按电源键休眠流程(framework层)

这里以Android6.0为例

frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

PowerManager mPowerManager;
private void powerPress(long eventTime, boolean interactive, int count) {
        if (mScreenOnEarly && !mScreenOnFully) {
            Slog.i(TAG, "Suppressed redundant power key press while "
                    + "already in the process of turning the screen on.");
            return;
        }
        Slog.i(TAG,"eventTime="+eventTime+"  interactive="+interactive+" count="+count+" mShortPressOnPowerBehavior="+mShortPressOnPowerBehavior
        +" mBeganFromNonInteractive="+mBeganFromNonInteractive);
        if (count == 2) {
            powerMultiPressAction(eventTime, interactive, mDoublePressOnPowerBehavior);
        } else if (count == 3) {
            powerMultiPressAction(eventTime, interactive, mTriplePressOnPowerBehavior);
        } else if (interactive && !mBeganFromNonInteractive) {
            switch (mShortPressOnPowerBehavior) {
                case SHORT_PRESS_POWER_NOTHING:
                    break;
                case SHORT_PRESS_POWER_GO_TO_SLEEP:
                    mPowerManager.goToSleep(eventTime,
                            PowerManager.GO_TO_SLEEP_REASON_POWER_BUTTON, 0);
                    break;
                case SHORT_PRESS_POWER_REALLY_GO_TO_SLEEP:
                    mPowerManager.goToSleep(eventTime,
                            PowerManager.GO_TO_SLEEP_REASON_POWER_BUTTON,
                            PowerManager.GO_TO_SLEEP_FLAG_NO_DOZE);
                    break;
                case SHORT_PRESS_POWER_REALLY_GO_TO_SLEEP_AND_GO_HOME:
                    mPowerManager.goToSleep(eventTime,
                            PowerManager.GO_TO_SLEEP_REASON_POWER_BUTTON,
                            PowerManager.GO_TO_SLEEP_FLAG_NO_DOZE);
                    launchHomeFromHotKey();
                    break;
                case SHORT_PRESS_POWER_GO_HOME:
                    launchHomeFromHotKey(true /* awakenFromDreams */, false /*respectKeyguard*/);
                    break;
            }
        }
}
//按电源键跑的是SHORT_PRESS_POWER_GO_TO_SLEEP
frameworks/base/core/java/android/os/PowerManager.java
final IPowerManager mService;
public void goToSleep(long time, int reason, int flags) {
        try {
            mService.goToSleep(time, reason, flags);
        } catch (RemoteException e) {
        }
}
frameworks/base/core/java/android/os/IPowerManager.aidl

frameworks/base/services/core/java/com/android/server/power/PowerManagerService.java

public void goToSleep(long eventTime, int reason, int flags) {
            if (eventTime > SystemClock.uptimeMillis()) {
                throw new IllegalArgumentException("event time must not be in the future");
            }

            mContext.enforceCallingOrSelfPermission(
                    android.Manifest.permission.DEVICE_POWER, null);

            final int uid = Binder.getCallingUid();
            final long ident = Binder.clearCallingIdentity();
            try {
                goToSleepInternal(eventTime, reason, flags, uid);
            } finally {
                Binder.restoreCallingIdentity(ident);
            }
        }


private void goToSleepInternal(long eventTime, int reason, int flags, int uid) {
        synchronized (mLock) {
            if (goToSleepNoUpdateLocked(eventTime, reason, flags, uid)) {
                updatePowerStateLocked();
            }
        }
}


private boolean goToSleepNoUpdateLocked(long eventTime, int reason, int flags, int uid) {
        if (DEBUG_SPEW) {
            Slog.d(TAG, "goToSleepNoUpdateLocked: eventTime=" + eventTime
                    + ", reason=" + reason + ", flags=" + flags + ", uid=" + uid);
        }

        if (eventTime < mLastWakeTime
                || mWakefulness == WAKEFULNESS_ASLEEP
                || mWakefulness == WAKEFULNESS_DOZING
                || !mBootCompleted || !mSystemReady) {
            return false;
        }

        Trace.traceBegin(Trace.TRACE_TAG_POWER, "goToSleep");
        try {
            switch (reason) {
                case PowerManager.GO_TO_SLEEP_REASON_DEVICE_ADMIN:
                    Slog.i(TAG, "Going to sleep due to device administration policy "
                            + "(uid " + uid +")...");
                    break;
                case PowerManager.GO_TO_SLEEP_REASON_TIMEOUT:
                    Slog.i(TAG, "Going to sleep due to screen timeout (uid " + uid +")...");
                    break;
                case PowerManager.GO_TO_SLEEP_REASON_LID_SWITCH:
                    Slog.i(TAG, "Going to sleep due to lid switch (uid " + uid +")...");
                    break;
                case PowerManager.GO_TO_SLEEP_REASON_POWER_BUTTON:
                    Slog.i(TAG, "Going to sleep due to power button (uid " + uid +")...");
                    break;
                case PowerManager.GO_TO_SLEEP_REASON_SLEEP_BUTTON:
                    Slog.i(TAG, "Going to sleep due to sleep button (uid " + uid +")...");
                    break;
                case PowerManager.GO_TO_SLEEP_REASON_HDMI:
                    Slog.i(TAG, "Going to sleep due to HDMI standby (uid " + uid +")...");
                    break;
                default:
                    Slog.i(TAG, "Going to sleep by application request (uid " + uid +")...");
                    reason = PowerManager.GO_TO_SLEEP_REASON_APPLICATION;
                    break;
            }

            mLastSleepTime = eventTime;
            mSandmanSummoned = true;
            setWakefulnessLocked(WAKEFULNESS_DOZING, reason);

            // Report the number of wake locks that will be cleared by going to sleep.
            int numWakeLocksCleared = 0;
            final int numWakeLocks = mWakeLocks.size();
            for (int i = 0; i < numWakeLocks; i++) {
                final WakeLock wakeLock = mWakeLocks.get(i);
                switch (wakeLock.mFlags & PowerManager.WAKE_LOCK_LEVEL_MASK) {
                    case PowerManager.FULL_WAKE_LOCK:
                    case PowerManager.SCREEN_BRIGHT_WAKE_LOCK:
                    case PowerManager.SCREEN_DIM_WAKE_LOCK:
                        numWakeLocksCleared += 1;
                        break;
                }
            }
            EventLog.writeEvent(EventLogTags.POWER_SLEEP_REQUESTED, numWakeLocksCleared);

            // Skip dozing if requested.
            if ((flags & PowerManager.GO_TO_SLEEP_FLAG_NO_DOZE) != 0) {
                reallyGoToSleepNoUpdateLocked(eventTime, uid);
            }
        } finally {
            Trace.traceEnd(Trace.TRACE_TAG_POWER);
        }
        return true;
}


private void updatePowerStateLocked() {
        if (!mSystemReady || mDirty == 0) {
            return;
        }
        if (!Thread.holdsLock(mLock)) {
            Slog.wtf(TAG, "Power manager lock was not held when calling updatePowerStateLocked");
        }

        Trace.traceBegin(Trace.TRACE_TAG_POWER, "updatePowerState");
        try {
            // Phase 0: Basic state updates.
            updateIsPoweredLocked(mDirty);
            updateStayOnLocked(mDirty);
            updateScreenBrightnessBoostLocked(mDirty);

            // Phase 1: Update wakefulness.
            // Loop because the wake lock and user activity computations are influenced
            // by changes in wakefulness.
            final long now = SystemClock.uptimeMillis();
            int dirtyPhase2 = 0;
            for (;;) {
                int dirtyPhase1 = mDirty;
                dirtyPhase2 |= dirtyPhase1;
                mDirty = 0;

                updateWakeLockSummaryLocked(dirtyPhase1);
                updateUserActivitySummaryLocked(now, dirtyPhase1);
                if (!updateWakefulnessLocked(dirtyPhase1)) {
                    break;
                }
            }

            // Phase 2: Update display power state.
            boolean displayBecameReady = updateDisplayPowerStateLocked(dirtyPhase2);

            // Phase 3: Update dream state (depends on display ready signal).
            updateDreamLocked(dirtyPhase2, displayBecameReady);

            // Phase 4: Send notifications, if needed.
            finishWakefulnessChangeIfNeededLocked();

            // Phase 5: Update suspend blocker.
            // Because we might release the last suspend blocker here, we need to make sure
            // we finished everything else first!
            updateSuspendBlockerLocked();
        } finally {
            Trace.traceEnd(Trace.TRACE_TAG_POWER);
        }
}

	private void updateSuspendBlockerLocked() {
        final boolean needWakeLockSuspendBlocker = ((mWakeLockSummary & WAKE_LOCK_CPU) != 0);
        final boolean needDisplaySuspendBlocker = needDisplaySuspendBlockerLocked();
        final boolean autoSuspend = !needDisplaySuspendBlocker;
        final boolean interactive = mDisplayPowerRequest.isBrightOrDim();

        // Disable auto-suspend if needed.
        // FIXME We should consider just leaving auto-suspend enabled forever since
        // we already hold the necessary wakelocks.
        if (!autoSuspend && mDecoupleHalAutoSuspendModeFromDisplayConfig) {
            setHalAutoSuspendModeLocked(false);
        }

        // First acquire suspend blockers if needed.
        if (needWakeLockSuspendBlocker && !mHoldingWakeLockSuspendBlocker) {
            mWakeLockSuspendBlocker.acquire();
            mHoldingWakeLockSuspendBlocker = true;
        }
        if (needDisplaySuspendBlocker && !mHoldingDisplaySuspendBlocker) {
            mDisplaySuspendBlocker.acquire();
            mHoldingDisplaySuspendBlocker = true;
        }

        // Inform the power HAL about interactive mode.
        // Although we could set interactive strictly based on the wakefulness
        // as reported by isInteractive(), it is actually more desirable to track
        // the display policy state instead so that the interactive state observed
        // by the HAL more accurately tracks transitions between AWAKE and DOZING.
        // Refer to getDesiredScreenPolicyLocked() for details.
        if (mDecoupleHalInteractiveModeFromDisplayConfig) {
            // When becoming non-interactive, we want to defer sending this signal
            // until the display is actually ready so that all transitions have
            // completed.  This is probably a good sign that things have gotten
            // too tangled over here...
            if (interactive || mDisplayReady) {
                setHalInteractiveModeLocked(interactive);
            }
        }

        // Then release suspend blockers if needed.
        if (!needWakeLockSuspendBlocker && mHoldingWakeLockSuspendBlocker) {
            mWakeLockSuspendBlocker.release();
            mHoldingWakeLockSuspendBlocker = false;
        }
        if (!needDisplaySuspendBlocker && mHoldingDisplaySuspendBlocker) {
            mDisplaySuspendBlocker.release();
            mHoldingDisplaySuspendBlocker = false;
        }

        // Enable auto-suspend if needed.
        if (autoSuspend && mDecoupleHalAutoSuspendModeFromDisplayConfig) {
            setHalAutoSuspendModeLocked(true);
        }
    }
    private void setHalAutoSuspendModeLocked(boolean enable) {
        if (enable != mHalAutoSuspendModeEnabled) {
            if (DEBUG) {
                Slog.d(TAG, "Setting HAL auto-suspend mode to " + enable);
            }
            mHalAutoSuspendModeEnabled = enable;
            Trace.traceBegin(Trace.TRACE_TAG_POWER, "setHalAutoSuspend(" + enable + ")");
            try {
                nativeSetAutoSuspend(enable);
            } finally {
                Trace.traceEnd(Trace.TRACE_TAG_POWER);
            }
        }
    }

frameworks/base/services/core/jni/com_android_server_power_PowerManagerService.cpp

static void nativeSetAutoSuspend(JNIEnv* /* env */, jclass /* clazz */, jboolean enable) {
    if (enable) {
        ALOGD_IF_SLOW(100, "Excessive delay in autosuspend_enable() while turning screen off");
        autosuspend_enable();
    } else {
        ALOGD_IF_SLOW(100, "Excessive delay in autosuspend_disable() while turning screen on");
        autosuspend_disable();
    }
}
最终跑autosuspend_enable,内核的休眠流程可参考 https://blog.csdn.net/mike8825/article/details/80420213

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