media: uvcvideo: Only create input devs if hw supports it
Examine the stream headers to figure out if the device has a button and can be used as an input. Signed-off-by: Ricardo Ribalda <ribalda@chromium.org> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
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