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#include <linux/can/led.h>
64
65#include "sja1000.h"
66
67#define DRV_NAME "sja1000"
68
69MODULE_AUTHOR("Oliver Hartkopp <oliver.hartkopp@volkswagen.de>");
70MODULE_LICENSE("Dual BSD/GPL");
71MODULE_DESCRIPTION(DRV_NAME "CAN netdevice driver");
72
73static const struct can_bittiming_const sja1000_bittiming_const = {
74	.name = DRV_NAME,
75	.tseg1_min = 1,
76	.tseg1_max = 16,
77	.tseg2_min = 1,
78	.tseg2_max = 8,
79	.sjw_max = 4,
80	.brp_min = 1,
81	.brp_max = 64,
82	.brp_inc = 1,
83};
84
85static void sja1000_write_cmdreg(struct sja1000_priv *priv, u8 val)
86{
87	unsigned long flags;
88
89	/*
90	 * The command register needs some locking and time to settle
91	 * the write_reg() operation - especially on SMP systems.
92	 */
93	spin_lock_irqsave(&priv->cmdreg_lock, flags);
94	priv->write_reg(priv, SJA1000_CMR, val);
95	priv->read_reg(priv, SJA1000_SR);
96	spin_unlock_irqrestore(&priv->cmdreg_lock, flags);
97}
98
99static int sja1000_is_absent(struct sja1000_priv *priv)
100{
101	return (priv->read_reg(priv, SJA1000_MOD) == 0xFF);
102}
103
104static int sja1000_probe_chip(struct net_device *dev)
105{
106	struct sja1000_priv *priv = netdev_priv(dev);
107
108	if (priv->reg_base && sja1000_is_absent(priv)) {
109		netdev_err(dev, "probing failed\n");
110		return 0;
111	}
112	return -1;
113}
114
115static 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, SJA1000_MOD);
119	int i;
120
121	/* disable interrupts */
122	priv->write_reg(priv, SJA1000_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		/* reset chip */
132		priv->write_reg(priv, SJA1000_MOD, MOD_RM);
133		udelay(10);
134		status = priv->read_reg(priv, SJA1000_MOD);
135	}
136
137	netdev_err(dev, "setting SJA1000 into reset mode failed!\n");
138}
139
140static void set_normal_mode(struct net_device *dev)
141{
142	struct sja1000_priv *priv = netdev_priv(dev);
143	unsigned char status = priv->read_reg(priv, SJA1000_MOD);
144	u8 mod_reg_val = 0x00;
145	int i;
146
147	for (i = 0; i < 100; i++) {
148		/* check reset bit */
149		if ((status & MOD_RM) == 0) {
150			priv->can.state = CAN_STATE_ERROR_ACTIVE;
151			/* enable interrupts */
152			if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
153				priv->write_reg(priv, SJA1000_IER, IRQ_ALL);
154			else
155				priv->write_reg(priv, SJA1000_IER,
156						IRQ_ALL & ~IRQ_BEI);
157			return;
158		}
159
160		/* set chip to normal mode */
161		if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
162			mod_reg_val |= MOD_LOM;
163		if (priv->can.ctrlmode & CAN_CTRLMODE_PRESUME_ACK)
164			mod_reg_val |= MOD_STM;
165		priv->write_reg(priv, SJA1000_MOD, mod_reg_val);
166
167		udelay(10);
168
169		status = priv->read_reg(priv, SJA1000_MOD);
170	}
171
172	netdev_err(dev, "setting SJA1000 into normal mode failed!\n");
173}
174
175/*
176 * initialize SJA1000 chip:
177 *   - reset chip
178 *   - set output mode
179 *   - set baudrate
180 *   - enable interrupts
181 *   - start operating mode
182 */
183static void chipset_init(struct net_device *dev)
184{
185	struct sja1000_priv *priv = netdev_priv(dev);
186
187	/* set clock divider and output control register */
188	priv->write_reg(priv, SJA1000_CDR, priv->cdr | CDR_PELICAN);
189
190	/* set acceptance filter (accept all) */
191	priv->write_reg(priv, SJA1000_ACCC0, 0x00);
192	priv->write_reg(priv, SJA1000_ACCC1, 0x00);
193	priv->write_reg(priv, SJA1000_ACCC2, 0x00);
194	priv->write_reg(priv, SJA1000_ACCC3, 0x00);
195
196	priv->write_reg(priv, SJA1000_ACCM0, 0xFF);
197	priv->write_reg(priv, SJA1000_ACCM1, 0xFF);
198	priv->write_reg(priv, SJA1000_ACCM2, 0xFF);
199	priv->write_reg(priv, SJA1000_ACCM3, 0xFF);
200
201	priv->write_reg(priv, SJA1000_OCR, priv->ocr | OCR_MODE_NORMAL);
202}
203
204static void sja1000_start(struct net_device *dev)
205{
206	struct sja1000_priv *priv = netdev_priv(dev);
207
208	/* leave reset mode */
209	if (priv->can.state != CAN_STATE_STOPPED)
210		set_reset_mode(dev);
211
212	/* Initialize chip if uninitialized at this stage */
213	if (!(priv->read_reg(priv, SJA1000_CDR) & CDR_PELICAN))
214		chipset_init(dev);
215
216	/* Clear error counters and error code capture */
217	priv->write_reg(priv, SJA1000_TXERR, 0x0);
218	priv->write_reg(priv, SJA1000_RXERR, 0x0);
219	priv->read_reg(priv, SJA1000_ECC);
220
221	/* clear interrupt flags */
222	priv->read_reg(priv, SJA1000_IR);
223
224	/* leave reset mode */
225	set_normal_mode(dev);
226}
227
228static int sja1000_set_mode(struct net_device *dev, enum can_mode mode)
229{
230	switch (mode) {
231	case CAN_MODE_START:
232		sja1000_start(dev);
233		if (netif_queue_stopped(dev))
234			netif_wake_queue(dev);
235		break;
236
237	default:
238		return -EOPNOTSUPP;
239	}
240
241	return 0;
242}
243
244static int sja1000_set_bittiming(struct net_device *dev)
245{
246	struct sja1000_priv *priv = netdev_priv(dev);
247	struct can_bittiming *bt = &priv->can.bittiming;
248	u8 btr0, btr1;
249
250	btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
251	btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
252		(((bt->phase_seg2 - 1) & 0x7) << 4);
253	if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
254		btr1 |= 0x80;
255
256	netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
257
258	priv->write_reg(priv, SJA1000_BTR0, btr0);
259	priv->write_reg(priv, SJA1000_BTR1, btr1);
260
261	return 0;
262}
263
264static int sja1000_get_berr_counter(const struct net_device *dev,
265				    struct can_berr_counter *bec)
266{
267	struct sja1000_priv *priv = netdev_priv(dev);
268
269	bec->txerr = priv->read_reg(priv, SJA1000_TXERR);
270	bec->rxerr = priv->read_reg(priv, SJA1000_RXERR);
271
272	return 0;
273}
274
275/*
276 * transmit a CAN message
277 * message layout in the sk_buff should be like this:
278 * xx xx xx xx	 ff	 ll   00 11 22 33 44 55 66 77
279 * [  can-id ] [flags] [len] [can data (up to 8 bytes]
280 */
281static netdev_tx_t sja1000_start_xmit(struct sk_buff *skb,
282					    struct net_device *dev)
283{
284	struct sja1000_priv *priv = netdev_priv(dev);
285	struct can_frame *cf = (struct can_frame *)skb->data;
286	uint8_t fi;
287	uint8_t dlc;
288	canid_t id;
289	uint8_t dreg;
290	u8 cmd_reg_val = 0x00;
291	int i;
292
293	if (can_dropped_invalid_skb(dev, skb))
294		return NETDEV_TX_OK;
295
296	netif_stop_queue(dev);
297
298	fi = dlc = cf->can_dlc;
299	id = cf->can_id;
300
301	if (id & CAN_RTR_FLAG)
302		fi |= SJA1000_FI_RTR;
303
304	if (id & CAN_EFF_FLAG) {
305		fi |= SJA1000_FI_FF;
306		dreg = SJA1000_EFF_BUF;
307		priv->write_reg(priv, SJA1000_FI, fi);
308		priv->write_reg(priv, SJA1000_ID1, (id & 0x1fe00000) >> 21);
309		priv->write_reg(priv, SJA1000_ID2, (id & 0x001fe000) >> 13);
310		priv->write_reg(priv, SJA1000_ID3, (id & 0x00001fe0) >> 5);
311		priv->write_reg(priv, SJA1000_ID4, (id & 0x0000001f) << 3);
312	} else {
313		dreg = SJA1000_SFF_BUF;
314		priv->write_reg(priv, SJA1000_FI, fi);
315		priv->write_reg(priv, SJA1000_ID1, (id & 0x000007f8) >> 3);
316		priv->write_reg(priv, SJA1000_ID2, (id & 0x00000007) << 5);
317	}
318
319	for (i = 0; i < dlc; i++)
320		priv->write_reg(priv, dreg++, cf->data[i]);
321
322	can_put_echo_skb(skb, dev, 0);
323
324	if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
325		cmd_reg_val |= CMD_AT;
326
327	if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
328		cmd_reg_val |= CMD_SRR;
329	else
330		cmd_reg_val |= CMD_TR;
331
332	sja1000_write_cmdreg(priv, cmd_reg_val);
333
334	return NETDEV_TX_OK;
335}
336
337static void sja1000_rx(struct net_device *dev)
338{
339	struct sja1000_priv *priv = netdev_priv(dev);
340	struct net_device_stats *stats = &dev->stats;
341	struct can_frame *cf;
342	struct sk_buff *skb;
343	uint8_t fi;
344	uint8_t dreg;
345	canid_t id;
346	int i;
347
348	/* create zero'ed CAN frame buffer */
349	skb = alloc_can_skb(dev, &cf);
350	if (skb == NULL)
351		return;
352
353	fi = priv->read_reg(priv, SJA1000_FI);
354
355	if (fi & SJA1000_FI_FF) {
356		/* extended frame format (EFF) */
357		dreg = SJA1000_EFF_BUF;
358		id = (priv->read_reg(priv, SJA1000_ID1) << 21)
359		    | (priv->read_reg(priv, SJA1000_ID2) << 13)
360		    | (priv->read_reg(priv, SJA1000_ID3) << 5)
361		    | (priv->read_reg(priv, SJA1000_ID4) >> 3);
362		id |= CAN_EFF_FLAG;
363	} else {
364		/* standard frame format (SFF) */
365		dreg = SJA1000_SFF_BUF;
366		id = (priv->read_reg(priv, SJA1000_ID1) << 3)
367		    | (priv->read_reg(priv, SJA1000_ID2) >> 5);
368	}
369
370	cf->can_dlc = get_can_dlc(fi & 0x0F);
371	if (fi & SJA1000_FI_RTR) {
372		id |= CAN_RTR_FLAG;
373	} else {
374		for (i = 0; i < cf->can_dlc; i++)
375			cf->data[i] = priv->read_reg(priv, dreg++);
376	}
377
378	cf->can_id = id;
379
380	/* release receive buffer */
381	sja1000_write_cmdreg(priv, CMD_RRB);
382
383	netif_rx(skb);
384
385	stats->rx_packets++;
386	stats->rx_bytes += cf->can_dlc;
387
388	can_led_event(dev, CAN_LED_EVENT_RX);
389}
390
391static int sja1000_err(struct net_device *dev, uint8_t isrc, uint8_t status)
392{
393	struct sja1000_priv *priv = netdev_priv(dev);
394	struct net_device_stats *stats = &dev->stats;
395	struct can_frame *cf;
396	struct sk_buff *skb;
397	enum can_state state = priv->can.state;
398	enum can_state rx_state, tx_state;
399	unsigned int rxerr, txerr;
400	uint8_t ecc, alc;
401
402	skb = alloc_can_err_skb(dev, &cf);
403	if (skb == NULL)
404		return -ENOMEM;
405
406	txerr = priv->read_reg(priv, SJA1000_TXERR);
407	rxerr = priv->read_reg(priv, SJA1000_RXERR);
408
409	cf->data[6] = txerr;
410	cf->data[7] = rxerr;
411
412	if (isrc & IRQ_DOI) {
413		/* data overrun interrupt */
414		netdev_dbg(dev, "data overrun interrupt\n");
415		cf->can_id |= CAN_ERR_CRTL;
416		cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
417		stats->rx_over_errors++;
418		stats->rx_errors++;
419		sja1000_write_cmdreg(priv, CMD_CDO);	/* clear bit */
420	}
421
422	if (isrc & IRQ_EI) {
423		/* error warning interrupt */
424		netdev_dbg(dev, "error warning interrupt\n");
425
426		if (status & SR_BS)
427			state = CAN_STATE_BUS_OFF;
428		else if (status & SR_ES)
429			state = CAN_STATE_ERROR_WARNING;
430		else
431			state = CAN_STATE_ERROR_ACTIVE;
432	}
433	if (isrc & IRQ_BEI) {
434		/* bus error interrupt */
435		priv->can.can_stats.bus_error++;
436		stats->rx_errors++;
437
438		ecc = priv->read_reg(priv, SJA1000_ECC);
439
440		cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
441
442		switch (ecc & ECC_MASK) {
443		case ECC_BIT:
444			cf->data[2] |= CAN_ERR_PROT_BIT;
445			break;
446		case ECC_FORM:
447			cf->data[2] |= CAN_ERR_PROT_FORM;
448			break;
449		case ECC_STUFF:
450			cf->data[2] |= CAN_ERR_PROT_STUFF;
451			break;
452		default:
453			cf->data[2] |= CAN_ERR_PROT_UNSPEC;
454			cf->data[3] = ecc & ECC_SEG;
455			break;
456		}
457		/* Error occurred during transmission? */
458		if ((ecc & ECC_DIR) == 0)
459			cf->data[2] |= CAN_ERR_PROT_TX;
460	}
461	if (isrc & IRQ_EPI) {
462		/* error passive interrupt */
463		netdev_dbg(dev, "error passive interrupt\n");
464
465		if (state == CAN_STATE_ERROR_PASSIVE)
466			state = CAN_STATE_ERROR_WARNING;
467		else
468			state = CAN_STATE_ERROR_PASSIVE;
469	}
470	if (isrc & IRQ_ALI) {
471		/* arbitration lost interrupt */
472		netdev_dbg(dev, "arbitration lost interrupt\n");
473		alc = priv->read_reg(priv, SJA1000_ALC);
474		priv->can.can_stats.arbitration_lost++;
475		stats->tx_errors++;
476		cf->can_id |= CAN_ERR_LOSTARB;
477		cf->data[0] = alc & 0x1f;
478	}
479
480	if (state != priv->can.state) {
481		tx_state = txerr >= rxerr ? state : 0;
482		rx_state = txerr <= rxerr ? state : 0;
483
484		can_change_state(dev, cf, tx_state, rx_state);
485
486		if(state == CAN_STATE_BUS_OFF)
487			can_bus_off(dev);
488	}
489
490	netif_rx(skb);
491
492	stats->rx_packets++;
493	stats->rx_bytes += cf->can_dlc;
494
495	return 0;
496}
497
498irqreturn_t sja1000_interrupt(int irq, void *dev_id)
499{
500	struct net_device *dev = (struct net_device *)dev_id;
501	struct sja1000_priv *priv = netdev_priv(dev);
502	struct net_device_stats *stats = &dev->stats;
503	uint8_t isrc, status;
504	int n = 0;
505
506	if (priv->pre_irq)
507		priv->pre_irq(priv);
508
509	/* Shared interrupts and IRQ off? */
510	if (priv->read_reg(priv, SJA1000_IER) == IRQ_OFF)
511		goto out;
512
513	while ((isrc = priv->read_reg(priv, SJA1000_IR)) &&
514	       (n < SJA1000_MAX_IRQ)) {
515
516		status = priv->read_reg(priv, SJA1000_SR);
517		/* check for absent controller due to hw unplug */
518		if (status == 0xFF && sja1000_is_absent(priv))
519			goto out;
520
521		if (isrc & IRQ_WUI)
522			netdev_warn(dev, "wakeup interrupt\n");
523
524		if (isrc & IRQ_TI) {
525			/* transmission buffer released */
526			if (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT &&
527			    !(status & SR_TCS)) {
528				stats->tx_errors++;
529				can_free_echo_skb(dev, 0);
530			} else {
531				/* transmission complete */
532				stats->tx_bytes +=
533					priv->read_reg(priv, SJA1000_FI) & 0xf;
534				stats->tx_packets++;
535				can_get_echo_skb(dev, 0);
536			}
537			netif_wake_queue(dev);
538			can_led_event(dev, CAN_LED_EVENT_TX);
539		}
540		if (isrc & IRQ_RI) {
541			/* receive interrupt */
542			while (status & SR_RBS) {
543				sja1000_rx(dev);
544				status = priv->read_reg(priv, SJA1000_SR);
545				/* check for absent controller */
546				if (status == 0xFF && sja1000_is_absent(priv))
547					goto out;
548			}
549		}
550		if (isrc & (IRQ_DOI | IRQ_EI | IRQ_BEI | IRQ_EPI | IRQ_ALI)) {
551			/* error interrupt */
552			if (sja1000_err(dev, isrc, status))
553				break;
554		}
555		n++;
556	}
557out:
558	if (priv->post_irq)
559		priv->post_irq(priv);
560
561	if (n >= SJA1000_MAX_IRQ)
562		netdev_dbg(dev, "%d messages handled in ISR", n);
563
564	return (n) ? IRQ_HANDLED : IRQ_NONE;
565}
566EXPORT_SYMBOL_GPL(sja1000_interrupt);
567
568static int sja1000_open(struct net_device *dev)
569{
570	struct sja1000_priv *priv = netdev_priv(dev);
571	int err;
572
573	/* set chip into reset mode */
574	set_reset_mode(dev);
575
576	/* common open */
577	err = open_candev(dev);
578	if (err)
579		return err;
580
581	/* register interrupt handler, if not done by the device driver */
582	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER)) {
583		err = request_irq(dev->irq, sja1000_interrupt, priv->irq_flags,
584				  dev->name, (void *)dev);
585		if (err) {
586			close_candev(dev);
587			return -EAGAIN;
588		}
589	}
590
591	/* init and start chi */
592	sja1000_start(dev);
593
594	can_led_event(dev, CAN_LED_EVENT_OPEN);
595
596	netif_start_queue(dev);
597
598	return 0;
599}
600
601static int sja1000_close(struct net_device *dev)
602{
603	struct sja1000_priv *priv = netdev_priv(dev);
604
605	netif_stop_queue(dev);
606	set_reset_mode(dev);
607
608	if (!(priv->flags & SJA1000_CUSTOM_IRQ_HANDLER))
609		free_irq(dev->irq, (void *)dev);
610
611	close_candev(dev);
612
613	can_led_event(dev, CAN_LED_EVENT_STOP);
614
615	return 0;
616}
617
618struct net_device *alloc_sja1000dev(int sizeof_priv)
619{
620	struct net_device *dev;
621	struct sja1000_priv *priv;
622
623	dev = alloc_candev(sizeof(struct sja1000_priv) + sizeof_priv,
624		SJA1000_ECHO_SKB_MAX);
625	if (!dev)
626		return NULL;
627
628	priv = netdev_priv(dev);
629
630	priv->dev = dev;
631	priv->can.bittiming_const = &sja1000_bittiming_const;
632	priv->can.do_set_bittiming = sja1000_set_bittiming;
633	priv->can.do_set_mode = sja1000_set_mode;
634	priv->can.do_get_berr_counter = sja1000_get_berr_counter;
635	priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
636				       CAN_CTRLMODE_LISTENONLY |
637				       CAN_CTRLMODE_3_SAMPLES |
638				       CAN_CTRLMODE_ONE_SHOT |
639				       CAN_CTRLMODE_BERR_REPORTING |
640				       CAN_CTRLMODE_PRESUME_ACK;
641
642	spin_lock_init(&priv->cmdreg_lock);
643
644	if (sizeof_priv)
645		priv->priv = (void *)priv + sizeof(struct sja1000_priv);
646
647	return dev;
648}
649EXPORT_SYMBOL_GPL(alloc_sja1000dev);
650
651void free_sja1000dev(struct net_device *dev)
652{
653	free_candev(dev);
654}
655EXPORT_SYMBOL_GPL(free_sja1000dev);
656
657static const struct net_device_ops sja1000_netdev_ops = {
658	.ndo_open	= sja1000_open,
659	.ndo_stop	= sja1000_close,
660	.ndo_start_xmit	= sja1000_start_xmit,
661	.ndo_change_mtu	= can_change_mtu,
662};
663
664int register_sja1000dev(struct net_device *dev)
665{
666	int ret;
667
668	if (!sja1000_probe_chip(dev))
669		return -ENODEV;
670
671	dev->flags |= IFF_ECHO;	/* we support local echo */
672	dev->netdev_ops = &sja1000_netdev_ops;
673
674	set_reset_mode(dev);
675	chipset_init(dev);
676
677	ret =  register_candev(dev);
678
679	if (!ret)
680		devm_can_led_init(dev);
681
682	return ret;
683}
684EXPORT_SYMBOL_GPL(register_sja1000dev);
685
686void unregister_sja1000dev(struct net_device *dev)
687{
688	set_reset_mode(dev);
689	unregister_candev(dev);
690}
691EXPORT_SYMBOL_GPL(unregister_sja1000dev);
692
693static __init int sja1000_init(void)
694{
695	printk(KERN_INFO "%s CAN netdevice driver\n", DRV_NAME);
696
697	return 0;
698}
699
700module_init(sja1000_init);
701
702static __exit void sja1000_exit(void)
703{
704	printk(KERN_INFO "%s: driver removed\n", DRV_NAME);
705}
706
707module_exit(sja1000_exit);
708