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7
8
9#include <asm/unaligned.h>
10#include <linux/can.h>
11#include <linux/can/dev.h>
12#include <linux/can/error.h>
13#include <linux/can/led.h>
14#include <linux/module.h>
15#include <linux/netdevice.h>
16#include <linux/signal.h>
17#include <linux/slab.h>
18#include <linux/usb.h>
19
20
21#define MCBA_MODULE_NAME "mcba_usb"
22#define MCBA_VENDOR_ID 0x04d8
23#define MCBA_PRODUCT_ID 0x0a30
24
25
26#define MCBA_MAX_RX_URBS 20
27#define MCBA_MAX_TX_URBS 20
28#define MCBA_CTX_FREE MCBA_MAX_TX_URBS
29
30
31
32
33#define MCBA_USB_RX_BUFF_SIZE 64
34#define MCBA_USB_TX_BUFF_SIZE (sizeof(struct mcba_usb_msg))
35
36
37#define MCBA_USB_EP_IN 1
38#define MCBA_USB_EP_OUT 1
39
40
41#define MBCA_CMD_RECEIVE_MESSAGE 0xE3
42#define MBCA_CMD_I_AM_ALIVE_FROM_CAN 0xF5
43#define MBCA_CMD_I_AM_ALIVE_FROM_USB 0xF7
44#define MBCA_CMD_CHANGE_BIT_RATE 0xA1
45#define MBCA_CMD_TRANSMIT_MESSAGE_EV 0xA3
46#define MBCA_CMD_SETUP_TERMINATION_RESISTANCE 0xA8
47#define MBCA_CMD_READ_FW_VERSION 0xA9
48#define MBCA_CMD_NOTHING_TO_SEND 0xFF
49#define MBCA_CMD_TRANSMIT_MESSAGE_RSP 0xE2
50
51#define MCBA_VER_REQ_USB 1
52#define MCBA_VER_REQ_CAN 2
53
54#define MCBA_SIDL_EXID_MASK 0x8
55#define MCBA_DLC_MASK 0xf
56#define MCBA_DLC_RTR_MASK 0x40
57
58#define MCBA_CAN_STATE_WRN_TH 95
59#define MCBA_CAN_STATE_ERR_PSV_TH 127
60
61#define MCBA_TERMINATION_DISABLED CAN_TERMINATION_DISABLED
62#define MCBA_TERMINATION_ENABLED 120
63
64struct mcba_usb_ctx {
65 struct mcba_priv *priv;
66 u32 ndx;
67 u8 dlc;
68 bool can;
69};
70
71
72struct mcba_priv {
73 struct can_priv can;
74 struct sk_buff *echo_skb[MCBA_MAX_TX_URBS];
75 struct mcba_usb_ctx tx_context[MCBA_MAX_TX_URBS];
76 struct usb_device *udev;
77 struct net_device *netdev;
78 struct usb_anchor tx_submitted;
79 struct usb_anchor rx_submitted;
80 struct can_berr_counter bec;
81 bool usb_ka_first_pass;
82 bool can_ka_first_pass;
83 bool can_speed_check;
84 atomic_t free_ctx_cnt;
85};
86
87
88struct __packed mcba_usb_msg_can {
89 u8 cmd_id;
90 __be16 eid;
91 __be16 sid;
92 u8 dlc;
93 u8 data[8];
94 u8 timestamp[4];
95 u8 checksum;
96};
97
98
99struct __packed mcba_usb_msg {
100 u8 cmd_id;
101 u8 unused[18];
102};
103
104struct __packed mcba_usb_msg_ka_usb {
105 u8 cmd_id;
106 u8 termination_state;
107 u8 soft_ver_major;
108 u8 soft_ver_minor;
109 u8 unused[15];
110};
111
112struct __packed mcba_usb_msg_ka_can {
113 u8 cmd_id;
114 u8 tx_err_cnt;
115 u8 rx_err_cnt;
116 u8 rx_buff_ovfl;
117 u8 tx_bus_off;
118 __be16 can_bitrate;
119 __le16 rx_lost;
120 u8 can_stat;
121 u8 soft_ver_major;
122 u8 soft_ver_minor;
123 u8 debug_mode;
124 u8 test_complete;
125 u8 test_result;
126 u8 unused[4];
127};
128
129struct __packed mcba_usb_msg_change_bitrate {
130 u8 cmd_id;
131 __be16 bitrate;
132 u8 unused[16];
133};
134
135struct __packed mcba_usb_msg_termination {
136 u8 cmd_id;
137 u8 termination;
138 u8 unused[17];
139};
140
141struct __packed mcba_usb_msg_fw_ver {
142 u8 cmd_id;
143 u8 pic;
144 u8 unused[17];
145};
146
147static const struct usb_device_id mcba_usb_table[] = {
148 { USB_DEVICE(MCBA_VENDOR_ID, MCBA_PRODUCT_ID) },
149 {}
150};
151
152MODULE_DEVICE_TABLE(usb, mcba_usb_table);
153
154static const u16 mcba_termination[] = { MCBA_TERMINATION_DISABLED,
155 MCBA_TERMINATION_ENABLED };
156
157static const u32 mcba_bitrate[] = { 20000, 33333, 50000, 80000, 83333,
158 100000, 125000, 150000, 175000, 200000,
159 225000, 250000, 275000, 300000, 500000,
160 625000, 800000, 1000000 };
161
162static inline void mcba_init_ctx(struct mcba_priv *priv)
163{
164 int i = 0;
165
166 for (i = 0; i < MCBA_MAX_TX_URBS; i++) {
167 priv->tx_context[i].ndx = MCBA_CTX_FREE;
168 priv->tx_context[i].priv = priv;
169 }
170
171 atomic_set(&priv->free_ctx_cnt, ARRAY_SIZE(priv->tx_context));
172}
173
174static inline struct mcba_usb_ctx *mcba_usb_get_free_ctx(struct mcba_priv *priv,
175 struct can_frame *cf)
176{
177 int i = 0;
178 struct mcba_usb_ctx *ctx = NULL;
179
180 for (i = 0; i < MCBA_MAX_TX_URBS; i++) {
181 if (priv->tx_context[i].ndx == MCBA_CTX_FREE) {
182 ctx = &priv->tx_context[i];
183 ctx->ndx = i;
184
185 if (cf) {
186 ctx->can = true;
187 ctx->dlc = cf->can_dlc;
188 } else {
189 ctx->can = false;
190 ctx->dlc = 0;
191 }
192
193 atomic_dec(&priv->free_ctx_cnt);
194 break;
195 }
196 }
197
198 if (!atomic_read(&priv->free_ctx_cnt))
199
200 netif_stop_queue(priv->netdev);
201
202 return ctx;
203}
204
205
206
207
208static inline void mcba_usb_free_ctx(struct mcba_usb_ctx *ctx)
209{
210
211 atomic_inc(&ctx->priv->free_ctx_cnt);
212
213 ctx->ndx = MCBA_CTX_FREE;
214
215
216 netif_wake_queue(ctx->priv->netdev);
217}
218
219static void mcba_usb_write_bulk_callback(struct urb *urb)
220{
221 struct mcba_usb_ctx *ctx = urb->context;
222 struct net_device *netdev;
223
224 WARN_ON(!ctx);
225
226 netdev = ctx->priv->netdev;
227
228
229 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
230 urb->transfer_buffer, urb->transfer_dma);
231
232 if (ctx->can) {
233 if (!netif_device_present(netdev))
234 return;
235
236 netdev->stats.tx_packets++;
237 netdev->stats.tx_bytes += ctx->dlc;
238
239 can_led_event(netdev, CAN_LED_EVENT_TX);
240 can_get_echo_skb(netdev, ctx->ndx);
241 }
242
243 if (urb->status)
244 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
245
246
247 mcba_usb_free_ctx(ctx);
248}
249
250
251static netdev_tx_t mcba_usb_xmit(struct mcba_priv *priv,
252 struct mcba_usb_msg *usb_msg,
253 struct mcba_usb_ctx *ctx)
254{
255 struct urb *urb;
256 u8 *buf;
257 int err;
258
259
260 urb = usb_alloc_urb(0, GFP_ATOMIC);
261 if (!urb)
262 return -ENOMEM;
263
264 buf = usb_alloc_coherent(priv->udev, MCBA_USB_TX_BUFF_SIZE, GFP_ATOMIC,
265 &urb->transfer_dma);
266 if (!buf) {
267 err = -ENOMEM;
268 goto nomembuf;
269 }
270
271 memcpy(buf, usb_msg, MCBA_USB_TX_BUFF_SIZE);
272
273 usb_fill_bulk_urb(urb, priv->udev,
274 usb_sndbulkpipe(priv->udev, MCBA_USB_EP_OUT), buf,
275 MCBA_USB_TX_BUFF_SIZE, mcba_usb_write_bulk_callback,
276 ctx);
277
278 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
279 usb_anchor_urb(urb, &priv->tx_submitted);
280
281 err = usb_submit_urb(urb, GFP_ATOMIC);
282 if (unlikely(err))
283 goto failed;
284
285
286
287
288 usb_free_urb(urb);
289
290 return 0;
291
292failed:
293 usb_unanchor_urb(urb);
294 usb_free_coherent(priv->udev, MCBA_USB_TX_BUFF_SIZE, buf,
295 urb->transfer_dma);
296
297 if (err == -ENODEV)
298 netif_device_detach(priv->netdev);
299 else
300 netdev_warn(priv->netdev, "failed tx_urb %d\n", err);
301
302nomembuf:
303 usb_free_urb(urb);
304
305 return err;
306}
307
308
309static netdev_tx_t mcba_usb_start_xmit(struct sk_buff *skb,
310 struct net_device *netdev)
311{
312 struct mcba_priv *priv = netdev_priv(netdev);
313 struct can_frame *cf = (struct can_frame *)skb->data;
314 struct mcba_usb_ctx *ctx = NULL;
315 struct net_device_stats *stats = &priv->netdev->stats;
316 u16 sid;
317 int err;
318 struct mcba_usb_msg_can usb_msg = {
319 .cmd_id = MBCA_CMD_TRANSMIT_MESSAGE_EV
320 };
321
322 if (can_dropped_invalid_skb(netdev, skb))
323 return NETDEV_TX_OK;
324
325 ctx = mcba_usb_get_free_ctx(priv, cf);
326 if (!ctx)
327 return NETDEV_TX_BUSY;
328
329 can_put_echo_skb(skb, priv->netdev, ctx->ndx);
330
331 if (cf->can_id & CAN_EFF_FLAG) {
332
333
334
335 sid = MCBA_SIDL_EXID_MASK;
336
337 sid |= (cf->can_id & 0x1ffc0000) >> 13;
338
339 sid |= (cf->can_id & 0x30000) >> 16;
340 put_unaligned_be16(sid, &usb_msg.sid);
341
342
343 put_unaligned_be16(cf->can_id & 0xffff, &usb_msg.eid);
344 } else {
345
346
347
348 put_unaligned_be16((cf->can_id & CAN_SFF_MASK) << 5,
349 &usb_msg.sid);
350 usb_msg.eid = 0;
351 }
352
353 usb_msg.dlc = cf->can_dlc;
354
355 memcpy(usb_msg.data, cf->data, usb_msg.dlc);
356
357 if (cf->can_id & CAN_RTR_FLAG)
358 usb_msg.dlc |= MCBA_DLC_RTR_MASK;
359
360 err = mcba_usb_xmit(priv, (struct mcba_usb_msg *)&usb_msg, ctx);
361 if (err)
362 goto xmit_failed;
363
364 return NETDEV_TX_OK;
365
366xmit_failed:
367 can_free_echo_skb(priv->netdev, ctx->ndx);
368 mcba_usb_free_ctx(ctx);
369 dev_kfree_skb(skb);
370 stats->tx_dropped++;
371
372 return NETDEV_TX_OK;
373}
374
375
376static void mcba_usb_xmit_cmd(struct mcba_priv *priv,
377 struct mcba_usb_msg *usb_msg)
378{
379 struct mcba_usb_ctx *ctx = NULL;
380 int err;
381
382 ctx = mcba_usb_get_free_ctx(priv, NULL);
383 if (!ctx) {
384 netdev_err(priv->netdev,
385 "Lack of free ctx. Sending (%d) cmd aborted",
386 usb_msg->cmd_id);
387
388 return;
389 }
390
391 err = mcba_usb_xmit(priv, usb_msg, ctx);
392 if (err)
393 netdev_err(priv->netdev, "Failed to send cmd (%d)",
394 usb_msg->cmd_id);
395}
396
397static void mcba_usb_xmit_change_bitrate(struct mcba_priv *priv, u16 bitrate)
398{
399 struct mcba_usb_msg_change_bitrate usb_msg = {
400 .cmd_id = MBCA_CMD_CHANGE_BIT_RATE
401 };
402
403 put_unaligned_be16(bitrate, &usb_msg.bitrate);
404
405 mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
406}
407
408static void mcba_usb_xmit_read_fw_ver(struct mcba_priv *priv, u8 pic)
409{
410 struct mcba_usb_msg_fw_ver usb_msg = {
411 .cmd_id = MBCA_CMD_READ_FW_VERSION,
412 .pic = pic
413 };
414
415 mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
416}
417
418static void mcba_usb_process_can(struct mcba_priv *priv,
419 struct mcba_usb_msg_can *msg)
420{
421 struct can_frame *cf;
422 struct sk_buff *skb;
423 struct net_device_stats *stats = &priv->netdev->stats;
424 u16 sid;
425
426 skb = alloc_can_skb(priv->netdev, &cf);
427 if (!skb)
428 return;
429
430 sid = get_unaligned_be16(&msg->sid);
431
432 if (sid & MCBA_SIDL_EXID_MASK) {
433
434
435
436 cf->can_id = CAN_EFF_FLAG;
437
438
439 cf->can_id |= (sid & 0xffe0) << 13;
440
441 cf->can_id |= (sid & 3) << 16;
442
443 cf->can_id |= get_unaligned_be16(&msg->eid);
444 } else {
445
446
447
448 cf->can_id = (sid & 0xffe0) >> 5;
449 }
450
451 if (msg->dlc & MCBA_DLC_RTR_MASK)
452 cf->can_id |= CAN_RTR_FLAG;
453
454 cf->can_dlc = get_can_dlc(msg->dlc & MCBA_DLC_MASK);
455
456 memcpy(cf->data, msg->data, cf->can_dlc);
457
458 stats->rx_packets++;
459 stats->rx_bytes += cf->can_dlc;
460
461 can_led_event(priv->netdev, CAN_LED_EVENT_RX);
462 netif_rx(skb);
463}
464
465static void mcba_usb_process_ka_usb(struct mcba_priv *priv,
466 struct mcba_usb_msg_ka_usb *msg)
467{
468 if (unlikely(priv->usb_ka_first_pass)) {
469 netdev_info(priv->netdev, "PIC USB version %hhu.%hhu\n",
470 msg->soft_ver_major, msg->soft_ver_minor);
471
472 priv->usb_ka_first_pass = false;
473 }
474
475 if (msg->termination_state)
476 priv->can.termination = MCBA_TERMINATION_ENABLED;
477 else
478 priv->can.termination = MCBA_TERMINATION_DISABLED;
479}
480
481static u32 convert_can2host_bitrate(struct mcba_usb_msg_ka_can *msg)
482{
483 const u32 bitrate = get_unaligned_be16(&msg->can_bitrate);
484
485 if ((bitrate == 33) || (bitrate == 83))
486 return bitrate * 1000 + 333;
487 else
488 return bitrate * 1000;
489}
490
491static void mcba_usb_process_ka_can(struct mcba_priv *priv,
492 struct mcba_usb_msg_ka_can *msg)
493{
494 if (unlikely(priv->can_ka_first_pass)) {
495 netdev_info(priv->netdev, "PIC CAN version %hhu.%hhu\n",
496 msg->soft_ver_major, msg->soft_ver_minor);
497
498 priv->can_ka_first_pass = false;
499 }
500
501 if (unlikely(priv->can_speed_check)) {
502 const u32 bitrate = convert_can2host_bitrate(msg);
503
504 priv->can_speed_check = false;
505
506 if (bitrate != priv->can.bittiming.bitrate)
507 netdev_err(
508 priv->netdev,
509 "Wrong bitrate reported by the device (%u). Expected %u",
510 bitrate, priv->can.bittiming.bitrate);
511 }
512
513 priv->bec.txerr = msg->tx_err_cnt;
514 priv->bec.rxerr = msg->rx_err_cnt;
515
516 if (msg->tx_bus_off)
517 priv->can.state = CAN_STATE_BUS_OFF;
518
519 else if ((priv->bec.txerr > MCBA_CAN_STATE_ERR_PSV_TH) ||
520 (priv->bec.rxerr > MCBA_CAN_STATE_ERR_PSV_TH))
521 priv->can.state = CAN_STATE_ERROR_PASSIVE;
522
523 else if ((priv->bec.txerr > MCBA_CAN_STATE_WRN_TH) ||
524 (priv->bec.rxerr > MCBA_CAN_STATE_WRN_TH))
525 priv->can.state = CAN_STATE_ERROR_WARNING;
526}
527
528static void mcba_usb_process_rx(struct mcba_priv *priv,
529 struct mcba_usb_msg *msg)
530{
531 switch (msg->cmd_id) {
532 case MBCA_CMD_I_AM_ALIVE_FROM_CAN:
533 mcba_usb_process_ka_can(priv,
534 (struct mcba_usb_msg_ka_can *)msg);
535 break;
536
537 case MBCA_CMD_I_AM_ALIVE_FROM_USB:
538 mcba_usb_process_ka_usb(priv,
539 (struct mcba_usb_msg_ka_usb *)msg);
540 break;
541
542 case MBCA_CMD_RECEIVE_MESSAGE:
543 mcba_usb_process_can(priv, (struct mcba_usb_msg_can *)msg);
544 break;
545
546 case MBCA_CMD_NOTHING_TO_SEND:
547
548
549
550 break;
551
552 case MBCA_CMD_TRANSMIT_MESSAGE_RSP:
553
554 break;
555
556 default:
557 netdev_warn(priv->netdev, "Unsupported msg (0x%hhX)",
558 msg->cmd_id);
559 break;
560 }
561}
562
563
564
565
566
567static void mcba_usb_read_bulk_callback(struct urb *urb)
568{
569 struct mcba_priv *priv = urb->context;
570 struct net_device *netdev;
571 int retval;
572 int pos = 0;
573
574 netdev = priv->netdev;
575
576 if (!netif_device_present(netdev))
577 return;
578
579 switch (urb->status) {
580 case 0:
581 break;
582
583 case -ENOENT:
584 case -EPIPE:
585 case -EPROTO:
586 case -ESHUTDOWN:
587 return;
588
589 default:
590 netdev_info(netdev, "Rx URB aborted (%d)\n", urb->status);
591
592 goto resubmit_urb;
593 }
594
595 while (pos < urb->actual_length) {
596 struct mcba_usb_msg *msg;
597
598 if (pos + sizeof(struct mcba_usb_msg) > urb->actual_length) {
599 netdev_err(priv->netdev, "format error\n");
600 break;
601 }
602
603 msg = (struct mcba_usb_msg *)(urb->transfer_buffer + pos);
604 mcba_usb_process_rx(priv, msg);
605
606 pos += sizeof(struct mcba_usb_msg);
607 }
608
609resubmit_urb:
610
611 usb_fill_bulk_urb(urb, priv->udev,
612 usb_rcvbulkpipe(priv->udev, MCBA_USB_EP_OUT),
613 urb->transfer_buffer, MCBA_USB_RX_BUFF_SIZE,
614 mcba_usb_read_bulk_callback, priv);
615
616 retval = usb_submit_urb(urb, GFP_ATOMIC);
617
618 if (retval == -ENODEV)
619 netif_device_detach(netdev);
620 else if (retval)
621 netdev_err(netdev, "failed resubmitting read bulk urb: %d\n",
622 retval);
623}
624
625
626static int mcba_usb_start(struct mcba_priv *priv)
627{
628 struct net_device *netdev = priv->netdev;
629 int err, i;
630
631 mcba_init_ctx(priv);
632
633 for (i = 0; i < MCBA_MAX_RX_URBS; i++) {
634 struct urb *urb = NULL;
635 u8 *buf;
636
637
638 urb = usb_alloc_urb(0, GFP_KERNEL);
639 if (!urb) {
640 err = -ENOMEM;
641 break;
642 }
643
644 buf = usb_alloc_coherent(priv->udev, MCBA_USB_RX_BUFF_SIZE,
645 GFP_KERNEL, &urb->transfer_dma);
646 if (!buf) {
647 netdev_err(netdev, "No memory left for USB buffer\n");
648 usb_free_urb(urb);
649 err = -ENOMEM;
650 break;
651 }
652
653 usb_fill_bulk_urb(urb, priv->udev,
654 usb_rcvbulkpipe(priv->udev, MCBA_USB_EP_IN),
655 buf, MCBA_USB_RX_BUFF_SIZE,
656 mcba_usb_read_bulk_callback, priv);
657 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
658 usb_anchor_urb(urb, &priv->rx_submitted);
659
660 err = usb_submit_urb(urb, GFP_KERNEL);
661 if (err) {
662 usb_unanchor_urb(urb);
663 usb_free_coherent(priv->udev, MCBA_USB_RX_BUFF_SIZE,
664 buf, urb->transfer_dma);
665 usb_free_urb(urb);
666 break;
667 }
668
669
670 usb_free_urb(urb);
671 }
672
673
674 if (i == 0) {
675 netdev_warn(netdev, "couldn't setup read URBs\n");
676 return err;
677 }
678
679
680 if (i < MCBA_MAX_RX_URBS)
681 netdev_warn(netdev, "rx performance may be slow\n");
682
683 mcba_usb_xmit_read_fw_ver(priv, MCBA_VER_REQ_USB);
684 mcba_usb_xmit_read_fw_ver(priv, MCBA_VER_REQ_CAN);
685
686 return err;
687}
688
689
690static int mcba_usb_open(struct net_device *netdev)
691{
692 struct mcba_priv *priv = netdev_priv(netdev);
693 int err;
694
695
696 err = open_candev(netdev);
697 if (err)
698 return err;
699
700 priv->can_speed_check = true;
701 priv->can.state = CAN_STATE_ERROR_ACTIVE;
702
703 can_led_event(netdev, CAN_LED_EVENT_OPEN);
704 netif_start_queue(netdev);
705
706 return 0;
707}
708
709static void mcba_urb_unlink(struct mcba_priv *priv)
710{
711 usb_kill_anchored_urbs(&priv->rx_submitted);
712 usb_kill_anchored_urbs(&priv->tx_submitted);
713}
714
715
716static int mcba_usb_close(struct net_device *netdev)
717{
718 struct mcba_priv *priv = netdev_priv(netdev);
719
720 priv->can.state = CAN_STATE_STOPPED;
721
722 netif_stop_queue(netdev);
723
724
725 mcba_urb_unlink(priv);
726
727 close_candev(netdev);
728 can_led_event(netdev, CAN_LED_EVENT_STOP);
729
730 return 0;
731}
732
733
734
735
736
737
738static int mcba_net_set_mode(struct net_device *netdev, enum can_mode mode)
739{
740 return 0;
741}
742
743static int mcba_net_get_berr_counter(const struct net_device *netdev,
744 struct can_berr_counter *bec)
745{
746 struct mcba_priv *priv = netdev_priv(netdev);
747
748 bec->txerr = priv->bec.txerr;
749 bec->rxerr = priv->bec.rxerr;
750
751 return 0;
752}
753
754static const struct net_device_ops mcba_netdev_ops = {
755 .ndo_open = mcba_usb_open,
756 .ndo_stop = mcba_usb_close,
757 .ndo_start_xmit = mcba_usb_start_xmit,
758};
759
760
761
762
763
764static int mcba_net_set_bittiming(struct net_device *netdev)
765{
766 struct mcba_priv *priv = netdev_priv(netdev);
767 const u16 bitrate_kbps = priv->can.bittiming.bitrate / 1000;
768
769 mcba_usb_xmit_change_bitrate(priv, bitrate_kbps);
770
771 return 0;
772}
773
774static int mcba_set_termination(struct net_device *netdev, u16 term)
775{
776 struct mcba_priv *priv = netdev_priv(netdev);
777 struct mcba_usb_msg_termination usb_msg = {
778 .cmd_id = MBCA_CMD_SETUP_TERMINATION_RESISTANCE
779 };
780
781 if (term == MCBA_TERMINATION_ENABLED)
782 usb_msg.termination = 1;
783 else
784 usb_msg.termination = 0;
785
786 mcba_usb_xmit_cmd(priv, (struct mcba_usb_msg *)&usb_msg);
787
788 return 0;
789}
790
791static int mcba_usb_probe(struct usb_interface *intf,
792 const struct usb_device_id *id)
793{
794 struct net_device *netdev;
795 struct mcba_priv *priv;
796 int err = -ENOMEM;
797 struct usb_device *usbdev = interface_to_usbdev(intf);
798
799 netdev = alloc_candev(sizeof(struct mcba_priv), MCBA_MAX_TX_URBS);
800 if (!netdev) {
801 dev_err(&intf->dev, "Couldn't alloc candev\n");
802 return -ENOMEM;
803 }
804
805 priv = netdev_priv(netdev);
806
807 priv->udev = usbdev;
808 priv->netdev = netdev;
809 priv->usb_ka_first_pass = true;
810 priv->can_ka_first_pass = true;
811 priv->can_speed_check = false;
812
813 init_usb_anchor(&priv->rx_submitted);
814 init_usb_anchor(&priv->tx_submitted);
815
816 usb_set_intfdata(intf, priv);
817
818
819 priv->can.state = CAN_STATE_STOPPED;
820 priv->can.termination_const = mcba_termination;
821 priv->can.termination_const_cnt = ARRAY_SIZE(mcba_termination);
822 priv->can.bitrate_const = mcba_bitrate;
823 priv->can.bitrate_const_cnt = ARRAY_SIZE(mcba_bitrate);
824
825 priv->can.do_set_termination = mcba_set_termination;
826 priv->can.do_set_mode = mcba_net_set_mode;
827 priv->can.do_get_berr_counter = mcba_net_get_berr_counter;
828 priv->can.do_set_bittiming = mcba_net_set_bittiming;
829
830 netdev->netdev_ops = &mcba_netdev_ops;
831
832 netdev->flags |= IFF_ECHO;
833
834 SET_NETDEV_DEV(netdev, &intf->dev);
835
836 err = register_candev(netdev);
837 if (err) {
838 netdev_err(netdev, "couldn't register CAN device: %d\n", err);
839
840 goto cleanup_free_candev;
841 }
842
843 devm_can_led_init(netdev);
844
845
846 err = mcba_usb_start(priv);
847 if (err) {
848 if (err == -ENODEV)
849 netif_device_detach(priv->netdev);
850
851 netdev_warn(netdev, "couldn't start device: %d\n", err);
852
853 goto cleanup_unregister_candev;
854 }
855
856 dev_info(&intf->dev, "Microchip CAN BUS Analyzer connected\n");
857
858 return 0;
859
860cleanup_unregister_candev:
861 unregister_candev(priv->netdev);
862
863cleanup_free_candev:
864 free_candev(netdev);
865
866 return err;
867}
868
869
870static void mcba_usb_disconnect(struct usb_interface *intf)
871{
872 struct mcba_priv *priv = usb_get_intfdata(intf);
873
874 usb_set_intfdata(intf, NULL);
875
876 netdev_info(priv->netdev, "device disconnected\n");
877
878 unregister_candev(priv->netdev);
879 mcba_urb_unlink(priv);
880 free_candev(priv->netdev);
881}
882
883static struct usb_driver mcba_usb_driver = {
884 .name = MCBA_MODULE_NAME,
885 .probe = mcba_usb_probe,
886 .disconnect = mcba_usb_disconnect,
887 .id_table = mcba_usb_table,
888};
889
890module_usb_driver(mcba_usb_driver);
891
892MODULE_AUTHOR("Remigiusz Kołłątaj <remigiusz.kollataj@mobica.com>");
893MODULE_DESCRIPTION("SocketCAN driver for Microchip CAN BUS Analyzer Tool");
894MODULE_LICENSE("GPL v2");
895
