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     _failed = _helper->ThresholdsAsserted(tempBus, service, path);
62 }
63 
64 ReadReturn DbusPassive::read(void)
65 {
66     std::lock_guard<std::mutex> guard(_lock);
67 
68     struct ReadReturn r = {_value, _updated};
69 
70     return r;
71 }
72 
73 void DbusPassive::setValue(double value)
74 {
75     std::lock_guard<std::mutex> guard(_lock);
76 
77     _value = value;
78     _updated = std::chrono::high_resolution_clock::now();
79 }
80 
81 bool DbusPassive::getFailed(void) const
82 {
83     return _failed;
84 }
85 
86 void DbusPassive::setFailed(bool value)
87 {
88     _failed = value;
89 }
90 
91 int64_t DbusPassive::getScale(void)
92 {
93     return _scale;
94 }
95 
96 std::string DbusPassive::getId(void)
97 {
98     return _id;
99 }
100 
101 int HandleSensorValue(sdbusplus::message::message& msg, DbusPassive* owner)
102 {
103     std::string msgSensor;
104     std::map<std::string, sdbusplus::message::variant<int64_t, double, bool>>
105         msgData;
106 
107     msg.read(msgSensor, msgData);
108 
109     if (msgSensor == "xyz.openbmc_project.Sensor.Value")
110     {
111         auto valPropMap = msgData.find("Value");
112         if (valPropMap != msgData.end())
113         {
114             double value = sdbusplus::message::variant_ns::apply_visitor(
115                 VariantToDoubleVisitor(), valPropMap->second);
116 
117             value *= std::pow(10, owner->getScale());
118 
119             owner->setValue(value);
120         }
121     }
122     else if (msgSensor == "xyz.openbmc_project.Sensor.Threshold.Critical")
123     {
124         auto criticalAlarmLow = msgData.find("CriticalAlarmLow");
125         auto criticalAlarmHigh = msgData.find("CriticalAlarmHigh");
126         if (criticalAlarmHigh == msgData.end() &&
127             criticalAlarmLow == msgData.end())
128         {
129             return 0;
130         }
131 
132         bool asserted = false;
133         if (criticalAlarmLow != msgData.end())
134         {
135             asserted = sdbusplus::message::variant_ns::get<bool>(
136                 criticalAlarmLow->second);
137         }
138 
139         // checking both as in theory you could de-assert one threshold and
140         // assert the other at the same moment
141         if (!asserted && criticalAlarmHigh != msgData.end())
142         {
143             asserted = sdbusplus::message::variant_ns::get<bool>(
144                 criticalAlarmHigh->second);
145         }
146         owner->setFailed(asserted);
147     }
148 
149     return 0;
150 }
151 
152 int DbusHandleSignal(sd_bus_message* msg, void* usrData, sd_bus_error* err)
153 {
154     auto sdbpMsg = sdbusplus::message::message(msg);
155     DbusPassive* obj = static_cast<DbusPassive*>(usrData);
156 
157     return HandleSensorValue(sdbpMsg, obj);
158 }
159