usb: gadget: uvc: configfs: Add interface number attributes

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The video control and video streaming interface numbers are needed in
the UVC gadget userspace stack to reply to UVC requests. They are
hardcoded to fixed values at the moment, preventing configurations with
multiple functions.

To fix this, make them dynamically discoverable by userspace through
read-only configfs attributes in <function>/control/bInterfaceNumber and
<function>/streaming/bInterfaceNumber respectively.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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Laurent Pinchart 2018-05-23 18:47:56 +03:00

parent efbf0af70b

commit bf71544883

4 changed files with 75 additions and 0 deletions

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8

Documentation/ABI/testing/configfs-usb-gadget-uvc

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2

drivers/usb/gadget/function/f_uvc.c

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3

drivers/usb/gadget/function/u_uvc.h

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62

drivers/usb/gadget/function/uvc_configfs.c

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