Fixed MTP to work with TWRP

arch/arm/mach-integrator/leds.c

@@ -0,0 +1,124 @@
+/*
+ * Driver for the 4 user LEDs found on the Integrator AP/CP baseboard
+ * Based on Versatile and RealView machine LED code
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ * Author: Bryan Wu <bryan.wu@canonical.com>
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+
+#include "hardware.h"
+#include "cm.h"
+
+#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
+
+#define ALPHA_REG __io_address(INTEGRATOR_DBG_BASE)
+#define LEDREG	(__io_address(INTEGRATOR_DBG_BASE) + INTEGRATOR_DBG_LEDS_OFFSET)
+
+struct integrator_led {
+	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;
+} integrator_leds[] = {
+	{ "integrator:green0", "heartbeat", },
+	{ "integrator:yellow", },
+	{ "integrator:red", },
+	{ "integrator:green1", },
+	{ "integrator:core_module", "cpu0", },
+};
+
+static void integrator_led_set(struct led_classdev *cdev,
+			      enum led_brightness b)
+{
+	struct integrator_led *led = container_of(cdev,
+						 struct integrator_led, cdev);
+	u32 reg = __raw_readl(LEDREG);
+
+	if (b != LED_OFF)
+		reg |= led->mask;
+	else
+		reg &= ~led->mask;
+
+	while (__raw_readl(ALPHA_REG) & 1)
+		cpu_relax();
+
+	__raw_writel(reg, LEDREG);
+}
+
+static enum led_brightness integrator_led_get(struct led_classdev *cdev)
+{
+	struct integrator_led *led = container_of(cdev,
+						 struct integrator_led, cdev);
+	u32 reg = __raw_readl(LEDREG);
+
+	return (reg & led->mask) ? LED_FULL : LED_OFF;
+}
+
+static void cm_led_set(struct led_classdev *cdev,
+			      enum led_brightness b)
+{
+	if (b != LED_OFF)
+		cm_control(CM_CTRL_LED, CM_CTRL_LED);
+	else
+		cm_control(CM_CTRL_LED, 0);
+}
+
+static enum led_brightness cm_led_get(struct led_classdev *cdev)
+{
+	u32 reg = cm_get();
+
+	return (reg & CM_CTRL_LED) ? LED_FULL : LED_OFF;
+}
+
+static int __init integrator_leds_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(integrator_leds); i++) {
+		struct integrator_led *led;
+
+		led = kzalloc(sizeof(*led), GFP_KERNEL);
+		if (!led)
+			break;
+
+
+		led->cdev.name = integrator_leds[i].name;
+
+		if (i == 4) { /* Setting for LED in core module */
+			led->cdev.brightness_set = cm_led_set;
+			led->cdev.brightness_get = cm_led_get;
+		} else {
+			led->cdev.brightness_set = integrator_led_set;
+			led->cdev.brightness_get = integrator_led_get;
+		}
+
+		led->cdev.default_trigger = integrator_leds[i].trigger;
+		led->mask = BIT(i);
+
+		if (led_classdev_register(NULL, &led->cdev) < 0) {
+			kfree(led);
+			break;
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * Since we may have triggers on any subsystem, defer registration
+ * until after subsystem_init.
+ */
+fs_initcall(integrator_leds_init);
+#endif