xref: /openbmc/phosphor-power/utility.cpp (revision 4c94bc7c840d2bfda6ac7acec811f80fdf3f3b7a)
1  /**
2   * Copyright © 2017 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 "utility.hpp"
17  
18  #include "types.hpp"
19  
20  #include <fstream>
21  
22  namespace phosphor
23  {
24  namespace power
25  {
26  namespace util
27  {
28  
29  constexpr auto MAPPER_BUSNAME = "xyz.openbmc_project.ObjectMapper";
30  constexpr auto MAPPER_PATH = "/xyz/openbmc_project/object_mapper";
31  constexpr auto MAPPER_INTERFACE = "xyz.openbmc_project.ObjectMapper";
32  
33  using namespace phosphor::logging;
34  using json = nlohmann::json;
35  
36  std::string getService(const std::string& path, const std::string& interface,
37                         sdbusplus::bus::bus& bus)
38  {
39      auto method = bus.new_method_call(MAPPER_BUSNAME, MAPPER_PATH,
40                                        MAPPER_INTERFACE, "GetObject");
41  
42      method.append(path);
43      method.append(std::vector<std::string>({interface}));
44  
45      auto reply = bus.call(method);
46  
47      std::map<std::string, std::vector<std::string>> response;
48      reply.read(response);
49  
50      if (response.empty())
51      {
52          log<level::ERR>("Error in mapper response for getting service name",
53                          entry("PATH=%s", path.c_str()),
54                          entry("INTERFACE=%s", interface.c_str()));
55          return std::string{};
56      }
57  
58      return response.begin()->first;
59  }
60  
61  json loadJSONFromFile(const char* path)
62  {
63      std::ifstream ifs(path);
64      if (!ifs.good())
65      {
66          log<level::ERR>("Unable to open file", entry("PATH=%s", path));
67          return nullptr;
68      }
69      auto data = json::parse(ifs, nullptr, false);
70      if (data.is_discarded())
71      {
72          log<level::ERR>("Failed to parse json", entry("PATH=%s", path));
73          return nullptr;
74      }
75      return data;
76  }
77  
78  phosphor::pmbus::Type getPMBusAccessType(const json& json)
79  {
80      using namespace phosphor::pmbus;
81      Type type;
82  
83      auto typeStr = json.at("inventoryPMBusAccessType");
84  
85      if (typeStr == "Hwmon")
86      {
87          type = Type::Hwmon;
88      }
89      else if (typeStr == "DeviceDebug")
90      {
91          type = Type::DeviceDebug;
92      }
93      else if (typeStr == "Debug")
94      {
95          type = Type::Debug;
96      }
97      else if (typeStr == "HwmonDeviceDebug")
98      {
99          type = Type::HwmonDeviceDebug;
100      }
101      else
102      {
103          type = Type::Base;
104      }
105      return type;
106  }
107  
108  bool isPoweredOn(sdbusplus::bus::bus& bus, bool defaultState)
109  {
110      int32_t state = defaultState;
111  
112      try
113      {
114          // When state = 1, system is powered on
115          auto service = util::getService(POWER_OBJ_PATH, POWER_IFACE, bus);
116          getProperty<int32_t>(POWER_IFACE, "state", POWER_OBJ_PATH, service, bus,
117                               state);
118      }
119      catch (std::exception& e)
120      {
121          log<level::INFO>("Failed to get power state.");
122      }
123      return state != 0;
124  }
125  
126  std::vector<std::string> getPSUInventoryPaths(sdbusplus::bus::bus& bus)
127  {
128      std::vector<std::string> paths;
129      auto method = bus.new_method_call(MAPPER_BUSNAME, MAPPER_PATH,
130                                        MAPPER_INTERFACE, "GetSubTreePaths");
131      method.append(INVENTORY_OBJ_PATH);
132      method.append(0); // Depth 0 to search all
133      method.append(std::vector<std::string>({PSU_INVENTORY_IFACE}));
134      auto reply = bus.call(method);
135  
136      reply.read(paths);
137      return paths;
138  }
139  
140  } // namespace util
141  } // namespace power
142  } // namespace phosphor
143