NewDeviceAction.java revision 5fba96df30b6b50b3cb9fe1d783320b1cc3bd6ea 
1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16package com.android.server.hdmi;
17
18import android.hardware.hdmi.HdmiCecDeviceInfo;
19import android.util.Slog;
20
21import java.io.UnsupportedEncodingException;
22
23/**
24 * Feature action that discovers the information of a newly found logical device.
25 *
26 * This action is created when receiving <Report Physical Address>, a CEC command a newly
27 * connected HDMI-CEC device broadcasts to announce its advent. Additional commands are issued in
28 * this action to gather more information on the device such as OSD name and device vendor ID.
29 *
30 * <p>The result is made in the form of {@link HdmiCecDeviceInfo} object, and passed to service
31 * for the management through its life cycle.
32 *
33 * <p>Package-private, accessed by {@link HdmiControlService} only.
34 */
35final class NewDeviceAction extends FeatureAction {
36
37    private static final String TAG = "NewDeviceAction";
38
39    // State in which the action sent <Give OSD Name> and is waiting for <Set OSD Name>
40    // that contains the name of the device for display on screen.
41    static final int STATE_WAITING_FOR_SET_OSD_NAME = 1;
42
43    // State in which the action sent <Give Device Vendor ID> and is waiting for
44    // <Device Vendor ID> that contains the vendor ID of the device.
45    static final int STATE_WAITING_FOR_DEVICE_VENDOR_ID = 2;
46
47    private final int mDeviceLogicalAddress;
48    private final int mDevicePhysicalAddress;
49
50    private int mVendorId;
51    private String mDisplayName;
52
53    /**
54     * Constructor.
55     *
56     * @param source {@link HdmiCecLocalDevice} instance
57     * @param deviceLogicalAddress logical address of the device in interest
58     * @param devicePhysicalAddress physical address of the device in interest
59     * @param requireRoutingChange whether to initiate routing change or not
60     */
61    NewDeviceAction(HdmiCecLocalDevice source, int deviceLogicalAddress,
62            int devicePhysicalAddress) {
63        super(source);
64        mDeviceLogicalAddress = deviceLogicalAddress;
65        mDevicePhysicalAddress = devicePhysicalAddress;
66        mVendorId = Constants.UNKNOWN_VENDOR_ID;
67    }
68
69    @Override
70    public boolean start() {
71        if (HdmiUtils.getTypeFromAddress(getSourceAddress())
72                == HdmiCecDeviceInfo.DEVICE_AUDIO_SYSTEM) {
73            if (tv().getAvrDeviceInfo() == null) {
74                // TODO: Start system audio initiation action
75            }
76
77            if (shouldTryArcInitiation()) {
78                addAndStartAction(new RequestArcInitiationAction(localDevice(),
79                                mDeviceLogicalAddress));
80            }
81        }
82
83        mState = STATE_WAITING_FOR_SET_OSD_NAME;
84        if (mayProcessCommandIfCached(mDeviceLogicalAddress, Constants.MESSAGE_SET_OSD_NAME)) {
85            return true;
86        }
87
88        sendCommand(HdmiCecMessageBuilder.buildGiveOsdNameCommand(getSourceAddress(),
89                mDeviceLogicalAddress));
90        addTimer(mState, HdmiConfig.TIMEOUT_MS);
91        return true;
92    }
93
94    private boolean shouldTryArcInitiation() {
95         return tv().isConnectedToArcPort(mDevicePhysicalAddress) && tv().isArcFeatureEnabled();
96    }
97
98    @Override
99    public boolean processCommand(HdmiCecMessage cmd) {
100        // For the logical device in interest, we want two more pieces of information -
101        // osd name and vendor id. They are requested in sequence. In case we don't
102        // get the expected responses (either by timeout or by receiving <feature abort> command),
103        // set them to a default osd name and unknown vendor id respectively.
104        int opcode = cmd.getOpcode();
105        int src = cmd.getSource();
106        byte[] params = cmd.getParams();
107
108        if (mDeviceLogicalAddress != src) {
109            return false;
110        }
111
112        if (mState == STATE_WAITING_FOR_SET_OSD_NAME) {
113            if (opcode == Constants.MESSAGE_SET_OSD_NAME) {
114                try {
115                    mDisplayName = new String(params, "US-ASCII");
116                } catch (UnsupportedEncodingException e) {
117                    Slog.e(TAG, "Failed to get OSD name: " + e.getMessage());
118                }
119                requestVendorId();
120                return true;
121            } else if (opcode == Constants.MESSAGE_FEATURE_ABORT) {
122                int requestOpcode = params[1] & 0xFF;
123                if (requestOpcode == Constants.MESSAGE_SET_OSD_NAME) {
124                    requestVendorId();
125                    return true;
126                }
127            }
128        } else if (mState == STATE_WAITING_FOR_DEVICE_VENDOR_ID) {
129            if (opcode == Constants.MESSAGE_DEVICE_VENDOR_ID) {
130                mVendorId = HdmiUtils.threeBytesToInt(params);
131                addDeviceInfo();
132                finish();
133                return true;
134            } else if (opcode == Constants.MESSAGE_FEATURE_ABORT) {
135                int requestOpcode = params[1] & 0xFF;
136                if (requestOpcode == Constants.MESSAGE_DEVICE_VENDOR_ID) {
137                    addDeviceInfo();
138                    finish();
139                    return true;
140                }
141            }
142        }
143        return false;
144    }
145
146    private boolean mayProcessCommandIfCached(int destAddress, int opcode) {
147        HdmiCecMessage message = getCecMessageCache().getMessage(destAddress, opcode);
148        if (message != null) {
149            return processCommand(message);
150        }
151        return false;
152    }
153
154    private void requestVendorId() {
155        // At first, transit to waiting status for <Device Vendor Id>.
156        mState = STATE_WAITING_FOR_DEVICE_VENDOR_ID;
157        // If the message is already in cache, process it.
158        if (mayProcessCommandIfCached(mDeviceLogicalAddress,
159                Constants.MESSAGE_DEVICE_VENDOR_ID)) {
160            return;
161        }
162        sendCommand(HdmiCecMessageBuilder.buildGiveDeviceVendorIdCommand(getSourceAddress(),
163                mDeviceLogicalAddress));
164        addTimer(mState, HdmiConfig.TIMEOUT_MS);
165    }
166
167    private void addDeviceInfo() {
168        if (mDisplayName == null) {
169            mDisplayName = HdmiUtils.getDefaultDeviceName(mDeviceLogicalAddress);
170        }
171        tv().addCecDevice(new HdmiCecDeviceInfo(
172                mDeviceLogicalAddress, mDevicePhysicalAddress,
173                HdmiUtils.getTypeFromAddress(mDeviceLogicalAddress),
174                mVendorId, mDisplayName));
175    }
176
177    @Override
178    public void handleTimerEvent(int state) {
179        if (mState == STATE_NONE || mState != state) {
180            return;
181        }
182        if (state == STATE_WAITING_FOR_SET_OSD_NAME) {
183            // Osd name request timed out. Try vendor id
184            requestVendorId();
185        } else if (state == STATE_WAITING_FOR_DEVICE_VENDOR_ID) {
186            // vendor id timed out. Go ahead creating the device info what we've got so far.
187            addDeviceInfo();
188            finish();
189        }
190    }
191}
192