drivers/net/wireless/rtlwifi/stats.c

   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;
  43         ret_val = value;
  44
  45         if (ret_val >= 0)
  46                 ret_val = 0;
  47         if (ret_val <= -33)
  48                 ret_val = -33;
  49         ret_val = 0 - ret_val;
  50         ret_val *= 3;
  51         if (ret_val == 99)
  52                 ret_val = 100;
  53
  54         return ret_val;
  55 }
  56 EXPORT_SYMBOL(rtl_evm_db_to_percentage);
  57
  58 u8 rtl_evm_dbm_jaguar(char value)
  59 {
  60         char ret_val = value;
  61
  62         /* -33dB~0dB to 33dB ~ 0dB*/
  63         if (ret_val == -128)
  64                 ret_val = 127;
  65         else if (ret_val < 0)
  66                 ret_val = 0 - ret_val;
  67
  68         ret_val  = ret_val >> 1;
  69         return ret_val;
  70 }
  71 EXPORT_SYMBOL(rtl_evm_dbm_jaguar);
  72
  73 static long rtl_translate_todbm(struct ieee80211_hw *hw,
  74                          u8 signal_strength_index)
  75 {
  76         long signal_power;
  77
  78         signal_power = (long)((signal_strength_index + 1) >> 1);
  79         signal_power -= 95;
  80         return signal_power;
  81 }
  82
  83 long rtl_signal_scale_mapping(struct ieee80211_hw *hw, long currsig)
  84 {
  85         long retsig;
  86
  87         if (currsig >= 61 && currsig <= 100)
  88                 retsig = 90 + ((currsig - 60) / 4);
  89         else if (currsig >= 41 && currsig <= 60)
  90                 retsig = 78 + ((currsig - 40) / 2);
  91         else if (currsig >= 31 && currsig <= 40)
  92                 retsig = 66 + (currsig - 30);
  93         else if (currsig >= 21 && currsig <= 30)
  94                 retsig = 54 + (currsig - 20);
  95         else if (currsig >= 5 && currsig <= 20)
  96                 retsig = 42 + (((currsig - 5) * 2) / 3);
  97         else if (currsig == 4)
  98                 retsig = 36;
  99         else if (currsig == 3)
 100                 retsig = 27;
 101         else if (currsig == 2)
 102                 retsig = 18;
 103         else if (currsig == 1)
 104                 retsig = 9;
 105         else
 106                 retsig = currsig;
 107
 108         return retsig;
 109 }
 110 EXPORT_SYMBOL(rtl_signal_scale_mapping);
 111
 112 static void rtl_process_ui_rssi(struct ieee80211_hw *hw,
 113                                 struct rtl_stats *pstatus)
 114 {
 115         struct rtl_priv *rtlpriv = rtl_priv(hw);
 116         struct rtl_phy *rtlphy = &(rtlpriv->phy);
 117         u8 rfpath;
 118         u32 last_rssi, tmpval;
 119
 120         if (!pstatus->packet_toself && !pstatus->packet_beacon)
 121                 return;
 122
 123         rtlpriv->stats.pwdb_all_cnt += pstatus->rx_pwdb_all;
 124         rtlpriv->stats.rssi_calculate_cnt++;
 125
 126         if (rtlpriv->stats.ui_rssi.total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
 127                 rtlpriv->stats.ui_rssi.total_num = PHY_RSSI_SLID_WIN_MAX;
 128                 last_rssi = rtlpriv->stats.ui_rssi.elements[
 129                         rtlpriv->stats.ui_rssi.index];
 130                 rtlpriv->stats.ui_rssi.total_val -= last_rssi;
 131         }
 132         rtlpriv->stats.ui_rssi.total_val += pstatus->signalstrength;
 133         rtlpriv->stats.ui_rssi.elements[rtlpriv->stats.ui_rssi.index++] =
 134             pstatus->signalstrength;
 135         if (rtlpriv->stats.ui_rssi.index >= PHY_RSSI_SLID_WIN_MAX)
 136                 rtlpriv->stats.ui_rssi.index = 0;
 137         tmpval = rtlpriv->stats.ui_rssi.total_val /
 138                 rtlpriv->stats.ui_rssi.total_num;
 139         rtlpriv->stats.signal_strength = rtl_translate_todbm(hw,
 140                 (u8) tmpval);
 141         pstatus->rssi = rtlpriv->stats.signal_strength;
 142
 143         if (pstatus->is_cck)
 144                 return;
 145
 146         for (rfpath = RF90_PATH_A; rfpath < rtlphy->num_total_rfpath;
 147              rfpath++) {
 148                 if (rtlpriv->stats.rx_rssi_percentage[rfpath] == 0) {
 149                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 150                             pstatus->rx_mimo_signalstrength[rfpath];
 151
 152                 }
 153                 if (pstatus->rx_mimo_signalstrength[rfpath] >
 154                     rtlpriv->stats.rx_rssi_percentage[rfpath]) {
 155                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 156                             ((rtlpriv->stats.rx_rssi_percentage[rfpath] *
 157                               (RX_SMOOTH_FACTOR - 1)) +
 158                              (pstatus->rx_mimo_signalstrength[rfpath])) /
 159                             (RX_SMOOTH_FACTOR);
 160                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 161                             rtlpriv->stats.rx_rssi_percentage[rfpath] + 1;
 162                 } else {
 163                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 164                             ((rtlpriv->stats.rx_rssi_percentage[rfpath] *
 165                               (RX_SMOOTH_FACTOR - 1)) +
 166                              (pstatus->rx_mimo_signalstrength[rfpath])) /
 167                             (RX_SMOOTH_FACTOR);
 168                 }
 169                 rtlpriv->stats.rx_snr_db[rfpath] = pstatus->rx_snr[rfpath];
 170                 rtlpriv->stats.rx_evm_dbm[rfpath] =
 171                                         pstatus->rx_mimo_evm_dbm[rfpath];
 172                 rtlpriv->stats.rx_cfo_short[rfpath] =
 173                                         pstatus->cfo_short[rfpath];
 174                 rtlpriv->stats.rx_cfo_tail[rfpath] = pstatus->cfo_tail[rfpath];
 175         }
 176 }
 177
 178 static void rtl_update_rxsignalstatistics(struct ieee80211_hw *hw,
 179                                           struct rtl_stats *pstatus)
 180 {
 181         struct rtl_priv *rtlpriv = rtl_priv(hw);
 182         int weighting = 0;
 183
 184         if (rtlpriv->stats.recv_signal_power == 0)
 185                 rtlpriv->stats.recv_signal_power = pstatus->recvsignalpower;
 186         if (pstatus->recvsignalpower > rtlpriv->stats.recv_signal_power)
 187                 weighting = 5;
 188         else if (pstatus->recvsignalpower < rtlpriv->stats.recv_signal_power)
 189                 weighting = (-5);
 190         rtlpriv->stats.recv_signal_power = (rtlpriv->stats.recv_signal_power *
 191                 5 + pstatus->recvsignalpower + weighting) / 6;
 192 }
 193
 194 static void rtl_process_pwdb(struct ieee80211_hw *hw, struct rtl_stats *pstatus)
 195 {
 196         struct rtl_priv *rtlpriv = rtl_priv(hw);
 197         struct rtl_sta_info *drv_priv = NULL;
 198         struct ieee80211_sta *sta = NULL;
 199         long undec_sm_pwdb;
 200
 201         rcu_read_lock();
 202         if (rtlpriv->mac80211.opmode != NL80211_IFTYPE_STATION)
 203                 sta = rtl_find_sta(hw, pstatus->psaddr);
 204
 205         /* adhoc or ap mode */
 206         if (sta) {
 207                 drv_priv = (struct rtl_sta_info *) sta->drv_priv;
 208                 undec_sm_pwdb = drv_priv->rssi_stat.undec_sm_pwdb;
 209         } else {
 210                 undec_sm_pwdb = rtlpriv->dm.undec_sm_pwdb;
 211         }
 212
 213         if (undec_sm_pwdb < 0)
 214                 undec_sm_pwdb = pstatus->rx_pwdb_all;
 215         if (pstatus->rx_pwdb_all > (u32) undec_sm_pwdb) {
 216                 undec_sm_pwdb = (((undec_sm_pwdb) *
 217                       (RX_SMOOTH_FACTOR - 1)) +
 218                      (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
 219                 undec_sm_pwdb = undec_sm_pwdb + 1;
 220         } else {
 221                 undec_sm_pwdb = (((undec_sm_pwdb) *
 222                       (RX_SMOOTH_FACTOR - 1)) +
 223                      (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
 224         }
 225
 226         if (sta) {
 227                 drv_priv->rssi_stat.undec_sm_pwdb = undec_sm_pwdb;
 228         } else {
 229                 rtlpriv->dm.undec_sm_pwdb = undec_sm_pwdb;
 230         }
 231         rcu_read_unlock();
 232
 233         rtl_update_rxsignalstatistics(hw, pstatus);
 234 }
 235
 236 static void rtl_process_ui_link_quality(struct ieee80211_hw *hw,
 237                                         struct rtl_stats *pstatus)
 238 {
 239         struct rtl_priv *rtlpriv = rtl_priv(hw);
 240         u32 last_evm, n_stream, tmpval;
 241
 242         if (pstatus->signalquality == 0)
 243                 return;
 244
 245         if (rtlpriv->stats.ui_link_quality.total_num++ >=
 246             PHY_LINKQUALITY_SLID_WIN_MAX) {
 247                 rtlpriv->stats.ui_link_quality.total_num =
 248                     PHY_LINKQUALITY_SLID_WIN_MAX;
 249                 last_evm = rtlpriv->stats.ui_link_quality.elements[
 250                         rtlpriv->stats.ui_link_quality.index];
 251                 rtlpriv->stats.ui_link_quality.total_val -= last_evm;
 252         }
 253         rtlpriv->stats.ui_link_quality.total_val += pstatus->signalquality;
 254         rtlpriv->stats.ui_link_quality.elements[
 255                 rtlpriv->stats.ui_link_quality.index++] =
 256                                                         pstatus->signalquality;
 257         if (rtlpriv->stats.ui_link_quality.index >=
 258             PHY_LINKQUALITY_SLID_WIN_MAX)
 259                 rtlpriv->stats.ui_link_quality.index = 0;
 260         tmpval = rtlpriv->stats.ui_link_quality.total_val /
 261             rtlpriv->stats.ui_link_quality.total_num;
 262         rtlpriv->stats.signal_quality = tmpval;
 263         rtlpriv->stats.last_sigstrength_inpercent = tmpval;
 264         for (n_stream = 0; n_stream < 2; n_stream++) {
 265                 if (pstatus->rx_mimo_sig_qual[n_stream] != -1) {
 266                         if (rtlpriv->stats.rx_evm_percentage[n_stream] == 0) {
 267                                 rtlpriv->stats.rx_evm_percentage[n_stream] =
 268                                     pstatus->rx_mimo_sig_qual[n_stream];
 269                         }
 270                         rtlpriv->stats.rx_evm_percentage[n_stream] =
 271                             ((rtlpriv->stats.rx_evm_percentage[n_stream]
 272                               * (RX_SMOOTH_FACTOR - 1)) +
 273                              (pstatus->rx_mimo_sig_qual[n_stream] * 1)) /
 274                             (RX_SMOOTH_FACTOR);
 275                 }
 276         }
 277 }
 278
 279 void rtl_process_phyinfo(struct ieee80211_hw *hw, u8 *buffer,
 280                          struct rtl_stats *pstatus)
 281 {
 282
 283         if (!pstatus->packet_matchbssid)
 284                 return;
 285
 286         rtl_process_ui_rssi(hw, pstatus);
 287         rtl_process_pwdb(hw, pstatus);
 288         rtl_process_ui_link_quality(hw, pstatus);
 289 }
 290 EXPORT_SYMBOL(rtl_process_phyinfo);