2 * Copyright (C) 2005 Marc Kleine-Budde, Pengutronix
3 * Copyright (C) 2006 Andrey Volkov, Varma Electronics
4 * Copyright (C) 2008-2009 Wolfgang Grandegger <wg@grandegger.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the version 2 of the GNU General Public License
8 * as published by the Free Software Foundation
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/module.h>
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/netdevice.h>
24 #include <linux/if_arp.h>
25 #include <linux/workqueue.h>
26 #include <linux/can.h>
27 #include <linux/can/dev.h>
28 #include <linux/can/skb.h>
29 #include <linux/can/netlink.h>
30 #include <linux/can/led.h>
31 #include <net/rtnetlink.h>
33 #define MOD_DESC "CAN device driver interface"
35 MODULE_DESCRIPTION(MOD_DESC
);
36 MODULE_LICENSE("GPL v2");
37 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
39 /* CAN DLC to real data length conversion helpers */
41 static const u8 dlc2len
[] = {0, 1, 2, 3, 4, 5, 6, 7,
42 8, 12, 16, 20, 24, 32, 48, 64};
44 /* get data length from can_dlc with sanitized can_dlc */
45 u8
can_dlc2len(u8 can_dlc
)
47 return dlc2len
[can_dlc
& 0x0F];
49 EXPORT_SYMBOL_GPL(can_dlc2len
);
51 static const u8 len2dlc
[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */
52 9, 9, 9, 9, /* 9 - 12 */
53 10, 10, 10, 10, /* 13 - 16 */
54 11, 11, 11, 11, /* 17 - 20 */
55 12, 12, 12, 12, /* 21 - 24 */
56 13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */
57 14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */
58 14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */
59 15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */
60 15, 15, 15, 15, 15, 15, 15, 15}; /* 57 - 64 */
62 /* map the sanitized data length to an appropriate data length code */
63 u8
can_len2dlc(u8 len
)
65 if (unlikely(len
> 64))
70 EXPORT_SYMBOL_GPL(can_len2dlc
);
72 #ifdef CONFIG_CAN_CALC_BITTIMING
73 #define CAN_CALC_MAX_ERROR 50 /* in one-tenth of a percent */
76 * Bit-timing calculation derived from:
78 * Code based on LinCAN sources and H8S2638 project
79 * Copyright 2004-2006 Pavel Pisa - DCE FELK CVUT cz
80 * Copyright 2005 Stanislav Marek
81 * email: pisa@cmp.felk.cvut.cz
83 * Calculates proper bit-timing parameters for a specified bit-rate
84 * and sample-point, which can then be used to set the bit-timing
85 * registers of the CAN controller. You can find more information
86 * in the header file linux/can/netlink.h.
88 static int can_update_spt(const struct can_bittiming_const
*btc
,
89 int sampl_pt
, int tseg
, int *tseg1
, int *tseg2
)
91 *tseg2
= tseg
+ 1 - (sampl_pt
* (tseg
+ 1)) / 1000;
92 if (*tseg2
< btc
->tseg2_min
)
93 *tseg2
= btc
->tseg2_min
;
94 if (*tseg2
> btc
->tseg2_max
)
95 *tseg2
= btc
->tseg2_max
;
96 *tseg1
= tseg
- *tseg2
;
97 if (*tseg1
> btc
->tseg1_max
) {
98 *tseg1
= btc
->tseg1_max
;
99 *tseg2
= tseg
- *tseg1
;
101 return 1000 * (tseg
+ 1 - *tseg2
) / (tseg
+ 1);
104 static int can_calc_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
106 struct can_priv
*priv
= netdev_priv(dev
);
107 const struct can_bittiming_const
*btc
= priv
->bittiming_const
;
108 long rate
, best_rate
= 0;
109 long best_error
= 1000000000, error
= 0;
110 int best_tseg
= 0, best_brp
= 0, brp
= 0;
111 int tsegall
, tseg
= 0, tseg1
= 0, tseg2
= 0;
112 int spt_error
= 1000, spt
= 0, sampl_pt
;
115 if (!priv
->bittiming_const
)
118 /* Use CIA recommended sample points */
119 if (bt
->sample_point
) {
120 sampl_pt
= bt
->sample_point
;
122 if (bt
->bitrate
> 800000)
124 else if (bt
->bitrate
> 500000)
130 /* tseg even = round down, odd = round up */
131 for (tseg
= (btc
->tseg1_max
+ btc
->tseg2_max
) * 2 + 1;
132 tseg
>= (btc
->tseg1_min
+ btc
->tseg2_min
) * 2; tseg
--) {
133 tsegall
= 1 + tseg
/ 2;
134 /* Compute all possible tseg choices (tseg=tseg1+tseg2) */
135 brp
= priv
->clock
.freq
/ (tsegall
* bt
->bitrate
) + tseg
% 2;
136 /* chose brp step which is possible in system */
137 brp
= (brp
/ btc
->brp_inc
) * btc
->brp_inc
;
138 if ((brp
< btc
->brp_min
) || (brp
> btc
->brp_max
))
140 rate
= priv
->clock
.freq
/ (brp
* tsegall
);
141 error
= bt
->bitrate
- rate
;
142 /* tseg brp biterror */
145 if (error
> best_error
)
149 spt
= can_update_spt(btc
, sampl_pt
, tseg
/ 2,
151 error
= sampl_pt
- spt
;
154 if (error
> spt_error
)
158 best_tseg
= tseg
/ 2;
166 /* Error in one-tenth of a percent */
167 error
= (best_error
* 1000) / bt
->bitrate
;
168 if (error
> CAN_CALC_MAX_ERROR
) {
170 "bitrate error %ld.%ld%% too high\n",
171 error
/ 10, error
% 10);
174 netdev_warn(dev
, "bitrate error %ld.%ld%%\n",
175 error
/ 10, error
% 10);
179 /* real sample point */
180 bt
->sample_point
= can_update_spt(btc
, sampl_pt
, best_tseg
,
183 v64
= (u64
)best_brp
* 1000000000UL;
184 do_div(v64
, priv
->clock
.freq
);
186 bt
->prop_seg
= tseg1
/ 2;
187 bt
->phase_seg1
= tseg1
- bt
->prop_seg
;
188 bt
->phase_seg2
= tseg2
;
190 /* check for sjw user settings */
191 if (!bt
->sjw
|| !btc
->sjw_max
)
194 /* bt->sjw is at least 1 -> sanitize upper bound to sjw_max */
195 if (bt
->sjw
> btc
->sjw_max
)
196 bt
->sjw
= btc
->sjw_max
;
197 /* bt->sjw must not be higher than tseg2 */
204 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* (tseg1
+ tseg2
+ 1));
208 #else /* !CONFIG_CAN_CALC_BITTIMING */
209 static int can_calc_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
211 netdev_err(dev
, "bit-timing calculation not available\n");
214 #endif /* CONFIG_CAN_CALC_BITTIMING */
217 * Checks the validity of the specified bit-timing parameters prop_seg,
218 * phase_seg1, phase_seg2 and sjw and tries to determine the bitrate
219 * prescaler value brp. You can find more information in the header
220 * file linux/can/netlink.h.
222 static int can_fixup_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
224 struct can_priv
*priv
= netdev_priv(dev
);
225 const struct can_bittiming_const
*btc
= priv
->bittiming_const
;
229 if (!priv
->bittiming_const
)
232 tseg1
= bt
->prop_seg
+ bt
->phase_seg1
;
235 if (bt
->sjw
> btc
->sjw_max
||
236 tseg1
< btc
->tseg1_min
|| tseg1
> btc
->tseg1_max
||
237 bt
->phase_seg2
< btc
->tseg2_min
|| bt
->phase_seg2
> btc
->tseg2_max
)
240 brp64
= (u64
)priv
->clock
.freq
* (u64
)bt
->tq
;
241 if (btc
->brp_inc
> 1)
242 do_div(brp64
, btc
->brp_inc
);
243 brp64
+= 500000000UL - 1;
244 do_div(brp64
, 1000000000UL); /* the practicable BRP */
245 if (btc
->brp_inc
> 1)
246 brp64
*= btc
->brp_inc
;
247 bt
->brp
= (u32
)brp64
;
249 if (bt
->brp
< btc
->brp_min
|| bt
->brp
> btc
->brp_max
)
252 alltseg
= bt
->prop_seg
+ bt
->phase_seg1
+ bt
->phase_seg2
+ 1;
253 bt
->bitrate
= priv
->clock
.freq
/ (bt
->brp
* alltseg
);
254 bt
->sample_point
= ((tseg1
+ 1) * 1000) / alltseg
;
259 static int can_get_bittiming(struct net_device
*dev
, struct can_bittiming
*bt
)
261 struct can_priv
*priv
= netdev_priv(dev
);
264 /* Check if the CAN device has bit-timing parameters */
265 if (priv
->bittiming_const
) {
267 /* Non-expert mode? Check if the bitrate has been pre-defined */
269 /* Determine bit-timing parameters */
270 err
= can_calc_bittiming(dev
, bt
);
272 /* Check bit-timing params and calculate proper brp */
273 err
= can_fixup_bittiming(dev
, bt
);
282 * Local echo of CAN messages
284 * CAN network devices *should* support a local echo functionality
285 * (see Documentation/networking/can.txt). To test the handling of CAN
286 * interfaces that do not support the local echo both driver types are
287 * implemented. In the case that the driver does not support the echo
288 * the IFF_ECHO remains clear in dev->flags. This causes the PF_CAN core
289 * to perform the echo as a fallback solution.
291 static void can_flush_echo_skb(struct net_device
*dev
)
293 struct can_priv
*priv
= netdev_priv(dev
);
294 struct net_device_stats
*stats
= &dev
->stats
;
297 for (i
= 0; i
< priv
->echo_skb_max
; i
++) {
298 if (priv
->echo_skb
[i
]) {
299 kfree_skb(priv
->echo_skb
[i
]);
300 priv
->echo_skb
[i
] = NULL
;
302 stats
->tx_aborted_errors
++;
308 * Put the skb on the stack to be looped backed locally lateron
310 * The function is typically called in the start_xmit function
311 * of the device driver. The driver must protect access to
312 * priv->echo_skb, if necessary.
314 void can_put_echo_skb(struct sk_buff
*skb
, struct net_device
*dev
,
317 struct can_priv
*priv
= netdev_priv(dev
);
319 BUG_ON(idx
>= priv
->echo_skb_max
);
321 /* check flag whether this packet has to be looped back */
322 if (!(dev
->flags
& IFF_ECHO
) || skb
->pkt_type
!= PACKET_LOOPBACK
) {
327 if (!priv
->echo_skb
[idx
]) {
329 skb
= can_create_echo_skb(skb
);
333 /* make settings for echo to reduce code in irq context */
334 skb
->protocol
= htons(ETH_P_CAN
);
335 skb
->pkt_type
= PACKET_BROADCAST
;
336 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
339 /* save this skb for tx interrupt echo handling */
340 priv
->echo_skb
[idx
] = skb
;
342 /* locking problem with netif_stop_queue() ?? */
343 netdev_err(dev
, "%s: BUG! echo_skb is occupied!\n", __func__
);
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 unsigned int 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 struct sk_buff
*skb
= priv
->echo_skb
[idx
];
364 struct can_frame
*cf
= (struct can_frame
*)skb
->data
;
365 u8 dlc
= cf
->can_dlc
;
367 netif_rx(priv
->echo_skb
[idx
]);
368 priv
->echo_skb
[idx
] = NULL
;
375 EXPORT_SYMBOL_GPL(can_get_echo_skb
);
378 * Remove the skb from the stack and free it.
380 * The function is typically called when TX failed.
382 void can_free_echo_skb(struct net_device
*dev
, unsigned int idx
)
384 struct can_priv
*priv
= netdev_priv(dev
);
386 BUG_ON(idx
>= priv
->echo_skb_max
);
388 if (priv
->echo_skb
[idx
]) {
389 dev_kfree_skb_any(priv
->echo_skb
[idx
]);
390 priv
->echo_skb
[idx
] = NULL
;
393 EXPORT_SYMBOL_GPL(can_free_echo_skb
);
396 * CAN device restart for bus-off recovery
398 static void can_restart(struct net_device
*dev
)
400 struct can_priv
*priv
= netdev_priv(dev
);
401 struct net_device_stats
*stats
= &dev
->stats
;
403 struct can_frame
*cf
;
406 BUG_ON(netif_carrier_ok(dev
));
409 * No synchronization needed because the device is bus-off and
410 * no messages can come in or go out.
412 can_flush_echo_skb(dev
);
414 /* send restart message upstream */
415 skb
= alloc_can_err_skb(dev
, &cf
);
420 cf
->can_id
|= CAN_ERR_RESTARTED
;
425 stats
->rx_bytes
+= cf
->can_dlc
;
428 netdev_dbg(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 netdev_err(dev
, "Error %d during restart", err
);
439 static void can_restart_work(struct work_struct
*work
)
441 struct delayed_work
*dwork
= to_delayed_work(work
);
442 struct can_priv
*priv
= container_of(dwork
, struct can_priv
, restart_work
);
444 can_restart(priv
->dev
);
447 int can_restart_now(struct net_device
*dev
)
449 struct can_priv
*priv
= netdev_priv(dev
);
452 * A manual restart is only permitted if automatic restart is
453 * disabled and the device is in the bus-off state
455 if (priv
->restart_ms
)
457 if (priv
->state
!= CAN_STATE_BUS_OFF
)
460 cancel_delayed_work_sync(&priv
->restart_work
);
469 * This functions should be called when the device goes bus-off to
470 * tell the netif layer that no more packets can be sent or received.
471 * If enabled, a timer is started to trigger bus-off recovery.
473 void can_bus_off(struct net_device
*dev
)
475 struct can_priv
*priv
= netdev_priv(dev
);
477 netdev_dbg(dev
, "bus-off\n");
479 netif_carrier_off(dev
);
480 priv
->can_stats
.bus_off
++;
482 if (priv
->restart_ms
)
483 schedule_delayed_work(&priv
->restart_work
,
484 msecs_to_jiffies(priv
->restart_ms
));
486 EXPORT_SYMBOL_GPL(can_bus_off
);
488 static void can_setup(struct net_device
*dev
)
490 dev
->type
= ARPHRD_CAN
;
492 dev
->hard_header_len
= 0;
494 dev
->tx_queue_len
= 10;
496 /* New-style flags. */
497 dev
->flags
= IFF_NOARP
;
498 dev
->features
= NETIF_F_HW_CSUM
;
501 struct sk_buff
*alloc_can_skb(struct net_device
*dev
, struct can_frame
**cf
)
505 skb
= netdev_alloc_skb(dev
, sizeof(struct can_skb_priv
) +
506 sizeof(struct can_frame
));
510 skb
->protocol
= htons(ETH_P_CAN
);
511 skb
->pkt_type
= PACKET_BROADCAST
;
512 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
514 skb_reset_mac_header(skb
);
515 skb_reset_network_header(skb
);
516 skb_reset_transport_header(skb
);
518 skb_reset_mac_header(skb
);
519 skb_reset_network_header(skb
);
520 skb_reset_transport_header(skb
);
522 can_skb_reserve(skb
);
523 can_skb_prv(skb
)->ifindex
= dev
->ifindex
;
525 *cf
= (struct can_frame
*)skb_put(skb
, sizeof(struct can_frame
));
526 memset(*cf
, 0, sizeof(struct can_frame
));
530 EXPORT_SYMBOL_GPL(alloc_can_skb
);
532 struct sk_buff
*alloc_can_err_skb(struct net_device
*dev
, struct can_frame
**cf
)
536 skb
= alloc_can_skb(dev
, cf
);
540 (*cf
)->can_id
= CAN_ERR_FLAG
;
541 (*cf
)->can_dlc
= CAN_ERR_DLC
;
545 EXPORT_SYMBOL_GPL(alloc_can_err_skb
);
548 * Allocate and setup space for the CAN network device
550 struct net_device
*alloc_candev(int sizeof_priv
, unsigned int echo_skb_max
)
552 struct net_device
*dev
;
553 struct can_priv
*priv
;
557 size
= ALIGN(sizeof_priv
, sizeof(struct sk_buff
*)) +
558 echo_skb_max
* sizeof(struct sk_buff
*);
562 dev
= alloc_netdev(size
, "can%d", can_setup
);
566 priv
= netdev_priv(dev
);
570 priv
->echo_skb_max
= echo_skb_max
;
571 priv
->echo_skb
= (void *)priv
+
572 ALIGN(sizeof_priv
, sizeof(struct sk_buff
*));
575 priv
->state
= CAN_STATE_STOPPED
;
577 INIT_DELAYED_WORK(&priv
->restart_work
, can_restart_work
);
581 EXPORT_SYMBOL_GPL(alloc_candev
);
584 * Free space of the CAN network device
586 void free_candev(struct net_device
*dev
)
590 EXPORT_SYMBOL_GPL(free_candev
);
593 * Common open function when the device gets opened.
595 * This function should be called in the open function of the device
598 int open_candev(struct net_device
*dev
)
600 struct can_priv
*priv
= netdev_priv(dev
);
602 if (!priv
->bittiming
.tq
&& !priv
->bittiming
.bitrate
) {
603 netdev_err(dev
, "bit-timing not yet defined\n");
607 /* Switch carrier on if device was stopped while in bus-off state */
608 if (!netif_carrier_ok(dev
))
609 netif_carrier_on(dev
);
613 EXPORT_SYMBOL_GPL(open_candev
);
616 * Common close function for cleanup before the device gets closed.
618 * This function should be called in the close function of the device
621 void close_candev(struct net_device
*dev
)
623 struct can_priv
*priv
= netdev_priv(dev
);
625 cancel_delayed_work_sync(&priv
->restart_work
);
626 can_flush_echo_skb(dev
);
628 EXPORT_SYMBOL_GPL(close_candev
);
631 * CAN netlink interface
633 static const struct nla_policy can_policy
[IFLA_CAN_MAX
+ 1] = {
634 [IFLA_CAN_STATE
] = { .type
= NLA_U32
},
635 [IFLA_CAN_CTRLMODE
] = { .len
= sizeof(struct can_ctrlmode
) },
636 [IFLA_CAN_RESTART_MS
] = { .type
= NLA_U32
},
637 [IFLA_CAN_RESTART
] = { .type
= NLA_U32
},
638 [IFLA_CAN_BITTIMING
] = { .len
= sizeof(struct can_bittiming
) },
639 [IFLA_CAN_BITTIMING_CONST
]
640 = { .len
= sizeof(struct can_bittiming_const
) },
641 [IFLA_CAN_CLOCK
] = { .len
= sizeof(struct can_clock
) },
642 [IFLA_CAN_BERR_COUNTER
] = { .len
= sizeof(struct can_berr_counter
) },
645 static int can_changelink(struct net_device
*dev
,
646 struct nlattr
*tb
[], struct nlattr
*data
[])
648 struct can_priv
*priv
= netdev_priv(dev
);
651 /* We need synchronization with dev->stop() */
654 if (data
[IFLA_CAN_CTRLMODE
]) {
655 struct can_ctrlmode
*cm
;
657 /* Do not allow changing controller mode while running */
658 if (dev
->flags
& IFF_UP
)
660 cm
= nla_data(data
[IFLA_CAN_CTRLMODE
]);
662 /* check whether changed bits are allowed to be modified */
663 if (cm
->mask
& ~priv
->ctrlmode_supported
)
666 /* clear bits to be modified and copy the flag values */
667 priv
->ctrlmode
&= ~cm
->mask
;
668 priv
->ctrlmode
|= (cm
->flags
& cm
->mask
);
671 if (data
[IFLA_CAN_BITTIMING
]) {
672 struct can_bittiming bt
;
674 /* Do not allow changing bittiming while running */
675 if (dev
->flags
& IFF_UP
)
677 memcpy(&bt
, nla_data(data
[IFLA_CAN_BITTIMING
]), sizeof(bt
));
678 if ((!bt
.bitrate
&& !bt
.tq
) || (bt
.bitrate
&& bt
.tq
))
680 err
= can_get_bittiming(dev
, &bt
);
683 memcpy(&priv
->bittiming
, &bt
, sizeof(bt
));
685 if (priv
->do_set_bittiming
) {
686 /* Finally, set the bit-timing registers */
687 err
= priv
->do_set_bittiming(dev
);
693 if (data
[IFLA_CAN_RESTART_MS
]) {
694 /* Do not allow changing restart delay while running */
695 if (dev
->flags
& IFF_UP
)
697 priv
->restart_ms
= nla_get_u32(data
[IFLA_CAN_RESTART_MS
]);
700 if (data
[IFLA_CAN_RESTART
]) {
701 /* Do not allow a restart while not running */
702 if (!(dev
->flags
& IFF_UP
))
704 err
= can_restart_now(dev
);
712 static size_t can_get_size(const struct net_device
*dev
)
714 struct can_priv
*priv
= netdev_priv(dev
);
717 size
= nla_total_size(sizeof(u32
)); /* IFLA_CAN_STATE */
718 size
+= nla_total_size(sizeof(struct can_ctrlmode
)); /* IFLA_CAN_CTRLMODE */
719 size
+= nla_total_size(sizeof(u32
)); /* IFLA_CAN_RESTART_MS */
720 size
+= nla_total_size(sizeof(struct can_bittiming
)); /* IFLA_CAN_BITTIMING */
721 size
+= nla_total_size(sizeof(struct can_clock
)); /* IFLA_CAN_CLOCK */
722 if (priv
->do_get_berr_counter
) /* IFLA_CAN_BERR_COUNTER */
723 size
+= nla_total_size(sizeof(struct can_berr_counter
));
724 if (priv
->bittiming_const
) /* IFLA_CAN_BITTIMING_CONST */
725 size
+= nla_total_size(sizeof(struct can_bittiming_const
));
730 static int can_fill_info(struct sk_buff
*skb
, const struct net_device
*dev
)
732 struct can_priv
*priv
= netdev_priv(dev
);
733 struct can_ctrlmode cm
= {.flags
= priv
->ctrlmode
};
734 struct can_berr_counter bec
;
735 enum can_state state
= priv
->state
;
737 if (priv
->do_get_state
)
738 priv
->do_get_state(dev
, &state
);
739 if (nla_put_u32(skb
, IFLA_CAN_STATE
, state
) ||
740 nla_put(skb
, IFLA_CAN_CTRLMODE
, sizeof(cm
), &cm
) ||
741 nla_put_u32(skb
, IFLA_CAN_RESTART_MS
, priv
->restart_ms
) ||
742 nla_put(skb
, IFLA_CAN_BITTIMING
,
743 sizeof(priv
->bittiming
), &priv
->bittiming
) ||
744 nla_put(skb
, IFLA_CAN_CLOCK
, sizeof(cm
), &priv
->clock
) ||
745 (priv
->do_get_berr_counter
&&
746 !priv
->do_get_berr_counter(dev
, &bec
) &&
747 nla_put(skb
, IFLA_CAN_BERR_COUNTER
, sizeof(bec
), &bec
)) ||
748 (priv
->bittiming_const
&&
749 nla_put(skb
, IFLA_CAN_BITTIMING_CONST
,
750 sizeof(*priv
->bittiming_const
), priv
->bittiming_const
)))
751 goto nla_put_failure
;
758 static size_t can_get_xstats_size(const struct net_device
*dev
)
760 return sizeof(struct can_device_stats
);
763 static int can_fill_xstats(struct sk_buff
*skb
, const struct net_device
*dev
)
765 struct can_priv
*priv
= netdev_priv(dev
);
767 if (nla_put(skb
, IFLA_INFO_XSTATS
,
768 sizeof(priv
->can_stats
), &priv
->can_stats
))
769 goto nla_put_failure
;
776 static int can_newlink(struct net
*src_net
, struct net_device
*dev
,
777 struct nlattr
*tb
[], struct nlattr
*data
[])
782 static void can_dellink(struct net_device
*dev
, struct list_head
*head
)
787 static struct rtnl_link_ops can_link_ops __read_mostly
= {
789 .maxtype
= IFLA_CAN_MAX
,
790 .policy
= can_policy
,
792 .newlink
= can_newlink
,
793 .changelink
= can_changelink
,
794 .dellink
= can_dellink
,
795 .get_size
= can_get_size
,
796 .fill_info
= can_fill_info
,
797 .get_xstats_size
= can_get_xstats_size
,
798 .fill_xstats
= can_fill_xstats
,
802 * Register the CAN network device
804 int register_candev(struct net_device
*dev
)
806 dev
->rtnl_link_ops
= &can_link_ops
;
807 return register_netdev(dev
);
809 EXPORT_SYMBOL_GPL(register_candev
);
812 * Unregister the CAN network device
814 void unregister_candev(struct net_device
*dev
)
816 unregister_netdev(dev
);
818 EXPORT_SYMBOL_GPL(unregister_candev
);
821 * Test if a network device is a candev based device
822 * and return the can_priv* if so.
824 struct can_priv
*safe_candev_priv(struct net_device
*dev
)
826 if ((dev
->type
!= ARPHRD_CAN
) || (dev
->rtnl_link_ops
!= &can_link_ops
))
829 return netdev_priv(dev
);
831 EXPORT_SYMBOL_GPL(safe_candev_priv
);
833 static __init
int can_dev_init(void)
837 can_led_notifier_init();
839 err
= rtnl_link_register(&can_link_ops
);
841 printk(KERN_INFO MOD_DESC
"\n");
845 module_init(can_dev_init
);
847 static __exit
void can_dev_exit(void)
849 rtnl_link_unregister(&can_link_ops
);
851 can_led_notifier_exit();
853 module_exit(can_dev_exit
);
855 MODULE_ALIAS_RTNL_LINK("can");