use signal_strength to get noise from signal_power

Makefile

@@ -159,6 +159,9 @@ CONFIG_PLATFORM_NV_TK1_UBUNTU = n
 CONFIG_PLATFORM_RTL8197D = n
 CONFIG_PLATFORM_AML_S905 = n
 CONFIG_PLATFORM_ZTE_ZX296716 = n
+CONFIG_RTW_HOSTAPD_ACS = n 
+CONFIG_BACKGROUND_NOISE_MONITOR = n 
+CONFIG_RTW_DEBUG = n 
 ###############################################################
 
 CONFIG_DRVEXT_MODULE = n

core/rtw_recv.c

@@ -4040,6 +4040,7 @@ static sint fill_radiotap_hdr(_adapter *padapter, union recv_frame *precvframe,
 
 	/* channel flags */
 	tmp_16bit = 0;
+	s8 snr = 0;
 	if (pHalData->current_band_type == 0)
 		tmp_16bit |= cpu_to_le16(IEEE80211_CHAN_2GHZ);
 	else
@@ -4049,9 +4050,15 @@ static sint fill_radiotap_hdr(_adapter *padapter, union recv_frame *precvframe,
 		if (pattrib->data_rate < 4) {
 			/* CCK */
 			tmp_16bit |= cpu_to_le16(IEEE80211_CHAN_CCK);
+
+			// understand with value take when CCK
+			// snr = pattrib->phy_info.rx_snr[0];
 		} else {
 			/* OFDM */
 			tmp_16bit |= cpu_to_le16(IEEE80211_CHAN_OFDM);
+
+			// when is OFMD, take the first value of the array for snr
+			snr = pattrib->phy_info.rx_snr[0];
 		}
 	} else
 		tmp_16bit |= cpu_to_le16(IEEE80211_CHAN_DYN);
@@ -4061,27 +4068,23 @@ static sint fill_radiotap_hdr(_adapter *padapter, union recv_frame *precvframe,
 	/* dBm Antenna Signal */
 	rtap_hdr->it_present |= (1 << IEEE80211_RADIOTAP_DBM_ANTSIGNAL);
 	hdr_buf[rt_len] = pattrib->phy_info.recv_signal_power;
+
 	rt_len += 1;
 
 	/* dBm Antenna Noise */
 	rtap_hdr->it_present |= (1 << IEEE80211_RADIOTAP_DBM_ANTNOISE);
-
-	s16 avg_snr = 0;
-	int i;
-	for (i = 0; i < pHalData->NumTotalRFPath; i++) {
-		avg_snr += pattrib->phy_info.rx_snr[i];
+	if (snr == 0) {
+		hdr_buf[rt_len] = 0;
+	} else {
+		hdr_buf[rt_len] = pattrib->phy_info.recv_signal_power - (snr);	
 	}
 
-	// TODO understand how to manage the four values
-	hdr_buf[rt_len] = pattrib->phy_info.recv_signal_power - (s8)(avg_snr/4);
 	rt_len += 1;
 
-#if 0
 	/* Signal Quality */
 	rtap_hdr->it_present |= (1 << IEEE80211_RADIOTAP_LOCK_QUALITY);
 	hdr_buf[rt_len] = pattrib->phy_info.signal_quality;
 	rt_len += 1;
-#endif
 
 	/* Antenna */
 	//rtap_hdr->it_present |= (1 << IEEE80211_RADIOTAP_ANTENNA);