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-rw-r--r--Documentation/watchdog/watchdog-kernel-api.txt5
-rw-r--r--drivers/watchdog/watchdog_dev.c6
-rw-r--r--include/linux/watchdog.h2
3 files changed, 13 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:
diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
index ac20f92347b..e7134a5979c 100644
--- a/drivers/watchdog/watchdog_dev.c
+++ b/drivers/watchdog/watchdog_dev.c
@@ -180,6 +180,12 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
unsigned int val;
int err;
+ if (wdd->ops->ioctl) {
+ err = wdd->ops->ioctl(wdd, cmd, arg);
+ if (err != -ENOIOCTLCMD)
+ return err;
+ }
+
switch (cmd) {
case WDIOC_GETSUPPORT:
return copy_to_user(argp, wdd->info,
diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index f719883c514..325d90b6641 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -70,6 +70,7 @@ struct watchdog_device;
* @ping: The routine that sends a keepalive ping to the watchdog device.
* @status: The routine that shows the status of the watchdog device.
* @set_timeout:The routine for setting the watchdog devices timeout value.
+ * @ioctl: The routines that handles extra ioctl calls.
*
* The watchdog_ops structure contains a list of low-level operations
* that control a watchdog device. It also contains the module that owns
@@ -85,6 +86,7 @@ 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);
};
/** struct watchdog_device - The structure that defines a watchdog device