linux-imx

/*

 *  SoftDog:    A Software Watchdog Device

 *

 *  (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,

 *                          All Rights Reserved.

 *

 *  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.

 *

 *  Neither Alan Cox nor CymruNet Ltd. admit liability nor provide

 *  warranty for any of this software. This material is provided

 *  "AS-IS" and at no charge.

 *

 *  (c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>

 *

 *  Software only watchdog driver. Unlike its big brother the WDT501P

 *  driver this won't always recover a failed machine.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/hrtimer.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/moduleparam.h>

#include <linux/reboot.h>

#include <linux/types.h>

#include <linux/watchdog.h>

​

#define TIMER_MARGIN    60      /* Default is 60 seconds */

static unsigned int soft_margin = TIMER_MARGIN; /* in seconds */

module_param(soft_margin, uint, 0);

MODULE_PARM_DESC(soft_margin,

    "Watchdog soft_margin in seconds. (0 < soft_margin < 65536, default="

                    __MODULE_STRING(TIMER_MARGIN) ")");

​

static bool nowayout = WATCHDOG_NOWAYOUT;

module_param(nowayout, bool, 0);

MODULE_PARM_DESC(nowayout,

        "Watchdog cannot be stopped once started (default="

                __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

​

static int soft_noboot;

module_param(soft_noboot, int, 0);

MODULE_PARM_DESC(soft_noboot,

    "Softdog action, set to 1 to ignore reboots, 0 to reboot (default=0)");

​

static int soft_panic;

module_param(soft_panic, int, 0);

MODULE_PARM_DESC(soft_panic,

    "Softdog action, set to 1 to panic, 0 to reboot (default=0)");

​

static struct hrtimer softdog_ticktock;

static struct hrtimer softdog_preticktock;

​

static enum hrtimer_restart softdog_fire(struct hrtimer *timer)

{

    module_put(THIS_MODULE);

    if (soft_noboot) {

        pr_crit("Triggered - Reboot ignored\n");