blob: f1f46db27a24af68ccf465f6061421d753792507 [file] [log] [blame]
/**
* Copyright © 2016 IBM Corporation
*
* 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.
*/
#include <cstdlib>
#include <memory>
#include "sysfs.hpp"
#include "util.hpp"
#include "directory.hpp"
std::string findHwmon(const std::string& ofNode)
{
static constexpr auto hwmonRoot = "/sys/class/hwmon";
std::string fullOfPath{"/sys/firmware/devicetree/base"};
fullOfPath.append(ofNode);
std::string hwmonInst;
Directory d(hwmonRoot);
while (d.next(hwmonInst))
{
std::string hwmonPath{hwmonRoot};
hwmonPath.append(1, '/');
hwmonPath.append(hwmonInst);
std::string path{hwmonPath};
path.append(1, '/');
path.append("of_node");
auto real = std::unique_ptr<char, phosphor::utility::Free<char>>(realpath(
path.c_str(), nullptr));
if (!real || real.get() != fullOfPath)
{
continue;
}
return hwmonPath;
}
return std::string();
}
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