stats.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright( c ) 2009-2012  Realtek Corporation.*/

#include "wifi.h"
#include "stats.h"
#include <linux/export.h>

u8 rtl_query_rxpwrpercentage( s8 antpower )
{
	if ( ( antpower <= -100 ) || ( antpower >= 20 ) )
		return 0;
	else if ( antpower >= 0 )
		return 100;
	else
		return 100 + antpower;
}
EXPORT_SYMBOL( rtl_query_rxpwrpercentage );

u8 rtl_evm_db_to_percentage( s8 value )
{
	s8 ret_val = clamp( -value, 0, 33 ) * 3;

	if ( ret_val == 99 )
		ret_val = 100;

	return ret_val;
}
EXPORT_SYMBOL( rtl_evm_db_to_percentage );

static long rtl_translate_todbm( struct ieee80211_hw *hw,
			 u8 signal_strength_index )
{
	long signal_power;

	signal_power = ( long )( ( signal_strength_index + 1 ) >> 1 );
	signal_power -= 95;
	return signal_power;
}

long rtl_signal_scale_mapping( struct ieee80211_hw *hw, long currsig )
{
	long retsig;

	if ( currsig >= 61 && currsig <= 100 )
		retsig = 90 + ( ( currsig - 60 ) / 4 );
	else if ( currsig >= 41 && currsig <= 60 )
		retsig = 78 + ( ( currsig - 40 ) / 2 );
	else if ( currsig >= 31 && currsig <= 40 )
		retsig = 66 + ( currsig - 30 );
	else if ( currsig >= 21 && currsig <= 30 )
		retsig = 54 + ( currsig - 20 );
	else if ( currsig >= 5 && currsig <= 20 )
		retsig = 42 + ( ( ( currsig - 5 ) * 2 ) / 3 );
	else if ( currsig == 4 )
		retsig = 36;
	else if ( currsig == 3 )
		retsig = 27;
	else if ( currsig == 2 )
		retsig = 18;
	else if ( currsig == 1 )
		retsig = 9;
	else
		retsig = currsig;

	return retsig;
}
EXPORT_SYMBOL( rtl_signal_scale_mapping );

static void rtl_process_ui_rssi( struct ieee80211_hw *hw,
				struct rtl_stats *pstatus )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_phy *rtlphy = &( rtlpriv->phy );
	u8 rfpath;
	u32 last_rssi, tmpval;

	if ( !pstatus->packet_toself && !pstatus->packet_beacon )
		return;

	rtlpriv->stats.pwdb_all_cnt += pstatus->rx_pwdb_all;
	rtlpriv->stats.rssi_calculate_cnt++;

	if ( rtlpriv->stats.ui_rssi.total_num++ >= PHY_RSSI_SLID_WIN_MAX ) {
		rtlpriv->stats.ui_rssi.total_num = PHY_RSSI_SLID_WIN_MAX;
		last_rssi = rtlpriv->stats.ui_rssi.elements[
			rtlpriv->stats.ui_rssi.index];
		rtlpriv->stats.ui_rssi.total_val -= last_rssi;
	}
	rtlpriv->stats.ui_rssi.total_val += pstatus->signalstrength;
	rtlpriv->stats.ui_rssi.elements[rtlpriv->stats.ui_rssi.index++] =
	    pstatus->signalstrength;
	if ( rtlpriv->stats.ui_rssi.index >= PHY_RSSI_SLID_WIN_MAX )
		rtlpriv->stats.ui_rssi.index = 0;
	tmpval = rtlpriv->stats.ui_rssi.total_val /
		rtlpriv->stats.ui_rssi.total_num;
	rtlpriv->stats.signal_strength = rtl_translate_todbm( hw,
		( u8 ) tmpval );
	pstatus->rssi = rtlpriv->stats.signal_strength;

	if ( pstatus->is_cck )
		return;

	for ( rfpath = RF90_PATH_A; rfpath < rtlphy->num_total_rfpath;
	     rfpath++ ) {
		if ( rtlpriv->stats.rx_rssi_percentage[rfpath] == 0 ) {
			rtlpriv->stats.rx_rssi_percentage[rfpath] =
			    pstatus->rx_mimo_signalstrength[rfpath];

		}
		if ( pstatus->rx_mimo_signalstrength[rfpath] >
		    rtlpriv->stats.rx_rssi_percentage[rfpath] ) {
			rtlpriv->stats.rx_rssi_percentage[rfpath] =
			    ( ( rtlpriv->stats.rx_rssi_percentage[rfpath] *
			      ( RX_SMOOTH_FACTOR - 1 ) ) +
			     ( pstatus->rx_mimo_signalstrength[rfpath] ) ) /
			    ( RX_SMOOTH_FACTOR );
			rtlpriv->stats.rx_rssi_percentage[rfpath] =
			    rtlpriv->stats.rx_rssi_percentage[rfpath] + 1;
		} else {
			rtlpriv->stats.rx_rssi_percentage[rfpath] =
			    ( ( rtlpriv->stats.rx_rssi_percentage[rfpath] *
			      ( RX_SMOOTH_FACTOR - 1 ) ) +
			     ( pstatus->rx_mimo_signalstrength[rfpath] ) ) /
			    ( RX_SMOOTH_FACTOR );
		}
		rtlpriv->stats.rx_snr_db[rfpath] = pstatus->rx_snr[rfpath];
		rtlpriv->stats.rx_evm_dbm[rfpath] =
					pstatus->rx_mimo_evm_dbm[rfpath];
		rtlpriv->stats.rx_cfo_short[rfpath] =
					pstatus->cfo_short[rfpath];
		rtlpriv->stats.rx_cfo_tail[rfpath] = pstatus->cfo_tail[rfpath];
	}
}

static void rtl_update_rxsignalstatistics( struct ieee80211_hw *hw,
					  struct rtl_stats *pstatus )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	int weighting = 0;

	if ( rtlpriv->stats.recv_signal_power == 0 )
		rtlpriv->stats.recv_signal_power = pstatus->recvsignalpower;
	if ( pstatus->recvsignalpower > rtlpriv->stats.recv_signal_power )
		weighting = 5;
	else if ( pstatus->recvsignalpower < rtlpriv->stats.recv_signal_power )
		weighting = ( -5 );
	rtlpriv->stats.recv_signal_power = ( rtlpriv->stats.recv_signal_power *
		5 + pstatus->recvsignalpower + weighting ) / 6;
}

static void rtl_process_pwdb( struct ieee80211_hw *hw, struct rtl_stats *pstatus )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	struct rtl_sta_info *drv_priv = NULL;
	struct ieee80211_sta *sta = NULL;
	long undec_sm_pwdb;

	rcu_read_lock();
	if ( rtlpriv->mac80211.opmode != NL80211_IFTYPE_STATION )
		sta = rtl_find_sta( hw, pstatus->psaddr );

	/* adhoc or ap mode */
	if ( sta ) {
		drv_priv = ( struct rtl_sta_info * ) sta->drv_priv;
		undec_sm_pwdb = drv_priv->rssi_stat.undec_sm_pwdb;
	} else {
		undec_sm_pwdb = rtlpriv->dm.undec_sm_pwdb;
	}

	if ( undec_sm_pwdb < 0 )
		undec_sm_pwdb = pstatus->rx_pwdb_all;
	if ( pstatus->rx_pwdb_all > ( u32 ) undec_sm_pwdb ) {
		undec_sm_pwdb = ( ( ( undec_sm_pwdb ) *
		      ( RX_SMOOTH_FACTOR - 1 ) ) +
		     ( pstatus->rx_pwdb_all ) ) / ( RX_SMOOTH_FACTOR );
		undec_sm_pwdb = undec_sm_pwdb + 1;
	} else {
		undec_sm_pwdb = ( ( ( undec_sm_pwdb ) *
		      ( RX_SMOOTH_FACTOR - 1 ) ) +
		     ( pstatus->rx_pwdb_all ) ) / ( RX_SMOOTH_FACTOR );
	}

	if ( sta ) {
		drv_priv->rssi_stat.undec_sm_pwdb = undec_sm_pwdb;
	} else {
		rtlpriv->dm.undec_sm_pwdb = undec_sm_pwdb;
	}
	rcu_read_unlock();

	rtl_update_rxsignalstatistics( hw, pstatus );
}

static void rtl_process_ui_link_quality( struct ieee80211_hw *hw,
					struct rtl_stats *pstatus )
{
	struct rtl_priv *rtlpriv = rtl_priv( hw );
	u32 last_evm, n_stream, tmpval;

	if ( pstatus->signalquality == 0 )
		return;

	if ( rtlpriv->stats.ui_link_quality.total_num++ >=
	    PHY_LINKQUALITY_SLID_WIN_MAX ) {
		rtlpriv->stats.ui_link_quality.total_num =
		    PHY_LINKQUALITY_SLID_WIN_MAX;
		last_evm = rtlpriv->stats.ui_link_quality.elements[
			rtlpriv->stats.ui_link_quality.index];
		rtlpriv->stats.ui_link_quality.total_val -= last_evm;
	}
	rtlpriv->stats.ui_link_quality.total_val += pstatus->signalquality;
	rtlpriv->stats.ui_link_quality.elements[
		rtlpriv->stats.ui_link_quality.index++] =
							pstatus->signalquality;
	if ( rtlpriv->stats.ui_link_quality.index >=
	    PHY_LINKQUALITY_SLID_WIN_MAX )
		rtlpriv->stats.ui_link_quality.index = 0;
	tmpval = rtlpriv->stats.ui_link_quality.total_val /
	    rtlpriv->stats.ui_link_quality.total_num;
	rtlpriv->stats.signal_quality = tmpval;
	rtlpriv->stats.last_sigstrength_inpercent = tmpval;
	for ( n_stream = 0; n_stream < 2; n_stream++ ) {
		if ( pstatus->rx_mimo_sig_qual[n_stream] != -1 ) {
			if ( rtlpriv->stats.rx_evm_percentage[n_stream] == 0 ) {
				rtlpriv->stats.rx_evm_percentage[n_stream] =
				    pstatus->rx_mimo_sig_qual[n_stream];
			}
			rtlpriv->stats.rx_evm_percentage[n_stream] =
			    ( ( rtlpriv->stats.rx_evm_percentage[n_stream]
			      * ( RX_SMOOTH_FACTOR - 1 ) ) +
			     ( pstatus->rx_mimo_sig_qual[n_stream] * 1 ) ) /
			    ( RX_SMOOTH_FACTOR );
		}
	}
}

void rtl_process_phyinfo( struct ieee80211_hw *hw, u8 *buffer,
			 struct rtl_stats *pstatus )
{

	if ( !pstatus->packet_matchbssid )
		return;

	rtl_process_ui_rssi( hw, pstatus );
	rtl_process_pwdb( hw, pstatus );
	rtl_process_ui_link_quality( hw, pstatus );
}
EXPORT_SYMBOL( rtl_process_phyinfo );