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/*
* (c) 2012 Juergen Beisert <kernel@pengutronix.de>
*
* 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.
*/
#define pr_fmt(fmt) "watchdog: " fmt
#include <common.h>
#include <command.h>
#include <errno.h>
#include <linux/ctype.h>
#include <watchdog.h>
static LIST_HEAD(watchdog_list);
static const char *watchdog_name(struct watchdog *wd)
{
if (wd->hwdev)
return dev_name(wd->hwdev);
if (wd->name)
return wd->name;
return "unknown";
}
static int watchdog_register_dev(struct watchdog *wd, const char *name, int id)
{
wd->dev.parent = wd->hwdev;
wd->dev.id = id;
strncpy(wd->dev.name, name, MAX_DRIVER_NAME);
return register_device(&wd->dev);
}
int watchdog_register(struct watchdog *wd)
{
struct param_d *p;
const char *alias;
int ret = 0;
alias = of_alias_get(wd->hwdev->device_node);
if (alias)
ret = watchdog_register_dev(wd, alias, DEVICE_ID_SINGLE);
if (!alias || ret)
ret = watchdog_register_dev(wd, "wdog", DEVICE_ID_DYNAMIC);
if (ret)
return ret;
if (!wd->priority)
wd->priority = WATCHDOG_DEFAULT_PRIORITY;
dev_add_param_uint32_ro(&wd->dev, "timeout_max",
&wd->timeout_max, "%u");
list_add_tail(&wd->list, &watchdog_list);
pr_debug("registering watchdog %s with priority %d\n", watchdog_name(wd),
wd->priority);
return 0;
}
EXPORT_SYMBOL(watchdog_register);
int watchdog_deregister(struct watchdog *wd)
{
unregister_device(&wd->dev);
list_del(&wd->list);
return 0;
}
EXPORT_SYMBOL(watchdog_deregister);
static struct watchdog *watchdog_get_default(void)
{
struct watchdog *tmp, *wd = NULL;
int priority = 0;
list_for_each_entry(tmp, &watchdog_list, list) {
if (tmp->priority > priority) {
priority = tmp->priority;
wd = tmp;
}
}
return wd;
}
/*
* start, stop or retrigger the watchdog
* timeout in [seconds]. timeout of '0' will disable the watchdog (if possible)
*/
int watchdog_set_timeout(unsigned timeout)
{
struct watchdog *wd;
wd = watchdog_get_default();
if (!wd)
return -ENODEV;
if (timeout > wd->timeout_max)
return -EINVAL;
pr_debug("setting timeout on %s to %ds\n", watchdog_name(wd), timeout);
return wd->set_timeout(wd, timeout);
}
EXPORT_SYMBOL(watchdog_set_timeout);
/**
* of_get_watchdog_priority() - get the desired watchdog priority from device tree
* @node: The device_node to read the property from
*
* return: The priority
*/
unsigned int of_get_watchdog_priority(struct device_node *node)
{
unsigned int priority = WATCHDOG_DEFAULT_PRIORITY;
of_property_read_u32(node, "watchdog-priority", &priority);
return priority;
}
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