rt2x00: Determine MY_BSS from descriptor
[deliverable/linux.git] / drivers / net / wireless / rt2x00 / rt2x00usb.c
CommitLineData
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1/*
2 Copyright (C) 2004 - 2007 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
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26#include <linux/kernel.h>
27#include <linux/module.h>
28#include <linux/usb.h>
3d82346c 29#include <linux/bug.h>
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30
31#include "rt2x00.h"
32#include "rt2x00usb.h"
33
34/*
35 * Interfacing with the HW.
36 */
0e14f6d3 37int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
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38 const u8 request, const u8 requesttype,
39 const u16 offset, const u16 value,
40 void *buffer, const u16 buffer_length,
e9136550 41 const int timeout)
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42{
43 struct usb_device *usb_dev =
44 interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
45 int status;
46 unsigned int i;
47 unsigned int pipe =
48 (requesttype == USB_VENDOR_REQUEST_IN) ?
49 usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
50
3d82346c 51
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52 for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
53 status = usb_control_msg(usb_dev, pipe, request, requesttype,
54 value, offset, buffer, buffer_length,
55 timeout);
56 if (status >= 0)
57 return 0;
58
59 /*
e9136550 60 * Check for errors
95ea3627 61 * -ENODEV: Device has disappeared, no point continuing.
e9136550 62 * All other errors: Try again.
95ea3627 63 */
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64 else if (status == -ENODEV)
65 break;
66 }
67
68 ERROR(rt2x00dev,
69 "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
70 request, offset, status);
71
72 return status;
73}
74EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
75
3d82346c
AB
76int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
77 const u8 request, const u8 requesttype,
78 const u16 offset, void *buffer,
79 const u16 buffer_length, const int timeout)
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80{
81 int status;
82
3d82346c
AB
83 BUG_ON(!mutex_is_locked(&rt2x00dev->usb_cache_mutex));
84
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85 /*
86 * Check for Cache availability.
87 */
88 if (unlikely(!rt2x00dev->csr_cache || buffer_length > CSR_CACHE_SIZE)) {
89 ERROR(rt2x00dev, "CSR cache not available.\n");
90 return -ENOMEM;
91 }
92
93 if (requesttype == USB_VENDOR_REQUEST_OUT)
94 memcpy(rt2x00dev->csr_cache, buffer, buffer_length);
95
96 status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
97 offset, 0, rt2x00dev->csr_cache,
98 buffer_length, timeout);
99
100 if (!status && requesttype == USB_VENDOR_REQUEST_IN)
101 memcpy(buffer, rt2x00dev->csr_cache, buffer_length);
102
103 return status;
104}
3d82346c
AB
105EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
106
107int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
108 const u8 request, const u8 requesttype,
109 const u16 offset, void *buffer,
110 const u16 buffer_length, const int timeout)
111{
112 int status;
113
114 mutex_lock(&rt2x00dev->usb_cache_mutex);
115
116 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
117 requesttype, offset, buffer,
118 buffer_length, timeout);
119
120 mutex_unlock(&rt2x00dev->usb_cache_mutex);
121
122 return status;
123}
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124EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
125
126/*
127 * TX data handlers.
128 */
129static void rt2x00usb_interrupt_txdone(struct urb *urb)
130{
131 struct data_entry *entry = (struct data_entry *)urb->context;
132 struct data_ring *ring = entry->ring;
133 struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
4bd7c452 134 __le32 *txd = (__le32 *)entry->skb->data;
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135 u32 word;
136 int tx_status;
137
138 if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
139 !__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
140 return;
141
142 rt2x00_desc_read(txd, 0, &word);
143
144 /*
145 * Remove the descriptor data from the buffer.
146 */
147 skb_pull(entry->skb, ring->desc_size);
148
149 /*
150 * Obtain the status about this packet.
151 */
152 tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
153
154 rt2x00lib_txdone(entry, tx_status, 0);
155
156 /*
157 * Make this entry available for reuse.
158 */
159 entry->flags = 0;
160 rt2x00_ring_index_done_inc(entry->ring);
161
162 /*
163 * If the data ring was full before the txdone handler
164 * we must make sure the packet queue in the mac80211 stack
165 * is reenabled when the txdone handler has finished.
166 */
167 if (!rt2x00_ring_full(ring))
168 ieee80211_wake_queue(rt2x00dev->hw,
169 entry->tx_status.control.queue);
170}
171
172int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
173 struct data_ring *ring, struct sk_buff *skb,
174 struct ieee80211_tx_control *control)
175{
176 struct usb_device *usb_dev =
177 interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
95ea3627 178 struct data_entry *entry = rt2x00_get_data_entry(ring);
08992f7f 179 struct skb_desc *desc;
dd9fa2d2 180 u32 length;
95ea3627 181
1230cb83 182 if (rt2x00_ring_full(ring))
95ea3627 183 return -EINVAL;
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184
185 if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) {
186 ERROR(rt2x00dev,
187 "Arrived at non-free entry in the non-full queue %d.\n"
188 "Please file bug report to %s.\n",
189 control->queue, DRV_PROJECT);
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190 return -EINVAL;
191 }
192
193 /*
194 * Add the descriptor in front of the skb.
195 */
dd9fa2d2
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196 skb_push(skb, ring->desc_size);
197 memset(skb->data, 0, ring->desc_size);
95ea3627 198
08992f7f
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199 /*
200 * Fill in skb descriptor
201 */
202 desc = get_skb_desc(skb);
203 desc->desc_len = ring->desc_size;
204 desc->data_len = skb->len - ring->desc_size;
205 desc->desc = skb->data;
206 desc->data = skb->data + ring->desc_size;
207 desc->ring = ring;
208 desc->entry = entry;
209
210 rt2x00lib_write_tx_desc(rt2x00dev, skb, control);
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211
212 /*
dd9fa2d2
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213 * USB devices cannot blindly pass the skb->len as the
214 * length of the data to usb_fill_bulk_urb. Pass the skb
215 * to the driver to determine what the length should be.
95ea3627 216 */
b242e891 217 length = rt2x00dev->ops->lib->get_tx_data_len(rt2x00dev, skb);
95ea3627 218
dd9fa2d2
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219 /*
220 * Initialize URB and send the frame to the device.
221 */
95ea3627 222 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
08992f7f 223 usb_fill_bulk_urb(entry->priv, usb_dev, usb_sndbulkpipe(usb_dev, 1),
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224 skb->data, length, rt2x00usb_interrupt_txdone, entry);
225 usb_submit_urb(entry->priv, GFP_ATOMIC);
226
227 rt2x00_ring_index_inc(ring);
228
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229 return 0;
230}
231EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
232
233/*
234 * RX data handlers.
235 */
236static void rt2x00usb_interrupt_rxdone(struct urb *urb)
237{
238 struct data_entry *entry = (struct data_entry *)urb->context;
239 struct data_ring *ring = entry->ring;
240 struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
241 struct sk_buff *skb;
c5d0dc5f 242 struct ieee80211_hdr *hdr;
08992f7f 243 struct skb_desc *skbdesc;
4150c572 244 struct rxdata_entry_desc desc;
c5d0dc5f 245 int header_size;
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246 int frame_size;
247
248 if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
249 !test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
250 return;
251
252 /*
253 * Check if the received data is simply too small
254 * to be actually valid, or if the urb is signaling
255 * a problem.
256 */
257 if (urb->actual_length < entry->ring->desc_size || urb->status)
258 goto skip_entry;
259
08992f7f 260 memset(&desc, 0, sizeof(desc));
4150c572 261 rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
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262
263 /*
264 * Allocate a new sk buffer to replace the current one.
265 * If allocation fails, we should drop the current frame
266 * so we can recycle the existing sk buffer for the new frame.
d101f649
ID
267 * As alignment we use 2 and not NET_IP_ALIGN because we need
268 * to be sure we have 2 bytes room in the head. (NET_IP_ALIGN
269 * can be 0 on some hardware). We use these 2 bytes for frame
270 * alignment later, we assume that the chance that
271 * header_size % 4 == 2 is bigger then header_size % 2 == 0
272 * and thus optimize alignment by reserving the 2 bytes in
273 * advance.
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274 */
275 frame_size = entry->ring->data_size + entry->ring->desc_size;
d101f649 276 skb = dev_alloc_skb(frame_size + 2);
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277 if (!skb)
278 goto skip_entry;
279
d101f649 280 skb_reserve(skb, 2);
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281 skb_put(skb, frame_size);
282
283 /*
c5d0dc5f
ID
284 * The data behind the ieee80211 header must be
285 * aligned on a 4 byte boundary.
286 * After that trim the entire buffer down to only
287 * contain the valid frame data excluding the device
288 * descriptor.
95ea3627 289 */
c5d0dc5f
ID
290 hdr = (struct ieee80211_hdr *)entry->skb->data;
291 header_size =
292 ieee80211_get_hdrlen(le16_to_cpu(hdr->frame_control));
293
294 if (header_size % 4 == 0) {
295 skb_push(entry->skb, 2);
296 memmove(entry->skb->data, entry->skb->data + 2, skb->len - 2);
297 }
4150c572 298 skb_trim(entry->skb, desc.size);
95ea3627 299
08992f7f
ID
300 /*
301 * Fill in skb descriptor
302 */
303 skbdesc = get_skb_desc(entry->skb);
4d8dd66c
ID
304 skbdesc->desc_len = entry->ring->desc_size;
305 skbdesc->data_len = entry->skb->len;
306 skbdesc->desc = entry->skb->data - skbdesc->desc_len;
08992f7f
ID
307 skbdesc->data = entry->skb->data;
308 skbdesc->ring = ring;
309 skbdesc->entry = entry;
310
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311 /*
312 * Send the frame to rt2x00lib for further processing.
313 */
4150c572 314 rt2x00lib_rxdone(entry, entry->skb, &desc);
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315
316 /*
317 * Replace current entry's skb with the newly allocated one,
318 * and reinitialize the urb.
319 */
320 entry->skb = skb;
321 urb->transfer_buffer = entry->skb->data;
322 urb->transfer_buffer_length = entry->skb->len;
323
324skip_entry:
325 if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
326 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
327 usb_submit_urb(urb, GFP_ATOMIC);
328 }
329
330 rt2x00_ring_index_inc(ring);
331}
332
333/*
334 * Radio handlers
335 */
336void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev)
337{
338 struct usb_device *usb_dev =
339 interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
340 struct data_ring *ring;
341 struct data_entry *entry;
342 unsigned int i;
343
344 /*
345 * Initialize the TX rings
346 */
347 txringall_for_each(rt2x00dev, ring) {
348 for (i = 0; i < ring->stats.limit; i++)
349 ring->entry[i].flags = 0;
350
351 rt2x00_ring_index_clear(ring);
352 }
353
354 /*
355 * Initialize and start the RX ring.
356 */
357 rt2x00_ring_index_clear(rt2x00dev->rx);
358
359 for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
360 entry = &rt2x00dev->rx->entry[i];
361
362 usb_fill_bulk_urb(entry->priv, usb_dev,
363 usb_rcvbulkpipe(usb_dev, 1),
364 entry->skb->data, entry->skb->len,
365 rt2x00usb_interrupt_rxdone, entry);
366
367 __set_bit(ENTRY_OWNER_NIC, &entry->flags);
368 usb_submit_urb(entry->priv, GFP_ATOMIC);
369 }
370}
371EXPORT_SYMBOL_GPL(rt2x00usb_enable_radio);
372
373void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
374{
375 struct data_ring *ring;
376 unsigned int i;
377
378 rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
379 REGISTER_TIMEOUT);
380
381 /*
382 * Cancel all rings.
383 */
384 ring_for_each(rt2x00dev, ring) {
385 for (i = 0; i < ring->stats.limit; i++)
386 usb_kill_urb(ring->entry[i].priv);
387 }
388}
389EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
390
391/*
392 * Device initialization handlers.
393 */
394static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
395 struct data_ring *ring)
396{
397 unsigned int i;
398
399 /*
400 * Allocate the URB's
401 */
402 for (i = 0; i < ring->stats.limit; i++) {
403 ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL);
404 if (!ring->entry[i].priv)
405 return -ENOMEM;
406 }
407
408 return 0;
409}
410
411static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
412 struct data_ring *ring)
413{
414 unsigned int i;
415
416 if (!ring->entry)
417 return;
418
419 for (i = 0; i < ring->stats.limit; i++) {
420 usb_kill_urb(ring->entry[i].priv);
421 usb_free_urb(ring->entry[i].priv);
422 if (ring->entry[i].skb)
423 kfree_skb(ring->entry[i].skb);
424 }
425}
426
427int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
428{
429 struct data_ring *ring;
430 struct sk_buff *skb;
431 unsigned int entry_size;
432 unsigned int i;
433 int status;
434
435 /*
436 * Allocate DMA
437 */
438 ring_for_each(rt2x00dev, ring) {
439 status = rt2x00usb_alloc_urb(rt2x00dev, ring);
440 if (status)
441 goto exit;
442 }
443
444 /*
445 * For the RX ring, skb's should be allocated.
446 */
447 entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
448 for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
449 skb = dev_alloc_skb(NET_IP_ALIGN + entry_size);
450 if (!skb)
451 goto exit;
452
453 skb_reserve(skb, NET_IP_ALIGN);
454 skb_put(skb, entry_size);
455
456 rt2x00dev->rx->entry[i].skb = skb;
457 }
458
459 return 0;
460
461exit:
462 rt2x00usb_uninitialize(rt2x00dev);
463
464 return status;
465}
466EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
467
468void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
469{
470 struct data_ring *ring;
471
472 ring_for_each(rt2x00dev, ring)
473 rt2x00usb_free_urb(rt2x00dev, ring);
474}
475EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
476
477/*
478 * USB driver handlers.
479 */
480static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
481{
482 kfree(rt2x00dev->rf);
483 rt2x00dev->rf = NULL;
484
485 kfree(rt2x00dev->eeprom);
486 rt2x00dev->eeprom = NULL;
487
488 kfree(rt2x00dev->csr_cache);
489 rt2x00dev->csr_cache = NULL;
490}
491
492static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
493{
494 rt2x00dev->csr_cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
495 if (!rt2x00dev->csr_cache)
496 goto exit;
497
498 rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
499 if (!rt2x00dev->eeprom)
500 goto exit;
501
502 rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
503 if (!rt2x00dev->rf)
504 goto exit;
505
506 return 0;
507
508exit:
509 ERROR_PROBE("Failed to allocate registers.\n");
510
511 rt2x00usb_free_reg(rt2x00dev);
512
513 return -ENOMEM;
514}
515
516int rt2x00usb_probe(struct usb_interface *usb_intf,
517 const struct usb_device_id *id)
518{
519 struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
520 struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
521 struct ieee80211_hw *hw;
522 struct rt2x00_dev *rt2x00dev;
523 int retval;
524
525 usb_dev = usb_get_dev(usb_dev);
526
527 hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
528 if (!hw) {
529 ERROR_PROBE("Failed to allocate hardware.\n");
530 retval = -ENOMEM;
531 goto exit_put_device;
532 }
533
534 usb_set_intfdata(usb_intf, hw);
535
536 rt2x00dev = hw->priv;
537 rt2x00dev->dev = usb_intf;
538 rt2x00dev->ops = ops;
539 rt2x00dev->hw = hw;
3d82346c 540 mutex_init(&rt2x00dev->usb_cache_mutex);
95ea3627 541
b242e891
ID
542 rt2x00dev->usb_maxpacket =
543 usb_maxpacket(usb_dev, usb_sndbulkpipe(usb_dev, 1), 1);
544 if (!rt2x00dev->usb_maxpacket)
545 rt2x00dev->usb_maxpacket = 1;
546
95ea3627
ID
547 retval = rt2x00usb_alloc_reg(rt2x00dev);
548 if (retval)
549 goto exit_free_device;
550
551 retval = rt2x00lib_probe_dev(rt2x00dev);
552 if (retval)
553 goto exit_free_reg;
554
555 return 0;
556
557exit_free_reg:
558 rt2x00usb_free_reg(rt2x00dev);
559
560exit_free_device:
561 ieee80211_free_hw(hw);
562
563exit_put_device:
564 usb_put_dev(usb_dev);
565
566 usb_set_intfdata(usb_intf, NULL);
567
568 return retval;
569}
570EXPORT_SYMBOL_GPL(rt2x00usb_probe);
571
572void rt2x00usb_disconnect(struct usb_interface *usb_intf)
573{
574 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
575 struct rt2x00_dev *rt2x00dev = hw->priv;
576
577 /*
578 * Free all allocated data.
579 */
580 rt2x00lib_remove_dev(rt2x00dev);
581 rt2x00usb_free_reg(rt2x00dev);
582 ieee80211_free_hw(hw);
583
584 /*
585 * Free the USB device data.
586 */
587 usb_set_intfdata(usb_intf, NULL);
588 usb_put_dev(interface_to_usbdev(usb_intf));
589}
590EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
591
592#ifdef CONFIG_PM
593int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
594{
595 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
596 struct rt2x00_dev *rt2x00dev = hw->priv;
597 int retval;
598
599 retval = rt2x00lib_suspend(rt2x00dev, state);
600 if (retval)
601 return retval;
602
603 rt2x00usb_free_reg(rt2x00dev);
604
605 /*
606 * Decrease usbdev refcount.
607 */
608 usb_put_dev(interface_to_usbdev(usb_intf));
609
610 return 0;
611}
612EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
613
614int rt2x00usb_resume(struct usb_interface *usb_intf)
615{
616 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
617 struct rt2x00_dev *rt2x00dev = hw->priv;
618 int retval;
619
620 usb_get_dev(interface_to_usbdev(usb_intf));
621
622 retval = rt2x00usb_alloc_reg(rt2x00dev);
623 if (retval)
624 return retval;
625
626 retval = rt2x00lib_resume(rt2x00dev);
627 if (retval)
628 goto exit_free_reg;
629
630 return 0;
631
632exit_free_reg:
633 rt2x00usb_free_reg(rt2x00dev);
634
635 return retval;
636}
637EXPORT_SYMBOL_GPL(rt2x00usb_resume);
638#endif /* CONFIG_PM */
639
640/*
641 * rt2x00pci module information.
642 */
643MODULE_AUTHOR(DRV_PROJECT);
644MODULE_VERSION(DRV_VERSION);
645MODULE_DESCRIPTION("rt2x00 library");
646MODULE_LICENSE("GPL");
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