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Commit 2e4ef334 authored by Meghana Madhyastha's avatar Meghana Madhyastha Committed by Sean Paul
Browse files

video: backlight: Add devres versions of of_find_backlight 



Add devm_of_find_backlight and the corresponding release
function because some drivers use devres versions of functions
for acquiring device resources.

Acked-by: default avatarDaniel Thompson <daniel.thompson@linaro.org>
Reviewed-by: default avatarNoralf Trønnes <noralf@tronnes.org>
Reviewed-by: default avatarSean Paul <seanpaul@chromium.org>
Signed-off-by: default avatarMeghana Madhyastha <meghana.madhyastha@gmail.com>
Signed-off-by: default avatarSean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/021f8fecfa3f374dc5dcb70fb07a6f6b019bea7b.1516810725.git.meghana.madhyastha@gmail.com
parent c2adda27

drivers/video/backlight/backlight.c

+30 −0
Original line number Diff line number Diff line
@@ -623,6 +623,36 @@ struct backlight_device *of_find_backlight(struct device *dev) 
}

EXPORT_SYMBOL(of_find_backlight);



static void devm_backlight_release(void *data)

{

	backlight_put(data);

}



/**

 * devm_of_find_backlight - Resource-managed of_find_backlight()

 * @dev: Device

 *

 * Device managed version of of_find_backlight().

 * The reference on the backlight device is automatically

 * dropped on driver detach.

 */

struct backlight_device *devm_of_find_backlight(struct device *dev)

{

	struct backlight_device *bd;

	int ret;



	bd = of_find_backlight(dev);

	if (IS_ERR_OR_NULL(bd))

		return bd;

	ret = devm_add_action(dev, devm_backlight_release, bd);

	if (ret) {

		backlight_put(bd);

		return ERR_PTR(ret);

	}

	return bd;

}

EXPORT_SYMBOL(devm_of_find_backlight);



static void __exit backlight_class_exit(void)

{

	class_destroy(backlight_class);

include/linux/backlight.h

+7 −0
Original line number Diff line number Diff line
@@ -217,11 +217,18 @@ of_find_backlight_by_node(struct device_node *node) 


#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE)

struct backlight_device *of_find_backlight(struct device *dev);

struct backlight_device *devm_of_find_backlight(struct device *dev);

#else

static inline struct backlight_device *of_find_backlight(struct device *dev)

{

	return NULL;

}



static inline struct backlight_device *

devm_of_find_backlight(struct device *dev)

{

	return NULL;

}

#endif



#endif