112 	struct slcan *sl = netdev_priv(ndev);  in slcan_err_rst_on_open()  local
114 	return !!test_bit(CF_ERR_RST, &sl->cmd_flags);  in slcan_err_rst_on_open()
119 	struct slcan *sl = netdev_priv(ndev);  in slcan_enable_err_rst_on_open()  local
125 		set_bit(CF_ERR_RST, &sl->cmd_flags);  in slcan_enable_err_rst_on_open()
127 		clear_bit(CF_ERR_RST, &sl->cmd_flags);  in slcan_enable_err_rst_on_open()
171 static void slcan_bump_frame(struct slcan *sl)  in slcan_bump_frame()  argument
177 	char *cmd = sl->rbuff;  in slcan_bump_frame()
179 	skb = alloc_can_skb(sl->dev, &cf);  in slcan_bump_frame()
181 		sl->dev->stats.rx_dropped++;  in slcan_bump_frame()
191 		cf->len = sl->rbuff[SLCAN_CMD_LEN + SLCAN_SFF_ID_LEN];  in slcan_bump_frame()
192 		sl->rbuff[SLCAN_CMD_LEN + SLCAN_SFF_ID_LEN] = 0;  in slcan_bump_frame()
202 		cf->len = sl->rbuff[SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN];  in slcan_bump_frame()
203 		sl->rbuff[SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN] = 0;  in slcan_bump_frame()
211 	if (kstrtou32(sl->rbuff + SLCAN_CMD_LEN, 16, &tmpid))  in slcan_bump_frame()
238 	sl->dev->stats.rx_packets++;  in slcan_bump_frame()
240 		sl->dev->stats.rx_bytes += cf->len;  in slcan_bump_frame()
246 	sl->dev->stats.rx_errors++;  in slcan_bump_frame()
258 static void slcan_bump_state(struct slcan *sl)  in slcan_bump_state()  argument
260 	struct net_device *dev = sl->dev;  in slcan_bump_state()
263 	char *cmd = sl->rbuff;  in slcan_bump_state()
284 	if (state == sl->can.state || sl->rcount < SLCAN_STATE_FRAME_LEN)  in slcan_bump_state()
322 static void slcan_bump_err(struct slcan *sl)  in slcan_bump_err()  argument
324 	struct net_device *dev = sl->dev;  in slcan_bump_err()
327 	char *cmd = sl->rbuff;  in slcan_bump_err()
338 	if ((len + SLCAN_CMD_LEN + 1) > sl->rcount)  in slcan_bump_err()
435 static void slcan_bump(struct slcan *sl)  in slcan_bump()  argument
437 	switch (sl->rbuff[0]) {  in slcan_bump()
445 		return slcan_bump_frame(sl);  in slcan_bump()
447 		return slcan_bump_err(sl);  in slcan_bump()
449 		return slcan_bump_state(sl);  in slcan_bump()
456 static void slcan_unesc(struct slcan *sl, unsigned char s)  in slcan_unesc()  argument
459 		if (!test_and_clear_bit(SLF_ERROR, &sl->flags) &&  in slcan_unesc()
460 		    sl->rcount > 4)  in slcan_unesc()
461 			slcan_bump(sl);  in slcan_unesc()
463 		sl->rcount = 0;  in slcan_unesc()
465 		if (!test_bit(SLF_ERROR, &sl->flags))  {  in slcan_unesc()
466 			if (sl->rcount < SLCAN_MTU)  {  in slcan_unesc()
467 				sl->rbuff[sl->rcount++] = s;  in slcan_unesc()
471 			sl->dev->stats.rx_over_errors++;  in slcan_unesc()
472 			set_bit(SLF_ERROR, &sl->flags);  in slcan_unesc()
482 static void slcan_encaps(struct slcan *sl, struct can_frame *cf)  in slcan_encaps()  argument
489 	pos = sl->xbuff;  in slcan_encaps()
523 		sl->dev->stats.tx_bytes += cf->len;  in slcan_encaps()
536 	set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_encaps()
537 	actual = sl->tty->ops->write(sl->tty, sl->xbuff, pos - sl->xbuff);  in slcan_encaps()
538 	sl->xleft = (pos - sl->xbuff) - actual;  in slcan_encaps()
539 	sl->xhead = sl->xbuff + actual;  in slcan_encaps()
545 	struct slcan *sl = container_of(work, struct slcan, tx_work);  in slcan_transmit()  local
548 	spin_lock_bh(&sl->lock);  in slcan_transmit()
550 	if (unlikely(!netif_running(sl->dev)) &&  in slcan_transmit()
551 	    likely(!test_bit(SLF_XCMD, &sl->flags))) {  in slcan_transmit()
552 		spin_unlock_bh(&sl->lock);  in slcan_transmit()
556 	if (sl->xleft <= 0)  {  in slcan_transmit()
557 		if (unlikely(test_bit(SLF_XCMD, &sl->flags))) {  in slcan_transmit()
558 			clear_bit(SLF_XCMD, &sl->flags);  in slcan_transmit()
559 			clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_transmit()
560 			spin_unlock_bh(&sl->lock);  in slcan_transmit()
561 			wake_up(&sl->xcmd_wait);  in slcan_transmit()
568 		sl->dev->stats.tx_packets++;  in slcan_transmit()
569 		clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_transmit()
570 		spin_unlock_bh(&sl->lock);  in slcan_transmit()
571 		netif_wake_queue(sl->dev);  in slcan_transmit()
575 	actual = sl->tty->ops->write(sl->tty, sl->xhead, sl->xleft);  in slcan_transmit()
576 	sl->xleft -= actual;  in slcan_transmit()
577 	sl->xhead += actual;  in slcan_transmit()
578 	spin_unlock_bh(&sl->lock);  in slcan_transmit()
586 	struct slcan *sl = tty->disc_data;  in slcan_write_wakeup()  local
588 	schedule_work(&sl->tx_work);  in slcan_write_wakeup()
595 	struct slcan *sl = netdev_priv(dev);  in slcan_netdev_xmit()  local
600 	spin_lock(&sl->lock);  in slcan_netdev_xmit()
602 		spin_unlock(&sl->lock);  in slcan_netdev_xmit()
606 	if (!sl->tty) {  in slcan_netdev_xmit()
607 		spin_unlock(&sl->lock);  in slcan_netdev_xmit()
611 	netif_stop_queue(sl->dev);  in slcan_netdev_xmit()
612 	slcan_encaps(sl, (struct can_frame *)skb->data); /* encaps & send */  in slcan_netdev_xmit()
613 	spin_unlock(&sl->lock);  in slcan_netdev_xmit()
626 static int slcan_transmit_cmd(struct slcan *sl, const unsigned char *cmd)  in slcan_transmit_cmd()  argument
630 	spin_lock(&sl->lock);  in slcan_transmit_cmd()
631 	if (!sl->tty) {  in slcan_transmit_cmd()
632 		spin_unlock(&sl->lock);  in slcan_transmit_cmd()
636 	n = scnprintf(sl->xbuff, sizeof(sl->xbuff), "%s", cmd);  in slcan_transmit_cmd()
637 	set_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_transmit_cmd()
638 	actual = sl->tty->ops->write(sl->tty, sl->xbuff, n);  in slcan_transmit_cmd()
639 	sl->xleft = n - actual;  in slcan_transmit_cmd()
640 	sl->xhead = sl->xbuff + actual;  in slcan_transmit_cmd()
641 	set_bit(SLF_XCMD, &sl->flags);  in slcan_transmit_cmd()
642 	spin_unlock(&sl->lock);  in slcan_transmit_cmd()
643 	ret = wait_event_interruptible_timeout(sl->xcmd_wait,  in slcan_transmit_cmd()
644 					       !test_bit(SLF_XCMD, &sl->flags),  in slcan_transmit_cmd()
646 	clear_bit(SLF_XCMD, &sl->flags);  in slcan_transmit_cmd()
659 	struct slcan *sl = netdev_priv(dev);  in slcan_netdev_close()  local
662 	if (sl->can.bittiming.bitrate &&  in slcan_netdev_close()
663 	    sl->can.bittiming.bitrate != CAN_BITRATE_UNKNOWN) {  in slcan_netdev_close()
664 		err = slcan_transmit_cmd(sl, "C\r");  in slcan_netdev_close()
671 	clear_bit(TTY_DO_WRITE_WAKEUP, &sl->tty->flags);  in slcan_netdev_close()
672 	flush_work(&sl->tx_work);  in slcan_netdev_close()
675 	sl->rcount   = 0;  in slcan_netdev_close()
676 	sl->xleft    = 0;  in slcan_netdev_close()
678 	sl->can.state = CAN_STATE_STOPPED;  in slcan_netdev_close()
679 	if (sl->can.bittiming.bitrate == CAN_BITRATE_UNKNOWN)  in slcan_netdev_close()
680 		sl->can.bittiming.bitrate = CAN_BITRATE_UNSET;  in slcan_netdev_close()
688 	struct slcan *sl = netdev_priv(dev);  in slcan_netdev_open()  local
697 	if (sl->can.bittiming.bitrate == CAN_BITRATE_UNSET)  in slcan_netdev_open()
698 		sl->can.bittiming.bitrate = CAN_BITRATE_UNKNOWN;  in slcan_netdev_open()
706 	if (sl->can.bittiming.bitrate != CAN_BITRATE_UNKNOWN) {  in slcan_netdev_open()
708 			if (sl->can.bittiming.bitrate == slcan_bitrate_const[s])  in slcan_netdev_open()
716 		err = slcan_transmit_cmd(sl, cmd);  in slcan_netdev_open()
724 		if (test_bit(CF_ERR_RST, &sl->cmd_flags)) {  in slcan_netdev_open()
725 			err = slcan_transmit_cmd(sl, "F\r");  in slcan_netdev_open()
733 		if (sl->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {  in slcan_netdev_open()
734 			err = slcan_transmit_cmd(sl, "L\r");  in slcan_netdev_open()
741 			err = slcan_transmit_cmd(sl, "O\r");  in slcan_netdev_open()
750 	sl->can.state = CAN_STATE_ERROR_ACTIVE;  in slcan_netdev_open()
780 	struct slcan *sl = tty->disc_data;  in slcan_receive_buf()  local
782 	if (!netif_running(sl->dev))  in slcan_receive_buf()
788 			if (!test_and_set_bit(SLF_ERROR, &sl->flags))  in slcan_receive_buf()
789 				sl->dev->stats.rx_errors++;  in slcan_receive_buf()
793 		slcan_unesc(sl, *cp++);  in slcan_receive_buf()
806 	struct slcan *sl;  in slcan_open()  local
815 	dev = alloc_candev(sizeof(*sl), 1);  in slcan_open()
819 	sl = netdev_priv(dev);  in slcan_open()
823 	sl->rcount = 0;  in slcan_open()
824 	sl->xleft = 0;  in slcan_open()
825 	spin_lock_init(&sl->lock);  in slcan_open()
826 	INIT_WORK(&sl->tx_work, slcan_transmit);  in slcan_open()
827 	init_waitqueue_head(&sl->xcmd_wait);  in slcan_open()
830 	sl->can.bitrate_const = slcan_bitrate_const;  in slcan_open()
831 	sl->can.bitrate_const_cnt = ARRAY_SIZE(slcan_bitrate_const);  in slcan_open()
832 	sl->can.ctrlmode_supported = CAN_CTRLMODE_LISTENONLY;  in slcan_open()
835 	sl->dev	= dev;  in slcan_open()
840 	sl->tty = tty;  in slcan_open()
841 	tty->disc_data = sl;  in slcan_open()
864 	struct slcan *sl = tty->disc_data;  in slcan_close()  local
866 	unregister_candev(sl->dev);  in slcan_close()
872 	flush_work(&sl->tx_work);  in slcan_close()
875 	spin_lock_bh(&sl->lock);  in slcan_close()
877 	sl->tty = NULL;  in slcan_close()
878 	spin_unlock_bh(&sl->lock);  in slcan_close()
880 	netdev_info(sl->dev, "slcan off %s.\n", tty->name);  in slcan_close()
881 	free_candev(sl->dev);  in slcan_close()
888 	struct slcan *sl = tty->disc_data;  in slcan_ioctl()  local
893 		tmp = strlen(sl->dev->name) + 1;  in slcan_ioctl()
894 		if (copy_to_user((void __user *)arg, sl->dev->name, tmp))  in slcan_ioctl()