Openwrt/package/hotplug2/files/hotplug2.rules

$include /etc/hotplug2-common.rules

SUBSYSTEM ~~ (^net$|^input$|^button$|^usb$|^platform$|^ieee1394$|^block$|^atm$) {
	exec /sbin/hotplug-call %SUBSYSTEM%
}

DEVICENAME == watchdog {
	exec /sbin/watchdog -t 5 /dev/watchdog
	next-event
}