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Commit c2dc00e4 authored by Wim Van Sebroeck's avatar Wim Van Sebroeck
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watchdog: WatchDog Timer Driver Core - Add WDIOC_KEEPALIVE ioctl 



This part add's the WDIOC_KEEPALIVE ioctl functionality to the
WatchDog Timer Driver Core framework. Please note that the
WDIOF_KEEPALIVEPING bit has to be set in the watchdog_info
options field.

Signed-off-by: default avatarAlan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: default avatarWim Van Sebroeck <wim@iguana.be>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarWolfram Sang <w.sang@pengutronix.de>
parent 2fa03560

Documentation/watchdog/watchdog-kernel-api.txt

+3 −0
Original line number Diff line number Diff line
@@ -101,6 +101,9 @@ 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).

  (Note: the WDIOC_KEEPALIVE ioctl call will only be active when the

  WDIOF_KEEPALIVEPING bit has been set in the option field on the watchdog's

  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.

drivers/watchdog/watchdog_dev.c

+5 −0
Original line number Diff line number Diff line
@@ -120,6 +120,11 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd, 
		return put_user(val, p);

	case WDIOC_GETBOOTSTATUS:

		return put_user(wdd->bootstatus, p);

	case WDIOC_KEEPALIVE:

		if (!(wdd->info->options & WDIOF_KEEPALIVEPING))

			return -EOPNOTSUPP;

		watchdog_ping(wdd);

		return 0;

	default:

		return -ENOTTY;

	}