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| author | Wim Van Sebroeck <wim@iguana.be> | 2011-07-22 18:56:38 +0000 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2011-07-28 08:01:05 +0000 |
| commit | 2fa03560ab3a6dd83cad9bfd5692179fc2ceabb3 (patch) | |
| tree | b208649368917b6c8d16c5cc737b2b83e906d074 /Documentation/watchdog | |
| parent | 43316044d4f64da008d6aca7d4b60771b9a24eb8 (diff) | |
| download | lwn-2fa03560ab3a6dd83cad9bfd5692179fc2ceabb3.tar.gz lwn-2fa03560ab3a6dd83cad9bfd5692179fc2ceabb3.zip | |
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>
Diffstat (limited to 'Documentation/watchdog')
| -rw-r--r-- | Documentation/watchdog/watchdog-kernel-api.txt | 6 |
1 files changed, 6 insertions, 0 deletions
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: |