[WATCHDOG] Add driver for winbond w83697ug/uf watchdog feature

Adapted the w83627hf_wdt.c driver to work with the w83697ug/uf chip, 
found on MSI Fuzzy CX700 boards.

The method used is taken directly from the winbond datasheet and 
surprisingly it differs slightly from all the other winbond watchdogs.

So far it has only been tested on the CX700 board that I have, but it 
seems to work nicely.

Signed-off-by: Flemming Frandsen <ff@nrvissing.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/Kconfig

@@ -585,6 +585,21 @@ config W83697HF_WDT
 
 	  Most people will say N.
 
+config W83697UG_WDT
+	tristate "W83697UG/W83697UF Watchdog Timer"
+	depends on X86
+	---help---
+	  This is the driver for the hardware watchdog on the W83697UG/UF
+	  chipset as used in MSI Fuzzy CX700 VIA motherboards (and likely others).
+	  This watchdog simply watches your kernel to make sure it doesn't
+	  freeze, and if it does, it reboots your computer after a certain
+	  amount of time.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called w83697ug_wdt.
+
+	  Most people will say N.
+
 config W83877F_WDT
 	tristate "W83877F (EMACS) Watchdog Timer"
 	depends on X86