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