drivers/net/wireless/ath9k/regd.c

   1 /*
   2  * Copyright (c) 2008 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/slab.h>
  19 #include "ath9k.h"
  20 #include "regd_common.h"
  21
  22 /*
  23  * This is a set of common rules used by our world regulatory domains.
  24  * We have 12 world regulatory domains. To save space we consolidate
  25  * the regulatory domains in 5 structures by frequency and change
  26  * the flags on our reg_notifier() on a case by case basis.
  27  */
  28
  29 /* Only these channels all allow active scan on all world regulatory domains */
  30 #define ATH9K_2GHZ_CH01_11      REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
  31
  32 /* We enable active scan on these a case by case basis by regulatory domain */
  33 #define ATH9K_2GHZ_CH12_13      REG_RULE(2467-10, 2472+10, 40, 0, 20,\
  34                                         NL80211_RRF_PASSIVE_SCAN)
  35 #define ATH9K_2GHZ_CH14         REG_RULE(2484-10, 2484+10, 40, 0, 20,\
  36                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_OFDM)
  37
  38 /* We allow IBSS on these on a case by case basis by regulatory domain */
  39 #define ATH9K_5GHZ_5150_5350    REG_RULE(5150-10, 5350+10, 40, 0, 30,\
  40                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  41 #define ATH9K_5GHZ_5470_5850    REG_RULE(5470-10, 5850+10, 40, 0, 30,\
  42                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  43 #define ATH9K_5GHZ_5725_5850    REG_RULE(5725-10, 5850+10, 40, 0, 30,\
  44                                 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
  45
  46 #define ATH9K_2GHZ_ALL          ATH9K_2GHZ_CH01_11, \
  47                                 ATH9K_2GHZ_CH12_13, \
  48                                 ATH9K_2GHZ_CH14
  49
  50 #define ATH9K_5GHZ_ALL          ATH9K_5GHZ_5150_5350, \
  51                                 ATH9K_5GHZ_5470_5850
  52 /* This one skips what we call "mid band" */
  53 #define ATH9K_5GHZ_NO_MIDBAND   ATH9K_5GHZ_5150_5350, \
  54                                 ATH9K_5GHZ_5725_5850
  55
  56 /* Can be used for:
  57  * 0x60, 0x61, 0x62 */
  58 static const struct ieee80211_regdomain ath9k_world_regdom_60_61_62 = {
  59         .n_reg_rules = 5,
  60         .alpha2 =  "99",
  61         .reg_rules = {
  62                 ATH9K_2GHZ_ALL,
  63                 ATH9K_5GHZ_ALL,
  64         }
  65 };
  66
  67 /* Can be used by 0x63 and 0x65 */
  68 static const struct ieee80211_regdomain ath9k_world_regdom_63_65 = {
  69         .n_reg_rules = 4,
  70         .alpha2 =  "99",
  71         .reg_rules = {
  72                 ATH9K_2GHZ_CH01_11,
  73                 ATH9K_2GHZ_CH12_13,
  74                 ATH9K_5GHZ_NO_MIDBAND,
  75         }
  76 };
  77
  78 /* Can be used by 0x64 only */
  79 static const struct ieee80211_regdomain ath9k_world_regdom_64 = {
  80         .n_reg_rules = 3,
  81         .alpha2 =  "99",
  82         .reg_rules = {
  83                 ATH9K_2GHZ_CH01_11,
  84                 ATH9K_5GHZ_NO_MIDBAND,
  85         }
  86 };
  87
  88 /* Can be used by 0x66 and 0x69 */
  89 static const struct ieee80211_regdomain ath9k_world_regdom_66_69 = {
  90         .n_reg_rules = 3,
  91         .alpha2 =  "99",
  92         .reg_rules = {
  93                 ATH9K_2GHZ_CH01_11,
  94                 ATH9K_5GHZ_ALL,
  95         }
  96 };
  97
  98 /* Can be used by 0x67, 0x6A and 0x68 */
  99 static const struct ieee80211_regdomain ath9k_world_regdom_67_68_6A = {
 100         .n_reg_rules = 4,
 101         .alpha2 =  "99",
 102         .reg_rules = {
 103                 ATH9K_2GHZ_CH01_11,
 104                 ATH9K_2GHZ_CH12_13,
 105                 ATH9K_5GHZ_ALL,
 106         }
 107 };
 108
 109 static u16 ath9k_regd_get_eepromRD(struct ath_hw *ah)
 110 {
 111         return ah->regulatory.current_rd & ~WORLDWIDE_ROAMING_FLAG;
 112 }
 113
 114 u16 ath9k_regd_get_rd(struct ath_hw *ah)
 115 {
 116         return ath9k_regd_get_eepromRD(ah);
 117 }
 118
 119 bool ath9k_is_world_regd(struct ath_hw *ah)
 120 {
 121         return isWwrSKU(ah);
 122 }
 123
 124 const struct ieee80211_regdomain *ath9k_default_world_regdomain(void)
 125 {
 126         /* this is the most restrictive */
 127         return &ath9k_world_regdom_64;
 128 }
 129
 130 const struct ieee80211_regdomain *ath9k_world_regdomain(struct ath_hw *ah)
 131 {
 132         switch (ah->regulatory.regpair->regDmnEnum) {
 133         case 0x60:
 134         case 0x61:
 135         case 0x62:
 136                 return &ath9k_world_regdom_60_61_62;
 137         case 0x63:
 138         case 0x65:
 139                 return &ath9k_world_regdom_63_65;
 140         case 0x64:
 141                 return &ath9k_world_regdom_64;
 142         case 0x66:
 143         case 0x69:
 144                 return &ath9k_world_regdom_66_69;
 145         case 0x67:
 146         case 0x68:
 147         case 0x6A:
 148                 return &ath9k_world_regdom_67_68_6A;
 149         default:
 150                 WARN_ON(1);
 151                 return ath9k_default_world_regdomain();
 152         }
 153 }
 154
 155 /* Frequency is one where radar detection is required */
 156 static bool ath9k_is_radar_freq(u16 center_freq)
 157 {
 158         return (center_freq >= 5260 && center_freq <= 5700);
 159 }
 160
 161 /*
 162  * Enable adhoc on 5 GHz if allowed by 11d.
 163  * Remove passive scan if channel is allowed by 11d,
 164  * except when on radar frequencies.
 165  */
 166 static void ath9k_reg_apply_5ghz_beaconing_flags(struct wiphy *wiphy,
 167                                              enum reg_set_by setby)
 168 {
 169         struct ieee80211_supported_band *sband;
 170         const struct ieee80211_reg_rule *reg_rule;
 171         struct ieee80211_channel *ch;
 172         unsigned int i;
 173         u32 bandwidth = 0;
 174         int r;
 175
 176         if (setby != REGDOM_SET_BY_COUNTRY_IE)
 177                 return;
 178         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 179                 return;
 180
 181         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 182         for (i = 0; i < sband->n_channels; i++) {
 183                 ch = &sband->channels[i];
 184                 r = freq_reg_info(wiphy, ch->center_freq,
 185                         &bandwidth, &reg_rule);
 186                 if (r)
 187                         continue;
 188                 /* If 11d had a rule for this channel ensure we enable adhoc
 189                  * if it allows us to use it. Note that we would have disabled
 190                  * it by applying our static world regdomain by default during
 191                  * probe */
 192                 if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
 193                         ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
 194                 if (!ath9k_is_radar_freq(ch->center_freq))
 195                         continue;
 196                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 197                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 198         }
 199 }
 200
 201 /* Allows active scan scan on Ch 12 and 13 */
 202 static void ath9k_reg_apply_active_scan_flags(struct wiphy *wiphy,
 203                                               enum reg_set_by setby)
 204 {
 205         struct ieee80211_supported_band *sband;
 206         struct ieee80211_channel *ch;
 207         const struct ieee80211_reg_rule *reg_rule;
 208         u32 bandwidth = 0;
 209         int r;
 210
 211         /* Force passive scan on Channels 12-13 */
 212         sband = wiphy->bands[IEEE80211_BAND_2GHZ];
 213
 214         /* If no country IE has been received always enable active scan
 215          * on these channels */
 216         if (setby != REGDOM_SET_BY_COUNTRY_IE) {
 217                 ch = &sband->channels[11]; /* CH 12 */
 218                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 219                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 220                 ch = &sband->channels[12]; /* CH 13 */
 221                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 222                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 223                 return;
 224         }
 225
 226         /* If a country IE has been recieved check its rule for this
 227          * channel first before enabling active scan. The passive scan
 228          * would have been enforced by the initial probe processing on
 229          * our custom regulatory domain. */
 230
 231         ch = &sband->channels[11]; /* CH 12 */
 232         r = freq_reg_info(wiphy, ch->center_freq, &bandwidth, &reg_rule);
 233         if (!r) {
 234                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 235                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 236                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 237         }
 238
 239         ch = &sband->channels[12]; /* CH 13 */
 240         r = freq_reg_info(wiphy, ch->center_freq, &bandwidth, &reg_rule);
 241         if (!r) {
 242                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 243                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 244                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 245         }
 246 }
 247
 248 /* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
 249 void ath9k_reg_apply_radar_flags(struct wiphy *wiphy)
 250 {
 251         struct ieee80211_supported_band *sband;
 252         struct ieee80211_channel *ch;
 253         unsigned int i;
 254
 255         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 256                 return;
 257
 258         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 259
 260         for (i = 0; i < sband->n_channels; i++) {
 261                 ch = &sband->channels[i];
 262                 if (!ath9k_is_radar_freq(ch->center_freq))
 263                         continue;
 264                 /* We always enable radar detection/DFS on this
 265                  * frequency range. Additionally we also apply on
 266                  * this frequency range:
 267                  * - If STA mode does not yet have DFS supports disable
 268                  *   active scanning
 269                  * - If adhoc mode does not support DFS yet then
 270                  *   disable adhoc in the frequency.
 271                  * - If AP mode does not yet support radar detection/DFS
 272                  *   do not allow AP mode
 273                  */
 274                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 275                         ch->flags |= IEEE80211_CHAN_RADAR |
 276                                      IEEE80211_CHAN_NO_IBSS |
 277                                      IEEE80211_CHAN_PASSIVE_SCAN;
 278         }
 279 }
 280
 281 void ath9k_reg_apply_world_flags(struct wiphy *wiphy, enum reg_set_by setby)
 282 {
 283         struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 284         struct ath_softc *sc = hw->priv;
 285         struct ath_hw *ah = sc->sc_ah;
 286
 287         switch (ah->regulatory.regpair->regDmnEnum) {
 288         case 0x60:
 289         case 0x63:
 290         case 0x66:
 291         case 0x67:
 292                 ath9k_reg_apply_5ghz_beaconing_flags(wiphy, setby);
 293                 break;
 294         case 0x68:
 295                 ath9k_reg_apply_5ghz_beaconing_flags(wiphy, setby);
 296                 ath9k_reg_apply_active_scan_flags(wiphy, setby);
 297                 break;
 298         }
 299         return;
 300 }
 301
 302 int ath9k_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 303 {
 304         struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 305         struct ath_softc *sc = hw->priv;
 306
 307         /* We always apply this */
 308         ath9k_reg_apply_radar_flags(wiphy);
 309
 310         switch (request->initiator) {
 311         case REGDOM_SET_BY_DRIVER:
 312         case REGDOM_SET_BY_INIT:
 313         case REGDOM_SET_BY_CORE:
 314         case REGDOM_SET_BY_USER:
 315                 break;
 316         case REGDOM_SET_BY_COUNTRY_IE:
 317                 if (ath9k_is_world_regd(sc->sc_ah))
 318                         ath9k_reg_apply_world_flags(wiphy, request->initiator);
 319                 break;
 320         }
 321
 322         return 0;
 323 }
 324
 325 bool ath9k_regd_is_eeprom_valid(struct ath_hw *ah)
 326 {
 327         u16 rd = ath9k_regd_get_eepromRD(ah);
 328         int i;
 329
 330         if (rd & COUNTRY_ERD_FLAG) {
 331                 /* EEPROM value is a country code */
 332                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 333                 for (i = 0; i < ARRAY_SIZE(allCountries); i++)
 334                         if (allCountries[i].countryCode == cc)
 335                                 return true;
 336         } else {
 337                 /* EEPROM value is a regpair value */
 338                 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
 339                         if (regDomainPairs[i].regDmnEnum == rd)
 340                                 return true;
 341         }
 342         DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
 343                  "invalid regulatory domain/country code 0x%x\n", rd);
 344         return false;
 345 }
 346
 347 /* EEPROM country code to regpair mapping */
 348 static struct country_code_to_enum_rd*
 349 ath9k_regd_find_country(u16 countryCode)
 350 {
 351         int i;
 352
 353         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 354                 if (allCountries[i].countryCode == countryCode)
 355                         return &allCountries[i];
 356         }
 357         return NULL;
 358 }
 359
 360 /* EEPROM rd code to regpair mapping */
 361 static struct country_code_to_enum_rd*
 362 ath9k_regd_find_country_by_rd(int regdmn)
 363 {
 364         int i;
 365
 366         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 367                 if (allCountries[i].regDmnEnum == regdmn)
 368                         return &allCountries[i];
 369         }
 370         return NULL;
 371 }
 372
 373 /* Returns the map of the EEPROM set RD to a country code */
 374 static u16 ath9k_regd_get_default_country(struct ath_hw *ah)
 375 {
 376         u16 rd;
 377
 378         rd = ath9k_regd_get_eepromRD(ah);
 379         if (rd & COUNTRY_ERD_FLAG) {
 380                 struct country_code_to_enum_rd *country = NULL;
 381                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 382
 383                 country = ath9k_regd_find_country(cc);
 384                 if (country != NULL)
 385                         return cc;
 386         }
 387
 388         return CTRY_DEFAULT;
 389 }
 390
 391 static struct reg_dmn_pair_mapping*
 392 ath9k_get_regpair(int regdmn)
 393 {
 394         int i;
 395
 396         if (regdmn == NO_ENUMRD)
 397                 return NULL;
 398         for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
 399                 if (regDomainPairs[i].regDmnEnum == regdmn)
 400                         return &regDomainPairs[i];
 401         }
 402         return NULL;
 403 }
 404
 405 int ath9k_regd_init(struct ath_hw *ah)
 406 {
 407         struct country_code_to_enum_rd *country = NULL;
 408         int regdmn;
 409
 410         if (!ath9k_regd_is_eeprom_valid(ah)) {
 411                 DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
 412                         "Invalid EEPROM contents\n");
 413                 return -EINVAL;
 414         }
 415
 416         ah->regulatory.country_code = ath9k_regd_get_default_country(ah);
 417
 418         if (ah->regulatory.country_code == CTRY_DEFAULT &&
 419             ath9k_regd_get_eepromRD(ah) == CTRY_DEFAULT)
 420                 ah->regulatory.country_code = CTRY_UNITED_STATES;
 421
 422         if (ah->regulatory.country_code == CTRY_DEFAULT) {
 423                 regdmn = ath9k_regd_get_eepromRD(ah);
 424                 country = NULL;
 425         } else {
 426                 country = ath9k_regd_find_country(ah->regulatory.country_code);
 427                 if (country == NULL) {
 428                         DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
 429                                 "Country is NULL!!!!, cc= %d\n",
 430                                 ah->regulatory.country_code);
 431                         return -EINVAL;
 432                 } else
 433                         regdmn = country->regDmnEnum;
 434         }
 435
 436         ah->regulatory.regpair = ath9k_get_regpair(regdmn);
 437
 438         if (!ah->regulatory.regpair) {
 439                 DPRINTF(ah->ah_sc, ATH_DBG_FATAL,
 440                         "No regulatory domain pair found, cannot continue\n");
 441                 return -EINVAL;
 442         }
 443
 444         if (!country)
 445                 country = ath9k_regd_find_country_by_rd(regdmn);
 446
 447         if (country) {
 448                 ah->regulatory.alpha2[0] = country->isoName[0];
 449                 ah->regulatory.alpha2[1] = country->isoName[1];
 450         } else {
 451                 ah->regulatory.alpha2[0] = '0';
 452                 ah->regulatory.alpha2[1] = '0';
 453         }
 454
 455         DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
 456                 "Country alpha2 being used: %c%c\n"
 457                 "Regulatory.Regpair detected: 0x%0x\n",
 458                 ah->regulatory.alpha2[0], ah->regulatory.alpha2[1],
 459                 ah->regulatory.regpair->regDmnEnum);
 460
 461         return 0;
 462 }
 463
 464 u32 ath9k_regd_get_ctl(struct ath_hw *ah, struct ath9k_channel *chan)
 465 {
 466         u32 ctl = NO_CTL;
 467
 468         if (!ah->regulatory.regpair ||
 469             (ah->regulatory.country_code == CTRY_DEFAULT && isWwrSKU(ah))) {
 470                 if (IS_CHAN_B(chan))
 471                         ctl = SD_NO_CTL | CTL_11B;
 472                 else if (IS_CHAN_G(chan))
 473                         ctl = SD_NO_CTL | CTL_11G;
 474                 else
 475                         ctl = SD_NO_CTL | CTL_11A;
 476                 return ctl;
 477         }
 478
 479         if (IS_CHAN_B(chan))
 480                 ctl = ah->regulatory.regpair->reg_2ghz_ctl | CTL_11B;
 481         else if (IS_CHAN_G(chan))
 482                 ctl = ah->regulatory.regpair->reg_5ghz_ctl | CTL_11G;
 483         else
 484                 ctl = ah->regulatory.regpair->reg_5ghz_ctl | CTL_11A;
 485
 486         return ctl;
 487 }