1 // SPDX-License-Identifier: GPL-2.0
2 /* Parts of this driver are based on the following:
3 * - Kvaser linux leaf driver (version 4.78)
4 * - CAN driver for esd CAN-USB/2
5 * - Kvaser linux usbcanII driver (version 5.3)
6 *
7 * Copyright (C) 2002-2018 KVASER AB, Sweden. All rights reserved.
8 * Copyright (C) 2010 Matthias Fuchs <matthias.fuchs@esd.eu>, esd gmbh
9 * Copyright (C) 2012 Olivier Sobrie <olivier@sobrie.be>
10 * Copyright (C) 2015 Valeo S.A.
11 */
12
13 #include <linux/completion.h>
14 #include <linux/device.h>
15 #include <linux/gfp.h>
16 #include <linux/jiffies.h>
17 #include <linux/kernel.h>
18 #include <linux/netdevice.h>
19 #include <linux/spinlock.h>
20 #include <linux/string.h>
21 #include <linux/types.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 #include <linux/can/netlink.h>
28
29 #include "kvaser_usb.h"
30
31 #define MAX_USBCAN_NET_DEVICES 2
32
33 /* Command header size */
34 #define CMD_HEADER_LEN 2
35
36 /* Kvaser CAN message flags */
37 #define MSG_FLAG_ERROR_FRAME BIT(0)
38 #define MSG_FLAG_OVERRUN BIT(1)
39 #define MSG_FLAG_NERR BIT(2)
40 #define MSG_FLAG_WAKEUP BIT(3)
41 #define MSG_FLAG_REMOTE_FRAME BIT(4)
42 #define MSG_FLAG_RESERVED BIT(5)
43 #define MSG_FLAG_TX_ACK BIT(6)
44 #define MSG_FLAG_TX_REQUEST BIT(7)
45
46 /* CAN states (M16C CxSTRH register) */
47 #define M16C_STATE_BUS_RESET BIT(0)
48 #define M16C_STATE_BUS_ERROR BIT(4)
49 #define M16C_STATE_BUS_PASSIVE BIT(5)
50 #define M16C_STATE_BUS_OFF BIT(6)
51
52 /* Leaf/usbcan command ids */
53 #define CMD_RX_STD_MESSAGE 12
54 #define CMD_TX_STD_MESSAGE 13
55 #define CMD_RX_EXT_MESSAGE 14
56 #define CMD_TX_EXT_MESSAGE 15
57 #define CMD_SET_BUS_PARAMS 16
58 #define CMD_CHIP_STATE_EVENT 20
59 #define CMD_SET_CTRL_MODE 21
60 #define CMD_RESET_CHIP 24
61 #define CMD_START_CHIP 26
62 #define CMD_START_CHIP_REPLY 27
63 #define CMD_STOP_CHIP 28
64 #define CMD_STOP_CHIP_REPLY 29
65
66 #define CMD_USBCAN_CLOCK_OVERFLOW_EVENT 33
67
68 #define CMD_GET_CARD_INFO 34
69 #define CMD_GET_CARD_INFO_REPLY 35
70 #define CMD_GET_SOFTWARE_INFO 38
71 #define CMD_GET_SOFTWARE_INFO_REPLY 39
72 #define CMD_FLUSH_QUEUE 48
73 #define CMD_TX_ACKNOWLEDGE 50
74 #define CMD_CAN_ERROR_EVENT 51
75 #define CMD_FLUSH_QUEUE_REPLY 68
76
77 #define CMD_LEAF_LOG_MESSAGE 106
78
79 /* Leaf frequency options */
80 #define KVASER_USB_LEAF_SWOPTION_FREQ_MASK 0x60
81 #define KVASER_USB_LEAF_SWOPTION_FREQ_16_MHZ_CLK 0
82 #define KVASER_USB_LEAF_SWOPTION_FREQ_32_MHZ_CLK BIT(5)
83 #define KVASER_USB_LEAF_SWOPTION_FREQ_24_MHZ_CLK BIT(6)
84
85 /* error factors */
86 #define M16C_EF_ACKE BIT(0)
87 #define M16C_EF_CRCE BIT(1)
88 #define M16C_EF_FORME BIT(2)
89 #define M16C_EF_STFE BIT(3)
90 #define M16C_EF_BITE0 BIT(4)
91 #define M16C_EF_BITE1 BIT(5)
92 #define M16C_EF_RCVE BIT(6)
93 #define M16C_EF_TRE BIT(7)
94
95 /* Only Leaf-based devices can report M16C error factors,
96 * thus define our own error status flags for USBCANII
97 */
98 #define USBCAN_ERROR_STATE_NONE 0
99 #define USBCAN_ERROR_STATE_TX_ERROR BIT(0)
100 #define USBCAN_ERROR_STATE_RX_ERROR BIT(1)
101 #define USBCAN_ERROR_STATE_BUSERROR BIT(2)
102
103 /* ctrl modes */
104 #define KVASER_CTRL_MODE_NORMAL 1
105 #define KVASER_CTRL_MODE_SILENT 2
106 #define KVASER_CTRL_MODE_SELFRECEPTION 3
107 #define KVASER_CTRL_MODE_OFF 4
108
109 /* Extended CAN identifier flag */
110 #define KVASER_EXTENDED_FRAME BIT(31)
111
112 struct kvaser_cmd_simple {
113 u8 tid;
114 u8 channel;
115 } __packed;
116
117 struct kvaser_cmd_cardinfo {
118 u8 tid;
119 u8 nchannels;
120 __le32 serial_number;
121 __le32 padding0;
122 __le32 clock_resolution;
123 __le32 mfgdate;
124 u8 ean[8];
125 u8 hw_revision;
126 union {
127 struct {
128 u8 usb_hs_mode;
129 } __packed leaf1;
130 struct {
131 u8 padding;
132 } __packed usbcan1;
133 } __packed;
134 __le16 padding1;
135 } __packed;
136
137 struct leaf_cmd_softinfo {
138 u8 tid;
139 u8 padding0;
140 __le32 sw_options;
141 __le32 fw_version;
142 __le16 max_outstanding_tx;
143 __le16 padding1[9];
144 } __packed;
145
146 struct usbcan_cmd_softinfo {
147 u8 tid;
148 u8 fw_name[5];
149 __le16 max_outstanding_tx;
150 u8 padding[6];
151 __le32 fw_version;
152 __le16 checksum;
153 __le16 sw_options;
154 } __packed;
155
156 struct kvaser_cmd_busparams {
157 u8 tid;
158 u8 channel;
159 __le32 bitrate;
160 u8 tseg1;
161 u8 tseg2;
162 u8 sjw;
163 u8 no_samp;
164 } __packed;
165
166 struct kvaser_cmd_tx_can {
167 u8 channel;
168 u8 tid;
169 u8 data[14];
170 union {
171 struct {
172 u8 padding;
173 u8 flags;
174 } __packed leaf;
175 struct {
176 u8 flags;
177 u8 padding;
178 } __packed usbcan;
179 } __packed;
180 } __packed;
181
182 struct kvaser_cmd_rx_can_header {
183 u8 channel;
184 u8 flag;
185 } __packed;
186
187 struct leaf_cmd_rx_can {
188 u8 channel;
189 u8 flag;
190
191 __le16 time[3];
192 u8 data[14];
193 } __packed;
194
195 struct usbcan_cmd_rx_can {
196 u8 channel;
197 u8 flag;
198
199 u8 data[14];
200 __le16 time;
201 } __packed;
202
203 struct leaf_cmd_chip_state_event {
204 u8 tid;
205 u8 channel;
206
207 __le16 time[3];
208 u8 tx_errors_count;
209 u8 rx_errors_count;
210
211 u8 status;
212 u8 padding[3];
213 } __packed;
214
215 struct usbcan_cmd_chip_state_event {
216 u8 tid;
217 u8 channel;
218
219 u8 tx_errors_count;
220 u8 rx_errors_count;
221 __le16 time;
222
223 u8 status;
224 u8 padding[3];
225 } __packed;
226
227 struct kvaser_cmd_tx_acknowledge_header {
228 u8 channel;
229 u8 tid;
230 } __packed;
231
232 struct leaf_cmd_error_event {
233 u8 tid;
234 u8 flags;
235 __le16 time[3];
236 u8 channel;
237 u8 padding;
238 u8 tx_errors_count;
239 u8 rx_errors_count;
240 u8 status;
241 u8 error_factor;
242 } __packed;
243
244 struct usbcan_cmd_error_event {
245 u8 tid;
246 u8 padding;
247 u8 tx_errors_count_ch0;
248 u8 rx_errors_count_ch0;
249 u8 tx_errors_count_ch1;
250 u8 rx_errors_count_ch1;
251 u8 status_ch0;
252 u8 status_ch1;
253 __le16 time;
254 } __packed;
255
256 struct kvaser_cmd_ctrl_mode {
257 u8 tid;
258 u8 channel;
259 u8 ctrl_mode;
260 u8 padding[3];
261 } __packed;
262
263 struct kvaser_cmd_flush_queue {
264 u8 tid;
265 u8 channel;
266 u8 flags;
267 u8 padding[3];
268 } __packed;
269
270 struct leaf_cmd_log_message {
271 u8 channel;
272 u8 flags;
273 __le16 time[3];
274 u8 dlc;
275 u8 time_offset;
276 __le32 id;
277 u8 data[8];
278 } __packed;
279
280 struct kvaser_cmd {
281 u8 len;
282 u8 id;
283 union {
284 struct kvaser_cmd_simple simple;
285 struct kvaser_cmd_cardinfo cardinfo;
286 struct kvaser_cmd_busparams busparams;
287
288 struct kvaser_cmd_rx_can_header rx_can_header;
289 struct kvaser_cmd_tx_acknowledge_header tx_acknowledge_header;
290
291 union {
292 struct leaf_cmd_softinfo softinfo;
293 struct leaf_cmd_rx_can rx_can;
294 struct leaf_cmd_chip_state_event chip_state_event;
295 struct leaf_cmd_error_event error_event;
296 struct leaf_cmd_log_message log_message;
297 } __packed leaf;
298
299 union {
300 struct usbcan_cmd_softinfo softinfo;
301 struct usbcan_cmd_rx_can rx_can;
302 struct usbcan_cmd_chip_state_event chip_state_event;
303 struct usbcan_cmd_error_event error_event;
304 } __packed usbcan;
305
306 struct kvaser_cmd_tx_can tx_can;
307 struct kvaser_cmd_ctrl_mode ctrl_mode;
308 struct kvaser_cmd_flush_queue flush_queue;
309 } u;
310 } __packed;
311
312 #define CMD_SIZE_ANY 0xff
313 #define kvaser_fsize(field) sizeof_field(struct kvaser_cmd, field)
314
315 static const u8 kvaser_usb_leaf_cmd_sizes_leaf[] = {
316 [CMD_START_CHIP_REPLY] = kvaser_fsize(u.simple),
317 [CMD_STOP_CHIP_REPLY] = kvaser_fsize(u.simple),
318 [CMD_GET_CARD_INFO_REPLY] = kvaser_fsize(u.cardinfo),
319 [CMD_TX_ACKNOWLEDGE] = kvaser_fsize(u.tx_acknowledge_header),
320 [CMD_GET_SOFTWARE_INFO_REPLY] = kvaser_fsize(u.leaf.softinfo),
321 [CMD_RX_STD_MESSAGE] = kvaser_fsize(u.leaf.rx_can),
322 [CMD_RX_EXT_MESSAGE] = kvaser_fsize(u.leaf.rx_can),
323 [CMD_LEAF_LOG_MESSAGE] = kvaser_fsize(u.leaf.log_message),
324 [CMD_CHIP_STATE_EVENT] = kvaser_fsize(u.leaf.chip_state_event),
325 [CMD_CAN_ERROR_EVENT] = kvaser_fsize(u.leaf.error_event),
326 /* ignored events: */
327 [CMD_FLUSH_QUEUE_REPLY] = CMD_SIZE_ANY,
328 };
329
330 static const u8 kvaser_usb_leaf_cmd_sizes_usbcan[] = {
331 [CMD_START_CHIP_REPLY] = kvaser_fsize(u.simple),
332 [CMD_STOP_CHIP_REPLY] = kvaser_fsize(u.simple),
333 [CMD_GET_CARD_INFO_REPLY] = kvaser_fsize(u.cardinfo),
334 [CMD_TX_ACKNOWLEDGE] = kvaser_fsize(u.tx_acknowledge_header),
335 [CMD_GET_SOFTWARE_INFO_REPLY] = kvaser_fsize(u.usbcan.softinfo),
336 [CMD_RX_STD_MESSAGE] = kvaser_fsize(u.usbcan.rx_can),
337 [CMD_RX_EXT_MESSAGE] = kvaser_fsize(u.usbcan.rx_can),
338 [CMD_CHIP_STATE_EVENT] = kvaser_fsize(u.usbcan.chip_state_event),
339 [CMD_CAN_ERROR_EVENT] = kvaser_fsize(u.usbcan.error_event),
340 /* ignored events: */
341 [CMD_USBCAN_CLOCK_OVERFLOW_EVENT] = CMD_SIZE_ANY,
342 };
343
344 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
345 * handling. Some discrepancies between the two families exist:
346 *
347 * - USBCAN firmware does not report M16C "error factors"
348 * - USBCAN controllers has difficulties reporting if the raised error
349 * event is for ch0 or ch1. They leave such arbitration to the OS
350 * driver by letting it compare error counters with previous values
351 * and decide the error event's channel. Thus for USBCAN, the channel
352 * field is only advisory.
353 */
354 struct kvaser_usb_err_summary {
355 u8 channel, status, txerr, rxerr;
356 union {
357 struct {
358 u8 error_factor;
359 } leaf;
360 struct {
361 u8 other_ch_status;
362 u8 error_state;
363 } usbcan;
364 };
365 };
366
367 static const struct can_bittiming_const kvaser_usb_leaf_m16c_bittiming_const = {
368 .name = "kvaser_usb_ucii",
369 .tseg1_min = 4,
370 .tseg1_max = 16,
371 .tseg2_min = 2,
372 .tseg2_max = 8,
373 .sjw_max = 4,
374 .brp_min = 1,
375 .brp_max = 16,
376 .brp_inc = 1,
377 };
378
379 static const struct can_bittiming_const kvaser_usb_leaf_m32c_bittiming_const = {
380 .name = "kvaser_usb_leaf",
381 .tseg1_min = 3,
382 .tseg1_max = 16,
383 .tseg2_min = 2,
384 .tseg2_max = 8,
385 .sjw_max = 4,
386 .brp_min = 2,
387 .brp_max = 128,
388 .brp_inc = 2,
389 };
390
391 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_usbcan_dev_cfg = {
392 .clock = {
393 .freq = 8000000,
394 },
395 .timestamp_freq = 1,
396 .bittiming_const = &kvaser_usb_leaf_m16c_bittiming_const,
397 };
398
399 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_m32c_dev_cfg = {
400 .clock = {
401 .freq = 16000000,
402 },
403 .timestamp_freq = 1,
404 .bittiming_const = &kvaser_usb_leaf_m32c_bittiming_const,
405 };
406
407 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_imx_dev_cfg_16mhz = {
408 .clock = {
409 .freq = 16000000,
410 },
411 .timestamp_freq = 1,
412 .bittiming_const = &kvaser_usb_flexc_bittiming_const,
413 };
414
415 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_imx_dev_cfg_24mhz = {
416 .clock = {
417 .freq = 24000000,
418 },
419 .timestamp_freq = 1,
420 .bittiming_const = &kvaser_usb_flexc_bittiming_const,
421 };
422
423 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_imx_dev_cfg_32mhz = {
424 .clock = {
425 .freq = 32000000,
426 },
427 .timestamp_freq = 1,
428 .bittiming_const = &kvaser_usb_flexc_bittiming_const,
429 };
430
kvaser_usb_leaf_verify_size(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)431 static int kvaser_usb_leaf_verify_size(const struct kvaser_usb *dev,
432 const struct kvaser_cmd *cmd)
433 {
434 /* buffer size >= cmd->len ensured by caller */
435 u8 min_size = 0;
436
437 switch (dev->driver_info->family) {
438 case KVASER_LEAF:
439 if (cmd->id < ARRAY_SIZE(kvaser_usb_leaf_cmd_sizes_leaf))
440 min_size = kvaser_usb_leaf_cmd_sizes_leaf[cmd->id];
441 break;
442 case KVASER_USBCAN:
443 if (cmd->id < ARRAY_SIZE(kvaser_usb_leaf_cmd_sizes_usbcan))
444 min_size = kvaser_usb_leaf_cmd_sizes_usbcan[cmd->id];
445 break;
446 }
447
448 if (min_size == CMD_SIZE_ANY)
449 return 0;
450
451 if (min_size) {
452 min_size += CMD_HEADER_LEN;
453 if (cmd->len >= min_size)
454 return 0;
455
456 dev_err_ratelimited(&dev->intf->dev,
457 "Received command %u too short (size %u, needed %u)",
458 cmd->id, cmd->len, min_size);
459 return -EIO;
460 }
461
462 dev_warn_ratelimited(&dev->intf->dev,
463 "Unhandled command (%d, size %d)\n",
464 cmd->id, cmd->len);
465 return -EINVAL;
466 }
467
468 static void *
kvaser_usb_leaf_frame_to_cmd(const struct kvaser_usb_net_priv * priv,const struct sk_buff * skb,int * frame_len,int * cmd_len,u16 transid)469 kvaser_usb_leaf_frame_to_cmd(const struct kvaser_usb_net_priv *priv,
470 const struct sk_buff *skb, int *frame_len,
471 int *cmd_len, u16 transid)
472 {
473 struct kvaser_usb *dev = priv->dev;
474 struct kvaser_cmd *cmd;
475 u8 *cmd_tx_can_flags = NULL; /* GCC */
476 struct can_frame *cf = (struct can_frame *)skb->data;
477
478 *frame_len = cf->can_dlc;
479
480 cmd = kmalloc(sizeof(*cmd), GFP_ATOMIC);
481 if (cmd) {
482 cmd->u.tx_can.tid = transid & 0xff;
483 cmd->len = *cmd_len = CMD_HEADER_LEN +
484 sizeof(struct kvaser_cmd_tx_can);
485 cmd->u.tx_can.channel = priv->channel;
486
487 switch (dev->driver_info->family) {
488 case KVASER_LEAF:
489 cmd_tx_can_flags = &cmd->u.tx_can.leaf.flags;
490 break;
491 case KVASER_USBCAN:
492 cmd_tx_can_flags = &cmd->u.tx_can.usbcan.flags;
493 break;
494 }
495
496 *cmd_tx_can_flags = 0;
497
498 if (cf->can_id & CAN_EFF_FLAG) {
499 cmd->id = CMD_TX_EXT_MESSAGE;
500 cmd->u.tx_can.data[0] = (cf->can_id >> 24) & 0x1f;
501 cmd->u.tx_can.data[1] = (cf->can_id >> 18) & 0x3f;
502 cmd->u.tx_can.data[2] = (cf->can_id >> 14) & 0x0f;
503 cmd->u.tx_can.data[3] = (cf->can_id >> 6) & 0xff;
504 cmd->u.tx_can.data[4] = cf->can_id & 0x3f;
505 } else {
506 cmd->id = CMD_TX_STD_MESSAGE;
507 cmd->u.tx_can.data[0] = (cf->can_id >> 6) & 0x1f;
508 cmd->u.tx_can.data[1] = cf->can_id & 0x3f;
509 }
510
511 cmd->u.tx_can.data[5] = cf->can_dlc;
512 memcpy(&cmd->u.tx_can.data[6], cf->data, cf->can_dlc);
513
514 if (cf->can_id & CAN_RTR_FLAG)
515 *cmd_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
516 }
517 return cmd;
518 }
519
kvaser_usb_leaf_wait_cmd(const struct kvaser_usb * dev,u8 id,struct kvaser_cmd * cmd)520 static int kvaser_usb_leaf_wait_cmd(const struct kvaser_usb *dev, u8 id,
521 struct kvaser_cmd *cmd)
522 {
523 struct kvaser_cmd *tmp;
524 void *buf;
525 int actual_len;
526 int err;
527 int pos;
528 unsigned long to = jiffies + msecs_to_jiffies(KVASER_USB_TIMEOUT);
529
530 buf = kzalloc(KVASER_USB_RX_BUFFER_SIZE, GFP_KERNEL);
531 if (!buf)
532 return -ENOMEM;
533
534 do {
535 err = kvaser_usb_recv_cmd(dev, buf, KVASER_USB_RX_BUFFER_SIZE,
536 &actual_len);
537 if (err < 0)
538 goto end;
539
540 pos = 0;
541 while (pos <= actual_len - CMD_HEADER_LEN) {
542 tmp = buf + pos;
543
544 /* Handle commands crossing the USB endpoint max packet
545 * size boundary. Check kvaser_usb_read_bulk_callback()
546 * for further details.
547 */
548 if (tmp->len == 0) {
549 pos = round_up(pos,
550 le16_to_cpu
551 (dev->bulk_in->wMaxPacketSize));
552 continue;
553 }
554
555 if (pos + tmp->len > actual_len) {
556 dev_err_ratelimited(&dev->intf->dev,
557 "Format error\n");
558 break;
559 }
560
561 if (tmp->id == id) {
562 memcpy(cmd, tmp, tmp->len);
563 goto end;
564 }
565
566 pos += tmp->len;
567 }
568 } while (time_before(jiffies, to));
569
570 err = -EINVAL;
571
572 end:
573 kfree(buf);
574
575 if (err == 0)
576 err = kvaser_usb_leaf_verify_size(dev, cmd);
577
578 return err;
579 }
580
kvaser_usb_leaf_send_simple_cmd(const struct kvaser_usb * dev,u8 cmd_id,int channel)581 static int kvaser_usb_leaf_send_simple_cmd(const struct kvaser_usb *dev,
582 u8 cmd_id, int channel)
583 {
584 struct kvaser_cmd *cmd;
585 int rc;
586
587 cmd = kmalloc(sizeof(*cmd), GFP_KERNEL);
588 if (!cmd)
589 return -ENOMEM;
590
591 cmd->id = cmd_id;
592 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_simple);
593 cmd->u.simple.channel = channel;
594 cmd->u.simple.tid = 0xff;
595
596 rc = kvaser_usb_send_cmd(dev, cmd, cmd->len);
597
598 kfree(cmd);
599 return rc;
600 }
601
kvaser_usb_leaf_get_software_info_leaf(struct kvaser_usb * dev,const struct leaf_cmd_softinfo * softinfo)602 static void kvaser_usb_leaf_get_software_info_leaf(struct kvaser_usb *dev,
603 const struct leaf_cmd_softinfo *softinfo)
604 {
605 u32 sw_options = le32_to_cpu(softinfo->sw_options);
606
607 dev->fw_version = le32_to_cpu(softinfo->fw_version);
608 dev->max_tx_urbs = le16_to_cpu(softinfo->max_outstanding_tx);
609
610 if (dev->driver_info->quirks & KVASER_USB_QUIRK_IGNORE_CLK_FREQ) {
611 /* Firmware expects bittiming parameters calculated for 16MHz
612 * clock, regardless of the actual clock
613 */
614 dev->cfg = &kvaser_usb_leaf_m32c_dev_cfg;
615 } else {
616 switch (sw_options & KVASER_USB_LEAF_SWOPTION_FREQ_MASK) {
617 case KVASER_USB_LEAF_SWOPTION_FREQ_16_MHZ_CLK:
618 dev->cfg = &kvaser_usb_leaf_imx_dev_cfg_16mhz;
619 break;
620 case KVASER_USB_LEAF_SWOPTION_FREQ_24_MHZ_CLK:
621 dev->cfg = &kvaser_usb_leaf_imx_dev_cfg_24mhz;
622 break;
623 case KVASER_USB_LEAF_SWOPTION_FREQ_32_MHZ_CLK:
624 dev->cfg = &kvaser_usb_leaf_imx_dev_cfg_32mhz;
625 break;
626 }
627 }
628 }
629
kvaser_usb_leaf_get_software_info_inner(struct kvaser_usb * dev)630 static int kvaser_usb_leaf_get_software_info_inner(struct kvaser_usb *dev)
631 {
632 struct kvaser_cmd cmd;
633 int err;
634
635 err = kvaser_usb_leaf_send_simple_cmd(dev, CMD_GET_SOFTWARE_INFO, 0);
636 if (err)
637 return err;
638
639 err = kvaser_usb_leaf_wait_cmd(dev, CMD_GET_SOFTWARE_INFO_REPLY, &cmd);
640 if (err)
641 return err;
642
643 switch (dev->driver_info->family) {
644 case KVASER_LEAF:
645 kvaser_usb_leaf_get_software_info_leaf(dev, &cmd.u.leaf.softinfo);
646 break;
647 case KVASER_USBCAN:
648 dev->fw_version = le32_to_cpu(cmd.u.usbcan.softinfo.fw_version);
649 dev->max_tx_urbs =
650 le16_to_cpu(cmd.u.usbcan.softinfo.max_outstanding_tx);
651 dev->cfg = &kvaser_usb_leaf_usbcan_dev_cfg;
652 break;
653 }
654
655 return 0;
656 }
657
kvaser_usb_leaf_get_software_info(struct kvaser_usb * dev)658 static int kvaser_usb_leaf_get_software_info(struct kvaser_usb *dev)
659 {
660 int err;
661 int retry = 3;
662
663 /* On some x86 laptops, plugging a Kvaser device again after
664 * an unplug makes the firmware always ignore the very first
665 * command. For such a case, provide some room for retries
666 * instead of completely exiting the driver.
667 */
668 do {
669 err = kvaser_usb_leaf_get_software_info_inner(dev);
670 } while (--retry && err == -ETIMEDOUT);
671
672 return err;
673 }
674
kvaser_usb_leaf_get_card_info(struct kvaser_usb * dev)675 static int kvaser_usb_leaf_get_card_info(struct kvaser_usb *dev)
676 {
677 struct kvaser_cmd cmd;
678 int err;
679
680 err = kvaser_usb_leaf_send_simple_cmd(dev, CMD_GET_CARD_INFO, 0);
681 if (err)
682 return err;
683
684 err = kvaser_usb_leaf_wait_cmd(dev, CMD_GET_CARD_INFO_REPLY, &cmd);
685 if (err)
686 return err;
687
688 dev->nchannels = cmd.u.cardinfo.nchannels;
689 if (dev->nchannels > KVASER_USB_MAX_NET_DEVICES ||
690 (dev->driver_info->family == KVASER_USBCAN &&
691 dev->nchannels > MAX_USBCAN_NET_DEVICES))
692 return -EINVAL;
693
694 return 0;
695 }
696
kvaser_usb_leaf_tx_acknowledge(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)697 static void kvaser_usb_leaf_tx_acknowledge(const struct kvaser_usb *dev,
698 const struct kvaser_cmd *cmd)
699 {
700 struct net_device_stats *stats;
701 struct kvaser_usb_tx_urb_context *context;
702 struct kvaser_usb_net_priv *priv;
703 unsigned long flags;
704 u8 channel, tid;
705
706 channel = cmd->u.tx_acknowledge_header.channel;
707 tid = cmd->u.tx_acknowledge_header.tid;
708
709 if (channel >= dev->nchannels) {
710 dev_err(&dev->intf->dev,
711 "Invalid channel number (%d)\n", channel);
712 return;
713 }
714
715 priv = dev->nets[channel];
716
717 if (!netif_device_present(priv->netdev))
718 return;
719
720 stats = &priv->netdev->stats;
721
722 context = &priv->tx_contexts[tid % dev->max_tx_urbs];
723
724 /* Sometimes the state change doesn't come after a bus-off event */
725 if (priv->can.restart_ms && priv->can.state >= CAN_STATE_BUS_OFF) {
726 struct sk_buff *skb;
727 struct can_frame *cf;
728
729 skb = alloc_can_err_skb(priv->netdev, &cf);
730 if (skb) {
731 cf->can_id |= CAN_ERR_RESTARTED;
732
733 stats->rx_packets++;
734 stats->rx_bytes += cf->can_dlc;
735 netif_rx(skb);
736 } else {
737 netdev_err(priv->netdev,
738 "No memory left for err_skb\n");
739 }
740
741 priv->can.can_stats.restarts++;
742 netif_carrier_on(priv->netdev);
743
744 priv->can.state = CAN_STATE_ERROR_ACTIVE;
745 }
746
747 stats->tx_packets++;
748 stats->tx_bytes += context->dlc;
749
750 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
751
752 can_get_echo_skb(priv->netdev, context->echo_index);
753 context->echo_index = dev->max_tx_urbs;
754 --priv->active_tx_contexts;
755 netif_wake_queue(priv->netdev);
756
757 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
758 }
759
kvaser_usb_leaf_simple_cmd_async(struct kvaser_usb_net_priv * priv,u8 cmd_id)760 static int kvaser_usb_leaf_simple_cmd_async(struct kvaser_usb_net_priv *priv,
761 u8 cmd_id)
762 {
763 struct kvaser_cmd *cmd;
764 int err;
765
766 cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
767 if (!cmd)
768 return -ENOMEM;
769
770 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_simple);
771 cmd->id = cmd_id;
772 cmd->u.simple.channel = priv->channel;
773
774 err = kvaser_usb_send_cmd_async(priv, cmd, cmd->len);
775 if (err)
776 kfree(cmd);
777
778 return err;
779 }
780
781 static void
kvaser_usb_leaf_rx_error_update_can_state(struct kvaser_usb_net_priv * priv,const struct kvaser_usb_err_summary * es,struct can_frame * cf)782 kvaser_usb_leaf_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
783 const struct kvaser_usb_err_summary *es,
784 struct can_frame *cf)
785 {
786 struct kvaser_usb *dev = priv->dev;
787 struct net_device_stats *stats = &priv->netdev->stats;
788 enum can_state cur_state, new_state, tx_state, rx_state;
789
790 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
791
792 new_state = priv->can.state;
793 cur_state = priv->can.state;
794
795 if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
796 new_state = CAN_STATE_BUS_OFF;
797 } else if (es->status & M16C_STATE_BUS_PASSIVE) {
798 new_state = CAN_STATE_ERROR_PASSIVE;
799 } else if (es->status & M16C_STATE_BUS_ERROR) {
800 /* Guard against spurious error events after a busoff */
801 if (cur_state < CAN_STATE_BUS_OFF) {
802 if (es->txerr >= 128 || es->rxerr >= 128)
803 new_state = CAN_STATE_ERROR_PASSIVE;
804 else if (es->txerr >= 96 || es->rxerr >= 96)
805 new_state = CAN_STATE_ERROR_WARNING;
806 else if (cur_state > CAN_STATE_ERROR_ACTIVE)
807 new_state = CAN_STATE_ERROR_ACTIVE;
808 }
809 }
810
811 if (!es->status)
812 new_state = CAN_STATE_ERROR_ACTIVE;
813
814 if (new_state != cur_state) {
815 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
816 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
817
818 can_change_state(priv->netdev, cf, tx_state, rx_state);
819 }
820
821 if (priv->can.restart_ms &&
822 cur_state >= CAN_STATE_BUS_OFF &&
823 new_state < CAN_STATE_BUS_OFF)
824 priv->can.can_stats.restarts++;
825
826 switch (dev->driver_info->family) {
827 case KVASER_LEAF:
828 if (es->leaf.error_factor) {
829 priv->can.can_stats.bus_error++;
830 stats->rx_errors++;
831 }
832 break;
833 case KVASER_USBCAN:
834 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
835 stats->tx_errors++;
836 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
837 stats->rx_errors++;
838 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR)
839 priv->can.can_stats.bus_error++;
840 break;
841 }
842
843 priv->bec.txerr = es->txerr;
844 priv->bec.rxerr = es->rxerr;
845 }
846
kvaser_usb_leaf_rx_error(const struct kvaser_usb * dev,const struct kvaser_usb_err_summary * es)847 static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
848 const struct kvaser_usb_err_summary *es)
849 {
850 struct can_frame *cf;
851 struct can_frame tmp_cf = { .can_id = CAN_ERR_FLAG,
852 .can_dlc = CAN_ERR_DLC };
853 struct sk_buff *skb;
854 struct net_device_stats *stats;
855 struct kvaser_usb_net_priv *priv;
856 enum can_state old_state, new_state;
857
858 if (es->channel >= dev->nchannels) {
859 dev_err(&dev->intf->dev,
860 "Invalid channel number (%d)\n", es->channel);
861 return;
862 }
863
864 priv = dev->nets[es->channel];
865 stats = &priv->netdev->stats;
866
867 /* Update all of the CAN interface's state and error counters before
868 * trying any memory allocation that can actually fail with -ENOMEM.
869 *
870 * We send a temporary stack-allocated error CAN frame to
871 * can_change_state() for the very same reason.
872 *
873 * TODO: Split can_change_state() responsibility between updating the
874 * CAN interface's state and counters, and the setting up of CAN error
875 * frame ID and data to userspace. Remove stack allocation afterwards.
876 */
877 old_state = priv->can.state;
878 kvaser_usb_leaf_rx_error_update_can_state(priv, es, &tmp_cf);
879 new_state = priv->can.state;
880
881 skb = alloc_can_err_skb(priv->netdev, &cf);
882 if (!skb) {
883 stats->rx_dropped++;
884 return;
885 }
886 memcpy(cf, &tmp_cf, sizeof(*cf));
887
888 if (new_state != old_state) {
889 if (es->status &
890 (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
891 if (!priv->can.restart_ms)
892 kvaser_usb_leaf_simple_cmd_async(priv,
893 CMD_STOP_CHIP);
894 netif_carrier_off(priv->netdev);
895 }
896
897 if (priv->can.restart_ms &&
898 old_state >= CAN_STATE_BUS_OFF &&
899 new_state < CAN_STATE_BUS_OFF) {
900 cf->can_id |= CAN_ERR_RESTARTED;
901 netif_carrier_on(priv->netdev);
902 }
903 }
904
905 switch (dev->driver_info->family) {
906 case KVASER_LEAF:
907 if (es->leaf.error_factor) {
908 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
909
910 if (es->leaf.error_factor & M16C_EF_ACKE)
911 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
912 if (es->leaf.error_factor & M16C_EF_CRCE)
913 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
914 if (es->leaf.error_factor & M16C_EF_FORME)
915 cf->data[2] |= CAN_ERR_PROT_FORM;
916 if (es->leaf.error_factor & M16C_EF_STFE)
917 cf->data[2] |= CAN_ERR_PROT_STUFF;
918 if (es->leaf.error_factor & M16C_EF_BITE0)
919 cf->data[2] |= CAN_ERR_PROT_BIT0;
920 if (es->leaf.error_factor & M16C_EF_BITE1)
921 cf->data[2] |= CAN_ERR_PROT_BIT1;
922 if (es->leaf.error_factor & M16C_EF_TRE)
923 cf->data[2] |= CAN_ERR_PROT_TX;
924 }
925 break;
926 case KVASER_USBCAN:
927 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR)
928 cf->can_id |= CAN_ERR_BUSERROR;
929 break;
930 }
931
932 if (new_state != CAN_STATE_BUS_OFF) {
933 cf->data[6] = es->txerr;
934 cf->data[7] = es->rxerr;
935 }
936
937 stats->rx_packets++;
938 stats->rx_bytes += cf->can_dlc;
939 netif_rx(skb);
940 }
941
942 /* For USBCAN, report error to userspace if the channels's errors counter
943 * has changed, or we're the only channel seeing a bus error state.
944 */
945 static void
kvaser_usb_leaf_usbcan_conditionally_rx_error(const struct kvaser_usb * dev,struct kvaser_usb_err_summary * es)946 kvaser_usb_leaf_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
947 struct kvaser_usb_err_summary *es)
948 {
949 struct kvaser_usb_net_priv *priv;
950 unsigned int channel;
951 bool report_error;
952
953 channel = es->channel;
954 if (channel >= dev->nchannels) {
955 dev_err(&dev->intf->dev,
956 "Invalid channel number (%d)\n", channel);
957 return;
958 }
959
960 priv = dev->nets[channel];
961 report_error = false;
962
963 if (es->txerr != priv->bec.txerr) {
964 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
965 report_error = true;
966 }
967 if (es->rxerr != priv->bec.rxerr) {
968 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
969 report_error = true;
970 }
971 if ((es->status & M16C_STATE_BUS_ERROR) &&
972 !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
973 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
974 report_error = true;
975 }
976
977 if (report_error)
978 kvaser_usb_leaf_rx_error(dev, es);
979 }
980
kvaser_usb_leaf_usbcan_rx_error(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)981 static void kvaser_usb_leaf_usbcan_rx_error(const struct kvaser_usb *dev,
982 const struct kvaser_cmd *cmd)
983 {
984 struct kvaser_usb_err_summary es = { };
985
986 switch (cmd->id) {
987 /* Sometimes errors are sent as unsolicited chip state events */
988 case CMD_CHIP_STATE_EVENT:
989 es.channel = cmd->u.usbcan.chip_state_event.channel;
990 es.status = cmd->u.usbcan.chip_state_event.status;
991 es.txerr = cmd->u.usbcan.chip_state_event.tx_errors_count;
992 es.rxerr = cmd->u.usbcan.chip_state_event.rx_errors_count;
993 kvaser_usb_leaf_usbcan_conditionally_rx_error(dev, &es);
994 break;
995
996 case CMD_CAN_ERROR_EVENT:
997 es.channel = 0;
998 es.status = cmd->u.usbcan.error_event.status_ch0;
999 es.txerr = cmd->u.usbcan.error_event.tx_errors_count_ch0;
1000 es.rxerr = cmd->u.usbcan.error_event.rx_errors_count_ch0;
1001 es.usbcan.other_ch_status =
1002 cmd->u.usbcan.error_event.status_ch1;
1003 kvaser_usb_leaf_usbcan_conditionally_rx_error(dev, &es);
1004
1005 /* The USBCAN firmware supports up to 2 channels.
1006 * Now that ch0 was checked, check if ch1 has any errors.
1007 */
1008 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1009 es.channel = 1;
1010 es.status = cmd->u.usbcan.error_event.status_ch1;
1011 es.txerr =
1012 cmd->u.usbcan.error_event.tx_errors_count_ch1;
1013 es.rxerr =
1014 cmd->u.usbcan.error_event.rx_errors_count_ch1;
1015 es.usbcan.other_ch_status =
1016 cmd->u.usbcan.error_event.status_ch0;
1017 kvaser_usb_leaf_usbcan_conditionally_rx_error(dev, &es);
1018 }
1019 break;
1020
1021 default:
1022 dev_err(&dev->intf->dev, "Invalid cmd id (%d)\n", cmd->id);
1023 }
1024 }
1025
kvaser_usb_leaf_leaf_rx_error(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1026 static void kvaser_usb_leaf_leaf_rx_error(const struct kvaser_usb *dev,
1027 const struct kvaser_cmd *cmd)
1028 {
1029 struct kvaser_usb_err_summary es = { };
1030
1031 switch (cmd->id) {
1032 case CMD_CAN_ERROR_EVENT:
1033 es.channel = cmd->u.leaf.error_event.channel;
1034 es.status = cmd->u.leaf.error_event.status;
1035 es.txerr = cmd->u.leaf.error_event.tx_errors_count;
1036 es.rxerr = cmd->u.leaf.error_event.rx_errors_count;
1037 es.leaf.error_factor = cmd->u.leaf.error_event.error_factor;
1038 break;
1039 case CMD_LEAF_LOG_MESSAGE:
1040 es.channel = cmd->u.leaf.log_message.channel;
1041 es.status = cmd->u.leaf.log_message.data[0];
1042 es.txerr = cmd->u.leaf.log_message.data[2];
1043 es.rxerr = cmd->u.leaf.log_message.data[3];
1044 es.leaf.error_factor = cmd->u.leaf.log_message.data[1];
1045 break;
1046 case CMD_CHIP_STATE_EVENT:
1047 es.channel = cmd->u.leaf.chip_state_event.channel;
1048 es.status = cmd->u.leaf.chip_state_event.status;
1049 es.txerr = cmd->u.leaf.chip_state_event.tx_errors_count;
1050 es.rxerr = cmd->u.leaf.chip_state_event.rx_errors_count;
1051 es.leaf.error_factor = 0;
1052 break;
1053 default:
1054 dev_err(&dev->intf->dev, "Invalid cmd id (%d)\n", cmd->id);
1055 return;
1056 }
1057
1058 kvaser_usb_leaf_rx_error(dev, &es);
1059 }
1060
kvaser_usb_leaf_rx_can_err(const struct kvaser_usb_net_priv * priv,const struct kvaser_cmd * cmd)1061 static void kvaser_usb_leaf_rx_can_err(const struct kvaser_usb_net_priv *priv,
1062 const struct kvaser_cmd *cmd)
1063 {
1064 if (cmd->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1065 MSG_FLAG_NERR)) {
1066 struct net_device_stats *stats = &priv->netdev->stats;
1067
1068 netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
1069 cmd->u.rx_can_header.flag);
1070
1071 stats->rx_errors++;
1072 return;
1073 }
1074
1075 if (cmd->u.rx_can_header.flag & MSG_FLAG_OVERRUN)
1076 kvaser_usb_can_rx_over_error(priv->netdev);
1077 }
1078
kvaser_usb_leaf_rx_can_msg(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1079 static void kvaser_usb_leaf_rx_can_msg(const struct kvaser_usb *dev,
1080 const struct kvaser_cmd *cmd)
1081 {
1082 struct kvaser_usb_net_priv *priv;
1083 struct can_frame *cf;
1084 struct sk_buff *skb;
1085 struct net_device_stats *stats;
1086 u8 channel = cmd->u.rx_can_header.channel;
1087 const u8 *rx_data = NULL; /* GCC */
1088
1089 if (channel >= dev->nchannels) {
1090 dev_err(&dev->intf->dev,
1091 "Invalid channel number (%d)\n", channel);
1092 return;
1093 }
1094
1095 priv = dev->nets[channel];
1096 stats = &priv->netdev->stats;
1097
1098 if ((cmd->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1099 (dev->driver_info->family == KVASER_LEAF &&
1100 cmd->id == CMD_LEAF_LOG_MESSAGE)) {
1101 kvaser_usb_leaf_leaf_rx_error(dev, cmd);
1102 return;
1103 } else if (cmd->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1104 MSG_FLAG_NERR |
1105 MSG_FLAG_OVERRUN)) {
1106 kvaser_usb_leaf_rx_can_err(priv, cmd);
1107 return;
1108 } else if (cmd->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1109 netdev_warn(priv->netdev,
1110 "Unhandled frame (flags: 0x%02x)\n",
1111 cmd->u.rx_can_header.flag);
1112 return;
1113 }
1114
1115 switch (dev->driver_info->family) {
1116 case KVASER_LEAF:
1117 rx_data = cmd->u.leaf.rx_can.data;
1118 break;
1119 case KVASER_USBCAN:
1120 rx_data = cmd->u.usbcan.rx_can.data;
1121 break;
1122 }
1123
1124 skb = alloc_can_skb(priv->netdev, &cf);
1125 if (!skb) {
1126 stats->rx_dropped++;
1127 return;
1128 }
1129
1130 if (dev->driver_info->family == KVASER_LEAF && cmd->id ==
1131 CMD_LEAF_LOG_MESSAGE) {
1132 cf->can_id = le32_to_cpu(cmd->u.leaf.log_message.id);
1133 if (cf->can_id & KVASER_EXTENDED_FRAME)
1134 cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1135 else
1136 cf->can_id &= CAN_SFF_MASK;
1137
1138 cf->can_dlc = get_can_dlc(cmd->u.leaf.log_message.dlc);
1139
1140 if (cmd->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1141 cf->can_id |= CAN_RTR_FLAG;
1142 else
1143 memcpy(cf->data, &cmd->u.leaf.log_message.data,
1144 cf->can_dlc);
1145 } else {
1146 cf->can_id = ((rx_data[0] & 0x1f) << 6) | (rx_data[1] & 0x3f);
1147
1148 if (cmd->id == CMD_RX_EXT_MESSAGE) {
1149 cf->can_id <<= 18;
1150 cf->can_id |= ((rx_data[2] & 0x0f) << 14) |
1151 ((rx_data[3] & 0xff) << 6) |
1152 (rx_data[4] & 0x3f);
1153 cf->can_id |= CAN_EFF_FLAG;
1154 }
1155
1156 cf->can_dlc = get_can_dlc(rx_data[5]);
1157
1158 if (cmd->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1159 cf->can_id |= CAN_RTR_FLAG;
1160 else
1161 memcpy(cf->data, &rx_data[6], cf->can_dlc);
1162 }
1163
1164 stats->rx_packets++;
1165 stats->rx_bytes += cf->can_dlc;
1166 netif_rx(skb);
1167 }
1168
kvaser_usb_leaf_start_chip_reply(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1169 static void kvaser_usb_leaf_start_chip_reply(const struct kvaser_usb *dev,
1170 const struct kvaser_cmd *cmd)
1171 {
1172 struct kvaser_usb_net_priv *priv;
1173 u8 channel = cmd->u.simple.channel;
1174
1175 if (channel >= dev->nchannels) {
1176 dev_err(&dev->intf->dev,
1177 "Invalid channel number (%d)\n", channel);
1178 return;
1179 }
1180
1181 priv = dev->nets[channel];
1182
1183 if (completion_done(&priv->start_comp) &&
1184 netif_queue_stopped(priv->netdev)) {
1185 netif_wake_queue(priv->netdev);
1186 } else {
1187 netif_start_queue(priv->netdev);
1188 complete(&priv->start_comp);
1189 }
1190 }
1191
kvaser_usb_leaf_stop_chip_reply(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1192 static void kvaser_usb_leaf_stop_chip_reply(const struct kvaser_usb *dev,
1193 const struct kvaser_cmd *cmd)
1194 {
1195 struct kvaser_usb_net_priv *priv;
1196 u8 channel = cmd->u.simple.channel;
1197
1198 if (channel >= dev->nchannels) {
1199 dev_err(&dev->intf->dev,
1200 "Invalid channel number (%d)\n", channel);
1201 return;
1202 }
1203
1204 priv = dev->nets[channel];
1205
1206 complete(&priv->stop_comp);
1207 }
1208
kvaser_usb_leaf_handle_command(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1209 static void kvaser_usb_leaf_handle_command(const struct kvaser_usb *dev,
1210 const struct kvaser_cmd *cmd)
1211 {
1212 if (kvaser_usb_leaf_verify_size(dev, cmd) < 0)
1213 return;
1214
1215 switch (cmd->id) {
1216 case CMD_START_CHIP_REPLY:
1217 kvaser_usb_leaf_start_chip_reply(dev, cmd);
1218 break;
1219
1220 case CMD_STOP_CHIP_REPLY:
1221 kvaser_usb_leaf_stop_chip_reply(dev, cmd);
1222 break;
1223
1224 case CMD_RX_STD_MESSAGE:
1225 case CMD_RX_EXT_MESSAGE:
1226 kvaser_usb_leaf_rx_can_msg(dev, cmd);
1227 break;
1228
1229 case CMD_LEAF_LOG_MESSAGE:
1230 if (dev->driver_info->family != KVASER_LEAF)
1231 goto warn;
1232 kvaser_usb_leaf_rx_can_msg(dev, cmd);
1233 break;
1234
1235 case CMD_CHIP_STATE_EVENT:
1236 case CMD_CAN_ERROR_EVENT:
1237 if (dev->driver_info->family == KVASER_LEAF)
1238 kvaser_usb_leaf_leaf_rx_error(dev, cmd);
1239 else
1240 kvaser_usb_leaf_usbcan_rx_error(dev, cmd);
1241 break;
1242
1243 case CMD_TX_ACKNOWLEDGE:
1244 kvaser_usb_leaf_tx_acknowledge(dev, cmd);
1245 break;
1246
1247 /* Ignored commands */
1248 case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1249 if (dev->driver_info->family != KVASER_USBCAN)
1250 goto warn;
1251 break;
1252
1253 case CMD_FLUSH_QUEUE_REPLY:
1254 if (dev->driver_info->family != KVASER_LEAF)
1255 goto warn;
1256 break;
1257
1258 default:
1259 warn: dev_warn(&dev->intf->dev, "Unhandled command (%d)\n", cmd->id);
1260 break;
1261 }
1262 }
1263
kvaser_usb_leaf_read_bulk_callback(struct kvaser_usb * dev,void * buf,int len)1264 static void kvaser_usb_leaf_read_bulk_callback(struct kvaser_usb *dev,
1265 void *buf, int len)
1266 {
1267 struct kvaser_cmd *cmd;
1268 int pos = 0;
1269
1270 while (pos <= len - CMD_HEADER_LEN) {
1271 cmd = buf + pos;
1272
1273 /* The Kvaser firmware can only read and write commands that
1274 * does not cross the USB's endpoint wMaxPacketSize boundary.
1275 * If a follow-up command crosses such boundary, firmware puts
1276 * a placeholder zero-length command in its place then aligns
1277 * the real command to the next max packet size.
1278 *
1279 * Handle such cases or we're going to miss a significant
1280 * number of events in case of a heavy rx load on the bus.
1281 */
1282 if (cmd->len == 0) {
1283 pos = round_up(pos, le16_to_cpu
1284 (dev->bulk_in->wMaxPacketSize));
1285 continue;
1286 }
1287
1288 if (pos + cmd->len > len) {
1289 dev_err_ratelimited(&dev->intf->dev, "Format error\n");
1290 break;
1291 }
1292
1293 kvaser_usb_leaf_handle_command(dev, cmd);
1294 pos += cmd->len;
1295 }
1296 }
1297
kvaser_usb_leaf_set_opt_mode(const struct kvaser_usb_net_priv * priv)1298 static int kvaser_usb_leaf_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1299 {
1300 struct kvaser_cmd *cmd;
1301 int rc;
1302
1303 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1304 if (!cmd)
1305 return -ENOMEM;
1306
1307 cmd->id = CMD_SET_CTRL_MODE;
1308 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_ctrl_mode);
1309 cmd->u.ctrl_mode.tid = 0xff;
1310 cmd->u.ctrl_mode.channel = priv->channel;
1311
1312 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1313 cmd->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1314 else
1315 cmd->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1316
1317 rc = kvaser_usb_send_cmd(priv->dev, cmd, cmd->len);
1318
1319 kfree(cmd);
1320 return rc;
1321 }
1322
kvaser_usb_leaf_start_chip(struct kvaser_usb_net_priv * priv)1323 static int kvaser_usb_leaf_start_chip(struct kvaser_usb_net_priv *priv)
1324 {
1325 int err;
1326
1327 reinit_completion(&priv->start_comp);
1328
1329 err = kvaser_usb_leaf_send_simple_cmd(priv->dev, CMD_START_CHIP,
1330 priv->channel);
1331 if (err)
1332 return err;
1333
1334 if (!wait_for_completion_timeout(&priv->start_comp,
1335 msecs_to_jiffies(KVASER_USB_TIMEOUT)))
1336 return -ETIMEDOUT;
1337
1338 return 0;
1339 }
1340
kvaser_usb_leaf_stop_chip(struct kvaser_usb_net_priv * priv)1341 static int kvaser_usb_leaf_stop_chip(struct kvaser_usb_net_priv *priv)
1342 {
1343 int err;
1344
1345 reinit_completion(&priv->stop_comp);
1346
1347 err = kvaser_usb_leaf_send_simple_cmd(priv->dev, CMD_STOP_CHIP,
1348 priv->channel);
1349 if (err)
1350 return err;
1351
1352 if (!wait_for_completion_timeout(&priv->stop_comp,
1353 msecs_to_jiffies(KVASER_USB_TIMEOUT)))
1354 return -ETIMEDOUT;
1355
1356 return 0;
1357 }
1358
kvaser_usb_leaf_reset_chip(struct kvaser_usb * dev,int channel)1359 static int kvaser_usb_leaf_reset_chip(struct kvaser_usb *dev, int channel)
1360 {
1361 return kvaser_usb_leaf_send_simple_cmd(dev, CMD_RESET_CHIP, channel);
1362 }
1363
kvaser_usb_leaf_flush_queue(struct kvaser_usb_net_priv * priv)1364 static int kvaser_usb_leaf_flush_queue(struct kvaser_usb_net_priv *priv)
1365 {
1366 struct kvaser_cmd *cmd;
1367 int rc;
1368
1369 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1370 if (!cmd)
1371 return -ENOMEM;
1372
1373 cmd->id = CMD_FLUSH_QUEUE;
1374 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_flush_queue);
1375 cmd->u.flush_queue.channel = priv->channel;
1376 cmd->u.flush_queue.flags = 0x00;
1377
1378 rc = kvaser_usb_send_cmd(priv->dev, cmd, cmd->len);
1379
1380 kfree(cmd);
1381 return rc;
1382 }
1383
kvaser_usb_leaf_init_card(struct kvaser_usb * dev)1384 static int kvaser_usb_leaf_init_card(struct kvaser_usb *dev)
1385 {
1386 struct kvaser_usb_dev_card_data *card_data = &dev->card_data;
1387
1388 card_data->ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1389
1390 return 0;
1391 }
1392
kvaser_usb_leaf_set_bittiming(struct net_device * netdev)1393 static int kvaser_usb_leaf_set_bittiming(struct net_device *netdev)
1394 {
1395 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1396 struct can_bittiming *bt = &priv->can.bittiming;
1397 struct kvaser_usb *dev = priv->dev;
1398 struct kvaser_cmd *cmd;
1399 int rc;
1400
1401 cmd = kmalloc(sizeof(*cmd), GFP_KERNEL);
1402 if (!cmd)
1403 return -ENOMEM;
1404
1405 cmd->id = CMD_SET_BUS_PARAMS;
1406 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_busparams);
1407 cmd->u.busparams.channel = priv->channel;
1408 cmd->u.busparams.tid = 0xff;
1409 cmd->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1410 cmd->u.busparams.sjw = bt->sjw;
1411 cmd->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1412 cmd->u.busparams.tseg2 = bt->phase_seg2;
1413
1414 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1415 cmd->u.busparams.no_samp = 3;
1416 else
1417 cmd->u.busparams.no_samp = 1;
1418
1419 rc = kvaser_usb_send_cmd(dev, cmd, cmd->len);
1420
1421 kfree(cmd);
1422 return rc;
1423 }
1424
kvaser_usb_leaf_set_mode(struct net_device * netdev,enum can_mode mode)1425 static int kvaser_usb_leaf_set_mode(struct net_device *netdev,
1426 enum can_mode mode)
1427 {
1428 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1429 int err;
1430
1431 switch (mode) {
1432 case CAN_MODE_START:
1433 kvaser_usb_unlink_tx_urbs(priv);
1434
1435 err = kvaser_usb_leaf_simple_cmd_async(priv, CMD_START_CHIP);
1436 if (err)
1437 return err;
1438
1439 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1440 break;
1441 default:
1442 return -EOPNOTSUPP;
1443 }
1444
1445 return 0;
1446 }
1447
kvaser_usb_leaf_get_berr_counter(const struct net_device * netdev,struct can_berr_counter * bec)1448 static int kvaser_usb_leaf_get_berr_counter(const struct net_device *netdev,
1449 struct can_berr_counter *bec)
1450 {
1451 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1452
1453 *bec = priv->bec;
1454
1455 return 0;
1456 }
1457
kvaser_usb_leaf_setup_endpoints(struct kvaser_usb * dev)1458 static int kvaser_usb_leaf_setup_endpoints(struct kvaser_usb *dev)
1459 {
1460 const struct usb_host_interface *iface_desc;
1461 struct usb_endpoint_descriptor *endpoint;
1462 int i;
1463
1464 iface_desc = dev->intf->cur_altsetting;
1465
1466 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1467 endpoint = &iface_desc->endpoint[i].desc;
1468
1469 if (!dev->bulk_in && usb_endpoint_is_bulk_in(endpoint))
1470 dev->bulk_in = endpoint;
1471
1472 if (!dev->bulk_out && usb_endpoint_is_bulk_out(endpoint))
1473 dev->bulk_out = endpoint;
1474
1475 /* use first bulk endpoint for in and out */
1476 if (dev->bulk_in && dev->bulk_out)
1477 return 0;
1478 }
1479
1480 return -ENODEV;
1481 }
1482
1483 const struct kvaser_usb_dev_ops kvaser_usb_leaf_dev_ops = {
1484 .dev_set_mode = kvaser_usb_leaf_set_mode,
1485 .dev_set_bittiming = kvaser_usb_leaf_set_bittiming,
1486 .dev_set_data_bittiming = NULL,
1487 .dev_get_berr_counter = kvaser_usb_leaf_get_berr_counter,
1488 .dev_setup_endpoints = kvaser_usb_leaf_setup_endpoints,
1489 .dev_init_card = kvaser_usb_leaf_init_card,
1490 .dev_get_software_info = kvaser_usb_leaf_get_software_info,
1491 .dev_get_software_details = NULL,
1492 .dev_get_card_info = kvaser_usb_leaf_get_card_info,
1493 .dev_get_capabilities = NULL,
1494 .dev_set_opt_mode = kvaser_usb_leaf_set_opt_mode,
1495 .dev_start_chip = kvaser_usb_leaf_start_chip,
1496 .dev_stop_chip = kvaser_usb_leaf_stop_chip,
1497 .dev_reset_chip = kvaser_usb_leaf_reset_chip,
1498 .dev_flush_queue = kvaser_usb_leaf_flush_queue,
1499 .dev_read_bulk_callback = kvaser_usb_leaf_read_bulk_callback,
1500 .dev_frame_to_cmd = kvaser_usb_leaf_frame_to_cmd,
1501 };
1502