14736e217947fa39a1ba88da3da9ef02d600f658
[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         void (*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         rd->callback(rd->rt2x00dev, urb->status, le32_to_cpu(rd->reg));
180         kfree(urb->context);
181 }
182
183 void rt2x00usb_register_read_async(struct rt2x00_dev *rt2x00dev,
184                                    const unsigned int offset,
185                                    void (*callback)(struct rt2x00_dev*,int,u32))
186 {
187         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
188         struct urb *urb;
189         struct rt2x00_async_read_data *rd;
190
191         rd = kmalloc(sizeof(*rd), GFP_ATOMIC);
192         if (!rd)
193                 return;
194
195         urb = usb_alloc_urb(0, GFP_ATOMIC);
196         if (!urb) {
197                 kfree(rd);
198                 return;
199         }
200
201         rd->rt2x00dev = rt2x00dev;
202         rd->callback = callback;
203         rd->cr.bRequestType = USB_VENDOR_REQUEST_IN;
204         rd->cr.bRequest = USB_MULTI_READ;
205         rd->cr.wValue = 0;
206         rd->cr.wIndex = cpu_to_le16(offset);
207         rd->cr.wLength = cpu_to_le16(sizeof(u32));
208
209         usb_fill_control_urb(urb, usb_dev, usb_rcvctrlpipe(usb_dev, 0),
210                              (unsigned char *)(&rd->cr), &rd->reg, sizeof(rd->reg),
211                              rt2x00usb_register_read_async_cb, rd);
212         if (usb_submit_urb(urb, GFP_ATOMIC) < 0)
213                 kfree(rd);
214         usb_free_urb(urb);
215 }
216 EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
217
218 /*
219  * TX data handlers.
220  */
221 static void rt2x00usb_work_txdone_entry(struct queue_entry *entry)
222 {
223         /*
224          * If the transfer to hardware succeeded, it does not mean the
225          * frame was send out correctly. It only means the frame
226          * was succesfully pushed to the hardware, we have no
227          * way to determine the transmission status right now.
228          * (Only indirectly by looking at the failed TX counters
229          * in the register).
230          */
231         if (test_bit(ENTRY_DATA_IO_FAILED, &entry->flags))
232                 rt2x00lib_txdone_noinfo(entry, TXDONE_FAILURE);
233         else
234                 rt2x00lib_txdone_noinfo(entry, TXDONE_UNKNOWN);
235 }
236
237 static void rt2x00usb_work_txdone(struct work_struct *work)
238 {
239         struct rt2x00_dev *rt2x00dev =
240             container_of(work, struct rt2x00_dev, txdone_work);
241         struct data_queue *queue;
242         struct queue_entry *entry;
243
244         tx_queue_for_each(rt2x00dev, queue) {
245                 while (!rt2x00queue_empty(queue)) {
246                         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
247
248                         if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
249                             !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
250                                 break;
251
252                         rt2x00usb_work_txdone_entry(entry);
253                 }
254         }
255 }
256
257 static void rt2x00usb_interrupt_txdone(struct urb *urb)
258 {
259         struct queue_entry *entry = (struct queue_entry *)urb->context;
260         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
261
262         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
263                 return;
264
265         if (rt2x00dev->ops->lib->tx_dma_done)
266                 rt2x00dev->ops->lib->tx_dma_done(entry);
267
268         /*
269          * Report the frame as DMA done
270          */
271         rt2x00lib_dmadone(entry);
272
273         /*
274          * Check if the frame was correctly uploaded
275          */
276         if (urb->status)
277                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
278
279         /*
280          * Schedule the delayed work for reading the TX status
281          * from the device.
282          */
283         queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
284 }
285
286 static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void* data)
287 {
288         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
289         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
290         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
291         u32 length;
292         int status;
293
294         if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
295             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
296                 return true;
297
298         /*
299          * USB devices cannot blindly pass the skb->len as the
300          * length of the data to usb_fill_bulk_urb. Pass the skb
301          * to the driver to determine what the length should be.
302          */
303         length = rt2x00dev->ops->lib->get_tx_data_len(entry);
304
305         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
306                           usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
307                           entry->skb->data, length,
308                           rt2x00usb_interrupt_txdone, entry);
309
310         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
311         if (status) {
312                 if (status == -ENODEV)
313                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
314                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
315                 rt2x00lib_dmadone(entry);
316         }
317
318         return false;
319 }
320
321 /*
322  * RX data handlers.
323  */
324 static void rt2x00usb_work_rxdone(struct work_struct *work)
325 {
326         struct rt2x00_dev *rt2x00dev =
327             container_of(work, struct rt2x00_dev, rxdone_work);
328         struct queue_entry *entry;
329         struct skb_frame_desc *skbdesc;
330         u8 rxd[32];
331
332         while (!rt2x00queue_empty(rt2x00dev->rx)) {
333                 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
334
335                 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
336                     !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
337                         break;
338
339                 /*
340                  * Fill in desc fields of the skb descriptor
341                  */
342                 skbdesc = get_skb_frame_desc(entry->skb);
343                 skbdesc->desc = rxd;
344                 skbdesc->desc_len = entry->queue->desc_size;
345
346                 /*
347                  * Send the frame to rt2x00lib for further processing.
348                  */
349                 rt2x00lib_rxdone(entry);
350         }
351 }
352
353 static void rt2x00usb_interrupt_rxdone(struct urb *urb)
354 {
355         struct queue_entry *entry = (struct queue_entry *)urb->context;
356         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
357
358         if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
359                 return;
360
361         /*
362          * Report the frame as DMA done
363          */
364         rt2x00lib_dmadone(entry);
365
366         /*
367          * Check if the received data is simply too small
368          * to be actually valid, or if the urb is signaling
369          * a problem.
370          */
371         if (urb->actual_length < entry->queue->desc_size || urb->status)
372                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
373
374         /*
375          * Schedule the delayed work for reading the RX status
376          * from the device.
377          */
378         queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
379 }
380
381 static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void* data)
382 {
383         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
384         struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
385         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
386         int status;
387
388         if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
389             test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
390                 return true;
391
392         rt2x00lib_dmastart(entry);
393
394         usb_fill_bulk_urb(entry_priv->urb, usb_dev,
395                           usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
396                           entry->skb->data, entry->skb->len,
397                           rt2x00usb_interrupt_rxdone, entry);
398
399         status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
400         if (status) {
401                 if (status == -ENODEV)
402                         clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
403                 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
404                 rt2x00lib_dmadone(entry);
405         }
406
407         return false;
408 }
409
410 void rt2x00usb_kick_queue(struct data_queue *queue)
411 {
412         switch (queue->qid) {
413         case QID_AC_VO:
414         case QID_AC_VI:
415         case QID_AC_BE:
416         case QID_AC_BK:
417                 if (!rt2x00queue_empty(queue))
418                         rt2x00queue_for_each_entry(queue,
419                                                    Q_INDEX_DONE,
420                                                    Q_INDEX,
421                                                    NULL,
422                                                    rt2x00usb_kick_tx_entry);
423                 break;
424         case QID_RX:
425                 if (!rt2x00queue_full(queue))
426                         rt2x00queue_for_each_entry(queue,
427                                                    Q_INDEX_DONE,
428                                                    Q_INDEX,
429                                                    NULL,
430                                                    rt2x00usb_kick_rx_entry);
431                 break;
432         default:
433                 break;
434         }
435 }
436 EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
437
438 static bool rt2x00usb_flush_entry(struct queue_entry *entry, void* data)
439 {
440         struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
441         struct queue_entry_priv_usb *entry_priv = entry->priv_data;
442         struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
443
444         if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
445                 return true;
446
447         usb_kill_urb(entry_priv->urb);
448
449         /*
450          * Kill guardian urb (if required by driver).
451          */
452         if ((entry->queue->qid == QID_BEACON) &&
453             (test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags)))
454                 usb_kill_urb(bcn_priv->guardian_urb);
455
456         return false;
457 }
458
459 void rt2x00usb_flush_queue(struct data_queue *queue)
460 {
461         struct work_struct *completion;
462         unsigned int i;
463
464         rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
465                                    rt2x00usb_flush_entry);
466
467         /*
468          * Obtain the queue completion handler
469          */
470         switch (queue->qid) {
471         case QID_AC_VO:
472         case QID_AC_VI:
473         case QID_AC_BE:
474         case QID_AC_BK:
475                 completion = &queue->rt2x00dev->txdone_work;
476                 break;
477         case QID_RX:
478                 completion = &queue->rt2x00dev->rxdone_work;
479                 break;
480         default:
481                 return;
482         }
483
484         for (i = 0; i < 20; i++) {
485                 /*
486                  * Check if the driver is already done, otherwise we
487                  * have to sleep a little while to give the driver/hw
488                  * the oppurtunity to complete interrupt process itself.
489                  */
490                 if (rt2x00queue_empty(queue))
491                         break;
492
493                 /*
494                  * Schedule the completion handler manually, when this
495                  * worker function runs, it should cleanup the queue.
496                  */
497                 queue_work(queue->rt2x00dev->workqueue, completion);
498
499                 /*
500                  * Wait for a little while to give the driver
501                  * the oppurtunity to recover itself.
502                  */
503                 msleep(10);
504         }
505 }
506 EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
507
508 static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
509 {
510         WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
511                 " invoke forced forced reset\n", queue->qid);
512
513         rt2x00queue_flush_queue(queue, true);
514 }
515
516 static void rt2x00usb_watchdog_tx_status(struct data_queue *queue)
517 {
518         WARNING(queue->rt2x00dev, "TX queue %d status timed out,"
519                 " invoke forced tx handler\n", queue->qid);
520
521         queue_work(queue->rt2x00dev->workqueue, &queue->rt2x00dev->txdone_work);
522 }
523
524 static int rt2x00usb_status_timeout(struct data_queue *queue)
525 {
526         struct queue_entry *entry;
527
528         entry = rt2x00queue_get_entry(queue, Q_INDEX_DONE);
529         return rt2x00queue_status_timeout(entry);
530 }
531
532 static int rt2x00usb_dma_timeout(struct data_queue *queue)
533 {
534         struct queue_entry *entry;
535
536         entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
537         return rt2x00queue_dma_timeout(entry);
538 }
539
540 void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
541 {
542         struct data_queue *queue;
543
544         tx_queue_for_each(rt2x00dev, queue) {
545                 if (!rt2x00queue_empty(queue)) {
546                         if (rt2x00usb_dma_timeout(queue))
547                                 rt2x00usb_watchdog_tx_dma(queue);
548                         if (rt2x00usb_status_timeout(queue))
549                                 rt2x00usb_watchdog_tx_status(queue);
550                 }
551         }
552 }
553 EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
554
555 /*
556  * Radio handlers
557  */
558 void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
559 {
560         rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
561                                     REGISTER_TIMEOUT);
562 }
563 EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
564
565 /*
566  * Device initialization handlers.
567  */
568 void rt2x00usb_clear_entry(struct queue_entry *entry)
569 {
570         entry->flags = 0;
571
572         if (entry->queue->qid == QID_RX)
573                 rt2x00usb_kick_rx_entry(entry, NULL);
574 }
575 EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
576
577 static void rt2x00usb_assign_endpoint(struct data_queue *queue,
578                                       struct usb_endpoint_descriptor *ep_desc)
579 {
580         struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
581         int pipe;
582
583         queue->usb_endpoint = usb_endpoint_num(ep_desc);
584
585         if (queue->qid == QID_RX) {
586                 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
587                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
588         } else {
589                 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
590                 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
591         }
592
593         if (!queue->usb_maxpacket)
594                 queue->usb_maxpacket = 1;
595 }
596
597 static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
598 {
599         struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
600         struct usb_host_interface *intf_desc = intf->cur_altsetting;
601         struct usb_endpoint_descriptor *ep_desc;
602         struct data_queue *queue = rt2x00dev->tx;
603         struct usb_endpoint_descriptor *tx_ep_desc = NULL;
604         unsigned int i;
605
606         /*
607          * Walk through all available endpoints to search for "bulk in"
608          * and "bulk out" endpoints. When we find such endpoints collect
609          * the information we need from the descriptor and assign it
610          * to the queue.
611          */
612         for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
613                 ep_desc = &intf_desc->endpoint[i].desc;
614
615                 if (usb_endpoint_is_bulk_in(ep_desc)) {
616                         rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
617                 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
618                            (queue != queue_end(rt2x00dev))) {
619                         rt2x00usb_assign_endpoint(queue, ep_desc);
620                         queue = queue_next(queue);
621
622                         tx_ep_desc = ep_desc;
623                 }
624         }
625
626         /*
627          * At least 1 endpoint for RX and 1 endpoint for TX must be available.
628          */
629         if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
630                 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
631                 return -EPIPE;
632         }
633
634         /*
635          * It might be possible not all queues have a dedicated endpoint.
636          * Loop through all TX queues and copy the endpoint information
637          * which we have gathered from already assigned endpoints.
638          */
639         txall_queue_for_each(rt2x00dev, queue) {
640                 if (!queue->usb_endpoint)
641                         rt2x00usb_assign_endpoint(queue, tx_ep_desc);
642         }
643
644         return 0;
645 }
646
647 static int rt2x00usb_alloc_entries(struct data_queue *queue)
648 {
649         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
650         struct queue_entry_priv_usb *entry_priv;
651         struct queue_entry_priv_usb_bcn *bcn_priv;
652         unsigned int i;
653
654         for (i = 0; i < queue->limit; i++) {
655                 entry_priv = queue->entries[i].priv_data;
656                 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
657                 if (!entry_priv->urb)
658                         return -ENOMEM;
659         }
660
661         /*
662          * If this is not the beacon queue or
663          * no guardian byte was required for the beacon,
664          * then we are done.
665          */
666         if (queue->qid != QID_BEACON ||
667             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
668                 return 0;
669
670         for (i = 0; i < queue->limit; i++) {
671                 bcn_priv = queue->entries[i].priv_data;
672                 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
673                 if (!bcn_priv->guardian_urb)
674                         return -ENOMEM;
675         }
676
677         return 0;
678 }
679
680 static void rt2x00usb_free_entries(struct data_queue *queue)
681 {
682         struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
683         struct queue_entry_priv_usb *entry_priv;
684         struct queue_entry_priv_usb_bcn *bcn_priv;
685         unsigned int i;
686
687         if (!queue->entries)
688                 return;
689
690         for (i = 0; i < queue->limit; i++) {
691                 entry_priv = queue->entries[i].priv_data;
692                 usb_kill_urb(entry_priv->urb);
693                 usb_free_urb(entry_priv->urb);
694         }
695
696         /*
697          * If this is not the beacon queue or
698          * no guardian byte was required for the beacon,
699          * then we are done.
700          */
701         if (queue->qid != QID_BEACON ||
702             !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
703                 return;
704
705         for (i = 0; i < queue->limit; i++) {
706                 bcn_priv = queue->entries[i].priv_data;
707                 usb_kill_urb(bcn_priv->guardian_urb);
708                 usb_free_urb(bcn_priv->guardian_urb);
709         }
710 }
711
712 int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
713 {
714         struct data_queue *queue;
715         int status;
716
717         /*
718          * Find endpoints for each queue
719          */
720         status = rt2x00usb_find_endpoints(rt2x00dev);
721         if (status)
722                 goto exit;
723
724         /*
725          * Allocate DMA
726          */
727         queue_for_each(rt2x00dev, queue) {
728                 status = rt2x00usb_alloc_entries(queue);
729                 if (status)
730                         goto exit;
731         }
732
733         return 0;
734
735 exit:
736         rt2x00usb_uninitialize(rt2x00dev);
737
738         return status;
739 }
740 EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
741
742 void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
743 {
744         struct data_queue *queue;
745
746         queue_for_each(rt2x00dev, queue)
747                 rt2x00usb_free_entries(queue);
748 }
749 EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
750
751 /*
752  * USB driver handlers.
753  */
754 static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
755 {
756         kfree(rt2x00dev->rf);
757         rt2x00dev->rf = NULL;
758
759         kfree(rt2x00dev->eeprom);
760         rt2x00dev->eeprom = NULL;
761
762         kfree(rt2x00dev->csr.cache);
763         rt2x00dev->csr.cache = NULL;
764 }
765
766 static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
767 {
768         rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
769         if (!rt2x00dev->csr.cache)
770                 goto exit;
771
772         rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
773         if (!rt2x00dev->eeprom)
774                 goto exit;
775
776         rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
777         if (!rt2x00dev->rf)
778                 goto exit;
779
780         return 0;
781
782 exit:
783         ERROR_PROBE("Failed to allocate registers.\n");
784
785         rt2x00usb_free_reg(rt2x00dev);
786
787         return -ENOMEM;
788 }
789
790 int rt2x00usb_probe(struct usb_interface *usb_intf,
791                     const struct usb_device_id *id)
792 {
793         struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
794         struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
795         struct ieee80211_hw *hw;
796         struct rt2x00_dev *rt2x00dev;
797         int retval;
798
799         usb_dev = usb_get_dev(usb_dev);
800
801         hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
802         if (!hw) {
803                 ERROR_PROBE("Failed to allocate hardware.\n");
804                 retval = -ENOMEM;
805                 goto exit_put_device;
806         }
807
808         usb_set_intfdata(usb_intf, hw);
809
810         rt2x00dev = hw->priv;
811         rt2x00dev->dev = &usb_intf->dev;
812         rt2x00dev->ops = ops;
813         rt2x00dev->hw = hw;
814
815         rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
816
817         INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
818         INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
819
820         retval = rt2x00usb_alloc_reg(rt2x00dev);
821         if (retval)
822                 goto exit_free_device;
823
824         retval = rt2x00lib_probe_dev(rt2x00dev);
825         if (retval)
826                 goto exit_free_reg;
827
828         return 0;
829
830 exit_free_reg:
831         rt2x00usb_free_reg(rt2x00dev);
832
833 exit_free_device:
834         ieee80211_free_hw(hw);
835
836 exit_put_device:
837         usb_put_dev(usb_dev);
838
839         usb_set_intfdata(usb_intf, NULL);
840
841         return retval;
842 }
843 EXPORT_SYMBOL_GPL(rt2x00usb_probe);
844
845 void rt2x00usb_disconnect(struct usb_interface *usb_intf)
846 {
847         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
848         struct rt2x00_dev *rt2x00dev = hw->priv;
849
850         /*
851          * Free all allocated data.
852          */
853         rt2x00lib_remove_dev(rt2x00dev);
854         rt2x00usb_free_reg(rt2x00dev);
855         ieee80211_free_hw(hw);
856
857         /*
858          * Free the USB device data.
859          */
860         usb_set_intfdata(usb_intf, NULL);
861         usb_put_dev(interface_to_usbdev(usb_intf));
862 }
863 EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
864
865 #ifdef CONFIG_PM
866 int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
867 {
868         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
869         struct rt2x00_dev *rt2x00dev = hw->priv;
870         int retval;
871
872         retval = rt2x00lib_suspend(rt2x00dev, state);
873         if (retval)
874                 return retval;
875
876         /*
877          * Decrease usbdev refcount.
878          */
879         usb_put_dev(interface_to_usbdev(usb_intf));
880
881         return 0;
882 }
883 EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
884
885 int rt2x00usb_resume(struct usb_interface *usb_intf)
886 {
887         struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
888         struct rt2x00_dev *rt2x00dev = hw->priv;
889
890         usb_get_dev(interface_to_usbdev(usb_intf));
891
892         return rt2x00lib_resume(rt2x00dev);
893 }
894 EXPORT_SYMBOL_GPL(rt2x00usb_resume);
895 #endif /* CONFIG_PM */
896
897 /*
898  * rt2x00usb module information.
899  */
900 MODULE_AUTHOR(DRV_PROJECT);
901 MODULE_VERSION(DRV_VERSION);
902 MODULE_DESCRIPTION("rt2x00 usb library");
903 MODULE_LICENSE("GPL");