greybus_register
ret = greybus_register(&gb_fw_core_driver);
retval = greybus_register(&gb_gbphy_driver);
retval = greybus_register(&gb_loopback_driver);
retval = greybus_register(&gb_raw_driver);
retval = greybus_register(&gb_vibrator_driver);
module_driver(__greybus_driver, greybus_register, greybus_deregister)