diff options
| -rw-r--r-- | Documentation/watchdog/watchdog-kernel-api.txt | 5 | ||||
| -rw-r--r-- | drivers/watchdog/watchdog_dev.c | 6 | ||||
| -rw-r--r-- | include/linux/watchdog.h | 2 |
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 |