watchdog: hpwdt (8/12): implement WDIOC_GETTIMELEFT

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

Signed-off-by: dann frazier <dannf@hp.com>
Acked-by: Thomas Mingarelli <Thomas.Mingarelli@hp.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index 00299919df39..554526cf3233 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -450,6 +450,11 @@ static int hpwdt_change_timer(int new_margin)
         return 0;
 }
 
+static int hpwdt_time_left(void)
+{
+        return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
+}
+
 /*
  *      NMI Handler
  */
@@ -591,6 +596,10 @@ static long hpwdt_ioctl(struct file *file, unsigned int cmd,
         case WDIOC_GETTIMEOUT:
                 ret = put_user(soft_margin, p);
                 break;
+
+        case WDIOC_GETTIMELEFT:
+                ret = put_user(hpwdt_time_left(), p);
+                break;
         }
         return ret;
 }