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extcon: Add extcon_dev_allocate/free() to control the memory of extcon device

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This patch add APIs to control the extcon device on extcon provider driver.
The extcon_dev_allocate() allocates the memory of extcon device and initializes
supported cables. And then extcon_dev_free() decrement the reference of the
device of extcon device and free the memory of the extcon device. This APIs
must need to implement devm_extcon_dev_allocate()/free() APIs.

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Chanwoo Choi 2014-04-24 19:46:49 +09:00
parent d88cc36704
commit a9af65223b
2 changed files with 49 additions and 0 deletions
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36
drivers/extcon/extcon-class.c
View file

@ -565,6 +565,42 @@ static void dummy_sysfs_dev_release(struct device *dev)
{ {
} }
/*
* extcon_dev_allocate() - Allocate the memory of extcon device.
* @supported_cable: Array of supported cable names ending with NULL.
* If supported_cable is NULL, cable name related APIs
* are disabled.
*
* This function allocates the memory for extcon device without allocating
* memory in each extcon provider driver and initialize default setting for
* extcon device.
*
* Return the pointer of extcon device if success or ERR_PTR(err) if fail
*/
struct extcon_dev *extcon_dev_allocate(const char **supported_cable)
{
struct extcon_dev *edev;
edev = kzalloc(sizeof(*edev), GFP_KERNEL);
if (!edev)
return ERR_PTR(-ENOMEM);
edev->max_supported = 0;
edev->supported_cable = supported_cable;
return edev;
}
/*
* extcon_dev_free() - Free the memory of extcon device.
* @edev: the extcon device to free
*/
void extcon_dev_free(struct extcon_dev *edev)
{
kfree(edev);
}
EXPORT_SYMBOL_GPL(extcon_dev_free);
/** /**
* extcon_dev_register() - Register a new extcon device * extcon_dev_register() - Register a new extcon device
* @edev : the new extcon device (should be allocated before calling) * @edev : the new extcon device (should be allocated before calling)

13
include/linux/extcon.h
View file

@ -191,6 +191,12 @@ extern void devm_extcon_dev_unregister(struct device *dev,
struct extcon_dev *edev); struct extcon_dev *edev);
extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name); extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
/*
* Following APIs control the memory of extcon device.
*/
extern struct extcon_dev *extcon_dev_allocate(const char **cables);
extern void extcon_dev_free(struct extcon_dev *edev);
/* /*
* get/set/update_state access the 32b encoded state value, which represents * get/set/update_state access the 32b encoded state value, which represents
* states of all possible cables of the multistate port. For example, if one * states of all possible cables of the multistate port. For example, if one
@ -267,6 +273,13 @@ static inline int devm_extcon_dev_register(struct device *dev,
static inline void devm_extcon_dev_unregister(struct device *dev, static inline void devm_extcon_dev_unregister(struct device *dev,
struct extcon_dev *edev) { } struct extcon_dev *edev) { }
static inline struct extcon_dev *extcon_dev_allocate(const char **cables)
{
return ERR_PTR(-ENOSYS);
}
static inline void extcon_dev_free(struct extcon_dev *edev) { }
static inline u32 extcon_get_state(struct extcon_dev *edev) static inline u32 extcon_get_state(struct extcon_dev *edev)
{ {
return 0; return 0;