[mirror_ubuntu-jammy-kernel.git] / drivers / regulator / devres.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * devres.c  --  Voltage/Current Regulator framework devres implementation.
 *
 * Copyright 2013 Linaro Ltd
 */

#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/regulator/driver.h>
#include <linux/module.h>

#include "internal.h"

static void devm_regulator_release(struct device *dev, void *res)
{
	regulator_put(*(struct regulator **)res);
}

static struct regulator *_devm_regulator_get(struct device *dev, const char *id,
					     int get_type)
{
	struct regulator **ptr, *regulator;

	ptr = devres_alloc(devm_regulator_release, sizeof(*ptr), GFP_KERNEL);
	if (!ptr)
		return ERR_PTR(-ENOMEM);

	regulator = _regulator_get(dev, id, get_type);
	if (!IS_ERR(regulator)) {
		*ptr = regulator;
		devres_add(dev, ptr);
	} else {
		devres_free(ptr);
	}

	return regulator;
}

/**
 * devm_regulator_get - Resource managed regulator_get()
 * @dev: device for regulator "consumer"
 * @id: Supply name or regulator ID.
 *
 * Managed regulator_get(). Regulators returned from this function are
 * automatically regulator_put() on driver detach. See regulator_get() for more
 * information.
 */
struct regulator *devm_regulator_get(struct device *dev, const char *id)
{
	return _devm_regulator_get(dev, id, NORMAL_GET);
}
EXPORT_SYMBOL_GPL(devm_regulator_get);

/**
 * devm_regulator_get_exclusive - Resource managed regulator_get_exclusive()
 * @dev: device for regulator "consumer"
 * @id: Supply name or regulator ID.
 *
 * Managed regulator_get_exclusive(). Regulators returned from this function
 * are automatically regulator_put() on driver detach. See regulator_get() for
 * more information.
 */
struct regulator *devm_regulator_get_exclusive(struct device *dev,
					       const char *id)
{
	return _devm_regulator_get(dev, id, EXCLUSIVE_GET);
}
EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);

/**
 * devm_regulator_get_optional - Resource managed regulator_get_optional()
 * @dev: device for regulator "consumer"
 * @id: Supply name or regulator ID.
 *
 * Managed regulator_get_optional(). Regulators returned from this
 * function are automatically regulator_put() on driver detach. See
 * regulator_get_optional() for more information.
 */
struct regulator *devm_regulator_get_optional(struct device *dev,
					      const char *id)
{
	return _devm_regulator_get(dev, id, OPTIONAL_GET);
}
EXPORT_SYMBOL_GPL(devm_regulator_get_optional);

static int devm_regulator_match(struct device *dev, void *res, void *data)
{
	struct regulator **r = res;
	if (!r || !*r) {
		WARN_ON(!r || !*r);
		return 0;
	}
	return *r == data;
}

/**
 * devm_regulator_put - Resource managed regulator_put()
 * @regulator: regulator to free
 *
 * Deallocate a regulator allocated with devm_regulator_get(). Normally
 * this function will not need to be called and the resource management
 * code will ensure that the resource is freed.
 */
void devm_regulator_put(struct regulator *regulator)
{
	int rc;

	rc = devres_release(regulator->dev, devm_regulator_release,
			    devm_regulator_match, regulator);
	if (rc != 0)
		WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_regulator_put);

struct regulator_bulk_devres {
	struct regulator_bulk_data *consumers;
	int num_consumers;
};

static void devm_regulator_bulk_release(struct device *dev, void *res)
{
	struct regulator_bulk_devres *devres = res;

	regulator_bulk_free(devres->num_consumers, devres->consumers);
}

/**
 * devm_regulator_bulk_get - managed get multiple regulator consumers
 *
 * @dev:           Device to supply
 * @num_consumers: Number of consumers to register
 * @consumers:     Configuration of consumers; clients are stored here.
 *
 * @return 0 on success, an errno on failure.
 *
 * This helper function allows drivers to get several regulator
 * consumers in one operation with management, the regulators will
 * automatically be freed when the device is unbound.  If any of the
 * regulators cannot be acquired then any regulators that were
 * allocated will be freed before returning to the caller.
 */
int devm_regulator_bulk_get(struct device *dev, int num_consumers,
			    struct regulator_bulk_data *consumers)
{
	struct regulator_bulk_devres *devres;
	int ret;

	devres = devres_alloc(devm_regulator_bulk_release,
			      sizeof(*devres), GFP_KERNEL);
	if (!devres)
		return -ENOMEM;

	ret = regulator_bulk_get(dev, num_consumers, consumers);
	if (!ret) {
		devres->consumers = consumers;
		devres->num_consumers = num_consumers;
		devres_add(dev, devres);
	} else {
		devres_free(devres);
	}

	return ret;
}
EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);

static void devm_rdev_release(struct device *dev, void *res)
{
	regulator_unregister(*(struct regulator_dev **)res);
}

/**
 * devm_regulator_register - Resource managed regulator_register()
 * @regulator_desc: regulator to register
 * @config: runtime configuration for regulator
 *
 * Called by regulator drivers to register a regulator.  Returns a
 * valid pointer to struct regulator_dev on success or an ERR_PTR() on
 * error.  The regulator will automatically be released when the device
 * is unbound.
 */
struct regulator_dev *devm_regulator_register(struct device *dev,
				  const struct regulator_desc *regulator_desc,
				  const struct regulator_config *config)
{
	struct regulator_dev **ptr, *rdev;

	ptr = devres_alloc(devm_rdev_release, sizeof(*ptr),
			   GFP_KERNEL);
	if (!ptr)
		return ERR_PTR(-ENOMEM);

	rdev = regulator_register(regulator_desc, config);
	if (!IS_ERR(rdev)) {
		*ptr = rdev;
		devres_add(dev, ptr);
	} else {
		devres_free(ptr);
	}

	return rdev;
}
EXPORT_SYMBOL_GPL(devm_regulator_register);

static int devm_rdev_match(struct device *dev, void *res, void *data)
{
	struct regulator_dev **r = res;
	if (!r || !*r) {
		WARN_ON(!r || !*r);
		return 0;
	}
	return *r == data;
}

/**
 * devm_regulator_unregister - Resource managed regulator_unregister()
 * @regulator: regulator to free
 *
 * Unregister a regulator registered with devm_regulator_register().
 * Normally this function will not need to be called and the resource
 * management code will ensure that the resource is freed.
 */
void devm_regulator_unregister(struct device *dev, struct regulator_dev *rdev)
{
	int rc;

	rc = devres_release(dev, devm_rdev_release, devm_rdev_match, rdev);
	if (rc != 0)
		WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_regulator_unregister);

struct regulator_supply_alias_match {
	struct device *dev;
	const char *id;
};

static int devm_regulator_match_supply_alias(struct device *dev, void *res,
					     void *data)
{
	struct regulator_supply_alias_match *match = res;
	struct regulator_supply_alias_match *target = data;

	return match->dev == target->dev && strcmp(match->id, target->id) == 0;
}

static void devm_regulator_destroy_supply_alias(struct device *dev, void *res)
{
	struct regulator_supply_alias_match *match = res;

	regulator_unregister_supply_alias(match->dev, match->id);
}

/**
 * devm_regulator_register_supply_alias - Resource managed
 * regulator_register_supply_alias()
 *
 * @dev: device that will be given as the regulator "consumer"
 * @id: Supply name or regulator ID
 * @alias_dev: device that should be used to lookup the supply
 * @alias_id: Supply name or regulator ID that should be used to lookup the
 * supply
 *
 * The supply alias will automatically be unregistered when the source
 * device is unbound.
 */
int devm_regulator_register_supply_alias(struct device *dev, const char *id,
					 struct device *alias_dev,
					 const char *alias_id)
{
	struct regulator_supply_alias_match *match;
	int ret;

	match = devres_alloc(devm_regulator_destroy_supply_alias,
			   sizeof(struct regulator_supply_alias_match),
			   GFP_KERNEL);
	if (!match)
		return -ENOMEM;

	match->dev = dev;
	match->id = id;

	ret = regulator_register_supply_alias(dev, id, alias_dev, alias_id);
	if (ret < 0) {
		devres_free(match);
		return ret;
	}

	devres_add(dev, match);

	return 0;
}
EXPORT_SYMBOL_GPL(devm_regulator_register_supply_alias);

/**
 * devm_regulator_unregister_supply_alias - Resource managed
 * regulator_unregister_supply_alias()
 *
 * @dev: device that will be given as the regulator "consumer"
 * @id: Supply name or regulator ID
 *
 * Unregister an alias registered with
 * devm_regulator_register_supply_alias(). Normally this function
 * will not need to be called and the resource management code
 * will ensure that the resource is freed.
 */
void devm_regulator_unregister_supply_alias(struct device *dev, const char *id)
{
	struct regulator_supply_alias_match match;
	int rc;

	match.dev = dev;
	match.id = id;

	rc = devres_release(dev, devm_regulator_destroy_supply_alias,
			    devm_regulator_match_supply_alias, &match);
	if (rc != 0)
		WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_regulator_unregister_supply_alias);

/**
 * devm_regulator_bulk_register_supply_alias - Managed register
 * multiple aliases
 *
 * @dev: device that will be given as the regulator "consumer"
 * @id: List of supply names or regulator IDs
 * @alias_dev: device that should be used to lookup the supply
 * @alias_id: List of supply names or regulator IDs that should be used to
 * lookup the supply
 * @num_id: Number of aliases to register
 *
 * @return 0 on success, an errno on failure.
 *
 * This helper function allows drivers to register several supply
 * aliases in one operation, the aliases will be automatically
 * unregisters when the source device is unbound.  If any of the
 * aliases cannot be registered any aliases that were registered
 * will be removed before returning to the caller.
 */
int devm_regulator_bulk_register_supply_alias(struct device *dev,
					      const char *const *id,
					      struct device *alias_dev,
					      const char *const *alias_id,
					      int num_id)
{
	int i;
	int ret;

	for (i = 0; i < num_id; ++i) {
		ret = devm_regulator_register_supply_alias(dev, id[i],
							   alias_dev,
							   alias_id[i]);
		if (ret < 0)
			goto err;
	}

	return 0;

err:
	dev_err(dev,
		"Failed to create supply alias %s,%s -> %s,%s\n",
		id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));

	while (--i >= 0)
		devm_regulator_unregister_supply_alias(dev, id[i]);

	return ret;
}
EXPORT_SYMBOL_GPL(devm_regulator_bulk_register_supply_alias);

/**
 * devm_regulator_bulk_unregister_supply_alias - Managed unregister
 * multiple aliases
 *
 * @dev: device that will be given as the regulator "consumer"
 * @id: List of supply names or regulator IDs
 * @num_id: Number of aliases to unregister
 *
 * Unregister aliases registered with
 * devm_regulator_bulk_register_supply_alias(). Normally this function
 * will not need to be called and the resource management code
 * will ensure that the resource is freed.
 */
void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
						 const char *const *id,
						 int num_id)
{
	int i;

	for (i = 0; i < num_id; ++i)
		devm_regulator_unregister_supply_alias(dev, id[i]);
}
EXPORT_SYMBOL_GPL(devm_regulator_bulk_unregister_supply_alias);

struct regulator_notifier_match {
	struct regulator *regulator;
	struct notifier_block *nb;
};

static int devm_regulator_match_notifier(struct device *dev, void *res,
					 void *data)
{
	struct regulator_notifier_match *match = res;
	struct regulator_notifier_match *target = data;

	return match->regulator == target->regulator && match->nb == target->nb;
}

static void devm_regulator_destroy_notifier(struct device *dev, void *res)
{
	struct regulator_notifier_match *match = res;

	regulator_unregister_notifier(match->regulator, match->nb);
}

/**
 * devm_regulator_register_notifier - Resource managed
 * regulator_register_notifier
 *
 * @regulator: regulator source
 * @nb: notifier block
 *
 * The notifier will be registers under the consumer device and be
 * automatically be unregistered when the source device is unbound.
 */
int devm_regulator_register_notifier(struct regulator *regulator,
				     struct notifier_block *nb)
{
	struct regulator_notifier_match *match;
	int ret;

	match = devres_alloc(devm_regulator_destroy_notifier,
			     sizeof(struct regulator_notifier_match),
			     GFP_KERNEL);
	if (!match)
		return -ENOMEM;

	match->regulator = regulator;
	match->nb = nb;

	ret = regulator_register_notifier(regulator, nb);
	if (ret < 0) {
		devres_free(match);
		return ret;
	}

	devres_add(regulator->dev, match);

	return 0;
}
EXPORT_SYMBOL_GPL(devm_regulator_register_notifier);

/**
 * devm_regulator_unregister_notifier - Resource managed
 * regulator_unregister_notifier()
 *
 * @regulator: regulator source
 * @nb: notifier block
 *
 * Unregister a notifier registered with devm_regulator_register_notifier().
 * Normally this function will not need to be called and the resource
 * management code will ensure that the resource is freed.
 */
void devm_regulator_unregister_notifier(struct regulator *regulator,
					struct notifier_block *nb)
{
	struct regulator_notifier_match match;
	int rc;

	match.regulator = regulator;
	match.nb = nb;

	rc = devres_release(regulator->dev, devm_regulator_destroy_notifier,
			    devm_regulator_match_notifier, &match);
	if (rc != 0)
		WARN_ON(rc);
}
EXPORT_SYMBOL_GPL(devm_regulator_unregister_notifier);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
0cdfcc0f MB	2	/*
	3	* devres.c -- Voltage/Current Regulator framework devres implementation.
	4	*
	5	* Copyright 2013 Linaro Ltd
0cdfcc0f MB	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
0cdfcc0f MB	17	static void devm_regulator_release(struct device dev, void res)
	18	{
	19	regulator_put((struct regulator *)res);
	20	}
	21
	22	static 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(-ENOMEM);
	30
a8bd42a9	31	regulator = _regulator_get(dev, id, get_type);
0cdfcc0f MB	32	if (!IS_ERR(regulator)) {
	33	*ptr = regulator;
	34	devres_add(dev, ptr);
	35	} else {
	36	devres_free(ptr);
	37	}
	38
	39	return regulator;
	40	}
	41
	42	/**
	43	* devm_regulator_get - Resource managed regulator_get()
	44	* @dev: device for regulator "consumer"
	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	*/
	51	struct regulator devm_regulator_get(struct device dev, const char *id)
	52	{
	53	return _devm_regulator_get(dev, id, NORMAL_GET);
	54	}
	55	EXPORT_SYMBOL_GPL(devm_regulator_get);
	56
	57	/**
	58	* devm_regulator_get_exclusive - Resource managed regulator_get_exclusive()
	59	* @dev: device for regulator "consumer"
	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	*/
	66	struct regulator devm_regulator_get_exclusive(struct device dev,
	67	const char *id)
	68	{
	69	return _devm_regulator_get(dev, id, EXCLUSIVE_GET);
	70	}
	71	EXPORT_SYMBOL_GPL(devm_regulator_get_exclusive);
	72
	73	/**
	74	* devm_regulator_get_optional - Resource managed regulator_get_optional()
	75	* @dev: device for regulator "consumer"
	76	* @id: Supply name or regulator ID.
	77	*
	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.
	81	*/
	82	struct regulator devm_regulator_get_optional(struct device dev,
	83	const char *id)
	84	{
	85	return _devm_regulator_get(dev, id, OPTIONAL_GET);
	86	}
	87	EXPORT_SYMBOL_GPL(devm_regulator_get_optional);
	88
	89	static int devm_regulator_match(struct device dev, void res, void *data)
	90	{
	91	struct regulator **r = res;
	92	if (!r \|\| !*r) {
	93	WARN_ON(!r \|\| !*r);
	94	return 0;
	95	}
96	return *r == data;
97	}
98
99	/**
100	* devm_regulator_put - Resource managed regulator_put()
101	* @regulator: regulator to free
102	*
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.
106	*/
107	void devm_regulator_put(struct regulator *regulator)
108	{
109	int rc;
110
111	rc = devres_release(regulator->dev, devm_regulator_release,
112	devm_regulator_match, regulator);
113	if (rc != 0)
114	WARN_ON(rc);
115	}
116	EXPORT_SYMBOL_GPL(devm_regulator_put);
117
3eaeb475 DT	118	struct regulator_bulk_devres {
	119	struct regulator_bulk_data *consumers;
	120	int num_consumers;
	121	};
	122
	123	static void devm_regulator_bulk_release(struct device dev, void res)
	124	{
	125	struct regulator_bulk_devres *devres = res;
	126
	127	regulator_bulk_free(devres->num_consumers, devres->consumers);
	128	}
	129
0cdfcc0f MB	130	/**
	131	* devm_regulator_bulk_get - managed get multiple regulator consumers
	132	*
	133	* @dev: Device to supply
	134	* @num_consumers: Number of consumers to register
	135	* @consumers: Configuration of consumers; clients are stored here.
	136	*
	137	* @return 0 on success, an errno on failure.
	138	*
	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.
	144	*/
	145	int devm_regulator_bulk_get(struct device *dev, int num_consumers,
	146	struct regulator_bulk_data *consumers)
	147	{
3eaeb475	148	struct regulator_bulk_devres *devres;
0cdfcc0f MB	149	int ret;
0cdfcc0f MB	150
3eaeb475 DT	151	devres = devres_alloc(devm_regulator_bulk_release,
	152	sizeof(*devres), GFP_KERNEL);
	153	if (!devres)
	154	return -ENOMEM;
0cdfcc0f	155
3eaeb475 DT	156	ret = regulator_bulk_get(dev, num_consumers, consumers);
	157	if (!ret) {
	158	devres->consumers = consumers;
	159	devres->num_consumers = num_consumers;
	160	devres_add(dev, devres);
	161	} else {
	162	devres_free(devres);
	163	}
0cdfcc0f MB	164
	165	return ret;
	166	}
	167	EXPORT_SYMBOL_GPL(devm_regulator_bulk_get);
	168
	169	static void devm_rdev_release(struct device dev, void res)
	170	{
	171	regulator_unregister((struct regulator_dev *)res);
	172	}
	173
	174	/**
	175	* devm_regulator_register - Resource managed regulator_register()
	176	* @regulator_desc: regulator to register
	177	* @config: runtime configuration for regulator
	178	*
	179	* Called by regulator drivers to register a regulator. Returns a
	180	* valid pointer to struct regulator_dev on success or an ERR_PTR() on
	181	* error. The regulator will automatically be released when the device
	182	* is unbound.
	183	*/
	184	struct regulator_dev devm_regulator_register(struct device dev,
	185	const struct regulator_desc *regulator_desc,
	186	const struct regulator_config *config)
	187	{
	188	struct regulator_dev *ptr, rdev;
	189
	190	ptr = devres_alloc(devm_rdev_release, sizeof(*ptr),
	191	GFP_KERNEL);
	192	if (!ptr)
	193	return ERR_PTR(-ENOMEM);
	194
	195	rdev = regulator_register(regulator_desc, config);
	196	if (!IS_ERR(rdev)) {
	197	*ptr = rdev;
	198	devres_add(dev, ptr);
	199	} else {
	200	devres_free(ptr);
	201	}
	202
	203	return rdev;
	204	}
	205	EXPORT_SYMBOL_GPL(devm_regulator_register);
	206
	207	static int devm_rdev_match(struct device dev, void res, void *data)
	208	{
	209	struct regulator_dev **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_unregister - Resource managed regulator_unregister()
	219	* @regulator: regulator to free
	220	*
	221	* Unregister a regulator registered with devm_regulator_register().
	222	* Normally this function will not need to be called and the resource
	223	* management code will ensure that the resource is freed.
	224	*/
	225	void devm_regulator_unregister(struct device dev, struct regulator_dev rdev)
	226	{
	227	int rc;
228
229	rc = devres_release(dev, devm_rdev_release, devm_rdev_match, rdev);
230	if (rc != 0)
231	WARN_ON(rc);
232	}
233	EXPORT_SYMBOL_GPL(devm_regulator_unregister);
a06ccd9c CK	234
	235	struct regulator_supply_alias_match {
	236	struct device *dev;
	237	const char *id;
	238	};
	239
	240	static int devm_regulator_match_supply_alias(struct device dev, void res,
	241	void *data)
	242	{
	243	struct regulator_supply_alias_match *match = res;
	244	struct regulator_supply_alias_match *target = data;
	245
	246	return match->dev == target->dev && strcmp(match->id, target->id) == 0;
	247	}
	248
	249	static void devm_regulator_destroy_supply_alias(struct device dev, void res)
	250	{
	251	struct regulator_supply_alias_match *match = res;
	252
	253	regulator_unregister_supply_alias(match->dev, match->id);
	254	}
	255
	256	/**
	257	* devm_regulator_register_supply_alias - Resource managed
	258	* regulator_register_supply_alias()
	259	*
	260	* @dev: device that will be given as the regulator "consumer"
	261	* @id: Supply name or regulator ID
	262	* @alias_dev: device that should be used to lookup the supply
	263	* @alias_id: Supply name or regulator ID that should be used to lookup the
	264	* supply
	265	*
	266	* The supply alias will automatically be unregistered when the source
	267	* device is unbound.
	268	*/
	269	int devm_regulator_register_supply_alias(struct device dev, const char id,
	270	struct device *alias_dev,
	271	const char *alias_id)
	272	{
	273	struct regulator_supply_alias_match *match;
	274	int ret;
	275
	276	match = devres_alloc(devm_regulator_destroy_supply_alias,
	277	sizeof(struct regulator_supply_alias_match),
	278	GFP_KERNEL);
	279	if (!match)
	280	return -ENOMEM;
	281
	282	match->dev = dev;
	283	match->id = id;
	284
	285	ret = regulator_register_supply_alias(dev, id, alias_dev, alias_id);
	286	if (ret < 0) {
	287	devres_free(match);
	288	return ret;
	289	}
	290
	291	devres_add(dev, match);
	292
	293	return 0;
	294	}
	295	EXPORT_SYMBOL_GPL(devm_regulator_register_supply_alias);
	296
	297	/**
298	* devm_regulator_unregister_supply_alias - Resource managed
299	* regulator_unregister_supply_alias()
300	*
301	* @dev: device that will be given as the regulator "consumer"
302	* @id: Supply name or regulator ID
303	*
304	* Unregister an alias registered with
305	* devm_regulator_register_supply_alias(). Normally this function
306	* will not need to be called and the resource management code
307	* will ensure that the resource is freed.
308	*/
309	void devm_regulator_unregister_supply_alias(struct device dev, const char id)
310	{
311	struct regulator_supply_alias_match match;
312	int rc;
313
314	match.dev = dev;
315	match.id = id;
316
317	rc = devres_release(dev, devm_regulator_destroy_supply_alias,
318	devm_regulator_match_supply_alias, &match);
319	if (rc != 0)
320	WARN_ON(rc);
321	}
322	EXPORT_SYMBOL_GPL(devm_regulator_unregister_supply_alias);
323
324	/**
325	* devm_regulator_bulk_register_supply_alias - Managed register
326	* multiple aliases
327	*
328	* @dev: device that will be given as the regulator "consumer"
329	* @id: List of supply names or regulator IDs
330	* @alias_dev: device that should be used to lookup the supply
331	* @alias_id: List of supply names or regulator IDs that should be used to
332	* lookup the supply
333	* @num_id: Number of aliases to register
334	*
335	* @return 0 on success, an errno on failure.
336	*
337	* This helper function allows drivers to register several supply
338	* aliases in one operation, the aliases will be automatically
339	* unregisters when the source device is unbound. If any of the
340	* aliases cannot be registered any aliases that were registered
341	* will be removed before returning to the caller.
342	*/
343	int devm_regulator_bulk_register_supply_alias(struct device *dev,
9f8c0fe9	344	const char const id,
a06ccd9c	345	struct device *alias_dev,
9f8c0fe9	346	const char const alias_id,
a06ccd9c CK	347	int num_id)
	348	{
	349	int i;
	350	int ret;
	351
	352	for (i = 0; i < num_id; ++i) {
	353	ret = devm_regulator_register_supply_alias(dev, id[i],
	354	alias_dev,
	355	alias_id[i]);
	356	if (ret < 0)
	357	goto err;
	358	}
	359
	360	return 0;
	361
	362	err:
	363	dev_err(dev,
	364	"Failed to create supply alias %s,%s -> %s,%s\n",
	365	id[i], dev_name(dev), alias_id[i], dev_name(alias_dev));
	366
	367	while (--i >= 0)
	368	devm_regulator_unregister_supply_alias(dev, id[i]);
	369
	370	return ret;
	371	}
	372	EXPORT_SYMBOL_GPL(devm_regulator_bulk_register_supply_alias);
	373
	374	/**
	375	* devm_regulator_bulk_unregister_supply_alias - Managed unregister
	376	* multiple aliases
	377	*
	378	* @dev: device that will be given as the regulator "consumer"
	379	* @id: List of supply names or regulator IDs
	380	* @num_id: Number of aliases to unregister
	381	*
	382	* Unregister aliases registered with
	383	* devm_regulator_bulk_register_supply_alias(). Normally this function
	384	* will not need to be called and the resource management code
	385	* will ensure that the resource is freed.
	386	*/
	387	void devm_regulator_bulk_unregister_supply_alias(struct device *dev,
9f8c0fe9	388	const char const id,
a06ccd9c CK	389	int num_id)
	390	{
	391	int i;
	392
	393	for (i = 0; i < num_id; ++i)
	394	devm_regulator_unregister_supply_alias(dev, id[i]);
	395	}
	396	EXPORT_SYMBOL_GPL(devm_regulator_bulk_unregister_supply_alias);
046db763 CK	397
	398	struct regulator_notifier_match {
	399	struct regulator *regulator;
	400	struct notifier_block *nb;
	401	};
	402
	403	static int devm_regulator_match_notifier(struct device dev, void res,
	404	void *data)
	405	{
	406	struct regulator_notifier_match *match = res;
	407	struct regulator_notifier_match *target = data;
	408
	409	return match->regulator == target->regulator && match->nb == target->nb;
	410	}
	411
	412	static void devm_regulator_destroy_notifier(struct device dev, void res)
	413	{
	414	struct regulator_notifier_match *match = res;
	415
	416	regulator_unregister_notifier(match->regulator, match->nb);
	417	}
	418
	419	/**
	420	* devm_regulator_register_notifier - Resource managed
	421	* regulator_register_notifier
	422	*
	423	* @regulator: regulator source
	424	* @nb: notifier block
	425	*
	426	* The notifier will be registers under the consumer device and be
	427	* automatically be unregistered when the source device is unbound.
	428	*/
	429	int devm_regulator_register_notifier(struct regulator *regulator,
	430	struct notifier_block *nb)
	431	{
	432	struct regulator_notifier_match *match;
	433	int ret;
	434
	435	match = devres_alloc(devm_regulator_destroy_notifier,
	436	sizeof(struct regulator_notifier_match),
	437	GFP_KERNEL);
	438	if (!match)
	439	return -ENOMEM;
	440
	441	match->regulator = regulator;
	442	match->nb = nb;
	443
	444	ret = regulator_register_notifier(regulator, nb);
	445	if (ret < 0) {
	446	devres_free(match);
	447	return ret;
	448	}
	449
	450	devres_add(regulator->dev, match);
	451
	452	return 0;
	453	}
	454	EXPORT_SYMBOL_GPL(devm_regulator_register_notifier);
	455
	456	/**
	457	* devm_regulator_unregister_notifier - Resource managed
	458	* regulator_unregister_notifier()
	459	*
	460	* @regulator: regulator source
461	* @nb: notifier block
462	*
463	* Unregister a notifier registered with devm_regulator_register_notifier().
464	* Normally this function will not need to be called and the resource
465	* management code will ensure that the resource is freed.
466	*/
467	void devm_regulator_unregister_notifier(struct regulator *regulator,
468	struct notifier_block *nb)
469	{
470	struct regulator_notifier_match match;
471	int rc;
472
473	match.regulator = regulator;
474	match.nb = nb;
475
476	rc = devres_release(regulator->dev, devm_regulator_destroy_notifier,
477	devm_regulator_match_notifier, &match);
478	if (rc != 0)
479	WARN_ON(rc);
480	}
481	EXPORT_SYMBOL_GPL(devm_regulator_unregister_notifier);