aboutsummaryrefslogtreecommitdiffstats
path: root/package/rt2x00/src/rt2x00.h
blob: 33b5094358e2d11b00b992aeeb232e5a8d06cae4 (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
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
/*
	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: rt2x00
	Abstract: rt2x00 global information.
	Supported chipsets: RT2460, RT2560, RT2570,
	rt2561, rt2561s, rt2661, rt2571W & rt2671.
 */

#ifndef RT2X00_H
#define RT2X00_H

#include <linux/bitops.h>
#include <linux/prefetch.h>
#include <linux/skbuff.h>
#include <linux/workqueue.h>

#include <net/mac80211.h>

/*
 * Module information.
 * DRV_NAME should be set within the individual module source files.
 */
#define DRV_VERSION	"2.0.2"
#define DRV_PROJECT	"http://rt2x00.serialmonkey.com"

/*
 * Debug definitions.
 * Debug output has to be enabled during compile time.
 */
#define DEBUG_PRINTK_MSG(__dev, __kernlvl, __lvl, __msg, __args...)	\
	printk(__kernlvl "%s -> %s: %s - " __msg,			\
		wiphy_name(rt2x00dev->hw->wiphy),			\
		__FUNCTION__, __lvl, ##__args)

#define DEBUG_PRINTK_PROBE(__kernlvl, __lvl, __msg, __args...)		\
	printk(__kernlvl "%s -> %s: %s - " __msg,			\
		DRV_NAME, __FUNCTION__, __lvl, 	##__args)

#ifdef CONFIG_RT2X00_DEBUG
#define DEBUG_PRINTK(__dev, __kernlvl, __lvl, __msg, __args...) \
	DEBUG_PRINTK_MSG(__dev, __kernlvl, __lvl, __msg, ##__args);
#else /* CONFIG_RT2X00_DEBUG */
#define DEBUG_PRINTK(__dev, __kernlvl, __lvl, __msg, __args...) \
	do { } while (0)
#endif /* CONFIG_RT2X00_DEBUG */

/*
 * Various debug levels.
 * The debug levels PANIC and ERROR both indicate serious problems,
 * for this reason they should never be ignored.
 * The special ERROR_PROBE message is for messages that are generated
 * when the rt2x00_dev is not yet initialized.
 */
#define PANIC(__dev, __msg, __args...) \
	DEBUG_PRINTK_MSG(__dev, KERN_CRIT, "Panic", __msg, ##__args)
#define ERROR(__dev, __msg, __args...)	\
	DEBUG_PRINTK_MSG(__dev, KERN_ERR, "Error", __msg, ##__args)
#define ERROR_PROBE(__msg, __args...) \
	DEBUG_PRINTK_PROBE(KERN_ERR, "Error", __msg, ##__args)
#define WARNING(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_WARNING, "Warning", __msg, ##__args)
#define NOTICE(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_NOTICE, "Notice", __msg, ##__args)
#define INFO(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_INFO, "Info", __msg, ##__args)
#define DEBUG(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_DEBUG, "Debug", __msg, ##__args)
#define EEPROM(__dev, __msg, __args...) \
	DEBUG_PRINTK(__dev, KERN_DEBUG, "EEPROM recovery", __msg, ##__args)

/*
 * Ring sizes.
 * Ralink PCI devices demand the Frame size to be a multiple of 128 bytes.
 * DATA_FRAME_SIZE is used for TX, RX, ATIM and PRIO rings.
 * MGMT_FRAME_SIZE is used for the BEACON ring.
 */
#define DATA_FRAME_SIZE	2432
#define MGMT_FRAME_SIZE	256

/*
 * Number of entries in a packet ring.
 */
#define RX_ENTRIES	12
#define TX_ENTRIES	12
#define ATIM_ENTRIES	1
#define BEACON_ENTRIES	1

/*
 * Standard timing and size defines.
 */
#define ACK_SIZE		14
#define IEEE80211_HEADER	24
#define PLCP			48
#define BEACON			100
#define PREAMBLE		144
#define SHORT_PREAMBLE		72
#define SLOT_TIME		20
#define SHORT_SLOT_TIME		9
#define SIFS			10
#define PIFS			( SIFS + SLOT_TIME )
#define SHORT_PIFS		( SIFS + SHORT_SLOT_TIME )
#define DIFS			( PIFS + SLOT_TIME )
#define SHORT_DIFS		( SHORT_PIFS + SHORT_SLOT_TIME )
#define EIFS			( SIFS + (8 * (IEEE80211_HEADER + ACK_SIZE)) )

/*
 * IEEE802.11 header defines
 */
#define is_rts_frame(__fc) \
	( !!((((__fc) &  IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) && \
	     (((__fc) &  IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_RTS)) )
#define is_cts_frame(__fc) \
	( !!((((__fc) &  IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_CTL) && \
	     (((__fc) &  IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_CTS)) )
#define is_probe_resp(__fc) \
	( !!((((__fc) & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) && \
	     (((__fc) & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PROBE_RESP)) )

/*
 * Interval defines
 */
#define LINK_TUNE_INTERVAL	( round_jiffies(HZ) )
#define RFKILL_POLL_INTERVAL	( HZ / 4 )

/*
 * TX result flags.
 */
enum TX_STATUS {
	TX_SUCCESS = 0,
	TX_SUCCESS_RETRY = 1,
	TX_FAIL_RETRY = 2,
	TX_FAIL_INVALID = 3,
	TX_FAIL_OTHER = 4,
};

/*
 * Antenna values
 */
enum antenna {
	ANTENNA_DIVERSITY = 0,
	ANTENNA_A = 1,
	ANTENNA_B = 2,
};

/*
 * Led mode values.
 */
enum led_mode {
	LED_MODE_DEFAULT = 0,
	LED_MODE_TXRX_ACTIVITY = 1,
	LED_MODE_SIGNAL_STRENGTH = 2,
	LED_MODE_ASUS = 3,
	LED_MODE_ALPHA = 4,
};

/*
 * Device states
 */
enum dev_state {
	STATE_DEEP_SLEEP = 0,
	STATE_SLEEP = 1,
	STATE_STANDBY = 2,
	STATE_AWAKE = 3,

/*
 * Additional device states, these values are
 * not strict since they are not directly passed
 * into the device.
 */
	STATE_RADIO_ON,
	STATE_RADIO_OFF,
	STATE_RADIO_RX_ON,
	STATE_RADIO_RX_OFF,
};

/*
 * IFS backoff values
 */
enum ifs {
	IFS_BACKOFF = 0,
	IFS_SIFS = 1,
	IFS_NEW_BACKOFF = 2,
	IFS_NONE = 3,
};

/*
 * Cipher types for hardware encryption
 */
enum cipher {
	CIPHER_NONE = 0,
	CIPHER_WEP64 = 1,
	CIPHER_WEP128 = 2,
	CIPHER_TKIP = 3,
	CIPHER_AES = 4,
/*
 * The following fields were added by rt61pci and rt73usb.
 */
	CIPHER_CKIP64 = 5,
	CIPHER_CKIP128 = 6,
	CIPHER_TKIP_NO_MIC = 7,
};

/*
 * Register handlers.
 * We store the position of a register field inside a field structure,
 * This will simplify the process of setting and reading a certain field
 * inside the register while making sure the process remains byte order safe.
 */
struct rt2x00_field8 {
	u8 bit_offset;
	u8 bit_mask;
};

struct rt2x00_field16 {
	u16 bit_offset;
	u16 bit_mask;
};

struct rt2x00_field32 {
	u32 bit_offset;
	u32 bit_mask;
};

/*
 * Power of two check from Linus Torvalds,
 * this will check if the mask that has been
 * given contains and contiguous set of bits.
 */
#define is_power_of_two(x)	( !((x) & ((x)-1)) )
#define low_bit_mask(x)		( ((x)-1) & ~(x) )
#define is_valid_mask(x)	is_power_of_two(1 + (x) + low_bit_mask(x))

#define FIELD8(__mask)				\
({						\
	BUILD_BUG_ON(!(__mask) ||		\
		     !is_valid_mask(__mask) ||	\
		     (__mask) != (u8)(__mask));	\
	(struct rt2x00_field8) {		\
		__ffs(__mask), (__mask)		\
	};					\
})

#define FIELD16(__mask)				\
({						\
	BUILD_BUG_ON(!(__mask) ||		\
		     !is_valid_mask(__mask) ||	\
		     (__mask) != (u16)(__mask));\
	(struct rt2x00_field16) {		\
		__ffs(__mask), (__mask)		\
	};					\
})

#define FIELD32(__mask)				\
({						\
	BUILD_BUG_ON(!(__mask) ||		\
		     !is_valid_mask(__mask) ||	\
		     (__mask) != (u32)(__mask));\
	(struct rt2x00_field32) {		\
		__ffs(__mask), (__mask)		\
	};					\
})

static inline void rt2x00_set_field32(u32 *reg,
	const struct rt2x00_field32 field, const u32 value)
{
	*reg &= ~(field.bit_mask);
	*reg |= (value << field.bit_offset) & field.bit_mask;
}

static inline u32 rt2x00_get_field32(const u32 reg,
	const struct rt2x00_field32 field)
{
	return (reg & field.bit_mask) >> field.bit_offset;
}

static inline void rt2x00_set_field16(u16 *reg,
	const struct rt2x00_field16 field, const u16 value)
{
	*reg &= ~(field.bit_mask);
	*reg |= (value << field.bit_offset) & field.bit_mask;
}

static inline u16 rt2x00_get_field16(const u16 reg,
	const struct rt2x00_field16 field)
{
	return (reg & field.bit_mask) >> field.bit_offset;
}

static inline void rt2x00_set_field8(u8 *reg,
	const struct rt2x00_field8 field, const u8 value)
{
	*reg &= ~(field.bit_mask);
	*reg |= (value << field.bit_offset) & field.bit_mask;
}

static inline u8 rt2x00_get_field8(const u8 reg,
	const struct rt2x00_field8 field)
{
	return (reg & field.bit_mask) >> field.bit_offset;
}

/*
 * Chipset identification
 * The chipset on the device is composed of a RT and RF chip.
 * The chipset combination is important for determining device capabilities.
 */
struct rt2x00_chip {
	u16 rt;
#define RT2460		0x0101
#define RT2560		0x0201
#define RT2570		0x1201
#define RT2561		0x0301
#define RT2561s		0x0302
#define RT2661		0x0401
#define RT2571		0x1300

	u16 rf;
	u32 rev;
};

/*
 * data_desc
 * Each data entry also contains a descriptor which is used by the
 * device to determine what should be done with the packet and
 * what the current status is.
 * This structure is greatly simplified, but the descriptors
 * are basically a list of little endian 32 bit values.
 * Make the array by default 1 word big, this will allow us
 * to use sizeof() correctly.
 */
struct data_desc {
	__le32 word[1];
};

/*
 * data_entry_desc
 * Summary of information that should be written into the
 * descriptor for sending a TX frame.
 */
struct data_entry_desc {
	/*
	 * PLCP values.
	 */
	u16 length_high;
	u16 length_low;
	u16 signal;
	u16 service;

	int queue;
	int ifs;
};

/*
 * data_entry
 * The data ring is a list of data entries.
 * Each entry holds a reference to the descriptor
 * and the data buffer. For TX rings the reference to the
 * sk_buff of the packet being transmitted is also stored here.
 */
struct data_entry {
	/*
	 * Status flags
	 */
	unsigned long flags;
#define ENTRY_OWNER_NIC		1
#define ENTRY_TXDONE		2
#define ENTRY_TXD_RTS_FRAME	3
#define ENTRY_TXD_OFDM_RATE	4
#define ENTRY_TXD_MORE_FRAG	5
#define ENTRY_TXD_REQ_TIMESTAMP	6
#define ENTRY_TXD_REQ_ACK	7

	/*
	 * Ring we belong to.
	 */
	struct data_ring *ring;

	/*
	 * sk_buff for the packet which is being transmitted
	 * in this entry (Only used with TX related rings).
	 */
	struct sk_buff *skb;

	/*
	 * Store a ieee80211_tx_status structure in each
	 * ring entry, this will optimize the txdone
	 * handler.
	 */
	struct ieee80211_tx_status tx_status;

	/*
	 * private pointer specific to driver.
	 */
	void *priv;

	/*
	 * Data address for this entry.
	 */
	void *data_addr;
	dma_addr_t data_dma;
};

/*
 * data_ring
 * Data rings are used by the device to send and receive packets.
 * The data_addr is the base address of the data memory.
 * To determine at which point in the ring we are,
 * have to use the rt2x00_ring_index_*() functions.
 */
struct data_ring {
	/*
	 * Pointer to main rt2x00dev structure where this
	 * ring belongs to.
	 */
	struct rt2x00_dev *rt2x00dev;

	/*
	 * Base address for the device specific data entries.
	 */
	struct data_entry *entry;

	/*
	 * TX queue statistic info.
	 */
	struct ieee80211_tx_queue_stats_data stats;

	/*
	 * TX Queue parameters.
	 */
	struct ieee80211_tx_queue_params tx_params;

	/*
	 * Base address for data ring.
	 */
	dma_addr_t data_dma;
	void *data_addr;

	/*
	 * Index variables.
	 */
	u16 index;
	u16 index_done;

	/*
	 * Size of packet and descriptor in bytes.
	 */
	u16 data_size;
	u16 desc_size;
};

/*
 * Handlers to determine the address of the current device specific
 * data entry, where either index or index_done points to.
 */
static inline struct data_entry* rt2x00_get_data_entry(
	struct data_ring *ring)
{
	return &ring->entry[ring->index];
}

static inline struct data_entry* rt2x00_get_data_entry_done(
	struct data_ring *ring)
{
	return &ring->entry[ring->index_done];
}

/*
 * Total ring memory
 */
static inline int rt2x00_get_ring_size(struct data_ring *ring)
{
	return ring->stats.limit * (ring->desc_size + ring->data_size);
}

/*
 * Ring index manipulation functions.
 */
static inline void rt2x00_ring_index_inc(struct data_ring *ring)
{
	ring->index++;
	if (ring->index >= ring->stats.limit)
		ring->index = 0;
	ring->stats.len++;
}

static inline void rt2x00_ring_index_done_inc(struct data_ring *ring)
{
	ring->index_done++;
	if (ring->index_done >= ring->stats.limit)
		ring->index_done = 0;
	ring->stats.len--;
	ring->stats.count++;
}

static inline void rt2x00_ring_index_clear(struct data_ring *ring)
{
	ring->index = 0;
	ring->index_done = 0;
	ring->stats.len = 0;
	ring->stats.count = 0;
}

static inline int rt2x00_ring_empty(struct data_ring *ring)
{
	return ring->stats.len == 0;
}

static inline int rt2x00_ring_full(struct data_ring *ring)
{
	return ring->stats.len == ring->stats.limit;
}

static inline int rt2x00_ring_free(struct data_ring *ring)
{
	if (ring->index_done >= ring->index)
		return ring->index_done - ring->index;
	return ring->stats.len - (ring->index - ring->index_done);
}

/*
 * TX/RX Descriptor access functions.
 */
static inline void rt2x00_desc_read(struct data_desc *desc,
	const u8 word, u32 *value)
{
	*value = le32_to_cpu(desc->word[word]);
}

static inline void rt2x00_desc_write(struct data_desc *desc,
	const u8 word, const u32 value)
{
	desc->word[word] = cpu_to_le32(value);
}

/*
 * To optimize the quality of the link we need to store
 * the quality of received frames and periodically
 * optimize the link.
 */
struct link {
	/*
	 * Link tuner counter
	 * The number of times the link has been tuned
	 * since the radio has been switched on.
	 */
	u32 count;

	/*
	 * Misc statistics.
	 * For the average RSSI value we use the "Walking average" approach.
	 * When adding RSSI to the average value the following calculation
	 * is needed:
	 *
	 * 	avg_rssi = ((avg_rssi * 7) + rssi) / 8;
	 *
	 * The advantage of this approach is that we only need 1 variable
	 * to store the average in (No need for a count and a total).
	 * But more importantly, normal average values will over time
	 * move less and less towards newly added values.
	 * This means that with link tuning, the device can have a very
	 * good RSSI for a few minutes but when the device is moved away
	 * from the AP the average will not decrease fast enough to
	 * compensate. The walking average compensates this and will
	 * move towards the new values correctly.
	 */
	int avg_rssi;
	int false_cca;

	/*
	 * Work structure for scheduling periodic link tuning.
	 */
	struct delayed_work work;
};

/*
 * Interface structure
 * Configuration details about the current interface.
 */
struct interface {
	/*
	 * Interface identification. The value is assigned
	 * to us by the 80211 stack, and is used to request
	 * new beacons.
	 */
	int id;

	/*
	 * Current working type (IEEE80211_IF_TYPE_*).
	 * This excludes the type IEEE80211_IF_TYPE_MNTR
	 * since that is counted seperately in the monitor_count
	 * field.
	 */
	int type;

	/*
	 * BBSID of the AP to associate with.
	 */
	u8 bssid[ETH_ALEN];

	/*
	 * Store the promisc mode for the current interface.
	 * monitor mode always forces promisc mode to be enabled,
	 * so we need to store the promisc mode seperately.
	 */
	short promisc;

	/*
	 * Monitor mode count, the number of interfaces
	 * in monitor mode that that have been added.
	 */
	short monitor_count;
};

static inline int is_interface_present(struct interface *intf)
{
	return !!intf->id;
}

static inline int is_monitor_present(struct interface *intf)
{
	return !!intf->monitor_count;
}

/*
 * Details about the supported modes, rates and channels
 * of a particular chipset. This is used by rt2x00lib
 * to build the ieee80211_hw_mode array for mac80211.
 */
struct hw_mode_spec {
	/*
	 * Number of modes, rates and channels.
	 */
	int num_modes;
	int num_rates;
	int num_channels;

	/*
	 * txpower values.
	 */
	const u8 *tx_power_a;
	const u8 *tx_power_bg;
	u8 tx_power_default;

	/*
	 * Device/chipset specific value.
	 */
	const u32 *chan_val_a;
	const u32 *chan_val_bg;
};

/*
 * rt2x00lib callback functions.
 */
struct rt2x00lib_ops {
	/*
	 * Interrupt handlers.
	 */
	irq_handler_t irq_handler;

	/*
	 * Device init handlers.
	 */
	int (*init_hw)(struct rt2x00_dev *rt2x00dev);
	char* (*get_fw_name)(struct rt2x00_dev *rt2x00dev);
	int (*load_firmware)(struct rt2x00_dev *rt2x00dev, void *data,
		const size_t len);

	/*
	 * Device initialization/deinitialization handlers.
	 */
	int (*initialize)(struct rt2x00_dev *rt2x00dev);
	void (*uninitialize)(struct rt2x00_dev *rt2x00dev);

	/*
	 * Radio control handlers.
	 */
	int (*set_device_state)(struct rt2x00_dev *rt2x00dev,
		enum dev_state state);
	int (*rfkill_poll)(struct rt2x00_dev *rt2x00dev);
	void (*link_tuner)(struct rt2x00_dev *rt2x00dev);

	/*
	 * TX control handlers
	 */
	void (*write_tx_desc)(struct rt2x00_dev *rt2x00dev,
		struct data_entry *entry, struct data_desc *txd,
		struct data_entry_desc *desc,
		struct ieee80211_hdr *ieee80211hdr, unsigned int length,
		struct ieee80211_tx_control *control);
	int (*write_tx_data)(struct rt2x00_dev *rt2x00dev,
		struct data_ring *ring, struct sk_buff *skb,
		struct ieee80211_tx_control *control);
	void (*kick_tx_queue)(struct rt2x00_dev *rt2x00dev, int queue);

	/*
	 * RX control handlers
	 */
	int (*fill_rxdone)(struct data_entry *entry,
		int *signal, int *rssi, int *ofdm);

	/*
	 * Configuration handlers.
	 */
	void (*config_type)(struct rt2x00_dev *rt2x00dev, const int type);
	void (*config_phymode)(struct rt2x00_dev *rt2x00dev, const int phy);
	void (*config_channel)(struct rt2x00_dev *rt2x00dev, const int value,
		const int channel, const int txpower);
	void (*config_mac_addr)(struct rt2x00_dev *rt2x00dev, u8 *mac);
	void (*config_bssid)(struct rt2x00_dev *rt2x00dev, u8 *bssid);
	void (*config_promisc)(struct rt2x00_dev *rt2x00dev, const int promisc);
	void (*config_txpower)(struct rt2x00_dev *rt2x00dev, const int txpower);
	void (*config_antenna)(struct rt2x00_dev *rt2x00dev,
		const int antenna_tx, const int antenna_rx);
	void (*config_duration)(struct rt2x00_dev *rt2x00dev,
		const int short_slot_time, const int beacon_int);
};

/*
 * rt2x00 driver callback operation structure.
 */
struct rt2x00_ops {
	const char *name;
	const unsigned int rxd_size;
	const unsigned int txd_size;
	const struct rt2x00lib_ops *lib;
	const struct ieee80211_ops *hw;
#ifdef CONFIG_RT2X00_LIB_DEBUGFS
	const struct rt2x00debug *debugfs;
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */
};

/*
 * rt2x00 device structure.
 */
struct rt2x00_dev {
	/*
	 * Device structure.
	 * The structure stored in here depends on the
	 * system bus (PCI or USB).
	 * When accessing this variable, the rt2x00dev_{pci,usb}
	 * macro's should be used for correct typecasting.
	 */
	void *dev;
#define rt2x00dev_pci(__dev)	( (struct pci_dev*)(__dev)->dev )
#define rt2x00dev_usb(__dev)	( (struct usb_interface*)(__dev)->dev )

	/*
	 * Callback functions.
	 */
	const struct rt2x00_ops *ops;

	/*
	 * IEEE80211 control structure.
	 */
	struct ieee80211_hw *hw;
	struct ieee80211_hw_mode *hwmodes;
	unsigned int curr_hwmode;
#define HWMODE_B	0
#define HWMODE_G	1
#define HWMODE_A	2

	/*
	 * rfkill structure for RF state switching support.
	 * This will only be compiled in when required.
	 */
#ifdef CONFIG_RT2X00_LIB_RFKILL
	struct rfkill *rfkill;
	struct delayed_work rfkill_work;
#endif /* CONFIG_RT2X00_LIB_RFKILL */

	/*
	 * Device flags.
	 * In these flags the current status and some
	 * of the device capabilities are stored.
	 */
	unsigned long flags;
#define DEVICE_ENABLED_RADIO		1
#define DEVICE_ENABLED_RADIO_HW		2
#define DEVICE_INITIALIZED		3
#define DEVICE_INITIALIZED_HW		4
#define FIRMWARE_REQUIRED		5
#define FIRMWARE_LOADED			6
#define FIRMWARE_FAILED			7
#define INTERFACE_ENABLED		8
#define INTERFACE_ENABLED_MONITOR	9
#define INTERFACE_ENABLED_PROMISC	10
#define DEVICE_SUPPORT_ATIM		11
#define DEVICE_SUPPORT_HW_BUTTON	12
#define CONFIG_FRAME_TYPE		13
#define CONFIG_RF_SEQUENCE		14
#define CONFIG_EXTERNAL_LNA		15
#define CONFIG_EXTERNAL_LNA_A		16
#define CONFIG_EXTERNAL_LNA_BG		17
#define CONFIG_DOUBLE_ANTENNA		18
#define CONFIG_DISABLE_LINK_TUNING	19

	/*
	 * Chipset identification.
	 */
	struct rt2x00_chip chip;

	/*
	 * hw capability specifications.
	 */
	struct hw_mode_spec spec;

	/*
	 * Base address of device registers (PCI devices only).
	 */
	void __iomem *csr_addr;

	/*
	 * If enabled, the debugfs interface structures
	 * required for deregistration of debugfs.
	 */
#ifdef CONFIG_RT2X00_LIB_DEBUGFS
	const struct rt2x00debug_intf *debugfs_intf;
#endif /* CONFIG_RT2X00_LIB_DEBUGFS */

	/*
	 * Interface configuration.
	 */
	struct interface interface;

	/*
	 * Link quality
	 */
	struct link link;

	/*
	 * EEPROM data.
	 */
	__le16 *eeprom;

	/*
	 * Active RF register values.
	 * These are stored here for easier working
	 * with the rf registers.
	 */
	u32 rf1;
	u32 rf2;
	u32 rf3;
	u32 rf4;

	/*
	 * Current TX power value.
	 */
	u16 tx_power;

	/*
	 * LED register (for rt61pci & rt73usb).
	 */
	u16 led_reg;

	/*
	 * Led mode (LED_MODE_*)
	 */
	u8 led_mode;

	/*
	 * Rssi <-> Dbm offset
	 */
	u8 rssi_offset;

	/*
	 * Frequency offset (for rt61pci & rt73usb).
	 */
	u8 freq_offset;

	/*
	 * Low level statistics which will have
	 * to be kept up to date while device is running.
	 */
	struct ieee80211_low_level_stats low_level_stats;

	/*
	 * RX configuration information.
	 */
	struct ieee80211_rx_status rx_status;

	/*
	 * Data ring arrays for RX, TX and Beacon.
	 * The Beacon array also contains the Atim ring
	 * if that is supported by the device.
	 */
	struct data_ring *rx;
	struct data_ring *tx;
	struct data_ring *bcn;
};

static inline struct data_ring* rt2x00_get_ring(
	struct rt2x00_dev *rt2x00dev, const unsigned int queue)
{
	int atim = test_bit(DEVICE_SUPPORT_ATIM, &rt2x00dev->flags);

	/*
	 * Check if the rings have been allocated.
	 */
	if (!rt2x00dev->tx || !rt2x00dev->bcn)
		return NULL;

	/*
	 * Check if we are requesting a reqular TX ring,
	 * or if we are requesting a Beacon or Atim ring.
	 * For Atim rings, we should check if it is supported.
	 */
	if (queue < rt2x00dev->hw->queues)
		return &rt2x00dev->tx[queue];
	else if (queue == IEEE80211_TX_QUEUE_BEACON)
		return &rt2x00dev->bcn[0];
	else if (queue == IEEE80211_TX_QUEUE_AFTER_BEACON && atim)
		return &rt2x00dev->bcn[1];

	return NULL;
}

/*
 * For-each loop for the ring array.
 * Since the all rings are allocated as a single array,
 * we can start at the rx pointer and move forward to the tx rings.
 * The 1 + Atim check will assure that the address directly after
 * the ring array is obtained and the for-each loop exits correctly.
 */
#define ring_end(__dev) \
	&(__dev)->bcn[1 + test_bit(DEVICE_SUPPORT_ATIM, &rt2x00dev->flags)]

#define ring_loop(__entry, __start, __end)			\
	for ((__entry) = (__start);				\
	     prefetch(&(__entry)[1]), (__entry) != (__end);	\
	     (__entry) = &(__entry)[1])

#define ring_for_each(__dev, __entry) \
	ring_loop(__entry, (__dev)->rx, ring_end(__dev))

#define txring_for_each(__dev, __entry) \
	ring_loop(__entry, (__dev)->tx, (__dev)->bcn)

#define txringall_for_each(__dev, __entry) \
	ring_loop(__entry, (__dev)->tx, ring_end(__dev))

/*
 * EEPROM access.
 * The EEPROM is being accessed by word index.
 */
static inline void* rt2x00_eeprom_addr(const struct rt2x00_dev *rt2x00dev,
	const u8 word)
{
	return (void*)&rt2x00dev->eeprom[word];
}

static inline void rt2x00_eeprom_read(const struct rt2x00_dev *rt2x00dev,
	const u8 word, u16 *data)
{
	*data = le16_to_cpu(rt2x00dev->eeprom[word]);
}

static inline void rt2x00_eeprom_write(const struct rt2x00_dev *rt2x00dev,
	const u8 word, u16 data)
{
	rt2x00dev->eeprom[word] = cpu_to_le16(data);
}

/*
 * Link tuning handlers
 */
static inline void rt2x00_start_link_tune(struct rt2x00_dev *rt2x00dev)
{
	rt2x00dev->link.count = 0;
	rt2x00dev->link.avg_rssi = 0;
	rt2x00dev->link.false_cca = 0;

	queue_delayed_work(rt2x00dev->hw->workqueue,
		&rt2x00dev->link.work, LINK_TUNE_INTERVAL);
}

static inline void rt2x00_stop_link_tune(struct rt2x00_dev *rt2x00dev)
{
	if (work_pending(&rt2x00dev->link.work.work))
		cancel_rearming_delayed_workqueue(
			rt2x00dev->hw->workqueue, &rt2x00dev->link.work);
}

static inline void rt2x00_update_link_rssi(struct link *link, int rssi)
{
	if (!link->avg_rssi)
		link->avg_rssi = rssi;
	else
		link->avg_rssi = ((link->avg_rssi * 7) + rssi) / 8;
}

static inline int rt2x00_get_link_rssi(struct link *link)
{
	return link->avg_rssi;
}

/*
 * Chipset handlers
 */
static inline void rt2x00_set_chip(struct rt2x00_dev *rt2x00dev,
	const u16 rt, const u16 rf, const u32 rev)
{
	INFO(rt2x00dev,
		"Chipset detected - rt: %04x, rf: %04x, rev: %08x.\n",
		rt, rf, rev);

	rt2x00dev->chip.rt = rt;
	rt2x00dev->chip.rf = rf;
	rt2x00dev->chip.rev = rev;
}

static inline char rt2x00_rt(const struct rt2x00_chip *chipset, const u16 chip)
{
	return (chipset->rt == chip);
}

static inline char rt2x00_rf(const struct rt2x00_chip *chipset, const u16 chip)
{
	return (chipset->rf == chip);
}

static inline u16 rt2x00_rev(const struct rt2x00_chip *chipset)
{
	return chipset->rev;
}

/*
 * Device specific rate value.
 * We will have to create the device specific rate value
 * passed to the ieee80211 kernel. We need to make it a consist of
 * multiple fields because we want to store more then 1 device specific
 * values inside the value.
 *	1 - rate, stored as 100 kbit/s.
 *	2 - preamble, short_preamble enabled flag.
 *	3 - MASK_RATE, which rates are enabled in this mode, this mask
 *	corresponds with the TX register format for the current device.
 *	4 - plcp, 802.11b rates are device specific,
 *	802.11g rates are set according to the ieee802.11a-1999 p.14.
 * The bit to enable preamble is set in a seperate define.
 */
#define DEV_RATE	FIELD32(0x000007ff)
#define DEV_PREAMBLE	FIELD32(0x00000800)
#define DEV_RATEMASK	FIELD32(0x00fff000)
#define DEV_PLCP	FIELD32(0xff000000)

/*
 * Bitmask for MASK_RATE
 */
#define DEV_RATE_1MB	0x00000001
#define DEV_RATE_2MB	0x00000002
#define DEV_RATE_5_5MB	0x00000004
#define DEV_RATE_11MB	0x00000008
#define DEV_RATE_6MB	0x00000010
#define DEV_RATE_9MB	0x00000020
#define DEV_RATE_12MB	0x00000040
#define DEV_RATE_18MB	0x00000080
#define DEV_RATE_24MB	0x00000100
#define DEV_RATE_36MB	0x00000200
#define DEV_RATE_48MB	0x00000400
#define DEV_RATE_54MB	0x00000800

/*
 * Bitmask groups of bitrates
 */
#define DEV_BASIC_RATE \
	( DEV_RATE_1MB | DEV_RATE_2MB | DEV_RATE_5_5MB | DEV_RATE_11MB | \
	  DEV_RATE_6MB | DEV_RATE_12MB | DEV_RATE_24MB )

#define DEV_CCK_RATE \
	( DEV_RATE_1MB | DEV_RATE_2MB | DEV_RATE_5_5MB | DEV_RATE_11MB )

#define DEV_OFDM_RATE \
	( DEV_RATE_6MB | DEV_RATE_9MB | DEV_RATE_12MB | DEV_RATE_18MB | \
	  DEV_RATE_24MB | DEV_RATE_36MB | DEV_RATE_48MB | DEV_RATE_54MB )

/*
 * Macro's to set and get specific fields from the device specific val and val2
 * fields inside the ieee80211_rate entry.
 */
#define DEVICE_SET_RATE_FIELD(__value, __mask) \
	(int)( ((__value) << DEV_##__mask.bit_offset) & DEV_##__mask.bit_mask )

#define DEVICE_GET_RATE_FIELD(__value, __mask) \
	(int)( ((__value) & DEV_##__mask.bit_mask) >> DEV_##__mask.bit_offset )

/*
 * Duration calculations
 * The rate variable passed is: 100kbs.
 * To convert from bytes to bits we multiply size with 8,
 * then the size is multiplied with 10 to make the
 * real rate -> rate argument correction.
 */
static inline u16 get_duration(const unsigned int size, const u8 rate)
{
	return ((size * 8 * 10) / rate);
}

static inline u16 get_duration_res(const unsigned int size, const u8 rate)
{
	return ((size * 8 * 10) % rate);
}

#endif /* RT2X00_H */