blob: 8f8b398107a1192e56819e51980f113baa9a1cfd [file] [log] [blame]
* Copyright (C) 2022 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#pragma once
#include <android-base/chrono_utils.h>
#include <android-base/unique_fd.h>
#include <linux/genetlink.h>
#include <netlink/genl/ctrl.h>
#include <netlink/genl/genl.h>
#include <utils/Looper.h>
#include <utils/Thread.h>
#include <chrono>
#include <condition_variable>
#include <future>
#include <list>
#include <mutex>
#include <set>
#include <string>
#include <thread>
#include <unordered_map>
#include <vector>
namespace aidl {
namespace android {
namespace hardware {
namespace thermal {
namespace implementation {
using ::android::base::boot_clock;
using ::android::base::unique_fd;
using WatcherCallback = std::function<std::chrono::milliseconds(const std::set<std::string> &name)>;
// A helper class for monitoring thermal files changes.
class ThermalWatcher : public ::android::Thread {
explicit ThermalWatcher(const WatcherCallback &cb)
: Thread(false), cb_(cb), looper_(new ::android::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.
// For monitoring uevents.
void registerFilesToWatch(const std::set<std::string> &sensors_to_watch);
// For monitoring thermal genl events.
void registerFilesToWatchNl(const std::set<std::string> &sensors_to_watch);
// Wake up the looper thus the worker thread, immediately. This can be called
// in any thread.
void wake();
// 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);
// Parse thermal netlink message
void parseGenlink(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_;
::android::sp<::android::Looper> looper_;
// For uevent socket registration.
::android::base::unique_fd uevent_fd_;
// For thermal genl socket registration.
::android::base::unique_fd thermal_genl_fd_;
// Sensor list which monitor flag is enabled.
std::set<std::string> monitored_sensors_;
// Sleep interval voting result
std::chrono::milliseconds sleep_ms_;
// Timestamp for last thermal update
boot_clock::time_point last_update_time_;
// For thermal genl socket object.
struct nl_sock *sk_thermal;
} // namespace implementation
} // namespace thermal
} // namespace hardware
} // namespace android
} // namespace aidl