usb_gadget_register_driver
return usb_gadget_register_driver(gadget_driver);
ret = usb_gadget_register_driver(&gi->composite.gadget_driver);
return usb_gadget_register_driver(&dbgp_driver);
value = usb_gadget_register_driver(&gadgetfs_driver);
ret = usb_gadget_register_driver(&dev->driver);