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/properties.h> 21 #include <android-base/unique_fd.h> 22 #include <linux/aio_abi.h> 23 #include <mutex> 24 #include <sys/poll.h> 25 #include <time.h> 26 #include <thread> 27 #include <vector> 28 29 #include <IMtpHandle.h> 30 31 namespace android { 32 33 constexpr int NUM_IO_BUFS = 2; 34 35 struct io_buffer { 36 std::vector<struct iocb> iocbs; // Holds memory for all iocbs. Not used directly. 37 std::vector<struct iocb*> iocb; // Pointers to individual iocbs, for syscalls 38 std::vector<unsigned char> bufs; // A large buffer, used with filesystem io 39 std::vector<unsigned char*> buf; // Pointers within the larger buffer, for syscalls 40 unsigned actual; // The number of buffers submitted for this request 41 }; 42 43 template <class T> class MtpFfsHandleTest; 44 45 class MtpFfsHandle : public IMtpHandle { 46 template <class T> friend class MtpFfsHandleTest; 47 protected: 48 void closeConfig(); 49 void closeEndpoints(); 50 void advise(int fd); 51 int handleControlRequest(const struct usb_ctrlrequest *request); 52 int doAsync(void* data, size_t len, bool read, bool zero_packet); 53 int handleEvent(); 54 void cancelTransaction(); 55 void doSendEvent(mtp_event me); 56 bool openEndpoints(bool ptp); 57 58 static int getPacketSize(int ffs_fd); 59 60 bool mCanceled; 61 bool mBatchCancel; 62 63 std::vector<std::thread> mChildThreads; 64 65 android::base::unique_fd mControl; 66 // "in" from the host's perspective => sink for mtp server 67 android::base::unique_fd mBulkIn; 68 // "out" from the host's perspective => source for mtp server 69 android::base::unique_fd mBulkOut; 70 android::base::unique_fd mIntr; 71 72 aio_context_t mCtx; 73 74 android::base::unique_fd mEventFd; 75 struct pollfd mPollFds[2]; 76 77 struct io_buffer mIobuf[NUM_IO_BUFS]; 78 79 // Submit an io request of given length. Return amount submitted or -1. 80 int iobufSubmit(struct io_buffer *buf, int fd, unsigned length, bool read); 81 82 // Cancel submitted requests from start to end in the given array. Return 0 or -1. 83 int cancelEvents(struct iocb **iocb, struct io_event *events, unsigned start, unsigned end, 84 bool is_batch_cancel); 85 86 // Wait for at minimum the given number of events. Returns the amount of data in the returned 87 // events. Increments counter by the number of events returned. 88 int waitEvents(struct io_buffer *buf, int min_events, struct io_event *events, int *counter); 89 90 public: 91 int read(void *data, size_t len) override; 92 int write(const void *data, size_t len) override; 93 94 int receiveFile(mtp_file_range mfr, bool zero_packet) override; 95 int sendFile(mtp_file_range mfr) override; 96 int sendEvent(mtp_event me) override; 97 98 int start(bool ptp) override; 99 void close() override; 100 101 bool writeDescriptors(bool ptp); 102 103 MtpFfsHandle(int controlFd); 104 ~MtpFfsHandle(); 105 }; 106 107 struct mtp_data_header { 108 /* length of packet, including this header */ 109 __le32 length; 110 /* container type (2 for data packet) */ 111 __le16 type; 112 /* MTP command code */ 113 __le16 command; 114 /* MTP transaction ID */ 115 __le32 transaction_id; 116 }; 117 118 } // namespace android 119 120 #endif // _MTP_FFS_HANDLE_H 121 122