1 /* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.accessorydisplay.sink; 18 19 import com.android.accessorydisplay.common.Logger; 20 import com.android.accessorydisplay.common.Transport; 21 22 import android.hardware.usb.UsbDevice; 23 import android.hardware.usb.UsbDeviceConnection; 24 import android.hardware.usb.UsbEndpoint; 25 26 import java.io.IOException; 27 28 /** 29 * Sends or receives messages using bulk endpoints associated with a {@link UsbDevice} 30 * that represents a USB accessory. 31 */ 32 public class UsbAccessoryBulkTransport extends Transport { 33 private static final int TIMEOUT_MILLIS = 1000; 34 35 private UsbDeviceConnection mConnection; 36 private UsbEndpoint mBulkInEndpoint; 37 private UsbEndpoint mBulkOutEndpoint; 38 39 public UsbAccessoryBulkTransport(Logger logger, UsbDeviceConnection connection, 40 UsbEndpoint bulkInEndpoint, UsbEndpoint bulkOutEndpoint) { 41 super(logger, 16384); 42 mConnection = connection; 43 mBulkInEndpoint = bulkInEndpoint; 44 mBulkOutEndpoint = bulkOutEndpoint; 45 } 46 47 @Override 48 protected void ioClose() { 49 mConnection = null; 50 mBulkInEndpoint = null; 51 mBulkOutEndpoint = null; 52 } 53 54 @Override 55 protected int ioRead(byte[] buffer, int offset, int count) throws IOException { 56 if (mConnection == null) { 57 throw new IOException("Connection was closed."); 58 } 59 return mConnection.bulkTransfer(mBulkInEndpoint, buffer, offset, count, -1); 60 } 61 62 @Override 63 protected void ioWrite(byte[] buffer, int offset, int count) throws IOException { 64 if (mConnection == null) { 65 throw new IOException("Connection was closed."); 66 } 67 int result = mConnection.bulkTransfer(mBulkOutEndpoint, 68 buffer, offset, count, TIMEOUT_MILLIS); 69 if (result < 0) { 70 throw new IOException("Bulk transfer failed."); 71 } 72 } 73 } 74
