From 2fa03560ab3a6dd83cad9bfd5692179fc2ceabb3 Mon Sep 17 00:00:00 2001 From: Wim Van Sebroeck Date: Fri, 22 Jul 2011 18:56:38 +0000 Subject: 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 Signed-off-by: Wim Van Sebroeck Acked-by: Arnd Bergmann Acked-by: Wolfram Sang --- Documentation/watchdog/watchdog-kernel-api.txt | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'Documentation/watchdog') diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt index 3db67e74b80e..2bdc6dc6e04c 100644 --- a/Documentation/watchdog/watchdog-kernel-api.txt +++ b/Documentation/watchdog/watchdog-kernel-api.txt @@ -41,6 +41,7 @@ The watchdog device structure looks like this: struct watchdog_device { const struct watchdog_info *info; const struct watchdog_ops *ops; + unsigned int bootstatus; void *driver_data; unsigned long status; }; @@ -49,6 +50,8 @@ It contains following fields: * info: a pointer to a watchdog_info structure. This structure gives some additional information about the watchdog timer itself. (Like it's unique name) * ops: a pointer to the list of watchdog operations that the watchdog supports. +* bootstatus: status of the device after booting (reported with watchdog + WDIOF_* status bits). * driver_data: a pointer to the drivers private data of a watchdog device. This data should only be accessed via the watchdog_set_drvadata and watchdog_get_drvdata routines. @@ -65,6 +68,7 @@ struct watchdog_ops { int (*stop)(struct watchdog_device *); /* optional operations */ int (*ping)(struct watchdog_device *); + unsigned int (*status)(struct watchdog_device *); }; It is important that you first define the module owner of the watchdog timer @@ -97,6 +101,8 @@ they are supported. These optional routines/operations are: the watchdog timer driver core does: to send a keepalive ping to the watchdog timer hardware it will either use the ping operation (when available) or the start operation (when the ping operation is not available). +* status: this routine checks the status of the watchdog timer device. The + status of the device is reported with watchdog WDIOF_* status flags/bits. The status bits should (preferably) be set with the set_bit and clear_bit alike bit-operations. The status bits that are defined are: -- cgit v1.2.3-58-ga151