path: root/Documentation/watchdog
diff options
authorWim Van Sebroeck <wim@iguana.be>2011-07-22 18:57:55 +0000
committerWim Van Sebroeck <wim@iguana.be>2011-07-28 08:01:09 +0000
commit234445b4e4542f3e0f216459245ab369a18adcf2 (patch)
treeed670bb2aa3eae41f00e5217fb786eaa9fbe6cb3 /Documentation/watchdog
parentc2dc00e494cc476551b9beeb883910391ff59737 (diff)
watchdog: WatchDog Timer Driver Core - Add WDIOC_SETOPTIONS ioctl
This part add's the WDIOC_SETOPTIONS ioctl functionality to the WatchDog Timer Driver Core framework. 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>
Diffstat (limited to 'Documentation/watchdog')
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index abbcf2ce8f6..429f81bf0cf 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -56,8 +56,9 @@ It contains following fields:
This data should only be accessed via the watchdog_set_drvadata and
watchdog_get_drvdata routines.
* status: this field contains a number of status bits that give extra
- information about the status of the device (Like: is the device opened via
- the /dev/watchdog interface or not, ...).
+ information about the status of the device (Like: is the watchdog timer
+ running/active, is the device opened via the /dev/watchdog interface or not,
+ ...).
The list of watchdog operations is defined as:
@@ -109,6 +110,10 @@ they are supported. These optional routines/operations are:
The status bits should (preferably) be set with the set_bit and clear_bit alike
bit-operations. The status bits that are defined are:
+* WDOG_ACTIVE: this status bit indicates whether or not a watchdog timer device
+ is active or not. When the watchdog is active after booting, then you should
+ set this status bit (Note: when you register the watchdog timer device with
+ this bit set, then opening /dev/watchdog will skip the start operation)
* WDOG_DEV_OPEN: this status bit shows whether or not the watchdog device
was opened via /dev/watchdog.
(This bit should only be used by the WatchDog Timer Driver Core).