path: root/drivers/net/wireless/ath/ath11k/reg.c

// SPDX-License-Identifier: BSD-3-Clause-Clear
/*
 * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
 * Copyright (c) 2021-2024 Qualcomm Innovation Center, Inc. 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 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(&ar->alpha2, request->alpha2, 2);
		ret = ath11k_reg_set_cc(ar);
		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,
			   "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,
			   "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 <