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Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / drivers / net / can / usb / kvaser_usb.c
blob6f1f3b675ff553a96d4342b619e34a606fa9be29
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
141 #define CMD_LEAF_USB_THROTTLE 77
142 #define CMD_LEAF_LOG_MESSAGE 106
143
144 /* error factors */
145 #define M16C_EF_ACKE BIT(0)
146 #define M16C_EF_CRCE BIT(1)
147 #define M16C_EF_FORME BIT(2)
148 #define M16C_EF_STFE BIT(3)
149 #define M16C_EF_BITE0 BIT(4)
150 #define M16C_EF_BITE1 BIT(5)
151 #define M16C_EF_RCVE BIT(6)
152 #define M16C_EF_TRE BIT(7)
153
154 /* Only Leaf-based devices can report M16C error factors,
155 * thus define our own error status flags for USBCANII
156 */
157 #define USBCAN_ERROR_STATE_NONE 0
158 #define USBCAN_ERROR_STATE_TX_ERROR BIT(0)
159 #define USBCAN_ERROR_STATE_RX_ERROR BIT(1)
160 #define USBCAN_ERROR_STATE_BUSERROR BIT(2)
161
162 /* bittiming parameters */
163 #define KVASER_USB_TSEG1_MIN 1
164 #define KVASER_USB_TSEG1_MAX 16
165 #define KVASER_USB_TSEG2_MIN 1
166 #define KVASER_USB_TSEG2_MAX 8
167 #define KVASER_USB_SJW_MAX 4
168 #define KVASER_USB_BRP_MIN 1
169 #define KVASER_USB_BRP_MAX 64
170 #define KVASER_USB_BRP_INC 1
171
172 /* ctrl modes */
173 #define KVASER_CTRL_MODE_NORMAL 1
174 #define KVASER_CTRL_MODE_SILENT 2
175 #define KVASER_CTRL_MODE_SELFRECEPTION 3
176 #define KVASER_CTRL_MODE_OFF 4
177
178 /* Extended CAN identifier flag */
179 #define KVASER_EXTENDED_FRAME BIT(31)
180
181 /* Kvaser USB CAN dongles are divided into two major families:
182 * - Leaf: Based on Renesas M32C, running firmware labeled as 'filo'
183 * - UsbcanII: Based on Renesas M16C, running firmware labeled as 'helios'
184 */
185 enum kvaser_usb_family {
186 KVASER_LEAF,
187 KVASER_USBCAN,
188 };
189
190 struct kvaser_msg_simple {
191 u8 tid;
192 u8 channel;
193 } __packed;
194
195 struct kvaser_msg_cardinfo {
196 u8 tid;
197 u8 nchannels;
198 union {
199 struct {
200 __le32 serial_number;
201 __le32 padding;
202 } __packed leaf0;
203 struct {
204 __le32 serial_number_low;
205 __le32 serial_number_high;
206 } __packed usbcan0;
207 } __packed;
208 __le32 clock_resolution;
209 __le32 mfgdate;
210 u8 ean[8];
211 u8 hw_revision;
212 union {
213 struct {
214 u8 usb_hs_mode;
215 } __packed leaf1;
216 struct {
217 u8 padding;
218 } __packed usbcan1;
219 } __packed;
220 __le16 padding;
221 } __packed;
222
223 struct kvaser_msg_cardinfo2 {
224 u8 tid;
225 u8 reserved;
226 u8 pcb_id[24];
227 __le32 oem_unlock_code;
228 } __packed;
229
230 struct leaf_msg_softinfo {
231 u8 tid;
232 u8 padding0;
233 __le32 sw_options;
234 __le32 fw_version;
235 __le16 max_outstanding_tx;
236 __le16 padding1[9];
237 } __packed;
238
239 struct usbcan_msg_softinfo {
240 u8 tid;
241 u8 fw_name[5];
242 __le16 max_outstanding_tx;
243 u8 padding[6];
244 __le32 fw_version;
245 __le16 checksum;
246 __le16 sw_options;
247 } __packed;
248
249 struct kvaser_msg_busparams {
250 u8 tid;
251 u8 channel;
252 __le32 bitrate;
253 u8 tseg1;
254 u8 tseg2;
255 u8 sjw;
256 u8 no_samp;
257 } __packed;
258
259 struct kvaser_msg_tx_can {
260 u8 channel;
261 u8 tid;
262 u8 msg[14];
263 union {
264 struct {
265 u8 padding;
266 u8 flags;
267 } __packed leaf;
268 struct {
269 u8 flags;
270 u8 padding;
271 } __packed usbcan;
272 } __packed;
273 } __packed;
274
275 struct kvaser_msg_rx_can_header {
276 u8 channel;
277 u8 flag;
278 } __packed;
279
280 struct leaf_msg_rx_can {
281 u8 channel;
282 u8 flag;
283
284 __le16 time[3];
285 u8 msg[14];
286 } __packed;
287
288 struct usbcan_msg_rx_can {
289 u8 channel;
290 u8 flag;
291
292 u8 msg[14];
293 __le16 time;
294 } __packed;
295
296 struct leaf_msg_chip_state_event {
297 u8 tid;
298 u8 channel;
299
300 __le16 time[3];
301 u8 tx_errors_count;
302 u8 rx_errors_count;
303
304 u8 status;
305 u8 padding[3];
306 } __packed;
307
308 struct usbcan_msg_chip_state_event {
309 u8 tid;
310 u8 channel;
311
312 u8 tx_errors_count;
313 u8 rx_errors_count;
314 __le16 time;
315
316 u8 status;
317 u8 padding[3];
318 } __packed;
319
320 struct kvaser_msg_tx_acknowledge_header {
321 u8 channel;
322 u8 tid;
323 } __packed;
324
325 struct leaf_msg_tx_acknowledge {
326 u8 channel;
327 u8 tid;
328
329 __le16 time[3];
330 u8 flags;
331 u8 time_offset;
332 } __packed;
333
334 struct usbcan_msg_tx_acknowledge {
335 u8 channel;
336 u8 tid;
337
338 __le16 time;
339 __le16 padding;
340 } __packed;
341
342 struct leaf_msg_error_event {
343 u8 tid;
344 u8 flags;
345 __le16 time[3];
346 u8 channel;
347 u8 padding;
348 u8 tx_errors_count;
349 u8 rx_errors_count;
350 u8 status;
351 u8 error_factor;
352 } __packed;
353
354 struct usbcan_msg_error_event {
355 u8 tid;
356 u8 padding;
357 u8 tx_errors_count_ch0;
358 u8 rx_errors_count_ch0;
359 u8 tx_errors_count_ch1;
360 u8 rx_errors_count_ch1;
361 u8 status_ch0;
362 u8 status_ch1;
363 __le16 time;
364 } __packed;
365
366 struct kvaser_msg_ctrl_mode {
367 u8 tid;
368 u8 channel;
369 u8 ctrl_mode;
370 u8 padding[3];
371 } __packed;
372
373 struct kvaser_msg_flush_queue {
374 u8 tid;
375 u8 channel;
376 u8 flags;
377 u8 padding[3];
378 } __packed;
379
380 struct leaf_msg_log_message {
381 u8 channel;
382 u8 flags;
383 __le16 time[3];
384 u8 dlc;
385 u8 time_offset;
386 __le32 id;
387 u8 data[8];
388 } __packed;
389
390 struct kvaser_msg {
391 u8 len;
392 u8 id;
393 union {
394 struct kvaser_msg_simple simple;
395 struct kvaser_msg_cardinfo cardinfo;
396 struct kvaser_msg_cardinfo2 cardinfo2;
397 struct kvaser_msg_busparams busparams;
398
399 struct kvaser_msg_rx_can_header rx_can_header;
400 struct kvaser_msg_tx_acknowledge_header tx_acknowledge_header;
401
402 union {
403 struct leaf_msg_softinfo softinfo;
404 struct leaf_msg_rx_can rx_can;
405 struct leaf_msg_chip_state_event chip_state_event;
406 struct leaf_msg_tx_acknowledge tx_acknowledge;
407 struct leaf_msg_error_event error_event;
408 struct leaf_msg_log_message log_message;
409 } __packed leaf;
410
411 union {
412 struct usbcan_msg_softinfo softinfo;
413 struct usbcan_msg_rx_can rx_can;
414 struct usbcan_msg_chip_state_event chip_state_event;
415 struct usbcan_msg_tx_acknowledge tx_acknowledge;
416 struct usbcan_msg_error_event error_event;
417 } __packed usbcan;
418
419 struct kvaser_msg_tx_can tx_can;
420 struct kvaser_msg_ctrl_mode ctrl_mode;
421 struct kvaser_msg_flush_queue flush_queue;
422 } u;
423 } __packed;
424
425 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
426 * handling. Some discrepancies between the two families exist:
427 *
428 * - USBCAN firmware does not report M16C "error factors"
429 * - USBCAN controllers has difficulties reporting if the raised error
430 * event is for ch0 or ch1. They leave such arbitration to the OS
431 * driver by letting it compare error counters with previous values
432 * and decide the error event's channel. Thus for USBCAN, the channel
433 * field is only advisory.
434 */
435 struct kvaser_usb_error_summary {
436 u8 channel, status, txerr, rxerr;
437 union {
438 struct {
439 u8 error_factor;
440 } leaf;
441 struct {
442 u8 other_ch_status;
443 u8 error_state;
444 } usbcan;
445 };
446 };
447
448 /* Context for an outstanding, not yet ACKed, transmission */
449 struct kvaser_usb_tx_urb_context {
450 struct kvaser_usb_net_priv *priv;
451 u32 echo_index;
452 int dlc;
453 };
454
455 struct kvaser_usb {
456 struct usb_device *udev;
457 struct kvaser_usb_net_priv *nets[MAX_NET_DEVICES];
458
459 struct usb_endpoint_descriptor *bulk_in, *bulk_out;
460 struct usb_anchor rx_submitted;
461
462 /* @max_tx_urbs: Firmware-reported maximum number of oustanding,
463 * not yet ACKed, transmissions on this device. This value is
464 * also used as a sentinel for marking free tx contexts.
465 */
466 u32 fw_version;
467 unsigned int nchannels;
468 unsigned int max_tx_urbs;
469 enum kvaser_usb_family family;
470
471 bool rxinitdone;
472 void *rxbuf[MAX_RX_URBS];
473 dma_addr_t rxbuf_dma[MAX_RX_URBS];
474 };
475
476 struct kvaser_usb_net_priv {
477 struct can_priv can;
478 struct can_berr_counter bec;
479
480 struct kvaser_usb *dev;
481 struct net_device *netdev;
482 int channel;
483
484 struct completion start_comp, stop_comp;
485 struct usb_anchor tx_submitted;
486
487 spinlock_t tx_contexts_lock;
488 int active_tx_contexts;
489 struct kvaser_usb_tx_urb_context tx_contexts[];
490 };
491
492 static const struct usb_device_id kvaser_usb_table[] = {
493 /* Leaf family IDs */
494 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_DEVEL_PRODUCT_ID) },
495 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_PRODUCT_ID) },
496 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_PRODUCT_ID),
497 .driver_info = KVASER_HAS_TXRX_ERRORS |
498 KVASER_HAS_SILENT_MODE },
499 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_PRODUCT_ID),
500 .driver_info = KVASER_HAS_TXRX_ERRORS |
501 KVASER_HAS_SILENT_MODE },
502 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LS_PRODUCT_ID),
503 .driver_info = KVASER_HAS_TXRX_ERRORS |
504 KVASER_HAS_SILENT_MODE },
505 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_SWC_PRODUCT_ID),
506 .driver_info = KVASER_HAS_TXRX_ERRORS |
507 KVASER_HAS_SILENT_MODE },
508 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_LIN_PRODUCT_ID),
509 .driver_info = KVASER_HAS_TXRX_ERRORS |
510 KVASER_HAS_SILENT_MODE },
511 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_LS_PRODUCT_ID),
512 .driver_info = KVASER_HAS_TXRX_ERRORS |
513 KVASER_HAS_SILENT_MODE },
514 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_SPRO_SWC_PRODUCT_ID),
515 .driver_info = KVASER_HAS_TXRX_ERRORS |
516 KVASER_HAS_SILENT_MODE },
517 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_DEVEL_PRODUCT_ID),
518 .driver_info = KVASER_HAS_TXRX_ERRORS |
519 KVASER_HAS_SILENT_MODE },
520 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSHS_PRODUCT_ID),
521 .driver_info = KVASER_HAS_TXRX_ERRORS |
522 KVASER_HAS_SILENT_MODE },
523 { USB_DEVICE(KVASER_VENDOR_ID, USB_UPRO_HSHS_PRODUCT_ID),
524 .driver_info = KVASER_HAS_TXRX_ERRORS },
525 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_GI_PRODUCT_ID) },
526 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_PRO_OBDII_PRODUCT_ID),
527 .driver_info = KVASER_HAS_TXRX_ERRORS |
528 KVASER_HAS_SILENT_MODE },
529 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMO2_HSLS_PRODUCT_ID),
530 .driver_info = KVASER_HAS_TXRX_ERRORS },
531 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_CH_PRODUCT_ID),
532 .driver_info = KVASER_HAS_TXRX_ERRORS },
533 { USB_DEVICE(KVASER_VENDOR_ID, USB_BLACKBIRD_SPRO_PRODUCT_ID),
534 .driver_info = KVASER_HAS_TXRX_ERRORS },
535 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_MERCURY_PRODUCT_ID),
536 .driver_info = KVASER_HAS_TXRX_ERRORS },
537 { USB_DEVICE(KVASER_VENDOR_ID, USB_OEM_LEAF_PRODUCT_ID),
538 .driver_info = KVASER_HAS_TXRX_ERRORS },
539 { USB_DEVICE(KVASER_VENDOR_ID, USB_CAN_R_PRODUCT_ID),
540 .driver_info = KVASER_HAS_TXRX_ERRORS },
541 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LITE_V2_PRODUCT_ID) },
542 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_HS_PRODUCT_ID) },
543 { USB_DEVICE(KVASER_VENDOR_ID, USB_LEAF_LIGHT_HS_V2_OEM_PRODUCT_ID) },
544 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_LIGHT_2HS_PRODUCT_ID) },
545 { USB_DEVICE(KVASER_VENDOR_ID, USB_MINI_PCIE_2HS_PRODUCT_ID) },
546
547 /* USBCANII family IDs */
548 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN2_PRODUCT_ID),
549 .driver_info = KVASER_HAS_TXRX_ERRORS },
550 { USB_DEVICE(KVASER_VENDOR_ID, USB_USBCAN_REVB_PRODUCT_ID),
551 .driver_info = KVASER_HAS_TXRX_ERRORS },
552 { USB_DEVICE(KVASER_VENDOR_ID, USB_MEMORATOR_PRODUCT_ID),
553 .driver_info = KVASER_HAS_TXRX_ERRORS },
554 { USB_DEVICE(KVASER_VENDOR_ID, USB_VCI2_PRODUCT_ID),
555 .driver_info = KVASER_HAS_TXRX_ERRORS },
556
557 { }
558 };
559 MODULE_DEVICE_TABLE(usb, kvaser_usb_table);
560
561 static inline int kvaser_usb_send_msg(const struct kvaser_usb *dev,
562 struct kvaser_msg *msg)
563 {
564 int actual_len;
565
566 return usb_bulk_msg(dev->udev,
567 usb_sndbulkpipe(dev->udev,
568 dev->bulk_out->bEndpointAddress),
569 msg, msg->len, &actual_len,
570 USB_SEND_TIMEOUT);
571 }
572
573 static int kvaser_usb_wait_msg(const struct kvaser_usb *dev, u8 id,
574 struct kvaser_msg *msg)
575 {
576 struct kvaser_msg *tmp;
577 void *buf;
578 int actual_len;
579 int err;
580 int pos;
581 unsigned long to = jiffies + msecs_to_jiffies(USB_RECV_TIMEOUT);
582
583 buf = kzalloc(RX_BUFFER_SIZE, GFP_KERNEL);
584 if (!buf)
585 return -ENOMEM;
586
587 do {
588 err = usb_bulk_msg(dev->udev,
589 usb_rcvbulkpipe(dev->udev,
590 dev->bulk_in->bEndpointAddress),
591 buf, RX_BUFFER_SIZE, &actual_len,
592 USB_RECV_TIMEOUT);
593 if (err < 0)
594 goto end;
595
596 pos = 0;
597 while (pos <= actual_len - MSG_HEADER_LEN) {
598 tmp = buf + pos;
599
600 /* Handle messages crossing the USB endpoint max packet
601 * size boundary. Check kvaser_usb_read_bulk_callback()
602 * for further details.
603 */
604 if (tmp->len == 0) {
605 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
606 wMaxPacketSize));
607 continue;
608 }
609
610 if (pos + tmp->len > actual_len) {
611 dev_err(dev->udev->dev.parent,
612 "Format error\n");
613 break;
614 }
615
616 if (tmp->id == id) {
617 memcpy(msg, tmp, tmp->len);
618 goto end;
619 }
620
621 pos += tmp->len;
622 }
623 } while (time_before(jiffies, to));
624
625 err = -EINVAL;
626
627 end:
628 kfree(buf);
629
630 return err;
631 }
632
633 static int kvaser_usb_send_simple_msg(const struct kvaser_usb *dev,
634 u8 msg_id, int channel)
635 {
636 struct kvaser_msg *msg;
637 int rc;
638
639 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
640 if (!msg)
641 return -ENOMEM;
642
643 msg->id = msg_id;
644 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
645 msg->u.simple.channel = channel;
646 msg->u.simple.tid = 0xff;
647
648 rc = kvaser_usb_send_msg(dev, msg);
649
650 kfree(msg);
651 return rc;
652 }
653
654 static int kvaser_usb_get_software_info(struct kvaser_usb *dev)
655 {
656 struct kvaser_msg msg;
657 int err;
658
659 err = kvaser_usb_send_simple_msg(dev, CMD_GET_SOFTWARE_INFO, 0);
660 if (err)
661 return err;
662
663 err = kvaser_usb_wait_msg(dev, CMD_GET_SOFTWARE_INFO_REPLY, &msg);
664 if (err)
665 return err;
666
667 switch (dev->family) {
668 case KVASER_LEAF:
669 dev->fw_version = le32_to_cpu(msg.u.leaf.softinfo.fw_version);
670 dev->max_tx_urbs =
671 le16_to_cpu(msg.u.leaf.softinfo.max_outstanding_tx);
672 break;
673 case KVASER_USBCAN:
674 dev->fw_version = le32_to_cpu(msg.u.usbcan.softinfo.fw_version);
675 dev->max_tx_urbs =
676 le16_to_cpu(msg.u.usbcan.softinfo.max_outstanding_tx);
677 break;
678 }
679
680 return 0;
681 }
682
683 static int kvaser_usb_get_card_info(struct kvaser_usb *dev)
684 {
685 struct kvaser_msg msg;
686 int err;
687
688 err = kvaser_usb_send_simple_msg(dev, CMD_GET_CARD_INFO, 0);
689 if (err)
690 return err;
691
692 err = kvaser_usb_wait_msg(dev, CMD_GET_CARD_INFO_REPLY, &msg);
693 if (err)
694 return err;
695
696 dev->nchannels = msg.u.cardinfo.nchannels;
697 if ((dev->nchannels > MAX_NET_DEVICES) ||
698 (dev->family == KVASER_USBCAN &&
699 dev->nchannels > MAX_USBCAN_NET_DEVICES))
700 return -EINVAL;
701
702 return 0;
703 }
704
705 static void kvaser_usb_tx_acknowledge(const struct kvaser_usb *dev,
706 const struct kvaser_msg *msg)
707 {
708 struct net_device_stats *stats;
709 struct kvaser_usb_tx_urb_context *context;
710 struct kvaser_usb_net_priv *priv;
711 struct sk_buff *skb;
712 struct can_frame *cf;
713 unsigned long flags;
714 u8 channel, tid;
715
716 channel = msg->u.tx_acknowledge_header.channel;
717 tid = msg->u.tx_acknowledge_header.tid;
718
719 if (channel >= dev->nchannels) {
720 dev_err(dev->udev->dev.parent,
721 "Invalid channel number (%d)\n", channel);
722 return;
723 }
724
725 priv = dev->nets[channel];
726
727 if (!netif_device_present(priv->netdev))
728 return;
729
730 stats = &priv->netdev->stats;
731
732 context = &priv->tx_contexts[tid % dev->max_tx_urbs];
733
734 /* Sometimes the state change doesn't come after a bus-off event */
735 if (priv->can.restart_ms &&
736 (priv->can.state >= CAN_STATE_BUS_OFF)) {
737 skb = alloc_can_err_skb(priv->netdev, &cf);
738 if (skb) {
739 cf->can_id |= CAN_ERR_RESTARTED;
740
741 stats->rx_packets++;
742 stats->rx_bytes += cf->can_dlc;
743 netif_rx(skb);
744 } else {
745 netdev_err(priv->netdev,
746 "No memory left for err_skb\n");
747 }
748
749 priv->can.can_stats.restarts++;
750 netif_carrier_on(priv->netdev);
751
752 priv->can.state = CAN_STATE_ERROR_ACTIVE;
753 }
754
755 stats->tx_packets++;
756 stats->tx_bytes += context->dlc;
757
758 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
759
760 can_get_echo_skb(priv->netdev, context->echo_index);
761 context->echo_index = dev->max_tx_urbs;
762 --priv->active_tx_contexts;
763 netif_wake_queue(priv->netdev);
764
765 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
766 }
767
768 static void kvaser_usb_simple_msg_callback(struct urb *urb)
769 {
770 struct net_device *netdev = urb->context;
771
772 kfree(urb->transfer_buffer);
773
774 if (urb->status)
775 netdev_warn(netdev, "urb status received: %d\n",
776 urb->status);
777 }
778
779 static int kvaser_usb_simple_msg_async(struct kvaser_usb_net_priv *priv,
780 u8 msg_id)
781 {
782 struct kvaser_usb *dev = priv->dev;
783 struct net_device *netdev = priv->netdev;
784 struct kvaser_msg *msg;
785 struct urb *urb;
786 void *buf;
787 int err;
788
789 urb = usb_alloc_urb(0, GFP_ATOMIC);
790 if (!urb) {
791 netdev_err(netdev, "No memory left for URBs\n");
792 return -ENOMEM;
793 }
794
795 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
796 if (!buf) {
797 usb_free_urb(urb);
798 return -ENOMEM;
799 }
800
801 msg = (struct kvaser_msg *)buf;
802 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
803 msg->id = msg_id;
804 msg->u.simple.channel = priv->channel;
805
806 usb_fill_bulk_urb(urb, dev->udev,
807 usb_sndbulkpipe(dev->udev,
808 dev->bulk_out->bEndpointAddress),
809 buf, msg->len,
810 kvaser_usb_simple_msg_callback, netdev);
811 usb_anchor_urb(urb, &priv->tx_submitted);
812
813 err = usb_submit_urb(urb, GFP_ATOMIC);
814 if (err) {
815 netdev_err(netdev, "Error transmitting URB\n");
816 usb_unanchor_urb(urb);
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 default:
1307 warn: dev_warn(dev->udev->dev.parent,
1308 "Unhandled message (%d)\n", msg->id);
1309 break;
1310 }
1311 }
1312
1313 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1314 {
1315 struct kvaser_usb *dev = urb->context;
1316 struct kvaser_msg *msg;
1317 int pos = 0;
1318 int err, i;
1319
1320 switch (urb->status) {
1321 case 0:
1322 break;
1323 case -ENOENT:
1324 case -ESHUTDOWN:
1325 return;
1326 default:
1327 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1328 urb->status);
1329 goto resubmit_urb;
1330 }
1331
1332 while (pos <= urb->actual_length - MSG_HEADER_LEN) {
1333 msg = urb->transfer_buffer + pos;
1334
1335 /* The Kvaser firmware can only read and write messages that
1336 * does not cross the USB's endpoint wMaxPacketSize boundary.
1337 * If a follow-up command crosses such boundary, firmware puts
1338 * a placeholder zero-length command in its place then aligns
1339 * the real command to the next max packet size.
1340 *
1341 * Handle such cases or we're going to miss a significant
1342 * number of events in case of a heavy rx load on the bus.
1343 */
1344 if (msg->len == 0) {
1345 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
1346 wMaxPacketSize));
1347 continue;
1348 }
1349
1350 if (pos + msg->len > urb->actual_length) {
1351 dev_err(dev->udev->dev.parent, "Format error\n");
1352 break;
1353 }
1354
1355 kvaser_usb_handle_message(dev, msg);
1356 pos += msg->len;
1357 }
1358
1359 resubmit_urb:
1360 usb_fill_bulk_urb(urb, dev->udev,
1361 usb_rcvbulkpipe(dev->udev,
1362 dev->bulk_in->bEndpointAddress),
1363 urb->transfer_buffer, RX_BUFFER_SIZE,
1364 kvaser_usb_read_bulk_callback, dev);
1365
1366 err = usb_submit_urb(urb, GFP_ATOMIC);
1367 if (err == -ENODEV) {
1368 for (i = 0; i < dev->nchannels; i++) {
1369 if (!dev->nets[i])
1370 continue;
1371
1372 netif_device_detach(dev->nets[i]->netdev);
1373 }
1374 } else if (err) {
1375 dev_err(dev->udev->dev.parent,
1376 "Failed resubmitting read bulk urb: %d\n", err);
1377 }
1378
1379 return;
1380 }
1381
1382 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1383 {
1384 int i, err = 0;
1385
1386 if (dev->rxinitdone)
1387 return 0;
1388
1389 for (i = 0; i < MAX_RX_URBS; i++) {
1390 struct urb *urb = NULL;
1391 u8 *buf = NULL;
1392 dma_addr_t buf_dma;
1393
1394 urb = usb_alloc_urb(0, GFP_KERNEL);
1395 if (!urb) {
1396 dev_warn(dev->udev->dev.parent,
1397 "No memory left for URBs\n");
1398 err = -ENOMEM;
1399 break;
1400 }
1401
1402 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1403 GFP_KERNEL, &buf_dma);
1404 if (!buf) {
1405 dev_warn(dev->udev->dev.parent,
1406 "No memory left for USB buffer\n");
1407 usb_free_urb(urb);
1408 err = -ENOMEM;
1409 break;
1410 }
1411
1412 usb_fill_bulk_urb(urb, dev->udev,
1413 usb_rcvbulkpipe(dev->udev,
1414 dev->bulk_in->bEndpointAddress),
1415 buf, RX_BUFFER_SIZE,
1416 kvaser_usb_read_bulk_callback,
1417 dev);
1418 urb->transfer_dma = buf_dma;
1419 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1420 usb_anchor_urb(urb, &dev->rx_submitted);
1421
1422 err = usb_submit_urb(urb, GFP_KERNEL);
1423 if (err) {
1424 usb_unanchor_urb(urb);
1425 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1426 buf_dma);
1427 usb_free_urb(urb);
1428 break;
1429 }
1430
1431 dev->rxbuf[i] = buf;
1432 dev->rxbuf_dma[i] = buf_dma;
1433
1434 usb_free_urb(urb);
1435 }
1436
1437 if (i == 0) {
1438 dev_warn(dev->udev->dev.parent,
1439 "Cannot setup read URBs, error %d\n", err);
1440 return err;
1441 } else if (i < MAX_RX_URBS) {
1442 dev_warn(dev->udev->dev.parent,
1443 "RX performances may be slow\n");
1444 }
1445
1446 dev->rxinitdone = true;
1447
1448 return 0;
1449 }
1450
1451 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1452 {
1453 struct kvaser_msg *msg;
1454 int rc;
1455
1456 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1457 if (!msg)
1458 return -ENOMEM;
1459
1460 msg->id = CMD_SET_CTRL_MODE;
1461 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1462 msg->u.ctrl_mode.tid = 0xff;
1463 msg->u.ctrl_mode.channel = priv->channel;
1464
1465 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1466 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1467 else
1468 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1469
1470 rc = kvaser_usb_send_msg(priv->dev, msg);
1471
1472 kfree(msg);
1473 return rc;
1474 }
1475
1476 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1477 {
1478 int err;
1479
1480 init_completion(&priv->start_comp);
1481
1482 err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1483 priv->channel);
1484 if (err)
1485 return err;
1486
1487 if (!wait_for_completion_timeout(&priv->start_comp,
1488 msecs_to_jiffies(START_TIMEOUT)))
1489 return -ETIMEDOUT;
1490
1491 return 0;
1492 }
1493
1494 static int kvaser_usb_open(struct net_device *netdev)
1495 {
1496 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1497 struct kvaser_usb *dev = priv->dev;
1498 int err;
1499
1500 err = open_candev(netdev);
1501 if (err)
1502 return err;
1503
1504 err = kvaser_usb_setup_rx_urbs(dev);
1505 if (err)
1506 goto error;
1507
1508 err = kvaser_usb_set_opt_mode(priv);
1509 if (err)
1510 goto error;
1511
1512 err = kvaser_usb_start_chip(priv);
1513 if (err) {
1514 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1515 goto error;
1516 }
1517
1518 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1519
1520 return 0;
1521
1522 error:
1523 close_candev(netdev);
1524 return err;
1525 }
1526
1527 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1528 {
1529 int i, max_tx_urbs;
1530
1531 max_tx_urbs = priv->dev->max_tx_urbs;
1532
1533 priv->active_tx_contexts = 0;
1534 for (i = 0; i < max_tx_urbs; i++)
1535 priv->tx_contexts[i].echo_index = max_tx_urbs;
1536 }
1537
1538 /* This method might sleep. Do not call it in the atomic context
1539 * of URB completions.
1540 */
1541 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1542 {
1543 usb_kill_anchored_urbs(&priv->tx_submitted);
1544 kvaser_usb_reset_tx_urb_contexts(priv);
1545 }
1546
1547 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1548 {
1549 int i;
1550
1551 usb_kill_anchored_urbs(&dev->rx_submitted);
1552
1553 for (i = 0; i < MAX_RX_URBS; i++)
1554 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1555 dev->rxbuf[i],
1556 dev->rxbuf_dma[i]);
1557
1558 for (i = 0; i < dev->nchannels; i++) {
1559 struct kvaser_usb_net_priv *priv = dev->nets[i];
1560
1561 if (priv)
1562 kvaser_usb_unlink_tx_urbs(priv);
1563 }
1564 }
1565
1566 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1567 {
1568 int err;
1569
1570 init_completion(&priv->stop_comp);
1571
1572 err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1573 priv->channel);
1574 if (err)
1575 return err;
1576
1577 if (!wait_for_completion_timeout(&priv->stop_comp,
1578 msecs_to_jiffies(STOP_TIMEOUT)))
1579 return -ETIMEDOUT;
1580
1581 return 0;
1582 }
1583
1584 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1585 {
1586 struct kvaser_msg *msg;
1587 int rc;
1588
1589 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1590 if (!msg)
1591 return -ENOMEM;
1592
1593 msg->id = CMD_FLUSH_QUEUE;
1594 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1595 msg->u.flush_queue.channel = priv->channel;
1596 msg->u.flush_queue.flags = 0x00;
1597
1598 rc = kvaser_usb_send_msg(priv->dev, msg);
1599
1600 kfree(msg);
1601 return rc;
1602 }
1603
1604 static int kvaser_usb_close(struct net_device *netdev)
1605 {
1606 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1607 struct kvaser_usb *dev = priv->dev;
1608 int err;
1609
1610 netif_stop_queue(netdev);
1611
1612 err = kvaser_usb_flush_queue(priv);
1613 if (err)
1614 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1615
1616 if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1617 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1618
1619 err = kvaser_usb_stop_chip(priv);
1620 if (err)
1621 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1622
1623 /* reset tx contexts */
1624 kvaser_usb_unlink_tx_urbs(priv);
1625
1626 priv->can.state = CAN_STATE_STOPPED;
1627 close_candev(priv->netdev);
1628
1629 return 0;
1630 }
1631
1632 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1633 {
1634 struct kvaser_usb_tx_urb_context *context = urb->context;
1635 struct kvaser_usb_net_priv *priv;
1636 struct net_device *netdev;
1637
1638 if (WARN_ON(!context))
1639 return;
1640
1641 priv = context->priv;
1642 netdev = priv->netdev;
1643
1644 kfree(urb->transfer_buffer);
1645
1646 if (!netif_device_present(netdev))
1647 return;
1648
1649 if (urb->status)
1650 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1651 }
1652
1653 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1654 struct net_device *netdev)
1655 {
1656 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1657 struct kvaser_usb *dev = priv->dev;
1658 struct net_device_stats *stats = &netdev->stats;
1659 struct can_frame *cf = (struct can_frame *)skb->data;
1660 struct kvaser_usb_tx_urb_context *context = NULL;
1661 struct urb *urb;
1662 void *buf;
1663 struct kvaser_msg *msg;
1664 int i, err, ret = NETDEV_TX_OK;
1665 u8 *msg_tx_can_flags = NULL; /* GCC */
1666 unsigned long flags;
1667
1668 if (can_dropped_invalid_skb(netdev, skb))
1669 return NETDEV_TX_OK;
1670
1671 urb = usb_alloc_urb(0, GFP_ATOMIC);
1672 if (!urb) {
1673 netdev_err(netdev, "No memory left for URBs\n");
1674 stats->tx_dropped++;
1675 dev_kfree_skb(skb);
1676 return NETDEV_TX_OK;
1677 }
1678
1679 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1680 if (!buf) {
1681 stats->tx_dropped++;
1682 dev_kfree_skb(skb);
1683 goto freeurb;
1684 }
1685
1686 msg = buf;
1687 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1688 msg->u.tx_can.channel = priv->channel;
1689
1690 switch (dev->family) {
1691 case KVASER_LEAF:
1692 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1693 break;
1694 case KVASER_USBCAN:
1695 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1696 break;
1697 }
1698
1699 *msg_tx_can_flags = 0;
1700
1701 if (cf->can_id & CAN_EFF_FLAG) {
1702 msg->id = CMD_TX_EXT_MESSAGE;
1703 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1704 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1705 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1706 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1707 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1708 } else {
1709 msg->id = CMD_TX_STD_MESSAGE;
1710 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1711 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1712 }
1713
1714 msg->u.tx_can.msg[5] = cf->can_dlc;
1715 memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1716
1717 if (cf->can_id & CAN_RTR_FLAG)
1718 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1719
1720 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1721 for (i = 0; i < dev->max_tx_urbs; i++) {
1722 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
1723 context = &priv->tx_contexts[i];
1724
1725 context->echo_index = i;
1726 can_put_echo_skb(skb, netdev, context->echo_index);
1727 ++priv->active_tx_contexts;
1728 if (priv->active_tx_contexts >= dev->max_tx_urbs)
1729 netif_stop_queue(netdev);
1730
1731 break;
1732 }
1733 }
1734 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1735
1736 /* This should never happen; it implies a flow control bug */
1737 if (!context) {
1738 netdev_warn(netdev, "cannot find free context\n");
1739
1740 kfree(buf);
1741 ret = NETDEV_TX_BUSY;
1742 goto freeurb;
1743 }
1744
1745 context->priv = priv;
1746 context->dlc = cf->can_dlc;
1747
1748 msg->u.tx_can.tid = context->echo_index;
1749
1750 usb_fill_bulk_urb(urb, dev->udev,
1751 usb_sndbulkpipe(dev->udev,
1752 dev->bulk_out->bEndpointAddress),
1753 buf, msg->len,
1754 kvaser_usb_write_bulk_callback, context);
1755 usb_anchor_urb(urb, &priv->tx_submitted);
1756
1757 err = usb_submit_urb(urb, GFP_ATOMIC);
1758 if (unlikely(err)) {
1759 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1760
1761 can_free_echo_skb(netdev, context->echo_index);
1762 context->echo_index = dev->max_tx_urbs;
1763 --priv->active_tx_contexts;
1764 netif_wake_queue(netdev);
1765
1766 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1767
1768 usb_unanchor_urb(urb);
1769
1770 stats->tx_dropped++;
1771
1772 if (err == -ENODEV)
1773 netif_device_detach(netdev);
1774 else
1775 netdev_warn(netdev, "Failed tx_urb %d\n", err);
1776
1777 goto freeurb;
1778 }
1779
1780 ret = NETDEV_TX_OK;
1781
1782 freeurb:
1783 usb_free_urb(urb);
1784 return ret;
1785 }
1786
1787 static const struct net_device_ops kvaser_usb_netdev_ops = {
1788 .ndo_open = kvaser_usb_open,
1789 .ndo_stop = kvaser_usb_close,
1790 .ndo_start_xmit = kvaser_usb_start_xmit,
1791 .ndo_change_mtu = can_change_mtu,
1792 };
1793
1794 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1795 .name = "kvaser_usb",
1796 .tseg1_min = KVASER_USB_TSEG1_MIN,
1797 .tseg1_max = KVASER_USB_TSEG1_MAX,
1798 .tseg2_min = KVASER_USB_TSEG2_MIN,
1799 .tseg2_max = KVASER_USB_TSEG2_MAX,
1800 .sjw_max = KVASER_USB_SJW_MAX,
1801 .brp_min = KVASER_USB_BRP_MIN,
1802 .brp_max = KVASER_USB_BRP_MAX,
1803 .brp_inc = KVASER_USB_BRP_INC,
1804 };
1805
1806 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1807 {
1808 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1809 struct can_bittiming *bt = &priv->can.bittiming;
1810 struct kvaser_usb *dev = priv->dev;
1811 struct kvaser_msg *msg;
1812 int rc;
1813
1814 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1815 if (!msg)
1816 return -ENOMEM;
1817
1818 msg->id = CMD_SET_BUS_PARAMS;
1819 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1820 msg->u.busparams.channel = priv->channel;
1821 msg->u.busparams.tid = 0xff;
1822 msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1823 msg->u.busparams.sjw = bt->sjw;
1824 msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1825 msg->u.busparams.tseg2 = bt->phase_seg2;
1826
1827 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1828 msg->u.busparams.no_samp = 3;
1829 else
1830 msg->u.busparams.no_samp = 1;
1831
1832 rc = kvaser_usb_send_msg(dev, msg);
1833
1834 kfree(msg);
1835 return rc;
1836 }
1837
1838 static int kvaser_usb_set_mode(struct net_device *netdev,
1839 enum can_mode mode)
1840 {
1841 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1842 int err;
1843
1844 switch (mode) {
1845 case CAN_MODE_START:
1846 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1847 if (err)
1848 return err;
1849 break;
1850 default:
1851 return -EOPNOTSUPP;
1852 }
1853
1854 return 0;
1855 }
1856
1857 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1858 struct can_berr_counter *bec)
1859 {
1860 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1861
1862 *bec = priv->bec;
1863
1864 return 0;
1865 }
1866
1867 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1868 {
1869 int i;
1870
1871 for (i = 0; i < dev->nchannels; i++) {
1872 if (!dev->nets[i])
1873 continue;
1874
1875 unregister_candev(dev->nets[i]->netdev);
1876 }
1877
1878 kvaser_usb_unlink_all_urbs(dev);
1879
1880 for (i = 0; i < dev->nchannels; i++) {
1881 if (!dev->nets[i])
1882 continue;
1883
1884 free_candev(dev->nets[i]->netdev);
1885 }
1886 }
1887
1888 static int kvaser_usb_init_one(struct usb_interface *intf,
1889 const struct usb_device_id *id, int channel)
1890 {
1891 struct kvaser_usb *dev = usb_get_intfdata(intf);
1892 struct net_device *netdev;
1893 struct kvaser_usb_net_priv *priv;
1894 int err;
1895
1896 err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1897 if (err)
1898 return err;
1899
1900 netdev = alloc_candev(sizeof(*priv) +
1901 dev->max_tx_urbs * sizeof(*priv->tx_contexts),
1902 dev->max_tx_urbs);
1903 if (!netdev) {
1904 dev_err(&intf->dev, "Cannot alloc candev\n");
1905 return -ENOMEM;
1906 }
1907
1908 priv = netdev_priv(netdev);
1909
1910 init_usb_anchor(&priv->tx_submitted);
1911 init_completion(&priv->start_comp);
1912 init_completion(&priv->stop_comp);
1913
1914 priv->dev = dev;
1915 priv->netdev = netdev;
1916 priv->channel = channel;
1917
1918 spin_lock_init(&priv->tx_contexts_lock);
1919 kvaser_usb_reset_tx_urb_contexts(priv);
1920
1921 priv->can.state = CAN_STATE_STOPPED;
1922 priv->can.clock.freq = CAN_USB_CLOCK;
1923 priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1924 priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1925 priv->can.do_set_mode = kvaser_usb_set_mode;
1926 if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1927 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1928 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1929 if (id->driver_info & KVASER_HAS_SILENT_MODE)
1930 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1931
1932 netdev->flags |= IFF_ECHO;
1933
1934 netdev->netdev_ops = &kvaser_usb_netdev_ops;
1935
1936 SET_NETDEV_DEV(netdev, &intf->dev);
1937 netdev->dev_id = channel;
1938
1939 dev->nets[channel] = priv;
1940
1941 err = register_candev(netdev);
1942 if (err) {
1943 dev_err(&intf->dev, "Failed to register can device\n");
1944 free_candev(netdev);
1945 dev->nets[channel] = NULL;
1946 return err;
1947 }
1948
1949 netdev_dbg(netdev, "device registered\n");
1950
1951 return 0;
1952 }
1953
1954 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1955 struct usb_endpoint_descriptor **in,
1956 struct usb_endpoint_descriptor **out)
1957 {
1958 const struct usb_host_interface *iface_desc;
1959 struct usb_endpoint_descriptor *endpoint;
1960 int i;
1961
1962 iface_desc = &intf->altsetting[0];
1963
1964 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1965 endpoint = &iface_desc->endpoint[i].desc;
1966
1967 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1968 *in = endpoint;
1969
1970 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1971 *out = endpoint;
1972
1973 /* use first bulk endpoint for in and out */
1974 if (*in && *out)
1975 return 0;
1976 }
1977
1978 return -ENODEV;
1979 }
1980
1981 static int kvaser_usb_probe(struct usb_interface *intf,
1982 const struct usb_device_id *id)
1983 {
1984 struct kvaser_usb *dev;
1985 int err = -ENOMEM;
1986 int i, retry = 3;
1987
1988 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1989 if (!dev)
1990 return -ENOMEM;
1991
1992 if (kvaser_is_leaf(id)) {
1993 dev->family = KVASER_LEAF;
1994 } else if (kvaser_is_usbcan(id)) {
1995 dev->family = KVASER_USBCAN;
1996 } else {
1997 dev_err(&intf->dev,
1998 "Product ID (%d) does not belong to any known Kvaser USB family",
1999 id->idProduct);
2000 return -ENODEV;
2001 }
2002
2003 err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
2004 if (err) {
2005 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
2006 return err;
2007 }
2008
2009 dev->udev = interface_to_usbdev(intf);
2010
2011 init_usb_anchor(&dev->rx_submitted);
2012
2013 usb_set_intfdata(intf, dev);
2014
2015 /* On some x86 laptops, plugging a Kvaser device again after
2016 * an unplug makes the firmware always ignore the very first
2017 * command. For such a case, provide some room for retries
2018 * instead of completely exiting the driver.
2019 */
2020 do {
2021 err = kvaser_usb_get_software_info(dev);
2022 } while (--retry && err == -ETIMEDOUT);
2023
2024 if (err) {
2025 dev_err(&intf->dev,
2026 "Cannot get software infos, error %d\n", err);
2027 return err;
2028 }
2029
2030 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2031 ((dev->fw_version >> 24) & 0xff),
2032 ((dev->fw_version >> 16) & 0xff),
2033 (dev->fw_version & 0xffff));
2034
2035 dev_dbg(&intf->dev, "Max oustanding tx = %d URBs\n", dev->max_tx_urbs);
2036
2037 err = kvaser_usb_get_card_info(dev);
2038 if (err) {
2039 dev_err(&intf->dev,
2040 "Cannot get card infos, error %d\n", err);
2041 return err;
2042 }
2043
2044 for (i = 0; i < dev->nchannels; i++) {
2045 err = kvaser_usb_init_one(intf, id, i);
2046 if (err) {
2047 kvaser_usb_remove_interfaces(dev);
2048 return err;
2049 }
2050 }
2051
2052 return 0;
2053 }
2054
2055 static void kvaser_usb_disconnect(struct usb_interface *intf)
2056 {
2057 struct kvaser_usb *dev = usb_get_intfdata(intf);
2058
2059 usb_set_intfdata(intf, NULL);
2060
2061 if (!dev)
2062 return;
2063
2064 kvaser_usb_remove_interfaces(dev);
2065 }
2066
2067 static struct usb_driver kvaser_usb_driver = {
2068 .name = "kvaser_usb",
2069 .probe = kvaser_usb_probe,
2070 .disconnect = kvaser_usb_disconnect,
2071 .id_table = kvaser_usb_table,
2072 };
2073
2074 module_usb_driver(kvaser_usb_driver);
2075
2076 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2077 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2078 MODULE_LICENSE("GPL v2");
CRIS linux kernel tree