linux-kernel - Re: [PATCH v15 18/19] media: uvcvideo: implement UVC v1.5 ROI

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Message-ID: <CANiDSCuZTYDsQ3yCpFV_rhbQ+vFGJnsuU-jXwOacxZVbbzEPfw@mail.gmail.com>
Date: Thu, 14 Nov 2024 21:03:07 +0100
From: Ricardo Ribalda <ribalda@...omium.org>
To: Gergo Koteles <soyer@....hu>
Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
	Mauro Carvalho Chehab <mchehab@...nel.org>, Hans de Goede <hdegoede@...hat.com>, 
	Ricardo Ribalda <ribalda@...nel.org>, Sakari Ailus <sakari.ailus@...ux.intel.com>, 
	Hans Verkuil <hverkuil@...all.nl>, Yunke Cao <yunkec@...omium.org>, linux-media@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Yunke Cao <yunkec@...gle.com>
Subject: Re: [PATCH v15 18/19] media: uvcvideo: implement UVC v1.5 ROI

Hi Gergo

Sorry, I forgot to reply to your comment in v14.

On Thu, 14 Nov 2024 at 20:53, Gergo Koteles <soyer@....hu> wrote:
>
> Hi Ricardo,
>
> On Thu, 2024-11-14 at 19:10 +0000, Ricardo Ribalda wrote:
> >
> > +     },
> > +     {
> > +             .id             = V4L2_CID_UVC_REGION_OF_INTEREST_AUTO,
> > +             .entity         = UVC_GUID_UVC_CAMERA,
> > +             .selector       = UVC_CT_REGION_OF_INTEREST_CONTROL,
> > +             .size           = 16,
> > +             .offset         = 64,
> > +             .v4l2_type      = V4L2_CTRL_TYPE_BITMASK,
> > +             .data_type      = UVC_CTRL_DATA_TYPE_BITMASK,
> > +             .name           = "Region Of Interest Auto Controls",
> > +     },
> >  };
> >
>
> Wouldn't be better to use 8 V4L2_CTRL_TYPE_BOOLEAN controls for this?

If I create 8 Booleans, they will always be shown in the device. And
the user will not have a way to know which values are available and
which are not.

We will also fail the v4l2-compliance test, because there will be up
to 7 boolean controls that will not be able to be set to 1, eventhough
they are writable.

Thanks for the prompt review.
>
> Thanks,
> Gergo
>



--
Ricardo Ribalda