BatteryService.java revision 6b7b4845212b3a439c527f2e1eca205b6b45fceb
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.DropBoxManager; 31import android.os.RemoteException; 32import android.os.ServiceManager; 33import android.os.SystemClock; 34import android.os.UEventObserver; 35import android.provider.Settings; 36import android.util.EventLog; 37import android.util.Slog; 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 shutdownIfOverTemp(); 181 } 182 183 private final void shutdownIfNoPower() { 184 // shut down gracefully if our battery is critically low and we are not powered. 185 // wait until the system has booted before attempting to display the shutdown dialog. 186 if (mBatteryLevel == 0 && !isPowered() && ActivityManagerNative.isSystemReady()) { 187 Intent intent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN); 188 intent.putExtra(Intent.EXTRA_KEY_CONFIRM, false); 189 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 190 mContext.startActivity(intent); 191 } 192 } 193 194 private final void shutdownIfOverTemp() { 195 // shut down gracefully if temperature is too high (> 68.0C) 196 // wait until the system has booted before attempting to display the shutdown dialog. 197 if (mBatteryTemperature > 680 && ActivityManagerNative.isSystemReady()) { 198 Intent intent = new Intent(Intent.ACTION_REQUEST_SHUTDOWN); 199 intent.putExtra(Intent.EXTRA_KEY_CONFIRM, false); 200 intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 201 mContext.startActivity(intent); 202 } 203 } 204 205 private native void native_update(); 206 207 private synchronized final void update() { 208 native_update(); 209 210 boolean logOutlier = false; 211 long dischargeDuration = 0; 212 213 mBatteryLevelCritical = mBatteryLevel <= CRITICAL_BATTERY_LEVEL; 214 if (mAcOnline) { 215 mPlugType = BatteryManager.BATTERY_PLUGGED_AC; 216 } else if (mUsbOnline) { 217 mPlugType = BatteryManager.BATTERY_PLUGGED_USB; 218 } else { 219 mPlugType = BATTERY_PLUGGED_NONE; 220 } 221 222 // Let the battery stats keep track of the current level. 223 try { 224 mBatteryStats.setBatteryState(mBatteryStatus, mBatteryHealth, 225 mPlugType, mBatteryLevel, mBatteryTemperature, 226 mBatteryVoltage); 227 } catch (RemoteException e) { 228 // Should never happen. 229 } 230 231 shutdownIfNoPower(); 232 shutdownIfOverTemp(); 233 234 if (mBatteryStatus != mLastBatteryStatus || 235 mBatteryHealth != mLastBatteryHealth || 236 mBatteryPresent != mLastBatteryPresent || 237 mBatteryLevel != mLastBatteryLevel || 238 mPlugType != mLastPlugType || 239 mBatteryVoltage != mLastBatteryVoltage || 240 mBatteryTemperature != mLastBatteryTemperature) { 241 242 if (mPlugType != mLastPlugType) { 243 if (mLastPlugType == BATTERY_PLUGGED_NONE) { 244 // discharging -> charging 245 246 // There's no value in this data unless we've discharged at least once and the 247 // battery level has changed; so don't log until it does. 248 if (mDischargeStartTime != 0 && mDischargeStartLevel != mBatteryLevel) { 249 dischargeDuration = SystemClock.elapsedRealtime() - mDischargeStartTime; 250 logOutlier = true; 251 EventLog.writeEvent(EventLogTags.BATTERY_DISCHARGE, dischargeDuration, 252 mDischargeStartLevel, mBatteryLevel); 253 // make sure we see a discharge event before logging again 254 mDischargeStartTime = 0; 255 } 256 } else if (mPlugType == BATTERY_PLUGGED_NONE) { 257 // charging -> discharging or we just powered up 258 mDischargeStartTime = SystemClock.elapsedRealtime(); 259 mDischargeStartLevel = mBatteryLevel; 260 } 261 } 262 if (mBatteryStatus != mLastBatteryStatus || 263 mBatteryHealth != mLastBatteryHealth || 264 mBatteryPresent != mLastBatteryPresent || 265 mPlugType != mLastPlugType) { 266 EventLog.writeEvent(EventLogTags.BATTERY_STATUS, 267 mBatteryStatus, mBatteryHealth, mBatteryPresent ? 1 : 0, 268 mPlugType, mBatteryTechnology); 269 } 270 if (mBatteryLevel != mLastBatteryLevel || 271 mBatteryVoltage != mLastBatteryVoltage || 272 mBatteryTemperature != mLastBatteryTemperature) { 273 EventLog.writeEvent(EventLogTags.BATTERY_LEVEL, 274 mBatteryLevel, mBatteryVoltage, mBatteryTemperature); 275 } 276 if (mBatteryLevelCritical && !mLastBatteryLevelCritical && 277 mPlugType == BATTERY_PLUGGED_NONE) { 278 // We want to make sure we log discharge cycle outliers 279 // if the battery is about to die. 280 dischargeDuration = SystemClock.elapsedRealtime() - mDischargeStartTime; 281 logOutlier = true; 282 } 283 284 final boolean plugged = mPlugType != BATTERY_PLUGGED_NONE; 285 final boolean oldPlugged = mLastPlugType != BATTERY_PLUGGED_NONE; 286 287 /* The ACTION_BATTERY_LOW broadcast is sent in these situations: 288 * - is just un-plugged (previously was plugged) and battery level is 289 * less than or equal to WARNING, or 290 * - is not plugged and battery level falls to WARNING boundary 291 * (becomes <= mLowBatteryWarningLevel). 292 */ 293 final boolean sendBatteryLow = !plugged 294 && mBatteryStatus != BatteryManager.BATTERY_STATUS_UNKNOWN 295 && mBatteryLevel <= mLowBatteryWarningLevel 296 && (oldPlugged || mLastBatteryLevel > mLowBatteryWarningLevel); 297 298 sendIntent(); 299 300 // Separate broadcast is sent for power connected / not connected 301 // since the standard intent will not wake any applications and some 302 // applications may want to have smart behavior based on this. 303 Intent statusIntent = new Intent(); 304 statusIntent.setFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); 305 if (mPlugType != 0 && mLastPlugType == 0) { 306 statusIntent.setAction(Intent.ACTION_POWER_CONNECTED); 307 mContext.sendBroadcast(statusIntent); 308 } 309 else if (mPlugType == 0 && mLastPlugType != 0) { 310 statusIntent.setAction(Intent.ACTION_POWER_DISCONNECTED); 311 mContext.sendBroadcast(statusIntent); 312 } 313 314 if (sendBatteryLow) { 315 mSentLowBatteryBroadcast = true; 316 statusIntent.setAction(Intent.ACTION_BATTERY_LOW); 317 mContext.sendBroadcast(statusIntent); 318 } else if (mSentLowBatteryBroadcast && mLastBatteryLevel >= mLowBatteryCloseWarningLevel) { 319 mSentLowBatteryBroadcast = false; 320 statusIntent.setAction(Intent.ACTION_BATTERY_OKAY); 321 mContext.sendBroadcast(statusIntent); 322 } 323 324 // This needs to be done after sendIntent() so that we get the lastest battery stats. 325 if (logOutlier && dischargeDuration != 0) { 326 logOutlier(dischargeDuration); 327 } 328 329 mLastBatteryStatus = mBatteryStatus; 330 mLastBatteryHealth = mBatteryHealth; 331 mLastBatteryPresent = mBatteryPresent; 332 mLastBatteryLevel = mBatteryLevel; 333 mLastPlugType = mPlugType; 334 mLastBatteryVoltage = mBatteryVoltage; 335 mLastBatteryTemperature = mBatteryTemperature; 336 mLastBatteryLevelCritical = mBatteryLevelCritical; 337 } 338 } 339 340 private final void sendIntent() { 341 // Pack up the values and broadcast them to everyone 342 Intent intent = new Intent(Intent.ACTION_BATTERY_CHANGED); 343 intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY 344 | Intent.FLAG_RECEIVER_REPLACE_PENDING); 345 346 int icon = getIcon(mBatteryLevel); 347 348 intent.putExtra(BatteryManager.EXTRA_STATUS, mBatteryStatus); 349 intent.putExtra(BatteryManager.EXTRA_HEALTH, mBatteryHealth); 350 intent.putExtra(BatteryManager.EXTRA_PRESENT, mBatteryPresent); 351 intent.putExtra(BatteryManager.EXTRA_LEVEL, mBatteryLevel); 352 intent.putExtra(BatteryManager.EXTRA_SCALE, BATTERY_SCALE); 353 intent.putExtra(BatteryManager.EXTRA_ICON_SMALL, icon); 354 intent.putExtra(BatteryManager.EXTRA_PLUGGED, mPlugType); 355 intent.putExtra(BatteryManager.EXTRA_VOLTAGE, mBatteryVoltage); 356 intent.putExtra(BatteryManager.EXTRA_TEMPERATURE, mBatteryTemperature); 357 intent.putExtra(BatteryManager.EXTRA_TECHNOLOGY, mBatteryTechnology); 358 359 if (false) { 360 Slog.d(TAG, "updateBattery level:" + mBatteryLevel + 361 " scale:" + BATTERY_SCALE + " status:" + mBatteryStatus + 362 " health:" + mBatteryHealth + " present:" + mBatteryPresent + 363 " voltage: " + mBatteryVoltage + 364 " temperature: " + mBatteryTemperature + 365 " technology: " + mBatteryTechnology + 366 " AC powered:" + mAcOnline + " USB powered:" + mUsbOnline + 367 " icon:" + icon ); 368 } 369 370 ActivityManagerNative.broadcastStickyIntent(intent, null); 371 } 372 373 private final void logBatteryStats() { 374 IBinder batteryInfoService = ServiceManager.getService(BATTERY_STATS_SERVICE_NAME); 375 if (batteryInfoService == null) return; 376 377 DropBoxManager db = (DropBoxManager) mContext.getSystemService(Context.DROPBOX_SERVICE); 378 if (db == null || !db.isTagEnabled("BATTERY_DISCHARGE_INFO")) return; 379 380 File dumpFile = null; 381 FileOutputStream dumpStream = null; 382 try { 383 // dump the service to a file 384 dumpFile = new File(DUMPSYS_DATA_PATH + BATTERY_STATS_SERVICE_NAME + ".dump"); 385 dumpStream = new FileOutputStream(dumpFile); 386 batteryInfoService.dump(dumpStream.getFD(), DUMPSYS_ARGS); 387 dumpStream.getFD().sync(); 388 389 // add dump file to drop box 390 db.addFile("BATTERY_DISCHARGE_INFO", dumpFile, DropBoxManager.IS_TEXT); 391 } catch (RemoteException e) { 392 Slog.e(TAG, "failed to dump battery service", e); 393 } catch (IOException e) { 394 Slog.e(TAG, "failed to write dumpsys file", e); 395 } finally { 396 // make sure we clean up 397 if (dumpStream != null) { 398 try { 399 dumpStream.close(); 400 } catch (IOException e) { 401 Slog.e(TAG, "failed to close dumpsys output stream"); 402 } 403 } 404 if (dumpFile != null && !dumpFile.delete()) { 405 Slog.e(TAG, "failed to delete temporary dumpsys file: " 406 + dumpFile.getAbsolutePath()); 407 } 408 } 409 } 410 411 private final void logOutlier(long duration) { 412 ContentResolver cr = mContext.getContentResolver(); 413 String dischargeThresholdString = Settings.Secure.getString(cr, 414 Settings.Secure.BATTERY_DISCHARGE_THRESHOLD); 415 String durationThresholdString = Settings.Secure.getString(cr, 416 Settings.Secure.BATTERY_DISCHARGE_DURATION_THRESHOLD); 417 418 if (dischargeThresholdString != null && durationThresholdString != null) { 419 try { 420 long durationThreshold = Long.parseLong(durationThresholdString); 421 int dischargeThreshold = Integer.parseInt(dischargeThresholdString); 422 if (duration <= durationThreshold && 423 mDischargeStartLevel - mBatteryLevel >= dischargeThreshold) { 424 // If the discharge cycle is bad enough we want to know about it. 425 logBatteryStats(); 426 } 427 if (LOCAL_LOGV) Slog.v(TAG, "duration threshold: " + durationThreshold + 428 " discharge threshold: " + dischargeThreshold); 429 if (LOCAL_LOGV) Slog.v(TAG, "duration: " + duration + " discharge: " + 430 (mDischargeStartLevel - mBatteryLevel)); 431 } catch (NumberFormatException e) { 432 Slog.e(TAG, "Invalid DischargeThresholds GService string: " + 433 durationThresholdString + " or " + dischargeThresholdString); 434 return; 435 } 436 } 437 } 438 439 private final int getIcon(int level) { 440 if (mBatteryStatus == BatteryManager.BATTERY_STATUS_CHARGING) { 441 return com.android.internal.R.drawable.stat_sys_battery_charge; 442 } else if (mBatteryStatus == BatteryManager.BATTERY_STATUS_DISCHARGING || 443 mBatteryStatus == BatteryManager.BATTERY_STATUS_NOT_CHARGING || 444 mBatteryStatus == BatteryManager.BATTERY_STATUS_FULL) { 445 return com.android.internal.R.drawable.stat_sys_battery; 446 } else { 447 return com.android.internal.R.drawable.stat_sys_battery_unknown; 448 } 449 } 450 451 @Override 452 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 453 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 454 != PackageManager.PERMISSION_GRANTED) { 455 456 pw.println("Permission Denial: can't dump Battery service from from pid=" 457 + Binder.getCallingPid() 458 + ", uid=" + Binder.getCallingUid()); 459 return; 460 } 461 462 synchronized (this) { 463 pw.println("Current Battery Service state:"); 464 pw.println(" AC powered: " + mAcOnline); 465 pw.println(" USB powered: " + mUsbOnline); 466 pw.println(" status: " + mBatteryStatus); 467 pw.println(" health: " + mBatteryHealth); 468 pw.println(" present: " + mBatteryPresent); 469 pw.println(" level: " + mBatteryLevel); 470 pw.println(" scale: " + BATTERY_SCALE); 471 pw.println(" voltage:" + mBatteryVoltage); 472 pw.println(" temperature: " + mBatteryTemperature); 473 pw.println(" technology: " + mBatteryTechnology); 474 } 475 } 476} 477