Commit 68f22c0c authored by Serge Semin's avatar Serge Semin Committed by Greg Kroah-Hartman
Browse files

tty: max310x: Add rx-during-tx rs485 flag support 



The driver currently sets the echo suppression bit by default when rs485
is enabled. Naturally it disables any data retrieval in rs485 mode while
RTSn is pushed up. The receiver gate (RX_) can be enabled just by clearing
(or not setting) the EchoSuprs bit of mode2 register. So by setting or
clearing the bit we implement the SER_RS485_RX_DURING_TX rs485 flag
support.

Signed-off-by: default avatarSerge Semin <fancer.lancer@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 35240ba2

drivers/tty/serial/max310x.c

+14 −15
Original line number Diff line number Diff line
@@ -975,25 +975,23 @@ static void max310x_set_termios(struct uart_port *port, 
static void max310x_rs_proc(struct work_struct *ws)

{

	struct max310x_one *one = container_of(ws, struct max310x_one, rs_work);

	unsigned int val;

	unsigned int delay, mode1 = 0, mode2 = 0;



	val = (one->port.rs485.delay_rts_before_send << 4) |

	delay = (one->port.rs485.delay_rts_before_send << 4) |

		one->port.rs485.delay_rts_after_send;

	max310x_port_write(&one->port, MAX310X_HDPIXDELAY_REG, val);

	max310x_port_write(&one->port, MAX310X_HDPIXDELAY_REG, delay);



	if (one->port.rs485.flags & SER_RS485_ENABLED) {

		mode1 = MAX310X_MODE1_TRNSCVCTRL_BIT;



		if (!(one->port.rs485.flags & SER_RS485_RX_DURING_TX))

			mode2 = MAX310X_MODE2_ECHOSUPR_BIT;

	}



	max310x_port_update(&one->port, MAX310X_MODE1_REG,

				MAX310X_MODE1_TRNSCVCTRL_BIT,

				MAX310X_MODE1_TRNSCVCTRL_BIT);

		max310x_port_update(&one->port, MAX310X_MODE2_REG,

				MAX310X_MODE2_ECHOSUPR_BIT,

				MAX310X_MODE2_ECHOSUPR_BIT);

	} else {

		max310x_port_update(&one->port, MAX310X_MODE1_REG,

				MAX310X_MODE1_TRNSCVCTRL_BIT, 0);

			MAX310X_MODE1_TRNSCVCTRL_BIT, mode1);

	max310x_port_update(&one->port, MAX310X_MODE2_REG,

				MAX310X_MODE2_ECHOSUPR_BIT, 0);

	}

			MAX310X_MODE2_ECHOSUPR_BIT, mode2);

}



static int max310x_rs485_config(struct uart_port *port,
@@ -1005,7 +1003,8 @@ static int max310x_rs485_config(struct uart_port *port, 
	    (rs485->delay_rts_after_send > 0x0f))

		return -ERANGE;



	rs485->flags &= SER_RS485_RTS_ON_SEND | SER_RS485_ENABLED;

	rs485->flags &= SER_RS485_RTS_ON_SEND | SER_RS485_RX_DURING_TX |

			SER_RS485_ENABLED;

	memset(rs485->padding, 0, sizeof(rs485->padding));

	port->rs485 = *rs485;

CRA Git | Maintained and supported by SUSTech CRA and CCSE