drivers/regulator/devres.c - linux/kernel/git/viro/vfs - Git at Google

 // 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);
	// 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);