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Merge tag 'mfd-fixes-4.0' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
[deliverable/linux.git] / drivers / net / can / usb / kvaser_usb.c
1 /*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License as
4 * published by the Free Software Foundation version 2.
5 *
6 * Parts of this driver are based on the following:
7 * - Kvaser linux leaf driver (version 4.78)
8 * - CAN driver for esd CAN-USB/2
9 * - Kvaser linux usbcanII driver (version 5.3)
10 *
11 * Copyright (C) 2002-2006 KVASER AB, Sweden. All rights reserved.
12 * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
13 * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
14 * Copyright (C) 2015 Valeo S.A.
15 */
16
17 #include <linux/spinlock.h>
18 #include <linux/kernel.h>
19 #include <linux/completion.h>
20 #include <linux/module.h>
21 #include <linux/netdevice.h>
22 #include <linux/usb.h>
23
24 #include <linux/can.h>
25 #include <linux/can/dev.h>
26 #include <linux/can/error.h>
27
28 #define MAX_TX_URBS 16
29 #define MAX_RX_URBS 4
30 #define START_TIMEOUT 1000 /* msecs */
31 #define STOP_TIMEOUT 1000 /* msecs */
32 #define USB_SEND_TIMEOUT 1000 /* msecs */
33 #define USB_RECV_TIMEOUT 1000 /* msecs */
34 #define RX_BUFFER_SIZE 3072
35 #define CAN_USB_CLOCK 8000000
36 #define MAX_NET_DEVICES 3
37 #define MAX_USBCAN_NET_DEVICES 2
38
39 /* Kvaser Leaf USB devices */
40 #define KVASER_VENDOR_ID 0x0bfd
41 #define USB_LEAF_DEVEL_PRODUCT_ID 10
42 #define USB_LEAF_LITE_PRODUCT_ID 11
43 #define USB_LEAF_PRO_PRODUCT_ID 12
44 #define USB_LEAF_SPRO_PRODUCT_ID 14
45 #define USB_LEAF_PRO_LS_PRODUCT_ID 15
46 #define USB_LEAF_PRO_SWC_PRODUCT_ID 16
47 #define USB_LEAF_PRO_LIN_PRODUCT_ID 17
48 #define USB_LEAF_SPRO_LS_PRODUCT_ID 18
49 #define USB_LEAF_SPRO_SWC_PRODUCT_ID 19
50 #define USB_MEMO2_DEVEL_PRODUCT_ID 22
51 #define USB_MEMO2_HSHS_PRODUCT_ID 23
52 #define USB_UPRO_HSHS_PRODUCT_ID 24
53 #define USB_LEAF_LITE_GI_PRODUCT_ID 25
54 #define USB_LEAF_PRO_OBDII_PRODUCT_ID 26
55 #define USB_MEMO2_HSLS_PRODUCT_ID 27
56 #define USB_LEAF_LITE_CH_PRODUCT_ID 28
57 #define USB_BLACKBIRD_SPRO_PRODUCT_ID 29
58 #define USB_OEM_MERCURY_PRODUCT_ID 34
59 #define USB_OEM_LEAF_PRODUCT_ID 35
60 #define USB_CAN_R_PRODUCT_ID 39
61 #define USB_LEAF_LITE_V2_PRODUCT_ID 288
62 #define USB_MINI_PCIE_HS_PRODUCT_ID 289
63
64 static inline bool kvaser_is_leaf(const struct usb_device_id *id)
65 {
66 return id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
67 id->idProduct <= USB_MINI_PCIE_HS_PRODUCT_ID;
68 }
69
70 /* Kvaser USBCan-II devices */
71 #define USB_USBCAN_REVB_PRODUCT_ID 2
72 #define USB_VCI2_PRODUCT_ID 3
73 #define USB_USBCAN2_PRODUCT_ID 4
74 #define USB_MEMORATOR_PRODUCT_ID 5
75
76 static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
77 {
78 return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
79 id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
80 }
81
82 /* USB devices features */
83 #define KVASER_HAS_SILENT_MODE BIT(0)
84 #define KVASER_HAS_TXRX_ERRORS BIT(1)
85
86 /* Message header size */
87 #define MSG_HEADER_LEN 2
88
89 /* Can message flags */
90 #define MSG_FLAG_ERROR_FRAME BIT(0)
91 #define MSG_FLAG_OVERRUN BIT(1)
92 #define MSG_FLAG_NERR BIT(2)
93 #define MSG_FLAG_WAKEUP BIT(3)
94 #define MSG_FLAG_REMOTE_FRAME BIT(4)
95 #define MSG_FLAG_RESERVED BIT(5)
96 #define MSG_FLAG_TX_ACK BIT(6)
97 #define MSG_FLAG_TX_REQUEST BIT(7)
98
99 /* Can states (M16C CxSTRH register) */
100 #define M16C_STATE_BUS_RESET BIT(0)
101 #define M16C_STATE_BUS_ERROR BIT(4)
102 #define M16C_STATE_BUS_PASSIVE BIT(5)
103 #define M16C_STATE_BUS_OFF BIT(6)
104
105 /* Can msg ids */
106 #define CMD_RX_STD_MESSAGE 12
107 #define CMD_TX_STD_MESSAGE 13
108 #define CMD_RX_EXT_MESSAGE 14
109 #define CMD_TX_EXT_MESSAGE 15
110 #define CMD_SET_BUS_PARAMS 16
111 #define CMD_GET_BUS_PARAMS 17
112 #define CMD_GET_BUS_PARAMS_REPLY 18
113 #define CMD_GET_CHIP_STATE 19
114 #define CMD_CHIP_STATE_EVENT 20
115 #define CMD_SET_CTRL_MODE 21
116 #define CMD_GET_CTRL_MODE 22
117 #define CMD_GET_CTRL_MODE_REPLY 23
118 #define CMD_RESET_CHIP 24
119 #define CMD_RESET_CARD 25
120 #define CMD_START_CHIP 26
121 #define CMD_START_CHIP_REPLY 27
122 #define CMD_STOP_CHIP 28
123 #define CMD_STOP_CHIP_REPLY 29
124
125 #define CMD_LEAF_GET_CARD_INFO2 32
126 #define CMD_USBCAN_RESET_CLOCK 32
127 #define CMD_USBCAN_CLOCK_OVERFLOW_EVENT 33
128
129 #define CMD_GET_CARD_INFO 34
130 #define CMD_GET_CARD_INFO_REPLY 35
131 #define CMD_GET_SOFTWARE_INFO 38
132 #define CMD_GET_SOFTWARE_INFO_REPLY 39
133 #define CMD_ERROR_EVENT 45
134 #define CMD_FLUSH_QUEUE 48
135 #define CMD_RESET_ERROR_COUNTER 49
136 #define CMD_TX_ACKNOWLEDGE 50
137 #define CMD_CAN_ERROR_EVENT 51
138
139 #define CMD_LEAF_USB_THROTTLE 77
140 #define CMD_LEAF_LOG_MESSAGE 106
141
142 /* error factors */
143 #define M16C_EF_ACKE BIT(0)
144 #define M16C_EF_CRCE BIT(1)
145 #define M16C_EF_FORME BIT(2)
146 #define M16C_EF_STFE BIT(3)
147 #define M16C_EF_BITE0 BIT(4)
148 #define M16C_EF_BITE1 BIT(5)
149 #define M16C_EF_RCVE BIT(6)
150 #define M16C_EF_TRE BIT(7)
151
152 /* Only Leaf-based devices can report M16C error factors,
153 * thus define our own error status flags for USBCANII
154 */
155 #define USBCAN_ERROR_STATE_NONE 0
156 #define USBCAN_ERROR_STATE_TX_ERROR BIT(0)
157 #define USBCAN_ERROR_STATE_RX_ERROR BIT(1)
158 #define USBCAN_ERROR_STATE_BUSERROR BIT(2)
159
160 /* bittiming parameters */
161 #define KVASER_USB_TSEG1_MIN 1
162 #define KVASER_USB_TSEG1_MAX 16
163 #define KVASER_USB_TSEG2_MIN 1
164 #define KVASER_USB_TSEG2_MAX 8
165 #define KVASER_USB_SJW_MAX 4
166 #define KVASER_USB_BRP_MIN 1
167 #define KVASER_USB_BRP_MAX 64
168 #define KVASER_USB_BRP_INC 1
169
170 /* ctrl modes */
171 #define KVASER_CTRL_MODE_NORMAL 1
172 #define KVASER_CTRL_MODE_SILENT 2
173 #define KVASER_CTRL_MODE_SELFRECEPTION 3
174 #define KVASER_CTRL_MODE_OFF 4
175
176 /* Extended CAN identifier flag */
177 #define KVASER_EXTENDED_FRAME BIT(31)
178
179 /* Kvaser USB CAN dongles are divided into two major families:
180 * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
181 * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
182 */
183 enum kvaser_usb_family {
184 KVASER_LEAF,
185 KVASER_USBCAN,
186 };
187
188 struct kvaser_msg_simple {
189 u8 tid;
190 u8 channel;
191 } __packed;
192
193 struct kvaser_msg_cardinfo {
194 u8 tid;
195 u8 nchannels;
196 union {
197 struct {
198 __le32 serial_number;
199 __le32 padding;
200 } __packed leaf0;
201 struct {
202 __le32 serial_number_low;
203 __le32 serial_number_high;
204 } __packed usbcan0;
205 } __packed;
206 __le32 clock_resolution;
207 __le32 mfgdate;
208 u8 ean[8];
209 u8 hw_revision;
210 union {
211 struct {
212 u8 usb_hs_mode;
213 } __packed leaf1;
214 struct {
215 u8 padding;
216 } __packed usbcan1;
217 } __packed;
218 __le16 padding;
219 } __packed;
220
221 struct kvaser_msg_cardinfo2 {
222 u8 tid;
223 u8 reserved;
224 u8 pcb_id[24];
225 __le32 oem_unlock_code;
226 } __packed;
227
228 struct leaf_msg_softinfo {
229 u8 tid;
230 u8 padding0;
231 __le32 sw_options;
232 __le32 fw_version;
233 __le16 max_outstanding_tx;
234 __le16 padding1[9];
235 } __packed;
236
237 struct usbcan_msg_softinfo {
238 u8 tid;
239 u8 fw_name[5];
240 __le16 max_outstanding_tx;
241 u8 padding[6];
242 __le32 fw_version;
243 __le16 checksum;
244 __le16 sw_options;
245 } __packed;
246
247 struct kvaser_msg_busparams {
248 u8 tid;
249 u8 channel;
250 __le32 bitrate;
251 u8 tseg1;
252 u8 tseg2;
253 u8 sjw;
254 u8 no_samp;
255 } __packed;
256
257 struct kvaser_msg_tx_can {
258 u8 channel;
259 u8 tid;
260 u8 msg[14];
261 union {
262 struct {
263 u8 padding;
264 u8 flags;
265 } __packed leaf;
266 struct {
267 u8 flags;
268 u8 padding;
269 } __packed usbcan;
270 } __packed;
271 } __packed;
272
273 struct kvaser_msg_rx_can_header {
274 u8 channel;
275 u8 flag;
276 } __packed;
277
278 struct leaf_msg_rx_can {
279 u8 channel;
280 u8 flag;
281
282 __le16 time[3];
283 u8 msg[14];
284 } __packed;
285
286 struct usbcan_msg_rx_can {
287 u8 channel;
288 u8 flag;
289
290 u8 msg[14];
291 __le16 time;
292 } __packed;
293
294 struct leaf_msg_chip_state_event {
295 u8 tid;
296 u8 channel;
297
298 __le16 time[3];
299 u8 tx_errors_count;
300 u8 rx_errors_count;
301
302 u8 status;
303 u8 padding[3];
304 } __packed;
305
306 struct usbcan_msg_chip_state_event {
307 u8 tid;
308 u8 channel;
309
310 u8 tx_errors_count;
311 u8 rx_errors_count;
312 __le16 time;
313
314 u8 status;
315 u8 padding[3];
316 } __packed;
317
318 struct kvaser_msg_tx_acknowledge_header {
319 u8 channel;
320 u8 tid;
321 } __packed;
322
323 struct leaf_msg_tx_acknowledge {
324 u8 channel;
325 u8 tid;
326
327 __le16 time[3];
328 u8 flags;
329 u8 time_offset;
330 } __packed;
331
332 struct usbcan_msg_tx_acknowledge {
333 u8 channel;
334 u8 tid;
335
336 __le16 time;
337 __le16 padding;
338 } __packed;
339
340 struct leaf_msg_error_event {
341 u8 tid;
342 u8 flags;
343 __le16 time[3];
344 u8 channel;
345 u8 padding;
346 u8 tx_errors_count;
347 u8 rx_errors_count;
348 u8 status;
349 u8 error_factor;
350 } __packed;
351
352 struct usbcan_msg_error_event {
353 u8 tid;
354 u8 padding;
355 u8 tx_errors_count_ch0;
356 u8 rx_errors_count_ch0;
357 u8 tx_errors_count_ch1;
358 u8 rx_errors_count_ch1;
359 u8 status_ch0;
360 u8 status_ch1;
361 __le16 time;
362 } __packed;
363
364 struct kvaser_msg_ctrl_mode {
365 u8 tid;
366 u8 channel;
367 u8 ctrl_mode;
368 u8 padding[3];
369 } __packed;
370
371 struct kvaser_msg_flush_queue {
372 u8 tid;
373 u8 channel;
374 u8 flags;
375 u8 padding[3];
376 } __packed;
377
378 struct leaf_msg_log_message {
379 u8 channel;
380 u8 flags;
381 __le16 time[3];
382 u8 dlc;
383 u8 time_offset;
384 __le32 id;
385 u8 data[8];
386 } __packed;
387
388 struct kvaser_msg {
389 u8 len;
390 u8 id;
391 union {
392 struct kvaser_msg_simple simple;
393 struct kvaser_msg_cardinfo cardinfo;
394 struct kvaser_msg_cardinfo2 cardinfo2;
395 struct kvaser_msg_busparams busparams;
396
397 struct kvaser_msg_rx_can_header rx_can_header;
398 struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
399
400 union {
401 struct leaf_msg_softinfo softinfo;
402 struct leaf_msg_rx_can rx_can;
403 struct leaf_msg_chip_state_event chip_state_event;
404 struct leaf_msg_tx_acknowledge tx_acknowledge;
405 struct leaf_msg_error_event error_event;
406 struct leaf_msg_log_message log_message;
407 } __packed leaf;
408
409 union {
410 struct usbcan_msg_softinfo softinfo;
411 struct usbcan_msg_rx_can rx_can;
412 struct usbcan_msg_chip_state_event chip_state_event;
413 struct usbcan_msg_tx_acknowledge tx_acknowledge;
414 struct usbcan_msg_error_event error_event;
415 } __packed usbcan;
416
417 struct kvaser_msg_tx_can tx_can;
418 struct kvaser_msg_ctrl_mode ctrl_mode;
419 struct kvaser_msg_flush_queue flush_queue;
420 } u;
421 } __packed;
422
423 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
424 * handling. Some discrepancies between the two families exist:
425 *
426 * - USBCAN firmware does not report M16C "error factors"
427 * - USBCAN controllers has difficulties reporting if the raised error
428 * event is for ch0 or ch1. They leave such arbitration to the OS
429 * driver by letting it compare error counters with previous values
430 * and decide the error event's channel. Thus for USBCAN, the channel
431 * field is only advisory.
432 */
433 struct kvaser_usb_error_summary {
434 u8 channel, status, txerr, rxerr;
435 union {
436 struct {
437 u8 error_factor;
438 } leaf;
439 struct {
440 u8 other_ch_status;
441 u8 error_state;
442 } usbcan;
443 };
444 };
445
446 struct kvaser_usb_tx_urb_context {
447 struct kvaser_usb_net_priv *priv;
448 u32 echo_index;
449 int dlc;
450 };
451
452 struct kvaser_usb {
453 struct usb_device *udev;
454 struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
455
456 struct usb_endpoint_descriptor *bulk_in, *bulk_out;
457 struct usb_anchor rx_submitted;
458
459 u32 fw_version;
460 unsigned int nchannels;
461 enum kvaser_usb_family family;
462
463 bool rxinitdone;
464 void *rxbuf[MAX_RX_URBS];
465 dma_addr_t rxbuf_dma[MAX_RX_URBS];
466 };
467
468 struct kvaser_usb_net_priv {
469 struct can_priv can;
470
471 spinlock_t tx_contexts_lock;
472 int active_tx_contexts;
473 struct kvaser_usb_tx_urb_context tx_contexts[MAX_TX_URBS];
474
475 struct usb_anchor tx_submitted;
476 struct completion start_comp, stop_comp;
477
478 struct kvaser_usb *dev;
479 struct net_device *netdev;
480 int channel;
481
482 struct can_berr_counter bec;
483 };
484
485 static const struct usb_device_id kvaser_usb_table[] = {
486 /* Leaf family IDs */
487 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
488 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
489 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
490 .driver_info = KVASER_HAS_TXRX_ERRORS |
491 KVASER_HAS_SILENT_MODE },
492 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
493 .driver_info = KVASER_HAS_TXRX_ERRORS |
494 KVASER_HAS_SILENT_MODE },
495 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
496 .driver_info = KVASER_HAS_TXRX_ERRORS |
497 KVASER_HAS_SILENT_MODE },
498 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
499 .driver_info = KVASER_HAS_TXRX_ERRORS |
500 KVASER_HAS_SILENT_MODE },
501 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
502 .driver_info = KVASER_HAS_TXRX_ERRORS |
503 KVASER_HAS_SILENT_MODE },
504 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
505 .driver_info = KVASER_HAS_TXRX_ERRORS |
506 KVASER_HAS_SILENT_MODE },
507 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
508 .driver_info = KVASER_HAS_TXRX_ERRORS |
509 KVASER_HAS_SILENT_MODE },
510 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
511 .driver_info = KVASER_HAS_TXRX_ERRORS |
512 KVASER_HAS_SILENT_MODE },
513 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
514 .driver_info = KVASER_HAS_TXRX_ERRORS |
515 KVASER_HAS_SILENT_MODE },
516 { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
517 .driver_info = KVASER_HAS_TXRX_ERRORS },
518 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
519 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
520 .driver_info = KVASER_HAS_TXRX_ERRORS |
521 KVASER_HAS_SILENT_MODE },
522 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
523 .driver_info = KVASER_HAS_TXRX_ERRORS },
524 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
525 .driver_info = KVASER_HAS_TXRX_ERRORS },
526 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
527 .driver_info = KVASER_HAS_TXRX_ERRORS },
528 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
529 .driver_info = KVASER_HAS_TXRX_ERRORS },
530 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
531 .driver_info = KVASER_HAS_TXRX_ERRORS },
532 { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
533 .driver_info = KVASER_HAS_TXRX_ERRORS },
534 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
535 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
536
537 /* USBCANII family IDs */
538 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
539 .driver_info = KVASER_HAS_TXRX_ERRORS },
540 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
541 .driver_info = KVASER_HAS_TXRX_ERRORS },
542 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
543 .driver_info = KVASER_HAS_TXRX_ERRORS },
544 { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
545 .driver_info = KVASER_HAS_TXRX_ERRORS },
546
547 { }
548 };
549 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
550
551 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
552 struct kvaser_msg *msg)
553 {
554 int actual_len;
555
556 return usb_bulk_msg(dev->udev,
557 usb_sndbulkpipe(dev->udev,
558 dev->bulk_out->bEndpointAddress),
559 msg, msg->len, &actual_len,
560 USB_SEND_TIMEOUT);
561 }
562
563 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
564 struct kvaser_msg *msg)
565 {
566 struct kvaser_msg *tmp;
567 void *buf;
568 int actual_len;
569 int err;
570 int pos;
571 unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
572
573 buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
574 if (!buf)
575 return -ENOMEM;
576
577 do {
578 err = usb_bulk_msg(dev->udev,
579 usb_rcvbulkpipe(dev->udev,
580 dev->bulk_in->bEndpointAddress),
581 buf, RX_BUFFER_SIZE, &actual_len,
582 USB_RECV_TIMEOUT);
583 if (err < 0)
584 goto end;
585
586 pos = 0;
587 while (pos <= actual_len - MSG_HEADER_LEN) {
588 tmp = buf + pos;
589
590 /* Handle messages crossing the USB endpoint max packet
591 * size boundary. Check kvaser_usb_read_bulk_callback()
592 * for further details.
593 */
594 if (tmp->len == 0) {
595 pos = round_up(pos,
596 dev->bulk_in->wMaxPacketSize);
597 continue;
598 }
599
600 if (pos + tmp->len > actual_len) {
601 dev_err(dev->udev->dev.parent,
602 "Format error\n");
603 break;
604 }
605
606 if (tmp->id == id) {
607 memcpy(msg, tmp, tmp->len);
608 goto end;
609 }
610
611 pos += tmp->len;
612 }
613 } while (time_before(jiffies, to));
614
615 err = -EINVAL;
616
617 end:
618 kfree(buf);
619
620 return err;
621 }
622
623 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
624 u8 msg_id, int channel)
625 {
626 struct kvaser_msg *msg;
627 int rc;
628
629 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
630 if (!msg)
631 return -ENOMEM;
632
633 msg->id = msg_id;
634 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
635 msg->u.simple.channel = channel;
636 msg->u.simple.tid = 0xff;
637
638 rc = kvaser_usb_send_msg(dev, msg);
639
640 kfree(msg);
641 return rc;
642 }
643
644 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
645 {
646 struct kvaser_msg msg;
647 int err;
648
649 err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
650 if (err)
651 return err;
652
653 err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
654 if (err)
655 return err;
656
657 switch (dev->family) {
658 case KVASER_LEAF:
659 dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
660 break;
661 case KVASER_USBCAN:
662 dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
663 break;
664 }
665
666 return 0;
667 }
668
669 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
670 {
671 struct kvaser_msg msg;
672 int err;
673
674 err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
675 if (err)
676 return err;
677
678 err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
679 if (err)
680 return err;
681
682 dev->nchannels = msg.u.cardinfo.nchannels;
683 if ((dev->nchannels > MAX_NET_DEVICES) ||
684 (dev->family == KVASER_USBCAN &&
685 dev->nchannels > MAX_USBCAN_NET_DEVICES))
686 return -EINVAL;
687
688 return 0;
689 }
690
691 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
692 const struct kvaser_msg *msg)
693 {
694 struct net_device_stats *stats;
695 struct kvaser_usb_tx_urb_context *context;
696 struct kvaser_usb_net_priv *priv;
697 struct sk_buff *skb;
698 struct can_frame *cf;
699 unsigned long flags;
700 u8 channel, tid;
701
702 channel = msg->u.tx_acknowledge_header.channel;
703 tid = msg->u.tx_acknowledge_header.tid;
704
705 if (channel >= dev->nchannels) {
706 dev_err(dev->udev->dev.parent,
707 "Invalid channel number (%d)\n", channel);
708 return;
709 }
710
711 priv = dev->nets[channel];
712
713 if (!netif_device_present(priv->netdev))
714 return;
715
716 stats = &priv->netdev->stats;
717
718 context = &priv->tx_contexts[tid % MAX_TX_URBS];
719
720 /* Sometimes the state change doesn't come after a bus-off event */
721 if (priv->can.restart_ms &&
722 (priv->can.state >= CAN_STATE_BUS_OFF)) {
723 skb = alloc_can_err_skb(priv->netdev, &cf);
724 if (skb) {
725 cf->can_id |= CAN_ERR_RESTARTED;
726
727 stats->rx_packets++;
728 stats->rx_bytes += cf->can_dlc;
729 netif_rx(skb);
730 } else {
731 netdev_err(priv->netdev,
732 "No memory left for err_skb\n");
733 }
734
735 priv->can.can_stats.restarts++;
736 netif_carrier_on(priv->netdev);
737
738 priv->can.state = CAN_STATE_ERROR_ACTIVE;
739 }
740
741 stats->tx_packets++;
742 stats->tx_bytes += context->dlc;
743
744 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
745
746 can_get_echo_skb(priv->netdev, context->echo_index);
747 context->echo_index = MAX_TX_URBS;
748 --priv->active_tx_contexts;
749 netif_wake_queue(priv->netdev);
750
751 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
752 }
753
754 static void kvaser_usb_simple_msg_callback(struct urb *urb)
755 {
756 struct net_device *netdev = urb->context;
757
758 kfree(urb->transfer_buffer);
759
760 if (urb->status)
761 netdev_warn(netdev, "urb status received: %d\n",
762 urb->status);
763 }
764
765 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
766 u8 msg_id)
767 {
768 struct kvaser_usb *dev = priv->dev;
769 struct net_device *netdev = priv->netdev;
770 struct kvaser_msg *msg;
771 struct urb *urb;
772 void *buf;
773 int err;
774
775 urb = usb_alloc_urb(0, GFP_ATOMIC);
776 if (!urb) {
777 netdev_err(netdev, "No memory left for URBs\n");
778 return -ENOMEM;
779 }
780
781 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
782 if (!buf) {
783 usb_free_urb(urb);
784 return -ENOMEM;
785 }
786
787 msg = (struct kvaser_msg *)buf;
788 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
789 msg->id = msg_id;
790 msg->u.simple.channel = priv->channel;
791
792 usb_fill_bulk_urb(urb, dev->udev,
793 usb_sndbulkpipe(dev->udev,
794 dev->bulk_out->bEndpointAddress),
795 buf, msg->len,
796 kvaser_usb_simple_msg_callback, netdev);
797 usb_anchor_urb(urb, &priv->tx_submitted);
798
799 err = usb_submit_urb(urb, GFP_ATOMIC);
800 if (err) {
801 netdev_err(netdev, "Error transmitting URB\n");
802 usb_unanchor_urb(urb);
803 usb_free_urb(urb);
804 return err;
805 }
806
807 usb_free_urb(urb);
808
809 return 0;
810 }
811
812 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
813 const struct kvaser_usb_error_summary *es,
814 struct can_frame *cf)
815 {
816 struct kvaser_usb *dev = priv->dev;
817 struct net_device_stats *stats = &priv->netdev->stats;
818 enum can_state cur_state, new_state, tx_state, rx_state;
819
820 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
821
822 new_state = cur_state = priv->can.state;
823
824 if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
825 new_state = CAN_STATE_BUS_OFF;
826 else if (es->status & M16C_STATE_BUS_PASSIVE)
827 new_state = CAN_STATE_ERROR_PASSIVE;
828 else if (es->status & M16C_STATE_BUS_ERROR) {
829 /* Guard against spurious error events after a busoff */
830 if (cur_state < CAN_STATE_BUS_OFF) {
831 if ((es->txerr >= 128) || (es->rxerr >= 128))
832 new_state = CAN_STATE_ERROR_PASSIVE;
833 else if ((es->txerr >= 96) || (es->rxerr >= 96))
834 new_state = CAN_STATE_ERROR_WARNING;
835 else if (cur_state > CAN_STATE_ERROR_ACTIVE)
836 new_state = CAN_STATE_ERROR_ACTIVE;
837 }
838 }
839
840 if (!es->status)
841 new_state = CAN_STATE_ERROR_ACTIVE;
842
843 if (new_state != cur_state) {
844 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
845 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
846
847 can_change_state(priv->netdev, cf, tx_state, rx_state);
848 }
849
850 if (priv->can.restart_ms &&
851 (cur_state >= CAN_STATE_BUS_OFF) &&
852 (new_state < CAN_STATE_BUS_OFF)) {
853 priv->can.can_stats.restarts++;
854 }
855
856 switch (dev->family) {
857 case KVASER_LEAF:
858 if (es->leaf.error_factor) {
859 priv->can.can_stats.bus_error++;
860 stats->rx_errors++;
861 }
862 break;
863 case KVASER_USBCAN:
864 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
865 stats->tx_errors++;
866 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
867 stats->rx_errors++;
868 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
869 priv->can.can_stats.bus_error++;
870 }
871 break;
872 }
873
874 priv->bec.txerr = es->txerr;
875 priv->bec.rxerr = es->rxerr;
876 }
877
878 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
879 const struct kvaser_usb_error_summary *es)
880 {
881 struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
882 struct sk_buff *skb;
883 struct net_device_stats *stats;
884 struct kvaser_usb_net_priv *priv;
885 enum can_state old_state, new_state;
886
887 if (es->channel >= dev->nchannels) {
888 dev_err(dev->udev->dev.parent,
889 "Invalid channel number (%d)\n", es->channel);
890 return;
891 }
892
893 priv = dev->nets[es->channel];
894 stats = &priv->netdev->stats;
895
896 /* Update all of the can interface's state and error counters before
897 * trying any memory allocation that can actually fail with -ENOMEM.
898 *
899 * We send a temporary stack-allocated error can frame to
900 * can_change_state() for the very same reason.
901 *
902 * TODO: Split can_change_state() responsibility between updating the
903 * can interface's state and counters, and the setting up of can error
904 * frame ID and data to userspace. Remove stack allocation afterwards.
905 */
906 old_state = priv->can.state;
907 kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
908 new_state = priv->can.state;
909
910 skb = alloc_can_err_skb(priv->netdev, &cf);
911 if (!skb) {
912 stats->rx_dropped++;
913 return;
914 }
915 memcpy(cf, &tmp_cf, sizeof(*cf));
916
917 if (new_state != old_state) {
918 if (es->status &
919 (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
920 if (!priv->can.restart_ms)
921 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
922 netif_carrier_off(priv->netdev);
923 }
924
925 if (priv->can.restart_ms &&
926 (old_state >= CAN_STATE_BUS_OFF) &&
927 (new_state < CAN_STATE_BUS_OFF)) {
928 cf->can_id |= CAN_ERR_RESTARTED;
929 netif_carrier_on(priv->netdev);
930 }
931 }
932
933 switch (dev->family) {
934 case KVASER_LEAF:
935 if (es->leaf.error_factor) {
936 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
937
938 if (es->leaf.error_factor & M16C_EF_ACKE)
939 cf->data[3] |= (CAN_ERR_PROT_LOC_ACK);
940 if (es->leaf.error_factor & M16C_EF_CRCE)
941 cf->data[3] |= (CAN_ERR_PROT_LOC_CRC_SEQ |
942 CAN_ERR_PROT_LOC_CRC_DEL);
943 if (es->leaf.error_factor & M16C_EF_FORME)
944 cf->data[2] |= CAN_ERR_PROT_FORM;
945 if (es->leaf.error_factor & M16C_EF_STFE)
946 cf->data[2] |= CAN_ERR_PROT_STUFF;
947 if (es->leaf.error_factor & M16C_EF_BITE0)
948 cf->data[2] |= CAN_ERR_PROT_BIT0;
949 if (es->leaf.error_factor & M16C_EF_BITE1)
950 cf->data[2] |= CAN_ERR_PROT_BIT1;
951 if (es->leaf.error_factor & M16C_EF_TRE)
952 cf->data[2] |= CAN_ERR_PROT_TX;
953 }
954 break;
955 case KVASER_USBCAN:
956 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
957 cf->can_id |= CAN_ERR_BUSERROR;
958 }
959 break;
960 }
961
962 cf->data[6] = es->txerr;
963 cf->data[7] = es->rxerr;
964
965 stats->rx_packets++;
966 stats->rx_bytes += cf->can_dlc;
967 netif_rx(skb);
968 }
969
970 /* For USBCAN, report error to userspace iff the channels's errors counter
971 * has changed, or we're the only channel seeing a bus error state.
972 */
973 static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
974 struct kvaser_usb_error_summary *es)
975 {
976 struct kvaser_usb_net_priv *priv;
977 int channel;
978 bool report_error;
979
980 channel = es->channel;
981 if (channel >= dev->nchannels) {
982 dev_err(dev->udev->dev.parent,
983 "Invalid channel number (%d)\n", channel);
984 return;
985 }
986
987 priv = dev->nets[channel];
988 report_error = false;
989
990 if (es->txerr != priv->bec.txerr) {
991 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
992 report_error = true;
993 }
994 if (es->rxerr != priv->bec.rxerr) {
995 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
996 report_error = true;
997 }
998 if ((es->status & M16C_STATE_BUS_ERROR) &&
999 !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
1000 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
1001 report_error = true;
1002 }
1003
1004 if (report_error)
1005 kvaser_usb_rx_error(dev, es);
1006 }
1007
1008 static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
1009 const struct kvaser_msg *msg)
1010 {
1011 struct kvaser_usb_error_summary es = { };
1012
1013 switch (msg->id) {
1014 /* Sometimes errors are sent as unsolicited chip state events */
1015 case CMD_CHIP_STATE_EVENT:
1016 es.channel = msg->u.usbcan.chip_state_event.channel;
1017 es.status = msg->u.usbcan.chip_state_event.status;
1018 es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
1019 es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
1020 kvaser_usbcan_conditionally_rx_error(dev, &es);
1021 break;
1022
1023 case CMD_CAN_ERROR_EVENT:
1024 es.channel = 0;
1025 es.status = msg->u.usbcan.error_event.status_ch0;
1026 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
1027 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
1028 es.usbcan.other_ch_status =
1029 msg->u.usbcan.error_event.status_ch1;
1030 kvaser_usbcan_conditionally_rx_error(dev, &es);
1031
1032 /* The USBCAN firmware supports up to 2 channels.
1033 * Now that ch0 was checked, check if ch1 has any errors.
1034 */
1035 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1036 es.channel = 1;
1037 es.status = msg->u.usbcan.error_event.status_ch1;
1038 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
1039 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
1040 es.usbcan.other_ch_status =
1041 msg->u.usbcan.error_event.status_ch0;
1042 kvaser_usbcan_conditionally_rx_error(dev, &es);
1043 }
1044 break;
1045
1046 default:
1047 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1048 msg->id);
1049 }
1050 }
1051
1052 static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
1053 const struct kvaser_msg *msg)
1054 {
1055 struct kvaser_usb_error_summary es = { };
1056
1057 switch (msg->id) {
1058 case CMD_CAN_ERROR_EVENT:
1059 es.channel = msg->u.leaf.error_event.channel;
1060 es.status = msg->u.leaf.error_event.status;
1061 es.txerr = msg->u.leaf.error_event.tx_errors_count;
1062 es.rxerr = msg->u.leaf.error_event.rx_errors_count;
1063 es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
1064 break;
1065 case CMD_LEAF_LOG_MESSAGE:
1066 es.channel = msg->u.leaf.log_message.channel;
1067 es.status = msg->u.leaf.log_message.data[0];
1068 es.txerr = msg->u.leaf.log_message.data[2];
1069 es.rxerr = msg->u.leaf.log_message.data[3];
1070 es.leaf.error_factor = msg->u.leaf.log_message.data[1];
1071 break;
1072 case CMD_CHIP_STATE_EVENT:
1073 es.channel = msg->u.leaf.chip_state_event.channel;
1074 es.status = msg->u.leaf.chip_state_event.status;
1075 es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
1076 es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
1077 es.leaf.error_factor = 0;
1078 break;
1079 default:
1080 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1081 msg->id);
1082 return;
1083 }
1084
1085 kvaser_usb_rx_error(dev, &es);
1086 }
1087
1088 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
1089 const struct kvaser_msg *msg)
1090 {
1091 struct can_frame *cf;
1092 struct sk_buff *skb;
1093 struct net_device_stats *stats = &priv->netdev->stats;
1094
1095 if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1096 MSG_FLAG_NERR)) {
1097 netdev_err(priv->netdev, "Unknow error (flags: 0x%02x)\n",
1098 msg->u.rx_can_header.flag);
1099
1100 stats->rx_errors++;
1101 return;
1102 }
1103
1104 if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
1105 stats->rx_over_errors++;
1106 stats->rx_errors++;
1107
1108 skb = alloc_can_err_skb(priv->netdev, &cf);
1109 if (!skb) {
1110 stats->rx_dropped++;
1111 return;
1112 }
1113
1114 cf->can_id |= CAN_ERR_CRTL;
1115 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
1116
1117 stats->rx_packets++;
1118 stats->rx_bytes += cf->can_dlc;
1119 netif_rx(skb);
1120 }
1121 }
1122
1123 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
1124 const struct kvaser_msg *msg)
1125 {
1126 struct kvaser_usb_net_priv *priv;
1127 struct can_frame *cf;
1128 struct sk_buff *skb;
1129 struct net_device_stats *stats;
1130 u8 channel = msg->u.rx_can_header.channel;
1131 const u8 *rx_msg = NULL; /* GCC */
1132
1133 if (channel >= dev->nchannels) {
1134 dev_err(dev->udev->dev.parent,
1135 "Invalid channel number (%d)\n", channel);
1136 return;
1137 }
1138
1139 priv = dev->nets[channel];
1140 stats = &priv->netdev->stats;
1141
1142 if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1143 (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
1144 kvaser_leaf_rx_error(dev, msg);
1145 return;
1146 } else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1147 MSG_FLAG_NERR |
1148 MSG_FLAG_OVERRUN)) {
1149 kvaser_usb_rx_can_err(priv, msg);
1150 return;
1151 } else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1152 netdev_warn(priv->netdev,
1153 "Unhandled frame (flags: 0x%02x)",
1154 msg->u.rx_can_header.flag);
1155 return;
1156 }
1157
1158 switch (dev->family) {
1159 case KVASER_LEAF:
1160 rx_msg = msg->u.leaf.rx_can.msg;
1161 break;
1162 case KVASER_USBCAN:
1163 rx_msg = msg->u.usbcan.rx_can.msg;
1164 break;
1165 }
1166
1167 skb = alloc_can_skb(priv->netdev, &cf);
1168 if (!skb) {
1169 stats->tx_dropped++;
1170 return;
1171 }
1172
1173 if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
1174 cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
1175 if (cf->can_id & KVASER_EXTENDED_FRAME)
1176 cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1177 else
1178 cf->can_id &= CAN_SFF_MASK;
1179
1180 cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
1181
1182 if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1183 cf->can_id |= CAN_RTR_FLAG;
1184 else
1185 memcpy(cf->data, &msg->u.leaf.log_message.data,
1186 cf->can_dlc);
1187 } else {
1188 cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
1189
1190 if (msg->id == CMD_RX_EXT_MESSAGE) {
1191 cf->can_id <<= 18;
1192 cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
1193 ((rx_msg[3] & 0xff) << 6) |
1194 (rx_msg[4] & 0x3f);
1195 cf->can_id |= CAN_EFF_FLAG;
1196 }
1197
1198 cf->can_dlc = get_can_dlc(rx_msg[5]);
1199
1200 if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1201 cf->can_id |= CAN_RTR_FLAG;
1202 else
1203 memcpy(cf->data, &rx_msg[6],
1204 cf->can_dlc);
1205 }
1206
1207 stats->rx_packets++;
1208 stats->rx_bytes += cf->can_dlc;
1209 netif_rx(skb);
1210 }
1211
1212 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
1213 const struct kvaser_msg *msg)
1214 {
1215 struct kvaser_usb_net_priv *priv;
1216 u8 channel = msg->u.simple.channel;
1217
1218 if (channel >= dev->nchannels) {
1219 dev_err(dev->udev->dev.parent,
1220 "Invalid channel number (%d)\n", channel);
1221 return;
1222 }
1223
1224 priv = dev->nets[channel];
1225
1226 if (completion_done(&priv->start_comp) &&
1227 netif_queue_stopped(priv->netdev)) {
1228 netif_wake_queue(priv->netdev);
1229 } else {
1230 netif_start_queue(priv->netdev);
1231 complete(&priv->start_comp);
1232 }
1233 }
1234
1235 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
1236 const struct kvaser_msg *msg)
1237 {
1238 struct kvaser_usb_net_priv *priv;
1239 u8 channel = msg->u.simple.channel;
1240
1241 if (channel >= dev->nchannels) {
1242 dev_err(dev->udev->dev.parent,
1243 "Invalid channel number (%d)\n", channel);
1244 return;
1245 }
1246
1247 priv = dev->nets[channel];
1248
1249 complete(&priv->stop_comp);
1250 }
1251
1252 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
1253 const struct kvaser_msg *msg)
1254 {
1255 switch (msg->id) {
1256 case CMD_START_CHIP_REPLY:
1257 kvaser_usb_start_chip_reply(dev, msg);
1258 break;
1259
1260 case CMD_STOP_CHIP_REPLY:
1261 kvaser_usb_stop_chip_reply(dev, msg);
1262 break;
1263
1264 case CMD_RX_STD_MESSAGE:
1265 case CMD_RX_EXT_MESSAGE:
1266 kvaser_usb_rx_can_msg(dev, msg);
1267 break;
1268
1269 case CMD_LEAF_LOG_MESSAGE:
1270 if (dev->family != KVASER_LEAF)
1271 goto warn;
1272 kvaser_usb_rx_can_msg(dev, msg);
1273 break;
1274
1275 case CMD_CHIP_STATE_EVENT:
1276 case CMD_CAN_ERROR_EVENT:
1277 if (dev->family == KVASER_LEAF)
1278 kvaser_leaf_rx_error(dev, msg);
1279 else
1280 kvaser_usbcan_rx_error(dev, msg);
1281 break;
1282
1283 case CMD_TX_ACKNOWLEDGE:
1284 kvaser_usb_tx_acknowledge(dev, msg);
1285 break;
1286
1287 /* Ignored messages */
1288 case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1289 if (dev->family != KVASER_USBCAN)
1290 goto warn;
1291 break;
1292
1293 default:
1294 warn: dev_warn(dev->udev->dev.parent,
1295 "Unhandled message (%d)\n", msg->id);
1296 break;
1297 }
1298 }
1299
1300 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1301 {
1302 struct kvaser_usb *dev = urb->context;
1303 struct kvaser_msg *msg;
1304 int pos = 0;
1305 int err, i;
1306
1307 switch (urb->status) {
1308 case 0:
1309 break;
1310 case -ENOENT:
1311 case -ESHUTDOWN:
1312 return;
1313 default:
1314 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1315 urb->status);
1316 goto resubmit_urb;
1317 }
1318
1319 while (pos <= urb->actual_length - MSG_HEADER_LEN) {
1320 msg = urb->transfer_buffer + pos;
1321
1322 /* The Kvaser firmware can only read and write messages that
1323 * does not cross the USB's endpoint wMaxPacketSize boundary.
1324 * If a follow-up command crosses such boundary, firmware puts
1325 * a placeholder zero-length command in its place then aligns
1326 * the real command to the next max packet size.
1327 *
1328 * Handle such cases or we're going to miss a significant
1329 * number of events in case of a heavy rx load on the bus.
1330 */
1331 if (msg->len == 0) {
1332 pos = round_up(pos, dev->bulk_in->wMaxPacketSize);
1333 continue;
1334 }
1335
1336 if (pos + msg->len > urb->actual_length) {
1337 dev_err(dev->udev->dev.parent, "Format error\n");
1338 break;
1339 }
1340
1341 kvaser_usb_handle_message(dev, msg);
1342 pos += msg->len;
1343 }
1344
1345 resubmit_urb:
1346 usb_fill_bulk_urb(urb, dev->udev,
1347 usb_rcvbulkpipe(dev->udev,
1348 dev->bulk_in->bEndpointAddress),
1349 urb->transfer_buffer, RX_BUFFER_SIZE,
1350 kvaser_usb_read_bulk_callback, dev);
1351
1352 err = usb_submit_urb(urb, GFP_ATOMIC);
1353 if (err == -ENODEV) {
1354 for (i = 0; i < dev->nchannels; i++) {
1355 if (!dev->nets[i])
1356 continue;
1357
1358 netif_device_detach(dev->nets[i]->netdev);
1359 }
1360 } else if (err) {
1361 dev_err(dev->udev->dev.parent,
1362 "Failed resubmitting read bulk urb: %d\n", err);
1363 }
1364
1365 return;
1366 }
1367
1368 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1369 {
1370 int i, err = 0;
1371
1372 if (dev->rxinitdone)
1373 return 0;
1374
1375 for (i = 0; i < MAX_RX_URBS; i++) {
1376 struct urb *urb = NULL;
1377 u8 *buf = NULL;
1378 dma_addr_t buf_dma;
1379
1380 urb = usb_alloc_urb(0, GFP_KERNEL);
1381 if (!urb) {
1382 dev_warn(dev->udev->dev.parent,
1383 "No memory left for URBs\n");
1384 err = -ENOMEM;
1385 break;
1386 }
1387
1388 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1389 GFP_KERNEL, &buf_dma);
1390 if (!buf) {
1391 dev_warn(dev->udev->dev.parent,
1392 "No memory left for USB buffer\n");
1393 usb_free_urb(urb);
1394 err = -ENOMEM;
1395 break;
1396 }
1397
1398 usb_fill_bulk_urb(urb, dev->udev,
1399 usb_rcvbulkpipe(dev->udev,
1400 dev->bulk_in->bEndpointAddress),
1401 buf, RX_BUFFER_SIZE,
1402 kvaser_usb_read_bulk_callback,
1403 dev);
1404 urb->transfer_dma = buf_dma;
1405 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1406 usb_anchor_urb(urb, &dev->rx_submitted);
1407
1408 err = usb_submit_urb(urb, GFP_KERNEL);
1409 if (err) {
1410 usb_unanchor_urb(urb);
1411 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1412 buf_dma);
1413 usb_free_urb(urb);
1414 break;
1415 }
1416
1417 dev->rxbuf[i] = buf;
1418 dev->rxbuf_dma[i] = buf_dma;
1419
1420 usb_free_urb(urb);
1421 }
1422
1423 if (i == 0) {
1424 dev_warn(dev->udev->dev.parent,
1425 "Cannot setup read URBs, error %d\n", err);
1426 return err;
1427 } else if (i < MAX_RX_URBS) {
1428 dev_warn(dev->udev->dev.parent,
1429 "RX performances may be slow\n");
1430 }
1431
1432 dev->rxinitdone = true;
1433
1434 return 0;
1435 }
1436
1437 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1438 {
1439 struct kvaser_msg *msg;
1440 int rc;
1441
1442 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1443 if (!msg)
1444 return -ENOMEM;
1445
1446 msg->id = CMD_SET_CTRL_MODE;
1447 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1448 msg->u.ctrl_mode.tid = 0xff;
1449 msg->u.ctrl_mode.channel = priv->channel;
1450
1451 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1452 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1453 else
1454 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1455
1456 rc = kvaser_usb_send_msg(priv->dev, msg);
1457
1458 kfree(msg);
1459 return rc;
1460 }
1461
1462 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1463 {
1464 int err;
1465
1466 init_completion(&priv->start_comp);
1467
1468 err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1469 priv->channel);
1470 if (err)
1471 return err;
1472
1473 if (!wait_for_completion_timeout(&priv->start_comp,
1474 msecs_to_jiffies(START_TIMEOUT)))
1475 return -ETIMEDOUT;
1476
1477 return 0;
1478 }
1479
1480 static int kvaser_usb_open(struct net_device *netdev)
1481 {
1482 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1483 struct kvaser_usb *dev = priv->dev;
1484 int err;
1485
1486 err = open_candev(netdev);
1487 if (err)
1488 return err;
1489
1490 err = kvaser_usb_setup_rx_urbs(dev);
1491 if (err)
1492 goto error;
1493
1494 err = kvaser_usb_set_opt_mode(priv);
1495 if (err)
1496 goto error;
1497
1498 err = kvaser_usb_start_chip(priv);
1499 if (err) {
1500 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1501 goto error;
1502 }
1503
1504 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1505
1506 return 0;
1507
1508 error:
1509 close_candev(netdev);
1510 return err;
1511 }
1512
1513 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1514 {
1515 int i;
1516
1517 priv->active_tx_contexts = 0;
1518 for (i = 0; i < MAX_TX_URBS; i++)
1519 priv->tx_contexts[i].echo_index = MAX_TX_URBS;
1520 }
1521
1522 /* This method might sleep. Do not call it in the atomic context
1523 * of URB completions.
1524 */
1525 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1526 {
1527 usb_kill_anchored_urbs(&priv->tx_submitted);
1528 kvaser_usb_reset_tx_urb_contexts(priv);
1529 }
1530
1531 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1532 {
1533 int i;
1534
1535 usb_kill_anchored_urbs(&dev->rx_submitted);
1536
1537 for (i = 0; i < MAX_RX_URBS; i++)
1538 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1539 dev->rxbuf[i],
1540 dev->rxbuf_dma[i]);
1541
1542 for (i = 0; i < dev->nchannels; i++) {
1543 struct kvaser_usb_net_priv *priv = dev->nets[i];
1544
1545 if (priv)
1546 kvaser_usb_unlink_tx_urbs(priv);
1547 }
1548 }
1549
1550 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1551 {
1552 int err;
1553
1554 init_completion(&priv->stop_comp);
1555
1556 err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1557 priv->channel);
1558 if (err)
1559 return err;
1560
1561 if (!wait_for_completion_timeout(&priv->stop_comp,
1562 msecs_to_jiffies(STOP_TIMEOUT)))
1563 return -ETIMEDOUT;
1564
1565 return 0;
1566 }
1567
1568 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1569 {
1570 struct kvaser_msg *msg;
1571 int rc;
1572
1573 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1574 if (!msg)
1575 return -ENOMEM;
1576
1577 msg->id = CMD_FLUSH_QUEUE;
1578 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1579 msg->u.flush_queue.channel = priv->channel;
1580 msg->u.flush_queue.flags = 0x00;
1581
1582 rc = kvaser_usb_send_msg(priv->dev, msg);
1583
1584 kfree(msg);
1585 return rc;
1586 }
1587
1588 static int kvaser_usb_close(struct net_device *netdev)
1589 {
1590 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1591 struct kvaser_usb *dev = priv->dev;
1592 int err;
1593
1594 netif_stop_queue(netdev);
1595
1596 err = kvaser_usb_flush_queue(priv);
1597 if (err)
1598 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1599
1600 if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1601 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1602
1603 err = kvaser_usb_stop_chip(priv);
1604 if (err)
1605 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1606
1607 /* reset tx contexts */
1608 kvaser_usb_unlink_tx_urbs(priv);
1609
1610 priv->can.state = CAN_STATE_STOPPED;
1611 close_candev(priv->netdev);
1612
1613 return 0;
1614 }
1615
1616 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1617 {
1618 struct kvaser_usb_tx_urb_context *context = urb->context;
1619 struct kvaser_usb_net_priv *priv;
1620 struct net_device *netdev;
1621
1622 if (WARN_ON(!context))
1623 return;
1624
1625 priv = context->priv;
1626 netdev = priv->netdev;
1627
1628 kfree(urb->transfer_buffer);
1629
1630 if (!netif_device_present(netdev))
1631 return;
1632
1633 if (urb->status)
1634 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1635 }
1636
1637 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1638 struct net_device *netdev)
1639 {
1640 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1641 struct kvaser_usb *dev = priv->dev;
1642 struct net_device_stats *stats = &netdev->stats;
1643 struct can_frame *cf = (struct can_frame *)skb->data;
1644 struct kvaser_usb_tx_urb_context *context = NULL;
1645 struct urb *urb;
1646 void *buf;
1647 struct kvaser_msg *msg;
1648 int i, err, ret = NETDEV_TX_OK;
1649 u8 *msg_tx_can_flags = NULL; /* GCC */
1650 unsigned long flags;
1651
1652 if (can_dropped_invalid_skb(netdev, skb))
1653 return NETDEV_TX_OK;
1654
1655 urb = usb_alloc_urb(0, GFP_ATOMIC);
1656 if (!urb) {
1657 netdev_err(netdev, "No memory left for URBs\n");
1658 stats->tx_dropped++;
1659 dev_kfree_skb(skb);
1660 return NETDEV_TX_OK;
1661 }
1662
1663 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1664 if (!buf) {
1665 stats->tx_dropped++;
1666 dev_kfree_skb(skb);
1667 goto freeurb;
1668 }
1669
1670 msg = buf;
1671 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1672 msg->u.tx_can.channel = priv->channel;
1673
1674 switch (dev->family) {
1675 case KVASER_LEAF:
1676 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1677 break;
1678 case KVASER_USBCAN:
1679 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1680 break;
1681 }
1682
1683 *msg_tx_can_flags = 0;
1684
1685 if (cf->can_id & CAN_EFF_FLAG) {
1686 msg->id = CMD_TX_EXT_MESSAGE;
1687 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1688 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1689 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1690 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1691 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1692 } else {
1693 msg->id = CMD_TX_STD_MESSAGE;
1694 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1695 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1696 }
1697
1698 msg->u.tx_can.msg[5] = cf->can_dlc;
1699 memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1700
1701 if (cf->can_id & CAN_RTR_FLAG)
1702 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1703
1704 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1705 for (i = 0; i < ARRAY_SIZE(priv->tx_contexts); i++) {
1706 if (priv->tx_contexts[i].echo_index == MAX_TX_URBS) {
1707 context = &priv->tx_contexts[i];
1708
1709 context->echo_index = i;
1710 can_put_echo_skb(skb, netdev, context->echo_index);
1711 ++priv->active_tx_contexts;
1712 if (priv->active_tx_contexts >= MAX_TX_URBS)
1713 netif_stop_queue(netdev);
1714
1715 break;
1716 }
1717 }
1718 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1719
1720 /* This should never happen; it implies a flow control bug */
1721 if (!context) {
1722 netdev_warn(netdev, "cannot find free context\n");
1723
1724 kfree(buf);
1725 ret = NETDEV_TX_BUSY;
1726 goto freeurb;
1727 }
1728
1729 context->priv = priv;
1730 context->dlc = cf->can_dlc;
1731
1732 msg->u.tx_can.tid = context->echo_index;
1733
1734 usb_fill_bulk_urb(urb, dev->udev,
1735 usb_sndbulkpipe(dev->udev,
1736 dev->bulk_out->bEndpointAddress),
1737 buf, msg->len,
1738 kvaser_usb_write_bulk_callback, context);
1739 usb_anchor_urb(urb, &priv->tx_submitted);
1740
1741 err = usb_submit_urb(urb, GFP_ATOMIC);
1742 if (unlikely(err)) {
1743 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1744
1745 can_free_echo_skb(netdev, context->echo_index);
1746 context->echo_index = MAX_TX_URBS;
1747 --priv->active_tx_contexts;
1748 netif_wake_queue(netdev);
1749
1750 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1751
1752 usb_unanchor_urb(urb);
1753
1754 stats->tx_dropped++;
1755
1756 if (err == -ENODEV)
1757 netif_device_detach(netdev);
1758 else
1759 netdev_warn(netdev, "Failed tx_urb %d\n", err);
1760
1761 goto freeurb;
1762 }
1763
1764 ret = NETDEV_TX_OK;
1765
1766 freeurb:
1767 usb_free_urb(urb);
1768 return ret;
1769 }
1770
1771 static const struct net_device_ops kvaser_usb_netdev_ops = {
1772 .ndo_open = kvaser_usb_open,
1773 .ndo_stop = kvaser_usb_close,
1774 .ndo_start_xmit = kvaser_usb_start_xmit,
1775 .ndo_change_mtu = can_change_mtu,
1776 };
1777
1778 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1779 .name = "kvaser_usb",
1780 .tseg1_min = KVASER_USB_TSEG1_MIN,
1781 .tseg1_max = KVASER_USB_TSEG1_MAX,
1782 .tseg2_min = KVASER_USB_TSEG2_MIN,
1783 .tseg2_max = KVASER_USB_TSEG2_MAX,
1784 .sjw_max = KVASER_USB_SJW_MAX,
1785 .brp_min = KVASER_USB_BRP_MIN,
1786 .brp_max = KVASER_USB_BRP_MAX,
1787 .brp_inc = KVASER_USB_BRP_INC,
1788 };
1789
1790 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1791 {
1792 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1793 struct can_bittiming *bt = &priv->can.bittiming;
1794 struct kvaser_usb *dev = priv->dev;
1795 struct kvaser_msg *msg;
1796 int rc;
1797
1798 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1799 if (!msg)
1800 return -ENOMEM;
1801
1802 msg->id = CMD_SET_BUS_PARAMS;
1803 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1804 msg->u.busparams.channel = priv->channel;
1805 msg->u.busparams.tid = 0xff;
1806 msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1807 msg->u.busparams.sjw = bt->sjw;
1808 msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1809 msg->u.busparams.tseg2 = bt->phase_seg2;
1810
1811 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1812 msg->u.busparams.no_samp = 3;
1813 else
1814 msg->u.busparams.no_samp = 1;
1815
1816 rc = kvaser_usb_send_msg(dev, msg);
1817
1818 kfree(msg);
1819 return rc;
1820 }
1821
1822 static int kvaser_usb_set_mode(struct net_device *netdev,
1823 enum can_mode mode)
1824 {
1825 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1826 int err;
1827
1828 switch (mode) {
1829 case CAN_MODE_START:
1830 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1831 if (err)
1832 return err;
1833 break;
1834 default:
1835 return -EOPNOTSUPP;
1836 }
1837
1838 return 0;
1839 }
1840
1841 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1842 struct can_berr_counter *bec)
1843 {
1844 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1845
1846 *bec = priv->bec;
1847
1848 return 0;
1849 }
1850
1851 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1852 {
1853 int i;
1854
1855 for (i = 0; i < dev->nchannels; i++) {
1856 if (!dev->nets[i])
1857 continue;
1858
1859 unregister_netdev(dev->nets[i]->netdev);
1860 }
1861
1862 kvaser_usb_unlink_all_urbs(dev);
1863
1864 for (i = 0; i < dev->nchannels; i++) {
1865 if (!dev->nets[i])
1866 continue;
1867
1868 free_candev(dev->nets[i]->netdev);
1869 }
1870 }
1871
1872 static int kvaser_usb_init_one(struct usb_interface *intf,
1873 const struct usb_device_id *id, int channel)
1874 {
1875 struct kvaser_usb *dev = usb_get_intfdata(intf);
1876 struct net_device *netdev;
1877 struct kvaser_usb_net_priv *priv;
1878 int err;
1879
1880 err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1881 if (err)
1882 return err;
1883
1884 netdev = alloc_candev(sizeof(*priv), MAX_TX_URBS);
1885 if (!netdev) {
1886 dev_err(&intf->dev, "Cannot alloc candev\n");
1887 return -ENOMEM;
1888 }
1889
1890 priv = netdev_priv(netdev);
1891
1892 init_usb_anchor(&priv->tx_submitted);
1893 init_completion(&priv->start_comp);
1894 init_completion(&priv->stop_comp);
1895
1896 priv->dev = dev;
1897 priv->netdev = netdev;
1898 priv->channel = channel;
1899
1900 spin_lock_init(&priv->tx_contexts_lock);
1901 kvaser_usb_reset_tx_urb_contexts(priv);
1902
1903 priv->can.state = CAN_STATE_STOPPED;
1904 priv->can.clock.freq = CAN_USB_CLOCK;
1905 priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1906 priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1907 priv->can.do_set_mode = kvaser_usb_set_mode;
1908 if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1909 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1910 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1911 if (id->driver_info & KVASER_HAS_SILENT_MODE)
1912 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1913
1914 netdev->flags |= IFF_ECHO;
1915
1916 netdev->netdev_ops = &kvaser_usb_netdev_ops;
1917
1918 SET_NETDEV_DEV(netdev, &intf->dev);
1919 netdev->dev_id = channel;
1920
1921 dev->nets[channel] = priv;
1922
1923 err = register_candev(netdev);
1924 if (err) {
1925 dev_err(&intf->dev, "Failed to register can device\n");
1926 free_candev(netdev);
1927 dev->nets[channel] = NULL;
1928 return err;
1929 }
1930
1931 netdev_dbg(netdev, "device registered\n");
1932
1933 return 0;
1934 }
1935
1936 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1937 struct usb_endpoint_descriptor **in,
1938 struct usb_endpoint_descriptor **out)
1939 {
1940 const struct usb_host_interface *iface_desc;
1941 struct usb_endpoint_descriptor *endpoint;
1942 int i;
1943
1944 iface_desc = &intf->altsetting[0];
1945
1946 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1947 endpoint = &iface_desc->endpoint[i].desc;
1948
1949 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1950 *in = endpoint;
1951
1952 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1953 *out = endpoint;
1954
1955 /* use first bulk endpoint for in and out */
1956 if (*in && *out)
1957 return 0;
1958 }
1959
1960 return -ENODEV;
1961 }
1962
1963 static int kvaser_usb_probe(struct usb_interface *intf,
1964 const struct usb_device_id *id)
1965 {
1966 struct kvaser_usb *dev;
1967 int err = -ENOMEM;
1968 int i, retry = 3;
1969
1970 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1971 if (!dev)
1972 return -ENOMEM;
1973
1974 if (kvaser_is_leaf(id)) {
1975 dev->family = KVASER_LEAF;
1976 } else if (kvaser_is_usbcan(id)) {
1977 dev->family = KVASER_USBCAN;
1978 } else {
1979 dev_err(&intf->dev,
1980 "Product ID (%d) does not belong to any known Kvaser USB family",
1981 id->idProduct);
1982 return -ENODEV;
1983 }
1984
1985 err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1986 if (err) {
1987 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
1988 return err;
1989 }
1990
1991 dev->udev = interface_to_usbdev(intf);
1992
1993 init_usb_anchor(&dev->rx_submitted);
1994
1995 usb_set_intfdata(intf, dev);
1996
1997 /* On some x86 laptops, plugging a Kvaser device again after
1998 * an unplug makes the firmware always ignore the very first
1999 * command. For such a case, provide some room for retries
2000 * instead of completely exiting the driver.
2001 */
2002 do {
2003 err = kvaser_usb_get_software_info(dev);
2004 } while (--retry && err == -ETIMEDOUT);
2005
2006 if (err) {
2007 dev_err(&intf->dev,
2008 "Cannot get software infos, error %d\n", err);
2009 return err;
2010 }
2011
2012 err = kvaser_usb_get_card_info(dev);
2013 if (err) {
2014 dev_err(&intf->dev,
2015 "Cannot get card infos, error %d\n", err);
2016 return err;
2017 }
2018
2019 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2020 ((dev->fw_version >> 24) & 0xff),
2021 ((dev->fw_version >> 16) & 0xff),
2022 (dev->fw_version & 0xffff));
2023
2024 for (i = 0; i < dev->nchannels; i++) {
2025 err = kvaser_usb_init_one(intf, id, i);
2026 if (err) {
2027 kvaser_usb_remove_interfaces(dev);
2028 return err;
2029 }
2030 }
2031
2032 return 0;
2033 }
2034
2035 static void kvaser_usb_disconnect(struct usb_interface *intf)
2036 {
2037 struct kvaser_usb *dev = usb_get_intfdata(intf);
2038
2039 usb_set_intfdata(intf, NULL);
2040
2041 if (!dev)
2042 return;
2043
2044 kvaser_usb_remove_interfaces(dev);
2045 }
2046
2047 static struct usb_driver kvaser_usb_driver = {
2048 .name = "kvaser_usb",
2049 .probe = kvaser_usb_probe,
2050 .disconnect = kvaser_usb_disconnect,
2051 .id_table = kvaser_usb_table,
2052 };
2053
2054 module_usb_driver(kvaser_usb_driver);
2055
2056 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2057 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2058 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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