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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * CAN driver for PEAK System PCAN-USB adapter
4 * Derived from the PCAN project file driver/src/pcan_usb.c
5 *
6 * Copyright (C) 2003-2010 PEAK System-Technik GmbH
7 * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com>
8 *
9 * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de>
10 */
11#include <asm/unaligned.h>
12
13#include <linux/ethtool.h>
14#include <linux/module.h>
15#include <linux/netdevice.h>
16#include <linux/usb.h>
17
18#include <linux/can.h>
19#include <linux/can/dev.h>
20#include <linux/can/error.h>
21
22#include "pcan_usb_core.h"
23
24/* PCAN-USB Endpoints */
25#define PCAN_USB_EP_CMDOUT 1
26#define PCAN_USB_EP_CMDIN (PCAN_USB_EP_CMDOUT | USB_DIR_IN)
27#define PCAN_USB_EP_MSGOUT 2
28#define PCAN_USB_EP_MSGIN (PCAN_USB_EP_MSGOUT | USB_DIR_IN)
29
30/* PCAN-USB command struct */
31#define PCAN_USB_CMD_FUNC 0
32#define PCAN_USB_CMD_NUM 1
33#define PCAN_USB_CMD_ARGS 2
34#define PCAN_USB_CMD_ARGS_LEN 14
35#define PCAN_USB_CMD_LEN (PCAN_USB_CMD_ARGS + \
36 PCAN_USB_CMD_ARGS_LEN)
37
38/* PCAN-USB commands */
39#define PCAN_USB_CMD_BITRATE 1
40#define PCAN_USB_CMD_SET_BUS 3
41#define PCAN_USB_CMD_DEVID 4
42#define PCAN_USB_CMD_SN 6
43#define PCAN_USB_CMD_REGISTER 9
44#define PCAN_USB_CMD_EXT_VCC 10
45#define PCAN_USB_CMD_ERR_FR 11
46#define PCAN_USB_CMD_LED 12
47
48/* PCAN_USB_CMD_SET_BUS number arg */
49#define PCAN_USB_BUS_XCVER 2
50#define PCAN_USB_BUS_SILENT_MODE 3
51
52/* PCAN_USB_CMD_xxx functions */
53#define PCAN_USB_GET 1
54#define PCAN_USB_SET 2
55
56/* PCAN-USB command timeout (ms.) */
57#define PCAN_USB_COMMAND_TIMEOUT 1000
58
59/* PCAN-USB startup timeout (ms.) */
60#define PCAN_USB_STARTUP_TIMEOUT 10
61
62/* PCAN-USB rx/tx buffers size */
63#define PCAN_USB_RX_BUFFER_SIZE 64
64#define PCAN_USB_TX_BUFFER_SIZE 64
65
66#define PCAN_USB_MSG_HEADER_LEN 2
67
68#define PCAN_USB_MSG_TX_CAN 2 /* Tx msg is a CAN frame */
69
70/* PCAN-USB adapter internal clock (MHz) */
71#define PCAN_USB_CRYSTAL_HZ 16000000
72
73/* PCAN-USB USB message record status/len field */
74#define PCAN_USB_STATUSLEN_TIMESTAMP (1 << 7)
75#define PCAN_USB_STATUSLEN_INTERNAL (1 << 6)
76#define PCAN_USB_STATUSLEN_EXT_ID (1 << 5)
77#define PCAN_USB_STATUSLEN_RTR (1 << 4)
78#define PCAN_USB_STATUSLEN_DLC (0xf)
79
80/* PCAN-USB 4.1 CAN Id tx extended flags */
81#define PCAN_USB_TX_SRR 0x01 /* SJA1000 SRR command */
82#define PCAN_USB_TX_AT 0x02 /* SJA1000 AT command */
83
84/* PCAN-USB error flags */
85#define PCAN_USB_ERROR_TXFULL 0x01
86#define PCAN_USB_ERROR_RXQOVR 0x02
87#define PCAN_USB_ERROR_BUS_LIGHT 0x04
88#define PCAN_USB_ERROR_BUS_HEAVY 0x08
89#define PCAN_USB_ERROR_BUS_OFF 0x10
90#define PCAN_USB_ERROR_RXQEMPTY 0x20
91#define PCAN_USB_ERROR_QOVR 0x40
92#define PCAN_USB_ERROR_TXQFULL 0x80
93
94#define PCAN_USB_ERROR_BUS (PCAN_USB_ERROR_BUS_LIGHT | \
95 PCAN_USB_ERROR_BUS_HEAVY | \
96 PCAN_USB_ERROR_BUS_OFF)
97
98/* SJA1000 modes */
99#define SJA1000_MODE_NORMAL 0x00
100#define SJA1000_MODE_INIT 0x01
101
102/*
103 * tick duration = 42.666 us =>
104 * (tick_number * 44739243) >> 20 ~ (tick_number * 42666) / 1000
105 * accuracy = 10^-7
106 */
107#define PCAN_USB_TS_DIV_SHIFTER 20
108#define PCAN_USB_TS_US_PER_TICK 44739243
109
110/* PCAN-USB messages record types */
111#define PCAN_USB_REC_ERROR 1
112#define PCAN_USB_REC_ANALOG 2
113#define PCAN_USB_REC_BUSLOAD 3
114#define PCAN_USB_REC_TS 4
115#define PCAN_USB_REC_BUSEVT 5
116
117/* CAN bus events notifications selection mask */
118#define PCAN_USB_ERR_RXERR 0x02 /* ask for rxerr counter */
119#define PCAN_USB_ERR_TXERR 0x04 /* ask for txerr counter */
120
121/* This mask generates an usb packet each time the state of the bus changes.
122 * In other words, its interest is to know which side among rx and tx is
123 * responsible of the change of the bus state.
124 */
125#define PCAN_USB_BERR_MASK (PCAN_USB_ERR_RXERR | PCAN_USB_ERR_TXERR)
126
127/* identify bus event packets with rx/tx error counters */
128#define PCAN_USB_ERR_CNT_DEC 0x00 /* counters are decreasing */
129#define PCAN_USB_ERR_CNT_INC 0x80 /* counters are increasing */
130
131/* private to PCAN-USB adapter */
132struct pcan_usb {
133 struct peak_usb_device dev;
134 struct peak_time_ref time_ref;
135 struct timer_list restart_timer;
136 struct can_berr_counter bec;
137};
138
139/* incoming message context for decoding */
140struct pcan_usb_msg_context {
141 u16 ts16;
142 u8 prev_ts8;
143 u8 *ptr;
144 u8 *end;
145 u8 rec_cnt;
146 u8 rec_idx;
147 u8 rec_ts_idx;
148 struct net_device *netdev;
149 struct pcan_usb *pdev;
150};
151
152/*
153 * send a command
154 */
155static int pcan_usb_send_cmd(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
156{
157 int err;
158 int actual_length;
159
160 /* usb device unregistered? */
161 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
162 return 0;
163
164 dev->cmd_buf[PCAN_USB_CMD_FUNC] = f;
165 dev->cmd_buf[PCAN_USB_CMD_NUM] = n;
166
167 if (p)
168 memcpy(dev->cmd_buf + PCAN_USB_CMD_ARGS,
169 p, PCAN_USB_CMD_ARGS_LEN);
170
171 err = usb_bulk_msg(dev->udev,
172 usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
173 dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
174 PCAN_USB_COMMAND_TIMEOUT);
175 if (err)
176 netdev_err(dev->netdev,
177 "sending cmd f=0x%x n=0x%x failure: %d\n",
178 f, n, err);
179 return err;
180}
181
182/*
183 * send a command then wait for its response
184 */
185static int pcan_usb_wait_rsp(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
186{
187 int err;
188 int actual_length;
189
190 /* usb device unregistered? */
191 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
192 return 0;
193
194 /* first, send command */
195 err = pcan_usb_send_cmd(dev, f, n, NULL);
196 if (err)
197 return err;
198
199 err = usb_bulk_msg(dev->udev,
200 usb_rcvbulkpipe(dev->udev, PCAN_USB_EP_CMDIN),
201 dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
202 PCAN_USB_COMMAND_TIMEOUT);
203 if (err)
204 netdev_err(dev->netdev,
205 "waiting rsp f=0x%x n=0x%x failure: %d\n", f, n, err);
206 else if (p)
207 memcpy(p, dev->cmd_buf + PCAN_USB_CMD_ARGS,
208 PCAN_USB_CMD_ARGS_LEN);
209
210 return err;
211}
212
213static int pcan_usb_set_sja1000(struct peak_usb_device *dev, u8 mode)
214{
215 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
216 [1] = mode,
217 };
218
219 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_REGISTER, PCAN_USB_SET,
220 args);
221}
222
223static int pcan_usb_set_bus(struct peak_usb_device *dev, u8 onoff)
224{
225 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
226 [0] = !!onoff,
227 };
228
229 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_SET_BUS, PCAN_USB_BUS_XCVER,
230 args);
231}
232
233static int pcan_usb_set_silent(struct peak_usb_device *dev, u8 onoff)
234{
235 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
236 [0] = !!onoff,
237 };
238
239 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_SET_BUS,
240 PCAN_USB_BUS_SILENT_MODE, args);
241}
242
243/* send the cmd to be notified from bus errors */
244static int pcan_usb_set_err_frame(struct peak_usb_device *dev, u8 err_mask)
245{
246 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
247 [0] = err_mask,
248 };
249
250 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_ERR_FR, PCAN_USB_SET, args);
251}
252
253static int pcan_usb_set_ext_vcc(struct peak_usb_device *dev, u8 onoff)
254{
255 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
256 [0] = !!onoff,
257 };
258
259 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_EXT_VCC, PCAN_USB_SET, args);
260}
261
262static int pcan_usb_set_led(struct peak_usb_device *dev, u8 onoff)
263{
264 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
265 [0] = !!onoff,
266 };
267
268 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_LED, PCAN_USB_SET, args);
269}
270
271/*
272 * set bittiming value to can
273 */
274static int pcan_usb_set_bittiming(struct peak_usb_device *dev,
275 struct can_bittiming *bt)
276{
277 u8 args[PCAN_USB_CMD_ARGS_LEN];
278 u8 btr0, btr1;
279
280 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
281 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
282 (((bt->phase_seg2 - 1) & 0x7) << 4);
283 if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
284 btr1 |= 0x80;
285
286 netdev_info(dev->netdev, "setting BTR0=0x%02x BTR1=0x%02x\n",
287 btr0, btr1);
288
289 args[0] = btr1;
290 args[1] = btr0;
291
292 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_BITRATE, PCAN_USB_SET, args);
293}
294
295/*
296 * init/reset can
297 */
298static int pcan_usb_write_mode(struct peak_usb_device *dev, u8 onoff)
299{
300 int err;
301
302 err = pcan_usb_set_bus(dev, onoff);
303 if (err)
304 return err;
305
306 if (!onoff) {
307 err = pcan_usb_set_sja1000(dev, SJA1000_MODE_INIT);
308 } else {
309 /* the PCAN-USB needs time to init */
310 set_current_state(TASK_INTERRUPTIBLE);
311 schedule_timeout(msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
312 }
313
314 return err;
315}
316
317/*
318 * handle end of waiting for the device to reset
319 */
320static void pcan_usb_restart(struct timer_list *t)
321{
322 struct pcan_usb *pdev = from_timer(pdev, t, restart_timer);
323 struct peak_usb_device *dev = &pdev->dev;
324
325 /* notify candev and netdev */
326 peak_usb_restart_complete(dev);
327}
328
329/*
330 * handle the submission of the restart urb
331 */
332static void pcan_usb_restart_pending(struct urb *urb)
333{
334 struct pcan_usb *pdev = urb->context;
335
336 /* the PCAN-USB needs time to restart */
337 mod_timer(&pdev->restart_timer,
338 jiffies + msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
339
340 /* can delete usb resources */
341 peak_usb_async_complete(urb);
342}
343
344/*
345 * handle asynchronous restart
346 */
347static int pcan_usb_restart_async(struct peak_usb_device *dev, struct urb *urb,
348 u8 *buf)
349{
350 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
351
352 if (timer_pending(&pdev->restart_timer))
353 return -EBUSY;
354
355 /* set bus on */
356 buf[PCAN_USB_CMD_FUNC] = 3;
357 buf[PCAN_USB_CMD_NUM] = 2;
358 buf[PCAN_USB_CMD_ARGS] = 1;
359
360 usb_fill_bulk_urb(urb, dev->udev,
361 usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
362 buf, PCAN_USB_CMD_LEN,
363 pcan_usb_restart_pending, pdev);
364
365 return usb_submit_urb(urb, GFP_ATOMIC);
366}
367
368/*
369 * read serial number from device
370 */
371static int pcan_usb_get_serial(struct peak_usb_device *dev, u32 *serial_number)
372{
373 u8 args[PCAN_USB_CMD_ARGS_LEN];
374 int err;
375
376 err = pcan_usb_wait_rsp(dev, PCAN_USB_CMD_SN, PCAN_USB_GET, args);
377 if (err)
378 return err;
379 *serial_number = le32_to_cpup((__le32 *)args);
380
381 return 0;
382}
383
384/*
385 * read can channel id from device
386 */
387static int pcan_usb_get_can_channel_id(struct peak_usb_device *dev, u32 *can_ch_id)
388{
389 u8 args[PCAN_USB_CMD_ARGS_LEN];
390 int err;
391
392 err = pcan_usb_wait_rsp(dev, PCAN_USB_CMD_DEVID, PCAN_USB_GET, args);
393 if (err)
394 netdev_err(dev->netdev, "getting can channel id failure: %d\n", err);
395
396 else
397 *can_ch_id = args[0];
398
399 return err;
400}
401
402/* set a new CAN channel id in the flash memory of the device */
403static int pcan_usb_set_can_channel_id(struct peak_usb_device *dev, u32 can_ch_id)
404{
405 u8 args[PCAN_USB_CMD_ARGS_LEN];
406
407 /* this kind of device supports 8-bit values only */
408 if (can_ch_id > U8_MAX)
409 return -EINVAL;
410
411 /* during the flash process the device disconnects during ~1.25 s.:
412 * prohibit access when interface is UP
413 */
414 if (dev->netdev->flags & IFF_UP)
415 return -EBUSY;
416
417 args[0] = can_ch_id;
418 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_DEVID, PCAN_USB_SET, args);
419}
420
421/*
422 * update current time ref with received timestamp
423 */
424static int pcan_usb_update_ts(struct pcan_usb_msg_context *mc)
425{
426 if ((mc->ptr + 2) > mc->end)
427 return -EINVAL;
428
429 mc->ts16 = get_unaligned_le16(mc->ptr);
430
431 if (mc->rec_idx > 0)
432 peak_usb_update_ts_now(&mc->pdev->time_ref, mc->ts16);
433 else
434 peak_usb_set_ts_now(&mc->pdev->time_ref, mc->ts16);
435
436 return 0;
437}
438
439/*
440 * decode received timestamp
441 */
442static int pcan_usb_decode_ts(struct pcan_usb_msg_context *mc, u8 first_packet)
443{
444 /* only 1st packet supplies a word timestamp */
445 if (first_packet) {
446 if ((mc->ptr + 2) > mc->end)
447 return -EINVAL;
448
449 mc->ts16 = get_unaligned_le16(mc->ptr);
450 mc->prev_ts8 = mc->ts16 & 0x00ff;
451
452 mc->ptr += 2;
453 } else {
454 u8 ts8;
455
456 if ((mc->ptr + 1) > mc->end)
457 return -EINVAL;
458
459 ts8 = *mc->ptr++;
460
461 if (ts8 < mc->prev_ts8)
462 mc->ts16 += 0x100;
463
464 mc->ts16 &= 0xff00;
465 mc->ts16 |= ts8;
466 mc->prev_ts8 = ts8;
467 }
468
469 return 0;
470}
471
472static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
473 u8 status_len)
474{
475 struct sk_buff *skb;
476 struct can_frame *cf;
477 enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
478
479 /* ignore this error until 1st ts received */
480 if (n == PCAN_USB_ERROR_QOVR)
481 if (!mc->pdev->time_ref.tick_count)
482 return 0;
483
484 /* allocate an skb to store the error frame */
485 skb = alloc_can_err_skb(mc->netdev, &cf);
486
487 if (n & PCAN_USB_ERROR_RXQOVR) {
488 /* data overrun interrupt */
489 netdev_dbg(mc->netdev, "data overrun interrupt\n");
490 mc->netdev->stats.rx_over_errors++;
491 mc->netdev->stats.rx_errors++;
492 if (cf) {
493 cf->can_id |= CAN_ERR_CRTL;
494 cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
495 }
496 }
497
498 if (n & PCAN_USB_ERROR_TXQFULL)
499 netdev_dbg(mc->netdev, "device Tx queue full)\n");
500
501 if (n & PCAN_USB_ERROR_BUS_OFF) {
502 new_state = CAN_STATE_BUS_OFF;
503 } else if (n & PCAN_USB_ERROR_BUS_HEAVY) {
504 new_state = ((mc->pdev->bec.txerr >= 128) ||
505 (mc->pdev->bec.rxerr >= 128)) ?
506 CAN_STATE_ERROR_PASSIVE :
507 CAN_STATE_ERROR_WARNING;
508 } else {
509 new_state = CAN_STATE_ERROR_ACTIVE;
510 }
511
512 /* handle change of state */
513 if (new_state != mc->pdev->dev.can.state) {
514 enum can_state tx_state =
515 (mc->pdev->bec.txerr >= mc->pdev->bec.rxerr) ?
516 new_state : 0;
517 enum can_state rx_state =
518 (mc->pdev->bec.txerr <= mc->pdev->bec.rxerr) ?
519 new_state : 0;
520
521 can_change_state(mc->netdev, cf, tx_state, rx_state);
522
523 if (new_state == CAN_STATE_BUS_OFF) {
524 can_bus_off(mc->netdev);
525 } else if (cf && (cf->can_id & CAN_ERR_CRTL)) {
526 /* Supply TX/RX error counters in case of
527 * controller error.
528 */
529 cf->can_id = CAN_ERR_CNT;
530 cf->data[6] = mc->pdev->bec.txerr;
531 cf->data[7] = mc->pdev->bec.rxerr;
532 }
533 }
534
535 if (!skb)
536 return -ENOMEM;
537
538 if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
539 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
540
541 peak_usb_get_ts_time(&mc->pdev->time_ref, mc->ts16,
542 &hwts->hwtstamp);
543 }
544
545 netif_rx(skb);
546
547 return 0;
548}
549
550/* decode bus event usb packet: first byte contains rxerr while 2nd one contains
551 * txerr.
552 */
553static int pcan_usb_handle_bus_evt(struct pcan_usb_msg_context *mc, u8 ir)
554{
555 struct pcan_usb *pdev = mc->pdev;
556
557 /* according to the content of the packet */
558 switch (ir) {
559 case PCAN_USB_ERR_CNT_DEC:
560 case PCAN_USB_ERR_CNT_INC:
561
562 /* save rx/tx error counters from in the device context */
563 pdev->bec.rxerr = mc->ptr[1];
564 pdev->bec.txerr = mc->ptr[2];
565 break;
566
567 default:
568 /* reserved */
569 break;
570 }
571
572 return 0;
573}
574
575/*
576 * decode non-data usb message
577 */
578static int pcan_usb_decode_status(struct pcan_usb_msg_context *mc,
579 u8 status_len)
580{
581 u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
582 u8 f, n;
583 int err;
584
585 /* check whether function and number can be read */
586 if ((mc->ptr + 2) > mc->end)
587 return -EINVAL;
588
589 f = mc->ptr[PCAN_USB_CMD_FUNC];
590 n = mc->ptr[PCAN_USB_CMD_NUM];
591 mc->ptr += PCAN_USB_CMD_ARGS;
592
593 if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
594 int err = pcan_usb_decode_ts(mc, !mc->rec_ts_idx);
595
596 if (err)
597 return err;
598
599 /* Next packet in the buffer will have a timestamp on a single
600 * byte
601 */
602 mc->rec_ts_idx++;
603 }
604
605 switch (f) {
606 case PCAN_USB_REC_ERROR:
607 err = pcan_usb_decode_error(mc, n, status_len);
608 if (err)
609 return err;
610 break;
611
612 case PCAN_USB_REC_ANALOG:
613 /* analog values (ignored) */
614 rec_len = 2;
615 break;
616
617 case PCAN_USB_REC_BUSLOAD:
618 /* bus load (ignored) */
619 rec_len = 1;
620 break;
621
622 case PCAN_USB_REC_TS:
623 /* only timestamp */
624 if (pcan_usb_update_ts(mc))
625 return -EINVAL;
626 break;
627
628 case PCAN_USB_REC_BUSEVT:
629 /* bus event notifications (get rxerr/txerr) */
630 err = pcan_usb_handle_bus_evt(mc, n);
631 if (err)
632 return err;
633 break;
634 default:
635 netdev_err(mc->netdev, "unexpected function %u\n", f);
636 break;
637 }
638
639 if ((mc->ptr + rec_len) > mc->end)
640 return -EINVAL;
641
642 mc->ptr += rec_len;
643
644 return 0;
645}
646
647/*
648 * decode data usb message
649 */
650static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
651{
652 u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
653 struct sk_buff *skb;
654 struct can_frame *cf;
655 struct skb_shared_hwtstamps *hwts;
656 u32 can_id_flags;
657
658 skb = alloc_can_skb(mc->netdev, &cf);
659 if (!skb)
660 return -ENOMEM;
661
662 if (status_len & PCAN_USB_STATUSLEN_EXT_ID) {
663 if ((mc->ptr + 4) > mc->end)
664 goto decode_failed;
665
666 can_id_flags = get_unaligned_le32(mc->ptr);
667 cf->can_id = can_id_flags >> 3 | CAN_EFF_FLAG;
668 mc->ptr += 4;
669 } else {
670 if ((mc->ptr + 2) > mc->end)
671 goto decode_failed;
672
673 can_id_flags = get_unaligned_le16(mc->ptr);
674 cf->can_id = can_id_flags >> 5;
675 mc->ptr += 2;
676 }
677
678 can_frame_set_cc_len(cf, rec_len, mc->pdev->dev.can.ctrlmode);
679
680 /* Only first packet timestamp is a word */
681 if (pcan_usb_decode_ts(mc, !mc->rec_ts_idx))
682 goto decode_failed;
683
684 /* Next packet in the buffer will have a timestamp on a single byte */
685 mc->rec_ts_idx++;
686
687 /* read data */
688 memset(cf->data, 0x0, sizeof(cf->data));
689 if (status_len & PCAN_USB_STATUSLEN_RTR) {
690 cf->can_id |= CAN_RTR_FLAG;
691 } else {
692 if ((mc->ptr + rec_len) > mc->end)
693 goto decode_failed;
694
695 memcpy(cf->data, mc->ptr, cf->len);
696 mc->ptr += rec_len;
697
698 /* Ignore next byte (client private id) if SRR bit is set */
699 if (can_id_flags & PCAN_USB_TX_SRR)
700 mc->ptr++;
701
702 /* update statistics */
703 mc->netdev->stats.rx_bytes += cf->len;
704 }
705 mc->netdev->stats.rx_packets++;
706
707 /* convert timestamp into kernel time */
708 hwts = skb_hwtstamps(skb);
709 peak_usb_get_ts_time(&mc->pdev->time_ref, mc->ts16, &hwts->hwtstamp);
710
711 /* push the skb */
712 netif_rx(skb);
713
714 return 0;
715
716decode_failed:
717 dev_kfree_skb(skb);
718 return -EINVAL;
719}
720
721/*
722 * process incoming message
723 */
724static int pcan_usb_decode_msg(struct peak_usb_device *dev, u8 *ibuf, u32 lbuf)
725{
726 struct pcan_usb_msg_context mc = {
727 .rec_cnt = ibuf[1],
728 .ptr = ibuf + PCAN_USB_MSG_HEADER_LEN,
729 .end = ibuf + lbuf,
730 .netdev = dev->netdev,
731 .pdev = container_of(dev, struct pcan_usb, dev),
732 };
733 int err;
734
735 for (err = 0; mc.rec_idx < mc.rec_cnt && !err; mc.rec_idx++) {
736 u8 sl = *mc.ptr++;
737
738 /* handle status and error frames here */
739 if (sl & PCAN_USB_STATUSLEN_INTERNAL) {
740 err = pcan_usb_decode_status(&mc, sl);
741 /* handle normal can frames here */
742 } else {
743 err = pcan_usb_decode_data(&mc, sl);
744 }
745 }
746
747 return err;
748}
749
750/*
751 * process any incoming buffer
752 */
753static int pcan_usb_decode_buf(struct peak_usb_device *dev, struct urb *urb)
754{
755 int err = 0;
756
757 if (urb->actual_length > PCAN_USB_MSG_HEADER_LEN) {
758 err = pcan_usb_decode_msg(dev, urb->transfer_buffer,
759 urb->actual_length);
760
761 } else if (urb->actual_length > 0) {
762 netdev_err(dev->netdev, "usb message length error (%u)\n",
763 urb->actual_length);
764 err = -EINVAL;
765 }
766
767 return err;
768}
769
770/*
771 * process outgoing packet
772 */
773static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb,
774 u8 *obuf, size_t *size)
775{
776 struct net_device *netdev = dev->netdev;
777 struct net_device_stats *stats = &netdev->stats;
778 struct can_frame *cf = (struct can_frame *)skb->data;
779 u32 can_id_flags = cf->can_id & CAN_ERR_MASK;
780 u8 *pc;
781
782 obuf[0] = PCAN_USB_MSG_TX_CAN;
783 obuf[1] = 1; /* only one CAN frame is stored in the packet */
784
785 pc = obuf + PCAN_USB_MSG_HEADER_LEN;
786
787 /* status/len byte */
788 *pc = can_get_cc_dlc(cf, dev->can.ctrlmode);
789
790 if (cf->can_id & CAN_RTR_FLAG)
791 *pc |= PCAN_USB_STATUSLEN_RTR;
792
793 /* can id */
794 if (cf->can_id & CAN_EFF_FLAG) {
795 *pc |= PCAN_USB_STATUSLEN_EXT_ID;
796 pc++;
797
798 can_id_flags <<= 3;
799
800 if (dev->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
801 can_id_flags |= PCAN_USB_TX_SRR;
802
803 if (dev->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
804 can_id_flags |= PCAN_USB_TX_AT;
805
806 put_unaligned_le32(can_id_flags, pc);
807 pc += 4;
808 } else {
809 pc++;
810
811 can_id_flags <<= 5;
812
813 if (dev->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
814 can_id_flags |= PCAN_USB_TX_SRR;
815
816 if (dev->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
817 can_id_flags |= PCAN_USB_TX_AT;
818
819 put_unaligned_le16(can_id_flags, pc);
820 pc += 2;
821 }
822
823 /* can data */
824 if (!(cf->can_id & CAN_RTR_FLAG)) {
825 memcpy(pc, cf->data, cf->len);
826 pc += cf->len;
827 }
828
829 /* SRR bit needs a writer id (useless here) */
830 if (can_id_flags & PCAN_USB_TX_SRR)
831 *pc++ = 0x80;
832
833 obuf[(*size)-1] = (u8)(stats->tx_packets & 0xff);
834
835 return 0;
836}
837
838/* socket callback used to copy berr counters values received through USB */
839static int pcan_usb_get_berr_counter(const struct net_device *netdev,
840 struct can_berr_counter *bec)
841{
842 struct peak_usb_device *dev = netdev_priv(netdev);
843 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
844
845 *bec = pdev->bec;
846
847 /* must return 0 */
848 return 0;
849}
850
851/*
852 * start interface
853 */
854static int pcan_usb_start(struct peak_usb_device *dev)
855{
856 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
857 int err;
858
859 /* number of bits used in timestamps read from adapter struct */
860 peak_usb_init_time_ref(&pdev->time_ref, &pcan_usb);
861
862 pdev->bec.rxerr = 0;
863 pdev->bec.txerr = 0;
864
865 /* always ask the device for BERR reporting, to be able to switch from
866 * WARNING to PASSIVE state
867 */
868 err = pcan_usb_set_err_frame(dev, PCAN_USB_BERR_MASK);
869 if (err)
870 netdev_warn(dev->netdev,
871 "Asking for BERR reporting error %u\n",
872 err);
873
874 /* if revision greater than 3, can put silent mode on/off */
875 if (dev->device_rev > 3) {
876 err = pcan_usb_set_silent(dev,
877 dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
878 if (err)
879 return err;
880 }
881
882 return pcan_usb_set_ext_vcc(dev, 0);
883}
884
885static int pcan_usb_init(struct peak_usb_device *dev)
886{
887 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
888 u32 serial_number;
889 int err;
890
891 /* initialize a timer needed to wait for hardware restart */
892 timer_setup(&pdev->restart_timer, pcan_usb_restart, 0);
893
894 /*
895 * explicit use of dev_xxx() instead of netdev_xxx() here:
896 * information displayed are related to the device itself, not
897 * to the canx netdevice.
898 */
899 err = pcan_usb_get_serial(dev, &serial_number);
900 if (err) {
901 dev_err(dev->netdev->dev.parent,
902 "unable to read %s serial number (err %d)\n",
903 pcan_usb.name, err);
904 return err;
905 }
906
907 dev_info(dev->netdev->dev.parent,
908 "PEAK-System %s adapter hwrev %u serial %08X (%u channel)\n",
909 pcan_usb.name, dev->device_rev, serial_number,
910 pcan_usb.ctrl_count);
911
912 /* Since rev 4.1, PCAN-USB is able to make single-shot as well as
913 * looped back frames.
914 */
915 if (dev->device_rev >= 41) {
916 struct can_priv *priv = netdev_priv(dev->netdev);
917
918 priv->ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT |
919 CAN_CTRLMODE_LOOPBACK;
920 } else {
921 dev_info(dev->netdev->dev.parent,
922 "Firmware update available. Please contact support@peak-system.com\n");
923 }
924
925 return 0;
926}
927
928/*
929 * probe function for new PCAN-USB usb interface
930 */
931static int pcan_usb_probe(struct usb_interface *intf)
932{
933 struct usb_host_interface *if_desc;
934 int i;
935
936 if_desc = intf->altsetting;
937
938 /* check interface endpoint addresses */
939 for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
940 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
941
942 switch (ep->bEndpointAddress) {
943 case PCAN_USB_EP_CMDOUT:
944 case PCAN_USB_EP_CMDIN:
945 case PCAN_USB_EP_MSGOUT:
946 case PCAN_USB_EP_MSGIN:
947 break;
948 default:
949 return -ENODEV;
950 }
951 }
952
953 return 0;
954}
955
956static int pcan_usb_set_phys_id(struct net_device *netdev,
957 enum ethtool_phys_id_state state)
958{
959 struct peak_usb_device *dev = netdev_priv(netdev);
960 int err = 0;
961
962 switch (state) {
963 case ETHTOOL_ID_ACTIVE:
964 /* call ON/OFF twice a second */
965 return 2;
966
967 case ETHTOOL_ID_OFF:
968 err = pcan_usb_set_led(dev, 0);
969 break;
970
971 case ETHTOOL_ID_ON:
972 fallthrough;
973
974 case ETHTOOL_ID_INACTIVE:
975 /* restore LED default */
976 err = pcan_usb_set_led(dev, 1);
977 break;
978
979 default:
980 break;
981 }
982
983 return err;
984}
985
986/* This device only handles 8-bit CAN channel id. */
987static int pcan_usb_get_eeprom_len(struct net_device *netdev)
988{
989 return sizeof(u8);
990}
991
992static const struct ethtool_ops pcan_usb_ethtool_ops = {
993 .set_phys_id = pcan_usb_set_phys_id,
994 .get_ts_info = pcan_get_ts_info,
995 .get_eeprom_len = pcan_usb_get_eeprom_len,
996 .get_eeprom = peak_usb_get_eeprom,
997 .set_eeprom = peak_usb_set_eeprom,
998};
999
1000/*
1001 * describe the PCAN-USB adapter
1002 */
1003static const struct can_bittiming_const pcan_usb_const = {
1004 .name = "pcan_usb",
1005 .tseg1_min = 1,
1006 .tseg1_max = 16,
1007 .tseg2_min = 1,
1008 .tseg2_max = 8,
1009 .sjw_max = 4,
1010 .brp_min = 1,
1011 .brp_max = 64,
1012 .brp_inc = 1,
1013};
1014
1015const struct peak_usb_adapter pcan_usb = {
1016 .name = "PCAN-USB",
1017 .device_id = PCAN_USB_PRODUCT_ID,
1018 .ctrl_count = 1,
1019 .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY |
1020 CAN_CTRLMODE_CC_LEN8_DLC,
1021 .clock = {
1022 .freq = PCAN_USB_CRYSTAL_HZ / 2,
1023 },
1024 .bittiming_const = &pcan_usb_const,
1025
1026 /* size of device private data */
1027 .sizeof_dev_private = sizeof(struct pcan_usb),
1028
1029 .ethtool_ops = &pcan_usb_ethtool_ops,
1030
1031 /* timestamps usage */
1032 .ts_used_bits = 16,
1033 .us_per_ts_scale = PCAN_USB_TS_US_PER_TICK, /* us=(ts*scale) */
1034 .us_per_ts_shift = PCAN_USB_TS_DIV_SHIFTER, /* >> shift */
1035
1036 /* give here messages in/out endpoints */
1037 .ep_msg_in = PCAN_USB_EP_MSGIN,
1038 .ep_msg_out = {PCAN_USB_EP_MSGOUT},
1039
1040 /* size of rx/tx usb buffers */
1041 .rx_buffer_size = PCAN_USB_RX_BUFFER_SIZE,
1042 .tx_buffer_size = PCAN_USB_TX_BUFFER_SIZE,
1043
1044 /* device callbacks */
1045 .intf_probe = pcan_usb_probe,
1046 .dev_init = pcan_usb_init,
1047 .dev_set_bus = pcan_usb_write_mode,
1048 .dev_set_bittiming = pcan_usb_set_bittiming,
1049 .dev_get_can_channel_id = pcan_usb_get_can_channel_id,
1050 .dev_set_can_channel_id = pcan_usb_set_can_channel_id,
1051 .dev_decode_buf = pcan_usb_decode_buf,
1052 .dev_encode_msg = pcan_usb_encode_msg,
1053 .dev_start = pcan_usb_start,
1054 .dev_restart_async = pcan_usb_restart_async,
1055 .do_get_berr_counter = pcan_usb_get_berr_counter,
1056};
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * CAN driver for PEAK System PCAN-USB adapter
4 * Derived from the PCAN project file driver/src/pcan_usb.c
5 *
6 * Copyright (C) 2003-2010 PEAK System-Technik GmbH
7 * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com>
8 *
9 * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de>
10 */
11#include <asm/unaligned.h>
12#include <linux/netdevice.h>
13#include <linux/usb.h>
14#include <linux/module.h>
15#include <linux/ethtool.h>
16
17#include <linux/can.h>
18#include <linux/can/dev.h>
19#include <linux/can/error.h>
20
21#include "pcan_usb_core.h"
22
23/* PCAN-USB Endpoints */
24#define PCAN_USB_EP_CMDOUT 1
25#define PCAN_USB_EP_CMDIN (PCAN_USB_EP_CMDOUT | USB_DIR_IN)
26#define PCAN_USB_EP_MSGOUT 2
27#define PCAN_USB_EP_MSGIN (PCAN_USB_EP_MSGOUT | USB_DIR_IN)
28
29/* PCAN-USB command struct */
30#define PCAN_USB_CMD_FUNC 0
31#define PCAN_USB_CMD_NUM 1
32#define PCAN_USB_CMD_ARGS 2
33#define PCAN_USB_CMD_ARGS_LEN 14
34#define PCAN_USB_CMD_LEN (PCAN_USB_CMD_ARGS + \
35 PCAN_USB_CMD_ARGS_LEN)
36
37/* PCAN-USB commands */
38#define PCAN_USB_CMD_BITRATE 1
39#define PCAN_USB_CMD_SET_BUS 3
40#define PCAN_USB_CMD_DEVID 4
41#define PCAN_USB_CMD_SN 6
42#define PCAN_USB_CMD_REGISTER 9
43#define PCAN_USB_CMD_EXT_VCC 10
44#define PCAN_USB_CMD_ERR_FR 11
45#define PCAN_USB_CMD_LED 12
46
47/* PCAN_USB_CMD_SET_BUS number arg */
48#define PCAN_USB_BUS_XCVER 2
49#define PCAN_USB_BUS_SILENT_MODE 3
50
51/* PCAN_USB_CMD_xxx functions */
52#define PCAN_USB_GET 1
53#define PCAN_USB_SET 2
54
55/* PCAN-USB command timeout (ms.) */
56#define PCAN_USB_COMMAND_TIMEOUT 1000
57
58/* PCAN-USB startup timeout (ms.) */
59#define PCAN_USB_STARTUP_TIMEOUT 10
60
61/* PCAN-USB rx/tx buffers size */
62#define PCAN_USB_RX_BUFFER_SIZE 64
63#define PCAN_USB_TX_BUFFER_SIZE 64
64
65#define PCAN_USB_MSG_HEADER_LEN 2
66
67#define PCAN_USB_MSG_TX_CAN 2 /* Tx msg is a CAN frame */
68
69/* PCAN-USB adapter internal clock (MHz) */
70#define PCAN_USB_CRYSTAL_HZ 16000000
71
72/* PCAN-USB USB message record status/len field */
73#define PCAN_USB_STATUSLEN_TIMESTAMP (1 << 7)
74#define PCAN_USB_STATUSLEN_INTERNAL (1 << 6)
75#define PCAN_USB_STATUSLEN_EXT_ID (1 << 5)
76#define PCAN_USB_STATUSLEN_RTR (1 << 4)
77#define PCAN_USB_STATUSLEN_DLC (0xf)
78
79/* PCAN-USB 4.1 CAN Id tx extended flags */
80#define PCAN_USB_TX_SRR 0x01 /* SJA1000 SRR command */
81#define PCAN_USB_TX_AT 0x02 /* SJA1000 AT command */
82
83/* PCAN-USB error flags */
84#define PCAN_USB_ERROR_TXFULL 0x01
85#define PCAN_USB_ERROR_RXQOVR 0x02
86#define PCAN_USB_ERROR_BUS_LIGHT 0x04
87#define PCAN_USB_ERROR_BUS_HEAVY 0x08
88#define PCAN_USB_ERROR_BUS_OFF 0x10
89#define PCAN_USB_ERROR_RXQEMPTY 0x20
90#define PCAN_USB_ERROR_QOVR 0x40
91#define PCAN_USB_ERROR_TXQFULL 0x80
92
93#define PCAN_USB_ERROR_BUS (PCAN_USB_ERROR_BUS_LIGHT | \
94 PCAN_USB_ERROR_BUS_HEAVY | \
95 PCAN_USB_ERROR_BUS_OFF)
96
97/* SJA1000 modes */
98#define SJA1000_MODE_NORMAL 0x00
99#define SJA1000_MODE_INIT 0x01
100
101/*
102 * tick duration = 42.666 us =>
103 * (tick_number * 44739243) >> 20 ~ (tick_number * 42666) / 1000
104 * accuracy = 10^-7
105 */
106#define PCAN_USB_TS_DIV_SHIFTER 20
107#define PCAN_USB_TS_US_PER_TICK 44739243
108
109/* PCAN-USB messages record types */
110#define PCAN_USB_REC_ERROR 1
111#define PCAN_USB_REC_ANALOG 2
112#define PCAN_USB_REC_BUSLOAD 3
113#define PCAN_USB_REC_TS 4
114#define PCAN_USB_REC_BUSEVT 5
115
116/* CAN bus events notifications selection mask */
117#define PCAN_USB_ERR_RXERR 0x02 /* ask for rxerr counter */
118#define PCAN_USB_ERR_TXERR 0x04 /* ask for txerr counter */
119
120/* This mask generates an usb packet each time the state of the bus changes.
121 * In other words, its interest is to know which side among rx and tx is
122 * responsible of the change of the bus state.
123 */
124#define PCAN_USB_BERR_MASK (PCAN_USB_ERR_RXERR | PCAN_USB_ERR_TXERR)
125
126/* identify bus event packets with rx/tx error counters */
127#define PCAN_USB_ERR_CNT_DEC 0x00 /* counters are decreasing */
128#define PCAN_USB_ERR_CNT_INC 0x80 /* counters are increasing */
129
130/* private to PCAN-USB adapter */
131struct pcan_usb {
132 struct peak_usb_device dev;
133 struct peak_time_ref time_ref;
134 struct timer_list restart_timer;
135 struct can_berr_counter bec;
136};
137
138/* incoming message context for decoding */
139struct pcan_usb_msg_context {
140 u16 ts16;
141 u8 prev_ts8;
142 u8 *ptr;
143 u8 *end;
144 u8 rec_cnt;
145 u8 rec_idx;
146 u8 rec_ts_idx;
147 struct net_device *netdev;
148 struct pcan_usb *pdev;
149};
150
151/*
152 * send a command
153 */
154static int pcan_usb_send_cmd(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
155{
156 int err;
157 int actual_length;
158
159 /* usb device unregistered? */
160 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
161 return 0;
162
163 dev->cmd_buf[PCAN_USB_CMD_FUNC] = f;
164 dev->cmd_buf[PCAN_USB_CMD_NUM] = n;
165
166 if (p)
167 memcpy(dev->cmd_buf + PCAN_USB_CMD_ARGS,
168 p, PCAN_USB_CMD_ARGS_LEN);
169
170 err = usb_bulk_msg(dev->udev,
171 usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
172 dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
173 PCAN_USB_COMMAND_TIMEOUT);
174 if (err)
175 netdev_err(dev->netdev,
176 "sending cmd f=0x%x n=0x%x failure: %d\n",
177 f, n, err);
178 return err;
179}
180
181/*
182 * send a command then wait for its response
183 */
184static int pcan_usb_wait_rsp(struct peak_usb_device *dev, u8 f, u8 n, u8 *p)
185{
186 int err;
187 int actual_length;
188
189 /* usb device unregistered? */
190 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
191 return 0;
192
193 /* first, send command */
194 err = pcan_usb_send_cmd(dev, f, n, NULL);
195 if (err)
196 return err;
197
198 err = usb_bulk_msg(dev->udev,
199 usb_rcvbulkpipe(dev->udev, PCAN_USB_EP_CMDIN),
200 dev->cmd_buf, PCAN_USB_CMD_LEN, &actual_length,
201 PCAN_USB_COMMAND_TIMEOUT);
202 if (err)
203 netdev_err(dev->netdev,
204 "waiting rsp f=0x%x n=0x%x failure: %d\n", f, n, err);
205 else if (p)
206 memcpy(p, dev->cmd_buf + PCAN_USB_CMD_ARGS,
207 PCAN_USB_CMD_ARGS_LEN);
208
209 return err;
210}
211
212static int pcan_usb_set_sja1000(struct peak_usb_device *dev, u8 mode)
213{
214 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
215 [1] = mode,
216 };
217
218 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_REGISTER, PCAN_USB_SET,
219 args);
220}
221
222static int pcan_usb_set_bus(struct peak_usb_device *dev, u8 onoff)
223{
224 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
225 [0] = !!onoff,
226 };
227
228 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_SET_BUS, PCAN_USB_BUS_XCVER,
229 args);
230}
231
232static int pcan_usb_set_silent(struct peak_usb_device *dev, u8 onoff)
233{
234 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
235 [0] = !!onoff,
236 };
237
238 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_SET_BUS,
239 PCAN_USB_BUS_SILENT_MODE, args);
240}
241
242/* send the cmd to be notified from bus errors */
243static int pcan_usb_set_err_frame(struct peak_usb_device *dev, u8 err_mask)
244{
245 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
246 [0] = err_mask,
247 };
248
249 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_ERR_FR, PCAN_USB_SET, args);
250}
251
252static int pcan_usb_set_ext_vcc(struct peak_usb_device *dev, u8 onoff)
253{
254 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
255 [0] = !!onoff,
256 };
257
258 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_EXT_VCC, PCAN_USB_SET, args);
259}
260
261static int pcan_usb_set_led(struct peak_usb_device *dev, u8 onoff)
262{
263 u8 args[PCAN_USB_CMD_ARGS_LEN] = {
264 [0] = !!onoff,
265 };
266
267 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_LED, PCAN_USB_SET, args);
268}
269
270/*
271 * set bittiming value to can
272 */
273static int pcan_usb_set_bittiming(struct peak_usb_device *dev,
274 struct can_bittiming *bt)
275{
276 u8 args[PCAN_USB_CMD_ARGS_LEN];
277 u8 btr0, btr1;
278
279 btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
280 btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
281 (((bt->phase_seg2 - 1) & 0x7) << 4);
282 if (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
283 btr1 |= 0x80;
284
285 netdev_info(dev->netdev, "setting BTR0=0x%02x BTR1=0x%02x\n",
286 btr0, btr1);
287
288 args[0] = btr1;
289 args[1] = btr0;
290
291 return pcan_usb_send_cmd(dev, PCAN_USB_CMD_BITRATE, PCAN_USB_SET, args);
292}
293
294/*
295 * init/reset can
296 */
297static int pcan_usb_write_mode(struct peak_usb_device *dev, u8 onoff)
298{
299 int err;
300
301 err = pcan_usb_set_bus(dev, onoff);
302 if (err)
303 return err;
304
305 if (!onoff) {
306 err = pcan_usb_set_sja1000(dev, SJA1000_MODE_INIT);
307 } else {
308 /* the PCAN-USB needs time to init */
309 set_current_state(TASK_INTERRUPTIBLE);
310 schedule_timeout(msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
311 }
312
313 return err;
314}
315
316/*
317 * handle end of waiting for the device to reset
318 */
319static void pcan_usb_restart(struct timer_list *t)
320{
321 struct pcan_usb *pdev = from_timer(pdev, t, restart_timer);
322 struct peak_usb_device *dev = &pdev->dev;
323
324 /* notify candev and netdev */
325 peak_usb_restart_complete(dev);
326}
327
328/*
329 * handle the submission of the restart urb
330 */
331static void pcan_usb_restart_pending(struct urb *urb)
332{
333 struct pcan_usb *pdev = urb->context;
334
335 /* the PCAN-USB needs time to restart */
336 mod_timer(&pdev->restart_timer,
337 jiffies + msecs_to_jiffies(PCAN_USB_STARTUP_TIMEOUT));
338
339 /* can delete usb resources */
340 peak_usb_async_complete(urb);
341}
342
343/*
344 * handle asynchronous restart
345 */
346static int pcan_usb_restart_async(struct peak_usb_device *dev, struct urb *urb,
347 u8 *buf)
348{
349 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
350
351 if (timer_pending(&pdev->restart_timer))
352 return -EBUSY;
353
354 /* set bus on */
355 buf[PCAN_USB_CMD_FUNC] = 3;
356 buf[PCAN_USB_CMD_NUM] = 2;
357 buf[PCAN_USB_CMD_ARGS] = 1;
358
359 usb_fill_bulk_urb(urb, dev->udev,
360 usb_sndbulkpipe(dev->udev, PCAN_USB_EP_CMDOUT),
361 buf, PCAN_USB_CMD_LEN,
362 pcan_usb_restart_pending, pdev);
363
364 return usb_submit_urb(urb, GFP_ATOMIC);
365}
366
367/*
368 * read serial number from device
369 */
370static int pcan_usb_get_serial(struct peak_usb_device *dev, u32 *serial_number)
371{
372 u8 args[PCAN_USB_CMD_ARGS_LEN];
373 int err;
374
375 err = pcan_usb_wait_rsp(dev, PCAN_USB_CMD_SN, PCAN_USB_GET, args);
376 if (err)
377 return err;
378 *serial_number = le32_to_cpup((__le32 *)args);
379
380 return 0;
381}
382
383/*
384 * read device id from device
385 */
386static int pcan_usb_get_device_id(struct peak_usb_device *dev, u32 *device_id)
387{
388 u8 args[PCAN_USB_CMD_ARGS_LEN];
389 int err;
390
391 err = pcan_usb_wait_rsp(dev, PCAN_USB_CMD_DEVID, PCAN_USB_GET, args);
392 if (err)
393 netdev_err(dev->netdev, "getting device id failure: %d\n", err);
394
395 else
396 *device_id = args[0];
397
398 return err;
399}
400
401/*
402 * update current time ref with received timestamp
403 */
404static int pcan_usb_update_ts(struct pcan_usb_msg_context *mc)
405{
406 if ((mc->ptr + 2) > mc->end)
407 return -EINVAL;
408
409 mc->ts16 = get_unaligned_le16(mc->ptr);
410
411 if (mc->rec_idx > 0)
412 peak_usb_update_ts_now(&mc->pdev->time_ref, mc->ts16);
413 else
414 peak_usb_set_ts_now(&mc->pdev->time_ref, mc->ts16);
415
416 return 0;
417}
418
419/*
420 * decode received timestamp
421 */
422static int pcan_usb_decode_ts(struct pcan_usb_msg_context *mc, u8 first_packet)
423{
424 /* only 1st packet supplies a word timestamp */
425 if (first_packet) {
426 if ((mc->ptr + 2) > mc->end)
427 return -EINVAL;
428
429 mc->ts16 = get_unaligned_le16(mc->ptr);
430 mc->prev_ts8 = mc->ts16 & 0x00ff;
431
432 mc->ptr += 2;
433 } else {
434 u8 ts8;
435
436 if ((mc->ptr + 1) > mc->end)
437 return -EINVAL;
438
439 ts8 = *mc->ptr++;
440
441 if (ts8 < mc->prev_ts8)
442 mc->ts16 += 0x100;
443
444 mc->ts16 &= 0xff00;
445 mc->ts16 |= ts8;
446 mc->prev_ts8 = ts8;
447 }
448
449 return 0;
450}
451
452static int pcan_usb_decode_error(struct pcan_usb_msg_context *mc, u8 n,
453 u8 status_len)
454{
455 struct sk_buff *skb;
456 struct can_frame *cf;
457 enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
458
459 /* ignore this error until 1st ts received */
460 if (n == PCAN_USB_ERROR_QOVR)
461 if (!mc->pdev->time_ref.tick_count)
462 return 0;
463
464 /* allocate an skb to store the error frame */
465 skb = alloc_can_err_skb(mc->netdev, &cf);
466
467 if (n & PCAN_USB_ERROR_RXQOVR) {
468 /* data overrun interrupt */
469 netdev_dbg(mc->netdev, "data overrun interrupt\n");
470 mc->netdev->stats.rx_over_errors++;
471 mc->netdev->stats.rx_errors++;
472 if (cf) {
473 cf->can_id |= CAN_ERR_CRTL;
474 cf->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
475 }
476 }
477
478 if (n & PCAN_USB_ERROR_TXQFULL)
479 netdev_dbg(mc->netdev, "device Tx queue full)\n");
480
481 if (n & PCAN_USB_ERROR_BUS_OFF) {
482 new_state = CAN_STATE_BUS_OFF;
483 } else if (n & PCAN_USB_ERROR_BUS_HEAVY) {
484 new_state = ((mc->pdev->bec.txerr >= 128) ||
485 (mc->pdev->bec.rxerr >= 128)) ?
486 CAN_STATE_ERROR_PASSIVE :
487 CAN_STATE_ERROR_WARNING;
488 } else {
489 new_state = CAN_STATE_ERROR_ACTIVE;
490 }
491
492 /* handle change of state */
493 if (new_state != mc->pdev->dev.can.state) {
494 enum can_state tx_state =
495 (mc->pdev->bec.txerr >= mc->pdev->bec.rxerr) ?
496 new_state : 0;
497 enum can_state rx_state =
498 (mc->pdev->bec.txerr <= mc->pdev->bec.rxerr) ?
499 new_state : 0;
500
501 can_change_state(mc->netdev, cf, tx_state, rx_state);
502
503 if (new_state == CAN_STATE_BUS_OFF) {
504 can_bus_off(mc->netdev);
505 } else if (cf && (cf->can_id & CAN_ERR_CRTL)) {
506 /* Supply TX/RX error counters in case of
507 * controller error.
508 */
509 cf->can_id = CAN_ERR_CNT;
510 cf->data[6] = mc->pdev->bec.txerr;
511 cf->data[7] = mc->pdev->bec.rxerr;
512 }
513 }
514
515 if (!skb)
516 return -ENOMEM;
517
518 if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
519 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
520
521 peak_usb_get_ts_time(&mc->pdev->time_ref, mc->ts16,
522 &hwts->hwtstamp);
523 }
524
525 netif_rx(skb);
526
527 return 0;
528}
529
530/* decode bus event usb packet: first byte contains rxerr while 2nd one contains
531 * txerr.
532 */
533static int pcan_usb_handle_bus_evt(struct pcan_usb_msg_context *mc, u8 ir)
534{
535 struct pcan_usb *pdev = mc->pdev;
536
537 /* according to the content of the packet */
538 switch (ir) {
539 case PCAN_USB_ERR_CNT_DEC:
540 case PCAN_USB_ERR_CNT_INC:
541
542 /* save rx/tx error counters from in the device context */
543 pdev->bec.rxerr = mc->ptr[1];
544 pdev->bec.txerr = mc->ptr[2];
545 break;
546
547 default:
548 /* reserved */
549 break;
550 }
551
552 return 0;
553}
554
555/*
556 * decode non-data usb message
557 */
558static int pcan_usb_decode_status(struct pcan_usb_msg_context *mc,
559 u8 status_len)
560{
561 u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
562 u8 f, n;
563 int err;
564
565 /* check whether function and number can be read */
566 if ((mc->ptr + 2) > mc->end)
567 return -EINVAL;
568
569 f = mc->ptr[PCAN_USB_CMD_FUNC];
570 n = mc->ptr[PCAN_USB_CMD_NUM];
571 mc->ptr += PCAN_USB_CMD_ARGS;
572
573 if (status_len & PCAN_USB_STATUSLEN_TIMESTAMP) {
574 int err = pcan_usb_decode_ts(mc, !mc->rec_ts_idx);
575
576 if (err)
577 return err;
578
579 /* Next packet in the buffer will have a timestamp on a single
580 * byte
581 */
582 mc->rec_ts_idx++;
583 }
584
585 switch (f) {
586 case PCAN_USB_REC_ERROR:
587 err = pcan_usb_decode_error(mc, n, status_len);
588 if (err)
589 return err;
590 break;
591
592 case PCAN_USB_REC_ANALOG:
593 /* analog values (ignored) */
594 rec_len = 2;
595 break;
596
597 case PCAN_USB_REC_BUSLOAD:
598 /* bus load (ignored) */
599 rec_len = 1;
600 break;
601
602 case PCAN_USB_REC_TS:
603 /* only timestamp */
604 if (pcan_usb_update_ts(mc))
605 return -EINVAL;
606 break;
607
608 case PCAN_USB_REC_BUSEVT:
609 /* bus event notifications (get rxerr/txerr) */
610 err = pcan_usb_handle_bus_evt(mc, n);
611 if (err)
612 return err;
613 break;
614 default:
615 netdev_err(mc->netdev, "unexpected function %u\n", f);
616 break;
617 }
618
619 if ((mc->ptr + rec_len) > mc->end)
620 return -EINVAL;
621
622 mc->ptr += rec_len;
623
624 return 0;
625}
626
627/*
628 * decode data usb message
629 */
630static int pcan_usb_decode_data(struct pcan_usb_msg_context *mc, u8 status_len)
631{
632 u8 rec_len = status_len & PCAN_USB_STATUSLEN_DLC;
633 struct sk_buff *skb;
634 struct can_frame *cf;
635 struct skb_shared_hwtstamps *hwts;
636 u32 can_id_flags;
637
638 skb = alloc_can_skb(mc->netdev, &cf);
639 if (!skb)
640 return -ENOMEM;
641
642 if (status_len & PCAN_USB_STATUSLEN_EXT_ID) {
643 if ((mc->ptr + 4) > mc->end)
644 goto decode_failed;
645
646 can_id_flags = get_unaligned_le32(mc->ptr);
647 cf->can_id = can_id_flags >> 3 | CAN_EFF_FLAG;
648 mc->ptr += 4;
649 } else {
650 if ((mc->ptr + 2) > mc->end)
651 goto decode_failed;
652
653 can_id_flags = get_unaligned_le16(mc->ptr);
654 cf->can_id = can_id_flags >> 5;
655 mc->ptr += 2;
656 }
657
658 can_frame_set_cc_len(cf, rec_len, mc->pdev->dev.can.ctrlmode);
659
660 /* Only first packet timestamp is a word */
661 if (pcan_usb_decode_ts(mc, !mc->rec_ts_idx))
662 goto decode_failed;
663
664 /* Next packet in the buffer will have a timestamp on a single byte */
665 mc->rec_ts_idx++;
666
667 /* read data */
668 memset(cf->data, 0x0, sizeof(cf->data));
669 if (status_len & PCAN_USB_STATUSLEN_RTR) {
670 cf->can_id |= CAN_RTR_FLAG;
671 } else {
672 if ((mc->ptr + rec_len) > mc->end)
673 goto decode_failed;
674
675 memcpy(cf->data, mc->ptr, cf->len);
676 mc->ptr += rec_len;
677
678 /* Ignore next byte (client private id) if SRR bit is set */
679 if (can_id_flags & PCAN_USB_TX_SRR)
680 mc->ptr++;
681
682 /* update statistics */
683 mc->netdev->stats.rx_bytes += cf->len;
684 }
685 mc->netdev->stats.rx_packets++;
686
687 /* convert timestamp into kernel time */
688 hwts = skb_hwtstamps(skb);
689 peak_usb_get_ts_time(&mc->pdev->time_ref, mc->ts16, &hwts->hwtstamp);
690
691 /* push the skb */
692 netif_rx(skb);
693
694 return 0;
695
696decode_failed:
697 dev_kfree_skb(skb);
698 return -EINVAL;
699}
700
701/*
702 * process incoming message
703 */
704static int pcan_usb_decode_msg(struct peak_usb_device *dev, u8 *ibuf, u32 lbuf)
705{
706 struct pcan_usb_msg_context mc = {
707 .rec_cnt = ibuf[1],
708 .ptr = ibuf + PCAN_USB_MSG_HEADER_LEN,
709 .end = ibuf + lbuf,
710 .netdev = dev->netdev,
711 .pdev = container_of(dev, struct pcan_usb, dev),
712 };
713 int err;
714
715 for (err = 0; mc.rec_idx < mc.rec_cnt && !err; mc.rec_idx++) {
716 u8 sl = *mc.ptr++;
717
718 /* handle status and error frames here */
719 if (sl & PCAN_USB_STATUSLEN_INTERNAL) {
720 err = pcan_usb_decode_status(&mc, sl);
721 /* handle normal can frames here */
722 } else {
723 err = pcan_usb_decode_data(&mc, sl);
724 }
725 }
726
727 return err;
728}
729
730/*
731 * process any incoming buffer
732 */
733static int pcan_usb_decode_buf(struct peak_usb_device *dev, struct urb *urb)
734{
735 int err = 0;
736
737 if (urb->actual_length > PCAN_USB_MSG_HEADER_LEN) {
738 err = pcan_usb_decode_msg(dev, urb->transfer_buffer,
739 urb->actual_length);
740
741 } else if (urb->actual_length > 0) {
742 netdev_err(dev->netdev, "usb message length error (%u)\n",
743 urb->actual_length);
744 err = -EINVAL;
745 }
746
747 return err;
748}
749
750/*
751 * process outgoing packet
752 */
753static int pcan_usb_encode_msg(struct peak_usb_device *dev, struct sk_buff *skb,
754 u8 *obuf, size_t *size)
755{
756 struct net_device *netdev = dev->netdev;
757 struct net_device_stats *stats = &netdev->stats;
758 struct can_frame *cf = (struct can_frame *)skb->data;
759 u32 can_id_flags = cf->can_id & CAN_ERR_MASK;
760 u8 *pc;
761
762 obuf[0] = PCAN_USB_MSG_TX_CAN;
763 obuf[1] = 1; /* only one CAN frame is stored in the packet */
764
765 pc = obuf + PCAN_USB_MSG_HEADER_LEN;
766
767 /* status/len byte */
768 *pc = can_get_cc_dlc(cf, dev->can.ctrlmode);
769
770 if (cf->can_id & CAN_RTR_FLAG)
771 *pc |= PCAN_USB_STATUSLEN_RTR;
772
773 /* can id */
774 if (cf->can_id & CAN_EFF_FLAG) {
775 *pc |= PCAN_USB_STATUSLEN_EXT_ID;
776 pc++;
777
778 can_id_flags <<= 3;
779
780 if (dev->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
781 can_id_flags |= PCAN_USB_TX_SRR;
782
783 if (dev->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
784 can_id_flags |= PCAN_USB_TX_AT;
785
786 put_unaligned_le32(can_id_flags, pc);
787 pc += 4;
788 } else {
789 pc++;
790
791 can_id_flags <<= 5;
792
793 if (dev->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
794 can_id_flags |= PCAN_USB_TX_SRR;
795
796 if (dev->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT)
797 can_id_flags |= PCAN_USB_TX_AT;
798
799 put_unaligned_le16(can_id_flags, pc);
800 pc += 2;
801 }
802
803 /* can data */
804 if (!(cf->can_id & CAN_RTR_FLAG)) {
805 memcpy(pc, cf->data, cf->len);
806 pc += cf->len;
807 }
808
809 /* SRR bit needs a writer id (useless here) */
810 if (can_id_flags & PCAN_USB_TX_SRR)
811 *pc++ = 0x80;
812
813 obuf[(*size)-1] = (u8)(stats->tx_packets & 0xff);
814
815 return 0;
816}
817
818/* socket callback used to copy berr counters values received through USB */
819static int pcan_usb_get_berr_counter(const struct net_device *netdev,
820 struct can_berr_counter *bec)
821{
822 struct peak_usb_device *dev = netdev_priv(netdev);
823 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
824
825 *bec = pdev->bec;
826
827 /* must return 0 */
828 return 0;
829}
830
831/*
832 * start interface
833 */
834static int pcan_usb_start(struct peak_usb_device *dev)
835{
836 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
837 int err;
838
839 /* number of bits used in timestamps read from adapter struct */
840 peak_usb_init_time_ref(&pdev->time_ref, &pcan_usb);
841
842 pdev->bec.rxerr = 0;
843 pdev->bec.txerr = 0;
844
845 /* always ask the device for BERR reporting, to be able to switch from
846 * WARNING to PASSIVE state
847 */
848 err = pcan_usb_set_err_frame(dev, PCAN_USB_BERR_MASK);
849 if (err)
850 netdev_warn(dev->netdev,
851 "Asking for BERR reporting error %u\n",
852 err);
853
854 /* if revision greater than 3, can put silent mode on/off */
855 if (dev->device_rev > 3) {
856 err = pcan_usb_set_silent(dev,
857 dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
858 if (err)
859 return err;
860 }
861
862 return pcan_usb_set_ext_vcc(dev, 0);
863}
864
865static int pcan_usb_init(struct peak_usb_device *dev)
866{
867 struct pcan_usb *pdev = container_of(dev, struct pcan_usb, dev);
868 u32 serial_number;
869 int err;
870
871 /* initialize a timer needed to wait for hardware restart */
872 timer_setup(&pdev->restart_timer, pcan_usb_restart, 0);
873
874 /*
875 * explicit use of dev_xxx() instead of netdev_xxx() here:
876 * information displayed are related to the device itself, not
877 * to the canx netdevice.
878 */
879 err = pcan_usb_get_serial(dev, &serial_number);
880 if (err) {
881 dev_err(dev->netdev->dev.parent,
882 "unable to read %s serial number (err %d)\n",
883 pcan_usb.name, err);
884 return err;
885 }
886
887 dev_info(dev->netdev->dev.parent,
888 "PEAK-System %s adapter hwrev %u serial %08X (%u channel)\n",
889 pcan_usb.name, dev->device_rev, serial_number,
890 pcan_usb.ctrl_count);
891
892 /* Since rev 4.1, PCAN-USB is able to make single-shot as well as
893 * looped back frames.
894 */
895 if (dev->device_rev >= 41) {
896 struct can_priv *priv = netdev_priv(dev->netdev);
897
898 priv->ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT |
899 CAN_CTRLMODE_LOOPBACK;
900 } else {
901 dev_info(dev->netdev->dev.parent,
902 "Firmware update available. Please contact support@peak-system.com\n");
903 }
904
905 return 0;
906}
907
908/*
909 * probe function for new PCAN-USB usb interface
910 */
911static int pcan_usb_probe(struct usb_interface *intf)
912{
913 struct usb_host_interface *if_desc;
914 int i;
915
916 if_desc = intf->altsetting;
917
918 /* check interface endpoint addresses */
919 for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
920 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
921
922 switch (ep->bEndpointAddress) {
923 case PCAN_USB_EP_CMDOUT:
924 case PCAN_USB_EP_CMDIN:
925 case PCAN_USB_EP_MSGOUT:
926 case PCAN_USB_EP_MSGIN:
927 break;
928 default:
929 return -ENODEV;
930 }
931 }
932
933 return 0;
934}
935
936static int pcan_usb_set_phys_id(struct net_device *netdev,
937 enum ethtool_phys_id_state state)
938{
939 struct peak_usb_device *dev = netdev_priv(netdev);
940 int err = 0;
941
942 switch (state) {
943 case ETHTOOL_ID_ACTIVE:
944 /* call ON/OFF twice a second */
945 return 2;
946
947 case ETHTOOL_ID_OFF:
948 err = pcan_usb_set_led(dev, 0);
949 break;
950
951 case ETHTOOL_ID_ON:
952 fallthrough;
953
954 case ETHTOOL_ID_INACTIVE:
955 /* restore LED default */
956 err = pcan_usb_set_led(dev, 1);
957 break;
958
959 default:
960 break;
961 }
962
963 return err;
964}
965
966static const struct ethtool_ops pcan_usb_ethtool_ops = {
967 .set_phys_id = pcan_usb_set_phys_id,
968 .get_ts_info = pcan_get_ts_info,
969};
970
971/*
972 * describe the PCAN-USB adapter
973 */
974static const struct can_bittiming_const pcan_usb_const = {
975 .name = "pcan_usb",
976 .tseg1_min = 1,
977 .tseg1_max = 16,
978 .tseg2_min = 1,
979 .tseg2_max = 8,
980 .sjw_max = 4,
981 .brp_min = 1,
982 .brp_max = 64,
983 .brp_inc = 1,
984};
985
986const struct peak_usb_adapter pcan_usb = {
987 .name = "PCAN-USB",
988 .device_id = PCAN_USB_PRODUCT_ID,
989 .ctrl_count = 1,
990 .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY |
991 CAN_CTRLMODE_CC_LEN8_DLC,
992 .clock = {
993 .freq = PCAN_USB_CRYSTAL_HZ / 2,
994 },
995 .bittiming_const = &pcan_usb_const,
996
997 /* size of device private data */
998 .sizeof_dev_private = sizeof(struct pcan_usb),
999
1000 .ethtool_ops = &pcan_usb_ethtool_ops,
1001
1002 /* timestamps usage */
1003 .ts_used_bits = 16,
1004 .us_per_ts_scale = PCAN_USB_TS_US_PER_TICK, /* us=(ts*scale) */
1005 .us_per_ts_shift = PCAN_USB_TS_DIV_SHIFTER, /* >> shift */
1006
1007 /* give here messages in/out endpoints */
1008 .ep_msg_in = PCAN_USB_EP_MSGIN,
1009 .ep_msg_out = {PCAN_USB_EP_MSGOUT},
1010
1011 /* size of rx/tx usb buffers */
1012 .rx_buffer_size = PCAN_USB_RX_BUFFER_SIZE,
1013 .tx_buffer_size = PCAN_USB_TX_BUFFER_SIZE,
1014
1015 /* device callbacks */
1016 .intf_probe = pcan_usb_probe,
1017 .dev_init = pcan_usb_init,
1018 .dev_set_bus = pcan_usb_write_mode,
1019 .dev_set_bittiming = pcan_usb_set_bittiming,
1020 .dev_get_device_id = pcan_usb_get_device_id,
1021 .dev_decode_buf = pcan_usb_decode_buf,
1022 .dev_encode_msg = pcan_usb_encode_msg,
1023 .dev_start = pcan_usb_start,
1024 .dev_restart_async = pcan_usb_restart_async,
1025 .do_get_berr_counter = pcan_usb_get_berr_counter,
1026};