backlight: backlight: Introduce backlight_get_brightness() (2144d00e) · Commits · 戴 / test

Based on an idea from Emil Velikov, add a helper that checks backlight_is_blank() and return 0 as brightness if display is blank or the property value if not. This allows us to simplify the update_status() implementation in most of the backlight drivers. Signed-off-by:

Sam Ravnborg <sam@ravnborg.org> Reviewed-by:

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

Lee Jones <lee.jones@linaro.org>

include/linux/backlight.h

+19 −0

Original line number	Diff line number	Diff line
		@@ -417,6 +417,25 @@ static inline bool backlight_is_blank(const struct backlight_device *bd)
		bd->props.state & (BL_CORE_SUSPENDED \| BL_CORE_FBBLANK);
		}

		/**
		* backlight_get_brightness - Returns the current brightness value
		* @bd: the backlight device
		*
		* Returns the current brightness value, taking in consideration the current
		* state. If backlight_is_blank() returns true then return 0 as brightness
		* otherwise return the current brightness property value.
		*
		* Backlight drivers are expected to use this function in their update_status()
		* operation to get the brightness value.
		*/
		static inline int backlight_get_brightness(const struct backlight_device *bd)
		{
		if (backlight_is_blank(bd))
		return 0;
		else
		return bd->props.brightness;
		}

		struct backlight_device *
		backlight_device_register(const char name, struct device dev, void *devdata,
		const struct backlight_ops *ops,

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