1 /** 2 * Copyright © 2016 IBM Corporation 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 #include <cstdlib> 17 #include <memory> 18 #include "sysfs.hpp" 19 #include "util.hpp" 20 #include "directory.hpp" 21 22 std::string findHwmon(const std::string& ofNode) 23 { 24 static constexpr auto hwmonRoot = "/sys/class/hwmon"; 25 26 std::string fullOfPath{"/sys/firmware/devicetree/base"}; 27 fullOfPath.append(ofNode); 28 29 std::string hwmonInst; 30 Directory d(hwmonRoot); 31 32 while (d.next(hwmonInst)) 33 { 34 std::string hwmonPath{hwmonRoot}; 35 hwmonPath.append(1, '/'); 36 hwmonPath.append(hwmonInst); 37 std::string path{hwmonPath}; 38 path.append(1, '/'); 39 path.append("of_node"); 40 41 auto real = std::unique_ptr<char, phosphor::utility::Free<char>>(realpath( 42 path.c_str(), nullptr)); 43 if (!real || real.get() != fullOfPath) 44 { 45 continue; 46 } 47 48 return hwmonPath; 49 } 50 51 return std::string(); 52 } 53 54 // vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4 55