services/core/java/com/android/server/display/DisplayPowerController.java

   1 /*
   2  * Copyright (C) 2012 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.display;
  18
  19 import com.android.internal.app.IBatteryStats;
  20 import com.android.server.LocalServices;
  21 import com.android.server.am.BatteryStatsService;
  22 import com.android.server.lights.LightsManager;
  23
  24 import android.animation.Animator;
  25 import android.animation.ObjectAnimator;
  26 import android.content.Context;
  27 import android.content.res.Resources;
  28 import android.hardware.Sensor;
  29 import android.hardware.SensorEvent;
  30 import android.hardware.SensorEventListener;
  31 import android.hardware.SensorManager;
  32 import android.hardware.display.DisplayManagerInternal.DisplayPowerCallbacks;
  33 import android.hardware.display.DisplayManagerInternal.DisplayPowerRequest;
  34 import android.os.Handler;
  35 import android.os.Looper;
  36 import android.os.Message;
  37 import android.os.PowerManager;
  38 import android.os.RemoteException;
  39 import android.os.SystemClock;
  40 import android.os.Trace;
  41 import android.util.MathUtils;
  42 import android.util.Slog;
  43 import android.util.Spline;
  44 import android.util.TimeUtils;
  45 import android.view.Display;
  46 import android.view.WindowManagerPolicy;
  47
  48 import java.io.PrintWriter;
  49
  50 /**
  51  * Controls the power state of the display.
  52  *
  53  * Handles the proximity sensor, light sensor, and animations between states
  54  * including the screen off animation.
  55  *
  56  * This component acts independently of the rest of the power manager service.
  57  * In particular, it does not share any state and it only communicates
  58  * via asynchronous callbacks to inform the power manager that something has
  59  * changed.
  60  *
  61  * Everything this class does internally is serialized on its handler although
  62  * it may be accessed by other threads from the outside.
  63  *
  64  * Note that the power manager service guarantees that it will hold a suspend
  65  * blocker as long as the display is not ready.  So most of the work done here
  66  * does not need to worry about holding a suspend blocker unless it happens
  67  * independently of the display ready signal.
  68    *
  69  * For debugging, you can make the color fade and brightness animations run
  70  * slower by changing the "animator duration scale" option in Development Settings.
  71  */
  72 final class DisplayPowerController implements AutomaticBrightnessController.Callbacks {
  73     private static final String TAG = "DisplayPowerController";
  74     private static final String SCREEN_ON_BLOCKED_TRACE_NAME = "Screen on blocked";
  75
  76     private static boolean DEBUG = false;
  77     private static final boolean DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT = false;
  78
  79     // If true, uses the color fade on animation.
  80     // We might want to turn this off if we cannot get a guarantee that the screen
  81     // actually turns on and starts showing new content after the call to set the
  82     // screen state returns.  Playing the animation can also be somewhat slow.
  83     private static final boolean USE_COLOR_FADE_ON_ANIMATION = false;
  84
  85     // The minimum reduction in brightness when dimmed.
  86     private static final int SCREEN_DIM_MINIMUM_REDUCTION = 10;
  87
  88     private static final int COLOR_FADE_ON_ANIMATION_DURATION_MILLIS = 250;
  89     private static final int COLOR_FADE_OFF_ANIMATION_DURATION_MILLIS = 400;
  90
  91     private static final int MSG_UPDATE_POWER_STATE = 1;
  92     private static final int MSG_PROXIMITY_SENSOR_DEBOUNCED = 2;
  93     private static final int MSG_SCREEN_ON_UNBLOCKED = 3;
  94
  95     private static final int PROXIMITY_UNKNOWN = -1;
  96     private static final int PROXIMITY_NEGATIVE = 0;
  97     private static final int PROXIMITY_POSITIVE = 1;
  98
  99     // Proximity sensor debounce delay in milliseconds for positive or negative transitions.
 100     private static final int PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY = 0;
 101     private static final int PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY = 250;
 102
 103     // Trigger proximity if distance is less than 5 cm.
 104     private static final float TYPICAL_PROXIMITY_THRESHOLD = 5.0f;
 105
 106     // Brightness animation ramp rate in brightness units per second.
 107     private static final int BRIGHTNESS_RAMP_RATE_SLOW = 40;
 108
 109     private static final int REPORTED_TO_POLICY_SCREEN_OFF = 0;
 110     private static final int REPORTED_TO_POLICY_SCREEN_TURNING_ON = 1;
 111     private static final int REPORTED_TO_POLICY_SCREEN_ON = 2;
 112
 113     private final Object mLock = new Object();
 114
 115     private final Context mContext;
 116
 117     // Our handler.
 118     private final DisplayControllerHandler mHandler;
 119
 120     // Asynchronous callbacks into the power manager service.
 121     // Only invoked from the handler thread while no locks are held.
 122     private final DisplayPowerCallbacks mCallbacks;
 123
 124     // Battery stats.
 125     private final IBatteryStats mBatteryStats;
 126
 127     // The lights service.
 128     private final LightsManager mLights;
 129
 130     // The sensor manager.
 131     private final SensorManager mSensorManager;
 132
 133     // The window manager policy.
 134     private final WindowManagerPolicy mWindowManagerPolicy;
 135
 136     // The display blanker.
 137     private final DisplayBlanker mBlanker;
 138
 139     // The proximity sensor, or null if not available or needed.
 140     private Sensor mProximitySensor;
 141
 142     // The doze screen brightness.
 143     private final int mScreenBrightnessDozeConfig;
 144
 145     // The dim screen brightness.
 146     private final int mScreenBrightnessDimConfig;
 147
 148     // The minimum screen brightness to use in a very dark room.
 149     private final int mScreenBrightnessDarkConfig;
 150
 151     // The minimum allowed brightness.
 152     private final int mScreenBrightnessRangeMinimum;
 153
 154     // The maximum allowed brightness.
 155     private final int mScreenBrightnessRangeMaximum;
 156
 157     // True if auto-brightness should be used.
 158     private boolean mUseSoftwareAutoBrightnessConfig;
 159
 160     // True if should use light sensor to automatically determine doze screen brightness.
 161     private final boolean mAllowAutoBrightnessWhileDozingConfig;
 162
 163     // True if we should fade the screen while turning it off, false if we should play
 164     // a stylish color fade animation instead.
 165     private boolean mColorFadeFadesConfig;
 166
 167     // The pending power request.
 168     // Initially null until the first call to requestPowerState.
 169     // Guarded by mLock.
 170     private DisplayPowerRequest mPendingRequestLocked;
 171
 172     // True if a request has been made to wait for the proximity sensor to go negative.
 173     // Guarded by mLock.
 174     private boolean mPendingWaitForNegativeProximityLocked;
 175
 176     // True if the pending power request or wait for negative proximity flag
 177     // has been changed since the last update occurred.
 178     // Guarded by mLock.
 179     private boolean mPendingRequestChangedLocked;
 180
 181     // Set to true when the important parts of the pending power request have been applied.
 182     // The important parts are mainly the screen state.  Brightness changes may occur
 183     // concurrently.
 184     // Guarded by mLock.
 185     private boolean mDisplayReadyLocked;
 186
 187     // Set to true if a power state update is required.
 188     // Guarded by mLock.
 189     private boolean mPendingUpdatePowerStateLocked;
 190
 191     /* The following state must only be accessed by the handler thread. */
 192
 193     // The currently requested power state.
 194     // The power controller will progressively update its internal state to match
 195     // the requested power state.  Initially null until the first update.
 196     private DisplayPowerRequest mPowerRequest;
 197
 198     // The current power state.
 199     // Must only be accessed on the handler thread.
 200     private DisplayPowerState mPowerState;
 201
 202     // True if the device should wait for negative proximity sensor before
 203     // waking up the screen.  This is set to false as soon as a negative
 204     // proximity sensor measurement is observed or when the device is forced to
 205     // go to sleep by the user.  While true, the screen remains off.
 206     private boolean mWaitingForNegativeProximity;
 207
 208     // The actual proximity sensor threshold value.
 209     private float mProximityThreshold;
 210
 211     // Set to true if the proximity sensor listener has been registered
 212     // with the sensor manager.
 213     private boolean mProximitySensorEnabled;
 214
 215     // The debounced proximity sensor state.
 216     private int mProximity = PROXIMITY_UNKNOWN;
 217
 218     // The raw non-debounced proximity sensor state.
 219     private int mPendingProximity = PROXIMITY_UNKNOWN;
 220     private long mPendingProximityDebounceTime = -1; // -1 if fully debounced
 221
 222     // True if the screen was turned off because of the proximity sensor.
 223     // When the screen turns on again, we report user activity to the power manager.
 224     private boolean mScreenOffBecauseOfProximity;
 225
 226     // The currently active screen on unblocker.  This field is non-null whenever
 227     // we are waiting for a callback to release it and unblock the screen.
 228     private ScreenOnUnblocker mPendingScreenOnUnblocker;
 229
 230     // True if we were in the process of turning off the screen.
 231     // This allows us to recover more gracefully from situations where we abort
 232     // turning off the screen.
 233     private boolean mPendingScreenOff;
 234
 235     // True if we have unfinished business and are holding a suspend blocker.
 236     private boolean mUnfinishedBusiness;
 237
 238     // The elapsed real time when the screen on was blocked.
 239     private long mScreenOnBlockStartRealTime;
 240
 241     // Screen state we reported to policy. Must be one of REPORTED_TO_POLICY_SCREEN_* fields.
 242     private int mReportedScreenStateToPolicy;
 243
 244     // Remembers whether certain kinds of brightness adjustments
 245     // were recently applied so that we can decide how to transition.
 246     private boolean mAppliedAutoBrightness;
 247     private boolean mAppliedDimming;
 248     private boolean mAppliedLowPower;
 249
 250     // Brightness ramp rate fast.
 251     private final int mBrightnessRampRateFast;
 252
 253     // The controller for the automatic brightness level.
 254     private AutomaticBrightnessController mAutomaticBrightnessController;
 255
 256     // Animators.
 257     private ObjectAnimator mColorFadeOnAnimator;
 258     private ObjectAnimator mColorFadeOffAnimator;
 259     private RampAnimator<DisplayPowerState> mScreenBrightnessRampAnimator;
 260
 261     /**
 262      * Creates the display power controller.
 263      */
 264     public DisplayPowerController(Context context,
 265             DisplayPowerCallbacks callbacks, Handler handler,
 266             SensorManager sensorManager, DisplayBlanker blanker) {
 267         mHandler = new DisplayControllerHandler(handler.getLooper());
 268         mCallbacks = callbacks;
 269
 270         mBatteryStats = BatteryStatsService.getService();
 271         mLights = LocalServices.getService(LightsManager.class);
 272         mSensorManager = sensorManager;
 273         mWindowManagerPolicy = LocalServices.getService(WindowManagerPolicy.class);
 274         mBlanker = blanker;
 275         mContext = context;
 276
 277         final Resources resources = context.getResources();
 278         final int screenBrightnessSettingMinimum = clampAbsoluteBrightness(resources.getInteger(
 279                 com.android.internal.R.integer.config_screenBrightnessSettingMinimum));
 280
 281         mScreenBrightnessDozeConfig = clampAbsoluteBrightness(resources.getInteger(
 282                 com.android.internal.R.integer.config_screenBrightnessDoze));
 283
 284         mScreenBrightnessDimConfig = clampAbsoluteBrightness(resources.getInteger(
 285                 com.android.internal.R.integer.config_screenBrightnessDim));
 286
 287         mScreenBrightnessDarkConfig = clampAbsoluteBrightness(resources.getInteger(
 288                 com.android.internal.R.integer.config_screenBrightnessDark));
 289         if (mScreenBrightnessDarkConfig > mScreenBrightnessDimConfig) {
 290             Slog.w(TAG, "Expected config_screenBrightnessDark ("
 291                     + mScreenBrightnessDarkConfig + ") to be less than or equal to "
 292                     + "config_screenBrightnessDim (" + mScreenBrightnessDimConfig + ").");
 293         }
 294         if (mScreenBrightnessDarkConfig > mScreenBrightnessDimConfig) {
 295             Slog.w(TAG, "Expected config_screenBrightnessDark ("
 296                     + mScreenBrightnessDarkConfig + ") to be less than or equal to "
 297                     + "config_screenBrightnessSettingMinimum ("
 298                     + screenBrightnessSettingMinimum + ").");
 299         }
 300
 301         int screenBrightnessRangeMinimum = Math.min(Math.min(
 302                 screenBrightnessSettingMinimum, mScreenBrightnessDimConfig),
 303                 mScreenBrightnessDarkConfig);
 304
 305         mScreenBrightnessRangeMaximum = PowerManager.BRIGHTNESS_ON;
 306
 307         mUseSoftwareAutoBrightnessConfig = resources.getBoolean(
 308                 com.android.internal.R.bool.config_automatic_brightness_available);
 309
 310         mAllowAutoBrightnessWhileDozingConfig = resources.getBoolean(
 311                 com.android.internal.R.bool.config_allowAutoBrightnessWhileDozing);
 312
 313         mBrightnessRampRateFast = resources.getInteger(
 314                 com.android.internal.R.integer.config_brightness_ramp_rate_fast);
 315
 316         int lightSensorRate = resources.getInteger(
 317                 com.android.internal.R.integer.config_autoBrightnessLightSensorRate);
 318         long brighteningLightDebounce = resources.getInteger(
 319                 com.android.internal.R.integer.config_autoBrightnessBrighteningLightDebounce);
 320         long darkeningLightDebounce = resources.getInteger(
 321                 com.android.internal.R.integer.config_autoBrightnessDarkeningLightDebounce);
 322         boolean autoBrightnessResetAmbientLuxAfterWarmUp = resources.getBoolean(
 323                 com.android.internal.R.bool.config_autoBrightnessResetAmbientLuxAfterWarmUp);
 324         int ambientLightHorizon = resources.getInteger(
 325                 com.android.internal.R.integer.config_autoBrightnessAmbientLightHorizon);
 326         float autoBrightnessAdjustmentMaxGamma = resources.getFraction(
 327                 com.android.internal.R.fraction.config_autoBrightnessAdjustmentMaxGamma,
 328                 1, 1);
 329
 330         if (mUseSoftwareAutoBrightnessConfig) {
 331             int[] lux = resources.getIntArray(
 332                     com.android.internal.R.array.config_autoBrightnessLevels);
 333             int[] screenBrightness = resources.getIntArray(
 334                     com.android.internal.R.array.config_autoBrightnessLcdBacklightValues);
 335             int lightSensorWarmUpTimeConfig = resources.getInteger(
 336                     com.android.internal.R.integer.config_lightSensorWarmupTime);
 337             final float dozeScaleFactor = resources.getFraction(
 338                     com.android.internal.R.fraction.config_screenAutoBrightnessDozeScaleFactor,
 339                     1, 1);
 340
 341             Spline screenAutoBrightnessSpline = createAutoBrightnessSpline(lux, screenBrightness);
 342             if (screenAutoBrightnessSpline == null) {
 343                 Slog.e(TAG, "Error in config.xml.  config_autoBrightnessLcdBacklightValues "
 344                         + "(size " + screenBrightness.length + ") "
 345                         + "must be monotic and have exactly one more entry than "
 346                         + "config_autoBrightnessLevels (size " + lux.length + ") "
 347                         + "which must be strictly increasing.  "
 348                         + "Auto-brightness will be disabled.");
 349                 mUseSoftwareAutoBrightnessConfig = false;
 350             } else {
 351                 int bottom = clampAbsoluteBrightness(screenBrightness[0]);
 352                 if (mScreenBrightnessDarkConfig > bottom) {
 353                     Slog.w(TAG, "config_screenBrightnessDark (" + mScreenBrightnessDarkConfig
 354                             + ") should be less than or equal to the first value of "
 355                             + "config_autoBrightnessLcdBacklightValues ("
 356                             + bottom + ").");
 357                 }
 358                 if (bottom < screenBrightnessRangeMinimum) {
 359                     screenBrightnessRangeMinimum = bottom;
 360                 }
 361                 mAutomaticBrightnessController = new AutomaticBrightnessController(this,
 362                         handler.getLooper(), sensorManager, screenAutoBrightnessSpline,
 363                         lightSensorWarmUpTimeConfig, screenBrightnessRangeMinimum,
 364                         mScreenBrightnessRangeMaximum, dozeScaleFactor, lightSensorRate,
 365                         brighteningLightDebounce, darkeningLightDebounce,
 366                         autoBrightnessResetAmbientLuxAfterWarmUp,
 367                         ambientLightHorizon, autoBrightnessAdjustmentMaxGamma);
 368             }
 369         }
 370
 371         mScreenBrightnessRangeMinimum = screenBrightnessRangeMinimum;
 372
 373         mColorFadeFadesConfig = resources.getBoolean(
 374                 com.android.internal.R.bool.config_animateScreenLights);
 375
 376         if (!DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT) {
 377             mProximitySensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
 378             if (mProximitySensor != null) {
 379                 mProximityThreshold = Math.min(mProximitySensor.getMaximumRange(),
 380                         TYPICAL_PROXIMITY_THRESHOLD);
 381             }
 382         }
 383
 384     }
 385
 386     /**
 387      * Returns true if the proximity sensor screen-off function is available.
 388      */
 389     public boolean isProximitySensorAvailable() {
 390         return mProximitySensor != null;
 391     }
 392
 393     /**
 394      * Requests a new power state.
 395      * The controller makes a copy of the provided object and then
 396      * begins adjusting the power state to match what was requested.
 397      *
 398      * @param request The requested power state.
 399      * @param waitForNegativeProximity If true, issues a request to wait for
 400      * negative proximity before turning the screen back on, assuming the screen
 401      * was turned off by the proximity sensor.
 402      * @return True if display is ready, false if there are important changes that must
 403      * be made asynchronously (such as turning the screen on), in which case the caller
 404      * should grab a wake lock, watch for {@link DisplayPowerCallbacks#onStateChanged()}
 405      * then try the request again later until the state converges.
 406      */
 407     public boolean requestPowerState(DisplayPowerRequest request,
 408             boolean waitForNegativeProximity) {
 409         if (DEBUG) {
 410             Slog.d(TAG, "requestPowerState: "
 411                     + request + ", waitForNegativeProximity=" + waitForNegativeProximity);
 412         }
 413
 414         synchronized (mLock) {
 415             boolean changed = false;
 416
 417             if (waitForNegativeProximity
 418                     && !mPendingWaitForNegativeProximityLocked) {
 419                 mPendingWaitForNegativeProximityLocked = true;
 420                 changed = true;
 421             }
 422
 423             if (mPendingRequestLocked == null) {
 424                 mPendingRequestLocked = new DisplayPowerRequest(request);
 425                 changed = true;
 426             } else if (!mPendingRequestLocked.equals(request)) {
 427                 mPendingRequestLocked.copyFrom(request);
 428                 changed = true;
 429             }
 430
 431             if (changed) {
 432                 mDisplayReadyLocked = false;
 433             }
 434
 435             if (changed && !mPendingRequestChangedLocked) {
 436                 mPendingRequestChangedLocked = true;
 437                 sendUpdatePowerStateLocked();
 438             }
 439
 440             return mDisplayReadyLocked;
 441         }
 442     }
 443
 444     private void sendUpdatePowerState() {
 445         synchronized (mLock) {
 446             sendUpdatePowerStateLocked();
 447         }
 448     }
 449
 450     private void sendUpdatePowerStateLocked() {
 451         if (!mPendingUpdatePowerStateLocked) {
 452             mPendingUpdatePowerStateLocked = true;
 453             Message msg = mHandler.obtainMessage(MSG_UPDATE_POWER_STATE);
 454             msg.setAsynchronous(true);
 455             mHandler.sendMessage(msg);
 456         }
 457     }
 458
 459     private void initialize() {
 460         // Initialize the power state object for the default display.
 461         // In the future, we might manage multiple displays independently.
 462         mPowerState = new DisplayPowerState(mBlanker,
 463                 new ColorFade(Display.DEFAULT_DISPLAY));
 464
 465         mColorFadeOnAnimator = ObjectAnimator.ofFloat(
 466                 mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 0.0f, 1.0f);
 467         mColorFadeOnAnimator.setDuration(COLOR_FADE_ON_ANIMATION_DURATION_MILLIS);
 468         mColorFadeOnAnimator.addListener(mAnimatorListener);
 469
 470         mColorFadeOffAnimator = ObjectAnimator.ofFloat(
 471                 mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 1.0f, 0.0f);
 472         mColorFadeOffAnimator.setDuration(COLOR_FADE_OFF_ANIMATION_DURATION_MILLIS);
 473         mColorFadeOffAnimator.addListener(mAnimatorListener);
 474
 475         mScreenBrightnessRampAnimator = new RampAnimator<DisplayPowerState>(
 476                 mPowerState, DisplayPowerState.SCREEN_BRIGHTNESS);
 477         mScreenBrightnessRampAnimator.setListener(mRampAnimatorListener);
 478
 479         // Initialize screen state for battery stats.
 480         try {
 481             mBatteryStats.noteScreenState(mPowerState.getScreenState());
 482             mBatteryStats.noteScreenBrightness(mPowerState.getScreenBrightness());
 483         } catch (RemoteException ex) {
 484             // same process
 485         }
 486     }
 487
 488     private final Animator.AnimatorListener mAnimatorListener = new Animator.AnimatorListener() {
 489         @Override
 490         public void onAnimationStart(Animator animation) {
 491         }
 492         @Override
 493         public void onAnimationEnd(Animator animation) {
 494             sendUpdatePowerState();
 495         }
 496         @Override
 497         public void onAnimationRepeat(Animator animation) {
 498         }
 499         @Override
 500         public void onAnimationCancel(Animator animation) {
 501         }
 502     };
 503
 504     private final RampAnimator.Listener mRampAnimatorListener = new RampAnimator.Listener() {
 505         @Override
 506         public void onAnimationEnd() {
 507             sendUpdatePowerState();
 508         }
 509     };
 510
 511     private void updatePowerState() {
 512         // Update the power state request.
 513         final boolean mustNotify;
 514         boolean mustInitialize = false;
 515         boolean autoBrightnessAdjustmentChanged = false;
 516
 517         synchronized (mLock) {
 518             mPendingUpdatePowerStateLocked = false;
 519             if (mPendingRequestLocked == null) {
 520                 return; // wait until first actual power request
 521             }
 522
 523             if (mPowerRequest == null) {
 524                 mPowerRequest = new DisplayPowerRequest(mPendingRequestLocked);
 525                 mWaitingForNegativeProximity = mPendingWaitForNegativeProximityLocked;
 526                 mPendingWaitForNegativeProximityLocked = false;
 527                 mPendingRequestChangedLocked = false;
 528                 mustInitialize = true;
 529             } else if (mPendingRequestChangedLocked) {
 530                 autoBrightnessAdjustmentChanged = (mPowerRequest.screenAutoBrightnessAdjustment
 531                         != mPendingRequestLocked.screenAutoBrightnessAdjustment);
 532                 mPowerRequest.copyFrom(mPendingRequestLocked);
 533                 mWaitingForNegativeProximity |= mPendingWaitForNegativeProximityLocked;
 534                 mPendingWaitForNegativeProximityLocked = false;
 535                 mPendingRequestChangedLocked = false;
 536                 mDisplayReadyLocked = false;
 537             }
 538
 539             mustNotify = !mDisplayReadyLocked;
 540         }
 541
 542         // Initialize things the first time the power state is changed.
 543         if (mustInitialize) {
 544             initialize();
 545         }
 546
 547         // Compute the basic display state using the policy.
 548         // We might override this below based on other factors.
 549         int state;
 550         int brightness = PowerManager.BRIGHTNESS_DEFAULT;
 551         boolean performScreenOffTransition = false;
 552         switch (mPowerRequest.policy) {
 553             case DisplayPowerRequest.POLICY_OFF:
 554                 state = Display.STATE_OFF;
 555                 performScreenOffTransition = true;
 556                 break;
 557             case DisplayPowerRequest.POLICY_DOZE:
 558                 if (mPowerRequest.dozeScreenState != Display.STATE_UNKNOWN) {
 559                     state = mPowerRequest.dozeScreenState;
 560                 } else {
 561                     state = Display.STATE_DOZE;
 562                 }
 563                 if (!mAllowAutoBrightnessWhileDozingConfig) {
 564                     brightness = mPowerRequest.dozeScreenBrightness;
 565                 }
 566                 break;
 567             case DisplayPowerRequest.POLICY_DIM:
 568             case DisplayPowerRequest.POLICY_BRIGHT:
 569             default:
 570                 state = Display.STATE_ON;
 571                 break;
 572         }
 573         assert(state != Display.STATE_UNKNOWN);
 574
 575         // Apply the proximity sensor.
 576         if (mProximitySensor != null) {
 577             if (mPowerRequest.useProximitySensor && state != Display.STATE_OFF) {
 578                 setProximitySensorEnabled(true);
 579                 if (!mScreenOffBecauseOfProximity
 580                         && mProximity == PROXIMITY_POSITIVE) {
 581                     mScreenOffBecauseOfProximity = true;
 582                     sendOnProximityPositiveWithWakelock();
 583                 }
 584             } else if (mWaitingForNegativeProximity
 585                     && mScreenOffBecauseOfProximity
 586                     && mProximity == PROXIMITY_POSITIVE
 587                     && state != Display.STATE_OFF) {
 588                 setProximitySensorEnabled(true);
 589             } else {
 590                 setProximitySensorEnabled(false);
 591                 mWaitingForNegativeProximity = false;
 592             }
 593             if (mScreenOffBecauseOfProximity
 594                     && mProximity != PROXIMITY_POSITIVE) {
 595                 mScreenOffBecauseOfProximity = false;
 596                 sendOnProximityNegativeWithWakelock();
 597             }
 598         } else {
 599             mWaitingForNegativeProximity = false;
 600         }
 601         if (mScreenOffBecauseOfProximity) {
 602             state = Display.STATE_OFF;
 603         }
 604
 605         // Animate the screen state change unless already animating.
 606         // The transition may be deferred, so after this point we will use the
 607         // actual state instead of the desired one.
 608         animateScreenStateChange(state, performScreenOffTransition);
 609         state = mPowerState.getScreenState();
 610
 611         // Use zero brightness when screen is off.
 612         if (state == Display.STATE_OFF) {
 613             brightness = PowerManager.BRIGHTNESS_OFF;
 614             mLights.getLight(LightsManager.LIGHT_ID_BUTTONS).setBrightness(brightness);
 615             mLights.getLight(LightsManager.LIGHT_ID_KEYBOARD).setBrightness(brightness);
 616         }
 617
 618         // Disable button lights when dozing
 619         if (state == Display.STATE_DOZE || state == Display.STATE_DOZE_SUSPEND) {
 620             mLights.getLight(LightsManager.LIGHT_ID_BUTTONS).setBrightness(PowerManager.BRIGHTNESS_OFF);
 621             mLights.getLight(LightsManager.LIGHT_ID_KEYBOARD).setBrightness(PowerManager.BRIGHTNESS_OFF);
 622         }
 623
 624         // Configure auto-brightness.
 625         boolean autoBrightnessEnabled = false;
 626         if (mAutomaticBrightnessController != null) {
 627             final boolean autoBrightnessEnabledInDoze = mAllowAutoBrightnessWhileDozingConfig
 628                     && (state == Display.STATE_DOZE || state == Display.STATE_DOZE_SUSPEND);
 629             autoBrightnessEnabled = mPowerRequest.useAutoBrightness
 630                     && (state == Display.STATE_ON || autoBrightnessEnabledInDoze)
 631                     && brightness < 0;
 632             final boolean userInitiatedChange = autoBrightnessAdjustmentChanged
 633                     && mPowerRequest.brightnessSetByUser;
 634             mAutomaticBrightnessController.configure(autoBrightnessEnabled,
 635                     mPowerRequest.screenAutoBrightnessAdjustment, state != Display.STATE_ON,
 636                     userInitiatedChange, mPowerRequest.useTwilight);
 637         }
 638
 639         // Apply brightness boost.
 640         // We do this here after configuring auto-brightness so that we don't
 641         // disable the light sensor during this temporary state.  That way when
 642         // boost ends we will be able to resume normal auto-brightness behavior
 643         // without any delay.
 644         if (mPowerRequest.boostScreenBrightness
 645                 && brightness != PowerManager.BRIGHTNESS_OFF) {
 646             brightness = PowerManager.BRIGHTNESS_ON;
 647         }
 648
 649         // Apply auto-brightness.
 650         boolean slowChange = false;
 651         if (brightness < 0) {
 652             if (autoBrightnessEnabled) {
 653                 brightness = mAutomaticBrightnessController.getAutomaticScreenBrightness();
 654             }
 655             if (brightness >= 0) {
 656                 // Use current auto-brightness value and slowly adjust to changes.
 657                 brightness = clampScreenBrightness(brightness);
 658                 if (mAppliedAutoBrightness && !autoBrightnessAdjustmentChanged) {
 659                     slowChange = true; // slowly adapt to auto-brightness
 660                 }
 661                 mAppliedAutoBrightness = true;
 662             } else {
 663                 mAppliedAutoBrightness = false;
 664             }
 665         } else {
 666             mAppliedAutoBrightness = false;
 667         }
 668
 669         // Use default brightness when dozing unless overridden.
 670         if (brightness < 0 && (state == Display.STATE_DOZE
 671                 || state == Display.STATE_DOZE_SUSPEND)) {
 672             brightness = mScreenBrightnessDozeConfig;
 673         }
 674
 675         // Apply manual brightness.
 676         // Use the current brightness setting from the request, which is expected
 677         // provide a nominal default value for the case where auto-brightness
 678         // is not ready yet.
 679         if (brightness < 0) {
 680             brightness = clampScreenBrightness(mPowerRequest.screenBrightness);
 681         }
 682
 683         // Apply dimming by at least some minimum amount when user activity
 684         // timeout is about to expire.
 685         if (mPowerRequest.policy == DisplayPowerRequest.POLICY_DIM) {
 686             if (brightness > mScreenBrightnessRangeMinimum) {
 687                 brightness = Math.max(Math.min(brightness - SCREEN_DIM_MINIMUM_REDUCTION,
 688                         mScreenBrightnessDimConfig), mScreenBrightnessRangeMinimum);
 689             }
 690             if (!mAppliedDimming) {
 691                 slowChange = false;
 692             }
 693             mAppliedDimming = true;
 694         } else if (mAppliedDimming) {
 695             slowChange = false;
 696             mAppliedDimming = false;
 697         }
 698
 699         // If low power mode is enabled, cut the brightness level by half
 700         // as long as it is above the minimum threshold.
 701         if (mPowerRequest.lowPowerMode) {
 702             if (brightness > mScreenBrightnessRangeMinimum) {
 703                 brightness = Math.max(brightness / 2, mScreenBrightnessRangeMinimum);
 704             }
 705             if (!mAppliedLowPower) {
 706                 slowChange = false;
 707             }
 708             mAppliedLowPower = true;
 709         } else if (mAppliedLowPower) {
 710             slowChange = false;
 711             mAppliedLowPower = false;
 712         }
 713
 714         // Animate the screen brightness when the screen is on or dozing.
 715         // Skip the animation when the screen is off or suspended.
 716         if (!mPendingScreenOff) {
 717             if (state == Display.STATE_ON || state == Display.STATE_DOZE) {
 718                 animateScreenBrightness(brightness,
 719                         slowChange ? BRIGHTNESS_RAMP_RATE_SLOW : mBrightnessRampRateFast);
 720             } else {
 721                 animateScreenBrightness(brightness, 0);
 722             }
 723         }
 724
 725         // Determine whether the display is ready for use in the newly requested state.
 726         // Note that we do not wait for the brightness ramp animation to complete before
 727         // reporting the display is ready because we only need to ensure the screen is in the
 728         // right power state even as it continues to converge on the desired brightness.
 729         final boolean ready = mPendingScreenOnUnblocker == null
 730                 && !mColorFadeOnAnimator.isStarted()
 731                 && !mColorFadeOffAnimator.isStarted()
 732                 && mPowerState.waitUntilClean(mCleanListener);
 733         final boolean finished = ready
 734                 && !mScreenBrightnessRampAnimator.isAnimating();
 735
 736         // Notify policy about screen turned on.
 737         if (ready && state != Display.STATE_OFF
 738                 && mReportedScreenStateToPolicy == REPORTED_TO_POLICY_SCREEN_TURNING_ON) {
 739             mReportedScreenStateToPolicy = REPORTED_TO_POLICY_SCREEN_ON;
 740             mWindowManagerPolicy.screenTurnedOn();
 741         }
 742
 743         // Grab a wake lock if we have unfinished business.
 744         if (!finished && !mUnfinishedBusiness) {
 745             if (DEBUG) {
 746                 Slog.d(TAG, "Unfinished business...");
 747             }
 748             mCallbacks.acquireSuspendBlocker();
 749             mUnfinishedBusiness = true;
 750         }
 751
 752         // Notify the power manager when ready.
 753         if (ready && mustNotify) {
 754             // Send state change.
 755             synchronized (mLock) {
 756                 if (!mPendingRequestChangedLocked) {
 757                     mDisplayReadyLocked = true;
 758
 759                     if (DEBUG) {
 760                         Slog.d(TAG, "Display ready!");
 761                     }
 762                 }
 763             }
 764             sendOnStateChangedWithWakelock();
 765         }
 766
 767         // Release the wake lock when we have no unfinished business.
 768         if (finished && mUnfinishedBusiness) {
 769             if (DEBUG) {
 770                 Slog.d(TAG, "Finished business...");
 771             }
 772             mUnfinishedBusiness = false;
 773             mCallbacks.releaseSuspendBlocker();
 774         }
 775     }
 776
 777     @Override
 778     public void updateBrightness() {
 779         sendUpdatePowerState();
 780     }
 781
 782     private void blockScreenOn() {
 783         if (mPendingScreenOnUnblocker == null) {
 784             Trace.asyncTraceBegin(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0);
 785             mPendingScreenOnUnblocker = new ScreenOnUnblocker();
 786             mScreenOnBlockStartRealTime = SystemClock.elapsedRealtime();
 787             Slog.i(TAG, "Blocking screen on until initial contents have been drawn.");
 788         }
 789     }
 790
 791     private void unblockScreenOn() {
 792         if (mPendingScreenOnUnblocker != null) {
 793             mPendingScreenOnUnblocker = null;
 794             long delay = SystemClock.elapsedRealtime() - mScreenOnBlockStartRealTime;
 795             Slog.i(TAG, "Unblocked screen on after " + delay + " ms");
 796             Trace.asyncTraceEnd(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0);
 797         }
 798     }
 799
 800     private boolean setScreenState(int state) {
 801         if (mPowerState.getScreenState() != state) {
 802             final boolean wasOn = (mPowerState.getScreenState() != Display.STATE_OFF);
 803             mPowerState.setScreenState(state);
 804
 805             // Tell battery stats about the transition.
 806             try {
 807                 mBatteryStats.noteScreenState(state);
 808             } catch (RemoteException ex) {
 809                 // same process
 810             }
 811         }
 812
 813         // Tell the window manager policy when the screen is turned off or on unless it's due
 814         // to the proximity sensor.  We temporarily block turning the screen on until the
 815         // window manager is ready by leaving a black surface covering the screen.
 816         // This surface is essentially the final state of the color fade animation and
 817         // it is only removed once the window manager tells us that the activity has
 818         // finished drawing underneath.
 819         final boolean isOff = (state == Display.STATE_OFF);
 820         if (isOff && mReportedScreenStateToPolicy != REPORTED_TO_POLICY_SCREEN_OFF
 821                 && !mScreenOffBecauseOfProximity) {
 822             mReportedScreenStateToPolicy = REPORTED_TO_POLICY_SCREEN_OFF;
 823             unblockScreenOn();
 824             mWindowManagerPolicy.screenTurnedOff();
 825         } else if (!isOff && mReportedScreenStateToPolicy == REPORTED_TO_POLICY_SCREEN_OFF) {
 826             mReportedScreenStateToPolicy = REPORTED_TO_POLICY_SCREEN_TURNING_ON;
 827             if (mPowerState.getColorFadeLevel() == 0.0f) {
 828                 blockScreenOn();
 829             } else {
 830                 unblockScreenOn();
 831             }
 832             mWindowManagerPolicy.screenTurningOn(mPendingScreenOnUnblocker);
 833         }
 834
 835         // Return true if the screen isn't blocked.
 836         return mPendingScreenOnUnblocker == null;
 837     }
 838
 839     private int clampScreenBrightness(int value) {
 840         return MathUtils.constrain(
 841                 value, mScreenBrightnessRangeMinimum, mScreenBrightnessRangeMaximum);
 842     }
 843
 844     private void animateScreenBrightness(int target, int rate) {
 845         if (DEBUG) {
 846             Slog.d(TAG, "Animating brightness: target=" + target +", rate=" + rate);
 847         }
 848         if (mScreenBrightnessRampAnimator.animateTo(target, rate)) {
 849             try {
 850                 mBatteryStats.noteScreenBrightness(target);
 851             } catch (RemoteException ex) {
 852                 // same process
 853             }
 854         }
 855     }
 856
 857     private void animateScreenStateChange(int target, boolean performScreenOffTransition) {
 858         // If there is already an animation in progress, don't interfere with it.
 859         if (mColorFadeOnAnimator.isStarted()
 860                 || mColorFadeOffAnimator.isStarted()) {
 861             if (target != Display.STATE_ON) {
 862                 return;
 863             }
 864             // If display state changed to on, proceed and stop the color fade and turn screen on.
 865             mPendingScreenOff = false;
 866         }
 867
 868         // If we were in the process of turning off the screen but didn't quite
 869         // finish.  Then finish up now to prevent a jarring transition back
 870         // to screen on if we skipped blocking screen on as usual.
 871         if (mPendingScreenOff && target != Display.STATE_OFF) {
 872             setScreenState(Display.STATE_OFF);
 873             mPendingScreenOff = false;
 874             mPowerState.dismissColorFadeResources();
 875         }
 876
 877         if (target == Display.STATE_ON) {
 878             // Want screen on.  The contents of the screen may not yet
 879             // be visible if the color fade has not been dismissed because
 880             // its last frame of animation is solid black.
 881             if (!setScreenState(Display.STATE_ON)) {
 882                 return; // screen on blocked
 883             }
 884             if (USE_COLOR_FADE_ON_ANIMATION && mPowerRequest.isBrightOrDim()) {
 885                 // Perform screen on animation.
 886                 if (mPowerState.getColorFadeLevel() == 1.0f) {
 887                     mPowerState.dismissColorFade();
 888                 } else if (mPowerState.prepareColorFade(mContext,
 889                         mColorFadeFadesConfig ?
 890                                 ColorFade.MODE_FADE :
 891                                         ColorFade.MODE_WARM_UP)) {
 892                     mColorFadeOnAnimator.start();
 893                 } else {
 894                     mColorFadeOnAnimator.end();
 895                 }
 896             } else {
 897                 // Skip screen on animation.
 898                 mPowerState.setColorFadeLevel(1.0f);
 899                 mPowerState.dismissColorFade();
 900             }
 901         } else if (target == Display.STATE_DOZE) {
 902             // Want screen dozing.
 903             // Wait for brightness animation to complete beforehand when entering doze
 904             // from screen on to prevent a perceptible jump because brightness may operate
 905             // differently when the display is configured for dozing.
 906             if (mScreenBrightnessRampAnimator.isAnimating()
 907                     && mPowerState.getScreenState() == Display.STATE_ON) {
 908                 return;
 909             }
 910
 911             // Set screen state.
 912             if (!setScreenState(Display.STATE_DOZE)) {
 913                 return; // screen on blocked
 914             }
 915
 916             // Dismiss the black surface without fanfare.
 917             mPowerState.setColorFadeLevel(1.0f);
 918             mPowerState.dismissColorFade();
 919         } else if (target == Display.STATE_DOZE_SUSPEND) {
 920             // Want screen dozing and suspended.
 921             // Wait for brightness animation to complete beforehand unless already
 922             // suspended because we may not be able to change it after suspension.
 923             if (mScreenBrightnessRampAnimator.isAnimating()
 924                     && mPowerState.getScreenState() != Display.STATE_DOZE_SUSPEND) {
 925                 return;
 926             }
 927
 928             // If not already suspending, temporarily set the state to doze until the
 929             // screen on is unblocked, then suspend.
 930             if (mPowerState.getScreenState() != Display.STATE_DOZE_SUSPEND) {
 931                 if (!setScreenState(Display.STATE_DOZE)) {
 932                     return; // screen on blocked
 933                 }
 934                 setScreenState(Display.STATE_DOZE_SUSPEND); // already on so can't block
 935             }
 936
 937             // Dismiss the black surface without fanfare.
 938             mPowerState.setColorFadeLevel(1.0f);
 939             mPowerState.dismissColorFade();
 940         } else {
 941             // Want screen off.
 942             mPendingScreenOff = true;
 943             if (mPowerState.getColorFadeLevel() == 0.0f) {
 944                 // Turn the screen off.
 945                 // A black surface is already hiding the contents of the screen.
 946                 setScreenState(Display.STATE_OFF);
 947                 mPendingScreenOff = false;
 948                 mPowerState.dismissColorFadeResources();
 949             } else if (performScreenOffTransition
 950                     && mPowerState.prepareColorFade(mContext,
 951                             mColorFadeFadesConfig ?
 952                                     ColorFade.MODE_FADE : ColorFade.MODE_COOL_DOWN)
 953                     && mPowerState.getScreenState() != Display.STATE_OFF) {
 954                 // Perform the screen off animation.
 955                 mColorFadeOffAnimator.start();
 956             } else {
 957                 // Skip the screen off animation and add a black surface to hide the
 958                 // contents of the screen.
 959                 mColorFadeOffAnimator.end();
 960             }
 961         }
 962     }
 963
 964     private final Runnable mCleanListener = new Runnable() {
 965         @Override
 966         public void run() {
 967             sendUpdatePowerState();
 968         }
 969     };
 970
 971     private void setProximitySensorEnabled(boolean enable) {
 972         if (enable) {
 973             if (!mProximitySensorEnabled) {
 974                 // Register the listener.
 975                 // Proximity sensor state already cleared initially.
 976                 mProximitySensorEnabled = true;
 977                 mSensorManager.registerListener(mProximitySensorListener, mProximitySensor,
 978                         SensorManager.SENSOR_DELAY_NORMAL, mHandler);
 979             }
 980         } else {
 981             if (mProximitySensorEnabled) {
 982                 // Unregister the listener.
 983                 // Clear the proximity sensor state for next time.
 984                 mProximitySensorEnabled = false;
 985                 mProximity = PROXIMITY_UNKNOWN;
 986                 mPendingProximity = PROXIMITY_UNKNOWN;
 987                 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED);
 988                 mSensorManager.unregisterListener(mProximitySensorListener);
 989                 clearPendingProximityDebounceTime(); // release wake lock (must be last)
 990             }
 991         }
 992     }
 993
 994     private void handleProximitySensorEvent(long time, boolean positive) {
 995         if (mProximitySensorEnabled) {
 996             if (mPendingProximity == PROXIMITY_NEGATIVE && !positive) {
 997                 return; // no change
 998             }
 999             if (mPendingProximity == PROXIMITY_POSITIVE && positive) {
1000                 return; // no change
1001             }
1002
1003             // Only accept a proximity sensor reading if it remains
1004             // stable for the entire debounce delay.  We hold a wake lock while
1005             // debouncing the sensor.
1006             mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED);
1007             if (positive) {
1008                 mPendingProximity = PROXIMITY_POSITIVE;
1009                 setPendingProximityDebounceTime(
1010                         time + PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY); // acquire wake lock
1011             } else {
1012                 mPendingProximity = PROXIMITY_NEGATIVE;
1013                 setPendingProximityDebounceTime(
1014                         time + PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY); // acquire wake lock
1015             }
1016
1017             // Debounce the new sensor reading.
1018             debounceProximitySensor();
1019         }
1020     }
1021
1022     private void debounceProximitySensor() {
1023         if (mProximitySensorEnabled
1024                 && mPendingProximity != PROXIMITY_UNKNOWN
1025                 && mPendingProximityDebounceTime >= 0) {
1026             final long now = SystemClock.uptimeMillis();
1027             if (mPendingProximityDebounceTime <= now) {
1028                 // Sensor reading accepted.  Apply the change then release the wake lock.
1029                 mProximity = mPendingProximity;
1030                 updatePowerState();
1031                 clearPendingProximityDebounceTime(); // release wake lock (must be last)
1032             } else {
1033                 // Need to wait a little longer.
1034                 // Debounce again later.  We continue holding a wake lock while waiting.
1035                 Message msg = mHandler.obtainMessage(MSG_PROXIMITY_SENSOR_DEBOUNCED);
1036                 msg.setAsynchronous(true);
1037                 mHandler.sendMessageAtTime(msg, mPendingProximityDebounceTime);
1038             }
1039         }
1040     }
1041
1042     private void clearPendingProximityDebounceTime() {
1043         if (mPendingProximityDebounceTime >= 0) {
1044             mPendingProximityDebounceTime = -1;
1045             mCallbacks.releaseSuspendBlocker(); // release wake lock
1046         }
1047     }
1048
1049     private void setPendingProximityDebounceTime(long debounceTime) {
1050         if (mPendingProximityDebounceTime < 0) {
1051             mCallbacks.acquireSuspendBlocker(); // acquire wake lock
1052         }
1053         mPendingProximityDebounceTime = debounceTime;
1054     }
1055
1056     private void sendOnStateChangedWithWakelock() {
1057         mCallbacks.acquireSuspendBlocker();
1058         mHandler.post(mOnStateChangedRunnable);
1059     }
1060
1061     private final Runnable mOnStateChangedRunnable = new Runnable() {
1062         @Override
1063         public void run() {
1064             mCallbacks.onStateChanged();
1065             mCallbacks.releaseSuspendBlocker();
1066         }
1067     };
1068
1069     private void sendOnProximityPositiveWithWakelock() {
1070         mCallbacks.acquireSuspendBlocker();
1071         mHandler.post(mOnProximityPositiveRunnable);
1072     }
1073
1074     private final Runnable mOnProximityPositiveRunnable = new Runnable() {
1075         @Override
1076         public void run() {
1077             mCallbacks.onProximityPositive();
1078             mCallbacks.releaseSuspendBlocker();
1079         }
1080     };
1081
1082     private void sendOnProximityNegativeWithWakelock() {
1083         mCallbacks.acquireSuspendBlocker();
1084         mHandler.post(mOnProximityNegativeRunnable);
1085     }
1086
1087     private final Runnable mOnProximityNegativeRunnable = new Runnable() {
1088         @Override
1089         public void run() {
1090             mCallbacks.onProximityNegative();
1091             mCallbacks.releaseSuspendBlocker();
1092         }
1093     };
1094
1095     public void dump(final PrintWriter pw) {
1096         synchronized (mLock) {
1097             pw.println();
1098             pw.println("Display Power Controller Locked State:");
1099             pw.println("  mDisplayReadyLocked=" + mDisplayReadyLocked);
1100             pw.println("  mPendingRequestLocked=" + mPendingRequestLocked);
1101             pw.println("  mPendingRequestChangedLocked=" + mPendingRequestChangedLocked);
1102             pw.println("  mPendingWaitForNegativeProximityLocked="
1103                     + mPendingWaitForNegativeProximityLocked);
1104             pw.println("  mPendingUpdatePowerStateLocked=" + mPendingUpdatePowerStateLocked);
1105         }
1106
1107         pw.println();
1108         pw.println("Display Power Controller Configuration:");
1109         pw.println("  mScreenBrightnessDozeConfig=" + mScreenBrightnessDozeConfig);
1110         pw.println("  mScreenBrightnessDimConfig=" + mScreenBrightnessDimConfig);
1111         pw.println("  mScreenBrightnessDarkConfig=" + mScreenBrightnessDarkConfig);
1112         pw.println("  mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum);
1113         pw.println("  mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum);
1114         pw.println("  mUseSoftwareAutoBrightnessConfig=" + mUseSoftwareAutoBrightnessConfig);
1115         pw.println("  mAllowAutoBrightnessWhileDozingConfig=" +
1116                 mAllowAutoBrightnessWhileDozingConfig);
1117         pw.println("  mColorFadeFadesConfig=" + mColorFadeFadesConfig);
1118
1119         mHandler.runWithScissors(new Runnable() {
1120             @Override
1121             public void run() {
1122                 dumpLocal(pw);
1123             }
1124         }, 1000);
1125     }
1126
1127     private void dumpLocal(PrintWriter pw) {
1128         pw.println();
1129         pw.println("Display Power Controller Thread State:");
1130         pw.println("  mPowerRequest=" + mPowerRequest);
1131         pw.println("  mWaitingForNegativeProximity=" + mWaitingForNegativeProximity);
1132
1133         pw.println("  mProximitySensor=" + mProximitySensor);
1134         pw.println("  mProximitySensorEnabled=" + mProximitySensorEnabled);
1135         pw.println("  mProximityThreshold=" + mProximityThreshold);
1136         pw.println("  mProximity=" + proximityToString(mProximity));
1137         pw.println("  mPendingProximity=" + proximityToString(mPendingProximity));
1138         pw.println("  mPendingProximityDebounceTime="
1139                 + TimeUtils.formatUptime(mPendingProximityDebounceTime));
1140         pw.println("  mScreenOffBecauseOfProximity=" + mScreenOffBecauseOfProximity);
1141         pw.println("  mAppliedAutoBrightness=" + mAppliedAutoBrightness);
1142         pw.println("  mAppliedDimming=" + mAppliedDimming);
1143         pw.println("  mAppliedLowPower=" + mAppliedLowPower);
1144         pw.println("  mPendingScreenOnUnblocker=" + mPendingScreenOnUnblocker);
1145         pw.println("  mPendingScreenOff=" + mPendingScreenOff);
1146         pw.println("  mReportedToPolicy=" + reportedToPolicyToString(mReportedScreenStateToPolicy));
1147
1148         pw.println("  mScreenBrightnessRampAnimator.isAnimating()=" +
1149                 mScreenBrightnessRampAnimator.isAnimating());
1150
1151         if (mColorFadeOnAnimator != null) {
1152             pw.println("  mColorFadeOnAnimator.isStarted()=" +
1153                     mColorFadeOnAnimator.isStarted());
1154         }
1155         if (mColorFadeOffAnimator != null) {
1156             pw.println("  mColorFadeOffAnimator.isStarted()=" +
1157                     mColorFadeOffAnimator.isStarted());
1158         }
1159
1160         if (mPowerState != null) {
1161             mPowerState.dump(pw);
1162         }
1163
1164         if (mAutomaticBrightnessController != null) {
1165             mAutomaticBrightnessController.dump(pw);
1166         }
1167
1168     }
1169
1170     private static String proximityToString(int state) {
1171         switch (state) {
1172             case PROXIMITY_UNKNOWN:
1173                 return "Unknown";
1174             case PROXIMITY_NEGATIVE:
1175                 return "Negative";
1176             case PROXIMITY_POSITIVE:
1177                 return "Positive";
1178             default:
1179                 return Integer.toString(state);
1180         }
1181     }
1182
1183     private static String reportedToPolicyToString(int state) {
1184         switch (state) {
1185             case REPORTED_TO_POLICY_SCREEN_OFF:
1186                 return "REPORTED_TO_POLICY_SCREEN_OFF";
1187             case REPORTED_TO_POLICY_SCREEN_TURNING_ON:
1188                 return "REPORTED_TO_POLICY_SCREEN_TURNING_ON";
1189             case REPORTED_TO_POLICY_SCREEN_ON:
1190                 return "REPORTED_TO_POLICY_SCREEN_ON";
1191             default:
1192                 return Integer.toString(state);
1193         }
1194     }
1195
1196     private static Spline createAutoBrightnessSpline(int[] lux, int[] brightness) {
1197         try {
1198             final int n = brightness.length;
1199             float[] x = new float[n];
1200             float[] y = new float[n];
1201             y[0] = normalizeAbsoluteBrightness(brightness[0]);
1202             for (int i = 1; i < n; i++) {
1203                 x[i] = lux[i - 1];
1204                 y[i] = normalizeAbsoluteBrightness(brightness[i]);
1205             }
1206
1207             Spline spline = Spline.createSpline(x, y);
1208             if (DEBUG) {
1209                 Slog.d(TAG, "Auto-brightness spline: " + spline);
1210                 for (float v = 1f; v < lux[lux.length - 1] * 1.25f; v *= 1.25f) {
1211                     Slog.d(TAG, String.format("  %7.1f: %7.1f", v, spline.interpolate(v)));
1212                 }
1213             }
1214             return spline;
1215         } catch (IllegalArgumentException ex) {
1216             Slog.e(TAG, "Could not create auto-brightness spline.", ex);
1217             return null;
1218         }
1219     }
1220
1221     private static float normalizeAbsoluteBrightness(int value) {
1222         return (float)clampAbsoluteBrightness(value) / PowerManager.BRIGHTNESS_ON;
1223     }
1224
1225     private static int clampAbsoluteBrightness(int value) {
1226         return MathUtils.constrain(value, PowerManager.BRIGHTNESS_OFF, PowerManager.BRIGHTNESS_ON);
1227     }
1228
1229     private final class DisplayControllerHandler extends Handler {
1230         public DisplayControllerHandler(Looper looper) {
1231             super(looper, null, true /*async*/);
1232         }
1233
1234         @Override
1235         public void handleMessage(Message msg) {
1236             switch (msg.what) {
1237                 case MSG_UPDATE_POWER_STATE:
1238                     updatePowerState();
1239                     break;
1240
1241                 case MSG_PROXIMITY_SENSOR_DEBOUNCED:
1242                     debounceProximitySensor();
1243                     break;
1244
1245                 case MSG_SCREEN_ON_UNBLOCKED:
1246                     if (mPendingScreenOnUnblocker == msg.obj) {
1247                         unblockScreenOn();
1248                         updatePowerState();
1249                     }
1250                     break;
1251             }
1252         }
1253     }
1254
1255     private final SensorEventListener mProximitySensorListener = new SensorEventListener() {
1256         @Override
1257         public void onSensorChanged(SensorEvent event) {
1258             if (mProximitySensorEnabled) {
1259                 final long time = SystemClock.uptimeMillis();
1260                 final float distance = event.values[0];
1261                 boolean positive = distance >= 0.0f && distance < mProximityThreshold;
1262                 handleProximitySensorEvent(time, positive);
1263             }
1264         }
1265
1266         @Override
1267         public void onAccuracyChanged(Sensor sensor, int accuracy) {
1268             // Not used.
1269         }
1270     };
1271
1272     private final class ScreenOnUnblocker implements WindowManagerPolicy.ScreenOnListener {
1273         @Override
1274         public void onScreenOn() {
1275             Message msg = mHandler.obtainMessage(MSG_SCREEN_ON_UNBLOCKED, this);
1276             msg.setAsynchronous(true);
1277             mHandler.sendMessage(msg);
1278         }
1279     }
1280 }