Commit 046db763 authored by Charles Keepax's avatar Charles Keepax Committed by Mark Brown
Browse files

regulator: core: Add devres versions of notifier registration 



Add devm_regulator_register_notifier, this adds the resource against the
device for the consumer supply we are registering the notifier for. There
seem to be few use-cases where this wouldn't be the users intention and
this ensures the notifiers will always be removed at the correct time.

Signed-off-by: default avatarCharles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent c517d838

drivers/regulator/devres.c

+85 −0
Original line number Diff line number Diff line
@@ -413,3 +413,88 @@ void devm_regulator_bulk_unregister_supply_alias(struct device *dev, 
		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);

include/linux/regulator/consumer.h

+16 −0
Original line number Diff line number Diff line
@@ -252,8 +252,12 @@ int regulator_list_hardware_vsel(struct regulator *regulator, 
/* regulator notifier block */

int regulator_register_notifier(struct regulator *regulator,

			      struct notifier_block *nb);

int devm_regulator_register_notifier(struct regulator *regulator,

				     struct notifier_block *nb);

int regulator_unregister_notifier(struct regulator *regulator,

				struct notifier_block *nb);

void devm_regulator_unregister_notifier(struct regulator *regulator,

					struct notifier_block *nb);



/* driver data - core doesn't touch */

void *regulator_get_drvdata(struct regulator *regulator);
@@ -515,12 +519,24 @@ static inline int regulator_register_notifier(struct regulator *regulator, 
	return 0;

}



static inline int devm_regulator_register_notifier(struct regulator *regulator,

						   struct notifier_block *nb)

{

	return 0;

}



static inline int regulator_unregister_notifier(struct regulator *regulator,

				struct notifier_block *nb)

{

	return 0;

}



static inline int devm_regulator_unregister_notifier(struct regulator *regulator,

						     struct notifier_block *nb)

{

	return 0;

}



static inline void *regulator_get_drvdata(struct regulator *regulator)

{

	return NULL;

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