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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / net / can / usb / kvaser_usb.c
blob63587b8e6825add0dadc75b6e446981935d18adb
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_RX_URBS 4
29 #define START_TIMEOUT 1000 /* msecs */
30 #define STOP_TIMEOUT 1000 /* msecs */
31 #define USB_SEND_TIMEOUT 1000 /* msecs */
32 #define USB_RECV_TIMEOUT 1000 /* msecs */
33 #define RX_BUFFER_SIZE 3072
34 #define CAN_USB_CLOCK 8000000
35 #define MAX_NET_DEVICES 3
36 #define MAX_USBCAN_NET_DEVICES 2
37
38 /* Kvaser Leaf USB devices */
39 #define KVASER_VENDOR_ID 0x0bfd
40 #define USB_LEAF_DEVEL_PRODUCT_ID 10
41 #define USB_LEAF_LITE_PRODUCT_ID 11
42 #define USB_LEAF_PRO_PRODUCT_ID 12
43 #define USB_LEAF_SPRO_PRODUCT_ID 14
44 #define USB_LEAF_PRO_LS_PRODUCT_ID 15
45 #define USB_LEAF_PRO_SWC_PRODUCT_ID 16
46 #define USB_LEAF_PRO_LIN_PRODUCT_ID 17
47 #define USB_LEAF_SPRO_LS_PRODUCT_ID 18
48 #define USB_LEAF_SPRO_SWC_PRODUCT_ID 19
49 #define USB_MEMO2_DEVEL_PRODUCT_ID 22
50 #define USB_MEMO2_HSHS_PRODUCT_ID 23
51 #define USB_UPRO_HSHS_PRODUCT_ID 24
52 #define USB_LEAF_LITE_GI_PRODUCT_ID 25
53 #define USB_LEAF_PRO_OBDII_PRODUCT_ID 26
54 #define USB_MEMO2_HSLS_PRODUCT_ID 27
55 #define USB_LEAF_LITE_CH_PRODUCT_ID 28
56 #define USB_BLACKBIRD_SPRO_PRODUCT_ID 29
57 #define USB_OEM_MERCURY_PRODUCT_ID 34
58 #define USB_OEM_LEAF_PRODUCT_ID 35
59 #define USB_CAN_R_PRODUCT_ID 39
60 #define USB_LEAF_LITE_V2_PRODUCT_ID 288
61 #define USB_MINI_PCIE_HS_PRODUCT_ID 289
62 #define USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID 290
63 #define USB_USBCAN_LIGHT_2HS_PRODUCT_ID 291
64 #define USB_MINI_PCIE_2HS_PRODUCT_ID 292
65
66 static inline bool kvaser_is_leaf(const struct usb_device_id *id)
67 {
68 return id->idProduct >= USB_LEAF_DEVEL_PRODUCT_ID &&
69 id->idProduct <= USB_MINI_PCIE_2HS_PRODUCT_ID;
70 }
71
72 /* Kvaser USBCan-II devices */
73 #define USB_USBCAN_REVB_PRODUCT_ID 2
74 #define USB_VCI2_PRODUCT_ID 3
75 #define USB_USBCAN2_PRODUCT_ID 4
76 #define USB_MEMORATOR_PRODUCT_ID 5
77
78 static inline bool kvaser_is_usbcan(const struct usb_device_id *id)
79 {
80 return id->idProduct >= USB_USBCAN_REVB_PRODUCT_ID &&
81 id->idProduct <= USB_MEMORATOR_PRODUCT_ID;
82 }
83
84 /* USB devices features */
85 #define KVASER_HAS_SILENT_MODE BIT(0)
86 #define KVASER_HAS_TXRX_ERRORS BIT(1)
87
88 /* Message header size */
89 #define MSG_HEADER_LEN 2
90
91 /* Can message flags */
92 #define MSG_FLAG_ERROR_FRAME BIT(0)
93 #define MSG_FLAG_OVERRUN BIT(1)
94 #define MSG_FLAG_NERR BIT(2)
95 #define MSG_FLAG_WAKEUP BIT(3)
96 #define MSG_FLAG_REMOTE_FRAME BIT(4)
97 #define MSG_FLAG_RESERVED BIT(5)
98 #define MSG_FLAG_TX_ACK BIT(6)
99 #define MSG_FLAG_TX_REQUEST BIT(7)
100
101 /* Can states (M16C CxSTRH register) */
102 #define M16C_STATE_BUS_RESET BIT(0)
103 #define M16C_STATE_BUS_ERROR BIT(4)
104 #define M16C_STATE_BUS_PASSIVE BIT(5)
105 #define M16C_STATE_BUS_OFF BIT(6)
106
107 /* Can msg ids */
108 #define CMD_RX_STD_MESSAGE 12
109 #define CMD_TX_STD_MESSAGE 13
110 #define CMD_RX_EXT_MESSAGE 14
111 #define CMD_TX_EXT_MESSAGE 15
112 #define CMD_SET_BUS_PARAMS 16
113 #define CMD_GET_BUS_PARAMS 17
114 #define CMD_GET_BUS_PARAMS_REPLY 18
115 #define CMD_GET_CHIP_STATE 19
116 #define CMD_CHIP_STATE_EVENT 20
117 #define CMD_SET_CTRL_MODE 21
118 #define CMD_GET_CTRL_MODE 22
119 #define CMD_GET_CTRL_MODE_REPLY 23
120 #define CMD_RESET_CHIP 24
121 #define CMD_RESET_CARD 25
122 #define CMD_START_CHIP 26
123 #define CMD_START_CHIP_REPLY 27
124 #define CMD_STOP_CHIP 28
125 #define CMD_STOP_CHIP_REPLY 29
126
127 #define CMD_LEAF_GET_CARD_INFO2 32
128 #define CMD_USBCAN_RESET_CLOCK 32
129 #define CMD_USBCAN_CLOCK_OVERFLOW_EVENT 33
130
131 #define CMD_GET_CARD_INFO 34
132 #define CMD_GET_CARD_INFO_REPLY 35
133 #define CMD_GET_SOFTWARE_INFO 38
134 #define CMD_GET_SOFTWARE_INFO_REPLY 39
135 #define CMD_ERROR_EVENT 45
136 #define CMD_FLUSH_QUEUE 48
137 #define CMD_RESET_ERROR_COUNTER 49
138 #define CMD_TX_ACKNOWLEDGE 50
139 #define CMD_CAN_ERROR_EVENT 51
140 #define CMD_FLUSH_QUEUE_REPLY 68
141
142 #define CMD_LEAF_USB_THROTTLE 77
143 #define CMD_LEAF_LOG_MESSAGE 106
144
145 /* error factors */
146 #define M16C_EF_ACKE BIT(0)
147 #define M16C_EF_CRCE BIT(1)
148 #define M16C_EF_FORME BIT(2)
149 #define M16C_EF_STFE BIT(3)
150 #define M16C_EF_BITE0 BIT(4)
151 #define M16C_EF_BITE1 BIT(5)
152 #define M16C_EF_RCVE BIT(6)
153 #define M16C_EF_TRE BIT(7)
154
155 /* Only Leaf-based devices can report M16C error factors,
156 * thus define our own error status flags for USBCANII
157 */
158 #define USBCAN_ERROR_STATE_NONE 0
159 #define USBCAN_ERROR_STATE_TX_ERROR BIT(0)
160 #define USBCAN_ERROR_STATE_RX_ERROR BIT(1)
161 #define USBCAN_ERROR_STATE_BUSERROR BIT(2)
162
163 /* bittiming parameters */
164 #define KVASER_USB_TSEG1_MIN 1
165 #define KVASER_USB_TSEG1_MAX 16
166 #define KVASER_USB_TSEG2_MIN 1
167 #define KVASER_USB_TSEG2_MAX 8
168 #define KVASER_USB_SJW_MAX 4
169 #define KVASER_USB_BRP_MIN 1
170 #define KVASER_USB_BRP_MAX 64
171 #define KVASER_USB_BRP_INC 1
172
173 /* ctrl modes */
174 #define KVASER_CTRL_MODE_NORMAL 1
175 #define KVASER_CTRL_MODE_SILENT 2
176 #define KVASER_CTRL_MODE_SELFRECEPTION 3
177 #define KVASER_CTRL_MODE_OFF 4
178
179 /* Extended CAN identifier flag */
180 #define KVASER_EXTENDED_FRAME BIT(31)
181
182 /* Kvaser USB CAN dongles are divided into two major families:
183 * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
184 * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
185 */
186 enum kvaser_usb_family {
187 KVASER_LEAF,
188 KVASER_USBCAN,
189 };
190
191 struct kvaser_msg_simple {
192 u8 tid;
193 u8 channel;
194 } __packed;
195
196 struct kvaser_msg_cardinfo {
197 u8 tid;
198 u8 nchannels;
199 union {
200 struct {
201 __le32 serial_number;
202 __le32 padding;
203 } __packed leaf0;
204 struct {
205 __le32 serial_number_low;
206 __le32 serial_number_high;
207 } __packed usbcan0;
208 } __packed;
209 __le32 clock_resolution;
210 __le32 mfgdate;
211 u8 ean[8];
212 u8 hw_revision;
213 union {
214 struct {
215 u8 usb_hs_mode;
216 } __packed leaf1;
217 struct {
218 u8 padding;
219 } __packed usbcan1;
220 } __packed;
221 __le16 padding;
222 } __packed;
223
224 struct kvaser_msg_cardinfo2 {
225 u8 tid;
226 u8 reserved;
227 u8 pcb_id[24];
228 __le32 oem_unlock_code;
229 } __packed;
230
231 struct leaf_msg_softinfo {
232 u8 tid;
233 u8 padding0;
234 __le32 sw_options;
235 __le32 fw_version;
236 __le16 max_outstanding_tx;
237 __le16 padding1[9];
238 } __packed;
239
240 struct usbcan_msg_softinfo {
241 u8 tid;
242 u8 fw_name[5];
243 __le16 max_outstanding_tx;
244 u8 padding[6];
245 __le32 fw_version;
246 __le16 checksum;
247 __le16 sw_options;
248 } __packed;
249
250 struct kvaser_msg_busparams {
251 u8 tid;
252 u8 channel;
253 __le32 bitrate;
254 u8 tseg1;
255 u8 tseg2;
256 u8 sjw;
257 u8 no_samp;
258 } __packed;
259
260 struct kvaser_msg_tx_can {
261 u8 channel;
262 u8 tid;
263 u8 msg[14];
264 union {
265 struct {
266 u8 padding;
267 u8 flags;
268 } __packed leaf;
269 struct {
270 u8 flags;
271 u8 padding;
272 } __packed usbcan;
273 } __packed;
274 } __packed;
275
276 struct kvaser_msg_rx_can_header {
277 u8 channel;
278 u8 flag;
279 } __packed;
280
281 struct leaf_msg_rx_can {
282 u8 channel;
283 u8 flag;
284
285 __le16 time[3];
286 u8 msg[14];
287 } __packed;
288
289 struct usbcan_msg_rx_can {
290 u8 channel;
291 u8 flag;
292
293 u8 msg[14];
294 __le16 time;
295 } __packed;
296
297 struct leaf_msg_chip_state_event {
298 u8 tid;
299 u8 channel;
300
301 __le16 time[3];
302 u8 tx_errors_count;
303 u8 rx_errors_count;
304
305 u8 status;
306 u8 padding[3];
307 } __packed;
308
309 struct usbcan_msg_chip_state_event {
310 u8 tid;
311 u8 channel;
312
313 u8 tx_errors_count;
314 u8 rx_errors_count;
315 __le16 time;
316
317 u8 status;
318 u8 padding[3];
319 } __packed;
320
321 struct kvaser_msg_tx_acknowledge_header {
322 u8 channel;
323 u8 tid;
324 } __packed;
325
326 struct leaf_msg_tx_acknowledge {
327 u8 channel;
328 u8 tid;
329
330 __le16 time[3];
331 u8 flags;
332 u8 time_offset;
333 } __packed;
334
335 struct usbcan_msg_tx_acknowledge {
336 u8 channel;
337 u8 tid;
338
339 __le16 time;
340 __le16 padding;
341 } __packed;
342
343 struct leaf_msg_error_event {
344 u8 tid;
345 u8 flags;
346 __le16 time[3];
347 u8 channel;
348 u8 padding;
349 u8 tx_errors_count;
350 u8 rx_errors_count;
351 u8 status;
352 u8 error_factor;
353 } __packed;
354
355 struct usbcan_msg_error_event {
356 u8 tid;
357 u8 padding;
358 u8 tx_errors_count_ch0;
359 u8 rx_errors_count_ch0;
360 u8 tx_errors_count_ch1;
361 u8 rx_errors_count_ch1;
362 u8 status_ch0;
363 u8 status_ch1;
364 __le16 time;
365 } __packed;
366
367 struct kvaser_msg_ctrl_mode {
368 u8 tid;
369 u8 channel;
370 u8 ctrl_mode;
371 u8 padding[3];
372 } __packed;
373
374 struct kvaser_msg_flush_queue {
375 u8 tid;
376 u8 channel;
377 u8 flags;
378 u8 padding[3];
379 } __packed;
380
381 struct leaf_msg_log_message {
382 u8 channel;
383 u8 flags;
384 __le16 time[3];
385 u8 dlc;
386 u8 time_offset;
387 __le32 id;
388 u8 data[8];
389 } __packed;
390
391 struct kvaser_msg {
392 u8 len;
393 u8 id;
394 union {
395 struct kvaser_msg_simple simple;
396 struct kvaser_msg_cardinfo cardinfo;
397 struct kvaser_msg_cardinfo2 cardinfo2;
398 struct kvaser_msg_busparams busparams;
399
400 struct kvaser_msg_rx_can_header rx_can_header;
401 struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
402
403 union {
404 struct leaf_msg_softinfo softinfo;
405 struct leaf_msg_rx_can rx_can;
406 struct leaf_msg_chip_state_event chip_state_event;
407 struct leaf_msg_tx_acknowledge tx_acknowledge;
408 struct leaf_msg_error_event error_event;
409 struct leaf_msg_log_message log_message;
410 } __packed leaf;
411
412 union {
413 struct usbcan_msg_softinfo softinfo;
414 struct usbcan_msg_rx_can rx_can;
415 struct usbcan_msg_chip_state_event chip_state_event;
416 struct usbcan_msg_tx_acknowledge tx_acknowledge;
417 struct usbcan_msg_error_event error_event;
418 } __packed usbcan;
419
420 struct kvaser_msg_tx_can tx_can;
421 struct kvaser_msg_ctrl_mode ctrl_mode;
422 struct kvaser_msg_flush_queue flush_queue;
423 } u;
424 } __packed;
425
426 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
427 * handling. Some discrepancies between the two families exist:
428 *
429 * - USBCAN firmware does not report M16C "error factors"
430 * - USBCAN controllers has difficulties reporting if the raised error
431 * event is for ch0 or ch1. They leave such arbitration to the OS
432 * driver by letting it compare error counters with previous values
433 * and decide the error event's channel. Thus for USBCAN, the channel
434 * field is only advisory.
435 */
436 struct kvaser_usb_error_summary {
437 u8 channel, status, txerr, rxerr;
438 union {
439 struct {
440 u8 error_factor;
441 } leaf;
442 struct {
443 u8 other_ch_status;
444 u8 error_state;
445 } usbcan;
446 };
447 };
448
449 /* Context for an outstanding, not yet ACKed, transmission */
450 struct kvaser_usb_tx_urb_context {
451 struct kvaser_usb_net_priv *priv;
452 u32 echo_index;
453 int dlc;
454 };
455
456 struct kvaser_usb {
457 struct usb_device *udev;
458 struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
459
460 struct usb_endpoint_descriptor *bulk_in, *bulk_out;
461 struct usb_anchor rx_submitted;
462
463 /* @max_tx_urbs: Firmware-reported maximum number of outstanding,
464 * not yet ACKed, transmissions on this device. This value is
465 * also used as a sentinel for marking free tx contexts.
466 */
467 u32 fw_version;
468 unsigned int nchannels;
469 unsigned int max_tx_urbs;
470 enum kvaser_usb_family family;
471
472 bool rxinitdone;
473 void *rxbuf[MAX_RX_URBS];
474 dma_addr_t rxbuf_dma[MAX_RX_URBS];
475 };
476
477 struct kvaser_usb_net_priv {
478 struct can_priv can;
479 struct can_berr_counter bec;
480
481 struct kvaser_usb *dev;
482 struct net_device *netdev;
483 int channel;
484
485 struct completion start_comp, stop_comp;
486 struct usb_anchor tx_submitted;
487
488 spinlock_t tx_contexts_lock;
489 int active_tx_contexts;
490 struct kvaser_usb_tx_urb_context tx_contexts[];
491 };
492
493 static const struct usb_device_id kvaser_usb_table[] = {
494 /* Leaf family IDs */
495 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
496 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
497 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
498 .driver_info = KVASER_HAS_TXRX_ERRORS |
499 KVASER_HAS_SILENT_MODE },
500 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
501 .driver_info = KVASER_HAS_TXRX_ERRORS |
502 KVASER_HAS_SILENT_MODE },
503 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
504 .driver_info = KVASER_HAS_TXRX_ERRORS |
505 KVASER_HAS_SILENT_MODE },
506 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
507 .driver_info = KVASER_HAS_TXRX_ERRORS |
508 KVASER_HAS_SILENT_MODE },
509 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
510 .driver_info = KVASER_HAS_TXRX_ERRORS |
511 KVASER_HAS_SILENT_MODE },
512 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
513 .driver_info = KVASER_HAS_TXRX_ERRORS |
514 KVASER_HAS_SILENT_MODE },
515 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
516 .driver_info = KVASER_HAS_TXRX_ERRORS |
517 KVASER_HAS_SILENT_MODE },
518 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
519 .driver_info = KVASER_HAS_TXRX_ERRORS |
520 KVASER_HAS_SILENT_MODE },
521 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
522 .driver_info = KVASER_HAS_TXRX_ERRORS |
523 KVASER_HAS_SILENT_MODE },
524 { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
525 .driver_info = KVASER_HAS_TXRX_ERRORS },
526 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
527 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
528 .driver_info = KVASER_HAS_TXRX_ERRORS |
529 KVASER_HAS_SILENT_MODE },
530 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
531 .driver_info = KVASER_HAS_TXRX_ERRORS },
532 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
533 .driver_info = KVASER_HAS_TXRX_ERRORS },
534 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
535 .driver_info = KVASER_HAS_TXRX_ERRORS },
536 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
537 .driver_info = KVASER_HAS_TXRX_ERRORS },
538 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
539 .driver_info = KVASER_HAS_TXRX_ERRORS },
540 { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
541 .driver_info = KVASER_HAS_TXRX_ERRORS },
542 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
543 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
544 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID) },
545 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID) },
546 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID) },
547
548 /* USBCANII family IDs */
549 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
550 .driver_info = KVASER_HAS_TXRX_ERRORS },
551 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
552 .driver_info = KVASER_HAS_TXRX_ERRORS },
553 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
554 .driver_info = KVASER_HAS_TXRX_ERRORS },
555 { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
556 .driver_info = KVASER_HAS_TXRX_ERRORS },
557
558 { }
559 };
560 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
561
562 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
563 struct kvaser_msg *msg)
564 {
565 int actual_len;
566
567 return usb_bulk_msg(dev->udev,
568 usb_sndbulkpipe(dev->udev,
569 dev->bulk_out->bEndpointAddress),
570 msg, msg->len, &actual_len,
571 USB_SEND_TIMEOUT);
572 }
573
574 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
575 struct kvaser_msg *msg)
576 {
577 struct kvaser_msg *tmp;
578 void *buf;
579 int actual_len;
580 int err;
581 int pos;
582 unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
583
584 buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
585 if (!buf)
586 return -ENOMEM;
587
588 do {
589 err = usb_bulk_msg(dev->udev,
590 usb_rcvbulkpipe(dev->udev,
591 dev->bulk_in->bEndpointAddress),
592 buf, RX_BUFFER_SIZE, &actual_len,
593 USB_RECV_TIMEOUT);
594 if (err < 0)
595 goto end;
596
597 pos = 0;
598 while (pos <= actual_len - MSG_HEADER_LEN) {
599 tmp = buf + pos;
600
601 /* Handle messages crossing the USB endpoint max packet
602 * size boundary. Check kvaser_usb_read_bulk_callback()
603 * for further details.
604 */
605 if (tmp->len == 0) {
606 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
607 wMaxPacketSize));
608 continue;
609 }
610
611 if (pos + tmp->len > actual_len) {
612 dev_err_ratelimited(dev->udev->dev.parent,
613 "Format error\n");
614 break;
615 }
616
617 if (tmp->id == id) {
618 memcpy(msg, tmp, tmp->len);
619 goto end;
620 }
621
622 pos += tmp->len;
623 }
624 } while (time_before(jiffies, to));
625
626 err = -EINVAL;
627
628 end:
629 kfree(buf);
630
631 return err;
632 }
633
634 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
635 u8 msg_id, int channel)
636 {
637 struct kvaser_msg *msg;
638 int rc;
639
640 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
641 if (!msg)
642 return -ENOMEM;
643
644 msg->id = msg_id;
645 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
646 msg->u.simple.channel = channel;
647 msg->u.simple.tid = 0xff;
648
649 rc = kvaser_usb_send_msg(dev, msg);
650
651 kfree(msg);
652 return rc;
653 }
654
655 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
656 {
657 struct kvaser_msg msg;
658 int err;
659
660 err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
661 if (err)
662 return err;
663
664 err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
665 if (err)
666 return err;
667
668 switch (dev->family) {
669 case KVASER_LEAF:
670 dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
671 dev->max_tx_urbs =
672 le16_to_cpu(msg.u.leaf.softinfo.max_outstanding_tx);
673 break;
674 case KVASER_USBCAN:
675 dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
676 dev->max_tx_urbs =
677 le16_to_cpu(msg.u.usbcan.softinfo.max_outstanding_tx);
678 break;
679 }
680
681 return 0;
682 }
683
684 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
685 {
686 struct kvaser_msg msg;
687 int err;
688
689 err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
690 if (err)
691 return err;
692
693 err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
694 if (err)
695 return err;
696
697 dev->nchannels = msg.u.cardinfo.nchannels;
698 if ((dev->nchannels > MAX_NET_DEVICES) ||
699 (dev->family == KVASER_USBCAN &&
700 dev->nchannels > MAX_USBCAN_NET_DEVICES))
701 return -EINVAL;
702
703 return 0;
704 }
705
706 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
707 const struct kvaser_msg *msg)
708 {
709 struct net_device_stats *stats;
710 struct kvaser_usb_tx_urb_context *context;
711 struct kvaser_usb_net_priv *priv;
712 struct sk_buff *skb;
713 struct can_frame *cf;
714 unsigned long flags;
715 u8 channel, tid;
716
717 channel = msg->u.tx_acknowledge_header.channel;
718 tid = msg->u.tx_acknowledge_header.tid;
719
720 if (channel >= dev->nchannels) {
721 dev_err(dev->udev->dev.parent,
722 "Invalid channel number (%d)\n", channel);
723 return;
724 }
725
726 priv = dev->nets[channel];
727
728 if (!netif_device_present(priv->netdev))
729 return;
730
731 stats = &priv->netdev->stats;
732
733 context = &priv->tx_contexts[tid % dev->max_tx_urbs];
734
735 /* Sometimes the state change doesn't come after a bus-off event */
736 if (priv->can.restart_ms &&
737 (priv->can.state >= CAN_STATE_BUS_OFF)) {
738 skb = alloc_can_err_skb(priv->netdev, &cf);
739 if (skb) {
740 cf->can_id |= CAN_ERR_RESTARTED;
741
742 stats->rx_packets++;
743 stats->rx_bytes += cf->can_dlc;
744 netif_rx(skb);
745 } else {
746 netdev_err(priv->netdev,
747 "No memory left for err_skb\n");
748 }
749
750 priv->can.can_stats.restarts++;
751 netif_carrier_on(priv->netdev);
752
753 priv->can.state = CAN_STATE_ERROR_ACTIVE;
754 }
755
756 stats->tx_packets++;
757 stats->tx_bytes += context->dlc;
758
759 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
760
761 can_get_echo_skb(priv->netdev, context->echo_index);
762 context->echo_index = dev->max_tx_urbs;
763 --priv->active_tx_contexts;
764 netif_wake_queue(priv->netdev);
765
766 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
767 }
768
769 static void kvaser_usb_simple_msg_callback(struct urb *urb)
770 {
771 struct net_device *netdev = urb->context;
772
773 kfree(urb->transfer_buffer);
774
775 if (urb->status)
776 netdev_warn(netdev, "urb status received: %d\n",
777 urb->status);
778 }
779
780 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
781 u8 msg_id)
782 {
783 struct kvaser_usb *dev = priv->dev;
784 struct net_device *netdev = priv->netdev;
785 struct kvaser_msg *msg;
786 struct urb *urb;
787 void *buf;
788 int err;
789
790 urb = usb_alloc_urb(0, GFP_ATOMIC);
791 if (!urb)
792 return -ENOMEM;
793
794 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
795 if (!buf) {
796 usb_free_urb(urb);
797 return -ENOMEM;
798 }
799
800 msg = (struct kvaser_msg *)buf;
801 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
802 msg->id = msg_id;
803 msg->u.simple.channel = priv->channel;
804
805 usb_fill_bulk_urb(urb, dev->udev,
806 usb_sndbulkpipe(dev->udev,
807 dev->bulk_out->bEndpointAddress),
808 buf, msg->len,
809 kvaser_usb_simple_msg_callback, netdev);
810 usb_anchor_urb(urb, &priv->tx_submitted);
811
812 err = usb_submit_urb(urb, GFP_ATOMIC);
813 if (err) {
814 netdev_err(netdev, "Error transmitting URB\n");
815 usb_unanchor_urb(urb);
816 kfree(buf);
817 usb_free_urb(urb);
818 return err;
819 }
820
821 usb_free_urb(urb);
822
823 return 0;
824 }
825
826 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
827 const struct kvaser_usb_error_summary *es,
828 struct can_frame *cf)
829 {
830 struct kvaser_usb *dev = priv->dev;
831 struct net_device_stats *stats = &priv->netdev->stats;
832 enum can_state cur_state, new_state, tx_state, rx_state;
833
834 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
835
836 new_state = cur_state = priv->can.state;
837
838 if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
839 new_state = CAN_STATE_BUS_OFF;
840 else if (es->status & M16C_STATE_BUS_PASSIVE)
841 new_state = CAN_STATE_ERROR_PASSIVE;
842 else if (es->status & M16C_STATE_BUS_ERROR) {
843 /* Guard against spurious error events after a busoff */
844 if (cur_state < CAN_STATE_BUS_OFF) {
845 if ((es->txerr >= 128) || (es->rxerr >= 128))
846 new_state = CAN_STATE_ERROR_PASSIVE;
847 else if ((es->txerr >= 96) || (es->rxerr >= 96))
848 new_state = CAN_STATE_ERROR_WARNING;
849 else if (cur_state > CAN_STATE_ERROR_ACTIVE)
850 new_state = CAN_STATE_ERROR_ACTIVE;
851 }
852 }
853
854 if (!es->status)
855 new_state = CAN_STATE_ERROR_ACTIVE;
856
857 if (new_state != cur_state) {
858 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
859 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
860
861 can_change_state(priv->netdev, cf, tx_state, rx_state);
862 }
863
864 if (priv->can.restart_ms &&
865 (cur_state >= CAN_STATE_BUS_OFF) &&
866 (new_state < CAN_STATE_BUS_OFF)) {
867 priv->can.can_stats.restarts++;
868 }
869
870 switch (dev->family) {
871 case KVASER_LEAF:
872 if (es->leaf.error_factor) {
873 priv->can.can_stats.bus_error++;
874 stats->rx_errors++;
875 }
876 break;
877 case KVASER_USBCAN:
878 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
879 stats->tx_errors++;
880 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
881 stats->rx_errors++;
882 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
883 priv->can.can_stats.bus_error++;
884 }
885 break;
886 }
887
888 priv->bec.txerr = es->txerr;
889 priv->bec.rxerr = es->rxerr;
890 }
891
892 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
893 const struct kvaser_usb_error_summary *es)
894 {
895 struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
896 struct sk_buff *skb;
897 struct net_device_stats *stats;
898 struct kvaser_usb_net_priv *priv;
899 enum can_state old_state, new_state;
900
901 if (es->channel >= dev->nchannels) {
902 dev_err(dev->udev->dev.parent,
903 "Invalid channel number (%d)\n", es->channel);
904 return;
905 }
906
907 priv = dev->nets[es->channel];
908 stats = &priv->netdev->stats;
909
910 /* Update all of the can interface's state and error counters before
911 * trying any memory allocation that can actually fail with -ENOMEM.
912 *
913 * We send a temporary stack-allocated error can frame to
914 * can_change_state() for the very same reason.
915 *
916 * TODO: Split can_change_state() responsibility between updating the
917 * can interface's state and counters, and the setting up of can error
918 * frame ID and data to userspace. Remove stack allocation afterwards.
919 */
920 old_state = priv->can.state;
921 kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
922 new_state = priv->can.state;
923
924 skb = alloc_can_err_skb(priv->netdev, &cf);
925 if (!skb) {
926 stats->rx_dropped++;
927 return;
928 }
929 memcpy(cf, &tmp_cf, sizeof(*cf));
930
931 if (new_state != old_state) {
932 if (es->status &
933 (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
934 if (!priv->can.restart_ms)
935 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
936 netif_carrier_off(priv->netdev);
937 }
938
939 if (priv->can.restart_ms &&
940 (old_state >= CAN_STATE_BUS_OFF) &&
941 (new_state < CAN_STATE_BUS_OFF)) {
942 cf->can_id |= CAN_ERR_RESTARTED;
943 netif_carrier_on(priv->netdev);
944 }
945 }
946
947 switch (dev->family) {
948 case KVASER_LEAF:
949 if (es->leaf.error_factor) {
950 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
951
952 if (es->leaf.error_factor & M16C_EF_ACKE)
953 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
954 if (es->leaf.error_factor & M16C_EF_CRCE)
955 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
956 if (es->leaf.error_factor & M16C_EF_FORME)
957 cf->data[2] |= CAN_ERR_PROT_FORM;
958 if (es->leaf.error_factor & M16C_EF_STFE)
959 cf->data[2] |= CAN_ERR_PROT_STUFF;
960 if (es->leaf.error_factor & M16C_EF_BITE0)
961 cf->data[2] |= CAN_ERR_PROT_BIT0;
962 if (es->leaf.error_factor & M16C_EF_BITE1)
963 cf->data[2] |= CAN_ERR_PROT_BIT1;
964 if (es->leaf.error_factor & M16C_EF_TRE)
965 cf->data[2] |= CAN_ERR_PROT_TX;
966 }
967 break;
968 case KVASER_USBCAN:
969 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
970 cf->can_id |= CAN_ERR_BUSERROR;
971 }
972 break;
973 }
974
975 cf->data[6] = es->txerr;
976 cf->data[7] = es->rxerr;
977
978 stats->rx_packets++;
979 stats->rx_bytes += cf->can_dlc;
980 netif_rx(skb);
981 }
982
983 /* For USBCAN, report error to userspace iff the channels's errors counter
984 * has changed, or we're the only channel seeing a bus error state.
985 */
986 static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
987 struct kvaser_usb_error_summary *es)
988 {
989 struct kvaser_usb_net_priv *priv;
990 int channel;
991 bool report_error;
992
993 channel = es->channel;
994 if (channel >= dev->nchannels) {
995 dev_err(dev->udev->dev.parent,
996 "Invalid channel number (%d)\n", channel);
997 return;
998 }
999
1000 priv = dev->nets[channel];
1001 report_error = false;
1002
1003 if (es->txerr != priv->bec.txerr) {
1004 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
1005 report_error = true;
1006 }
1007 if (es->rxerr != priv->bec.rxerr) {
1008 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
1009 report_error = true;
1010 }
1011 if ((es->status & M16C_STATE_BUS_ERROR) &&
1012 !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
1013 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
1014 report_error = true;
1015 }
1016
1017 if (report_error)
1018 kvaser_usb_rx_error(dev, es);
1019 }
1020
1021 static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
1022 const struct kvaser_msg *msg)
1023 {
1024 struct kvaser_usb_error_summary es = { };
1025
1026 switch (msg->id) {
1027 /* Sometimes errors are sent as unsolicited chip state events */
1028 case CMD_CHIP_STATE_EVENT:
1029 es.channel = msg->u.usbcan.chip_state_event.channel;
1030 es.status = msg->u.usbcan.chip_state_event.status;
1031 es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
1032 es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
1033 kvaser_usbcan_conditionally_rx_error(dev, &es);
1034 break;
1035
1036 case CMD_CAN_ERROR_EVENT:
1037 es.channel = 0;
1038 es.status = msg->u.usbcan.error_event.status_ch0;
1039 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
1040 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
1041 es.usbcan.other_ch_status =
1042 msg->u.usbcan.error_event.status_ch1;
1043 kvaser_usbcan_conditionally_rx_error(dev, &es);
1044
1045 /* The USBCAN firmware supports up to 2 channels.
1046 * Now that ch0 was checked, check if ch1 has any errors.
1047 */
1048 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1049 es.channel = 1;
1050 es.status = msg->u.usbcan.error_event.status_ch1;
1051 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
1052 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
1053 es.usbcan.other_ch_status =
1054 msg->u.usbcan.error_event.status_ch0;
1055 kvaser_usbcan_conditionally_rx_error(dev, &es);
1056 }
1057 break;
1058
1059 default:
1060 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1061 msg->id);
1062 }
1063 }
1064
1065 static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
1066 const struct kvaser_msg *msg)
1067 {
1068 struct kvaser_usb_error_summary es = { };
1069
1070 switch (msg->id) {
1071 case CMD_CAN_ERROR_EVENT:
1072 es.channel = msg->u.leaf.error_event.channel;
1073 es.status = msg->u.leaf.error_event.status;
1074 es.txerr = msg->u.leaf.error_event.tx_errors_count;
1075 es.rxerr = msg->u.leaf.error_event.rx_errors_count;
1076 es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
1077 break;
1078 case CMD_LEAF_LOG_MESSAGE:
1079 es.channel = msg->u.leaf.log_message.channel;
1080 es.status = msg->u.leaf.log_message.data[0];
1081 es.txerr = msg->u.leaf.log_message.data[2];
1082 es.rxerr = msg->u.leaf.log_message.data[3];
1083 es.leaf.error_factor = msg->u.leaf.log_message.data[1];
1084 break;
1085 case CMD_CHIP_STATE_EVENT:
1086 es.channel = msg->u.leaf.chip_state_event.channel;
1087 es.status = msg->u.leaf.chip_state_event.status;
1088 es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
1089 es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
1090 es.leaf.error_factor = 0;
1091 break;
1092 default:
1093 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1094 msg->id);
1095 return;
1096 }
1097
1098 kvaser_usb_rx_error(dev, &es);
1099 }
1100
1101 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
1102 const struct kvaser_msg *msg)
1103 {
1104 struct can_frame *cf;
1105 struct sk_buff *skb;
1106 struct net_device_stats *stats = &priv->netdev->stats;
1107
1108 if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1109 MSG_FLAG_NERR)) {
1110 netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
1111 msg->u.rx_can_header.flag);
1112
1113 stats->rx_errors++;
1114 return;
1115 }
1116
1117 if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
1118 stats->rx_over_errors++;
1119 stats->rx_errors++;
1120
1121 skb = alloc_can_err_skb(priv->netdev, &cf);
1122 if (!skb) {
1123 stats->rx_dropped++;
1124 return;
1125 }
1126
1127 cf->can_id |= CAN_ERR_CRTL;
1128 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
1129
1130 stats->rx_packets++;
1131 stats->rx_bytes += cf->can_dlc;
1132 netif_rx(skb);
1133 }
1134 }
1135
1136 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
1137 const struct kvaser_msg *msg)
1138 {
1139 struct kvaser_usb_net_priv *priv;
1140 struct can_frame *cf;
1141 struct sk_buff *skb;
1142 struct net_device_stats *stats;
1143 u8 channel = msg->u.rx_can_header.channel;
1144 const u8 *rx_msg = NULL; /* GCC */
1145
1146 if (channel >= dev->nchannels) {
1147 dev_err(dev->udev->dev.parent,
1148 "Invalid channel number (%d)\n", channel);
1149 return;
1150 }
1151
1152 priv = dev->nets[channel];
1153 stats = &priv->netdev->stats;
1154
1155 if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1156 (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
1157 kvaser_leaf_rx_error(dev, msg);
1158 return;
1159 } else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1160 MSG_FLAG_NERR |
1161 MSG_FLAG_OVERRUN)) {
1162 kvaser_usb_rx_can_err(priv, msg);
1163 return;
1164 } else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1165 netdev_warn(priv->netdev,
1166 "Unhandled frame (flags: 0x%02x)",
1167 msg->u.rx_can_header.flag);
1168 return;
1169 }
1170
1171 switch (dev->family) {
1172 case KVASER_LEAF:
1173 rx_msg = msg->u.leaf.rx_can.msg;
1174 break;
1175 case KVASER_USBCAN:
1176 rx_msg = msg->u.usbcan.rx_can.msg;
1177 break;
1178 }
1179
1180 skb = alloc_can_skb(priv->netdev, &cf);
1181 if (!skb) {
1182 stats->tx_dropped++;
1183 return;
1184 }
1185
1186 if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
1187 cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
1188 if (cf->can_id & KVASER_EXTENDED_FRAME)
1189 cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1190 else
1191 cf->can_id &= CAN_SFF_MASK;
1192
1193 cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
1194
1195 if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1196 cf->can_id |= CAN_RTR_FLAG;
1197 else
1198 memcpy(cf->data, &msg->u.leaf.log_message.data,
1199 cf->can_dlc);
1200 } else {
1201 cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
1202
1203 if (msg->id == CMD_RX_EXT_MESSAGE) {
1204 cf->can_id <<= 18;
1205 cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
1206 ((rx_msg[3] & 0xff) << 6) |
1207 (rx_msg[4] & 0x3f);
1208 cf->can_id |= CAN_EFF_FLAG;
1209 }
1210
1211 cf->can_dlc = get_can_dlc(rx_msg[5]);
1212
1213 if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1214 cf->can_id |= CAN_RTR_FLAG;
1215 else
1216 memcpy(cf->data, &rx_msg[6],
1217 cf->can_dlc);
1218 }
1219
1220 stats->rx_packets++;
1221 stats->rx_bytes += cf->can_dlc;
1222 netif_rx(skb);
1223 }
1224
1225 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
1226 const struct kvaser_msg *msg)
1227 {
1228 struct kvaser_usb_net_priv *priv;
1229 u8 channel = msg->u.simple.channel;
1230
1231 if (channel >= dev->nchannels) {
1232 dev_err(dev->udev->dev.parent,
1233 "Invalid channel number (%d)\n", channel);
1234 return;
1235 }
1236
1237 priv = dev->nets[channel];
1238
1239 if (completion_done(&priv->start_comp) &&
1240 netif_queue_stopped(priv->netdev)) {
1241 netif_wake_queue(priv->netdev);
1242 } else {
1243 netif_start_queue(priv->netdev);
1244 complete(&priv->start_comp);
1245 }
1246 }
1247
1248 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
1249 const struct kvaser_msg *msg)
1250 {
1251 struct kvaser_usb_net_priv *priv;
1252 u8 channel = msg->u.simple.channel;
1253
1254 if (channel >= dev->nchannels) {
1255 dev_err(dev->udev->dev.parent,
1256 "Invalid channel number (%d)\n", channel);
1257 return;
1258 }
1259
1260 priv = dev->nets[channel];
1261
1262 complete(&priv->stop_comp);
1263 }
1264
1265 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
1266 const struct kvaser_msg *msg)
1267 {
1268 switch (msg->id) {
1269 case CMD_START_CHIP_REPLY:
1270 kvaser_usb_start_chip_reply(dev, msg);
1271 break;
1272
1273 case CMD_STOP_CHIP_REPLY:
1274 kvaser_usb_stop_chip_reply(dev, msg);
1275 break;
1276
1277 case CMD_RX_STD_MESSAGE:
1278 case CMD_RX_EXT_MESSAGE:
1279 kvaser_usb_rx_can_msg(dev, msg);
1280 break;
1281
1282 case CMD_LEAF_LOG_MESSAGE:
1283 if (dev->family != KVASER_LEAF)
1284 goto warn;
1285 kvaser_usb_rx_can_msg(dev, msg);
1286 break;
1287
1288 case CMD_CHIP_STATE_EVENT:
1289 case CMD_CAN_ERROR_EVENT:
1290 if (dev->family == KVASER_LEAF)
1291 kvaser_leaf_rx_error(dev, msg);
1292 else
1293 kvaser_usbcan_rx_error(dev, msg);
1294 break;
1295
1296 case CMD_TX_ACKNOWLEDGE:
1297 kvaser_usb_tx_acknowledge(dev, msg);
1298 break;
1299
1300 /* Ignored messages */
1301 case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1302 if (dev->family != KVASER_USBCAN)
1303 goto warn;
1304 break;
1305
1306 case CMD_FLUSH_QUEUE_REPLY:
1307 if (dev->family != KVASER_LEAF)
1308 goto warn;
1309 break;
1310
1311 default:
1312 warn: dev_warn(dev->udev->dev.parent,
1313 "Unhandled message (%d)\n", msg->id);
1314 break;
1315 }
1316 }
1317
1318 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1319 {
1320 struct kvaser_usb *dev = urb->context;
1321 struct kvaser_msg *msg;
1322 int pos = 0;
1323 int err, i;
1324
1325 switch (urb->status) {
1326 case 0:
1327 break;
1328 case -ENOENT:
1329 case -EPIPE:
1330 case -EPROTO:
1331 case -ESHUTDOWN:
1332 return;
1333 default:
1334 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1335 urb->status);
1336 goto resubmit_urb;
1337 }
1338
1339 while (pos <= (int)(urb->actual_length - MSG_HEADER_LEN)) {
1340 msg = urb->transfer_buffer + pos;
1341
1342 /* The Kvaser firmware can only read and write messages that
1343 * does not cross the USB's endpoint wMaxPacketSize boundary.
1344 * If a follow-up command crosses such boundary, firmware puts
1345 * a placeholder zero-length command in its place then aligns
1346 * the real command to the next max packet size.
1347 *
1348 * Handle such cases or we're going to miss a significant
1349 * number of events in case of a heavy rx load on the bus.
1350 */
1351 if (msg->len == 0) {
1352 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
1353 wMaxPacketSize));
1354 continue;
1355 }
1356
1357 if (pos + msg->len > urb->actual_length) {
1358 dev_err_ratelimited(dev->udev->dev.parent,
1359 "Format error\n");
1360 break;
1361 }
1362
1363 kvaser_usb_handle_message(dev, msg);
1364 pos += msg->len;
1365 }
1366
1367 resubmit_urb:
1368 usb_fill_bulk_urb(urb, dev->udev,
1369 usb_rcvbulkpipe(dev->udev,
1370 dev->bulk_in->bEndpointAddress),
1371 urb->transfer_buffer, RX_BUFFER_SIZE,
1372 kvaser_usb_read_bulk_callback, dev);
1373
1374 err = usb_submit_urb(urb, GFP_ATOMIC);
1375 if (err == -ENODEV) {
1376 for (i = 0; i < dev->nchannels; i++) {
1377 if (!dev->nets[i])
1378 continue;
1379
1380 netif_device_detach(dev->nets[i]->netdev);
1381 }
1382 } else if (err) {
1383 dev_err(dev->udev->dev.parent,
1384 "Failed resubmitting read bulk urb: %d\n", err);
1385 }
1386
1387 return;
1388 }
1389
1390 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1391 {
1392 int i, err = 0;
1393
1394 if (dev->rxinitdone)
1395 return 0;
1396
1397 for (i = 0; i < MAX_RX_URBS; i++) {
1398 struct urb *urb = NULL;
1399 u8 *buf = NULL;
1400 dma_addr_t buf_dma;
1401
1402 urb = usb_alloc_urb(0, GFP_KERNEL);
1403 if (!urb) {
1404 err = -ENOMEM;
1405 break;
1406 }
1407
1408 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1409 GFP_KERNEL, &buf_dma);
1410 if (!buf) {
1411 dev_warn(dev->udev->dev.parent,
1412 "No memory left for USB buffer\n");
1413 usb_free_urb(urb);
1414 err = -ENOMEM;
1415 break;
1416 }
1417
1418 usb_fill_bulk_urb(urb, dev->udev,
1419 usb_rcvbulkpipe(dev->udev,
1420 dev->bulk_in->bEndpointAddress),
1421 buf, RX_BUFFER_SIZE,
1422 kvaser_usb_read_bulk_callback,
1423 dev);
1424 urb->transfer_dma = buf_dma;
1425 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1426 usb_anchor_urb(urb, &dev->rx_submitted);
1427
1428 err = usb_submit_urb(urb, GFP_KERNEL);
1429 if (err) {
1430 usb_unanchor_urb(urb);
1431 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1432 buf_dma);
1433 usb_free_urb(urb);
1434 break;
1435 }
1436
1437 dev->rxbuf[i] = buf;
1438 dev->rxbuf_dma[i] = buf_dma;
1439
1440 usb_free_urb(urb);
1441 }
1442
1443 if (i == 0) {
1444 dev_warn(dev->udev->dev.parent,
1445 "Cannot setup read URBs, error %d\n", err);
1446 return err;
1447 } else if (i < MAX_RX_URBS) {
1448 dev_warn(dev->udev->dev.parent,
1449 "RX performances may be slow\n");
1450 }
1451
1452 dev->rxinitdone = true;
1453
1454 return 0;
1455 }
1456
1457 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1458 {
1459 struct kvaser_msg *msg;
1460 int rc;
1461
1462 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1463 if (!msg)
1464 return -ENOMEM;
1465
1466 msg->id = CMD_SET_CTRL_MODE;
1467 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1468 msg->u.ctrl_mode.tid = 0xff;
1469 msg->u.ctrl_mode.channel = priv->channel;
1470
1471 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1472 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1473 else
1474 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1475
1476 rc = kvaser_usb_send_msg(priv->dev, msg);
1477
1478 kfree(msg);
1479 return rc;
1480 }
1481
1482 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1483 {
1484 int err;
1485
1486 init_completion(&priv->start_comp);
1487
1488 err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1489 priv->channel);
1490 if (err)
1491 return err;
1492
1493 if (!wait_for_completion_timeout(&priv->start_comp,
1494 msecs_to_jiffies(START_TIMEOUT)))
1495 return -ETIMEDOUT;
1496
1497 return 0;
1498 }
1499
1500 static int kvaser_usb_open(struct net_device *netdev)
1501 {
1502 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1503 struct kvaser_usb *dev = priv->dev;
1504 int err;
1505
1506 err = open_candev(netdev);
1507 if (err)
1508 return err;
1509
1510 err = kvaser_usb_setup_rx_urbs(dev);
1511 if (err)
1512 goto error;
1513
1514 err = kvaser_usb_set_opt_mode(priv);
1515 if (err)
1516 goto error;
1517
1518 err = kvaser_usb_start_chip(priv);
1519 if (err) {
1520 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1521 goto error;
1522 }
1523
1524 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1525
1526 return 0;
1527
1528 error:
1529 close_candev(netdev);
1530 return err;
1531 }
1532
1533 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1534 {
1535 int i, max_tx_urbs;
1536
1537 max_tx_urbs = priv->dev->max_tx_urbs;
1538
1539 priv->active_tx_contexts = 0;
1540 for (i = 0; i < max_tx_urbs; i++)
1541 priv->tx_contexts[i].echo_index = max_tx_urbs;
1542 }
1543
1544 /* This method might sleep. Do not call it in the atomic context
1545 * of URB completions.
1546 */
1547 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1548 {
1549 usb_kill_anchored_urbs(&priv->tx_submitted);
1550 kvaser_usb_reset_tx_urb_contexts(priv);
1551 }
1552
1553 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1554 {
1555 int i;
1556
1557 usb_kill_anchored_urbs(&dev->rx_submitted);
1558
1559 for (i = 0; i < MAX_RX_URBS; i++)
1560 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1561 dev->rxbuf[i],
1562 dev->rxbuf_dma[i]);
1563
1564 for (i = 0; i < dev->nchannels; i++) {
1565 struct kvaser_usb_net_priv *priv = dev->nets[i];
1566
1567 if (priv)
1568 kvaser_usb_unlink_tx_urbs(priv);
1569 }
1570 }
1571
1572 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1573 {
1574 int err;
1575
1576 init_completion(&priv->stop_comp);
1577
1578 err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1579 priv->channel);
1580 if (err)
1581 return err;
1582
1583 if (!wait_for_completion_timeout(&priv->stop_comp,
1584 msecs_to_jiffies(STOP_TIMEOUT)))
1585 return -ETIMEDOUT;
1586
1587 return 0;
1588 }
1589
1590 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1591 {
1592 struct kvaser_msg *msg;
1593 int rc;
1594
1595 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1596 if (!msg)
1597 return -ENOMEM;
1598
1599 msg->id = CMD_FLUSH_QUEUE;
1600 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1601 msg->u.flush_queue.channel = priv->channel;
1602 msg->u.flush_queue.flags = 0x00;
1603
1604 rc = kvaser_usb_send_msg(priv->dev, msg);
1605
1606 kfree(msg);
1607 return rc;
1608 }
1609
1610 static int kvaser_usb_close(struct net_device *netdev)
1611 {
1612 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1613 struct kvaser_usb *dev = priv->dev;
1614 int err;
1615
1616 netif_stop_queue(netdev);
1617
1618 err = kvaser_usb_flush_queue(priv);
1619 if (err)
1620 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1621
1622 err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel);
1623 if (err)
1624 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1625
1626 err = kvaser_usb_stop_chip(priv);
1627 if (err)
1628 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1629
1630 /* reset tx contexts */
1631 kvaser_usb_unlink_tx_urbs(priv);
1632
1633 priv->can.state = CAN_STATE_STOPPED;
1634 close_candev(priv->netdev);
1635
1636 return 0;
1637 }
1638
1639 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1640 {
1641 struct kvaser_usb_tx_urb_context *context = urb->context;
1642 struct kvaser_usb_net_priv *priv;
1643 struct net_device *netdev;
1644
1645 if (WARN_ON(!context))
1646 return;
1647
1648 priv = context->priv;
1649 netdev = priv->netdev;
1650
1651 kfree(urb->transfer_buffer);
1652
1653 if (!netif_device_present(netdev))
1654 return;
1655
1656 if (urb->status)
1657 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1658 }
1659
1660 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1661 struct net_device *netdev)
1662 {
1663 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1664 struct kvaser_usb *dev = priv->dev;
1665 struct net_device_stats *stats = &netdev->stats;
1666 struct can_frame *cf = (struct can_frame *)skb->data;
1667 struct kvaser_usb_tx_urb_context *context = NULL;
1668 struct urb *urb;
1669 void *buf;
1670 struct kvaser_msg *msg;
1671 int i, err, ret = NETDEV_TX_OK;
1672 u8 *msg_tx_can_flags = NULL; /* GCC */
1673 unsigned long flags;
1674
1675 if (can_dropped_invalid_skb(netdev, skb))
1676 return NETDEV_TX_OK;
1677
1678 urb = usb_alloc_urb(0, GFP_ATOMIC);
1679 if (!urb) {
1680 stats->tx_dropped++;
1681 dev_kfree_skb(skb);
1682 return NETDEV_TX_OK;
1683 }
1684
1685 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1686 if (!buf) {
1687 stats->tx_dropped++;
1688 dev_kfree_skb(skb);
1689 goto freeurb;
1690 }
1691
1692 msg = buf;
1693 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1694 msg->u.tx_can.channel = priv->channel;
1695
1696 switch (dev->family) {
1697 case KVASER_LEAF:
1698 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1699 break;
1700 case KVASER_USBCAN:
1701 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1702 break;
1703 }
1704
1705 *msg_tx_can_flags = 0;
1706
1707 if (cf->can_id & CAN_EFF_FLAG) {
1708 msg->id = CMD_TX_EXT_MESSAGE;
1709 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1710 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1711 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1712 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1713 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1714 } else {
1715 msg->id = CMD_TX_STD_MESSAGE;
1716 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1717 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1718 }
1719
1720 msg->u.tx_can.msg[5] = cf->can_dlc;
1721 memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1722
1723 if (cf->can_id & CAN_RTR_FLAG)
1724 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1725
1726 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1727 for (i = 0; i < dev->max_tx_urbs; i++) {
1728 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
1729 context = &priv->tx_contexts[i];
1730
1731 context->echo_index = i;
1732 can_put_echo_skb(skb, netdev, context->echo_index);
1733 ++priv->active_tx_contexts;
1734 if (priv->active_tx_contexts >= dev->max_tx_urbs)
1735 netif_stop_queue(netdev);
1736
1737 break;
1738 }
1739 }
1740 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1741
1742 /* This should never happen; it implies a flow control bug */
1743 if (!context) {
1744 netdev_warn(netdev, "cannot find free context\n");
1745
1746 kfree(buf);
1747 ret = NETDEV_TX_BUSY;
1748 goto freeurb;
1749 }
1750
1751 context->priv = priv;
1752 context->dlc = cf->can_dlc;
1753
1754 msg->u.tx_can.tid = context->echo_index;
1755
1756 usb_fill_bulk_urb(urb, dev->udev,
1757 usb_sndbulkpipe(dev->udev,
1758 dev->bulk_out->bEndpointAddress),
1759 buf, msg->len,
1760 kvaser_usb_write_bulk_callback, context);
1761 usb_anchor_urb(urb, &priv->tx_submitted);
1762
1763 err = usb_submit_urb(urb, GFP_ATOMIC);
1764 if (unlikely(err)) {
1765 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1766
1767 can_free_echo_skb(netdev, context->echo_index);
1768 context->echo_index = dev->max_tx_urbs;
1769 --priv->active_tx_contexts;
1770 netif_wake_queue(netdev);
1771
1772 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1773
1774 usb_unanchor_urb(urb);
1775 kfree(buf);
1776
1777 stats->tx_dropped++;
1778
1779 if (err == -ENODEV)
1780 netif_device_detach(netdev);
1781 else
1782 netdev_warn(netdev, "Failed tx_urb %d\n", err);
1783
1784 goto freeurb;
1785 }
1786
1787 ret = NETDEV_TX_OK;
1788
1789 freeurb:
1790 usb_free_urb(urb);
1791 return ret;
1792 }
1793
1794 static const struct net_device_ops kvaser_usb_netdev_ops = {
1795 .ndo_open = kvaser_usb_open,
1796 .ndo_stop = kvaser_usb_close,
1797 .ndo_start_xmit = kvaser_usb_start_xmit,
1798 .ndo_change_mtu = can_change_mtu,
1799 };
1800
1801 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1802 .name = "kvaser_usb",
1803 .tseg1_min = KVASER_USB_TSEG1_MIN,
1804 .tseg1_max = KVASER_USB_TSEG1_MAX,
1805 .tseg2_min = KVASER_USB_TSEG2_MIN,
1806 .tseg2_max = KVASER_USB_TSEG2_MAX,
1807 .sjw_max = KVASER_USB_SJW_MAX,
1808 .brp_min = KVASER_USB_BRP_MIN,
1809 .brp_max = KVASER_USB_BRP_MAX,
1810 .brp_inc = KVASER_USB_BRP_INC,
1811 };
1812
1813 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1814 {
1815 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1816 struct can_bittiming *bt = &priv->can.bittiming;
1817 struct kvaser_usb *dev = priv->dev;
1818 struct kvaser_msg *msg;
1819 int rc;
1820
1821 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1822 if (!msg)
1823 return -ENOMEM;
1824
1825 msg->id = CMD_SET_BUS_PARAMS;
1826 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1827 msg->u.busparams.channel = priv->channel;
1828 msg->u.busparams.tid = 0xff;
1829 msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1830 msg->u.busparams.sjw = bt->sjw;
1831 msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1832 msg->u.busparams.tseg2 = bt->phase_seg2;
1833
1834 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1835 msg->u.busparams.no_samp = 3;
1836 else
1837 msg->u.busparams.no_samp = 1;
1838
1839 rc = kvaser_usb_send_msg(dev, msg);
1840
1841 kfree(msg);
1842 return rc;
1843 }
1844
1845 static int kvaser_usb_set_mode(struct net_device *netdev,
1846 enum can_mode mode)
1847 {
1848 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1849 int err;
1850
1851 switch (mode) {
1852 case CAN_MODE_START:
1853 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1854 if (err)
1855 return err;
1856 break;
1857 default:
1858 return -EOPNOTSUPP;
1859 }
1860
1861 return 0;
1862 }
1863
1864 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1865 struct can_berr_counter *bec)
1866 {
1867 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1868
1869 *bec = priv->bec;
1870
1871 return 0;
1872 }
1873
1874 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1875 {
1876 int i;
1877
1878 for (i = 0; i < dev->nchannels; i++) {
1879 if (!dev->nets[i])
1880 continue;
1881
1882 unregister_candev(dev->nets[i]->netdev);
1883 }
1884
1885 kvaser_usb_unlink_all_urbs(dev);
1886
1887 for (i = 0; i < dev->nchannels; i++) {
1888 if (!dev->nets[i])
1889 continue;
1890
1891 free_candev(dev->nets[i]->netdev);
1892 }
1893 }
1894
1895 static int kvaser_usb_init_one(struct usb_interface *intf,
1896 const struct usb_device_id *id, int channel)
1897 {
1898 struct kvaser_usb *dev = usb_get_intfdata(intf);
1899 struct net_device *netdev;
1900 struct kvaser_usb_net_priv *priv;
1901 int err;
1902
1903 err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1904 if (err)
1905 return err;
1906
1907 netdev = alloc_candev(sizeof(*priv) +
1908 dev->max_tx_urbs * sizeof(*priv->tx_contexts),
1909 dev->max_tx_urbs);
1910 if (!netdev) {
1911 dev_err(&intf->dev, "Cannot alloc candev\n");
1912 return -ENOMEM;
1913 }
1914
1915 priv = netdev_priv(netdev);
1916
1917 init_usb_anchor(&priv->tx_submitted);
1918 init_completion(&priv->start_comp);
1919 init_completion(&priv->stop_comp);
1920
1921 priv->dev = dev;
1922 priv->netdev = netdev;
1923 priv->channel = channel;
1924
1925 spin_lock_init(&priv->tx_contexts_lock);
1926 kvaser_usb_reset_tx_urb_contexts(priv);
1927
1928 priv->can.state = CAN_STATE_STOPPED;
1929 priv->can.clock.freq = CAN_USB_CLOCK;
1930 priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1931 priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1932 priv->can.do_set_mode = kvaser_usb_set_mode;
1933 if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1934 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1935 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1936 if (id->driver_info & KVASER_HAS_SILENT_MODE)
1937 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1938
1939 netdev->flags |= IFF_ECHO;
1940
1941 netdev->netdev_ops = &kvaser_usb_netdev_ops;
1942
1943 SET_NETDEV_DEV(netdev, &intf->dev);
1944 netdev->dev_id = channel;
1945
1946 dev->nets[channel] = priv;
1947
1948 err = register_candev(netdev);
1949 if (err) {
1950 dev_err(&intf->dev, "Failed to register can device\n");
1951 free_candev(netdev);
1952 dev->nets[channel] = NULL;
1953 return err;
1954 }
1955
1956 netdev_dbg(netdev, "device registered\n");
1957
1958 return 0;
1959 }
1960
1961 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1962 struct usb_endpoint_descriptor **in,
1963 struct usb_endpoint_descriptor **out)
1964 {
1965 const struct usb_host_interface *iface_desc;
1966 struct usb_endpoint_descriptor *endpoint;
1967 int i;
1968
1969 iface_desc = &intf->altsetting[0];
1970
1971 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1972 endpoint = &iface_desc->endpoint[i].desc;
1973
1974 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1975 *in = endpoint;
1976
1977 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1978 *out = endpoint;
1979
1980 /* use first bulk endpoint for in and out */
1981 if (*in && *out)
1982 return 0;
1983 }
1984
1985 return -ENODEV;
1986 }
1987
1988 static int kvaser_usb_probe(struct usb_interface *intf,
1989 const struct usb_device_id *id)
1990 {
1991 struct kvaser_usb *dev;
1992 int err = -ENOMEM;
1993 int i, retry = 3;
1994
1995 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1996 if (!dev)
1997 return -ENOMEM;
1998
1999 if (kvaser_is_leaf(id)) {
2000 dev->family = KVASER_LEAF;
2001 } else if (kvaser_is_usbcan(id)) {
2002 dev->family = KVASER_USBCAN;
2003 } else {
2004 dev_err(&intf->dev,
2005 "Product ID (%d) does not belong to any known Kvaser USB family",
2006 id->idProduct);
2007 return -ENODEV;
2008 }
2009
2010 err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
2011 if (err) {
2012 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
2013 return err;
2014 }
2015
2016 dev->udev = interface_to_usbdev(intf);
2017
2018 init_usb_anchor(&dev->rx_submitted);
2019
2020 usb_set_intfdata(intf, dev);
2021
2022 /* On some x86 laptops, plugging a Kvaser device again after
2023 * an unplug makes the firmware always ignore the very first
2024 * command. For such a case, provide some room for retries
2025 * instead of completely exiting the driver.
2026 */
2027 do {
2028 err = kvaser_usb_get_software_info(dev);
2029 } while (--retry && err == -ETIMEDOUT);
2030
2031 if (err) {
2032 dev_err(&intf->dev,
2033 "Cannot get software infos, error %d\n", err);
2034 return err;
2035 }
2036
2037 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2038 ((dev->fw_version >> 24) & 0xff),
2039 ((dev->fw_version >> 16) & 0xff),
2040 (dev->fw_version & 0xffff));
2041
2042 dev_dbg(&intf->dev, "Max outstanding tx = %d URBs\n", dev->max_tx_urbs);
2043
2044 err = kvaser_usb_get_card_info(dev);
2045 if (err) {
2046 dev_err(&intf->dev,
2047 "Cannot get card infos, error %d\n", err);
2048 return err;
2049 }
2050
2051 for (i = 0; i < dev->nchannels; i++) {
2052 err = kvaser_usb_init_one(intf, id, i);
2053 if (err) {
2054 kvaser_usb_remove_interfaces(dev);
2055 return err;
2056 }
2057 }
2058
2059 return 0;
2060 }
2061
2062 static void kvaser_usb_disconnect(struct usb_interface *intf)
2063 {
2064 struct kvaser_usb *dev = usb_get_intfdata(intf);
2065
2066 usb_set_intfdata(intf, NULL);
2067
2068 if (!dev)
2069 return;
2070
2071 kvaser_usb_remove_interfaces(dev);
2072 }
2073
2074 static struct usb_driver kvaser_usb_driver = {
2075 .name = "kvaser_usb",
2076 .probe = kvaser_usb_probe,
2077 .disconnect = kvaser_usb_disconnect,
2078 .id_table = kvaser_usb_table,
2079 };
2080
2081 module_usb_driver(kvaser_usb_driver);
2082
2083 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2084 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2085 MODULE_LICENSE("GPL v2");
CRIS linux kernel tree