| /* |
| * 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 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); |
| } |