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[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 *entry_priv = 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          * Note that when the status is 0 it does not mean the
151          * frame was send out correctly. It only means the frame
152          * was succesfully pushed to the hardware, we have no
153          * way to determine the transmission status right now.
154          * (Only indirectly by looking at the failed TX counters
155          * in the register).
156          */
157         if (!urb->status)
158                 __set_bit(TXDONE_UNKNOWN, &txdesc.flags);
159         else
160                 __set_bit(TXDONE_FAILURE, &txdesc.flags);
161         txdesc.retry = 0;
162         txdesc.control = &entry_priv->control;
163
164         rt2x00lib_txdone(entry, &txdesc);
165
166         /*
167          * Make this entry available for reuse.
168          */
169         entry->flags = 0;
170         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
171
172         /*
173          * If the data queue was full before the txdone handler
174          * we must make sure the packet queue in the mac80211 stack
175          * is reenabled when the txdone handler has finished.
176          */
177         if (!rt2x00queue_full(entry->queue))
178                 ieee80211_wake_queue(rt2x00dev->hw, entry_priv->control.queue);
179 }
180
181 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
182                             struct data_queue *queue, struct sk_buff *skb,
183                             struct ieee80211_tx_control *control)
184 {
185         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
186         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
187         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
188         struct skb_frame_desc *skbdesc;
189         struct txentry_desc txdesc;
190         u32 length;
191
192         if (rt2x00queue_full(queue))
193                 return -EINVAL;
194
195         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
196                 ERROR(rt2x00dev,
197                       "Arrived at non-free entry in the non-full queue %d.\n"
198                       "Please file bug report to %s.\n",
199                       entry->queue->qid, DRV_PROJECT);
200                 return -EINVAL;
201         }
202
203         /*
204          * Copy all TX descriptor information into txdesc,
205          * after that we are free to use the skb->cb array
206          * for our information.
207          */
208         entry->skb = skb;
209         rt2x00queue_create_tx_descriptor(entry, &txdesc, control);
210
211         /*
212          * Add the descriptor in front of the skb.
213          */
214         skb_push(skb, queue->desc_size);
215         memset(skb->data, 0, queue->desc_size);
216
217         /*
218          * Fill in skb descriptor
219          */
220         skbdesc = get_skb_frame_desc(skb);
221         skbdesc->data = skb->data + queue->desc_size;
222         skbdesc->data_len = skb->len - queue->desc_size;
223         skbdesc->desc = skb->data;
224         skbdesc->desc_len = queue->desc_size;
225         skbdesc->entry = entry;
226
227         memcpy(&entry_priv->control, control, sizeof(entry_priv->control));
228         rt2x00queue_write_tx_descriptor(entry, &txdesc);
229
230         /*
231          * USB devices cannot blindly pass the skb->len as the
232          * length of the data to usb_fill_bulk_urb. Pass the skb
233          * to the driver to determine what the length should be.
234          */
235         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
236
237         /*
238          * Initialize URB and send the frame to the device.
239          */
240         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
241         usb_fill_bulk_urb(entry_priv->urb, usb_dev, usb_sndbulkpipe(usb_dev, 1),
242                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
243         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
244
245         rt2x00queue_index_inc(queue, Q_INDEX);
246
247         return 0;
248 }
249 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
250
251 /*
252  * RX data handlers.
253  */
254 static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
255 {
256         struct sk_buff *skb;
257         unsigned int frame_size;
258         unsigned int reserved_size;
259
260         /*
261          * The frame size includes descriptor size, because the
262          * hardware directly receive the frame into the skbuffer.
263          */
264         frame_size = queue->data_size + queue->desc_size;
265
266         /*
267          * For the allocation we should keep a few things in mind:
268          * 1) 4byte alignment of 802.11 payload
269          *
270          * For (1) we need at most 4 bytes to guarentee the correct
271          * alignment. We are going to optimize the fact that the chance
272          * that the 802.11 header_size % 4 == 2 is much bigger then
273          * anything else. However since we need to move the frame up
274          * to 3 bytes to the front, which means we need to preallocate
275          * 6 bytes.
276          */
277         reserved_size = 6;
278
279         /*
280          * Allocate skbuffer.
281          */
282         skb = dev_alloc_skb(frame_size + reserved_size);
283         if (!skb)
284                 return NULL;
285
286         skb_reserve(skb, reserved_size);
287         skb_put(skb, frame_size);
288
289         return skb;
290 }
291
292 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
293 {
294         struct queue_entry *entry = (struct queue_entry *)urb->context;
295         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
296         struct sk_buff *skb;
297         struct skb_frame_desc *skbdesc;
298         struct rxdone_entry_desc rxdesc;
299         unsigned int header_size;
300         unsigned int align;
301
302         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
303             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
304                 return;
305
306         /*
307          * Check if the received data is simply too small
308          * to be actually valid, or if the urb is signaling
309          * a problem.
310          */
311         if (urb->actual_length < entry->queue->desc_size || urb->status)
312                 goto skip_entry;
313
314         /*
315          * Fill in skb descriptor
316          */
317         skbdesc = get_skb_frame_desc(entry->skb);
318         memset(skbdesc, 0, sizeof(*skbdesc));
319         skbdesc->entry = entry;
320
321         memset(&rxdesc, 0, sizeof(rxdesc));
322         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
323
324         header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
325
326         /*
327          * The data behind the ieee80211 header must be
328          * aligned on a 4 byte boundary. We already reserved
329          * 2 bytes for header_size % 4 == 2 optimization.
330          * To determine the number of bytes which the data
331          * should be moved to the left, we must add these
332          * 2 bytes to the header_size.
333          */
334         align = (header_size + 2) % 4;
335
336         if (align) {
337                 skb_push(entry->skb, align);
338                 /* Move entire frame in 1 command */
339                 memmove(entry->skb->data, entry->skb->data + align,
340                         rxdesc.size);
341         }
342
343         /* Update data pointers, trim buffer to correct size */
344         skbdesc->data = entry->skb->data;
345         skb_trim(entry->skb, rxdesc.size);
346
347         /*
348          * Allocate a new sk buffer to replace the current one.
349          * If allocation fails, we should drop the current frame
350          * so we can recycle the existing sk buffer for the new frame.
351          */
352         skb = rt2x00usb_alloc_rxskb(entry->queue);
353         if (!skb)
354                 goto skip_entry;
355
356         /*
357          * Send the frame to rt2x00lib for further processing.
358          */
359         rt2x00lib_rxdone(entry, &rxdesc);
360
361         /*
362          * Replace current entry's skb with the newly allocated one,
363          * and reinitialize the urb.
364          */
365         entry->skb = skb;
366         urb->transfer_buffer = entry->skb->data;
367         urb->transfer_buffer_length = entry->skb->len;
368
369 skip_entry:
370         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
371                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
372                 usb_submit_urb(urb, GFP_ATOMIC);
373         }
374
375         rt2x00queue_index_inc(entry->queue, Q_INDEX);
376 }
377
378 /*
379  * Radio handlers
380  */
381 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
382 {
383         struct queue_entry_priv_usb *entry_priv;
384         struct queue_entry_priv_usb_bcn *bcn_priv;
385         unsigned int i;
386
387         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
388                                     REGISTER_TIMEOUT);
389
390         /*
391          * Cancel all queues.
392          */
393         for (i = 0; i < rt2x00dev->rx->limit; i++) {
394                 entry_priv = rt2x00dev->rx->entries[i].priv_data;
395                 usb_kill_urb(entry_priv->urb);
396         }
397
398         /*
399          * Kill guardian urb.
400          */
401         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
402                 bcn_priv = rt2x00dev->bcn->entries[i].priv_data;
403                 if (bcn_priv->guardian_urb)
404                         usb_kill_urb(bcn_priv->guardian_urb);
405         }
406 }
407 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
408
409 /*
410  * Device initialization handlers.
411  */
412 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
413                             struct queue_entry *entry)
414 {
415         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
416         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
417
418         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
419                           usb_rcvbulkpipe(usb_dev, 1),
420                           entry->skb->data, entry->skb->len,
421                           rt2x00usb_interrupt_rxdone, entry);
422
423         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
424         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
425 }
426 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
427
428 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
429                             struct queue_entry *entry)
430 {
431         entry->flags = 0;
432 }
433 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
434
435 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
436                                struct data_queue *queue)
437 {
438         struct queue_entry_priv_usb *entry_priv;
439         struct queue_entry_priv_usb_bcn *bcn_priv;
440         unsigned int i;
441
442         for (i = 0; i < queue->limit; i++) {
443                 entry_priv = queue->entries[i].priv_data;
444                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
445                 if (!entry_priv->urb)
446                         return -ENOMEM;
447         }
448
449         /*
450          * If this is not the beacon queue or
451          * no guardian byte was required for the beacon,
452          * then we are done.
453          */
454         if (rt2x00dev->bcn != queue ||
455             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
456                 return 0;
457
458         for (i = 0; i < queue->limit; i++) {
459                 bcn_priv = queue->entries[i].priv_data;
460                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
461                 if (!bcn_priv->guardian_urb)
462                         return -ENOMEM;
463         }
464
465         return 0;
466 }
467
468 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
469                                struct data_queue *queue)
470 {
471         struct queue_entry_priv_usb *entry_priv;
472         struct queue_entry_priv_usb_bcn *bcn_priv;
473         unsigned int i;
474
475         if (!queue->entries)
476                 return;
477
478         for (i = 0; i < queue->limit; i++) {
479                 entry_priv = queue->entries[i].priv_data;
480                 usb_kill_urb(entry_priv->urb);
481                 usb_free_urb(entry_priv->urb);
482                 if (queue->entries[i].skb)
483                         kfree_skb(queue->entries[i].skb);
484         }
485
486         /*
487          * If this is not the beacon queue or
488          * no guardian byte was required for the beacon,
489          * then we are done.
490          */
491         if (rt2x00dev->bcn != queue ||
492             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
493                 return;
494
495         for (i = 0; i < queue->limit; i++) {
496                 bcn_priv = queue->entries[i].priv_data;
497                 usb_kill_urb(bcn_priv->guardian_urb);
498                 usb_free_urb(bcn_priv->guardian_urb);
499         }
500 }
501
502 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
503 {
504         struct data_queue *queue;
505         struct sk_buff *skb;
506         unsigned int entry_size;
507         unsigned int i;
508         int uninitialized_var(status);
509
510         /*
511          * Allocate DMA
512          */
513         queue_for_each(rt2x00dev, queue) {
514                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
515                 if (status)
516                         goto exit;
517         }
518
519         /*
520          * For the RX queue, skb's should be allocated.
521          */
522         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
523         for (i = 0; i < rt2x00dev->rx->limit; i++) {
524                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
525                 if (!skb)
526                         goto exit;
527
528                 rt2x00dev->rx->entries[i].skb = skb;
529         }
530
531         return 0;
532
533 exit:
534         rt2x00usb_uninitialize(rt2x00dev);
535
536         return status;
537 }
538 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
539
540 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
541 {
542         struct data_queue *queue;
543
544         queue_for_each(rt2x00dev, queue)
545                 rt2x00usb_free_urb(rt2x00dev, queue);
546 }
547 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
548
549 /*
550  * USB driver handlers.
551  */
552 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
553 {
554         kfree(rt2x00dev->rf);
555         rt2x00dev->rf = NULL;
556
557         kfree(rt2x00dev->eeprom);
558         rt2x00dev->eeprom = NULL;
559
560         kfree(rt2x00dev->csr.cache);
561         rt2x00dev->csr.cache = NULL;
562 }
563
564 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
565 {
566         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
567         if (!rt2x00dev->csr.cache)
568                 goto exit;
569
570         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
571         if (!rt2x00dev->eeprom)
572                 goto exit;
573
574         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
575         if (!rt2x00dev->rf)
576                 goto exit;
577
578         return 0;
579
580 exit:
581         ERROR_PROBE("Failed to allocate registers.\n");
582
583         rt2x00usb_free_reg(rt2x00dev);
584
585         return -ENOMEM;
586 }
587
588 int rt2x00usb_probe(struct usb_interface *usb_intf,
589                     const struct usb_device_id *id)
590 {
591         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
592         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
593         struct ieee80211_hw *hw;
594         struct rt2x00_dev *rt2x00dev;
595         int retval;
596
597         usb_dev = usb_get_dev(usb_dev);
598
599         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
600         if (!hw) {
601                 ERROR_PROBE("Failed to allocate hardware.\n");
602                 retval = -ENOMEM;
603                 goto exit_put_device;
604         }
605
606         usb_set_intfdata(usb_intf, hw);
607
608         rt2x00dev = hw->priv;
609         rt2x00dev->dev = usb_intf;
610         rt2x00dev->ops = ops;
611         rt2x00dev->hw = hw;
612         mutex_init(&rt2x00dev->usb_cache_mutex);
613
614         rt2x00dev->usb_maxpacket =
615             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
616         if (!rt2x00dev->usb_maxpacket)
617                 rt2x00dev->usb_maxpacket = 1;
618
619         retval = rt2x00usb_alloc_reg(rt2x00dev);
620         if (retval)
621                 goto exit_free_device;
622
623         retval = rt2x00lib_probe_dev(rt2x00dev);
624         if (retval)
625                 goto exit_free_reg;
626
627         return 0;
628
629 exit_free_reg:
630         rt2x00usb_free_reg(rt2x00dev);
631
632 exit_free_device:
633         ieee80211_free_hw(hw);
634
635 exit_put_device:
636         usb_put_dev(usb_dev);
637
638         usb_set_intfdata(usb_intf, NULL);
639
640         return retval;
641 }
642 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
643
644 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
645 {
646         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
647         struct rt2x00_dev *rt2x00dev = hw->priv;
648
649         /*
650          * Free all allocated data.
651          */
652         rt2x00lib_remove_dev(rt2x00dev);
653         rt2x00usb_free_reg(rt2x00dev);
654         ieee80211_free_hw(hw);
655
656         /*
657          * Free the USB device data.
658          */
659         usb_set_intfdata(usb_intf, NULL);
660         usb_put_dev(interface_to_usbdev(usb_intf));
661 }
662 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
663
664 #ifdef CONFIG_PM
665 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
666 {
667         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
668         struct rt2x00_dev *rt2x00dev = hw->priv;
669         int retval;
670
671         retval = rt2x00lib_suspend(rt2x00dev, state);
672         if (retval)
673                 return retval;
674
675         rt2x00usb_free_reg(rt2x00dev);
676
677         /*
678          * Decrease usbdev refcount.
679          */
680         usb_put_dev(interface_to_usbdev(usb_intf));
681
682         return 0;
683 }
684 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
685
686 int rt2x00usb_resume(struct usb_interface *usb_intf)
687 {
688         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
689         struct rt2x00_dev *rt2x00dev = hw->priv;
690         int retval;
691
692         usb_get_dev(interface_to_usbdev(usb_intf));
693
694         retval = rt2x00usb_alloc_reg(rt2x00dev);
695         if (retval)
696                 return retval;
697
698         retval = rt2x00lib_resume(rt2x00dev);
699         if (retval)
700                 goto exit_free_reg;
701
702         return 0;
703
704 exit_free_reg:
705         rt2x00usb_free_reg(rt2x00dev);
706
707         return retval;
708 }
709 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
710 #endif /* CONFIG_PM */
711
712 /*
713  * rt2x00usb module information.
714  */
715 MODULE_AUTHOR(DRV_PROJECT);
716 MODULE_VERSION(DRV_VERSION);
717 MODULE_DESCRIPTION("rt2x00 usb library");
718 MODULE_LICENSE("GPL");