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watchdog: WatchDog Timer Driver Core - Add WDIOC_SETOPTIONS ioctl

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This part add's the WDIOC_SETOPTIONS ioctl functionality
to the WatchDog Timer Driver Core framework.

Signed-off-by: Alan Cox <[email protected]>
Signed-off-by: Wim Van Sebroeck <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
This commit is contained in:
Wim Van Sebroeck 2011-07-22 18:57:55 +00:00
commit 234445b4e4
3 changed files with 80 additions and 9 deletions
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9
Documentation/watchdog/watchdog-kernel-api.txt
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@ -56,8 +56,9 @@ It contains following fields:
This data should only be accessed via the watchdog_set_drvadata and
watchdog_get_drvdata routines.
* status: this field contains a number of status bits that give extra
information about the status of the device (Like: is the device opened via
the /dev/watchdog interface or not, ...).
information about the status of the device (Like: is the watchdog timer
running/active, is the device opened via the /dev/watchdog interface or not,
...).
The list of watchdog operations is defined as:
@ -109,6 +110,10 @@ they are supported. These optional routines/operations are:
The status bits should (preferably) be set with the set_bit and clear_bit alike
bit-operations. The status bits that are defined are:
* WDOG_ACTIVE: this status bit indicates whether or not a watchdog timer device
is active or not. When the watchdog is active after booting, then you should
set this status bit (Note: when you register the watchdog timer device with
this bit set, then opening /dev/watchdog will skip the start operation)
* WDOG_DEV_OPEN: this status bit shows whether or not the watchdog device
was opened via /dev/watchdog.
(This bit should only be used by the WatchDog Timer Driver Core).