Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[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 struct rt2x00_async_read_data {
170         __le32 reg;
171         struct usb_ctrlrequest cr;
172         struct rt2x00_dev *rt2x00dev;
173         bool (*callback)(struct rt2x00_dev *, int, u32);
174 };
175
176 static void rt2x00usb_register_read_async_cb(struct urb *urb)
177 {
178         struct rt2x00_async_read_data *rd = urb->context;
179         if (rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg))) {
180                 if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
181                         kfree(rd);
182         } else
183                 kfree(rd);
184 }
185
186 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
187                                    const unsigned int offset,
188                                    bool (*callback)(struct rt2x00_dev*, int, u32))
189 {
190         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
191         struct urb *urb;
192         struct rt2x00_async_read_data *rd;
193
194         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
195         if (!rd)
196                 return;
197
198         urb = usb_alloc_urb(0, GFP_ATOMIC);
199         if (!urb) {
200                 kfree(rd);
201                 return;
202         }
203
204         rd->rt2x00dev = rt2x00dev;
205         rd->callback = callback;
206         rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
207         rd->cr.bRequest = USB_MULTI_READ;
208         rd->cr.wValue = 0;
209         rd->cr.wIndex = cpu_to_le16(offset);
210         rd->cr.wLength = cpu_to_le16(sizeof(u32));
211
212         usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
213                              (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
214                              rt2x00usb_register_read_async_cb, rd);
215         if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
216                 kfree(rd);
217         usb_free_urb(urb);
218 }
219 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
220
221 /*
222  * TX data handlers.
223  */
224 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
225 {
226         /*
227          * If the transfer to hardware succeeded, it does not mean the
228          * frame was send out correctly. It only means the frame
229          * was successfully pushed to the hardware, we have no
230          * way to determine the transmission status right now.
231          * (Only indirectly by looking at the failed TX counters
232          * in the register).
233          */
234         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
235                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
236         else
237                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
238 }
239
240 static void rt2x00usb_work_txdone(struct work_struct *work)
241 {
242         struct rt2x00_dev *rt2x00dev =
243             container_of(work, struct rt2x00_dev, txdone_work);
244         struct data_queue *queue;
245         struct queue_entry *entry;
246
247         tx_queue_for_each(rt2x00dev, queue) {
248                 while (!rt2x00queue_empty(queue)) {
249                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
250
251                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
252                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
253                                 break;
254
255                         rt2x00usb_work_txdone_entry(entry);
256                 }
257         }
258 }
259
260 static void rt2x00usb_interrupt_txdone(struct urb *urb)
261 {
262         struct queue_entry *entry = (struct queue_entry *)urb->context;
263         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
264
265         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
266                 return;
267
268         if (rt2x00dev->ops->lib->tx_dma_done)
269                 rt2x00dev->ops->lib->tx_dma_done(entry);
270
271         /*
272          * Report the frame as DMA done
273          */
274         rt2x00lib_dmadone(entry);
275
276         /*
277          * Check if the frame was correctly uploaded
278          */
279         if (urb->status)
280                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
281
282         /*
283          * Schedule the delayed work for reading the TX status
284          * from the device.
285          */
286         if (!test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags) ||
287             !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
288                 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
289 }
290
291 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void* data)
292 {
293         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
294         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
295         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
296         u32 length;
297         int status;
298
299         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
300             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
301                 return true;
302
303         /*
304          * USB devices cannot blindly pass the skb->len as the
305          * length of the data to usb_fill_bulk_urb. Pass the skb
306          * to the driver to determine what the length should be.
307          */
308         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
309
310         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
311                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
312                           entry->skb->data, length,
313                           rt2x00usb_interrupt_txdone, entry);
314
315         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
316         if (status) {
317                 if (status == -ENODEV)
318                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
319                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
320                 rt2x00lib_dmadone(entry);
321         }
322
323         return false;
324 }
325
326 /*
327  * RX data handlers.
328  */
329 static void rt2x00usb_work_rxdone(struct work_struct *work)
330 {
331         struct rt2x00_dev *rt2x00dev =
332             container_of(work, struct rt2x00_dev, rxdone_work);
333         struct queue_entry *entry;
334         struct skb_frame_desc *skbdesc;
335         u8 rxd[32];
336
337         while (!rt2x00queue_empty(rt2x00dev->rx)) {
338                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
339
340                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
341                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
342                         break;
343
344                 /*
345                  * Fill in desc fields of the skb descriptor
346                  */
347                 skbdesc = get_skb_frame_desc(entry->skb);
348                 skbdesc->desc = rxd;
349                 skbdesc->desc_len = entry->queue->desc_size;
350
351                 /*
352                  * Send the frame to rt2x00lib for further processing.
353                  */
354                 rt2x00lib_rxdone(entry);
355         }
356 }
357
358 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
359 {
360         struct queue_entry *entry = (struct queue_entry *)urb->context;
361         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
362
363         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
364                 return;
365
366         /*
367          * Report the frame as DMA done
368          */
369         rt2x00lib_dmadone(entry);
370
371         /*
372          * Check if the received data is simply too small
373          * to be actually valid, or if the urb is signaling
374          * a problem.
375          */
376         if (urb->actual_length < entry->queue->desc_size || urb->status)
377                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
378
379         /*
380          * Schedule the delayed work for reading the RX status
381          * from the device.
382          */
383         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
384 }
385
386 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void* data)
387 {
388         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
389         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
390         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
391         int status;
392
393         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
394             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
395                 return true;
396
397         rt2x00lib_dmastart(entry);
398
399         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
400                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
401                           entry->skb->data, entry->skb->len,
402                           rt2x00usb_interrupt_rxdone, entry);
403
404         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
405         if (status) {
406                 if (status == -ENODEV)
407                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
408                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
409                 rt2x00lib_dmadone(entry);
410         }
411
412         return false;
413 }
414
415 void rt2x00usb_kick_queue(struct data_queue *queue)
416 {
417         switch (queue->qid) {
418         case QID_AC_VO:
419         case QID_AC_VI:
420         case QID_AC_BE:
421         case QID_AC_BK:
422                 if (!rt2x00queue_empty(queue))
423                         rt2x00queue_for_each_entry(queue,
424                                                    Q_INDEX_DONE,
425                                                    Q_INDEX,
426                                                    NULL,
427                                                    rt2x00usb_kick_tx_entry);
428                 break;
429         case QID_RX:
430                 if (!rt2x00queue_full(queue))
431                         rt2x00queue_for_each_entry(queue,
432                                                    Q_INDEX_DONE,
433                                                    Q_INDEX,
434                                                    NULL,
435                                                    rt2x00usb_kick_rx_entry);
436                 break;
437         default:
438                 break;
439         }
440 }
441 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
442
443 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void* data)
444 {
445         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
446         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
447         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
448
449         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
450                 return true;
451
452         usb_kill_urb(entry_priv->urb);
453
454         /*
455          * Kill guardian urb (if required by driver).
456          */
457         if ((entry->queue->qid == QID_BEACON) &&
458             (test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags)))
459                 usb_kill_urb(bcn_priv->guardian_urb);
460
461         return false;
462 }
463
464 void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
465 {
466         struct work_struct *completion;
467         unsigned int i;
468
469         if (drop)
470                 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
471                                            rt2x00usb_flush_entry);
472
473         /*
474          * Obtain the queue completion handler
475          */
476         switch (queue->qid) {
477         case QID_AC_VO:
478         case QID_AC_VI:
479         case QID_AC_BE:
480         case QID_AC_BK:
481                 completion = &queue->rt2x00dev->txdone_work;
482                 break;
483         case QID_RX:
484                 completion = &queue->rt2x00dev->rxdone_work;
485                 break;
486         default:
487                 return;
488         }
489
490         for (i = 0; i < 10; i++) {
491                 /*
492                  * Check if the driver is already done, otherwise we
493                  * have to sleep a little while to give the driver/hw
494                  * the oppurtunity to complete interrupt process itself.
495                  */
496                 if (rt2x00queue_empty(queue))
497                         break;
498
499                 /*
500                  * Schedule the completion handler manually, when this
501                  * worker function runs, it should cleanup the queue.
502                  */
503                 queue_work(queue->rt2x00dev->workqueue, completion);
504
505                 /*
506                  * Wait for a little while to give the driver
507                  * the oppurtunity to recover itself.
508                  */
509                 msleep(10);
510         }
511 }
512 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
513
514 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
515 {
516         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
517                 " invoke forced forced reset\n", queue->qid);
518
519         rt2x00queue_flush_queue(queue, true);
520 }
521
522 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
523 {
524         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
525                 " invoke forced tx handler\n", queue->qid);
526
527         queue_work(queue->rt2x00dev->workqueue, &queue->rt2x00dev->txdone_work);
528 }
529
530 static int rt2x00usb_status_timeout(struct data_queue *queue)
531 {
532         struct queue_entry *entry;
533
534         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
535         return rt2x00queue_status_timeout(entry);
536 }
537
538 static int rt2x00usb_dma_timeout(struct data_queue *queue)
539 {
540         struct queue_entry *entry;
541
542         entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
543         return rt2x00queue_dma_timeout(entry);
544 }
545
546 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
547 {
548         struct data_queue *queue;
549
550         tx_queue_for_each(rt2x00dev, queue) {
551                 if (!rt2x00queue_empty(queue)) {
552                         if (rt2x00usb_dma_timeout(queue))
553                                 rt2x00usb_watchdog_tx_dma(queue);
554                         if (rt2x00usb_status_timeout(queue))
555                                 rt2x00usb_watchdog_tx_status(queue);
556                 }
557         }
558 }
559 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
560
561 /*
562  * Radio handlers
563  */
564 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
565 {
566         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
567                                     REGISTER_TIMEOUT);
568 }
569 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
570
571 /*
572  * Device initialization handlers.
573  */
574 void rt2x00usb_clear_entry(struct queue_entry *entry)
575 {
576         entry->flags = 0;
577
578         if (entry->queue->qid == QID_RX)
579                 rt2x00usb_kick_rx_entry(entry, NULL);
580 }
581 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
582
583 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
584                                       struct usb_endpoint_descriptor *ep_desc)
585 {
586         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
587         int pipe;
588
589         queue->usb_endpoint = usb_endpoint_num(ep_desc);
590
591         if (queue->qid == QID_RX) {
592                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
593                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
594         } else {
595                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
596                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
597         }
598
599         if (!queue->usb_maxpacket)
600                 queue->usb_maxpacket = 1;
601 }
602
603 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
604 {
605         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
606         struct usb_host_interface *intf_desc = intf->cur_altsetting;
607         struct usb_endpoint_descriptor *ep_desc;
608         struct data_queue *queue = rt2x00dev->tx;
609         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
610         unsigned int i;
611
612         /*
613          * Walk through all available endpoints to search for "bulk in"
614          * and "bulk out" endpoints. When we find such endpoints collect
615          * the information we need from the descriptor and assign it
616          * to the queue.
617          */
618         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
619                 ep_desc = &intf_desc->endpoint[i].desc;
620
621                 if (usb_endpoint_is_bulk_in(ep_desc)) {
622                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
623                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
624                            (queue != queue_end(rt2x00dev))) {
625                         rt2x00usb_assign_endpoint(queue, ep_desc);
626                         queue = queue_next(queue);
627
628                         tx_ep_desc = ep_desc;
629                 }
630         }
631
632         /*
633          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
634          */
635         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
636                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
637                 return -EPIPE;
638         }
639
640         /*
641          * It might be possible not all queues have a dedicated endpoint.
642          * Loop through all TX queues and copy the endpoint information
643          * which we have gathered from already assigned endpoints.
644          */
645         txall_queue_for_each(rt2x00dev, queue) {
646                 if (!queue->usb_endpoint)
647                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
648         }
649
650         return 0;
651 }
652
653 static int rt2x00usb_alloc_entries(struct data_queue *queue)
654 {
655         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
656         struct queue_entry_priv_usb *entry_priv;
657         struct queue_entry_priv_usb_bcn *bcn_priv;
658         unsigned int i;
659
660         for (i = 0; i < queue->limit; i++) {
661                 entry_priv = queue->entries[i].priv_data;
662                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
663                 if (!entry_priv->urb)
664                         return -ENOMEM;
665         }
666
667         /*
668          * If this is not the beacon queue or
669          * no guardian byte was required for the beacon,
670          * then we are done.
671          */
672         if (queue->qid != QID_BEACON ||
673             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
674                 return 0;
675
676         for (i = 0; i < queue->limit; i++) {
677                 bcn_priv = queue->entries[i].priv_data;
678                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
679                 if (!bcn_priv->guardian_urb)
680                         return -ENOMEM;
681         }
682
683         return 0;
684 }
685
686 static void rt2x00usb_free_entries(struct data_queue *queue)
687 {
688         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
689         struct queue_entry_priv_usb *entry_priv;
690         struct queue_entry_priv_usb_bcn *bcn_priv;
691         unsigned int i;
692
693         if (!queue->entries)
694                 return;
695
696         for (i = 0; i < queue->limit; i++) {
697                 entry_priv = queue->entries[i].priv_data;
698                 usb_kill_urb(entry_priv->urb);
699                 usb_free_urb(entry_priv->urb);
700         }
701
702         /*
703          * If this is not the beacon queue or
704          * no guardian byte was required for the beacon,
705          * then we are done.
706          */
707         if (queue->qid != QID_BEACON ||
708             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
709                 return;
710
711         for (i = 0; i < queue->limit; i++) {
712                 bcn_priv = queue->entries[i].priv_data;
713                 usb_kill_urb(bcn_priv->guardian_urb);
714                 usb_free_urb(bcn_priv->guardian_urb);
715         }
716 }
717
718 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
719 {
720         struct data_queue *queue;
721         int status;
722
723         /*
724          * Find endpoints for each queue
725          */
726         status = rt2x00usb_find_endpoints(rt2x00dev);
727         if (status)
728                 goto exit;
729
730         /*
731          * Allocate DMA
732          */
733         queue_for_each(rt2x00dev, queue) {
734                 status = rt2x00usb_alloc_entries(queue);
735                 if (status)
736                         goto exit;
737         }
738
739         return 0;
740
741 exit:
742         rt2x00usb_uninitialize(rt2x00dev);
743
744         return status;
745 }
746 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
747
748 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
749 {
750         struct data_queue *queue;
751
752         queue_for_each(rt2x00dev, queue)
753                 rt2x00usb_free_entries(queue);
754 }
755 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
756
757 /*
758  * USB driver handlers.
759  */
760 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
761 {
762         kfree(rt2x00dev->rf);
763         rt2x00dev->rf = NULL;
764
765         kfree(rt2x00dev->eeprom);
766         rt2x00dev->eeprom = NULL;
767
768         kfree(rt2x00dev->csr.cache);
769         rt2x00dev->csr.cache = NULL;
770 }
771
772 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
773 {
774         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
775         if (!rt2x00dev->csr.cache)
776                 goto exit;
777
778         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
779         if (!rt2x00dev->eeprom)
780                 goto exit;
781
782         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
783         if (!rt2x00dev->rf)
784                 goto exit;
785
786         return 0;
787
788 exit:
789         ERROR_PROBE("Failed to allocate registers.\n");
790
791         rt2x00usb_free_reg(rt2x00dev);
792
793         return -ENOMEM;
794 }
795
796 int rt2x00usb_probe(struct usb_interface *usb_intf,
797                     const struct rt2x00_ops *ops)
798 {
799         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
800         struct ieee80211_hw *hw;
801         struct rt2x00_dev *rt2x00dev;
802         int retval;
803
804         usb_dev = usb_get_dev(usb_dev);
805
806         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
807         if (!hw) {
808                 ERROR_PROBE("Failed to allocate hardware.\n");
809                 retval = -ENOMEM;
810                 goto exit_put_device;
811         }
812
813         usb_set_intfdata(usb_intf, hw);
814
815         rt2x00dev = hw->priv;
816         rt2x00dev->dev = &usb_intf->dev;
817         rt2x00dev->ops = ops;
818         rt2x00dev->hw = hw;
819
820         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
821
822         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
823         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
824         init_timer(&rt2x00dev->txstatus_timer);
825
826         retval = rt2x00usb_alloc_reg(rt2x00dev);
827         if (retval)
828                 goto exit_free_device;
829
830         retval = rt2x00lib_probe_dev(rt2x00dev);
831         if (retval)
832                 goto exit_free_reg;
833
834         return 0;
835
836 exit_free_reg:
837         rt2x00usb_free_reg(rt2x00dev);
838
839 exit_free_device:
840         ieee80211_free_hw(hw);
841
842 exit_put_device:
843         usb_put_dev(usb_dev);
844
845         usb_set_intfdata(usb_intf, NULL);
846
847         return retval;
848 }
849 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
850
851 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
852 {
853         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
854         struct rt2x00_dev *rt2x00dev = hw->priv;
855
856         /*
857          * Free all allocated data.
858          */
859         rt2x00lib_remove_dev(rt2x00dev);
860         rt2x00usb_free_reg(rt2x00dev);
861         ieee80211_free_hw(hw);
862
863         /*
864          * Free the USB device data.
865          */
866         usb_set_intfdata(usb_intf, NULL);
867         usb_put_dev(interface_to_usbdev(usb_intf));
868 }
869 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
870
871 #ifdef CONFIG_PM
872 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
873 {
874         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
875         struct rt2x00_dev *rt2x00dev = hw->priv;
876         int retval;
877
878         retval = rt2x00lib_suspend(rt2x00dev, state);
879         if (retval)
880                 return retval;
881
882         /*
883          * Decrease usbdev refcount.
884          */
885         usb_put_dev(interface_to_usbdev(usb_intf));
886
887         return 0;
888 }
889 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
890
891 int rt2x00usb_resume(struct usb_interface *usb_intf)
892 {
893         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
894         struct rt2x00_dev *rt2x00dev = hw->priv;
895
896         usb_get_dev(interface_to_usbdev(usb_intf));
897
898         return rt2x00lib_resume(rt2x00dev);
899 }
900 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
901 #endif /* CONFIG_PM */
902
903 /*
904  * rt2x00usb module information.
905  */
906 MODULE_AUTHOR(DRV_PROJECT);
907 MODULE_VERSION(DRV_VERSION);
908 MODULE_DESCRIPTION("rt2x00 usb library");
909 MODULE_LICENSE("GPL");