/*
* consumer.h -- SoC Regulator consumer support.
*
* Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
*
* Author: Liam Girdwood <lrg@slimlogic.co.uk>
*
* 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.
*
* Regulator Consumer Interface.
*
* A Power Management Regulator framework for SoC based devices.
* Features:-
* o Voltage and current level control.
* o Operating mode control.
* o Regulator status.
* o sysfs entries for showing client devices and status
*
* EXPERIMENTAL FEATURES:
* Dynamic Regulator operating Mode Switching (DRMS) - allows regulators
* to use most efficient operating mode depending upon voltage and load and
* is transparent to client drivers.
*
* e.g. Devices x,y,z share regulator r. Device x and y draw 20mA each during
* IO and 1mA at idle. Device z draws 100mA when under load and 5mA when
* idling. Regulator r has > 90% efficiency in NORMAL mode at loads > 100mA
* but this drops rapidly to 60% when below 100mA. Regulator r has > 90%
* efficiency in IDLE mode at loads < 10mA. Thus regulator r will operate
* in normal mode for loads > 10mA and in IDLE mode for load <= 10mA.
*
*/
#ifndef __LINUX_REGULATOR_CONSUMER_H_
#define __LINUX_REGULATOR_CONSUMER_H_
#include <linux/device.h>
/*
* Regulator operating modes.
*
* Regulators can run in a variety of different operating modes depending on
* output load. This allows further system power savings by selecting the
* best (and most efficient) regulator mode for a desired load.
*
* Most drivers will only care about NORMAL. The modes below are generic and
* will probably not match the naming convention of your regulator data sheet
* but should match the use cases in the datasheet.
*
* In order of power efficiency (least efficient at top).
*
* Mode Description
* FAST Regulator can handle fast changes in it's load.
* e.g. useful in CPU voltage & frequency scaling where
* load can quickly increase with CPU frequency increases.
*
* NORMAL Normal regulator power supply mode. Most drivers will
* use this mode.
*
* IDLE Regulator runs in a more efficient mode for light
* loads. Can be used for devices that have a low power
* requirement during periods of inactivity. This mode
* may be more noisy than NORMAL and may not be able
* to handle fast load switching.
*
* STANDBY Regulator runs in the most efficient mode for very
* light loads. Can be used by devices when they are
* in a sleep/standby state. This mode is likely to be
* the most noisy and may not be able to handle fast load
* switching.
*
* NOTE: Most regulators will only support a subset of these modes. Some
* will only just support NORMAL.
*
* These modes can be OR'ed together to make up a mask of valid register modes.
*/
#define REGULATOR_MODE_FAST 0x1
#define REGULATOR_MODE_NORMAL 0x2
#define REGULATOR_MODE_IDLE 0x4
#define REGULATOR_MODE_STANDBY 0x8
/*
* Regulator notifier events.
*
* UNDER_VOLTAGE Regulator output is under voltage.
* OVER_CURRENT Regulator output current is too high.
* REGULATION_OUT Regulator output is out of regulation.
* FAIL Regulator output has failed.
* OVER_TEMP Regulator over temp.
* FORCE_DISABLE Regulator forcibly shut down by software.
* VOLTAGE_CHANGE Regulator voltage changed.
* DISABLE Regulator was disabled.
*
* NOTE: These events can be OR'ed together when passed into handler.
*/
#define REGULATOR_EVENT_UNDER_VOLTAGE 0x01
#define REGULATOR_EVENT_OVER_CURRENT 0x02
#define REGULATOR_EVENT_REGULATION_OUT 0x04
#define REGULATOR_EVENT_FAIL 0x08
#define REGULATOR_EVENT_OVER_TEMP 0x10
#define REGULATOR_EVENT_FORCE_DISABLE 0x20
#define REGULATOR_EVENT_VOLTAGE_CHANGE 0x40
#define REGULATOR_EVENT_DISABLE 0x80
struct regulator;
/**
* struct regulator_bulk_data - Data used for bulk regulator operations.
*
* @supply: The name of the supply. Initialised by the user before
* using the bulk regulator APIs.
* @consumer: The regulator consumer for the supply. This will be managed
* by the bulk API.
*
* The regulator APIs provide a series of regulator_bulk_() API calls as
* a convenience to consumers which require multiple supplies. This
* structure is used to manage data for these calls.
*/
struct regulator_bulk_data {
const char *supply;
struct regulator *consumer;
};
#if defined(CONFIG_REGULATOR)
/* regulator get and put */
struct regulator *__must_check regulator_get(struct device *dev,
const char *id);
struct regulator *__must_check regulator_get_exclusive(struct device *dev,
const char *id);
void regulator_put(struct regulator *regulator);
/* regulator output control and status */
int regulator_enable(struct regulator *regulator);
int regulator_disable(struct regulator *regulator);
int regulator_force_disable(struct regulator *regulator);
int regulator_is_enabled(struct regulator *regulator);
int regulator_bulk_get(struct device *dev, int num_consumers,
struct regulator_bulk_data *consumers);
int regulator_bulk_enable(int num_consumers,
struct regulator_bulk_data *consumers);
int regulator_bulk_disable(int num_consumers,
struct regulator_bulk_data *consumers);
void regulator_bulk_free(int num_consumers,
struct regulator_bulk_data *consumers);
int regulator_count_voltages(struct regulator *regulator);
int regulator_list_voltage(struct regulator *regulator, unsigned selector);
int regulator_is_supported_voltage(struct regulator *regulator,
int min_uV, int max_uV);
int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
int regulator_set_voltage_time(struct regulator *regulator,
int old_uV, int new_uV);
int regulator_get_voltage(struct regulator *regulator);
int regulator_sync_voltage(struct regulator *regulator);
int regulator_set_current_limit(struct regulator *regulator,
int min_uA, int max_uA);
int regulator_get_current_limit(struct regulator *regulator);
int regulator_set_mode(struct regulator *regulator, unsigned int mode);
unsigned int regulator_get_mode(struct regulator *regulator);
int regulator_set_optimum_mode(struct regulator *regulator, int load_uA);
/* regulator notifier block */
int regulator_register_notifier(struct regulator *regulator,
struct notifier_block *nb);
int regulator_unregister_notifier(struct regulator *regulator,
struct notifier_block *nb);
/* driver data - core doesn't touch */
void *regulator_get_drvdata(struct regulator *regulator);
void regulator_set_drvdata(struct regulator *regulator, void *data);
#else
/*
* Make sure client drivers will still build on systems with no software
* controllable voltage or current regulators.
*/
static inline struct regulator *__must_check regulator_get(struct device *dev,
const char *id)
{
/* Nothing except the stubbed out regulator API should be
* looking at the value except to check if it is an error
* value. Drivers are free to handle NULL specifically by
* skipping all regulator API calls, but they don't have to.
* Drivers which don't, should make sure they properly handle
* corner cases of the API, such as regulator_get_voltage()
* returning 0.
*/
return NULL;
}
static inline void regulator_put(struct regulator *regulator)
{
}
static inline int regulator_enable(struct regulator *regulator)
{
return 0;
}
static inline int regulator_disable(struct regulator *regulator)
{
return 0;
}
static inline int regulator_is_enabled(struct regulator *regulator)
{
return 1;
}
static inline int regulator_bulk_get(struct device *dev,
int num_consumers,
struct regulator_bulk_data *consumers)
{
return 0;
}
static inline int regulator_bulk_enable(int num_consumers,
struct regulator_bulk_data *consumers)
{
return 0;
}
static inline int regulator_bulk_disable(int num_consumers,
struct regulator_bulk_data *consumers)
{
return 0;
}
static inline void regulator_bulk_free(int num_consumers,
struct regulator_bulk_data *consumers)
{
}
static inline int regulator_set_voltage(struct regulator *regulator,
int min_uV, int max_uV)
{
return 0;
}
static inline int regulator_get_voltage(struct regulator *regulator)
{
return 0;
}
static inline int regulator_set_current_limit(struct regulator *regulator,
int min_uA, int max_uA)
{
return 0;
}
static inline int regulator_get_current_limit(struct regulator *regulator)
{
return 0;
}
static inline int regulator_set_mode(struct regulator *regulator,
unsigned int mode)
{
return 0;
}
static inline unsigned int regulator_get_mode(struct regulator *regulator)
{
return REGULATOR_MODE_NORMAL;
}
static inline int regulator_set_optimum_mode(struct regulator *regulator,
int load_uA)
{
return REGULATOR_MODE_NORMAL;
}
static inline int regulator_register_notifier(struct regulator *regulator,
struct notifier_block *nb)
{
return 0;
}
static inline int regulator_unregister_notifier(struct regulator *regulator,
struct notifier_block *nb)
{
return 0;
}
static inline void *regulator_get_drvdata(struct regulator *regulator)
{
return NULL;
}
static inline void regulator_set_drvdata(struct regulator *regulator,
void *data)
{
}
#endif
#endif