[RFC PATCH v3 6/9] can: slcan: add support for listen-only mode
From: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Date: 2022-07-26 21:03:54
Also in:
linux-can, lkml
Subsystem:
can network drivers, slcan can network driver, the rest · Maintainers:
Marc Kleine-Budde, Vincent Mailhol, Dario Binacchi, Linus Torvalds
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