cooling_device.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/cooling_device.h"

#include <string>

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

using std::string;

namespace thermald {

CoolingDevice::CoolingDevice(int id)
    : id_(id),
      cur_state_attr_(
          base::StringPrintf("/sys/class/thermal/cooling_device%d/cur_state",
                             id)) {
}

bool CoolingDevice::SetThrottleState(int state) {
  string str_state(base::NumberToString(state));
  if (WriteFile(cur_state_attr_, str_state.c_str(), str_state.length()) !=
      static_cast<int>(str_state.length())) {
    LOG(ERROR) << "[" << id_ <<  "] Failed to write '"
               << cur_state_attr_.value() << "'";
    return false;
  }

  return true;
}

bool CoolingDevice::GetThrottleState(int *state) const {
  string contents;
  if (!base::ReadFileToString(cur_state_attr_, &contents)) {
    LOG(ERROR) << "[" << id_ <<  "] Failed to read '"
               << cur_state_attr_.value() << "'";
    return false;
  }

  base::TrimWhitespaceASCII(contents, base::TRIM_TRAILING, &contents);
  return base::StringToInt(contents, state);
}

}  // namespace thermald