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 <lrg@slimlogic.co.uk>
   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 struct device;
  39 struct notifier_block;
  40
  41 /*
  42  * Regulator operating modes.
  43  *
  44  * Regulators can run in a variety of different operating modes depending on
  45  * output load. This allows further system power savings by selecting the
  46  * best (and most efficient) regulator mode for a desired load.
  47  *
  48  * Most drivers will only care about NORMAL. The modes below are generic and
  49  * will probably not match the naming convention of your regulator data sheet
  50  * but should match the use cases in the datasheet.
  51  *
  52  * In order of power efficiency (least efficient at top).
  53  *
  54  *  Mode       Description
  55  *  FAST       Regulator can handle fast changes in it's load.
  56  *             e.g. useful in CPU voltage & frequency scaling where
  57  *             load can quickly increase with CPU frequency increases.
  58  *
  59  *  NORMAL     Normal regulator power supply mode. Most drivers will
  60  *             use this mode.
  61  *
  62  *  IDLE       Regulator runs in a more efficient mode for light
  63  *             loads. Can be used for devices that have a low power
  64  *             requirement during periods of inactivity. This mode
  65  *             may be more noisy than NORMAL and may not be able
  66  *             to handle fast load switching.
  67  *
  68  *  STANDBY    Regulator runs in the most efficient mode for very
  69  *             light loads. Can be used by devices when they are
  70  *             in a sleep/standby state. This mode is likely to be
  71  *             the most noisy and may not be able to handle fast load
  72  *             switching.
  73  *
  74  * NOTE: Most regulators will only support a subset of these modes. Some
  75  * will only just support NORMAL.
  76  *
  77  * These modes can be OR'ed together to make up a mask of valid register modes.
  78  */
  79
  80 #define REGULATOR_MODE_FAST                     0x1
  81 #define REGULATOR_MODE_NORMAL                   0x2
  82 #define REGULATOR_MODE_IDLE                     0x4
  83 #define REGULATOR_MODE_STANDBY                  0x8
  84
  85 /*
  86  * Regulator notifier events.
  87  *
  88  * UNDER_VOLTAGE  Regulator output is under voltage.
  89  * OVER_CURRENT   Regulator output current is too high.
  90  * REGULATION_OUT Regulator output is out of regulation.
  91  * FAIL           Regulator output has failed.
  92  * OVER_TEMP      Regulator over temp.
  93  * FORCE_DISABLE  Regulator forcibly shut down by software.
  94  * VOLTAGE_CHANGE Regulator voltage changed.
  95  * DISABLE        Regulator was disabled.
  96  *
  97  * NOTE: These events can be OR'ed together when passed into handler.
  98  */
  99
 100 #define REGULATOR_EVENT_UNDER_VOLTAGE           0x01
 101 #define REGULATOR_EVENT_OVER_CURRENT            0x02
 102 #define REGULATOR_EVENT_REGULATION_OUT          0x04
 103 #define REGULATOR_EVENT_FAIL                    0x08
 104 #define REGULATOR_EVENT_OVER_TEMP               0x10
 105 #define REGULATOR_EVENT_FORCE_DISABLE           0x20
 106 #define REGULATOR_EVENT_VOLTAGE_CHANGE          0x40
 107 #define REGULATOR_EVENT_DISABLE                 0x80
 108
 109 struct regulator;
 110
 111 /**
 112  * struct regulator_bulk_data - Data used for bulk regulator operations.
 113  *
 114  * @supply:   The name of the supply.  Initialised by the user before
 115  *            using the bulk regulator APIs.
 116  * @consumer: The regulator consumer for the supply.  This will be managed
 117  *            by the bulk API.
 118  *
 119  * The regulator APIs provide a series of regulator_bulk_() API calls as
 120  * a convenience to consumers which require multiple supplies.  This
 121  * structure is used to manage data for these calls.
 122  */
 123 struct regulator_bulk_data {
 124         const char *supply;
 125         struct regulator *consumer;
 126
 127         /* private: Internal use */
 128         int ret;
 129 };
 130
 131 #if defined(CONFIG_REGULATOR)
 132
 133 /* regulator get and put */
 134 struct regulator *__must_check regulator_get(struct device *dev,
 135                                              const char *id);
 136 struct regulator *__must_check devm_regulator_get(struct device *dev,
 137                                              const char *id);
 138 struct regulator *__must_check regulator_get_exclusive(struct device *dev,
 139                                                        const char *id);
 140 struct regulator *__must_check devm_regulator_get_exclusive(struct device *dev,
 141                                                         const char *id);
 142 struct regulator *__must_check regulator_get_optional(struct device *dev,
 143                                                       const char *id);
 144 struct regulator *__must_check devm_regulator_get_optional(struct device *dev,
 145                                                            const char *id);
 146 void regulator_put(struct regulator *regulator);
 147 void devm_regulator_put(struct regulator *regulator);
 148
 149 int regulator_register_supply_alias(struct device *dev, const char *id,
 150                                     struct device *alias_dev,
 151                                     const char *alias_id);
 152 void regulator_unregister_supply_alias(struct device *dev, const char *id);
 153
 154 int regulator_bulk_register_supply_alias(struct device *dev, const char **id,
 155                                          struct device *alias_dev,
 156                                          const char **alias_id, int num_id);
 157 void regulator_bulk_unregister_supply_alias(struct device *dev,
 158                                             const char **id, int num_id);
 159
 160 int devm_regulator_register_supply_alias(struct device *dev, const char *id,
 161                                          struct device *alias_dev,
 162                                          const char *alias_id);
 163 void devm_regulator_unregister_supply_alias(struct device *dev,
 164                                             const char *id);
 165
 166 int devm_regulator_bulk_register_supply_alias(struct device *dev,
 167                                               const char **id,
 168                                               struct device *alias_dev,
 169                                               const char **alias_id,
 170                                               int num_id);
 171 void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
 172                                                  const char **id,
 173                                                  int num_id);
 174
 175 /* regulator output control and status */
 176 int __must_check regulator_enable(struct regulator *regulator);
 177 int regulator_disable(struct regulator *regulator);
 178 int regulator_force_disable(struct regulator *regulator);
 179 int regulator_is_enabled(struct regulator *regulator);
 180 int regulator_disable_deferred(struct regulator *regulator, int ms);
 181
 182 int __must_check regulator_bulk_get(struct device *dev, int num_consumers,
 183                                     struct regulator_bulk_data *consumers);
 184 int __must_check devm_regulator_bulk_get(struct device *dev, int num_consumers,
 185                                          struct regulator_bulk_data *consumers);
 186 int __must_check regulator_bulk_enable(int num_consumers,
 187                                        struct regulator_bulk_data *consumers);
 188 int regulator_bulk_disable(int num_consumers,
 189                            struct regulator_bulk_data *consumers);
 190 int regulator_bulk_force_disable(int num_consumers,
 191                            struct regulator_bulk_data *consumers);
 192 void regulator_bulk_free(int num_consumers,
 193                          struct regulator_bulk_data *consumers);
 194
 195 int regulator_can_change_voltage(struct regulator *regulator);
 196 int regulator_count_voltages(struct regulator *regulator);
 197 int regulator_list_voltage(struct regulator *regulator, unsigned selector);
 198 int regulator_is_supported_voltage(struct regulator *regulator,
 199                                    int min_uV, int max_uV);
 200 unsigned int regulator_get_linear_step(struct regulator *regulator);
 201 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
 202 int regulator_set_voltage_time(struct regulator *regulator,
 203                                int old_uV, int new_uV);
 204 int regulator_get_voltage(struct regulator *regulator);
 205 int regulator_sync_voltage(struct regulator *regulator);
 206 int regulator_set_current_limit(struct regulator *regulator,
 207                                int min_uA, int max_uA);
 208 int regulator_get_current_limit(struct regulator *regulator);
 209
 210 int regulator_set_mode(struct regulator *regulator, unsigned int mode);
 211 unsigned int regulator_get_mode(struct regulator *regulator);
 212 int regulator_set_optimum_mode(struct regulator *regulator, int load_uA);
 213
 214 int regulator_allow_bypass(struct regulator *regulator, bool allow);
 215
 216 /* regulator notifier block */
 217 int regulator_register_notifier(struct regulator *regulator,
 218                               struct notifier_block *nb);
 219 int regulator_unregister_notifier(struct regulator *regulator,
 220                                 struct notifier_block *nb);
 221
 222 /* driver data - core doesn't touch */
 223 void *regulator_get_drvdata(struct regulator *regulator);
 224 void regulator_set_drvdata(struct regulator *regulator, void *data);
 225
 226 #else
 227
 228 /*
 229  * Make sure client drivers will still build on systems with no software
 230  * controllable voltage or current regulators.
 231  */
 232 static inline struct regulator *__must_check regulator_get(struct device *dev,
 233         const char *id)
 234 {
 235         /* Nothing except the stubbed out regulator API should be
 236          * looking at the value except to check if it is an error
 237          * value. Drivers are free to handle NULL specifically by
 238          * skipping all regulator API calls, but they don't have to.
 239          * Drivers which don't, should make sure they properly handle
 240          * corner cases of the API, such as regulator_get_voltage()
 241          * returning 0.
 242          */
 243         return NULL;
 244 }
 245
 246 static inline struct regulator *__must_check
 247 devm_regulator_get(struct device *dev, const char *id)
 248 {
 249         return NULL;
 250 }
 251
 252 static inline struct regulator *__must_check
 253 regulator_get_exclusive(struct device *dev, const char *id)
 254 {
 255         return NULL;
 256 }
 257
 258 static inline struct regulator *__must_check
 259 regulator_get_optional(struct device *dev, const char *id)
 260 {
 261         return NULL;
 262 }
 263
 264
 265 static inline struct regulator *__must_check
 266 devm_regulator_get_optional(struct device *dev, const char *id)
 267 {
 268         return NULL;
 269 }
 270
 271 static inline void regulator_put(struct regulator *regulator)
 272 {
 273 }
 274
 275 static inline void devm_regulator_put(struct regulator *regulator)
 276 {
 277 }
 278
 279 static inline int regulator_register_supply_alias(struct device *dev,
 280                                                   const char *id,
 281                                                   struct device *alias_dev,
 282                                                   const char *alias_id)
 283 {
 284         return 0;
 285 }
 286
 287 static inline void regulator_unregister_supply_alias(struct device *dev,
 288                                                     const char *id)
 289 {
 290 }
 291
 292 static inline int regulator_bulk_register_supply_alias(struct device *dev,
 293                                                        const char **id,
 294                                                        struct device *alias_dev,
 295                                                        const char **alias_id,
 296                                                        int num_id)
 297 {
 298         return 0;
 299 }
 300
 301 static inline void regulator_bulk_unregister_supply_alias(struct device *dev,
 302                                                           const char **id,
 303                                                           int num_id)
 304 {
 305 }
 306
 307 static inline int devm_regulator_register_supply_alias(struct device *dev,
 308                                                        const char *id,
 309                                                        struct device *alias_dev,
 310                                                        const char *alias_id)
 311 {
 312         return 0;
 313 }
 314
 315 static inline void devm_regulator_unregister_supply_alias(struct device *dev,
 316                                                           const char *id)
 317 {
 318 }
 319
 320 static inline int devm_regulator_bulk_register_supply_alias(
 321                 struct device *dev, const char **id, struct device *alias_dev,
 322                 const char **alias_id, int num_id)
 323 {
 324         return 0;
 325 }
 326
 327 static inline void devm_regulator_bulk_unregister_supply_alias(
 328                 struct device *dev, const char **id, int num_id)
 329 {
 330 }
 331
 332 static inline int regulator_enable(struct regulator *regulator)
 333 {
 334         return 0;
 335 }
 336
 337 static inline int regulator_disable(struct regulator *regulator)
 338 {
 339         return 0;
 340 }
 341
 342 static inline int regulator_force_disable(struct regulator *regulator)
 343 {
 344         return 0;
 345 }
 346
 347 static inline int regulator_disable_deferred(struct regulator *regulator,
 348                                              int ms)
 349 {
 350         return 0;
 351 }
 352
 353 static inline int regulator_is_enabled(struct regulator *regulator)
 354 {
 355         return 1;
 356 }
 357
 358 static inline int regulator_bulk_get(struct device *dev,
 359                                      int num_consumers,
 360                                      struct regulator_bulk_data *consumers)
 361 {
 362         return 0;
 363 }
 364
 365 static inline int devm_regulator_bulk_get(struct device *dev, int num_consumers,
 366                                           struct regulator_bulk_data *consumers)
 367 {
 368         return 0;
 369 }
 370
 371 static inline int regulator_bulk_enable(int num_consumers,
 372                                         struct regulator_bulk_data *consumers)
 373 {
 374         return 0;
 375 }
 376
 377 static inline int regulator_bulk_disable(int num_consumers,
 378                                          struct regulator_bulk_data *consumers)
 379 {
 380         return 0;
 381 }
 382
 383 static inline int regulator_bulk_force_disable(int num_consumers,
 384                                         struct regulator_bulk_data *consumers)
 385 {
 386         return 0;
 387 }
 388
 389 static inline void regulator_bulk_free(int num_consumers,
 390                                        struct regulator_bulk_data *consumers)
 391 {
 392 }
 393
 394 static inline int regulator_set_voltage(struct regulator *regulator,
 395                                         int min_uV, int max_uV)
 396 {
 397         return 0;
 398 }
 399
 400 static inline int regulator_get_voltage(struct regulator *regulator)
 401 {
 402         return -EINVAL;
 403 }
 404
 405 static inline int regulator_is_supported_voltage(struct regulator *regulator,
 406                                    int min_uV, int max_uV)
 407 {
 408         return 0;
 409 }
 410
 411 static inline int regulator_set_current_limit(struct regulator *regulator,
 412                                              int min_uA, int max_uA)
 413 {
 414         return 0;
 415 }
 416
 417 static inline int regulator_get_current_limit(struct regulator *regulator)
 418 {
 419         return 0;
 420 }
 421
 422 static inline int regulator_set_mode(struct regulator *regulator,
 423         unsigned int mode)
 424 {
 425         return 0;
 426 }
 427
 428 static inline unsigned int regulator_get_mode(struct regulator *regulator)
 429 {
 430         return REGULATOR_MODE_NORMAL;
 431 }
 432
 433 static inline int regulator_set_optimum_mode(struct regulator *regulator,
 434                                         int load_uA)
 435 {
 436         return REGULATOR_MODE_NORMAL;
 437 }
 438
 439 static inline int regulator_allow_bypass(struct regulator *regulator,
 440                                          bool allow)
 441 {
 442         return 0;
 443 }
 444
 445 static inline int regulator_register_notifier(struct regulator *regulator,
 446                               struct notifier_block *nb)
 447 {
 448         return 0;
 449 }
 450
 451 static inline int regulator_unregister_notifier(struct regulator *regulator,
 452                                 struct notifier_block *nb)
 453 {
 454         return 0;
 455 }
 456
 457 static inline void *regulator_get_drvdata(struct regulator *regulator)
 458 {
 459         return NULL;
 460 }
 461
 462 static inline void regulator_set_drvdata(struct regulator *regulator,
 463         void *data)
 464 {
 465 }
 466
 467 static inline int regulator_count_voltages(struct regulator *regulator)
 468 {
 469         return 0;
 470 }
 471 #endif
 472
 473 static inline int regulator_set_voltage_tol(struct regulator *regulator,
 474                                             int new_uV, int tol_uV)
 475 {
 476         if (regulator_set_voltage(regulator, new_uV, new_uV + tol_uV) == 0)
 477                 return 0;
 478         else
 479                 return regulator_set_voltage(regulator,
 480                                              new_uV - tol_uV, new_uV + tol_uV);
 481 }
 482
 483 static inline int regulator_is_supported_voltage_tol(struct regulator *regulator,
 484                                                      int target_uV, int tol_uV)
 485 {
 486         return regulator_is_supported_voltage(regulator,
 487                                               target_uV - tol_uV,
 488                                               target_uV + tol_uV);
 489 }
 490
 491 #endif