rt2x00: Split rt2x00lib_write_tx_desc()
[linux-2.6] / drivers / net / wireless / rt2x00 / rt2x00usb.c
1 /*
2         Copyright (C) 2004 - 2008 rt2x00 SourceForge Project
3         <http://rt2x00.serialmonkey.com>
4
5         This program is free software; you can redistribute it and/or modify
6         it under the terms of the GNU General Public License as published by
7         the Free Software Foundation; either version 2 of the License, or
8         (at your option) any later version.
9
10         This program is distributed in the hope that it will be useful,
11         but WITHOUT ANY WARRANTY; without even the implied warranty of
12         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13         GNU General Public License for more details.
14
15         You should have received a copy of the GNU General Public License
16         along with this program; if not, write to the
17         Free Software Foundation, Inc.,
18         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 /*
22         Module: rt2x00usb
23         Abstract: rt2x00 generic usb device routines.
24  */
25
26 #include <linux/kernel.h>
27 #include <linux/module.h>
28 #include <linux/usb.h>
29 #include <linux/bug.h>
30
31 #include "rt2x00.h"
32 #include "rt2x00usb.h"
33
34 /*
35  * Interfacing with the HW.
36  */
37 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
38                              const u8 request, const u8 requesttype,
39                              const u16 offset, const u16 value,
40                              void *buffer, const u16 buffer_length,
41                              const int timeout)
42 {
43         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
44         int status;
45         unsigned int i;
46         unsigned int pipe =
47             (requesttype == USB_VENDOR_REQUEST_IN) ?
48             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
49
50
51         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
52                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
53                                          value, offset, buffer, buffer_length,
54                                          timeout);
55                 if (status >= 0)
56                         return 0;
57
58                 /*
59                  * Check for errors
60                  * -ENODEV: Device has disappeared, no point continuing.
61                  * All other errors: Try again.
62                  */
63                 else if (status == -ENODEV)
64                         break;
65         }
66
67         ERROR(rt2x00dev,
68               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
69               request, offset, status);
70
71         return status;
72 }
73 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
74
75 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
76                                    const u8 request, const u8 requesttype,
77                                    const u16 offset, void *buffer,
78                                    const u16 buffer_length, const int timeout)
79 {
80         int status;
81
82         BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
83
84         /*
85          * Check for Cache availability.
86          */
87         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
88                 ERROR(rt2x00dev, "CSR cache not available.\n");
89                 return -ENOMEM;
90         }
91
92         if (requesttype == USB_VENDOR_REQUEST_OUT)
93                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
94
95         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
96                                           offset, 0, rt2x00dev->csr.cache,
97                                           buffer_length, timeout);
98
99         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
100                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
101
102         return status;
103 }
104 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
105
106 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
107                                   const u8 request, const u8 requesttype,
108                                   const u16 offset, void *buffer,
109                                   const u16 buffer_length, const int timeout)
110 {
111         int status;
112
113         mutex_lock(&rt2x00dev->usb_cache_mutex);
114
115         status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
116                                                 requesttype, offset, buffer,
117                                                 buffer_length, timeout);
118
119         mutex_unlock(&rt2x00dev->usb_cache_mutex);
120
121         return status;
122 }
123 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
124
125 /*
126  * TX data handlers.
127  */
128 static void rt2x00usb_interrupt_txdone(struct urb *urb)
129 {
130         struct queue_entry *entry = (struct queue_entry *)urb->context;
131         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
132         struct queue_entry_priv_usb_tx *priv_tx = entry->priv_data;
133         struct txdone_entry_desc txdesc;
134         __le32 *txd = (__le32 *)entry->skb->data;
135         u32 word;
136
137         if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
138             !__test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
139                 return;
140
141         rt2x00_desc_read(txd, 0, &word);
142
143         /*
144          * Remove the descriptor data from the buffer.
145          */
146         skb_pull(entry->skb, entry->queue->desc_size);
147
148         /*
149          * Obtain the status about this packet.
150          * 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 = &priv_tx->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, priv_tx->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_tx *priv_tx = 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(&priv_tx->control, control, sizeof(priv_tx->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(priv_tx->urb, usb_dev, usb_sndbulkpipe(usb_dev, 1),
242                           skb->data, length, rt2x00usb_interrupt_txdone, entry);
243         usb_submit_urb(priv_tx->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_rx *priv_rx;
384         struct queue_entry_priv_usb_tx *priv_tx;
385         struct queue_entry_priv_usb_bcn *priv_bcn;
386         struct data_queue *queue;
387         unsigned int i;
388
389         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
390                                     REGISTER_TIMEOUT);
391
392         /*
393          * Cancel all queues.
394          */
395         for (i = 0; i < rt2x00dev->rx->limit; i++) {
396                 priv_rx = rt2x00dev->rx->entries[i].priv_data;
397                 usb_kill_urb(priv_rx->urb);
398         }
399
400         tx_queue_for_each(rt2x00dev, queue) {
401                 for (i = 0; i < queue->limit; i++) {
402                         priv_tx = queue->entries[i].priv_data;
403                         usb_kill_urb(priv_tx->urb);
404                 }
405         }
406
407         for (i = 0; i < rt2x00dev->bcn->limit; i++) {
408                 priv_bcn = rt2x00dev->bcn->entries[i].priv_data;
409                 usb_kill_urb(priv_bcn->urb);
410
411                 if (priv_bcn->guardian_urb)
412                         usb_kill_urb(priv_bcn->guardian_urb);
413         }
414
415         if (!test_bit(DRIVER_REQUIRE_ATIM_QUEUE, &rt2x00dev->flags))
416                 return;
417
418         for (i = 0; i < rt2x00dev->bcn[1].limit; i++) {
419                 priv_tx = rt2x00dev->bcn[1].entries[i].priv_data;
420                 usb_kill_urb(priv_tx->urb);
421         }
422 }
423 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
424
425 /*
426  * Device initialization handlers.
427  */
428 void rt2x00usb_init_rxentry(struct rt2x00_dev *rt2x00dev,
429                             struct queue_entry *entry)
430 {
431         struct usb_device *usb_dev = rt2x00dev_usb_dev(rt2x00dev);
432         struct queue_entry_priv_usb_rx *priv_rx = entry->priv_data;
433
434         usb_fill_bulk_urb(priv_rx->urb, usb_dev,
435                           usb_rcvbulkpipe(usb_dev, 1),
436                           entry->skb->data, entry->skb->len,
437                           rt2x00usb_interrupt_rxdone, entry);
438
439         __set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
440         usb_submit_urb(priv_rx->urb, GFP_ATOMIC);
441 }
442 EXPORT_SYMBOL_GPL(rt2x00usb_init_rxentry);
443
444 void rt2x00usb_init_txentry(struct rt2x00_dev *rt2x00dev,
445                             struct queue_entry *entry)
446 {
447         entry->flags = 0;
448 }
449 EXPORT_SYMBOL_GPL(rt2x00usb_init_txentry);
450
451 static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
452                                struct data_queue *queue)
453 {
454         struct queue_entry_priv_usb_rx *priv_rx;
455         struct queue_entry_priv_usb_tx *priv_tx;
456         struct queue_entry_priv_usb_bcn *priv_bcn;
457         struct urb *urb;
458         unsigned int guardian =
459             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
460         unsigned int i;
461
462         /*
463          * Allocate the URB's
464          */
465         for (i = 0; i < queue->limit; i++) {
466                 urb = usb_alloc_urb(0, GFP_KERNEL);
467                 if (!urb)
468                         return -ENOMEM;
469
470                 if (queue->qid == QID_RX) {
471                         priv_rx = queue->entries[i].priv_data;
472                         priv_rx->urb = urb;
473                 } else if (queue->qid == QID_MGMT && guardian) {
474                         priv_bcn = queue->entries[i].priv_data;
475                         priv_bcn->urb = urb;
476
477                         urb = usb_alloc_urb(0, GFP_KERNEL);
478                         if (!urb)
479                                 return -ENOMEM;
480
481                         priv_bcn->guardian_urb = urb;
482                 } else {
483                         priv_tx = queue->entries[i].priv_data;
484                         priv_tx->urb = urb;
485                 }
486         }
487
488         return 0;
489 }
490
491 static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
492                                struct data_queue *queue)
493 {
494         struct queue_entry_priv_usb_rx *priv_rx;
495         struct queue_entry_priv_usb_tx *priv_tx;
496         struct queue_entry_priv_usb_bcn *priv_bcn;
497         struct urb *urb;
498         unsigned int guardian =
499             test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags);
500         unsigned int i;
501
502         if (!queue->entries)
503                 return;
504
505         for (i = 0; i < queue->limit; i++) {
506                 if (queue->qid == QID_RX) {
507                         priv_rx = queue->entries[i].priv_data;
508                         urb = priv_rx->urb;
509                 } else if (queue->qid == QID_MGMT && guardian) {
510                         priv_bcn = queue->entries[i].priv_data;
511
512                         usb_kill_urb(priv_bcn->guardian_urb);
513                         usb_free_urb(priv_bcn->guardian_urb);
514
515                         urb = priv_bcn->urb;
516                 } else {
517                         priv_tx = queue->entries[i].priv_data;
518                         urb = priv_tx->urb;
519                 }
520
521                 usb_kill_urb(urb);
522                 usb_free_urb(urb);
523                 if (queue->entries[i].skb)
524                         kfree_skb(queue->entries[i].skb);
525         }
526 }
527
528 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
529 {
530         struct data_queue *queue;
531         struct sk_buff *skb;
532         unsigned int entry_size;
533         unsigned int i;
534         int uninitialized_var(status);
535
536         /*
537          * Allocate DMA
538          */
539         queue_for_each(rt2x00dev, queue) {
540                 status = rt2x00usb_alloc_urb(rt2x00dev, queue);
541                 if (status)
542                         goto exit;
543         }
544
545         /*
546          * For the RX queue, skb's should be allocated.
547          */
548         entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
549         for (i = 0; i < rt2x00dev->rx->limit; i++) {
550                 skb = rt2x00usb_alloc_rxskb(rt2x00dev->rx);
551                 if (!skb)
552                         goto exit;
553
554                 rt2x00dev->rx->entries[i].skb = skb;
555         }
556
557         return 0;
558
559 exit:
560         rt2x00usb_uninitialize(rt2x00dev);
561
562         return status;
563 }
564 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
565
566 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
567 {
568         struct data_queue *queue;
569
570         queue_for_each(rt2x00dev, queue)
571                 rt2x00usb_free_urb(rt2x00dev, queue);
572 }
573 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
574
575 /*
576  * USB driver handlers.
577  */
578 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
579 {
580         kfree(rt2x00dev->rf);
581         rt2x00dev->rf = NULL;
582
583         kfree(rt2x00dev->eeprom);
584         rt2x00dev->eeprom = NULL;
585
586         kfree(rt2x00dev->csr.cache);
587         rt2x00dev->csr.cache = NULL;
588 }
589
590 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
591 {
592         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
593         if (!rt2x00dev->csr.cache)
594                 goto exit;
595
596         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
597         if (!rt2x00dev->eeprom)
598                 goto exit;
599
600         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
601         if (!rt2x00dev->rf)
602                 goto exit;
603
604         return 0;
605
606 exit:
607         ERROR_PROBE("Failed to allocate registers.\n");
608
609         rt2x00usb_free_reg(rt2x00dev);
610
611         return -ENOMEM;
612 }
613
614 int rt2x00usb_probe(struct usb_interface *usb_intf,
615                     const struct usb_device_id *id)
616 {
617         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
618         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
619         struct ieee80211_hw *hw;
620         struct rt2x00_dev *rt2x00dev;
621         int retval;
622
623         usb_dev = usb_get_dev(usb_dev);
624
625         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
626         if (!hw) {
627                 ERROR_PROBE("Failed to allocate hardware.\n");
628                 retval = -ENOMEM;
629                 goto exit_put_device;
630         }
631
632         usb_set_intfdata(usb_intf, hw);
633
634         rt2x00dev = hw->priv;
635         rt2x00dev->dev = usb_intf;
636         rt2x00dev->ops = ops;
637         rt2x00dev->hw = hw;
638         mutex_init(&rt2x00dev->usb_cache_mutex);
639
640         rt2x00dev->usb_maxpacket =
641             usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
642         if (!rt2x00dev->usb_maxpacket)
643                 rt2x00dev->usb_maxpacket = 1;
644
645         retval = rt2x00usb_alloc_reg(rt2x00dev);
646         if (retval)
647                 goto exit_free_device;
648
649         retval = rt2x00lib_probe_dev(rt2x00dev);
650         if (retval)
651                 goto exit_free_reg;
652
653         return 0;
654
655 exit_free_reg:
656         rt2x00usb_free_reg(rt2x00dev);
657
658 exit_free_device:
659         ieee80211_free_hw(hw);
660
661 exit_put_device:
662         usb_put_dev(usb_dev);
663
664         usb_set_intfdata(usb_intf, NULL);
665
666         return retval;
667 }
668 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
669
670 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
671 {
672         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
673         struct rt2x00_dev *rt2x00dev = hw->priv;
674
675         /*
676          * Free all allocated data.
677          */
678         rt2x00lib_remove_dev(rt2x00dev);
679         rt2x00usb_free_reg(rt2x00dev);
680         ieee80211_free_hw(hw);
681
682         /*
683          * Free the USB device data.
684          */
685         usb_set_intfdata(usb_intf, NULL);
686         usb_put_dev(interface_to_usbdev(usb_intf));
687 }
688 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
689
690 #ifdef CONFIG_PM
691 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
692 {
693         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
694         struct rt2x00_dev *rt2x00dev = hw->priv;
695         int retval;
696
697         retval = rt2x00lib_suspend(rt2x00dev, state);
698         if (retval)
699                 return retval;
700
701         rt2x00usb_free_reg(rt2x00dev);
702
703         /*
704          * Decrease usbdev refcount.
705          */
706         usb_put_dev(interface_to_usbdev(usb_intf));
707
708         return 0;
709 }
710 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
711
712 int rt2x00usb_resume(struct usb_interface *usb_intf)
713 {
714         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
715         struct rt2x00_dev *rt2x00dev = hw->priv;
716         int retval;
717
718         usb_get_dev(interface_to_usbdev(usb_intf));
719
720         retval = rt2x00usb_alloc_reg(rt2x00dev);
721         if (retval)
722                 return retval;
723
724         retval = rt2x00lib_resume(rt2x00dev);
725         if (retval)
726                 goto exit_free_reg;
727
728         return 0;
729
730 exit_free_reg:
731         rt2x00usb_free_reg(rt2x00dev);
732
733         return retval;
734 }
735 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
736 #endif /* CONFIG_PM */
737
738 /*
739  * rt2x00usb module information.
740  */
741 MODULE_AUTHOR(DRV_PROJECT);
742 MODULE_VERSION(DRV_VERSION);
743 MODULE_DESCRIPTION("rt2x00 usb library");
744 MODULE_LICENSE("GPL");