path: root/Documentation/watchdog
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authorWim Van Sebroeck <wim@iguana.be>2011-07-22 18:59:49 +0000
committerWim Van Sebroeck <wim@iguana.be>2011-07-28 08:01:16 +0000
commit78d88fc01202b088573c962e2885556a5e99bf74 (patch)
tree8f5650e80988752d144c4575ae4d2b4e846e2aa5 /Documentation/watchdog
parent7e192b9c4234d29bdc20ac8d0a67edf7624b4206 (diff)
watchdog: WatchDog Timer Driver Core - Add ioctl call
Add support for extra ioctl calls by adding a ioctl watchdog operation. This operation will be called before we do our own handling of ioctl commands. This way we can override the internal ioctl command handling and we can also add extra ioctl commands. The ioctl watchdog operation should return the appropriate error codes or -ENOIOCTLCMD if the ioctl command should be handled through the internal ioctl handling of the 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, 5 insertions, 0 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
index 785fa0c996a..829955bd245 100644
--- a/Documentation/watchdog/watchdog-kernel-api.txt
+++ b/Documentation/watchdog/watchdog-kernel-api.txt
@@ -73,6 +73,7 @@ struct watchdog_ops {
int (*ping)(struct watchdog_device *);
unsigned int (*status)(struct watchdog_device *);
int (*set_timeout)(struct watchdog_device *, unsigned int);
+ long (*ioctl)(struct watchdog_device *, unsigned int, unsigned long);
It is important that you first define the module owner of the watchdog timer
@@ -117,6 +118,10 @@ they are supported. These optional routines/operations are:
to re-program the watchdog timer device.
(Note: the WDIOF_SETTIMEOUT needs to be set in the options field of the
watchdog's info structure).
+* ioctl: if this routine is present then it will be called first before we do
+ our own internal ioctl call handling. This routine should return -ENOIOCTLCMD
+ if a command is not supported. The parameters that are passed to the ioctl
+ call are: watchdog_device, cmd and arg.
The status bits should (preferably) be set with the set_bit and clear_bit alike
bit-operations. The status bits that are defined are: