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extcon: Add resource-managed functions to register extcon notifier

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This patch adds the resource-managed functions for register/unregister
the extcon notifier with the id of each external connector. This function
will make it easy to handle the extcon notifier.

- int devm_extcon_register_notifier(struct device *dev,
				struct extcon_dev *edev, unsigned int id,
				struct notifier_block *nb);
- void devm_extcon_unregister_notifier(struct device *dev,
				struct extcon_dev *edev, unsigned int id,
				struct notifier_block *nb);

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Chanwoo Choi 2016-06-27 20:03:39 +09:00
parent b225d00f3a
commit 58f386560a
2 changed files with 90 additions and 0 deletions
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73
drivers/extcon/devres.c
View File

@ -37,6 +37,19 @@ static void devm_extcon_dev_unreg(struct device *dev, void *res)
extcon_dev_unregister(*(struct extcon_dev **)res);
}
struct extcon_dev_notifier_devres {
struct extcon_dev *edev;
unsigned int id;
struct notifier_block *nb;
};
static void devm_extcon_dev_notifier_unreg(struct device *dev, void *res)
{
struct extcon_dev_notifier_devres *this = res;
extcon_unregister_notifier(this->edev, this->id, this->nb);
}
/**
* devm_extcon_dev_allocate - Allocate managed extcon device
* @dev: device owning the extcon device being created
@ -141,3 +154,63 @@ void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
devm_extcon_dev_match, edev));
}
EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
/**
* devm_extcon_register_notifier() - Resource-managed extcon_register_notifier()
* @dev: device to allocate extcon device
* @edev: the extcon device that has the external connecotr.
* @id: the unique id of each external connector in extcon enumeration.
* @nb: a notifier block to be registered.
*
* This function manages automatically the notifier of extcon device using
* device resource management and simplify the control of unregistering
* the notifier of extcon device.
*
* Note that the second parameter given to the callback of nb (val) is
* "old_state", not the current state. The current state can be retrieved
* by looking at the third pameter (edev pointer)'s state value.
*
* Returns 0 if success or negaive error number if failure.
*/
int devm_extcon_register_notifier(struct device *dev, struct extcon_dev *edev,
unsigned int id, struct notifier_block *nb)
{
struct extcon_dev_notifier_devres *ptr;
int ret;
ptr = devres_alloc(devm_extcon_dev_notifier_unreg, sizeof(*ptr),
GFP_KERNEL);
if (!ptr)
return -ENOMEM;
ret = extcon_register_notifier(edev, id, nb);
if (ret) {
devres_free(ptr);
return ret;
}
ptr->edev = edev;
ptr->id = id;
ptr->nb = nb;
devres_add(dev, ptr);
return 0;
}
EXPORT_SYMBOL(devm_extcon_register_notifier);
/**
* devm_extcon_unregister_notifier()
- Resource-managed extcon_unregister_notifier()
* @dev: device to allocate extcon device
* @edev: the extcon device that has the external connecotr.
* @id: the unique id of each external connector in extcon enumeration.
* @nb: a notifier block to be registered.
*/
void devm_extcon_unregister_notifier(struct device *dev,
struct extcon_dev *edev, unsigned int id,
struct notifier_block *nb)
{
WARN_ON(devres_release(dev, devm_extcon_dev_notifier_unreg,
devm_extcon_dev_match, edev));
}
EXPORT_SYMBOL(devm_extcon_unregister_notifier);

17
include/linux/extcon.h
View File

@ -182,6 +182,12 @@ extern int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
struct notifier_block *nb);
extern int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
struct notifier_block *nb);
extern int devm_extcon_register_notifier(struct device *dev,
struct extcon_dev *edev, unsigned int id,
struct notifier_block *nb);
extern void devm_extcon_unregister_notifier(struct device *dev,
struct extcon_dev *edev, unsigned int id,
struct notifier_block *nb);
/*
* Following API get the extcon device from devicetree.
@ -273,6 +279,17 @@ static inline int extcon_unregister_notifier(struct extcon_dev *edev,
return 0;
}
static inline int devm_extcon_register_notifier(struct device *dev,
struct extcon_dev *edev, unsigned int id,
struct notifier_block *nb)
{
return -ENOSYS;
}
static inline void devm_extcon_unregister_notifier(struct device *dev,
struct extcon_dev *edev, unsigned int id,
struct notifier_block *nb) { }
static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
int index)
{