4 * Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
5 * Copyright (C) 2006 Andrey Volkov, Varma Electronics
6 * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the version 2 of the GNU General Public License
10 * as published by the Free Software Foundation
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/module.h>
23 #include <linux/version.h>
24 #include <linux/kernel.h>
25 #include <linux/netdevice.h>
26 #include <linux/if_arp.h>
27 #include <socketcan/can.h>
28 #include <socketcan/can/dev.h>
29 #ifndef CONFIG_CAN_DEV_SYSFS
30 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
31 #error "CAN netlink interface not support by this kernel version"
33 #include <socketcan/can/netlink.h>
34 #include <net/rtnetlink.h>
36 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)
37 #error "CAN sysfs interface not support by this kernel version"
42 #define MOD_DESC "CAN device driver interface"
44 MODULE_DESCRIPTION(MOD_DESC);
45 MODULE_LICENSE("GPL v2");
46 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
48 #ifdef CONFIG_CAN_CALC_BITTIMING
49 #define CAN_CALC_MAX_ERROR 50 /* in one-tenth of a percent */
52 * Bit-timing calculation derived from:
54 * Code based on LinCAN sources and H8S2638 project
55 * Copyright 2004-2006 Pavel Pisa - DCE FELK CVUT cz
56 * Copyright 2005 Stanislav Marek
57 * email: pisa@cmp.felk.cvut.cz
59 * Calculates proper bit-timing parameters for a specified bit-rate
60 * and sample-point, which can then be used to set the bit-timing
61 * registers of the CAN controller. You can find more information
62 * in the header file socketcan/can/netlink.h.
64 static int can_update_spt(const struct can_bittiming_const *btc,
65 int sampl_pt, int tseg, int *tseg1, int *tseg2)
67 *tseg2 = tseg + 1 - (sampl_pt * (tseg + 1)) / 1000;
68 if (*tseg2 < btc->tseg2_min)
69 *tseg2 = btc->tseg2_min;
70 if (*tseg2 > btc->tseg2_max)
71 *tseg2 = btc->tseg2_max;
72 *tseg1 = tseg - *tseg2;
73 if (*tseg1 > btc->tseg1_max) {
74 *tseg1 = btc->tseg1_max;
75 *tseg2 = tseg - *tseg1;
77 return 1000 * (tseg + 1 - *tseg2) / (tseg + 1);
80 static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt)
82 struct can_priv *priv = netdev_priv(dev);
83 const struct can_bittiming_const *btc = priv->bittiming_const;
84 long rate, best_rate = 0;
85 long best_error = 1000000000, error = 0;
86 int best_tseg = 0, best_brp = 0, brp = 0;
87 int tsegall, tseg = 0, tseg1 = 0, tseg2 = 0;
88 int spt_error = 1000, spt = 0, sampl_pt;
91 if (!priv->bittiming_const)
94 /* Use CIA recommended sample points */
95 if (bt->sample_point) {
96 sampl_pt = bt->sample_point;
98 if (bt->bitrate > 800000)
100 else if (bt->bitrate > 500000)
106 /* tseg even = round down, odd = round up */
107 for (tseg = (btc->tseg1_max + btc->tseg2_max) * 2 + 1;
108 tseg >= (btc->tseg1_min + btc->tseg2_min) * 2; tseg--) {
109 tsegall = 1 + tseg / 2;
110 /* Compute all possible tseg choices (tseg=tseg1+tseg2) */
111 brp = priv->clock.freq / (tsegall * bt->bitrate) + tseg % 2;
112 /* chose brp step which is possible in system */
113 brp = (brp / btc->brp_inc) * btc->brp_inc;
114 if ((brp < btc->brp_min) || (brp > btc->brp_max))
116 rate = priv->clock.freq / (brp * tsegall);
117 error = bt->bitrate - rate;
118 /* tseg brp biterror */
121 if (error > best_error)
125 spt = can_update_spt(btc, sampl_pt, tseg / 2,
127 error = sampl_pt - spt;
130 if (error > spt_error)
134 best_tseg = tseg / 2;
142 /* Error in one-tenth of a percent */
143 error = (best_error * 1000) / bt->bitrate;
144 if (error > CAN_CALC_MAX_ERROR) {
146 "bitrate error %ld.%ld%% too high\n",
147 error / 10, error % 10);
150 dev_warn(ND2D(dev), "bitrate error %ld.%ld%%\n",
151 error / 10, error % 10);
155 spt = can_update_spt(btc, sampl_pt, best_tseg, &tseg1, &tseg2);
157 v64 = (u64)best_brp * 1000000000UL;
158 do_div(v64, priv->clock.freq);
160 bt->prop_seg = tseg1 / 2;
161 bt->phase_seg1 = tseg1 - bt->prop_seg;
162 bt->phase_seg2 = tseg2;
164 /* check for sjw user settings */
165 if (!bt->sjw || !btc->sjw_max)
168 /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */
169 if (bt->sjw > btc->sjw_max)
170 bt->sjw = btc->sjw_max;
171 /* bt->sjw must not be higher than tseg2 */
177 #ifndef CONFIG_CAN_DEV_SYSFS
179 bt->bitrate = priv->clock.freq / (bt->brp * (tseg1 + tseg2 + 1));
180 /* real sample point */
181 bt->sample_point = spt;
185 #else /* !CONFIG_CAN_CALC_BITTIMING */
186 static int can_calc_bittiming(struct net_device *dev, struct can_bittiming *bt)
188 dev_err(ND2D(dev), "bit-timing calculation not available\n");
191 #endif /* CONFIG_CAN_CALC_BITTIMING */
194 #ifdef CONFIG_CAN_DEV_SYSFS
195 int can_sample_point(struct can_bittiming *bt)
197 return ((bt->prop_seg + bt->phase_seg1 + 1) * 1000) /
198 (bt->prop_seg + bt->phase_seg1 + bt->phase_seg2 + 1);
203 * Checks the validity of the specified bit-timing parameters prop_seg,
204 * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate
205 * prescaler value brp. You can find more information in the header
206 * file socketcan/can/netlink.h.
208 static int can_fixup_bittiming(struct net_device *dev, struct can_bittiming *bt)
210 struct can_priv *priv = netdev_priv(dev);
211 const struct can_bittiming_const *btc = priv->bittiming_const;
215 if (!priv->bittiming_const)
218 tseg1 = bt->prop_seg + bt->phase_seg1;
221 if (bt->sjw > btc->sjw_max ||
222 tseg1 < btc->tseg1_min || tseg1 > btc->tseg1_max ||
223 bt->phase_seg2 < btc->tseg2_min || bt->phase_seg2 > btc->tseg2_max)
226 brp64 = (u64)priv->clock.freq * (u64)bt->tq;
227 if (btc->brp_inc > 1)
228 do_div(brp64, btc->brp_inc);
229 brp64 += 500000000UL - 1;
230 do_div(brp64, 1000000000UL); /* the practicable BRP */
231 if (btc->brp_inc > 1)
232 brp64 *= btc->brp_inc;
233 bt->brp = (u32)brp64;
235 if (bt->brp < btc->brp_min || bt->brp > btc->brp_max)
238 alltseg = bt->prop_seg + bt->phase_seg1 + bt->phase_seg2 + 1;
239 bt->bitrate = priv->clock.freq / (bt->brp * alltseg);
240 bt->sample_point = ((tseg1 + 1) * 1000) / alltseg;
245 int can_get_bittiming(struct net_device *dev, struct can_bittiming *bt)
247 struct can_priv *priv = netdev_priv(dev);
250 /* Check if the CAN device has bit-timing parameters */
251 if (priv->bittiming_const) {
253 /* Non-expert mode? Check if the bitrate has been pre-defined */
255 /* Determine bit-timing parameters */
256 err = can_calc_bittiming(dev, bt);
258 /* Check bit-timing params and calculate proper brp */
259 err = can_fixup_bittiming(dev, bt);
268 * Local echo of CAN messages
270 * CAN network devices *should* support a local echo functionality
271 * (see Documentation/networking/can.txt). To test the handling of CAN
272 * interfaces that do not support the local echo both driver types are
273 * implemented. In the case that the driver does not support the echo
274 * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core
275 * to perform the echo as a fallback solution.
277 static void can_flush_echo_skb(struct net_device *dev)
279 struct can_priv *priv = netdev_priv(dev);
280 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
281 struct net_device_stats *stats = can_get_stats(dev);
283 struct net_device_stats *stats = &dev->stats;
287 for (i = 0; i < priv->echo_skb_max; i++) {
288 if (priv->echo_skb[i]) {
289 kfree_skb(priv->echo_skb[i]);
290 priv->echo_skb[i] = NULL;
292 stats->tx_aborted_errors++;
298 * Put the skb on the stack to be looped backed locally lateron
300 * The function is typically called in the start_xmit function
301 * of the device driver. The driver must protect access to
302 * priv->echo_skb, if necessary.
304 void can_put_echo_skb(struct sk_buff *skb, struct net_device *dev,
307 struct can_priv *priv = netdev_priv(dev);
309 BUG_ON(idx >= priv->echo_skb_max);
311 /* check flag whether this packet has to be looped back */
312 if (!(dev->flags & IFF_ECHO) || skb->pkt_type != PACKET_LOOPBACK) {
317 if (!priv->echo_skb[idx]) {
318 struct sock *srcsk = skb->sk;
320 if (atomic_read(&skb->users) != 1) {
321 struct sk_buff *old_skb = skb;
323 skb = skb_clone(old_skb, GFP_ATOMIC);
332 /* make settings for echo to reduce code in irq context */
333 skb->protocol = __constant_htons(ETH_P_CAN);
334 skb->pkt_type = PACKET_BROADCAST;
335 skb->ip_summed = CHECKSUM_UNNECESSARY;
338 /* save this skb for tx interrupt echo handling */
339 priv->echo_skb[idx] = skb;
341 /* locking problem with netif_stop_queue() ?? */
342 dev_err(ND2D(dev), "%s: BUG! echo_skb is occupied!\n",
347 EXPORT_SYMBOL_GPL(can_put_echo_skb);
350 * Get the skb from the stack and loop it back locally
352 * The function is typically called when the TX done interrupt
353 * is handled in the device driver. The driver must protect
354 * access to priv->echo_skb, if necessary.
356 void can_get_echo_skb(struct net_device *dev, unsigned int idx)
358 struct can_priv *priv = netdev_priv(dev);
360 BUG_ON(idx >= priv->echo_skb_max);
362 if (priv->echo_skb[idx]) {
363 netif_rx(priv->echo_skb[idx]);
364 priv->echo_skb[idx] = NULL;
367 EXPORT_SYMBOL_GPL(can_get_echo_skb);
370 * Remove the skb from the stack and free it.
372 * The function is typically called when TX failed.
374 void can_free_echo_skb(struct net_device *dev, unsigned int idx)
376 struct can_priv *priv = netdev_priv(dev);
378 BUG_ON(idx >= priv->echo_skb_max);
380 if (priv->echo_skb[idx]) {
381 kfree_skb(priv->echo_skb[idx]);
382 priv->echo_skb[idx] = NULL;
385 EXPORT_SYMBOL_GPL(can_free_echo_skb);
388 * CAN device restart for bus-off recovery
390 void can_restart(unsigned long data)
392 struct net_device *dev = (struct net_device *)data;
393 struct can_priv *priv = netdev_priv(dev);
394 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
395 struct net_device_stats *stats = can_get_stats(dev);
397 struct net_device_stats *stats = &dev->stats;
400 struct can_frame *cf;
403 BUG_ON(netif_carrier_ok(dev));
406 * No synchronization needed because the device is bus-off and
407 * no messages can come in or go out.
409 can_flush_echo_skb(dev);
411 /* send restart message upstream */
412 skb = alloc_can_err_skb(dev, &cf);
417 cf->can_id |= CAN_ERR_RESTARTED;
421 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,32)
422 dev->last_rx = jiffies;
425 stats->rx_bytes += cf->can_dlc;
428 dev_dbg(ND2D(dev), "restarted\n");
429 priv->can_stats.restarts++;
431 /* Now restart the device */
432 err = priv->do_set_mode(dev, CAN_MODE_START);
434 netif_carrier_on(dev);
436 dev_err(ND2D(dev), "Error %d during restart", err);
439 int can_restart_now(struct net_device *dev)
441 struct can_priv *priv = netdev_priv(dev);
444 * A manual restart is only permitted if automatic restart is
445 * disabled and the device is in the bus-off state
447 if (priv->restart_ms)
449 if (priv->state != CAN_STATE_BUS_OFF)
452 /* Runs as soon as possible in the timer context */
453 mod_timer(&priv->restart_timer, jiffies);
461 * This functions should be called when the device goes bus-off to
462 * tell the netif layer that no more packets can be sent or received.
463 * If enabled, a timer is started to trigger bus-off recovery.
465 void can_bus_off(struct net_device *dev)
467 struct can_priv *priv = netdev_priv(dev);
469 dev_dbg(ND2D(dev), "bus-off\n");
471 netif_carrier_off(dev);
472 priv->can_stats.bus_off++;
474 if (priv->restart_ms)
475 mod_timer(&priv->restart_timer,
476 jiffies + (priv->restart_ms * HZ) / 1000);
478 EXPORT_SYMBOL_GPL(can_bus_off);
480 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
481 struct net_device_stats *can_get_stats(struct net_device *dev)
483 struct can_priv *priv = netdev_priv(dev);
485 return &priv->net_stats;
487 EXPORT_SYMBOL_GPL(can_get_stats);
490 static void can_setup(struct net_device *dev)
492 dev->type = ARPHRD_CAN;
493 dev->mtu = sizeof(struct can_frame);
494 dev->hard_header_len = 0;
496 dev->tx_queue_len = 10;
498 /* New-style flags. */
499 dev->flags = IFF_NOARP;
500 dev->features = NETIF_F_NO_CSUM;
501 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
502 dev->get_stats = can_get_stats;
506 struct sk_buff *alloc_can_skb(struct net_device *dev, struct can_frame **cf)
510 skb = netdev_alloc_skb(dev, sizeof(struct can_frame));
514 skb->protocol = __constant_htons(ETH_P_CAN);
515 skb->pkt_type = PACKET_BROADCAST;
516 skb->ip_summed = CHECKSUM_UNNECESSARY;
517 *cf = (struct can_frame *)skb_put(skb, sizeof(struct can_frame));
518 memset(*cf, 0, sizeof(struct can_frame));
522 EXPORT_SYMBOL_GPL(alloc_can_skb);
524 struct sk_buff *alloc_can_err_skb(struct net_device *dev, struct can_frame **cf)
528 skb = alloc_can_skb(dev, cf);
532 (*cf)->can_id = CAN_ERR_FLAG;
533 (*cf)->can_dlc = CAN_ERR_DLC;
537 EXPORT_SYMBOL_GPL(alloc_can_err_skb);
540 * Allocate and setup space for the CAN network device
542 struct net_device *alloc_candev(int sizeof_priv, unsigned int echo_skb_max)
544 struct net_device *dev;
545 struct can_priv *priv;
549 size = ALIGN(sizeof_priv, sizeof(struct sk_buff *)) +
550 echo_skb_max * sizeof(struct sk_buff *);
554 dev = alloc_netdev(size, "can%d", can_setup);
558 priv = netdev_priv(dev);
561 priv->echo_skb_max = echo_skb_max;
562 priv->echo_skb = (void *)priv +
563 ALIGN(sizeof_priv, sizeof(struct sk_buff *));
566 priv->state = CAN_STATE_STOPPED;
568 init_timer(&priv->restart_timer);
572 EXPORT_SYMBOL_GPL(alloc_candev);
575 * Free space of the CAN network device
577 void free_candev(struct net_device *dev)
581 EXPORT_SYMBOL_GPL(free_candev);
583 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
584 static inline void setup_timer(struct timer_list * timer,
585 void (*function)(unsigned long),
588 timer->function = function;
595 * Common open function when the device gets opened.
597 * This function should be called in the open function of the device
600 int open_candev(struct net_device *dev)
602 struct can_priv *priv = netdev_priv(dev);
603 #ifdef CONFIG_CAN_DEV_SYSFS
607 if (!priv->bittiming.tq && !priv->bittiming.bitrate) {
608 dev_err(ND2D(dev), "bit-timing not yet defined\n");
612 #ifdef CONFIG_CAN_DEV_SYSFS
613 err = can_get_bittiming(dev, &priv->bittiming);
617 if (priv->do_set_bittiming) {
618 /* Finally, set the bit-timing registers */
619 err = priv->do_set_bittiming(dev);
625 /* Switch carrier on if device was stopped while in bus-off state */
626 if (!netif_carrier_ok(dev))
627 netif_carrier_on(dev);
629 setup_timer(&priv->restart_timer, can_restart, (unsigned long)dev);
633 EXPORT_SYMBOL_GPL(open_candev);
636 * Common close function for cleanup before the device gets closed.
638 * This function should be called in the close function of the device
641 void close_candev(struct net_device *dev)
643 struct can_priv *priv = netdev_priv(dev);
645 if (del_timer_sync(&priv->restart_timer))
647 can_flush_echo_skb(dev);
649 EXPORT_SYMBOL_GPL(close_candev);
651 #ifndef CONFIG_CAN_DEV_SYSFS
653 * CAN netlink interface
655 static const struct nla_policy can_policy[IFLA_CAN_MAX + 1] = {
656 [IFLA_CAN_STATE] = { .type = NLA_U32 },
657 [IFLA_CAN_CTRLMODE] = { .len = sizeof(struct can_ctrlmode) },
658 [IFLA_CAN_RESTART_MS] = { .type = NLA_U32 },
659 [IFLA_CAN_RESTART] = { .type = NLA_U32 },
660 [IFLA_CAN_BITTIMING] = { .len = sizeof(struct can_bittiming) },
661 [IFLA_CAN_BITTIMING_CONST]
662 = { .len = sizeof(struct can_bittiming_const) },
663 [IFLA_CAN_CLOCK] = { .len = sizeof(struct can_clock) },
664 [IFLA_CAN_BERR_COUNTER] = { .len = sizeof(struct can_berr_counter) },
667 static int can_changelink(struct net_device *dev,
668 struct nlattr *tb[], struct nlattr *data[])
670 struct can_priv *priv = netdev_priv(dev);
673 /* We need synchronization with dev->stop() */
676 if (data[IFLA_CAN_CTRLMODE]) {
677 struct can_ctrlmode *cm;
679 /* Do not allow changing controller mode while running */
680 if (dev->flags & IFF_UP)
682 cm = nla_data(data[IFLA_CAN_CTRLMODE]);
683 if (cm->flags & ~priv->ctrlmode_supported)
685 priv->ctrlmode &= ~cm->mask;
686 priv->ctrlmode |= cm->flags;
689 if (data[IFLA_CAN_BITTIMING]) {
690 struct can_bittiming bt;
692 /* Do not allow changing bittiming while running */
693 if (dev->flags & IFF_UP)
695 memcpy(&bt, nla_data(data[IFLA_CAN_BITTIMING]), sizeof(bt));
696 if ((!bt.bitrate && !bt.tq) || (bt.bitrate && bt.tq))
698 err = can_get_bittiming(dev, &bt);
701 memcpy(&priv->bittiming, &bt, sizeof(bt));
703 if (priv->do_set_bittiming) {
704 /* Finally, set the bit-timing registers */
705 err = priv->do_set_bittiming(dev);
711 if (data[IFLA_CAN_RESTART_MS]) {
712 /* Do not allow changing restart delay while running */
713 if (dev->flags & IFF_UP)
715 priv->restart_ms = nla_get_u32(data[IFLA_CAN_RESTART_MS]);
718 if (data[IFLA_CAN_RESTART]) {
719 /* Do not allow a restart while not running */
720 if (!(dev->flags & IFF_UP))
722 err = can_restart_now(dev);
730 static size_t can_get_size(const struct net_device *dev)
732 struct can_priv *priv = netdev_priv(dev);
735 size = nla_total_size(sizeof(u32)); /* IFLA_CAN_STATE */
736 size += sizeof(struct can_ctrlmode); /* IFLA_CAN_CTRLMODE */
737 size += nla_total_size(sizeof(u32)); /* IFLA_CAN_RESTART_MS */
738 size += sizeof(struct can_bittiming); /* IFLA_CAN_BITTIMING */
739 size += sizeof(struct can_clock); /* IFLA_CAN_CLOCK */
740 if (priv->do_get_berr_counter) /* IFLA_CAN_BERR_COUNTER */
741 size += sizeof(struct can_berr_counter);
742 if (priv->bittiming_const) /* IFLA_CAN_BITTIMING_CONST */
743 size += sizeof(struct can_bittiming_const);
748 static int can_fill_info(struct sk_buff *skb, const struct net_device *dev)
750 struct can_priv *priv = netdev_priv(dev);
751 struct can_ctrlmode cm = {.flags = priv->ctrlmode};
752 struct can_berr_counter bec;
753 enum can_state state = priv->state;
755 if (priv->do_get_state)
756 priv->do_get_state(dev, &state);
757 NLA_PUT_U32(skb, IFLA_CAN_STATE, state);
758 NLA_PUT(skb, IFLA_CAN_CTRLMODE, sizeof(cm), &cm);
759 NLA_PUT_U32(skb, IFLA_CAN_RESTART_MS, priv->restart_ms);
760 NLA_PUT(skb, IFLA_CAN_BITTIMING,
761 sizeof(priv->bittiming), &priv->bittiming);
762 NLA_PUT(skb, IFLA_CAN_CLOCK, sizeof(cm), &priv->clock);
763 if (priv->do_get_berr_counter && !priv->do_get_berr_counter(dev, &bec))
764 NLA_PUT(skb, IFLA_CAN_BERR_COUNTER, sizeof(bec), &bec);
765 if (priv->bittiming_const)
766 NLA_PUT(skb, IFLA_CAN_BITTIMING_CONST,
767 sizeof(*priv->bittiming_const), priv->bittiming_const);
775 static size_t can_get_xstats_size(const struct net_device *dev)
777 return sizeof(struct can_device_stats);
780 static int can_fill_xstats(struct sk_buff *skb, const struct net_device *dev)
782 struct can_priv *priv = netdev_priv(dev);
784 NLA_PUT(skb, IFLA_INFO_XSTATS,
785 sizeof(priv->can_stats), &priv->can_stats);
793 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
794 static int can_newlink(struct net_device *dev,
795 struct nlattr *tb[], struct nlattr *data[])
797 static int can_newlink(struct net *src_net, struct net_device *dev,
798 struct nlattr *tb[], struct nlattr *data[])
804 static struct rtnl_link_ops can_link_ops __read_mostly = {
806 .maxtype = IFLA_CAN_MAX,
807 .policy = can_policy,
809 .newlink = can_newlink,
810 .changelink = can_changelink,
811 .get_size = can_get_size,
812 .fill_info = can_fill_info,
813 .get_xstats_size = can_get_xstats_size,
814 .fill_xstats = can_fill_xstats,
817 #endif /* !CONFIG_CAN_DEV_SYSFS */
820 * Register the CAN network device
822 int register_candev(struct net_device *dev)
824 #ifdef CONFIG_CAN_DEV_SYSFS
827 err = register_netdev(dev);
829 can_create_sysfs(dev);
833 dev->rtnl_link_ops = &can_link_ops;
834 return register_netdev(dev);
837 EXPORT_SYMBOL_GPL(register_candev);
840 * Unregister the CAN network device
842 void unregister_candev(struct net_device *dev)
844 #ifdef CONFIG_CAN_DEV_SYSFS
845 can_remove_sysfs(dev);
847 unregister_netdev(dev);
849 EXPORT_SYMBOL_GPL(unregister_candev);
851 static __init int can_dev_init(void)
853 #ifndef CONFIG_CAN_DEV_SYSFS
856 err = rtnl_link_register(&can_link_ops);
858 printk(KERN_INFO MOD_DESC "\n");
862 printk(KERN_INFO MOD_DESC " using the deprecated SYSFS interface\n");
867 module_init(can_dev_init);
869 static __exit void can_dev_exit(void)
871 #ifndef CONFIG_CAN_DEV_SYSFS
872 rtnl_link_unregister(&can_link_ops);
875 module_exit(can_dev_exit);
877 #ifndef CONFIG_CAN_DEV_SYSFS
878 MODULE_ALIAS_RTNL_LINK("can");