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
208
209
210
211
212
213
214
215
216
217
218
219
220
|
/*
* Copyright (C) 2011 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 an
* limitations under the License.
*/
package com.android.server.usb;
import android.content.Context;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.os.Parcelable;
import android.util.Slog;
import com.android.internal.annotations.GuardedBy;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.HashMap;
/**
* UsbHostManager manages USB state in host mode.
*/
public class UsbHostManager {
private static final String TAG = UsbHostManager.class.getSimpleName();
private static final boolean LOG = false;
// contains all connected USB devices
private final HashMap<String, UsbDevice> mDevices = new HashMap<String, UsbDevice>();
// USB busses to exclude from USB host support
private final String[] mHostBlacklist;
private final Context mContext;
private final Object mLock = new Object();
@GuardedBy("mLock")
private UsbSettingsManager mCurrentSettings;
public UsbHostManager(Context context) {
mContext = context;
mHostBlacklist = context.getResources().getStringArray(
com.android.internal.R.array.config_usbHostBlacklist);
}
public void setCurrentSettings(UsbSettingsManager settings) {
synchronized (mLock) {
mCurrentSettings = settings;
}
}
private UsbSettingsManager getCurrentSettings() {
synchronized (mLock) {
return mCurrentSettings;
}
}
private boolean isBlackListed(String deviceName) {
int count = mHostBlacklist.length;
for (int i = 0; i < count; i++) {
if (deviceName.startsWith(mHostBlacklist[i])) {
return true;
}
}
return false;
}
/* returns true if the USB device should not be accessible by applications */
private boolean isBlackListed(int clazz, int subClass, int protocol) {
// blacklist hubs
if (clazz == UsbConstants.USB_CLASS_HUB) return true;
// blacklist HID boot devices (mouse and keyboard)
if (clazz == UsbConstants.USB_CLASS_HID &&
subClass == UsbConstants.USB_INTERFACE_SUBCLASS_BOOT) {
return true;
}
return false;
}
/* Called from JNI in monitorUsbHostBus() to report new USB devices */
private void usbDeviceAdded(String deviceName, int vendorID, int productID,
int deviceClass, int deviceSubclass, int deviceProtocol,
/* array of quintuples containing id, class, subclass, protocol
and number of endpoints for each interface */
int[] interfaceValues,
/* array of quadruples containing address, attributes, max packet size
and interval for each endpoint */
int[] endpointValues) {
if (isBlackListed(deviceName) ||
isBlackListed(deviceClass, deviceSubclass, deviceProtocol)) {
return;
}
synchronized (mLock) {
if (mDevices.get(deviceName) != null) {
Slog.w(TAG, "device already on mDevices list: " + deviceName);
return;
}
int numInterfaces = interfaceValues.length / 5;
Parcelable[] interfaces = new UsbInterface[numInterfaces];
try {
// repackage interfaceValues as an array of UsbInterface
int intf, endp, ival = 0, eval = 0;
for (intf = 0; intf < numInterfaces; intf++) {
int interfaceId = interfaceValues[ival++];
int interfaceClass = interfaceValues[ival++];
int interfaceSubclass = interfaceValues[ival++];
int interfaceProtocol = interfaceValues[ival++];
int numEndpoints = interfaceValues[ival++];
Parcelable[] endpoints = new UsbEndpoint[numEndpoints];
for (endp = 0; endp < numEndpoints; endp++) {
int address = endpointValues[eval++];
int attributes = endpointValues[eval++];
int maxPacketSize = endpointValues[eval++];
int interval = endpointValues[eval++];
endpoints[endp] = new UsbEndpoint(address, attributes,
maxPacketSize, interval);
}
// don't allow if any interfaces are blacklisted
if (isBlackListed(interfaceClass, interfaceSubclass, interfaceProtocol)) {
return;
}
interfaces[intf] = new UsbInterface(interfaceId, interfaceClass,
interfaceSubclass, interfaceProtocol, endpoints);
}
} catch (Exception e) {
// beware of index out of bound exceptions, which might happen if
// a device does not set bNumEndpoints correctly
Slog.e(TAG, "error parsing USB descriptors", e);
return;
}
UsbDevice device = new UsbDevice(deviceName, vendorID, productID,
deviceClass, deviceSubclass, deviceProtocol, interfaces);
mDevices.put(deviceName, device);
getCurrentSettings().deviceAttached(device);
}
}
/* Called from JNI in monitorUsbHostBus to report USB device removal */
private void usbDeviceRemoved(String deviceName) {
synchronized (mLock) {
UsbDevice device = mDevices.remove(deviceName);
if (device != null) {
getCurrentSettings().deviceDetached(device);
}
}
}
public void systemReady() {
synchronized (mLock) {
// Create a thread to call into native code to wait for USB host events.
// This thread will call us back on usbDeviceAdded and usbDeviceRemoved.
Runnable runnable = new Runnable() {
public void run() {
monitorUsbHostBus();
}
};
new Thread(null, runnable, "UsbService host thread").start();
}
}
/* Returns a list of all currently attached USB devices */
public void getDeviceList(Bundle devices) {
synchronized (mLock) {
for (String name : mDevices.keySet()) {
devices.putParcelable(name, mDevices.get(name));
}
}
}
/* Opens the specified USB device */
public ParcelFileDescriptor openDevice(String deviceName) {
synchronized (mLock) {
if (isBlackListed(deviceName)) {
throw new SecurityException("USB device is on a restricted bus");
}
UsbDevice device = mDevices.get(deviceName);
if (device == null) {
// if it is not in mDevices, it either does not exist or is blacklisted
throw new IllegalArgumentException(
"device " + deviceName + " does not exist or is restricted");
}
getCurrentSettings().checkPermission(device);
return nativeOpenDevice(deviceName);
}
}
public void dump(FileDescriptor fd, PrintWriter pw) {
synchronized (mLock) {
pw.println(" USB Host State:");
for (String name : mDevices.keySet()) {
pw.println(" " + name + ": " + mDevices.get(name));
}
}
}
private native void monitorUsbHostBus();
private native ParcelFileDescriptor nativeOpenDevice(String deviceName);
}
|
