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 17 package com.android.server; 18 19 import com.android.internal.app.IBatteryStats; 20 import com.android.server.am.BatteryStatsService; 21 22 import android.app.ActivityManagerNative; 23 import android.content.ContentResolver; 24 import android.content.Context; 25 import android.content.Intent; 26 import android.content.pm.PackageManager; 27 import android.os.BatteryManager; 28 import android.os.Binder; 29 import android.os.IBinder; 30 import android.os.DropBoxManager; 31 import android.os.RemoteException; 32 import android.os.ServiceManager; 33 import android.os.SystemClock; 34 import android.os.UEventObserver; 35 import android.provider.Settings; 36 import android.util.EventLog; 37 import android.util.Slog; 38 39 import java.io.File; 40 import java.io.FileDescriptor; 41 import java.io.FileInputStream; 42 import java.io.FileOutputStream; 43 import java.io.IOException; 44 import 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 */ 69 class 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 shutdownIfNoPower(); 214 shutdownIfOverTemp(); 215 216 mBatteryLevelCritical = mBatteryLevel <= CRITICAL_BATTERY_LEVEL; 217 if (mAcOnline) { 218 mPlugType = BatteryManager.BATTERY_PLUGGED_AC; 219 } else if (mUsbOnline) { 220 mPlugType = BatteryManager.BATTERY_PLUGGED_USB; 221 } else { 222 mPlugType = BATTERY_PLUGGED_NONE; 223 } 224 if (mBatteryStatus != mLastBatteryStatus || 225 mBatteryHealth != mLastBatteryHealth || 226 mBatteryPresent != mLastBatteryPresent || 227 mBatteryLevel != mLastBatteryLevel || 228 mPlugType != mLastPlugType || 229 mBatteryVoltage != mLastBatteryVoltage || 230 mBatteryTemperature != mLastBatteryTemperature) { 231 232 if (mPlugType != mLastPlugType) { 233 if (mLastPlugType == BATTERY_PLUGGED_NONE) { 234 // discharging -> charging 235 236 // There's no value in this data unless we've discharged at least once and the 237 // battery level has changed; so don't log until it does. 238 if (mDischargeStartTime != 0 && mDischargeStartLevel != mBatteryLevel) { 239 dischargeDuration = SystemClock.elapsedRealtime() - mDischargeStartTime; 240 logOutlier = true; 241 EventLog.writeEvent(EventLogTags.BATTERY_DISCHARGE, dischargeDuration, 242 mDischargeStartLevel, mBatteryLevel); 243 // make sure we see a discharge event before logging again 244 mDischargeStartTime = 0; 245 } 246 } else if (mPlugType == BATTERY_PLUGGED_NONE) { 247 // charging -> discharging or we just powered up 248 mDischargeStartTime = SystemClock.elapsedRealtime(); 249 mDischargeStartLevel = mBatteryLevel; 250 } 251 } 252 if (mBatteryStatus != mLastBatteryStatus || 253 mBatteryHealth != mLastBatteryHealth || 254 mBatteryPresent != mLastBatteryPresent || 255 mPlugType != mLastPlugType) { 256 EventLog.writeEvent(EventLogTags.BATTERY_STATUS, 257 mBatteryStatus, mBatteryHealth, mBatteryPresent ? 1 : 0, 258 mPlugType, mBatteryTechnology); 259 } 260 if (mBatteryLevel != mLastBatteryLevel || 261 mBatteryVoltage != mLastBatteryVoltage || 262 mBatteryTemperature != mLastBatteryTemperature) { 263 EventLog.writeEvent(EventLogTags.BATTERY_LEVEL, 264 mBatteryLevel, mBatteryVoltage, mBatteryTemperature); 265 } 266 if (mBatteryLevel != mLastBatteryLevel && mPlugType == BATTERY_PLUGGED_NONE) { 267 // If the battery level has changed and we are on battery, update the current level. 268 // This is used for discharge cycle tracking so this shouldn't be updated while the 269 // battery is charging. 270 try { 271 mBatteryStats.recordCurrentLevel(mBatteryLevel); 272 } catch (RemoteException e) { 273 // Should never happen. 274 } 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 try { 346 mBatteryStats.setOnBattery(mPlugType == BATTERY_PLUGGED_NONE, mBatteryLevel); 347 } catch (RemoteException e) { 348 // Should never happen. 349 } 350 351 int icon = getIcon(mBatteryLevel); 352 353 intent.putExtra(BatteryManager.EXTRA_STATUS, mBatteryStatus); 354 intent.putExtra(BatteryManager.EXTRA_HEALTH, mBatteryHealth); 355 intent.putExtra(BatteryManager.EXTRA_PRESENT, mBatteryPresent); 356 intent.putExtra(BatteryManager.EXTRA_LEVEL, mBatteryLevel); 357 intent.putExtra(BatteryManager.EXTRA_SCALE, BATTERY_SCALE); 358 intent.putExtra(BatteryManager.EXTRA_ICON_SMALL, icon); 359 intent.putExtra(BatteryManager.EXTRA_PLUGGED, mPlugType); 360 intent.putExtra(BatteryManager.EXTRA_VOLTAGE, mBatteryVoltage); 361 intent.putExtra(BatteryManager.EXTRA_TEMPERATURE, mBatteryTemperature); 362 intent.putExtra(BatteryManager.EXTRA_TECHNOLOGY, mBatteryTechnology); 363 364 if (false) { 365 Slog.d(TAG, "updateBattery level:" + mBatteryLevel + 366 " scale:" + BATTERY_SCALE + " status:" + mBatteryStatus + 367 " health:" + mBatteryHealth + " present:" + mBatteryPresent + 368 " voltage: " + mBatteryVoltage + 369 " temperature: " + mBatteryTemperature + 370 " technology: " + mBatteryTechnology + 371 " AC powered:" + mAcOnline + " USB powered:" + mUsbOnline + 372 " icon:" + icon ); 373 } 374 375 ActivityManagerNative.broadcastStickyIntent(intent, null); 376 } 377 378 private final void logBatteryStats() { 379 IBinder batteryInfoService = ServiceManager.getService(BATTERY_STATS_SERVICE_NAME); 380 if (batteryInfoService == null) return; 381 382 DropBoxManager db = (DropBoxManager) mContext.getSystemService(Context.DROPBOX_SERVICE); 383 if (db == null || !db.isTagEnabled("BATTERY_DISCHARGE_INFO")) return; 384 385 File dumpFile = null; 386 FileOutputStream dumpStream = null; 387 try { 388 // dump the service to a file 389 dumpFile = new File(DUMPSYS_DATA_PATH + BATTERY_STATS_SERVICE_NAME + ".dump"); 390 dumpStream = new FileOutputStream(dumpFile); 391 batteryInfoService.dump(dumpStream.getFD(), DUMPSYS_ARGS); 392 dumpStream.getFD().sync(); 393 394 // add dump file to drop box 395 db.addFile("BATTERY_DISCHARGE_INFO", dumpFile, DropBoxManager.IS_TEXT); 396 } catch (RemoteException e) { 397 Slog.e(TAG, "failed to dump battery service", e); 398 } catch (IOException e) { 399 Slog.e(TAG, "failed to write dumpsys file", e); 400 } finally { 401 // make sure we clean up 402 if (dumpStream != null) { 403 try { 404 dumpStream.close(); 405 } catch (IOException e) { 406 Slog.e(TAG, "failed to close dumpsys output stream"); 407 } 408 } 409 if (dumpFile != null && !dumpFile.delete()) { 410 Slog.e(TAG, "failed to delete temporary dumpsys file: " 411 + dumpFile.getAbsolutePath()); 412 } 413 } 414 } 415 416 private final void logOutlier(long duration) { 417 ContentResolver cr = mContext.getContentResolver(); 418 String dischargeThresholdString = Settings.Secure.getString(cr, 419 Settings.Secure.BATTERY_DISCHARGE_THRESHOLD); 420 String durationThresholdString = Settings.Secure.getString(cr, 421 Settings.Secure.BATTERY_DISCHARGE_DURATION_THRESHOLD); 422 423 if (dischargeThresholdString != null && durationThresholdString != null) { 424 try { 425 long durationThreshold = Long.parseLong(durationThresholdString); 426 int dischargeThreshold = Integer.parseInt(dischargeThresholdString); 427 if (duration <= durationThreshold && 428 mDischargeStartLevel - mBatteryLevel >= dischargeThreshold) { 429 // If the discharge cycle is bad enough we want to know about it. 430 logBatteryStats(); 431 } 432 if (LOCAL_LOGV) Slog.v(TAG, "duration threshold: " + durationThreshold + 433 " discharge threshold: " + dischargeThreshold); 434 if (LOCAL_LOGV) Slog.v(TAG, "duration: " + duration + " discharge: " + 435 (mDischargeStartLevel - mBatteryLevel)); 436 } catch (NumberFormatException e) { 437 Slog.e(TAG, "Invalid DischargeThresholds GService string: " + 438 durationThresholdString + " or " + dischargeThresholdString); 439 return; 440 } 441 } 442 } 443 444 private final int getIcon(int level) { 445 if (mBatteryStatus == BatteryManager.BATTERY_STATUS_CHARGING) { 446 return com.android.internal.R.drawable.stat_sys_battery_charge; 447 } else if (mBatteryStatus == BatteryManager.BATTERY_STATUS_DISCHARGING || 448 mBatteryStatus == BatteryManager.BATTERY_STATUS_NOT_CHARGING || 449 mBatteryStatus == BatteryManager.BATTERY_STATUS_FULL) { 450 return com.android.internal.R.drawable.stat_sys_battery; 451 } else { 452 return com.android.internal.R.drawable.stat_sys_battery_unknown; 453 } 454 } 455 456 @Override 457 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 458 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 459 != PackageManager.PERMISSION_GRANTED) { 460 461 pw.println("Permission Denial: can't dump Battery service from from pid=" 462 + Binder.getCallingPid() 463 + ", uid=" + Binder.getCallingUid()); 464 return; 465 } 466 467 synchronized (this) { 468 pw.println("Current Battery Service state:"); 469 pw.println(" AC powered: " + mAcOnline); 470 pw.println(" USB powered: " + mUsbOnline); 471 pw.println(" status: " + mBatteryStatus); 472 pw.println(" health: " + mBatteryHealth); 473 pw.println(" present: " + mBatteryPresent); 474 pw.println(" level: " + mBatteryLevel); 475 pw.println(" scale: " + BATTERY_SCALE); 476 pw.println(" voltage:" + mBatteryVoltage); 477 pw.println(" temperature: " + mBatteryTemperature); 478 pw.println(" technology: " + mBatteryTechnology); 479 } 480 } 481 } 482