/*
   * 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.
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/kernel.h>
  #include <linux/export.h>
  #include <net/cfg80211.h>
  #include <net/mac80211.h>
  #include "regd.h"
  #include "regd_common.h"
  
  static int __ath_regd_init(struct ath_regulatory *reg);
  
  /*
   * 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_NO_IR)
  #define ATH9K_2GHZ_CH14		REG_RULE(2484-10, 2484+10, 40, 0, 20,\
  					 NL80211_RRF_NO_IR | \
  					 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, 80, 0, 30,\
  					 NL80211_RRF_NO_IR)
  #define ATH9K_5GHZ_5470_5850	REG_RULE(5470-10, 5850+10, 80, 0, 30,\
  					 NL80211_RRF_NO_IR)
  #define ATH9K_5GHZ_5725_5850	REG_RULE(5725-10, 5850+10, 80, 0, 30,\
  					 NL80211_RRF_NO_IR)
  
  #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, 0x68, 0x6A and 0x6C */
  static const struct ieee80211_regdomain ath_world_regdom_67_68_6A_6C = {
  	.n_reg_rules = 4,
  	.alpha2 =  "99",
  	.reg_rules = {
  		ATH9K_2GHZ_CH01_11,
  		ATH9K_2GHZ_CH12_13,
  		ATH9K_5GHZ_ALL,
  	}
  };
  
  static bool dynamic_country_user_possible(struct ath_regulatory *reg)
  {
  	if (config_enabled(CONFIG_ATH_REG_DYNAMIC_USER_CERT_TESTING))
  		return true;
  
  	switch (reg->country_code) {
  	case CTRY_UNITED_STATES:
  	case CTRY_JAPAN1:
  	case CTRY_JAPAN2:
  	case CTRY_JAPAN3:
  	case CTRY_JAPAN4:
  	case CTRY_JAPAN5:
  	case CTRY_JAPAN6:
  	case CTRY_JAPAN7:
  	case CTRY_JAPAN8:
  	case CTRY_JAPAN9:
  	case CTRY_JAPAN10:
  	case CTRY_JAPAN11:
  	case CTRY_JAPAN12:
  	case CTRY_JAPAN13:
  	case CTRY_JAPAN14:
  	case CTRY_JAPAN15:
  	case CTRY_JAPAN16:
  	case CTRY_JAPAN17:
  	case CTRY_JAPAN18:
  	case CTRY_JAPAN19:
  	case CTRY_JAPAN20:
  	case CTRY_JAPAN21:
  	case CTRY_JAPAN22:
  	case CTRY_JAPAN23:
  	case CTRY_JAPAN24:
  	case CTRY_JAPAN25:
  	case CTRY_JAPAN26:
  	case CTRY_JAPAN27:
  	case CTRY_JAPAN28:
  	case CTRY_JAPAN29:
  	case CTRY_JAPAN30:
  	case CTRY_JAPAN31:
  	case CTRY_JAPAN32:
  	case CTRY_JAPAN33:
  	case CTRY_JAPAN34:
  	case CTRY_JAPAN35:
  	case CTRY_JAPAN36:
  	case CTRY_JAPAN37:
  	case CTRY_JAPAN38:
  	case CTRY_JAPAN39:
  	case CTRY_JAPAN40:
  	case CTRY_JAPAN41:
  	case CTRY_JAPAN42:
  	case CTRY_JAPAN43:
  	case CTRY_JAPAN44:
  	case CTRY_JAPAN45:
  	case CTRY_JAPAN46:
  	case CTRY_JAPAN47:
  	case CTRY_JAPAN48:
  	case CTRY_JAPAN49:
  	case CTRY_JAPAN50:
  	case CTRY_JAPAN51:
  	case CTRY_JAPAN52:
  	case CTRY_JAPAN53:
  	case CTRY_JAPAN54:
  	case CTRY_JAPAN55:
  	case CTRY_JAPAN56:
  	case CTRY_JAPAN57:
  	case CTRY_JAPAN58:
  	case CTRY_JAPAN59:
  		return false;
  	}
  
  	return true;
  }
  
  static bool ath_reg_dyn_country_user_allow(struct ath_regulatory *reg)
  {
  	if (!config_enabled(CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS))
  		return false;
  	if (!dynamic_country_user_possible(reg))
  		return false;
  	return true;
  }
  
  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->reg_domain) {
  	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:
  	case 0x6C:
  		return &ath_world_regdom_67_68_6A_6C;
  	default:
  		WARN_ON(1);
  		return ath_default_world_regdomain();
  	}
  }
  
  bool ath_is_49ghz_allowed(u16 regdomain)
  {
  	/* possibly more */
  	return regdomain == MKK9_MKKC;
  }
  EXPORT_SYMBOL(ath_is_49ghz_allowed);
  
  /* Frequency is one where radar detection is required */
  static bool ath_is_radar_freq(u16 center_freq)
  {
  	return (center_freq >= 5260 && center_freq <= 5700);
  }
  
  static void ath_force_clear_no_ir_chan(struct wiphy *wiphy,
  				       struct ieee80211_channel *ch)
  {
  	const struct ieee80211_reg_rule *reg_rule;
  
  	reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(ch->center_freq));
  	if (IS_ERR(reg_rule))
  		return;
  
  	if (!(reg_rule->flags & NL80211_RRF_NO_IR))
  		if (ch->flags & IEEE80211_CHAN_NO_IR)
  			ch->flags &= ~IEEE80211_CHAN_NO_IR;
  }
  
  static void ath_force_clear_no_ir_freq(struct wiphy *wiphy, u16 center_freq)
  {
  	struct ieee80211_channel *ch;
  
  	ch = ieee80211_get_channel(wiphy, center_freq);
  	if (!ch)
  		return;
  
  	ath_force_clear_no_ir_chan(wiphy, ch);
  }
  
  static void ath_force_no_ir_chan(struct ieee80211_channel *ch)
  {
  	ch->flags |= IEEE80211_CHAN_NO_IR;
  }
  
  static void ath_force_no_ir_freq(struct wiphy *wiphy, u16 center_freq)
  {
  	struct ieee80211_channel *ch;
  
  	ch = ieee80211_get_channel(wiphy, center_freq);
  	if (!ch)
  		return;
  
  	ath_force_no_ir_chan(ch);
  }
  
  static void
  __ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
  				struct ath_regulatory *reg,
  				enum nl80211_reg_initiator initiator,
  				struct ieee80211_channel *ch)
  {
  	if (ath_is_radar_freq(ch->center_freq) ||
  	    (ch->flags & IEEE80211_CHAN_RADAR))
  		return;
  
  	switch (initiator) {
  	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
  		ath_force_clear_no_ir_chan(wiphy, ch);
  		break;
  	case NL80211_REGDOM_SET_BY_USER:
  		if (ath_reg_dyn_country_user_allow(reg))
  			ath_force_clear_no_ir_chan(wiphy, ch);
  		break;
  	default:
  		if (ch->beacon_found)
  			ch->flags &= ~IEEE80211_CHAN_NO_IR;
  	}
  }
  
  /*
   * These exception rules do not apply radar frequencies.
   *
   * - We enable initiating radiation if the country IE says its fine:
   * - If no country IE has been processed and a we determine we have
   *   received a beacon on a channel we can enable initiating radiation.
   */
  static void
  ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
  			      struct ath_regulatory *reg,
  			      enum nl80211_reg_initiator initiator)
  {
  	enum ieee80211_band band;
  	struct ieee80211_supported_band *sband;
  	struct ieee80211_channel *ch;
  	unsigned int i;
  
  	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];
  			__ath_reg_apply_beaconing_flags(wiphy, reg,
  							initiator, ch);
  		}
  	}
  }
  
  /**
   * ath_reg_apply_ir_flags()
   * @wiphy: the wiphy to use
   * @initiator: the regulatory hint initiator
   *
   * If no country IE has been received always enable passive scan
   * and no-ibss on these channels. This is only done for specific
   * regulatory SKUs.
   *
   * If a country IE has been received 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.
   */
  static void
  ath_reg_apply_ir_flags(struct wiphy *wiphy,
  		       struct ath_regulatory *reg,
  		       enum nl80211_reg_initiator initiator)
  {
  	struct ieee80211_supported_band *sband;
  
  	sband = wiphy->bands[IEEE80211_BAND_2GHZ];
  	if (!sband)
  		return;
  
  	switch(initiator) {
  	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
  		ath_force_clear_no_ir_freq(wiphy, 2467);
  		ath_force_clear_no_ir_freq(wiphy, 2472);
  		break;
  	case NL80211_REGDOM_SET_BY_USER:
  		if (!ath_reg_dyn_country_user_allow(reg))
  			break;
  		ath_force_clear_no_ir_freq(wiphy, 2467);
  		ath_force_clear_no_ir_freq(wiphy, 2472);
  		break;
  	default:
  		ath_force_no_ir_freq(wiphy, 2467);
  		ath_force_no_ir_freq(wiphy, 2472);
  	}
  }
  
  /* 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_IR;
  	}
  }
  
  static void ath_reg_apply_world_flags(struct wiphy *wiphy,
  				      enum nl80211_reg_initiator initiator,
  				      struct ath_regulatory *reg)
  {
  	switch (reg->regpair->reg_domain) {
  	case 0x60:
  	case 0x63:
  	case 0x66:
  	case 0x67:
  	case 0x6C:
  		ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
  		break;
  	case 0x68:
  		ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
  		ath_reg_apply_ir_flags(wiphy, reg, initiator);
  		break;
  	default:
  		if (ath_reg_dyn_country_user_allow(reg))
  			ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
  	}
  }
  
  static u16 ath_regd_find_country_by_name(char *alpha2)
  {
  	unsigned int i;
  
  	for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
  		if (!memcmp(allCountries[i].isoName, alpha2, 2))
  			return allCountries[i].countryCode;
  	}
  
  	return -1;
  }
  
  static int __ath_reg_dyn_country(struct wiphy *wiphy,
  				 struct ath_regulatory *reg,
  				 struct regulatory_request *request)
  {
  	u16 country_code;
  
  	if (request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
  	    !ath_is_world_regd(reg))
  		return -EINVAL;
  
  	country_code = ath_regd_find_country_by_name(request->alpha2);
  	if (country_code == (u16) -1)
  		return -EINVAL;
  
  	reg->current_rd = COUNTRY_ERD_FLAG;
  	reg->current_rd |= country_code;
  
  	__ath_regd_init(reg);
  
  	ath_reg_apply_world_flags(wiphy, request->initiator, reg);
  
  	return 0;
  }
  
  static void ath_reg_dyn_country(struct wiphy *wiphy,
  				struct ath_regulatory *reg,
  				struct regulatory_request *request)
  {
  	if (__ath_reg_dyn_country(wiphy, reg, request))
  		return;
  
  	printk(KERN_DEBUG "ath: regdomain 0x%0x "
  			  "dynamically updated by %s
  ",
  	       reg->current_rd,
  	       reg_initiator_name(request->initiator));
  }
  
  void ath_reg_notifier_apply(struct wiphy *wiphy,
  			    struct regulatory_request *request,
  			    struct ath_regulatory *reg)
  {
  	struct ath_common *common = container_of(reg, struct ath_common,
  						 regulatory);
  	/* 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;
  
  	reg->region = request->dfs_region;
  	switch (request->initiator) {
  	case NL80211_REGDOM_SET_BY_CORE:
  		/*
  		 * If common->reg_world_copy is world roaming it means we *were*
  		 * world roaming... so we now have to restore that data.
  		 */
  		if (!ath_is_world_regd(&common->reg_world_copy))
  			break;
  
  		memcpy(reg, &common->reg_world_copy,
  		       sizeof(struct ath_regulatory));
  		break;
  	case NL80211_REGDOM_SET_BY_DRIVER:
  		break;
  	case NL80211_REGDOM_SET_BY_USER:
  		if (ath_reg_dyn_country_user_allow(reg))
  			ath_reg_dyn_country(wiphy, reg, request);
  		break;
  	case NL80211_REGDOM_SET_BY_COUNTRY_IE:
  		ath_reg_dyn_country(wiphy, reg, request);
  		break;
  	}
  }
  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
  ");
  		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
  ");
  		for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
  			if (regDomainPairs[i].reg_domain == rd)
  				return true;
  	}
  	printk(KERN_DEBUG
  		 "ath: invalid regulatory domain/country code 0x%x
  ", 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].reg_domain == regdmn)
  			return &regDomainPairs[i];
  	}
  	return NULL;
  }
  
  static int
  ath_regd_init_wiphy(struct ath_regulatory *reg,
  		    struct wiphy *wiphy,
  		    void (*reg_notifier)(struct wiphy *wiphy,
  					 struct regulatory_request *request))
  {
  	const struct ieee80211_regdomain *regd;
  
  	wiphy->reg_notifier = reg_notifier;
  	wiphy->regulatory_flags |= REGULATORY_STRICT_REG |
  				   REGULATORY_CUSTOM_REG;
  
  	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->regulatory_flags |= REGULATORY_COUNTRY_IE_FOLLOW_POWER;
  	} else {
  		/*
  		 * This gets applied in the case of the absence 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
  ");
  	reg->current_rd = 0x64;
  }
  
  static int __ath_regd_init(struct ath_regulatory *reg)
  {
  	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
  ", reg->current_rd);
  
  	if (!ath_regd_is_eeprom_valid(reg)) {
  		pr_err("Invalid EEPROM contents
  ");
  		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
  ");
  		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
  ");
  		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
  ",
  				reg->country_code);
  			return -EINVAL;
  		} else {
  			regdmn = country->regDmnEnum;
  			printk(KERN_DEBUG "ath: country maps to "
  			       "regdmn code: 0x%0x
  ",
  			       regdmn);
  		}
  	}
  
  	reg->regpair = ath_get_regpair(regdmn);
  
  	if (!reg->regpair) {
  		printk(KERN_DEBUG "ath: "
  			"No regulatory domain pair found, cannot continue
  ");
  		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
  ",
  		reg->alpha2[0], reg->alpha2[1]);
  	printk(KERN_DEBUG "ath: Regpair used: 0x%0x
  ",
  		reg->regpair->reg_domain);
  
  	return 0;
  }
  
  int
  ath_regd_init(struct ath_regulatory *reg,
  	      struct wiphy *wiphy,
  	      void (*reg_notifier)(struct wiphy *wiphy,
  				   struct regulatory_request *request))
  {
  	struct ath_common *common = container_of(reg, struct ath_common,
  						 regulatory);
  	int r;
  
  	r = __ath_regd_init(reg);
  	if (r)
  		return r;
  
  	if (ath_is_world_regd(reg))
  		memcpy(&common->reg_world_copy, reg,
  		       sizeof(struct ath_regulatory));
  
  	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;
  	}
  
  	if (ath_regd_get_eepromRD(reg) == CTRY_DEFAULT) {
  		switch (reg->region) {
  		case NL80211_DFS_FCC:
  			return CTL_FCC;
  		case NL80211_DFS_ETSI:
  			return CTL_ETSI;
  		case NL80211_DFS_JP:
  			return CTL_MKK;
  		default:
  			break;
  		}
  	}
  
  	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);