// SPDX-License-Identifier: GPL-2.0
/******************************************************************************
 *
 * Copyright(c) 2009-2010  Realtek Corporation.
 *
 *****************************************************************************/

#include <drv_types.h>
#include <rtw_debug.h>

#include <rtw_wifi_regd.h>

/*
 * REG_RULE(freq start, freq end, bandwidth, max gain, eirp, reg_flags)
 */

/*
 * Only these channels all allow active
 * scan on all world regulatory domains
 */

/* 2G chan 01 - chan 11 */
#define RTW_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
 */

/* 2G chan 12 - chan 13, PASSIV SCAN */
#define RTW_2GHZ_CH12_13	\
	REG_RULE(2467 - 10, 2472 + 10, 40, 0, 20,	\
	NL80211_RRF_PASSIVE_SCAN)

/* 2G chan 14, PASSIVS SCAN, NO OFDM (B only) */
#define RTW_2GHZ_CH14	\
	REG_RULE(2484 - 10, 2484 + 10, 40, 0, 20,	\
	NL80211_RRF_PASSIVE_SCAN | NL80211_RRF_NO_OFDM)

static const struct ieee80211_regdomain rtw_regdom_rd = {
	.n_reg_rules = 3,
	.alpha2 = "99",
	.reg_rules = {
		RTW_2GHZ_CH01_11,
		RTW_2GHZ_CH12_13,
	}
};

static int rtw_ieee80211_channel_to_frequency(int chan, int band)
{
	/* see 802.11 17.3.8.3.2 and Annex J
	 * there are overlapping channel numbers in 5GHz and 2GHz bands
	 */

	/* NL80211_BAND_2GHZ */
	if (chan == 14)
		return 2484;
	else if (chan < 14)
		return 2407 + chan * 5;
	else
		return 0;	/* not supported */
}

static void _rtw_reg_apply_flags(struct wiphy *wiphy)
{
	struct adapter *padapter = wiphy_to_adapter(wiphy);
	struct mlme_ext_priv *pmlmeext = &padapter->mlmeextpriv;
	RT_CHANNEL_INFO *channel_set = pmlmeext->channel_set;
	u8 max_chan_nums = pmlmeext->max_chan_nums;

	struct ieee80211_supported_band *sband;
	struct ieee80211_channel *ch;
	unsigned int i, j;
	u16 channel;
	u32 freq;

	/* all channels disable */
	for (i = 0; i < NUM_NL80211_BANDS; i++) {
		sband = wiphy->bands[i];

		if (sband) {
			for (j = 0; j < sband->n_channels; j++) {
				ch = &sband->channels[j];

				if (ch)
					ch->flags = IEEE80211_CHAN_DISABLED;
			}
		}
	}

	/* channels apply by channel plans. */
	for (i = 0; i < max_chan_nums; i++) {
		channel = channel_set[i].ChannelNum;
		freq =
		    rtw_ieee80211_channel_to_frequency(channel,
						       NL80211_BAND_2GHZ);

		ch = ieee80211_get_channel(wiphy, freq);
		if (ch) {
			if (channel_set[i].ScanType == SCAN_PASSIVE)
				ch->flags = IEEE80211_CHAN_NO_IR;
			else
				ch->flags = 0;
		}
	}
}

static int _rtw_reg_notifier_apply(struct wiphy *wiphy,
				   struct regulatory_request *request,
				   struct rtw_regulatory *reg)
{
	/* Hard code flags */
	_rtw_reg_apply_flags(wiphy);
	return 0;
}

static const struct ieee80211_regdomain *_rtw_regdomain_select(struct
							       rtw_regulatory
							       *reg)
{
	return &rtw_regdom_rd;
}

static void _rtw_regd_init_wiphy(struct rtw_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_CUSTOM_REG;
	wiphy->regulatory_flags &= ~REGULATORY_STRICT_REG;
	wiphy->regulatory_flags &= ~REGULATORY_DISABLE_BEACON_HINTS;

	regd = _rtw_regdomain_select(reg);
	wiphy_apply_custom_regulatory(wiphy, regd);

	/* Hard code flags */
	_rtw_reg_apply_flags(wiphy);
}

int rtw_regd_init(struct adapter *padapter,
		  void (*reg_notifier)(struct wiphy *wiphy,
				       struct regulatory_request *request))
{
	struct wiphy *wiphy = padapter->rtw_wdev->wiphy;

	_rtw_regd_init_wiphy(NULL, wiphy, reg_notifier);

	return 0;
}

void rtw_reg_notifier(struct wiphy *wiphy, struct regulatory_request *request)
{
	struct rtw_regulatory *reg = NULL;

	DBG_8192C("%s\n", __func__);

	_rtw_reg_notifier_apply(wiphy, request, reg);
}