1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
//! mmx150 — connection monitoring for the beyerdynamic MMX 150 wireless
//! dongle.
use std::process::{Child, Command, ExitCode, Stdio};
use std::time::{Duration, Instant, SystemTime, UNIX_EPOCH};
use mmx150::hid::{find_mmx150, Hidraw};
use mmx150::protocol::{self, LinkState, StateTracker, Transition};
fn main() -> ExitCode {
let args: Vec<String> = std::env::args().skip(1).collect();
match args.first().map(String::as_str) {
Some("status") => cmd_status(),
Some("daemon") => cmd_daemon(&args[1..]),
Some("probe") => cmd_probe(),
_ => {
print_usage();
ExitCode::FAILURE
}
}
}
fn print_usage() {
eprintln!(
"usage: mmx150 <status|daemon>\n\
\n\
daemon options:\n\
\x20 --on-connect CMD run CMD (via sh -c) when the headset connects\n\
\x20 --on-disconnect CMD run CMD (via sh -c) when the headset disconnects\n\
\x20 --interval SECS poll interval (default: 2)\n\
\x20 --no-initial do not fire a hook for the state found at startup\n\
\n\
status exit codes: 0 connected, 1 disconnected, 2 dongle missing/error\n\
\n\
example:\n\
\x20 mmx150 daemon \\\n\
\x20 --on-connect 'wpctl set-default <mmx150-sink-id>' \\\n\
\x20 --on-disconnect 'wpctl set-default <speakers-sink-id>'\n\
\n\
find sink ids with: wpctl status"
);
}
fn cmd_status() -> ExitCode {
let Some(dev) = find_mmx150().unwrap_or(None) else {
eprintln!("dongle not found");
return ExitCode::from(2);
};
let hid = match Hidraw::open(&dev.devnode) {
Ok(h) => h,
Err(e) => {
eprintln!("error: {e}");
return ExitCode::from(2);
}
};
let mut hid = hid;
match protocol::link_status(&mut hid) {
Ok(LinkState::Connected) => {
println!("connected");
ExitCode::SUCCESS
}
Ok(LinkState::Disconnected) => {
println!("disconnected");
ExitCode::from(1)
}
Err(e) => {
eprintln!("error: {e}");
ExitCode::from(2)
}
}
}
fn cmd_daemon(args: &[String]) -> ExitCode {
let mut on_connect: Option<String> = None;
let mut on_disconnect: Option<String> = None;
let mut interval = Duration::from_secs(2);
let mut no_initial = false;
let mut it = args.iter();
while let Some(arg) = it.next() {
match arg.as_str() {
"--on-connect" => match it.next() {
Some(c) => on_connect = Some(c.clone()),
None => {
eprintln!("--on-connect needs an argument");
return ExitCode::FAILURE;
}
},
"--on-disconnect" => match it.next() {
Some(c) => on_disconnect = Some(c.clone()),
None => {
eprintln!("--on-disconnect needs an argument");
return ExitCode::FAILURE;
}
},
"--interval" => match it.next().and_then(|s| s.parse::<u64>().ok()) {
Some(secs) if secs > 0 => interval = Duration::from_secs(secs),
_ => {
eprintln!("--interval needs a number of seconds > 0");
return ExitCode::FAILURE;
}
},
"--no-initial" => no_initial = true,
other => {
eprintln!("unknown option: {other}");
return ExitCode::FAILURE;
}
}
}
let mut hid: Option<Hidraw> = None;
let mut tracker = StateTracker::new(!no_initial);
let mut children: Vec<Child> = Vec::new();
loop {
let cycle = Instant::now();
reap_children(&mut children);
let link_up = poll(&mut hid);
match tracker.update(link_up) {
Some(Transition::ToConnected { initial }) => {
log_state("connected", initial);
if let Some(cmd) = &on_connect {
spawn_hook(cmd, &mut children);
}
}
Some(Transition::ToDisconnected { initial }) => {
log_state("disconnected", initial);
if let Some(cmd) = &on_disconnect {
spawn_hook(cmd, &mut children);
}
}
None => {}
}
let elapsed = cycle.elapsed();
if elapsed < interval {
std::thread::sleep(interval - elapsed);
}
}
}
/// One poll cycle: (re)open the dongle if needed, then query the link.
/// Returns `true` if the headset answered.
fn poll(hid: &mut Option<Hidraw>) -> bool {
if hid.is_none() {
match find_mmx150() {
Ok(Some(dev)) => match Hidraw::open(&dev.devnode) {
Ok(h) => *hid = Some(h),
Err(_) => return false,
},
_ => return false,
}
}
let Some(h) = hid.as_mut() else {
return false;
};
match protocol::link_status(h) {
Ok(LinkState::Connected) => true,
Ok(LinkState::Disconnected) => false,
Err(_) => {
*hid = None;
false
}
}
}
fn spawn_hook(cmd: &str, children: &mut Vec<Child>) {
match Command::new("sh")
.arg("-c")
.arg(cmd)
.stdin(Stdio::null())
.stdout(Stdio::null())
.stderr(Stdio::null())
.spawn()
{
Ok(child) => children.push(child),
Err(e) => eprintln!("[{}] hook spawn failed: {e}", timestamp()),
}
}
/// Reap finished hook processes so they don't linger as zombies.
fn reap_children(children: &mut Vec<Child>) {
children.retain_mut(|c| c.try_wait().map_or(true, |s| s.is_none()));
}
fn log_state(state: &str, initial: bool) {
println!(
"[{}] headset {}{}",
timestamp(),
state,
if initial { " (initial)" } else { "" }
);
}
fn timestamp() -> u64 {
SystemTime::now()
.duration_since(UNIX_EPOCH)
.map(|d| d.as_secs())
.unwrap_or(0)
}
fn cmd_probe() -> ExitCode {
eprintln!("use `mmx150-probe` binary instead");
ExitCode::FAILURE
}
|
