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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>
This commit is contained in:
Wim Van Sebroeck 2011-07-22 18:59:49 +00:00
parent 7e192b9c42
commit 78d88fc012
3 changed files with 13 additions and 0 deletions
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5
Documentation/watchdog/watchdog-kernel-api.txt
View File

@ -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:

6
drivers/watchdog/watchdog_dev.c
View File

@ -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,

2
include/linux/watchdog.h
View File

@ -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