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