media/mtp/MtpEventPacket.cpp

/*
 * 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.
 */

#define LOG_TAG "MtpEventPacket"

#include <stdio.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sys/ioctl.h>

#ifdef MTP_DEVICE
#include <linux/usb/f_mtp.h>
#endif

#include "MtpEventPacket.h"

namespace android {

MtpEventPacket::MtpEventPacket()
    :   MtpPacket(512)
{
}

MtpEventPacket::~MtpEventPacket() {
}

#ifdef MTP_DEVICE
int MtpEventPacket::write(int fd) {
    struct mtp_event    event;

    putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
    putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_EVENT);

    event.data = mBuffer;
    event.length = mPacketSize;
    int ret = ::ioctl(fd, MTP_SEND_EVENT, (unsigned long)&event);
    return (ret < 0 ? ret : 0);
}
#endif

#ifdef MTP_HOST
    // read our buffer from the given endpoint
int MtpEventPacket::read(struct usb_endpoint *ep) {
    int ret = transfer(ep, mBuffer, mBufferSize);
     if (ret >= 0)
        mPacketSize = ret;
    else
        mPacketSize = 0;
    return ret;
}
#endif

}  // namespace android