102 lines
2.7 KiB
Plaintext
102 lines
2.7 KiB
Plaintext
#
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# NCD input event handling example program.
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#
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# This program responds to volume key presses by synchronously calling an external
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# script for muting and adjusting volume, and responds to power button presses by
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# suspending using pm-suspend.
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#
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# It uses process_manager() and sys.watch_input() to dynamically create and remove
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# processes that deal with specific input devices. The individual input device processes
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# then use sys.evdev() to handle input events from their input device.
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#
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process events_main {
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# Volume control script, called with argument "up", "down" or "mute".
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var("/usr/local/bin/volumekey") volume_script;
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# Suspend command.
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list("/usr/sbin/pm-suspend") suspend_cmd;
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provide("GLOBAL");
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}
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process events_watcher {
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depend("GLOBAL");
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# Create process manager.
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process_manager() manager;
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# Wait for input device events.
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sys.watch_input("event") watcher;
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# Dispatch.
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concat("events_watcher_", watcher.event_type) func;
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call(func, {});
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# Next event.
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watcher->nextevent();
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}
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template events_watcher_added {
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# Start event handling process for this device.
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_caller.manager->start(_caller.watcher.devname, "events_input_device", {_caller.watcher.devname});
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}
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template events_watcher_removed {
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# Stop event handling process for this device.
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_caller.manager->stop(_caller.watcher.devname);
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}
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template events_input_device {
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# Alias arguments.
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var(_arg0) dev;
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# Get global.
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depend("GLOBAL") gdep;
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# Wait for input events.
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sys.evdev(dev) evdev;
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# Query event details.
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strcmp(evdev.code, "KEY_MUTE") is_mute;
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strcmp(evdev.code, "KEY_VOLUMEUP") is_vup;
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strcmp(evdev.code, "KEY_VOLUMEDOWN") is_vdown;
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strcmp(evdev.code, "KEY_POWER") is_power;
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strcmp(evdev.value, "1") is_pressed;
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# Compute where to dispatch the event.
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and(is_mute, is_pressed) dispatch_mute;
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and(is_vup, is_pressed) dispatch_vup;
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and(is_vdown, is_pressed) dispatch_vdown;
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and(is_power, is_pressed) dispatch_power;
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# Dispatch event.
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choose({
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{dispatch_mute, "events_input_event_mute"},
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{dispatch_vup, "events_input_event_vup"},
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{dispatch_vdown, "events_input_event_vdown"},
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{dispatch_power, "events_input_event_power"}},
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"<none>"
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) func;
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call(func, {});
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# Next event.
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evdev->nextevent();
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}
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template events_input_event_mute {
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runonce({_caller.gdep.volume_script, "mute"});
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}
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template events_input_event_vup {
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runonce({_caller.gdep.volume_script, "up"});
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}
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template events_input_event_vdown {
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runonce({_caller.gdep.volume_script, "down"});
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}
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template events_input_event_power {
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runonce(_caller.gdep.suspend_cmd);
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}
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