drivers/staging/rtlwifi/regd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Copyright(c) 2009-2012  Realtek Corporation.
   5  *
   6  * Contact Information:
   7  * wlanfae <wlanfae@realtek.com>
   8  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
   9  * Hsinchu 300, Taiwan.
  10  *
  11  * Larry Finger <Larry.Finger@lwfinger.net>
  12  *
  13  *****************************************************************************/
  14
  15 #include "wifi.h"
  16 #include "regd.h"
  17
  18 static struct country_code_to_enum_rd allcountries[] = {
  19         {COUNTRY_CODE_FCC, "US"},
  20         {COUNTRY_CODE_IC, "US"},
  21         {COUNTRY_CODE_ETSI, "EC"},
  22         {COUNTRY_CODE_SPAIN, "EC"},
  23         {COUNTRY_CODE_FRANCE, "EC"},
  24         {COUNTRY_CODE_MKK, "JP"},
  25         {COUNTRY_CODE_MKK1, "JP"},
  26         {COUNTRY_CODE_ISRAEL, "EC"},
  27         {COUNTRY_CODE_TELEC, "JP"},
  28         {COUNTRY_CODE_MIC, "JP"},
  29         {COUNTRY_CODE_GLOBAL_DOMAIN, "JP"},
  30         {COUNTRY_CODE_WORLD_WIDE_13, "EC"},
  31         {COUNTRY_CODE_TELEC_NETGEAR, "EC"},
  32         {COUNTRY_CODE_WORLD_WIDE_13_5G_ALL, "US"},
  33 };
  34
  35 /*Only these channels all allow active
  36  *scan on all world regulatory domains
  37  */
  38 #define RTL819x_2GHZ_CH01_11    \
  39         REG_RULE(2412 - 10, 2462 + 10, 40, 0, 20, 0)
  40
  41 /*We enable active scan on these a case
  42  *by case basis by regulatory domain
  43  */
  44 #define RTL819x_2GHZ_CH12_13    \
  45         REG_RULE(2467 - 10, 2472 + 10, 40, 0, 20,\
  46         NL80211_RRF_PASSIVE_SCAN)
  47
  48 #define RTL819x_2GHZ_CH14       \
  49         REG_RULE(2484 - 10, 2484 + 10, 40, 0, 20, \
  50         NL80211_RRF_PASSIVE_SCAN | \
  51         NL80211_RRF_NO_OFDM)
  52
  53 /* 5G chan 36 - chan 64*/
  54 #define RTL819x_5GHZ_5150_5350  \
  55         REG_RULE(5150 - 10, 5350 + 10, 80, 0, 30, 0)
  56 /* 5G chan 100 - chan 165*/
  57 #define RTL819x_5GHZ_5470_5850  \
  58         REG_RULE(5470 - 10, 5850 + 10, 80, 0, 30, 0)
  59 /* 5G chan 149 - chan 165*/
  60 #define RTL819x_5GHZ_5725_5850  \
  61         REG_RULE(5725 - 10, 5850 + 10, 80, 0, 30, 0)
  62
  63 #define RTL819x_5GHZ_ALL        \
  64         (RTL819x_5GHZ_5150_5350, RTL819x_5GHZ_5470_5850)
  65
  66 static const struct ieee80211_regdomain rtl_regdom_11 = {
  67         .n_reg_rules = 1,
  68         .alpha2 = "99",
  69         .reg_rules = {
  70                 RTL819x_2GHZ_CH01_11,
  71         }
  72 };
  73
  74 static const struct ieee80211_regdomain rtl_regdom_12_13 = {
  75         .n_reg_rules = 2,
  76         .alpha2 = "99",
  77         .reg_rules = {
  78                 RTL819x_2GHZ_CH01_11,
  79                 RTL819x_2GHZ_CH12_13,
  80         }
  81 };
  82
  83 static const struct ieee80211_regdomain rtl_regdom_no_midband = {
  84         .n_reg_rules = 3,
  85         .alpha2 = "99",
  86         .reg_rules = {
  87                 RTL819x_2GHZ_CH01_11,
  88                 RTL819x_5GHZ_5150_5350,
  89                 RTL819x_5GHZ_5725_5850,
  90         }
  91 };
  92
  93 static const struct ieee80211_regdomain rtl_regdom_60_64 = {
  94         .n_reg_rules = 3,
  95         .alpha2 = "99",
  96         .reg_rules = {
  97                 RTL819x_2GHZ_CH01_11,
  98                 RTL819x_2GHZ_CH12_13,
  99                 RTL819x_5GHZ_5725_5850,
 100         }
 101 };
 102
 103 static const struct ieee80211_regdomain rtl_regdom_14_60_64 = {
 104         .n_reg_rules = 4,
 105         .alpha2 = "99",
 106         .reg_rules = {
 107                 RTL819x_2GHZ_CH01_11,
 108                 RTL819x_2GHZ_CH12_13,
 109                 RTL819x_2GHZ_CH14,
 110                 RTL819x_5GHZ_5725_5850,
 111         }
 112 };
 113
 114 static const struct ieee80211_regdomain rtl_regdom_12_13_5g_all = {
 115         .n_reg_rules = 4,
 116         .alpha2 = "99",
 117         .reg_rules = {
 118                 RTL819x_2GHZ_CH01_11,
 119                 RTL819x_2GHZ_CH12_13,
 120                 RTL819x_5GHZ_5150_5350,
 121                 RTL819x_5GHZ_5470_5850,
 122         }
 123 };
 124
 125 static const struct ieee80211_regdomain rtl_regdom_14 = {
 126         .n_reg_rules = 3,
 127         .alpha2 = "99",
 128         .reg_rules = {
 129                 RTL819x_2GHZ_CH01_11,
 130                 RTL819x_2GHZ_CH12_13,
 131                 RTL819x_2GHZ_CH14,
 132         }
 133 };
 134
 135 static bool _rtl_is_radar_freq(u16 center_freq)
 136 {
 137         return center_freq >= 5260 && center_freq <= 5700;
 138 }
 139
 140 static void _rtl_reg_apply_beaconing_flags(struct wiphy *wiphy,
 141                                            enum nl80211_reg_initiator initiator)
 142 {
 143         enum nl80211_band band;
 144         struct ieee80211_supported_band *sband;
 145         const struct ieee80211_reg_rule *reg_rule;
 146         struct ieee80211_channel *ch;
 147         unsigned int i;
 148
 149         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 150                 if (!wiphy->bands[band])
 151                         continue;
 152
 153                 sband = wiphy->bands[band];
 154
 155                 for (i = 0; i < sband->n_channels; i++) {
 156                         ch = &sband->channels[i];
 157                         if (_rtl_is_radar_freq(ch->center_freq) ||
 158                             (ch->flags & IEEE80211_CHAN_RADAR))
 159                                 continue;
 160                         if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 161                                 reg_rule = freq_reg_info(wiphy,
 162                                                          ch->center_freq);
 163                                 if (IS_ERR(reg_rule))
 164                                         continue;
 165                                 /*
 166                                  *If 11d had a rule for this channel ensure
 167                                  *we enable adhoc/beaconing if it allows us to
 168                                  *use it. Note that we would have disabled it
 169                                  *by applying our static world regdomain by
 170                                  *default during init, prior to calling our
 171                                  *regulatory_hint().
 172                                  */
 173
 174                                 if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
 175                                         ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
 176                                 if (!(reg_rule->flags &
 177                                       NL80211_RRF_PASSIVE_SCAN))
 178                                         ch->flags &=
 179                                             ~IEEE80211_CHAN_PASSIVE_SCAN;
 180                         } else {
 181                                 if (ch->beacon_found)
 182                                         ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 183                                                    IEEE80211_CHAN_PASSIVE_SCAN);
 184                         }
 185                 }
 186         }
 187 }
 188
 189 /* Allows active scan scan on Ch 12 and 13 */
 190 static void _rtl_reg_apply_active_scan_flags(struct wiphy *wiphy,
 191                                              enum nl80211_reg_initiator
 192                                              initiator)
 193 {
 194         struct ieee80211_supported_band *sband;
 195         struct ieee80211_channel *ch;
 196         const struct ieee80211_reg_rule *reg_rule;
 197
 198         if (!wiphy->bands[NL80211_BAND_2GHZ])
 199                 return;
 200         sband = wiphy->bands[NL80211_BAND_2GHZ];
 201
 202         /*
 203          *If no country IE has been received always enable active scan
 204          *on these channels. This is only done for specific regulatory SKUs
 205          */
 206         if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 207                 ch = &sband->channels[11];      /* CH 12 */
 208                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 209                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 210                 ch = &sband->channels[12];      /* CH 13 */
 211                 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 212                         ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 213                 return;
 214         }
 215
 216         /*If a country IE has been received check its rule for this
 217          *channel first before enabling active scan. The passive scan
 218          *would have been enforced by the initial processing of our
 219          *custom regulatory domain.
 220          */
 221
 222         ch = &sband->channels[11];      /* CH 12 */
 223         reg_rule = freq_reg_info(wiphy, ch->center_freq);
 224         if (!IS_ERR(reg_rule)) {
 225                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 226                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 227                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 228         }
 229
 230         ch = &sband->channels[12];      /* CH 13 */
 231         reg_rule = freq_reg_info(wiphy, ch->center_freq);
 232         if (!IS_ERR(reg_rule)) {
 233                 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 234                         if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 235                                 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 236         }
 237 }
 238
 239 /*
 240  *Always apply Radar/DFS rules on
 241  *freq range 5260 MHz - 5700 MHz
 242  */
 243 static void _rtl_reg_apply_radar_flags(struct wiphy *wiphy)
 244 {
 245         struct ieee80211_supported_band *sband;
 246         struct ieee80211_channel *ch;
 247         unsigned int i;
 248
 249         if (!wiphy->bands[NL80211_BAND_5GHZ])
 250                 return;
 251
 252         sband = wiphy->bands[NL80211_BAND_5GHZ];
 253
 254         for (i = 0; i < sband->n_channels; i++) {
 255                 ch = &sband->channels[i];
 256                 if (!_rtl_is_radar_freq(ch->center_freq))
 257                         continue;
 258
 259                 /*
 260                  *We always enable radar detection/DFS on this
 261                  *frequency range. Additionally we also apply on
 262                  *this frequency range:
 263                  *- If STA mode does not yet have DFS supports disable
 264                  * active scanning
 265                  *- If adhoc mode does not support DFS yet then disable
 266                  * adhoc in the frequency.
 267                  *- If AP mode does not yet support radar detection/DFS
 268                  *do not allow AP mode
 269                  */
 270                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 271                         ch->flags |= IEEE80211_CHAN_RADAR |
 272                             IEEE80211_CHAN_NO_IBSS |
 273                             IEEE80211_CHAN_PASSIVE_SCAN;
 274         }
 275 }
 276
 277 static void _rtl_reg_apply_world_flags(struct wiphy *wiphy,
 278                                        enum nl80211_reg_initiator initiator,
 279                                        struct rtl_regulatory *reg)
 280 {
 281         _rtl_reg_apply_beaconing_flags(wiphy, initiator);
 282         _rtl_reg_apply_active_scan_flags(wiphy, initiator);
 283 }
 284
 285 static void _rtl_dump_channel_map(struct wiphy *wiphy)
 286 {
 287         enum nl80211_band band;
 288         struct ieee80211_supported_band *sband;
 289         struct ieee80211_channel *ch;
 290         unsigned int i;
 291
 292         for (band = 0; band < NUM_NL80211_BANDS; band++) {
 293                 if (!wiphy->bands[band])
 294                         continue;
 295                 sband = wiphy->bands[band];
 296                 for (i = 0; i < sband->n_channels; i++)
 297                         ch = &sband->channels[i];
 298         }
 299 }
 300
 301 static int _rtl_reg_notifier_apply(struct wiphy *wiphy,
 302                                    struct regulatory_request *request,
 303                                    struct rtl_regulatory *reg)
 304 {
 305         /* We always apply this */
 306         _rtl_reg_apply_radar_flags(wiphy);
 307
 308         switch (request->initiator) {
 309         case NL80211_REGDOM_SET_BY_DRIVER:
 310         case NL80211_REGDOM_SET_BY_CORE:
 311         case NL80211_REGDOM_SET_BY_USER:
 312                 break;
 313         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 314                 _rtl_reg_apply_world_flags(wiphy, request->initiator, reg);
 315                 break;
 316         }
 317
 318         _rtl_dump_channel_map(wiphy);
 319
 320         return 0;
 321 }
 322
 323 static const struct ieee80211_regdomain *_rtl_regdomain_select(
 324                                                 struct rtl_regulatory *reg)
 325 {
 326         switch (reg->country_code) {
 327         case COUNTRY_CODE_FCC:
 328                 return &rtl_regdom_no_midband;
 329         case COUNTRY_CODE_IC:
 330                 return &rtl_regdom_11;
 331         case COUNTRY_CODE_TELEC_NETGEAR:
 332                 return &rtl_regdom_60_64;
 333         case COUNTRY_CODE_ETSI:
 334         case COUNTRY_CODE_SPAIN:
 335         case COUNTRY_CODE_FRANCE:
 336         case COUNTRY_CODE_ISRAEL:
 337                 return &rtl_regdom_12_13;
 338         case COUNTRY_CODE_MKK:
 339         case COUNTRY_CODE_MKK1:
 340         case COUNTRY_CODE_TELEC:
 341         case COUNTRY_CODE_MIC:
 342                 return &rtl_regdom_14_60_64;
 343         case COUNTRY_CODE_GLOBAL_DOMAIN:
 344                 return &rtl_regdom_14;
 345         case COUNTRY_CODE_WORLD_WIDE_13:
 346         case COUNTRY_CODE_WORLD_WIDE_13_5G_ALL:
 347                 return &rtl_regdom_12_13_5g_all;
 348         default:
 349                 return &rtl_regdom_no_midband;
 350         }
 351 }
 352
 353 static int _rtl_regd_init_wiphy(struct rtl_regulatory *reg,
 354                                 struct wiphy *wiphy,
 355                                 void (*reg_notifier)(struct wiphy *wiphy,
 356                                                      struct regulatory_request *
 357                                                      request))
 358 {
 359         const struct ieee80211_regdomain *regd;
 360
 361         wiphy->reg_notifier = reg_notifier;
 362
 363         wiphy->regulatory_flags |= REGULATORY_CUSTOM_REG;
 364         wiphy->regulatory_flags &= ~REGULATORY_STRICT_REG;
 365         wiphy->regulatory_flags &= ~REGULATORY_DISABLE_BEACON_HINTS;
 366         regd = _rtl_regdomain_select(reg);
 367         wiphy_apply_custom_regulatory(wiphy, regd);
 368         _rtl_reg_apply_radar_flags(wiphy);
 369         _rtl_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 370         return 0;
 371 }
 372
 373 static struct country_code_to_enum_rd *_rtl_regd_find_country(u16 countrycode)
 374 {
 375         int i;
 376
 377         for (i = 0; i < ARRAY_SIZE(allcountries); i++) {
 378                 if (allcountries[i].countrycode == countrycode)
 379                         return &allcountries[i];
 380         }
 381         return NULL;
 382 }
 383
 384 static u8 channel_plan_to_country_code(u8 channelplan)
 385 {
 386         switch (channelplan) {
 387         case 0x20:
 388         case 0x21:
 389                 return COUNTRY_CODE_WORLD_WIDE_13;
 390         case 0x22:
 391                 return COUNTRY_CODE_IC;
 392         case 0x25:
 393                 return COUNTRY_CODE_ETSI;
 394         case 0x32:
 395                 return COUNTRY_CODE_TELEC_NETGEAR;
 396         case 0x41:
 397                 return COUNTRY_CODE_GLOBAL_DOMAIN;
 398         case 0x7f:
 399                 return COUNTRY_CODE_WORLD_WIDE_13_5G_ALL;
 400         default:
 401                 return COUNTRY_CODE_MAX; /*Error*/
 402         }
 403 }
 404
 405 int rtl_regd_init(struct ieee80211_hw *hw,
 406                   void (*reg_notifier)(struct wiphy *wiphy,
 407                                        struct regulatory_request *request))
 408 {
 409         struct rtl_priv *rtlpriv = rtl_priv(hw);
 410         struct wiphy *wiphy = hw->wiphy;
 411         struct country_code_to_enum_rd *country = NULL;
 412
 413         if (!wiphy || !&rtlpriv->regd)
 414                 return -EINVAL;
 415
 416         /* init country_code from efuse channel plan */
 417         rtlpriv->regd.country_code =
 418                 channel_plan_to_country_code(rtlpriv->efuse.channel_plan);
 419
 420         RT_TRACE(rtlpriv, COMP_REGD, DBG_DMESG,
 421                  "rtl: EEPROM regdomain: 0x%0x country code: %d\n",
 422                  rtlpriv->efuse.channel_plan, rtlpriv->regd.country_code);
 423
 424         if (rtlpriv->regd.country_code >= COUNTRY_CODE_MAX) {
 425                 RT_TRACE(rtlpriv, COMP_REGD, DBG_DMESG,
 426                          "rtl: EEPROM indicates invalid country code, world wide 13 should be used\n");
 427
 428                 rtlpriv->regd.country_code = COUNTRY_CODE_WORLD_WIDE_13;
 429         }
 430
 431         country = _rtl_regd_find_country(rtlpriv->regd.country_code);
 432
 433         if (country) {
 434                 rtlpriv->regd.alpha2[0] = country->iso_name[0];
 435                 rtlpriv->regd.alpha2[1] = country->iso_name[1];
 436         } else {
 437                 rtlpriv->regd.alpha2[0] = '0';
 438                 rtlpriv->regd.alpha2[1] = '0';
 439         }
 440
 441         RT_TRACE(rtlpriv, COMP_REGD, DBG_TRACE,
 442                  "rtl: Country alpha2 being used: %c%c\n",
 443                   rtlpriv->regd.alpha2[0], rtlpriv->regd.alpha2[1]);
 444
 445         _rtl_regd_init_wiphy(&rtlpriv->regd, wiphy, reg_notifier);
 446
 447         return 0;
 448 }
 449
 450 void rtl_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 451 {
 452         struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 453         struct rtl_priv *rtlpriv = rtl_priv(hw);
 454
 455         RT_TRACE(rtlpriv, COMP_REGD, DBG_LOUD, "\n");
 456
 457         _rtl_reg_notifier_apply(wiphy, request, &rtlpriv->regd);
 458 }