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_count_voltages(struct regulator *regulator);
 225 int regulator_list_voltage(struct regulator *regulator, unsigned selector);
 226 int regulator_is_supported_voltage(struct regulator *regulator,
 227                                    int min_uV, int max_uV);
 228 unsigned int regulator_get_linear_step(struct regulator *regulator);
 229 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
 230 int regulator_set_voltage_time(struct regulator *regulator,
 231                                int old_uV, int new_uV);
 232 int regulator_get_voltage(struct regulator *regulator);
 233 int regulator_sync_voltage(struct regulator *regulator);
 234 int regulator_set_current_limit(struct regulator *regulator,
 235                                int min_uA, int max_uA);
 236 int regulator_get_current_limit(struct regulator *regulator);
 237
 238 int regulator_set_mode(struct regulator *regulator, unsigned int mode);
 239 unsigned int regulator_get_mode(struct regulator *regulator);
 240 int regulator_set_load(struct regulator *regulator, int load_uA);
 241
 242 int regulator_allow_bypass(struct regulator *regulator, bool allow);
 243
 244 struct regmap *regulator_get_regmap(struct regulator *regulator);
 245 int regulator_get_hardware_vsel_register(struct regulator *regulator,
 246                                          unsigned *vsel_reg,
 247                                          unsigned *vsel_mask);
 248 int regulator_list_hardware_vsel(struct regulator *regulator,
 249                                  unsigned selector);
 250
 251 /* regulator notifier block */
 252 int regulator_register_notifier(struct regulator *regulator,
 253                               struct notifier_block *nb);
 254 int devm_regulator_register_notifier(struct regulator *regulator,
 255                                      struct notifier_block *nb);
 256 int regulator_unregister_notifier(struct regulator *regulator,
 257                                 struct notifier_block *nb);
 258 void devm_regulator_unregister_notifier(struct regulator *regulator,
 259                                         struct notifier_block *nb);
 260
 261 /* driver data - core doesn't touch */
 262 void *regulator_get_drvdata(struct regulator *regulator);
 263 void regulator_set_drvdata(struct regulator *regulator, void *data);
 264
 265 #else
 266
 267 /*
 268  * Make sure client drivers will still build on systems with no software
 269  * controllable voltage or current regulators.
 270  */
 271 static inline struct regulator *__must_check regulator_get(struct device *dev,
 272         const char *id)
 273 {
 274         /* Nothing except the stubbed out regulator API should be
 275          * looking at the value except to check if it is an error
 276          * value. Drivers are free to handle NULL specifically by
 277          * skipping all regulator API calls, but they don't have to.
 278          * Drivers which don't, should make sure they properly handle
 279          * corner cases of the API, such as regulator_get_voltage()
 280          * returning 0.
 281          */
 282         return NULL;
 283 }
 284
 285 static inline struct regulator *__must_check
 286 devm_regulator_get(struct device *dev, const char *id)
 287 {
 288         return NULL;
 289 }
 290
 291 static inline struct regulator *__must_check
 292 regulator_get_exclusive(struct device *dev, const char *id)
 293 {
 294         return ERR_PTR(-ENODEV);
 295 }
 296
 297 static inline struct regulator *__must_check
 298 regulator_get_optional(struct device *dev, const char *id)
 299 {
 300         return ERR_PTR(-ENODEV);
 301 }
 302
 303
 304 static inline struct regulator *__must_check
 305 devm_regulator_get_optional(struct device *dev, const char *id)
 306 {
 307         return ERR_PTR(-ENODEV);
 308 }
 309
 310 static inline void regulator_put(struct regulator *regulator)
 311 {
 312 }
 313
 314 static inline void devm_regulator_put(struct regulator *regulator)
 315 {
 316 }
 317
 318 static inline int regulator_register_supply_alias(struct device *dev,
 319                                                   const char *id,
 320                                                   struct device *alias_dev,
 321                                                   const char *alias_id)
 322 {
 323         return 0;
 324 }
 325
 326 static inline void regulator_unregister_supply_alias(struct device *dev,
 327                                                     const char *id)
 328 {
 329 }
 330
 331 static inline int regulator_bulk_register_supply_alias(struct device *dev,
 332                                                 const char *const *id,
 333                                                 struct device *alias_dev,
 334                                                 const char * const *alias_id,
 335                                                 int num_id)
 336 {
 337         return 0;
 338 }
 339
 340 static inline void regulator_bulk_unregister_supply_alias(struct device *dev,
 341                                                 const char * const *id,
 342                                                 int num_id)
 343 {
 344 }
 345
 346 static inline int devm_regulator_register_supply_alias(struct device *dev,
 347                                                        const char *id,
 348                                                        struct device *alias_dev,
 349                                                        const char *alias_id)
 350 {
 351         return 0;
 352 }
 353
 354 static inline void devm_regulator_unregister_supply_alias(struct device *dev,
 355                                                           const char *id)
 356 {
 357 }
 358
 359 static inline int devm_regulator_bulk_register_supply_alias(struct device *dev,
 360                                                 const char *const *id,
 361                                                 struct device *alias_dev,
 362                                                 const char *const *alias_id,
 363                                                 int num_id)
 364 {
 365         return 0;
 366 }
 367
 368 static inline void devm_regulator_bulk_unregister_supply_alias(
 369         struct device *dev, const char *const *id, int num_id)
 370 {
 371 }
 372
 373 static inline int regulator_enable(struct regulator *regulator)
 374 {
 375         return 0;
 376 }
 377
 378 static inline int regulator_disable(struct regulator *regulator)
 379 {
 380         return 0;
 381 }
 382
 383 static inline int regulator_force_disable(struct regulator *regulator)
 384 {
 385         return 0;
 386 }
 387
 388 static inline int regulator_disable_deferred(struct regulator *regulator,
 389                                              int ms)
 390 {
 391         return 0;
 392 }
 393
 394 static inline int regulator_is_enabled(struct regulator *regulator)
 395 {
 396         return 1;
 397 }
 398
 399 static inline int regulator_bulk_get(struct device *dev,
 400                                      int num_consumers,
 401                                      struct regulator_bulk_data *consumers)
 402 {
 403         return 0;
 404 }
 405
 406 static inline int devm_regulator_bulk_get(struct device *dev, int num_consumers,
 407                                           struct regulator_bulk_data *consumers)
 408 {
 409         return 0;
 410 }
 411
 412 static inline int regulator_bulk_enable(int num_consumers,
 413                                         struct regulator_bulk_data *consumers)
 414 {
 415         return 0;
 416 }
 417
 418 static inline int regulator_bulk_disable(int num_consumers,
 419                                          struct regulator_bulk_data *consumers)
 420 {
 421         return 0;
 422 }
 423
 424 static inline int regulator_bulk_force_disable(int num_consumers,
 425                                         struct regulator_bulk_data *consumers)
 426 {
 427         return 0;
 428 }
 429
 430 static inline void regulator_bulk_free(int num_consumers,
 431                                        struct regulator_bulk_data *consumers)
 432 {
 433 }
 434
 435 static inline int regulator_set_voltage(struct regulator *regulator,
 436                                         int min_uV, int max_uV)
 437 {
 438         return 0;
 439 }
 440
 441 static inline int regulator_set_voltage_time(struct regulator *regulator,
 442                                              int old_uV, int new_uV)
 443 {
 444         return 0;
 445 }
 446
 447 static inline int regulator_get_voltage(struct regulator *regulator)
 448 {
 449         return -EINVAL;
 450 }
 451
 452 static inline int regulator_is_supported_voltage(struct regulator *regulator,
 453                                    int min_uV, int max_uV)
 454 {
 455         return 0;
 456 }
 457
 458 static inline int regulator_set_current_limit(struct regulator *regulator,
 459                                              int min_uA, int max_uA)
 460 {
 461         return 0;
 462 }
 463
 464 static inline int regulator_get_current_limit(struct regulator *regulator)
 465 {
 466         return 0;
 467 }
 468
 469 static inline int regulator_set_mode(struct regulator *regulator,
 470         unsigned int mode)
 471 {
 472         return 0;
 473 }
 474
 475 static inline unsigned int regulator_get_mode(struct regulator *regulator)
 476 {
 477         return REGULATOR_MODE_NORMAL;
 478 }
 479
 480 static inline int regulator_set_load(struct regulator *regulator, int load_uA)
 481 {
 482         return REGULATOR_MODE_NORMAL;
 483 }
 484
 485 static inline int regulator_allow_bypass(struct regulator *regulator,
 486                                          bool allow)
 487 {
 488         return 0;
 489 }
 490
 491 static inline struct regmap *regulator_get_regmap(struct regulator *regulator)
 492 {
 493         return ERR_PTR(-EOPNOTSUPP);
 494 }
 495
 496 static inline int regulator_get_hardware_vsel_register(struct regulator *regulator,
 497                                                        unsigned *vsel_reg,
 498                                                        unsigned *vsel_mask)
 499 {
 500         return -EOPNOTSUPP;
 501 }
 502
 503 static inline int regulator_list_hardware_vsel(struct regulator *regulator,
 504                                                unsigned selector)
 505 {
 506         return -EOPNOTSUPP;
 507 }
 508
 509 static inline int regulator_register_notifier(struct regulator *regulator,
 510                               struct notifier_block *nb)
 511 {
 512         return 0;
 513 }
 514
 515 static inline int devm_regulator_register_notifier(struct regulator *regulator,
 516                                                    struct notifier_block *nb)
 517 {
 518         return 0;
 519 }
 520
 521 static inline int regulator_unregister_notifier(struct regulator *regulator,
 522                                 struct notifier_block *nb)
 523 {
 524         return 0;
 525 }
 526
 527 static inline int devm_regulator_unregister_notifier(struct regulator *regulator,
 528                                                      struct notifier_block *nb)
 529 {
 530         return 0;
 531 }
 532
 533 static inline void *regulator_get_drvdata(struct regulator *regulator)
 534 {
 535         return NULL;
 536 }
 537
 538 static inline void regulator_set_drvdata(struct regulator *regulator,
 539         void *data)
 540 {
 541 }
 542
 543 static inline int regulator_count_voltages(struct regulator *regulator)
 544 {
 545         return 0;
 546 }
 547
 548 static inline int regulator_list_voltage(struct regulator *regulator, unsigned selector)
 549 {
 550         return -EINVAL;
 551 }
 552
 553 #endif
 554
 555 static inline int regulator_set_voltage_triplet(struct regulator *regulator,
 556                                                 int min_uV, int target_uV,
 557                                                 int max_uV)
 558 {
 559         if (regulator_set_voltage(regulator, target_uV, max_uV) == 0)
 560                 return 0;
 561
 562         return regulator_set_voltage(regulator, min_uV, max_uV);
 563 }
 564
 565 static inline int regulator_set_voltage_tol(struct regulator *regulator,
 566                                             int new_uV, int tol_uV)
 567 {
 568         if (regulator_set_voltage(regulator, new_uV, new_uV + tol_uV) == 0)
 569                 return 0;
 570         else
 571                 return regulator_set_voltage(regulator,
 572                                              new_uV - tol_uV, new_uV + tol_uV);
 573 }
 574
 575 static inline int regulator_is_supported_voltage_tol(struct regulator *regulator,
 576                                                      int target_uV, int tol_uV)
 577 {
 578         return regulator_is_supported_voltage(regulator,
 579                                               target_uV - tol_uV,
 580                                               target_uV + tol_uV);
 581 }
 582
 583 #endif