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. The XUs configured through this series have been tested via uvc-gadget, uvcvideo and uvcdynctrl. The series is based on usb-testing plus my recent "usb: gadget: uvc: Correct documentation formatting" patch. Thanks Dan Daniel Scally (11): 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: configfs: Rename struct gadget_strings usb: gadget: configfs: Support arbitrary string descriptors usb: gadget: configfs: Attach arbitrary strings to cdev usb: gadget: uvc: Allow linking XUs to string descriptors usb: gadget: uvc: Pick up custom string descriptor IDs usb: gadget: uvc: Allow linking function to string descs usb: gadget: uvc: Use custom strings if available .../ABI/testing/configfs-usb-gadget-uvc | 30 +- Documentation/usb/gadget_configfs.rst | 10 + drivers/usb/gadget/configfs.c | 291 ++++++- drivers/usb/gadget/function/f_uvc.c | 69 +- drivers/usb/gadget/function/u_uvc.h | 15 + drivers/usb/gadget/function/uvc.h | 1 + drivers/usb/gadget/function/uvc_configfs.c | 771 ++++++++++++++++-- drivers/usb/gadget/function/uvc_configfs.h | 30 + include/linux/usb/composite.h | 1 + include/linux/usb/gadget.h | 11 + 10 files changed, 1138 insertions(+), 91 deletions(-) -- 2.34.1
