DevicePowerStatusAction.java revision 5fba96df30b6b50b3cb9fe1d783320b1cc3bd6ea 
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.IHdmiControlCallback;
21import android.os.RemoteException;
22import android.util.Slog;
23
24/**
25 * Feature action that queries the power status of other device.
26 *
27 * This action is initiated via {@link HdmiControlManager#queryDisplayStatus()} from
28 * the Android system working as playback device to get the power status of TV device.
29 *
30 * <p>Package-private, accessed by {@link HdmiControlService} only.
31 */
32
33final class DevicePowerStatusAction extends FeatureAction {
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            return false;
75        }
76        if (cmd.getOpcode() == Constants.MESSAGE_REPORT_POWER_STATUS) {
77            int status = cmd.getParams()[0];
78            invokeCallback(status);
79            finish();
80            return true;
81        }
82        return false;
83    }
84
85    @Override
86    void handleTimerEvent(int state) {
87        if (mState != state) {
88            return;
89        }
90        if (state == STATE_WAITING_FOR_REPORT_POWER_STATUS) {
91            // Got no response from TV. Report status 'unknown'.
92            invokeCallback(HdmiControlManager.POWER_STATUS_UNKNOWN);
93            finish();
94        }
95    }
96
97    private void invokeCallback(int result) {
98        try {
99            mCallback.onComplete(result);
100        } catch (RemoteException e) {
101            Slog.e(TAG, "Callback failed:" + e);
102        }
103    }
104}
105