BatteryService.java revision a82842f98d64897e92e1012404863f940bd03d26
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[] { "--checkin", "-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 static final int BATTERY_LEVEL_WARNING = 15; 96 97 private final Context mContext; 98 private final IBatteryStats mBatteryStats; 99 100 private boolean mAcOnline; 101 private boolean mUsbOnline; 102 private int mBatteryStatus; 103 private int mBatteryHealth; 104 private boolean mBatteryPresent; 105 private int mBatteryLevel; 106 private int mBatteryVoltage; 107 private int mBatteryTemperature; 108 private String mBatteryTechnology; 109 private boolean mBatteryLevelCritical; 110 111 private int mLastBatteryStatus; 112 private int mLastBatteryHealth; 113 private boolean mLastBatteryPresent; 114 private int mLastBatteryLevel; 115 private int mLastBatteryVoltage; 116 private int mLastBatteryTemperature; 117 private boolean mLastBatteryLevelCritical; 118 119 private int mPlugType; 120 private int mLastPlugType = -1; // Extra state so we can detect first run 121 122 private long mDischargeStartTime; 123 private int mDischargeStartLevel; 124 125 126 public BatteryService(Context context) { 127 mContext = context; 128 mBatteryStats = BatteryStatsService.getService(); 129 130 mUEventObserver.startObserving("SUBSYSTEM=power_supply"); 131 132 // set initial status 133 update(); 134 } 135 136 final boolean isPowered() { 137 // assume we are powered if battery state is unknown so the "stay on while plugged in" option will work. 138 return (mAcOnline || mUsbOnline || mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN); 139 } 140 141 final boolean isPowered(int plugTypeSet) { 142 // assume we are powered if battery state is unknown so 143 // the "stay on while plugged in" option will work. 144 if (mBatteryStatus == BatteryManager.BATTERY_STATUS_UNKNOWN) { 145 return true; 146 } 147 if (plugTypeSet == 0) { 148 return false; 149 } 150 int plugTypeBit = 0; 151 if (mAcOnline) { 152 plugTypeBit |= BatteryManager.BATTERY_PLUGGED_AC; 153 } 154 if (mUsbOnline) { 155 plugTypeBit |= BatteryManager.BATTERY_PLUGGED_USB; 156 } 157 return (plugTypeSet & plugTypeBit) != 0; 158 } 159 160 final int getPlugType() { 161 return mPlugType; 162 } 163 164 private UEventObserver mUEventObserver = new UEventObserver() { 165 @Override 166 public void onUEvent(UEventObserver.UEvent event) { 167 update(); 168 } 169 }; 170 171 // returns battery level as a percentage 172 final int getBatteryLevel() { 173 return mBatteryLevel; 174 } 175 176 private native void native_update(); 177 178 private synchronized final void update() { 179 native_update(); 180 181 boolean logOutlier = false; 182 long dischargeDuration = 0; 183 184 mBatteryLevelCritical = mBatteryLevel <= CRITICAL_BATTERY_LEVEL; 185 if (mAcOnline) { 186 mPlugType = BatteryManager.BATTERY_PLUGGED_AC; 187 } else if (mUsbOnline) { 188 mPlugType = BatteryManager.BATTERY_PLUGGED_USB; 189 } else { 190 mPlugType = BATTERY_PLUGGED_NONE; 191 } 192 if (mBatteryStatus != mLastBatteryStatus || 193 mBatteryHealth != mLastBatteryHealth || 194 mBatteryPresent != mLastBatteryPresent || 195 mBatteryLevel != mLastBatteryLevel || 196 mPlugType != mLastPlugType || 197 mBatteryVoltage != mLastBatteryVoltage || 198 mBatteryTemperature != mLastBatteryTemperature) { 199 200 if (mPlugType != mLastPlugType) { 201 if (mLastPlugType == BATTERY_PLUGGED_NONE) { 202 // discharging -> charging 203 204 // There's no value in this data unless we've discharged at least once and the 205 // battery level has changed; so don't log until it does. 206 if (mDischargeStartTime != 0 && mDischargeStartLevel != mBatteryLevel) { 207 dischargeDuration = SystemClock.elapsedRealtime() - mDischargeStartTime; 208 logOutlier = true; 209 EventLog.writeEvent(LOG_BATTERY_DISCHARGE_STATUS, dischargeDuration, 210 mDischargeStartLevel, mBatteryLevel); 211 // make sure we see a discharge event before logging again 212 mDischargeStartTime = 0; 213 } 214 } else if (mPlugType == BATTERY_PLUGGED_NONE) { 215 // charging -> discharging or we just powered up 216 mDischargeStartTime = SystemClock.elapsedRealtime(); 217 mDischargeStartLevel = mBatteryLevel; 218 } 219 } 220 if (mBatteryStatus != mLastBatteryStatus || 221 mBatteryHealth != mLastBatteryHealth || 222 mBatteryPresent != mLastBatteryPresent || 223 mPlugType != mLastPlugType) { 224 EventLog.writeEvent(LOG_BATTERY_STATUS, 225 mBatteryStatus, mBatteryHealth, mBatteryPresent ? 1 : 0, 226 mPlugType, mBatteryTechnology); 227 } 228 if (mBatteryLevel != mLastBatteryLevel || 229 mBatteryVoltage != mLastBatteryVoltage || 230 mBatteryTemperature != mLastBatteryTemperature) { 231 EventLog.writeEvent(LOG_BATTERY_LEVEL, 232 mBatteryLevel, mBatteryVoltage, mBatteryTemperature); 233 } 234 if (mBatteryLevel != mLastBatteryLevel && mPlugType == BATTERY_PLUGGED_NONE) { 235 // If the battery level has changed and we are on battery, update the current level. 236 // This is used for discharge cycle tracking so this shouldn't be updated while the 237 // battery is charging. 238 try { 239 mBatteryStats.recordCurrentLevel(mBatteryLevel); 240 } catch (RemoteException e) { 241 // Should never happen. 242 } 243 } 244 if (mBatteryLevelCritical && !mLastBatteryLevelCritical && 245 mPlugType == BATTERY_PLUGGED_NONE) { 246 // We want to make sure we log discharge cycle outliers 247 // if the battery is about to die. 248 dischargeDuration = SystemClock.elapsedRealtime() - mDischargeStartTime; 249 logOutlier = true; 250 } 251 252 // Separate broadcast is sent for power connected / not connected 253 // since the standard intent will not wake any applications and some 254 // applications may want to have smart behavior based on this. 255 if (mPlugType != 0 && mLastPlugType == 0) { 256 Intent intent = new Intent(Intent.ACTION_POWER_CONNECTED); 257 intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); 258 mContext.sendBroadcast(intent); 259 } 260 else if (mPlugType == 0 && mLastPlugType != 0) { 261 Intent intent = new Intent(Intent.ACTION_POWER_DISCONNECTED); 262 intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY_BEFORE_BOOT); 263 mContext.sendBroadcast(intent); 264 } 265 266 final boolean plugged = mPlugType != BATTERY_PLUGGED_NONE; 267 final boolean oldPlugged = mLastPlugType != BATTERY_PLUGGED_NONE; 268 269 /* The ACTION_BATTERY_LOW broadcast is sent in these situations: 270 * - is just un-plugged (previously was plugged) and battery level is under WARNING, or 271 * - is not plugged and battery level crosses the WARNING boundary (becomes < 15). 272 */ 273 final boolean sendBatteryLow = !plugged 274 && mBatteryLevel < BATTERY_LEVEL_WARNING 275 && (oldPlugged || mLastBatteryLevel >= BATTERY_LEVEL_WARNING); 276 277 mLastBatteryStatus = mBatteryStatus; 278 mLastBatteryHealth = mBatteryHealth; 279 mLastBatteryPresent = mBatteryPresent; 280 mLastBatteryLevel = mBatteryLevel; 281 mLastPlugType = mPlugType; 282 mLastBatteryVoltage = mBatteryVoltage; 283 mLastBatteryTemperature = mBatteryTemperature; 284 mLastBatteryLevelCritical = mBatteryLevelCritical; 285 286 sendIntent(); 287 if (sendBatteryLow) { 288 mContext.sendBroadcast(new Intent(Intent.ACTION_BATTERY_LOW)); 289 } 290 291 // This needs to be done after sendIntent() so that we get the lastest battery stats. 292 if (logOutlier && dischargeDuration != 0) { 293 logOutlier(dischargeDuration); 294 } 295 } 296 } 297 298 private final void sendIntent() { 299 // Pack up the values and broadcast them to everyone 300 Intent intent = new Intent(Intent.ACTION_BATTERY_CHANGED); 301 intent.addFlags(Intent.FLAG_RECEIVER_REGISTERED_ONLY); 302 try { 303 mBatteryStats.setOnBattery(mPlugType == BATTERY_PLUGGED_NONE, mBatteryLevel); 304 } catch (RemoteException e) { 305 // Should never happen. 306 } 307 308 int icon = getIcon(mBatteryLevel); 309 310 intent.putExtra("status", mBatteryStatus); 311 intent.putExtra("health", mBatteryHealth); 312 intent.putExtra("present", mBatteryPresent); 313 intent.putExtra("level", mBatteryLevel); 314 intent.putExtra("scale", BATTERY_SCALE); 315 intent.putExtra("icon-small", icon); 316 intent.putExtra("plugged", mPlugType); 317 intent.putExtra("voltage", mBatteryVoltage); 318 intent.putExtra("temperature", mBatteryTemperature); 319 intent.putExtra("technology", mBatteryTechnology); 320 321 if (false) { 322 Log.d(TAG, "updateBattery level:" + mBatteryLevel + 323 " scale:" + BATTERY_SCALE + " status:" + mBatteryStatus + 324 " health:" + mBatteryHealth + " present:" + mBatteryPresent + 325 " voltage: " + mBatteryVoltage + 326 " temperature: " + mBatteryTemperature + 327 " technology: " + mBatteryTechnology + 328 " AC powered:" + mAcOnline + " USB powered:" + mUsbOnline + 329 " icon:" + icon ); 330 } 331 332 ActivityManagerNative.broadcastStickyIntent(intent, null); 333 } 334 335 private final void logBatteryStats() { 336 337 IBinder batteryInfoService = ServiceManager.getService(BATTERY_STATS_SERVICE_NAME); 338 if (batteryInfoService != null) { 339 byte[] buffer = new byte[DUMP_MAX_LENGTH]; 340 File dumpFile = null; 341 FileOutputStream dumpStream = null; 342 try { 343 // dump the service to a file 344 dumpFile = new File(DUMPSYS_DATA_PATH + BATTERY_STATS_SERVICE_NAME + ".dump"); 345 dumpStream = new FileOutputStream(dumpFile); 346 batteryInfoService.dump(dumpStream.getFD(), DUMPSYS_ARGS); 347 dumpStream.getFD().sync(); 348 349 // read dumped file above into buffer truncated to DUMP_MAX_LENGTH 350 // and insert into events table. 351 int length = (int) Math.min(dumpFile.length(), DUMP_MAX_LENGTH); 352 FileInputStream fileInputStream = new FileInputStream(dumpFile); 353 int nread = fileInputStream.read(buffer, 0, length); 354 if (nread > 0) { 355 Checkin.logEvent(mContext.getContentResolver(), 356 Checkin.Events.Tag.BATTERY_DISCHARGE_INFO, 357 new String(buffer, 0, nread)); 358 if (LOCAL_LOGV) Log.v(TAG, "dumped " + nread + "b from " + 359 batteryInfoService + "to log"); 360 if (LOCAL_LOGV) Log.v(TAG, "actual dump:" + new String(buffer, 0, nread)); 361 } 362 } catch (RemoteException e) { 363 Log.e(TAG, "failed to dump service '" + BATTERY_STATS_SERVICE_NAME + 364 "':" + e); 365 } catch (IOException e) { 366 Log.e(TAG, "failed to write dumpsys file: " + e); 367 } finally { 368 // make sure we clean up 369 if (dumpStream != null) { 370 try { 371 dumpStream.close(); 372 } catch (IOException e) { 373 Log.e(TAG, "failed to close dumpsys output stream"); 374 } 375 } 376 if (dumpFile != null && !dumpFile.delete()) { 377 Log.e(TAG, "failed to delete temporary dumpsys file: " 378 + dumpFile.getAbsolutePath()); 379 } 380 } 381 } 382 } 383 384 private final void logOutlier(long duration) { 385 ContentResolver cr = mContext.getContentResolver(); 386 String dischargeThresholdString = Settings.Gservices.getString(cr, 387 Settings.Gservices.BATTERY_DISCHARGE_THRESHOLD); 388 String durationThresholdString = Settings.Gservices.getString(cr, 389 Settings.Gservices.BATTERY_DISCHARGE_DURATION_THRESHOLD); 390 391 if (dischargeThresholdString != null && durationThresholdString != null) { 392 try { 393 long durationThreshold = Long.parseLong(durationThresholdString); 394 int dischargeThreshold = Integer.parseInt(dischargeThresholdString); 395 if (duration <= durationThreshold && 396 mDischargeStartLevel - mBatteryLevel >= dischargeThreshold) { 397 // If the discharge cycle is bad enough we want to know about it. 398 logBatteryStats(); 399 } 400 if (LOCAL_LOGV) Log.v(TAG, "duration threshold: " + durationThreshold + 401 " discharge threshold: " + dischargeThreshold); 402 if (LOCAL_LOGV) Log.v(TAG, "duration: " + duration + " discharge: " + 403 (mDischargeStartLevel - mBatteryLevel)); 404 } catch (NumberFormatException e) { 405 Log.e(TAG, "Invalid DischargeThresholds GService string: " + 406 durationThresholdString + " or " + dischargeThresholdString); 407 return; 408 } 409 } 410 } 411 412 private final int getIcon(int level) { 413 if (mBatteryStatus == BatteryManager.BATTERY_STATUS_CHARGING) { 414 return com.android.internal.R.drawable.stat_sys_battery_charge; 415 } else if (mBatteryStatus == BatteryManager.BATTERY_STATUS_DISCHARGING || 416 mBatteryStatus == BatteryManager.BATTERY_STATUS_NOT_CHARGING || 417 mBatteryStatus == BatteryManager.BATTERY_STATUS_FULL) { 418 return com.android.internal.R.drawable.stat_sys_battery; 419 } else { 420 return com.android.internal.R.drawable.stat_sys_battery_unknown; 421 } 422 } 423 424 @Override 425 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 426 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 427 != PackageManager.PERMISSION_GRANTED) { 428 429 pw.println("Permission Denial: can't dump Battery service from from pid=" 430 + Binder.getCallingPid() 431 + ", uid=" + Binder.getCallingUid()); 432 return; 433 } 434 435 synchronized (this) { 436 pw.println("Current Battery Service state:"); 437 pw.println(" AC powered: " + mAcOnline); 438 pw.println(" USB powered: " + mUsbOnline); 439 pw.println(" status: " + mBatteryStatus); 440 pw.println(" health: " + mBatteryHealth); 441 pw.println(" present: " + mBatteryPresent); 442 pw.println(" level: " + mBatteryLevel); 443 pw.println(" scale: " + BATTERY_SCALE); 444 pw.println(" voltage:" + mBatteryVoltage); 445 pw.println(" temperature: " + mBatteryTemperature); 446 pw.println(" technology: " + mBatteryTechnology); 447 } 448 } 449} 450