1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * devres.c -- Voltage/Current Regulator framework devres implementation.
5 * Copyright 2013 Linaro Ltd
8 #include <linux/kernel.h>
10 #include <linux/regmap.h>
11 #include <linux/regulator/consumer.h>
12 #include <linux/regulator/driver.h>
13 #include <linux/module.h>
17 static void devm_regulator_release(struct device *dev, void *res)
19 regulator_put(*(struct regulator **)res);
22 static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
25 struct regulator **ptr, *regulator;
27 ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
29 return ERR_PTR(-ENOMEM);
31 regulator = _regulator_get(dev, id, get_type);
32 if (!IS_ERR(regulator)) {
43 * devm_regulator_get - Resource managed regulator_get()
44 * @dev: device to supply
45 * @id: supply name or regulator ID.
47 * Managed regulator_get(). Regulators returned from this function are
48 * automatically regulator_put() on driver detach. See regulator_get() for more
51 struct regulator *devm_regulator_get(struct device *dev, const char *id)
53 return _devm_regulator_get(dev, id, NORMAL_GET);
55 EXPORT_SYMBOL_GPL(devm_regulator_get);
58 * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive()
59 * @dev: device to supply
60 * @id: supply name or regulator ID.
62 * Managed regulator_get_exclusive(). Regulators returned from this function
63 * are automatically regulator_put() on driver detach. See regulator_get() for
66 struct regulator *devm_regulator_get_exclusive(struct device *dev,
69 return _devm_regulator_get(dev, id, EXCLUSIVE_GET);
71 EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);
74 * devm_regulator_get_optional - Resource managed regulator_get_optional()
75 * @dev: device to supply
76 * @id: supply name or regulator ID.
78 * Managed regulator_get_optional(). Regulators returned from this
79 * function are automatically regulator_put() on driver detach. See
80 * regulator_get_optional() for more information.
82 struct regulator *devm_regulator_get_optional(struct device *dev,
85 return _devm_regulator_get(dev, id, OPTIONAL_GET);
87 EXPORT_SYMBOL_GPL(devm_regulator_get_optional);
89 static int devm_regulator_match(struct device *dev, void *res, void *data)
91 struct regulator **r = res;
100 * devm_regulator_put - Resource managed regulator_put()
101 * @regulator: regulator to free
103 * Deallocate a regulator allocated with devm_regulator_get(). Normally
104 * this function will not need to be called and the resource management
105 * code will ensure that the resource is freed.
107 void devm_regulator_put(struct regulator *regulator)
111 rc = devres_release(regulator->dev, devm_regulator_release,
112 devm_regulator_match, regulator);
116 EXPORT_SYMBOL_GPL(devm_regulator_put);
118 struct regulator_bulk_devres {
119 struct regulator_bulk_data *consumers;
123 static void devm_regulator_bulk_release(struct device *dev, void *res)
125 struct regulator_bulk_devres *devres = res;
127 regulator_bulk_free(devres->num_consumers, devres->consumers);
131 * devm_regulator_bulk_get - managed get multiple regulator consumers
133 * @dev: device to supply
134 * @num_consumers: number of consumers to register
135 * @consumers: configuration of consumers; clients are stored here.
137 * @return 0 on success, an errno on failure.
139 * This helper function allows drivers to get several regulator
140 * consumers in one operation with management, the regulators will
141 * automatically be freed when the device is unbound. If any of the
142 * regulators cannot be acquired then any regulators that were
143 * allocated will be freed before returning to the caller.
145 int devm_regulator_bulk_get(struct device *dev, int num_consumers,
146 struct regulator_bulk_data *consumers)
148 struct regulator_bulk_devres *devres;
151 devres = devres_alloc(devm_regulator_bulk_release,
152 sizeof(*devres), GFP_KERNEL);
156 ret = regulator_bulk_get(dev, num_consumers, consumers);
158 devres->consumers = consumers;
159 devres->num_consumers = num_consumers;
160 devres_add(dev, devres);
167 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
169 static void devm_rdev_release(struct device *dev, void *res)
171 regulator_unregister(*(struct regulator_dev **)res);
175 * devm_regulator_register - Resource managed regulator_register()
176 * @dev: device to supply
177 * @regulator_desc: regulator to register
178 * @config: runtime configuration for regulator
180 * Called by regulator drivers to register a regulator. Returns a
181 * valid pointer to struct regulator_dev on success or an ERR_PTR() on
182 * error. The regulator will automatically be released when the device
185 struct regulator_dev *devm_regulator_register(struct device *dev,
186 const struct regulator_desc *regulator_desc,
187 const struct regulator_config *config)
189 struct regulator_dev **ptr, *rdev;
191 ptr = devres_alloc(devm_rdev_release, sizeof(*ptr),
194 return ERR_PTR(-ENOMEM);
196 rdev = regulator_register(regulator_desc, config);
199 devres_add(dev, ptr);
206 EXPORT_SYMBOL_GPL(devm_regulator_register);
208 struct regulator_supply_alias_match {
213 static int devm_regulator_match_supply_alias(struct device *dev, void *res,
216 struct regulator_supply_alias_match *match = res;
217 struct regulator_supply_alias_match *target = data;
219 return match->dev == target->dev && strcmp(match->id, target->id) == 0;
222 static void devm_regulator_destroy_supply_alias(struct device *dev, void *res)
224 struct regulator_supply_alias_match *match = res;
226 regulator_unregister_supply_alias(match->dev, match->id);
230 * devm_regulator_register_supply_alias - Resource managed
231 * regulator_register_supply_alias()
233 * @dev: device to supply
234 * @id: supply name or regulator ID
235 * @alias_dev: device that should be used to lookup the supply
236 * @alias_id: supply name or regulator ID that should be used to lookup the
239 * The supply alias will automatically be unregistered when the source
242 int devm_regulator_register_supply_alias(struct device *dev, const char *id,
243 struct device *alias_dev,
244 const char *alias_id)
246 struct regulator_supply_alias_match *match;
249 match = devres_alloc(devm_regulator_destroy_supply_alias,
250 sizeof(struct regulator_supply_alias_match),
258 ret = regulator_register_supply_alias(dev, id, alias_dev, alias_id);
264 devres_add(dev, match);
268 EXPORT_SYMBOL_GPL(devm_regulator_register_supply_alias);
270 static void devm_regulator_unregister_supply_alias(struct device *dev,
273 struct regulator_supply_alias_match match;
279 rc = devres_release(dev, devm_regulator_destroy_supply_alias,
280 devm_regulator_match_supply_alias, &match);
286 * devm_regulator_bulk_register_supply_alias - Managed register
289 * @dev: device to supply
290 * @id: list of supply names or regulator IDs
291 * @alias_dev: device that should be used to lookup the supply
292 * @alias_id: list of supply names or regulator IDs that should be used to
294 * @num_id: number of aliases to register
296 * @return 0 on success, an errno on failure.
298 * This helper function allows drivers to register several supply
299 * aliases in one operation, the aliases will be automatically
300 * unregisters when the source device is unbound. If any of the
301 * aliases cannot be registered any aliases that were registered
302 * will be removed before returning to the caller.
304 int devm_regulator_bulk_register_supply_alias(struct device *dev,
305 const char *const *id,
306 struct device *alias_dev,
307 const char *const *alias_id,
313 for (i = 0; i < num_id; ++i) {
314 ret = devm_regulator_register_supply_alias(dev, id[i],
325 "Failed to create supply alias %s,%s -> %s,%s\n",
326 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
329 devm_regulator_unregister_supply_alias(dev, id[i]);
333 EXPORT_SYMBOL_GPL(devm_regulator_bulk_register_supply_alias);
335 struct regulator_notifier_match {
336 struct regulator *regulator;
337 struct notifier_block *nb;
340 static int devm_regulator_match_notifier(struct device *dev, void *res,
343 struct regulator_notifier_match *match = res;
344 struct regulator_notifier_match *target = data;
346 return match->regulator == target->regulator && match->nb == target->nb;
349 static void devm_regulator_destroy_notifier(struct device *dev, void *res)
351 struct regulator_notifier_match *match = res;
353 regulator_unregister_notifier(match->regulator, match->nb);
357 * devm_regulator_register_notifier - Resource managed
358 * regulator_register_notifier
360 * @regulator: regulator source
361 * @nb: notifier block
363 * The notifier will be registers under the consumer device and be
364 * automatically be unregistered when the source device is unbound.
366 int devm_regulator_register_notifier(struct regulator *regulator,
367 struct notifier_block *nb)
369 struct regulator_notifier_match *match;
372 match = devres_alloc(devm_regulator_destroy_notifier,
373 sizeof(struct regulator_notifier_match),
378 match->regulator = regulator;
381 ret = regulator_register_notifier(regulator, nb);
387 devres_add(regulator->dev, match);
391 EXPORT_SYMBOL_GPL(devm_regulator_register_notifier);
394 * devm_regulator_unregister_notifier - Resource managed
395 * regulator_unregister_notifier()
397 * @regulator: regulator source
398 * @nb: notifier block
400 * Unregister a notifier registered with devm_regulator_register_notifier().
401 * Normally this function will not need to be called and the resource
402 * management code will ensure that the resource is freed.
404 void devm_regulator_unregister_notifier(struct regulator *regulator,
405 struct notifier_block *nb)
407 struct regulator_notifier_match match;
410 match.regulator = regulator;
413 rc = devres_release(regulator->dev, devm_regulator_destroy_notifier,
414 devm_regulator_match_notifier, &match);
418 EXPORT_SYMBOL_GPL(devm_regulator_unregister_notifier);
420 static void regulator_irq_helper_drop(void *res)
422 regulator_irq_helper_cancel(&res);
426 * devm_regulator_irq_helper - resource managed registration of IRQ based
427 * regulator event/error notifier
429 * @dev: device to which lifetime the helper's lifetime is
431 * @d: IRQ helper descriptor.
432 * @irq: IRQ used to inform events/errors to be notified.
433 * @irq_flags: Extra IRQ flags to be OR'ed with the default
434 * IRQF_ONESHOT when requesting the (threaded) irq.
435 * @common_errs: Errors which can be flagged by this IRQ for all rdevs.
436 * When IRQ is re-enabled these errors will be cleared
437 * from all associated regulators
438 * @per_rdev_errs: Optional error flag array describing errors specific
439 * for only some of the regulators. These errors will be
440 * or'ed with common errors. If this is given the array
441 * should contain rdev_amount flags. Can be set to NULL
442 * if there is no regulator specific error flags for this
444 * @rdev: Array of pointers to regulators associated with this
446 * @rdev_amount: Amount of regulators associated with this IRQ.
448 * Return: handle to irq_helper or an ERR_PTR() encoded error code.
450 void *devm_regulator_irq_helper(struct device *dev,
451 const struct regulator_irq_desc *d, int irq,
452 int irq_flags, int common_errs,
454 struct regulator_dev **rdev, int rdev_amount)
459 ptr = regulator_irq_helper(dev, d, irq, irq_flags, common_errs,
460 per_rdev_errs, rdev, rdev_amount);
464 ret = devm_add_action_or_reset(dev, regulator_irq_helper_drop, ptr);
470 EXPORT_SYMBOL_GPL(devm_regulator_irq_helper);