can: sja1000: fix define conflict on SH
[linux-2.6.git] / drivers / net / can / sja1000 / sja1000.c
1 /*
2  * sja1000.c -  Philips SJA1000 network device driver
3  *
4  * Copyright (c) 2003 Matthias Brukner, Trajet Gmbh, Rebenring 33,
5  * 38106 Braunschweig, GERMANY
6  *
7  * Copyright (c) 2002-2007 Volkswagen Group Electronic Research
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of Volkswagen nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * Alternatively, provided that this notice is retained in full, this
23  * software may be distributed under the terms of the GNU General
24  * Public License ("GPL") version 2, in which case the provisions of the
25  * GPL apply INSTEAD OF those given above.
26  *
27  * The provided data structures and external interfaces from this code
28  * are not restricted to be used by modules with a GPL compatible license.
29  *
30  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
31  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
32  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
33  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
34  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
36  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
37  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
38  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
39  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
40  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
41  * DAMAGE.
42  *
43  */
44
45 #include <linux/module.h>
46 #include <linux/init.h>
47 #include <linux/kernel.h>
48 #include <linux/sched.h>
49 #include <linux/types.h>
50 #include <linux/fcntl.h>
51 #include <linux/interrupt.h>
52 #include <linux/ptrace.h>
53 #include <linux/string.h>
54 #include <linux/errno.h>
55 #include <linux/netdevice.h>
56 #include <linux/if_arp.h>
57 #include <linux/if_ether.h>
58 #include <linux/skbuff.h>
59 #include <linux/delay.h>
60
61 #include <linux/can/dev.h>
62 #include <linux/can/error.h>
63
64 #include "sja1000.h"
65
66 #define DRV_NAME "sja1000"
67
68 MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
69 MODULE_LICENSE("Dual BSD/GPL");
70 MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
71
72 static struct can_bittiming_const sja1000_bittiming_const = {
73         .name = DRV_NAME,
74         .tseg1_min = 1,
75         .tseg1_max = 16,
76         .tseg2_min = 1,
77         .tseg2_max = 8,
78         .sjw_max = 4,
79         .brp_min = 1,
80         .brp_max = 64,
81         .brp_inc = 1,
82 };
83
84 static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
85 {
86         unsigned long flags;
87
88         /*
89          * The command register needs some locking and time to settle
90          * the write_reg() operation - especially on SMP systems.
91          */
92         spin_lock_irqsave(&priv->cmdreg_lock, flags);
93         priv->write_reg(priv, REG_CMR, val);
94         priv->read_reg(priv, SJA1000_REG_SR);
95         spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
96 }
97
98 static int sja1000_is_absent(struct sja1000_priv *priv)
99 {
100         return (priv->read_reg(priv, REG_MOD) == 0xFF);
101 }
102
103 static int sja1000_probe_chip(struct net_device *dev)
104 {
105         struct sja1000_priv *priv = netdev_priv(dev);
106
107         if (priv->reg_base && sja1000_is_absent(priv)) {
108                 printk(KERN_INFO "%s: probing @0x%lX failed\n",
109                        DRV_NAME, dev->base_addr);
110                 return 0;
111         }
112         return -1;
113 }
114
115 static void set_reset_mode(struct net_device *dev)
116 {
117         struct sja1000_priv *priv = netdev_priv(dev);
118         unsigned char status = priv->read_reg(priv, REG_MOD);
119         int i;
120
121         /* disable interrupts */
122         priv->write_reg(priv, REG_IER, IRQ_OFF);
123
124         for (i = 0; i < 100; i++) {
125                 /* check reset bit */
126                 if (status & MOD_RM) {
127                         priv->can.state = CAN_STATE_STOPPED;
128                         return;
129                 }
130
131                 priv->write_reg(priv, REG_MOD, MOD_RM); /* reset chip */
132                 udelay(10);
133                 status = priv->read_reg(priv, REG_MOD);
134         }
135
136         netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
137 }
138
139 static void set_normal_mode(struct net_device *dev)
140 {
141         struct sja1000_priv *priv = netdev_priv(dev);
142         unsigned char status = priv->read_reg(priv, REG_MOD);
143         int i;
144
145         for (i = 0; i < 100; i++) {
146                 /* check reset bit */
147                 if ((status & MOD_RM) == 0) {
148                         priv->can.state = CAN_STATE_ERROR_ACTIVE;
149                         /* enable interrupts */
150                         if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
151                                 priv->write_reg(priv, REG_IER, IRQ_ALL);
152                         else
153                                 priv->write_reg(priv, REG_IER,
154                                                 IRQ_ALL & ~IRQ_BEI);
155                         return;
156                 }
157
158                 /* set chip to normal mode */
159                 priv->write_reg(priv, REG_MOD, 0x00);
160                 udelay(10);
161                 status = priv->read_reg(priv, REG_MOD);
162         }
163
164         netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
165 }
166
167 static void sja1000_start(struct net_device *dev)
168 {
169         struct sja1000_priv *priv = netdev_priv(dev);
170
171         /* leave reset mode */
172         if (priv->can.state != CAN_STATE_STOPPED)
173                 set_reset_mode(dev);
174
175         /* Clear error counters and error code capture */
176         priv->write_reg(priv, REG_TXERR, 0x0);
177         priv->write_reg(priv, REG_RXERR, 0x0);
178         priv->read_reg(priv, REG_ECC);
179
180         /* leave reset mode */
181         set_normal_mode(dev);
182 }
183
184 static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
185 {
186         struct sja1000_priv *priv = netdev_priv(dev);
187
188         if (!priv->open_time)
189                 return -EINVAL;
190
191         switch (mode) {
192         case CAN_MODE_START:
193                 sja1000_start(dev);
194                 if (netif_queue_stopped(dev))
195                         netif_wake_queue(dev);
196                 break;
197
198         default:
199                 return -EOPNOTSUPP;
200         }
201
202         return 0;
203 }
204
205 static int sja1000_set_bittiming(struct net_device *dev)
206 {
207         struct sja1000_priv *priv = netdev_priv(dev);
208         struct can_bittiming *bt = &priv->can.bittiming;
209         u8 btr0, btr1;
210
211         btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
212         btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
213                 (((bt->phase_seg2 - 1) & 0x7) << 4);
214         if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
215                 btr1 |= 0x80;
216
217         netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
218
219         priv->write_reg(priv, REG_BTR0, btr0);
220         priv->write_reg(priv, REG_BTR1, btr1);
221
222         return 0;
223 }
224
225 static int sja1000_get_berr_counter(const struct net_device *dev,
226                                     struct can_berr_counter *bec)
227 {
228         struct sja1000_priv *priv = netdev_priv(dev);
229
230         bec->txerr = priv->read_reg(priv, REG_TXERR);
231         bec->rxerr = priv->read_reg(priv, REG_RXERR);
232
233         return 0;
234 }
235
236 /*
237  * initialize SJA1000 chip:
238  *   - reset chip
239  *   - set output mode
240  *   - set baudrate
241  *   - enable interrupts
242  *   - start operating mode
243  */
244 static void chipset_init(struct net_device *dev)
245 {
246         struct sja1000_priv *priv = netdev_priv(dev);
247
248         /* set clock divider and output control register */
249         priv->write_reg(priv, REG_CDR, priv->cdr | CDR_PELICAN);
250
251         /* set acceptance filter (accept all) */
252         priv->write_reg(priv, REG_ACCC0, 0x00);
253         priv->write_reg(priv, REG_ACCC1, 0x00);
254         priv->write_reg(priv, REG_ACCC2, 0x00);
255         priv->write_reg(priv, REG_ACCC3, 0x00);
256
257         priv->write_reg(priv, REG_ACCM0, 0xFF);
258         priv->write_reg(priv, REG_ACCM1, 0xFF);
259         priv->write_reg(priv, REG_ACCM2, 0xFF);
260         priv->write_reg(priv, REG_ACCM3, 0xFF);
261
262         priv->write_reg(priv, REG_OCR, priv->ocr | OCR_MODE_NORMAL);
263 }
264
265 /*
266  * transmit a CAN message
267  * message layout in the sk_buff should be like this:
268  * xx xx xx xx   ff      ll   00 11 22 33 44 55 66 77
269  * [  can-id ] [flags] [len] [can data (up to 8 bytes]
270  */
271 static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
272                                             struct net_device *dev)
273 {
274         struct sja1000_priv *priv = netdev_priv(dev);
275         struct can_frame *cf = (struct can_frame *)skb->data;
276         uint8_t fi;
277         uint8_t dlc;
278         canid_t id;
279         uint8_t dreg;
280         int i;
281
282         if (can_dropped_invalid_skb(dev, skb))
283                 return NETDEV_TX_OK;
284
285         netif_stop_queue(dev);
286
287         fi = dlc = cf->can_dlc;
288         id = cf->can_id;
289
290         if (id & CAN_RTR_FLAG)
291                 fi |= FI_RTR;
292
293         if (id & CAN_EFF_FLAG) {
294                 fi |= FI_FF;
295                 dreg = EFF_BUF;
296                 priv->write_reg(priv, REG_FI, fi);
297                 priv->write_reg(priv, REG_ID1, (id & 0x1fe00000) >> (5 + 16));
298                 priv->write_reg(priv, REG_ID2, (id & 0x001fe000) >> (5 + 8));
299                 priv->write_reg(priv, REG_ID3, (id & 0x00001fe0) >> 5);
300                 priv->write_reg(priv, REG_ID4, (id & 0x0000001f) << 3);
301         } else {
302                 dreg = SFF_BUF;
303                 priv->write_reg(priv, REG_FI, fi);
304                 priv->write_reg(priv, REG_ID1, (id & 0x000007f8) >> 3);
305                 priv->write_reg(priv, REG_ID2, (id & 0x00000007) << 5);
306         }
307
308         for (i = 0; i < dlc; i++)
309                 priv->write_reg(priv, dreg++, cf->data[i]);
310
311         can_put_echo_skb(skb, dev, 0);
312
313         sja1000_write_cmdreg(priv, CMD_TR);
314
315         return NETDEV_TX_OK;
316 }
317
318 static void sja1000_rx(struct net_device *dev)
319 {
320         struct sja1000_priv *priv = netdev_priv(dev);
321         struct net_device_stats *stats = &dev->stats;
322         struct can_frame *cf;
323         struct sk_buff *skb;
324         uint8_t fi;
325         uint8_t dreg;
326         canid_t id;
327         int i;
328
329         /* create zero'ed CAN frame buffer */
330         skb = alloc_can_skb(dev, &cf);
331         if (skb == NULL)
332                 return;
333
334         fi = priv->read_reg(priv, REG_FI);
335
336         if (fi & FI_FF) {
337                 /* extended frame format (EFF) */
338                 dreg = EFF_BUF;
339                 id = (priv->read_reg(priv, REG_ID1) << (5 + 16))
340                     | (priv->read_reg(priv, REG_ID2) << (5 + 8))
341                     | (priv->read_reg(priv, REG_ID3) << 5)
342                     | (priv->read_reg(priv, REG_ID4) >> 3);
343                 id |= CAN_EFF_FLAG;
344         } else {
345                 /* standard frame format (SFF) */
346                 dreg = SFF_BUF;
347                 id = (priv->read_reg(priv, REG_ID1) << 3)
348                     | (priv->read_reg(priv, REG_ID2) >> 5);
349         }
350
351         cf->can_dlc = get_can_dlc(fi & 0x0F);
352         if (fi & FI_RTR) {
353                 id |= CAN_RTR_FLAG;
354         } else {
355                 for (i = 0; i < cf->can_dlc; i++)
356                         cf->data[i] = priv->read_reg(priv, dreg++);
357         }
358
359         cf->can_id = id;
360
361         /* release receive buffer */
362         sja1000_write_cmdreg(priv, CMD_RRB);
363
364         netif_rx(skb);
365
366         stats->rx_packets++;
367         stats->rx_bytes += cf->can_dlc;
368 }
369
370 static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
371 {
372         struct sja1000_priv *priv = netdev_priv(dev);
373         struct net_device_stats *stats = &dev->stats;
374         struct can_frame *cf;
375         struct sk_buff *skb;
376         enum can_state state = priv->can.state;
377         uint8_t ecc, alc;
378
379         skb = alloc_can_err_skb(dev, &cf);
380         if (skb == NULL)
381                 return -ENOMEM;
382
383         if (isrc & IRQ_DOI) {
384                 /* data overrun interrupt */
385                 netdev_dbg(dev, "data overrun interrupt\n");
386                 cf->can_id |= CAN_ERR_CRTL;
387                 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
388                 stats->rx_over_errors++;
389                 stats->rx_errors++;
390                 sja1000_write_cmdreg(priv, CMD_CDO);    /* clear bit */
391         }
392
393         if (isrc & IRQ_EI) {
394                 /* error warning interrupt */
395                 netdev_dbg(dev, "error warning interrupt\n");
396
397                 if (status & SR_BS) {
398                         state = CAN_STATE_BUS_OFF;
399                         cf->can_id |= CAN_ERR_BUSOFF;
400                         can_bus_off(dev);
401                 } else if (status & SR_ES) {
402                         state = CAN_STATE_ERROR_WARNING;
403                 } else
404                         state = CAN_STATE_ERROR_ACTIVE;
405         }
406         if (isrc & IRQ_BEI) {
407                 /* bus error interrupt */
408                 priv->can.can_stats.bus_error++;
409                 stats->rx_errors++;
410
411                 ecc = priv->read_reg(priv, REG_ECC);
412
413                 cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
414
415                 switch (ecc & ECC_MASK) {
416                 case ECC_BIT:
417                         cf->data[2] |= CAN_ERR_PROT_BIT;
418                         break;
419                 case ECC_FORM:
420                         cf->data[2] |= CAN_ERR_PROT_FORM;
421                         break;
422                 case ECC_STUFF:
423                         cf->data[2] |= CAN_ERR_PROT_STUFF;
424                         break;
425                 default:
426                         cf->data[2] |= CAN_ERR_PROT_UNSPEC;
427                         cf->data[3] = ecc & ECC_SEG;
428                         break;
429                 }
430                 /* Error occurred during transmission? */
431                 if ((ecc & ECC_DIR) == 0)
432                         cf->data[2] |= CAN_ERR_PROT_TX;
433         }
434         if (isrc & IRQ_EPI) {
435                 /* error passive interrupt */
436                 netdev_dbg(dev, "error passive interrupt\n");
437                 if (status & SR_ES)
438                         state = CAN_STATE_ERROR_PASSIVE;
439                 else
440                         state = CAN_STATE_ERROR_ACTIVE;
441         }
442         if (isrc & IRQ_ALI) {
443                 /* arbitration lost interrupt */
444                 netdev_dbg(dev, "arbitration lost interrupt\n");
445                 alc = priv->read_reg(priv, REG_ALC);
446                 priv->can.can_stats.arbitration_lost++;
447                 stats->tx_errors++;
448                 cf->can_id |= CAN_ERR_LOSTARB;
449                 cf->data[0] = alc & 0x1f;
450         }
451
452         if (state != priv->can.state && (state == CAN_STATE_ERROR_WARNING ||
453                                          state == CAN_STATE_ERROR_PASSIVE)) {
454                 uint8_t rxerr = priv->read_reg(priv, REG_RXERR);
455                 uint8_t txerr = priv->read_reg(priv, REG_TXERR);
456                 cf->can_id |= CAN_ERR_CRTL;
457                 if (state == CAN_STATE_ERROR_WARNING) {
458                         priv->can.can_stats.error_warning++;
459                         cf->data[1] = (txerr > rxerr) ?
460                                 CAN_ERR_CRTL_TX_WARNING :
461                                 CAN_ERR_CRTL_RX_WARNING;
462                 } else {
463                         priv->can.can_stats.error_passive++;
464                         cf->data[1] = (txerr > rxerr) ?
465                                 CAN_ERR_CRTL_TX_PASSIVE :
466                                 CAN_ERR_CRTL_RX_PASSIVE;
467                 }
468                 cf->data[6] = txerr;
469                 cf->data[7] = rxerr;
470         }
471
472         priv->can.state = state;
473
474         netif_rx(skb);
475
476         stats->rx_packets++;
477         stats->rx_bytes += cf->can_dlc;
478
479         return 0;
480 }
481
482 irqreturn_t sja1000_interrupt(int irq, void *dev_id)
483 {
484         struct net_device *dev = (struct net_device *)dev_id;
485         struct sja1000_priv *priv = netdev_priv(dev);
486         struct net_device_stats *stats = &dev->stats;
487         uint8_t isrc, status;
488         int n = 0;
489
490         /* Shared interrupts and IRQ off? */
491         if (priv->read_reg(priv, REG_IER) == IRQ_OFF)
492                 return IRQ_NONE;
493
494         if (priv->pre_irq)
495                 priv->pre_irq(priv);
496
497         while ((isrc = priv->read_reg(priv, REG_IR)) && (n < SJA1000_MAX_IRQ)) {
498                 n++;
499                 status = priv->read_reg(priv, SJA1000_REG_SR);
500                 /* check for absent controller due to hw unplug */
501                 if (status == 0xFF && sja1000_is_absent(priv))
502                         return IRQ_NONE;
503
504                 if (isrc & IRQ_WUI)
505                         netdev_warn(dev, "wakeup interrupt\n");
506
507                 if (isrc & IRQ_TI) {
508                         /* transmission complete interrupt */
509                         stats->tx_bytes += priv->read_reg(priv, REG_FI) & 0xf;
510                         stats->tx_packets++;
511                         can_get_echo_skb(dev, 0);
512                         netif_wake_queue(dev);
513                 }
514                 if (isrc & IRQ_RI) {
515                         /* receive interrupt */
516                         while (status & SR_RBS) {
517                                 sja1000_rx(dev);
518                                 status = priv->read_reg(priv, SJA1000_REG_SR);
519                                 /* check for absent controller */
520                                 if (status == 0xFF && sja1000_is_absent(priv))
521                                         return IRQ_NONE;
522                         }
523                 }
524                 if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
525                         /* error interrupt */
526                         if (sja1000_err(dev, isrc, status))
527                                 break;
528                 }
529         }
530
531         if (priv->post_irq)
532                 priv->post_irq(priv);
533
534         if (n >= SJA1000_MAX_IRQ)
535                 netdev_dbg(dev, "%d messages handled in ISR", n);
536
537         return (n) ? IRQ_HANDLED : IRQ_NONE;
538 }
539 EXPORT_SYMBOL_GPL(sja1000_interrupt);
540
541 static int sja1000_open(struct net_device *dev)
542 {
543         struct sja1000_priv *priv = netdev_priv(dev);
544         int err;
545
546         /* set chip into reset mode */
547         set_reset_mode(dev);
548
549         /* common open */
550         err = open_candev(dev);
551         if (err)
552                 return err;
553
554         /* register interrupt handler, if not done by the device driver */
555         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
556                 err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
557                                   dev->name, (void *)dev);
558                 if (err) {
559                         close_candev(dev);
560                         return -EAGAIN;
561                 }
562         }
563
564         /* init and start chi */
565         sja1000_start(dev);
566         priv->open_time = jiffies;
567
568         netif_start_queue(dev);
569
570         return 0;
571 }
572
573 static int sja1000_close(struct net_device *dev)
574 {
575         struct sja1000_priv *priv = netdev_priv(dev);
576
577         netif_stop_queue(dev);
578         set_reset_mode(dev);
579
580         if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
581                 free_irq(dev->irq, (void *)dev);
582
583         close_candev(dev);
584
585         priv->open_time = 0;
586
587         return 0;
588 }
589
590 struct net_device *alloc_sja1000dev(int sizeof_priv)
591 {
592         struct net_device *dev;
593         struct sja1000_priv *priv;
594
595         dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
596                 SJA1000_ECHO_SKB_MAX);
597         if (!dev)
598                 return NULL;
599
600         priv = netdev_priv(dev);
601
602         priv->dev = dev;
603         priv->can.bittiming_const = &sja1000_bittiming_const;
604         priv->can.do_set_bittiming = sja1000_set_bittiming;
605         priv->can.do_set_mode = sja1000_set_mode;
606         priv->can.do_get_berr_counter = sja1000_get_berr_counter;
607         priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
608                 CAN_CTRLMODE_BERR_REPORTING;
609
610         spin_lock_init(&priv->cmdreg_lock);
611
612         if (sizeof_priv)
613                 priv->priv = (void *)priv + sizeof(struct sja1000_priv);
614
615         return dev;
616 }
617 EXPORT_SYMBOL_GPL(alloc_sja1000dev);
618
619 void free_sja1000dev(struct net_device *dev)
620 {
621         free_candev(dev);
622 }
623 EXPORT_SYMBOL_GPL(free_sja1000dev);
624
625 static const struct net_device_ops sja1000_netdev_ops = {
626        .ndo_open               = sja1000_open,
627        .ndo_stop               = sja1000_close,
628        .ndo_start_xmit         = sja1000_start_xmit,
629 };
630
631 int register_sja1000dev(struct net_device *dev)
632 {
633         if (!sja1000_probe_chip(dev))
634                 return -ENODEV;
635
636         dev->flags |= IFF_ECHO; /* we support local echo */
637         dev->netdev_ops = &sja1000_netdev_ops;
638
639         set_reset_mode(dev);
640         chipset_init(dev);
641
642         return register_candev(dev);
643 }
644 EXPORT_SYMBOL_GPL(register_sja1000dev);
645
646 void unregister_sja1000dev(struct net_device *dev)
647 {
648         set_reset_mode(dev);
649         unregister_candev(dev);
650 }
651 EXPORT_SYMBOL_GPL(unregister_sja1000dev);
652
653 static __init int sja1000_init(void)
654 {
655         printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
656
657         return 0;
658 }
659
660 module_init(sja1000_init);
661
662 static __exit void sja1000_exit(void)
663 {
664         printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
665 }
666
667 module_exit(sja1000_exit);