drivers/net/wireless/ath/regd.c - linux - Git at Google

 /*
  * Copyright (c) 2008-2009 Atheros Communications Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */

 #include <linux/kernel.h>
 #include <net/cfg80211.h>
 #include <net/mac80211.h>
 #include "regd.h"
 #include "regd_common.h"

 /*
  * This is a set of common rules used by our world regulatory domains.
  * We have 12 world regulatory domains. To save space we consolidate
  * the regulatory domains in 5 structures by frequency and change
  * the flags on our reg_notifier() on a case by case basis.
  */

 /* Only these channels all allow active scan on all world regulatory domains */
 #define ATH9K_2GHZ_CH01_11	REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)

 /* We enable active scan on these a case by case basis by regulatory domain */
 #define ATH9K_2GHZ_CH12_13	REG_RULE(2467-10, 2472+10, 40, 0, 20,\
 					NL80211_RRF_PASSIVE_SCAN)
 #define ATH9K_2GHZ_CH14		REG_RULE(2484-10, 2484+10, 40, 0, 20,\
 				NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_OFDM)

 /* We allow IBSS on these on a case by case basis by regulatory domain */
 #define ATH9K_5GHZ_5150_5350	REG_RULE(5150-10, 5350+10, 40, 0, 30,\
 				NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
 #define ATH9K_5GHZ_5470_5850	REG_RULE(5470-10, 5850+10, 40, 0, 30,\
 				NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)
 #define ATH9K_5GHZ_5725_5850	REG_RULE(5725-10, 5850+10, 40, 0, 30,\
 				NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_IBSS)

 #define ATH9K_2GHZ_ALL		ATH9K_2GHZ_CH01_11, \
 				ATH9K_2GHZ_CH12_13, \
 				ATH9K_2GHZ_CH14

 #define ATH9K_5GHZ_ALL		ATH9K_5GHZ_5150_5350, \
 				ATH9K_5GHZ_5470_5850

 /* This one skips what we call "mid band" */
 #define ATH9K_5GHZ_NO_MIDBAND	ATH9K_5GHZ_5150_5350, \
 				ATH9K_5GHZ_5725_5850

 /* Can be used for:
  * 0x60, 0x61, 0x62 */
 static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
 	.n_reg_rules = 5,
 	.alpha2 =  "99",
 	.reg_rules = {
 		ATH9K_2GHZ_ALL,
 		ATH9K_5GHZ_ALL,
 	}
 };

 /* Can be used by 0x63 and 0x65 */
 static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
 	.n_reg_rules = 4,
 	.alpha2 =  "99",
 	.reg_rules = {
 		ATH9K_2GHZ_CH01_11,
 		ATH9K_2GHZ_CH12_13,
 		ATH9K_5GHZ_NO_MIDBAND,
 	}
 };

 /* Can be used by 0x64 only */
 static const struct ieee80211_regdomain ath_world_regdom_64 = {
 	.n_reg_rules = 3,
 	.alpha2 =  "99",
 	.reg_rules = {
 		ATH9K_2GHZ_CH01_11,
 		ATH9K_5GHZ_NO_MIDBAND,
 	}
 };

 /* Can be used by 0x66 and 0x69 */
 static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
 	.n_reg_rules = 3,
 	.alpha2 =  "99",
 	.reg_rules = {
 		ATH9K_2GHZ_CH01_11,
 		ATH9K_5GHZ_ALL,
 	}
 };

 /* Can be used by 0x67, 0x6A and 0x68 */
 static const struct ieee80211_regdomain ath_world_regdom_67_68_6A = {
 	.n_reg_rules = 4,
 	.alpha2 =  "99",
 	.reg_rules = {
 		ATH9K_2GHZ_CH01_11,
 		ATH9K_2GHZ_CH12_13,
 		ATH9K_5GHZ_ALL,
 	}
 };

 static inline bool is_wwr_sku(u16 regd)
 {
 	return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) &&
 		(((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
 		(regd == WORLD));
 }

 static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
 {
 	return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
 }

 bool ath_is_world_regd(struct ath_regulatory *reg)
 {
 	return is_wwr_sku(ath_regd_get_eepromRD(reg));
 }
 EXPORT_SYMBOL(ath_is_world_regd);

 static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
 {
 	/* this is the most restrictive */
 	return &ath_world_regdom_64;
 }

 static const struct
 ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
 {
 	switch (reg->regpair->regDmnEnum) {
 	case 0x60:
 	case 0x61:
 	case 0x62:
 		return &ath_world_regdom_60_61_62;
 	case 0x63:
 	case 0x65:
 		return &ath_world_regdom_63_65;
 	case 0x64:
 		return &ath_world_regdom_64;
 	case 0x66:
 	case 0x69:
 		return &ath_world_regdom_66_69;
 	case 0x67:
 	case 0x68:
 	case 0x6A:
 		return &ath_world_regdom_67_68_6A;
 	default:
 		WARN_ON(1);
 		return ath_default_world_regdomain();
 	}
 }

 /* Frequency is one where radar detection is required */
 static bool ath_is_radar_freq(u16 center_freq)
 {
 	return (center_freq >= 5260 && center_freq <= 5700);
 }

 /*
  * N.B: These exception rules do not apply radar freqs.
  *
  * - We enable adhoc (or beaconing) if allowed by 11d
  * - We enable active scan if the channel is allowed by 11d
  * - If no country IE has been processed and a we determine we have
  *   received a beacon on a channel we can enable active scan and
  *   adhoc (or beaconing).
  */
 static void
 ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
 			      enum nl80211_reg_initiator initiator)
 {
 	enum ieee80211_band band;
 	struct ieee80211_supported_band *sband;
 	const struct ieee80211_reg_rule *reg_rule;
 	struct ieee80211_channel *ch;
 	unsigned int i;
 	u32 bandwidth = 0;
 	int r;

 	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {

 		if (!wiphy->bands[band])
 			continue;

 		sband = wiphy->bands[band];

 		for (i = 0; i < sband->n_channels; i++) {

 			ch = &sband->channels[i];

 			if (ath_is_radar_freq(ch->center_freq) ||
 			    (ch->flags & IEEE80211_CHAN_RADAR))
 				continue;

 			if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 				r = freq_reg_info(wiphy,
 						  ch->center_freq,
 						  bandwidth,
 						  &reg_rule);
 				if (r)
 					continue;
 				/*
 				 * If 11d had a rule for this channel ensure
 				 * we enable adhoc/beaconing if it allows us to
 				 * use it. Note that we would have disabled it
 				 * by applying our static world regdomain by
 				 * default during init, prior to calling our
 				 * regulatory_hint().
 				 */
 				if (!(reg_rule->flags &
 				    NL80211_RRF_NO_IBSS))
 					ch->flags &=
 					  ~IEEE80211_CHAN_NO_IBSS;
 				if (!(reg_rule->flags &
 				    NL80211_RRF_PASSIVE_SCAN))
 					ch->flags &=
 					  ~IEEE80211_CHAN_PASSIVE_SCAN;
 			} else {
 				if (ch->beacon_found)
 					ch->flags &= ~(IEEE80211_CHAN_NO_IBSS |
 					  IEEE80211_CHAN_PASSIVE_SCAN);
 			}
 		}
 	}

 }

 /* Allows active scan scan on Ch 12 and 13 */
 static void
 ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
 				enum nl80211_reg_initiator initiator)
 {
 	struct ieee80211_supported_band *sband;
 	struct ieee80211_channel *ch;
 	const struct ieee80211_reg_rule *reg_rule;
 	u32 bandwidth = 0;
 	int r;

 	sband = wiphy->bands[IEEE80211_BAND_2GHZ];

 	/*
 	 * If no country IE has been received always enable active scan
 	 * on these channels. This is only done for specific regulatory SKUs
 	 */
 	if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
 		ch = &sband->channels[11]; /* CH 12 */
 		if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 			ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 		ch = &sband->channels[12]; /* CH 13 */
 		if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 			ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 		return;
 	}

 	/*
 	 * If a country IE has been recieved check its rule for this
 	 * channel first before enabling active scan. The passive scan
 	 * would have been enforced by the initial processing of our
 	 * custom regulatory domain.
 	 */

 	ch = &sband->channels[11]; /* CH 12 */
 	r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 	if (!r) {
 		if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 			if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 				ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 	}

 	ch = &sband->channels[12]; /* CH 13 */
 	r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
 	if (!r) {
 		if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 			if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
 				ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 	}
 }

 /* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
 static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
 {
 	struct ieee80211_supported_band *sband;
 	struct ieee80211_channel *ch;
 	unsigned int i;

 	if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 		return;

 	sband = wiphy->bands[IEEE80211_BAND_5GHZ];

 	for (i = 0; i < sband->n_channels; i++) {
 		ch = &sband->channels[i];
 		if (!ath_is_radar_freq(ch->center_freq))
 			continue;
 		/* We always enable radar detection/DFS on this
 		 * frequency range. Additionally we also apply on
 		 * this frequency range:
 		 * - If STA mode does not yet have DFS supports disable
 		 *   active scanning
 		 * - If adhoc mode does not support DFS yet then
 		 *   disable adhoc in the frequency.
 		 * - If AP mode does not yet support radar detection/DFS
 		 *   do not allow AP mode
 		 */
 		if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 			ch->flags |= IEEE80211_CHAN_RADAR |
 				     IEEE80211_CHAN_NO_IBSS |
 				     IEEE80211_CHAN_PASSIVE_SCAN;
 	}
 }

 static void ath_reg_apply_world_flags(struct wiphy *wiphy,
 				      enum nl80211_reg_initiator initiator,
 				      struct ath_regulatory *reg)
 {
 	switch (reg->regpair->regDmnEnum) {
 	case 0x60:
 	case 0x63:
 	case 0x66:
 	case 0x67:
 		ath_reg_apply_beaconing_flags(wiphy, initiator);
 		break;
 	case 0x68:
 		ath_reg_apply_beaconing_flags(wiphy, initiator);
 		ath_reg_apply_active_scan_flags(wiphy, initiator);
 		break;
 	}
 }

 int ath_reg_notifier_apply(struct wiphy *wiphy,
 			   struct regulatory_request *request,
 			   struct ath_regulatory *reg)
 {
 	/* We always apply this */
 	ath_reg_apply_radar_flags(wiphy);

 	/*
 	 * This would happen when we have sent a custom regulatory request
 	 * a world regulatory domain and the scheduler hasn't yet processed
 	 * any pending requests in the queue.
 	 */
 	if (!request)
 		return 0;

 	switch (request->initiator) {
 	case NL80211_REGDOM_SET_BY_DRIVER:
 	case NL80211_REGDOM_SET_BY_CORE:
 	case NL80211_REGDOM_SET_BY_USER:
 		break;
 	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 		if (ath_is_world_regd(reg))
 			ath_reg_apply_world_flags(wiphy, request->initiator,
 						  reg);
 		break;
 	}

 	return 0;
 }
 EXPORT_SYMBOL(ath_reg_notifier_apply);

 static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
 {
 	u16 rd = ath_regd_get_eepromRD(reg);
 	int i;

 	if (rd & COUNTRY_ERD_FLAG) {
 		/* EEPROM value is a country code */
 		u16 cc = rd & ~COUNTRY_ERD_FLAG;
 		printk(KERN_DEBUG
 		       "ath: EEPROM indicates we should expect "
 			"a country code\n");
 		for (i = 0; i < ARRAY_SIZE(allCountries); i++)
 			if (allCountries[i].countryCode == cc)
 				return true;
 	} else {
 		/* EEPROM value is a regpair value */
 		if (rd != CTRY_DEFAULT)
 			printk(KERN_DEBUG "ath: EEPROM indicates we "
 			       "should expect a direct regpair map\n");
 		for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
 			if (regDomainPairs[i].regDmnEnum == rd)
 				return true;
 	}
 	printk(KERN_DEBUG
 		 "ath: invalid regulatory domain/country code 0x%x\n", rd);
 	return false;
 }

 /* EEPROM country code to regpair mapping */
 static struct country_code_to_enum_rd*
 ath_regd_find_country(u16 countryCode)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 		if (allCountries[i].countryCode == countryCode)
 			return &allCountries[i];
 	}
 	return NULL;
 }

 /* EEPROM rd code to regpair mapping */
 static struct country_code_to_enum_rd*
 ath_regd_find_country_by_rd(int regdmn)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 		if (allCountries[i].regDmnEnum == regdmn)
 			return &allCountries[i];
 	}
 	return NULL;
 }

 /* Returns the map of the EEPROM set RD to a country code */
 static u16 ath_regd_get_default_country(u16 rd)
 {
 	if (rd & COUNTRY_ERD_FLAG) {
 		struct country_code_to_enum_rd *country = NULL;
 		u16 cc = rd & ~COUNTRY_ERD_FLAG;

 		country = ath_regd_find_country(cc);
 		if (country != NULL)
 			return cc;
 	}

 	return CTRY_DEFAULT;
 }

 static struct reg_dmn_pair_mapping*
 ath_get_regpair(int regdmn)
 {
 	int i;

 	if (regdmn == NO_ENUMRD)
 		return NULL;
 	for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
 		if (regDomainPairs[i].regDmnEnum == regdmn)
 			return &regDomainPairs[i];
 	}
 	return NULL;
 }

 static int
 ath_regd_init_wiphy(struct ath_regulatory *reg,
 		    struct wiphy *wiphy,
 		    int (*reg_notifier)(struct wiphy *wiphy,
 					struct regulatory_request *request))
 {
 	const struct ieee80211_regdomain *regd;

 	wiphy->reg_notifier = reg_notifier;
 	wiphy->flags |= WIPHY_FLAG_STRICT_REGULATORY;

 	if (ath_is_world_regd(reg)) {
 		/*
 		 * Anything applied here (prior to wiphy registration) gets
 		 * saved on the wiphy orig_* parameters
 		 */
 		regd = ath_world_regdomain(reg);
 		wiphy->flags |= WIPHY_FLAG_CUSTOM_REGULATORY;
 	} else {
 		/*
 		 * This gets applied in the case of the absense of CRDA,
 		 * it's our own custom world regulatory domain, similar to
 		 * cfg80211's but we enable passive scanning.
 		 */
 		regd = ath_default_world_regdomain();
 	}
 	wiphy_apply_custom_regulatory(wiphy, regd);
 	ath_reg_apply_radar_flags(wiphy);
 	ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 	return 0;
 }

 /*
  * Some users have reported their EEPROM programmed with
  * 0x8000 set, this is not a supported regulatory domain
  * but since we have more than one user with it we need
  * a solution for them. We default to 0x64, which is the
  * default Atheros world regulatory domain.
  */
 static void ath_regd_sanitize(struct ath_regulatory *reg)
 {
 	if (reg->current_rd != COUNTRY_ERD_FLAG)
 		return;
 	printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
 	reg->current_rd = 0x64;
 }

 int
 ath_regd_init(struct ath_regulatory *reg,
 	      struct wiphy *wiphy,
 	      int (*reg_notifier)(struct wiphy *wiphy,
 				  struct regulatory_request *request))
 {
 	struct country_code_to_enum_rd *country = NULL;
 	u16 regdmn;

 	if (!reg)
 		return -EINVAL;

 	ath_regd_sanitize(reg);

 	printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);

 	if (!ath_regd_is_eeprom_valid(reg)) {
 		printk(KERN_ERR "ath: Invalid EEPROM contents\n");
 		return -EINVAL;
 	}

 	regdmn = ath_regd_get_eepromRD(reg);
 	reg->country_code = ath_regd_get_default_country(regdmn);

 	if (reg->country_code == CTRY_DEFAULT &&
 	    regdmn == CTRY_DEFAULT) {
 		printk(KERN_DEBUG "ath: EEPROM indicates default "
 		       "country code should be used\n");
 		reg->country_code = CTRY_UNITED_STATES;
 	}

 	if (reg->country_code == CTRY_DEFAULT) {
 		country = NULL;
 	} else {
 		printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
 		       "map search\n");
 		country = ath_regd_find_country(reg->country_code);
 		if (country == NULL) {
 			printk(KERN_DEBUG
 				"ath: no valid country maps found for "
 				"country code: 0x%0x\n",
 				reg->country_code);
 			return -EINVAL;
 		} else {
 			regdmn = country->regDmnEnum;
 			printk(KERN_DEBUG "ath: country maps to "
 			       "regdmn code: 0x%0x\n",
 			       regdmn);
 		}
 	}

 	reg->regpair = ath_get_regpair(regdmn);

 	if (!reg->regpair) {
 		printk(KERN_DEBUG "ath: "
 			"No regulatory domain pair found, cannot continue\n");
 		return -EINVAL;
 	}

 	if (!country)
 		country = ath_regd_find_country_by_rd(regdmn);

 	if (country) {
 		reg->alpha2[0] = country->isoName[0];
 		reg->alpha2[1] = country->isoName[1];
 	} else {
 		reg->alpha2[0] = '0';
 		reg->alpha2[1] = '0';
 	}

 	printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
 		reg->alpha2[0], reg->alpha2[1]);
 	printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
 		reg->regpair->regDmnEnum);

 	ath_regd_init_wiphy(reg, wiphy, reg_notifier);
 	return 0;
 }
 EXPORT_SYMBOL(ath_regd_init);

 u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
 			  enum ieee80211_band band)
 {
 	if (!reg->regpair ||
 	    (reg->country_code == CTRY_DEFAULT &&
 	     is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
 		return SD_NO_CTL;
 	}

 	switch (band) {
 	case IEEE80211_BAND_2GHZ:
 		return reg->regpair->reg_2ghz_ctl;
 	case IEEE80211_BAND_5GHZ:
 		return reg->regpair->reg_5ghz_ctl;
 	default:
 		return NO_CTL;
 	}
 }
 EXPORT_SYMBOL(ath_regd_get_band_ctl);
	/*
	* Copyright (c) 2008-2009 Atheros Communications Inc.
	*
	* Permission to use, copy, modify, and/or distribute this software for any
	* purpose with or without fee is hereby granted, provided that the above
	* copyright notice and this permission notice appear in all copies.
	*
	* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
	* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
	* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
	* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
	* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
	* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
	*/

	#include <linux/kernel.h>
	#include <net/cfg80211.h>
	#include <net/mac80211.h>
	#include "regd.h"
	#include "regd_common.h"

	/*
	* This is a set of common rules used by our world regulatory domains.
	* We have 12 world regulatory domains. To save space we consolidate
	* the regulatory domains in 5 structures by frequency and change
	* the flags on our reg_notifier() on a case by case basis.
	*/

	/* Only these channels all allow active scan on all world regulatory domains */
	#define ATH9K_2GHZ_CH01_11 REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)

	/* We enable active scan on these a case by case basis by regulatory domain */
	#define ATH9K_2GHZ_CH12_13 REG_RULE(2467-10, 2472+10, 40, 0, 20,\
	NL80211_RRF_PASSIVE_SCAN)
	#define ATH9K_2GHZ_CH14 REG_RULE(2484-10, 2484+10, 40, 0, 20,\
	NL80211_RRF_PASSIVE_SCAN \| NL80211_RRF_NO_OFDM)

	/* We allow IBSS on these on a case by case basis by regulatory domain */
	#define ATH9K_5GHZ_5150_5350 REG_RULE(5150-10, 5350+10, 40, 0, 30,\
	NL80211_RRF_PASSIVE_SCAN \| NL80211_RRF_NO_IBSS)
	#define ATH9K_5GHZ_5470_5850 REG_RULE(5470-10, 5850+10, 40, 0, 30,\
	NL80211_RRF_PASSIVE_SCAN \| NL80211_RRF_NO_IBSS)
	#define ATH9K_5GHZ_5725_5850 REG_RULE(5725-10, 5850+10, 40, 0, 30,\
	NL80211_RRF_PASSIVE_SCAN \| NL80211_RRF_NO_IBSS)

	#define ATH9K_2GHZ_ALL ATH9K_2GHZ_CH01_11, \
	ATH9K_2GHZ_CH12_13, \
	ATH9K_2GHZ_CH14

	#define ATH9K_5GHZ_ALL ATH9K_5GHZ_5150_5350, \
	ATH9K_5GHZ_5470_5850

	/* This one skips what we call "mid band" */
	#define ATH9K_5GHZ_NO_MIDBAND ATH9K_5GHZ_5150_5350, \
	ATH9K_5GHZ_5725_5850

	/* Can be used for:
	* 0x60, 0x61, 0x62 */
	static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
	.n_reg_rules = 5,
	.alpha2 = "99",
	.reg_rules = {
	ATH9K_2GHZ_ALL,
	ATH9K_5GHZ_ALL,
	}
	};

	/* Can be used by 0x63 and 0x65 */
	static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
	.n_reg_rules = 4,
	.alpha2 = "99",
	.reg_rules = {
	ATH9K_2GHZ_CH01_11,
	ATH9K_2GHZ_CH12_13,
	ATH9K_5GHZ_NO_MIDBAND,
	}
	};

	/* Can be used by 0x64 only */
	static const struct ieee80211_regdomain ath_world_regdom_64 = {
	.n_reg_rules = 3,
	.alpha2 = "99",
	.reg_rules = {
	ATH9K_2GHZ_CH01_11,
	ATH9K_5GHZ_NO_MIDBAND,
	}
	};

	/* Can be used by 0x66 and 0x69 */
	static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
	.n_reg_rules = 3,
	.alpha2 = "99",
	.reg_rules = {
	ATH9K_2GHZ_CH01_11,
	ATH9K_5GHZ_ALL,
	}
	};

	/* Can be used by 0x67, 0x6A and 0x68 */
	static const struct ieee80211_regdomain ath_world_regdom_67_68_6A = {
	.n_reg_rules = 4,
	.alpha2 = "99",
	.reg_rules = {
	ATH9K_2GHZ_CH01_11,
	ATH9K_2GHZ_CH12_13,
	ATH9K_5GHZ_ALL,
	}
	};

	static inline bool is_wwr_sku(u16 regd)
	{
	return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) &&
	(((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) \|\|
	(regd == WORLD));
	}

	static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
	{
	return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
	}

	bool ath_is_world_regd(struct ath_regulatory *reg)
	{
	return is_wwr_sku(ath_regd_get_eepromRD(reg));
	}
	EXPORT_SYMBOL(ath_is_world_regd);

	static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
	{
	/* this is the most restrictive */
	return &ath_world_regdom_64;
	}

	static const struct
	ieee80211_regdomain ath_world_regdomain(struct ath_regulatory reg)
	{
	switch (reg->regpair->regDmnEnum) {
	case 0x60:
	case 0x61:
	case 0x62:
	return &ath_world_regdom_60_61_62;
	case 0x63:
	case 0x65:
	return &ath_world_regdom_63_65;
	case 0x64:
	return &ath_world_regdom_64;
	case 0x66:
	case 0x69:
	return &ath_world_regdom_66_69;
	case 0x67:
	case 0x68:
	case 0x6A:
	return &ath_world_regdom_67_68_6A;
	default:
	WARN_ON(1);
	return ath_default_world_regdomain();
	}
	}

	/* Frequency is one where radar detection is required */
	static bool ath_is_radar_freq(u16 center_freq)
	{
	return (center_freq >= 5260 && center_freq <= 5700);
	}

	/*
	* N.B: These exception rules do not apply radar freqs.
	*
	* - We enable adhoc (or beaconing) if allowed by 11d
	* - We enable active scan if the channel is allowed by 11d
	* - If no country IE has been processed and a we determine we have
	* received a beacon on a channel we can enable active scan and
	* adhoc (or beaconing).
	*/
	static void
	ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
	enum nl80211_reg_initiator initiator)
	{
	enum ieee80211_band band;
	struct ieee80211_supported_band *sband;
	const struct ieee80211_reg_rule *reg_rule;
	struct ieee80211_channel *ch;
	unsigned int i;
	u32 bandwidth = 0;
	int r;

	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {

	if (!wiphy->bands[band])
	continue;

	sband = wiphy->bands[band];

	for (i = 0; i < sband->n_channels; i++) {

	ch = &sband->channels[i];

	if (ath_is_radar_freq(ch->center_freq) \|\|
	(ch->flags & IEEE80211_CHAN_RADAR))
	continue;

	if (initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE) {
	r = freq_reg_info(wiphy,
	ch->center_freq,
	bandwidth,
	&reg_rule);
	if (r)
	continue;
	/*
	* If 11d had a rule for this channel ensure
	* we enable adhoc/beaconing if it allows us to
	* use it. Note that we would have disabled it
	* by applying our static world regdomain by
	* default during init, prior to calling our
	* regulatory_hint().
	*/
	if (!(reg_rule->flags &
	NL80211_RRF_NO_IBSS))
	ch->flags &=
	~IEEE80211_CHAN_NO_IBSS;
	if (!(reg_rule->flags &
	NL80211_RRF_PASSIVE_SCAN))
	ch->flags &=
	~IEEE80211_CHAN_PASSIVE_SCAN;
	} else {
	if (ch->beacon_found)
	ch->flags &= ~(IEEE80211_CHAN_NO_IBSS \|
	IEEE80211_CHAN_PASSIVE_SCAN);
	}
	}
	}

	}

	/* Allows active scan scan on Ch 12 and 13 */
	static void
	ath_reg_apply_active_scan_flags(struct wiphy *wiphy,
	enum nl80211_reg_initiator initiator)
	{
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *ch;
	const struct ieee80211_reg_rule *reg_rule;
	u32 bandwidth = 0;
	int r;

	sband = wiphy->bands[IEEE80211_BAND_2GHZ];

	/*
	* If no country IE has been received always enable active scan
	* on these channels. This is only done for specific regulatory SKUs
	*/
	if (initiator != NL80211_REGDOM_SET_BY_COUNTRY_IE) {
	ch = &sband->channels[11]; /* CH 12 */
	if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
	ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
	ch = &sband->channels[12]; /* CH 13 */
	if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
	ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
	return;
	}

	/*
	* If a country IE has been recieved check its rule for this
	* channel first before enabling active scan. The passive scan
	* would have been enforced by the initial processing of our
	* custom regulatory domain.
	*/

	ch = &sband->channels[11]; /* CH 12 */
	r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
	if (!r) {
	if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
	if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
	ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
	}

	ch = &sband->channels[12]; /* CH 13 */
	r = freq_reg_info(wiphy, ch->center_freq, bandwidth, &reg_rule);
	if (!r) {
	if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
	if (ch->flags & IEEE80211_CHAN_PASSIVE_SCAN)
	ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
	}
	}

	/* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
	static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
	{
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *ch;
	unsigned int i;

	if (!wiphy->bands[IEEE80211_BAND_5GHZ])
	return;

	sband = wiphy->bands[IEEE80211_BAND_5GHZ];

	for (i = 0; i < sband->n_channels; i++) {
	ch = &sband->channels[i];
	if (!ath_is_radar_freq(ch->center_freq))
	continue;
	/* We always enable radar detection/DFS on this
	* frequency range. Additionally we also apply on
	* this frequency range:
	* - If STA mode does not yet have DFS supports disable
	* active scanning
	* - If adhoc mode does not support DFS yet then
	* disable adhoc in the frequency.
	* - If AP mode does not yet support radar detection/DFS
	* do not allow AP mode
	*/
	if (!(ch->flags & IEEE80211_CHAN_DISABLED))
	ch->flags \|= IEEE80211_CHAN_RADAR \|
	IEEE80211_CHAN_NO_IBSS \|
	IEEE80211_CHAN_PASSIVE_SCAN;
	}
	}

	static void ath_reg_apply_world_flags(struct wiphy *wiphy,
	enum nl80211_reg_initiator initiator,
	struct ath_regulatory *reg)
	{
	switch (reg->regpair->regDmnEnum) {
	case 0x60:
	case 0x63:
	case 0x66:
	case 0x67:
	ath_reg_apply_beaconing_flags(wiphy, initiator);
	break;
	case 0x68:
	ath_reg_apply_beaconing_flags(wiphy, initiator);
	ath_reg_apply_active_scan_flags(wiphy, initiator);
	break;
	}
	}

	int ath_reg_notifier_apply(struct wiphy *wiphy,
	struct regulatory_request *request,
	struct ath_regulatory *reg)
	{
	/* We always apply this */
	ath_reg_apply_radar_flags(wiphy);

	/*
	* This would happen when we have sent a custom regulatory request
	* a world regulatory domain and the scheduler hasn't yet processed
	* any pending requests in the queue.
	*/
	if (!request)
	return 0;

	switch (request->initiator) {
	case NL80211_REGDOM_SET_BY_DRIVER:
	case NL80211_REGDOM_SET_BY_CORE:
	case NL80211_REGDOM_SET_BY_USER:
	break;
	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
	if (ath_is_world_regd(reg))
	ath_reg_apply_world_flags(wiphy, request->initiator,
	reg);
	break;
	}

	return 0;
	}
	EXPORT_SYMBOL(ath_reg_notifier_apply);

	static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
	{
	u16 rd = ath_regd_get_eepromRD(reg);
	int i;

	if (rd & COUNTRY_ERD_FLAG) {
	/* EEPROM value is a country code */
	u16 cc = rd & ~COUNTRY_ERD_FLAG;
	printk(KERN_DEBUG
	"ath: EEPROM indicates we should expect "
	"a country code\n");
	for (i = 0; i < ARRAY_SIZE(allCountries); i++)
	if (allCountries[i].countryCode == cc)
	return true;
	} else {
	/* EEPROM value is a regpair value */
	if (rd != CTRY_DEFAULT)
	printk(KERN_DEBUG "ath: EEPROM indicates we "
	"should expect a direct regpair map\n");
	for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
	if (regDomainPairs[i].regDmnEnum == rd)
	return true;
	}
	printk(KERN_DEBUG
	"ath: invalid regulatory domain/country code 0x%x\n", rd);
	return false;
	}

	/* EEPROM country code to regpair mapping */
	static struct country_code_to_enum_rd*
	ath_regd_find_country(u16 countryCode)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
	if (allCountries[i].countryCode == countryCode)
	return &allCountries[i];
	}
	return NULL;
	}

	/* EEPROM rd code to regpair mapping */
	static struct country_code_to_enum_rd*
	ath_regd_find_country_by_rd(int regdmn)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
	if (allCountries[i].regDmnEnum == regdmn)
	return &allCountries[i];
	}
	return NULL;
	}

	/* Returns the map of the EEPROM set RD to a country code */
	static u16 ath_regd_get_default_country(u16 rd)
	{
	if (rd & COUNTRY_ERD_FLAG) {
	struct country_code_to_enum_rd *country = NULL;
	u16 cc = rd & ~COUNTRY_ERD_FLAG;

	country = ath_regd_find_country(cc);
	if (country != NULL)
	return cc;
	}

	return CTRY_DEFAULT;
	}

	static struct reg_dmn_pair_mapping*
	ath_get_regpair(int regdmn)
	{
	int i;

	if (regdmn == NO_ENUMRD)
	return NULL;
	for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
	if (regDomainPairs[i].regDmnEnum == regdmn)
	return &regDomainPairs[i];
	}
	return NULL;
	}

	static int
	ath_regd_init_wiphy(struct ath_regulatory *reg,
	struct wiphy *wiphy,
	int (reg_notifier)(struct wiphy wiphy,
	struct regulatory_request *request))
	{
	const struct ieee80211_regdomain *regd;

	wiphy->reg_notifier = reg_notifier;
	wiphy->flags \|= WIPHY_FLAG_STRICT_REGULATORY;

	if (ath_is_world_regd(reg)) {
	/*
	* Anything applied here (prior to wiphy registration) gets
	* saved on the wiphy orig_* parameters
	*/
	regd = ath_world_regdomain(reg);
	wiphy->flags \|= WIPHY_FLAG_CUSTOM_REGULATORY;
	} else {
	/*
	* This gets applied in the case of the absense of CRDA,
	* it's our own custom world regulatory domain, similar to
	* cfg80211's but we enable passive scanning.
	*/
	regd = ath_default_world_regdomain();
	}
	wiphy_apply_custom_regulatory(wiphy, regd);
	ath_reg_apply_radar_flags(wiphy);
	ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
	return 0;
	}

	/*
	* Some users have reported their EEPROM programmed with
	* 0x8000 set, this is not a supported regulatory domain
	* but since we have more than one user with it we need
	* a solution for them. We default to 0x64, which is the
	* default Atheros world regulatory domain.
	*/
	static void ath_regd_sanitize(struct ath_regulatory *reg)
	{
	if (reg->current_rd != COUNTRY_ERD_FLAG)
	return;
	printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
	reg->current_rd = 0x64;
	}

	int
	ath_regd_init(struct ath_regulatory *reg,
	struct wiphy *wiphy,
	int (reg_notifier)(struct wiphy wiphy,
	struct regulatory_request *request))
	{
	struct country_code_to_enum_rd *country = NULL;
	u16 regdmn;

	if (!reg)
	return -EINVAL;

	ath_regd_sanitize(reg);

	printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);

	if (!ath_regd_is_eeprom_valid(reg)) {
	printk(KERN_ERR "ath: Invalid EEPROM contents\n");
	return -EINVAL;
	}

	regdmn = ath_regd_get_eepromRD(reg);
	reg->country_code = ath_regd_get_default_country(regdmn);

	if (reg->country_code == CTRY_DEFAULT &&
	regdmn == CTRY_DEFAULT) {
	printk(KERN_DEBUG "ath: EEPROM indicates default "
	"country code should be used\n");
	reg->country_code = CTRY_UNITED_STATES;
	}

	if (reg->country_code == CTRY_DEFAULT) {
	country = NULL;
	} else {
	printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
	"map search\n");
	country = ath_regd_find_country(reg->country_code);
	if (country == NULL) {
	printk(KERN_DEBUG
	"ath: no valid country maps found for "
	"country code: 0x%0x\n",
	reg->country_code);
	return -EINVAL;
	} else {
	regdmn = country->regDmnEnum;
	printk(KERN_DEBUG "ath: country maps to "
	"regdmn code: 0x%0x\n",
	regdmn);
	}
	}

	reg->regpair = ath_get_regpair(regdmn);

	if (!reg->regpair) {
	printk(KERN_DEBUG "ath: "
	"No regulatory domain pair found, cannot continue\n");
	return -EINVAL;
	}

	if (!country)
	country = ath_regd_find_country_by_rd(regdmn);

	if (country) {
	reg->alpha2[0] = country->isoName[0];
	reg->alpha2[1] = country->isoName[1];
	} else {
	reg->alpha2[0] = '0';
	reg->alpha2[1] = '0';
	}

	printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
	reg->alpha2[0], reg->alpha2[1]);
	printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
	reg->regpair->regDmnEnum);

	ath_regd_init_wiphy(reg, wiphy, reg_notifier);
	return 0;
	}
	EXPORT_SYMBOL(ath_regd_init);

	u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
	enum ieee80211_band band)
	{
	if (!reg->regpair \|\|
	(reg->country_code == CTRY_DEFAULT &&
	is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
	return SD_NO_CTL;
	}

	switch (band) {
	case IEEE80211_BAND_2GHZ:
	return reg->regpair->reg_2ghz_ctl;
	case IEEE80211_BAND_5GHZ:
	return reg->regpair->reg_5ghz_ctl;
	default:
	return NO_CTL;
	}
	}
	EXPORT_SYMBOL(ath_regd_get_band_ctl);