1 #pragma once 2 3 #include <chrono> 4 #include <exception> 5 #include <fstream> 6 #include <string> 7 8 namespace sysfs 9 { 10 11 inline std::string make_sysfs_path(const std::string& path, 12 const std::string& type, 13 const std::string& id, 14 const std::string& entry) 15 { 16 using namespace std::literals; 17 18 if (entry.empty()) 19 { 20 return path + "/"s + type + id; 21 } 22 23 return path + "/"s + type + id + "_"s + entry; 24 } 25 26 /** @brief Return the path to the phandle file matching value in io-channels. 27 * 28 * This function will take two passed in paths. 29 * One path is used to find the io-channels file. 30 * The other path is used to find the phandle file. 31 * The 4 byte phandle value is read from the phandle file(s). 32 * The 4 byte phandle value and 4 byte index value is read from io-channels. 33 * When a match is found, the path to the matching phandle file is returned. 34 * 35 * @param[in] iochanneldir - Path to file for getting phandle from io-channels 36 * @param[in] phandledir - Path to use for reading from phandle file 37 * 38 * @return Path to phandle file with value matching that in io-channels 39 */ 40 std::string findPhandleMatch(const std::string& iochanneldir, 41 const std::string& phandledir); 42 43 /** @brief Find hwmon instances from an open-firmware device tree path 44 * 45 * Look for a matching hwmon instance given an 46 * open firmware device path. 47 * 48 * @param[in] ofNode- The open firmware device path. 49 * 50 * @returns[in] - The hwmon instance path or an empty 51 * string if no match is found. 52 */ 53 std::string findHwmonFromOFPath(const std::string& ofNode); 54 55 /** @brief Find hwmon instances from a device path 56 * 57 * Look for a matching hwmon instance given a device path that 58 * starts with /devices. This path is the DEVPATH udev attribute 59 * for the device except it has the '/hwmon/hwmonN' stripped off. 60 * 61 * @param[in] devPath - The device path. 62 * 63 * @return - The hwmon instance path or an empty 64 * string if no match is found. 65 */ 66 std::string findHwmonFromDevPath(const std::string& devPath); 67 68 /** @brief Return the path to use for a call out. 69 * 70 * Return an empty string if a callout path cannot be 71 * found. 72 * 73 * @param[in] instancePath - /sys/class/hwmon/hwmon<N> path. 74 * 75 * @return Path to use for call out 76 */ 77 std::string findCalloutPath(const std::string& instancePath); 78 79 } // namespace sysfs 80 81 // vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4 82