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PM / devfreq: Add resource-managed function for devfreq device

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This patch add resource-managed function for devfreq device as following
functions. The devm_devfreq_add_device() manages automatically the memory
of devfreq device using device resource management.
- devm_devfreq_add_device()
- devm_devfreq_remove_device()

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
This commit is contained in:
Chanwoo Choi 2014-05-09 16:43:08 +09:00 committed by MyungJoo Ham
parent 585fc83ece
commit 8cd84092d3
2 changed files with 83 additions and 1 deletions
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63
drivers/devfreq/devfreq.c
View File

@ -544,6 +544,69 @@ int devfreq_remove_device(struct devfreq *devfreq)
}
EXPORT_SYMBOL(devfreq_remove_device);
static int devm_devfreq_dev_match(struct device *dev, void *res, void *data)
{
struct devfreq **r = res;
if (WARN_ON(!r || !*r))
return 0;
return *r == data;
}
static void devm_devfreq_dev_release(struct device *dev, void *res)
{
devfreq_remove_device(*(struct devfreq **)res);
}
/**
* devm_devfreq_add_device() - Resource-managed devfreq_add_device()
* @dev: the device to add devfreq feature.
* @profile: device-specific profile to run devfreq.
* @governor_name: name of the policy to choose frequency.
* @data: private data for the governor. The devfreq framework does not
* touch this value.
*
* This function manages automatically the memory of devfreq device using device
* resource management and simplify the free operation for memory of devfreq
* device.
*/
struct devfreq *devm_devfreq_add_device(struct device *dev,
struct devfreq_dev_profile *profile,
const char *governor_name,
void *data)
{
struct devfreq **ptr, *devfreq;
ptr = devres_alloc(devm_devfreq_dev_release, sizeof(*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
devfreq = devfreq_add_device(dev, profile, governor_name, data);
if (IS_ERR(devfreq)) {
devres_free(ptr);
return ERR_PTR(-ENOMEM);
}
*ptr = devfreq;
devres_add(dev, ptr);
return devfreq;
}
EXPORT_SYMBOL(devm_devfreq_add_device);
/**
* devm_devfreq_remove_device() - Resource-managed devfreq_remove_device()
* @dev: the device to add devfreq feature.
* @devfreq: the devfreq instance to be removed
*/
void devm_devfreq_remove_device(struct device *dev, struct devfreq *devfreq)
{
WARN_ON(devres_release(dev, devm_devfreq_dev_release,
devm_devfreq_dev_match, devfreq));
}
EXPORT_SYMBOL(devm_devfreq_remove_device);
/**
* devfreq_suspend_device() - Suspend devfreq of a device.
* @devfreq: the devfreq instance to be suspended

21
include/linux/devfreq.h
View File

@ -181,6 +181,12 @@ extern struct devfreq *devfreq_add_device(struct device *dev,
const char *governor_name,
void *data);
extern int devfreq_remove_device(struct devfreq *devfreq);
extern struct devfreq *devm_devfreq_add_device(struct device *dev,
struct devfreq_dev_profile *profile,
const char *governor_name,
void *data);
extern void devm_devfreq_remove_device(struct device *dev,
struct devfreq *devfreq);
/* Supposed to be called by PM_SLEEP/PM_RUNTIME callbacks */
extern int devfreq_suspend_device(struct devfreq *devfreq);
@ -220,7 +226,7 @@ static inline struct devfreq *devfreq_add_device(struct device *dev,
const char *governor_name,
void *data)
{
return NULL;
return ERR_PTR(-ENOSYS);
}
static inline int devfreq_remove_device(struct devfreq *devfreq)
@ -228,6 +234,19 @@ static inline int devfreq_remove_device(struct devfreq *devfreq)
return 0;
}
static inline struct devfreq *devm_devfreq_add_device(struct device *dev,
struct devfreq_dev_profile *profile,
const char *governor_name,
void *data)
{
return ERR_PTR(-ENOSYS);
}
static inline void devm_devfreq_remove_device(struct device *dev,
struct devfreq *devfreq)
{
}
static inline int devfreq_suspend_device(struct devfreq *devfreq)
{
return 0;