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Fixed MTP to work with TWRP

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Regulator Consumer Driver Interface
===================================
This text describes the regulator interface for consumer device drivers.
Please see overview.txt for a description of the terms used in this text.
1. Consumer Regulator Access (static & dynamic drivers)
=======================================================
A consumer driver can get access to its supply regulator by calling :-
regulator = regulator_get(dev, "Vcc");
The consumer passes in its struct device pointer and power supply ID. The core
then finds the correct regulator by consulting a machine specific lookup table.
If the lookup is successful then this call will return a pointer to the struct
regulator that supplies this consumer.
To release the regulator the consumer driver should call :-
regulator_put(regulator);
Consumers can be supplied by more than one regulator e.g. codec consumer with
analog and digital supplies :-
digital = regulator_get(dev, "Vcc"); /* digital core */
analog = regulator_get(dev, "Avdd"); /* analog */
The regulator access functions regulator_get() and regulator_put() will
usually be called in your device drivers probe() and remove() respectively.
2. Regulator Output Enable & Disable (static & dynamic drivers)
====================================================================
A consumer can enable its power supply by calling:-
int regulator_enable(regulator);
NOTE: The supply may already be enabled before regulator_enabled() is called.
This may happen if the consumer shares the regulator or the regulator has been
previously enabled by bootloader or kernel board initialization code.
A consumer can determine if a regulator is enabled by calling :-
int regulator_is_enabled(regulator);
This will return > zero when the regulator is enabled.
A consumer can disable its supply when no longer needed by calling :-
int regulator_disable(regulator);
NOTE: This may not disable the supply if it's shared with other consumers. The
regulator will only be disabled when the enabled reference count is zero.
Finally, a regulator can be forcefully disabled in the case of an emergency :-
int regulator_force_disable(regulator);
NOTE: this will immediately and forcefully shutdown the regulator output. All
consumers will be powered off.
3. Regulator Voltage Control & Status (dynamic drivers)
======================================================
Some consumer drivers need to be able to dynamically change their supply
voltage to match system operating points. e.g. CPUfreq drivers can scale
voltage along with frequency to save power, SD drivers may need to select the
correct card voltage, etc.
Consumers can control their supply voltage by calling :-
int regulator_set_voltage(regulator, min_uV, max_uV);
Where min_uV and max_uV are the minimum and maximum acceptable voltages in
microvolts.
NOTE: this can be called when the regulator is enabled or disabled. If called
when enabled, then the voltage changes instantly, otherwise the voltage
configuration changes and the voltage is physically set when the regulator is
next enabled.
The regulators configured voltage output can be found by calling :-
int regulator_get_voltage(regulator);
NOTE: get_voltage() will return the configured output voltage whether the
regulator is enabled or disabled and should NOT be used to determine regulator
output state. However this can be used in conjunction with is_enabled() to
determine the regulator physical output voltage.
4. Regulator Current Limit Control & Status (dynamic drivers)
===========================================================
Some consumer drivers need to be able to dynamically change their supply
current limit to match system operating points. e.g. LCD backlight driver can
change the current limit to vary the backlight brightness, USB drivers may want
to set the limit to 500mA when supplying power.
Consumers can control their supply current limit by calling :-
int regulator_set_current_limit(regulator, min_uA, max_uA);
Where min_uA and max_uA are the minimum and maximum acceptable current limit in
microamps.
NOTE: this can be called when the regulator is enabled or disabled. If called
when enabled, then the current limit changes instantly, otherwise the current
limit configuration changes and the current limit is physically set when the
regulator is next enabled.
A regulators current limit can be found by calling :-
int regulator_get_current_limit(regulator);
NOTE: get_current_limit() will return the current limit whether the regulator
is enabled or disabled and should not be used to determine regulator current
load.
5. Regulator Operating Mode Control & Status (dynamic drivers)
=============================================================
Some consumers can further save system power by changing the operating mode of
their supply regulator to be more efficient when the consumers operating state
changes. e.g. consumer driver is idle and subsequently draws less current
Regulator operating mode can be changed indirectly or directly.
Indirect operating mode control.
--------------------------------
Consumer drivers can request a change in their supply regulator operating mode
by calling :-
int regulator_set_optimum_mode(struct regulator *regulator, int load_uA);
This will cause the core to recalculate the total load on the regulator (based
on all its consumers) and change operating mode (if necessary and permitted)
to best match the current operating load.
The load_uA value can be determined from the consumer's datasheet. e.g. most
datasheets have tables showing the maximum current consumed in certain
situations.
Most consumers will use indirect operating mode control since they have no
knowledge of the regulator or whether the regulator is shared with other
consumers.
Direct operating mode control.
------------------------------
Bespoke or tightly coupled drivers may want to directly control regulator
operating mode depending on their operating point. This can be achieved by
calling :-
int regulator_set_mode(struct regulator *regulator, unsigned int mode);
unsigned int regulator_get_mode(struct regulator *regulator);
Direct mode will only be used by consumers that *know* about the regulator and
are not sharing the regulator with other consumers.
6. Regulator Events
===================
Regulators can notify consumers of external events. Events could be received by
consumers under regulator stress or failure conditions.
Consumers can register interest in regulator events by calling :-
int regulator_register_notifier(struct regulator *regulator,
struct notifier_block *nb);
Consumers can unregister interest by calling :-
int regulator_unregister_notifier(struct regulator *regulator,
struct notifier_block *nb);
Regulators use the kernel notifier framework to send event to their interested
consumers.
7. Regulator Direct Register Access
===================================
Some kinds of power management hardware or firmware are designed such that
they need to do low-level hardware access to regulators, with no involvement
from the kernel. Examples of such devices are:
- clocksource with a voltage-controlled oscillator and control logic to change
the supply voltage over I2C to achieve a desired output clock rate
- thermal management firmware that can issue an arbitrary I2C transaction to
perform system poweroff during overtemperature conditions
To set up such a device/firmware, various parameters like I2C address of the
regulator, addresses of various regulator registers etc. need to be configured
to it. The regulator framework provides the following helpers for querying
these details.
Bus-specific details, like I2C addresses or transfer rates are handled by the
regmap framework. To get the regulator's regmap (if supported), use :-
struct regmap *regulator_get_regmap(struct regulator *regulator);
To obtain the hardware register offset and bitmask for the regulator's voltage
selector register, use :-
int regulator_get_hardware_vsel_register(struct regulator *regulator,
unsigned *vsel_reg,
unsigned *vsel_mask);
To convert a regulator framework voltage selector code (used by
regulator_list_voltage) to a hardware-specific voltage selector that can be
directly written to the voltage selector register, use :-
int regulator_list_hardware_vsel(struct regulator *regulator,
unsigned selector);

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Regulator API design notes
==========================
This document provides a brief, partially structured, overview of some
of the design considerations which impact the regulator API design.
Safety
------
- Errors in regulator configuration can have very serious consequences
for the system, potentially including lasting hardware damage.
- It is not possible to automatically determine the power configuration
of the system - software-equivalent variants of the same chip may
have different power requirements, and not all components with power
requirements are visible to software.
=> The API should make no changes to the hardware state unless it has
specific knowledge that these changes are safe to perform on this
particular system.
Consumer use cases
------------------
- The overwhelming majority of devices in a system will have no
requirement to do any runtime configuration of their power beyond
being able to turn it on or off.
- Many of the power supplies in the system will be shared between many
different consumers.
=> The consumer API should be structured so that these use cases are
very easy to handle and so that consumers will work with shared
supplies without any additional effort.

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Regulator Machine Driver Interface
===================================
The regulator machine driver interface is intended for board/machine specific
initialisation code to configure the regulator subsystem.
Consider the following machine :-
Regulator-1 -+-> Regulator-2 --> [Consumer A @ 1.8 - 2.0V]
|
+-> [Consumer B @ 3.3V]
The drivers for consumers A & B must be mapped to the correct regulator in
order to control their power supplies. This mapping can be achieved in machine
initialisation code by creating a struct regulator_consumer_supply for
each regulator.
struct regulator_consumer_supply {
const char *dev_name; /* consumer dev_name() */
const char *supply; /* consumer supply - e.g. "vcc" */
};
e.g. for the machine above
static struct regulator_consumer_supply regulator1_consumers[] = {
{
.dev_name = "dev_name(consumer B)",
.supply = "Vcc",
},};
static struct regulator_consumer_supply regulator2_consumers[] = {
{
.dev = "dev_name(consumer A"),
.supply = "Vcc",
},};
This maps Regulator-1 to the 'Vcc' supply for Consumer B and maps Regulator-2
to the 'Vcc' supply for Consumer A.
Constraints can now be registered by defining a struct regulator_init_data
for each regulator power domain. This structure also maps the consumers
to their supply regulators :-
static struct regulator_init_data regulator1_data = {
.constraints = {
.name = "Regulator-1",
.min_uV = 3300000,
.max_uV = 3300000,
.valid_modes_mask = REGULATOR_MODE_NORMAL,
},
.num_consumer_supplies = ARRAY_SIZE(regulator1_consumers),
.consumer_supplies = regulator1_consumers,
};
The name field should be set to something that is usefully descriptive
for the board for configuration of supplies for other regulators and
for use in logging and other diagnostic output. Normally the name
used for the supply rail in the schematic is a good choice. If no
name is provided then the subsystem will choose one.
Regulator-1 supplies power to Regulator-2. This relationship must be registered
with the core so that Regulator-1 is also enabled when Consumer A enables its
supply (Regulator-2). The supply regulator is set by the supply_regulator
field below and co:-
static struct regulator_init_data regulator2_data = {
.supply_regulator = "Regulator-1",
.constraints = {
.min_uV = 1800000,
.max_uV = 2000000,
.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,
.valid_modes_mask = REGULATOR_MODE_NORMAL,
},
.num_consumer_supplies = ARRAY_SIZE(regulator2_consumers),
.consumer_supplies = regulator2_consumers,
};
Finally the regulator devices must be registered in the usual manner.
static struct platform_device regulator_devices[] = {
{
.name = "regulator",
.id = DCDC_1,
.dev = {
.platform_data = &regulator1_data,
},
},
{
.name = "regulator",
.id = DCDC_2,
.dev = {
.platform_data = &regulator2_data,
},
},
};
/* register regulator 1 device */
platform_device_register(&regulator_devices[0]);
/* register regulator 2 device */
platform_device_register(&regulator_devices[1]);

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Linux voltage and current regulator framework
=============================================
About
=====
This framework is designed to provide a standard kernel interface to control
voltage and current regulators.
The intention is to allow systems to dynamically control regulator power output
in order to save power and prolong battery life. This applies to both voltage
regulators (where voltage output is controllable) and current sinks (where
current limit is controllable).
(C) 2008 Wolfson Microelectronics PLC.
Author: Liam Girdwood <lrg@slimlogic.co.uk>
Nomenclature
============
Some terms used in this document:-
o Regulator - Electronic device that supplies power to other devices.
Most regulators can enable and disable their output whilst
some can control their output voltage and or current.
Input Voltage -> Regulator -> Output Voltage
o PMIC - Power Management IC. An IC that contains numerous regulators
and often contains other subsystems.
o Consumer - Electronic device that is supplied power by a regulator.
Consumers can be classified into two types:-
Static: consumer does not change its supply voltage or
current limit. It only needs to enable or disable its
power supply. Its supply voltage is set by the hardware,
bootloader, firmware or kernel board initialisation code.
Dynamic: consumer needs to change its supply voltage or
current limit to meet operation demands.
o Power Domain - Electronic circuit that is supplied its input power by the
output power of a regulator, switch or by another power
domain.
The supply regulator may be behind a switch(s). i.e.
Regulator -+-> Switch-1 -+-> Switch-2 --> [Consumer A]
| |
| +-> [Consumer B], [Consumer C]
|
+-> [Consumer D], [Consumer E]
That is one regulator and three power domains:
Domain 1: Switch-1, Consumers D & E.
Domain 2: Switch-2, Consumers B & C.
Domain 3: Consumer A.
and this represents a "supplies" relationship:
Domain-1 --> Domain-2 --> Domain-3.
A power domain may have regulators that are supplied power
by other regulators. i.e.
Regulator-1 -+-> Regulator-2 -+-> [Consumer A]
|
+-> [Consumer B]
This gives us two regulators and two power domains:
Domain 1: Regulator-2, Consumer B.
Domain 2: Consumer A.
and a "supplies" relationship:
Domain-1 --> Domain-2
o Constraints - Constraints are used to define power levels for performance
and hardware protection. Constraints exist at three levels:
Regulator Level: This is defined by the regulator hardware
operating parameters and is specified in the regulator
datasheet. i.e.
- voltage output is in the range 800mV -> 3500mV.
- regulator current output limit is 20mA @ 5V but is
10mA @ 10V.
Power Domain Level: This is defined in software by kernel
level board initialisation code. It is used to constrain a
power domain to a particular power range. i.e.
- Domain-1 voltage is 3300mV
- Domain-2 voltage is 1400mV -> 1600mV
- Domain-3 current limit is 0mA -> 20mA.
Consumer Level: This is defined by consumer drivers
dynamically setting voltage or current limit levels.
e.g. a consumer backlight driver asks for a current increase
from 5mA to 10mA to increase LCD illumination. This passes
to through the levels as follows :-
Consumer: need to increase LCD brightness. Lookup and
request next current mA value in brightness table (the
consumer driver could be used on several different
personalities based upon the same reference device).
Power Domain: is the new current limit within the domain
operating limits for this domain and system state (e.g.
battery power, USB power)
Regulator Domains: is the new current limit within the
regulator operating parameters for input/output voltage.
If the regulator request passes all the constraint tests
then the new regulator value is applied.
Design
======
The framework is designed and targeted at SoC based devices but may also be
relevant to non SoC devices and is split into the following four interfaces:-
1. Consumer driver interface.
This uses a similar API to the kernel clock interface in that consumer
drivers can get and put a regulator (like they can with clocks atm) and
get/set voltage, current limit, mode, enable and disable. This should
allow consumers complete control over their supply voltage and current
limit. This also compiles out if not in use so drivers can be reused in
systems with no regulator based power control.
See Documentation/power/regulator/consumer.txt
2. Regulator driver interface.
This allows regulator drivers to register their regulators and provide
operations to the core. It also has a notifier call chain for propagating
regulator events to clients.
See Documentation/power/regulator/regulator.txt
3. Machine interface.
This interface is for machine specific code and allows the creation of
voltage/current domains (with constraints) for each regulator. It can
provide regulator constraints that will prevent device damage through
overvoltage or overcurrent caused by buggy client drivers. It also
allows the creation of a regulator tree whereby some regulators are
supplied by others (similar to a clock tree).
See Documentation/power/regulator/machine.txt
4. Userspace ABI.
The framework also exports a lot of useful voltage/current/opmode data to
userspace via sysfs. This could be used to help monitor device power
consumption and status.
See Documentation/ABI/testing/sysfs-class-regulator

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Regulator Driver Interface
==========================
The regulator driver interface is relatively simple and designed to allow
regulator drivers to register their services with the core framework.
Registration
============
Drivers can register a regulator by calling :-
struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
const struct regulator_config *config);
This will register the regulator's capabilities and operations to the regulator
core.
Regulators can be unregistered by calling :-
void regulator_unregister(struct regulator_dev *rdev);
Regulator Events
================
Regulators can send events (e.g. overtemperature, undervoltage, etc) to
consumer drivers by calling :-
int regulator_notifier_call_chain(struct regulator_dev *rdev,
unsigned long event, void *data);