From 2928591eab21eb6bf4a085f5f19bf87c21ee7866 Mon Sep 17 00:00:00 2001 From: Juergen Beisert Date: Wed, 27 Jun 2012 16:30:41 +0200 Subject: Add a simple watchdog framework This patch adds a simple wd command which can setup, trigger and stop a watchdog on the platform. Signed-off-by: Juergen Beisert Signed-off-by: Sascha Hauer --- drivers/watchdog/Kconfig | 9 ++++++++ drivers/watchdog/Makefile | 1 + drivers/watchdog/wd_core.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 67 insertions(+) create mode 100644 drivers/watchdog/Kconfig create mode 100644 drivers/watchdog/Makefile create mode 100644 drivers/watchdog/wd_core.c (limited to 'drivers/watchdog') diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig new file mode 100644 index 0000000000..c734dfe282 --- /dev/null +++ b/drivers/watchdog/Kconfig @@ -0,0 +1,9 @@ +menuconfig WATCHDOG + bool "Watchdog support " + help + Many platforms support a watchdog to keep track of a working machine. + This framework provides routines to handle these watchdogs. + +if WATCHDOG + +endif diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile new file mode 100644 index 0000000000..630f1b6ca2 --- /dev/null +++ b/drivers/watchdog/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_WATCHDOG) += wd_core.o diff --git a/drivers/watchdog/wd_core.c b/drivers/watchdog/wd_core.c new file mode 100644 index 0000000000..3d0cfc635d --- /dev/null +++ b/drivers/watchdog/wd_core.c @@ -0,0 +1,57 @@ +/* + * (c) 2012 Juergen Beisert + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include +#include +#include +#include +#include + +/* + * Note: this simple framework supports one watchdog only. + */ +static struct watchdog *watchdog; + +int watchdog_register(struct watchdog *wd) +{ + if (watchdog != NULL) + return -EBUSY; + + watchdog = wd; + return 0; +} +EXPORT_SYMBOL(watchdog_register); + +int watchdog_deregister(struct watchdog *wd) +{ + if (watchdog == NULL || wd != watchdog) + return -ENODEV; + + watchdog = NULL; + return 0; +} +EXPORT_SYMBOL(watchdog_deregister); + +/* + * start, stop or retrigger the watchdog + * timeout in [seconds]. timeout of '0' will disable the watchdog (if possible) + */ +int watchdog_set_timeout(unsigned timeout) +{ + if (watchdog == NULL) + return -ENODEV; + + return watchdog->set_timeout(watchdog, timeout); +} +EXPORT_SYMBOL(watchdog_set_timeout); -- cgit v1.2.3