From: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/20220728070254.267974-7-dario.binacchi@xxxxxxxxxxxxxxxxxxxx
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
drivers/net/can/slcan/slcan-core.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/drivers/net/can/slcan/slcan-core.c b/drivers/net/can/slcan/slcan-core.c
index 740d82d68ca4..5c7dffc1ada2 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -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;
--
2.35.1
