1 /*
2  * Copyright (C) 2016 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 #ifndef _MTP_FFS_HANDLE_H
18 #define _MTP_FFS_HANDLE_H
19 
20 #include <android-base/unique_fd.h>
21 #include <IMtpHandle.h>
22 
23 namespace android {
24 
25 class MtpFfsHandleTest;
26 
27 class MtpFfsHandle : public IMtpHandle {
28     friend class android::MtpFfsHandleTest;
29 private:
30     int writeHandle(int fd, const void *data, int len);
31     int readHandle(int fd, void *data, int len);
32     int spliceReadHandle(int fd, int fd_out, int len);
33     bool initFunctionfs();
34     void closeConfig();
35     void closeEndpoints();
36 
37     bool mPtp;
38 
39     std::timed_mutex mLock;
40 
41     android::base::unique_fd mControl;
42     // "in" from the host's perspective => sink for mtp server
43     android::base::unique_fd mBulkIn;
44     // "out" from the host's perspective => source for mtp server
45     android::base::unique_fd mBulkOut;
46     android::base::unique_fd mIntr;
47 
48     int mMaxWrite;
49     int mMaxRead;
50 
51     std::vector<char> mBuffer1;
52     std::vector<char> mBuffer2;
53 
54 public:
55     int read(void *data, int len);
56     int write(const void *data, int len);
57 
58     int receiveFile(mtp_file_range mfr, bool zero_packet);
59     int sendFile(mtp_file_range mfr);
60     int sendEvent(mtp_event me);
61 
62     /**
63      * Open ffs endpoints and allocate necessary kernel and user memory.
64      * Will sleep until endpoints are enabled, for up to 1 second.
65      */
66     int start();
67     void close();
68 
69     int configure(bool ptp);
70 
71     MtpFfsHandle();
72     ~MtpFfsHandle();
73 };
74 
75 struct mtp_data_header {
76     /* length of packet, including this header */
77     __le32 length;
78     /* container type (2 for data packet) */
79     __le16 type;
80     /* MTP command code */
81     __le16 command;
82     /* MTP transaction ID */
83     __le32 transaction_id;
84 };
85 
86 } // namespace android
87 
88 #endif // _MTP_FF_HANDLE_H
89 
90