drivers/net/wireless/rtlwifi/regd.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2009-2012  Realtek Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of version 2 of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * wlanfae <wlanfae@realtek.com>
  23  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
  24  * Hsinchu 300, Taiwan.
  25  *
  26  * Larry Finger <Larry.Finger@lwfinger.net>
  27  *
  28  *****************************************************************************/
  29
  30 #include "wifi.h"
  31 #include "regd.h"
  32
  33 static struct country_code_to_enum_rd allCountries[] = {
  34         {COUNTRY_CODE_FCC, "US"},
  35         {COUNTRY_CODE_IC, "US"},
  36         {COUNTRY_CODE_ETSI, "EC"},
  37         {COUNTRY_CODE_SPAIN, "EC"},
  38         {COUNTRY_CODE_FRANCE, "EC"},
  39         {COUNTRY_CODE_MKK, "JP"},
  40         {COUNTRY_CODE_MKK1, "JP"},
  41         {COUNTRY_CODE_ISRAEL, "EC"},
  42         {COUNTRY_CODE_TELEC, "JP"},
  43         {COUNTRY_CODE_MIC, "JP"},
  44         {COUNTRY_CODE_GLOBAL_DOMAIN, "JP"},
  45         {COUNTRY_CODE_WORLD_WIDE_13, "EC"},
  46         {COUNTRY_CODE_TELEC_NETGEAR, "EC"},
  47 };
  48
  49 /*
  50  *Only these channels all allow active
  51  *scan on all world regulatory domains
  52  */
  53 #define RTL819x_2GHZ_CH01_11    \
  54         REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
  55
  56 /*
  57  *We enable active scan on these a case
  58  *by case basis by regulatory domain
  59  */
  60 #define RTL819x_2GHZ_CH12_13    \
  61         REG_RULE(2467-10, 2472+10, 40, 0, 20,\
  62         NL80211_RRF_PASSIVE_SCAN)
  63
  64 #define RTL819x_2GHZ_CH14       \
  65         REG_RULE(2484-10, 2484+10, 40, 0, 20, \
  66         NL80211_RRF_PASSIVE_SCAN | \
  67         NL80211_RRF_NO_OFDM)
  68
  69 /* 5G chan 36 - chan 64*/
  70 #define RTL819x_5GHZ_5150_5350  \
  71         REG_RULE(5150-10, 5350+10, 40, 0, 30, \
  72         NL80211_RRF_PASSIVE_SCAN | \
  73         NL80211_RRF_NO_IBSS)
  74
  75 /* 5G chan 100 - chan 165*/
  76 #define RTL819x_5GHZ_5470_5850  \
  77         REG_RULE(5470-10, 5850+10, 40, 0, 30, \
  78         NL80211_RRF_PASSIVE_SCAN | \
  79         NL80211_RRF_NO_IBSS)
  80
  81 /* 5G chan 149 - chan 165*/
  82 #define RTL819x_5GHZ_5725_5850  \
  83         REG_RULE(5725-10, 5850+10, 40, 0, 30, \
  84         NL80211_RRF_PASSIVE_SCAN | \
  85         NL80211_RRF_NO_IBSS)
  86
  87 #define RTL819x_5GHZ_ALL        \
  88         (RTL819x_5GHZ_5150_5350, RTL819x_5GHZ_5470_5850)
  89
  90 static const struct ieee80211_regdomain rtl_regdom_11 = {
  91         .n_reg_rules = 1,
  92         .alpha2 = "99",
  93         .reg_rules = {
  94                       RTL819x_2GHZ_CH01_11,
  95                       }
  96 };
  97
  98 static const struct ieee80211_regdomain rtl_regdom_12_13 = {
  99         .n_reg_rules = 2,
 100         .alpha2 = "99",
 101         .reg_rules = {
 102                       RTL819x_2GHZ_CH01_11,
 103                           RTL819x_2GHZ_CH12_13,
 104                       }
 105 };
 106
 107 static const struct ieee80211_regdomain rtl_regdom_no_midband = {
 108         .n_reg_rules = 3,
 109         .alpha2 = "99",
 110         .reg_rules = {
 111                       RTL819x_2GHZ_CH01_11,
 112                           RTL819x_5GHZ_5150_5350,
 113                           RTL819x_5GHZ_5725_5850,
 114                       }
 115 };
 116
 117 static const struct ieee80211_regdomain rtl_regdom_60_64 = {
 118         .n_reg_rules = 3,
 119         .alpha2 = "99",
 120         .reg_rules = {
 121                       RTL819x_2GHZ_CH01_11,
 122                           RTL819x_2GHZ_CH12_13,
 123                           RTL819x_5GHZ_5725_5850,
 124                       }
 125 };
 126
 127 static const struct ieee80211_regdomain rtl_regdom_14_60_64 = {
 128         .n_reg_rules = 4,
 129         .alpha2 = "99",
 130         .reg_rules = {
 131                       RTL819x_2GHZ_CH01_11,
 132                           RTL819x_2GHZ_CH12_13,
 133                           RTL819x_2GHZ_CH14,
 134                           RTL819x_5GHZ_5725_5850,
 135                       }
 136 };
 137
 138 static const struct ieee80211_regdomain rtl_regdom_14 = {
 139         .n_reg_rules = 3,
 140         .alpha2 = "99",
 141         .reg_rules = {
 142                       RTL819x_2GHZ_CH01_11,
 143                           RTL819x_2GHZ_CH12_13,
 144                           RTL819x_2GHZ_CH14,
 145                       }
 146 };
 147
 148 static bool _rtl_is_radar_freq(u16 center_freq)
 149 {
 150         return (center_freq >= 5260 && center_freq <= 5700);
 151 }
 152
 153 static void _rtl_reg_apply_beaconing_flags(struct wiphy *wiphy,
 154                                            enum nl80211_reg_initiator initiator)
 155 {
 156         enum ieee80211_band band;
 157         struct ieee80211_supported_band *sband;
 158         const struct ieee80211_reg_rule *reg_rule;
 159         struct ieee80211_channel *ch;
 160         unsigned int i;
 161         u32 bandwidth = 0;
 162         int r;
 163
 164         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 165
 166                 if (!wiphy->bands[band])
 167                         continue;
 168
 169                 sband = wiphy->bands[band];
 170
 171                 for (i = 0; i < sband->n_channels; i++) {
 172                         ch = &sband->channels[i];
 173                         if (_rtl_is_radar_freq(ch->center_freq) ||
 174                             (ch->flags & IEEE80211_CHAN_RADAR))
 175                                 continue;
 176                         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 177                                 r = freq_reg_info(wiphy, ch->center_freq,
 178                                                   bandwidth, &reg_rule);
 179                                 if (r)
 180                                         continue;
 181
 182                                 /*
 183                                  *If 11d had a rule for this channel ensure
 184                                  *we enable adhoc/beaconing if it allows us to
 185                                  *use it. Note that we would have disabled it
 186                                  *by applying our static world regdomain by
 187                                  *default during init, prior to calling our
 188                                  *regulatory_hint().
 189                                  */
 190
 191                                 if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
 192                                         ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
 193                                 if (!(reg_rule->
 194                                      flags & NL80211_RRF_PASSIVE_SCAN))
 195                                         ch->flags &=
 196                                             ~IEEE80211_CHAN_PASSIVE_SCAN;
 197                         } else {
 198                                 if (ch->beacon_found)
 199                                         ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 200                                                   IEEE80211_CHAN_PASSIVE_SCAN);
 201                         }
 202                 }
 203         }
 204 }
 205
 206 /* Allows active scan scan on Ch 12 and 13 */
 207 static void _rtl_reg_apply_active_scan_flags(struct wiphy *wiphy,
 208                                              enum nl80211_reg_initiator
 209                                              initiator)
 210 {
 211         struct ieee80211_supported_band *sband;
 212         struct ieee80211_channel *ch;
 213         const struct ieee80211_reg_rule *reg_rule;
 214         u32 bandwidth = 0;
 215         int r;
 216
 217         if (!wiphy->bands[IEEE80211_BAND_2GHZ])
 218                 return;
 219         sband = wiphy->bands[IEEE80211_BAND_2GHZ];
 220
 221         /*
 222          *If no country IE has been received always enable active scan
 223          *on these channels. This is only done for specific regulatory SKUs
 224          */
 225         if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 226                 ch = &sband->channels[11];      /* CH 12 */
 227                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 228                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 229                 ch = &sband->channels[12];      /* CH 13 */
 230                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 231                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 232                 return;
 233         }
 234
 235         /*
 236          *If a country IE has been received check its rule for this
 237          *channel first before enabling active scan. The passive scan
 238          *would have been enforced by the initial processing of our
 239          *custom regulatory domain.
 240          */
 241
 242         ch = &sband->channels[11];      /* CH 12 */
 243         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 244         if (!r) {
 245                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 246                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 247                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 248         }
 249
 250         ch = &sband->channels[12];      /* CH 13 */
 251         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 252         if (!r) {
 253                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 254                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 255                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 256         }
 257 }
 258
 259 /*
 260  *Always apply Radar/DFS rules on
 261  *freq range 5260 MHz - 5700 MHz
 262  */
 263 static void _rtl_reg_apply_radar_flags(struct wiphy *wiphy)
 264 {
 265         struct ieee80211_supported_band *sband;
 266         struct ieee80211_channel *ch;
 267         unsigned int i;
 268
 269         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 270                 return;
 271
 272         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 273
 274         for (i = 0; i < sband->n_channels; i++) {
 275                 ch = &sband->channels[i];
 276                 if (!_rtl_is_radar_freq(ch->center_freq))
 277                         continue;
 278
 279                 /*
 280                  *We always enable radar detection/DFS on this
 281                  *frequency range. Additionally we also apply on
 282                  *this frequency range:
 283                  *- If STA mode does not yet have DFS supports disable
 284                  * active scanning
 285                  *- If adhoc mode does not support DFS yet then disable
 286                  * adhoc in the frequency.
 287                  *- If AP mode does not yet support radar detection/DFS
 288                  *do not allow AP mode
 289                  */
 290                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 291                         ch->flags |= IEEE80211_CHAN_RADAR |
 292                             IEEE80211_CHAN_NO_IBSS |
 293                             IEEE80211_CHAN_PASSIVE_SCAN;
 294         }
 295 }
 296
 297 static void _rtl_reg_apply_world_flags(struct wiphy *wiphy,
 298                                        enum nl80211_reg_initiator initiator,
 299                                        struct rtl_regulatory *reg)
 300 {
 301         _rtl_reg_apply_beaconing_flags(wiphy, initiator);
 302         _rtl_reg_apply_active_scan_flags(wiphy, initiator);
 303         return;
 304 }
 305
 306 static int _rtl_reg_notifier_apply(struct wiphy *wiphy,
 307                                    struct regulatory_request *request,
 308                                    struct rtl_regulatory *reg)
 309 {
 310         /* We always apply this */
 311         _rtl_reg_apply_radar_flags(wiphy);
 312
 313         switch (request->initiator) {
 314         case NL80211_REGDOM_SET_BY_DRIVER:
 315         case NL80211_REGDOM_SET_BY_CORE:
 316         case NL80211_REGDOM_SET_BY_USER:
 317                 break;
 318         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 319                 _rtl_reg_apply_world_flags(wiphy, request->initiator, reg);
 320                 break;
 321         }
 322
 323         return 0;
 324 }
 325
 326 static const struct ieee80211_regdomain *_rtl_regdomain_select(
 327                                                struct rtl_regulatory *reg)
 328 {
 329         switch (reg->country_code) {
 330         case COUNTRY_CODE_FCC:
 331                 return &rtl_regdom_no_midband;
 332         case COUNTRY_CODE_IC:
 333                 return &rtl_regdom_11;
 334         case COUNTRY_CODE_ETSI:
 335         case COUNTRY_CODE_TELEC_NETGEAR:
 336                 return &rtl_regdom_60_64;
 337         case COUNTRY_CODE_SPAIN:
 338         case COUNTRY_CODE_FRANCE:
 339         case COUNTRY_CODE_ISRAEL:
 340         case COUNTRY_CODE_WORLD_WIDE_13:
 341                 return &rtl_regdom_12_13;
 342         case COUNTRY_CODE_MKK:
 343         case COUNTRY_CODE_MKK1:
 344         case COUNTRY_CODE_TELEC:
 345         case COUNTRY_CODE_MIC:
 346                 return &rtl_regdom_14_60_64;
 347         case COUNTRY_CODE_GLOBAL_DOMAIN:
 348                 return &rtl_regdom_14;
 349         default:
 350                 return &rtl_regdom_no_midband;
 351         }
 352 }
 353
 354 static int _rtl_regd_init_wiphy(struct rtl_regulatory *reg,
 355                                 struct wiphy *wiphy,
 356                                 int (*reg_notifier) (struct wiphy *wiphy,
 357                                                      struct regulatory_request *
 358                                                      request))
 359 {
 360         const struct ieee80211_regdomain *regd;
 361
 362         wiphy->reg_notifier = reg_notifier;
 363
 364         wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
 365         wiphy->flags &= ~WIPHY_FLAG_STRICT_REGULATORY;
 366         wiphy->flags &= ~WIPHY_FLAG_DISABLE_BEACON_HINTS;
 367
 368         regd = _rtl_regdomain_select(reg);
 369         wiphy_apply_custom_regulatory(wiphy, regd);
 370         _rtl_reg_apply_radar_flags(wiphy);
 371         _rtl_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 372         return 0;
 373 }
 374
 375 static struct country_code_to_enum_rd *_rtl_regd_find_country(u16 countrycode)
 376 {
 377         int i;
 378
 379         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 380                 if (allCountries[i].countrycode == countrycode)
 381                         return &allCountries[i];
 382         }
 383         return NULL;
 384 }
 385
 386 int rtl_regd_init(struct ieee80211_hw *hw,
 387                   int (*reg_notifier) (struct wiphy *wiphy,
 388                                        struct regulatory_request *request))
 389 {
 390         struct rtl_priv *rtlpriv = rtl_priv(hw);
 391         struct wiphy *wiphy = hw->wiphy;
 392         struct country_code_to_enum_rd *country = NULL;
 393
 394         if (wiphy == NULL || &rtlpriv->regd == NULL)
 395                 return -EINVAL;
 396
 397         /* init country_code from efuse channel plan */
 398         rtlpriv->regd.country_code = rtlpriv->efuse.channel_plan;
 399
 400         RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
 401                  "rtl: EEPROM regdomain: 0x%0x\n", rtlpriv->regd.country_code);
 402
 403         if (rtlpriv->regd.country_code >= COUNTRY_CODE_MAX) {
 404                 RT_TRACE(rtlpriv, COMP_REGD, DBG_DMESG,
 405                          "rtl: EEPROM indicates invalid contry code, world wide 13 should be used\n");
 406
 407                 rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
 408         }
 409
 410         country = _rtl_regd_find_country(rtlpriv->regd.country_code);
 411
 412         if (country) {
 413                 rtlpriv->regd.alpha2[0] = country->iso_name[0];
 414                 rtlpriv->regd.alpha2[1] = country->iso_name[1];
 415         } else {
 416                 rtlpriv->regd.alpha2[0] = '0';
 417                 rtlpriv->regd.alpha2[1] = '0';
 418         }
 419
 420         RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
 421                  "rtl: Country alpha2 being used: %c%c\n",
 422                  rtlpriv->regd.alpha2[0], rtlpriv->regd.alpha2[1]);
 423
 424         _rtl_regd_init_wiphy(&rtlpriv->regd, wiphy, reg_notifier);
 425
 426         return 0;
 427 }
 428
 429 int rtl_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 430 {
 431         struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 432         struct rtl_priv *rtlpriv = rtl_priv(hw);
 433
 434         RT_TRACE(rtlpriv, COMP_REGD, DBG_LOUD, "\n");
 435
 436         return _rtl_reg_notifier_apply(wiphy, request, &rtlpriv->regd);
 437 }