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Merge remote-tracking branch 'omap_dss2/for-next'
[deliverable/linux.git] / drivers / net / can / usb / kvaser_usb.c
1 /*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License as
4 * published by the Free Software Foundation version 2.
5 *
6 * Parts of this driver are based on the following:
7 * - Kvaser linux leaf driver (version 4.78)
8 * - CAN driver for esd CAN-USB/2
9 * - Kvaser linux usbcanII driver (version 5.3)
10 *
11 * Copyright (C) 2002-2006 KVASER AB, Sweden. All rights reserved.
12 * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
13 * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
14 * Copyright (C) 2015 Valeo S.A.
15 */
16
17 #include <linux/spinlock.h>
18 #include <linux/kernel.h>
19 #include <linux/completion.h>
20 #include <linux/module.h>
21 #include <linux/netdevice.h>
22 #include <linux/usb.h>
23
24 #include <linux/can.h>
25 #include <linux/can/dev.h>
26 #include <linux/can/error.h>
27
28 #define MAX_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 return -ENOMEM;
792
793 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
794 if (!buf) {
795 usb_free_urb(urb);
796 return -ENOMEM;
797 }
798
799 msg = (struct kvaser_msg *)buf;
800 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_simple);
801 msg->id = msg_id;
802 msg->u.simple.channel = priv->channel;
803
804 usb_fill_bulk_urb(urb, dev->udev,
805 usb_sndbulkpipe(dev->udev,
806 dev->bulk_out->bEndpointAddress),
807 buf, msg->len,
808 kvaser_usb_simple_msg_callback, netdev);
809 usb_anchor_urb(urb, &priv->tx_submitted);
810
811 err = usb_submit_urb(urb, GFP_ATOMIC);
812 if (err) {
813 netdev_err(netdev, "Error transmitting URB\n");
814 usb_unanchor_urb(urb);
815 usb_free_urb(urb);
816 return err;
817 }
818
819 usb_free_urb(urb);
820
821 return 0;
822 }
823
824 static void kvaser_usb_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
825 const struct kvaser_usb_error_summary *es,
826 struct can_frame *cf)
827 {
828 struct kvaser_usb *dev = priv->dev;
829 struct net_device_stats *stats = &priv->netdev->stats;
830 enum can_state cur_state, new_state, tx_state, rx_state;
831
832 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
833
834 new_state = cur_state = priv->can.state;
835
836 if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET))
837 new_state = CAN_STATE_BUS_OFF;
838 else if (es->status & M16C_STATE_BUS_PASSIVE)
839 new_state = CAN_STATE_ERROR_PASSIVE;
840 else if (es->status & M16C_STATE_BUS_ERROR) {
841 /* Guard against spurious error events after a busoff */
842 if (cur_state < CAN_STATE_BUS_OFF) {
843 if ((es->txerr >= 128) || (es->rxerr >= 128))
844 new_state = CAN_STATE_ERROR_PASSIVE;
845 else if ((es->txerr >= 96) || (es->rxerr >= 96))
846 new_state = CAN_STATE_ERROR_WARNING;
847 else if (cur_state > CAN_STATE_ERROR_ACTIVE)
848 new_state = CAN_STATE_ERROR_ACTIVE;
849 }
850 }
851
852 if (!es->status)
853 new_state = CAN_STATE_ERROR_ACTIVE;
854
855 if (new_state != cur_state) {
856 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
857 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
858
859 can_change_state(priv->netdev, cf, tx_state, rx_state);
860 }
861
862 if (priv->can.restart_ms &&
863 (cur_state >= CAN_STATE_BUS_OFF) &&
864 (new_state < CAN_STATE_BUS_OFF)) {
865 priv->can.can_stats.restarts++;
866 }
867
868 switch (dev->family) {
869 case KVASER_LEAF:
870 if (es->leaf.error_factor) {
871 priv->can.can_stats.bus_error++;
872 stats->rx_errors++;
873 }
874 break;
875 case KVASER_USBCAN:
876 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
877 stats->tx_errors++;
878 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
879 stats->rx_errors++;
880 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
881 priv->can.can_stats.bus_error++;
882 }
883 break;
884 }
885
886 priv->bec.txerr = es->txerr;
887 priv->bec.rxerr = es->rxerr;
888 }
889
890 static void kvaser_usb_rx_error(const struct kvaser_usb *dev,
891 const struct kvaser_usb_error_summary *es)
892 {
893 struct can_frame *cf, tmp_cf = { .can_id = CAN_ERR_FLAG, .can_dlc = CAN_ERR_DLC };
894 struct sk_buff *skb;
895 struct net_device_stats *stats;
896 struct kvaser_usb_net_priv *priv;
897 enum can_state old_state, new_state;
898
899 if (es->channel >= dev->nchannels) {
900 dev_err(dev->udev->dev.parent,
901 "Invalid channel number (%d)\n", es->channel);
902 return;
903 }
904
905 priv = dev->nets[es->channel];
906 stats = &priv->netdev->stats;
907
908 /* Update all of the can interface's state and error counters before
909 * trying any memory allocation that can actually fail with -ENOMEM.
910 *
911 * We send a temporary stack-allocated error can frame to
912 * can_change_state() for the very same reason.
913 *
914 * TODO: Split can_change_state() responsibility between updating the
915 * can interface's state and counters, and the setting up of can error
916 * frame ID and data to userspace. Remove stack allocation afterwards.
917 */
918 old_state = priv->can.state;
919 kvaser_usb_rx_error_update_can_state(priv, es, &tmp_cf);
920 new_state = priv->can.state;
921
922 skb = alloc_can_err_skb(priv->netdev, &cf);
923 if (!skb) {
924 stats->rx_dropped++;
925 return;
926 }
927 memcpy(cf, &tmp_cf, sizeof(*cf));
928
929 if (new_state != old_state) {
930 if (es->status &
931 (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
932 if (!priv->can.restart_ms)
933 kvaser_usb_simple_msg_async(priv, CMD_STOP_CHIP);
934 netif_carrier_off(priv->netdev);
935 }
936
937 if (priv->can.restart_ms &&
938 (old_state >= CAN_STATE_BUS_OFF) &&
939 (new_state < CAN_STATE_BUS_OFF)) {
940 cf->can_id |= CAN_ERR_RESTARTED;
941 netif_carrier_on(priv->netdev);
942 }
943 }
944
945 switch (dev->family) {
946 case KVASER_LEAF:
947 if (es->leaf.error_factor) {
948 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
949
950 if (es->leaf.error_factor & M16C_EF_ACKE)
951 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
952 if (es->leaf.error_factor & M16C_EF_CRCE)
953 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
954 if (es->leaf.error_factor & M16C_EF_FORME)
955 cf->data[2] |= CAN_ERR_PROT_FORM;
956 if (es->leaf.error_factor & M16C_EF_STFE)
957 cf->data[2] |= CAN_ERR_PROT_STUFF;
958 if (es->leaf.error_factor & M16C_EF_BITE0)
959 cf->data[2] |= CAN_ERR_PROT_BIT0;
960 if (es->leaf.error_factor & M16C_EF_BITE1)
961 cf->data[2] |= CAN_ERR_PROT_BIT1;
962 if (es->leaf.error_factor & M16C_EF_TRE)
963 cf->data[2] |= CAN_ERR_PROT_TX;
964 }
965 break;
966 case KVASER_USBCAN:
967 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR) {
968 cf->can_id |= CAN_ERR_BUSERROR;
969 }
970 break;
971 }
972
973 cf->data[6] = es->txerr;
974 cf->data[7] = es->rxerr;
975
976 stats->rx_packets++;
977 stats->rx_bytes += cf->can_dlc;
978 netif_rx(skb);
979 }
980
981 /* For USBCAN, report error to userspace iff the channels's errors counter
982 * has changed, or we're the only channel seeing a bus error state.
983 */
984 static void kvaser_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
985 struct kvaser_usb_error_summary *es)
986 {
987 struct kvaser_usb_net_priv *priv;
988 int channel;
989 bool report_error;
990
991 channel = es->channel;
992 if (channel >= dev->nchannels) {
993 dev_err(dev->udev->dev.parent,
994 "Invalid channel number (%d)\n", channel);
995 return;
996 }
997
998 priv = dev->nets[channel];
999 report_error = false;
1000
1001 if (es->txerr != priv->bec.txerr) {
1002 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
1003 report_error = true;
1004 }
1005 if (es->rxerr != priv->bec.rxerr) {
1006 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
1007 report_error = true;
1008 }
1009 if ((es->status & M16C_STATE_BUS_ERROR) &&
1010 !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
1011 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
1012 report_error = true;
1013 }
1014
1015 if (report_error)
1016 kvaser_usb_rx_error(dev, es);
1017 }
1018
1019 static void kvaser_usbcan_rx_error(const struct kvaser_usb *dev,
1020 const struct kvaser_msg *msg)
1021 {
1022 struct kvaser_usb_error_summary es = { };
1023
1024 switch (msg->id) {
1025 /* Sometimes errors are sent as unsolicited chip state events */
1026 case CMD_CHIP_STATE_EVENT:
1027 es.channel = msg->u.usbcan.chip_state_event.channel;
1028 es.status = msg->u.usbcan.chip_state_event.status;
1029 es.txerr = msg->u.usbcan.chip_state_event.tx_errors_count;
1030 es.rxerr = msg->u.usbcan.chip_state_event.rx_errors_count;
1031 kvaser_usbcan_conditionally_rx_error(dev, &es);
1032 break;
1033
1034 case CMD_CAN_ERROR_EVENT:
1035 es.channel = 0;
1036 es.status = msg->u.usbcan.error_event.status_ch0;
1037 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch0;
1038 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch0;
1039 es.usbcan.other_ch_status =
1040 msg->u.usbcan.error_event.status_ch1;
1041 kvaser_usbcan_conditionally_rx_error(dev, &es);
1042
1043 /* The USBCAN firmware supports up to 2 channels.
1044 * Now that ch0 was checked, check if ch1 has any errors.
1045 */
1046 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1047 es.channel = 1;
1048 es.status = msg->u.usbcan.error_event.status_ch1;
1049 es.txerr = msg->u.usbcan.error_event.tx_errors_count_ch1;
1050 es.rxerr = msg->u.usbcan.error_event.rx_errors_count_ch1;
1051 es.usbcan.other_ch_status =
1052 msg->u.usbcan.error_event.status_ch0;
1053 kvaser_usbcan_conditionally_rx_error(dev, &es);
1054 }
1055 break;
1056
1057 default:
1058 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1059 msg->id);
1060 }
1061 }
1062
1063 static void kvaser_leaf_rx_error(const struct kvaser_usb *dev,
1064 const struct kvaser_msg *msg)
1065 {
1066 struct kvaser_usb_error_summary es = { };
1067
1068 switch (msg->id) {
1069 case CMD_CAN_ERROR_EVENT:
1070 es.channel = msg->u.leaf.error_event.channel;
1071 es.status = msg->u.leaf.error_event.status;
1072 es.txerr = msg->u.leaf.error_event.tx_errors_count;
1073 es.rxerr = msg->u.leaf.error_event.rx_errors_count;
1074 es.leaf.error_factor = msg->u.leaf.error_event.error_factor;
1075 break;
1076 case CMD_LEAF_LOG_MESSAGE:
1077 es.channel = msg->u.leaf.log_message.channel;
1078 es.status = msg->u.leaf.log_message.data[0];
1079 es.txerr = msg->u.leaf.log_message.data[2];
1080 es.rxerr = msg->u.leaf.log_message.data[3];
1081 es.leaf.error_factor = msg->u.leaf.log_message.data[1];
1082 break;
1083 case CMD_CHIP_STATE_EVENT:
1084 es.channel = msg->u.leaf.chip_state_event.channel;
1085 es.status = msg->u.leaf.chip_state_event.status;
1086 es.txerr = msg->u.leaf.chip_state_event.tx_errors_count;
1087 es.rxerr = msg->u.leaf.chip_state_event.rx_errors_count;
1088 es.leaf.error_factor = 0;
1089 break;
1090 default:
1091 dev_err(dev->udev->dev.parent, "Invalid msg id (%d)\n",
1092 msg->id);
1093 return;
1094 }
1095
1096 kvaser_usb_rx_error(dev, &es);
1097 }
1098
1099 static void kvaser_usb_rx_can_err(const struct kvaser_usb_net_priv *priv,
1100 const struct kvaser_msg *msg)
1101 {
1102 struct can_frame *cf;
1103 struct sk_buff *skb;
1104 struct net_device_stats *stats = &priv->netdev->stats;
1105
1106 if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1107 MSG_FLAG_NERR)) {
1108 netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
1109 msg->u.rx_can_header.flag);
1110
1111 stats->rx_errors++;
1112 return;
1113 }
1114
1115 if (msg->u.rx_can_header.flag & MSG_FLAG_OVERRUN) {
1116 stats->rx_over_errors++;
1117 stats->rx_errors++;
1118
1119 skb = alloc_can_err_skb(priv->netdev, &cf);
1120 if (!skb) {
1121 stats->rx_dropped++;
1122 return;
1123 }
1124
1125 cf->can_id |= CAN_ERR_CRTL;
1126 cf->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
1127
1128 stats->rx_packets++;
1129 stats->rx_bytes += cf->can_dlc;
1130 netif_rx(skb);
1131 }
1132 }
1133
1134 static void kvaser_usb_rx_can_msg(const struct kvaser_usb *dev,
1135 const struct kvaser_msg *msg)
1136 {
1137 struct kvaser_usb_net_priv *priv;
1138 struct can_frame *cf;
1139 struct sk_buff *skb;
1140 struct net_device_stats *stats;
1141 u8 channel = msg->u.rx_can_header.channel;
1142 const u8 *rx_msg = NULL; /* GCC */
1143
1144 if (channel >= dev->nchannels) {
1145 dev_err(dev->udev->dev.parent,
1146 "Invalid channel number (%d)\n", channel);
1147 return;
1148 }
1149
1150 priv = dev->nets[channel];
1151 stats = &priv->netdev->stats;
1152
1153 if ((msg->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1154 (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE)) {
1155 kvaser_leaf_rx_error(dev, msg);
1156 return;
1157 } else if (msg->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1158 MSG_FLAG_NERR |
1159 MSG_FLAG_OVERRUN)) {
1160 kvaser_usb_rx_can_err(priv, msg);
1161 return;
1162 } else if (msg->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1163 netdev_warn(priv->netdev,
1164 "Unhandled frame (flags: 0x%02x)",
1165 msg->u.rx_can_header.flag);
1166 return;
1167 }
1168
1169 switch (dev->family) {
1170 case KVASER_LEAF:
1171 rx_msg = msg->u.leaf.rx_can.msg;
1172 break;
1173 case KVASER_USBCAN:
1174 rx_msg = msg->u.usbcan.rx_can.msg;
1175 break;
1176 }
1177
1178 skb = alloc_can_skb(priv->netdev, &cf);
1179 if (!skb) {
1180 stats->tx_dropped++;
1181 return;
1182 }
1183
1184 if (dev->family == KVASER_LEAF && msg->id == CMD_LEAF_LOG_MESSAGE) {
1185 cf->can_id = le32_to_cpu(msg->u.leaf.log_message.id);
1186 if (cf->can_id & KVASER_EXTENDED_FRAME)
1187 cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1188 else
1189 cf->can_id &= CAN_SFF_MASK;
1190
1191 cf->can_dlc = get_can_dlc(msg->u.leaf.log_message.dlc);
1192
1193 if (msg->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1194 cf->can_id |= CAN_RTR_FLAG;
1195 else
1196 memcpy(cf->data, &msg->u.leaf.log_message.data,
1197 cf->can_dlc);
1198 } else {
1199 cf->can_id = ((rx_msg[0] & 0x1f) << 6) | (rx_msg[1] & 0x3f);
1200
1201 if (msg->id == CMD_RX_EXT_MESSAGE) {
1202 cf->can_id <<= 18;
1203 cf->can_id |= ((rx_msg[2] & 0x0f) << 14) |
1204 ((rx_msg[3] & 0xff) << 6) |
1205 (rx_msg[4] & 0x3f);
1206 cf->can_id |= CAN_EFF_FLAG;
1207 }
1208
1209 cf->can_dlc = get_can_dlc(rx_msg[5]);
1210
1211 if (msg->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1212 cf->can_id |= CAN_RTR_FLAG;
1213 else
1214 memcpy(cf->data, &rx_msg[6],
1215 cf->can_dlc);
1216 }
1217
1218 stats->rx_packets++;
1219 stats->rx_bytes += cf->can_dlc;
1220 netif_rx(skb);
1221 }
1222
1223 static void kvaser_usb_start_chip_reply(const struct kvaser_usb *dev,
1224 const struct kvaser_msg *msg)
1225 {
1226 struct kvaser_usb_net_priv *priv;
1227 u8 channel = msg->u.simple.channel;
1228
1229 if (channel >= dev->nchannels) {
1230 dev_err(dev->udev->dev.parent,
1231 "Invalid channel number (%d)\n", channel);
1232 return;
1233 }
1234
1235 priv = dev->nets[channel];
1236
1237 if (completion_done(&priv->start_comp) &&
1238 netif_queue_stopped(priv->netdev)) {
1239 netif_wake_queue(priv->netdev);
1240 } else {
1241 netif_start_queue(priv->netdev);
1242 complete(&priv->start_comp);
1243 }
1244 }
1245
1246 static void kvaser_usb_stop_chip_reply(const struct kvaser_usb *dev,
1247 const struct kvaser_msg *msg)
1248 {
1249 struct kvaser_usb_net_priv *priv;
1250 u8 channel = msg->u.simple.channel;
1251
1252 if (channel >= dev->nchannels) {
1253 dev_err(dev->udev->dev.parent,
1254 "Invalid channel number (%d)\n", channel);
1255 return;
1256 }
1257
1258 priv = dev->nets[channel];
1259
1260 complete(&priv->stop_comp);
1261 }
1262
1263 static void kvaser_usb_handle_message(const struct kvaser_usb *dev,
1264 const struct kvaser_msg *msg)
1265 {
1266 switch (msg->id) {
1267 case CMD_START_CHIP_REPLY:
1268 kvaser_usb_start_chip_reply(dev, msg);
1269 break;
1270
1271 case CMD_STOP_CHIP_REPLY:
1272 kvaser_usb_stop_chip_reply(dev, msg);
1273 break;
1274
1275 case CMD_RX_STD_MESSAGE:
1276 case CMD_RX_EXT_MESSAGE:
1277 kvaser_usb_rx_can_msg(dev, msg);
1278 break;
1279
1280 case CMD_LEAF_LOG_MESSAGE:
1281 if (dev->family != KVASER_LEAF)
1282 goto warn;
1283 kvaser_usb_rx_can_msg(dev, msg);
1284 break;
1285
1286 case CMD_CHIP_STATE_EVENT:
1287 case CMD_CAN_ERROR_EVENT:
1288 if (dev->family == KVASER_LEAF)
1289 kvaser_leaf_rx_error(dev, msg);
1290 else
1291 kvaser_usbcan_rx_error(dev, msg);
1292 break;
1293
1294 case CMD_TX_ACKNOWLEDGE:
1295 kvaser_usb_tx_acknowledge(dev, msg);
1296 break;
1297
1298 /* Ignored messages */
1299 case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1300 if (dev->family != KVASER_USBCAN)
1301 goto warn;
1302 break;
1303
1304 default:
1305 warn: dev_warn(dev->udev->dev.parent,
1306 "Unhandled message (%d)\n", msg->id);
1307 break;
1308 }
1309 }
1310
1311 static void kvaser_usb_read_bulk_callback(struct urb *urb)
1312 {
1313 struct kvaser_usb *dev = urb->context;
1314 struct kvaser_msg *msg;
1315 int pos = 0;
1316 int err, i;
1317
1318 switch (urb->status) {
1319 case 0:
1320 break;
1321 case -ENOENT:
1322 case -ESHUTDOWN:
1323 return;
1324 default:
1325 dev_info(dev->udev->dev.parent, "Rx URB aborted (%d)\n",
1326 urb->status);
1327 goto resubmit_urb;
1328 }
1329
1330 while (pos <= urb->actual_length - MSG_HEADER_LEN) {
1331 msg = urb->transfer_buffer + pos;
1332
1333 /* The Kvaser firmware can only read and write messages that
1334 * does not cross the USB's endpoint wMaxPacketSize boundary.
1335 * If a follow-up command crosses such boundary, firmware puts
1336 * a placeholder zero-length command in its place then aligns
1337 * the real command to the next max packet size.
1338 *
1339 * Handle such cases or we're going to miss a significant
1340 * number of events in case of a heavy rx load on the bus.
1341 */
1342 if (msg->len == 0) {
1343 pos = round_up(pos, le16_to_cpu(dev->bulk_in->
1344 wMaxPacketSize));
1345 continue;
1346 }
1347
1348 if (pos + msg->len > urb->actual_length) {
1349 dev_err(dev->udev->dev.parent, "Format error\n");
1350 break;
1351 }
1352
1353 kvaser_usb_handle_message(dev, msg);
1354 pos += msg->len;
1355 }
1356
1357 resubmit_urb:
1358 usb_fill_bulk_urb(urb, dev->udev,
1359 usb_rcvbulkpipe(dev->udev,
1360 dev->bulk_in->bEndpointAddress),
1361 urb->transfer_buffer, RX_BUFFER_SIZE,
1362 kvaser_usb_read_bulk_callback, dev);
1363
1364 err = usb_submit_urb(urb, GFP_ATOMIC);
1365 if (err == -ENODEV) {
1366 for (i = 0; i < dev->nchannels; i++) {
1367 if (!dev->nets[i])
1368 continue;
1369
1370 netif_device_detach(dev->nets[i]->netdev);
1371 }
1372 } else if (err) {
1373 dev_err(dev->udev->dev.parent,
1374 "Failed resubmitting read bulk urb: %d\n", err);
1375 }
1376
1377 return;
1378 }
1379
1380 static int kvaser_usb_setup_rx_urbs(struct kvaser_usb *dev)
1381 {
1382 int i, err = 0;
1383
1384 if (dev->rxinitdone)
1385 return 0;
1386
1387 for (i = 0; i < MAX_RX_URBS; i++) {
1388 struct urb *urb = NULL;
1389 u8 *buf = NULL;
1390 dma_addr_t buf_dma;
1391
1392 urb = usb_alloc_urb(0, GFP_KERNEL);
1393 if (!urb) {
1394 err = -ENOMEM;
1395 break;
1396 }
1397
1398 buf = usb_alloc_coherent(dev->udev, RX_BUFFER_SIZE,
1399 GFP_KERNEL, &buf_dma);
1400 if (!buf) {
1401 dev_warn(dev->udev->dev.parent,
1402 "No memory left for USB buffer\n");
1403 usb_free_urb(urb);
1404 err = -ENOMEM;
1405 break;
1406 }
1407
1408 usb_fill_bulk_urb(urb, dev->udev,
1409 usb_rcvbulkpipe(dev->udev,
1410 dev->bulk_in->bEndpointAddress),
1411 buf, RX_BUFFER_SIZE,
1412 kvaser_usb_read_bulk_callback,
1413 dev);
1414 urb->transfer_dma = buf_dma;
1415 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1416 usb_anchor_urb(urb, &dev->rx_submitted);
1417
1418 err = usb_submit_urb(urb, GFP_KERNEL);
1419 if (err) {
1420 usb_unanchor_urb(urb);
1421 usb_free_coherent(dev->udev, RX_BUFFER_SIZE, buf,
1422 buf_dma);
1423 usb_free_urb(urb);
1424 break;
1425 }
1426
1427 dev->rxbuf[i] = buf;
1428 dev->rxbuf_dma[i] = buf_dma;
1429
1430 usb_free_urb(urb);
1431 }
1432
1433 if (i == 0) {
1434 dev_warn(dev->udev->dev.parent,
1435 "Cannot setup read URBs, error %d\n", err);
1436 return err;
1437 } else if (i < MAX_RX_URBS) {
1438 dev_warn(dev->udev->dev.parent,
1439 "RX performances may be slow\n");
1440 }
1441
1442 dev->rxinitdone = true;
1443
1444 return 0;
1445 }
1446
1447 static int kvaser_usb_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1448 {
1449 struct kvaser_msg *msg;
1450 int rc;
1451
1452 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1453 if (!msg)
1454 return -ENOMEM;
1455
1456 msg->id = CMD_SET_CTRL_MODE;
1457 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_ctrl_mode);
1458 msg->u.ctrl_mode.tid = 0xff;
1459 msg->u.ctrl_mode.channel = priv->channel;
1460
1461 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1462 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1463 else
1464 msg->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1465
1466 rc = kvaser_usb_send_msg(priv->dev, msg);
1467
1468 kfree(msg);
1469 return rc;
1470 }
1471
1472 static int kvaser_usb_start_chip(struct kvaser_usb_net_priv *priv)
1473 {
1474 int err;
1475
1476 init_completion(&priv->start_comp);
1477
1478 err = kvaser_usb_send_simple_msg(priv->dev, CMD_START_CHIP,
1479 priv->channel);
1480 if (err)
1481 return err;
1482
1483 if (!wait_for_completion_timeout(&priv->start_comp,
1484 msecs_to_jiffies(START_TIMEOUT)))
1485 return -ETIMEDOUT;
1486
1487 return 0;
1488 }
1489
1490 static int kvaser_usb_open(struct net_device *netdev)
1491 {
1492 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1493 struct kvaser_usb *dev = priv->dev;
1494 int err;
1495
1496 err = open_candev(netdev);
1497 if (err)
1498 return err;
1499
1500 err = kvaser_usb_setup_rx_urbs(dev);
1501 if (err)
1502 goto error;
1503
1504 err = kvaser_usb_set_opt_mode(priv);
1505 if (err)
1506 goto error;
1507
1508 err = kvaser_usb_start_chip(priv);
1509 if (err) {
1510 netdev_warn(netdev, "Cannot start device, error %d\n", err);
1511 goto error;
1512 }
1513
1514 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1515
1516 return 0;
1517
1518 error:
1519 close_candev(netdev);
1520 return err;
1521 }
1522
1523 static void kvaser_usb_reset_tx_urb_contexts(struct kvaser_usb_net_priv *priv)
1524 {
1525 int i, max_tx_urbs;
1526
1527 max_tx_urbs = priv->dev->max_tx_urbs;
1528
1529 priv->active_tx_contexts = 0;
1530 for (i = 0; i < max_tx_urbs; i++)
1531 priv->tx_contexts[i].echo_index = max_tx_urbs;
1532 }
1533
1534 /* This method might sleep. Do not call it in the atomic context
1535 * of URB completions.
1536 */
1537 static void kvaser_usb_unlink_tx_urbs(struct kvaser_usb_net_priv *priv)
1538 {
1539 usb_kill_anchored_urbs(&priv->tx_submitted);
1540 kvaser_usb_reset_tx_urb_contexts(priv);
1541 }
1542
1543 static void kvaser_usb_unlink_all_urbs(struct kvaser_usb *dev)
1544 {
1545 int i;
1546
1547 usb_kill_anchored_urbs(&dev->rx_submitted);
1548
1549 for (i = 0; i < MAX_RX_URBS; i++)
1550 usb_free_coherent(dev->udev, RX_BUFFER_SIZE,
1551 dev->rxbuf[i],
1552 dev->rxbuf_dma[i]);
1553
1554 for (i = 0; i < dev->nchannels; i++) {
1555 struct kvaser_usb_net_priv *priv = dev->nets[i];
1556
1557 if (priv)
1558 kvaser_usb_unlink_tx_urbs(priv);
1559 }
1560 }
1561
1562 static int kvaser_usb_stop_chip(struct kvaser_usb_net_priv *priv)
1563 {
1564 int err;
1565
1566 init_completion(&priv->stop_comp);
1567
1568 err = kvaser_usb_send_simple_msg(priv->dev, CMD_STOP_CHIP,
1569 priv->channel);
1570 if (err)
1571 return err;
1572
1573 if (!wait_for_completion_timeout(&priv->stop_comp,
1574 msecs_to_jiffies(STOP_TIMEOUT)))
1575 return -ETIMEDOUT;
1576
1577 return 0;
1578 }
1579
1580 static int kvaser_usb_flush_queue(struct kvaser_usb_net_priv *priv)
1581 {
1582 struct kvaser_msg *msg;
1583 int rc;
1584
1585 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1586 if (!msg)
1587 return -ENOMEM;
1588
1589 msg->id = CMD_FLUSH_QUEUE;
1590 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_flush_queue);
1591 msg->u.flush_queue.channel = priv->channel;
1592 msg->u.flush_queue.flags = 0x00;
1593
1594 rc = kvaser_usb_send_msg(priv->dev, msg);
1595
1596 kfree(msg);
1597 return rc;
1598 }
1599
1600 static int kvaser_usb_close(struct net_device *netdev)
1601 {
1602 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1603 struct kvaser_usb *dev = priv->dev;
1604 int err;
1605
1606 netif_stop_queue(netdev);
1607
1608 err = kvaser_usb_flush_queue(priv);
1609 if (err)
1610 netdev_warn(netdev, "Cannot flush queue, error %d\n", err);
1611
1612 if (kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, priv->channel))
1613 netdev_warn(netdev, "Cannot reset card, error %d\n", err);
1614
1615 err = kvaser_usb_stop_chip(priv);
1616 if (err)
1617 netdev_warn(netdev, "Cannot stop device, error %d\n", err);
1618
1619 /* reset tx contexts */
1620 kvaser_usb_unlink_tx_urbs(priv);
1621
1622 priv->can.state = CAN_STATE_STOPPED;
1623 close_candev(priv->netdev);
1624
1625 return 0;
1626 }
1627
1628 static void kvaser_usb_write_bulk_callback(struct urb *urb)
1629 {
1630 struct kvaser_usb_tx_urb_context *context = urb->context;
1631 struct kvaser_usb_net_priv *priv;
1632 struct net_device *netdev;
1633
1634 if (WARN_ON(!context))
1635 return;
1636
1637 priv = context->priv;
1638 netdev = priv->netdev;
1639
1640 kfree(urb->transfer_buffer);
1641
1642 if (!netif_device_present(netdev))
1643 return;
1644
1645 if (urb->status)
1646 netdev_info(netdev, "Tx URB aborted (%d)\n", urb->status);
1647 }
1648
1649 static netdev_tx_t kvaser_usb_start_xmit(struct sk_buff *skb,
1650 struct net_device *netdev)
1651 {
1652 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1653 struct kvaser_usb *dev = priv->dev;
1654 struct net_device_stats *stats = &netdev->stats;
1655 struct can_frame *cf = (struct can_frame *)skb->data;
1656 struct kvaser_usb_tx_urb_context *context = NULL;
1657 struct urb *urb;
1658 void *buf;
1659 struct kvaser_msg *msg;
1660 int i, err, ret = NETDEV_TX_OK;
1661 u8 *msg_tx_can_flags = NULL; /* GCC */
1662 unsigned long flags;
1663
1664 if (can_dropped_invalid_skb(netdev, skb))
1665 return NETDEV_TX_OK;
1666
1667 urb = usb_alloc_urb(0, GFP_ATOMIC);
1668 if (!urb) {
1669 stats->tx_dropped++;
1670 dev_kfree_skb(skb);
1671 return NETDEV_TX_OK;
1672 }
1673
1674 buf = kmalloc(sizeof(struct kvaser_msg), GFP_ATOMIC);
1675 if (!buf) {
1676 stats->tx_dropped++;
1677 dev_kfree_skb(skb);
1678 goto freeurb;
1679 }
1680
1681 msg = buf;
1682 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_tx_can);
1683 msg->u.tx_can.channel = priv->channel;
1684
1685 switch (dev->family) {
1686 case KVASER_LEAF:
1687 msg_tx_can_flags = &msg->u.tx_can.leaf.flags;
1688 break;
1689 case KVASER_USBCAN:
1690 msg_tx_can_flags = &msg->u.tx_can.usbcan.flags;
1691 break;
1692 }
1693
1694 *msg_tx_can_flags = 0;
1695
1696 if (cf->can_id & CAN_EFF_FLAG) {
1697 msg->id = CMD_TX_EXT_MESSAGE;
1698 msg->u.tx_can.msg[0] = (cf->can_id >> 24) & 0x1f;
1699 msg->u.tx_can.msg[1] = (cf->can_id >> 18) & 0x3f;
1700 msg->u.tx_can.msg[2] = (cf->can_id >> 14) & 0x0f;
1701 msg->u.tx_can.msg[3] = (cf->can_id >> 6) & 0xff;
1702 msg->u.tx_can.msg[4] = cf->can_id & 0x3f;
1703 } else {
1704 msg->id = CMD_TX_STD_MESSAGE;
1705 msg->u.tx_can.msg[0] = (cf->can_id >> 6) & 0x1f;
1706 msg->u.tx_can.msg[1] = cf->can_id & 0x3f;
1707 }
1708
1709 msg->u.tx_can.msg[5] = cf->can_dlc;
1710 memcpy(&msg->u.tx_can.msg[6], cf->data, cf->can_dlc);
1711
1712 if (cf->can_id & CAN_RTR_FLAG)
1713 *msg_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
1714
1715 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1716 for (i = 0; i < dev->max_tx_urbs; i++) {
1717 if (priv->tx_contexts[i].echo_index == dev->max_tx_urbs) {
1718 context = &priv->tx_contexts[i];
1719
1720 context->echo_index = i;
1721 can_put_echo_skb(skb, netdev, context->echo_index);
1722 ++priv->active_tx_contexts;
1723 if (priv->active_tx_contexts >= dev->max_tx_urbs)
1724 netif_stop_queue(netdev);
1725
1726 break;
1727 }
1728 }
1729 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1730
1731 /* This should never happen; it implies a flow control bug */
1732 if (!context) {
1733 netdev_warn(netdev, "cannot find free context\n");
1734
1735 kfree(buf);
1736 ret = NETDEV_TX_BUSY;
1737 goto freeurb;
1738 }
1739
1740 context->priv = priv;
1741 context->dlc = cf->can_dlc;
1742
1743 msg->u.tx_can.tid = context->echo_index;
1744
1745 usb_fill_bulk_urb(urb, dev->udev,
1746 usb_sndbulkpipe(dev->udev,
1747 dev->bulk_out->bEndpointAddress),
1748 buf, msg->len,
1749 kvaser_usb_write_bulk_callback, context);
1750 usb_anchor_urb(urb, &priv->tx_submitted);
1751
1752 err = usb_submit_urb(urb, GFP_ATOMIC);
1753 if (unlikely(err)) {
1754 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
1755
1756 can_free_echo_skb(netdev, context->echo_index);
1757 context->echo_index = dev->max_tx_urbs;
1758 --priv->active_tx_contexts;
1759 netif_wake_queue(netdev);
1760
1761 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
1762
1763 usb_unanchor_urb(urb);
1764
1765 stats->tx_dropped++;
1766
1767 if (err == -ENODEV)
1768 netif_device_detach(netdev);
1769 else
1770 netdev_warn(netdev, "Failed tx_urb %d\n", err);
1771
1772 goto freeurb;
1773 }
1774
1775 ret = NETDEV_TX_OK;
1776
1777 freeurb:
1778 usb_free_urb(urb);
1779 return ret;
1780 }
1781
1782 static const struct net_device_ops kvaser_usb_netdev_ops = {
1783 .ndo_open = kvaser_usb_open,
1784 .ndo_stop = kvaser_usb_close,
1785 .ndo_start_xmit = kvaser_usb_start_xmit,
1786 .ndo_change_mtu = can_change_mtu,
1787 };
1788
1789 static const struct can_bittiming_const kvaser_usb_bittiming_const = {
1790 .name = "kvaser_usb",
1791 .tseg1_min = KVASER_USB_TSEG1_MIN,
1792 .tseg1_max = KVASER_USB_TSEG1_MAX,
1793 .tseg2_min = KVASER_USB_TSEG2_MIN,
1794 .tseg2_max = KVASER_USB_TSEG2_MAX,
1795 .sjw_max = KVASER_USB_SJW_MAX,
1796 .brp_min = KVASER_USB_BRP_MIN,
1797 .brp_max = KVASER_USB_BRP_MAX,
1798 .brp_inc = KVASER_USB_BRP_INC,
1799 };
1800
1801 static int kvaser_usb_set_bittiming(struct net_device *netdev)
1802 {
1803 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1804 struct can_bittiming *bt = &priv->can.bittiming;
1805 struct kvaser_usb *dev = priv->dev;
1806 struct kvaser_msg *msg;
1807 int rc;
1808
1809 msg = kmalloc(sizeof(*msg), GFP_KERNEL);
1810 if (!msg)
1811 return -ENOMEM;
1812
1813 msg->id = CMD_SET_BUS_PARAMS;
1814 msg->len = MSG_HEADER_LEN + sizeof(struct kvaser_msg_busparams);
1815 msg->u.busparams.channel = priv->channel;
1816 msg->u.busparams.tid = 0xff;
1817 msg->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1818 msg->u.busparams.sjw = bt->sjw;
1819 msg->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1820 msg->u.busparams.tseg2 = bt->phase_seg2;
1821
1822 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1823 msg->u.busparams.no_samp = 3;
1824 else
1825 msg->u.busparams.no_samp = 1;
1826
1827 rc = kvaser_usb_send_msg(dev, msg);
1828
1829 kfree(msg);
1830 return rc;
1831 }
1832
1833 static int kvaser_usb_set_mode(struct net_device *netdev,
1834 enum can_mode mode)
1835 {
1836 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1837 int err;
1838
1839 switch (mode) {
1840 case CAN_MODE_START:
1841 err = kvaser_usb_simple_msg_async(priv, CMD_START_CHIP);
1842 if (err)
1843 return err;
1844 break;
1845 default:
1846 return -EOPNOTSUPP;
1847 }
1848
1849 return 0;
1850 }
1851
1852 static int kvaser_usb_get_berr_counter(const struct net_device *netdev,
1853 struct can_berr_counter *bec)
1854 {
1855 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1856
1857 *bec = priv->bec;
1858
1859 return 0;
1860 }
1861
1862 static void kvaser_usb_remove_interfaces(struct kvaser_usb *dev)
1863 {
1864 int i;
1865
1866 for (i = 0; i < dev->nchannels; i++) {
1867 if (!dev->nets[i])
1868 continue;
1869
1870 unregister_candev(dev->nets[i]->netdev);
1871 }
1872
1873 kvaser_usb_unlink_all_urbs(dev);
1874
1875 for (i = 0; i < dev->nchannels; i++) {
1876 if (!dev->nets[i])
1877 continue;
1878
1879 free_candev(dev->nets[i]->netdev);
1880 }
1881 }
1882
1883 static int kvaser_usb_init_one(struct usb_interface *intf,
1884 const struct usb_device_id *id, int channel)
1885 {
1886 struct kvaser_usb *dev = usb_get_intfdata(intf);
1887 struct net_device *netdev;
1888 struct kvaser_usb_net_priv *priv;
1889 int err;
1890
1891 err = kvaser_usb_send_simple_msg(dev, CMD_RESET_CHIP, channel);
1892 if (err)
1893 return err;
1894
1895 netdev = alloc_candev(sizeof(*priv) +
1896 dev->max_tx_urbs * sizeof(*priv->tx_contexts),
1897 dev->max_tx_urbs);
1898 if (!netdev) {
1899 dev_err(&intf->dev, "Cannot alloc candev\n");
1900 return -ENOMEM;
1901 }
1902
1903 priv = netdev_priv(netdev);
1904
1905 init_usb_anchor(&priv->tx_submitted);
1906 init_completion(&priv->start_comp);
1907 init_completion(&priv->stop_comp);
1908
1909 priv->dev = dev;
1910 priv->netdev = netdev;
1911 priv->channel = channel;
1912
1913 spin_lock_init(&priv->tx_contexts_lock);
1914 kvaser_usb_reset_tx_urb_contexts(priv);
1915
1916 priv->can.state = CAN_STATE_STOPPED;
1917 priv->can.clock.freq = CAN_USB_CLOCK;
1918 priv->can.bittiming_const = &kvaser_usb_bittiming_const;
1919 priv->can.do_set_bittiming = kvaser_usb_set_bittiming;
1920 priv->can.do_set_mode = kvaser_usb_set_mode;
1921 if (id->driver_info & KVASER_HAS_TXRX_ERRORS)
1922 priv->can.do_get_berr_counter = kvaser_usb_get_berr_counter;
1923 priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
1924 if (id->driver_info & KVASER_HAS_SILENT_MODE)
1925 priv->can.ctrlmode_supported |= CAN_CTRLMODE_LISTENONLY;
1926
1927 netdev->flags |= IFF_ECHO;
1928
1929 netdev->netdev_ops = &kvaser_usb_netdev_ops;
1930
1931 SET_NETDEV_DEV(netdev, &intf->dev);
1932 netdev->dev_id = channel;
1933
1934 dev->nets[channel] = priv;
1935
1936 err = register_candev(netdev);
1937 if (err) {
1938 dev_err(&intf->dev, "Failed to register can device\n");
1939 free_candev(netdev);
1940 dev->nets[channel] = NULL;
1941 return err;
1942 }
1943
1944 netdev_dbg(netdev, "device registered\n");
1945
1946 return 0;
1947 }
1948
1949 static int kvaser_usb_get_endpoints(const struct usb_interface *intf,
1950 struct usb_endpoint_descriptor **in,
1951 struct usb_endpoint_descriptor **out)
1952 {
1953 const struct usb_host_interface *iface_desc;
1954 struct usb_endpoint_descriptor *endpoint;
1955 int i;
1956
1957 iface_desc = &intf->altsetting[0];
1958
1959 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1960 endpoint = &iface_desc->endpoint[i].desc;
1961
1962 if (!*in && usb_endpoint_is_bulk_in(endpoint))
1963 *in = endpoint;
1964
1965 if (!*out && usb_endpoint_is_bulk_out(endpoint))
1966 *out = endpoint;
1967
1968 /* use first bulk endpoint for in and out */
1969 if (*in && *out)
1970 return 0;
1971 }
1972
1973 return -ENODEV;
1974 }
1975
1976 static int kvaser_usb_probe(struct usb_interface *intf,
1977 const struct usb_device_id *id)
1978 {
1979 struct kvaser_usb *dev;
1980 int err = -ENOMEM;
1981 int i, retry = 3;
1982
1983 dev = devm_kzalloc(&intf->dev, sizeof(*dev), GFP_KERNEL);
1984 if (!dev)
1985 return -ENOMEM;
1986
1987 if (kvaser_is_leaf(id)) {
1988 dev->family = KVASER_LEAF;
1989 } else if (kvaser_is_usbcan(id)) {
1990 dev->family = KVASER_USBCAN;
1991 } else {
1992 dev_err(&intf->dev,
1993 "Product ID (%d) does not belong to any known Kvaser USB family",
1994 id->idProduct);
1995 return -ENODEV;
1996 }
1997
1998 err = kvaser_usb_get_endpoints(intf, &dev->bulk_in, &dev->bulk_out);
1999 if (err) {
2000 dev_err(&intf->dev, "Cannot get usb endpoint(s)");
2001 return err;
2002 }
2003
2004 dev->udev = interface_to_usbdev(intf);
2005
2006 init_usb_anchor(&dev->rx_submitted);
2007
2008 usb_set_intfdata(intf, dev);
2009
2010 /* On some x86 laptops, plugging a Kvaser device again after
2011 * an unplug makes the firmware always ignore the very first
2012 * command. For such a case, provide some room for retries
2013 * instead of completely exiting the driver.
2014 */
2015 do {
2016 err = kvaser_usb_get_software_info(dev);
2017 } while (--retry && err == -ETIMEDOUT);
2018
2019 if (err) {
2020 dev_err(&intf->dev,
2021 "Cannot get software infos, error %d\n", err);
2022 return err;
2023 }
2024
2025 dev_dbg(&intf->dev, "Firmware version: %d.%d.%d\n",
2026 ((dev->fw_version >> 24) & 0xff),
2027 ((dev->fw_version >> 16) & 0xff),
2028 (dev->fw_version & 0xffff));
2029
2030 dev_dbg(&intf->dev, "Max oustanding tx = %d URBs\n", dev->max_tx_urbs);
2031
2032 err = kvaser_usb_get_card_info(dev);
2033 if (err) {
2034 dev_err(&intf->dev,
2035 "Cannot get card infos, error %d\n", err);
2036 return err;
2037 }
2038
2039 for (i = 0; i < dev->nchannels; i++) {
2040 err = kvaser_usb_init_one(intf, id, i);
2041 if (err) {
2042 kvaser_usb_remove_interfaces(dev);
2043 return err;
2044 }
2045 }
2046
2047 return 0;
2048 }
2049
2050 static void kvaser_usb_disconnect(struct usb_interface *intf)
2051 {
2052 struct kvaser_usb *dev = usb_get_intfdata(intf);
2053
2054 usb_set_intfdata(intf, NULL);
2055
2056 if (!dev)
2057 return;
2058
2059 kvaser_usb_remove_interfaces(dev);
2060 }
2061
2062 static struct usb_driver kvaser_usb_driver = {
2063 .name = "kvaser_usb",
2064 .probe = kvaser_usb_probe,
2065 .disconnect = kvaser_usb_disconnect,
2066 .id_table = kvaser_usb_table,
2067 };
2068
2069 module_usb_driver(kvaser_usb_driver);
2070
2071 MODULE_AUTHOR("Olivier Sobrie <olivier@sobrie.be>");
2072 MODULE_DESCRIPTION("CAN driver for Kvaser CAN/USB devices");
2073 MODULE_LICENSE("GPL v2");
Linux kernel - Deliverables
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