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tty: serial: Add RS422 flag to struct serial_rs485

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Add "SER_RS485_MODE_RS422" flag to struct serial_rs485, so that serial
port can switch interface into RS422 if supported by using ioctl command
"TIOCSRS485".

By treating RS422 as a mode of RS485, which means while enabling RS422
there are two flags need to be set (SER_RS485_ENABLED and
SER_RS485_MODE_RS422), it would make things much easier. For example
some places that checks for "SER_RS485_ENABLED" won't need to be rewritten.

Signed-off-by: Crescent CY Hsieh <crescentcy.hsieh@moxa.com>
Link: https://lore.kernel.org/r/20231201071554.258607-3-crescentcy.hsieh@moxa.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Crescent CY Hsieh 2023-12-01 15:15:54 +08:00 committed by Greg Kroah-Hartman
parent 76ac8e2985
commit 6056f20f27
2 changed files with 8 additions and 0 deletions
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6
drivers/tty/serial/serial_core.c
View File

@ -1370,6 +1370,12 @@ static void uart_sanitize_serial_rs485(struct uart_port *port, struct serial_rs4
return;
}
/* Clear other RS485 flags but SER_RS485_TERMINATE_BUS and return if enabling RS422 */
if (rs485->flags & SER_RS485_MODE_RS422) {
rs485->flags &= (SER_RS485_ENABLED | SER_RS485_MODE_RS422 | SER_RS485_TERMINATE_BUS);
return;
}
/* Pick sane settings if the user hasn't */
if ((supported_flags & (SER_RS485_RTS_ON_SEND|SER_RS485_RTS_AFTER_SEND)) &&
!(rs485->flags & SER_RS485_RTS_ON_SEND) ==

2
include/uapi/linux/serial.h
View File

@ -138,6 +138,7 @@ struct serial_icounter_struct {
* * %SER_RS485_ADDRB - Enable RS485 addressing mode.
* * %SER_RS485_ADDR_RECV - Receive address filter (enables @addr_recv). Requires %SER_RS485_ADDRB.
* * %SER_RS485_ADDR_DEST - Destination address (enables @addr_dest). Requires %SER_RS485_ADDRB.
* * %SER_RS485_MODE_RS422 - Enable RS422. Requires %SER_RS485_ENABLED.
*/
struct serial_rs485 {
__u32 flags;
@ -149,6 +150,7 @@ struct serial_rs485 {
#define SER_RS485_ADDRB _BITUL(5)
#define SER_RS485_ADDR_RECV _BITUL(6)
#define SER_RS485_ADDR_DEST _BITUL(7)
#define SER_RS485_MODE_RS422 _BITUL(8)
__u32 delay_rts_before_send;
__u32 delay_rts_after_send;