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can: c_can: Fix RX message handling, handle lost message before EOB
[linux-2.6-block.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
a90f13b2
JP		 139/* log message */
140#define KVASER_EXTENDED_FRAME BIT(31)
141
080f40a6
OS		 142struct kvaser_msg_simple {
143 u8 tid;
144 u8 channel;
145} __packed;
146
147struct kvaser_msg_cardinfo {
148 u8 tid;
149 u8 nchannels;
150 __le32 serial_number;
151 __le32 padding;
152 __le32 clock_resolution;
153 __le32 mfgdate;
154 u8 ean[8];
155 u8 hw_revision;
156 u8 usb_hs_mode;
157 __le16 padding2;
158} __packed;
159
160struct kvaser_msg_cardinfo2 {
161 u8 tid;
162 u8 channel;
163 u8 pcb_id[24];
164 __le32 oem_unlock_code;
165} __packed;
166
167struct kvaser_msg_softinfo {
168 u8 tid;
169 u8 channel;
170 __le32 sw_options;
171 __le32 fw_version;
172 __le16 max_outstanding_tx;
173 __le16 padding[9];
174} __packed;
175
176struct kvaser_msg_busparams {
177 u8 tid;
178 u8 channel;
179 __le32 bitrate;
180 u8 tseg1;
181 u8 tseg2;
182 u8 sjw;
183 u8 no_samp;
184} __packed;
185
186struct kvaser_msg_tx_can {
187 u8 channel;
188 u8 tid;
189 u8 msg[14];
190 u8 padding;
191 u8 flags;
192} __packed;
193
194struct kvaser_msg_rx_can {
195 u8 channel;
196 u8 flag;
197 __le16 time[3];
198 u8 msg[14];
199} __packed;
200
201struct kvaser_msg_chip_state_event {
202 u8 tid;
203 u8 channel;
204 __le16 time[3];
205 u8 tx_errors_count;
206 u8 rx_errors_count;
207 u8 status;
208 u8 padding[3];
209} __packed;
210
211struct kvaser_msg_tx_acknowledge {
212 u8 channel;
213 u8 tid;
214 __le16 time[3];
215 u8 flags;
216 u8 time_offset;
217} __packed;
218
219struct kvaser_msg_error_event {
220 u8 tid;
221 u8 flags;
222 __le16 time[3];
223 u8 channel;
224 u8 padding;
225 u8 tx_errors_count;
226 u8 rx_errors_count;
227 u8 status;
228 u8 error_factor;
229} __packed;
230
231struct kvaser_msg_ctrl_mode {
232 u8 tid;
233 u8 channel;
234 u8 ctrl_mode;
235 u8 padding[3];
236} __packed;
237
238struct kvaser_msg_flush_queue {
239 u8 tid;
240 u8 channel;
241 u8 flags;
242 u8 padding[3];
243} __packed;
244
245struct kvaser_msg_log_message {
246 u8 channel;
247 u8 flags;
248 __le16 time[3];
249 u8 dlc;
250 u8 time_offset;
251 __le32 id;
252 u8 data[8];
253} __packed;
254
255struct kvaser_msg {
256 u8 len;
257 u8 id;
258 union {
259 struct kvaser_msg_simple simple;
260 struct kvaser_msg_cardinfo cardinfo;
261 struct kvaser_msg_cardinfo2 cardinfo2;
262 struct kvaser_msg_softinfo softinfo;
263 struct kvaser_msg_busparams busparams;
264 struct kvaser_msg_tx_can tx_can;
265 struct kvaser_msg_rx_can rx_can;
266 struct kvaser_msg_chip_state_event chip_state_event;
267 struct kvaser_msg_tx_acknowledge tx_acknowledge;
268 struct kvaser_msg_error_event error_event;
269 struct kvaser_msg_ctrl_mode ctrl_mode;
270 struct kvaser_msg_flush_queue flush_queue;
271 struct kvaser_msg_log_message log_message;
272 } u;
273} __packed;
274
275struct kvaser_usb_tx_urb_context {
276 struct kvaser_usb_net_priv *priv;
277 u32 echo_index;
278 int dlc;
279};
280
281struct kvaser_usb {
282 struct usb_device *udev;
283 struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
284
285 struct usb_endpoint_descriptor *bulk_in, *bulk_out;
286 struct usb_anchor rx_submitted;
287
288 u32 fw_version;
289 unsigned int nchannels;
290
291 bool rxinitdone;
292 void *rxbuf[MAX_RX_URBS];
293 dma_addr_t rxbuf_dma[MAX_RX_URBS];
294};
295
296struct kvaser_usb_net_priv {
297 struct can_priv can;
298
299 atomic_t active_tx_urbs;
300 struct usb_anchor tx_submitted;
301 struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
302
303 struct completion start_comp, stop_comp;
304
305 struct kvaser_usb *dev;
306 struct net_device *netdev;
307 int channel;
308
309 struct can_berr_counter bec;
310};
311
312static const struct usb_device_id kvaser_usb_table[] = {
313 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
314 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
315 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
316 .driver_info = KVASER_HAS_TXRX_ERRORS |
317 KVASER_HAS_SILENT_MODE },
318 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
319 .driver_info = KVASER_HAS_TXRX_ERRORS |
320 KVASER_HAS_SILENT_MODE },
321 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
322 .driver_info = KVASER_HAS_TXRX_ERRORS |
323 KVASER_HAS_SILENT_MODE },
324 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
325 .driver_info = KVASER_HAS_TXRX_ERRORS |
326 KVASER_HAS_SILENT_MODE },
327 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
328 .driver_info = KVASER_HAS_TXRX_ERRORS |
329 KVASER_HAS_SILENT_MODE },
330 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
331 .driver_info = KVASER_HAS_TXRX_ERRORS |
332 KVASER_HAS_SILENT_MODE },
333 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
334 .driver_info = KVASER_HAS_TXRX_ERRORS |
335 KVASER_HAS_SILENT_MODE },
336 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
337 .driver_info = KVASER_HAS_TXRX_ERRORS |
338 KVASER_HAS_SILENT_MODE },
339 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
340 .driver_info = KVASER_HAS_TXRX_ERRORS |
341 KVASER_HAS_SILENT_MODE },
342 { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
343 .driver_info = KVASER_HAS_TXRX_ERRORS },
344 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
345 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
346 .driver_info = KVASER_HAS_TXRX_ERRORS |
347 KVASER_HAS_SILENT_MODE },
348 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
349 .driver_info = KVASER_HAS_TXRX_ERRORS },
350 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
351 .driver_info = KVASER_HAS_TXRX_ERRORS },
352 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
353 .driver_info = KVASER_HAS_TXRX_ERRORS },
354 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
355 .driver_info = KVASER_HAS_TXRX_ERRORS },
356 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
357 .driver_info = KVASER_HAS_TXRX_ERRORS },
358 { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
359 .driver_info = KVASER_HAS_TXRX_ERRORS },
360 { }
361};
362MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
363
364static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
365 struct kvaser_msg *msg)
366{
367 int actual_len;
368
369 return usb_bulk_msg(dev->udev,
370 usb_sndbulkpipe(dev->udev,
371 dev->bulk_out->bEndpointAddress),
372 msg, msg->len, &actual_len,
373 USB_SEND_TIMEOUT);
374}
375
376static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
377 struct kvaser_msg *msg)
378{
379 struct kvaser_msg *tmp;
380 void *buf;
381 int actual_len;
382 int err;
383 int pos = 0;
384
385 buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
386 if (!buf)
387 return -ENOMEM;
388
389 err = usb_bulk_msg(dev->udev,
390 usb_rcvbulkpipe(dev->udev,
391 dev->bulk_in->bEndpointAddress),
392 buf, RX_BUFFER_SIZE, &actual_len,
393 USB_RECV_TIMEOUT);
394 if (err < 0)
395 goto end;
396
397 while (pos <= actual_len - MSG_HEADER_LEN) {
398 tmp = buf + pos;
399
400 if (!tmp->len)
401 break;
402
403 if (pos + tmp->len > actual_len) {
404 dev_err(dev->udev->dev.parent, "Format error\n");
405 break;
406 }
407
408 if (tmp->id == id) {
409 memcpy(msg, tmp, tmp->len);
410 goto end;
411 }
412
413 pos += tmp->len;
414 }
415
416 err = -EINVAL;
417
418end:
419 kfree(buf);
420
421 return err;
422}
423
424static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
425 u8 msg_id, int channel)
426{
427 struct kvaser_msg *msg;
428 int rc;
429
430 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
431 if (!msg)
432 return -ENOMEM;
433
434 msg->id = msg_id;
435 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
436 msg->u.simple.channel = channel;
437 msg->u.simple.tid = 0xff;
438
439 rc = kvaser_usb_send_msg(dev, msg);
440
441 kfree(msg);
442 return rc;
443}
444
445static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
446{
447 struct kvaser_msg msg;
448 int err;
449
450 err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
451 if (err)
452 return err;
453
454 err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
455 if (err)
456 return err;
457
458 dev->fw_version = le32_to_cpu(msg.u.softinfo.fw_version);
459
460 return 0;
461}
462
463static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
464{
465 struct kvaser_msg msg;
466 int err;
467
468 err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
469 if (err)
470 return err;
471
472 err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
473 if (err)
474 return err;
475
476 dev->nchannels = msg.u.cardinfo.nchannels;
477
478 return 0;
479}
480
481static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
482 const struct kvaser_msg *msg)
483{
484 struct net_device_stats *stats;
485 struct kvaser_usb_tx_urb_context *context;
486 struct kvaser_usb_net_priv *priv;
487 struct sk_buff *skb;
488 struct can_frame *cf;
489 u8 channel = msg->u.tx_acknowledge.channel;
490 u8 tid = msg->u.tx_acknowledge.tid;
491
492 if (channel >= dev->nchannels) {
493 dev_err(dev->udev->dev.parent,
494 "Invalid channel number (%d)\n", channel);
495 return;
496 }
497
498 priv = dev->nets[channel];
499
500 if (!netif_device_present(priv->netdev))
501 return;
502
503 stats = &priv->netdev->stats;
504
505 context = &priv->tx_contexts[tid % MAX_TX_URBS];
506
507 /* Sometimes the state change doesn't come after a bus-off event */
508 if (priv->can.restart_ms &&
509 (priv->can.state >= CAN_STATE_BUS_OFF)) {
510 skb = alloc_can_err_skb(priv->netdev, &cf);
511 if (skb) {
512 cf->can_id |= CAN_ERR_RESTARTED;
513 netif_rx(skb);
514
515 stats->rx_packets++;
516 stats->rx_bytes += cf->can_dlc;
517 } else {
518 netdev_err(priv->netdev,
519 "No memory left for err_skb\n");
520 }
521
522 priv->can.can_stats.restarts++;
523 netif_carrier_on(priv->netdev);
524
525 priv->can.state = CAN_STATE_ERROR_ACTIVE;
526 }
527
528 stats->tx_packets++;
529 stats->tx_bytes += context->dlc;
530 can_get_echo_skb(priv->netdev, context->echo_index);
531
532 context->echo_index = MAX_TX_URBS;
533 atomic_dec(&priv->active_tx_urbs);
534
535 netif_wake_queue(priv->netdev);
536}
537
538static void kvaser_usb_simple_msg_callback(struct urb *urb)
539{
540 struct net_device *netdev = urb->context;
541
542 kfree(urb->transfer_buffer);
543
544 if (urb->status)
545 netdev_warn(netdev, "urb status received: %d\n",
546 urb->status);
547}
548
549static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
550 u8 msg_id)
551{
552 struct kvaser_usb *dev = priv->dev;
553 struct net_device *netdev = priv->netdev;
554 struct kvaser_msg *msg;
555 struct urb *urb;
556 void *buf;
557 int err;
558
559 urb = usb_alloc_urb(0, GFP_ATOMIC);
560 if (!urb) {
561 netdev_err(netdev, "No memory left for URBs\n");
562 return -ENOMEM;
563 }
564
565 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
566 if (!buf) {
080f40a6
OS		 567 usb_free_urb(urb);
568 return -ENOMEM;
569 }
570
571 msg = (struct kvaser_msg *)buf;
572 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
573 msg->id = msg_id;
574 msg->u.simple.channel = priv->channel;
575
576 usb_fill_bulk_urb(urb, dev->udev,
577 usb_sndbulkpipe(dev->udev,
578 dev->bulk_out->bEndpointAddress),
579 buf, msg->len,
580 kvaser_usb_simple_msg_callback, priv);
581 usb_anchor_urb(urb, &priv->tx_submitted);
582
583 err = usb_submit_urb(urb, GFP_ATOMIC);
584 if (err) {
585 netdev_err(netdev, "Error transmitting URB\n");
586 usb_unanchor_urb(urb);
587 usb_free_urb(urb);
588 kfree(buf);
589 return err;
590 }
591
592 usb_free_urb(urb);
593
594 return 0;
595}
596
597static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
598{
599 int i;
600
601 usb_kill_anchored_urbs(&priv->tx_submitted);
602 atomic_set(&priv->active_tx_urbs, 0);
603
604 for (i = 0; i < MAX_TX_URBS; i++)
605 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
606}
607
608static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
609 const struct kvaser_msg *msg)
610{
611 struct can_frame *cf;
612 struct sk_buff *skb;
613 struct net_device_stats *stats;
614 struct kvaser_usb_net_priv *priv;
615 unsigned int new_state;
616 u8 channel, status, txerr, rxerr, error_factor;
617
618 switch (msg->id) {
619 case CMD_CAN_ERROR_EVENT:
620 channel = msg->u.error_event.channel;
621 status = msg->u.error_event.status;
622 txerr = msg->u.error_event.tx_errors_count;
623 rxerr = msg->u.error_event.rx_errors_count;
624 error_factor = msg->u.error_event.error_factor;
625 break;
626 case CMD_LOG_MESSAGE:
627 channel = msg->u.log_message.channel;
628 status = msg->u.log_message.data[0];
629 txerr = msg->u.log_message.data[2];
630 rxerr = msg->u.log_message.data[3];
631 error_factor = msg->u.log_message.data[1];
632 break;
633 case CMD_CHIP_STATE_EVENT:
634 channel = msg->u.chip_state_event.channel;
635 status = msg->u.chip_state_event.status;
636 txerr = msg->u.chip_state_event.tx_errors_count;
637 rxerr = msg->u.chip_state_event.rx_errors_count;
638 error_factor = 0;
639 break;
640 default:
641 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
642 msg->id);
643 return;
644 }
645
646 if (channel >= dev->nchannels) {
647 dev_err(dev->udev->dev.parent,
648 "Invalid channel number (%d)\n", channel);
649 return;
650 }
651
652 priv = dev->nets[channel];
653 stats = &priv->netdev->stats;
654
655 if (status & M16C_STATE_BUS_RESET) {
656 kvaser_usb_unlink_tx_urbs(priv);
657 return;
658 }
659
660 skb = alloc_can_err_skb(priv->netdev, &cf);
661 if (!skb) {
662 stats->rx_dropped++;
663 return;
664 }
665
666 new_state = priv->can.state;
667
668 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", status);
669
670 if (status & M16C_STATE_BUS_OFF) {
671 cf->can_id |= CAN_ERR_BUSOFF;
672
673 priv->can.can_stats.bus_off++;
674 if (!priv->can.restart_ms)
675 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
676
677 netif_carrier_off(priv->netdev);
678
679 new_state = CAN_STATE_BUS_OFF;
680 } else if (status & M16C_STATE_BUS_PASSIVE) {
681 if (priv->can.state != CAN_STATE_ERROR_PASSIVE) {
682 cf->can_id |= CAN_ERR_CRTL;
683
684 if (txerr || rxerr)
685 cf->data[1] = (txerr > rxerr)
686 ? CAN_ERR_CRTL_TX_PASSIVE
687 : CAN_ERR_CRTL_RX_PASSIVE;
688 else
689 cf->data[1] = CAN_ERR_CRTL_TX_PASSIVE |
690 CAN_ERR_CRTL_RX_PASSIVE;
691
692 priv->can.can_stats.error_passive++;
693 }
694
695 new_state = CAN_STATE_ERROR_PASSIVE;
696 }
697
698 if (status == M16C_STATE_BUS_ERROR) {
699 if ((priv->can.state < CAN_STATE_ERROR_WARNING) &&
700 ((txerr >= 96) || (rxerr >= 96))) {
701 cf->can_id |= CAN_ERR_CRTL;
702 cf->data[1] = (txerr > rxerr)
703 ? CAN_ERR_CRTL_TX_WARNING
704 : CAN_ERR_CRTL_RX_WARNING;
705
706 priv->can.can_stats.error_warning++;
707 new_state = CAN_STATE_ERROR_WARNING;
708 } else if (priv->can.state > CAN_STATE_ERROR_ACTIVE) {
709 cf->can_id |= CAN_ERR_PROT;
710 cf->data[2] = CAN_ERR_PROT_ACTIVE;
711
712 new_state = CAN_STATE_ERROR_ACTIVE;
713 }
714 }
715
716 if (!status) {
717 cf->can_id |= CAN_ERR_PROT;
718 cf->data[2] = CAN_ERR_PROT_ACTIVE;
719
720 new_state = CAN_STATE_ERROR_ACTIVE;
721 }
722
723 if (priv->can.restart_ms &&
724 (priv->can.state >= CAN_STATE_BUS_OFF) &&
725 (new_state < CAN_STATE_BUS_OFF)) {
726 cf->can_id |= CAN_ERR_RESTARTED;
727 netif_carrier_on(priv->netdev);
728
729 priv->can.can_stats.restarts++;
730 }
731
732 if (error_factor) {
733 priv->can.can_stats.bus_error++;
734 stats->rx_errors++;
735
736 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
737
738 if (error_factor & M16C_EF_ACKE)
739 cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
740 if (error_factor & M16C_EF_CRCE)
741 cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
742 CAN_ERR_PROT_LOC_CRC_DEL);
743 if (error_factor & M16C_EF_FORME)
744 cf->data[2] |= CAN_ERR_PROT_FORM;
745 if (error_factor & M16C_EF_STFE)
746 cf->data[2] |= CAN_ERR_PROT_STUFF;
747 if (error_factor & M16C_EF_BITE0)
748 cf->data[2] |= CAN_ERR_PROT_BIT0;
749 if (error_factor & M16C_EF_BITE1)
750 cf->data[2] |= CAN_ERR_PROT_BIT1;
751 if (error_factor & M16C_EF_TRE)
752 cf->data[2] |= CAN_ERR_PROT_TX;
753 }
754
755 cf->data[6] = txerr;
756 cf->data[7] = rxerr;
757
758 priv->bec.txerr = txerr;
759 priv->bec.rxerr = rxerr;
760
761 priv->can.state = new_state;
762
763 netif_rx(skb);
764
765 stats->rx_packets++;
766 stats->rx_bytes += cf->can_dlc;
767}
768
769static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
770 const struct kvaser_msg *msg)
771{
772 struct can_frame *cf;
773 struct sk_buff *skb;
774 struct net_device_stats *stats = &priv->netdev->stats;
775
776 if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
777 MSG_FLAG_NERR)) {
778 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
779 msg->u.rx_can.flag);
780
781 stats->rx_errors++;
782 return;
783 }
784
785 if (msg->u.rx_can.flag & MSG_FLAG_OVERRUN) {
786 skb = alloc_can_err_skb(priv->netdev, &cf);
787 if (!skb) {
788 stats->rx_dropped++;
789 return;
790 }
791
792 cf->can_id |= CAN_ERR_CRTL;
793 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
794
795 stats->rx_over_errors++;
796 stats->rx_errors++;
797
798 netif_rx(skb);
799
800 stats->rx_packets++;
801 stats->rx_bytes += cf->can_dlc;
802 }
803}
804
805static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
806 const struct kvaser_msg *msg)
807{
808 struct kvaser_usb_net_priv *priv;
809 struct can_frame *cf;
810 struct sk_buff *skb;
811 struct net_device_stats *stats;
812 u8 channel = msg->u.rx_can.channel;
813
814 if (channel >= dev->nchannels) {
815 dev_err(dev->udev->dev.parent,
816 "Invalid channel number (%d)\n", channel);
817 return;
818 }
819
820 priv = dev->nets[channel];
821 stats = &priv->netdev->stats;
822
a90f13b2
JP		 823 if ((msg->u.rx_can.flag & MSG_FLAG_ERROR_FRAME) &&
824 (msg->id == CMD_LOG_MESSAGE)) {
825 kvaser_usb_rx_error(dev, msg);
826 return;
827 } else if (msg->u.rx_can.flag & (MSG_FLAG_ERROR_FRAME |
828 MSG_FLAG_NERR |
829 MSG_FLAG_OVERRUN)) {
080f40a6
OS		 830 kvaser_usb_rx_can_err(priv, msg);
831 return;
832 } else if (msg->u.rx_can.flag & ~MSG_FLAG_REMOTE_FRAME) {
833 netdev_warn(priv->netdev,
834 "Unhandled frame (flags: 0x%02x)",
835 msg->u.rx_can.flag);
836 return;
837 }
838
839 skb = alloc_can_skb(priv->netdev, &cf);
840 if (!skb) {
841 stats->tx_dropped++;
842 return;
843 }
844
a90f13b2
JP		 845 if (msg->id == CMD_LOG_MESSAGE) {
846 cf->can_id = le32_to_cpu(msg->u.log_message.id);
847 if (cf->can_id & KVASER_EXTENDED_FRAME)
848 cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
849 else
850 cf->can_id &= CAN_SFF_MASK;
080f40a6 851
a90f13b2
JP		 852 cf->can_dlc = get_can_dlc(msg->u.log_message.dlc);
853
854 if (msg->u.log_message.flags & MSG_FLAG_REMOTE_FRAME)
855 cf->can_id |= CAN_RTR_FLAG;
856 else
857 memcpy(cf->data, &msg->u.log_message.data,
858 cf->can_dlc);
859 } else {
860 cf->can_id = ((msg->u.rx_can.msg[0] & 0x1f) << 6) |
861 (msg->u.rx_can.msg[1] & 0x3f);
862
863 if (msg->id == CMD_RX_EXT_MESSAGE) {
864 cf->can_id <<= 18;
865 cf->can_id |= ((msg->u.rx_can.msg[2] & 0x0f) << 14) |
866 ((msg->u.rx_can.msg[3] & 0xff) << 6) |
867 (msg->u.rx_can.msg[4] & 0x3f);
868 cf->can_id |= CAN_EFF_FLAG;
869 }
080f40a6 870
a90f13b2
JP		 871 cf->can_dlc = get_can_dlc(msg->u.rx_can.msg[5]);
872
873 if (msg->u.rx_can.flag & MSG_FLAG_REMOTE_FRAME)
874 cf->can_id |= CAN_RTR_FLAG;
875 else
876 memcpy(cf->data, &msg->u.rx_can.msg[6],
877 cf->can_dlc);
878 }
080f40a6
OS		 879
880 netif_rx(skb);
881
882 stats->rx_packets++;
883 stats->rx_bytes += cf->can_dlc;
884}
885
886static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
887 const struct kvaser_msg *msg)
888{
889 struct kvaser_usb_net_priv *priv;
890 u8 channel = msg->u.simple.channel;
891
892 if (channel >= dev->nchannels) {
893 dev_err(dev->udev->dev.parent,
894 "Invalid channel number (%d)\n", channel);
895 return;
896 }
897
898 priv = dev->nets[channel];
899
900 if (completion_done(&priv->start_comp) &&
901 netif_queue_stopped(priv->netdev)) {
902 netif_wake_queue(priv->netdev);
903 } else {
904 netif_start_queue(priv->netdev);
905 complete(&priv->start_comp);
906 }
907}
908
909static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
910 const struct kvaser_msg *msg)
911{
912 struct kvaser_usb_net_priv *priv;
913 u8 channel = msg->u.simple.channel;
914
915 if (channel >= dev->nchannels) {
916 dev_err(dev->udev->dev.parent,
917 "Invalid channel number (%d)\n", channel);
918 return;
919 }
920
921 priv = dev->nets[channel];
922
923 complete(&priv->stop_comp);
924}
925
926static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
927 const struct kvaser_msg *msg)
928{
929 switch (msg->id) {
930 case CMD_START_CHIP_REPLY:
931 kvaser_usb_start_chip_reply(dev, msg);
932 break;
933
934 case CMD_STOP_CHIP_REPLY:
935 kvaser_usb_stop_chip_reply(dev, msg);
936 break;
937
938 case CMD_RX_STD_MESSAGE:
939 case CMD_RX_EXT_MESSAGE:
a90f13b2 940 case CMD_LOG_MESSAGE:
080f40a6
OS		 941 kvaser_usb_rx_can_msg(dev, msg);
942 break;
943
944 case CMD_CHIP_STATE_EVENT:
945 case CMD_CAN_ERROR_EVENT:
946 kvaser_usb_rx_error(dev, msg);
947 break;
948
080f40a6
OS		 949 case CMD_TX_ACKNOWLEDGE:
950 kvaser_usb_tx_acknowledge(dev, msg);
951 break;
952
953 default:
954 dev_warn(dev->udev->dev.parent,
955 "Unhandled message (%d)\n", msg->id);
956 break;
957 }
958}
959
960static void kvaser_usb_read_bulk_callback(struct urb *urb)
961{
962 struct kvaser_usb *dev = urb->context;
963 struct kvaser_msg *msg;
964 int pos = 0;
965 int err, i;
966
967 switch (urb->status) {
968 case 0:
969 break;
970 case -ENOENT:
971 case -ESHUTDOWN:
972 return;
973 default:
974 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
975 urb->status);
976 goto resubmit_urb;
977 }
978
979 while (pos <= urb->actual_length - MSG_HEADER_LEN) {
980 msg = urb->transfer_buffer + pos;
981
982 if (!msg->len)
983 break;
984
985 if (pos + msg->len > urb->actual_length) {
986 dev_err(dev->udev->dev.parent, "Format error\n");
987 break;
988 }
989
990 kvaser_usb_handle_message(dev, msg);
991
992 pos += msg->len;
993 }
994
995resubmit_urb:
996 usb_fill_bulk_urb(urb, dev->udev,
997 usb_rcvbulkpipe(dev->udev,
998 dev->bulk_in->bEndpointAddress),
999 urb->transfer_buffer, RX_BUFFER_SIZE,
1000 kvaser_usb_read_bulk_callback, dev);
1001
1002 err = usb_submit_urb(urb, GFP_ATOMIC);
1003 if (err == -ENODEV) {
1004 for (i = 0; i < dev->nchannels; i++) {
1005 if (!dev->nets[i])
1006 continue;
1007
1008 netif_device_detach(dev->nets[i]->netdev);
1009 }
1010 } else if (err) {
1011 dev_err(dev->udev->dev.parent,
1012 "Failed resubmitting read bulk urb: %d\n", err);
1013 }
1014
1015 return;
1016}
1017
1018static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1019{
1020 int i, err = 0;
1021
1022 if (dev->rxinitdone)
1023 return 0;
1024
1025 for (i = 0; i < MAX_RX_URBS; i++) {
1026 struct urb *urb = NULL;
1027 u8 *buf = NULL;
1028 dma_addr_t buf_dma;
1029
1030 urb = usb_alloc_urb(0, GFP_KERNEL);
1031 if (!urb) {
1032 dev_warn(dev->udev->dev.parent,
1033 "No memory left for URBs\n");
1034 err = -ENOMEM;
1035 break;
1036 }
1037
1038 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1039 GFP_KERNEL, &buf_dma);
1040 if (!buf) {
1041 dev_warn(dev->udev->dev.parent,
1042 "No memory left for USB buffer\n");
1043 usb_free_urb(urb);
1044 err = -ENOMEM;
1045 break;
1046 }
1047
1048 usb_fill_bulk_urb(urb, dev->udev,
1049 usb_rcvbulkpipe(dev->udev,
1050 dev->bulk_in->bEndpointAddress),
1051 buf, RX_BUFFER_SIZE,
1052 kvaser_usb_read_bulk_callback,
1053 dev);
1054 urb->transfer_dma = buf_dma;
1055 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1056 usb_anchor_urb(urb, &dev->rx_submitted);
1057
1058 err = usb_submit_urb(urb, GFP_KERNEL);
1059 if (err) {
1060 usb_unanchor_urb(urb);
1061 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1062 buf_dma);
1063 usb_free_urb(urb);
1064 break;
1065 }
1066
1067 dev->rxbuf[i] = buf;
1068 dev->rxbuf_dma[i] = buf_dma;
1069
1070 usb_free_urb(urb);
1071 }
1072
1073 if (i == 0) {
1074 dev_warn(dev->udev->dev.parent,
1075 "Cannot setup read URBs, error %d\n", err);
1076 return err;
1077 } else if (i < MAX_RX_URBS) {
1078 dev_warn(dev->udev->dev.parent,
1079 "RX performances may be slow\n");
1080 }
1081
1082 dev->rxinitdone = true;
1083
1084 return 0;
1085}
1086
1087static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1088{
1089 struct kvaser_msg *msg;
1090 int rc;
1091
1092 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1093 if (!msg)
1094 return -ENOMEM;
1095
1096 msg->id = CMD_SET_CTRL_MODE;
1097 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1098 msg->u.ctrl_mode.tid = 0xff;
1099 msg->u.ctrl_mode.channel = priv->channel;
1100
1101 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1102 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1103 else
1104 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1105
1106 rc = kvaser_usb_send_msg(priv->dev, msg);
1107
1108 kfree(msg);
1109 return rc;
1110}
1111
1112static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1113{
1114 int err;
1115
1116 init_completion(&priv->start_comp);
1117
1118 err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1119 priv->channel);
1120 if (err)
1121 return err;
1122
1123 if (!wait_for_completion_timeout(&priv->start_comp,
1124 msecs_to_jiffies(START_TIMEOUT)))
1125 return -ETIMEDOUT;
1126
1127 return 0;
1128}
1129
1130static int kvaser_usb_open(struct net_device *netdev)
1131{
1132 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1133 struct kvaser_usb *dev = priv->dev;
1134 int err;
1135
1136 err = open_candev(netdev);
1137 if (err)
1138 return err;
1139
1140 err = kvaser_usb_setup_rx_urbs(dev);
1141 if (err)
1142 goto error;
1143
1144 err = kvaser_usb_set_opt_mode(priv);
1145 if (err)
1146 goto error;
1147
1148 err = kvaser_usb_start_chip(priv);
1149 if (err) {
1150 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1151 goto error;
1152 }
1153
1154 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1155
1156 return 0;
1157
1158error:
1159 close_candev(netdev);
1160 return err;
1161}
1162
1163static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1164{
1165 int i;
1166
1167 usb_kill_anchored_urbs(&dev->rx_submitted);
1168
1169 for (i = 0; i < MAX_RX_URBS; i++)
1170 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1171 dev->rxbuf[i],
1172 dev->rxbuf_dma[i]);
1173
1174 for (i = 0; i < MAX_NET_DEVICES; i++) {
1175 struct kvaser_usb_net_priv *priv = dev->nets[i];
1176
1177 if (priv)
1178 kvaser_usb_unlink_tx_urbs(priv);
1179 }
1180}
1181
1182static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1183{
1184 int err;
1185
1186 init_completion(&priv->stop_comp);
1187
1188 err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1189 priv->channel);
1190 if (err)
1191 return err;
1192
1193 if (!wait_for_completion_timeout(&priv->stop_comp,
1194 msecs_to_jiffies(STOP_TIMEOUT)))
1195 return -ETIMEDOUT;
1196
1197 return 0;
1198}
1199
1200static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1201{
1202 struct kvaser_msg *msg;
1203 int rc;
1204
1205 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1206 if (!msg)
1207 return -ENOMEM;
1208
1209 msg->id = CMD_FLUSH_QUEUE;
1210 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1211 msg->u.flush_queue.channel = priv->channel;
1212 msg->u.flush_queue.flags = 0x00;
1213
1214 rc = kvaser_usb_send_msg(priv->dev, msg);
1215
1216 kfree(msg);
1217 return rc;
1218}
1219
1220static int kvaser_usb_close(struct net_device *netdev)
1221{
1222 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1223 struct kvaser_usb *dev = priv->dev;
1224 int err;
1225
1226 netif_stop_queue(netdev);
1227
1228 err = kvaser_usb_flush_queue(priv);
1229 if (err)
1230 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1231
1232 if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1233 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1234
1235 err = kvaser_usb_stop_chip(priv);
1236 if (err)
1237 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1238
1239 priv->can.state = CAN_STATE_STOPPED;
1240 close_candev(priv->netdev);
1241
1242 return 0;
1243}
1244
1245static void kvaser_usb_write_bulk_callback(struct urb *urb)
1246{
1247 struct kvaser_usb_tx_urb_context *context = urb->context;
1248 struct kvaser_usb_net_priv *priv;
1249 struct net_device *netdev;
1250
1251 if (WARN_ON(!context))
1252 return;
1253
1254 priv = context->priv;
1255 netdev = priv->netdev;
1256
1257 kfree(urb->transfer_buffer);
1258
1259 if (!netif_device_present(netdev))
1260 return;
1261
1262 if (urb->status)
1263 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1264}
1265
1266static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1267 struct net_device *netdev)
1268{
1269 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1270 struct kvaser_usb *dev = priv->dev;
1271 struct net_device_stats *stats = &netdev->stats;
1272 struct can_frame *cf = (struct can_frame *)skb->data;
1273 struct kvaser_usb_tx_urb_context *context = NULL;
1274 struct urb *urb;
1275 void *buf;
1276 struct kvaser_msg *msg;
1277 int i, err;
1278 int ret = NETDEV_TX_OK;
1279
1280 if (can_dropped_invalid_skb(netdev, skb))
1281 return NETDEV_TX_OK;
1282
1283 urb = usb_alloc_urb(0, GFP_ATOMIC);
1284 if (!urb) {
1285 netdev_err(netdev, "No memory left for URBs\n");
1286 stats->tx_dropped++;
1287 goto nourbmem;
1288 }
1289
1290 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1291 if (!buf) {
080f40a6
OS		 1292 stats->tx_dropped++;
1293 goto nobufmem;
1294 }
1295
1296 msg = buf;
1297 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1298 msg->u.tx_can.flags = 0;
1299 msg->u.tx_can.channel = priv->channel;
1300
1301 if (cf->can_id & CAN_EFF_FLAG) {
1302 msg->id = CMD_TX_EXT_MESSAGE;
1303 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1304 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1305 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1306 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1307 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1308 } else {
1309 msg->id = CMD_TX_STD_MESSAGE;
1310 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1311 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1312 }
1313
1314 msg->u.tx_can.msg[5] = cf->can_dlc;
1315 memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1316
1317 if (cf->can_id & CAN_RTR_FLAG)
1318 msg->u.tx_can.flags |= MSG_FLAG_REMOTE_FRAME;
1319
1320 for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1321 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1322 context = &priv->tx_contexts[i];
1323 break;
1324 }
1325 }
1326
1327 if (!context) {
1328 netdev_warn(netdev, "cannot find free context\n");
1329 ret = NETDEV_TX_BUSY;
1330 goto releasebuf;
1331 }
1332
1333 context->priv = priv;
1334 context->echo_index = i;
1335 context->dlc = cf->can_dlc;
1336
1337 msg->u.tx_can.tid = context->echo_index;
1338
1339 usb_fill_bulk_urb(urb, dev->udev,
1340 usb_sndbulkpipe(dev->udev,
1341 dev->bulk_out->bEndpointAddress),
1342 buf, msg->len,
1343 kvaser_usb_write_bulk_callback, context);
1344 usb_anchor_urb(urb, &priv->tx_submitted);
1345
1346 can_put_echo_skb(skb, netdev, context->echo_index);
1347
1348 atomic_inc(&priv->active_tx_urbs);
1349
1350 if (atomic_read(&priv->active_tx_urbs) >= MAX_TX_URBS)
1351 netif_stop_queue(netdev);
1352
1353 err = usb_submit_urb(urb, GFP_ATOMIC);
1354 if (unlikely(err)) {
1355 can_free_echo_skb(netdev, context->echo_index);
1356
1357 skb = NULL; /* set to NULL to avoid double free in
1358 * dev_kfree_skb(skb) */
1359
1360 atomic_dec(&priv->active_tx_urbs);
1361 usb_unanchor_urb(urb);
1362
1363 stats->tx_dropped++;
1364
1365 if (err == -ENODEV)
1366 netif_device_detach(netdev);
1367 else
1368 netdev_warn(netdev, "Failed tx_urb %d\n", err);
1369
1370 goto releasebuf;
1371 }
1372
1373 usb_free_urb(urb);
1374
1375 return NETDEV_TX_OK;
1376
1377releasebuf:
1378 kfree(buf);
1379nobufmem:
1380 usb_free_urb(urb);
1381nourbmem:
1382 dev_kfree_skb(skb);
1383 return ret;
1384}
1385
1386static const struct net_device_ops kvaser_usb_netdev_ops = {
1387 .ndo_open = kvaser_usb_open,
1388 .ndo_stop = kvaser_usb_close,
1389 .ndo_start_xmit = kvaser_usb_start_xmit,
1390};
1391
1392static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1393 .name = "kvaser_usb",
1394 .tseg1_min = KVASER_USB_TSEG1_MIN,
1395 .tseg1_max = KVASER_USB_TSEG1_MAX,
1396 .tseg2_min = KVASER_USB_TSEG2_MIN,
1397 .tseg2_max = KVASER_USB_TSEG2_MAX,
1398 .sjw_max = KVASER_USB_SJW_MAX,
1399 .brp_min = KVASER_USB_BRP_MIN,
1400 .brp_max = KVASER_USB_BRP_MAX,
1401 .brp_inc = KVASER_USB_BRP_INC,
1402};
1403
1404static int kvaser_usb_set_bittiming(struct net_device *netdev)
1405{
1406 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1407 struct can_bittiming *bt = &priv->can.bittiming;
1408 struct kvaser_usb *dev = priv->dev;
1409 struct kvaser_msg *msg;
1410 int rc;
1411
1412 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1413 if (!msg)
1414 return -ENOMEM;
1415
1416 msg->id = CMD_SET_BUS_PARAMS;
1417 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1418 msg->u.busparams.channel = priv->channel;
1419 msg->u.busparams.tid = 0xff;
1420 msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1421 msg->u.busparams.sjw = bt->sjw;
1422 msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1423 msg->u.busparams.tseg2 = bt->phase_seg2;
1424
1425 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1426 msg->u.busparams.no_samp = 3;
1427 else
1428 msg->u.busparams.no_samp = 1;
1429
1430 rc = kvaser_usb_send_msg(dev, msg);
1431
1432 kfree(msg);
1433 return rc;
1434}
1435
1436static int kvaser_usb_set_mode(struct net_device *netdev,
1437 enum can_mode mode)
1438{
1439 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1440 int err;
1441
1442 switch (mode) {
1443 case CAN_MODE_START:
1444 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1445 if (err)
1446 return err;
1447 break;
1448 default:
1449 return -EOPNOTSUPP;
1450 }
1451
1452 return 0;
1453}
1454
1455static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1456 struct can_berr_counter *bec)
1457{
1458 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1459
1460 *bec = priv->bec;
1461
1462 return 0;
1463}
1464
1465static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1466{
1467 int i;
1468
1469 for (i = 0; i < dev->nchannels; i++) {
1470 if (!dev->nets[i])
1471 continue;
1472
1473 unregister_netdev(dev->nets[i]->netdev);
1474 }
1475
1476 kvaser_usb_unlink_all_urbs(dev);
1477
1478 for (i = 0; i < dev->nchannels; i++) {
1479 if (!dev->nets[i])
1480 continue;
1481
1482 free_candev(dev->nets[i]->netdev);
1483 }
1484}
1485
1486static int kvaser_usb_init_one(struct usb_interface *intf,
1487 const struct usb_device_id *id, int channel)
1488{
1489 struct kvaser_usb *dev = usb_get_intfdata(intf);
1490 struct net_device *netdev;
1491 struct kvaser_usb_net_priv *priv;
1492 int i, err;
1493
1494 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1495 if (!netdev) {
1496 dev_err(&intf->dev, "Cannot alloc candev\n");
1497 return -ENOMEM;
1498 }
1499
1500 priv = netdev_priv(netdev);
1501
1502 init_completion(&priv->start_comp);
1503 init_completion(&priv->stop_comp);
1504
1505 init_usb_anchor(&priv->tx_submitted);
1506 atomic_set(&priv->active_tx_urbs, 0);
1507
1508 for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++)
1509 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1510
1511 priv->dev = dev;
1512 priv->netdev = netdev;
1513 priv->channel = channel;
1514
1515 priv->can.state = CAN_STATE_STOPPED;
1516 priv->can.clock.freq = CAN_USB_CLOCK;
1517 priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1518 priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1519 priv->can.do_set_mode = kvaser_usb_set_mode;
1520 if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1521 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1522 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1523 if (id->driver_info & KVASER_HAS_SILENT_MODE)
1524 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1525
1526 netdev->flags |= IFF_ECHO;
1527
1528 netdev->netdev_ops = &kvaser_usb_netdev_ops;
1529
1530 SET_NETDEV_DEV(netdev, &intf->dev);
1531
1532 dev->nets[channel] = priv;
1533
1534 err = register_candev(netdev);
1535 if (err) {
1536 dev_err(&intf->dev, "Failed to register can device\n");
1537 free_candev(netdev);
1538 dev->nets[channel] = NULL;
1539 return err;
1540 }
1541
1542 netdev_dbg(netdev, "device registered\n");
1543
1544 return 0;
1545}
1546
1547static void kvaser_usb_get_endpoints(const struct usb_interface *intf,
1548 struct usb_endpoint_descriptor **in,
1549 struct usb_endpoint_descriptor **out)
1550{
1551 const struct usb_host_interface *iface_desc;
1552 struct usb_endpoint_descriptor *endpoint;
1553 int i;
1554
1555 iface_desc = &intf->altsetting[0];
1556
1557 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1558 endpoint = &iface_desc->endpoint[i].desc;
1559
1560 if (usb_endpoint_is_bulk_in(endpoint))
1561 *in = endpoint;
1562
1563 if (usb_endpoint_is_bulk_out(endpoint))
1564 *out = endpoint;
1565 }
1566}
1567
1568static int kvaser_usb_probe(struct usb_interface *intf,
1569 const struct usb_device_id *id)
1570{
1571 struct kvaser_usb *dev;
1572 int err = -ENOMEM;
1573 int i;
1574
1575 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1576 if (!dev)
1577 return -ENOMEM;
1578
1579 kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1580 if (!dev->bulk_in || !dev->bulk_out) {
1581 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1582 return err;
1583 }
1584
1585 dev->udev = interface_to_usbdev(intf);
1586
1587 init_usb_anchor(&dev->rx_submitted);
1588
1589 usb_set_intfdata(intf, dev);
1590
1591 for (i = 0; i < MAX_NET_DEVICES; i++)
1592 kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, i);
1593
1594 err = kvaser_usb_get_software_info(dev);
1595 if (err) {
1596 dev_err(&intf->dev,
1597 "Cannot get software infos, error %d\n", err);
1598 return err;
1599 }
1600
1601 err = kvaser_usb_get_card_info(dev);
1602 if (err) {
1603 dev_err(&intf->dev,
1604 "Cannot get card infos, error %d\n", err);
1605 return err;
1606 }
1607
1608 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
1609 ((dev->fw_version >> 24) & 0xff),
1610 ((dev->fw_version >> 16) & 0xff),
1611 (dev->fw_version & 0xffff));
1612
1613 for (i = 0; i < dev->nchannels; i++) {
1614 err = kvaser_usb_init_one(intf, id, i);
1615 if (err) {
1616 kvaser_usb_remove_interfaces(dev);
1617 return err;
1618 }
1619 }
1620
1621 return 0;
1622}
1623
1624static void kvaser_usb_disconnect(struct usb_interface *intf)
1625{
1626 struct kvaser_usb *dev = usb_get_intfdata(intf);
1627
1628 usb_set_intfdata(intf, NULL);
1629
1630 if (!dev)
1631 return;
1632
1633 kvaser_usb_remove_interfaces(dev);
1634}
1635
1636static struct usb_driver kvaser_usb_driver = {
1637 .name = "kvaser_usb",
1638 .probe = kvaser_usb_probe,
1639 .disconnect = kvaser_usb_disconnect,
1640 .id_table = kvaser_usb_table,
1641};
1642
1643module_usb_driver(kvaser_usb_driver);
1644
1645MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
1646MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
1647MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)