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19#include <linux/netdevice.h>
20#include <linux/usb.h>
21#include <linux/module.h>
22
23#include <linux/can.h>
24#include <linux/can/dev.h>
25#include <linux/can/error.h>
26
27#include "pcan_usb_core.h"
28
29MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB adapter");
30
31
32#define PCAN_USB_EP_CMDOUT 1
33#define PCAN_USB_EP_CMDIN (PCAN_USB_EP_CMDOUT | USB_DIR_IN)
34#define PCAN_USB_EP_MSGOUT 2
35#define PCAN_USB_EP_MSGIN (PCAN_USB_EP_MSGOUT | USB_DIR_IN)
36
37
38#define PCAN_USB_CMD_FUNC 0
39#define PCAN_USB_CMD_NUM 1
40#define PCAN_USB_CMD_ARGS 2
41#define PCAN_USB_CMD_ARGS_LEN 14
42#define PCAN_USB_CMD_LEN (PCAN_USB_CMD_ARGS + \
43 PCAN_USB_CMD_ARGS_LEN)
44
45
46#define PCAN_USB_COMMAND_TIMEOUT 1000
47
48
49#define PCAN_USB_STARTUP_TIMEOUT 10
50
51
52#define PCAN_USB_RX_BUFFER_SIZE 64
53#define PCAN_USB_TX_BUFFER_SIZE 64
54
55#define PCAN_USB_MSG_HEADER_LEN 2
56
57
58#define PCAN_USB_CRYSTAL_HZ 16000000
59
60
61#define PCAN_USB_STATUSLEN_TIMESTAMP (1 << 7)
62#define PCAN_USB_STATUSLEN_INTERNAL (1 << 6)
63#define PCAN_USB_STATUSLEN_EXT_ID (1 << 5)
64#define PCAN_USB_STATUSLEN_RTR (1 << 4)
65#define PCAN_USB_STATUSLEN_DLC (0xf)
66
67
68#define PCAN_USB_ERROR_TXFULL 0x01
69#define PCAN_USB_ERROR_RXQOVR 0x02
70#define PCAN_USB_ERROR_BUS_LIGHT 0x04
71#define PCAN_USB_ERROR_BUS_HEAVY 0x08
72#define PCAN_USB_ERROR_BUS_OFF 0x10
73#define PCAN_USB_ERROR_RXQEMPTY 0x20
74#define PCAN_USB_ERROR_QOVR 0x40
75#define PCAN_USB_ERROR_TXQFULL 0x80
76
77
78#define SJA1000_MODE_NORMAL 0x00
79#define SJA1000_MODE_INIT 0x01
80
81
82
83
84
85
86#define PCAN_USB_TS_DIV_SHIFTER 20
87#define PCAN_USB_TS_US_PER_TICK 44739243
88
89
90#define PCAN_USB_REC_ERROR 1
91#define PCAN_USB_REC_ANALOG 2
92#define PCAN_USB_REC_BUSLOAD 3
93#define PCAN_USB_REC_TS 4
94#define PCAN_USB_REC_BUSEVT 5
95
96
97struct pcan_usb {
98 struct peak_usb_device dev;
99 struct peak_time_ref time_ref;
100 struct timer_list restart_timer;
101};
102
103
104struct pcan_usb_msg_context {
105 u16 ts16;
106 u8 prev_ts8;
107 u8 *ptr;
108 u8 *end;
109 u8 rec_cnt;
110 u8 rec_idx;
111 u8 rec_data_idx;
112 struct net_device *netdev;
113 struct pcan_usb *pdev;
114};
115
116
117
118
119static int pcan_usb_send_cmd(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
120{
121 int err;
122 int actual_length;
123
124
125 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
126 return 0;
127
128 dev->cmd_buf[PCAN_USB_CMD_FUNC] = f;
129 dev->cmd_buf[PCAN_USB_CMD_NUM] = n;
130
131 if (p)
132 memcpy(dev->cmd_buf + PCAN_USB_CMD_ARGS,
133 p, PCAN_USB_CMD_ARGS_LEN);
134
135 err = usb_bulk_msg(dev->udev,
136 usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
137 dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
138 PCAN_USB_COMMAND_TIMEOUT);
139 if (err)
140 netdev_err(dev->netdev,
141 "sending cmd f=0x%x n=0x%x failure: %d\n",
142 f, n, err);
143 return err;
144}
145
146
147
148
149static int pcan_usb_wait_rsp(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
150{
151 int err;
152 int actual_length;
153
154
155 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
156 return 0;
157
158
159 err = pcan_usb_send_cmd(dev, f, n, NULL);
160 if (err)
161 return err;
162
163 err = usb_bulk_msg(dev->udev,
164 usb_rcvbulkpipe(dev->udev, PCAN_USB_EP_CMDIN),
165 dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
166 PCAN_USB_COMMAND_TIMEOUT);
167 if (err)
168 netdev_err(dev->netdev,
169 "waiting rsp f=0x%x n=0x%x failure: %d\n", f, n, err);
170 else if (p)
171 memcpy(p, dev->cmd_buf + PCAN_USB_CMD_ARGS,
172 PCAN_USB_CMD_ARGS_LEN);
173
174 return err;
175}
176
177static int pcan_usb_set_sja1000(struct peak_usb_device *dev, u8 mode)
178{
179 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
180 [1] = mode,
181 };
182
183 return pcan_usb_send_cmd(dev, 9, 2, args);
184}
185
186static int pcan_usb_set_bus(struct peak_usb_device *dev, u8 onoff)
187{
188 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
189 [0] = !!onoff,
190 };
191
192 return pcan_usb_send_cmd(dev, 3, 2, args);
193}
194
195static int pcan_usb_set_silent(struct peak_usb_device *dev, u8 onoff)
196{
197 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
198 [0] = !!onoff,
199 };
200
201 return pcan_usb_send_cmd(dev, 3, 3, args);
202}
203
204static int pcan_usb_set_ext_vcc(struct peak_usb_device *dev, u8 onoff)
205{
206 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
207 [0] = !!onoff,
208 };
209
210 return pcan_usb_send_cmd(dev, 10, 2, args);
211}
212
213
214
215
216static int pcan_usb_set_bittiming(struct peak_usb_device *dev,
217 struct can_bittiming *bt)
218{
219 u8 args[PCAN_USB_CMD_ARGS_LEN];
220 u8 btr0, btr1;
221
222 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
223 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
224 (((bt->phase_seg2 - 1) & 0x7) << 4);
225 if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
226 btr1 |= 0x80;
227
228 netdev_info(dev->netdev, "setting BTR0=0x%02x BTR1=0x%02x\n",
229 btr0, btr1);
230
231 args[0] = btr1;
232 args[1] = btr0;
233
234 return pcan_usb_send_cmd(dev, 1, 2, args);
235}
236
237
238
239
240static int pcan_usb_write_mode(struct peak_usb_device *dev, u8 onoff)
241{
242 int err;
243
244 err = pcan_usb_set_bus(dev, onoff);
245 if (err)
246 return err;
247
248 if (!onoff) {
249 err = pcan_usb_set_sja1000(dev, SJA1000_MODE_INIT);
250 } else {
251
252 set_current_state(TASK_INTERRUPTIBLE);
253 schedule_timeout(msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
254 }
255
256 return err;
257}
258
259
260
261
262static void pcan_usb_restart(unsigned long arg)
263{
264
265 peak_usb_restart_complete((struct peak_usb_device *)arg);
266}
267
268
269
270
271static void pcan_usb_restart_pending(struct urb *urb)
272{
273 struct pcan_usb *pdev = urb->context;
274
275
276 mod_timer(&pdev->restart_timer,
277 jiffies + msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
278
279
280 peak_usb_async_complete(urb);
281}
282
283
284
285
286static int pcan_usb_restart_async(struct peak_usb_device *dev, struct urb *urb,
287 u8 *buf)
288{
289 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
290
291 if (timer_pending(&pdev->restart_timer))
292 return -EBUSY;
293
294
295 buf[PCAN_USB_CMD_FUNC] = 3;
296 buf[PCAN_USB_CMD_NUM] = 2;
297 buf[PCAN_USB_CMD_ARGS] = 1;
298
299 usb_fill_bulk_urb(urb, dev->udev,
300 usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
301 buf, PCAN_USB_CMD_LEN,
302 pcan_usb_restart_pending, pdev);
303
304 return usb_submit_urb(urb, GFP_ATOMIC);
305}
306
307
308
309
310static int pcan_usb_get_serial(struct peak_usb_device *dev, u32 *serial_number)
311{
312 u8 args[PCAN_USB_CMD_ARGS_LEN];
313 int err;
314
315 err = pcan_usb_wait_rsp(dev, 6, 1, args);
316 if (err) {
317 netdev_err(dev->netdev, "getting serial failure: %d\n", err);
318 } else if (serial_number) {
319 __le32 tmp32;
320
321 memcpy(&tmp32, args, 4);
322 *serial_number = le32_to_cpu(tmp32);
323 }
324
325 return err;
326}
327
328
329
330
331static int pcan_usb_get_device_id(struct peak_usb_device *dev, u32 *device_id)
332{
333 u8 args[PCAN_USB_CMD_ARGS_LEN];
334 int err;
335
336 err = pcan_usb_wait_rsp(dev, 4, 1, args);
337 if (err)
338 netdev_err(dev->netdev, "getting device id failure: %d\n", err);
339 else if (device_id)
340 *device_id = args[0];
341
342 return err;
343}
344
345
346
347
348static int pcan_usb_update_ts(struct pcan_usb_msg_context *mc)
349{
350 __le16 tmp16;
351
352 if ((mc->ptr+2) > mc->end)
353 return -EINVAL;
354
355 memcpy(&tmp16, mc->ptr, 2);
356
357 mc->ts16 = le16_to_cpu(tmp16);
358
359 if (mc->rec_idx > 0)
360 peak_usb_update_ts_now(&mc->pdev->time_ref, mc->ts16);
361 else
362 peak_usb_set_ts_now(&mc->pdev->time_ref, mc->ts16);
363
364 return 0;
365}
366
367
368
369
370static int pcan_usb_decode_ts(struct pcan_usb_msg_context *mc, u8 first_packet)
371{
372
373 if (first_packet) {
374 __le16 tmp16;
375
376 if ((mc->ptr + 2) > mc->end)
377 return -EINVAL;
378
379 memcpy(&tmp16, mc->ptr, 2);
380 mc->ptr += 2;
381
382 mc->ts16 = le16_to_cpu(tmp16);
383 mc->prev_ts8 = mc->ts16 & 0x00ff;
384 } else {
385 u8 ts8;
386
387 if ((mc->ptr + 1) > mc->end)
388 return -EINVAL;
389
390 ts8 = *mc->ptr++;
391
392 if (ts8 < mc->prev_ts8)
393 mc->ts16 += 0x100;
394
395 mc->ts16 &= 0xff00;
396 mc->ts16 |= ts8;
397 mc->prev_ts8 = ts8;
398 }
399
400 return 0;
401}
402
403static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
404 u8 status_len)
405{
406 struct sk_buff *skb;
407 struct can_frame *cf;
408 struct timeval tv;
409 enum can_state new_state;
410
411
412 if (n == PCAN_USB_ERROR_QOVR)
413 if (!mc->pdev->time_ref.tick_count)
414 return 0;
415
416 new_state = mc->pdev->dev.can.state;
417
418 switch (mc->pdev->dev.can.state) {
419 case CAN_STATE_ERROR_ACTIVE:
420 if (n & PCAN_USB_ERROR_BUS_LIGHT) {
421 new_state = CAN_STATE_ERROR_WARNING;
422 break;
423 }
424
425 case CAN_STATE_ERROR_WARNING:
426 if (n & PCAN_USB_ERROR_BUS_HEAVY) {
427 new_state = CAN_STATE_ERROR_PASSIVE;
428 break;
429 }
430 if (n & PCAN_USB_ERROR_BUS_OFF) {
431 new_state = CAN_STATE_BUS_OFF;
432 break;
433 }
434 if (n & (PCAN_USB_ERROR_RXQOVR | PCAN_USB_ERROR_QOVR)) {
435
436
437
438
439 new_state = CAN_STATE_MAX;
440 break;
441 }
442 if ((n & PCAN_USB_ERROR_BUS_LIGHT) == 0) {
443
444 mc->pdev->dev.can.state = CAN_STATE_ERROR_ACTIVE;
445 return 0;
446 }
447 break;
448
449 case CAN_STATE_ERROR_PASSIVE:
450 if (n & PCAN_USB_ERROR_BUS_OFF) {
451 new_state = CAN_STATE_BUS_OFF;
452 break;
453 }
454 if (n & PCAN_USB_ERROR_BUS_LIGHT) {
455 new_state = CAN_STATE_ERROR_WARNING;
456 break;
457 }
458 if (n & (PCAN_USB_ERROR_RXQOVR | PCAN_USB_ERROR_QOVR)) {
459
460
461
462
463 new_state = CAN_STATE_MAX;
464 break;
465 }
466
467 if ((n & PCAN_USB_ERROR_BUS_HEAVY) == 0) {
468
469 mc->pdev->dev.can.state = CAN_STATE_ERROR_ACTIVE;
470 return 0;
471 }
472 break;
473
474 default:
475
476 return 0;
477 }
478
479
480 if (mc->pdev->dev.can.state == new_state)
481 return 0;
482
483
484 skb = alloc_can_err_skb(mc->netdev, &cf);
485 if (!skb)
486 return -ENOMEM;
487
488 switch (new_state) {
489 case CAN_STATE_BUS_OFF:
490 cf->can_id |= CAN_ERR_BUSOFF;
491 mc->pdev->dev.can.can_stats.bus_off++;
492 can_bus_off(mc->netdev);
493 break;
494
495 case CAN_STATE_ERROR_PASSIVE:
496 cf->can_id |= CAN_ERR_CRTL;
497 cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE |
498 CAN_ERR_CRTL_RX_PASSIVE;
499 mc->pdev->dev.can.can_stats.error_passive++;
500 break;
501
502 case CAN_STATE_ERROR_WARNING:
503 cf->can_id |= CAN_ERR_CRTL;
504 cf->data[1] |= CAN_ERR_CRTL_TX_WARNING |
505 CAN_ERR_CRTL_RX_WARNING;
506 mc->pdev->dev.can.can_stats.error_warning++;
507 break;
508
509 default:
510
511 cf->can_id |= CAN_ERR_CRTL;
512 cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
513 mc->netdev->stats.rx_over_errors++;
514 mc->netdev->stats.rx_errors++;
515
516 new_state = mc->pdev->dev.can.state;
517 break;
518 }
519
520 mc->pdev->dev.can.state = new_state;
521
522 if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
523 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
524
525 peak_usb_get_ts_tv(&mc->pdev->time_ref, mc->ts16, &tv);
526 hwts->hwtstamp = timeval_to_ktime(tv);
527 }
528
529 mc->netdev->stats.rx_packets++;
530 mc->netdev->stats.rx_bytes += cf->can_dlc;
531 netif_rx(skb);
532
533 return 0;
534}
535
536
537
538
539static int pcan_usb_decode_status(struct pcan_usb_msg_context *mc,
540 u8 status_len)
541{
542 u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
543 u8 f, n;
544 int err;
545
546
547 if ((mc->ptr + 2) > mc->end)
548 return -EINVAL;
549
550 f = mc->ptr[PCAN_USB_CMD_FUNC];
551 n = mc->ptr[PCAN_USB_CMD_NUM];
552 mc->ptr += PCAN_USB_CMD_ARGS;
553
554 if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
555 int err = pcan_usb_decode_ts(mc, !mc->rec_idx);
556
557 if (err)
558 return err;
559 }
560
561 switch (f) {
562 case PCAN_USB_REC_ERROR:
563 err = pcan_usb_decode_error(mc, n, status_len);
564 if (err)
565 return err;
566 break;
567
568 case PCAN_USB_REC_ANALOG:
569
570 rec_len = 2;
571 break;
572
573 case PCAN_USB_REC_BUSLOAD:
574
575 rec_len = 1;
576 break;
577
578 case PCAN_USB_REC_TS:
579
580 if (pcan_usb_update_ts(mc))
581 return -EINVAL;
582 break;
583
584 case PCAN_USB_REC_BUSEVT:
585
586 if (n & PCAN_USB_ERROR_TXQFULL)
587 netdev_dbg(mc->netdev, "device Tx queue full)\n");
588 break;
589 default:
590 netdev_err(mc->netdev, "unexpected function %u\n", f);
591 break;
592 }
593
594 if ((mc->ptr + rec_len) > mc->end)
595 return -EINVAL;
596
597 mc->ptr += rec_len;
598
599 return 0;
600}
601
602
603
604
605static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
606{
607 u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
608 struct sk_buff *skb;
609 struct can_frame *cf;
610 struct timeval tv;
611 struct skb_shared_hwtstamps *hwts;
612
613 skb = alloc_can_skb(mc->netdev, &cf);
614 if (!skb)
615 return -ENOMEM;
616
617 if (status_len & PCAN_USB_STATUSLEN_EXT_ID) {
618 __le32 tmp32;
619
620 if ((mc->ptr + 4) > mc->end)
621 goto decode_failed;
622
623 memcpy(&tmp32, mc->ptr, 4);
624 mc->ptr += 4;
625
626 cf->can_id = (le32_to_cpu(tmp32) >> 3) | CAN_EFF_FLAG;
627 } else {
628 __le16 tmp16;
629
630 if ((mc->ptr + 2) > mc->end)
631 goto decode_failed;
632
633 memcpy(&tmp16, mc->ptr, 2);
634 mc->ptr += 2;
635
636 cf->can_id = le16_to_cpu(tmp16) >> 5;
637 }
638
639 cf->can_dlc = get_can_dlc(rec_len);
640
641
642 if (pcan_usb_decode_ts(mc, !mc->rec_data_idx))
643 goto decode_failed;
644
645
646 memset(cf->data, 0x0, sizeof(cf->data));
647 if (status_len & PCAN_USB_STATUSLEN_RTR) {
648 cf->can_id |= CAN_RTR_FLAG;
649 } else {
650 if ((mc->ptr + rec_len) > mc->end)
651 goto decode_failed;
652
653 memcpy(cf->data, mc->ptr, cf->can_dlc);
654 mc->ptr += rec_len;
655 }
656
657
658 peak_usb_get_ts_tv(&mc->pdev->time_ref, mc->ts16, &tv);
659 hwts = skb_hwtstamps(skb);
660 hwts->hwtstamp = timeval_to_ktime(tv);
661
662
663 mc->netdev->stats.rx_packets++;
664 mc->netdev->stats.rx_bytes += cf->can_dlc;
665
666 netif_rx(skb);
667
668 return 0;
669
670decode_failed:
671 dev_kfree_skb(skb);
672 return -EINVAL;
673}
674
675
676
677
678static int pcan_usb_decode_msg(struct peak_usb_device *dev, u8 *ibuf, u32 lbuf)
679{
680 struct pcan_usb_msg_context mc = {
681 .rec_cnt = ibuf[1],
682 .ptr = ibuf + PCAN_USB_MSG_HEADER_LEN,
683 .end = ibuf + lbuf,
684 .netdev = dev->netdev,
685 .pdev = container_of(dev, struct pcan_usb, dev),
686 };
687 int err;
688
689 for (err = 0; mc.rec_idx < mc.rec_cnt && !err; mc.rec_idx++) {
690 u8 sl = *mc.ptr++;
691
692
693 if (sl & PCAN_USB_STATUSLEN_INTERNAL) {
694 err = pcan_usb_decode_status(&mc, sl);
695
696 } else {
697 err = pcan_usb_decode_data(&mc, sl);
698 mc.rec_data_idx++;
699 }
700 }
701
702 return err;
703}
704
705
706
707
708static int pcan_usb_decode_buf(struct peak_usb_device *dev, struct urb *urb)
709{
710 int err = 0;
711
712 if (urb->actual_length > PCAN_USB_MSG_HEADER_LEN) {
713 err = pcan_usb_decode_msg(dev, urb->transfer_buffer,
714 urb->actual_length);
715
716 } else if (urb->actual_length > 0) {
717 netdev_err(dev->netdev, "usb message length error (%u)\n",
718 urb->actual_length);
719 err = -EINVAL;
720 }
721
722 return err;
723}
724
725
726
727
728static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb,
729 u8 *obuf, size_t *size)
730{
731 struct net_device *netdev = dev->netdev;
732 struct net_device_stats *stats = &netdev->stats;
733 struct can_frame *cf = (struct can_frame *)skb->data;
734 u8 *pc;
735
736 obuf[0] = 2;
737 obuf[1] = 1;
738
739 pc = obuf + PCAN_USB_MSG_HEADER_LEN;
740
741
742 *pc = cf->can_dlc;
743 if (cf->can_id & CAN_RTR_FLAG)
744 *pc |= PCAN_USB_STATUSLEN_RTR;
745
746
747 if (cf->can_id & CAN_EFF_FLAG) {
748 __le32 tmp32 = cpu_to_le32((cf->can_id & CAN_ERR_MASK) << 3);
749
750 *pc |= PCAN_USB_STATUSLEN_EXT_ID;
751 memcpy(++pc, &tmp32, 4);
752 pc += 4;
753 } else {
754 __le16 tmp16 = cpu_to_le16((cf->can_id & CAN_ERR_MASK) << 5);
755
756 memcpy(++pc, &tmp16, 2);
757 pc += 2;
758 }
759
760
761 if (!(cf->can_id & CAN_RTR_FLAG)) {
762 memcpy(pc, cf->data, cf->can_dlc);
763 pc += cf->can_dlc;
764 }
765
766 obuf[(*size)-1] = (u8)(stats->tx_packets & 0xff);
767
768 return 0;
769}
770
771
772
773
774static int pcan_usb_start(struct peak_usb_device *dev)
775{
776 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
777
778
779 peak_usb_init_time_ref(&pdev->time_ref, &pcan_usb);
780
781
782 if (dev->device_rev > 3) {
783 int err;
784
785 err = pcan_usb_set_silent(dev,
786 dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
787 if (err)
788 return err;
789 }
790
791 return pcan_usb_set_ext_vcc(dev, 0);
792}
793
794static int pcan_usb_init(struct peak_usb_device *dev)
795{
796 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
797 u32 serial_number;
798 int err;
799
800
801 init_timer(&pdev->restart_timer);
802 pdev->restart_timer.function = pcan_usb_restart;
803 pdev->restart_timer.data = (unsigned long)dev;
804
805
806
807
808
809
810 err = pcan_usb_get_serial(dev, &serial_number);
811 if (err) {
812 dev_err(dev->netdev->dev.parent,
813 "unable to read %s serial number (err %d)\n",
814 pcan_usb.name, err);
815 return err;
816 }
817
818 dev_info(dev->netdev->dev.parent,
819 "PEAK-System %s adapter hwrev %u serial %08X (%u channel)\n",
820 pcan_usb.name, dev->device_rev, serial_number,
821 pcan_usb.ctrl_count);
822
823 return 0;
824}
825
826
827
828
829static int pcan_usb_probe(struct usb_interface *intf)
830{
831 struct usb_host_interface *if_desc;
832 int i;
833
834 if_desc = intf->altsetting;
835
836
837 for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
838 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
839
840 switch (ep->bEndpointAddress) {
841 case PCAN_USB_EP_CMDOUT:
842 case PCAN_USB_EP_CMDIN:
843 case PCAN_USB_EP_MSGOUT:
844 case PCAN_USB_EP_MSGIN:
845 break;
846 default:
847 return -ENODEV;
848 }
849 }
850
851 return 0;
852}
853
854
855
856
857static const struct can_bittiming_const pcan_usb_const = {
858 .name = "pcan_usb",
859 .tseg1_min = 1,
860 .tseg1_max = 16,
861 .tseg2_min = 1,
862 .tseg2_max = 8,
863 .sjw_max = 4,
864 .brp_min = 1,
865 .brp_max = 64,
866 .brp_inc = 1,
867};
868
869const struct peak_usb_adapter pcan_usb = {
870 .name = "PCAN-USB",
871 .device_id = PCAN_USB_PRODUCT_ID,
872 .ctrl_count = 1,
873 .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
874 .clock = {
875 .freq = PCAN_USB_CRYSTAL_HZ / 2 ,
876 },
877 .bittiming_const = &pcan_usb_const,
878
879
880 .sizeof_dev_private = sizeof(struct pcan_usb),
881
882
883 .ts_used_bits = 16,
884 .ts_period = 24575,
885 .us_per_ts_scale = PCAN_USB_TS_US_PER_TICK,
886 .us_per_ts_shift = PCAN_USB_TS_DIV_SHIFTER,
887
888
889 .ep_msg_in = PCAN_USB_EP_MSGIN,
890 .ep_msg_out = {PCAN_USB_EP_MSGOUT},
891
892
893 .rx_buffer_size = PCAN_USB_RX_BUFFER_SIZE,
894 .tx_buffer_size = PCAN_USB_TX_BUFFER_SIZE,
895
896
897 .intf_probe = pcan_usb_probe,
898 .dev_init = pcan_usb_init,
899 .dev_set_bus = pcan_usb_write_mode,
900 .dev_set_bittiming = pcan_usb_set_bittiming,
901 .dev_get_device_id = pcan_usb_get_device_id,
902 .dev_decode_buf = pcan_usb_decode_buf,
903 .dev_encode_msg = pcan_usb_encode_msg,
904 .dev_start = pcan_usb_start,
905 .dev_restart_async = pcan_usb_restart_async,
906};
907