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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
141struct kvaser_msg_simple {
142 u8 tid;
143 u8 channel;
144} __packed;
145
146struct 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
159struct kvaser_msg_cardinfo2 {
160 u8 tid;
161 u8 channel;
162 u8 pcb_id[24];
163 __le32 oem_unlock_code;
164} __packed;
165
166struct 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
175struct 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
185struct kvaser_msg_tx_can {
186 u8 channel;
187 u8 tid;
188 u8 msg[14];
189 u8 padding;
190 u8 flags;
191} __packed;
192
193struct kvaser_msg_rx_can {
194 u8 channel;
195 u8 flag;
196 __le16 time[3];
197 u8 msg[14];
198} __packed;
199
200struct 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
210struct kvaser_msg_tx_acknowledge {
211 u8 channel;
212 u8 tid;
213 __le16 time[3];
214 u8 flags;
215 u8 time_offset;
216} __packed;
217
218struct 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
230struct kvaser_msg_ctrl_mode {
231 u8 tid;
232 u8 channel;
233 u8 ctrl_mode;
234 u8 padding[3];
235} __packed;
236
237struct kvaser_msg_flush_queue {
238 u8 tid;
239 u8 channel;
240 u8 flags;
241 u8 padding[3];
242} __packed;
243
244struct 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
254struct 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
274struct kvaser_usb_tx_urb_context {
275 struct kvaser_usb_net_priv *priv;
276 u32 echo_index;
277 int dlc;
278};
279
280struct 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
295struct 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
311static 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};
361MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
362
363static 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
375static 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 = 0;
383
384 buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
385 if (!buf)
386 return -ENOMEM;
387
388 err = usb_bulk_msg(dev->udev,
389 usb_rcvbulkpipe(dev->udev,
390 dev->bulk_in->bEndpointAddress),
391 buf, RX_BUFFER_SIZE, &actual_len,
392 USB_RECV_TIMEOUT);
393 if (err < 0)
394 goto end;
395
396 while (pos <= actual_len - MSG_HEADER_LEN) {
397 tmp = buf + pos;
398
399 if (!tmp->len)
400 break;
401
402 if (pos + tmp->len > actual_len) {
403 dev_err(dev->udev->dev.parent, "Format error\n");
404 break;
405 }
406
407 if (tmp->id == id) {
408 memcpy(msg, tmp, tmp->len);
409 goto end;
410 }
411
412 pos += tmp->len;
413 }
414
415 err = -EINVAL;
416
417end:
418 kfree(buf);
419
420 return err;
421}
422
423static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
424 u8 msg_id, int channel)
425{
426 struct kvaser_msg *msg;
427 int rc;
428
429 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
430 if (!msg)
431 return -ENOMEM;
432
433 msg->id = msg_id;
434 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
435 msg->u.simple.channel = channel;
436 msg->u.simple.tid = 0xff;
437
438 rc = kvaser_usb_send_msg(dev, msg);
439
440 kfree(msg);
441 return rc;
442}
443
444static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
445{
446 struct kvaser_msg msg;
447 int err;
448
449 err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
450 if (err)
451 return err;
452
453 err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
454 if (err)
455 return err;
456
457 dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version);
458
459 return 0;
460}
461
462static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
463{
464 struct kvaser_msg msg;
465 int err;
466
467 err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
468 if (err)
469 return err;
470
471 err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
472 if (err)
473 return err;
474
475 dev->nchannels = msg.u.cardinfo.nchannels;
476 if (dev->nchannels > MAX_NET_DEVICES)
477 return -EINVAL;
478
479 return 0;
480}
481
482static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
483 const struct kvaser_msg *msg)
484{
485 struct net_device_stats *stats;
486 struct kvaser_usb_tx_urb_context *context;
487 struct kvaser_usb_net_priv *priv;
488 struct sk_buff *skb;
489 struct can_frame *cf;
490 u8 channel = msg->u.tx_acknowledge.channel;
491 u8 tid = msg->u.tx_acknowledge.tid;
492
493 if (channel >= dev->nchannels) {
494 dev_err(dev->udev->dev.parent,
495 "Invalid channel number (%d)\n", channel);
496 return;
497 }
498
499 priv = dev->nets[channel];
500
501 if (!netif_device_present(priv->netdev))
502 return;
503
504 stats = &priv->netdev->stats;
505
506 context = &priv->tx_contexts[tid % MAX_TX_URBS];
507
508 /* Sometimes the state change doesn't come after a bus-off event */
509 if (priv->can.restart_ms &&
510 (priv->can.state >= CAN_STATE_BUS_OFF)) {
511 skb = alloc_can_err_skb(priv->netdev, &cf);
512 if (skb) {
513 cf->can_id |= CAN_ERR_RESTARTED;
514 netif_rx(skb);
515
516 stats->rx_packets++;
517 stats->rx_bytes += cf->can_dlc;
518 } else {
519 netdev_err(priv->netdev,
520 "No memory left for err_skb\n");
521 }
522
523 priv->can.can_stats.restarts++;
524 netif_carrier_on(priv->netdev);
525
526 priv->can.state = CAN_STATE_ERROR_ACTIVE;
527 }
528
529 stats->tx_packets++;
530 stats->tx_bytes += context->dlc;
531 can_get_echo_skb(priv->netdev, context->echo_index);
532
533 context->echo_index = MAX_TX_URBS;
534 atomic_dec(&priv->active_tx_urbs);
535
536 netif_wake_queue(priv->netdev);
537}
538
539static void kvaser_usb_simple_msg_callback(struct urb *urb)
540{
541 struct net_device *netdev = urb->context;
542
543 kfree(urb->transfer_buffer);
544
545 if (urb->status)
546 netdev_warn(netdev, "urb status received: %d\n",
547 urb->status);
548}
549
550static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
551 u8 msg_id)
552{
553 struct kvaser_usb *dev = priv->dev;
554 struct net_device *netdev = priv->netdev;
555 struct kvaser_msg *msg;
556 struct urb *urb;
557 void *buf;
558 int err;
559
560 urb = usb_alloc_urb(0, GFP_ATOMIC);
561 if (!urb) {
562 netdev_err(netdev, "No memory left for URBs\n");
563 return -ENOMEM;
564 }
565
566 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
567 if (!buf) {
568 usb_free_urb(urb);
569 return -ENOMEM;
570 }
571
572 msg = (struct kvaser_msg *)buf;
573 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
574 msg->id = msg_id;
575 msg->u.simple.channel = priv->channel;
576
577 usb_fill_bulk_urb(urb, dev->udev,
578 usb_sndbulkpipe(dev->udev,
579 dev->bulk_out->bEndpointAddress),
580 buf, msg->len,
581 kvaser_usb_simple_msg_callback, priv);
582 usb_anchor_urb(urb, &priv->tx_submitted);
583
584 err = usb_submit_urb(urb, GFP_ATOMIC);
585 if (err) {
586 netdev_err(netdev, "Error transmitting URB\n");
587 usb_unanchor_urb(urb);
588 usb_free_urb(urb);
589 kfree(buf);
590 return err;
591 }
592
593 usb_free_urb(urb);
594
595 return 0;
596}
597
598static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
599{
600 int i;
601
602 usb_kill_anchored_urbs(&priv->tx_submitted);
603 atomic_set(&priv->active_tx_urbs, 0);
604
605 for (i = 0; i < MAX_TX_URBS; i++)
606 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
607}
608
609static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
610 const struct kvaser_msg *msg)
611{
612 struct can_frame *cf;
613 struct sk_buff *skb;
614 struct net_device_stats *stats;
615 struct kvaser_usb_net_priv *priv;
616 unsigned int new_state;
617 u8 channel, status, txerr, rxerr, error_factor;
618
619 switch (msg->id) {
620 case CMD_CAN_ERROR_EVENT:
621 channel = msg->u.error_event.channel;
622 status = msg->u.error_event.status;
623 txerr = msg->u.error_event.tx_errors_count;
624 rxerr = msg->u.error_event.rx_errors_count;
625 error_factor = msg->u.error_event.error_factor;
626 break;
627 case CMD_LOG_MESSAGE:
628 channel = msg->u.log_message.channel;
629 status = msg->u.log_message.data[0];
630 txerr = msg->u.log_message.data[2];
631 rxerr = msg->u.log_message.data[3];
632 error_factor = msg->u.log_message.data[1];
633 break;
634 case CMD_CHIP_STATE_EVENT:
635 channel = msg->u.chip_state_event.channel;
636 status = msg->u.chip_state_event.status;
637 txerr = msg->u.chip_state_event.tx_errors_count;
638 rxerr = msg->u.chip_state_event.rx_errors_count;
639 error_factor = 0;
640 break;
641 default:
642 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
643 msg->id);
644 return;
645 }
646
647 if (channel >= dev->nchannels) {
648 dev_err(dev->udev->dev.parent,
649 "Invalid channel number (%d)\n", channel);
650 return;
651 }
652
653 priv = dev->nets[channel];
654 stats = &priv->netdev->stats;
655
656 if (status & M16C_STATE_BUS_RESET) {
657 kvaser_usb_unlink_tx_urbs(priv);
658 return;
659 }
660
661 skb = alloc_can_err_skb(priv->netdev, &cf);
662 if (!skb) {
663 stats->rx_dropped++;
664 return;
665 }
666
667 new_state = priv->can.state;
668
669 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status);
670
671 if (status & M16C_STATE_BUS_OFF) {
672 cf->can_id |= CAN_ERR_BUSOFF;
673
674 priv->can.can_stats.bus_off++;
675 if (!priv->can.restart_ms)
676 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
677
678 netif_carrier_off(priv->netdev);
679
680 new_state = CAN_STATE_BUS_OFF;
681 } else if (status & M16C_STATE_BUS_PASSIVE) {
682 if (priv->can.state != CAN_STATE_ERROR_PASSIVE) {
683 cf->can_id |= CAN_ERR_CRTL;
684
685 if (txerr || rxerr)
686 cf->data[1] = (txerr > rxerr)
687 ? CAN_ERR_CRTL_TX_PASSIVE
688 : CAN_ERR_CRTL_RX_PASSIVE;
689 else
690 cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE |
691 CAN_ERR_CRTL_RX_PASSIVE;
692
693 priv->can.can_stats.error_passive++;
694 }
695
696 new_state = CAN_STATE_ERROR_PASSIVE;
697 }
698
699 if (status == M16C_STATE_BUS_ERROR) {
700 if ((priv->can.state < CAN_STATE_ERROR_WARNING) &&
701 ((txerr >= 96) || (rxerr >= 96))) {
702 cf->can_id |= CAN_ERR_CRTL;
703 cf->data[1] = (txerr > rxerr)
704 ? CAN_ERR_CRTL_TX_WARNING
705 : CAN_ERR_CRTL_RX_WARNING;
706
707 priv->can.can_stats.error_warning++;
708 new_state = CAN_STATE_ERROR_WARNING;
709 } else if (priv->can.state > CAN_STATE_ERROR_ACTIVE) {
710 cf->can_id |= CAN_ERR_PROT;
711 cf->data[2] = CAN_ERR_PROT_ACTIVE;
712
713 new_state = CAN_STATE_ERROR_ACTIVE;
714 }
715 }
716
717 if (!status) {
718 cf->can_id |= CAN_ERR_PROT;
719 cf->data[2] = CAN_ERR_PROT_ACTIVE;
720
721 new_state = CAN_STATE_ERROR_ACTIVE;
722 }
723
724 if (priv->can.restart_ms &&
725 (priv->can.state >= CAN_STATE_BUS_OFF) &&
726 (new_state < CAN_STATE_BUS_OFF)) {
727 cf->can_id |= CAN_ERR_RESTARTED;
728 netif_carrier_on(priv->netdev);
729
730 priv->can.can_stats.restarts++;
731 }
732
733 if (error_factor) {
734 priv->can.can_stats.bus_error++;
735 stats->rx_errors++;
736
737 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
738
739 if (error_factor & M16C_EF_ACKE)
740 cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
741 if (error_factor & M16C_EF_CRCE)
742 cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
743 CAN_ERR_PROT_LOC_CRC_DEL);
744 if (error_factor & M16C_EF_FORME)
745 cf->data[2] |= CAN_ERR_PROT_FORM;
746 if (error_factor & M16C_EF_STFE)
747 cf->data[2] |= CAN_ERR_PROT_STUFF;
748 if (error_factor & M16C_EF_BITE0)
749 cf->data[2] |= CAN_ERR_PROT_BIT0;
750 if (error_factor & M16C_EF_BITE1)
751 cf->data[2] |= CAN_ERR_PROT_BIT1;
752 if (error_factor & M16C_EF_TRE)
753 cf->data[2] |= CAN_ERR_PROT_TX;
754 }
755
756 cf->data[6] = txerr;
757 cf->data[7] = rxerr;
758
759 priv->bec.txerr = txerr;
760 priv->bec.rxerr = rxerr;
761
762 priv->can.state = new_state;
763
764 netif_rx(skb);
765
766 stats->rx_packets++;
767 stats->rx_bytes += cf->can_dlc;
768}
769
770static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
771 const struct kvaser_msg *msg)
772{
773 struct can_frame *cf;
774 struct sk_buff *skb;
775 struct net_device_stats *stats = &priv->netdev->stats;
776
777 if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
778 MSG_FLAG_NERR)) {
779 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
780 msg->u.rx_can.flag);
781
782 stats->rx_errors++;
783 return;
784 }
785
786 if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) {
787 skb = alloc_can_err_skb(priv->netdev, &cf);
788 if (!skb) {
789 stats->rx_dropped++;
790 return;
791 }
792
793 cf->can_id |= CAN_ERR_CRTL;
794 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
795
796 stats->rx_over_errors++;
797 stats->rx_errors++;
798
799 netif_rx(skb);
800
801 stats->rx_packets++;
802 stats->rx_bytes += cf->can_dlc;
803 }
804}
805
806static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
807 const struct kvaser_msg *msg)
808{
809 struct kvaser_usb_net_priv *priv;
810 struct can_frame *cf;
811 struct sk_buff *skb;
812 struct net_device_stats *stats;
813 u8 channel = msg->u.rx_can.channel;
814
815 if (channel >= dev->nchannels) {
816 dev_err(dev->udev->dev.parent,
817 "Invalid channel number (%d)\n", channel);
818 return;
819 }
820
821 priv = dev->nets[channel];
822 stats = &priv->netdev->stats;
823
824 if ((msg->u.rx_can.flag & MSG_FLAG_ERROR_FRAME) &&
825 (msg->id == CMD_LOG_MESSAGE)) {
826 kvaser_usb_rx_error(dev, msg);
827 return;
828 } else if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
829 MSG_FLAG_NERR |
830 MSG_FLAG_OVERRUN)) {
831 kvaser_usb_rx_can_err(priv, msg);
832 return;
833 } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) {
834 netdev_warn(priv->netdev,
835 "Unhandled frame (flags: 0x%02x)",
836 msg->u.rx_can.flag);
837 return;
838 }
839
840 skb = alloc_can_skb(priv->netdev, &cf);
841 if (!skb) {
842 stats->tx_dropped++;
843 return;
844 }
845
846 if (msg->id == CMD_LOG_MESSAGE) {
847 cf->can_id = le32_to_cpu(msg->u.log_message.id);
848 if (cf->can_id & KVASER_EXTENDED_FRAME)
849 cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
850 else
851 cf->can_id &= CAN_SFF_MASK;
852
853 cf->can_dlc = get_can_dlc(msg->u.log_message.dlc);
854
855 if (msg->u.log_message.flags & MSG_FLAG_REMOTE_FRAME)
856 cf->can_id |= CAN_RTR_FLAG;
857 else
858 memcpy(cf->data, &msg->u.log_message.data,
859 cf->can_dlc);
860 } else {
861 cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) |
862 (msg->u.rx_can.msg[1] & 0x3f);
863
864 if (msg->id == CMD_RX_EXT_MESSAGE) {
865 cf->can_id <<= 18;
866 cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) |
867 ((msg->u.rx_can.msg[3] & 0xff) << 6) |
868 (msg->u.rx_can.msg[4] & 0x3f);
869 cf->can_id |= CAN_EFF_FLAG;
870 }
871
872 cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]);
873
874 if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME)
875 cf->can_id |= CAN_RTR_FLAG;
876 else
877 memcpy(cf->data, &msg->u.rx_can.msg[6],
878 cf->can_dlc);
879 }
880
881 netif_rx(skb);
882
883 stats->rx_packets++;
884 stats->rx_bytes += cf->can_dlc;
885}
886
887static 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
910static 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
927static 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
961static 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
996resubmit_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
1019static 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
1088static 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
1113static 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
1131static 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
1159error:
1160 close_candev(netdev);
1161 return err;
1162}
1163
1164static 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
1183static 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
1201static 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
1221static 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 priv->can.state = CAN_STATE_STOPPED;
1241 close_candev(priv->netdev);
1242
1243 return 0;
1244}
1245
1246static void kvaser_usb_write_bulk_callback(struct urb *urb)
1247{
1248 struct kvaser_usb_tx_urb_context *context = urb->context;
1249 struct kvaser_usb_net_priv *priv;
1250 struct net_device *netdev;
1251
1252 if (WARN_ON(!context))
1253 return;
1254
1255 priv = context->priv;
1256 netdev = priv->netdev;
1257
1258 kfree(urb->transfer_buffer);
1259
1260 if (!netif_device_present(netdev))
1261 return;
1262
1263 if (urb->status)
1264 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1265}
1266
1267static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1268 struct net_device *netdev)
1269{
1270 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1271 struct kvaser_usb *dev = priv->dev;
1272 struct net_device_stats *stats = &netdev->stats;
1273 struct can_frame *cf = (struct can_frame *)skb->data;
1274 struct kvaser_usb_tx_urb_context *context = NULL;
1275 struct urb *urb;
1276 void *buf;
1277 struct kvaser_msg *msg;
1278 int i, err;
1279 int ret = NETDEV_TX_OK;
1280
1281 if (can_dropped_invalid_skb(netdev, skb))
1282 return NETDEV_TX_OK;
1283
1284 urb = usb_alloc_urb(0, GFP_ATOMIC);
1285 if (!urb) {
1286 netdev_err(netdev, "No memory left for URBs\n");
1287 stats->tx_dropped++;
1288 goto nourbmem;
1289 }
1290
1291 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1292 if (!buf) {
1293 stats->tx_dropped++;
1294 goto nobufmem;
1295 }
1296
1297 msg = buf;
1298 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1299 msg->u.tx_can.flags = 0;
1300 msg->u.tx_can.channel = priv->channel;
1301
1302 if (cf->can_id & CAN_EFF_FLAG) {
1303 msg->id = CMD_TX_EXT_MESSAGE;
1304 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1305 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1306 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1307 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1308 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1309 } else {
1310 msg->id = CMD_TX_STD_MESSAGE;
1311 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1312 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1313 }
1314
1315 msg->u.tx_can.msg[5] = cf->can_dlc;
1316 memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1317
1318 if (cf->can_id & CAN_RTR_FLAG)
1319 msg->u.tx_can.flags |= MSG_FLAG_REMOTE_FRAME;
1320
1321 for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1322 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1323 context = &priv->tx_contexts[i];
1324 break;
1325 }
1326 }
1327
1328 if (!context) {
1329 netdev_warn(netdev, "cannot find free context\n");
1330 ret = NETDEV_TX_BUSY;
1331 goto releasebuf;
1332 }
1333
1334 context->priv = priv;
1335 context->echo_index = i;
1336 context->dlc = cf->can_dlc;
1337
1338 msg->u.tx_can.tid = context->echo_index;
1339
1340 usb_fill_bulk_urb(urb, dev->udev,
1341 usb_sndbulkpipe(dev->udev,
1342 dev->bulk_out->bEndpointAddress),
1343 buf, msg->len,
1344 kvaser_usb_write_bulk_callback, context);
1345 usb_anchor_urb(urb, &priv->tx_submitted);
1346
1347 can_put_echo_skb(skb, netdev, context->echo_index);
1348
1349 atomic_inc(&priv->active_tx_urbs);
1350
1351 if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
1352 netif_stop_queue(netdev);
1353
1354 err = usb_submit_urb(urb, GFP_ATOMIC);
1355 if (unlikely(err)) {
1356 can_free_echo_skb(netdev, context->echo_index);
1357
1358 skb = NULL; /* set to NULL to avoid double free in
1359 * dev_kfree_skb(skb) */
1360
1361 atomic_dec(&priv->active_tx_urbs);
1362 usb_unanchor_urb(urb);
1363
1364 stats->tx_dropped++;
1365
1366 if (err == -ENODEV)
1367 netif_device_detach(netdev);
1368 else
1369 netdev_warn(netdev, "Failed tx_urb %d\n", err);
1370
1371 goto releasebuf;
1372 }
1373
1374 usb_free_urb(urb);
1375
1376 return NETDEV_TX_OK;
1377
1378releasebuf:
1379 kfree(buf);
1380nobufmem:
1381 usb_free_urb(urb);
1382nourbmem:
1383 dev_kfree_skb(skb);
1384 return ret;
1385}
1386
1387static const struct net_device_ops kvaser_usb_netdev_ops = {
1388 .ndo_open = kvaser_usb_open,
1389 .ndo_stop = kvaser_usb_close,
1390 .ndo_start_xmit = kvaser_usb_start_xmit,
1391 .ndo_change_mtu = can_change_mtu,
1392};
1393
1394static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1395 .name = "kvaser_usb",
1396 .tseg1_min = KVASER_USB_TSEG1_MIN,
1397 .tseg1_max = KVASER_USB_TSEG1_MAX,
1398 .tseg2_min = KVASER_USB_TSEG2_MIN,
1399 .tseg2_max = KVASER_USB_TSEG2_MAX,
1400 .sjw_max = KVASER_USB_SJW_MAX,
1401 .brp_min = KVASER_USB_BRP_MIN,
1402 .brp_max = KVASER_USB_BRP_MAX,
1403 .brp_inc = KVASER_USB_BRP_INC,
1404};
1405
1406static int kvaser_usb_set_bittiming(struct net_device *netdev)
1407{
1408 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1409 struct can_bittiming *bt = &priv->can.bittiming;
1410 struct kvaser_usb *dev = priv->dev;
1411 struct kvaser_msg *msg;
1412 int rc;
1413
1414 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1415 if (!msg)
1416 return -ENOMEM;
1417
1418 msg->id = CMD_SET_BUS_PARAMS;
1419 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1420 msg->u.busparams.channel = priv->channel;
1421 msg->u.busparams.tid = 0xff;
1422 msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1423 msg->u.busparams.sjw = bt->sjw;
1424 msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1425 msg->u.busparams.tseg2 = bt->phase_seg2;
1426
1427 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1428 msg->u.busparams.no_samp = 3;
1429 else
1430 msg->u.busparams.no_samp = 1;
1431
1432 rc = kvaser_usb_send_msg(dev, msg);
1433
1434 kfree(msg);
1435 return rc;
1436}
1437
1438static int kvaser_usb_set_mode(struct net_device *netdev,
1439 enum can_mode mode)
1440{
1441 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1442 int err;
1443
1444 switch (mode) {
1445 case CAN_MODE_START:
1446 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1447 if (err)
1448 return err;
1449 break;
1450 default:
1451 return -EOPNOTSUPP;
1452 }
1453
1454 return 0;
1455}
1456
1457static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1458 struct can_berr_counter *bec)
1459{
1460 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1461
1462 *bec = priv->bec;
1463
1464 return 0;
1465}
1466
1467static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1468{
1469 int i;
1470
1471 for (i = 0; i < dev->nchannels; i++) {
1472 if (!dev->nets[i])
1473 continue;
1474
1475 unregister_netdev(dev->nets[i]->netdev);
1476 }
1477
1478 kvaser_usb_unlink_all_urbs(dev);
1479
1480 for (i = 0; i < dev->nchannels; i++) {
1481 if (!dev->nets[i])
1482 continue;
1483
1484 free_candev(dev->nets[i]->netdev);
1485 }
1486}
1487
1488static int kvaser_usb_init_one(struct usb_interface *intf,
1489 const struct usb_device_id *id, int channel)
1490{
1491 struct kvaser_usb *dev = usb_get_intfdata(intf);
1492 struct net_device *netdev;
1493 struct kvaser_usb_net_priv *priv;
1494 int i, err;
1495
1496 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1497 if (!netdev) {
1498 dev_err(&intf->dev, "Cannot alloc candev\n");
1499 return -ENOMEM;
1500 }
1501
1502 priv = netdev_priv(netdev);
1503
1504 init_completion(&priv->start_comp);
1505 init_completion(&priv->stop_comp);
1506
1507 init_usb_anchor(&priv->tx_submitted);
1508 atomic_set(&priv->active_tx_urbs, 0);
1509
1510 for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++)
1511 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1512
1513 priv->dev = dev;
1514 priv->netdev = netdev;
1515 priv->channel = channel;
1516
1517 priv->can.state = CAN_STATE_STOPPED;
1518 priv->can.clock.freq = CAN_USB_CLOCK;
1519 priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1520 priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1521 priv->can.do_set_mode = kvaser_usb_set_mode;
1522 if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1523 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1524 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1525 if (id->driver_info & KVASER_HAS_SILENT_MODE)
1526 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1527
1528 netdev->flags |= IFF_ECHO;
1529
1530 netdev->netdev_ops = &kvaser_usb_netdev_ops;
1531
1532 SET_NETDEV_DEV(netdev, &intf->dev);
1533 netdev->dev_id = channel;
1534
1535 dev->nets[channel] = priv;
1536
1537 err = register_candev(netdev);
1538 if (err) {
1539 dev_err(&intf->dev, "Failed to register can device\n");
1540 free_candev(netdev);
1541 dev->nets[channel] = NULL;
1542 return err;
1543 }
1544
1545 netdev_dbg(netdev, "device registered\n");
1546
1547 return 0;
1548}
1549
1550static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1551 struct usb_endpoint_descriptor **in,
1552 struct usb_endpoint_descriptor **out)
1553{
1554 const struct usb_host_interface *iface_desc;
1555 struct usb_endpoint_descriptor *endpoint;
1556 int i;
1557
1558 iface_desc = &intf->altsetting[0];
1559
1560 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1561 endpoint = &iface_desc->endpoint[i].desc;
1562
1563 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1564 *in = endpoint;
1565
1566 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1567 *out = endpoint;
1568
1569 /* use first bulk endpoint for in and out */
1570 if (*in && *out)
1571 return 0;
1572 }
1573
1574 return -ENODEV;
1575}
1576
1577static int kvaser_usb_probe(struct usb_interface *intf,
1578 const struct usb_device_id *id)
1579{
1580 struct kvaser_usb *dev;
1581 int err = -ENOMEM;
1582 int i;
1583
1584 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1585 if (!dev)
1586 return -ENOMEM;
1587
1588 err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1589 if (err) {
1590 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1591 return err;
1592 }
1593
1594 dev->udev = interface_to_usbdev(intf);
1595
1596 init_usb_anchor(&dev->rx_submitted);
1597
1598 usb_set_intfdata(intf, dev);
1599
1600 for (i = 0; i < MAX_NET_DEVICES; i++)
1601 kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, i);
1602
1603 err = kvaser_usb_get_software_info(dev);
1604 if (err) {
1605 dev_err(&intf->dev,
1606 "Cannot get software infos, error %d\n", err);
1607 return err;
1608 }
1609
1610 err = kvaser_usb_get_card_info(dev);
1611 if (err) {
1612 dev_err(&intf->dev,
1613 "Cannot get card infos, error %d\n", err);
1614 return err;
1615 }
1616
1617 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
1618 ((dev->fw_version >> 24) & 0xff),
1619 ((dev->fw_version >> 16) & 0xff),
1620 (dev->fw_version & 0xffff));
1621
1622 for (i = 0; i < dev->nchannels; i++) {
1623 err = kvaser_usb_init_one(intf, id, i);
1624 if (err) {
1625 kvaser_usb_remove_interfaces(dev);
1626 return err;
1627 }
1628 }
1629
1630 return 0;
1631}
1632
1633static void kvaser_usb_disconnect(struct usb_interface *intf)
1634{
1635 struct kvaser_usb *dev = usb_get_intfdata(intf);
1636
1637 usb_set_intfdata(intf, NULL);
1638
1639 if (!dev)
1640 return;
1641
1642 kvaser_usb_remove_interfaces(dev);
1643}
1644
1645static struct usb_driver kvaser_usb_driver = {
1646 .name = "kvaser_usb",
1647 .probe = kvaser_usb_probe,
1648 .disconnect = kvaser_usb_disconnect,
1649 .id_table = kvaser_usb_table,
1650};
1651
1652module_usb_driver(kvaser_usb_driver);
1653
1654MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
1655MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
1656MODULE_LICENSE("GPL v2");