Date:	Sun, 17 Nov 2013 20:12:52 +0100
From:	Wim Van Sebroeck <wim@...ana.be>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] watchdog: w83627hf: Convert to watchdog infrastructure

Hi Guenter,

> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> v4: Restore 'nowayout' module parameter
> 
> The changes cause a trivial conflict with 'watchdog: w83627hf: Auto-detect
> IO address and supported chips'. Please let me know if I should re-send
> the entire series.
> 
>  drivers/watchdog/Kconfig        |    1 +
>  drivers/watchdog/w83627hf_wdt.c |  218 +++++++++------------------------------
>  2 files changed, 50 insertions(+), 169 deletions(-)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index d1d53f3..dcaecd0 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -868,6 +868,7 @@ config VIA_WDT
>  config W83627HF_WDT
>  	tristate "W83627HF/W83627DHG Watchdog Timer"
>  	depends on X86
> +	select WATCHDOG_CORE
>  	---help---
>  	  This is the driver for the hardware watchdog on the W83627HF chipset
>  	  as used in Advantech PC-9578 and Tyan S2721-533 motherboards
> diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c
> index 92f1326..e204c2b 100644
> --- a/drivers/watchdog/w83627hf_wdt.c
> +++ b/drivers/watchdog/w83627hf_wdt.c
> @@ -1,6 +1,9 @@
>  /*
>   *	w83627hf/thf WDT driver
>   *
> + *	(c) Copyright 2013 Guenter Roeck
> + *		converted to watchdog infrastructure
> + *
>   *	(c) Copyright 2007 Vlad Drukker <vlad@...rewiz.com>
>   *		added support for W83627THF.
>   *
> @@ -31,31 +34,22 @@
>  #include <linux/module.h>
>  #include <linux/moduleparam.h>
>  #include <linux/types.h>
> -#include <linux/miscdevice.h>
>  #include <linux/watchdog.h>
> -#include <linux/fs.h>
>  #include <linux/ioport.h>
>  #include <linux/notifier.h>
>  #include <linux/reboot.h>
>  #include <linux/init.h>
> -#include <linux/spinlock.h>
>  #include <linux/io.h>
> -#include <linux/uaccess.h>
> -
>  
>  #define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
>  #define WATCHDOG_TIMEOUT 60		/* 60 sec default timeout */
>  
> -static unsigned long wdt_is_open;
> -static char expect_close;
> -static DEFINE_SPINLOCK(io_lock);
> -
>  /* You must set this - there is no sane way to probe for this board. */
>  static int wdt_io = 0x2E;
>  module_param(wdt_io, int, 0);
>  MODULE_PARM_DESC(wdt_io, "w83627hf/thf WDT io port (default 0x2E)");
>  
> -static int timeout = WATCHDOG_TIMEOUT;	/* in seconds */
> +static int timeout;			/* in seconds */
>  module_param(timeout, int, 0);
>  MODULE_PARM_DESC(timeout,
>  		"Watchdog timeout in seconds. 1 <= timeout <= 255, default="
> @@ -110,7 +104,7 @@ static void w83627hf_unselect_wd_register(void)
>  /* tyan motherboards seem to set F5 to 0x4C ?
>   * So explicitly init to appropriate value. */
>  
> -static void w83627hf_init(void)
> +static void w83627hf_init(struct watchdog_device *wdog)
>  {
>  	unsigned char t;
>  
> @@ -120,8 +114,8 @@ static void w83627hf_init(void)
>  	t = inb_p(WDT_EFDR);      /* read CRF6 */
>  	if (t != 0) {
>  		pr_info("Watchdog already running. Resetting timeout to %d sec\n",
> -			timeout);
> -		outb_p(timeout, WDT_EFDR);    /* Write back to CRF6 */
> +			wdog->timeout);
> +		outb_p(wdog->timeout, WDT_EFDR);	/* Write back to CRF6 */
>  	}
>  
>  	outb_p(0xF5, WDT_EFER); /* Select CRF5 */
> @@ -141,10 +135,8 @@ static void w83627hf_init(void)
>  	w83627hf_unselect_wd_register();
>  }
>  
> -static void wdt_set_time(int timeout)
> +static int wdt_set_time(unsigned int timeout)
>  {
> -	spin_lock(&io_lock);
> -
>  	w83627hf_select_wd_register();
>  
>  	outb_p(0xF6, WDT_EFER);    /* Select CRF6 */
> @@ -152,34 +144,30 @@ static void wdt_set_time(int timeout)
>  
>  	w83627hf_unselect_wd_register();
>  
> -	spin_unlock(&io_lock);
> +	return 0;
>  }
>  
> -static int wdt_ping(void)
> +static int wdt_start(struct watchdog_device *wdog)
>  {
> -	wdt_set_time(timeout);
> -	return 0;
> +	return wdt_set_time(wdog->timeout);
>  }
>  
> -static int wdt_disable(void)
> +static int wdt_stop(struct watchdog_device *wdog)
>  {
> -	wdt_set_time(0);
> -	return 0;
> +	return wdt_set_time(0);
>  }
>  
> -static int wdt_set_heartbeat(int t)
> +static int wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout)
>  {
> -	if (t < 1 || t > 255)
> -		return -EINVAL;
> -	timeout = t;
> +	wdt_set_time(timeout);

Since the core code does a "ping()" after calling the wdt_set_timeout operation
you don't need the above line.

> +	wdog->timeout = timeout;
> +
>  	return 0;
>  }
>  
> -static int wdt_get_time(void)
> +static unsigned int wdt_get_time(struct watchdog_device *wdog)
>  {
> -	int timeleft;
> -
> -	spin_lock(&io_lock);
> +	unsigned int timeleft;
>  
>  	w83627hf_select_wd_register();
>  
> @@ -188,124 +176,17 @@ static int wdt_get_time(void)
>  
>  	w83627hf_unselect_wd_register();
>  
> -	spin_unlock(&io_lock);
> -
>  	return timeleft;
>  }
>  
> -static ssize_t wdt_write(struct file *file, const char __user *buf,
> -						size_t count, loff_t *ppos)
> -{
> -	if (count) {
> -		if (!nowayout) {
> -			size_t i;
> -
> -			expect_close = 0;
> -
> -			for (i = 0; i != count; i++) {
> -				char c;
> -				if (get_user(c, buf + i))
> -					return -EFAULT;
> -				if (c == 'V')
> -					expect_close = 42;
> -			}
> -		}
> -		wdt_ping();
> -	}
> -	return count;
> -}
> -
> -static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> -{
> -	void __user *argp = (void __user *)arg;
> -	int __user *p = argp;
> -	int timeval;
> -	static const struct watchdog_info ident = {
> -		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
> -							WDIOF_MAGICCLOSE,
> -		.firmware_version = 1,
> -		.identity = "W83627HF WDT",
> -	};
> -
> -	switch (cmd) {
> -	case WDIOC_GETSUPPORT:
> -		if (copy_to_user(argp, &ident, sizeof(ident)))
> -			return -EFAULT;
> -		break;
> -	case WDIOC_GETSTATUS:
> -	case WDIOC_GETBOOTSTATUS:
> -		return put_user(0, p);
> -	case WDIOC_SETOPTIONS:
> -	{
> -		int options, retval = -EINVAL;
> -
> -		if (get_user(options, p))
> -			return -EFAULT;
> -		if (options & WDIOS_DISABLECARD) {
> -			wdt_disable();
> -			retval = 0;
> -		}
> -		if (options & WDIOS_ENABLECARD) {
> -			wdt_ping();
> -			retval = 0;
> -		}
> -		return retval;
> -	}
> -	case WDIOC_KEEPALIVE:
> -		wdt_ping();
> -		break;
> -	case WDIOC_SETTIMEOUT:
> -		if (get_user(timeval, p))
> -			return -EFAULT;
> -		if (wdt_set_heartbeat(timeval))
> -			return -EINVAL;
> -		wdt_ping();
> -		/* Fall */
> -	case WDIOC_GETTIMEOUT:
> -		return put_user(timeout, p);
> -	case WDIOC_GETTIMELEFT:
> -		timeval = wdt_get_time();
> -		return put_user(timeval, p);
> -	default:
> -		return -ENOTTY;
> -	}
> -	return 0;
> -}
> -
> -static int wdt_open(struct inode *inode, struct file *file)
> -{
> -	if (test_and_set_bit(0, &wdt_is_open))
> -		return -EBUSY;
> -	/*
> -	 *	Activate
> -	 */
> -
> -	wdt_ping();
> -	return nonseekable_open(inode, file);
> -}
> -
> -static int wdt_close(struct inode *inode, struct file *file)
> -{
> -	if (expect_close == 42)
> -		wdt_disable();
> -	else {
> -		pr_crit("Unexpected close, not stopping watchdog!\n");
> -		wdt_ping();
> -	}
> -	expect_close = 0;
> -	clear_bit(0, &wdt_is_open);
> -	return 0;
> -}
> -
>  /*
>   *	Notifier for system down
>   */
> -
>  static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
>  	void *unused)
>  {
>  	if (code == SYS_DOWN || code == SYS_HALT)
> -		wdt_disable();	/* Turn the WDT off */
> +		wdt_set_time(0);	/* Turn the WDT off */
>  
>  	return NOTIFY_DONE;
>  }
> @@ -314,19 +195,26 @@ static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
>   *	Kernel Interfaces
>   */
>  
> -static const struct file_operations wdt_fops = {
> -	.owner		= THIS_MODULE,
> -	.llseek		= no_llseek,
> -	.write		= wdt_write,
> -	.unlocked_ioctl	= wdt_ioctl,
> -	.open		= wdt_open,
> -	.release	= wdt_close,
> +static struct watchdog_info wdt_info = {
> +	.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
> +	.identity = "W83627HF Watchdog",
> +};
> +
> +static struct watchdog_ops wdt_ops = {
> +	.owner = THIS_MODULE,
> +	.start = wdt_start,
> +	.stop = wdt_stop,
> +	.ping = wdt_start,

This one is not needed since it's the same as start.

> +	.set_timeout = wdt_set_timeout,
> +	.get_timeleft = wdt_get_time,
>  };
>  
> -static struct miscdevice wdt_miscdev = {
> -	.minor = WATCHDOG_MINOR,
> -	.name = "watchdog",
> -	.fops = &wdt_fops,
> +static struct watchdog_device wdt_dev = {
> +	.info = &wdt_info,
> +	.ops = &wdt_ops,
> +	.timeout = WATCHDOG_TIMEOUT,
> +	.min_timeout = 1,
> +	.max_timeout = 255,
>  };
>  
>  /*
> @@ -344,19 +232,15 @@ static int __init wdt_init(void)
>  
>  	pr_info("WDT driver for the Winbond(TM) W83627HF/THF/HG/DHG Super I/O chip initialising\n");
>  
> -	if (wdt_set_heartbeat(timeout)) {
> -		wdt_set_heartbeat(WATCHDOG_TIMEOUT);
> -		pr_info("timeout value must be 1 <= timeout <= 255, using %d\n",
> -			WATCHDOG_TIMEOUT);
> -	}
> -
>  	if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
>  		pr_err("I/O address 0x%04x already in use\n", wdt_io);
> -		ret = -EIO;
> -		goto out;
> +		return -EIO;
>  	}
>  
> -	w83627hf_init();
> +	watchdog_init_timeout(&wdt_dev, timeout, NULL);
> +	watchdog_set_nowayout(&wdt_dev, nowayout);
> +
> +	w83627hf_init(&wdt_dev);
>  
>  	ret = register_reboot_notifier(&wdt_notifier);
>  	if (ret != 0) {
> @@ -364,28 +248,25 @@ static int __init wdt_init(void)
>  		goto unreg_regions;
>  	}
>  
> -	ret = misc_register(&wdt_miscdev);
> -	if (ret != 0) {
> -		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
> -		       WATCHDOG_MINOR, ret);
> +	ret = watchdog_register_device(&wdt_dev);
> +	if (ret)
>  		goto unreg_reboot;
> -	}
>  
>  	pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
> -		timeout, nowayout);
> +		wdt_dev.timeout, nowayout);
>  
> -out:
>  	return ret;
> +
>  unreg_reboot:
>  	unregister_reboot_notifier(&wdt_notifier);
>  unreg_regions:
>  	release_region(wdt_io, 1);
> -	goto out;
> +	return ret;
>  }
>  
>  static void __exit wdt_exit(void)
>  {
> -	misc_deregister(&wdt_miscdev);
> +	watchdog_unregister_device(&wdt_dev);
>  	unregister_reboot_notifier(&wdt_notifier);
>  	release_region(wdt_io, 1);
>  }
> @@ -396,4 +277,3 @@ module_exit(wdt_exit);
>  MODULE_LICENSE("GPL");
>  MODULE_AUTHOR("Pádraig  Brady <P@...igBrady.com>");
>  MODULE_DESCRIPTION("w83627hf/thf WDT driver");
> -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

I will add this patch with above two small corrections to linux-watchdog-next.

Kind regards,
Wim.

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