1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
* 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.commands.hid;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Looper;
import android.os.Message;
import android.os.MessageQueue;
import android.os.SystemClock;
import android.util.Log;
import com.android.internal.os.SomeArgs;
public class Device {
private static final String TAG = "HidDevice";
// Minimum amount of time to wait before sending input events to a device. Even though we're
// guaranteed that the device has been created and opened by the input system, there's still a
// window in which the system hasn't started reading events out of it. If a stream of events
// begins in during this window (like a button down event) and *then* we start reading, we're
// liable to ignore the whole stream.
private static final int MIN_WAIT_FOR_FIRST_EVENT = 150;
private static final int MSG_OPEN_DEVICE = 1;
private static final int MSG_SEND_REPORT = 2;
private static final int MSG_CLOSE_DEVICE = 3;
private final int mId;
private final HandlerThread mThread;
private final DeviceHandler mHandler;
private long mEventTime;
private final Object mCond = new Object();
static {
System.loadLibrary("hidcommand_jni");
}
private static native long nativeOpenDevice(String name, int id, int vid, int pid,
byte[] descriptor, MessageQueue queue, DeviceCallback callback);
private static native void nativeSendReport(long ptr, byte[] data);
private static native void nativeCloseDevice(long ptr);
public Device(int id, String name, int vid, int pid, byte[] descriptor, byte[] report) {
mId = id;
mThread = new HandlerThread("HidDeviceHandler");
mThread.start();
mHandler = new DeviceHandler(mThread.getLooper());
SomeArgs args = SomeArgs.obtain();
args.argi1 = id;
args.argi2 = vid;
args.argi3 = pid;
if (name != null) {
args.arg1 = name;
} else {
args.arg1 = id + ":" + vid + ":" + pid;
}
args.arg2 = descriptor;
args.arg3 = report;
mHandler.obtainMessage(MSG_OPEN_DEVICE, args).sendToTarget();
mEventTime = SystemClock.uptimeMillis() + MIN_WAIT_FOR_FIRST_EVENT;
}
public void sendReport(byte[] report) {
Message msg = mHandler.obtainMessage(MSG_SEND_REPORT, report);
mHandler.sendMessageAtTime(msg, mEventTime);
}
public void addDelay(int delay) {
mEventTime += delay;
}
public void close() {
Message msg = mHandler.obtainMessage(MSG_CLOSE_DEVICE);
msg.setAsynchronous(true);
mHandler.sendMessageAtTime(msg, mEventTime + 1);
try {
synchronized (mCond) {
mCond.wait();
}
} catch (InterruptedException ignore) {}
}
private class DeviceHandler extends Handler {
private long mPtr;
private int mBarrierToken;
public DeviceHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_OPEN_DEVICE:
SomeArgs args = (SomeArgs) msg.obj;
mPtr = nativeOpenDevice((String) args.arg1, args.argi1, args.argi2, args.argi3,
(byte[]) args.arg2, getLooper().myQueue(), new DeviceCallback());
nativeSendReport(mPtr, (byte[]) args.arg3);
pauseEvents();
break;
case MSG_SEND_REPORT:
if (mPtr != 0) {
nativeSendReport(mPtr, (byte[]) msg.obj);
} else {
Log.e(TAG, "Tried to send report to closed device.");
}
break;
case MSG_CLOSE_DEVICE:
if (mPtr != 0) {
nativeCloseDevice(mPtr);
getLooper().quitSafely();
mPtr = 0;
} else {
Log.e(TAG, "Tried to close already closed device.");
}
synchronized (mCond) {
mCond.notify();
}
break;
default:
throw new IllegalArgumentException("Unknown device message");
}
}
public void pauseEvents() {
mBarrierToken = getLooper().myQueue().postSyncBarrier();
}
public void resumeEvents() {
getLooper().myQueue().removeSyncBarrier(mBarrierToken);
mBarrierToken = 0;
}
}
private class DeviceCallback {
public void onDeviceOpen() {
mHandler.resumeEvents();
}
public void onDeviceError() {
Message msg = mHandler.obtainMessage(MSG_CLOSE_DEVICE);
msg.setAsynchronous(true);
msg.sendToTarget();
}
}
}
|
