1 /**
2  * Copyright 2017 Google Inc.
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 "dbuspassive.hpp"
17 
18 #include "dbus/util.hpp"
19 
20 #include <chrono>
21 #include <cmath>
22 #include <memory>
23 #include <mutex>
24 #include <sdbusplus/bus.hpp>
25 #include <string>
26 
27 std::unique_ptr<ReadInterface> DbusPassive::CreateDbusPassive(
28     sdbusplus::bus::bus& bus, const std::string& type, const std::string& id,
29     DbusHelperInterface* helper)
30 {
31     if (helper == nullptr)
32     {
33         return nullptr;
34     }
35     if (!ValidType(type))
36     {
37         return nullptr;
38     }
39 
40     return std::make_unique<DbusPassive>(bus, type, id, helper);
41 }
42 
43 DbusPassive::DbusPassive(sdbusplus::bus::bus& bus, const std::string& type,
44                          const std::string& id, DbusHelperInterface* helper) :
45     ReadInterface(),
46     _bus(bus), _signal(bus, GetMatch(type, id).c_str(), DbusHandleSignal, this),
47     _id(id), _helper(helper)
48 {
49     /* Need to get the scale and initial value */
50     auto tempBus = sdbusplus::bus::new_default();
51     /* service == busname */
52     std::string path = GetSensorPath(type, id);
53     std::string service = _helper->GetService(tempBus, sensorintf, path);
54 
55     struct SensorProperties settings;
56     _helper->GetProperties(tempBus, service, path, &settings);
57 
58     _scale = settings.scale;
59     _value = settings.value * pow(10, _scale);
60     _updated = std::chrono::high_resolution_clock::now();
61 }
62 
63 ReadReturn DbusPassive::read(void)
64 {
65     std::lock_guard<std::mutex> guard(_lock);
66 
67     struct ReadReturn r = {_value, _updated};
68 
69     return r;
70 }
71 
72 void DbusPassive::setValue(double value)
73 {
74     std::lock_guard<std::mutex> guard(_lock);
75 
76     _value = value;
77     _updated = std::chrono::high_resolution_clock::now();
78 }
79 
80 int64_t DbusPassive::getScale(void)
81 {
82     return _scale;
83 }
84 
85 std::string DbusPassive::getId(void)
86 {
87     return _id;
88 }
89 
90 int HandleSensorValue(sdbusplus::message::message& msg, DbusPassive* owner)
91 {
92     std::string msgSensor;
93     std::map<std::string, sdbusplus::message::variant<int64_t, double>> msgData;
94 
95     msg.read(msgSensor, msgData);
96 
97     if (msgSensor == "xyz.openbmc_project.Sensor.Value")
98     {
99         auto valPropMap = msgData.find("Value");
100         if (valPropMap != msgData.end())
101         {
102             double value = sdbusplus::message::variant_ns::apply_visitor(
103                 VariantToDoubleVisitor(), valPropMap->second);
104 
105             value *= std::pow(10, owner->getScale());
106 
107             owner->setValue(value);
108         }
109     }
110 
111     return 0;
112 }
113 
114 int DbusHandleSignal(sd_bus_message* msg, void* usrData, sd_bus_error* err)
115 {
116     auto sdbpMsg = sdbusplus::message::message(msg);
117     DbusPassive* obj = static_cast<DbusPassive*>(usrData);
118 
119     return HandleSensorValue(sdbpMsg, obj);
120 }
121