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netdevice: add helper to update trans_start
[deliverable/linux.git] / drivers / net / can / usb / peak_usb / pcan_usb_core.c
CommitLineData
bb478555
SG		 1/*
2 * CAN driver for PEAK System USB adapters
3 * Derived from the PCAN project file driver/src/pcan_usb_core.c
4 *
5 * Copyright (C) 2003-2010 PEAK System-Technik GmbH
6 * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
7 *
8 * Many thanks to Klaus Hitschler <klaus.hitschler@gmx.de>
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published
12 * by the Free Software Foundation; version 2 of the License.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
18 */
19#include <linux/init.h>
20#include <linux/signal.h>
21#include <linux/slab.h>
22#include <linux/module.h>
23#include <linux/netdevice.h>
24#include <linux/usb.h>
25
26#include <linux/can.h>
27#include <linux/can/dev.h>
28#include <linux/can/error.h>
29
30#include "pcan_usb_core.h"
31
32MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
33MODULE_DESCRIPTION("CAN driver for PEAK-System USB adapters");
34MODULE_LICENSE("GPL v2");
35
36/* Table of devices that work with this driver */
37static struct usb_device_id peak_usb_table[] = {
38 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USB_PRODUCT_ID)},
39 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPRO_PRODUCT_ID)},
0a25e1f4
SG		 40 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBFD_PRODUCT_ID)},
41 {USB_DEVICE(PCAN_USB_VENDOR_ID, PCAN_USBPROFD_PRODUCT_ID)},
bb478555
SG		 42 {} /* Terminating entry */
43};
44
45MODULE_DEVICE_TABLE(usb, peak_usb_table);
46
47/* List of supported PCAN-USB adapters (NULL terminated list) */
d6b5f30d 48static const struct peak_usb_adapter *const peak_usb_adapters_list[] = {
bb478555
SG		 49 &pcan_usb,
50 &pcan_usb_pro,
0a25e1f4
SG		 51 &pcan_usb_fd,
52 &pcan_usb_pro_fd,
bb478555
SG		 53};
54
55/*
56 * dump memory
57 */
58#define DUMP_WIDTH 16
56b9f301 59void pcan_dump_mem(char *prompt, void *p, int l)
bb478555
SG		 60{
61 pr_info("%s dumping %s (%d bytes):\n",
62 PCAN_USB_DRIVER_NAME, prompt ? prompt : "memory", l);
63 print_hex_dump(KERN_INFO, PCAN_USB_DRIVER_NAME " ", DUMP_PREFIX_NONE,
64 DUMP_WIDTH, 1, p, l, false);
65}
66
67/*
68 * initialize a time_ref object with usb adapter own settings
69 */
70void peak_usb_init_time_ref(struct peak_time_ref *time_ref,
d6b5f30d 71 const struct peak_usb_adapter *adapter)
bb478555
SG		 72{
73 if (time_ref) {
74 memset(time_ref, 0, sizeof(struct peak_time_ref));
75 time_ref->adapter = adapter;
76 }
77}
78
79static void peak_usb_add_us(struct timeval *tv, u32 delta_us)
80{
81 /* number of s. to add to final time */
82 u32 delta_s = delta_us / 1000000;
83
84 delta_us -= delta_s * 1000000;
85
86 tv->tv_usec += delta_us;
87 if (tv->tv_usec >= 1000000) {
88 tv->tv_usec -= 1000000;
89 delta_s++;
90 }
91 tv->tv_sec += delta_s;
92}
93
94/*
95 * sometimes, another now may be more recent than current one...
96 */
97void peak_usb_update_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
98{
99 time_ref->ts_dev_2 = ts_now;
100
101 /* should wait at least two passes before computing */
102 if (time_ref->tv_host.tv_sec > 0) {
103 u32 delta_ts = time_ref->ts_dev_2 - time_ref->ts_dev_1;
104
105 if (time_ref->ts_dev_2 < time_ref->ts_dev_1)
106 delta_ts &= (1 << time_ref->adapter->ts_used_bits) - 1;
107
108 time_ref->ts_total += delta_ts;
109 }
110}
111
112/*
113 * register device timestamp as now
114 */
115void peak_usb_set_ts_now(struct peak_time_ref *time_ref, u32 ts_now)
116{
117 if (time_ref->tv_host_0.tv_sec == 0) {
118 /* use monotonic clock to correctly compute further deltas */
119 time_ref->tv_host_0 = ktime_to_timeval(ktime_get());
120 time_ref->tv_host.tv_sec = 0;
121 } else {
122 /*
123 * delta_us should not be >= 2^32 => delta_s should be < 4294
124 * handle 32-bits wrapping here: if count of s. reaches 4200,
125 * reset counters and change time base
126 */
127 if (time_ref->tv_host.tv_sec != 0) {
128 u32 delta_s = time_ref->tv_host.tv_sec
129 - time_ref->tv_host_0.tv_sec;
130 if (delta_s > 4200) {
131 time_ref->tv_host_0 = time_ref->tv_host;
132 time_ref->ts_total = 0;
133 }
134 }
135
136 time_ref->tv_host = ktime_to_timeval(ktime_get());
137 time_ref->tick_count++;
138 }
139
140 time_ref->ts_dev_1 = time_ref->ts_dev_2;
141 peak_usb_update_ts_now(time_ref, ts_now);
142}
143
144/*
145 * compute timeval according to current ts and time_ref data
146 */
147void peak_usb_get_ts_tv(struct peak_time_ref *time_ref, u32 ts,
148 struct timeval *tv)
149{
150 /* protect from getting timeval before setting now */
151 if (time_ref->tv_host.tv_sec > 0) {
152 u64 delta_us;
153
154 delta_us = ts - time_ref->ts_dev_2;
155 if (ts < time_ref->ts_dev_2)
156 delta_us &= (1 << time_ref->adapter->ts_used_bits) - 1;
157
158 delta_us += time_ref->ts_total;
159
160 delta_us *= time_ref->adapter->us_per_ts_scale;
161 delta_us >>= time_ref->adapter->us_per_ts_shift;
162
163 *tv = time_ref->tv_host_0;
164 peak_usb_add_us(tv, (u32)delta_us);
165 } else {
166 *tv = ktime_to_timeval(ktime_get());
167 }
168}
169
faa233d9
SG		 170/*
171 * post received skb after having set any hw timestamp
172 */
173int peak_usb_netif_rx(struct sk_buff *skb,
174 struct peak_time_ref *time_ref, u32 ts_low, u32 ts_high)
175{
176 struct skb_shared_hwtstamps *hwts = skb_hwtstamps(skb);
177 struct timeval tv;
178
179 peak_usb_get_ts_tv(time_ref, ts_low, &tv);
180 hwts->hwtstamp = timeval_to_ktime(tv);
181
182 return netif_rx(skb);
183}
184
bb478555
SG		 185/*
186 * callback for bulk Rx urb
187 */
188static void peak_usb_read_bulk_callback(struct urb *urb)
189{
190 struct peak_usb_device *dev = urb->context;
191 struct net_device *netdev;
192 int err;
193
194 netdev = dev->netdev;
195
196 if (!netif_device_present(netdev))
197 return;
198
199 /* check reception status */
200 switch (urb->status) {
201 case 0:
202 /* success */
203 break;
204
205 case -EILSEQ:
206 case -ENOENT:
207 case -ECONNRESET:
208 case -ESHUTDOWN:
209 return;
210
211 default:
212 if (net_ratelimit())
213 netdev_err(netdev,
214 "Rx urb aborted (%d)\n", urb->status);
215 goto resubmit_urb;
216 }
217
218 /* protect from any incoming empty msgs */
219 if ((urb->actual_length > 0) && (dev->adapter->dev_decode_buf)) {
220 /* handle these kinds of msgs only if _start callback called */
221 if (dev->state & PCAN_USB_STATE_STARTED) {
222 err = dev->adapter->dev_decode_buf(dev, urb);
223 if (err)
56b9f301
RD		 224 pcan_dump_mem("received usb message",
225 urb->transfer_buffer,
226 urb->transfer_buffer_length);
bb478555
SG		 227 }
228 }
229
230resubmit_urb:
231 usb_fill_bulk_urb(urb, dev->udev,
232 usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
233 urb->transfer_buffer, dev->adapter->rx_buffer_size,
234 peak_usb_read_bulk_callback, dev);
235
236 usb_anchor_urb(urb, &dev->rx_submitted);
237 err = usb_submit_urb(urb, GFP_ATOMIC);
238 if (!err)
239 return;
240
241 usb_unanchor_urb(urb);
242
243 if (err == -ENODEV)
244 netif_device_detach(netdev);
245 else
246 netdev_err(netdev, "failed resubmitting read bulk urb: %d\n",
247 err);
248}
249
250/*
251 * callback for bulk Tx urb
252 */
253static void peak_usb_write_bulk_callback(struct urb *urb)
254{
255 struct peak_tx_urb_context *context = urb->context;
256 struct peak_usb_device *dev;
257 struct net_device *netdev;
258
259 BUG_ON(!context);
260
261 dev = context->dev;
262 netdev = dev->netdev;
263
264 atomic_dec(&dev->active_tx_urbs);
265
266 if (!netif_device_present(netdev))
267 return;
268
269 /* check tx status */
270 switch (urb->status) {
271 case 0:
272 /* transmission complete */
273 netdev->stats.tx_packets++;
2b0861e8 274 netdev->stats.tx_bytes += context->data_len;
bb478555
SG		 275
276 /* prevent tx timeout */
277 netdev->trans_start = jiffies;
278 break;
279
280 default:
281 if (net_ratelimit())
282 netdev_err(netdev, "Tx urb aborted (%d)\n",
283 urb->status);
284 case -EPROTO:
285 case -ENOENT:
286 case -ECONNRESET:
287 case -ESHUTDOWN:
288
289 break;
290 }
291
292 /* should always release echo skb and corresponding context */
293 can_get_echo_skb(netdev, context->echo_index);
294 context->echo_index = PCAN_USB_MAX_TX_URBS;
295
296 /* do wakeup tx queue in case of success only */
297 if (!urb->status)
298 netif_wake_queue(netdev);
299}
300
301/*
302 * called by netdev to send one skb on the CAN interface.
303 */
304static netdev_tx_t peak_usb_ndo_start_xmit(struct sk_buff *skb,
305 struct net_device *netdev)
306{
307 struct peak_usb_device *dev = netdev_priv(netdev);
308 struct peak_tx_urb_context *context = NULL;
309 struct net_device_stats *stats = &netdev->stats;
2b0861e8 310 struct canfd_frame *cfd = (struct canfd_frame *)skb->data;
bb478555
SG		 311 struct urb *urb;
312 u8 *obuf;
313 int i, err;
314 size_t size = dev->adapter->tx_buffer_size;
315
316 if (can_dropped_invalid_skb(netdev, skb))
317 return NETDEV_TX_OK;
318
319 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
320 if (dev->tx_contexts[i].echo_index == PCAN_USB_MAX_TX_URBS) {
321 context = dev->tx_contexts + i;
322 break;
323 }
324
325 if (!context) {
326 /* should not occur except during restart */
327 return NETDEV_TX_BUSY;
328 }
329
330 urb = context->urb;
331 obuf = urb->transfer_buffer;
332
333 err = dev->adapter->dev_encode_msg(dev, skb, obuf, &size);
334 if (err) {
335 if (net_ratelimit())
336 netdev_err(netdev, "packet dropped\n");
337 dev_kfree_skb(skb);
338 stats->tx_dropped++;
339 return NETDEV_TX_OK;
340 }
341
342 context->echo_index = i;
2b0861e8
SG		 343
344 /* Note: this works with CANFD frames too */
345 context->data_len = cfd->len;
bb478555
SG		 346
347 usb_anchor_urb(urb, &dev->tx_submitted);
348
349 can_put_echo_skb(skb, netdev, context->echo_index);
350
351 atomic_inc(&dev->active_tx_urbs);
352
353 err = usb_submit_urb(urb, GFP_ATOMIC);
354 if (err) {
355 can_free_echo_skb(netdev, context->echo_index);
356
357 usb_unanchor_urb(urb);
358
359 /* this context is not used in fact */
360 context->echo_index = PCAN_USB_MAX_TX_URBS;
361
362 atomic_dec(&dev->active_tx_urbs);
363
364 switch (err) {
365 case -ENODEV:
366 netif_device_detach(netdev);
367 break;
368 default:
369 netdev_warn(netdev, "tx urb submitting failed err=%d\n",
370 err);
371 case -ENOENT:
372 /* cable unplugged */
373 stats->tx_dropped++;
374 }
375 } else {
376 netdev->trans_start = jiffies;
377
378 /* slow down tx path */
379 if (atomic_read(&dev->active_tx_urbs) >= PCAN_USB_MAX_TX_URBS)
380 netif_stop_queue(netdev);
381 }
382
383 return NETDEV_TX_OK;
384}
385
386/*
387 * start the CAN interface.
388 * Rx and Tx urbs are allocated here. Rx urbs are submitted here.
389 */
390static int peak_usb_start(struct peak_usb_device *dev)
391{
392 struct net_device *netdev = dev->netdev;
393 int err, i;
394
395 for (i = 0; i < PCAN_USB_MAX_RX_URBS; i++) {
396 struct urb *urb;
397 u8 *buf;
398
399 /* create a URB, and a buffer for it, to receive usb messages */
400 urb = usb_alloc_urb(0, GFP_KERNEL);
401 if (!urb) {
402 netdev_err(netdev, "No memory left for URBs\n");
403 err = -ENOMEM;
404 break;
405 }
406
407 buf = kmalloc(dev->adapter->rx_buffer_size, GFP_KERNEL);
408 if (!buf) {
bb478555
SG		 409 usb_free_urb(urb);
410 err = -ENOMEM;
411 break;
412 }
413
414 usb_fill_bulk_urb(urb, dev->udev,
415 usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
416 buf, dev->adapter->rx_buffer_size,
417 peak_usb_read_bulk_callback, dev);
418
419 /* ask last usb_free_urb() to also kfree() transfer_buffer */
420 urb->transfer_flags |= URB_FREE_BUFFER;
421 usb_anchor_urb(urb, &dev->rx_submitted);
422
423 err = usb_submit_urb(urb, GFP_KERNEL);
424 if (err) {
425 if (err == -ENODEV)
426 netif_device_detach(dev->netdev);
427
428 usb_unanchor_urb(urb);
429 kfree(buf);
430 usb_free_urb(urb);
431 break;
432 }
433
434 /* drop reference, USB core will take care of freeing it */
435 usb_free_urb(urb);
436 }
437
438 /* did we submit any URBs? Warn if we was not able to submit all urbs */
439 if (i < PCAN_USB_MAX_RX_URBS) {
440 if (i == 0) {
441 netdev_err(netdev, "couldn't setup any rx URB\n");
442 return err;
443 }
444
445 netdev_warn(netdev, "rx performance may be slow\n");
446 }
447
448 /* pre-alloc tx buffers and corresponding urbs */
449 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
450 struct peak_tx_urb_context *context;
451 struct urb *urb;
452 u8 *buf;
453
454 /* create a URB and a buffer for it, to transmit usb messages */
455 urb = usb_alloc_urb(0, GFP_KERNEL);
456 if (!urb) {
457 netdev_err(netdev, "No memory left for URBs\n");
458 err = -ENOMEM;
459 break;
460 }
461
462 buf = kmalloc(dev->adapter->tx_buffer_size, GFP_KERNEL);
463 if (!buf) {
bb478555
SG		 464 usb_free_urb(urb);
465 err = -ENOMEM;
466 break;
467 }
468
469 context = dev->tx_contexts + i;
470 context->dev = dev;
471 context->urb = urb;
472
473 usb_fill_bulk_urb(urb, dev->udev,
474 usb_sndbulkpipe(dev->udev, dev->ep_msg_out),
475 buf, dev->adapter->tx_buffer_size,
476 peak_usb_write_bulk_callback, context);
477
478 /* ask last usb_free_urb() to also kfree() transfer_buffer */
479 urb->transfer_flags |= URB_FREE_BUFFER;
480 }
481
482 /* warn if we were not able to allocate enough tx contexts */
483 if (i < PCAN_USB_MAX_TX_URBS) {
484 if (i == 0) {
485 netdev_err(netdev, "couldn't setup any tx URB\n");
f37d6e70 486 goto err_tx;
bb478555
SG		 487 }
488
489 netdev_warn(netdev, "tx performance may be slow\n");
490 }
491
492 if (dev->adapter->dev_start) {
493 err = dev->adapter->dev_start(dev);
494 if (err)
f37d6e70 495 goto err_adapter;
bb478555
SG		 496 }
497
498 dev->state |= PCAN_USB_STATE_STARTED;
499
500 /* can set bus on now */
501 if (dev->adapter->dev_set_bus) {
502 err = dev->adapter->dev_set_bus(dev, 1);
503 if (err)
f37d6e70 504 goto err_adapter;
bb478555
SG		 505 }
506
507 dev->can.state = CAN_STATE_ERROR_ACTIVE;
508
509 return 0;
510
f37d6e70 511err_adapter:
bb478555
SG		 512 if (err == -ENODEV)
513 netif_device_detach(dev->netdev);
514
515 netdev_warn(netdev, "couldn't submit control: %d\n", err);
516
f37d6e70
AK		 517 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
518 usb_free_urb(dev->tx_contexts[i].urb);
519 dev->tx_contexts[i].urb = NULL;
520 }
521err_tx:
522 usb_kill_anchored_urbs(&dev->rx_submitted);
523
bb478555
SG		 524 return err;
525}
526
527/*
528 * called by netdev to open the corresponding CAN interface.
529 */
530static int peak_usb_ndo_open(struct net_device *netdev)
531{
532 struct peak_usb_device *dev = netdev_priv(netdev);
533 int err;
534
535 /* common open */
536 err = open_candev(netdev);
537 if (err)
538 return err;
539
540 /* finally start device */
541 err = peak_usb_start(dev);
542 if (err) {
543 netdev_err(netdev, "couldn't start device: %d\n", err);
544 close_candev(netdev);
545 return err;
546 }
547
bb478555
SG		 548 netif_start_queue(netdev);
549
550 return 0;
551}
552
553/*
554 * unlink in-flight Rx and Tx urbs and free their memory.
555 */
556static void peak_usb_unlink_all_urbs(struct peak_usb_device *dev)
557{
558 int i;
559
560 /* free all Rx (submitted) urbs */
561 usb_kill_anchored_urbs(&dev->rx_submitted);
562
563 /* free unsubmitted Tx urbs first */
564 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
565 struct urb *urb = dev->tx_contexts[i].urb;
566
567 if (!urb ||
568 dev->tx_contexts[i].echo_index != PCAN_USB_MAX_TX_URBS) {
569 /*
570 * this urb is already released or always submitted,
571 * let usb core free by itself
572 */
573 continue;
574 }
575
576 usb_free_urb(urb);
577 dev->tx_contexts[i].urb = NULL;
578 }
579
580 /* then free all submitted Tx urbs */
581 usb_kill_anchored_urbs(&dev->tx_submitted);
582 atomic_set(&dev->active_tx_urbs, 0);
583}
584
585/*
586 * called by netdev to close the corresponding CAN interface.
587 */
588static int peak_usb_ndo_stop(struct net_device *netdev)
589{
590 struct peak_usb_device *dev = netdev_priv(netdev);
591
592 dev->state &= ~PCAN_USB_STATE_STARTED;
593 netif_stop_queue(netdev);
594
595 /* unlink all pending urbs and free used memory */
596 peak_usb_unlink_all_urbs(dev);
597
598 if (dev->adapter->dev_stop)
599 dev->adapter->dev_stop(dev);
600
601 close_candev(netdev);
602
bb478555
SG		 603 dev->can.state = CAN_STATE_STOPPED;
604
605 /* can set bus off now */
606 if (dev->adapter->dev_set_bus) {
607 int err = dev->adapter->dev_set_bus(dev, 0);
608 if (err)
609 return err;
610 }
611
612 return 0;
613}
614
615/*
616 * handle end of waiting for the device to reset
617 */
618void peak_usb_restart_complete(struct peak_usb_device *dev)
619{
620 /* finally MUST update can state */
621 dev->can.state = CAN_STATE_ERROR_ACTIVE;
622
623 /* netdev queue can be awaken now */
624 netif_wake_queue(dev->netdev);
625}
626
627void peak_usb_async_complete(struct urb *urb)
628{
629 kfree(urb->transfer_buffer);
630 usb_free_urb(urb);
631}
632
633/*
634 * device (auto-)restart mechanism runs in a timer context =>
635 * MUST handle restart with asynchronous usb transfers
636 */
637static int peak_usb_restart(struct peak_usb_device *dev)
638{
639 struct urb *urb;
640 int err;
641 u8 *buf;
642
643 /*
644 * if device doesn't define any asynchronous restart handler, simply
645 * wake the netdev queue up
646 */
647 if (!dev->adapter->dev_restart_async) {
648 peak_usb_restart_complete(dev);
649 return 0;
650 }
651
652 /* first allocate a urb to handle the asynchronous steps */
653 urb = usb_alloc_urb(0, GFP_ATOMIC);
654 if (!urb) {
655 netdev_err(dev->netdev, "no memory left for urb\n");
656 return -ENOMEM;
657 }
658
659 /* also allocate enough space for the commands to send */
660 buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_ATOMIC);
661 if (!buf) {
bb478555
SG		 662 usb_free_urb(urb);
663 return -ENOMEM;
664 }
665
666 /* call the device specific handler for the restart */
667 err = dev->adapter->dev_restart_async(dev, urb, buf);
668 if (!err)
669 return 0;
670
671 kfree(buf);
672 usb_free_urb(urb);
673
674 return err;
675}
676
677/*
678 * candev callback used to change CAN mode.
679 * Warning: this is called from a timer context!
680 */
681static int peak_usb_set_mode(struct net_device *netdev, enum can_mode mode)
682{
683 struct peak_usb_device *dev = netdev_priv(netdev);
684 int err = 0;
685
bb478555
SG		 686 switch (mode) {
687 case CAN_MODE_START:
688 err = peak_usb_restart(dev);
689 if (err)
690 netdev_err(netdev, "couldn't start device (err %d)\n",
691 err);
692 break;
693
694 default:
695 return -EOPNOTSUPP;
696 }
697
698 return err;
699}
700
701/*
b9f2cc1b 702 * candev callback used to set device nominal/arbitration bitrate.
bb478555
SG		 703 */
704static int peak_usb_set_bittiming(struct net_device *netdev)
705{
706 struct peak_usb_device *dev = netdev_priv(netdev);
b9f2cc1b 707 const struct peak_usb_adapter *pa = dev->adapter;
bb478555 708
b9f2cc1b
SG		 709 if (pa->dev_set_bittiming) {
710 struct can_bittiming *bt = &dev->can.bittiming;
711 int err = pa->dev_set_bittiming(dev, bt);
bb478555
SG		 712
713 if (err)
714 netdev_info(netdev, "couldn't set bitrate (err %d)\n",
b9f2cc1b
SG		 715 err);
716 return err;
717 }
718
719 return 0;
720}
721
722/*
723 * candev callback used to set device data bitrate.
724 */
725static int peak_usb_set_data_bittiming(struct net_device *netdev)
726{
727 struct peak_usb_device *dev = netdev_priv(netdev);
728 const struct peak_usb_adapter *pa = dev->adapter;
729
730 if (pa->dev_set_data_bittiming) {
731 struct can_bittiming *bt = &dev->can.data_bittiming;
732 int err = pa->dev_set_data_bittiming(dev, bt);
733
734 if (err)
735 netdev_info(netdev,
736 "couldn't set data bitrate (err %d)\n",
737 err);
738
bb478555
SG		 739 return err;
740 }
741
742 return 0;
743}
744
745static const struct net_device_ops peak_usb_netdev_ops = {
746 .ndo_open = peak_usb_ndo_open,
747 .ndo_stop = peak_usb_ndo_stop,
748 .ndo_start_xmit = peak_usb_ndo_start_xmit,
c971fa2a 749 .ndo_change_mtu = can_change_mtu,
bb478555
SG		 750};
751
752/*
753 * create one device which is attached to CAN controller #ctrl_idx of the
754 * usb adapter.
755 */
d6b5f30d 756static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
bb478555
SG		 757 struct usb_interface *intf, int ctrl_idx)
758{
759 struct usb_device *usb_dev = interface_to_usbdev(intf);
760 int sizeof_candev = peak_usb_adapter->sizeof_dev_private;
761 struct peak_usb_device *dev;
762 struct net_device *netdev;
763 int i, err;
764 u16 tmp16;
765
766 if (sizeof_candev < sizeof(struct peak_usb_device))
767 sizeof_candev = sizeof(struct peak_usb_device);
768
769 netdev = alloc_candev(sizeof_candev, PCAN_USB_MAX_TX_URBS);
770 if (!netdev) {
771 dev_err(&intf->dev, "%s: couldn't alloc candev\n",
772 PCAN_USB_DRIVER_NAME);
773 return -ENOMEM;
774 }
775
776 dev = netdev_priv(netdev);
777
778 /* allocate a buffer large enough to send commands */
779 dev->cmd_buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL);
780 if (!dev->cmd_buf) {
bb478555 781 err = -ENOMEM;
af35d0f1 782 goto lbl_free_candev;
bb478555
SG		 783 }
784
785 dev->udev = usb_dev;
786 dev->netdev = netdev;
787 dev->adapter = peak_usb_adapter;
788 dev->ctrl_idx = ctrl_idx;
789 dev->state = PCAN_USB_STATE_CONNECTED;
790
791 dev->ep_msg_in = peak_usb_adapter->ep_msg_in;
792 dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx];
793
794 dev->can.clock = peak_usb_adapter->clock;
06b23f7f 795 dev->can.bittiming_const = peak_usb_adapter->bittiming_const;
bb478555 796 dev->can.do_set_bittiming = peak_usb_set_bittiming;
06b23f7f 797 dev->can.data_bittiming_const = peak_usb_adapter->data_bittiming_const;
b9f2cc1b 798 dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
bb478555 799 dev->can.do_set_mode = peak_usb_set_mode;
e3629f56 800 dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter;
e3c5ea60 801 dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported;
bb478555
SG		 802
803 netdev->netdev_ops = &peak_usb_netdev_ops;
804
805 netdev->flags |= IFF_ECHO; /* we support local echo */
806
807 init_usb_anchor(&dev->rx_submitted);
808
809 init_usb_anchor(&dev->tx_submitted);
810 atomic_set(&dev->active_tx_urbs, 0);
811
812 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
813 dev->tx_contexts[i].echo_index = PCAN_USB_MAX_TX_URBS;
814
815 dev->prev_siblings = usb_get_intfdata(intf);
816 usb_set_intfdata(intf, dev);
817
818 SET_NETDEV_DEV(netdev, &intf->dev);
3e66d013 819 netdev->dev_id = ctrl_idx;
bb478555
SG		 820
821 err = register_candev(netdev);
822 if (err) {
823 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
af35d0f1 824 goto lbl_restore_intf_data;
bb478555
SG		 825 }
826
827 if (dev->prev_siblings)
828 (dev->prev_siblings)->next_siblings = dev;
829
830 /* keep hw revision into the netdevice */
831 tmp16 = le16_to_cpu(usb_dev->descriptor.bcdDevice);
832 dev->device_rev = tmp16 >> 8;
833
834 if (dev->adapter->dev_init) {
835 err = dev->adapter->dev_init(dev);
836 if (err)
af35d0f1 837 goto lbl_unregister_candev;
bb478555
SG		 838 }
839
840 /* set bus off */
841 if (dev->adapter->dev_set_bus) {
842 err = dev->adapter->dev_set_bus(dev, 0);
843 if (err)
af35d0f1 844 goto lbl_unregister_candev;
bb478555
SG		 845 }
846
847 /* get device number early */
848 if (dev->adapter->dev_get_device_id)
849 dev->adapter->dev_get_device_id(dev, &dev->device_number);
850
851 netdev_info(netdev, "attached to %s channel %u (device %u)\n",
852 peak_usb_adapter->name, ctrl_idx, dev->device_number);
853
854 return 0;
855
af35d0f1
SG		 856lbl_unregister_candev:
857 unregister_candev(netdev);
bb478555 858
af35d0f1 859lbl_restore_intf_data:
bb478555 860 usb_set_intfdata(intf, dev->prev_siblings);
af35d0f1
SG		 861 kfree(dev->cmd_buf);
862
863lbl_free_candev:
bb478555
SG		 864 free_candev(netdev);
865
866 return err;
867}
868
869/*
870 * called by the usb core when the device is unplugged from the system
871 */
872static void peak_usb_disconnect(struct usb_interface *intf)
873{
874 struct peak_usb_device *dev;
875
876 /* unregister as many netdev devices as siblings */
877 for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
878 struct net_device *netdev = dev->netdev;
879 char name[IFNAMSIZ];
880
881 dev->state &= ~PCAN_USB_STATE_CONNECTED;
882 strncpy(name, netdev->name, IFNAMSIZ);
883
884 unregister_netdev(netdev);
885 free_candev(netdev);
886
887 kfree(dev->cmd_buf);
888 dev->next_siblings = NULL;
889 if (dev->adapter->dev_free)
890 dev->adapter->dev_free(dev);
891
892 dev_info(&intf->dev, "%s removed\n", name);
893 }
894
895 usb_set_intfdata(intf, NULL);
896}
897
898/*
899 * probe function for new PEAK-System devices
900 */
901static int peak_usb_probe(struct usb_interface *intf,
902 const struct usb_device_id *id)
903{
904 struct usb_device *usb_dev = interface_to_usbdev(intf);
62bc24f6 905 const u16 usb_id_product = le16_to_cpu(usb_dev->descriptor.idProduct);
d6b5f30d 906 const struct peak_usb_adapter *peak_usb_adapter = NULL;
bb478555
SG		 907 int i, err = -ENOMEM;
908
909 usb_dev = interface_to_usbdev(intf);
910
911 /* get corresponding PCAN-USB adapter */
0adfd733
MKB		 912 for (i = 0; i < ARRAY_SIZE(peak_usb_adapters_list); i++)
913 if (peak_usb_adapters_list[i]->device_id == usb_id_product) {
914 peak_usb_adapter = peak_usb_adapters_list[i];
bb478555 915 break;
0adfd733 916 }
bb478555 917
bb478555
SG		 918 if (!peak_usb_adapter) {
919 /* should never come except device_id bad usage in this file */
920 pr_err("%s: didn't find device id. 0x%x in devices list\n",
921 PCAN_USB_DRIVER_NAME, usb_dev->descriptor.idProduct);
922 return -ENODEV;
923 }
924
925 /* got corresponding adapter: check if it handles current interface */
926 if (peak_usb_adapter->intf_probe) {
927 err = peak_usb_adapter->intf_probe(intf);
928 if (err)
929 return err;
930 }
931
932 for (i = 0; i < peak_usb_adapter->ctrl_count; i++) {
933 err = peak_usb_create_dev(peak_usb_adapter, intf, i);
934 if (err) {
935 /* deregister already created devices */
936 peak_usb_disconnect(intf);
937 break;
938 }
939 }
940
941 return err;
942}
943
944/* usb specific object needed to register this driver with the usb subsystem */
945static struct usb_driver peak_usb_driver = {
946 .name = PCAN_USB_DRIVER_NAME,
947 .disconnect = peak_usb_disconnect,
948 .probe = peak_usb_probe,
949 .id_table = peak_usb_table,
950};
951
952static int __init peak_usb_init(void)
953{
954 int err;
955
956 /* register this driver with the USB subsystem */
957 err = usb_register(&peak_usb_driver);
958 if (err)
959 pr_err("%s: usb_register failed (err %d)\n",
960 PCAN_USB_DRIVER_NAME, err);
961
962 return err;
963}
964
965static int peak_usb_do_device_exit(struct device *d, void *arg)
966{
967 struct usb_interface *intf = to_usb_interface(d);
968 struct peak_usb_device *dev;
969
970 /* stop as many netdev devices as siblings */
971 for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
972 struct net_device *netdev = dev->netdev;
973
974 if (netif_device_present(netdev))
975 if (dev->adapter->dev_exit)
976 dev->adapter->dev_exit(dev);
977 }
978
979 return 0;
980}
981
982static void __exit peak_usb_exit(void)
983{
984 int err;
985
986 /* last chance do send any synchronous commands here */
987 err = driver_for_each_device(&peak_usb_driver.drvwrap.driver, NULL,
988 NULL, peak_usb_do_device_exit);
989 if (err)
990 pr_err("%s: failed to stop all can devices (err %d)\n",
991 PCAN_USB_DRIVER_NAME, err);
992
993 /* deregister this driver with the USB subsystem */
994 usb_deregister(&peak_usb_driver);
995
996 pr_info("%s: PCAN-USB interfaces driver unloaded\n",
997 PCAN_USB_DRIVER_NAME);
998}
999
1000module_init(peak_usb_init);
1001module_exit(peak_usb_exit);
Linux kernel - Deliverables
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