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