1 /** 2 * Copyright © 2024 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 "config.h" 17 18 #include "model.hpp" 19 20 #include "pmbus.hpp" 21 #include "utility.hpp" 22 #include "utils.hpp" 23 24 #include <nlohmann/json.hpp> 25 #include <phosphor-logging/log.hpp> 26 27 #include <exception> 28 #include <format> 29 #include <fstream> 30 #include <stdexcept> 31 32 using json = nlohmann::json; 33 34 using namespace utils; 35 using namespace phosphor::logging; 36 using namespace phosphor::power::util; 37 38 namespace model 39 { 40 41 namespace internal 42 { 43 44 /** 45 * @brief Get the PSU model from sysfs. 46 * 47 * Obtain PSU information from the PSU JSON file. 48 * 49 * Throws an exception if an error occurs. 50 * 51 * @param[in] psuInventoryPath - PSU D-Bus inventory path 52 * 53 * @return PSU model 54 */ 55 std::string getModelJson(const std::string& psuInventoryPath) 56 { 57 // Parse PSU JSON file 58 std::ifstream file{PSU_JSON_PATH}; 59 json data = json::parse(file); 60 61 // Get PSU device path from JSON 62 auto it = data.find("psuDevices"); 63 if (it == data.end()) 64 { 65 throw std::runtime_error{"Unable to find psuDevices"}; 66 } 67 auto device = it->find(psuInventoryPath); 68 if (device == it->end()) 69 { 70 throw std::runtime_error{std::format( 71 "Unable to find device path for PSU {}", psuInventoryPath)}; 72 } 73 std::string devicePath = *device; 74 if (devicePath.empty()) 75 { 76 throw std::runtime_error{ 77 std::format("Empty device path for PSU {}", psuInventoryPath)}; 78 } 79 80 // Get sysfs filename from JSON for Model information 81 it = data.find("fruConfigs"); 82 if (it == data.end()) 83 { 84 throw std::runtime_error{"Unable to find fruConfigs"}; 85 } 86 std::string fileName; 87 for (const auto& fru : *it) 88 { 89 if (fru.contains("propertyName") && (fru["propertyName"] == "Model") && 90 fru.contains("fileName")) 91 { 92 fileName = fru["fileName"]; 93 break; 94 } 95 } 96 if (fileName.empty()) 97 { 98 throw std::runtime_error{"Unable to find file name for Model"}; 99 } 100 101 // Get PMBus access type from JSON 102 phosphor::pmbus::Type type = getPMBusAccessType(data); 103 104 // Read model from sysfs file 105 phosphor::pmbus::PMBus pmbus(devicePath); 106 std::string model = pmbus.readString(fileName, type); 107 return model; 108 } 109 110 /** 111 * @brief Get the PSU model from sysfs. 112 * 113 * Obtain PSU information from D-Bus. 114 * 115 * Throws an exception if an error occurs. 116 * 117 * @param[in] bus - D-Bus connection 118 * @param[in] psuInventoryPath - PSU D-Bus inventory path 119 * 120 * @return PSU model 121 */ 122 std::string getModelDbus(sdbusplus::bus_t& bus, 123 const std::string& psuInventoryPath) 124 { 125 // Get PSU I2C bus/address and create PMBus interface 126 const auto [i2cBus, i2cAddr] = getPsuI2c(bus, psuInventoryPath); 127 auto pmbus = getPmbusIntf(i2cBus, i2cAddr); 128 129 // Read model from sysfs file 130 std::string fileName = "ccin"; 131 auto type = phosphor::pmbus::Type::HwmonDeviceDebug; 132 std::string model = pmbus->readString(fileName, type); 133 return model; 134 } 135 136 } // namespace internal 137 138 std::string getModel(sdbusplus::bus_t& bus, const std::string& psuInventoryPath) 139 { 140 std::string model; 141 try 142 { 143 if (usePsuJsonFile()) 144 { 145 // Obtain PSU information from JSON file 146 model = internal::getModelJson(psuInventoryPath); 147 } 148 else 149 { 150 // Obtain PSU information from D-Bus 151 model = internal::getModelDbus(bus, psuInventoryPath); 152 } 153 } 154 catch (const std::exception& e) 155 { 156 log<level::ERR>(std::format("Error: {}", e.what()).c_str()); 157 } 158 return model; 159 } 160 161 } // namespace model 162