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/units.h>
23 #include <linux/usb.h>
24
25 #include <linux/can.h>
26 #include <linux/can/dev.h>
27 #include <linux/can/error.h>
28 #include <linux/can/netlink.h>
29
30 #include "kvaser_usb.h"
31
32 #define MAX_USBCAN_NET_DEVICES 2
33
34 /* Command header size */
35 #define CMD_HEADER_LEN 2
36
37 /* Kvaser CAN message flags */
38 #define MSG_FLAG_ERROR_FRAME BIT(0)
39 #define MSG_FLAG_OVERRUN BIT(1)
40 #define MSG_FLAG_NERR BIT(2)
41 #define MSG_FLAG_WAKEUP BIT(3)
42 #define MSG_FLAG_REMOTE_FRAME BIT(4)
43 #define MSG_FLAG_RESERVED BIT(5)
44 #define MSG_FLAG_TX_ACK BIT(6)
45 #define MSG_FLAG_TX_REQUEST BIT(7)
46
47 /* CAN states (M16C CxSTRH register) */
48 #define M16C_STATE_BUS_RESET BIT(0)
49 #define M16C_STATE_BUS_ERROR BIT(4)
50 #define M16C_STATE_BUS_PASSIVE BIT(5)
51 #define M16C_STATE_BUS_OFF BIT(6)
52
53 /* Leaf/usbcan command ids */
54 #define CMD_RX_STD_MESSAGE 12
55 #define CMD_TX_STD_MESSAGE 13
56 #define CMD_RX_EXT_MESSAGE 14
57 #define CMD_TX_EXT_MESSAGE 15
58 #define CMD_SET_BUS_PARAMS 16
59 #define CMD_CHIP_STATE_EVENT 20
60 #define CMD_SET_CTRL_MODE 21
61 #define CMD_RESET_CHIP 24
62 #define CMD_START_CHIP 26
63 #define CMD_START_CHIP_REPLY 27
64 #define CMD_STOP_CHIP 28
65 #define CMD_STOP_CHIP_REPLY 29
66
67 #define CMD_USBCAN_CLOCK_OVERFLOW_EVENT 33
68
69 #define CMD_GET_CARD_INFO 34
70 #define CMD_GET_CARD_INFO_REPLY 35
71 #define CMD_GET_SOFTWARE_INFO 38
72 #define CMD_GET_SOFTWARE_INFO_REPLY 39
73 #define CMD_FLUSH_QUEUE 48
74 #define CMD_TX_ACKNOWLEDGE 50
75 #define CMD_CAN_ERROR_EVENT 51
76 #define CMD_FLUSH_QUEUE_REPLY 68
77
78 #define CMD_LEAF_LOG_MESSAGE 106
79
80 /* Leaf frequency options */
81 #define KVASER_USB_LEAF_SWOPTION_FREQ_MASK 0x60
82 #define KVASER_USB_LEAF_SWOPTION_FREQ_16_MHZ_CLK 0
83 #define KVASER_USB_LEAF_SWOPTION_FREQ_32_MHZ_CLK BIT(5)
84 #define KVASER_USB_LEAF_SWOPTION_FREQ_24_MHZ_CLK BIT(6)
85
86 /* error factors */
87 #define M16C_EF_ACKE BIT(0)
88 #define M16C_EF_CRCE BIT(1)
89 #define M16C_EF_FORME BIT(2)
90 #define M16C_EF_STFE BIT(3)
91 #define M16C_EF_BITE0 BIT(4)
92 #define M16C_EF_BITE1 BIT(5)
93 #define M16C_EF_RCVE BIT(6)
94 #define M16C_EF_TRE BIT(7)
95
96 /* Only Leaf-based devices can report M16C error factors,
97 * thus define our own error status flags for USBCANII
98 */
99 #define USBCAN_ERROR_STATE_NONE 0
100 #define USBCAN_ERROR_STATE_TX_ERROR BIT(0)
101 #define USBCAN_ERROR_STATE_RX_ERROR BIT(1)
102 #define USBCAN_ERROR_STATE_BUSERROR BIT(2)
103
104 /* ctrl modes */
105 #define KVASER_CTRL_MODE_NORMAL 1
106 #define KVASER_CTRL_MODE_SILENT 2
107 #define KVASER_CTRL_MODE_SELFRECEPTION 3
108 #define KVASER_CTRL_MODE_OFF 4
109
110 /* Extended CAN identifier flag */
111 #define KVASER_EXTENDED_FRAME BIT(31)
112
113 struct kvaser_cmd_simple {
114 u8 tid;
115 u8 channel;
116 } __packed;
117
118 struct kvaser_cmd_cardinfo {
119 u8 tid;
120 u8 nchannels;
121 __le32 serial_number;
122 __le32 padding0;
123 __le32 clock_resolution;
124 __le32 mfgdate;
125 u8 ean[8];
126 u8 hw_revision;
127 union {
128 struct {
129 u8 usb_hs_mode;
130 } __packed leaf1;
131 struct {
132 u8 padding;
133 } __packed usbcan1;
134 } __packed;
135 __le16 padding1;
136 } __packed;
137
138 struct leaf_cmd_softinfo {
139 u8 tid;
140 u8 padding0;
141 __le32 sw_options;
142 __le32 fw_version;
143 __le16 max_outstanding_tx;
144 __le16 padding1[9];
145 } __packed;
146
147 struct usbcan_cmd_softinfo {
148 u8 tid;
149 u8 fw_name[5];
150 __le16 max_outstanding_tx;
151 u8 padding[6];
152 __le32 fw_version;
153 __le16 checksum;
154 __le16 sw_options;
155 } __packed;
156
157 struct kvaser_cmd_busparams {
158 u8 tid;
159 u8 channel;
160 __le32 bitrate;
161 u8 tseg1;
162 u8 tseg2;
163 u8 sjw;
164 u8 no_samp;
165 } __packed;
166
167 struct kvaser_cmd_tx_can {
168 u8 channel;
169 u8 tid;
170 u8 data[14];
171 union {
172 struct {
173 u8 padding;
174 u8 flags;
175 } __packed leaf;
176 struct {
177 u8 flags;
178 u8 padding;
179 } __packed usbcan;
180 } __packed;
181 } __packed;
182
183 struct kvaser_cmd_rx_can_header {
184 u8 channel;
185 u8 flag;
186 } __packed;
187
188 struct leaf_cmd_rx_can {
189 u8 channel;
190 u8 flag;
191
192 __le16 time[3];
193 u8 data[14];
194 } __packed;
195
196 struct usbcan_cmd_rx_can {
197 u8 channel;
198 u8 flag;
199
200 u8 data[14];
201 __le16 time;
202 } __packed;
203
204 struct leaf_cmd_chip_state_event {
205 u8 tid;
206 u8 channel;
207
208 __le16 time[3];
209 u8 tx_errors_count;
210 u8 rx_errors_count;
211
212 u8 status;
213 u8 padding[3];
214 } __packed;
215
216 struct usbcan_cmd_chip_state_event {
217 u8 tid;
218 u8 channel;
219
220 u8 tx_errors_count;
221 u8 rx_errors_count;
222 __le16 time;
223
224 u8 status;
225 u8 padding[3];
226 } __packed;
227
228 struct kvaser_cmd_tx_acknowledge_header {
229 u8 channel;
230 u8 tid;
231 } __packed;
232
233 struct leaf_cmd_error_event {
234 u8 tid;
235 u8 flags;
236 __le16 time[3];
237 u8 channel;
238 u8 padding;
239 u8 tx_errors_count;
240 u8 rx_errors_count;
241 u8 status;
242 u8 error_factor;
243 } __packed;
244
245 struct usbcan_cmd_error_event {
246 u8 tid;
247 u8 padding;
248 u8 tx_errors_count_ch0;
249 u8 rx_errors_count_ch0;
250 u8 tx_errors_count_ch1;
251 u8 rx_errors_count_ch1;
252 u8 status_ch0;
253 u8 status_ch1;
254 __le16 time;
255 } __packed;
256
257 struct kvaser_cmd_ctrl_mode {
258 u8 tid;
259 u8 channel;
260 u8 ctrl_mode;
261 u8 padding[3];
262 } __packed;
263
264 struct kvaser_cmd_flush_queue {
265 u8 tid;
266 u8 channel;
267 u8 flags;
268 u8 padding[3];
269 } __packed;
270
271 struct leaf_cmd_log_message {
272 u8 channel;
273 u8 flags;
274 __le16 time[3];
275 u8 dlc;
276 u8 time_offset;
277 __le32 id;
278 u8 data[8];
279 } __packed;
280
281 struct kvaser_cmd {
282 u8 len;
283 u8 id;
284 union {
285 struct kvaser_cmd_simple simple;
286 struct kvaser_cmd_cardinfo cardinfo;
287 struct kvaser_cmd_busparams busparams;
288
289 struct kvaser_cmd_rx_can_header rx_can_header;
290 struct kvaser_cmd_tx_acknowledge_header tx_acknowledge_header;
291
292 union {
293 struct leaf_cmd_softinfo softinfo;
294 struct leaf_cmd_rx_can rx_can;
295 struct leaf_cmd_chip_state_event chip_state_event;
296 struct leaf_cmd_error_event error_event;
297 struct leaf_cmd_log_message log_message;
298 } __packed leaf;
299
300 union {
301 struct usbcan_cmd_softinfo softinfo;
302 struct usbcan_cmd_rx_can rx_can;
303 struct usbcan_cmd_chip_state_event chip_state_event;
304 struct usbcan_cmd_error_event error_event;
305 } __packed usbcan;
306
307 struct kvaser_cmd_tx_can tx_can;
308 struct kvaser_cmd_ctrl_mode ctrl_mode;
309 struct kvaser_cmd_flush_queue flush_queue;
310 } u;
311 } __packed;
312
313 #define CMD_SIZE_ANY 0xff
314 #define kvaser_fsize(field) sizeof_field(struct kvaser_cmd, field)
315
316 static const u8 kvaser_usb_leaf_cmd_sizes_leaf[] = {
317 [CMD_START_CHIP_REPLY] = kvaser_fsize(u.simple),
318 [CMD_STOP_CHIP_REPLY] = kvaser_fsize(u.simple),
319 [CMD_GET_CARD_INFO_REPLY] = kvaser_fsize(u.cardinfo),
320 [CMD_TX_ACKNOWLEDGE] = kvaser_fsize(u.tx_acknowledge_header),
321 [CMD_GET_SOFTWARE_INFO_REPLY] = kvaser_fsize(u.leaf.softinfo),
322 [CMD_RX_STD_MESSAGE] = kvaser_fsize(u.leaf.rx_can),
323 [CMD_RX_EXT_MESSAGE] = kvaser_fsize(u.leaf.rx_can),
324 [CMD_LEAF_LOG_MESSAGE] = kvaser_fsize(u.leaf.log_message),
325 [CMD_CHIP_STATE_EVENT] = kvaser_fsize(u.leaf.chip_state_event),
326 [CMD_CAN_ERROR_EVENT] = kvaser_fsize(u.leaf.error_event),
327 /* ignored events: */
328 [CMD_FLUSH_QUEUE_REPLY] = CMD_SIZE_ANY,
329 };
330
331 static const u8 kvaser_usb_leaf_cmd_sizes_usbcan[] = {
332 [CMD_START_CHIP_REPLY] = kvaser_fsize(u.simple),
333 [CMD_STOP_CHIP_REPLY] = kvaser_fsize(u.simple),
334 [CMD_GET_CARD_INFO_REPLY] = kvaser_fsize(u.cardinfo),
335 [CMD_TX_ACKNOWLEDGE] = kvaser_fsize(u.tx_acknowledge_header),
336 [CMD_GET_SOFTWARE_INFO_REPLY] = kvaser_fsize(u.usbcan.softinfo),
337 [CMD_RX_STD_MESSAGE] = kvaser_fsize(u.usbcan.rx_can),
338 [CMD_RX_EXT_MESSAGE] = kvaser_fsize(u.usbcan.rx_can),
339 [CMD_CHIP_STATE_EVENT] = kvaser_fsize(u.usbcan.chip_state_event),
340 [CMD_CAN_ERROR_EVENT] = kvaser_fsize(u.usbcan.error_event),
341 /* ignored events: */
342 [CMD_USBCAN_CLOCK_OVERFLOW_EVENT] = CMD_SIZE_ANY,
343 };
344
345 /* Summary of a kvaser error event, for a unified Leaf/Usbcan error
346 * handling. Some discrepancies between the two families exist:
347 *
348 * - USBCAN firmware does not report M16C "error factors"
349 * - USBCAN controllers has difficulties reporting if the raised error
350 * event is for ch0 or ch1. They leave such arbitration to the OS
351 * driver by letting it compare error counters with previous values
352 * and decide the error event's channel. Thus for USBCAN, the channel
353 * field is only advisory.
354 */
355 struct kvaser_usb_err_summary {
356 u8 channel, status, txerr, rxerr;
357 union {
358 struct {
359 u8 error_factor;
360 } leaf;
361 struct {
362 u8 other_ch_status;
363 u8 error_state;
364 } usbcan;
365 };
366 };
367
368 static const struct can_bittiming_const kvaser_usb_leaf_m16c_bittiming_const = {
369 .name = "kvaser_usb_ucii",
370 .tseg1_min = 4,
371 .tseg1_max = 16,
372 .tseg2_min = 2,
373 .tseg2_max = 8,
374 .sjw_max = 4,
375 .brp_min = 1,
376 .brp_max = 16,
377 .brp_inc = 1,
378 };
379
380 static const struct can_bittiming_const kvaser_usb_leaf_m32c_bittiming_const = {
381 .name = "kvaser_usb_leaf",
382 .tseg1_min = 3,
383 .tseg1_max = 16,
384 .tseg2_min = 2,
385 .tseg2_max = 8,
386 .sjw_max = 4,
387 .brp_min = 2,
388 .brp_max = 128,
389 .brp_inc = 2,
390 };
391
392 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_usbcan_dev_cfg = {
393 .clock = {
394 .freq = 8 * MEGA /* Hz */,
395 },
396 .timestamp_freq = 1,
397 .bittiming_const = &kvaser_usb_leaf_m16c_bittiming_const,
398 };
399
400 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_m32c_dev_cfg = {
401 .clock = {
402 .freq = 16 * MEGA /* Hz */,
403 },
404 .timestamp_freq = 1,
405 .bittiming_const = &kvaser_usb_leaf_m32c_bittiming_const,
406 };
407
408 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_imx_dev_cfg_16mhz = {
409 .clock = {
410 .freq = 16 * MEGA /* Hz */,
411 },
412 .timestamp_freq = 1,
413 .bittiming_const = &kvaser_usb_flexc_bittiming_const,
414 };
415
416 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_imx_dev_cfg_24mhz = {
417 .clock = {
418 .freq = 24 * MEGA /* Hz */,
419 },
420 .timestamp_freq = 1,
421 .bittiming_const = &kvaser_usb_flexc_bittiming_const,
422 };
423
424 static const struct kvaser_usb_dev_cfg kvaser_usb_leaf_imx_dev_cfg_32mhz = {
425 .clock = {
426 .freq = 32 * MEGA /* Hz */,
427 },
428 .timestamp_freq = 1,
429 .bittiming_const = &kvaser_usb_flexc_bittiming_const,
430 };
431
kvaser_usb_leaf_verify_size(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)432 static int kvaser_usb_leaf_verify_size(const struct kvaser_usb *dev,
433 const struct kvaser_cmd *cmd)
434 {
435 /* buffer size >= cmd->len ensured by caller */
436 u8 min_size = 0;
437
438 switch (dev->driver_info->family) {
439 case KVASER_LEAF:
440 if (cmd->id < ARRAY_SIZE(kvaser_usb_leaf_cmd_sizes_leaf))
441 min_size = kvaser_usb_leaf_cmd_sizes_leaf[cmd->id];
442 break;
443 case KVASER_USBCAN:
444 if (cmd->id < ARRAY_SIZE(kvaser_usb_leaf_cmd_sizes_usbcan))
445 min_size = kvaser_usb_leaf_cmd_sizes_usbcan[cmd->id];
446 break;
447 }
448
449 if (min_size == CMD_SIZE_ANY)
450 return 0;
451
452 if (min_size) {
453 min_size += CMD_HEADER_LEN;
454 if (cmd->len >= min_size)
455 return 0;
456
457 dev_err_ratelimited(&dev->intf->dev,
458 "Received command %u too short (size %u, needed %u)",
459 cmd->id, cmd->len, min_size);
460 return -EIO;
461 }
462
463 dev_warn_ratelimited(&dev->intf->dev,
464 "Unhandled command (%d, size %d)\n",
465 cmd->id, cmd->len);
466 return -EINVAL;
467 }
468
469 static void *
kvaser_usb_leaf_frame_to_cmd(const struct kvaser_usb_net_priv * priv,const struct sk_buff * skb,int * cmd_len,u16 transid)470 kvaser_usb_leaf_frame_to_cmd(const struct kvaser_usb_net_priv *priv,
471 const struct sk_buff *skb, int *cmd_len,
472 u16 transid)
473 {
474 struct kvaser_usb *dev = priv->dev;
475 struct kvaser_cmd *cmd;
476 u8 *cmd_tx_can_flags = NULL; /* GCC */
477 struct can_frame *cf = (struct can_frame *)skb->data;
478
479 cmd = kmalloc(sizeof(*cmd), GFP_ATOMIC);
480 if (cmd) {
481 cmd->u.tx_can.tid = transid & 0xff;
482 cmd->len = *cmd_len = CMD_HEADER_LEN +
483 sizeof(struct kvaser_cmd_tx_can);
484 cmd->u.tx_can.channel = priv->channel;
485
486 switch (dev->driver_info->family) {
487 case KVASER_LEAF:
488 cmd_tx_can_flags = &cmd->u.tx_can.leaf.flags;
489 break;
490 case KVASER_USBCAN:
491 cmd_tx_can_flags = &cmd->u.tx_can.usbcan.flags;
492 break;
493 }
494
495 *cmd_tx_can_flags = 0;
496
497 if (cf->can_id & CAN_EFF_FLAG) {
498 cmd->id = CMD_TX_EXT_MESSAGE;
499 cmd->u.tx_can.data[0] = (cf->can_id >> 24) & 0x1f;
500 cmd->u.tx_can.data[1] = (cf->can_id >> 18) & 0x3f;
501 cmd->u.tx_can.data[2] = (cf->can_id >> 14) & 0x0f;
502 cmd->u.tx_can.data[3] = (cf->can_id >> 6) & 0xff;
503 cmd->u.tx_can.data[4] = cf->can_id & 0x3f;
504 } else {
505 cmd->id = CMD_TX_STD_MESSAGE;
506 cmd->u.tx_can.data[0] = (cf->can_id >> 6) & 0x1f;
507 cmd->u.tx_can.data[1] = cf->can_id & 0x3f;
508 }
509
510 cmd->u.tx_can.data[5] = cf->len;
511 memcpy(&cmd->u.tx_can.data[6], cf->data, cf->len);
512
513 if (cf->can_id & CAN_RTR_FLAG)
514 *cmd_tx_can_flags |= MSG_FLAG_REMOTE_FRAME;
515 }
516 return cmd;
517 }
518
kvaser_usb_leaf_wait_cmd(const struct kvaser_usb * dev,u8 id,struct kvaser_cmd * cmd)519 static int kvaser_usb_leaf_wait_cmd(const struct kvaser_usb *dev, u8 id,
520 struct kvaser_cmd *cmd)
521 {
522 struct kvaser_cmd *tmp;
523 void *buf;
524 int actual_len;
525 int err;
526 int pos;
527 unsigned long to = jiffies + msecs_to_jiffies(KVASER_USB_TIMEOUT);
528
529 buf = kzalloc(KVASER_USB_RX_BUFFER_SIZE, GFP_KERNEL);
530 if (!buf)
531 return -ENOMEM;
532
533 do {
534 err = kvaser_usb_recv_cmd(dev, buf, KVASER_USB_RX_BUFFER_SIZE,
535 &actual_len);
536 if (err < 0)
537 goto end;
538
539 pos = 0;
540 while (pos <= actual_len - CMD_HEADER_LEN) {
541 tmp = buf + pos;
542
543 /* Handle commands crossing the USB endpoint max packet
544 * size boundary. Check kvaser_usb_read_bulk_callback()
545 * for further details.
546 */
547 if (tmp->len == 0) {
548 pos = round_up(pos,
549 le16_to_cpu
550 (dev->bulk_in->wMaxPacketSize));
551 continue;
552 }
553
554 if (pos + tmp->len > actual_len) {
555 dev_err_ratelimited(&dev->intf->dev,
556 "Format error\n");
557 break;
558 }
559
560 if (tmp->id == id) {
561 memcpy(cmd, tmp, tmp->len);
562 goto end;
563 }
564
565 pos += tmp->len;
566 }
567 } while (time_before(jiffies, to));
568
569 err = -EINVAL;
570
571 end:
572 kfree(buf);
573
574 if (err == 0)
575 err = kvaser_usb_leaf_verify_size(dev, cmd);
576
577 return err;
578 }
579
kvaser_usb_leaf_send_simple_cmd(const struct kvaser_usb * dev,u8 cmd_id,int channel)580 static int kvaser_usb_leaf_send_simple_cmd(const struct kvaser_usb *dev,
581 u8 cmd_id, int channel)
582 {
583 struct kvaser_cmd *cmd;
584 int rc;
585
586 cmd = kmalloc(sizeof(*cmd), GFP_KERNEL);
587 if (!cmd)
588 return -ENOMEM;
589
590 cmd->id = cmd_id;
591 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_simple);
592 cmd->u.simple.channel = channel;
593 cmd->u.simple.tid = 0xff;
594
595 rc = kvaser_usb_send_cmd(dev, cmd, cmd->len);
596
597 kfree(cmd);
598 return rc;
599 }
600
kvaser_usb_leaf_get_software_info_leaf(struct kvaser_usb * dev,const struct leaf_cmd_softinfo * softinfo)601 static void kvaser_usb_leaf_get_software_info_leaf(struct kvaser_usb *dev,
602 const struct leaf_cmd_softinfo *softinfo)
603 {
604 u32 sw_options = le32_to_cpu(softinfo->sw_options);
605
606 dev->fw_version = le32_to_cpu(softinfo->fw_version);
607 dev->max_tx_urbs = le16_to_cpu(softinfo->max_outstanding_tx);
608
609 if (dev->driver_info->quirks & KVASER_USB_QUIRK_IGNORE_CLK_FREQ) {
610 /* Firmware expects bittiming parameters calculated for 16MHz
611 * clock, regardless of the actual clock
612 */
613 dev->cfg = &kvaser_usb_leaf_m32c_dev_cfg;
614 } else {
615 switch (sw_options & KVASER_USB_LEAF_SWOPTION_FREQ_MASK) {
616 case KVASER_USB_LEAF_SWOPTION_FREQ_16_MHZ_CLK:
617 dev->cfg = &kvaser_usb_leaf_imx_dev_cfg_16mhz;
618 break;
619 case KVASER_USB_LEAF_SWOPTION_FREQ_24_MHZ_CLK:
620 dev->cfg = &kvaser_usb_leaf_imx_dev_cfg_24mhz;
621 break;
622 case KVASER_USB_LEAF_SWOPTION_FREQ_32_MHZ_CLK:
623 dev->cfg = &kvaser_usb_leaf_imx_dev_cfg_32mhz;
624 break;
625 }
626 }
627 }
628
kvaser_usb_leaf_get_software_info_inner(struct kvaser_usb * dev)629 static int kvaser_usb_leaf_get_software_info_inner(struct kvaser_usb *dev)
630 {
631 struct kvaser_cmd cmd;
632 int err;
633
634 err = kvaser_usb_leaf_send_simple_cmd(dev, CMD_GET_SOFTWARE_INFO, 0);
635 if (err)
636 return err;
637
638 err = kvaser_usb_leaf_wait_cmd(dev, CMD_GET_SOFTWARE_INFO_REPLY, &cmd);
639 if (err)
640 return err;
641
642 switch (dev->driver_info->family) {
643 case KVASER_LEAF:
644 kvaser_usb_leaf_get_software_info_leaf(dev, &cmd.u.leaf.softinfo);
645 break;
646 case KVASER_USBCAN:
647 dev->fw_version = le32_to_cpu(cmd.u.usbcan.softinfo.fw_version);
648 dev->max_tx_urbs =
649 le16_to_cpu(cmd.u.usbcan.softinfo.max_outstanding_tx);
650 dev->cfg = &kvaser_usb_leaf_usbcan_dev_cfg;
651 break;
652 }
653
654 return 0;
655 }
656
kvaser_usb_leaf_get_software_info(struct kvaser_usb * dev)657 static int kvaser_usb_leaf_get_software_info(struct kvaser_usb *dev)
658 {
659 int err;
660 int retry = 3;
661
662 /* On some x86 laptops, plugging a Kvaser device again after
663 * an unplug makes the firmware always ignore the very first
664 * command. For such a case, provide some room for retries
665 * instead of completely exiting the driver.
666 */
667 do {
668 err = kvaser_usb_leaf_get_software_info_inner(dev);
669 } while (--retry && err == -ETIMEDOUT);
670
671 return err;
672 }
673
kvaser_usb_leaf_get_card_info(struct kvaser_usb * dev)674 static int kvaser_usb_leaf_get_card_info(struct kvaser_usb *dev)
675 {
676 struct kvaser_cmd cmd;
677 int err;
678
679 err = kvaser_usb_leaf_send_simple_cmd(dev, CMD_GET_CARD_INFO, 0);
680 if (err)
681 return err;
682
683 err = kvaser_usb_leaf_wait_cmd(dev, CMD_GET_CARD_INFO_REPLY, &cmd);
684 if (err)
685 return err;
686
687 dev->nchannels = cmd.u.cardinfo.nchannels;
688 if (dev->nchannels > KVASER_USB_MAX_NET_DEVICES ||
689 (dev->driver_info->family == KVASER_USBCAN &&
690 dev->nchannels > MAX_USBCAN_NET_DEVICES))
691 return -EINVAL;
692
693 return 0;
694 }
695
kvaser_usb_leaf_tx_acknowledge(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)696 static void kvaser_usb_leaf_tx_acknowledge(const struct kvaser_usb *dev,
697 const struct kvaser_cmd *cmd)
698 {
699 struct net_device_stats *stats;
700 struct kvaser_usb_tx_urb_context *context;
701 struct kvaser_usb_net_priv *priv;
702 unsigned long flags;
703 u8 channel, tid;
704
705 channel = cmd->u.tx_acknowledge_header.channel;
706 tid = cmd->u.tx_acknowledge_header.tid;
707
708 if (channel >= dev->nchannels) {
709 dev_err(&dev->intf->dev,
710 "Invalid channel number (%d)\n", channel);
711 return;
712 }
713
714 priv = dev->nets[channel];
715
716 if (!netif_device_present(priv->netdev))
717 return;
718
719 stats = &priv->netdev->stats;
720
721 context = &priv->tx_contexts[tid % dev->max_tx_urbs];
722
723 /* Sometimes the state change doesn't come after a bus-off event */
724 if (priv->can.restart_ms && priv->can.state >= CAN_STATE_BUS_OFF) {
725 struct sk_buff *skb;
726 struct can_frame *cf;
727
728 skb = alloc_can_err_skb(priv->netdev, &cf);
729 if (skb) {
730 cf->can_id |= CAN_ERR_RESTARTED;
731
732 netif_rx(skb);
733 } else {
734 netdev_err(priv->netdev,
735 "No memory left for err_skb\n");
736 }
737
738 priv->can.can_stats.restarts++;
739 netif_carrier_on(priv->netdev);
740
741 priv->can.state = CAN_STATE_ERROR_ACTIVE;
742 }
743
744 spin_lock_irqsave(&priv->tx_contexts_lock, flags);
745
746 stats->tx_packets++;
747 stats->tx_bytes += can_get_echo_skb(priv->netdev,
748 context->echo_index, NULL);
749 context->echo_index = dev->max_tx_urbs;
750 --priv->active_tx_contexts;
751 netif_wake_queue(priv->netdev);
752
753 spin_unlock_irqrestore(&priv->tx_contexts_lock, flags);
754 }
755
kvaser_usb_leaf_simple_cmd_async(struct kvaser_usb_net_priv * priv,u8 cmd_id)756 static int kvaser_usb_leaf_simple_cmd_async(struct kvaser_usb_net_priv *priv,
757 u8 cmd_id)
758 {
759 struct kvaser_cmd *cmd;
760 int err;
761
762 cmd = kzalloc(sizeof(*cmd), GFP_ATOMIC);
763 if (!cmd)
764 return -ENOMEM;
765
766 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_simple);
767 cmd->id = cmd_id;
768 cmd->u.simple.channel = priv->channel;
769
770 err = kvaser_usb_send_cmd_async(priv, cmd, cmd->len);
771 if (err)
772 kfree(cmd);
773
774 return err;
775 }
776
777 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)778 kvaser_usb_leaf_rx_error_update_can_state(struct kvaser_usb_net_priv *priv,
779 const struct kvaser_usb_err_summary *es,
780 struct can_frame *cf)
781 {
782 struct kvaser_usb *dev = priv->dev;
783 struct net_device_stats *stats = &priv->netdev->stats;
784 enum can_state cur_state, new_state, tx_state, rx_state;
785
786 netdev_dbg(priv->netdev, "Error status: 0x%02x\n", es->status);
787
788 new_state = priv->can.state;
789 cur_state = priv->can.state;
790
791 if (es->status & (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
792 new_state = CAN_STATE_BUS_OFF;
793 } else if (es->status & M16C_STATE_BUS_PASSIVE) {
794 new_state = CAN_STATE_ERROR_PASSIVE;
795 } else if (es->status & M16C_STATE_BUS_ERROR) {
796 /* Guard against spurious error events after a busoff */
797 if (cur_state < CAN_STATE_BUS_OFF) {
798 if (es->txerr >= 128 || es->rxerr >= 128)
799 new_state = CAN_STATE_ERROR_PASSIVE;
800 else if (es->txerr >= 96 || es->rxerr >= 96)
801 new_state = CAN_STATE_ERROR_WARNING;
802 else if (cur_state > CAN_STATE_ERROR_ACTIVE)
803 new_state = CAN_STATE_ERROR_ACTIVE;
804 }
805 }
806
807 if (!es->status)
808 new_state = CAN_STATE_ERROR_ACTIVE;
809
810 if (new_state != cur_state) {
811 tx_state = (es->txerr >= es->rxerr) ? new_state : 0;
812 rx_state = (es->txerr <= es->rxerr) ? new_state : 0;
813
814 can_change_state(priv->netdev, cf, tx_state, rx_state);
815 }
816
817 if (priv->can.restart_ms &&
818 cur_state >= CAN_STATE_BUS_OFF &&
819 new_state < CAN_STATE_BUS_OFF)
820 priv->can.can_stats.restarts++;
821
822 switch (dev->driver_info->family) {
823 case KVASER_LEAF:
824 if (es->leaf.error_factor) {
825 priv->can.can_stats.bus_error++;
826 stats->rx_errors++;
827 }
828 break;
829 case KVASER_USBCAN:
830 if (es->usbcan.error_state & USBCAN_ERROR_STATE_TX_ERROR)
831 stats->tx_errors++;
832 if (es->usbcan.error_state & USBCAN_ERROR_STATE_RX_ERROR)
833 stats->rx_errors++;
834 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR)
835 priv->can.can_stats.bus_error++;
836 break;
837 }
838
839 priv->bec.txerr = es->txerr;
840 priv->bec.rxerr = es->rxerr;
841 }
842
kvaser_usb_leaf_rx_error(const struct kvaser_usb * dev,const struct kvaser_usb_err_summary * es)843 static void kvaser_usb_leaf_rx_error(const struct kvaser_usb *dev,
844 const struct kvaser_usb_err_summary *es)
845 {
846 struct can_frame *cf;
847 struct can_frame tmp_cf = { .can_id = CAN_ERR_FLAG,
848 .len = CAN_ERR_DLC };
849 struct sk_buff *skb;
850 struct net_device_stats *stats;
851 struct kvaser_usb_net_priv *priv;
852 enum can_state old_state, new_state;
853
854 if (es->channel >= dev->nchannels) {
855 dev_err(&dev->intf->dev,
856 "Invalid channel number (%d)\n", es->channel);
857 return;
858 }
859
860 priv = dev->nets[es->channel];
861 stats = &priv->netdev->stats;
862
863 /* Update all of the CAN interface's state and error counters before
864 * trying any memory allocation that can actually fail with -ENOMEM.
865 *
866 * We send a temporary stack-allocated error CAN frame to
867 * can_change_state() for the very same reason.
868 *
869 * TODO: Split can_change_state() responsibility between updating the
870 * CAN interface's state and counters, and the setting up of CAN error
871 * frame ID and data to userspace. Remove stack allocation afterwards.
872 */
873 old_state = priv->can.state;
874 kvaser_usb_leaf_rx_error_update_can_state(priv, es, &tmp_cf);
875 new_state = priv->can.state;
876
877 skb = alloc_can_err_skb(priv->netdev, &cf);
878 if (!skb) {
879 stats->rx_dropped++;
880 return;
881 }
882 memcpy(cf, &tmp_cf, sizeof(*cf));
883
884 if (new_state != old_state) {
885 if (es->status &
886 (M16C_STATE_BUS_OFF | M16C_STATE_BUS_RESET)) {
887 if (!priv->can.restart_ms)
888 kvaser_usb_leaf_simple_cmd_async(priv,
889 CMD_STOP_CHIP);
890 netif_carrier_off(priv->netdev);
891 }
892
893 if (priv->can.restart_ms &&
894 old_state >= CAN_STATE_BUS_OFF &&
895 new_state < CAN_STATE_BUS_OFF) {
896 cf->can_id |= CAN_ERR_RESTARTED;
897 netif_carrier_on(priv->netdev);
898 }
899 }
900
901 switch (dev->driver_info->family) {
902 case KVASER_LEAF:
903 if (es->leaf.error_factor) {
904 cf->can_id |= CAN_ERR_BUSERROR | CAN_ERR_PROT;
905
906 if (es->leaf.error_factor & M16C_EF_ACKE)
907 cf->data[3] = CAN_ERR_PROT_LOC_ACK;
908 if (es->leaf.error_factor & M16C_EF_CRCE)
909 cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
910 if (es->leaf.error_factor & M16C_EF_FORME)
911 cf->data[2] |= CAN_ERR_PROT_FORM;
912 if (es->leaf.error_factor & M16C_EF_STFE)
913 cf->data[2] |= CAN_ERR_PROT_STUFF;
914 if (es->leaf.error_factor & M16C_EF_BITE0)
915 cf->data[2] |= CAN_ERR_PROT_BIT0;
916 if (es->leaf.error_factor & M16C_EF_BITE1)
917 cf->data[2] |= CAN_ERR_PROT_BIT1;
918 if (es->leaf.error_factor & M16C_EF_TRE)
919 cf->data[2] |= CAN_ERR_PROT_TX;
920 }
921 break;
922 case KVASER_USBCAN:
923 if (es->usbcan.error_state & USBCAN_ERROR_STATE_BUSERROR)
924 cf->can_id |= CAN_ERR_BUSERROR;
925 break;
926 }
927
928 if (new_state != CAN_STATE_BUS_OFF) {
929 cf->can_id |= CAN_ERR_CNT;
930 cf->data[6] = es->txerr;
931 cf->data[7] = es->rxerr;
932 }
933
934 netif_rx(skb);
935 }
936
937 /* For USBCAN, report error to userspace if the channels's errors counter
938 * has changed, or we're the only channel seeing a bus error state.
939 */
940 static void
kvaser_usb_leaf_usbcan_conditionally_rx_error(const struct kvaser_usb * dev,struct kvaser_usb_err_summary * es)941 kvaser_usb_leaf_usbcan_conditionally_rx_error(const struct kvaser_usb *dev,
942 struct kvaser_usb_err_summary *es)
943 {
944 struct kvaser_usb_net_priv *priv;
945 unsigned int channel;
946 bool report_error;
947
948 channel = es->channel;
949 if (channel >= dev->nchannels) {
950 dev_err(&dev->intf->dev,
951 "Invalid channel number (%d)\n", channel);
952 return;
953 }
954
955 priv = dev->nets[channel];
956 report_error = false;
957
958 if (es->txerr != priv->bec.txerr) {
959 es->usbcan.error_state |= USBCAN_ERROR_STATE_TX_ERROR;
960 report_error = true;
961 }
962 if (es->rxerr != priv->bec.rxerr) {
963 es->usbcan.error_state |= USBCAN_ERROR_STATE_RX_ERROR;
964 report_error = true;
965 }
966 if ((es->status & M16C_STATE_BUS_ERROR) &&
967 !(es->usbcan.other_ch_status & M16C_STATE_BUS_ERROR)) {
968 es->usbcan.error_state |= USBCAN_ERROR_STATE_BUSERROR;
969 report_error = true;
970 }
971
972 if (report_error)
973 kvaser_usb_leaf_rx_error(dev, es);
974 }
975
kvaser_usb_leaf_usbcan_rx_error(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)976 static void kvaser_usb_leaf_usbcan_rx_error(const struct kvaser_usb *dev,
977 const struct kvaser_cmd *cmd)
978 {
979 struct kvaser_usb_err_summary es = { };
980
981 switch (cmd->id) {
982 /* Sometimes errors are sent as unsolicited chip state events */
983 case CMD_CHIP_STATE_EVENT:
984 es.channel = cmd->u.usbcan.chip_state_event.channel;
985 es.status = cmd->u.usbcan.chip_state_event.status;
986 es.txerr = cmd->u.usbcan.chip_state_event.tx_errors_count;
987 es.rxerr = cmd->u.usbcan.chip_state_event.rx_errors_count;
988 kvaser_usb_leaf_usbcan_conditionally_rx_error(dev, &es);
989 break;
990
991 case CMD_CAN_ERROR_EVENT:
992 es.channel = 0;
993 es.status = cmd->u.usbcan.error_event.status_ch0;
994 es.txerr = cmd->u.usbcan.error_event.tx_errors_count_ch0;
995 es.rxerr = cmd->u.usbcan.error_event.rx_errors_count_ch0;
996 es.usbcan.other_ch_status =
997 cmd->u.usbcan.error_event.status_ch1;
998 kvaser_usb_leaf_usbcan_conditionally_rx_error(dev, &es);
999
1000 /* The USBCAN firmware supports up to 2 channels.
1001 * Now that ch0 was checked, check if ch1 has any errors.
1002 */
1003 if (dev->nchannels == MAX_USBCAN_NET_DEVICES) {
1004 es.channel = 1;
1005 es.status = cmd->u.usbcan.error_event.status_ch1;
1006 es.txerr =
1007 cmd->u.usbcan.error_event.tx_errors_count_ch1;
1008 es.rxerr =
1009 cmd->u.usbcan.error_event.rx_errors_count_ch1;
1010 es.usbcan.other_ch_status =
1011 cmd->u.usbcan.error_event.status_ch0;
1012 kvaser_usb_leaf_usbcan_conditionally_rx_error(dev, &es);
1013 }
1014 break;
1015
1016 default:
1017 dev_err(&dev->intf->dev, "Invalid cmd id (%d)\n", cmd->id);
1018 }
1019 }
1020
kvaser_usb_leaf_leaf_rx_error(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1021 static void kvaser_usb_leaf_leaf_rx_error(const struct kvaser_usb *dev,
1022 const struct kvaser_cmd *cmd)
1023 {
1024 struct kvaser_usb_err_summary es = { };
1025
1026 switch (cmd->id) {
1027 case CMD_CAN_ERROR_EVENT:
1028 es.channel = cmd->u.leaf.error_event.channel;
1029 es.status = cmd->u.leaf.error_event.status;
1030 es.txerr = cmd->u.leaf.error_event.tx_errors_count;
1031 es.rxerr = cmd->u.leaf.error_event.rx_errors_count;
1032 es.leaf.error_factor = cmd->u.leaf.error_event.error_factor;
1033 break;
1034 case CMD_LEAF_LOG_MESSAGE:
1035 es.channel = cmd->u.leaf.log_message.channel;
1036 es.status = cmd->u.leaf.log_message.data[0];
1037 es.txerr = cmd->u.leaf.log_message.data[2];
1038 es.rxerr = cmd->u.leaf.log_message.data[3];
1039 es.leaf.error_factor = cmd->u.leaf.log_message.data[1];
1040 break;
1041 case CMD_CHIP_STATE_EVENT:
1042 es.channel = cmd->u.leaf.chip_state_event.channel;
1043 es.status = cmd->u.leaf.chip_state_event.status;
1044 es.txerr = cmd->u.leaf.chip_state_event.tx_errors_count;
1045 es.rxerr = cmd->u.leaf.chip_state_event.rx_errors_count;
1046 es.leaf.error_factor = 0;
1047 break;
1048 default:
1049 dev_err(&dev->intf->dev, "Invalid cmd id (%d)\n", cmd->id);
1050 return;
1051 }
1052
1053 kvaser_usb_leaf_rx_error(dev, &es);
1054 }
1055
kvaser_usb_leaf_rx_can_err(const struct kvaser_usb_net_priv * priv,const struct kvaser_cmd * cmd)1056 static void kvaser_usb_leaf_rx_can_err(const struct kvaser_usb_net_priv *priv,
1057 const struct kvaser_cmd *cmd)
1058 {
1059 if (cmd->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1060 MSG_FLAG_NERR)) {
1061 struct net_device_stats *stats = &priv->netdev->stats;
1062
1063 netdev_err(priv->netdev, "Unknown error (flags: 0x%02x)\n",
1064 cmd->u.rx_can_header.flag);
1065
1066 stats->rx_errors++;
1067 return;
1068 }
1069
1070 if (cmd->u.rx_can_header.flag & MSG_FLAG_OVERRUN)
1071 kvaser_usb_can_rx_over_error(priv->netdev);
1072 }
1073
kvaser_usb_leaf_rx_can_msg(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1074 static void kvaser_usb_leaf_rx_can_msg(const struct kvaser_usb *dev,
1075 const struct kvaser_cmd *cmd)
1076 {
1077 struct kvaser_usb_net_priv *priv;
1078 struct can_frame *cf;
1079 struct sk_buff *skb;
1080 struct net_device_stats *stats;
1081 u8 channel = cmd->u.rx_can_header.channel;
1082 const u8 *rx_data = NULL; /* GCC */
1083
1084 if (channel >= dev->nchannels) {
1085 dev_err(&dev->intf->dev,
1086 "Invalid channel number (%d)\n", channel);
1087 return;
1088 }
1089
1090 priv = dev->nets[channel];
1091 stats = &priv->netdev->stats;
1092
1093 if ((cmd->u.rx_can_header.flag & MSG_FLAG_ERROR_FRAME) &&
1094 (dev->driver_info->family == KVASER_LEAF &&
1095 cmd->id == CMD_LEAF_LOG_MESSAGE)) {
1096 kvaser_usb_leaf_leaf_rx_error(dev, cmd);
1097 return;
1098 } else if (cmd->u.rx_can_header.flag & (MSG_FLAG_ERROR_FRAME |
1099 MSG_FLAG_NERR |
1100 MSG_FLAG_OVERRUN)) {
1101 kvaser_usb_leaf_rx_can_err(priv, cmd);
1102 return;
1103 } else if (cmd->u.rx_can_header.flag & ~MSG_FLAG_REMOTE_FRAME) {
1104 netdev_warn(priv->netdev,
1105 "Unhandled frame (flags: 0x%02x)\n",
1106 cmd->u.rx_can_header.flag);
1107 return;
1108 }
1109
1110 switch (dev->driver_info->family) {
1111 case KVASER_LEAF:
1112 rx_data = cmd->u.leaf.rx_can.data;
1113 break;
1114 case KVASER_USBCAN:
1115 rx_data = cmd->u.usbcan.rx_can.data;
1116 break;
1117 }
1118
1119 skb = alloc_can_skb(priv->netdev, &cf);
1120 if (!skb) {
1121 stats->rx_dropped++;
1122 return;
1123 }
1124
1125 if (dev->driver_info->family == KVASER_LEAF && cmd->id ==
1126 CMD_LEAF_LOG_MESSAGE) {
1127 cf->can_id = le32_to_cpu(cmd->u.leaf.log_message.id);
1128 if (cf->can_id & KVASER_EXTENDED_FRAME)
1129 cf->can_id &= CAN_EFF_MASK | CAN_EFF_FLAG;
1130 else
1131 cf->can_id &= CAN_SFF_MASK;
1132
1133 cf->len = can_cc_dlc2len(cmd->u.leaf.log_message.dlc);
1134
1135 if (cmd->u.leaf.log_message.flags & MSG_FLAG_REMOTE_FRAME)
1136 cf->can_id |= CAN_RTR_FLAG;
1137 else
1138 memcpy(cf->data, &cmd->u.leaf.log_message.data,
1139 cf->len);
1140 } else {
1141 cf->can_id = ((rx_data[0] & 0x1f) << 6) | (rx_data[1] & 0x3f);
1142
1143 if (cmd->id == CMD_RX_EXT_MESSAGE) {
1144 cf->can_id <<= 18;
1145 cf->can_id |= ((rx_data[2] & 0x0f) << 14) |
1146 ((rx_data[3] & 0xff) << 6) |
1147 (rx_data[4] & 0x3f);
1148 cf->can_id |= CAN_EFF_FLAG;
1149 }
1150
1151 cf->len = can_cc_dlc2len(rx_data[5]);
1152
1153 if (cmd->u.rx_can_header.flag & MSG_FLAG_REMOTE_FRAME)
1154 cf->can_id |= CAN_RTR_FLAG;
1155 else
1156 memcpy(cf->data, &rx_data[6], cf->len);
1157 }
1158
1159 stats->rx_packets++;
1160 if (!(cf->can_id & CAN_RTR_FLAG))
1161 stats->rx_bytes += cf->len;
1162 netif_rx(skb);
1163 }
1164
kvaser_usb_leaf_start_chip_reply(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1165 static void kvaser_usb_leaf_start_chip_reply(const struct kvaser_usb *dev,
1166 const struct kvaser_cmd *cmd)
1167 {
1168 struct kvaser_usb_net_priv *priv;
1169 u8 channel = cmd->u.simple.channel;
1170
1171 if (channel >= dev->nchannels) {
1172 dev_err(&dev->intf->dev,
1173 "Invalid channel number (%d)\n", channel);
1174 return;
1175 }
1176
1177 priv = dev->nets[channel];
1178
1179 if (completion_done(&priv->start_comp) &&
1180 netif_queue_stopped(priv->netdev)) {
1181 netif_wake_queue(priv->netdev);
1182 } else {
1183 netif_start_queue(priv->netdev);
1184 complete(&priv->start_comp);
1185 }
1186 }
1187
kvaser_usb_leaf_stop_chip_reply(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1188 static void kvaser_usb_leaf_stop_chip_reply(const struct kvaser_usb *dev,
1189 const struct kvaser_cmd *cmd)
1190 {
1191 struct kvaser_usb_net_priv *priv;
1192 u8 channel = cmd->u.simple.channel;
1193
1194 if (channel >= dev->nchannels) {
1195 dev_err(&dev->intf->dev,
1196 "Invalid channel number (%d)\n", channel);
1197 return;
1198 }
1199
1200 priv = dev->nets[channel];
1201
1202 complete(&priv->stop_comp);
1203 }
1204
kvaser_usb_leaf_handle_command(const struct kvaser_usb * dev,const struct kvaser_cmd * cmd)1205 static void kvaser_usb_leaf_handle_command(const struct kvaser_usb *dev,
1206 const struct kvaser_cmd *cmd)
1207 {
1208 if (kvaser_usb_leaf_verify_size(dev, cmd) < 0)
1209 return;
1210
1211 switch (cmd->id) {
1212 case CMD_START_CHIP_REPLY:
1213 kvaser_usb_leaf_start_chip_reply(dev, cmd);
1214 break;
1215
1216 case CMD_STOP_CHIP_REPLY:
1217 kvaser_usb_leaf_stop_chip_reply(dev, cmd);
1218 break;
1219
1220 case CMD_RX_STD_MESSAGE:
1221 case CMD_RX_EXT_MESSAGE:
1222 kvaser_usb_leaf_rx_can_msg(dev, cmd);
1223 break;
1224
1225 case CMD_LEAF_LOG_MESSAGE:
1226 if (dev->driver_info->family != KVASER_LEAF)
1227 goto warn;
1228 kvaser_usb_leaf_rx_can_msg(dev, cmd);
1229 break;
1230
1231 case CMD_CHIP_STATE_EVENT:
1232 case CMD_CAN_ERROR_EVENT:
1233 if (dev->driver_info->family == KVASER_LEAF)
1234 kvaser_usb_leaf_leaf_rx_error(dev, cmd);
1235 else
1236 kvaser_usb_leaf_usbcan_rx_error(dev, cmd);
1237 break;
1238
1239 case CMD_TX_ACKNOWLEDGE:
1240 kvaser_usb_leaf_tx_acknowledge(dev, cmd);
1241 break;
1242
1243 /* Ignored commands */
1244 case CMD_USBCAN_CLOCK_OVERFLOW_EVENT:
1245 if (dev->driver_info->family != KVASER_USBCAN)
1246 goto warn;
1247 break;
1248
1249 case CMD_FLUSH_QUEUE_REPLY:
1250 if (dev->driver_info->family != KVASER_LEAF)
1251 goto warn;
1252 break;
1253
1254 default:
1255 warn: dev_warn(&dev->intf->dev, "Unhandled command (%d)\n", cmd->id);
1256 break;
1257 }
1258 }
1259
kvaser_usb_leaf_read_bulk_callback(struct kvaser_usb * dev,void * buf,int len)1260 static void kvaser_usb_leaf_read_bulk_callback(struct kvaser_usb *dev,
1261 void *buf, int len)
1262 {
1263 struct kvaser_cmd *cmd;
1264 int pos = 0;
1265
1266 while (pos <= len - CMD_HEADER_LEN) {
1267 cmd = buf + pos;
1268
1269 /* The Kvaser firmware can only read and write commands that
1270 * does not cross the USB's endpoint wMaxPacketSize boundary.
1271 * If a follow-up command crosses such boundary, firmware puts
1272 * a placeholder zero-length command in its place then aligns
1273 * the real command to the next max packet size.
1274 *
1275 * Handle such cases or we're going to miss a significant
1276 * number of events in case of a heavy rx load on the bus.
1277 */
1278 if (cmd->len == 0) {
1279 pos = round_up(pos, le16_to_cpu
1280 (dev->bulk_in->wMaxPacketSize));
1281 continue;
1282 }
1283
1284 if (pos + cmd->len > len) {
1285 dev_err_ratelimited(&dev->intf->dev, "Format error\n");
1286 break;
1287 }
1288
1289 kvaser_usb_leaf_handle_command(dev, cmd);
1290 pos += cmd->len;
1291 }
1292 }
1293
kvaser_usb_leaf_set_opt_mode(const struct kvaser_usb_net_priv * priv)1294 static int kvaser_usb_leaf_set_opt_mode(const struct kvaser_usb_net_priv *priv)
1295 {
1296 struct kvaser_cmd *cmd;
1297 int rc;
1298
1299 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1300 if (!cmd)
1301 return -ENOMEM;
1302
1303 cmd->id = CMD_SET_CTRL_MODE;
1304 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_ctrl_mode);
1305 cmd->u.ctrl_mode.tid = 0xff;
1306 cmd->u.ctrl_mode.channel = priv->channel;
1307
1308 if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
1309 cmd->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_SILENT;
1310 else
1311 cmd->u.ctrl_mode.ctrl_mode = KVASER_CTRL_MODE_NORMAL;
1312
1313 rc = kvaser_usb_send_cmd(priv->dev, cmd, cmd->len);
1314
1315 kfree(cmd);
1316 return rc;
1317 }
1318
kvaser_usb_leaf_start_chip(struct kvaser_usb_net_priv * priv)1319 static int kvaser_usb_leaf_start_chip(struct kvaser_usb_net_priv *priv)
1320 {
1321 int err;
1322
1323 reinit_completion(&priv->start_comp);
1324
1325 err = kvaser_usb_leaf_send_simple_cmd(priv->dev, CMD_START_CHIP,
1326 priv->channel);
1327 if (err)
1328 return err;
1329
1330 if (!wait_for_completion_timeout(&priv->start_comp,
1331 msecs_to_jiffies(KVASER_USB_TIMEOUT)))
1332 return -ETIMEDOUT;
1333
1334 return 0;
1335 }
1336
kvaser_usb_leaf_stop_chip(struct kvaser_usb_net_priv * priv)1337 static int kvaser_usb_leaf_stop_chip(struct kvaser_usb_net_priv *priv)
1338 {
1339 int err;
1340
1341 reinit_completion(&priv->stop_comp);
1342
1343 err = kvaser_usb_leaf_send_simple_cmd(priv->dev, CMD_STOP_CHIP,
1344 priv->channel);
1345 if (err)
1346 return err;
1347
1348 if (!wait_for_completion_timeout(&priv->stop_comp,
1349 msecs_to_jiffies(KVASER_USB_TIMEOUT)))
1350 return -ETIMEDOUT;
1351
1352 return 0;
1353 }
1354
kvaser_usb_leaf_reset_chip(struct kvaser_usb * dev,int channel)1355 static int kvaser_usb_leaf_reset_chip(struct kvaser_usb *dev, int channel)
1356 {
1357 return kvaser_usb_leaf_send_simple_cmd(dev, CMD_RESET_CHIP, channel);
1358 }
1359
kvaser_usb_leaf_flush_queue(struct kvaser_usb_net_priv * priv)1360 static int kvaser_usb_leaf_flush_queue(struct kvaser_usb_net_priv *priv)
1361 {
1362 struct kvaser_cmd *cmd;
1363 int rc;
1364
1365 cmd = kzalloc(sizeof(*cmd), GFP_KERNEL);
1366 if (!cmd)
1367 return -ENOMEM;
1368
1369 cmd->id = CMD_FLUSH_QUEUE;
1370 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_flush_queue);
1371 cmd->u.flush_queue.channel = priv->channel;
1372 cmd->u.flush_queue.flags = 0x00;
1373
1374 rc = kvaser_usb_send_cmd(priv->dev, cmd, cmd->len);
1375
1376 kfree(cmd);
1377 return rc;
1378 }
1379
kvaser_usb_leaf_init_card(struct kvaser_usb * dev)1380 static int kvaser_usb_leaf_init_card(struct kvaser_usb *dev)
1381 {
1382 struct kvaser_usb_dev_card_data *card_data = &dev->card_data;
1383
1384 card_data->ctrlmode_supported |= CAN_CTRLMODE_3_SAMPLES;
1385
1386 return 0;
1387 }
1388
kvaser_usb_leaf_set_bittiming(struct net_device * netdev)1389 static int kvaser_usb_leaf_set_bittiming(struct net_device *netdev)
1390 {
1391 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1392 struct can_bittiming *bt = &priv->can.bittiming;
1393 struct kvaser_usb *dev = priv->dev;
1394 struct kvaser_cmd *cmd;
1395 int rc;
1396
1397 cmd = kmalloc(sizeof(*cmd), GFP_KERNEL);
1398 if (!cmd)
1399 return -ENOMEM;
1400
1401 cmd->id = CMD_SET_BUS_PARAMS;
1402 cmd->len = CMD_HEADER_LEN + sizeof(struct kvaser_cmd_busparams);
1403 cmd->u.busparams.channel = priv->channel;
1404 cmd->u.busparams.tid = 0xff;
1405 cmd->u.busparams.bitrate = cpu_to_le32(bt->bitrate);
1406 cmd->u.busparams.sjw = bt->sjw;
1407 cmd->u.busparams.tseg1 = bt->prop_seg + bt->phase_seg1;
1408 cmd->u.busparams.tseg2 = bt->phase_seg2;
1409
1410 if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
1411 cmd->u.busparams.no_samp = 3;
1412 else
1413 cmd->u.busparams.no_samp = 1;
1414
1415 rc = kvaser_usb_send_cmd(dev, cmd, cmd->len);
1416
1417 kfree(cmd);
1418 return rc;
1419 }
1420
kvaser_usb_leaf_set_mode(struct net_device * netdev,enum can_mode mode)1421 static int kvaser_usb_leaf_set_mode(struct net_device *netdev,
1422 enum can_mode mode)
1423 {
1424 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1425 int err;
1426
1427 switch (mode) {
1428 case CAN_MODE_START:
1429 kvaser_usb_unlink_tx_urbs(priv);
1430
1431 err = kvaser_usb_leaf_simple_cmd_async(priv, CMD_START_CHIP);
1432 if (err)
1433 return err;
1434
1435 priv->can.state = CAN_STATE_ERROR_ACTIVE;
1436 break;
1437 default:
1438 return -EOPNOTSUPP;
1439 }
1440
1441 return 0;
1442 }
1443
kvaser_usb_leaf_get_berr_counter(const struct net_device * netdev,struct can_berr_counter * bec)1444 static int kvaser_usb_leaf_get_berr_counter(const struct net_device *netdev,
1445 struct can_berr_counter *bec)
1446 {
1447 struct kvaser_usb_net_priv *priv = netdev_priv(netdev);
1448
1449 *bec = priv->bec;
1450
1451 return 0;
1452 }
1453
kvaser_usb_leaf_setup_endpoints(struct kvaser_usb * dev)1454 static int kvaser_usb_leaf_setup_endpoints(struct kvaser_usb *dev)
1455 {
1456 const struct usb_host_interface *iface_desc;
1457 struct usb_endpoint_descriptor *endpoint;
1458 int i;
1459
1460 iface_desc = dev->intf->cur_altsetting;
1461
1462 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
1463 endpoint = &iface_desc->endpoint[i].desc;
1464
1465 if (!dev->bulk_in && usb_endpoint_is_bulk_in(endpoint))
1466 dev->bulk_in = endpoint;
1467
1468 if (!dev->bulk_out && usb_endpoint_is_bulk_out(endpoint))
1469 dev->bulk_out = endpoint;
1470
1471 /* use first bulk endpoint for in and out */
1472 if (dev->bulk_in && dev->bulk_out)
1473 return 0;
1474 }
1475
1476 return -ENODEV;
1477 }
1478
1479 const struct kvaser_usb_dev_ops kvaser_usb_leaf_dev_ops = {
1480 .dev_set_mode = kvaser_usb_leaf_set_mode,
1481 .dev_set_bittiming = kvaser_usb_leaf_set_bittiming,
1482 .dev_set_data_bittiming = NULL,
1483 .dev_get_berr_counter = kvaser_usb_leaf_get_berr_counter,
1484 .dev_setup_endpoints = kvaser_usb_leaf_setup_endpoints,
1485 .dev_init_card = kvaser_usb_leaf_init_card,
1486 .dev_get_software_info = kvaser_usb_leaf_get_software_info,
1487 .dev_get_software_details = NULL,
1488 .dev_get_card_info = kvaser_usb_leaf_get_card_info,
1489 .dev_get_capabilities = NULL,
1490 .dev_set_opt_mode = kvaser_usb_leaf_set_opt_mode,
1491 .dev_start_chip = kvaser_usb_leaf_start_chip,
1492 .dev_stop_chip = kvaser_usb_leaf_stop_chip,
1493 .dev_reset_chip = kvaser_usb_leaf_reset_chip,
1494 .dev_flush_queue = kvaser_usb_leaf_flush_queue,
1495 .dev_read_bulk_callback = kvaser_usb_leaf_read_bulk_callback,
1496 .dev_frame_to_cmd = kvaser_usb_leaf_frame_to_cmd,
1497 };
1498
