104 lines
2.3 KiB
C
104 lines
2.3 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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#define pr_fmt(fmt) "watchdog: " fmt
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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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static LIST_HEAD(watchdog_list);
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static const char *watchdog_name(struct watchdog *wd)
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{
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if (wd->dev)
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return dev_name(wd->dev);
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if (wd->name)
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return wd->name;
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return "unknown";
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}
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int watchdog_register(struct watchdog *wd)
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{
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if (!wd->priority)
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wd->priority = WATCHDOG_DEFAULT_PRIORITY;
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list_add_tail(&wd->list, &watchdog_list);
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pr_debug("registering watchdog %s with priority %d\n", watchdog_name(wd),
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wd->priority);
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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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list_del(&wd->list);
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return 0;
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}
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EXPORT_SYMBOL(watchdog_deregister);
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static struct watchdog *watchdog_get_default(void)
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{
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struct watchdog *tmp, *wd = NULL;
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int priority = 0;
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list_for_each_entry(tmp, &watchdog_list, list) {
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if (tmp->priority > priority) {
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priority = tmp->priority;
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wd = tmp;
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}
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}
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return wd;
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}
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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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struct watchdog *wd;
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wd = watchdog_get_default();
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if (!wd)
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return -ENODEV;
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pr_debug("setting timeout on %s to %ds\n", watchdog_name(wd), timeout);
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return wd->set_timeout(wd, timeout);
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}
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EXPORT_SYMBOL(watchdog_set_timeout);
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/**
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* of_get_watchdog_priority() - get the desired watchdog priority from device tree
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* @node: The device_node to read the property from
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*
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* return: The priority
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*/
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unsigned int of_get_watchdog_priority(struct device_node *node)
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{
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unsigned int priority = WATCHDOG_DEFAULT_PRIORITY;
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of_property_read_u32(node, "watchdog-priority", &priority);
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return priority;
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}
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