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 "errors/exception.hpp"
26 #include "interfaces.hpp"
27 #include "notimpl/readonly.hpp"
28 #include "notimpl/writeonly.hpp"
29 #include "sensors/builder.hpp"
30 #include "sensors/host.hpp"
31 #include "sensors/manager.hpp"
32 #include "sensors/pluggable.hpp"
33 #include "sysfs/sysfsread.hpp"
34 #include "sysfs/sysfswrite.hpp"
35 #include "util.hpp"
36 
37 static constexpr bool deferSignals = true;
38 static DbusHelper helper;
39 
40 SensorManager
41     buildSensors(const std::map<std::string, struct SensorConfig>& config)
42 {
43     SensorManager mgmr;
44     auto& HostSensorBus = mgmr.getHostBus();
45     auto& PassiveListeningBus = mgmr.getPassiveBus();
46 
47     for (const auto& it : config)
48     {
49         std::unique_ptr<ReadInterface> ri;
50         std::unique_ptr<WriteInterface> wi;
51 
52         std::string name = it.first;
53         const struct SensorConfig* info = &it.second;
54 
55         std::cerr << "Sensor: " << name << " " << info->type << " ";
56         std::cerr << info->readpath << " " << info->writepath << "\n";
57 
58         IOInterfaceType rtype = getReadInterfaceType(info->readpath);
59         IOInterfaceType wtype = getWriteInterfaceType(info->writepath);
60 
61         // fan sensors can be ready any way and written others.
62         // fan sensors are the only sensors this is designed to write.
63         // Nothing here should be write-only, although, in theory a fan could
64         // be. I'm just not sure how that would fit together.
65         // TODO(venture): It should check with the ObjectMapper to check if
66         // that sensor exists on the Dbus.
67         switch (rtype)
68         {
69             case IOInterfaceType::DBUSPASSIVE:
70                 ri = DbusPassive::createDbusPassive(PassiveListeningBus,
71                                                     info->type, name, &helper);
72                 /* TODO(venture): if this returns nullptr */
73                 break;
74             case IOInterfaceType::EXTERNAL:
75                 // These are a special case for read-only.
76                 break;
77             case IOInterfaceType::SYSFS:
78                 ri = std::make_unique<SysFsRead>(info->readpath);
79                 break;
80             default:
81                 ri = std::make_unique<WriteOnly>();
82                 break;
83         }
84 
85         if (info->type == "fan")
86         {
87             switch (wtype)
88             {
89                 case IOInterfaceType::SYSFS:
90                     if (info->max > 0)
91                     {
92                         wi = std::make_unique<SysFsWritePercent>(
93                             info->writepath, info->min, info->max);
94                     }
95                     else
96                     {
97                         wi = std::make_unique<SysFsWrite>(info->writepath,
98                                                           info->min, info->max);
99                     }
100 
101                     break;
102                 case IOInterfaceType::DBUSACTIVE:
103                     if (info->max > 0)
104                     {
105                         wi = DbusWritePercent::createDbusWrite(
106                             info->writepath, info->min, info->max, helper);
107                         /* TODO: handle this being nullptr. */
108                     }
109                     else
110                     {
111                         wi = DbusWrite::createDbusWrite(
112                             info->writepath, info->min, info->max, helper);
113                         /* TODO: handle this being nullptr. */
114                     }
115 
116                     break;
117                 default:
118                     wi = std::make_unique<ReadOnlyNoExcept>();
119                     break;
120             }
121 
122             auto sensor = std::make_unique<PluggableSensor>(
123                 name, info->timeout, std::move(ri), std::move(wi));
124             mgmr.addSensor(info->type, name, std::move(sensor));
125         }
126         else if (info->type == "temp" || info->type == "margin")
127         {
128             // These sensors are read-only, but only for this application
129             // which only writes to fan sensors.
130             std::cerr << info->type << " readpath: " << info->readpath << "\n";
131 
132             if (IOInterfaceType::EXTERNAL == rtype)
133             {
134                 std::cerr << "Creating HostSensor: " << name
135                           << " path: " << info->readpath << "\n";
136 
137                 /*
138                  * The reason we handle this as a HostSensor is because it's
139                  * not quite pluggable; but maybe it could be.
140                  */
141                 auto sensor = HostSensor::createTemp(
142                     name, info->timeout, HostSensorBus, info->readpath.c_str(),
143                     deferSignals);
144                 mgmr.addSensor(info->type, name, std::move(sensor));
145             }
146             else
147             {
148                 wi = std::make_unique<ReadOnlyNoExcept>();
149                 auto sensor = std::make_unique<PluggableSensor>(
150                     name, info->timeout, std::move(ri), std::move(wi));
151                 mgmr.addSensor(info->type, name, std::move(sensor));
152             }
153         }
154     }
155 
156     return mgmr;
157 }
158