gud_usb_set
ret = gud_usb_set(gdrm, GUD_REQ_SET_CONNECTOR_FORCE_DETECT,
return gud_usb_set(gdrm, request, 0, &val, sizeof(val));
int gud_usb_set(struct gud_device *gdrm, u8 request, u16 index, void *buf, size_t len);
ret = gud_usb_set(gdrm, GUD_REQ_SET_BUFFER, 0, &req, sizeof(req));
ret = gud_usb_set(gdrm, GUD_REQ_SET_STATE_CHECK, 0, req, len);
gud_usb_set(gdrm, GUD_REQ_SET_STATE_COMMIT, 0, NULL, 0);