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Linux/include/linux/regulator/consumer.h

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  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 #include <linux/suspend.h>
 36 
 37 struct device;
 38 struct notifier_block;
 39 struct regmap;
 40 struct regulator_dev;
 41 
 42 /*
 43  * Regulator operating modes.
 44  *
 45  * Regulators can run in a variety of different operating modes depending on
 46  * output load. This allows further system power savings by selecting the
 47  * best (and most efficient) regulator mode for a desired load.
 48  *
 49  * Most drivers will only care about NORMAL. The modes below are generic and
 50  * will probably not match the naming convention of your regulator data sheet
 51  * but should match the use cases in the datasheet.
 52  *
 53  * In order of power efficiency (least efficient at top).
 54  *
 55  *  Mode       Description
 56  *  FAST       Regulator can handle fast changes in it's load.
 57  *             e.g. useful in CPU voltage & frequency scaling where
 58  *             load can quickly increase with CPU frequency increases.
 59  *
 60  *  NORMAL     Normal regulator power supply mode. Most drivers will
 61  *             use this mode.
 62  *
 63  *  IDLE       Regulator runs in a more efficient mode for light
 64  *             loads. Can be used for devices that have a low power
 65  *             requirement during periods of inactivity. This mode
 66  *             may be more noisy than NORMAL and may not be able
 67  *             to handle fast load switching.
 68  *
 69  *  STANDBY    Regulator runs in the most efficient mode for very
 70  *             light loads. Can be used by devices when they are
 71  *             in a sleep/standby state. This mode is likely to be
 72  *             the most noisy and may not be able to handle fast load
 73  *             switching.
 74  *
 75  * NOTE: Most regulators will only support a subset of these modes. Some
 76  * will only just support NORMAL.
 77  *
 78  * These modes can be OR'ed together to make up a mask of valid register modes.
 79  */
 80 
 81 #define REGULATOR_MODE_INVALID                  0x0
 82 #define REGULATOR_MODE_FAST                     0x1
 83 #define REGULATOR_MODE_NORMAL                   0x2
 84 #define REGULATOR_MODE_IDLE                     0x4
 85 #define REGULATOR_MODE_STANDBY                  0x8
 86 
 87 /*
 88  * Regulator notifier events.
 89  *
 90  * UNDER_VOLTAGE  Regulator output is under voltage.
 91  * OVER_CURRENT   Regulator output current is too high.
 92  * REGULATION_OUT Regulator output is out of regulation.
 93  * FAIL           Regulator output has failed.
 94  * OVER_TEMP      Regulator over temp.
 95  * FORCE_DISABLE  Regulator forcibly shut down by software.
 96  * VOLTAGE_CHANGE Regulator voltage changed.
 97  *                Data passed is old voltage cast to (void *).
 98  * DISABLE        Regulator was disabled.
 99  * PRE_VOLTAGE_CHANGE   Regulator is about to have voltage changed.
100  *                      Data passed is "struct pre_voltage_change_data"
101  * ABORT_VOLTAGE_CHANGE Regulator voltage change failed for some reason.
102  *                      Data passed is old voltage cast to (void *).
103  * PRE_DISABLE    Regulator is about to be disabled
104  * ABORT_DISABLE  Regulator disable failed for some reason
105  *
106  * NOTE: These events can be OR'ed together when passed into handler.
107  */
108 
109 #define REGULATOR_EVENT_UNDER_VOLTAGE           0x01
110 #define REGULATOR_EVENT_OVER_CURRENT            0x02
111 #define REGULATOR_EVENT_REGULATION_OUT          0x04
112 #define REGULATOR_EVENT_FAIL                    0x08
113 #define REGULATOR_EVENT_OVER_TEMP               0x10
114 #define REGULATOR_EVENT_FORCE_DISABLE           0x20
115 #define REGULATOR_EVENT_VOLTAGE_CHANGE          0x40
116 #define REGULATOR_EVENT_DISABLE                 0x80
117 #define REGULATOR_EVENT_PRE_VOLTAGE_CHANGE      0x100
118 #define REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE    0x200
119 #define REGULATOR_EVENT_PRE_DISABLE             0x400
120 #define REGULATOR_EVENT_ABORT_DISABLE           0x800
121 #define REGULATOR_EVENT_ENABLE                  0x1000
122 
123 /*
124  * Regulator errors that can be queried using regulator_get_error_flags
125  *
126  * UNDER_VOLTAGE  Regulator output is under voltage.
127  * OVER_CURRENT   Regulator output current is too high.
128  * REGULATION_OUT Regulator output is out of regulation.
129  * FAIL           Regulator output has failed.
130  * OVER_TEMP      Regulator over temp.
131  *
132  * NOTE: These errors can be OR'ed together.
133  */
134 
135 #define REGULATOR_ERROR_UNDER_VOLTAGE           BIT(1)
136 #define REGULATOR_ERROR_OVER_CURRENT            BIT(2)
137 #define REGULATOR_ERROR_REGULATION_OUT          BIT(3)
138 #define REGULATOR_ERROR_FAIL                    BIT(4)
139 #define REGULATOR_ERROR_OVER_TEMP               BIT(5)
140 
141 
142 /**
143  * struct pre_voltage_change_data - Data sent with PRE_VOLTAGE_CHANGE event
144  *
145  * @old_uV: Current voltage before change.
146  * @min_uV: Min voltage we'll change to.
147  * @max_uV: Max voltage we'll change to.
148  */
149 struct pre_voltage_change_data {
150         unsigned long old_uV;
151         unsigned long min_uV;
152         unsigned long max_uV;
153 };
154 
155 struct regulator;
156 
157 /**
158  * struct regulator_bulk_data - Data used for bulk regulator operations.
159  *
160  * @supply:   The name of the supply.  Initialised by the user before
161  *            using the bulk regulator APIs.
162  * @consumer: The regulator consumer for the supply.  This will be managed
163  *            by the bulk API.
164  *
165  * The regulator APIs provide a series of regulator_bulk_() API calls as
166  * a convenience to consumers which require multiple supplies.  This
167  * structure is used to manage data for these calls.
168  */
169 struct regulator_bulk_data {
170         const char *supply;
171         struct regulator *consumer;
172 
173         /* private: Internal use */
174         int ret;
175 };
176 
177 #if defined(CONFIG_REGULATOR)
178 
179 /* regulator get and put */
180 struct regulator *__must_check regulator_get(struct device *dev,
181                                              const char *id);
182 struct regulator *__must_check devm_regulator_get(struct device *dev,
183                                              const char *id);
184 struct regulator *__must_check regulator_get_exclusive(struct device *dev,
185                                                        const char *id);
186 struct regulator *__must_check devm_regulator_get_exclusive(struct device *dev,
187                                                         const char *id);
188 struct regulator *__must_check regulator_get_optional(struct device *dev,
189                                                       const char *id);
190 struct regulator *__must_check devm_regulator_get_optional(struct device *dev,
191                                                            const char *id);
192 void regulator_put(struct regulator *regulator);
193 void devm_regulator_put(struct regulator *regulator);
194 
195 int regulator_register_supply_alias(struct device *dev, const char *id,
196                                     struct device *alias_dev,
197                                     const char *alias_id);
198 void regulator_unregister_supply_alias(struct device *dev, const char *id);
199 
200 int regulator_bulk_register_supply_alias(struct device *dev,
201                                          const char *const *id,
202                                          struct device *alias_dev,
203                                          const char *const *alias_id,
204                                          int num_id);
205 void regulator_bulk_unregister_supply_alias(struct device *dev,
206                                             const char * const *id, int num_id);
207 
208 int devm_regulator_register_supply_alias(struct device *dev, const char *id,
209                                          struct device *alias_dev,
210                                          const char *alias_id);
211 void devm_regulator_unregister_supply_alias(struct device *dev,
212                                             const char *id);
213 
214 int devm_regulator_bulk_register_supply_alias(struct device *dev,
215                                               const char *const *id,
216                                               struct device *alias_dev,
217                                               const char *const *alias_id,
218                                               int num_id);
219 void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
220                                                  const char *const *id,
221                                                  int num_id);
222 
223 /* regulator output control and status */
224 int __must_check regulator_enable(struct regulator *regulator);
225 int regulator_disable(struct regulator *regulator);
226 int regulator_force_disable(struct regulator *regulator);
227 int regulator_is_enabled(struct regulator *regulator);
228 int regulator_disable_deferred(struct regulator *regulator, int ms);
229 
230 int __must_check regulator_bulk_get(struct device *dev, int num_consumers,
231                                     struct regulator_bulk_data *consumers);
232 int __must_check devm_regulator_bulk_get(struct device *dev, int num_consumers,
233                                          struct regulator_bulk_data *consumers);
234 int __must_check regulator_bulk_enable(int num_consumers,
235                                        struct regulator_bulk_data *consumers);
236 int regulator_bulk_disable(int num_consumers,
237                            struct regulator_bulk_data *consumers);
238 int regulator_bulk_force_disable(int num_consumers,
239                            struct regulator_bulk_data *consumers);
240 void regulator_bulk_free(int num_consumers,
241                          struct regulator_bulk_data *consumers);
242 
243 int regulator_count_voltages(struct regulator *regulator);
244 int regulator_list_voltage(struct regulator *regulator, unsigned selector);
245 int regulator_is_supported_voltage(struct regulator *regulator,
246                                    int min_uV, int max_uV);
247 unsigned int regulator_get_linear_step(struct regulator *regulator);
248 int regulator_set_voltage(struct regulator *regulator, int min_uV, int max_uV);
249 int regulator_set_voltage_time(struct regulator *regulator,
250                                int old_uV, int new_uV);
251 int regulator_get_voltage(struct regulator *regulator);
252 int regulator_sync_voltage(struct regulator *regulator);
253 int regulator_set_current_limit(struct regulator *regulator,
254                                int min_uA, int max_uA);
255 int regulator_get_current_limit(struct regulator *regulator);
256 
257 int regulator_set_mode(struct regulator *regulator, unsigned int mode);
258 unsigned int regulator_get_mode(struct regulator *regulator);
259 int regulator_get_error_flags(struct regulator *regulator,
260                                 unsigned int *flags);
261 int regulator_set_load(struct regulator *regulator, int load_uA);
262 
263 int regulator_allow_bypass(struct regulator *regulator, bool allow);
264 
265 struct regmap *regulator_get_regmap(struct regulator *regulator);
266 int regulator_get_hardware_vsel_register(struct regulator *regulator,
267                                          unsigned *vsel_reg,
268                                          unsigned *vsel_mask);
269 int regulator_list_hardware_vsel(struct regulator *regulator,
270                                  unsigned selector);
271 
272 /* regulator notifier block */
273 int regulator_register_notifier(struct regulator *regulator,
274                               struct notifier_block *nb);
275 int devm_regulator_register_notifier(struct regulator *regulator,
276                                      struct notifier_block *nb);
277 int regulator_unregister_notifier(struct regulator *regulator,
278                                 struct notifier_block *nb);
279 void devm_regulator_unregister_notifier(struct regulator *regulator,
280                                         struct notifier_block *nb);
281 
282 /* regulator suspend */
283 int regulator_suspend_enable(struct regulator_dev *rdev,
284                              suspend_state_t state);
285 int regulator_suspend_disable(struct regulator_dev *rdev,
286                               suspend_state_t state);
287 int regulator_set_suspend_voltage(struct regulator *regulator, int min_uV,
288                                   int max_uV, suspend_state_t state);
289 
290 /* driver data - core doesn't touch */
291 void *regulator_get_drvdata(struct regulator *regulator);
292 void regulator_set_drvdata(struct regulator *regulator, void *data);
293 
294 /* misc helpers */
295 
296 void regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers,
297                                      const char *const *supply_names,
298                                      unsigned int num_supplies);
299 
300 bool regulator_is_equal(struct regulator *reg1, struct regulator *reg2);
301 
302 #else
303 
304 /*
305  * Make sure client drivers will still build on systems with no software
306  * controllable voltage or current regulators.
307  */
308 static inline struct regulator *__must_check regulator_get(struct device *dev,
309         const char *id)
310 {
311         /* Nothing except the stubbed out regulator API should be
312          * looking at the value except to check if it is an error
313          * value. Drivers are free to handle NULL specifically by
314          * skipping all regulator API calls, but they don't have to.
315          * Drivers which don't, should make sure they properly handle
316          * corner cases of the API, such as regulator_get_voltage()
317          * returning 0.
318          */
319         return NULL;
320 }
321 
322 static inline struct regulator *__must_check
323 devm_regulator_get(struct device *dev, const char *id)
324 {
325         return NULL;
326 }
327 
328 static inline struct regulator *__must_check
329 regulator_get_exclusive(struct device *dev, const char *id)
330 {
331         return ERR_PTR(-ENODEV);
332 }
333 
334 static inline struct regulator *__must_check
335 regulator_get_optional(struct device *dev, const char *id)
336 {
337         return ERR_PTR(-ENODEV);
338 }
339 
340 
341 static inline struct regulator *__must_check
342 devm_regulator_get_optional(struct device *dev, const char *id)
343 {
344         return ERR_PTR(-ENODEV);
345 }
346 
347 static inline void regulator_put(struct regulator *regulator)
348 {
349 }
350 
351 static inline void devm_regulator_put(struct regulator *regulator)
352 {
353 }
354 
355 static inline int regulator_register_supply_alias(struct device *dev,
356                                                   const char *id,
357                                                   struct device *alias_dev,
358                                                   const char *alias_id)
359 {
360         return 0;
361 }
362 
363 static inline void regulator_unregister_supply_alias(struct device *dev,
364                                                     const char *id)
365 {
366 }
367 
368 static inline int regulator_bulk_register_supply_alias(struct device *dev,
369                                                 const char *const *id,
370                                                 struct device *alias_dev,
371                                                 const char * const *alias_id,
372                                                 int num_id)
373 {
374         return 0;
375 }
376 
377 static inline void regulator_bulk_unregister_supply_alias(struct device *dev,
378                                                 const char * const *id,
379                                                 int num_id)
380 {
381 }
382 
383 static inline int devm_regulator_register_supply_alias(struct device *dev,
384                                                        const char *id,
385                                                        struct device *alias_dev,
386                                                        const char *alias_id)
387 {
388         return 0;
389 }
390 
391 static inline void devm_regulator_unregister_supply_alias(struct device *dev,
392                                                           const char *id)
393 {
394 }
395 
396 static inline int devm_regulator_bulk_register_supply_alias(struct device *dev,
397                                                 const char *const *id,
398                                                 struct device *alias_dev,
399                                                 const char *const *alias_id,
400                                                 int num_id)
401 {
402         return 0;
403 }
404 
405 static inline void devm_regulator_bulk_unregister_supply_alias(
406         struct device *dev, const char *const *id, int num_id)
407 {
408 }
409 
410 static inline int regulator_enable(struct regulator *regulator)
411 {
412         return 0;
413 }
414 
415 static inline int regulator_disable(struct regulator *regulator)
416 {
417         return 0;
418 }
419 
420 static inline int regulator_force_disable(struct regulator *regulator)
421 {
422         return 0;
423 }
424 
425 static inline int regulator_disable_deferred(struct regulator *regulator,
426                                              int ms)
427 {
428         return 0;
429 }
430 
431 static inline int regulator_is_enabled(struct regulator *regulator)
432 {
433         return 1;
434 }
435 
436 static inline int regulator_bulk_get(struct device *dev,
437                                      int num_consumers,
438                                      struct regulator_bulk_data *consumers)
439 {
440         return 0;
441 }
442 
443 static inline int devm_regulator_bulk_get(struct device *dev, int num_consumers,
444                                           struct regulator_bulk_data *consumers)
445 {
446         return 0;
447 }
448 
449 static inline int regulator_bulk_enable(int num_consumers,
450                                         struct regulator_bulk_data *consumers)
451 {
452         return 0;
453 }
454 
455 static inline int regulator_bulk_disable(int num_consumers,
456                                          struct regulator_bulk_data *consumers)
457 {
458         return 0;
459 }
460 
461 static inline int regulator_bulk_force_disable(int num_consumers,
462                                         struct regulator_bulk_data *consumers)
463 {
464         return 0;
465 }
466 
467 static inline void regulator_bulk_free(int num_consumers,
468                                        struct regulator_bulk_data *consumers)
469 {
470 }
471 
472 static inline int regulator_set_voltage(struct regulator *regulator,
473                                         int min_uV, int max_uV)
474 {
475         return 0;
476 }
477 
478 static inline int regulator_set_voltage_time(struct regulator *regulator,
479                                              int old_uV, int new_uV)
480 {
481         return 0;
482 }
483 
484 static inline int regulator_get_voltage(struct regulator *regulator)
485 {
486         return -EINVAL;
487 }
488 
489 static inline int regulator_is_supported_voltage(struct regulator *regulator,
490                                    int min_uV, int max_uV)
491 {
492         return 0;
493 }
494 
495 static inline unsigned int regulator_get_linear_step(struct regulator *regulator)
496 {
497         return 0;
498 }
499 
500 static inline int regulator_set_current_limit(struct regulator *regulator,
501                                              int min_uA, int max_uA)
502 {
503         return 0;
504 }
505 
506 static inline int regulator_get_current_limit(struct regulator *regulator)
507 {
508         return 0;
509 }
510 
511 static inline int regulator_set_mode(struct regulator *regulator,
512         unsigned int mode)
513 {
514         return 0;
515 }
516 
517 static inline unsigned int regulator_get_mode(struct regulator *regulator)
518 {
519         return REGULATOR_MODE_NORMAL;
520 }
521 
522 static inline int regulator_get_error_flags(struct regulator *regulator,
523                                             unsigned int *flags)
524 {
525         return -EINVAL;
526 }
527 
528 static inline int regulator_set_load(struct regulator *regulator, int load_uA)
529 {
530         return 0;
531 }
532 
533 static inline int regulator_allow_bypass(struct regulator *regulator,
534                                          bool allow)
535 {
536         return 0;
537 }
538 
539 static inline struct regmap *regulator_get_regmap(struct regulator *regulator)
540 {
541         return ERR_PTR(-EOPNOTSUPP);
542 }
543 
544 static inline int regulator_get_hardware_vsel_register(struct regulator *regulator,
545                                                        unsigned *vsel_reg,
546                                                        unsigned *vsel_mask)
547 {
548         return -EOPNOTSUPP;
549 }
550 
551 static inline int regulator_list_hardware_vsel(struct regulator *regulator,
552                                                unsigned selector)
553 {
554         return -EOPNOTSUPP;
555 }
556 
557 static inline int regulator_register_notifier(struct regulator *regulator,
558                               struct notifier_block *nb)
559 {
560         return 0;
561 }
562 
563 static inline int devm_regulator_register_notifier(struct regulator *regulator,
564                                                    struct notifier_block *nb)
565 {
566         return 0;
567 }
568 
569 static inline int regulator_unregister_notifier(struct regulator *regulator,
570                                 struct notifier_block *nb)
571 {
572         return 0;
573 }
574 
575 static inline int devm_regulator_unregister_notifier(struct regulator *regulator,
576                                                      struct notifier_block *nb)
577 {
578         return 0;
579 }
580 
581 static inline void *regulator_get_drvdata(struct regulator *regulator)
582 {
583         return NULL;
584 }
585 
586 static inline void regulator_set_drvdata(struct regulator *regulator,
587         void *data)
588 {
589 }
590 
591 static inline int regulator_count_voltages(struct regulator *regulator)
592 {
593         return 0;
594 }
595 
596 static inline int regulator_list_voltage(struct regulator *regulator, unsigned selector)
597 {
598         return -EINVAL;
599 }
600 
601 static inline void
602 regulator_bulk_set_supply_names(struct regulator_bulk_data *consumers,
603                                 const char *const *supply_names,
604                                 unsigned int num_supplies)
605 {
606 }
607 
608 static inline bool
609 regulator_is_equal(struct regulator *reg1, struct regulator *reg2)
610 {
611         return false;
612 }
613 #endif
614 
615 static inline int regulator_set_voltage_triplet(struct regulator *regulator,
616                                                 int min_uV, int target_uV,
617                                                 int max_uV)
618 {
619         if (regulator_set_voltage(regulator, target_uV, max_uV) == 0)
620                 return 0;
621 
622         return regulator_set_voltage(regulator, min_uV, max_uV);
623 }
624 
625 static inline int regulator_set_voltage_tol(struct regulator *regulator,
626                                             int new_uV, int tol_uV)
627 {
628         if (regulator_set_voltage(regulator, new_uV, new_uV + tol_uV) == 0)
629                 return 0;
630         else
631                 return regulator_set_voltage(regulator,
632                                              new_uV - tol_uV, new_uV + tol_uV);
633 }
634 
635 static inline int regulator_is_supported_voltage_tol(struct regulator *regulator,
636                                                      int target_uV, int tol_uV)
637 {
638         return regulator_is_supported_voltage(regulator,
639                                               target_uV - tol_uV,
640                                               target_uV + tol_uV);
641 }
642 
643 #endif
644 

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