rt2x00: Protect queue control with mutex
[linux-2.6.git] / drivers / net / wireless / rt2x00 / rt2x00usb.c
1 /*
2         Copyright (C) 2010 Willow Garage <http://www.willowgarage.com>
3         Copyright (C) 2004 - 2010 Ivo van Doorn <IvDoorn@gmail.com>
4         <http://rt2x00.serialmonkey.com>
5
6         This program is free software; you can redistribute it and/or modify
7         it under the terms of the GNU General Public License as published by
8         the Free Software Foundation; either version 2 of the License, or
9         (at your option) any later version.
10
11         This program is distributed in the hope that it will be useful,
12         but WITHOUT ANY WARRANTY; without even the implied warranty of
13         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14         GNU General Public License for more details.
15
16         You should have received a copy of the GNU General Public License
17         along with this program; if not, write to the
18         Free Software Foundation, Inc.,
19         59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20  */
21
22 /*
23         Module: rt2x00usb
24         Abstract: rt2x00 generic usb device routines.
25  */
26
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/slab.h>
30 #include <linux/usb.h>
31 #include <linux/bug.h>
32
33 #include "rt2x00.h"
34 #include "rt2x00usb.h"
35
36 /*
37  * Interfacing with the HW.
38  */
39 int rt2x00usb_vendor_request(struct rt2x00_dev *rt2x00dev,
40                              const u8 request, const u8 requesttype,
41                              const u16 offset, const u16 value,
42                              void *buffer, const u16 buffer_length,
43                              const int timeout)
44 {
45         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
46         int status;
47         unsigned int i;
48         unsigned int pipe =
49             (requesttype == USB_VENDOR_REQUEST_IN) ?
50             usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
51
52         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
53                 return -ENODEV;
54
55         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
56                 status = usb_control_msg(usb_dev, pipe, request, requesttype,
57                                          value, offset, buffer, buffer_length,
58                                          timeout);
59                 if (status >= 0)
60                         return 0;
61
62                 /*
63                  * Check for errors
64                  * -ENODEV: Device has disappeared, no point continuing.
65                  * All other errors: Try again.
66                  */
67                 else if (status == -ENODEV) {
68                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
69                         break;
70                 }
71         }
72
73         ERROR(rt2x00dev,
74               "Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
75               request, offset, status);
76
77         return status;
78 }
79 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
80
81 int rt2x00usb_vendor_req_buff_lock(struct rt2x00_dev *rt2x00dev,
82                                    const u8 request, const u8 requesttype,
83                                    const u16 offset, void *buffer,
84                                    const u16 buffer_length, const int timeout)
85 {
86         int status;
87
88         BUG_ON(!mutex_is_locked(&rt2x00dev->csr_mutex));
89
90         /*
91          * Check for Cache availability.
92          */
93         if (unlikely(!rt2x00dev->csr.cache || buffer_length > CSR_CACHE_SIZE)) {
94                 ERROR(rt2x00dev, "CSR cache not available.\n");
95                 return -ENOMEM;
96         }
97
98         if (requesttype == USB_VENDOR_REQUEST_OUT)
99                 memcpy(rt2x00dev->csr.cache, buffer, buffer_length);
100
101         status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
102                                           offset, 0, rt2x00dev->csr.cache,
103                                           buffer_length, timeout);
104
105         if (!status && requesttype == USB_VENDOR_REQUEST_IN)
106                 memcpy(buffer, rt2x00dev->csr.cache, buffer_length);
107
108         return status;
109 }
110 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
111
112 int rt2x00usb_vendor_request_buff(struct rt2x00_dev *rt2x00dev,
113                                   const u8 request, const u8 requesttype,
114                                   const u16 offset, void *buffer,
115                                   const u16 buffer_length, const int timeout)
116 {
117         int status = 0;
118         unsigned char *tb;
119         u16 off, len, bsize;
120
121         mutex_lock(&rt2x00dev->csr_mutex);
122
123         tb  = (char *)buffer;
124         off = offset;
125         len = buffer_length;
126         while (len && !status) {
127                 bsize = min_t(u16, CSR_CACHE_SIZE, len);
128                 status = rt2x00usb_vendor_req_buff_lock(rt2x00dev, request,
129                                                         requesttype, off, tb,
130                                                         bsize, timeout);
131
132                 tb  += bsize;
133                 len -= bsize;
134                 off += bsize;
135         }
136
137         mutex_unlock(&rt2x00dev->csr_mutex);
138
139         return status;
140 }
141 EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
142
143 int rt2x00usb_regbusy_read(struct rt2x00_dev *rt2x00dev,
144                            const unsigned int offset,
145                            const struct rt2x00_field32 field,
146                            u32 *reg)
147 {
148         unsigned int i;
149
150         if (!test_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
151                 return -ENODEV;
152
153         for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
154                 rt2x00usb_register_read_lock(rt2x00dev, offset, reg);
155                 if (!rt2x00_get_field32(*reg, field))
156                         return 1;
157                 udelay(REGISTER_BUSY_DELAY);
158         }
159
160         ERROR(rt2x00dev, "Indirect register access failed: "
161               "offset=0x%.08x, value=0x%.08x\n", offset, *reg);
162         *reg = ~0;
163
164         return 0;
165 }
166 EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
167
168 /*
169  * TX data handlers.
170  */
171 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
172 {
173         /*
174          * If the transfer to hardware succeeded, it does not mean the
175          * frame was send out correctly. It only means the frame
176          * was succesfully pushed to the hardware, we have no
177          * way to determine the transmission status right now.
178          * (Only indirectly by looking at the failed TX counters
179          * in the register).
180          */
181         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
182                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
183         else
184                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
185 }
186
187 static void rt2x00usb_work_txdone(struct work_struct *work)
188 {
189         struct rt2x00_dev *rt2x00dev =
190             container_of(work, struct rt2x00_dev, txdone_work);
191         struct data_queue *queue;
192         struct queue_entry *entry;
193
194         tx_queue_for_each(rt2x00dev, queue) {
195                 while (!rt2x00queue_empty(queue)) {
196                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
197
198                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
199                                 break;
200
201                         rt2x00usb_work_txdone_entry(entry);
202                 }
203         }
204 }
205
206 static void rt2x00usb_interrupt_txdone(struct urb *urb)
207 {
208         struct queue_entry *entry = (struct queue_entry *)urb->context;
209         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
210
211         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
212                 return;
213
214         /*
215          * Report the frame as DMA done
216          */
217         rt2x00lib_dmadone(entry);
218
219         /*
220          * Check if the frame was correctly uploaded
221          */
222         if (urb->status)
223                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
224
225         /*
226          * Schedule the delayed work for reading the TX status
227          * from the device.
228          */
229         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->txdone_work);
230 }
231
232 static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
233 {
234         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
235         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
236         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
237         u32 length;
238         int status;
239
240         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags))
241                 return;
242
243         /*
244          * USB devices cannot blindly pass the skb->len as the
245          * length of the data to usb_fill_bulk_urb. Pass the skb
246          * to the driver to determine what the length should be.
247          */
248         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
249
250         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
251                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
252                           entry->skb->data, length,
253                           rt2x00usb_interrupt_txdone, entry);
254
255         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
256         if (status) {
257                 if (status == -ENODEV)
258                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
259                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
260                 rt2x00lib_dmadone(entry);
261         }
262 }
263
264 /*
265  * RX data handlers.
266  */
267 static void rt2x00usb_work_rxdone(struct work_struct *work)
268 {
269         struct rt2x00_dev *rt2x00dev =
270             container_of(work, struct rt2x00_dev, rxdone_work);
271         struct queue_entry *entry;
272         struct skb_frame_desc *skbdesc;
273         u8 rxd[32];
274
275         while (!rt2x00queue_empty(rt2x00dev->rx)) {
276                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
277
278                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
279                         break;
280
281                 /*
282                  * Fill in desc fields of the skb descriptor
283                  */
284                 skbdesc = get_skb_frame_desc(entry->skb);
285                 skbdesc->desc = rxd;
286                 skbdesc->desc_len = entry->queue->desc_size;
287
288                 /*
289                  * Send the frame to rt2x00lib for further processing.
290                  */
291                 rt2x00lib_rxdone(entry);
292         }
293 }
294
295 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
296 {
297         struct queue_entry *entry = (struct queue_entry *)urb->context;
298         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
299
300         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
301                 return;
302
303         /*
304          * Report the frame as DMA done
305          */
306         rt2x00lib_dmadone(entry);
307
308         /*
309          * Check if the received data is simply too small
310          * to be actually valid, or if the urb is signaling
311          * a problem.
312          */
313         if (urb->actual_length < entry->queue->desc_size || urb->status)
314                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
315
316         /*
317          * Schedule the delayed work for reading the RX status
318          * from the device.
319          */
320         ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->rxdone_work);
321 }
322
323 static void rt2x00usb_kick_rx_entry(struct queue_entry *entry)
324 {
325         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
326         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
327         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
328         int status;
329
330         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
331                 return;
332
333         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
334                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
335                           entry->skb->data, entry->skb->len,
336                           rt2x00usb_interrupt_rxdone, entry);
337
338         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
339         if (status) {
340                 if (status == -ENODEV)
341                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
342                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
343                 rt2x00lib_dmadone(entry);
344         }
345 }
346
347 void rt2x00usb_kick_queue(struct data_queue *queue)
348 {
349         switch (queue->qid) {
350         case QID_AC_BE:
351         case QID_AC_BK:
352         case QID_AC_VI:
353         case QID_AC_VO:
354                 if (!rt2x00queue_empty(queue))
355                         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
356                                                    rt2x00usb_kick_tx_entry);
357                 break;
358         case QID_RX:
359                 if (!rt2x00queue_full(queue))
360                         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
361                                                    rt2x00usb_kick_rx_entry);
362                 break;
363         default:
364                 break;
365         }
366 }
367 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
368
369 static void rt2x00usb_kill_entry(struct queue_entry *entry)
370 {
371         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
372         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
373         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
374
375         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
376                 return;
377
378         usb_kill_urb(entry_priv->urb);
379
380         /*
381          * Kill guardian urb (if required by driver).
382          */
383         if ((entry->queue->qid == QID_BEACON) &&
384             (test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags)))
385                 usb_kill_urb(bcn_priv->guardian_urb);
386 }
387
388 void rt2x00usb_stop_queue(struct data_queue *queue)
389 {
390         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
391                                    rt2x00usb_kill_entry);
392 }
393 EXPORT_SYMBOL_GPL(rt2x00usb_stop_queue);
394
395 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
396 {
397         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
398
399         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
400                 " invoke forced forced reset\n", queue->qid);
401
402         /*
403          * Temporarily disable the TX queue, this will force mac80211
404          * to use the other queues until this queue has been restored.
405          */
406         rt2x00queue_stop_queue(queue);
407
408         /*
409          * In case that a driver has overriden the txdone_work
410          * function, we invoke the TX done through there.
411          */
412         rt2x00dev->txdone_work.func(&rt2x00dev->txdone_work);
413
414         /*
415          * The queue has been reset, and mac80211 is allowed to use the
416          * queue again.
417          */
418         rt2x00queue_start_queue(queue);
419 }
420
421 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
422 {
423         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
424                 " invoke forced tx handler\n", queue->qid);
425
426         ieee80211_queue_work(queue->rt2x00dev->hw, &queue->rt2x00dev->txdone_work);
427 }
428
429 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
430 {
431         struct data_queue *queue;
432
433         tx_queue_for_each(rt2x00dev, queue) {
434                 if (!rt2x00queue_empty(queue)) {
435                         if (rt2x00queue_dma_timeout(queue))
436                                 rt2x00usb_watchdog_tx_dma(queue);
437                         if (rt2x00queue_status_timeout(queue))
438                                 rt2x00usb_watchdog_tx_status(queue);
439                 }
440         }
441 }
442 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
443
444 /*
445  * Radio handlers
446  */
447 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
448 {
449         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
450                                     REGISTER_TIMEOUT);
451 }
452 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
453
454 /*
455  * Device initialization handlers.
456  */
457 void rt2x00usb_clear_entry(struct queue_entry *entry)
458 {
459         entry->flags = 0;
460
461         if (entry->queue->qid == QID_RX)
462                 rt2x00usb_kick_rx_entry(entry);
463 }
464 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
465
466 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
467                                       struct usb_endpoint_descriptor *ep_desc)
468 {
469         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
470         int pipe;
471
472         queue->usb_endpoint = usb_endpoint_num(ep_desc);
473
474         if (queue->qid == QID_RX) {
475                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
476                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
477         } else {
478                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
479                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
480         }
481
482         if (!queue->usb_maxpacket)
483                 queue->usb_maxpacket = 1;
484 }
485
486 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
487 {
488         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
489         struct usb_host_interface *intf_desc = intf->cur_altsetting;
490         struct usb_endpoint_descriptor *ep_desc;
491         struct data_queue *queue = rt2x00dev->tx;
492         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
493         unsigned int i;
494
495         /*
496          * Walk through all available endpoints to search for "bulk in"
497          * and "bulk out" endpoints. When we find such endpoints collect
498          * the information we need from the descriptor and assign it
499          * to the queue.
500          */
501         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
502                 ep_desc = &intf_desc->endpoint[i].desc;
503
504                 if (usb_endpoint_is_bulk_in(ep_desc)) {
505                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
506                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
507                            (queue != queue_end(rt2x00dev))) {
508                         rt2x00usb_assign_endpoint(queue, ep_desc);
509                         queue = queue_next(queue);
510
511                         tx_ep_desc = ep_desc;
512                 }
513         }
514
515         /*
516          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
517          */
518         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
519                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
520                 return -EPIPE;
521         }
522
523         /*
524          * It might be possible not all queues have a dedicated endpoint.
525          * Loop through all TX queues and copy the endpoint information
526          * which we have gathered from already assigned endpoints.
527          */
528         txall_queue_for_each(rt2x00dev, queue) {
529                 if (!queue->usb_endpoint)
530                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
531         }
532
533         return 0;
534 }
535
536 static int rt2x00usb_alloc_entries(struct data_queue *queue)
537 {
538         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
539         struct queue_entry_priv_usb *entry_priv;
540         struct queue_entry_priv_usb_bcn *bcn_priv;
541         unsigned int i;
542
543         for (i = 0; i < queue->limit; i++) {
544                 entry_priv = queue->entries[i].priv_data;
545                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
546                 if (!entry_priv->urb)
547                         return -ENOMEM;
548         }
549
550         /*
551          * If this is not the beacon queue or
552          * no guardian byte was required for the beacon,
553          * then we are done.
554          */
555         if (queue->qid != QID_BEACON ||
556             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
557                 return 0;
558
559         for (i = 0; i < queue->limit; i++) {
560                 bcn_priv = queue->entries[i].priv_data;
561                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
562                 if (!bcn_priv->guardian_urb)
563                         return -ENOMEM;
564         }
565
566         return 0;
567 }
568
569 static void rt2x00usb_free_entries(struct data_queue *queue)
570 {
571         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
572         struct queue_entry_priv_usb *entry_priv;
573         struct queue_entry_priv_usb_bcn *bcn_priv;
574         unsigned int i;
575
576         if (!queue->entries)
577                 return;
578
579         for (i = 0; i < queue->limit; i++) {
580                 entry_priv = queue->entries[i].priv_data;
581                 usb_kill_urb(entry_priv->urb);
582                 usb_free_urb(entry_priv->urb);
583         }
584
585         /*
586          * If this is not the beacon queue or
587          * no guardian byte was required for the beacon,
588          * then we are done.
589          */
590         if (queue->qid != QID_BEACON ||
591             !test_bit(DRIVER_REQUIRE_BEACON_GUARD, &rt2x00dev->flags))
592                 return;
593
594         for (i = 0; i < queue->limit; i++) {
595                 bcn_priv = queue->entries[i].priv_data;
596                 usb_kill_urb(bcn_priv->guardian_urb);
597                 usb_free_urb(bcn_priv->guardian_urb);
598         }
599 }
600
601 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
602 {
603         struct data_queue *queue;
604         int status;
605
606         /*
607          * Find endpoints for each queue
608          */
609         status = rt2x00usb_find_endpoints(rt2x00dev);
610         if (status)
611                 goto exit;
612
613         /*
614          * Allocate DMA
615          */
616         queue_for_each(rt2x00dev, queue) {
617                 status = rt2x00usb_alloc_entries(queue);
618                 if (status)
619                         goto exit;
620         }
621
622         return 0;
623
624 exit:
625         rt2x00usb_uninitialize(rt2x00dev);
626
627         return status;
628 }
629 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
630
631 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
632 {
633         struct data_queue *queue;
634
635         queue_for_each(rt2x00dev, queue)
636                 rt2x00usb_free_entries(queue);
637 }
638 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
639
640 /*
641  * USB driver handlers.
642  */
643 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
644 {
645         kfree(rt2x00dev->rf);
646         rt2x00dev->rf = NULL;
647
648         kfree(rt2x00dev->eeprom);
649         rt2x00dev->eeprom = NULL;
650
651         kfree(rt2x00dev->csr.cache);
652         rt2x00dev->csr.cache = NULL;
653 }
654
655 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
656 {
657         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
658         if (!rt2x00dev->csr.cache)
659                 goto exit;
660
661         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
662         if (!rt2x00dev->eeprom)
663                 goto exit;
664
665         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
666         if (!rt2x00dev->rf)
667                 goto exit;
668
669         return 0;
670
671 exit:
672         ERROR_PROBE("Failed to allocate registers.\n");
673
674         rt2x00usb_free_reg(rt2x00dev);
675
676         return -ENOMEM;
677 }
678
679 int rt2x00usb_probe(struct usb_interface *usb_intf,
680                     const struct usb_device_id *id)
681 {
682         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
683         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
684         struct ieee80211_hw *hw;
685         struct rt2x00_dev *rt2x00dev;
686         int retval;
687
688         usb_dev = usb_get_dev(usb_dev);
689
690         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
691         if (!hw) {
692                 ERROR_PROBE("Failed to allocate hardware.\n");
693                 retval = -ENOMEM;
694                 goto exit_put_device;
695         }
696
697         usb_set_intfdata(usb_intf, hw);
698
699         rt2x00dev = hw->priv;
700         rt2x00dev->dev = &usb_intf->dev;
701         rt2x00dev->ops = ops;
702         rt2x00dev->hw = hw;
703
704         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
705
706         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
707         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
708
709         retval = rt2x00usb_alloc_reg(rt2x00dev);
710         if (retval)
711                 goto exit_free_device;
712
713         retval = rt2x00lib_probe_dev(rt2x00dev);
714         if (retval)
715                 goto exit_free_reg;
716
717         return 0;
718
719 exit_free_reg:
720         rt2x00usb_free_reg(rt2x00dev);
721
722 exit_free_device:
723         ieee80211_free_hw(hw);
724
725 exit_put_device:
726         usb_put_dev(usb_dev);
727
728         usb_set_intfdata(usb_intf, NULL);
729
730         return retval;
731 }
732 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
733
734 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
735 {
736         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
737         struct rt2x00_dev *rt2x00dev = hw->priv;
738
739         /*
740          * Free all allocated data.
741          */
742         rt2x00lib_remove_dev(rt2x00dev);
743         rt2x00usb_free_reg(rt2x00dev);
744         ieee80211_free_hw(hw);
745
746         /*
747          * Free the USB device data.
748          */
749         usb_set_intfdata(usb_intf, NULL);
750         usb_put_dev(interface_to_usbdev(usb_intf));
751 }
752 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
753
754 #ifdef CONFIG_PM
755 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
756 {
757         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
758         struct rt2x00_dev *rt2x00dev = hw->priv;
759         int retval;
760
761         retval = rt2x00lib_suspend(rt2x00dev, state);
762         if (retval)
763                 return retval;
764
765         /*
766          * Decrease usbdev refcount.
767          */
768         usb_put_dev(interface_to_usbdev(usb_intf));
769
770         return 0;
771 }
772 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
773
774 int rt2x00usb_resume(struct usb_interface *usb_intf)
775 {
776         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
777         struct rt2x00_dev *rt2x00dev = hw->priv;
778
779         usb_get_dev(interface_to_usbdev(usb_intf));
780
781         return rt2x00lib_resume(rt2x00dev);
782 }
783 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
784 #endif /* CONFIG_PM */
785
786 /*
787  * rt2x00usb module information.
788  */
789 MODULE_AUTHOR(DRV_PROJECT);
790 MODULE_VERSION(DRV_VERSION);
791 MODULE_DESCRIPTION("rt2x00 usb library");
792 MODULE_LICENSE("GPL");