drivers/staging/rtl8821ae/stats.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2009-2010  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  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  17  *
  18  * The full GNU General Public License is included in this distribution in the
  19  * file called LICENSE.
  20  *
  21  * Contact Information:
  22  * wlanfae <wlanfae@realtek.com>
  23  * Realtek Corporation, No. 2, Innovation Road II, Hsinchu Science Park,
  24  * Hsinchu 300, Taiwan.
  25  *
  26  * Larry Finger <Larry.Finger@lwfinger.net>
  27  *
  28  *****************************************************************************/
  29 #include "wifi.h"
  30 #include "stats.h"
  31 #include <linux/export.h>
  32
  33 u8 rtl_query_rxpwrpercentage(char antpower)
  34 {
  35         if ((antpower <= -100) || (antpower >= 20))
  36                 return 0;
  37         else if (antpower >= 0)
  38                 return 100;
  39         else
  40                 return (100 + antpower);
  41 }
  42 //EXPORT_SYMBOL(rtl_query_rxpwrpercentage);
  43
  44 u8 rtl_evm_db_to_percentage(char value)
  45 {
  46         char ret_val;
  47         ret_val = value;
  48
  49         if (ret_val >= 0)
  50                 ret_val = 0;
  51         if (ret_val <= -33)
  52                 ret_val = -33;
  53         ret_val = 0 - ret_val;
  54         ret_val *= 3;
  55         if (ret_val == 99)
  56                 ret_val = 100;
  57
  58         return ret_val;
  59 }
  60 //EXPORT_SYMBOL(rtl_evm_db_to_percentage);
  61
  62 long rtl_translate_todbm(struct ieee80211_hw *hw,
  63                          u8 signal_strength_index)
  64 {
  65         long signal_power;
  66
  67         signal_power = (long)((signal_strength_index + 1) >> 1);
  68         signal_power -= 95;
  69         return signal_power;
  70 }
  71
  72 long rtl_signal_scale_mapping(struct ieee80211_hw *hw, long currsig)
  73 {
  74         long retsig;
  75
  76         if (currsig >= 61 && currsig <= 100)
  77                 retsig = 90 + ((currsig - 60) / 4);
  78         else if (currsig >= 41 && currsig <= 60)
  79                 retsig = 78 + ((currsig - 40) / 2);
  80         else if (currsig >= 31 && currsig <= 40)
  81                 retsig = 66 + (currsig - 30);
  82         else if (currsig >= 21 && currsig <= 30)
  83                 retsig = 54 + (currsig - 20);
  84         else if (currsig >= 5 && currsig <= 20)
  85                 retsig = 42 + (((currsig - 5) * 2) / 3);
  86         else if (currsig == 4)
  87                 retsig = 36;
  88         else if (currsig == 3)
  89                 retsig = 27;
  90         else if (currsig == 2)
  91                 retsig = 18;
  92         else if (currsig == 1)
  93                 retsig = 9;
  94         else
  95                 retsig = currsig;
  96
  97         return retsig;
  98 }
  99 //EXPORT_SYMBOL(rtl_signal_scale_mapping);
 100
 101 void rtl_process_ui_rssi(struct ieee80211_hw *hw, struct rtl_stats *pstatus)
 102 {
 103         struct rtl_priv *rtlpriv = rtl_priv(hw);
 104         struct rtl_phy *rtlphy = &(rtlpriv->phy);
 105         u8 rfpath;
 106         u32 last_rssi, tmpval;
 107
 108         if (!pstatus->b_packet_toself && !pstatus->b_packet_beacon)
 109                 return;
 110
 111         rtlpriv->stats.pwdb_all_cnt += pstatus->rx_pwdb_all;
 112         rtlpriv->stats.rssi_calculate_cnt++;
 113
 114         if (rtlpriv->stats.ui_rssi.total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
 115                 rtlpriv->stats.ui_rssi.total_num = PHY_RSSI_SLID_WIN_MAX;
 116                 last_rssi = rtlpriv->stats.ui_rssi.elements[
 117                         rtlpriv->stats.ui_rssi.index];
 118                 rtlpriv->stats.ui_rssi.total_val -= last_rssi;
 119         }
 120         rtlpriv->stats.ui_rssi.total_val += pstatus->signalstrength;
 121         rtlpriv->stats.ui_rssi.elements[rtlpriv->stats.ui_rssi.index++] =
 122             pstatus->signalstrength;
 123         if (rtlpriv->stats.ui_rssi.index >= PHY_RSSI_SLID_WIN_MAX)
 124                 rtlpriv->stats.ui_rssi.index = 0;
 125         tmpval = rtlpriv->stats.ui_rssi.total_val /
 126                 rtlpriv->stats.ui_rssi.total_num;
 127         rtlpriv->stats.signal_strength = rtl_translate_todbm(hw,
 128                 (u8) tmpval);
 129         pstatus->rssi = rtlpriv->stats.signal_strength;
 130
 131         if (pstatus->b_is_cck)
 132                 return;
 133
 134         for (rfpath = RF90_PATH_A; rfpath < rtlphy->num_total_rfpath;
 135              rfpath++) {
 136                 if (rtlpriv->stats.rx_rssi_percentage[rfpath] == 0) {
 137                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 138                             pstatus->rx_mimo_signalstrength[rfpath];
 139
 140                 }
 141                 if (pstatus->rx_mimo_signalstrength[rfpath] >
 142                     rtlpriv->stats.rx_rssi_percentage[rfpath]) {
 143                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 144                             ((rtlpriv->stats.rx_rssi_percentage[rfpath] *
 145                               (RX_SMOOTH_FACTOR - 1)) +
 146                              (pstatus->rx_mimo_signalstrength[rfpath])) /
 147                             (RX_SMOOTH_FACTOR);
 148                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 149                             rtlpriv->stats.rx_rssi_percentage[rfpath] + 1;
 150                 } else {
 151                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 152                             ((rtlpriv->stats.rx_rssi_percentage[rfpath] *
 153                               (RX_SMOOTH_FACTOR - 1)) +
 154                              (pstatus->rx_mimo_signalstrength[rfpath])) /
 155                             (RX_SMOOTH_FACTOR);
 156                 }
 157                 rtlpriv->stats.rx_snr_db[rfpath] = pstatus->rx_snr[rfpath];
 158                 rtlpriv->stats.rx_evm_dbm[rfpath] =
 159                                         pstatus->rx_mimo_evm_dbm[rfpath];
 160                 rtlpriv->stats.rx_cfo_short[rfpath] =
 161                                         pstatus->cfo_short[rfpath];
 162                 rtlpriv->stats.rx_cfo_tail[rfpath] = pstatus->cfo_tail[rfpath];
 163         }
 164 }
 165
 166 static void rtl_update_rxsignalstatistics(struct ieee80211_hw *hw,
 167                                           struct rtl_stats *pstatus)
 168 {
 169         struct rtl_priv *rtlpriv = rtl_priv(hw);
 170         int weighting = 0;
 171
 172         if (rtlpriv->stats.recv_signal_power == 0)
 173                 rtlpriv->stats.recv_signal_power = pstatus->recvsignalpower;
 174         if (pstatus->recvsignalpower > rtlpriv->stats.recv_signal_power)
 175                 weighting = 5;
 176         else if (pstatus->recvsignalpower < rtlpriv->stats.recv_signal_power)
 177                 weighting = (-5);
 178         rtlpriv->stats.recv_signal_power = (rtlpriv->stats.recv_signal_power *
 179                 5 + pstatus->recvsignalpower + weighting) / 6;
 180 }
 181
 182 static void rtl_process_pwdb(struct ieee80211_hw *hw, struct rtl_stats *pstatus)
 183 {
 184         struct rtl_priv *rtlpriv = rtl_priv(hw);
 185         struct rtl_sta_info *drv_priv = NULL;
 186         struct ieee80211_sta *sta = NULL;
 187         long undecorated_smoothed_pwdb;
 188
 189         rcu_read_lock();
 190         if (rtlpriv->mac80211.opmode != NL80211_IFTYPE_STATION)
 191                 sta = rtl_find_sta(hw, pstatus->psaddr);
 192
 193         /* adhoc or ap mode */
 194         if (sta) {
 195                 drv_priv = (struct rtl_sta_info *) sta->drv_priv;
 196                 undecorated_smoothed_pwdb =
 197                         drv_priv->rssi_stat.undecorated_smoothed_pwdb;
 198         } else {
 199                 undecorated_smoothed_pwdb =
 200                         rtlpriv->dm.undecorated_smoothed_pwdb;
 201         }
 202
 203         if (undecorated_smoothed_pwdb < 0)
 204                 undecorated_smoothed_pwdb = pstatus->rx_pwdb_all;
 205         if (pstatus->rx_pwdb_all > (u32) undecorated_smoothed_pwdb) {
 206                 undecorated_smoothed_pwdb = (((undecorated_smoothed_pwdb) *
 207                       (RX_SMOOTH_FACTOR - 1)) +
 208                      (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
 209                 undecorated_smoothed_pwdb = undecorated_smoothed_pwdb + 1;
 210         } else {
 211                 undecorated_smoothed_pwdb = (((undecorated_smoothed_pwdb) *
 212                       (RX_SMOOTH_FACTOR - 1)) +
 213                      (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
 214         }
 215
 216         if(sta) {
 217                 drv_priv->rssi_stat.undecorated_smoothed_pwdb =
 218                         undecorated_smoothed_pwdb;
 219         } else {
 220                 rtlpriv->dm.undecorated_smoothed_pwdb = undecorated_smoothed_pwdb;
 221         }
 222         rcu_read_unlock();
 223
 224         rtl_update_rxsignalstatistics(hw, pstatus);
 225 }
 226
 227 static void rtl_process_ui_link_quality(struct ieee80211_hw *hw,
 228                                         struct rtl_stats *pstatus)
 229 {
 230         struct rtl_priv *rtlpriv = rtl_priv(hw);
 231         u32 last_evm, n_stream, tmpval;
 232
 233         if (pstatus->signalquality == 0)
 234                 return;
 235
 236         if (rtlpriv->stats.ui_link_quality.total_num++ >=
 237             PHY_LINKQUALITY_SLID_WIN_MAX) {
 238                 rtlpriv->stats.ui_link_quality.total_num =
 239                     PHY_LINKQUALITY_SLID_WIN_MAX;
 240                 last_evm = rtlpriv->stats.ui_link_quality.elements[
 241                         rtlpriv->stats.ui_link_quality.index];
 242                 rtlpriv->stats.ui_link_quality.total_val -= last_evm;
 243         }
 244         rtlpriv->stats.ui_link_quality.total_val += pstatus->signalquality;
 245         rtlpriv->stats.ui_link_quality.elements[
 246                 rtlpriv->stats.ui_link_quality.index++] =
 247                                                         pstatus->signalquality;
 248         if (rtlpriv->stats.ui_link_quality.index >=
 249             PHY_LINKQUALITY_SLID_WIN_MAX)
 250                 rtlpriv->stats.ui_link_quality.index = 0;
 251         tmpval = rtlpriv->stats.ui_link_quality.total_val /
 252             rtlpriv->stats.ui_link_quality.total_num;
 253         rtlpriv->stats.signal_quality = tmpval;
 254         rtlpriv->stats.last_sigstrength_inpercent = tmpval;
 255         for (n_stream = 0; n_stream < 2; n_stream++) {
 256                 if (pstatus->rx_mimo_signalquality[n_stream] != -1) {
 257                         if (rtlpriv->stats.rx_evm_percentage[n_stream] == 0) {
 258                                 rtlpriv->stats.rx_evm_percentage[n_stream] =
 259                                     pstatus->rx_mimo_signalquality[n_stream];
 260                         }
 261                         rtlpriv->stats.rx_evm_percentage[n_stream] =
 262                             ((rtlpriv->stats.rx_evm_percentage[n_stream]
 263                               * (RX_SMOOTH_FACTOR - 1)) +
 264                              (pstatus->rx_mimo_signalquality[n_stream] * 1)) /
 265                             (RX_SMOOTH_FACTOR);
 266                 }
 267         }
 268 }
 269
 270 void rtl_process_phyinfo(struct ieee80211_hw *hw, u8 *buffer,
 271                          struct rtl_stats *pstatus)
 272 {
 273
 274         if (!pstatus->b_packet_matchbssid)
 275                 return;
 276
 277         rtl_process_ui_rssi(hw, pstatus);
 278         rtl_process_pwdb(hw, pstatus);
 279         rtl_process_ui_link_quality(hw, pstatus);
 280 }
 281 //EXPORT_SYMBOL(rtl_process_phyinfo);