[WATCHDOG] w83697hf/hg WDT driver - patch 15

This is patch 15 in the series of patches that converts
Marcus Junker's w83697hf watchdog driver to Samuel Tardieau's
w83697hf/hg watchdog driver.

This patch contains following changes:
 - Clean-up initialization code - part 2: 
   * the line reading "set second mode & disable keyboard ..."
     is plain wrong, the register being manipulated (CRF4) is
     the counter itself, not the control byte (CRF3) -- looks
     like it has been copied from another driver.
   * I think garbage is being written in CRF3 (the control word)
     as the timeout value is being stored in this register (such
     as 60 for 60 seconds).
   * We only want to set pin 119 to WDTO# mode and leave the rest
     of CR29 like it is.
   * Set count mode to seconds and not minutes.
Signed-off-by: Samuel Tardieu <sam@rfc1149.net>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

drivers/char/watchdog/w83697hf_wdt.c

@@ -123,20 +123,18 @@ w83697hf_deselect_wdt(void)
 static void
 w83697hf_init(void)
 {
-	unsigned char t;
+	unsigned char bbuf;
 
 	w83697hf_select_wdt();
 
-	w83697hf_set_reg(0x29, 0x20);	/* Set pin 119 to WDTO# mode (= CR29, WDT0) */
+	bbuf = w83697hf_get_reg(0x29);
+	bbuf &= ~0x60;
+	bbuf |= 0x20;
+	w83697hf_set_reg(0x29, bbuf);	/* Set pin 119 to WDTO# mode (= CR29, WDT0) */
 
-	t = w83697hf_get_reg(0xF3);	/* Read CRF3 */
-	if (t != 0) {
-		printk (KERN_INFO PFX "Watchdog already running. Resetting timeout to %d sec\n", timeout);
-		w83697hf_set_reg(0xF3, timeout);	/* Write new timeout */
-	}
-	t = w83697hf_get_reg(0xF4);	/* Read CRF4 */
-	t&=~0x0C;			/* set second mode & disable keyboard turning off watchdog */
-	w83697hf_set_reg(0xF4, t);	/* Write back to CRF4 */
+	bbuf = w83697hf_get_reg(0xF3);
+	bbuf &= ~0x04;
+	w83697hf_set_reg(0xF3, bbuf);	/* Count mode is seconds */
 
 	w83697hf_deselect_wdt();
 }