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