BatteryService.java revision 1c633fc89bae9bf0af6fe643ac7ad2e744f27bed
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.IBinder; 30import android.os.RemoteException; 31import android.os.ServiceManager; 32import android.os.SystemClock; 33import android.os.UEventObserver; 34import android.provider.Checkin; 35import android.provider.Settings; 36import android.util.EventLog; 37import android.util.Log; 38 39import java.io.File; 40import java.io.FileDescriptor; 41import java.io.FileInputStream; 42import java.io.FileOutputStream; 43import java.io.IOException; 44import java.io.PrintWriter; 45 46 47/** 48 * <p>BatteryService monitors the charging status, and charge level of the device 49 * battery. When these values change this service broadcasts the new values 50 * to all {@link android.content.BroadcastReceiver IntentReceivers} that are 51 * watching the {@link android.content.Intent#ACTION_BATTERY_CHANGED 52 * BATTERY_CHANGED} action.</p> 53 * <p>The new values are stored in the Intent data and can be retrieved by 54 * calling {@link android.content.Intent#getExtra Intent.getExtra} with the 55 * following keys:</p> 56 * <p>"scale" - int, the maximum value for the charge level</p> 57 * <p>"level" - int, charge level, from 0 through "scale" inclusive</p> 58 * <p>"status" - String, the current charging status.<br /> 59 * <p>"health" - String, the current battery health.<br /> 60 * <p>"present" - boolean, true if the battery is present<br /> 61 * <p>"icon-small" - int, suggested small icon to use for this state</p> 62 * <p>"plugged" - int, 0 if the device is not plugged in; 1 if plugged 63 * into an AC power adapter; 2 if plugged in via USB.</p> 64 * <p>"voltage" - int, current battery voltage in millivolts</p> 65 * <p>"temperature" - int, current battery temperature in tenths of 66 * a degree Centigrade</p> 67 * <p>"technology" - String, the type of battery installed, e.g. "Li-ion"</p> 68 */ 69class BatteryService extends Binder { 70 private static final String TAG = BatteryService.class.getSimpleName(); 71 72 private static final boolean LOCAL_LOGV = false; 73 74 static final int BATTERY_SCALE = 100; // battery capacity is a percentage 75 76 // Used locally for determining when to make a last ditch effort to log 77 // discharge stats before the device dies. 78 private static final int CRITICAL_BATTERY_LEVEL = 4; 79 80 private static final int DUMP_MAX_LENGTH = 24 * 1024; 81 private static final String[] DUMPSYS_ARGS = new String[] { "--checkin", "-u" }; 82 private static final String BATTERY_STATS_SERVICE_NAME = "batteryinfo"; 83 84 private static final String DUMPSYS_DATA_PATH = "/data/system/"; 85 86 // This should probably be exposed in the API, though it's not critical 87 private static final int BATTERY_PLUGGED_NONE = 0; 88 89 private final Context mContext; 90 private final IBatteryStats mBatteryStats; 91 92 private boolean mAcOnline; 93 private boolean mUsbOnline; 94 private int mBatteryStatus; 95 private int mBatteryHealth; 96 private boolean mBatteryPresent; 97 private int mBatteryLevel; 98 private int mBatteryVoltage; 99 private int mBatteryTemperature; 100 private String mBatteryTechnology; 101 private boolean mBatteryLevelCritical; 102 103 private int mLastBatteryStatus; 104 private int mLastBatteryHealth; 105 private boolean mLastBatteryPresent; 106 private int mLastBatteryLevel; 107 private int mLastBatteryVoltage; 108 private int mLastBatteryTemperature; 109 private boolean mLastBatteryLevelCritical; 110 111 private int mLowBatteryWarningLevel; 112 private int mLowBatteryCloseWarningLevel; 113 114 private int mPlugType; 115 private int mLastPlugType = -1; // Extra state so we can detect first run 116 117 private long mDischargeStartTime; 118 private int mDischargeStartLevel; 119 120 private boolean mSentLowBatteryBroadcast = false; 121 122 public BatteryService(Context context) { 123 mContext = context; 124 mBatteryStats = BatteryStatsService.getService(); 125 126 mLowBatteryWarningLevel = mContext.getResources().getInteger( 127 com.android.internal.R.integer.config_lowBatteryWarningLevel); 128 mLowBatteryCloseWarningLevel = mContext.getResources().getInteger( 129 com.android.internal.R.integer.config_lowBatteryCloseWarningLevel); 130 131 mUEventObserver.startObserving("SUBSYSTEM=power_supply"); 132 133 // set initial status 134 update(); 135 } 136 137 final boolean isPowered() { 138 // assume we are powered if battery state is unknown so the "stay on while plugged in" option will work. 139 return (mAcOnline || mUsbOnline || mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN); 140 } 141 142 final boolean isPowered(int plugTypeSet) { 143 // assume we are powered if battery state is unknown so 144 // the "stay on while plugged in" option will work. 145 if (mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN) { 146 return true; 147 } 148 if (plugTypeSet == 0) { 149 return false; 150 } 151 int plugTypeBit = 0; 152 if (mAcOnline) { 153 plugTypeBit |= BatteryManager.BATTERY_PLUGGED_AC; 154 } 155 if (mUsbOnline) { 156 plugTypeBit |= BatteryManager.BATTERY_PLUGGED_USB; 157 } 158 return (plugTypeSet & plugTypeBit) != 0; 159 } 160 161 final int getPlugType() { 162 return mPlugType; 163 } 164 165 private UEventObserver mUEventObserver = new UEventObserver() { 166 @Override 167 public void onUEvent(UEventObserver.UEvent event) { 168 update(); 169 } 170 }; 171 172 // returns battery level as a percentage 173 final int getBatteryLevel() { 174 return mBatteryLevel; 175 } 176 177 void systemReady() { 178 // check our power situation now that it is safe to display the shutdown dialog. 179 shutdownIfNoPower(); 180 } 181 182 private final void shutdownIfNoPower() { 183 // shut down gracefully if our battery is critically low and we are not powered. 184 // wait until the system has booted before attempting to display the shutdown dialog. 185 if (mBatteryLevel == 0 && !isPowered() && ActivityManagerNative.isSystemReady()) { 186 Intent intent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN); 187 intent.putExtra(Intent.EXTRA_KEY_CONFIRM, false); 188 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 189 mContext.startActivity(intent); 190 } 191 } 192 193 private native void native_update(); 194 195 private synchronized final void update() { 196 native_update(); 197 198 boolean logOutlier = false; 199 long dischargeDuration = 0; 200 201 shutdownIfNoPower(); 202 203 mBatteryLevelCritical = mBatteryLevel <= CRITICAL_BATTERY_LEVEL; 204 if (mAcOnline) { 205 mPlugType = BatteryManager.BATTERY_PLUGGED_AC; 206 } else if (mUsbOnline) { 207 mPlugType = BatteryManager.BATTERY_PLUGGED_USB; 208 } else { 209 mPlugType = BATTERY_PLUGGED_NONE; 210 } 211 if (mBatteryStatus != mLastBatteryStatus || 212 mBatteryHealth != mLastBatteryHealth || 213 mBatteryPresent != mLastBatteryPresent || 214 mBatteryLevel != mLastBatteryLevel || 215 mPlugType != mLastPlugType || 216 mBatteryVoltage != mLastBatteryVoltage || 217 mBatteryTemperature != mLastBatteryTemperature) { 218 219 if (mPlugType != mLastPlugType) { 220 if (mLastPlugType == BATTERY_PLUGGED_NONE) { 221 // discharging -> charging 222 223 // There's no value in this data unless we've discharged at least once and the 224 // battery level has changed; so don't log until it does. 225 if (mDischargeStartTime != 0 && mDischargeStartLevel != mBatteryLevel) { 226 dischargeDuration = SystemClock.elapsedRealtime() - mDischargeStartTime; 227 logOutlier = true; 228 EventLog.writeEvent(EventLogTags.BATTERY_DISCHARGE, dischargeDuration, 229 mDischargeStartLevel, mBatteryLevel); 230 // make sure we see a discharge event before logging again 231 mDischargeStartTime = 0; 232 } 233 } else if (mPlugType == BATTERY_PLUGGED_NONE) { 234 // charging -> discharging or we just powered up 235 mDischargeStartTime = SystemClock.elapsedRealtime(); 236 mDischargeStartLevel = mBatteryLevel; 237 } 238 } 239 if (mBatteryStatus != mLastBatteryStatus || 240 mBatteryHealth != mLastBatteryHealth || 241 mBatteryPresent != mLastBatteryPresent || 242 mPlugType != mLastPlugType) { 243 EventLog.writeEvent(EventLogTags.BATTERY_STATUS, 244 mBatteryStatus, mBatteryHealth, mBatteryPresent ? 1 : 0, 245 mPlugType, mBatteryTechnology); 246 } 247 if (mBatteryLevel != mLastBatteryLevel || 248 mBatteryVoltage != mLastBatteryVoltage || 249 mBatteryTemperature != mLastBatteryTemperature) { 250 EventLog.writeEvent(EventLogTags.BATTERY_LEVEL, 251 mBatteryLevel, mBatteryVoltage, mBatteryTemperature); 252 } 253 if (mBatteryLevel != mLastBatteryLevel && mPlugType == BATTERY_PLUGGED_NONE) { 254 // If the battery level has changed and we are on battery, update the current level. 255 // This is used for discharge cycle tracking so this shouldn't be updated while the 256 // battery is charging. 257 try { 258 mBatteryStats.recordCurrentLevel(mBatteryLevel); 259 } catch (RemoteException e) { 260 // Should never happen. 261 } 262 } 263 if (mBatteryLevelCritical && !mLastBatteryLevelCritical && 264 mPlugType == BATTERY_PLUGGED_NONE) { 265 // We want to make sure we log discharge cycle outliers 266 // if the battery is about to die. 267 dischargeDuration = SystemClock.elapsedRealtime() - mDischargeStartTime; 268 logOutlier = true; 269 } 270 271 final boolean plugged = mPlugType != BATTERY_PLUGGED_NONE; 272 final boolean oldPlugged = mLastPlugType != BATTERY_PLUGGED_NONE; 273 274 /* The ACTION_BATTERY_LOW broadcast is sent in these situations: 275 * - is just un-plugged (previously was plugged) and battery level is 276 * less than or equal to WARNING, or 277 * - is not plugged and battery level falls to WARNING boundary 278 * (becomes <= mLowBatteryWarningLevel). 279 */ 280 final boolean sendBatteryLow = !plugged 281 && mBatteryStatus != BatteryManager.BATTERY_STATUS_UNKNOWN 282 && mBatteryLevel <= mLowBatteryWarningLevel 283 && (oldPlugged || mLastBatteryLevel > mLowBatteryWarningLevel); 284 285 sendIntent(); 286 287 // Separate broadcast is sent for power connected / not connected 288 // since the standard intent will not wake any applications and some 289 // applications may want to have smart behavior based on this. 290 Intent statusIntent = new Intent(); 291 statusIntent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); 292 if (mPlugType != 0 && mLastPlugType == 0) { 293 statusIntent.setAction(Intent.ACTION_POWER_CONNECTED); 294 mContext.sendBroadcast(statusIntent); 295 } 296 else if (mPlugType == 0 && mLastPlugType != 0) { 297 statusIntent.setAction(Intent.ACTION_POWER_DISCONNECTED); 298 mContext.sendBroadcast(statusIntent); 299 } 300 301 if (sendBatteryLow) { 302 mSentLowBatteryBroadcast = true; 303 statusIntent.setAction(Intent.ACTION_BATTERY_LOW); 304 mContext.sendBroadcast(statusIntent); 305 } else if (mSentLowBatteryBroadcast && mLastBatteryLevel >= mLowBatteryCloseWarningLevel) { 306 mSentLowBatteryBroadcast = false; 307 statusIntent.setAction(Intent.ACTION_BATTERY_OKAY); 308 mContext.sendBroadcast(statusIntent); 309 } 310 311 // This needs to be done after sendIntent() so that we get the lastest battery stats. 312 if (logOutlier && dischargeDuration != 0) { 313 logOutlier(dischargeDuration); 314 } 315 316 mLastBatteryStatus = mBatteryStatus; 317 mLastBatteryHealth = mBatteryHealth; 318 mLastBatteryPresent = mBatteryPresent; 319 mLastBatteryLevel = mBatteryLevel; 320 mLastPlugType = mPlugType; 321 mLastBatteryVoltage = mBatteryVoltage; 322 mLastBatteryTemperature = mBatteryTemperature; 323 mLastBatteryLevelCritical = mBatteryLevelCritical; 324 } 325 } 326 327 private final void sendIntent() { 328 // Pack up the values and broadcast them to everyone 329 Intent intent = new Intent(Intent.ACTION_BATTERY_CHANGED); 330 intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY 331 | Intent.FLAG_RECEIVER_REPLACE_PENDING); 332 try { 333 mBatteryStats.setOnBattery(mPlugType == BATTERY_PLUGGED_NONE, mBatteryLevel); 334 } catch (RemoteException e) { 335 // Should never happen. 336 } 337 338 int icon = getIcon(mBatteryLevel); 339 340 intent.putExtra(BatteryManager.EXTRA_STATUS, mBatteryStatus); 341 intent.putExtra(BatteryManager.EXTRA_HEALTH, mBatteryHealth); 342 intent.putExtra(BatteryManager.EXTRA_PRESENT, mBatteryPresent); 343 intent.putExtra(BatteryManager.EXTRA_LEVEL, mBatteryLevel); 344 intent.putExtra(BatteryManager.EXTRA_SCALE, BATTERY_SCALE); 345 intent.putExtra(BatteryManager.EXTRA_ICON_SMALL, icon); 346 intent.putExtra(BatteryManager.EXTRA_PLUGGED, mPlugType); 347 intent.putExtra(BatteryManager.EXTRA_VOLTAGE, mBatteryVoltage); 348 intent.putExtra(BatteryManager.EXTRA_TEMPERATURE, mBatteryTemperature); 349 intent.putExtra(BatteryManager.EXTRA_TECHNOLOGY, mBatteryTechnology); 350 351 if (false) { 352 Log.d(TAG, "updateBattery level:" + mBatteryLevel + 353 " scale:" + BATTERY_SCALE + " status:" + mBatteryStatus + 354 " health:" + mBatteryHealth + " present:" + mBatteryPresent + 355 " voltage: " + mBatteryVoltage + 356 " temperature: " + mBatteryTemperature + 357 " technology: " + mBatteryTechnology + 358 " AC powered:" + mAcOnline + " USB powered:" + mUsbOnline + 359 " icon:" + icon ); 360 } 361 362 ActivityManagerNative.broadcastStickyIntent(intent, null); 363 } 364 365 private final void logBatteryStats() { 366 367 IBinder batteryInfoService = ServiceManager.getService(BATTERY_STATS_SERVICE_NAME); 368 if (batteryInfoService != null) { 369 byte[] buffer = new byte[DUMP_MAX_LENGTH]; 370 File dumpFile = null; 371 FileOutputStream dumpStream = null; 372 try { 373 // dump the service to a file 374 dumpFile = new File(DUMPSYS_DATA_PATH + BATTERY_STATS_SERVICE_NAME + ".dump"); 375 dumpStream = new FileOutputStream(dumpFile); 376 batteryInfoService.dump(dumpStream.getFD(), DUMPSYS_ARGS); 377 dumpStream.getFD().sync(); 378 379 // read dumped file above into buffer truncated to DUMP_MAX_LENGTH 380 // and insert into events table. 381 int length = (int) Math.min(dumpFile.length(), DUMP_MAX_LENGTH); 382 FileInputStream fileInputStream = new FileInputStream(dumpFile); 383 int nread = fileInputStream.read(buffer, 0, length); 384 if (nread > 0) { 385 Checkin.logEvent(mContext.getContentResolver(), 386 Checkin.Events.Tag.BATTERY_DISCHARGE_INFO, 387 new String(buffer, 0, nread)); 388 if (LOCAL_LOGV) Log.v(TAG, "dumped " + nread + "b from " + 389 batteryInfoService + "to log"); 390 if (LOCAL_LOGV) Log.v(TAG, "actual dump:" + new String(buffer, 0, nread)); 391 } 392 } catch (RemoteException e) { 393 Log.e(TAG, "failed to dump service '" + BATTERY_STATS_SERVICE_NAME + 394 "':" + e); 395 } catch (IOException e) { 396 Log.e(TAG, "failed to write dumpsys file: " + e); 397 } finally { 398 // make sure we clean up 399 if (dumpStream != null) { 400 try { 401 dumpStream.close(); 402 } catch (IOException e) { 403 Log.e(TAG, "failed to close dumpsys output stream"); 404 } 405 } 406 if (dumpFile != null && !dumpFile.delete()) { 407 Log.e(TAG, "failed to delete temporary dumpsys file: " 408 + dumpFile.getAbsolutePath()); 409 } 410 } 411 } 412 } 413 414 private final void logOutlier(long duration) { 415 ContentResolver cr = mContext.getContentResolver(); 416 String dischargeThresholdString = Settings.Gservices.getString(cr, 417 Settings.Gservices.BATTERY_DISCHARGE_THRESHOLD); 418 String durationThresholdString = Settings.Gservices.getString(cr, 419 Settings.Gservices.BATTERY_DISCHARGE_DURATION_THRESHOLD); 420 421 if (dischargeThresholdString != null && durationThresholdString != null) { 422 try { 423 long durationThreshold = Long.parseLong(durationThresholdString); 424 int dischargeThreshold = Integer.parseInt(dischargeThresholdString); 425 if (duration <= durationThreshold && 426 mDischargeStartLevel - mBatteryLevel >= dischargeThreshold) { 427 // If the discharge cycle is bad enough we want to know about it. 428 logBatteryStats(); 429 } 430 if (LOCAL_LOGV) Log.v(TAG, "duration threshold: " + durationThreshold + 431 " discharge threshold: " + dischargeThreshold); 432 if (LOCAL_LOGV) Log.v(TAG, "duration: " + duration + " discharge: " + 433 (mDischargeStartLevel - mBatteryLevel)); 434 } catch (NumberFormatException e) { 435 Log.e(TAG, "Invalid DischargeThresholds GService string: " + 436 durationThresholdString + " or " + dischargeThresholdString); 437 return; 438 } 439 } 440 } 441 442 private final int getIcon(int level) { 443 if (mBatteryStatus == BatteryManager.BATTERY_STATUS_CHARGING) { 444 return com.android.internal.R.drawable.stat_sys_battery_charge; 445 } else if (mBatteryStatus == BatteryManager.BATTERY_STATUS_DISCHARGING || 446 mBatteryStatus == BatteryManager.BATTERY_STATUS_NOT_CHARGING || 447 mBatteryStatus == BatteryManager.BATTERY_STATUS_FULL) { 448 return com.android.internal.R.drawable.stat_sys_battery; 449 } else { 450 return com.android.internal.R.drawable.stat_sys_battery_unknown; 451 } 452 } 453 454 @Override 455 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 456 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 457 != PackageManager.PERMISSION_GRANTED) { 458 459 pw.println("Permission Denial: can't dump Battery service from from pid=" 460 + Binder.getCallingPid() 461 + ", uid=" + Binder.getCallingUid()); 462 return; 463 } 464 465 synchronized (this) { 466 pw.println("Current Battery Service state:"); 467 pw.println(" AC powered: " + mAcOnline); 468 pw.println(" USB powered: " + mUsbOnline); 469 pw.println(" status: " + mBatteryStatus); 470 pw.println(" health: " + mBatteryHealth); 471 pw.println(" present: " + mBatteryPresent); 472 pw.println(" level: " + mBatteryLevel); 473 pw.println(" scale: " + BATTERY_SCALE); 474 pw.println(" voltage:" + mBatteryVoltage); 475 pw.println(" temperature: " + mBatteryTemperature); 476 pw.println(" technology: " + mBatteryTechnology); 477 } 478 } 479} 480