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

[Michael Grzeschik <mgr@pengutronix.de>]

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Gentle Ping!

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
>
>--
>
>v1: https://lore.kernel.org/linux-usb/20210530222239.8793-1-m.grzeschik@pengutronix.de/
>v2: https://lore.kernel.org/linux-usb/20211117004432.3763306-1-m.grzeschik@pengutronix.de/
>v3: https://lore.kernel.org/linux-usb/20211117122435.2409362-1-m.grzeschik@pengutronix.de/
>v4: https://lore.kernel.org/linux-usb/20211205225803.268492-1-m.grzeschik@pengutronix.de/
>v5: https://lore.kernel.org/linux-usb/20211209084322.2662616-1-m.grzeschik@pengutronix.de/
>v6: https://lore.kernel.org/linux-usb/20220105115527.3592860-1-m.grzeschik@pengutronix.de/
>
>Regards,
>Michael
>
>Michael Grzeschik (4):
>  media: v4l: move helper functions for fractions from uvc to
>    v4l2-common
>  media: uvcvideo: move uvc_format_desc to common header
>  usb: gadget: uvc: add VIDIOC function
>  usb: gadget: uvc: add format/frame handling code
>
> drivers/media/usb/uvc/uvc_ctrl.c        |   1 +
> drivers/media/usb/uvc/uvc_driver.c      | 286 +---------------
> drivers/media/usb/uvc/uvc_v4l2.c        |  14 +-
> drivers/media/usb/uvc/uvcvideo.h        | 147 ---------
> drivers/media/v4l2-core/v4l2-common.c   |  82 +++++
> drivers/usb/gadget/function/f_uvc.c     | 270 +++++++++++++++-
> drivers/usb/gadget/function/uvc.h       |  39 ++-
> drivers/usb/gadget/function/uvc_queue.c |   3 +-
> drivers/usb/gadget/function/uvc_v4l2.c  | 412 +++++++++++++++++++++---
> drivers/usb/gadget/function/uvc_video.c |  71 +++-
> include/media/v4l2-common.h             |   4 +
> include/media/v4l2-uvc.h                | 359 +++++++++++++++++++++
> 12 files changed, 1187 insertions(+), 501 deletions(-)
> create mode 100644 include/media/v4l2-uvc.h
>
>-- 
>2.30.2
>
>
>

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