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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/*
* Copyright (C) 2010 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.server;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.hardware.Usb;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.os.UEventObserver;
import android.provider.Settings;
import android.util.Log;
import android.util.Slog;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.ArrayList;
/**
* <p>UsbObserver monitors for changes to USB state.
*/
class UsbObserver extends UEventObserver {
private static final String TAG = UsbObserver.class.getSimpleName();
private static final boolean LOG = false;
private static final String USB_CONFIGURATION_MATCH = "DEVPATH=/devices/virtual/switch/usb_configuration";
private static final String USB_FUNCTIONS_MATCH = "DEVPATH=/devices/virtual/usb_composite/";
private static final String USB_CONFIGURATION_PATH = "/sys/class/switch/usb_configuration/state";
private static final String USB_COMPOSITE_CLASS_PATH = "/sys/class/usb_composite";
private static final int MSG_UPDATE = 0;
private int mUsbConfig = 0;
private int mPreviousUsbConfig = 0;
// lists of enabled and disabled USB functions
private final ArrayList<String> mEnabledFunctions = new ArrayList<String>();
private final ArrayList<String> mDisabledFunctions = new ArrayList<String>();
private boolean mSystemReady;
private final Context mContext;
private PowerManagerService mPowerManager;
public UsbObserver(Context context) {
mContext = context;
init(); // set initial status
startObserving(USB_CONFIGURATION_MATCH);
startObserving(USB_FUNCTIONS_MATCH);
}
@Override
public void onUEvent(UEventObserver.UEvent event) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Slog.v(TAG, "USB UEVENT: " + event.toString());
}
synchronized (this) {
String switchState = event.get("SWITCH_STATE");
if (switchState != null) {
try {
int newConfig = Integer.parseInt(switchState);
if (newConfig != mUsbConfig) {
mPreviousUsbConfig = mUsbConfig;
mUsbConfig = newConfig;
// trigger an Intent broadcast
if (mSystemReady) {
update();
}
}
} catch (NumberFormatException e) {
Slog.e(TAG, "Could not parse switch state from event " + event);
}
} else {
String function = event.get("FUNCTION");
String enabledStr = event.get("ENABLED");
if (function != null && enabledStr != null) {
// Note: we do not broadcast a change when a function is enabled or disabled.
// We just record the state change for the next broadcast.
boolean enabled = "1".equals(enabledStr);
if (enabled) {
if (!mEnabledFunctions.contains(function)) {
mEnabledFunctions.add(function);
}
mDisabledFunctions.remove(function);
} else {
if (!mDisabledFunctions.contains(function)) {
mDisabledFunctions.add(function);
}
mEnabledFunctions.remove(function);
}
}
}
}
}
private final void init() {
char[] buffer = new char[1024];
try {
FileReader file = new FileReader(USB_CONFIGURATION_PATH);
int len = file.read(buffer, 0, 1024);
mPreviousUsbConfig = mUsbConfig = Integer.valueOf((new String(buffer, 0, len)).trim());
} catch (FileNotFoundException e) {
Slog.w(TAG, "This kernel does not have USB configuration switch support");
} catch (Exception e) {
Slog.e(TAG, "" , e);
}
try {
File[] files = new File(USB_COMPOSITE_CLASS_PATH).listFiles();
for (int i = 0; i < files.length; i++) {
File file = new File(files[i], "enable");
FileReader reader = new FileReader(file);
int len = reader.read(buffer, 0, 1024);
int value = Integer.valueOf((new String(buffer, 0, len)).trim());
String functionName = files[i].getName();
if (value == 1) {
mEnabledFunctions.add(functionName);
} else {
mDisabledFunctions.add(functionName);
}
}
} catch (FileNotFoundException e) {
Slog.w(TAG, "This kernel does not have USB composite class support");
} catch (Exception e) {
Slog.e(TAG, "" , e);
}
}
void systemReady() {
synchronized (this) {
update();
mSystemReady = true;
}
}
private final void update() {
mHandler.sendEmptyMessage(MSG_UPDATE);
}
private final Handler mHandler = new Handler() {
private void addEnabledFunctions(Intent intent) {
// include state of all USB functions in our extras
for (int i = 0; i < mEnabledFunctions.size(); i++) {
intent.putExtra(mEnabledFunctions.get(i), Usb.USB_FUNCTION_ENABLED);
}
for (int i = 0; i < mDisabledFunctions.size(); i++) {
intent.putExtra(mDisabledFunctions.get(i), Usb.USB_FUNCTION_DISABLED);
}
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_UPDATE:
synchronized (this) {
final ContentResolver cr = mContext.getContentResolver();
if (Settings.Secure.getInt(cr,
Settings.Secure.DEVICE_PROVISIONED, 0) == 0) {
Slog.i(TAG, "Device not provisioned, skipping USB broadcast");
return;
}
// Send an Intent containing connected/disconnected state
// and the enabled/disabled state of all USB functions
Intent intent;
boolean usbConnected = (mUsbConfig != 0);
if (usbConnected) {
intent = new Intent(Usb.ACTION_USB_CONNECTED);
addEnabledFunctions(intent);
} else {
intent = new Intent(Usb.ACTION_USB_DISCONNECTED);
}
mContext.sendBroadcast(intent);
// send a sticky broadcast for clients interested in both connect and disconnect
intent = new Intent(Usb.ACTION_USB_STATE);
intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
intent.putExtra(Usb.USB_CONNECTED, usbConnected);
addEnabledFunctions(intent);
mContext.sendStickyBroadcast(intent);
}
break;
}
}
};
}
|