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, 40, 0, 30,\
  46                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  47 #define ATH9K_5GHZ_5470_5850    REG_RULE(5470-10, 5850+10, 40, 0, 30,\
  48                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  49 #define ATH9K_5GHZ_5725_5850    REG_RULE(5725-10, 5850+10, 40, 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         u32 bandwidth = 0;
 199         int r;
 200
 201         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 202
 203                 if (!wiphy->bands[band])
 204                         continue;
 205
 206                 sband = wiphy->bands[band];
 207
 208                 for (i = 0; i < sband->n_channels; i++) {
 209
 210                         ch = &sband->channels[i];
 211
 212                         if (ath_is_radar_freq(ch->center_freq) ||
 213                             (ch->flags & IEEE80211_CHAN_RADAR))
 214                                 continue;
 215
 216                         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 217                                 r = freq_reg_info(wiphy,
 218                                                   ch->center_freq,
 219                                                   bandwidth,
 220                                                   &reg_rule);
 221                                 if (r)
 222                                         continue;
 223                                 /*
 224                                  * If 11d had a rule for this channel ensure
 225                                  * we enable adhoc/beaconing if it allows us to
 226                                  * use it. Note that we would have disabled it
 227                                  * by applying our static world regdomain by
 228                                  * default during init, prior to calling our
 229                                  * regulatory_hint().
 230                                  */
 231                                 if (!(reg_rule->flags &
 232                                     NL80211_RRF_NO_IBSS))
 233                                         ch->flags &=
 234                                           ~IEEE80211_CHAN_NO_IBSS;
 235                                 if (!(reg_rule->flags &
 236                                     NL80211_RRF_PASSIVE_SCAN))
 237                                         ch->flags &=
 238                                           ~IEEE80211_CHAN_PASSIVE_SCAN;
 239                         } else {
 240                                 if (ch->beacon_found)
 241                                         ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 242                                           IEEE80211_CHAN_PASSIVE_SCAN);
 243                         }
 244                 }
 245         }
 246
 247 }
 248
 249 /* Allows active scan scan on Ch 12 and 13 */
 250 static void
 251 ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
 252                                 enum nl80211_reg_initiator initiator)
 253 {
 254         struct ieee80211_supported_band *sband;
 255         struct ieee80211_channel *ch;
 256         const struct ieee80211_reg_rule *reg_rule;
 257         u32 bandwidth = 0;
 258         int r;
 259
 260         sband = wiphy->bands[IEEE80211_BAND_2GHZ];
 261         if (!sband)
 262                 return;
 263
 264         /*
 265          * If no country IE has been received always enable active scan
 266          * on these channels. This is only done for specific regulatory SKUs
 267          */
 268         if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 269                 ch = &sband->channels[11]; /* CH 12 */
 270                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 271                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 272                 ch = &sband->channels[12]; /* CH 13 */
 273                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 274                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 275                 return;
 276         }
 277
 278         /*
 279          * If a country IE has been received check its rule for this
 280          * channel first before enabling active scan. The passive scan
 281          * would have been enforced by the initial processing of our
 282          * custom regulatory domain.
 283          */
 284
 285         ch = &sband->channels[11]; /* CH 12 */
 286         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 287         if (!r) {
 288                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 289                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 290                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 291         }
 292
 293         ch = &sband->channels[12]; /* CH 13 */
 294         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 295         if (!r) {
 296                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 297                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 298                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 299         }
 300 }
 301
 302 /* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
 303 static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
 304 {
 305         struct ieee80211_supported_band *sband;
 306         struct ieee80211_channel *ch;
 307         unsigned int i;
 308
 309         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 310                 return;
 311
 312         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 313
 314         for (i = 0; i < sband->n_channels; i++) {
 315                 ch = &sband->channels[i];
 316                 if (!ath_is_radar_freq(ch->center_freq))
 317                         continue;
 318                 /* We always enable radar detection/DFS on this
 319                  * frequency range. Additionally we also apply on
 320                  * this frequency range:
 321                  * - If STA mode does not yet have DFS supports disable
 322                  *   active scanning
 323                  * - If adhoc mode does not support DFS yet then
 324                  *   disable adhoc in the frequency.
 325                  * - If AP mode does not yet support radar detection/DFS
 326                  *   do not allow AP mode
 327                  */
 328                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 329                         ch->flags |= IEEE80211_CHAN_RADAR |
 330                                      IEEE80211_CHAN_NO_IBSS |
 331                                      IEEE80211_CHAN_PASSIVE_SCAN;
 332         }
 333 }
 334
 335 static void ath_reg_apply_world_flags(struct wiphy *wiphy,
 336                                       enum nl80211_reg_initiator initiator,
 337                                       struct ath_regulatory *reg)
 338 {
 339         switch (reg->regpair->regDmnEnum) {
 340         case 0x60:
 341         case 0x63:
 342         case 0x66:
 343         case 0x67:
 344         case 0x6C:
 345                 ath_reg_apply_beaconing_flags(wiphy, initiator);
 346                 break;
 347         case 0x68:
 348                 ath_reg_apply_beaconing_flags(wiphy, initiator);
 349                 ath_reg_apply_active_scan_flags(wiphy, initiator);
 350                 break;
 351         }
 352 }
 353
 354 static u16 ath_regd_find_country_by_name(char *alpha2)
 355 {
 356         unsigned int i;
 357
 358         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 359                 if (!memcmp(allCountries[i].isoName, alpha2, 2))
 360                         return allCountries[i].countryCode;
 361         }
 362
 363         return -1;
 364 }
 365
 366 int ath_reg_notifier_apply(struct wiphy *wiphy,
 367                            struct regulatory_request *request,
 368                            struct ath_regulatory *reg)
 369 {
 370         struct ath_common *common = container_of(reg, struct ath_common,
 371                                                  regulatory);
 372         u16 country_code;
 373
 374         /* We always apply this */
 375         ath_reg_apply_radar_flags(wiphy);
 376
 377         /*
 378          * This would happen when we have sent a custom regulatory request
 379          * a world regulatory domain and the scheduler hasn't yet processed
 380          * any pending requests in the queue.
 381          */
 382         if (!request)
 383                 return 0;
 384
 385         switch (request->initiator) {
 386         case NL80211_REGDOM_SET_BY_CORE:
 387                 /*
 388                  * If common->reg_world_copy is world roaming it means we *were*
 389                  * world roaming... so we now have to restore that data.
 390                  */
 391                 if (!ath_is_world_regd(&common->reg_world_copy))
 392                         break;
 393
 394                 memcpy(reg, &common->reg_world_copy,
 395                        sizeof(struct ath_regulatory));
 396                 break;
 397         case NL80211_REGDOM_SET_BY_DRIVER:
 398         case NL80211_REGDOM_SET_BY_USER:
 399                 break;
 400         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 401                 if (!ath_is_world_regd(reg))
 402                         break;
 403
 404                 country_code = ath_regd_find_country_by_name(request->alpha2);
 405                 if (country_code == (u16) -1)
 406                         break;
 407
 408                 reg->current_rd = COUNTRY_ERD_FLAG;
 409                 reg->current_rd |= country_code;
 410
 411                 printk(KERN_DEBUG "ath: regdomain 0x%0x updated by CountryIE\n",
 412                         reg->current_rd);
 413                 __ath_regd_init(reg);
 414
 415                 ath_reg_apply_world_flags(wiphy, request->initiator, reg);
 416
 417                 break;
 418         }
 419
 420         return 0;
 421 }
 422 EXPORT_SYMBOL(ath_reg_notifier_apply);
 423
 424 static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
 425 {
 426         u16 rd = ath_regd_get_eepromRD(reg);
 427         int i;
 428
 429         if (rd & COUNTRY_ERD_FLAG) {
 430                 /* EEPROM value is a country code */
 431                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 432                 printk(KERN_DEBUG
 433                        "ath: EEPROM indicates we should expect "
 434                         "a country code\n");
 435                 for (i = 0; i < ARRAY_SIZE(allCountries); i++)
 436                         if (allCountries[i].countryCode == cc)
 437                                 return true;
 438         } else {
 439                 /* EEPROM value is a regpair value */
 440                 if (rd != CTRY_DEFAULT)
 441                         printk(KERN_DEBUG "ath: EEPROM indicates we "
 442                                "should expect a direct regpair map\n");
 443                 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
 444                         if (regDomainPairs[i].regDmnEnum == rd)
 445                                 return true;
 446         }
 447         printk(KERN_DEBUG
 448                  "ath: invalid regulatory domain/country code 0x%x\n", rd);
 449         return false;
 450 }
 451
 452 /* EEPROM country code to regpair mapping */
 453 static struct country_code_to_enum_rd*
 454 ath_regd_find_country(u16 countryCode)
 455 {
 456         int i;
 457
 458         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 459                 if (allCountries[i].countryCode == countryCode)
 460                         return &allCountries[i];
 461         }
 462         return NULL;
 463 }
 464
 465 /* EEPROM rd code to regpair mapping */
 466 static struct country_code_to_enum_rd*
 467 ath_regd_find_country_by_rd(int regdmn)
 468 {
 469         int i;
 470
 471         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 472                 if (allCountries[i].regDmnEnum == regdmn)
 473                         return &allCountries[i];
 474         }
 475         return NULL;
 476 }
 477
 478 /* Returns the map of the EEPROM set RD to a country code */
 479 static u16 ath_regd_get_default_country(u16 rd)
 480 {
 481         if (rd & COUNTRY_ERD_FLAG) {
 482                 struct country_code_to_enum_rd *country = NULL;
 483                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 484
 485                 country = ath_regd_find_country(cc);
 486                 if (country != NULL)
 487                         return cc;
 488         }
 489
 490         return CTRY_DEFAULT;
 491 }
 492
 493 static struct reg_dmn_pair_mapping*
 494 ath_get_regpair(int regdmn)
 495 {
 496         int i;
 497
 498         if (regdmn == NO_ENUMRD)
 499                 return NULL;
 500         for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
 501                 if (regDomainPairs[i].regDmnEnum == regdmn)
 502                         return &regDomainPairs[i];
 503         }
 504         return NULL;
 505 }
 506
 507 static int
 508 ath_regd_init_wiphy(struct ath_regulatory *reg,
 509                     struct wiphy *wiphy,
 510                     int (*reg_notifier)(struct wiphy *wiphy,
 511                                         struct regulatory_request *request))
 512 {
 513         const struct ieee80211_regdomain *regd;
 514
 515         wiphy->reg_notifier = reg_notifier;
 516         wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
 517
 518         if (ath_is_world_regd(reg)) {
 519                 /*
 520                  * Anything applied here (prior to wiphy registration) gets
 521                  * saved on the wiphy orig_* parameters
 522                  */
 523                 regd = ath_world_regdomain(reg);
 524                 wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
 525         } else {
 526                 /*
 527                  * This gets applied in the case of the absence of CRDA,
 528                  * it's our own custom world regulatory domain, similar to
 529                  * cfg80211's but we enable passive scanning.
 530                  */
 531                 regd = ath_default_world_regdomain();
 532         }
 533         wiphy_apply_custom_regulatory(wiphy, regd);
 534         ath_reg_apply_radar_flags(wiphy);
 535         ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 536         return 0;
 537 }
 538
 539 /*
 540  * Some users have reported their EEPROM programmed with
 541  * 0x8000 set, this is not a supported regulatory domain
 542  * but since we have more than one user with it we need
 543  * a solution for them. We default to 0x64, which is the
 544  * default Atheros world regulatory domain.
 545  */
 546 static void ath_regd_sanitize(struct ath_regulatory *reg)
 547 {
 548         if (reg->current_rd != COUNTRY_ERD_FLAG)
 549                 return;
 550         printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
 551         reg->current_rd = 0x64;
 552 }
 553
 554 static int __ath_regd_init(struct ath_regulatory *reg)
 555 {
 556         struct country_code_to_enum_rd *country = NULL;
 557         u16 regdmn;
 558
 559         if (!reg)
 560                 return -EINVAL;
 561
 562         ath_regd_sanitize(reg);
 563
 564         printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);
 565
 566         if (!ath_regd_is_eeprom_valid(reg)) {
 567                 pr_err("Invalid EEPROM contents\n");
 568                 return -EINVAL;
 569         }
 570
 571         regdmn = ath_regd_get_eepromRD(reg);
 572         reg->country_code = ath_regd_get_default_country(regdmn);
 573
 574         if (reg->country_code == CTRY_DEFAULT &&
 575             regdmn == CTRY_DEFAULT) {
 576                 printk(KERN_DEBUG "ath: EEPROM indicates default "
 577                        "country code should be used\n");
 578                 reg->country_code = CTRY_UNITED_STATES;
 579         }
 580
 581         if (reg->country_code == CTRY_DEFAULT) {
 582                 country = NULL;
 583         } else {
 584                 printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
 585                        "map search\n");
 586                 country = ath_regd_find_country(reg->country_code);
 587                 if (country == NULL) {
 588                         printk(KERN_DEBUG
 589                                 "ath: no valid country maps found for "
 590                                 "country code: 0x%0x\n",
 591                                 reg->country_code);
 592                         return -EINVAL;
 593                 } else {
 594                         regdmn = country->regDmnEnum;
 595                         printk(KERN_DEBUG "ath: country maps to "
 596                                "regdmn code: 0x%0x\n",
 597                                regdmn);
 598                 }
 599         }
 600
 601         reg->regpair = ath_get_regpair(regdmn);
 602
 603         if (!reg->regpair) {
 604                 printk(KERN_DEBUG "ath: "
 605                         "No regulatory domain pair found, cannot continue\n");
 606                 return -EINVAL;
 607         }
 608
 609         if (!country)
 610                 country = ath_regd_find_country_by_rd(regdmn);
 611
 612         if (country) {
 613                 reg->alpha2[0] = country->isoName[0];
 614                 reg->alpha2[1] = country->isoName[1];
 615         } else {
 616                 reg->alpha2[0] = '0';
 617                 reg->alpha2[1] = '0';
 618         }
 619
 620         printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
 621                 reg->alpha2[0], reg->alpha2[1]);
 622         printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
 623                 reg->regpair->regDmnEnum);
 624
 625         return 0;
 626 }
 627
 628 int
 629 ath_regd_init(struct ath_regulatory *reg,
 630               struct wiphy *wiphy,
 631               int (*reg_notifier)(struct wiphy *wiphy,
 632                                   struct regulatory_request *request))
 633 {
 634         struct ath_common *common = container_of(reg, struct ath_common,
 635                                                  regulatory);
 636         int r;
 637
 638         r = __ath_regd_init(reg);
 639         if (r)
 640                 return r;
 641
 642         if (ath_is_world_regd(reg))
 643                 memcpy(&common->reg_world_copy, reg,
 644                        sizeof(struct ath_regulatory));
 645
 646         ath_regd_init_wiphy(reg, wiphy, reg_notifier);
 647
 648         return 0;
 649 }
 650 EXPORT_SYMBOL(ath_regd_init);
 651
 652 u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
 653                           enum ieee80211_band band)
 654 {
 655         if (!reg->regpair ||
 656             (reg->country_code == CTRY_DEFAULT &&
 657              is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
 658                 return SD_NO_CTL;
 659         }
 660
 661         switch (band) {
 662         case IEEE80211_BAND_2GHZ:
 663                 return reg->regpair->reg_2ghz_ctl;
 664         case IEEE80211_BAND_5GHZ:
 665                 return reg->regpair->reg_5ghz_ctl;
 666         default:
 667                 return NO_CTL;
 668         }
 669 }
 670 EXPORT_SYMBOL(ath_regd_get_band_ctl);