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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";
}
/*
* start, stop or retrigger the watchdog
* timeout in [seconds]. timeout of '0' will disable the watchdog (if possible)
*/
int watchdog_set_timeout(struct watchdog *wd, unsigned timeout)
{
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);
static int watchdog_set_priority(struct param_d *param, void *priv)
{
struct watchdog *wd = priv;
if (wd->priority == 0)
return watchdog_set_timeout(wd, 0);
return 0;
}
static int watchdog_set_cur(struct param_d *param, void *priv)
{
struct watchdog *wd = priv;
if (wd->poller_timeout_cur > wd->timeout_max)
return -EINVAL;
return 0;
}
static void watchdog_poller_cb(void *priv);
static void watchdog_poller_start(struct watchdog *wd)
{
watchdog_set_timeout(wd, wd->poller_timeout_cur);
poller_call_async(&wd->poller, 500 * MSECOND,
watchdog_poller_cb, wd);
}
static void watchdog_poller_cb(void *priv)
{
struct watchdog *wd = priv;
if (wd->poller_enable)
watchdog_poller_start(wd);
}
static int watchdog_set_poller(struct param_d *param, void *priv)
{
struct watchdog *wd = priv;
if (wd->poller_enable) {
dev_info(&wd->dev, "enable watchdog poller\n");
watchdog_poller_start(wd);
} else {
dev_info(&wd->dev, "disable watchdog poller\n");
poller_async_cancel(&wd->poller);
}
return 0;
}
static int watchdog_register_poller(struct watchdog *wd)
{
struct param_d *p;
int ret;
ret = poller_async_register(&wd->poller);
if (ret)
return ret;
p = dev_add_param_bool(&wd->dev, "autoping", watchdog_set_poller,
NULL, &wd->poller_enable, wd);
return PTR_ERR_OR_ZERO(p);
}
static int watchdog_register_dev(struct watchdog *wd, const char *name, int id)
{
wd->dev.parent = wd->hwdev;
wd->dev.id = id;
dev_set_name(&wd->dev, name);
return register_device(&wd->dev);
}
int watchdog_register(struct watchdog *wd)
{
struct param_d *p;
const char *alias = NULL;
int ret = 0;
if (wd->hwdev)
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;
p = dev_add_param_uint32(&wd->dev, "priority",
watchdog_set_priority, NULL,
&wd->priority, "%u", wd);
if (IS_ERR(p))
return PTR_ERR(p);
/* set some default sane value */
if (!wd->timeout_max)
wd->timeout_max = 60 * 60 * 24;
p = dev_add_param_uint32_ro(&wd->dev, "timeout_max",
&wd->timeout_max, "%u");
if (IS_ERR(p))
return PTR_ERR(p);
if (IS_ENABLED(CONFIG_WATCHDOG_POLLER)) {
if (!wd->poller_timeout_cur ||
wd->poller_timeout_cur > wd->timeout_max)
wd->poller_timeout_cur = wd->timeout_max;
p = dev_add_param_uint32(&wd->dev, "timeout_cur", watchdog_set_cur,
NULL, &wd->poller_timeout_cur, "%u", wd);
if (IS_ERR(p))
return PTR_ERR(p);
ret = watchdog_register_poller(wd);
if (ret)
return ret;
}
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)
{
if (IS_ENABLED(CONFIG_WATCHDOG_POLLER)) {
poller_async_cancel(&wd->poller);
poller_async_unregister(&wd->poller);
}
unregister_device(&wd->dev);
list_del(&wd->list);
return 0;
}
EXPORT_SYMBOL(watchdog_deregister);
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;
}
EXPORT_SYMBOL(watchdog_get_default);
struct watchdog *watchdog_get_by_name(const char *name)
{
struct watchdog *tmp;
struct device_d *dev = get_device_by_name(name);
if (!dev)
return NULL;
list_for_each_entry(tmp, &watchdog_list, list) {
if (dev == tmp->hwdev || dev == &tmp->dev)
return tmp;
}
return NULL;
}
EXPORT_SYMBOL(watchdog_get_by_name);
/**
* 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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