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