watchdog: WatchDog Timer Driver Core - Add basic ioctl functionality

This part add's the basic ioctl functionality to the
WatchDog Timer Driver Core framework. The supported
ioctl call's are:
	WDIOC_GETSUPPORT
	WDIOC_GETSTATUS
	WDIOC_GETBOOTSTATUS

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>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
index 5ab31bfd2906..29ff80807dd4 100644
--- a/include/linux/watchdog.h
+++ b/include/linux/watchdog.h
@@ -68,6 +68,7 @@ struct watchdog_device;
  * @start:      The routine for starting the watchdog device.
  * @stop:       The routine for stopping the 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.
  *
  * The watchdog_ops structure contains a list of low-level operations
  * that control a watchdog device. It also contains the module that owns
@@ -81,12 +82,14 @@ struct watchdog_ops {
         int (*stop)(struct watchdog_device *);
         /* optional operations */
         int (*ping)(struct watchdog_device *);
+        unsigned int (*status)(struct watchdog_device *);
 };
 
 /** struct watchdog_device - The structure that defines a watchdog device
  *
  * @info:       Pointer to a watchdog_info structure.
  * @ops:        Pointer to the list of watchdog operations.
+ * @bootstatus: Status of the watchdog device at boot.
  * @driver-data:Pointer to the drivers private data.
  * @status:     Field that contains the devices internal status bits.
  *
@@ -99,6 +102,7 @@ struct watchdog_ops {
 struct watchdog_device {
         const struct watchdog_info *info;
         const struct watchdog_ops *ops;
+        unsigned int bootstatus;
         void *driver_data;
         unsigned long status;
 /* Bit numbers for status flags */