Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...
[linux-2.6] / drivers / net / wireless / rt2x00 / rt2x00usb.c
1 /*
2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3         <http://rt2x00.serialmonkey.com>
4
5         This program is free software; you can redistribute it and/or modify
6         it under the terms of the GNU General Public License as published by
7         the Free Software Foundation; either version 2 of the License, or
8         (at your option) any later version.
9
10         This program is distributed in the hope that it will be useful,
11         but WITHOUT ANY WARRANTY; without even the implied warranty of
12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13         GNU General Public License for more details.
14
15         You should have received a copy of the GNU General Public License
16         along with this program; if not, write to the
17         Free Software Foundation, Inc.,
18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 /*
22         Module: rt2x00usb
23         Abstract: rt2x00 generic usb device routines.
24  */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/usb.h>
29 #include <linux/bug.h>
30
31 #include "rt2x00.h"
32 #include "rt2x00usb.h"
33
34 /*
35  * Interfacing with the HW.
36  */
37 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
38                              const u8 request, const u8 requesttype,
39                              const u16 offset, const u16 value,
40                              void *buffer, const u16 buffer_length,
41                              const int timeout)
42 {
43         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
44         int status;
45         unsigned int i;
46         unsigned int pipe =
47             (requesttype == USB_VENDOR_REQUEST_IN) ?
48             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
49
50
51         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
52                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
53                                          value, offset, buffer, buffer_length,
54                                          timeout);
55                 if (status >= 0)
56                         return 0;
57
58                 /*
59                  * Check for errors
60                  * -ENODEV: Device has disappeared, no point continuing.
61                  * All other errors: Try again.
62                  */
63                 else if (status == -ENODEV)
64                         break;
65         }
66
67         ERROR(rt2x00dev,
68               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
69               request, offset, status);
70
71         return status;
72 }
73 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
74
75 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
76                                    const u8 request, const u8 requesttype,
77                                    const u16 offset, void *buffer,
78                                    const u16 buffer_length, const int timeout)
79 {
80         int status;
81
82         BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
83
84         /*
85          * Check for Cache availability.
86          */
87         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
88                 ERROR(rt2x00dev, "CSR cache not available.\n");
89                 return -ENOMEM;
90         }
91
92         if (requesttype == USB_VENDOR_REQUEST_OUT)
93                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
94
95         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
96                                           offset, 0, rt2x00dev->csr.cache,
97                                           buffer_length, timeout);
98
99         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
100                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
101
102         return status;
103 }
104 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
105
106 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
107                                   const u8 request, const u8 requesttype,
108                                   const u16 offset, void *buffer,
109                                   const u16 buffer_length, const int timeout)
110 {
111         int status;
112
113         mutex_lock(&rt2x00dev->usb_cache_mutex);
114
115         status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
116                                                 requesttype, offset, buffer,
117                                                 buffer_length, timeout);
118
119         mutex_unlock(&rt2x00dev->usb_cache_mutex);
120
121         return status;
122 }
123 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
124
125 /*
126  * TX data handlers.
127  */
128 static void rt2x00usb_interrupt_txdone(struct urb *urb)
129 {
130         struct queue_entry *entry = (struct queue_entry *)urb->context;
131         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
132         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
133         struct txdone_entry_desc txdesc;
134         __le32 *txd = (__le32 *)entry->skb->data;
135         u32 word;
136
137         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
138             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
139                 return;
140
141         rt2x00_desc_read(txd, 0, &word);
142
143         /*
144          * Remove the descriptor data from the buffer.
145          */
146         skb_pull(entry->skb, entry->queue->desc_size);
147
148         /*
149          * Obtain the status about this packet.
150          */
151         txdesc.status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
152         txdesc.retry = 0;
153         txdesc.control = &priv_tx->control;
154
155         rt2x00lib_txdone(entry, &txdesc);
156
157         /*
158          * Make this entry available for reuse.
159          */
160         entry->flags = 0;
161         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
162
163         /*
164          * If the data queue was full before the txdone handler
165          * we must make sure the packet queue in the mac80211 stack
166          * is reenabled when the txdone handler has finished.
167          */
168         if (!rt2x00queue_full(entry->queue))
169                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
170 }
171
172 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
173                             struct data_queue *queue, struct sk_buff *skb,
174                             struct ieee80211_tx_control *control)
175 {
176         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
177         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
178         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
179         struct skb_frame_desc *skbdesc;
180         u32 length;
181
182         if (rt2x00queue_full(queue))
183                 return -EINVAL;
184
185         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
186                 ERROR(rt2x00dev,
187                       "Arrived at non-free entry in the non-full queue %d.\n"
188                       "Please file bug report to %s.\n",
189                       control->queue, DRV_PROJECT);
190                 return -EINVAL;
191         }
192
193         /*
194          * Add the descriptor in front of the skb.
195          */
196         skb_push(skb, queue->desc_size);
197         memset(skb->data, 0, queue->desc_size);
198
199         /*
200          * Fill in skb descriptor
201          */
202         skbdesc = get_skb_frame_desc(skb);
203         skbdesc->data = skb->data + queue->desc_size;
204         skbdesc->data_len = skb->len - queue->desc_size;
205         skbdesc->desc = skb->data;
206         skbdesc->desc_len = queue->desc_size;
207         skbdesc->entry = entry;
208
209         memcpy(&priv_tx->control, control, sizeof(priv_tx->control));
210         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
211
212         /*
213          * USB devices cannot blindly pass the skb->len as the
214          * length of the data to usb_fill_bulk_urb. Pass the skb
215          * to the driver to determine what the length should be.
216          */
217         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
218
219         /*
220          * Initialize URB and send the frame to the device.
221          */
222         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
223         usb_fill_bulk_urb(priv_tx->urb, usb_dev, usb_sndbulkpipe(usb_dev, 1),
224                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
225         usb_submit_urb(priv_tx->urb, GFP_ATOMIC);
226
227         rt2x00queue_index_inc(queue, Q_INDEX);
228
229         return 0;
230 }
231 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
232
233 /*
234  * RX data handlers.
235  */
236 static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
237 {
238         struct sk_buff *skb;
239         unsigned int frame_size;
240
241         /*
242          * As alignment we use 2 and not NET_IP_ALIGN because we need
243          * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
244          * can be 0 on some hardware). We use these 2 bytes for frame
245          * alignment later, we assume that the chance that
246          * header_size % 4 == 2 is bigger then header_size % 2 == 0
247          * and thus optimize alignment by reserving the 2 bytes in
248          * advance.
249          */
250         frame_size = queue->data_size + queue->desc_size;
251         skb = dev_alloc_skb(queue->desc_size + frame_size + 2);
252         if (!skb)
253                 return NULL;
254
255         skb_reserve(skb, queue->desc_size + 2);
256         skb_put(skb, frame_size);
257
258         return skb;
259 }
260
261 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
262 {
263         struct queue_entry *entry = (struct queue_entry *)urb->context;
264         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
265         struct sk_buff *skb;
266         struct skb_frame_desc *skbdesc;
267         struct rxdone_entry_desc rxdesc;
268         int header_size;
269
270         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
271             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
272                 return;
273
274         /*
275          * Check if the received data is simply too small
276          * to be actually valid, or if the urb is signaling
277          * a problem.
278          */
279         if (urb->actual_length < entry->queue->desc_size || urb->status)
280                 goto skip_entry;
281
282         /*
283          * Fill in skb descriptor
284          */
285         skbdesc = get_skb_frame_desc(entry->skb);
286         memset(skbdesc, 0, sizeof(*skbdesc));
287         skbdesc->entry = entry;
288
289         memset(&rxdesc, 0, sizeof(rxdesc));
290         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
291
292         /*
293          * The data behind the ieee80211 header must be
294          * aligned on a 4 byte boundary.
295          */
296         header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
297         if (header_size % 4 == 0) {
298                 skb_push(entry->skb, 2);
299                 memmove(entry->skb->data, entry->skb->data + 2,
300                         entry->skb->len - 2);
301                 skbdesc->data = entry->skb->data;
302                 skb_trim(entry->skb,entry->skb->len - 2);
303         }
304
305         /*
306          * Allocate a new sk buffer to replace the current one.
307          * If allocation fails, we should drop the current frame
308          * so we can recycle the existing sk buffer for the new frame.
309          */
310         skb = rt2x00usb_alloc_rxskb(entry->queue);
311         if (!skb)
312                 goto skip_entry;
313
314         /*
315          * Send the frame to rt2x00lib for further processing.
316          */
317         rt2x00lib_rxdone(entry, &rxdesc);
318
319         /*
320          * Replace current entry's skb with the newly allocated one,
321          * and reinitialize the urb.
322          */
323         entry->skb = skb;
324         urb->transfer_buffer = entry->skb->data;
325         urb->transfer_buffer_length = entry->skb->len;
326
327 skip_entry:
328         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
329                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
330                 usb_submit_urb(urb, GFP_ATOMIC);
331         }
332
333         rt2x00queue_index_inc(entry->queue, Q_INDEX);
334 }
335
336 /*
337  * Radio handlers
338  */
339 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
340 {
341         struct queue_entry_priv_usb_rx *priv_rx;
342         struct queue_entry_priv_usb_tx *priv_tx;
343         struct queue_entry_priv_usb_bcn *priv_bcn;
344         struct data_queue *queue;
345         unsigned int i;
346
347         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
348                                     REGISTER_TIMEOUT);
349
350         /*
351          * Cancel all queues.
352          */
353         for (i = 0; i < rt2x00dev->rx->limit; i++) {
354                 priv_rx = rt2x00dev->rx->entries[i].priv_data;
355                 usb_kill_urb(priv_rx->urb);
356         }
357
358         tx_queue_for_each(rt2x00dev, queue) {
359                 for (i = 0; i < queue->limit; i++) {
360                         priv_tx = queue->entries[i].priv_data;
361                         usb_kill_urb(priv_tx->urb);
362                 }
363         }
364
365         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
366                 priv_bcn = rt2x00dev->bcn->entries[i].priv_data;
367                 usb_kill_urb(priv_bcn->urb);
368
369                 if (priv_bcn->guardian_urb)
370                         usb_kill_urb(priv_bcn->guardian_urb);
371         }
372
373         if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
374                 return;
375
376         for (i = 0; i < rt2x00dev->bcn[1].limit; i++) {
377                 priv_tx = rt2x00dev->bcn[1].entries[i].priv_data;
378                 usb_kill_urb(priv_tx->urb);
379         }
380 }
381 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
382
383 /*
384  * Device initialization handlers.
385  */
386 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
387                             struct queue_entry *entry)
388 {
389         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
390         struct queue_entry_priv_usb_rx *priv_rx = entry->priv_data;
391
392         usb_fill_bulk_urb(priv_rx->urb, usb_dev,
393                           usb_rcvbulkpipe(usb_dev, 1),
394                           entry->skb->data, entry->skb->len,
395                           rt2x00usb_interrupt_rxdone, entry);
396
397         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
398         usb_submit_urb(priv_rx->urb, GFP_ATOMIC);
399 }
400 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
401
402 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
403                             struct queue_entry *entry)
404 {
405         entry->flags = 0;
406 }
407 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
408
409 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
410                                struct data_queue *queue)
411 {
412         struct queue_entry_priv_usb_rx *priv_rx;
413         struct queue_entry_priv_usb_tx *priv_tx;
414         struct queue_entry_priv_usb_bcn *priv_bcn;
415         struct urb *urb;
416         unsigned int guardian =
417             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
418         unsigned int i;
419
420         /*
421          * Allocate the URB's
422          */
423         for (i = 0; i < queue->limit; i++) {
424                 urb = usb_alloc_urb(0, GFP_KERNEL);
425                 if (!urb)
426                         return -ENOMEM;
427
428                 if (queue->qid == QID_RX) {
429                         priv_rx = queue->entries[i].priv_data;
430                         priv_rx->urb = urb;
431                 } else if (queue->qid == QID_MGMT && guardian) {
432                         priv_bcn = queue->entries[i].priv_data;
433                         priv_bcn->urb = urb;
434
435                         urb = usb_alloc_urb(0, GFP_KERNEL);
436                         if (!urb)
437                                 return -ENOMEM;
438
439                         priv_bcn->guardian_urb = urb;
440                 } else {
441                         priv_tx = queue->entries[i].priv_data;
442                         priv_tx->urb = urb;
443                 }
444         }
445
446         return 0;
447 }
448
449 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
450                                struct data_queue *queue)
451 {
452         struct queue_entry_priv_usb_rx *priv_rx;
453         struct queue_entry_priv_usb_tx *priv_tx;
454         struct queue_entry_priv_usb_bcn *priv_bcn;
455         struct urb *urb;
456         unsigned int guardian =
457             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
458         unsigned int i;
459
460         if (!queue->entries)
461                 return;
462
463         for (i = 0; i < queue->limit; i++) {
464                 if (queue->qid == QID_RX) {
465                         priv_rx = queue->entries[i].priv_data;
466                         urb = priv_rx->urb;
467                 } else if (queue->qid == QID_MGMT && guardian) {
468                         priv_bcn = queue->entries[i].priv_data;
469
470                         usb_kill_urb(priv_bcn->guardian_urb);
471                         usb_free_urb(priv_bcn->guardian_urb);
472
473                         urb = priv_bcn->urb;
474                 } else {
475                         priv_tx = queue->entries[i].priv_data;
476                         urb = priv_tx->urb;
477                 }
478
479                 usb_kill_urb(urb);
480                 usb_free_urb(urb);
481                 if (queue->entries[i].skb)
482                         kfree_skb(queue->entries[i].skb);
483         }
484 }
485
486 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
487 {
488         struct data_queue *queue;
489         struct sk_buff *skb;
490         unsigned int entry_size;
491         unsigned int i;
492         int uninitialized_var(status);
493
494         /*
495          * Allocate DMA
496          */
497         queue_for_each(rt2x00dev, queue) {
498                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
499                 if (status)
500                         goto exit;
501         }
502
503         /*
504          * For the RX queue, skb's should be allocated.
505          */
506         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
507         for (i = 0; i < rt2x00dev->rx->limit; i++) {
508                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
509                 if (!skb)
510                         goto exit;
511
512                 rt2x00dev->rx->entries[i].skb = skb;
513         }
514
515         return 0;
516
517 exit:
518         rt2x00usb_uninitialize(rt2x00dev);
519
520         return status;
521 }
522 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
523
524 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
525 {
526         struct data_queue *queue;
527
528         queue_for_each(rt2x00dev, queue)
529                 rt2x00usb_free_urb(rt2x00dev, queue);
530 }
531 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
532
533 /*
534  * USB driver handlers.
535  */
536 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
537 {
538         kfree(rt2x00dev->rf);
539         rt2x00dev->rf = NULL;
540
541         kfree(rt2x00dev->eeprom);
542         rt2x00dev->eeprom = NULL;
543
544         kfree(rt2x00dev->csr.cache);
545         rt2x00dev->csr.cache = NULL;
546 }
547
548 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
549 {
550         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
551         if (!rt2x00dev->csr.cache)
552                 goto exit;
553
554         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
555         if (!rt2x00dev->eeprom)
556                 goto exit;
557
558         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
559         if (!rt2x00dev->rf)
560                 goto exit;
561
562         return 0;
563
564 exit:
565         ERROR_PROBE("Failed to allocate registers.\n");
566
567         rt2x00usb_free_reg(rt2x00dev);
568
569         return -ENOMEM;
570 }
571
572 int rt2x00usb_probe(struct usb_interface *usb_intf,
573                     const struct usb_device_id *id)
574 {
575         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
576         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
577         struct ieee80211_hw *hw;
578         struct rt2x00_dev *rt2x00dev;
579         int retval;
580
581         usb_dev = usb_get_dev(usb_dev);
582
583         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
584         if (!hw) {
585                 ERROR_PROBE("Failed to allocate hardware.\n");
586                 retval = -ENOMEM;
587                 goto exit_put_device;
588         }
589
590         usb_set_intfdata(usb_intf, hw);
591
592         rt2x00dev = hw->priv;
593         rt2x00dev->dev = usb_intf;
594         rt2x00dev->ops = ops;
595         rt2x00dev->hw = hw;
596         mutex_init(&rt2x00dev->usb_cache_mutex);
597
598         rt2x00dev->usb_maxpacket =
599             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
600         if (!rt2x00dev->usb_maxpacket)
601                 rt2x00dev->usb_maxpacket = 1;
602
603         retval = rt2x00usb_alloc_reg(rt2x00dev);
604         if (retval)
605                 goto exit_free_device;
606
607         retval = rt2x00lib_probe_dev(rt2x00dev);
608         if (retval)
609                 goto exit_free_reg;
610
611         return 0;
612
613 exit_free_reg:
614         rt2x00usb_free_reg(rt2x00dev);
615
616 exit_free_device:
617         ieee80211_free_hw(hw);
618
619 exit_put_device:
620         usb_put_dev(usb_dev);
621
622         usb_set_intfdata(usb_intf, NULL);
623
624         return retval;
625 }
626 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
627
628 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
629 {
630         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
631         struct rt2x00_dev *rt2x00dev = hw->priv;
632
633         /*
634          * Free all allocated data.
635          */
636         rt2x00lib_remove_dev(rt2x00dev);
637         rt2x00usb_free_reg(rt2x00dev);
638         ieee80211_free_hw(hw);
639
640         /*
641          * Free the USB device data.
642          */
643         usb_set_intfdata(usb_intf, NULL);
644         usb_put_dev(interface_to_usbdev(usb_intf));
645 }
646 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
647
648 #ifdef CONFIG_PM
649 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
650 {
651         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
652         struct rt2x00_dev *rt2x00dev = hw->priv;
653         int retval;
654
655         retval = rt2x00lib_suspend(rt2x00dev, state);
656         if (retval)
657                 return retval;
658
659         rt2x00usb_free_reg(rt2x00dev);
660
661         /*
662          * Decrease usbdev refcount.
663          */
664         usb_put_dev(interface_to_usbdev(usb_intf));
665
666         return 0;
667 }
668 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
669
670 int rt2x00usb_resume(struct usb_interface *usb_intf)
671 {
672         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
673         struct rt2x00_dev *rt2x00dev = hw->priv;
674         int retval;
675
676         usb_get_dev(interface_to_usbdev(usb_intf));
677
678         retval = rt2x00usb_alloc_reg(rt2x00dev);
679         if (retval)
680                 return retval;
681
682         retval = rt2x00lib_resume(rt2x00dev);
683         if (retval)
684                 goto exit_free_reg;
685
686         return 0;
687
688 exit_free_reg:
689         rt2x00usb_free_reg(rt2x00dev);
690
691         return retval;
692 }
693 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
694 #endif /* CONFIG_PM */
695
696 /*
697  * rt2x00usb module information.
698  */
699 MODULE_AUTHOR(DRV_PROJECT);
700 MODULE_VERSION(DRV_VERSION);
701 MODULE_DESCRIPTION("rt2x00 usb library");
702 MODULE_LICENSE("GPL");