drivers/net/wireless/ath/ath11k/reg.c - linux/kernel/git/torvalds/linux - Git at Google

 // SPDX-License-Identifier: BSD-3-Clause-Clear
 /*
  * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
  */
 #include <linux/rtnetlink.h>

 #include "core.h"
 #include "debug.h"

 /* World regdom to be used in case default regd from fw is unavailable */
 #define ATH11K_2GHZ_CH01_11      REG_RULE(2412 - 10, 2462 + 10, 40, 0, 20, 0)
 #define ATH11K_5GHZ_5150_5350    REG_RULE(5150 - 10, 5350 + 10, 80, 0, 30,\
 					  NL80211_RRF_NO_IR)
 #define ATH11K_5GHZ_5725_5850    REG_RULE(5725 - 10, 5850 + 10, 80, 0, 30,\
 					  NL80211_RRF_NO_IR)

 #define ETSI_WEATHER_RADAR_BAND_LOW		5590
 #define ETSI_WEATHER_RADAR_BAND_HIGH		5650
 #define ETSI_WEATHER_RADAR_BAND_CAC_TIMEOUT	600000

 static const struct ieee80211_regdomain ath11k_world_regd = {
 	.n_reg_rules = 3,
 	.alpha2 =  "00",
 	.reg_rules = {
 		ATH11K_2GHZ_CH01_11,
 		ATH11K_5GHZ_5150_5350,
 		ATH11K_5GHZ_5725_5850,
 	}
 };

 static bool ath11k_regdom_changes(struct ath11k *ar, char *alpha2)
 {
 	const struct ieee80211_regdomain *regd;

 	regd = rcu_dereference_rtnl(ar->hw->wiphy->regd);
 	/* This can happen during wiphy registration where the previous
 	 * user request is received before we update the regd received
 	 * from firmware.
 	 */
 	if (!regd)
 		return true;

 	return memcmp(regd->alpha2, alpha2, 2) != 0;
 }

 static void
 ath11k_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
 {
 	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
 	struct wmi_init_country_params init_country_param;
 	struct wmi_set_current_country_params set_current_param = {};
 	struct ath11k *ar = hw->priv;
 	int ret;

 	ath11k_dbg(ar->ab, ATH11K_DBG_REG,
 		   "Regulatory Notification received for %s\n", wiphy_name(wiphy));

 	/* Currently supporting only General User Hints. Cell base user
 	 * hints to be handled later.
 	 * Hints from other sources like Core, Beacons are not expected for
 	 * self managed wiphy's
 	 */
 	if (!(request->initiator == NL80211_REGDOM_SET_BY_USER &&
 	      request->user_reg_hint_type == NL80211_USER_REG_HINT_USER)) {
 		ath11k_warn(ar->ab, "Unexpected Regulatory event for this wiphy\n");
 		return;
 	}

 	if (!IS_ENABLED(CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS)) {
 		ath11k_dbg(ar->ab, ATH11K_DBG_REG,
 			   "Country Setting is not allowed\n");
 		return;
 	}

 	if (!ath11k_regdom_changes(ar, request->alpha2)) {
 		ath11k_dbg(ar->ab, ATH11K_DBG_REG, "Country is already set\n");
 		return;
 	}

 	/* Set the country code to the firmware and will receive
 	 * the WMI_REG_CHAN_LIST_CC EVENT for updating the
 	 * reg info
 	 */
 	if (ar->ab->hw_params.current_cc_support) {
 		memcpy(&set_current_param.alpha2, request->alpha2, 2);
 		memcpy(&ar->alpha2, &set_current_param.alpha2, 2);
 		ret = ath11k_wmi_send_set_current_country_cmd(ar, &set_current_param);
 		if (ret)
 			ath11k_warn(ar->ab,
 				    "failed set current country code: %d\n", ret);
 	} else {
 		init_country_param.flags = ALPHA_IS_SET;
 		memcpy(&init_country_param.cc_info.alpha2, request->alpha2, 2);
 		init_country_param.cc_info.alpha2[2] = 0;

 		ret = ath11k_wmi_send_init_country_cmd(ar, init_country_param);
 		if (ret)
 			ath11k_warn(ar->ab,
 				    "INIT Country code set to fw failed : %d\n", ret);
 	}

 	ath11k_mac_11d_scan_stop(ar);
 	ar->regdom_set_by_user = true;
 }

 int ath11k_reg_update_chan_list(struct ath11k *ar, bool wait)
 {
 	struct ieee80211_supported_band **bands;
 	struct scan_chan_list_params *params;
 	struct ieee80211_channel *channel;
 	struct ieee80211_hw *hw = ar->hw;
 	struct channel_param *ch;
 	enum nl80211_band band;
 	int num_channels = 0;
 	int i, ret, left;

 	if (wait && ar->state_11d != ATH11K_11D_IDLE) {
 		left = wait_for_completion_timeout(&ar->completed_11d_scan,
 						   ATH11K_SCAN_TIMEOUT_HZ);
 		if (!left) {
 			ath11k_dbg(ar->ab, ATH11K_DBG_REG,
 				   "failed to receive 11d scan complete: timed out\n");
 			ar->state_11d = ATH11K_11D_IDLE;
 		}
 		ath11k_dbg(ar->ab, ATH11K_DBG_REG,
 			   "reg 11d scan wait left time %d\n", left);
 	}

 	if (wait &&
 	    (ar->scan.state == ATH11K_SCAN_STARTING ||
 	    ar->scan.state == ATH11K_SCAN_RUNNING)) {
 		left = wait_for_completion_timeout(&ar->scan.completed,
 						   ATH11K_SCAN_TIMEOUT_HZ);
 		if (!left)
 			ath11k_dbg(ar->ab, ATH11K_DBG_REG,
 				   "failed to receive hw scan complete: timed out\n");

 		ath11k_dbg(ar->ab, ATH11K_DBG_REG,
 			   "reg hw scan wait left time %d\n", left);
 	}

 	if (ar->state == ATH11K_STATE_RESTARTING)
 		return 0;

 	bands = hw->wiphy->bands;
 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
 		if (!bands[band])
 			continue;

 		for (i = 0; i < bands[band]->n_channels; i++) {
 			if (bands[band]->channels[i].flags &
 			    IEEE80211_CHAN_DISABLED)
 				continue;

 			num_channels++;
 		}
 	}

 	if (WARN_ON(!num_channels))
 		return -EINVAL;

 	params = kzalloc(struct_size(params, ch_param, num_channels),
 			 GFP_KERNEL);
 	if (!params)
 		return -ENOMEM;

 	params->pdev_id = ar->pdev->pdev_id;
 	params->nallchans = num_channels;

 	ch = params->ch_param;

 	for (band = 0; band < NUM_NL80211_BANDS; band++) {
 		if (!bands[band])
 			continue;

 		for (i = 0; i < bands[band]->n_channels; i++) {
 			channel = &bands[band]->channels[i];

 			if (channel->flags & IEEE80211_CHAN_DISABLED)
 				continue;

 			/* TODO: Set to true/false based on some condition? */
 			ch->allow_ht = true;
 			ch->allow_vht = true;
 			ch->allow_he = true;

 			ch->dfs_set =
 				!!(channel->flags & IEEE80211_CHAN_RADAR);
 			ch->is_chan_passive = !!(channel->flags &
 						IEEE80211_CHAN_NO_IR);
 			ch->is_chan_passive |= ch->dfs_set;
 			ch->mhz = channel->center_freq;
 			ch->cfreq1 = channel->center_freq;
 			ch->minpower = 0;
 			ch->maxpower = channel->max_power * 2;
 			ch->maxregpower = channel->max_reg_power * 2;
 			ch->antennamax = channel->max_antenna_gain * 2;

 			/* TODO: Use appropriate phymodes */
 			if (channel->band == NL80211_BAND_2GHZ)
 				ch->phy_mode = MODE_11G;
 			else
 				ch->phy_mode = MODE_11A;

 			if (channel->band == NL80211_BAND_6GHZ &&
 			    cfg80211_channel_is_psc(channel))
 				ch->psc_channel = true;

 			ath11k_dbg(ar->ab, ATH11K_DBG_WMI,
 				   "mac channel [%d/%d] freq %d maxpower %d regpower %d antenna %d mode %d\n",
 				   i, params->nallchans,
 				   ch->mhz, ch->maxpower, ch->maxregpower,
 				   ch->antennamax, ch->phy_mode);

 			ch++;
 			/* TODO: use quarrter/half rate, cfreq12, dfs_cfreq2
 			 * set_agile, reg_class_idx
 			 */
 		}
 	}

 	ret = ath11k_wmi_send_scan_chan_list_cmd(ar, params);
 	kfree(params);

 	return ret;
 }

 static void ath11k_copy_regd(struct ieee80211_regdomain *regd_orig,
 			     struct ieee80211_regdomain *regd_copy)
 {
 	u8 i;

 	/* The caller should have checked error conditions */
 	memcpy(regd_copy, regd_orig, sizeof(*regd_orig));

 	for (i = 0; i < regd_orig->n_reg_rules; i++)
 		memcpy(&regd_copy->reg_rules[i], &regd_orig->reg_rules[i],
 		       sizeof(struct ieee80211_reg_rule));
 }

 int ath11k_regd_update(struct ath11k *ar)
 {
 	struct ieee80211_regdomain *regd, *regd_copy = NULL;
 	int ret, regd_len, pdev_id;
 	struct ath11k_base *ab;

 	ab = ar->ab;
 	pdev_id = ar->pdev_idx;

 	spin_lock_bh(&ab->base_lock);

 	/* Prefer the latest regd update over default if it's available */
 	if (ab->new_regd[pdev_id]) {
 		regd = ab->new_regd[pdev_id];
 	} else {
 		/* Apply the regd received during init through
 		 * WMI_REG_CHAN_LIST_CC event. In case of failure to
 		 * receive the regd, initialize with a default world
 		 * regulatory.
 		 */
 		if (ab->default_regd[pdev_id]) {
 			regd = ab->default_regd[pdev_id];
 		} else {
 			ath11k_warn(ab,
 				    "failed to receive default regd during init\n");
 			regd = (struct ieee80211_regdomain *)&ath11k_world_regd;
 		}
 	}

 	if (!regd) {
 		ret = -EINVAL;
 		spin_unlock_bh(&ab->base_lock);
 		goto err;
 	}

 	regd_len = sizeof(*regd) + (regd->n_reg_rules *
 		sizeof(struct ieee80211_reg_rule));

 	regd_copy = kzalloc(regd_len, GFP_ATOMIC);
 	if (regd_copy)
 		ath11k_copy_regd(regd, regd_copy);

 	spin_unlock_bh(&ab->base_lock);

 	if (!regd_copy) {
 		ret = -ENOMEM;
 		goto err;
 	}

 	rtnl_lock();
 	wiphy_lock(ar->hw->wiphy);
 	ret = regulatory_set_wiphy_regd_sync(ar->hw->wiphy, regd_copy);
 	wiphy_unlock(ar->hw->wiphy);
 	rtnl_unlock();

 	kfree(regd_copy);

 	if (ret)
 		goto err;

 	if (ar->state == ATH11K_STATE_ON) {
 		ret = ath11k_reg_update_chan_list(ar, true);
 		if (ret)
 			goto err;
 	}

 	return 0;
 err:
 	ath11k_warn(ab, "failed to perform regd update : %d\n", ret);
 	return ret;
 }

 static enum nl80211_dfs_regions
 ath11k_map_fw_dfs_region(enum ath11k_dfs_region dfs_region)
 {
 	switch (dfs_region) {
 	case ATH11K_DFS_REG_FCC:
 	case ATH11K_DFS_REG_CN:
 		return NL80211_DFS_FCC;
 	case ATH11K_DFS_REG_ETSI:
 	case ATH11K_DFS_REG_KR:
 		return NL80211_DFS_ETSI;
 	case ATH11K_DFS_REG_MKK:
 	case ATH11K_DFS_REG_MKK_N:
 		return NL80211_DFS_JP;
 	default:
 		return NL80211_DFS_UNSET;
 	}
 }

 static u32 ath11k_map_fw_reg_flags(u16 reg_flags)
 {
 	u32 flags = 0;

 	if (reg_flags & REGULATORY_CHAN_NO_IR)
 		flags = NL80211_RRF_NO_IR;

 	if (reg_flags & REGULATORY_CHAN_RADAR)
 		flags |= NL80211_RRF_DFS;

 	if (reg_flags & REGULATORY_CHAN_NO_OFDM)
 		flags |= NL80211_RRF_NO_OFDM;

 	if (reg_flags & REGULATORY_CHAN_INDOOR_ONLY)
 		flags |= NL80211_RRF_NO_OUTDOOR;

 	if (reg_flags & REGULATORY_CHAN_NO_HT40)
 		flags |= NL80211_RRF_NO_HT40;

 	if (reg_flags & REGULATORY_CHAN_NO_80MHZ)
 		flags |= NL80211_RRF_NO_80MHZ;

 	if (reg_flags & REGULATORY_CHAN_NO_160MHZ)
 		flags |= NL80211_RRF_NO_160MHZ;

 	return flags;
 }

 static bool
 ath11k_reg_can_intersect(struct ieee80211_reg_rule *rule1,
 			 struct ieee80211_reg_rule *rule2)
 {
 	u32 start_freq1, end_freq1;
 	u32 start_freq2, end_freq2;

 	start_freq1 = rule1->freq_range.start_freq_khz;
 	start_freq2 = rule2->freq_range.start_freq_khz;

 	end_freq1 = rule1->freq_range.end_freq_khz;
 	end_freq2 = rule2->freq_range.end_freq_khz;

 	if ((start_freq1 >= start_freq2 &&
 	     start_freq1 < end_freq2) ||
 	    (start_freq2 > start_freq1 &&
 	     start_freq2 < end_freq1))
 		return true;

 	/* TODO: Should we restrict intersection feasibility
 	 *  based on min bandwidth of the intersected region also,
 	 *  say the intersected rule should have a  min bandwidth
 	 * of 20MHz?
 	 */

 	return false;
 }

 static void ath11k_reg_intersect_rules(struct ieee80211_reg_rule *rule1,
 				       struct ieee80211_reg_rule *rule2,
 				       struct ieee80211_reg_rule *new_rule)
 {
 	u32 start_freq1, end_freq1;
 	u32 start_freq2, end_freq2;
 	u32 freq_diff, max_bw;

 	start_freq1 = rule1->freq_range.start_freq_khz;
 	start_freq2 = rule2->freq_range.start_freq_khz;

 	end_freq1 = rule1->freq_range.end_freq_khz;
 	end_freq2 = rule2->freq_range.end_freq_khz;

 	new_rule->freq_range.start_freq_khz = max_t(u32, start_freq1,
 						    start_freq2);
 	new_rule->freq_range.end_freq_khz = min_t(u32, end_freq1, end_freq2);

 	freq_diff = new_rule->freq_range.end_freq_khz -
 			new_rule->freq_range.start_freq_khz;
 	max_bw = min_t(u32, rule1->freq_range.max_bandwidth_khz,
 		       rule2->freq_range.max_bandwidth_khz);
 	new_rule->freq_range.max_bandwidth_khz = min_t(u32, max_bw, freq_diff);

 	new_rule->power_rule.max_antenna_gain =
 		min_t(u32, rule1->power_rule.max_antenna_gain,
 		      rule2->power_rule.max_antenna_gain);

 	new_rule->power_rule.max_eirp = min_t(u32, rule1->power_rule.max_eirp,
 					      rule2->power_rule.max_eirp);

 	/* Use the flags of both the rules */
 	new_rule->flags = rule1->flags | rule2->flags;

 	/* To be safe, lts use the max cac timeout of both rules */
 	new_rule->dfs_cac_ms = max_t(u32, rule1->dfs_cac_ms,
 				     rule2->dfs_cac_ms);
 }

 static struct ieee80211_regdomain *
 ath11k_regd_intersect(struct ieee80211_regdomain *default_regd,
 		      struct ieee80211_regdomain *curr_regd)
 {
 	u8 num_old_regd_rules, num_curr_regd_rules, num_new_regd_rules;
 	struct ieee80211_reg_rule *old_rule, *curr_rule, *new_rule;
 	struct ieee80211_regdomain *new_regd = NULL;
 	u8 i, j, k;

 	num_old_regd_rules = default_regd->n_reg_rules;
 	num_curr_regd_rules = curr_regd->n_reg_rules;
 	num_new_regd_rules = 0;

 	/* Find the number of intersecting rules to allocate new regd memory */
 	for (i = 0; i < num_old_regd_rules; i++) {
 		old_rule = default_regd->reg_rules + i;
 		for (j = 0; j < num_curr_regd_rules; j++) {
 			curr_rule = curr_regd->reg_rules + j;

 			if (ath11k_reg_can_intersect(old_rule, curr_rule))
 				num_new_regd_rules++;
 		}
 	}

 	if (!num_new_regd_rules)
 		return NULL;

 	new_regd = kzalloc(sizeof(*new_regd) + (num_new_regd_rules *
 			sizeof(struct ieee80211_reg_rule)),
 			GFP_ATOMIC);

 	if (!new_regd)
 		return NULL;

 	/* We set the new country and dfs region directly and only trim
 	 * the freq, power, antenna gain by intersecting with the
 	 * default regdomain. Also MAX of the dfs cac timeout is selected.
 	 */
 	new_regd->n_reg_rules = num_new_regd_rules;
 	memcpy(new_regd->alpha2, curr_regd->alpha2, sizeof(new_regd->alpha2));
 	new_regd->dfs_region = curr_regd->dfs_region;
 	new_rule = new_regd->reg_rules;

 	for (i = 0, k = 0; i < num_old_regd_rules; i++) {
 		old_rule = default_regd->reg_rules + i;
 		for (j = 0; j < num_curr_regd_rules; j++) {
 			curr_rule = curr_regd->reg_rules + j;

 			if (ath11k_reg_can_intersect(old_rule, curr_rule))
 				ath11k_reg_intersect_rules(old_rule, curr_rule,
 							   (new_rule + k++));
 		}
 	}
 	return new_regd;
 }

 static const char *
 ath11k_reg_get_regdom_str(enum nl80211_dfs_regions dfs_region)
 {
 	switch (dfs_region) {
 	case NL80211_DFS_FCC:
 		return "FCC";
 	case NL80211_DFS_ETSI:
 		return "ETSI";
 	case NL80211_DFS_JP:
 		return "JP";
 	default:
 		return "UNSET";
 	}
 }

 static u16
 ath11k_reg_adjust_bw(u16 start_freq, u16 end_freq, u16 max_bw)
 {
 	u16 bw;

 	if (end_freq <= start_freq)
 		return 0;

 	bw = end_freq - start_freq;
 	bw = min_t(u16, bw, max_bw);

 	if (bw >= 80 && bw < 160)
 		bw = 80;
 	else if (bw >= 40 && bw < 80)
 		bw = 40;
 	else if (bw >= 20 && bw < 40)
 		bw = 20;
 	else
 		bw = 0;

 	return bw;
 }

 static void
 ath11k_reg_update_rule(struct ieee80211_reg_rule *reg_rule, u32 start_freq,
 		       u32 end_freq, u32 bw, u32 ant_gain, u32 reg_pwr,
 		       u32 reg_flags)
 {
 	reg_rule->freq_range.start_freq_khz = MHZ_TO_KHZ(start_freq);
 	reg_rule->freq_range.end_freq_khz = MHZ_TO_KHZ(end_freq);
 	reg_rule->freq_range.max_bandwidth_khz = MHZ_TO_KHZ(bw);
 	reg_rule->power_rule.max_antenna_gain = DBI_TO_MBI(ant_gain);
 	reg_rule->power_rule.max_eirp = DBM_TO_MBM(reg_pwr);
 	reg_rule->flags = reg_flags;
 }

 static void
 ath11k_reg_update_weather_radar_band(struct ath11k_base *ab,
 				     struct ieee80211_regdomain *regd,
 				     struct cur_reg_rule *reg_rule,
 				     u8 *rule_idx, u32 flags, u16 max_bw)
 {
 	u32 start_freq;
 	u32 end_freq;
 	u16 bw;
 	u8 i;

 	i = *rule_idx;

 	/* there might be situations when even the input rule must be dropped */
 	i--;

 	/* frequencies below weather radar */
 	bw = ath11k_reg_adjust_bw(reg_rule->start_freq,
 				  ETSI_WEATHER_RADAR_BAND_LOW, max_bw);
 	if (bw > 0) {
 		i++;

 		ath11k_reg_update_rule(regd->reg_rules + i,
 				       reg_rule->start_freq,
 				       ETSI_WEATHER_RADAR_BAND_LOW, bw,
 				       reg_rule->ant_gain, reg_rule->reg_power,
 				       flags);

 		ath11k_dbg(ab, ATH11K_DBG_REG,
 			   "\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d)\n",
 			   i + 1, reg_rule->start_freq,
 			   ETSI_WEATHER_RADAR_BAND_LOW, bw, reg_rule->ant_gain,
 			   reg_rule->reg_power, regd->reg_rules[i].dfs_cac_ms,
 			   flags);
 	}

 	/* weather radar frequencies */
 	start_freq = max_t(u32, reg_rule->start_freq,
 			   ETSI_WEATHER_RADAR_BAND_LOW);
 	end_freq = min_t(u32, reg_rule->end_freq, ETSI_WEATHER_RADAR_BAND_HIGH);

 	bw = ath11k_reg_adjust_bw(start_freq, end_freq, max_bw);
 	if (bw > 0) {
 		i++;

 		ath11k_reg_update_rule(regd->reg_rules + i, start_freq,
 				       end_freq, bw, reg_rule->ant_gain,
 				       reg_rule->reg_power, flags);

 		regd->reg_rules[i].dfs_cac_ms = ETSI_WEATHER_RADAR_BAND_CAC_TIMEOUT;

 		ath11k_dbg(ab, ATH11K_DBG_REG,
 			   "\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d)\n",
 			   i + 1, start_freq, end_freq, bw,
 			   reg_rule->ant_gain, reg_rule->reg_power,
 			   regd->reg_rules[i].dfs_cac_ms, flags);
 	}

 	/* frequencies above weather radar */
 	bw = ath11k_reg_adjust_bw(ETSI_WEATHER_RADAR_BAND_HIGH,
 				  reg_rule->end_freq, max_bw);
 	if (bw > 0) {
 		i++;

 		ath11k_reg_update_rule(regd->reg_rules + i,
 				       ETSI_WEATHER_RADAR_BAND_HIGH,
 				       reg_rule->end_freq, bw,
 				       reg_rule->ant_gain, reg_rule->reg_power,
 				       flags);

 		ath11k_dbg(ab, ATH11K_DBG_REG,
 			   "\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d)\n",
 			   i + 1, ETSI_WEATHER_RADAR_BAND_HIGH,
 			   reg_rule->end_freq, bw, reg_rule->ant_gain,
 			   reg_rule->reg_power, regd->reg_rules[i].dfs_cac_ms,
 			   flags);
 	}

 	*rule_idx = i;
 }

 struct ieee80211_regdomain *
 ath11k_reg_build_regd(struct ath11k_base *ab,
 		      struct cur_regulatory_info *reg_info, bool intersect)
 {
 	struct ieee80211_regdomain *tmp_regd, *default_regd, *new_regd = NULL;
 	struct cur_reg_rule *reg_rule;
 	u8 i = 0, j = 0;
 	u8 num_rules;
 	u16 max_bw;
 	u32 flags;
 	char alpha2[3];

 	num_rules = reg_info->num_5g_reg_rules + reg_info->num_2g_reg_rules;

 	if (!num_rules)
 		goto ret;

 	/* Add max additional rules to accommodate weather radar band */
 	if (reg_info->dfs_region == ATH11K_DFS_REG_ETSI)
 		num_rules += 2;

 	tmp_regd =  kzalloc(sizeof(*tmp_regd) +
 			(num_rules * sizeof(struct ieee80211_reg_rule)),
 			GFP_ATOMIC);
 	if (!tmp_regd)
 		goto ret;

 	memcpy(tmp_regd->alpha2, reg_info->alpha2, REG_ALPHA2_LEN + 1);
 	memcpy(alpha2, reg_info->alpha2, REG_ALPHA2_LEN + 1);
 	alpha2[2] = '\0';
 	tmp_regd->dfs_region = ath11k_map_fw_dfs_region(reg_info->dfs_region);

 	ath11k_dbg(ab, ATH11K_DBG_REG,
 		   "\r\nCountry %s, CFG Regdomain %s FW Regdomain %d, num_reg_rules %d\n",
 		   alpha2, ath11k_reg_get_regdom_str(tmp_regd->dfs_region),
 		   reg_info->dfs_region, num_rules);
 	/* Update reg_rules[] below. Firmware is expected to
 	 * send these rules in order(2G rules first and then 5G)
 	 */
 	for (; i < num_rules; i++) {
 		if (reg_info->num_2g_reg_rules &&
 		    (i < reg_info->num_2g_reg_rules)) {
 			reg_rule = reg_info->reg_rules_2g_ptr + i;
 			max_bw = min_t(u16, reg_rule->max_bw,
 				       reg_info->max_bw_2g);
 			flags = 0;
 		} else if (reg_info->num_5g_reg_rules &&
 			   (j < reg_info->num_5g_reg_rules)) {
 			reg_rule = reg_info->reg_rules_5g_ptr + j++;
 			max_bw = min_t(u16, reg_rule->max_bw,
 				       reg_info->max_bw_5g);

 			/* FW doesn't pass NL80211_RRF_AUTO_BW flag for
 			 * BW Auto correction, we can enable this by default
 			 * for all 5G rules here. The regulatory core performs
 			 * BW correction if required and applies flags as
 			 * per other BW rule flags we pass from here
 			 */
 			flags = NL80211_RRF_AUTO_BW;
 		} else {
 			break;
 		}

 		flags |= ath11k_map_fw_reg_flags(reg_rule->flags);

 		ath11k_reg_update_rule(tmp_regd->reg_rules + i,
 				       reg_rule->start_freq,
 				       reg_rule->end_freq, max_bw,
 				       reg_rule->ant_gain, reg_rule->reg_power,
 				       flags);

 		/* Update dfs cac timeout if the dfs domain is ETSI and the
 		 * new rule covers weather radar band.
 		 * Default value of '0' corresponds to 60s timeout, so no
 		 * need to update that for other rules.
 		 */
 		if (flags & NL80211_RRF_DFS &&
 		    reg_info->dfs_region == ATH11K_DFS_REG_ETSI &&
 		    (reg_rule->end_freq > ETSI_WEATHER_RADAR_BAND_LOW &&
 		    reg_rule->start_freq < ETSI_WEATHER_RADAR_BAND_HIGH)){
 			ath11k_reg_update_weather_radar_band(ab, tmp_regd,
 							     reg_rule, &i,
 							     flags, max_bw);
 			continue;
 		}

 		ath11k_dbg(ab, ATH11K_DBG_REG,
 			   "\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d)\n",
 			   i + 1, reg_rule->start_freq, reg_rule->end_freq,
 			   max_bw, reg_rule->ant_gain, reg_rule->reg_power,
 			   tmp_regd->reg_rules[i].dfs_cac_ms,
 			   flags);
 	}

 	tmp_regd->n_reg_rules = i;

 	if (intersect) {
 		default_regd = ab->default_regd[reg_info->phy_id];

 		/* Get a new regd by intersecting the received regd with
 		 * our default regd.
 		 */
 		new_regd = ath11k_regd_intersect(default_regd, tmp_regd);
 		kfree(tmp_regd);
 		if (!new_regd) {
 			ath11k_warn(ab, "Unable to create intersected regdomain\n");
 			goto ret;
 		}
 	} else {
 		new_regd = tmp_regd;
 	}

 ret:
 	return new_regd;
 }

 void ath11k_regd_update_work(struct work_struct *work)
 {
 	struct ath11k *ar = container_of(work, struct ath11k,
 					 regd_update_work);
 	int ret;

 	ret = ath11k_regd_update(ar);
 	if (ret) {
 		/* Firmware has already moved to the new regd. We need
 		 * to maintain channel consistency across FW, Host driver
 		 * and userspace. Hence as a fallback mechanism we can set
 		 * the prev or default country code to the firmware.
 		 */
 		/* TODO: Implement Fallback Mechanism */
 	}
 }

 void ath11k_reg_init(struct ath11k *ar)
 {
 	ar->hw->wiphy->regulatory_flags = REGULATORY_WIPHY_SELF_MANAGED;
 	ar->hw->wiphy->reg_notifier = ath11k_reg_notifier;
 }

 void ath11k_reg_free(struct ath11k_base *ab)
 {
 	int i;

 	for (i = 0; i < ab->hw_params.max_radios; i++) {
 		kfree(ab->default_regd[i]);
 		kfree(ab->new_regd[i]);
 	}
 }
	// SPDX-License-Identifier: BSD-3-Clause-Clear
	/*
	* Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
	*/
	#include <linux/rtnetlink.h>

	#include "core.h"
	#include "debug.h"

	/* World regdom to be used in case default regd from fw is unavailable */
	#define ATH11K_2GHZ_CH01_11 REG_RULE(2412 - 10, 2462 + 10, 40, 0, 20, 0)
	#define ATH11K_5GHZ_5150_5350 REG_RULE(5150 - 10, 5350 + 10, 80, 0, 30,\
	NL80211_RRF_NO_IR)
	#define ATH11K_5GHZ_5725_5850 REG_RULE(5725 - 10, 5850 + 10, 80, 0, 30,\
	NL80211_RRF_NO_IR)

	#define ETSI_WEATHER_RADAR_BAND_LOW 5590
	#define ETSI_WEATHER_RADAR_BAND_HIGH 5650
	#define ETSI_WEATHER_RADAR_BAND_CAC_TIMEOUT 600000

	static const struct ieee80211_regdomain ath11k_world_regd = {
	.n_reg_rules = 3,
	.alpha2 = "00",
	.reg_rules = {
	ATH11K_2GHZ_CH01_11,
	ATH11K_5GHZ_5150_5350,
	ATH11K_5GHZ_5725_5850,
	}
	};

	static bool ath11k_regdom_changes(struct ath11k ar, char alpha2)
	{
	const struct ieee80211_regdomain *regd;

	regd = rcu_dereference_rtnl(ar->hw->wiphy->regd);
	/* This can happen during wiphy registration where the previous
	* user request is received before we update the regd received
	* from firmware.
	*/
	if (!regd)
	return true;

	return memcmp(regd->alpha2, alpha2, 2) != 0;
	}

	static void
	ath11k_reg_notifier(struct wiphy wiphy, struct regulatory_request request)
	{
	struct ieee80211_hw *hw = wiphy_to_ieee80211_hw(wiphy);
	struct wmi_init_country_params init_country_param;
	struct wmi_set_current_country_params set_current_param = {};
	struct ath11k *ar = hw->priv;
	int ret;

	ath11k_dbg(ar->ab, ATH11K_DBG_REG,
	"Regulatory Notification received for %s\n", wiphy_name(wiphy));

	/* Currently supporting only General User Hints. Cell base user
	* hints to be handled later.
	* Hints from other sources like Core, Beacons are not expected for
	* self managed wiphy's
	*/
	if (!(request->initiator == NL80211_REGDOM_SET_BY_USER &&
	request->user_reg_hint_type == NL80211_USER_REG_HINT_USER)) {
	ath11k_warn(ar->ab, "Unexpected Regulatory event for this wiphy\n");
	return;
	}

	if (!IS_ENABLED(CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS)) {
	ath11k_dbg(ar->ab, ATH11K_DBG_REG,
	"Country Setting is not allowed\n");
	return;
	}

	if (!ath11k_regdom_changes(ar, request->alpha2)) {
	ath11k_dbg(ar->ab, ATH11K_DBG_REG, "Country is already set\n");
	return;
	}

	/* Set the country code to the firmware and will receive
	* the WMI_REG_CHAN_LIST_CC EVENT for updating the
	* reg info
	*/
	if (ar->ab->hw_params.current_cc_support) {
	memcpy(&set_current_param.alpha2, request->alpha2, 2);
	memcpy(&ar->alpha2, &set_current_param.alpha2, 2);
	ret = ath11k_wmi_send_set_current_country_cmd(ar, &set_current_param);
	if (ret)
	ath11k_warn(ar->ab,
	"failed set current country code: %d\n", ret);
	} else {
	init_country_param.flags = ALPHA_IS_SET;
	memcpy(&init_country_param.cc_info.alpha2, request->alpha2, 2);
	init_country_param.cc_info.alpha2[2] = 0;

	ret = ath11k_wmi_send_init_country_cmd(ar, init_country_param);
	if (ret)
	ath11k_warn(ar->ab,
	"INIT Country code set to fw failed : %d\n", ret);
	}

	ath11k_mac_11d_scan_stop(ar);
	ar->regdom_set_by_user = true;
	}

	int ath11k_reg_update_chan_list(struct ath11k *ar, bool wait)
	{
	struct ieee80211_supported_band **bands;
	struct scan_chan_list_params *params;
	struct ieee80211_channel *channel;
	struct ieee80211_hw *hw = ar->hw;
	struct channel_param *ch;
	enum nl80211_band band;
	int num_channels = 0;
	int i, ret, left;

	if (wait && ar->state_11d != ATH11K_11D_IDLE) {
	left = wait_for_completion_timeout(&ar->completed_11d_scan,
	ATH11K_SCAN_TIMEOUT_HZ);
	if (!left) {
	ath11k_dbg(ar->ab, ATH11K_DBG_REG,
	"failed to receive 11d scan complete: timed out\n");
	ar->state_11d = ATH11K_11D_IDLE;
	}
	ath11k_dbg(ar->ab, ATH11K_DBG_REG,
	"reg 11d scan wait left time %d\n", left);
	}

	if (wait &&
	(ar->scan.state == ATH11K_SCAN_STARTING \|\|
	ar->scan.state == ATH11K_SCAN_RUNNING)) {
	left = wait_for_completion_timeout(&ar->scan.completed,
	ATH11K_SCAN_TIMEOUT_HZ);
	if (!left)
	ath11k_dbg(ar->ab, ATH11K_DBG_REG,
	"failed to receive hw scan complete: timed out\n");

	ath11k_dbg(ar->ab, ATH11K_DBG_REG,
	"reg hw scan wait left time %d\n", left);
	}

	if (ar->state == ATH11K_STATE_RESTARTING)
	return 0;

	bands = hw->wiphy->bands;
	for (band = 0; band < NUM_NL80211_BANDS; band++) {
	if (!bands[band])
	continue;

	for (i = 0; i < bands[band]->n_channels; i++) {
	if (bands[band]->channels[i].flags &
	IEEE80211_CHAN_DISABLED)
	continue;

	num_channels++;
	}
	}

	if (WARN_ON(!num_channels))
	return -EINVAL;

	params = kzalloc(struct_size(params, ch_param, num_channels),
	GFP_KERNEL);
	if (!params)
	return -ENOMEM;

	params->pdev_id = ar->pdev->pdev_id;
	params->nallchans = num_channels;

	ch = params->ch_param;

	for (band = 0; band < NUM_NL80211_BANDS; band++) {
	if (!bands[band])
	continue;

	for (i = 0; i < bands[band]->n_channels; i++) {
	channel = &bands[band]->channels[i];

	if (channel->flags & IEEE80211_CHAN_DISABLED)
	continue;

	/* TODO: Set to true/false based on some condition? */
	ch->allow_ht = true;
	ch->allow_vht = true;
	ch->allow_he = true;

	ch->dfs_set =
	!!(channel->flags & IEEE80211_CHAN_RADAR);
	ch->is_chan_passive = !!(channel->flags &
	IEEE80211_CHAN_NO_IR);
	ch->is_chan_passive \|= ch->dfs_set;
	ch->mhz = channel->center_freq;
	ch->cfreq1 = channel->center_freq;
	ch->minpower = 0;
	ch->maxpower = channel->max_power * 2;
	ch->maxregpower = channel->max_reg_power * 2;
	ch->antennamax = channel->max_antenna_gain * 2;

	/* TODO: Use appropriate phymodes */
	if (channel->band == NL80211_BAND_2GHZ)
	ch->phy_mode = MODE_11G;
	else
	ch->phy_mode = MODE_11A;

	if (channel->band == NL80211_BAND_6GHZ &&
	cfg80211_channel_is_psc(channel))
	ch->psc_channel = true;

	ath11k_dbg(ar->ab, ATH11K_DBG_WMI,
	"mac channel [%d/%d] freq %d maxpower %d regpower %d antenna %d mode %d\n",
	i, params->nallchans,
	ch->mhz, ch->maxpower, ch->maxregpower,
	ch->antennamax, ch->phy_mode);

	ch++;
	/* TODO: use quarrter/half rate, cfreq12, dfs_cfreq2
	* set_agile, reg_class_idx
	*/
	}
	}

	ret = ath11k_wmi_send_scan_chan_list_cmd(ar, params);
	kfree(params);

	return ret;
	}

	static void ath11k_copy_regd(struct ieee80211_regdomain *regd_orig,
	struct ieee80211_regdomain *regd_copy)
	{
	u8 i;

	/* The caller should have checked error conditions */
	memcpy(regd_copy, regd_orig, sizeof(*regd_orig));

	for (i = 0; i < regd_orig->n_reg_rules; i++)
	memcpy(&regd_copy->reg_rules[i], &regd_orig->reg_rules[i],
	sizeof(struct ieee80211_reg_rule));
	}

	int ath11k_regd_update(struct ath11k *ar)
	{
	struct ieee80211_regdomain regd, regd_copy = NULL;
	int ret, regd_len, pdev_id;
	struct ath11k_base *ab;

	ab = ar->ab;
	pdev_id = ar->pdev_idx;

	spin_lock_bh(&ab->base_lock);

	/* Prefer the latest regd update over default if it's available */
	if (ab->new_regd[pdev_id]) {
	regd = ab->new_regd[pdev_id];
	} else {
	/* Apply the regd received during init through
	* WMI_REG_CHAN_LIST_CC event. In case of failure to
	* receive the regd, initialize with a default world
	* regulatory.
	*/
	if (ab->default_regd[pdev_id]) {
	regd = ab->default_regd[pdev_id];
	} else {
	ath11k_warn(ab,
	"failed to receive default regd during init\n");
	regd = (struct ieee80211_regdomain *)&ath11k_world_regd;
	}
	}

	if (!regd) {
	ret = -EINVAL;
	spin_unlock_bh(&ab->base_lock);
	goto err;
	}

	regd_len = sizeof(regd) + (regd->n_reg_rules
	sizeof(struct ieee80211_reg_rule));

	regd_copy = kzalloc(regd_len, GFP_ATOMIC);
	if (regd_copy)
	ath11k_copy_regd(regd, regd_copy);

	spin_unlock_bh(&ab->base_lock);

	if (!regd_copy) {
	ret = -ENOMEM;
	goto err;
	}

	rtnl_lock();
	wiphy_lock(ar->hw->wiphy);
	ret = regulatory_set_wiphy_regd_sync(ar->hw->wiphy, regd_copy);
	wiphy_unlock(ar->hw->wiphy);
	rtnl_unlock();

	kfree(regd_copy);

	if (ret)
	goto err;

	if (ar->state == ATH11K_STATE_ON) {
	ret = ath11k_reg_update_chan_list(ar, true);
	if (ret)
	goto err;
	}

	return 0;
	err:
	ath11k_warn(ab, "failed to perform regd update : %d\n", ret);
	return ret;
	}

	static enum nl80211_dfs_regions
	ath11k_map_fw_dfs_region(enum ath11k_dfs_region dfs_region)
	{
	switch (dfs_region) {
	case ATH11K_DFS_REG_FCC:
	case ATH11K_DFS_REG_CN:
	return NL80211_DFS_FCC;
	case ATH11K_DFS_REG_ETSI:
	case ATH11K_DFS_REG_KR:
	return NL80211_DFS_ETSI;
	case ATH11K_DFS_REG_MKK:
	case ATH11K_DFS_REG_MKK_N:
	return NL80211_DFS_JP;
	default:
	return NL80211_DFS_UNSET;
	}
	}

	static u32 ath11k_map_fw_reg_flags(u16 reg_flags)
	{
	u32 flags = 0;

	if (reg_flags & REGULATORY_CHAN_NO_IR)
	flags = NL80211_RRF_NO_IR;

	if (reg_flags & REGULATORY_CHAN_RADAR)
	flags \|= NL80211_RRF_DFS;

	if (reg_flags & REGULATORY_CHAN_NO_OFDM)
	flags \|= NL80211_RRF_NO_OFDM;

	if (reg_flags & REGULATORY_CHAN_INDOOR_ONLY)
	flags \|= NL80211_RRF_NO_OUTDOOR;

	if (reg_flags & REGULATORY_CHAN_NO_HT40)
	flags \|= NL80211_RRF_NO_HT40;

	if (reg_flags & REGULATORY_CHAN_NO_80MHZ)
	flags \|= NL80211_RRF_NO_80MHZ;

	if (reg_flags & REGULATORY_CHAN_NO_160MHZ)
	flags \|= NL80211_RRF_NO_160MHZ;

	return flags;
	}

	static bool
	ath11k_reg_can_intersect(struct ieee80211_reg_rule *rule1,
	struct ieee80211_reg_rule *rule2)
	{
	u32 start_freq1, end_freq1;
	u32 start_freq2, end_freq2;

	start_freq1 = rule1->freq_range.start_freq_khz;
	start_freq2 = rule2->freq_range.start_freq_khz;

	end_freq1 = rule1->freq_range.end_freq_khz;
	end_freq2 = rule2->freq_range.end_freq_khz;

	if ((start_freq1 >= start_freq2 &&
	start_freq1 < end_freq2) \|\|
	(start_freq2 > start_freq1 &&
	start_freq2 < end_freq1))
	return true;

	/* TODO: Should we restrict intersection feasibility
	* based on min bandwidth of the intersected region also,
	* say the intersected rule should have a min bandwidth
	* of 20MHz?
	*/

	return false;
	}

	static void ath11k_reg_intersect_rules(struct ieee80211_reg_rule *rule1,
	struct ieee80211_reg_rule *rule2,
	struct ieee80211_reg_rule *new_rule)
	{
	u32 start_freq1, end_freq1;
	u32 start_freq2, end_freq2;
	u32 freq_diff, max_bw;

	start_freq1 = rule1->freq_range.start_freq_khz;
	start_freq2 = rule2->freq_range.start_freq_khz;

	end_freq1 = rule1->freq_range.end_freq_khz;
	end_freq2 = rule2->freq_range.end_freq_khz;

	new_rule->freq_range.start_freq_khz = max_t(u32, start_freq1,
	start_freq2);
	new_rule->freq_range.end_freq_khz = min_t(u32, end_freq1, end_freq2);

	freq_diff = new_rule->freq_range.end_freq_khz -
	new_rule->freq_range.start_freq_khz;
	max_bw = min_t(u32, rule1->freq_range.max_bandwidth_khz,
	rule2->freq_range.max_bandwidth_khz);
	new_rule->freq_range.max_bandwidth_khz = min_t(u32, max_bw, freq_diff);

	new_rule->power_rule.max_antenna_gain =
	min_t(u32, rule1->power_rule.max_antenna_gain,
	rule2->power_rule.max_antenna_gain);

	new_rule->power_rule.max_eirp = min_t(u32, rule1->power_rule.max_eirp,
	rule2->power_rule.max_eirp);

	/* Use the flags of both the rules */
	new_rule->flags = rule1->flags \| rule2->flags;

	/* To be safe, lts use the max cac timeout of both rules */
	new_rule->dfs_cac_ms = max_t(u32, rule1->dfs_cac_ms,
	rule2->dfs_cac_ms);
	}

	static struct ieee80211_regdomain *
	ath11k_regd_intersect(struct ieee80211_regdomain *default_regd,
	struct ieee80211_regdomain *curr_regd)
	{
	u8 num_old_regd_rules, num_curr_regd_rules, num_new_regd_rules;
	struct ieee80211_reg_rule old_rule, curr_rule, *new_rule;
	struct ieee80211_regdomain *new_regd = NULL;
	u8 i, j, k;

	num_old_regd_rules = default_regd->n_reg_rules;
	num_curr_regd_rules = curr_regd->n_reg_rules;
	num_new_regd_rules = 0;

	/* Find the number of intersecting rules to allocate new regd memory */
	for (i = 0; i < num_old_regd_rules; i++) {
	old_rule = default_regd->reg_rules + i;
	for (j = 0; j < num_curr_regd_rules; j++) {
	curr_rule = curr_regd->reg_rules + j;

	if (ath11k_reg_can_intersect(old_rule, curr_rule))
	num_new_regd_rules++;
	}
	}

	if (!num_new_regd_rules)
	return NULL;

	new_regd = kzalloc(sizeof(new_regd) + (num_new_regd_rules
	sizeof(struct ieee80211_reg_rule)),
	GFP_ATOMIC);

	if (!new_regd)
	return NULL;

	/* We set the new country and dfs region directly and only trim
	* the freq, power, antenna gain by intersecting with the
	* default regdomain. Also MAX of the dfs cac timeout is selected.
	*/
	new_regd->n_reg_rules = num_new_regd_rules;
	memcpy(new_regd->alpha2, curr_regd->alpha2, sizeof(new_regd->alpha2));
	new_regd->dfs_region = curr_regd->dfs_region;
	new_rule = new_regd->reg_rules;

	for (i = 0, k = 0; i < num_old_regd_rules; i++) {
	old_rule = default_regd->reg_rules + i;
	for (j = 0; j < num_curr_regd_rules; j++) {
	curr_rule = curr_regd->reg_rules + j;

	if (ath11k_reg_can_intersect(old_rule, curr_rule))
	ath11k_reg_intersect_rules(old_rule, curr_rule,
	(new_rule + k++));
	}
	}
	return new_regd;
	}

	static const char *
	ath11k_reg_get_regdom_str(enum nl80211_dfs_regions dfs_region)
	{
	switch (dfs_region) {
	case NL80211_DFS_FCC:
	return "FCC";
	case NL80211_DFS_ETSI:
	return "ETSI";
	case NL80211_DFS_JP:
	return "JP";
	default:
	return "UNSET";
	}
	}

	static u16
	ath11k_reg_adjust_bw(u16 start_freq, u16 end_freq, u16 max_bw)
	{
	u16 bw;

	if (end_freq <= start_freq)
	return 0;

	bw = end_freq - start_freq;
	bw = min_t(u16, bw, max_bw);

	if (bw >= 80 && bw < 160)
	bw = 80;
	else if (bw >= 40 && bw < 80)
	bw = 40;
	else if (bw >= 20 && bw < 40)
	bw = 20;
	else
	bw = 0;

	return bw;
	}

	static void
	ath11k_reg_update_rule(struct ieee80211_reg_rule *reg_rule, u32 start_freq,
	u32 end_freq, u32 bw, u32 ant_gain, u32 reg_pwr,
	u32 reg_flags)
	{
	reg_rule->freq_range.start_freq_khz = MHZ_TO_KHZ(start_freq);
	reg_rule->freq_range.end_freq_khz = MHZ_TO_KHZ(end_freq);
	reg_rule->freq_range.max_bandwidth_khz = MHZ_TO_KHZ(bw);
	reg_rule->power_rule.max_antenna_gain = DBI_TO_MBI(ant_gain);
	reg_rule->power_rule.max_eirp = DBM_TO_MBM(reg_pwr);
	reg_rule->flags = reg_flags;
	}

	static void
	ath11k_reg_update_weather_radar_band(struct ath11k_base *ab,
	struct ieee80211_regdomain *regd,
	struct cur_reg_rule *reg_rule,
	u8 *rule_idx, u32 flags, u16 max_bw)
	{
	u32 start_freq;
	u32 end_freq;
	u16 bw;
	u8 i;

	i = *rule_idx;

	/* there might be situations when even the input rule must be dropped */
	i--;

	/* frequencies below weather radar */
	bw = ath11k_reg_adjust_bw(reg_rule->start_freq,
	ETSI_WEATHER_RADAR_BAND_LOW, max_bw);
	if (bw > 0) {
	i++;

	ath11k_reg_update_rule(regd->reg_rules + i,
	reg_rule->start_freq,
	ETSI_WEATHER_RADAR_BAND_LOW, bw,
	reg_rule->ant_gain, reg_rule->reg_power,
	flags);

	ath11k_dbg(ab, ATH11K_DBG_REG,
	"\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d)\n",
	i + 1, reg_rule->start_freq,
	ETSI_WEATHER_RADAR_BAND_LOW, bw, reg_rule->ant_gain,
	reg_rule->reg_power, regd->reg_rules[i].dfs_cac_ms,
	flags);
	}

	/* weather radar frequencies */
	start_freq = max_t(u32, reg_rule->start_freq,
	ETSI_WEATHER_RADAR_BAND_LOW);
	end_freq = min_t(u32, reg_rule->end_freq, ETSI_WEATHER_RADAR_BAND_HIGH);

	bw = ath11k_reg_adjust_bw(start_freq, end_freq, max_bw);
	if (bw > 0) {
	i++;

	ath11k_reg_update_rule(regd->reg_rules + i, start_freq,
	end_freq, bw, reg_rule->ant_gain,
	reg_rule->reg_power, flags);

	regd->reg_rules[i].dfs_cac_ms = ETSI_WEATHER_RADAR_BAND_CAC_TIMEOUT;

	ath11k_dbg(ab, ATH11K_DBG_REG,
	"\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d)\n",
	i + 1, start_freq, end_freq, bw,
	reg_rule->ant_gain, reg_rule->reg_power,
	regd->reg_rules[i].dfs_cac_ms, flags);
	}

	/* frequencies above weather radar */
	bw = ath11k_reg_adjust_bw(ETSI_WEATHER_RADAR_BAND_HIGH,
	reg_rule->end_freq, max_bw);
	if (bw > 0) {
	i++;

	ath11k_reg_update_rule(regd->reg_rules + i,
	ETSI_WEATHER_RADAR_BAND_HIGH,
	reg_rule->end_freq, bw,
	reg_rule->ant_gain, reg_rule->reg_power,
	flags);

	ath11k_dbg(ab, ATH11K_DBG_REG,
	"\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d)\n",
	i + 1, ETSI_WEATHER_RADAR_BAND_HIGH,
	reg_rule->end_freq, bw, reg_rule->ant_gain,
	reg_rule->reg_power, regd->reg_rules[i].dfs_cac_ms,
	flags);
	}

	*rule_idx = i;
	}

	struct ieee80211_regdomain *
	ath11k_reg_build_regd(struct ath11k_base *ab,
	struct cur_regulatory_info *reg_info, bool intersect)
	{
	struct ieee80211_regdomain tmp_regd, default_regd, *new_regd = NULL;
	struct cur_reg_rule *reg_rule;
	u8 i = 0, j = 0;
	u8 num_rules;
	u16 max_bw;
	u32 flags;
	char alpha2[3];

	num_rules = reg_info->num_5g_reg_rules + reg_info->num_2g_reg_rules;

	if (!num_rules)
	goto ret;

	/* Add max additional rules to accommodate weather radar band */
	if (reg_info->dfs_region == ATH11K_DFS_REG_ETSI)
	num_rules += 2;

	tmp_regd = kzalloc(sizeof(*tmp_regd) +
	(num_rules * sizeof(struct ieee80211_reg_rule)),
	GFP_ATOMIC);
	if (!tmp_regd)
	goto ret;

	memcpy(tmp_regd->alpha2, reg_info->alpha2, REG_ALPHA2_LEN + 1);
	memcpy(alpha2, reg_info->alpha2, REG_ALPHA2_LEN + 1);
	alpha2[2] = '\0';
	tmp_regd->dfs_region = ath11k_map_fw_dfs_region(reg_info->dfs_region);

	ath11k_dbg(ab, ATH11K_DBG_REG,
	"\r\nCountry %s, CFG Regdomain %s FW Regdomain %d, num_reg_rules %d\n",
	alpha2, ath11k_reg_get_regdom_str(tmp_regd->dfs_region),
	reg_info->dfs_region, num_rules);
	/* Update reg_rules[] below. Firmware is expected to
	* send these rules in order(2G rules first and then 5G)
	*/
	for (; i < num_rules; i++) {
	if (reg_info->num_2g_reg_rules &&
	(i < reg_info->num_2g_reg_rules)) {
	reg_rule = reg_info->reg_rules_2g_ptr + i;
	max_bw = min_t(u16, reg_rule->max_bw,
	reg_info->max_bw_2g);
	flags = 0;
	} else if (reg_info->num_5g_reg_rules &&
	(j < reg_info->num_5g_reg_rules)) {
	reg_rule = reg_info->reg_rules_5g_ptr + j++;
	max_bw = min_t(u16, reg_rule->max_bw,
	reg_info->max_bw_5g);

	/* FW doesn't pass NL80211_RRF_AUTO_BW flag for
	* BW Auto correction, we can enable this by default
	* for all 5G rules here. The regulatory core performs
	* BW correction if required and applies flags as
	* per other BW rule flags we pass from here
	*/
	flags = NL80211_RRF_AUTO_BW;
	} else {
	break;
	}

	flags \|= ath11k_map_fw_reg_flags(reg_rule->flags);

	ath11k_reg_update_rule(tmp_regd->reg_rules + i,
	reg_rule->start_freq,
	reg_rule->end_freq, max_bw,
	reg_rule->ant_gain, reg_rule->reg_power,
	flags);

	/* Update dfs cac timeout if the dfs domain is ETSI and the
	* new rule covers weather radar band.
	* Default value of '0' corresponds to 60s timeout, so no
	* need to update that for other rules.
	*/
	if (flags & NL80211_RRF_DFS &&
	reg_info->dfs_region == ATH11K_DFS_REG_ETSI &&
	(reg_rule->end_freq > ETSI_WEATHER_RADAR_BAND_LOW &&
	reg_rule->start_freq < ETSI_WEATHER_RADAR_BAND_HIGH)){
	ath11k_reg_update_weather_radar_band(ab, tmp_regd,
	reg_rule, &i,
	flags, max_bw);
	continue;
	}

	ath11k_dbg(ab, ATH11K_DBG_REG,
	"\t%d. (%d - %d @ %d) (%d, %d) (%d ms) (FLAGS %d)\n",
	i + 1, reg_rule->start_freq, reg_rule->end_freq,
	max_bw, reg_rule->ant_gain, reg_rule->reg_power,
	tmp_regd->reg_rules[i].dfs_cac_ms,
	flags);
	}

	tmp_regd->n_reg_rules = i;

	if (intersect) {
	default_regd = ab->default_regd[reg_info->phy_id];

	/* Get a new regd by intersecting the received regd with
	* our default regd.
	*/
	new_regd = ath11k_regd_intersect(default_regd, tmp_regd);
	kfree(tmp_regd);
	if (!new_regd) {
	ath11k_warn(ab, "Unable to create intersected regdomain\n");
	goto ret;
	}
	} else {
	new_regd = tmp_regd;
	}

	ret:
	return new_regd;
	}

	void ath11k_regd_update_work(struct work_struct *work)
	{
	struct ath11k *ar = container_of(work, struct ath11k,
	regd_update_work);
	int ret;

	ret = ath11k_regd_update(ar);
	if (ret) {
	/* Firmware has already moved to the new regd. We need
	* to maintain channel consistency across FW, Host driver
	* and userspace. Hence as a fallback mechanism we can set
	* the prev or default country code to the firmware.
	*/
	/* TODO: Implement Fallback Mechanism */
	}
	}

	void ath11k_reg_init(struct ath11k *ar)
	{
	ar->hw->wiphy->regulatory_flags = REGULATORY_WIPHY_SELF_MANAGED;
	ar->hw->wiphy->reg_notifier = ath11k_reg_notifier;
	}

	void ath11k_reg_free(struct ath11k_base *ab)
	{
	int i;

	for (i = 0; i < ab->hw_params.max_radios; i++) {
	kfree(ab->default_regd[i]);
	kfree(ab->new_regd[i]);
	}
	}