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 #include <linux/err.h>
  39
  40 struct device;
  41 struct notifier_block;
  42 struct regmap;
  43
  44 /*
  45  * Regulator operating modes.
  46  *
  47  * Regulators can run in a variety of different operating modes depending on
  48  * output load. This allows further system power savings by selecting the
  49  * best (and most efficient) regulator mode for a desired load.
  50  *
  51  * Most drivers will only care about NORMAL. The modes below are generic and
  52  * will probably not match the naming convention of your regulator data sheet
  53  * but should match the use cases in the datasheet.
  54  *
  55  * In order of power efficiency (least efficient at top).
  56  *
  57  *  Mode       Description
  58  *  FAST       Regulator can handle fast changes in it's load.
  59  *             e.g. useful in CPU voltage & frequency scaling where
  60  *             load can quickly increase with CPU frequency increases.
  61  *
  62  *  NORMAL     Normal regulator power supply mode. Most drivers will
  63  *             use this mode.
  64  *
  65  *  IDLE       Regulator runs in a more efficient mode for light
  66  *             loads. Can be used for devices that have a low power
  67  *             requirement during periods of inactivity. This mode
  68  *             may be more noisy than NORMAL and may not be able
  69  *             to handle fast load switching.
  70  *
  71  *  STANDBY    Regulator runs in the most efficient mode for very
  72  *             light loads. Can be used by devices when they are
  73  *             in a sleep/standby state. This mode is likely to be
  74  *             the most noisy and may not be able to handle fast load
  75  *             switching.
  76  *
  77  * NOTE: Most regulators will only support a subset of these modes. Some
  78  * will only just support NORMAL.
  79  *
  80  * These modes can be OR'ed together to make up a mask of valid register modes.
  81  */
  82
  83 #define REGULATOR_MODE_FAST                     0x1
  84 #define REGULATOR_MODE_NORMAL                   0x2
  85 #define REGULATOR_MODE_IDLE                     0x4
  86 #define REGULATOR_MODE_STANDBY                  0x8
  87
  88 /*
  89  * Regulator notifier events.
  90  *
  91  * UNDER_VOLTAGE  Regulator output is under voltage.
  92  * OVER_CURRENT   Regulator output current is too high.
  93  * REGULATION_OUT Regulator output is out of regulation.
  94  * FAIL           Regulator output has failed.
  95  * OVER_TEMP      Regulator over temp.
  96  * FORCE_DISABLE  Regulator forcibly shut down by software.
  97  * VOLTAGE_CHANGE Regulator voltage changed.
  98  *                Data passed is old voltage cast to (void *).
  99  * DISABLE        Regulator was disabled.
 100  * PRE_VOLTAGE_CHANGE   Regulator is about to have voltage changed.
 101  *                      Data passed is "struct pre_voltage_change_data"
 102  * ABORT_VOLTAGE_CHANGE Regulator voltage change failed for some reason.
 103  *                      Data passed is old voltage cast to (void *).
 104  * PRE_DISABLE    Regulator is about to be disabled
 105  * ABORT_DISABLE  Regulator disable failed for some reason
 106  *
 107  * NOTE: These events can be OR'ed together when passed into handler.
 108  */
 109
 110 #define REGULATOR_EVENT_UNDER_VOLTAGE           0x01
 111 #define REGULATOR_EVENT_OVER_CURRENT            0x02
 112 #define REGULATOR_EVENT_REGULATION_OUT          0x04
 113 #define REGULATOR_EVENT_FAIL                    0x08
 114 #define REGULATOR_EVENT_OVER_TEMP               0x10
 115 #define REGULATOR_EVENT_FORCE_DISABLE           0x20
 116 #define REGULATOR_EVENT_VOLTAGE_CHANGE          0x40
 117 #define REGULATOR_EVENT_DISABLE                 0x80
 118 #define REGULATOR_EVENT_PRE_VOLTAGE_CHANGE      0x100
 119 #define REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE    0x200
 120 #define REGULATOR_EVENT_PRE_DISABLE             0x400
 121 #define REGULATOR_EVENT_ABORT_DISABLE           0x800
 122
 123 /**
 124  * struct pre_voltage_change_data - Data sent with PRE_VOLTAGE_CHANGE event
 125  *
 126  * @old_uV: Current voltage before change.
 127  * @min_uV: Min voltage we'll change to.
 128  * @max_uV: Max voltage we'll change to.
 129  */
 130 struct pre_voltage_change_data {
 131         unsigned long old_uV;
 132         unsigned long min_uV;
 133         unsigned long max_uV;
 134 };
 135
 136 struct regulator;
 137
 138 /**
 139  * struct regulator_bulk_data - Data used for bulk regulator operations.
 140  *
 141  * @supply:   The name of the supply.  Initialised by the user before
 142  *            using the bulk regulator APIs.
 143  * @consumer: The regulator consumer for the supply.  This will be managed
 144  *            by the bulk API.
 145  *
 146  * The regulator APIs provide a series of regulator_bulk_() API calls as
 147  * a convenience to consumers which require multiple supplies.  This
 148  * structure is used to manage data for these calls.
 149  */
 150 struct regulator_bulk_data {
 151         const char *supply;
 152         struct regulator *consumer;
 153
 154         /* private: Internal use */
 155         int ret;
 156 };
 157
 158 #if defined(CONFIG_REGULATOR)
 159
 160 /* regulator get and put */
 161 struct regulator *__must_check regulator_get(struct device *dev,
 162                                              const char *id);
 163 struct regulator *__must_check devm_regulator_get(struct device *dev,
 164                                              const char *id);
 165 struct regulator *__must_check regulator_get_exclusive(struct device *dev,
 166                                                        const char *id);
 167 struct regulator *__must_check devm_regulator_get_exclusive(struct device *dev,
 168                                                         const char *id);
 169 struct regulator *__must_check regulator_get_optional(struct device *dev,
 170                                                       const char *id);
 171 struct regulator *__must_check devm_regulator_get_optional(struct device *dev,
 172                                                            const char *id);
 173 void regulator_put(struct regulator *regulator);
 174 void devm_regulator_put(struct regulator *regulator);
 175
 176 int regulator_register_supply_alias(struct device *dev, const char *id,
 177                                     struct device *alias_dev,
 178                                     const char *alias_id);
 179 void regulator_unregister_supply_alias(struct device *dev, const char *id);
 180
 181 int regulator_bulk_register_supply_alias(struct device *dev,
 182                                          const char *const *id,
 183                                          struct device *alias_dev,
 184                                          const char *const *alias_id,
 185                                          int num_id);
 186 void regulator_bulk_unregister_supply_alias(struct device *dev,
 187                                             const char * const *id, int num_id);
 188
 189 int devm_regulator_register_supply_alias(struct device *dev, const char *id,
 190                                          struct device *alias_dev,
 191                                          const char *alias_id);
 192 void devm_regulator_unregister_supply_alias(struct device *dev,
 193                                             const char *id);
 194
 195 int devm_regulator_bulk_register_supply_alias(struct device *dev,
 196                                               const char *const *id,
 197                                               struct device *alias_dev,
 198                                               const char *const *alias_id,
 199                                               int num_id);
 200 void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
 201                                                  const char *const *id,
 202                                                  int num_id);
 203
 204 /* regulator output control and status */
 205 int __must_check regulator_enable(struct regulator *regulator);
 206 int regulator_disable(struct regulator *regulator);
 207 int regulator_force_disable(struct regulator *regulator);
 208 int regulator_is_enabled(struct regulator *regulator);
 209 int regulator_disable_deferred(struct regulator *regulator, int ms);
 210
 211 int __must_check regulator_bulk_get(struct device *dev, int num_consumers,
 212                                     struct regulator_bulk_data *consumers);
 213 int __must_check devm_regulator_bulk_get(struct device *dev, int num_consumers,
 214                                          struct regulator_bulk_data *consumers);
 215 int __must_check regulator_bulk_enable(int num_consumers,
 216                                        struct regulator_bulk_data *consumers);
 217 int regulator_bulk_disable(int num_consumers,
 218                            struct regulator_bulk_data *consumers);
 219 int regulator_bulk_force_disable(int num_consumers,
 220                            struct regulator_bulk_data *consumers);
 221 void regulator_bulk_free(int num_consumers,
 222                          struct regulator_bulk_data *consumers);
 223
 224 int regulator_can_change_voltage(struct regulator *regulator);
 225 int regulator_count_voltages(struct regulator *regulator);
 226 int regulator_list_voltage(struct regulator *regulator, unsigned selector);
 227 int regulator_is_supported_voltage(struct regulator *regulator,
 228                                    int min_uV, int max_uV);
 229 unsigned int regulator_get_linear_step(struct regulator *regulator);
 230 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
 231 int regulator_set_voltage_time(struct regulator *regulator,
 232                                int old_uV, int new_uV);
 233 int regulator_get_voltage(struct regulator *regulator);
 234 int regulator_sync_voltage(struct regulator *regulator);
 235 int regulator_set_current_limit(struct regulator *regulator,
 236                                int min_uA, int max_uA);
 237 int regulator_get_current_limit(struct regulator *regulator);
 238
 239 int regulator_set_mode(struct regulator *regulator, unsigned int mode);
 240 unsigned int regulator_get_mode(struct regulator *regulator);
 241 int regulator_set_optimum_mode(struct regulator *regulator, int load_uA);
 242
 243 int regulator_allow_bypass(struct regulator *regulator, bool allow);
 244
 245 struct regmap *regulator_get_regmap(struct regulator *regulator);
 246 int regulator_get_hardware_vsel_register(struct regulator *regulator,
 247                                          unsigned *vsel_reg,
 248                                          unsigned *vsel_mask);
 249 int regulator_list_hardware_vsel(struct regulator *regulator,
 250                                  unsigned selector);
 251
 252 /* regulator notifier block */
 253 int regulator_register_notifier(struct regulator *regulator,
 254                               struct notifier_block *nb);
 255 int regulator_unregister_notifier(struct regulator *regulator,
 256                                 struct notifier_block *nb);
 257
 258 /* driver data - core doesn't touch */
 259 void *regulator_get_drvdata(struct regulator *regulator);
 260 void regulator_set_drvdata(struct regulator *regulator, void *data);
 261
 262 #else
 263
 264 /*
 265  * Make sure client drivers will still build on systems with no software
 266  * controllable voltage or current regulators.
 267  */
 268 static inline struct regulator *__must_check regulator_get(struct device *dev,
 269         const char *id)
 270 {
 271         /* Nothing except the stubbed out regulator API should be
 272          * looking at the value except to check if it is an error
 273          * value. Drivers are free to handle NULL specifically by
 274          * skipping all regulator API calls, but they don't have to.
 275          * Drivers which don't, should make sure they properly handle
 276          * corner cases of the API, such as regulator_get_voltage()
 277          * returning 0.
 278          */
 279         return NULL;
 280 }
 281
 282 static inline struct regulator *__must_check
 283 devm_regulator_get(struct device *dev, const char *id)
 284 {
 285         return NULL;
 286 }
 287
 288 static inline struct regulator *__must_check
 289 regulator_get_exclusive(struct device *dev, const char *id)
 290 {
 291         return ERR_PTR(-ENODEV);
 292 }
 293
 294 static inline struct regulator *__must_check
 295 regulator_get_optional(struct device *dev, const char *id)
 296 {
 297         return ERR_PTR(-ENODEV);
 298 }
 299
 300
 301 static inline struct regulator *__must_check
 302 devm_regulator_get_optional(struct device *dev, const char *id)
 303 {
 304         return ERR_PTR(-ENODEV);
 305 }
 306
 307 static inline void regulator_put(struct regulator *regulator)
 308 {
 309 }
 310
 311 static inline void devm_regulator_put(struct regulator *regulator)
 312 {
 313 }
 314
 315 static inline int regulator_register_supply_alias(struct device *dev,
 316                                                   const char *id,
 317                                                   struct device *alias_dev,
 318                                                   const char *alias_id)
 319 {
 320         return 0;
 321 }
 322
 323 static inline void regulator_unregister_supply_alias(struct device *dev,
 324                                                     const char *id)
 325 {
 326 }
 327
 328 static inline int regulator_bulk_register_supply_alias(struct device *dev,
 329                                                 const char *const *id,
 330                                                 struct device *alias_dev,
 331                                                 const char * const *alias_id,
 332                                                 int num_id)
 333 {
 334         return 0;
 335 }
 336
 337 static inline void regulator_bulk_unregister_supply_alias(struct device *dev,
 338                                                 const char * const *id,
 339                                                 int num_id)
 340 {
 341 }
 342
 343 static inline int devm_regulator_register_supply_alias(struct device *dev,
 344                                                        const char *id,
 345                                                        struct device *alias_dev,
 346                                                        const char *alias_id)
 347 {
 348         return 0;
 349 }
 350
 351 static inline void devm_regulator_unregister_supply_alias(struct device *dev,
 352                                                           const char *id)
 353 {
 354 }
 355
 356 static inline int devm_regulator_bulk_register_supply_alias(struct device *dev,
 357                                                 const char *const *id,
 358                                                 struct device *alias_dev,
 359                                                 const char *const *alias_id,
 360                                                 int num_id)
 361 {
 362         return 0;
 363 }
 364
 365 static inline void devm_regulator_bulk_unregister_supply_alias(
 366         struct device *dev, const char *const *id, int num_id)
 367 {
 368 }
 369
 370 static inline int regulator_enable(struct regulator *regulator)
 371 {
 372         return 0;
 373 }
 374
 375 static inline int regulator_disable(struct regulator *regulator)
 376 {
 377         return 0;
 378 }
 379
 380 static inline int regulator_force_disable(struct regulator *regulator)
 381 {
 382         return 0;
 383 }
 384
 385 static inline int regulator_disable_deferred(struct regulator *regulator,
 386                                              int ms)
 387 {
 388         return 0;
 389 }
 390
 391 static inline int regulator_is_enabled(struct regulator *regulator)
 392 {
 393         return 1;
 394 }
 395
 396 static inline int regulator_bulk_get(struct device *dev,
 397                                      int num_consumers,
 398                                      struct regulator_bulk_data *consumers)
 399 {
 400         return 0;
 401 }
 402
 403 static inline int devm_regulator_bulk_get(struct device *dev, int num_consumers,
 404                                           struct regulator_bulk_data *consumers)
 405 {
 406         return 0;
 407 }
 408
 409 static inline int regulator_bulk_enable(int num_consumers,
 410                                         struct regulator_bulk_data *consumers)
 411 {
 412         return 0;
 413 }
 414
 415 static inline int regulator_bulk_disable(int num_consumers,
 416                                          struct regulator_bulk_data *consumers)
 417 {
 418         return 0;
 419 }
 420
 421 static inline int regulator_bulk_force_disable(int num_consumers,
 422                                         struct regulator_bulk_data *consumers)
 423 {
 424         return 0;
 425 }
 426
 427 static inline void regulator_bulk_free(int num_consumers,
 428                                        struct regulator_bulk_data *consumers)
 429 {
 430 }
 431
 432 static inline int regulator_can_change_voltage(struct regulator *regulator)
 433 {
 434         return 0;
 435 }
 436
 437 static inline int regulator_set_voltage(struct regulator *regulator,
 438                                         int min_uV, int max_uV)
 439 {
 440         return 0;
 441 }
 442
 443 static inline int regulator_set_voltage_time(struct regulator *regulator,
 444                                              int old_uV, int new_uV)
 445 {
 446         return 0;
 447 }
 448
 449 static inline int regulator_get_voltage(struct regulator *regulator)
 450 {
 451         return -EINVAL;
 452 }
 453
 454 static inline int regulator_is_supported_voltage(struct regulator *regulator,
 455                                    int min_uV, int max_uV)
 456 {
 457         return 0;
 458 }
 459
 460 static inline int regulator_set_current_limit(struct regulator *regulator,
 461                                              int min_uA, int max_uA)
 462 {
 463         return 0;
 464 }
 465
 466 static inline int regulator_get_current_limit(struct regulator *regulator)
 467 {
 468         return 0;
 469 }
 470
 471 static inline int regulator_set_mode(struct regulator *regulator,
 472         unsigned int mode)
 473 {
 474         return 0;
 475 }
 476
 477 static inline unsigned int regulator_get_mode(struct regulator *regulator)
 478 {
 479         return REGULATOR_MODE_NORMAL;
 480 }
 481
 482 static inline int regulator_set_optimum_mode(struct regulator *regulator,
 483                                         int load_uA)
 484 {
 485         return REGULATOR_MODE_NORMAL;
 486 }
 487
 488 static inline int regulator_allow_bypass(struct regulator *regulator,
 489                                          bool allow)
 490 {
 491         return 0;
 492 }
 493
 494 static inline struct regmap *regulator_get_regmap(struct regulator *regulator)
 495 {
 496         return ERR_PTR(-EOPNOTSUPP);
 497 }
 498
 499 static inline int regulator_get_hardware_vsel_register(struct regulator *regulator,
 500                                                        unsigned *vsel_reg,
 501                                                        unsigned *vsel_mask)
 502 {
 503         return -EOPNOTSUPP;
 504 }
 505
 506 static inline int regulator_list_hardware_vsel(struct regulator *regulator,
 507                                                unsigned selector)
 508 {
 509         return -EOPNOTSUPP;
 510 }
 511
 512 static inline int regulator_register_notifier(struct regulator *regulator,
 513                               struct notifier_block *nb)
 514 {
 515         return 0;
 516 }
 517
 518 static inline int regulator_unregister_notifier(struct regulator *regulator,
 519                                 struct notifier_block *nb)
 520 {
 521         return 0;
 522 }
 523
 524 static inline void *regulator_get_drvdata(struct regulator *regulator)
 525 {
 526         return NULL;
 527 }
 528
 529 static inline void regulator_set_drvdata(struct regulator *regulator,
 530         void *data)
 531 {
 532 }
 533
 534 static inline int regulator_count_voltages(struct regulator *regulator)
 535 {
 536         return 0;
 537 }
 538 #endif
 539
 540 static inline int regulator_set_voltage_tol(struct regulator *regulator,
 541                                             int new_uV, int tol_uV)
 542 {
 543         if (regulator_set_voltage(regulator, new_uV, new_uV + tol_uV) == 0)
 544                 return 0;
 545         else
 546                 return regulator_set_voltage(regulator,
 547                                              new_uV - tol_uV, new_uV + tol_uV);
 548 }
 549
 550 static inline int regulator_is_supported_voltage_tol(struct regulator *regulator,
 551                                                      int target_uV, int tol_uV)
 552 {
 553         return regulator_is_supported_voltage(regulator,
 554                                               target_uV - tol_uV,
 555                                               target_uV + tol_uV);
 556 }
 557
 558 #endif