DisplayPowerController.java revision 0a434776b836f8fbea1f84b7bfe158b4ddafc876
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 17package com.android.server.display; 18 19import com.android.internal.app.IBatteryStats; 20import com.android.server.LocalServices; 21import com.android.server.am.BatteryStatsService; 22import com.android.server.lights.LightsManager; 23 24import android.animation.Animator; 25import android.animation.ObjectAnimator; 26import android.content.Context; 27import android.content.res.Resources; 28import android.hardware.Sensor; 29import android.hardware.SensorEvent; 30import android.hardware.SensorEventListener; 31import android.hardware.SensorManager; 32import android.hardware.display.DisplayManagerInternal.DisplayPowerCallbacks; 33import android.hardware.display.DisplayManagerInternal.DisplayPowerRequest; 34import android.os.Handler; 35import android.os.Looper; 36import android.os.Message; 37import android.os.PowerManager; 38import android.os.RemoteException; 39import android.os.SystemClock; 40import android.os.Trace; 41import android.util.MathUtils; 42import android.util.Slog; 43import android.util.Spline; 44import android.util.TimeUtils; 45import android.view.Display; 46import android.view.WindowManagerPolicy; 47 48import 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 */ 72final class DisplayPowerController implements AutomaticBrightnessController.Callbacks { 73 private static final String TAG = "DisplayPowerController"; 74 75 private static boolean DEBUG = false; 76 private static final boolean DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT = false; 77 78 private static final String SCREEN_ON_BLOCKED_TRACE_NAME = "Screen on blocked"; 79 80 // If true, uses the color fade on animation. 81 // We might want to turn this off if we cannot get a guarantee that the screen 82 // actually turns on and starts showing new content after the call to set the 83 // screen state returns. Playing the animation can also be somewhat slow. 84 private static final boolean USE_COLOR_FADE_ON_ANIMATION = false; 85 86 // The minimum reduction in brightness when dimmed. 87 private static final int SCREEN_DIM_MINIMUM_REDUCTION = 10; 88 89 private static final int COLOR_FADE_ON_ANIMATION_DURATION_MILLIS = 250; 90 private static final int COLOR_FADE_OFF_ANIMATION_DURATION_MILLIS = 400; 91 92 private static final int MSG_UPDATE_POWER_STATE = 1; 93 private static final int MSG_PROXIMITY_SENSOR_DEBOUNCED = 2; 94 private static final int MSG_SCREEN_ON_UNBLOCKED = 3; 95 96 private static final int PROXIMITY_UNKNOWN = -1; 97 private static final int PROXIMITY_NEGATIVE = 0; 98 private static final int PROXIMITY_POSITIVE = 1; 99 100 // Proximity sensor debounce delay in milliseconds for positive or negative transitions. 101 private static final int PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY = 0; 102 private static final int PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY = 250; 103 104 // Trigger proximity if distance is less than 5 cm. 105 private static final float TYPICAL_PROXIMITY_THRESHOLD = 5.0f; 106 107 // Brightness animation ramp rate in brightness units per second. 108 private static final int BRIGHTNESS_RAMP_RATE_FAST = 200; 109 private static final int BRIGHTNESS_RAMP_RATE_SLOW = 40; 110 111 private final Object mLock = new Object(); 112 113 private final Context mContext; 114 115 // Our handler. 116 private final DisplayControllerHandler mHandler; 117 118 // Asynchronous callbacks into the power manager service. 119 // Only invoked from the handler thread while no locks are held. 120 private final DisplayPowerCallbacks mCallbacks; 121 122 // Battery stats. 123 private final IBatteryStats mBatteryStats; 124 125 // The lights service. 126 private final LightsManager mLights; 127 128 // The sensor manager. 129 private final SensorManager mSensorManager; 130 131 // The window manager policy. 132 private final WindowManagerPolicy mWindowManagerPolicy; 133 134 // The display blanker. 135 private final DisplayBlanker mBlanker; 136 137 // The proximity sensor, or null if not available or needed. 138 private Sensor mProximitySensor; 139 140 // The doze screen brightness. 141 private final int mScreenBrightnessDozeConfig; 142 143 // The dim screen brightness. 144 private final int mScreenBrightnessDimConfig; 145 146 // The minimum screen brightness to use in a very dark room. 147 private final int mScreenBrightnessDarkConfig; 148 149 // The minimum allowed brightness. 150 private final int mScreenBrightnessRangeMinimum; 151 152 // The maximum allowed brightness. 153 private final int mScreenBrightnessRangeMaximum; 154 155 // True if auto-brightness should be used. 156 private boolean mUseSoftwareAutoBrightnessConfig; 157 158 // True if we should fade the screen while turning it off, false if we should play 159 // a stylish color fade animation instead. 160 private boolean mColorFadeFadesConfig; 161 162 // The pending power request. 163 // Initially null until the first call to requestPowerState. 164 // Guarded by mLock. 165 private DisplayPowerRequest mPendingRequestLocked; 166 167 // True if a request has been made to wait for the proximity sensor to go negative. 168 // Guarded by mLock. 169 private boolean mPendingWaitForNegativeProximityLocked; 170 171 // True if the pending power request or wait for negative proximity flag 172 // has been changed since the last update occurred. 173 // Guarded by mLock. 174 private boolean mPendingRequestChangedLocked; 175 176 // Set to true when the important parts of the pending power request have been applied. 177 // The important parts are mainly the screen state. Brightness changes may occur 178 // concurrently. 179 // Guarded by mLock. 180 private boolean mDisplayReadyLocked; 181 182 // Set to true if a power state update is required. 183 // Guarded by mLock. 184 private boolean mPendingUpdatePowerStateLocked; 185 186 /* The following state must only be accessed by the handler thread. */ 187 188 // The currently requested power state. 189 // The power controller will progressively update its internal state to match 190 // the requested power state. Initially null until the first update. 191 private DisplayPowerRequest mPowerRequest; 192 193 // The current power state. 194 // Must only be accessed on the handler thread. 195 private DisplayPowerState mPowerState; 196 197 // True if the device should wait for negative proximity sensor before 198 // waking up the screen. This is set to false as soon as a negative 199 // proximity sensor measurement is observed or when the device is forced to 200 // go to sleep by the user. While true, the screen remains off. 201 private boolean mWaitingForNegativeProximity; 202 203 // The actual proximity sensor threshold value. 204 private float mProximityThreshold; 205 206 // Set to true if the proximity sensor listener has been registered 207 // with the sensor manager. 208 private boolean mProximitySensorEnabled; 209 210 // The debounced proximity sensor state. 211 private int mProximity = PROXIMITY_UNKNOWN; 212 213 // The raw non-debounced proximity sensor state. 214 private int mPendingProximity = PROXIMITY_UNKNOWN; 215 private long mPendingProximityDebounceTime = -1; // -1 if fully debounced 216 217 // True if the screen was turned off because of the proximity sensor. 218 // When the screen turns on again, we report user activity to the power manager. 219 private boolean mScreenOffBecauseOfProximity; 220 221 // The currently active screen on unblocker. This field is non-null whenever 222 // we are waiting for a callback to release it and unblock the screen. 223 private ScreenOnUnblocker mPendingScreenOnUnblocker; 224 225 // True if we were in the process of turning off the screen. 226 // This allows us to recover more gracefully from situations where we abort 227 // turning off the screen. 228 private boolean mPendingScreenOff; 229 230 // True if we have unfinished business and are holding a suspend blocker. 231 private boolean mUnfinishedBusiness; 232 233 // The elapsed real time when the screen on was blocked. 234 private long mScreenOnBlockStartRealTime; 235 236 // Remembers whether certain kinds of brightness adjustments 237 // were recently applied so that we can decide how to transition. 238 private boolean mAppliedAutoBrightness; 239 private boolean mAppliedDimming; 240 private boolean mAppliedLowPower; 241 242 // The controller for the automatic brightness level. 243 private AutomaticBrightnessController mAutomaticBrightnessController; 244 245 // Animators. 246 private ObjectAnimator mColorFadeOnAnimator; 247 private ObjectAnimator mColorFadeOffAnimator; 248 private RampAnimator<DisplayPowerState> mScreenBrightnessRampAnimator; 249 250 /** 251 * Creates the display power controller. 252 */ 253 public DisplayPowerController(Context context, 254 DisplayPowerCallbacks callbacks, Handler handler, 255 SensorManager sensorManager, DisplayBlanker blanker) { 256 mHandler = new DisplayControllerHandler(handler.getLooper()); 257 mCallbacks = callbacks; 258 259 mBatteryStats = BatteryStatsService.getService(); 260 mLights = LocalServices.getService(LightsManager.class); 261 mSensorManager = sensorManager; 262 mWindowManagerPolicy = LocalServices.getService(WindowManagerPolicy.class); 263 mBlanker = blanker; 264 mContext = context; 265 266 final Resources resources = context.getResources(); 267 final int screenBrightnessSettingMinimum = clampAbsoluteBrightness(resources.getInteger( 268 com.android.internal.R.integer.config_screenBrightnessSettingMinimum)); 269 270 mScreenBrightnessDozeConfig = clampAbsoluteBrightness(resources.getInteger( 271 com.android.internal.R.integer.config_screenBrightnessDoze)); 272 273 mScreenBrightnessDimConfig = clampAbsoluteBrightness(resources.getInteger( 274 com.android.internal.R.integer.config_screenBrightnessDim)); 275 276 mScreenBrightnessDarkConfig = clampAbsoluteBrightness(resources.getInteger( 277 com.android.internal.R.integer.config_screenBrightnessDark)); 278 if (mScreenBrightnessDarkConfig > mScreenBrightnessDimConfig) { 279 Slog.w(TAG, "Expected config_screenBrightnessDark (" 280 + mScreenBrightnessDarkConfig + ") to be less than or equal to " 281 + "config_screenBrightnessDim (" + mScreenBrightnessDimConfig + ")."); 282 } 283 if (mScreenBrightnessDarkConfig > mScreenBrightnessDimConfig) { 284 Slog.w(TAG, "Expected config_screenBrightnessDark (" 285 + mScreenBrightnessDarkConfig + ") to be less than or equal to " 286 + "config_screenBrightnessSettingMinimum (" 287 + screenBrightnessSettingMinimum + ")."); 288 } 289 290 int screenBrightnessRangeMinimum = Math.min(Math.min( 291 screenBrightnessSettingMinimum, mScreenBrightnessDimConfig), 292 mScreenBrightnessDarkConfig); 293 294 mScreenBrightnessRangeMaximum = PowerManager.BRIGHTNESS_ON; 295 296 mUseSoftwareAutoBrightnessConfig = resources.getBoolean( 297 com.android.internal.R.bool.config_automatic_brightness_available); 298 if (mUseSoftwareAutoBrightnessConfig) { 299 int[] lux = resources.getIntArray( 300 com.android.internal.R.array.config_autoBrightnessLevels); 301 int[] screenBrightness = resources.getIntArray( 302 com.android.internal.R.array.config_autoBrightnessLcdBacklightValues); 303 int lightSensorWarmUpTimeConfig = resources.getInteger( 304 com.android.internal.R.integer.config_lightSensorWarmupTime); 305 306 Spline screenAutoBrightnessSpline = createAutoBrightnessSpline(lux, screenBrightness); 307 if (screenAutoBrightnessSpline == null) { 308 Slog.e(TAG, "Error in config.xml. config_autoBrightnessLcdBacklightValues " 309 + "(size " + screenBrightness.length + ") " 310 + "must be monotic and have exactly one more entry than " 311 + "config_autoBrightnessLevels (size " + lux.length + ") " 312 + "which must be strictly increasing. " 313 + "Auto-brightness will be disabled."); 314 mUseSoftwareAutoBrightnessConfig = false; 315 } else { 316 int bottom = clampAbsoluteBrightness(screenBrightness[0]); 317 if (mScreenBrightnessDarkConfig > bottom) { 318 Slog.w(TAG, "config_screenBrightnessDark (" + mScreenBrightnessDarkConfig 319 + ") should be less than or equal to the first value of " 320 + "config_autoBrightnessLcdBacklightValues (" 321 + bottom + ")."); 322 } 323 if (bottom < screenBrightnessRangeMinimum) { 324 screenBrightnessRangeMinimum = bottom; 325 } 326 mAutomaticBrightnessController = new AutomaticBrightnessController(this, 327 handler.getLooper(), sensorManager, screenAutoBrightnessSpline, 328 lightSensorWarmUpTimeConfig, screenBrightnessRangeMinimum, 329 mScreenBrightnessRangeMaximum); 330 } 331 } 332 333 mScreenBrightnessRangeMinimum = screenBrightnessRangeMinimum; 334 335 mColorFadeFadesConfig = resources.getBoolean( 336 com.android.internal.R.bool.config_animateScreenLights); 337 338 if (!DEBUG_PRETEND_PROXIMITY_SENSOR_ABSENT) { 339 mProximitySensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY); 340 if (mProximitySensor != null) { 341 mProximityThreshold = Math.min(mProximitySensor.getMaximumRange(), 342 TYPICAL_PROXIMITY_THRESHOLD); 343 } 344 } 345 346 } 347 348 /** 349 * Returns true if the proximity sensor screen-off function is available. 350 */ 351 public boolean isProximitySensorAvailable() { 352 return mProximitySensor != null; 353 } 354 355 /** 356 * Requests a new power state. 357 * The controller makes a copy of the provided object and then 358 * begins adjusting the power state to match what was requested. 359 * 360 * @param request The requested power state. 361 * @param waitForNegativeProximity If true, issues a request to wait for 362 * negative proximity before turning the screen back on, assuming the screen 363 * was turned off by the proximity sensor. 364 * @return True if display is ready, false if there are important changes that must 365 * be made asynchronously (such as turning the screen on), in which case the caller 366 * should grab a wake lock, watch for {@link DisplayPowerCallbacks#onStateChanged()} 367 * then try the request again later until the state converges. 368 */ 369 public boolean requestPowerState(DisplayPowerRequest request, 370 boolean waitForNegativeProximity) { 371 if (DEBUG) { 372 Slog.d(TAG, "requestPowerState: " 373 + request + ", waitForNegativeProximity=" + waitForNegativeProximity); 374 } 375 376 synchronized (mLock) { 377 boolean changed = false; 378 379 if (waitForNegativeProximity 380 && !mPendingWaitForNegativeProximityLocked) { 381 mPendingWaitForNegativeProximityLocked = true; 382 changed = true; 383 } 384 385 if (mPendingRequestLocked == null) { 386 mPendingRequestLocked = new DisplayPowerRequest(request); 387 changed = true; 388 } else if (!mPendingRequestLocked.equals(request)) { 389 mPendingRequestLocked.copyFrom(request); 390 changed = true; 391 } 392 393 if (changed) { 394 mDisplayReadyLocked = false; 395 } 396 397 if (changed && !mPendingRequestChangedLocked) { 398 mPendingRequestChangedLocked = true; 399 sendUpdatePowerStateLocked(); 400 } 401 402 return mDisplayReadyLocked; 403 } 404 } 405 406 private void sendUpdatePowerState() { 407 synchronized (mLock) { 408 sendUpdatePowerStateLocked(); 409 } 410 } 411 412 private void sendUpdatePowerStateLocked() { 413 if (!mPendingUpdatePowerStateLocked) { 414 mPendingUpdatePowerStateLocked = true; 415 Message msg = mHandler.obtainMessage(MSG_UPDATE_POWER_STATE); 416 msg.setAsynchronous(true); 417 mHandler.sendMessage(msg); 418 } 419 } 420 421 private void initialize() { 422 // Initialize the power state object for the default display. 423 // In the future, we might manage multiple displays independently. 424 mPowerState = new DisplayPowerState(mBlanker, 425 mLights.getLight(LightsManager.LIGHT_ID_BACKLIGHT), 426 new ColorFade(Display.DEFAULT_DISPLAY)); 427 428 mColorFadeOnAnimator = ObjectAnimator.ofFloat( 429 mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 0.0f, 1.0f); 430 mColorFadeOnAnimator.setDuration(COLOR_FADE_ON_ANIMATION_DURATION_MILLIS); 431 mColorFadeOnAnimator.addListener(mAnimatorListener); 432 433 mColorFadeOffAnimator = ObjectAnimator.ofFloat( 434 mPowerState, DisplayPowerState.COLOR_FADE_LEVEL, 1.0f, 0.0f); 435 mColorFadeOffAnimator.setDuration(COLOR_FADE_OFF_ANIMATION_DURATION_MILLIS); 436 mColorFadeOffAnimator.addListener(mAnimatorListener); 437 438 mScreenBrightnessRampAnimator = new RampAnimator<DisplayPowerState>( 439 mPowerState, DisplayPowerState.SCREEN_BRIGHTNESS); 440 mScreenBrightnessRampAnimator.setListener(mRampAnimatorListener); 441 442 // Initialize screen state for battery stats. 443 try { 444 mBatteryStats.noteScreenState(mPowerState.getScreenState()); 445 mBatteryStats.noteScreenBrightness(mPowerState.getScreenBrightness()); 446 } catch (RemoteException ex) { 447 // same process 448 } 449 } 450 451 private final Animator.AnimatorListener mAnimatorListener = new Animator.AnimatorListener() { 452 @Override 453 public void onAnimationStart(Animator animation) { 454 } 455 @Override 456 public void onAnimationEnd(Animator animation) { 457 sendUpdatePowerState(); 458 } 459 @Override 460 public void onAnimationRepeat(Animator animation) { 461 } 462 @Override 463 public void onAnimationCancel(Animator animation) { 464 } 465 }; 466 467 private final RampAnimator.Listener mRampAnimatorListener = new RampAnimator.Listener() { 468 @Override 469 public void onAnimationEnd() { 470 sendUpdatePowerState(); 471 } 472 }; 473 474 private void updatePowerState() { 475 // Update the power state request. 476 final boolean mustNotify; 477 boolean mustInitialize = false; 478 boolean autoBrightnessAdjustmentChanged = false; 479 480 synchronized (mLock) { 481 mPendingUpdatePowerStateLocked = false; 482 if (mPendingRequestLocked == null) { 483 return; // wait until first actual power request 484 } 485 486 if (mPowerRequest == null) { 487 mPowerRequest = new DisplayPowerRequest(mPendingRequestLocked); 488 mWaitingForNegativeProximity = mPendingWaitForNegativeProximityLocked; 489 mPendingWaitForNegativeProximityLocked = false; 490 mPendingRequestChangedLocked = false; 491 mustInitialize = true; 492 } else if (mPendingRequestChangedLocked) { 493 autoBrightnessAdjustmentChanged = (mPowerRequest.screenAutoBrightnessAdjustment 494 != mPendingRequestLocked.screenAutoBrightnessAdjustment); 495 mPowerRequest.copyFrom(mPendingRequestLocked); 496 mWaitingForNegativeProximity |= mPendingWaitForNegativeProximityLocked; 497 mPendingWaitForNegativeProximityLocked = false; 498 mPendingRequestChangedLocked = false; 499 mDisplayReadyLocked = false; 500 } 501 502 mustNotify = !mDisplayReadyLocked; 503 } 504 505 // Initialize things the first time the power state is changed. 506 if (mustInitialize) { 507 initialize(); 508 } 509 510 // Compute the basic display state using the policy. 511 // We might override this below based on other factors. 512 int state; 513 int brightness = PowerManager.BRIGHTNESS_DEFAULT; 514 boolean performScreenOffTransition = false; 515 switch (mPowerRequest.policy) { 516 case DisplayPowerRequest.POLICY_OFF: 517 state = Display.STATE_OFF; 518 performScreenOffTransition = true; 519 break; 520 case DisplayPowerRequest.POLICY_DOZE: 521 if (mPowerRequest.dozeScreenState != Display.STATE_UNKNOWN) { 522 state = mPowerRequest.dozeScreenState; 523 } else { 524 state = Display.STATE_DOZE; 525 } 526 brightness = mPowerRequest.dozeScreenBrightness; 527 break; 528 case DisplayPowerRequest.POLICY_DIM: 529 case DisplayPowerRequest.POLICY_BRIGHT: 530 default: 531 state = Display.STATE_ON; 532 break; 533 } 534 assert(state != Display.STATE_UNKNOWN); 535 536 // Apply the proximity sensor. 537 if (mProximitySensor != null) { 538 if (mPowerRequest.useProximitySensor && state != Display.STATE_OFF) { 539 setProximitySensorEnabled(true); 540 if (!mScreenOffBecauseOfProximity 541 && mProximity == PROXIMITY_POSITIVE) { 542 mScreenOffBecauseOfProximity = true; 543 sendOnProximityPositiveWithWakelock(); 544 } 545 } else if (mWaitingForNegativeProximity 546 && mScreenOffBecauseOfProximity 547 && mProximity == PROXIMITY_POSITIVE 548 && state != Display.STATE_OFF) { 549 setProximitySensorEnabled(true); 550 } else { 551 setProximitySensorEnabled(false); 552 mWaitingForNegativeProximity = false; 553 } 554 if (mScreenOffBecauseOfProximity 555 && mProximity != PROXIMITY_POSITIVE) { 556 mScreenOffBecauseOfProximity = false; 557 sendOnProximityNegativeWithWakelock(); 558 } 559 } else { 560 mWaitingForNegativeProximity = false; 561 } 562 if (mScreenOffBecauseOfProximity) { 563 state = Display.STATE_OFF; 564 } 565 566 // Use zero brightness when screen is off. 567 if (state == Display.STATE_OFF) { 568 brightness = PowerManager.BRIGHTNESS_OFF; 569 } 570 571 // Use default brightness when dozing unless overridden. 572 if (brightness < 0 && (state == Display.STATE_DOZE 573 || state == Display.STATE_DOZE_SUSPEND)) { 574 brightness = mScreenBrightnessDozeConfig; 575 } 576 577 // Configure auto-brightness. 578 boolean autoBrightnessEnabled = false; 579 if (mAutomaticBrightnessController != null) { 580 autoBrightnessEnabled = mPowerRequest.useAutoBrightness 581 && state == Display.STATE_ON && brightness < 0; 582 mAutomaticBrightnessController.configure(autoBrightnessEnabled, 583 mPowerRequest.screenAutoBrightnessAdjustment); 584 } 585 586 // Apply auto-brightness. 587 boolean slowChange = false; 588 if (brightness < 0) { 589 if (autoBrightnessEnabled) { 590 brightness = mAutomaticBrightnessController.getAutomaticScreenBrightness(); 591 } 592 if (brightness >= 0) { 593 // Use current auto-brightness value and slowly adjust to changes. 594 brightness = clampScreenBrightness(brightness); 595 if (mAppliedAutoBrightness && !autoBrightnessAdjustmentChanged) { 596 slowChange = true; // slowly adapt to auto-brightness 597 } 598 mAppliedAutoBrightness = true; 599 } else { 600 mAppliedAutoBrightness = false; 601 } 602 } else { 603 mAppliedAutoBrightness = false; 604 } 605 606 // Apply manual brightness. 607 // Use the current brightness setting from the request, which is expected 608 // provide a nominal default value for the case where auto-brightness 609 // is not ready yet. 610 if (brightness < 0) { 611 brightness = clampScreenBrightness(mPowerRequest.screenBrightness); 612 } 613 614 // Apply dimming by at least some minimum amount when user activity 615 // timeout is about to expire. 616 if (mPowerRequest.policy == DisplayPowerRequest.POLICY_DIM) { 617 if (brightness > mScreenBrightnessRangeMinimum) { 618 brightness = Math.max(Math.min(brightness - SCREEN_DIM_MINIMUM_REDUCTION, 619 mScreenBrightnessDimConfig), mScreenBrightnessRangeMinimum); 620 } 621 if (!mAppliedDimming) { 622 slowChange = false; 623 } 624 mAppliedDimming = true; 625 } 626 627 // If low power mode is enabled, cut the brightness level by half 628 // as long as it is above the minimum threshold. 629 if (mPowerRequest.lowPowerMode) { 630 if (brightness > mScreenBrightnessRangeMinimum) { 631 brightness = Math.max(brightness / 2, mScreenBrightnessRangeMinimum); 632 } 633 if (!mAppliedLowPower) { 634 slowChange = false; 635 } 636 mAppliedLowPower = true; 637 } 638 639 // Animate the screen state change unless already animating. 640 animateScreenStateChange(state, performScreenOffTransition); 641 642 // Animate the screen brightness when the screen is on or dozing. 643 // Skip the animation when the screen is off or suspended. 644 final int actualState = mPowerState.getScreenState(); 645 if (actualState == Display.STATE_ON || actualState == Display.STATE_DOZE) { 646 animateScreenBrightness(brightness, 647 slowChange ? BRIGHTNESS_RAMP_RATE_SLOW : BRIGHTNESS_RAMP_RATE_FAST); 648 } else { 649 animateScreenBrightness(brightness, 0); 650 } 651 652 // Determine whether the display is ready for use in the newly requested state. 653 // Note that we do not wait for the brightness ramp animation to complete before 654 // reporting the display is ready because we only need to ensure the screen is in the 655 // right power state even as it continues to converge on the desired brightness. 656 final boolean ready = mPendingScreenOnUnblocker == null 657 && !mColorFadeOnAnimator.isStarted() 658 && !mColorFadeOffAnimator.isStarted() 659 && mPowerState.waitUntilClean(mCleanListener); 660 final boolean finished = ready 661 && !mScreenBrightnessRampAnimator.isAnimating(); 662 663 // Grab a wake lock if we have unfinished business. 664 if (!finished && !mUnfinishedBusiness) { 665 if (DEBUG) { 666 Slog.d(TAG, "Unfinished business..."); 667 } 668 mCallbacks.acquireSuspendBlocker(); 669 mUnfinishedBusiness = true; 670 } 671 672 // Notify the power manager when ready. 673 if (ready && mustNotify) { 674 // Send state change. 675 synchronized (mLock) { 676 if (!mPendingRequestChangedLocked) { 677 mDisplayReadyLocked = true; 678 679 if (DEBUG) { 680 Slog.d(TAG, "Display ready!"); 681 } 682 } 683 } 684 sendOnStateChangedWithWakelock(); 685 } 686 687 // Release the wake lock when we have no unfinished business. 688 if (finished && mUnfinishedBusiness) { 689 if (DEBUG) { 690 Slog.d(TAG, "Finished business..."); 691 } 692 mUnfinishedBusiness = false; 693 mCallbacks.releaseSuspendBlocker(); 694 } 695 } 696 697 @Override 698 public void updateBrightness() { 699 sendUpdatePowerState(); 700 } 701 702 private void blockScreenOn() { 703 if (mPendingScreenOnUnblocker == null) { 704 Trace.asyncTraceBegin(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0); 705 mPendingScreenOnUnblocker = new ScreenOnUnblocker(); 706 mScreenOnBlockStartRealTime = SystemClock.elapsedRealtime(); 707 Slog.i(TAG, "Blocking screen on until initial contents have been drawn."); 708 } 709 } 710 711 private void unblockScreenOn() { 712 if (mPendingScreenOnUnblocker != null) { 713 mPendingScreenOnUnblocker = null; 714 long delay = SystemClock.elapsedRealtime() - mScreenOnBlockStartRealTime; 715 Slog.i(TAG, "Unblocked screen on after " + delay + " ms"); 716 Trace.asyncTraceEnd(Trace.TRACE_TAG_POWER, SCREEN_ON_BLOCKED_TRACE_NAME, 0); 717 } 718 } 719 720 private boolean setScreenState(int state) { 721 if (mPowerState.getScreenState() != state) { 722 final boolean wasOn = (mPowerState.getScreenState() != Display.STATE_OFF); 723 mPowerState.setScreenState(state); 724 725 // Tell battery stats about the transition. 726 try { 727 mBatteryStats.noteScreenState(state); 728 } catch (RemoteException ex) { 729 // same process 730 } 731 732 // Tell the window manager what's happening. 733 // Temporarily block turning the screen on until the window manager is ready 734 // by leaving a black surface covering the screen. This surface is essentially 735 // the final state of the color fade animation. 736 boolean isOn = (state != Display.STATE_OFF); 737 if (wasOn && !isOn) { 738 unblockScreenOn(); 739 mWindowManagerPolicy.screenTurnedOff(); 740 } else if (!wasOn && isOn) { 741 if (mPowerState.getColorFadeLevel() == 0.0f) { 742 blockScreenOn(); 743 } else { 744 unblockScreenOn(); 745 } 746 mWindowManagerPolicy.screenTurningOn(mPendingScreenOnUnblocker); 747 } 748 } 749 return mPendingScreenOnUnblocker == null; 750 } 751 752 private int clampScreenBrightness(int value) { 753 return MathUtils.constrain( 754 value, mScreenBrightnessRangeMinimum, mScreenBrightnessRangeMaximum); 755 } 756 757 private void animateScreenBrightness(int target, int rate) { 758 if (DEBUG) { 759 Slog.d(TAG, "Animating brightness: target=" + target +", rate=" + rate); 760 } 761 if (mScreenBrightnessRampAnimator.animateTo(target, rate)) { 762 try { 763 mBatteryStats.noteScreenBrightness(target); 764 } catch (RemoteException ex) { 765 // same process 766 } 767 } 768 } 769 770 private void animateScreenStateChange(int target, boolean performScreenOffTransition) { 771 // If there is already an animation in progress, don't interfere with it. 772 if (mColorFadeOnAnimator.isStarted() 773 || mColorFadeOffAnimator.isStarted()) { 774 return; 775 } 776 777 // If we were in the process of turning off the screen but didn't quite 778 // finish. Then finish up now to prevent a jarring transition back 779 // to screen on if we skipped blocking screen on as usual. 780 if (mPendingScreenOff && target != Display.STATE_OFF) { 781 setScreenState(Display.STATE_OFF); 782 mPendingScreenOff = false; 783 } 784 785 if (target == Display.STATE_ON) { 786 // Want screen on. The contents of the screen may not yet 787 // be visible if the color fade has not been dismissed because 788 // its last frame of animation is solid black. 789 if (!setScreenState(Display.STATE_ON)) { 790 return; // screen on blocked 791 } 792 if (USE_COLOR_FADE_ON_ANIMATION && mPowerRequest.isBrightOrDim()) { 793 // Perform screen on animation. 794 if (mPowerState.getColorFadeLevel() == 1.0f) { 795 mPowerState.dismissColorFade(); 796 } else if (mPowerState.prepareColorFade(mContext, 797 mColorFadeFadesConfig ? 798 ColorFade.MODE_FADE : 799 ColorFade.MODE_WARM_UP)) { 800 mColorFadeOnAnimator.start(); 801 } else { 802 mColorFadeOnAnimator.end(); 803 } 804 } else { 805 // Skip screen on animation. 806 mPowerState.setColorFadeLevel(1.0f); 807 mPowerState.dismissColorFade(); 808 } 809 } else if (target == Display.STATE_DOZE) { 810 // Want screen dozing. 811 // Wait for brightness animation to complete beforehand when entering doze 812 // from screen on to prevent a perceptible jump because brightness may operate 813 // differently when the display is configured for dozing. 814 if (mScreenBrightnessRampAnimator.isAnimating() 815 && mPowerState.getScreenState() == Display.STATE_ON) { 816 return; 817 } 818 819 // Set screen state. 820 if (!setScreenState(Display.STATE_DOZE)) { 821 return; // screen on blocked 822 } 823 824 // Dismiss the black surface without fanfare. 825 mPowerState.setColorFadeLevel(1.0f); 826 mPowerState.dismissColorFade(); 827 } else if (target == Display.STATE_DOZE_SUSPEND) { 828 // Want screen dozing and suspended. 829 // Wait for brightness animation to complete beforehand unless already 830 // suspended because we may not be able to change it after suspension. 831 if (mScreenBrightnessRampAnimator.isAnimating() 832 && mPowerState.getScreenState() != Display.STATE_DOZE_SUSPEND) { 833 return; 834 } 835 836 // If not already suspending, temporarily set the state to doze until the 837 // screen on is unblocked, then suspend. 838 if (mPowerState.getScreenState() != Display.STATE_DOZE_SUSPEND) { 839 if (!setScreenState(Display.STATE_DOZE)) { 840 return; // screen on blocked 841 } 842 setScreenState(Display.STATE_DOZE_SUSPEND); // already on so can't block 843 } 844 845 // Dismiss the black surface without fanfare. 846 mPowerState.setColorFadeLevel(1.0f); 847 mPowerState.dismissColorFade(); 848 } else { 849 // Want screen off. 850 mPendingScreenOff = true; 851 if (mPowerState.getColorFadeLevel() == 0.0f) { 852 // Turn the screen off. 853 // A black surface is already hiding the contents of the screen. 854 setScreenState(Display.STATE_OFF); 855 mPendingScreenOff = false; 856 } else if (performScreenOffTransition 857 && mPowerState.prepareColorFade(mContext, 858 mColorFadeFadesConfig ? 859 ColorFade.MODE_FADE : ColorFade.MODE_COOL_DOWN) 860 && mPowerState.getScreenState() != Display.STATE_OFF) { 861 // Perform the screen off animation. 862 mColorFadeOffAnimator.start(); 863 } else { 864 // Skip the screen off animation and add a black surface to hide the 865 // contents of the screen. 866 mColorFadeOffAnimator.end(); 867 } 868 } 869 } 870 871 private final Runnable mCleanListener = new Runnable() { 872 @Override 873 public void run() { 874 sendUpdatePowerState(); 875 } 876 }; 877 878 private void setProximitySensorEnabled(boolean enable) { 879 if (enable) { 880 if (!mProximitySensorEnabled) { 881 // Register the listener. 882 // Proximity sensor state already cleared initially. 883 mProximitySensorEnabled = true; 884 mSensorManager.registerListener(mProximitySensorListener, mProximitySensor, 885 SensorManager.SENSOR_DELAY_NORMAL, mHandler); 886 } 887 } else { 888 if (mProximitySensorEnabled) { 889 // Unregister the listener. 890 // Clear the proximity sensor state for next time. 891 mProximitySensorEnabled = false; 892 mProximity = PROXIMITY_UNKNOWN; 893 mPendingProximity = PROXIMITY_UNKNOWN; 894 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 895 mSensorManager.unregisterListener(mProximitySensorListener); 896 clearPendingProximityDebounceTime(); // release wake lock (must be last) 897 } 898 } 899 } 900 901 private void handleProximitySensorEvent(long time, boolean positive) { 902 if (mProximitySensorEnabled) { 903 if (mPendingProximity == PROXIMITY_NEGATIVE && !positive) { 904 return; // no change 905 } 906 if (mPendingProximity == PROXIMITY_POSITIVE && positive) { 907 return; // no change 908 } 909 910 // Only accept a proximity sensor reading if it remains 911 // stable for the entire debounce delay. We hold a wake lock while 912 // debouncing the sensor. 913 mHandler.removeMessages(MSG_PROXIMITY_SENSOR_DEBOUNCED); 914 if (positive) { 915 mPendingProximity = PROXIMITY_POSITIVE; 916 setPendingProximityDebounceTime( 917 time + PROXIMITY_SENSOR_POSITIVE_DEBOUNCE_DELAY); // acquire wake lock 918 } else { 919 mPendingProximity = PROXIMITY_NEGATIVE; 920 setPendingProximityDebounceTime( 921 time + PROXIMITY_SENSOR_NEGATIVE_DEBOUNCE_DELAY); // acquire wake lock 922 } 923 924 // Debounce the new sensor reading. 925 debounceProximitySensor(); 926 } 927 } 928 929 private void debounceProximitySensor() { 930 if (mProximitySensorEnabled 931 && mPendingProximity != PROXIMITY_UNKNOWN 932 && mPendingProximityDebounceTime >= 0) { 933 final long now = SystemClock.uptimeMillis(); 934 if (mPendingProximityDebounceTime <= now) { 935 // Sensor reading accepted. Apply the change then release the wake lock. 936 mProximity = mPendingProximity; 937 updatePowerState(); 938 clearPendingProximityDebounceTime(); // release wake lock (must be last) 939 } else { 940 // Need to wait a little longer. 941 // Debounce again later. We continue holding a wake lock while waiting. 942 Message msg = mHandler.obtainMessage(MSG_PROXIMITY_SENSOR_DEBOUNCED); 943 msg.setAsynchronous(true); 944 mHandler.sendMessageAtTime(msg, mPendingProximityDebounceTime); 945 } 946 } 947 } 948 949 private void clearPendingProximityDebounceTime() { 950 if (mPendingProximityDebounceTime >= 0) { 951 mPendingProximityDebounceTime = -1; 952 mCallbacks.releaseSuspendBlocker(); // release wake lock 953 } 954 } 955 956 private void setPendingProximityDebounceTime(long debounceTime) { 957 if (mPendingProximityDebounceTime < 0) { 958 mCallbacks.acquireSuspendBlocker(); // acquire wake lock 959 } 960 mPendingProximityDebounceTime = debounceTime; 961 } 962 963 private void sendOnStateChangedWithWakelock() { 964 mCallbacks.acquireSuspendBlocker(); 965 mHandler.post(mOnStateChangedRunnable); 966 } 967 968 private final Runnable mOnStateChangedRunnable = new Runnable() { 969 @Override 970 public void run() { 971 mCallbacks.onStateChanged(); 972 mCallbacks.releaseSuspendBlocker(); 973 } 974 }; 975 976 private void sendOnProximityPositiveWithWakelock() { 977 mCallbacks.acquireSuspendBlocker(); 978 mHandler.post(mOnProximityPositiveRunnable); 979 } 980 981 private final Runnable mOnProximityPositiveRunnable = new Runnable() { 982 @Override 983 public void run() { 984 mCallbacks.onProximityPositive(); 985 mCallbacks.releaseSuspendBlocker(); 986 } 987 }; 988 989 private void sendOnProximityNegativeWithWakelock() { 990 mCallbacks.acquireSuspendBlocker(); 991 mHandler.post(mOnProximityNegativeRunnable); 992 } 993 994 private final Runnable mOnProximityNegativeRunnable = new Runnable() { 995 @Override 996 public void run() { 997 mCallbacks.onProximityNegative(); 998 mCallbacks.releaseSuspendBlocker(); 999 } 1000 }; 1001 1002 public void dump(final PrintWriter pw) { 1003 synchronized (mLock) { 1004 pw.println(); 1005 pw.println("Display Power Controller Locked State:"); 1006 pw.println(" mDisplayReadyLocked=" + mDisplayReadyLocked); 1007 pw.println(" mPendingRequestLocked=" + mPendingRequestLocked); 1008 pw.println(" mPendingRequestChangedLocked=" + mPendingRequestChangedLocked); 1009 pw.println(" mPendingWaitForNegativeProximityLocked=" 1010 + mPendingWaitForNegativeProximityLocked); 1011 pw.println(" mPendingUpdatePowerStateLocked=" + mPendingUpdatePowerStateLocked); 1012 } 1013 1014 pw.println(); 1015 pw.println("Display Power Controller Configuration:"); 1016 pw.println(" mScreenBrightnessDozeConfig=" + mScreenBrightnessDozeConfig); 1017 pw.println(" mScreenBrightnessDimConfig=" + mScreenBrightnessDimConfig); 1018 pw.println(" mScreenBrightnessDarkConfig=" + mScreenBrightnessDarkConfig); 1019 pw.println(" mScreenBrightnessRangeMinimum=" + mScreenBrightnessRangeMinimum); 1020 pw.println(" mScreenBrightnessRangeMaximum=" + mScreenBrightnessRangeMaximum); 1021 pw.println(" mUseSoftwareAutoBrightnessConfig=" + mUseSoftwareAutoBrightnessConfig); 1022 pw.println(" mColorFadeFadesConfig=" + mColorFadeFadesConfig); 1023 1024 mHandler.runWithScissors(new Runnable() { 1025 @Override 1026 public void run() { 1027 dumpLocal(pw); 1028 } 1029 }, 1000); 1030 } 1031 1032 private void dumpLocal(PrintWriter pw) { 1033 pw.println(); 1034 pw.println("Display Power Controller Thread State:"); 1035 pw.println(" mPowerRequest=" + mPowerRequest); 1036 pw.println(" mWaitingForNegativeProximity=" + mWaitingForNegativeProximity); 1037 1038 pw.println(" mProximitySensor=" + mProximitySensor); 1039 pw.println(" mProximitySensorEnabled=" + mProximitySensorEnabled); 1040 pw.println(" mProximityThreshold=" + mProximityThreshold); 1041 pw.println(" mProximity=" + proximityToString(mProximity)); 1042 pw.println(" mPendingProximity=" + proximityToString(mPendingProximity)); 1043 pw.println(" mPendingProximityDebounceTime=" 1044 + TimeUtils.formatUptime(mPendingProximityDebounceTime)); 1045 pw.println(" mScreenOffBecauseOfProximity=" + mScreenOffBecauseOfProximity); 1046 pw.println(" mAppliedAutoBrightness=" + mAppliedAutoBrightness); 1047 pw.println(" mAppliedDimming=" + mAppliedDimming); 1048 pw.println(" mAppliedLowPower=" + mAppliedLowPower); 1049 pw.println(" mPendingScreenOnUnblocker=" + mPendingScreenOnUnblocker); 1050 pw.println(" mPendingScreenOff=" + mPendingScreenOff); 1051 1052 pw.println(" mScreenBrightnessRampAnimator.isAnimating()=" + 1053 mScreenBrightnessRampAnimator.isAnimating()); 1054 1055 if (mColorFadeOnAnimator != null) { 1056 pw.println(" mColorFadeOnAnimator.isStarted()=" + 1057 mColorFadeOnAnimator.isStarted()); 1058 } 1059 if (mColorFadeOffAnimator != null) { 1060 pw.println(" mColorFadeOffAnimator.isStarted()=" + 1061 mColorFadeOffAnimator.isStarted()); 1062 } 1063 1064 if (mPowerState != null) { 1065 mPowerState.dump(pw); 1066 } 1067 1068 if (mAutomaticBrightnessController != null) { 1069 mAutomaticBrightnessController.dump(pw); 1070 } 1071 1072 } 1073 1074 private static String proximityToString(int state) { 1075 switch (state) { 1076 case PROXIMITY_UNKNOWN: 1077 return "Unknown"; 1078 case PROXIMITY_NEGATIVE: 1079 return "Negative"; 1080 case PROXIMITY_POSITIVE: 1081 return "Positive"; 1082 default: 1083 return Integer.toString(state); 1084 } 1085 } 1086 1087 private static Spline createAutoBrightnessSpline(int[] lux, int[] brightness) { 1088 try { 1089 final int n = brightness.length; 1090 float[] x = new float[n]; 1091 float[] y = new float[n]; 1092 y[0] = normalizeAbsoluteBrightness(brightness[0]); 1093 for (int i = 1; i < n; i++) { 1094 x[i] = lux[i - 1]; 1095 y[i] = normalizeAbsoluteBrightness(brightness[i]); 1096 } 1097 1098 Spline spline = Spline.createSpline(x, y); 1099 if (DEBUG) { 1100 Slog.d(TAG, "Auto-brightness spline: " + spline); 1101 for (float v = 1f; v < lux[lux.length - 1] * 1.25f; v *= 1.25f) { 1102 Slog.d(TAG, String.format(" %7.1f: %7.1f", v, spline.interpolate(v))); 1103 } 1104 } 1105 return spline; 1106 } catch (IllegalArgumentException ex) { 1107 Slog.e(TAG, "Could not create auto-brightness spline.", ex); 1108 return null; 1109 } 1110 } 1111 1112 private static float normalizeAbsoluteBrightness(int value) { 1113 return (float)clampAbsoluteBrightness(value) / PowerManager.BRIGHTNESS_ON; 1114 } 1115 1116 private static int clampAbsoluteBrightness(int value) { 1117 return MathUtils.constrain(value, PowerManager.BRIGHTNESS_OFF, PowerManager.BRIGHTNESS_ON); 1118 } 1119 1120 private final class DisplayControllerHandler extends Handler { 1121 public DisplayControllerHandler(Looper looper) { 1122 super(looper, null, true /*async*/); 1123 } 1124 1125 @Override 1126 public void handleMessage(Message msg) { 1127 switch (msg.what) { 1128 case MSG_UPDATE_POWER_STATE: 1129 updatePowerState(); 1130 break; 1131 1132 case MSG_PROXIMITY_SENSOR_DEBOUNCED: 1133 debounceProximitySensor(); 1134 break; 1135 1136 case MSG_SCREEN_ON_UNBLOCKED: 1137 if (mPendingScreenOnUnblocker == msg.obj) { 1138 unblockScreenOn(); 1139 updatePowerState(); 1140 } 1141 break; 1142 } 1143 } 1144 } 1145 1146 private final SensorEventListener mProximitySensorListener = new SensorEventListener() { 1147 @Override 1148 public void onSensorChanged(SensorEvent event) { 1149 if (mProximitySensorEnabled) { 1150 final long time = SystemClock.uptimeMillis(); 1151 final float distance = event.values[0]; 1152 boolean positive = distance >= 0.0f && distance < mProximityThreshold; 1153 handleProximitySensorEvent(time, positive); 1154 } 1155 } 1156 1157 @Override 1158 public void onAccuracyChanged(Sensor sensor, int accuracy) { 1159 // Not used. 1160 } 1161 }; 1162 1163 private final class ScreenOnUnblocker implements WindowManagerPolicy.ScreenOnListener { 1164 @Override 1165 public void onScreenOn() { 1166 Message msg = mHandler.obtainMessage(MSG_SCREEN_ON_UNBLOCKED, this); 1167 msg.setAsynchronous(true); 1168 mHandler.sendMessage(msg); 1169 } 1170 } 1171} 1172