/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.server;
import com.android.internal.app.IBatteryStats;
import com.android.server.am.BatteryStatsService;
import android.app.ActivityManagerNative;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.BatteryManager;
import android.os.Binder;
import android.os.Debug;
import android.os.IBinder;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.SystemClock;
import android.os.UEventObserver;
import android.provider.Checkin;
import android.provider.Settings;
import android.util.EventLog;
import android.util.Log;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
/**
* <p>BatteryService monitors the charging status, and charge level of the device
* battery. When these values change this service broadcasts the new values
* to all {@link android.content.BroadcastReceiver IntentReceivers} that are
* watching the {@link android.content.Intent#ACTION_BATTERY_CHANGED
* BATTERY_CHANGED} action.</p>
* <p>The new values are stored in the Intent data and can be retrieved by
* calling {@link android.content.Intent#getExtra Intent.getExtra} with the
* following keys:</p>
* <p>"scale" - int, the maximum value for the charge level</p>
* <p>"level" - int, charge level, from 0 through "scale" inclusive</p>
* <p>"status" - String, the current charging status.<br />
* <p>"health" - String, the current battery health.<br />
* <p>"present" - boolean, true if the battery is present<br />
* <p>"icon-small" - int, suggested small icon to use for this state</p>
* <p>"plugged" - int, 0 if the device is not plugged in; 1 if plugged
* into an AC power adapter; 2 if plugged in via USB.</p>
* <p>"voltage" - int, current battery voltage in millivolts</p>
* <p>"temperature" - int, current battery temperature in tenths of
* a degree Centigrade</p>
* <p>"technology" - String, the type of battery installed, e.g. "Li-ion"</p>
*/
class BatteryService extends Binder {
private static final String TAG = BatteryService.class.getSimpleName();
private static final boolean LOCAL_LOGV = false;
static final int LOG_BATTERY_LEVEL = 2722;
static final int LOG_BATTERY_STATUS = 2723;
static final int LOG_BATTERY_DISCHARGE_STATUS = 2730;
static final int BATTERY_SCALE = 100; // battery capacity is a percentage
// Used locally for determining when to make a last ditch effort to log
// discharge stats before the device dies.
private static final int CRITICAL_BATTERY_LEVEL = 4;
private static final int DUMP_MAX_LENGTH = 24 * 1024;
private static final String[] DUMPSYS_ARGS = new String[] { "-c", "-u" };
private static final String BATTERY_STATS_SERVICE_NAME = "batteryinfo";
private static final String DUMPSYS_DATA_PATH = "/data/system/";
// This should probably be exposed in the API, though it's not critical
private static final int BATTERY_PLUGGED_NONE = 0;
private final Context mContext;
private final IBatteryStats mBatteryStats;
private boolean mAcOnline;
private boolean mUsbOnline;
private int mBatteryStatus;
private int mBatteryHealth;
private boolean mBatteryPresent;
private int mBatteryLevel;
private int mBatteryVoltage;
private int mBatteryTemperature;
private String mBatteryTechnology;
private boolean mBatteryLevelCritical;
private int mLastBatteryStatus;
private int mLastBatteryHealth;
private boolean mLastBatteryPresent;
private int mLastBatteryLevel;
private int mLastBatteryVoltage;
private int mLastBatteryTemperature;
private boolean mLastBatteryLevelCritical;
private int mPlugType;
private int mLastPlugType = -1; // Extra state so we can detect first run
private long mDischargeStartTime;
private int mDischargeStartLevel;
public BatteryService(Context context) {
mContext = context;
mBatteryStats = BatteryStatsService.getService();
mUEventObserver.startObserving("SUBSYSTEM=power_supply");
// set initial status
update();
}
final boolean isPowered() {
// assume we are powered if battery state is unknown so the "stay on while plugged in" option will work.
return (mAcOnline || mUsbOnline || mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN);
}
final boolean isPowered(int plugTypeSet) {
// assume we are powered if battery state is unknown so
// the "stay on while plugged in" option will work.
if (mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN) {
return true;
}
if (plugTypeSet == 0) {
return false;
}
int plugTypeBit = 0;
if (mAcOnline) {
plugTypeBit |= BatteryManager.BATTERY_PLUGGED_AC;
}
if (mUsbOnline) {
plugTypeBit |= BatteryManager.BATTERY_PLUGGED_USB;
}
return (plugTypeSet & plugTypeBit) != 0;
}
final int getPlugType() {
return mPlugType;
}
private UEventObserver mUEventObserver = new UEventObserver() {
@Override
public void onUEvent(UEventObserver.UEvent event) {
update();
}
};
// returns battery level as a percentage
final int getBatteryLevel() {
return mBatteryLevel;
}
private native void native_update();
private synchronized final void update() {
native_update();
boolean logOutlier = false;
long dischargeDuration = 0;
mBatteryLevelCritical = mBatteryLevel <= CRITICAL_BATTERY_LEVEL;
if (mAcOnline) {
mPlugType = BatteryManager.BATTERY_PLUGGED_AC;
} else if (mUsbOnline) {
mPlugType = BatteryManager.BATTERY_PLUGGED_USB;
} else {
mPlugType = BATTERY_PLUGGED_NONE;
}
if (mBatteryStatus != mLastBatteryStatus ||
mBatteryHealth != mLastBatteryHealth ||
mBatteryPresent != mLastBatteryPresent ||
mBatteryLevel != mLastBatteryLevel ||
mPlugType != mLastPlugType ||
mBatteryVoltage != mLastBatteryVoltage ||
mBatteryTemperature != mLastBatteryTemperature) {
if (mPlugType != mLastPlugType) {
if (mLastPlugType == BATTERY_PLUGGED_NONE) {
// discharging -> charging
// There's no value in this data unless we've discharged at least once and the
// battery level has changed; so don't log until it does.
if (mDischargeStartTime != 0 && mDischargeStartLevel != mBatteryLevel) {
dischargeDuration = SystemClock.elapsedRealtime() - mDischargeStartTime;
logOutlier = true;
EventLog.writeEvent(LOG_BATTERY_DISCHARGE_STATUS, dischargeDuration,
mDischargeStartLevel, mBatteryLevel);
// make sure we see a discharge event before logging again
mDischargeStartTime = 0;
}
} else if (mPlugType == BATTERY_PLUGGED_NONE) {
// charging -> discharging or we just powered up
mDischargeStartTime = SystemClock.elapsedRealtime();
mDischargeStartLevel = mBatteryLevel;
}
}
if (mBatteryStatus != mLastBatteryStatus ||
mBatteryHealth != mLastBatteryHealth ||
mBatteryPresent != mLastBatteryPresent ||
mPlugType != mLastPlugType) {
EventLog.writeEvent(LOG_BATTERY_STATUS,
mBatteryStatus, mBatteryHealth, mBatteryPresent ? 1 : 0,
mPlugType, mBatteryTechnology);
}
if (mBatteryLevel != mLastBatteryLevel ||
mBatteryVoltage != mLastBatteryVoltage ||
mBatteryTemperature != mLastBatteryTemperature) {
EventLog.writeEvent(LOG_BATTERY_LEVEL,
mBatteryLevel, mBatteryVoltage, mBatteryTemperature);
}
if (mBatteryLevelCritical && !mLastBatteryLevelCritical &&
mPlugType == BATTERY_PLUGGED_NONE) {
// We want to make sure we log discharge cycle outliers
// if the battery is about to die.
dischargeDuration = SystemClock.elapsedRealtime() - mDischargeStartTime;
logOutlier = true;
}
mLastBatteryStatus = mBatteryStatus;
mLastBatteryHealth = mBatteryHealth;
mLastBatteryPresent = mBatteryPresent;
mLastBatteryLevel = mBatteryLevel;
mLastPlugType = mPlugType;
mLastBatteryVoltage = mBatteryVoltage;
mLastBatteryTemperature = mBatteryTemperature;
mLastBatteryLevelCritical = mBatteryLevelCritical;
sendIntent();
// This needs to be done after sendIntent() so that we get the lastest battery stats.
if (logOutlier && dischargeDuration != 0) {
logOutlier(dischargeDuration);
}
}
}
private final void sendIntent() {
// Pack up the values and broadcast them to everyone
Intent intent = new Intent(Intent.ACTION_BATTERY_CHANGED);
intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY);
try {
mBatteryStats.setOnBattery(mPlugType == BATTERY_PLUGGED_NONE, mBatteryLevel);
} catch (RemoteException e) {
// Should never happen.
}
int icon = getIcon(mBatteryLevel);
intent.putExtra("status", mBatteryStatus);
intent.putExtra("health", mBatteryHealth);
intent.putExtra("present", mBatteryPresent);
intent.putExtra("level", mBatteryLevel);
intent.putExtra("scale", BATTERY_SCALE);
intent.putExtra("icon-small", icon);
intent.putExtra("plugged", mPlugType);
intent.putExtra("voltage", mBatteryVoltage);
intent.putExtra("temperature", mBatteryTemperature);
intent.putExtra("technology", mBatteryTechnology);
if (false) {
Log.d(TAG, "updateBattery level:" + mBatteryLevel +
" scale:" + BATTERY_SCALE + " status:" + mBatteryStatus +
" health:" + mBatteryHealth + " present:" + mBatteryPresent +
" voltage: " + mBatteryVoltage +
" temperature: " + mBatteryTemperature +
" technology: " + mBatteryTechnology +
" AC powered:" + mAcOnline + " USB powered:" + mUsbOnline +
" icon:" + icon );
}
ActivityManagerNative.broadcastStickyIntent(intent, null);
}
private final void logBatteryStats() {
IBinder batteryInfoService = ServiceManager.getService(BATTERY_STATS_SERVICE_NAME);
if (batteryInfoService != null) {
byte[] buffer = new byte[DUMP_MAX_LENGTH];
File dumpFile = null;
FileOutputStream dumpStream = null;
try {
// dump the service to a file
dumpFile = new File(DUMPSYS_DATA_PATH + BATTERY_STATS_SERVICE_NAME + ".dump");
dumpStream = new FileOutputStream(dumpFile);
batteryInfoService.dump(dumpStream.getFD(), DUMPSYS_ARGS);
dumpStream.getFD().sync();
// read dumped file above into buffer truncated to DUMP_MAX_LENGTH
// and insert into events table.
int length = (int) Math.min(dumpFile.length(), DUMP_MAX_LENGTH);
FileInputStream fileInputStream = new FileInputStream(dumpFile);
int nread = fileInputStream.read(buffer, 0, length);
if (nread > 0) {
Checkin.logEvent(mContext.getContentResolver(),
Checkin.Events.Tag.BATTERY_DISCHARGE_INFO,
new String(buffer, 0, nread));
if (LOCAL_LOGV) Log.v(TAG, "dumped " + nread + "b from " +
batteryInfoService + "to log");
if (LOCAL_LOGV) Log.v(TAG, "actual dump:" + new String(buffer, 0, nread));
}
} catch (RemoteException e) {
Log.e(TAG, "failed to dump service '" + BATTERY_STATS_SERVICE_NAME +
"':" + e);
} catch (IOException e) {
Log.e(TAG, "failed to write dumpsys file: " + e);
} finally {
// make sure we clean up
if (dumpStream != null) {
try {
dumpStream.close();
} catch (IOException e) {
Log.e(TAG, "failed to close dumpsys output stream");
}
}
if (dumpFile != null && !dumpFile.delete()) {
Log.e(TAG, "failed to delete temporary dumpsys file: "
+ dumpFile.getAbsolutePath());
}
}
}
}
private final void logOutlier(long duration) {
ContentResolver cr = mContext.getContentResolver();
String dischargeThresholdString = Settings.Gservices.getString(cr,
Settings.Gservices.BATTERY_DISCHARGE_THRESHOLD);
String durationThresholdString = Settings.Gservices.getString(cr,
Settings.Gservices.BATTERY_DISCHARGE_DURATION_THRESHOLD);
if (dischargeThresholdString != null && durationThresholdString != null) {
try {
long durationThreshold = Long.parseLong(durationThresholdString);
int dischargeThreshold = Integer.parseInt(dischargeThresholdString);
if (duration <= durationThreshold &&
mDischargeStartLevel - mBatteryLevel >= dischargeThreshold) {
// If the discharge cycle is bad enough we want to know about it.
logBatteryStats();
}
if (LOCAL_LOGV) Log.v(TAG, "duration threshold: " + durationThreshold +
" discharge threshold: " + dischargeThreshold);
if (LOCAL_LOGV) Log.v(TAG, "duration: " + duration + " discharge: " +
(mDischargeStartLevel - mBatteryLevel));
} catch (NumberFormatException e) {
Log.e(TAG, "Invalid DischargeThresholds GService string: " +
durationThresholdString + " or " + dischargeThresholdString);
return;
}
}
}
private final int getIcon(int level) {
if (mBatteryStatus == BatteryManager.BATTERY_STATUS_CHARGING) {
return com.android.internal.R.drawable.stat_sys_battery_charge;
} else if (mBatteryStatus == BatteryManager.BATTERY_STATUS_DISCHARGING ||
mBatteryStatus == BatteryManager.BATTERY_STATUS_NOT_CHARGING ||
mBatteryStatus == BatteryManager.BATTERY_STATUS_FULL) {
return com.android.internal.R.drawable.stat_sys_battery;
} else {
return com.android.internal.R.drawable.stat_sys_battery_unknown;
}
}
@Override
protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
!= PackageManager.PERMISSION_GRANTED) {
pw.println("Permission Denial: can't dump Battery service from from pid="
+ Binder.getCallingPid()
+ ", uid=" + Binder.getCallingUid());
return;
}
synchronized (this) {
pw.println("Current Battery Service state:");
pw.println(" AC powered: " + mAcOnline);
pw.println(" USB powered: " + mUsbOnline);
pw.println(" status: " + mBatteryStatus);
pw.println(" health: " + mBatteryHealth);
pw.println(" present: " + mBatteryPresent);
pw.println(" level: " + mBatteryLevel);
pw.println(" scale: " + BATTERY_SCALE);
pw.println(" voltage:" + mBatteryVoltage);
pw.println(" temperature: " + mBatteryTemperature);
pw.println(" technology: " + mBatteryTechnology);
}
}
}