watchdog: WatchDog Timer Driver Core - Add WDIOC_KEEPALIVE ioctl
This part add's the WDIOC_KEEPALIVE ioctl functionality to the
WatchDog Timer Driver Core framework. Please note that the
WDIOF_KEEPALIVEPING bit has to be set in the watchdog_info
options field.
Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index 2bdc6dc..abbcf2c 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -101,6 +101,9 @@
the watchdog timer driver core does: to send a keepalive ping to the watchdog
timer hardware it will either use the ping operation (when available) or the
start operation (when the ping operation is not available).
+ (Note: the WDIOC_KEEPALIVE ioctl call will only be active when the
+ WDIOF_KEEPALIVEPING bit has been set in the option field on the watchdog's
+ info structure).
* status: this routine checks the status of the watchdog timer device. The
status of the device is reported with watchdog WDIOF_* status flags/bits.
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index 00a6112..2fb4cec 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -120,6 +120,11 @@
return put_user(val, p);
case WDIOC_GETBOOTSTATUS:
return put_user(wdd->bootstatus, p);
+ case WDIOC_KEEPALIVE:
+ if (!(wdd->info->options & WDIOF_KEEPALIVEPING))
+ return -EOPNOTSUPP;
+ watchdog_ping(wdd);
+ return 0;
default:
return -ENOTTY;
}