watchdog: WatchDog Timer Driver Core - Part 3
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@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Wim Van Sebroeck <wim@xxxxxxxxx>
diff -urN linux-2.6.38-generic-part2/Documentation/watchdog/src/watchdog-with-timer-example.c linux-2.6.38-generic-part3/Documentation/watchdog/src/watchdog-with-timer-example.c
--- linux-2.6.38-generic-part2/Documentation/watchdog/src/watchdog-with-timer-example.c 2011-06-16 20:07:44.671177621 +0200
+++ linux-2.6.38-generic-part3/Documentation/watchdog/src/watchdog-with-timer-example.c 2011-06-16 20:07:53.631174037 +0200
@@ -117,6 +117,7 @@
*/
static const struct watchdog_info wdt_info = {
.identity = DRV_NAME,
+ .options = WDIOF_KEEPALIVEPING,
};
static const struct watchdog_ops wdt_ops = {
diff -urN linux-2.6.38-generic-part2/Documentation/watchdog/watchdog-kernel-api.txt linux-2.6.38-generic-part3/Documentation/watchdog/watchdog-kernel-api.txt
--- linux-2.6.38-generic-part2/Documentation/watchdog/watchdog-kernel-api.txt 2011-06-16 16:57:31.388541823 +0200
+++ linux-2.6.38-generic-part3/Documentation/watchdog/watchdog-kernel-api.txt 2011-06-16 18:44:20.747179936 +0200
@@ -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 -urN linux-2.6.38-generic-part2/drivers/watchdog/core/watchdog_dev.c linux-2.6.38-generic-part3/drivers/watchdog/core/watchdog_dev.c
--- linux-2.6.38-generic-part2/drivers/watchdog/core/watchdog_dev.c 2011-06-16 19:34:22.927178838 +0200
+++ linux-2.6.38-generic-part3/drivers/watchdog/core/watchdog_dev.c 2011-06-16 19:35:22.415178710 +0200
@@ -153,6 +153,11 @@
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;
}
--
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