1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
|
/*
Copyright (C) 2004 - 2007 rt2x00 SourceForge Project
<http://rt2x00.serialmonkey.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the
Free Software Foundation, Inc.,
59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/*
Module: rt2x00usb
Abstract: rt2x00 generic usb device routines.
*/
/*
* Set enviroment defines for rt2x00.h
*/
#define DRV_NAME "rt2x00usb"
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
#include "rt2x00.h"
#include "rt2x00usb.h"
/*
* Interfacing with the HW.
*/
int rt2x00usb_vendor_request(const struct rt2x00_dev *rt2x00dev,
const u8 request, const u8 requesttype,
const u16 offset, const u16 value,
void *buffer, const u16 buffer_length,
u16 timeout)
{
struct usb_device *usb_dev =
interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
int status;
unsigned int i;
unsigned int pipe =
(requesttype == USB_VENDOR_REQUEST_IN) ?
usb_rcvctrlpipe(usb_dev, 0) : usb_sndctrlpipe(usb_dev, 0);
for (i = 0; i < REGISTER_BUSY_COUNT; i++) {
status = usb_control_msg(usb_dev, pipe, request, requesttype,
value, offset, buffer, buffer_length,
timeout);
if (status >= 0)
return 0;
/*
* Check for errors,
* -ETIMEDOUT: We need a bit more time to complete.
* -ENODEV: Device has disappeared, no point continuing.
*/
if (status == -ETIMEDOUT)
timeout *= 2;
else if (status == -ENODEV)
break;
}
ERROR(rt2x00dev,
"Vendor Request 0x%02x failed for offset 0x%04x with error %d.\n",
request, offset, status);
return status;
}
EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request);
int rt2x00usb_vendor_request_buff(const struct rt2x00_dev *rt2x00dev,
const u8 request, const u8 requesttype,
const u16 offset, void *buffer,
const u16 buffer_length, u16 timeout)
{
int status;
/*
* Check for Cache availability.
*/
if (unlikely(!rt2x00dev->csr_cache || buffer_length > CSR_CACHE_SIZE)) {
ERROR(rt2x00dev, "CSR cache not available.\n");
return -ENOMEM;
}
if (requesttype == USB_VENDOR_REQUEST_OUT)
memcpy(rt2x00dev->csr_cache, buffer, buffer_length);
status = rt2x00usb_vendor_request(rt2x00dev, request, requesttype,
offset, 0, rt2x00dev->csr_cache,
buffer_length, timeout);
if (!status && requesttype == USB_VENDOR_REQUEST_IN)
memcpy(buffer, rt2x00dev->csr_cache, buffer_length);
return status;
}
EXPORT_SYMBOL_GPL(rt2x00usb_vendor_request_buff);
/*
* TX data handlers.
*/
static void rt2x00usb_interrupt_txdone(struct urb *urb)
{
struct data_entry *entry = (struct data_entry *)urb->context;
struct data_ring *ring = entry->ring;
struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
struct data_desc *txd = (struct data_desc *)entry->skb->data;
u32 word;
int tx_status;
if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
!__test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
return;
rt2x00_desc_read(txd, 0, &word);
/*
* Remove the descriptor data from the buffer.
*/
skb_pull(entry->skb, ring->desc_size);
/*
* Obtain the status about this packet.
*/
tx_status = !urb->status ? TX_SUCCESS : TX_FAIL_RETRY;
rt2x00lib_txdone(entry, tx_status, 0);
/*
* Make this entry available for reuse.
*/
entry->flags = 0;
rt2x00_ring_index_done_inc(entry->ring);
/*
* If the data ring was full before the txdone handler
* we must make sure the packet queue in the mac80211 stack
* is reenabled when the txdone handler has finished.
*/
if (!rt2x00_ring_full(ring))
ieee80211_wake_queue(rt2x00dev->hw,
entry->tx_status.control.queue);
}
int rt2x00usb_write_tx_data(struct rt2x00_dev *rt2x00dev,
struct data_ring *ring, struct sk_buff *skb,
struct ieee80211_tx_control *control)
{
struct usb_device *usb_dev =
interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
struct ieee80211_hdr *ieee80211hdr = (struct ieee80211_hdr *)skb->data;
struct data_entry *entry = rt2x00_get_data_entry(ring);
u32 length = skb->len;
if (rt2x00_ring_full(ring)) {
ieee80211_stop_queue(rt2x00dev->hw, control->queue);
return -EINVAL;
}
if (test_bit(ENTRY_OWNER_NIC, &entry->flags)) {
ERROR(rt2x00dev,
"Arrived at non-free entry in the non-full queue %d.\n"
"Please file bug report to %s.\n",
control->queue, DRV_PROJECT);
ieee80211_stop_queue(rt2x00dev->hw, control->queue);
return -EINVAL;
}
/*
* Add the descriptor in front of the skb.
*/
skb_push(skb, rt2x00dev->hw->extra_tx_headroom);
memset(skb->data, 0x00, rt2x00dev->hw->extra_tx_headroom);
rt2x00lib_write_tx_desc(rt2x00dev, (struct data_desc *)skb->data,
ieee80211hdr, length, control);
memcpy(&entry->tx_status.control, control, sizeof(*control));
entry->skb = skb;
/*
* Length passed to usb_fill_urb cannot be an odd number,
* so add 1 byte to make it even.
*/
length += rt2x00dev->hw->extra_tx_headroom;
if (length % 2)
length++;
__set_bit(ENTRY_OWNER_NIC, &entry->flags);
usb_fill_bulk_urb(entry->priv, usb_dev,
usb_sndbulkpipe(usb_dev, 1),
skb->data, length, rt2x00usb_interrupt_txdone, entry);
usb_submit_urb(entry->priv, GFP_ATOMIC);
rt2x00_ring_index_inc(ring);
if (rt2x00_ring_full(ring))
ieee80211_stop_queue(rt2x00dev->hw, control->queue);
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00usb_write_tx_data);
/*
* RX data handlers.
*/
static void rt2x00usb_interrupt_rxdone(struct urb *urb)
{
struct data_entry *entry = (struct data_entry *)urb->context;
struct data_ring *ring = entry->ring;
struct rt2x00_dev *rt2x00dev = ring->rt2x00dev;
struct sk_buff *skb;
struct rxdata_entry_desc desc;
int frame_size;
if (!test_bit(DEVICE_ENABLED_RADIO, &rt2x00dev->flags) ||
!test_and_clear_bit(ENTRY_OWNER_NIC, &entry->flags))
return;
/*
* Check if the received data is simply too small
* to be actually valid, or if the urb is signaling
* a problem.
*/
if (urb->actual_length < entry->ring->desc_size || urb->status)
goto skip_entry;
memset(&desc, 0x00, sizeof(desc));
rt2x00dev->ops->lib->fill_rxdone(entry, &desc);
/*
* Allocate a new sk buffer to replace the current one.
* If allocation fails, we should drop the current frame
* so we can recycle the existing sk buffer for the new frame.
*/
frame_size = entry->ring->data_size + entry->ring->desc_size;
skb = dev_alloc_skb(frame_size + NET_IP_ALIGN);
if (!skb)
goto skip_entry;
skb_reserve(skb, NET_IP_ALIGN);
skb_put(skb, frame_size);
/*
* Trim the skb_buffer to only contain the valid
* frame data (so ignore the device's descriptor).
*/
skb_trim(entry->skb, desc.size);
/*
* Send the frame to rt2x00lib for further processing.
*/
rt2x00lib_rxdone(entry, entry->skb, &desc);
/*
* Replace current entry's skb with the newly allocated one,
* and reinitialize the urb.
*/
entry->skb = skb;
urb->transfer_buffer = entry->skb->data;
urb->transfer_buffer_length = entry->skb->len;
skip_entry:
if (test_bit(DEVICE_ENABLED_RADIO, &ring->rt2x00dev->flags)) {
__set_bit(ENTRY_OWNER_NIC, &entry->flags);
usb_submit_urb(urb, GFP_ATOMIC);
}
rt2x00_ring_index_inc(ring);
}
/*
* Radio handlers
*/
void rt2x00usb_enable_radio(struct rt2x00_dev *rt2x00dev)
{
struct usb_device *usb_dev =
interface_to_usbdev(rt2x00dev_usb(rt2x00dev));
struct data_ring *ring;
struct data_entry *entry;
unsigned int i;
/*
* Initialize the TX rings
*/
txringall_for_each(rt2x00dev, ring) {
for (i = 0; i < ring->stats.limit; i++)
ring->entry[i].flags = 0;
rt2x00_ring_index_clear(ring);
}
/*
* Initialize and start the RX ring.
*/
rt2x00_ring_index_clear(rt2x00dev->rx);
for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
entry = &rt2x00dev->rx->entry[i];
usb_fill_bulk_urb(entry->priv, usb_dev,
usb_rcvbulkpipe(usb_dev, 1),
entry->skb->data, entry->skb->len,
rt2x00usb_interrupt_rxdone, entry);
__set_bit(ENTRY_OWNER_NIC, &entry->flags);
usb_submit_urb(entry->priv, GFP_ATOMIC);
}
}
EXPORT_SYMBOL_GPL(rt2x00usb_enable_radio);
void rt2x00usb_disable_radio(struct rt2x00_dev *rt2x00dev)
{
struct data_ring *ring;
unsigned int i;
rt2x00usb_vendor_request_sw(rt2x00dev, USB_RX_CONTROL, 0x0000, 0x0000,
REGISTER_TIMEOUT);
/*
* Cancel all rings.
*/
ring_for_each(rt2x00dev, ring) {
for (i = 0; i < ring->stats.limit; i++)
usb_kill_urb(ring->entry[i].priv);
}
}
EXPORT_SYMBOL_GPL(rt2x00usb_disable_radio);
/*
* Device initialization handlers.
*/
static int rt2x00usb_alloc_urb(struct rt2x00_dev *rt2x00dev,
struct data_ring *ring)
{
unsigned int i;
/*
* Allocate the URB's
*/
for (i = 0; i < ring->stats.limit; i++) {
ring->entry[i].priv = usb_alloc_urb(0, GFP_KERNEL);
if (!ring->entry[i].priv)
return -ENOMEM;
}
return 0;
}
static void rt2x00usb_free_urb(struct rt2x00_dev *rt2x00dev,
struct data_ring *ring)
{
unsigned int i;
if (!ring->entry)
return;
for (i = 0; i < ring->stats.limit; i++) {
usb_kill_urb(ring->entry[i].priv);
usb_free_urb(ring->entry[i].priv);
if (ring->entry[i].skb)
kfree_skb(ring->entry[i].skb);
}
}
int rt2x00usb_initialize(struct rt2x00_dev *rt2x00dev)
{
struct data_ring *ring;
struct sk_buff *skb;
unsigned int entry_size;
unsigned int i;
int status;
/*
* Allocate DMA
*/
ring_for_each(rt2x00dev, ring) {
status = rt2x00usb_alloc_urb(rt2x00dev, ring);
if (status)
goto exit;
}
/*
* For the RX ring, skb's should be allocated.
*/
entry_size = rt2x00dev->rx->data_size + rt2x00dev->rx->desc_size;
for (i = 0; i < rt2x00dev->rx->stats.limit; i++) {
skb = dev_alloc_skb(NET_IP_ALIGN + entry_size);
if (!skb)
goto exit;
skb_reserve(skb, NET_IP_ALIGN);
skb_put(skb, entry_size);
rt2x00dev->rx->entry[i].skb = skb;
}
return 0;
exit:
rt2x00usb_uninitialize(rt2x00dev);
return status;
}
EXPORT_SYMBOL_GPL(rt2x00usb_initialize);
void rt2x00usb_uninitialize(struct rt2x00_dev *rt2x00dev)
{
struct data_ring *ring;
ring_for_each(rt2x00dev, ring)
rt2x00usb_free_urb(rt2x00dev, ring);
}
EXPORT_SYMBOL_GPL(rt2x00usb_uninitialize);
/*
* USB driver handlers.
*/
static void rt2x00usb_free_reg(struct rt2x00_dev *rt2x00dev)
{
kfree(rt2x00dev->rf);
rt2x00dev->rf = NULL;
kfree(rt2x00dev->eeprom);
rt2x00dev->eeprom = NULL;
kfree(rt2x00dev->csr_cache);
rt2x00dev->csr_cache = NULL;
}
static int rt2x00usb_alloc_reg(struct rt2x00_dev *rt2x00dev)
{
rt2x00dev->csr_cache = kzalloc(CSR_CACHE_SIZE, GFP_KERNEL);
if (!rt2x00dev->csr_cache)
goto exit;
rt2x00dev->eeprom = kzalloc(rt2x00dev->ops->eeprom_size, GFP_KERNEL);
if (!rt2x00dev->eeprom)
goto exit;
rt2x00dev->rf = kzalloc(rt2x00dev->ops->rf_size, GFP_KERNEL);
if (!rt2x00dev->rf)
goto exit;
return 0;
exit:
ERROR_PROBE("Failed to allocate registers.\n");
rt2x00usb_free_reg(rt2x00dev);
return -ENOMEM;
}
int rt2x00usb_probe(struct usb_interface *usb_intf,
const struct usb_device_id *id)
{
struct usb_device *usb_dev = interface_to_usbdev(usb_intf);
struct rt2x00_ops *ops = (struct rt2x00_ops *)id->driver_info;
struct ieee80211_hw *hw;
struct rt2x00_dev *rt2x00dev;
int retval;
usb_dev = usb_get_dev(usb_dev);
hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
if (!hw) {
ERROR_PROBE("Failed to allocate hardware.\n");
retval = -ENOMEM;
goto exit_put_device;
}
usb_set_intfdata(usb_intf, hw);
rt2x00dev = hw->priv;
rt2x00dev->dev = usb_intf;
rt2x00dev->ops = ops;
rt2x00dev->hw = hw;
retval = rt2x00usb_alloc_reg(rt2x00dev);
if (retval)
goto exit_free_device;
retval = rt2x00lib_probe_dev(rt2x00dev);
if (retval)
goto exit_free_reg;
return 0;
exit_free_reg:
rt2x00usb_free_reg(rt2x00dev);
exit_free_device:
ieee80211_free_hw(hw);
exit_put_device:
usb_put_dev(usb_dev);
usb_set_intfdata(usb_intf, NULL);
return retval;
}
EXPORT_SYMBOL_GPL(rt2x00usb_probe);
void rt2x00usb_disconnect(struct usb_interface *usb_intf)
{
struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
struct rt2x00_dev *rt2x00dev = hw->priv;
/*
* Free all allocated data.
*/
rt2x00lib_remove_dev(rt2x00dev);
rt2x00usb_free_reg(rt2x00dev);
ieee80211_free_hw(hw);
/*
* Free the USB device data.
*/
usb_set_intfdata(usb_intf, NULL);
usb_put_dev(interface_to_usbdev(usb_intf));
}
EXPORT_SYMBOL_GPL(rt2x00usb_disconnect);
#ifdef CONFIG_PM
int rt2x00usb_suspend(struct usb_interface *usb_intf, pm_message_t state)
{
struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
struct rt2x00_dev *rt2x00dev = hw->priv;
int retval;
retval = rt2x00lib_suspend(rt2x00dev, state);
if (retval)
return retval;
rt2x00usb_free_reg(rt2x00dev);
/*
* Decrease usbdev refcount.
*/
usb_put_dev(interface_to_usbdev(usb_intf));
return 0;
}
EXPORT_SYMBOL_GPL(rt2x00usb_suspend);
int rt2x00usb_resume(struct usb_interface *usb_intf)
{
struct ieee80211_hw *hw = usb_get_intfdata(usb_intf);
struct rt2x00_dev *rt2x00dev = hw->priv;
int retval;
usb_get_dev(interface_to_usbdev(usb_intf));
retval = rt2x00usb_alloc_reg(rt2x00dev);
if (retval)
return retval;
retval = rt2x00lib_resume(rt2x00dev);
if (retval)
goto exit_free_reg;
return 0;
exit_free_reg:
rt2x00usb_free_reg(rt2x00dev);
return retval;
}
EXPORT_SYMBOL_GPL(rt2x00usb_resume);
#endif /* CONFIG_PM */
/*
* rt2x00pci module information.
*/
MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2x00 library");
MODULE_LICENSE("GPL");
|