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[WATCHDOG] w83697ug: add error checking 

I noticed the W83697UG driver tries to register a watchdog even though
it already noticed the chip isn't there.

WDT driver for the Winbond(TM) W83697UG/UF Super I/O chip initialising.
w83697ug/uf WDT: No W83697UG/UF could be found
w83697ug/uf WDT: Watchdog already running. Resetting timeout to 60 sec
w83697ug/uf WDT: cannot register miscdev on minor=130 (err=-16)

Patch propagates the error back to wdt_init().

Signed-off-by: Eric Lammerts <eric@lammerts.org>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
Eric Lammerts 2009-02-03 17:45:56 -05:00 committed by Wim Van Sebroeck
parent 9626dd75c5
commit 63bad1452e
1 changed files with 15 additions and 6 deletions
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21
drivers/watchdog/w83697ug_wdt.c
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@ -79,7 +79,7 @@ MODULE_PARM_DESC(nowayout,
(same as EFER) */
#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
static void w83697ug_select_wd_register(void)
static int w83697ug_select_wd_register(void)
{
unsigned char c;
unsigned char version;
@ -102,7 +102,7 @@ static void w83697ug_select_wd_register(void)
} else {
printk(KERN_ERR PFX "No W83697UG/UF could be found\n");
return;
return -ENODEV;
}
outb_p(0x07, WDT_EFER); /* point to logical device number reg */
@ -110,6 +110,8 @@ static void w83697ug_select_wd_register(void)
outb_p(0x30, WDT_EFER); /* select CR30 */
c = inb_p(WDT_EFDR);
outb_p(c || 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
return 0;
}
static void w83697ug_unselect_wd_register(void)
@ -117,11 +119,14 @@ static void w83697ug_unselect_wd_register(void)
outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
}
static void w83697ug_init(void)
static int w83697ug_init(void)
{
int ret;
unsigned char t;
w83697ug_select_wd_register();
ret = w83697ug_select_wd_register();
if (ret != 0)
return ret;
outb_p(0xF6, WDT_EFER); /* Select CRF6 */
t = inb_p(WDT_EFDR); /* read CRF6 */
@ -137,13 +142,15 @@ static void w83697ug_init(void)
outb_p(t, WDT_EFDR); /* Write back to CRF5 */
w83697ug_unselect_wd_register();
return 0;
}
static void wdt_ctrl(int timeout)
{
spin_lock(&io_lock);
w83697ug_select_wd_register();
if (w83697ug_select_wd_register() < 0)
return;
outb_p(0xF4, WDT_EFER); /* Select CRF4 */
outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF4 */
@ -347,7 +354,9 @@ static int __init wdt_init(void)
goto out;
}
w83697ug_init();
ret = w83697ug_init();
if (ret != 0)
goto unreg_regions;
ret = register_reboot_notifier(&wdt_notifier);
if (ret != 0) {