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Date: Sat, 13 Mar 2021 01:28:55 +0200
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc: 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>,
Sergey Senozhatsky <senozhatsky@...omium.org>,
Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [PATCH v3 7/8] media: uvcvideo: Set a different name for the
metadata entity
Hi Ricardo,
On Sat, Mar 13, 2021 at 12:17:50AM +0100, Ricardo Ribalda Delgado wrote:
> On Fri, Mar 12, 2021 at 11:30 PM Laurent Pinchart wrote:
> > On Fri, Mar 12, 2021 at 01:48:29PM +0100, Ricardo Ribalda wrote:
> > > All the entities must have a unique name. And now that we are at it, we
> > > append the entity->id to the name to avoid collisions on multi-chain
> > > devices.
> > >
> > > Fixes v4l2-compliance:
> > > Media Controller ioctls:
> > > fail: v4l2-test-media.cpp(205): v2_entity_names_set.find(key) != v2_entity_names_set.end()
> > > test MEDIA_IOC_G_TOPOLOGY: FAIL
> > > fail: v4l2-test-media.cpp(394): num_data_links != num_links
> > > test MEDIA_IOC_ENUM_ENTITIES/LINKS: FAIL
> > >
> > > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> > > ---
> > > drivers/media/usb/uvc/uvc_driver.c | 21 ++++++++++++++++++++-
> > > 1 file changed, 20 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > > index 35873cf2773d..6c928e708615 100644
> > > --- a/drivers/media/usb/uvc/uvc_driver.c
> > > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > > @@ -2154,6 +2154,18 @@ static void uvc_unregister_video(struct uvc_device *dev)
> > > #endif
> > > }
> > >
> > > +static int uvc_oterm_id(struct uvc_video_chain *chain)
> > > +{
> > > + struct uvc_entity *entity;
> > > +
> > > + list_for_each_entry(entity, &chain->entities, chain) {
> > > + if (UVC_ENTITY_IS_OTERM(entity))
> > > + return entity->id;
> >
> > It can also be an ITERM for output devices. You can drop this function
> > and use stream>header.bTerminalLink below (see uvc_stream_by_id() and
> > its usage in uvc_register_terms()).
> >
> > > + }
> > > +
> > > + return -1;
> > > +}
> > > +
> > > int uvc_register_video_device(struct uvc_device *dev,
> > > struct uvc_streaming *stream,
> > > struct video_device *vdev,
> > > @@ -2162,6 +2174,8 @@ int uvc_register_video_device(struct uvc_device *dev,
> > > const struct v4l2_file_operations *fops,
> > > const struct v4l2_ioctl_ops *ioctl_ops)
> > > {
> > > + char prefix[sizeof(vdev->name) - 9];
> > > + const char *suffix;
> > > int ret;
> > >
> > > /* Initialize the video buffers queue. */
> > > @@ -2190,16 +2204,21 @@ int uvc_register_video_device(struct uvc_device *dev,
> > > case V4L2_BUF_TYPE_VIDEO_CAPTURE:
> > > default:
> > > vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> > > + suffix = "video";
> > > break;
> > > case V4L2_BUF_TYPE_VIDEO_OUTPUT:
> > > vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
> > > + suffix = "out";
> >
> > I wonder if these two should be video-cap and video-out (or vid-cap and
> > vid-out if you want to shorten them) ?
> >
> > > break;
> > > case V4L2_BUF_TYPE_META_CAPTURE:
> > > vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
> > > + suffix = "meta";
> > > break;
> > > }
> > >
> > > - strscpy(vdev->name, dev->name, sizeof(vdev->name));
> > > + strscpy(prefix, dev->name, sizeof(prefix));
> > > + snprintf(vdev->name, sizeof(vdev->name), "%s-%d %s", prefix,
> >
> > The unit ID is never negative, so %u ?
> >
> > > + uvc_oterm_id(stream->chain), suffix);
> >
> > Truncating the device name at the beginning of the video node name isn't
> > very nice :-S How about the following ?
> >
> > snprintf(vdev->name, sizeof(vdev->name), "%s-%u (%s)", type_name,
> > uvc_oterm_id(stream->chain), dev->name);
> >
> > with the suffix variable renamed to type_name ?
> >
> > Thinking some more about it, vdev->name serves two purposes in the
> > driver: creating the entity name, and reporting the card name in
> > querycap. The former is done in the V4L2 core, which uses vdev->name
> > as-is. In this context, we con't need to add dev->name, it would be
> > redundant as the media controller device already reports it. The latter
> > is done in uvc_ioctl_querycap(). How about dropping dev->name from
> > vdev->name, and modifying uvc_ioctl_querycap() to use dev->name instead
> > of cap->card ?
> >
>
> Something like ?
> https://git.kernel.org/pub/scm/linux/kernel/git/ribalda/linux.git/commit/?h=uvc-compliance-v4&id=d4f7363455837116268152c96bf4b78d9761ad1e
I would have moved the sprintf() after the switch/case, but otherwise
it's the idea.
> https://git.kernel.org/pub/scm/linux/kernel/git/ribalda/linux.git/commit/?h=uvc-compliance-v4&id=ee3916f12b30f56c03d5622ba8a599b9c610a055
Looks good.
> I need to work on the V4L2_CTRL_FLAG_GRABBED issue and then I will
> send the whole v4 series that can pass all the v4l2-compliance test :)
>
> > >
> > > /*
> > > * Set the driver data before calling video_register_device, otherwise
--
Regards,
Laurent Pinchart
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