/*
* Copyright (C) 2016 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.
*/
#ifndef _MTP_FFS_HANDLE_H
#define _MTP_FFS_HANDLE_H
#include <android-base/unique_fd.h>
#include <linux/aio_abi.h>
#include <mutex>
#include <sys/poll.h>
#include <time.h>
#include <thread>
#include <vector>
#include <IMtpHandle.h>
constexpr int NUM_IO_BUFS = 2;
struct io_buffer {
std::vector<struct iocb> iocbs; // Holds memory for all iocbs. Not used directly.
std::vector<struct iocb*> iocb; // Pointers to individual iocbs, for syscalls
std::vector<unsigned char> bufs; // A large buffer, used with filesystem io
std::vector<unsigned char*> buf; // Pointers within the larger buffer, for syscalls
unsigned actual; // The number of buffers submitted for this request
};
template <class T> class MtpFfsHandleTest;
class MtpFfsHandle : public IMtpHandle {
template <class T> friend class MtpFfsHandleTest;
protected:
void closeConfig();
void closeEndpoints();
void advise(int fd);
int handleControlRequest(const struct usb_ctrlrequest *request);
int doAsync(void* data, size_t len, bool read, bool zero_packet);
int handleEvent();
void cancelTransaction();
void doSendEvent(mtp_event me);
bool openEndpoints(bool ptp);
static int getPacketSize(int ffs_fd);
bool mCanceled;
android::base::unique_fd mControl;
// "in" from the host's perspective => sink for mtp server
android::base::unique_fd mBulkIn;
// "out" from the host's perspective => source for mtp server
android::base::unique_fd mBulkOut;
android::base::unique_fd mIntr;
aio_context_t mCtx;
android::base::unique_fd mEventFd;
struct pollfd mPollFds[2];
struct io_buffer mIobuf[NUM_IO_BUFS];
// Submit an io request of given length. Return amount submitted or -1.
int iobufSubmit(struct io_buffer *buf, int fd, unsigned length, bool read);
// Cancel submitted requests from start to end in the given array. Return 0 or -1.
int cancelEvents(struct iocb **iocb, struct io_event *events, unsigned start, unsigned end);
// Wait for at minimum the given number of events. Returns the amount of data in the returned
// events. Increments counter by the number of events returned.
int waitEvents(struct io_buffer *buf, int min_events, struct io_event *events, int *counter);
public:
int read(void *data, size_t len) override;
int write(const void *data, size_t len) override;
int receiveFile(mtp_file_range mfr, bool zero_packet) override;
int sendFile(mtp_file_range mfr) override;
int sendEvent(mtp_event me) override;
int start(bool ptp) override;
void close() override;
bool writeDescriptors(bool ptp);
MtpFfsHandle(int controlFd);
~MtpFfsHandle();
};
struct mtp_data_header {
/* length of packet, including this header */
__le32 length;
/* container type (2 for data packet) */
__le16 type;
/* MTP command code */
__le16 command;
/* MTP transaction ID */
__le32 transaction_id;
};
#endif // _MTP_FFS_HANDLE_H
