drivers/staging/rtl8821ae/regd.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2009-2010  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 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0))
 162         u32 bandwidth = 0;
 163         int r;
 164 #endif
 165
 166         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 167
 168                 if (!wiphy->bands[band])
 169                         continue;
 170
 171                 sband = wiphy->bands[band];
 172
 173                 for (i = 0; i < sband->n_channels; i++) {
 174                         ch = &sband->channels[i];
 175                         if (_rtl_is_radar_freq(ch->center_freq) ||
 176                             (ch->flags & IEEE80211_CHAN_RADAR))
 177                                 continue;
 178                         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 179 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
 180                                 reg_rule = freq_reg_info(wiphy, ch->center_freq);
 181                                 if (IS_ERR(reg_rule))
 182                                         continue;
 183 #else
 184                                 r = freq_reg_info(wiphy, ch->center_freq,
 185                                                   bandwidth, &reg_rule);
 186                                 if (r)
 187                                         continue;
 188 #endif
 189
 190                                 /*
 191                                  *If 11d had a rule for this channel ensure
 192                                  *we enable adhoc/beaconing if it allows us to
 193                                  *use it. Note that we would have disabled it
 194                                  *by applying our static world regdomain by
 195                                  *default during init, prior to calling our
 196                                  *regulatory_hint().
 197                                  */
 198
 199                                 if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
 200                                         ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
 201                                 if (!(reg_rule->flags &
 202                                       NL80211_RRF_PASSIVE_SCAN))
 203                                         ch->flags &=
 204                                             ~IEEE80211_CHAN_PASSIVE_SCAN;
 205                         } else {
 206                                 if (ch->beacon_found)
 207                                         ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 208                                                    IEEE80211_CHAN_PASSIVE_SCAN);
 209                         }
 210                 }
 211         }
 212 }
 213
 214 /* Allows active scan scan on Ch 12 and 13 */
 215 static void _rtl_reg_apply_active_scan_flags(struct wiphy *wiphy,
 216                                              enum nl80211_reg_initiator
 217                                              initiator)
 218 {
 219         struct ieee80211_supported_band *sband;
 220         struct ieee80211_channel *ch;
 221         const struct ieee80211_reg_rule *reg_rule;
 222 #if (LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0))
 223         u32 bandwidth = 0;
 224         int r;
 225 #endif
 226
 227         if (!wiphy->bands[IEEE80211_BAND_2GHZ])
 228                 return;
 229         sband = wiphy->bands[IEEE80211_BAND_2GHZ];
 230
 231         /*
 232          *If no country IE has been received always enable active scan
 233          *on these channels. This is only done for specific regulatory SKUs
 234          */
 235         if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 236                 ch = &sband->channels[11];      /* CH 12 */
 237                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 238                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 239                 ch = &sband->channels[12];      /* CH 13 */
 240                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 241                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 242                 return;
 243         }
 244
 245         /*
 246          *If a country IE has been received check its rule for this
 247          *channel first before enabling active scan. The passive scan
 248          *would have been enforced by the initial processing of our
 249          *custom regulatory domain.
 250          */
 251
 252         ch = &sband->channels[11];      /* CH 12 */
 253 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
 254         reg_rule = freq_reg_info(wiphy, ch->center_freq);
 255         if (!IS_ERR(reg_rule)) {
 256 #else
 257         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 258         if (!r) {
 259 #endif
 260                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 261                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 262                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 263         }
 264
 265         ch = &sband->channels[12];      /* CH 13 */
 266 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
 267         reg_rule = freq_reg_info(wiphy, ch->center_freq);
 268         if (!IS_ERR(reg_rule)) {
 269 #else
 270         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 271         if (!r) {
 272 #endif
 273                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 274                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 275                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 276         }
 277 }
 278
 279 /*
 280  *Always apply Radar/DFS rules on
 281  *freq range 5260 MHz - 5700 MHz
 282  */
 283 static void _rtl_reg_apply_radar_flags(struct wiphy *wiphy)
 284 {
 285         struct ieee80211_supported_band *sband;
 286         struct ieee80211_channel *ch;
 287         unsigned int i;
 288
 289         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 290                 return;
 291
 292         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 293
 294         for (i = 0; i < sband->n_channels; i++) {
 295                 ch = &sband->channels[i];
 296                 if (!_rtl_is_radar_freq(ch->center_freq))
 297                         continue;
 298
 299                 /*
 300                  *We always enable radar detection/DFS on this
 301                  *frequency range. Additionally we also apply on
 302                  *this frequency range:
 303                  *- If STA mode does not yet have DFS supports disable
 304                  * active scanning
 305                  *- If adhoc mode does not support DFS yet then disable
 306                  * adhoc in the frequency.
 307                  *- If AP mode does not yet support radar detection/DFS
 308                  *do not allow AP mode
 309                  */
 310                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 311                         ch->flags |= IEEE80211_CHAN_RADAR |
 312                             IEEE80211_CHAN_NO_IBSS |
 313                             IEEE80211_CHAN_PASSIVE_SCAN;
 314         }
 315 }
 316
 317 static void _rtl_reg_apply_world_flags(struct wiphy *wiphy,
 318                                        enum nl80211_reg_initiator initiator,
 319                                        struct rtl_regulatory *reg)
 320 {
 321         _rtl_reg_apply_beaconing_flags(wiphy, initiator);
 322         _rtl_reg_apply_active_scan_flags(wiphy, initiator);
 323         return;
 324 }
 325
 326 static void _rtl_dump_channel_map(struct wiphy *wiphy)
 327 {
 328         enum ieee80211_band band;
 329         struct ieee80211_supported_band *sband;
 330         struct ieee80211_channel *ch;
 331         unsigned int i;
 332
 333         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 334                 if (!wiphy->bands[band])
 335                         continue;
 336                 sband = wiphy->bands[band];
 337                 for (i = 0; i < sband->n_channels; i++)
 338                         ch = &sband->channels[i];
 339         }
 340 }
 341
 342 static int _rtl_reg_notifier_apply(struct wiphy *wiphy,
 343                                    struct regulatory_request *request,
 344                                    struct rtl_regulatory *reg)
 345 {
 346         /* We always apply this */
 347         _rtl_reg_apply_radar_flags(wiphy);
 348
 349         switch (request->initiator) {
 350         case NL80211_REGDOM_SET_BY_DRIVER:
 351         case NL80211_REGDOM_SET_BY_CORE:
 352         case NL80211_REGDOM_SET_BY_USER:
 353                 break;
 354         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 355                 _rtl_reg_apply_world_flags(wiphy, request->initiator, reg);
 356                 break;
 357         }
 358
 359         _rtl_dump_channel_map(wiphy);
 360
 361         return 0;
 362 }
 363
 364 static const struct ieee80211_regdomain *_rtl_regdomain_select(
 365                                                 struct rtl_regulatory *reg)
 366 {
 367         switch (reg->country_code) {
 368         case COUNTRY_CODE_FCC:
 369                 return &rtl_regdom_no_midband;
 370         case COUNTRY_CODE_IC:
 371                 return &rtl_regdom_11;
 372         case COUNTRY_CODE_ETSI:
 373         case COUNTRY_CODE_TELEC_NETGEAR:
 374                 return &rtl_regdom_60_64;
 375         case COUNTRY_CODE_SPAIN:
 376         case COUNTRY_CODE_FRANCE:
 377         case COUNTRY_CODE_ISRAEL:
 378         case COUNTRY_CODE_WORLD_WIDE_13:
 379                 return &rtl_regdom_12_13;
 380         case COUNTRY_CODE_MKK:
 381         case COUNTRY_CODE_MKK1:
 382         case COUNTRY_CODE_TELEC:
 383         case COUNTRY_CODE_MIC:
 384                 return &rtl_regdom_14_60_64;
 385         case COUNTRY_CODE_GLOBAL_DOMAIN:
 386                 return &rtl_regdom_14;
 387         default:
 388                 return &rtl_regdom_no_midband;
 389         }
 390 }
 391
 392 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
 393 static int _rtl_regd_init_wiphy(struct rtl_regulatory *reg,
 394                                 struct wiphy *wiphy,
 395                                 void (*reg_notifier) (struct wiphy * wiphy,
 396                                                      struct regulatory_request *
 397                                                      request))
 398 #else
 399 static int _rtl_regd_init_wiphy(struct rtl_regulatory *reg,
 400                                 struct wiphy *wiphy,
 401                                 int (*reg_notifier) (struct wiphy * wiphy,
 402                                                      struct regulatory_request *
 403                                                      request))
 404 #endif
 405 {
 406         const struct ieee80211_regdomain *regd;
 407
 408         wiphy->reg_notifier = reg_notifier;
 409
 410         wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
 411         wiphy->flags &= ~WIPHY_FLAG_STRICT_REGULATORY;
 412         wiphy->flags &= ~WIPHY_FLAG_DISABLE_BEACON_HINTS;
 413
 414         regd = _rtl_regdomain_select(reg);
 415         wiphy_apply_custom_regulatory(wiphy, regd);
 416         _rtl_reg_apply_radar_flags(wiphy);
 417         _rtl_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 418         return 0;
 419 }
 420
 421 static struct country_code_to_enum_rd *_rtl_regd_find_country(u16 countrycode)
 422 {
 423         int i;
 424
 425         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 426                 if (allCountries[i].countrycode == countrycode)
 427                         return &allCountries[i];
 428         }
 429         return NULL;
 430 }
 431
 432 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
 433 int rtl_regd_init(struct ieee80211_hw *hw,
 434                   void (*reg_notifier) (struct wiphy *wiphy,
 435                                         struct regulatory_request *request))
 436 #else
 437 int rtl_regd_init(struct ieee80211_hw *hw,
 438                   int (*reg_notifier) (struct wiphy *wiphy,
 439                                        struct regulatory_request *request))
 440 #endif
 441 {
 442         struct rtl_priv *rtlpriv = rtl_priv(hw);
 443         struct wiphy *wiphy = hw->wiphy;
 444         struct country_code_to_enum_rd *country = NULL;
 445
 446         if (wiphy == NULL || &rtlpriv->regd == NULL)
 447                 return -EINVAL;
 448
 449         /* init country_code from efuse channel plan */
 450         rtlpriv->regd.country_code = rtlpriv->efuse.channel_plan;
 451
 452         RT_TRACE(COMP_REGD, DBG_TRACE,
 453                  (KERN_DEBUG "rtl: EEPROM regdomain: 0x%0x\n",
 454                   rtlpriv->regd.country_code));
 455
 456         if (rtlpriv->regd.country_code >= COUNTRY_CODE_MAX) {
 457                 RT_TRACE(COMP_REGD, DBG_DMESG,
 458                          (KERN_DEBUG "rtl: EEPROM indicates invalid country code"
 459                           "world wide 13 should be used\n"));
 460
 461                 rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
 462         }
 463
 464         country = _rtl_regd_find_country(rtlpriv->regd.country_code);
 465
 466         if (country) {
 467                 rtlpriv->regd.alpha2[0] = country->iso_name[0];
 468                 rtlpriv->regd.alpha2[1] = country->iso_name[1];
 469         } else {
 470                 rtlpriv->regd.alpha2[0] = '0';
 471                 rtlpriv->regd.alpha2[1] = '0';
 472         }
 473
 474         RT_TRACE(COMP_REGD, DBG_TRACE,
 475                  (KERN_DEBUG "rtl: Country alpha2 being used: %c%c\n",
 476                   rtlpriv->regd.alpha2[0], rtlpriv->regd.alpha2[1]));
 477
 478         _rtl_regd_init_wiphy(&rtlpriv->regd, wiphy, reg_notifier);
 479
 480         return 0;
 481 }
 482
 483 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
 484 void rtl_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 485 {
 486         struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 487         struct rtl_priv *rtlpriv = rtl_priv(hw);
 488
 489         RT_TRACE(COMP_REGD, DBG_LOUD, ("\n"));
 490
 491         _rtl_reg_notifier_apply(wiphy, request, &rtlpriv->regd);
 492 }
 493 #else
 494 int rtl_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 495 {
 496         struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 497         struct rtl_priv *rtlpriv = rtl_priv(hw);
 498
 499         RT_TRACE(COMP_REGD, DBG_LOUD, ("\n"));
 500
 501         return _rtl_reg_notifier_apply(wiphy, request, &rtlpriv->regd);
 502 }
 503 #endif