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Commit 5b698be0 authored by Meghana Madhyastha's avatar Meghana Madhyastha Committed by Sean Paul
Browse files

video: backlight: Add helpers to enable and disable backlight 



Add helper functions backlight_enable and backlight_disable to
enable/disable a backlight device. These helper functions can
then be used by different drm and tinydrm drivers to avoid
repetition of code and also to enforce a uniform and consistent
way to enable/disable a backlight device.

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/39b5bf0a02008a8072d910bdf8231c431e9ef504.1516810725.git.meghana.madhyastha@gmail.com
parent d8a5b805

include/linux/backlight.h

+32 −0
Original line number Diff line number Diff line
@@ -130,6 +130,38 @@ static inline int backlight_update_status(struct backlight_device *bd) 
	return ret;

}



/**

 * backlight_enable - Enable backlight

 * @bd: the backlight device to enable

 */

static inline int backlight_enable(struct backlight_device *bd)

{

	if (!bd)

		return 0;



	bd->props.power = FB_BLANK_UNBLANK;

	bd->props.fb_blank = FB_BLANK_UNBLANK;

	bd->props.state &= ~BL_CORE_FBBLANK;



	return backlight_update_status(bd);

}



/**

 * backlight_disable - Disable backlight

 * @bd: the backlight device to disable

 */

static inline int backlight_disable(struct backlight_device *bd)

{

	if (!bd)

		return 0;



	bd->props.power = FB_BLANK_POWERDOWN;

	bd->props.fb_blank = FB_BLANK_POWERDOWN;

	bd->props.state |= BL_CORE_FBBLANK;



	return backlight_update_status(bd);

}



extern struct backlight_device *backlight_device_register(const char *name,

	struct device *dev, void *devdata, const struct backlight_ops *ops,

	const struct backlight_properties *props);