578 lines
24 KiB
Java
578 lines
24 KiB
Java
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.server.usb;
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import android.app.PendingIntent;
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import android.content.BroadcastReceiver;
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import android.content.ContentResolver;
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import android.content.Context;
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import android.content.Intent;
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import android.content.IntentFilter;
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import android.content.pm.PackageManager;
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import android.hardware.usb.IUsbManager;
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import android.hardware.usb.UsbAccessory;
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import android.hardware.usb.UsbManager;
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import android.net.Uri;
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import android.os.Binder;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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import android.os.Parcelable;
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import android.os.ParcelFileDescriptor;
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import android.os.UEventObserver;
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import android.provider.Settings;
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import android.util.Log;
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import android.util.Slog;
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import java.io.File;
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import java.io.FileDescriptor;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.io.PrintWriter;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.io.FileInputStream;
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import java.lang.Byte;
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import java.io.IOException;
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/**
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* UsbService monitors for changes to USB state.
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* This includes code for both USB host support (where the android device is the host)
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* as well as USB device support (android device is connected to a USB host).
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* Accessory mode is a special case of USB device mode, where the android device is
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* connected to a USB host that supports the android accessory protocol.
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*/
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public class UsbService extends IUsbManager.Stub {
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private static final String TAG = UsbService.class.getSimpleName();
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private static final boolean LOG = false;
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private static final String USB_CONNECTED_MATCH =
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"DEVPATH=/devices/virtual/switch/usb_connected";
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private static final String USB_CONFIGURATION_MATCH =
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"DEVPATH=/devices/virtual/switch/usb_configuration";
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private static final String USB_FUNCTIONS_MATCH =
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"DEVPATH=/devices/virtual/usb_composite/";
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private static final String USB_CONNECTED_PATH =
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"/sys/class/switch/usb_connected/state";
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private static final String USB_CONFIGURATION_PATH =
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"/sys/class/switch/usb_configuration/state";
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private static final String USB_COMPOSITE_CLASS_PATH =
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"/sys/class/usb_composite";
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private static final String USB_RNDIS_ENABLE =
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"/sys/class/usb_composite/rndis/enable";
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private static final String USB_UEVENT_MATCH =
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"DEVPATH=/devices/virtual/android_usb/android0";
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private static final String NEW_USB_CONNECTED_PATH =
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"/sys/class/android_usb/android0/state";
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private static final String USB_ENABLED_FUNCTIONS_PATH =
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"/sys/class/android_usb/android0/functions";
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private static final int MSG_UPDATE_STATE = 0;
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private static final int MSG_FUNCTION_ENABLED = 1;
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private static final int MSG_FUNCTION_DISABLED = 2;
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// Delay for debouncing USB disconnects.
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// We often get rapid connect/disconnect events when enabling USB functions,
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// which need debouncing.
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private static final int UPDATE_DELAY = 5000;
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// current connected and configuration state
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private int mConnected;
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private int mConfiguration;
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// last broadcasted connected and configuration state
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private int mLastConnected = -1;
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private int mLastConfiguration = -1;
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// Function enable is in progress
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private boolean mSoftSwitch;
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// lists of enabled and disabled USB functions (for USB device mode)
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private final ArrayList<String> mEnabledFunctions = new ArrayList<String>();
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private final ArrayList<String> mDisabledFunctions = new ArrayList<String>();
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private boolean mSystemReady;
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private UsbAccessory mCurrentAccessory;
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// USB functions that are enabled by default, to restore after exiting accessory mode
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private final ArrayList<String> mDefaultFunctions = new ArrayList<String>();
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private final Context mContext;
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private final Object mLock = new Object();
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private final UsbDeviceSettingsManager mDeviceManager;
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private final boolean mHasUsbAccessory;
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private final void readCurrentAccessoryLocked() {
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if (mHasUsbAccessory) {
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String[] strings = nativeGetAccessoryStrings();
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if (strings != null) {
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mCurrentAccessory = new UsbAccessory(strings);
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Log.d(TAG, "entering USB accessory mode: " + mCurrentAccessory);
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if (mSystemReady) {
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mDeviceManager.accessoryAttached(mCurrentAccessory);
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}
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} else {
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Log.e(TAG, "nativeGetAccessoryStrings failed");
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}
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}
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}
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/*
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* Handles USB function enable/disable events (device mode)
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*/
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private final void functionEnabledLocked(String function, boolean enabled) {
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if (enabled) {
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if (!mEnabledFunctions.contains(function)) {
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mEnabledFunctions.add(function);
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}
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mDisabledFunctions.remove(function);
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if (UsbManager.USB_FUNCTION_RNDIS.equals(function)) {
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mSoftSwitch = true;
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} else if (UsbManager.USB_FUNCTION_ACCESSORY.equals(function)) {
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mSoftSwitch = true;
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readCurrentAccessoryLocked();
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}
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} else {
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if (!mDisabledFunctions.contains(function)) {
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mDisabledFunctions.add(function);
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}
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mEnabledFunctions.remove(function);
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}
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}
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/*
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* Listens for uevent messages from the kernel to monitor the USB state (device mode)
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*/
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private final UEventObserver mUEventObserver = new UEventObserver() {
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@Override
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public void onUEvent(UEventObserver.UEvent event) {
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if (Log.isLoggable(TAG, Log.VERBOSE)) {
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Slog.v(TAG, "USB UEVENT: " + event.toString());
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}
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synchronized (mLock) {
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String usb_state = event.get("USB_STATE");
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if(usb_state != null) {
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if ("DISCONNECTED".equals(usb_state)) {
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mConnected = 0;
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mConfiguration = 0;
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if (mSystemReady) {
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// debounce disconnects to avoid problems bringing up USB tethering
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update((mConnected == 0) && functionStatus("rndis"));
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}
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} else if ("CONFIGURED".equals(usb_state)) {
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Slog.i(TAG, "state: " + usb_state);
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mConnected = 1;
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mConfiguration = 1;
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if (mSystemReady) {
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update(mConnected == 0);
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}
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}
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}
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String name = event.get("SWITCH_NAME");
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String state = event.get("SWITCH_STATE");
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if (name != null && state != null) {
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try {
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int intState = Integer.parseInt(state);
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if ("usb_connected".equals(name)) {
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mConnected = intState;
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// trigger an Intent broadcast
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if (mSystemReady) {
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// debounce disconnects to avoid problems bringing up USB tethering
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update((mConnected == 0) && mSoftSwitch);
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}
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} else if ("usb_configuration".equals(name)) {
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mConfiguration = intState;
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// trigger an Intent broadcast
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if (mSystemReady) {
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update((mConnected == 0) && mSoftSwitch);
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if ((mConnected == 1) && mSoftSwitch)
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mSoftSwitch = false;
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}
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}
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} catch (NumberFormatException e) {
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Slog.e(TAG, "Could not parse switch state from event " + event);
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}
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} else {
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String function = event.get("FUNCTION");
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String enabledStr = event.get("ENABLED");
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if (function != null && enabledStr != null) {
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// Note: we do not broadcast a change when a function is enabled or disabled.
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// We just record the state change for the next broadcast.
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int what = ("1".equals(enabledStr) ?
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MSG_FUNCTION_ENABLED : MSG_FUNCTION_DISABLED);
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Message msg = Message.obtain(mHandler, what);
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msg.obj = function;
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mHandler.sendMessage(msg);
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}
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}
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}
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}
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};
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private final BroadcastReceiver mBootCompletedReceiver = new BroadcastReceiver() {
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public void onReceive(Context context, Intent intent) {
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// handle accessories attached at boot time
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synchronized (mLock) {
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if (mCurrentAccessory != null) {
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mDeviceManager.accessoryAttached(mCurrentAccessory);
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}
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}
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}
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};
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public UsbService(Context context) {
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mContext = context;
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mDeviceManager = new UsbDeviceSettingsManager(context);
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PackageManager pm = mContext.getPackageManager();
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mHasUsbAccessory = pm.hasSystemFeature(PackageManager.FEATURE_USB_ACCESSORY);
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synchronized (mLock) {
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init(); // set initial status
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// Watch for USB configuration changes
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if (mConfiguration >= 0) {
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mUEventObserver.startObserving(USB_CONNECTED_MATCH);
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mUEventObserver.startObserving(USB_CONFIGURATION_MATCH);
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mUEventObserver.startObserving(USB_FUNCTIONS_MATCH);
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mUEventObserver.startObserving(USB_UEVENT_MATCH);
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}
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}
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}
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private final void init() {
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char[] buffer = new char[1024];
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boolean inAccessoryMode = false;
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// Read initial USB state (device mode)
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mConfiguration = -1;
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try {
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FileReader file = new FileReader(USB_CONNECTED_PATH);
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int len = file.read(buffer, 0, 1024);
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file.close();
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mConnected = Integer.valueOf((new String(buffer, 0, len)).trim());
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file = new FileReader(USB_CONFIGURATION_PATH);
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len = file.read(buffer, 0, 1024);
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file.close();
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mConfiguration = Integer.valueOf((new String(buffer, 0, len)).trim());
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} catch (FileNotFoundException e) {
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Slog.i(TAG, "This kernel does not have USB configuration switch support");
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} catch (Exception e) {
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Slog.e(TAG, "" , e);
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}
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if (mConfiguration < 0) {
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//This may happen if ABI has changed
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try {
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FileReader file = new FileReader(NEW_USB_CONNECTED_PATH);
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int len = file.read(buffer, 0, 1024);
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file.close();
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String usb_state = new String(buffer, 0, len).trim();
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Log.d(TAG, "state: " + usb_state);
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if ("DISCONNECTED".equals(usb_state)) {
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mConnected = 0;
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mConfiguration = 0;
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} else if ("CONFIGURED".equals(usb_state)) {
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mConnected = 1;
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mConfiguration = 1;
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} else {
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mConnected = 1;
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mConfiguration = 0;
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}
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} catch (FileNotFoundException e) {
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Slog.i(TAG, "This kernel does not have USB configuration switch support");
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} catch (Exception e) {
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Slog.e(TAG, "" , e);
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}
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}
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if (mConfiguration < 0) {
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// This may happen in the emulator or devices without USB device mode support
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return;
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}
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// Read initial list of enabled and disabled functions (device mode)
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try {
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File[] files = new File(USB_COMPOSITE_CLASS_PATH).listFiles();
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for (int i = 0; i < files.length; i++) {
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File file = new File(files[i], "enable");
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FileReader reader = new FileReader(file);
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int len = reader.read(buffer, 0, 1024);
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reader.close();
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int value = Integer.valueOf((new String(buffer, 0, len)).trim());
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String functionName = files[i].getName();
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if (value == 1) {
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mEnabledFunctions.add(functionName);
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if (UsbManager.USB_FUNCTION_ACCESSORY.equals(functionName)) {
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// The USB accessory driver is on by default, but it might have been
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// enabled before the USB service has initialized.
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inAccessoryMode = true;
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} else if (!UsbManager.USB_FUNCTION_ADB.equals(functionName)) {
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// adb is enabled/disabled automatically by the adbd daemon,
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// so don't treat it as a default function.
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mDefaultFunctions.add(functionName);
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}
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} else {
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mDisabledFunctions.add(functionName);
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}
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}
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} catch (FileNotFoundException e) {
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Slog.w(TAG, "This kernel does not have USB composite class support");
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} catch (Exception e) {
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Slog.e(TAG, "" , e);
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}
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// handle the case where an accessory switched the driver to accessory mode
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// before the framework finished booting
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if (inAccessoryMode) {
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readCurrentAccessoryLocked();
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// FIXME - if we booted in accessory mode, then we have no way to figure out
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// which functions are enabled by default.
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// For now, assume that MTP or mass storage are the only possibilities
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if (mDisabledFunctions.contains(UsbManager.USB_FUNCTION_MTP)) {
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mDefaultFunctions.add(UsbManager.USB_FUNCTION_MTP);
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} else if (mDisabledFunctions.contains(UsbManager.USB_FUNCTION_MASS_STORAGE)) {
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mDefaultFunctions.add(UsbManager.USB_FUNCTION_MASS_STORAGE);
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}
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}
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}
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public void systemReady() {
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synchronized (mLock) {
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update(false);
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if (mCurrentAccessory != null) {
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Log.d(TAG, "accessoryAttached at systemReady");
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// its still too early to handle accessories, so add a BOOT_COMPLETED receiver
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// to handle this later.
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mContext.registerReceiver(mBootCompletedReceiver,
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|
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new IntentFilter(Intent.ACTION_BOOT_COMPLETED));
|
||
|
|
}
|
||
|
|
mSystemReady = true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Sends a message to update the USB connected and configured state (device mode).
|
||
|
|
* If delayed is true, then we add a small delay in sending the message to debounce
|
||
|
|
* the USB connection when enabling USB tethering.
|
||
|
|
*/
|
||
|
|
private final void update(boolean delayed) {
|
||
|
|
mHandler.removeMessages(MSG_UPDATE_STATE);
|
||
|
|
mHandler.sendEmptyMessageDelayed(MSG_UPDATE_STATE, delayed ? UPDATE_DELAY : 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* returns the currently attached USB accessory (device mode) */
|
||
|
|
public UsbAccessory getCurrentAccessory() {
|
||
|
|
return mCurrentAccessory;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* opens the currently attached USB accessory (device mode) */
|
||
|
|
public ParcelFileDescriptor openAccessory(UsbAccessory accessory) {
|
||
|
|
synchronized (mLock) {
|
||
|
|
if (mCurrentAccessory == null) {
|
||
|
|
throw new IllegalArgumentException("no accessory attached");
|
||
|
|
}
|
||
|
|
if (!mCurrentAccessory.equals(accessory)) {
|
||
|
|
Log.e(TAG, accessory.toString() + " does not match current accessory "
|
||
|
|
+ mCurrentAccessory);
|
||
|
|
throw new IllegalArgumentException("accessory not attached");
|
||
|
|
}
|
||
|
|
mDeviceManager.checkPermission(mCurrentAccessory);
|
||
|
|
return nativeOpenAccessory();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public void setAccessoryPackage(UsbAccessory accessory, String packageName) {
|
||
|
|
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
|
||
|
|
mDeviceManager.setAccessoryPackage(accessory, packageName);
|
||
|
|
}
|
||
|
|
|
||
|
|
public boolean hasAccessoryPermission(UsbAccessory accessory) {
|
||
|
|
return mDeviceManager.hasPermission(accessory);
|
||
|
|
}
|
||
|
|
|
||
|
|
public void requestAccessoryPermission(UsbAccessory accessory, String packageName,
|
||
|
|
PendingIntent pi) {
|
||
|
|
mDeviceManager.requestPermission(accessory, packageName, pi);
|
||
|
|
}
|
||
|
|
|
||
|
|
public void grantAccessoryPermission(UsbAccessory accessory, int uid) {
|
||
|
|
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
|
||
|
|
mDeviceManager.grantAccessoryPermission(accessory, uid);
|
||
|
|
}
|
||
|
|
|
||
|
|
public boolean hasDefaults(String packageName) {
|
||
|
|
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
|
||
|
|
return mDeviceManager.hasDefaults(packageName);
|
||
|
|
}
|
||
|
|
|
||
|
|
public void clearDefaults(String packageName) {
|
||
|
|
mContext.enforceCallingOrSelfPermission(android.Manifest.permission.MANAGE_USB, null);
|
||
|
|
mDeviceManager.clearDefaults(packageName);
|
||
|
|
}
|
||
|
|
|
||
|
|
public boolean functionStatus(String match) {
|
||
|
|
char[] buffer = new char[1024];
|
||
|
|
char status;
|
||
|
|
try {
|
||
|
|
FileReader file = new FileReader(USB_ENABLED_FUNCTIONS_PATH);
|
||
|
|
int len = file.read(buffer, 0, 1024);
|
||
|
|
file.close();
|
||
|
|
String enabled_functions = new String(buffer, 0, len).trim();
|
||
|
|
|
||
|
|
Log.d(TAG, "Enabled functions: " + enabled_functions);
|
||
|
|
if (enabled_functions.indexOf(match) > -1)
|
||
|
|
return true;
|
||
|
|
else
|
||
|
|
return false;
|
||
|
|
|
||
|
|
} catch (FileNotFoundException e) {
|
||
|
|
Log.e(TAG, "Exception File not found"+e);
|
||
|
|
} catch (Exception e) {
|
||
|
|
Slog.e(TAG, "" , e);
|
||
|
|
}
|
||
|
|
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* This handler is for deferred handling of events related to device mode and accessories.
|
||
|
|
*/
|
||
|
|
private final Handler mHandler = new Handler() {
|
||
|
|
private void addEnabledFunctionsLocked(Intent intent) {
|
||
|
|
// include state of all USB functions in our extras
|
||
|
|
for (int i = 0; i < mEnabledFunctions.size(); i++) {
|
||
|
|
intent.putExtra(mEnabledFunctions.get(i), UsbManager.USB_FUNCTION_ENABLED);
|
||
|
|
}
|
||
|
|
for (int i = 0; i < mDisabledFunctions.size(); i++) {
|
||
|
|
intent.putExtra(mDisabledFunctions.get(i), UsbManager.USB_FUNCTION_DISABLED);
|
||
|
|
}
|
||
|
|
//With new USB ABI changes, check again for adb, ms and rndis
|
||
|
|
if (functionStatus("adb"))
|
||
|
|
intent.putExtra("adb", UsbManager.USB_FUNCTION_ENABLED);
|
||
|
|
if (functionStatus("rndis"))
|
||
|
|
intent.putExtra("rndis", UsbManager.USB_FUNCTION_ENABLED);
|
||
|
|
if (functionStatus("mass_storage"))
|
||
|
|
intent.putExtra("mass_storage", UsbManager.USB_FUNCTION_ENABLED);
|
||
|
|
}
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void handleMessage(Message msg) {
|
||
|
|
synchronized (mLock) {
|
||
|
|
switch (msg.what) {
|
||
|
|
case MSG_UPDATE_STATE:
|
||
|
|
if (mConnected != mLastConnected || mConfiguration != mLastConfiguration) {
|
||
|
|
if (mConnected == 0) {
|
||
|
|
if (UsbManager.isFunctionEnabled(
|
||
|
|
UsbManager.USB_FUNCTION_ACCESSORY)) {
|
||
|
|
// make sure accessory mode is off, and restore default functions
|
||
|
|
Log.d(TAG, "exited USB accessory mode");
|
||
|
|
if (!UsbManager.setFunctionEnabled
|
||
|
|
(UsbManager.USB_FUNCTION_ACCESSORY, false)) {
|
||
|
|
Log.e(TAG, "could not disable accessory function");
|
||
|
|
}
|
||
|
|
int count = mDefaultFunctions.size();
|
||
|
|
for (int i = 0; i < count; i++) {
|
||
|
|
String function = mDefaultFunctions.get(i);
|
||
|
|
if (!UsbManager.setFunctionEnabled(function, true)) {
|
||
|
|
Log.e(TAG, "could not reenable function " + function);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (mCurrentAccessory != null) {
|
||
|
|
mDeviceManager.accessoryDetached(mCurrentAccessory);
|
||
|
|
mCurrentAccessory = null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
|
||
|
|
mLastConnected = mConnected;
|
||
|
|
mLastConfiguration = mConfiguration;
|
||
|
|
|
||
|
|
// send a sticky broadcast containing current USB state
|
||
|
|
Intent intent = new Intent(UsbManager.ACTION_USB_STATE);
|
||
|
|
intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
|
||
|
|
intent.putExtra(UsbManager.USB_CONNECTED, mConnected != 0);
|
||
|
|
intent.putExtra(UsbManager.USB_CONFIGURATION, mConfiguration);
|
||
|
|
addEnabledFunctionsLocked(intent);
|
||
|
|
mContext.sendStickyBroadcast(intent);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case MSG_FUNCTION_ENABLED:
|
||
|
|
case MSG_FUNCTION_DISABLED:
|
||
|
|
functionEnabledLocked((String)msg.obj, msg.what == MSG_FUNCTION_ENABLED);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
@Override
|
||
|
|
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
|
||
|
|
if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP)
|
||
|
|
!= PackageManager.PERMISSION_GRANTED) {
|
||
|
|
pw.println("Permission Denial: can't dump UsbManager from from pid="
|
||
|
|
+ Binder.getCallingPid()
|
||
|
|
+ ", uid=" + Binder.getCallingUid());
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
synchronized (mLock) {
|
||
|
|
pw.println("USB Manager State:");
|
||
|
|
|
||
|
|
pw.println(" USB Device State:");
|
||
|
|
pw.print(" Enabled Functions: ");
|
||
|
|
for (int i = 0; i < mEnabledFunctions.size(); i++) {
|
||
|
|
pw.print(mEnabledFunctions.get(i) + " ");
|
||
|
|
}
|
||
|
|
pw.println("");
|
||
|
|
pw.print(" Disabled Functions: ");
|
||
|
|
for (int i = 0; i < mDisabledFunctions.size(); i++) {
|
||
|
|
pw.print(mDisabledFunctions.get(i) + " ");
|
||
|
|
}
|
||
|
|
pw.println("");
|
||
|
|
pw.print(" Default Functions: ");
|
||
|
|
for (int i = 0; i < mDefaultFunctions.size(); i++) {
|
||
|
|
pw.print(mDefaultFunctions.get(i) + " ");
|
||
|
|
}
|
||
|
|
pw.println("");
|
||
|
|
pw.println(" mConnected: " + mConnected + ", mConfiguration: " + mConfiguration);
|
||
|
|
pw.println(" mCurrentAccessory: " + mCurrentAccessory);
|
||
|
|
|
||
|
|
mDeviceManager.dump(fd, pw);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// accessory support
|
||
|
|
private native String[] nativeGetAccessoryStrings();
|
||
|
|
private native ParcelFileDescriptor nativeOpenAccessory();
|
||
|
|
}
|