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Merge remote-tracking branches 'spi/topic/img-spfi', 'spi/topic/imx', 'spi/topic...
[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_tx_urb_context {
277 struct kvaser_usb_net_priv *priv;
278 u32 echo_index;
279 int dlc;
280 };
281
282 struct kvaser_usb {
283 struct usb_device *udev;
284 struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
285
286 struct usb_endpoint_descriptor *bulk_in, *bulk_out;
287 struct usb_anchor rx_submitted;
288
289 u32 fw_version;
290 unsigned int nchannels;
291
292 bool rxinitdone;
293 void *rxbuf[MAX_RX_URBS];
294 dma_addr_t rxbuf_dma[MAX_RX_URBS];
295 };
296
297 struct kvaser_usb_net_priv {
298 struct can_priv can;
299
300 atomic_t active_tx_urbs;
301 struct usb_anchor tx_submitted;
302 struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
303
304 struct completion start_comp, stop_comp;
305
306 struct kvaser_usb *dev;
307 struct net_device *netdev;
308 int channel;
309
310 struct can_berr_counter bec;
311 };
312
313 static const struct usb_device_id kvaser_usb_table[] = {
314 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
315 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
316 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
317 .driver_info = KVASER_HAS_TXRX_ERRORS |
318 KVASER_HAS_SILENT_MODE },
319 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
320 .driver_info = KVASER_HAS_TXRX_ERRORS |
321 KVASER_HAS_SILENT_MODE },
322 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
323 .driver_info = KVASER_HAS_TXRX_ERRORS |
324 KVASER_HAS_SILENT_MODE },
325 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
326 .driver_info = KVASER_HAS_TXRX_ERRORS |
327 KVASER_HAS_SILENT_MODE },
328 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
329 .driver_info = KVASER_HAS_TXRX_ERRORS |
330 KVASER_HAS_SILENT_MODE },
331 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
332 .driver_info = KVASER_HAS_TXRX_ERRORS |
333 KVASER_HAS_SILENT_MODE },
334 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
335 .driver_info = KVASER_HAS_TXRX_ERRORS |
336 KVASER_HAS_SILENT_MODE },
337 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
338 .driver_info = KVASER_HAS_TXRX_ERRORS |
339 KVASER_HAS_SILENT_MODE },
340 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
341 .driver_info = KVASER_HAS_TXRX_ERRORS |
342 KVASER_HAS_SILENT_MODE },
343 { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
344 .driver_info = KVASER_HAS_TXRX_ERRORS },
345 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
346 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
347 .driver_info = KVASER_HAS_TXRX_ERRORS |
348 KVASER_HAS_SILENT_MODE },
349 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
350 .driver_info = KVASER_HAS_TXRX_ERRORS },
351 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
352 .driver_info = KVASER_HAS_TXRX_ERRORS },
353 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
354 .driver_info = KVASER_HAS_TXRX_ERRORS },
355 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
356 .driver_info = KVASER_HAS_TXRX_ERRORS },
357 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
358 .driver_info = KVASER_HAS_TXRX_ERRORS },
359 { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
360 .driver_info = KVASER_HAS_TXRX_ERRORS },
361 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
362 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
363 { }
364 };
365 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
366
367 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
368 struct kvaser_msg *msg)
369 {
370 int actual_len;
371
372 return usb_bulk_msg(dev->udev,
373 usb_sndbulkpipe(dev->udev,
374 dev->bulk_out->bEndpointAddress),
375 msg, msg->len, &actual_len,
376 USB_SEND_TIMEOUT);
377 }
378
379 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
380 struct kvaser_msg *msg)
381 {
382 struct kvaser_msg *tmp;
383 void *buf;
384 int actual_len;
385 int err;
386 int pos;
387 unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
388
389 buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
390 if (!buf)
391 return -ENOMEM;
392
393 do {
394 err = usb_bulk_msg(dev->udev,
395 usb_rcvbulkpipe(dev->udev,
396 dev->bulk_in->bEndpointAddress),
397 buf, RX_BUFFER_SIZE, &actual_len,
398 USB_RECV_TIMEOUT);
399 if (err < 0)
400 goto end;
401
402 pos = 0;
403 while (pos <= actual_len - MSG_HEADER_LEN) {
404 tmp = buf + pos;
405
406 if (!tmp->len)
407 break;
408
409 if (pos + tmp->len > actual_len) {
410 dev_err(dev->udev->dev.parent,
411 "Format error\n");
412 break;
413 }
414
415 if (tmp->id == id) {
416 memcpy(msg, tmp, tmp->len);
417 goto end;
418 }
419
420 pos += tmp->len;
421 }
422 } while (time_before(jiffies, to));
423
424 err = -EINVAL;
425
426 end:
427 kfree(buf);
428
429 return err;
430 }
431
432 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
433 u8 msg_id, int channel)
434 {
435 struct kvaser_msg *msg;
436 int rc;
437
438 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
439 if (!msg)
440 return -ENOMEM;
441
442 msg->id = msg_id;
443 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
444 msg->u.simple.channel = channel;
445 msg->u.simple.tid = 0xff;
446
447 rc = kvaser_usb_send_msg(dev, msg);
448
449 kfree(msg);
450 return rc;
451 }
452
453 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
454 {
455 struct kvaser_msg msg;
456 int err;
457
458 err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
459 if (err)
460 return err;
461
462 err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
463 if (err)
464 return err;
465
466 dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version);
467
468 return 0;
469 }
470
471 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
472 {
473 struct kvaser_msg msg;
474 int err;
475
476 err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
477 if (err)
478 return err;
479
480 err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
481 if (err)
482 return err;
483
484 dev->nchannels = msg.u.cardinfo.nchannels;
485 if (dev->nchannels > MAX_NET_DEVICES)
486 return -EINVAL;
487
488 return 0;
489 }
490
491 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
492 const struct kvaser_msg *msg)
493 {
494 struct net_device_stats *stats;
495 struct kvaser_usb_tx_urb_context *context;
496 struct kvaser_usb_net_priv *priv;
497 struct sk_buff *skb;
498 struct can_frame *cf;
499 u8 channel = msg->u.tx_acknowledge.channel;
500 u8 tid = msg->u.tx_acknowledge.tid;
501
502 if (channel >= dev->nchannels) {
503 dev_err(dev->udev->dev.parent,
504 "Invalid channel number (%d)\n", channel);
505 return;
506 }
507
508 priv = dev->nets[channel];
509
510 if (!netif_device_present(priv->netdev))
511 return;
512
513 stats = &priv->netdev->stats;
514
515 context = &priv->tx_contexts[tid % MAX_TX_URBS];
516
517 /* Sometimes the state change doesn't come after a bus-off event */
518 if (priv->can.restart_ms &&
519 (priv->can.state >= CAN_STATE_BUS_OFF)) {
520 skb = alloc_can_err_skb(priv->netdev, &cf);
521 if (skb) {
522 cf->can_id |= CAN_ERR_RESTARTED;
523
524 stats->rx_packets++;
525 stats->rx_bytes += cf->can_dlc;
526 netif_rx(skb);
527 } else {
528 netdev_err(priv->netdev,
529 "No memory left for err_skb\n");
530 }
531
532 priv->can.can_stats.restarts++;
533 netif_carrier_on(priv->netdev);
534
535 priv->can.state = CAN_STATE_ERROR_ACTIVE;
536 }
537
538 stats->tx_packets++;
539 stats->tx_bytes += context->dlc;
540 can_get_echo_skb(priv->netdev, context->echo_index);
541
542 context->echo_index = MAX_TX_URBS;
543 atomic_dec(&priv->active_tx_urbs);
544
545 netif_wake_queue(priv->netdev);
546 }
547
548 static void kvaser_usb_simple_msg_callback(struct urb *urb)
549 {
550 struct net_device *netdev = urb->context;
551
552 kfree(urb->transfer_buffer);
553
554 if (urb->status)
555 netdev_warn(netdev, "urb status received: %d\n",
556 urb->status);
557 }
558
559 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
560 u8 msg_id)
561 {
562 struct kvaser_usb *dev = priv->dev;
563 struct net_device *netdev = priv->netdev;
564 struct kvaser_msg *msg;
565 struct urb *urb;
566 void *buf;
567 int err;
568
569 urb = usb_alloc_urb(0, GFP_ATOMIC);
570 if (!urb) {
571 netdev_err(netdev, "No memory left for URBs\n");
572 return -ENOMEM;
573 }
574
575 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
576 if (!buf) {
577 usb_free_urb(urb);
578 return -ENOMEM;
579 }
580
581 msg = (struct kvaser_msg *)buf;
582 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
583 msg->id = msg_id;
584 msg->u.simple.channel = priv->channel;
585
586 usb_fill_bulk_urb(urb, dev->udev,
587 usb_sndbulkpipe(dev->udev,
588 dev->bulk_out->bEndpointAddress),
589 buf, msg->len,
590 kvaser_usb_simple_msg_callback, netdev);
591 usb_anchor_urb(urb, &priv->tx_submitted);
592
593 err = usb_submit_urb(urb, GFP_ATOMIC);
594 if (err) {
595 netdev_err(netdev, "Error transmitting URB\n");
596 usb_unanchor_urb(urb);
597 usb_free_urb(urb);
598 kfree(buf);
599 return err;
600 }
601
602 usb_free_urb(urb);
603
604 return 0;
605 }
606
607 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
608 {
609 int i;
610
611 usb_kill_anchored_urbs(&priv->tx_submitted);
612 atomic_set(&priv->active_tx_urbs, 0);
613
614 for (i = 0; i < MAX_TX_URBS; i++)
615 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
616 }
617
618 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
619 const struct kvaser_msg *msg)
620 {
621 struct can_frame *cf;
622 struct sk_buff *skb;
623 struct net_device_stats *stats;
624 struct kvaser_usb_net_priv *priv;
625 unsigned int new_state;
626 u8 channel, status, txerr, rxerr, error_factor;
627
628 switch (msg->id) {
629 case CMD_CAN_ERROR_EVENT:
630 channel = msg->u.error_event.channel;
631 status = msg->u.error_event.status;
632 txerr = msg->u.error_event.tx_errors_count;
633 rxerr = msg->u.error_event.rx_errors_count;
634 error_factor = msg->u.error_event.error_factor;
635 break;
636 case CMD_LOG_MESSAGE:
637 channel = msg->u.log_message.channel;
638 status = msg->u.log_message.data[0];
639 txerr = msg->u.log_message.data[2];
640 rxerr = msg->u.log_message.data[3];
641 error_factor = msg->u.log_message.data[1];
642 break;
643 case CMD_CHIP_STATE_EVENT:
644 channel = msg->u.chip_state_event.channel;
645 status = msg->u.chip_state_event.status;
646 txerr = msg->u.chip_state_event.tx_errors_count;
647 rxerr = msg->u.chip_state_event.rx_errors_count;
648 error_factor = 0;
649 break;
650 default:
651 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
652 msg->id);
653 return;
654 }
655
656 if (channel >= dev->nchannels) {
657 dev_err(dev->udev->dev.parent,
658 "Invalid channel number (%d)\n", channel);
659 return;
660 }
661
662 priv = dev->nets[channel];
663 stats = &priv->netdev->stats;
664
665 skb = alloc_can_err_skb(priv->netdev, &cf);
666 if (!skb) {
667 stats->rx_dropped++;
668 return;
669 }
670
671 new_state = priv->can.state;
672
673 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status);
674
675 if (status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
676 cf->can_id |= CAN_ERR_BUSOFF;
677
678 priv->can.can_stats.bus_off++;
679 if (!priv->can.restart_ms)
680 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
681
682 netif_carrier_off(priv->netdev);
683
684 new_state = CAN_STATE_BUS_OFF;
685 } else if (status & M16C_STATE_BUS_PASSIVE) {
686 if (priv->can.state != CAN_STATE_ERROR_PASSIVE) {
687 cf->can_id |= CAN_ERR_CRTL;
688
689 if (txerr || rxerr)
690 cf->data[1] = (txerr > rxerr)
691 ? CAN_ERR_CRTL_TX_PASSIVE
692 : CAN_ERR_CRTL_RX_PASSIVE;
693 else
694 cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE |
695 CAN_ERR_CRTL_RX_PASSIVE;
696
697 priv->can.can_stats.error_passive++;
698 }
699
700 new_state = CAN_STATE_ERROR_PASSIVE;
701 } else if (status & M16C_STATE_BUS_ERROR) {
702 if ((priv->can.state < CAN_STATE_ERROR_WARNING) &&
703 ((txerr >= 96) || (rxerr >= 96))) {
704 cf->can_id |= CAN_ERR_CRTL;
705 cf->data[1] = (txerr > rxerr)
706 ? CAN_ERR_CRTL_TX_WARNING
707 : CAN_ERR_CRTL_RX_WARNING;
708
709 priv->can.can_stats.error_warning++;
710 new_state = CAN_STATE_ERROR_WARNING;
711 } else if ((priv->can.state > CAN_STATE_ERROR_ACTIVE) &&
712 ((txerr < 96) && (rxerr < 96))) {
713 cf->can_id |= CAN_ERR_PROT;
714 cf->data[2] = CAN_ERR_PROT_ACTIVE;
715
716 new_state = CAN_STATE_ERROR_ACTIVE;
717 }
718 }
719
720 if (!status) {
721 cf->can_id |= CAN_ERR_PROT;
722 cf->data[2] = CAN_ERR_PROT_ACTIVE;
723
724 new_state = CAN_STATE_ERROR_ACTIVE;
725 }
726
727 if (priv->can.restart_ms &&
728 (priv->can.state >= CAN_STATE_BUS_OFF) &&
729 (new_state < CAN_STATE_BUS_OFF)) {
730 cf->can_id |= CAN_ERR_RESTARTED;
731 netif_carrier_on(priv->netdev);
732
733 priv->can.can_stats.restarts++;
734 }
735
736 if (error_factor) {
737 priv->can.can_stats.bus_error++;
738 stats->rx_errors++;
739
740 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
741
742 if (error_factor & M16C_EF_ACKE)
743 cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
744 if (error_factor & M16C_EF_CRCE)
745 cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
746 CAN_ERR_PROT_LOC_CRC_DEL);
747 if (error_factor & M16C_EF_FORME)
748 cf->data[2] |= CAN_ERR_PROT_FORM;
749 if (error_factor & M16C_EF_STFE)
750 cf->data[2] |= CAN_ERR_PROT_STUFF;
751 if (error_factor & M16C_EF_BITE0)
752 cf->data[2] |= CAN_ERR_PROT_BIT0;
753 if (error_factor & M16C_EF_BITE1)
754 cf->data[2] |= CAN_ERR_PROT_BIT1;
755 if (error_factor & M16C_EF_TRE)
756 cf->data[2] |= CAN_ERR_PROT_TX;
757 }
758
759 cf->data[6] = txerr;
760 cf->data[7] = rxerr;
761
762 priv->bec.txerr = txerr;
763 priv->bec.rxerr = rxerr;
764
765 priv->can.state = new_state;
766
767 stats->rx_packets++;
768 stats->rx_bytes += cf->can_dlc;
769 netif_rx(skb);
770 }
771
772 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
773 const struct kvaser_msg *msg)
774 {
775 struct can_frame *cf;
776 struct sk_buff *skb;
777 struct net_device_stats *stats = &priv->netdev->stats;
778
779 if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
780 MSG_FLAG_NERR)) {
781 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
782 msg->u.rx_can.flag);
783
784 stats->rx_errors++;
785 return;
786 }
787
788 if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) {
789 skb = alloc_can_err_skb(priv->netdev, &cf);
790 if (!skb) {
791 stats->rx_dropped++;
792 return;
793 }
794
795 cf->can_id |= CAN_ERR_CRTL;
796 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
797
798 stats->rx_over_errors++;
799 stats->rx_errors++;
800
801 stats->rx_packets++;
802 stats->rx_bytes += cf->can_dlc;
803 netif_rx(skb);
804 }
805 }
806
807 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
808 const struct kvaser_msg *msg)
809 {
810 struct kvaser_usb_net_priv *priv;
811 struct can_frame *cf;
812 struct sk_buff *skb;
813 struct net_device_stats *stats;
814 u8 channel = msg->u.rx_can.channel;
815
816 if (channel >= dev->nchannels) {
817 dev_err(dev->udev->dev.parent,
818 "Invalid channel number (%d)\n", channel);
819 return;
820 }
821
822 priv = dev->nets[channel];
823 stats = &priv->netdev->stats;
824
825 if ((msg->u.rx_can.flag & MSG_FLAG_ERROR_FRAME) &&
826 (msg->id == CMD_LOG_MESSAGE)) {
827 kvaser_usb_rx_error(dev, msg);
828 return;
829 } else if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
830 MSG_FLAG_NERR |
831 MSG_FLAG_OVERRUN)) {
832 kvaser_usb_rx_can_err(priv, msg);
833 return;
834 } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) {
835 netdev_warn(priv->netdev,
836 "Unhandled frame (flags: 0x%02x)",
837 msg->u.rx_can.flag);
838 return;
839 }
840
841 skb = alloc_can_skb(priv->netdev, &cf);
842 if (!skb) {
843 stats->tx_dropped++;
844 return;
845 }
846
847 if (msg->id == CMD_LOG_MESSAGE) {
848 cf->can_id = le32_to_cpu(msg->u.log_message.id);
849 if (cf->can_id & KVASER_EXTENDED_FRAME)
850 cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
851 else
852 cf->can_id &= CAN_SFF_MASK;
853
854 cf->can_dlc = get_can_dlc(msg->u.log_message.dlc);
855
856 if (msg->u.log_message.flags & MSG_FLAG_REMOTE_FRAME)
857 cf->can_id |= CAN_RTR_FLAG;
858 else
859 memcpy(cf->data, &msg->u.log_message.data,
860 cf->can_dlc);
861 } else {
862 cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) |
863 (msg->u.rx_can.msg[1] & 0x3f);
864
865 if (msg->id == CMD_RX_EXT_MESSAGE) {
866 cf->can_id <<= 18;
867 cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) |
868 ((msg->u.rx_can.msg[3] & 0xff) << 6) |
869 (msg->u.rx_can.msg[4] & 0x3f);
870 cf->can_id |= CAN_EFF_FLAG;
871 }
872
873 cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]);
874
875 if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME)
876 cf->can_id |= CAN_RTR_FLAG;
877 else
878 memcpy(cf->data, &msg->u.rx_can.msg[6],
879 cf->can_dlc);
880 }
881
882 stats->rx_packets++;
883 stats->rx_bytes += cf->can_dlc;
884 netif_rx(skb);
885 }
886
887 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
888 const struct kvaser_msg *msg)
889 {
890 struct kvaser_usb_net_priv *priv;
891 u8 channel = msg->u.simple.channel;
892
893 if (channel >= dev->nchannels) {
894 dev_err(dev->udev->dev.parent,
895 "Invalid channel number (%d)\n", channel);
896 return;
897 }
898
899 priv = dev->nets[channel];
900
901 if (completion_done(&priv->start_comp) &&
902 netif_queue_stopped(priv->netdev)) {
903 netif_wake_queue(priv->netdev);
904 } else {
905 netif_start_queue(priv->netdev);
906 complete(&priv->start_comp);
907 }
908 }
909
910 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
911 const struct kvaser_msg *msg)
912 {
913 struct kvaser_usb_net_priv *priv;
914 u8 channel = msg->u.simple.channel;
915
916 if (channel >= dev->nchannels) {
917 dev_err(dev->udev->dev.parent,
918 "Invalid channel number (%d)\n", channel);
919 return;
920 }
921
922 priv = dev->nets[channel];
923
924 complete(&priv->stop_comp);
925 }
926
927 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
928 const struct kvaser_msg *msg)
929 {
930 switch (msg->id) {
931 case CMD_START_CHIP_REPLY:
932 kvaser_usb_start_chip_reply(dev, msg);
933 break;
934
935 case CMD_STOP_CHIP_REPLY:
936 kvaser_usb_stop_chip_reply(dev, msg);
937 break;
938
939 case CMD_RX_STD_MESSAGE:
940 case CMD_RX_EXT_MESSAGE:
941 case CMD_LOG_MESSAGE:
942 kvaser_usb_rx_can_msg(dev, msg);
943 break;
944
945 case CMD_CHIP_STATE_EVENT:
946 case CMD_CAN_ERROR_EVENT:
947 kvaser_usb_rx_error(dev, msg);
948 break;
949
950 case CMD_TX_ACKNOWLEDGE:
951 kvaser_usb_tx_acknowledge(dev, msg);
952 break;
953
954 default:
955 dev_warn(dev->udev->dev.parent,
956 "Unhandled message (%d)\n", msg->id);
957 break;
958 }
959 }
960
961 static void kvaser_usb_read_bulk_callback(struct urb *urb)
962 {
963 struct kvaser_usb *dev = urb->context;
964 struct kvaser_msg *msg;
965 int pos = 0;
966 int err, i;
967
968 switch (urb->status) {
969 case 0:
970 break;
971 case -ENOENT:
972 case -ESHUTDOWN:
973 return;
974 default:
975 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
976 urb->status);
977 goto resubmit_urb;
978 }
979
980 while (pos <= urb->actual_length - MSG_HEADER_LEN) {
981 msg = urb->transfer_buffer + pos;
982
983 if (!msg->len)
984 break;
985
986 if (pos + msg->len > urb->actual_length) {
987 dev_err(dev->udev->dev.parent, "Format error\n");
988 break;
989 }
990
991 kvaser_usb_handle_message(dev, msg);
992
993 pos += msg->len;
994 }
995
996 resubmit_urb:
997 usb_fill_bulk_urb(urb, dev->udev,
998 usb_rcvbulkpipe(dev->udev,
999 dev->bulk_in->bEndpointAddress),
1000 urb->transfer_buffer, RX_BUFFER_SIZE,
1001 kvaser_usb_read_bulk_callback, dev);
1002
1003 err = usb_submit_urb(urb, GFP_ATOMIC);
1004 if (err == -ENODEV) {
1005 for (i = 0; i < dev->nchannels; i++) {
1006 if (!dev->nets[i])
1007 continue;
1008
1009 netif_device_detach(dev->nets[i]->netdev);
1010 }
1011 } else if (err) {
1012 dev_err(dev->udev->dev.parent,
1013 "Failed resubmitting read bulk urb: %d\n", err);
1014 }
1015
1016 return;
1017 }
1018
1019 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1020 {
1021 int i, err = 0;
1022
1023 if (dev->rxinitdone)
1024 return 0;
1025
1026 for (i = 0; i < MAX_RX_URBS; i++) {
1027 struct urb *urb = NULL;
1028 u8 *buf = NULL;
1029 dma_addr_t buf_dma;
1030
1031 urb = usb_alloc_urb(0, GFP_KERNEL);
1032 if (!urb) {
1033 dev_warn(dev->udev->dev.parent,
1034 "No memory left for URBs\n");
1035 err = -ENOMEM;
1036 break;
1037 }
1038
1039 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1040 GFP_KERNEL, &buf_dma);
1041 if (!buf) {
1042 dev_warn(dev->udev->dev.parent,
1043 "No memory left for USB buffer\n");
1044 usb_free_urb(urb);
1045 err = -ENOMEM;
1046 break;
1047 }
1048
1049 usb_fill_bulk_urb(urb, dev->udev,
1050 usb_rcvbulkpipe(dev->udev,
1051 dev->bulk_in->bEndpointAddress),
1052 buf, RX_BUFFER_SIZE,
1053 kvaser_usb_read_bulk_callback,
1054 dev);
1055 urb->transfer_dma = buf_dma;
1056 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1057 usb_anchor_urb(urb, &dev->rx_submitted);
1058
1059 err = usb_submit_urb(urb, GFP_KERNEL);
1060 if (err) {
1061 usb_unanchor_urb(urb);
1062 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1063 buf_dma);
1064 usb_free_urb(urb);
1065 break;
1066 }
1067
1068 dev->rxbuf[i] = buf;
1069 dev->rxbuf_dma[i] = buf_dma;
1070
1071 usb_free_urb(urb);
1072 }
1073
1074 if (i == 0) {
1075 dev_warn(dev->udev->dev.parent,
1076 "Cannot setup read URBs, error %d\n", err);
1077 return err;
1078 } else if (i < MAX_RX_URBS) {
1079 dev_warn(dev->udev->dev.parent,
1080 "RX performances may be slow\n");
1081 }
1082
1083 dev->rxinitdone = true;
1084
1085 return 0;
1086 }
1087
1088 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1089 {
1090 struct kvaser_msg *msg;
1091 int rc;
1092
1093 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1094 if (!msg)
1095 return -ENOMEM;
1096
1097 msg->id = CMD_SET_CTRL_MODE;
1098 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1099 msg->u.ctrl_mode.tid = 0xff;
1100 msg->u.ctrl_mode.channel = priv->channel;
1101
1102 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1103 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1104 else
1105 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1106
1107 rc = kvaser_usb_send_msg(priv->dev, msg);
1108
1109 kfree(msg);
1110 return rc;
1111 }
1112
1113 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1114 {
1115 int err;
1116
1117 init_completion(&priv->start_comp);
1118
1119 err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1120 priv->channel);
1121 if (err)
1122 return err;
1123
1124 if (!wait_for_completion_timeout(&priv->start_comp,
1125 msecs_to_jiffies(START_TIMEOUT)))
1126 return -ETIMEDOUT;
1127
1128 return 0;
1129 }
1130
1131 static int kvaser_usb_open(struct net_device *netdev)
1132 {
1133 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1134 struct kvaser_usb *dev = priv->dev;
1135 int err;
1136
1137 err = open_candev(netdev);
1138 if (err)
1139 return err;
1140
1141 err = kvaser_usb_setup_rx_urbs(dev);
1142 if (err)
1143 goto error;
1144
1145 err = kvaser_usb_set_opt_mode(priv);
1146 if (err)
1147 goto error;
1148
1149 err = kvaser_usb_start_chip(priv);
1150 if (err) {
1151 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1152 goto error;
1153 }
1154
1155 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1156
1157 return 0;
1158
1159 error:
1160 close_candev(netdev);
1161 return err;
1162 }
1163
1164 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1165 {
1166 int i;
1167
1168 usb_kill_anchored_urbs(&dev->rx_submitted);
1169
1170 for (i = 0; i < MAX_RX_URBS; i++)
1171 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1172 dev->rxbuf[i],
1173 dev->rxbuf_dma[i]);
1174
1175 for (i = 0; i < MAX_NET_DEVICES; i++) {
1176 struct kvaser_usb_net_priv *priv = dev->nets[i];
1177
1178 if (priv)
1179 kvaser_usb_unlink_tx_urbs(priv);
1180 }
1181 }
1182
1183 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1184 {
1185 int err;
1186
1187 init_completion(&priv->stop_comp);
1188
1189 err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1190 priv->channel);
1191 if (err)
1192 return err;
1193
1194 if (!wait_for_completion_timeout(&priv->stop_comp,
1195 msecs_to_jiffies(STOP_TIMEOUT)))
1196 return -ETIMEDOUT;
1197
1198 return 0;
1199 }
1200
1201 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1202 {
1203 struct kvaser_msg *msg;
1204 int rc;
1205
1206 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1207 if (!msg)
1208 return -ENOMEM;
1209
1210 msg->id = CMD_FLUSH_QUEUE;
1211 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1212 msg->u.flush_queue.channel = priv->channel;
1213 msg->u.flush_queue.flags = 0x00;
1214
1215 rc = kvaser_usb_send_msg(priv->dev, msg);
1216
1217 kfree(msg);
1218 return rc;
1219 }
1220
1221 static int kvaser_usb_close(struct net_device *netdev)
1222 {
1223 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1224 struct kvaser_usb *dev = priv->dev;
1225 int err;
1226
1227 netif_stop_queue(netdev);
1228
1229 err = kvaser_usb_flush_queue(priv);
1230 if (err)
1231 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1232
1233 if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1234 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1235
1236 err = kvaser_usb_stop_chip(priv);
1237 if (err)
1238 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1239
1240 /* reset tx contexts */
1241 kvaser_usb_unlink_tx_urbs(priv);
1242
1243 priv->can.state = CAN_STATE_STOPPED;
1244 close_candev(priv->netdev);
1245
1246 return 0;
1247 }
1248
1249 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1250 {
1251 struct kvaser_usb_tx_urb_context *context = urb->context;
1252 struct kvaser_usb_net_priv *priv;
1253 struct net_device *netdev;
1254
1255 if (WARN_ON(!context))
1256 return;
1257
1258 priv = context->priv;
1259 netdev = priv->netdev;
1260
1261 kfree(urb->transfer_buffer);
1262
1263 if (!netif_device_present(netdev))
1264 return;
1265
1266 if (urb->status)
1267 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1268 }
1269
1270 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1271 struct net_device *netdev)
1272 {
1273 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1274 struct kvaser_usb *dev = priv->dev;
1275 struct net_device_stats *stats = &netdev->stats;
1276 struct can_frame *cf = (struct can_frame *)skb->data;
1277 struct kvaser_usb_tx_urb_context *context = NULL;
1278 struct urb *urb;
1279 void *buf;
1280 struct kvaser_msg *msg;
1281 int i, err;
1282 int ret = NETDEV_TX_OK;
1283
1284 if (can_dropped_invalid_skb(netdev, skb))
1285 return NETDEV_TX_OK;
1286
1287 urb = usb_alloc_urb(0, GFP_ATOMIC);
1288 if (!urb) {
1289 netdev_err(netdev, "No memory left for URBs\n");
1290 stats->tx_dropped++;
1291 dev_kfree_skb(skb);
1292 return NETDEV_TX_OK;
1293 }
1294
1295 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1296 if (!buf) {
1297 stats->tx_dropped++;
1298 dev_kfree_skb(skb);
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 /* This should never happen; it implies a flow control bug */
1334 if (!context) {
1335 netdev_warn(netdev, "cannot find free context\n");
1336 ret = NETDEV_TX_BUSY;
1337 goto releasebuf;
1338 }
1339
1340 context->priv = priv;
1341 context->echo_index = i;
1342 context->dlc = cf->can_dlc;
1343
1344 msg->u.tx_can.tid = context->echo_index;
1345
1346 usb_fill_bulk_urb(urb, dev->udev,
1347 usb_sndbulkpipe(dev->udev,
1348 dev->bulk_out->bEndpointAddress),
1349 buf, msg->len,
1350 kvaser_usb_write_bulk_callback, context);
1351 usb_anchor_urb(urb, &priv->tx_submitted);
1352
1353 can_put_echo_skb(skb, netdev, context->echo_index);
1354
1355 atomic_inc(&priv->active_tx_urbs);
1356
1357 if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
1358 netif_stop_queue(netdev);
1359
1360 err = usb_submit_urb(urb, GFP_ATOMIC);
1361 if (unlikely(err)) {
1362 can_free_echo_skb(netdev, context->echo_index);
1363
1364 atomic_dec(&priv->active_tx_urbs);
1365 usb_unanchor_urb(urb);
1366
1367 stats->tx_dropped++;
1368
1369 if (err == -ENODEV)
1370 netif_device_detach(netdev);
1371 else
1372 netdev_warn(netdev, "Failed tx_urb %d\n", err);
1373
1374 goto releasebuf;
1375 }
1376
1377 usb_free_urb(urb);
1378
1379 return NETDEV_TX_OK;
1380
1381 releasebuf:
1382 kfree(buf);
1383 nobufmem:
1384 usb_free_urb(urb);
1385 return ret;
1386 }
1387
1388 static const struct net_device_ops kvaser_usb_netdev_ops = {
1389 .ndo_open = kvaser_usb_open,
1390 .ndo_stop = kvaser_usb_close,
1391 .ndo_start_xmit = kvaser_usb_start_xmit,
1392 .ndo_change_mtu = can_change_mtu,
1393 };
1394
1395 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1396 .name = "kvaser_usb",
1397 .tseg1_min = KVASER_USB_TSEG1_MIN,
1398 .tseg1_max = KVASER_USB_TSEG1_MAX,
1399 .tseg2_min = KVASER_USB_TSEG2_MIN,
1400 .tseg2_max = KVASER_USB_TSEG2_MAX,
1401 .sjw_max = KVASER_USB_SJW_MAX,
1402 .brp_min = KVASER_USB_BRP_MIN,
1403 .brp_max = KVASER_USB_BRP_MAX,
1404 .brp_inc = KVASER_USB_BRP_INC,
1405 };
1406
1407 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1408 {
1409 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1410 struct can_bittiming *bt = &priv->can.bittiming;
1411 struct kvaser_usb *dev = priv->dev;
1412 struct kvaser_msg *msg;
1413 int rc;
1414
1415 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1416 if (!msg)
1417 return -ENOMEM;
1418
1419 msg->id = CMD_SET_BUS_PARAMS;
1420 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1421 msg->u.busparams.channel = priv->channel;
1422 msg->u.busparams.tid = 0xff;
1423 msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1424 msg->u.busparams.sjw = bt->sjw;
1425 msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1426 msg->u.busparams.tseg2 = bt->phase_seg2;
1427
1428 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1429 msg->u.busparams.no_samp = 3;
1430 else
1431 msg->u.busparams.no_samp = 1;
1432
1433 rc = kvaser_usb_send_msg(dev, msg);
1434
1435 kfree(msg);
1436 return rc;
1437 }
1438
1439 static int kvaser_usb_set_mode(struct net_device *netdev,
1440 enum can_mode mode)
1441 {
1442 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1443 int err;
1444
1445 switch (mode) {
1446 case CAN_MODE_START:
1447 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1448 if (err)
1449 return err;
1450 break;
1451 default:
1452 return -EOPNOTSUPP;
1453 }
1454
1455 return 0;
1456 }
1457
1458 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1459 struct can_berr_counter *bec)
1460 {
1461 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1462
1463 *bec = priv->bec;
1464
1465 return 0;
1466 }
1467
1468 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1469 {
1470 int i;
1471
1472 for (i = 0; i < dev->nchannels; i++) {
1473 if (!dev->nets[i])
1474 continue;
1475
1476 unregister_netdev(dev->nets[i]->netdev);
1477 }
1478
1479 kvaser_usb_unlink_all_urbs(dev);
1480
1481 for (i = 0; i < dev->nchannels; i++) {
1482 if (!dev->nets[i])
1483 continue;
1484
1485 free_candev(dev->nets[i]->netdev);
1486 }
1487 }
1488
1489 static int kvaser_usb_init_one(struct usb_interface *intf,
1490 const struct usb_device_id *id, int channel)
1491 {
1492 struct kvaser_usb *dev = usb_get_intfdata(intf);
1493 struct net_device *netdev;
1494 struct kvaser_usb_net_priv *priv;
1495 int i, err;
1496
1497 err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1498 if (err)
1499 return 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, retry = 3;
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 /* On some x86 laptops, plugging a Kvaser device again after
1606 * an unplug makes the firmware always ignore the very first
1607 * command. For such a case, provide some room for retries
1608 * instead of completely exiting the driver.
1609 */
1610 do {
1611 err = kvaser_usb_get_software_info(dev);
1612 } while (--retry && err == -ETIMEDOUT);
1613
1614 if (err) {
1615 dev_err(&intf->dev,
1616 "Cannot get software infos, error %d\n", err);
1617 return err;
1618 }
1619
1620 err = kvaser_usb_get_card_info(dev);
1621 if (err) {
1622 dev_err(&intf->dev,
1623 "Cannot get card infos, error %d\n", err);
1624 return err;
1625 }
1626
1627 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
1628 ((dev->fw_version >> 24) & 0xff),
1629 ((dev->fw_version >> 16) & 0xff),
1630 (dev->fw_version & 0xffff));
1631
1632 for (i = 0; i < dev->nchannels; i++) {
1633 err = kvaser_usb_init_one(intf, id, i);
1634 if (err) {
1635 kvaser_usb_remove_interfaces(dev);
1636 return err;
1637 }
1638 }
1639
1640 return 0;
1641 }
1642
1643 static void kvaser_usb_disconnect(struct usb_interface *intf)
1644 {
1645 struct kvaser_usb *dev = usb_get_intfdata(intf);
1646
1647 usb_set_intfdata(intf, NULL);
1648
1649 if (!dev)
1650 return;
1651
1652 kvaser_usb_remove_interfaces(dev);
1653 }
1654
1655 static struct usb_driver kvaser_usb_driver = {
1656 .name = "kvaser_usb",
1657 .probe = kvaser_usb_probe,
1658 .disconnect = kvaser_usb_disconnect,
1659 .id_table = kvaser_usb_table,
1660 };
1661
1662 module_usb_driver(kvaser_usb_driver);
1663
1664 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
1665 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
1666 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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