Hello everybody, what is the currently recommended way to create a USB composite device consisting of two UVC functions, for instance two RGB cameras or one RGB camera and an IR camera? My current simple approach [1] configuring two UVC devices via configfs and having two separate uvc-gadget processes dealing with the corresponding video device nodes does not work in its current state. The RGB camera and the IR camera used individually work as intended. I'm new to the USB Gadget API and Video4Linux and would appreciate any help in implementing a working USB composite device with two cameras that can be used simultaneously. The goal of my research project is figuring out if it is possible to create a Microsoft Windows Hello-compatible USB camera using a simple single-board computer running Linux like a Raspberry Pi. It is also interesting for me to know, if my current approach with the uvc-gadget is working at all for my set goal or if I have to create a kernel module for such a USB composite device. Error and lsusb ouputs of my non-working implementation are also available in the corresponding GitHub repository [2]. Best regards, Matthias [1] https://github.com/mdeeg/uvc-gadget-subface [2] https://github.com/mdeeg/uvc-gadget-subface/tree/master/debug
