regd.c revision 8a3b6c800a993bbc7559bcfa77a34e4fc633cf0e
1/* 2 * Copyright (c) 2008-2009 Atheros Communications Inc. 3 * 4 * Permission to use, copy, modify, and/or distribute this software for any 5 * purpose with or without fee is hereby granted, provided that the above 6 * copyright notice and this permission notice appear in all copies. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 15 */ 16 17#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 18 19#include <linux/kernel.h> 20#include <linux/export.h> 21#include <net/cfg80211.h> 22#include <net/mac80211.h> 23#include "regd.h" 24#include "regd_common.h" 25 26static int __ath_regd_init(struct ath_regulatory *reg); 27 28/* 29 * This is a set of common rules used by our world regulatory domains. 30 * We have 12 world regulatory domains. To save space we consolidate 31 * the regulatory domains in 5 structures by frequency and change 32 * the flags on our reg_notifier() on a case by case basis. 33 */ 34 35/* Only these channels all allow active scan on all world regulatory domains */ 36#define ATH9K_2GHZ_CH01_11 REG_RULE(2412-10, 2462+10, 40, 0, 20, 0) 37 38/* We enable active scan on these a case by case basis by regulatory domain */ 39#define ATH9K_2GHZ_CH12_13 REG_RULE(2467-10, 2472+10, 40, 0, 20,\ 40 NL80211_RRF_PASSIVE_SCAN) 41#define ATH9K_2GHZ_CH14 REG_RULE(2484-10, 2484+10, 40, 0, 20,\ 42 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_OFDM) 43 44/* We allow IBSS on these on a case by case basis by regulatory domain */ 45#define ATH9K_5GHZ_5150_5350 REG_RULE(5150-10, 5350+10, 80, 0, 30,\ 46 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS) 47#define ATH9K_5GHZ_5470_5850 REG_RULE(5470-10, 5850+10, 80, 0, 30,\ 48 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS) 49#define ATH9K_5GHZ_5725_5850 REG_RULE(5725-10, 5850+10, 80, 0, 30,\ 50 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS) 51 52#define ATH9K_2GHZ_ALL ATH9K_2GHZ_CH01_11, \ 53 ATH9K_2GHZ_CH12_13, \ 54 ATH9K_2GHZ_CH14 55 56#define ATH9K_5GHZ_ALL ATH9K_5GHZ_5150_5350, \ 57 ATH9K_5GHZ_5470_5850 58 59/* This one skips what we call "mid band" */ 60#define ATH9K_5GHZ_NO_MIDBAND ATH9K_5GHZ_5150_5350, \ 61 ATH9K_5GHZ_5725_5850 62 63/* Can be used for: 64 * 0x60, 0x61, 0x62 */ 65static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = { 66 .n_reg_rules = 5, 67 .alpha2 = "99", 68 .reg_rules = { 69 ATH9K_2GHZ_ALL, 70 ATH9K_5GHZ_ALL, 71 } 72}; 73 74/* Can be used by 0x63 and 0x65 */ 75static const struct ieee80211_regdomain ath_world_regdom_63_65 = { 76 .n_reg_rules = 4, 77 .alpha2 = "99", 78 .reg_rules = { 79 ATH9K_2GHZ_CH01_11, 80 ATH9K_2GHZ_CH12_13, 81 ATH9K_5GHZ_NO_MIDBAND, 82 } 83}; 84 85/* Can be used by 0x64 only */ 86static const struct ieee80211_regdomain ath_world_regdom_64 = { 87 .n_reg_rules = 3, 88 .alpha2 = "99", 89 .reg_rules = { 90 ATH9K_2GHZ_CH01_11, 91 ATH9K_5GHZ_NO_MIDBAND, 92 } 93}; 94 95/* Can be used by 0x66 and 0x69 */ 96static const struct ieee80211_regdomain ath_world_regdom_66_69 = { 97 .n_reg_rules = 3, 98 .alpha2 = "99", 99 .reg_rules = { 100 ATH9K_2GHZ_CH01_11, 101 ATH9K_5GHZ_ALL, 102 } 103}; 104 105/* Can be used by 0x67, 0x68, 0x6A and 0x6C */ 106static const struct ieee80211_regdomain ath_world_regdom_67_68_6A_6C = { 107 .n_reg_rules = 4, 108 .alpha2 = "99", 109 .reg_rules = { 110 ATH9K_2GHZ_CH01_11, 111 ATH9K_2GHZ_CH12_13, 112 ATH9K_5GHZ_ALL, 113 } 114}; 115 116static inline bool is_wwr_sku(u16 regd) 117{ 118 return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) && 119 (((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) || 120 (regd == WORLD)); 121} 122 123static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg) 124{ 125 return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG; 126} 127 128bool ath_is_world_regd(struct ath_regulatory *reg) 129{ 130 return is_wwr_sku(ath_regd_get_eepromRD(reg)); 131} 132EXPORT_SYMBOL(ath_is_world_regd); 133 134static const struct ieee80211_regdomain *ath_default_world_regdomain(void) 135{ 136 /* this is the most restrictive */ 137 return &ath_world_regdom_64; 138} 139 140static const struct 141ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg) 142{ 143 switch (reg->regpair->regDmnEnum) { 144 case 0x60: 145 case 0x61: 146 case 0x62: 147 return &ath_world_regdom_60_61_62; 148 case 0x63: 149 case 0x65: 150 return &ath_world_regdom_63_65; 151 case 0x64: 152 return &ath_world_regdom_64; 153 case 0x66: 154 case 0x69: 155 return &ath_world_regdom_66_69; 156 case 0x67: 157 case 0x68: 158 case 0x6A: 159 case 0x6C: 160 return &ath_world_regdom_67_68_6A_6C; 161 default: 162 WARN_ON(1); 163 return ath_default_world_regdomain(); 164 } 165} 166 167bool ath_is_49ghz_allowed(u16 regdomain) 168{ 169 /* possibly more */ 170 return regdomain == MKK9_MKKC; 171} 172EXPORT_SYMBOL(ath_is_49ghz_allowed); 173 174/* Frequency is one where radar detection is required */ 175static bool ath_is_radar_freq(u16 center_freq) 176{ 177 return (center_freq >= 5260 && center_freq <= 5700); 178} 179 180/* 181 * N.B: These exception rules do not apply radar freqs. 182 * 183 * - We enable adhoc (or beaconing) if allowed by 11d 184 * - We enable active scan if the channel is allowed by 11d 185 * - If no country IE has been processed and a we determine we have 186 * received a beacon on a channel we can enable active scan and 187 * adhoc (or beaconing). 188 */ 189static void 190ath_reg_apply_beaconing_flags(struct wiphy *wiphy, 191 enum nl80211_reg_initiator initiator) 192{ 193 enum ieee80211_band band; 194 struct ieee80211_supported_band *sband; 195 const struct ieee80211_reg_rule *reg_rule; 196 struct ieee80211_channel *ch; 197 unsigned int i; 198 199 for (band = 0; band < IEEE80211_NUM_BANDS; band++) { 200 201 if (!wiphy->bands[band]) 202 continue; 203 204 sband = wiphy->bands[band]; 205 206 for (i = 0; i < sband->n_channels; i++) { 207 208 ch = &sband->channels[i]; 209 210 if (ath_is_radar_freq(ch->center_freq) || 211 (ch->flags & IEEE80211_CHAN_RADAR)) 212 continue; 213 214 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) { 215 reg_rule = freq_reg_info(wiphy, ch->center_freq); 216 if (IS_ERR(reg_rule)) 217 continue; 218 /* 219 * If 11d had a rule for this channel ensure 220 * we enable adhoc/beaconing if it allows us to 221 * use it. Note that we would have disabled it 222 * by applying our static world regdomain by 223 * default during init, prior to calling our 224 * regulatory_hint(). 225 */ 226 if (!(reg_rule->flags & 227 NL80211_RRF_NO_IBSS)) 228 ch->flags &= 229 ~IEEE80211_CHAN_NO_IBSS; 230 if (!(reg_rule->flags & 231 NL80211_RRF_PASSIVE_SCAN)) 232 ch->flags &= 233 ~IEEE80211_CHAN_PASSIVE_SCAN; 234 } else { 235 if (ch->beacon_found) 236 ch->flags &= ~(IEEE80211_CHAN_NO_IBSS | 237 IEEE80211_CHAN_PASSIVE_SCAN); 238 } 239 } 240 } 241 242} 243 244/* Allows active scan scan on Ch 12 and 13 */ 245static void 246ath_reg_apply_active_scan_flags(struct wiphy *wiphy, 247 enum nl80211_reg_initiator initiator) 248{ 249 struct ieee80211_supported_band *sband; 250 struct ieee80211_channel *ch; 251 const struct ieee80211_reg_rule *reg_rule; 252 253 sband = wiphy->bands[IEEE80211_BAND_2GHZ]; 254 if (!sband) 255 return; 256 257 /* 258 * If no country IE has been received always enable active scan 259 * on these channels. This is only done for specific regulatory SKUs 260 */ 261 if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) { 262 ch = &sband->channels[11]; /* CH 12 */ 263 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN) 264 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; 265 ch = &sband->channels[12]; /* CH 13 */ 266 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN) 267 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; 268 return; 269 } 270 271 /* 272 * If a country IE has been received check its rule for this 273 * channel first before enabling active scan. The passive scan 274 * would have been enforced by the initial processing of our 275 * custom regulatory domain. 276 */ 277 278 ch = &sband->channels[11]; /* CH 12 */ 279 reg_rule = freq_reg_info(wiphy, ch->center_freq); 280 if (!IS_ERR(reg_rule)) { 281 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN)) 282 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN) 283 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; 284 } 285 286 ch = &sband->channels[12]; /* CH 13 */ 287 reg_rule = freq_reg_info(wiphy, ch->center_freq); 288 if (!IS_ERR(reg_rule)) { 289 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN)) 290 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN) 291 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN; 292 } 293} 294 295/* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */ 296static void ath_reg_apply_radar_flags(struct wiphy *wiphy) 297{ 298 struct ieee80211_supported_band *sband; 299 struct ieee80211_channel *ch; 300 unsigned int i; 301 302 if (!wiphy->bands[IEEE80211_BAND_5GHZ]) 303 return; 304 305 sband = wiphy->bands[IEEE80211_BAND_5GHZ]; 306 307 for (i = 0; i < sband->n_channels; i++) { 308 ch = &sband->channels[i]; 309 if (!ath_is_radar_freq(ch->center_freq)) 310 continue; 311 /* We always enable radar detection/DFS on this 312 * frequency range. Additionally we also apply on 313 * this frequency range: 314 * - If STA mode does not yet have DFS supports disable 315 * active scanning 316 * - If adhoc mode does not support DFS yet then 317 * disable adhoc in the frequency. 318 * - If AP mode does not yet support radar detection/DFS 319 * do not allow AP mode 320 */ 321 if (!(ch->flags & IEEE80211_CHAN_DISABLED)) 322 ch->flags |= IEEE80211_CHAN_RADAR | 323 IEEE80211_CHAN_NO_IBSS | 324 IEEE80211_CHAN_PASSIVE_SCAN; 325 } 326} 327 328static void ath_reg_apply_world_flags(struct wiphy *wiphy, 329 enum nl80211_reg_initiator initiator, 330 struct ath_regulatory *reg) 331{ 332 switch (reg->regpair->regDmnEnum) { 333 case 0x60: 334 case 0x63: 335 case 0x66: 336 case 0x67: 337 case 0x6C: 338 ath_reg_apply_beaconing_flags(wiphy, initiator); 339 break; 340 case 0x68: 341 ath_reg_apply_beaconing_flags(wiphy, initiator); 342 ath_reg_apply_active_scan_flags(wiphy, initiator); 343 break; 344 } 345} 346 347static u16 ath_regd_find_country_by_name(char *alpha2) 348{ 349 unsigned int i; 350 351 for (i = 0; i < ARRAY_SIZE(allCountries); i++) { 352 if (!memcmp(allCountries[i].isoName, alpha2, 2)) 353 return allCountries[i].countryCode; 354 } 355 356 return -1; 357} 358 359static int __ath_reg_dyn_country(struct wiphy *wiphy, 360 struct ath_regulatory *reg, 361 struct regulatory_request *request) 362{ 363 u16 country_code; 364 365 if (!ath_is_world_regd(reg)) 366 return -EINVAL; 367 368 country_code = ath_regd_find_country_by_name(request->alpha2); 369 if (country_code == (u16) -1) 370 return -EINVAL; 371 372 reg->current_rd = COUNTRY_ERD_FLAG; 373 reg->current_rd |= country_code; 374 375 __ath_regd_init(reg); 376 377 ath_reg_apply_world_flags(wiphy, request->initiator, reg); 378 379 return 0; 380} 381 382static void ath_reg_dyn_country(struct wiphy *wiphy, 383 struct ath_regulatory *reg, 384 struct regulatory_request *request) 385{ 386 if (__ath_reg_dyn_country(wiphy, reg, request)) 387 return; 388 389 printk(KERN_DEBUG "ath: regdomain 0x%0x " 390 "dynamically updated by %s\n", 391 reg->current_rd, 392 reg_initiator_name(request->initiator)); 393} 394 395void ath_reg_notifier_apply(struct wiphy *wiphy, 396 struct regulatory_request *request, 397 struct ath_regulatory *reg) 398{ 399 struct ath_common *common = container_of(reg, struct ath_common, 400 regulatory); 401 /* We always apply this */ 402 ath_reg_apply_radar_flags(wiphy); 403 404 /* 405 * This would happen when we have sent a custom regulatory request 406 * a world regulatory domain and the scheduler hasn't yet processed 407 * any pending requests in the queue. 408 */ 409 if (!request) 410 return; 411 412 switch (request->initiator) { 413 case NL80211_REGDOM_SET_BY_CORE: 414 /* 415 * If common->reg_world_copy is world roaming it means we *were* 416 * world roaming... so we now have to restore that data. 417 */ 418 if (!ath_is_world_regd(&common->reg_world_copy)) 419 break; 420 421 memcpy(reg, &common->reg_world_copy, 422 sizeof(struct ath_regulatory)); 423 break; 424 case NL80211_REGDOM_SET_BY_DRIVER: 425 case NL80211_REGDOM_SET_BY_USER: 426 break; 427 case NL80211_REGDOM_SET_BY_COUNTRY_IE: 428 ath_reg_dyn_country(wiphy, reg, request); 429 break; 430 } 431} 432EXPORT_SYMBOL(ath_reg_notifier_apply); 433 434static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg) 435{ 436 u16 rd = ath_regd_get_eepromRD(reg); 437 int i; 438 439 if (rd & COUNTRY_ERD_FLAG) { 440 /* EEPROM value is a country code */ 441 u16 cc = rd & ~COUNTRY_ERD_FLAG; 442 printk(KERN_DEBUG 443 "ath: EEPROM indicates we should expect " 444 "a country code\n"); 445 for (i = 0; i < ARRAY_SIZE(allCountries); i++) 446 if (allCountries[i].countryCode == cc) 447 return true; 448 } else { 449 /* EEPROM value is a regpair value */ 450 if (rd != CTRY_DEFAULT) 451 printk(KERN_DEBUG "ath: EEPROM indicates we " 452 "should expect a direct regpair map\n"); 453 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) 454 if (regDomainPairs[i].regDmnEnum == rd) 455 return true; 456 } 457 printk(KERN_DEBUG 458 "ath: invalid regulatory domain/country code 0x%x\n", rd); 459 return false; 460} 461 462/* EEPROM country code to regpair mapping */ 463static struct country_code_to_enum_rd* 464ath_regd_find_country(u16 countryCode) 465{ 466 int i; 467 468 for (i = 0; i < ARRAY_SIZE(allCountries); i++) { 469 if (allCountries[i].countryCode == countryCode) 470 return &allCountries[i]; 471 } 472 return NULL; 473} 474 475/* EEPROM rd code to regpair mapping */ 476static struct country_code_to_enum_rd* 477ath_regd_find_country_by_rd(int regdmn) 478{ 479 int i; 480 481 for (i = 0; i < ARRAY_SIZE(allCountries); i++) { 482 if (allCountries[i].regDmnEnum == regdmn) 483 return &allCountries[i]; 484 } 485 return NULL; 486} 487 488/* Returns the map of the EEPROM set RD to a country code */ 489static u16 ath_regd_get_default_country(u16 rd) 490{ 491 if (rd & COUNTRY_ERD_FLAG) { 492 struct country_code_to_enum_rd *country = NULL; 493 u16 cc = rd & ~COUNTRY_ERD_FLAG; 494 495 country = ath_regd_find_country(cc); 496 if (country != NULL) 497 return cc; 498 } 499 500 return CTRY_DEFAULT; 501} 502 503static struct reg_dmn_pair_mapping* 504ath_get_regpair(int regdmn) 505{ 506 int i; 507 508 if (regdmn == NO_ENUMRD) 509 return NULL; 510 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) { 511 if (regDomainPairs[i].regDmnEnum == regdmn) 512 return ®DomainPairs[i]; 513 } 514 return NULL; 515} 516 517static int 518ath_regd_init_wiphy(struct ath_regulatory *reg, 519 struct wiphy *wiphy, 520 void (*reg_notifier)(struct wiphy *wiphy, 521 struct regulatory_request *request)) 522{ 523 const struct ieee80211_regdomain *regd; 524 525 wiphy->reg_notifier = reg_notifier; 526 wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY; 527 528 if (ath_is_world_regd(reg)) { 529 /* 530 * Anything applied here (prior to wiphy registration) gets 531 * saved on the wiphy orig_* parameters 532 */ 533 regd = ath_world_regdomain(reg); 534 wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY; 535 } else { 536 /* 537 * This gets applied in the case of the absence of CRDA, 538 * it's our own custom world regulatory domain, similar to 539 * cfg80211's but we enable passive scanning. 540 */ 541 regd = ath_default_world_regdomain(); 542 } 543 wiphy_apply_custom_regulatory(wiphy, regd); 544 ath_reg_apply_radar_flags(wiphy); 545 ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg); 546 return 0; 547} 548 549/* 550 * Some users have reported their EEPROM programmed with 551 * 0x8000 set, this is not a supported regulatory domain 552 * but since we have more than one user with it we need 553 * a solution for them. We default to 0x64, which is the 554 * default Atheros world regulatory domain. 555 */ 556static void ath_regd_sanitize(struct ath_regulatory *reg) 557{ 558 if (reg->current_rd != COUNTRY_ERD_FLAG) 559 return; 560 printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n"); 561 reg->current_rd = 0x64; 562} 563 564static int __ath_regd_init(struct ath_regulatory *reg) 565{ 566 struct country_code_to_enum_rd *country = NULL; 567 u16 regdmn; 568 569 if (!reg) 570 return -EINVAL; 571 572 ath_regd_sanitize(reg); 573 574 printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd); 575 576 if (!ath_regd_is_eeprom_valid(reg)) { 577 pr_err("Invalid EEPROM contents\n"); 578 return -EINVAL; 579 } 580 581 regdmn = ath_regd_get_eepromRD(reg); 582 reg->country_code = ath_regd_get_default_country(regdmn); 583 584 if (reg->country_code == CTRY_DEFAULT && 585 regdmn == CTRY_DEFAULT) { 586 printk(KERN_DEBUG "ath: EEPROM indicates default " 587 "country code should be used\n"); 588 reg->country_code = CTRY_UNITED_STATES; 589 } 590 591 if (reg->country_code == CTRY_DEFAULT) { 592 country = NULL; 593 } else { 594 printk(KERN_DEBUG "ath: doing EEPROM country->regdmn " 595 "map search\n"); 596 country = ath_regd_find_country(reg->country_code); 597 if (country == NULL) { 598 printk(KERN_DEBUG 599 "ath: no valid country maps found for " 600 "country code: 0x%0x\n", 601 reg->country_code); 602 return -EINVAL; 603 } else { 604 regdmn = country->regDmnEnum; 605 printk(KERN_DEBUG "ath: country maps to " 606 "regdmn code: 0x%0x\n", 607 regdmn); 608 } 609 } 610 611 reg->regpair = ath_get_regpair(regdmn); 612 613 if (!reg->regpair) { 614 printk(KERN_DEBUG "ath: " 615 "No regulatory domain pair found, cannot continue\n"); 616 return -EINVAL; 617 } 618 619 if (!country) 620 country = ath_regd_find_country_by_rd(regdmn); 621 622 if (country) { 623 reg->alpha2[0] = country->isoName[0]; 624 reg->alpha2[1] = country->isoName[1]; 625 } else { 626 reg->alpha2[0] = '0'; 627 reg->alpha2[1] = '0'; 628 } 629 630 printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n", 631 reg->alpha2[0], reg->alpha2[1]); 632 printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n", 633 reg->regpair->regDmnEnum); 634 635 return 0; 636} 637 638int 639ath_regd_init(struct ath_regulatory *reg, 640 struct wiphy *wiphy, 641 void (*reg_notifier)(struct wiphy *wiphy, 642 struct regulatory_request *request)) 643{ 644 struct ath_common *common = container_of(reg, struct ath_common, 645 regulatory); 646 int r; 647 648 r = __ath_regd_init(reg); 649 if (r) 650 return r; 651 652 if (ath_is_world_regd(reg)) 653 memcpy(&common->reg_world_copy, reg, 654 sizeof(struct ath_regulatory)); 655 656 ath_regd_init_wiphy(reg, wiphy, reg_notifier); 657 658 return 0; 659} 660EXPORT_SYMBOL(ath_regd_init); 661 662u32 ath_regd_get_band_ctl(struct ath_regulatory *reg, 663 enum ieee80211_band band) 664{ 665 if (!reg->regpair || 666 (reg->country_code == CTRY_DEFAULT && 667 is_wwr_sku(ath_regd_get_eepromRD(reg)))) { 668 return SD_NO_CTL; 669 } 670 671 switch (band) { 672 case IEEE80211_BAND_2GHZ: 673 return reg->regpair->reg_2ghz_ctl; 674 case IEEE80211_BAND_5GHZ: 675 return reg->regpair->reg_5ghz_ctl; 676 default: 677 return NO_CTL; 678 } 679} 680EXPORT_SYMBOL(ath_regd_get_band_ctl); 681