drivers/net/wireless/ath/regd.c

   1 /*
   2  * Copyright (c) 2008-2009 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/export.h>
  19 #include <net/cfg80211.h>
  20 #include <net/mac80211.h>
  21 #include "regd.h"
  22 #include "regd_common.h"
  23
  24 static int __ath_regd_init(struct ath_regulatory *reg);
  25
  26 /*
  27  * This is a set of common rules used by our world regulatory domains.
  28  * We have 12 world regulatory domains. To save space we consolidate
  29  * the regulatory domains in 5 structures by frequency and change
  30  * the flags on our reg_notifier() on a case by case basis.
  31  */
  32
  33 /* Only these channels all allow active scan on all world regulatory domains */
  34 #define ATH9K_2GHZ_CH01_11      REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
  35
  36 /* We enable active scan on these a case by case basis by regulatory domain */
  37 #define ATH9K_2GHZ_CH12_13      REG_RULE(2467-10, 2472+10, 40, 0, 20,\
  38                                         NL80211_RRF_PASSIVE_SCAN)
  39 #define ATH9K_2GHZ_CH14         REG_RULE(2484-10, 2484+10, 40, 0, 20,\
  40                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_OFDM)
  41
  42 /* We allow IBSS on these on a case by case basis by regulatory domain */
  43 #define ATH9K_5GHZ_5150_5350    REG_RULE(5150-10, 5350+10, 40, 0, 30,\
  44                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  45 #define ATH9K_5GHZ_5470_5850    REG_RULE(5470-10, 5850+10, 40, 0, 30,\
  46                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  47 #define ATH9K_5GHZ_5725_5850    REG_RULE(5725-10, 5850+10, 40, 0, 30,\
  48                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  49
  50 #define ATH9K_2GHZ_ALL          ATH9K_2GHZ_CH01_11, \
  51                                 ATH9K_2GHZ_CH12_13, \
  52                                 ATH9K_2GHZ_CH14
  53
  54 #define ATH9K_5GHZ_ALL          ATH9K_5GHZ_5150_5350, \
  55                                 ATH9K_5GHZ_5470_5850
  56
  57 /* This one skips what we call "mid band" */
  58 #define ATH9K_5GHZ_NO_MIDBAND   ATH9K_5GHZ_5150_5350, \
  59                                 ATH9K_5GHZ_5725_5850
  60
  61 /* Can be used for:
  62  * 0x60, 0x61, 0x62 */
  63 static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
  64         .n_reg_rules = 5,
  65         .alpha2 =  "99",
  66         .reg_rules = {
  67                 ATH9K_2GHZ_ALL,
  68                 ATH9K_5GHZ_ALL,
  69         }
  70 };
  71
  72 /* Can be used by 0x63 and 0x65 */
  73 static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
  74         .n_reg_rules = 4,
  75         .alpha2 =  "99",
  76         .reg_rules = {
  77                 ATH9K_2GHZ_CH01_11,
  78                 ATH9K_2GHZ_CH12_13,
  79                 ATH9K_5GHZ_NO_MIDBAND,
  80         }
  81 };
  82
  83 /* Can be used by 0x64 only */
  84 static const struct ieee80211_regdomain ath_world_regdom_64 = {
  85         .n_reg_rules = 3,
  86         .alpha2 =  "99",
  87         .reg_rules = {
  88                 ATH9K_2GHZ_CH01_11,
  89                 ATH9K_5GHZ_NO_MIDBAND,
  90         }
  91 };
  92
  93 /* Can be used by 0x66 and 0x69 */
  94 static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
  95         .n_reg_rules = 3,
  96         .alpha2 =  "99",
  97         .reg_rules = {
  98                 ATH9K_2GHZ_CH01_11,
  99                 ATH9K_5GHZ_ALL,
 100         }
 101 };
 102
 103 /* Can be used by 0x67, 0x68, 0x6A and 0x6C */
 104 static const struct ieee80211_regdomain ath_world_regdom_67_68_6A_6C = {
 105         .n_reg_rules = 4,
 106         .alpha2 =  "99",
 107         .reg_rules = {
 108                 ATH9K_2GHZ_CH01_11,
 109                 ATH9K_2GHZ_CH12_13,
 110                 ATH9K_5GHZ_ALL,
 111         }
 112 };
 113
 114 static inline bool is_wwr_sku(u16 regd)
 115 {
 116         return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) &&
 117                 (((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
 118                 (regd == WORLD));
 119 }
 120
 121 static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
 122 {
 123         return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
 124 }
 125
 126 bool ath_is_world_regd(struct ath_regulatory *reg)
 127 {
 128         return is_wwr_sku(ath_regd_get_eepromRD(reg));
 129 }
 130 EXPORT_SYMBOL(ath_is_world_regd);
 131
 132 static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
 133 {
 134         /* this is the most restrictive */
 135         return &ath_world_regdom_64;
 136 }
 137
 138 static const struct
 139 ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
 140 {
 141         switch (reg->regpair->regDmnEnum) {
 142         case 0x60:
 143         case 0x61:
 144         case 0x62:
 145                 return &ath_world_regdom_60_61_62;
 146         case 0x63:
 147         case 0x65:
 148                 return &ath_world_regdom_63_65;
 149         case 0x64:
 150                 return &ath_world_regdom_64;
 151         case 0x66:
 152         case 0x69:
 153                 return &ath_world_regdom_66_69;
 154         case 0x67:
 155         case 0x68:
 156         case 0x6A:
 157         case 0x6C:
 158                 return &ath_world_regdom_67_68_6A_6C;
 159         default:
 160                 WARN_ON(1);
 161                 return ath_default_world_regdomain();
 162         }
 163 }
 164
 165 bool ath_is_49ghz_allowed(u16 regdomain)
 166 {
 167         /* possibly more */
 168         return regdomain == MKK9_MKKC;
 169 }
 170 EXPORT_SYMBOL(ath_is_49ghz_allowed);
 171
 172 /* Frequency is one where radar detection is required */
 173 static bool ath_is_radar_freq(u16 center_freq)
 174 {
 175         return (center_freq >= 5260 && center_freq <= 5700);
 176 }
 177
 178 /*
 179  * N.B: These exception rules do not apply radar freqs.
 180  *
 181  * - We enable adhoc (or beaconing) if allowed by 11d
 182  * - We enable active scan if the channel is allowed by 11d
 183  * - If no country IE has been processed and a we determine we have
 184  *   received a beacon on a channel we can enable active scan and
 185  *   adhoc (or beaconing).
 186  */
 187 static void
 188 ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
 189                               enum nl80211_reg_initiator initiator)
 190 {
 191         enum ieee80211_band band;
 192         struct ieee80211_supported_band *sband;
 193         const struct ieee80211_reg_rule *reg_rule;
 194         struct ieee80211_channel *ch;
 195         unsigned int i;
 196         u32 bandwidth = 0;
 197         int r;
 198
 199         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 200
 201                 if (!wiphy->bands[band])
 202                         continue;
 203
 204                 sband = wiphy->bands[band];
 205
 206                 for (i = 0; i < sband->n_channels; i++) {
 207
 208                         ch = &sband->channels[i];
 209
 210                         if (ath_is_radar_freq(ch->center_freq) ||
 211                             (ch->flags & IEEE80211_CHAN_RADAR))
 212                                 continue;
 213
 214                         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 215                                 r = freq_reg_info(wiphy,
 216                                                   ch->center_freq,
 217                                                   bandwidth,
 218                                                   &reg_rule);
 219                                 if (r)
 220                                         continue;
 221                                 /*
 222                                  * If 11d had a rule for this channel ensure
 223                                  * we enable adhoc/beaconing if it allows us to
 224                                  * use it. Note that we would have disabled it
 225                                  * by applying our static world regdomain by
 226                                  * default during init, prior to calling our
 227                                  * regulatory_hint().
 228                                  */
 229                                 if (!(reg_rule->flags &
 230                                     NL80211_RRF_NO_IBSS))
 231                                         ch->flags &=
 232                                           ~IEEE80211_CHAN_NO_IBSS;
 233                                 if (!(reg_rule->flags &
 234                                     NL80211_RRF_PASSIVE_SCAN))
 235                                         ch->flags &=
 236                                           ~IEEE80211_CHAN_PASSIVE_SCAN;
 237                         } else {
 238                                 if (ch->beacon_found)
 239                                         ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 240                                           IEEE80211_CHAN_PASSIVE_SCAN);
 241                         }
 242                 }
 243         }
 244
 245 }
 246
 247 /* Allows active scan scan on Ch 12 and 13 */
 248 static void
 249 ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
 250                                 enum nl80211_reg_initiator initiator)
 251 {
 252         struct ieee80211_supported_band *sband;
 253         struct ieee80211_channel *ch;
 254         const struct ieee80211_reg_rule *reg_rule;
 255         u32 bandwidth = 0;
 256         int r;
 257
 258         sband = wiphy->bands[IEEE80211_BAND_2GHZ];
 259         if (!sband)
 260                 return;
 261
 262         /*
 263          * If no country IE has been received always enable active scan
 264          * on these channels. This is only done for specific regulatory SKUs
 265          */
 266         if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 267                 ch = &sband->channels[11]; /* CH 12 */
 268                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 269                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 270                 ch = &sband->channels[12]; /* CH 13 */
 271                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 272                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 273                 return;
 274         }
 275
 276         /*
 277          * If a country IE has been received check its rule for this
 278          * channel first before enabling active scan. The passive scan
 279          * would have been enforced by the initial processing of our
 280          * custom regulatory domain.
 281          */
 282
 283         ch = &sband->channels[11]; /* CH 12 */
 284         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 285         if (!r) {
 286                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 287                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 288                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 289         }
 290
 291         ch = &sband->channels[12]; /* CH 13 */
 292         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 293         if (!r) {
 294                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 295                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 296                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 297         }
 298 }
 299
 300 /* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
 301 static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
 302 {
 303         struct ieee80211_supported_band *sband;
 304         struct ieee80211_channel *ch;
 305         unsigned int i;
 306
 307         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 308                 return;
 309
 310         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 311
 312         for (i = 0; i < sband->n_channels; i++) {
 313                 ch = &sband->channels[i];
 314                 if (!ath_is_radar_freq(ch->center_freq))
 315                         continue;
 316                 /* We always enable radar detection/DFS on this
 317                  * frequency range. Additionally we also apply on
 318                  * this frequency range:
 319                  * - If STA mode does not yet have DFS supports disable
 320                  *   active scanning
 321                  * - If adhoc mode does not support DFS yet then
 322                  *   disable adhoc in the frequency.
 323                  * - If AP mode does not yet support radar detection/DFS
 324                  *   do not allow AP mode
 325                  */
 326                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 327                         ch->flags |= IEEE80211_CHAN_RADAR |
 328                                      IEEE80211_CHAN_NO_IBSS |
 329                                      IEEE80211_CHAN_PASSIVE_SCAN;
 330         }
 331 }
 332
 333 static void ath_reg_apply_world_flags(struct wiphy *wiphy,
 334                                       enum nl80211_reg_initiator initiator,
 335                                       struct ath_regulatory *reg)
 336 {
 337         switch (reg->regpair->regDmnEnum) {
 338         case 0x60:
 339         case 0x63:
 340         case 0x66:
 341         case 0x67:
 342         case 0x6C:
 343                 ath_reg_apply_beaconing_flags(wiphy, initiator);
 344                 break;
 345         case 0x68:
 346                 ath_reg_apply_beaconing_flags(wiphy, initiator);
 347                 ath_reg_apply_active_scan_flags(wiphy, initiator);
 348                 break;
 349         }
 350 }
 351
 352 static u16 ath_regd_find_country_by_name(char *alpha2)
 353 {
 354         unsigned int i;
 355
 356         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 357                 if (!memcmp(allCountries[i].isoName, alpha2, 2))
 358                         return allCountries[i].countryCode;
 359         }
 360
 361         return -1;
 362 }
 363
 364 int ath_reg_notifier_apply(struct wiphy *wiphy,
 365                            struct regulatory_request *request,
 366                            struct ath_regulatory *reg)
 367 {
 368         struct ath_common *common = container_of(reg, struct ath_common,
 369                                                  regulatory);
 370         u16 country_code;
 371
 372         /* We always apply this */
 373         ath_reg_apply_radar_flags(wiphy);
 374
 375         /*
 376          * This would happen when we have sent a custom regulatory request
 377          * a world regulatory domain and the scheduler hasn't yet processed
 378          * any pending requests in the queue.
 379          */
 380         if (!request)
 381                 return 0;
 382
 383         switch (request->initiator) {
 384         case NL80211_REGDOM_SET_BY_CORE:
 385                 /*
 386                  * If common->reg_world_copy is world roaming it means we *were*
 387                  * world roaming... so we now have to restore that data.
 388                  */
 389                 if (!ath_is_world_regd(&common->reg_world_copy))
 390                         break;
 391
 392                 memcpy(reg, &common->reg_world_copy,
 393                        sizeof(struct ath_regulatory));
 394                 break;
 395         case NL80211_REGDOM_SET_BY_DRIVER:
 396         case NL80211_REGDOM_SET_BY_USER:
 397                 break;
 398         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 399                 if (!ath_is_world_regd(reg))
 400                         break;
 401
 402                 country_code = ath_regd_find_country_by_name(request->alpha2);
 403                 if (country_code == (u16) -1)
 404                         break;
 405
 406                 reg->current_rd = COUNTRY_ERD_FLAG;
 407                 reg->current_rd |= country_code;
 408
 409                 printk(KERN_DEBUG "ath: regdomain 0x%0x updated by CountryIE\n",
 410                         reg->current_rd);
 411                 __ath_regd_init(reg);
 412
 413                 ath_reg_apply_world_flags(wiphy, request->initiator, reg);
 414
 415                 break;
 416         }
 417
 418         return 0;
 419 }
 420 EXPORT_SYMBOL(ath_reg_notifier_apply);
 421
 422 static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
 423 {
 424         u16 rd = ath_regd_get_eepromRD(reg);
 425         int i;
 426
 427         if (rd & COUNTRY_ERD_FLAG) {
 428                 /* EEPROM value is a country code */
 429                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 430                 printk(KERN_DEBUG
 431                        "ath: EEPROM indicates we should expect "
 432                         "a country code\n");
 433                 for (i = 0; i < ARRAY_SIZE(allCountries); i++)
 434                         if (allCountries[i].countryCode == cc)
 435                                 return true;
 436         } else {
 437                 /* EEPROM value is a regpair value */
 438                 if (rd != CTRY_DEFAULT)
 439                         printk(KERN_DEBUG "ath: EEPROM indicates we "
 440                                "should expect a direct regpair map\n");
 441                 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
 442                         if (regDomainPairs[i].regDmnEnum == rd)
 443                                 return true;
 444         }
 445         printk(KERN_DEBUG
 446                  "ath: invalid regulatory domain/country code 0x%x\n", rd);
 447         return false;
 448 }
 449
 450 /* EEPROM country code to regpair mapping */
 451 static struct country_code_to_enum_rd*
 452 ath_regd_find_country(u16 countryCode)
 453 {
 454         int i;
 455
 456         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 457                 if (allCountries[i].countryCode == countryCode)
 458                         return &allCountries[i];
 459         }
 460         return NULL;
 461 }
 462
 463 /* EEPROM rd code to regpair mapping */
 464 static struct country_code_to_enum_rd*
 465 ath_regd_find_country_by_rd(int regdmn)
 466 {
 467         int i;
 468
 469         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 470                 if (allCountries[i].regDmnEnum == regdmn)
 471                         return &allCountries[i];
 472         }
 473         return NULL;
 474 }
 475
 476 /* Returns the map of the EEPROM set RD to a country code */
 477 static u16 ath_regd_get_default_country(u16 rd)
 478 {
 479         if (rd & COUNTRY_ERD_FLAG) {
 480                 struct country_code_to_enum_rd *country = NULL;
 481                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 482
 483                 country = ath_regd_find_country(cc);
 484                 if (country != NULL)
 485                         return cc;
 486         }
 487
 488         return CTRY_DEFAULT;
 489 }
 490
 491 static struct reg_dmn_pair_mapping*
 492 ath_get_regpair(int regdmn)
 493 {
 494         int i;
 495
 496         if (regdmn == NO_ENUMRD)
 497                 return NULL;
 498         for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
 499                 if (regDomainPairs[i].regDmnEnum == regdmn)
 500                         return &regDomainPairs[i];
 501         }
 502         return NULL;
 503 }
 504
 505 static int
 506 ath_regd_init_wiphy(struct ath_regulatory *reg,
 507                     struct wiphy *wiphy,
 508                     int (*reg_notifier)(struct wiphy *wiphy,
 509                                         struct regulatory_request *request))
 510 {
 511         const struct ieee80211_regdomain *regd;
 512
 513         wiphy->reg_notifier = reg_notifier;
 514         wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
 515
 516         if (ath_is_world_regd(reg)) {
 517                 /*
 518                  * Anything applied here (prior to wiphy registration) gets
 519                  * saved on the wiphy orig_* parameters
 520                  */
 521                 regd = ath_world_regdomain(reg);
 522                 wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
 523         } else {
 524                 /*
 525                  * This gets applied in the case of the absence of CRDA,
 526                  * it's our own custom world regulatory domain, similar to
 527                  * cfg80211's but we enable passive scanning.
 528                  */
 529                 regd = ath_default_world_regdomain();
 530         }
 531         wiphy_apply_custom_regulatory(wiphy, regd);
 532         ath_reg_apply_radar_flags(wiphy);
 533         ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 534         return 0;
 535 }
 536
 537 /*
 538  * Some users have reported their EEPROM programmed with
 539  * 0x8000 set, this is not a supported regulatory domain
 540  * but since we have more than one user with it we need
 541  * a solution for them. We default to 0x64, which is the
 542  * default Atheros world regulatory domain.
 543  */
 544 static void ath_regd_sanitize(struct ath_regulatory *reg)
 545 {
 546         if (reg->current_rd != COUNTRY_ERD_FLAG)
 547                 return;
 548         printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
 549         reg->current_rd = 0x64;
 550 }
 551
 552 static int __ath_regd_init(struct ath_regulatory *reg)
 553 {
 554         struct country_code_to_enum_rd *country = NULL;
 555         u16 regdmn;
 556
 557         if (!reg)
 558                 return -EINVAL;
 559
 560         ath_regd_sanitize(reg);
 561
 562         printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);
 563
 564         if (!ath_regd_is_eeprom_valid(reg)) {
 565                 printk(KERN_ERR "ath: Invalid EEPROM contents\n");
 566                 return -EINVAL;
 567         }
 568
 569         regdmn = ath_regd_get_eepromRD(reg);
 570         reg->country_code = ath_regd_get_default_country(regdmn);
 571
 572         if (reg->country_code == CTRY_DEFAULT &&
 573             regdmn == CTRY_DEFAULT) {
 574                 printk(KERN_DEBUG "ath: EEPROM indicates default "
 575                        "country code should be used\n");
 576                 reg->country_code = CTRY_UNITED_STATES;
 577         }
 578
 579         if (reg->country_code == CTRY_DEFAULT) {
 580                 country = NULL;
 581         } else {
 582                 printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
 583                        "map search\n");
 584                 country = ath_regd_find_country(reg->country_code);
 585                 if (country == NULL) {
 586                         printk(KERN_DEBUG
 587                                 "ath: no valid country maps found for "
 588                                 "country code: 0x%0x\n",
 589                                 reg->country_code);
 590                         return -EINVAL;
 591                 } else {
 592                         regdmn = country->regDmnEnum;
 593                         printk(KERN_DEBUG "ath: country maps to "
 594                                "regdmn code: 0x%0x\n",
 595                                regdmn);
 596                 }
 597         }
 598
 599         reg->regpair = ath_get_regpair(regdmn);
 600
 601         if (!reg->regpair) {
 602                 printk(KERN_DEBUG "ath: "
 603                         "No regulatory domain pair found, cannot continue\n");
 604                 return -EINVAL;
 605         }
 606
 607         if (!country)
 608                 country = ath_regd_find_country_by_rd(regdmn);
 609
 610         if (country) {
 611                 reg->alpha2[0] = country->isoName[0];
 612                 reg->alpha2[1] = country->isoName[1];
 613         } else {
 614                 reg->alpha2[0] = '0';
 615                 reg->alpha2[1] = '0';
 616         }
 617
 618         printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
 619                 reg->alpha2[0], reg->alpha2[1]);
 620         printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
 621                 reg->regpair->regDmnEnum);
 622
 623         return 0;
 624 }
 625
 626 int
 627 ath_regd_init(struct ath_regulatory *reg,
 628               struct wiphy *wiphy,
 629               int (*reg_notifier)(struct wiphy *wiphy,
 630                                   struct regulatory_request *request))
 631 {
 632         struct ath_common *common = container_of(reg, struct ath_common,
 633                                                  regulatory);
 634         int r;
 635
 636         r = __ath_regd_init(reg);
 637         if (r)
 638                 return r;
 639
 640         if (ath_is_world_regd(reg))
 641                 memcpy(&common->reg_world_copy, reg,
 642                        sizeof(struct ath_regulatory));
 643
 644         ath_regd_init_wiphy(reg, wiphy, reg_notifier);
 645
 646         return 0;
 647 }
 648 EXPORT_SYMBOL(ath_regd_init);
 649
 650 u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
 651                           enum ieee80211_band band)
 652 {
 653         if (!reg->regpair ||
 654             (reg->country_code == CTRY_DEFAULT &&
 655              is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
 656                 return SD_NO_CTL;
 657         }
 658
 659         switch (band) {
 660         case IEEE80211_BAND_2GHZ:
 661                 return reg->regpair->reg_2ghz_ctl;
 662         case IEEE80211_BAND_5GHZ:
 663                 return reg->regpair->reg_5ghz_ctl;
 664         default:
 665                 return NO_CTL;
 666         }
 667 }
 668 EXPORT_SYMBOL(ath_regd_get_band_ctl);