linux-kernel - Re: [PATCH 10/10] media: uvcvideo: Populate only active control classes

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Date:   Thu, 11 Mar 2021 17:59:36 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Ricardo Ribalda <ribalda@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tomasz Figa <tfiga@...omium.org>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, senozhatsky@...omium.org
Subject: Re: [PATCH 10/10] media: uvcvideo: Populate only active control
 classes

Hi Ricardo,

On Thu, Mar 11, 2021 at 04:21:38PM +0100, Ricardo Ribalda Delgado wrote:
> On Thu, Mar 11, 2021 at 3:32 PM Hans Verkuil <hverkuil@...all.nl> wrote:
> >
> > On 11/03/2021 13:20, Ricardo Ribalda wrote:
> > > Do not create Control Classes for empty classes.
> >
> > Shouldn't this be squashed with patch 06/10?
> 
> Most of the cameras I have used have the two classes, So  I am not
> sure if squash with 6/10, or remove it. I separated it to feel what
> Laurent has to say :)

I think it makes sense to only expose the classes that are being used,
so the change is good. As it fixes a bug introduced in 06/10, I'd squash
it.

> > > Fixes v4l2-compliance:
> > >
> > > Control ioctls (Input 0):
> > >                       fail: v4l2-test-controls.cpp(255): no controls in class 009d0000
> > >       test VIDIOC_QUERY_EXT_CTRL/QUERYMENU: FAIL
> > >
> > > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> > > ---
> > >  drivers/media/usb/uvc/uvc_ctrl.c   | 11 +++++++++++
> > >  drivers/media/usb/uvc/uvc_driver.c |  1 -
> > >  drivers/media/usb/uvc/uvcvideo.h   |  1 -
> > >  3 files changed, 11 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> > > index 433342efc63f..5efbb3b5aa5b 100644
> > > --- a/drivers/media/usb/uvc/uvc_ctrl.c
> > > +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> > > @@ -2128,6 +2128,17 @@ static int __uvc_ctrl_add_mapping(struct uvc_device *dev,
> > >       if (map->set == NULL)
> > >               map->set = uvc_set_le_value;
> > >
> > > +     switch (V4L2_CTRL_ID2WHICH(map->id)) {
> > > +     case V4L2_CTRL_ID2WHICH(V4L2_CID_CAMERA_CLASS):
> > > +             dev->ctrl_class_unit->ctrl_class.bmControls[0] |=
> > > +                                             BIT(UVC_CC_CAMERA_CLASS);
> > > +             break;
> > > +     case V4L2_CTRL_ID2WHICH(V4L2_CID_USER_CLASS):
> > > +             dev->ctrl_class_unit->ctrl_class.bmControls[0] |=
> > > +                                             BIT(UVC_CC_USER_CLASS);
> > > +             break;
> > > +     }
> > > +
> > >       list_add_tail(&map->list, &ctrl->info.mappings);
> > >       uvc_dbg(dev, CONTROL, "Adding mapping '%s' to control %pUl/%u\n",
> > >               map->name, ctrl->info.entity, ctrl->info.selector);
> > > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > > index 996e8bd06ac5..4f368ab3a1f1 100644
> > > --- a/drivers/media/usb/uvc/uvc_driver.c
> > > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > > @@ -1501,7 +1501,6 @@ static int uvc_ctrl_class_parse(struct uvc_device *dev)
> > >
> > >       unit->ctrl_class.bControlSize = 1;
> > >       unit->ctrl_class.bmControls = (u8 *)unit + sizeof(*unit);
> > > -     unit->ctrl_class.bmControls[0] = (1 << (UVC_CC_LAST_CLASS + 1)) - 1;
> > >       unit->get_info = uvc_ctrl_class_get_info;
> > >       strncpy(unit->name, "Control Class", sizeof(unit->name) - 1);
> > >
> > > diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> > > index 1d59ac10c2eb..cc573d63e459 100644
> > > --- a/drivers/media/usb/uvc/uvcvideo.h
> > > +++ b/drivers/media/usb/uvc/uvcvideo.h
> > > @@ -186,7 +186,6 @@
> > >   */
> > >  #define UVC_CC_CAMERA_CLASS  0
> > >  #define UVC_CC_USER_CLASS    1
> > > -#define UVC_CC_LAST_CLASS    UVC_CC_USER_CLASS
> > >
> > >  /* ------------------------------------------------------------------------
> > >   * Driver specific constants.

-- 
Regards,

Laurent Pinchart