[WATCHDOG] ib700wdt - add timeout parameter
Add the timeout module parameter to ib700wdt.c
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
diff --git a/drivers/watchdog/ib700wdt.c b/drivers/watchdog/ib700wdt.c
index 317ef2b..4bef3dd 100644
--- a/drivers/watchdog/ib700wdt.c
+++ b/drivers/watchdog/ib700wdt.c
@@ -91,32 +91,16 @@
*
*/
-static int wd_times[] = {
- 30, /* 0x0 */
- 28, /* 0x1 */
- 26, /* 0x2 */
- 24, /* 0x3 */
- 22, /* 0x4 */
- 20, /* 0x5 */
- 18, /* 0x6 */
- 16, /* 0x7 */
- 14, /* 0x8 */
- 12, /* 0x9 */
- 10, /* 0xA */
- 8, /* 0xB */
- 6, /* 0xC */
- 4, /* 0xD */
- 2, /* 0xE */
- 0, /* 0xF */
-};
-
#define WDT_STOP 0x441
#define WDT_START 0x443
/* Default timeout */
-#define WD_TIMO 0 /* 30 seconds +/- 20%, from table */
-
-static int wd_margin = WD_TIMO;
+#define WATCHDOG_TIMEOUT 30 /* 30 seconds +/- 20% */
+static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout,
+ "Watchdog timeout in seconds. 0<= timeout <=30, default="
+ __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
static int nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, int, 0);
@@ -131,6 +115,8 @@
static void ibwdt_ping(void)
{
+ int wd_margin = 15 - ((timeout + 1) / 2);
+
spin_lock(&ibwdt_lock);
/* Write a watchdog value */
@@ -148,15 +134,10 @@
static int ibwdt_set_heartbeat(int t)
{
- int i;
-
- if ((t < 0) || (t > 30))
+ if (t < 0 || t > 30)
return -EINVAL;
- for (i = 0x0F; i > -1; i--)
- if (wd_times[i] >= t)
- break;
- wd_margin = i;
+ timeout = t;
return 0;
}
@@ -240,7 +221,7 @@
/* Fall */
case WDIOC_GETTIMEOUT:
- return put_user(wd_times[wd_margin], p);
+ return put_user(timeout, p);
default:
return -ENOTTY;
@@ -317,6 +298,14 @@
goto out_nostartreg;
}
+ /* Check that the heartbeat value is within it's range ;
+ * if not reset to the default */
+ if (ibwdt_set_heartbeat(timeout)) {
+ ibwdt_set_heartbeat(WATCHDOG_TIMEOUT);
+ printk(KERN_INFO PFX
+ "timeout value must be 0<=x<=30, using %d\n", timeout);
+ }
+
res = misc_register(&ibwdt_miscdev);
if (res) {
printk(KERN_ERR PFX "failed to register misc device\n");