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/*
* Copyright (C) 2016 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 org.chromium.latency.walt;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbManager;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
import java.util.HashMap;
import java.util.Locale;
public abstract class BaseUsbConnection {
private static final String USB_PERMISSION_RESPONSE_INTENT = "usb-permission-response";
private static final String CONNECT_INTENT = "org.chromium.latency.walt.CONNECT";
protected SimpleLogger logger;
protected Context context;
private LocalBroadcastManager broadcastManager;
private BroadcastReceiver currentConnectReceiver;
private WaltConnection.ConnectionStateListener connectionStateListener;
private UsbManager usbManager;
protected UsbDevice usbDevice = null;
protected UsbDeviceConnection usbConnection;
public BaseUsbConnection(Context context) {
this.context = context.getApplicationContext();
usbManager = (UsbManager) this.context.getSystemService(Context.USB_SERVICE);
logger = SimpleLogger.getInstance(context);
broadcastManager = LocalBroadcastManager.getInstance(context);
}
public abstract int getVid();
public abstract int getPid();
// Used to distinguish between bootloader and normal mode that differ by PID
// TODO: change intent strings to reduce dependence on PID
protected abstract boolean isCompatibleUsbDevice(UsbDevice usbDevice);
public void onDisconnect() {
if (connectionStateListener != null) {
connectionStateListener.onDisconnect();
}
}
public void onConnect() {
if (connectionStateListener != null) {
connectionStateListener.onConnect();
}
}
private String getConnectIntent() {
return CONNECT_INTENT + getVid() + ":" + getPid();
}
private String getUsbPermissionResponseIntent() {
return USB_PERMISSION_RESPONSE_INTENT + getVid() + ":" + getPid();
}
public boolean isConnected() {
return usbConnection != null;
}
public void registerConnectCallback(final Runnable r) {
if (currentConnectReceiver != null) {
broadcastManager.unregisterReceiver(currentConnectReceiver);
currentConnectReceiver = null;
}
if (isConnected()) {
r.run();
return;
}
currentConnectReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
broadcastManager.unregisterReceiver(this);
r.run();
}
};
broadcastManager.registerReceiver(currentConnectReceiver,
new IntentFilter(getConnectIntent()));
}
public void connect() {
UsbDevice usbDevice = findUsbDevice();
connect(usbDevice);
}
public void connect(UsbDevice usbDevice) {
if (usbDevice == null) {
logger.log("Device not found.");
return;
}
if (!isCompatibleUsbDevice(usbDevice)) {
logger.log("Not a valid device");
return;
}
this.usbDevice = usbDevice;
// Request permission
// This displays a dialog asking user for permission to use the device.
// No dialog is displayed if the permission was already given before or the app started as a
// result of intent filter when the device was plugged in.
PendingIntent permissionIntent = PendingIntent.getBroadcast(context, 0,
new Intent(getUsbPermissionResponseIntent()), 0);
context.registerReceiver(respondToUsbPermission,
new IntentFilter(getUsbPermissionResponseIntent()));
logger.log("Requesting permission for USB device.");
usbManager.requestPermission(this.usbDevice, permissionIntent);
}
public void disconnect() {
onDisconnect();
usbConnection.close();
usbConnection = null;
usbDevice = null;
context.unregisterReceiver(disconnectReceiver);
}
private BroadcastReceiver disconnectReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
UsbDevice usbDevice = intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
if (isConnected() && BaseUsbConnection.this.usbDevice.equals(usbDevice)) {
logger.log("WALT was detached");
disconnect();
}
}
};
private BroadcastReceiver respondToUsbPermission = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (usbDevice == null) {
logger.log("USB device was not properly opened");
return;
}
if(intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false) &&
usbDevice.equals(intent.getParcelableExtra(UsbManager.EXTRA_DEVICE))){
usbConnection = usbManager.openDevice(usbDevice);
BaseUsbConnection.this.context.registerReceiver(disconnectReceiver,
new IntentFilter(UsbManager.ACTION_USB_DEVICE_DETACHED));
onConnect();
broadcastManager.sendBroadcast(new Intent(getConnectIntent()));
} else {
logger.log("Could not get permission to open the USB device");
}
BaseUsbConnection.this.context.unregisterReceiver(respondToUsbPermission);
}
};
public UsbDevice findUsbDevice() {
logger.log(String.format(Locale.US,
"Looking for TeensyUSB VID=0x%x PID=0x%x", getVid(), getPid()));
HashMap<String, UsbDevice> deviceHash = usbManager.getDeviceList();
if (deviceHash.size() == 0) {
logger.log("No connected USB devices found");
return null;
}
logger.log("Found " + deviceHash.size() + " connected USB devices:");
UsbDevice usbDevice = null;
for (String key : deviceHash.keySet()) {
UsbDevice dev = deviceHash.get(key);
String msg = String.format(Locale.US,
"USB Device: %s, VID:PID - %x:%x, %d interfaces",
key, dev.getVendorId(), dev.getProductId(), dev.getInterfaceCount()
);
if (isCompatibleUsbDevice(dev)) {
usbDevice = dev;
msg = "Using " + msg;
} else {
msg = "Skipping " + msg;
}
logger.log(msg);
}
return usbDevice;
}
public void setConnectionStateListener(WaltConnection.ConnectionStateListener connectionStateListener) {
this.connectionStateListener = connectionStateListener;
}
}
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