Documentation/usb/gadget_uvc.rst

2 Linux UVC Gadget Driver
7 The UVC Gadget driver is a driver for hardware on the *device* side of a USB
14 On the host side (once connected via USB cable), a device running the UVC Gadget
15 driver *and controlled by an appropriate userspace program* should appear as a UVC
26 USB_F_UVC must be selected to enable support for the UVC gadget.
30 The UVC Gadget expects to be configured through configfs using the UVC function.
31 This allows a significant degree of flexibility, as many of a UVC device's
35 see Documentation/ABI/testing/configfs-usb-gadget-uvc
42 The UVC Function
45 The first step is to create the UVC function:
52 	FUNCTION="$GADGET/functions/uvc.0"
72 	uvc.0 +
136 section of the UVC specification.
158 For details about the valid values, consult the UVC specification. Note that a
169 The UVC specification requires that Format and Frame descriptors be preceded by
203 A UVC Extension Unit (XU) basically provides a distinct unit to which control set
206 of the UVC specification (for example enabling or disabling video effects). An
207 XU can be inserted into the UVC unit chain or left free-hanging.
222 	# the XU into the UVC chain between the PU and OT such that the final
281 The Camera Terminal and Processing Units in the UVC chain also have bmControls
284 the UVC specification; you should consult the "Camera Terminal Descriptor" and
303 Unit is fixed by the UVC specification, and so the bControlSize attribute is
311 be linked to from the UVC function root or from Extension Unit directories to
339 UVC (which should respond through the interrupt endpoint rather than tying up
366 The values passed here will be clamped to valid values according to the UVC
368 how the settings influence bandwidth you should consult the UVC specifications,
376 By itself, the UVC Gadget driver cannot do anything particularly interesting. It
377 must be paired with a userspace program that responds to UVC control requests and
380 document, but a reference application can be found at https://gitlab.freedesktop.org/camera/uvc-gad…