1 /**
2  * Copyright © 2017 IBM Corporation
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 #include "fan.hpp"
17 
18 #include "sdbusplus.hpp"
19 
20 #include <string>
21 
22 namespace phosphor
23 {
24 namespace fan
25 {
26 namespace control
27 {
28 
29 // For throwing exception
30 using namespace phosphor::logging;
31 
32 constexpr auto FAN_SENSOR_PATH = "/xyz/openbmc_project/sensors/fan_tach/";
33 constexpr auto FAN_TARGET_PROPERTY = "Target";
34 
35 Fan::Fan(sdbusplus::bus_t& bus, const FanDefinition& def) :
36     _bus(bus), _name(std::get<fanNamePos>(def)),
37     _interface(std::get<targetInterfacePos>(def))
38 {
39     std::string path;
40     auto sensors = std::get<sensorListPos>(def);
41     for (auto& s : sensors)
42     {
43         path = FAN_SENSOR_PATH + s;
44         auto service = util::SDBusPlus::getService(bus, path, _interface);
45         _sensors[path] = service;
46     }
47     // All sensors associated with this fan are set to the same target speed,
48     // so only need to read target property from one.
49     if (!path.empty())
50     {
51         // Use getProperty with service lookup since each target sensor
52         // path given could have different services providing them
53         _targetSpeed = util::SDBusPlus::getProperty<uint64_t>(
54             bus, path, _interface, FAN_TARGET_PROPERTY);
55     }
56 }
57 
58 void Fan::setSpeed(uint64_t speed)
59 {
60     for (auto& sensor : _sensors)
61     {
62         auto value = speed;
63         try
64         {
65             util::SDBusPlus::setProperty<uint64_t>(
66                 _bus, sensor.second, sensor.first, _interface,
67                 FAN_TARGET_PROPERTY, std::move(value));
68         }
69         catch (const sdbusplus::exception_t&)
70         {
71             throw util::DBusPropertyError{"DBus set property failed",
72                                           sensor.second, sensor.first,
73                                           _interface, FAN_TARGET_PROPERTY};
74         }
75     }
76 
77     _targetSpeed = speed;
78 }
79 
80 } // namespace control
81 } // namespace fan
82 } // namespace phosphor
83