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Mon, 30 Oct 2023 05:36:50 +0000 From: Crescent CY Hsieh To: Greg Kroah-Hartman , Jiri Slaby Cc: linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, Crescent CY Hsieh Subject: [PATCH] tty: serial: Add RS422 flag to struct serial_rs485 Date: Mon, 30 Oct 2023 13:36:32 +0800 Message-Id: <20231030053632.5109-1-crescentcy.hsieh@moxa.com> X-Mailer: git-send-email 2.34.1 X-ClientProxiedBy: TYBP286CA0013.JPNP286.PROD.OUTLOOK.COM (2603:1096:404:ce::25) To PUZPR01MB5405.apcprd01.prod.exchangelabs.com (2603:1096:301:115::14) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR01MB5405:EE_|PUZPR01MB5211:EE_ X-MS-Office365-Filtering-Correlation-Id: defd0686-c721-4797-91a0-08dbd90a3732 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; 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In case of interfaces confliction, add checks within uart_sanitize_serial_rs485() such that only one of RS422/RS485 is set. Signed-off-by: Crescent CY Hsieh --- drivers/tty/serial/serial_core.c | 19 +++++++++++++++++-- include/uapi/linux/serial.h | 4 ++++ 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 831d03361..afbffa9dd 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -1305,7 +1305,7 @@ static int uart_get_icount(struct tty_struct *tty, #define SER_RS485_LEGACY_FLAGS (SER_RS485_ENABLED | SER_RS485_RTS_ON_SEND | \ SER_RS485_RTS_AFTER_SEND | SER_RS485_RX_DURING_TX | \ - SER_RS485_TERMINATE_BUS) + SER_RS485_TERMINATE_BUS | SER_RS422_ENABLED) static int uart_check_rs485_flags(struct uart_port *port, struct serial_rs485 *rs485) { @@ -1371,11 +1371,26 @@ static void uart_sanitize_serial_rs485(struct uart_port *port, struct serial_rs4 { u32 supported_flags = port->rs485_supported.flags; - if (!(rs485->flags & SER_RS485_ENABLED)) { + if (!(rs485->flags & (SER_RS485_ENABLED | SER_RS422_ENABLED))) { memset(rs485, 0, sizeof(*rs485)); return; } + /* Pick sane setting if the user enables both interfaces */ + if (rs485->flags & (SER_RS485_ENABLED | SER_RS422_ENABLED)) { + dev_warn_ratelimited(port->dev, + "%s (%d): Invalid serial interface setting, using RS485 instead\n", + port->name, port->line); + rs485->flags &= ~SER_RS422_ENABLED; + } + + /* Clear other bits and return if RS422 is enabled */ + if (rs485->flags & SER_RS422_ENABLED) { + memset(rs485, 0, sizeof(*rs485)); + rs485->flags |= SER_RS422_ENABLED; + 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) == diff --git a/include/uapi/linux/serial.h b/include/uapi/linux/serial.h index 53bc1af67..427609fd5 100644 --- a/include/uapi/linux/serial.h +++ b/include/uapi/linux/serial.h @@ -137,6 +137,8 @@ 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_RS422_ENABLED - RS422 enabled. */ struct serial_rs485 { __u32 flags; @@ -149,6 +151,8 @@ struct serial_rs485 { #define SER_RS485_ADDR_RECV (1 << 7) #define SER_RS485_ADDR_DEST (1 << 8) +#define SER_RS422_ENABLED (1 << 9) + __u32 delay_rts_before_send; __u32 delay_rts_after_send;