backlight: backlight: Introduce backlight_get_brightness()
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>
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@ -417,6 +417,25 @@ static inline bool backlight_is_blank(const struct backlight_device *bd)
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bd->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK);
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}
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/**
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* backlight_get_brightness - Returns the current brightness value
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* @bd: the backlight device
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*
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* Returns the current brightness value, taking in consideration the current
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* state. If backlight_is_blank() returns true then return 0 as brightness
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* otherwise return the current brightness property value.
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*
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* Backlight drivers are expected to use this function in their update_status()
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* operation to get the brightness value.
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*/
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static inline int backlight_get_brightness(const struct backlight_device *bd)
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{
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if (backlight_is_blank(bd))
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return 0;
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else
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return bd->props.brightness;
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}
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struct backlight_device *
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backlight_device_register(const char *name, struct device *dev, void *devdata,
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const struct backlight_ops *ops,
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