1 /*
2 // Copyright (c) 2018 Intel 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 
17 #include "dbus/dbuswrite.hpp"
18 
19 #include <phosphor-logging/log.hpp>
20 #include <sdbusplus/bus.hpp>
21 
22 #include <iostream>
23 #include <memory>
24 #include <string>
25 #include <variant>
26 
27 constexpr const char* pwmInterface = "xyz.openbmc_project.Control.FanPwm";
28 
29 using namespace phosphor::logging;
30 
31 std::unique_ptr<WriteInterface>
32     DbusWritePercent::createDbusWrite(const std::string& path, int64_t min,
33                                       int64_t max, DbusHelperInterface& helper)
34 {
35     auto tempBus = sdbusplus::bus::new_system();
36     std::string connectionName;
37 
38     try
39     {
40         connectionName = helper.getService(tempBus, pwmInterface, path);
41     }
42     catch (const std::exception& e)
43     {
44         return nullptr;
45     }
46 
47     return std::make_unique<DbusWritePercent>(path, min, max, connectionName);
48 }
49 
50 void DbusWritePercent::write(double value)
51 {
52     double minimum = getMin();
53     double maximum = getMax();
54 
55     double range = maximum - minimum;
56     double offset = range * value;
57     double ovalue = offset + minimum;
58 
59     if (oldValue == static_cast<int64_t>(ovalue))
60     {
61         return;
62     }
63     auto writeBus = sdbusplus::bus::new_default();
64     auto mesg =
65         writeBus.new_method_call(connectionName.c_str(), path.c_str(),
66                                  "org.freedesktop.DBus.Properties", "Set");
67     mesg.append(pwmInterface, "Target",
68                 std::variant<uint64_t>(static_cast<uint64_t>(ovalue)));
69 
70     try
71     {
72         // TODO: if we don't use the reply, call_noreply()
73         auto resp = writeBus.call(mesg);
74     }
75     catch (const sdbusplus::exception::SdBusError& ex)
76     {
77         log<level::ERR>("Dbus Call Failure", entry("PATH=%s", path.c_str()),
78                         entry("WHAT=%s", ex.what()));
79     }
80 
81     oldValue = static_cast<int64_t>(ovalue);
82     return;
83 }
84 
85 std::unique_ptr<WriteInterface>
86     DbusWrite::createDbusWrite(const std::string& path, int64_t min,
87                                int64_t max, DbusHelperInterface& helper)
88 {
89     auto tempBus = sdbusplus::bus::new_system();
90     std::string connectionName;
91 
92     try
93     {
94         connectionName = helper.getService(tempBus, pwmInterface, path);
95     }
96     catch (const std::exception& e)
97     {
98         return nullptr;
99     }
100 
101     return std::make_unique<DbusWrite>(path, min, max, connectionName);
102 }
103 
104 void DbusWrite::write(double value)
105 {
106     if (oldValue == static_cast<int64_t>(value))
107     {
108         return;
109     }
110     auto writeBus = sdbusplus::bus::new_default();
111     auto mesg =
112         writeBus.new_method_call(connectionName.c_str(), path.c_str(),
113                                  "org.freedesktop.DBus.Properties", "Set");
114     mesg.append(pwmInterface, "Target",
115                 std::variant<uint64_t>(static_cast<uint64_t>(value)));
116 
117     try
118     {
119         // TODO: consider call_noreplly
120         auto resp = writeBus.call(mesg);
121     }
122     catch (const sdbusplus::exception::SdBusError& ex)
123     {
124         log<level::ERR>("Dbus Call Failure", entry("PATH=%s", path.c_str()),
125                         entry("WHAT=%s", ex.what()));
126     }
127 
128     oldValue = static_cast<int64_t>(value);
129     return;
130 }
131