Re: [RESEND v7 0/4] usb: gadget: uvc: use configfs entries for negotiation and v4l2 VIDIOCS

Greg KH
2022-09-07T13:29:02Z

On Wed, Jun 08, 2022 at 12:57:44PM +0200, Michael Grzeschik wrote:
> This series improves the uvc video gadget by parsing the configfs
> entries. With the configfs data, the driver now is able to negotiate the
> format with the usb host in the kernel and also exports the supported
> frames/formats/intervals via the v4l2 VIDIOC interface.
>
> The uvc userspace stack is also under development. One example is an generic
> v4l2uvcsink gstreamer elemnt, which is currently under discussion. [1]
>
> [1] https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1304
>
> With the libusbgx library [1] used by the gadget-tool [2] it is now also
> possible to fully describe the configfs layout of the uvc gadget with scheme
> files.
>
> [2] https://github.com/linux-usb-gadgets/libusbgx/pull/61/commits/53231c76f9d512f59fdc23b65cd5c46b7fb09eb4
>
> [3] https://github.com/linux-usb-gadgets/gt/tree/master/examples/systemd
>
> The bigger picture of these patches is to provide a more versatile interface to
> the uvc gadget. The goal is to simply start a uvc-gadget with the following
> commands:
>
> $ gt load uvc.scheme
> $ gst-launch v4l2src ! v4l2uvcsink

v4l developers, given a lack of review response to this series, I'm
assuming that you all have no objection to this series and I can take it
through my usb-next tree.

thanks,

greg k-h