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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 java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
/**
* Class for accessing USB state information.
* @hide
*/
public class Usb {
/**
* Broadcast Action: A broadcast for USB connected events.
*
* The extras bundle will name/value pairs with the name of the function
* 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_CONNECTED =
"android.hardware.action.USB_CONNECTED";
/**
* Broadcast Action: A broadcast for USB disconnected events.
*/
public static final String ACTION_USB_DISCONNECTED =
"android.hardware.action.USB_DISCONNECTED";
/**
* Broadcast Action: A sticky broadcast for USB state change events.
*
* This is a sticky broadcast for clients that are interested in both USB connect and
* disconnect events. If you are only concerned with one or the other, you can use
* {@link #ACTION_USB_CONNECTED} or {@link #ACTION_USB_DISCONNECTED} to avoid receiving
* unnecessary broadcasts. The boolean {@link #USB_CONNECTED} extra indicates whether
* USB is connected or disconnected.
* The extras bundle will also contain name/value pairs with the name of the function
* 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 camera attached event.
*
* This intent is sent when a USB device supporting PTP is attached to the host USB bus.
* The intent's data contains a Uri for the device in the MTP provider.
*/
public static final String ACTION_USB_CAMERA_ATTACHED =
"android.hardware.action.USB_CAMERA_ATTACHED";
/**
* Broadcast Action: A broadcast for USB camera detached event.
*
* This intent is sent when a USB device supporting PTP is detached from the host USB bus.
* The intent's data contains a Uri for the device in the MTP provider.
*/
public static final String ACTION_USB_CAMERA_DETACHED =
"android.hardware.action.USB_CAMERA_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";
/**
* Name of the USB mass storage USB function.
* Used in extras for the {@link #ACTION_USB_CONNECTED} 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_CONNECTED} broadcast
*/
public static final String USB_FUNCTION_ADB = "adb";
/**
* Name of the RNDIS ethernet USB function.
* Used in extras for the {@link #ACTION_USB_CONNECTED} broadcast
*/
public static final String USB_FUNCTION_RNDIS = "rndis";
/**
* Name of the MTP USB function.
* Used in extras for the {@link #ACTION_USB_CONNECTED} 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_CONNECTED} 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_CONNECTED} broadcast
*/
public static final String USB_FUNCTION_DISABLED = "disabled";
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.
*/
public static boolean isFunctionSupported(String function) {
return getFunctionEnableFile(function).exists();
}
/**
* Returns true if the specified USB function is currently 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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