Ccing Nicolas and Kieran. BTW: I have some wip patches in my queue to get isoc support running on the dummy_hcd driver. With those patches, it is easy to test this series on any system (like qemu) without the need of an actual udc device. If interested, I could improve and send them on the list. Thanks, Michael On Wed, Jan 05, 2022 at 12:55:20PM +0100, 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 duiscussion. [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/ Regards, Michael Michael Grzeschik (7): media: v4l: move helper functions for fractions from uvc to v4l2-common media: uvcvideo: move uvc_format_desc to common header usb: gadget: uvc: prevent index variables to start from 0 usb: gadget: uvc: move structs to common header usb: gadget: uvc: track frames in format entries 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 | 281 +------------- drivers/media/usb/uvc/uvc_v4l2.c | 14 +- drivers/media/usb/uvc/uvcvideo.h | 144 -------- drivers/media/v4l2-core/v4l2-common.c | 82 +++++ drivers/usb/gadget/function/f_uvc.c | 263 +++++++++++++- drivers/usb/gadget/function/uvc.h | 38 +- drivers/usb/gadget/function/uvc_configfs.c | 148 ++------ drivers/usb/gadget/function/uvc_configfs.h | 120 +++++- drivers/usb/gadget/function/uvc_queue.c | 3 +- drivers/usb/gadget/function/uvc_v4l2.c | 404 ++++++++++++++++++--- drivers/usb/gadget/function/uvc_video.c | 71 +++- include/media/v4l2-common.h | 4 + include/media/v4l2-uvc.h | 351 ++++++++++++++++++ 14 files changed, 1319 insertions(+), 605 deletions(-) create mode 100644 include/media/v4l2-uvc.h -- 2.30.2
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