Adam Lesinski | e08af19 | 2015-03-25 16:42:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package com.android.internal.os; |
| 17 | |
| 18 | import android.os.BatteryStats; |
| 19 | |
| 20 | /** |
| 21 | * Estimates WiFi power usage based on timers in BatteryStats. |
| 22 | */ |
| 23 | public class WifiPowerEstimator extends PowerCalculator { |
| 24 | private final double mWifiPowerPerPacket; |
| 25 | private final double mWifiPowerOn; |
| 26 | private final double mWifiPowerScan; |
| 27 | private final double mWifiPowerBatchScan; |
| 28 | private long mTotalAppWifiRunningTimeMs = 0; |
| 29 | |
| 30 | public WifiPowerEstimator(PowerProfile profile) { |
| 31 | mWifiPowerPerPacket = getWifiPowerPerPacket(profile); |
| 32 | mWifiPowerOn = profile.getAveragePower(PowerProfile.POWER_WIFI_ON); |
| 33 | mWifiPowerScan = profile.getAveragePower(PowerProfile.POWER_WIFI_SCAN); |
| 34 | mWifiPowerBatchScan = profile.getAveragePower(PowerProfile.POWER_WIFI_BATCHED_SCAN); |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Return estimated power (in mAs) of sending a byte with the Wi-Fi radio. |
| 39 | */ |
| 40 | private static double getWifiPowerPerPacket(PowerProfile profile) { |
| 41 | final long WIFI_BPS = 1000000; // TODO: Extract average bit rates from system |
| 42 | final double WIFI_POWER = profile.getAveragePower(PowerProfile.POWER_WIFI_ACTIVE) |
| 43 | / 3600; |
| 44 | return (WIFI_POWER / (((double)WIFI_BPS) / 8 / 2048)) / (60*60); |
| 45 | } |
| 46 | |
| 47 | @Override |
| 48 | public void calculateApp(BatterySipper app, BatteryStats.Uid u, long rawRealtimeUs, |
| 49 | long rawUptimeUs, int statsType) { |
| 50 | app.wifiRxPackets = u.getNetworkActivityPackets(BatteryStats.NETWORK_WIFI_RX_DATA, |
| 51 | statsType); |
| 52 | app.wifiTxPackets = u.getNetworkActivityPackets(BatteryStats.NETWORK_WIFI_TX_DATA, |
| 53 | statsType); |
| 54 | app.wifiRxBytes = u.getNetworkActivityBytes(BatteryStats.NETWORK_WIFI_RX_DATA, |
| 55 | statsType); |
| 56 | app.wifiTxBytes = u.getNetworkActivityBytes(BatteryStats.NETWORK_WIFI_TX_DATA, |
| 57 | statsType); |
| 58 | |
| 59 | final double wifiPacketPower = (app.wifiRxPackets + app.wifiTxPackets) |
| 60 | * mWifiPowerPerPacket; |
| 61 | |
| 62 | app.wifiRunningTimeMs = u.getWifiRunningTime(rawRealtimeUs, statsType) / 1000; |
| 63 | mTotalAppWifiRunningTimeMs += app.wifiRunningTimeMs; |
| 64 | final double wifiLockPower = (app.wifiRunningTimeMs * mWifiPowerOn) / (1000*60*60); |
| 65 | |
Adam Lesinski | e283d33 | 2015-04-16 12:29:25 -0700 | [diff] [blame] | 66 | final long wifiScanTimeMs = u.getWifiScanTime(rawRealtimeUs, statsType) / 1000; |
Adam Lesinski | e08af19 | 2015-03-25 16:42:59 -0700 | [diff] [blame] | 67 | final double wifiScanPower = (wifiScanTimeMs * mWifiPowerScan) / (1000*60*60); |
| 68 | |
| 69 | double wifiBatchScanPower = 0; |
| 70 | for (int bin = 0; bin < BatteryStats.Uid.NUM_WIFI_BATCHED_SCAN_BINS; bin++) { |
| 71 | final long batchScanTimeMs = |
| 72 | u.getWifiBatchedScanTime(bin, rawRealtimeUs, statsType) / 1000; |
| 73 | final double batchScanPower = (batchScanTimeMs * mWifiPowerBatchScan) / (1000*60*60); |
| 74 | wifiBatchScanPower += batchScanPower; |
| 75 | } |
| 76 | |
| 77 | app.wifiPowerMah = wifiPacketPower + wifiLockPower + wifiScanPower + wifiBatchScanPower; |
| 78 | } |
| 79 | |
| 80 | @Override |
| 81 | public void calculateRemaining(BatterySipper app, BatteryStats stats, long rawRealtimeUs, |
| 82 | long rawUptimeUs, int statsType) { |
| 83 | final long totalRunningTimeMs = stats.getGlobalWifiRunningTime(rawRealtimeUs, statsType) |
| 84 | / 1000; |
| 85 | final double powerDrain = ((totalRunningTimeMs - mTotalAppWifiRunningTimeMs) * mWifiPowerOn) |
| 86 | / (1000*60*60); |
| 87 | app.wifiRunningTimeMs = totalRunningTimeMs; |
| 88 | app.wifiPowerMah = Math.max(0, powerDrain); |
| 89 | } |
| 90 | |
| 91 | @Override |
| 92 | public void reset() { |
| 93 | mTotalAppWifiRunningTimeMs = 0; |
| 94 | } |
| 95 | } |