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/*
* Copyright (C) 2018 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 THERMAL_UTILS_THERMAL_WATCHER_H_
#define THERMAL_UTILS_THERMAL_WATCHER_H_
#include <chrono>
#include <condition_variable>
#include <future>
#include <list>
#include <mutex>
#include <set>
#include <string>
#include <thread>
#include <unordered_map>
#include <vector>
#include <android-base/chrono_utils.h>
#include <android-base/unique_fd.h>
#include <utils/Looper.h>
#include <utils/Thread.h>
namespace android {
namespace hardware {
namespace thermal {
namespace V2_0 {
namespace implementation {
using android::base::boot_clock;
using android::base::unique_fd;
using WatcherCallback = std::function<bool(const std::set<std::string> &name)>;
// A helper class for monitoring thermal files changes.
class ThermalWatcher : public ::android::Thread {
public:
ThermalWatcher(const WatcherCallback &cb)
: Thread(false), cb_(cb), looper_(new Looper(true)) {}
~ThermalWatcher() = default;
// Disallow copy and assign.
ThermalWatcher(const ThermalWatcher &) = delete;
void operator=(const ThermalWatcher &) = delete;
// Start the thread and return true if it succeeds.
bool startWatchingDeviceFiles();
// Give the file watcher a list of files to start watching. This helper
// class will by default wait for modifications to the file with a looper.
// This should be called before starting watcher thread.
void registerFilesToWatch(const std::set<std::string> &sensors_to_watch, bool uevent_monitor);
// Wake up the looper thus the worker thread, immediately. This can be called
// in any thread.
void wake();
private:
// The work done by the watcher thread. This will use inotify to check for
// modifications to the files to watch. If any modification is seen this
// will callback the registered function with the new data read from the
// modified file.
bool threadLoop() override;
// Parse uevent message
void parseUevent(std::set<std::string> *sensor_name);
// Maps watcher filer descriptor to watched file path.
std::unordered_map<int, std::string> watch_to_file_path_map_;
// The callback function. Called whenever thermal uevent is seen.
// The function passed in should expect a string in the form (type).
// Where type is the name of the thermal zone that trigger a uevent notification.
// Callback will return thermal trigger status for next polling decision.
const WatcherCallback cb_;
sp<Looper> looper_;
// For uevent socket registration.
android::base::unique_fd uevent_fd_;
// Sensor list which monitor flag is enabled.
std::set<std::string> monitored_sensors_;
// Flag to point out if any sensor across the first threshold.
bool thermal_triggered_;
// Flag to point out if device can support uevent notify.
bool is_polling_;
// Timestamp for last thermal update
boot_clock::time_point last_update_time_;
};
} // namespace implementation
} // namespace V2_0
} // namespace thermal
} // namespace hardware
} // namespace android
#endif // THERMAL_UTILS_THERMAL_WATCHER_H_
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