thermal_zone_temperature_sensor.cc

// Copyright 2015 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "thermald/thermal_zone_temperature_sensor.h"

#include <string>

#include "base/files/file_util.h"
#include "base/logging.h"
#include "base/strings/stringprintf.h"

using std::stoi;
using std::string;
using std::to_string;

namespace thermald {

ThermalZoneTemperatureSensor::ThermalZoneTemperatureSensor(
    int zone_id, const string &sensor_name)
    : TemperatureSensorCommon(sensor_name),
      sysfs_attr_path_(base::StringPrintf(
          "/sys/class/thermal/thermal_zone%d/temp", zone_id)) {
}

ThermalZoneTemperatureSensor::ThermalZoneTemperatureSensor(int zone_id)
    : ThermalZoneTemperatureSensor(zone_id,
                                   "thermal_zone" + to_string(zone_id)) {
}

bool ThermalZoneTemperatureSensor::ReadTemperature(int *value) {
  DCHECK(value);

  string contents;

  if (!base::ReadFileToString(sysfs_attr_path_, &contents)) {
    LOG(ERROR) << "[" << name() << "] failed to read '"
               << sysfs_attr_path_.value() << "'";
    return false;
  }

  *value = stoi(contents);

  return true;
}

}  // namespace thermald