Hello all This series adds support for the definition of extension units in configfs for the UVC Gadget. The XUs are modelled as config_items within a new "extensions" group under control, which seemed like an appropriate place to put them. To allow the XU's to be inserted in the function graph, the bSourceID attribute for the default output terminal is made writeable - users will need to configure it with the bUnitID of the XU that they want to use as the OT's source. This does mean that the XUs can _only_ be placed immediately preceding the OT, but I think that that's fine for now. Series level changes: - Added patches 5-9 which additionally add the ability to create string descriptors through configfs and link them to the extension units as well as to override the default descriptors for the IAD and VC/VS interfaces The XUs configured through this series have been tested via uvc-gadget, uvcvideo and uvcdynctrl. Thanks Dan Daniel Scally (9): usb: gadget: uvc: Make bSourceID read/write usb: gadget: uvc: Generalise helper functions for reuse usb: gadget: uvc: Allow definition of XUs in configfs usb: gadget: uvc: Copy XU descriptors during .bind() usb: gadget: uvc: Support arbitrary string descriptors usb: gadget: uvc: Allow linking XUs to string descriptors usb: gadget: uvc: Attach custom string descriptors usb: gadget: uvc: Allow linking function to string descs usb: gadget: uvc: Use custom strings if available .../ABI/testing/configfs-usb-gadget-uvc | 50 +- drivers/usb/gadget/function/f_uvc.c | 134 +- drivers/usb/gadget/function/u_uvc.h | 22 + drivers/usb/gadget/function/uvc.h | 1 + drivers/usb/gadget/function/uvc_configfs.c | 1087 ++++++++++++++++- drivers/usb/gadget/function/uvc_configfs.h | 60 + 6 files changed, 1283 insertions(+), 71 deletions(-) -- 2.34.1
