summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/rt2x00/rt2x00dev.c
blob: 265e66dba552c2e3d0188b6baad46c0a32a4d6fb (plain)
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
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
/*
	Copyright (C) 2004 - 2009 Ivo van Doorn <IvDoorn@gmail.com>
	<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: rt2x00lib
	Abstract: rt2x00 generic device routines.
 */

#include <linux/kernel.h>
#include <linux/module.h>

#include "rt2x00.h"
#include "rt2x00lib.h"

/*
 * Radio control handlers.
 */
int rt2x00lib_enable_radio(struct rt2x00_dev *rt2x00dev)
{
	int status;

	/*
	 * Don't enable the radio twice.
	 * And check if the hardware button has been disabled.
	 */
	if (test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
		return 0;

	/*
	 * Initialize all data queues.
	 */
	rt2x00queue_init_queues(rt2x00dev);

	/*
	 * Enable radio.
	 */
	status =
	    rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_ON);
	if (status)
		return status;

	rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_ON);

	rt2x00leds_led_radio(rt2x00dev, true);
	rt2x00led_led_activity(rt2x00dev, true);

	set_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags);

	/*
	 * Enable RX.
	 */
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_ON);

	/*
	 * Start the TX queues.
	 */
	ieee80211_wake_queues(rt2x00dev->hw);

	return 0;
}

void rt2x00lib_disable_radio(struct rt2x00_dev *rt2x00dev)
{
	if (!test_and_clear_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
		return;

	/*
	 * Stop the TX queues in mac80211.
	 */
	ieee80211_stop_queues(rt2x00dev->hw);
	rt2x00queue_stop_queues(rt2x00dev);

	/*
	 * Disable RX.
	 */
	rt2x00lib_toggle_rx(rt2x00dev, STATE_RADIO_RX_OFF);

	/*
	 * Disable radio.
	 */
	rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_OFF);
	rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_RADIO_IRQ_OFF);
	rt2x00led_led_activity(rt2x00dev, false);
	rt2x00leds_led_radio(rt2x00dev, false);
}

void rt2x00lib_toggle_rx(struct rt2x00_dev *rt2x00dev, enum dev_state state)
{
	/*
	 * When we are disabling the RX, we should also stop the link tuner.
	 */
	if (state == STATE_RADIO_RX_OFF)
		rt2x00link_stop_tuner(rt2x00dev);

	rt2x00dev->ops->lib->set_device_state(rt2x00dev, state);

	/*
	 * When we are enabling the RX, we should also start the link tuner.
	 */
	if (state == STATE_RADIO_RX_ON)
		rt2x00link_start_tuner(rt2x00dev);
}

static void rt2x00lib_intf_scheduled_iter(void *data, u8 *mac,
					  struct ieee80211_vif *vif)
{
	struct rt2x00_dev *rt2x00dev = data;
	struct rt2x00_intf *intf = vif_to_intf(vif);
	int delayed_flags;

	/*
	 * Copy all data we need during this action under the protection
	 * of a spinlock. Otherwise race conditions might occur which results
	 * into an invalid configuration.
	 */
	spin_lock(&intf->lock);

	delayed_flags = intf->delayed_flags;
	intf->delayed_flags = 0;

	spin_unlock(&intf->lock);

	/*
	 * It is possible the radio was disabled while the work had been
	 * scheduled. If that happens we should return here immediately,
	 * note that in the spinlock protected area above the delayed_flags
	 * have been cleared correctly.
	 */
	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
		return;

	if (delayed_flags & DELAYED_UPDATE_BEACON)
		rt2x00queue_update_beacon(rt2x00dev, vif, true);
}

static void rt2x00lib_intf_scheduled(struct work_struct *work)
{
	struct rt2x00_dev *rt2x00dev =
	    container_of(work, struct rt2x00_dev, intf_work);

	/*
	 * Iterate over each interface and perform the
	 * requested configurations.
	 */
	ieee80211_iterate_active_interfaces(rt2x00dev->hw,
					    rt2x00lib_intf_scheduled_iter,
					    rt2x00dev);
}

/*
 * Interrupt context handlers.
 */
static void rt2x00lib_beacondone_iter(void *data, u8 *mac,
				      struct ieee80211_vif *vif)
{
	struct rt2x00_intf *intf = vif_to_intf(vif);

	if (vif->type != NL80211_IFTYPE_AP &&
	    vif->type != NL80211_IFTYPE_ADHOC &&
	    vif->type != NL80211_IFTYPE_MESH_POINT &&
	    vif->type != NL80211_IFTYPE_WDS)
		return;

	spin_lock(&intf->lock);
	intf->delayed_flags |= DELAYED_UPDATE_BEACON;
	spin_unlock(&intf->lock);
}

void rt2x00lib_beacondone(struct rt2x00_dev *rt2x00dev)
{
	if (!test_bit(DEVICE_STATE_ENABLED_RADIO, &rt2x00dev->flags))
		return;

	ieee80211_iterate_active_interfaces_atomic(rt2x00dev->hw,
						   rt2x00lib_beacondone_iter,
						   rt2x00dev);

	ieee80211_queue_work(rt2x00dev->hw, &rt2x00dev->intf_work);
}
EXPORT_SYMBOL_GPL(rt2x00lib_beacondone);

void rt2x00lib_txdone(struct queue_entry *entry,
		      struct txdone_entry_desc *txdesc)
{
	struct rt2x00_dev *rt2x00dev = entry->queue->rt2x00dev;
	struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(entry->skb);
	struct skb_frame_desc *skbdesc = get_skb_frame_desc(entry->skb);
	enum data_queue_qid qid = skb_get_queue_mapping(entry->skb);
	unsigned int header_length = ieee80211_get_hdrlen_from_skb(entry->skb);
	u8 rate_idx, rate_flags, retry_rates;
	u8 skbdesc_flags = skbdesc->flags;
	unsigned int i;
	bool success;

	/*
	 * Unmap the skb.
	 */
	rt2x00queue_unmap_skb(rt2x00dev, entry->skb);

	/*
	 * Remove L2 padding which was added during
	 */
	if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
		rt2x00queue_remove_l2pad(entry->skb, header_length);

	/*
	 * If the IV/EIV data was stripped from the frame before it was
	 * passed to the hardware, we should now reinsert it again because
	 * mac80211 will expect the the same data to be present it the
	 * frame as it was passed to us.
	 */
	if (test_bit(CONFIG_SUPPORT_HW_CRYPTO, &rt2x00dev->flags))
		rt2x00crypto_tx_insert_iv(entry->skb, header_length);

	/*
	 * Send frame to debugfs immediately, after this call is completed
	 * we are going to overwrite the skb->cb array.
	 */
	rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_TXDONE, entry->skb);

	/*
	 * Determine if the frame has been successfully transmitted.
	 */
	success =
	    test_bit(TXDONE_SUCCESS, &txdesc->flags) ||
	    test_bit(TXDONE_UNKNOWN, &txdesc->flags) ||
	    test_bit(TXDONE_FALLBACK, &txdesc->flags);

	/*
	 * Update TX statistics.
	 */
	rt2x00dev->link.qual.tx_success += success;
	rt2x00dev->link.qual.tx_failed += !success;

	rate_idx = skbdesc->tx_rate_idx;
	rate_flags = skbdesc->tx_rate_flags;
	retry_rates = test_bit(TXDONE_FALLBACK, &txdesc->flags) ?
	    (txdesc->retry + 1) : 1;

	/*
	 * Initialize TX status
	 */
	memset(&tx_info->status, 0, sizeof(tx_info->status));
	tx_info->status.ack_signal = 0;

	/*
	 * Frame was send with retries, hardware tried
	 * different rates to send out the frame, at each
	 * retry it lowered the rate 1 step.
	 */
	for (i = 0; i < retry_rates && i < IEEE80211_TX_MAX_RATES; i++) {
		tx_info->status.rates[i].idx = rate_idx - i;
		tx_info->status.rates[i].flags = rate_flags;
		tx_info->status.rates[i].count = 1;
	}
	if (i < (IEEE80211_TX_MAX_RATES - 1))
		tx_info->status.rates[i].idx = -1; /* terminate */

	if (!(tx_info->flags & IEEE80211_TX_CTL_NO_ACK)) {
		if (success)
			tx_info->flags |= IEEE80211_TX_STAT_ACK;
		else
			rt2x00dev->low_level_stats.dot11ACKFailureCount++;
	}

	if (rate_flags & IEEE80211_TX_RC_USE_RTS_CTS) {
		if (success)
			rt2x00dev->low_level_stats.dot11RTSSuccessCount++;
		else
			rt2x00dev->low_level_stats.dot11RTSFailureCount++;
	}

	/*
	 * Only send the status report to mac80211 when it's a frame
	 * that originated in mac80211. If this was a extra frame coming
	 * through a mac80211 library call (RTS/CTS) then we should not
	 * send the status report back.
	 */
	if (!(skbdesc_flags & SKBDESC_NOT_MAC80211))
		ieee80211_tx_status_irqsafe(rt2x00dev->hw, entry->skb);
	else
		dev_kfree_skb_irq(entry->skb);

	/*
	 * Make this entry available for reuse.
	 */
	entry->skb = NULL;
	entry->flags = 0;

	rt2x00dev->ops->lib->clear_entry(entry);

	clear_bit(ENTRY_OWNER_DEVICE_DATA, &entry->flags);
	rt2x00queue_index_inc(entry->queue, Q_INDEX_DONE);

	/*
	 * If the data queue was below the threshold before the txdone
	 * handler we must make sure the packet queue in the mac80211 stack
	 * is reenabled when the txdone handler has finished.
	 */
	if (!rt2x00queue_threshold(entry->queue))
		ieee80211_wake_queue(rt2x00dev->hw, qid);
}
EXPORT_SYMBOL_GPL(rt2x00lib_txdone);

static int rt2x00lib_rxdone_read_signal(struct rt2x00_dev *rt2x00dev,
					struct rxdone_entry_desc *rxdesc)
{
	struct ieee80211_supported_band *sband;
	const struct rt2x00_rate *rate;
	unsigned int i;
	int signal;
	int type;

	/*
	 * For non-HT rates the MCS value needs to contain the
	 * actually used rate modulation (CCK or OFDM).
	 */
	if (rxdesc->dev_flags & RXDONE_SIGNAL_MCS)
		signal = RATE_MCS(rxdesc->rate_mode, rxdesc->signal);
	else
		signal = rxdesc->signal;

	type = (rxdesc->dev_flags & RXDONE_SIGNAL_MASK);

	sband = &rt2x00dev->bands[rt2x00dev->curr_band];
	for (i = 0; i < sband->n_bitrates; i++) {
		rate = rt2x00_get_rate(sband->bitrates[i].hw_value);

		if (((type == RXDONE_SIGNAL_PLCP) &&
		     (rate->plcp == signal)) ||
		    ((type == RXDONE_SIGNAL_BITRATE) &&
		      (rate->bitrate == signal)) ||
		    ((type == RXDONE_SIGNAL_MCS) &&
		      (rate->mcs == signal))) {
			return i;
		}
	}

	WARNING(rt2x00dev, "Frame received with unrecognized signal, "
		"signal=0x%.4x, type=%d.\n", signal, type);
	return 0;
}

void rt2x00lib_rxdone(struct rt2x00_dev *rt2x00dev,
		      struct queue_entry *entry)
{
	struct rxdone_entry_desc rxdesc;
	struct sk_buff *skb;
	struct ieee80211_rx_status *rx_status = &rt2x00dev->rx_status;
	unsigned int header_length;
	int rate_idx;
	/*
	 * Allocate a new sk_buffer. If no new buffer available, drop the
	 * received frame and reuse the existing buffer.
	 */
	skb = rt2x00queue_alloc_rxskb(rt2x00dev, entry);
	if (!skb)
		return;

	/*
	 * Unmap the skb.
	 */
	rt2x00queue_unmap_skb(rt2x00dev, entry->skb);

	/*
	 * Extract the RXD details.
	 */
	memset(&rxdesc, 0, sizeof(rxdesc));
	rt2x00dev->ops->lib->fill_rxdone(entry, &rxdesc);

	/* Trim buffer to correct size */
	skb_trim(entry->skb, rxdesc.size);

	/*
	 * The data behind the ieee80211 header must be
	 * aligned on a 4 byte boundary.
	 */
	header_length = ieee80211_get_hdrlen_from_skb(entry->skb);

	/*
	 * Hardware might have stripped the IV/EIV/ICV data,
	 * in that case it is possible that the data was
	 * provided seperately (through hardware descriptor)
	 * in which case we should reinsert the data into the frame.
	 */
	if ((rxdesc.dev_flags & RXDONE_CRYPTO_IV) &&
	    (rxdesc.flags & RX_FLAG_IV_STRIPPED))
		rt2x00crypto_rx_insert_iv(entry->skb, header_length,
					  &rxdesc);
	else if (rxdesc.dev_flags & RXDONE_L2PAD)
		rt2x00queue_remove_l2pad(entry->skb, header_length);
	else
		rt2x00queue_align_payload(entry->skb, header_length);

	/*
	 * Check if the frame was received using HT. In that case,
	 * the rate is the MCS index and should be passed to mac80211
	 * directly. Otherwise we need to translate the signal to
	 * the correct bitrate index.
	 */
	if (rxdesc.rate_mode == RATE_MODE_CCK ||
	    rxdesc.rate_mode == RATE_MODE_OFDM) {
		rate_idx = rt2x00lib_rxdone_read_signal(rt2x00dev, &rxdesc);
	} else {
		rxdesc.flags |= RX_FLAG_HT;
		rate_idx = rxdesc.signal;
	}

	/*
	 * Update extra components
	 */
	rt2x00link_update_stats(rt2x00dev, entry->skb, &rxdesc);
	rt2x00debug_update_crypto(rt2x00dev, &rxdesc);

	rx_status->mactime = rxdesc.timestamp;
	rx_status->rate_idx = rate_idx;
	rx_status->signal = rxdesc.rssi;
	rx_status->noise = rxdesc.noise;
	rx_status->flag = rxdesc.flags;
	rx_status->antenna = rt2x00dev->link.ant.active.rx;

	/*
	 * Send frame to mac80211 & debugfs.
	 * mac80211 will clean up the skb structure.
	 */
	rt2x00debug_dump_frame(rt2x00dev, DUMP_FRAME_RXDONE, entry->skb);
	memcpy(IEEE80211_SKB_RXCB(entry->skb), rx_status, sizeof(*rx_status));
	ieee80211_rx_irqsafe(rt2x00dev->hw, entry->skb);

	/*
	 * Replace the skb with the freshly allocated one.
	 */
	entry->skb = skb;
	entry->flags = 0;

	rt2x00dev->ops->lib->clear_entry(entry);

	rt2x00queue_index_inc(entry->queue, Q_INDEX);
}
EXPORT_SYMBOL_GPL(rt2x00lib_rxdone);

/*
 * Driver initialization handlers.
 */
const struct rt2x00_rate rt2x00_supported_rates[12] = {
	{
		.flags = DEV_RATE_CCK,
		.bitrate = 10,
		.ratemask = BIT(0),
		.plcp = 0x00,
		.mcs = RATE_MCS(RATE_MODE_CCK, 0),
	},
	{
		.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
		.bitrate = 20,
		.ratemask = BIT(1),
		.plcp = 0x01,
		.mcs = RATE_MCS(RATE_MODE_CCK, 1),
	},
	{
		.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
		.bitrate = 55,
		.ratemask = BIT(2),
		.plcp = 0x02,
		.mcs = RATE_MCS(RATE_MODE_CCK, 2),
	},
	{
		.flags = DEV_RATE_CCK | DEV_RATE_SHORT_PREAMBLE,
		.bitrate = 110,
		.ratemask = BIT(3),
		.plcp = 0x03,
		.mcs = RATE_MCS(RATE_MODE_CCK, 3),
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 60,
		.ratemask = BIT(4),
		.plcp = 0x0b,
		.mcs = RATE_MCS(RATE_MODE_OFDM, 0),
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 90,
		.ratemask = BIT(5),
		.plcp = 0x0f,
		.mcs = RATE_MCS(RATE_MODE_OFDM, 1),
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 120,
		.ratemask = BIT(6),
		.plcp = 0x0a,
		.mcs = RATE_MCS(RATE_MODE_OFDM, 2),
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 180,
		.ratemask = BIT(7),
		.plcp = 0x0e,
		.mcs = RATE_MCS(RATE_MODE_OFDM, 3),
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 240,
		.ratemask = BIT(8),
		.plcp = 0x09,
		.mcs = RATE_MCS(RATE_MODE_OFDM, 4),
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 360,
		.ratemask = BIT(9),
		.plcp = 0x0d,
		.mcs = RATE_MCS(RATE_MODE_OFDM, 5),
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 480,
		.ratemask = BIT(10),
		.plcp = 0x08,
		.mcs = RATE_MCS(RATE_MODE_OFDM, 6),
	},
	{
		.flags = DEV_RATE_OFDM,
		.bitrate = 540,
		.ratemask = BIT(11),
		.plcp = 0x0c,
		.mcs = RATE_MCS(RATE_MODE_OFDM, 7),
	},
};

static void rt2x00lib_channel(struct ieee80211_channel *entry,
			      const int channel, const int tx_power,
			      const int value)
{
	entry->center_freq = ieee80211_channel_to_frequency(channel);
	entry->hw_value = value;
	entry->max_power = tx_power;
	entry->max_antenna_gain = 0xff;
}

static void rt2x00lib_rate(struct ieee80211_rate *entry,
			   const u16 index, const struct rt2x00_rate *rate)
{
	entry->flags = 0;
	entry->bitrate = rate->bitrate;
	entry->hw_value =index;
	entry->hw_value_short = index;

	if (rate->flags & DEV_RATE_SHORT_PREAMBLE)
		entry->flags |= IEEE80211_RATE_SHORT_PREAMBLE;
}

static int rt2x00lib_probe_hw_modes(struct rt2x00_dev *rt2x00dev,
				    struct hw_mode_spec *spec)
{
	struct ieee80211_hw *hw = rt2x00dev->hw;
	struct ieee80211_channel *channels;
	struct ieee80211_rate *rates;
	unsigned int num_rates;
	unsigned int i;

	num_rates = 0;
	if (spec->supported_rates & SUPPORT_RATE_CCK)
		num_rates += 4;
	if (spec->supported_rates & SUPPORT_RATE_OFDM)
		num_rates += 8;

	channels = kzalloc(sizeof(*channels) * spec->num_channels, GFP_KERNEL);
	if (!channels)
		return -ENOMEM;

	rates = kzalloc(sizeof(*rates) * num_rates, GFP_KERNEL);
	if (!rates)
		goto exit_free_channels;

	/*
	 * Initialize Rate list.
	 */
	for (i = 0; i < num_rates; i++)
		rt2x00lib_rate(&rates[i], i, rt2x00_get_rate(i));

	/*
	 * Initialize Channel list.
	 */
	for (i = 0; i < spec->num_channels; i++) {
		rt2x00lib_channel(&channels[i],
				  spec->channels[i].channel,
				  spec->channels_info[i].tx_power1, i);
	}

	/*
	 * Intitialize 802.11b, 802.11g
	 * Rates: CCK, OFDM.
	 * Channels: 2.4 GHz
	 */
	if (spec->supported_bands & SUPPORT_BAND_2GHZ) {
		rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_channels = 14;
		rt2x00dev->bands[IEEE80211_BAND_2GHZ].n_bitrates = num_rates;
		rt2x00dev->bands[IEEE80211_BAND_2GHZ].channels = channels;
		rt2x00dev->bands[IEEE80211_BAND_2GHZ].bitrates = rates;
		hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
		    &rt2x00dev->bands[IEEE80211_BAND_2GHZ];
		memcpy(&rt2x00dev->bands[IEEE80211_BAND_2GHZ].ht_cap,
		       &spec->ht, sizeof(spec->ht));
	}

	/*
	 * Intitialize 802.11a
	 * Rates: OFDM.
	 * Channels: OFDM, UNII, HiperLAN2.
	 */
	if (spec->supported_bands & SUPPORT_BAND_5GHZ) {
		rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_channels =
		    spec->num_channels - 14;
		rt2x00dev->bands[IEEE80211_BAND_5GHZ].n_bitrates =
		    num_rates - 4;
		rt2x00dev->bands[IEEE80211_BAND_5GHZ].channels = &channels[14];
		rt2x00dev->bands[IEEE80211_BAND_5GHZ].bitrates = &rates[4];
		hw->wiphy->bands[IEEE80211_BAND_5GHZ] =
		    &rt2x00dev->bands[IEEE80211_BAND_5GHZ];
		memcpy(&rt2x00dev->bands[IEEE80211_BAND_5GHZ].ht_cap,
		       &spec->ht, sizeof(spec->ht));
	}

	return 0;

 exit_free_channels:
	kfree(channels);
	ERROR(rt2x00dev, "Allocation ieee80211 modes failed.\n");
	return -ENOMEM;
}

static void rt2x00lib_remove_hw(struct rt2x00_dev *rt2x00dev)
{
	if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
		ieee80211_unregister_hw(rt2x00dev->hw);

	if (likely(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ])) {
		kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->channels);
		kfree(rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ]->bitrates);
		rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_2GHZ] = NULL;
		rt2x00dev->hw->wiphy->bands[IEEE80211_BAND_5GHZ] = NULL;
	}

	kfree(rt2x00dev->spec.channels_info);
}

static int rt2x00lib_probe_hw(struct rt2x00_dev *rt2x00dev)
{
	struct hw_mode_spec *spec = &rt2x00dev->spec;
	int status;

	if (test_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags))
		return 0;

	/*
	 * Initialize HW modes.
	 */
	status = rt2x00lib_probe_hw_modes(rt2x00dev, spec);
	if (status)
		return status;

	/*
	 * Initialize HW fields.
	 */
	rt2x00dev->hw->queues = rt2x00dev->ops->tx_queues;

	/*
	 * Initialize extra TX headroom required.
	 */
	rt2x00dev->hw->extra_tx_headroom =
		max_t(unsigned int, IEEE80211_TX_STATUS_HEADROOM,
		      rt2x00dev->ops->extra_tx_headroom);

	/*
	 * Take TX headroom required for alignment into account.
	 */
	if (test_bit(DRIVER_REQUIRE_L2PAD, &rt2x00dev->flags))
		rt2x00dev->hw->extra_tx_headroom += RT2X00_L2PAD_SIZE;
	else if (test_bit(DRIVER_REQUIRE_DMA, &rt2x00dev->flags))
		rt2x00dev->hw->extra_tx_headroom += RT2X00_ALIGN_SIZE;

	/*
	 * Register HW.
	 */
	status = ieee80211_register_hw(rt2x00dev->hw);
	if (status)
		return status;

	set_bit(DEVICE_STATE_REGISTERED_HW, &rt2x00dev->flags);

	return 0;
}

/*
 * Initialization/uninitialization handlers.
 */
static void rt2x00lib_uninitialize(struct rt2x00_dev *rt2x00dev)
{
	if (!test_and_clear_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
		return;

	/*
	 * Unregister extra components.
	 */
	rt2x00rfkill_unregister(rt2x00dev);

	/*
	 * Allow the HW to uninitialize.
	 */
	rt2x00dev->ops->lib->uninitialize(rt2x00dev);

	/*
	 * Free allocated queue entries.
	 */
	rt2x00queue_uninitialize(rt2x00dev);
}

static int rt2x00lib_initialize(struct rt2x00_dev *rt2x00dev)
{
	int status;

	if (test_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags))
		return 0;

	/*
	 * Allocate all queue entries.
	 */
	status = rt2x00queue_initialize(rt2x00dev);
	if (status)
		return status;

	/*
	 * Initialize the device.
	 */
	status = rt2x00dev->ops->lib->initialize(rt2x00dev);
	if (status) {
		rt2x00queue_uninitialize(rt2x00dev);
		return status;
	}

	set_bit(DEVICE_STATE_INITIALIZED, &rt2x00dev->flags);

	/*
	 * Register the extra components.
	 */
	rt2x00rfkill_register(rt2x00dev);

	return 0;
}

int rt2x00lib_start(struct rt2x00_dev *rt2x00dev)
{
	int retval;

	if (test_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
		return 0;

	/*
	 * If this is the first interface which is added,
	 * we should load the firmware now.
	 */
	retval = rt2x00lib_load_firmware(rt2x00dev);
	if (retval)
		return retval;

	/*
	 * Initialize the device.
	 */
	retval = rt2x00lib_initialize(rt2x00dev);
	if (retval)
		return retval;

	rt2x00dev->intf_ap_count = 0;
	rt2x00dev->intf_sta_count = 0;
	rt2x00dev->intf_associated = 0;

	/* Enable the radio */
	retval = rt2x00lib_enable_radio(rt2x00dev);
	if (retval) {
		rt2x00queue_uninitialize(rt2x00dev);
		return retval;
	}

	set_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags);

	return 0;
}

void rt2x00lib_stop(struct rt2x00_dev *rt2x00dev)
{
	if (!test_and_clear_bit(DEVICE_STATE_STARTED, &rt2x00dev->flags))
		return;

	/*
	 * Perhaps we can add something smarter here,
	 * but for now just disabling the radio should do.
	 */
	rt2x00lib_disable_radio(rt2x00dev);

	rt2x00dev->intf_ap_count = 0;
	rt2x00dev->intf_sta_count = 0;
	rt2x00dev->intf_associated = 0;
}

/*
 * driver allocation handlers.
 */
int rt2x00lib_probe_dev(struct rt2x00_dev *rt2x00dev)
{
	int retval = -ENOMEM;

	mutex_init(&rt2x00dev->csr_mutex);

	set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);

	/*
	 * Make room for rt2x00_intf inside the per-interface
	 * structure ieee80211_vif.
	 */
	rt2x00dev->hw->vif_data_size = sizeof(struct rt2x00_intf);

	/*
	 * Determine which operating modes are supported, all modes
	 * which require beaconing, depend on the availability of
	 * beacon entries.
	 */
	rt2x00dev->hw->wiphy->interface_modes = BIT(NL80211_IFTYPE_STATION);
	if (rt2x00dev->ops->bcn->entry_num > 0)
		rt2x00dev->hw->wiphy->interface_modes |=
		    BIT(NL80211_IFTYPE_ADHOC) |
		    BIT(NL80211_IFTYPE_AP) |
		    BIT(NL80211_IFTYPE_MESH_POINT) |
		    BIT(NL80211_IFTYPE_WDS);

	/*
	 * Let the driver probe the device to detect the capabilities.
	 */
	retval = rt2x00dev->ops->lib->probe_hw(rt2x00dev);
	if (retval) {
		ERROR(rt2x00dev, "Failed to allocate device.\n");
		goto exit;
	}

	/*
	 * Initialize configuration work.
	 */
	INIT_WORK(&rt2x00dev->intf_work, rt2x00lib_intf_scheduled);

	/*
	 * Allocate queue array.
	 */
	retval = rt2x00queue_allocate(rt2x00dev);
	if (retval)
		goto exit;

	/*
	 * Initialize ieee80211 structure.
	 */
	retval = rt2x00lib_probe_hw(rt2x00dev);
	if (retval) {
		ERROR(rt2x00dev, "Failed to initialize hw.\n");
		goto exit;
	}

	/*
	 * Register extra components.
	 */
	rt2x00link_register(rt2x00dev);
	rt2x00leds_register(rt2x00dev);
	rt2x00debug_register(rt2x00dev);

	return 0;

exit:
	rt2x00lib_remove_dev(rt2x00dev);

	return retval;
}
EXPORT_SYMBOL_GPL(rt2x00lib_probe_dev);

void rt2x00lib_remove_dev(struct rt2x00_dev *rt2x00dev)
{
	clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);

	/*
	 * Disable radio.
	 */
	rt2x00lib_disable_radio(rt2x00dev);

	/*
	 * Stop all work.
	 */
	cancel_work_sync(&rt2x00dev->intf_work);

	/*
	 * Uninitialize device.
	 */
	rt2x00lib_uninitialize(rt2x00dev);

	/*
	 * Free extra components
	 */
	rt2x00debug_deregister(rt2x00dev);
	rt2x00leds_unregister(rt2x00dev);

	/*
	 * Free ieee80211_hw memory.
	 */
	rt2x00lib_remove_hw(rt2x00dev);

	/*
	 * Free firmware image.
	 */
	rt2x00lib_free_firmware(rt2x00dev);

	/*
	 * Free queue structures.
	 */
	rt2x00queue_free(rt2x00dev);
}
EXPORT_SYMBOL_GPL(rt2x00lib_remove_dev);

/*
 * Device state handlers
 */
#ifdef CONFIG_PM
int rt2x00lib_suspend(struct rt2x00_dev *rt2x00dev, pm_message_t state)
{
	NOTICE(rt2x00dev, "Going to sleep.\n");

	/*
	 * Prevent mac80211 from accessing driver while suspended.
	 */
	if (!test_and_clear_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags))
		return 0;

	/*
	 * Cleanup as much as possible.
	 */
	rt2x00lib_uninitialize(rt2x00dev);

	/*
	 * Suspend/disable extra components.
	 */
	rt2x00leds_suspend(rt2x00dev);
	rt2x00debug_deregister(rt2x00dev);

	/*
	 * Set device mode to sleep for power management,
	 * on some hardware this call seems to consistently fail.
	 * From the specifications it is hard to tell why it fails,
	 * and if this is a "bad thing".
	 * Overall it is safe to just ignore the failure and
	 * continue suspending. The only downside is that the
	 * device will not be in optimal power save mode, but with
	 * the radio and the other components already disabled the
	 * device is as good as disabled.
	 */
	if (rt2x00dev->ops->lib->set_device_state(rt2x00dev, STATE_SLEEP))
		WARNING(rt2x00dev, "Device failed to enter sleep state, "
			"continue suspending.\n");

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_suspend);

int rt2x00lib_resume(struct rt2x00_dev *rt2x00dev)
{
	NOTICE(rt2x00dev, "Waking up.\n");

	/*
	 * Restore/enable extra components.
	 */
	rt2x00debug_register(rt2x00dev);
	rt2x00leds_resume(rt2x00dev);

	/*
	 * We are ready again to receive requests from mac80211.
	 */
	set_bit(DEVICE_STATE_PRESENT, &rt2x00dev->flags);

	return 0;
}
EXPORT_SYMBOL_GPL(rt2x00lib_resume);
#endif /* CONFIG_PM */

/*
 * rt2x00lib module information.
 */
MODULE_AUTHOR(DRV_PROJECT);
MODULE_VERSION(DRV_VERSION);
MODULE_DESCRIPTION("rt2x00 library");
MODULE_LICENSE("GPL");