rt2x00: Don't kick TX queue after each frame
[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 txdone_entry_desc txdesc;
133         enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
134
135         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
136             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
137                 return;
138
139         /*
140          * Remove the descriptor data from the buffer.
141          */
142         skb_pull(entry->skb, entry->queue->desc_size);
143
144         /*
145          * Obtain the status about this packet.
146          * Note that when the status is 0 it does not mean the
147          * frame was send out correctly. It only means the frame
148          * was succesfully pushed to the hardware, we have no
149          * way to determine the transmission status right now.
150          * (Only indirectly by looking at the failed TX counters
151          * in the register).
152          */
153         if (!urb->status)
154                 __set_bit(TXDONE_UNKNOWN, &txdesc.flags);
155         else
156                 __set_bit(TXDONE_FAILURE, &txdesc.flags);
157         txdesc.retry = 0;
158
159         rt2x00lib_txdone(entry, &txdesc);
160
161         /*
162          * Make this entry available for reuse.
163          */
164         entry->flags = 0;
165         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
166
167         /*
168          * If the data queue was below the threshold before the txdone
169          * handler we must make sure the packet queue in the mac80211 stack
170          * is reenabled when the txdone handler has finished.
171          */
172         if (!rt2x00queue_threshold(entry->queue))
173                 ieee80211_wake_queue(rt2x00dev->hw, qid);
174 }
175
176 int rt2x00usb_write_tx_data(struct queue_entry *entry)
177 {
178         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
179         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
180         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
181         struct skb_frame_desc *skbdesc;
182         u32 length;
183
184         /*
185          * Add the descriptor in front of the skb.
186          */
187         skb_push(entry->skb, entry->queue->desc_size);
188         memset(entry->skb->data, 0, entry->queue->desc_size);
189
190         /*
191          * Fill in skb descriptor
192          */
193         skbdesc = get_skb_frame_desc(entry->skb);
194         memset(skbdesc, 0, sizeof(*skbdesc));
195         skbdesc->data = entry->skb->data + entry->queue->desc_size;
196         skbdesc->data_len = entry->skb->len - entry->queue->desc_size;
197         skbdesc->desc = entry->skb->data;
198         skbdesc->desc_len = entry->queue->desc_size;
199         skbdesc->entry = entry;
200
201         /*
202          * USB devices cannot blindly pass the skb->len as the
203          * length of the data to usb_fill_bulk_urb. Pass the skb
204          * to the driver to determine what the length should be.
205          */
206         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, entry->skb);
207
208         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
209                           usb_sndbulkpipe(usb_dev, 1),
210                           entry->skb->data, length,
211                           rt2x00usb_interrupt_txdone, entry);
212
213         return 0;
214 }
215 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
216
217 static inline void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
218 {
219         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
220
221         if (__test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
222                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
223 }
224
225 void rt2x00usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
226                              const enum data_queue_qid qid)
227 {
228         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, qid);
229         unsigned long irqflags;
230         unsigned int index;
231         unsigned int index_done;
232         unsigned int i;
233
234         /*
235          * Only protect the range we are going to loop over,
236          * if during our loop a extra entry is set to pending
237          * it should not be kicked during this run, since it
238          * is part of another TX operation.
239          */
240         spin_lock_irqsave(&queue->lock, irqflags);
241         index = queue->index[Q_INDEX];
242         index_done = queue->index[Q_INDEX_DONE];
243         spin_unlock_irqrestore(&queue->lock, irqflags);
244
245         /*
246          * Start from the TX done pointer, this guarentees that we will
247          * send out all frames in the correct order.
248          */
249         if (index_done < index) {
250                 for (i = index_done; i < index; i++)
251                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
252         } else {
253                 for (i = index_done; i < queue->limit; i++)
254                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
255
256                 for (i = 0; i < index; i++)
257                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
258         }
259 }
260 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
261
262 /*
263  * RX data handlers.
264  */
265 static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
266 {
267         struct sk_buff *skb;
268         unsigned int frame_size;
269         unsigned int reserved_size;
270
271         /*
272          * The frame size includes descriptor size, because the
273          * hardware directly receive the frame into the skbuffer.
274          */
275         frame_size = queue->data_size + queue->desc_size;
276
277         /*
278          * For the allocation we should keep a few things in mind:
279          * 1) 4byte alignment of 802.11 payload
280          *
281          * For (1) we need at most 4 bytes to guarentee the correct
282          * alignment. We are going to optimize the fact that the chance
283          * that the 802.11 header_size % 4 == 2 is much bigger then
284          * anything else. However since we need to move the frame up
285          * to 3 bytes to the front, which means we need to preallocate
286          * 6 bytes.
287          */
288         reserved_size = 6;
289
290         /*
291          * Allocate skbuffer.
292          */
293         skb = dev_alloc_skb(frame_size + reserved_size);
294         if (!skb)
295                 return NULL;
296
297         skb_reserve(skb, reserved_size);
298         skb_put(skb, frame_size);
299
300         return skb;
301 }
302
303 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
304 {
305         struct queue_entry *entry = (struct queue_entry *)urb->context;
306         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
307         struct sk_buff *skb;
308         struct skb_frame_desc *skbdesc;
309         struct rxdone_entry_desc rxdesc;
310         unsigned int header_size;
311         unsigned int align;
312
313         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
314             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
315                 return;
316
317         /*
318          * Check if the received data is simply too small
319          * to be actually valid, or if the urb is signaling
320          * a problem.
321          */
322         if (urb->actual_length < entry->queue->desc_size || urb->status)
323                 goto skip_entry;
324
325         /*
326          * Fill in skb descriptor
327          */
328         skbdesc = get_skb_frame_desc(entry->skb);
329         memset(skbdesc, 0, sizeof(*skbdesc));
330         skbdesc->entry = entry;
331
332         memset(&rxdesc, 0, sizeof(rxdesc));
333         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
334
335         header_size = ieee80211_get_hdrlen_from_skb(entry->skb);
336
337         /*
338          * The data behind the ieee80211 header must be
339          * aligned on a 4 byte boundary. We already reserved
340          * 2 bytes for header_size % 4 == 2 optimization.
341          * To determine the number of bytes which the data
342          * should be moved to the left, we must add these
343          * 2 bytes to the header_size.
344          */
345         align = (header_size + 2) % 4;
346
347         if (align) {
348                 skb_push(entry->skb, align);
349                 /* Move entire frame in 1 command */
350                 memmove(entry->skb->data, entry->skb->data + align,
351                         rxdesc.size);
352         }
353
354         /* Update data pointers, trim buffer to correct size */
355         skbdesc->data = entry->skb->data;
356         skb_trim(entry->skb, rxdesc.size);
357
358         /*
359          * Allocate a new sk buffer to replace the current one.
360          * If allocation fails, we should drop the current frame
361          * so we can recycle the existing sk buffer for the new frame.
362          */
363         skb = rt2x00usb_alloc_rxskb(entry->queue);
364         if (!skb)
365                 goto skip_entry;
366
367         /*
368          * Send the frame to rt2x00lib for further processing.
369          */
370         rt2x00lib_rxdone(entry, &rxdesc);
371
372         /*
373          * Replace current entry's skb with the newly allocated one,
374          * and reinitialize the urb.
375          */
376         entry->skb = skb;
377         urb->transfer_buffer = entry->skb->data;
378         urb->transfer_buffer_length = entry->skb->len;
379
380 skip_entry:
381         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
382                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
383                 usb_submit_urb(urb, GFP_ATOMIC);
384         }
385
386         rt2x00queue_index_inc(entry->queue, Q_INDEX);
387 }
388
389 /*
390  * Radio handlers
391  */
392 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
393 {
394         struct queue_entry_priv_usb *entry_priv;
395         struct queue_entry_priv_usb_bcn *bcn_priv;
396         unsigned int i;
397
398         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
399                                     REGISTER_TIMEOUT);
400
401         /*
402          * Cancel all queues.
403          */
404         for (i = 0; i < rt2x00dev->rx->limit; i++) {
405                 entry_priv = rt2x00dev->rx->entries[i].priv_data;
406                 usb_kill_urb(entry_priv->urb);
407         }
408
409         /*
410          * Kill guardian urb.
411          */
412         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
413                 bcn_priv = rt2x00dev->bcn->entries[i].priv_data;
414                 if (bcn_priv->guardian_urb)
415                         usb_kill_urb(bcn_priv->guardian_urb);
416         }
417 }
418 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
419
420 /*
421  * Device initialization handlers.
422  */
423 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
424                             struct queue_entry *entry)
425 {
426         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
427         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
428
429         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
430                           usb_rcvbulkpipe(usb_dev, 1),
431                           entry->skb->data, entry->skb->len,
432                           rt2x00usb_interrupt_rxdone, entry);
433
434         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
435         usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
436 }
437 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
438
439 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
440                             struct queue_entry *entry)
441 {
442         entry->flags = 0;
443 }
444 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
445
446 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
447                                struct data_queue *queue)
448 {
449         struct queue_entry_priv_usb *entry_priv;
450         struct queue_entry_priv_usb_bcn *bcn_priv;
451         unsigned int i;
452
453         for (i = 0; i < queue->limit; i++) {
454                 entry_priv = queue->entries[i].priv_data;
455                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
456                 if (!entry_priv->urb)
457                         return -ENOMEM;
458         }
459
460         /*
461          * If this is not the beacon queue or
462          * no guardian byte was required for the beacon,
463          * then we are done.
464          */
465         if (rt2x00dev->bcn != queue ||
466             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
467                 return 0;
468
469         for (i = 0; i < queue->limit; i++) {
470                 bcn_priv = queue->entries[i].priv_data;
471                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
472                 if (!bcn_priv->guardian_urb)
473                         return -ENOMEM;
474         }
475
476         return 0;
477 }
478
479 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
480                                struct data_queue *queue)
481 {
482         struct queue_entry_priv_usb *entry_priv;
483         struct queue_entry_priv_usb_bcn *bcn_priv;
484         unsigned int i;
485
486         if (!queue->entries)
487                 return;
488
489         for (i = 0; i < queue->limit; i++) {
490                 entry_priv = queue->entries[i].priv_data;
491                 usb_kill_urb(entry_priv->urb);
492                 usb_free_urb(entry_priv->urb);
493                 if (queue->entries[i].skb)
494                         kfree_skb(queue->entries[i].skb);
495         }
496
497         /*
498          * If this is not the beacon queue or
499          * no guardian byte was required for the beacon,
500          * then we are done.
501          */
502         if (rt2x00dev->bcn != queue ||
503             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
504                 return;
505
506         for (i = 0; i < queue->limit; i++) {
507                 bcn_priv = queue->entries[i].priv_data;
508                 usb_kill_urb(bcn_priv->guardian_urb);
509                 usb_free_urb(bcn_priv->guardian_urb);
510         }
511 }
512
513 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
514 {
515         struct data_queue *queue;
516         struct sk_buff *skb;
517         unsigned int entry_size;
518         unsigned int i;
519         int uninitialized_var(status);
520
521         /*
522          * Allocate DMA
523          */
524         queue_for_each(rt2x00dev, queue) {
525                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
526                 if (status)
527                         goto exit;
528         }
529
530         /*
531          * For the RX queue, skb's should be allocated.
532          */
533         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
534         for (i = 0; i < rt2x00dev->rx->limit; i++) {
535                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
536                 if (!skb)
537                         goto exit;
538
539                 rt2x00dev->rx->entries[i].skb = skb;
540         }
541
542         return 0;
543
544 exit:
545         rt2x00usb_uninitialize(rt2x00dev);
546
547         return status;
548 }
549 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
550
551 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
552 {
553         struct data_queue *queue;
554
555         queue_for_each(rt2x00dev, queue)
556                 rt2x00usb_free_urb(rt2x00dev, queue);
557 }
558 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
559
560 /*
561  * USB driver handlers.
562  */
563 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
564 {
565         kfree(rt2x00dev->rf);
566         rt2x00dev->rf = NULL;
567
568         kfree(rt2x00dev->eeprom);
569         rt2x00dev->eeprom = NULL;
570
571         kfree(rt2x00dev->csr.cache);
572         rt2x00dev->csr.cache = NULL;
573 }
574
575 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
576 {
577         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
578         if (!rt2x00dev->csr.cache)
579                 goto exit;
580
581         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
582         if (!rt2x00dev->eeprom)
583                 goto exit;
584
585         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
586         if (!rt2x00dev->rf)
587                 goto exit;
588
589         return 0;
590
591 exit:
592         ERROR_PROBE("Failed to allocate registers.\n");
593
594         rt2x00usb_free_reg(rt2x00dev);
595
596         return -ENOMEM;
597 }
598
599 int rt2x00usb_probe(struct usb_interface *usb_intf,
600                     const struct usb_device_id *id)
601 {
602         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
603         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
604         struct ieee80211_hw *hw;
605         struct rt2x00_dev *rt2x00dev;
606         int retval;
607
608         usb_dev = usb_get_dev(usb_dev);
609
610         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
611         if (!hw) {
612                 ERROR_PROBE("Failed to allocate hardware.\n");
613                 retval = -ENOMEM;
614                 goto exit_put_device;
615         }
616
617         usb_set_intfdata(usb_intf, hw);
618
619         rt2x00dev = hw->priv;
620         rt2x00dev->dev = usb_intf;
621         rt2x00dev->ops = ops;
622         rt2x00dev->hw = hw;
623         mutex_init(&rt2x00dev->usb_cache_mutex);
624
625         rt2x00dev->usb_maxpacket =
626             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
627         if (!rt2x00dev->usb_maxpacket)
628                 rt2x00dev->usb_maxpacket = 1;
629
630         retval = rt2x00usb_alloc_reg(rt2x00dev);
631         if (retval)
632                 goto exit_free_device;
633
634         retval = rt2x00lib_probe_dev(rt2x00dev);
635         if (retval)
636                 goto exit_free_reg;
637
638         return 0;
639
640 exit_free_reg:
641         rt2x00usb_free_reg(rt2x00dev);
642
643 exit_free_device:
644         ieee80211_free_hw(hw);
645
646 exit_put_device:
647         usb_put_dev(usb_dev);
648
649         usb_set_intfdata(usb_intf, NULL);
650
651         return retval;
652 }
653 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
654
655 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
656 {
657         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
658         struct rt2x00_dev *rt2x00dev = hw->priv;
659
660         /*
661          * Free all allocated data.
662          */
663         rt2x00lib_remove_dev(rt2x00dev);
664         rt2x00usb_free_reg(rt2x00dev);
665         ieee80211_free_hw(hw);
666
667         /*
668          * Free the USB device data.
669          */
670         usb_set_intfdata(usb_intf, NULL);
671         usb_put_dev(interface_to_usbdev(usb_intf));
672 }
673 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
674
675 #ifdef CONFIG_PM
676 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
677 {
678         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
679         struct rt2x00_dev *rt2x00dev = hw->priv;
680         int retval;
681
682         retval = rt2x00lib_suspend(rt2x00dev, state);
683         if (retval)
684                 return retval;
685
686         rt2x00usb_free_reg(rt2x00dev);
687
688         /*
689          * Decrease usbdev refcount.
690          */
691         usb_put_dev(interface_to_usbdev(usb_intf));
692
693         return 0;
694 }
695 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
696
697 int rt2x00usb_resume(struct usb_interface *usb_intf)
698 {
699         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
700         struct rt2x00_dev *rt2x00dev = hw->priv;
701         int retval;
702
703         usb_get_dev(interface_to_usbdev(usb_intf));
704
705         retval = rt2x00usb_alloc_reg(rt2x00dev);
706         if (retval)
707                 return retval;
708
709         retval = rt2x00lib_resume(rt2x00dev);
710         if (retval)
711                 goto exit_free_reg;
712
713         return 0;
714
715 exit_free_reg:
716         rt2x00usb_free_reg(rt2x00dev);
717
718         return retval;
719 }
720 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
721 #endif /* CONFIG_PM */
722
723 /*
724  * rt2x00usb module information.
725  */
726 MODULE_AUTHOR(DRV_PROJECT);
727 MODULE_VERSION(DRV_VERSION);
728 MODULE_DESCRIPTION("rt2x00 usb library");
729 MODULE_LICENSE("GPL");