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carl9170: interrupt urbs must not set URB_ZERO_PACKET
[net-next-2.6.git] / drivers / net / wireless / ath / carl9170 / usb.c
CommitLineData
a84fab3c
CL		 1/*
2 * Atheros CARL9170 driver
3 *
4 * USB - frontend
5 *
6 * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
7 * Copyright 2009, 2010, Christian Lamparter <chunkeey@googlemail.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; see the file COPYING. If not, see
21 * http://www.gnu.org/licenses/.
22 *
23 * This file incorporates work covered by the following copyright and
24 * permission notice:
25 * Copyright (c) 2007-2008 Atheros Communications, Inc.
26 *
27 * Permission to use, copy, modify, and/or distribute this software for any
28 * purpose with or without fee is hereby granted, provided that the above
29 * copyright notice and this permission notice appear in all copies.
30 *
31 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
32 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
33 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
34 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
35 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
36 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
37 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
38 */
39
40#include <linux/module.h>
41#include <linux/slab.h>
42#include <linux/usb.h>
43#include <linux/firmware.h>
44#include <linux/etherdevice.h>
45#include <linux/device.h>
46#include <net/mac80211.h>
47#include "carl9170.h"
48#include "cmd.h"
49#include "hw.h"
50#include "fwcmd.h"
51
52MODULE_AUTHOR("Johannes Berg <johannes@sipsolutions.net>");
53MODULE_AUTHOR("Christian Lamparter <chunkeey@googlemail.com>");
54MODULE_LICENSE("GPL");
55MODULE_DESCRIPTION("Atheros AR9170 802.11n USB wireless");
56MODULE_FIRMWARE(CARL9170FW_NAME);
57MODULE_ALIAS("ar9170usb");
58MODULE_ALIAS("arusb_lnx");
59
60/*
61 * Note:
62 *
63 * Always update our wiki's device list (located at:
64 * http://wireless.kernel.org/en/users/Drivers/ar9170/devices ),
65 * whenever you add a new device.
66 */
67static struct usb_device_id carl9170_usb_ids[] = {
68 /* Atheros 9170 */
69 { USB_DEVICE(0x0cf3, 0x9170) },
70 /* Atheros TG121N */
71 { USB_DEVICE(0x0cf3, 0x1001) },
72 /* TP-Link TL-WN821N v2 */
73 { USB_DEVICE(0x0cf3, 0x1002), .driver_info = CARL9170_WPS_BUTTON |
74 CARL9170_ONE_LED },
75 /* 3Com Dual Band 802.11n USB Adapter */
76 { USB_DEVICE(0x0cf3, 0x1010) },
77 /* H3C Dual Band 802.11n USB Adapter */
78 { USB_DEVICE(0x0cf3, 0x1011) },
79 /* Cace Airpcap NX */
80 { USB_DEVICE(0xcace, 0x0300) },
81 /* D-Link DWA 160 A1 */
82 { USB_DEVICE(0x07d1, 0x3c10) },
83 /* D-Link DWA 160 A2 */
84 { USB_DEVICE(0x07d1, 0x3a09) },
85 /* Netgear WNA1000 */
86 { USB_DEVICE(0x0846, 0x9040) },
87 /* Netgear WNDA3100 */
88 { USB_DEVICE(0x0846, 0x9010) },
89 /* Netgear WN111 v2 */
90 { USB_DEVICE(0x0846, 0x9001), .driver_info = CARL9170_ONE_LED },
91 /* Zydas ZD1221 */
92 { USB_DEVICE(0x0ace, 0x1221) },
93 /* Proxim ORiNOCO 802.11n USB */
94 { USB_DEVICE(0x1435, 0x0804) },
95 /* WNC Generic 11n USB Dongle */
96 { USB_DEVICE(0x1435, 0x0326) },
97 /* ZyXEL NWD271N */
98 { USB_DEVICE(0x0586, 0x3417) },
99 /* Z-Com UB81 BG */
100 { USB_DEVICE(0x0cde, 0x0023) },
101 /* Z-Com UB82 ABG */
102 { USB_DEVICE(0x0cde, 0x0026) },
103 /* Sphairon Homelink 1202 */
104 { USB_DEVICE(0x0cde, 0x0027) },
105 /* Arcadyan WN7512 */
106 { USB_DEVICE(0x083a, 0xf522) },
107 /* Planex GWUS300 */
108 { USB_DEVICE(0x2019, 0x5304) },
109 /* IO-Data WNGDNUS2 */
110 { USB_DEVICE(0x04bb, 0x093f) },
111 /* NEC WL300NU-G */
112 { USB_DEVICE(0x0409, 0x0249) },
113 /* AVM FRITZ!WLAN USB Stick N */
114 { USB_DEVICE(0x057c, 0x8401) },
115 /* AVM FRITZ!WLAN USB Stick N 2.4 */
116 { USB_DEVICE(0x057c, 0x8402) },
117 /* Qwest/Actiontec 802AIN Wireless N USB Network Adapter */
118 { USB_DEVICE(0x1668, 0x1200) },
119
120 /* terminate */
121 {}
122};
123MODULE_DEVICE_TABLE(usb, carl9170_usb_ids);
124
125static void carl9170_usb_submit_data_urb(struct ar9170 *ar)
126{
127 struct urb *urb;
128 int err;
129
130 if (atomic_inc_return(&ar->tx_anch_urbs) > AR9170_NUM_TX_URBS)
131 goto err_acc;
132
133 urb = usb_get_from_anchor(&ar->tx_wait);
134 if (!urb)
135 goto err_acc;
136
137 usb_anchor_urb(urb, &ar->tx_anch);
138
139 err = usb_submit_urb(urb, GFP_ATOMIC);
140 if (unlikely(err)) {
141 if (net_ratelimit()) {
142 dev_err(&ar->udev->dev, "tx submit failed (%d)\n",
143 urb->status);
144 }
145
146 usb_unanchor_urb(urb);
147 usb_anchor_urb(urb, &ar->tx_err);
148 }
149
150 usb_free_urb(urb);
151
152 if (likely(err == 0))
153 return;
154
155err_acc:
156 atomic_dec(&ar->tx_anch_urbs);
157}
158
159static void carl9170_usb_tx_data_complete(struct urb *urb)
160{
161 struct ar9170 *ar = (struct ar9170 *)
162 usb_get_intfdata(usb_ifnum_to_if(urb->dev, 0));
163
164 if (WARN_ON_ONCE(!ar)) {
165 dev_kfree_skb_irq(urb->context);
166 return;
167 }
168
169 atomic_dec(&ar->tx_anch_urbs);
170
171 switch (urb->status) {
172 /* everything is fine */
173 case 0:
174 carl9170_tx_callback(ar, (void *)urb->context);
175 break;
176
177 /* disconnect */
178 case -ENOENT:
179 case -ECONNRESET:
180 case -ENODEV:
181 case -ESHUTDOWN:
182 /*
183 * Defer the frame clean-up to the tasklet worker.
184 * This is necessary, because carl9170_tx_drop
185 * does not work in an irqsave context.
186 */
187 usb_anchor_urb(urb, &ar->tx_err);
188 return;
189
190 /* a random transmission error has occurred? */
191 default:
192 if (net_ratelimit()) {
193 dev_err(&ar->udev->dev, "tx failed (%d)\n",
194 urb->status);
195 }
196
197 usb_anchor_urb(urb, &ar->tx_err);
198 break;
199 }
200
201 if (likely(IS_STARTED(ar)))
202 carl9170_usb_submit_data_urb(ar);
203}
204
205static int carl9170_usb_submit_cmd_urb(struct ar9170 *ar)
206{
207 struct urb *urb;
208 int err;
209
210 if (atomic_inc_return(&ar->tx_cmd_urbs) != 1) {
211 atomic_dec(&ar->tx_cmd_urbs);
212 return 0;
213 }
214
215 urb = usb_get_from_anchor(&ar->tx_cmd);
216 if (!urb) {
217 atomic_dec(&ar->tx_cmd_urbs);
218 return 0;
219 }
220
221 usb_anchor_urb(urb, &ar->tx_anch);
222 err = usb_submit_urb(urb, GFP_ATOMIC);
223 if (unlikely(err)) {
224 usb_unanchor_urb(urb);
225 atomic_dec(&ar->tx_cmd_urbs);
226 }
227 usb_free_urb(urb);
228
229 return err;
230}
231
232static void carl9170_usb_cmd_complete(struct urb *urb)
233{
234 struct ar9170 *ar = urb->context;
235 int err = 0;
236
237 if (WARN_ON_ONCE(!ar))
238 return;
239
240 atomic_dec(&ar->tx_cmd_urbs);
241
242 switch (urb->status) {
243 /* everything is fine */
244 case 0:
245 break;
246
247 /* disconnect */
248 case -ENOENT:
249 case -ECONNRESET:
250 case -ENODEV:
251 case -ESHUTDOWN:
252 return;
253
254 default:
255 err = urb->status;
256 break;
257 }
258
259 if (!IS_INITIALIZED(ar))
260 return;
261
262 if (err)
263 dev_err(&ar->udev->dev, "submit cmd cb failed (%d).\n", err);
264
265 err = carl9170_usb_submit_cmd_urb(ar);
266 if (err)
267 dev_err(&ar->udev->dev, "submit cmd failed (%d).\n", err);
268}
269
270static void carl9170_usb_rx_irq_complete(struct urb *urb)
271{
272 struct ar9170 *ar = urb->context;
273
274 if (WARN_ON_ONCE(!ar))
275 return;
276
277 switch (urb->status) {
278 /* everything is fine */
279 case 0:
280 break;
281
282 /* disconnect */
283 case -ENOENT:
284 case -ECONNRESET:
285 case -ENODEV:
286 case -ESHUTDOWN:
287 return;
288
289 default:
290 goto resubmit;
291 }
292
293 carl9170_handle_command_response(ar, urb->transfer_buffer,
294 urb->actual_length);
295
296resubmit:
297 usb_anchor_urb(urb, &ar->rx_anch);
298 if (unlikely(usb_submit_urb(urb, GFP_ATOMIC)))
299 usb_unanchor_urb(urb);
300}
301
302static int carl9170_usb_submit_rx_urb(struct ar9170 *ar, gfp_t gfp)
303{
304 struct urb *urb;
305 int err = 0, runs = 0;
306
307 while ((atomic_read(&ar->rx_anch_urbs) < AR9170_NUM_RX_URBS) &&
308 (runs++ < AR9170_NUM_RX_URBS)) {
309 err = -ENOSPC;
310 urb = usb_get_from_anchor(&ar->rx_pool);
311 if (urb) {
312 usb_anchor_urb(urb, &ar->rx_anch);
313 err = usb_submit_urb(urb, gfp);
314 if (unlikely(err)) {
315 usb_unanchor_urb(urb);
316 usb_anchor_urb(urb, &ar->rx_pool);
317 } else {
318 atomic_dec(&ar->rx_pool_urbs);
319 atomic_inc(&ar->rx_anch_urbs);
320 }
321 usb_free_urb(urb);
322 }
323 }
324
325 return err;
326}
327
328static void carl9170_usb_rx_work(struct ar9170 *ar)
329{
330 struct urb *urb;
331 int i;
332
333 for (i = 0; i < AR9170_NUM_RX_URBS_POOL; i++) {
334 urb = usb_get_from_anchor(&ar->rx_work);
335 if (!urb)
336 break;
337
338 atomic_dec(&ar->rx_work_urbs);
339 if (IS_INITIALIZED(ar)) {
340 carl9170_rx(ar, urb->transfer_buffer,
341 urb->actual_length);
342 }
343
344 usb_anchor_urb(urb, &ar->rx_pool);
345 atomic_inc(&ar->rx_pool_urbs);
346
347 usb_free_urb(urb);
348
349 carl9170_usb_submit_rx_urb(ar, GFP_ATOMIC);
350 }
351}
352
353void carl9170_usb_handle_tx_err(struct ar9170 *ar)
354{
355 struct urb *urb;
356
357 while ((urb = usb_get_from_anchor(&ar->tx_err))) {
358 struct sk_buff *skb = (void *)urb->context;
359
360 carl9170_tx_drop(ar, skb);
361 carl9170_tx_callback(ar, skb);
362 usb_free_urb(urb);
363 }
364}
365
366static void carl9170_usb_tasklet(unsigned long data)
367{
368 struct ar9170 *ar = (struct ar9170 *) data;
369
cf6487d0
CL		 370 if (!IS_INITIALIZED(ar))
371 return;
372
a84fab3c
CL		 373 carl9170_usb_rx_work(ar);
374
375 /*
376 * Strictly speaking: The tx scheduler is not part of the USB system.
377 * But the rx worker returns frames back to the mac80211-stack and
378 * this is the _perfect_ place to generate the next transmissions.
379 */
380 if (IS_STARTED(ar))
381 carl9170_tx_scheduler(ar);
382}
383
384static void carl9170_usb_rx_complete(struct urb *urb)
385{
386 struct ar9170 *ar = (struct ar9170 *)urb->context;
387 int err;
388
389 if (WARN_ON_ONCE(!ar))
390 return;
391
392 atomic_dec(&ar->rx_anch_urbs);
393
394 switch (urb->status) {
395 case 0:
396 /* rx path */
397 usb_anchor_urb(urb, &ar->rx_work);
398 atomic_inc(&ar->rx_work_urbs);
399 break;
400
401 case -ENOENT:
402 case -ECONNRESET:
403 case -ENODEV:
404 case -ESHUTDOWN:
405 /* handle disconnect events*/
406 return;
407
408 default:
409 /* handle all other errors */
410 usb_anchor_urb(urb, &ar->rx_pool);
411 atomic_inc(&ar->rx_pool_urbs);
412 break;
413 }
414
415 err = carl9170_usb_submit_rx_urb(ar, GFP_ATOMIC);
416 if (unlikely(err)) {
417 /*
418 * usb_submit_rx_urb reported a problem.
419 * In case this is due to a rx buffer shortage,
420 * elevate the tasklet worker priority to
421 * the highest available level.
422 */
423 tasklet_hi_schedule(&ar->usb_tasklet);
424
425 if (atomic_read(&ar->rx_anch_urbs) == 0) {
426 /*
427 * The system is too slow to cope with
428 * the enormous workload. We have simply
429 * run out of active rx urbs and this
430 * unfortunatly leads to an unpredictable
431 * device.
432 */
433
434 carl9170_restart(ar, CARL9170_RR_SLOW_SYSTEM);
435 }
436 } else {
437 /*
438 * Using anything less than _high_ priority absolutely
439 * kills the rx performance my UP-System...
440 */
441 tasklet_hi_schedule(&ar->usb_tasklet);
442 }
443}
444
445static struct urb *carl9170_usb_alloc_rx_urb(struct ar9170 *ar, gfp_t gfp)
446{
447 struct urb *urb;
448 void *buf;
449
450 buf = kmalloc(ar->fw.rx_size, gfp);
451 if (!buf)
452 return NULL;
453
454 urb = usb_alloc_urb(0, gfp);
455 if (!urb) {
456 kfree(buf);
457 return NULL;
458 }
459
460 usb_fill_bulk_urb(urb, ar->udev, usb_rcvbulkpipe(ar->udev,
461 AR9170_USB_EP_RX), buf, ar->fw.rx_size,
462 carl9170_usb_rx_complete, ar);
463
464 urb->transfer_flags |= URB_FREE_BUFFER;
465
466 return urb;
467}
468
469static int carl9170_usb_send_rx_irq_urb(struct ar9170 *ar)
470{
471 struct urb *urb = NULL;
472 void *ibuf;
473 int err = -ENOMEM;
474
475 urb = usb_alloc_urb(0, GFP_KERNEL);
476 if (!urb)
477 goto out;
478
479 ibuf = kmalloc(AR9170_USB_EP_CTRL_MAX, GFP_KERNEL);
480 if (!ibuf)
481 goto out;
482
483 usb_fill_int_urb(urb, ar->udev, usb_rcvintpipe(ar->udev,
484 AR9170_USB_EP_IRQ), ibuf, AR9170_USB_EP_CTRL_MAX,
485 carl9170_usb_rx_irq_complete, ar, 1);
486
487 urb->transfer_flags |= URB_FREE_BUFFER;
488
489 usb_anchor_urb(urb, &ar->rx_anch);
490 err = usb_submit_urb(urb, GFP_KERNEL);
491 if (err)
492 usb_unanchor_urb(urb);
493
494out:
495 usb_free_urb(urb);
496 return err;
497}
498
499static int carl9170_usb_init_rx_bulk_urbs(struct ar9170 *ar)
500{
501 struct urb *urb;
502 int i, err = -EINVAL;
503
504 /*
505 * The driver actively maintains a second shadow
506 * pool for inactive, but fully-prepared rx urbs.
507 *
508 * The pool should help the driver to master huge
509 * workload spikes without running the risk of
510 * undersupplying the hardware or wasting time by
511 * processing rx data (streams) inside the urb
512 * completion (hardirq context).
513 */
514 for (i = 0; i < AR9170_NUM_RX_URBS_POOL; i++) {
515 urb = carl9170_usb_alloc_rx_urb(ar, GFP_KERNEL);
516 if (!urb) {
517 err = -ENOMEM;
518 goto err_out;
519 }
520
521 usb_anchor_urb(urb, &ar->rx_pool);
522 atomic_inc(&ar->rx_pool_urbs);
523 usb_free_urb(urb);
524 }
525
526 err = carl9170_usb_submit_rx_urb(ar, GFP_KERNEL);
527 if (err)
528 goto err_out;
529
530 /* the device now waiting for the firmware. */
531 carl9170_set_state_when(ar, CARL9170_STOPPED, CARL9170_IDLE);
532 return 0;
533
534err_out:
535
536 usb_scuttle_anchored_urbs(&ar->rx_pool);
537 usb_scuttle_anchored_urbs(&ar->rx_work);
538 usb_kill_anchored_urbs(&ar->rx_anch);
539 return err;
540}
541
542static int carl9170_usb_flush(struct ar9170 *ar)
543{
544 struct urb *urb;
545 int ret, err = 0;
546
547 while ((urb = usb_get_from_anchor(&ar->tx_wait))) {
548 struct sk_buff *skb = (void *)urb->context;
549 carl9170_tx_drop(ar, skb);
550 carl9170_tx_callback(ar, skb);
551 usb_free_urb(urb);
552 }
553
554 ret = usb_wait_anchor_empty_timeout(&ar->tx_cmd, HZ);
555 if (ret == 0)
556 err = -ETIMEDOUT;
557
558 /* lets wait a while until the tx - queues are dried out */
559 ret = usb_wait_anchor_empty_timeout(&ar->tx_anch, HZ);
560 if (ret == 0)
561 err = -ETIMEDOUT;
562
563 usb_kill_anchored_urbs(&ar->tx_anch);
564 carl9170_usb_handle_tx_err(ar);
565
566 return err;
567}
568
569static void carl9170_usb_cancel_urbs(struct ar9170 *ar)
570{
571 int err;
572
573 carl9170_set_state(ar, CARL9170_UNKNOWN_STATE);
574
575 err = carl9170_usb_flush(ar);
576 if (err)
577 dev_err(&ar->udev->dev, "stuck tx urbs!\n");
578
579 usb_poison_anchored_urbs(&ar->tx_anch);
580 carl9170_usb_handle_tx_err(ar);
581 usb_poison_anchored_urbs(&ar->rx_anch);
582
583 tasklet_kill(&ar->usb_tasklet);
584
585 usb_scuttle_anchored_urbs(&ar->rx_work);
586 usb_scuttle_anchored_urbs(&ar->rx_pool);
587 usb_scuttle_anchored_urbs(&ar->tx_cmd);
588}
589
590int __carl9170_exec_cmd(struct ar9170 *ar, struct carl9170_cmd *cmd,
591 const bool free_buf)
592{
593 struct urb *urb;
594
595 if (!IS_INITIALIZED(ar))
596 return -EPERM;
597
598 if (WARN_ON(cmd->hdr.len > CARL9170_MAX_CMD_LEN - 4))
599 return -EINVAL;
600
601 urb = usb_alloc_urb(0, GFP_ATOMIC);
602 if (!urb)
603 return -ENOMEM;
604
605 usb_fill_int_urb(urb, ar->udev, usb_sndintpipe(ar->udev,
606 AR9170_USB_EP_CMD), cmd, cmd->hdr.len + 4,
607 carl9170_usb_cmd_complete, ar, 1);
608
a84fab3c
CL		 609 if (free_buf)
610 urb->transfer_flags |= URB_FREE_BUFFER;
611
612 usb_anchor_urb(urb, &ar->tx_cmd);
613 usb_free_urb(urb);
614
615 return carl9170_usb_submit_cmd_urb(ar);
616}
617
618int carl9170_exec_cmd(struct ar9170 *ar, const enum carl9170_cmd_oids cmd,
619 unsigned int plen, void *payload, unsigned int outlen, void *out)
620{
621 int err = -ENOMEM;
622
623 if (!IS_ACCEPTING_CMD(ar))
624 return -EIO;
625
626 if (!(cmd & CARL9170_CMD_ASYNC_FLAG))
627 might_sleep();
628
629 ar->cmd.hdr.len = plen;
630 ar->cmd.hdr.cmd = cmd;
631 /* writing multiple regs fills this buffer already */
632 if (plen && payload != (u8 *)(ar->cmd.data))
633 memcpy(ar->cmd.data, payload, plen);
634
635 spin_lock_bh(&ar->cmd_lock);
636 ar->readbuf = (u8 *)out;
637 ar->readlen = outlen;
638 spin_unlock_bh(&ar->cmd_lock);
639
640 err = __carl9170_exec_cmd(ar, &ar->cmd, false);
641
642 if (!(cmd & CARL9170_CMD_ASYNC_FLAG)) {
643 err = wait_for_completion_timeout(&ar->cmd_wait, HZ);
644 if (err == 0) {
645 err = -ETIMEDOUT;
646 goto err_unbuf;
647 }
648
649 if (ar->readlen != outlen) {
650 err = -EMSGSIZE;
651 goto err_unbuf;
652 }
653 }
654
655 return 0;
656
657err_unbuf:
658 /* Maybe the device was removed in the moment we were waiting? */
659 if (IS_STARTED(ar)) {
660 dev_err(&ar->udev->dev, "no command feedback "
661 "received (%d).\n", err);
662
663 /* provide some maybe useful debug information */
664 print_hex_dump_bytes("carl9170 cmd: ", DUMP_PREFIX_NONE,
665 &ar->cmd, plen + 4);
666
667 carl9170_restart(ar, CARL9170_RR_COMMAND_TIMEOUT);
668 }
669
670 /* invalidate to avoid completing the next command prematurely */
671 spin_lock_bh(&ar->cmd_lock);
672 ar->readbuf = NULL;
673 ar->readlen = 0;
674 spin_unlock_bh(&ar->cmd_lock);
675
676 return err;
677}
678
679void carl9170_usb_tx(struct ar9170 *ar, struct sk_buff *skb)
680{
681 struct urb *urb;
682 struct ar9170_stream *tx_stream;
683 void *data;
684 unsigned int len;
685
686 if (!IS_STARTED(ar))
687 goto err_drop;
688
689 urb = usb_alloc_urb(0, GFP_ATOMIC);
690 if (!urb)
691 goto err_drop;
692
693 if (ar->fw.tx_stream) {
694 tx_stream = (void *) (skb->data - sizeof(*tx_stream));
695
696 len = skb->len + sizeof(*tx_stream);
697 tx_stream->length = cpu_to_le16(len);
698 tx_stream->tag = cpu_to_le16(AR9170_TX_STREAM_TAG);
699 data = tx_stream;
700 } else {
701 data = skb->data;
702 len = skb->len;
703 }
704
705 usb_fill_bulk_urb(urb, ar->udev, usb_sndbulkpipe(ar->udev,
706 AR9170_USB_EP_TX), data, len,
707 carl9170_usb_tx_data_complete, skb);
708
709 urb->transfer_flags |= URB_ZERO_PACKET;
710
711 usb_anchor_urb(urb, &ar->tx_wait);
712
713 usb_free_urb(urb);
714
715 carl9170_usb_submit_data_urb(ar);
716 return;
717
718err_drop:
719 carl9170_tx_drop(ar, skb);
720 carl9170_tx_callback(ar, skb);
721}
722
723static void carl9170_release_firmware(struct ar9170 *ar)
724{
725 if (ar->fw.fw) {
726 release_firmware(ar->fw.fw);
727 memset(&ar->fw, 0, sizeof(ar->fw));
728 }
729}
730
731void carl9170_usb_stop(struct ar9170 *ar)
732{
733 int ret;
734
735 carl9170_set_state_when(ar, CARL9170_IDLE, CARL9170_STOPPED);
736
737 ret = carl9170_usb_flush(ar);
738 if (ret)
739 dev_err(&ar->udev->dev, "kill pending tx urbs.\n");
740
741 usb_poison_anchored_urbs(&ar->tx_anch);
742 carl9170_usb_handle_tx_err(ar);
743
744 /* kill any pending command */
745 spin_lock_bh(&ar->cmd_lock);
746 ar->readlen = 0;
747 spin_unlock_bh(&ar->cmd_lock);
748 complete_all(&ar->cmd_wait);
749
750 /* This is required to prevent an early completion on _start */
751 INIT_COMPLETION(ar->cmd_wait);
752
753 /*
754 * Note:
755 * So far we freed all tx urbs, but we won't dare to touch any rx urbs.
756 * Else we would end up with a unresponsive device...
757 */
758}
759
760int carl9170_usb_open(struct ar9170 *ar)
761{
762 usb_unpoison_anchored_urbs(&ar->tx_anch);
763
764 carl9170_set_state_when(ar, CARL9170_STOPPED, CARL9170_IDLE);
765 return 0;
766}
767
768static int carl9170_usb_load_firmware(struct ar9170 *ar)
769{
770 const u8 *data;
771 u8 *buf;
772 unsigned int transfer;
773 size_t len;
774 u32 addr;
775 int err = 0;
776
777 buf = kmalloc(4096, GFP_KERNEL);
778 if (!buf) {
779 err = -ENOMEM;
780 goto err_out;
781 }
782
783 data = ar->fw.fw->data;
784 len = ar->fw.fw->size;
785 addr = ar->fw.address;
786
787 /* this removes the miniboot image */
788 data += ar->fw.offset;
789 len -= ar->fw.offset;
790
791 while (len) {
792 transfer = min_t(unsigned int, len, 4096u);
793 memcpy(buf, data, transfer);
794
795 err = usb_control_msg(ar->udev, usb_sndctrlpipe(ar->udev, 0),
796 0x30 /* FW DL */, 0x40 | USB_DIR_OUT,
797 addr >> 8, 0, buf, transfer, 100);
798
799 if (err < 0) {
800 kfree(buf);
801 goto err_out;
802 }
803
804 len -= transfer;
805 data += transfer;
806 addr += transfer;
807 }
808 kfree(buf);
809
810 err = usb_control_msg(ar->udev, usb_sndctrlpipe(ar->udev, 0),
811 0x31 /* FW DL COMPLETE */,
812 0x40 | USB_DIR_OUT, 0, 0, NULL, 0, 200);
813
814 if (wait_for_completion_timeout(&ar->fw_boot_wait, HZ) == 0) {
815 err = -ETIMEDOUT;
816 goto err_out;
817 }
818
819 err = carl9170_echo_test(ar, 0x4a110123);
820 if (err)
821 goto err_out;
822
823 /* firmware restarts cmd counter */
824 ar->cmd_seq = -1;
825
826 return 0;
827
828err_out:
829 dev_err(&ar->udev->dev, "firmware upload failed (%d).\n", err);
830 return err;
831}
832
833int carl9170_usb_restart(struct ar9170 *ar)
834{
835 int err = 0;
836
837 if (ar->intf->condition != USB_INTERFACE_BOUND)
838 return 0;
839
840 /* Disable command response sequence counter. */
841 ar->cmd_seq = -2;
842
843 err = carl9170_reboot(ar);
844
845 carl9170_usb_stop(ar);
846
a84fab3c
CL		 847 if (err)
848 goto err_out;
849
850 tasklet_schedule(&ar->usb_tasklet);
851
852 /* The reboot procedure can take quite a while to complete. */
853 msleep(1100);
854
855 err = carl9170_usb_open(ar);
856 if (err)
857 goto err_out;
858
859 err = carl9170_usb_load_firmware(ar);
860 if (err)
861 goto err_out;
862
863 return 0;
864
865err_out:
866 carl9170_usb_cancel_urbs(ar);
867 return err;
868}
869
870void carl9170_usb_reset(struct ar9170 *ar)
871{
872 /*
873 * This is the last resort to get the device going again
874 * without any *user replugging action*.
875 *
876 * But there is a catch: usb_reset really is like a physical
877 * *reconnect*. The mac80211 state will be lost in the process.
878 * Therefore a userspace application, which is monitoring
879 * the link must step in.
880 */
881 carl9170_usb_cancel_urbs(ar);
882
883 carl9170_usb_stop(ar);
884
885 usb_queue_reset_device(ar->intf);
886}
887
888static int carl9170_usb_init_device(struct ar9170 *ar)
889{
890 int err;
891
892 err = carl9170_usb_send_rx_irq_urb(ar);
893 if (err)
894 goto err_out;
895
896 err = carl9170_usb_init_rx_bulk_urbs(ar);
897 if (err)
898 goto err_unrx;
899
900 mutex_lock(&ar->mutex);
901 err = carl9170_usb_load_firmware(ar);
902 mutex_unlock(&ar->mutex);
903 if (err)
904 goto err_unrx;
905
906 return 0;
907
908err_unrx:
909 carl9170_usb_cancel_urbs(ar);
910
911err_out:
912 return err;
913}
914
915static void carl9170_usb_firmware_failed(struct ar9170 *ar)
916{
917 struct device *parent = ar->udev->dev.parent;
918 struct usb_device *udev;
919
920 /*
921 * Store a copy of the usb_device pointer locally.
922 * This is because device_release_driver initiates
923 * carl9170_usb_disconnect, which in turn frees our
924 * driver context (ar).
925 */
926 udev = ar->udev;
927
928 complete(&ar->fw_load_wait);
929
930 /* unbind anything failed */
931 if (parent)
932 device_lock(parent);
933
934 device_release_driver(&udev->dev);
935 if (parent)
936 device_unlock(parent);
937
938 usb_put_dev(udev);
939}
940
941static void carl9170_usb_firmware_finish(struct ar9170 *ar)
942{
943 int err;
944
945 err = carl9170_parse_firmware(ar);
946 if (err)
947 goto err_freefw;
948
949 err = carl9170_usb_init_device(ar);
950 if (err)
951 goto err_freefw;
952
953 err = carl9170_usb_open(ar);
954 if (err)
955 goto err_unrx;
956
957 err = carl9170_register(ar);
958
959 carl9170_usb_stop(ar);
960 if (err)
961 goto err_unrx;
962
963 complete(&ar->fw_load_wait);
964 usb_put_dev(ar->udev);
965 return;
966
967err_unrx:
968 carl9170_usb_cancel_urbs(ar);
969
970err_freefw:
971 carl9170_release_firmware(ar);
972 carl9170_usb_firmware_failed(ar);
973}
974
975static void carl9170_usb_firmware_step2(const struct firmware *fw,
976 void *context)
977{
978 struct ar9170 *ar = context;
979
980 if (fw) {
981 ar->fw.fw = fw;
982 carl9170_usb_firmware_finish(ar);
983 return;
984 }
985
986 dev_err(&ar->udev->dev, "firmware not found.\n");
987 carl9170_usb_firmware_failed(ar);
988}
989
990static int carl9170_usb_probe(struct usb_interface *intf,
991 const struct usb_device_id *id)
992{
993 struct ar9170 *ar;
994 struct usb_device *udev;
995 int err;
996
997 err = usb_reset_device(interface_to_usbdev(intf));
998 if (err)
999 return err;
1000
1001 ar = carl9170_alloc(sizeof(*ar));
1002 if (IS_ERR(ar))
1003 return PTR_ERR(ar);
1004
1005 udev = interface_to_usbdev(intf);
1006 usb_get_dev(udev);
1007 ar->udev = udev;
1008 ar->intf = intf;
1009 ar->features = id->driver_info;
1010
1011 usb_set_intfdata(intf, ar);
1012 SET_IEEE80211_DEV(ar->hw, &intf->dev);
1013
1014 init_usb_anchor(&ar->rx_anch);
1015 init_usb_anchor(&ar->rx_pool);
1016 init_usb_anchor(&ar->rx_work);
1017 init_usb_anchor(&ar->tx_wait);
1018 init_usb_anchor(&ar->tx_anch);
1019 init_usb_anchor(&ar->tx_cmd);
1020 init_usb_anchor(&ar->tx_err);
1021 init_completion(&ar->cmd_wait);
1022 init_completion(&ar->fw_boot_wait);
1023 init_completion(&ar->fw_load_wait);
1024 tasklet_init(&ar->usb_tasklet, carl9170_usb_tasklet,
1025 (unsigned long)ar);
1026
1027 atomic_set(&ar->tx_cmd_urbs, 0);
1028 atomic_set(&ar->tx_anch_urbs, 0);
1029 atomic_set(&ar->rx_work_urbs, 0);
1030 atomic_set(&ar->rx_anch_urbs, 0);
1031 atomic_set(&ar->rx_pool_urbs, 0);
1032 ar->cmd_seq = -2;
1033
1034 usb_get_dev(ar->udev);
1035
1036 carl9170_set_state(ar, CARL9170_STOPPED);
1037
1038 return request_firmware_nowait(THIS_MODULE, 1, CARL9170FW_NAME,
1039 &ar->udev->dev, GFP_KERNEL, ar, carl9170_usb_firmware_step2);
1040}
1041
1042static void carl9170_usb_disconnect(struct usb_interface *intf)
1043{
1044 struct ar9170 *ar = usb_get_intfdata(intf);
1045 struct usb_device *udev;
1046
1047 if (WARN_ON(!ar))
1048 return;
1049
1050 udev = ar->udev;
1051 wait_for_completion(&ar->fw_load_wait);
1052
1053 if (IS_INITIALIZED(ar)) {
1054 carl9170_reboot(ar);
1055 carl9170_usb_stop(ar);
1056 }
1057
1058 carl9170_usb_cancel_urbs(ar);
1059 carl9170_unregister(ar);
1060
1061 usb_set_intfdata(intf, NULL);
1062
1063 carl9170_release_firmware(ar);
1064 carl9170_free(ar);
1065 usb_put_dev(udev);
1066}
1067
1068#ifdef CONFIG_PM
1069static int carl9170_usb_suspend(struct usb_interface *intf,
1070 pm_message_t message)
1071{
1072 struct ar9170 *ar = usb_get_intfdata(intf);
1073
1074 if (!ar)
1075 return -ENODEV;
1076
1077 carl9170_usb_cancel_urbs(ar);
1078
1079 /*
1080 * firmware automatically reboots for usb suspend.
1081 */
1082
1083 return 0;
1084}
1085
1086static int carl9170_usb_resume(struct usb_interface *intf)
1087{
1088 struct ar9170 *ar = usb_get_intfdata(intf);
1089 int err;
1090
1091 if (!ar)
1092 return -ENODEV;
1093
1094 usb_unpoison_anchored_urbs(&ar->rx_anch);
1095
1096 err = carl9170_usb_init_device(ar);
1097 if (err)
1098 goto err_unrx;
1099
1100 err = carl9170_usb_open(ar);
1101 if (err)
1102 goto err_unrx;
1103
1104 return 0;
1105
1106err_unrx:
1107 carl9170_usb_cancel_urbs(ar);
1108
1109 return err;
1110}
1111#endif /* CONFIG_PM */
1112
1113static struct usb_driver carl9170_driver = {
1114 .name = KBUILD_MODNAME,
1115 .probe = carl9170_usb_probe,
1116 .disconnect = carl9170_usb_disconnect,
1117 .id_table = carl9170_usb_ids,
1118 .soft_unbind = 1,
1119#ifdef CONFIG_PM
1120 .suspend = carl9170_usb_suspend,
1121 .resume = carl9170_usb_resume,
1122#endif /* CONFIG_PM */
1123};
1124
1125static int __init carl9170_usb_init(void)
1126{
1127 return usb_register(&carl9170_driver);
1128}
1129
1130static void __exit carl9170_usb_exit(void)
1131{
1132 usb_deregister(&carl9170_driver);
1133}
1134
1135module_init(carl9170_usb_init);
1136module_exit(carl9170_usb_exit);
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