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[deliverable/linux.git] / drivers / net / can / usb / kvaser_usb.c
1 /*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License as
4 * published by the Free Software Foundation version 2.
5 *
6 * Parts of this driver are based on the following:
7 * - Kvaser linux leaf driver (version 4.78)
8 * - CAN driver for esd CAN-USB/2
9 *
10 * Copyright (C) 2002-2006 KVASER AB, Sweden. All rights reserved.
11 * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
12 * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
13 */
14
15 #include <linux/completion.h>
16 #include <linux/module.h>
17 #include <linux/netdevice.h>
18 #include <linux/usb.h>
19
20 #include <linux/can.h>
21 #include <linux/can/dev.h>
22 #include <linux/can/error.h>
23
24 #define MAX_TX_URBS 16
25 #define MAX_RX_URBS 4
26 #define START_TIMEOUT 1000 /* msecs */
27 #define STOP_TIMEOUT 1000 /* msecs */
28 #define USB_SEND_TIMEOUT 1000 /* msecs */
29 #define USB_RECV_TIMEOUT 1000 /* msecs */
30 #define RX_BUFFER_SIZE 3072
31 #define CAN_USB_CLOCK 8000000
32 #define MAX_NET_DEVICES 3
33
34 /* Kvaser USB devices */
35 #define KVASER_VENDOR_ID 0x0bfd
36 #define USB_LEAF_DEVEL_PRODUCT_ID 10
37 #define USB_LEAF_LITE_PRODUCT_ID 11
38 #define USB_LEAF_PRO_PRODUCT_ID 12
39 #define USB_LEAF_SPRO_PRODUCT_ID 14
40 #define USB_LEAF_PRO_LS_PRODUCT_ID 15
41 #define USB_LEAF_PRO_SWC_PRODUCT_ID 16
42 #define USB_LEAF_PRO_LIN_PRODUCT_ID 17
43 #define USB_LEAF_SPRO_LS_PRODUCT_ID 18
44 #define USB_LEAF_SPRO_SWC_PRODUCT_ID 19
45 #define USB_MEMO2_DEVEL_PRODUCT_ID 22
46 #define USB_MEMO2_HSHS_PRODUCT_ID 23
47 #define USB_UPRO_HSHS_PRODUCT_ID 24
48 #define USB_LEAF_LITE_GI_PRODUCT_ID 25
49 #define USB_LEAF_PRO_OBDII_PRODUCT_ID 26
50 #define USB_MEMO2_HSLS_PRODUCT_ID 27
51 #define USB_LEAF_LITE_CH_PRODUCT_ID 28
52 #define USB_BLACKBIRD_SPRO_PRODUCT_ID 29
53 #define USB_OEM_MERCURY_PRODUCT_ID 34
54 #define USB_OEM_LEAF_PRODUCT_ID 35
55 #define USB_CAN_R_PRODUCT_ID 39
56 #define USB_LEAF_LITE_V2_PRODUCT_ID 288
57 #define USB_MINI_PCIE_HS_PRODUCT_ID 289
58
59 /* USB devices features */
60 #define KVASER_HAS_SILENT_MODE BIT(0)
61 #define KVASER_HAS_TXRX_ERRORS BIT(1)
62
63 /* Message header size */
64 #define MSG_HEADER_LEN 2
65
66 /* Can message flags */
67 #define MSG_FLAG_ERROR_FRAME BIT(0)
68 #define MSG_FLAG_OVERRUN BIT(1)
69 #define MSG_FLAG_NERR BIT(2)
70 #define MSG_FLAG_WAKEUP BIT(3)
71 #define MSG_FLAG_REMOTE_FRAME BIT(4)
72 #define MSG_FLAG_RESERVED BIT(5)
73 #define MSG_FLAG_TX_ACK BIT(6)
74 #define MSG_FLAG_TX_REQUEST BIT(7)
75
76 /* Can states */
77 #define M16C_STATE_BUS_RESET BIT(0)
78 #define M16C_STATE_BUS_ERROR BIT(4)
79 #define M16C_STATE_BUS_PASSIVE BIT(5)
80 #define M16C_STATE_BUS_OFF BIT(6)
81
82 /* Can msg ids */
83 #define CMD_RX_STD_MESSAGE 12
84 #define CMD_TX_STD_MESSAGE 13
85 #define CMD_RX_EXT_MESSAGE 14
86 #define CMD_TX_EXT_MESSAGE 15
87 #define CMD_SET_BUS_PARAMS 16
88 #define CMD_GET_BUS_PARAMS 17
89 #define CMD_GET_BUS_PARAMS_REPLY 18
90 #define CMD_GET_CHIP_STATE 19
91 #define CMD_CHIP_STATE_EVENT 20
92 #define CMD_SET_CTRL_MODE 21
93 #define CMD_GET_CTRL_MODE 22
94 #define CMD_GET_CTRL_MODE_REPLY 23
95 #define CMD_RESET_CHIP 24
96 #define CMD_RESET_CARD 25
97 #define CMD_START_CHIP 26
98 #define CMD_START_CHIP_REPLY 27
99 #define CMD_STOP_CHIP 28
100 #define CMD_STOP_CHIP_REPLY 29
101 #define CMD_GET_CARD_INFO2 32
102 #define CMD_GET_CARD_INFO 34
103 #define CMD_GET_CARD_INFO_REPLY 35
104 #define CMD_GET_SOFTWARE_INFO 38
105 #define CMD_GET_SOFTWARE_INFO_REPLY 39
106 #define CMD_ERROR_EVENT 45
107 #define CMD_FLUSH_QUEUE 48
108 #define CMD_RESET_ERROR_COUNTER 49
109 #define CMD_TX_ACKNOWLEDGE 50
110 #define CMD_CAN_ERROR_EVENT 51
111 #define CMD_USB_THROTTLE 77
112 #define CMD_LOG_MESSAGE 106
113
114 /* error factors */
115 #define M16C_EF_ACKE BIT(0)
116 #define M16C_EF_CRCE BIT(1)
117 #define M16C_EF_FORME BIT(2)
118 #define M16C_EF_STFE BIT(3)
119 #define M16C_EF_BITE0 BIT(4)
120 #define M16C_EF_BITE1 BIT(5)
121 #define M16C_EF_RCVE BIT(6)
122 #define M16C_EF_TRE BIT(7)
123
124 /* bittiming parameters */
125 #define KVASER_USB_TSEG1_MIN 1
126 #define KVASER_USB_TSEG1_MAX 16
127 #define KVASER_USB_TSEG2_MIN 1
128 #define KVASER_USB_TSEG2_MAX 8
129 #define KVASER_USB_SJW_MAX 4
130 #define KVASER_USB_BRP_MIN 1
131 #define KVASER_USB_BRP_MAX 64
132 #define KVASER_USB_BRP_INC 1
133
134 /* ctrl modes */
135 #define KVASER_CTRL_MODE_NORMAL 1
136 #define KVASER_CTRL_MODE_SILENT 2
137 #define KVASER_CTRL_MODE_SELFRECEPTION 3
138 #define KVASER_CTRL_MODE_OFF 4
139
140 /* log message */
141 #define KVASER_EXTENDED_FRAME BIT(31)
142
143 struct kvaser_msg_simple {
144 u8 tid;
145 u8 channel;
146 } __packed;
147
148 struct kvaser_msg_cardinfo {
149 u8 tid;
150 u8 nchannels;
151 __le32 serial_number;
152 __le32 padding;
153 __le32 clock_resolution;
154 __le32 mfgdate;
155 u8 ean[8];
156 u8 hw_revision;
157 u8 usb_hs_mode;
158 __le16 padding2;
159 } __packed;
160
161 struct kvaser_msg_cardinfo2 {
162 u8 tid;
163 u8 channel;
164 u8 pcb_id[24];
165 __le32 oem_unlock_code;
166 } __packed;
167
168 struct kvaser_msg_softinfo {
169 u8 tid;
170 u8 channel;
171 __le32 sw_options;
172 __le32 fw_version;
173 __le16 max_outstanding_tx;
174 __le16 padding[9];
175 } __packed;
176
177 struct kvaser_msg_busparams {
178 u8 tid;
179 u8 channel;
180 __le32 bitrate;
181 u8 tseg1;
182 u8 tseg2;
183 u8 sjw;
184 u8 no_samp;
185 } __packed;
186
187 struct kvaser_msg_tx_can {
188 u8 channel;
189 u8 tid;
190 u8 msg[14];
191 u8 padding;
192 u8 flags;
193 } __packed;
194
195 struct kvaser_msg_rx_can {
196 u8 channel;
197 u8 flag;
198 __le16 time[3];
199 u8 msg[14];
200 } __packed;
201
202 struct kvaser_msg_chip_state_event {
203 u8 tid;
204 u8 channel;
205 __le16 time[3];
206 u8 tx_errors_count;
207 u8 rx_errors_count;
208 u8 status;
209 u8 padding[3];
210 } __packed;
211
212 struct kvaser_msg_tx_acknowledge {
213 u8 channel;
214 u8 tid;
215 __le16 time[3];
216 u8 flags;
217 u8 time_offset;
218 } __packed;
219
220 struct kvaser_msg_error_event {
221 u8 tid;
222 u8 flags;
223 __le16 time[3];
224 u8 channel;
225 u8 padding;
226 u8 tx_errors_count;
227 u8 rx_errors_count;
228 u8 status;
229 u8 error_factor;
230 } __packed;
231
232 struct kvaser_msg_ctrl_mode {
233 u8 tid;
234 u8 channel;
235 u8 ctrl_mode;
236 u8 padding[3];
237 } __packed;
238
239 struct kvaser_msg_flush_queue {
240 u8 tid;
241 u8 channel;
242 u8 flags;
243 u8 padding[3];
244 } __packed;
245
246 struct kvaser_msg_log_message {
247 u8 channel;
248 u8 flags;
249 __le16 time[3];
250 u8 dlc;
251 u8 time_offset;
252 __le32 id;
253 u8 data[8];
254 } __packed;
255
256 struct kvaser_msg {
257 u8 len;
258 u8 id;
259 union {
260 struct kvaser_msg_simple simple;
261 struct kvaser_msg_cardinfo cardinfo;
262 struct kvaser_msg_cardinfo2 cardinfo2;
263 struct kvaser_msg_softinfo softinfo;
264 struct kvaser_msg_busparams busparams;
265 struct kvaser_msg_tx_can tx_can;
266 struct kvaser_msg_rx_can rx_can;
267 struct kvaser_msg_chip_state_event chip_state_event;
268 struct kvaser_msg_tx_acknowledge tx_acknowledge;
269 struct kvaser_msg_error_event error_event;
270 struct kvaser_msg_ctrl_mode ctrl_mode;
271 struct kvaser_msg_flush_queue flush_queue;
272 struct kvaser_msg_log_message log_message;
273 } u;
274 } __packed;
275
276 struct kvaser_usb_error_summary {
277 u8 channel, status, txerr, rxerr, error_factor;
278 };
279
280 struct kvaser_usb_tx_urb_context {
281 struct kvaser_usb_net_priv *priv;
282 u32 echo_index;
283 int dlc;
284 };
285
286 struct kvaser_usb {
287 struct usb_device *udev;
288 struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
289
290 struct usb_endpoint_descriptor *bulk_in, *bulk_out;
291 struct usb_anchor rx_submitted;
292
293 u32 fw_version;
294 unsigned int nchannels;
295
296 bool rxinitdone;
297 void *rxbuf[MAX_RX_URBS];
298 dma_addr_t rxbuf_dma[MAX_RX_URBS];
299 };
300
301 struct kvaser_usb_net_priv {
302 struct can_priv can;
303
304 atomic_t active_tx_urbs;
305 struct usb_anchor tx_submitted;
306 struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
307
308 struct completion start_comp, stop_comp;
309
310 struct kvaser_usb *dev;
311 struct net_device *netdev;
312 int channel;
313
314 struct can_berr_counter bec;
315 };
316
317 static const struct usb_device_id kvaser_usb_table[] = {
318 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
319 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
320 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
321 .driver_info = KVASER_HAS_TXRX_ERRORS |
322 KVASER_HAS_SILENT_MODE },
323 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
324 .driver_info = KVASER_HAS_TXRX_ERRORS |
325 KVASER_HAS_SILENT_MODE },
326 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
327 .driver_info = KVASER_HAS_TXRX_ERRORS |
328 KVASER_HAS_SILENT_MODE },
329 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
330 .driver_info = KVASER_HAS_TXRX_ERRORS |
331 KVASER_HAS_SILENT_MODE },
332 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
333 .driver_info = KVASER_HAS_TXRX_ERRORS |
334 KVASER_HAS_SILENT_MODE },
335 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
336 .driver_info = KVASER_HAS_TXRX_ERRORS |
337 KVASER_HAS_SILENT_MODE },
338 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
339 .driver_info = KVASER_HAS_TXRX_ERRORS |
340 KVASER_HAS_SILENT_MODE },
341 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
342 .driver_info = KVASER_HAS_TXRX_ERRORS |
343 KVASER_HAS_SILENT_MODE },
344 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
345 .driver_info = KVASER_HAS_TXRX_ERRORS |
346 KVASER_HAS_SILENT_MODE },
347 { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
348 .driver_info = KVASER_HAS_TXRX_ERRORS },
349 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
350 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
351 .driver_info = KVASER_HAS_TXRX_ERRORS |
352 KVASER_HAS_SILENT_MODE },
353 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
354 .driver_info = KVASER_HAS_TXRX_ERRORS },
355 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
356 .driver_info = KVASER_HAS_TXRX_ERRORS },
357 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
358 .driver_info = KVASER_HAS_TXRX_ERRORS },
359 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
360 .driver_info = KVASER_HAS_TXRX_ERRORS },
361 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
362 .driver_info = KVASER_HAS_TXRX_ERRORS },
363 { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
364 .driver_info = KVASER_HAS_TXRX_ERRORS },
365 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
366 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
367 { }
368 };
369 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
370
371 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
372 struct kvaser_msg *msg)
373 {
374 int actual_len;
375
376 return usb_bulk_msg(dev->udev,
377 usb_sndbulkpipe(dev->udev,
378 dev->bulk_out->bEndpointAddress),
379 msg, msg->len, &actual_len,
380 USB_SEND_TIMEOUT);
381 }
382
383 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
384 struct kvaser_msg *msg)
385 {
386 struct kvaser_msg *tmp;
387 void *buf;
388 int actual_len;
389 int err;
390 int pos;
391 unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
392
393 buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
394 if (!buf)
395 return -ENOMEM;
396
397 do {
398 err = usb_bulk_msg(dev->udev,
399 usb_rcvbulkpipe(dev->udev,
400 dev->bulk_in->bEndpointAddress),
401 buf, RX_BUFFER_SIZE, &actual_len,
402 USB_RECV_TIMEOUT);
403 if (err < 0)
404 goto end;
405
406 pos = 0;
407 while (pos <= actual_len - MSG_HEADER_LEN) {
408 tmp = buf + pos;
409
410 if (!tmp->len)
411 break;
412
413 if (pos + tmp->len > actual_len) {
414 dev_err(dev->udev->dev.parent,
415 "Format error\n");
416 break;
417 }
418
419 if (tmp->id == id) {
420 memcpy(msg, tmp, tmp->len);
421 goto end;
422 }
423
424 pos += tmp->len;
425 }
426 } while (time_before(jiffies, to));
427
428 err = -EINVAL;
429
430 end:
431 kfree(buf);
432
433 return err;
434 }
435
436 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
437 u8 msg_id, int channel)
438 {
439 struct kvaser_msg *msg;
440 int rc;
441
442 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
443 if (!msg)
444 return -ENOMEM;
445
446 msg->id = msg_id;
447 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
448 msg->u.simple.channel = channel;
449 msg->u.simple.tid = 0xff;
450
451 rc = kvaser_usb_send_msg(dev, msg);
452
453 kfree(msg);
454 return rc;
455 }
456
457 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
458 {
459 struct kvaser_msg msg;
460 int err;
461
462 err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
463 if (err)
464 return err;
465
466 err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
467 if (err)
468 return err;
469
470 dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version);
471
472 return 0;
473 }
474
475 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
476 {
477 struct kvaser_msg msg;
478 int err;
479
480 err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
481 if (err)
482 return err;
483
484 err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
485 if (err)
486 return err;
487
488 dev->nchannels = msg.u.cardinfo.nchannels;
489 if (dev->nchannels > MAX_NET_DEVICES)
490 return -EINVAL;
491
492 return 0;
493 }
494
495 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
496 const struct kvaser_msg *msg)
497 {
498 struct net_device_stats *stats;
499 struct kvaser_usb_tx_urb_context *context;
500 struct kvaser_usb_net_priv *priv;
501 struct sk_buff *skb;
502 struct can_frame *cf;
503 u8 channel = msg->u.tx_acknowledge.channel;
504 u8 tid = msg->u.tx_acknowledge.tid;
505
506 if (channel >= dev->nchannels) {
507 dev_err(dev->udev->dev.parent,
508 "Invalid channel number (%d)\n", channel);
509 return;
510 }
511
512 priv = dev->nets[channel];
513
514 if (!netif_device_present(priv->netdev))
515 return;
516
517 stats = &priv->netdev->stats;
518
519 context = &priv->tx_contexts[tid % MAX_TX_URBS];
520
521 /* Sometimes the state change doesn't come after a bus-off event */
522 if (priv->can.restart_ms &&
523 (priv->can.state >= CAN_STATE_BUS_OFF)) {
524 skb = alloc_can_err_skb(priv->netdev, &cf);
525 if (skb) {
526 cf->can_id |= CAN_ERR_RESTARTED;
527
528 stats->rx_packets++;
529 stats->rx_bytes += cf->can_dlc;
530 netif_rx(skb);
531 } else {
532 netdev_err(priv->netdev,
533 "No memory left for err_skb\n");
534 }
535
536 priv->can.can_stats.restarts++;
537 netif_carrier_on(priv->netdev);
538
539 priv->can.state = CAN_STATE_ERROR_ACTIVE;
540 }
541
542 stats->tx_packets++;
543 stats->tx_bytes += context->dlc;
544 can_get_echo_skb(priv->netdev, context->echo_index);
545
546 context->echo_index = MAX_TX_URBS;
547 atomic_dec(&priv->active_tx_urbs);
548
549 netif_wake_queue(priv->netdev);
550 }
551
552 static void kvaser_usb_simple_msg_callback(struct urb *urb)
553 {
554 struct net_device *netdev = urb->context;
555
556 kfree(urb->transfer_buffer);
557
558 if (urb->status)
559 netdev_warn(netdev, "urb status received: %d\n",
560 urb->status);
561 }
562
563 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
564 u8 msg_id)
565 {
566 struct kvaser_usb *dev = priv->dev;
567 struct net_device *netdev = priv->netdev;
568 struct kvaser_msg *msg;
569 struct urb *urb;
570 void *buf;
571 int err;
572
573 urb = usb_alloc_urb(0, GFP_ATOMIC);
574 if (!urb) {
575 netdev_err(netdev, "No memory left for URBs\n");
576 return -ENOMEM;
577 }
578
579 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
580 if (!buf) {
581 usb_free_urb(urb);
582 return -ENOMEM;
583 }
584
585 msg = (struct kvaser_msg *)buf;
586 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
587 msg->id = msg_id;
588 msg->u.simple.channel = priv->channel;
589
590 usb_fill_bulk_urb(urb, dev->udev,
591 usb_sndbulkpipe(dev->udev,
592 dev->bulk_out->bEndpointAddress),
593 buf, msg->len,
594 kvaser_usb_simple_msg_callback, netdev);
595 usb_anchor_urb(urb, &priv->tx_submitted);
596
597 err = usb_submit_urb(urb, GFP_ATOMIC);
598 if (err) {
599 netdev_err(netdev, "Error transmitting URB\n");
600 usb_unanchor_urb(urb);
601 usb_free_urb(urb);
602 kfree(buf);
603 return err;
604 }
605
606 usb_free_urb(urb);
607
608 return 0;
609 }
610
611 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
612 {
613 int i;
614
615 usb_kill_anchored_urbs(&priv->tx_submitted);
616 atomic_set(&priv->active_tx_urbs, 0);
617
618 for (i = 0; i < MAX_TX_URBS; i++)
619 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
620 }
621
622 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
623 const struct kvaser_usb_error_summary *es,
624 struct can_frame *cf)
625 {
626 struct net_device_stats *stats;
627 enum can_state cur_state, new_state, tx_state, rx_state;
628
629 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
630
631 stats = &priv->netdev->stats;
632 new_state = cur_state = priv->can.state;
633
634 if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
635 new_state = CAN_STATE_BUS_OFF;
636 else if (es->status & M16C_STATE_BUS_PASSIVE)
637 new_state = CAN_STATE_ERROR_PASSIVE;
638 else if (es->status & M16C_STATE_BUS_ERROR) {
639 if ((es->txerr >= 256) || (es->rxerr >= 256))
640 new_state = CAN_STATE_BUS_OFF;
641 else if ((es->txerr >= 128) || (es->rxerr >= 128))
642 new_state = CAN_STATE_ERROR_PASSIVE;
643 else if ((es->txerr >= 96) || (es->rxerr >= 96))
644 new_state = CAN_STATE_ERROR_WARNING;
645 else if (cur_state > CAN_STATE_ERROR_ACTIVE)
646 new_state = CAN_STATE_ERROR_ACTIVE;
647 }
648
649 if (!es->status)
650 new_state = CAN_STATE_ERROR_ACTIVE;
651
652 if (new_state != cur_state) {
653 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
654 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
655
656 can_change_state(priv->netdev, cf, tx_state, rx_state);
657 }
658
659 if (priv->can.restart_ms &&
660 (cur_state >= CAN_STATE_BUS_OFF) &&
661 (new_state < CAN_STATE_BUS_OFF)) {
662 priv->can.can_stats.restarts++;
663 }
664
665 if (es->error_factor) {
666 priv->can.can_stats.bus_error++;
667 stats->rx_errors++;
668 }
669
670 priv->bec.txerr = es->txerr;
671 priv->bec.rxerr = es->rxerr;
672 }
673
674 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
675 const struct kvaser_msg *msg)
676 {
677 struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
678 struct sk_buff *skb;
679 struct net_device_stats *stats;
680 struct kvaser_usb_net_priv *priv;
681 struct kvaser_usb_error_summary es = { };
682 enum can_state old_state, new_state;
683
684 switch (msg->id) {
685 case CMD_CAN_ERROR_EVENT:
686 es.channel = msg->u.error_event.channel;
687 es.status = msg->u.error_event.status;
688 es.txerr = msg->u.error_event.tx_errors_count;
689 es.rxerr = msg->u.error_event.rx_errors_count;
690 es.error_factor = msg->u.error_event.error_factor;
691 break;
692 case CMD_LOG_MESSAGE:
693 es.channel = msg->u.log_message.channel;
694 es.status = msg->u.log_message.data[0];
695 es.txerr = msg->u.log_message.data[2];
696 es.rxerr = msg->u.log_message.data[3];
697 es.error_factor = msg->u.log_message.data[1];
698 break;
699 case CMD_CHIP_STATE_EVENT:
700 es.channel = msg->u.chip_state_event.channel;
701 es.status = msg->u.chip_state_event.status;
702 es.txerr = msg->u.chip_state_event.tx_errors_count;
703 es.rxerr = msg->u.chip_state_event.rx_errors_count;
704 es.error_factor = 0;
705 break;
706 default:
707 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
708 msg->id);
709 return;
710 }
711
712 if (es.channel >= dev->nchannels) {
713 dev_err(dev->udev->dev.parent,
714 "Invalid channel number (%d)\n", es.channel);
715 return;
716 }
717
718 priv = dev->nets[es.channel];
719 stats = &priv->netdev->stats;
720
721 /* Update all of the can interface's state and error counters before
722 * trying any memory allocation that can actually fail with -ENOMEM.
723 *
724 * We send a temporary stack-allocated error can frame to
725 * can_change_state() for the very same reason.
726 *
727 * TODO: Split can_change_state() responsibility between updating the
728 * can interface's state and counters, and the setting up of can error
729 * frame ID and data to userspace. Remove stack allocation afterwards.
730 */
731 old_state = priv->can.state;
732 kvaser_usb_rx_error_update_can_state(priv, &es, &tmp_cf);
733 new_state = priv->can.state;
734
735 skb = alloc_can_err_skb(priv->netdev, &cf);
736 if (!skb) {
737 stats->rx_dropped++;
738 return;
739 }
740 memcpy(cf, &tmp_cf, sizeof(*cf));
741
742 if (new_state != old_state) {
743 if (es.status &
744 (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
745 if (!priv->can.restart_ms)
746 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
747 netif_carrier_off(priv->netdev);
748 }
749
750 if (priv->can.restart_ms &&
751 (old_state >= CAN_STATE_BUS_OFF) &&
752 (new_state < CAN_STATE_BUS_OFF)) {
753 cf->can_id |= CAN_ERR_RESTARTED;
754 netif_carrier_on(priv->netdev);
755 }
756 }
757
758 if (es.error_factor) {
759 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
760
761 if (es.error_factor & M16C_EF_ACKE)
762 cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
763 if (es.error_factor & M16C_EF_CRCE)
764 cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
765 CAN_ERR_PROT_LOC_CRC_DEL);
766 if (es.error_factor & M16C_EF_FORME)
767 cf->data[2] |= CAN_ERR_PROT_FORM;
768 if (es.error_factor & M16C_EF_STFE)
769 cf->data[2] |= CAN_ERR_PROT_STUFF;
770 if (es.error_factor & M16C_EF_BITE0)
771 cf->data[2] |= CAN_ERR_PROT_BIT0;
772 if (es.error_factor & M16C_EF_BITE1)
773 cf->data[2] |= CAN_ERR_PROT_BIT1;
774 if (es.error_factor & M16C_EF_TRE)
775 cf->data[2] |= CAN_ERR_PROT_TX;
776 }
777
778 cf->data[6] = es.txerr;
779 cf->data[7] = es.rxerr;
780
781 stats->rx_packets++;
782 stats->rx_bytes += cf->can_dlc;
783 netif_rx(skb);
784 }
785
786 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
787 const struct kvaser_msg *msg)
788 {
789 struct can_frame *cf;
790 struct sk_buff *skb;
791 struct net_device_stats *stats = &priv->netdev->stats;
792
793 if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
794 MSG_FLAG_NERR)) {
795 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
796 msg->u.rx_can.flag);
797
798 stats->rx_errors++;
799 return;
800 }
801
802 if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) {
803 stats->rx_over_errors++;
804 stats->rx_errors++;
805
806 skb = alloc_can_err_skb(priv->netdev, &cf);
807 if (!skb) {
808 stats->rx_dropped++;
809 return;
810 }
811
812 cf->can_id |= CAN_ERR_CRTL;
813 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
814
815 stats->rx_packets++;
816 stats->rx_bytes += cf->can_dlc;
817 netif_rx(skb);
818 }
819 }
820
821 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
822 const struct kvaser_msg *msg)
823 {
824 struct kvaser_usb_net_priv *priv;
825 struct can_frame *cf;
826 struct sk_buff *skb;
827 struct net_device_stats *stats;
828 u8 channel = msg->u.rx_can.channel;
829
830 if (channel >= dev->nchannels) {
831 dev_err(dev->udev->dev.parent,
832 "Invalid channel number (%d)\n", channel);
833 return;
834 }
835
836 priv = dev->nets[channel];
837 stats = &priv->netdev->stats;
838
839 if ((msg->u.rx_can.flag & MSG_FLAG_ERROR_FRAME) &&
840 (msg->id == CMD_LOG_MESSAGE)) {
841 kvaser_usb_rx_error(dev, msg);
842 return;
843 } else if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
844 MSG_FLAG_NERR |
845 MSG_FLAG_OVERRUN)) {
846 kvaser_usb_rx_can_err(priv, msg);
847 return;
848 } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) {
849 netdev_warn(priv->netdev,
850 "Unhandled frame (flags: 0x%02x)",
851 msg->u.rx_can.flag);
852 return;
853 }
854
855 skb = alloc_can_skb(priv->netdev, &cf);
856 if (!skb) {
857 stats->tx_dropped++;
858 return;
859 }
860
861 if (msg->id == CMD_LOG_MESSAGE) {
862 cf->can_id = le32_to_cpu(msg->u.log_message.id);
863 if (cf->can_id & KVASER_EXTENDED_FRAME)
864 cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
865 else
866 cf->can_id &= CAN_SFF_MASK;
867
868 cf->can_dlc = get_can_dlc(msg->u.log_message.dlc);
869
870 if (msg->u.log_message.flags & MSG_FLAG_REMOTE_FRAME)
871 cf->can_id |= CAN_RTR_FLAG;
872 else
873 memcpy(cf->data, &msg->u.log_message.data,
874 cf->can_dlc);
875 } else {
876 cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) |
877 (msg->u.rx_can.msg[1] & 0x3f);
878
879 if (msg->id == CMD_RX_EXT_MESSAGE) {
880 cf->can_id <<= 18;
881 cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) |
882 ((msg->u.rx_can.msg[3] & 0xff) << 6) |
883 (msg->u.rx_can.msg[4] & 0x3f);
884 cf->can_id |= CAN_EFF_FLAG;
885 }
886
887 cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]);
888
889 if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME)
890 cf->can_id |= CAN_RTR_FLAG;
891 else
892 memcpy(cf->data, &msg->u.rx_can.msg[6],
893 cf->can_dlc);
894 }
895
896 stats->rx_packets++;
897 stats->rx_bytes += cf->can_dlc;
898 netif_rx(skb);
899 }
900
901 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
902 const struct kvaser_msg *msg)
903 {
904 struct kvaser_usb_net_priv *priv;
905 u8 channel = msg->u.simple.channel;
906
907 if (channel >= dev->nchannels) {
908 dev_err(dev->udev->dev.parent,
909 "Invalid channel number (%d)\n", channel);
910 return;
911 }
912
913 priv = dev->nets[channel];
914
915 if (completion_done(&priv->start_comp) &&
916 netif_queue_stopped(priv->netdev)) {
917 netif_wake_queue(priv->netdev);
918 } else {
919 netif_start_queue(priv->netdev);
920 complete(&priv->start_comp);
921 }
922 }
923
924 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
925 const struct kvaser_msg *msg)
926 {
927 struct kvaser_usb_net_priv *priv;
928 u8 channel = msg->u.simple.channel;
929
930 if (channel >= dev->nchannels) {
931 dev_err(dev->udev->dev.parent,
932 "Invalid channel number (%d)\n", channel);
933 return;
934 }
935
936 priv = dev->nets[channel];
937
938 complete(&priv->stop_comp);
939 }
940
941 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
942 const struct kvaser_msg *msg)
943 {
944 switch (msg->id) {
945 case CMD_START_CHIP_REPLY:
946 kvaser_usb_start_chip_reply(dev, msg);
947 break;
948
949 case CMD_STOP_CHIP_REPLY:
950 kvaser_usb_stop_chip_reply(dev, msg);
951 break;
952
953 case CMD_RX_STD_MESSAGE:
954 case CMD_RX_EXT_MESSAGE:
955 case CMD_LOG_MESSAGE:
956 kvaser_usb_rx_can_msg(dev, msg);
957 break;
958
959 case CMD_CHIP_STATE_EVENT:
960 case CMD_CAN_ERROR_EVENT:
961 kvaser_usb_rx_error(dev, msg);
962 break;
963
964 case CMD_TX_ACKNOWLEDGE:
965 kvaser_usb_tx_acknowledge(dev, msg);
966 break;
967
968 default:
969 dev_warn(dev->udev->dev.parent,
970 "Unhandled message (%d)\n", msg->id);
971 break;
972 }
973 }
974
975 static void kvaser_usb_read_bulk_callback(struct urb *urb)
976 {
977 struct kvaser_usb *dev = urb->context;
978 struct kvaser_msg *msg;
979 int pos = 0;
980 int err, i;
981
982 switch (urb->status) {
983 case 0:
984 break;
985 case -ENOENT:
986 case -ESHUTDOWN:
987 return;
988 default:
989 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
990 urb->status);
991 goto resubmit_urb;
992 }
993
994 while (pos <= urb->actual_length - MSG_HEADER_LEN) {
995 msg = urb->transfer_buffer + pos;
996
997 if (!msg->len)
998 break;
999
1000 if (pos + msg->len > urb->actual_length) {
1001 dev_err(dev->udev->dev.parent, "Format error\n");
1002 break;
1003 }
1004
1005 kvaser_usb_handle_message(dev, msg);
1006
1007 pos += msg->len;
1008 }
1009
1010 resubmit_urb:
1011 usb_fill_bulk_urb(urb, dev->udev,
1012 usb_rcvbulkpipe(dev->udev,
1013 dev->bulk_in->bEndpointAddress),
1014 urb->transfer_buffer, RX_BUFFER_SIZE,
1015 kvaser_usb_read_bulk_callback, dev);
1016
1017 err = usb_submit_urb(urb, GFP_ATOMIC);
1018 if (err == -ENODEV) {
1019 for (i = 0; i < dev->nchannels; i++) {
1020 if (!dev->nets[i])
1021 continue;
1022
1023 netif_device_detach(dev->nets[i]->netdev);
1024 }
1025 } else if (err) {
1026 dev_err(dev->udev->dev.parent,
1027 "Failed resubmitting read bulk urb: %d\n", err);
1028 }
1029
1030 return;
1031 }
1032
1033 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1034 {
1035 int i, err = 0;
1036
1037 if (dev->rxinitdone)
1038 return 0;
1039
1040 for (i = 0; i < MAX_RX_URBS; i++) {
1041 struct urb *urb = NULL;
1042 u8 *buf = NULL;
1043 dma_addr_t buf_dma;
1044
1045 urb = usb_alloc_urb(0, GFP_KERNEL);
1046 if (!urb) {
1047 dev_warn(dev->udev->dev.parent,
1048 "No memory left for URBs\n");
1049 err = -ENOMEM;
1050 break;
1051 }
1052
1053 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1054 GFP_KERNEL, &buf_dma);
1055 if (!buf) {
1056 dev_warn(dev->udev->dev.parent,
1057 "No memory left for USB buffer\n");
1058 usb_free_urb(urb);
1059 err = -ENOMEM;
1060 break;
1061 }
1062
1063 usb_fill_bulk_urb(urb, dev->udev,
1064 usb_rcvbulkpipe(dev->udev,
1065 dev->bulk_in->bEndpointAddress),
1066 buf, RX_BUFFER_SIZE,
1067 kvaser_usb_read_bulk_callback,
1068 dev);
1069 urb->transfer_dma = buf_dma;
1070 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1071 usb_anchor_urb(urb, &dev->rx_submitted);
1072
1073 err = usb_submit_urb(urb, GFP_KERNEL);
1074 if (err) {
1075 usb_unanchor_urb(urb);
1076 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1077 buf_dma);
1078 usb_free_urb(urb);
1079 break;
1080 }
1081
1082 dev->rxbuf[i] = buf;
1083 dev->rxbuf_dma[i] = buf_dma;
1084
1085 usb_free_urb(urb);
1086 }
1087
1088 if (i == 0) {
1089 dev_warn(dev->udev->dev.parent,
1090 "Cannot setup read URBs, error %d\n", err);
1091 return err;
1092 } else if (i < MAX_RX_URBS) {
1093 dev_warn(dev->udev->dev.parent,
1094 "RX performances may be slow\n");
1095 }
1096
1097 dev->rxinitdone = true;
1098
1099 return 0;
1100 }
1101
1102 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1103 {
1104 struct kvaser_msg *msg;
1105 int rc;
1106
1107 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1108 if (!msg)
1109 return -ENOMEM;
1110
1111 msg->id = CMD_SET_CTRL_MODE;
1112 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1113 msg->u.ctrl_mode.tid = 0xff;
1114 msg->u.ctrl_mode.channel = priv->channel;
1115
1116 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1117 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1118 else
1119 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1120
1121 rc = kvaser_usb_send_msg(priv->dev, msg);
1122
1123 kfree(msg);
1124 return rc;
1125 }
1126
1127 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1128 {
1129 int err;
1130
1131 init_completion(&priv->start_comp);
1132
1133 err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1134 priv->channel);
1135 if (err)
1136 return err;
1137
1138 if (!wait_for_completion_timeout(&priv->start_comp,
1139 msecs_to_jiffies(START_TIMEOUT)))
1140 return -ETIMEDOUT;
1141
1142 return 0;
1143 }
1144
1145 static int kvaser_usb_open(struct net_device *netdev)
1146 {
1147 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1148 struct kvaser_usb *dev = priv->dev;
1149 int err;
1150
1151 err = open_candev(netdev);
1152 if (err)
1153 return err;
1154
1155 err = kvaser_usb_setup_rx_urbs(dev);
1156 if (err)
1157 goto error;
1158
1159 err = kvaser_usb_set_opt_mode(priv);
1160 if (err)
1161 goto error;
1162
1163 err = kvaser_usb_start_chip(priv);
1164 if (err) {
1165 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1166 goto error;
1167 }
1168
1169 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1170
1171 return 0;
1172
1173 error:
1174 close_candev(netdev);
1175 return err;
1176 }
1177
1178 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1179 {
1180 int i;
1181
1182 usb_kill_anchored_urbs(&dev->rx_submitted);
1183
1184 for (i = 0; i < MAX_RX_URBS; i++)
1185 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1186 dev->rxbuf[i],
1187 dev->rxbuf_dma[i]);
1188
1189 for (i = 0; i < MAX_NET_DEVICES; i++) {
1190 struct kvaser_usb_net_priv *priv = dev->nets[i];
1191
1192 if (priv)
1193 kvaser_usb_unlink_tx_urbs(priv);
1194 }
1195 }
1196
1197 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1198 {
1199 int err;
1200
1201 init_completion(&priv->stop_comp);
1202
1203 err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1204 priv->channel);
1205 if (err)
1206 return err;
1207
1208 if (!wait_for_completion_timeout(&priv->stop_comp,
1209 msecs_to_jiffies(STOP_TIMEOUT)))
1210 return -ETIMEDOUT;
1211
1212 return 0;
1213 }
1214
1215 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1216 {
1217 struct kvaser_msg *msg;
1218 int rc;
1219
1220 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1221 if (!msg)
1222 return -ENOMEM;
1223
1224 msg->id = CMD_FLUSH_QUEUE;
1225 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1226 msg->u.flush_queue.channel = priv->channel;
1227 msg->u.flush_queue.flags = 0x00;
1228
1229 rc = kvaser_usb_send_msg(priv->dev, msg);
1230
1231 kfree(msg);
1232 return rc;
1233 }
1234
1235 static int kvaser_usb_close(struct net_device *netdev)
1236 {
1237 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1238 struct kvaser_usb *dev = priv->dev;
1239 int err;
1240
1241 netif_stop_queue(netdev);
1242
1243 err = kvaser_usb_flush_queue(priv);
1244 if (err)
1245 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1246
1247 if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1248 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1249
1250 err = kvaser_usb_stop_chip(priv);
1251 if (err)
1252 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1253
1254 /* reset tx contexts */
1255 kvaser_usb_unlink_tx_urbs(priv);
1256
1257 priv->can.state = CAN_STATE_STOPPED;
1258 close_candev(priv->netdev);
1259
1260 return 0;
1261 }
1262
1263 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1264 {
1265 struct kvaser_usb_tx_urb_context *context = urb->context;
1266 struct kvaser_usb_net_priv *priv;
1267 struct net_device *netdev;
1268
1269 if (WARN_ON(!context))
1270 return;
1271
1272 priv = context->priv;
1273 netdev = priv->netdev;
1274
1275 kfree(urb->transfer_buffer);
1276
1277 if (!netif_device_present(netdev))
1278 return;
1279
1280 if (urb->status)
1281 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1282 }
1283
1284 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1285 struct net_device *netdev)
1286 {
1287 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1288 struct kvaser_usb *dev = priv->dev;
1289 struct net_device_stats *stats = &netdev->stats;
1290 struct can_frame *cf = (struct can_frame *)skb->data;
1291 struct kvaser_usb_tx_urb_context *context = NULL;
1292 struct urb *urb;
1293 void *buf;
1294 struct kvaser_msg *msg;
1295 int i, err;
1296 int ret = NETDEV_TX_OK;
1297
1298 if (can_dropped_invalid_skb(netdev, skb))
1299 return NETDEV_TX_OK;
1300
1301 urb = usb_alloc_urb(0, GFP_ATOMIC);
1302 if (!urb) {
1303 netdev_err(netdev, "No memory left for URBs\n");
1304 stats->tx_dropped++;
1305 dev_kfree_skb(skb);
1306 return NETDEV_TX_OK;
1307 }
1308
1309 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1310 if (!buf) {
1311 stats->tx_dropped++;
1312 dev_kfree_skb(skb);
1313 goto nobufmem;
1314 }
1315
1316 msg = buf;
1317 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1318 msg->u.tx_can.flags = 0;
1319 msg->u.tx_can.channel = priv->channel;
1320
1321 if (cf->can_id & CAN_EFF_FLAG) {
1322 msg->id = CMD_TX_EXT_MESSAGE;
1323 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1324 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1325 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1326 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1327 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1328 } else {
1329 msg->id = CMD_TX_STD_MESSAGE;
1330 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1331 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1332 }
1333
1334 msg->u.tx_can.msg[5] = cf->can_dlc;
1335 memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1336
1337 if (cf->can_id & CAN_RTR_FLAG)
1338 msg->u.tx_can.flags |= MSG_FLAG_REMOTE_FRAME;
1339
1340 for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1341 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1342 context = &priv->tx_contexts[i];
1343 break;
1344 }
1345 }
1346
1347 /* This should never happen; it implies a flow control bug */
1348 if (!context) {
1349 netdev_warn(netdev, "cannot find free context\n");
1350 ret = NETDEV_TX_BUSY;
1351 goto releasebuf;
1352 }
1353
1354 context->priv = priv;
1355 context->echo_index = i;
1356 context->dlc = cf->can_dlc;
1357
1358 msg->u.tx_can.tid = context->echo_index;
1359
1360 usb_fill_bulk_urb(urb, dev->udev,
1361 usb_sndbulkpipe(dev->udev,
1362 dev->bulk_out->bEndpointAddress),
1363 buf, msg->len,
1364 kvaser_usb_write_bulk_callback, context);
1365 usb_anchor_urb(urb, &priv->tx_submitted);
1366
1367 can_put_echo_skb(skb, netdev, context->echo_index);
1368
1369 atomic_inc(&priv->active_tx_urbs);
1370
1371 if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
1372 netif_stop_queue(netdev);
1373
1374 err = usb_submit_urb(urb, GFP_ATOMIC);
1375 if (unlikely(err)) {
1376 can_free_echo_skb(netdev, context->echo_index);
1377
1378 atomic_dec(&priv->active_tx_urbs);
1379 usb_unanchor_urb(urb);
1380
1381 stats->tx_dropped++;
1382
1383 if (err == -ENODEV)
1384 netif_device_detach(netdev);
1385 else
1386 netdev_warn(netdev, "Failed tx_urb %d\n", err);
1387
1388 goto releasebuf;
1389 }
1390
1391 usb_free_urb(urb);
1392
1393 return NETDEV_TX_OK;
1394
1395 releasebuf:
1396 kfree(buf);
1397 nobufmem:
1398 usb_free_urb(urb);
1399 return ret;
1400 }
1401
1402 static const struct net_device_ops kvaser_usb_netdev_ops = {
1403 .ndo_open = kvaser_usb_open,
1404 .ndo_stop = kvaser_usb_close,
1405 .ndo_start_xmit = kvaser_usb_start_xmit,
1406 .ndo_change_mtu = can_change_mtu,
1407 };
1408
1409 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1410 .name = "kvaser_usb",
1411 .tseg1_min = KVASER_USB_TSEG1_MIN,
1412 .tseg1_max = KVASER_USB_TSEG1_MAX,
1413 .tseg2_min = KVASER_USB_TSEG2_MIN,
1414 .tseg2_max = KVASER_USB_TSEG2_MAX,
1415 .sjw_max = KVASER_USB_SJW_MAX,
1416 .brp_min = KVASER_USB_BRP_MIN,
1417 .brp_max = KVASER_USB_BRP_MAX,
1418 .brp_inc = KVASER_USB_BRP_INC,
1419 };
1420
1421 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1422 {
1423 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1424 struct can_bittiming *bt = &priv->can.bittiming;
1425 struct kvaser_usb *dev = priv->dev;
1426 struct kvaser_msg *msg;
1427 int rc;
1428
1429 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1430 if (!msg)
1431 return -ENOMEM;
1432
1433 msg->id = CMD_SET_BUS_PARAMS;
1434 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1435 msg->u.busparams.channel = priv->channel;
1436 msg->u.busparams.tid = 0xff;
1437 msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1438 msg->u.busparams.sjw = bt->sjw;
1439 msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1440 msg->u.busparams.tseg2 = bt->phase_seg2;
1441
1442 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1443 msg->u.busparams.no_samp = 3;
1444 else
1445 msg->u.busparams.no_samp = 1;
1446
1447 rc = kvaser_usb_send_msg(dev, msg);
1448
1449 kfree(msg);
1450 return rc;
1451 }
1452
1453 static int kvaser_usb_set_mode(struct net_device *netdev,
1454 enum can_mode mode)
1455 {
1456 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1457 int err;
1458
1459 switch (mode) {
1460 case CAN_MODE_START:
1461 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1462 if (err)
1463 return err;
1464 break;
1465 default:
1466 return -EOPNOTSUPP;
1467 }
1468
1469 return 0;
1470 }
1471
1472 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1473 struct can_berr_counter *bec)
1474 {
1475 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1476
1477 *bec = priv->bec;
1478
1479 return 0;
1480 }
1481
1482 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1483 {
1484 int i;
1485
1486 for (i = 0; i < dev->nchannels; i++) {
1487 if (!dev->nets[i])
1488 continue;
1489
1490 unregister_netdev(dev->nets[i]->netdev);
1491 }
1492
1493 kvaser_usb_unlink_all_urbs(dev);
1494
1495 for (i = 0; i < dev->nchannels; i++) {
1496 if (!dev->nets[i])
1497 continue;
1498
1499 free_candev(dev->nets[i]->netdev);
1500 }
1501 }
1502
1503 static int kvaser_usb_init_one(struct usb_interface *intf,
1504 const struct usb_device_id *id, int channel)
1505 {
1506 struct kvaser_usb *dev = usb_get_intfdata(intf);
1507 struct net_device *netdev;
1508 struct kvaser_usb_net_priv *priv;
1509 int i, err;
1510
1511 err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1512 if (err)
1513 return err;
1514
1515 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1516 if (!netdev) {
1517 dev_err(&intf->dev, "Cannot alloc candev\n");
1518 return -ENOMEM;
1519 }
1520
1521 priv = netdev_priv(netdev);
1522
1523 init_completion(&priv->start_comp);
1524 init_completion(&priv->stop_comp);
1525
1526 init_usb_anchor(&priv->tx_submitted);
1527 atomic_set(&priv->active_tx_urbs, 0);
1528
1529 for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++)
1530 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1531
1532 priv->dev = dev;
1533 priv->netdev = netdev;
1534 priv->channel = channel;
1535
1536 priv->can.state = CAN_STATE_STOPPED;
1537 priv->can.clock.freq = CAN_USB_CLOCK;
1538 priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1539 priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1540 priv->can.do_set_mode = kvaser_usb_set_mode;
1541 if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1542 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1543 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1544 if (id->driver_info & KVASER_HAS_SILENT_MODE)
1545 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1546
1547 netdev->flags |= IFF_ECHO;
1548
1549 netdev->netdev_ops = &kvaser_usb_netdev_ops;
1550
1551 SET_NETDEV_DEV(netdev, &intf->dev);
1552 netdev->dev_id = channel;
1553
1554 dev->nets[channel] = priv;
1555
1556 err = register_candev(netdev);
1557 if (err) {
1558 dev_err(&intf->dev, "Failed to register can device\n");
1559 free_candev(netdev);
1560 dev->nets[channel] = NULL;
1561 return err;
1562 }
1563
1564 netdev_dbg(netdev, "device registered\n");
1565
1566 return 0;
1567 }
1568
1569 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1570 struct usb_endpoint_descriptor **in,
1571 struct usb_endpoint_descriptor **out)
1572 {
1573 const struct usb_host_interface *iface_desc;
1574 struct usb_endpoint_descriptor *endpoint;
1575 int i;
1576
1577 iface_desc = &intf->altsetting[0];
1578
1579 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1580 endpoint = &iface_desc->endpoint[i].desc;
1581
1582 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1583 *in = endpoint;
1584
1585 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1586 *out = endpoint;
1587
1588 /* use first bulk endpoint for in and out */
1589 if (*in && *out)
1590 return 0;
1591 }
1592
1593 return -ENODEV;
1594 }
1595
1596 static int kvaser_usb_probe(struct usb_interface *intf,
1597 const struct usb_device_id *id)
1598 {
1599 struct kvaser_usb *dev;
1600 int err = -ENOMEM;
1601 int i, retry = 3;
1602
1603 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1604 if (!dev)
1605 return -ENOMEM;
1606
1607 err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1608 if (err) {
1609 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1610 return err;
1611 }
1612
1613 dev->udev = interface_to_usbdev(intf);
1614
1615 init_usb_anchor(&dev->rx_submitted);
1616
1617 usb_set_intfdata(intf, dev);
1618
1619 /* On some x86 laptops, plugging a Kvaser device again after
1620 * an unplug makes the firmware always ignore the very first
1621 * command. For such a case, provide some room for retries
1622 * instead of completely exiting the driver.
1623 */
1624 do {
1625 err = kvaser_usb_get_software_info(dev);
1626 } while (--retry && err == -ETIMEDOUT);
1627
1628 if (err) {
1629 dev_err(&intf->dev,
1630 "Cannot get software infos, error %d\n", err);
1631 return err;
1632 }
1633
1634 err = kvaser_usb_get_card_info(dev);
1635 if (err) {
1636 dev_err(&intf->dev,
1637 "Cannot get card infos, error %d\n", err);
1638 return err;
1639 }
1640
1641 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
1642 ((dev->fw_version >> 24) & 0xff),
1643 ((dev->fw_version >> 16) & 0xff),
1644 (dev->fw_version & 0xffff));
1645
1646 for (i = 0; i < dev->nchannels; i++) {
1647 err = kvaser_usb_init_one(intf, id, i);
1648 if (err) {
1649 kvaser_usb_remove_interfaces(dev);
1650 return err;
1651 }
1652 }
1653
1654 return 0;
1655 }
1656
1657 static void kvaser_usb_disconnect(struct usb_interface *intf)
1658 {
1659 struct kvaser_usb *dev = usb_get_intfdata(intf);
1660
1661 usb_set_intfdata(intf, NULL);
1662
1663 if (!dev)
1664 return;
1665
1666 kvaser_usb_remove_interfaces(dev);
1667 }
1668
1669 static struct usb_driver kvaser_usb_driver = {
1670 .name = "kvaser_usb",
1671 .probe = kvaser_usb_probe,
1672 .disconnect = kvaser_usb_disconnect,
1673 .id_table = kvaser_usb_table,
1674 };
1675
1676 module_usb_driver(kvaser_usb_driver);
1677
1678 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
1679 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
1680 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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