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Commit a9af6522 authored by Chanwoo Choi's avatar Chanwoo Choi
Browse files

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



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: default avatarChanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: default avatarFelipe Balbi <balbi@ti.com>
parent d88cc367

drivers/extcon/extcon-class.c

+36 −0
Original line number Diff line number Diff line
@@ -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

 * @edev	: the new extcon device (should be allocated before calling)

include/linux/extcon.h

+13 −0
Original line number Diff line number Diff line
@@ -191,6 +191,12 @@ extern void devm_extcon_dev_unregister(struct device *dev, 
				       struct extcon_dev *edev);

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

 * 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,

					      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)

{

	return 0;