mos7840_get_uart_reg
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);