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can: slcan: add support for listen-only mode

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For non-legacy, i.e. ip based configuration, add support for listen-only
mode. If listen-only is requested send a listen-only ("L\r") command
instead of an open ("O\r") command to the adapter.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/all/20220728070254.267974-7-dario.binacchi@amarulasolutions.com
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Dario Binacchi 2022-07-28 09:02:53 +02:00 committed by Marc Kleine-Budde
parent 341c5724d7
commit 3e72013196
1 changed files with 15 additions and 4 deletions
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19
drivers/net/can/slcan/slcan-core.c
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@ -727,10 +727,20 @@ static int slcan_netdev_open(struct net_device *dev)
}
}
err = slcan_transmit_cmd(sl, "O\r");
if (err) {
netdev_err(dev, "failed to send open command 'O\\r'\n");
goto cmd_transmit_failed;
if (sl->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {
err = slcan_transmit_cmd(sl, "L\r");
if (err) {
netdev_err(dev,
"failed to send listen-only command 'L\\r'\n");
goto cmd_transmit_failed;
}
} else {
err = slcan_transmit_cmd(sl, "O\r");
if (err) {
netdev_err(dev,
"failed to send open command 'O\\r'\n");
goto cmd_transmit_failed;
}
}
}
@ -817,6 +827,7 @@ static int slcan_open(struct tty_struct *tty)
/* Configure CAN metadata */
sl->can.bitrate_const = slcan_bitrate_const;
sl->can.bitrate_const_cnt = ARRAY_SIZE(slcan_bitrate_const);
sl->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;
/* Configure netdev interface */
sl->dev = dev;