1 /****************************************************************************** 2 * 3 * Copyright(c) 2009-2012 Realtek Corporation. 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of version 2 of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * The full GNU General Public License is included in this distribution in the 15 * file called LICENSE. 16 * 17 * Contact Information: 18 * wlanfae <wlanfae@realtek.com> 19 * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park, 20 * Hsinchu 300, Taiwan. 21 * 22 * Larry Finger <Larry.Finger@lwfinger.net> 23 * 24 *****************************************************************************/ 25 #include "wifi.h" 26 #include "stats.h" 27 #include <linux/export.h> 28 29 u8 rtl_query_rxpwrpercentage(char antpower) 30 { 31 if ((antpower <= -100) || (antpower >= 20)) 32 return 0; 33 else if (antpower >= 0) 34 return 100; 35 else 36 return 100 + antpower; 37 } 38 EXPORT_SYMBOL(rtl_query_rxpwrpercentage); 39 40 u8 rtl_evm_db_to_percentage(char value) 41 { 42 char ret_val = clamp(-value, 0, 33) * 3; 43 44 if (ret_val == 99) 45 ret_val = 100; 46 47 return ret_val; 48 } 49 EXPORT_SYMBOL(rtl_evm_db_to_percentage); 50 51 static long rtl_translate_todbm(struct ieee80211_hw *hw, 52 u8 signal_strength_index) 53 { 54 long signal_power; 55 56 signal_power = (long)((signal_strength_index + 1) >> 1); 57 signal_power -= 95; 58 return signal_power; 59 } 60 61 long rtl_signal_scale_mapping(struct ieee80211_hw *hw, long currsig) 62 { 63 long retsig; 64 65 if (currsig >= 61 && currsig <= 100) 66 retsig = 90 + ((currsig - 60) / 4); 67 else if (currsig >= 41 && currsig <= 60) 68 retsig = 78 + ((currsig - 40) / 2); 69 else if (currsig >= 31 && currsig <= 40) 70 retsig = 66 + (currsig - 30); 71 else if (currsig >= 21 && currsig <= 30) 72 retsig = 54 + (currsig - 20); 73 else if (currsig >= 5 && currsig <= 20) 74 retsig = 42 + (((currsig - 5) * 2) / 3); 75 else if (currsig == 4) 76 retsig = 36; 77 else if (currsig == 3) 78 retsig = 27; 79 else if (currsig == 2) 80 retsig = 18; 81 else if (currsig == 1) 82 retsig = 9; 83 else 84 retsig = currsig; 85 86 return retsig; 87 } 88 EXPORT_SYMBOL(rtl_signal_scale_mapping); 89 90 static void rtl_process_ui_rssi(struct ieee80211_hw *hw, 91 struct rtl_stats *pstatus) 92 { 93 struct rtl_priv *rtlpriv = rtl_priv(hw); 94 struct rtl_phy *rtlphy = &(rtlpriv->phy); 95 u8 rfpath; 96 u32 last_rssi, tmpval; 97 98 if (!pstatus->packet_toself && !pstatus->packet_beacon) 99 return; 100 101 rtlpriv->stats.pwdb_all_cnt += pstatus->rx_pwdb_all; 102 rtlpriv->stats.rssi_calculate_cnt++; 103 104 if (rtlpriv->stats.ui_rssi.total_num++ >= PHY_RSSI_SLID_WIN_MAX) { 105 rtlpriv->stats.ui_rssi.total_num = PHY_RSSI_SLID_WIN_MAX; 106 last_rssi = rtlpriv->stats.ui_rssi.elements[ 107 rtlpriv->stats.ui_rssi.index]; 108 rtlpriv->stats.ui_rssi.total_val -= last_rssi; 109 } 110 rtlpriv->stats.ui_rssi.total_val += pstatus->signalstrength; 111 rtlpriv->stats.ui_rssi.elements[rtlpriv->stats.ui_rssi.index++] = 112 pstatus->signalstrength; 113 if (rtlpriv->stats.ui_rssi.index >= PHY_RSSI_SLID_WIN_MAX) 114 rtlpriv->stats.ui_rssi.index = 0; 115 tmpval = rtlpriv->stats.ui_rssi.total_val / 116 rtlpriv->stats.ui_rssi.total_num; 117 rtlpriv->stats.signal_strength = rtl_translate_todbm(hw, 118 (u8) tmpval); 119 pstatus->rssi = rtlpriv->stats.signal_strength; 120 121 if (pstatus->is_cck) 122 return; 123 124 for (rfpath = RF90_PATH_A; rfpath < rtlphy->num_total_rfpath; 125 rfpath++) { 126 if (rtlpriv->stats.rx_rssi_percentage[rfpath] == 0) { 127 rtlpriv->stats.rx_rssi_percentage[rfpath] = 128 pstatus->rx_mimo_signalstrength[rfpath]; 129 130 } 131 if (pstatus->rx_mimo_signalstrength[rfpath] > 132 rtlpriv->stats.rx_rssi_percentage[rfpath]) { 133 rtlpriv->stats.rx_rssi_percentage[rfpath] = 134 ((rtlpriv->stats.rx_rssi_percentage[rfpath] * 135 (RX_SMOOTH_FACTOR - 1)) + 136 (pstatus->rx_mimo_signalstrength[rfpath])) / 137 (RX_SMOOTH_FACTOR); 138 rtlpriv->stats.rx_rssi_percentage[rfpath] = 139 rtlpriv->stats.rx_rssi_percentage[rfpath] + 1; 140 } else { 141 rtlpriv->stats.rx_rssi_percentage[rfpath] = 142 ((rtlpriv->stats.rx_rssi_percentage[rfpath] * 143 (RX_SMOOTH_FACTOR - 1)) + 144 (pstatus->rx_mimo_signalstrength[rfpath])) / 145 (RX_SMOOTH_FACTOR); 146 } 147 rtlpriv->stats.rx_snr_db[rfpath] = pstatus->rx_snr[rfpath]; 148 rtlpriv->stats.rx_evm_dbm[rfpath] = 149 pstatus->rx_mimo_evm_dbm[rfpath]; 150 rtlpriv->stats.rx_cfo_short[rfpath] = 151 pstatus->cfo_short[rfpath]; 152 rtlpriv->stats.rx_cfo_tail[rfpath] = pstatus->cfo_tail[rfpath]; 153 } 154 } 155 156 static void rtl_update_rxsignalstatistics(struct ieee80211_hw *hw, 157 struct rtl_stats *pstatus) 158 { 159 struct rtl_priv *rtlpriv = rtl_priv(hw); 160 int weighting = 0; 161 162 if (rtlpriv->stats.recv_signal_power == 0) 163 rtlpriv->stats.recv_signal_power = pstatus->recvsignalpower; 164 if (pstatus->recvsignalpower > rtlpriv->stats.recv_signal_power) 165 weighting = 5; 166 else if (pstatus->recvsignalpower < rtlpriv->stats.recv_signal_power) 167 weighting = (-5); 168 rtlpriv->stats.recv_signal_power = (rtlpriv->stats.recv_signal_power * 169 5 + pstatus->recvsignalpower + weighting) / 6; 170 } 171 172 static void rtl_process_pwdb(struct ieee80211_hw *hw, struct rtl_stats *pstatus) 173 { 174 struct rtl_priv *rtlpriv = rtl_priv(hw); 175 struct rtl_sta_info *drv_priv = NULL; 176 struct ieee80211_sta *sta = NULL; 177 long undec_sm_pwdb; 178 179 rcu_read_lock(); 180 if (rtlpriv->mac80211.opmode != NL80211_IFTYPE_STATION) 181 sta = rtl_find_sta(hw, pstatus->psaddr); 182 183 /* adhoc or ap mode */ 184 if (sta) { 185 drv_priv = (struct rtl_sta_info *) sta->drv_priv; 186 undec_sm_pwdb = drv_priv->rssi_stat.undec_sm_pwdb; 187 } else { 188 undec_sm_pwdb = rtlpriv->dm.undec_sm_pwdb; 189 } 190 191 if (undec_sm_pwdb < 0) 192 undec_sm_pwdb = pstatus->rx_pwdb_all; 193 if (pstatus->rx_pwdb_all > (u32) undec_sm_pwdb) { 194 undec_sm_pwdb = (((undec_sm_pwdb) * 195 (RX_SMOOTH_FACTOR - 1)) + 196 (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR); 197 undec_sm_pwdb = undec_sm_pwdb + 1; 198 } else { 199 undec_sm_pwdb = (((undec_sm_pwdb) * 200 (RX_SMOOTH_FACTOR - 1)) + 201 (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR); 202 } 203 204 if (sta) { 205 drv_priv->rssi_stat.undec_sm_pwdb = undec_sm_pwdb; 206 } else { 207 rtlpriv->dm.undec_sm_pwdb = undec_sm_pwdb; 208 } 209 rcu_read_unlock(); 210 211 rtl_update_rxsignalstatistics(hw, pstatus); 212 } 213 214 static void rtl_process_ui_link_quality(struct ieee80211_hw *hw, 215 struct rtl_stats *pstatus) 216 { 217 struct rtl_priv *rtlpriv = rtl_priv(hw); 218 u32 last_evm, n_stream, tmpval; 219 220 if (pstatus->signalquality == 0) 221 return; 222 223 if (rtlpriv->stats.ui_link_quality.total_num++ >= 224 PHY_LINKQUALITY_SLID_WIN_MAX) { 225 rtlpriv->stats.ui_link_quality.total_num = 226 PHY_LINKQUALITY_SLID_WIN_MAX; 227 last_evm = rtlpriv->stats.ui_link_quality.elements[ 228 rtlpriv->stats.ui_link_quality.index]; 229 rtlpriv->stats.ui_link_quality.total_val -= last_evm; 230 } 231 rtlpriv->stats.ui_link_quality.total_val += pstatus->signalquality; 232 rtlpriv->stats.ui_link_quality.elements[ 233 rtlpriv->stats.ui_link_quality.index++] = 234 pstatus->signalquality; 235 if (rtlpriv->stats.ui_link_quality.index >= 236 PHY_LINKQUALITY_SLID_WIN_MAX) 237 rtlpriv->stats.ui_link_quality.index = 0; 238 tmpval = rtlpriv->stats.ui_link_quality.total_val / 239 rtlpriv->stats.ui_link_quality.total_num; 240 rtlpriv->stats.signal_quality = tmpval; 241 rtlpriv->stats.last_sigstrength_inpercent = tmpval; 242 for (n_stream = 0; n_stream < 2; n_stream++) { 243 if (pstatus->rx_mimo_sig_qual[n_stream] != -1) { 244 if (rtlpriv->stats.rx_evm_percentage[n_stream] == 0) { 245 rtlpriv->stats.rx_evm_percentage[n_stream] = 246 pstatus->rx_mimo_sig_qual[n_stream]; 247 } 248 rtlpriv->stats.rx_evm_percentage[n_stream] = 249 ((rtlpriv->stats.rx_evm_percentage[n_stream] 250 * (RX_SMOOTH_FACTOR - 1)) + 251 (pstatus->rx_mimo_sig_qual[n_stream] * 1)) / 252 (RX_SMOOTH_FACTOR); 253 } 254 } 255 } 256 257 void rtl_process_phyinfo(struct ieee80211_hw *hw, u8 *buffer, 258 struct rtl_stats *pstatus) 259 { 260 261 if (!pstatus->packet_matchbssid) 262 return; 263 264 rtl_process_ui_rssi(hw, pstatus); 265 rtl_process_pwdb(hw, pstatus); 266 rtl_process_ui_link_quality(hw, pstatus); 267 } 268 EXPORT_SYMBOL(rtl_process_phyinfo); 269