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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/kernel.h>
  20 #include <linux/export.h>
  21 #include <net/cfg80211.h>
  22 #include <net/mac80211.h>
  23 #include "regd.h"
  24 #include "regd_common.h"
  25
  26 static int __ath_regd_init(struct ath_regulatory *reg);
  27
  28 /*
  29  * This is a set of common rules used by our world regulatory domains.
  30  * We have 12 world regulatory domains. To save space we consolidate
  31  * the regulatory domains in 5 structures by frequency and change
  32  * the flags on our reg_notifier() on a case by case basis.
  33  */
  34
  35 /* Only these channels all allow active scan on all world regulatory domains */
  36 #define ATH9K_2GHZ_CH01_11      REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
  37
  38 /* We enable active scan on these a case by case basis by regulatory domain */
  39 #define ATH9K_2GHZ_CH12_13      REG_RULE(2467-10, 2472+10, 40, 0, 20,\
  40                                         NL80211_RRF_PASSIVE_SCAN)
  41 #define ATH9K_2GHZ_CH14         REG_RULE(2484-10, 2484+10, 40, 0, 20,\
  42                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_OFDM)
  43
  44 /* We allow IBSS on these on a case by case basis by regulatory domain */
  45 #define ATH9K_5GHZ_5150_5350    REG_RULE(5150-10, 5350+10, 80, 0, 30,\
  46                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  47 #define ATH9K_5GHZ_5470_5850    REG_RULE(5470-10, 5850+10, 80, 0, 30,\
  48                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  49 #define ATH9K_5GHZ_5725_5850    REG_RULE(5725-10, 5850+10, 80, 0, 30,\
  50                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  51
  52 #define ATH9K_2GHZ_ALL          ATH9K_2GHZ_CH01_11, \
  53                                 ATH9K_2GHZ_CH12_13, \
  54                                 ATH9K_2GHZ_CH14
  55
  56 #define ATH9K_5GHZ_ALL          ATH9K_5GHZ_5150_5350, \
  57                                 ATH9K_5GHZ_5470_5850
  58
  59 /* This one skips what we call "mid band" */
  60 #define ATH9K_5GHZ_NO_MIDBAND   ATH9K_5GHZ_5150_5350, \
  61                                 ATH9K_5GHZ_5725_5850
  62
  63 /* Can be used for:
  64  * 0x60, 0x61, 0x62 */
  65 static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
  66         .n_reg_rules = 5,
  67         .alpha2 =  "99",
  68         .reg_rules = {
  69                 ATH9K_2GHZ_ALL,
  70                 ATH9K_5GHZ_ALL,
  71         }
  72 };
  73
  74 /* Can be used by 0x63 and 0x65 */
  75 static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
  76         .n_reg_rules = 4,
  77         .alpha2 =  "99",
  78         .reg_rules = {
  79                 ATH9K_2GHZ_CH01_11,
  80                 ATH9K_2GHZ_CH12_13,
  81                 ATH9K_5GHZ_NO_MIDBAND,
  82         }
  83 };
  84
  85 /* Can be used by 0x64 only */
  86 static const struct ieee80211_regdomain ath_world_regdom_64 = {
  87         .n_reg_rules = 3,
  88         .alpha2 =  "99",
  89         .reg_rules = {
  90                 ATH9K_2GHZ_CH01_11,
  91                 ATH9K_5GHZ_NO_MIDBAND,
  92         }
  93 };
  94
  95 /* Can be used by 0x66 and 0x69 */
  96 static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
  97         .n_reg_rules = 3,
  98         .alpha2 =  "99",
  99         .reg_rules = {
 100                 ATH9K_2GHZ_CH01_11,
 101                 ATH9K_5GHZ_ALL,
 102         }
 103 };
 104
 105 /* Can be used by 0x67, 0x68, 0x6A and 0x6C */
 106 static const struct ieee80211_regdomain ath_world_regdom_67_68_6A_6C = {
 107         .n_reg_rules = 4,
 108         .alpha2 =  "99",
 109         .reg_rules = {
 110                 ATH9K_2GHZ_CH01_11,
 111                 ATH9K_2GHZ_CH12_13,
 112                 ATH9K_5GHZ_ALL,
 113         }
 114 };
 115
 116 static inline bool is_wwr_sku(u16 regd)
 117 {
 118         return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) &&
 119                 (((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
 120                 (regd == WORLD));
 121 }
 122
 123 static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
 124 {
 125         return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
 126 }
 127
 128 bool ath_is_world_regd(struct ath_regulatory *reg)
 129 {
 130         return is_wwr_sku(ath_regd_get_eepromRD(reg));
 131 }
 132 EXPORT_SYMBOL(ath_is_world_regd);
 133
 134 static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
 135 {
 136         /* this is the most restrictive */
 137         return &ath_world_regdom_64;
 138 }
 139
 140 static const struct
 141 ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
 142 {
 143         switch (reg->regpair->regDmnEnum) {
 144         case 0x60:
 145         case 0x61:
 146         case 0x62:
 147                 return &ath_world_regdom_60_61_62;
 148         case 0x63:
 149         case 0x65:
 150                 return &ath_world_regdom_63_65;
 151         case 0x64:
 152                 return &ath_world_regdom_64;
 153         case 0x66:
 154         case 0x69:
 155                 return &ath_world_regdom_66_69;
 156         case 0x67:
 157         case 0x68:
 158         case 0x6A:
 159         case 0x6C:
 160                 return &ath_world_regdom_67_68_6A_6C;
 161         default:
 162                 WARN_ON(1);
 163                 return ath_default_world_regdomain();
 164         }
 165 }
 166
 167 bool ath_is_49ghz_allowed(u16 regdomain)
 168 {
 169         /* possibly more */
 170         return regdomain == MKK9_MKKC;
 171 }
 172 EXPORT_SYMBOL(ath_is_49ghz_allowed);
 173
 174 /* Frequency is one where radar detection is required */
 175 static bool ath_is_radar_freq(u16 center_freq)
 176 {
 177         return (center_freq >= 5260 && center_freq <= 5700);
 178 }
 179
 180 /*
 181  * N.B: These exception rules do not apply radar freqs.
 182  *
 183  * - We enable adhoc (or beaconing) if allowed by 11d
 184  * - We enable active scan if the channel is allowed by 11d
 185  * - If no country IE has been processed and a we determine we have
 186  *   received a beacon on a channel we can enable active scan and
 187  *   adhoc (or beaconing).
 188  */
 189 static void
 190 ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
 191                               enum nl80211_reg_initiator initiator)
 192 {
 193         enum ieee80211_band band;
 194         struct ieee80211_supported_band *sband;
 195         const struct ieee80211_reg_rule *reg_rule;
 196         struct ieee80211_channel *ch;
 197         unsigned int i;
 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                                 reg_rule = freq_reg_info(wiphy, ch->center_freq);
 216                                 if (IS_ERR(reg_rule))
 217                                         continue;
 218                                 /*
 219                                  * If 11d had a rule for this channel ensure
 220                                  * we enable adhoc/beaconing if it allows us to
 221                                  * use it. Note that we would have disabled it
 222                                  * by applying our static world regdomain by
 223                                  * default during init, prior to calling our
 224                                  * regulatory_hint().
 225                                  */
 226                                 if (!(reg_rule->flags &
 227                                     NL80211_RRF_NO_IBSS))
 228                                         ch->flags &=
 229                                           ~IEEE80211_CHAN_NO_IBSS;
 230                                 if (!(reg_rule->flags &
 231                                     NL80211_RRF_PASSIVE_SCAN))
 232                                         ch->flags &=
 233                                           ~IEEE80211_CHAN_PASSIVE_SCAN;
 234                         } else {
 235                                 if (ch->beacon_found)
 236                                         ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 237                                           IEEE80211_CHAN_PASSIVE_SCAN);
 238                         }
 239                 }
 240         }
 241
 242 }
 243
 244 /* Allows active scan scan on Ch 12 and 13 */
 245 static void
 246 ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
 247                                 enum nl80211_reg_initiator initiator)
 248 {
 249         struct ieee80211_supported_band *sband;
 250         struct ieee80211_channel *ch;
 251         const struct ieee80211_reg_rule *reg_rule;
 252
 253         sband = wiphy->bands[IEEE80211_BAND_2GHZ];
 254         if (!sband)
 255                 return;
 256
 257         /*
 258          * If no country IE has been received always enable active scan
 259          * on these channels. This is only done for specific regulatory SKUs
 260          */
 261         if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 262                 ch = &sband->channels[11]; /* CH 12 */
 263                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 264                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 265                 ch = &sband->channels[12]; /* CH 13 */
 266                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 267                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 268                 return;
 269         }
 270
 271         /*
 272          * If a country IE has been received check its rule for this
 273          * channel first before enabling active scan. The passive scan
 274          * would have been enforced by the initial processing of our
 275          * custom regulatory domain.
 276          */
 277
 278         ch = &sband->channels[11]; /* CH 12 */
 279         reg_rule = freq_reg_info(wiphy, ch->center_freq);
 280         if (!IS_ERR(reg_rule)) {
 281                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 282                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 283                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 284         }
 285
 286         ch = &sband->channels[12]; /* CH 13 */
 287         reg_rule = freq_reg_info(wiphy, ch->center_freq);
 288         if (!IS_ERR(reg_rule)) {
 289                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 290                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 291                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 292         }
 293 }
 294
 295 /* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
 296 static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
 297 {
 298         struct ieee80211_supported_band *sband;
 299         struct ieee80211_channel *ch;
 300         unsigned int i;
 301
 302         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 303                 return;
 304
 305         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 306
 307         for (i = 0; i < sband->n_channels; i++) {
 308                 ch = &sband->channels[i];
 309                 if (!ath_is_radar_freq(ch->center_freq))
 310                         continue;
 311                 /* We always enable radar detection/DFS on this
 312                  * frequency range. Additionally we also apply on
 313                  * this frequency range:
 314                  * - If STA mode does not yet have DFS supports disable
 315                  *   active scanning
 316                  * - If adhoc mode does not support DFS yet then
 317                  *   disable adhoc in the frequency.
 318                  * - If AP mode does not yet support radar detection/DFS
 319                  *   do not allow AP mode
 320                  */
 321                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 322                         ch->flags |= IEEE80211_CHAN_RADAR |
 323                                      IEEE80211_CHAN_NO_IBSS |
 324                                      IEEE80211_CHAN_PASSIVE_SCAN;
 325         }
 326 }
 327
 328 static void ath_reg_apply_world_flags(struct wiphy *wiphy,
 329                                       enum nl80211_reg_initiator initiator,
 330                                       struct ath_regulatory *reg)
 331 {
 332         switch (reg->regpair->regDmnEnum) {
 333         case 0x60:
 334         case 0x63:
 335         case 0x66:
 336         case 0x67:
 337         case 0x6C:
 338                 ath_reg_apply_beaconing_flags(wiphy, initiator);
 339                 break;
 340         case 0x68:
 341                 ath_reg_apply_beaconing_flags(wiphy, initiator);
 342                 ath_reg_apply_active_scan_flags(wiphy, initiator);
 343                 break;
 344         }
 345 }
 346
 347 static u16 ath_regd_find_country_by_name(char *alpha2)
 348 {
 349         unsigned int i;
 350
 351         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 352                 if (!memcmp(allCountries[i].isoName, alpha2, 2))
 353                         return allCountries[i].countryCode;
 354         }
 355
 356         return -1;
 357 }
 358
 359 static int __ath_reg_dyn_country(struct wiphy *wiphy,
 360                                  struct ath_regulatory *reg,
 361                                  struct regulatory_request *request)
 362 {
 363         u16 country_code;
 364
 365         if (!ath_is_world_regd(reg))
 366                 return -EINVAL;
 367
 368         country_code = ath_regd_find_country_by_name(request->alpha2);
 369         if (country_code == (u16) -1)
 370                 return -EINVAL;
 371
 372         reg->current_rd = COUNTRY_ERD_FLAG;
 373         reg->current_rd |= country_code;
 374
 375         __ath_regd_init(reg);
 376
 377         ath_reg_apply_world_flags(wiphy, request->initiator, reg);
 378
 379         return 0;
 380 }
 381
 382 static void ath_reg_dyn_country(struct wiphy *wiphy,
 383                                 struct ath_regulatory *reg,
 384                                 struct regulatory_request *request)
 385 {
 386         if (__ath_reg_dyn_country(wiphy, reg, request))
 387                 return;
 388
 389         printk(KERN_DEBUG "ath: regdomain 0x%0x "
 390                           "dynamically updated by %s\n",
 391                reg->current_rd,
 392                reg_initiator_name(request->initiator));
 393 }
 394
 395 static bool dynamic_country_user_possible(struct ath_regulatory *reg)
 396 {
 397         if (config_enabled(CONFIG_ATH_REG_DYNAMIC_USER_CERT_TESTING))
 398                 return true;
 399
 400         switch (reg->country_code) {
 401         case CTRY_UNITED_STATES:
 402         case CTRY_JAPAN1:
 403         case CTRY_JAPAN2:
 404         case CTRY_JAPAN3:
 405         case CTRY_JAPAN4:
 406         case CTRY_JAPAN5:
 407         case CTRY_JAPAN6:
 408         case CTRY_JAPAN7:
 409         case CTRY_JAPAN8:
 410         case CTRY_JAPAN9:
 411         case CTRY_JAPAN10:
 412         case CTRY_JAPAN11:
 413         case CTRY_JAPAN12:
 414         case CTRY_JAPAN13:
 415         case CTRY_JAPAN14:
 416         case CTRY_JAPAN15:
 417         case CTRY_JAPAN16:
 418         case CTRY_JAPAN17:
 419         case CTRY_JAPAN18:
 420         case CTRY_JAPAN19:
 421         case CTRY_JAPAN20:
 422         case CTRY_JAPAN21:
 423         case CTRY_JAPAN22:
 424         case CTRY_JAPAN23:
 425         case CTRY_JAPAN24:
 426         case CTRY_JAPAN25:
 427         case CTRY_JAPAN26:
 428         case CTRY_JAPAN27:
 429         case CTRY_JAPAN28:
 430         case CTRY_JAPAN29:
 431         case CTRY_JAPAN30:
 432         case CTRY_JAPAN31:
 433         case CTRY_JAPAN32:
 434         case CTRY_JAPAN33:
 435         case CTRY_JAPAN34:
 436         case CTRY_JAPAN35:
 437         case CTRY_JAPAN36:
 438         case CTRY_JAPAN37:
 439         case CTRY_JAPAN38:
 440         case CTRY_JAPAN39:
 441         case CTRY_JAPAN40:
 442         case CTRY_JAPAN41:
 443         case CTRY_JAPAN42:
 444         case CTRY_JAPAN43:
 445         case CTRY_JAPAN44:
 446         case CTRY_JAPAN45:
 447         case CTRY_JAPAN46:
 448         case CTRY_JAPAN47:
 449         case CTRY_JAPAN48:
 450         case CTRY_JAPAN49:
 451         case CTRY_JAPAN50:
 452         case CTRY_JAPAN51:
 453         case CTRY_JAPAN52:
 454         case CTRY_JAPAN53:
 455         case CTRY_JAPAN54:
 456         case CTRY_JAPAN55:
 457         case CTRY_JAPAN56:
 458         case CTRY_JAPAN57:
 459         case CTRY_JAPAN58:
 460         case CTRY_JAPAN59:
 461                 return false;
 462         }
 463
 464         return true;
 465 }
 466
 467 static void ath_reg_dyn_country_user(struct wiphy *wiphy,
 468                                      struct ath_regulatory *reg,
 469                                      struct regulatory_request *request)
 470 {
 471         if (!config_enabled(CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS))
 472                 return;
 473         if (!dynamic_country_user_possible(reg))
 474                 return;
 475         ath_reg_dyn_country(wiphy, reg, request);
 476 }
 477
 478 void ath_reg_notifier_apply(struct wiphy *wiphy,
 479                             struct regulatory_request *request,
 480                             struct ath_regulatory *reg)
 481 {
 482         struct ath_common *common = container_of(reg, struct ath_common,
 483                                                  regulatory);
 484         /* We always apply this */
 485         ath_reg_apply_radar_flags(wiphy);
 486
 487         /*
 488          * This would happen when we have sent a custom regulatory request
 489          * a world regulatory domain and the scheduler hasn't yet processed
 490          * any pending requests in the queue.
 491          */
 492         if (!request)
 493                 return;
 494
 495         switch (request->initiator) {
 496         case NL80211_REGDOM_SET_BY_CORE:
 497                 /*
 498                  * If common->reg_world_copy is world roaming it means we *were*
 499                  * world roaming... so we now have to restore that data.
 500                  */
 501                 if (!ath_is_world_regd(&common->reg_world_copy))
 502                         break;
 503
 504                 memcpy(reg, &common->reg_world_copy,
 505                        sizeof(struct ath_regulatory));
 506                 break;
 507         case NL80211_REGDOM_SET_BY_DRIVER:
 508                 break;
 509         case NL80211_REGDOM_SET_BY_USER:
 510                 ath_reg_dyn_country_user(wiphy, reg, request);
 511                 break;
 512         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 513                 ath_reg_dyn_country(wiphy, reg, request);
 514                 break;
 515         }
 516 }
 517 EXPORT_SYMBOL(ath_reg_notifier_apply);
 518
 519 static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
 520 {
 521         u16 rd = ath_regd_get_eepromRD(reg);
 522         int i;
 523
 524         if (rd & COUNTRY_ERD_FLAG) {
 525                 /* EEPROM value is a country code */
 526                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 527                 printk(KERN_DEBUG
 528                        "ath: EEPROM indicates we should expect "
 529                         "a country code\n");
 530                 for (i = 0; i < ARRAY_SIZE(allCountries); i++)
 531                         if (allCountries[i].countryCode == cc)
 532                                 return true;
 533         } else {
 534                 /* EEPROM value is a regpair value */
 535                 if (rd != CTRY_DEFAULT)
 536                         printk(KERN_DEBUG "ath: EEPROM indicates we "
 537                                "should expect a direct regpair map\n");
 538                 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
 539                         if (regDomainPairs[i].regDmnEnum == rd)
 540                                 return true;
 541         }
 542         printk(KERN_DEBUG
 543                  "ath: invalid regulatory domain/country code 0x%x\n", rd);
 544         return false;
 545 }
 546
 547 /* EEPROM country code to regpair mapping */
 548 static struct country_code_to_enum_rd*
 549 ath_regd_find_country(u16 countryCode)
 550 {
 551         int i;
 552
 553         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 554                 if (allCountries[i].countryCode == countryCode)
 555                         return &allCountries[i];
 556         }
 557         return NULL;
 558 }
 559
 560 /* EEPROM rd code to regpair mapping */
 561 static struct country_code_to_enum_rd*
 562 ath_regd_find_country_by_rd(int regdmn)
 563 {
 564         int i;
 565
 566         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 567                 if (allCountries[i].regDmnEnum == regdmn)
 568                         return &allCountries[i];
 569         }
 570         return NULL;
 571 }
 572
 573 /* Returns the map of the EEPROM set RD to a country code */
 574 static u16 ath_regd_get_default_country(u16 rd)
 575 {
 576         if (rd & COUNTRY_ERD_FLAG) {
 577                 struct country_code_to_enum_rd *country = NULL;
 578                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 579
 580                 country = ath_regd_find_country(cc);
 581                 if (country != NULL)
 582                         return cc;
 583         }
 584
 585         return CTRY_DEFAULT;
 586 }
 587
 588 static struct reg_dmn_pair_mapping*
 589 ath_get_regpair(int regdmn)
 590 {
 591         int i;
 592
 593         if (regdmn == NO_ENUMRD)
 594                 return NULL;
 595         for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
 596                 if (regDomainPairs[i].regDmnEnum == regdmn)
 597                         return &regDomainPairs[i];
 598         }
 599         return NULL;
 600 }
 601
 602 static int
 603 ath_regd_init_wiphy(struct ath_regulatory *reg,
 604                     struct wiphy *wiphy,
 605                     void (*reg_notifier)(struct wiphy *wiphy,
 606                                          struct regulatory_request *request))
 607 {
 608         const struct ieee80211_regdomain *regd;
 609
 610         wiphy->reg_notifier = reg_notifier;
 611         wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
 612
 613         if (ath_is_world_regd(reg)) {
 614                 /*
 615                  * Anything applied here (prior to wiphy registration) gets
 616                  * saved on the wiphy orig_* parameters
 617                  */
 618                 regd = ath_world_regdomain(reg);
 619                 wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
 620         } else {
 621                 /*
 622                  * This gets applied in the case of the absence of CRDA,
 623                  * it's our own custom world regulatory domain, similar to
 624                  * cfg80211's but we enable passive scanning.
 625                  */
 626                 regd = ath_default_world_regdomain();
 627         }
 628         wiphy_apply_custom_regulatory(wiphy, regd);
 629         ath_reg_apply_radar_flags(wiphy);
 630         ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 631         return 0;
 632 }
 633
 634 /*
 635  * Some users have reported their EEPROM programmed with
 636  * 0x8000 set, this is not a supported regulatory domain
 637  * but since we have more than one user with it we need
 638  * a solution for them. We default to 0x64, which is the
 639  * default Atheros world regulatory domain.
 640  */
 641 static void ath_regd_sanitize(struct ath_regulatory *reg)
 642 {
 643         if (reg->current_rd != COUNTRY_ERD_FLAG)
 644                 return;
 645         printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
 646         reg->current_rd = 0x64;
 647 }
 648
 649 static int __ath_regd_init(struct ath_regulatory *reg)
 650 {
 651         struct country_code_to_enum_rd *country = NULL;
 652         u16 regdmn;
 653
 654         if (!reg)
 655                 return -EINVAL;
 656
 657         ath_regd_sanitize(reg);
 658
 659         printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);
 660
 661         if (!ath_regd_is_eeprom_valid(reg)) {
 662                 pr_err("Invalid EEPROM contents\n");
 663                 return -EINVAL;
 664         }
 665
 666         regdmn = ath_regd_get_eepromRD(reg);
 667         reg->country_code = ath_regd_get_default_country(regdmn);
 668
 669         if (reg->country_code == CTRY_DEFAULT &&
 670             regdmn == CTRY_DEFAULT) {
 671                 printk(KERN_DEBUG "ath: EEPROM indicates default "
 672                        "country code should be used\n");
 673                 reg->country_code = CTRY_UNITED_STATES;
 674         }
 675
 676         if (reg->country_code == CTRY_DEFAULT) {
 677                 country = NULL;
 678         } else {
 679                 printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
 680                        "map search\n");
 681                 country = ath_regd_find_country(reg->country_code);
 682                 if (country == NULL) {
 683                         printk(KERN_DEBUG
 684                                 "ath: no valid country maps found for "
 685                                 "country code: 0x%0x\n",
 686                                 reg->country_code);
 687                         return -EINVAL;
 688                 } else {
 689                         regdmn = country->regDmnEnum;
 690                         printk(KERN_DEBUG "ath: country maps to "
 691                                "regdmn code: 0x%0x\n",
 692                                regdmn);
 693                 }
 694         }
 695
 696         reg->regpair = ath_get_regpair(regdmn);
 697
 698         if (!reg->regpair) {
 699                 printk(KERN_DEBUG "ath: "
 700                         "No regulatory domain pair found, cannot continue\n");
 701                 return -EINVAL;
 702         }
 703
 704         if (!country)
 705                 country = ath_regd_find_country_by_rd(regdmn);
 706
 707         if (country) {
 708                 reg->alpha2[0] = country->isoName[0];
 709                 reg->alpha2[1] = country->isoName[1];
 710         } else {
 711                 reg->alpha2[0] = '0';
 712                 reg->alpha2[1] = '0';
 713         }
 714
 715         printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
 716                 reg->alpha2[0], reg->alpha2[1]);
 717         printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
 718                 reg->regpair->regDmnEnum);
 719
 720         return 0;
 721 }
 722
 723 int
 724 ath_regd_init(struct ath_regulatory *reg,
 725               struct wiphy *wiphy,
 726               void (*reg_notifier)(struct wiphy *wiphy,
 727                                    struct regulatory_request *request))
 728 {
 729         struct ath_common *common = container_of(reg, struct ath_common,
 730                                                  regulatory);
 731         int r;
 732
 733         r = __ath_regd_init(reg);
 734         if (r)
 735                 return r;
 736
 737         if (ath_is_world_regd(reg))
 738                 memcpy(&common->reg_world_copy, reg,
 739                        sizeof(struct ath_regulatory));
 740
 741         ath_regd_init_wiphy(reg, wiphy, reg_notifier);
 742
 743         return 0;
 744 }
 745 EXPORT_SYMBOL(ath_regd_init);
 746
 747 u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
 748                           enum ieee80211_band band)
 749 {
 750         if (!reg->regpair ||
 751             (reg->country_code == CTRY_DEFAULT &&
 752              is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
 753                 return SD_NO_CTL;
 754         }
 755
 756         switch (band) {
 757         case IEEE80211_BAND_2GHZ:
 758                 return reg->regpair->reg_2ghz_ctl;
 759         case IEEE80211_BAND_5GHZ:
 760                 return reg->regpair->reg_5ghz_ctl;
 761         default:
 762                 return NO_CTL;
 763         }
 764 }
 765 EXPORT_SYMBOL(ath_regd_get_band_ctl);