MtpEventPacket.cpp revision 8a7ffae09a019de7109b30c505561c453910bde1 
1/*
2 * Copyright (C) 2010 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#define LOG_TAG "MtpEventPacket"
18
19#include <stdio.h>
20#include <sys/types.h>
21#include <fcntl.h>
22#include <sys/ioctl.h>
23
24#ifdef MTP_DEVICE
25#include <linux/usb/f_mtp.h>
26#endif
27
28#include "MtpEventPacket.h"
29
30#include <usbhost/usbhost.h>
31
32namespace android {
33
34MtpEventPacket::MtpEventPacket()
35    :   MtpPacket(512)
36{
37}
38
39MtpEventPacket::~MtpEventPacket() {
40}
41
42#ifdef MTP_DEVICE
43int MtpEventPacket::write(int fd) {
44    struct mtp_event    event;
45
46    putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
47    putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_EVENT);
48
49    event.data = mBuffer;
50    event.length = mPacketSize;
51    int ret = ::ioctl(fd, MTP_SEND_EVENT, (unsigned long)&event);
52    return (ret < 0 ? ret : 0);
53}
54#endif
55
56#ifdef MTP_HOST
57int MtpEventPacket::sendRequest(struct usb_request *request) {
58    request->buffer = mBuffer;
59    request->buffer_length = mBufferSize;
60    mPacketSize = 0;
61    if (usb_request_queue(request)) {
62        ALOGE("usb_endpoint_queue failed, errno: %d", errno);
63        return -1;
64    }
65    return 0;
66}
67
68int MtpEventPacket::readResponse(struct usb_device *device) {
69    struct usb_request* const req = usb_request_wait(device);
70    if (req) {
71        mPacketSize = req->actual_length;
72        return req->actual_length;
73    } else {
74        return -1;
75    }
76}
77#endif
78
79}  // namespace android
80