hwmon_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/hwmon_temperature_sensor.h"

#include <string>

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

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

namespace thermald {

HwmonTemperatureSensor::HwmonTemperatureSensor(int hwmon_dev_id, int sensor_id,
                                               const std::string &name)
    : TemperatureSensorCommon(name),
      sysfs_attr_input_(base::StringPrintf(
          "/sys/class/hwmon/hwmon%d/temp%d_input", hwmon_dev_id, sensor_id)) {
}

HwmonTemperatureSensor::HwmonTemperatureSensor(int hwmon_dev_id,
                                               int sensor_id)
    : HwmonTemperatureSensor(hwmon_dev_id, sensor_id,
                             base::StringPrintf("hwmon%d.temp%d", hwmon_dev_id,
                                                sensor_id)) {
}

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

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

  *value = stoi(contents);

  return true;
}

}  // namespace thermald