;
+	struct device_node *np = client->dev.of_node;
+
+	if (!dev_get_platdata(&client->dev)) {
+		if (np) {
+			ret = lp55xx_of_populate_pdata(&client->dev, np);
+			if (ret < 0)
+				return ret;
+		} else {
+			dev_err(&client->dev, "no platform data\n");
+			return -EINVAL;
+		}
+	}
+	pdata = dev_get_platdata(&client->dev);
+
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	led = devm_kzalloc(&client->dev,
+			sizeof(*led) * pdata->num_channels, GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	chip->cl = client;
+	chip->pdata = pdata;
+	chip->cfg = &lp5521_cfg;
+
+	mutex_init(&chip->lock);
+
+	i2c_set_clientdata(client, led);
+
+	ret = lp55xx_init_device(chip);
+	if (ret)
+		goto err_init;
+
+	dev_info(&client->dev, "%s programmable led chip found\n", id->name);
+
+	ret = lp55xx_register_leds(led, chip);
+	if (ret)
+		goto err_register_leds;
+
+	ret = lp55xx_register_sysfs(chip);
+	if (ret) {
+		dev_err(&client->dev, "registering sysfs failed\n");
+		goto err_register_sysfs;
+	}
+
+	return 0;
+
+err_register_sysfs:
+	lp55xx_unregister_leds(led, chip);
+err_register_leds:
+	lp55xx_deinit_device(chip);
+err_init:
+	return ret;
+}
+
+static int lp5521_remove(struct i2c_client *client)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(client);
+	struct lp55xx_chip *chip = led->chip;
+
+	lp5521_stop_all_engines(chip);
+	lp55xx_unregister_sysfs(chip);
+	lp55xx_unregister_leds(led, chip);
+	lp55xx_deinit_device(chip);
+
+	return 0;
+}
+
+static const struct i2c_device_id lp5521_id[] = {
+	{ "lp5521", 0 }, /* Three channel chip */
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lp5521_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_lp5521_leds_match[] = {
+	{ .compatible = "national,lp5521", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, of_lp5521_leds_match);
+#endif
+static struct i2c_driver lp5521_driver = {
+	.driver = {
+		.name	= "lp5521",
+		.of_match_table = of_match_ptr(of_lp5521_leds_match),
+	},
+	.probe		= lp5521_probe,
+	.remove		= lp5521_remove,
+	.id_table	= lp5521_id,
+};
+
+module_i2c_driver(lp5521_driver);
+
+MODULE_AUTHOR("Mathias Nyman, Yuri Zaporozhets, Samu Onkalo");
+MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
+MODULE_DESCRIPTION("LP5521 LED engine");
+MODULE_LICENSE("GPL v2");

drivers/leds/leds-lp5523.c

@@ -0,0 +1,839 @@
+/*
+ * lp5523.c - LP5523, LP55231 LED Driver
+ *
+ * Copyright (C) 2010 Nokia Corporation
+ * Copyright (C) 2012 Texas Instruments
+ *
+ * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
+ *          Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_data/leds-lp55xx.h>
+#include <linux/slab.h>
+
+#include "leds-lp55xx-common.h"
+
+#define LP5523_PROGRAM_LENGTH		32	/* bytes */
+/* Memory is used like this:
+   0x00 engine 1 program
+   0x10 engine 2 program
+   0x20 engine 3 program
+   0x30 engine 1 muxing info
+   0x40 engine 2 muxing info
+   0x50 engine 3 muxing info
+*/
+#define LP5523_MAX_LEDS			9
+
+/* Registers */
+#define LP5523_REG_ENABLE		0x00
+#define LP5523_REG_OP_MODE		0x01
+#define LP5523_REG_ENABLE_LEDS_MSB	0x04
+#define LP5523_REG_ENABLE_LEDS_LSB	0x05
+#define LP5523_REG_LED_PWM_BASE		0x16
+#define LP5523_REG_LED_CURRENT_BASE	0x26
+#define LP5523_REG_CONFIG		0x36
+#define LP5523_REG_STATUS		0x3A
+#define LP5523_REG_RESET		0x3D
+#define LP5523_REG_LED_TEST_CTRL	0x41
+#define LP5523_REG_LED_TEST_ADC		0x42
+#define LP5523_REG_CH1_PROG_START	0x4C
+#define LP5523_REG_CH2_PROG_START	0x4D
+#define LP5523_REG_CH3_PROG_START	0x4E
+#define LP5523_REG_PROG_PAGE_SEL	0x4F
+#define LP5523_REG_PROG_MEM		0x50
+
+/* Bit description in registers */
+#define LP5523_ENABLE			0x40
+#define LP5523_AUTO_INC			0x40
+#define LP5523_PWR_SAVE			0x20
+#define LP5523_PWM_PWR_SAVE		0x04
+#define LP5523_CP_AUTO			0x18
+#define LP5523_AUTO_CLK			0x02
+
+#define LP5523_EN_LEDTEST		0x80
+#define LP5523_LEDTEST_DONE		0x80
+#define LP5523_RESET			0xFF
+#define LP5523_ADC_SHORTCIRC_LIM	80
+#define LP5523_EXT_CLK_USED		0x08
+#define LP5523_ENG_STATUS_MASK		0x07
+
+/* Memory Page Selection */
+#define LP5523_PAGE_ENG1		0
+#define LP5523_PAGE_ENG2		1
+#define LP5523_PAGE_ENG3		2
+#define LP5523_PAGE_MUX1		3
+#define LP5523_PAGE_MUX2		4
+#define LP5523_PAGE_MUX3		5
+
+/* Program Memory Operations */
+#define LP5523_MODE_ENG1_M		0x30	/* Operation Mode Register */
+#define LP5523_MODE_ENG2_M		0x0C
+#define LP5523_MODE_ENG3_M		0x03
+#define LP5523_LOAD_ENG1		0x10
+#define LP5523_LOAD_ENG2		0x04
+#define LP5523_LOAD_ENG3		0x01
+
+#define LP5523_ENG1_IS_LOADING(mode)	\
+	((mode & LP5523_MODE_ENG1_M) == LP5523_LOAD_ENG1)
+#define LP5523_ENG2_IS_LOADING(mode)	\
+	((mode & LP5523_MODE_ENG2_M) == LP5523_LOAD_ENG2)
+#define LP5523_ENG3_IS_LOADING(mode)	\
+	((mode & LP5523_MODE_ENG3_M) == LP5523_LOAD_ENG3)
+
+#define LP5523_EXEC_ENG1_M		0x30	/* Enable Register */
+#define LP5523_EXEC_ENG2_M		0x0C
+#define LP5523_EXEC_ENG3_M		0x03
+#define LP5523_EXEC_M			0x3F
+#define LP5523_RUN_ENG1			0x20
+#define LP5523_RUN_ENG2			0x08
+#define LP5523_RUN_ENG3			0x02
+
+#define LED_ACTIVE(mux, led)		(!!(mux & (0x0001 << led)))
+
+enum lp5523_chip_id {
+	LP5523,
+	LP55231,
+};
+
+static int lp5523_init_program_engine(struct lp55xx_chip *chip);
+
+static inline void lp5523_wait_opmode_done(void)
+{
+	usleep_range(1000, 2000);
+}
+
+static void lp5523_set_led_current(struct lp55xx_led *led, u8 led_current)
+{
+	led->led_current = led_current;
+	lp55xx_write(led->chip, LP5523_REG_LED_CURRENT_BASE + led->chan_nr,
+		led_current);
+}
+
+static int lp5523_post_init_device(struct lp55xx_chip *chip)
+{
+	int ret;
+
+	ret = lp55xx_write(chip, LP5523_REG_ENABLE, LP5523_ENABLE);
+	if (ret)
+		return ret;
+
+	/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
+	usleep_range(1000, 2000);
+
+	ret = lp55xx_write(chip, LP5523_REG_CONFIG,
+			    LP5523_AUTO_INC | LP5523_PWR_SAVE |
+			    LP5523_CP_AUTO | LP5523_AUTO_CLK |
+			    LP5523_PWM_PWR_SAVE);
+	if (ret)
+		return ret;
+
+	/* turn on all leds */
+	ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_MSB, 0x01);
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5523_REG_ENABLE_LEDS_LSB, 0xff);
+	if (ret)
+		return ret;
+
+	return lp5523_init_program_engine(chip);
+}
+
+static void lp5523_load_engine(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 mask[] = {
+		[LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
+		[LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
+		[LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
+	};
+
+	u8 val[] = {
+		[LP55XX_ENGINE_1] = LP5523_LOAD_ENG1,
+		[LP55XX_ENGINE_2] = LP5523_LOAD_ENG2,
+		[LP55XX_ENGINE_3] = LP5523_LOAD_ENG3,
+	};
+
+	lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], val[idx]);
+
+	lp5523_wait_opmode_done();
+}
+
+static void lp5523_load_engine_and_select_page(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 page_sel[] = {
+		[LP55XX_ENGINE_1] = LP5523_PAGE_ENG1,
+		[LP55XX_ENGINE_2] = LP5523_PAGE_ENG2,
+		[LP55XX_ENGINE_3] = LP5523_PAGE_ENG3,
+	};
+
+	lp5523_load_engine(chip);
+
+	lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, page_sel[idx]);
+}
+
+static void lp5523_stop_all_engines(struct lp55xx_chip *chip)
+{
+	lp55xx_write(chip, LP5523_REG_OP_MODE, 0);
+	lp5523_wait_opmode_done();
+}
+
+static void lp5523_stop_engine(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 mask[] = {
+		[LP55XX_ENGINE_1] = LP5523_MODE_ENG1_M,
+		[LP55XX_ENGINE_2] = LP5523_MODE_ENG2_M,
+		[LP55XX_ENGINE_3] = LP5523_MODE_ENG3_M,
+	};
+
+	lp55xx_update_bits(chip, LP5523_REG_OP_MODE, mask[idx], 0);
+
+	lp5523_wait_opmode_done();
+}
+
+static void lp5523_turn_off_channels(struct lp55xx_chip *chip)
+{
+	int i;
+
+	for (i = 0; i < LP5523_MAX_LEDS; i++)
+		lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0);
+}
+
+static void lp5523_run_engine(struct lp55xx_chip *chip, bool start)
+{
+	int ret;
+	u8 mode;
+	u8 exec;
+
+	/* stop engine */
+	if (!start) {
+		lp5523_stop_engine(chip);
+		lp5523_turn_off_channels(chip);
+		return;
+	}
+
+	/*
+	 * To run the engine,
+	 * operation mode and enable register should updated at the same time
+	 */
+
+	ret = lp55xx_read(chip, LP5523_REG_OP_MODE, &mode);
+	if (ret)
+		return;
+
+	ret = lp55xx_read(chip, LP5523_REG_ENABLE, &exec);
+	if (ret)
+		return;
+
+	/* change operation mode to RUN only when each engine is loading */
+	if (LP5523_ENG1_IS_LOADING(mode)) {
+		mode = (mode & ~LP5523_MODE_ENG1_M) | LP5523_RUN_ENG1;
+		exec = (exec & ~LP5523_EXEC_ENG1_M) | LP5523_RUN_ENG1;
+	}
+
+	if (LP5523_ENG2_IS_LOADING(mode)) {
+		mode = (mode & ~LP5523_MODE_ENG2_M) | LP5523_RUN_ENG2;
+		exec = (exec & ~LP5523_EXEC_ENG2_M) | LP5523_RUN_ENG2;
+	}
+
+	if (LP5523_ENG3_IS_LOADING(mode)) {
+		mode = (mode & ~LP5523_MODE_ENG3_M) | LP5523_RUN_ENG3;
+		exec = (exec & ~LP5523_EXEC_ENG3_M) | LP5523_RUN_ENG3;
+	}
+
+	lp55xx_write(chip, LP5523_REG_OP_MODE, mode);
+	lp5523_wait_opmode_done();
+
+	lp55xx_update_bits(chip, LP5523_REG_ENABLE, LP5523_EXEC_M, exec);
+}
+
+static int lp5523_init_program_engine(struct lp55xx_chip *chip)
+{
+	int i;
+	int j;
+	int ret;
+	u8 status;
+	/* one pattern per engine setting LED MUX start and stop addresses */
+	static const u8 pattern[][LP5523_PROGRAM_LENGTH] =  {
+		{ 0x9c, 0x30, 0x9c, 0xb0, 0x9d, 0x80, 0xd8, 0x00, 0},
+		{ 0x9c, 0x40, 0x9c, 0xc0, 0x9d, 0x80, 0xd8, 0x00, 0},
+		{ 0x9c, 0x50, 0x9c, 0xd0, 0x9d, 0x80, 0xd8, 0x00, 0},
+	};
+
+	/* hardcode 32 bytes of memory for each engine from program memory */
+	ret = lp55xx_write(chip, LP5523_REG_CH1_PROG_START, 0x00);
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5523_REG_CH2_PROG_START, 0x10);
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5523_REG_CH3_PROG_START, 0x20);
+	if (ret)
+		return ret;
+
+	/* write LED MUX address space for each engine */
+	for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
+		chip->engine_idx = i;
+		lp5523_load_engine_and_select_page(chip);
+
+		for (j = 0; j < LP5523_PROGRAM_LENGTH; j++) {
+			ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + j,
+					pattern[i - 1][j]);
+			if (ret)
+				goto out;
+		}
+	}
+
+	lp5523_run_engine(chip, true);
+
+	/* Let the programs run for couple of ms and check the engine status */
+	usleep_range(3000, 6000);
+	lp55xx_read(chip, LP5523_REG_STATUS, &status);
+	status &= LP5523_ENG_STATUS_MASK;
+
+	if (status != LP5523_ENG_STATUS_MASK) {
+		dev_err(&chip->cl->dev,
+			"cound not configure LED engine, status = 0x%.2x\n",
+			status);
+		ret = -1;
+	}
+
+out:
+	lp5523_stop_all_engines(chip);
+	return ret;
+}
+
+static int lp5523_update_program_memory(struct lp55xx_chip *chip,
+					const u8 *data, size_t size)
+{
+	u8 pattern[LP5523_PROGRAM_LENGTH] = {0};
+	unsigned cmd;
+	char c[3];
+	int nrchars;
+	int ret;
+	int offset = 0;
+	int i = 0;
+
+	while ((offset < size - 1) && (i < LP5523_PROGRAM_LENGTH)) {
+		/* separate sscanfs because length is working only for %s */
+		ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
+		if (ret != 1)
+			goto err;
+
+		ret = sscanf(c, "%2x", &cmd);
+		if (ret != 1)
+			goto err;
+
+		pattern[i] = (u8)cmd;
+		offset += nrchars;
+		i++;
+	}
+
+	/* Each instruction is 16bit long. Check that length is even */
+	if (i % 2)
+		goto err;
+
+	for (i = 0; i < LP5523_PROGRAM_LENGTH; i++) {
+		ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + i, pattern[i]);
+		if (ret)
+			return -EINVAL;
+	}
+
+	return size;
+
+err:
+	dev_err(&chip->cl->dev, "wrong pattern format\n");
+	return -EINVAL;
+}
+
+static void lp5523_firmware_loaded(struct lp55xx_chip *chip)
+{
+	const struct firmware *fw = chip->fw;
+
+	if (fw->size > LP5523_PROGRAM_LENGTH) {
+		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
+			fw->size);
+		return;
+	}
+
+	/*
+	 * Program momery sequence
+	 *  1) set engine mode to "LOAD"
+	 *  2) write firmware data into program memory
+	 */
+
+	lp5523_load_engine_and_select_page(chip);
+	lp5523_update_program_memory(chip, fw->data, fw->size);
+}
+
+static ssize_t show_engine_mode(struct device *dev,
+				struct device_attribute *attr,
+				char *buf, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	enum lp55xx_engine_mode mode = chip->engines[nr - 1].mode;
+
+	switch (mode) {
+	case LP55XX_ENGINE_RUN:
+		return sprintf(buf, "run\n");
+	case LP55XX_ENGINE_LOAD:
+		return sprintf(buf, "load\n");
+	case LP55XX_ENGINE_DISABLED:
+	default:
+		return sprintf(buf, "disabled\n");
+	}
+}
+show_mode(1)
+show_mode(2)
+show_mode(3)
+
+static ssize_t store_engine_mode(struct device *dev,
+				 struct device_attribute *attr,
+				 const char *buf, size_t len, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	struct lp55xx_engine *engine = &chip->engines[nr - 1];
+
+	mutex_lock(&chip->lock);
+
+	chip->engine_idx = nr;
+
+	if (!strncmp(buf, "run", 3)) {
+		lp5523_run_engine(chip, true);
+		engine->mode = LP55XX_ENGINE_RUN;
+	} else if (!strncmp(buf, "load", 4)) {
+		lp5523_stop_engine(chip);
+		lp5523_load_engine(chip);
+		engine->mode = LP55XX_ENGINE_LOAD;
+	} else if (!strncmp(buf, "disabled", 8)) {
+		lp5523_stop_engine(chip);
+		engine->mode = LP55XX_ENGINE_DISABLED;
+	}
+
+	mutex_unlock(&chip->lock);
+
+	return len;
+}
+store_mode(1)
+store_mode(2)
+store_mode(3)
+
+static int lp5523_mux_parse(const char *buf, u16 *mux, size_t len)
+{
+	u16 tmp_mux = 0;
+	int i;
+
+	len = min_t(int, len, LP5523_MAX_LEDS);
+
+	for (i = 0; i < len; i++) {
+		switch (buf[i]) {
+		case '1':
+			tmp_mux |= (1 << i);
+			break;
+		case '0':
+			break;
+		case '\n':
+			i = len;
+			break;
+		default:
+			return -1;
+		}
+	}
+	*mux = tmp_mux;
+
+	return 0;
+}
+
+static void lp5523_mux_to_array(u16 led_mux, char *array)
+{
+	int i, pos = 0;
+	for (i = 0; i < LP5523_MAX_LEDS; i++)
+		pos += sprintf(array + pos, "%x", LED_ACTIVE(led_mux, i));
+
+	array[pos] = '\0';
+}
+
+static ssize_t show_engine_leds(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	char mux[LP5523_MAX_LEDS + 1];
+
+	lp5523_mux_to_array(chip->engines[nr - 1].led_mux, mux);
+
+	return sprintf(buf, "%s\n", mux);
+}
+show_leds(1)
+show_leds(2)
+show_leds(3)
+
+static int lp5523_load_mux(struct lp55xx_chip *chip, u16 mux, int nr)
+{
+	struct lp55xx_engine *engine = &chip->engines[nr - 1];
+	int ret;
+	u8 mux_page[] = {
+		[LP55XX_ENGINE_1] = LP5523_PAGE_MUX1,
+		[LP55XX_ENGINE_2] = LP5523_PAGE_MUX2,
+		[LP55XX_ENGINE_3] = LP5523_PAGE_MUX3,
+	};
+
+	lp5523_load_engine(chip);
+
+	ret = lp55xx_write(chip, LP5523_REG_PROG_PAGE_SEL, mux_page[nr]);
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5523_REG_PROG_MEM , (u8)(mux >> 8));
+	if (ret)
+		return ret;
+
+	ret = lp55xx_write(chip, LP5523_REG_PROG_MEM + 1, (u8)(mux));
+	if (ret)
+		return ret;
+
+	engine->led_mux = mux;
+	return 0;
+}
+
+static ssize_t store_engine_leds(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	struct lp55xx_engine *engine = &chip->engines[nr - 1];
+	u16 mux = 0;
+	ssize_t ret;
+
+	if (lp5523_mux_parse(buf, &mux, len))
+		return -EINVAL;
+
+	mutex_lock(&chip->lock);
+
+	chip->engine_idx = nr;
+	ret = -EINVAL;
+
+	if (engine->mode != LP55XX_ENGINE_LOAD)
+		goto leave;
+
+	if (lp5523_load_mux(chip, mux, nr))
+		goto leave;
+
+	ret = len;
+leave:
+	mutex_unlock(&chip->lock);
+	return ret;
+}
+store_leds(1)
+store_leds(2)
+store_leds(3)
+
+static ssize_t store_engine_load(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len, int nr)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	int ret;
+
+	mutex_lock(&chip->lock);
+
+	chip->engine_idx = nr;
+	lp5523_load_engine_and_select_page(chip);
+	ret = lp5523_update_program_memory(chip, buf, len);
+
+	mutex_unlock(&chip->lock);
+
+	return ret;
+}
+store_load(1)
+store_load(2)
+store_load(3)
+
+static ssize_t lp5523_selftest(struct device *dev,
+			       struct device_attribute *attr,
+			       char *buf)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	struct lp55xx_platform_data *pdata = chip->pdata;
+	int i, ret, pos = 0;
+	u8 status, adc, vdd;
+
+	mutex_lock(&chip->lock);
+
+	ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
+	if (ret < 0)
+		goto fail;
+
+	/* Check that ext clock is really in use if requested */
+	if (pdata->clock_mode == LP55XX_CLOCK_EXT) {
+		if  ((status & LP5523_EXT_CLK_USED) == 0)
+			goto fail;
+	}
+
+	/* Measure VDD (i.e. VBAT) first (channel 16 corresponds to VDD) */
+	lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL, LP5523_EN_LEDTEST | 16);
+	usleep_range(3000, 6000); /* ADC conversion time is typically 2.7 ms */
+	ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
+	if (ret < 0)
+		goto fail;
+
+	if (!(status & LP5523_LEDTEST_DONE))
+		usleep_range(3000, 6000); /* Was not ready. Wait little bit */
+
+	ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &vdd);
+	if (ret < 0)
+		goto fail;
+
+	vdd--;	/* There may be some fluctuation in measurement */
+
+	for (i = 0; i < LP5523_MAX_LEDS; i++) {
+		/* Skip non-existing channels */
+		if (pdata->led_config[i].led_current == 0)
+			continue;
+
+		/* Set default current */
+		lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
+			pdata->led_config[i].led_current);
+
+		lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0xff);
+		/* let current stabilize 2 - 4ms before measurements start */
+		usleep_range(2000, 4000);
+		lp55xx_write(chip, LP5523_REG_LED_TEST_CTRL,
+			     LP5523_EN_LEDTEST | i);
+		/* ADC conversion time is 2.7 ms typically */
+		usleep_range(3000, 6000);
+		ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
+		if (ret < 0)
+			goto fail;
+
+		if (!(status & LP5523_LEDTEST_DONE))
+			usleep_range(3000, 6000);/* Was not ready. Wait. */
+
+		ret = lp55xx_read(chip, LP5523_REG_LED_TEST_ADC, &adc);
+		if (ret < 0)
+			goto fail;
+
+		if (adc >= vdd || adc < LP5523_ADC_SHORTCIRC_LIM)
+			pos += sprintf(buf + pos, "LED %d FAIL\n", i);
+
+		lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + i, 0x00);
+
+		/* Restore current */
+		lp55xx_write(chip, LP5523_REG_LED_CURRENT_BASE + i,
+			led->led_current);
+		led++;
+	}
+	if (pos == 0)
+		pos = sprintf(buf, "OK\n");
+	goto release_lock;
+fail:
+	pos = sprintf(buf, "FAIL\n");
+
+release_lock:
+	mutex_unlock(&chip->lock);
+
+	return pos;
+}
+
+static void lp5523_led_brightness_work(struct work_struct *work)
+{
+	struct lp55xx_led *led = container_of(work, struct lp55xx_led,
+					      brightness_work);
+	struct lp55xx_chip *chip = led->chip;
+
+	mutex_lock(&chip->lock);
+	lp55xx_write(chip, LP5523_REG_LED_PWM_BASE + led->chan_nr,
+		     led->brightness);
+	mutex_unlock(&chip->lock);
+}
+
+static LP55XX_DEV_ATTR_RW(engine1_mode, show_engine1_mode, store_engine1_mode);
+static LP55XX_DEV_ATTR_RW(engine2_mode, show_engine2_mode, store_engine2_mode);
+static LP55XX_DEV_ATTR_RW(engine3_mode, show_engine3_mode, store_engine3_mode);
+static LP55XX_DEV_ATTR_RW(engine1_leds, show_engine1_leds, store_engine1_leds);
+static LP55XX_DEV_ATTR_RW(engine2_leds, show_engine2_leds, store_engine2_leds);
+static LP55XX_DEV_ATTR_RW(engine3_leds, show_engine3_leds, store_engine3_leds);
+static LP55XX_DEV_ATTR_WO(engine1_load, store_engine1_load);
+static LP55XX_DEV_ATTR_WO(engine2_load, store_engine2_load);
+static LP55XX_DEV_ATTR_WO(engine3_load, store_engine3_load);
+static LP55XX_DEV_ATTR_RO(selftest, lp5523_selftest);
+
+static struct attribute *lp5523_attributes[] = {
+	&dev_attr_engine1_mode.attr,
+	&dev_attr_engine2_mode.attr,
+	&dev_attr_engine3_mode.attr,
+	&dev_attr_engine1_load.attr,
+	&dev_attr_engine2_load.attr,
+	&dev_attr_engine3_load.attr,
+	&dev_attr_engine1_leds.attr,
+	&dev_attr_engine2_leds.attr,
+	&dev_attr_engine3_leds.attr,
+	&dev_attr_selftest.attr,
+	NULL,
+};
+
+static const struct attribute_group lp5523_group = {
+	.attrs = lp5523_attributes,
+};
+
+/* Chip specific configurations */
+static struct lp55xx_device_config lp5523_cfg = {
+	.reset = {
+		.addr = LP5523_REG_RESET,
+		.val  = LP5523_RESET,
+	},
+	.enable = {
+		.addr = LP5523_REG_ENABLE,
+		.val  = LP5523_ENABLE,
+	},
+	.max_channel  = LP5523_MAX_LEDS,
+	.post_init_device   = lp5523_post_init_device,
+	.brightness_work_fn = lp5523_led_brightness_work,
+	.set_led_current    = lp5523_set_led_current,
+	.firmware_cb        = lp5523_firmware_loaded,
+	.run_engine         = lp5523_run_engine,
+	.dev_attr_group     = &lp5523_group,
+};
+
+static int lp5523_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int ret;
+	struct lp55xx_chip *chip;
+	struct lp55xx_led *led;
+	struct lp55xx_platform_data *pdata;
+	struct device_node *np = client->dev.of_node;
+
+	if (!dev_get_platdata(&client->dev)) {
+		if (np) {
+			ret = lp55xx_of_populate_pdata(&client->dev, np);
+			if (ret < 0)
+				return ret;
+		} else {
+			dev_err(&client->dev, "no platform data\n");
+			return -EINVAL;
+		}
+	}
+	pdata = dev_get_platdata(&client->dev);
+
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	led = devm_kzalloc(&client->dev,
+			sizeof(*led) * pdata->num_channels, GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	chip->cl = client;
+	chip->pdata = pdata;
+	chip->cfg = &lp5523_cfg;
+
+	mutex_init(&chip->lock);
+
+	i2c_set_clientdata(client, led);
+
+	ret = lp55xx_init_device(chip);
+	if (ret)
+		goto err_init;
+
+	dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
+
+	ret = lp55xx_register_leds(led, chip);
+	if (ret)
+		goto err_register_leds;
+
+	ret = lp55xx_register_sysfs(chip);
+	if (ret) {
+		dev_err(&client->dev, "registering sysfs failed\n");
+		goto err_register_sysfs;
+	}
+
+	return 0;
+
+err_register_sysfs:
+	lp55xx_unregister_leds(led, chip);
+err_register_leds:
+	lp55xx_deinit_device(chip);
+err_init:
+	return ret;
+}
+
+static int lp5523_remove(struct i2c_client *client)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(client);
+	struct lp55xx_chip *chip = led->chip;
+
+	lp5523_stop_all_engines(chip);
+	lp55xx_unregister_sysfs(chip);
+	lp55xx_unregister_leds(led, chip);
+	lp55xx_deinit_device(chip);
+
+	return 0;
+}
+
+static const struct i2c_device_id lp5523_id[] = {
+	{ "lp5523",  LP5523 },
+	{ "lp55231", LP55231 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, lp5523_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_lp5523_leds_match[] = {
+	{ .compatible = "national,lp5523", },
+	{ .compatible = "ti,lp55231", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, of_lp5523_leds_match);
+#endif
+
+static struct i2c_driver lp5523_driver = {
+	.driver = {
+		.name	= "lp5523x",
+		.of_match_table = of_match_ptr(of_lp5523_leds_match),
+	},
+	.probe		= lp5523_probe,
+	.remove		= lp5523_remove,
+	.id_table	= lp5523_id,
+};
+
+module_i2c_driver(lp5523_driver);
+
+MODULE_AUTHOR("Mathias Nyman <mathias.nyman@nokia.com>");
+MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
+MODULE_DESCRIPTION("LP5523 LED engine");
+MODULE_LICENSE("GPL");

drivers/leds/leds-lp5562.c

@@ -0,0 +1,617 @@
+/*
+ * LP5562 LED driver
+ *
+ * Copyright (C) 2013 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_data/leds-lp55xx.h>
+#include <linux/slab.h>
+
+#include "leds-lp55xx-common.h"
+
+#define LP5562_PROGRAM_LENGTH		32
+#define LP5562_MAX_LEDS			4
+
+/* ENABLE Register 00h */
+#define LP5562_REG_ENABLE		0x00
+#define LP5562_EXEC_ENG1_M		0x30
+#define LP5562_EXEC_ENG2_M		0x0C
+#define LP5562_EXEC_ENG3_M		0x03
+#define LP5562_EXEC_M			0x3F
+#define LP5562_MASTER_ENABLE		0x40	/* Chip master enable */
+#define LP5562_LOGARITHMIC_PWM		0x80	/* Logarithmic PWM adjustment */
+#define LP5562_EXEC_RUN			0x2A
+#define LP5562_ENABLE_DEFAULT	\
+	(LP5562_MASTER_ENABLE | LP5562_LOGARITHMIC_PWM)
+#define LP5562_ENABLE_RUN_PROGRAM	\
+	(LP5562_ENABLE_DEFAULT | LP5562_EXEC_RUN)
+
+/* OPMODE Register 01h */
+#define LP5562_REG_OP_MODE		0x01
+#define LP5562_MODE_ENG1_M		0x30
+#define LP5562_MODE_ENG2_M		0x0C
+#define LP5562_MODE_ENG3_M		0x03
+#define LP5562_LOAD_ENG1		0x10
+#define LP5562_LOAD_ENG2		0x04
+#define LP5562_LOAD_ENG3		0x01
+#define LP5562_RUN_ENG1			0x20
+#define LP5562_RUN_ENG2			0x08
+#define LP5562_RUN_ENG3			0x02
+#define LP5562_ENG1_IS_LOADING(mode)	\
+	((mode & LP5562_MODE_ENG1_M) == LP5562_LOAD_ENG1)
+#define LP5562_ENG2_IS_LOADING(mode)	\
+	((mode & LP5562_MODE_ENG2_M) == LP5562_LOAD_ENG2)
+#define LP5562_ENG3_IS_LOADING(mode)	\
+	((mode & LP5562_MODE_ENG3_M) == LP5562_LOAD_ENG3)
+
+/* BRIGHTNESS Registers */
+#define LP5562_REG_R_PWM		0x04
+#define LP5562_REG_G_PWM		0x03
+#define LP5562_REG_B_PWM		0x02
+#define LP5562_REG_W_PWM		0x0E
+
+/* CURRENT Registers */
+#define LP5562_REG_R_CURRENT		0x07
+#define LP5562_REG_G_CURRENT		0x06
+#define LP5562_REG_B_CURRENT		0x05
+#define LP5562_REG_W_CURRENT		0x0F
+
+/* CONFIG Register 08h */
+#define LP5562_REG_CONFIG		0x08
+#define LP5562_PWM_HF			0x40
+#define LP5562_PWRSAVE_EN		0x20
+#define LP5562_CLK_INT			0x01	/* Internal clock */
+#define LP5562_DEFAULT_CFG		(LP5562_PWM_HF | LP5562_PWRSAVE_EN)
+
+/* RESET Register 0Dh */
+#define LP5562_REG_RESET		0x0D
+#define LP5562_RESET			0xFF
+
+/* PROGRAM ENGINE Registers */
+#define LP5562_REG_PROG_MEM_ENG1	0x10
+#define LP5562_REG_PROG_MEM_ENG2	0x30
+#define LP5562_REG_PROG_MEM_ENG3	0x50
+
+/* LEDMAP Register 70h */
+#define LP5562_REG_ENG_SEL		0x70
+#define LP5562_ENG_SEL_PWM		0
+#define LP5562_ENG_FOR_RGB_M		0x3F
+#define LP5562_ENG_SEL_RGB		0x1B	/* R:ENG1, G:ENG2, B:ENG3 */
+#define LP5562_ENG_FOR_W_M		0xC0
+#define LP5562_ENG1_FOR_W		0x40	/* W:ENG1 */
+#define LP5562_ENG2_FOR_W		0x80	/* W:ENG2 */
+#define LP5562_ENG3_FOR_W		0xC0	/* W:ENG3 */
+
+/* Program Commands */
+#define LP5562_CMD_DISABLE		0x00
+#define LP5562_CMD_LOAD			0x15
+#define LP5562_CMD_RUN			0x2A
+#define LP5562_CMD_DIRECT		0x3F
+#define LP5562_PATTERN_OFF		0
+
+static inline void lp5562_wait_opmode_done(void)
+{
+	/* operation mode change needs to be longer than 153 us */
+	usleep_range(200, 300);
+}
+
+static inline void lp5562_wait_enable_done(void)
+{
+	/* it takes more 488 us to update ENABLE register */
+	usleep_range(500, 600);
+}
+
+static void lp5562_set_led_current(struct lp55xx_led *led, u8 led_current)
+{
+	u8 addr[] = {
+		LP5562_REG_R_CURRENT,
+		LP5562_REG_G_CURRENT,
+		LP5562_REG_B_CURRENT,
+		LP5562_REG_W_CURRENT,
+	};
+
+	led->led_current = led_current;
+	lp55xx_write(led->chip, addr[led->chan_nr], led_current);
+}
+
+static void lp5562_load_engine(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 mask[] = {
+		[LP55XX_ENGINE_1] = LP5562_MODE_ENG1_M,
+		[LP55XX_ENGINE_2] = LP5562_MODE_ENG2_M,
+		[LP55XX_ENGINE_3] = LP5562_MODE_ENG3_M,
+	};
+
+	u8 val[] = {
+		[LP55XX_ENGINE_1] = LP5562_LOAD_ENG1,
+		[LP55XX_ENGINE_2] = LP5562_LOAD_ENG2,
+		[LP55XX_ENGINE_3] = LP5562_LOAD_ENG3,
+	};
+
+	lp55xx_update_bits(chip, LP5562_REG_OP_MODE, mask[idx], val[idx]);
+
+	lp5562_wait_opmode_done();
+}
+
+static void lp5562_stop_engine(struct lp55xx_chip *chip)
+{
+	lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DISABLE);
+	lp5562_wait_opmode_done();
+}
+
+static void lp5562_run_engine(struct lp55xx_chip *chip, bool start)
+{
+	int ret;
+	u8 mode;
+	u8 exec;
+
+	/* stop engine */
+	if (!start) {
+		lp55xx_write(chip, LP5562_REG_ENABLE, LP5562_ENABLE_DEFAULT);
+		lp5562_wait_enable_done();
+		lp5562_stop_engine(chip);
+		lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
+		lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
+		lp5562_wait_opmode_done();
+		return;
+	}
+
+	/*
+	 * To run the engine,
+	 * operation mode and enable register should updated at the same time
+	 */
+
+	ret = lp55xx_read(chip, LP5562_REG_OP_MODE, &mode);
+	if (ret)
+		return;
+
+	ret = lp55xx_read(chip, LP5562_REG_ENABLE, &exec);
+	if (ret)
+		return;
+
+	/* change operation mode to RUN only when each engine is loading */
+	if (LP5562_ENG1_IS_LOADING(mode)) {
+		mode = (mode & ~LP5562_MODE_ENG1_M) | LP5562_RUN_ENG1;
+		exec = (exec & ~LP5562_EXEC_ENG1_M) | LP5562_RUN_ENG1;
+	}
+
+	if (LP5562_ENG2_IS_LOADING(mode)) {
+		mode = (mode & ~LP5562_MODE_ENG2_M) | LP5562_RUN_ENG2;
+		exec = (exec & ~LP5562_EXEC_ENG2_M) | LP5562_RUN_ENG2;
+	}
+
+	if (LP5562_ENG3_IS_LOADING(mode)) {
+		mode = (mode & ~LP5562_MODE_ENG3_M) | LP5562_RUN_ENG3;
+		exec = (exec & ~LP5562_EXEC_ENG3_M) | LP5562_RUN_ENG3;
+	}
+
+	lp55xx_write(chip, LP5562_REG_OP_MODE, mode);
+	lp5562_wait_opmode_done();
+
+	lp55xx_update_bits(chip, LP5562_REG_ENABLE, LP5562_EXEC_M, exec);
+	lp5562_wait_enable_done();
+}
+
+static int lp5562_update_firmware(struct lp55xx_chip *chip,
+					const u8 *data, size_t size)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 pattern[LP5562_PROGRAM_LENGTH] = {0};
+	u8 addr[] = {
+		[LP55XX_ENGINE_1] = LP5562_REG_PROG_MEM_ENG1,
+		[LP55XX_ENGINE_2] = LP5562_REG_PROG_MEM_ENG2,
+		[LP55XX_ENGINE_3] = LP5562_REG_PROG_MEM_ENG3,
+	};
+	unsigned cmd;
+	char c[3];
+	int program_size;
+	int nrchars;
+	int offset = 0;
+	int ret;
+	int i;
+
+	/* clear program memory before updating */
+	for (i = 0; i < LP5562_PROGRAM_LENGTH; i++)
+		lp55xx_write(chip, addr[idx] + i, 0);
+
+	i = 0;
+	while ((offset < size - 1) && (i < LP5562_PROGRAM_LENGTH)) {
+		/* separate sscanfs because length is working only for %s */
+		ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
+		if (ret != 1)
+			goto err;
+
+		ret = sscanf(c, "%2x", &cmd);
+		if (ret != 1)
+			goto err;
+
+		pattern[i] = (u8)cmd;
+		offset += nrchars;
+		i++;
+	}
+
+	/* Each instruction is 16bit long. Check that length is even */
+	if (i % 2)
+		goto err;
+
+	program_size = i;
+	for (i = 0; i < program_size; i++)
+		lp55xx_write(chip, addr[idx] + i, pattern[i]);
+
+	return 0;
+
+err:
+	dev_err(&chip->cl->dev, "wrong pattern format\n");
+	return -EINVAL;
+}
+
+static void lp5562_firmware_loaded(struct lp55xx_chip *chip)
+{
+	const struct firmware *fw = chip->fw;
+
+	if (fw->size > LP5562_PROGRAM_LENGTH) {
+		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
+			fw->size);
+		return;
+	}
+
+	/*
+	 * Program momery sequence
+	 *  1) set engine mode to "LOAD"
+	 *  2) write firmware data into program memory
+	 */
+
+	lp5562_load_engine(chip);
+	lp5562_update_firmware(chip, fw->data, fw->size);
+}
+
+static int lp5562_post_init_device(struct lp55xx_chip *chip)
+{
+	int ret;
+	u8 cfg = LP5562_DEFAULT_CFG;
+
+	/* Set all PWMs to direct control mode */
+	ret = lp55xx_write(chip, LP5562_REG_OP_MODE, LP5562_CMD_DIRECT);
+	if (ret)
+		return ret;
+
+	lp5562_wait_opmode_done();
+
+	/* Update configuration for the clock setting */
+	if (!lp55xx_is_extclk_used(chip))
+		cfg |= LP5562_CLK_INT;
+
+	ret = lp55xx_write(chip, LP5562_REG_CONFIG, cfg);
+	if (ret)
+		return ret;
+
+	/* Initialize all channels PWM to zero -> leds off */
+	lp55xx_write(chip, LP5562_REG_R_PWM, 0);
+	lp55xx_write(chip, LP5562_REG_G_PWM, 0);
+	lp55xx_write(chip, LP5562_REG_B_PWM, 0);
+	lp55xx_write(chip, LP5562_REG_W_PWM, 0);
+
+	/* Set LED map as register PWM by default */
+	lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_PWM);
+
+	return 0;
+}
+
+static void lp5562_led_brightness_work(struct work_struct *work)
+{
+	struct lp55xx_led *led = container_of(work, struct lp55xx_led,
+					      brightness_work);
+	struct lp55xx_chip *chip = led->chip;
+	u8 addr[] = {
+		LP5562_REG_R_PWM,
+		LP5562_REG_G_PWM,
+		LP5562_REG_B_PWM,
+		LP5562_REG_W_PWM,
+	};
+
+	mutex_lock(&chip->lock);
+	lp55xx_write(chip, addr[led->chan_nr], led->brightness);
+	mutex_unlock(&chip->lock);
+}
+
+static void lp5562_write_program_memory(struct lp55xx_chip *chip,
+					u8 base, const u8 *rgb, int size)
+{
+	int i;
+
+	if (!rgb || size <= 0)
+		return;
+
+	for (i = 0; i < size; i++)
+		lp55xx_write(chip, base + i, *(rgb + i));
+
+	lp55xx_write(chip, base + i, 0);
+	lp55xx_write(chip, base + i + 1, 0);
+}
+
+/* check the size of program count */
+static inline bool _is_pc_overflow(struct lp55xx_predef_pattern *ptn)
+{
+	return ptn->size_r >= LP5562_PROGRAM_LENGTH ||
+	       ptn->size_g >= LP5562_PROGRAM_LENGTH ||
+	       ptn->size_b >= LP5562_PROGRAM_LENGTH;
+}
+
+static int lp5562_run_predef_led_pattern(struct lp55xx_chip *chip, int mode)
+{
+	struct lp55xx_predef_pattern *ptn;
+	int i;
+
+	if (mode == LP5562_PATTERN_OFF) {
+		lp5562_run_engine(chip, false);
+		return 0;
+	}
+
+	ptn = chip->pdata->patterns + (mode - 1);
+	if (!ptn || _is_pc_overflow(ptn)) {
+		dev_err(&chip->cl->dev, "invalid pattern data\n");
+		return -EINVAL;
+	}
+
+	lp5562_stop_engine(chip);
+
+	/* Set LED map as RGB */
+	lp55xx_write(chip, LP5562_REG_ENG_SEL, LP5562_ENG_SEL_RGB);
+
+	/* Load engines */
+	for (i = LP55XX_ENGINE_1; i <= LP55XX_ENGINE_3; i++) {
+		chip->engine_idx = i;
+		lp5562_load_engine(chip);
+	}
+
+	/* Clear program registers */
+	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1, 0);
+	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG1 + 1, 0);
+	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2, 0);
+	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG2 + 1, 0);
+	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3, 0);
+	lp55xx_write(chip, LP5562_REG_PROG_MEM_ENG3 + 1, 0);
+
+	/* Program engines */
+	lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG1,
+				ptn->r, ptn->size_r);
+	lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG2,
+				ptn->g, ptn->size_g);
+	lp5562_write_program_memory(chip, LP5562_REG_PROG_MEM_ENG3,
+				ptn->b, ptn->size_b);
+
+	/* Run engines */
+	lp5562_run_engine(chip, true);
+
+	return 0;
+}
+
+static ssize_t lp5562_store_pattern(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t len)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	struct lp55xx_predef_pattern *ptn = chip->pdata->patterns;
+	int num_patterns = chip->pdata->num_patterns;
+	unsigned long mode;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &mode);
+	if (ret)
+		return ret;
+
+	if (mode > num_patterns || !ptn)
+		return -EINVAL;
+
+	mutex_lock(&chip->lock);
+	ret = lp5562_run_predef_led_pattern(chip, mode);
+	mutex_unlock(&chip->lock);
+
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+static ssize_t lp5562_store_engine_mux(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t len)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	u8 mask;
+	u8 val;
+
+	/* LED map
+	 * R ... Engine 1 (fixed)
+	 * G ... Engine 2 (fixed)
+	 * B ... Engine 3 (fixed)
+	 * W ... Engine 1 or 2 or 3
+	 */
+
+	if (sysfs_streq(buf, "RGB")) {
+		mask = LP5562_ENG_FOR_RGB_M;
+		val = LP5562_ENG_SEL_RGB;
+	} else if (sysfs_streq(buf, "W")) {
+		enum lp55xx_engine_index idx = chip->engine_idx;
+
+		mask = LP5562_ENG_FOR_W_M;
+		switch (idx) {
+		case LP55XX_ENGINE_1:
+			val = LP5562_ENG1_FOR_W;
+			break;
+		case LP55XX_ENGINE_2:
+			val = LP5562_ENG2_FOR_W;
+			break;
+		case LP55XX_ENGINE_3:
+			val = LP5562_ENG3_FOR_W;
+			break;
+		default:
+			return -EINVAL;
+		}
+
+	} else {
+		dev_err(dev, "choose RGB or W\n");
+		return -EINVAL;
+	}
+
+	mutex_lock(&chip->lock);
+	lp55xx_update_bits(chip, LP5562_REG_ENG_SEL, mask, val);
+	mutex_unlock(&chip->lock);
+
+	return len;
+}
+
+static LP55XX_DEV_ATTR_WO(led_pattern, lp5562_store_pattern);
+static LP55XX_DEV_ATTR_WO(engine_mux, lp5562_store_engine_mux);
+
+static struct attribute *lp5562_attributes[] = {
+	&dev_attr_led_pattern.attr,
+	&dev_attr_engine_mux.attr,
+	NULL,
+};
+
+static const struct attribute_group lp5562_group = {
+	.attrs = lp5562_attributes,
+};
+
+/* Chip specific configurations */
+static struct lp55xx_device_config lp5562_cfg = {
+	.max_channel  = LP5562_MAX_LEDS,
+	.reset = {
+		.addr = LP5562_REG_RESET,
+		.val  = LP5562_RESET,
+	},
+	.enable = {
+		.addr = LP5562_REG_ENABLE,
+		.val  = LP5562_ENABLE_DEFAULT,
+	},
+	.post_init_device   = lp5562_post_init_device,
+	.set_led_current    = lp5562_set_led_current,
+	.brightness_work_fn = lp5562_led_brightness_work,
+	.run_engine         = lp5562_run_engine,
+	.firmware_cb        = lp5562_firmware_loaded,
+	.dev_attr_group     = &lp5562_group,
+};
+
+static int lp5562_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int ret;
+	struct lp55xx_chip *chip;
+	struct lp55xx_led *led;
+	struct lp55xx_platform_data *pdata;
+	struct device_node *np = client->dev.of_node;
+
+	if (!dev_get_platdata(&client->dev)) {
+		if (np) {
+			ret = lp55xx_of_populate_pdata(&client->dev, np);
+			if (ret < 0)
+				return ret;
+		} else {
+			dev_err(&client->dev, "no platform data\n");
+			return -EINVAL;
+		}
+	}
+	pdata = dev_get_platdata(&client->dev);
+
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	led = devm_kzalloc(&client->dev,
+			sizeof(*led) * pdata->num_channels, GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	chip->cl = client;
+	chip->pdata = pdata;
+	chip->cfg = &lp5562_cfg;
+
+	mutex_init(&chip->lock);
+
+	i2c_set_clientdata(client, led);
+
+	ret = lp55xx_init_device(chip);
+	if (ret)
+		goto err_init;
+
+	ret = lp55xx_register_leds(led, chip);
+	if (ret)
+		goto err_register_leds;
+
+	ret = lp55xx_register_sysfs(chip);
+	if (ret) {
+		dev_err(&client->dev, "registering sysfs failed\n");
+		goto err_register_sysfs;
+	}
+
+	return 0;
+
+err_register_sysfs:
+	lp55xx_unregister_leds(led, chip);
+err_register_leds:
+	lp55xx_deinit_device(chip);
+err_init:
+	return ret;
+}
+
+static int lp5562_remove(struct i2c_client *client)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(client);
+	struct lp55xx_chip *chip = led->chip;
+
+	lp5562_stop_engine(chip);
+
+	lp55xx_unregister_sysfs(chip);
+	lp55xx_unregister_leds(led, chip);
+	lp55xx_deinit_device(chip);
+
+	return 0;
+}
+
+static const struct i2c_device_id lp5562_id[] = {
+	{ "lp5562", 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lp5562_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_lp5562_leds_match[] = {
+	{ .compatible = "ti,lp5562", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, of_lp5562_leds_match);
+#endif
+
+static struct i2c_driver lp5562_driver = {
+	.driver = {
+		.name	= "lp5562",
+		.of_match_table = of_match_ptr(of_lp5562_leds_match),
+	},
+	.probe		= lp5562_probe,
+	.remove		= lp5562_remove,
+	.id_table	= lp5562_id,
+};
+
+module_i2c_driver(lp5562_driver);
+
+MODULE_DESCRIPTION("Texas Instruments LP5562 LED Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");

drivers/leds/leds-lp55xx-common.c

@@ -0,0 +1,599 @@
+/*
+ * LP5521/LP5523/LP55231/LP5562 Common Driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Derived from leds-lp5521.c, leds-lp5523.c
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_data/leds-lp55xx.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+
+#include "leds-lp55xx-common.h"
+
+/* External clock rate */
+#define LP55XX_CLK_32K			32768
+
+static struct lp55xx_led *cdev_to_lp55xx_led(struct led_classdev *cdev)
+{
+	return container_of(cdev, struct lp55xx_led, cdev);
+}
+
+static struct lp55xx_led *dev_to_lp55xx_led(struct device *dev)
+{
+	return cdev_to_lp55xx_led(dev_get_drvdata(dev));
+}
+
+static void lp55xx_reset_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_device_config *cfg = chip->cfg;
+	u8 addr = cfg->reset.addr;
+	u8 val  = cfg->reset.val;
+
+	/* no error checking here because no ACK from the device after reset */
+	lp55xx_write(chip, addr, val);
+}
+
+static int lp55xx_detect_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_device_config *cfg = chip->cfg;
+	u8 addr = cfg->enable.addr;
+	u8 val  = cfg->enable.val;
+	int ret;
+
+	ret = lp55xx_write(chip, addr, val);
+	if (ret)
+		return ret;
+
+	usleep_range(1000, 2000);
+
+	ret = lp55xx_read(chip, addr, &val);
+	if (ret)
+		return ret;
+
+	if (val != cfg->enable.val)
+		return -ENODEV;
+
+	return 0;
+}
+
+static int lp55xx_post_init_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_device_config *cfg = chip->cfg;
+
+	if (!cfg->post_init_device)
+		return 0;
+
+	return cfg->post_init_device(chip);
+}
+
+static ssize_t lp55xx_show_current(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", led->led_current);
+}
+
+static ssize_t lp55xx_store_current(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len)
+{
+	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
+	struct lp55xx_chip *chip = led->chip;
+	unsigned long curr;
+
+	if (kstrtoul(buf, 0, &curr))
+		return -EINVAL;
+
+	if (curr > led->max_current)
+		return -EINVAL;
+
+	if (!chip->cfg->set_led_current)
+		return len;
+
+	mutex_lock(&chip->lock);
+	chip->cfg->set_led_current(led, (u8)curr);
+	mutex_unlock(&chip->lock);
+
+	return len;
+}
+
+static ssize_t lp55xx_show_max_current(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	struct lp55xx_led *led = dev_to_lp55xx_led(dev);
+
+	return scnprintf(buf, PAGE_SIZE, "%d\n", led->max_current);
+}
+
+static DEVICE_ATTR(led_current, S_IRUGO | S_IWUSR, lp55xx_show_current,
+		lp55xx_store_current);
+static DEVICE_ATTR(max_current, S_IRUGO , lp55xx_show_max_current, NULL);
+
+static struct attribute *lp55xx_led_attrs[] = {
+	&dev_attr_led_current.attr,
+	&dev_attr_max_current.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(lp55xx_led);
+
+static void lp55xx_set_brightness(struct led_classdev *cdev,
+			     enum led_brightness brightness)
+{
+	struct lp55xx_led *led = cdev_to_lp55xx_led(cdev);
+
+	led->brightness = (u8)brightness;
+	schedule_work(&led->brightness_work);
+}
+
+static int lp55xx_init_led(struct lp55xx_led *led,
+			struct lp55xx_chip *chip, int chan)
+{
+	struct lp55xx_platform_data *pdata = chip->pdata;
+	struct lp55xx_device_config *cfg = chip->cfg;
+	struct device *dev = &chip->cl->dev;
+	char name[32];
+	int ret;
+	int max_channel = cfg->max_channel;
+
+	if (chan >= max_channel) {
+		dev_err(dev, "invalid channel: %d / %d\n", chan, max_channel);
+		return -EINVAL;
+	}
+
+	if (pdata->led_config[chan].led_current == 0)
+		return 0;
+
+	led->led_current = pdata->led_config[chan].led_current;
+	led->max_current = pdata->led_config[chan].max_current;
+	led->chan_nr = pdata->led_config[chan].chan_nr;
+	led->cdev.default_trigger = pdata->led_config[chan].default_trigger;
+
+	if (led->chan_nr >= max_channel) {
+		dev_err(dev, "Use channel numbers between 0 and %d\n",
+			max_channel - 1);
+		return -EINVAL;
+	}
+
+	led->cdev.brightness_set = lp55xx_set_brightness;
+	led->cdev.groups = lp55xx_led_groups;
+
+	if (pdata->led_config[chan].name) {
+		led->cdev.name = pdata->led_config[chan].name;
+	} else {
+		snprintf(name, sizeof(name), "%s:channel%d",
+			pdata->label ? : chip->cl->name, chan);
+		led->cdev.name = name;
+	}
+
+	ret = led_classdev_register(dev, &led->cdev);
+	if (ret) {
+		dev_err(dev, "led register err: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static void lp55xx_firmware_loaded(const struct firmware *fw, void *context)
+{
+	struct lp55xx_chip *chip = context;
+	struct device *dev = &chip->cl->dev;
+	enum lp55xx_engine_index idx = chip->engine_idx;
+
+	if (!fw) {
+		dev_err(dev, "firmware request failed\n");
+		goto out;
+	}
+
+	/* handling firmware data is chip dependent */
+	mutex_lock(&chip->lock);
+
+	chip->engines[idx - 1].mode = LP55XX_ENGINE_LOAD;
+	chip->fw = fw;
+	if (chip->cfg->firmware_cb)
+		chip->cfg->firmware_cb(chip);
+
+	mutex_unlock(&chip->lock);
+
+out:
+	/* firmware should be released for other channel use */
+	release_firmware(chip->fw);
+}
+
+static int lp55xx_request_firmware(struct lp55xx_chip *chip)
+{
+	const char *name = chip->cl->name;
+	struct device *dev = &chip->cl->dev;
+
+	return request_firmware_nowait(THIS_MODULE, true, name, dev,
+				GFP_KERNEL, chip, lp55xx_firmware_loaded);
+}
+
+static ssize_t lp55xx_show_engine_select(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+
+	return sprintf(buf, "%d\n", chip->engine_idx);
+}
+
+static ssize_t lp55xx_store_engine_select(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	unsigned long val;
+	int ret;
+
+	if (kstrtoul(buf, 0, &val))
+		return -EINVAL;
+
+	/* select the engine to be run */
+
+	switch (val) {
+	case LP55XX_ENGINE_1:
+	case LP55XX_ENGINE_2:
+	case LP55XX_ENGINE_3:
+		mutex_lock(&chip->lock);
+		chip->engine_idx = val;
+		ret = lp55xx_request_firmware(chip);
+		mutex_unlock(&chip->lock);
+		break;
+	default:
+		dev_err(dev, "%lu: invalid engine index. (1, 2, 3)\n", val);
+		return -EINVAL;
+	}
+
+	if (ret) {
+		dev_err(dev, "request firmware err: %d\n", ret);
+		return ret;
+	}
+
+	return len;
+}
+
+static inline void lp55xx_run_engine(struct lp55xx_chip *chip, bool start)
+{
+	if (chip->cfg->run_engine)
+		chip->cfg->run_engine(chip, start);
+}
+
+static ssize_t lp55xx_store_engine_run(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t len)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(to_i2c_client(dev));
+	struct lp55xx_chip *chip = led->chip;
+	unsigned long val;
+
+	if (kstrtoul(buf, 0, &val))
+		return -EINVAL;
+
+	/* run or stop the selected engine */
+
+	if (val <= 0) {
+		lp55xx_run_engine(chip, false);
+		return len;
+	}
+
+	mutex_lock(&chip->lock);
+	lp55xx_run_engine(chip, true);
+	mutex_unlock(&chip->lock);
+
+	return len;
+}
+
+static DEVICE_ATTR(select_engine, S_IRUGO | S_IWUSR,
+		   lp55xx_show_engine_select, lp55xx_store_engine_select);
+static DEVICE_ATTR(run_engine, S_IWUSR, NULL, lp55xx_store_engine_run);
+
+static struct attribute *lp55xx_engine_attributes[] = {
+	&dev_attr_select_engine.attr,
+	&dev_attr_run_engine.attr,
+	NULL,
+};
+
+static const struct attribute_group lp55xx_engine_attr_group = {
+	.attrs = lp55xx_engine_attributes,
+};
+
+int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val)
+{
+	return i2c_smbus_write_byte_data(chip->cl, reg, val);
+}
+EXPORT_SYMBOL_GPL(lp55xx_write);
+
+int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val)
+{
+	s32 ret;
+
+	ret = i2c_smbus_read_byte_data(chip->cl, reg);
+	if (ret < 0)
+		return ret;
+
+	*val = ret;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(lp55xx_read);
+
+int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg, u8 mask, u8 val)
+{
+	int ret;
+	u8 tmp;
+
+	ret = lp55xx_read(chip, reg, &tmp);
+	if (ret)
+		return ret;
+
+	tmp &= ~mask;
+	tmp |= val & mask;
+
+	return lp55xx_write(chip, reg, tmp);
+}
+EXPORT_SYMBOL_GPL(lp55xx_update_bits);
+
+bool lp55xx_is_extclk_used(struct lp55xx_chip *chip)
+{
+	struct clk *clk;
+	int err;
+
+	clk = devm_clk_get(&chip->cl->dev, "32k_clk");
+	if (IS_ERR(clk))
+		goto use_internal_clk;
+
+	err = clk_prepare_enable(clk);
+	if (err)
+		goto use_internal_clk;
+
+	if (clk_get_rate(clk) != LP55XX_CLK_32K) {
+		clk_disable_unprepare(clk);
+		goto use_internal_clk;
+	}
+
+	dev_info(&chip->cl->dev, "%dHz external clock used\n",	LP55XX_CLK_32K);
+
+	chip->clk = clk;
+	return true;
+
+use_internal_clk:
+	dev_info(&chip->cl->dev, "internal clock used\n");
+	return false;
+}
+EXPORT_SYMBOL_GPL(lp55xx_is_extclk_used);
+
+int lp55xx_init_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_platform_data *pdata;
+	struct lp55xx_device_config *cfg;
+	struct device *dev = &chip->cl->dev;
+	int ret = 0;
+
+	WARN_ON(!chip);
+
+	pdata = chip->pdata;
+	cfg = chip->cfg;
+
+	if (!pdata || !cfg)
+		return -EINVAL;
+
+	if (gpio_is_valid(pdata->enable_gpio)) {
+		ret = devm_gpio_request_one(dev, pdata->enable_gpio,
+					    GPIOF_DIR_OUT, "lp5523_enable");
+		if (ret < 0) {
+			dev_err(dev, "could not acquire enable gpio (err=%d)\n",
+				ret);
+			goto err;
+		}
+
+		gpio_set_value(pdata->enable_gpio, 0);
+		usleep_range(1000, 2000); /* Keep enable down at least 1ms */
+		gpio_set_value(pdata->enable_gpio, 1);
+		usleep_range(1000, 2000); /* 500us abs min. */
+	}
+
+	lp55xx_reset_device(chip);
+
+	/*
+	 * Exact value is not available. 10 - 20ms
+	 * appears to be enough for reset.
+	 */
+	usleep_range(10000, 20000);
+
+	ret = lp55xx_detect_device(chip);
+	if (ret) {
+		dev_err(dev, "device detection err: %d\n", ret);
+		goto err;
+	}
+
+	/* chip specific initialization */
+	ret = lp55xx_post_init_device(chip);
+	if (ret) {
+		dev_err(dev, "post init device err: %d\n", ret);
+		goto err_post_init;
+	}
+
+	return 0;
+
+err_post_init:
+	lp55xx_deinit_device(chip);
+err:
+	return ret;
+}
+EXPORT_SYMBOL_GPL(lp55xx_init_device);
+
+void lp55xx_deinit_device(struct lp55xx_chip *chip)
+{
+	struct lp55xx_platform_data *pdata = chip->pdata;
+
+	if (chip->clk)
+		clk_disable_unprepare(chip->clk);
+
+	if (gpio_is_valid(pdata->enable_gpio))
+		gpio_set_value(pdata->enable_gpio, 0);
+}
+EXPORT_SYMBOL_GPL(lp55xx_deinit_device);
+
+int lp55xx_register_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
+{
+	struct lp55xx_platform_data *pdata = chip->pdata;
+	struct lp55xx_device_config *cfg = chip->cfg;
+	int num_channels = pdata->num_channels;
+	struct lp55xx_led *each;
+	u8 led_current;
+	int ret;
+	int i;
+
+	if (!cfg->brightness_work_fn) {
+		dev_err(&chip->cl->dev, "empty brightness configuration\n");
+		return -EINVAL;
+	}
+
+	for (i = 0; i < num_channels; i++) {
+
+		/* do not initialize channels that are not connected */
+		if (pdata->led_config[i].led_current == 0)
+			continue;
+
+		led_current = pdata->led_config[i].led_current;
+		each = led + i;
+		ret = lp55xx_init_led(each, chip, i);
+		if (ret)
+			goto err_init_led;
+
+		INIT_WORK(&each->brightness_work, cfg->brightness_work_fn);
+
+		chip->num_leds++;
+		each->chip = chip;
+
+		/* setting led current at each channel */
+		if (cfg->set_led_current)
+			cfg->set_led_current(each, led_current);
+	}
+
+	return 0;
+
+err_init_led:
+	lp55xx_unregister_leds(led, chip);
+	return ret;
+}
+EXPORT_SYMBOL_GPL(lp55xx_register_leds);
+
+void lp55xx_unregister_leds(struct lp55xx_led *led, struct lp55xx_chip *chip)
+{
+	int i;
+	struct lp55xx_led *each;
+
+	for (i = 0; i < chip->num_leds; i++) {
+		each = led + i;
+		led_classdev_unregister(&each->cdev);
+		flush_work(&each->brightness_work);
+	}
+}
+EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
+
+int lp55xx_register_sysfs(struct lp55xx_chip *chip)
+{
+	struct device *dev = &chip->cl->dev;
+	struct lp55xx_device_config *cfg = chip->cfg;
+	int ret;
+
+	if (!cfg->run_engine || !cfg->firmware_cb)
+		goto dev_specific_attrs;
+
+	ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
+	if (ret)
+		return ret;
+
+dev_specific_attrs:
+	return cfg->dev_attr_group ?
+		sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
+}
+EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
+
+void lp55xx_unregister_sysfs(struct lp55xx_chip *chip)
+{
+	struct device *dev = &chip->cl->dev;
+	struct lp55xx_device_config *cfg = chip->cfg;
+
+	if (cfg->dev_attr_group)
+		sysfs_remove_group(&dev->kobj, cfg->dev_attr_group);
+
+	sysfs_remove_group(&dev->kobj, &lp55xx_engine_attr_group);
+}
+EXPORT_SYMBOL_GPL(lp55xx_unregister_sysfs);
+
+int lp55xx_of_populate_pdata(struct device *dev, struct device_node *np)
+{
+	struct device_node *child;
+	struct lp55xx_platform_data *pdata;
+	struct lp55xx_led_config *cfg;
+	int num_channels;
+	int i = 0;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return -ENOMEM;
+
+	num_channels = of_get_child_count(np);
+	if (num_channels == 0) {
+		dev_err(dev, "no LED channels\n");
+		return -EINVAL;
+	}
+
+	cfg = devm_kzalloc(dev, sizeof(*cfg) * num_channels, GFP_KERNEL);
+	if (!cfg)
+		return -ENOMEM;
+
+	pdata->led_config = &cfg[0];
+	pdata->num_channels = num_channels;
+
+	for_each_child_of_node(np, child) {
+		cfg[i].chan_nr = i;
+
+		of_property_read_string(child, "chan-name", &cfg[i].name);
+		of_property_read_u8(child, "led-cur", &cfg[i].led_current);
+		of_property_read_u8(child, "max-cur", &cfg[i].max_current);
+		cfg[i].default_trigger =
+			of_get_property(child, "linux,default-trigger", NULL);
+
+		i++;
+	}
+
+	of_property_read_string(np, "label", &pdata->label);
+	of_property_read_u8(np, "clock-mode", &pdata->clock_mode);
+
+	pdata->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0);
+
+	/* LP8501 specific */
+	of_property_read_u8(np, "pwr-sel", (u8 *)&pdata->pwr_sel);
+
+	dev->platform_data = pdata;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(lp55xx_of_populate_pdata);
+
+MODULE_AUTHOR("Milo Kim <milo.kim@ti.com>");
+MODULE_DESCRIPTION("LP55xx Common Driver");
+MODULE_LICENSE("GPL");

drivers/leds/leds-lp55xx-common.h

@@ -0,0 +1,208 @@
+/*
+ * LP55XX Common Driver Header
+ *
+ * Copyright (C) 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * Derived from leds-lp5521.c, leds-lp5523.c
+ */
+
+#ifndef _LEDS_LP55XX_COMMON_H
+#define _LEDS_LP55XX_COMMON_H
+
+enum lp55xx_engine_index {
+	LP55XX_ENGINE_INVALID,
+	LP55XX_ENGINE_1,
+	LP55XX_ENGINE_2,
+	LP55XX_ENGINE_3,
+	LP55XX_ENGINE_MAX = LP55XX_ENGINE_3,
+};
+
+enum lp55xx_engine_mode {
+	LP55XX_ENGINE_DISABLED,
+	LP55XX_ENGINE_LOAD,
+	LP55XX_ENGINE_RUN,
+};
+
+#define LP55XX_DEV_ATTR_RW(name, show, store)	\
+	DEVICE_ATTR(name, S_IRUGO | S_IWUSR, show, store)
+#define LP55XX_DEV_ATTR_RO(name, show)		\
+	DEVICE_ATTR(name, S_IRUGO, show, NULL)
+#define LP55XX_DEV_ATTR_WO(name, store)		\
+	DEVICE_ATTR(name, S_IWUSR, NULL, store)
+
+#define show_mode(nr)							\
+static ssize_t show_engine##nr##_mode(struct device *dev,		\
+				    struct device_attribute *attr,	\
+				    char *buf)				\
+{									\
+	return show_engine_mode(dev, attr, buf, nr);			\
+}
+
+#define store_mode(nr)							\
+static ssize_t store_engine##nr##_mode(struct device *dev,		\
+				     struct device_attribute *attr,	\
+				     const char *buf, size_t len)	\
+{									\
+	return store_engine_mode(dev, attr, buf, len, nr);		\
+}
+
+#define show_leds(nr)							\
+static ssize_t show_engine##nr##_leds(struct device *dev,		\
+			    struct device_attribute *attr,		\
+			    char *buf)					\
+{									\
+	return show_engine_leds(dev, attr, buf, nr);			\
+}
+
+#define store_leds(nr)						\
+static ssize_t store_engine##nr##_leds(struct device *dev,	\
+			     struct device_attribute *attr,	\
+			     const char *buf, size_t len)	\
+{								\
+	return store_engine_leds(dev, attr, buf, len, nr);	\
+}
+
+#define store_load(nr)							\
+static ssize_t store_engine##nr##_load(struct device *dev,		\
+				     struct device_attribute *attr,	\
+				     const char *buf, size_t len)	\
+{									\
+	return store_engine_load(dev, attr, buf, len, nr);		\
+}
+
+struct lp55xx_led;
+struct lp55xx_chip;
+
+/*
+ * struct lp55xx_reg
+ * @addr : Register address
+ * @val  : Register value
+ */
+struct lp55xx_reg {
+	u8 addr;
+	u8 val;
+};
+
+/*
+ * struct lp55xx_device_config
+ * @reset              : Chip specific reset command
+ * @enable             : Chip specific enable command
+ * @max_channel        : Maximum number of channels
+ * @post_init_device   : Chip specific initialization code
+ * @brightness_work_fn : Brightness work function
+ * @set_led_current    : LED current set function
+ * @firmware_cb        : Call function when the firmware is loaded
+ * @run_engine         : Run internal engine for pattern
+ * @dev_attr_group     : Device specific attributes
+ */
+struct lp55xx_device_config {
+	const struct lp55xx_reg reset;
+	const struct lp55xx_reg enable;
+	const int max_channel;
+
+	/* define if the device has specific initialization process */
+	int (*post_init_device) (struct lp55xx_chip *chip);
+
+	/* access brightness register */
+	void (*brightness_work_fn)(struct work_struct *work);
+
+	/* current setting function */
+	void (*set_led_current) (struct lp55xx_led *led, u8 led_current);
+
+	/* access program memory when the firmware is loaded */
+	void (*firmware_cb)(struct lp55xx_chip *chip);
+
+	/* used for running firmware LED patterns */
+	void (*run_engine) (struct lp55xx_chip *chip, bool start);
+
+	/* additional device specific attributes */
+	const struct attribute_group *dev_attr_group;
+};
+
+/*
+ * struct lp55xx_engine
+ * @mode       : Engine mode
+ * @led_mux    : Mux bits for LED selection. Only used in LP5523
+ */
+struct lp55xx_engine {
+	enum lp55xx_engine_mode mode;
+	u16 led_mux;
+};
+
+/*
+ * struct lp55xx_chip
+ * @cl         : I2C communication for access registers
+ * @pdata      : Platform specific data
+ * @lock       : Lock for user-space interface
+ * @num_leds   : Number of registered LEDs
+ * @cfg        : Device specific configuration data
+ * @engine_idx : Selected engine number
+ * @engines    : Engine structure for the device attribute R/W interface
+ * @fw         : Firmware data for running a LED pattern
+ */
+struct lp55xx_chip {
+	struct i2c_client *cl;
+	struct clk *clk;
+	struct lp55xx_platform_data *pdata;
+	struct mutex lock;	/* lock for user-space interface */
+	int num_leds;
+	struct lp55xx_device_config *cfg;
+	enum lp55xx_engine_index engine_idx;
+	struct lp55xx_engine engines[LP55XX_ENGINE_MAX];
+	const struct firmware *fw;
+};
+
+/*
+ * struct lp55xx_led
+ * @chan_nr         : Channel number
+ * @cdev            : LED class device
+ * @led_current     : Current setting at each led channel
+ * @max_current     : Maximun current at each led channel
+ * @brightness_work : Workqueue for brightness control
+ * @brightness      : Brightness value
+ * @chip            : The lp55xx chip data
+ */
+struct lp55xx_led {
+	int chan_nr;
+	struct led_classdev cdev;
+	u8 led_current;
+	u8 max_current;
+	struct work_struct brightness_work;
+	u8 brightness;
+	struct lp55xx_chip *chip;
+};
+
+/* register access */
+extern int lp55xx_write(struct lp55xx_chip *chip, u8 reg, u8 val);
+extern int lp55xx_read(struct lp55xx_chip *chip, u8 reg, u8 *val);
+extern int lp55xx_update_bits(struct lp55xx_chip *chip, u8 reg,
+			u8 mask, u8 val);
+
+/* external clock detection */
+extern bool lp55xx_is_extclk_used(struct lp55xx_chip *chip);
+
+/* common device init/deinit functions */
+extern int lp55xx_init_device(struct lp55xx_chip *chip);
+extern void lp55xx_deinit_device(struct lp55xx_chip *chip);
+
+/* common LED class device functions */
+extern int lp55xx_register_leds(struct lp55xx_led *led,
+				struct lp55xx_chip *chip);
+extern void lp55xx_unregister_leds(struct lp55xx_led *led,
+				struct lp55xx_chip *chip);
+
+/* common device attributes functions */
+extern int lp55xx_register_sysfs(struct lp55xx_chip *chip);
+extern void lp55xx_unregister_sysfs(struct lp55xx_chip *chip);
+
+/* common device tree population function */
+extern int lp55xx_of_populate_pdata(struct device *dev,
+				    struct device_node *np);
+
+#endif /* _LEDS_LP55XX_COMMON_H */

drivers/leds/leds-lp8501.c

@@ -0,0 +1,411 @@
+/*
+ * TI LP8501 9 channel LED Driver
+ *
+ * Copyright (C) 2013 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/platform_data/leds-lp55xx.h>
+#include <linux/slab.h>
+
+#include "leds-lp55xx-common.h"
+
+#define LP8501_PROGRAM_LENGTH		32
+#define LP8501_MAX_LEDS			9
+
+/* Registers */
+#define LP8501_REG_ENABLE		0x00
+#define LP8501_ENABLE			BIT(6)
+#define LP8501_EXEC_M			0x3F
+#define LP8501_EXEC_ENG1_M		0x30
+#define LP8501_EXEC_ENG2_M		0x0C
+#define LP8501_EXEC_ENG3_M		0x03
+#define LP8501_RUN_ENG1			0x20
+#define LP8501_RUN_ENG2			0x08
+#define LP8501_RUN_ENG3			0x02
+
+#define LP8501_REG_OP_MODE		0x01
+#define LP8501_MODE_ENG1_M		0x30
+#define LP8501_MODE_ENG2_M		0x0C
+#define LP8501_MODE_ENG3_M		0x03
+#define LP8501_LOAD_ENG1		0x10
+#define LP8501_LOAD_ENG2		0x04
+#define LP8501_LOAD_ENG3		0x01
+
+#define LP8501_REG_PWR_CONFIG		0x05
+#define LP8501_PWR_CONFIG_M		0x03
+
+#define LP8501_REG_LED_PWM_BASE		0x16
+
+#define LP8501_REG_LED_CURRENT_BASE	0x26
+
+#define LP8501_REG_CONFIG		0x36
+#define LP8501_PWM_PSAVE		BIT(7)
+#define LP8501_AUTO_INC			BIT(6)
+#define LP8501_PWR_SAVE			BIT(5)
+#define LP8501_CP_AUTO			0x18
+#define LP8501_INT_CLK			BIT(0)
+#define LP8501_DEFAULT_CFG	\
+	(LP8501_PWM_PSAVE | LP8501_AUTO_INC | LP8501_PWR_SAVE | LP8501_CP_AUTO)
+
+#define LP8501_REG_RESET		0x3D
+#define LP8501_RESET			0xFF
+
+#define LP8501_REG_PROG_PAGE_SEL	0x4F
+#define LP8501_PAGE_ENG1		0
+#define LP8501_PAGE_ENG2		1
+#define LP8501_PAGE_ENG3		2
+
+#define LP8501_REG_PROG_MEM		0x50
+
+#define LP8501_ENG1_IS_LOADING(mode)	\
+	((mode & LP8501_MODE_ENG1_M) == LP8501_LOAD_ENG1)
+#define LP8501_ENG2_IS_LOADING(mode)	\
+	((mode & LP8501_MODE_ENG2_M) == LP8501_LOAD_ENG2)
+#define LP8501_ENG3_IS_LOADING(mode)	\
+	((mode & LP8501_MODE_ENG3_M) == LP8501_LOAD_ENG3)
+
+static inline void lp8501_wait_opmode_done(void)
+{
+	usleep_range(1000, 2000);
+}
+
+static void lp8501_set_led_current(struct lp55xx_led *led, u8 led_current)
+{
+	led->led_current = led_current;
+	lp55xx_write(led->chip, LP8501_REG_LED_CURRENT_BASE + led->chan_nr,
+		led_current);
+}
+
+static int lp8501_post_init_device(struct lp55xx_chip *chip)
+{
+	int ret;
+	u8 val = LP8501_DEFAULT_CFG;
+
+	ret = lp55xx_write(chip, LP8501_REG_ENABLE, LP8501_ENABLE);
+	if (ret)
+		return ret;
+
+	/* Chip startup time is 500 us, 1 - 2 ms gives some margin */
+	usleep_range(1000, 2000);
+
+	if (chip->pdata->clock_mode != LP55XX_CLOCK_EXT)
+		val |= LP8501_INT_CLK;
+
+	ret = lp55xx_write(chip, LP8501_REG_CONFIG, val);
+	if (ret)
+		return ret;
+
+	/* Power selection for each output */
+	return lp55xx_update_bits(chip, LP8501_REG_PWR_CONFIG,
+				LP8501_PWR_CONFIG_M, chip->pdata->pwr_sel);
+}
+
+static void lp8501_load_engine(struct lp55xx_chip *chip)
+{
+	enum lp55xx_engine_index idx = chip->engine_idx;
+	u8 mask[] = {
+		[LP55XX_ENGINE_1] = LP8501_MODE_ENG1_M,
+		[LP55XX_ENGINE_2] = LP8501_MODE_ENG2_M,
+		[LP55XX_ENGINE_3] = LP8501_MODE_ENG3_M,
+	};
+
+	u8 val[] = {
+		[LP55XX_ENGINE_1] = LP8501_LOAD_ENG1,
+		[LP55XX_ENGINE_2] = LP8501_LOAD_ENG2,
+		[LP55XX_ENGINE_3] = LP8501_LOAD_ENG3,
+	};
+
+	u8 page_sel[] = {
+		[LP55XX_ENGINE_1] = LP8501_PAGE_ENG1,
+		[LP55XX_ENGINE_2] = LP8501_PAGE_ENG2,
+		[LP55XX_ENGINE_3] = LP8501_PAGE_ENG3,
+	};
+
+	lp55xx_update_bits(chip, LP8501_REG_OP_MODE, mask[idx], val[idx]);
+
+	lp8501_wait_opmode_done();
+
+	lp55xx_write(chip, LP8501_REG_PROG_PAGE_SEL, page_sel[idx]);
+}
+
+static void lp8501_stop_engine(struct lp55xx_chip *chip)
+{
+	lp55xx_write(chip, LP8501_REG_OP_MODE, 0);
+	lp8501_wait_opmode_done();
+}
+
+static void lp8501_turn_off_channels(struct lp55xx_chip *chip)
+{
+	int i;
+
+	for (i = 0; i < LP8501_MAX_LEDS; i++)
+		lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + i, 0);
+}
+
+static void lp8501_run_engine(struct lp55xx_chip *chip, bool start)
+{
+	int ret;
+	u8 mode;
+	u8 exec;
+
+	/* stop engine */
+	if (!start) {
+		lp8501_stop_engine(chip);
+		lp8501_turn_off_channels(chip);
+		return;
+	}
+
+	/*
+	 * To run the engine,
+	 * operation mode and enable register should updated at the same time
+	 */
+
+	ret = lp55xx_read(chip, LP8501_REG_OP_MODE, &mode);
+	if (ret)
+		return;
+
+	ret = lp55xx_read(chip, LP8501_REG_ENABLE, &exec);
+	if (ret)
+		return;
+
+	/* change operation mode to RUN only when each engine is loading */
+	if (LP8501_ENG1_IS_LOADING(mode)) {
+		mode = (mode & ~LP8501_MODE_ENG1_M) | LP8501_RUN_ENG1;
+		exec = (exec & ~LP8501_EXEC_ENG1_M) | LP8501_RUN_ENG1;
+	}
+
+	if (LP8501_ENG2_IS_LOADING(mode)) {
+		mode = (mode & ~LP8501_MODE_ENG2_M) | LP8501_RUN_ENG2;
+		exec = (exec & ~LP8501_EXEC_ENG2_M) | LP8501_RUN_ENG2;
+	}
+
+	if (LP8501_ENG3_IS_LOADING(mode)) {
+		mode = (mode & ~LP8501_MODE_ENG3_M) | LP8501_RUN_ENG3;
+		exec = (exec & ~LP8501_EXEC_ENG3_M) | LP8501_RUN_ENG3;
+	}
+
+	lp55xx_write(chip, LP8501_REG_OP_MODE, mode);
+	lp8501_wait_opmode_done();
+
+	lp55xx_update_bits(chip, LP8501_REG_ENABLE, LP8501_EXEC_M, exec);
+}
+
+static int lp8501_update_program_memory(struct lp55xx_chip *chip,
+					const u8 *data, size_t size)
+{
+	u8 pattern[LP8501_PROGRAM_LENGTH] = {0};
+	unsigned cmd;
+	char c[3];
+	int update_size;
+	int nrchars;
+	int offset = 0;
+	int ret;
+	int i;
+
+	/* clear program memory before updating */
+	for (i = 0; i < LP8501_PROGRAM_LENGTH; i++)
+		lp55xx_write(chip, LP8501_REG_PROG_MEM + i, 0);
+
+	i = 0;
+	while ((offset < size - 1) && (i < LP8501_PROGRAM_LENGTH)) {
+		/* separate sscanfs because length is working only for %s */
+		ret = sscanf(data + offset, "%2s%n ", c, &nrchars);
+		if (ret != 1)
+			goto err;
+
+		ret = sscanf(c, "%2x", &cmd);
+		if (ret != 1)
+			goto err;
+
+		pattern[i] = (u8)cmd;
+		offset += nrchars;
+		i++;
+	}
+
+	/* Each instruction is 16bit long. Check that length is even */
+	if (i % 2)
+		goto err;
+
+	update_size = i;
+	for (i = 0; i < update_size; i++)
+		lp55xx_write(chip, LP8501_REG_PROG_MEM + i, pattern[i]);
+
+	return 0;
+
+err:
+	dev_err(&chip->cl->dev, "wrong pattern format\n");
+	return -EINVAL;
+}
+
+static void lp8501_firmware_loaded(struct lp55xx_chip *chip)
+{
+	const struct firmware *fw = chip->fw;
+
+	if (fw->size > LP8501_PROGRAM_LENGTH) {
+		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
+			fw->size);
+		return;
+	}
+
+	/*
+	 * Program memory sequence
+	 *  1) set engine mode to "LOAD"
+	 *  2) write firmware data into program memory
+	 */
+
+	lp8501_load_engine(chip);
+	lp8501_update_program_memory(chip, fw->data, fw->size);
+}
+
+static void lp8501_led_brightness_work(struct work_struct *work)
+{
+	struct lp55xx_led *led = container_of(work, struct lp55xx_led,
+					      brightness_work);
+	struct lp55xx_chip *chip = led->chip;
+
+	mutex_lock(&chip->lock);
+	lp55xx_write(chip, LP8501_REG_LED_PWM_BASE + led->chan_nr,
+		     led->brightness);
+	mutex_unlock(&chip->lock);
+}
+
+/* Chip specific configurations */
+static struct lp55xx_device_config lp8501_cfg = {
+	.reset = {
+		.addr = LP8501_REG_RESET,
+		.val  = LP8501_RESET,
+	},
+	.enable = {
+		.addr = LP8501_REG_ENABLE,
+		.val  = LP8501_ENABLE,
+	},
+	.max_channel  = LP8501_MAX_LEDS,
+	.post_init_device   = lp8501_post_init_device,
+	.brightness_work_fn = lp8501_led_brightness_work,
+	.set_led_current    = lp8501_set_led_current,
+	.firmware_cb        = lp8501_firmware_loaded,
+	.run_engine         = lp8501_run_engine,
+};
+
+static int lp8501_probe(struct i2c_client *client,
+			const struct i2c_device_id *id)
+{
+	int ret;
+	struct lp55xx_chip *chip;
+	struct lp55xx_led *led;
+	struct lp55xx_platform_data *pdata;
+	struct device_node *np = client->dev.of_node;
+
+	if (!dev_get_platdata(&client->dev)) {
+		if (np) {
+			ret = lp55xx_of_populate_pdata(&client->dev, np);
+			if (ret < 0)
+				return ret;
+		} else {
+			dev_err(&client->dev, "no platform data\n");
+			return -EINVAL;
+		}
+	}
+	pdata = dev_get_platdata(&client->dev);
+
+	chip = devm_kzalloc(&client->dev, sizeof(*chip), GFP_KERNEL);
+	if (!chip)
+		return -ENOMEM;
+
+	led = devm_kzalloc(&client->dev,
+			sizeof(*led) * pdata->num_channels, GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	chip->cl = client;
+	chip->pdata = pdata;
+	chip->cfg = &lp8501_cfg;
+
+	mutex_init(&chip->lock);
+
+	i2c_set_clientdata(client, led);
+
+	ret = lp55xx_init_device(chip);
+	if (ret)
+		goto err_init;
+
+	dev_info(&client->dev, "%s Programmable led chip found\n", id->name);
+
+	ret = lp55xx_register_leds(led, chip);
+	if (ret)
+		goto err_register_leds;
+
+	ret = lp55xx_register_sysfs(chip);
+	if (ret) {
+		dev_err(&client->dev, "registering sysfs failed\n");
+		goto err_register_sysfs;
+	}
+
+	return 0;
+
+err_register_sysfs:
+	lp55xx_unregister_leds(led, chip);
+err_register_leds:
+	lp55xx_deinit_device(chip);
+err_init:
+	return ret;
+}
+
+static int lp8501_remove(struct i2c_client *client)
+{
+	struct lp55xx_led *led = i2c_get_clientdata(client);
+	struct lp55xx_chip *chip = led->chip;
+
+	lp8501_stop_engine(chip);
+	lp55xx_unregister_sysfs(chip);
+	lp55xx_unregister_leds(led, chip);
+	lp55xx_deinit_device(chip);
+
+	return 0;
+}
+
+static const struct i2c_device_id lp8501_id[] = {
+	{ "lp8501",  0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, lp8501_id);
+
+#ifdef CONFIG_OF
+static const struct of_device_id of_lp8501_leds_match[] = {
+	{ .compatible = "ti,lp8501", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, of_lp8501_leds_match);
+#endif
+
+static struct i2c_driver lp8501_driver = {
+	.driver = {
+		.name	= "lp8501",
+		.of_match_table = of_match_ptr(of_lp8501_leds_match),
+	},
+	.probe		= lp8501_probe,
+	.remove		= lp8501_remove,
+	.id_table	= lp8501_id,
+};
+
+module_i2c_driver(lp8501_driver);
+
+MODULE_DESCRIPTION("Texas Instruments LP8501 LED drvier");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");

drivers/leds/leds-lp8788.c

@@ -0,0 +1,194 @@
+/*
+ * TI LP8788 MFD - keyled driver
+ *
+ * Copyright 2012 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/mutex.h>
+#include <linux/mfd/lp8788.h>
+#include <linux/mfd/lp8788-isink.h>
+
+#define MAX_BRIGHTNESS			LP8788_ISINK_MAX_PWM
+#define DEFAULT_LED_NAME		"keyboard-backlight"
+
+struct lp8788_led {
+	struct lp8788 *lp;
+	struct mutex lock;
+	struct work_struct work;
+	struct led_classdev led_dev;
+	enum lp8788_isink_number isink_num;
+	enum led_brightness brightness;
+	int on;
+};
+
+struct lp8788_led_config {
+	enum lp8788_isink_scale scale;
+	enum lp8788_isink_number num;
+	int iout;
+};
+
+static struct lp8788_led_config default_led_config = {
+	.scale = LP8788_ISINK_SCALE_100mA,
+	.num   = LP8788_ISINK_3,
+	.iout  = 0,
+};
+
+static int lp8788_led_init_device(struct lp8788_led *led,
+				struct lp8788_led_platform_data *pdata)
+{
+	struct lp8788_led_config *cfg = &default_led_config;
+	u8 addr, mask, val;
+	int ret;
+
+	if (pdata) {
+		cfg->scale = pdata->scale;
+		cfg->num = pdata->num;
+		cfg->iout = pdata->iout_code;
+	}
+
+	led->isink_num = cfg->num;
+
+	/* scale configuration */
+	addr = LP8788_ISINK_CTRL;
+	mask = 1 << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
+	val = cfg->scale << (cfg->num + LP8788_ISINK_SCALE_OFFSET);
+	ret = lp8788_update_bits(led->lp, addr, mask, val);
+	if (ret)
+		return ret;
+
+	/* current configuration */
+	addr = lp8788_iout_addr[cfg->num];
+	mask = lp8788_iout_mask[cfg->num];
+	val = cfg->iout;
+
+	return lp8788_update_bits(led->lp, addr, mask, val);
+}
+
+static void lp8788_led_enable(struct lp8788_led *led,
+			enum lp8788_isink_number num, int on)
+{
+	u8 mask = 1 << num;
+	u8 val = on << num;
+
+	if (lp8788_update_bits(led->lp, LP8788_ISINK_CTRL, mask, val))
+		return;
+
+	led->on = on;
+}
+
+static void lp8788_led_work(struct work_struct *work)
+{
+	struct lp8788_led *led = container_of(work, struct lp8788_led, work);
+	enum lp8788_isink_number num = led->isink_num;
+	int enable;
+	u8 val = led->brightness;
+
+	mutex_lock(&led->lock);
+
+	switch (num) {
+	case LP8788_ISINK_1:
+	case LP8788_ISINK_2:
+	case LP8788_ISINK_3:
+		lp8788_write_byte(led->lp, lp8788_pwm_addr[num], val);
+		break;
+	default:
+		mutex_unlock(&led->lock);
+		return;
+	}
+
+	enable = (val > 0) ? 1 : 0;
+	if (enable != led->on)
+		lp8788_led_enable(led, num, enable);
+
+	mutex_unlock(&led->lock);
+}
+
+static void lp8788_brightness_set(struct led_classdev *led_cdev,
+				enum led_brightness brt_val)
+{
+	struct lp8788_led *led =
+			container_of(led_cdev, struct lp8788_led, led_dev);
+
+	led->brightness = brt_val;
+	schedule_work(&led->work);
+}
+
+static int lp8788_led_probe(struct platform_device *pdev)
+{
+	struct lp8788 *lp = dev_get_drvdata(pdev->dev.parent);
+	struct lp8788_led_platform_data *led_pdata;
+	struct lp8788_led *led;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	led = devm_kzalloc(dev, sizeof(struct lp8788_led), GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	led->lp = lp;
+	led->led_dev.max_brightness = MAX_BRIGHTNESS;
+	led->led_dev.brightness_set = lp8788_brightness_set;
+
+	led_pdata = lp->pdata ? lp->pdata->led_pdata : NULL;
+
+	if (!led_pdata || !led_pdata->name)
+		led->led_dev.name = DEFAULT_LED_NAME;
+	else
+		led->led_dev.name = led_pdata->name;
+
+	mutex_init(&led->lock);
+	INIT_WORK(&led->work, lp8788_led_work);
+
+	platform_set_drvdata(pdev, led);
+
+	ret = lp8788_led_init_device(led, led_pdata);
+	if (ret) {
+		dev_err(dev, "led init device err: %d\n", ret);
+		return ret;
+	}
+
+	ret = led_classdev_register(dev, &led->led_dev);
+	if (ret) {
+		dev_err(dev, "led register err: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int lp8788_led_remove(struct platform_device *pdev)
+{
+	struct lp8788_led *led = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&led->led_dev);
+	flush_work(&led->work);
+
+	return 0;
+}
+
+static struct platform_driver lp8788_led_driver = {
+	.probe = lp8788_led_probe,
+	.remove = lp8788_led_remove,
+	.driver = {
+		.name = LP8788_DEV_KEYLED,
+		.owner = THIS_MODULE,
+	},
+};
+module_platform_driver(lp8788_led_driver);
+
+MODULE_DESCRIPTION("Texas Instruments LP8788 Keyboard LED Driver");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:lp8788-keyled");

drivers/leds/leds-lt3593.c

@@ -0,0 +1,196 @@
+/*
+ * LEDs driver for LT3593 controllers
+ *
+ * See the datasheet at http://cds.linear.com/docs/Datasheet/3593f.pdf
+ *
+ * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
+ *
+ * Based on leds-gpio.c,
+ *
+ *   Copyright (C) 2007 8D Technologies inc.
+ *   Raphael Assenat <raph@8d.com>
+ *   Copyright (C) 2008 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+struct lt3593_led_data {
+	struct led_classdev cdev;
+	unsigned gpio;
+	struct work_struct work;
+	u8 new_level;
+};
+
+static void lt3593_led_work(struct work_struct *work)
+{
+	int pulses;
+	struct lt3593_led_data *led_dat =
+		container_of(work, struct lt3593_led_data, work);
+
+	/*
+	 * The LT3593 resets its internal current level register to the maximum
+	 * level on the first falling edge on the control pin. Each following
+	 * falling edge decreases the current level by 625uA. Up to 32 pulses
+	 * can be sent, so the maximum power reduction is 20mA.
+	 * After a timeout of 128us, the value is taken from the register and
+	 * applied is to the output driver.
+	 */
+
+	if (led_dat->new_level == 0) {
+		gpio_set_value_cansleep(led_dat->gpio, 0);
+		return;
+	}
+
+	pulses = 32 - (led_dat->new_level * 32) / 255;
+
+	if (pulses == 0) {
+		gpio_set_value_cansleep(led_dat->gpio, 0);
+		mdelay(1);
+		gpio_set_value_cansleep(led_dat->gpio, 1);
+		return;
+	}
+
+	gpio_set_value_cansleep(led_dat->gpio, 1);
+
+	while (pulses--) {
+		gpio_set_value_cansleep(led_dat->gpio, 0);
+		udelay(1);
+		gpio_set_value_cansleep(led_dat->gpio, 1);
+		udelay(1);
+	}
+}
+
+static void lt3593_led_set(struct led_classdev *led_cdev,
+	enum led_brightness value)
+{
+	struct lt3593_led_data *led_dat =
+		container_of(led_cdev, struct lt3593_led_data, cdev);
+
+	led_dat->new_level = value;
+	schedule_work(&led_dat->work);
+}
+
+static int create_lt3593_led(const struct gpio_led *template,
+	struct lt3593_led_data *led_dat, struct device *parent)
+{
+	int ret, state;
+
+	/* skip leds on GPIOs that aren't available */
+	if (!gpio_is_valid(template->gpio)) {
+		dev_info(parent, "%s: skipping unavailable LT3593 LED at gpio %d (%s)\n",
+				KBUILD_MODNAME, template->gpio, template->name);
+		return 0;
+	}
+
+	led_dat->cdev.name = template->name;
+	led_dat->cdev.default_trigger = template->default_trigger;
+	led_dat->gpio = template->gpio;
+
+	led_dat->cdev.brightness_set = lt3593_led_set;
+
+	state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
+	led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
+
+	if (!template->retain_state_suspended)
+		led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+
+	ret = devm_gpio_request_one(parent, template->gpio, state ?
+				    GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+				    template->name);
+	if (ret < 0)
+		return ret;
+
+	INIT_WORK(&led_dat->work, lt3593_led_work);
+
+	ret = led_classdev_register(parent, &led_dat->cdev);
+	if (ret < 0)
+		return ret;
+
+	dev_info(parent, "%s: registered LT3593 LED '%s' at GPIO %d\n",
+		KBUILD_MODNAME, template->name, template->gpio);
+
+	return 0;
+}
+
+static void delete_lt3593_led(struct lt3593_led_data *led)
+{
+	if (!gpio_is_valid(led->gpio))
+		return;
+
+	led_classdev_unregister(&led->cdev);
+	cancel_work_sync(&led->work);
+}
+
+static int lt3593_led_probe(struct platform_device *pdev)
+{
+	struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct lt3593_led_data *leds_data;
+	int i, ret = 0;
+
+	if (!pdata)
+		return -EBUSY;
+
+	leds_data = devm_kzalloc(&pdev->dev,
+			sizeof(struct lt3593_led_data) * pdata->num_leds,
+			GFP_KERNEL);
+	if (!leds_data)
+		return -ENOMEM;
+
+	for (i = 0; i < pdata->num_leds; i++) {
+		ret = create_lt3593_led(&pdata->leds[i], &leds_data[i],
+				      &pdev->dev);
+		if (ret < 0)
+			goto err;
+	}
+
+	platform_set_drvdata(pdev, leds_data);
+
+	return 0;
+
+err:
+	for (i = i - 1; i >= 0; i--)
+		delete_lt3593_led(&leds_data[i]);
+
+	return ret;
+}
+
+static int lt3593_led_remove(struct platform_device *pdev)
+{
+	int i;
+	struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct lt3593_led_data *leds_data;
+
+	leds_data = platform_get_drvdata(pdev);
+
+	for (i = 0; i < pdata->num_leds; i++)
+		delete_lt3593_led(&leds_data[i]);
+
+	return 0;
+}
+
+static struct platform_driver lt3593_led_driver = {
+	.probe		= lt3593_led_probe,
+	.remove		= lt3593_led_remove,
+	.driver		= {
+		.name	= "leds-lt3593",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(lt3593_led_driver);
+
+MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
+MODULE_DESCRIPTION("LED driver for LT3593 controllers");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-lt3593");

drivers/leds/leds-max8997.c

@@ -0,0 +1,317 @@
+/*
+ * leds-max8997.c - LED class driver for MAX8997 LEDs.
+ *
+ * Copyright (C) 2011 Samsung Electronics
+ * Donggeun Kim <dg77.kim@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/leds.h>
+#include <linux/mfd/max8997.h>
+#include <linux/mfd/max8997-private.h>
+#include <linux/platform_device.h>
+
+#define MAX8997_LED_FLASH_SHIFT			3
+#define MAX8997_LED_FLASH_CUR_MASK		0xf8
+#define MAX8997_LED_MOVIE_SHIFT			4
+#define MAX8997_LED_MOVIE_CUR_MASK		0xf0
+
+#define MAX8997_LED_FLASH_MAX_BRIGHTNESS	0x1f
+#define MAX8997_LED_MOVIE_MAX_BRIGHTNESS	0xf
+#define MAX8997_LED_NONE_MAX_BRIGHTNESS		0
+
+#define MAX8997_LED0_FLASH_MASK			0x1
+#define MAX8997_LED0_FLASH_PIN_MASK		0x5
+#define MAX8997_LED0_MOVIE_MASK			0x8
+#define MAX8997_LED0_MOVIE_PIN_MASK		0x28
+
+#define MAX8997_LED1_FLASH_MASK			0x2
+#define MAX8997_LED1_FLASH_PIN_MASK		0x6
+#define MAX8997_LED1_MOVIE_MASK			0x10
+#define MAX8997_LED1_MOVIE_PIN_MASK		0x30
+
+#define MAX8997_LED_BOOST_ENABLE_MASK		(1 << 6)
+
+struct max8997_led {
+	struct max8997_dev *iodev;
+	struct led_classdev cdev;
+	bool enabled;
+	int id;
+	enum max8997_led_mode led_mode;
+	struct mutex mutex;
+};
+
+static void max8997_led_set_mode(struct max8997_led *led,
+			enum max8997_led_mode mode)
+{
+	int ret;
+	struct i2c_client *client = led->iodev->i2c;
+	u8 mask = 0, val;
+
+	switch (mode) {
+	case MAX8997_FLASH_MODE:
+		mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK;
+		val = led->id ?
+		      MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
+		led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
+		break;
+	case MAX8997_MOVIE_MODE:
+		mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK;
+		val = led->id ?
+		      MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
+		led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
+		break;
+	case MAX8997_FLASH_PIN_CONTROL_MODE:
+		mask = MAX8997_LED1_FLASH_PIN_MASK |
+		       MAX8997_LED0_FLASH_PIN_MASK;
+		val = led->id ?
+		      MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
+		led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
+		break;
+	case MAX8997_MOVIE_PIN_CONTROL_MODE:
+		mask = MAX8997_LED1_MOVIE_PIN_MASK |
+		       MAX8997_LED0_MOVIE_PIN_MASK;
+		val = led->id ?
+		      MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
+		led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
+		break;
+	default:
+		led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
+		break;
+	}
+
+	if (mask) {
+		ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
+					 mask);
+		if (ret)
+			dev_err(led->iodev->dev,
+				"failed to update register(%d)\n", ret);
+	}
+
+	led->led_mode = mode;
+}
+
+static void max8997_led_enable(struct max8997_led *led, bool enable)
+{
+	int ret;
+	struct i2c_client *client = led->iodev->i2c;
+	u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;
+
+	if (led->enabled == enable)
+		return;
+
+	val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;
+
+	ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
+	if (ret)
+		dev_err(led->iodev->dev,
+			"failed to update register(%d)\n", ret);
+
+	led->enabled = enable;
+}
+
+static void max8997_led_set_current(struct max8997_led *led,
+				enum led_brightness value)
+{
+	int ret;
+	struct i2c_client *client = led->iodev->i2c;
+	u8 val = 0, mask = 0, reg = 0;
+
+	switch (led->led_mode) {
+	case MAX8997_FLASH_MODE:
+	case MAX8997_FLASH_PIN_CONTROL_MODE:
+		val = value << MAX8997_LED_FLASH_SHIFT;
+		mask = MAX8997_LED_FLASH_CUR_MASK;
+		reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
+		break;
+	case MAX8997_MOVIE_MODE:
+	case MAX8997_MOVIE_PIN_CONTROL_MODE:
+		val = value << MAX8997_LED_MOVIE_SHIFT;
+		mask = MAX8997_LED_MOVIE_CUR_MASK;
+		reg = MAX8997_REG_MOVIE_CUR;
+		break;
+	default:
+		break;
+	}
+
+	if (mask) {
+		ret = max8997_update_reg(client, reg, val, mask);
+		if (ret)
+			dev_err(led->iodev->dev,
+				"failed to update register(%d)\n", ret);
+	}
+}
+
+static void max8997_led_brightness_set(struct led_classdev *led_cdev,
+				enum led_brightness value)
+{
+	struct max8997_led *led =
+			container_of(led_cdev, struct max8997_led, cdev);
+
+	if (value) {
+		max8997_led_set_current(led, value);
+		max8997_led_enable(led, true);
+	} else {
+		max8997_led_set_current(led, value);
+		max8997_led_enable(led, false);
+	}
+}
+
+static ssize_t max8997_led_show_mode(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct max8997_led *led =
+			container_of(led_cdev, struct max8997_led, cdev);
+	ssize_t ret = 0;
+
+	mutex_lock(&led->mutex);
+
+	switch (led->led_mode) {
+	case MAX8997_FLASH_MODE:
+		ret += sprintf(buf, "FLASH\n");
+		break;
+	case MAX8997_MOVIE_MODE:
+		ret += sprintf(buf, "MOVIE\n");
+		break;
+	case MAX8997_FLASH_PIN_CONTROL_MODE:
+		ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
+		break;
+	case MAX8997_MOVIE_PIN_CONTROL_MODE:
+		ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
+		break;
+	default:
+		ret += sprintf(buf, "NONE\n");
+		break;
+	}
+
+	mutex_unlock(&led->mutex);
+
+	return ret;
+}
+
+static ssize_t max8997_led_store_mode(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct max8997_led *led =
+			container_of(led_cdev, struct max8997_led, cdev);
+	enum max8997_led_mode mode;
+
+	mutex_lock(&led->mutex);
+
+	if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
+		mode = MAX8997_FLASH_PIN_CONTROL_MODE;
+	else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
+		mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
+	else if (!strncmp(buf, "FLASH", 5))
+		mode = MAX8997_FLASH_MODE;
+	else if (!strncmp(buf, "MOVIE", 5))
+		mode = MAX8997_MOVIE_MODE;
+	else
+		mode = MAX8997_NONE;
+
+	max8997_led_set_mode(led, mode);
+
+	mutex_unlock(&led->mutex);
+
+	return size;
+}
+
+static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);
+
+static struct attribute *max8997_attrs[] = {
+	&dev_attr_mode.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(max8997);
+
+static int max8997_led_probe(struct platform_device *pdev)
+{
+	struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
+	struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
+	struct max8997_led *led;
+	char name[20];
+	int ret = 0;
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "no platform data\n");
+		return -ENODEV;
+	}
+
+	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+	if (led == NULL)
+		return -ENOMEM;
+
+	led->id = pdev->id;
+	snprintf(name, sizeof(name), "max8997-led%d", pdev->id);
+
+	led->cdev.name = name;
+	led->cdev.brightness_set = max8997_led_brightness_set;
+	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
+	led->cdev.brightness = 0;
+	led->cdev.groups = max8997_groups;
+	led->iodev = iodev;
+
+	/* initialize mode and brightness according to platform_data */
+	if (pdata->led_pdata) {
+		u8 mode = 0, brightness = 0;
+
+		mode = pdata->led_pdata->mode[led->id];
+		brightness = pdata->led_pdata->brightness[led->id];
+
+		max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]);
+
+		if (brightness > led->cdev.max_brightness)
+			brightness = led->cdev.max_brightness;
+		max8997_led_set_current(led, brightness);
+		led->cdev.brightness = brightness;
+	} else {
+		max8997_led_set_mode(led, MAX8997_NONE);
+		max8997_led_set_current(led, 0);
+	}
+
+	mutex_init(&led->mutex);
+
+	platform_set_drvdata(pdev, led);
+
+	ret = led_classdev_register(&pdev->dev, &led->cdev);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int max8997_led_remove(struct platform_device *pdev)
+{
+	struct max8997_led *led = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&led->cdev);
+
+	return 0;
+}
+
+static struct platform_driver max8997_led_driver = {
+	.driver = {
+		.name  = "max8997-led",
+		.owner = THIS_MODULE,
+	},
+	.probe  = max8997_led_probe,
+	.remove = max8997_led_remove,
+};
+
+module_platform_driver(max8997_led_driver);
+
+MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
+MODULE_DESCRIPTION("MAX8997 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:max8997-led");

drivers/leds/leds-mc13783.c

@@ -0,0 +1,337 @@
+/*
+ * LEDs driver for Freescale MC13783/MC13892/MC34708
+ *
+ * Copyright (C) 2010 Philippe Rétornaz
+ *
+ * Based on leds-da903x:
+ * Copyright (C) 2008 Compulab, Ltd.
+ *      Mike Rapoport <mike@compulab.co.il>
+ *
+ * Copyright (C) 2006-2008 Marvell International Ltd.
+ *      Eric Miao <eric.miao@marvell.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/of.h>
+#include <linux/workqueue.h>
+#include <linux/mfd/mc13xxx.h>
+
+struct mc13xxx_led_devtype {
+	int	led_min;
+	int	led_max;
+	int	num_regs;
+	u32	ledctrl_base;
+};
+
+struct mc13xxx_led {
+	struct led_classdev	cdev;
+	struct work_struct	work;
+	enum led_brightness	new_brightness;
+	int			id;
+	struct mc13xxx_leds	*leds;
+};
+
+struct mc13xxx_leds {
+	struct mc13xxx			*master;
+	struct mc13xxx_led_devtype	*devtype;
+	int				num_leds;
+	struct mc13xxx_led		*led;
+};
+
+static unsigned int mc13xxx_max_brightness(int id)
+{
+	if (id >= MC13783_LED_MD && id <= MC13783_LED_KP)
+		return 0x0f;
+	else if (id >= MC13783_LED_R1 && id <= MC13783_LED_B3)
+		return 0x1f;
+
+	return 0x3f;
+}
+
+static void mc13xxx_led_work(struct work_struct *work)
+{
+	struct mc13xxx_led *led = container_of(work, struct mc13xxx_led, work);
+	struct mc13xxx_leds *leds = led->leds;
+	unsigned int reg, bank, off, shift;
+
+	switch (led->id) {
+	case MC13783_LED_MD:
+	case MC13783_LED_AD:
+	case MC13783_LED_KP:
+		reg = 2;
+		shift = 9 + (led->id - MC13783_LED_MD) * 4;
+		break;
+	case MC13783_LED_R1:
+	case MC13783_LED_G1:
+	case MC13783_LED_B1:
+	case MC13783_LED_R2:
+	case MC13783_LED_G2:
+	case MC13783_LED_B2:
+	case MC13783_LED_R3:
+	case MC13783_LED_G3:
+	case MC13783_LED_B3:
+		off = led->id - MC13783_LED_R1;
+		bank = off / 3;
+		reg = 3 + bank;
+		shift = (off - bank * 3) * 5 + 6;
+		break;
+	case MC13892_LED_MD:
+	case MC13892_LED_AD:
+	case MC13892_LED_KP:
+		reg = (led->id - MC13892_LED_MD) / 2;
+		shift = 3 + (led->id - MC13892_LED_MD) * 12;
+		break;
+	case MC13892_LED_R:
+	case MC13892_LED_G:
+	case MC13892_LED_B:
+		off = led->id - MC13892_LED_R;
+		bank = off / 2;
+		reg = 2 + bank;
+		shift = (off - bank * 2) * 12 + 3;
+		break;
+	case MC34708_LED_R:
+	case MC34708_LED_G:
+		reg = 0;
+		shift = 3 + (led->id - MC34708_LED_R) * 12;
+		break;
+	default:
+		BUG();
+	}
+
+	mc13xxx_reg_rmw(leds->master, leds->devtype->ledctrl_base + reg,
+			mc13xxx_max_brightness(led->id) << shift,
+			led->new_brightness << shift);
+}
+
+static void mc13xxx_led_set(struct led_classdev *led_cdev,
+			    enum led_brightness value)
+{
+	struct mc13xxx_led *led =
+		container_of(led_cdev, struct mc13xxx_led, cdev);
+
+	led->new_brightness = value;
+	schedule_work(&led->work);
+}
+
+#ifdef CONFIG_OF
+static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
+	struct platform_device *pdev)
+{
+	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
+	struct mc13xxx_leds_platform_data *pdata;
+	struct device_node *parent, *child;
+	struct device *dev = &pdev->dev;
+	int i = 0, ret = -ENODATA;
+
+	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	of_node_get(dev->parent->of_node);
+
+	parent = of_find_node_by_name(dev->parent->of_node, "leds");
+	if (!parent)
+		goto out_node_put;
+
+	ret = of_property_read_u32_array(parent, "led-control",
+					 pdata->led_control,
+					 leds->devtype->num_regs);
+	if (ret)
+		goto out_node_put;
+
+	pdata->num_leds = of_get_child_count(parent);
+
+	pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
+				  GFP_KERNEL);
+	if (!pdata->led) {
+		ret = -ENOMEM;
+		goto out_node_put;
+	}
+
+	for_each_child_of_node(parent, child) {
+		const char *str;
+		u32 tmp;
+
+		if (of_property_read_u32(child, "reg", &tmp))
+			continue;
+		pdata->led[i].id = leds->devtype->led_min + tmp;
+
+		if (!of_property_read_string(child, "label", &str))
+			pdata->led[i].name = str;
+		if (!of_property_read_string(child, "linux,default-trigger",
+					     &str))
+			pdata->led[i].default_trigger = str;
+
+		i++;
+	}
+
+	pdata->num_leds = i;
+	ret = i > 0 ? 0 : -ENODATA;
+
+out_node_put:
+	of_node_put(parent);
+
+	return ret ? ERR_PTR(ret) : pdata;
+}
+#else
+static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
+	struct platform_device *pdev)
+{
+	return ERR_PTR(-ENOSYS);
+}
+#endif
+
+static int __init mc13xxx_led_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mc13xxx_leds_platform_data *pdata = dev_get_platdata(dev);
+	struct mc13xxx *mcdev = dev_get_drvdata(dev->parent);
+	struct mc13xxx_led_devtype *devtype =
+		(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
+	struct mc13xxx_leds *leds;
+	int i, id, ret = -ENODATA;
+	u32 init_led = 0;
+
+	leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
+	if (!leds)
+		return -ENOMEM;
+
+	leds->devtype = devtype;
+	leds->master = mcdev;
+	platform_set_drvdata(pdev, leds);
+
+	if (dev->parent->of_node) {
+		pdata = mc13xxx_led_probe_dt(pdev);
+		if (IS_ERR(pdata))
+			return PTR_ERR(pdata);
+	} else if (!pdata)
+		return -ENODATA;
+
+	leds->num_leds = pdata->num_leds;
+
+	if ((leds->num_leds < 1) ||
+	    (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
+		dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
+		return -EINVAL;
+	}
+
+	leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
+				 GFP_KERNEL);
+	if (!leds->led)
+		return -ENOMEM;
+
+	for (i = 0; i < devtype->num_regs; i++) {
+		ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
+					pdata->led_control[i]);
+		if (ret)
+			return ret;
+	}
+
+	for (i = 0; i < leds->num_leds; i++) {
+		const char *name, *trig;
+
+		ret = -EINVAL;
+
+		id = pdata->led[i].id;
+		name = pdata->led[i].name;
+		trig = pdata->led[i].default_trigger;
+
+		if ((id > devtype->led_max) || (id < devtype->led_min)) {
+			dev_err(dev, "Invalid ID %i\n", id);
+			break;
+		}
+
+		if (init_led & (1 << id)) {
+			dev_warn(dev, "LED %i already initialized\n", id);
+			break;
+		}
+
+		init_led |= 1 << id;
+		leds->led[i].id = id;
+		leds->led[i].leds = leds;
+		leds->led[i].cdev.name = name;
+		leds->led[i].cdev.default_trigger = trig;
+		leds->led[i].cdev.flags = LED_CORE_SUSPENDRESUME;
+		leds->led[i].cdev.brightness_set = mc13xxx_led_set;
+		leds->led[i].cdev.max_brightness = mc13xxx_max_brightness(id);
+
+		INIT_WORK(&leds->led[i].work, mc13xxx_led_work);
+
+		ret = led_classdev_register(dev->parent, &leds->led[i].cdev);
+		if (ret) {
+			dev_err(dev, "Failed to register LED %i\n", id);
+			break;
+		}
+	}
+
+	if (ret)
+		while (--i >= 0) {
+			led_classdev_unregister(&leds->led[i].cdev);
+			cancel_work_sync(&leds->led[i].work);
+		}
+
+	return ret;
+}
+
+static int mc13xxx_led_remove(struct platform_device *pdev)
+{
+	struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < leds->num_leds; i++) {
+		led_classdev_unregister(&leds->led[i].cdev);
+		cancel_work_sync(&leds->led[i].work);
+	}
+
+	return 0;
+}
+
+static const struct mc13xxx_led_devtype mc13783_led_devtype = {
+	.led_min	= MC13783_LED_MD,
+	.led_max	= MC13783_LED_B3,
+	.num_regs	= 6,
+	.ledctrl_base	= 51,
+};
+
+static const struct mc13xxx_led_devtype mc13892_led_devtype = {
+	.led_min	= MC13892_LED_MD,
+	.led_max	= MC13892_LED_B,
+	.num_regs	= 4,
+	.ledctrl_base	= 51,
+};
+
+static const struct mc13xxx_led_devtype mc34708_led_devtype = {
+	.led_min	= MC34708_LED_R,
+	.led_max	= MC34708_LED_G,
+	.num_regs	= 1,
+	.ledctrl_base	= 54,
+};
+
+static const struct platform_device_id mc13xxx_led_id_table[] = {
+	{ "mc13783-led", (kernel_ulong_t)&mc13783_led_devtype, },
+	{ "mc13892-led", (kernel_ulong_t)&mc13892_led_devtype, },
+	{ "mc34708-led", (kernel_ulong_t)&mc34708_led_devtype, },
+	{ }
+};
+MODULE_DEVICE_TABLE(platform, mc13xxx_led_id_table);
+
+static struct platform_driver mc13xxx_led_driver = {
+	.driver	= {
+		.name	= "mc13xxx-led",
+		.owner	= THIS_MODULE,
+	},
+	.remove		= mc13xxx_led_remove,
+	.id_table	= mc13xxx_led_id_table,
+};
+module_platform_driver_probe(mc13xxx_led_driver, mc13xxx_led_probe);
+
+MODULE_DESCRIPTION("LEDs driver for Freescale MC13XXX PMIC");
+MODULE_AUTHOR("Philippe Retornaz <philippe.retornaz@epfl.ch>");
+MODULE_LICENSE("GPL");

drivers/leds/leds-menf21bmc.c

@@ -0,0 +1,131 @@
+/*
+ *  MEN 14F021P00 Board Management Controller (BMC) LEDs Driver.
+ *
+ *  This is the core LED driver of the MEN 14F021P00 BMC.
+ *  There are four LEDs available which can be switched on and off.
+ *  STATUS LED, HOT SWAP LED, USER LED 1, USER LED 2
+ *
+ *  Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/i2c.h>
+
+#define BMC_CMD_LED_GET_SET	0xA0
+#define BMC_BIT_LED_STATUS	BIT(0)
+#define BMC_BIT_LED_HOTSWAP	BIT(1)
+#define BMC_BIT_LED_USER1	BIT(2)
+#define BMC_BIT_LED_USER2	BIT(3)
+
+struct menf21bmc_led {
+	struct led_classdev cdev;
+	u8 led_bit;
+	const char *name;
+	struct i2c_client *i2c_client;
+};
+
+static struct menf21bmc_led leds[] = {
+	{
+		.name = "menf21bmc:led_status",
+		.led_bit = BMC_BIT_LED_STATUS,
+	},
+	{
+		.name = "menf21bmc:led_hotswap",
+		.led_bit = BMC_BIT_LED_HOTSWAP,
+	},
+	{
+		.name = "menf21bmc:led_user1",
+		.led_bit = BMC_BIT_LED_USER1,
+	},
+	{
+		.name = "menf21bmc:led_user2",
+		.led_bit = BMC_BIT_LED_USER2,
+	}
+};
+
+static DEFINE_MUTEX(led_lock);
+
+static void
+menf21bmc_led_set(struct led_classdev *led_cdev, enum led_brightness value)
+{
+	int led_val;
+	struct menf21bmc_led *led = container_of(led_cdev,
+					struct menf21bmc_led, cdev);
+
+	mutex_lock(&led_lock);
+	led_val = i2c_smbus_read_byte_data(led->i2c_client,
+					   BMC_CMD_LED_GET_SET);
+	if (led_val < 0)
+		goto err_out;
+
+	if (value == LED_OFF)
+		led_val &= ~led->led_bit;
+	else
+		led_val |= led->led_bit;
+
+	i2c_smbus_write_byte_data(led->i2c_client,
+				  BMC_CMD_LED_GET_SET, led_val);
+err_out:
+	mutex_unlock(&led_lock);
+}
+
+static int menf21bmc_led_probe(struct platform_device *pdev)
+{
+	int i;
+	int ret;
+	struct i2c_client *i2c_client = to_i2c_client(pdev->dev.parent);
+
+	for (i = 0; i < ARRAY_SIZE(leds); i++) {
+		leds[i].cdev.name = leds[i].name;
+		leds[i].cdev.brightness_set = menf21bmc_led_set;
+		leds[i].i2c_client = i2c_client;
+		ret = led_classdev_register(&pdev->dev, &leds[i].cdev);
+		if (ret < 0)
+			goto err_free_leds;
+	}
+	dev_info(&pdev->dev, "MEN 140F21P00 BMC LED device enabled\n");
+
+	return 0;
+
+err_free_leds:
+	dev_err(&pdev->dev, "failed to register LED device\n");
+
+	for (i = i - 1; i >= 0; i--)
+		led_classdev_unregister(&leds[i].cdev);
+
+	return ret;
+}
+
+static int menf21bmc_led_remove(struct platform_device *pdev)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(leds); i++)
+		led_classdev_unregister(&leds[i].cdev);
+
+	return 0;
+}
+
+static struct platform_driver menf21bmc_led = {
+	.probe		= menf21bmc_led_probe,
+	.remove		= menf21bmc_led_remove,
+	.driver		= {
+		.name		= "menf21bmc_led",
+		.owner		= THIS_MODULE,
+	},
+};
+
+module_platform_driver(menf21bmc_led);
+
+MODULE_AUTHOR("Andreas Werner <andreas.werner@men.de>");
+MODULE_DESCRIPTION("MEN 14F021P00 BMC led driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:menf21bmc_led");

drivers/leds/leds-net48xx.c

@@ -0,0 +1,97 @@
+/*
+ * LEDs driver for Soekris net48xx
+ *
+ * Copyright (C) 2006 Chris Boot <bootc@bootc.net>
+ *
+ * Based on leds-ams-delta.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/nsc_gpio.h>
+#include <linux/scx200_gpio.h>
+#include <linux/module.h>
+
+#define DRVNAME "net48xx-led"
+#define NET48XX_ERROR_LED_GPIO	20
+
+static struct platform_device *pdev;
+
+static void net48xx_error_led_set(struct led_classdev *led_cdev,
+		enum led_brightness value)
+{
+	scx200_gpio_ops.gpio_set(NET48XX_ERROR_LED_GPIO, value ? 1 : 0);
+}
+
+static struct led_classdev net48xx_error_led = {
+	.name		= "net48xx::error",
+	.brightness_set	= net48xx_error_led_set,
+	.flags		= LED_CORE_SUSPENDRESUME,
+};
+
+static int net48xx_led_probe(struct platform_device *pdev)
+{
+	return led_classdev_register(&pdev->dev, &net48xx_error_led);
+}
+
+static int net48xx_led_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&net48xx_error_led);
+	return 0;
+}
+
+static struct platform_driver net48xx_led_driver = {
+	.probe		= net48xx_led_probe,
+	.remove		= net48xx_led_remove,
+	.driver		= {
+		.name		= DRVNAME,
+		.owner		= THIS_MODULE,
+	},
+};
+
+static int __init net48xx_led_init(void)
+{
+	int ret;
+
+	/* small hack, but scx200_gpio doesn't set .dev if the probe fails */
+	if (!scx200_gpio_ops.dev) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	ret = platform_driver_register(&net48xx_led_driver);
+	if (ret < 0)
+		goto out;
+
+	pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
+	if (IS_ERR(pdev)) {
+		ret = PTR_ERR(pdev);
+		platform_driver_unregister(&net48xx_led_driver);
+		goto out;
+	}
+
+out:
+	return ret;
+}
+
+static void __exit net48xx_led_exit(void)
+{
+	platform_device_unregister(pdev);
+	platform_driver_unregister(&net48xx_led_driver);
+}
+
+module_init(net48xx_led_init);
+module_exit(net48xx_led_exit);
+
+MODULE_AUTHOR("Chris Boot <bootc@bootc.net>");
+MODULE_DESCRIPTION("Soekris net48xx LED driver");
+MODULE_LICENSE("GPL");
+

drivers/leds/leds-netxbig.c

@@ -0,0 +1,416 @@
+/*
+ * leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
+ *
+ * Copyright (C) 2010 LaCie
+ *
+ * Author: Simon Guinot <sguinot@lacie.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/module.h>
+#include <linux/irq.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/leds.h>
+#include <linux/platform_data/leds-kirkwood-netxbig.h>
+
+/*
+ * GPIO extension bus.
+ */
+
+static DEFINE_SPINLOCK(gpio_ext_lock);
+
+static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
+{
+	int pin;
+
+	for (pin = 0; pin < gpio_ext->num_addr; pin++)
+		gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
+}
+
+static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
+{
+	int pin;
+
+	for (pin = 0; pin < gpio_ext->num_data; pin++)
+		gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1);
+}
+
+static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
+{
+	/* Enable select is done on the raising edge. */
+	gpio_set_value(gpio_ext->enable, 0);
+	gpio_set_value(gpio_ext->enable, 1);
+}
+
+static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
+			       int addr, int value)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&gpio_ext_lock, flags);
+	gpio_ext_set_addr(gpio_ext, addr);
+	gpio_ext_set_data(gpio_ext, value);
+	gpio_ext_enable_select(gpio_ext);
+	spin_unlock_irqrestore(&gpio_ext_lock, flags);
+}
+
+static int gpio_ext_init(struct netxbig_gpio_ext *gpio_ext)
+{
+	int err;
+	int i;
+
+	if (unlikely(!gpio_ext))
+		return -EINVAL;
+
+	/* Configure address GPIOs. */
+	for (i = 0; i < gpio_ext->num_addr; i++) {
+		err = gpio_request_one(gpio_ext->addr[i], GPIOF_OUT_INIT_LOW,
+				       "GPIO extension addr");
+		if (err)
+			goto err_free_addr;
+	}
+	/* Configure data GPIOs. */
+	for (i = 0; i < gpio_ext->num_data; i++) {
+		err = gpio_request_one(gpio_ext->data[i], GPIOF_OUT_INIT_LOW,
+				   "GPIO extension data");
+		if (err)
+			goto err_free_data;
+	}
+	/* Configure "enable select" GPIO. */
+	err = gpio_request_one(gpio_ext->enable, GPIOF_OUT_INIT_LOW,
+			       "GPIO extension enable");
+	if (err)
+		goto err_free_data;
+
+	return 0;
+
+err_free_data:
+	for (i = i - 1; i >= 0; i--)
+		gpio_free(gpio_ext->data[i]);
+	i = gpio_ext->num_addr;
+err_free_addr:
+	for (i = i - 1; i >= 0; i--)
+		gpio_free(gpio_ext->addr[i]);
+
+	return err;
+}
+
+static void gpio_ext_free(struct netxbig_gpio_ext *gpio_ext)
+{
+	int i;
+
+	gpio_free(gpio_ext->enable);
+	for (i = gpio_ext->num_addr - 1; i >= 0; i--)
+		gpio_free(gpio_ext->addr[i]);
+	for (i = gpio_ext->num_data - 1; i >= 0; i--)
+		gpio_free(gpio_ext->data[i]);
+}
+
+/*
+ * Class LED driver.
+ */
+
+struct netxbig_led_data {
+	struct netxbig_gpio_ext	*gpio_ext;
+	struct led_classdev	cdev;
+	int			mode_addr;
+	int			*mode_val;
+	int			bright_addr;
+	int			bright_max;
+	struct			netxbig_led_timer *timer;
+	int			num_timer;
+	enum netxbig_led_mode	mode;
+	int			sata;
+	spinlock_t		lock;
+};
+
+static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
+				      unsigned long delay_on,
+				      unsigned long delay_off,
+				      struct netxbig_led_timer *timer,
+				      int num_timer)
+{
+	int i;
+
+	for (i = 0; i < num_timer; i++) {
+		if (timer[i].delay_on == delay_on &&
+		    timer[i].delay_off == delay_off) {
+			*mode = timer[i].mode;
+			return 0;
+		}
+	}
+	return -EINVAL;
+}
+
+static int netxbig_led_blink_set(struct led_classdev *led_cdev,
+				 unsigned long *delay_on,
+				 unsigned long *delay_off)
+{
+	struct netxbig_led_data *led_dat =
+		container_of(led_cdev, struct netxbig_led_data, cdev);
+	enum netxbig_led_mode mode;
+	int mode_val;
+	int ret;
+
+	/* Look for a LED mode with the requested timer frequency. */
+	ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off,
+					 led_dat->timer, led_dat->num_timer);
+	if (ret < 0)
+		return ret;
+
+	mode_val = led_dat->mode_val[mode];
+	if (mode_val == NETXBIG_LED_INVALID_MODE)
+		return -EINVAL;
+
+	spin_lock_irq(&led_dat->lock);
+
+	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
+	led_dat->mode = mode;
+
+	spin_unlock_irq(&led_dat->lock);
+
+	return 0;
+}
+
+static void netxbig_led_set(struct led_classdev *led_cdev,
+			    enum led_brightness value)
+{
+	struct netxbig_led_data *led_dat =
+		container_of(led_cdev, struct netxbig_led_data, cdev);
+	enum netxbig_led_mode mode;
+	int mode_val, bright_val;
+	int set_brightness = 1;
+	unsigned long flags;
+
+	spin_lock_irqsave(&led_dat->lock, flags);
+
+	if (value == LED_OFF) {
+		mode = NETXBIG_LED_OFF;
+		set_brightness = 0;
+	} else {
+		if (led_dat->sata)
+			mode = NETXBIG_LED_SATA;
+		else if (led_dat->mode == NETXBIG_LED_OFF)
+			mode = NETXBIG_LED_ON;
+		else /* Keep 'timer' mode. */
+			mode = led_dat->mode;
+	}
+	mode_val = led_dat->mode_val[mode];
+
+	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
+	led_dat->mode = mode;
+	/*
+	 * Note that the brightness register is shared between all the
+	 * SATA LEDs. So, change the brightness setting for a single
+	 * SATA LED will affect all the others.
+	 */
+	if (set_brightness) {
+		bright_val = DIV_ROUND_UP(value * led_dat->bright_max,
+					  LED_FULL);
+		gpio_ext_set_value(led_dat->gpio_ext,
+				   led_dat->bright_addr, bright_val);
+	}
+
+	spin_unlock_irqrestore(&led_dat->lock, flags);
+}
+
+static ssize_t netxbig_led_sata_store(struct device *dev,
+				      struct device_attribute *attr,
+				      const char *buff, size_t count)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct netxbig_led_data *led_dat =
+		container_of(led_cdev, struct netxbig_led_data, cdev);
+	unsigned long enable;
+	enum netxbig_led_mode mode;
+	int mode_val;
+	int ret;
+
+	ret = kstrtoul(buff, 10, &enable);
+	if (ret < 0)
+		return ret;
+
+	enable = !!enable;
+
+	spin_lock_irq(&led_dat->lock);
+
+	if (led_dat->sata == enable) {
+		ret = count;
+		goto exit_unlock;
+	}
+
+	if (led_dat->mode != NETXBIG_LED_ON &&
+	    led_dat->mode != NETXBIG_LED_SATA)
+		mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
+	else if (enable)
+		mode = NETXBIG_LED_SATA;
+	else
+		mode = NETXBIG_LED_ON;
+
+	mode_val = led_dat->mode_val[mode];
+	if (mode_val == NETXBIG_LED_INVALID_MODE) {
+		ret = -EINVAL;
+		goto exit_unlock;
+	}
+
+	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
+	led_dat->mode = mode;
+	led_dat->sata = enable;
+
+	ret = count;
+
+exit_unlock:
+	spin_unlock_irq(&led_dat->lock);
+
+	return ret;
+}
+
+static ssize_t netxbig_led_sata_show(struct device *dev,
+				     struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct netxbig_led_data *led_dat =
+		container_of(led_cdev, struct netxbig_led_data, cdev);
+
+	return sprintf(buf, "%d\n", led_dat->sata);
+}
+
+static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
+
+static struct attribute *netxbig_led_attrs[] = {
+	&dev_attr_sata.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(netxbig_led);
+
+static void delete_netxbig_led(struct netxbig_led_data *led_dat)
+{
+	led_classdev_unregister(&led_dat->cdev);
+}
+
+static int
+create_netxbig_led(struct platform_device *pdev,
+		   struct netxbig_led_data *led_dat,
+		   const struct netxbig_led *template)
+{
+	struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+
+	spin_lock_init(&led_dat->lock);
+	led_dat->gpio_ext = pdata->gpio_ext;
+	led_dat->cdev.name = template->name;
+	led_dat->cdev.default_trigger = template->default_trigger;
+	led_dat->cdev.blink_set = netxbig_led_blink_set;
+	led_dat->cdev.brightness_set = netxbig_led_set;
+	/*
+	 * Because the GPIO extension bus don't allow to read registers
+	 * value, there is no way to probe the LED initial state.
+	 * So, the initial sysfs LED value for the "brightness" and "sata"
+	 * attributes are inconsistent.
+	 *
+	 * Note that the initial LED state can't be reconfigured.
+	 * The reason is that the LED behaviour must stay uniform during
+	 * the whole boot process (bootloader+linux).
+	 */
+	led_dat->sata = 0;
+	led_dat->cdev.brightness = LED_OFF;
+	led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+	led_dat->mode_addr = template->mode_addr;
+	led_dat->mode_val = template->mode_val;
+	led_dat->bright_addr = template->bright_addr;
+	led_dat->bright_max = (1 << pdata->gpio_ext->num_data) - 1;
+	led_dat->timer = pdata->timer;
+	led_dat->num_timer = pdata->num_timer;
+	/*
+	 * If available, expose the SATA activity blink capability through
+	 * a "sata" sysfs attribute.
+	 */
+	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
+		led_dat->cdev.groups = netxbig_led_groups;
+
+	return led_classdev_register(&pdev->dev, &led_dat->cdev);
+}
+
+static int netxbig_led_probe(struct platform_device *pdev)
+{
+	struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct netxbig_led_data *leds_data;
+	int i;
+	int ret;
+
+	if (!pdata)
+		return -EINVAL;
+
+	leds_data = devm_kzalloc(&pdev->dev,
+		sizeof(struct netxbig_led_data) * pdata->num_leds, GFP_KERNEL);
+	if (!leds_data)
+		return -ENOMEM;
+
+	ret = gpio_ext_init(pdata->gpio_ext);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < pdata->num_leds; i++) {
+		ret = create_netxbig_led(pdev, &leds_data[i], &pdata->leds[i]);
+		if (ret < 0)
+			goto err_free_leds;
+	}
+
+	platform_set_drvdata(pdev, leds_data);
+
+	return 0;
+
+err_free_leds:
+	for (i = i - 1; i >= 0; i--)
+		delete_netxbig_led(&leds_data[i]);
+
+	gpio_ext_free(pdata->gpio_ext);
+	return ret;
+}
+
+static int netxbig_led_remove(struct platform_device *pdev)
+{
+	struct netxbig_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct netxbig_led_data *leds_data;
+	int i;
+
+	leds_data = platform_get_drvdata(pdev);
+
+	for (i = 0; i < pdata->num_leds; i++)
+		delete_netxbig_led(&leds_data[i]);
+
+	gpio_ext_free(pdata->gpio_ext);
+
+	return 0;
+}
+
+static struct platform_driver netxbig_led_driver = {
+	.probe		= netxbig_led_probe,
+	.remove		= netxbig_led_remove,
+	.driver		= {
+		.name	= "leds-netxbig",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(netxbig_led_driver);
+
+MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
+MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-netxbig");

drivers/leds/leds-ns2.c

@@ -0,0 +1,393 @@
+/*
+ * leds-ns2.c - Driver for the Network Space v2 (and parents) dual-GPIO LED
+ *
+ * Copyright (C) 2010 LaCie
+ *
+ * Author: Simon Guinot <sguinot@lacie.com>
+ *
+ * Based on leds-gpio.c by Raphael Assenat <raph@8d.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_data/leds-kirkwood-ns2.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+
+/*
+ * The Network Space v2 dual-GPIO LED is wired to a CPLD and can blink in
+ * relation with the SATA activity. This capability is exposed through the
+ * "sata" sysfs attribute.
+ *
+ * The following array detail the different LED registers and the combination
+ * of their possible values:
+ *
+ *  cmd_led   |  slow_led  | /SATA active | LED state
+ *            |            |              |
+ *     1      |     0      |      x       |  off
+ *     -      |     1      |      x       |  on
+ *     0      |     0      |      1       |  on
+ *     0      |     0      |      0       |  blink (rate 300ms)
+ */
+
+enum ns2_led_modes {
+	NS_V2_LED_OFF,
+	NS_V2_LED_ON,
+	NS_V2_LED_SATA,
+};
+
+struct ns2_led_mode_value {
+	enum ns2_led_modes	mode;
+	int			cmd_level;
+	int			slow_level;
+};
+
+static struct ns2_led_mode_value ns2_led_modval[] = {
+	{ NS_V2_LED_OFF	, 1, 0 },
+	{ NS_V2_LED_ON	, 0, 1 },
+	{ NS_V2_LED_ON	, 1, 1 },
+	{ NS_V2_LED_SATA, 0, 0 },
+};
+
+struct ns2_led_data {
+	struct led_classdev	cdev;
+	unsigned		cmd;
+	unsigned		slow;
+	unsigned char		sata; /* True when SATA mode active. */
+	rwlock_t		rw_lock; /* Lock GPIOs. */
+};
+
+static int ns2_led_get_mode(struct ns2_led_data *led_dat,
+			    enum ns2_led_modes *mode)
+{
+	int i;
+	int ret = -EINVAL;
+	int cmd_level;
+	int slow_level;
+
+	read_lock_irq(&led_dat->rw_lock);
+
+	cmd_level = gpio_get_value(led_dat->cmd);
+	slow_level = gpio_get_value(led_dat->slow);
+
+	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
+		if (cmd_level == ns2_led_modval[i].cmd_level &&
+		    slow_level == ns2_led_modval[i].slow_level) {
+			*mode = ns2_led_modval[i].mode;
+			ret = 0;
+			break;
+		}
+	}
+
+	read_unlock_irq(&led_dat->rw_lock);
+
+	return ret;
+}
+
+static void ns2_led_set_mode(struct ns2_led_data *led_dat,
+			     enum ns2_led_modes mode)
+{
+	int i;
+	unsigned long flags;
+
+	write_lock_irqsave(&led_dat->rw_lock, flags);
+
+	for (i = 0; i < ARRAY_SIZE(ns2_led_modval); i++) {
+		if (mode == ns2_led_modval[i].mode) {
+			gpio_set_value(led_dat->cmd,
+				       ns2_led_modval[i].cmd_level);
+			gpio_set_value(led_dat->slow,
+				       ns2_led_modval[i].slow_level);
+		}
+	}
+
+	write_unlock_irqrestore(&led_dat->rw_lock, flags);
+}
+
+static void ns2_led_set(struct led_classdev *led_cdev,
+			enum led_brightness value)
+{
+	struct ns2_led_data *led_dat =
+		container_of(led_cdev, struct ns2_led_data, cdev);
+	enum ns2_led_modes mode;
+
+	if (value == LED_OFF)
+		mode = NS_V2_LED_OFF;
+	else if (led_dat->sata)
+		mode = NS_V2_LED_SATA;
+	else
+		mode = NS_V2_LED_ON;
+
+	ns2_led_set_mode(led_dat, mode);
+}
+
+static ssize_t ns2_led_sata_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buff, size_t count)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct ns2_led_data *led_dat =
+		container_of(led_cdev, struct ns2_led_data, cdev);
+	int ret;
+	unsigned long enable;
+	enum ns2_led_modes mode;
+
+	ret = kstrtoul(buff, 10, &enable);
+	if (ret < 0)
+		return ret;
+
+	enable = !!enable;
+
+	if (led_dat->sata == enable)
+		return count;
+
+	ret = ns2_led_get_mode(led_dat, &mode);
+	if (ret < 0)
+		return ret;
+
+	if (enable && mode == NS_V2_LED_ON)
+		ns2_led_set_mode(led_dat, NS_V2_LED_SATA);
+	if (!enable && mode == NS_V2_LED_SATA)
+		ns2_led_set_mode(led_dat, NS_V2_LED_ON);
+
+	led_dat->sata = enable;
+
+	return count;
+}
+
+static ssize_t ns2_led_sata_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct ns2_led_data *led_dat =
+		container_of(led_cdev, struct ns2_led_data, cdev);
+
+	return sprintf(buf, "%d\n", led_dat->sata);
+}
+
+static DEVICE_ATTR(sata, 0644, ns2_led_sata_show, ns2_led_sata_store);
+
+static struct attribute *ns2_led_attrs[] = {
+	&dev_attr_sata.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(ns2_led);
+
+static int
+create_ns2_led(struct platform_device *pdev, struct ns2_led_data *led_dat,
+	       const struct ns2_led *template)
+{
+	int ret;
+	enum ns2_led_modes mode;
+
+	ret = devm_gpio_request_one(&pdev->dev, template->cmd,
+			gpio_get_value(template->cmd) ?
+			GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+			template->name);
+	if (ret) {
+		dev_err(&pdev->dev, "%s: failed to setup command GPIO\n",
+			template->name);
+		return ret;
+	}
+
+	ret = devm_gpio_request_one(&pdev->dev, template->slow,
+			gpio_get_value(template->slow) ?
+			GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+			template->name);
+	if (ret) {
+		dev_err(&pdev->dev, "%s: failed to setup slow GPIO\n",
+			template->name);
+		return ret;
+	}
+
+	rwlock_init(&led_dat->rw_lock);
+
+	led_dat->cdev.name = template->name;
+	led_dat->cdev.default_trigger = template->default_trigger;
+	led_dat->cdev.blink_set = NULL;
+	led_dat->cdev.brightness_set = ns2_led_set;
+	led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+	led_dat->cdev.groups = ns2_led_groups;
+	led_dat->cmd = template->cmd;
+	led_dat->slow = template->slow;
+
+	ret = ns2_led_get_mode(led_dat, &mode);
+	if (ret < 0)
+		return ret;
+
+	/* Set LED initial state. */
+	led_dat->sata = (mode == NS_V2_LED_SATA) ? 1 : 0;
+	led_dat->cdev.brightness =
+		(mode == NS_V2_LED_OFF) ? LED_OFF : LED_FULL;
+
+	ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static void delete_ns2_led(struct ns2_led_data *led_dat)
+{
+	led_classdev_unregister(&led_dat->cdev);
+}
+
+#ifdef CONFIG_OF_GPIO
+/*
+ * Translate OpenFirmware node properties into platform_data.
+ */
+static int
+ns2_leds_get_of_pdata(struct device *dev, struct ns2_led_platform_data *pdata)
+{
+	struct device_node *np = dev->of_node;
+	struct device_node *child;
+	struct ns2_led *leds;
+	int num_leds = 0;
+	int i = 0;
+
+	num_leds = of_get_child_count(np);
+	if (!num_leds)
+		return -ENODEV;
+
+	leds = devm_kzalloc(dev, num_leds * sizeof(struct ns2_led),
+			    GFP_KERNEL);
+	if (!leds)
+		return -ENOMEM;
+
+	for_each_child_of_node(np, child) {
+		const char *string;
+		int ret;
+
+		ret = of_get_named_gpio(child, "cmd-gpio", 0);
+		if (ret < 0)
+			return ret;
+		leds[i].cmd = ret;
+		ret = of_get_named_gpio(child, "slow-gpio", 0);
+		if (ret < 0)
+			return ret;
+		leds[i].slow = ret;
+		ret = of_property_read_string(child, "label", &string);
+		leds[i].name = (ret == 0) ? string : child->name;
+		ret = of_property_read_string(child, "linux,default-trigger",
+					      &string);
+		if (ret == 0)
+			leds[i].default_trigger = string;
+
+		i++;
+	}
+
+	pdata->leds = leds;
+	pdata->num_leds = num_leds;
+
+	return 0;
+}
+
+static const struct of_device_id of_ns2_leds_match[] = {
+	{ .compatible = "lacie,ns2-leds", },
+	{},
+};
+#endif /* CONFIG_OF_GPIO */
+
+struct ns2_led_priv {
+	int num_leds;
+	struct ns2_led_data leds_data[];
+};
+
+static inline int sizeof_ns2_led_priv(int num_leds)
+{
+	return sizeof(struct ns2_led_priv) +
+		      (sizeof(struct ns2_led_data) * num_leds);
+}
+
+static int ns2_led_probe(struct platform_device *pdev)
+{
+	struct ns2_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct ns2_led_priv *priv;
+	int i;
+	int ret;
+
+#ifdef CONFIG_OF_GPIO
+	if (!pdata) {
+		pdata = devm_kzalloc(&pdev->dev,
+				     sizeof(struct ns2_led_platform_data),
+				     GFP_KERNEL);
+		if (!pdata)
+			return -ENOMEM;
+
+		ret = ns2_leds_get_of_pdata(&pdev->dev, pdata);
+		if (ret)
+			return ret;
+	}
+#else
+	if (!pdata)
+		return -EINVAL;
+#endif /* CONFIG_OF_GPIO */
+
+	priv = devm_kzalloc(&pdev->dev,
+			    sizeof_ns2_led_priv(pdata->num_leds), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+	priv->num_leds = pdata->num_leds;
+
+	for (i = 0; i < priv->num_leds; i++) {
+		ret = create_ns2_led(pdev, &priv->leds_data[i],
+				     &pdata->leds[i]);
+		if (ret < 0) {
+			for (i = i - 1; i >= 0; i--)
+				delete_ns2_led(&priv->leds_data[i]);
+			return ret;
+		}
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	return 0;
+}
+
+static int ns2_led_remove(struct platform_device *pdev)
+{
+	int i;
+	struct ns2_led_priv *priv;
+
+	priv = platform_get_drvdata(pdev);
+
+	for (i = 0; i < priv->num_leds; i++)
+		delete_ns2_led(&priv->leds_data[i]);
+
+	return 0;
+}
+
+static struct platform_driver ns2_led_driver = {
+	.probe		= ns2_led_probe,
+	.remove		= ns2_led_remove,
+	.driver		= {
+		.name		= "leds-ns2",
+		.owner		= THIS_MODULE,
+		.of_match_table	= of_match_ptr(of_ns2_leds_match),
+	},
+};
+
+module_platform_driver(ns2_led_driver);
+
+MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
+MODULE_DESCRIPTION("Network Space v2 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-ns2");

drivers/leds/leds-ot200.c

@@ -0,0 +1,170 @@
+/*
+ * Bachmann ot200 leds driver.
+ *
+ * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+ *         Christian Gmeiner <christian.gmeiner@gmail.com>
+ *
+ * License: GPL as published by the FSF.
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/io.h>
+#include <linux/module.h>
+
+
+struct ot200_led {
+	struct led_classdev cdev;
+	const char *name;
+	unsigned long port;
+	u8 mask;
+};
+
+/*
+ * The device has three leds on the back panel (led_err, led_init and led_run)
+ * and can handle up to seven leds on the front panel.
+ */
+
+static struct ot200_led leds[] = {
+	{
+		.name = "led_run",
+		.port = 0x5a,
+		.mask = BIT(0),
+	},
+	{
+		.name = "led_init",
+		.port = 0x5a,
+		.mask = BIT(1),
+	},
+	{
+		.name = "led_err",
+		.port = 0x5a,
+		.mask = BIT(2),
+	},
+	{
+		.name = "led_1",
+		.port = 0x49,
+		.mask = BIT(6),
+	},
+	{
+		.name = "led_2",
+		.port = 0x49,
+		.mask = BIT(5),
+	},
+	{
+		.name = "led_3",
+		.port = 0x49,
+		.mask = BIT(4),
+	},
+	{
+		.name = "led_4",
+		.port = 0x49,
+		.mask = BIT(3),
+	},
+	{
+		.name = "led_5",
+		.port = 0x49,
+		.mask = BIT(2),
+	},
+	{
+		.name = "led_6",
+		.port = 0x49,
+		.mask = BIT(1),
+	},
+	{
+		.name = "led_7",
+		.port = 0x49,
+		.mask = BIT(0),
+	}
+};
+
+static DEFINE_SPINLOCK(value_lock);
+
+/*
+ * we need to store the current led states, as it is not
+ * possible to read the current led state via inb().
+ */
+static u8 leds_back;
+static u8 leds_front;
+
+static void ot200_led_brightness_set(struct led_classdev *led_cdev,
+		enum led_brightness value)
+{
+	struct ot200_led *led = container_of(led_cdev, struct ot200_led, cdev);
+	u8 *val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&value_lock, flags);
+
+	if (led->port == 0x49)
+		val = &leds_front;
+	else if (led->port == 0x5a)
+		val = &leds_back;
+	else
+		BUG();
+
+	if (value == LED_OFF)
+		*val &= ~led->mask;
+	else
+		*val |= led->mask;
+
+	outb(*val, led->port);
+	spin_unlock_irqrestore(&value_lock, flags);
+}
+
+static int ot200_led_probe(struct platform_device *pdev)
+{
+	int i;
+	int ret;
+
+	for (i = 0; i < ARRAY_SIZE(leds); i++) {
+
+		leds[i].cdev.name = leds[i].name;
+		leds[i].cdev.brightness_set = ot200_led_brightness_set;
+
+		ret = led_classdev_register(&pdev->dev, &leds[i].cdev);
+		if (ret < 0)
+			goto err;
+	}
+
+	leds_front = 0;		/* turn off all front leds */
+	leds_back = BIT(1);	/* turn on init led */
+	outb(leds_front, 0x49);
+	outb(leds_back, 0x5a);
+
+	return 0;
+
+err:
+	for (i = i - 1; i >= 0; i--)
+		led_classdev_unregister(&leds[i].cdev);
+
+	return ret;
+}
+
+static int ot200_led_remove(struct platform_device *pdev)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(leds); i++)
+		led_classdev_unregister(&leds[i].cdev);
+
+	return 0;
+}
+
+static struct platform_driver ot200_led_driver = {
+	.probe		= ot200_led_probe,
+	.remove		= ot200_led_remove,
+	.driver		= {
+		.name	= "leds-ot200",
+		.owner	= THIS_MODULE,
+	},
+};
+
+module_platform_driver(ot200_led_driver);
+
+MODULE_AUTHOR("Sebastian A. Siewior <bigeasy@linutronix.de>");
+MODULE_DESCRIPTION("ot200 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-ot200");

drivers/leds/leds-pca9532.c

@@ -0,0 +1,483 @@
+/*
+ * pca9532.c - 16-bit Led dimmer
+ *
+ * Copyright (C) 2011 Jan Weitzel
+ * Copyright (C) 2008 Riku Voipio
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * Datasheet: http://www.nxp.com/documents/data_sheet/PCA9532.pdf
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/input.h>
+#include <linux/mutex.h>
+#include <linux/workqueue.h>
+#include <linux/leds-pca9532.h>
+#include <linux/gpio.h>
+
+/* m =  num_leds*/
+#define PCA9532_REG_INPUT(i)	((i) >> 3)
+#define PCA9532_REG_OFFSET(m)	((m) >> 4)
+#define PCA9532_REG_PSC(m, i)	(PCA9532_REG_OFFSET(m) + 0x1 + (i) * 2)
+#define PCA9532_REG_PWM(m, i)	(PCA9532_REG_OFFSET(m) + 0x2 + (i) * 2)
+#define LED_REG(m, led)		(PCA9532_REG_OFFSET(m) + 0x5 + (led >> 2))
+#define LED_NUM(led)		(led & 0x3)
+
+#define ldev_to_led(c)       container_of(c, struct pca9532_led, ldev)
+
+struct pca9532_chip_info {
+	u8	num_leds;
+};
+
+struct pca9532_data {
+	struct i2c_client *client;
+	struct pca9532_led leds[16];
+	struct mutex update_lock;
+	struct input_dev *idev;
+	struct work_struct work;
+#ifdef CONFIG_LEDS_PCA9532_GPIO
+	struct gpio_chip gpio;
+#endif
+	const struct pca9532_chip_info *chip_info;
+	u8 pwm[2];
+	u8 psc[2];
+};
+
+static int pca9532_probe(struct i2c_client *client,
+	const struct i2c_device_id *id);
+static int pca9532_remove(struct i2c_client *client);
+
+enum {
+	pca9530,
+	pca9531,
+	pca9532,
+	pca9533,
+};
+
+static const struct i2c_device_id pca9532_id[] = {
+	{ "pca9530", pca9530 },
+	{ "pca9531", pca9531 },
+	{ "pca9532", pca9532 },
+	{ "pca9533", pca9533 },
+	{ }
+};
+
+MODULE_DEVICE_TABLE(i2c, pca9532_id);
+
+static const struct pca9532_chip_info pca9532_chip_info_tbl[] = {
+	[pca9530] = {
+		.num_leds = 2,
+	},
+	[pca9531] = {
+		.num_leds = 8,
+	},
+	[pca9532] = {
+		.num_leds = 16,
+	},
+	[pca9533] = {
+		.num_leds = 4,
+	},
+};
+
+static struct i2c_driver pca9532_driver = {
+	.driver = {
+		.name = "leds-pca953x",
+	},
+	.probe = pca9532_probe,
+	.remove = pca9532_remove,
+	.id_table = pca9532_id,
+};
+
+/* We have two pwm/blinkers, but 16 possible leds to drive. Additionally,
+ * the clever Thecus people are using one pwm to drive the beeper. So,
+ * as a compromise we average one pwm to the values requested by all
+ * leds that are not ON/OFF.
+ * */
+static int pca9532_calcpwm(struct i2c_client *client, int pwm, int blink,
+	enum led_brightness value)
+{
+	int a = 0, b = 0, i = 0;
+	struct pca9532_data *data = i2c_get_clientdata(client);
+	for (i = 0; i < data->chip_info->num_leds; i++) {
+		if (data->leds[i].type == PCA9532_TYPE_LED &&
+			data->leds[i].state == PCA9532_PWM0+pwm) {
+				a++;
+				b += data->leds[i].ldev.brightness;
+		}
+	}
+	if (a == 0) {
+		dev_err(&client->dev,
+		"fear of division by zero %d/%d, wanted %d\n",
+			b, a, value);
+		return -EINVAL;
+	}
+	b = b/a;
+	if (b > 0xFF)
+		return -EINVAL;
+	data->pwm[pwm] = b;
+	data->psc[pwm] = blink;
+	return 0;
+}
+
+static int pca9532_setpwm(struct i2c_client *client, int pwm)
+{
+	struct pca9532_data *data = i2c_get_clientdata(client);
+	u8 maxleds = data->chip_info->num_leds;
+
+	mutex_lock(&data->update_lock);
+	i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, pwm),
+		data->pwm[pwm]);
+	i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, pwm),
+		data->psc[pwm]);
+	mutex_unlock(&data->update_lock);
+	return 0;
+}
+
+/* Set LED routing */
+static void pca9532_setled(struct pca9532_led *led)
+{
+	struct i2c_client *client = led->client;
+	struct pca9532_data *data = i2c_get_clientdata(client);
+	u8 maxleds = data->chip_info->num_leds;
+	char reg;
+
+	mutex_lock(&data->update_lock);
+	reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
+	/* zero led bits */
+	reg = reg & ~(0x3<<LED_NUM(led->id)*2);
+	/* set the new value */
+	reg = reg | (led->state << LED_NUM(led->id)*2);
+	i2c_smbus_write_byte_data(client, LED_REG(maxleds, led->id), reg);
+	mutex_unlock(&data->update_lock);
+}
+
+static void pca9532_set_brightness(struct led_classdev *led_cdev,
+	enum led_brightness value)
+{
+	int err = 0;
+	struct pca9532_led *led = ldev_to_led(led_cdev);
+
+	if (value == LED_OFF)
+		led->state = PCA9532_OFF;
+	else if (value == LED_FULL)
+		led->state = PCA9532_ON;
+	else {
+		led->state = PCA9532_PWM0; /* Thecus: hardcode one pwm */
+		err = pca9532_calcpwm(led->client, 0, 0, value);
+		if (err)
+			return; /* XXX: led api doesn't allow error code? */
+	}
+	schedule_work(&led->work);
+}
+
+static int pca9532_set_blink(struct led_classdev *led_cdev,
+	unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct pca9532_led *led = ldev_to_led(led_cdev);
+	struct i2c_client *client = led->client;
+	int psc;
+	int err = 0;
+
+	if (*delay_on == 0 && *delay_off == 0) {
+		/* led subsystem ask us for a blink rate */
+		*delay_on = 1000;
+		*delay_off = 1000;
+	}
+	if (*delay_on != *delay_off || *delay_on > 1690 || *delay_on < 6)
+		return -EINVAL;
+
+	/* Thecus specific: only use PSC/PWM 0 */
+	psc = (*delay_on * 152-1)/1000;
+	err = pca9532_calcpwm(client, 0, psc, led_cdev->brightness);
+	if (err)
+		return err;
+	schedule_work(&led->work);
+	return 0;
+}
+
+static int pca9532_event(struct input_dev *dev, unsigned int type,
+	unsigned int code, int value)
+{
+	struct pca9532_data *data = input_get_drvdata(dev);
+
+	if (!(type == EV_SND && (code == SND_BELL || code == SND_TONE)))
+		return -1;
+
+	/* XXX: allow different kind of beeps with psc/pwm modifications */
+	if (value > 1 && value < 32767)
+		data->pwm[1] = 127;
+	else
+		data->pwm[1] = 0;
+
+	schedule_work(&data->work);
+
+	return 0;
+}
+
+static void pca9532_input_work(struct work_struct *work)
+{
+	struct pca9532_data *data =
+		container_of(work, struct pca9532_data, work);
+	u8 maxleds = data->chip_info->num_leds;
+
+	mutex_lock(&data->update_lock);
+	i2c_smbus_write_byte_data(data->client, PCA9532_REG_PWM(maxleds, 1),
+		data->pwm[1]);
+	mutex_unlock(&data->update_lock);
+}
+
+static void pca9532_led_work(struct work_struct *work)
+{
+	struct pca9532_led *led;
+	led = container_of(work, struct pca9532_led, work);
+	if (led->state == PCA9532_PWM0)
+		pca9532_setpwm(led->client, 0);
+	pca9532_setled(led);
+}
+
+#ifdef CONFIG_LEDS_PCA9532_GPIO
+static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
+{
+	struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
+	struct pca9532_led *led = &data->leds[offset];
+
+	if (led->type == PCA9532_TYPE_GPIO)
+		return 0;
+
+	return -EBUSY;
+}
+
+static void pca9532_gpio_set_value(struct gpio_chip *gc, unsigned offset, int val)
+{
+	struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
+	struct pca9532_led *led = &data->leds[offset];
+
+	if (val)
+		led->state = PCA9532_ON;
+	else
+		led->state = PCA9532_OFF;
+
+	pca9532_setled(led);
+}
+
+static int pca9532_gpio_get_value(struct gpio_chip *gc, unsigned offset)
+{
+	struct pca9532_data *data = container_of(gc, struct pca9532_data, gpio);
+	unsigned char reg;
+
+	reg = i2c_smbus_read_byte_data(data->client, PCA9532_REG_INPUT(offset));
+
+	return !!(reg & (1 << (offset % 8)));
+}
+
+static int pca9532_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+	/* To use as input ensure pin is not driven */
+	pca9532_gpio_set_value(gc, offset, 0);
+
+	return 0;
+}
+
+static int pca9532_gpio_direction_output(struct gpio_chip *gc, unsigned offset, int val)
+{
+	pca9532_gpio_set_value(gc, offset, val);
+
+	return 0;
+}
+#endif /* CONFIG_LEDS_PCA9532_GPIO */
+
+static int pca9532_destroy_devices(struct pca9532_data *data, int n_devs)
+{
+	int i = n_devs;
+
+	if (!data)
+		return -EINVAL;
+
+	while (--i >= 0) {
+		switch (data->leds[i].type) {
+		case PCA9532_TYPE_NONE:
+		case PCA9532_TYPE_GPIO:
+			break;
+		case PCA9532_TYPE_LED:
+			led_classdev_unregister(&data->leds[i].ldev);
+			cancel_work_sync(&data->leds[i].work);
+			break;
+		case PCA9532_TYPE_N2100_BEEP:
+			if (data->idev != NULL) {
+				cancel_work_sync(&data->work);
+				data->idev = NULL;
+			}
+			break;
+		}
+	}
+
+#ifdef CONFIG_LEDS_PCA9532_GPIO
+	if (data->gpio.dev)
+		gpiochip_remove(&data->gpio);
+#endif
+
+	return 0;
+}
+
+static int pca9532_configure(struct i2c_client *client,
+	struct pca9532_data *data, struct pca9532_platform_data *pdata)
+{
+	int i, err = 0;
+	int gpios = 0;
+	u8 maxleds = data->chip_info->num_leds;
+
+	for (i = 0; i < 2; i++)	{
+		data->pwm[i] = pdata->pwm[i];
+		data->psc[i] = pdata->psc[i];
+		i2c_smbus_write_byte_data(client, PCA9532_REG_PWM(maxleds, i),
+			data->pwm[i]);
+		i2c_smbus_write_byte_data(client, PCA9532_REG_PSC(maxleds, i),
+			data->psc[i]);
+	}
+
+	for (i = 0; i < data->chip_info->num_leds; i++) {
+		struct pca9532_led *led = &data->leds[i];
+		struct pca9532_led *pled = &pdata->leds[i];
+		led->client = client;
+		led->id = i;
+		led->type = pled->type;
+		switch (led->type) {
+		case PCA9532_TYPE_NONE:
+			break;
+		case PCA9532_TYPE_GPIO:
+			gpios++;
+			break;
+		case PCA9532_TYPE_LED:
+			led->state = pled->state;
+			led->name = pled->name;
+			led->ldev.name = led->name;
+			led->ldev.brightness = LED_OFF;
+			led->ldev.brightness_set = pca9532_set_brightness;
+			led->ldev.blink_set = pca9532_set_blink;
+			INIT_WORK(&led->work, pca9532_led_work);
+			err = led_classdev_register(&client->dev, &led->ldev);
+			if (err < 0) {
+				dev_err(&client->dev,
+					"couldn't register LED %s\n",
+					led->name);
+				goto exit;
+			}
+			pca9532_setled(led);
+			break;
+		case PCA9532_TYPE_N2100_BEEP:
+			BUG_ON(data->idev);
+			led->state = PCA9532_PWM1;
+			pca9532_setled(led);
+			data->idev = devm_input_allocate_device(&client->dev);
+			if (data->idev == NULL) {
+				err = -ENOMEM;
+				goto exit;
+			}
+			data->idev->name = pled->name;
+			data->idev->phys = "i2c/pca9532";
+			data->idev->id.bustype = BUS_HOST;
+			data->idev->id.vendor = 0x001f;
+			data->idev->id.product = 0x0001;
+			data->idev->id.version = 0x0100;
+			data->idev->evbit[0] = BIT_MASK(EV_SND);
+			data->idev->sndbit[0] = BIT_MASK(SND_BELL) |
+						BIT_MASK(SND_TONE);
+			data->idev->event = pca9532_event;
+			input_set_drvdata(data->idev, data);
+			INIT_WORK(&data->work, pca9532_input_work);
+			err = input_register_device(data->idev);
+			if (err) {
+				cancel_work_sync(&data->work);
+				data->idev = NULL;
+				goto exit;
+			}
+			break;
+		}
+	}
+
+#ifdef CONFIG_LEDS_PCA9532_GPIO
+	if (gpios) {
+		data->gpio.label = "gpio-pca9532";
+		data->gpio.direction_input = pca9532_gpio_direction_input;
+		data->gpio.direction_output = pca9532_gpio_direction_output;
+		data->gpio.set = pca9532_gpio_set_value;
+		data->gpio.get = pca9532_gpio_get_value;
+		data->gpio.request = pca9532_gpio_request_pin;
+		data->gpio.can_sleep = 1;
+		data->gpio.base = pdata->gpio_base;
+		data->gpio.ngpio = data->chip_info->num_leds;
+		data->gpio.dev = &client->dev;
+		data->gpio.owner = THIS_MODULE;
+
+		err = gpiochip_add(&data->gpio);
+		if (err) {
+			/* Use data->gpio.dev as a flag for freeing gpiochip */
+			data->gpio.dev = NULL;
+			dev_warn(&client->dev, "could not add gpiochip\n");
+		} else {
+			dev_info(&client->dev, "gpios %i...%i\n",
+				data->gpio.base, data->gpio.base +
+				data->gpio.ngpio - 1);
+		}
+	}
+#endif
+
+	return 0;
+
+exit:
+	pca9532_destroy_devices(data, i);
+	return err;
+}
+
+static int pca9532_probe(struct i2c_client *client,
+	const struct i2c_device_id *id)
+{
+	struct pca9532_data *data = i2c_get_clientdata(client);
+	struct pca9532_platform_data *pca9532_pdata =
+			dev_get_platdata(&client->dev);
+
+	if (!pca9532_pdata)
+		return -EIO;
+
+	if (!i2c_check_functionality(client->adapter,
+		I2C_FUNC_SMBUS_BYTE_DATA))
+		return -EIO;
+
+	data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->chip_info = &pca9532_chip_info_tbl[id->driver_data];
+
+	dev_info(&client->dev, "setting platform data\n");
+	i2c_set_clientdata(client, data);
+	data->client = client;
+	mutex_init(&data->update_lock);
+
+	return pca9532_configure(client, data, pca9532_pdata);
+}
+
+static int pca9532_remove(struct i2c_client *client)
+{
+	struct pca9532_data *data = i2c_get_clientdata(client);
+	int err;
+
+	err = pca9532_destroy_devices(data, data->chip_info->num_leds);
+	if (err)
+		return err;
+
+	return 0;
+}
+
+module_i2c_driver(pca9532_driver);
+
+MODULE_AUTHOR("Riku Voipio");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PCA 9532 LED dimmer");

drivers/leds/leds-pca955x.c

@@ -0,0 +1,393 @@
+/*
+ * Copyright 2007-2008 Extreme Engineering Solutions, Inc.
+ *
+ * Author: Nate Case <ncase@xes-inc.com>
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License.  See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * LED driver for various PCA955x I2C LED drivers
+ *
+ * Supported devices:
+ *
+ *	Device		Description		7-bit slave address
+ *	------		-----------		-------------------
+ *	PCA9550		2-bit driver		0x60 .. 0x61
+ *	PCA9551		8-bit driver		0x60 .. 0x67
+ *	PCA9552		16-bit driver		0x60 .. 0x67
+ *	PCA9553/01	4-bit driver		0x62
+ *	PCA9553/02	4-bit driver		0x63
+ *
+ * Philips PCA955x LED driver chips follow a register map as shown below:
+ *
+ *	Control Register		Description
+ *	----------------		-----------
+ *	0x0				Input register 0
+ *					..
+ *	NUM_INPUT_REGS - 1		Last Input register X
+ *
+ *	NUM_INPUT_REGS			Frequency prescaler 0
+ *	NUM_INPUT_REGS + 1		PWM register 0
+ *	NUM_INPUT_REGS + 2		Frequency prescaler 1
+ *	NUM_INPUT_REGS + 3		PWM register 1
+ *
+ *	NUM_INPUT_REGS + 4		LED selector 0
+ *	NUM_INPUT_REGS + 4
+ *	    + NUM_LED_REGS - 1		Last LED selector
+ *
+ *  where NUM_INPUT_REGS and NUM_LED_REGS vary depending on how many
+ *  bits the chip supports.
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+
+/* LED select registers determine the source that drives LED outputs */
+#define PCA955X_LS_LED_ON	0x0	/* Output LOW */
+#define PCA955X_LS_LED_OFF	0x1	/* Output HI-Z */
+#define PCA955X_LS_BLINK0	0x2	/* Blink at PWM0 rate */
+#define PCA955X_LS_BLINK1	0x3	/* Blink at PWM1 rate */
+
+enum pca955x_type {
+	pca9550,
+	pca9551,
+	pca9552,
+	pca9553,
+};
+
+struct pca955x_chipdef {
+	int			bits;
+	u8			slv_addr;	/* 7-bit slave address mask */
+	int			slv_addr_shift;	/* Number of bits to ignore */
+};
+
+static struct pca955x_chipdef pca955x_chipdefs[] = {
+	[pca9550] = {
+		.bits		= 2,
+		.slv_addr	= /* 110000x */ 0x60,
+		.slv_addr_shift	= 1,
+	},
+	[pca9551] = {
+		.bits		= 8,
+		.slv_addr	= /* 1100xxx */ 0x60,
+		.slv_addr_shift	= 3,
+	},
+	[pca9552] = {
+		.bits		= 16,
+		.slv_addr	= /* 1100xxx */ 0x60,
+		.slv_addr_shift	= 3,
+	},
+	[pca9553] = {
+		.bits		= 4,
+		.slv_addr	= /* 110001x */ 0x62,
+		.slv_addr_shift	= 1,
+	},
+};
+
+static const struct i2c_device_id pca955x_id[] = {
+	{ "pca9550", pca9550 },
+	{ "pca9551", pca9551 },
+	{ "pca9552", pca9552 },
+	{ "pca9553", pca9553 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, pca955x_id);
+
+struct pca955x {
+	struct mutex lock;
+	struct pca955x_led *leds;
+	struct pca955x_chipdef	*chipdef;
+	struct i2c_client	*client;
+};
+
+struct pca955x_led {
+	struct pca955x	*pca955x;
+	struct work_struct	work;
+	enum led_brightness	brightness;
+	struct led_classdev	led_cdev;
+	int			led_num;	/* 0 .. 15 potentially */
+	char			name[32];
+};
+
+/* 8 bits per input register */
+static inline int pca95xx_num_input_regs(int bits)
+{
+	return (bits + 7) / 8;
+}
+
+/* 4 bits per LED selector register */
+static inline int pca95xx_num_led_regs(int bits)
+{
+	return (bits + 3)  / 4;
+}
+
+/*
+ * Return an LED selector register value based on an existing one, with
+ * the appropriate 2-bit state value set for the given LED number (0-3).
+ */
+static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
+{
+	return (oldval & (~(0x3 << (led_num << 1)))) |
+		((state & 0x3) << (led_num << 1));
+}
+
+/*
+ * Write to frequency prescaler register, used to program the
+ * period of the PWM output.  period = (PSCx + 1) / 38
+ */
+static void pca955x_write_psc(struct i2c_client *client, int n, u8 val)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+
+	i2c_smbus_write_byte_data(client,
+		pca95xx_num_input_regs(pca955x->chipdef->bits) + 2*n,
+		val);
+}
+
+/*
+ * Write to PWM register, which determines the duty cycle of the
+ * output.  LED is OFF when the count is less than the value of this
+ * register, and ON when it is greater.  If PWMx == 0, LED is always OFF.
+ *
+ * Duty cycle is (256 - PWMx) / 256
+ */
+static void pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+
+	i2c_smbus_write_byte_data(client,
+		pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + 2*n,
+		val);
+}
+
+/*
+ * Write to LED selector register, which determines the source that
+ * drives the LED output.
+ */
+static void pca955x_write_ls(struct i2c_client *client, int n, u8 val)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+
+	i2c_smbus_write_byte_data(client,
+		pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n,
+		val);
+}
+
+/*
+ * Read the LED selector register, which determines the source that
+ * drives the LED output.
+ */
+static u8 pca955x_read_ls(struct i2c_client *client, int n)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+
+	return (u8) i2c_smbus_read_byte_data(client,
+		pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n);
+}
+
+static void pca955x_led_work(struct work_struct *work)
+{
+	struct pca955x_led *pca955x_led;
+	struct pca955x *pca955x;
+	u8 ls;
+	int chip_ls;	/* which LSx to use (0-3 potentially) */
+	int ls_led;	/* which set of bits within LSx to use (0-3) */
+
+	pca955x_led = container_of(work, struct pca955x_led, work);
+	pca955x = pca955x_led->pca955x;
+
+	chip_ls = pca955x_led->led_num / 4;
+	ls_led = pca955x_led->led_num % 4;
+
+	mutex_lock(&pca955x->lock);
+
+	ls = pca955x_read_ls(pca955x->client, chip_ls);
+
+	switch (pca955x_led->brightness) {
+	case LED_FULL:
+		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
+		break;
+	case LED_OFF:
+		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
+		break;
+	case LED_HALF:
+		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
+		break;
+	default:
+		/*
+		 * Use PWM1 for all other values.  This has the unwanted
+		 * side effect of making all LEDs on the chip share the
+		 * same brightness level if set to a value other than
+		 * OFF, HALF, or FULL.  But, this is probably better than
+		 * just turning off for all other values.
+		 */
+		pca955x_write_pwm(pca955x->client, 1,
+				255 - pca955x_led->brightness);
+		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
+		break;
+	}
+
+	pca955x_write_ls(pca955x->client, chip_ls, ls);
+
+	mutex_unlock(&pca955x->lock);
+}
+
+static void pca955x_led_set(struct led_classdev *led_cdev, enum led_brightness value)
+{
+	struct pca955x_led *pca955x;
+
+	pca955x = container_of(led_cdev, struct pca955x_led, led_cdev);
+
+	pca955x->brightness = value;
+
+	/*
+	 * Must use workqueue for the actual I/O since I2C operations
+	 * can sleep.
+	 */
+	schedule_work(&pca955x->work);
+}
+
+static int pca955x_probe(struct i2c_client *client,
+					const struct i2c_device_id *id)
+{
+	struct pca955x *pca955x;
+	struct pca955x_led *pca955x_led;
+	struct pca955x_chipdef *chip;
+	struct i2c_adapter *adapter;
+	struct led_platform_data *pdata;
+	int i, err;
+
+	chip = &pca955x_chipdefs[id->driver_data];
+	adapter = to_i2c_adapter(client->dev.parent);
+	pdata = dev_get_platdata(&client->dev);
+
+	/* Make sure the slave address / chip type combo given is possible */
+	if ((client->addr & ~((1 << chip->slv_addr_shift) - 1)) !=
+	    chip->slv_addr) {
+		dev_err(&client->dev, "invalid slave address %02x\n",
+				client->addr);
+		return -ENODEV;
+	}
+
+	dev_info(&client->dev, "leds-pca955x: Using %s %d-bit LED driver at "
+			"slave address 0x%02x\n",
+			id->name, chip->bits, client->addr);
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
+		return -EIO;
+
+	if (pdata) {
+		if (pdata->num_leds != chip->bits) {
+			dev_err(&client->dev, "board info claims %d LEDs"
+					" on a %d-bit chip\n",
+					pdata->num_leds, chip->bits);
+			return -ENODEV;
+		}
+	}
+
+	pca955x = devm_kzalloc(&client->dev, sizeof(*pca955x), GFP_KERNEL);
+	if (!pca955x)
+		return -ENOMEM;
+
+	pca955x->leds = devm_kzalloc(&client->dev,
+			sizeof(*pca955x_led) * chip->bits, GFP_KERNEL);
+	if (!pca955x->leds)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, pca955x);
+
+	mutex_init(&pca955x->lock);
+	pca955x->client = client;
+	pca955x->chipdef = chip;
+
+	for (i = 0; i < chip->bits; i++) {
+		pca955x_led = &pca955x->leds[i];
+		pca955x_led->led_num = i;
+		pca955x_led->pca955x = pca955x;
+
+		/* Platform data can specify LED names and default triggers */
+		if (pdata) {
+			if (pdata->leds[i].name)
+				snprintf(pca955x_led->name,
+					sizeof(pca955x_led->name), "pca955x:%s",
+					pdata->leds[i].name);
+			if (pdata->leds[i].default_trigger)
+				pca955x_led->led_cdev.default_trigger =
+					pdata->leds[i].default_trigger;
+		} else {
+			snprintf(pca955x_led->name, sizeof(pca955x_led->name),
+				 "pca955x:%d", i);
+		}
+
+		pca955x_led->led_cdev.name = pca955x_led->name;
+		pca955x_led->led_cdev.brightness_set = pca955x_led_set;
+
+		INIT_WORK(&pca955x_led->work, pca955x_led_work);
+
+		err = led_classdev_register(&client->dev,
+					&pca955x_led->led_cdev);
+		if (err < 0)
+			goto exit;
+	}
+
+	/* Turn off LEDs */
+	for (i = 0; i < pca95xx_num_led_regs(chip->bits); i++)
+		pca955x_write_ls(client, i, 0x55);
+
+	/* PWM0 is used for half brightness or 50% duty cycle */
+	pca955x_write_pwm(client, 0, 255-LED_HALF);
+
+	/* PWM1 is used for variable brightness, default to OFF */
+	pca955x_write_pwm(client, 1, 0);
+
+	/* Set to fast frequency so we do not see flashing */
+	pca955x_write_psc(client, 0, 0);
+	pca955x_write_psc(client, 1, 0);
+
+	return 0;
+
+exit:
+	while (i--) {
+		led_classdev_unregister(&pca955x->leds[i].led_cdev);
+		cancel_work_sync(&pca955x->leds[i].work);
+	}
+
+	return err;
+}
+
+static int pca955x_remove(struct i2c_client *client)
+{
+	struct pca955x *pca955x = i2c_get_clientdata(client);
+	int i;
+
+	for (i = 0; i < pca955x->chipdef->bits; i++) {
+		led_classdev_unregister(&pca955x->leds[i].led_cdev);
+		cancel_work_sync(&pca955x->leds[i].work);
+	}
+
+	return 0;
+}
+
+static struct i2c_driver pca955x_driver = {
+	.driver = {
+		.name	= "leds-pca955x",
+		.owner	= THIS_MODULE,
+	},
+	.probe	= pca955x_probe,
+	.remove	= pca955x_remove,
+	.id_table = pca955x_id,
+};
+
+module_i2c_driver(pca955x_driver);
+
+MODULE_AUTHOR("Nate Case <ncase@xes-inc.com>");
+MODULE_DESCRIPTION("PCA955x LED driver");
+MODULE_LICENSE("GPL v2");

drivers/leds/leds-pca963x.c

@@ -0,0 +1,473 @@
+/*
+ * Copyright 2011 bct electronic GmbH
+ * Copyright 2013 Qtechnology/AS
+ *
+ * Author: Peter Meerwald <p.meerwald@bct-electronic.com>
+ * Author: Ricardo Ribalda <ricardo.ribalda@gmail.com>
+ *
+ * Based on leds-pca955x.c
+ *
+ * This file is subject to the terms and conditions of version 2 of
+ * the GNU General Public License.  See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ * LED driver for the PCA9633 I2C LED driver (7-bit slave address 0x62)
+ * LED driver for the PCA9634/5 I2C LED driver (7-bit slave address set by hw.)
+ *
+ * Note that hardware blinking violates the leds infrastructure driver
+ * interface since the hardware only supports blinking all LEDs with the
+ * same delay_on/delay_off rates.  That is, only the LEDs that are set to
+ * blink will actually blink but all LEDs that are set to blink will blink
+ * in identical fashion.  The delay_on/delay_off values of the last LED
+ * that is set to blink will be used for all of the blinking LEDs.
+ * Hardware blinking is disabled by default but can be enabled by setting
+ * the 'blink_type' member in the platform_data struct to 'PCA963X_HW_BLINK'
+ * or by adding the 'nxp,hw-blink' property to the DTS.
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/workqueue.h>
+#include <linux/slab.h>
+#include <linux/of.h>
+#include <linux/platform_data/leds-pca963x.h>
+
+/* LED select registers determine the source that drives LED outputs */
+#define PCA963X_LED_OFF		0x0	/* LED driver off */
+#define PCA963X_LED_ON		0x1	/* LED driver on */
+#define PCA963X_LED_PWM		0x2	/* Controlled through PWM */
+#define PCA963X_LED_GRP_PWM	0x3	/* Controlled through PWM/GRPPWM */
+
+#define PCA963X_MODE2_DMBLNK	0x20	/* Enable blinking */
+
+#define PCA963X_MODE1		0x00
+#define PCA963X_MODE2		0x01
+#define PCA963X_PWM_BASE	0x02
+
+enum pca963x_type {
+	pca9633,
+	pca9634,
+	pca9635,
+};
+
+struct pca963x_chipdef {
+	u8			grppwm;
+	u8			grpfreq;
+	u8			ledout_base;
+	int			n_leds;
+};
+
+static struct pca963x_chipdef pca963x_chipdefs[] = {
+	[pca9633] = {
+		.grppwm		= 0x6,
+		.grpfreq	= 0x7,
+		.ledout_base	= 0x8,
+		.n_leds		= 4,
+	},
+	[pca9634] = {
+		.grppwm		= 0xa,
+		.grpfreq	= 0xb,
+		.ledout_base	= 0xc,
+		.n_leds		= 8,
+	},
+	[pca9635] = {
+		.grppwm		= 0x12,
+		.grpfreq	= 0x13,
+		.ledout_base	= 0x14,
+		.n_leds		= 16,
+	},
+};
+
+/* Total blink period in milliseconds */
+#define PCA963X_BLINK_PERIOD_MIN	42
+#define PCA963X_BLINK_PERIOD_MAX	10667
+
+static const struct i2c_device_id pca963x_id[] = {
+	{ "pca9632", pca9633 },
+	{ "pca9633", pca9633 },
+	{ "pca9634", pca9634 },
+	{ "pca9635", pca9635 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, pca963x_id);
+
+enum pca963x_cmd {
+	BRIGHTNESS_SET,
+	BLINK_SET,
+};
+
+struct pca963x_led;
+
+struct pca963x {
+	struct pca963x_chipdef *chipdef;
+	struct mutex mutex;
+	struct i2c_client *client;
+	struct pca963x_led *leds;
+};
+
+struct pca963x_led {
+	struct pca963x *chip;
+	struct work_struct work;
+	enum led_brightness brightness;
+	struct led_classdev led_cdev;
+	int led_num; /* 0 .. 15 potentially */
+	enum pca963x_cmd cmd;
+	char name[32];
+	u8 gdc;
+	u8 gfrq;
+};
+
+static void pca963x_brightness_work(struct pca963x_led *pca963x)
+{
+	u8 ledout_addr = pca963x->chip->chipdef->ledout_base
+		+ (pca963x->led_num / 4);
+	u8 ledout;
+	int shift = 2 * (pca963x->led_num % 4);
+	u8 mask = 0x3 << shift;
+
+	mutex_lock(&pca963x->chip->mutex);
+	ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
+	switch (pca963x->brightness) {
+	case LED_FULL:
+		i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
+			(ledout & ~mask) | (PCA963X_LED_ON << shift));
+		break;
+	case LED_OFF:
+		i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
+			ledout & ~mask);
+		break;
+	default:
+		i2c_smbus_write_byte_data(pca963x->chip->client,
+			PCA963X_PWM_BASE + pca963x->led_num,
+			pca963x->brightness);
+		i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
+			(ledout & ~mask) | (PCA963X_LED_PWM << shift));
+		break;
+	}
+	mutex_unlock(&pca963x->chip->mutex);
+}
+
+static void pca963x_blink_work(struct pca963x_led *pca963x)
+{
+	u8 ledout_addr = pca963x->chip->chipdef->ledout_base +
+		(pca963x->led_num / 4);
+	u8 ledout;
+	u8 mode2 = i2c_smbus_read_byte_data(pca963x->chip->client,
+							PCA963X_MODE2);
+	int shift = 2 * (pca963x->led_num % 4);
+	u8 mask = 0x3 << shift;
+
+	i2c_smbus_write_byte_data(pca963x->chip->client,
+			pca963x->chip->chipdef->grppwm,	pca963x->gdc);
+
+	i2c_smbus_write_byte_data(pca963x->chip->client,
+			pca963x->chip->chipdef->grpfreq, pca963x->gfrq);
+
+	if (!(mode2 & PCA963X_MODE2_DMBLNK))
+		i2c_smbus_write_byte_data(pca963x->chip->client, PCA963X_MODE2,
+			mode2 | PCA963X_MODE2_DMBLNK);
+
+	mutex_lock(&pca963x->chip->mutex);
+	ledout = i2c_smbus_read_byte_data(pca963x->chip->client, ledout_addr);
+	if ((ledout & mask) != (PCA963X_LED_GRP_PWM << shift))
+		i2c_smbus_write_byte_data(pca963x->chip->client, ledout_addr,
+			(ledout & ~mask) | (PCA963X_LED_GRP_PWM << shift));
+	mutex_unlock(&pca963x->chip->mutex);
+}
+
+static void pca963x_work(struct work_struct *work)
+{
+	struct pca963x_led *pca963x = container_of(work,
+		struct pca963x_led, work);
+
+	switch (pca963x->cmd) {
+	case BRIGHTNESS_SET:
+		pca963x_brightness_work(pca963x);
+		break;
+	case BLINK_SET:
+		pca963x_blink_work(pca963x);
+		break;
+	}
+}
+
+static void pca963x_led_set(struct led_classdev *led_cdev,
+	enum led_brightness value)
+{
+	struct pca963x_led *pca963x;
+
+	pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);
+
+	pca963x->cmd = BRIGHTNESS_SET;
+	pca963x->brightness = value;
+
+	/*
+	 * Must use workqueue for the actual I/O since I2C operations
+	 * can sleep.
+	 */
+	schedule_work(&pca963x->work);
+}
+
+static int pca963x_blink_set(struct led_classdev *led_cdev,
+		unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct pca963x_led *pca963x;
+	unsigned long time_on, time_off, period;
+	u8 gdc, gfrq;
+
+	pca963x = container_of(led_cdev, struct pca963x_led, led_cdev);
+
+	time_on = *delay_on;
+	time_off = *delay_off;
+
+	/* If both zero, pick reasonable defaults of 500ms each */
+	if (!time_on && !time_off) {
+		time_on = 500;
+		time_off = 500;
+	}
+
+	period = time_on + time_off;
+
+	/* If period not supported by hardware, default to someting sane. */
+	if ((period < PCA963X_BLINK_PERIOD_MIN) ||
+	    (period > PCA963X_BLINK_PERIOD_MAX)) {
+		time_on = 500;
+		time_off = 500;
+		period = time_on + time_off;
+	}
+
+	/*
+	 * From manual: duty cycle = (GDC / 256) ->
+	 *	(time_on / period) = (GDC / 256) ->
+	 *		GDC = ((time_on * 256) / period)
+	 */
+	gdc = (time_on * 256) / period;
+
+	/*
+	 * From manual: period = ((GFRQ + 1) / 24) in seconds.
+	 * So, period (in ms) = (((GFRQ + 1) / 24) * 1000) ->
+	 *		GFRQ = ((period * 24 / 1000) - 1)
+	 */
+	gfrq = (period * 24 / 1000) - 1;
+
+	pca963x->cmd = BLINK_SET;
+	pca963x->gdc = gdc;
+	pca963x->gfrq = gfrq;
+
+	/*
+	 * Must use workqueue for the actual I/O since I2C operations
+	 * can sleep.
+	 */
+	schedule_work(&pca963x->work);
+
+	*delay_on = time_on;
+	*delay_off = time_off;
+
+	return 0;
+}
+
+#if IS_ENABLED(CONFIG_OF)
+static struct pca963x_platform_data *
+pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
+{
+	struct device_node *np = client->dev.of_node, *child;
+	struct pca963x_platform_data *pdata;
+	struct led_info *pca963x_leds;
+	int count;
+
+	count = of_get_child_count(np);
+	if (!count || count > chip->n_leds)
+		return ERR_PTR(-ENODEV);
+
+	pca963x_leds = devm_kzalloc(&client->dev,
+			sizeof(struct led_info) * chip->n_leds, GFP_KERNEL);
+	if (!pca963x_leds)
+		return ERR_PTR(-ENOMEM);
+
+	for_each_child_of_node(np, child) {
+		struct led_info led;
+		u32 reg;
+		int res;
+
+		res = of_property_read_u32(child, "reg", &reg);
+		if ((res != 0) || (reg >= chip->n_leds))
+			continue;
+		led.name =
+			of_get_property(child, "label", NULL) ? : child->name;
+		led.default_trigger =
+			of_get_property(child, "linux,default-trigger", NULL);
+		pca963x_leds[reg] = led;
+	}
+	pdata = devm_kzalloc(&client->dev,
+			     sizeof(struct pca963x_platform_data), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	pdata->leds.leds = pca963x_leds;
+	pdata->leds.num_leds = chip->n_leds;
+
+	/* default to open-drain unless totem pole (push-pull) is specified */
+	if (of_property_read_bool(np, "nxp,totem-pole"))
+		pdata->outdrv = PCA963X_TOTEM_POLE;
+	else
+		pdata->outdrv = PCA963X_OPEN_DRAIN;
+
+	/* default to software blinking unless hardware blinking is specified */
+	if (of_property_read_bool(np, "nxp,hw-blink"))
+		pdata->blink_type = PCA963X_HW_BLINK;
+	else
+		pdata->blink_type = PCA963X_SW_BLINK;
+
+	return pdata;
+}
+
+static const struct of_device_id of_pca963x_match[] = {
+	{ .compatible = "nxp,pca9632", },
+	{ .compatible = "nxp,pca9633", },
+	{ .compatible = "nxp,pca9634", },
+	{ .compatible = "nxp,pca9635", },
+	{},
+};
+#else
+static struct pca963x_platform_data *
+pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
+{
+	return ERR_PTR(-ENODEV);
+}
+#endif
+
+static int pca963x_probe(struct i2c_client *client,
+					const struct i2c_device_id *id)
+{
+	struct pca963x *pca963x_chip;
+	struct pca963x_led *pca963x;
+	struct pca963x_platform_data *pdata;
+	struct pca963x_chipdef *chip;
+	int i, err;
+
+	chip = &pca963x_chipdefs[id->driver_data];
+	pdata = dev_get_platdata(&client->dev);
+
+	if (!pdata) {
+		pdata = pca963x_dt_init(client, chip);
+		if (IS_ERR(pdata)) {
+			dev_warn(&client->dev, "could not parse configuration\n");
+			pdata = NULL;
+		}
+	}
+
+	if (pdata && (pdata->leds.num_leds < 1 ||
+				 pdata->leds.num_leds > chip->n_leds)) {
+		dev_err(&client->dev, "board info must claim 1-%d LEDs",
+								chip->n_leds);
+		return -EINVAL;
+	}
+
+	pca963x_chip = devm_kzalloc(&client->dev, sizeof(*pca963x_chip),
+								GFP_KERNEL);
+	if (!pca963x_chip)
+		return -ENOMEM;
+	pca963x = devm_kzalloc(&client->dev, chip->n_leds * sizeof(*pca963x),
+								GFP_KERNEL);
+	if (!pca963x)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, pca963x_chip);
+
+	mutex_init(&pca963x_chip->mutex);
+	pca963x_chip->chipdef = chip;
+	pca963x_chip->client = client;
+	pca963x_chip->leds = pca963x;
+
+	/* Turn off LEDs by default*/
+	for (i = 0; i < chip->n_leds / 4; i++)
+		i2c_smbus_write_byte_data(client, chip->ledout_base + i, 0x00);
+
+	for (i = 0; i < chip->n_leds; i++) {
+		pca963x[i].led_num = i;
+		pca963x[i].chip = pca963x_chip;
+
+		/* Platform data can specify LED names and default triggers */
+		if (pdata && i < pdata->leds.num_leds) {
+			if (pdata->leds.leds[i].name)
+				snprintf(pca963x[i].name,
+					 sizeof(pca963x[i].name), "pca963x:%s",
+					 pdata->leds.leds[i].name);
+			if (pdata->leds.leds[i].default_trigger)
+				pca963x[i].led_cdev.default_trigger =
+					pdata->leds.leds[i].default_trigger;
+		}
+		if (!pdata || i >= pdata->leds.num_leds ||
+						!pdata->leds.leds[i].name)
+			snprintf(pca963x[i].name, sizeof(pca963x[i].name),
+				 "pca963x:%d:%.2x:%d", client->adapter->nr,
+				 client->addr, i);
+
+		pca963x[i].led_cdev.name = pca963x[i].name;
+		pca963x[i].led_cdev.brightness_set = pca963x_led_set;
+
+		if (pdata && pdata->blink_type == PCA963X_HW_BLINK)
+			pca963x[i].led_cdev.blink_set = pca963x_blink_set;
+
+		INIT_WORK(&pca963x[i].work, pca963x_work);
+
+		err = led_classdev_register(&client->dev, &pca963x[i].led_cdev);
+		if (err < 0)
+			goto exit;
+	}
+
+	/* Disable LED all-call address and set normal mode */
+	i2c_smbus_write_byte_data(client, PCA963X_MODE1, 0x00);
+
+	if (pdata) {
+		/* Configure output: open-drain or totem pole (push-pull) */
+		if (pdata->outdrv == PCA963X_OPEN_DRAIN)
+			i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x01);
+		else
+			i2c_smbus_write_byte_data(client, PCA963X_MODE2, 0x05);
+	}
+
+	return 0;
+
+exit:
+	while (i--) {
+		led_classdev_unregister(&pca963x[i].led_cdev);
+		cancel_work_sync(&pca963x[i].work);
+	}
+
+	return err;
+}
+
+static int pca963x_remove(struct i2c_client *client)
+{
+	struct pca963x *pca963x = i2c_get_clientdata(client);
+	int i;
+
+	for (i = 0; i < pca963x->chipdef->n_leds; i++) {
+		led_classdev_unregister(&pca963x->leds[i].led_cdev);
+		cancel_work_sync(&pca963x->leds[i].work);
+	}
+
+	return 0;
+}
+
+static struct i2c_driver pca963x_driver = {
+	.driver = {
+		.name	= "leds-pca963x",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(of_pca963x_match),
+	},
+	.probe	= pca963x_probe,
+	.remove	= pca963x_remove,
+	.id_table = pca963x_id,
+};
+
+module_i2c_driver(pca963x_driver);
+
+MODULE_AUTHOR("Peter Meerwald <p.meerwald@bct-electronic.com>");
+MODULE_DESCRIPTION("PCA963X LED driver");
+MODULE_LICENSE("GPL v2");

drivers/leds/leds-pwm.c

@@ -0,0 +1,245 @@
+/*
+ * linux/drivers/leds-pwm.c
+ *
+ * simple PWM based LED control
+ *
+ * Copyright 2009 Luotao Fu @ Pengutronix (l.fu@pengutronix.de)
+ *
+ * based on leds-gpio.c by Raphael Assenat <raph@8d.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/of_platform.h>
+#include <linux/fb.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/pwm.h>
+#include <linux/leds_pwm.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+struct led_pwm_data {
+	struct led_classdev	cdev;
+	struct pwm_device	*pwm;
+	struct work_struct	work;
+	unsigned int		active_low;
+	unsigned int		period;
+	int			duty;
+	bool			can_sleep;
+};
+
+struct led_pwm_priv {
+	int num_leds;
+	struct led_pwm_data leds[0];
+};
+
+static void __led_pwm_set(struct led_pwm_data *led_dat)
+{
+	int new_duty = led_dat->duty;
+
+	pwm_config(led_dat->pwm, new_duty, led_dat->period);
+
+	if (new_duty == 0)
+		pwm_disable(led_dat->pwm);
+	else
+		pwm_enable(led_dat->pwm);
+}
+
+static void led_pwm_work(struct work_struct *work)
+{
+	struct led_pwm_data *led_dat =
+		container_of(work, struct led_pwm_data, work);
+
+	__led_pwm_set(led_dat);
+}
+
+static void led_pwm_set(struct led_classdev *led_cdev,
+	enum led_brightness brightness)
+{
+	struct led_pwm_data *led_dat =
+		container_of(led_cdev, struct led_pwm_data, cdev);
+	unsigned int max = led_dat->cdev.max_brightness;
+	unsigned long long duty =  led_dat->period;
+
+	duty *= brightness;
+	do_div(duty, max);
+
+	if (led_dat->active_low)
+		duty = led_dat->period - duty;
+
+	led_dat->duty = duty;
+
+	if (led_dat->can_sleep)
+		schedule_work(&led_dat->work);
+	else
+		__led_pwm_set(led_dat);
+}
+
+static inline size_t sizeof_pwm_leds_priv(int num_leds)
+{
+	return sizeof(struct led_pwm_priv) +
+		      (sizeof(struct led_pwm_data) * num_leds);
+}
+
+static void led_pwm_cleanup(struct led_pwm_priv *priv)
+{
+	while (priv->num_leds--) {
+		led_classdev_unregister(&priv->leds[priv->num_leds].cdev);
+		if (priv->leds[priv->num_leds].can_sleep)
+			cancel_work_sync(&priv->leds[priv->num_leds].work);
+	}
+}
+
+static int led_pwm_add(struct device *dev, struct led_pwm_priv *priv,
+		       struct led_pwm *led, struct device_node *child)
+{
+	struct led_pwm_data *led_data = &priv->leds[priv->num_leds];
+	int ret;
+
+	led_data->active_low = led->active_low;
+	led_data->cdev.name = led->name;
+	led_data->cdev.default_trigger = led->default_trigger;
+	led_data->cdev.brightness_set = led_pwm_set;
+	led_data->cdev.brightness = LED_OFF;
+	led_data->cdev.max_brightness = led->max_brightness;
+	led_data->cdev.flags = LED_CORE_SUSPENDRESUME;
+
+	if (child)
+		led_data->pwm = devm_of_pwm_get(dev, child, NULL);
+	else
+		led_data->pwm = devm_pwm_get(dev, led->name);
+	if (IS_ERR(led_data->pwm)) {
+		ret = PTR_ERR(led_data->pwm);
+		dev_err(dev, "unable to request PWM for %s: %d\n",
+			led->name, ret);
+		return ret;
+	}
+
+	if (child)
+		led_data->period = pwm_get_period(led_data->pwm);
+
+	led_data->can_sleep = pwm_can_sleep(led_data->pwm);
+	if (led_data->can_sleep)
+		INIT_WORK(&led_data->work, led_pwm_work);
+
+	led_data->period = pwm_get_period(led_data->pwm);
+	if (!led_data->period && (led->pwm_period_ns > 0))
+		led_data->period = led->pwm_period_ns;
+
+	ret = led_classdev_register(dev, &led_data->cdev);
+	if (ret == 0) {
+		priv->num_leds++;
+	} else {
+		dev_err(dev, "failed to register PWM led for %s: %d\n",
+			led->name, ret);
+	}
+
+	return ret;
+}
+
+static int led_pwm_create_of(struct device *dev, struct led_pwm_priv *priv)
+{
+	struct device_node *child;
+	struct led_pwm led;
+	int ret = 0;
+
+	memset(&led, 0, sizeof(led));
+
+	for_each_child_of_node(dev->of_node, child) {
+		led.name = of_get_property(child, "label", NULL) ? :
+			   child->name;
+
+		led.default_trigger = of_get_property(child,
+						"linux,default-trigger", NULL);
+		led.active_low = of_property_read_bool(child, "active-low");
+		of_property_read_u32(child, "max-brightness",
+				     &led.max_brightness);
+
+		ret = led_pwm_add(dev, priv, &led, child);
+		if (ret) {
+			of_node_put(child);
+			break;
+		}
+	}
+
+	return ret;
+}
+
+static int led_pwm_probe(struct platform_device *pdev)
+{
+	struct led_pwm_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct led_pwm_priv *priv;
+	int count, i;
+	int ret = 0;
+
+	if (pdata)
+		count = pdata->num_leds;
+	else
+		count = of_get_child_count(pdev->dev.of_node);
+
+	if (!count)
+		return -EINVAL;
+
+	priv = devm_kzalloc(&pdev->dev, sizeof_pwm_leds_priv(count),
+			    GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	if (pdata) {
+		for (i = 0; i < count; i++) {
+			ret = led_pwm_add(&pdev->dev, priv, &pdata->leds[i],
+					  NULL);
+			if (ret)
+				break;
+		}
+	} else {
+		ret = led_pwm_create_of(&pdev->dev, priv);
+	}
+
+	if (ret) {
+		led_pwm_cleanup(priv);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, priv);
+
+	return 0;
+}
+
+static int led_pwm_remove(struct platform_device *pdev)
+{
+	struct led_pwm_priv *priv = platform_get_drvdata(pdev);
+
+	led_pwm_cleanup(priv);
+
+	return 0;
+}
+
+static const struct of_device_id of_pwm_leds_match[] = {
+	{ .compatible = "pwm-leds", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, of_pwm_leds_match);
+
+static struct platform_driver led_pwm_driver = {
+	.probe		= led_pwm_probe,
+	.remove		= led_pwm_remove,
+	.driver		= {
+		.name	= "leds_pwm",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_pwm_leds_match,
+	},
+};
+
+module_platform_driver(led_pwm_driver);
+
+MODULE_AUTHOR("Luotao Fu <l.fu@pengutronix.de>");
+MODULE_DESCRIPTION("PWM LED driver for PXA");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-pwm");

drivers/leds/leds-rb532.c

@@ -0,0 +1,65 @@
+/*
+ * LEDs driver for the "User LED" on Routerboard532
+ *
+ * Copyright (C) 2009 Phil Sutter <n0-1@freewrt.org>
+ *
+ * Based on leds-cobalt-qube.c by Florian Fainelly and
+ * rb-diag.c (my own standalone driver for both LED and
+ * button of Routerboard532).
+ */
+
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-rc32434/gpio.h>
+#include <asm/mach-rc32434/rb.h>
+
+static void rb532_led_set(struct led_classdev *cdev,
+			  enum led_brightness brightness)
+{
+	if (brightness)
+		set_latch_u5(LO_ULED, 0);
+
+	else
+		set_latch_u5(0, LO_ULED);
+}
+
+static enum led_brightness rb532_led_get(struct led_classdev *cdev)
+{
+	return (get_latch_u5() & LO_ULED) ? LED_FULL : LED_OFF;
+}
+
+static struct led_classdev rb532_uled = {
+	.name = "uled",
+	.brightness_set = rb532_led_set,
+	.brightness_get = rb532_led_get,
+	.default_trigger = "nand-disk",
+};
+
+static int rb532_led_probe(struct platform_device *pdev)
+{
+	return led_classdev_register(&pdev->dev, &rb532_uled);
+}
+
+static int rb532_led_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&rb532_uled);
+	return 0;
+}
+
+static struct platform_driver rb532_led_driver = {
+	.probe = rb532_led_probe,
+	.remove = rb532_led_remove,
+	.driver = {
+		.name = "rb532-led",
+		.owner = THIS_MODULE,
+	},
+};
+
+module_platform_driver(rb532_led_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("User LED support for Routerboard532");
+MODULE_AUTHOR("Phil Sutter <n0-1@freewrt.org>");
+MODULE_ALIAS("platform:rb532-led");

drivers/leds/leds-regulator.c

@@ -0,0 +1,235 @@
+/*
+ * leds-regulator.c - LED class driver for regulator driven LEDs.
+ *
+ * Copyright (C) 2009 Antonio Ospite <ospite@studenti.unina.it>
+ *
+ * Inspired by leds-wm8350 driver.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/leds.h>
+#include <linux/leds-regulator.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+
+#define to_regulator_led(led_cdev) \
+	container_of(led_cdev, struct regulator_led, cdev)
+
+struct regulator_led {
+	struct led_classdev cdev;
+	enum led_brightness value;
+	int enabled;
+	struct mutex mutex;
+	struct work_struct work;
+
+	struct regulator *vcc;
+};
+
+static inline int led_regulator_get_max_brightness(struct regulator *supply)
+{
+	int ret;
+	int voltage = regulator_list_voltage(supply, 0);
+
+	if (voltage <= 0)
+		return 1;
+
+	/* even if regulator can't change voltages,
+	 * we still assume it can change status
+	 * and the LED can be turned on and off.
+	 */
+	ret = regulator_set_voltage(supply, voltage, voltage);
+	if (ret < 0)
+		return 1;
+
+	return regulator_count_voltages(supply);
+}
+
+static int led_regulator_get_voltage(struct regulator *supply,
+		enum led_brightness brightness)
+{
+	if (brightness == 0)
+		return -EINVAL;
+
+	return regulator_list_voltage(supply, brightness - 1);
+}
+
+
+static void regulator_led_enable(struct regulator_led *led)
+{
+	int ret;
+
+	if (led->enabled)
+		return;
+
+	ret = regulator_enable(led->vcc);
+	if (ret != 0) {
+		dev_err(led->cdev.dev, "Failed to enable vcc: %d\n", ret);
+		return;
+	}
+
+	led->enabled = 1;
+}
+
+static void regulator_led_disable(struct regulator_led *led)
+{
+	int ret;
+
+	if (!led->enabled)
+		return;
+
+	ret = regulator_disable(led->vcc);
+	if (ret != 0) {
+		dev_err(led->cdev.dev, "Failed to disable vcc: %d\n", ret);
+		return;
+	}
+
+	led->enabled = 0;
+}
+
+static void regulator_led_set_value(struct regulator_led *led)
+{
+	int voltage;
+	int ret;
+
+	mutex_lock(&led->mutex);
+
+	if (led->value == LED_OFF) {
+		regulator_led_disable(led);
+		goto out;
+	}
+
+	if (led->cdev.max_brightness > 1) {
+		voltage = led_regulator_get_voltage(led->vcc, led->value);
+		dev_dbg(led->cdev.dev, "brightness: %d voltage: %d\n",
+				led->value, voltage);
+
+		ret = regulator_set_voltage(led->vcc, voltage, voltage);
+		if (ret != 0)
+			dev_err(led->cdev.dev, "Failed to set voltage %d: %d\n",
+				voltage, ret);
+	}
+
+	regulator_led_enable(led);
+
+out:
+	mutex_unlock(&led->mutex);
+}
+
+static void led_work(struct work_struct *work)
+{
+	struct regulator_led *led;
+
+	led = container_of(work, struct regulator_led, work);
+	regulator_led_set_value(led);
+}
+
+static void regulator_led_brightness_set(struct led_classdev *led_cdev,
+			   enum led_brightness value)
+{
+	struct regulator_led *led = to_regulator_led(led_cdev);
+
+	led->value = value;
+	schedule_work(&led->work);
+}
+
+static int regulator_led_probe(struct platform_device *pdev)
+{
+	struct led_regulator_platform_data *pdata =
+			dev_get_platdata(&pdev->dev);
+	struct regulator_led *led;
+	struct regulator *vcc;
+	int ret = 0;
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "no platform data\n");
+		return -ENODEV;
+	}
+
+	vcc = regulator_get_exclusive(&pdev->dev, "vled");
+	if (IS_ERR(vcc)) {
+		dev_err(&pdev->dev, "Cannot get vcc for %s\n", pdata->name);
+		return PTR_ERR(vcc);
+	}
+
+	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+	if (led == NULL) {
+		ret = -ENOMEM;
+		goto err_vcc;
+	}
+
+	led->cdev.max_brightness = led_regulator_get_max_brightness(vcc);
+	if (pdata->brightness > led->cdev.max_brightness) {
+		dev_err(&pdev->dev, "Invalid default brightness %d\n",
+				pdata->brightness);
+		ret = -EINVAL;
+		goto err_vcc;
+	}
+	led->value = pdata->brightness;
+
+	led->cdev.brightness_set = regulator_led_brightness_set;
+	led->cdev.name = pdata->name;
+	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
+	led->vcc = vcc;
+
+	/* to handle correctly an already enabled regulator */
+	if (regulator_is_enabled(led->vcc))
+		led->enabled = 1;
+
+	mutex_init(&led->mutex);
+	INIT_WORK(&led->work, led_work);
+
+	platform_set_drvdata(pdev, led);
+
+	ret = led_classdev_register(&pdev->dev, &led->cdev);
+	if (ret < 0) {
+		cancel_work_sync(&led->work);
+		goto err_vcc;
+	}
+
+	/* to expose the default value to userspace */
+	led->cdev.brightness = led->value;
+
+	/* Set the default led status */
+	regulator_led_set_value(led);
+
+	return 0;
+
+err_vcc:
+	regulator_put(vcc);
+	return ret;
+}
+
+static int regulator_led_remove(struct platform_device *pdev)
+{
+	struct regulator_led *led = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&led->cdev);
+	cancel_work_sync(&led->work);
+	regulator_led_disable(led);
+	regulator_put(led->vcc);
+	return 0;
+}
+
+static struct platform_driver regulator_led_driver = {
+	.driver = {
+		   .name  = "leds-regulator",
+		   .owner = THIS_MODULE,
+		   },
+	.probe  = regulator_led_probe,
+	.remove = regulator_led_remove,
+};
+
+module_platform_driver(regulator_led_driver);
+
+MODULE_AUTHOR("Antonio Ospite <ospite@studenti.unina.it>");
+MODULE_DESCRIPTION("Regulator driven LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-regulator");

drivers/leds/leds-s2mpb02.c

@@ -0,0 +1,525 @@
+/*
+ * LED driver for Samsung S2MPB02
+ *
+ * Copyright (C) 2014 Samsung Electronics
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *  This driver is based on leds-max77804.c
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/mfd/s2mpb02.h>
+#include <linux/mfd/s2mpb02-private.h>
+#include <linux/leds-s2mpb02.h>
+#include <linux/ctype.h>
+
+extern struct class *camera_class; /*sys/class/camera*/
+struct device *s2mpb02_led_dev;
+struct s2mpb02_led_data *global_led_datas[S2MPB02_LED_MAX];
+
+struct s2mpb02_led_data {
+	struct led_classdev led;
+	struct s2mpb02_dev *s2mpb02;
+	struct s2mpb02_led *data;
+	struct i2c_client *i2c;
+	struct work_struct work;
+	struct mutex lock;
+	spinlock_t value_lock;
+	int brightness;
+	int test_brightness;
+};
+
+static u8 leds_mask[S2MPB02_LED_MAX] = {
+	S2MPB02_FLASH_MASK,
+	S2MPB02_TORCH_MASK,
+};
+
+static u8 leds_shift[S2MPB02_LED_MAX] = {
+	4,
+	0,
+};
+
+u32 original_brightness;
+
+static int s2mpb02_set_bits(struct i2c_client *client, const u8 reg,
+			     const u8 mask, const u8 inval)
+{
+	int ret;
+	u8 value;
+
+	ret = s2mpb02_read_reg(client, reg, &value);
+	if (unlikely(ret < 0))
+		return ret;
+
+	value = (value & ~mask) | (inval & mask);
+
+	ret = s2mpb02_write_reg(client, reg, value);
+
+	return ret;
+}
+
+static int s2mpb02_led_get_en_value(struct s2mpb02_led_data *led_data, int on)
+{
+	if (on) {
+		if (led_data->data->id == S2MPB02_FLASH_LED_1)
+			return ((S2MPB02_FLED_ENABLE
+			 << S2MPB02_FLED_ENABLE_SHIFT) |
+				 (S2MPB02_FLED_FLASH_MODE
+			 << S2MPB02_FLED_MODE_SHIFT));
+				/* Turn on FLASH by I2C */
+		else
+			return ((S2MPB02_FLED_ENABLE
+			 << S2MPB02_FLED_ENABLE_SHIFT) |
+				(S2MPB02_FLED_TORCH_MODE
+			 << S2MPB02_FLED_MODE_SHIFT));
+				/* Turn on TORCH by I2C */
+	} else
+		return (S2MPB02_FLED_DISABLE
+			<< S2MPB02_FLED_ENABLE_SHIFT);
+				/* controlled by GPIO */
+}
+
+static void s2mpb02_led_set(struct led_classdev *led_cdev,
+						enum led_brightness value)
+{
+	unsigned long flags;
+	struct s2mpb02_led_data *led_data
+		= container_of(led_cdev, struct s2mpb02_led_data, led);
+
+	pr_debug("[LED] %s\n", __func__);
+
+	spin_lock_irqsave(&led_data->value_lock, flags);
+	led_data->data->brightness = min_t(int, (int)value,
+				 S2MPB02_FLASH_TORCH_CURRENT_MAX);
+	spin_unlock_irqrestore(&led_data->value_lock, flags);
+
+	schedule_work(&led_data->work);
+}
+
+static void led_set(struct s2mpb02_led_data *led_data)
+{
+	int ret;
+	struct s2mpb02_led *data = led_data->data;
+	int id = data->id;
+	int value;
+
+	if (led_data->data->brightness == LED_OFF) {
+		value = s2mpb02_led_get_en_value(led_data, 0);
+		ret = s2mpb02_set_bits(led_data->i2c, S2MPB02_REG_FLED_CTRL1,
+					 S2MPB02_FLED_ENABLE_MODE_MASK, value);
+		if (unlikely(ret))
+			goto error_set_bits;
+
+		/* set current */
+		ret = s2mpb02_set_bits(led_data->i2c, S2MPB02_REG_FLED_CUR1,
+					leds_mask[id],
+					data->brightness << leds_shift[id]);
+		if (unlikely(ret))
+			goto error_set_bits;
+	} else {
+
+		/* set current */
+		ret = s2mpb02_set_bits(led_data->i2c, S2MPB02_REG_FLED_CUR1,
+			  leds_mask[id], data->brightness << leds_shift[id]);
+		if (unlikely(ret))
+			goto error_set_bits;
+
+		/* Turn on LED by I2C */
+		value = s2mpb02_led_get_en_value(led_data, 1);
+		ret = s2mpb02_set_bits(led_data->i2c, S2MPB02_REG_FLED_CTRL1,
+				 S2MPB02_FLED_ENABLE_MODE_MASK, value);
+		if (unlikely(ret))
+			goto error_set_bits;
+	}
+
+	return;
+
+error_set_bits:
+	pr_err("%s: can't set led level %d\n", __func__, ret);
+
+	return;
+}
+
+static void s2mpb02_led_work(struct work_struct *work)
+{
+	struct s2mpb02_led_data *led_data
+		= container_of(work, struct s2mpb02_led_data, work);
+
+	pr_debug("[LED] %s\n", __func__);
+
+	mutex_lock(&led_data->lock);
+	led_set(led_data);
+	mutex_unlock(&led_data->lock);
+}
+
+static int s2mpb02_led_setup(struct s2mpb02_led_data *led_data)
+{
+	int ret = 0;
+	struct s2mpb02_led *data = led_data->data;
+	int id = data->id;
+	int value;
+
+	/* set Low Voltage operating mode disable */
+	ret |= s2mpb02_update_reg(led_data->i2c, S2MPB02_REG_FLED_CTRL1,
+				S2MPB02_FLED_CTRL1_LV_DISABLE,
+				S2MPB02_FLED_CTRL1_LV_EN_MASK);
+
+	/* set current & timeout */
+	ret |= s2mpb02_update_reg(led_data->i2c, S2MPB02_REG_FLED_CUR1,
+		  data->brightness << leds_shift[id], leds_mask[id]);
+	ret |= s2mpb02_update_reg(led_data->i2c, S2MPB02_REG_FLED_TIME1,
+		  data->timeout << leds_shift[id], leds_mask[id]);
+
+	value = s2mpb02_led_get_en_value(led_data, 0);
+	ret = s2mpb02_update_reg(led_data->i2c,	S2MPB02_REG_FLED_CTRL1,
+		 value, S2MPB02_FLED_ENABLE_MODE_MASK);
+
+	return ret;
+}
+
+void s2mpb02_led_get_status(struct led_classdev *led_cdev,
+					 bool status, bool onoff)
+{
+	int ret = 0;
+	u8 value[6] = {0, };
+	struct s2mpb02_led_data *led_data
+		= container_of(led_cdev, struct s2mpb02_led_data, led);
+
+	ret = s2mpb02_read_reg(led_data->i2c,
+			 S2MPB02_REG_FLED_CTRL1, &value[0]);  /* Fled_ctrl1 */
+	ret |= s2mpb02_read_reg(led_data->i2c,
+			 S2MPB02_REG_FLED_CTRL2, &value[1]); /* Fled_ctrl2 */
+	ret |= s2mpb02_read_reg(led_data->i2c,
+			 S2MPB02_REG_FLED_CUR1, &value[2]); /* Fled_cur1 */
+	ret |= s2mpb02_read_reg(led_data->i2c,
+			 S2MPB02_REG_FLED_TIME1, &value[3]); /* Fled_time1 */
+	ret |= s2mpb02_read_reg(led_data->i2c,
+			 S2MPB02_REG_FLED_CUR2, &value[4]); /* Fled_cur2 */
+	ret |= s2mpb02_read_reg(led_data->i2c,
+			 S2MPB02_REG_FLED_TIME2, &value[5]); /* Fled_time2 */
+	if (unlikely(ret < 0))
+		pr_info("%s : error to get dt node\n", __func__);
+
+	pr_info("%s[%d, %d] : Fled_ctrl1 = 0x%12x, Fled_ctrl2 = 0x%13x, Fled_cur1 = 0x%14x, Fled_time1 = 0x%15x, Fled_cur2 = 0x%16x, Fled_time2 = 0x%17x\n",
+		__func__, status, onoff,
+		 value[0], value[1], value[2], value[3], value[4], value[5]);
+}
+
+ssize_t s2mpb02_store(struct device *dev,
+			struct device_attribute *attr, const char *buf,
+			size_t count)
+{
+	int value = 0;
+
+	if ((buf == NULL) || kstrtouint(buf, 10, &value))
+		return -1;
+
+	if (global_led_datas[S2MPB02_TORCH_LED_1] == NULL) {
+		pr_err("<%s> global_led_datas[S2MPB02_TORCH_LED_1] is NULL\n",
+				 __func__);
+		return -1;
+	}
+
+	pr_info("[LED]%s , value:%d\n", __func__, value);
+	if (value > 0) {
+		if (value >= S2MPB02_TORCH_OUT_I_MAX) {
+			if (value == 100)
+				value = LED_FULL;
+			else
+				value = S2MPB02_TORCH_OUT_I_MAX - 1;
+		}
+		/* turn on torch */
+		global_led_datas[S2MPB02_TORCH_LED_1]->data->brightness = value;
+	} else {
+		/* turn off torch */
+		global_led_datas[S2MPB02_TORCH_LED_1]->data->brightness =
+								 LED_OFF;
+	}
+
+	led_set(global_led_datas[S2MPB02_TORCH_LED_1]);
+	if (value <= 0) {
+		s2mpb02_set_bits(global_led_datas[S2MPB02_TORCH_LED_1]->i2c,
+		S2MPB02_REG_FLED_CUR1,
+		leds_mask[global_led_datas[S2MPB02_TORCH_LED_1]->data->id],
+		original_brightness <<
+		leds_shift[global_led_datas[S2MPB02_TORCH_LED_1]->data->id]);
+		global_led_datas[S2MPB02_TORCH_LED_1]->data->brightness =
+							 original_brightness;
+	}
+
+	return count;
+}
+
+ssize_t s2mpb02_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	if (global_led_datas[S2MPB02_TORCH_LED_1] == NULL) {
+		pr_err("<%s> global_led_datas[S2MPB02_TORCH_LED_1] is NULL\n",
+								 __func__);
+		return -1;
+	}
+
+	pr_info("[LED] %s , MAX STEP TORCH_LED:%d\n", __func__,
+					 S2MPB02_TORCH_OUT_I_MAX - 1);
+	return sprintf(buf, "%d\n", S2MPB02_TORCH_OUT_I_MAX - 1);
+}
+
+static DEVICE_ATTR(rear_flash, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH,
+	s2mpb02_show, s2mpb02_store);
+
+#if defined(CONFIG_OF)
+static int of_s2mpb02_torch_dt(struct s2mpb02_dev *iodev,
+					struct s2mpb02_led_platform_data *pdata)
+{
+	struct device_node *led_np, *np, *c_np;
+	int ret;
+	u32 temp;
+	const char *temp_str;
+	int index;
+
+	led_np = iodev->dev->of_node;
+	if (!led_np) {
+		pr_info("<%s> could not find led sub-node\n", __func__);
+		return -ENODEV;
+	}
+
+	np = of_find_node_by_name(led_np, "torch");
+	if (!np) {
+		pr_info("<%s> could not find led sub-node\n",
+								__func__);
+		return -EINVAL;
+	}
+
+	pdata->num_leds = of_get_child_count(np);
+
+	for_each_child_of_node(np, c_np) {
+		ret = of_property_read_u32(c_np, "id", &temp);
+		if (ret < 0)
+			goto dt_err;
+
+		index = temp;
+		pdata->leds[index].id = temp;
+
+		ret = of_property_read_string(c_np, "ledname", &temp_str);
+		if (ret < 0)
+			goto dt_err;
+
+		pdata->leds[index].name = temp_str;
+		ret = of_property_read_u32(c_np, "brightness", &temp);
+		if (ret < 0)
+			goto dt_err;
+
+		if (temp > S2MPB02_FLASH_TORCH_CURRENT_MAX)
+			temp = S2MPB02_FLASH_TORCH_CURRENT_MAX;
+		pdata->leds[index].brightness = temp;
+		original_brightness = temp;
+
+		ret = of_property_read_u32(c_np, "timeout", &temp);
+		if (ret < 0)
+			goto dt_err;
+
+		if (temp > S2MPB02_TIMEOUT_MAX)
+			temp = S2MPB02_TIMEOUT_MAX;
+		pdata->leds[index].timeout = temp;
+	}
+	of_node_put(led_np);
+
+	return 0;
+dt_err:
+	pr_err("%s failed to get a dt info\n", __func__);
+	return ret;
+}
+#endif /* CONFIG_OF */
+
+static int s2mpb02_led_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	int i;
+	struct s2mpb02_dev *s2mpb02 = dev_get_drvdata(pdev->dev.parent);
+#ifndef CONFIG_OF
+	struct s2mpb02_platform_data *s2mpb02_pdata
+		= dev_get_platdata(s2mpb02->dev);
+#endif
+	struct s2mpb02_led_platform_data *pdata;
+	struct s2mpb02_led_data *led_data;
+	struct s2mpb02_led *data;
+	struct s2mpb02_led_data **led_datas;
+
+#ifdef CONFIG_OF
+	pdata = kzalloc(sizeof(struct s2mpb02_led_platform_data), GFP_KERNEL);
+	if (!pdata) {
+		pr_err("%s: failed to allocate driver data\n", __func__);
+		return -ENOMEM;
+	}
+	ret = of_s2mpb02_torch_dt(s2mpb02, pdata);
+	if (ret < 0) {
+		pr_err("s2mpb02-torch : %s not found torch dt! ret[%d]\n",
+				 __func__, ret);
+		kfree(pdata);
+		return -1;
+	}
+#else
+	pdata = s2mpb02_pdata->led_data;
+	if (pdata == NULL) {
+		pr_err("[LED] no platform data for this led is found\n");
+		return -EFAULT;
+	}
+#endif
+	led_datas = kzalloc(sizeof(struct s2mpb02_led_data *)
+			    * S2MPB02_LED_MAX, GFP_KERNEL);
+	if (unlikely(!led_datas)) {
+		pr_err("[LED] memory allocation error %s", __func__);
+		kfree(pdata);
+		return -ENOMEM;
+	}
+	platform_set_drvdata(pdev, led_datas);
+
+	pr_info("[LED] %s %d leds\n", __func__, pdata->num_leds);
+
+	for (i = 0; i != pdata->num_leds; ++i) {
+		pr_info("%s led%d setup ...\n", __func__, i);
+
+		data = kzalloc(sizeof(struct s2mpb02_led), GFP_KERNEL);
+		if (unlikely(!data)) {
+			pr_err("[LED] memory allocation error %s\n", __func__);
+			ret = -ENOMEM;
+			continue;
+		}
+
+		memcpy(data, &(pdata->leds[i]), sizeof(struct s2mpb02_led));
+
+		led_data = kzalloc(sizeof(struct s2mpb02_led_data),
+				   GFP_KERNEL);
+
+		global_led_datas[i] = led_data;
+		led_datas[i] = led_data;
+		if (unlikely(!led_data)) {
+			pr_err("[LED] memory allocation error %s\n", __func__);
+			ret = -ENOMEM;
+			kfree(data);
+			continue;
+		}
+
+		led_data->s2mpb02 = s2mpb02;
+		led_data->i2c = s2mpb02->i2c;
+		led_data->data = data;
+		led_data->led.name = data->name;
+		led_data->led.brightness_set = s2mpb02_led_set;
+		led_data->led.brightness = LED_OFF;
+		led_data->brightness = data->brightness;
+		led_data->led.flags = 0;
+		led_data->led.max_brightness = S2MPB02_FLASH_TORCH_CURRENT_MAX;
+
+		mutex_init(&led_data->lock);
+		spin_lock_init(&led_data->value_lock);
+		INIT_WORK(&led_data->work, s2mpb02_led_work);
+
+		ret = led_classdev_register(&pdev->dev, &led_data->led);
+		if (unlikely(ret)) {
+			pr_err("unable to register LED\n");
+			cancel_work_sync(&led_data->work);
+			mutex_destroy(&led_data->lock);
+			kfree(data);
+			kfree(led_data);
+			led_datas[i] = NULL;
+			global_led_datas[i] = NULL;
+			ret = -EFAULT;
+			continue;
+		}
+
+		ret = s2mpb02_led_setup(led_data);
+		if (unlikely(ret)) {
+			pr_err("unable to register LED\n");
+			cancel_work_sync(&led_data->work);
+			mutex_destroy(&led_data->lock);
+			led_classdev_unregister(&led_data->led);
+			kfree(data);
+			kfree(led_data);
+			led_datas[i] = NULL;
+			global_led_datas[i] = NULL;
+			ret = -EFAULT;
+		}
+	}
+
+#ifdef CONFIG_OF
+	kfree(pdata);
+#endif
+
+	s2mpb02_led_dev = device_create(camera_class, NULL, 3, NULL, "flash");
+	if (IS_ERR(s2mpb02_led_dev)) {
+		pr_err("<%s> Failed to create device(flash)!\n", __func__);
+	} else {
+		if (device_create_file(s2mpb02_led_dev,
+					 &dev_attr_rear_flash) < 0) {
+			pr_err("<%s> failed to create device file, %s\n",
+				__func__ , dev_attr_rear_flash.attr.name);
+		}
+	}
+
+	pr_err("<%s> end\n", __func__);
+
+	return ret;
+}
+
+static int s2mpb02_led_remove(struct platform_device *pdev)
+{
+	struct s2mpb02_led_data **led_datas = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i != S2MPB02_LED_MAX; ++i) {
+		if (led_datas[i] == NULL)
+			continue;
+
+		cancel_work_sync(&led_datas[i]->work);
+		mutex_destroy(&led_datas[i]->lock);
+		led_classdev_unregister(&led_datas[i]->led);
+		kfree(led_datas[i]->data);
+		kfree(led_datas[i]);
+		led_datas[i] = NULL;
+		global_led_datas[i] = NULL;
+	}
+	kfree(led_datas);
+
+	if (s2mpb02_led_dev)
+		device_remove_file(s2mpb02_led_dev, &dev_attr_rear_flash);
+
+	if (camera_class && s2mpb02_led_dev)
+		device_destroy(camera_class, s2mpb02_led_dev->devt);
+
+	return 0;
+}
+
+static struct platform_driver s2mpb02_led_driver = {
+	.probe		= s2mpb02_led_probe,
+	.remove		= s2mpb02_led_remove,
+	.driver		= {
+		.name	= "s2mpb02-led",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init s2mpb02_led_init(void)
+{
+	return platform_driver_register(&s2mpb02_led_driver);
+}
+module_init(s2mpb02_led_init);
+
+static void __exit s2mpb02_led_exit(void)
+{
+	platform_driver_unregister(&s2mpb02_led_driver);
+}
+module_exit(s2mpb02_led_exit);
+
+MODULE_DESCRIPTION("S2MPB02 LED driver");
+MODULE_LICENSE("GPL");
+

drivers/leds/leds-s2mu003.c

@@ -0,0 +1,715 @@
+/*
+ * leds-s2mu003.c - LED class driver for S2MU003 LEDs.
+ *
+ * Copyright (C) 2014 Samsung Electronics
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/leds.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/mfd/samsung/s2mu003.h>
+#include <linux/mfd/samsung/s2mu003-private.h>
+#include <linux/leds-s2mu003.h>
+#include <linux/platform_device.h>
+
+struct device *s2mu003_dev;
+struct s2mu003_led_data *global_led_datas[S2MU003_LED_MAX];
+
+struct s2mu003_led_data {
+	struct s2mu003_mfd_chip *iodev;
+	struct led_classdev cdev;
+	struct s2mu003_led *data;
+	struct notifier_block batt_nb;
+	struct i2c_client *i2c;
+	struct work_struct work;
+	struct mutex lock;
+	spinlock_t value_lock;
+	int brightness;
+	int test_brightness;
+	int attach_ta;
+	int attach_sdp;
+	bool enable;
+	int torch_pin;
+	int flash_pin;
+};
+
+u32 original_brightness;
+#ifdef CONFIG_MUIC_NOTIFIER
+static void attach_cable_check(muic_attached_dev_t attached_dev,
+					int *attach_ta, int *attach_sdp)
+{
+	if (attached_dev == ATTACHED_DEV_USB_MUIC)
+		*attach_sdp = 1;
+	else
+		*attach_sdp = 0;
+
+	switch (attached_dev) {
+	case ATTACHED_DEV_TA_MUIC:
+	case ATTACHED_DEV_SMARTDOCK_TA_MUIC:
+	case ATTACHED_DEV_UNOFFICIAL_TA_MUIC:
+	case ATTACHED_DEV_UNOFFICIAL_ID_TA_MUIC:
+	case ATTACHED_DEV_CDP_MUIC:
+	case ATTACHED_DEV_USB_MUIC:
+	case ATTACHED_DEV_UNOFFICIAL_ID_CDP_MUIC:
+		*attach_ta = 1;
+		break;
+	default:
+		*attach_ta = 0;
+		break;
+	}
+}
+
+static int ta_notification(struct notifier_block *nb,
+		unsigned long action, void *data)
+{
+	muic_attached_dev_t attached_dev = *(muic_attached_dev_t *)data;
+#ifdef CONFIG_S2MU003_LEDS_I2C
+	u8 temp;
+#endif
+	int ret = 0;
+	struct s2mu003_led_data *led_data =
+		container_of(nb, struct s2mu003_led_data, batt_nb);
+
+	switch (action) {
+	case MUIC_NOTIFY_CMD_DETACH:
+	case MUIC_NOTIFY_CMD_LOGICALLY_DETACH:
+		if (!led_data->attach_ta)
+			goto err;
+
+		led_data->attach_ta = 0;
+
+		if (!led_data->data->id) {
+			pr_info("%s : flash mode\n", __func__);
+			goto err;
+		}
+#ifndef CONFIG_S2MU003_LEDS_I2C
+		if (gpio_is_valid(led_data->torch_pin)) {
+			ret = devm_gpio_request(led_data->cdev.dev,
+					led_data->torch_pin, "s2mu003_gpio");
+			if (ret) {
+				pr_err("%s : fail to assignment gpio\n", __func__);
+				goto gpio_free_data;
+			}
+		}
+		if (gpio_get_value(led_data->torch_pin)) {
+			gpio_direction_output(led_data->torch_pin, 0);
+			gpio_direction_output(led_data->torch_pin, 1);
+			goto gpio_free_data;
+		}
+#else
+		temp = s2mu003_reg_read(led_data->i2c,
+				S2MU003_FLED_CH1_CTRL4);
+		if ((temp & 0x0C) == 0x0C) {
+			ret = s2mu003_assign_bits(led_data->i2c,
+				S2MU003_FLED_CH1_CTRL4,
+				S2MU003_TORCH_ENABLE_MASK,
+				S2MU003_FLASH_TORCH_OFF);
+
+			pr_info("%s : LED OFF\n", __func__);
+			if (ret < 0)
+				goto err;
+			ret = s2mu003_assign_bits(led_data->i2c,
+				S2MU003_FLED_CH1_CTRL4,
+				S2MU003_TORCH_ENABLE_MASK,
+				S2MU003_TORCH_ON_I2C);
+
+			pr_info("%s : LED ON\n", __func__);
+			if (ret < 0)
+				goto err;
+		}
+#endif
+		break;
+	case MUIC_NOTIFY_CMD_ATTACH:
+	case MUIC_NOTIFY_CMD_LOGICALLY_ATTACH:
+		led_data->attach_ta = 0;
+		attach_cable_check(attached_dev, &led_data->attach_ta, &led_data->attach_sdp);
+		return 0;
+	default:
+		goto err;
+		break;
+	}
+
+#ifndef CONFIG_S2MU003_LEDS_I2C
+gpio_free_data:
+	devm_gpio_free(led_data->cdev.dev, led_data->torch_pin);
+	pr_info("%s : gpio free\n", __func__);
+#endif
+	pr_info("%s : complete detached\n", __func__);
+	return 0;
+err:
+	pr_err("%s : abandond access %d\n", __func__, led_data->attach_ta);
+	return 0;
+}
+#endif
+
+static void s2mu003_led_set(struct led_classdev *led_cdev,
+			enum led_brightness value)
+{
+	unsigned long flags;
+	struct s2mu003_led_data *led_data =
+		container_of(led_cdev, struct s2mu003_led_data, cdev);
+	u8 max;
+
+	max = led_cdev->max_brightness;
+
+	spin_lock_irqsave(&led_data->value_lock, flags);
+	led_data->data->brightness = min_t(int, (int)value, (int)max);
+
+	pr_info("%s value = %d, max = %d\n", __func__, led_data->data->brightness, max);
+	spin_unlock_irqrestore(&led_data->value_lock, flags);
+
+	schedule_work(&led_data->work);
+	return;
+}
+
+static void led_set(struct s2mu003_led_data *led_data)
+{
+	int ret;
+	struct s2mu003_led *data = led_data->data;
+	int id = data->id;
+	u8 mask = 0, reg = 0;
+
+#ifdef CONFIG_S2MU003_LEDS_I2C
+	u8 enable_mask, value;
+#else
+	int gpio_pin;
+#endif
+	if (id == S2MU003_FLASH_LED) {
+		pr_info("%s led mode is flash\n", __func__);
+		reg = S2MU003_FLED_CH1_CTRL0;
+		mask = S2MU003_FLASH_IOUT_MASK;
+#ifndef CONFIG_S2MU003_LEDS_I2C
+		pr_info("%s gpio_flash mode\n", __func__);
+		gpio_pin = led_data->flash_pin;
+#endif
+	} else {
+		pr_info("%s led mode is torch\n", __func__);
+		reg = S2MU003_FLED_CH1_CTRL1;
+		mask = S2MU003_TORCH_IOUT_MASK;
+#ifndef CONFIG_S2MU003_LEDS_I2C
+		pr_info("%s gpio_torch mode\n", __func__);
+		gpio_pin = led_data->torch_pin;
+#endif
+	}
+
+
+#ifndef CONFIG_S2MU003_LEDS_I2C
+	if (gpio_is_valid(gpio_pin)) {
+		ret = devm_gpio_request(led_data->cdev.dev, gpio_pin,
+				"s2mu003_gpio");
+		if (ret) {
+			pr_err("%s : fail to assignment gpio\n", __func__);
+			goto error_set_bits;
+		}
+	}
+#endif
+	pr_info("%s start led_set\n", __func__);
+
+	if (led_data->data->brightness == LED_OFF) {
+		ret = s2mu003_assign_bits(led_data->i2c, reg,
+				mask, led_data->data->brightness);
+		if (ret < 0)
+			goto error_set_bits;
+
+		pr_info("%s led off\n", __func__);
+#ifdef CONFIG_S2MU003_LEDS_I2C
+		value = S2MU003_FLASH_TORCH_OFF;
+#else
+		gpio_direction_output(gpio_pin, 0);
+#endif
+		/* torch mode off sequence */
+		if (id && led_data->attach_ta) {
+			ret = s2mu003_assign_bits(led_data->i2c,
+				S2MU003_FLED_CTRL1, 0x80, 0x00);
+			if (ret < 0)
+				goto error_set_bits;
+		}
+#ifndef CONFIG_S2MU003_LEDS_I2C
+		goto gpio_free_data;
+#endif
+	} else {
+		pr_info("%s led on\n", __func__);
+		/* torch mode on sequence */
+		if (id && led_data->attach_ta) {
+			ret = s2mu003_assign_bits(led_data->i2c,
+				S2MU003_FLED_CTRL1, 0x80, 0x80);
+			if (ret < 0)
+				goto error_set_bits;
+			/* ta attach & sdp mode :  brightness limit 300mA */
+			if (led_data->attach_sdp) {
+				led_data->data->brightness =
+					(led_data->data->brightness > 0x5) ?
+					0x5 : led_data->data->brightness;
+			}
+		}
+		ret = s2mu003_assign_bits(led_data->i2c,
+				reg, mask, led_data->data->brightness);
+		if (ret < 0)
+			goto error_set_bits;
+
+#ifdef CONFIG_S2MU003_LEDS_I2C
+		value = id ? S2MU003_TORCH_ON_I2C : S2MU003_FLASH_ON_I2C;
+#else
+		gpio_direction_output(gpio_pin, 1);
+		goto gpio_free_data;
+
+#endif
+	}
+#ifdef CONFIG_S2MU003_LEDS_I2C
+	enable_mask = id ? S2MU003_TORCH_ENABLE_MASK :
+		S2MU003_FLASH_ENABLE_MASK;
+
+	ret = s2mu003_assign_bits(led_data->i2c,
+		S2MU003_FLED_CH1_CTRL4,
+		enable_mask, value);
+
+	if (ret < 0)
+		goto error_set_bits;
+#endif
+	return;
+
+#ifndef CONFIG_S2MU003_LEDS_I2C
+gpio_free_data:
+	devm_gpio_free(led_data->cdev.dev, gpio_pin);
+	pr_info("%s : gpio free\n", __func__);
+	return;
+#endif
+error_set_bits:
+	pr_err("%s: can't set led level %d\n", __func__, ret);
+	return;
+}
+
+static void s2mu003_led_work(struct work_struct *work)
+{
+	struct s2mu003_led_data *led_data
+		= container_of(work, struct s2mu003_led_data, work);
+
+	pr_debug("%s [led]\n", __func__);
+
+	mutex_lock(&led_data->lock);
+	led_set(led_data);
+	mutex_unlock(&led_data->lock);
+}
+
+static int s2mu003_led_setup(struct s2mu003_led_data *led_data)
+{
+	int ret = 0;
+#ifdef CONFIG_S2MU003_LEDS_I2C
+	int mask, value;
+#endif
+	ret = s2mu003_assign_bits(led_data->i2c, 0x89, 0x0f, 0x0f);
+	if (ret < 0)
+		goto out;
+
+	ret = s2mu003_assign_bits(led_data->i2c, S2MU003_FLED_CTRL0,
+							0x07, 0x07);
+	if (ret < 0)
+		goto out;
+
+	ret = s2mu003_assign_bits(led_data->i2c, S2MU003_FLED_CTRL2,
+			S2MU003_EN_CHANNEL_SHARE_MASK, 0x80);
+	if (ret < 0)
+		goto out;
+
+	ret = s2mu003_assign_bits(led_data->i2c, S2MU003_FLED_CTRL2,
+			S2MU003_BOOST_VOUT_FLASH_MASK, 0x23);
+	if (ret < 0)
+		goto out;
+
+	ret = s2mu003_assign_bits(led_data->i2c,
+			S2MU003_FLED_CH1_CTRL3, 0x80, 0x80);
+	if (ret < 0)
+		goto out;
+
+	ret = s2mu003_assign_bits(led_data->i2c, S2MU003_FLED_CH1_CTRL1,
+			S2MU003_TORCH_IOUT_MASK, S2MU003_TORCH_OUT_I_50MA);
+	if (ret < 0)
+		goto out;
+
+	ret = s2mu003_assign_bits(led_data->i2c, S2MU003_FLED_CH1_CTRL3,
+			S2MU003_TIMEOUT_MAX, S2MU003_FLASH_TIMEOUT_992MS);
+	if (ret < 0)
+		goto out;
+
+	ret = s2mu003_assign_bits(led_data->i2c, S2MU003_FLED_CH1_CTRL2,
+			S2MU003_TIMEOUT_MAX, S2MU003_TORCH_TIMEOUT_15728MS);
+	if (ret < 0)
+		goto out;
+
+#ifdef CONFIG_S2MU003_LEDS_I2C
+	value =	S2MU003_FLASH_TORCH_OFF;
+	mask = S2MU003_TORCH_ENABLE_MASK | S2MU003_FLASH_ENABLE_MASK;
+	ret = s2mu003_assign_bits(led_data->i2c, S2MU003_FLED_CH1_CTRL4,
+		mask, value);
+	if (ret < 0)
+		goto out;
+#endif
+	pr_info("%s : led setup complete\n", __func__);
+	return ret;
+
+out:
+	pr_err("%s : led setup fail\n", __func__);
+	return ret;
+}
+
+static ssize_t rear_flash_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct s2mu003_led_data *led_data =
+			container_of(led_cdev, struct s2mu003_led_data, cdev);
+	char *str;
+
+	switch (led_data->data->id) {
+	case S2MU003_FLASH_LED:
+		str = "FLASH";
+		break;
+	case S2MU003_TORCH_LED:
+		str = "TORCH";
+		break;
+	default:
+		str = "NONE";
+		break;
+	}
+
+	return snprintf(buf, 20, "%s\n", str);
+}
+
+static ssize_t rear_flash_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct s2mu003_led_data *led_data =
+			container_of(led_cdev, struct s2mu003_led_data, cdev);
+
+	enum led_brightness value;
+
+	mutex_lock(&led_data->lock);
+
+	if (led_data->data->id == S2MU003_FLASH_LED) {
+		pr_info("%s : flash is not controlled by sysfs", __func__);
+		goto err;
+	}
+
+	if (!strncmp(buf, "0", 1)) {
+		value = LED_OFF;
+		pr_info("%s : led off\n", __func__);
+	} else if (!strncmp(buf, "1", 1))
+		value = 0x2;
+	else if (!strncmp(buf, "2", 1))
+		value = 0x8;
+	else if (!strncmp(buf, "3", 1))
+		value = 0xf;
+	else {
+		pr_info("%s : incorrect number\n", __func__);
+		goto err;
+	}
+
+	if (led_cdev->flags & LED_SUSPENDED) {
+		pr_info("%s : led suspended\n", __func__);
+		goto err;
+	}
+
+	s2mu003_led_set(led_cdev, value);
+
+	mutex_unlock(&led_data->lock);
+	return size;
+
+err:
+	pr_err("%s : led abnormal end\n", __func__);
+
+	mutex_unlock(&led_data->lock);
+	return size;
+}
+
+static DEVICE_ATTR(rear_flash, 0644, rear_flash_show, rear_flash_store);
+
+#if defined(CONFIG_OF)
+static int s2mu003_led_dt_parse_pdata(struct s2mu003_mfd_chip *iodev,
+				struct s2mu003_fled_platform_data *pdata)
+{
+	struct device_node *led_np, *np, *c_np;
+	int ret;
+	u32 temp;
+	const char *temp_str;
+	int index;
+
+	led_np = iodev->dev->of_node;
+	if (!led_np) {
+		pr_err("<%s> could not find led sub-node led_np\n", __func__);
+		return -ENODEV;
+	}
+
+	np = of_find_node_by_name(led_np, "leds");
+	if (!np) {
+		pr_err("%s : could not find led sub-node np\n", __func__);
+		return -EINVAL;
+	}
+
+	ret = pdata->torch_pin = of_get_named_gpio(np, "torch-gpio", 0);
+	if (ret < 0) {
+		pr_err("%s : can't get torch-gpio\n", __func__);
+		return ret;
+	}
+
+	ret = pdata->flash_pin = of_get_named_gpio(np, "flash-gpio", 0);
+	if (ret < 0) {
+		pr_err("%s : can't get flash-gpio\n", __func__);
+		return ret;
+	}
+
+	pdata->num_leds = of_get_child_count(np);
+
+	for_each_child_of_node(np, c_np) {
+		ret = of_property_read_u32(c_np, "id", &temp);
+		if (ret < 0)
+			goto dt_err;
+		index = temp;
+		pdata->leds[index].id = temp;
+
+		ret = of_property_read_string(c_np, "ledname", &temp_str);
+		if (ret)
+			goto dt_err;
+		pdata->leds[index].name = temp_str;
+
+		ret = of_property_read_u32(c_np, "brightness", &temp);
+		if (ret)
+			goto dt_err;
+		if (temp > leds_cur_max[index])
+			temp = leds_cur_max[index];
+		pdata->leds[index].brightness = temp;
+		original_brightness = temp;
+		ret = of_property_read_u32(c_np, "timeout", &temp);
+		if (ret)
+			goto dt_err;
+		if (temp > leds_time_max[index])
+			temp = leds_time_max[index];
+		pdata->leds[index].timeout = temp;
+
+	}
+	return 0;
+dt_err:
+	pr_err("%s failed to get a timeout\n", __func__);
+	return ret;
+}
+#endif /* CONFIG_OF */
+
+static struct of_device_id s2mu003_fled_match_table[] = {
+	{ .compatible = "samsung,s2mu003led",},
+	{},
+};
+
+static int s2mu003_led_probe(struct platform_device *pdev)
+{
+	int ret = 0, i = 0;
+
+	struct s2mu003_mfd_chip *s2mu003 = dev_get_drvdata(pdev->dev.parent);
+#ifndef CONFIG_OF
+	struct s2mu003_mfd_platform_data *s2mu003_pdata = s2mu003->pdata;
+#endif
+	struct s2mu003_fled_platform_data *pdata;
+	struct s2mu003_led_data *led_data;
+	struct s2mu003_led *data;
+	struct s2mu003_led_data **led_datas;
+
+	pr_info("[%s] s2mu003_fled start\n", __func__);
+
+	if (!s2mu003) {
+		dev_err(&pdev->dev, "drvdata->dev.parent not supplied\n");
+		return -ENODEV;
+	}
+#ifdef CONFIG_OF
+	if (pdev->dev.parent->of_node) {
+		pdev->dev.of_node = of_find_compatible_node(
+				of_node_get(pdev->dev.parent->of_node), NULL,
+				s2mu003_fled_match_table[0].compatible);
+	}
+
+	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+	if (!pdata) {
+		dev_err(&pdev->dev, "Failed to allocate memory\n");
+		return -ENOMEM;
+	}
+
+	if (pdev->dev.of_node) {
+		ret = s2mu003_led_dt_parse_pdata(s2mu003, pdata);
+		if (ret < 0) {
+			pr_err("[%s] not found leds dt! ret[%d]\n",
+				__func__, ret);
+			return -1;
+		}
+	}
+#else
+	if (!s2mu003_pdata) {
+		dev_err(&pdev->dev, "platform data not supplied\n");
+		return -ENODEV;
+	}
+	pdata = s2mu003_pdata->fled_platform_data;
+	if (!pdata) {
+		pr_err("[%s] no platform data for this led is found\n",
+				__func__);
+		return -EFAULT;
+	}
+#endif
+
+	led_datas = kzalloc(sizeof(struct s2mu003_led_data *) * S2MU003_LED_MAX, GFP_KERNEL);
+
+	if (!led_datas) {
+		pr_err("[%s] memory allocation error led_datas", __func__);
+		devm_kfree(&pdev->dev, pdata);
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, led_datas);
+
+	pr_info("%s %d leds\n", __func__, pdata->num_leds);
+
+	for (i = 0; i != pdata->num_leds; ++i) {
+		pr_info("%s led%d setup ...\n", __func__, i);
+
+		data = kzalloc(sizeof(struct s2mu003_led), GFP_KERNEL);
+		global_led_datas[i] = led_data;
+		if (!data) {
+			pr_err("[%s] memory allocation error data\n",
+					__func__);
+			ret = -ENOMEM;
+			continue;
+		}
+
+		memcpy(data, &(pdata->leds[i]), sizeof(struct s2mu003_led));
+		led_data = devm_kzalloc(&pdev->dev,
+				sizeof(struct s2mu003_led_data), GFP_KERNEL);
+
+		led_datas[i] = led_data;
+
+		if (!led_data) {
+			pr_err("[%s] memory allocation error led_data\n",
+					__func__);
+			kfree(data);
+			ret = -ENOMEM;
+			continue;
+		}
+
+		led_data->iodev = s2mu003;
+		led_data->i2c = s2mu003->i2c_client;
+		led_data->data = data;
+		led_data->cdev.name = data->name;
+		led_data->cdev.brightness_set = s2mu003_led_set;
+		led_data->cdev.flags = 0;
+		led_data->cdev.brightness = data->brightness;
+		led_data->cdev.max_brightness = led_data->data->id ?
+		S2MU003_TORCH_OUT_I_400MA : S2MU003_FLASH_OUT_I_900MA;
+
+		mutex_init(&led_data->lock);
+		spin_lock_init(&led_data->value_lock);
+		INIT_WORK(&led_data->work, s2mu003_led_work);
+		ret = led_classdev_register(&pdev->dev, &led_data->cdev);
+		if (ret < 0) {
+			pr_err("unable to register LED\n");
+			cancel_work_sync(&led_data->work);
+			mutex_destroy(&led_data->lock);
+			kfree(data);
+			kfree(led_data);
+			global_led_datas[i] = NULL;
+			led_datas[i] = NULL;
+			ret = -EFAULT;
+			continue;
+		}
+		if (led_data->data->id == S2MU003_TORCH_LED) {
+			ret = device_create_file(led_data->cdev.dev,
+					&dev_attr_rear_flash);
+			if (ret < 0)
+				pr_err("%s :unable to create file\n", __func__);
+		}
+#ifndef CONFIG_S2MU003_LEDS_I2C
+		if (gpio_is_valid(pdata->torch_pin) &&
+				gpio_is_valid(pdata->flash_pin)) {
+			if (ret < 0) {
+				pr_err("%s : s2mu003 fled gpio allocation error\n",
+					__func__);
+			} else {
+				led_data->torch_pin = pdata->torch_pin;
+				led_data->flash_pin = pdata->flash_pin;
+			}
+		}
+#endif
+
+#ifdef CONFIG_MUIC_NOTIFIER
+		muic_notifier_register(&led_data->batt_nb,
+				ta_notification,
+				MUIC_NOTIFY_DEV_CHARGER);
+#endif
+		ret = s2mu003_led_setup(led_data);
+		if (ret < 0)
+			pr_err("%s : failed s2mu003 led reg init\n", __func__);
+	}
+	return 0;
+}
+
+static int s2mu003_led_remove(struct platform_device *pdev)
+{
+	struct s2mu003_led_data **led_datas = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i != S2MU003_LED_MAX; ++i) {
+		if (led_datas[i] == NULL)
+			continue;
+
+		if (led_datas[i]->data->id == S2MU003_TORCH_LED)
+			device_remove_file(led_datas[i]->cdev.dev,
+					&dev_attr_rear_flash);
+		cancel_work_sync(&led_datas[i]->work);
+		mutex_destroy(&led_datas[i]->lock);
+		led_classdev_unregister(&led_datas[i]->cdev);
+		kfree(led_datas[i]->data);
+		kfree(led_datas[i]);
+		kfree(global_led_datas[i]);
+	}
+	kfree(led_datas);
+
+	return 0;
+}
+
+static const struct platform_device_id s2mu003_leds_id[] = {
+	{"s2mu003-leds", 0},
+	{},
+};
+
+static struct platform_driver s2mu003_led_driver = {
+	.driver = {
+		.name  = "s2mu003-leds",
+		.owner = THIS_MODULE,
+		.of_match_table = s2mu003_fled_match_table,
+		},
+	.probe  = s2mu003_led_probe,
+	.remove = s2mu003_led_remove,
+	.id_table = s2mu003_leds_id,
+};
+
+static int __init s2mu003_led_driver_init(void)
+{
+	return platform_driver_register(&s2mu003_led_driver);
+}
+module_init(s2mu003_led_driver_init);
+
+static void __exit s2mu003_led_driver_exit(void)
+{
+	platform_driver_unregister(&s2mu003_led_driver);
+}
+module_exit(s2mu003_led_driver_exit);
+
+MODULE_AUTHOR("SUJI LEE <suji0908.lee@samsung.com>");
+MODULE_DESCRIPTION("SAMSUNG s2mu003 LED Driver");
+MODULE_LICENSE("GPL");

drivers/leds/leds-s2mu005.c

@@ -0,0 +1,758 @@
+/*
+ * leds-s2mu005.c - LED class driver for S2MU005 LEDs.
+ *
+ * Copyright (C) 2015 Samsung Electronics
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+#include <linux/leds.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/mfd/samsung/s2mu005.h>
+#include <linux/mfd/samsung/s2mu005-private.h>
+#include <linux/leds-s2mu005.h>
+#include <linux/platform_device.h>
+
+struct s2mu005_led_data *g_led_datas[S2MU005_LED_MAX];
+
+static u8 leds_cur_max[] = {
+	S2MU005_FLASH_OUT_I_1200MA,
+	S2MU005_TORCH_OUT_I_400MA,
+};
+
+static u8 leds_time_max[] = {
+	S2MU005_FLASH_TIMEOUT_992MS,
+	S2MU005_TORCH_TIMEOUT_15728MS,
+};
+
+struct s2mu005_led_data {
+	struct led_classdev cdev;
+	struct s2mu005_led *data;
+	struct notifier_block batt_nb;
+	struct i2c_client *i2c;
+	struct work_struct work;
+	struct mutex lock;
+	spinlock_t value_lock;
+	int brightness;
+	int test_brightness;
+	int attach_ta;
+	int attach_sdp;
+	bool enable;
+	int torch_pin;
+	int flash_pin;
+};
+
+u8 CH_FLASH_TORCH_EN = S2MU005_REG_FLED_RSVD;
+
+#ifdef CONFIG_MUIC_NOTIFIER
+static void attach_cable_check(muic_attached_dev_t attached_dev,
+					int *attach_ta, int *attach_sdp)
+{
+	if (attached_dev == ATTACHED_DEV_USB_MUIC)
+		*attach_sdp = 1;
+	else
+		*attach_sdp = 0;
+
+	switch (attached_dev) {
+	case ATTACHED_DEV_TA_MUIC:
+	case ATTACHED_DEV_SMARTDOCK_TA_MUIC:
+	case ATTACHED_DEV_UNOFFICIAL_TA_MUIC:
+	case ATTACHED_DEV_UNOFFICIAL_ID_TA_MUIC:
+	case ATTACHED_DEV_CDP_MUIC:
+	case ATTACHED_DEV_USB_MUIC:
+	case ATTACHED_DEV_UNOFFICIAL_ID_CDP_MUIC:
+		*attach_ta = 1;
+		break;
+	default:
+		*attach_ta = 0;
+		break;
+	}
+}
+
+static int ta_notification(struct notifier_block *nb,
+		unsigned long action, void *data)
+{
+	muic_attached_dev_t attached_dev = *(muic_attached_dev_t *)data;
+#ifdef CONFIG_S2MU005_LEDS_I2C
+	u8 temp;
+#endif
+	int ret = 0;
+	struct s2mu005_led_data *led_data =
+		container_of(nb, struct s2mu005_led_data, batt_nb);
+
+	switch (action) {
+	case MUIC_NOTIFY_CMD_DETACH:
+	case MUIC_NOTIFY_CMD_LOGICALLY_DETACH:
+		if (!led_data->attach_ta)
+			goto err;
+
+		led_data->attach_ta = 0;
+
+		if (!led_data->data->id) {
+			pr_info("%s : flash mode\n", __func__);
+			goto err;
+		}
+#ifndef CONFIG_S2MU005_LEDS_I2C
+		if (gpio_is_valid(led_data->torch_pin)) {
+			ret = devm_gpio_request(led_data->cdev.dev,
+					led_data->torch_pin, "s2mu005_gpio");
+			if (ret) {
+				pr_err("%s : fail to assignment gpio\n",
+								__func__);
+				goto gpio_free_data;
+			}
+		}
+		if (gpio_get_value(led_data->torch_pin)) {
+			gpio_direction_output(led_data->torch_pin, 0);
+			gpio_direction_output(led_data->torch_pin, 1);
+			goto gpio_free_data;
+		}
+#else
+		s2mu005_read_reg(led_data->i2c,
+				CH_FLASH_TORCH_EN, &temp);
+		if ((temp & S2MU005_TORCH_ON_I2C) == S2MU005_TORCH_ON_I2C) {
+			ret = s2mu005_update_reg(led_data->i2c,
+				CH_FLASH_TORCH_EN,
+				S2MU005_FLASH_TORCH_OFF,
+				S2MU005_TORCH_ENABLE_MASK);
+
+			pr_info("%s : LED OFF\n", __func__);
+			if (ret < 0)
+				goto err;
+			ret = s2mu005_update_reg(led_data->i2c,
+				S2MU005_REG_LED_CTRL4,
+				S2MU005_TORCH_ON_I2C,
+				S2MU005_TORCH_ENABLE_MASK);
+
+			pr_info("%s : LED ON\n", __func__);
+			if (ret < 0)
+				goto err;
+		}
+#endif
+		break;
+	case MUIC_NOTIFY_CMD_ATTACH:
+	case MUIC_NOTIFY_CMD_LOGICALLY_ATTACH:
+		led_data->attach_ta = 0;
+		attach_cable_check(attached_dev, &led_data->attach_ta,
+						&led_data->attach_sdp);
+		return 0;
+	default:
+		goto err;
+	}
+
+#ifndef CONFIG_S2MU005_LEDS_I2C
+gpio_free_data:
+	gpio_free(led_data->torch_pin);
+	pr_info("%s : gpio free\n", __func__);
+#endif
+	pr_info("%s : complete detached\n", __func__);
+	return 0;
+err:
+	pr_err("%s : abandond access %d\n", __func__, led_data->attach_ta);
+	return 0;
+}
+#endif
+
+static void led_set(struct s2mu005_led_data *led_data)
+{
+	int ret;
+	struct s2mu005_led *data = led_data->data;
+	int id = data->id;
+	u8 mask = 0, reg = 0;
+
+#ifdef CONFIG_S2MU005_LEDS_I2C
+	u8 enable_mask, value;
+#else
+	int gpio_pin;
+#endif
+	if (id == S2MU005_FLASH_LED) {
+		pr_info("%s led mode is flash\n", __func__);
+		reg = S2MU005_REG_FLED_CH1_CTRL0;
+		mask = S2MU005_FLASH_IOUT_MASK;
+#ifndef CONFIG_S2MU005_LEDS_I2C
+		pr_info("%s gpio_flash mode\n", __func__);
+		gpio_pin = led_data->flash_pin;
+#endif
+	} else {
+		pr_info("%s led mode is torch\n", __func__);
+		reg = S2MU005_REG_FLED_CH1_CTRL1;
+		mask = S2MU005_TORCH_IOUT_MASK;
+#ifndef CONFIG_S2MU005_LEDS_I2C
+		pr_info("%s gpio_torch mode\n", __func__);
+		gpio_pin = led_data->torch_pin;
+#endif
+	}
+
+
+#ifndef CONFIG_S2MU005_LEDS_I2C
+	if (gpio_is_valid(gpio_pin)) {
+		ret = devm_gpio_request(led_data->cdev.dev, gpio_pin,
+				"s2mu005_gpio");
+		if (ret) {
+			pr_err("%s : fail to assignment gpio\n", __func__);
+			goto gpio_free_data;
+		}
+	}
+#endif
+	pr_info("%s start led_set\n", __func__);
+
+	if (led_data->test_brightness == LED_OFF) {
+		ret = s2mu005_update_reg(led_data->i2c, reg,
+				led_data->test_brightness, mask);
+		if (ret < 0)
+			goto error_set_bits;
+
+#ifdef CONFIG_S2MU005_LEDS_I2C
+		value = S2MU005_FLASH_TORCH_OFF;
+#else
+		gpio_direction_output(gpio_pin, 0);
+#endif
+		/* torch mode off sequence */
+		if (id && led_data->attach_ta) {
+			ret = s2mu005_update_reg(led_data->i2c,
+				S2MU005_REG_FLED_CTRL1, 0x00, 0x80);
+			if (ret < 0)
+				goto error_set_bits;
+		}
+#ifndef CONFIG_S2MU005_LEDS_I2C
+		goto gpio_free_data;
+#endif
+	} else {
+		pr_info("%s led on\n", __func__);
+		/* torch mode on sequence */
+		if (id && led_data->attach_ta) {
+			ret = s2mu005_update_reg(led_data->i2c,
+				S2MU005_REG_FLED_CTRL1, 0x80, 0x80);
+			if (ret < 0)
+				goto error_set_bits;
+			/* ta attach & sdp mode :  brightness limit 300mA */
+			if (led_data->attach_sdp)
+				led_data->test_brightness =
+				(led_data->test_brightness > S2MU005_TORCH_OUT_I_300MA) ?
+				S2MU005_TORCH_OUT_I_300MA : led_data->test_brightness;
+		}
+		pr_info("%s led brightness = %d\n", __func__,
+						 led_data->test_brightness);
+		ret = s2mu005_update_reg(led_data->i2c,
+				reg, led_data->test_brightness, mask);
+		if (ret < 0)
+			goto error_set_bits;
+
+#ifdef CONFIG_S2MU005_LEDS_I2C
+		value = id ? S2MU005_TORCH_ON_I2C : S2MU005_FLASH_ON_I2C;
+#else
+		gpio_direction_output(gpio_pin, 1);
+		goto gpio_free_data;
+
+#endif
+	}
+#ifdef CONFIG_S2MU005_LEDS_I2C
+	enable_mask = id ? S2MU005_TORCH_ENABLE_MASK :
+		S2MU005_FLASH_ENABLE_MASK;
+
+	ret = s2mu005_update_reg(led_data->i2c,
+		CH_FLASH_TORCH_EN,
+		value, enable_mask);
+
+	if (ret < 0)
+		goto error_set_bits;
+#endif
+	return;
+
+#ifndef CONFIG_S2MU005_LEDS_I2C
+gpio_free_data:
+	gpio_free(gpio_pin);
+	pr_info("%s : gpio free\n", __func__);
+	return;
+#endif
+error_set_bits:
+	pr_err("%s: can't set led level %d\n", __func__, ret);
+}
+
+static void s2mu005_led_set(struct led_classdev *led_cdev,
+			enum led_brightness value)
+{
+	unsigned long flags;
+	struct s2mu005_led_data *led_data =
+		container_of(led_cdev, struct s2mu005_led_data, cdev);
+	u8 max;
+
+	max = led_cdev->max_brightness;
+
+	pr_info("%s value = %d, max = %d\n", __func__, value, max);
+
+	spin_lock_irqsave(&led_data->value_lock, flags);
+	led_data->test_brightness = min_t(int, (int)value, (int)max);
+	spin_unlock_irqrestore(&led_data->value_lock, flags);
+
+	led_set(led_data);
+}
+
+static void s2mu005_led_work(struct work_struct *work)
+{
+	struct s2mu005_led_data *led_data
+		= container_of(work, struct s2mu005_led_data, work);
+
+	pr_debug("%s [led]\n", __func__);
+
+	mutex_lock(&led_data->lock);
+	led_set(led_data);
+	mutex_unlock(&led_data->lock);
+}
+
+static int s2mu005_led_setup(struct s2mu005_led_data *led_data)
+{
+	int ret = 0;
+	int mask, value;
+	u8 temp;
+
+	/* EVT0 0x73[3:0] == 0x0 */
+	ret = s2mu005_read_reg(led_data->i2c, 0x73, &temp);
+	if (ret < 0)
+		goto out;
+
+	if ((temp & 0xf) == 0x00) {
+		/* forced BATID recognition 0x89[1:0] = 0x3 */
+		ret = s2mu005_update_reg(led_data->i2c, 0x89, 0x03, 0x03);
+		if (ret < 0)
+			goto out;
+		ret = s2mu005_update_reg(led_data->i2c, 0x92, 0x80, 0x80);
+		if (ret < 0)
+			goto out;
+	}
+
+	/* Controlled Channel1, Channel2 independently */
+	ret = s2mu005_update_reg(led_data->i2c, S2MU005_REG_FLED_CTRL2,
+			0x00, S2MU005_EN_CHANNEL_SHARE_MASK);
+	if (ret < 0)
+		goto out;
+
+	/* Boost vout flash 4.5V */
+	ret = s2mu005_update_reg(led_data->i2c, S2MU005_REG_FLED_CTRL2,
+			0x0A, S2MU005_BOOST_VOUT_FLASH_MASK);
+	if (ret < 0)
+		goto out;
+
+	/* FLED_BOOST_EN */
+	ret = s2mu005_update_reg(led_data->i2c, S2MU005_REG_FLED_CTRL1,
+			0x40, S2MU005_FLASH_BOOST_EN_MASK);
+	if (ret < 0)
+		goto out;
+
+	/* Flash timer Maximum mode */
+	ret = s2mu005_update_reg(led_data->i2c,
+			S2MU005_REG_FLED_CH1_CTRL3, 0x80, 0x80);
+	if (ret < 0)
+		goto out;
+
+	if (led_data->data->id == S2MU005_FLASH_LED) {
+		/* flash timer Maximum set */
+		ret = s2mu005_update_reg(led_data->i2c,
+			S2MU005_REG_FLED_CH1_CTRL3, led_data->data->timeout,
+			S2MU005_TIMEOUT_MAX);
+		if (ret < 0)
+			goto out;
+	} else {
+		/* torch timer Maximum set */
+		ret = s2mu005_update_reg(led_data->i2c,
+			S2MU005_REG_FLED_CH1_CTRL2, led_data->data->timeout,
+			S2MU005_TIMEOUT_MAX);
+		if (ret < 0)
+			goto out;
+	}
+
+	/* flash brightness set */
+	ret = s2mu005_update_reg(led_data->i2c, S2MU005_REG_FLED_CH1_CTRL0,
+			S2MU005_FLASH_OUT_I_1000MA, S2MU005_FLASH_IOUT_MASK);
+	if (ret < 0)
+		goto out;
+
+	/* torch brightness set */
+	ret = s2mu005_update_reg(led_data->i2c, S2MU005_REG_FLED_CH1_CTRL1,
+			S2MU005_TORCH_OUT_I_75MA, S2MU005_TORCH_IOUT_MASK);
+	if (ret < 0)
+		goto out;
+
+#ifdef CONFIG_S2MU005_LEDS_I2C
+	value =	S2MU005_FLASH_TORCH_OFF;
+#else
+	value = S2MU005_FLASH_ON_GPIO | S2MU005_TORCH_ON_GPIO;
+#endif
+	mask = S2MU005_TORCH_ENABLE_MASK | S2MU005_FLASH_ENABLE_MASK;
+	ret = s2mu005_update_reg(led_data->i2c, CH_FLASH_TORCH_EN,
+		value, mask);
+	if (ret < 0)
+		goto out;
+	pr_info("%s : led setup complete\n", __func__);
+	return ret;
+
+out:
+	pr_err("%s : led setup fail\n", __func__);
+	return ret;
+}
+
+static ssize_t rear_flash_show(struct device *dev,
+				struct device_attribute *attr, char *buf)
+{
+	struct s2mu005_led_data *led_data = g_led_datas[S2MU005_TORCH_LED];
+	char *str;
+
+	switch (led_data->data->id) {
+	case S2MU005_FLASH_LED:
+		str = "FLASH";
+		break;
+	case S2MU005_TORCH_LED:
+		str = "TORCH";
+		break;
+	default:
+		str = "NONE";
+		break;
+	}
+
+	return snprintf(buf, 20, "%s\n", str);
+}
+
+static ssize_t rear_flash_store(struct device *dev,
+				struct device_attribute *attr,
+				const char *buf, size_t size)
+{
+	struct s2mu005_led_data *led_data = g_led_datas[S2MU005_TORCH_LED];
+	struct led_classdev *led_cdev = &led_data->cdev;
+	int value = 0;
+	int brightness = 0;
+
+	if ((buf == NULL) || kstrtouint(buf, 10, &value)) {
+		return -1;
+	}
+
+	pr_info("[LED]%s , value:%d\n", __func__, value);
+	mutex_lock(&led_data->lock);
+
+	if (led_data->data->id == S2MU005_FLASH_LED) {
+		pr_info("%s : flash is not controlled by sysfs", __func__);
+		goto err;
+	}
+
+	if (value == 0) {
+		/* Turn off Torch */
+		brightness = LED_OFF;
+	} else if (value == 1) {
+		/* Turn on Torch */
+		brightness = value;
+	} else {
+		pr_info("[LED]%s , Invalid value:%d\n", __func__, value);
+		goto err;
+	}
+
+	if (led_cdev->flags & LED_SUSPENDED) {
+		pr_info("%s : led suspended\n", __func__);
+		goto err;
+	}
+
+	s2mu005_led_set(led_cdev, brightness);
+
+	mutex_unlock(&led_data->lock);
+	return size;
+
+err:
+	pr_err("%s : led abnormal end\n", __func__);
+
+	mutex_unlock(&led_data->lock);
+	return size;
+}
+
+static DEVICE_ATTR(rear_flash, 0644, rear_flash_show, rear_flash_store);
+
+#if defined(CONFIG_OF)
+static int s2mu005_led_dt_parse_pdata(struct s2mu005_dev *iodev,
+				struct s2mu005_fled_platform_data *pdata)
+{
+	struct device_node *led_np, *np, *c_np;
+	int ret;
+	u32 temp;
+	const char *temp_str;
+	int index;
+
+	led_np = iodev->dev->of_node;
+
+	if (!led_np) {
+		pr_err("<%s> could not find led sub-node led_np\n", __func__);
+		return -ENODEV;
+	}
+
+	np = of_find_node_by_name(led_np, "leds");
+	if (!np) {
+		pr_err("%s : could not find led sub-node np\n", __func__);
+		return -EINVAL;
+	}
+
+	ret = pdata->torch_pin = of_get_named_gpio(np, "torch-gpio", 0);
+	if (ret < 0) {
+		pr_err("%s : can't get torch-gpio\n", __func__);
+		return ret;
+	}
+
+	ret = pdata->flash_pin = of_get_named_gpio(np, "flash-gpio", 0);
+	if (ret < 0) {
+		pr_err("%s : can't get flash-gpio\n", __func__);
+		return ret;
+	}
+
+	pdata->num_leds = of_get_child_count(np);
+
+	for_each_child_of_node(np, c_np) {
+		ret = of_property_read_u32(c_np, "id", &temp);
+		if (ret < 0)
+			goto dt_err;
+		index = temp;
+		pdata->leds[index].id = temp;
+
+		ret = of_property_read_string(c_np, "ledname", &temp_str);
+		if (ret)
+			goto dt_err;
+		pdata->leds[index].name = temp_str;
+
+		ret = of_property_read_u32(c_np, "brightness", &temp);
+		if (ret)
+			goto dt_err;
+		if (temp > leds_cur_max[index])
+			temp = leds_cur_max[index];
+		pdata->leds[index].brightness = temp;
+
+		ret = of_property_read_u32(c_np, "timeout", &temp);
+		if (ret)
+			goto dt_err;
+		if (temp > leds_time_max[index])
+			temp = leds_time_max[index];
+		pdata->leds[index].timeout = temp;
+	}
+	return 0;
+dt_err:
+	pr_err("%s failed to get a timeout\n", __func__);
+	return ret;
+}
+#endif /* CONFIG_OF */
+
+static int s2mu005_led_probe(struct platform_device *pdev)
+{
+	int ret = 0, i = 0;
+	u8 temp = 0;
+
+	struct s2mu005_dev *s2mu005 = dev_get_drvdata(pdev->dev.parent);
+#ifndef CONFIG_OF
+	struct s2mu005_mfd_platform_data *s2mu005_pdata = s2mu005->pdata;
+#endif
+	struct s2mu005_fled_platform_data *pdata;
+	struct s2mu005_led_data *led_data;
+	struct s2mu005_led *data;
+	struct s2mu005_led_data **led_datas;
+
+	pr_info("[%s] s2mu005_fled start\n", __func__);
+
+	if (!s2mu005) {
+		dev_err(&pdev->dev, "drvdata->dev.parent not supplied\n");
+		return -ENODEV;
+	}
+#ifdef CONFIG_OF
+	pdata = kzalloc(sizeof(struct s2mu005_fled_platform_data), GFP_KERNEL);
+	if (!pdata) {
+		pr_err("[%s] failed to allocate driver data\n", __func__);
+		return -ENOMEM;
+	}
+
+	if (s2mu005->dev->of_node) {
+		ret = s2mu005_led_dt_parse_pdata(s2mu005, pdata);
+		if (ret < 0) {
+			pr_err("[%s] not found leds dt! ret[%d]\n",
+				__func__, ret);
+			kfree(pdata);
+			return -1;
+		}
+	}
+#else
+	if (!s2mu005_pdata) {
+		dev_err(&pdev->dev, "platform data not supplied\n");
+		return -ENODEV;
+	}
+	pdata = s2mu005_pdata->fled_platform_data;
+	if (!pdata) {
+		pr_err("[%s] no platform data for this led is found\n",
+				__func__);
+		return -EFAULT;
+	}
+#endif
+
+	led_datas = devm_kzalloc(s2mu005->dev,
+			sizeof(struct s2mu005_led_data *) *
+			S2MU005_LED_MAX, GFP_KERNEL);
+	if (!led_datas) {
+		pr_err("[%s] memory allocation error led_datas", __func__);
+		kfree(pdata);
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, led_datas);
+
+	pr_info("%s %d leds\n", __func__, pdata->num_leds);
+
+	for (i = 0; i != pdata->num_leds; ++i) {
+		pr_info("%s led%d setup ...\n", __func__, i);
+
+		data = devm_kzalloc(s2mu005->dev, sizeof(struct s2mu005_led),
+				GFP_KERNEL);
+		if (!data) {
+			pr_err("[%s] memory allocation error data\n",
+					__func__);
+			ret = -ENOMEM;
+			continue;
+		}
+
+		memcpy(data, &(pdata->leds[i]), sizeof(struct s2mu005_led));
+		led_data = devm_kzalloc(&pdev->dev,
+				sizeof(struct s2mu005_led_data), GFP_KERNEL);
+
+		g_led_datas[i] = led_data;
+		led_datas[i] = led_data;
+
+		if (!led_data) {
+			pr_err("[%s] memory allocation error led_data\n",
+					__func__);
+			kfree(data);
+			ret = -ENOMEM;
+			continue;
+		}
+
+		led_data->i2c = s2mu005->i2c;
+		led_data->data = data;
+		led_data->cdev.name = data->name;
+		led_data->cdev.brightness_set = s2mu005_led_set;
+		led_data->cdev.flags = 0;
+		led_data->cdev.brightness = data->brightness;
+		led_data->cdev.max_brightness = led_data->data->id ?
+		S2MU005_TORCH_OUT_I_400MA : S2MU005_FLASH_OUT_I_1200MA;
+
+		mutex_init(&led_data->lock);
+		spin_lock_init(&led_data->value_lock);
+		INIT_WORK(&led_data->work, s2mu005_led_work);
+		ret = led_classdev_register(&pdev->dev, &led_data->cdev);
+		if (ret < 0) {
+			pr_err("unable to register LED\n");
+			cancel_work_sync(&led_data->work);
+			mutex_destroy(&led_data->lock);
+			kfree(data);
+			kfree(led_data);
+			led_datas[i] = NULL;
+			g_led_datas[i] = NULL;
+			ret = -EFAULT;
+			continue;
+		}
+		if (led_data->data->id == S2MU005_TORCH_LED) {
+			ret = device_create_file(led_data->cdev.dev,
+					&dev_attr_rear_flash);
+			if (ret < 0)
+				pr_err("%s :unable to create file\n", __func__);
+		}
+#ifndef CONFIG_S2MU005_LEDS_I2C
+		if (gpio_is_valid(pdata->torch_pin) &&
+				gpio_is_valid(pdata->flash_pin)) {
+			if (ret < 0) {
+				pr_err("%s : s2mu005 fled gpio allocation error\n",
+					__func__);
+			} else {
+				led_data->torch_pin = pdata->torch_pin;
+				led_data->flash_pin = pdata->flash_pin;
+				gpio_request_one(pdata->torch_pin,
+				GPIOF_OUT_INIT_LOW, "LED_GPIO_OUTPUT_LOW");
+				gpio_request_one(pdata->flash_pin,
+				GPIOF_OUT_INIT_LOW, "LED_GPIO_OUTPUT_LOW");
+				gpio_free(pdata->torch_pin);
+				gpio_free(pdata->flash_pin);
+			}
+		}
+#endif
+		/* EVT0 0x73[3:0] == 0x0 */
+		ret = s2mu005_read_reg(led_data->i2c, 0x73, &temp);
+		if (ret < 0)
+			pr_err("%s : s2mu005 reg fled read fail\n", __func__);
+
+		if ((temp & 0xf) == 0x00) {
+			/* FLED_CTRL4 = 0x3A */
+			CH_FLASH_TORCH_EN = S2MU005_REG_FLED_CTRL4;
+		}
+
+#ifdef CONFIG_MUIC_NOTIFIER
+		muic_notifier_register(&led_data->batt_nb,
+				ta_notification,
+				MUIC_NOTIFY_DEV_CHARGER);
+#endif
+		ret = s2mu005_led_setup(led_data);
+		if (ret < 0)
+			pr_err("%s : failed s2mu005 led reg init\n", __func__);
+	}
+#ifdef CONFIG_OF
+	kfree(pdata);
+#endif
+	return 0;
+}
+
+static int s2mu005_led_remove(struct platform_device *pdev)
+{
+	struct s2mu005_led_data **led_datas = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i != S2MU005_LED_MAX; ++i) {
+		if (led_datas[i] == NULL)
+			continue;
+
+		cancel_work_sync(&led_datas[i]->work);
+		mutex_destroy(&led_datas[i]->lock);
+		led_classdev_unregister(&led_datas[i]->cdev);
+		kfree(led_datas[i]->data);
+		kfree(led_datas[i]);
+		g_led_datas[i] = NULL;
+	}
+	kfree(led_datas);
+
+	return 0;
+}
+
+static const struct platform_device_id s2mu005_leds_id[] = {
+	{"s2mu005-flash", 0},
+	{},
+};
+
+static struct platform_driver s2mu005_led_driver = {
+	.driver = {
+		.name  = "s2mu005-flash",
+		.owner = THIS_MODULE,
+		},
+	.probe  = s2mu005_led_probe,
+	.remove = s2mu005_led_remove,
+	.id_table = s2mu005_leds_id,
+};
+
+static int __init s2mu005_led_driver_init(void)
+{
+	return platform_driver_register(&s2mu005_led_driver);
+}
+module_init(s2mu005_led_driver_init);
+
+static void __exit s2mu005_led_driver_exit(void)
+{
+	platform_driver_unregister(&s2mu005_led_driver);
+}
+module_exit(s2mu005_led_driver_exit);
+
+MODULE_AUTHOR("SUJI LEE <suji0908.lee@samsung.com>");
+MODULE_DESCRIPTION("SAMSUNG s2mu005 LED Driver");
+MODULE_LICENSE("GPL");

drivers/leds/leds-s3c24xx.c

@@ -0,0 +1,128 @@
+/* drivers/leds/leds-s3c24xx.c
+ *
+ * (c) 2006 Simtec Electronics
+ *	http://armlinux.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C24XX - LEDs GPIO driver
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/platform_data/leds-s3c24xx.h>
+
+#include <mach/regs-gpio.h>
+#include <plat/gpio-cfg.h>
+
+/* our context */
+
+struct s3c24xx_gpio_led {
+	struct led_classdev		 cdev;
+	struct s3c24xx_led_platdata	*pdata;
+};
+
+static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev)
+{
+	return platform_get_drvdata(dev);
+}
+
+static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
+{
+	return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
+}
+
+static void s3c24xx_led_set(struct led_classdev *led_cdev,
+			    enum led_brightness value)
+{
+	struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
+	struct s3c24xx_led_platdata *pd = led->pdata;
+	int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);
+
+	/* there will be a short delay between setting the output and
+	 * going from output to input when using tristate. */
+
+	gpio_set_value(pd->gpio, state);
+
+	if (pd->flags & S3C24XX_LEDF_TRISTATE) {
+		if (value)
+			gpio_direction_output(pd->gpio, state);
+		else
+			gpio_direction_input(pd->gpio);
+	}
+}
+
+static int s3c24xx_led_remove(struct platform_device *dev)
+{
+	struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
+
+	led_classdev_unregister(&led->cdev);
+
+	return 0;
+}
+
+static int s3c24xx_led_probe(struct platform_device *dev)
+{
+	struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
+	struct s3c24xx_gpio_led *led;
+	int ret;
+
+	led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
+			   GFP_KERNEL);
+	if (!led)
+		return -ENOMEM;
+
+	platform_set_drvdata(dev, led);
+
+	led->cdev.brightness_set = s3c24xx_led_set;
+	led->cdev.default_trigger = pdata->def_trigger;
+	led->cdev.name = pdata->name;
+	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
+
+	led->pdata = pdata;
+
+	ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
+	if (ret < 0)
+		return ret;
+
+	/* no point in having a pull-up if we are always driving */
+
+	s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
+
+	if (pdata->flags & S3C24XX_LEDF_TRISTATE)
+		gpio_direction_input(pdata->gpio);
+	else
+		gpio_direction_output(pdata->gpio,
+			pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);
+
+	/* register our new led device */
+
+	ret = led_classdev_register(&dev->dev, &led->cdev);
+	if (ret < 0)
+		dev_err(&dev->dev, "led_classdev_register failed\n");
+
+	return ret;
+}
+
+static struct platform_driver s3c24xx_led_driver = {
+	.probe		= s3c24xx_led_probe,
+	.remove		= s3c24xx_led_remove,
+	.driver		= {
+		.name		= "s3c24xx_led",
+		.owner		= THIS_MODULE,
+	},
+};
+
+module_platform_driver(s3c24xx_led_driver);
+
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("S3C24XX LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:s3c24xx_led");

drivers/leds/leds-ss4200.c

@@ -0,0 +1,560 @@
+/*
+ * SS4200-E Hardware API
+ * Copyright (c) 2009, Intel Corporation.
+ * Copyright IBM Corporation, 2009
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Author: Dave Hansen <dave@sr71.net>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/dmi.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/kernel.h>
+#include <linux/leds.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+
+MODULE_AUTHOR("Rodney Girod <rgirod@confocus.com>, Dave Hansen <dave@sr71.net>");
+MODULE_DESCRIPTION("Intel NAS/Home Server ICH7 GPIO Driver");
+MODULE_LICENSE("GPL");
+
+/*
+ * ICH7 LPC/GPIO PCI Config register offsets
+ */
+#define PMBASE		0x040
+#define GPIO_BASE	0x048
+#define GPIO_CTRL	0x04c
+#define GPIO_EN		0x010
+
+/*
+ * The ICH7 GPIO register block is 64 bytes in size.
+ */
+#define ICH7_GPIO_SIZE	64
+
+/*
+ * Define register offsets within the ICH7 register block.
+ */
+#define GPIO_USE_SEL	0x000
+#define GP_IO_SEL	0x004
+#define GP_LVL		0x00c
+#define GPO_BLINK	0x018
+#define GPI_INV		0x030
+#define GPIO_USE_SEL2	0x034
+#define GP_IO_SEL2	0x038
+#define GP_LVL2		0x03c
+
+/*
+ * PCI ID of the Intel ICH7 LPC Device within which the GPIO block lives.
+ */
+static const struct pci_device_id ich7_lpc_pci_id[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_0) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_1) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH7_30) },
+	{ } /* NULL entry */
+};
+
+MODULE_DEVICE_TABLE(pci, ich7_lpc_pci_id);
+
+static int __init ss4200_led_dmi_callback(const struct dmi_system_id *id)
+{
+	pr_info("detected '%s'\n", id->ident);
+	return 1;
+}
+
+static bool nodetect;
+module_param_named(nodetect, nodetect, bool, 0);
+MODULE_PARM_DESC(nodetect, "Skip DMI-based hardware detection");
+
+/*
+ * struct nas_led_whitelist - List of known good models
+ *
+ * Contains the known good models this driver is compatible with.
+ * When adding a new model try to be as strict as possible. This
+ * makes it possible to keep the false positives (the model is
+ * detected as working, but in reality it is not) as low as
+ * possible.
+ */
+static struct dmi_system_id nas_led_whitelist[] __initdata = {
+	{
+		.callback = ss4200_led_dmi_callback,
+		.ident = "Intel SS4200-E",
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Intel"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "SS4200-E"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "1.00.00")
+		}
+	},
+	{}
+};
+
+/*
+ * Base I/O address assigned to the Power Management register block
+ */
+static u32 g_pm_io_base;
+
+/*
+ * Base I/O address assigned to the ICH7 GPIO register block
+ */
+static u32 nas_gpio_io_base;
+
+/*
+ * When we successfully register a region, we are returned a resource.
+ * We use these to identify which regions we need to release on our way
+ * back out.
+ */
+static struct resource *gp_gpio_resource;
+
+struct nasgpio_led {
+	char *name;
+	u32 gpio_bit;
+	struct led_classdev led_cdev;
+};
+
+/*
+ * gpio_bit(s) are the ICH7 GPIO bit assignments
+ */
+static struct nasgpio_led nasgpio_leds[] = {
+	{ .name = "hdd1:blue:sata",	.gpio_bit = 0 },
+	{ .name = "hdd1:amber:sata",	.gpio_bit = 1 },
+	{ .name = "hdd2:blue:sata",	.gpio_bit = 2 },
+	{ .name = "hdd2:amber:sata",	.gpio_bit = 3 },
+	{ .name = "hdd3:blue:sata",	.gpio_bit = 4 },
+	{ .name = "hdd3:amber:sata",	.gpio_bit = 5 },
+	{ .name = "hdd4:blue:sata",	.gpio_bit = 6 },
+	{ .name = "hdd4:amber:sata",	.gpio_bit = 7 },
+	{ .name = "power:blue:power",	.gpio_bit = 27},
+	{ .name = "power:amber:power",  .gpio_bit = 28},
+};
+
+#define NAS_RECOVERY	0x00000400	/* GPIO10 */
+
+static struct nasgpio_led *
+led_classdev_to_nasgpio_led(struct led_classdev *led_cdev)
+{
+	return container_of(led_cdev, struct nasgpio_led, led_cdev);
+}
+
+static struct nasgpio_led *get_led_named(char *name)
+{
+	int i;
+	for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++) {
+		if (strcmp(nasgpio_leds[i].name, name))
+			continue;
+		return &nasgpio_leds[i];
+	}
+	return NULL;
+}
+
+/*
+ * This protects access to the gpio ports.
+ */
+static DEFINE_SPINLOCK(nasgpio_gpio_lock);
+
+/*
+ * There are two gpio ports, one for blinking and the other
+ * for power.  @port tells us if we're doing blinking or
+ * power control.
+ *
+ * Caller must hold nasgpio_gpio_lock
+ */
+static void __nasgpio_led_set_attr(struct led_classdev *led_cdev,
+				   u32 port, u32 value)
+{
+	struct nasgpio_led *led = led_classdev_to_nasgpio_led(led_cdev);
+	u32 gpio_out;
+
+	gpio_out = inl(nas_gpio_io_base + port);
+	if (value)
+		gpio_out |= (1<<led->gpio_bit);
+	else
+		gpio_out &= ~(1<<led->gpio_bit);
+
+	outl(gpio_out, nas_gpio_io_base + port);
+}
+
+static void nasgpio_led_set_attr(struct led_classdev *led_cdev,
+				 u32 port, u32 value)
+{
+	spin_lock(&nasgpio_gpio_lock);
+	__nasgpio_led_set_attr(led_cdev, port, value);
+	spin_unlock(&nasgpio_gpio_lock);
+}
+
+static u32 nasgpio_led_get_attr(struct led_classdev *led_cdev, u32 port)
+{
+	struct nasgpio_led *led = led_classdev_to_nasgpio_led(led_cdev);
+	u32 gpio_in;
+
+	spin_lock(&nasgpio_gpio_lock);
+	gpio_in = inl(nas_gpio_io_base + port);
+	spin_unlock(&nasgpio_gpio_lock);
+	if (gpio_in & (1<<led->gpio_bit))
+		return 1;
+	return 0;
+}
+
+/*
+ * There is actual brightness control in the hardware,
+ * but it is via smbus commands and not implemented
+ * in this driver.
+ */
+static void nasgpio_led_set_brightness(struct led_classdev *led_cdev,
+				       enum led_brightness brightness)
+{
+	u32 setting = 0;
+	if (brightness >= LED_HALF)
+		setting = 1;
+	/*
+	 * Hold the lock across both operations.  This ensures
+	 * consistency so that both the "turn off blinking"
+	 * and "turn light off" operations complete as a set.
+	 */
+	spin_lock(&nasgpio_gpio_lock);
+	/*
+	 * LED class documentation asks that past blink state
+	 * be disabled when brightness is turned to zero.
+	 */
+	if (brightness == 0)
+		__nasgpio_led_set_attr(led_cdev, GPO_BLINK, 0);
+	__nasgpio_led_set_attr(led_cdev, GP_LVL, setting);
+	spin_unlock(&nasgpio_gpio_lock);
+}
+
+static int nasgpio_led_set_blink(struct led_classdev *led_cdev,
+				 unsigned long *delay_on,
+				 unsigned long *delay_off)
+{
+	u32 setting = 1;
+	if (!(*delay_on == 0 && *delay_off == 0) &&
+	    !(*delay_on == 500 && *delay_off == 500))
+		return -EINVAL;
+	/*
+	 * These are very approximate.
+	 */
+	*delay_on = 500;
+	*delay_off = 500;
+
+	nasgpio_led_set_attr(led_cdev, GPO_BLINK, setting);
+
+	return 0;
+}
+
+
+/*
+ * Initialize the ICH7 GPIO registers for NAS usage.  The BIOS should have
+ * already taken care of this, but we will do so in a non destructive manner
+ * so that we have what we need whether the BIOS did it or not.
+ */
+static int ich7_gpio_init(struct device *dev)
+{
+	int i;
+	u32 config_data = 0;
+	u32 all_nas_led = 0;
+
+	for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++)
+		all_nas_led |= (1<<nasgpio_leds[i].gpio_bit);
+
+	spin_lock(&nasgpio_gpio_lock);
+	/*
+	 * We need to enable all of the GPIO lines used by the NAS box,
+	 * so we will read the current Use Selection and add our usage
+	 * to it.  This should be benign with regard to the original
+	 * BIOS configuration.
+	 */
+	config_data = inl(nas_gpio_io_base + GPIO_USE_SEL);
+	dev_dbg(dev, ": Data read from GPIO_USE_SEL = 0x%08x\n", config_data);
+	config_data |= all_nas_led + NAS_RECOVERY;
+	outl(config_data, nas_gpio_io_base + GPIO_USE_SEL);
+	config_data = inl(nas_gpio_io_base + GPIO_USE_SEL);
+	dev_dbg(dev, ": GPIO_USE_SEL = 0x%08x\n\n", config_data);
+
+	/*
+	 * The LED GPIO outputs need to be configured for output, so we
+	 * will ensure that all LED lines are cleared for output and the
+	 * RECOVERY line ready for input.  This too should be benign with
+	 * regard to BIOS configuration.
+	 */
+	config_data = inl(nas_gpio_io_base + GP_IO_SEL);
+	dev_dbg(dev, ": Data read from GP_IO_SEL = 0x%08x\n",
+					config_data);
+	config_data &= ~all_nas_led;
+	config_data |= NAS_RECOVERY;
+	outl(config_data, nas_gpio_io_base + GP_IO_SEL);
+	config_data = inl(nas_gpio_io_base + GP_IO_SEL);
+	dev_dbg(dev, ": GP_IO_SEL = 0x%08x\n", config_data);
+
+	/*
+	 * In our final system, the BIOS will initialize the state of all
+	 * of the LEDs.  For now, we turn them all off (or Low).
+	 */
+	config_data = inl(nas_gpio_io_base + GP_LVL);
+	dev_dbg(dev, ": Data read from GP_LVL = 0x%08x\n", config_data);
+	/*
+	 * In our final system, the BIOS will initialize the blink state of all
+	 * of the LEDs.  For now, we turn blink off for all of them.
+	 */
+	config_data = inl(nas_gpio_io_base + GPO_BLINK);
+	dev_dbg(dev, ": Data read from GPO_BLINK = 0x%08x\n", config_data);
+
+	/*
+	 * At this moment, I am unsure if anything needs to happen with GPI_INV
+	 */
+	config_data = inl(nas_gpio_io_base + GPI_INV);
+	dev_dbg(dev, ": Data read from GPI_INV = 0x%08x\n", config_data);
+
+	spin_unlock(&nasgpio_gpio_lock);
+	return 0;
+}
+
+static void ich7_lpc_cleanup(struct device *dev)
+{
+	/*
+	 * If we were given exclusive use of the GPIO
+	 * I/O Address range, we must return it.
+	 */
+	if (gp_gpio_resource) {
+		dev_dbg(dev, ": Releasing GPIO I/O addresses\n");
+		release_region(nas_gpio_io_base, ICH7_GPIO_SIZE);
+		gp_gpio_resource = NULL;
+	}
+}
+
+/*
+ * The OS has determined that the LPC of the Intel ICH7 Southbridge is present
+ * so we can retrive the required operational information and prepare the GPIO.
+ */
+static struct pci_dev *nas_gpio_pci_dev;
+static int ich7_lpc_probe(struct pci_dev *dev,
+				    const struct pci_device_id *id)
+{
+	int status;
+	u32 gc = 0;
+
+	status = pci_enable_device(dev);
+	if (status) {
+		dev_err(&dev->dev, "pci_enable_device failed\n");
+		return -EIO;
+	}
+
+	nas_gpio_pci_dev = dev;
+	status = pci_read_config_dword(dev, PMBASE, &g_pm_io_base);
+	if (status)
+		goto out;
+	g_pm_io_base &= 0x00000ff80;
+
+	status = pci_read_config_dword(dev, GPIO_CTRL, &gc);
+	if (!(GPIO_EN & gc)) {
+		status = -EEXIST;
+		dev_info(&dev->dev,
+			   "ERROR: The LPC GPIO Block has not been enabled.\n");
+		goto out;
+	}
+
+	status = pci_read_config_dword(dev, GPIO_BASE, &nas_gpio_io_base);
+	if (0 > status) {
+		dev_info(&dev->dev, "Unable to read GPIOBASE.\n");
+		goto out;
+	}
+	dev_dbg(&dev->dev, ": GPIOBASE = 0x%08x\n", nas_gpio_io_base);
+	nas_gpio_io_base &= 0x00000ffc0;
+
+	/*
+	 * Insure that we have exclusive access to the GPIO I/O address range.
+	 */
+	gp_gpio_resource = request_region(nas_gpio_io_base, ICH7_GPIO_SIZE,
+					  KBUILD_MODNAME);
+	if (NULL == gp_gpio_resource) {
+		dev_info(&dev->dev,
+			 "ERROR Unable to register GPIO I/O addresses.\n");
+		status = -1;
+		goto out;
+	}
+
+	/*
+	 * Initialize the GPIO for NAS/Home Server Use
+	 */
+	ich7_gpio_init(&dev->dev);
+
+out:
+	if (status) {
+		ich7_lpc_cleanup(&dev->dev);
+		pci_disable_device(dev);
+	}
+	return status;
+}
+
+static void ich7_lpc_remove(struct pci_dev *dev)
+{
+	ich7_lpc_cleanup(&dev->dev);
+	pci_disable_device(dev);
+}
+
+/*
+ * pci_driver structure passed to the PCI modules
+ */
+static struct pci_driver nas_gpio_pci_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = ich7_lpc_pci_id,
+	.probe = ich7_lpc_probe,
+	.remove = ich7_lpc_remove,
+};
+
+static struct led_classdev *get_classdev_for_led_nr(int nr)
+{
+	struct nasgpio_led *nas_led = &nasgpio_leds[nr];
+	struct led_classdev *led = &nas_led->led_cdev;
+	return led;
+}
+
+
+static void set_power_light_amber_noblink(void)
+{
+	struct nasgpio_led *amber = get_led_named("power:amber:power");
+	struct nasgpio_led *blue = get_led_named("power:blue:power");
+
+	if (!amber || !blue)
+		return;
+	/*
+	 * LED_OFF implies disabling future blinking
+	 */
+	pr_debug("setting blue off and amber on\n");
+
+	nasgpio_led_set_brightness(&blue->led_cdev, LED_OFF);
+	nasgpio_led_set_brightness(&amber->led_cdev, LED_FULL);
+}
+
+static ssize_t nas_led_blink_show(struct device *dev,
+				  struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led = dev_get_drvdata(dev);
+	int blinking = 0;
+	if (nasgpio_led_get_attr(led, GPO_BLINK))
+		blinking = 1;
+	return sprintf(buf, "%u\n", blinking);
+}
+
+static ssize_t nas_led_blink_store(struct device *dev,
+				   struct device_attribute *attr,
+				   const char *buf, size_t size)
+{
+	int ret;
+	struct led_classdev *led = dev_get_drvdata(dev);
+	unsigned long blink_state;
+
+	ret = kstrtoul(buf, 10, &blink_state);
+	if (ret)
+		return ret;
+
+	nasgpio_led_set_attr(led, GPO_BLINK, blink_state);
+
+	return size;
+}
+
+static DEVICE_ATTR(blink, 0644, nas_led_blink_show, nas_led_blink_store);
+
+static struct attribute *nasgpio_led_attrs[] = {
+	&dev_attr_blink.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(nasgpio_led);
+
+static int register_nasgpio_led(int led_nr)
+{
+	int ret;
+	struct nasgpio_led *nas_led = &nasgpio_leds[led_nr];
+	struct led_classdev *led = get_classdev_for_led_nr(led_nr);
+
+	led->name = nas_led->name;
+	led->brightness = LED_OFF;
+	if (nasgpio_led_get_attr(led, GP_LVL))
+		led->brightness = LED_FULL;
+	led->brightness_set = nasgpio_led_set_brightness;
+	led->blink_set = nasgpio_led_set_blink;
+	led->groups = nasgpio_led_groups;
+	ret = led_classdev_register(&nas_gpio_pci_dev->dev, led);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void unregister_nasgpio_led(int led_nr)
+{
+	struct led_classdev *led = get_classdev_for_led_nr(led_nr);
+	led_classdev_unregister(led);
+}
+/*
+ * module load/initialization
+ */
+static int __init nas_gpio_init(void)
+{
+	int i;
+	int ret = 0;
+	int nr_devices = 0;
+
+	nr_devices = dmi_check_system(nas_led_whitelist);
+	if (nodetect) {
+		pr_info("skipping hardware autodetection\n");
+		pr_info("Please send 'dmidecode' output to dave@sr71.net\n");
+		nr_devices++;
+	}
+
+	if (nr_devices <= 0) {
+		pr_info("no LED devices found\n");
+		return -ENODEV;
+	}
+
+	pr_info("registering PCI driver\n");
+	ret = pci_register_driver(&nas_gpio_pci_driver);
+	if (ret)
+		return ret;
+	for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++) {
+		ret = register_nasgpio_led(i);
+		if (ret)
+			goto out_err;
+	}
+	/*
+	 * When the system powers on, the BIOS leaves the power
+	 * light blue and blinking.  This will turn it solid
+	 * amber once the driver is loaded.
+	 */
+	set_power_light_amber_noblink();
+	return 0;
+out_err:
+	for (i--; i >= 0; i--)
+		unregister_nasgpio_led(i);
+	pci_unregister_driver(&nas_gpio_pci_driver);
+	return ret;
+}
+
+/*
+ * module unload
+ */
+static void __exit nas_gpio_exit(void)
+{
+	int i;
+	pr_info("Unregistering driver\n");
+	for (i = 0; i < ARRAY_SIZE(nasgpio_leds); i++)
+		unregister_nasgpio_led(i);
+	pci_unregister_driver(&nas_gpio_pci_driver);
+}
+
+module_init(nas_gpio_init);
+module_exit(nas_gpio_exit);

drivers/leds/leds-sunfire.c

@@ -0,0 +1,264 @@
+/* leds-sunfire.c: SUNW,Ultra-Enterprise LED driver.
+ *
+ * Copyright (C) 2008 David S. Miller <davem@davemloft.net>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <asm/fhc.h>
+#include <asm/upa.h>
+
+MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
+MODULE_DESCRIPTION("Sun Fire LED driver");
+MODULE_LICENSE("GPL");
+
+struct sunfire_led {
+	struct led_classdev	led_cdev;
+	void __iomem		*reg;
+};
+#define	to_sunfire_led(d) container_of(d, struct sunfire_led, led_cdev)
+
+static void __clockboard_set(struct led_classdev *led_cdev,
+			     enum led_brightness led_val, u8 bit)
+{
+	struct sunfire_led *p = to_sunfire_led(led_cdev);
+	u8 reg = upa_readb(p->reg);
+
+	switch (bit) {
+	case CLOCK_CTRL_LLED:
+		if (led_val)
+			reg &= ~bit;
+		else
+			reg |= bit;
+		break;
+
+	default:
+		if (led_val)
+			reg |= bit;
+		else
+			reg &= ~bit;
+		break;
+	}
+	upa_writeb(reg, p->reg);
+}
+
+static void clockboard_left_set(struct led_classdev *led_cdev,
+				enum led_brightness led_val)
+{
+	__clockboard_set(led_cdev, led_val, CLOCK_CTRL_LLED);
+}
+
+static void clockboard_middle_set(struct led_classdev *led_cdev,
+				  enum led_brightness led_val)
+{
+	__clockboard_set(led_cdev, led_val, CLOCK_CTRL_MLED);
+}
+
+static void clockboard_right_set(struct led_classdev *led_cdev,
+				 enum led_brightness led_val)
+{
+	__clockboard_set(led_cdev, led_val, CLOCK_CTRL_RLED);
+}
+
+static void __fhc_set(struct led_classdev *led_cdev,
+			     enum led_brightness led_val, u32 bit)
+{
+	struct sunfire_led *p = to_sunfire_led(led_cdev);
+	u32 reg = upa_readl(p->reg);
+
+	switch (bit) {
+	case FHC_CONTROL_LLED:
+		if (led_val)
+			reg &= ~bit;
+		else
+			reg |= bit;
+		break;
+
+	default:
+		if (led_val)
+			reg |= bit;
+		else
+			reg &= ~bit;
+		break;
+	}
+	upa_writel(reg, p->reg);
+}
+
+static void fhc_left_set(struct led_classdev *led_cdev,
+			 enum led_brightness led_val)
+{
+	__fhc_set(led_cdev, led_val, FHC_CONTROL_LLED);
+}
+
+static void fhc_middle_set(struct led_classdev *led_cdev,
+			   enum led_brightness led_val)
+{
+	__fhc_set(led_cdev, led_val, FHC_CONTROL_MLED);
+}
+
+static void fhc_right_set(struct led_classdev *led_cdev,
+			  enum led_brightness led_val)
+{
+	__fhc_set(led_cdev, led_val, FHC_CONTROL_RLED);
+}
+
+typedef void (*set_handler)(struct led_classdev *, enum led_brightness);
+struct led_type {
+	const char	*name;
+	set_handler	handler;
+	const char	*default_trigger;
+};
+
+#define NUM_LEDS_PER_BOARD	3
+struct sunfire_drvdata {
+	struct sunfire_led	leds[NUM_LEDS_PER_BOARD];
+};
+
+static int sunfire_led_generic_probe(struct platform_device *pdev,
+					       struct led_type *types)
+{
+	struct sunfire_drvdata *p;
+	int i, err;
+
+	if (pdev->num_resources != 1) {
+		dev_err(&pdev->dev, "Wrong number of resources %d, should be 1\n",
+		       pdev->num_resources);
+		return -EINVAL;
+	}
+
+	p = devm_kzalloc(&pdev->dev, sizeof(*p), GFP_KERNEL);
+	if (!p)
+		return -ENOMEM;
+
+	for (i = 0; i < NUM_LEDS_PER_BOARD; i++) {
+		struct led_classdev *lp = &p->leds[i].led_cdev;
+
+		p->leds[i].reg = (void __iomem *) pdev->resource[0].start;
+		lp->name = types[i].name;
+		lp->brightness = LED_FULL;
+		lp->brightness_set = types[i].handler;
+		lp->default_trigger = types[i].default_trigger;
+
+		err = led_classdev_register(&pdev->dev, lp);
+		if (err) {
+			dev_err(&pdev->dev, "Could not register %s LED\n",
+			       lp->name);
+			for (i--; i >= 0; i--)
+				led_classdev_unregister(&p->leds[i].led_cdev);
+			return err;
+		}
+	}
+
+	platform_set_drvdata(pdev, p);
+
+	return 0;
+}
+
+static int sunfire_led_generic_remove(struct platform_device *pdev)
+{
+	struct sunfire_drvdata *p = platform_get_drvdata(pdev);
+	int i;
+
+	for (i = 0; i < NUM_LEDS_PER_BOARD; i++)
+		led_classdev_unregister(&p->leds[i].led_cdev);
+
+	return 0;
+}
+
+static struct led_type clockboard_led_types[NUM_LEDS_PER_BOARD] = {
+	{
+		.name		= "clockboard-left",
+		.handler	= clockboard_left_set,
+	},
+	{
+		.name		= "clockboard-middle",
+		.handler	= clockboard_middle_set,
+	},
+	{
+		.name		= "clockboard-right",
+		.handler	= clockboard_right_set,
+		.default_trigger = "heartbeat",
+	},
+};
+
+static int sunfire_clockboard_led_probe(struct platform_device *pdev)
+{
+	return sunfire_led_generic_probe(pdev, clockboard_led_types);
+}
+
+static struct led_type fhc_led_types[NUM_LEDS_PER_BOARD] = {
+	{
+		.name		= "fhc-left",
+		.handler	= fhc_left_set,
+	},
+	{
+		.name		= "fhc-middle",
+		.handler	= fhc_middle_set,
+	},
+	{
+		.name		= "fhc-right",
+		.handler	= fhc_right_set,
+		.default_trigger = "heartbeat",
+	},
+};
+
+static int sunfire_fhc_led_probe(struct platform_device *pdev)
+{
+	return sunfire_led_generic_probe(pdev, fhc_led_types);
+}
+
+MODULE_ALIAS("platform:sunfire-clockboard-leds");
+MODULE_ALIAS("platform:sunfire-fhc-leds");
+
+static struct platform_driver sunfire_clockboard_led_driver = {
+	.probe		= sunfire_clockboard_led_probe,
+	.remove		= sunfire_led_generic_remove,
+	.driver		= {
+		.name	= "sunfire-clockboard-leds",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static struct platform_driver sunfire_fhc_led_driver = {
+	.probe		= sunfire_fhc_led_probe,
+	.remove		= sunfire_led_generic_remove,
+	.driver		= {
+		.name	= "sunfire-fhc-leds",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init sunfire_leds_init(void)
+{
+	int err = platform_driver_register(&sunfire_clockboard_led_driver);
+
+	if (err) {
+		pr_err("Could not register clock board LED driver\n");
+		return err;
+	}
+
+	err = platform_driver_register(&sunfire_fhc_led_driver);
+	if (err) {
+		pr_err("Could not register FHC LED driver\n");
+		platform_driver_unregister(&sunfire_clockboard_led_driver);
+	}
+
+	return err;
+}
+
+static void __exit sunfire_leds_exit(void)
+{
+	platform_driver_unregister(&sunfire_clockboard_led_driver);
+	platform_driver_unregister(&sunfire_fhc_led_driver);
+}
+
+module_init(sunfire_leds_init);
+module_exit(sunfire_leds_exit);

drivers/leds/leds-syscon.c

@@ -0,0 +1,166 @@
+/*
+ * Generic Syscon LEDs Driver
+ *
+ * Copyright (c) 2014, Linaro Limited
+ * Author: Linus Walleij <linus.walleij@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ * This driver provides system reboot functionality for APM X-Gene SoC.
+ * For system shutdown, this is board specify. If a board designer
+ * implements GPIO shutdown, use the gpio-poweroff.c driver.
+ */
+#include <linux/io.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/stat.h>
+#include <linux/slab.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/leds.h>
+
+/**
+ * struct syscon_led - state container for syscon based LEDs
+ * @cdev: LED class device for this LED
+ * @map: regmap to access the syscon device backing this LED
+ * @offset: the offset into the syscon regmap for the LED register
+ * @mask: the bit in the register corresponding to the LED
+ * @state: current state of the LED
+ */
+struct syscon_led {
+	struct led_classdev cdev;
+	struct regmap *map;
+	u32 offset;
+	u32 mask;
+	bool state;
+};
+
+static void syscon_led_set(struct led_classdev *led_cdev,
+	enum led_brightness value)
+{
+	struct syscon_led *sled =
+		container_of(led_cdev, struct syscon_led, cdev);
+	u32 val;
+	int ret;
+
+	if (value == LED_OFF) {
+		val = 0;
+		sled->state = false;
+	} else {
+		val = sled->mask;
+		sled->state = true;
+	}
+
+	ret = regmap_update_bits(sled->map, sled->offset, sled->mask, val);
+	if (ret < 0)
+		dev_err(sled->cdev.dev, "error updating LED status\n");
+}
+
+static const struct of_device_id syscon_match[] = {
+	{ .compatible = "syscon", },
+	{},
+};
+
+static int __init syscon_leds_init(void)
+{
+	const struct of_device_id *devid;
+	struct device_node *np;
+	struct device_node *child;
+	struct regmap *map;
+	struct platform_device *pdev;
+	struct device *dev;
+	int ret;
+
+	np = of_find_matching_node_and_match(NULL, syscon_match,
+					     &devid);
+	if (!np)
+		return -ENODEV;
+
+	map = syscon_node_to_regmap(np);
+	if (IS_ERR(map))
+		return PTR_ERR(map);
+
+	/*
+	 * If the map is there, the device should be there, we allocate
+	 * memory on the syscon device's behalf here.
+	 */
+	pdev = of_find_device_by_node(np);
+	if (!pdev)
+		return -ENODEV;
+	dev = &pdev->dev;
+
+	for_each_available_child_of_node(np, child) {
+		struct syscon_led *sled;
+		const char *state;
+
+		/* Only check for register-bit-leds */
+		if (of_property_match_string(child, "compatible",
+					     "register-bit-led") < 0)
+			continue;
+
+		sled = devm_kzalloc(dev, sizeof(*sled), GFP_KERNEL);
+		if (!sled)
+			return -ENOMEM;
+
+		sled->map = map;
+
+		if (of_property_read_u32(child, "offset", &sled->offset))
+			return -EINVAL;
+		if (of_property_read_u32(child, "mask", &sled->mask))
+			return -EINVAL;
+		sled->cdev.name =
+			of_get_property(child, "label", NULL) ? : child->name;
+		sled->cdev.default_trigger =
+			of_get_property(child, "linux,default-trigger", NULL);
+
+		state = of_get_property(child, "default-state", NULL);
+		if (state) {
+			if (!strcmp(state, "keep")) {
+				u32 val;
+
+				ret = regmap_read(map, sled->offset, &val);
+				if (ret < 0)
+					return ret;
+				sled->state = !!(val & sled->mask);
+			} else if (!strcmp(state, "on")) {
+				sled->state = true;
+				ret = regmap_update_bits(map, sled->offset,
+							 sled->mask,
+							 sled->mask);
+				if (ret < 0)
+					return ret;
+			} else {
+				sled->state = false;
+				ret = regmap_update_bits(map, sled->offset,
+							 sled->mask, 0);
+				if (ret < 0)
+					return ret;
+			}
+
+		}
+		sled->cdev.brightness_set = syscon_led_set;
+
+		ret = led_classdev_register(dev, &sled->cdev);
+		if (ret < 0)
+			return ret;
+
+		dev_info(dev, "registered LED %s\n", sled->cdev.name);
+	}
+
+       return 0;
+}
+device_initcall(syscon_leds_init);

drivers/leds/leds-tca6507.c

@@ -0,0 +1,845 @@
+/*
+ * leds-tca6507
+ *
+ * The TCA6507 is a programmable LED controller that can drive 7
+ * separate lines either by holding them low, or by pulsing them
+ * with modulated width.
+ * The modulation can be varied in a simple pattern to produce a
+ * blink or double-blink.
+ *
+ * This driver can configure each line either as a 'GPIO' which is
+ * out-only (pull-up resistor required) or as an LED with variable
+ * brightness and hardware-assisted blinking.
+ *
+ * Apart from OFF and ON there are three programmable brightness
+ * levels which can be programmed from 0 to 15 and indicate how many
+ * 500usec intervals in each 8msec that the led is 'on'.  The levels
+ * are named MASTER, BANK0 and BANK1.
+ *
+ * There are two different blink rates that can be programmed, each
+ * with separate time for rise, on, fall, off and second-off.  Thus if
+ * 3 or more different non-trivial rates are required, software must
+ * be used for the extra rates. The two different blink rates must
+ * align with the two levels BANK0 and BANK1.  This driver does not
+ * support double-blink so 'second-off' always matches 'off'.
+ *
+ * Only 16 different times can be programmed in a roughly logarithmic
+ * scale from 64ms to 16320ms.  To be precise the possible times are:
+ *    0, 64, 128, 192, 256, 384, 512, 768,
+ *    1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320
+ *
+ * Times that cannot be closely matched with these must be handled in
+ * software.  This driver allows 12.5% error in matching.
+ *
+ * This driver does not allow rise/fall rates to be set explicitly.
+ * When trying to match a given 'on' or 'off' period, an appropriate
+ * pair of 'change' and 'hold' times are chosen to get a close match.
+ * If the target delay is even, the 'change' number will be the
+ * smaller; if odd, the 'hold' number will be the smaller.
+
+ * Choosing pairs of delays with 12.5% errors allows us to match
+ * delays in the ranges: 56-72, 112-144, 168-216, 224-27504,
+ * 28560-36720.
+ * 26% of the achievable sums can be matched by multiple pairings.
+ * For example 1536 == 1536+0, 1024+512, or 768+768.
+ * This driver will always choose the pairing with the least
+ * maximum - 768+768 in this case.  Other pairings are not available.
+ *
+ * Access to the 3 levels and 2 blinks are on a first-come,
+ * first-served basis.  Access can be shared by multiple leds if they
+ * have the same level and either same blink rates, or some don't
+ * blink.  When a led changes, it relinquishes access and tries again,
+ * so it might lose access to hardware blink.
+ *
+ * If a blink engine cannot be allocated, software blink is used.  If
+ * the desired brightness cannot be allocated, the closest available
+ * non-zero brightness is used.  As 'full' is always available, the
+ * worst case would be to have two different blink rates at '1', with
+ * Max at '2', then other leds will have to choose between '2' and
+ * '16'.  Hopefully this is not likely.
+ *
+ * Each bank (BANK0 and BANK1) has two usage counts - LEDs using the
+ * brightness and LEDs using the blink.  It can only be reprogrammed
+ * when the appropriate counter is zero.  The MASTER level has a
+ * single usage count.
+ *
+ * Each LED has programmable 'on' and 'off' time as milliseconds.
+ * With each there is a flag saying if it was explicitly requested or
+ * defaulted.  Similarly the banks know if each time was explicit or a
+ * default.  Defaults are permitted to be changed freely - they are
+ * not recognised when matching.
+ *
+ *
+ * An led-tca6507 device must be provided with platform data or
+ * configured via devicetree.
+ *
+ * The platform-data lists for each output: the name, default trigger,
+ * and whether the signal is being used as a GPIO rather than an LED.
+ * 'struct led_plaform_data' is used for this.  If 'name' is NULL, the
+ * output isn't used.  If 'flags' is TCA6507_MAKE_GPIO, the output is
+ * a GPO.  The "struct led_platform_data" can be embedded in a "struct
+ * tca6507_platform_data" which adds a 'gpio_base' for the GPIOs, and
+ * a 'setup' callback which is called once the GPIOs are available.
+ *
+ * When configured via devicetree there is one child for each output.
+ * The "reg" determines the output number and "compatible" determines
+ * whether it is an LED or a GPIO.  "linux,default-trigger" can set a
+ * default trigger.
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/workqueue.h>
+#include <linux/leds-tca6507.h>
+#include <linux/of.h>
+
+/* LED select registers determine the source that drives LED outputs */
+#define TCA6507_LS_LED_OFF	0x0	/* Output HI-Z (off) */
+#define TCA6507_LS_LED_OFF1	0x1	/* Output HI-Z (off) - not used */
+#define TCA6507_LS_LED_PWM0	0x2	/* Output LOW with Bank0 rate */
+#define TCA6507_LS_LED_PWM1	0x3	/* Output LOW with Bank1 rate */
+#define TCA6507_LS_LED_ON	0x4	/* Output LOW (on) */
+#define TCA6507_LS_LED_MIR	0x5	/* Output LOW with Master Intensity */
+#define TCA6507_LS_BLINK0	0x6	/* Blink at Bank0 rate */
+#define TCA6507_LS_BLINK1	0x7	/* Blink at Bank1 rate */
+
+enum {
+	BANK0,
+	BANK1,
+	MASTER,
+};
+static int bank_source[3] = {
+	TCA6507_LS_LED_PWM0,
+	TCA6507_LS_LED_PWM1,
+	TCA6507_LS_LED_MIR,
+};
+static int blink_source[2] = {
+	TCA6507_LS_BLINK0,
+	TCA6507_LS_BLINK1,
+};
+
+/* PWM registers */
+#define	TCA6507_REG_CNT			11
+
+/*
+ * 0x00, 0x01, 0x02 encode the TCA6507_LS_* values, each output
+ * owns one bit in each register
+ */
+#define	TCA6507_FADE_ON			0x03
+#define	TCA6507_FULL_ON			0x04
+#define	TCA6507_FADE_OFF		0x05
+#define	TCA6507_FIRST_OFF		0x06
+#define	TCA6507_SECOND_OFF		0x07
+#define	TCA6507_MAX_INTENSITY		0x08
+#define	TCA6507_MASTER_INTENSITY	0x09
+#define	TCA6507_INITIALIZE		0x0A
+
+#define	INIT_CODE			0x8
+
+#define TIMECODES 16
+static int time_codes[TIMECODES] = {
+	0, 64, 128, 192, 256, 384, 512, 768,
+	1024, 1536, 2048, 3072, 4096, 5760, 8128, 16320
+};
+
+/* Convert an led.brightness level (0..255) to a TCA6507 level (0..15) */
+static inline int TO_LEVEL(int brightness)
+{
+	return brightness >> 4;
+}
+
+/* ...and convert back */
+static inline int TO_BRIGHT(int level)
+{
+	if (level)
+		return (level << 4) | 0xf;
+	return 0;
+}
+
+#define NUM_LEDS 7
+struct tca6507_chip {
+	int			reg_set;	/* One bit per register where
+						 * a '1' means the register
+						 * should be written */
+	u8			reg_file[TCA6507_REG_CNT];
+	/* Bank 2 is Master Intensity and doesn't use times */
+	struct bank {
+		int level;
+		int ontime, offtime;
+		int on_dflt, off_dflt;
+		int time_use, level_use;
+	} bank[3];
+	struct i2c_client	*client;
+	struct work_struct	work;
+	spinlock_t		lock;
+
+	struct tca6507_led {
+		struct tca6507_chip	*chip;
+		struct led_classdev	led_cdev;
+		int			num;
+		int			ontime, offtime;
+		int			on_dflt, off_dflt;
+		int			bank;	/* Bank used, or -1 */
+		int			blink;	/* Set if hardware-blinking */
+	} leds[NUM_LEDS];
+#ifdef CONFIG_GPIOLIB
+	struct gpio_chip		gpio;
+	const char			*gpio_name[NUM_LEDS];
+	int				gpio_map[NUM_LEDS];
+#endif
+};
+
+static const struct i2c_device_id tca6507_id[] = {
+	{ "tca6507" },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, tca6507_id);
+
+static int choose_times(int msec, int *c1p, int *c2p)
+{
+	/*
+	 * Choose two timecodes which add to 'msec' as near as
+	 * possible.  The first returned is the 'on' or 'off' time.
+	 * The second is to be used as a 'fade-on' or 'fade-off' time.
+	 * If 'msec' is even, the first will not be smaller than the
+	 * second.  If 'msec' is odd, the first will not be larger
+	 * than the second.
+	 * If we cannot get a sum within 1/8 of 'msec' fail with
+	 * -EINVAL, otherwise return the sum that was achieved, plus 1
+	 * if the first is smaller.
+	 * If two possibilities are equally good (e.g. 512+0,
+	 * 256+256), choose the first pair so there is more
+	 * change-time visible (i.e. it is softer).
+	 */
+	int c1, c2;
+	int tmax = msec * 9 / 8;
+	int tmin = msec * 7 / 8;
+	int diff = 65536;
+
+	/* We start at '1' to ensure we never even think of choosing a
+	 * total time of '0'.
+	 */
+	for (c1 = 1; c1 < TIMECODES; c1++) {
+		int t = time_codes[c1];
+		if (t*2 < tmin)
+			continue;
+		if (t > tmax)
+			break;
+		for (c2 = 0; c2 <= c1; c2++) {
+			int tt = t + time_codes[c2];
+			int d;
+			if (tt < tmin)
+				continue;
+			if (tt > tmax)
+				break;
+			/* This works! */
+			d = abs(msec - tt);
+			if (d >= diff)
+				continue;
+			/* Best yet */
+			*c1p = c1;
+			*c2p = c2;
+			diff = d;
+			if (d == 0)
+				return msec;
+		}
+	}
+	if (diff < 65536) {
+		int actual;
+		if (msec & 1) {
+			c1 = *c2p;
+			*c2p = *c1p;
+			*c1p = c1;
+		}
+		actual = time_codes[*c1p] + time_codes[*c2p];
+		if (*c1p < *c2p)
+			return actual + 1;
+		else
+			return actual;
+	}
+	/* No close match */
+	return -EINVAL;
+}
+
+/*
+ * Update the register file with the appropriate 3-bit state for the
+ * given led.
+ */
+static void set_select(struct tca6507_chip *tca, int led, int val)
+{
+	int mask = (1 << led);
+	int bit;
+
+	for (bit = 0; bit < 3; bit++) {
+		int n = tca->reg_file[bit] & ~mask;
+		if (val & (1 << bit))
+			n |= mask;
+		if (tca->reg_file[bit] != n) {
+			tca->reg_file[bit] = n;
+			tca->reg_set |= (1 << bit);
+		}
+	}
+}
+
+/* Update the register file with the appropriate 4-bit code for one
+ * bank or other.  This can be used for timers, for levels, or for
+ * initialization.
+ */
+static void set_code(struct tca6507_chip *tca, int reg, int bank, int new)
+{
+	int mask = 0xF;
+	int n;
+	if (bank) {
+		mask <<= 4;
+		new <<= 4;
+	}
+	n = tca->reg_file[reg] & ~mask;
+	n |= new;
+	if (tca->reg_file[reg] != n) {
+		tca->reg_file[reg] = n;
+		tca->reg_set |= 1 << reg;
+	}
+}
+
+/* Update brightness level. */
+static void set_level(struct tca6507_chip *tca, int bank, int level)
+{
+	switch (bank) {
+	case BANK0:
+	case BANK1:
+		set_code(tca, TCA6507_MAX_INTENSITY, bank, level);
+		break;
+	case MASTER:
+		set_code(tca, TCA6507_MASTER_INTENSITY, 0, level);
+		break;
+	}
+	tca->bank[bank].level = level;
+}
+
+/* Record all relevant time codes for a given bank */
+static void set_times(struct tca6507_chip *tca, int bank)
+{
+	int c1, c2;
+	int result;
+
+	result = choose_times(tca->bank[bank].ontime, &c1, &c2);
+	dev_dbg(&tca->client->dev,
+		"Chose on  times %d(%d) %d(%d) for %dms\n",
+		c1, time_codes[c1],
+		c2, time_codes[c2], tca->bank[bank].ontime);
+	set_code(tca, TCA6507_FADE_ON, bank, c2);
+	set_code(tca, TCA6507_FULL_ON, bank, c1);
+	tca->bank[bank].ontime = result;
+
+	result = choose_times(tca->bank[bank].offtime, &c1, &c2);
+	dev_dbg(&tca->client->dev,
+		"Chose off times %d(%d) %d(%d) for %dms\n",
+		c1, time_codes[c1],
+		c2, time_codes[c2], tca->bank[bank].offtime);
+	set_code(tca, TCA6507_FADE_OFF, bank, c2);
+	set_code(tca, TCA6507_FIRST_OFF, bank, c1);
+	set_code(tca, TCA6507_SECOND_OFF, bank, c1);
+	tca->bank[bank].offtime = result;
+
+	set_code(tca, TCA6507_INITIALIZE, bank, INIT_CODE);
+}
+
+/* Write all needed register of tca6507 */
+
+static void tca6507_work(struct work_struct *work)
+{
+	struct tca6507_chip *tca = container_of(work, struct tca6507_chip,
+						work);
+	struct i2c_client *cl = tca->client;
+	int set;
+	u8 file[TCA6507_REG_CNT];
+	int r;
+
+	spin_lock_irq(&tca->lock);
+	set = tca->reg_set;
+	memcpy(file, tca->reg_file, TCA6507_REG_CNT);
+	tca->reg_set = 0;
+	spin_unlock_irq(&tca->lock);
+
+	for (r = 0; r < TCA6507_REG_CNT; r++)
+		if (set & (1<<r))
+			i2c_smbus_write_byte_data(cl, r, file[r]);
+}
+
+static void led_release(struct tca6507_led *led)
+{
+	/* If led owns any resource, release it. */
+	struct tca6507_chip *tca = led->chip;
+	if (led->bank >= 0) {
+		struct bank *b = tca->bank + led->bank;
+		if (led->blink)
+			b->time_use--;
+		b->level_use--;
+	}
+	led->blink = 0;
+	led->bank = -1;
+}
+
+static int led_prepare(struct tca6507_led *led)
+{
+	/* Assign this led to a bank, configuring that bank if
+	 * necessary. */
+	int level = TO_LEVEL(led->led_cdev.brightness);
+	struct tca6507_chip *tca = led->chip;
+	int c1, c2;
+	int i;
+	struct bank *b;
+	int need_init = 0;
+
+	led->led_cdev.brightness = TO_BRIGHT(level);
+	if (level == 0) {
+		set_select(tca, led->num, TCA6507_LS_LED_OFF);
+		return 0;
+	}
+
+	if (led->ontime == 0 || led->offtime == 0) {
+		/*
+		 * Just set the brightness, choosing first usable
+		 * bank.  If none perfect, choose best.  Count
+		 * backwards so we check MASTER bank first to avoid
+		 * wasting a timer.
+		 */
+		int best = -1;/* full-on */
+		int diff = 15-level;
+
+		if (level == 15) {
+			set_select(tca, led->num, TCA6507_LS_LED_ON);
+			return 0;
+		}
+
+		for (i = MASTER; i >= BANK0; i--) {
+			int d;
+			if (tca->bank[i].level == level ||
+			    tca->bank[i].level_use == 0) {
+				best = i;
+				break;
+			}
+			d = abs(level - tca->bank[i].level);
+			if (d < diff) {
+				diff = d;
+				best = i;
+			}
+		}
+		if (best == -1) {
+			/* Best brightness is full-on */
+			set_select(tca, led->num, TCA6507_LS_LED_ON);
+			led->led_cdev.brightness = LED_FULL;
+			return 0;
+		}
+
+		if (!tca->bank[best].level_use)
+			set_level(tca, best, level);
+
+		tca->bank[best].level_use++;
+		led->bank = best;
+		set_select(tca, led->num, bank_source[best]);
+		led->led_cdev.brightness = TO_BRIGHT(tca->bank[best].level);
+		return 0;
+	}
+
+	/*
+	 * We have on/off time so we need to try to allocate a timing
+	 * bank.  First check if times are compatible with hardware
+	 * and give up if not.
+	 */
+	if (choose_times(led->ontime, &c1, &c2) < 0)
+		return -EINVAL;
+	if (choose_times(led->offtime, &c1, &c2) < 0)
+		return -EINVAL;
+
+	for (i = BANK0; i <= BANK1; i++) {
+		if (tca->bank[i].level_use == 0)
+			/* not in use - it is ours! */
+			break;
+		if (tca->bank[i].level != level)
+			/* Incompatible level - skip */
+			/* FIX: if timer matches we maybe should consider
+			 * this anyway...
+			 */
+			continue;
+
+		if (tca->bank[i].time_use == 0)
+			/* Timer not in use, and level matches - use it */
+			break;
+
+		if (!(tca->bank[i].on_dflt ||
+		      led->on_dflt ||
+		      tca->bank[i].ontime == led->ontime))
+			/* on time is incompatible */
+			continue;
+
+		if (!(tca->bank[i].off_dflt ||
+		      led->off_dflt ||
+		      tca->bank[i].offtime == led->offtime))
+			/* off time is incompatible */
+			continue;
+
+		/* looks like a suitable match */
+		break;
+	}
+
+	if (i > BANK1)
+		/* Nothing matches - how sad */
+		return -EINVAL;
+
+	b = &tca->bank[i];
+	if (b->level_use == 0)
+		set_level(tca, i, level);
+	b->level_use++;
+	led->bank = i;
+
+	if (b->on_dflt ||
+	    !led->on_dflt ||
+	    b->time_use == 0) {
+		b->ontime = led->ontime;
+		b->on_dflt = led->on_dflt;
+		need_init = 1;
+	}
+
+	if (b->off_dflt ||
+	    !led->off_dflt ||
+	    b->time_use == 0) {
+		b->offtime = led->offtime;
+		b->off_dflt = led->off_dflt;
+		need_init = 1;
+	}
+
+	if (need_init)
+		set_times(tca, i);
+
+	led->ontime = b->ontime;
+	led->offtime = b->offtime;
+
+	b->time_use++;
+	led->blink = 1;
+	led->led_cdev.brightness = TO_BRIGHT(b->level);
+	set_select(tca, led->num, blink_source[i]);
+	return 0;
+}
+
+static int led_assign(struct tca6507_led *led)
+{
+	struct tca6507_chip *tca = led->chip;
+	int err;
+	unsigned long flags;
+
+	spin_lock_irqsave(&tca->lock, flags);
+	led_release(led);
+	err = led_prepare(led);
+	if (err) {
+		/*
+		 * Can only fail on timer setup.  In that case we need
+		 * to re-establish as steady level.
+		 */
+		led->ontime = 0;
+		led->offtime = 0;
+		led_prepare(led);
+	}
+	spin_unlock_irqrestore(&tca->lock, flags);
+
+	if (tca->reg_set)
+		schedule_work(&tca->work);
+	return err;
+}
+
+static void tca6507_brightness_set(struct led_classdev *led_cdev,
+				   enum led_brightness brightness)
+{
+	struct tca6507_led *led = container_of(led_cdev, struct tca6507_led,
+					       led_cdev);
+	led->led_cdev.brightness = brightness;
+	led->ontime = 0;
+	led->offtime = 0;
+	led_assign(led);
+}
+
+static int tca6507_blink_set(struct led_classdev *led_cdev,
+			     unsigned long *delay_on,
+			     unsigned long *delay_off)
+{
+	struct tca6507_led *led = container_of(led_cdev, struct tca6507_led,
+					       led_cdev);
+
+	if (*delay_on == 0)
+		led->on_dflt = 1;
+	else if (delay_on != &led_cdev->blink_delay_on)
+		led->on_dflt = 0;
+	led->ontime = *delay_on;
+
+	if (*delay_off == 0)
+		led->off_dflt = 1;
+	else if (delay_off != &led_cdev->blink_delay_off)
+		led->off_dflt = 0;
+	led->offtime = *delay_off;
+
+	if (led->ontime == 0)
+		led->ontime = 512;
+	if (led->offtime == 0)
+		led->offtime = 512;
+
+	if (led->led_cdev.brightness == LED_OFF)
+		led->led_cdev.brightness = LED_FULL;
+	if (led_assign(led) < 0) {
+		led->ontime = 0;
+		led->offtime = 0;
+		led->led_cdev.brightness = LED_OFF;
+		return -EINVAL;
+	}
+	*delay_on = led->ontime;
+	*delay_off = led->offtime;
+	return 0;
+}
+
+#ifdef CONFIG_GPIOLIB
+static void tca6507_gpio_set_value(struct gpio_chip *gc,
+				   unsigned offset, int val)
+{
+	struct tca6507_chip *tca = container_of(gc, struct tca6507_chip, gpio);
+	unsigned long flags;
+
+	spin_lock_irqsave(&tca->lock, flags);
+	/*
+	 * 'OFF' is floating high, and 'ON' is pulled down, so it has
+	 * the inverse sense of 'val'.
+	 */
+	set_select(tca, tca->gpio_map[offset],
+		   val ? TCA6507_LS_LED_OFF : TCA6507_LS_LED_ON);
+	spin_unlock_irqrestore(&tca->lock, flags);
+	if (tca->reg_set)
+		schedule_work(&tca->work);
+}
+
+static int tca6507_gpio_direction_output(struct gpio_chip *gc,
+					  unsigned offset, int val)
+{
+	tca6507_gpio_set_value(gc, offset, val);
+	return 0;
+}
+
+static int tca6507_probe_gpios(struct i2c_client *client,
+			       struct tca6507_chip *tca,
+			       struct tca6507_platform_data *pdata)
+{
+	int err;
+	int i = 0;
+	int gpios = 0;
+
+	for (i = 0; i < NUM_LEDS; i++)
+		if (pdata->leds.leds[i].name && pdata->leds.leds[i].flags) {
+			/* Configure as a gpio */
+			tca->gpio_name[gpios] = pdata->leds.leds[i].name;
+			tca->gpio_map[gpios] = i;
+			gpios++;
+		}
+
+	if (!gpios)
+		return 0;
+
+	tca->gpio.label = "gpio-tca6507";
+	tca->gpio.names = tca->gpio_name;
+	tca->gpio.ngpio = gpios;
+	tca->gpio.base = pdata->gpio_base;
+	tca->gpio.owner = THIS_MODULE;
+	tca->gpio.direction_output = tca6507_gpio_direction_output;
+	tca->gpio.set = tca6507_gpio_set_value;
+	tca->gpio.dev = &client->dev;
+#ifdef CONFIG_OF_GPIO
+	tca->gpio.of_node = of_node_get(client->dev.of_node);
+#endif
+	err = gpiochip_add(&tca->gpio);
+	if (err) {
+		tca->gpio.ngpio = 0;
+		return err;
+	}
+	if (pdata->setup)
+		pdata->setup(tca->gpio.base, tca->gpio.ngpio);
+	return 0;
+}
+
+static void tca6507_remove_gpio(struct tca6507_chip *tca)
+{
+	if (tca->gpio.ngpio)
+		gpiochip_remove(&tca->gpio);
+}
+#else /* CONFIG_GPIOLIB */
+static int tca6507_probe_gpios(struct i2c_client *client,
+			       struct tca6507_chip *tca,
+			       struct tca6507_platform_data *pdata)
+{
+	return 0;
+}
+static void tca6507_remove_gpio(struct tca6507_chip *tca)
+{
+}
+#endif /* CONFIG_GPIOLIB */
+
+#ifdef CONFIG_OF
+static struct tca6507_platform_data *
+tca6507_led_dt_init(struct i2c_client *client)
+{
+	struct device_node *np = client->dev.of_node, *child;
+	struct tca6507_platform_data *pdata;
+	struct led_info *tca_leds;
+	int count;
+
+	count = of_get_child_count(np);
+	if (!count || count > NUM_LEDS)
+		return ERR_PTR(-ENODEV);
+
+	tca_leds = devm_kzalloc(&client->dev,
+			sizeof(struct led_info) * NUM_LEDS, GFP_KERNEL);
+	if (!tca_leds)
+		return ERR_PTR(-ENOMEM);
+
+	for_each_child_of_node(np, child) {
+		struct led_info led;
+		u32 reg;
+		int ret;
+
+		led.name =
+			of_get_property(child, "label", NULL) ? : child->name;
+		led.default_trigger =
+			of_get_property(child, "linux,default-trigger", NULL);
+		led.flags = 0;
+		if (of_property_match_string(child, "compatible", "gpio") >= 0)
+			led.flags |= TCA6507_MAKE_GPIO;
+		ret = of_property_read_u32(child, "reg", &reg);
+		if (ret != 0 || reg < 0 || reg >= NUM_LEDS)
+			continue;
+
+		tca_leds[reg] = led;
+	}
+	pdata = devm_kzalloc(&client->dev,
+			sizeof(struct tca6507_platform_data), GFP_KERNEL);
+	if (!pdata)
+		return ERR_PTR(-ENOMEM);
+
+	pdata->leds.leds = tca_leds;
+	pdata->leds.num_leds = NUM_LEDS;
+#ifdef CONFIG_GPIOLIB
+	pdata->gpio_base = -1;
+#endif
+	return pdata;
+}
+
+static const struct of_device_id of_tca6507_leds_match[] = {
+	{ .compatible = "ti,tca6507", },
+	{},
+};
+
+#else
+static struct tca6507_platform_data *
+tca6507_led_dt_init(struct i2c_client *client)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+#endif
+
+static int tca6507_probe(struct i2c_client *client,
+		const struct i2c_device_id *id)
+{
+	struct tca6507_chip *tca;
+	struct i2c_adapter *adapter;
+	struct tca6507_platform_data *pdata;
+	int err;
+	int i = 0;
+
+	adapter = to_i2c_adapter(client->dev.parent);
+	pdata = dev_get_platdata(&client->dev);
+
+	if (!i2c_check_functionality(adapter, I2C_FUNC_I2C))
+		return -EIO;
+
+	if (!pdata || pdata->leds.num_leds != NUM_LEDS) {
+		pdata = tca6507_led_dt_init(client);
+		if (IS_ERR(pdata)) {
+			dev_err(&client->dev, "Need %d entries in platform-data list\n",
+				NUM_LEDS);
+			return PTR_ERR(pdata);
+		}
+	}
+	tca = devm_kzalloc(&client->dev, sizeof(*tca), GFP_KERNEL);
+	if (!tca)
+		return -ENOMEM;
+
+	tca->client = client;
+	INIT_WORK(&tca->work, tca6507_work);
+	spin_lock_init(&tca->lock);
+	i2c_set_clientdata(client, tca);
+
+	for (i = 0; i < NUM_LEDS; i++) {
+		struct tca6507_led *l = tca->leds + i;
+
+		l->chip = tca;
+		l->num = i;
+		if (pdata->leds.leds[i].name && !pdata->leds.leds[i].flags) {
+			l->led_cdev.name = pdata->leds.leds[i].name;
+			l->led_cdev.default_trigger
+				= pdata->leds.leds[i].default_trigger;
+			l->led_cdev.brightness_set = tca6507_brightness_set;
+			l->led_cdev.blink_set = tca6507_blink_set;
+			l->bank = -1;
+			err = led_classdev_register(&client->dev,
+						    &l->led_cdev);
+			if (err < 0)
+				goto exit;
+		}
+	}
+	err = tca6507_probe_gpios(client, tca, pdata);
+	if (err)
+		goto exit;
+	/* set all registers to known state - zero */
+	tca->reg_set = 0x7f;
+	schedule_work(&tca->work);
+
+	return 0;
+exit:
+	while (i--) {
+		if (tca->leds[i].led_cdev.name)
+			led_classdev_unregister(&tca->leds[i].led_cdev);
+	}
+	return err;
+}
+
+static int tca6507_remove(struct i2c_client *client)
+{
+	int i;
+	struct tca6507_chip *tca = i2c_get_clientdata(client);
+	struct tca6507_led *tca_leds = tca->leds;
+
+	for (i = 0; i < NUM_LEDS; i++) {
+		if (tca_leds[i].led_cdev.name)
+			led_classdev_unregister(&tca_leds[i].led_cdev);
+	}
+	tca6507_remove_gpio(tca);
+	cancel_work_sync(&tca->work);
+
+	return 0;
+}
+
+static struct i2c_driver tca6507_driver = {
+	.driver   = {
+		.name    = "leds-tca6507",
+		.owner   = THIS_MODULE,
+		.of_match_table = of_match_ptr(of_tca6507_leds_match),
+	},
+	.probe    = tca6507_probe,
+	.remove   = tca6507_remove,
+	.id_table = tca6507_id,
+};
+
+module_i2c_driver(tca6507_driver);
+
+MODULE_AUTHOR("NeilBrown <neilb@suse.de>");
+MODULE_DESCRIPTION("TCA6507 LED/GPO driver");
+MODULE_LICENSE("GPL v2");

drivers/leds/leds-versatile.c

@@ -0,0 +1,110 @@
+/*
+ * Driver for the 8 user LEDs found on the RealViews and Versatiles
+ * Based on DaVinci's DM365 board code
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ * Author: Linus Walleij <triad@df.lth.se>
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/platform_device.h>
+
+struct versatile_led {
+	void __iomem		*base;
+	struct led_classdev	cdev;
+	u8			mask;
+};
+
+/*
+ * The triggers lines up below will only be used if the
+ * LED triggers are compiled in.
+ */
+static const struct {
+	const char *name;
+	const char *trigger;
+} versatile_leds[] = {
+	{ "versatile:0", "heartbeat", },
+	{ "versatile:1", "mmc0", },
+	{ "versatile:2", "cpu0" },
+	{ "versatile:3", "cpu1" },
+	{ "versatile:4", "cpu2" },
+	{ "versatile:5", "cpu3" },
+	{ "versatile:6", },
+	{ "versatile:7", },
+};
+
+static void versatile_led_set(struct led_classdev *cdev,
+			      enum led_brightness b)
+{
+	struct versatile_led *led = container_of(cdev,
+						 struct versatile_led, cdev);
+	u32 reg = readl(led->base);
+
+	if (b != LED_OFF)
+		reg |= led->mask;
+	else
+		reg &= ~led->mask;
+	writel(reg, led->base);
+}
+
+static enum led_brightness versatile_led_get(struct led_classdev *cdev)
+{
+	struct versatile_led *led = container_of(cdev,
+						 struct versatile_led, cdev);
+	u32 reg = readl(led->base);
+
+	return (reg & led->mask) ? LED_FULL : LED_OFF;
+}
+
+static int versatile_leds_probe(struct platform_device *dev)
+{
+	int i;
+	struct resource *res;
+	void __iomem *base;
+
+	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	base = devm_ioremap_resource(&dev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	/* All off */
+	writel(0, base);
+	for (i = 0; i < ARRAY_SIZE(versatile_leds); i++) {
+		struct versatile_led *led;
+
+		led = kzalloc(sizeof(*led), GFP_KERNEL);
+		if (!led)
+			break;
+
+		led->base = base;
+		led->cdev.name = versatile_leds[i].name;
+		led->cdev.brightness_set = versatile_led_set;
+		led->cdev.brightness_get = versatile_led_get;
+		led->cdev.default_trigger = versatile_leds[i].trigger;
+		led->mask = BIT(i);
+
+		if (led_classdev_register(NULL, &led->cdev) < 0) {
+			kfree(led);
+			break;
+		}
+	}
+
+	return 0;
+}
+
+static struct platform_driver versatile_leds_driver = {
+	.driver = {
+		.name   = "versatile-leds",
+	},
+	.probe = versatile_leds_probe,
+};
+
+module_platform_driver(versatile_leds_driver);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
+MODULE_DESCRIPTION("ARM Versatile LED driver");
+MODULE_LICENSE("GPL v2");

drivers/leds/leds-wm831x-status.c

@@ -0,0 +1,326 @@
+/*
+ * LED driver for WM831x status LEDs
+ *
+ * Copyright(C) 2009 Wolfson Microelectronics PLC.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/mfd/wm831x/core.h>
+#include <linux/mfd/wm831x/pdata.h>
+#include <linux/mfd/wm831x/status.h>
+#include <linux/module.h>
+
+
+struct wm831x_status {
+	struct led_classdev cdev;
+	struct wm831x *wm831x;
+	struct work_struct work;
+	struct mutex mutex;
+
+	spinlock_t value_lock;
+	int reg;     /* Control register */
+	int reg_val; /* Control register value */
+
+	int blink;
+	int blink_time;
+	int blink_cyc;
+	int src;
+	enum led_brightness brightness;
+};
+
+#define to_wm831x_status(led_cdev) \
+	container_of(led_cdev, struct wm831x_status, cdev)
+
+static void wm831x_status_work(struct work_struct *work)
+{
+	struct wm831x_status *led = container_of(work, struct wm831x_status,
+						 work);
+	unsigned long flags;
+
+	mutex_lock(&led->mutex);
+
+	led->reg_val &= ~(WM831X_LED_SRC_MASK | WM831X_LED_MODE_MASK |
+			  WM831X_LED_DUTY_CYC_MASK | WM831X_LED_DUR_MASK);
+
+	spin_lock_irqsave(&led->value_lock, flags);
+
+	led->reg_val |= led->src << WM831X_LED_SRC_SHIFT;
+	if (led->blink) {
+		led->reg_val |= 2 << WM831X_LED_MODE_SHIFT;
+		led->reg_val |= led->blink_time << WM831X_LED_DUR_SHIFT;
+		led->reg_val |= led->blink_cyc;
+	} else {
+		if (led->brightness != LED_OFF)
+			led->reg_val |= 1 << WM831X_LED_MODE_SHIFT;
+	}
+
+	spin_unlock_irqrestore(&led->value_lock, flags);
+
+	wm831x_reg_write(led->wm831x, led->reg, led->reg_val);
+
+	mutex_unlock(&led->mutex);
+}
+
+static void wm831x_status_set(struct led_classdev *led_cdev,
+			   enum led_brightness value)
+{
+	struct wm831x_status *led = to_wm831x_status(led_cdev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&led->value_lock, flags);
+	led->brightness = value;
+	if (value == LED_OFF)
+		led->blink = 0;
+	schedule_work(&led->work);
+	spin_unlock_irqrestore(&led->value_lock, flags);
+}
+
+static int wm831x_status_blink_set(struct led_classdev *led_cdev,
+				   unsigned long *delay_on,
+				   unsigned long *delay_off)
+{
+	struct wm831x_status *led = to_wm831x_status(led_cdev);
+	unsigned long flags;
+	int ret = 0;
+
+	/* Pick some defaults if we've not been given times */
+	if (*delay_on == 0 && *delay_off == 0) {
+		*delay_on = 250;
+		*delay_off = 250;
+	}
+
+	spin_lock_irqsave(&led->value_lock, flags);
+
+	/* We only have a limited selection of settings, see if we can
+	 * support the configuration we're being given */
+	switch (*delay_on) {
+	case 1000:
+		led->blink_time = 0;
+		break;
+	case 250:
+		led->blink_time = 1;
+		break;
+	case 125:
+		led->blink_time = 2;
+		break;
+	case 62:
+	case 63:
+		/* Actually 62.5ms */
+		led->blink_time = 3;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	if (ret == 0) {
+		switch (*delay_off / *delay_on) {
+		case 1:
+			led->blink_cyc = 0;
+			break;
+		case 3:
+			led->blink_cyc = 1;
+			break;
+		case 4:
+			led->blink_cyc = 2;
+			break;
+		case 8:
+			led->blink_cyc = 3;
+			break;
+		default:
+			ret = -EINVAL;
+			break;
+		}
+	}
+
+	if (ret == 0)
+		led->blink = 1;
+	else
+		led->blink = 0;
+
+	/* Always update; if we fail turn off blinking since we expect
+	 * a software fallback. */
+	schedule_work(&led->work);
+
+	spin_unlock_irqrestore(&led->value_lock, flags);
+
+	return ret;
+}
+
+static const char * const led_src_texts[] = {
+	"otp",
+	"power",
+	"charger",
+	"soft",
+};
+
+static ssize_t wm831x_status_src_show(struct device *dev,
+				      struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct wm831x_status *led = to_wm831x_status(led_cdev);
+	int i;
+	ssize_t ret = 0;
+
+	mutex_lock(&led->mutex);
+
+	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++)
+		if (i == led->src)
+			ret += sprintf(&buf[ret], "[%s] ", led_src_texts[i]);
+		else
+			ret += sprintf(&buf[ret], "%s ", led_src_texts[i]);
+
+	mutex_unlock(&led->mutex);
+
+	ret += sprintf(&buf[ret], "\n");
+
+	return ret;
+}
+
+static ssize_t wm831x_status_src_store(struct device *dev,
+				       struct device_attribute *attr,
+				       const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct wm831x_status *led = to_wm831x_status(led_cdev);
+	char name[20];
+	int i;
+	size_t len;
+
+	name[sizeof(name) - 1] = '\0';
+	strncpy(name, buf, sizeof(name) - 1);
+	len = strlen(name);
+
+	if (len && name[len - 1] == '\n')
+		name[len - 1] = '\0';
+
+	for (i = 0; i < ARRAY_SIZE(led_src_texts); i++) {
+		if (!strcmp(name, led_src_texts[i])) {
+			mutex_lock(&led->mutex);
+
+			led->src = i;
+			schedule_work(&led->work);
+
+			mutex_unlock(&led->mutex);
+		}
+	}
+
+	return size;
+}
+
+static DEVICE_ATTR(src, 0644, wm831x_status_src_show, wm831x_status_src_store);
+
+static struct attribute *wm831x_status_attrs[] = {
+	&dev_attr_src.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(wm831x_status);
+
+static int wm831x_status_probe(struct platform_device *pdev)
+{
+	struct wm831x *wm831x = dev_get_drvdata(pdev->dev.parent);
+	struct wm831x_pdata *chip_pdata;
+	struct wm831x_status_pdata pdata;
+	struct wm831x_status *drvdata;
+	struct resource *res;
+	int id = pdev->id % ARRAY_SIZE(chip_pdata->status);
+	int ret;
+
+	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "No register resource\n");
+		return -EINVAL;
+	}
+
+	drvdata = devm_kzalloc(&pdev->dev, sizeof(struct wm831x_status),
+			       GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, drvdata);
+
+	drvdata->wm831x = wm831x;
+	drvdata->reg = res->start;
+
+	if (dev_get_platdata(wm831x->dev))
+		chip_pdata = dev_get_platdata(wm831x->dev);
+	else
+		chip_pdata = NULL;
+
+	memset(&pdata, 0, sizeof(pdata));
+	if (chip_pdata && chip_pdata->status[id])
+		memcpy(&pdata, chip_pdata->status[id], sizeof(pdata));
+	else
+		pdata.name = dev_name(&pdev->dev);
+
+	mutex_init(&drvdata->mutex);
+	INIT_WORK(&drvdata->work, wm831x_status_work);
+	spin_lock_init(&drvdata->value_lock);
+
+	/* We cache the configuration register and read startup values
+	 * from it. */
+	drvdata->reg_val = wm831x_reg_read(wm831x, drvdata->reg);
+
+	if (drvdata->reg_val & WM831X_LED_MODE_MASK)
+		drvdata->brightness = LED_FULL;
+	else
+		drvdata->brightness = LED_OFF;
+
+	/* Set a default source if configured, otherwise leave the
+	 * current hardware setting.
+	 */
+	if (pdata.default_src == WM831X_STATUS_PRESERVE) {
+		drvdata->src = drvdata->reg_val;
+		drvdata->src &= WM831X_LED_SRC_MASK;
+		drvdata->src >>= WM831X_LED_SRC_SHIFT;
+	} else {
+		drvdata->src = pdata.default_src - 1;
+	}
+
+	drvdata->cdev.name = pdata.name;
+	drvdata->cdev.default_trigger = pdata.default_trigger;
+	drvdata->cdev.brightness_set = wm831x_status_set;
+	drvdata->cdev.blink_set = wm831x_status_blink_set;
+	drvdata->cdev.groups = wm831x_status_groups;
+
+	ret = led_classdev_register(wm831x->dev, &drvdata->cdev);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int wm831x_status_remove(struct platform_device *pdev)
+{
+	struct wm831x_status *drvdata = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&drvdata->cdev);
+
+	return 0;
+}
+
+static struct platform_driver wm831x_status_driver = {
+	.driver = {
+		   .name = "wm831x-status",
+		   .owner = THIS_MODULE,
+		   },
+	.probe = wm831x_status_probe,
+	.remove = wm831x_status_remove,
+};
+
+module_platform_driver(wm831x_status_driver);
+
+MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
+MODULE_DESCRIPTION("WM831x status LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm831x-status");

drivers/leds/leds-wm8350.c

@@ -0,0 +1,287 @@
+/*
+ * LED driver for WM8350 driven LEDS.
+ *
+ * Copyright(C) 2007, 2008 Wolfson Microelectronics PLC.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/mfd/wm8350/pmic.h>
+#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+/* Microamps */
+static const int isink_cur[] = {
+	4,
+	5,
+	6,
+	7,
+	8,
+	10,
+	11,
+	14,
+	16,
+	19,
+	23,
+	27,
+	32,
+	39,
+	46,
+	54,
+	65,
+	77,
+	92,
+	109,
+	130,
+	154,
+	183,
+	218,
+	259,
+	308,
+	367,
+	436,
+	518,
+	616,
+	733,
+	872,
+	1037,
+	1233,
+	1466,
+	1744,
+	2073,
+	2466,
+	2933,
+	3487,
+	4147,
+	4932,
+	5865,
+	6975,
+	8294,
+	9864,
+	11730,
+	13949,
+	16589,
+	19728,
+	23460,
+	27899,
+	33178,
+	39455,
+	46920,
+	55798,
+	66355,
+	78910,
+	93840,
+	111596,
+	132710,
+	157820,
+	187681,
+	223191
+};
+
+#define to_wm8350_led(led_cdev) \
+	container_of(led_cdev, struct wm8350_led, cdev)
+
+static void wm8350_led_enable(struct wm8350_led *led)
+{
+	int ret;
+
+	if (led->enabled)
+		return;
+
+	ret = regulator_enable(led->isink);
+	if (ret != 0) {
+		dev_err(led->cdev.dev, "Failed to enable ISINK: %d\n", ret);
+		return;
+	}
+
+	ret = regulator_enable(led->dcdc);
+	if (ret != 0) {
+		dev_err(led->cdev.dev, "Failed to enable DCDC: %d\n", ret);
+		regulator_disable(led->isink);
+		return;
+	}
+
+	led->enabled = 1;
+}
+
+static void wm8350_led_disable(struct wm8350_led *led)
+{
+	int ret;
+
+	if (!led->enabled)
+		return;
+
+	ret = regulator_disable(led->dcdc);
+	if (ret != 0) {
+		dev_err(led->cdev.dev, "Failed to disable DCDC: %d\n", ret);
+		return;
+	}
+
+	ret = regulator_disable(led->isink);
+	if (ret != 0) {
+		dev_err(led->cdev.dev, "Failed to disable ISINK: %d\n", ret);
+		ret = regulator_enable(led->dcdc);
+		if (ret != 0)
+			dev_err(led->cdev.dev, "Failed to reenable DCDC: %d\n",
+				ret);
+		return;
+	}
+
+	led->enabled = 0;
+}
+
+static void led_work(struct work_struct *work)
+{
+	struct wm8350_led *led = container_of(work, struct wm8350_led, work);
+	int ret;
+	int uA;
+	unsigned long flags;
+
+	mutex_lock(&led->mutex);
+
+	spin_lock_irqsave(&led->value_lock, flags);
+
+	if (led->value == LED_OFF) {
+		spin_unlock_irqrestore(&led->value_lock, flags);
+		wm8350_led_disable(led);
+		goto out;
+	}
+
+	/* This scales linearly into the index of valid current
+	 * settings which results in a linear scaling of perceived
+	 * brightness due to the non-linear current settings provided
+	 * by the hardware.
+	 */
+	uA = (led->max_uA_index * led->value) / LED_FULL;
+	spin_unlock_irqrestore(&led->value_lock, flags);
+	BUG_ON(uA >= ARRAY_SIZE(isink_cur));
+
+	ret = regulator_set_current_limit(led->isink, isink_cur[uA],
+					  isink_cur[uA]);
+	if (ret != 0)
+		dev_err(led->cdev.dev, "Failed to set %duA: %d\n",
+			isink_cur[uA], ret);
+
+	wm8350_led_enable(led);
+
+out:
+	mutex_unlock(&led->mutex);
+}
+
+static void wm8350_led_set(struct led_classdev *led_cdev,
+			   enum led_brightness value)
+{
+	struct wm8350_led *led = to_wm8350_led(led_cdev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&led->value_lock, flags);
+	led->value = value;
+	schedule_work(&led->work);
+	spin_unlock_irqrestore(&led->value_lock, flags);
+}
+
+static void wm8350_led_shutdown(struct platform_device *pdev)
+{
+	struct wm8350_led *led = platform_get_drvdata(pdev);
+
+	mutex_lock(&led->mutex);
+	led->value = LED_OFF;
+	wm8350_led_disable(led);
+	mutex_unlock(&led->mutex);
+}
+
+static int wm8350_led_probe(struct platform_device *pdev)
+{
+	struct regulator *isink, *dcdc;
+	struct wm8350_led *led;
+	struct wm8350_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	int i;
+
+	if (pdata == NULL) {
+		dev_err(&pdev->dev, "no platform data\n");
+		return -ENODEV;
+	}
+
+	if (pdata->max_uA < isink_cur[0]) {
+		dev_err(&pdev->dev, "Invalid maximum current %duA\n",
+			pdata->max_uA);
+		return -EINVAL;
+	}
+
+	isink = devm_regulator_get(&pdev->dev, "led_isink");
+	if (IS_ERR(isink)) {
+		dev_err(&pdev->dev, "%s: can't get ISINK\n", __func__);
+		return PTR_ERR(isink);
+	}
+
+	dcdc = devm_regulator_get(&pdev->dev, "led_vcc");
+	if (IS_ERR(dcdc)) {
+		dev_err(&pdev->dev, "%s: can't get DCDC\n", __func__);
+		return PTR_ERR(dcdc);
+	}
+
+	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
+	if (led == NULL)
+		return -ENOMEM;
+
+	led->cdev.brightness_set = wm8350_led_set;
+	led->cdev.default_trigger = pdata->default_trigger;
+	led->cdev.name = pdata->name;
+	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
+	led->enabled = regulator_is_enabled(isink);
+	led->isink = isink;
+	led->dcdc = dcdc;
+
+	for (i = 0; i < ARRAY_SIZE(isink_cur) - 1; i++)
+		if (isink_cur[i] >= pdata->max_uA)
+			break;
+	led->max_uA_index = i;
+	if (pdata->max_uA != isink_cur[i])
+		dev_warn(&pdev->dev,
+			 "Maximum current %duA is not directly supported,"
+			 " check platform data\n",
+			 pdata->max_uA);
+
+	spin_lock_init(&led->value_lock);
+	mutex_init(&led->mutex);
+	INIT_WORK(&led->work, led_work);
+	led->value = LED_OFF;
+	platform_set_drvdata(pdev, led);
+
+	return led_classdev_register(&pdev->dev, &led->cdev);
+}
+
+static int wm8350_led_remove(struct platform_device *pdev)
+{
+	struct wm8350_led *led = platform_get_drvdata(pdev);
+
+	led_classdev_unregister(&led->cdev);
+	flush_work(&led->work);
+	wm8350_led_disable(led);
+	return 0;
+}
+
+static struct platform_driver wm8350_led_driver = {
+	.driver = {
+		   .name = "wm8350-led",
+		   .owner = THIS_MODULE,
+		   },
+	.probe = wm8350_led_probe,
+	.remove = wm8350_led_remove,
+	.shutdown = wm8350_led_shutdown,
+};
+
+module_platform_driver(wm8350_led_driver);
+
+MODULE_AUTHOR("Mark Brown");
+MODULE_DESCRIPTION("WM8350 LED driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:wm8350-led");

drivers/leds/leds-wrap.c

@@ -0,0 +1,154 @@
+/*
+ * LEDs driver for PCEngines WRAP
+ *
+ * Copyright (C) 2006 Kristian Kielhofner <kris@krisk.org>
+ *
+ * Based on leds-net48xx.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/scx200_gpio.h>
+#include <linux/module.h>
+
+#define DRVNAME "wrap-led"
+#define WRAP_POWER_LED_GPIO	2
+#define WRAP_ERROR_LED_GPIO	3
+#define WRAP_EXTRA_LED_GPIO	18
+
+static struct platform_device *pdev;
+
+static void wrap_power_led_set(struct led_classdev *led_cdev,
+		enum led_brightness value)
+{
+	if (value)
+		scx200_gpio_set_low(WRAP_POWER_LED_GPIO);
+	else
+		scx200_gpio_set_high(WRAP_POWER_LED_GPIO);
+}
+
+static void wrap_error_led_set(struct led_classdev *led_cdev,
+		enum led_brightness value)
+{
+	if (value)
+		scx200_gpio_set_low(WRAP_ERROR_LED_GPIO);
+	else
+		scx200_gpio_set_high(WRAP_ERROR_LED_GPIO);
+}
+
+static void wrap_extra_led_set(struct led_classdev *led_cdev,
+		enum led_brightness value)
+{
+	if (value)
+		scx200_gpio_set_low(WRAP_EXTRA_LED_GPIO);
+	else
+		scx200_gpio_set_high(WRAP_EXTRA_LED_GPIO);
+}
+
+static struct led_classdev wrap_power_led = {
+	.name			= "wrap::power",
+	.brightness_set		= wrap_power_led_set,
+	.default_trigger	= "default-on",
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static struct led_classdev wrap_error_led = {
+	.name		= "wrap::error",
+	.brightness_set	= wrap_error_led_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static struct led_classdev wrap_extra_led = {
+	.name           = "wrap::extra",
+	.brightness_set = wrap_extra_led_set,
+	.flags			= LED_CORE_SUSPENDRESUME,
+};
+
+static int wrap_led_probe(struct platform_device *pdev)
+{
+	int ret;
+
+	ret = led_classdev_register(&pdev->dev, &wrap_power_led);
+	if (ret < 0)
+		return ret;
+
+	ret = led_classdev_register(&pdev->dev, &wrap_error_led);
+	if (ret < 0)
+		goto err1;
+
+	ret = led_classdev_register(&pdev->dev, &wrap_extra_led);
+	if (ret < 0)
+		goto err2;
+
+	return ret;
+
+err2:
+	led_classdev_unregister(&wrap_error_led);
+err1:
+	led_classdev_unregister(&wrap_power_led);
+
+	return ret;
+}
+
+static int wrap_led_remove(struct platform_device *pdev)
+{
+	led_classdev_unregister(&wrap_power_led);
+	led_classdev_unregister(&wrap_error_led);
+	led_classdev_unregister(&wrap_extra_led);
+	return 0;
+}
+
+static struct platform_driver wrap_led_driver = {
+	.probe		= wrap_led_probe,
+	.remove		= wrap_led_remove,
+	.driver		= {
+		.name		= DRVNAME,
+		.owner		= THIS_MODULE,
+	},
+};
+
+static int __init wrap_led_init(void)
+{
+	int ret;
+
+	if (!scx200_gpio_present()) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	ret = platform_driver_register(&wrap_led_driver);
+	if (ret < 0)
+		goto out;
+
+	pdev = platform_device_register_simple(DRVNAME, -1, NULL, 0);
+	if (IS_ERR(pdev)) {
+		ret = PTR_ERR(pdev);
+		platform_driver_unregister(&wrap_led_driver);
+		goto out;
+	}
+
+out:
+	return ret;
+}
+
+static void __exit wrap_led_exit(void)
+{
+	platform_device_unregister(pdev);
+	platform_driver_unregister(&wrap_led_driver);
+}
+
+module_init(wrap_led_init);
+module_exit(wrap_led_exit);
+
+MODULE_AUTHOR("Kristian Kielhofner <kris@krisk.org>");
+MODULE_DESCRIPTION("PCEngines WRAP LED driver");
+MODULE_LICENSE("GPL");
+

drivers/leds/leds.h

@@ -0,0 +1,63 @@
+/*
+ * LED Core
+ *
+ * Copyright 2005 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#ifndef __LEDS_H_INCLUDED
+#define __LEDS_H_INCLUDED
+
+#include <linux/device.h>
+#include <linux/rwsem.h>
+#include <linux/leds.h>
+
+static inline void __led_set_brightness(struct led_classdev *led_cdev,
+					enum led_brightness value)
+{
+	if (value > led_cdev->max_brightness)
+		value = led_cdev->max_brightness;
+	led_cdev->brightness = value;
+	if (!(led_cdev->flags & LED_SUSPENDED))
+		led_cdev->brightness_set(led_cdev, value);
+}
+
+static inline int led_get_brightness(struct led_classdev *led_cdev)
+{
+	return led_cdev->brightness;
+}
+
+void led_stop_software_blink(struct led_classdev *led_cdev);
+
+extern struct rw_semaphore leds_list_lock;
+extern struct list_head leds_list;
+
+#ifdef CONFIG_LEDS_TRIGGERS
+void led_trigger_set_default(struct led_classdev *led_cdev);
+void led_trigger_set(struct led_classdev *led_cdev,
+			struct led_trigger *trigger);
+void led_trigger_remove(struct led_classdev *led_cdev);
+
+static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
+{
+	return led_cdev->trigger_data;
+}
+
+#else
+#define led_trigger_set_default(x) do {} while (0)
+#define led_trigger_set(x, y) do {} while (0)
+#define led_trigger_remove(x) do {} while (0)
+#define led_get_trigger_data(x) (NULL)
+#endif
+
+ssize_t led_trigger_store(struct device *dev, struct device_attribute *attr,
+			const char *buf, size_t count);
+ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
+			char *buf);
+
+#endif	/* __LEDS_H_INCLUDED */

drivers/leds/trigger/Kconfig

@@ -0,0 +1,111 @@
+menuconfig LEDS_TRIGGERS
+	bool "LED Trigger support"
+	depends on LEDS_CLASS
+	help
+	  This option enables trigger support for the leds class.
+	  These triggers allow kernel events to drive the LEDs and can
+	  be configured via sysfs. If unsure, say Y.
+
+if LEDS_TRIGGERS
+
+config LEDS_TRIGGER_TIMER
+	tristate "LED Timer Trigger"
+	depends on LEDS_TRIGGERS
+	help
+	  This allows LEDs to be controlled by a programmable timer
+	  via sysfs. Some LED hardware can be programmed to start
+	  blinking the LED without any further software interaction.
+	  For more details read Documentation/leds/leds-class.txt.
+
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_ONESHOT
+	tristate "LED One-shot Trigger"
+	depends on LEDS_TRIGGERS
+	help
+	  This allows LEDs to blink in one-shot pulses with parameters
+	  controlled via sysfs.  It's useful to notify the user on
+	  sporadic events, when there are no clear begin and end trap points,
+	  or on dense events, where this blinks the LED at constant rate if
+	  rearmed continuously.
+
+	  It also shows how to use the led_blink_set_oneshot() function.
+
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_IDE_DISK
+	bool "LED IDE Disk Trigger"
+	depends on IDE_GD_ATA
+	depends on LEDS_TRIGGERS
+	help
+	  This allows LEDs to be controlled by IDE disk activity.
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_HEARTBEAT
+	tristate "LED Heartbeat Trigger"
+	depends on LEDS_TRIGGERS
+	help
+	  This allows LEDs to be controlled by a CPU load average.
+	  The flash frequency is a hyperbolic function of the 1-minute
+	  load average.
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_BACKLIGHT
+	tristate "LED backlight Trigger"
+	depends on LEDS_TRIGGERS
+	help
+	  This allows LEDs to be controlled as a backlight device: they
+	  turn off and on when the display is blanked and unblanked.
+
+	  If unsure, say N.
+
+config LEDS_TRIGGER_CPU
+	bool "LED CPU Trigger"
+	depends on LEDS_TRIGGERS
+	help
+	  This allows LEDs to be controlled by active CPUs. This shows
+	  the active CPUs across an array of LEDs so you can see which
+	  CPUs are active on the system at any given moment.
+
+	  If unsure, say N.
+
+config LEDS_TRIGGER_GPIO
+	tristate "LED GPIO Trigger"
+	depends on LEDS_TRIGGERS
+	depends on GPIOLIB
+	help
+	  This allows LEDs to be controlled by gpio events. It's good
+	  when using gpios as switches and triggering the needed LEDs
+	  from there. One use case is n810's keypad LEDs that could
+	  be triggered by this trigger when user slides up to show
+	  keypad.
+
+	  If unsure, say N.
+
+config LEDS_TRIGGER_DEFAULT_ON
+	tristate "LED Default ON Trigger"
+	depends on LEDS_TRIGGERS
+	help
+	  This allows LEDs to be initialised in the ON state.
+	  If unsure, say Y.
+
+comment "iptables trigger is under Netfilter config (LED target)"
+	depends on LEDS_TRIGGERS
+
+config LEDS_TRIGGER_TRANSIENT
+	tristate "LED Transient Trigger"
+	depends on LEDS_TRIGGERS
+	help
+	  This allows one time activation of a transient state on
+	  GPIO/PWM based hardware.
+	  If unsure, say Y.
+
+config LEDS_TRIGGER_CAMERA
+	tristate "LED Camera Flash/Torch Trigger"
+	depends on LEDS_TRIGGERS
+	help
+	  This allows LEDs to be controlled as a camera flash/torch device.
+	  This enables direct flash/torch on/off by the driver, kernel space.
+	  If unsure, say Y.
+
+endif # LEDS_TRIGGERS

drivers/leds/trigger/Makefile

@@ -0,0 +1,10 @@
+obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o
+obj-$(CONFIG_LEDS_TRIGGER_ONESHOT)	+= ledtrig-oneshot.o
+obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK)	+= ledtrig-ide-disk.o
+obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT)	+= ledtrig-heartbeat.o
+obj-$(CONFIG_LEDS_TRIGGER_BACKLIGHT)	+= ledtrig-backlight.o
+obj-$(CONFIG_LEDS_TRIGGER_GPIO)		+= ledtrig-gpio.o
+obj-$(CONFIG_LEDS_TRIGGER_CPU)		+= ledtrig-cpu.o
+obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON)	+= ledtrig-default-on.o
+obj-$(CONFIG_LEDS_TRIGGER_TRANSIENT)	+= ledtrig-transient.o
+obj-$(CONFIG_LEDS_TRIGGER_CAMERA)	+= ledtrig-camera.o

drivers/leds/trigger/ledtrig-backlight.c

@@ -0,0 +1,168 @@
+/*
+ * Backlight emulation LED trigger
+ *
+ * Copyright 2008 (C) Rodolfo Giometti <giometti@linux.it>
+ * Copyright 2008 (C) Eurotech S.p.A. <info@eurotech.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fb.h>
+#include <linux/leds.h>
+#include "../leds.h"
+
+#define BLANK		1
+#define UNBLANK		0
+
+struct bl_trig_notifier {
+	struct led_classdev *led;
+	int brightness;
+	int old_status;
+	struct notifier_block notifier;
+	unsigned invert;
+};
+
+static int fb_notifier_callback(struct notifier_block *p,
+				unsigned long event, void *data)
+{
+	struct bl_trig_notifier *n = container_of(p,
+					struct bl_trig_notifier, notifier);
+	struct led_classdev *led = n->led;
+	struct fb_event *fb_event = data;
+	int *blank;
+	int new_status;
+
+	/* If we aren't interested in this event, skip it immediately ... */
+	if (event != FB_EVENT_BLANK)
+		return 0;
+
+	blank = fb_event->data;
+	new_status = *blank ? BLANK : UNBLANK;
+
+	if (new_status == n->old_status)
+		return 0;
+
+	if ((n->old_status == UNBLANK) ^ n->invert) {
+		n->brightness = led->brightness;
+		__led_set_brightness(led, LED_OFF);
+	} else {
+		__led_set_brightness(led, n->brightness);
+	}
+
+	n->old_status = new_status;
+
+	return 0;
+}
+
+static ssize_t bl_trig_invert_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led = dev_get_drvdata(dev);
+	struct bl_trig_notifier *n = led->trigger_data;
+
+	return sprintf(buf, "%u\n", n->invert);
+}
+
+static ssize_t bl_trig_invert_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t num)
+{
+	struct led_classdev *led = dev_get_drvdata(dev);
+	struct bl_trig_notifier *n = led->trigger_data;
+	unsigned long invert;
+	int ret;
+
+	ret = kstrtoul(buf, 10, &invert);
+	if (ret < 0)
+		return ret;
+
+	if (invert > 1)
+		return -EINVAL;
+
+	n->invert = invert;
+
+	/* After inverting, we need to update the LED. */
+	if ((n->old_status == BLANK) ^ n->invert)
+		__led_set_brightness(led, LED_OFF);
+	else
+		__led_set_brightness(led, n->brightness);
+
+	return num;
+}
+static DEVICE_ATTR(inverted, 0644, bl_trig_invert_show, bl_trig_invert_store);
+
+static void bl_trig_activate(struct led_classdev *led)
+{
+	int ret;
+
+	struct bl_trig_notifier *n;
+
+	n = kzalloc(sizeof(struct bl_trig_notifier), GFP_KERNEL);
+	led->trigger_data = n;
+	if (!n) {
+		dev_err(led->dev, "unable to allocate backlight trigger\n");
+		return;
+	}
+
+	ret = device_create_file(led->dev, &dev_attr_inverted);
+	if (ret)
+		goto err_invert;
+
+	n->led = led;
+	n->brightness = led->brightness;
+	n->old_status = UNBLANK;
+	n->notifier.notifier_call = fb_notifier_callback;
+
+	ret = fb_register_client(&n->notifier);
+	if (ret)
+		dev_err(led->dev, "unable to register backlight trigger\n");
+	led->activated = true;
+
+	return;
+
+err_invert:
+	led->trigger_data = NULL;
+	kfree(n);
+}
+
+static void bl_trig_deactivate(struct led_classdev *led)
+{
+	struct bl_trig_notifier *n =
+		(struct bl_trig_notifier *) led->trigger_data;
+
+	if (led->activated) {
+		device_remove_file(led->dev, &dev_attr_inverted);
+		fb_unregister_client(&n->notifier);
+		kfree(n);
+		led->activated = false;
+	}
+}
+
+static struct led_trigger bl_led_trigger = {
+	.name		= "backlight",
+	.activate	= bl_trig_activate,
+	.deactivate	= bl_trig_deactivate
+};
+
+static int __init bl_trig_init(void)
+{
+	return led_trigger_register(&bl_led_trigger);
+}
+
+static void __exit bl_trig_exit(void)
+{
+	led_trigger_unregister(&bl_led_trigger);
+}
+
+module_init(bl_trig_init);
+module_exit(bl_trig_exit);
+
+MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>");
+MODULE_DESCRIPTION("Backlight emulation LED trigger");
+MODULE_LICENSE("GPL v2");

drivers/leds/trigger/ledtrig-camera.c

@@ -0,0 +1,57 @@
+/*
+ * Camera Flash and Torch On/Off Trigger
+ *
+ * based on ledtrig-ide-disk.c
+ *
+ * Copyright 2013 Texas Instruments
+ *
+ * Author: Milo(Woogyom) Kim <milo.kim@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+
+DEFINE_LED_TRIGGER(ledtrig_flash);
+DEFINE_LED_TRIGGER(ledtrig_torch);
+
+void ledtrig_flash_ctrl(bool on)
+{
+	enum led_brightness brt = on ? LED_FULL : LED_OFF;
+
+	led_trigger_event(ledtrig_flash, brt);
+}
+EXPORT_SYMBOL_GPL(ledtrig_flash_ctrl);
+
+void ledtrig_torch_ctrl(bool on)
+{
+	enum led_brightness brt = on ? LED_FULL : LED_OFF;
+
+	led_trigger_event(ledtrig_torch, brt);
+}
+EXPORT_SYMBOL_GPL(ledtrig_torch_ctrl);
+
+static int __init ledtrig_camera_init(void)
+{
+	led_trigger_register_simple("flash", &ledtrig_flash);
+	led_trigger_register_simple("torch", &ledtrig_torch);
+	return 0;
+}
+module_init(ledtrig_camera_init);
+
+static void __exit ledtrig_camera_exit(void)
+{
+	led_trigger_unregister_simple(ledtrig_torch);
+	led_trigger_unregister_simple(ledtrig_flash);
+}
+module_exit(ledtrig_camera_exit);
+
+MODULE_DESCRIPTION("LED Trigger for Camera Flash/Torch Control");
+MODULE_AUTHOR("Milo Kim");
+MODULE_LICENSE("GPL");

drivers/leds/trigger/ledtrig-cpu.c

@@ -0,0 +1,166 @@
+/*
+ * ledtrig-cpu.c - LED trigger based on CPU activity
+ *
+ * This LED trigger will be registered for each possible CPU and named as
+ * cpu0, cpu1, cpu2, cpu3, etc.
+ *
+ * It can be bound to any LED just like other triggers using either a
+ * board file or via sysfs interface.
+ *
+ * An API named ledtrig_cpu is exported for any user, who want to add CPU
+ * activity indication in their code
+ *
+ * Copyright 2011 Linus Walleij <linus.walleij@linaro.org>
+ * Copyright 2011 - 2012 Bryan Wu <bryan.wu@canonical.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/percpu.h>
+#include <linux/syscore_ops.h>
+#include <linux/rwsem.h>
+#include <linux/cpu.h>
+#include "../leds.h"
+
+#define MAX_NAME_LEN	8
+
+struct led_trigger_cpu {
+	char name[MAX_NAME_LEN];
+	struct led_trigger *_trig;
+};
+
+static DEFINE_PER_CPU(struct led_trigger_cpu, cpu_trig);
+
+/**
+ * ledtrig_cpu - emit a CPU event as a trigger
+ * @evt: CPU event to be emitted
+ *
+ * Emit a CPU event on a CPU core, which will trigger a
+ * binded LED to turn on or turn off.
+ */
+void ledtrig_cpu(enum cpu_led_event ledevt)
+{
+	struct led_trigger_cpu *trig = this_cpu_ptr(&cpu_trig);
+
+	/* Locate the correct CPU LED */
+	switch (ledevt) {
+	case CPU_LED_IDLE_END:
+	case CPU_LED_START:
+		/* Will turn the LED on, max brightness */
+		led_trigger_event(trig->_trig, LED_FULL);
+		break;
+
+	case CPU_LED_IDLE_START:
+	case CPU_LED_STOP:
+	case CPU_LED_HALTED:
+		/* Will turn the LED off */
+		led_trigger_event(trig->_trig, LED_OFF);
+		break;
+
+	default:
+		/* Will leave the LED as it is */
+		break;
+	}
+}
+EXPORT_SYMBOL(ledtrig_cpu);
+
+static int ledtrig_cpu_syscore_suspend(void)
+{
+	ledtrig_cpu(CPU_LED_STOP);
+	return 0;
+}
+
+static void ledtrig_cpu_syscore_resume(void)
+{
+	ledtrig_cpu(CPU_LED_START);
+}
+
+static void ledtrig_cpu_syscore_shutdown(void)
+{
+	ledtrig_cpu(CPU_LED_HALTED);
+}
+
+static struct syscore_ops ledtrig_cpu_syscore_ops = {
+	.shutdown	= ledtrig_cpu_syscore_shutdown,
+	.suspend	= ledtrig_cpu_syscore_suspend,
+	.resume		= ledtrig_cpu_syscore_resume,
+};
+
+static int ledtrig_cpu_notify(struct notifier_block *self,
+					   unsigned long action, void *hcpu)
+{
+	switch (action & ~CPU_TASKS_FROZEN) {
+	case CPU_STARTING:
+		ledtrig_cpu(CPU_LED_START);
+		break;
+	case CPU_DYING:
+		ledtrig_cpu(CPU_LED_STOP);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+
+static struct notifier_block ledtrig_cpu_nb = {
+	.notifier_call = ledtrig_cpu_notify,
+};
+
+static int __init ledtrig_cpu_init(void)
+{
+	int cpu;
+
+	/* Supports up to 9999 cpu cores */
+	BUILD_BUG_ON(CONFIG_NR_CPUS > 9999);
+
+	/*
+	 * Registering CPU led trigger for each CPU core here
+	 * ignores CPU hotplug, but after this CPU hotplug works
+	 * fine with this trigger.
+	 */
+	for_each_possible_cpu(cpu) {
+		struct led_trigger_cpu *trig = &per_cpu(cpu_trig, cpu);
+
+		snprintf(trig->name, MAX_NAME_LEN, "cpu%d", cpu);
+
+		led_trigger_register_simple(trig->name, &trig->_trig);
+	}
+
+	register_syscore_ops(&ledtrig_cpu_syscore_ops);
+	register_cpu_notifier(&ledtrig_cpu_nb);
+
+	pr_info("ledtrig-cpu: registered to indicate activity on CPUs\n");
+
+	return 0;
+}
+module_init(ledtrig_cpu_init);
+
+static void __exit ledtrig_cpu_exit(void)
+{
+	int cpu;
+
+	unregister_cpu_notifier(&ledtrig_cpu_nb);
+
+	for_each_possible_cpu(cpu) {
+		struct led_trigger_cpu *trig = &per_cpu(cpu_trig, cpu);
+
+		led_trigger_unregister_simple(trig->_trig);
+		trig->_trig = NULL;
+		memset(trig->name, 0, MAX_NAME_LEN);
+	}
+
+	unregister_syscore_ops(&ledtrig_cpu_syscore_ops);
+}
+module_exit(ledtrig_cpu_exit);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@linaro.org>");
+MODULE_AUTHOR("Bryan Wu <bryan.wu@canonical.com>");
+MODULE_DESCRIPTION("CPU LED trigger");
+MODULE_LICENSE("GPL");

drivers/leds/trigger/ledtrig-default-on.c

@@ -0,0 +1,45 @@
+/*
+ * LED Kernel Default ON Trigger
+ *
+ * Copyright 2008 Nick Forbes <nick.forbes@incepta.com>
+ *
+ * Based on Richard Purdie's ledtrig-timer.c.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+#include "../leds.h"
+
+static void defon_trig_activate(struct led_classdev *led_cdev)
+{
+	__led_set_brightness(led_cdev, led_cdev->max_brightness);
+}
+
+static struct led_trigger defon_led_trigger = {
+	.name     = "default-on",
+	.activate = defon_trig_activate,
+};
+
+static int __init defon_trig_init(void)
+{
+	return led_trigger_register(&defon_led_trigger);
+}
+
+static void __exit defon_trig_exit(void)
+{
+	led_trigger_unregister(&defon_led_trigger);
+}
+
+module_init(defon_trig_init);
+module_exit(defon_trig_exit);
+
+MODULE_AUTHOR("Nick Forbes <nick.forbes@incepta.com>");
+MODULE_DESCRIPTION("Default-ON LED trigger");
+MODULE_LICENSE("GPL");

drivers/leds/trigger/ledtrig-gpio.c

@@ -0,0 +1,253 @@
+/*
+ * ledtrig-gio.c - LED Trigger Based on GPIO events
+ *
+ * Copyright 2009 Felipe Balbi <me@felipebalbi.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/gpio.h>
+#include <linux/interrupt.h>
+#include <linux/workqueue.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include "../leds.h"
+
+struct gpio_trig_data {
+	struct led_classdev *led;
+	struct work_struct work;
+
+	unsigned desired_brightness;	/* desired brightness when led is on */
+	unsigned inverted;		/* true when gpio is inverted */
+	unsigned gpio;			/* gpio that triggers the leds */
+};
+
+static irqreturn_t gpio_trig_irq(int irq, void *_led)
+{
+	struct led_classdev *led = _led;
+	struct gpio_trig_data *gpio_data = led->trigger_data;
+
+	/* just schedule_work since gpio_get_value can sleep */
+	schedule_work(&gpio_data->work);
+
+	return IRQ_HANDLED;
+};
+
+static void gpio_trig_work(struct work_struct *work)
+{
+	struct gpio_trig_data *gpio_data = container_of(work,
+			struct gpio_trig_data, work);
+	int tmp;
+
+	if (!gpio_data->gpio)
+		return;
+
+	tmp = gpio_get_value_cansleep(gpio_data->gpio);
+	if (gpio_data->inverted)
+		tmp = !tmp;
+
+	if (tmp) {
+		if (gpio_data->desired_brightness)
+			__led_set_brightness(gpio_data->led,
+					   gpio_data->desired_brightness);
+		else
+			__led_set_brightness(gpio_data->led, LED_FULL);
+	} else {
+		__led_set_brightness(gpio_data->led, LED_OFF);
+	}
+}
+
+static ssize_t gpio_trig_brightness_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led = dev_get_drvdata(dev);
+	struct gpio_trig_data *gpio_data = led->trigger_data;
+
+	return sprintf(buf, "%u\n", gpio_data->desired_brightness);
+}
+
+static ssize_t gpio_trig_brightness_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t n)
+{
+	struct led_classdev *led = dev_get_drvdata(dev);
+	struct gpio_trig_data *gpio_data = led->trigger_data;
+	unsigned desired_brightness;
+	int ret;
+
+	ret = sscanf(buf, "%u", &desired_brightness);
+	if (ret < 1 || desired_brightness > 255) {
+		dev_err(dev, "invalid value\n");
+		return -EINVAL;
+	}
+
+	gpio_data->desired_brightness = desired_brightness;
+
+	return n;
+}
+static DEVICE_ATTR(desired_brightness, 0644, gpio_trig_brightness_show,
+		gpio_trig_brightness_store);
+
+static ssize_t gpio_trig_inverted_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led = dev_get_drvdata(dev);
+	struct gpio_trig_data *gpio_data = led->trigger_data;
+
+	return sprintf(buf, "%u\n", gpio_data->inverted);
+}
+
+static ssize_t gpio_trig_inverted_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t n)
+{
+	struct led_classdev *led = dev_get_drvdata(dev);
+	struct gpio_trig_data *gpio_data = led->trigger_data;
+	unsigned long inverted;
+	int ret;
+
+	ret = kstrtoul(buf, 10, &inverted);
+	if (ret < 0)
+		return ret;
+
+	if (inverted > 1)
+		return -EINVAL;
+
+	gpio_data->inverted = inverted;
+
+	/* After inverting, we need to update the LED. */
+	schedule_work(&gpio_data->work);
+
+	return n;
+}
+static DEVICE_ATTR(inverted, 0644, gpio_trig_inverted_show,
+		gpio_trig_inverted_store);
+
+static ssize_t gpio_trig_gpio_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led = dev_get_drvdata(dev);
+	struct gpio_trig_data *gpio_data = led->trigger_data;
+
+	return sprintf(buf, "%u\n", gpio_data->gpio);
+}
+
+static ssize_t gpio_trig_gpio_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t n)
+{
+	struct led_classdev *led = dev_get_drvdata(dev);
+	struct gpio_trig_data *gpio_data = led->trigger_data;
+	unsigned gpio;
+	int ret;
+
+	ret = sscanf(buf, "%u", &gpio);
+	if (ret < 1) {
+		dev_err(dev, "couldn't read gpio number\n");
+		flush_work(&gpio_data->work);
+		return -EINVAL;
+	}
+
+	if (gpio_data->gpio == gpio)
+		return n;
+
+	if (!gpio) {
+		if (gpio_data->gpio != 0)
+			free_irq(gpio_to_irq(gpio_data->gpio), led);
+		gpio_data->gpio = 0;
+		return n;
+	}
+
+	ret = request_irq(gpio_to_irq(gpio), gpio_trig_irq,
+			IRQF_SHARED | IRQF_TRIGGER_RISING
+			| IRQF_TRIGGER_FALLING, "ledtrig-gpio", led);
+	if (ret) {
+		dev_err(dev, "request_irq failed with error %d\n", ret);
+	} else {
+		if (gpio_data->gpio != 0)
+			free_irq(gpio_to_irq(gpio_data->gpio), led);
+		gpio_data->gpio = gpio;
+	}
+
+	return ret ? ret : n;
+}
+static DEVICE_ATTR(gpio, 0644, gpio_trig_gpio_show, gpio_trig_gpio_store);
+
+static void gpio_trig_activate(struct led_classdev *led)
+{
+	struct gpio_trig_data *gpio_data;
+	int ret;
+
+	gpio_data = kzalloc(sizeof(*gpio_data), GFP_KERNEL);
+	if (!gpio_data)
+		return;
+
+	ret = device_create_file(led->dev, &dev_attr_gpio);
+	if (ret)
+		goto err_gpio;
+
+	ret = device_create_file(led->dev, &dev_attr_inverted);
+	if (ret)
+		goto err_inverted;
+
+	ret = device_create_file(led->dev, &dev_attr_desired_brightness);
+	if (ret)
+		goto err_brightness;
+
+	gpio_data->led = led;
+	led->trigger_data = gpio_data;
+	INIT_WORK(&gpio_data->work, gpio_trig_work);
+	led->activated = true;
+
+	return;
+
+err_brightness:
+	device_remove_file(led->dev, &dev_attr_inverted);
+
+err_inverted:
+	device_remove_file(led->dev, &dev_attr_gpio);
+
+err_gpio:
+	kfree(gpio_data);
+}
+
+static void gpio_trig_deactivate(struct led_classdev *led)
+{
+	struct gpio_trig_data *gpio_data = led->trigger_data;
+
+	if (led->activated) {
+		device_remove_file(led->dev, &dev_attr_gpio);
+		device_remove_file(led->dev, &dev_attr_inverted);
+		device_remove_file(led->dev, &dev_attr_desired_brightness);
+		flush_work(&gpio_data->work);
+		if (gpio_data->gpio != 0)
+			free_irq(gpio_to_irq(gpio_data->gpio), led);
+		kfree(gpio_data);
+		led->activated = false;
+	}
+}
+
+static struct led_trigger gpio_led_trigger = {
+	.name		= "gpio",
+	.activate	= gpio_trig_activate,
+	.deactivate	= gpio_trig_deactivate,
+};
+
+static int __init gpio_trig_init(void)
+{
+	return led_trigger_register(&gpio_led_trigger);
+}
+module_init(gpio_trig_init);
+
+static void __exit gpio_trig_exit(void)
+{
+	led_trigger_unregister(&gpio_led_trigger);
+}
+module_exit(gpio_trig_exit);
+
+MODULE_AUTHOR("Felipe Balbi <me@felipebalbi.com>");
+MODULE_DESCRIPTION("GPIO LED trigger");
+MODULE_LICENSE("GPL");

drivers/leds/trigger/ledtrig-heartbeat.c

@@ -0,0 +1,161 @@
+/*
+ * LED Heartbeat Trigger
+ *
+ * Copyright (C) 2006 Atsushi Nemoto <anemo@mba.ocn.ne.jp>
+ *
+ * Based on Richard Purdie's ledtrig-timer.c and some arch's
+ * CONFIG_HEARTBEAT code.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/sched.h>
+#include <linux/leds.h>
+#include <linux/reboot.h>
+#include "../leds.h"
+
+static int panic_heartbeats;
+
+struct heartbeat_trig_data {
+	unsigned int phase;
+	unsigned int period;
+	struct timer_list timer;
+};
+
+static void led_heartbeat_function(unsigned long data)
+{
+	struct led_classdev *led_cdev = (struct led_classdev *) data;
+	struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data;
+	unsigned long brightness = LED_OFF;
+	unsigned long delay = 0;
+
+	if (unlikely(panic_heartbeats)) {
+		led_set_brightness(led_cdev, LED_OFF);
+		return;
+	}
+
+	/* acts like an actual heart beat -- ie thump-thump-pause... */
+	switch (heartbeat_data->phase) {
+	case 0:
+		/*
+		 * The hyperbolic function below modifies the
+		 * heartbeat period length in dependency of the
+		 * current (1min) load. It goes through the points
+		 * f(0)=1260, f(1)=860, f(5)=510, f(inf)->300.
+		 */
+		heartbeat_data->period = 300 +
+			(6720 << FSHIFT) / (5 * avenrun[0] + (7 << FSHIFT));
+		heartbeat_data->period =
+			msecs_to_jiffies(heartbeat_data->period);
+		delay = msecs_to_jiffies(70);
+		heartbeat_data->phase++;
+		brightness = led_cdev->max_brightness;
+		break;
+	case 1:
+		delay = heartbeat_data->period / 4 - msecs_to_jiffies(70);
+		heartbeat_data->phase++;
+		break;
+	case 2:
+		delay = msecs_to_jiffies(70);
+		heartbeat_data->phase++;
+		brightness = led_cdev->max_brightness;
+		break;
+	default:
+		delay = heartbeat_data->period - heartbeat_data->period / 4 -
+			msecs_to_jiffies(70);
+		heartbeat_data->phase = 0;
+		break;
+	}
+
+	__led_set_brightness(led_cdev, brightness);
+	mod_timer(&heartbeat_data->timer, jiffies + delay);
+}
+
+static void heartbeat_trig_activate(struct led_classdev *led_cdev)
+{
+	struct heartbeat_trig_data *heartbeat_data;
+
+	heartbeat_data = kzalloc(sizeof(*heartbeat_data), GFP_KERNEL);
+	if (!heartbeat_data)
+		return;
+
+	led_cdev->trigger_data = heartbeat_data;
+	setup_timer(&heartbeat_data->timer,
+		    led_heartbeat_function, (unsigned long) led_cdev);
+	heartbeat_data->phase = 0;
+	led_heartbeat_function(heartbeat_data->timer.data);
+	led_cdev->activated = true;
+}
+
+static void heartbeat_trig_deactivate(struct led_classdev *led_cdev)
+{
+	struct heartbeat_trig_data *heartbeat_data = led_cdev->trigger_data;
+
+	if (led_cdev->activated) {
+		del_timer_sync(&heartbeat_data->timer);
+		kfree(heartbeat_data);
+		led_cdev->activated = false;
+	}
+}
+
+static struct led_trigger heartbeat_led_trigger = {
+	.name     = "heartbeat",
+	.activate = heartbeat_trig_activate,
+	.deactivate = heartbeat_trig_deactivate,
+};
+
+static int heartbeat_reboot_notifier(struct notifier_block *nb,
+				     unsigned long code, void *unused)
+{
+	led_trigger_unregister(&heartbeat_led_trigger);
+	return NOTIFY_DONE;
+}
+
+static int heartbeat_panic_notifier(struct notifier_block *nb,
+				     unsigned long code, void *unused)
+{
+	panic_heartbeats = 1;
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block heartbeat_reboot_nb = {
+	.notifier_call = heartbeat_reboot_notifier,
+};
+
+static struct notifier_block heartbeat_panic_nb = {
+	.notifier_call = heartbeat_panic_notifier,
+};
+
+static int __init heartbeat_trig_init(void)
+{
+	int rc = led_trigger_register(&heartbeat_led_trigger);
+
+	if (!rc) {
+		atomic_notifier_chain_register(&panic_notifier_list,
+					       &heartbeat_panic_nb);
+		register_reboot_notifier(&heartbeat_reboot_nb);
+	}
+	return rc;
+}
+
+static void __exit heartbeat_trig_exit(void)
+{
+	unregister_reboot_notifier(&heartbeat_reboot_nb);
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+					 &heartbeat_panic_nb);
+	led_trigger_unregister(&heartbeat_led_trigger);
+}
+
+module_init(heartbeat_trig_init);
+module_exit(heartbeat_trig_exit);
+
+MODULE_AUTHOR("Atsushi Nemoto <anemo@mba.ocn.ne.jp>");
+MODULE_DESCRIPTION("Heartbeat LED trigger");
+MODULE_LICENSE("GPL");

drivers/leds/trigger/ledtrig-ide-disk.c

@@ -0,0 +1,47 @@
+/*
+ * LED IDE-Disk Activity Trigger
+ *
+ * Copyright 2006 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/leds.h>
+
+#define BLINK_DELAY 30
+
+DEFINE_LED_TRIGGER(ledtrig_ide);
+static unsigned long ide_blink_delay = BLINK_DELAY;
+
+void ledtrig_ide_activity(void)
+{
+	led_trigger_blink_oneshot(ledtrig_ide,
+				  &ide_blink_delay, &ide_blink_delay, 0);
+}
+EXPORT_SYMBOL(ledtrig_ide_activity);
+
+static int __init ledtrig_ide_init(void)
+{
+	led_trigger_register_simple("ide-disk", &ledtrig_ide);
+	return 0;
+}
+
+static void __exit ledtrig_ide_exit(void)
+{
+	led_trigger_unregister_simple(ledtrig_ide);
+}
+
+module_init(ledtrig_ide_init);
+module_exit(ledtrig_ide_exit);
+
+MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
+MODULE_DESCRIPTION("LED IDE Disk Activity Trigger");
+MODULE_LICENSE("GPL");

drivers/leds/trigger/ledtrig-oneshot.c

@@ -0,0 +1,204 @@
+/*
+ * One-shot LED Trigger
+ *
+ * Copyright 2012, Fabio Baltieri <fabio.baltieri@gmail.com>
+ *
+ * Based on ledtrig-timer.c by Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+#include "../leds.h"
+
+#define DEFAULT_DELAY 100
+
+struct oneshot_trig_data {
+	unsigned int invert;
+};
+
+static ssize_t led_shot(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data;
+
+	led_blink_set_oneshot(led_cdev,
+			&led_cdev->blink_delay_on, &led_cdev->blink_delay_off,
+			oneshot_data->invert);
+
+	/* content is ignored */
+	return size;
+}
+static ssize_t led_invert_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data;
+
+	return sprintf(buf, "%u\n", oneshot_data->invert);
+}
+
+static ssize_t led_invert_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data;
+	unsigned long state;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &state);
+	if (ret)
+		return ret;
+
+	oneshot_data->invert = !!state;
+
+	if (oneshot_data->invert)
+		__led_set_brightness(led_cdev, LED_FULL);
+	else
+		__led_set_brightness(led_cdev, LED_OFF);
+
+	return size;
+}
+
+static ssize_t led_delay_on_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
+}
+
+static ssize_t led_delay_on_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	unsigned long state;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &state);
+	if (ret)
+		return ret;
+
+	led_cdev->blink_delay_on = state;
+
+	return size;
+}
+static ssize_t led_delay_off_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
+}
+
+static ssize_t led_delay_off_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	unsigned long state;
+	int ret;
+
+	ret = kstrtoul(buf, 0, &state);
+	if (ret)
+		return ret;
+
+	led_cdev->blink_delay_off = state;
+
+	return size;
+}
+
+static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
+static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
+static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
+static DEVICE_ATTR(shot, 0200, NULL, led_shot);
+
+static void oneshot_trig_activate(struct led_classdev *led_cdev)
+{
+	struct oneshot_trig_data *oneshot_data;
+	int rc;
+
+	oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL);
+	if (!oneshot_data)
+		return;
+
+	led_cdev->trigger_data = oneshot_data;
+
+	rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
+	if (rc)
+		goto err_out_trig_data;
+	rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
+	if (rc)
+		goto err_out_delayon;
+	rc = device_create_file(led_cdev->dev, &dev_attr_invert);
+	if (rc)
+		goto err_out_delayoff;
+	rc = device_create_file(led_cdev->dev, &dev_attr_shot);
+	if (rc)
+		goto err_out_invert;
+
+	led_cdev->blink_delay_on = DEFAULT_DELAY;
+	led_cdev->blink_delay_off = DEFAULT_DELAY;
+
+	led_cdev->activated = true;
+
+	return;
+
+err_out_invert:
+	device_remove_file(led_cdev->dev, &dev_attr_invert);
+err_out_delayoff:
+	device_remove_file(led_cdev->dev, &dev_attr_delay_off);
+err_out_delayon:
+	device_remove_file(led_cdev->dev, &dev_attr_delay_on);
+err_out_trig_data:
+	kfree(led_cdev->trigger_data);
+}
+
+static void oneshot_trig_deactivate(struct led_classdev *led_cdev)
+{
+	struct oneshot_trig_data *oneshot_data = led_cdev->trigger_data;
+
+	if (led_cdev->activated) {
+		device_remove_file(led_cdev->dev, &dev_attr_delay_on);
+		device_remove_file(led_cdev->dev, &dev_attr_delay_off);
+		device_remove_file(led_cdev->dev, &dev_attr_invert);
+		device_remove_file(led_cdev->dev, &dev_attr_shot);
+		kfree(oneshot_data);
+		led_cdev->activated = false;
+	}
+
+	/* Stop blinking */
+	led_set_brightness(led_cdev, LED_OFF);
+}
+
+static struct led_trigger oneshot_led_trigger = {
+	.name     = "oneshot",
+	.activate = oneshot_trig_activate,
+	.deactivate = oneshot_trig_deactivate,
+};
+
+static int __init oneshot_trig_init(void)
+{
+	return led_trigger_register(&oneshot_led_trigger);
+}
+
+static void __exit oneshot_trig_exit(void)
+{
+	led_trigger_unregister(&oneshot_led_trigger);
+}
+
+module_init(oneshot_trig_init);
+module_exit(oneshot_trig_exit);
+
+MODULE_AUTHOR("Fabio Baltieri <fabio.baltieri@gmail.com>");
+MODULE_DESCRIPTION("One-shot LED trigger");
+MODULE_LICENSE("GPL");

drivers/leds/trigger/ledtrig-timer.c

@@ -0,0 +1,130 @@
+/*
+ * LED Kernel Timer Trigger
+ *
+ * Copyright 2005-2006 Openedhand Ltd.
+ *
+ * Author: Richard Purdie <rpurdie@openedhand.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/ctype.h>
+#include <linux/leds.h>
+
+static ssize_t led_delay_on_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%lu\n", led_cdev->blink_delay_on);
+}
+
+static ssize_t led_delay_on_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	unsigned long state;
+	ssize_t ret = -EINVAL;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	led_blink_set(led_cdev, &state, &led_cdev->blink_delay_off);
+	led_cdev->blink_delay_on = state;
+
+	return size;
+}
+
+static ssize_t led_delay_off_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+
+	return sprintf(buf, "%lu\n", led_cdev->blink_delay_off);
+}
+
+static ssize_t led_delay_off_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	unsigned long state;
+	ssize_t ret = -EINVAL;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	led_blink_set(led_cdev, &led_cdev->blink_delay_on, &state);
+	led_cdev->blink_delay_off = state;
+
+	return size;
+}
+
+static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
+static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
+
+static void timer_trig_activate(struct led_classdev *led_cdev)
+{
+	int rc;
+
+	led_cdev->trigger_data = NULL;
+
+	rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
+	if (rc)
+		return;
+	rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
+	if (rc)
+		goto err_out_delayon;
+
+	led_blink_set(led_cdev, &led_cdev->blink_delay_on,
+		      &led_cdev->blink_delay_off);
+	led_cdev->activated = true;
+
+	return;
+
+err_out_delayon:
+	device_remove_file(led_cdev->dev, &dev_attr_delay_on);
+}
+
+static void timer_trig_deactivate(struct led_classdev *led_cdev)
+{
+	if (led_cdev->activated) {
+		device_remove_file(led_cdev->dev, &dev_attr_delay_on);
+		device_remove_file(led_cdev->dev, &dev_attr_delay_off);
+		led_cdev->activated = false;
+	}
+
+	/* Stop blinking */
+	led_set_brightness(led_cdev, LED_OFF);
+}
+
+static struct led_trigger timer_led_trigger = {
+	.name     = "timer",
+	.activate = timer_trig_activate,
+	.deactivate = timer_trig_deactivate,
+};
+
+static int __init timer_trig_init(void)
+{
+	return led_trigger_register(&timer_led_trigger);
+}
+
+static void __exit timer_trig_exit(void)
+{
+	led_trigger_unregister(&timer_led_trigger);
+}
+
+module_init(timer_trig_init);
+module_exit(timer_trig_exit);
+
+MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
+MODULE_DESCRIPTION("Timer LED trigger");
+MODULE_LICENSE("GPL");

drivers/leds/trigger/ledtrig-transient.c

@@ -0,0 +1,237 @@
+/*
+ * LED Kernel Transient Trigger
+ *
+ * Copyright (C) 2012 Shuah Khan <shuahkhan@gmail.com>
+ *
+ * Based on Richard Purdie's ledtrig-timer.c and Atsushi Nemoto's
+ * ledtrig-heartbeat.c
+ * Design and use-case input from Jonas Bonn <jonas@southpole.se> and
+ * Neil Brown <neilb@suse.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+/*
+ * Transient trigger allows one shot timer activation. Please refer to
+ * Documentation/leds/ledtrig-transient.txt for details
+*/
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/timer.h>
+#include <linux/leds.h>
+#include "../leds.h"
+
+struct transient_trig_data {
+	int activate;
+	int state;
+	int restore_state;
+	unsigned long duration;
+	struct timer_list timer;
+};
+
+static void transient_timer_function(unsigned long data)
+{
+	struct led_classdev *led_cdev = (struct led_classdev *) data;
+	struct transient_trig_data *transient_data = led_cdev->trigger_data;
+
+	transient_data->activate = 0;
+	__led_set_brightness(led_cdev, transient_data->restore_state);
+}
+
+static ssize_t transient_activate_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct transient_trig_data *transient_data = led_cdev->trigger_data;
+
+	return sprintf(buf, "%d\n", transient_data->activate);
+}
+
+static ssize_t transient_activate_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct transient_trig_data *transient_data = led_cdev->trigger_data;
+	unsigned long state;
+	ssize_t ret;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	if (state != 1 && state != 0)
+		return -EINVAL;
+
+	/* cancel the running timer */
+	if (state == 0 && transient_data->activate == 1) {
+		del_timer(&transient_data->timer);
+		transient_data->activate = state;
+		__led_set_brightness(led_cdev, transient_data->restore_state);
+		return size;
+	}
+
+	/* start timer if there is no active timer */
+	if (state == 1 && transient_data->activate == 0 &&
+	    transient_data->duration != 0) {
+		transient_data->activate = state;
+		__led_set_brightness(led_cdev, transient_data->state);
+		transient_data->restore_state =
+		    (transient_data->state == LED_FULL) ? LED_OFF : LED_FULL;
+		mod_timer(&transient_data->timer,
+			  jiffies + transient_data->duration);
+	}
+
+	/* state == 0 && transient_data->activate == 0
+		timer is not active - just return */
+	/* state == 1 && transient_data->activate == 1
+		timer is already active - just return */
+
+	return size;
+}
+
+static ssize_t transient_duration_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct transient_trig_data *transient_data = led_cdev->trigger_data;
+
+	return sprintf(buf, "%lu\n", transient_data->duration);
+}
+
+static ssize_t transient_duration_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct transient_trig_data *transient_data = led_cdev->trigger_data;
+	unsigned long state;
+	ssize_t ret;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	transient_data->duration = state;
+	return size;
+}
+
+static ssize_t transient_state_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct transient_trig_data *transient_data = led_cdev->trigger_data;
+	int state;
+
+	state = (transient_data->state == LED_FULL) ? 1 : 0;
+	return sprintf(buf, "%d\n", state);
+}
+
+static ssize_t transient_state_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t size)
+{
+	struct led_classdev *led_cdev = dev_get_drvdata(dev);
+	struct transient_trig_data *transient_data = led_cdev->trigger_data;
+	unsigned long state;
+	ssize_t ret;
+
+	ret = kstrtoul(buf, 10, &state);
+	if (ret)
+		return ret;
+
+	if (state != 1 && state != 0)
+		return -EINVAL;
+
+	transient_data->state = (state == 1) ? LED_FULL : LED_OFF;
+	return size;
+}
+
+static DEVICE_ATTR(activate, 0644, transient_activate_show,
+		   transient_activate_store);
+static DEVICE_ATTR(duration, 0644, transient_duration_show,
+		   transient_duration_store);
+static DEVICE_ATTR(state, 0644, transient_state_show, transient_state_store);
+
+static void transient_trig_activate(struct led_classdev *led_cdev)
+{
+	int rc;
+	struct transient_trig_data *tdata;
+
+	tdata = kzalloc(sizeof(struct transient_trig_data), GFP_KERNEL);
+	if (!tdata) {
+		dev_err(led_cdev->dev,
+			"unable to allocate transient trigger\n");
+		return;
+	}
+	led_cdev->trigger_data = tdata;
+
+	rc = device_create_file(led_cdev->dev, &dev_attr_activate);
+	if (rc)
+		goto err_out;
+
+	rc = device_create_file(led_cdev->dev, &dev_attr_duration);
+	if (rc)
+		goto err_out_duration;
+
+	rc = device_create_file(led_cdev->dev, &dev_attr_state);
+	if (rc)
+		goto err_out_state;
+
+	setup_timer(&tdata->timer, transient_timer_function,
+		    (unsigned long) led_cdev);
+	led_cdev->activated = true;
+
+	return;
+
+err_out_state:
+	device_remove_file(led_cdev->dev, &dev_attr_duration);
+err_out_duration:
+	device_remove_file(led_cdev->dev, &dev_attr_activate);
+err_out:
+	dev_err(led_cdev->dev, "unable to register transient trigger\n");
+	led_cdev->trigger_data = NULL;
+	kfree(tdata);
+}
+
+static void transient_trig_deactivate(struct led_classdev *led_cdev)
+{
+	struct transient_trig_data *transient_data = led_cdev->trigger_data;
+
+	if (led_cdev->activated) {
+		del_timer_sync(&transient_data->timer);
+		__led_set_brightness(led_cdev, transient_data->restore_state);
+		device_remove_file(led_cdev->dev, &dev_attr_activate);
+		device_remove_file(led_cdev->dev, &dev_attr_duration);
+		device_remove_file(led_cdev->dev, &dev_attr_state);
+		led_cdev->trigger_data = NULL;
+		led_cdev->activated = false;
+		kfree(transient_data);
+	}
+}
+
+static struct led_trigger transient_trigger = {
+	.name     = "transient",
+	.activate = transient_trig_activate,
+	.deactivate = transient_trig_deactivate,
+};
+
+static int __init transient_trig_init(void)
+{
+	return led_trigger_register(&transient_trigger);
+}
+
+static void __exit transient_trig_exit(void)
+{
+	led_trigger_unregister(&transient_trigger);
+}
+
+module_init(transient_trig_init);
+module_exit(transient_trig_exit);
+
+MODULE_AUTHOR("Shuah Khan <shuahkhan@gmail.com>");
+MODULE_DESCRIPTION("Transient LED trigger");
+MODULE_LICENSE("GPL");