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Commit d5b040d0 authored by Chanwoo Choi's avatar Chanwoo Choi Committed by MyungJoo Ham
Browse files

PM / devfreq: Add devm_devfreq_{register,unregister}_opp_notfier function 



This patch add resource-managed function for devfreq opp as following
functions. The devm_devfreq_register_opp_notifier() manages automatically
the registration of devfreq opp using device resource management.
- devm_devfreq_register_opp_notifier
- devm_devfreq_unregister_opp_notifier()

Signed-off-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: default avatarMyungJoo Ham <myungjoo.ham@samsung.com>
parent 8cd84092

drivers/devfreq/devfreq.c

+48 −0
Original line number Diff line number Diff line
@@ -1169,6 +1169,54 @@ int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq) 
	return ret;

}



static void devm_devfreq_opp_release(struct device *dev, void *res)

{

	devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res);

}



/**

 * devm_ devfreq_register_opp_notifier()

 *		- Resource-managed devfreq_register_opp_notifier()

 * @dev:	The devfreq user device. (parent of devfreq)

 * @devfreq:	The devfreq object.

 */

int devm_devfreq_register_opp_notifier(struct device *dev,

				       struct devfreq *devfreq)

{

	struct devfreq **ptr;

	int ret;



	ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL);

	if (!ptr)

		return -ENOMEM;



	ret = devfreq_register_opp_notifier(dev, devfreq);

	if (ret) {

		devres_free(ptr);

		return ret;

	}



	*ptr = devfreq;

	devres_add(dev, ptr);



	return 0;

}

EXPORT_SYMBOL(devm_devfreq_register_opp_notifier);



/**

 * devm_devfreq_unregister_opp_notifier()

 *		- Resource-managed devfreq_unregister_opp_notifier()

 * @dev:	The devfreq user device. (parent of devfreq)

 * @devfreq:	The devfreq object.

 */

void devm_devfreq_unregister_opp_notifier(struct device *dev,

					 struct devfreq *devfreq)

{

	WARN_ON(devres_release(dev, devm_devfreq_opp_release,

			       devm_devfreq_dev_match, devfreq));

}

EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier);



MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");

MODULE_DESCRIPTION("devfreq class support");

MODULE_LICENSE("GPL");

include/linux/devfreq.h

+14 −0
Original line number Diff line number Diff line
@@ -199,6 +199,10 @@ extern int devfreq_register_opp_notifier(struct device *dev, 
					 struct devfreq *devfreq);

extern int devfreq_unregister_opp_notifier(struct device *dev,

					   struct devfreq *devfreq);

extern int devm_devfreq_register_opp_notifier(struct device *dev,

					      struct devfreq *devfreq);

extern void devm_devfreq_unregister_opp_notifier(struct device *dev,

						struct devfreq *devfreq);



#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)

/**
@@ -275,6 +279,16 @@ static inline int devfreq_unregister_opp_notifier(struct device *dev, 
	return -EINVAL;

}



static inline int devm_devfreq_register_opp_notifier(struct device *dev,

						     struct devfreq *devfreq)

{

	return -EINVAL;

}



static inline void devm_devfreq_unregister_opp_notifier(struct device *dev,

							struct devfreq *devfreq)

{

}

#endif /* CONFIG_PM_DEVFREQ */



#endif /* __LINUX_DEVFREQ_H__ */