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linux/Documentation/ABI/testing/sysfs-class-watchdog

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watchdog: Read device status through sysfs attributes This patch adds following attributes to watchdog device's sysfs interface to read its different status. * state - reads whether device is active or not * identity - reads Watchdog device's identity string. * timeout - reads current timeout. * timeleft - reads timeleft before watchdog generates a reset * bootstatus - reads status of the watchdog device at boot * status - reads watchdog device's internal status bits * nowayout - reads whether nowayout feature was set or not Testing with iTCO_wdt: # cd /sys/class/watchdog/watchdog1/ # ls bootstatus dev device identity nowayout power state subsystem timeleft timeout uevent # cat identity iTCO_wdt # cat timeout 30 # cat state inactive # echo > /dev/watchdog1 # cat timeleft 26 # cat state active # cat bootstatus 0 # cat nowayout 0 Signed-off-by: Pratyush Anand <panand@redhat.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2015-12-17 20:23:59 +08:00
What: /sys/class/watchdog/watchdogn/bootstatus
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It contains status of the watchdog
device at boot. It is equivalent to WDIOC_GETBOOTSTATUS of
ioctl interface.
What: /sys/class/watchdog/watchdogn/identity
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It contains identity string of
watchdog device.
What: /sys/class/watchdog/watchdogn/nowayout
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. While reading, it gives '1' if that
device supports nowayout feature else, it gives '0'.
What: /sys/class/watchdog/watchdogn/state
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It gives active/inactive status of
watchdog device.
What: /sys/class/watchdog/watchdogn/status
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It contains watchdog device's
internal status bits. It is equivalent to WDIOC_GETSTATUS
of ioctl interface.
What: /sys/class/watchdog/watchdogn/timeleft
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It contains value of time left for
reset generation. It is equivalent to WDIOC_GETTIMELEFT of
ioctl interface.
What: /sys/class/watchdog/watchdogn/timeout
Date: August 2015
Contact: Wim Van Sebroeck <wim@iguana.be>
Description:
It is a read only file. It is read to know about current
value of timeout programmed.