include/linux/regulator/consumer.h

   1 /*
   2  * consumer.h -- SoC Regulator consumer support.
   3  *
   4  * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
   5  *
   6  * Author: Liam Girdwood <lg@opensource.wolfsonmicro.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * Regulator Consumer Interface.
  13  *
  14  * A Power Management Regulator framework for SoC based devices.
  15  * Features:-
  16  *   o Voltage and current level control.
  17  *   o Operating mode control.
  18  *   o Regulator status.
  19  *   o sysfs entries for showing client devices and status
  20  *
  21  * EXPERIMENTAL FEATURES:
  22  *   Dynamic Regulator operating Mode Switching (DRMS) - allows regulators
  23  *   to use most efficient operating mode depending upon voltage and load and
  24  *   is transparent to client drivers.
  25  *
  26  *   e.g. Devices x,y,z share regulator r. Device x and y draw 20mA each during
  27  *   IO and 1mA at idle. Device z draws 100mA when under load and 5mA when
  28  *   idling. Regulator r has > 90% efficiency in NORMAL mode at loads > 100mA
  29  *   but this drops rapidly to 60% when below 100mA. Regulator r has > 90%
  30  *   efficiency in IDLE mode at loads < 10mA. Thus regulator r will operate
  31  *   in normal mode for loads > 10mA and in IDLE mode for load <= 10mA.
  32  *
  33  */
  34
  35 #ifndef __LINUX_REGULATOR_CONSUMER_H_
  36 #define __LINUX_REGULATOR_CONSUMER_H_
  37
  38 /*
  39  * Regulator operating modes.
  40  *
  41  * Regulators can run in a variety of different operating modes depending on
  42  * output load. This allows further system power savings by selecting the
  43  * best (and most efficient) regulator mode for a desired load.
  44  *
  45  * Most drivers will only care about NORMAL. The modes below are generic and
  46  * will probably not match the naming convention of your regulator data sheet
  47  * but should match the use cases in the datasheet.
  48  *
  49  * In order of power efficiency (least efficient at top).
  50  *
  51  *  Mode       Description
  52  *  FAST       Regulator can handle fast changes in it's load.
  53  *             e.g. useful in CPU voltage & frequency scaling where
  54  *             load can quickly increase with CPU frequency increases.
  55  *
  56  *  NORMAL     Normal regulator power supply mode. Most drivers will
  57  *             use this mode.
  58  *
  59  *  IDLE       Regulator runs in a more efficient mode for light
  60  *             loads. Can be used for devices that have a low power
  61  *             requirement during periods of inactivity. This mode
  62  *             may be more noisy than NORMAL and may not be able
  63  *             to handle fast load switching.
  64  *
  65  *  STANDBY    Regulator runs in the most efficient mode for very
  66  *             light loads. Can be used by devices when they are
  67  *             in a sleep/standby state. This mode is likely to be
  68  *             the most noisy and may not be able to handle fast load
  69  *             switching.
  70  *
  71  * NOTE: Most regulators will only support a subset of these modes. Some
  72  * will only just support NORMAL.
  73  *
  74  * These modes can be OR'ed together to make up a mask of valid register modes.
  75  */
  76
  77 #define REGULATOR_MODE_FAST                     0x1
  78 #define REGULATOR_MODE_NORMAL                   0x2
  79 #define REGULATOR_MODE_IDLE                     0x4
  80 #define REGULATOR_MODE_STANDBY                  0x8
  81
  82 /*
  83  * Regulator notifier events.
  84  *
  85  * UNDER_VOLTAGE  Regulator output is under voltage.
  86  * OVER_CURRENT   Regulator output current is too high.
  87  * REGULATION_OUT Regulator output is out of regulation.
  88  * FAIL           Regulator output has failed.
  89  * OVER_TEMP      Regulator over temp.
  90  * FORCE_DISABLE  Regulator shut down by software.
  91  *
  92  * NOTE: These events can be OR'ed together when passed into handler.
  93  */
  94
  95 #define REGULATOR_EVENT_UNDER_VOLTAGE           0x01
  96 #define REGULATOR_EVENT_OVER_CURRENT            0x02
  97 #define REGULATOR_EVENT_REGULATION_OUT          0x04
  98 #define REGULATOR_EVENT_FAIL                    0x08
  99 #define REGULATOR_EVENT_OVER_TEMP               0x10
 100 #define REGULATOR_EVENT_FORCE_DISABLE           0x20
 101
 102 struct regulator;
 103
 104 /**
 105  * struct regulator_bulk_data - Data used for bulk regulator operations.
 106  *
 107  * @supply   The name of the supply.  Initialised by the user before
 108  *           using the bulk regulator APIs.
 109  * @consumer The regulator consumer for the supply.  This will be managed
 110  *           by the bulk API.
 111  *
 112  * The regulator APIs provide a series of regulator_bulk_() API calls as
 113  * a convenience to consumers which require multiple supplies.  This
 114  * structure is used to manage data for these calls.
 115  */
 116 struct regulator_bulk_data {
 117         const char *supply;
 118         struct regulator *consumer;
 119 };
 120
 121 #if defined(CONFIG_REGULATOR)
 122
 123 /* regulator get and put */
 124 struct regulator *__must_check regulator_get(struct device *dev,
 125                                              const char *id);
 126 void regulator_put(struct regulator *regulator);
 127
 128 /* regulator output control and status */
 129 int regulator_enable(struct regulator *regulator);
 130 int regulator_disable(struct regulator *regulator);
 131 int regulator_force_disable(struct regulator *regulator);
 132 int regulator_is_enabled(struct regulator *regulator);
 133
 134 int regulator_bulk_get(struct device *dev, int num_consumers,
 135                        struct regulator_bulk_data *consumers);
 136 int regulator_bulk_enable(int num_consumers,
 137                           struct regulator_bulk_data *consumers);
 138 int regulator_bulk_disable(int num_consumers,
 139                            struct regulator_bulk_data *consumers);
 140 void regulator_bulk_free(int num_consumers,
 141                          struct regulator_bulk_data *consumers);
 142
 143 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
 144 int regulator_get_voltage(struct regulator *regulator);
 145 int regulator_set_current_limit(struct regulator *regulator,
 146                                int min_uA, int max_uA);
 147 int regulator_get_current_limit(struct regulator *regulator);
 148
 149 int regulator_set_mode(struct regulator *regulator, unsigned int mode);
 150 unsigned int regulator_get_mode(struct regulator *regulator);
 151 int regulator_set_optimum_mode(struct regulator *regulator, int load_uA);
 152
 153 /* regulator notifier block */
 154 int regulator_register_notifier(struct regulator *regulator,
 155                               struct notifier_block *nb);
 156 int regulator_unregister_notifier(struct regulator *regulator,
 157                                 struct notifier_block *nb);
 158
 159 /* driver data - core doesn't touch */
 160 void *regulator_get_drvdata(struct regulator *regulator);
 161 void regulator_set_drvdata(struct regulator *regulator, void *data);
 162
 163 #else
 164
 165 /*
 166  * Make sure client drivers will still build on systems with no software
 167  * controllable voltage or current regulators.
 168  */
 169 static inline struct regulator *__must_check regulator_get(struct device *dev,
 170         const char *id)
 171 {
 172         /* Nothing except the stubbed out regulator API should be
 173          * looking at the value except to check if it is an error
 174          * value so the actual return value doesn't matter.
 175          */
 176         return (struct regulator *)id;
 177 }
 178 static inline void regulator_put(struct regulator *regulator)
 179 {
 180 }
 181
 182 static inline int regulator_enable(struct regulator *regulator)
 183 {
 184         return 0;
 185 }
 186
 187 static inline int regulator_disable(struct regulator *regulator)
 188 {
 189         return 0;
 190 }
 191
 192 static inline int regulator_is_enabled(struct regulator *regulator)
 193 {
 194         return 1;
 195 }
 196
 197 static inline int regulator_bulk_get(struct device *dev,
 198                                      int num_consumers,
 199                                      struct regulator_bulk_data *consumers)
 200 {
 201         return 0;
 202 }
 203
 204 static inline int regulator_bulk_enable(int num_consumers,
 205                                         struct regulator_bulk_data *consumers)
 206 {
 207         return 0;
 208 }
 209
 210 static inline int regulator_bulk_disable(int num_consumers,
 211                                          struct regulator_bulk_data *consumers)
 212 {
 213         return 0;
 214 }
 215
 216 static inline void regulator_bulk_free(int num_consumers,
 217                                        struct regulator_bulk_data *consumers)
 218 {
 219 }
 220
 221 static inline int regulator_set_voltage(struct regulator *regulator,
 222                                         int min_uV, int max_uV)
 223 {
 224         return 0;
 225 }
 226
 227 static inline int regulator_get_voltage(struct regulator *regulator)
 228 {
 229         return 0;
 230 }
 231
 232 static inline int regulator_set_current_limit(struct regulator *regulator,
 233                                              int min_uA, int max_uA)
 234 {
 235         return 0;
 236 }
 237
 238 static inline int regulator_get_current_limit(struct regulator *regulator)
 239 {
 240         return 0;
 241 }
 242
 243 static inline int regulator_set_mode(struct regulator *regulator,
 244         unsigned int mode)
 245 {
 246         return 0;
 247 }
 248
 249 static inline unsigned int regulator_get_mode(struct regulator *regulator)
 250 {
 251         return REGULATOR_MODE_NORMAL;
 252 }
 253
 254 static inline int regulator_set_optimum_mode(struct regulator *regulator,
 255                                         int load_uA)
 256 {
 257         return REGULATOR_MODE_NORMAL;
 258 }
 259
 260 static inline int regulator_register_notifier(struct regulator *regulator,
 261                               struct notifier_block *nb)
 262 {
 263         return 0;
 264 }
 265
 266 static inline int regulator_unregister_notifier(struct regulator *regulator,
 267                                 struct notifier_block *nb)
 268 {
 269         return 0;
 270 }
 271
 272 static inline void *regulator_get_drvdata(struct regulator *regulator)
 273 {
 274         return NULL;
 275 }
 276
 277 static inline void regulator_set_drvdata(struct regulator *regulator,
 278         void *data)
 279 {
 280 }
 281
 282 #endif
 283
 284 #endif