linux-kernel - Re: [PATCH v3 1/9] media: subdev: Add privacy led helpers

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Date: Thu, 11 Apr 2024 10:13:12 +0530
From: Umang Jain <umang.jain@...asonboard.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Hans Verkuil
 <hverkuil@...all.nl>, Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/9] media: subdev: Add privacy led helpers

Hi Tomi,

Thank you for the patch.

On 10/04/24 6:05 pm, Tomi Valkeinen wrote:
> Add helper functions to enable and disable the privacy led. This moves
> the #if from the call site to the privacy led functions, and makes
> adding privacy led support to v4l2_subdev_enable/disable_streams()
> cleaner.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>

Reviewed-by: Umang Jain <umang.jain@...asonboard.com>

> ---
>   drivers/media/v4l2-core/v4l2-subdev.c | 30 +++++++++++++++++++++---------
>   1 file changed, 21 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index 012b757eac9f..13957543d153 100644
> --- a/drivers/media/v4l2-core/v4l2-subdev.c
> +++ b/drivers/media/v4l2-core/v4l2-subdev.c
> @@ -148,6 +148,23 @@ static int subdev_close(struct file *file)
>   }
>   #endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
>   
> +static void v4l2_subdev_enable_privacy_led(struct v4l2_subdev *sd)
> +{
> +#if IS_REACHABLE(CONFIG_LEDS_CLASS)
> +	if (!IS_ERR_OR_NULL(sd->privacy_led))
> +		led_set_brightness(sd->privacy_led,
> +				   sd->privacy_led->max_brightness);
> +#endif
> +}
> +
> +static void v4l2_subdev_disable_privacy_led(struct v4l2_subdev *sd)
> +{
> +#if IS_REACHABLE(CONFIG_LEDS_CLASS)
> +	if (!IS_ERR_OR_NULL(sd->privacy_led))
> +		led_set_brightness(sd->privacy_led, 0);
> +#endif
> +}
> +
>   static inline int check_which(u32 which)
>   {
>   	if (which != V4L2_SUBDEV_FORMAT_TRY &&
> @@ -422,15 +439,10 @@ static int call_s_stream(struct v4l2_subdev *sd, int enable)
>   	if (!ret) {
>   		sd->enabled_streams = enable ? BIT(0) : 0;
>   
> -#if IS_REACHABLE(CONFIG_LEDS_CLASS)
> -		if (!IS_ERR_OR_NULL(sd->privacy_led)) {
> -			if (enable)
> -				led_set_brightness(sd->privacy_led,
> -						   sd->privacy_led->max_brightness);
> -			else
> -				led_set_brightness(sd->privacy_led, 0);
> -		}
> -#endif
> +		if (enable)
> +			v4l2_subdev_enable_privacy_led(sd);
> +		else
> +			v4l2_subdev_disable_privacy_led(sd);
>   	}
>   
>   	return ret;
>