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/*
* Copyright (C) 2019 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.
*/
#pragma once
#include <list>
#include <map>
#include <sstream>
#include <string>
#include <android-base/unique_fd.h>
#include <log/log.h>
#include <sys/epoll.h>
#include <utils/Trace.h>
#include "utils.h"
namespace aidl {
namespace android {
namespace hardware {
namespace vibrator {
using ::android::base::unique_fd;
class HwApiBase {
private:
using NamesMap = std::map<const std::ios *, std::string>;
class RecordInterface {
public:
virtual std::string toString(const NamesMap &names) = 0;
virtual ~RecordInterface() {}
};
template <typename T>
class Record : public RecordInterface {
public:
Record(const char *func, const T &value, const std::ios *stream)
: mFunc(func), mValue(value), mStream(stream) {}
std::string toString(const NamesMap &names) override;
private:
const char *mFunc;
const T mValue;
const std::ios *mStream;
};
using Records = std::list<std::unique_ptr<RecordInterface>>;
static constexpr uint32_t RECORDS_SIZE = 32;
public:
HwApiBase();
void debug(int fd);
protected:
void saveName(const std::string &name, const std::ios *stream);
template <typename T>
void open(const std::string &name, T *stream);
bool has(const std::ios &stream);
template <typename T>
bool get(T *value, std::istream *stream);
template <typename T>
bool set(const T &value, std::ostream *stream);
template <typename T>
bool poll(const T &value, std::istream *stream, const int32_t timeout = -1);
template <typename T>
void record(const char *func, const T &value, const std::ios *stream);
private:
std::string mPathPrefix;
NamesMap mNames;
Records mRecords{RECORDS_SIZE};
std::mutex mRecordsMutex;
std::mutex mIoMutex;
};
#define HWAPI_RECORD(args...) HwApiBase::record(__FUNCTION__, ##args)
template <typename T>
void HwApiBase::open(const std::string &name, T *stream) {
saveName(name, stream);
utils::openNoCreate(mPathPrefix + name, stream);
}
template <typename T>
bool HwApiBase::get(T *value, std::istream *stream) {
ATRACE_NAME("HwApi::get");
std::scoped_lock ioLock{mIoMutex};
bool ret;
stream->seekg(0);
*stream >> *value;
if (!(ret = !!*stream)) {
ALOGE("Failed to read %s (%d): %s", mNames[stream].c_str(), errno, strerror(errno));
}
stream->clear();
HWAPI_RECORD(*value, stream);
return ret;
}
template <typename T>
bool HwApiBase::set(const T &value, std::ostream *stream) {
ATRACE_NAME("HwApi::set");
using utils::operator<<;
std::scoped_lock ioLock{mIoMutex};
bool ret;
*stream << value << std::endl;
if (!(ret = !!*stream)) {
ALOGE("Failed to write %s (%d): %s", mNames[stream].c_str(), errno, strerror(errno));
stream->clear();
}
HWAPI_RECORD(value, stream);
return ret;
}
template <typename T>
bool HwApiBase::poll(const T &value, std::istream *stream, const int32_t timeoutMs) {
ATRACE_NAME("HwApi::poll");
auto path = mPathPrefix + mNames[stream];
unique_fd fileFd{::open(path.c_str(), O_RDONLY)};
unique_fd epollFd{epoll_create(1)};
epoll_event event = {
.events = EPOLLPRI | EPOLLET,
};
T actual;
bool ret;
int epollRet;
if (timeoutMs < -1) {
ALOGE("Invalid polling timeout!");
return false;
}
if (epoll_ctl(epollFd, EPOLL_CTL_ADD, fileFd, &event)) {
ALOGE("Failed to poll %s (%d): %s", mNames[stream].c_str(), errno, strerror(errno));
return false;
}
while ((ret = get(&actual, stream)) && (actual != value)) {
epollRet = epoll_wait(epollFd, &event, 1, timeoutMs);
if (epollRet <= 0) {
ALOGE("Polling error or timeout! (%d)", epollRet);
return false;
}
}
HWAPI_RECORD(value, stream);
return ret;
}
template <typename T>
void HwApiBase::record(const char *func, const T &value, const std::ios *stream) {
std::lock_guard<std::mutex> lock(mRecordsMutex);
mRecords.emplace_back(std::make_unique<Record<T>>(func, value, stream));
mRecords.pop_front();
}
template <typename T>
std::string HwApiBase::Record<T>::toString(const NamesMap &names) {
using utils::operator<<;
std::stringstream ret;
ret << mFunc << " '" << names.at(mStream) << "' = '" << mValue << "'";
return ret.str();
}
class HwCalBase {
public:
HwCalBase();
void debug(int fd);
protected:
template <typename T>
bool getProperty(const char *key, T *value, const T defval);
template <typename T>
bool getPersist(const char *key, T *value);
private:
std::string mPropertyPrefix;
std::map<std::string, std::string> mCalData;
};
template <typename T>
bool HwCalBase::getProperty(const char *key, T *outval, const T defval) {
ATRACE_NAME("HwCal::getProperty");
*outval = utils::getProperty(mPropertyPrefix + key, defval);
return true;
}
template <typename T>
bool HwCalBase::getPersist(const char *key, T *value) {
ATRACE_NAME("HwCal::getPersist");
auto it = mCalData.find(key);
if (it == mCalData.end()) {
ALOGE("Missing %s config!", key);
return false;
}
std::stringstream stream{it->second};
utils::unpack(stream, value);
if (!stream || !stream.eof()) {
ALOGE("Invalid %s config!", key);
return false;
}
return true;
}
} // namespace vibrator
} // namespace hardware
} // namespace android
} // namespace aidl
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