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 <linux/aio_abi.h> 22 #include <mutex> 23 #include <sys/poll.h> 24 #include <time.h> 25 #include <thread> 26 #include <vector> 27 28 #include <IMtpHandle.h> 29 30 namespace android { 31 32 constexpr int NUM_IO_BUFS = 2; 33 34 struct io_buffer { 35 std::vector<struct iocb> iocbs; // Holds memory for all iocbs. Not used directly. 36 std::vector<struct iocb*> iocb; // Pointers to individual iocbs, for syscalls 37 std::vector<unsigned char> bufs; // A large buffer, used with filesystem io 38 std::vector<unsigned char*> buf; // Pointers within the larger buffer, for syscalls 39 unsigned actual; // The number of buffers submitted for this request 40 }; 41 42 template <class T> class MtpFfsHandleTest; 43 44 class MtpFfsHandle : public IMtpHandle { 45 template <class T> friend class MtpFfsHandleTest; 46 protected: 47 void closeConfig(); 48 void closeEndpoints(); 49 void advise(int fd); 50 int handleControlRequest(const struct usb_ctrlrequest *request); 51 int doAsync(void* data, size_t len, bool read, bool zero_packet); 52 int handleEvent(); 53 void cancelTransaction(); 54 void doSendEvent(mtp_event me); 55 bool openEndpoints(bool ptp); 56 57 static int getPacketSize(int ffs_fd); 58 59 bool mCanceled; 60 61 android::base::unique_fd mControl; 62 // "in" from the host's perspective => sink for mtp server 63 android::base::unique_fd mBulkIn; 64 // "out" from the host's perspective => source for mtp server 65 android::base::unique_fd mBulkOut; 66 android::base::unique_fd mIntr; 67 68 aio_context_t mCtx; 69 70 android::base::unique_fd mEventFd; 71 struct pollfd mPollFds[2]; 72 73 struct io_buffer mIobuf[NUM_IO_BUFS]; 74 75 // Submit an io request of given length. Return amount submitted or -1. 76 int iobufSubmit(struct io_buffer *buf, int fd, unsigned length, bool read); 77 78 // Cancel submitted requests from start to end in the given array. Return 0 or -1. 79 int cancelEvents(struct iocb **iocb, struct io_event *events, unsigned start, unsigned end); 80 81 // Wait for at minimum the given number of events. Returns the amount of data in the returned 82 // events. Increments counter by the number of events returned. 83 int waitEvents(struct io_buffer *buf, int min_events, struct io_event *events, int *counter); 84 85 public: 86 int read(void *data, size_t len) override; 87 int write(const void *data, size_t len) override; 88 89 int receiveFile(mtp_file_range mfr, bool zero_packet) override; 90 int sendFile(mtp_file_range mfr) override; 91 int sendEvent(mtp_event me) override; 92 93 int start(bool ptp) override; 94 void close() override; 95 96 bool writeDescriptors(bool ptp); 97 98 MtpFfsHandle(int controlFd); 99 ~MtpFfsHandle(); 100 }; 101 102 struct mtp_data_header { 103 /* length of packet, including this header */ 104 __le32 length; 105 /* container type (2 for data packet) */ 106 __le16 type; 107 /* MTP command code */ 108 __le16 command; 109 /* MTP transaction ID */ 110 __le32 transaction_id; 111 }; 112 113 } // namespace android 114 115 #endif // _MTP_FFS_HANDLE_H 116 117
