rt2x00: Split rt2x00dev->flags
[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                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
200                                 break;
201
202                         rt2x00usb_work_txdone_entry(entry);
203                 }
204         }
205 }
206
207 static void rt2x00usb_interrupt_txdone(struct urb *urb)
208 {
209         struct queue_entry *entry = (struct queue_entry *)urb->context;
210         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
211
212         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
213                 return;
214
215         /*
216          * Report the frame as DMA done
217          */
218         rt2x00lib_dmadone(entry);
219
220         /*
221          * Check if the frame was correctly uploaded
222          */
223         if (urb->status)
224                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
225
226         /*
227          * Schedule the delayed work for reading the TX status
228          * from the device.
229          */
230         queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
231 }
232
233 static void rt2x00usb_kick_tx_entry(struct queue_entry *entry)
234 {
235         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
236         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
237         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
238         u32 length;
239         int status;
240
241         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
242             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
243                 return;
244
245         /*
246          * USB devices cannot blindly pass the skb->len as the
247          * length of the data to usb_fill_bulk_urb. Pass the skb
248          * to the driver to determine what the length should be.
249          */
250         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
251
252         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
253                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
254                           entry->skb->data, length,
255                           rt2x00usb_interrupt_txdone, entry);
256
257         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
258         if (status) {
259                 if (status == -ENODEV)
260                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
261                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
262                 rt2x00lib_dmadone(entry);
263         }
264 }
265
266 /*
267  * RX data handlers.
268  */
269 static void rt2x00usb_work_rxdone(struct work_struct *work)
270 {
271         struct rt2x00_dev *rt2x00dev =
272             container_of(work, struct rt2x00_dev, rxdone_work);
273         struct queue_entry *entry;
274         struct skb_frame_desc *skbdesc;
275         u8 rxd[32];
276
277         while (!rt2x00queue_empty(rt2x00dev->rx)) {
278                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
279
280                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
281                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
282                         break;
283
284                 /*
285                  * Fill in desc fields of the skb descriptor
286                  */
287                 skbdesc = get_skb_frame_desc(entry->skb);
288                 skbdesc->desc = rxd;
289                 skbdesc->desc_len = entry->queue->desc_size;
290
291                 /*
292                  * Send the frame to rt2x00lib for further processing.
293                  */
294                 rt2x00lib_rxdone(entry);
295         }
296 }
297
298 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
299 {
300         struct queue_entry *entry = (struct queue_entry *)urb->context;
301         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
302
303         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
304                 return;
305
306         /*
307          * Report the frame as DMA done
308          */
309         rt2x00lib_dmadone(entry);
310
311         /*
312          * Check if the received data is simply too small
313          * to be actually valid, or if the urb is signaling
314          * a problem.
315          */
316         if (urb->actual_length < entry->queue->desc_size || urb->status)
317                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
318
319         /*
320          * Schedule the delayed work for reading the RX status
321          * from the device.
322          */
323         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
324 }
325
326 static void rt2x00usb_kick_rx_entry(struct queue_entry *entry)
327 {
328         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
329         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
330         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
331         int status;
332
333         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
334             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
335                 return;
336
337         rt2x00lib_dmastart(entry);
338
339         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
340                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
341                           entry->skb->data, entry->skb->len,
342                           rt2x00usb_interrupt_rxdone, entry);
343
344         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
345         if (status) {
346                 if (status == -ENODEV)
347                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
348                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
349                 rt2x00lib_dmadone(entry);
350         }
351 }
352
353 void rt2x00usb_kick_queue(struct data_queue *queue)
354 {
355         switch (queue->qid) {
356         case QID_AC_VO:
357         case QID_AC_VI:
358         case QID_AC_BE:
359         case QID_AC_BK:
360                 if (!rt2x00queue_empty(queue))
361                         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
362                                                    rt2x00usb_kick_tx_entry);
363                 break;
364         case QID_RX:
365                 if (!rt2x00queue_full(queue))
366                         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
367                                                    rt2x00usb_kick_rx_entry);
368                 break;
369         default:
370                 break;
371         }
372 }
373 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
374
375 static void rt2x00usb_flush_entry(struct queue_entry *entry)
376 {
377         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
378         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
379         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
380
381         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
382                 return;
383
384         usb_kill_urb(entry_priv->urb);
385
386         /*
387          * Kill guardian urb (if required by driver).
388          */
389         if ((entry->queue->qid == QID_BEACON) &&
390             (test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags)))
391                 usb_kill_urb(bcn_priv->guardian_urb);
392 }
393
394 void rt2x00usb_flush_queue(struct data_queue *queue)
395 {
396         struct work_struct *completion;
397         unsigned int i;
398
399         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX,
400                                    rt2x00usb_flush_entry);
401
402         /*
403          * Obtain the queue completion handler
404          */
405         switch (queue->qid) {
406         case QID_AC_VO:
407         case QID_AC_VI:
408         case QID_AC_BE:
409         case QID_AC_BK:
410                 completion = &queue->rt2x00dev->txdone_work;
411                 break;
412         case QID_RX:
413                 completion = &queue->rt2x00dev->rxdone_work;
414                 break;
415         default:
416                 return;
417         }
418
419         for (i = 0; i < 20; i++) {
420                 /*
421                  * Check if the driver is already done, otherwise we
422                  * have to sleep a little while to give the driver/hw
423                  * the oppurtunity to complete interrupt process itself.
424                  */
425                 if (rt2x00queue_empty(queue))
426                         break;
427
428                 /*
429                  * Schedule the completion handler manually, when this
430                  * worker function runs, it should cleanup the queue.
431                  */
432                 queue_work(queue->rt2x00dev->workqueue, completion);
433
434                 /*
435                  * Wait for a little while to give the driver
436                  * the oppurtunity to recover itself.
437                  */
438                 msleep(10);
439         }
440 }
441 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
442
443 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
444 {
445         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
446                 " invoke forced forced reset\n", queue->qid);
447
448         rt2x00queue_flush_queue(queue, true);
449 }
450
451 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
452 {
453         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
454                 " invoke forced tx handler\n", queue->qid);
455
456         queue_work(queue->rt2x00dev->workqueue, &queue->rt2x00dev->txdone_work);
457 }
458
459 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
460 {
461         struct data_queue *queue;
462
463         tx_queue_for_each(rt2x00dev, queue) {
464                 if (!rt2x00queue_empty(queue)) {
465                         if (rt2x00queue_dma_timeout(queue))
466                                 rt2x00usb_watchdog_tx_dma(queue);
467                         if (rt2x00queue_status_timeout(queue))
468                                 rt2x00usb_watchdog_tx_status(queue);
469                 }
470         }
471 }
472 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
473
474 /*
475  * Radio handlers
476  */
477 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
478 {
479         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
480                                     REGISTER_TIMEOUT);
481 }
482 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
483
484 /*
485  * Device initialization handlers.
486  */
487 void rt2x00usb_clear_entry(struct queue_entry *entry)
488 {
489         entry->flags = 0;
490
491         if (entry->queue->qid == QID_RX)
492                 rt2x00usb_kick_rx_entry(entry);
493 }
494 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
495
496 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
497                                       struct usb_endpoint_descriptor *ep_desc)
498 {
499         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
500         int pipe;
501
502         queue->usb_endpoint = usb_endpoint_num(ep_desc);
503
504         if (queue->qid == QID_RX) {
505                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
506                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
507         } else {
508                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
509                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
510         }
511
512         if (!queue->usb_maxpacket)
513                 queue->usb_maxpacket = 1;
514 }
515
516 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
517 {
518         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
519         struct usb_host_interface *intf_desc = intf->cur_altsetting;
520         struct usb_endpoint_descriptor *ep_desc;
521         struct data_queue *queue = rt2x00dev->tx;
522         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
523         unsigned int i;
524
525         /*
526          * Walk through all available endpoints to search for "bulk in"
527          * and "bulk out" endpoints. When we find such endpoints collect
528          * the information we need from the descriptor and assign it
529          * to the queue.
530          */
531         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
532                 ep_desc = &intf_desc->endpoint[i].desc;
533
534                 if (usb_endpoint_is_bulk_in(ep_desc)) {
535                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
536                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
537                            (queue != queue_end(rt2x00dev))) {
538                         rt2x00usb_assign_endpoint(queue, ep_desc);
539                         queue = queue_next(queue);
540
541                         tx_ep_desc = ep_desc;
542                 }
543         }
544
545         /*
546          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
547          */
548         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
549                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
550                 return -EPIPE;
551         }
552
553         /*
554          * It might be possible not all queues have a dedicated endpoint.
555          * Loop through all TX queues and copy the endpoint information
556          * which we have gathered from already assigned endpoints.
557          */
558         txall_queue_for_each(rt2x00dev, queue) {
559                 if (!queue->usb_endpoint)
560                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
561         }
562
563         return 0;
564 }
565
566 static int rt2x00usb_alloc_entries(struct data_queue *queue)
567 {
568         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
569         struct queue_entry_priv_usb *entry_priv;
570         struct queue_entry_priv_usb_bcn *bcn_priv;
571         unsigned int i;
572
573         for (i = 0; i < queue->limit; i++) {
574                 entry_priv = queue->entries[i].priv_data;
575                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
576                 if (!entry_priv->urb)
577                         return -ENOMEM;
578         }
579
580         /*
581          * If this is not the beacon queue or
582          * no guardian byte was required for the beacon,
583          * then we are done.
584          */
585         if (queue->qid != QID_BEACON ||
586             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
587                 return 0;
588
589         for (i = 0; i < queue->limit; i++) {
590                 bcn_priv = queue->entries[i].priv_data;
591                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
592                 if (!bcn_priv->guardian_urb)
593                         return -ENOMEM;
594         }
595
596         return 0;
597 }
598
599 static void rt2x00usb_free_entries(struct data_queue *queue)
600 {
601         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
602         struct queue_entry_priv_usb *entry_priv;
603         struct queue_entry_priv_usb_bcn *bcn_priv;
604         unsigned int i;
605
606         if (!queue->entries)
607                 return;
608
609         for (i = 0; i < queue->limit; i++) {
610                 entry_priv = queue->entries[i].priv_data;
611                 usb_kill_urb(entry_priv->urb);
612                 usb_free_urb(entry_priv->urb);
613         }
614
615         /*
616          * If this is not the beacon queue or
617          * no guardian byte was required for the beacon,
618          * then we are done.
619          */
620         if (queue->qid != QID_BEACON ||
621             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
622                 return;
623
624         for (i = 0; i < queue->limit; i++) {
625                 bcn_priv = queue->entries[i].priv_data;
626                 usb_kill_urb(bcn_priv->guardian_urb);
627                 usb_free_urb(bcn_priv->guardian_urb);
628         }
629 }
630
631 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
632 {
633         struct data_queue *queue;
634         int status;
635
636         /*
637          * Find endpoints for each queue
638          */
639         status = rt2x00usb_find_endpoints(rt2x00dev);
640         if (status)
641                 goto exit;
642
643         /*
644          * Allocate DMA
645          */
646         queue_for_each(rt2x00dev, queue) {
647                 status = rt2x00usb_alloc_entries(queue);
648                 if (status)
649                         goto exit;
650         }
651
652         return 0;
653
654 exit:
655         rt2x00usb_uninitialize(rt2x00dev);
656
657         return status;
658 }
659 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
660
661 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
662 {
663         struct data_queue *queue;
664
665         queue_for_each(rt2x00dev, queue)
666                 rt2x00usb_free_entries(queue);
667 }
668 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
669
670 /*
671  * USB driver handlers.
672  */
673 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
674 {
675         kfree(rt2x00dev->rf);
676         rt2x00dev->rf = NULL;
677
678         kfree(rt2x00dev->eeprom);
679         rt2x00dev->eeprom = NULL;
680
681         kfree(rt2x00dev->csr.cache);
682         rt2x00dev->csr.cache = NULL;
683 }
684
685 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
686 {
687         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
688         if (!rt2x00dev->csr.cache)
689                 goto exit;
690
691         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
692         if (!rt2x00dev->eeprom)
693                 goto exit;
694
695         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
696         if (!rt2x00dev->rf)
697                 goto exit;
698
699         return 0;
700
701 exit:
702         ERROR_PROBE("Failed to allocate registers.\n");
703
704         rt2x00usb_free_reg(rt2x00dev);
705
706         return -ENOMEM;
707 }
708
709 int rt2x00usb_probe(struct usb_interface *usb_intf,
710                     const struct usb_device_id *id)
711 {
712         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
713         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
714         struct ieee80211_hw *hw;
715         struct rt2x00_dev *rt2x00dev;
716         int retval;
717
718         usb_dev = usb_get_dev(usb_dev);
719
720         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
721         if (!hw) {
722                 ERROR_PROBE("Failed to allocate hardware.\n");
723                 retval = -ENOMEM;
724                 goto exit_put_device;
725         }
726
727         usb_set_intfdata(usb_intf, hw);
728
729         rt2x00dev = hw->priv;
730         rt2x00dev->dev = &usb_intf->dev;
731         rt2x00dev->ops = ops;
732         rt2x00dev->hw = hw;
733
734         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
735
736         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
737         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
738
739         retval = rt2x00usb_alloc_reg(rt2x00dev);
740         if (retval)
741                 goto exit_free_device;
742
743         retval = rt2x00lib_probe_dev(rt2x00dev);
744         if (retval)
745                 goto exit_free_reg;
746
747         return 0;
748
749 exit_free_reg:
750         rt2x00usb_free_reg(rt2x00dev);
751
752 exit_free_device:
753         ieee80211_free_hw(hw);
754
755 exit_put_device:
756         usb_put_dev(usb_dev);
757
758         usb_set_intfdata(usb_intf, NULL);
759
760         return retval;
761 }
762 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
763
764 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
765 {
766         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
767         struct rt2x00_dev *rt2x00dev = hw->priv;
768
769         /*
770          * Free all allocated data.
771          */
772         rt2x00lib_remove_dev(rt2x00dev);
773         rt2x00usb_free_reg(rt2x00dev);
774         ieee80211_free_hw(hw);
775
776         /*
777          * Free the USB device data.
778          */
779         usb_set_intfdata(usb_intf, NULL);
780         usb_put_dev(interface_to_usbdev(usb_intf));
781 }
782 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
783
784 #ifdef CONFIG_PM
785 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
786 {
787         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
788         struct rt2x00_dev *rt2x00dev = hw->priv;
789         int retval;
790
791         retval = rt2x00lib_suspend(rt2x00dev, state);
792         if (retval)
793                 return retval;
794
795         /*
796          * Decrease usbdev refcount.
797          */
798         usb_put_dev(interface_to_usbdev(usb_intf));
799
800         return 0;
801 }
802 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
803
804 int rt2x00usb_resume(struct usb_interface *usb_intf)
805 {
806         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
807         struct rt2x00_dev *rt2x00dev = hw->priv;
808
809         usb_get_dev(interface_to_usbdev(usb_intf));
810
811         return rt2x00lib_resume(rt2x00dev);
812 }
813 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
814 #endif /* CONFIG_PM */
815
816 /*
817  * rt2x00usb module information.
818  */
819 MODULE_AUTHOR(DRV_PROJECT);
820 MODULE_VERSION(DRV_VERSION);
821 MODULE_DESCRIPTION("rt2x00 usb library");
822 MODULE_LICENSE("GPL");