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Merge remote-tracking branch 'mmc-uh/next'
[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 */
860e9538 277 netif_trans_update(netdev);
bb478555
SG		 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 {
860e9538 376 netif_trans_update(netdev);
bb478555
SG		 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) {
bb478555
SG		 402 err = -ENOMEM;
403 break;
404 }
405
406 buf = kmalloc(dev->adapter->rx_buffer_size, GFP_KERNEL);
407 if (!buf) {
bb478555
SG		 408 usb_free_urb(urb);
409 err = -ENOMEM;
410 break;
411 }
412
413 usb_fill_bulk_urb(urb, dev->udev,
414 usb_rcvbulkpipe(dev->udev, dev->ep_msg_in),
415 buf, dev->adapter->rx_buffer_size,
416 peak_usb_read_bulk_callback, dev);
417
418 /* ask last usb_free_urb() to also kfree() transfer_buffer */
419 urb->transfer_flags |= URB_FREE_BUFFER;
420 usb_anchor_urb(urb, &dev->rx_submitted);
421
422 err = usb_submit_urb(urb, GFP_KERNEL);
423 if (err) {
424 if (err == -ENODEV)
425 netif_device_detach(dev->netdev);
426
427 usb_unanchor_urb(urb);
428 kfree(buf);
429 usb_free_urb(urb);
430 break;
431 }
432
433 /* drop reference, USB core will take care of freeing it */
434 usb_free_urb(urb);
435 }
436
437 /* did we submit any URBs? Warn if we was not able to submit all urbs */
438 if (i < PCAN_USB_MAX_RX_URBS) {
439 if (i == 0) {
440 netdev_err(netdev, "couldn't setup any rx URB\n");
441 return err;
442 }
443
444 netdev_warn(netdev, "rx performance may be slow\n");
445 }
446
447 /* pre-alloc tx buffers and corresponding urbs */
448 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
449 struct peak_tx_urb_context *context;
450 struct urb *urb;
451 u8 *buf;
452
453 /* create a URB and a buffer for it, to transmit usb messages */
454 urb = usb_alloc_urb(0, GFP_KERNEL);
455 if (!urb) {
bb478555
SG		 456 err = -ENOMEM;
457 break;
458 }
459
460 buf = kmalloc(dev->adapter->tx_buffer_size, GFP_KERNEL);
461 if (!buf) {
bb478555
SG		 462 usb_free_urb(urb);
463 err = -ENOMEM;
464 break;
465 }
466
467 context = dev->tx_contexts + i;
468 context->dev = dev;
469 context->urb = urb;
470
471 usb_fill_bulk_urb(urb, dev->udev,
472 usb_sndbulkpipe(dev->udev, dev->ep_msg_out),
473 buf, dev->adapter->tx_buffer_size,
474 peak_usb_write_bulk_callback, context);
475
476 /* ask last usb_free_urb() to also kfree() transfer_buffer */
477 urb->transfer_flags |= URB_FREE_BUFFER;
478 }
479
480 /* warn if we were not able to allocate enough tx contexts */
481 if (i < PCAN_USB_MAX_TX_URBS) {
482 if (i == 0) {
483 netdev_err(netdev, "couldn't setup any tx URB\n");
f37d6e70 484 goto err_tx;
bb478555
SG		 485 }
486
487 netdev_warn(netdev, "tx performance may be slow\n");
488 }
489
490 if (dev->adapter->dev_start) {
491 err = dev->adapter->dev_start(dev);
492 if (err)
f37d6e70 493 goto err_adapter;
bb478555
SG		 494 }
495
496 dev->state |= PCAN_USB_STATE_STARTED;
497
498 /* can set bus on now */
499 if (dev->adapter->dev_set_bus) {
500 err = dev->adapter->dev_set_bus(dev, 1);
501 if (err)
f37d6e70 502 goto err_adapter;
bb478555
SG		 503 }
504
505 dev->can.state = CAN_STATE_ERROR_ACTIVE;
506
507 return 0;
508
f37d6e70 509err_adapter:
bb478555
SG		 510 if (err == -ENODEV)
511 netif_device_detach(dev->netdev);
512
513 netdev_warn(netdev, "couldn't submit control: %d\n", err);
514
f37d6e70
AK		 515 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
516 usb_free_urb(dev->tx_contexts[i].urb);
517 dev->tx_contexts[i].urb = NULL;
518 }
519err_tx:
520 usb_kill_anchored_urbs(&dev->rx_submitted);
521
bb478555
SG		 522 return err;
523}
524
525/*
526 * called by netdev to open the corresponding CAN interface.
527 */
528static int peak_usb_ndo_open(struct net_device *netdev)
529{
530 struct peak_usb_device *dev = netdev_priv(netdev);
531 int err;
532
533 /* common open */
534 err = open_candev(netdev);
535 if (err)
536 return err;
537
538 /* finally start device */
539 err = peak_usb_start(dev);
540 if (err) {
541 netdev_err(netdev, "couldn't start device: %d\n", err);
542 close_candev(netdev);
543 return err;
544 }
545
bb478555
SG		 546 netif_start_queue(netdev);
547
548 return 0;
549}
550
551/*
552 * unlink in-flight Rx and Tx urbs and free their memory.
553 */
554static void peak_usb_unlink_all_urbs(struct peak_usb_device *dev)
555{
556 int i;
557
558 /* free all Rx (submitted) urbs */
559 usb_kill_anchored_urbs(&dev->rx_submitted);
560
561 /* free unsubmitted Tx urbs first */
562 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++) {
563 struct urb *urb = dev->tx_contexts[i].urb;
564
565 if (!urb ||
566 dev->tx_contexts[i].echo_index != PCAN_USB_MAX_TX_URBS) {
567 /*
568 * this urb is already released or always submitted,
569 * let usb core free by itself
570 */
571 continue;
572 }
573
574 usb_free_urb(urb);
575 dev->tx_contexts[i].urb = NULL;
576 }
577
578 /* then free all submitted Tx urbs */
579 usb_kill_anchored_urbs(&dev->tx_submitted);
580 atomic_set(&dev->active_tx_urbs, 0);
581}
582
583/*
584 * called by netdev to close the corresponding CAN interface.
585 */
586static int peak_usb_ndo_stop(struct net_device *netdev)
587{
588 struct peak_usb_device *dev = netdev_priv(netdev);
589
590 dev->state &= ~PCAN_USB_STATE_STARTED;
591 netif_stop_queue(netdev);
592
593 /* unlink all pending urbs and free used memory */
594 peak_usb_unlink_all_urbs(dev);
595
596 if (dev->adapter->dev_stop)
597 dev->adapter->dev_stop(dev);
598
599 close_candev(netdev);
600
bb478555
SG		 601 dev->can.state = CAN_STATE_STOPPED;
602
603 /* can set bus off now */
604 if (dev->adapter->dev_set_bus) {
605 int err = dev->adapter->dev_set_bus(dev, 0);
606 if (err)
607 return err;
608 }
609
610 return 0;
611}
612
613/*
614 * handle end of waiting for the device to reset
615 */
616void peak_usb_restart_complete(struct peak_usb_device *dev)
617{
618 /* finally MUST update can state */
619 dev->can.state = CAN_STATE_ERROR_ACTIVE;
620
621 /* netdev queue can be awaken now */
622 netif_wake_queue(dev->netdev);
623}
624
625void peak_usb_async_complete(struct urb *urb)
626{
627 kfree(urb->transfer_buffer);
628 usb_free_urb(urb);
629}
630
631/*
632 * device (auto-)restart mechanism runs in a timer context =>
633 * MUST handle restart with asynchronous usb transfers
634 */
635static int peak_usb_restart(struct peak_usb_device *dev)
636{
637 struct urb *urb;
638 int err;
639 u8 *buf;
640
641 /*
642 * if device doesn't define any asynchronous restart handler, simply
643 * wake the netdev queue up
644 */
645 if (!dev->adapter->dev_restart_async) {
646 peak_usb_restart_complete(dev);
647 return 0;
648 }
649
650 /* first allocate a urb to handle the asynchronous steps */
651 urb = usb_alloc_urb(0, GFP_ATOMIC);
2479204b 652 if (!urb)
bb478555 653 return -ENOMEM;
bb478555
SG		 654
655 /* also allocate enough space for the commands to send */
656 buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_ATOMIC);
657 if (!buf) {
bb478555
SG		 658 usb_free_urb(urb);
659 return -ENOMEM;
660 }
661
662 /* call the device specific handler for the restart */
663 err = dev->adapter->dev_restart_async(dev, urb, buf);
664 if (!err)
665 return 0;
666
667 kfree(buf);
668 usb_free_urb(urb);
669
670 return err;
671}
672
673/*
674 * candev callback used to change CAN mode.
675 * Warning: this is called from a timer context!
676 */
677static int peak_usb_set_mode(struct net_device *netdev, enum can_mode mode)
678{
679 struct peak_usb_device *dev = netdev_priv(netdev);
680 int err = 0;
681
bb478555
SG		 682 switch (mode) {
683 case CAN_MODE_START:
684 err = peak_usb_restart(dev);
685 if (err)
686 netdev_err(netdev, "couldn't start device (err %d)\n",
687 err);
688 break;
689
690 default:
691 return -EOPNOTSUPP;
692 }
693
694 return err;
695}
696
697/*
b9f2cc1b 698 * candev callback used to set device nominal/arbitration bitrate.
bb478555
SG		 699 */
700static int peak_usb_set_bittiming(struct net_device *netdev)
701{
702 struct peak_usb_device *dev = netdev_priv(netdev);
b9f2cc1b 703 const struct peak_usb_adapter *pa = dev->adapter;
bb478555 704
b9f2cc1b
SG		 705 if (pa->dev_set_bittiming) {
706 struct can_bittiming *bt = &dev->can.bittiming;
707 int err = pa->dev_set_bittiming(dev, bt);
bb478555
SG		 708
709 if (err)
710 netdev_info(netdev, "couldn't set bitrate (err %d)\n",
b9f2cc1b
SG		 711 err);
712 return err;
713 }
714
715 return 0;
716}
717
718/*
719 * candev callback used to set device data bitrate.
720 */
721static int peak_usb_set_data_bittiming(struct net_device *netdev)
722{
723 struct peak_usb_device *dev = netdev_priv(netdev);
724 const struct peak_usb_adapter *pa = dev->adapter;
725
726 if (pa->dev_set_data_bittiming) {
727 struct can_bittiming *bt = &dev->can.data_bittiming;
728 int err = pa->dev_set_data_bittiming(dev, bt);
729
730 if (err)
731 netdev_info(netdev,
732 "couldn't set data bitrate (err %d)\n",
733 err);
734
bb478555
SG		 735 return err;
736 }
737
738 return 0;
739}
740
741static const struct net_device_ops peak_usb_netdev_ops = {
742 .ndo_open = peak_usb_ndo_open,
743 .ndo_stop = peak_usb_ndo_stop,
744 .ndo_start_xmit = peak_usb_ndo_start_xmit,
c971fa2a 745 .ndo_change_mtu = can_change_mtu,
bb478555
SG		 746};
747
748/*
749 * create one device which is attached to CAN controller #ctrl_idx of the
750 * usb adapter.
751 */
d6b5f30d 752static int peak_usb_create_dev(const struct peak_usb_adapter *peak_usb_adapter,
bb478555
SG		 753 struct usb_interface *intf, int ctrl_idx)
754{
755 struct usb_device *usb_dev = interface_to_usbdev(intf);
756 int sizeof_candev = peak_usb_adapter->sizeof_dev_private;
757 struct peak_usb_device *dev;
758 struct net_device *netdev;
759 int i, err;
760 u16 tmp16;
761
762 if (sizeof_candev < sizeof(struct peak_usb_device))
763 sizeof_candev = sizeof(struct peak_usb_device);
764
765 netdev = alloc_candev(sizeof_candev, PCAN_USB_MAX_TX_URBS);
766 if (!netdev) {
767 dev_err(&intf->dev, "%s: couldn't alloc candev\n",
768 PCAN_USB_DRIVER_NAME);
769 return -ENOMEM;
770 }
771
772 dev = netdev_priv(netdev);
773
774 /* allocate a buffer large enough to send commands */
775 dev->cmd_buf = kmalloc(PCAN_USB_MAX_CMD_LEN, GFP_KERNEL);
776 if (!dev->cmd_buf) {
bb478555 777 err = -ENOMEM;
af35d0f1 778 goto lbl_free_candev;
bb478555
SG		 779 }
780
781 dev->udev = usb_dev;
782 dev->netdev = netdev;
783 dev->adapter = peak_usb_adapter;
784 dev->ctrl_idx = ctrl_idx;
785 dev->state = PCAN_USB_STATE_CONNECTED;
786
787 dev->ep_msg_in = peak_usb_adapter->ep_msg_in;
788 dev->ep_msg_out = peak_usb_adapter->ep_msg_out[ctrl_idx];
789
790 dev->can.clock = peak_usb_adapter->clock;
06b23f7f 791 dev->can.bittiming_const = peak_usb_adapter->bittiming_const;
bb478555 792 dev->can.do_set_bittiming = peak_usb_set_bittiming;
06b23f7f 793 dev->can.data_bittiming_const = peak_usb_adapter->data_bittiming_const;
b9f2cc1b 794 dev->can.do_set_data_bittiming = peak_usb_set_data_bittiming;
bb478555 795 dev->can.do_set_mode = peak_usb_set_mode;
e3629f56 796 dev->can.do_get_berr_counter = peak_usb_adapter->do_get_berr_counter;
e3c5ea60 797 dev->can.ctrlmode_supported = peak_usb_adapter->ctrlmode_supported;
bb478555
SG		 798
799 netdev->netdev_ops = &peak_usb_netdev_ops;
800
801 netdev->flags |= IFF_ECHO; /* we support local echo */
802
803 init_usb_anchor(&dev->rx_submitted);
804
805 init_usb_anchor(&dev->tx_submitted);
806 atomic_set(&dev->active_tx_urbs, 0);
807
808 for (i = 0; i < PCAN_USB_MAX_TX_URBS; i++)
809 dev->tx_contexts[i].echo_index = PCAN_USB_MAX_TX_URBS;
810
811 dev->prev_siblings = usb_get_intfdata(intf);
812 usb_set_intfdata(intf, dev);
813
814 SET_NETDEV_DEV(netdev, &intf->dev);
3e66d013 815 netdev->dev_id = ctrl_idx;
bb478555
SG		 816
817 err = register_candev(netdev);
818 if (err) {
819 dev_err(&intf->dev, "couldn't register CAN device: %d\n", err);
af35d0f1 820 goto lbl_restore_intf_data;
bb478555
SG		 821 }
822
823 if (dev->prev_siblings)
824 (dev->prev_siblings)->next_siblings = dev;
825
826 /* keep hw revision into the netdevice */
827 tmp16 = le16_to_cpu(usb_dev->descriptor.bcdDevice);
828 dev->device_rev = tmp16 >> 8;
829
830 if (dev->adapter->dev_init) {
831 err = dev->adapter->dev_init(dev);
832 if (err)
af35d0f1 833 goto lbl_unregister_candev;
bb478555
SG		 834 }
835
836 /* set bus off */
837 if (dev->adapter->dev_set_bus) {
838 err = dev->adapter->dev_set_bus(dev, 0);
839 if (err)
af35d0f1 840 goto lbl_unregister_candev;
bb478555
SG		 841 }
842
843 /* get device number early */
844 if (dev->adapter->dev_get_device_id)
845 dev->adapter->dev_get_device_id(dev, &dev->device_number);
846
847 netdev_info(netdev, "attached to %s channel %u (device %u)\n",
848 peak_usb_adapter->name, ctrl_idx, dev->device_number);
849
850 return 0;
851
af35d0f1
SG		 852lbl_unregister_candev:
853 unregister_candev(netdev);
bb478555 854
af35d0f1 855lbl_restore_intf_data:
bb478555 856 usb_set_intfdata(intf, dev->prev_siblings);
af35d0f1
SG		 857 kfree(dev->cmd_buf);
858
859lbl_free_candev:
bb478555
SG		 860 free_candev(netdev);
861
862 return err;
863}
864
865/*
866 * called by the usb core when the device is unplugged from the system
867 */
868static void peak_usb_disconnect(struct usb_interface *intf)
869{
870 struct peak_usb_device *dev;
871
872 /* unregister as many netdev devices as siblings */
873 for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
874 struct net_device *netdev = dev->netdev;
875 char name[IFNAMSIZ];
876
877 dev->state &= ~PCAN_USB_STATE_CONNECTED;
878 strncpy(name, netdev->name, IFNAMSIZ);
879
880 unregister_netdev(netdev);
881 free_candev(netdev);
882
883 kfree(dev->cmd_buf);
884 dev->next_siblings = NULL;
885 if (dev->adapter->dev_free)
886 dev->adapter->dev_free(dev);
887
888 dev_info(&intf->dev, "%s removed\n", name);
889 }
890
891 usb_set_intfdata(intf, NULL);
892}
893
894/*
895 * probe function for new PEAK-System devices
896 */
897static int peak_usb_probe(struct usb_interface *intf,
898 const struct usb_device_id *id)
899{
900 struct usb_device *usb_dev = interface_to_usbdev(intf);
62bc24f6 901 const u16 usb_id_product = le16_to_cpu(usb_dev->descriptor.idProduct);
d6b5f30d 902 const struct peak_usb_adapter *peak_usb_adapter = NULL;
bb478555
SG		 903 int i, err = -ENOMEM;
904
905 usb_dev = interface_to_usbdev(intf);
906
907 /* get corresponding PCAN-USB adapter */
0adfd733
MKB		 908 for (i = 0; i < ARRAY_SIZE(peak_usb_adapters_list); i++)
909 if (peak_usb_adapters_list[i]->device_id == usb_id_product) {
910 peak_usb_adapter = peak_usb_adapters_list[i];
bb478555 911 break;
0adfd733 912 }
bb478555 913
bb478555
SG		 914 if (!peak_usb_adapter) {
915 /* should never come except device_id bad usage in this file */
916 pr_err("%s: didn't find device id. 0x%x in devices list\n",
917 PCAN_USB_DRIVER_NAME, usb_dev->descriptor.idProduct);
918 return -ENODEV;
919 }
920
921 /* got corresponding adapter: check if it handles current interface */
922 if (peak_usb_adapter->intf_probe) {
923 err = peak_usb_adapter->intf_probe(intf);
924 if (err)
925 return err;
926 }
927
928 for (i = 0; i < peak_usb_adapter->ctrl_count; i++) {
929 err = peak_usb_create_dev(peak_usb_adapter, intf, i);
930 if (err) {
931 /* deregister already created devices */
932 peak_usb_disconnect(intf);
933 break;
934 }
935 }
936
937 return err;
938}
939
940/* usb specific object needed to register this driver with the usb subsystem */
941static struct usb_driver peak_usb_driver = {
942 .name = PCAN_USB_DRIVER_NAME,
943 .disconnect = peak_usb_disconnect,
944 .probe = peak_usb_probe,
945 .id_table = peak_usb_table,
946};
947
948static int __init peak_usb_init(void)
949{
950 int err;
951
952 /* register this driver with the USB subsystem */
953 err = usb_register(&peak_usb_driver);
954 if (err)
955 pr_err("%s: usb_register failed (err %d)\n",
956 PCAN_USB_DRIVER_NAME, err);
957
958 return err;
959}
960
961static int peak_usb_do_device_exit(struct device *d, void *arg)
962{
963 struct usb_interface *intf = to_usb_interface(d);
964 struct peak_usb_device *dev;
965
966 /* stop as many netdev devices as siblings */
967 for (dev = usb_get_intfdata(intf); dev; dev = dev->prev_siblings) {
968 struct net_device *netdev = dev->netdev;
969
970 if (netif_device_present(netdev))
971 if (dev->adapter->dev_exit)
972 dev->adapter->dev_exit(dev);
973 }
974
975 return 0;
976}
977
978static void __exit peak_usb_exit(void)
979{
980 int err;
981
982 /* last chance do send any synchronous commands here */
983 err = driver_for_each_device(&peak_usb_driver.drvwrap.driver, NULL,
984 NULL, peak_usb_do_device_exit);
985 if (err)
986 pr_err("%s: failed to stop all can devices (err %d)\n",
987 PCAN_USB_DRIVER_NAME, err);
988
989 /* deregister this driver with the USB subsystem */
990 usb_deregister(&peak_usb_driver);
991
992 pr_info("%s: PCAN-USB interfaces driver unloaded\n",
993 PCAN_USB_DRIVER_NAME);
994}
995
996module_init(peak_usb_init);
997module_exit(peak_usb_exit);
Linux kernel - Deliverables
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