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/lg2.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::power::util; 36 37 namespace model 38 { 39 40 namespace internal 41 { 42 43 /** 44 * @brief Get the PSU model from sysfs. 45 * 46 * Obtain PSU information from the PSU JSON file. 47 * 48 * Throws an exception if an error occurs. 49 * 50 * @param[in] psuInventoryPath - PSU D-Bus inventory path 51 * 52 * @return PSU model 53 */ 54 std::string getModelJson(const std::string& psuInventoryPath) 55 { 56 // Parse PSU JSON file 57 std::ifstream file{PSU_JSON_PATH}; 58 json data = json::parse(file); 59 60 // Get PSU device path from JSON 61 auto it = data.find("psuDevices"); 62 if (it == data.end()) 63 { 64 throw std::runtime_error{"Unable to find psuDevices"}; 65 } 66 auto device = it->find(psuInventoryPath); 67 if (device == it->end()) 68 { 69 throw std::runtime_error{std::format( 70 "Unable to find device path for PSU {}", psuInventoryPath)}; 71 } 72 std::string devicePath = *device; 73 if (devicePath.empty()) 74 { 75 throw std::runtime_error{ 76 std::format("Empty device path for PSU {}", psuInventoryPath)}; 77 } 78 79 // Get sysfs filename from JSON for Model information 80 it = data.find("fruConfigs"); 81 if (it == data.end()) 82 { 83 throw std::runtime_error{"Unable to find fruConfigs"}; 84 } 85 std::string fileName; 86 for (const auto& fru : *it) 87 { 88 if (fru.contains("propertyName") && (fru["propertyName"] == "Model") && 89 fru.contains("fileName")) 90 { 91 fileName = fru["fileName"]; 92 break; 93 } 94 } 95 if (fileName.empty()) 96 { 97 throw std::runtime_error{"Unable to find file name for Model"}; 98 } 99 100 // Get PMBus access type from JSON 101 phosphor::pmbus::Type type = getPMBusAccessType(data); 102 103 // Read model from sysfs file 104 phosphor::pmbus::PMBus pmbus(devicePath); 105 std::string model = pmbus.readString(fileName, type); 106 return model; 107 } 108 109 /** 110 * @brief Get the PSU model from sysfs. 111 * 112 * Obtain PSU information from D-Bus. 113 * 114 * Throws an exception if an error occurs. 115 * 116 * @param[in] bus - D-Bus connection 117 * @param[in] psuInventoryPath - PSU D-Bus inventory path 118 * 119 * @return PSU model 120 */ 121 std::string getModelDbus(sdbusplus::bus_t& bus, 122 const std::string& psuInventoryPath) 123 { 124 // Get PSU I2C bus/address and create PMBus interface 125 const auto [i2cBus, i2cAddr] = getPsuI2c(bus, psuInventoryPath); 126 auto pmbus = getPmbusIntf(i2cBus, i2cAddr); 127 128 // Read model from sysfs file 129 std::string fileName = "ccin"; 130 auto type = phosphor::pmbus::Type::HwmonDeviceDebug; 131 std::string model = pmbus->readString(fileName, type); 132 return model; 133 } 134 135 } // namespace internal 136 137 std::string getModel(sdbusplus::bus_t& bus, const std::string& psuInventoryPath) 138 { 139 std::string model; 140 try 141 { 142 if (usePsuJsonFile()) 143 { 144 // Obtain PSU information from JSON file 145 model = internal::getModelJson(psuInventoryPath); 146 } 147 else 148 { 149 // Obtain PSU information from D-Bus 150 model = internal::getModelDbus(bus, psuInventoryPath); 151 } 152 } 153 catch (const std::exception& e) 154 { 155 lg2::error("Error in getModel: {ERROR}", "ERROR", e); 156 } 157 return model; 158 } 159 160 } // namespace model 161