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 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);