qcom_geni_set_rs485_mode
qcom_geni_set_rs485_mode(uport, SER_RS485_RTS_AFTER_SEND);
qcom_geni_set_rs485_mode(uport, SER_RS485_ENABLED);
qcom_geni_set_rs485_mode(uport, SER_RS485_RTS_ON_SEND);