On Fri, 2009-01-02 at 17:26 +0100, Matthias Fuchs wrote: > Some Exar UARTs support a auto rs485 mode. In this mode > the UART's RTS# pin is activated during transmitting and > can be used to enable a rs485 line driver. --->8---- > + > + case TIOCGRS485: > + { > + struct serial_rs485 rs485ctrl; Should the TIOCGRS485 call set delay_rts_before_send structure element to 0 to demonstrate that there is no delay ability? memset(&rs485ctrl, 0, sizeof(struct serial_rs485)); missing? > + > + if (port->type != PORT_16850) > + return -ENOTTY; > + > + spin_lock_irqsave(&up->port.lock, flags); > + serial_outp(up, UART_LCR, 0xbf); > + if (serial_inp(up, UART_FCTR) & UART_FCTR_RS485) > + rs485ctrl.flags = SER_RS485_ENABLED; > + else > + rs485ctrl.flags = 0; > + serial_outp(up, UART_LCR, 0); > + spin_unlock_irqrestore(&up->port.lock, flags); > + > + if (copy_to_user((struct serial_rs485 *)arg, > + &rs485ctrl, > + sizeof(rs485ctrl))) > + return -EFAULT; > + return 0; > + } -- Christopher Gibson <chris@xxxxxxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html