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/*
* Driver for watchdog device controlled through GPIO-line
*
* Author: 2013, Alexander Shiyan <shc_work@mail.ru>
*
* 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.
*/
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/watchdog.h>
#define SOFT_TIMEOUT_MIN 1
#define SOFT_TIMEOUT_DEF 60
#define SOFT_TIMEOUT_MAX 0xffff
enum {
HW_ALGO_TOGGLE,
HW_ALGO_LEVEL,
};
struct gpio_wdt_priv {
int gpio;
bool active_low;
bool state;
bool always_running;
bool armed;
unsigned int hw_algo;
unsigned int hw_margin;
unsigned long last_jiffies;
struct notifier_block notifier;
struct timer_list timer;
struct watchdog_device wdd;
};
static void gpio_wdt_disable(struct gpio_wdt_priv *priv)
{
gpio_set_value_cansleep(priv->gpio, !priv->active_low);
/* Put GPIO back to tristate */
if (priv->hw_algo == HW_ALGO_TOGGLE)
gpio_direction_input(priv->gpio);
}
static void gpio_wdt_hwping(unsigned long data)
{
struct watchdog_device *wdd = (struct watchdog_device *)data;
struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd);
if (priv->armed && time_after(jiffies, priv->last_jiffies +
msecs_to_jiffies(wdd->timeout * 1000))) {
dev_crit(wdd->dev, "Timer expired. System will reboot soon!\n");
return;
}
/* Restart timer */
mod_timer(&priv->timer, jiffies + priv->hw_margin);
switch (priv->hw_algo) {
case HW_ALGO_TOGGLE:
/* Toggle output pin */
priv->state = !priv->state;
gpio_set_value_cansleep(priv->gpio, priv->state);
break;
case HW_ALGO_LEVEL:
/* Pulse */
gpio_set_value_cansleep(priv->gpio, !priv->active_low);
udelay(1);
gpio_set_value_cansleep(priv->gpio, priv->active_low);
break;
}
}
static void gpio_wdt_start_impl(struct gpio_wdt_priv *priv)
{
priv->state = priv->active_low;
gpio_direction_output(priv->gpio, priv->state);
priv->last_jiffies = jiffies;
gpio_wdt_hwping((unsigned long)&priv->wdd);
}
static int gpio_wdt_start(struct watchdog_device *wdd)
{
struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd);
gpio_wdt_start_impl(priv);
priv->armed = true;
return 0;
}
static int gpio_wdt_stop(struct watchdog_device *wdd)
{
struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd);
priv->armed = false;
if (!priv->always_running) {
mod_timer(&priv->timer, 0);
gpio_wdt_disable(priv);
}
return 0;
}
static int gpio_wdt_ping(struct watchdog_device *wdd)
{
struct gpio_wdt_priv *priv = watchdog_get_drvdata(wdd);
priv->last_jiffies = jiffies;
return 0;
}
static int gpio_wdt_set_timeout(struct watchdog_device *wdd, unsigned int t)
{
wdd->timeout = t;
return gpio_wdt_ping(wdd);
}
static int gpio_wdt_notify_sys(struct notifier_block *nb, unsigned long code,
void *unused)
{
struct gpio_wdt_priv *priv = container_of(nb, struct gpio_wdt_priv,
notifier);
mod_timer(&priv->timer, 0);
switch (code) {
case SYS_HALT:
case SYS_POWER_OFF:
gpio_wdt_disable(priv);
break;
default:
break;
}
return NOTIFY_DONE;
}
static const struct watchdog_info gpio_wdt_ident = {
.options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING |
WDIOF_SETTIMEOUT,
.identity = "GPIO Watchdog",
};
static const struct watchdog_ops gpio_wdt_ops = {
.owner = THIS_MODULE,
.start = gpio_wdt_start,
.stop = gpio_wdt_stop,
.ping = gpio_wdt_ping,
.set_timeout = gpio_wdt_set_timeout,
};
static int gpio_wdt_probe(struct platform_device *pdev)
{
struct gpio_wdt_priv *priv;
enum of_gpio_flags flags;
unsigned int hw_margin;
unsigned long f = 0;
const char *algo;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->gpio = of_get_gpio_flags(pdev->dev.of_node, 0, &flags);
if (!gpio_is_valid(priv->gpio))
return priv->gpio;
priv->active_low = flags & OF_GPIO_ACTIVE_LOW;
ret = of_property_read_string(pdev->dev.of_node, "hw_algo", &algo);
if (ret)
return ret;
if (!strcmp(algo, "toggle")) {
priv->hw_algo = HW_ALGO_TOGGLE;
f = GPIOF_IN;
} else if (!strcmp(algo, "level")) {
priv->hw_algo = HW_ALGO_LEVEL;
f = priv->active_low ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW;
} else {
return -EINVAL;
}
ret = devm_gpio_request_one(&pdev->dev, priv->gpio, f,
dev_name(&pdev->dev));
if (ret)
return ret;
ret = of_property_read_u32(pdev->dev.of_node,
"hw_margin_ms", &hw_margin);
if (ret)
return ret;
/* Disallow values lower than 2 and higher than 65535 ms */
if (hw_margin < 2 || hw_margin > 65535)
return -EINVAL;
/* Use safe value (1/2 of real timeout) */
priv->hw_margin = msecs_to_jiffies(hw_margin / 2);
priv->always_running = of_property_read_bool(pdev->dev.of_node,
"always-running");
watchdog_set_drvdata(&priv->wdd, priv);
priv->wdd.info = &gpio_wdt_ident;
priv->wdd.ops = &gpio_wdt_ops;
priv->wdd.min_timeout = SOFT_TIMEOUT_MIN;
priv->wdd.max_timeout = SOFT_TIMEOUT_MAX;
if (watchdog_init_timeout(&priv->wdd, 0, &pdev->dev) < 0)
priv->wdd.timeout = SOFT_TIMEOUT_DEF;
setup_timer(&priv->timer, gpio_wdt_hwping, (unsigned long)&priv->wdd);
ret = watchdog_register_device(&priv->wdd);
if (ret)
return ret;
priv->notifier.notifier_call = gpio_wdt_notify_sys;
ret = register_reboot_notifier(&priv->notifier);
if (ret)
goto error_unregister;
if (priv->always_running)
gpio_wdt_start_impl(priv);
return 0;
error_unregister:
watchdog_unregister_device(&priv->wdd);
return ret;
}
static int gpio_wdt_remove(struct platform_device *pdev)
{
struct gpio_wdt_priv *priv = platform_get_drvdata(pdev);
del_timer_sync(&priv->timer);
unregister_reboot_notifier(&priv->notifier);
watchdog_unregister_device(&priv->wdd);
return 0;
}
static const struct of_device_id gpio_wdt_dt_ids[] = {
{ .compatible = "linux,wdt-gpio", },
{ }
};
MODULE_DEVICE_TABLE(of, gpio_wdt_dt_ids);
static struct platform_driver gpio_wdt_driver = {
.driver = {
.name = "gpio-wdt",
.of_match_table = gpio_wdt_dt_ids,
},
.probe = gpio_wdt_probe,
.remove = gpio_wdt_remove,
};
#ifdef CONFIG_GPIO_WATCHDOG_ARCH_INITCALL
static int __init gpio_wdt_init(void)
{
return platform_driver_register(&gpio_wdt_driver);
}
arch_initcall(gpio_wdt_init);
#else
module_platform_driver(gpio_wdt_driver);
#endif
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("GPIO Watchdog");
MODULE_LICENSE("GPL");
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