drivers/staging/rtl8192ee/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  * The full GNU General Public License is included in this distribution in the
  15  * file called LICENSE.
  16  *
  17  * Contact Information:
  18  * wlanfae <wlanfae@realtek.com>
  19  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
  20  * Hsinchu 300, Taiwan.
  21  *
  22  * Larry Finger <Larry.Finger@lwfinger.net>
  23  *
  24  *****************************************************************************/
  25
  26 #include "wifi.h"
  27 #include "regd.h"
  28
  29 static struct country_code_to_enum_rd allcountries[] = {
  30         {COUNTRY_CODE_FCC, "US"},
  31         {COUNTRY_CODE_IC, "US"},
  32         {COUNTRY_CODE_ETSI, "EC"},
  33         {COUNTRY_CODE_SPAIN, "EC"},
  34         {COUNTRY_CODE_FRANCE, "EC"},
  35         {COUNTRY_CODE_MKK, "JP"},
  36         {COUNTRY_CODE_MKK1, "JP"},
  37         {COUNTRY_CODE_ISRAEL, "EC"},
  38         {COUNTRY_CODE_TELEC, "JP"},
  39         {COUNTRY_CODE_MIC, "JP"},
  40         {COUNTRY_CODE_GLOBAL_DOMAIN, "JP"},
  41         {COUNTRY_CODE_WORLD_WIDE_13, "EC"},
  42         {COUNTRY_CODE_TELEC_NETGEAR, "EC"},
  43 };
  44
  45 /*
  46  *Only these channels all allow active
  47  *scan on all world regulatory domains
  48  */
  49 #define RTL819x_2GHZ_CH01_11    \
  50         REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
  51
  52 /*
  53  *We enable active scan on these a case
  54  *by case basis by regulatory domain
  55  */
  56 #define RTL819x_2GHZ_CH12_13    \
  57         REG_RULE(2467-10, 2472+10, 40, 0, 20,\
  58         NL80211_RRF_PASSIVE_SCAN)
  59
  60 #define RTL819x_2GHZ_CH14       \
  61         REG_RULE(2484-10, 2484+10, 40, 0, 20, \
  62         NL80211_RRF_PASSIVE_SCAN | \
  63         NL80211_RRF_NO_OFDM)
  64
  65 /* 5G chan 36 - chan 64*/
  66 #define RTL819x_5GHZ_5150_5350  \
  67         REG_RULE(5150-10, 5350+10, 80, 0, 30, \
  68         NL80211_RRF_PASSIVE_SCAN | \
  69         NL80211_RRF_NO_IBSS)
  70
  71 /* 5G chan 100 - chan 165*/
  72 #define RTL819x_5GHZ_5470_5850  \
  73         REG_RULE(5470-10, 5850+10, 80, 0, 30, \
  74         NL80211_RRF_PASSIVE_SCAN | \
  75         NL80211_RRF_NO_IBSS)
  76
  77 /* 5G chan 149 - chan 165*/
  78 #define RTL819x_5GHZ_5725_5850  \
  79         REG_RULE(5725-10, 5850+10, 80, 0, 30, \
  80         NL80211_RRF_PASSIVE_SCAN | \
  81         NL80211_RRF_NO_IBSS)
  82
  83 #define RTL819x_5GHZ_ALL        \
  84         (RTL819x_5GHZ_5150_5350, RTL819x_5GHZ_5470_5850)
  85
  86 static const struct ieee80211_regdomain rtl_regdom_11 = {
  87         .n_reg_rules = 1,
  88         .alpha2 = "99",
  89         .reg_rules = {
  90                       RTL819x_2GHZ_CH01_11,
  91                       }
  92 };
  93
  94 static const struct ieee80211_regdomain rtl_regdom_12_13 = {
  95         .n_reg_rules = 2,
  96         .alpha2 = "99",
  97         .reg_rules = {
  98                       RTL819x_2GHZ_CH01_11,
  99                           RTL819x_2GHZ_CH12_13,
 100                       }
 101 };
 102
 103 static const struct ieee80211_regdomain rtl_regdom_no_midband = {
 104         .n_reg_rules = 3,
 105         .alpha2 = "99",
 106         .reg_rules = {
 107                       RTL819x_2GHZ_CH01_11,
 108                           RTL819x_5GHZ_5150_5350,
 109                           RTL819x_5GHZ_5725_5850,
 110                       }
 111 };
 112
 113 static const struct ieee80211_regdomain rtl_regdom_60_64 = {
 114         .n_reg_rules = 3,
 115         .alpha2 = "99",
 116         .reg_rules = {
 117                       RTL819x_2GHZ_CH01_11,
 118                           RTL819x_2GHZ_CH12_13,
 119                           RTL819x_5GHZ_5725_5850,
 120                       }
 121 };
 122
 123 static const struct ieee80211_regdomain rtl_regdom_14_60_64 = {
 124         .n_reg_rules = 4,
 125         .alpha2 = "99",
 126         .reg_rules = {
 127                       RTL819x_2GHZ_CH01_11,
 128                           RTL819x_2GHZ_CH12_13,
 129                           RTL819x_2GHZ_CH14,
 130                           RTL819x_5GHZ_5725_5850,
 131                       }
 132 };
 133
 134 static const struct ieee80211_regdomain rtl_regdom_14 = {
 135         .n_reg_rules = 3,
 136         .alpha2 = "99",
 137         .reg_rules = {
 138                       RTL819x_2GHZ_CH01_11,
 139                           RTL819x_2GHZ_CH12_13,
 140                           RTL819x_2GHZ_CH14,
 141                       }
 142 };
 143
 144 static bool _rtl_is_radar_freq(u16 center_freq)
 145 {
 146         return center_freq >= 5260 && center_freq <= 5700;
 147 }
 148
 149 static void _rtl_reg_apply_beaconing_flags(struct wiphy *wiphy,
 150                                            enum nl80211_reg_initiator initiator)
 151 {
 152         enum ieee80211_band band;
 153         struct ieee80211_supported_band *sband;
 154         const struct ieee80211_reg_rule *reg_rule;
 155         struct ieee80211_channel *ch;
 156         unsigned int i;
 157
 158         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 159                 if (!wiphy->bands[band])
 160                         continue;
 161
 162                 sband = wiphy->bands[band];
 163
 164                 for (i = 0; i < sband->n_channels; i++) {
 165                         ch = &sband->channels[i];
 166                         if (_rtl_is_radar_freq(ch->center_freq) ||
 167                             (ch->flags & IEEE80211_CHAN_RADAR))
 168                                 continue;
 169                         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 170                                 reg_rule = freq_reg_info(wiphy,
 171                                                          ch->center_freq);
 172                                 if (IS_ERR(reg_rule))
 173                                         continue;
 174
 175                                 /*
 176                                  *If 11d had a rule for this channel ensure
 177                                  *we enable adhoc/beaconing if it allows us to
 178                                  *use it. Note that we would have disabled it
 179                                  *by applying our static world regdomain by
 180                                  *default during init, prior to calling our
 181                                  *regulatory_hint().
 182                                  */
 183
 184                                 if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
 185                                         ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
 186                                 if (!(reg_rule->flags &
 187                                       NL80211_RRF_PASSIVE_SCAN))
 188                                         ch->flags &=
 189                                             ~IEEE80211_CHAN_PASSIVE_SCAN;
 190                         } else {
 191                                 if (ch->beacon_found)
 192                                         ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 193                                                    IEEE80211_CHAN_PASSIVE_SCAN);
 194                         }
 195                 }
 196         }
 197 }
 198
 199 /* Allows active scan scan on Ch 12 and 13 */
 200 static void _rtl_reg_apply_active_scan_flags(struct wiphy *wiphy,
 201                                              enum nl80211_reg_initiator
 202                                              initiator)
 203 {
 204         struct ieee80211_supported_band *sband;
 205         struct ieee80211_channel *ch;
 206         const struct ieee80211_reg_rule *reg_rule;
 207
 208         if (!wiphy->bands[IEEE80211_BAND_2GHZ])
 209                 return;
 210         sband = wiphy->bands[IEEE80211_BAND_2GHZ];
 211
 212         /*
 213          *If no country IE has been received always enable active scan
 214          *on these channels. This is only done for specific regulatory SKUs
 215          */
 216         if (initiator != NL80211_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         /*
 227          *If a country IE has been recieved check its rule for this
 228          *channel first before enabling active scan. The passive scan
 229          *would have been enforced by the initial processing of our
 230          *custom regulatory domain.
 231          */
 232
 233         ch = &sband->channels[11];      /* CH 12 */
 234         reg_rule = freq_reg_info(wiphy, ch->center_freq);
 235         if (!IS_ERR(reg_rule)) {
 236                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 237                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 238                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 239         }
 240
 241         ch = &sband->channels[12];      /* CH 13 */
 242         reg_rule = freq_reg_info(wiphy, ch->center_freq);
 243         if (!IS_ERR(reg_rule)) {
 244                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 245                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 246                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 247         }
 248 }
 249
 250 /*
 251  *Always apply Radar/DFS rules on
 252  *freq range 5260 MHz - 5700 MHz
 253  */
 254 static void _rtl_reg_apply_radar_flags(struct wiphy *wiphy)
 255 {
 256         struct ieee80211_supported_band *sband;
 257         struct ieee80211_channel *ch;
 258         unsigned int i;
 259
 260         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 261                 return;
 262
 263         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 264
 265         for (i = 0; i < sband->n_channels; i++) {
 266                 ch = &sband->channels[i];
 267                 if (!_rtl_is_radar_freq(ch->center_freq))
 268                         continue;
 269
 270                 /*
 271                  *We always enable radar detection/DFS on this
 272                  *frequency range. Additionally we also apply on
 273                  *this frequency range:
 274                  *- If STA mode does not yet have DFS supports disable
 275                  * active scanning
 276                  *- If adhoc mode does not support DFS yet then disable
 277                  * adhoc in the frequency.
 278                  *- If AP mode does not yet support radar detection/DFS
 279                  *do not allow AP mode
 280                  */
 281                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 282                         ch->flags |= IEEE80211_CHAN_RADAR |
 283                             IEEE80211_CHAN_NO_IBSS |
 284                             IEEE80211_CHAN_PASSIVE_SCAN;
 285         }
 286 }
 287
 288 static void _rtl_reg_apply_world_flags(struct wiphy *wiphy,
 289                                        enum nl80211_reg_initiator initiator,
 290                                        struct rtl_regulatory *reg)
 291 {
 292         _rtl_reg_apply_beaconing_flags(wiphy, initiator);
 293         _rtl_reg_apply_active_scan_flags(wiphy, initiator);
 294 }
 295
 296 static void _rtl_dump_channel_map(struct wiphy *wiphy)
 297 {
 298         enum ieee80211_band band;
 299         struct ieee80211_supported_band *sband;
 300         struct ieee80211_channel *ch;
 301         unsigned int i;
 302
 303         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 304                 if (!wiphy->bands[band])
 305                         continue;
 306                 sband = wiphy->bands[band];
 307                 for (i = 0; i < sband->n_channels; i++)
 308                         ch = &sband->channels[i];
 309         }
 310 }
 311
 312 static int _rtl92e_reg_notifier_apply(struct wiphy *wiphy,
 313                                       struct regulatory_request *request,
 314                                       struct rtl_regulatory *reg)
 315 {
 316         /* We always apply this */
 317         _rtl_reg_apply_radar_flags(wiphy);
 318
 319         switch (request->initiator) {
 320         case NL80211_REGDOM_SET_BY_DRIVER:
 321         case NL80211_REGDOM_SET_BY_CORE:
 322         case NL80211_REGDOM_SET_BY_USER:
 323                 break;
 324         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 325                 _rtl_reg_apply_world_flags(wiphy, request->initiator, reg);
 326                 break;
 327         }
 328
 329         _rtl_dump_channel_map(wiphy);
 330
 331         return 0;
 332 }
 333
 334 static const struct ieee80211_regdomain *_rtl_regdomain_select(
 335                                                 struct rtl_regulatory *reg)
 336 {
 337         switch (reg->country_code) {
 338         case COUNTRY_CODE_FCC:
 339                 return &rtl_regdom_no_midband;
 340         case COUNTRY_CODE_IC:
 341                 return &rtl_regdom_11;
 342         case COUNTRY_CODE_ETSI:
 343         case COUNTRY_CODE_TELEC_NETGEAR:
 344                 return &rtl_regdom_60_64;
 345         case COUNTRY_CODE_SPAIN:
 346         case COUNTRY_CODE_FRANCE:
 347         case COUNTRY_CODE_ISRAEL:
 348         case COUNTRY_CODE_WORLD_WIDE_13:
 349                 return &rtl_regdom_12_13;
 350         case COUNTRY_CODE_MKK:
 351         case COUNTRY_CODE_MKK1:
 352         case COUNTRY_CODE_TELEC:
 353         case COUNTRY_CODE_MIC:
 354                 return &rtl_regdom_14_60_64;
 355         case COUNTRY_CODE_GLOBAL_DOMAIN:
 356                 return &rtl_regdom_14;
 357         default:
 358                 return &rtl_regdom_no_midband;
 359         }
 360 }
 361
 362 static int
 363 _rtl92e_regd_init_wiphy(struct rtl_regulatory *reg,
 364                         struct wiphy *wiphy,
 365                         void (*reg_notifier)(struct wiphy *wiphy,
 366                                              struct regulatory_request *req))
 367 {
 368         const struct ieee80211_regdomain *regd;
 369
 370         wiphy->reg_notifier = reg_notifier;
 371
 372         wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
 373         wiphy->regulatory_flags &= ~REGULATORY_STRICT_REG;
 374         wiphy->regulatory_flags &= ~REGULATORY_DISABLE_BEACON_HINTS;
 375
 376         regd = _rtl_regdomain_select(reg);
 377         wiphy_apply_custom_regulatory(wiphy, regd);
 378         _rtl_reg_apply_radar_flags(wiphy);
 379         _rtl_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 380         return 0;
 381 }
 382
 383 static struct country_code_to_enum_rd *_rtl_regd_find_country(u16 countrycode)
 384 {
 385         int i;
 386
 387         for (i = 0; i < ARRAY_SIZE(allcountries); i++) {
 388                 if (allcountries[i].countrycode == countrycode)
 389                         return &allcountries[i];
 390         }
 391         return NULL;
 392 }
 393
 394 int rtl92e_regd_init(struct ieee80211_hw *hw,
 395                      void (*reg_notifier)(struct wiphy *wiphy,
 396                                           struct regulatory_request *request))
 397 {
 398         struct rtl_priv *rtlpriv = rtl_priv(hw);
 399         struct wiphy *wiphy = hw->wiphy;
 400         struct country_code_to_enum_rd *country = NULL;
 401
 402         if (wiphy == NULL || &rtlpriv->regd == NULL)
 403                 return -EINVAL;
 404
 405         /* init country_code from efuse channel plan */
 406         rtlpriv->regd.country_code = rtlpriv->efuse.channel_plan;
 407
 408         RT_TRACE(COMP_REGD, DBG_TRACE,
 409                  KERN_DEBUG "rtl: EEPROM regdomain: 0x%0x\n",
 410                   rtlpriv->regd.country_code);
 411
 412         if (rtlpriv->regd.country_code >= COUNTRY_CODE_MAX) {
 413                 RT_TRACE(COMP_REGD, DBG_DMESG,
 414                          "rtl: EEPROM indicates invalid contry code world wide 13 should be used\n");
 415
 416                 rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
 417         }
 418
 419         country = _rtl_regd_find_country(rtlpriv->regd.country_code);
 420
 421         if (country) {
 422                 rtlpriv->regd.alpha2[0] = country->iso_name[0];
 423                 rtlpriv->regd.alpha2[1] = country->iso_name[1];
 424         } else {
 425                 rtlpriv->regd.alpha2[0] = '0';
 426                 rtlpriv->regd.alpha2[1] = '0';
 427         }
 428
 429         RT_TRACE(COMP_REGD, DBG_TRACE,
 430                  KERN_DEBUG "rtl: Country alpha2 being used: %c%c\n",
 431                   rtlpriv->regd.alpha2[0], rtlpriv->regd.alpha2[1]);
 432
 433         _rtl92e_regd_init_wiphy(&rtlpriv->regd, wiphy, reg_notifier);
 434
 435         return 0;
 436 }
 437
 438 void rtl92e_reg_notifier(struct wiphy *wiphy,
 439                          struct regulatory_request *request)
 440 {
 441         struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 442         struct rtl_priv *rtlpriv = rtl_priv(hw);
 443
 444         RT_TRACE(COMP_REGD, DBG_LOUD, "\n");
 445
 446         _rtl92e_reg_notifier_apply(wiphy, request, &rtlpriv->regd);
 447 }