summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/net/wireless/ath/regd.c
blob: 06ea6cc9e30a5e07c379116a8e1ec0996e3f189e (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
/*
 * Copyright (c) 2008-2009 Atheros Communications Inc.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/export.h>
#include <net/cfg80211.h>
#include <net/mac80211.h>
#include "regd.h"
#include "regd_common.h"

static int __ath_regd_init(struct ath_regulatory *reg);

/*
 * This is a set of common rules used by our world regulatory domains.
 * We have 12 world regulatory domains. To save space we consolidate
 * the regulatory domains in 5 structures by frequency and change
 * the flags on our reg_notifier() on a case by case basis.
 */

/* Only these channels all allow active scan on all world regulatory domains */
#define ATH9K_2GHZ_CH01_11	REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)

/* We enable active scan on these a case by case basis by regulatory domain */
#define ATH9K_2GHZ_CH12_13	REG_RULE(2467-10, 2472+10, 40, 0, 20,\
					 NL80211_RRF_NO_IR)
#define ATH9K_2GHZ_CH14		REG_RULE(2484-10, 2484+10, 40, 0, 20,\
					 NL80211_RRF_NO_IR | \
					 NL80211_RRF_NO_OFDM)

/* We allow IBSS on these on a case by case basis by regulatory domain */
#define ATH9K_5GHZ_5150_5350	REG_RULE(5150-10, 5350+10, 80, 0, 30,\
					 NL80211_RRF_NO_IR)
#define ATH9K_5GHZ_5470_5850	REG_RULE(5470-10, 5850+10, 80, 0, 30,\
					 NL80211_RRF_NO_IR)
#define ATH9K_5GHZ_5725_5850	REG_RULE(5725-10, 5850+10, 80, 0, 30,\
					 NL80211_RRF_NO_IR)

#define ATH9K_2GHZ_ALL		ATH9K_2GHZ_CH01_11, \
				ATH9K_2GHZ_CH12_13, \
				ATH9K_2GHZ_CH14

#define ATH9K_5GHZ_ALL		ATH9K_5GHZ_5150_5350, \
				ATH9K_5GHZ_5470_5850

/* This one skips what we call "mid band" */
#define ATH9K_5GHZ_NO_MIDBAND	ATH9K_5GHZ_5150_5350, \
				ATH9K_5GHZ_5725_5850

/* Can be used for:
 * 0x60, 0x61, 0x62 */
static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
	.n_reg_rules = 5,
	.alpha2 =  "99",
	.reg_rules = {
		ATH9K_2GHZ_ALL,
		ATH9K_5GHZ_ALL,
	}
};

/* Can be used by 0x63 and 0x65 */
static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
	.n_reg_rules = 4,
	.alpha2 =  "99",
	.reg_rules = {
		ATH9K_2GHZ_CH01_11,
		ATH9K_2GHZ_CH12_13,
		ATH9K_5GHZ_NO_MIDBAND,
	}
};

/* Can be used by 0x64 only */
static const struct ieee80211_regdomain ath_world_regdom_64 = {
	.n_reg_rules = 3,
	.alpha2 =  "99",
	.reg_rules = {
		ATH9K_2GHZ_CH01_11,
		ATH9K_5GHZ_NO_MIDBAND,
	}
};

/* Can be used by 0x66 and 0x69 */
static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
	.n_reg_rules = 3,
	.alpha2 =  "99",
	.reg_rules = {
		ATH9K_2GHZ_CH01_11,
		ATH9K_5GHZ_ALL,
	}
};

/* Can be used by 0x67, 0x68, 0x6A and 0x6C */
static const struct ieee80211_regdomain ath_world_regdom_67_68_6A_6C = {
	.n_reg_rules = 4,
	.alpha2 =  "99",
	.reg_rules = {
		ATH9K_2GHZ_CH01_11,
		ATH9K_2GHZ_CH12_13,
		ATH9K_5GHZ_ALL,
	}
};

static bool dynamic_country_user_possible(struct ath_regulatory *reg)
{
	if (config_enabled(CONFIG_ATH_REG_DYNAMIC_USER_CERT_TESTING))
		return true;

	switch (reg->country_code) {
	case CTRY_UNITED_STATES:
	case CTRY_JAPAN1:
	case CTRY_JAPAN2:
	case CTRY_JAPAN3:
	case CTRY_JAPAN4:
	case CTRY_JAPAN5:
	case CTRY_JAPAN6:
	case CTRY_JAPAN7:
	case CTRY_JAPAN8:
	case CTRY_JAPAN9:
	case CTRY_JAPAN10:
	case CTRY_JAPAN11:
	case CTRY_JAPAN12:
	case CTRY_JAPAN13:
	case CTRY_JAPAN14:
	case CTRY_JAPAN15:
	case CTRY_JAPAN16:
	case CTRY_JAPAN17:
	case CTRY_JAPAN18:
	case CTRY_JAPAN19:
	case CTRY_JAPAN20:
	case CTRY_JAPAN21:
	case CTRY_JAPAN22:
	case CTRY_JAPAN23:
	case CTRY_JAPAN24:
	case CTRY_JAPAN25:
	case CTRY_JAPAN26:
	case CTRY_JAPAN27:
	case CTRY_JAPAN28:
	case CTRY_JAPAN29:
	case CTRY_JAPAN30:
	case CTRY_JAPAN31:
	case CTRY_JAPAN32:
	case CTRY_JAPAN33:
	case CTRY_JAPAN34:
	case CTRY_JAPAN35:
	case CTRY_JAPAN36:
	case CTRY_JAPAN37:
	case CTRY_JAPAN38:
	case CTRY_JAPAN39:
	case CTRY_JAPAN40:
	case CTRY_JAPAN41:
	case CTRY_JAPAN42:
	case CTRY_JAPAN43:
	case CTRY_JAPAN44:
	case CTRY_JAPAN45:
	case CTRY_JAPAN46:
	case CTRY_JAPAN47:
	case CTRY_JAPAN48:
	case CTRY_JAPAN49:
	case CTRY_JAPAN50:
	case CTRY_JAPAN51:
	case CTRY_JAPAN52:
	case CTRY_JAPAN53:
	case CTRY_JAPAN54:
	case CTRY_JAPAN55:
	case CTRY_JAPAN56:
	case CTRY_JAPAN57:
	case CTRY_JAPAN58:
	case CTRY_JAPAN59:
		return false;
	}

	return true;
}

static bool ath_reg_dyn_country_user_allow(struct ath_regulatory *reg)
{
	if (!config_enabled(CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS))
		return false;
	if (!dynamic_country_user_possible(reg))
		return false;
	return true;
}

static inline bool is_wwr_sku(u16 regd)
{
	return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) &&
		(((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
		(regd == WORLD));
}

static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
{
	return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
}

bool ath_is_world_regd(struct ath_regulatory *reg)
{
	return is_wwr_sku(ath_regd_get_eepromRD(reg));
}
EXPORT_SYMBOL(ath_is_world_regd);

static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
{
	/* this is the most restrictive */
	return &ath_world_regdom_64;
}

static const struct
ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
{
	switch (reg->regpair->reg_domain) {
	case 0x60:
	case 0x61:
	case 0x62:
		return &ath_world_regdom_60_61_62;
	case 0x63:
	case 0x65:
		return &ath_world_regdom_63_65;
	case 0x64:
		return &ath_world_regdom_64;
	case 0x66:
	case 0x69:
		return &ath_world_regdom_66_69;
	case 0x67:
	case 0x68:
	case 0x6A:
	case 0x6C:
		return &ath_world_regdom_67_68_6A_6C;
	default:
		WARN_ON(1);
		return ath_default_world_regdomain();
	}
}

bool ath_is_49ghz_allowed(u16 regdomain)
{
	/* possibly more */
	return regdomain == MKK9_MKKC;
}
EXPORT_SYMBOL(ath_is_49ghz_allowed);

/* Frequency is one where radar detection is required */
static bool ath_is_radar_freq(u16 center_freq)
{
	return (center_freq >= 5260 && center_freq <= 5700);
}

static void ath_force_clear_no_ir_chan(struct wiphy *wiphy,
				       struct ieee80211_channel *ch)
{
	const struct ieee80211_reg_rule *reg_rule;

	reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(ch->center_freq));
	if (IS_ERR(reg_rule))
		return;

	if (!(reg_rule->flags & NL80211_RRF_NO_IR))
		if (ch->flags & IEEE80211_CHAN_NO_IR)
			ch->flags &= ~IEEE80211_CHAN_NO_IR;
}

static void ath_force_clear_no_ir_freq(struct wiphy *wiphy, u16 center_freq)
{
	struct ieee80211_channel *ch;

	ch = ieee80211_get_channel(wiphy, center_freq);
	if (!ch)
		return;

	ath_force_clear_no_ir_chan(wiphy, ch);
}

static void ath_force_no_ir_chan(struct ieee80211_channel *ch)
{
	ch->flags |= IEEE80211_CHAN_NO_IR;
}

static void ath_force_no_ir_freq(struct wiphy *wiphy, u16 center_freq)
{
	struct ieee80211_channel *ch;

	ch = ieee80211_get_channel(wiphy, center_freq);
	if (!ch)
		return;

	ath_force_no_ir_chan(ch);
}

static void
__ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
				struct ath_regulatory *reg,
				enum nl80211_reg_initiator initiator,
				struct ieee80211_channel *ch)
{
	if (ath_is_radar_freq(ch->center_freq) ||
	    (ch->flags & IEEE80211_CHAN_RADAR))
		return;

	switch (initiator) {
	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
		ath_force_clear_no_ir_chan(wiphy, ch);
		break;
	case NL80211_REGDOM_SET_BY_USER:
		if (ath_reg_dyn_country_user_allow(reg))
			ath_force_clear_no_ir_chan(wiphy, ch);
		break;
	default:
		if (ch->beacon_found)
			ch->flags &= ~IEEE80211_CHAN_NO_IR;
	}
}

/*
 * These exception rules do not apply radar frequencies.
 *
 * - We enable initiating radiation if the country IE says its fine:
 * - If no country IE has been processed and a we determine we have
 *   received a beacon on a channel we can enable initiating radiation.
 */
static void
ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
			      struct ath_regulatory *reg,
			      enum nl80211_reg_initiator initiator)
{
	enum ieee80211_band band;
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *ch;
	unsigned int i;

	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
		if (!wiphy->bands[band])
			continue;
		sband = wiphy->bands[band];
		for (i = 0; i < sband->n_channels; i++) {
			ch = &sband->channels[i];
			__ath_reg_apply_beaconing_flags(wiphy, reg,
							initiator, ch);
		}
	}
}

/**
 * ath_reg_apply_ir_flags()
 * @wiphy: the wiphy to use
 * @initiator: the regulatory hint initiator
 *
 * If no country IE has been received always enable passive scan
 * and no-ibss on these channels. This is only done for specific
 * regulatory SKUs.
 *
 * If a country IE has been received check its rule for this
 * channel first before enabling active scan. The passive scan
 * would have been enforced by the initial processing of our
 * custom regulatory domain.
 */
static void
ath_reg_apply_ir_flags(struct wiphy *wiphy,
		       struct ath_regulatory *reg,
		       enum nl80211_reg_initiator initiator)
{
	struct ieee80211_supported_band *sband;

	sband = wiphy->bands[IEEE80211_BAND_2GHZ];
	if (!sband)
		return;

	switch(initiator) {
	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
		ath_force_clear_no_ir_freq(wiphy, 2467);
		ath_force_clear_no_ir_freq(wiphy, 2472);
		break;
	case NL80211_REGDOM_SET_BY_USER:
		if (!ath_reg_dyn_country_user_allow(reg))
			break;
		ath_force_clear_no_ir_freq(wiphy, 2467);
		ath_force_clear_no_ir_freq(wiphy, 2472);
		break;
	default:
		ath_force_no_ir_freq(wiphy, 2467);
		ath_force_no_ir_freq(wiphy, 2472);
	}
}

/* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
{
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *ch;
	unsigned int i;

	if (!wiphy->bands[IEEE80211_BAND_5GHZ])
		return;

	sband = wiphy->bands[IEEE80211_BAND_5GHZ];

	for (i = 0; i < sband->n_channels; i++) {
		ch = &sband->channels[i];
		if (!ath_is_radar_freq(ch->center_freq))
			continue;
		/* We always enable radar detection/DFS on this
		 * frequency range. Additionally we also apply on
		 * this frequency range:
		 * - If STA mode does not yet have DFS supports disable
		 *   active scanning
		 * - If adhoc mode does not support DFS yet then
		 *   disable adhoc in the frequency.
		 * - If AP mode does not yet support radar detection/DFS
		 *   do not allow AP mode
		 */
		if (!(ch->flags & IEEE80211_CHAN_DISABLED))
			ch->flags |= IEEE80211_CHAN_RADAR |
				     IEEE80211_CHAN_NO_IR;
	}
}

static void ath_reg_apply_world_flags(struct wiphy *wiphy,
				      enum nl80211_reg_initiator initiator,
				      struct ath_regulatory *reg)
{
	switch (reg->regpair->reg_domain) {
	case 0x60:
	case 0x63:
	case 0x66:
	case 0x67:
	case 0x6C:
		ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
		break;
	case 0x68:
		ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
		ath_reg_apply_ir_flags(wiphy, reg, initiator);
		break;
	default:
		if (ath_reg_dyn_country_user_allow(reg))
			ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
	}
}

static u16 ath_regd_find_country_by_name(char *alpha2)
{
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
		if (!memcmp(allCountries[i].isoName, alpha2, 2))
			return allCountries[i].countryCode;
	}

	return -1;
}

static int __ath_reg_dyn_country(struct wiphy *wiphy,
				 struct ath_regulatory *reg,
				 struct regulatory_request *request)
{
	u16 country_code;

	if (request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
	    !ath_is_world_regd(reg))
		return -EINVAL;

	country_code = ath_regd_find_country_by_name(request->alpha2);
	if (country_code == (u16) -1)
		return -EINVAL;

	reg->current_rd = COUNTRY_ERD_FLAG;
	reg->current_rd |= country_code;

	__ath_regd_init(reg);

	ath_reg_apply_world_flags(wiphy, request->initiator, reg);

	return 0;
}

static void ath_reg_dyn_country(struct wiphy *wiphy,
				struct ath_regulatory *reg,
				struct regulatory_request *request)
{
	if (__ath_reg_dyn_country(wiphy, reg, request))
		return;

	printk(KERN_DEBUG "ath: regdomain 0x%0x "
			  "dynamically updated by %s\n",
	       reg->current_rd,
	       reg_initiator_name(request->initiator));
}

void ath_reg_notifier_apply(struct wiphy *wiphy,
			    struct regulatory_request *request,
			    struct ath_regulatory *reg)
{
	struct ath_common *common = container_of(reg, struct ath_common,
						 regulatory);
	/* We always apply this */
	ath_reg_apply_radar_flags(wiphy);

	/*
	 * This would happen when we have sent a custom regulatory request
	 * a world regulatory domain and the scheduler hasn't yet processed
	 * any pending requests in the queue.
	 */
	if (!request)
		return;

	reg->region = request->dfs_region;
	switch (request->initiator) {
	case NL80211_REGDOM_SET_BY_CORE:
		/*
		 * If common->reg_world_copy is world roaming it means we *were*
		 * world roaming... so we now have to restore that data.
		 */
		if (!ath_is_world_regd(&common->reg_world_copy))
			break;

		memcpy(reg, &common->reg_world_copy,
		       sizeof(struct ath_regulatory));
		break;
	case NL80211_REGDOM_SET_BY_DRIVER:
		break;
	case NL80211_REGDOM_SET_BY_USER:
		if (ath_reg_dyn_country_user_allow(reg))
			ath_reg_dyn_country(wiphy, reg, request);
		break;
	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
		ath_reg_dyn_country(wiphy, reg, request);
		break;
	}
}
EXPORT_SYMBOL(ath_reg_notifier_apply);

static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
{
	u16 rd = ath_regd_get_eepromRD(reg);
	int i;

	if (rd & COUNTRY_ERD_FLAG) {
		/* EEPROM value is a country code */
		u16 cc = rd & ~COUNTRY_ERD_FLAG;
		printk(KERN_DEBUG
		       "ath: EEPROM indicates we should expect "
			"a country code\n");
		for (i = 0; i < ARRAY_SIZE(allCountries); i++)
			if (allCountries[i].countryCode == cc)
				return true;
	} else {
		/* EEPROM value is a regpair value */
		if (rd != CTRY_DEFAULT)
			printk(KERN_DEBUG "ath: EEPROM indicates we "
			       "should expect a direct regpair map\n");
		for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
			if (regDomainPairs[i].reg_domain == rd)
				return true;
	}
	printk(KERN_DEBUG
		 "ath: invalid regulatory domain/country code 0x%x\n", rd);
	return false;
}

/* EEPROM country code to regpair mapping */
static struct country_code_to_enum_rd*
ath_regd_find_country(u16 countryCode)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
		if (allCountries[i].countryCode == countryCode)
			return &allCountries[i];
	}
	return NULL;
}

/* EEPROM rd code to regpair mapping */
static struct country_code_to_enum_rd*
ath_regd_find_country_by_rd(int regdmn)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
		if (allCountries[i].regDmnEnum == regdmn)
			return &allCountries[i];
	}
	return NULL;
}

/* Returns the map of the EEPROM set RD to a country code */
static u16 ath_regd_get_default_country(u16 rd)
{
	if (rd & COUNTRY_ERD_FLAG) {
		struct country_code_to_enum_rd *country = NULL;
		u16 cc = rd & ~COUNTRY_ERD_FLAG;

		country = ath_regd_find_country(cc);
		if (country != NULL)
			return cc;
	}

	return CTRY_DEFAULT;
}

static struct reg_dmn_pair_mapping*
ath_get_regpair(int regdmn)
{
	int i;

	if (regdmn == NO_ENUMRD)
		return NULL;
	for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
		if (regDomainPairs[i].reg_domain == regdmn)
			return &regDomainPairs[i];
	}
	return NULL;
}

static int
ath_regd_init_wiphy(struct ath_regulatory *reg,
		    struct wiphy *wiphy,
		    void (*reg_notifier)(struct wiphy *wiphy,
					 struct regulatory_request *request))
{
	const struct ieee80211_regdomain *regd;

	wiphy->reg_notifier = reg_notifier;
	wiphy->regulatory_flags |= REGULATORY_STRICT_REG |
				   REGULATORY_CUSTOM_REG;

	if (ath_is_world_regd(reg)) {
		/*
		 * Anything applied here (prior to wiphy registration) gets
		 * saved on the wiphy orig_* parameters
		 */
		regd = ath_world_regdomain(reg);
		wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_FOLLOW_POWER;
	} else {
		/*
		 * This gets applied in the case of the absence of CRDA,
		 * it's our own custom world regulatory domain, similar to
		 * cfg80211's but we enable passive scanning.
		 */
		regd = ath_default_world_regdomain();
	}

	wiphy_apply_custom_regulatory(wiphy, regd);
	ath_reg_apply_radar_flags(wiphy);
	ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
	return 0;
}

/*
 * Some users have reported their EEPROM programmed with
 * 0x8000 set, this is not a supported regulatory domain
 * but since we have more than one user with it we need
 * a solution for them. We default to 0x64, which is the
 * default Atheros world regulatory domain.
 */
static void ath_regd_sanitize(struct ath_regulatory *reg)
{
	if (reg->current_rd != COUNTRY_ERD_FLAG)
		return;
	printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
	reg->current_rd = 0x64;
}

static int __ath_regd_init(struct ath_regulatory *reg)
{
	struct country_code_to_enum_rd *country = NULL;
	u16 regdmn;

	if (!reg)
		return -EINVAL;

	ath_regd_sanitize(reg);

	printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);

	if (!ath_regd_is_eeprom_valid(reg)) {
		pr_err("Invalid EEPROM contents\n");
		return -EINVAL;
	}

	regdmn = ath_regd_get_eepromRD(reg);
	reg->country_code = ath_regd_get_default_country(regdmn);

	if (reg->country_code == CTRY_DEFAULT &&
	    regdmn == CTRY_DEFAULT) {
		printk(KERN_DEBUG "ath: EEPROM indicates default "
		       "country code should be used\n");
		reg->country_code = CTRY_UNITED_STATES;
	}

	if (reg->country_code == CTRY_DEFAULT) {
		country = NULL;
	} else {
		printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
		       "map search\n");
		country = ath_regd_find_country(reg->country_code);
		if (country == NULL) {
			printk(KERN_DEBUG
				"ath: no valid country maps found for "
				"country code: 0x%0x\n",
				reg->country_code);
			return -EINVAL;
		} else {
			regdmn = country->regDmnEnum;
			printk(KERN_DEBUG "ath: country maps to "
			       "regdmn code: 0x%0x\n",
			       regdmn);
		}
	}

	reg->regpair = ath_get_regpair(regdmn);

	if (!reg->regpair) {
		printk(KERN_DEBUG "ath: "
			"No regulatory domain pair found, cannot continue\n");
		return -EINVAL;
	}

	if (!country)
		country = ath_regd_find_country_by_rd(regdmn);

	if (country) {
		reg->alpha2[0] = country->isoName[0];
		reg->alpha2[1] = country->isoName[1];
	} else {
		reg->alpha2[0] = '0';
		reg->alpha2[1] = '0';
	}

	printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
		reg->alpha2[0], reg->alpha2[1]);
	printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
		reg->regpair->reg_domain);

	return 0;
}

int
ath_regd_init(struct ath_regulatory *reg,
	      struct wiphy *wiphy,
	      void (*reg_notifier)(struct wiphy *wiphy,
				   struct regulatory_request *request))
{
	struct ath_common *common = container_of(reg, struct ath_common,
						 regulatory);
	int r;

	r = __ath_regd_init(reg);
	if (r)
		return r;

	if (ath_is_world_regd(reg))
		memcpy(&common->reg_world_copy, reg,
		       sizeof(struct ath_regulatory));

	ath_regd_init_wiphy(reg, wiphy, reg_notifier);

	return 0;
}
EXPORT_SYMBOL(ath_regd_init);

u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
			  enum ieee80211_band band)
{
	if (!reg->regpair ||
	    (reg->country_code == CTRY_DEFAULT &&
	     is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
		return SD_NO_CTL;
	}

	if (ath_regd_get_eepromRD(reg) == CTRY_DEFAULT) {
		switch (reg->region) {
		case NL80211_DFS_FCC:
			return CTL_FCC;
		case NL80211_DFS_ETSI:
			return CTL_ETSI;
		case NL80211_DFS_JP:
			return CTL_MKK;
		default:
			break;
		}
	}

	switch (band) {
	case IEEE80211_BAND_2GHZ:
		return reg->regpair->reg_2ghz_ctl;
	case IEEE80211_BAND_5GHZ:
		return reg->regpair->reg_5ghz_ctl;
	default:
		return NO_CTL;
	}
}
EXPORT_SYMBOL(ath_regd_get_band_ctl);