video: backlight: Add helpers to enable and disable backlight (5b698be0) · Commits · 戴 / test

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:

Daniel Thompson <daniel.thompson@linaro.org> Reviewed-by:

Noralf Trønnes <noralf@tronnes.org> Reviewed-by:

Sean Paul <seanpaul@chromium.org> Signed-off-by:

Meghana Madhyastha <meghana.madhyastha@gmail.com> Signed-off-by:

Sean Paul <seanpaul@chromium.org> Link: https://patchwork.freedesktop.org/patch/msgid/39b5bf0a02008a8072d910bdf8231c431e9ef504.1516810725.git.meghana.madhyastha@gmail.com

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);

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