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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: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
hifive-unleashed-5.1
Chanwoo Choi 2014-05-09 16:43:09 +09:00 committed by MyungJoo Ham
parent 8cd84092d3
commit d5b040d0ca
2 changed files with 62 additions and 0 deletions
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48
drivers/devfreq/devfreq.c
View File

@ -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");

14
include/linux/devfreq.h
View File

@ -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__ */