WatchDog Timer Driver Core

modulename: watchdog.ko

configname: CONFIG_WATCHDOG_CORE

Linux Kernel Configuration
└─>Device Drivers
└─>Watchdog Timer Support
└─>WatchDog Timer Driver Core
In linux kernel since version 3.1 (release Date: 2011-10-24)  
Say Y here if you want to use the new watchdog timer driver core.
This driver provides a framework for all watchdog timer drivers
and gives them the /dev/watchdog interface (and later also the
sysfs interface).

source code:
drivers/watchdog/
depends
CONFIG_WATCHDOG