watchdog: f71808e_wdt: add support for the F71889FG

Signed-off-by: Giel van Schijndel <me@mortis.eu>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/watchdog/Kconfig

@@ -409,11 +409,11 @@ config ALIM7101_WDT
 	  Most people will say N.
 
 config F71808E_WDT
-	tristate "Fintek F71808E and F71882FG Watchdog"
+	tristate "Fintek F71808E, F71882FG and F71889FG Watchdog"
 	depends on X86 && EXPERIMENTAL
 	help
 	  This is the driver for the hardware watchdog on the Fintek
-	  F71808E and F71882FG Super I/O controllers.
+	  F71808E, F71882FG and F71889FG Super I/O controllers.
 
 	  You can compile this driver directly into the kernel, or use
 	  it as a module.  The module will be called f71808e_wdt.

drivers/watchdog/f71808e_wdt.c

@@ -308,6 +308,12 @@ static int watchdog_start(void)
 		superio_set_bit(watchdog.sioaddr, 0x29, 1);
 		break;
 
+	case f71889fg:
+		/* set pin 40 to WDTRST# */
+		superio_outb(watchdog.sioaddr, 0x2b,
+				superio_inb(watchdog.sioaddr, 0x2b) & 0xcf);
+		break;
+
 	default:
 		/*
 		 * 'default' label to shut up the compiler and catch
@@ -708,8 +714,10 @@ static int __init f71808e_find(int sioaddr)
 	case SIO_F71882_ID:
 		watchdog.type = f71882fg;
 		break;
-	case SIO_F71862_ID:
 	case SIO_F71889_ID:
+		watchdog.type = f71889fg;
+		break;
+	case SIO_F71862_ID:
 		/* These have a watchdog, though it isn't implemented (yet). */
 		err = -ENOSYS;
 		goto exit;