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 <iostream>
18 #include <map>
19 #include <string>
20 
21 /* Configuration. */
22 #include "conf.hpp"
23 #include "dbus/dbuspassive.hpp"
24 #include "dbus/dbuswrite.hpp"
25 #include "interfaces.hpp"
26 #include "notimpl/readonly.hpp"
27 #include "notimpl/writeonly.hpp"
28 #include "sensors/builder.hpp"
29 #include "sensors/host.hpp"
30 #include "sensors/manager.hpp"
31 #include "sensors/pluggable.hpp"
32 #include "sysfs/sysfsread.hpp"
33 #include "sysfs/sysfswrite.hpp"
34 #include "util.hpp"
35 
36 static constexpr bool deferSignals = true;
37 static DbusHelper helper;
38 
39 SensorManager
40     buildSensors(const std::map<std::string, struct SensorConfig>& config)
41 {
42     SensorManager mgmr;
43     auto& HostSensorBus = mgmr.getHostBus();
44     auto& PassiveListeningBus = mgmr.getPassiveBus();
45 
46     for (const auto& it : config)
47     {
48         std::unique_ptr<ReadInterface> ri;
49         std::unique_ptr<WriteInterface> wi;
50 
51         std::string name = it.first;
52         const struct SensorConfig* info = &it.second;
53 
54         std::cerr << "Sensor: " << name << " " << info->type << " ";
55         std::cerr << info->readpath << " " << info->writepath << "\n";
56 
57         IOInterfaceType rtype = getReadInterfaceType(info->readpath);
58         IOInterfaceType wtype = getWriteInterfaceType(info->writepath);
59 
60         // fan sensors can be ready any way and written others.
61         // fan sensors are the only sensors this is designed to write.
62         // Nothing here should be write-only, although, in theory a fan could
63         // be. I'm just not sure how that would fit together.
64         // TODO(venture): It should check with the ObjectMapper to check if
65         // that sensor exists on the Dbus.
66         switch (rtype)
67         {
68             case IOInterfaceType::DBUSPASSIVE:
69                 ri = DbusPassive::createDbusPassive(PassiveListeningBus,
70                                                     info->type, name, &helper);
71                 /* TODO(venture): if this returns nullptr */
72                 break;
73             case IOInterfaceType::EXTERNAL:
74                 // These are a special case for read-only.
75                 break;
76             case IOInterfaceType::SYSFS:
77                 ri = std::make_unique<SysFsRead>(info->readpath);
78                 break;
79             default:
80                 ri = std::make_unique<WriteOnly>();
81                 break;
82         }
83 
84         if (info->type == "fan")
85         {
86             switch (wtype)
87             {
88                 case IOInterfaceType::SYSFS:
89                     if (info->max > 0)
90                     {
91                         wi = std::make_unique<SysFsWritePercent>(
92                             info->writepath, info->min, info->max);
93                     }
94                     else
95                     {
96                         wi = std::make_unique<SysFsWrite>(info->writepath,
97                                                           info->min, info->max);
98                     }
99 
100                     break;
101                 case IOInterfaceType::DBUSACTIVE:
102                     if (info->max > 0)
103                     {
104                         wi = std::make_unique<DbusWritePercent>(
105                             info->writepath, info->min, info->max, helper);
106                     }
107                     else
108                     {
109                         wi = std::make_unique<DbusWrite>(
110                             info->writepath, info->min, info->max, helper);
111                     }
112 
113                     break;
114                 default:
115                     wi = std::make_unique<ReadOnlyNoExcept>();
116                     break;
117             }
118 
119             auto sensor = std::make_unique<PluggableSensor>(
120                 name, info->timeout, std::move(ri), std::move(wi));
121             mgmr.addSensor(info->type, name, std::move(sensor));
122         }
123         else if (info->type == "temp" || info->type == "margin")
124         {
125             // These sensors are read-only, but only for this application
126             // which only writes to fan sensors.
127             std::cerr << info->type << " readpath: " << info->readpath << "\n";
128 
129             if (IOInterfaceType::EXTERNAL == rtype)
130             {
131                 std::cerr << "Creating HostSensor: " << name
132                           << " path: " << info->readpath << "\n";
133 
134                 /*
135                  * The reason we handle this as a HostSensor is because it's
136                  * not quite pluggable; but maybe it could be.
137                  */
138                 auto sensor = HostSensor::createTemp(
139                     name, info->timeout, HostSensorBus, info->readpath.c_str(),
140                     deferSignals);
141                 mgmr.addSensor(info->type, name, std::move(sensor));
142             }
143             else
144             {
145                 wi = std::make_unique<ReadOnlyNoExcept>();
146                 auto sensor = std::make_unique<PluggableSensor>(
147                     name, info->timeout, std::move(ri), std::move(wi));
148                 mgmr.addSensor(info->type, name, std::move(sensor));
149             }
150         }
151     }
152 
153     return mgmr;
154 }
155