linux-kernel - Re: [PATCH v18 01/10] video: backlight: Add helpers to enable and disable backlight

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Message-ID: <20180123100029.fr42yezfw2rp6sss@oak.lan>
Date:   Tue, 23 Jan 2018 10:00:29 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Meghana Madhyastha <meghana.madhyastha@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Noralf Trønnes <noralf@...nnes.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Sean Paul <seanpaul@...omium.org>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v18 01/10] video: backlight: Add helpers to enable and
 disable backlight

On Mon, Jan 22, 2018 at 02:49:28PM +0000, Meghana Madhyastha wrote:
> 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@...il.com>
> ---
> Acked-by: Daniel Thompson <daniel.thompson@...aro.org>
> Reviewed-by: Noralf Trønnes <noralf@...nnes.org>
> Reviewed-by: Sean Paul<seanpaul@...omium.org>

Just in case there's another spin...  the additional tags are normally 
presented above the --- (otherwise they are unlikely to be copied into 
the git history when they are applied).


Daniel.


> 
>  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
>