serial: general fixes in the serial_rs485 structure

Fix several issues related to the RS485 interface:

 - It adds the flag SER_RS485_RTS_BEFORE_SEND that was missing from the
   serial_rs485 structure (even if "delay_rts_before_send" was existing)

 - It adds a further "delay_rts_after_send" field for those drivers that
   can have a delay after send (e.g., atmel_serial)

 - It fixes the usage of the structure in the atmel_serial driver (where
   "delay_rts_before_send" should be used instead of "delay_rts_after_send").

Signed-off-by: Claudio Scordino <claudio@evidence.eu.com>
Signed-off-by: Bernhard Roth <br@pwrnet.de>
Cc: Philippe De Muyter <phdm@macqel.be>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index a182def7007d2c678b1712b9f7ca78fdc80042ca..3892666b5fbdf4cfe36e66f1a6092c7666afd2be 100644 (file)
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -217,7 +217,8 @@ void atmel_config_rs485(struct uart_port *port, struct serial_rs485 *rs485conf)
        if (rs485conf->flags & SER_RS485_ENABLED) {
                dev_dbg(port->dev, "Setting UART to RS485\n");
                atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
-               UART_PUT_TTGR(port, rs485conf->delay_rts_before_send);
+               if (rs485conf->flags & SER_RS485_RTS_AFTER_SEND)
+                       UART_PUT_TTGR(port, rs485conf->delay_rts_after_send);
                mode |= ATMEL_US_USMODE_RS485;
        } else {
                dev_dbg(port->dev, "Setting UART to RS232\n");
@@ -292,7 +293,9 @@ static void atmel_set_mctrl(struct uart_port *port, u_int mctrl)
 
        if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
                dev_dbg(port->dev, "Setting UART to RS485\n");
-               UART_PUT_TTGR(port, atmel_port->rs485.delay_rts_before_send);
+               if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
+                       UART_PUT_TTGR(port,
+                                       atmel_port->rs485.delay_rts_after_send);
                mode |= ATMEL_US_USMODE_RS485;
        } else {
                dev_dbg(port->dev, "Setting UART to RS232\n");
@@ -1211,7 +1214,9 @@ static void atmel_set_termios(struct uart_port *port, struct ktermios *termios,
 
        if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
                dev_dbg(port->dev, "Setting UART to RS485\n");
-               UART_PUT_TTGR(port, atmel_port->rs485.delay_rts_before_send);
+               if (atmel_port->rs485.flags & SER_RS485_RTS_AFTER_SEND)
+                       UART_PUT_TTGR(port,
+                                       atmel_port->rs485.delay_rts_after_send);
                mode |= ATMEL_US_USMODE_RS485;
        } else {
                dev_dbg(port->dev, "Setting UART to RS232\n");

diff --git a/include/linux/serial.h b/include/linux/serial.h
index c3b45add494dce24d5473d4f0c4346d3b7e52928..ef914061511ec833c706a38ddf47cac8ad52d93a 100644 (file)
--- a/include/linux/serial.h
+++ b/include/linux/serial.h
@@ -210,8 +210,10 @@ struct serial_rs485 {
 #define SER_RS485_ENABLED              (1 << 0)
 #define SER_RS485_RTS_ON_SEND          (1 << 1)
 #define SER_RS485_RTS_AFTER_SEND       (1 << 2)
+#define SER_RS485_RTS_BEFORE_SEND      (1 << 3)
        __u32   delay_rts_before_send;  /* Milliseconds */
-       __u32   padding[6];             /* Memory is cheap, new structs
+       __u32   delay_rts_after_send;   /* Milliseconds */
+       __u32   padding[5];             /* Memory is cheap, new structs
                                           are a royal PITA .. */
 };