Commit 3e720131 authored by Dario Binacchi's avatar Dario Binacchi Committed by Marc Kleine-Budde
Browse files

can: slcan: add support for listen-only mode 



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: default avatarDario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/all/20220728070254.267974-7-dario.binacchi@amarulasolutions.com


Signed-off-by: default avatarMarc Kleine-Budde <mkl@pengutronix.de>
parent 341c5724

drivers/net/can/slcan/slcan-core.c

+15 −4
Original line number Diff line number Diff line
@@ -727,12 +727,22 @@ static int slcan_netdev_open(struct net_device *dev) 
			}

		}



		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");

				netdev_err(dev,

					   "failed to send open command 'O\\r'\n");

				goto cmd_transmit_failed;

			}

		}

	}



	sl->can.state = CAN_STATE_ERROR_ACTIVE;

	netif_start_queue(dev);
@@ -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;