1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * CAN driver for PEAK System PCAN-USB Pro adapter
4 * Derived from the PCAN project file driver/src/pcan_usbpro.c
5 *
6 * Copyright (C) 2003-2011 PEAK System-Technik GmbH
7 * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com>
8 */
9 #include <linux/netdevice.h>
10 #include <linux/usb.h>
11 #include <linux/module.h>
12
13 #include <linux/can.h>
14 #include <linux/can/dev.h>
15 #include <linux/can/error.h>
16
17 #include "pcan_usb_core.h"
18 #include "pcan_usb_pro.h"
19
20 MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB Pro adapter");
21
22 #define PCAN_USBPRO_CHANNEL_COUNT 2
23
24 /* PCAN-USB Pro adapter internal clock (MHz) */
25 #define PCAN_USBPRO_CRYSTAL_HZ 56000000
26
27 /* PCAN-USB Pro command timeout (ms.) */
28 #define PCAN_USBPRO_COMMAND_TIMEOUT 1000
29
30 /* PCAN-USB Pro rx/tx buffers size */
31 #define PCAN_USBPRO_RX_BUFFER_SIZE 1024
32 #define PCAN_USBPRO_TX_BUFFER_SIZE 64
33
34 #define PCAN_USBPRO_MSG_HEADER_LEN 4
35
36 /* some commands responses need to be re-submitted */
37 #define PCAN_USBPRO_RSP_SUBMIT_MAX 2
38
39 #define PCAN_USBPRO_RTR 0x01
40 #define PCAN_USBPRO_EXT 0x02
41
42 #define PCAN_USBPRO_CMD_BUFFER_SIZE 512
43
44 /* handle device specific info used by the netdevices */
45 struct pcan_usb_pro_interface {
46 struct peak_usb_device *dev[PCAN_USBPRO_CHANNEL_COUNT];
47 struct peak_time_ref time_ref;
48 int cm_ignore_count;
49 int dev_opened_count;
50 };
51
52 /* device information */
53 struct pcan_usb_pro_device {
54 struct peak_usb_device dev;
55 struct pcan_usb_pro_interface *usb_if;
56 u32 cached_ccbt;
57 };
58
59 /* internal structure used to handle messages sent to bulk urb */
60 struct pcan_usb_pro_msg {
61 u8 *rec_ptr;
62 int rec_buffer_size;
63 int rec_buffer_len;
64 union {
65 __le16 *rec_cnt_rd;
66 __le32 *rec_cnt;
67 u8 *rec_buffer;
68 } u;
69 };
70
71 /* records sizes table indexed on message id. (8-bits value) */
72 static u16 pcan_usb_pro_sizeof_rec[256] = {
73 [PCAN_USBPRO_SETBTR] = sizeof(struct pcan_usb_pro_btr),
74 [PCAN_USBPRO_SETBUSACT] = sizeof(struct pcan_usb_pro_busact),
75 [PCAN_USBPRO_SETSILENT] = sizeof(struct pcan_usb_pro_silent),
76 [PCAN_USBPRO_SETFILTR] = sizeof(struct pcan_usb_pro_filter),
77 [PCAN_USBPRO_SETTS] = sizeof(struct pcan_usb_pro_setts),
78 [PCAN_USBPRO_GETDEVID] = sizeof(struct pcan_usb_pro_devid),
79 [PCAN_USBPRO_SETLED] = sizeof(struct pcan_usb_pro_setled),
80 [PCAN_USBPRO_RXMSG8] = sizeof(struct pcan_usb_pro_rxmsg),
81 [PCAN_USBPRO_RXMSG4] = sizeof(struct pcan_usb_pro_rxmsg) - 4,
82 [PCAN_USBPRO_RXMSG0] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
83 [PCAN_USBPRO_RXRTR] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
84 [PCAN_USBPRO_RXSTATUS] = sizeof(struct pcan_usb_pro_rxstatus),
85 [PCAN_USBPRO_RXTS] = sizeof(struct pcan_usb_pro_rxts),
86 [PCAN_USBPRO_TXMSG8] = sizeof(struct pcan_usb_pro_txmsg),
87 [PCAN_USBPRO_TXMSG4] = sizeof(struct pcan_usb_pro_txmsg) - 4,
88 [PCAN_USBPRO_TXMSG0] = sizeof(struct pcan_usb_pro_txmsg) - 8,
89 };
90
91 /*
92 * initialize PCAN-USB Pro message data structure
93 */
pcan_msg_init(struct pcan_usb_pro_msg * pm,void * buffer_addr,int buffer_size)94 static u8 *pcan_msg_init(struct pcan_usb_pro_msg *pm, void *buffer_addr,
95 int buffer_size)
96 {
97 if (buffer_size < PCAN_USBPRO_MSG_HEADER_LEN)
98 return NULL;
99
100 pm->u.rec_buffer = (u8 *)buffer_addr;
101 pm->rec_buffer_size = pm->rec_buffer_len = buffer_size;
102 pm->rec_ptr = pm->u.rec_buffer + PCAN_USBPRO_MSG_HEADER_LEN;
103
104 return pm->rec_ptr;
105 }
106
pcan_msg_init_empty(struct pcan_usb_pro_msg * pm,void * buffer_addr,int buffer_size)107 static u8 *pcan_msg_init_empty(struct pcan_usb_pro_msg *pm,
108 void *buffer_addr, int buffer_size)
109 {
110 u8 *pr = pcan_msg_init(pm, buffer_addr, buffer_size);
111
112 if (pr) {
113 pm->rec_buffer_len = PCAN_USBPRO_MSG_HEADER_LEN;
114 *pm->u.rec_cnt = 0;
115 }
116 return pr;
117 }
118
119 /*
120 * add one record to a message being built
121 */
pcan_msg_add_rec(struct pcan_usb_pro_msg * pm,int id,...)122 static int pcan_msg_add_rec(struct pcan_usb_pro_msg *pm, int id, ...)
123 {
124 int len, i;
125 u8 *pc;
126 va_list ap;
127
128 va_start(ap, id);
129
130 pc = pm->rec_ptr + 1;
131
132 i = 0;
133 switch (id) {
134 case PCAN_USBPRO_TXMSG8:
135 i += 4;
136 fallthrough;
137 case PCAN_USBPRO_TXMSG4:
138 i += 4;
139 fallthrough;
140 case PCAN_USBPRO_TXMSG0:
141 *pc++ = va_arg(ap, int);
142 *pc++ = va_arg(ap, int);
143 *pc++ = va_arg(ap, int);
144 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
145 pc += 4;
146 memcpy(pc, va_arg(ap, int *), i);
147 pc += i;
148 break;
149
150 case PCAN_USBPRO_SETBTR:
151 case PCAN_USBPRO_GETDEVID:
152 *pc++ = va_arg(ap, int);
153 pc += 2;
154 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
155 pc += 4;
156 break;
157
158 case PCAN_USBPRO_SETFILTR:
159 case PCAN_USBPRO_SETBUSACT:
160 case PCAN_USBPRO_SETSILENT:
161 *pc++ = va_arg(ap, int);
162 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
163 pc += 2;
164 break;
165
166 case PCAN_USBPRO_SETLED:
167 *pc++ = va_arg(ap, int);
168 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
169 pc += 2;
170 *(__le32 *)pc = cpu_to_le32(va_arg(ap, u32));
171 pc += 4;
172 break;
173
174 case PCAN_USBPRO_SETTS:
175 pc++;
176 *(__le16 *)pc = cpu_to_le16(va_arg(ap, int));
177 pc += 2;
178 break;
179
180 default:
181 pr_err("%s: %s(): unknown data type %02Xh (%d)\n",
182 PCAN_USB_DRIVER_NAME, __func__, id, id);
183 pc--;
184 break;
185 }
186
187 len = pc - pm->rec_ptr;
188 if (len > 0) {
189 le32_add_cpu(pm->u.rec_cnt, 1);
190 *pm->rec_ptr = id;
191
192 pm->rec_ptr = pc;
193 pm->rec_buffer_len += len;
194 }
195
196 va_end(ap);
197
198 return len;
199 }
200
201 /*
202 * send PCAN-USB Pro command synchronously
203 */
pcan_usb_pro_send_cmd(struct peak_usb_device * dev,struct pcan_usb_pro_msg * pum)204 static int pcan_usb_pro_send_cmd(struct peak_usb_device *dev,
205 struct pcan_usb_pro_msg *pum)
206 {
207 int actual_length;
208 int err;
209
210 /* usb device unregistered? */
211 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
212 return 0;
213
214 err = usb_bulk_msg(dev->udev,
215 usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
216 pum->u.rec_buffer, pum->rec_buffer_len,
217 &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
218 if (err)
219 netdev_err(dev->netdev, "sending command failure: %d\n", err);
220
221 return err;
222 }
223
224 /*
225 * wait for PCAN-USB Pro command response
226 */
pcan_usb_pro_wait_rsp(struct peak_usb_device * dev,struct pcan_usb_pro_msg * pum)227 static int pcan_usb_pro_wait_rsp(struct peak_usb_device *dev,
228 struct pcan_usb_pro_msg *pum)
229 {
230 u8 req_data_type, req_channel;
231 int actual_length;
232 int i, err = 0;
233
234 /* usb device unregistered? */
235 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
236 return 0;
237
238 req_data_type = pum->u.rec_buffer[4];
239 req_channel = pum->u.rec_buffer[5];
240
241 *pum->u.rec_cnt = 0;
242 for (i = 0; !err && i < PCAN_USBPRO_RSP_SUBMIT_MAX; i++) {
243 struct pcan_usb_pro_msg rsp;
244 union pcan_usb_pro_rec *pr;
245 u32 r, rec_cnt;
246 u16 rec_len;
247 u8 *pc;
248
249 err = usb_bulk_msg(dev->udev,
250 usb_rcvbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDIN),
251 pum->u.rec_buffer, pum->rec_buffer_len,
252 &actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
253 if (err) {
254 netdev_err(dev->netdev, "waiting rsp error %d\n", err);
255 break;
256 }
257
258 if (actual_length == 0)
259 continue;
260
261 err = -EBADMSG;
262 if (actual_length < PCAN_USBPRO_MSG_HEADER_LEN) {
263 netdev_err(dev->netdev,
264 "got abnormal too small rsp (len=%d)\n",
265 actual_length);
266 break;
267 }
268
269 pc = pcan_msg_init(&rsp, pum->u.rec_buffer,
270 actual_length);
271
272 rec_cnt = le32_to_cpu(*rsp.u.rec_cnt);
273
274 /* loop on records stored into message */
275 for (r = 0; r < rec_cnt; r++) {
276 pr = (union pcan_usb_pro_rec *)pc;
277 rec_len = pcan_usb_pro_sizeof_rec[pr->data_type];
278 if (!rec_len) {
279 netdev_err(dev->netdev,
280 "got unprocessed record in msg\n");
281 pcan_dump_mem("rcvd rsp msg", pum->u.rec_buffer,
282 actual_length);
283 break;
284 }
285
286 /* check if response corresponds to request */
287 if (pr->data_type != req_data_type)
288 netdev_err(dev->netdev,
289 "got unwanted rsp %xh: ignored\n",
290 pr->data_type);
291
292 /* check if channel in response corresponds too */
293 else if ((req_channel != 0xff) && \
294 (pr->bus_act.channel != req_channel))
295 netdev_err(dev->netdev,
296 "got rsp %xh but on chan%u: ignored\n",
297 req_data_type, pr->bus_act.channel);
298
299 /* got the response */
300 else
301 return 0;
302
303 /* otherwise, go on with next record in message */
304 pc += rec_len;
305 }
306 }
307
308 return (i >= PCAN_USBPRO_RSP_SUBMIT_MAX) ? -ERANGE : err;
309 }
310
pcan_usb_pro_send_req(struct peak_usb_device * dev,int req_id,int req_value,void * req_addr,int req_size)311 int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id,
312 int req_value, void *req_addr, int req_size)
313 {
314 int err;
315 u8 req_type;
316 unsigned int p;
317
318 /* usb device unregistered? */
319 if (!(dev->state & PCAN_USB_STATE_CONNECTED))
320 return 0;
321
322 req_type = USB_TYPE_VENDOR | USB_RECIP_OTHER;
323
324 switch (req_id) {
325 case PCAN_USBPRO_REQ_FCT:
326 p = usb_sndctrlpipe(dev->udev, 0);
327 break;
328
329 default:
330 p = usb_rcvctrlpipe(dev->udev, 0);
331 req_type |= USB_DIR_IN;
332 memset(req_addr, '\0', req_size);
333 break;
334 }
335
336 err = usb_control_msg(dev->udev, p, req_id, req_type, req_value, 0,
337 req_addr, req_size, 2 * USB_CTRL_GET_TIMEOUT);
338 if (err < 0) {
339 netdev_info(dev->netdev,
340 "unable to request usb[type=%d value=%d] err=%d\n",
341 req_id, req_value, err);
342 return err;
343 }
344
345 return 0;
346 }
347
pcan_usb_pro_set_ts(struct peak_usb_device * dev,u16 onoff)348 static int pcan_usb_pro_set_ts(struct peak_usb_device *dev, u16 onoff)
349 {
350 struct pcan_usb_pro_msg um;
351
352 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
353 pcan_msg_add_rec(&um, PCAN_USBPRO_SETTS, onoff);
354
355 return pcan_usb_pro_send_cmd(dev, &um);
356 }
357
pcan_usb_pro_set_bitrate(struct peak_usb_device * dev,u32 ccbt)358 static int pcan_usb_pro_set_bitrate(struct peak_usb_device *dev, u32 ccbt)
359 {
360 struct pcan_usb_pro_device *pdev =
361 container_of(dev, struct pcan_usb_pro_device, dev);
362 struct pcan_usb_pro_msg um;
363
364 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
365 pcan_msg_add_rec(&um, PCAN_USBPRO_SETBTR, dev->ctrl_idx, ccbt);
366
367 /* cache the CCBT value to reuse it before next buson */
368 pdev->cached_ccbt = ccbt;
369
370 return pcan_usb_pro_send_cmd(dev, &um);
371 }
372
pcan_usb_pro_set_bus(struct peak_usb_device * dev,u8 onoff)373 static int pcan_usb_pro_set_bus(struct peak_usb_device *dev, u8 onoff)
374 {
375 struct pcan_usb_pro_msg um;
376
377 /* if bus=on, be sure the bitrate being set before! */
378 if (onoff) {
379 struct pcan_usb_pro_device *pdev =
380 container_of(dev, struct pcan_usb_pro_device, dev);
381
382 pcan_usb_pro_set_bitrate(dev, pdev->cached_ccbt);
383 }
384
385 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
386 pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, onoff);
387
388 return pcan_usb_pro_send_cmd(dev, &um);
389 }
390
pcan_usb_pro_set_silent(struct peak_usb_device * dev,u8 onoff)391 static int pcan_usb_pro_set_silent(struct peak_usb_device *dev, u8 onoff)
392 {
393 struct pcan_usb_pro_msg um;
394
395 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
396 pcan_msg_add_rec(&um, PCAN_USBPRO_SETSILENT, dev->ctrl_idx, onoff);
397
398 return pcan_usb_pro_send_cmd(dev, &um);
399 }
400
pcan_usb_pro_set_filter(struct peak_usb_device * dev,u16 filter_mode)401 static int pcan_usb_pro_set_filter(struct peak_usb_device *dev, u16 filter_mode)
402 {
403 struct pcan_usb_pro_msg um;
404
405 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
406 pcan_msg_add_rec(&um, PCAN_USBPRO_SETFILTR, dev->ctrl_idx, filter_mode);
407
408 return pcan_usb_pro_send_cmd(dev, &um);
409 }
410
pcan_usb_pro_set_led(struct peak_usb_device * dev,u8 mode,u32 timeout)411 static int pcan_usb_pro_set_led(struct peak_usb_device *dev, u8 mode,
412 u32 timeout)
413 {
414 struct pcan_usb_pro_msg um;
415
416 pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
417 pcan_msg_add_rec(&um, PCAN_USBPRO_SETLED, dev->ctrl_idx, mode, timeout);
418
419 return pcan_usb_pro_send_cmd(dev, &um);
420 }
421
pcan_usb_pro_get_device_id(struct peak_usb_device * dev,u32 * device_id)422 static int pcan_usb_pro_get_device_id(struct peak_usb_device *dev,
423 u32 *device_id)
424 {
425 struct pcan_usb_pro_devid *pdn;
426 struct pcan_usb_pro_msg um;
427 int err;
428 u8 *pc;
429
430 pc = pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
431 pcan_msg_add_rec(&um, PCAN_USBPRO_GETDEVID, dev->ctrl_idx);
432
433 err = pcan_usb_pro_send_cmd(dev, &um);
434 if (err)
435 return err;
436
437 err = pcan_usb_pro_wait_rsp(dev, &um);
438 if (err)
439 return err;
440
441 pdn = (struct pcan_usb_pro_devid *)pc;
442 if (device_id)
443 *device_id = le32_to_cpu(pdn->serial_num);
444
445 return err;
446 }
447
pcan_usb_pro_set_bittiming(struct peak_usb_device * dev,struct can_bittiming * bt)448 static int pcan_usb_pro_set_bittiming(struct peak_usb_device *dev,
449 struct can_bittiming *bt)
450 {
451 u32 ccbt;
452
453 ccbt = (dev->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 0x00800000 : 0;
454 ccbt |= (bt->sjw - 1) << 24;
455 ccbt |= (bt->phase_seg2 - 1) << 20;
456 ccbt |= (bt->prop_seg + bt->phase_seg1 - 1) << 16; /* = tseg1 */
457 ccbt |= bt->brp - 1;
458
459 netdev_info(dev->netdev, "setting ccbt=0x%08x\n", ccbt);
460
461 return pcan_usb_pro_set_bitrate(dev, ccbt);
462 }
463
pcan_usb_pro_restart_complete(struct urb * urb)464 void pcan_usb_pro_restart_complete(struct urb *urb)
465 {
466 /* can delete usb resources */
467 peak_usb_async_complete(urb);
468
469 /* notify candev and netdev */
470 peak_usb_restart_complete(urb->context);
471 }
472
473 /*
474 * handle restart but in asynchronously way
475 */
pcan_usb_pro_restart_async(struct peak_usb_device * dev,struct urb * urb,u8 * buf)476 static int pcan_usb_pro_restart_async(struct peak_usb_device *dev,
477 struct urb *urb, u8 *buf)
478 {
479 struct pcan_usb_pro_msg um;
480
481 pcan_msg_init_empty(&um, buf, PCAN_USB_MAX_CMD_LEN);
482 pcan_msg_add_rec(&um, PCAN_USBPRO_SETBUSACT, dev->ctrl_idx, 1);
483
484 usb_fill_bulk_urb(urb, dev->udev,
485 usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
486 buf, PCAN_USB_MAX_CMD_LEN,
487 pcan_usb_pro_restart_complete, dev);
488
489 return usb_submit_urb(urb, GFP_ATOMIC);
490 }
491
pcan_usb_pro_drv_loaded(struct peak_usb_device * dev,int loaded)492 static int pcan_usb_pro_drv_loaded(struct peak_usb_device *dev, int loaded)
493 {
494 u8 *buffer;
495 int err;
496
497 buffer = kzalloc(PCAN_USBPRO_FCT_DRVLD_REQ_LEN, GFP_KERNEL);
498 if (!buffer)
499 return -ENOMEM;
500
501 buffer[0] = 0;
502 buffer[1] = !!loaded;
503
504 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_FCT,
505 PCAN_USBPRO_FCT_DRVLD, buffer,
506 PCAN_USBPRO_FCT_DRVLD_REQ_LEN);
507 kfree(buffer);
508
509 return err;
510 }
511
512 static inline
pcan_usb_pro_dev_if(struct peak_usb_device * dev)513 struct pcan_usb_pro_interface *pcan_usb_pro_dev_if(struct peak_usb_device *dev)
514 {
515 struct pcan_usb_pro_device *pdev =
516 container_of(dev, struct pcan_usb_pro_device, dev);
517 return pdev->usb_if;
518 }
519
pcan_usb_pro_handle_canmsg(struct pcan_usb_pro_interface * usb_if,struct pcan_usb_pro_rxmsg * rx)520 static int pcan_usb_pro_handle_canmsg(struct pcan_usb_pro_interface *usb_if,
521 struct pcan_usb_pro_rxmsg *rx)
522 {
523 const unsigned int ctrl_idx = (rx->len >> 4) & 0x0f;
524 struct peak_usb_device *dev = usb_if->dev[ctrl_idx];
525 struct net_device *netdev = dev->netdev;
526 struct can_frame *can_frame;
527 struct sk_buff *skb;
528 struct skb_shared_hwtstamps *hwts;
529
530 skb = alloc_can_skb(netdev, &can_frame);
531 if (!skb)
532 return -ENOMEM;
533
534 can_frame->can_id = le32_to_cpu(rx->id);
535 can_frame->can_dlc = rx->len & 0x0f;
536
537 if (rx->flags & PCAN_USBPRO_EXT)
538 can_frame->can_id |= CAN_EFF_FLAG;
539
540 if (rx->flags & PCAN_USBPRO_RTR)
541 can_frame->can_id |= CAN_RTR_FLAG;
542 else
543 memcpy(can_frame->data, rx->data, can_frame->can_dlc);
544
545 hwts = skb_hwtstamps(skb);
546 peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(rx->ts32),
547 &hwts->hwtstamp);
548
549 netdev->stats.rx_packets++;
550 netdev->stats.rx_bytes += can_frame->can_dlc;
551 netif_rx(skb);
552
553 return 0;
554 }
555
pcan_usb_pro_handle_error(struct pcan_usb_pro_interface * usb_if,struct pcan_usb_pro_rxstatus * er)556 static int pcan_usb_pro_handle_error(struct pcan_usb_pro_interface *usb_if,
557 struct pcan_usb_pro_rxstatus *er)
558 {
559 const u16 raw_status = le16_to_cpu(er->status);
560 const unsigned int ctrl_idx = (er->channel >> 4) & 0x0f;
561 struct peak_usb_device *dev = usb_if->dev[ctrl_idx];
562 struct net_device *netdev = dev->netdev;
563 struct can_frame *can_frame;
564 enum can_state new_state = CAN_STATE_ERROR_ACTIVE;
565 u8 err_mask = 0;
566 struct sk_buff *skb;
567 struct skb_shared_hwtstamps *hwts;
568
569 /* nothing should be sent while in BUS_OFF state */
570 if (dev->can.state == CAN_STATE_BUS_OFF)
571 return 0;
572
573 if (!raw_status) {
574 /* no error bit (back to active state) */
575 dev->can.state = CAN_STATE_ERROR_ACTIVE;
576 return 0;
577 }
578
579 if (raw_status & (PCAN_USBPRO_STATUS_OVERRUN |
580 PCAN_USBPRO_STATUS_QOVERRUN)) {
581 /* trick to bypass next comparison and process other errors */
582 new_state = CAN_STATE_MAX;
583 }
584
585 if (raw_status & PCAN_USBPRO_STATUS_BUS) {
586 new_state = CAN_STATE_BUS_OFF;
587 } else if (raw_status & PCAN_USBPRO_STATUS_ERROR) {
588 u32 rx_err_cnt = (le32_to_cpu(er->err_frm) & 0x00ff0000) >> 16;
589 u32 tx_err_cnt = (le32_to_cpu(er->err_frm) & 0xff000000) >> 24;
590
591 if (rx_err_cnt > 127)
592 err_mask |= CAN_ERR_CRTL_RX_PASSIVE;
593 else if (rx_err_cnt > 96)
594 err_mask |= CAN_ERR_CRTL_RX_WARNING;
595
596 if (tx_err_cnt > 127)
597 err_mask |= CAN_ERR_CRTL_TX_PASSIVE;
598 else if (tx_err_cnt > 96)
599 err_mask |= CAN_ERR_CRTL_TX_WARNING;
600
601 if (err_mask & (CAN_ERR_CRTL_RX_WARNING |
602 CAN_ERR_CRTL_TX_WARNING))
603 new_state = CAN_STATE_ERROR_WARNING;
604 else if (err_mask & (CAN_ERR_CRTL_RX_PASSIVE |
605 CAN_ERR_CRTL_TX_PASSIVE))
606 new_state = CAN_STATE_ERROR_PASSIVE;
607 }
608
609 /* donot post any error if current state didn't change */
610 if (dev->can.state == new_state)
611 return 0;
612
613 /* allocate an skb to store the error frame */
614 skb = alloc_can_err_skb(netdev, &can_frame);
615 if (!skb)
616 return -ENOMEM;
617
618 switch (new_state) {
619 case CAN_STATE_BUS_OFF:
620 can_frame->can_id |= CAN_ERR_BUSOFF;
621 dev->can.can_stats.bus_off++;
622 can_bus_off(netdev);
623 break;
624
625 case CAN_STATE_ERROR_PASSIVE:
626 can_frame->can_id |= CAN_ERR_CRTL;
627 can_frame->data[1] |= err_mask;
628 dev->can.can_stats.error_passive++;
629 break;
630
631 case CAN_STATE_ERROR_WARNING:
632 can_frame->can_id |= CAN_ERR_CRTL;
633 can_frame->data[1] |= err_mask;
634 dev->can.can_stats.error_warning++;
635 break;
636
637 case CAN_STATE_ERROR_ACTIVE:
638 break;
639
640 default:
641 /* CAN_STATE_MAX (trick to handle other errors) */
642 if (raw_status & PCAN_USBPRO_STATUS_OVERRUN) {
643 can_frame->can_id |= CAN_ERR_PROT;
644 can_frame->data[2] |= CAN_ERR_PROT_OVERLOAD;
645 netdev->stats.rx_over_errors++;
646 netdev->stats.rx_errors++;
647 }
648
649 if (raw_status & PCAN_USBPRO_STATUS_QOVERRUN) {
650 can_frame->can_id |= CAN_ERR_CRTL;
651 can_frame->data[1] |= CAN_ERR_CRTL_RX_OVERFLOW;
652 netdev->stats.rx_over_errors++;
653 netdev->stats.rx_errors++;
654 }
655
656 new_state = CAN_STATE_ERROR_ACTIVE;
657 break;
658 }
659
660 dev->can.state = new_state;
661
662 hwts = skb_hwtstamps(skb);
663 peak_usb_get_ts_time(&usb_if->time_ref, le32_to_cpu(er->ts32), &hwts->hwtstamp);
664 netdev->stats.rx_packets++;
665 netdev->stats.rx_bytes += can_frame->can_dlc;
666 netif_rx(skb);
667
668 return 0;
669 }
670
pcan_usb_pro_handle_ts(struct pcan_usb_pro_interface * usb_if,struct pcan_usb_pro_rxts * ts)671 static void pcan_usb_pro_handle_ts(struct pcan_usb_pro_interface *usb_if,
672 struct pcan_usb_pro_rxts *ts)
673 {
674 /* should wait until clock is stabilized */
675 if (usb_if->cm_ignore_count > 0)
676 usb_if->cm_ignore_count--;
677 else
678 peak_usb_set_ts_now(&usb_if->time_ref,
679 le32_to_cpu(ts->ts64[1]));
680 }
681
682 /*
683 * callback for bulk IN urb
684 */
pcan_usb_pro_decode_buf(struct peak_usb_device * dev,struct urb * urb)685 static int pcan_usb_pro_decode_buf(struct peak_usb_device *dev, struct urb *urb)
686 {
687 struct pcan_usb_pro_interface *usb_if = pcan_usb_pro_dev_if(dev);
688 struct net_device *netdev = dev->netdev;
689 struct pcan_usb_pro_msg usb_msg;
690 u8 *rec_ptr, *msg_end;
691 u16 rec_cnt;
692 int err = 0;
693
694 rec_ptr = pcan_msg_init(&usb_msg, urb->transfer_buffer,
695 urb->actual_length);
696 if (!rec_ptr) {
697 netdev_err(netdev, "bad msg hdr len %d\n", urb->actual_length);
698 return -EINVAL;
699 }
700
701 /* loop reading all the records from the incoming message */
702 msg_end = urb->transfer_buffer + urb->actual_length;
703 rec_cnt = le16_to_cpu(*usb_msg.u.rec_cnt_rd);
704 for (; rec_cnt > 0; rec_cnt--) {
705 union pcan_usb_pro_rec *pr = (union pcan_usb_pro_rec *)rec_ptr;
706 u16 sizeof_rec = pcan_usb_pro_sizeof_rec[pr->data_type];
707
708 if (!sizeof_rec) {
709 netdev_err(netdev,
710 "got unsupported rec in usb msg:\n");
711 err = -ENOTSUPP;
712 break;
713 }
714
715 /* check if the record goes out of current packet */
716 if (rec_ptr + sizeof_rec > msg_end) {
717 netdev_err(netdev,
718 "got frag rec: should inc usb rx buf size\n");
719 err = -EBADMSG;
720 break;
721 }
722
723 switch (pr->data_type) {
724 case PCAN_USBPRO_RXMSG8:
725 case PCAN_USBPRO_RXMSG4:
726 case PCAN_USBPRO_RXMSG0:
727 case PCAN_USBPRO_RXRTR:
728 err = pcan_usb_pro_handle_canmsg(usb_if, &pr->rx_msg);
729 if (err < 0)
730 goto fail;
731 break;
732
733 case PCAN_USBPRO_RXSTATUS:
734 err = pcan_usb_pro_handle_error(usb_if, &pr->rx_status);
735 if (err < 0)
736 goto fail;
737 break;
738
739 case PCAN_USBPRO_RXTS:
740 pcan_usb_pro_handle_ts(usb_if, &pr->rx_ts);
741 break;
742
743 default:
744 netdev_err(netdev,
745 "unhandled rec type 0x%02x (%d): ignored\n",
746 pr->data_type, pr->data_type);
747 break;
748 }
749
750 rec_ptr += sizeof_rec;
751 }
752
753 fail:
754 if (err)
755 pcan_dump_mem("received msg",
756 urb->transfer_buffer, urb->actual_length);
757
758 return err;
759 }
760
pcan_usb_pro_encode_msg(struct peak_usb_device * dev,struct sk_buff * skb,u8 * obuf,size_t * size)761 static int pcan_usb_pro_encode_msg(struct peak_usb_device *dev,
762 struct sk_buff *skb, u8 *obuf, size_t *size)
763 {
764 struct can_frame *cf = (struct can_frame *)skb->data;
765 u8 data_type, len, flags;
766 struct pcan_usb_pro_msg usb_msg;
767
768 pcan_msg_init_empty(&usb_msg, obuf, *size);
769
770 if ((cf->can_id & CAN_RTR_FLAG) || (cf->can_dlc == 0))
771 data_type = PCAN_USBPRO_TXMSG0;
772 else if (cf->can_dlc <= 4)
773 data_type = PCAN_USBPRO_TXMSG4;
774 else
775 data_type = PCAN_USBPRO_TXMSG8;
776
777 len = (dev->ctrl_idx << 4) | (cf->can_dlc & 0x0f);
778
779 flags = 0;
780 if (cf->can_id & CAN_EFF_FLAG)
781 flags |= 0x02;
782 if (cf->can_id & CAN_RTR_FLAG)
783 flags |= 0x01;
784
785 pcan_msg_add_rec(&usb_msg, data_type, 0, flags, len, cf->can_id,
786 cf->data);
787
788 *size = usb_msg.rec_buffer_len;
789
790 return 0;
791 }
792
pcan_usb_pro_start(struct peak_usb_device * dev)793 static int pcan_usb_pro_start(struct peak_usb_device *dev)
794 {
795 struct pcan_usb_pro_device *pdev =
796 container_of(dev, struct pcan_usb_pro_device, dev);
797 int err;
798
799 err = pcan_usb_pro_set_silent(dev,
800 dev->can.ctrlmode & CAN_CTRLMODE_LISTENONLY);
801 if (err)
802 return err;
803
804 /* filter mode: 0-> All OFF; 1->bypass */
805 err = pcan_usb_pro_set_filter(dev, 1);
806 if (err)
807 return err;
808
809 /* opening first device: */
810 if (pdev->usb_if->dev_opened_count == 0) {
811 /* reset time_ref */
812 peak_usb_init_time_ref(&pdev->usb_if->time_ref, &pcan_usb_pro);
813
814 /* ask device to send ts messages */
815 err = pcan_usb_pro_set_ts(dev, 1);
816 }
817
818 pdev->usb_if->dev_opened_count++;
819
820 return err;
821 }
822
823 /*
824 * stop interface
825 * (last chance before set bus off)
826 */
pcan_usb_pro_stop(struct peak_usb_device * dev)827 static int pcan_usb_pro_stop(struct peak_usb_device *dev)
828 {
829 struct pcan_usb_pro_device *pdev =
830 container_of(dev, struct pcan_usb_pro_device, dev);
831
832 /* turn off ts msgs for that interface if no other dev opened */
833 if (pdev->usb_if->dev_opened_count == 1)
834 pcan_usb_pro_set_ts(dev, 0);
835
836 pdev->usb_if->dev_opened_count--;
837
838 return 0;
839 }
840
841 /*
842 * called when probing to initialize a device object.
843 */
pcan_usb_pro_init(struct peak_usb_device * dev)844 static int pcan_usb_pro_init(struct peak_usb_device *dev)
845 {
846 struct pcan_usb_pro_device *pdev =
847 container_of(dev, struct pcan_usb_pro_device, dev);
848 struct pcan_usb_pro_interface *usb_if = NULL;
849 struct pcan_usb_pro_fwinfo *fi = NULL;
850 struct pcan_usb_pro_blinfo *bi = NULL;
851 int err;
852
853 /* do this for 1st channel only */
854 if (!dev->prev_siblings) {
855 /* allocate netdevices common structure attached to first one */
856 usb_if = kzalloc(sizeof(struct pcan_usb_pro_interface),
857 GFP_KERNEL);
858 fi = kmalloc(sizeof(struct pcan_usb_pro_fwinfo), GFP_KERNEL);
859 bi = kmalloc(sizeof(struct pcan_usb_pro_blinfo), GFP_KERNEL);
860 if (!usb_if || !fi || !bi) {
861 err = -ENOMEM;
862 goto err_out;
863 }
864
865 /* number of ts msgs to ignore before taking one into account */
866 usb_if->cm_ignore_count = 5;
867
868 /*
869 * explicit use of dev_xxx() instead of netdev_xxx() here:
870 * information displayed are related to the device itself, not
871 * to the canx netdevices.
872 */
873 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
874 PCAN_USBPRO_INFO_FW,
875 fi, sizeof(*fi));
876 if (err) {
877 dev_err(dev->netdev->dev.parent,
878 "unable to read %s firmware info (err %d)\n",
879 pcan_usb_pro.name, err);
880 goto err_out;
881 }
882
883 err = pcan_usb_pro_send_req(dev, PCAN_USBPRO_REQ_INFO,
884 PCAN_USBPRO_INFO_BL,
885 bi, sizeof(*bi));
886 if (err) {
887 dev_err(dev->netdev->dev.parent,
888 "unable to read %s bootloader info (err %d)\n",
889 pcan_usb_pro.name, err);
890 goto err_out;
891 }
892
893 /* tell the device the can driver is running */
894 err = pcan_usb_pro_drv_loaded(dev, 1);
895 if (err)
896 goto err_out;
897
898 dev_info(dev->netdev->dev.parent,
899 "PEAK-System %s hwrev %u serial %08X.%08X (%u channels)\n",
900 pcan_usb_pro.name,
901 bi->hw_rev, bi->serial_num_hi, bi->serial_num_lo,
902 pcan_usb_pro.ctrl_count);
903 } else {
904 usb_if = pcan_usb_pro_dev_if(dev->prev_siblings);
905 }
906
907 pdev->usb_if = usb_if;
908 usb_if->dev[dev->ctrl_idx] = dev;
909
910 /* set LED in default state (end of init phase) */
911 pcan_usb_pro_set_led(dev, 0, 1);
912
913 kfree(bi);
914 kfree(fi);
915
916 return 0;
917
918 err_out:
919 kfree(bi);
920 kfree(fi);
921 kfree(usb_if);
922
923 return err;
924 }
925
pcan_usb_pro_exit(struct peak_usb_device * dev)926 static void pcan_usb_pro_exit(struct peak_usb_device *dev)
927 {
928 struct pcan_usb_pro_device *pdev =
929 container_of(dev, struct pcan_usb_pro_device, dev);
930
931 /*
932 * when rmmod called before unplug and if down, should reset things
933 * before leaving
934 */
935 if (dev->can.state != CAN_STATE_STOPPED) {
936 /* set bus off on the corresponding channel */
937 pcan_usb_pro_set_bus(dev, 0);
938 }
939
940 /* if channel #0 (only) */
941 if (dev->ctrl_idx == 0) {
942 /* turn off calibration message if any device were opened */
943 if (pdev->usb_if->dev_opened_count > 0)
944 pcan_usb_pro_set_ts(dev, 0);
945
946 /* tell the PCAN-USB Pro device the driver is being unloaded */
947 pcan_usb_pro_drv_loaded(dev, 0);
948 }
949 }
950
951 /*
952 * called when PCAN-USB Pro adapter is unplugged
953 */
pcan_usb_pro_free(struct peak_usb_device * dev)954 static void pcan_usb_pro_free(struct peak_usb_device *dev)
955 {
956 /* last device: can free pcan_usb_pro_interface object now */
957 if (!dev->prev_siblings && !dev->next_siblings)
958 kfree(pcan_usb_pro_dev_if(dev));
959 }
960
961 /*
962 * probe function for new PCAN-USB Pro usb interface
963 */
pcan_usb_pro_probe(struct usb_interface * intf)964 int pcan_usb_pro_probe(struct usb_interface *intf)
965 {
966 struct usb_host_interface *if_desc;
967 int i;
968
969 if_desc = intf->altsetting;
970
971 /* check interface endpoint addresses */
972 for (i = 0; i < if_desc->desc.bNumEndpoints; i++) {
973 struct usb_endpoint_descriptor *ep = &if_desc->endpoint[i].desc;
974
975 /*
976 * below is the list of valid ep addresses. Any other ep address
977 * is considered as not-CAN interface address => no dev created
978 */
979 switch (ep->bEndpointAddress) {
980 case PCAN_USBPRO_EP_CMDOUT:
981 case PCAN_USBPRO_EP_CMDIN:
982 case PCAN_USBPRO_EP_MSGOUT_0:
983 case PCAN_USBPRO_EP_MSGOUT_1:
984 case PCAN_USBPRO_EP_MSGIN:
985 case PCAN_USBPRO_EP_UNUSED:
986 break;
987 default:
988 return -ENODEV;
989 }
990 }
991
992 return 0;
993 }
994
995 /*
996 * describe the PCAN-USB Pro adapter
997 */
998 static const struct can_bittiming_const pcan_usb_pro_const = {
999 .name = "pcan_usb_pro",
1000 .tseg1_min = 1,
1001 .tseg1_max = 16,
1002 .tseg2_min = 1,
1003 .tseg2_max = 8,
1004 .sjw_max = 4,
1005 .brp_min = 1,
1006 .brp_max = 1024,
1007 .brp_inc = 1,
1008 };
1009
1010 const struct peak_usb_adapter pcan_usb_pro = {
1011 .name = "PCAN-USB Pro",
1012 .device_id = PCAN_USBPRO_PRODUCT_ID,
1013 .ctrl_count = PCAN_USBPRO_CHANNEL_COUNT,
1014 .ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES | CAN_CTRLMODE_LISTENONLY,
1015 .clock = {
1016 .freq = PCAN_USBPRO_CRYSTAL_HZ,
1017 },
1018 .bittiming_const = &pcan_usb_pro_const,
1019
1020 /* size of device private data */
1021 .sizeof_dev_private = sizeof(struct pcan_usb_pro_device),
1022
1023 /* timestamps usage */
1024 .ts_used_bits = 32,
1025 .ts_period = 1000000, /* calibration period in ts. */
1026 .us_per_ts_scale = 1, /* us = (ts * scale) >> shift */
1027 .us_per_ts_shift = 0,
1028
1029 /* give here messages in/out endpoints */
1030 .ep_msg_in = PCAN_USBPRO_EP_MSGIN,
1031 .ep_msg_out = {PCAN_USBPRO_EP_MSGOUT_0, PCAN_USBPRO_EP_MSGOUT_1},
1032
1033 /* size of rx/tx usb buffers */
1034 .rx_buffer_size = PCAN_USBPRO_RX_BUFFER_SIZE,
1035 .tx_buffer_size = PCAN_USBPRO_TX_BUFFER_SIZE,
1036
1037 /* device callbacks */
1038 .intf_probe = pcan_usb_pro_probe,
1039 .dev_init = pcan_usb_pro_init,
1040 .dev_exit = pcan_usb_pro_exit,
1041 .dev_free = pcan_usb_pro_free,
1042 .dev_set_bus = pcan_usb_pro_set_bus,
1043 .dev_set_bittiming = pcan_usb_pro_set_bittiming,
1044 .dev_get_device_id = pcan_usb_pro_get_device_id,
1045 .dev_decode_buf = pcan_usb_pro_decode_buf,
1046 .dev_encode_msg = pcan_usb_pro_encode_msg,
1047 .dev_start = pcan_usb_pro_start,
1048 .dev_stop = pcan_usb_pro_stop,
1049 .dev_restart_async = pcan_usb_pro_restart_async,
1050 };
1051