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Subject[RFC PATCH v3 6/9] can: slcan: add support for listen-only mode
Date
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>

---

(no changes since v2)

Changes in v2:
- Remove comment on listen-only command.
- Update the commit subject and description.

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 d12d98426f37..45e521910236 100644
--- a/drivers/net/can/slcan/slcan-core.c
+++ b/drivers/net/can/slcan/slcan-core.c
@@ -726,10 +726,20 @@ 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;
+ }
}
}

@@ -816,6 +826,7 @@ 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;
--
2.32.0
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