[PATCH 1/1] watchdog: imx2: Added ioctl options to enable/disable watchdog as wanted by systemd.

[Tord Andersson <tord.o.andersson@gmail.com>]

When the current imx2 watchdog driver is used with the systemd watchdog feature,
we get "Failed to enable hardware watchdog: Inappropriate ioctl for device".
This is caused by missing ioctl setoptions to enable the watchdog.
This patch will add WDIOC_SETOPTIONS for WDIOS_ENABLECARD and WDIOS_DISABLECARD.

Signed-off-by: Tord Andersson <tord.andersson@endian.se>
---
 drivers/watchdog/imx2_wdt.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/watchdog/imx2_wdt.c b/drivers/watchdog/imx2_wdt.c
index dd51d95..180c6a5 100644
--- a/drivers/watchdog/imx2_wdt.c
+++ b/drivers/watchdog/imx2_wdt.c
@@ -196,6 +196,17 @@ static long imx2_wdt_ioctl(struct file *file, unsigned int cmd,
 		new_value = val & IMX2_WDT_WRSR_TOUT ? WDIOF_CARDRESET : 0;
 		return put_user(new_value, p);
 
+	case WDIOC_SETOPTIONS:
+		if (get_user(new_value, p))
+			return -EFAULT;
+		if (new_value & WDIOS_ENABLECARD)
+			imx2_wdt_start();
+		else if (new_value & WDIOS_DISABLECARD)
+			imx2_wdt_stop();
+		else
+			return -EINVAL;
+		return 0;
+
 	case WDIOC_KEEPALIVE:
 		imx2_wdt_ping();
 		return 0;
-- 
1.9.1