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can: kvaser_usb: Add support for Kvaser CAN/USB devices
[mirror_ubuntu-eoan-kernel.git] / drivers / net / can / usb / kvaser_usb.c
CommitLineData
080f40a6
OS		 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/init.h>
16#include <linux/completion.h>
17#include <linux/module.h>
18#include <linux/netdevice.h>
19#include <linux/usb.h>
20
21#include <linux/can.h>
22#include <linux/can/dev.h>
23#include <linux/can/error.h>
24
25#define MAX_TX_URBS 16
26#define MAX_RX_URBS 4
27#define START_TIMEOUT 1000 /* msecs */
28#define STOP_TIMEOUT 1000 /* msecs */
29#define USB_SEND_TIMEOUT 1000 /* msecs */
30#define USB_RECV_TIMEOUT 1000 /* msecs */
31#define RX_BUFFER_SIZE 3072
32#define CAN_USB_CLOCK 8000000
33#define MAX_NET_DEVICES 3
34
35/* Kvaser USB devices */
36#define KVASER_VENDOR_ID 0x0bfd
37#define USB_LEAF_DEVEL_PRODUCT_ID 10
38#define USB_LEAF_LITE_PRODUCT_ID 11
39#define USB_LEAF_PRO_PRODUCT_ID 12
40#define USB_LEAF_SPRO_PRODUCT_ID 14
41#define USB_LEAF_PRO_LS_PRODUCT_ID 15
42#define USB_LEAF_PRO_SWC_PRODUCT_ID 16
43#define USB_LEAF_PRO_LIN_PRODUCT_ID 17
44#define USB_LEAF_SPRO_LS_PRODUCT_ID 18
45#define USB_LEAF_SPRO_SWC_PRODUCT_ID 19
46#define USB_MEMO2_DEVEL_PRODUCT_ID 22
47#define USB_MEMO2_HSHS_PRODUCT_ID 23
48#define USB_UPRO_HSHS_PRODUCT_ID 24
49#define USB_LEAF_LITE_GI_PRODUCT_ID 25
50#define USB_LEAF_PRO_OBDII_PRODUCT_ID 26
51#define USB_MEMO2_HSLS_PRODUCT_ID 27
52#define USB_LEAF_LITE_CH_PRODUCT_ID 28
53#define USB_BLACKBIRD_SPRO_PRODUCT_ID 29
54#define USB_OEM_MERCURY_PRODUCT_ID 34
55#define USB_OEM_LEAF_PRODUCT_ID 35
56#define USB_CAN_R_PRODUCT_ID 39
57
58/* USB devices features */
59#define KVASER_HAS_SILENT_MODE BIT(0)
60#define KVASER_HAS_TXRX_ERRORS BIT(1)
61
62/* Message header size */
63#define MSG_HEADER_LEN 2
64
65/* Can message flags */
66#define MSG_FLAG_ERROR_FRAME BIT(0)
67#define MSG_FLAG_OVERRUN BIT(1)
68#define MSG_FLAG_NERR BIT(2)
69#define MSG_FLAG_WAKEUP BIT(3)
70#define MSG_FLAG_REMOTE_FRAME BIT(4)
71#define MSG_FLAG_RESERVED BIT(5)
72#define MSG_FLAG_TX_ACK BIT(6)
73#define MSG_FLAG_TX_REQUEST BIT(7)
74
75/* Can states */
76#define M16C_STATE_BUS_RESET BIT(0)
77#define M16C_STATE_BUS_ERROR BIT(4)
78#define M16C_STATE_BUS_PASSIVE BIT(5)
79#define M16C_STATE_BUS_OFF BIT(6)
80
81/* Can msg ids */
82#define CMD_RX_STD_MESSAGE 12
83#define CMD_TX_STD_MESSAGE 13
84#define CMD_RX_EXT_MESSAGE 14
85#define CMD_TX_EXT_MESSAGE 15
86#define CMD_SET_BUS_PARAMS 16
87#define CMD_GET_BUS_PARAMS 17
88#define CMD_GET_BUS_PARAMS_REPLY 18
89#define CMD_GET_CHIP_STATE 19
90#define CMD_CHIP_STATE_EVENT 20
91#define CMD_SET_CTRL_MODE 21
92#define CMD_GET_CTRL_MODE 22
93#define CMD_GET_CTRL_MODE_REPLY 23
94#define CMD_RESET_CHIP 24
95#define CMD_RESET_CARD 25
96#define CMD_START_CHIP 26
97#define CMD_START_CHIP_REPLY 27
98#define CMD_STOP_CHIP 28
99#define CMD_STOP_CHIP_REPLY 29
100#define CMD_GET_CARD_INFO2 32
101#define CMD_GET_CARD_INFO 34
102#define CMD_GET_CARD_INFO_REPLY 35
103#define CMD_GET_SOFTWARE_INFO 38
104#define CMD_GET_SOFTWARE_INFO_REPLY 39
105#define CMD_ERROR_EVENT 45
106#define CMD_FLUSH_QUEUE 48
107#define CMD_RESET_ERROR_COUNTER 49
108#define CMD_TX_ACKNOWLEDGE 50
109#define CMD_CAN_ERROR_EVENT 51
110#define CMD_USB_THROTTLE 77
111#define CMD_LOG_MESSAGE 106
112
113/* error factors */
114#define M16C_EF_ACKE BIT(0)
115#define M16C_EF_CRCE BIT(1)
116#define M16C_EF_FORME BIT(2)
117#define M16C_EF_STFE BIT(3)
118#define M16C_EF_BITE0 BIT(4)
119#define M16C_EF_BITE1 BIT(5)
120#define M16C_EF_RCVE BIT(6)
121#define M16C_EF_TRE BIT(7)
122
123/* bittiming parameters */
124#define KVASER_USB_TSEG1_MIN 1
125#define KVASER_USB_TSEG1_MAX 16
126#define KVASER_USB_TSEG2_MIN 1
127#define KVASER_USB_TSEG2_MAX 8
128#define KVASER_USB_SJW_MAX 4
129#define KVASER_USB_BRP_MIN 1
130#define KVASER_USB_BRP_MAX 64
131#define KVASER_USB_BRP_INC 1
132
133/* ctrl modes */
134#define KVASER_CTRL_MODE_NORMAL 1
135#define KVASER_CTRL_MODE_SILENT 2
136#define KVASER_CTRL_MODE_SELFRECEPTION 3
137#define KVASER_CTRL_MODE_OFF 4
138
139struct kvaser_msg_simple {
140 u8 tid;
141 u8 channel;
142} __packed;
143
144struct kvaser_msg_cardinfo {
145 u8 tid;
146 u8 nchannels;
147 __le32 serial_number;
148 __le32 padding;
149 __le32 clock_resolution;
150 __le32 mfgdate;
151 u8 ean[8];
152 u8 hw_revision;
153 u8 usb_hs_mode;
154 __le16 padding2;
155} __packed;
156
157struct kvaser_msg_cardinfo2 {
158 u8 tid;
159 u8 channel;
160 u8 pcb_id[24];
161 __le32 oem_unlock_code;
162} __packed;
163
164struct kvaser_msg_softinfo {
165 u8 tid;
166 u8 channel;
167 __le32 sw_options;
168 __le32 fw_version;
169 __le16 max_outstanding_tx;
170 __le16 padding[9];
171} __packed;
172
173struct kvaser_msg_busparams {
174 u8 tid;
175 u8 channel;
176 __le32 bitrate;
177 u8 tseg1;
178 u8 tseg2;
179 u8 sjw;
180 u8 no_samp;
181} __packed;
182
183struct kvaser_msg_tx_can {
184 u8 channel;
185 u8 tid;
186 u8 msg[14];
187 u8 padding;
188 u8 flags;
189} __packed;
190
191struct kvaser_msg_rx_can {
192 u8 channel;
193 u8 flag;
194 __le16 time[3];
195 u8 msg[14];
196} __packed;
197
198struct kvaser_msg_chip_state_event {
199 u8 tid;
200 u8 channel;
201 __le16 time[3];
202 u8 tx_errors_count;
203 u8 rx_errors_count;
204 u8 status;
205 u8 padding[3];
206} __packed;
207
208struct kvaser_msg_tx_acknowledge {
209 u8 channel;
210 u8 tid;
211 __le16 time[3];
212 u8 flags;
213 u8 time_offset;
214} __packed;
215
216struct kvaser_msg_error_event {
217 u8 tid;
218 u8 flags;
219 __le16 time[3];
220 u8 channel;
221 u8 padding;
222 u8 tx_errors_count;
223 u8 rx_errors_count;
224 u8 status;
225 u8 error_factor;
226} __packed;
227
228struct kvaser_msg_ctrl_mode {
229 u8 tid;
230 u8 channel;
231 u8 ctrl_mode;
232 u8 padding[3];
233} __packed;
234
235struct kvaser_msg_flush_queue {
236 u8 tid;
237 u8 channel;
238 u8 flags;
239 u8 padding[3];
240} __packed;
241
242struct kvaser_msg_log_message {
243 u8 channel;
244 u8 flags;
245 __le16 time[3];
246 u8 dlc;
247 u8 time_offset;
248 __le32 id;
249 u8 data[8];
250} __packed;
251
252struct kvaser_msg {
253 u8 len;
254 u8 id;
255 union {
256 struct kvaser_msg_simple simple;
257 struct kvaser_msg_cardinfo cardinfo;
258 struct kvaser_msg_cardinfo2 cardinfo2;
259 struct kvaser_msg_softinfo softinfo;
260 struct kvaser_msg_busparams busparams;
261 struct kvaser_msg_tx_can tx_can;
262 struct kvaser_msg_rx_can rx_can;
263 struct kvaser_msg_chip_state_event chip_state_event;
264 struct kvaser_msg_tx_acknowledge tx_acknowledge;
265 struct kvaser_msg_error_event error_event;
266 struct kvaser_msg_ctrl_mode ctrl_mode;
267 struct kvaser_msg_flush_queue flush_queue;
268 struct kvaser_msg_log_message log_message;
269 } u;
270} __packed;
271
272struct kvaser_usb_tx_urb_context {
273 struct kvaser_usb_net_priv *priv;
274 u32 echo_index;
275 int dlc;
276};
277
278struct kvaser_usb {
279 struct usb_device *udev;
280 struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
281
282 struct usb_endpoint_descriptor *bulk_in, *bulk_out;
283 struct usb_anchor rx_submitted;
284
285 u32 fw_version;
286 unsigned int nchannels;
287
288 bool rxinitdone;
289 void *rxbuf[MAX_RX_URBS];
290 dma_addr_t rxbuf_dma[MAX_RX_URBS];
291};
292
293struct kvaser_usb_net_priv {
294 struct can_priv can;
295
296 atomic_t active_tx_urbs;
297 struct usb_anchor tx_submitted;
298 struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
299
300 struct completion start_comp, stop_comp;
301
302 struct kvaser_usb *dev;
303 struct net_device *netdev;
304 int channel;
305
306 struct can_berr_counter bec;
307};
308
309static const struct usb_device_id kvaser_usb_table[] = {
310 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
311 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
312 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
313 .driver_info = KVASER_HAS_TXRX_ERRORS |
314 KVASER_HAS_SILENT_MODE },
315 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
316 .driver_info = KVASER_HAS_TXRX_ERRORS |
317 KVASER_HAS_SILENT_MODE },
318 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
319 .driver_info = KVASER_HAS_TXRX_ERRORS |
320 KVASER_HAS_SILENT_MODE },
321 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
322 .driver_info = KVASER_HAS_TXRX_ERRORS |
323 KVASER_HAS_SILENT_MODE },
324 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
325 .driver_info = KVASER_HAS_TXRX_ERRORS |
326 KVASER_HAS_SILENT_MODE },
327 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
328 .driver_info = KVASER_HAS_TXRX_ERRORS |
329 KVASER_HAS_SILENT_MODE },
330 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
331 .driver_info = KVASER_HAS_TXRX_ERRORS |
332 KVASER_HAS_SILENT_MODE },
333 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
334 .driver_info = KVASER_HAS_TXRX_ERRORS |
335 KVASER_HAS_SILENT_MODE },
336 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
337 .driver_info = KVASER_HAS_TXRX_ERRORS |
338 KVASER_HAS_SILENT_MODE },
339 { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
340 .driver_info = KVASER_HAS_TXRX_ERRORS },
341 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
342 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
343 .driver_info = KVASER_HAS_TXRX_ERRORS |
344 KVASER_HAS_SILENT_MODE },
345 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
346 .driver_info = KVASER_HAS_TXRX_ERRORS },
347 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
348 .driver_info = KVASER_HAS_TXRX_ERRORS },
349 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
350 .driver_info = KVASER_HAS_TXRX_ERRORS },
351 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
352 .driver_info = KVASER_HAS_TXRX_ERRORS },
353 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
354 .driver_info = KVASER_HAS_TXRX_ERRORS },
355 { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
356 .driver_info = KVASER_HAS_TXRX_ERRORS },
357 { }
358};
359MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
360
361static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
362 struct kvaser_msg *msg)
363{
364 int actual_len;
365
366 return usb_bulk_msg(dev->udev,
367 usb_sndbulkpipe(dev->udev,
368 dev->bulk_out->bEndpointAddress),
369 msg, msg->len, &actual_len,
370 USB_SEND_TIMEOUT);
371}
372
373static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
374 struct kvaser_msg *msg)
375{
376 struct kvaser_msg *tmp;
377 void *buf;
378 int actual_len;
379 int err;
380 int pos = 0;
381
382 buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
383 if (!buf)
384 return -ENOMEM;
385
386 err = usb_bulk_msg(dev->udev,
387 usb_rcvbulkpipe(dev->udev,
388 dev->bulk_in->bEndpointAddress),
389 buf, RX_BUFFER_SIZE, &actual_len,
390 USB_RECV_TIMEOUT);
391 if (err < 0)
392 goto end;
393
394 while (pos <= actual_len - MSG_HEADER_LEN) {
395 tmp = buf + pos;
396
397 if (!tmp->len)
398 break;
399
400 if (pos + tmp->len > actual_len) {
401 dev_err(dev->udev->dev.parent, "Format error\n");
402 break;
403 }
404
405 if (tmp->id == id) {
406 memcpy(msg, tmp, tmp->len);
407 goto end;
408 }
409
410 pos += tmp->len;
411 }
412
413 err = -EINVAL;
414
415end:
416 kfree(buf);
417
418 return err;
419}
420
421static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
422 u8 msg_id, int channel)
423{
424 struct kvaser_msg *msg;
425 int rc;
426
427 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
428 if (!msg)
429 return -ENOMEM;
430
431 msg->id = msg_id;
432 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
433 msg->u.simple.channel = channel;
434 msg->u.simple.tid = 0xff;
435
436 rc = kvaser_usb_send_msg(dev, msg);
437
438 kfree(msg);
439 return rc;
440}
441
442static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
443{
444 struct kvaser_msg msg;
445 int err;
446
447 err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
448 if (err)
449 return err;
450
451 err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
452 if (err)
453 return err;
454
455 dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version);
456
457 return 0;
458}
459
460static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
461{
462 struct kvaser_msg msg;
463 int err;
464
465 err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
466 if (err)
467 return err;
468
469 err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
470 if (err)
471 return err;
472
473 dev->nchannels = msg.u.cardinfo.nchannels;
474
475 return 0;
476}
477
478static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
479 const struct kvaser_msg *msg)
480{
481 struct net_device_stats *stats;
482 struct kvaser_usb_tx_urb_context *context;
483 struct kvaser_usb_net_priv *priv;
484 struct sk_buff *skb;
485 struct can_frame *cf;
486 u8 channel = msg->u.tx_acknowledge.channel;
487 u8 tid = msg->u.tx_acknowledge.tid;
488
489 if (channel >= dev->nchannels) {
490 dev_err(dev->udev->dev.parent,
491 "Invalid channel number (%d)\n", channel);
492 return;
493 }
494
495 priv = dev->nets[channel];
496
497 if (!netif_device_present(priv->netdev))
498 return;
499
500 stats = &priv->netdev->stats;
501
502 context = &priv->tx_contexts[tid % MAX_TX_URBS];
503
504 /* Sometimes the state change doesn't come after a bus-off event */
505 if (priv->can.restart_ms &&
506 (priv->can.state >= CAN_STATE_BUS_OFF)) {
507 skb = alloc_can_err_skb(priv->netdev, &cf);
508 if (skb) {
509 cf->can_id |= CAN_ERR_RESTARTED;
510 netif_rx(skb);
511
512 stats->rx_packets++;
513 stats->rx_bytes += cf->can_dlc;
514 } else {
515 netdev_err(priv->netdev,
516 "No memory left for err_skb\n");
517 }
518
519 priv->can.can_stats.restarts++;
520 netif_carrier_on(priv->netdev);
521
522 priv->can.state = CAN_STATE_ERROR_ACTIVE;
523 }
524
525 stats->tx_packets++;
526 stats->tx_bytes += context->dlc;
527 can_get_echo_skb(priv->netdev, context->echo_index);
528
529 context->echo_index = MAX_TX_URBS;
530 atomic_dec(&priv->active_tx_urbs);
531
532 netif_wake_queue(priv->netdev);
533}
534
535static void kvaser_usb_simple_msg_callback(struct urb *urb)
536{
537 struct net_device *netdev = urb->context;
538
539 kfree(urb->transfer_buffer);
540
541 if (urb->status)
542 netdev_warn(netdev, "urb status received: %d\n",
543 urb->status);
544}
545
546static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
547 u8 msg_id)
548{
549 struct kvaser_usb *dev = priv->dev;
550 struct net_device *netdev = priv->netdev;
551 struct kvaser_msg *msg;
552 struct urb *urb;
553 void *buf;
554 int err;
555
556 urb = usb_alloc_urb(0, GFP_ATOMIC);
557 if (!urb) {
558 netdev_err(netdev, "No memory left for URBs\n");
559 return -ENOMEM;
560 }
561
562 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
563 if (!buf) {
564 netdev_err(netdev, "No memory left for USB buffer\n");
565 usb_free_urb(urb);
566 return -ENOMEM;
567 }
568
569 msg = (struct kvaser_msg *)buf;
570 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
571 msg->id = msg_id;
572 msg->u.simple.channel = priv->channel;
573
574 usb_fill_bulk_urb(urb, dev->udev,
575 usb_sndbulkpipe(dev->udev,
576 dev->bulk_out->bEndpointAddress),
577 buf, msg->len,
578 kvaser_usb_simple_msg_callback, priv);
579 usb_anchor_urb(urb, &priv->tx_submitted);
580
581 err = usb_submit_urb(urb, GFP_ATOMIC);
582 if (err) {
583 netdev_err(netdev, "Error transmitting URB\n");
584 usb_unanchor_urb(urb);
585 usb_free_urb(urb);
586 kfree(buf);
587 return err;
588 }
589
590 usb_free_urb(urb);
591
592 return 0;
593}
594
595static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
596{
597 int i;
598
599 usb_kill_anchored_urbs(&priv->tx_submitted);
600 atomic_set(&priv->active_tx_urbs, 0);
601
602 for (i = 0; i < MAX_TX_URBS; i++)
603 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
604}
605
606static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
607 const struct kvaser_msg *msg)
608{
609 struct can_frame *cf;
610 struct sk_buff *skb;
611 struct net_device_stats *stats;
612 struct kvaser_usb_net_priv *priv;
613 unsigned int new_state;
614 u8 channel, status, txerr, rxerr, error_factor;
615
616 switch (msg->id) {
617 case CMD_CAN_ERROR_EVENT:
618 channel = msg->u.error_event.channel;
619 status = msg->u.error_event.status;
620 txerr = msg->u.error_event.tx_errors_count;
621 rxerr = msg->u.error_event.rx_errors_count;
622 error_factor = msg->u.error_event.error_factor;
623 break;
624 case CMD_LOG_MESSAGE:
625 channel = msg->u.log_message.channel;
626 status = msg->u.log_message.data[0];
627 txerr = msg->u.log_message.data[2];
628 rxerr = msg->u.log_message.data[3];
629 error_factor = msg->u.log_message.data[1];
630 break;
631 case CMD_CHIP_STATE_EVENT:
632 channel = msg->u.chip_state_event.channel;
633 status = msg->u.chip_state_event.status;
634 txerr = msg->u.chip_state_event.tx_errors_count;
635 rxerr = msg->u.chip_state_event.rx_errors_count;
636 error_factor = 0;
637 break;
638 default:
639 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
640 msg->id);
641 return;
642 }
643
644 if (channel >= dev->nchannels) {
645 dev_err(dev->udev->dev.parent,
646 "Invalid channel number (%d)\n", channel);
647 return;
648 }
649
650 priv = dev->nets[channel];
651 stats = &priv->netdev->stats;
652
653 if (status & M16C_STATE_BUS_RESET) {
654 kvaser_usb_unlink_tx_urbs(priv);
655 return;
656 }
657
658 skb = alloc_can_err_skb(priv->netdev, &cf);
659 if (!skb) {
660 stats->rx_dropped++;
661 return;
662 }
663
664 new_state = priv->can.state;
665
666 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status);
667
668 if (status & M16C_STATE_BUS_OFF) {
669 cf->can_id |= CAN_ERR_BUSOFF;
670
671 priv->can.can_stats.bus_off++;
672 if (!priv->can.restart_ms)
673 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
674
675 netif_carrier_off(priv->netdev);
676
677 new_state = CAN_STATE_BUS_OFF;
678 } else if (status & M16C_STATE_BUS_PASSIVE) {
679 if (priv->can.state != CAN_STATE_ERROR_PASSIVE) {
680 cf->can_id |= CAN_ERR_CRTL;
681
682 if (txerr || rxerr)
683 cf->data[1] = (txerr > rxerr)
684 ? CAN_ERR_CRTL_TX_PASSIVE
685 : CAN_ERR_CRTL_RX_PASSIVE;
686 else
687 cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE |
688 CAN_ERR_CRTL_RX_PASSIVE;
689
690 priv->can.can_stats.error_passive++;
691 }
692
693 new_state = CAN_STATE_ERROR_PASSIVE;
694 }
695
696 if (status == M16C_STATE_BUS_ERROR) {
697 if ((priv->can.state < CAN_STATE_ERROR_WARNING) &&
698 ((txerr >= 96) || (rxerr >= 96))) {
699 cf->can_id |= CAN_ERR_CRTL;
700 cf->data[1] = (txerr > rxerr)
701 ? CAN_ERR_CRTL_TX_WARNING
702 : CAN_ERR_CRTL_RX_WARNING;
703
704 priv->can.can_stats.error_warning++;
705 new_state = CAN_STATE_ERROR_WARNING;
706 } else if (priv->can.state > CAN_STATE_ERROR_ACTIVE) {
707 cf->can_id |= CAN_ERR_PROT;
708 cf->data[2] = CAN_ERR_PROT_ACTIVE;
709
710 new_state = CAN_STATE_ERROR_ACTIVE;
711 }
712 }
713
714 if (!status) {
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 if (priv->can.restart_ms &&
722 (priv->can.state >= CAN_STATE_BUS_OFF) &&
723 (new_state < CAN_STATE_BUS_OFF)) {
724 cf->can_id |= CAN_ERR_RESTARTED;
725 netif_carrier_on(priv->netdev);
726
727 priv->can.can_stats.restarts++;
728 }
729
730 if (error_factor) {
731 priv->can.can_stats.bus_error++;
732 stats->rx_errors++;
733
734 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
735
736 if (error_factor & M16C_EF_ACKE)
737 cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
738 if (error_factor & M16C_EF_CRCE)
739 cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
740 CAN_ERR_PROT_LOC_CRC_DEL);
741 if (error_factor & M16C_EF_FORME)
742 cf->data[2] |= CAN_ERR_PROT_FORM;
743 if (error_factor & M16C_EF_STFE)
744 cf->data[2] |= CAN_ERR_PROT_STUFF;
745 if (error_factor & M16C_EF_BITE0)
746 cf->data[2] |= CAN_ERR_PROT_BIT0;
747 if (error_factor & M16C_EF_BITE1)
748 cf->data[2] |= CAN_ERR_PROT_BIT1;
749 if (error_factor & M16C_EF_TRE)
750 cf->data[2] |= CAN_ERR_PROT_TX;
751 }
752
753 cf->data[6] = txerr;
754 cf->data[7] = rxerr;
755
756 priv->bec.txerr = txerr;
757 priv->bec.rxerr = rxerr;
758
759 priv->can.state = new_state;
760
761 netif_rx(skb);
762
763 stats->rx_packets++;
764 stats->rx_bytes += cf->can_dlc;
765}
766
767static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
768 const struct kvaser_msg *msg)
769{
770 struct can_frame *cf;
771 struct sk_buff *skb;
772 struct net_device_stats *stats = &priv->netdev->stats;
773
774 if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
775 MSG_FLAG_NERR)) {
776 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
777 msg->u.rx_can.flag);
778
779 stats->rx_errors++;
780 return;
781 }
782
783 if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) {
784 skb = alloc_can_err_skb(priv->netdev, &cf);
785 if (!skb) {
786 stats->rx_dropped++;
787 return;
788 }
789
790 cf->can_id |= CAN_ERR_CRTL;
791 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
792
793 stats->rx_over_errors++;
794 stats->rx_errors++;
795
796 netif_rx(skb);
797
798 stats->rx_packets++;
799 stats->rx_bytes += cf->can_dlc;
800 }
801}
802
803static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
804 const struct kvaser_msg *msg)
805{
806 struct kvaser_usb_net_priv *priv;
807 struct can_frame *cf;
808 struct sk_buff *skb;
809 struct net_device_stats *stats;
810 u8 channel = msg->u.rx_can.channel;
811
812 if (channel >= dev->nchannels) {
813 dev_err(dev->udev->dev.parent,
814 "Invalid channel number (%d)\n", channel);
815 return;
816 }
817
818 priv = dev->nets[channel];
819 stats = &priv->netdev->stats;
820
821 if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME | MSG_FLAG_NERR |
822 MSG_FLAG_OVERRUN)) {
823 kvaser_usb_rx_can_err(priv, msg);
824 return;
825 } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) {
826 netdev_warn(priv->netdev,
827 "Unhandled frame (flags: 0x%02x)",
828 msg->u.rx_can.flag);
829 return;
830 }
831
832 skb = alloc_can_skb(priv->netdev, &cf);
833 if (!skb) {
834 stats->tx_dropped++;
835 return;
836 }
837
838 cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) |
839 (msg->u.rx_can.msg[1] & 0x3f);
840 cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]);
841
842 if (msg->id == CMD_RX_EXT_MESSAGE) {
843 cf->can_id <<= 18;
844 cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) |
845 ((msg->u.rx_can.msg[3] & 0xff) << 6) |
846 (msg->u.rx_can.msg[4] & 0x3f);
847 cf->can_id |= CAN_EFF_FLAG;
848 }
849
850 if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME)
851 cf->can_id |= CAN_RTR_FLAG;
852 else
853 memcpy(cf->data, &msg->u.rx_can.msg[6], cf->can_dlc);
854
855 netif_rx(skb);
856
857 stats->rx_packets++;
858 stats->rx_bytes += cf->can_dlc;
859}
860
861static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
862 const struct kvaser_msg *msg)
863{
864 struct kvaser_usb_net_priv *priv;
865 u8 channel = msg->u.simple.channel;
866
867 if (channel >= dev->nchannels) {
868 dev_err(dev->udev->dev.parent,
869 "Invalid channel number (%d)\n", channel);
870 return;
871 }
872
873 priv = dev->nets[channel];
874
875 if (completion_done(&priv->start_comp) &&
876 netif_queue_stopped(priv->netdev)) {
877 netif_wake_queue(priv->netdev);
878 } else {
879 netif_start_queue(priv->netdev);
880 complete(&priv->start_comp);
881 }
882}
883
884static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
885 const struct kvaser_msg *msg)
886{
887 struct kvaser_usb_net_priv *priv;
888 u8 channel = msg->u.simple.channel;
889
890 if (channel >= dev->nchannels) {
891 dev_err(dev->udev->dev.parent,
892 "Invalid channel number (%d)\n", channel);
893 return;
894 }
895
896 priv = dev->nets[channel];
897
898 complete(&priv->stop_comp);
899}
900
901static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
902 const struct kvaser_msg *msg)
903{
904 switch (msg->id) {
905 case CMD_START_CHIP_REPLY:
906 kvaser_usb_start_chip_reply(dev, msg);
907 break;
908
909 case CMD_STOP_CHIP_REPLY:
910 kvaser_usb_stop_chip_reply(dev, msg);
911 break;
912
913 case CMD_RX_STD_MESSAGE:
914 case CMD_RX_EXT_MESSAGE:
915 kvaser_usb_rx_can_msg(dev, msg);
916 break;
917
918 case CMD_CHIP_STATE_EVENT:
919 case CMD_CAN_ERROR_EVENT:
920 kvaser_usb_rx_error(dev, msg);
921 break;
922
923 case CMD_LOG_MESSAGE:
924 if (msg->u.log_message.flags & MSG_FLAG_ERROR_FRAME)
925 kvaser_usb_rx_error(dev, msg);
926 break;
927
928 case CMD_TX_ACKNOWLEDGE:
929 kvaser_usb_tx_acknowledge(dev, msg);
930 break;
931
932 default:
933 dev_warn(dev->udev->dev.parent,
934 "Unhandled message (%d)\n", msg->id);
935 break;
936 }
937}
938
939static void kvaser_usb_read_bulk_callback(struct urb *urb)
940{
941 struct kvaser_usb *dev = urb->context;
942 struct kvaser_msg *msg;
943 int pos = 0;
944 int err, i;
945
946 switch (urb->status) {
947 case 0:
948 break;
949 case -ENOENT:
950 case -ESHUTDOWN:
951 return;
952 default:
953 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
954 urb->status);
955 goto resubmit_urb;
956 }
957
958 while (pos <= urb->actual_length - MSG_HEADER_LEN) {
959 msg = urb->transfer_buffer + pos;
960
961 if (!msg->len)
962 break;
963
964 if (pos + msg->len > urb->actual_length) {
965 dev_err(dev->udev->dev.parent, "Format error\n");
966 break;
967 }
968
969 kvaser_usb_handle_message(dev, msg);
970
971 pos += msg->len;
972 }
973
974resubmit_urb:
975 usb_fill_bulk_urb(urb, dev->udev,
976 usb_rcvbulkpipe(dev->udev,
977 dev->bulk_in->bEndpointAddress),
978 urb->transfer_buffer, RX_BUFFER_SIZE,
979 kvaser_usb_read_bulk_callback, dev);
980
981 err = usb_submit_urb(urb, GFP_ATOMIC);
982 if (err == -ENODEV) {
983 for (i = 0; i < dev->nchannels; i++) {
984 if (!dev->nets[i])
985 continue;
986
987 netif_device_detach(dev->nets[i]->netdev);
988 }
989 } else if (err) {
990 dev_err(dev->udev->dev.parent,
991 "Failed resubmitting read bulk urb: %d\n", err);
992 }
993
994 return;
995}
996
997static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
998{
999 int i, err = 0;
1000
1001 if (dev->rxinitdone)
1002 return 0;
1003
1004 for (i = 0; i < MAX_RX_URBS; i++) {
1005 struct urb *urb = NULL;
1006 u8 *buf = NULL;
1007 dma_addr_t buf_dma;
1008
1009 urb = usb_alloc_urb(0, GFP_KERNEL);
1010 if (!urb) {
1011 dev_warn(dev->udev->dev.parent,
1012 "No memory left for URBs\n");
1013 err = -ENOMEM;
1014 break;
1015 }
1016
1017 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1018 GFP_KERNEL, &buf_dma);
1019 if (!buf) {
1020 dev_warn(dev->udev->dev.parent,
1021 "No memory left for USB buffer\n");
1022 usb_free_urb(urb);
1023 err = -ENOMEM;
1024 break;
1025 }
1026
1027 usb_fill_bulk_urb(urb, dev->udev,
1028 usb_rcvbulkpipe(dev->udev,
1029 dev->bulk_in->bEndpointAddress),
1030 buf, RX_BUFFER_SIZE,
1031 kvaser_usb_read_bulk_callback,
1032 dev);
1033 urb->transfer_dma = buf_dma;
1034 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1035 usb_anchor_urb(urb, &dev->rx_submitted);
1036
1037 err = usb_submit_urb(urb, GFP_KERNEL);
1038 if (err) {
1039 usb_unanchor_urb(urb);
1040 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1041 buf_dma);
1042 usb_free_urb(urb);
1043 break;
1044 }
1045
1046 dev->rxbuf[i] = buf;
1047 dev->rxbuf_dma[i] = buf_dma;
1048
1049 usb_free_urb(urb);
1050 }
1051
1052 if (i == 0) {
1053 dev_warn(dev->udev->dev.parent,
1054 "Cannot setup read URBs, error %d\n", err);
1055 return err;
1056 } else if (i < MAX_RX_URBS) {
1057 dev_warn(dev->udev->dev.parent,
1058 "RX performances may be slow\n");
1059 }
1060
1061 dev->rxinitdone = true;
1062
1063 return 0;
1064}
1065
1066static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1067{
1068 struct kvaser_msg *msg;
1069 int rc;
1070
1071 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1072 if (!msg)
1073 return -ENOMEM;
1074
1075 msg->id = CMD_SET_CTRL_MODE;
1076 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1077 msg->u.ctrl_mode.tid = 0xff;
1078 msg->u.ctrl_mode.channel = priv->channel;
1079
1080 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1081 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1082 else
1083 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1084
1085 rc = kvaser_usb_send_msg(priv->dev, msg);
1086
1087 kfree(msg);
1088 return rc;
1089}
1090
1091static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1092{
1093 int err;
1094
1095 init_completion(&priv->start_comp);
1096
1097 err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1098 priv->channel);
1099 if (err)
1100 return err;
1101
1102 if (!wait_for_completion_timeout(&priv->start_comp,
1103 msecs_to_jiffies(START_TIMEOUT)))
1104 return -ETIMEDOUT;
1105
1106 return 0;
1107}
1108
1109static int kvaser_usb_open(struct net_device *netdev)
1110{
1111 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1112 struct kvaser_usb *dev = priv->dev;
1113 int err;
1114
1115 err = open_candev(netdev);
1116 if (err)
1117 return err;
1118
1119 err = kvaser_usb_setup_rx_urbs(dev);
1120 if (err)
1121 goto error;
1122
1123 err = kvaser_usb_set_opt_mode(priv);
1124 if (err)
1125 goto error;
1126
1127 err = kvaser_usb_start_chip(priv);
1128 if (err) {
1129 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1130 goto error;
1131 }
1132
1133 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1134
1135 return 0;
1136
1137error:
1138 close_candev(netdev);
1139 return err;
1140}
1141
1142static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1143{
1144 int i;
1145
1146 usb_kill_anchored_urbs(&dev->rx_submitted);
1147
1148 for (i = 0; i < MAX_RX_URBS; i++)
1149 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1150 dev->rxbuf[i],
1151 dev->rxbuf_dma[i]);
1152
1153 for (i = 0; i < MAX_NET_DEVICES; i++) {
1154 struct kvaser_usb_net_priv *priv = dev->nets[i];
1155
1156 if (priv)
1157 kvaser_usb_unlink_tx_urbs(priv);
1158 }
1159}
1160
1161static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1162{
1163 int err;
1164
1165 init_completion(&priv->stop_comp);
1166
1167 err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1168 priv->channel);
1169 if (err)
1170 return err;
1171
1172 if (!wait_for_completion_timeout(&priv->stop_comp,
1173 msecs_to_jiffies(STOP_TIMEOUT)))
1174 return -ETIMEDOUT;
1175
1176 return 0;
1177}
1178
1179static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1180{
1181 struct kvaser_msg *msg;
1182 int rc;
1183
1184 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1185 if (!msg)
1186 return -ENOMEM;
1187
1188 msg->id = CMD_FLUSH_QUEUE;
1189 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1190 msg->u.flush_queue.channel = priv->channel;
1191 msg->u.flush_queue.flags = 0x00;
1192
1193 rc = kvaser_usb_send_msg(priv->dev, msg);
1194
1195 kfree(msg);
1196 return rc;
1197}
1198
1199static int kvaser_usb_close(struct net_device *netdev)
1200{
1201 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1202 struct kvaser_usb *dev = priv->dev;
1203 int err;
1204
1205 netif_stop_queue(netdev);
1206
1207 err = kvaser_usb_flush_queue(priv);
1208 if (err)
1209 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1210
1211 if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1212 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1213
1214 err = kvaser_usb_stop_chip(priv);
1215 if (err)
1216 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1217
1218 priv->can.state = CAN_STATE_STOPPED;
1219 close_candev(priv->netdev);
1220
1221 return 0;
1222}
1223
1224static void kvaser_usb_write_bulk_callback(struct urb *urb)
1225{
1226 struct kvaser_usb_tx_urb_context *context = urb->context;
1227 struct kvaser_usb_net_priv *priv;
1228 struct net_device *netdev;
1229
1230 if (WARN_ON(!context))
1231 return;
1232
1233 priv = context->priv;
1234 netdev = priv->netdev;
1235
1236 kfree(urb->transfer_buffer);
1237
1238 if (!netif_device_present(netdev))
1239 return;
1240
1241 if (urb->status)
1242 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1243}
1244
1245static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1246 struct net_device *netdev)
1247{
1248 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1249 struct kvaser_usb *dev = priv->dev;
1250 struct net_device_stats *stats = &netdev->stats;
1251 struct can_frame *cf = (struct can_frame *)skb->data;
1252 struct kvaser_usb_tx_urb_context *context = NULL;
1253 struct urb *urb;
1254 void *buf;
1255 struct kvaser_msg *msg;
1256 int i, err;
1257 int ret = NETDEV_TX_OK;
1258
1259 if (can_dropped_invalid_skb(netdev, skb))
1260 return NETDEV_TX_OK;
1261
1262 urb = usb_alloc_urb(0, GFP_ATOMIC);
1263 if (!urb) {
1264 netdev_err(netdev, "No memory left for URBs\n");
1265 stats->tx_dropped++;
1266 goto nourbmem;
1267 }
1268
1269 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1270 if (!buf) {
1271 netdev_err(netdev, "No memory left for USB buffer\n");
1272 stats->tx_dropped++;
1273 goto nobufmem;
1274 }
1275
1276 msg = buf;
1277 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1278 msg->u.tx_can.flags = 0;
1279 msg->u.tx_can.channel = priv->channel;
1280
1281 if (cf->can_id & CAN_EFF_FLAG) {
1282 msg->id = CMD_TX_EXT_MESSAGE;
1283 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1284 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1285 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1286 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1287 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1288 } else {
1289 msg->id = CMD_TX_STD_MESSAGE;
1290 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1291 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1292 }
1293
1294 msg->u.tx_can.msg[5] = cf->can_dlc;
1295 memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1296
1297 if (cf->can_id & CAN_RTR_FLAG)
1298 msg->u.tx_can.flags |= MSG_FLAG_REMOTE_FRAME;
1299
1300 for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1301 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1302 context = &priv->tx_contexts[i];
1303 break;
1304 }
1305 }
1306
1307 if (!context) {
1308 netdev_warn(netdev, "cannot find free context\n");
1309 ret = NETDEV_TX_BUSY;
1310 goto releasebuf;
1311 }
1312
1313 context->priv = priv;
1314 context->echo_index = i;
1315 context->dlc = cf->can_dlc;
1316
1317 msg->u.tx_can.tid = context->echo_index;
1318
1319 usb_fill_bulk_urb(urb, dev->udev,
1320 usb_sndbulkpipe(dev->udev,
1321 dev->bulk_out->bEndpointAddress),
1322 buf, msg->len,
1323 kvaser_usb_write_bulk_callback, context);
1324 usb_anchor_urb(urb, &priv->tx_submitted);
1325
1326 can_put_echo_skb(skb, netdev, context->echo_index);
1327
1328 atomic_inc(&priv->active_tx_urbs);
1329
1330 if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
1331 netif_stop_queue(netdev);
1332
1333 err = usb_submit_urb(urb, GFP_ATOMIC);
1334 if (unlikely(err)) {
1335 can_free_echo_skb(netdev, context->echo_index);
1336
1337 skb = NULL; /* set to NULL to avoid double free in
1338 * dev_kfree_skb(skb) */
1339
1340 atomic_dec(&priv->active_tx_urbs);
1341 usb_unanchor_urb(urb);
1342
1343 stats->tx_dropped++;
1344
1345 if (err == -ENODEV)
1346 netif_device_detach(netdev);
1347 else
1348 netdev_warn(netdev, "Failed tx_urb %d\n", err);
1349
1350 goto releasebuf;
1351 }
1352
1353 usb_free_urb(urb);
1354
1355 return NETDEV_TX_OK;
1356
1357releasebuf:
1358 kfree(buf);
1359nobufmem:
1360 usb_free_urb(urb);
1361nourbmem:
1362 dev_kfree_skb(skb);
1363 return ret;
1364}
1365
1366static const struct net_device_ops kvaser_usb_netdev_ops = {
1367 .ndo_open = kvaser_usb_open,
1368 .ndo_stop = kvaser_usb_close,
1369 .ndo_start_xmit = kvaser_usb_start_xmit,
1370};
1371
1372static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1373 .name = "kvaser_usb",
1374 .tseg1_min = KVASER_USB_TSEG1_MIN,
1375 .tseg1_max = KVASER_USB_TSEG1_MAX,
1376 .tseg2_min = KVASER_USB_TSEG2_MIN,
1377 .tseg2_max = KVASER_USB_TSEG2_MAX,
1378 .sjw_max = KVASER_USB_SJW_MAX,
1379 .brp_min = KVASER_USB_BRP_MIN,
1380 .brp_max = KVASER_USB_BRP_MAX,
1381 .brp_inc = KVASER_USB_BRP_INC,
1382};
1383
1384static int kvaser_usb_set_bittiming(struct net_device *netdev)
1385{
1386 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1387 struct can_bittiming *bt = &priv->can.bittiming;
1388 struct kvaser_usb *dev = priv->dev;
1389 struct kvaser_msg *msg;
1390 int rc;
1391
1392 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1393 if (!msg)
1394 return -ENOMEM;
1395
1396 msg->id = CMD_SET_BUS_PARAMS;
1397 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1398 msg->u.busparams.channel = priv->channel;
1399 msg->u.busparams.tid = 0xff;
1400 msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1401 msg->u.busparams.sjw = bt->sjw;
1402 msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1403 msg->u.busparams.tseg2 = bt->phase_seg2;
1404
1405 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1406 msg->u.busparams.no_samp = 3;
1407 else
1408 msg->u.busparams.no_samp = 1;
1409
1410 rc = kvaser_usb_send_msg(dev, msg);
1411
1412 kfree(msg);
1413 return rc;
1414}
1415
1416static int kvaser_usb_set_mode(struct net_device *netdev,
1417 enum can_mode mode)
1418{
1419 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1420 int err;
1421
1422 switch (mode) {
1423 case CAN_MODE_START:
1424 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1425 if (err)
1426 return err;
1427 break;
1428 default:
1429 return -EOPNOTSUPP;
1430 }
1431
1432 return 0;
1433}
1434
1435static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1436 struct can_berr_counter *bec)
1437{
1438 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1439
1440 *bec = priv->bec;
1441
1442 return 0;
1443}
1444
1445static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1446{
1447 int i;
1448
1449 for (i = 0; i < dev->nchannels; i++) {
1450 if (!dev->nets[i])
1451 continue;
1452
1453 unregister_netdev(dev->nets[i]->netdev);
1454 }
1455
1456 kvaser_usb_unlink_all_urbs(dev);
1457
1458 for (i = 0; i < dev->nchannels; i++) {
1459 if (!dev->nets[i])
1460 continue;
1461
1462 free_candev(dev->nets[i]->netdev);
1463 }
1464}
1465
1466static int kvaser_usb_init_one(struct usb_interface *intf,
1467 const struct usb_device_id *id, int channel)
1468{
1469 struct kvaser_usb *dev = usb_get_intfdata(intf);
1470 struct net_device *netdev;
1471 struct kvaser_usb_net_priv *priv;
1472 int i, err;
1473
1474 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1475 if (!netdev) {
1476 dev_err(&intf->dev, "Cannot alloc candev\n");
1477 return -ENOMEM;
1478 }
1479
1480 priv = netdev_priv(netdev);
1481
1482 init_completion(&priv->start_comp);
1483 init_completion(&priv->stop_comp);
1484
1485 init_usb_anchor(&priv->tx_submitted);
1486 atomic_set(&priv->active_tx_urbs, 0);
1487
1488 for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++)
1489 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1490
1491 priv->dev = dev;
1492 priv->netdev = netdev;
1493 priv->channel = channel;
1494
1495 priv->can.state = CAN_STATE_STOPPED;
1496 priv->can.clock.freq = CAN_USB_CLOCK;
1497 priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1498 priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1499 priv->can.do_set_mode = kvaser_usb_set_mode;
1500 if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1501 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1502 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1503 if (id->driver_info & KVASER_HAS_SILENT_MODE)
1504 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1505
1506 netdev->flags |= IFF_ECHO;
1507
1508 netdev->netdev_ops = &kvaser_usb_netdev_ops;
1509
1510 SET_NETDEV_DEV(netdev, &intf->dev);
1511
1512 dev->nets[channel] = priv;
1513
1514 err = register_candev(netdev);
1515 if (err) {
1516 dev_err(&intf->dev, "Failed to register can device\n");
1517 free_candev(netdev);
1518 dev->nets[channel] = NULL;
1519 return err;
1520 }
1521
1522 netdev_dbg(netdev, "device registered\n");
1523
1524 return 0;
1525}
1526
1527static void kvaser_usb_get_endpoints(const struct usb_interface *intf,
1528 struct usb_endpoint_descriptor **in,
1529 struct usb_endpoint_descriptor **out)
1530{
1531 const struct usb_host_interface *iface_desc;
1532 struct usb_endpoint_descriptor *endpoint;
1533 int i;
1534
1535 iface_desc = &intf->altsetting[0];
1536
1537 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1538 endpoint = &iface_desc->endpoint[i].desc;
1539
1540 if (usb_endpoint_is_bulk_in(endpoint))
1541 *in = endpoint;
1542
1543 if (usb_endpoint_is_bulk_out(endpoint))
1544 *out = endpoint;
1545 }
1546}
1547
1548static int kvaser_usb_probe(struct usb_interface *intf,
1549 const struct usb_device_id *id)
1550{
1551 struct kvaser_usb *dev;
1552 int err = -ENOMEM;
1553 int i;
1554
1555 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1556 if (!dev)
1557 return -ENOMEM;
1558
1559 kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1560 if (!dev->bulk_in || !dev->bulk_out) {
1561 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1562 return err;
1563 }
1564
1565 dev->udev = interface_to_usbdev(intf);
1566
1567 init_usb_anchor(&dev->rx_submitted);
1568
1569 usb_set_intfdata(intf, dev);
1570
1571 for (i = 0; i < MAX_NET_DEVICES; i++)
1572 kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, i);
1573
1574 err = kvaser_usb_get_software_info(dev);
1575 if (err) {
1576 dev_err(&intf->dev,
1577 "Cannot get software infos, error %d\n", err);
1578 return err;
1579 }
1580
1581 err = kvaser_usb_get_card_info(dev);
1582 if (err) {
1583 dev_err(&intf->dev,
1584 "Cannot get card infos, error %d\n", err);
1585 return err;
1586 }
1587
1588 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
1589 ((dev->fw_version >> 24) & 0xff),
1590 ((dev->fw_version >> 16) & 0xff),
1591 (dev->fw_version & 0xffff));
1592
1593 for (i = 0; i < dev->nchannels; i++) {
1594 err = kvaser_usb_init_one(intf, id, i);
1595 if (err) {
1596 kvaser_usb_remove_interfaces(dev);
1597 return err;
1598 }
1599 }
1600
1601 return 0;
1602}
1603
1604static void kvaser_usb_disconnect(struct usb_interface *intf)
1605{
1606 struct kvaser_usb *dev = usb_get_intfdata(intf);
1607
1608 usb_set_intfdata(intf, NULL);
1609
1610 if (!dev)
1611 return;
1612
1613 kvaser_usb_remove_interfaces(dev);
1614}
1615
1616static struct usb_driver kvaser_usb_driver = {
1617 .name = "kvaser_usb",
1618 .probe = kvaser_usb_probe,
1619 .disconnect = kvaser_usb_disconnect,
1620 .id_table = kvaser_usb_table,
1621};
1622
1623module_usb_driver(kvaser_usb_driver);
1624
1625MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
1626MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
1627MODULE_LICENSE("GPL v2");
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