FPC202_REG_DEV_INVALID
fpc202_write_dev_addr(priv, chan_id, dev_num, FPC202_REG_DEV_INVALID);
ret = fpc202_write_dev_addr(priv, port_id, 0, FPC202_REG_DEV_INVALID);
return fpc202_write_dev_addr(priv, port_id, 1, FPC202_REG_DEV_INVALID);