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/*
* Copyright (C) 2021 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 SRC_TRACED_PROBES_POWER_LINUX_POWER_SYSFS_DATA_SOURCE_H_
#define SRC_TRACED_PROBES_POWER_LINUX_POWER_SYSFS_DATA_SOURCE_H_
#include "perfetto/ext/base/optional.h"
#include "perfetto/ext/base/weak_ptr.h"
#include "perfetto/tracing/core/data_source_config.h"
#include "src/traced/probes/probes_data_source.h"
namespace perfetto {
class BatteryInfo;
class TraceWriter;
namespace base {
class TaskRunner;
}
class LinuxPowerSysfsDataSource : public ProbesDataSource {
public:
class BatteryInfo {
public:
explicit BatteryInfo(
const char* power_supply_dir_path = "/sys/class/power_supply");
~BatteryInfo();
// The current coloumb counter value in µAh.
base::Optional<int64_t> GetChargeCounterUah(size_t battery_idx);
// The battery capacity in percent.
base::Optional<int64_t> GetCapacityPercent(size_t battery_idx);
// The current reading of the battery in µA.
base::Optional<int64_t> GetCurrentNowUa(size_t battery_idx);
// The smoothed current reading of the battery in µA.
base::Optional<int64_t> GetAverageCurrentUa(size_t battery_idx);
size_t num_batteries() const;
private:
// The subdirectories that contain info of a battery power supply, not
// USBPD, AC or other types of power supplies.
std::vector<std::string> sysfs_battery_dirs_;
};
static const ProbesDataSource::Descriptor descriptor;
LinuxPowerSysfsDataSource(DataSourceConfig,
base::TaskRunner*,
TracingSessionID,
std::unique_ptr<TraceWriter> writer);
~LinuxPowerSysfsDataSource() override;
base::WeakPtr<LinuxPowerSysfsDataSource> GetWeakPtr() const;
// ProbesDataSource implementation.
void Start() override;
void Flush(FlushRequestID, std::function<void()> callback) override;
// Use the default ClearIncrementalState() implementation: this data source
// doesn't have any incremental state.
private:
void Tick();
void WriteBatteryCounters();
uint32_t poll_interval_ms_ = 0;
base::TaskRunner* const task_runner_;
std::unique_ptr<TraceWriter> writer_;
std::unique_ptr<BatteryInfo> battery_info_;
base::WeakPtrFactory<LinuxPowerSysfsDataSource> weak_factory_; // Keep last.
};
} // namespace perfetto
#endif // SRC_TRACED_PROBES_POWER_LINUX_POWER_SYSFS_DATA_SOURCE_H_
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