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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 android.hardware;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.HashMap;
/**
* This class allows you to access the state of USB, both in host and device mode.
*
* <p>You can obtain an instance of this class by calling
* {@link android.content.Context#getSystemService(java.lang.String) Context.getSystemService()}.
*
* {@samplecode
* UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
* }
*/
public class UsbManager {
private static final String TAG = "UsbManager";
/**
* Broadcast Action: A sticky broadcast for USB state change events when in device mode.
*
* This is a sticky broadcast for clients that includes USB connected/disconnected state,
* the USB configuration that is currently set and a bundle containing name/value pairs
* with the names of the functions and a value of either {@link #USB_FUNCTION_ENABLED}
* or {@link #USB_FUNCTION_DISABLED}.
* Possible USB function names include {@link #USB_FUNCTION_MASS_STORAGE},
* {@link #USB_FUNCTION_ADB}, {@link #USB_FUNCTION_RNDIS} and {@link #USB_FUNCTION_MTP}.
*/
public static final String ACTION_USB_STATE =
"android.hardware.action.USB_STATE";
/**
* Broadcast Action: A broadcast for USB device attached event.
*
* This intent is sent when a USB device is attached to the USB bus when in host mode.
*/
public static final String ACTION_USB_DEVICE_ATTACHED =
"android.hardware.action.USB_DEVICE_ATTACHED";
/**
* Broadcast Action: A broadcast for USB device detached event.
*
* This intent is sent when a USB device is detached from the USB bus when in host mode.
*/
public static final String ACTION_USB_DEVICE_DETACHED =
"android.hardware.action.USB_DEVICE_DETACHED";
/**
* Boolean extra indicating whether USB is connected or disconnected.
* Used in extras for the {@link #ACTION_USB_STATE} broadcast.
*/
public static final String USB_CONNECTED = "connected";
/**
* Integer extra containing currently set USB configuration.
* Used in extras for the {@link #ACTION_USB_STATE} broadcast.
*/
public static final String USB_CONFIGURATION = "configuration";
/**
* Name of the USB mass storage USB function.
* Used in extras for the {@link #ACTION_USB_STATE} broadcast
*/
public static final String USB_FUNCTION_MASS_STORAGE = "mass_storage";
/**
* Name of the adb USB function.
* Used in extras for the {@link #ACTION_USB_STATE} broadcast
*/
public static final String USB_FUNCTION_ADB = "adb";
/**
* Name of the RNDIS ethernet USB function.
* Used in extras for the {@link #ACTION_USB_STATE} broadcast
*/
public static final String USB_FUNCTION_RNDIS = "rndis";
/**
* Name of the MTP USB function.
* Used in extras for the {@link #ACTION_USB_STATE} broadcast
*/
public static final String USB_FUNCTION_MTP = "mtp";
/**
* Value indicating that a USB function is enabled.
* Used in extras for the {@link #ACTION_USB_STATE} broadcast
*/
public static final String USB_FUNCTION_ENABLED = "enabled";
/**
* Value indicating that a USB function is disabled.
* Used in extras for the {@link #ACTION_USB_STATE} broadcast
*/
public static final String USB_FUNCTION_DISABLED = "disabled";
/**
* Name of extra for {@link #ACTION_USB_DEVICE_ATTACHED} and
* {@link #ACTION_USB_DEVICE_DETACHED} broadcasts
* containing the device's ID (String).
*/
public static final String EXTRA_DEVICE_NAME = "device_name";
/**
* Name of extra for {@link #ACTION_USB_DEVICE_ATTACHED} broadcast
* containing the device's vendor ID (int).
*/
public static final String EXTRA_VENDOR_ID = "vendor_id";
/**
* Name of extra for {@link #ACTION_USB_DEVICE_ATTACHED} broadcast
* containing the device's product ID (int).
*/
public static final String EXTRA_PRODUCT_ID = "product_id";
/**
* Name of extra for {@link #ACTION_USB_DEVICE_ATTACHED} broadcast
* containing the device's class (int).
*/
public static final String EXTRA_DEVICE_CLASS = "device_class";
/**
* Name of extra for {@link #ACTION_USB_DEVICE_ATTACHED} broadcast
* containing the device's class (int).
*/
public static final String EXTRA_DEVICE_SUBCLASS = "device_subclass";
/**
* Name of extra for {@link #ACTION_USB_DEVICE_ATTACHED} broadcast
* containing the device's class (int).
*/
public static final String EXTRA_DEVICE_PROTOCOL = "device_protocol";
/**
* Name of extra for {@link #ACTION_USB_DEVICE_ATTACHED} broadcast
* containing the UsbDevice object for the device.
*/
public static final String EXTRA_DEVICE = "device";
private IUsbManager mService;
/**
* {@hide}
*/
public UsbManager(IUsbManager service) {
mService = service;
}
/**
* Returns a HashMap containing all USB devices currently attached.
* USB device name is the key for the returned HashMap.
* The result will be empty if no devices are attached, or if
* USB host mode is inactive or unsupported.
*
* @return HashMap containing all connected USB devices.
*/
public HashMap<String,UsbDevice> getDeviceList() {
Bundle bundle = new Bundle();
try {
mService.getDeviceList(bundle);
HashMap<String,UsbDevice> result = new HashMap<String,UsbDevice>();
for (String name : bundle.keySet()) {
result.put(name, (UsbDevice)bundle.get(name));
}
return result;
} catch (RemoteException e) {
Log.e(TAG, "RemoteException in getDeviceList", e);
return null;
}
}
/**
* Opens the device so it can be used to send and receive
* data using {@link android.hardware.UsbRequest}.
*
* @param device the device to open
* @return true if we successfully opened the device
*/
public boolean openDevice(UsbDevice device) {
try {
ParcelFileDescriptor pfd = mService.openDevice(device.getDeviceName());
if (pfd == null) {
return false;
}
boolean result = device.open(pfd);
pfd.close();
return result;
} catch (Exception e) {
Log.e(TAG, "exception in UsbManager.openDevice", e);
return false;
}
}
private static File getFunctionEnableFile(String function) {
return new File("/sys/class/usb_composite/" + function + "/enable");
}
/**
* Returns true if the specified USB function is supported by the kernel.
* Note that a USB function maybe supported but disabled.
*
* @param function name of the USB function
* @return true if the USB function is supported.
*/
public static boolean isFunctionSupported(String function) {
return getFunctionEnableFile(function).exists();
}
/**
* Returns true if the specified USB function is currently enabled.
*
* @param function name of the USB function
* @return true if the USB function is enabled.
*/
public static boolean isFunctionEnabled(String function) {
try {
FileInputStream stream = new FileInputStream(getFunctionEnableFile(function));
boolean enabled = (stream.read() == '1');
stream.close();
return enabled;
} catch (IOException e) {
return false;
}
}
}
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