linux-kernel - Re: [PATCH v7 3/8] media: uvcvideo: Support minimum for V4L2_CTRL_TYPE

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Message-ID: <YqyGfFK3UXhrBLwK@pendragon.ideasonboard.com>
Date:   Fri, 17 Jun 2022 16:49:48 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        tfiga@...omium.org, senozhatsky@...omium.org, yunkec@...gle.com
Subject: Re: [PATCH v7 3/8] media: uvcvideo: Support minimum for
 V4L2_CTRL_TYPE_MENU

Hi Ricardo,

Thank you for the patch.

On Fri, Jun 17, 2022 at 12:36:40PM +0200, Ricardo Ribalda wrote:
> Currently all mappings of type V4L2_CTRL_TYPE_MENU, have a minimum of 0,
> but there are some controls (limited powerline), that start with a value
> different than 0.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  drivers/media/usb/uvc/uvc_ctrl.c | 5 +++--
>  drivers/media/usb/uvc/uvcvideo.h | 1 +
>  2 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index 092decfdaa62..3b20b23abd1e 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -1144,7 +1144,7 @@ static int __uvc_query_v4l2_ctrl(struct uvc_video_chain *chain,
>  
>  	switch (mapping->v4l2_type) {
>  	case V4L2_CTRL_TYPE_MENU:
> -		v4l2_ctrl->minimum = 0;
> +		v4l2_ctrl->minimum = mapping->menu_min;
>  		v4l2_ctrl->maximum = mapping->menu_count - 1;
>  		v4l2_ctrl->step = 1;
>  
> @@ -1264,7 +1264,8 @@ int uvc_query_v4l2_menu(struct uvc_video_chain *chain,
>  		goto done;
>  	}
>  
> -	if (query_menu->index >= mapping->menu_count) {
> +	if (query_menu->index < mapping->menu_min ||
> +	    query_menu->index >= mapping->menu_count) {
>  		ret = -EINVAL;
>  		goto done;
>  	}
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index fff5c5c99a3d..6ceb7f7b964d 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -254,6 +254,7 @@ struct uvc_control_mapping {
>  	u32 data_type;
>  
>  	const struct uvc_menu_info *menu_info;
> +	u32 menu_min;
>  	u32 menu_count;

That's a bit of a stop-gap measure, could we turn it into a bitmask
instead ?

>  
>  	u32 master_id;

-- 
Regards,

Laurent Pinchart