include/linux/regulator/consumer.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * consumer.h -- SoC Regulator consumer support.
   4  *
   5  * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
   6  *
   7  * Author: Liam Girdwood <lrg@slimlogic.co.uk>
   8  *
   9  * Regulator Consumer Interface.
  10  *
  11  * A Power Management Regulator framework for SoC based devices.
  12  * Features:-
  13  *   o Voltage and current level control.
  14  *   o Operating mode control.
  15  *   o Regulator status.
  16  *   o sysfs entries for showing client devices and status
  17  *
  18  * EXPERIMENTAL FEATURES:
  19  *   Dynamic Regulator operating Mode Switching (DRMS) - allows regulators
  20  *   to use most efficient operating mode depending upon voltage and load and
  21  *   is transparent to client drivers.
  22  *
  23  *   e.g. Devices x,y,z share regulator r. Device x and y draw 20mA each during
  24  *   IO and 1mA at idle. Device z draws 100mA when under load and 5mA when
  25  *   idling. Regulator r has > 90% efficiency in NORMAL mode at loads > 100mA
  26  *   but this drops rapidly to 60% when below 100mA. Regulator r has > 90%
  27  *   efficiency in IDLE mode at loads < 10mA. Thus regulator r will operate
  28  *   in normal mode for loads > 10mA and in IDLE mode for load <= 10mA.
  29  */
  30
  31 #ifndef __LINUX_REGULATOR_CONSUMER_H_
  32 #define __LINUX_REGULATOR_CONSUMER_H_
  33
  34 #include <linux/err.h>
  35
  36 struct device;
  37 struct notifier_block;
  38 struct regmap;
  39
  40 /*
  41  * Regulator operating modes.
  42  *
  43  * Regulators can run in a variety of different operating modes depending on
  44  * output load. This allows further system power savings by selecting the
  45  * best (and most efficient) regulator mode for a desired load.
  46  *
  47  * Most drivers will only care about NORMAL. The modes below are generic and
  48  * will probably not match the naming convention of your regulator data sheet
  49  * but should match the use cases in the datasheet.
  50  *
  51  * In order of power efficiency (least efficient at top).
  52  *
  53  *  Mode       Description
  54  *  FAST       Regulator can handle fast changes in it's load.
  55  *             e.g. useful in CPU voltage & frequency scaling where
  56  *             load can quickly increase with CPU frequency increases.
  57  *
  58  *  NORMAL     Normal regulator power supply mode. Most drivers will
  59  *             use this mode.
  60  *
  61  *  IDLE       Regulator runs in a more efficient mode for light
  62  *             loads. Can be used for devices that have a low power
  63  *             requirement during periods of inactivity. This mode
  64  *             may be more noisy than NORMAL and may not be able
  65  *             to handle fast load switching.
  66  *
  67  *  STANDBY    Regulator runs in the most efficient mode for very
  68  *             light loads. Can be used by devices when they are
  69  *             in a sleep/standby state. This mode is likely to be
  70  *             the most noisy and may not be able to handle fast load
  71  *             switching.
  72  *
  73  * NOTE: Most regulators will only support a subset of these modes. Some
  74  * will only just support NORMAL.
  75  *
  76  * These modes can be OR'ed together to make up a mask of valid register modes.
  77  */
  78
  79 #define REGULATOR_MODE_INVALID                  0x0
  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  *                Data passed is old voltage cast to (void *).
  96  * DISABLE        Regulator was disabled.
  97  * PRE_VOLTAGE_CHANGE   Regulator is about to have voltage changed.
  98  *                      Data passed is "struct pre_voltage_change_data"
  99  * ABORT_VOLTAGE_CHANGE Regulator voltage change failed for some reason.
 100  *                      Data passed is old voltage cast to (void *).
 101  * PRE_DISABLE    Regulator is about to be disabled
 102  * ABORT_DISABLE  Regulator disable failed for some reason
 103  *
 104  * NOTE: These events can be OR'ed together when passed into handler.
 105  */
 106
 107 #define REGULATOR_EVENT_UNDER_VOLTAGE           0x01
 108 #define REGULATOR_EVENT_OVER_CURRENT            0x02
 109 #define REGULATOR_EVENT_REGULATION_OUT          0x04
 110 #define REGULATOR_EVENT_FAIL                    0x08
 111 #define REGULATOR_EVENT_OVER_TEMP               0x10
 112 #define REGULATOR_EVENT_FORCE_DISABLE           0x20
 113 #define REGULATOR_EVENT_VOLTAGE_CHANGE          0x40
 114 #define REGULATOR_EVENT_DISABLE                 0x80
 115 #define REGULATOR_EVENT_PRE_VOLTAGE_CHANGE      0x100
 116 #define REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE    0x200
 117 #define REGULATOR_EVENT_PRE_DISABLE             0x400
 118 #define REGULATOR_EVENT_ABORT_DISABLE           0x800
 119 #define REGULATOR_EVENT_ENABLE                  0x1000
 120
 121 /*
 122  * Regulator errors that can be queried using regulator_get_error_flags
 123  *
 124  * UNDER_VOLTAGE  Regulator output is under voltage.
 125  * OVER_CURRENT   Regulator output current is too high.
 126  * REGULATION_OUT Regulator output is out of regulation.
 127  * FAIL           Regulator output has failed.
 128  * OVER_TEMP      Regulator over temp.
 129  *
 130  * NOTE: These errors can be OR'ed together.
 131  */
 132
 133 #define REGULATOR_ERROR_UNDER_VOLTAGE           BIT(1)
 134 #define REGULATOR_ERROR_OVER_CURRENT            BIT(2)
 135 #define REGULATOR_ERROR_REGULATION_OUT          BIT(3)
 136 #define REGULATOR_ERROR_FAIL                    BIT(4)
 137 #define REGULATOR_ERROR_OVER_TEMP               BIT(5)
 138
 139
 140 /**
 141  * struct pre_voltage_change_data - Data sent with PRE_VOLTAGE_CHANGE event
 142  *
 143  * @old_uV: Current voltage before change.
 144  * @min_uV: Min voltage we'll change to.
 145  * @max_uV: Max voltage we'll change to.
 146  */
 147 struct pre_voltage_change_data {
 148         unsigned long old_uV;
 149         unsigned long min_uV;
 150         unsigned long max_uV;
 151 };
 152
 153 struct regulator;
 154
 155 /**
 156  * struct regulator_bulk_data - Data used for bulk regulator operations.
 157  *
 158  * @supply:   The name of the supply.  Initialised by the user before
 159  *            using the bulk regulator APIs.
 160  * @consumer: The regulator consumer for the supply.  This will be managed
 161  *            by the bulk API.
 162  *
 163  * The regulator APIs provide a series of regulator_bulk_() API calls as
 164  * a convenience to consumers which require multiple supplies.  This
 165  * structure is used to manage data for these calls.
 166  */
 167 struct regulator_bulk_data {
 168         const char *supply;
 169         struct regulator *consumer;
 170
 171         /* private: Internal use */
 172         int ret;
 173 };
 174
 175 #if defined(CONFIG_REGULATOR)
 176
 177 /* regulator get and put */
 178 struct regulator *__must_check regulator_get(struct device *dev,
 179                                              const char *id);
 180 struct regulator *__must_check devm_regulator_get(struct device *dev,
 181                                              const char *id);
 182 struct regulator *__must_check regulator_get_exclusive(struct device *dev,
 183                                                        const char *id);
 184 struct regulator *__must_check devm_regulator_get_exclusive(struct device *dev,
 185                                                         const char *id);
 186 struct regulator *__must_check regulator_get_optional(struct device *dev,
 187                                                       const char *id);
 188 struct regulator *__must_check devm_regulator_get_optional(struct device *dev,
 189                                                            const char *id);
 190 void regulator_put(struct regulator *regulator);
 191 void devm_regulator_put(struct regulator *regulator);
 192
 193 int regulator_register_supply_alias(struct device *dev, const char *id,
 194                                     struct device *alias_dev,
 195                                     const char *alias_id);
 196 void regulator_unregister_supply_alias(struct device *dev, const char *id);
 197
 198 int regulator_bulk_register_supply_alias(struct device *dev,
 199                                          const char *const *id,
 200                                          struct device *alias_dev,
 201                                          const char *const *alias_id,
 202                                          int num_id);
 203 void regulator_bulk_unregister_supply_alias(struct device *dev,
 204                                             const char * const *id, int num_id);
 205
 206 int devm_regulator_register_supply_alias(struct device *dev, const char *id,
 207                                          struct device *alias_dev,
 208                                          const char *alias_id);
 209 void devm_regulator_unregister_supply_alias(struct device *dev,
 210                                             const char *id);
 211
 212 int devm_regulator_bulk_register_supply_alias(struct device *dev,
 213                                               const char *const *id,
 214                                               struct device *alias_dev,
 215                                               const char *const *alias_id,
 216                                               int num_id);
 217 void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
 218                                                  const char *const *id,
 219                                                  int num_id);
 220
 221 /* regulator output control and status */
 222 int __must_check regulator_enable(struct regulator *regulator);
 223 int regulator_disable(struct regulator *regulator);
 224 int regulator_force_disable(struct regulator *regulator);
 225 int regulator_is_enabled(struct regulator *regulator);
 226 int regulator_disable_deferred(struct regulator *regulator, int ms);
 227
 228 int __must_check regulator_bulk_get(struct device *dev, int num_consumers,
 229                                     struct regulator_bulk_data *consumers);
 230 int __must_check devm_regulator_bulk_get(struct device *dev, int num_consumers,
 231                                          struct regulator_bulk_data *consumers);
 232 int __must_check regulator_bulk_enable(int num_consumers,
 233                                        struct regulator_bulk_data *consumers);
 234 int regulator_bulk_disable(int num_consumers,
 235                            struct regulator_bulk_data *consumers);
 236 int regulator_bulk_force_disable(int num_consumers,
 237                            struct regulator_bulk_data *consumers);
 238 void regulator_bulk_free(int num_consumers,
 239                          struct regulator_bulk_data *consumers);
 240
 241 int regulator_count_voltages(struct regulator *regulator);
 242 int regulator_list_voltage(struct regulator *regulator, unsigned selector);
 243 int regulator_is_supported_voltage(struct regulator *regulator,
 244                                    int min_uV, int max_uV);
 245 unsigned int regulator_get_linear_step(struct regulator *regulator);
 246 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
 247 int regulator_set_voltage_time(struct regulator *regulator,
 248                                int old_uV, int new_uV);
 249 int regulator_get_voltage(struct regulator *regulator);
 250 int regulator_sync_voltage(struct regulator *regulator);
 251 int regulator_set_current_limit(struct regulator *regulator,
 252                                int min_uA, int max_uA);
 253 int regulator_get_current_limit(struct regulator *regulator);
 254
 255 int regulator_set_mode(struct regulator *regulator, unsigned int mode);
 256 unsigned int regulator_get_mode(struct regulator *regulator);
 257 int regulator_get_error_flags(struct regulator *regulator,
 258                                 unsigned int *flags);
 259 int regulator_set_load(struct regulator *regulator, int load_uA);
 260
 261 int regulator_allow_bypass(struct regulator *regulator, bool allow);
 262
 263 struct regmap *regulator_get_regmap(struct regulator *regulator);
 264 int regulator_get_hardware_vsel_register(struct regulator *regulator,
 265                                          unsigned *vsel_reg,
 266                                          unsigned *vsel_mask);
 267 int regulator_list_hardware_vsel(struct regulator *regulator,
 268                                  unsigned selector);
 269
 270 /* regulator notifier block */
 271 int regulator_register_notifier(struct regulator *regulator,
 272                               struct notifier_block *nb);
 273 int devm_regulator_register_notifier(struct regulator *regulator,
 274                                      struct notifier_block *nb);
 275 int regulator_unregister_notifier(struct regulator *regulator,
 276                                 struct notifier_block *nb);
 277 void devm_regulator_unregister_notifier(struct regulator *regulator,
 278                                         struct notifier_block *nb);
 279
 280 /* driver data - core doesn't touch */
 281 void *regulator_get_drvdata(struct regulator *regulator);
 282 void regulator_set_drvdata(struct regulator *regulator, void *data);
 283
 284 #else
 285
 286 /*
 287  * Make sure client drivers will still build on systems with no software
 288  * controllable voltage or current regulators.
 289  */
 290 static inline struct regulator *__must_check regulator_get(struct device *dev,
 291         const char *id)
 292 {
 293         /* Nothing except the stubbed out regulator API should be
 294          * looking at the value except to check if it is an error
 295          * value. Drivers are free to handle NULL specifically by
 296          * skipping all regulator API calls, but they don't have to.
 297          * Drivers which don't, should make sure they properly handle
 298          * corner cases of the API, such as regulator_get_voltage()
 299          * returning 0.
 300          */
 301         return NULL;
 302 }
 303
 304 static inline struct regulator *__must_check
 305 devm_regulator_get(struct device *dev, const char *id)
 306 {
 307         return NULL;
 308 }
 309
 310 static inline struct regulator *__must_check
 311 regulator_get_exclusive(struct device *dev, const char *id)
 312 {
 313         return ERR_PTR(-ENODEV);
 314 }
 315
 316 static inline struct regulator *__must_check
 317 regulator_get_optional(struct device *dev, const char *id)
 318 {
 319         return ERR_PTR(-ENODEV);
 320 }
 321
 322
 323 static inline struct regulator *__must_check
 324 devm_regulator_get_optional(struct device *dev, const char *id)
 325 {
 326         return ERR_PTR(-ENODEV);
 327 }
 328
 329 static inline void regulator_put(struct regulator *regulator)
 330 {
 331 }
 332
 333 static inline void devm_regulator_put(struct regulator *regulator)
 334 {
 335 }
 336
 337 static inline int regulator_register_supply_alias(struct device *dev,
 338                                                   const char *id,
 339                                                   struct device *alias_dev,
 340                                                   const char *alias_id)
 341 {
 342         return 0;
 343 }
 344
 345 static inline void regulator_unregister_supply_alias(struct device *dev,
 346                                                     const char *id)
 347 {
 348 }
 349
 350 static inline int regulator_bulk_register_supply_alias(struct device *dev,
 351                                                 const char *const *id,
 352                                                 struct device *alias_dev,
 353                                                 const char * const *alias_id,
 354                                                 int num_id)
 355 {
 356         return 0;
 357 }
 358
 359 static inline void regulator_bulk_unregister_supply_alias(struct device *dev,
 360                                                 const char * const *id,
 361                                                 int num_id)
 362 {
 363 }
 364
 365 static inline int devm_regulator_register_supply_alias(struct device *dev,
 366                                                        const char *id,
 367                                                        struct device *alias_dev,
 368                                                        const char *alias_id)
 369 {
 370         return 0;
 371 }
 372
 373 static inline void devm_regulator_unregister_supply_alias(struct device *dev,
 374                                                           const char *id)
 375 {
 376 }
 377
 378 static inline int devm_regulator_bulk_register_supply_alias(struct device *dev,
 379                                                 const char *const *id,
 380                                                 struct device *alias_dev,
 381                                                 const char *const *alias_id,
 382                                                 int num_id)
 383 {
 384         return 0;
 385 }
 386
 387 static inline void devm_regulator_bulk_unregister_supply_alias(
 388         struct device *dev, const char *const *id, int num_id)
 389 {
 390 }
 391
 392 static inline int regulator_enable(struct regulator *regulator)
 393 {
 394         return 0;
 395 }
 396
 397 static inline int regulator_disable(struct regulator *regulator)
 398 {
 399         return 0;
 400 }
 401
 402 static inline int regulator_force_disable(struct regulator *regulator)
 403 {
 404         return 0;
 405 }
 406
 407 static inline int regulator_disable_deferred(struct regulator *regulator,
 408                                              int ms)
 409 {
 410         return 0;
 411 }
 412
 413 static inline int regulator_is_enabled(struct regulator *regulator)
 414 {
 415         return 1;
 416 }
 417
 418 static inline int regulator_bulk_get(struct device *dev,
 419                                      int num_consumers,
 420                                      struct regulator_bulk_data *consumers)
 421 {
 422         return 0;
 423 }
 424
 425 static inline int devm_regulator_bulk_get(struct device *dev, int num_consumers,
 426                                           struct regulator_bulk_data *consumers)
 427 {
 428         return 0;
 429 }
 430
 431 static inline int regulator_bulk_enable(int num_consumers,
 432                                         struct regulator_bulk_data *consumers)
 433 {
 434         return 0;
 435 }
 436
 437 static inline int regulator_bulk_disable(int num_consumers,
 438                                          struct regulator_bulk_data *consumers)
 439 {
 440         return 0;
 441 }
 442
 443 static inline int regulator_bulk_force_disable(int num_consumers,
 444                                         struct regulator_bulk_data *consumers)
 445 {
 446         return 0;
 447 }
 448
 449 static inline void regulator_bulk_free(int num_consumers,
 450                                        struct regulator_bulk_data *consumers)
 451 {
 452 }
 453
 454 static inline int regulator_set_voltage(struct regulator *regulator,
 455                                         int min_uV, int max_uV)
 456 {
 457         return 0;
 458 }
 459
 460 static inline int regulator_set_voltage_time(struct regulator *regulator,
 461                                              int old_uV, int new_uV)
 462 {
 463         return 0;
 464 }
 465
 466 static inline int regulator_get_voltage(struct regulator *regulator)
 467 {
 468         return -EINVAL;
 469 }
 470
 471 static inline int regulator_is_supported_voltage(struct regulator *regulator,
 472                                    int min_uV, int max_uV)
 473 {
 474         return 0;
 475 }
 476
 477 static inline unsigned int regulator_get_linear_step(struct regulator *regulator)
 478 {
 479         return 0;
 480 }
 481
 482 static inline int regulator_set_current_limit(struct regulator *regulator,
 483                                              int min_uA, int max_uA)
 484 {
 485         return 0;
 486 }
 487
 488 static inline int regulator_get_current_limit(struct regulator *regulator)
 489 {
 490         return 0;
 491 }
 492
 493 static inline int regulator_set_mode(struct regulator *regulator,
 494         unsigned int mode)
 495 {
 496         return 0;
 497 }
 498
 499 static inline unsigned int regulator_get_mode(struct regulator *regulator)
 500 {
 501         return REGULATOR_MODE_NORMAL;
 502 }
 503
 504 static inline int regulator_get_error_flags(struct regulator *regulator,
 505                                             unsigned int *flags)
 506 {
 507         return -EINVAL;
 508 }
 509
 510 static inline int regulator_set_load(struct regulator *regulator, int load_uA)
 511 {
 512         return 0;
 513 }
 514
 515 static inline int regulator_allow_bypass(struct regulator *regulator,
 516                                          bool allow)
 517 {
 518         return 0;
 519 }
 520
 521 static inline struct regmap *regulator_get_regmap(struct regulator *regulator)
 522 {
 523         return ERR_PTR(-EOPNOTSUPP);
 524 }
 525
 526 static inline int regulator_get_hardware_vsel_register(struct regulator *regulator,
 527                                                        unsigned *vsel_reg,
 528                                                        unsigned *vsel_mask)
 529 {
 530         return -EOPNOTSUPP;
 531 }
 532
 533 static inline int regulator_list_hardware_vsel(struct regulator *regulator,
 534                                                unsigned selector)
 535 {
 536         return -EOPNOTSUPP;
 537 }
 538
 539 static inline int regulator_register_notifier(struct regulator *regulator,
 540                               struct notifier_block *nb)
 541 {
 542         return 0;
 543 }
 544
 545 static inline int devm_regulator_register_notifier(struct regulator *regulator,
 546                                                    struct notifier_block *nb)
 547 {
 548         return 0;
 549 }
 550
 551 static inline int regulator_unregister_notifier(struct regulator *regulator,
 552                                 struct notifier_block *nb)
 553 {
 554         return 0;
 555 }
 556
 557 static inline int devm_regulator_unregister_notifier(struct regulator *regulator,
 558                                                      struct notifier_block *nb)
 559 {
 560         return 0;
 561 }
 562
 563 static inline void *regulator_get_drvdata(struct regulator *regulator)
 564 {
 565         return NULL;
 566 }
 567
 568 static inline void regulator_set_drvdata(struct regulator *regulator,
 569         void *data)
 570 {
 571 }
 572
 573 static inline int regulator_count_voltages(struct regulator *regulator)
 574 {
 575         return 0;
 576 }
 577
 578 static inline int regulator_list_voltage(struct regulator *regulator, unsigned selector)
 579 {
 580         return -EINVAL;
 581 }
 582
 583 #endif
 584
 585 static inline int regulator_set_voltage_triplet(struct regulator *regulator,
 586                                                 int min_uV, int target_uV,
 587                                                 int max_uV)
 588 {
 589         if (regulator_set_voltage(regulator, target_uV, max_uV) == 0)
 590                 return 0;
 591
 592         return regulator_set_voltage(regulator, min_uV, max_uV);
 593 }
 594
 595 static inline int regulator_set_voltage_tol(struct regulator *regulator,
 596                                             int new_uV, int tol_uV)
 597 {
 598         if (regulator_set_voltage(regulator, new_uV, new_uV + tol_uV) == 0)
 599                 return 0;
 600         else
 601                 return regulator_set_voltage(regulator,
 602                                              new_uV - tol_uV, new_uV + tol_uV);
 603 }
 604
 605 static inline int regulator_is_supported_voltage_tol(struct regulator *regulator,
 606                                                      int target_uV, int tol_uV)
 607 {
 608         return regulator_is_supported_voltage(regulator,
 609                                               target_uV - tol_uV,
 610                                               target_uV + tol_uV);
 611 }
 612
 613 #endif