drivers/net/wireless/ath9k/regd.c - maze/linux - Git at Google

 /*
  * Copyright (c) 2008 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 <linux/slab.h>
 #include "ath9k.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 ath9k_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 ath9k_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 ath9k_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 ath9k_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 ath9k_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 u16 ath9k_regd_get_eepromRD(struct ath_hal *ah)
 {
 	return ah->regulatory.current_rd & ~WORLDWIDE_ROAMING_FLAG;
 }

 u16 ath9k_regd_get_rd(struct ath_hal *ah)
 {
 	return ath9k_regd_get_eepromRD(ah);
 }

 bool ath9k_is_world_regd(struct ath_hal *ah)
 {
 	return isWwrSKU(ah);
 }

 const struct ieee80211_regdomain *ath9k_default_world_regdomain(void)
 {
 	/* this is the most restrictive */
 	return &ath9k_world_regdom_64;
 }

 const struct ieee80211_regdomain *ath9k_world_regdomain(struct ath_hal *ah)
 {
 	switch (ah->regulatory.regpair->regDmnEnum) {
 	case 0x60:
 	case 0x61:
 	case 0x62:
 		return &ath9k_world_regdom_60_61_62;
 	case 0x63:
 	case 0x65:
 		return &ath9k_world_regdom_63_65;
 	case 0x64:
 		return &ath9k_world_regdom_64;
 	case 0x66:
 	case 0x69:
 		return &ath9k_world_regdom_66_69;
 	case 0x67:
 	case 0x68:
 	case 0x6A:
 		return &ath9k_world_regdom_67_68_6A;
 	default:
 		WARN_ON(1);
 		return ath9k_default_world_regdomain();
 	}
 }

 /* Frequency is one where radar detection is required */
 static bool ath9k_is_radar_freq(u16 center_freq)
 {
 	return (center_freq >= 5260 && center_freq <= 5700);
 }

 /*
  * Enable adhoc on 5 GHz if allowed by 11d.
  * Remove passive scan if channel is allowed by 11d,
  * except when on radar frequencies.
  */
 static void ath9k_reg_apply_5ghz_beaconing_flags(struct wiphy *wiphy,
 					     enum reg_set_by setby)
 {
 	struct ieee80211_supported_band *sband;
 	const struct ieee80211_reg_rule *reg_rule;
 	struct ieee80211_channel *ch;
 	unsigned int i;
 	u32 bandwidth = 0;
 	int r;

 	if (setby != REGDOM_SET_BY_COUNTRY_IE)
 		return;
 	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];
 		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
 		 * if it allows us to use it. Note that we would have disabled
 		 * it by applying our static world regdomain by default during
 		 * probe */
 		if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
 			ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
 		if (!ath9k_is_radar_freq(ch->center_freq))
 			continue;
 		if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
 			ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
 	}
 }

 /* Allows active scan scan on Ch 12 and 13 */
 static void ath9k_reg_apply_active_scan_flags(struct wiphy *wiphy,
 					      enum reg_set_by setby)
 {
 	struct ieee80211_supported_band *sband;
 	struct ieee80211_channel *ch;
 	const struct ieee80211_reg_rule *reg_rule;
 	u32 bandwidth = 0;
 	int r;

 	/* Force passive scan on Channels 12-13 */
 	sband = wiphy->bands[IEEE80211_BAND_2GHZ];

 	/* If no country IE has been received always enable active scan
 	 * on these channels */
 	if (setby != 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 probe processing on
 	 * 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 */
 void ath9k_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 (!ath9k_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;
 	}
 }

 void ath9k_reg_apply_world_flags(struct wiphy *wiphy, enum reg_set_by setby)
 {
 	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 	struct ath_softc *sc = hw->priv;
 	struct ath_hal *ah = sc->sc_ah;

 	switch (ah->regulatory.regpair->regDmnEnum) {
 	case 0x60:
 	case 0x63:
 	case 0x66:
 	case 0x67:
 		ath9k_reg_apply_5ghz_beaconing_flags(wiphy, setby);
 		break;
 	case 0x68:
 		ath9k_reg_apply_5ghz_beaconing_flags(wiphy, setby);
 		ath9k_reg_apply_active_scan_flags(wiphy, setby);
 		break;
 	}
 	return;
 }

 int ath9k_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 {
 	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 	struct ath_softc *sc = hw->priv;

 	/* We always apply this */
 	ath9k_reg_apply_radar_flags(wiphy);

 	switch (request->initiator) {
 	case REGDOM_SET_BY_DRIVER:
 	case REGDOM_SET_BY_INIT:
 	case REGDOM_SET_BY_CORE:
 	case REGDOM_SET_BY_USER:
 		break;
 	case REGDOM_SET_BY_COUNTRY_IE:
 		if (ath9k_is_world_regd(sc->sc_ah))
 			ath9k_reg_apply_world_flags(wiphy, request->initiator);
 		break;
 	}

 	return 0;
 }

 bool ath9k_regd_is_eeprom_valid(struct ath_hal *ah)
 {
 	u16 rd = ath9k_regd_get_eepromRD(ah);
 	int i;

 	if (rd & COUNTRY_ERD_FLAG) {
 		/* EEPROM value is a country code */
 		u16 cc = rd & ~COUNTRY_ERD_FLAG;
 		for (i = 0; i < ARRAY_SIZE(allCountries); i++)
 			if (allCountries[i].countryCode == cc)
 				return true;
 	} else {
 		/* EEPROM value is a regpair value */
 		for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
 			if (regDomainPairs[i].regDmnEnum == rd)
 				return true;
 	}
 	DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
 		 "invalid regulatory domain/country code 0x%x\n", rd);
 	return false;
 }

 /* EEPROM country code to regpair mapping */
 static struct country_code_to_enum_rd*
 ath9k_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*
 ath9k_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 ath9k_regd_get_default_country(struct ath_hal *ah)
 {
 	u16 rd;

 	rd = ath9k_regd_get_eepromRD(ah);
 	if (rd & COUNTRY_ERD_FLAG) {
 		struct country_code_to_enum_rd *country = NULL;
 		u16 cc = rd & ~COUNTRY_ERD_FLAG;

 		country = ath9k_regd_find_country(cc);
 		if (country != NULL)
 			return cc;
 	}

 	return CTRY_DEFAULT;
 }

 static struct reg_dmn_pair_mapping*
 ath9k_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;
 }

 int ath9k_regd_init(struct ath_hal *ah)
 {
 	struct country_code_to_enum_rd *country = NULL;
 	int regdmn;

 	if (!ath9k_regd_is_eeprom_valid(ah)) {
 		DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
 			"Invalid EEPROM contents\n");
 		return -EINVAL;
 	}

 	ah->regulatory.country_code = ath9k_regd_get_default_country(ah);

 	if (ah->regulatory.country_code == CTRY_DEFAULT &&
 	    ath9k_regd_get_eepromRD(ah) == CTRY_DEFAULT)
 		ah->regulatory.country_code = CTRY_UNITED_STATES;

 	if (ah->regulatory.country_code == CTRY_DEFAULT) {
 		regdmn = ath9k_regd_get_eepromRD(ah);
 		country = NULL;
 	} else {
 		country = ath9k_regd_find_country(ah->regulatory.country_code);
 		if (country == NULL) {
 			DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
 				"Country is NULL!!!!, cc= %d\n",
 				ah->regulatory.country_code);
 			return -EINVAL;
 		} else
 			regdmn = country->regDmnEnum;
 	}

 	ah->regulatory.current_rd_inuse = regdmn;
 	ah->regulatory.regpair = ath9k_get_regpair(regdmn);

 	if (!ah->regulatory.regpair) {
 		DPRINTF(ah->ah_sc, ATH_DBG_FATAL,
 			"No regulatory domain pair found, cannot continue\n");
 		return -EINVAL;
 	}

 	if (!country)
 		country = ath9k_regd_find_country_by_rd(regdmn);

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

 	DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
 		"Country alpha2 being used: %c%c\n"
 		"Regulatory.Regpair detected: 0x%0x\n",
 		ah->regulatory.alpha2[0], ah->regulatory.alpha2[1],
 		ah->regulatory.regpair->regDmnEnum);

 	return 0;
 }

 u32 ath9k_regd_get_ctl(struct ath_hal *ah, struct ath9k_channel *chan)
 {
 	u32 ctl = NO_CTL;

 	if (!ah->regulatory.regpair ||
 	    (ah->regulatory.country_code == CTRY_DEFAULT && isWwrSKU(ah))) {
 		if (IS_CHAN_B(chan))
 			ctl = SD_NO_CTL | CTL_11B;
 		else if (IS_CHAN_G(chan))
 			ctl = SD_NO_CTL | CTL_11G;
 		else
 			ctl = SD_NO_CTL | CTL_11A;
 		return ctl;
 	}

 	if (IS_CHAN_B(chan))
 		ctl = ah->regulatory.regpair->reg_2ghz_ctl | CTL_11B;
 	else if (IS_CHAN_G(chan))
 		ctl = ah->regulatory.regpair->reg_5ghz_ctl | CTL_11G;
 	else
 		ctl = ah->regulatory.regpair->reg_5ghz_ctl | CTL_11A;

 	return ctl;
 }
	/*
	* Copyright (c) 2008 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 <linux/slab.h>
	#include "ath9k.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 ath9k_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 ath9k_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 ath9k_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 ath9k_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 ath9k_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 u16 ath9k_regd_get_eepromRD(struct ath_hal *ah)
	{
	return ah->regulatory.current_rd & ~WORLDWIDE_ROAMING_FLAG;
	}

	u16 ath9k_regd_get_rd(struct ath_hal *ah)
	{
	return ath9k_regd_get_eepromRD(ah);
	}

	bool ath9k_is_world_regd(struct ath_hal *ah)
	{
	return isWwrSKU(ah);
	}

	const struct ieee80211_regdomain *ath9k_default_world_regdomain(void)
	{
	/* this is the most restrictive */
	return &ath9k_world_regdom_64;
	}

	const struct ieee80211_regdomain ath9k_world_regdomain(struct ath_hal ah)
	{
	switch (ah->regulatory.regpair->regDmnEnum) {
	case 0x60:
	case 0x61:
	case 0x62:
	return &ath9k_world_regdom_60_61_62;
	case 0x63:
	case 0x65:
	return &ath9k_world_regdom_63_65;
	case 0x64:
	return &ath9k_world_regdom_64;
	case 0x66:
	case 0x69:
	return &ath9k_world_regdom_66_69;
	case 0x67:
	case 0x68:
	case 0x6A:
	return &ath9k_world_regdom_67_68_6A;
	default:
	WARN_ON(1);
	return ath9k_default_world_regdomain();
	}
	}

	/* Frequency is one where radar detection is required */
	static bool ath9k_is_radar_freq(u16 center_freq)
	{
	return (center_freq >= 5260 && center_freq <= 5700);
	}

	/*
	* Enable adhoc on 5 GHz if allowed by 11d.
	* Remove passive scan if channel is allowed by 11d,
	* except when on radar frequencies.
	*/
	static void ath9k_reg_apply_5ghz_beaconing_flags(struct wiphy *wiphy,
	enum reg_set_by setby)
	{
	struct ieee80211_supported_band *sband;
	const struct ieee80211_reg_rule *reg_rule;
	struct ieee80211_channel *ch;
	unsigned int i;
	u32 bandwidth = 0;
	int r;

	if (setby != REGDOM_SET_BY_COUNTRY_IE)
	return;
	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];
	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
	* if it allows us to use it. Note that we would have disabled
	* it by applying our static world regdomain by default during
	* probe */
	if (!(reg_rule->flags & NL80211_RRF_NO_IBSS))
	ch->flags &= ~IEEE80211_CHAN_NO_IBSS;
	if (!ath9k_is_radar_freq(ch->center_freq))
	continue;
	if (!(reg_rule->flags & NL80211_RRF_PASSIVE_SCAN))
	ch->flags &= ~IEEE80211_CHAN_PASSIVE_SCAN;
	}
	}

	/* Allows active scan scan on Ch 12 and 13 */
	static void ath9k_reg_apply_active_scan_flags(struct wiphy *wiphy,
	enum reg_set_by setby)
	{
	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *ch;
	const struct ieee80211_reg_rule *reg_rule;
	u32 bandwidth = 0;
	int r;

	/* Force passive scan on Channels 12-13 */
	sband = wiphy->bands[IEEE80211_BAND_2GHZ];

	/* If no country IE has been received always enable active scan
	* on these channels */
	if (setby != 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 probe processing on
	* 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 */
	void ath9k_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 (!ath9k_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;
	}
	}

	void ath9k_reg_apply_world_flags(struct wiphy *wiphy, enum reg_set_by setby)
	{
	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
	struct ath_softc *sc = hw->priv;
	struct ath_hal *ah = sc->sc_ah;

	switch (ah->regulatory.regpair->regDmnEnum) {
	case 0x60:
	case 0x63:
	case 0x66:
	case 0x67:
	ath9k_reg_apply_5ghz_beaconing_flags(wiphy, setby);
	break;
	case 0x68:
	ath9k_reg_apply_5ghz_beaconing_flags(wiphy, setby);
	ath9k_reg_apply_active_scan_flags(wiphy, setby);
	break;
	}
	return;
	}

	int ath9k_reg_notifier(struct wiphy wiphy, struct regulatory_request request)
	{
	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
	struct ath_softc *sc = hw->priv;

	/* We always apply this */
	ath9k_reg_apply_radar_flags(wiphy);

	switch (request->initiator) {
	case REGDOM_SET_BY_DRIVER:
	case REGDOM_SET_BY_INIT:
	case REGDOM_SET_BY_CORE:
	case REGDOM_SET_BY_USER:
	break;
	case REGDOM_SET_BY_COUNTRY_IE:
	if (ath9k_is_world_regd(sc->sc_ah))
	ath9k_reg_apply_world_flags(wiphy, request->initiator);
	break;
	}

	return 0;
	}

	bool ath9k_regd_is_eeprom_valid(struct ath_hal *ah)
	{
	u16 rd = ath9k_regd_get_eepromRD(ah);
	int i;

	if (rd & COUNTRY_ERD_FLAG) {
	/* EEPROM value is a country code */
	u16 cc = rd & ~COUNTRY_ERD_FLAG;
	for (i = 0; i < ARRAY_SIZE(allCountries); i++)
	if (allCountries[i].countryCode == cc)
	return true;
	} else {
	/* EEPROM value is a regpair value */
	for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
	if (regDomainPairs[i].regDmnEnum == rd)
	return true;
	}
	DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
	"invalid regulatory domain/country code 0x%x\n", rd);
	return false;
	}

	/* EEPROM country code to regpair mapping */
	static struct country_code_to_enum_rd*
	ath9k_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*
	ath9k_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 ath9k_regd_get_default_country(struct ath_hal *ah)
	{
	u16 rd;

	rd = ath9k_regd_get_eepromRD(ah);
	if (rd & COUNTRY_ERD_FLAG) {
	struct country_code_to_enum_rd *country = NULL;
	u16 cc = rd & ~COUNTRY_ERD_FLAG;

	country = ath9k_regd_find_country(cc);
	if (country != NULL)
	return cc;
	}

	return CTRY_DEFAULT;
	}

	static struct reg_dmn_pair_mapping*
	ath9k_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;
	}

	int ath9k_regd_init(struct ath_hal *ah)
	{
	struct country_code_to_enum_rd *country = NULL;
	int regdmn;

	if (!ath9k_regd_is_eeprom_valid(ah)) {
	DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
	"Invalid EEPROM contents\n");
	return -EINVAL;
	}

	ah->regulatory.country_code = ath9k_regd_get_default_country(ah);

	if (ah->regulatory.country_code == CTRY_DEFAULT &&
	ath9k_regd_get_eepromRD(ah) == CTRY_DEFAULT)
	ah->regulatory.country_code = CTRY_UNITED_STATES;

	if (ah->regulatory.country_code == CTRY_DEFAULT) {
	regdmn = ath9k_regd_get_eepromRD(ah);
	country = NULL;
	} else {
	country = ath9k_regd_find_country(ah->regulatory.country_code);
	if (country == NULL) {
	DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
	"Country is NULL!!!!, cc= %d\n",
	ah->regulatory.country_code);
	return -EINVAL;
	} else
	regdmn = country->regDmnEnum;
	}

	ah->regulatory.current_rd_inuse = regdmn;
	ah->regulatory.regpair = ath9k_get_regpair(regdmn);

	if (!ah->regulatory.regpair) {
	DPRINTF(ah->ah_sc, ATH_DBG_FATAL,
	"No regulatory domain pair found, cannot continue\n");
	return -EINVAL;
	}

	if (!country)
	country = ath9k_regd_find_country_by_rd(regdmn);

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

	DPRINTF(ah->ah_sc, ATH_DBG_REGULATORY,
	"Country alpha2 being used: %c%c\n"
	"Regulatory.Regpair detected: 0x%0x\n",
	ah->regulatory.alpha2[0], ah->regulatory.alpha2[1],
	ah->regulatory.regpair->regDmnEnum);

	return 0;
	}

	u32 ath9k_regd_get_ctl(struct ath_hal ah, struct ath9k_channel chan)
	{
	u32 ctl = NO_CTL;

	if (!ah->regulatory.regpair \|\|
	(ah->regulatory.country_code == CTRY_DEFAULT && isWwrSKU(ah))) {
	if (IS_CHAN_B(chan))
	ctl = SD_NO_CTL \| CTL_11B;
	else if (IS_CHAN_G(chan))
	ctl = SD_NO_CTL \| CTL_11G;
	else
	ctl = SD_NO_CTL \| CTL_11A;
	return ctl;
	}

	if (IS_CHAN_B(chan))
	ctl = ah->regulatory.regpair->reg_2ghz_ctl \| CTL_11B;
	else if (IS_CHAN_G(chan))
	ctl = ah->regulatory.regpair->reg_5ghz_ctl \| CTL_11G;
	else
	ctl = ah->regulatory.regpair->reg_5ghz_ctl \| CTL_11A;

	return ctl;
	}