[PATCH 3/3] hpwdt: implement WDIOC_GETTIMELEFT

[dann frazier <dannf@hp.com>]

Let applications check the amount of time left before the watchdog will fire.

Signed-off-by: dann frazier <dannf@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