Refactored Mtp driver interface into multiple classes. (487be61f) · Commits · e / os / android_frameworks_av

media/mtp/Android.mk

+8 −3

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		@@ -19,26 +19,31 @@ LOCAL_PATH:= $(call my-dir)
		include $(CLEAR_VARS)

		LOCAL_SRC_FILES:= \
		AsyncIO.cpp \
		MtpDataPacket.cpp \
		MtpDebug.cpp \
		MtpDevHandle.cpp \
		MtpDevice.cpp \
		MtpEventPacket.cpp \
		MtpDeviceInfo.cpp \
		MtpEventPacket.cpp \
		MtpFfsHandle.cpp \
		MtpObjectInfo.cpp \
		MtpPacket.cpp \
		MtpProperty.cpp \
		MtpRequestPacket.cpp \
		MtpResponsePacket.cpp \
		MtpServer.cpp \
		MtpStorage.cpp \
		MtpStorageInfo.cpp \
		MtpStringBuffer.cpp \
		MtpStorage.cpp \
		MtpUtils.cpp \

		LOCAL_MODULE:= libmtp

		LOCAL_CFLAGS := -DMTP_DEVICE -DMTP_HOST -Wall -Wextra -Werror

		LOCAL_SHARED_LIBRARIES := libutils libcutils liblog libusbhost libbinder
		LOCAL_SHARED_LIBRARIES := libbase libutils libcutils liblog libusbhost libbinder

		include $(BUILD_SHARED_LIBRARY)

		include $(call all-makefiles-under,$(LOCAL_PATH))

media/mtp/AsyncIO.cpp

0 → 100644

+176 −0

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		/*
		* 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.
		*/

		#include <android-base/logging.h>
		#include <condition_variable>
		#include <memory>
		#include <mutex>
		#include <queue>

		#include "AsyncIO.h"

		namespace {

		void read_func(struct aiocb *aiocbp) {
		aiocbp->ret = TEMP_FAILURE_RETRY(pread(aiocbp->aio_fildes,
		aiocbp->aio_buf, aiocbp->aio_nbytes, aiocbp->aio_offset));
		if (aiocbp->ret == -1) aiocbp->error = errno;
		}

		void write_func(struct aiocb *aiocbp) {
		aiocbp->ret = TEMP_FAILURE_RETRY(pwrite(aiocbp->aio_fildes,
		aiocbp->aio_buf, aiocbp->aio_nbytes, aiocbp->aio_offset));
		if (aiocbp->ret == -1) aiocbp->error = errno;
		}

		void splice_read_func(struct aiocb *aiocbp) {
		aiocbp->ret = TEMP_FAILURE_RETRY(splice(aiocbp->aio_fildes,
		(off64_t*) &aiocbp->aio_offset, aiocbp->aio_sink,
		NULL, aiocbp->aio_nbytes, 0));
		if (aiocbp->ret == -1) aiocbp->error = errno;
		}

		void splice_write_func(struct aiocb *aiocbp) {
		aiocbp->ret = TEMP_FAILURE_RETRY(splice(aiocbp->aio_fildes, NULL,
		aiocbp->aio_sink, (off64_t*) &aiocbp->aio_offset,
		aiocbp->aio_nbytes, 0));
		if (aiocbp->ret == -1) aiocbp->error = errno;
		}

		std::queue<std::unique_ptr<struct aiocb>> queue;
		std::mutex queue_lock;
		std::condition_variable queue_cond;
		std::condition_variable write_cond;
		int done = 1;
		void splice_write_pool_func(int) {
		while(1) {
		std::unique_lock<std::mutex> lk(queue_lock);
		queue_cond.wait(lk, []{return !queue.empty() \|\| done;});
		if (queue.empty() && done) {
		return;
		}
		std::unique_ptr<struct aiocb> aiocbp = std::move(queue.front());
		queue.pop();
		lk.unlock();
		write_cond.notify_one();
		splice_write_func(aiocbp.get());
		close(aiocbp->aio_fildes);
		}
		}

		void write_pool_func(int) {
		while(1) {
		std::unique_lock<std::mutex> lk(queue_lock);
		queue_cond.wait(lk, []{return !queue.empty() \|\| done;});
		if (queue.empty() && done) {
		return;
		}
		std::unique_ptr<struct aiocb> aiocbp = std::move(queue.front());
		queue.pop();
		lk.unlock();
		write_cond.notify_one();
		aiocbp->ret = TEMP_FAILURE_RETRY(pwrite(aiocbp->aio_fildes,
		aiocbp->aio_pool_buf.get(), aiocbp->aio_nbytes, aiocbp->aio_offset));
		if (aiocbp->ret == -1) aiocbp->error = errno;
		}
		}

		constexpr int NUM_THREADS = 1;
		constexpr int MAX_QUEUE_SIZE = 10;
		std::thread pool[NUM_THREADS];

		} // end anonymous namespace

		void aio_pool_init(void(f)(int)) {
		CHECK(done == 1);
		done = 0;
		for (int i = 0; i < NUM_THREADS; i++) {
		pool[i] = std::thread(f, i);
		}
		}

		void aio_pool_splice_init() {
		aio_pool_init(splice_write_pool_func);
		}

		void aio_pool_write_init() {
		aio_pool_init(write_pool_func);
		}

		void aio_pool_end() {
		done = 1;
		for (int i = 0; i < NUM_THREADS; i++) {
		std::unique_lock<std::mutex> lk(queue_lock);
		lk.unlock();
		queue_cond.notify_one();
		}

		for (int i = 0; i < NUM_THREADS; i++) {
		pool[i].join();
		}
		}

		// used for both writes and splices depending on which init was used before.
		int aio_pool_write(struct aiocb *aiocbp) {
		std::unique_lock<std::mutex> lk(queue_lock);
		write_cond.wait(lk, []{return queue.size() < MAX_QUEUE_SIZE;});
		queue.push(std::unique_ptr<struct aiocb>(aiocbp));
		lk.unlock();
		queue_cond.notify_one();
		return 0;
		}

		int aio_read(struct aiocb *aiocbp) {
		aiocbp->thread = std::thread(read_func, aiocbp);
		return 0;
		}

		int aio_write(struct aiocb *aiocbp) {
		aiocbp->thread = std::thread(write_func, aiocbp);
		return 0;
		}

		int aio_splice_read(struct aiocb *aiocbp) {
		aiocbp->thread = std::thread(splice_read_func, aiocbp);
		return 0;
		}

		int aio_splice_write(struct aiocb *aiocbp) {
		aiocbp->thread = std::thread(splice_write_func, aiocbp);
		return 0;
		}

		int aio_error(const struct aiocb *aiocbp) {
		return aiocbp->error;
		}

		ssize_t aio_return(struct aiocb *aiocbp) {
		return aiocbp->ret;
		}

		int aio_suspend(struct aiocb *aiocbp[], int n,
		const struct timespec *) {
		for (int i = 0; i < n; i++) {
		aiocbp[i]->thread.join();
		}
		return 0;
		}

		int aio_cancel(int, struct aiocb *) {
		// Not implemented
		return -1;
		}

media/mtp/AsyncIO.h

0 → 100644

+77 −0

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		/*
		* 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 _ASYNCIO_H
		#define _ASYNCIO_H

		#include <fcntl.h>
		#include <linux/aio_abi.h>
		#include <memory>
		#include <signal.h>
		#include <sys/cdefs.h>
		#include <sys/types.h>
		#include <time.h>
		#include <thread>
		#include <unistd.h>

		/**
		* Provides a subset of POSIX aio operations, as well
		* as similar operations with splice and threadpools.
		*/

		struct aiocb {
		int aio_fildes; // Assumed to be the source for splices
		void *aio_buf; // Unused for splices

		// Used for threadpool operations only, freed automatically
		std::unique_ptr<char[]> aio_pool_buf;

		off_t aio_offset;
		size_t aio_nbytes;

		int aio_sink; // Unused for non splice r/w

		// Used internally
		std::thread thread;
		ssize_t ret;
		int error;
		};

		// Submit a request for IO to be completed
		int aio_read(struct aiocb *);
		int aio_write(struct aiocb *);
		int aio_splice_read(struct aiocb *);
		int aio_splice_write(struct aiocb *);

		// Suspend current thread until given IO is complete, at which point
		// its return value and any errors can be accessed
		int aio_suspend(struct aiocb [], int, const struct timespec );
		int aio_error(const struct aiocb *);
		ssize_t aio_return(struct aiocb *);
		int aio_cancel(int, struct aiocb *);

		// Initialize a threadpool to perform IO. Only one pool can be
		// running at a time.
		void aio_pool_write_init();
		void aio_pool_splice_init();
		// Suspend current thread until all queued work is complete, then ends the threadpool
		void aio_pool_end();
		// Submit IO work for the threadpool to complete. Memory associated with the work is
		// freed automatically when the work is complete.
		int aio_pool_write(struct aiocb *);

		#endif // ASYNCIO_H

media/mtp/IMtpHandle.h

0 → 100644

+47 −0

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		/*
		* 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 _IMTP_HANDLE_H
		#define _IMTP_HANDLE_H

		#include <linux/usb/f_mtp.h>

		constexpr char FFS_MTP_EP0[] = "/dev/usb-ffs/mtp/ep0";

		class IMtpHandle {
		public:
		// Return number of bytes read/written, or -1 and errno is set
		virtual int read(void *data, int len) = 0;
		virtual int write(const void *data, int len) = 0;

		// Return 0 if send/receive is successful, or -1 and errno is set
		virtual int receiveFile(mtp_file_range mfr) = 0;
		virtual int sendFile(mtp_file_range mfr) = 0;
		virtual int sendEvent(mtp_event me) = 0;

		// Return 0 if operation is successful, or -1 else
		virtual int start() = 0;
		virtual int configure(bool ptp) = 0;

		virtual void close() = 0;

		virtual ~IMtpHandle() {}
		};

		IMtpHandle *get_ffs_handle();
		IMtpHandle *get_mtp_handle();

		#endif // _IMTP_HANDLE_H

media/mtp/MtpDataPacket.cpp

+8 −7

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		@@ -24,6 +24,7 @@

		#include "MtpDataPacket.h"
		#include "MtpStringBuffer.h"
		#include "IMtpHandle.h"

		namespace android {

		@@ -418,8 +419,8 @@ void MtpDataPacket::putString(const uint16_t* string) {
		}

		#ifdef MTP_DEVICE
		int MtpDataPacket::read(int fd) {
		int ret = ::read(fd, mBuffer, MTP_BUFFER_SIZE);
		int MtpDataPacket::read(IMtpHandle *h) {
		int ret = h->read(mBuffer, MTP_BUFFER_SIZE);
		if (ret < MTP_CONTAINER_HEADER_SIZE)
		return -1;
		mPacketSize = ret;
		@@ -427,20 +428,20 @@ int MtpDataPacket::read(int fd) {
		return ret;
		}

		int MtpDataPacket::write(int fd) {
		int MtpDataPacket::write(IMtpHandle *h) {
		MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, mPacketSize);
		MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);
		int ret = ::write(fd, mBuffer, mPacketSize);
		int ret = h->write(mBuffer, mPacketSize);
		return (ret < 0 ? ret : 0);
		}

		int MtpDataPacket::writeData(int fd, void* data, uint32_t length) {
		int MtpDataPacket::writeData(IMtpHandle h, void data, uint32_t length) {
		allocate(length + MTP_CONTAINER_HEADER_SIZE);
		memcpy(mBuffer + MTP_CONTAINER_HEADER_SIZE, data, length);
		length += MTP_CONTAINER_HEADER_SIZE;
		MtpPacket::putUInt32(MTP_CONTAINER_LENGTH_OFFSET, length);
		MtpPacket::putUInt16(MTP_CONTAINER_TYPE_OFFSET, MTP_CONTAINER_TYPE_DATA);
		int ret = ::write(fd, mBuffer, length);
		int ret = h->write(mBuffer, length);
		return (ret < 0 ? ret : 0);
		}