linux-kernel - Re: [PATCH v2 1/9] media: subdev: Add privacy led helpers

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Message-ID: <ZhZW1hiv9X7JCQ7O@kekkonen.localdomain>
Date: Wed, 10 Apr 2024 09:07:34 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
	Hans Verkuil <hverkuil@...all.nl>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Umang Jain <umang.jain@...asonboard.com>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
	hdegoede@...hat.com
Subject: Re: [PATCH v2 1/9] media: subdev: Add privacy led helpers

Moi,

On Fri, Apr 05, 2024 at 12:14:19PM +0300, 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>
> ---
>  drivers/media/v4l2-core/v4l2-subdev.c | 31 ++++++++++++++++++++++---------
>  1 file changed, 22 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
> index 4c6198c48dd6..942c7a644033 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 &&
> @@ -412,15 +429,11 @@ static int call_s_stream(struct v4l2_subdev *sd, int enable)
>  	if (WARN_ON(!!sd->enabled_streams == !!enable))
>  		return 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);
> +
>  	ret = sd->ops->video->s_stream(sd, enable);

I see that you're only making changes before the s_stream call which also
reveals a bug here: if streaming on fails, the LED will remain lit. It
should be fixed before this set.

I cc'd Hans de Goede.

>  
>  	if (!enable && ret < 0) {
> 

-- 
Kind regards,

Sakari Ailus