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);
170 * devm_regulator_bulk_get_const - devm_regulator_bulk_get() w/ const data
172 * @dev: device to supply
173 * @num_consumers: number of consumers to register
174 * @in_consumers: const configuration of consumers
175 * @out_consumers: in_consumers is copied here and this is passed to
176 * devm_regulator_bulk_get().
178 * This is a convenience function to allow bulk regulator configuration
179 * to be stored "static const" in files.
181 * Return: 0 on success, an errno on failure.
183 int devm_regulator_bulk_get_const(struct device *dev, int num_consumers,
184 const struct regulator_bulk_data *in_consumers,
185 struct regulator_bulk_data **out_consumers)
187 *out_consumers = devm_kmemdup(dev, in_consumers,
188 num_consumers * sizeof(*in_consumers),
190 if (*out_consumers == NULL)
193 return devm_regulator_bulk_get(dev, num_consumers, *out_consumers);
195 EXPORT_SYMBOL_GPL(devm_regulator_bulk_get_const);
197 static void devm_rdev_release(struct device *dev, void *res)
199 regulator_unregister(*(struct regulator_dev **)res);
203 * devm_regulator_register - Resource managed regulator_register()
204 * @dev: device to supply
205 * @regulator_desc: regulator to register
206 * @config: runtime configuration for regulator
208 * Called by regulator drivers to register a regulator. Returns a
209 * valid pointer to struct regulator_dev on success or an ERR_PTR() on
210 * error. The regulator will automatically be released when the device
213 struct regulator_dev *devm_regulator_register(struct device *dev,
214 const struct regulator_desc *regulator_desc,
215 const struct regulator_config *config)
217 struct regulator_dev **ptr, *rdev;
219 ptr = devres_alloc(devm_rdev_release, sizeof(*ptr),
222 return ERR_PTR(-ENOMEM);
224 rdev = regulator_register(regulator_desc, config);
227 devres_add(dev, ptr);
234 EXPORT_SYMBOL_GPL(devm_regulator_register);
236 struct regulator_supply_alias_match {
241 static int devm_regulator_match_supply_alias(struct device *dev, void *res,
244 struct regulator_supply_alias_match *match = res;
245 struct regulator_supply_alias_match *target = data;
247 return match->dev == target->dev && strcmp(match->id, target->id) == 0;
250 static void devm_regulator_destroy_supply_alias(struct device *dev, void *res)
252 struct regulator_supply_alias_match *match = res;
254 regulator_unregister_supply_alias(match->dev, match->id);
258 * devm_regulator_register_supply_alias - Resource managed
259 * regulator_register_supply_alias()
261 * @dev: device to supply
262 * @id: supply name or regulator ID
263 * @alias_dev: device that should be used to lookup the supply
264 * @alias_id: supply name or regulator ID that should be used to lookup the
267 * The supply alias will automatically be unregistered when the source
270 int devm_regulator_register_supply_alias(struct device *dev, const char *id,
271 struct device *alias_dev,
272 const char *alias_id)
274 struct regulator_supply_alias_match *match;
277 match = devres_alloc(devm_regulator_destroy_supply_alias,
278 sizeof(struct regulator_supply_alias_match),
286 ret = regulator_register_supply_alias(dev, id, alias_dev, alias_id);
292 devres_add(dev, match);
296 EXPORT_SYMBOL_GPL(devm_regulator_register_supply_alias);
298 static void devm_regulator_unregister_supply_alias(struct device *dev,
301 struct regulator_supply_alias_match match;
307 rc = devres_release(dev, devm_regulator_destroy_supply_alias,
308 devm_regulator_match_supply_alias, &match);
314 * devm_regulator_bulk_register_supply_alias - Managed register
317 * @dev: device to supply
318 * @id: list of supply names or regulator IDs
319 * @alias_dev: device that should be used to lookup the supply
320 * @alias_id: list of supply names or regulator IDs that should be used to
322 * @num_id: number of aliases to register
324 * @return 0 on success, an errno on failure.
326 * This helper function allows drivers to register several supply
327 * aliases in one operation, the aliases will be automatically
328 * unregisters when the source device is unbound. If any of the
329 * aliases cannot be registered any aliases that were registered
330 * will be removed before returning to the caller.
332 int devm_regulator_bulk_register_supply_alias(struct device *dev,
333 const char *const *id,
334 struct device *alias_dev,
335 const char *const *alias_id,
341 for (i = 0; i < num_id; ++i) {
342 ret = devm_regulator_register_supply_alias(dev, id[i],
353 "Failed to create supply alias %s,%s -> %s,%s\n",
354 id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
357 devm_regulator_unregister_supply_alias(dev, id[i]);
361 EXPORT_SYMBOL_GPL(devm_regulator_bulk_register_supply_alias);
363 struct regulator_notifier_match {
364 struct regulator *regulator;
365 struct notifier_block *nb;
368 static int devm_regulator_match_notifier(struct device *dev, void *res,
371 struct regulator_notifier_match *match = res;
372 struct regulator_notifier_match *target = data;
374 return match->regulator == target->regulator && match->nb == target->nb;
377 static void devm_regulator_destroy_notifier(struct device *dev, void *res)
379 struct regulator_notifier_match *match = res;
381 regulator_unregister_notifier(match->regulator, match->nb);
385 * devm_regulator_register_notifier - Resource managed
386 * regulator_register_notifier
388 * @regulator: regulator source
389 * @nb: notifier block
391 * The notifier will be registers under the consumer device and be
392 * automatically be unregistered when the source device is unbound.
394 int devm_regulator_register_notifier(struct regulator *regulator,
395 struct notifier_block *nb)
397 struct regulator_notifier_match *match;
400 match = devres_alloc(devm_regulator_destroy_notifier,
401 sizeof(struct regulator_notifier_match),
406 match->regulator = regulator;
409 ret = regulator_register_notifier(regulator, nb);
415 devres_add(regulator->dev, match);
419 EXPORT_SYMBOL_GPL(devm_regulator_register_notifier);
422 * devm_regulator_unregister_notifier - Resource managed
423 * regulator_unregister_notifier()
425 * @regulator: regulator source
426 * @nb: notifier block
428 * Unregister a notifier registered with devm_regulator_register_notifier().
429 * Normally this function will not need to be called and the resource
430 * management code will ensure that the resource is freed.
432 void devm_regulator_unregister_notifier(struct regulator *regulator,
433 struct notifier_block *nb)
435 struct regulator_notifier_match match;
438 match.regulator = regulator;
441 rc = devres_release(regulator->dev, devm_regulator_destroy_notifier,
442 devm_regulator_match_notifier, &match);
446 EXPORT_SYMBOL_GPL(devm_regulator_unregister_notifier);
448 static void regulator_irq_helper_drop(void *res)
450 regulator_irq_helper_cancel(&res);
454 * devm_regulator_irq_helper - resource managed registration of IRQ based
455 * regulator event/error notifier
457 * @dev: device to which lifetime the helper's lifetime is
459 * @d: IRQ helper descriptor.
460 * @irq: IRQ used to inform events/errors to be notified.
461 * @irq_flags: Extra IRQ flags to be OR'ed with the default
462 * IRQF_ONESHOT when requesting the (threaded) irq.
463 * @common_errs: Errors which can be flagged by this IRQ for all rdevs.
464 * When IRQ is re-enabled these errors will be cleared
465 * from all associated regulators
466 * @per_rdev_errs: Optional error flag array describing errors specific
467 * for only some of the regulators. These errors will be
468 * or'ed with common errors. If this is given the array
469 * should contain rdev_amount flags. Can be set to NULL
470 * if there is no regulator specific error flags for this
472 * @rdev: Array of pointers to regulators associated with this
474 * @rdev_amount: Amount of regulators associated with this IRQ.
476 * Return: handle to irq_helper or an ERR_PTR() encoded error code.
478 void *devm_regulator_irq_helper(struct device *dev,
479 const struct regulator_irq_desc *d, int irq,
480 int irq_flags, int common_errs,
482 struct regulator_dev **rdev, int rdev_amount)
487 ptr = regulator_irq_helper(dev, d, irq, irq_flags, common_errs,
488 per_rdev_errs, rdev, rdev_amount);
492 ret = devm_add_action_or_reset(dev, regulator_irq_helper_drop, ptr);
498 EXPORT_SYMBOL_GPL(devm_regulator_irq_helper);