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