drivers/net/wireless/rtlwifi/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 static const struct ieee80211_regdomain rtl_regdom_11 = {
  70         .n_reg_rules = 1,
  71         .alpha2 = "99",
  72         .reg_rules = {
  73                       RTL819x_2GHZ_CH01_11,
  74         }
  75 };
  76
  77 static const struct ieee80211_regdomain rtl_regdom_global = {
  78         .n_reg_rules = 3,
  79         .alpha2 = "99",
  80         .reg_rules = {
  81                       RTL819x_2GHZ_CH01_11,
  82                       RTL819x_2GHZ_CH12_13,
  83                       RTL819x_2GHZ_CH14,
  84         }
  85 };
  86
  87 static const struct ieee80211_regdomain rtl_regdom_world = {
  88         .n_reg_rules = 2,
  89         .alpha2 = "99",
  90         .reg_rules = {
  91                       RTL819x_2GHZ_CH01_11,
  92                       RTL819x_2GHZ_CH12_13,
  93         }
  94 };
  95
  96 static bool _rtl_is_radar_freq(u16 center_freq)
  97 {
  98         return (center_freq >= 5260 && center_freq <= 5700);
  99 }
 100
 101 static void _rtl_reg_apply_beaconing_flags(struct wiphy *wiphy,
 102                                            enum nl80211_reg_initiator initiator)
 103 {
 104         enum ieee80211_band band;
 105         struct ieee80211_supported_band *sband;
 106         const struct ieee80211_reg_rule *reg_rule;
 107         struct ieee80211_channel *ch;
 108         unsigned int i;
 109         u32 bandwidth = 0;
 110         int r;
 111
 112         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 113
 114                 if (!wiphy->bands[band])
 115                         continue;
 116
 117                 sband = wiphy->bands[band];
 118
 119                 for (i = 0; i < sband->n_channels; i++) {
 120                         ch = &sband->channels[i];
 121                         if (_rtl_is_radar_freq(ch->center_freq) ||
 122                             (ch->flags & IEEE80211_CHAN_RADAR))
 123                                 continue;
 124                         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 125                                 r = freq_reg_info(wiphy, ch->center_freq,
 126                                                   bandwidth, &reg_rule);
 127                                 if (r)
 128                                         continue;
 129
 130                                 /*
 131                                  *If 11d had a rule for this channel ensure
 132                                  *we enable adhoc/beaconing if it allows us to
 133                                  *use it. Note that we would have disabled it
 134                                  *by applying our static world regdomain by
 135                                  *default during init, prior to calling our
 136                                  *regulatory_hint().
 137                                  */
 138
 139                                 if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
 140                                         ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
 141                                 if (!(reg_rule->
 142                                      flags & NL80211_RRF_PASSIVE_SCAN))
 143                                         ch->flags &=
 144                                             ~IEEE80211_CHAN_PASSIVE_SCAN;
 145                         } else {
 146                                 if (ch->beacon_found)
 147                                         ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 148                                                   IEEE80211_CHAN_PASSIVE_SCAN);
 149                         }
 150                 }
 151         }
 152 }
 153
 154 /* Allows active scan scan on Ch 12 and 13 */
 155 static void _rtl_reg_apply_active_scan_flags(struct wiphy *wiphy,
 156                                              enum nl80211_reg_initiator
 157                                              initiator)
 158 {
 159         struct ieee80211_supported_band *sband;
 160         struct ieee80211_channel *ch;
 161         const struct ieee80211_reg_rule *reg_rule;
 162         u32 bandwidth = 0;
 163         int r;
 164
 165         sband = wiphy->bands[IEEE80211_BAND_2GHZ];
 166
 167         /*
 168          *If no country IE has been received always enable active scan
 169          *on these channels. This is only done for specific regulatory SKUs
 170          */
 171         if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 172                 ch = &sband->channels[11];      /* CH 12 */
 173                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 174                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 175                 ch = &sband->channels[12];      /* CH 13 */
 176                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 177                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 178                 return;
 179         }
 180
 181         /*
 182          *If a country IE has been recieved check its rule for this
 183          *channel first before enabling active scan. The passive scan
 184          *would have been enforced by the initial processing of our
 185          *custom regulatory domain.
 186          */
 187
 188         ch = &sband->channels[11];      /* CH 12 */
 189         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 190         if (!r) {
 191                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 192                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 193                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 194         }
 195
 196         ch = &sband->channels[12];      /* CH 13 */
 197         r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 198         if (!r) {
 199                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 200                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 201                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 202         }
 203 }
 204
 205 /*
 206  *Always apply Radar/DFS rules on
 207  *freq range 5260 MHz - 5700 MHz
 208  */
 209 static void _rtl_reg_apply_radar_flags(struct wiphy *wiphy)
 210 {
 211         struct ieee80211_supported_band *sband;
 212         struct ieee80211_channel *ch;
 213         unsigned int i;
 214
 215         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 216                 return;
 217
 218         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 219
 220         for (i = 0; i < sband->n_channels; i++) {
 221                 ch = &sband->channels[i];
 222                 if (!_rtl_is_radar_freq(ch->center_freq))
 223                         continue;
 224
 225                 /*
 226                  *We always enable radar detection/DFS on this
 227                  *frequency range. Additionally we also apply on
 228                  *this frequency range:
 229                  *- If STA mode does not yet have DFS supports disable
 230                  * active scanning
 231                  *- If adhoc mode does not support DFS yet then disable
 232                  * adhoc in the frequency.
 233                  *- If AP mode does not yet support radar detection/DFS
 234                  *do not allow AP mode
 235                  */
 236                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 237                         ch->flags |= IEEE80211_CHAN_RADAR |
 238                             IEEE80211_CHAN_NO_IBSS |
 239                             IEEE80211_CHAN_PASSIVE_SCAN;
 240         }
 241 }
 242
 243 static void _rtl_reg_apply_world_flags(struct wiphy *wiphy,
 244                                        enum nl80211_reg_initiator initiator,
 245                                        struct rtl_regulatory *reg)
 246 {
 247         _rtl_reg_apply_beaconing_flags(wiphy, initiator);
 248         _rtl_reg_apply_active_scan_flags(wiphy, initiator);
 249         return;
 250 }
 251
 252 static void _rtl_dump_channel_map(struct wiphy *wiphy)
 253 {
 254         enum ieee80211_band band;
 255         struct ieee80211_supported_band *sband;
 256         struct ieee80211_channel *ch;
 257         unsigned int i;
 258
 259         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 260                 if (!wiphy->bands[band])
 261                         continue;
 262                 sband = wiphy->bands[band];
 263                 for (i = 0; i < sband->n_channels; i++)
 264                         ch = &sband->channels[i];
 265         }
 266 }
 267
 268 static int _rtl_reg_notifier_apply(struct wiphy *wiphy,
 269                                    struct regulatory_request *request,
 270                                    struct rtl_regulatory *reg)
 271 {
 272         /* We always apply this */
 273         _rtl_reg_apply_radar_flags(wiphy);
 274
 275         switch (request->initiator) {
 276         case NL80211_REGDOM_SET_BY_DRIVER:
 277         case NL80211_REGDOM_SET_BY_CORE:
 278         case NL80211_REGDOM_SET_BY_USER:
 279                 break;
 280         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 281                 _rtl_reg_apply_world_flags(wiphy, request->initiator, reg);
 282                 break;
 283         }
 284
 285         _rtl_dump_channel_map(wiphy);
 286
 287         return 0;
 288 }
 289
 290 static const struct ieee80211_regdomain *_rtl_regdomain_select(
 291                                                struct rtl_regulatory *reg)
 292 {
 293         switch (reg->country_code) {
 294         case COUNTRY_CODE_FCC:
 295         case COUNTRY_CODE_IC:
 296                 return &rtl_regdom_11;
 297         case COUNTRY_CODE_ETSI:
 298         case COUNTRY_CODE_SPAIN:
 299         case COUNTRY_CODE_FRANCE:
 300         case COUNTRY_CODE_ISRAEL:
 301         case COUNTRY_CODE_TELEC_NETGEAR:
 302                 return &rtl_regdom_world;
 303         case COUNTRY_CODE_MKK:
 304         case COUNTRY_CODE_MKK1:
 305         case COUNTRY_CODE_TELEC:
 306         case COUNTRY_CODE_MIC:
 307                 return &rtl_regdom_global;
 308         case COUNTRY_CODE_GLOBAL_DOMAIN:
 309                 return &rtl_regdom_global;
 310         case COUNTRY_CODE_WORLD_WIDE_13:
 311                 return &rtl_regdom_world;
 312         default:
 313                 return &rtl_regdom_world;
 314         }
 315 }
 316
 317 static int _rtl_regd_init_wiphy(struct rtl_regulatory *reg,
 318                                 struct wiphy *wiphy,
 319                                 int (*reg_notifier) (struct wiphy *wiphy,
 320                                                      struct regulatory_request *
 321                                                      request))
 322 {
 323         const struct ieee80211_regdomain *regd;
 324
 325         wiphy->reg_notifier = reg_notifier;
 326         wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
 327         wiphy->flags &= ~WIPHY_FLAG_STRICT_REGULATORY;
 328         wiphy->flags &= ~WIPHY_FLAG_DISABLE_BEACON_HINTS;
 329         regd = _rtl_regdomain_select(reg);
 330         wiphy_apply_custom_regulatory(wiphy, regd);
 331         _rtl_reg_apply_radar_flags(wiphy);
 332         _rtl_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 333         return 0;
 334 }
 335
 336 static struct country_code_to_enum_rd *_rtl_regd_find_country(u16 countrycode)
 337 {
 338         int i;
 339
 340         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 341                 if (allCountries[i].countrycode == countrycode)
 342                         return &allCountries[i];
 343         }
 344         return NULL;
 345 }
 346
 347 int rtl_regd_init(struct ieee80211_hw *hw,
 348                   int (*reg_notifier) (struct wiphy *wiphy,
 349                                        struct regulatory_request *request))
 350 {
 351         struct rtl_priv *rtlpriv = rtl_priv(hw);
 352         struct wiphy *wiphy = hw->wiphy;
 353         struct country_code_to_enum_rd *country = NULL;
 354
 355         if (wiphy == NULL || &rtlpriv->regd == NULL)
 356                 return -EINVAL;
 357
 358         /* force the channel plan to world wide 13 */
 359         rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
 360
 361         RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
 362                  (KERN_DEBUG "rtl: EEPROM regdomain: 0x%0x\n",
 363                   rtlpriv->regd.country_code));
 364
 365         if (rtlpriv->regd.country_code >= COUNTRY_CODE_MAX) {
 366                 RT_TRACE(rtlpriv, COMP_REGD, DBG_DMESG,
 367                          (KERN_DEBUG "rtl: EEPROM indicates invalid contry code"
 368                           "world wide 13 should be used\n"));
 369
 370                 rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
 371         }
 372
 373         country = _rtl_regd_find_country(rtlpriv->regd.country_code);
 374
 375         if (country) {
 376                 rtlpriv->regd.alpha2[0] = country->isoName[0];
 377                 rtlpriv->regd.alpha2[1] = country->isoName[1];
 378         } else {
 379                 rtlpriv->regd.alpha2[0] = '0';
 380                 rtlpriv->regd.alpha2[1] = '0';
 381         }
 382
 383         RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
 384                  (KERN_DEBUG "rtl: Country alpha2 being used: %c%c\n",
 385                   rtlpriv->regd.alpha2[0], rtlpriv->regd.alpha2[1]));
 386
 387         _rtl_regd_init_wiphy(&rtlpriv->regd, wiphy, reg_notifier);
 388
 389         return 0;
 390 }
 391
 392 int rtl_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 393 {
 394         struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 395         struct rtl_priv *rtlpriv = rtl_priv(hw);
 396
 397         RT_TRACE(rtlpriv, COMP_REGD, DBG_LOUD, ("\n"));
 398
 399         return _rtl_reg_notifier_apply(wiphy, request, &rtlpriv->regd);
 400 }