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/*
* Copyright (C) 2010 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 and
* limitations under the License.
*/
package com.android.server;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.hardware.Usb;
import android.net.Uri;
import android.os.Handler;
import android.os.Message;
import android.os.UEventObserver;
import android.provider.Settings;
import android.util.Log;
import android.util.Slog;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.ArrayList;
/**
* <p>UsbObserver monitors for changes to USB state.
*/
class UsbObserver extends UEventObserver {
private static final String TAG = UsbObserver.class.getSimpleName();
private static final boolean LOG = false;
private static final String USB_CONFIGURATION_MATCH = "DEVPATH=/devices/virtual/switch/usb_configuration";
private static final String USB_FUNCTIONS_MATCH = "DEVPATH=/devices/virtual/usb_composite/";
private static final String USB_CONFIGURATION_PATH = "/sys/class/switch/usb_configuration/state";
private static final String USB_COMPOSITE_CLASS_PATH = "/sys/class/usb_composite";
private static final int MSG_UPDATE = 0;
private int mUsbConfig = 0;
private int mPreviousUsbConfig = 0;
// lists of enabled and disabled USB functions
private final ArrayList<String> mEnabledFunctions = new ArrayList<String>();
private final ArrayList<String> mDisabledFunctions = new ArrayList<String>();
private boolean mSystemReady;
private final Context mContext;
private PowerManagerService mPowerManager;
public UsbObserver(Context context) {
mContext = context;
init(); // set initial status
startObserving(USB_CONFIGURATION_MATCH);
startObserving(USB_FUNCTIONS_MATCH);
}
@Override
public void onUEvent(UEventObserver.UEvent event) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Slog.v(TAG, "USB UEVENT: " + event.toString());
}
synchronized (this) {
String switchState = event.get("SWITCH_STATE");
if (switchState != null) {
try {
int newConfig = Integer.parseInt(switchState);
if (newConfig != mUsbConfig) {
mPreviousUsbConfig = mUsbConfig;
mUsbConfig = newConfig;
// trigger an Intent broadcast
if (mSystemReady) {
update();
}
}
} catch (NumberFormatException e) {
Slog.e(TAG, "Could not parse switch state from event " + event);
}
} else {
String function = event.get("FUNCTION");
String enabledStr = event.get("ENABLED");
if (function != null && enabledStr != null) {
// Note: we do not broadcast a change when a function is enabled or disabled.
// We just record the state change for the next broadcast.
boolean enabled = "1".equals(enabledStr);
if (enabled) {
if (!mEnabledFunctions.contains(function)) {
mEnabledFunctions.add(function);
}
mDisabledFunctions.remove(function);
} else {
if (!mDisabledFunctions.contains(function)) {
mDisabledFunctions.add(function);
}
mEnabledFunctions.remove(function);
}
}
}
}
}
private final void init() {
char[] buffer = new char[1024];
try {
FileReader file = new FileReader(USB_CONFIGURATION_PATH);
int len = file.read(buffer, 0, 1024);
mPreviousUsbConfig = mUsbConfig = Integer.valueOf((new String(buffer, 0, len)).trim());
} catch (FileNotFoundException e) {
Slog.w(TAG, "This kernel does not have USB configuration switch support");
} catch (Exception e) {
Slog.e(TAG, "" , e);
}
try {
File[] files = new File(USB_COMPOSITE_CLASS_PATH).listFiles();
for (int i = 0; i < files.length; i++) {
File file = new File(files[i], "enable");
FileReader reader = new FileReader(file);
int len = reader.read(buffer, 0, 1024);
int value = Integer.valueOf((new String(buffer, 0, len)).trim());
String functionName = files[i].getName();
if (value == 1) {
mEnabledFunctions.add(functionName);
} else {
mDisabledFunctions.add(functionName);
}
}
} catch (FileNotFoundException e) {
Slog.w(TAG, "This kernel does not have USB composite class support");
} catch (Exception e) {
Slog.e(TAG, "" , e);
}
}
void systemReady() {
synchronized (this) {
update();
mSystemReady = true;
}
}
private final void update() {
mHandler.sendEmptyMessage(MSG_UPDATE);
}
private final Handler mHandler = new Handler() {
private void addEnabledFunctions(Intent intent) {
// include state of all USB functions in our extras
for (int i = 0; i < mEnabledFunctions.size(); i++) {
intent.putExtra(mEnabledFunctions.get(i), Usb.USB_FUNCTION_ENABLED);
}
for (int i = 0; i < mDisabledFunctions.size(); i++) {
intent.putExtra(mDisabledFunctions.get(i), Usb.USB_FUNCTION_DISABLED);
}
}
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_UPDATE:
synchronized (this) {
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;
}
// Send an Intent containing connected/disconnected state
// and the enabled/disabled state of all USB functions
Intent intent;
boolean usbConnected = (mUsbConfig != 0);
if (usbConnected) {
intent = new Intent(Usb.ACTION_USB_CONNECTED);
addEnabledFunctions(intent);
} else {
intent = new Intent(Usb.ACTION_USB_DISCONNECTED);
}
mContext.sendBroadcast(intent);
// send a sticky broadcast for clients interested in both connect and disconnect
intent = new Intent(Usb.ACTION_USB_STATE);
intent.addFlags(Intent.FLAG_RECEIVER_REPLACE_PENDING);
intent.putExtra(Usb.USB_CONNECTED, usbConnected);
addEnabledFunctions(intent);
mContext.sendStickyBroadcast(intent);
}
break;
}
}
};
}
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