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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 */
39int 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}
79EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
80
81int 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}
110EXPORT_SYMBOL_GPL(rt2x00usb_vendor_req_buff_lock);
111
112int 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}
141EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
142
143int 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}
166EXPORT_SYMBOL_GPL(rt2x00usb_regbusy_read);
167
168
169struct 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
176static 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
186void 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}
219EXPORT_SYMBOL_GPL(rt2x00usb_register_read_async);
220
221/*
222 * TX data handlers.
223 */
224static 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
240static 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
260static 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_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
266 return;
267 /*
268 * Check if the frame was correctly uploaded
269 */
270 if (urb->status)
271 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
272 /*
273 * Report the frame as DMA done
274 */
275 rt2x00lib_dmadone(entry);
276
277 if (rt2x00dev->ops->lib->tx_dma_done)
278 rt2x00dev->ops->lib->tx_dma_done(entry);
279 /*
280 * Schedule the delayed work for reading the TX status
281 * from the device.
282 */
283 if (!test_bit(REQUIRE_TXSTATUS_FIFO, &rt2x00dev->cap_flags) ||
284 !kfifo_is_empty(&rt2x00dev->txstatus_fifo))
285 queue_work(rt2x00dev->workqueue, &rt2x00dev->txdone_work);
286}
287
288static bool rt2x00usb_kick_tx_entry(struct queue_entry *entry, void* data)
289{
290 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
291 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
292 struct queue_entry_priv_usb *entry_priv = entry->priv_data;
293 u32 length;
294 int status;
295
296 if (!test_and_clear_bit(ENTRY_DATA_PENDING, &entry->flags) ||
297 test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
298 return false;
299
300 /*
301 * USB devices require certain padding at the end of each frame
302 * and urb. Those paddings are not included in skbs. Pass entry
303 * to the driver to determine what the overall length should be.
304 */
305 length = rt2x00dev->ops->lib->get_tx_data_len(entry);
306
307 status = skb_padto(entry->skb, length);
308 if (unlikely(status)) {
309 /* TODO: report something more appropriate than IO_FAILED. */
310 WARNING(rt2x00dev, "TX SKB padding error, out of memory\n");
311 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
312 rt2x00lib_dmadone(entry);
313
314 return false;
315 }
316
317 usb_fill_bulk_urb(entry_priv->urb, usb_dev,
318 usb_sndbulkpipe(usb_dev, entry->queue->usb_endpoint),
319 entry->skb->data, length,
320 rt2x00usb_interrupt_txdone, entry);
321
322 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
323 if (status) {
324 if (status == -ENODEV)
325 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
326 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
327 rt2x00lib_dmadone(entry);
328 }
329
330 return false;
331}
332
333/*
334 * RX data handlers.
335 */
336static void rt2x00usb_work_rxdone(struct work_struct *work)
337{
338 struct rt2x00_dev *rt2x00dev =
339 container_of(work, struct rt2x00_dev, rxdone_work);
340 struct queue_entry *entry;
341 struct skb_frame_desc *skbdesc;
342 u8 rxd[32];
343
344 while (!rt2x00queue_empty(rt2x00dev->rx)) {
345 entry = rt2x00queue_get_entry(rt2x00dev->rx, Q_INDEX_DONE);
346
347 if (test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
348 !test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
349 break;
350
351 /*
352 * Fill in desc fields of the skb descriptor
353 */
354 skbdesc = get_skb_frame_desc(entry->skb);
355 skbdesc->desc = rxd;
356 skbdesc->desc_len = entry->queue->desc_size;
357
358 /*
359 * Send the frame to rt2x00lib for further processing.
360 */
361 rt2x00lib_rxdone(entry, GFP_KERNEL);
362 }
363}
364
365static void rt2x00usb_interrupt_rxdone(struct urb *urb)
366{
367 struct queue_entry *entry = (struct queue_entry *)urb->context;
368 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
369
370 if (!test_and_clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
371 return;
372
373 /*
374 * Report the frame as DMA done
375 */
376 rt2x00lib_dmadone(entry);
377
378 /*
379 * Check if the received data is simply too small
380 * to be actually valid, or if the urb is signaling
381 * a problem.
382 */
383 if (urb->actual_length < entry->queue->desc_size || urb->status)
384 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
385
386 /*
387 * Schedule the delayed work for reading the RX status
388 * from the device.
389 */
390 queue_work(rt2x00dev->workqueue, &rt2x00dev->rxdone_work);
391}
392
393static bool rt2x00usb_kick_rx_entry(struct queue_entry *entry, void* data)
394{
395 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
396 struct usb_device *usb_dev = to_usb_device_intf(rt2x00dev->dev);
397 struct queue_entry_priv_usb *entry_priv = entry->priv_data;
398 int status;
399
400 if (test_and_set_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags) ||
401 test_bit(ENTRY_DATA_STATUS_PENDING, &entry->flags))
402 return false;
403
404 rt2x00lib_dmastart(entry);
405
406 usb_fill_bulk_urb(entry_priv->urb, usb_dev,
407 usb_rcvbulkpipe(usb_dev, entry->queue->usb_endpoint),
408 entry->skb->data, entry->skb->len,
409 rt2x00usb_interrupt_rxdone, entry);
410
411 status = usb_submit_urb(entry_priv->urb, GFP_ATOMIC);
412 if (status) {
413 if (status == -ENODEV)
414 clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);
415 set_bit(ENTRY_DATA_IO_FAILED, &entry->flags);
416 rt2x00lib_dmadone(entry);
417 }
418
419 return false;
420}
421
422void rt2x00usb_kick_queue(struct data_queue *queue)
423{
424 switch (queue->qid) {
425 case QID_AC_VO:
426 case QID_AC_VI:
427 case QID_AC_BE:
428 case QID_AC_BK:
429 if (!rt2x00queue_empty(queue))
430 rt2x00queue_for_each_entry(queue,
431 Q_INDEX_DONE,
432 Q_INDEX,
433 NULL,
434 rt2x00usb_kick_tx_entry);
435 break;
436 case QID_RX:
437 if (!rt2x00queue_full(queue))
438 rt2x00queue_for_each_entry(queue,
439 Q_INDEX,
440 Q_INDEX_DONE,
441 NULL,
442 rt2x00usb_kick_rx_entry);
443 break;
444 default:
445 break;
446 }
447}
448EXPORT_SYMBOL_GPL(rt2x00usb_kick_queue);
449
450static bool rt2x00usb_flush_entry(struct queue_entry *entry, void* data)
451{
452 struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
453 struct queue_entry_priv_usb *entry_priv = entry->priv_data;
454 struct queue_entry_priv_usb_bcn *bcn_priv = entry->priv_data;
455
456 if (!test_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags))
457 return false;
458
459 usb_kill_urb(entry_priv->urb);
460
461 /*
462 * Kill guardian urb (if required by driver).
463 */
464 if ((entry->queue->qid == QID_BEACON) &&
465 (test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags)))
466 usb_kill_urb(bcn_priv->guardian_urb);
467
468 return false;
469}
470
471void rt2x00usb_flush_queue(struct data_queue *queue, bool drop)
472{
473 struct work_struct *completion;
474 unsigned int i;
475
476 if (drop)
477 rt2x00queue_for_each_entry(queue, Q_INDEX_DONE, Q_INDEX, NULL,
478 rt2x00usb_flush_entry);
479
480 /*
481 * Obtain the queue completion handler
482 */
483 switch (queue->qid) {
484 case QID_AC_VO:
485 case QID_AC_VI:
486 case QID_AC_BE:
487 case QID_AC_BK:
488 completion = &queue->rt2x00dev->txdone_work;
489 break;
490 case QID_RX:
491 completion = &queue->rt2x00dev->rxdone_work;
492 break;
493 default:
494 return;
495 }
496
497 for (i = 0; i < 10; i++) {
498 /*
499 * Check if the driver is already done, otherwise we
500 * have to sleep a little while to give the driver/hw
501 * the oppurtunity to complete interrupt process itself.
502 */
503 if (rt2x00queue_empty(queue))
504 break;
505
506 /*
507 * Schedule the completion handler manually, when this
508 * worker function runs, it should cleanup the queue.
509 */
510 queue_work(queue->rt2x00dev->workqueue, completion);
511
512 /*
513 * Wait for a little while to give the driver
514 * the oppurtunity to recover itself.
515 */
516 msleep(10);
517 }
518}
519EXPORT_SYMBOL_GPL(rt2x00usb_flush_queue);
520
521static void rt2x00usb_watchdog_tx_dma(struct data_queue *queue)
522{
523 WARNING(queue->rt2x00dev, "TX queue %d DMA timed out,"
524 " invoke forced forced reset\n", queue->qid);
525
526 rt2x00queue_flush_queue(queue, true);
527}
528
529static int rt2x00usb_dma_timeout(struct data_queue *queue)
530{
531 struct queue_entry *entry;
532
533 entry = rt2x00queue_get_entry(queue, Q_INDEX_DMA_DONE);
534 return rt2x00queue_dma_timeout(entry);
535}
536
537void rt2x00usb_watchdog(struct rt2x00_dev *rt2x00dev)
538{
539 struct data_queue *queue;
540
541 tx_queue_for_each(rt2x00dev, queue) {
542 if (!rt2x00queue_empty(queue)) {
543 if (rt2x00usb_dma_timeout(queue))
544 rt2x00usb_watchdog_tx_dma(queue);
545 }
546 }
547}
548EXPORT_SYMBOL_GPL(rt2x00usb_watchdog);
549
550/*
551 * Radio handlers
552 */
553void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
554{
555 rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0, 0,
556 REGISTER_TIMEOUT);
557}
558EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
559
560/*
561 * Device initialization handlers.
562 */
563void rt2x00usb_clear_entry(struct queue_entry *entry)
564{
565 entry->flags = 0;
566
567 if (entry->queue->qid == QID_RX)
568 rt2x00usb_kick_rx_entry(entry, NULL);
569}
570EXPORT_SYMBOL_GPL(rt2x00usb_clear_entry);
571
572static void rt2x00usb_assign_endpoint(struct data_queue *queue,
573 struct usb_endpoint_descriptor *ep_desc)
574{
575 struct usb_device *usb_dev = to_usb_device_intf(queue->rt2x00dev->dev);
576 int pipe;
577
578 queue->usb_endpoint = usb_endpoint_num(ep_desc);
579
580 if (queue->qid == QID_RX) {
581 pipe = usb_rcvbulkpipe(usb_dev, queue->usb_endpoint);
582 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 0);
583 } else {
584 pipe = usb_sndbulkpipe(usb_dev, queue->usb_endpoint);
585 queue->usb_maxpacket = usb_maxpacket(usb_dev, pipe, 1);
586 }
587
588 if (!queue->usb_maxpacket)
589 queue->usb_maxpacket = 1;
590}
591
592static int rt2x00usb_find_endpoints(struct rt2x00_dev *rt2x00dev)
593{
594 struct usb_interface *intf = to_usb_interface(rt2x00dev->dev);
595 struct usb_host_interface *intf_desc = intf->cur_altsetting;
596 struct usb_endpoint_descriptor *ep_desc;
597 struct data_queue *queue = rt2x00dev->tx;
598 struct usb_endpoint_descriptor *tx_ep_desc = NULL;
599 unsigned int i;
600
601 /*
602 * Walk through all available endpoints to search for "bulk in"
603 * and "bulk out" endpoints. When we find such endpoints collect
604 * the information we need from the descriptor and assign it
605 * to the queue.
606 */
607 for (i = 0; i < intf_desc->desc.bNumEndpoints; i++) {
608 ep_desc = &intf_desc->endpoint[i].desc;
609
610 if (usb_endpoint_is_bulk_in(ep_desc)) {
611 rt2x00usb_assign_endpoint(rt2x00dev->rx, ep_desc);
612 } else if (usb_endpoint_is_bulk_out(ep_desc) &&
613 (queue != queue_end(rt2x00dev))) {
614 rt2x00usb_assign_endpoint(queue, ep_desc);
615 queue = queue_next(queue);
616
617 tx_ep_desc = ep_desc;
618 }
619 }
620
621 /*
622 * At least 1 endpoint for RX and 1 endpoint for TX must be available.
623 */
624 if (!rt2x00dev->rx->usb_endpoint || !rt2x00dev->tx->usb_endpoint) {
625 ERROR(rt2x00dev, "Bulk-in/Bulk-out endpoints not found\n");
626 return -EPIPE;
627 }
628
629 /*
630 * It might be possible not all queues have a dedicated endpoint.
631 * Loop through all TX queues and copy the endpoint information
632 * which we have gathered from already assigned endpoints.
633 */
634 txall_queue_for_each(rt2x00dev, queue) {
635 if (!queue->usb_endpoint)
636 rt2x00usb_assign_endpoint(queue, tx_ep_desc);
637 }
638
639 return 0;
640}
641
642static int rt2x00usb_alloc_entries(struct data_queue *queue)
643{
644 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
645 struct queue_entry_priv_usb *entry_priv;
646 struct queue_entry_priv_usb_bcn *bcn_priv;
647 unsigned int i;
648
649 for (i = 0; i < queue->limit; i++) {
650 entry_priv = queue->entries[i].priv_data;
651 entry_priv->urb = usb_alloc_urb(0, GFP_KERNEL);
652 if (!entry_priv->urb)
653 return -ENOMEM;
654 }
655
656 /*
657 * If this is not the beacon queue or
658 * no guardian byte was required for the beacon,
659 * then we are done.
660 */
661 if (queue->qid != QID_BEACON ||
662 !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
663 return 0;
664
665 for (i = 0; i < queue->limit; i++) {
666 bcn_priv = queue->entries[i].priv_data;
667 bcn_priv->guardian_urb = usb_alloc_urb(0, GFP_KERNEL);
668 if (!bcn_priv->guardian_urb)
669 return -ENOMEM;
670 }
671
672 return 0;
673}
674
675static void rt2x00usb_free_entries(struct data_queue *queue)
676{
677 struct rt2x00_dev *rt2x00dev = queue->rt2x00dev;
678 struct queue_entry_priv_usb *entry_priv;
679 struct queue_entry_priv_usb_bcn *bcn_priv;
680 unsigned int i;
681
682 if (!queue->entries)
683 return;
684
685 for (i = 0; i < queue->limit; i++) {
686 entry_priv = queue->entries[i].priv_data;
687 usb_kill_urb(entry_priv->urb);
688 usb_free_urb(entry_priv->urb);
689 }
690
691 /*
692 * If this is not the beacon queue or
693 * no guardian byte was required for the beacon,
694 * then we are done.
695 */
696 if (queue->qid != QID_BEACON ||
697 !test_bit(REQUIRE_BEACON_GUARD, &rt2x00dev->cap_flags))
698 return;
699
700 for (i = 0; i < queue->limit; i++) {
701 bcn_priv = queue->entries[i].priv_data;
702 usb_kill_urb(bcn_priv->guardian_urb);
703 usb_free_urb(bcn_priv->guardian_urb);
704 }
705}
706
707int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
708{
709 struct data_queue *queue;
710 int status;
711
712 /*
713 * Find endpoints for each queue
714 */
715 status = rt2x00usb_find_endpoints(rt2x00dev);
716 if (status)
717 goto exit;
718
719 /*
720 * Allocate DMA
721 */
722 queue_for_each(rt2x00dev, queue) {
723 status = rt2x00usb_alloc_entries(queue);
724 if (status)
725 goto exit;
726 }
727
728 return 0;
729
730exit:
731 rt2x00usb_uninitialize(rt2x00dev);
732
733 return status;
734}
735EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
736
737void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
738{
739 struct data_queue *queue;
740
741 queue_for_each(rt2x00dev, queue)
742 rt2x00usb_free_entries(queue);
743}
744EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
745
746/*
747 * USB driver handlers.
748 */
749static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
750{
751 kfree(rt2x00dev->rf);
752 rt2x00dev->rf = NULL;
753
754 kfree(rt2x00dev->eeprom);
755 rt2x00dev->eeprom = NULL;
756
757 kfree(rt2x00dev->csr.cache);
758 rt2x00dev->csr.cache = NULL;
759}
760
761static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
762{
763 rt2x00dev->csr.cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
764 if (!rt2x00dev->csr.cache)
765 goto exit;
766
767 rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
768 if (!rt2x00dev->eeprom)
769 goto exit;
770
771 rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
772 if (!rt2x00dev->rf)
773 goto exit;
774
775 return 0;
776
777exit:
778 ERROR_PROBE("Failed to allocate registers.\n");
779
780 rt2x00usb_free_reg(rt2x00dev);
781
782 return -ENOMEM;
783}
784
785int rt2x00usb_probe(struct usb_interface *usb_intf,
786 const struct rt2x00_ops *ops)
787{
788 struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
789 struct ieee80211_hw *hw;
790 struct rt2x00_dev *rt2x00dev;
791 int retval;
792
793 usb_dev = usb_get_dev(usb_dev);
794 usb_reset_device(usb_dev);
795
796 hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
797 if (!hw) {
798 ERROR_PROBE("Failed to allocate hardware.\n");
799 retval = -ENOMEM;
800 goto exit_put_device;
801 }
802
803 usb_set_intfdata(usb_intf, hw);
804
805 rt2x00dev = hw->priv;
806 rt2x00dev->dev = &usb_intf->dev;
807 rt2x00dev->ops = ops;
808 rt2x00dev->hw = hw;
809
810 rt2x00_set_chip_intf(rt2x00dev, RT2X00_CHIP_INTF_USB);
811
812 INIT_WORK(&rt2x00dev->rxdone_work, rt2x00usb_work_rxdone);
813 INIT_WORK(&rt2x00dev->txdone_work, rt2x00usb_work_txdone);
814 hrtimer_init(&rt2x00dev->txstatus_timer, CLOCK_MONOTONIC,
815 HRTIMER_MODE_REL);
816
817 retval = rt2x00usb_alloc_reg(rt2x00dev);
818 if (retval)
819 goto exit_free_device;
820
821 retval = rt2x00lib_probe_dev(rt2x00dev);
822 if (retval)
823 goto exit_free_reg;
824
825 return 0;
826
827exit_free_reg:
828 rt2x00usb_free_reg(rt2x00dev);
829
830exit_free_device:
831 ieee80211_free_hw(hw);
832
833exit_put_device:
834 usb_put_dev(usb_dev);
835
836 usb_set_intfdata(usb_intf, NULL);
837
838 return retval;
839}
840EXPORT_SYMBOL_GPL(rt2x00usb_probe);
841
842void rt2x00usb_disconnect(struct usb_interface *usb_intf)
843{
844 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
845 struct rt2x00_dev *rt2x00dev = hw->priv;
846
847 /*
848 * Free all allocated data.
849 */
850 rt2x00lib_remove_dev(rt2x00dev);
851 rt2x00usb_free_reg(rt2x00dev);
852 ieee80211_free_hw(hw);
853
854 /*
855 * Free the USB device data.
856 */
857 usb_set_intfdata(usb_intf, NULL);
858 usb_put_dev(interface_to_usbdev(usb_intf));
859}
860EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
861
862#ifdef CONFIG_PM
863int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
864{
865 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
866 struct rt2x00_dev *rt2x00dev = hw->priv;
867
868 return rt2x00lib_suspend(rt2x00dev, state);
869}
870EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
871
872int rt2x00usb_resume(struct usb_interface *usb_intf)
873{
874 struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
875 struct rt2x00_dev *rt2x00dev = hw->priv;
876
877 return rt2x00lib_resume(rt2x00dev);
878}
879EXPORT_SYMBOL_GPL(rt2x00usb_resume);
880#endif /* CONFIG_PM */
881
882/*
883 * rt2x00usb module information.
884 */
885MODULE_AUTHOR(DRV_PROJECT);
886MODULE_VERSION(DRV_VERSION);
887MODULE_DESCRIPTION("rt2x00 usb library");
888MODULE_LICENSE("GPL");