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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.usb;
import android.os.Parcel;
import android.os.Parcelable;
/**
* A class representing an endpoint on a {@link UsbInterface}.
* Endpoints are the channels for sending and receiving data over USB.
* Typically bulk endpoints are used for sending non-trivial amounts of data.
* Interrupt endpoints are used for sending small amounts of data, typically events,
* separately from the main data streams.
* The endpoint zero is a special endpoint for control messages sent from the host
* to device.
* Isochronous endpoints are currently unsupported.
*/
public class UsbEndpoint implements Parcelable {
private final int mAddress;
private final int mAttributes;
private final int mMaxPacketSize;
private final int mInterval;
/**
* UsbEndpoint should only be instantiated by UsbService implementation
* @hide
*/
public UsbEndpoint(int address, int attributes, int maxPacketSize, int interval) {
mAddress = address;
mAttributes = attributes;
mMaxPacketSize = maxPacketSize;
mInterval = interval;
}
/**
* Returns the endpoint's address field.
* The address is a bitfield containing both the endpoint number
* as well as the data direction of the endpoint.
* the endpoint number and direction can also be accessed via
* {@link #getEndpointNumber} and {@link #getDirection}.
*
* @return the endpoint's address
*/
public int getAddress() {
return mAddress;
}
/**
* Extracts the endpoint's endpoint number from its address
*
* @return the endpoint's endpoint number
*/
public int getEndpointNumber() {
return mAddress & UsbConstants.USB_ENDPOINT_NUMBER_MASK;
}
/**
* Returns the endpoint's direction.
* Returns {@link UsbConstants#USB_DIR_OUT}
* if the direction is host to device, and
* {@link UsbConstants#USB_DIR_IN} if the
* direction is device to host.
* @see UsbConstants#USB_DIR_IN
* @see UsbConstants#USB_DIR_OUT
*
* @return the endpoint's direction
*/
public int getDirection() {
return mAddress & UsbConstants.USB_ENDPOINT_DIR_MASK;
}
/**
* Returns the endpoint's attributes field.
*
* @return the endpoint's attributes
*/
public int getAttributes() {
return mAttributes;
}
/**
* Returns the endpoint's type.
* Possible results are:
* <ul>
* <li>{@link UsbConstants#USB_ENDPOINT_XFER_CONTROL} (endpoint zero)
* <li>{@link UsbConstants#USB_ENDPOINT_XFER_ISOC} (isochronous endpoint)
* <li>{@link UsbConstants#USB_ENDPOINT_XFER_BULK} (bulk endpoint)
* <li>{@link UsbConstants#USB_ENDPOINT_XFER_INT} (interrupt endpoint)
* </ul>
*
* @return the endpoint's type
*/
public int getType() {
return mAttributes & UsbConstants.USB_ENDPOINT_XFERTYPE_MASK;
}
/**
* Returns the endpoint's maximum packet size.
*
* @return the endpoint's maximum packet size
*/
public int getMaxPacketSize() {
return mMaxPacketSize;
}
/**
* Returns the endpoint's interval field.
*
* @return the endpoint's interval
*/
public int getInterval() {
return mInterval;
}
@Override
public String toString() {
return "UsbEndpoint[mAddress=" + mAddress + ",mAttributes=" + mAttributes +
",mMaxPacketSize=" + mMaxPacketSize + ",mInterval=" + mInterval +"]";
}
public static final @android.annotation.NonNull Parcelable.Creator<UsbEndpoint> CREATOR =
new Parcelable.Creator<UsbEndpoint>() {
public UsbEndpoint createFromParcel(Parcel in) {
int address = in.readInt();
int attributes = in.readInt();
int maxPacketSize = in.readInt();
int interval = in.readInt();
return new UsbEndpoint(address, attributes, maxPacketSize, interval);
}
public UsbEndpoint[] newArray(int size) {
return new UsbEndpoint[size];
}
};
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel parcel, int flags) {
parcel.writeInt(mAddress);
parcel.writeInt(mAttributes);
parcel.writeInt(mMaxPacketSize);
parcel.writeInt(mInterval);
}
}
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