1package 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
19import android.hardware.hdmi.HdmiControlManager;
20import android.hardware.hdmi.HdmiPlaybackClient;
21import android.hardware.hdmi.HdmiPlaybackClient.DisplayStatusCallback;
22import android.hardware.hdmi.IHdmiControlCallback;
23import android.os.RemoteException;
24import android.util.Slog;
25
26import java.util.ArrayList;
27import java.util.List;
28
29/**
30 * Feature action that queries the power status of other device. This action is initiated via
31 * {@link HdmiPlaybackClient#queryDisplayStatus(DisplayStatusCallback)} from the Android system
32 * working as playback device to get the power status of TV device.
33 * <p>
34 * Package-private, accessed by {@link HdmiControlService} only.
35 */
36final class DevicePowerStatusAction extends HdmiCecFeatureAction {
37    private static final String TAG = "DevicePowerStatusAction";
38
39    // State in which the action is waiting for <Report Power Status>.
40    private static final int STATE_WAITING_FOR_REPORT_POWER_STATUS = 1;
41
42    private final int mTargetAddress;
43    private final List<IHdmiControlCallback> mCallbacks = new ArrayList<>();
44
45    static DevicePowerStatusAction create(HdmiCecLocalDevice source,
46            int targetAddress, IHdmiControlCallback callback) {
47        if (source == null || callback == null) {
48            Slog.e(TAG, "Wrong arguments");
49            return null;
50        }
51        return new DevicePowerStatusAction(source, targetAddress, callback);
52    }
53
54    private DevicePowerStatusAction(HdmiCecLocalDevice localDevice,
55            int targetAddress, IHdmiControlCallback callback) {
56        super(localDevice);
57        mTargetAddress = targetAddress;
58        addCallback(callback);
59    }
60
61    @Override
62    boolean start() {
63        queryDevicePowerStatus();
64        mState = STATE_WAITING_FOR_REPORT_POWER_STATUS;
65        addTimer(mState, HdmiConfig.TIMEOUT_MS);
66        return true;
67    }
68
69    private void queryDevicePowerStatus() {
70        sendCommand(HdmiCecMessageBuilder.buildGiveDevicePowerStatus(getSourceAddress(),
71                mTargetAddress));
72    }
73
74    @Override
75    boolean processCommand(HdmiCecMessage cmd) {
76        if (mState != STATE_WAITING_FOR_REPORT_POWER_STATUS
77               || mTargetAddress != cmd.getSource()) {
78            return false;
79        }
80        if (cmd.getOpcode() == Constants.MESSAGE_REPORT_POWER_STATUS) {
81            int status = cmd.getParams()[0];
82            invokeCallback(status);
83            finish();
84            return true;
85        }
86        return false;
87    }
88
89    @Override
90    void handleTimerEvent(int state) {
91        if (mState != state) {
92            return;
93        }
94        if (state == STATE_WAITING_FOR_REPORT_POWER_STATUS) {
95            // Got no response from TV. Report status 'unknown'.
96            invokeCallback(HdmiControlManager.POWER_STATUS_UNKNOWN);
97            finish();
98        }
99    }
100
101    public void addCallback(IHdmiControlCallback callback) {
102        mCallbacks.add(callback);
103    }
104
105    private void invokeCallback(int result) {
106        try {
107            for (IHdmiControlCallback callback : mCallbacks) {
108                callback.onComplete(result);
109            }
110        } catch (RemoteException e) {
111            Slog.e(TAG, "Callback failed:" + e);
112        }
113    }
114}
115