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* Industrial Computer Source WDT500/501 driver for Linux 1.3.x
*
* (c) Copyright 1995 CymruNET Ltd
* Innovation Centre
* Singleton Park
* Swansea
* Wales
* UK
* SA2 8PP
*
* http://www.cymru.net
*
* This driver is provided under the GNU public license, incorporated
* herein by reference. The driver is provided without warranty or
* support.
*
* Release 0.05.
*
* Some changes by Dave Gregorich to fix modularisation and minor bugs.
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/version.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/miscdevice.h>
#include "wd501p.h"
#include <linux/malloc.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <asm/io.h>
#include <asm/segment.h>
#include <asm/system.h>
static int wdt_is_open=0;
/*
* You must set these - there is no sane way to probe for this board.
*/
static int io=0x240;
static int irq=14;
#define WD_TIMO (100*60) /* 1 minute */
/*
* Programming support
*/
static void wdt_ctr_mode(int ctr, int mode)
{
ctr<<=6;
ctr|=0x30;
ctr|=(mode<<1);
outb_p(ctr, WDT_CR);
}
static void wdt_ctr_load(int ctr, int val)
{
outb_p(val&0xFF, WDT_COUNT0+ctr);
outb_p(val>>8, WDT_COUNT0+ctr);
}
/*
* Kernel methods.
*/
static void wdt_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
/*
* Read the status register see what is up and
* then printk it.
*/
unsigned char status=inb_p(WDT_SR);
status|=FEATUREMAP1;
status&=~FEATUREMAP2;
printk(KERN_CRIT "WDT status %d\n", status);
if(!(status&WDC_SR_TGOOD))
printk(KERN_CRIT "Overheat alarm.(%d)\n",inb_p(WDT_RT));
if(!(status&WDC_SR_PSUOVER))
printk(KERN_CRIT "PSU over voltage.\n");
if(!(status&WDC_SR_PSUUNDR))
printk(KERN_CRIT "PSU under voltage.\n");
if(!(status&WDC_SR_FANGOOD))
printk(KERN_CRIT "Possible fan fault.\n");
if(!(status&WDC_SR_WCCR))
#ifdef SOFTWARE_REBOOT
#ifdef ONLY_TESTING
printk(KERN_CRIT "Would Reboot.\n");
#else
printk(KERN_CRIT "Initiating system reboot.\n");
hard_reset_now();
#endif
#else
printk(KERN_CRIT "Reset in 5ms.\n");
#endif
}
static int wdt_lseek(struct inode *inode, struct file *file, off_t offset,
int origin)
{
return -ESPIPE;
}
static int wdt_write(struct inode *inode, struct file *file, const char *buf, int count)
{
/* Write a watchdog value */
inb_p(WDT_DC);
wdt_ctr_mode(1,2);
wdt_ctr_load(1,WD_TIMO); /* Timeout */
outb_p(0, WDT_DC);
return count;
}
/*
* Read reports the temperature in farenheit
*/
static int wdt_read(struct inode *inode, struct file *file, char *buf, int count)
{
unsigned short c=inb_p(WDT_RT);
unsigned char cp;
int err;
switch(MINOR(inode->i_rdev))
{
case TEMP_MINOR:
err=verify_area(VERIFY_WRITE, buf, 1);
if(err)
return err;
c*=11;
c/=15;
cp=c+7;
memcpy_tofs(buf,&cp,1);
return 1;
default:
return -EINVAL;
}
}
static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
return -EINVAL;
}
static int wdt_open(struct inode *inode, struct file *file)
{
switch(MINOR(inode->i_rdev))
{
case WATCHDOG_MINOR:
if(wdt_is_open)
return -EBUSY;
MOD_INC_USE_COUNT;
/*
* Activate
*/
wdt_is_open=1;
inb_p(WDT_DC); /* Disable */
wdt_ctr_mode(0,3);
wdt_ctr_mode(1,2);
wdt_ctr_mode(2,0);
wdt_ctr_load(0, 8948); /* count at 100Hz */
wdt_ctr_load(1,WD_TIMO); /* Timeout 120 seconds */
wdt_ctr_load(2,65535);
outb_p(0, WDT_DC); /* Enable */
return 0;
case TEMP_MINOR:
MOD_INC_USE_COUNT;
return 0;
default:
return -ENODEV;
}
}
static void wdt_release(struct inode *inode, struct file *file)
{
if(MINOR(inode->i_rdev)==WATCHDOG_MINOR)
{
#ifndef CONFIG_WATCHDOG_NOWAYOUT
inb_p(WDT_DC); /* Disable counters */
wdt_ctr_load(2,0); /* 0 length reset pulses now */
#endif
wdt_is_open=0;
}
MOD_DEC_USE_COUNT;
}
/*
* Kernel Interfaces
*/
static struct file_operations wdt_fops = {
wdt_lseek,
wdt_read,
wdt_write,
NULL, /* No Readdir */
NULL, /* No Select */
wdt_ioctl,
NULL, /* No mmap */
wdt_open,
wdt_release
};
static struct miscdevice wdt_miscdev=
{
WATCHDOG_MINOR,
"wdt",
&wdt_fops
};
#ifdef CONFIG_WDT_501
static struct miscdevice temp_miscdev=
{
TEMP_MINOR,
"temperature",
&wdt_fops
};
#endif
#ifdef MODULE
int init_module(void)
{
printk("WDT501-P module at %X(Interrupt %d)\n", io,irq);
if(request_irq(irq, wdt_interrupt, SA_INTERRUPT, "wdt501p", NULL))
{
printk("IRQ %d is not free.\n", irq);
return -EIO;
}
misc_register(&wdt_miscdev);
#ifdef CONFIG_WDT_501
misc_register(&temp_miscdev);
#endif
request_region(io, 8, "wdt501");
return 0;
}
void cleanup_module(void)
{
misc_deregister(&wdt_miscdev);
#ifdef CONFIG_WDT_501
misc_deregister(&temp_miscdev);
#endif
release_region(io,8);
free_irq(irq, NULL);
}
#else
int wdt_init(void)
{
printk("WDT500/501-P driver at %X(Interrupt %d)\n", io,irq);
if(request_irq(irq, wdt_interrupt, SA_INTERRUPT, "wdt501p", NULL))
{
printk("IRQ %d is not free.\n", irq);
return -EIO;
}
misc_register(&wdt_miscdev);
#ifdef CONFIG_WDT_501
misc_register(&temp_miscdev);
#endif
request_region(io, 8, "wdt501");
return 0;
}
#endif
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