2 * Copyright (c) 2008-2009 Atheros Communications Inc.
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.
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.
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19 #include <linux/kernel.h>
20 #include <linux/export.h>
21 #include <net/cfg80211.h>
22 #include <net/mac80211.h>
24 #include "regd_common.h"
26 static int __ath_regd_init(struct ath_regulatory *reg);
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.
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)
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)
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, 40, 0, 30,\
46 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
47 #define ATH9K_5GHZ_5470_5850 REG_RULE(5470-10, 5850+10, 40, 0, 30,\
48 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
49 #define ATH9K_5GHZ_5725_5850 REG_RULE(5725-10, 5850+10, 40, 0, 30,\
50 NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
52 #define ATH9K_2GHZ_ALL ATH9K_2GHZ_CH01_11, \
56 #define ATH9K_5GHZ_ALL ATH9K_5GHZ_5150_5350, \
59 /* This one skips what we call "mid band" */
60 #define ATH9K_5GHZ_NO_MIDBAND ATH9K_5GHZ_5150_5350, \
65 static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
74 /* Can be used by 0x63 and 0x65 */
75 static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
81 ATH9K_5GHZ_NO_MIDBAND,
85 /* Can be used by 0x64 only */
86 static const struct ieee80211_regdomain ath_world_regdom_64 = {
91 ATH9K_5GHZ_NO_MIDBAND,
95 /* Can be used by 0x66 and 0x69 */
96 static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
105 /* Can be used by 0x67, 0x68, 0x6A and 0x6C */
106 static const struct ieee80211_regdomain ath_world_regdom_67_68_6A_6C = {
116 static inline bool is_wwr_sku(u16 regd)
118 return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) &&
119 (((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
123 static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
125 return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
128 bool ath_is_world_regd(struct ath_regulatory *reg)
130 return is_wwr_sku(ath_regd_get_eepromRD(reg));
132 EXPORT_SYMBOL(ath_is_world_regd);
134 static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
136 /* this is the most restrictive */
137 return &ath_world_regdom_64;
141 ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
143 switch (reg->regpair->regDmnEnum) {
147 return &ath_world_regdom_60_61_62;
150 return &ath_world_regdom_63_65;
152 return &ath_world_regdom_64;
155 return &ath_world_regdom_66_69;
160 return &ath_world_regdom_67_68_6A_6C;
163 return ath_default_world_regdomain();
167 bool ath_is_49ghz_allowed(u16 regdomain)
170 return regdomain == MKK9_MKKC;
172 EXPORT_SYMBOL(ath_is_49ghz_allowed);
174 /* Frequency is one where radar detection is required */
175 static bool ath_is_radar_freq(u16 center_freq)
177 return (center_freq >= 5260 && center_freq <= 5700);
181 * N.B: These exception rules do not apply radar freqs.
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).
190 ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
191 enum nl80211_reg_initiator initiator)
193 enum ieee80211_band band;
194 struct ieee80211_supported_band *sband;
195 const struct ieee80211_reg_rule *reg_rule;
196 struct ieee80211_channel *ch;
200 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
202 if (!wiphy->bands[band])
205 sband = wiphy->bands[band];
207 for (i = 0; i < sband->n_channels; i++) {
209 ch = &sband->channels[i];
211 if (ath_is_radar_freq(ch->center_freq) ||
212 (ch->flags & IEEE80211_CHAN_RADAR))
215 if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
216 r = freq_reg_info(wiphy,
222 * If 11d had a rule for this channel ensure
223 * we enable adhoc/beaconing if it allows us to
224 * use it. Note that we would have disabled it
225 * by applying our static world regdomain by
226 * default during init, prior to calling our
229 if (!(reg_rule->flags &
230 NL80211_RRF_NO_IBSS))
232 ~IEEE80211_CHAN_NO_IBSS;
233 if (!(reg_rule->flags &
234 NL80211_RRF_PASSIVE_SCAN))
236 ~IEEE80211_CHAN_PASSIVE_SCAN;
238 if (ch->beacon_found)
239 ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
240 IEEE80211_CHAN_PASSIVE_SCAN);
247 /* Allows active scan scan on Ch 12 and 13 */
249 ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
250 enum nl80211_reg_initiator initiator)
252 struct ieee80211_supported_band *sband;
253 struct ieee80211_channel *ch;
254 const struct ieee80211_reg_rule *reg_rule;
257 sband = wiphy->bands[IEEE80211_BAND_2GHZ];
262 * If no country IE has been received always enable active scan
263 * on these channels. This is only done for specific regulatory SKUs
265 if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
266 ch = &sband->channels[11]; /* CH 12 */
267 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
268 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
269 ch = &sband->channels[12]; /* CH 13 */
270 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
271 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
276 * If a country IE has been received check its rule for this
277 * channel first before enabling active scan. The passive scan
278 * would have been enforced by the initial processing of our
279 * custom regulatory domain.
282 ch = &sband->channels[11]; /* CH 12 */
283 r = freq_reg_info(wiphy, ch->center_freq, ®_rule);
285 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
286 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
287 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
290 ch = &sband->channels[12]; /* CH 13 */
291 r = freq_reg_info(wiphy, ch->center_freq, ®_rule);
293 if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
294 if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
295 ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
299 /* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
300 static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
302 struct ieee80211_supported_band *sband;
303 struct ieee80211_channel *ch;
306 if (!wiphy->bands[IEEE80211_BAND_5GHZ])
309 sband = wiphy->bands[IEEE80211_BAND_5GHZ];
311 for (i = 0; i < sband->n_channels; i++) {
312 ch = &sband->channels[i];
313 if (!ath_is_radar_freq(ch->center_freq))
315 /* We always enable radar detection/DFS on this
316 * frequency range. Additionally we also apply on
317 * this frequency range:
318 * - If STA mode does not yet have DFS supports disable
320 * - If adhoc mode does not support DFS yet then
321 * disable adhoc in the frequency.
322 * - If AP mode does not yet support radar detection/DFS
323 * do not allow AP mode
325 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
326 ch->flags |= IEEE80211_CHAN_RADAR |
327 IEEE80211_CHAN_NO_IBSS |
328 IEEE80211_CHAN_PASSIVE_SCAN;
332 static void ath_reg_apply_world_flags(struct wiphy *wiphy,
333 enum nl80211_reg_initiator initiator,
334 struct ath_regulatory *reg)
336 switch (reg->regpair->regDmnEnum) {
342 ath_reg_apply_beaconing_flags(wiphy, initiator);
345 ath_reg_apply_beaconing_flags(wiphy, initiator);
346 ath_reg_apply_active_scan_flags(wiphy, initiator);
351 static u16 ath_regd_find_country_by_name(char *alpha2)
355 for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
356 if (!memcmp(allCountries[i].isoName, alpha2, 2))
357 return allCountries[i].countryCode;
363 int ath_reg_notifier_apply(struct wiphy *wiphy,
364 struct regulatory_request *request,
365 struct ath_regulatory *reg)
367 struct ath_common *common = container_of(reg, struct ath_common,
371 /* We always apply this */
372 ath_reg_apply_radar_flags(wiphy);
375 * This would happen when we have sent a custom regulatory request
376 * a world regulatory domain and the scheduler hasn't yet processed
377 * any pending requests in the queue.
382 switch (request->initiator) {
383 case NL80211_REGDOM_SET_BY_CORE:
385 * If common->reg_world_copy is world roaming it means we *were*
386 * world roaming... so we now have to restore that data.
388 if (!ath_is_world_regd(&common->reg_world_copy))
391 memcpy(reg, &common->reg_world_copy,
392 sizeof(struct ath_regulatory));
394 case NL80211_REGDOM_SET_BY_DRIVER:
395 case NL80211_REGDOM_SET_BY_USER:
397 case NL80211_REGDOM_SET_BY_COUNTRY_IE:
398 if (!ath_is_world_regd(reg))
401 country_code = ath_regd_find_country_by_name(request->alpha2);
402 if (country_code == (u16) -1)
405 reg->current_rd = COUNTRY_ERD_FLAG;
406 reg->current_rd |= country_code;
408 printk(KERN_DEBUG "ath: regdomain 0x%0x updated by CountryIE\n",
410 __ath_regd_init(reg);
412 ath_reg_apply_world_flags(wiphy, request->initiator, reg);
419 EXPORT_SYMBOL(ath_reg_notifier_apply);
421 static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
423 u16 rd = ath_regd_get_eepromRD(reg);
426 if (rd & COUNTRY_ERD_FLAG) {
427 /* EEPROM value is a country code */
428 u16 cc = rd & ~COUNTRY_ERD_FLAG;
430 "ath: EEPROM indicates we should expect "
432 for (i = 0; i < ARRAY_SIZE(allCountries); i++)
433 if (allCountries[i].countryCode == cc)
436 /* EEPROM value is a regpair value */
437 if (rd != CTRY_DEFAULT)
438 printk(KERN_DEBUG "ath: EEPROM indicates we "
439 "should expect a direct regpair map\n");
440 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
441 if (regDomainPairs[i].regDmnEnum == rd)
445 "ath: invalid regulatory domain/country code 0x%x\n", rd);
449 /* EEPROM country code to regpair mapping */
450 static struct country_code_to_enum_rd*
451 ath_regd_find_country(u16 countryCode)
455 for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
456 if (allCountries[i].countryCode == countryCode)
457 return &allCountries[i];
462 /* EEPROM rd code to regpair mapping */
463 static struct country_code_to_enum_rd*
464 ath_regd_find_country_by_rd(int regdmn)
468 for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
469 if (allCountries[i].regDmnEnum == regdmn)
470 return &allCountries[i];
475 /* Returns the map of the EEPROM set RD to a country code */
476 static u16 ath_regd_get_default_country(u16 rd)
478 if (rd & COUNTRY_ERD_FLAG) {
479 struct country_code_to_enum_rd *country = NULL;
480 u16 cc = rd & ~COUNTRY_ERD_FLAG;
482 country = ath_regd_find_country(cc);
490 static struct reg_dmn_pair_mapping*
491 ath_get_regpair(int regdmn)
495 if (regdmn == NO_ENUMRD)
497 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
498 if (regDomainPairs[i].regDmnEnum == regdmn)
499 return ®DomainPairs[i];
505 ath_regd_init_wiphy(struct ath_regulatory *reg,
507 int (*reg_notifier)(struct wiphy *wiphy,
508 struct regulatory_request *request))
510 const struct ieee80211_regdomain *regd;
512 wiphy->reg_notifier = reg_notifier;
513 wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;
515 if (ath_is_world_regd(reg)) {
517 * Anything applied here (prior to wiphy registration) gets
518 * saved on the wiphy orig_* parameters
520 regd = ath_world_regdomain(reg);
521 wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
524 * This gets applied in the case of the absence of CRDA,
525 * it's our own custom world regulatory domain, similar to
526 * cfg80211's but we enable passive scanning.
528 regd = ath_default_world_regdomain();
530 wiphy_apply_custom_regulatory(wiphy, regd);
531 ath_reg_apply_radar_flags(wiphy);
532 ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
537 * Some users have reported their EEPROM programmed with
538 * 0x8000 set, this is not a supported regulatory domain
539 * but since we have more than one user with it we need
540 * a solution for them. We default to 0x64, which is the
541 * default Atheros world regulatory domain.
543 static void ath_regd_sanitize(struct ath_regulatory *reg)
545 if (reg->current_rd != COUNTRY_ERD_FLAG)
547 printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
548 reg->current_rd = 0x64;
551 static int __ath_regd_init(struct ath_regulatory *reg)
553 struct country_code_to_enum_rd *country = NULL;
559 ath_regd_sanitize(reg);
561 printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);
563 if (!ath_regd_is_eeprom_valid(reg)) {
564 pr_err("Invalid EEPROM contents\n");
568 regdmn = ath_regd_get_eepromRD(reg);
569 reg->country_code = ath_regd_get_default_country(regdmn);
571 if (reg->country_code == CTRY_DEFAULT &&
572 regdmn == CTRY_DEFAULT) {
573 printk(KERN_DEBUG "ath: EEPROM indicates default "
574 "country code should be used\n");
575 reg->country_code = CTRY_UNITED_STATES;
578 if (reg->country_code == CTRY_DEFAULT) {
581 printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
583 country = ath_regd_find_country(reg->country_code);
584 if (country == NULL) {
586 "ath: no valid country maps found for "
587 "country code: 0x%0x\n",
591 regdmn = country->regDmnEnum;
592 printk(KERN_DEBUG "ath: country maps to "
593 "regdmn code: 0x%0x\n",
598 reg->regpair = ath_get_regpair(regdmn);
601 printk(KERN_DEBUG "ath: "
602 "No regulatory domain pair found, cannot continue\n");
607 country = ath_regd_find_country_by_rd(regdmn);
610 reg->alpha2[0] = country->isoName[0];
611 reg->alpha2[1] = country->isoName[1];
613 reg->alpha2[0] = '0';
614 reg->alpha2[1] = '0';
617 printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
618 reg->alpha2[0], reg->alpha2[1]);
619 printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
620 reg->regpair->regDmnEnum);
626 ath_regd_init(struct ath_regulatory *reg,
628 int (*reg_notifier)(struct wiphy *wiphy,
629 struct regulatory_request *request))
631 struct ath_common *common = container_of(reg, struct ath_common,
635 r = __ath_regd_init(reg);
639 if (ath_is_world_regd(reg))
640 memcpy(&common->reg_world_copy, reg,
641 sizeof(struct ath_regulatory));
643 ath_regd_init_wiphy(reg, wiphy, reg_notifier);
647 EXPORT_SYMBOL(ath_regd_init);
649 u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
650 enum ieee80211_band band)
653 (reg->country_code == CTRY_DEFAULT &&
654 is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
659 case IEEE80211_BAND_2GHZ:
660 return reg->regpair->reg_2ghz_ctl;
661 case IEEE80211_BAND_5GHZ:
662 return reg->regpair->reg_5ghz_ctl;
667 EXPORT_SYMBOL(ath_regd_get_band_ctl);