rt2x00: Kill guardian urb during disable_radio
[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 static void rt2x00usb_vendor_request_async_complete(struct urb *urb)
126 {
127         /*
128          * We're done with it, descrease usage count and let the
129          * usb layer delete it as soon as it is done with it.
130          */
131         usb_put_urb(urb);
132 }
133
134 int rt2x00usb_vendor_request_async(struct rt2x00_dev *rt2x00dev,
135                                    const u8 request, const u16 offset,
136                                    const u16 value)
137 {
138         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
139         struct usb_ctrlrequest *ctrl;
140         struct urb *urb;
141         int status;
142
143         urb = usb_alloc_urb(0, GFP_NOIO);
144         if (!urb)
145                 return -ENOMEM;
146
147         ctrl = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
148         if (!ctrl) {
149                 status = -ENOMEM;
150                 goto exit;
151         }
152
153         ctrl->bRequestType= USB_VENDOR_REQUEST_OUT;
154         ctrl->bRequest = request;
155         ctrl->wValue = cpu_to_le16p(&value);
156         ctrl->wIndex = cpu_to_le16p(&offset);
157         ctrl->wLength = 0;
158
159         usb_fill_control_urb(urb, usb_dev, usb_sndctrlpipe(usb_dev, 0),
160                              (unsigned char *)ctrl, NULL, 0,
161                              rt2x00usb_vendor_request_async_complete, NULL);
162
163         status = usb_submit_urb(urb, GFP_ATOMIC);
164         if (!status)
165                 goto exit;
166
167         return 0;
168
169 exit:
170         usb_put_urb(urb);
171         kfree(ctrl);
172
173         return status;
174 }
175 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_async);
176
177 /*
178  * TX data handlers.
179  */
180 static void rt2x00usb_interrupt_txdone(struct urb *urb)
181 {
182         struct queue_entry *entry = (struct queue_entry *)urb->context;
183         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
184         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
185         struct txdone_entry_desc txdesc;
186         __le32 *txd = (__le32 *)entry->skb->data;
187         u32 word;
188
189         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
190             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
191                 return;
192
193         rt2x00_desc_read(txd, 0, &word);
194
195         /*
196          * Remove the descriptor data from the buffer.
197          */
198         skb_pull(entry->skb, entry->queue->desc_size);
199
200         /*
201          * Obtain the status about this packet.
202          */
203         txdesc.status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
204         txdesc.retry = 0;
205         txdesc.control = &priv_tx->control;
206
207         rt2x00lib_txdone(entry, &txdesc);
208
209         /*
210          * Make this entry available for reuse.
211          */
212         entry->flags = 0;
213         rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);
214
215         /*
216          * If the data queue was full before the txdone handler
217          * we must make sure the packet queue in the mac80211 stack
218          * is reenabled when the txdone handler has finished.
219          */
220         if (!rt2x00queue_full(entry->queue))
221                 ieee80211_wake_queue(rt2x00dev->hw, priv_tx->control.queue);
222 }
223
224 int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
225                             struct data_queue *queue, struct sk_buff *skb,
226                             struct ieee80211_tx_control *control)
227 {
228         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
229         struct queue_entry *entry = rt2x00queue_get_entry(queue, Q_INDEX);
230         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
231         struct skb_frame_desc *skbdesc;
232         u32 length;
233
234         if (rt2x00queue_full(queue))
235                 return -EINVAL;
236
237         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags)) {
238                 ERROR(rt2x00dev,
239                       "Arrived at non-free entry in the non-full queue %d.\n"
240                       "Please file bug report to %s.\n",
241                       control->queue, DRV_PROJECT);
242                 return -EINVAL;
243         }
244
245         /*
246          * Add the descriptor in front of the skb.
247          */
248         skb_push(skb, queue->desc_size);
249         memset(skb->data, 0, queue->desc_size);
250
251         /*
252          * Fill in skb descriptor
253          */
254         skbdesc = get_skb_frame_desc(skb);
255         memset(skbdesc, 0, sizeof(*skbdesc));
256         skbdesc->data = skb->data + queue->desc_size;
257         skbdesc->data_len = skb->len - queue->desc_size;
258         skbdesc->desc = skb->data;
259         skbdesc->desc_len = queue->desc_size;
260         skbdesc->entry = entry;
261
262         rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
263
264         /*
265          * USB devices cannot blindly pass the skb->len as the
266          * length of the data to usb_fill_bulk_urb. Pass the skb
267          * to the driver to determine what the length should be.
268          */
269         length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
270
271         /*
272          * Initialize URB and send the frame to the device.
273          */
274         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
275         usb_fill_bulk_urb(priv_tx->urb, usb_dev, usb_sndbulkpipe(usb_dev, 1),
276                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
277         usb_submit_urb(priv_tx->urb, GFP_ATOMIC);
278
279         rt2x00queue_index_inc(queue, Q_INDEX);
280
281         return 0;
282 }
283 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
284
285 /*
286  * RX data handlers.
287  */
288 static struct sk_buff* rt2x00usb_alloc_rxskb(struct data_queue *queue)
289 {
290         struct sk_buff *skb;
291         unsigned int frame_size;
292
293         /*
294          * As alignment we use 2 and not NET_IP_ALIGN because we need
295          * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
296          * can be 0 on some hardware). We use these 2 bytes for frame
297          * alignment later, we assume that the chance that
298          * header_size % 4 == 2 is bigger then header_size % 2 == 0
299          * and thus optimize alignment by reserving the 2 bytes in
300          * advance.
301          */
302         frame_size = queue->data_size + queue->desc_size;
303         skb = dev_alloc_skb(frame_size + 2);
304         if (!skb)
305                 return NULL;
306
307         skb_reserve(skb, 2);
308         skb_put(skb, frame_size);
309
310         return skb;
311 }
312
313 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
314 {
315         struct queue_entry *entry = (struct queue_entry *)urb->context;
316         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
317         struct sk_buff *skb;
318         struct skb_frame_desc *skbdesc;
319         struct rxdone_entry_desc rxdesc;
320
321         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
322             !test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
323                 return;
324
325         /*
326          * Check if the received data is simply too small
327          * to be actually valid, or if the urb is signaling
328          * a problem.
329          */
330         if (urb->actual_length < entry->queue->desc_size || urb->status)
331                 goto skip_entry;
332
333         /*
334          * Fill in skb descriptor
335          */
336         skbdesc = get_skb_frame_desc(entry->skb);
337         memset(skbdesc, 0, sizeof(*skbdesc));
338         skbdesc->entry = entry;
339
340         memset(&rxdesc, 0, sizeof(rxdesc));
341         rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);
342
343         /*
344          * Allocate a new sk buffer to replace the current one.
345          * If allocation fails, we should drop the current frame
346          * so we can recycle the existing sk buffer for the new frame.
347          */
348         skb = rt2x00usb_alloc_rxskb(entry->queue);
349         if (!skb)
350                 goto skip_entry;
351
352         /*
353          * Send the frame to rt2x00lib for further processing.
354          */
355         rt2x00lib_rxdone(entry, &rxdesc);
356
357         /*
358          * Replace current entry's skb with the newly allocated one,
359          * and reinitialize the urb.
360          */
361         entry->skb = skb;
362         urb->transfer_buffer = entry->skb->data;
363         urb->transfer_buffer_length = entry->skb->len;
364
365 skip_entry:
366         if (test_bit(DEVICE_ENABLED_RADIO, &entry->queue->rt2x00dev->flags)) {
367                 __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
368                 usb_submit_urb(urb, GFP_ATOMIC);
369         }
370
371         rt2x00queue_index_inc(entry->queue, Q_INDEX);
372 }
373
374 /*
375  * Radio handlers
376  */
377 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
378 {
379         struct queue_entry_priv_usb_rx *priv_rx;
380         struct queue_entry_priv_usb_tx *priv_tx;
381         struct queue_entry_priv_usb_bcn *priv_bcn;
382         struct data_queue *queue;
383         unsigned int i;
384
385         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
386                                     REGISTER_TIMEOUT);
387
388         /*
389          * Cancel all queues.
390          */
391         for (i = 0; i < rt2x00dev->rx->limit; i++) {
392                 priv_rx = rt2x00dev->rx->entries[i].priv_data;
393                 usb_kill_urb(priv_rx->urb);
394         }
395
396         tx_queue_for_each(rt2x00dev, queue) {
397                 for (i = 0; i < queue->limit; i++) {
398                         priv_tx = queue->entries[i].priv_data;
399                         usb_kill_urb(priv_tx->urb);
400                 }
401         }
402
403         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
404                 priv_bcn = rt2x00dev->bcn->entries[i].priv_data;
405                 usb_kill_urb(priv_bcn->urb);
406
407                 if (priv_bcn->guardian_urb)
408                         usb_kill_urb(priv_bcn->guardian_urb);
409         }
410
411         if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
412                 return;
413
414         for (i = 0; i < rt2x00dev->bcn[1].limit; i++) {
415                 priv_tx = rt2x00dev->bcn[1].entries[i].priv_data;
416                 usb_kill_urb(priv_tx->urb);
417         }
418 }
419 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
420
421 /*
422  * Device initialization handlers.
423  */
424 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
425                             struct queue_entry *entry)
426 {
427         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
428         struct queue_entry_priv_usb_rx *priv_rx = entry->priv_data;
429
430         usb_fill_bulk_urb(priv_rx->urb, usb_dev,
431                           usb_rcvbulkpipe(usb_dev, 1),
432                           entry->skb->data, entry->skb->len,
433                           rt2x00usb_interrupt_rxdone, entry);
434
435         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
436         usb_submit_urb(priv_rx->urb, GFP_ATOMIC);
437 }
438 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
439
440 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
441                             struct queue_entry *entry)
442 {
443         entry->flags = 0;
444 }
445 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
446
447 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
448                                struct data_queue *queue)
449 {
450         struct queue_entry_priv_usb_rx *priv_rx;
451         struct queue_entry_priv_usb_tx *priv_tx;
452         struct queue_entry_priv_usb_bcn *priv_bcn;
453         struct urb *urb;
454         unsigned int guardian =
455             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
456         unsigned int i;
457
458         /*
459          * Allocate the URB's
460          */
461         for (i = 0; i < queue->limit; i++) {
462                 urb = usb_alloc_urb(0, GFP_KERNEL);
463                 if (!urb)
464                         return -ENOMEM;
465
466                 if (queue->qid == QID_RX) {
467                         priv_rx = queue->entries[i].priv_data;
468                         priv_rx->urb = urb;
469                 } else if (queue->qid == QID_MGMT && guardian) {
470                         priv_bcn = queue->entries[i].priv_data;
471                         priv_bcn->urb = urb;
472
473                         urb = usb_alloc_urb(0, GFP_KERNEL);
474                         if (!urb)
475                                 return -ENOMEM;
476
477                         priv_bcn->guardian_urb = urb;
478                 } else {
479                         priv_tx = queue->entries[i].priv_data;
480                         priv_tx->urb = urb;
481                 }
482         }
483
484         return 0;
485 }
486
487 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
488                                struct data_queue *queue)
489 {
490         struct queue_entry_priv_usb_rx *priv_rx;
491         struct queue_entry_priv_usb_tx *priv_tx;
492         struct queue_entry_priv_usb_bcn *priv_bcn;
493         struct urb *urb;
494         unsigned int guardian =
495             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
496         unsigned int i;
497
498         if (!queue->entries)
499                 return;
500
501         for (i = 0; i < queue->limit; i++) {
502                 if (queue->qid == QID_RX) {
503                         priv_rx = queue->entries[i].priv_data;
504                         urb = priv_rx->urb;
505                 } else if (queue->qid == QID_MGMT && guardian) {
506                         priv_bcn = queue->entries[i].priv_data;
507
508                         usb_kill_urb(priv_bcn->guardian_urb);
509                         usb_free_urb(priv_bcn->guardian_urb);
510
511                         urb = priv_bcn->urb;
512                 } else {
513                         priv_tx = queue->entries[i].priv_data;
514                         urb = priv_tx->urb;
515                 }
516
517                 usb_kill_urb(urb);
518                 usb_free_urb(urb);
519                 if (queue->entries[i].skb)
520                         kfree_skb(queue->entries[i].skb);
521         }
522 }
523
524 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
525 {
526         struct data_queue *queue;
527         struct sk_buff *skb;
528         unsigned int entry_size;
529         unsigned int i;
530         int uninitialized_var(status);
531
532         /*
533          * Allocate DMA
534          */
535         queue_for_each(rt2x00dev, queue) {
536                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
537                 if (status)
538                         goto exit;
539         }
540
541         /*
542          * For the RX queue, skb's should be allocated.
543          */
544         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
545         for (i = 0; i < rt2x00dev->rx->limit; i++) {
546                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
547                 if (!skb)
548                         goto exit;
549
550                 rt2x00dev->rx->entries[i].skb = skb;
551         }
552
553         return 0;
554
555 exit:
556         rt2x00usb_uninitialize(rt2x00dev);
557
558         return status;
559 }
560 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
561
562 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
563 {
564         struct data_queue *queue;
565
566         queue_for_each(rt2x00dev, queue)
567                 rt2x00usb_free_urb(rt2x00dev, queue);
568 }
569 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
570
571 /*
572  * USB driver handlers.
573  */
574 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
575 {
576         kfree(rt2x00dev->rf);
577         rt2x00dev->rf = NULL;
578
579         kfree(rt2x00dev->eeprom);
580         rt2x00dev->eeprom = NULL;
581
582         kfree(rt2x00dev->csr.cache);
583         rt2x00dev->csr.cache = NULL;
584 }
585
586 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
587 {
588         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
589         if (!rt2x00dev->csr.cache)
590                 goto exit;
591
592         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
593         if (!rt2x00dev->eeprom)
594                 goto exit;
595
596         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
597         if (!rt2x00dev->rf)
598                 goto exit;
599
600         return 0;
601
602 exit:
603         ERROR_PROBE("Failed to allocate registers.\n");
604
605         rt2x00usb_free_reg(rt2x00dev);
606
607         return -ENOMEM;
608 }
609
610 int rt2x00usb_probe(struct usb_interface *usb_intf,
611                     const struct usb_device_id *id)
612 {
613         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
614         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
615         struct ieee80211_hw *hw;
616         struct rt2x00_dev *rt2x00dev;
617         int retval;
618
619         usb_dev = usb_get_dev(usb_dev);
620
621         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
622         if (!hw) {
623                 ERROR_PROBE("Failed to allocate hardware.\n");
624                 retval = -ENOMEM;
625                 goto exit_put_device;
626         }
627
628         usb_set_intfdata(usb_intf, hw);
629
630         rt2x00dev = hw->priv;
631         rt2x00dev->dev = usb_intf;
632         rt2x00dev->ops = ops;
633         rt2x00dev->hw = hw;
634         mutex_init(&rt2x00dev->usb_cache_mutex);
635
636         rt2x00dev->usb_maxpacket =
637             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
638         if (!rt2x00dev->usb_maxpacket)
639                 rt2x00dev->usb_maxpacket = 1;
640
641         retval = rt2x00usb_alloc_reg(rt2x00dev);
642         if (retval)
643                 goto exit_free_device;
644
645         retval = rt2x00lib_probe_dev(rt2x00dev);
646         if (retval)
647                 goto exit_free_reg;
648
649         return 0;
650
651 exit_free_reg:
652         rt2x00usb_free_reg(rt2x00dev);
653
654 exit_free_device:
655         ieee80211_free_hw(hw);
656
657 exit_put_device:
658         usb_put_dev(usb_dev);
659
660         usb_set_intfdata(usb_intf, NULL);
661
662         return retval;
663 }
664 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
665
666 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
667 {
668         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
669         struct rt2x00_dev *rt2x00dev = hw->priv;
670
671         /*
672          * Free all allocated data.
673          */
674         rt2x00lib_remove_dev(rt2x00dev);
675         rt2x00usb_free_reg(rt2x00dev);
676         ieee80211_free_hw(hw);
677
678         /*
679          * Free the USB device data.
680          */
681         usb_set_intfdata(usb_intf, NULL);
682         usb_put_dev(interface_to_usbdev(usb_intf));
683 }
684 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
685
686 #ifdef CONFIG_PM
687 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
688 {
689         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
690         struct rt2x00_dev *rt2x00dev = hw->priv;
691         int retval;
692
693         retval = rt2x00lib_suspend(rt2x00dev, state);
694         if (retval)
695                 return retval;
696
697         rt2x00usb_free_reg(rt2x00dev);
698
699         /*
700          * Decrease usbdev refcount.
701          */
702         usb_put_dev(interface_to_usbdev(usb_intf));
703
704         return 0;
705 }
706 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
707
708 int rt2x00usb_resume(struct usb_interface *usb_intf)
709 {
710         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
711         struct rt2x00_dev *rt2x00dev = hw->priv;
712         int retval;
713
714         usb_get_dev(interface_to_usbdev(usb_intf));
715
716         retval = rt2x00usb_alloc_reg(rt2x00dev);
717         if (retval)
718                 return retval;
719
720         retval = rt2x00lib_resume(rt2x00dev);
721         if (retval)
722                 goto exit_free_reg;
723
724         return 0;
725
726 exit_free_reg:
727         rt2x00usb_free_reg(rt2x00dev);
728
729         return retval;
730 }
731 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
732 #endif /* CONFIG_PM */
733
734 /*
735  * rt2x00usb module information.
736  */
737 MODULE_AUTHOR(DRV_PROJECT);
738 MODULE_VERSION(DRV_VERSION);
739 MODULE_DESCRIPTION("rt2x00 usb library");
740 MODULE_LICENSE("GPL");