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 
17 #include "device_finder.hpp"
18 
19 #include <phosphor-logging/lg2.hpp>
20 
21 #include <exception>
22 #include <format>
23 #include <stdexcept>
24 #include <utility>
25 #include <variant>
26 #include <vector>
27 
28 namespace phosphor::power::sequencer
29 {
30 
31 const std::string deviceInterfacesService = "xyz.openbmc_project.EntityManager";
32 
33 const std::vector<std::string> deviceInterfaces{
34     "xyz.openbmc_project.Configuration.UCD90160",
35     "xyz.openbmc_project.Configuration.UCD90320"};
36 
37 const std::string typeProperty = "Type";
38 const std::string nameProperty = "Name";
39 const std::string busProperty = "Bus";
40 const std::string addressProperty = "Address";
41 
DeviceFinder(sdbusplus::bus_t & bus,Callback callback)42 DeviceFinder::DeviceFinder(sdbusplus::bus_t& bus, Callback callback) :
43     callback{std::move(callback)}
44 {
45     interfacesFinder = std::make_unique<DBusInterfacesFinder>(
46         bus, deviceInterfacesService, deviceInterfaces,
47         std::bind_front(&DeviceFinder::interfaceFoundCallback, this));
48 }
49 
interfaceFoundCallback(const std::string & path,const std::string & interface,const DbusPropertyMap & properties)50 void DeviceFinder::interfaceFoundCallback(
51     [[maybe_unused]] const std::string& path, const std::string& interface,
52     const DbusPropertyMap& properties)
53 {
54     try
55     {
56         DeviceProperties device{};
57 
58         auto value = getPropertyValue(properties, typeProperty);
59         device.type = std::get<std::string>(value);
60 
61         value = getPropertyValue(properties, nameProperty);
62         device.name = std::get<std::string>(value);
63 
64         value = getPropertyValue(properties, busProperty);
65         device.bus = static_cast<uint8_t>(std::get<uint64_t>(value));
66 
67         value = getPropertyValue(properties, addressProperty);
68         device.address = static_cast<uint16_t>(std::get<uint64_t>(value));
69 
70         callback(device);
71     }
72     catch (const std::exception& e)
73     {
74         lg2::error(
75             "Unable to obtain properties of interface {INTERFACE}: {ERROR}",
76             "INTERFACE", interface, "ERROR", e);
77     }
78 }
79 
getPropertyValue(const DbusPropertyMap & properties,const std::string & propertyName)80 const DbusVariant& DeviceFinder::getPropertyValue(
81     const DbusPropertyMap& properties, const std::string& propertyName)
82 {
83     auto it = properties.find(propertyName);
84     if (it == properties.end())
85     {
86         throw std::runtime_error{
87             std::format("{} property not found", propertyName)};
88     }
89     return it->second;
90 }
91 
92 } // namespace phosphor::power::sequencer
93