UsbService.java revision 1848d31c2cbb5404be383ad44049e58e36b258ba 
1/*
2 * Copyright (C) 2010 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 an
14 * limitations under the License.
15 */
16
17package com.android.server.usb;
18
19import android.app.PendingIntent;
20import android.content.BroadcastReceiver;
21import android.content.Context;
22import android.content.Intent;
23import android.content.IntentFilter;
24import android.content.pm.PackageManager;
25import android.hardware.usb.IUsbManager;
26import android.hardware.usb.UsbAccessory;
27import android.hardware.usb.UsbDevice;
28import android.os.Bundle;
29import android.os.ParcelFileDescriptor;
30import android.os.UserHandle;
31import android.os.UserManager;
32import android.util.SparseArray;
33
34import com.android.internal.annotations.GuardedBy;
35import com.android.internal.util.IndentingPrintWriter;
36import com.android.server.SystemService;
37
38import java.io.File;
39import java.io.FileDescriptor;
40import java.io.PrintWriter;
41
42/**
43 * UsbService manages all USB related state, including both host and device support.
44 * Host related events and calls are delegated to UsbHostManager, and device related
45 * support is delegated to UsbDeviceManager.
46 */
47public class UsbService extends IUsbManager.Stub {
48
49    public static class Lifecycle extends SystemService {
50        private UsbService mUsbService;
51
52        public Lifecycle(Context context) {
53            super(context);
54        }
55
56        @Override
57        public void onStart() {
58            mUsbService = new UsbService(getContext());
59            publishBinderService(Context.USB_SERVICE, mUsbService);
60        }
61
62        @Override
63        public void onBootPhase(int phase) {
64            if (phase == SystemService.PHASE_ACTIVITY_MANAGER_READY) {
65                mUsbService.systemReady();
66            }
67        }
68    }
69
70    private static final String TAG = "UsbService";
71
72    private final Context mContext;
73
74    private UsbDeviceManager mDeviceManager;
75    private UsbHostManager mHostManager;
76
77    private final Object mLock = new Object();
78
79    /** Map from {@link UserHandle} to {@link UsbSettingsManager} */
80    @GuardedBy("mLock")
81    private final SparseArray<UsbSettingsManager>
82            mSettingsByUser = new SparseArray<UsbSettingsManager>();
83
84    private UsbSettingsManager getSettingsForUser(int userId) {
85        synchronized (mLock) {
86            UsbSettingsManager settings = mSettingsByUser.get(userId);
87            if (settings == null) {
88                settings = new UsbSettingsManager(mContext, new UserHandle(userId));
89                mSettingsByUser.put(userId, settings);
90            }
91            return settings;
92        }
93    }
94
95    public UsbService(Context context) {
96        mContext = context;
97
98        final PackageManager pm = mContext.getPackageManager();
99        if (pm.hasSystemFeature(PackageManager.FEATURE_USB_HOST)) {
100            mHostManager = new UsbHostManager(context);
101        }
102        if (new File("/sys/class/android_usb").exists()) {
103            mDeviceManager = new UsbDeviceManager(context);
104        }
105
106        setCurrentUser(UserHandle.USER_OWNER);
107
108        final IntentFilter userFilter = new IntentFilter();
109        userFilter.addAction(Intent.ACTION_USER_SWITCHED);
110        userFilter.addAction(Intent.ACTION_USER_STOPPED);
111        mContext.registerReceiver(mUserReceiver, userFilter, null, null);
112    }
113
114    private BroadcastReceiver mUserReceiver = new BroadcastReceiver() {
115        @Override
116        public void onReceive(Context context, Intent intent) {
117            final int userId = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, -1);
118            final String action = intent.getAction();
119            if (Intent.ACTION_USER_SWITCHED.equals(action)) {
120                setCurrentUser(userId);
121            } else if (Intent.ACTION_USER_STOPPED.equals(action)) {
122                synchronized (mLock) {
123                    mSettingsByUser.remove(userId);
124                }
125            }
126        }
127    };
128
129    private void setCurrentUser(int userId) {
130        final UsbSettingsManager userSettings = getSettingsForUser(userId);
131        if (mHostManager != null) {
132            mHostManager.setCurrentSettings(userSettings);
133        }
134        if (mDeviceManager != null) {
135            mDeviceManager.setCurrentSettings(userSettings);
136        }
137    }
138
139    public void systemReady() {
140        if (mDeviceManager != null) {
141            mDeviceManager.systemReady();
142        }
143        if (mHostManager != null) {
144            mHostManager.systemReady();
145        }
146    }
147
148    /* Returns a list of all currently attached USB devices (host mdoe) */
149    @Override
150    public void getDeviceList(Bundle devices) {
151        if (mHostManager != null) {
152            mHostManager.getDeviceList(devices);
153        }
154    }
155
156    /* Opens the specified USB device (host mode) */
157    @Override
158    public ParcelFileDescriptor openDevice(String deviceName) {
159        if (mHostManager != null) {
160            return mHostManager.openDevice(deviceName);
161        } else {
162            return null;
163        }
164    }
165
166    /* returns the currently attached USB accessory (device mode) */
167    @Override
168    public UsbAccessory getCurrentAccessory() {
169        if (mDeviceManager != null) {
170            return mDeviceManager.getCurrentAccessory();
171        } else {
172            return null;
173        }
174    }
175
176    /* opens the currently attached USB accessory (device mode) */
177    @Override
178    public ParcelFileDescriptor openAccessory(UsbAccessory accessory) {
179        if (mDeviceManager != null) {
180            return mDeviceManager.openAccessory(accessory);
181        } else {
182            return null;
183        }
184    }
185
186    @Override
187    public void setDevicePackage(UsbDevice device, String packageName, int userId) {
188        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
189        getSettingsForUser(userId).setDevicePackage(device, packageName);
190    }
191
192    @Override
193    public void setAccessoryPackage(UsbAccessory accessory, String packageName, int userId) {
194        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
195        getSettingsForUser(userId).setAccessoryPackage(accessory, packageName);
196    }
197
198    @Override
199    public boolean hasDevicePermission(UsbDevice device) {
200        final int userId = UserHandle.getCallingUserId();
201        return getSettingsForUser(userId).hasPermission(device);
202    }
203
204    @Override
205    public boolean hasAccessoryPermission(UsbAccessory accessory) {
206        final int userId = UserHandle.getCallingUserId();
207        return getSettingsForUser(userId).hasPermission(accessory);
208    }
209
210    @Override
211    public void requestDevicePermission(UsbDevice device, String packageName, PendingIntent pi) {
212        final int userId = UserHandle.getCallingUserId();
213        getSettingsForUser(userId).requestPermission(device, packageName, pi);
214    }
215
216    @Override
217    public void requestAccessoryPermission(
218            UsbAccessory accessory, String packageName, PendingIntent pi) {
219        final int userId = UserHandle.getCallingUserId();
220        getSettingsForUser(userId).requestPermission(accessory, packageName, pi);
221    }
222
223    @Override
224    public void grantDevicePermission(UsbDevice device, int uid) {
225        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
226        final int userId = UserHandle.getUserId(uid);
227        getSettingsForUser(userId).grantDevicePermission(device, uid);
228    }
229
230    @Override
231    public void grantAccessoryPermission(UsbAccessory accessory, int uid) {
232        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
233        final int userId = UserHandle.getUserId(uid);
234        getSettingsForUser(userId).grantAccessoryPermission(accessory, uid);
235    }
236
237    @Override
238    public boolean hasDefaults(String packageName, int userId) {
239        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
240        return getSettingsForUser(userId).hasDefaults(packageName);
241    }
242
243    @Override
244    public void clearDefaults(String packageName, int userId) {
245        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
246        getSettingsForUser(userId).clearDefaults(packageName);
247    }
248
249    @Override
250    public void setCurrentFunction(String function, boolean makeDefault) {
251        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
252
253        // If attempt to change USB function while file transfer is restricted, ensure that
254        // the current function is set to "none", and return.
255        UserManager userManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE);
256        if (userManager.hasUserRestriction(UserManager.DISALLOW_USB_FILE_TRANSFER)) {
257            if (mDeviceManager != null) mDeviceManager.setCurrentFunctions("none", false);
258            return;
259        }
260
261        if (mDeviceManager != null) {
262            mDeviceManager.setCurrentFunctions(function, makeDefault);
263        } else {
264            throw new IllegalStateException("USB device mode not supported");
265        }
266    }
267
268    @Override
269    public void setMassStorageBackingFile(String path) {
270        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
271        if (mDeviceManager != null) {
272            mDeviceManager.setMassStorageBackingFile(path);
273        } else {
274            throw new IllegalStateException("USB device mode not supported");
275        }
276    }
277
278    @Override
279    public void allowUsbDebugging(boolean alwaysAllow, String publicKey) {
280        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
281        mDeviceManager.allowUsbDebugging(alwaysAllow, publicKey);
282    }
283
284    @Override
285    public void denyUsbDebugging() {
286        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
287        mDeviceManager.denyUsbDebugging();
288    }
289
290    @Override
291    public void clearUsbDebuggingKeys() {
292        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
293        mDeviceManager.clearUsbDebuggingKeys();
294    }
295
296    @Override
297    public void dump(FileDescriptor fd, PrintWriter writer, String[] args) {
298        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.DUMP, TAG);
299        final IndentingPrintWriter pw = new IndentingPrintWriter(writer, "  ");
300
301        pw.println("USB Manager State:");
302        if (mDeviceManager != null) {
303            mDeviceManager.dump(fd, pw);
304        }
305        if (mHostManager != null) {
306            mHostManager.dump(fd, pw);
307        }
308
309        synchronized (mLock) {
310            for (int i = 0; i < mSettingsByUser.size(); i++) {
311                final int userId = mSettingsByUser.keyAt(i);
312                final UsbSettingsManager settings = mSettingsByUser.valueAt(i);
313                pw.increaseIndent();
314                pw.println("Settings for user " + userId + ":");
315                settings.dump(fd, pw);
316                pw.decreaseIndent();
317            }
318        }
319        pw.decreaseIndent();
320    }
321}
322