1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * devres.c -- Voltage/Current Regulator framework devres implementation.
4 *
5 * Copyright 2013 Linaro Ltd
6 */
7
8#include <linux/kernel.h>
9#include <linux/err.h>
10#include <linux/regmap.h>
11#include <linux/regulator/consumer.h>
12#include <linux/regulator/driver.h>
13#include <linux/module.h>
14
15#include "internal.h"
16
17static void devm_regulator_release(struct device *dev, void *res)
18{
19 regulator_put(regulator: *(struct regulator **)res);
20}
21
22static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
23 int get_type)
24{
25 struct regulator **ptr, *regulator;
26
27 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
28 if (!ptr)
29 return ERR_PTR(error: -ENOMEM);
30
31 regulator = _regulator_get(dev, id, get_type);
32 if (!IS_ERR(ptr: regulator)) {
33 *ptr = regulator;
34 devres_add(dev, res: ptr);
35 } else {
36 devres_free(res: ptr);
37 }
38
39 return regulator;
40}
41
42/**
43 * devm_regulator_get - Resource managed regulator_get()
44 * @dev: device to supply
45 * @id: supply name or regulator ID.
46 *
47 * Managed regulator_get(). Regulators returned from this function are
48 * automatically regulator_put() on driver detach. See regulator_get() for more
49 * information.
50 */
51struct regulator *devm_regulator_get(struct device *dev, const char *id)
52{
53 return _devm_regulator_get(dev, id, get_type: NORMAL_GET);
54}
55EXPORT_SYMBOL_GPL(devm_regulator_get);
56
57/**
58 * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive()
59 * @dev: device to supply
60 * @id: supply name or regulator ID.
61 *
62 * Managed regulator_get_exclusive(). Regulators returned from this function
63 * are automatically regulator_put() on driver detach. See regulator_get() for
64 * more information.
65 */
66struct regulator *devm_regulator_get_exclusive(struct device *dev,
67 const char *id)
68{
69 return _devm_regulator_get(dev, id, get_type: EXCLUSIVE_GET);
70}
71EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);
72
73static void regulator_action_disable(void *d)
74{
75 struct regulator *r = (struct regulator *)d;
76
77 regulator_disable(regulator: r);
78}
79
80static int _devm_regulator_get_enable(struct device *dev, const char *id,
81 int get_type)
82{
83 struct regulator *r;
84 int ret;
85
86 r = _devm_regulator_get(dev, id, get_type);
87 if (IS_ERR(ptr: r))
88 return PTR_ERR(ptr: r);
89
90 ret = regulator_enable(regulator: r);
91 if (!ret)
92 ret = devm_add_action_or_reset(dev, &regulator_action_disable, r);
93
94 if (ret)
95 devm_regulator_put(regulator: r);
96
97 return ret;
98}
99
100/**
101 * devm_regulator_get_enable_optional - Resource managed regulator get and enable
102 * @dev: device to supply
103 * @id: supply name or regulator ID.
104 *
105 * Get and enable regulator for duration of the device life-time.
106 * regulator_disable() and regulator_put() are automatically called on driver
107 * detach. See regulator_get_optional() and regulator_enable() for more
108 * information.
109 */
110int devm_regulator_get_enable_optional(struct device *dev, const char *id)
111{
112 return _devm_regulator_get_enable(dev, id, get_type: OPTIONAL_GET);
113}
114EXPORT_SYMBOL_GPL(devm_regulator_get_enable_optional);
115
116/**
117 * devm_regulator_get_enable - Resource managed regulator get and enable
118 * @dev: device to supply
119 * @id: supply name or regulator ID.
120 *
121 * Get and enable regulator for duration of the device life-time.
122 * regulator_disable() and regulator_put() are automatically called on driver
123 * detach. See regulator_get() and regulator_enable() for more
124 * information.
125 */
126int devm_regulator_get_enable(struct device *dev, const char *id)
127{
128 return _devm_regulator_get_enable(dev, id, get_type: NORMAL_GET);
129}
130EXPORT_SYMBOL_GPL(devm_regulator_get_enable);
131
132/**
133 * devm_regulator_get_optional - Resource managed regulator_get_optional()
134 * @dev: device to supply
135 * @id: supply name or regulator ID.
136 *
137 * Managed regulator_get_optional(). Regulators returned from this
138 * function are automatically regulator_put() on driver detach. See
139 * regulator_get_optional() for more information.
140 */
141struct regulator *devm_regulator_get_optional(struct device *dev,
142 const char *id)
143{
144 return _devm_regulator_get(dev, id, get_type: OPTIONAL_GET);
145}
146EXPORT_SYMBOL_GPL(devm_regulator_get_optional);
147
148/**
149 * devm_regulator_get_enable_read_voltage - Resource managed regulator get and
150 * enable that returns the voltage
151 * @dev: device to supply
152 * @id: supply name or regulator ID.
153 *
154 * Get and enable regulator for duration of the device life-time.
155 * regulator_disable() and regulator_put() are automatically called on driver
156 * detach. See regulator_get_optional(), regulator_enable(), and
157 * regulator_get_voltage() for more information.
158 *
159 * This is a convenience function for supplies that provide a reference voltage
160 * where the consumer driver just needs to know the voltage and keep the
161 * regulator enabled.
162 *
163 * In cases where the supply is not strictly required, callers can check for
164 * -ENODEV error and handle it accordingly.
165 *
166 * Returns: voltage in microvolts on success, or an negative error number on failure.
167 */
168int devm_regulator_get_enable_read_voltage(struct device *dev, const char *id)
169{
170 struct regulator *r;
171 int ret;
172
173 /*
174 * Since we need a real voltage, we use devm_regulator_get_optional()
175 * rather than getting a dummy regulator with devm_regulator_get() and
176 * then letting regulator_get_voltage() fail with -EINVAL. This way, the
177 * caller can handle the -ENODEV negative error number if needed instead
178 * of the ambiguous -EINVAL.
179 */
180 r = devm_regulator_get_optional(dev, id);
181 if (IS_ERR(ptr: r))
182 return PTR_ERR(ptr: r);
183
184 ret = regulator_enable(regulator: r);
185 if (ret)
186 goto err_regulator_put;
187
188 ret = devm_add_action_or_reset(dev, regulator_action_disable, r);
189 if (ret)
190 goto err_regulator_put;
191
192 ret = regulator_get_voltage(regulator: r);
193 if (ret < 0)
194 goto err_release_action;
195
196 return ret;
197
198err_release_action:
199 devm_release_action(dev, action: regulator_action_disable, data: r);
200err_regulator_put:
201 devm_regulator_put(regulator: r);
202
203 return ret;
204}
205EXPORT_SYMBOL_GPL(devm_regulator_get_enable_read_voltage);
206
207static int devm_regulator_match(struct device *dev, void *res, void *data)
208{
209 struct regulator **r = res;
210 if (!r || !*r) {
211 WARN_ON(!r || !*r);
212 return 0;
213 }
214 return *r == data;
215}
216
217/**
218 * devm_regulator_put - Resource managed regulator_put()
219 * @regulator: regulator to free
220 *
221 * Deallocate a regulator allocated with devm_regulator_get(). Normally
222 * this function will not need to be called and the resource management
223 * code will ensure that the resource is freed.
224 */
225void devm_regulator_put(struct regulator *regulator)
226{
227 int rc;
228
229 rc = devres_release(dev: regulator->dev, release: devm_regulator_release,
230 match: devm_regulator_match, match_data: regulator);
231 if (rc != 0)
232 WARN_ON(rc);
233}
234EXPORT_SYMBOL_GPL(devm_regulator_put);
235
236struct regulator_bulk_devres {
237 struct regulator_bulk_data *consumers;
238 int num_consumers;
239};
240
241static void devm_regulator_bulk_release(struct device *dev, void *res)
242{
243 struct regulator_bulk_devres *devres = res;
244
245 regulator_bulk_free(num_consumers: devres->num_consumers, consumers: devres->consumers);
246}
247
248static int _devm_regulator_bulk_get(struct device *dev, int num_consumers,
249 struct regulator_bulk_data *consumers,
250 enum regulator_get_type get_type)
251{
252 struct regulator_bulk_devres *devres;
253 int ret;
254
255 devres = devres_alloc(devm_regulator_bulk_release,
256 sizeof(*devres), GFP_KERNEL);
257 if (!devres)
258 return -ENOMEM;
259
260 ret = _regulator_bulk_get(dev, num_consumers, consumers, get_type);
261 if (!ret) {
262 devres->consumers = consumers;
263 devres->num_consumers = num_consumers;
264 devres_add(dev, res: devres);
265 } else {
266 devres_free(res: devres);
267 }
268
269 return ret;
270}
271
272/**
273 * devm_regulator_bulk_get - managed get multiple regulator consumers
274 *
275 * @dev: device to supply
276 * @num_consumers: number of consumers to register
277 * @consumers: configuration of consumers; clients are stored here.
278 *
279 * @return 0 on success, a negative error number on failure.
280 *
281 * This helper function allows drivers to get several regulator
282 * consumers in one operation with management, the regulators will
283 * automatically be freed when the device is unbound. If any of the
284 * regulators cannot be acquired then any regulators that were
285 * allocated will be freed before returning to the caller.
286 */
287int devm_regulator_bulk_get(struct device *dev, int num_consumers,
288 struct regulator_bulk_data *consumers)
289{
290 return _devm_regulator_bulk_get(dev, num_consumers, consumers, get_type: NORMAL_GET);
291}
292EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
293
294/**
295 * devm_regulator_bulk_get_exclusive - managed exclusive get of multiple
296 * regulator consumers
297 *
298 * @dev: device to supply
299 * @num_consumers: number of consumers to register
300 * @consumers: configuration of consumers; clients are stored here.
301 *
302 * @return 0 on success, a negative error number on failure.
303 *
304 * This helper function allows drivers to exclusively get several
305 * regulator consumers in one operation with management, the regulators
306 * will automatically be freed when the device is unbound. If any of
307 * the regulators cannot be acquired then any regulators that were
308 * allocated will be freed before returning to the caller.
309 */
310int devm_regulator_bulk_get_exclusive(struct device *dev, int num_consumers,
311 struct regulator_bulk_data *consumers)
312{
313 return _devm_regulator_bulk_get(dev, num_consumers, consumers, get_type: EXCLUSIVE_GET);
314}
315EXPORT_SYMBOL_GPL(devm_regulator_bulk_get_exclusive);
316
317/**
318 * devm_regulator_bulk_get_const - devm_regulator_bulk_get() w/ const data
319 *
320 * @dev: device to supply
321 * @num_consumers: number of consumers to register
322 * @in_consumers: const configuration of consumers
323 * @out_consumers: in_consumers is copied here and this is passed to
324 * devm_regulator_bulk_get().
325 *
326 * This is a convenience function to allow bulk regulator configuration
327 * to be stored "static const" in files.
328 *
329 * Return: 0 on success, a negative error number on failure.
330 */
331int devm_regulator_bulk_get_const(struct device *dev, int num_consumers,
332 const struct regulator_bulk_data *in_consumers,
333 struct regulator_bulk_data **out_consumers)
334{
335 *out_consumers = devm_kmemdup_array(dev, src: in_consumers, n: num_consumers,
336 size: sizeof(*in_consumers), GFP_KERNEL);
337 if (*out_consumers == NULL)
338 return -ENOMEM;
339
340 return devm_regulator_bulk_get(dev, num_consumers, *out_consumers);
341}
342EXPORT_SYMBOL_GPL(devm_regulator_bulk_get_const);
343
344static int devm_regulator_bulk_match(struct device *dev, void *res,
345 void *data)
346{
347 struct regulator_bulk_devres *match = res;
348 struct regulator_bulk_data *target = data;
349
350 /*
351 * We check the put uses same consumer list as the get did.
352 * We _could_ scan all entries in consumer array and check the
353 * regulators match but ATM I don't see the need. We can change this
354 * later if needed.
355 */
356 return match->consumers == target;
357}
358
359/**
360 * devm_regulator_bulk_put - Resource managed regulator_bulk_put()
361 * @consumers: consumers to free
362 *
363 * Deallocate regulators allocated with devm_regulator_bulk_get(). Normally
364 * this function will not need to be called and the resource management
365 * code will ensure that the resource is freed.
366 */
367void devm_regulator_bulk_put(struct regulator_bulk_data *consumers)
368{
369 int rc;
370 struct regulator *regulator = consumers[0].consumer;
371
372 rc = devres_release(dev: regulator->dev, release: devm_regulator_bulk_release,
373 match: devm_regulator_bulk_match, match_data: consumers);
374 if (rc != 0)
375 WARN_ON(rc);
376}
377EXPORT_SYMBOL_GPL(devm_regulator_bulk_put);
378
379static void devm_regulator_bulk_disable(void *res)
380{
381 struct regulator_bulk_devres *devres = res;
382 int i;
383
384 for (i = 0; i < devres->num_consumers; i++)
385 regulator_disable(regulator: devres->consumers[i].consumer);
386}
387
388/**
389 * devm_regulator_bulk_get_enable - managed get'n enable multiple regulators
390 *
391 * @dev: device to supply
392 * @num_consumers: number of consumers to register
393 * @id: list of supply names or regulator IDs
394 *
395 * @return 0 on success, a negative error number on failure.
396 *
397 * This helper function allows drivers to get several regulator
398 * consumers in one operation with management, the regulators will
399 * automatically be freed when the device is unbound. If any of the
400 * regulators cannot be acquired then any regulators that were
401 * allocated will be freed before returning to the caller.
402 */
403int devm_regulator_bulk_get_enable(struct device *dev, int num_consumers,
404 const char * const *id)
405{
406 struct regulator_bulk_devres *devres;
407 struct regulator_bulk_data *consumers;
408 int i, ret;
409
410 devres = devm_kmalloc(dev, size: sizeof(*devres), GFP_KERNEL);
411 if (!devres)
412 return -ENOMEM;
413
414 devres->consumers = devm_kcalloc(dev, n: num_consumers, size: sizeof(*consumers),
415 GFP_KERNEL);
416 consumers = devres->consumers;
417 if (!consumers)
418 return -ENOMEM;
419
420 devres->num_consumers = num_consumers;
421
422 for (i = 0; i < num_consumers; i++)
423 consumers[i].supply = id[i];
424
425 ret = devm_regulator_bulk_get(dev, num_consumers, consumers);
426 if (ret)
427 return ret;
428
429 for (i = 0; i < num_consumers; i++) {
430 ret = regulator_enable(regulator: consumers[i].consumer);
431 if (ret)
432 goto unwind;
433 }
434
435 ret = devm_add_action(dev, devm_regulator_bulk_disable, devres);
436 if (!ret)
437 return 0;
438
439unwind:
440 while (--i >= 0)
441 regulator_disable(regulator: consumers[i].consumer);
442
443 devm_regulator_bulk_put(consumers);
444
445 return ret;
446}
447EXPORT_SYMBOL_GPL(devm_regulator_bulk_get_enable);
448
449static void devm_rdev_release(struct device *dev, void *res)
450{
451 regulator_unregister(rdev: *(struct regulator_dev **)res);
452}
453
454/**
455 * devm_regulator_register - Resource managed regulator_register()
456 * @dev: device to supply
457 * @regulator_desc: regulator to register
458 * @config: runtime configuration for regulator
459 *
460 * Called by regulator drivers to register a regulator. Returns a
461 * valid pointer to struct regulator_dev on success or an ERR_PTR() on
462 * error. The regulator will automatically be released when the device
463 * is unbound.
464 */
465struct regulator_dev *devm_regulator_register(struct device *dev,
466 const struct regulator_desc *regulator_desc,
467 const struct regulator_config *config)
468{
469 struct regulator_dev **ptr, *rdev;
470
471 ptr = devres_alloc(devm_rdev_release, sizeof(*ptr),
472 GFP_KERNEL);
473 if (!ptr)
474 return ERR_PTR(error: -ENOMEM);
475
476 rdev = regulator_register(dev, regulator_desc, config);
477 if (!IS_ERR(ptr: rdev)) {
478 *ptr = rdev;
479 devres_add(dev, res: ptr);
480 } else {
481 devres_free(res: ptr);
482 }
483
484 return rdev;
485}
486EXPORT_SYMBOL_GPL(devm_regulator_register);
487
488struct regulator_supply_alias_match {
489 struct device *dev;
490 const char *id;
491};
492
493static int devm_regulator_match_supply_alias(struct device *dev, void *res,
494 void *data)
495{
496 struct regulator_supply_alias_match *match = res;
497 struct regulator_supply_alias_match *target = data;
498
499 return match->dev == target->dev && strcmp(match->id, target->id) == 0;
500}
501
502static void devm_regulator_destroy_supply_alias(struct device *dev, void *res)
503{
504 struct regulator_supply_alias_match *match = res;
505
506 regulator_unregister_supply_alias(dev: match->dev, id: match->id);
507}
508
509/**
510 * devm_regulator_register_supply_alias - Resource managed
511 * regulator_register_supply_alias()
512 *
513 * @dev: device to supply
514 * @id: supply name or regulator ID
515 * @alias_dev: device that should be used to lookup the supply
516 * @alias_id: supply name or regulator ID that should be used to lookup the
517 * supply
518 *
519 * The supply alias will automatically be unregistered when the source
520 * device is unbound.
521 */
522int devm_regulator_register_supply_alias(struct device *dev, const char *id,
523 struct device *alias_dev,
524 const char *alias_id)
525{
526 struct regulator_supply_alias_match *match;
527 int ret;
528
529 match = devres_alloc(devm_regulator_destroy_supply_alias,
530 sizeof(struct regulator_supply_alias_match),
531 GFP_KERNEL);
532 if (!match)
533 return -ENOMEM;
534
535 match->dev = dev;
536 match->id = id;
537
538 ret = regulator_register_supply_alias(dev, id, alias_dev, alias_id);
539 if (ret < 0) {
540 devres_free(res: match);
541 return ret;
542 }
543
544 devres_add(dev, res: match);
545
546 return 0;
547}
548EXPORT_SYMBOL_GPL(devm_regulator_register_supply_alias);
549
550static void devm_regulator_unregister_supply_alias(struct device *dev,
551 const char *id)
552{
553 struct regulator_supply_alias_match match;
554 int rc;
555
556 match.dev = dev;
557 match.id = id;
558
559 rc = devres_release(dev, release: devm_regulator_destroy_supply_alias,
560 match: devm_regulator_match_supply_alias, match_data: &match);
561 if (rc != 0)
562 WARN_ON(rc);
563}
564
565/**
566 * devm_regulator_bulk_register_supply_alias - Managed register
567 * multiple aliases
568 *
569 * @dev: device to supply
570 * @id: list of supply names or regulator IDs
571 * @alias_dev: device that should be used to lookup the supply
572 * @alias_id: list of supply names or regulator IDs that should be used to
573 * lookup the supply
574 * @num_id: number of aliases to register
575 *
576 * @return 0 on success, a negative error number on failure.
577 *
578 * This helper function allows drivers to register several supply
579 * aliases in one operation, the aliases will be automatically
580 * unregisters when the source device is unbound. If any of the
581 * aliases cannot be registered any aliases that were registered
582 * will be removed before returning to the caller.
583 */
584int devm_regulator_bulk_register_supply_alias(struct device *dev,
585 const char *const *id,
586 struct device *alias_dev,
587 const char *const *alias_id,
588 int num_id)
589{
590 int i;
591 int ret;
592
593 for (i = 0; i < num_id; ++i) {
594 ret = devm_regulator_register_supply_alias(dev, id[i],
595 alias_dev,
596 alias_id[i]);
597 if (ret < 0)
598 goto err;
599 }
600
601 return 0;
602
603err:
604 dev_err(dev,
605 "Failed to create supply alias %s,%s -> %s,%s\n",
606 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
607
608 while (--i >= 0)
609 devm_regulator_unregister_supply_alias(dev, id: id[i]);
610
611 return ret;
612}
613EXPORT_SYMBOL_GPL(devm_regulator_bulk_register_supply_alias);
614
615struct regulator_notifier_match {
616 struct regulator *regulator;
617 struct notifier_block *nb;
618};
619
620static int devm_regulator_match_notifier(struct device *dev, void *res,
621 void *data)
622{
623 struct regulator_notifier_match *match = res;
624 struct regulator_notifier_match *target = data;
625
626 return match->regulator == target->regulator && match->nb == target->nb;
627}
628
629static void devm_regulator_destroy_notifier(struct device *dev, void *res)
630{
631 struct regulator_notifier_match *match = res;
632
633 regulator_unregister_notifier(regulator: match->regulator, nb: match->nb);
634}
635
636/**
637 * devm_regulator_register_notifier - Resource managed
638 * regulator_register_notifier
639 *
640 * @regulator: regulator source
641 * @nb: notifier block
642 *
643 * The notifier will be registers under the consumer device and be
644 * automatically be unregistered when the source device is unbound.
645 */
646int devm_regulator_register_notifier(struct regulator *regulator,
647 struct notifier_block *nb)
648{
649 struct regulator_notifier_match *match;
650 int ret;
651
652 match = devres_alloc(devm_regulator_destroy_notifier,
653 sizeof(struct regulator_notifier_match),
654 GFP_KERNEL);
655 if (!match)
656 return -ENOMEM;
657
658 match->regulator = regulator;
659 match->nb = nb;
660
661 ret = regulator_register_notifier(regulator, nb);
662 if (ret < 0) {
663 devres_free(res: match);
664 return ret;
665 }
666
667 devres_add(dev: regulator->dev, res: match);
668
669 return 0;
670}
671EXPORT_SYMBOL_GPL(devm_regulator_register_notifier);
672
673/**
674 * devm_regulator_unregister_notifier - Resource managed
675 * regulator_unregister_notifier()
676 *
677 * @regulator: regulator source
678 * @nb: notifier block
679 *
680 * Unregister a notifier registered with devm_regulator_register_notifier().
681 * Normally this function will not need to be called and the resource
682 * management code will ensure that the resource is freed.
683 */
684void devm_regulator_unregister_notifier(struct regulator *regulator,
685 struct notifier_block *nb)
686{
687 struct regulator_notifier_match match;
688 int rc;
689
690 match.regulator = regulator;
691 match.nb = nb;
692
693 rc = devres_release(dev: regulator->dev, release: devm_regulator_destroy_notifier,
694 match: devm_regulator_match_notifier, match_data: &match);
695 if (rc != 0)
696 WARN_ON(rc);
697}
698EXPORT_SYMBOL_GPL(devm_regulator_unregister_notifier);
699
700static void regulator_irq_helper_drop(void *res)
701{
702 regulator_irq_helper_cancel(handle: &res);
703}
704
705/**
706 * devm_regulator_irq_helper - resource managed registration of IRQ based
707 * regulator event/error notifier
708 *
709 * @dev: device to which lifetime the helper's lifetime is
710 * bound.
711 * @d: IRQ helper descriptor.
712 * @irq: IRQ used to inform events/errors to be notified.
713 * @irq_flags: Extra IRQ flags to be OR'ed with the default
714 * IRQF_ONESHOT when requesting the (threaded) irq.
715 * @common_errs: Errors which can be flagged by this IRQ for all rdevs.
716 * When IRQ is re-enabled these errors will be cleared
717 * from all associated regulators
718 * @per_rdev_errs: Optional error flag array describing errors specific
719 * for only some of the regulators. These errors will be
720 * or'ed with common errors. If this is given the array
721 * should contain rdev_amount flags. Can be set to NULL
722 * if there is no regulator specific error flags for this
723 * IRQ.
724 * @rdev: Array of pointers to regulators associated with this
725 * IRQ.
726 * @rdev_amount: Amount of regulators associated with this IRQ.
727 *
728 * Return: handle to irq_helper or an ERR_PTR() encoded negative error number.
729 */
730void *devm_regulator_irq_helper(struct device *dev,
731 const struct regulator_irq_desc *d, int irq,
732 int irq_flags, int common_errs,
733 int *per_rdev_errs,
734 struct regulator_dev **rdev, int rdev_amount)
735{
736 void *ptr;
737 int ret;
738
739 ptr = regulator_irq_helper(dev, d, irq, irq_flags, common_errs,
740 per_rdev_errs, rdev, rdev_amount);
741 if (IS_ERR(ptr))
742 return ptr;
743
744 ret = devm_add_action_or_reset(dev, regulator_irq_helper_drop, ptr);
745 if (ret)
746 return ERR_PTR(error: ret);
747
748 return ptr;
749}
750EXPORT_SYMBOL_GPL(devm_regulator_irq_helper);
751
752#if IS_ENABLED(CONFIG_OF)
753static struct regulator *_devm_of_regulator_get(struct device *dev, struct device_node *node,
754 const char *id, int get_type)
755{
756 struct regulator **ptr, *regulator;
757
758 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
759 if (!ptr)
760 return ERR_PTR(error: -ENOMEM);
761
762 regulator = _of_regulator_get(dev, node, id, get_type);
763 if (!IS_ERR(ptr: regulator)) {
764 *ptr = regulator;
765 devres_add(dev, res: ptr);
766 } else {
767 devres_free(res: ptr);
768 }
769
770 return regulator;
771}
772
773/**
774 * devm_of_regulator_get - Resource managed of_regulator_get()
775 * @dev: device used for dev_printk() messages and resource lifetime management
776 * @node: device node for regulator "consumer"
777 * @id: supply name or regulator ID.
778 *
779 * Managed of_regulator_get(). Regulators returned from this
780 * function are automatically regulator_put() on driver detach. See
781 * of_regulator_get() for more information.
782 */
783struct regulator *devm_of_regulator_get(struct device *dev, struct device_node *node,
784 const char *id)
785{
786 return _devm_of_regulator_get(dev, node, id, get_type: NORMAL_GET);
787}
788EXPORT_SYMBOL_GPL(devm_of_regulator_get);
789
790/**
791 * devm_of_regulator_get_optional - Resource managed of_regulator_get_optional()
792 * @dev: device used for dev_printk() messages and resource lifetime management
793 * @node: device node for regulator "consumer"
794 * @id: supply name or regulator ID.
795 *
796 * Managed regulator_get_optional(). Regulators returned from this
797 * function are automatically regulator_put() on driver detach. See
798 * of_regulator_get_optional() for more information.
799 */
800struct regulator *devm_of_regulator_get_optional(struct device *dev, struct device_node *node,
801 const char *id)
802{
803 return _devm_of_regulator_get(dev, node, id, get_type: OPTIONAL_GET);
804}
805EXPORT_SYMBOL_GPL(devm_of_regulator_get_optional);
806#endif
807

source code of linux/drivers/regulator/devres.c