rt2x00: Implement WDS support
[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 = to_usb_device_intf(rt2x00dev->dev);
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->csr_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->csr_mutex);
114
115         status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
116                                                 requesttype, offset, buffer,
117                                                 buffer_length, timeout);
118
119         mutex_unlock(&rt2x00dev->csr_mutex);
120
121         return status;
122 }
123 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
124
125 int rt2x00usb_vendor_request_large_buff(struct rt2x00_dev *rt2x00dev,
126                                         const u8 request, const u8 requesttype,
127                                         const u16 offset, const void *buffer,
128                                         const u16 buffer_length,
129                                         const int timeout)
130 {
131         int status = 0;
132         unsigned char *tb;
133         u16 off, len, bsize;
134
135         mutex_lock(&rt2x00dev->csr_mutex);
136
137         tb  = (char *)buffer;
138         off = offset;
139         len = buffer_length;
140         while (len && !status) {
141                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
142                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
143                                                         requesttype, off, tb,
144                                                         bsize, timeout);
145
146                 tb  += bsize;
147                 len -= bsize;
148                 off += bsize;
149         }
150
151         mutex_unlock(&rt2x00dev->csr_mutex);
152
153         return status;
154 }
155 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_large_buff);
156
157 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
158                            const unsigned int offset,
159                            struct rt2x00_field32 field,
160                            u32 *reg)
161 {
162         unsigned int i;
163
164         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
165                 rt2x00usb_register_read_lock(rt2x00dev, offset, reg);
166                 if (!rt2x00_get_field32(*reg, field))
167                         return 1;
168                 udelay(REGISTER_BUSY_DELAY);
169         }
170
171         ERROR(rt2x00dev, "Indirect register access failed: "
172               "offset=0x%.08x, value=0x%.08x\n", offset, *reg);
173         *reg = ~0;
174
175         return 0;
176 }
177 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
178
179 /*
180  * TX data handlers.
181  */
182 static void rt2x00usb_interrupt_txdone(struct urb *urb)
183 {
184         struct queue_entry *entry = (struct queue_entry *)urb->context;
185         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
186         struct txdone_entry_desc txdesc;
187
188         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
189             !test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
190                 return;
191
192         /*
193          * Obtain the status about this packet.
194          * Note that when the status is 0 it does not mean the
195          * frame was send out correctly. It only means the frame
196          * was succesfully pushed to the hardware, we have no
197          * way to determine the transmission status right now.
198          * (Only indirectly by looking at the failed TX counters
199          * in the register).
200          */
201         txdesc.flags = 0;
202         if (!urb->status)
203                 __set_bit(TXDONE_UNKNOWN, &txdesc.flags);
204         else
205                 __set_bit(TXDONE_FAILURE, &txdesc.flags);
206         txdesc.retry = 0;
207
208         rt2x00lib_txdone(entry, &txdesc);
209 }
210
211 int rt2x00usb_write_tx_data(struct queue_entry *entry)
212 {
213         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
214         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
215         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
216         struct skb_frame_desc *skbdesc;
217         u32 length;
218
219         /*
220          * Add the descriptor in front of the skb.
221          */
222         skb_push(entry->skb, entry->queue->desc_size);
223         memset(entry->skb->data, 0, entry->queue->desc_size);
224
225         /*
226          * Fill in skb descriptor
227          */
228         skbdesc = get_skb_frame_desc(entry->skb);
229         skbdesc->desc = entry->skb->data;
230         skbdesc->desc_len = entry->queue->desc_size;
231
232         /*
233          * USB devices cannot blindly pass the skb->len as the
234          * length of the data to usb_fill_bulk_urb. Pass the skb
235          * to the driver to determine what the length should be.
236          */
237         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
238
239         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
240                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
241                           entry->skb->data, length,
242                           rt2x00usb_interrupt_txdone, entry);
243
244         /*
245          * Make sure the skb->data pointer points to the frame, not the
246          * descriptor.
247          */
248         skb_pull(entry->skb, entry->queue->desc_size);
249
250         return 0;
251 }
252 EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
253
254 static inline void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
255 {
256         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
257
258         if (test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
259                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
260 }
261
262 void rt2x00usb_kick_tx_queue(struct rt2x00_dev *rt2x00dev,
263                              const enum data_queue_qid qid)
264 {
265         struct data_queue *queue = rt2x00queue_get_queue(rt2x00dev, qid);
266         unsigned long irqflags;
267         unsigned int index;
268         unsigned int index_done;
269         unsigned int i;
270
271         /*
272          * Only protect the range we are going to loop over,
273          * if during our loop a extra entry is set to pending
274          * it should not be kicked during this run, since it
275          * is part of another TX operation.
276          */
277         spin_lock_irqsave(&queue->lock, irqflags);
278         index = queue->index[Q_INDEX];
279         index_done = queue->index[Q_INDEX_DONE];
280         spin_unlock_irqrestore(&queue->lock, irqflags);
281
282         /*
283          * Start from the TX done pointer, this guarentees that we will
284          * send out all frames in the correct order.
285          */
286         if (index_done < index) {
287                 for (i = index_done; i < index; i++)
288                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
289         } else {
290                 for (i = index_done; i < queue->limit; i++)
291                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
292
293                 for (i = 0; i < index; i++)
294                         rt2x00usb_kick_tx_entry(&queue->entries[i]);
295         }
296 }
297 EXPORT_SYMBOL_GPL(rt2x00usb_kick_tx_queue);
298
299 /*
300  * RX data handlers.
301  */
302 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
303 {
304         struct queue_entry *entry = (struct queue_entry *)urb->context;
305         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
306         struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
307         u8 rxd[32];
308
309         if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags) ||
310             !test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
311                 return;
312
313         /*
314          * Check if the received data is simply too small
315          * to be actually valid, or if the urb is signaling
316          * a problem.
317          */
318         if (urb->actual_length < entry->queue->desc_size || urb->status) {
319                 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
320                 usb_submit_urb(urb, GFP_ATOMIC);
321                 return;
322         }
323
324         /*
325          * Fill in desc fields of the skb descriptor
326          */
327         skbdesc->desc = rxd;
328         skbdesc->desc_len = entry->queue->desc_size;
329
330         /*
331          * Send the frame to rt2x00lib for further processing.
332          */
333         rt2x00lib_rxdone(rt2x00dev, entry);
334 }
335
336 /*
337  * Radio handlers
338  */
339 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
340 {
341         struct queue_entry_priv_usb *entry_priv;
342         struct queue_entry_priv_usb_bcn *bcn_priv;
343         struct data_queue *queue;
344         unsigned int i;
345
346         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
347                                     REGISTER_TIMEOUT);
348
349         /*
350          * Cancel all queues.
351          */
352         queue_for_each(rt2x00dev, queue) {
353                 for (i = 0; i < queue->limit; i++) {
354                         entry_priv = queue->entries[i].priv_data;
355                         usb_kill_urb(entry_priv->urb);
356                 }
357         }
358
359         /*
360          * Kill guardian urb (if required by driver).
361          */
362         if (!test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
363                 return;
364
365         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
366                 bcn_priv = rt2x00dev->bcn->entries[i].priv_data;
367                 if (bcn_priv->guardian_urb)
368                         usb_kill_urb(bcn_priv->guardian_urb);
369         }
370 }
371 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
372
373 /*
374  * Device initialization handlers.
375  */
376 void rt2x00usb_clear_entry(struct queue_entry *entry)
377 {
378         struct usb_device *usb_dev =
379             to_usb_device_intf(entry->queue->rt2x00dev->dev);
380         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
381         int pipe;
382
383         if (entry->queue->qid == QID_RX) {
384                 pipe = usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint);
385                 usb_fill_bulk_urb(entry_priv->urb, usb_dev, pipe,
386                                 entry->skb->data, entry->skb->len,
387                                 rt2x00usb_interrupt_rxdone, entry);
388
389                 set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
390                 usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
391         } else {
392                 entry->flags = 0;
393         }
394 }
395 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
396
397 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
398                                       struct usb_endpoint_descriptor *ep_desc)
399 {
400         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
401         int pipe;
402
403         queue->usb_endpoint = usb_endpoint_num(ep_desc);
404
405         if (queue->qid == QID_RX) {
406                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
407                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
408         } else {
409                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
410                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
411         }
412
413         if (!queue->usb_maxpacket)
414                 queue->usb_maxpacket = 1;
415 }
416
417 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
418 {
419         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
420         struct usb_host_interface *intf_desc = intf->cur_altsetting;
421         struct usb_endpoint_descriptor *ep_desc;
422         struct data_queue *queue = rt2x00dev->tx;
423         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
424         unsigned int i;
425
426         /*
427          * Walk through all available endpoints to search for "bulk in"
428          * and "bulk out" endpoints. When we find such endpoints collect
429          * the information we need from the descriptor and assign it
430          * to the queue.
431          */
432         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
433                 ep_desc = &intf_desc->endpoint[i].desc;
434
435                 if (usb_endpoint_is_bulk_in(ep_desc)) {
436                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
437                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
438                            (queue != queue_end(rt2x00dev))) {
439                         rt2x00usb_assign_endpoint(queue, ep_desc);
440                         queue = queue_next(queue);
441
442                         tx_ep_desc = ep_desc;
443                 }
444         }
445
446         /*
447          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
448          */
449         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
450                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
451                 return -EPIPE;
452         }
453
454         /*
455          * It might be possible not all queues have a dedicated endpoint.
456          * Loop through all TX queues and copy the endpoint information
457          * which we have gathered from already assigned endpoints.
458          */
459         txall_queue_for_each(rt2x00dev, queue) {
460                 if (!queue->usb_endpoint)
461                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
462         }
463
464         return 0;
465 }
466
467 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
468                                struct data_queue *queue)
469 {
470         struct queue_entry_priv_usb *entry_priv;
471         struct queue_entry_priv_usb_bcn *bcn_priv;
472         unsigned int i;
473
474         for (i = 0; i < queue->limit; i++) {
475                 entry_priv = queue->entries[i].priv_data;
476                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
477                 if (!entry_priv->urb)
478                         return -ENOMEM;
479         }
480
481         /*
482          * If this is not the beacon queue or
483          * no guardian byte was required for the beacon,
484          * then we are done.
485          */
486         if (rt2x00dev->bcn != queue ||
487             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
488                 return 0;
489
490         for (i = 0; i < queue->limit; i++) {
491                 bcn_priv = queue->entries[i].priv_data;
492                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
493                 if (!bcn_priv->guardian_urb)
494                         return -ENOMEM;
495         }
496
497         return 0;
498 }
499
500 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
501                                struct data_queue *queue)
502 {
503         struct queue_entry_priv_usb *entry_priv;
504         struct queue_entry_priv_usb_bcn *bcn_priv;
505         unsigned int i;
506
507         if (!queue->entries)
508                 return;
509
510         for (i = 0; i < queue->limit; i++) {
511                 entry_priv = queue->entries[i].priv_data;
512                 usb_kill_urb(entry_priv->urb);
513                 usb_free_urb(entry_priv->urb);
514         }
515
516         /*
517          * If this is not the beacon queue or
518          * no guardian byte was required for the beacon,
519          * then we are done.
520          */
521         if (rt2x00dev->bcn != queue ||
522             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
523                 return;
524
525         for (i = 0; i < queue->limit; i++) {
526                 bcn_priv = queue->entries[i].priv_data;
527                 usb_kill_urb(bcn_priv->guardian_urb);
528                 usb_free_urb(bcn_priv->guardian_urb);
529         }
530 }
531
532 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
533 {
534         struct data_queue *queue;
535         int status;
536
537         /*
538          * Find endpoints for each queue
539          */
540         status = rt2x00usb_find_endpoints(rt2x00dev);
541         if (status)
542                 goto exit;
543
544         /*
545          * Allocate DMA
546          */
547         queue_for_each(rt2x00dev, queue) {
548                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
549                 if (status)
550                         goto exit;
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->dev;
632         rt2x00dev->ops = ops;
633         rt2x00dev->hw = hw;
634
635         retval = rt2x00usb_alloc_reg(rt2x00dev);
636         if (retval)
637                 goto exit_free_device;
638
639         retval = rt2x00lib_probe_dev(rt2x00dev);
640         if (retval)
641                 goto exit_free_reg;
642
643         return 0;
644
645 exit_free_reg:
646         rt2x00usb_free_reg(rt2x00dev);
647
648 exit_free_device:
649         ieee80211_free_hw(hw);
650
651 exit_put_device:
652         usb_put_dev(usb_dev);
653
654         usb_set_intfdata(usb_intf, NULL);
655
656         return retval;
657 }
658 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
659
660 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
661 {
662         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
663         struct rt2x00_dev *rt2x00dev = hw->priv;
664
665         /*
666          * Free all allocated data.
667          */
668         rt2x00lib_remove_dev(rt2x00dev);
669         rt2x00usb_free_reg(rt2x00dev);
670         ieee80211_free_hw(hw);
671
672         /*
673          * Free the USB device data.
674          */
675         usb_set_intfdata(usb_intf, NULL);
676         usb_put_dev(interface_to_usbdev(usb_intf));
677 }
678 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
679
680 #ifdef CONFIG_PM
681 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
682 {
683         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
684         struct rt2x00_dev *rt2x00dev = hw->priv;
685         int retval;
686
687         retval = rt2x00lib_suspend(rt2x00dev, state);
688         if (retval)
689                 return retval;
690
691         rt2x00usb_free_reg(rt2x00dev);
692
693         /*
694          * Decrease usbdev refcount.
695          */
696         usb_put_dev(interface_to_usbdev(usb_intf));
697
698         return 0;
699 }
700 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
701
702 int rt2x00usb_resume(struct usb_interface *usb_intf)
703 {
704         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
705         struct rt2x00_dev *rt2x00dev = hw->priv;
706         int retval;
707
708         usb_get_dev(interface_to_usbdev(usb_intf));
709
710         retval = rt2x00usb_alloc_reg(rt2x00dev);
711         if (retval)
712                 return retval;
713
714         retval = rt2x00lib_resume(rt2x00dev);
715         if (retval)
716                 goto exit_free_reg;
717
718         return 0;
719
720 exit_free_reg:
721         rt2x00usb_free_reg(rt2x00dev);
722
723         return retval;
724 }
725 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
726 #endif /* CONFIG_PM */
727
728 /*
729  * rt2x00usb module information.
730  */
731 MODULE_AUTHOR(DRV_PROJECT);
732 MODULE_VERSION(DRV_VERSION);
733 MODULE_DESCRIPTION("rt2x00 usb library");
734 MODULE_LICENSE("GPL");