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 "IMtpHandle.h"
#include "MtpEventPacket.h"

#include <usbhost/usbhost.h>

namespace android {

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

MtpEventPacket::~MtpEventPacket() {
}

#ifdef MTP_DEVICE
int MtpEventPacket::write(IMtpHandle *h) {
    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 = h->sendEvent(event);
    return (ret < 0 ? ret : 0);
}
#endif

#ifdef MTP_HOST
int MtpEventPacket::sendRequest(struct usb_request *request) {
    request->buffer = mBuffer;
    request->buffer_length = mBufferSize;
    mPacketSize = 0;
    if (usb_request_queue(request)) {
        ALOGE("usb_endpoint_queue failed, errno: %d", errno);
        return -1;
    }
    return 0;
}

int MtpEventPacket::readResponse(struct usb_device *device) {
    struct usb_request* const req = usb_request_wait(device, -1);
    if (req) {
        mPacketSize = req->actual_length;
        return req->actual_length;
    } else {
        return -1;
    }
}
#endif

}  // namespace android