1 /**
2 * Copyright © 2016 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
17 #include "monitor.hpp"
18
19 #include <systemd/sd-event.h>
20
21 #include <CLI/CLI.hpp>
22 #include <phosphor-logging/lg2.hpp>
23
24 #include <iostream>
25 #include <string>
26
main(int argc,char ** argv)27 int main(int argc, char** argv)
28 {
29 CLI::App app{"Monitor GPIO line for requested state change"};
30
31 // Read arguments.
32 std::string path{};
33 std::string key{};
34 std::string polarity{};
35 std::string target{};
36 bool continueRun = false;
37
38 /* Add an input option */
39 app.add_option("-p,--path", path,
40 "Path of input device. Ex: /dev/input/event2")
41 ->required();
42 app.add_option("-k,--key", key, "Input GPIO key number")->required();
43 app.add_option("-r,--polarity", polarity,
44 "Asertion polarity to look for. This is 0 / 1")
45 ->required();
46 app.add_option("-t,--target", target,
47 "Systemd unit to be called on GPIO state change")
48 ->required();
49 app.add_flag("-c,--continue", continueRun,
50 "Whether or not to continue after key pressed");
51
52 /* Due to the way this process is loaded from systemd, we can end up with
53 * an empty extra parameter. Go ahead and ignore it. */
54 app.allow_extras();
55
56 /* Parse input parameter */
57 try
58 {
59 app.parse(argc, argv);
60 }
61 catch (const CLI::Error& e)
62 {
63 return app.exit(e);
64 }
65
66 sd_event* event = nullptr;
67 auto r = sd_event_default(&event);
68 if (r < 0)
69 {
70 lg2::error("Error creating a default sd_event handler");
71 return r;
72 }
73 phosphor::gpio::EventPtr eventP{event};
74 event = nullptr;
75
76 // Create a monitor object and let it do all the rest
77 phosphor::gpio::Monitor monitor(path, std::stoi(key), std::stoi(polarity),
78 target, eventP, continueRun);
79
80 // Wait for client requests until this application has processed
81 // at least one expected GPIO state change
82 while (!monitor.completed())
83 {
84 // -1 denotes wait for ever
85 r = sd_event_run(eventP.get(), (uint64_t)-1);
86 if (r < 0)
87 {
88 lg2::error("Failure in processing request: {RC}", "RC", r);
89 return r;
90 }
91 }
92
93 return 0;
94 }
95