This patch adds a simple wd command which can setup, trigger and stop a watchdog on the platform. Signed-off-by: Juergen Beisert <jbe@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
58 lines
1.4 KiB
C
58 lines
1.4 KiB
C
/*
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* (c) 2012 Juergen Beisert <kernel@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <command.h>
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#include <errno.h>
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#include <linux/ctype.h>
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#include <watchdog.h>
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/*
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* Note: this simple framework supports one watchdog only.
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*/
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static struct watchdog *watchdog;
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int watchdog_register(struct watchdog *wd)
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{
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if (watchdog != NULL)
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return -EBUSY;
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watchdog = wd;
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return 0;
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}
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EXPORT_SYMBOL(watchdog_register);
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int watchdog_deregister(struct watchdog *wd)
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{
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if (watchdog == NULL || wd != watchdog)
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return -ENODEV;
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watchdog = NULL;
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return 0;
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}
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EXPORT_SYMBOL(watchdog_deregister);
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/*
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* start, stop or retrigger the watchdog
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* timeout in [seconds]. timeout of '0' will disable the watchdog (if possible)
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*/
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int watchdog_set_timeout(unsigned timeout)
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{
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if (watchdog == NULL)
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return -ENODEV;
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return watchdog->set_timeout(watchdog, timeout);
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}
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EXPORT_SYMBOL(watchdog_set_timeout);
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