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      1 package com.android.server.hdmi;
      2 
      3 /*
      4  * Copyright (C) 2014 The Android Open Source Project
      5  *
      6  * Licensed under the Apache License, Version 2.0 (the "License");
      7  * you may not use this file except in compliance with the License.
      8  * You may obtain a copy of the License at
      9  *
     10  *      http://www.apache.org/licenses/LICENSE-2.0
     11  *
     12  * Unless required by applicable law or agreed to in writing, software
     13  * distributed under the License is distributed on an "AS IS" BASIS,
     14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     15  * See the License for the specific language governing permissions and
     16  * limitations under the License.
     17  */
     18 
     19 import android.hardware.hdmi.HdmiControlManager;
     20 import android.hardware.hdmi.HdmiPlaybackClient;
     21 import android.hardware.hdmi.HdmiPlaybackClient.DisplayStatusCallback;
     22 import android.hardware.hdmi.IHdmiControlCallback;
     23 import android.os.RemoteException;
     24 import android.util.Slog;
     25 
     26 /**
     27  * Feature action that queries the power status of other device. This action is initiated via
     28  * {@link HdmiPlaybackClient#queryDisplayStatus(DisplayStatusCallback)} from the Android system
     29  * working as playback device to get the power status of TV device.
     30  * <p>
     31  * Package-private, accessed by {@link HdmiControlService} only.
     32  */
     33 final class DevicePowerStatusAction extends HdmiCecFeatureAction {
     34     private static final String TAG = "DevicePowerStatusAction";
     35 
     36     // State in which the action is waiting for <Report Power Status>.
     37     private static final int STATE_WAITING_FOR_REPORT_POWER_STATUS = 1;
     38 
     39     private final int mTargetAddress;
     40     private final IHdmiControlCallback mCallback;
     41 
     42     static DevicePowerStatusAction create(HdmiCecLocalDevice source,
     43             int targetAddress, IHdmiControlCallback callback) {
     44         if (source == null || callback == null) {
     45             Slog.e(TAG, "Wrong arguments");
     46             return null;
     47         }
     48         return new DevicePowerStatusAction(source, targetAddress, callback);
     49     }
     50 
     51     private DevicePowerStatusAction(HdmiCecLocalDevice localDevice,
     52             int targetAddress, IHdmiControlCallback callback) {
     53         super(localDevice);
     54         mTargetAddress = targetAddress;
     55         mCallback = callback;
     56     }
     57 
     58     @Override
     59     boolean start() {
     60         queryDevicePowerStatus();
     61         mState = STATE_WAITING_FOR_REPORT_POWER_STATUS;
     62         addTimer(mState, HdmiConfig.TIMEOUT_MS);
     63         return true;
     64     }
     65 
     66     private void queryDevicePowerStatus() {
     67         sendCommand(HdmiCecMessageBuilder.buildGiveDevicePowerStatus(getSourceAddress(),
     68                 mTargetAddress));
     69     }
     70 
     71     @Override
     72     boolean processCommand(HdmiCecMessage cmd) {
     73         if (mState != STATE_WAITING_FOR_REPORT_POWER_STATUS
     74                || mTargetAddress != cmd.getSource()) {
     75             return false;
     76         }
     77         if (cmd.getOpcode() == Constants.MESSAGE_REPORT_POWER_STATUS) {
     78             int status = cmd.getParams()[0];
     79             invokeCallback(status);
     80             finish();
     81             return true;
     82         }
     83         return false;
     84     }
     85 
     86     @Override
     87     void handleTimerEvent(int state) {
     88         if (mState != state) {
     89             return;
     90         }
     91         if (state == STATE_WAITING_FOR_REPORT_POWER_STATUS) {
     92             // Got no response from TV. Report status 'unknown'.
     93             invokeCallback(HdmiControlManager.POWER_STATUS_UNKNOWN);
     94             finish();
     95         }
     96     }
     97 
     98     private void invokeCallback(int result) {
     99         try {
    100             mCallback.onComplete(result);
    101         } catch (RemoteException e) {
    102             Slog.e(TAG, "Callback failed:" + e);
    103         }
    104     }
    105 }
    106