drivers/staging/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(s8 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
  39 u8 rtl_evm_db_to_percentage(s8 value)
  40 {
  41         s8 ret_val = clamp(-value, 0, 33) * 3;
  42
  43         if (ret_val == 99)
  44                 ret_val = 100;
  45
  46         return ret_val;
  47 }
  48
  49 static long rtl_translate_todbm(struct ieee80211_hw *hw,
  50                                 u8 signal_strength_index)
  51 {
  52         long signal_power;
  53
  54         signal_power = (long)((signal_strength_index + 1) >> 1);
  55         signal_power -= 95;
  56         return signal_power;
  57 }
  58
  59 long rtl_signal_scale_mapping(struct ieee80211_hw *hw, long currsig)
  60 {
  61         long retsig;
  62
  63         if (currsig >= 61 && currsig <= 100)
  64                 retsig = 90 + ((currsig - 60) / 4);
  65         else if (currsig >= 41 && currsig <= 60)
  66                 retsig = 78 + ((currsig - 40) / 2);
  67         else if (currsig >= 31 && currsig <= 40)
  68                 retsig = 66 + (currsig - 30);
  69         else if (currsig >= 21 && currsig <= 30)
  70                 retsig = 54 + (currsig - 20);
  71         else if (currsig >= 5 && currsig <= 20)
  72                 retsig = 42 + (((currsig - 5) * 2) / 3);
  73         else if (currsig == 4)
  74                 retsig = 36;
  75         else if (currsig == 3)
  76                 retsig = 27;
  77         else if (currsig == 2)
  78                 retsig = 18;
  79         else if (currsig == 1)
  80                 retsig = 9;
  81         else
  82                 retsig = currsig;
  83
  84         return retsig;
  85 }
  86
  87 static void rtl_process_ui_rssi(struct ieee80211_hw *hw,
  88                                 struct rtl_stats *pstatus)
  89 {
  90         struct rtl_priv *rtlpriv = rtl_priv(hw);
  91         struct rtl_phy *rtlphy = &rtlpriv->phy;
  92         u8 rfpath;
  93         u32 last_rssi, tmpval;
  94
  95         if (!pstatus->packet_toself && !pstatus->packet_beacon)
  96                 return;
  97
  98         rtlpriv->stats.pwdb_all_cnt += pstatus->rx_pwdb_all;
  99         rtlpriv->stats.rssi_calculate_cnt++;
 100
 101         if (rtlpriv->stats.ui_rssi.total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
 102                 rtlpriv->stats.ui_rssi.total_num = PHY_RSSI_SLID_WIN_MAX;
 103                 last_rssi = rtlpriv->stats.ui_rssi.elements[
 104                         rtlpriv->stats.ui_rssi.index];
 105                 rtlpriv->stats.ui_rssi.total_val -= last_rssi;
 106         }
 107         rtlpriv->stats.ui_rssi.total_val += pstatus->signalstrength;
 108         rtlpriv->stats.ui_rssi.elements[rtlpriv->stats.ui_rssi.index++] =
 109             pstatus->signalstrength;
 110         if (rtlpriv->stats.ui_rssi.index >= PHY_RSSI_SLID_WIN_MAX)
 111                 rtlpriv->stats.ui_rssi.index = 0;
 112         tmpval = rtlpriv->stats.ui_rssi.total_val /
 113                 rtlpriv->stats.ui_rssi.total_num;
 114         rtlpriv->stats.signal_strength = rtl_translate_todbm(hw, (u8)tmpval);
 115         pstatus->rssi = rtlpriv->stats.signal_strength;
 116
 117         if (pstatus->is_cck)
 118                 return;
 119
 120         for (rfpath = RF90_PATH_A; rfpath < rtlphy->num_total_rfpath;
 121              rfpath++) {
 122                 if (rtlpriv->stats.rx_rssi_percentage[rfpath] == 0) {
 123                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 124                             pstatus->rx_mimo_signalstrength[rfpath];
 125                 }
 126                 if (pstatus->rx_mimo_signalstrength[rfpath] >
 127                     rtlpriv->stats.rx_rssi_percentage[rfpath]) {
 128                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 129                             ((rtlpriv->stats.rx_rssi_percentage[rfpath] *
 130                               (RX_SMOOTH_FACTOR - 1)) +
 131                              (pstatus->rx_mimo_signalstrength[rfpath])) /
 132                             (RX_SMOOTH_FACTOR);
 133                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 134                             rtlpriv->stats.rx_rssi_percentage[rfpath] + 1;
 135                 } else {
 136                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 137                             ((rtlpriv->stats.rx_rssi_percentage[rfpath] *
 138                               (RX_SMOOTH_FACTOR - 1)) +
 139                              (pstatus->rx_mimo_signalstrength[rfpath])) /
 140                             (RX_SMOOTH_FACTOR);
 141                 }
 142                 rtlpriv->stats.rx_snr_db[rfpath] = pstatus->rx_snr[rfpath];
 143                 rtlpriv->stats.rx_evm_dbm[rfpath] =
 144                                         pstatus->rx_mimo_evm_dbm[rfpath];
 145                 rtlpriv->stats.rx_cfo_short[rfpath] =
 146                                         pstatus->cfo_short[rfpath];
 147                 rtlpriv->stats.rx_cfo_tail[rfpath] = pstatus->cfo_tail[rfpath];
 148         }
 149 }
 150
 151 static void rtl_update_rxsignalstatistics(struct ieee80211_hw *hw,
 152                                           struct rtl_stats *pstatus)
 153 {
 154         struct rtl_priv *rtlpriv = rtl_priv(hw);
 155         int weighting = 0;
 156
 157         if (rtlpriv->stats.recv_signal_power == 0)
 158                 rtlpriv->stats.recv_signal_power = pstatus->recvsignalpower;
 159         if (pstatus->recvsignalpower > rtlpriv->stats.recv_signal_power)
 160                 weighting = 5;
 161         else if (pstatus->recvsignalpower < rtlpriv->stats.recv_signal_power)
 162                 weighting = (-5);
 163         rtlpriv->stats.recv_signal_power = (rtlpriv->stats.recv_signal_power *
 164                 5 + pstatus->recvsignalpower + weighting) / 6;
 165 }
 166
 167 static void rtl_process_pwdb(struct ieee80211_hw *hw, struct rtl_stats *pstatus)
 168 {
 169         struct rtl_priv *rtlpriv = rtl_priv(hw);
 170         struct rtl_sta_info *drv_priv = NULL;
 171         struct ieee80211_sta *sta = NULL;
 172         long undec_sm_pwdb;
 173
 174         rcu_read_lock();
 175         if (rtlpriv->mac80211.opmode != NL80211_IFTYPE_STATION)
 176                 sta = rtl_find_sta(hw, pstatus->psaddr);
 177
 178         /* adhoc or ap mode */
 179         if (sta) {
 180                 drv_priv = (struct rtl_sta_info *)sta->drv_priv;
 181                 undec_sm_pwdb = drv_priv->rssi_stat.undec_sm_pwdb;
 182         } else {
 183                 undec_sm_pwdb = rtlpriv->dm.undec_sm_pwdb;
 184         }
 185
 186         if (undec_sm_pwdb < 0)
 187                 undec_sm_pwdb = pstatus->rx_pwdb_all;
 188         if (pstatus->rx_pwdb_all > (u32)undec_sm_pwdb) {
 189                 undec_sm_pwdb = (((undec_sm_pwdb) *
 190                       (RX_SMOOTH_FACTOR - 1)) +
 191                      (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
 192                 undec_sm_pwdb = undec_sm_pwdb + 1;
 193         } else {
 194                 undec_sm_pwdb = (((undec_sm_pwdb) *
 195                       (RX_SMOOTH_FACTOR - 1)) +
 196                      (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
 197         }
 198
 199         if (sta)
 200                 drv_priv->rssi_stat.undec_sm_pwdb = undec_sm_pwdb;
 201         else
 202                 rtlpriv->dm.undec_sm_pwdb = undec_sm_pwdb;
 203         rcu_read_unlock();
 204
 205         rtl_update_rxsignalstatistics(hw, pstatus);
 206 }
 207
 208 static void rtl_process_ui_link_quality(struct ieee80211_hw *hw,
 209                                         struct rtl_stats *pstatus)
 210 {
 211         struct rtl_priv *rtlpriv = rtl_priv(hw);
 212         u32 last_evm, n_stream, tmpval;
 213
 214         if (pstatus->signalquality == 0)
 215                 return;
 216
 217         if (rtlpriv->stats.ui_link_quality.total_num++ >=
 218             PHY_LINKQUALITY_SLID_WIN_MAX) {
 219                 rtlpriv->stats.ui_link_quality.total_num =
 220                     PHY_LINKQUALITY_SLID_WIN_MAX;
 221                 last_evm = rtlpriv->stats.ui_link_quality.elements[
 222                         rtlpriv->stats.ui_link_quality.index];
 223                 rtlpriv->stats.ui_link_quality.total_val -= last_evm;
 224         }
 225         rtlpriv->stats.ui_link_quality.total_val += pstatus->signalquality;
 226         rtlpriv->stats.ui_link_quality.elements[
 227                 rtlpriv->stats.ui_link_quality.index++] =
 228                                                         pstatus->signalquality;
 229         if (rtlpriv->stats.ui_link_quality.index >=
 230             PHY_LINKQUALITY_SLID_WIN_MAX)
 231                 rtlpriv->stats.ui_link_quality.index = 0;
 232         tmpval = rtlpriv->stats.ui_link_quality.total_val /
 233             rtlpriv->stats.ui_link_quality.total_num;
 234         rtlpriv->stats.signal_quality = tmpval;
 235         rtlpriv->stats.last_sigstrength_inpercent = tmpval;
 236         for (n_stream = 0; n_stream < 2; n_stream++) {
 237                 if (pstatus->rx_mimo_sig_qual[n_stream] != -1) {
 238                         if (rtlpriv->stats.rx_evm_percentage[n_stream] == 0) {
 239                                 rtlpriv->stats.rx_evm_percentage[n_stream] =
 240                                     pstatus->rx_mimo_sig_qual[n_stream];
 241                         }
 242                         rtlpriv->stats.rx_evm_percentage[n_stream] =
 243                             ((rtlpriv->stats.rx_evm_percentage[n_stream]
 244                               * (RX_SMOOTH_FACTOR - 1)) +
 245                              (pstatus->rx_mimo_sig_qual[n_stream] * 1)) /
 246                             (RX_SMOOTH_FACTOR);
 247                 }
 248         }
 249 }
 250
 251 void rtl_process_phyinfo(struct ieee80211_hw *hw, u8 *buffer,
 252                          struct rtl_stats *pstatus)
 253 {
 254         if (!pstatus->packet_matchbssid)
 255                 return;
 256
 257         rtl_process_ui_rssi(hw, pstatus);
 258         rtl_process_pwdb(hw, pstatus);
 259         rtl_process_ui_link_quality(hw, pstatus);
 260 }