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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 * 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
33u8 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}
42EXPORT_SYMBOL(rtl_query_rxpwrpercentage);
43
44u8 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}
60EXPORT_SYMBOL(rtl_evm_db_to_percentage);
61
62static 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
72long 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}
99EXPORT_SYMBOL(rtl_signal_scale_mapping);
100
101static void rtl_process_ui_rssi(struct ieee80211_hw *hw,
102 struct rtl_stats *pstatus)
103{
104 struct rtl_priv *rtlpriv = rtl_priv(hw);
105 struct rtl_phy *rtlphy = &(rtlpriv->phy);
106 u8 rfpath;
107 u32 last_rssi, tmpval;
108
109 rtlpriv->stats.rssi_calculate_cnt++;
110
111 if (rtlpriv->stats.ui_rssi.total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
112 rtlpriv->stats.ui_rssi.total_num = PHY_RSSI_SLID_WIN_MAX;
113 last_rssi = rtlpriv->stats.ui_rssi.elements[
114 rtlpriv->stats.ui_rssi.index];
115 rtlpriv->stats.ui_rssi.total_val -= last_rssi;
116 }
117 rtlpriv->stats.ui_rssi.total_val += pstatus->signalstrength;
118 rtlpriv->stats.ui_rssi.elements[rtlpriv->stats.ui_rssi.index++] =
119 pstatus->signalstrength;
120 if (rtlpriv->stats.ui_rssi.index >= PHY_RSSI_SLID_WIN_MAX)
121 rtlpriv->stats.ui_rssi.index = 0;
122 tmpval = rtlpriv->stats.ui_rssi.total_val /
123 rtlpriv->stats.ui_rssi.total_num;
124 rtlpriv->stats.signal_strength = rtl_translate_todbm(hw,
125 (u8) tmpval);
126 pstatus->rssi = rtlpriv->stats.signal_strength;
127
128 if (pstatus->is_cck)
129 return;
130
131 for (rfpath = RF90_PATH_A; rfpath < rtlphy->num_total_rfpath;
132 rfpath++) {
133 if (rtlpriv->stats.rx_rssi_percentage[rfpath] == 0) {
134 rtlpriv->stats.rx_rssi_percentage[rfpath] =
135 pstatus->rx_mimo_signalstrength[rfpath];
136
137 }
138 if (pstatus->rx_mimo_signalstrength[rfpath] >
139 rtlpriv->stats.rx_rssi_percentage[rfpath]) {
140 rtlpriv->stats.rx_rssi_percentage[rfpath] =
141 ((rtlpriv->stats.rx_rssi_percentage[rfpath] *
142 (RX_SMOOTH_FACTOR - 1)) +
143 (pstatus->rx_mimo_signalstrength[rfpath])) /
144 (RX_SMOOTH_FACTOR);
145 rtlpriv->stats.rx_rssi_percentage[rfpath] =
146 rtlpriv->stats.rx_rssi_percentage[rfpath] + 1;
147 } else {
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 }
154 }
155}
156
157static void rtl_update_rxsignalstatistics(struct ieee80211_hw *hw,
158 struct rtl_stats *pstatus)
159{
160 struct rtl_priv *rtlpriv = rtl_priv(hw);
161 int weighting = 0;
162
163 if (rtlpriv->stats.recv_signal_power == 0)
164 rtlpriv->stats.recv_signal_power = pstatus->recvsignalpower;
165 if (pstatus->recvsignalpower > rtlpriv->stats.recv_signal_power)
166 weighting = 5;
167 else if (pstatus->recvsignalpower < rtlpriv->stats.recv_signal_power)
168 weighting = (-5);
169 rtlpriv->stats.recv_signal_power = (rtlpriv->stats.recv_signal_power *
170 5 + pstatus->recvsignalpower + weighting) / 6;
171}
172
173static void rtl_process_pwdb(struct ieee80211_hw *hw, struct rtl_stats *pstatus)
174{
175 struct rtl_priv *rtlpriv = rtl_priv(hw);
176 struct rtl_sta_info *drv_priv = NULL;
177 struct ieee80211_sta *sta = NULL;
178 long undec_sm_pwdb;
179 long undec_sm_cck;
180
181 rcu_read_lock();
182 if (rtlpriv->mac80211.opmode != NL80211_IFTYPE_STATION)
183 sta = rtl_find_sta(hw, pstatus->psaddr);
184
185 /* adhoc or ap mode */
186 if (sta) {
187 drv_priv = (struct rtl_sta_info *) sta->drv_priv;
188 undec_sm_pwdb = drv_priv->rssi_stat.undec_sm_pwdb;
189 undec_sm_cck = drv_priv->rssi_stat.undec_sm_cck;
190 } else {
191 undec_sm_pwdb = rtlpriv->dm.undec_sm_pwdb;
192 undec_sm_cck = rtlpriv->dm.undec_sm_cck;
193 }
194
195 if (undec_sm_pwdb < 0)
196 undec_sm_pwdb = pstatus->rx_pwdb_all;
197 if (undec_sm_cck < 0)
198 undec_sm_cck = pstatus->rx_pwdb_all;
199 if (pstatus->rx_pwdb_all > (u32) undec_sm_pwdb) {
200 undec_sm_pwdb = (((undec_sm_pwdb) *
201 (RX_SMOOTH_FACTOR - 1)) +
202 (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
203 undec_sm_pwdb = undec_sm_pwdb + 1;
204 } else {
205 undec_sm_pwdb = (((undec_sm_pwdb) * (RX_SMOOTH_FACTOR - 1)) +
206 (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
207 }
208 if (pstatus->rx_pwdb_all > (u32) undec_sm_cck) {
209 undec_sm_cck = (((undec_sm_pwdb) *
210 (RX_SMOOTH_FACTOR - 1)) +
211 (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
212 undec_sm_cck = undec_sm_cck + 1;
213 } else {
214 undec_sm_pwdb = (((undec_sm_cck) * (RX_SMOOTH_FACTOR - 1)) +
215 (pstatus->rx_pwdb_all)) / (RX_SMOOTH_FACTOR);
216 }
217
218 if (sta) {
219 drv_priv->rssi_stat.undec_sm_pwdb = undec_sm_pwdb;
220 } else {
221 rtlpriv->dm.undec_sm_pwdb = undec_sm_pwdb;
222 }
223 rcu_read_unlock();
224
225 rtl_update_rxsignalstatistics(hw, pstatus);
226}
227
228static void rtl_process_ui_link_quality(struct ieee80211_hw *hw,
229 struct rtl_stats *pstatus)
230{
231 struct rtl_priv *rtlpriv = rtl_priv(hw);
232 u32 last_evm, n_stream, tmpval;
233
234 if (pstatus->signalquality == 0)
235 return;
236
237 if (rtlpriv->stats.ui_link_quality.total_num++ >=
238 PHY_LINKQUALITY_SLID_WIN_MAX) {
239 rtlpriv->stats.ui_link_quality.total_num =
240 PHY_LINKQUALITY_SLID_WIN_MAX;
241 last_evm = rtlpriv->stats.ui_link_quality.elements[
242 rtlpriv->stats.ui_link_quality.index];
243 rtlpriv->stats.ui_link_quality.total_val -= last_evm;
244 }
245 rtlpriv->stats.ui_link_quality.total_val += pstatus->signalquality;
246 rtlpriv->stats.ui_link_quality.elements[
247 rtlpriv->stats.ui_link_quality.index++] =
248 pstatus->signalquality;
249 if (rtlpriv->stats.ui_link_quality.index >=
250 PHY_LINKQUALITY_SLID_WIN_MAX)
251 rtlpriv->stats.ui_link_quality.index = 0;
252 tmpval = rtlpriv->stats.ui_link_quality.total_val /
253 rtlpriv->stats.ui_link_quality.total_num;
254 rtlpriv->stats.signal_quality = tmpval;
255 rtlpriv->stats.last_sigstrength_inpercent = tmpval;
256 for (n_stream = 0; n_stream < 2; n_stream++) {
257 if (pstatus->rx_mimo_sig_qual[n_stream] != -1) {
258 if (rtlpriv->stats.rx_evm_percentage[n_stream] == 0) {
259 rtlpriv->stats.rx_evm_percentage[n_stream] =
260 pstatus->rx_mimo_sig_qual[n_stream];
261 }
262 rtlpriv->stats.rx_evm_percentage[n_stream] =
263 ((rtlpriv->stats.rx_evm_percentage[n_stream]
264 * (RX_SMOOTH_FACTOR - 1)) +
265 (pstatus->rx_mimo_sig_qual[n_stream] * 1)) /
266 (RX_SMOOTH_FACTOR);
267 }
268 }
269}
270
271void rtl_process_phyinfo(struct ieee80211_hw *hw, u8 *buffer,
272 struct rtl_stats *pstatus)
273{
274
275 if (!pstatus->packet_matchbssid)
276 return;
277
278 rtl_process_ui_rssi(hw, pstatus);
279 rtl_process_pwdb(hw, pstatus);
280 rtl_process_ui_link_quality(hw, pstatus);
281}
282EXPORT_SYMBOL(rtl_process_phyinfo);