| /* |
| * Copyright (C) 2017 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 com.android.server.usb.descriptors; |
| |
| /** |
| * @hide |
| * A Usb Endpoint Descriptor. |
| * see usb11.pdf section 9.6.4 |
| */ |
| public class UsbEndpointDescriptor extends UsbDescriptor { |
| private static final String TAG = "EndPoint"; |
| |
| public static final byte MASK_ENDPOINT_ADDRESS = 0b0001111; |
| public static final byte MASK_ENDPOINT_DIRECTION = (byte) 0b10000000; |
| public static final byte DIRECTION_OUTPUT = 0x00; |
| public static final byte DIRECTION_INPUT = (byte) 0x80; |
| |
| public static final byte MASK_ATTRIBS_TRANSTYPE = 0b00000011; |
| public static final byte TRANSTYPE_CONTROL = 0x00; |
| public static final byte TRANSTYPE_ISO = 0x01; |
| public static final byte TRANSTYPE_BULK = 0x02; |
| public static final byte TRANSTYPE_INTERRUPT = 0x03; |
| |
| public static final byte MASK_ATTRIBS_SYNCTYPE = 0b00001100; |
| public static final byte SYNCTYPE_NONE = 0b00000000; |
| public static final byte SYNCTYPE_ASYNC = 0b00000100; |
| public static final byte SYNCTYPE_ADAPTSYNC = 0b00001000; |
| public static final byte SYNCTYPE_RESERVED = 0b00001100; |
| |
| public static final byte MASK_ATTRIBS_USEAGE = 0b00110000; |
| public static final byte USEAGE_DATA = 0b00000000; |
| public static final byte USEAGE_FEEDBACK = 0b00010000; |
| public static final byte USEAGE_EXPLICIT = 0b00100000; |
| public static final byte USEAGE_RESERVED = 0b00110000; |
| |
| private byte mEndpointAddress; // 2:1 Endpoint Address |
| // Bits 0..3b Endpoint Number. |
| // Bits 4..6b Reserved. Set to Zero |
| // Bits 7 Direction 0 = Out, 1 = In |
| // (Ignored for Control Endpoints) |
| private byte mAttributes; // 3:1 Various flags |
| // Bits 0..1 Transfer Type: |
| // 00 = Control, 01 = Isochronous, 10 = Bulk, 11 = Interrupt |
| // Bits 2..7 are reserved. If Isochronous endpoint, |
| // Bits 3..2 = Synchronisation Type (Iso Mode) |
| // 00 = No Synchonisation |
| // 01 = Asynchronous |
| // 10 = Adaptive |
| // 11 = Synchronous |
| // Bits 5..4 = Usage Type (Iso Mode) |
| // 00: Data Endpoint |
| // 01:Feedback Endpoint 10 |
| // Explicit Feedback Data Endpoint |
| // 11: Reserved |
| private int mPacketSize; // 4:2 Maximum Packet Size this endpoint is capable of |
| // sending or receiving |
| private byte mInterval; // 6:1 Interval for polling endpoint data transfers. Value in |
| // frame counts. |
| // Ignored for Bulk & Control Endpoints. Isochronous must equal |
| // 1 and field may range from 1 to 255 for interrupt endpoints. |
| private byte mRefresh; |
| private byte mSyncAddress; |
| |
| public UsbEndpointDescriptor(int length, byte type) { |
| super(length, type); |
| } |
| |
| public byte getEndpointAddress() { |
| return mEndpointAddress; |
| } |
| |
| public byte getAttributes() { |
| return mAttributes; |
| } |
| |
| public int getPacketSize() { |
| return mPacketSize; |
| } |
| |
| public byte getInterval() { |
| return mInterval; |
| } |
| |
| public byte getRefresh() { |
| return mRefresh; |
| } |
| |
| public byte getSyncAddress() { |
| return mSyncAddress; |
| } |
| |
| @Override |
| public int parseRawDescriptors(ByteStream stream) { |
| mEndpointAddress = stream.getByte(); |
| mAttributes = stream.getByte(); |
| mPacketSize = stream.unpackUsbWord(); |
| mInterval = stream.getByte(); |
| if (mLength == 9) { |
| mRefresh = stream.getByte(); |
| mSyncAddress = stream.getByte(); |
| } |
| return mLength; |
| } |
| } |