/* * consumer.h -- SoC Regulator consumer support. * * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC. * * Author: Liam Girdwood <lg@opensource.wolfsonmicro.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. * * 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. * * 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 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); 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_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