linux-kernel - Re: [RFC] [PATCH 3/10] Generic Watchdog Timer Driver

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Message-ID: <4D657F24.2000402@google.com>
Date:	Wed, 23 Feb 2011 13:41:56 -0800
From:	Mike Waychison <mikew@...gle.com>
To:	Wim Van Sebroeck <wim@...ana.be>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Linux Watchdog Mailing List <linux-watchdog@...r.kernel.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [RFC] [PATCH 3/10] Generic Watchdog Timer Driver

On 02/23/11 12:42, Wim Van Sebroeck wrote:
> commit 87af8029a114af16d696047167d482624a1c9334
> Author: Wim Van Sebroeck<wim@...ana.be>
> Date:   Fri Jun 18 09:03:14 2010 +0000
>
>      watchdog: WatchDog Timer Driver Core - Part 3
>
>      This part add's the WDIOC_KEEPALIVE ioctl functionality to the
>      WatchDog Timer Driver Core framework. Please note that the
>      WDIOF_KEEPALIVEPING bit has to be set in the watchdog_info
>      options field.
>
>      Signed-off-by: Alan Cox<alan@...rguk.ukuu.org.uk>
>      Signed-off-by: Wim Van Sebroeck<wim@...ana.be>
>
> diff --git a/Documentation/watchdog/src/watchdog-with-timer-example.c b/Documentation/watchdog/src/watchdog-with-timer-example.c
> index ed7852a..d64cac6 100644
> --- a/Documentation/watchdog/src/watchdog-with-timer-example.c
> +++ b/Documentation/watchdog/src/watchdog-with-timer-example.c
> @@ -117,6 +117,7 @@ static int wdt_stop(struct watchdog_device *wdd)
>    */
>   static const struct watchdog_info wdt_info = {
>   	.identity =	DRV_NAME,
> +	.options =	WDIOF_KEEPALIVEPING,
>   };
>
>   static const struct watchdog_ops wdt_ops = {
> diff --git a/Documentation/watchdog/watchdog-kernel-api.txt b/Documentation/watchdog/watchdog-kernel-api.txt
> index 9418d4c..4a68e5e 100644
> --- a/Documentation/watchdog/watchdog-kernel-api.txt
> +++ b/Documentation/watchdog/watchdog-kernel-api.txt
> @@ -96,6 +96,9 @@ they are supported. These optional routines/operations are:
>     the watchdog timer driver core does: to send a keepalive ping to the watchdog
>     timer hardware it will either use the ping operation (when available) or the
>     start operation (when the ping operation is not available).
> +  (Note: the WDIOC_KEEPALIVE ioctl call will only be active when the
> +  WDIOF_KEEPALIVEPING bit has been set in the option field on the watchdog's
> +  info structure).
>   * status: this routine checks the status of the watchdog timer device. The
>     status of the device is reported with watchdog WDIOF_* status flags/bits.
>
> diff --git a/drivers/watchdog/core/watchdog_dev.c b/drivers/watchdog/core/watchdog_dev.c
> index ad08a93..0d2ed1d 100644
> --- a/drivers/watchdog/core/watchdog_dev.c
> +++ b/drivers/watchdog/core/watchdog_dev.c
> @@ -151,6 +151,11 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
>   		return put_user(val, p);
>   	case WDIOC_GETBOOTSTATUS:
>   		return put_user(wdd->bootstatus, p);
> +	case WDIOC_KEEPALIVE:
> +		if (!(wdd->info->options&  WDIOF_MAGICCLOSE))

Is this meant to be WDIOF_KEEPALIVEPING ?


> +			return -EOPNOTSUPP;
> +		watchdog_ping(wdd);
> +		return 0;
>   	default:
>   		return -ENOTTY;
>   	}
> diff --git a/include/linux/watchdog.h b/include/linux/watchdog.h
> index 4d00bf8..a41dca3 100644
> --- a/include/linux/watchdog.h
> +++ b/include/linux/watchdog.h
> @@ -69,12 +69,15 @@ struct watchdog_ops {
>   	int (*stop)(struct watchdog_device *);
>   	/* optional operations */
>   	int (*ping)(struct watchdog_device *);
> +	int (*status)(struct watchdog_device *);
>   };
>
>   /* The structure that defines a watchdog device */
>   struct watchdog_device {
>   	char *name;
> +	const struct watchdog_info *info;
>   	const struct watchdog_ops *ops;
> +	int bootstatus;
>   	long status;
>   #define WDOG_DEV_OPEN		1	/* is the watchdog opened via
>   					 * /dev/watchdog */

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