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