Message-Id: <20200611191750.28096-8-a.fatoum@pengutronix.de>
Date:   Thu, 11 Jun 2020 21:17:48 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-watchdog@...r.kernel.org, kernel@...gutronix.de,
        Ahmad Fatoum <a.fatoum@...gutronix.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1 7/8] watchdog: f71808e_wdt: migrate to new kernel watchdog API

Migrating the driver lets us drop the watchdog misc device boilerplate
and reduce size by 270~ lines. It also brings us support for new
functionality like CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED.

This changes behavior on module unloading: Whereas before, the watchdog
was automatically stopped on module unload, now explicit stopping of
the watchdog before unload is required.

Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
---
 drivers/watchdog/Kconfig       |   1 +
 drivers/watchdog/f71808e_wdt.c | 497 ++++++++-------------------------
 2 files changed, 111 insertions(+), 387 deletions(-)

diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
index 0663c604bd64..c312dd5fc0ca 100644
--- a/drivers/watchdog/Kconfig
+++ b/drivers/watchdog/Kconfig
@@ -1052,6 +1052,7 @@ config EBC_C384_WDT
 config F71808E_WDT
 	tristate "Fintek F718xx, F818xx Super I/O Watchdog"
 	depends on X86
+	select WATCHDOG_CORE
 	help
 	  This is the driver for the hardware watchdog on the Fintek F71808E,
 	  F71862FG, F71868, F71869, F71882FG, F71889FG, F81803, F81865, and
diff --git a/drivers/watchdog/f71808e_wdt.c b/drivers/watchdog/f71808e_wdt.c
index 9299ad4d4a52..7c42cbf9912e 100644
--- a/drivers/watchdog/f71808e_wdt.c
+++ b/drivers/watchdog/f71808e_wdt.c
@@ -9,16 +9,10 @@
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/err.h>
-#include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
-#include <linux/miscdevice.h>
 #include <linux/module.h>
-#include <linux/mutex.h>
-#include <linux/notifier.h>
-#include <linux/reboot.h>
-#include <linux/uaccess.h>
 #include <linux/watchdog.h>
 
 #define DRVNAME "f71808e_wdt"
@@ -129,23 +123,15 @@ struct f71808e_variant {
 };
 
 struct watchdog_data {
+	struct watchdog_device wdd;
 	unsigned short	sioaddr;
 	const struct f71808e_variant *variant;
-	unsigned long	opened;
-	struct mutex	lock;
-	char		expect_close;
 	struct watchdog_info ident;
 
-	unsigned short	timeout;
 	u8		timer_val;	/* content for the wd_time register */
 	char		minutes_mode;
 	u8		pulse_val;	/* pulse width flag */
 	char		pulse_mode;	/* enable pulse output mode? */
-	char		caused_reboot;	/* last reboot was by the watchdog */
-};
-
-static struct watchdog_data watchdog = {
-	.lock = __MUTEX_INITIALIZER(watchdog.lock),
 };
 
 static inline bool has_f81865_wdo_conf(struct watchdog_data *wd)
@@ -216,487 +202,225 @@ static inline void superio_exit(int base)
 	release_region(base, 2);
 }
 
-static int watchdog_set_timeout(int timeout)
+static int watchdog_set_timeout(struct watchdog_device *wdd, unsigned int new_timeout)
 {
-	if (timeout <= 0
-	 || timeout >  max_timeout) {
-		pr_err("watchdog timeout out of range\n");
-		return -EINVAL;
-	}
+	struct watchdog_data *wd = watchdog_get_drvdata(wdd);
 
-	mutex_lock(&watchdog.lock);
-
-	watchdog.timeout = timeout;
-	if (timeout > 0xff) {
-		watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
-		watchdog.minutes_mode = true;
+	wdd->timeout = new_timeout;
+	if (new_timeout > 0xff) {
+		wd->timer_val = DIV_ROUND_UP(new_timeout, 60);
+		wd->minutes_mode = true;
 	} else {
-		watchdog.timer_val = timeout;
-		watchdog.minutes_mode = false;
+		wd->timer_val = new_timeout;
+		wd->minutes_mode = false;
 	}
 
-	mutex_unlock(&watchdog.lock);
-
 	return 0;
 }
 
-static int watchdog_set_pulse_width(unsigned int pw)
+static int watchdog_set_pulse_width(struct watchdog_data *wd, unsigned int pw)
 {
-	int err = 0;
 	unsigned int t1 = 25, t2 = 125, t3 = 5000;
 
-	if (watchdog.variant->id == SIO_F71868_ID) {
+	if (wd->variant->id == SIO_F71868_ID) {
 		t1 = 30;
 		t2 = 150;
 		t3 = 6000;
 	}
 
-	mutex_lock(&watchdog.lock);
-
 	if        (pw <=  1) {
-		watchdog.pulse_val = 0;
+		wd->pulse_val = 0;
 	} else if (pw <= t1) {
-		watchdog.pulse_val = 1;
+		wd->pulse_val = 1;
 	} else if (pw <= t2) {
-		watchdog.pulse_val = 2;
+		wd->pulse_val = 2;
 	} else if (pw <= t3) {
-		watchdog.pulse_val = 3;
+		wd->pulse_val = 3;
 	} else {
 		pr_err("pulse width out of range\n");
-		err = -EINVAL;
-		goto exit_unlock;
+		return -EINVAL;
 	}
 
-	watchdog.pulse_mode = pw;
+	wd->pulse_mode = pw;
 
-exit_unlock:
-	mutex_unlock(&watchdog.lock);
-	return err;
+	return 0;
 }
 
-static int watchdog_keepalive(void)
+static int watchdog_keepalive(struct watchdog_device *wdd)
 {
-	int err = 0;
+	struct watchdog_data *wd = watchdog_get_drvdata(wdd);
+	int err;
 
-	mutex_lock(&watchdog.lock);
-	err = superio_enter(watchdog.sioaddr);
+	err = superio_enter(wd->sioaddr);
 	if (err)
-		goto exit_unlock;
-	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+		return err;
+	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
 
-	if (watchdog.minutes_mode)
+	if (wd->minutes_mode)
 		/* select minutes for timer units */
-		superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
+		superio_set_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
 				F71808FG_FLAG_WD_UNIT);
 	else
 		/* select seconds for timer units */
-		superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
+		superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
 				F71808FG_FLAG_WD_UNIT);
 
 	/* Set timer value */
-	superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
-			   watchdog.timer_val);
+	superio_outb(wd->sioaddr, F71808FG_REG_WD_TIME,
+		     wd->timer_val);
 
-	superio_exit(watchdog.sioaddr);
+	superio_exit(wd->sioaddr);
 
-exit_unlock:
-	mutex_unlock(&watchdog.lock);
-	return err;
+	return 0;
 }
 
-static int watchdog_start(void)
+static int watchdog_start(struct watchdog_device *wdd)
 {
+	struct watchdog_data *wd = watchdog_get_drvdata(wdd);
 	int err;
 
 	/* Make sure we don't die as soon as the watchdog is enabled below */
-	err = watchdog_keepalive();
+	err = watchdog_keepalive(wdd);
 	if (err)
 		return err;
 
-	mutex_lock(&watchdog.lock);
-	err = superio_enter(watchdog.sioaddr);
+	err = superio_enter(wd->sioaddr);
 	if (err)
-		goto exit_unlock;
-	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+		return err;
+	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
 
 	/* Watchdog pin configuration */
-	watchdog.variant->pinconf(&watchdog);
+	wd->variant->pinconf(wd);
 
-	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
-	superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
+	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
+	superio_set_bit(wd->sioaddr, SIO_REG_ENABLE, 0);
 
-	if (has_f81865_wdo_conf(&watchdog))
-		superio_set_bit(watchdog.sioaddr, F81865_REG_WDO_CONF,
+	if (has_f81865_wdo_conf(wd))
+		superio_set_bit(wd->sioaddr, F81865_REG_WDO_CONF,
 				F81865_FLAG_WDOUT_EN);
 	else
-		superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
+		superio_set_bit(wd->sioaddr, F71808FG_REG_WDO_CONF,
 				F71808FG_FLAG_WDOUT_EN);
 
-	superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
+	superio_set_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
 			F71808FG_FLAG_WD_EN);
 
-	if (watchdog.pulse_mode) {
+	set_bit(WDOG_HW_RUNNING, &wdd->status);
+
+	if (wd->pulse_mode) {
 		/* Select "pulse" output mode with given duration */
-		u8 wdt_conf = superio_inb(watchdog.sioaddr,
-				F71808FG_REG_WDT_CONF);
+		u8 wdt_conf = superio_inb(wd->sioaddr, F71808FG_REG_WDT_CONF);
 
 		/* Set WD_PSWIDTH bits (1:0) */
-		wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
+		wdt_conf = (wdt_conf & 0xfc) | (wd->pulse_val & 0x03);
 		/* Set WD_PULSE to "pulse" mode */
 		wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
 
-		superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
-				wdt_conf);
+		superio_outb(wd->sioaddr, F71808FG_REG_WDT_CONF, wdt_conf);
 	} else {
 		/* Select "level" output mode */
-		superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
-				F71808FG_FLAG_WD_PULSE);
+		superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
+				  F71808FG_FLAG_WD_PULSE);
 	}
 
-	superio_exit(watchdog.sioaddr);
-exit_unlock:
-	mutex_unlock(&watchdog.lock);
+	superio_exit(wd->sioaddr);
 
 	return err;
 }
 
-static int watchdog_stop(void)
-{
-	int err = 0;
-
-	mutex_lock(&watchdog.lock);
-	err = superio_enter(watchdog.sioaddr);
-	if (err)
-		goto exit_unlock;
-	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
-
-	superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
-			F71808FG_FLAG_WD_EN);
-
-	superio_exit(watchdog.sioaddr);
-
-exit_unlock:
-	mutex_unlock(&watchdog.lock);
-
-	return err;
-}
-
-static int watchdog_get_status(void)
-{
-	int status = 0;
-
-	mutex_lock(&watchdog.lock);
-	status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
-	mutex_unlock(&watchdog.lock);
-
-	return status;
-}
-
-static bool watchdog_is_running(void)
-{
-	/*
-	 * if we fail to determine the watchdog's status assume it to be
-	 * running to be on the safe side
-	 */
-	bool is_running = true;
-
-	mutex_lock(&watchdog.lock);
-	if (superio_enter(watchdog.sioaddr))
-		goto exit_unlock;
-	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
-
-	is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
-		&& (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
-			& BIT(F71808FG_FLAG_WD_EN));
-
-	superio_exit(watchdog.sioaddr);
-
-exit_unlock:
-	mutex_unlock(&watchdog.lock);
-	return is_running;
-}
-
-/* /dev/watchdog api */
-
-static int watchdog_open(struct inode *inode, struct file *file)
+static int watchdog_stop(struct watchdog_device *wdd)
 {
+	struct watchdog_data *wd = watchdog_get_drvdata(wdd);
 	int err;
 
-	/* If the watchdog is alive we don't need to start it again */
-	if (test_and_set_bit(0, &watchdog.opened))
-		return -EBUSY;
-
-	err = watchdog_start();
-	if (err) {
-		clear_bit(0, &watchdog.opened);
+	err = superio_enter(wd->sioaddr);
+	if (err)
 		return err;
-	}
+	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
 
-	if (nowayout)
-		__module_get(THIS_MODULE);
+	superio_clear_bit(wd->sioaddr, F71808FG_REG_WDT_CONF,
+			  F71808FG_FLAG_WD_EN);
 
-	watchdog.expect_close = 0;
-	return stream_open(inode, file);
-}
-
-static int watchdog_release(struct inode *inode, struct file *file)
-{
-	clear_bit(0, &watchdog.opened);
+	superio_exit(wd->sioaddr);
 
-	if (!watchdog.expect_close) {
-		watchdog_keepalive();
-		pr_crit("Unexpected close, not stopping watchdog!\n");
-	} else if (!nowayout) {
-		watchdog_stop();
-	}
 	return 0;
 }
 
-/*
- *      watchdog_write:
- *      @file: file handle to the watchdog
- *      @buf: buffer to write
- *      @count: count of bytes
- *      @ppos: pointer to the position to write. No seeks allowed
- *
- *      A write to a watchdog device is defined as a keepalive signal. Any
- *      write of data will do, as we we don't define content meaning.
- */
-
-static ssize_t watchdog_write(struct file *file, const char __user *buf,
-			    size_t count, loff_t *ppos)
-{
-	if (count) {
-		if (!nowayout) {
-			size_t i;
-
-			/* In case it was set long ago */
-			bool expect_close = false;
-
-			for (i = 0; i != count; i++) {
-				char c;
-				if (get_user(c, buf + i))
-					return -EFAULT;
-				if (c == 'V')
-					expect_close = true;
-			}
-
-			/* Properly order writes across fork()ed processes */
-			mutex_lock(&watchdog.lock);
-			watchdog.expect_close = expect_close;
-			mutex_unlock(&watchdog.lock);
-		}
-
-		/* someone wrote to us, we should restart timer */
-		watchdog_keepalive();
-	}
-	return count;
-}
-
-/*
- *      watchdog_ioctl:
- *      @inode: inode of the device
- *      @file: file handle to the device
- *      @cmd: watchdog command
- *      @arg: argument pointer
- *
- *      The watchdog API defines a common set of functions for all watchdogs
- *      according to their available features.
- */
-static long watchdog_ioctl(struct file *file, unsigned int cmd,
-	unsigned long arg)
-{
-	int status;
-	int new_options;
-	int new_timeout;
-	union {
-		struct watchdog_info __user *ident;
-		int __user *i;
-	} uarg;
-
-	uarg.i = (int __user *)arg;
-
-	switch (cmd) {
-	case WDIOC_GETSUPPORT:
-		return copy_to_user(uarg.ident, &watchdog.ident,
-			sizeof(watchdog.ident)) ? -EFAULT : 0;
-
-	case WDIOC_GETSTATUS:
-		status = watchdog_get_status();
-		if (status < 0)
-			return status;
-		return put_user(status, uarg.i);
-
-	case WDIOC_GETBOOTSTATUS:
-		return put_user(0, uarg.i);
-
-	case WDIOC_SETOPTIONS:
-		if (get_user(new_options, uarg.i))
-			return -EFAULT;
-
-		if (new_options & WDIOS_DISABLECARD)
-			watchdog_stop();
-
-		if (new_options & WDIOS_ENABLECARD)
-			return watchdog_start();
-		/* fall through */
-
-	case WDIOC_KEEPALIVE:
-		watchdog_keepalive();
-		return 0;
-
-	case WDIOC_SETTIMEOUT:
-		if (get_user(new_timeout, uarg.i))
-			return -EFAULT;
-
-		if (watchdog_set_timeout(new_timeout))
-			return -EINVAL;
-
-		watchdog_keepalive();
-		/* fall through */
-
-	case WDIOC_GETTIMEOUT:
-		return put_user(watchdog.timeout, uarg.i);
-
-	default:
-		return -ENOTTY;
-
-	}
-}
+static const struct watchdog_ops f71808e_wdog_ops = {
+	.owner = THIS_MODULE,
+	.start = watchdog_start,
+	.stop = watchdog_stop,
+	.ping = watchdog_keepalive,
+	.set_timeout = watchdog_set_timeout,
+};
 
-static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
-	void *unused)
+static bool watchdog_is_running(struct watchdog_data *wd, u8 wdt_conf)
 {
-	if (code == SYS_DOWN || code == SYS_HALT)
-		watchdog_stop();
-	return NOTIFY_DONE;
+	return (superio_inb(wd->sioaddr, SIO_REG_ENABLE) & BIT(0))
+		&& (wdt_conf & BIT(F71808FG_FLAG_WD_EN));
 }
 
-static const struct file_operations watchdog_fops = {
-	.owner		= THIS_MODULE,
-	.llseek		= no_llseek,
-	.open		= watchdog_open,
-	.release	= watchdog_release,
-	.write		= watchdog_write,
-	.unlocked_ioctl	= watchdog_ioctl,
-	.compat_ioctl	= compat_ptr_ioctl,
-};
-
-static struct miscdevice watchdog_miscdev = {
-	.minor		= WATCHDOG_MINOR,
-	.name		= "watchdog",
-	.fops		= &watchdog_fops,
-};
-
-static struct notifier_block watchdog_notifier = {
-	.notifier_call = watchdog_notify_sys,
-};
-
-static int __init watchdog_init(int sioaddr)
+static int __init watchdog_init(struct watchdog_data *wd)
 {
+	struct watchdog_device *wdd = &wd->wdd;
 	int wdt_conf, err = 0;
 
 	/* No need to lock watchdog.lock here because no entry points
 	 * into the module have been registered yet.
 	 */
-	watchdog.sioaddr = sioaddr;
-	watchdog.ident.options = WDIOF_MAGICCLOSE
+	wd->ident.options = WDIOF_SETTIMEOUT
+				| WDIOF_MAGICCLOSE
 				| WDIOF_KEEPALIVEPING
 				| WDIOF_CARDRESET;
 
-	snprintf(watchdog.ident.identity,
-		sizeof(watchdog.ident.identity), "%s watchdog",
-		watchdog.variant->wdt_name);
+	snprintf(wd->ident.identity, sizeof(wd->ident.identity),
+		 "%s watchdog", wd->variant->wdt_name);
 
-	err = superio_enter(sioaddr);
+	err = superio_enter(wd->sioaddr);
 	if (err)
 		return err;
-	superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
+	superio_select(wd->sioaddr, SIO_F71808FG_LD_WDT);
 
-	wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
-	watchdog.caused_reboot = wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS);
+	wdt_conf = superio_inb(wd->sioaddr, F71808FG_REG_WDT_CONF);
 
 	/*
 	 * We don't want WDTMOUT_STS to stick around till regular reboot.
 	 * Write 1 to the bit to clear it to zero.
 	 */
-	superio_outb(sioaddr, F71808FG_REG_WDT_CONF,
+	superio_outb(wd->sioaddr, F71808FG_REG_WDT_CONF,
 		     wdt_conf | BIT(F71808FG_FLAG_WDTMOUT_STS));
 
-	superio_exit(sioaddr);
+	if (watchdog_is_running(wd, wdt_conf))
+		set_bit(WDOG_HW_RUNNING, &wdd->status);
 
-	err = watchdog_set_timeout(timeout);
-	if (err)
-		return err;
-	err = watchdog_set_pulse_width(pulse_width);
-	if (err)
-		return err;
+	superio_exit(wd->sioaddr);
 
-	err = register_reboot_notifier(&watchdog_notifier);
+	err = watchdog_set_pulse_width(wd, pulse_width);
 	if (err)
 		return err;
 
-	err = misc_register(&watchdog_miscdev);
-	if (err) {
-		pr_err("cannot register miscdev on minor=%d\n",
-		       watchdog_miscdev.minor);
-		goto exit_reboot;
-	}
-
-	if (start_withtimeout) {
-		if (start_withtimeout <= 0
-		 || start_withtimeout >  max_timeout) {
-			pr_err("starting timeout out of range\n");
-			err = -EINVAL;
-			goto exit_miscdev;
-		}
-
-		err = watchdog_start();
-		if (err) {
-			pr_err("cannot start watchdog timer\n");
-			goto exit_miscdev;
-		}
-
-		mutex_lock(&watchdog.lock);
-		err = superio_enter(sioaddr);
-		if (err)
-			goto exit_unlock;
-		superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
-
-		if (start_withtimeout > 0xff) {
-			/* select minutes for timer units */
-			superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
-				F71808FG_FLAG_WD_UNIT);
-			superio_outb(sioaddr, F71808FG_REG_WD_TIME,
-				DIV_ROUND_UP(start_withtimeout, 60));
-		} else {
-			/* select seconds for timer units */
-			superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
-				F71808FG_FLAG_WD_UNIT);
-			superio_outb(sioaddr, F71808FG_REG_WD_TIME,
-				start_withtimeout);
-		}
-
-		superio_exit(sioaddr);
-		mutex_unlock(&watchdog.lock);
-
-		if (nowayout)
-			__module_get(THIS_MODULE);
+	wdd->info		= &wd->ident;
+	wdd->ops		= &f71808e_wdog_ops;
+	wdd->min_timeout	= 1;
+	wdd->max_timeout	= max_timeout;
+	wdd->timeout		= timeout;
 
-		pr_info("watchdog started with initial timeout of %u sec\n",
-			start_withtimeout);
-	}
+	watchdog_set_nowayout(wdd, nowayout);
+	watchdog_stop_on_unregister(wdd);
+	watchdog_stop_on_reboot(wdd);
+	watchdog_init_timeout(wdd, start_withtimeout, NULL);
+	watchdog_set_drvdata(wdd, wd);
 
-	return 0;
+	if (wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS))
+		wdd->bootstatus	= WDIOF_CARDRESET;
 
-exit_unlock:
-	mutex_unlock(&watchdog.lock);
-exit_miscdev:
-	misc_deregister(&watchdog_miscdev);
-exit_reboot:
-	unregister_reboot_notifier(&watchdog_notifier);
+	/*
+	 * WATCHDOG_HANDLE_BOOT_ENABLED can result in keepalive being directly
+	 * called without a set_timeout before, so it needs to be done here once
+	 */
+	watchdog_set_timeout(wdd, wdd->timeout);
 
-	return err;
+	return watchdog_register_device(wdd);
 }
 
 static void f71808fg_pinconf(struct watchdog_data *wd)
@@ -812,8 +536,11 @@ static struct f71808e_variant __init *f71808e_find(int sioaddr)
 	return variant;
 }
 
+static struct watchdog_data watchdog;
+
 static int __init f71808e_init(void)
 {
+	struct watchdog_data *wd = &watchdog;
 	static const unsigned short addrs[] = { 0x2e, 0x4e };
 	struct f71808e_variant *variant;
 	int i;
@@ -831,19 +558,15 @@ static int __init f71808e_init(void)
 	if (i == ARRAY_SIZE(addrs))
 		return PTR_ERR(variant);
 
-	watchdog.variant = variant;
+	wd->variant = variant;
+	wd->sioaddr = addrs[i];
 
-	return watchdog_init(addrs[i]);
+	return watchdog_init(wd);
 }
 
 static void __exit f71808e_exit(void)
 {
-	if (watchdog_is_running()) {
-		pr_warn("Watchdog timer still running, stopping it\n");
-		watchdog_stop();
-	}
-	misc_deregister(&watchdog_miscdev);
-	unregister_reboot_notifier(&watchdog_notifier);
+	watchdog_unregister_device(&watchdog.wdd);
 }
 
 MODULE_DESCRIPTION("F71808E Watchdog Driver");
-- 
2.27.0

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