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From: dann frazier on 2 Jun 2010 18:30
Let applications check the amount of time left before the watchdog will fire.

Signed-off-by: dann frazier <dannf(a)hp.com>
---
drivers/watchdog/hpwdt.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index e3bf645..dbe650e 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -443,6 +443,11 @@ static void hpwdt_ping(void)
iowrite16(reload, hpwdt_timer_reg);
}

+static int hpwdt_time_left(void)
+{
+ return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
+}
+
static int hpwdt_change_timer(int new_margin)
{
if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
@@ -583,6 +588,10 @@ static long hpwdt_ioctl(struct file *file, unsigned int cmd,
ret = put_user(0, p);
break;

+ case WDIOC_GETTIMELEFT:
+ ret = put_user(hpwdt_time_left(), p);
+ break;
+
case WDIOC_KEEPALIVE:
hpwdt_ping();
ret = 0;
--
1.7.1

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Prev: [PATCH 2/3] hpwdt: allow full range of timer values supported by hardware
Next: How to stop kernel rebooting during startup?