BatteryService.java revision 3dec7d563a2f3e1eb967ce2054a00b6620e3558c
1/* 2 * Copyright (C) 2006 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 17package com.android.server; 18 19import com.android.internal.app.IBatteryStats; 20import com.android.server.am.BatteryStatsService; 21 22import android.app.ActivityManagerNative; 23import android.content.ContentResolver; 24import android.content.Context; 25import android.content.Intent; 26import android.content.pm.PackageManager; 27import android.os.BatteryManager; 28import android.os.Binder; 29import android.os.Debug; 30import android.os.IBinder; 31import android.os.RemoteException; 32import android.os.ServiceManager; 33import android.os.SystemClock; 34import android.os.UEventObserver; 35import android.provider.Checkin; 36import android.provider.Settings; 37import android.util.EventLog; 38import android.util.Log; 39 40import java.io.File; 41import java.io.FileDescriptor; 42import java.io.FileInputStream; 43import java.io.FileOutputStream; 44import java.io.IOException; 45import java.io.PrintWriter; 46 47 48 49/** 50 * <p>BatteryService monitors the charging status, and charge level of the device 51 * battery. When these values change this service broadcasts the new values 52 * to all {@link android.content.BroadcastReceiver IntentReceivers} that are 53 * watching the {@link android.content.Intent#ACTION_BATTERY_CHANGED 54 * BATTERY_CHANGED} action.</p> 55 * <p>The new values are stored in the Intent data and can be retrieved by 56 * calling {@link android.content.Intent#getExtra Intent.getExtra} with the 57 * following keys:</p> 58 * <p>"scale" - int, the maximum value for the charge level</p> 59 * <p>"level" - int, charge level, from 0 through "scale" inclusive</p> 60 * <p>"status" - String, the current charging status.<br /> 61 * <p>"health" - String, the current battery health.<br /> 62 * <p>"present" - boolean, true if the battery is present<br /> 63 * <p>"icon-small" - int, suggested small icon to use for this state</p> 64 * <p>"plugged" - int, 0 if the device is not plugged in; 1 if plugged 65 * into an AC power adapter; 2 if plugged in via USB.</p> 66 * <p>"voltage" - int, current battery voltage in millivolts</p> 67 * <p>"temperature" - int, current battery temperature in tenths of 68 * a degree Centigrade</p> 69 * <p>"technology" - String, the type of battery installed, e.g. "Li-ion"</p> 70 */ 71class BatteryService extends Binder { 72 private static final String TAG = BatteryService.class.getSimpleName(); 73 74 private static final boolean LOCAL_LOGV = false; 75 76 static final int LOG_BATTERY_LEVEL = 2722; 77 static final int LOG_BATTERY_STATUS = 2723; 78 static final int LOG_BATTERY_DISCHARGE_STATUS = 2730; 79 80 static final int BATTERY_SCALE = 100; // battery capacity is a percentage 81 82 // Used locally for determining when to make a last ditch effort to log 83 // discharge stats before the device dies. 84 private static final int CRITICAL_BATTERY_LEVEL = 4; 85 86 private static final int DUMP_MAX_LENGTH = 24 * 1024; 87 private static final String[] DUMPSYS_ARGS = new String[] { "-c", "-u" }; 88 private static final String BATTERY_STATS_SERVICE_NAME = "batteryinfo"; 89 90 private static final String DUMPSYS_DATA_PATH = "/data/system/"; 91 92 // This should probably be exposed in the API, though it's not critical 93 private static final int BATTERY_PLUGGED_NONE = 0; 94 95 private final Context mContext; 96 private final IBatteryStats mBatteryStats; 97 98 private boolean mAcOnline; 99 private boolean mUsbOnline; 100 private int mBatteryStatus; 101 private int mBatteryHealth; 102 private boolean mBatteryPresent; 103 private int mBatteryLevel; 104 private int mBatteryVoltage; 105 private int mBatteryTemperature; 106 private String mBatteryTechnology; 107 private boolean mBatteryLevelCritical; 108 109 private int mLastBatteryStatus; 110 private int mLastBatteryHealth; 111 private boolean mLastBatteryPresent; 112 private int mLastBatteryLevel; 113 private int mLastBatteryVoltage; 114 private int mLastBatteryTemperature; 115 private boolean mLastBatteryLevelCritical; 116 117 private int mPlugType; 118 private int mLastPlugType = -1; // Extra state so we can detect first run 119 120 private long mDischargeStartTime; 121 private int mDischargeStartLevel; 122 123 124 public BatteryService(Context context) { 125 mContext = context; 126 mBatteryStats = BatteryStatsService.getService(); 127 128 mUEventObserver.startObserving("SUBSYSTEM=power_supply"); 129 130 // set initial status 131 update(); 132 } 133 134 final boolean isPowered() { 135 // assume we are powered if battery state is unknown so the "stay on while plugged in" option will work. 136 return (mAcOnline || mUsbOnline || mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN); 137 } 138 139 final boolean isPowered(int plugTypeSet) { 140 // assume we are powered if battery state is unknown so 141 // the "stay on while plugged in" option will work. 142 if (mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN) { 143 return true; 144 } 145 if (plugTypeSet == 0) { 146 return false; 147 } 148 int plugTypeBit = 0; 149 if (mAcOnline) { 150 plugTypeBit |= BatteryManager.BATTERY_PLUGGED_AC; 151 } 152 if (mUsbOnline) { 153 plugTypeBit |= BatteryManager.BATTERY_PLUGGED_USB; 154 } 155 return (plugTypeSet & plugTypeBit) != 0; 156 } 157 158 final int getPlugType() { 159 return mPlugType; 160 } 161 162 private UEventObserver mUEventObserver = new UEventObserver() { 163 @Override 164 public void onUEvent(UEventObserver.UEvent event) { 165 update(); 166 } 167 }; 168 169 // returns battery level as a percentage 170 final int getBatteryLevel() { 171 return mBatteryLevel; 172 } 173 174 private native void native_update(); 175 176 private synchronized final void update() { 177 native_update(); 178 179 mBatteryLevelCritical = mBatteryLevel <= CRITICAL_BATTERY_LEVEL; 180 if (mAcOnline) { 181 mPlugType = BatteryManager.BATTERY_PLUGGED_AC; 182 } else if (mUsbOnline) { 183 mPlugType = BatteryManager.BATTERY_PLUGGED_USB; 184 } else { 185 mPlugType = BATTERY_PLUGGED_NONE; 186 } 187 if (mBatteryStatus != mLastBatteryStatus || 188 mBatteryHealth != mLastBatteryHealth || 189 mBatteryPresent != mLastBatteryPresent || 190 mBatteryLevel != mLastBatteryLevel || 191 mPlugType != mLastPlugType || 192 mBatteryVoltage != mLastBatteryVoltage || 193 mBatteryTemperature != mLastBatteryTemperature) { 194 195 if (mPlugType != mLastPlugType) { 196 if (mLastPlugType == BATTERY_PLUGGED_NONE) { 197 // discharging -> charging 198 199 // There's no value in this data unless we've discharged at least once and the 200 // battery level has changed; so don't log until it does. 201 if (mDischargeStartTime != 0 && mDischargeStartLevel != mBatteryLevel) { 202 long duration = SystemClock.elapsedRealtime() - mDischargeStartTime; 203 EventLog.writeEvent(LOG_BATTERY_DISCHARGE_STATUS, duration, 204 mDischargeStartLevel, mBatteryLevel); 205 // make sure we see a discharge event before logging again 206 mDischargeStartTime = 0; 207 208 logOutlier(duration); 209 } 210 } else if (mPlugType == BATTERY_PLUGGED_NONE) { 211 // charging -> discharging or we just powered up 212 mDischargeStartTime = SystemClock.elapsedRealtime(); 213 mDischargeStartLevel = mBatteryLevel; 214 } 215 } 216 if (mBatteryStatus != mLastBatteryStatus || 217 mBatteryHealth != mLastBatteryHealth || 218 mBatteryPresent != mLastBatteryPresent || 219 mPlugType != mLastPlugType) { 220 EventLog.writeEvent(LOG_BATTERY_STATUS, 221 mBatteryStatus, mBatteryHealth, mBatteryPresent ? 1 : 0, 222 mPlugType, mBatteryTechnology); 223 } 224 if (mBatteryLevel != mLastBatteryLevel || 225 mBatteryVoltage != mLastBatteryVoltage || 226 mBatteryTemperature != mLastBatteryTemperature) { 227 EventLog.writeEvent(LOG_BATTERY_LEVEL, 228 mBatteryLevel, mBatteryVoltage, mBatteryTemperature); 229 } 230 if (mBatteryLevelCritical && !mLastBatteryLevelCritical && 231 mPlugType == BATTERY_PLUGGED_NONE) { 232 // We want to make sure we log discharge cycle outliers 233 // if the battery is about to die. 234 logOutlier(SystemClock.elapsedRealtime() - mDischargeStartTime); 235 } 236 237 mLastBatteryStatus = mBatteryStatus; 238 mLastBatteryHealth = mBatteryHealth; 239 mLastBatteryPresent = mBatteryPresent; 240 mLastBatteryLevel = mBatteryLevel; 241 mLastPlugType = mPlugType; 242 mLastBatteryVoltage = mBatteryVoltage; 243 mLastBatteryTemperature = mBatteryTemperature; 244 mLastBatteryLevelCritical = mBatteryLevelCritical; 245 246 sendIntent(); 247 } 248 } 249 250 private final void sendIntent() { 251 // Pack up the values and broadcast them to everyone 252 Intent intent = new Intent(Intent.ACTION_BATTERY_CHANGED); 253 intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 254 try { 255 mBatteryStats.setOnBattery(mPlugType == BATTERY_PLUGGED_NONE); 256 } catch (RemoteException e) { 257 // Should never happen. 258 } 259 260 int icon = getIcon(mBatteryLevel); 261 262 intent.putExtra("status", mBatteryStatus); 263 intent.putExtra("health", mBatteryHealth); 264 intent.putExtra("present", mBatteryPresent); 265 intent.putExtra("level", mBatteryLevel); 266 intent.putExtra("scale", BATTERY_SCALE); 267 intent.putExtra("icon-small", icon); 268 intent.putExtra("plugged", mPlugType); 269 intent.putExtra("voltage", mBatteryVoltage); 270 intent.putExtra("temperature", mBatteryTemperature); 271 intent.putExtra("technology", mBatteryTechnology); 272 273 if (false) { 274 Log.d(TAG, "updateBattery level:" + mBatteryLevel + 275 " scale:" + BATTERY_SCALE + " status:" + mBatteryStatus + 276 " health:" + mBatteryHealth + " present:" + mBatteryPresent + 277 " voltage: " + mBatteryVoltage + 278 " temperature: " + mBatteryTemperature + 279 " technology: " + mBatteryTechnology + 280 " AC powered:" + mAcOnline + " USB powered:" + mUsbOnline + 281 " icon:" + icon ); 282 } 283 284 ActivityManagerNative.broadcastStickyIntent(intent, null); 285 } 286 287 private final void logBatteryStats() { 288 289 IBinder batteryInfoService = ServiceManager.getService(BATTERY_STATS_SERVICE_NAME); 290 if (batteryInfoService != null) { 291 byte[] buffer = new byte[DUMP_MAX_LENGTH]; 292 File dumpFile = null; 293 FileOutputStream dumpStream = null; 294 try { 295 // dump the service to a file 296 dumpFile = new File(DUMPSYS_DATA_PATH + BATTERY_STATS_SERVICE_NAME + ".dump"); 297 dumpStream = new FileOutputStream(dumpFile); 298 batteryInfoService.dump(dumpStream.getFD(), DUMPSYS_ARGS); 299 dumpStream.getFD().sync(); 300 301 // read dumped file above into buffer truncated to DUMP_MAX_LENGTH 302 // and insert into events table. 303 int length = (int) Math.min(dumpFile.length(), DUMP_MAX_LENGTH); 304 FileInputStream fileInputStream = new FileInputStream(dumpFile); 305 int nread = fileInputStream.read(buffer, 0, length); 306 if (nread > 0) { 307 Checkin.logEvent(mContext.getContentResolver(), 308 Checkin.Events.Tag.BATTERY_DISCHARGE_INFO, 309 new String(buffer, 0, nread)); 310 if (LOCAL_LOGV) Log.v(TAG, "dumped " + nread + "b from " + 311 batteryInfoService + "to log"); 312 if (LOCAL_LOGV) Log.v(TAG, "actual dump:" + new String(buffer, 0, nread)); 313 } 314 } catch (RemoteException e) { 315 Log.e(TAG, "failed to dump service '" + BATTERY_STATS_SERVICE_NAME + 316 "':" + e); 317 } catch (IOException e) { 318 Log.e(TAG, "failed to write dumpsys file: " + e); 319 } finally { 320 // make sure we clean up 321 if (dumpStream != null) { 322 try { 323 dumpStream.close(); 324 } catch (IOException e) { 325 Log.e(TAG, "failed to close dumpsys output stream"); 326 } 327 } 328 if (dumpFile != null && !dumpFile.delete()) { 329 Log.e(TAG, "failed to delete temporary dumpsys file: " 330 + dumpFile.getAbsolutePath()); 331 } 332 } 333 } 334 } 335 336 private final void logOutlier(long duration) { 337 ContentResolver cr = mContext.getContentResolver(); 338 String dischargeThresholdString = Settings.Gservices.getString(cr, 339 Settings.Gservices.BATTERY_DISCHARGE_THRESHOLD); 340 String durationThresholdString = Settings.Gservices.getString(cr, 341 Settings.Gservices.BATTERY_DISCHARGE_DURATION_THRESHOLD); 342 343 if (dischargeThresholdString != null && durationThresholdString != null) { 344 try { 345 long durationThreshold = Long.parseLong(durationThresholdString); 346 int dischargeThreshold = Integer.parseInt(dischargeThresholdString); 347 if (duration <= durationThreshold && 348 mDischargeStartLevel - mBatteryLevel >= dischargeThreshold) { 349 // If the discharge cycle is bad enough we want to know about it. 350 logBatteryStats(); 351 } 352 if (LOCAL_LOGV) Log.v(TAG, "duration threshold: " + durationThreshold + 353 " discharge threshold: " + dischargeThreshold); 354 if (LOCAL_LOGV) Log.v(TAG, "duration: " + duration + " discharge: " + 355 (mDischargeStartLevel - mBatteryLevel)); 356 } catch (NumberFormatException e) { 357 Log.e(TAG, "Invalid DischargeThresholds GService string: " + 358 durationThresholdString + " or " + dischargeThresholdString); 359 return; 360 } 361 } 362 } 363 364 private final int getIcon(int level) { 365 if (mBatteryStatus == BatteryManager.BATTERY_STATUS_CHARGING) { 366 return com.android.internal.R.drawable.stat_sys_battery_charge; 367 } else if (mBatteryStatus == BatteryManager.BATTERY_STATUS_DISCHARGING || 368 mBatteryStatus == BatteryManager.BATTERY_STATUS_NOT_CHARGING || 369 mBatteryStatus == BatteryManager.BATTERY_STATUS_FULL) { 370 return com.android.internal.R.drawable.stat_sys_battery; 371 } else { 372 return com.android.internal.R.drawable.stat_sys_battery_unknown; 373 } 374 } 375 376 @Override 377 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 378 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 379 != PackageManager.PERMISSION_GRANTED) { 380 381 pw.println("Permission Denial: can't dump Battery service from from pid=" 382 + Binder.getCallingPid() 383 + ", uid=" + Binder.getCallingUid()); 384 return; 385 } 386 387 synchronized (this) { 388 pw.println("Current Battery Service state:"); 389 pw.println(" AC powered: " + mAcOnline); 390 pw.println(" USB powered: " + mUsbOnline); 391 pw.println(" status: " + mBatteryStatus); 392 pw.println(" health: " + mBatteryHealth); 393 pw.println(" present: " + mBatteryPresent); 394 pw.println(" level: " + mBatteryLevel); 395 pw.println(" scale: " + BATTERY_SCALE); 396 pw.println(" voltage:" + mBatteryVoltage); 397 pw.println(" temperature: " + mBatteryTemperature); 398 pw.println(" technology: " + mBatteryTechnology); 399 } 400 } 401} 402