121 	struct slcan *sl = netdev_priv(ndev);  in slcan_err_rst_on_open()  local
123 	return !!test_bit(CF_ERR_RST, &sl->cmd_flags);  in slcan_err_rst_on_open()
128 	struct slcan *sl = netdev_priv(ndev);  in slcan_enable_err_rst_on_open()  local
134 		set_bit(CF_ERR_RST, &sl->cmd_flags);  in slcan_enable_err_rst_on_open()
136 		clear_bit(CF_ERR_RST, &sl->cmd_flags);  in slcan_enable_err_rst_on_open()
180 static void slcan_bump_frame(struct slcan *sl)  in slcan_bump_frame()  argument
186 	char *cmd = sl->rbuff;  in slcan_bump_frame()
188 	if (sl->rcount < SLCAN_FRAME_MSG_LEN_MIN)  in slcan_bump_frame()
191 	skb = alloc_can_skb(sl->dev, &cf);  in slcan_bump_frame()
193 		sl->dev->stats.rx_dropped++;  in slcan_bump_frame()
203 		cf->len = sl->rbuff[SLCAN_CMD_LEN + SLCAN_SFF_ID_LEN];  in slcan_bump_frame()
204 		sl->rbuff[SLCAN_CMD_LEN + SLCAN_SFF_ID_LEN] = 0;  in slcan_bump_frame()
214 		cf->len = sl->rbuff[SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN];  in slcan_bump_frame()
215 		sl->rbuff[SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN] = 0;  in slcan_bump_frame()
223 	if (kstrtou32(sl->rbuff + SLCAN_CMD_LEN, 16, &tmpid))  in slcan_bump_frame()
250 	sl->dev->stats.rx_packets++;  in slcan_bump_frame()
252 		sl->dev->stats.rx_bytes += cf->len;  in slcan_bump_frame()
258 	sl->dev->stats.rx_errors++;  in slcan_bump_frame()
270 static void slcan_bump_state(struct slcan *sl)  in slcan_bump_state()  argument
272 	struct net_device *dev = sl->dev;  in slcan_bump_state()
275 	char *cmd = sl->rbuff;  in slcan_bump_state()
296 	if (state == sl->can.state || sl->rcount != SLCAN_STATE_MSG_LEN)  in slcan_bump_state()
334 static void slcan_bump_err(struct slcan *sl)  in slcan_bump_err()  argument
336 	struct net_device *dev = sl->dev;  in slcan_bump_err()
339 	char *cmd = sl->rbuff;  in slcan_bump_err()
343 	if (sl->rcount < SLCAN_ERROR_MSG_LEN_MIN)  in slcan_bump_err()
353 	if ((len + SLCAN_CMD_LEN + 1) > sl->rcount)  in slcan_bump_err()
450 static void slcan_bump(struct slcan *sl)  in slcan_bump()  argument
452 	switch (sl->rbuff[0]) {  in slcan_bump()
460 		return slcan_bump_frame(sl);  in slcan_bump()
462 		return slcan_bump_err(sl);  in slcan_bump()
464 		return slcan_bump_state(sl);  in slcan_bump()
471 static void slcan_unesc(struct slcan *sl, unsigned char s)  in slcan_unesc()  argument
474 		if (!test_and_clear_bit(SLF_ERROR, &sl->flags))  in slcan_unesc()
475 			slcan_bump(sl);  in slcan_unesc()
477 		sl->rcount = 0;  in slcan_unesc()
479 		if (!test_bit(SLF_ERROR, &sl->flags))  {  in slcan_unesc()
480 			if (sl->rcount < SLCAN_MTU)  {  in slcan_unesc()
481 				sl->rbuff[sl->rcount++] = s;  in slcan_unesc()
485 			sl->dev->stats.rx_over_errors++;  in slcan_unesc()
486 			set_bit(SLF_ERROR, &sl->flags);  in slcan_unesc()
496 static void slcan_encaps(struct slcan *sl, struct can_frame *cf)  in slcan_encaps()  argument
503 	pos = sl->xbuff;  in slcan_encaps()
537 		sl->dev->stats.tx_bytes += cf->len;  in slcan_encaps()
550 	set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_encaps()
551 	actual = sl->tty->ops->write(sl->tty, sl->xbuff, pos - sl->xbuff);  in slcan_encaps()
552 	sl->xleft = (pos - sl->xbuff) - actual;  in slcan_encaps()
553 	sl->xhead = sl->xbuff + actual;  in slcan_encaps()
559 	struct slcan *sl = container_of(work, struct slcan, tx_work);  in slcan_transmit()  local
562 	spin_lock_bh(&sl->lock);  in slcan_transmit()
564 	if (unlikely(!netif_running(sl->dev)) &&  in slcan_transmit()
565 	    likely(!test_bit(SLF_XCMD, &sl->flags))) {  in slcan_transmit()
566 		spin_unlock_bh(&sl->lock);  in slcan_transmit()
570 	if (sl->xleft <= 0)  {  in slcan_transmit()
571 		if (unlikely(test_bit(SLF_XCMD, &sl->flags))) {  in slcan_transmit()
572 			clear_bit(SLF_XCMD, &sl->flags);  in slcan_transmit()
573 			clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_transmit()
574 			spin_unlock_bh(&sl->lock);  in slcan_transmit()
575 			wake_up(&sl->xcmd_wait);  in slcan_transmit()
582 		sl->dev->stats.tx_packets++;  in slcan_transmit()
583 		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_transmit()
584 		spin_unlock_bh(&sl->lock);  in slcan_transmit()
585 		netif_wake_queue(sl->dev);  in slcan_transmit()
589 	actual = sl->tty->ops->write(sl->tty, sl->xhead, sl->xleft);  in slcan_transmit()
590 	sl->xleft -= actual;  in slcan_transmit()
591 	sl->xhead += actual;  in slcan_transmit()
592 	spin_unlock_bh(&sl->lock);  in slcan_transmit()
600 	struct slcan *sl = tty->disc_data;  in slcan_write_wakeup()  local
602 	schedule_work(&sl->tx_work);  in slcan_write_wakeup()
609 	struct slcan *sl = netdev_priv(dev);  in slcan_netdev_xmit()  local
614 	spin_lock(&sl->lock);  in slcan_netdev_xmit()
616 		spin_unlock(&sl->lock);  in slcan_netdev_xmit()
620 	if (!sl->tty) {  in slcan_netdev_xmit()
621 		spin_unlock(&sl->lock);  in slcan_netdev_xmit()
625 	netif_stop_queue(sl->dev);  in slcan_netdev_xmit()
626 	slcan_encaps(sl, (struct can_frame *)skb->data); /* encaps & send */  in slcan_netdev_xmit()
627 	spin_unlock(&sl->lock);  in slcan_netdev_xmit()
640 static int slcan_transmit_cmd(struct slcan *sl, const unsigned char *cmd)  in slcan_transmit_cmd()  argument
644 	spin_lock(&sl->lock);  in slcan_transmit_cmd()
645 	if (!sl->tty) {  in slcan_transmit_cmd()
646 		spin_unlock(&sl->lock);  in slcan_transmit_cmd()
650 	n = scnprintf(sl->xbuff, sizeof(sl->xbuff), "%s", cmd);  in slcan_transmit_cmd()
651 	set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_transmit_cmd()
652 	actual = sl->tty->ops->write(sl->tty, sl->xbuff, n);  in slcan_transmit_cmd()
653 	sl->xleft = n - actual;  in slcan_transmit_cmd()
654 	sl->xhead = sl->xbuff + actual;  in slcan_transmit_cmd()
655 	set_bit(SLF_XCMD, &sl->flags);  in slcan_transmit_cmd()
656 	spin_unlock(&sl->lock);  in slcan_transmit_cmd()
657 	ret = wait_event_interruptible_timeout(sl->xcmd_wait,  in slcan_transmit_cmd()
658 					       !test_bit(SLF_XCMD, &sl->flags),  in slcan_transmit_cmd()
660 	clear_bit(SLF_XCMD, &sl->flags);  in slcan_transmit_cmd()
673 	struct slcan *sl = netdev_priv(dev);  in slcan_netdev_close()  local
676 	if (sl->can.bittiming.bitrate &&  in slcan_netdev_close()
677 	    sl->can.bittiming.bitrate != CAN_BITRATE_UNKNOWN) {  in slcan_netdev_close()
678 		err = slcan_transmit_cmd(sl, "C\r");  in slcan_netdev_close()
685 	clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_netdev_close()
686 	flush_work(&sl->tx_work);  in slcan_netdev_close()
689 	sl->rcount   = 0;  in slcan_netdev_close()
690 	sl->xleft    = 0;  in slcan_netdev_close()
692 	sl->can.state = CAN_STATE_STOPPED;  in slcan_netdev_close()
693 	if (sl->can.bittiming.bitrate == CAN_BITRATE_UNKNOWN)  in slcan_netdev_close()
694 		sl->can.bittiming.bitrate = CAN_BITRATE_UNSET;  in slcan_netdev_close()
702 	struct slcan *sl = netdev_priv(dev);  in slcan_netdev_open()  local
711 	if (sl->can.bittiming.bitrate == CAN_BITRATE_UNSET)  in slcan_netdev_open()
712 		sl->can.bittiming.bitrate = CAN_BITRATE_UNKNOWN;  in slcan_netdev_open()
720 	if (sl->can.bittiming.bitrate != CAN_BITRATE_UNKNOWN) {  in slcan_netdev_open()
722 			if (sl->can.bittiming.bitrate == slcan_bitrate_const[s])  in slcan_netdev_open()
730 		err = slcan_transmit_cmd(sl, cmd);  in slcan_netdev_open()
738 		if (test_bit(CF_ERR_RST, &sl->cmd_flags)) {  in slcan_netdev_open()
739 			err = slcan_transmit_cmd(sl, "F\r");  in slcan_netdev_open()
747 		if (sl->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {  in slcan_netdev_open()
748 			err = slcan_transmit_cmd(sl, "L\r");  in slcan_netdev_open()
755 			err = slcan_transmit_cmd(sl, "O\r");  in slcan_netdev_open()
764 	sl->can.state = CAN_STATE_ERROR_ACTIVE;  in slcan_netdev_open()
794 	struct slcan *sl = tty->disc_data;  in slcan_receive_buf()  local
796 	if (!netif_running(sl->dev))  in slcan_receive_buf()
802 			if (!test_and_set_bit(SLF_ERROR, &sl->flags))  in slcan_receive_buf()
803 				sl->dev->stats.rx_errors++;  in slcan_receive_buf()
807 		slcan_unesc(sl, *cp++);  in slcan_receive_buf()
820 	struct slcan *sl;  in slcan_open()  local
829 	dev = alloc_candev(sizeof(*sl), 1);  in slcan_open()
833 	sl = netdev_priv(dev);  in slcan_open()
837 	sl->rcount = 0;  in slcan_open()
838 	sl->xleft = 0;  in slcan_open()
839 	spin_lock_init(&sl->lock);  in slcan_open()
840 	INIT_WORK(&sl->tx_work, slcan_transmit);  in slcan_open()
841 	init_waitqueue_head(&sl->xcmd_wait);  in slcan_open()
844 	sl->can.bitrate_const = slcan_bitrate_const;  in slcan_open()
845 	sl->can.bitrate_const_cnt = ARRAY_SIZE(slcan_bitrate_const);  in slcan_open()
846 	sl->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;  in slcan_open()
849 	sl->dev	= dev;  in slcan_open()
854 	sl->tty = tty;  in slcan_open()
855 	tty->disc_data = sl;  in slcan_open()
878 	struct slcan *sl = tty->disc_data;  in slcan_close()  local
880 	unregister_candev(sl->dev);  in slcan_close()
886 	flush_work(&sl->tx_work);  in slcan_close()
889 	spin_lock_bh(&sl->lock);  in slcan_close()
891 	sl->tty = NULL;  in slcan_close()
892 	spin_unlock_bh(&sl->lock);  in slcan_close()
894 	netdev_info(sl->dev, "slcan off %s.\n", tty->name);  in slcan_close()
895 	free_candev(sl->dev);  in slcan_close()
902 	struct slcan *sl = tty->disc_data;  in slcan_ioctl()  local
907 		tmp = strlen(sl->dev->name) + 1;  in slcan_ioctl()
908 		if (copy_to_user((void __user *)arg, sl->dev->name, tmp))  in slcan_ioctl()