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 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
  32 #include <linux/export.h>
  33 #endif
  34
  35 u8 rtl_query_rxpwrpercentage(char antpower)
  36 {
  37         if ((antpower <= -100) || (antpower >= 20))
  38                 return 0;
  39         else if (antpower >= 0)
  40                 return 100;
  41         else
  42                 return (100 + antpower);
  43 }
  44 //EXPORT_SYMBOL(rtl_query_rxpwrpercentage);
  45
  46 u8 rtl_evm_db_to_percentage(char value)
  47 {
  48         char ret_val;
  49         ret_val = value;
  50
  51         if (ret_val >= 0)
  52                 ret_val = 0;
  53         if (ret_val <= -33)
  54                 ret_val = -33;
  55         ret_val = 0 - ret_val;
  56         ret_val *= 3;
  57         if (ret_val == 99)
  58                 ret_val = 100;
  59
  60         return ret_val;
  61 }
  62 //EXPORT_SYMBOL(rtl_evm_db_to_percentage);
  63
  64 long rtl_translate_todbm(struct ieee80211_hw *hw,
  65                          u8 signal_strength_index)
  66 {
  67         long signal_power;
  68
  69         signal_power = (long)((signal_strength_index + 1) >> 1);
  70         signal_power -= 95;
  71         return signal_power;
  72 }
  73
  74 long rtl_signal_scale_mapping(struct ieee80211_hw *hw, long currsig)
  75 {
  76         long retsig;
  77
  78         if (currsig >= 61 && currsig <= 100)
  79                 retsig = 90 + ((currsig - 60) / 4);
  80         else if (currsig >= 41 && currsig <= 60)
  81                 retsig = 78 + ((currsig - 40) / 2);
  82         else if (currsig >= 31 && currsig <= 40)
  83                 retsig = 66 + (currsig - 30);
  84         else if (currsig >= 21 && currsig <= 30)
  85                 retsig = 54 + (currsig - 20);
  86         else if (currsig >= 5 && currsig <= 20)
  87                 retsig = 42 + (((currsig - 5) * 2) / 3);
  88         else if (currsig == 4)
  89                 retsig = 36;
  90         else if (currsig == 3)
  91                 retsig = 27;
  92         else if (currsig == 2)
  93                 retsig = 18;
  94         else if (currsig == 1)
  95                 retsig = 9;
  96         else
  97                 retsig = currsig;
  98
  99         return retsig;
 100 }
 101 //EXPORT_SYMBOL(rtl_signal_scale_mapping);
 102
 103 void rtl_process_ui_rssi(struct ieee80211_hw *hw, struct rtl_stats *pstatus)
 104 {
 105         struct rtl_priv *rtlpriv = rtl_priv(hw);
 106         struct rtl_phy *rtlphy = &(rtlpriv->phy);
 107         u8 rfpath;
 108         u32 last_rssi, tmpval;
 109
 110         if (!pstatus->b_packet_toself && !pstatus->b_packet_beacon)
 111                 return;
 112
 113         rtlpriv->stats.pwdb_all_cnt += pstatus->rx_pwdb_all;
 114         rtlpriv->stats.rssi_calculate_cnt++;
 115
 116         if (rtlpriv->stats.ui_rssi.total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
 117                 rtlpriv->stats.ui_rssi.total_num = PHY_RSSI_SLID_WIN_MAX;
 118                 last_rssi = rtlpriv->stats.ui_rssi.elements[
 119                         rtlpriv->stats.ui_rssi.index];
 120                 rtlpriv->stats.ui_rssi.total_val -= last_rssi;
 121         }
 122         rtlpriv->stats.ui_rssi.total_val += pstatus->signalstrength;
 123         rtlpriv->stats.ui_rssi.elements[rtlpriv->stats.ui_rssi.index++] =
 124             pstatus->signalstrength;
 125         if (rtlpriv->stats.ui_rssi.index >= PHY_RSSI_SLID_WIN_MAX)
 126                 rtlpriv->stats.ui_rssi.index = 0;
 127         tmpval = rtlpriv->stats.ui_rssi.total_val /
 128                 rtlpriv->stats.ui_rssi.total_num;
 129         rtlpriv->stats.signal_strength = rtl_translate_todbm(hw,
 130                 (u8) tmpval);
 131         pstatus->rssi = rtlpriv->stats.signal_strength;
 132
 133         if (pstatus->b_is_cck)
 134                 return;
 135
 136         for (rfpath = RF90_PATH_A; rfpath < rtlphy->num_total_rfpath;
 137              rfpath++) {
 138                 if (rtlpriv->stats.rx_rssi_percentage[rfpath] == 0) {
 139                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 140                             pstatus->rx_mimo_signalstrength[rfpath];
 141
 142                 }
 143                 if (pstatus->rx_mimo_signalstrength[rfpath] >
 144                     rtlpriv->stats.rx_rssi_percentage[rfpath]) {
 145                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 146                             ((rtlpriv->stats.rx_rssi_percentage[rfpath] *
 147                               (RX_SMOOTH_FACTOR - 1)) +
 148                              (pstatus->rx_mimo_signalstrength[rfpath])) /
 149                             (RX_SMOOTH_FACTOR);
 150                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 151                             rtlpriv->stats.rx_rssi_percentage[rfpath] + 1;
 152                 } else {
 153                         rtlpriv->stats.rx_rssi_percentage[rfpath] =
 154                             ((rtlpriv->stats.rx_rssi_percentage[rfpath] *
 155                               (RX_SMOOTH_FACTOR - 1)) +
 156                              (pstatus->rx_mimo_signalstrength[rfpath])) /
 157                             (RX_SMOOTH_FACTOR);
 158                 }
 159                 rtlpriv->stats.rx_snr_db[rfpath] = pstatus->rx_snr[rfpath];
 160                 rtlpriv->stats.rx_evm_dbm[rfpath] =
 161                                         pstatus->rx_mimo_evm_dbm[rfpath];
 162                 rtlpriv->stats.rx_cfo_short[rfpath] =
 163                                         pstatus->cfo_short[rfpath];
 164                 rtlpriv->stats.rx_cfo_tail[rfpath] = pstatus->cfo_tail[rfpath];
 165         }
 166 }
 167
 168 static void rtl_update_rxsignalstatistics(struct ieee80211_hw *hw,
 169                                           struct rtl_stats *pstatus)
 170 {
 171         struct rtl_priv *rtlpriv = rtl_priv(hw);
 172         int weighting = 0;
 173
 174         if (rtlpriv->stats.recv_signal_power == 0)
 175                 rtlpriv->stats.recv_signal_power = pstatus->recvsignalpower;
 176         if (pstatus->recvsignalpower > rtlpriv->stats.recv_signal_power)
 177                 weighting = 5;
 178         else if (pstatus->recvsignalpower < rtlpriv->stats.recv_signal_power)
 179                 weighting = (-5);
 180         rtlpriv->stats.recv_signal_power = (rtlpriv->stats.recv_signal_power *
 181                 5 + pstatus->recvsignalpower + weighting) / 6;
 182 }
 183
 184 static void rtl_process_pwdb(struct ieee80211_hw *hw, struct rtl_stats *pstatus)
 185 {
 186         struct rtl_priv *rtlpriv = rtl_priv(hw);
 187         struct rtl_sta_info *drv_priv = NULL;
 188         struct ieee80211_sta *sta = NULL;
 189         long undecorated_smoothed_pwdb;
 190
 191         rcu_read_lock();
 192         if (rtlpriv->mac80211.opmode != NL80211_IFTYPE_STATION)
 193                 sta = rtl_find_sta(hw, pstatus->psaddr);
 194
 195         /* adhoc or ap mode */
 196         if (sta) {
 197                 drv_priv = (struct rtl_sta_info *) sta->drv_priv;
 198                 undecorated_smoothed_pwdb =
 199                         drv_priv->rssi_stat.undecorated_smoothed_pwdb;
 200         } else {
 201                 undecorated_smoothed_pwdb =
 202                         rtlpriv->dm.undecorated_smoothed_pwdb;
 203         }
 204
 205         if (undecorated_smoothed_pwdb < 0)
 206                 undecorated_smoothed_pwdb = pstatus->rx_pwdb_all;
 207         if (pstatus->rx_pwdb_all > (u32) undecorated_smoothed_pwdb) {
 208                 undecorated_smoothed_pwdb = (((undecorated_smoothed_pwdb) *
 209                       (RX_SMOOTH_FACTOR - 1)) +
 210                      (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
 211                 undecorated_smoothed_pwdb = undecorated_smoothed_pwdb + 1;
 212         } else {
 213                 undecorated_smoothed_pwdb = (((undecorated_smoothed_pwdb) *
 214                       (RX_SMOOTH_FACTOR - 1)) +
 215                      (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
 216         }
 217
 218         if(sta) {
 219                 drv_priv->rssi_stat.undecorated_smoothed_pwdb =
 220                         undecorated_smoothed_pwdb;
 221         } else {
 222                 rtlpriv->dm.undecorated_smoothed_pwdb = undecorated_smoothed_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_signalquality[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_signalquality[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_signalquality[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->b_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);