1 files changed, 220 insertions, 0 deletions
diff --git a/services/core/java/com/android/server/usb/UsbHostManager.java b/services/core/java/com/android/server/usb/UsbHostManager.java
new file mode 100644
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--- /dev/null
+++ b/services/core/java/com/android/server/usb/UsbHostManager.java
@@ -0,0 +1,220 @@
+/*
+ * 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);
+}