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    Subject[PATCH v18 01/10] 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.

    Signed-off-by: Meghana Madhyastha <meghana.madhyastha@gmail.com>
    ---
    Acked-by: Daniel Thompson <daniel.thompson@linaro.org>
    Reviewed-by: Noralf Trønnes <noralf@tronnes.org>
    Reviewed-by: Sean Paul<seanpaul@chromium.org>

    include/linux/backlight.h | 32 ++++++++++++++++++++++++++++++++
    1 file changed, 32 insertions(+)

    diff --git a/include/linux/backlight.h b/include/linux/backlight.h
    index af7003548..ace825e2c 100644
    --- a/include/linux/backlight.h
    +++ b/include/linux/backlight.h
    @@ -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);
    --
    2.11.0
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