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| author | Wim Van Sebroeck <wim@iguana.be> | 2011-07-22 18:58:21 +0000 |
|---|---|---|
| committer | Wim Van Sebroeck <wim@iguana.be> | 2011-07-28 08:01:11 +0000 |
| commit | 014d694e5d59e4219803cd14deaae496d86e4910 (patch) | |
| tree | c79d00c812b6f01fc477318cbcc003e2826f9f24 /Documentation/watchdog | |
| parent | 234445b4e4542f3e0f216459245ab369a18adcf2 (diff) | |
| download | lwn-014d694e5d59e4219803cd14deaae496d86e4910.tar.gz lwn-014d694e5d59e4219803cd14deaae496d86e4910.zip | |
watchdog: WatchDog Timer Driver Core - Add WDIOC_SETTIMEOUT and WDIOC_GETTIMEOUT ioctl
This part add's the WDIOC_SETTIMEOUT and WDIOC_GETTIMEOUT ioctl
functionality to the WatchDog Timer Driver Core 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>
Diffstat (limited to 'Documentation/watchdog')
| -rw-r--r-- | Documentation/watchdog/watchdog-kernel-api.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt index 429f81bf0cf7..acdee39fb08a 100644 --- a/Documentation/watchdog/watchdog-kernel-api.txt +++ b/Documentation/watchdog/watchdog-kernel-api.txt @@ -42,6 +42,7 @@ struct watchdog_device { const struct watchdog_info *info; const struct watchdog_ops *ops; unsigned int bootstatus; + unsigned int timeout; void *driver_data; unsigned long status; }; @@ -50,6 +51,7 @@ 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. +* timeout: the watchdog timer's timeout value (in seconds). * 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. @@ -70,6 +72,7 @@ struct watchdog_ops { /* optional operations */ int (*ping)(struct watchdog_device *); unsigned int (*status)(struct watchdog_device *); + int (*set_timeout)(struct watchdog_device *, unsigned int); }; It is important that you first define the module owner of the watchdog timer @@ -107,6 +110,13 @@ they are supported. These optional routines/operations are: info structure). * status: this routine checks the status of the watchdog timer device. The status of the device is reported with watchdog WDIOF_* status flags/bits. +* set_timeout: this routine checks and changes the timeout of the watchdog + timer device. It returns 0 on success, -EINVAL for "parameter out of range" + and -EIO for "could not write value to the watchdog". On success the timeout + value of the watchdog_device will be changed to the value that was just used + 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). The status bits should (preferably) be set with the set_bit and clear_bit alike bit-operations. The status bits that are defined are: |