diff options
Diffstat (limited to 'services/core/java/com/android/server/ThermalObserver.java')
-rw-r--r-- | services/core/java/com/android/server/ThermalObserver.java | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/ThermalObserver.java b/services/core/java/com/android/server/ThermalObserver.java new file mode 100644 index 0000000..aee28fb --- /dev/null +++ b/services/core/java/com/android/server/ThermalObserver.java @@ -0,0 +1,146 @@ +/* + * Copyright (C) 2015 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License + */ + +package com.android.server; + +import android.content.Context; +import android.content.Intent; +import android.content.pm.PackageManager; +import android.os.Binder; +import android.os.Handler; +import android.os.Message; +import android.os.PowerManager; +import android.os.UEventObserver; +import android.os.UserHandle; + +import java.io.FileDescriptor; +import java.io.PrintWriter; + +/** + * ThermalObserver for monitoring temperature changes. + */ +public class ThermalObserver extends SystemService { + private static final String TAG = "ThermalObserver"; + + private static final String CALLSTATE_UEVENT_MATCH = + "DEVPATH=/devices/virtual/switch/thermalstate"; + + private static final int MSG_THERMAL_STATE_CHANGED = 0; + + private static final int SWITCH_STATE_NORMAL = 0; + private static final int SWITCH_STATE_WARNING = 1; + private static final int SWITCH_STATE_EXCEEDED = 2; + + private final PowerManager mPowerManager; + private final PowerManager.WakeLock mWakeLock; + + private final Object mLock = new Object(); + private Integer mLastState; + + private final UEventObserver mThermalWarningObserver = new UEventObserver() { + @Override + public void onUEvent(UEventObserver.UEvent event) { + updateLocked(Integer.parseInt(event.get("SWITCH_STATE"))); + } + }; + + private final Handler mHandler = new Handler(true /*async*/) { + @Override + public void handleMessage(Message msg) { + switch (msg.what) { + case MSG_THERMAL_STATE_CHANGED: + handleThermalStateChange(msg.arg1); + mWakeLock.release(); + break; + } + } + }; + + public ThermalObserver(Context context) { + super(context); + mPowerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE); + mWakeLock = mPowerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, TAG); + + mThermalWarningObserver.startObserving(CALLSTATE_UEVENT_MATCH); + } + + private void updateLocked(int state) { + Message message = new Message(); + message.what = MSG_THERMAL_STATE_CHANGED; + message.arg1 = state; + + mWakeLock.acquire(); + mHandler.sendMessage(message); + } + + private void handleThermalStateChange(int state) { + synchronized (mLock) { + mLastState = state; + Intent intent = new Intent(Intent.ACTION_THERMAL_EVENT); + intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING); + + final int thermalState; + + switch (state) { + case SWITCH_STATE_WARNING: + thermalState = Intent.EXTRA_THERMAL_STATE_WARNING; + break; + case SWITCH_STATE_EXCEEDED: + thermalState = Intent.EXTRA_THERMAL_STATE_EXCEEDED; + break; + case SWITCH_STATE_NORMAL: + default: + thermalState = Intent.EXTRA_THERMAL_STATE_NORMAL; + break; + } + + intent.putExtra(Intent.EXTRA_THERMAL_STATE, thermalState); + + getContext().sendBroadcastAsUser(intent, UserHandle.ALL); + } + } + + @Override + public void onStart() { + publishBinderService(TAG, new BinderService()); + } + + private final class BinderService extends Binder { + @Override + protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { + if (getContext().checkCallingOrSelfPermission(android.Manifest.permission.DUMP) + != PackageManager.PERMISSION_GRANTED) { + pw.println("Permission Denial: can't dump thermal observer service from from pid=" + + Binder.getCallingPid() + + ", uid=" + Binder.getCallingUid()); + return; + } + + final long ident = Binder.clearCallingIdentity(); + try { + synchronized (mLock) { + if (args == null || args.length == 0 || "-a".equals(args[0])) { + pw.println("Current Thermal Observer Service state:"); + pw.println(" last state change: " + + (mLastState != null ? mLastState : "none")); + } + } + } finally { + Binder.restoreCallingIdentity(ident); + } + } + } +} |