drivers/staging/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  * 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         {COUNTRY_CODE_WORLD_WIDE_13_5G_ALL, "US"},
  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 /*We enable active scan on these a case
  53  *by case basis by regulatory domain
  54  */
  55 #define RTL819x_2GHZ_CH12_13    \
  56         REG_RULE(2467 - 10, 2472 + 10, 40, 0, 20,\
  57         NL80211_RRF_PASSIVE_SCAN)
  58
  59 #define RTL819x_2GHZ_CH14       \
  60         REG_RULE(2484 - 10, 2484 + 10, 40, 0, 20, \
  61         NL80211_RRF_PASSIVE_SCAN | \
  62         NL80211_RRF_NO_OFDM)
  63
  64 /* 5G chan 36 - chan 64*/
  65 #define RTL819x_5GHZ_5150_5350  \
  66         REG_RULE(5150 - 10, 5350 + 10, 80, 0, 30, 0)
  67 /* 5G chan 100 - chan 165*/
  68 #define RTL819x_5GHZ_5470_5850  \
  69         REG_RULE(5470 - 10, 5850 + 10, 80, 0, 30, 0)
  70 /* 5G chan 149 - chan 165*/
  71 #define RTL819x_5GHZ_5725_5850  \
  72         REG_RULE(5725 - 10, 5850 + 10, 80, 0, 30, 0)
  73
  74 #define RTL819x_5GHZ_ALL        \
  75         (RTL819x_5GHZ_5150_5350, RTL819x_5GHZ_5470_5850)
  76
  77 static const struct ieee80211_regdomain rtl_regdom_11 = {
  78         .n_reg_rules = 1,
  79         .alpha2 = "99",
  80         .reg_rules = {
  81                 RTL819x_2GHZ_CH01_11,
  82         }
  83 };
  84
  85 static const struct ieee80211_regdomain rtl_regdom_12_13 = {
  86         .n_reg_rules = 2,
  87         .alpha2 = "99",
  88         .reg_rules = {
  89                 RTL819x_2GHZ_CH01_11,
  90                 RTL819x_2GHZ_CH12_13,
  91         }
  92 };
  93
  94 static const struct ieee80211_regdomain rtl_regdom_no_midband = {
  95         .n_reg_rules = 3,
  96         .alpha2 = "99",
  97         .reg_rules = {
  98                 RTL819x_2GHZ_CH01_11,
  99                 RTL819x_5GHZ_5150_5350,
 100                 RTL819x_5GHZ_5725_5850,
 101         }
 102 };
 103
 104 static const struct ieee80211_regdomain rtl_regdom_60_64 = {
 105         .n_reg_rules = 3,
 106         .alpha2 = "99",
 107         .reg_rules = {
 108                 RTL819x_2GHZ_CH01_11,
 109                 RTL819x_2GHZ_CH12_13,
 110                 RTL819x_5GHZ_5725_5850,
 111         }
 112 };
 113
 114 static const struct ieee80211_regdomain rtl_regdom_14_60_64 = {
 115         .n_reg_rules = 4,
 116         .alpha2 = "99",
 117         .reg_rules = {
 118                 RTL819x_2GHZ_CH01_11,
 119                 RTL819x_2GHZ_CH12_13,
 120                 RTL819x_2GHZ_CH14,
 121                 RTL819x_5GHZ_5725_5850,
 122         }
 123 };
 124
 125 static const struct ieee80211_regdomain rtl_regdom_12_13_5g_all = {
 126         .n_reg_rules = 4,
 127         .alpha2 = "99",
 128         .reg_rules = {
 129                 RTL819x_2GHZ_CH01_11,
 130                 RTL819x_2GHZ_CH12_13,
 131                 RTL819x_5GHZ_5150_5350,
 132                 RTL819x_5GHZ_5470_5850,
 133         }
 134 };
 135
 136 static const struct ieee80211_regdomain rtl_regdom_14 = {
 137         .n_reg_rules = 3,
 138         .alpha2 = "99",
 139         .reg_rules = {
 140                 RTL819x_2GHZ_CH01_11,
 141                 RTL819x_2GHZ_CH12_13,
 142                 RTL819x_2GHZ_CH14,
 143         }
 144 };
 145
 146 static bool _rtl_is_radar_freq(u16 center_freq)
 147 {
 148         return center_freq >= 5260 && center_freq <= 5700;
 149 }
 150
 151 static void _rtl_reg_apply_beaconing_flags(struct wiphy *wiphy,
 152                                            enum nl80211_reg_initiator initiator)
 153 {
 154         enum nl80211_band band;
 155         struct ieee80211_supported_band *sband;
 156         const struct ieee80211_reg_rule *reg_rule;
 157         struct ieee80211_channel *ch;
 158         unsigned int i;
 159
 160         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 161                 if (!wiphy->bands[band])
 162                         continue;
 163
 164                 sband = wiphy->bands[band];
 165
 166                 for (i = 0; i < sband->n_channels; i++) {
 167                         ch = &sband->channels[i];
 168                         if (_rtl_is_radar_freq(ch->center_freq) ||
 169                             (ch->flags & IEEE80211_CHAN_RADAR))
 170                                 continue;
 171                         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 172                                 reg_rule = freq_reg_info(wiphy,
 173                                                          ch->center_freq);
 174                                 if (IS_ERR(reg_rule))
 175                                         continue;
 176                                 /*
 177                                  *If 11d had a rule for this channel ensure
 178                                  *we enable adhoc/beaconing if it allows us to
 179                                  *use it. Note that we would have disabled it
 180                                  *by applying our static world regdomain by
 181                                  *default during init, prior to calling our
 182                                  *regulatory_hint().
 183                                  */
 184
 185                                 if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
 186                                         ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
 187                                 if (!(reg_rule->flags &
 188                                       NL80211_RRF_PASSIVE_SCAN))
 189                                         ch->flags &=
 190                                             ~IEEE80211_CHAN_PASSIVE_SCAN;
 191                         } else {
 192                                 if (ch->beacon_found)
 193                                         ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 194                                                    IEEE80211_CHAN_PASSIVE_SCAN);
 195                         }
 196                 }
 197         }
 198 }
 199
 200 /* Allows active scan scan on Ch 12 and 13 */
 201 static void _rtl_reg_apply_active_scan_flags(struct wiphy *wiphy,
 202                                              enum nl80211_reg_initiator
 203                                              initiator)
 204 {
 205         struct ieee80211_supported_band *sband;
 206         struct ieee80211_channel *ch;
 207         const struct ieee80211_reg_rule *reg_rule;
 208
 209         if (!wiphy->bands[NL80211_BAND_2GHZ])
 210                 return;
 211         sband = wiphy->bands[NL80211_BAND_2GHZ];
 212
 213         /*
 214          *If no country IE has been received always enable active scan
 215          *on these channels. This is only done for specific regulatory SKUs
 216          */
 217         if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 218                 ch = &sband->channels[11];      /* CH 12 */
 219                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 220                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 221                 ch = &sband->channels[12];      /* CH 13 */
 222                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 223                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 224                 return;
 225         }
 226
 227         /*If a country IE has been received 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[NL80211_BAND_5GHZ])
 261                 return;
 262
 263         sband = wiphy->bands[NL80211_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 nl80211_band band;
 299         struct ieee80211_supported_band *sband;
 300         struct ieee80211_channel *ch;
 301         unsigned int i;
 302
 303         for (band = 0; band < NUM_NL80211_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 _rtl_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_TELEC_NETGEAR:
 343                 return &rtl_regdom_60_64;
 344         case COUNTRY_CODE_ETSI:
 345         case COUNTRY_CODE_SPAIN:
 346         case COUNTRY_CODE_FRANCE:
 347         case COUNTRY_CODE_ISRAEL:
 348                 return &rtl_regdom_12_13;
 349         case COUNTRY_CODE_MKK:
 350         case COUNTRY_CODE_MKK1:
 351         case COUNTRY_CODE_TELEC:
 352         case COUNTRY_CODE_MIC:
 353                 return &rtl_regdom_14_60_64;
 354         case COUNTRY_CODE_GLOBAL_DOMAIN:
 355                 return &rtl_regdom_14;
 356         case COUNTRY_CODE_WORLD_WIDE_13:
 357         case COUNTRY_CODE_WORLD_WIDE_13_5G_ALL:
 358                 return &rtl_regdom_12_13_5g_all;
 359         default:
 360                 return &rtl_regdom_no_midband;
 361         }
 362 }
 363
 364 static int _rtl_regd_init_wiphy(struct rtl_regulatory *reg,
 365                                 struct wiphy *wiphy,
 366                                 void (*reg_notifier)(struct wiphy *wiphy,
 367                                                      struct regulatory_request *
 368                                                      request))
 369 {
 370         const struct ieee80211_regdomain *regd;
 371
 372         wiphy->reg_notifier = reg_notifier;
 373
 374         wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
 375         wiphy->regulatory_flags &= ~REGULATORY_STRICT_REG;
 376         wiphy->regulatory_flags &= ~REGULATORY_DISABLE_BEACON_HINTS;
 377         regd = _rtl_regdomain_select(reg);
 378         wiphy_apply_custom_regulatory(wiphy, regd);
 379         _rtl_reg_apply_radar_flags(wiphy);
 380         _rtl_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 381         return 0;
 382 }
 383
 384 static struct country_code_to_enum_rd *_rtl_regd_find_country(u16 countrycode)
 385 {
 386         int i;
 387
 388         for (i = 0; i < ARRAY_SIZE(allcountries); i++) {
 389                 if (allcountries[i].countrycode == countrycode)
 390                         return &allcountries[i];
 391         }
 392         return NULL;
 393 }
 394
 395 static u8 channel_plan_to_country_code(u8 channelplan)
 396 {
 397         switch (channelplan) {
 398         case 0x20:
 399         case 0x21:
 400                 return COUNTRY_CODE_WORLD_WIDE_13;
 401         case 0x22:
 402                 return COUNTRY_CODE_IC;
 403         case 0x25:
 404                 return COUNTRY_CODE_ETSI;
 405         case 0x32:
 406                 return COUNTRY_CODE_TELEC_NETGEAR;
 407         case 0x41:
 408                 return COUNTRY_CODE_GLOBAL_DOMAIN;
 409         case 0x7f:
 410                 return COUNTRY_CODE_WORLD_WIDE_13_5G_ALL;
 411         default:
 412                 return COUNTRY_CODE_MAX; /*Error*/
 413         }
 414 }
 415
 416 int rtl_regd_init(struct ieee80211_hw *hw,
 417                   void (*reg_notifier)(struct wiphy *wiphy,
 418                                        struct regulatory_request *request))
 419 {
 420         struct rtl_priv *rtlpriv = rtl_priv(hw);
 421         struct wiphy *wiphy = hw->wiphy;
 422         struct country_code_to_enum_rd *country = NULL;
 423
 424         if (!wiphy || !&rtlpriv->regd)
 425                 return -EINVAL;
 426
 427         /* init country_code from efuse channel plan */
 428         rtlpriv->regd.country_code =
 429                 channel_plan_to_country_code(rtlpriv->efuse.channel_plan);
 430
 431         RT_TRACE(rtlpriv, COMP_REGD, DBG_DMESG,
 432                  "rtl: EEPROM regdomain: 0x%0x country code: %d\n",
 433                  rtlpriv->efuse.channel_plan, rtlpriv->regd.country_code);
 434
 435         if (rtlpriv->regd.country_code >= COUNTRY_CODE_MAX) {
 436                 RT_TRACE(rtlpriv, COMP_REGD, DBG_DMESG,
 437                          "rtl: EEPROM indicates invalid country code, world wide 13 should be used\n");
 438
 439                 rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
 440         }
 441
 442         country = _rtl_regd_find_country(rtlpriv->regd.country_code);
 443
 444         if (country) {
 445                 rtlpriv->regd.alpha2[0] = country->iso_name[0];
 446                 rtlpriv->regd.alpha2[1] = country->iso_name[1];
 447         } else {
 448                 rtlpriv->regd.alpha2[0] = '0';
 449                 rtlpriv->regd.alpha2[1] = '0';
 450         }
 451
 452         RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
 453                  "rtl: Country alpha2 being used: %c%c\n",
 454                   rtlpriv->regd.alpha2[0], rtlpriv->regd.alpha2[1]);
 455
 456         _rtl_regd_init_wiphy(&rtlpriv->regd, wiphy, reg_notifier);
 457
 458         return 0;
 459 }
 460
 461 void rtl_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 462 {
 463         struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 464         struct rtl_priv *rtlpriv = rtl_priv(hw);
 465
 466         RT_TRACE(rtlpriv, COMP_REGD, DBG_LOUD, "\n");
 467
 468         _rtl_reg_notifier_apply(wiphy, request, &rtlpriv->regd);
 469 }