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