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 
17 #include "host.hpp"
18 
19 #include <cmath>
20 #include <iostream>
21 #include <memory>
22 #include <mutex>
23 
24 namespace pid_control
25 {
26 
27 template <typename T>
28 void scaleHelper(T& ptr, int64_t value)
29 {
30     if constexpr (std::is_same_v<ValueType, int64_t>)
31     {
32         ptr->scale(value);
33     }
34 }
35 
36 std::unique_ptr<Sensor> HostSensor::createTemp(const std::string& name,
37                                                int64_t timeout,
38                                                sdbusplus::bus::bus& bus,
39                                                const char* objPath, bool defer)
40 {
41     auto sensor =
42         std::make_unique<HostSensor>(name, timeout, bus, objPath, defer);
43     sensor->value(0);
44 
45     // DegreesC and value of 0 are the defaults at present, therefore testing
46     // this code only sees scale get updated as a property.
47 
48     // TODO(venture): Need to not hard-code that this is DegreesC and scale
49     // 10x-3 unless it is! :D
50     sensor->unit(ValueInterface::Unit::DegreesC);
51     scaleHelper(sensor, -3);
52     sensor->emit_object_added();
53     // emit_object_added() can be called twice, harmlessly, the second time it
54     // doesn't actually happen, but we don't want to call it before we set up
55     // the initial values, so we should not let someone call this with
56     // defer=false.
57 
58     /* TODO(venture): Need to set that _updated is set to epoch or something
59      * else.  what is the default value?
60      */
61     return sensor;
62 }
63 
64 template <typename T>
65 int64_t getScale(T* sensor)
66 {
67     if constexpr (std::is_same_v<ValueType, int64_t>)
68     {
69         return sensor->scale();
70     }
71     return 0;
72 }
73 
74 ValueType HostSensor::value(ValueType value)
75 {
76     std::lock_guard<std::mutex> guard(_lock);
77 
78     _updated = std::chrono::high_resolution_clock::now();
79     _value = value * pow(10, getScale(this)); /* scale value */
80 
81     return ValueObject::value(value);
82 }
83 
84 ReadReturn HostSensor::read(void)
85 {
86     std::lock_guard<std::mutex> guard(_lock);
87 
88     /* This doesn't sanity check anything, that's the caller's job. */
89     ReadReturn r = {_value, _updated};
90 
91     return r;
92 }
93 
94 void HostSensor::write(double value)
95 {
96     throw std::runtime_error("Not Implemented.");
97 }
98 
99 bool HostSensor::getFailed(void)
100 {
101     if (std::isfinite(_value))
102     {
103         return false;
104     }
105 
106     return true;
107 }
108 
109 } // namespace pid_control
110