openwrt/package/hotplug2/files/hotplug2.rules

DEVICENAME ~~ (tun|tap[0-9]) {
	makedev /dev/net/%DEVICENAME% 0644
	next
}

DEVICENAME ~~ (controlC[0-9]|pcmC0D0*) {
        makedev /dev/snd/%DEVICENAME% 0644
        next
}

DEVPATH is set {
	makedev /dev/%DEVICENAME% 0644
}

FIRMWARE is set {
	exec /sbin/hotplug-call firmware;
	next
}

SUBSYSTEM ~~ (net|button) {
	exec /sbin/hotplug-call %SUBSYSTEM%;
}