Commit dab4075e authored by Dave Jones's avatar Dave Jones

[PATCH] watchdog nowayout for mixcomwd

Originally from Matt Domsch.
Adds a nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
From 2.4
parent 99458ba3
......@@ -28,9 +28,12 @@
* Version 0.4 (99/11/15):
* - support for one more type board
*
* Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>
* - added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
*
*/
#define VERSION "0.4"
#define VERSION "0.5"
#include <linux/module.h>
#include <linux/config.h>
......@@ -57,26 +60,30 @@ static int mixcomwd_ioports[] = { 0x180, 0x280, 0x380, 0x000 };
static long mixcomwd_opened; /* long req'd for setbit --RR */
static int watchdog_port;
#ifndef CONFIG_WATCHDOG_NOWAYOUT
static int mixcomwd_timer_alive;
static struct timer_list mixcomwd_timer;
#ifdef CONFIG_WATCHDOG_NOWAYOUT
static int nowayout = 1;
#else
static int nowayout = 0;
#endif
MODULE_PARM(nowayout,"i");
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
static void mixcomwd_ping(void)
{
outb_p(55,watchdog_port);
return;
}
#ifndef CONFIG_WATCHDOG_NOWAYOUT
static void mixcomwd_timerfun(unsigned long d)
{
mixcomwd_ping();
mod_timer(&mixcomwd_timer,jiffies+ 5*HZ);
}
#endif
/*
* Allow only one person to hold it open
......@@ -89,19 +96,21 @@ static int mixcomwd_open(struct inode *inode, struct file *file)
}
mixcomwd_ping();
#ifndef CONFIG_WATCHDOG_NOWAYOUT
if (nowayout) {
MOD_INC_USE_COUNT;
} else {
if(mixcomwd_timer_alive) {
del_timer(&mixcomwd_timer);
mixcomwd_timer_alive=0;
}
#endif
}
return 0;
}
static int mixcomwd_release(struct inode *inode, struct file *file)
{
#ifndef CONFIG_WATCHDOG_NOWAYOUT
if (!nowayout) {
if(mixcomwd_timer_alive) {
printk(KERN_ERR "mixcomwd: release called while internal timer alive");
return -EBUSY;
......@@ -112,8 +121,7 @@ static int mixcomwd_release(struct inode *inode, struct file *file)
mixcomwd_timer.data=0;
mixcomwd_timer_alive=1;
add_timer(&mixcomwd_timer);
#endif
}
clear_bit(0,&mixcomwd_opened);
return 0;
}
......@@ -145,9 +153,9 @@ static int mixcomwd_ioctl(struct inode *inode, struct file *file,
{
case WDIOC_GETSTATUS:
status=mixcomwd_opened;
#ifndef CONFIG_WATCHDOG_NOWAYOUT
if (!nowayout) {
status|=mixcomwd_timer_alive;
#endif
}
if (copy_to_user((int *)arg, &status, sizeof(int))) {
return -EFAULT;
}
......@@ -252,14 +260,14 @@ static int __init mixcomwd_init(void)
static void __exit mixcomwd_exit(void)
{
#ifndef CONFIG_WATCHDOG_NOWAYOUT
if (!nowayout) {
if(mixcomwd_timer_alive) {
printk(KERN_WARNING "mixcomwd: I quit now, hardware will"
" probably reboot!\n");
del_timer(&mixcomwd_timer);
mixcomwd_timer_alive=0;
}
#endif
}
release_region(watchdog_port,1);
misc_deregister(&mixcomwd_miscdev);
}
......
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