/*
 * 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_

/*
 * 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 shut down by software.
 * VOLTAGE_CHANGE Regulator voltage changed.
 *
 * 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

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_get_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 so the actual return value doesn't matter.
         */
        return (struct regulator *)id;
}
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