Re: [PATCH v8 0/4] usb: gadget: uvc: use configfs entries for negotiation and v4l2 VIDIOCS

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On Wed, Sep 07, 2022 at 04:52:04PM +0200, Michael Grzeschik wrote:
> On Wed, Sep 07, 2022 at 04:28:34PM +0200, Greg KH wrote:
> > On Wed, Sep 07, 2022 at 04:02:50PM +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
> > > 
> > > --
> > > 
> > > v1: https://lore.kernel.org/linux-usb/20210530222239.8793-1-m.grzeschik@xxxxxxxxxxxxxx/
> > > v2: https://lore.kernel.org/linux-usb/20211117004432.3763306-1-m.grzeschik@xxxxxxxxxxxxxx/
> > > v3: https://lore.kernel.org/linux-usb/20211117122435.2409362-1-m.grzeschik@xxxxxxxxxxxxxx/
> > > v4: https://lore.kernel.org/linux-usb/20211205225803.268492-1-m.grzeschik@xxxxxxxxxxxxxx/
> > > v5: https://lore.kernel.org/linux-usb/20211209084322.2662616-1-m.grzeschik@xxxxxxxxxxxxxx/
> > > v6: https://lore.kernel.org/linux-usb/20220105115527.3592860-1-m.grzeschik@xxxxxxxxxxxxxx/
> > > v7: https://lore.kernel.org/linux-usb/20220608105748.139922-1-m.grzeschik@xxxxxxxxxxxxxx/
> > 
> > Please say what changed somewhere :(
> 
> I addressed each patch individually.

Ah, yes, my mistake, I see that in the individual patches, sorry for the
noise.

greg k-h



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