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_NO_IR)
  41 #define ATH9K_2GHZ_CH14         REG_RULE(2484-10, 2484+10, 40, 0, 20,\
  42                                          NL80211_RRF_NO_IR | \
  43                                          NL80211_RRF_NO_OFDM)
  44
  45 /* We allow IBSS on these on a case by case basis by regulatory domain */
  46 #define ATH9K_5GHZ_5150_5350    REG_RULE(5150-10, 5350+10, 80, 0, 30,\
  47                                          NL80211_RRF_NO_IR)
  48 #define ATH9K_5GHZ_5470_5850    REG_RULE(5470-10, 5850+10, 80, 0, 30,\
  49                                          NL80211_RRF_NO_IR)
  50 #define ATH9K_5GHZ_5725_5850    REG_RULE(5725-10, 5850+10, 80, 0, 30,\
  51                                          NL80211_RRF_NO_IR)
  52
  53 #define ATH9K_2GHZ_ALL          ATH9K_2GHZ_CH01_11, \
  54                                 ATH9K_2GHZ_CH12_13, \
  55                                 ATH9K_2GHZ_CH14
  56
  57 #define ATH9K_5GHZ_ALL          ATH9K_5GHZ_5150_5350, \
  58                                 ATH9K_5GHZ_5470_5850
  59
  60 /* This one skips what we call "mid band" */
  61 #define ATH9K_5GHZ_NO_MIDBAND   ATH9K_5GHZ_5150_5350, \
  62                                 ATH9K_5GHZ_5725_5850
  63
  64 /* Can be used for:
  65  * 0x60, 0x61, 0x62 */
  66 static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
  67         .n_reg_rules = 5,
  68         .alpha2 =  "99",
  69         .reg_rules = {
  70                 ATH9K_2GHZ_ALL,
  71                 ATH9K_5GHZ_ALL,
  72         }
  73 };
  74
  75 /* Can be used by 0x63 and 0x65 */
  76 static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
  77         .n_reg_rules = 4,
  78         .alpha2 =  "99",
  79         .reg_rules = {
  80                 ATH9K_2GHZ_CH01_11,
  81                 ATH9K_2GHZ_CH12_13,
  82                 ATH9K_5GHZ_NO_MIDBAND,
  83         }
  84 };
  85
  86 /* Can be used by 0x64 only */
  87 static const struct ieee80211_regdomain ath_world_regdom_64 = {
  88         .n_reg_rules = 3,
  89         .alpha2 =  "99",
  90         .reg_rules = {
  91                 ATH9K_2GHZ_CH01_11,
  92                 ATH9K_5GHZ_NO_MIDBAND,
  93         }
  94 };
  95
  96 /* Can be used by 0x66 and 0x69 */
  97 static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
  98         .n_reg_rules = 3,
  99         .alpha2 =  "99",
 100         .reg_rules = {
 101                 ATH9K_2GHZ_CH01_11,
 102                 ATH9K_5GHZ_ALL,
 103         }
 104 };
 105
 106 /* Can be used by 0x67, 0x68, 0x6A and 0x6C */
 107 static const struct ieee80211_regdomain ath_world_regdom_67_68_6A_6C = {
 108         .n_reg_rules = 4,
 109         .alpha2 =  "99",
 110         .reg_rules = {
 111                 ATH9K_2GHZ_CH01_11,
 112                 ATH9K_2GHZ_CH12_13,
 113                 ATH9K_5GHZ_ALL,
 114         }
 115 };
 116
 117 static bool dynamic_country_user_possible(struct ath_regulatory *reg)
 118 {
 119         if (IS_ENABLED(CONFIG_ATH_REG_DYNAMIC_USER_CERT_TESTING))
 120                 return true;
 121
 122         switch (reg->country_code) {
 123         case CTRY_UNITED_STATES:
 124         case CTRY_JAPAN1:
 125         case CTRY_JAPAN2:
 126         case CTRY_JAPAN3:
 127         case CTRY_JAPAN4:
 128         case CTRY_JAPAN5:
 129         case CTRY_JAPAN6:
 130         case CTRY_JAPAN7:
 131         case CTRY_JAPAN8:
 132         case CTRY_JAPAN9:
 133         case CTRY_JAPAN10:
 134         case CTRY_JAPAN11:
 135         case CTRY_JAPAN12:
 136         case CTRY_JAPAN13:
 137         case CTRY_JAPAN14:
 138         case CTRY_JAPAN15:
 139         case CTRY_JAPAN16:
 140         case CTRY_JAPAN17:
 141         case CTRY_JAPAN18:
 142         case CTRY_JAPAN19:
 143         case CTRY_JAPAN20:
 144         case CTRY_JAPAN21:
 145         case CTRY_JAPAN22:
 146         case CTRY_JAPAN23:
 147         case CTRY_JAPAN24:
 148         case CTRY_JAPAN25:
 149         case CTRY_JAPAN26:
 150         case CTRY_JAPAN27:
 151         case CTRY_JAPAN28:
 152         case CTRY_JAPAN29:
 153         case CTRY_JAPAN30:
 154         case CTRY_JAPAN31:
 155         case CTRY_JAPAN32:
 156         case CTRY_JAPAN33:
 157         case CTRY_JAPAN34:
 158         case CTRY_JAPAN35:
 159         case CTRY_JAPAN36:
 160         case CTRY_JAPAN37:
 161         case CTRY_JAPAN38:
 162         case CTRY_JAPAN39:
 163         case CTRY_JAPAN40:
 164         case CTRY_JAPAN41:
 165         case CTRY_JAPAN42:
 166         case CTRY_JAPAN43:
 167         case CTRY_JAPAN44:
 168         case CTRY_JAPAN45:
 169         case CTRY_JAPAN46:
 170         case CTRY_JAPAN47:
 171         case CTRY_JAPAN48:
 172         case CTRY_JAPAN49:
 173         case CTRY_JAPAN50:
 174         case CTRY_JAPAN51:
 175         case CTRY_JAPAN52:
 176         case CTRY_JAPAN53:
 177         case CTRY_JAPAN54:
 178         case CTRY_JAPAN55:
 179         case CTRY_JAPAN56:
 180         case CTRY_JAPAN57:
 181         case CTRY_JAPAN58:
 182         case CTRY_JAPAN59:
 183                 return false;
 184         }
 185
 186         return true;
 187 }
 188
 189 static bool ath_reg_dyn_country_user_allow(struct ath_regulatory *reg)
 190 {
 191         if (!IS_ENABLED(CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS))
 192                 return false;
 193         if (!dynamic_country_user_possible(reg))
 194                 return false;
 195         return true;
 196 }
 197
 198 static inline bool is_wwr_sku(u16 regd)
 199 {
 200         return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) &&
 201                 (((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
 202                 (regd == WORLD));
 203 }
 204
 205 static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
 206 {
 207         return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
 208 }
 209
 210 bool ath_is_world_regd(struct ath_regulatory *reg)
 211 {
 212         return is_wwr_sku(ath_regd_get_eepromRD(reg));
 213 }
 214 EXPORT_SYMBOL(ath_is_world_regd);
 215
 216 static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
 217 {
 218         /* this is the most restrictive */
 219         return &ath_world_regdom_64;
 220 }
 221
 222 static const struct
 223 ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
 224 {
 225         switch (reg->regpair->reg_domain) {
 226         case 0x60:
 227         case 0x61:
 228         case 0x62:
 229                 return &ath_world_regdom_60_61_62;
 230         case 0x63:
 231         case 0x65:
 232                 return &ath_world_regdom_63_65;
 233         case 0x64:
 234                 return &ath_world_regdom_64;
 235         case 0x66:
 236         case 0x69:
 237                 return &ath_world_regdom_66_69;
 238         case 0x67:
 239         case 0x68:
 240         case 0x6A:
 241         case 0x6C:
 242                 return &ath_world_regdom_67_68_6A_6C;
 243         default:
 244                 WARN_ON(1);
 245                 return ath_default_world_regdomain();
 246         }
 247 }
 248
 249 bool ath_is_49ghz_allowed(u16 regdomain)
 250 {
 251         /* possibly more */
 252         return regdomain == MKK9_MKKC;
 253 }
 254 EXPORT_SYMBOL(ath_is_49ghz_allowed);
 255
 256 /* Frequency is one where radar detection is required */
 257 static bool ath_is_radar_freq(u16 center_freq,
 258                               struct ath_regulatory *reg)
 259
 260 {
 261         if (reg->country_code == CTRY_INDIA)
 262                 return (center_freq >= 5500 && center_freq <= 5700);
 263         return (center_freq >= 5260 && center_freq <= 5700);
 264 }
 265
 266 static void ath_force_clear_no_ir_chan(struct wiphy *wiphy,
 267                                        struct ieee80211_channel *ch)
 268 {
 269         const struct ieee80211_reg_rule *reg_rule;
 270
 271         reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(ch->center_freq));
 272         if (IS_ERR(reg_rule))
 273                 return;
 274
 275         if (!(reg_rule->flags & NL80211_RRF_NO_IR))
 276                 if (ch->flags & IEEE80211_CHAN_NO_IR)
 277                         ch->flags &= ~IEEE80211_CHAN_NO_IR;
 278 }
 279
 280 static void ath_force_clear_no_ir_freq(struct wiphy *wiphy, u16 center_freq)
 281 {
 282         struct ieee80211_channel *ch;
 283
 284         ch = ieee80211_get_channel(wiphy, center_freq);
 285         if (!ch)
 286                 return;
 287
 288         ath_force_clear_no_ir_chan(wiphy, ch);
 289 }
 290
 291 static void ath_force_no_ir_chan(struct ieee80211_channel *ch)
 292 {
 293         ch->flags |= IEEE80211_CHAN_NO_IR;
 294 }
 295
 296 static void ath_force_no_ir_freq(struct wiphy *wiphy, u16 center_freq)
 297 {
 298         struct ieee80211_channel *ch;
 299
 300         ch = ieee80211_get_channel(wiphy, center_freq);
 301         if (!ch)
 302                 return;
 303
 304         ath_force_no_ir_chan(ch);
 305 }
 306
 307 static void
 308 __ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
 309                                 struct ath_regulatory *reg,
 310                                 enum nl80211_reg_initiator initiator,
 311                                 struct ieee80211_channel *ch)
 312 {
 313         if (ath_is_radar_freq(ch->center_freq, reg) ||
 314             (ch->flags & IEEE80211_CHAN_RADAR))
 315                 return;
 316
 317         switch (initiator) {
 318         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 319                 ath_force_clear_no_ir_chan(wiphy, ch);
 320                 break;
 321         case NL80211_REGDOM_SET_BY_USER:
 322                 if (ath_reg_dyn_country_user_allow(reg))
 323                         ath_force_clear_no_ir_chan(wiphy, ch);
 324                 break;
 325         default:
 326                 if (ch->beacon_found)
 327                         ch->flags &= ~IEEE80211_CHAN_NO_IR;
 328         }
 329 }
 330
 331 /*
 332  * These exception rules do not apply radar frequencies.
 333  *
 334  * - We enable initiating radiation if the country IE says its fine:
 335  * - If no country IE has been processed and a we determine we have
 336  *   received a beacon on a channel we can enable initiating radiation.
 337  */
 338 static void
 339 ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
 340                               struct ath_regulatory *reg,
 341                               enum nl80211_reg_initiator initiator)
 342 {
 343         enum nl80211_band band;
 344         struct ieee80211_supported_band *sband;
 345         struct ieee80211_channel *ch;
 346         unsigned int i;
 347
 348         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 349                 if (!wiphy->bands[band])
 350                         continue;
 351                 sband = wiphy->bands[band];
 352                 for (i = 0; i < sband->n_channels; i++) {
 353                         ch = &sband->channels[i];
 354                         __ath_reg_apply_beaconing_flags(wiphy, reg,
 355                                                         initiator, ch);
 356                 }
 357         }
 358 }
 359
 360 /**
 361  * ath_reg_apply_ir_flags()
 362  * @wiphy: the wiphy to use
 363  * @initiator: the regulatory hint initiator
 364  *
 365  * If no country IE has been received always enable passive scan
 366  * and no-ibss on these channels. This is only done for specific
 367  * regulatory SKUs.
 368  *
 369  * If a country IE has been received check its rule for this
 370  * channel first before enabling active scan. The passive scan
 371  * would have been enforced by the initial processing of our
 372  * custom regulatory domain.
 373  */
 374 static void
 375 ath_reg_apply_ir_flags(struct wiphy *wiphy,
 376                        struct ath_regulatory *reg,
 377                        enum nl80211_reg_initiator initiator)
 378 {
 379         struct ieee80211_supported_band *sband;
 380
 381         sband = wiphy->bands[NL80211_BAND_2GHZ];
 382         if (!sband)
 383                 return;
 384
 385         switch(initiator) {
 386         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 387                 ath_force_clear_no_ir_freq(wiphy, 2467);
 388                 ath_force_clear_no_ir_freq(wiphy, 2472);
 389                 break;
 390         case NL80211_REGDOM_SET_BY_USER:
 391                 if (!ath_reg_dyn_country_user_allow(reg))
 392                         break;
 393                 ath_force_clear_no_ir_freq(wiphy, 2467);
 394                 ath_force_clear_no_ir_freq(wiphy, 2472);
 395                 break;
 396         default:
 397                 ath_force_no_ir_freq(wiphy, 2467);
 398                 ath_force_no_ir_freq(wiphy, 2472);
 399         }
 400 }
 401
 402 /* Always apply Radar/DFS rules on freq range 5500 MHz - 5700 MHz */
 403 static void ath_reg_apply_radar_flags(struct wiphy *wiphy,
 404                                       struct ath_regulatory *reg)
 405 {
 406         struct ieee80211_supported_band *sband;
 407         struct ieee80211_channel *ch;
 408         unsigned int i;
 409
 410         if (!wiphy->bands[NL80211_BAND_5GHZ])
 411                 return;
 412
 413         sband = wiphy->bands[NL80211_BAND_5GHZ];
 414
 415         for (i = 0; i < sband->n_channels; i++) {
 416                 ch = &sband->channels[i];
 417                 if (!ath_is_radar_freq(ch->center_freq, reg))
 418                         continue;
 419                 /* We always enable radar detection/DFS on this
 420                  * frequency range. Additionally we also apply on
 421                  * this frequency range:
 422                  * - If STA mode does not yet have DFS supports disable
 423                  *   active scanning
 424                  * - If adhoc mode does not support DFS yet then
 425                  *   disable adhoc in the frequency.
 426                  * - If AP mode does not yet support radar detection/DFS
 427                  *   do not allow AP mode
 428                  */
 429                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 430                         ch->flags |= IEEE80211_CHAN_RADAR |
 431                                      IEEE80211_CHAN_NO_IR;
 432         }
 433 }
 434
 435 static void ath_reg_apply_world_flags(struct wiphy *wiphy,
 436                                       enum nl80211_reg_initiator initiator,
 437                                       struct ath_regulatory *reg)
 438 {
 439         switch (reg->regpair->reg_domain) {
 440         case 0x60:
 441         case 0x63:
 442         case 0x66:
 443         case 0x67:
 444         case 0x6C:
 445                 ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
 446                 break;
 447         case 0x68:
 448                 ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
 449                 ath_reg_apply_ir_flags(wiphy, reg, initiator);
 450                 break;
 451         default:
 452                 if (ath_reg_dyn_country_user_allow(reg))
 453                         ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
 454         }
 455 }
 456
 457 u16 ath_regd_find_country_by_name(char *alpha2)
 458 {
 459         unsigned int i;
 460
 461         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 462                 if (!memcmp(allCountries[i].isoName, alpha2, 2))
 463                         return allCountries[i].countryCode;
 464         }
 465
 466         return -1;
 467 }
 468 EXPORT_SYMBOL(ath_regd_find_country_by_name);
 469
 470 static int __ath_reg_dyn_country(struct wiphy *wiphy,
 471                                  struct ath_regulatory *reg,
 472                                  struct regulatory_request *request)
 473 {
 474         u16 country_code;
 475
 476         if (request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
 477             !ath_is_world_regd(reg))
 478                 return -EINVAL;
 479
 480         country_code = ath_regd_find_country_by_name(request->alpha2);
 481         if (country_code == (u16) -1)
 482                 return -EINVAL;
 483
 484         reg->current_rd = COUNTRY_ERD_FLAG;
 485         reg->current_rd |= country_code;
 486
 487         __ath_regd_init(reg);
 488
 489         ath_reg_apply_world_flags(wiphy, request->initiator, reg);
 490
 491         return 0;
 492 }
 493
 494 static void ath_reg_dyn_country(struct wiphy *wiphy,
 495                                 struct ath_regulatory *reg,
 496                                 struct regulatory_request *request)
 497 {
 498         if (__ath_reg_dyn_country(wiphy, reg, request))
 499                 return;
 500
 501         printk(KERN_DEBUG "ath: regdomain 0x%0x "
 502                           "dynamically updated by %s\n",
 503                reg->current_rd,
 504                reg_initiator_name(request->initiator));
 505 }
 506
 507 void ath_reg_notifier_apply(struct wiphy *wiphy,
 508                             struct regulatory_request *request,
 509                             struct ath_regulatory *reg)
 510 {
 511         struct ath_common *common = container_of(reg, struct ath_common,
 512                                                  regulatory);
 513         /* We always apply this */
 514         ath_reg_apply_radar_flags(wiphy, reg);
 515
 516         /*
 517          * This would happen when we have sent a custom regulatory request
 518          * a world regulatory domain and the scheduler hasn't yet processed
 519          * any pending requests in the queue.
 520          */
 521         if (!request)
 522                 return;
 523
 524         reg->region = request->dfs_region;
 525         switch (request->initiator) {
 526         case NL80211_REGDOM_SET_BY_CORE:
 527                 /*
 528                  * If common->reg_world_copy is world roaming it means we *were*
 529                  * world roaming... so we now have to restore that data.
 530                  */
 531                 if (!ath_is_world_regd(&common->reg_world_copy))
 532                         break;
 533
 534                 memcpy(reg, &common->reg_world_copy,
 535                        sizeof(struct ath_regulatory));
 536                 break;
 537         case NL80211_REGDOM_SET_BY_DRIVER:
 538                 break;
 539         case NL80211_REGDOM_SET_BY_USER:
 540                 if (ath_reg_dyn_country_user_allow(reg))
 541                         ath_reg_dyn_country(wiphy, reg, request);
 542                 break;
 543         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 544                 ath_reg_dyn_country(wiphy, reg, request);
 545                 break;
 546         }
 547 }
 548 EXPORT_SYMBOL(ath_reg_notifier_apply);
 549
 550 static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
 551 {
 552         u16 rd = ath_regd_get_eepromRD(reg);
 553         int i;
 554
 555         if (rd & COUNTRY_ERD_FLAG) {
 556                 /* EEPROM value is a country code */
 557                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 558                 printk(KERN_DEBUG
 559                        "ath: EEPROM indicates we should expect "
 560                         "a country code\n");
 561                 for (i = 0; i < ARRAY_SIZE(allCountries); i++)
 562                         if (allCountries[i].countryCode == cc)
 563                                 return true;
 564         } else {
 565                 /* EEPROM value is a regpair value */
 566                 if (rd != CTRY_DEFAULT)
 567                         printk(KERN_DEBUG "ath: EEPROM indicates we "
 568                                "should expect a direct regpair map\n");
 569                 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
 570                         if (regDomainPairs[i].reg_domain == rd)
 571                                 return true;
 572         }
 573         printk(KERN_DEBUG
 574                  "ath: invalid regulatory domain/country code 0x%x\n", rd);
 575         return false;
 576 }
 577
 578 /* EEPROM country code to regpair mapping */
 579 static struct country_code_to_enum_rd*
 580 ath_regd_find_country(u16 countryCode)
 581 {
 582         int i;
 583
 584         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 585                 if (allCountries[i].countryCode == countryCode)
 586                         return &allCountries[i];
 587         }
 588         return NULL;
 589 }
 590
 591 /* EEPROM rd code to regpair mapping */
 592 static struct country_code_to_enum_rd*
 593 ath_regd_find_country_by_rd(int regdmn)
 594 {
 595         int i;
 596
 597         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 598                 if (allCountries[i].regDmnEnum == regdmn)
 599                         return &allCountries[i];
 600         }
 601         return NULL;
 602 }
 603
 604 /* Returns the map of the EEPROM set RD to a country code */
 605 static u16 ath_regd_get_default_country(u16 rd)
 606 {
 607         if (rd & COUNTRY_ERD_FLAG) {
 608                 struct country_code_to_enum_rd *country = NULL;
 609                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 610
 611                 country = ath_regd_find_country(cc);
 612                 if (country != NULL)
 613                         return cc;
 614         }
 615
 616         return CTRY_DEFAULT;
 617 }
 618
 619 static struct reg_dmn_pair_mapping*
 620 ath_get_regpair(int regdmn)
 621 {
 622         int i;
 623
 624         if (regdmn == NO_ENUMRD)
 625                 return NULL;
 626         for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
 627                 if (regDomainPairs[i].reg_domain == regdmn)
 628                         return &regDomainPairs[i];
 629         }
 630         return NULL;
 631 }
 632
 633 static int
 634 ath_regd_init_wiphy(struct ath_regulatory *reg,
 635                     struct wiphy *wiphy,
 636                     void (*reg_notifier)(struct wiphy *wiphy,
 637                                          struct regulatory_request *request))
 638 {
 639         const struct ieee80211_regdomain *regd;
 640
 641         wiphy->reg_notifier = reg_notifier;
 642         wiphy->regulatory_flags |= REGULATORY_STRICT_REG |
 643                                    REGULATORY_CUSTOM_REG;
 644
 645         if (ath_is_world_regd(reg)) {
 646                 /*
 647                  * Anything applied here (prior to wiphy registration) gets
 648                  * saved on the wiphy orig_* parameters
 649                  */
 650                 regd = ath_world_regdomain(reg);
 651                 wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_FOLLOW_POWER;
 652         } else {
 653                 /*
 654                  * This gets applied in the case of the absence of CRDA,
 655                  * it's our own custom world regulatory domain, similar to
 656                  * cfg80211's but we enable passive scanning.
 657                  */
 658                 regd = ath_default_world_regdomain();
 659         }
 660
 661         wiphy_apply_custom_regulatory(wiphy, regd);
 662         ath_reg_apply_radar_flags(wiphy, reg);
 663         ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 664         return 0;
 665 }
 666
 667 /*
 668  * Some users have reported their EEPROM programmed with
 669  * 0x8000 set, this is not a supported regulatory domain
 670  * but since we have more than one user with it we need
 671  * a solution for them. We default to 0x64, which is the
 672  * default Atheros world regulatory domain.
 673  */
 674 static void ath_regd_sanitize(struct ath_regulatory *reg)
 675 {
 676         if (reg->current_rd != COUNTRY_ERD_FLAG)
 677                 return;
 678         printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
 679         reg->current_rd = 0x64;
 680 }
 681
 682 static int __ath_regd_init(struct ath_regulatory *reg)
 683 {
 684         struct country_code_to_enum_rd *country = NULL;
 685         u16 regdmn;
 686
 687         if (!reg)
 688                 return -EINVAL;
 689
 690         ath_regd_sanitize(reg);
 691
 692         printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);
 693
 694         if (!ath_regd_is_eeprom_valid(reg)) {
 695                 pr_err("Invalid EEPROM contents\n");
 696                 return -EINVAL;
 697         }
 698
 699         regdmn = ath_regd_get_eepromRD(reg);
 700         reg->country_code = ath_regd_get_default_country(regdmn);
 701
 702         if (reg->country_code == CTRY_DEFAULT &&
 703             regdmn == CTRY_DEFAULT) {
 704                 printk(KERN_DEBUG "ath: EEPROM indicates default "
 705                        "country code should be used\n");
 706                 reg->country_code = CTRY_UNITED_STATES;
 707         }
 708
 709         if (reg->country_code == CTRY_DEFAULT) {
 710                 country = NULL;
 711         } else {
 712                 printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
 713                        "map search\n");
 714                 country = ath_regd_find_country(reg->country_code);
 715                 if (country == NULL) {
 716                         printk(KERN_DEBUG
 717                                 "ath: no valid country maps found for "
 718                                 "country code: 0x%0x\n",
 719                                 reg->country_code);
 720                         return -EINVAL;
 721                 } else {
 722                         regdmn = country->regDmnEnum;
 723                         printk(KERN_DEBUG "ath: country maps to "
 724                                "regdmn code: 0x%0x\n",
 725                                regdmn);
 726                 }
 727         }
 728
 729         reg->regpair = ath_get_regpair(regdmn);
 730
 731         if (!reg->regpair) {
 732                 printk(KERN_DEBUG "ath: "
 733                         "No regulatory domain pair found, cannot continue\n");
 734                 return -EINVAL;
 735         }
 736
 737         if (!country)
 738                 country = ath_regd_find_country_by_rd(regdmn);
 739
 740         if (country) {
 741                 reg->alpha2[0] = country->isoName[0];
 742                 reg->alpha2[1] = country->isoName[1];
 743         } else {
 744                 reg->alpha2[0] = '0';
 745                 reg->alpha2[1] = '0';
 746         }
 747
 748         printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
 749                 reg->alpha2[0], reg->alpha2[1]);
 750         printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
 751                 reg->regpair->reg_domain);
 752
 753         return 0;
 754 }
 755
 756 int
 757 ath_regd_init(struct ath_regulatory *reg,
 758               struct wiphy *wiphy,
 759               void (*reg_notifier)(struct wiphy *wiphy,
 760                                    struct regulatory_request *request))
 761 {
 762         struct ath_common *common = container_of(reg, struct ath_common,
 763                                                  regulatory);
 764         int r;
 765
 766         r = __ath_regd_init(reg);
 767         if (r)
 768                 return r;
 769
 770         if (ath_is_world_regd(reg))
 771                 memcpy(&common->reg_world_copy, reg,
 772                        sizeof(struct ath_regulatory));
 773
 774         ath_regd_init_wiphy(reg, wiphy, reg_notifier);
 775
 776         return 0;
 777 }
 778 EXPORT_SYMBOL(ath_regd_init);
 779
 780 u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
 781                           enum nl80211_band band)
 782 {
 783         if (!reg->regpair ||
 784             (reg->country_code == CTRY_DEFAULT &&
 785              is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
 786                 return SD_NO_CTL;
 787         }
 788
 789         if (ath_regd_get_eepromRD(reg) == CTRY_DEFAULT) {
 790                 switch (reg->region) {
 791                 case NL80211_DFS_FCC:
 792                         return CTL_FCC;
 793                 case NL80211_DFS_ETSI:
 794                         return CTL_ETSI;
 795                 case NL80211_DFS_JP:
 796                         return CTL_MKK;
 797                 default:
 798                         break;
 799                 }
 800         }
 801
 802         switch (band) {
 803         case NL80211_BAND_2GHZ:
 804                 return reg->regpair->reg_2ghz_ctl;
 805         case NL80211_BAND_5GHZ:
 806                 return reg->regpair->reg_5ghz_ctl;
 807         default:
 808                 return NO_CTL;
 809         }
 810 }
 811 EXPORT_SYMBOL(ath_regd_get_band_ctl);