/*
- * W83877F Computer Watchdog Timer driver for Linux 2.4.x
+ * W83877F Computer Watchdog Timer driver
*
* Based on acquirewdt.c by Alan Cox,
- * and sbc60xxwdt.c by Jakob Oestergaard <jakob@ostenfeld.dk>
- *
+ * and sbc60xxwdt.c by Jakob Oestergaard <jakob@unthought.net>
+ *
* 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.
- *
- * The authors do NOT admit liability nor provide warranty for
- * any of this software. This material is provided "AS-IS" in
+ *
+ * The authors do NOT admit liability nor provide warranty for
+ * any of this software. This material is provided "AS-IS" in
* the hope that it may be useful for others.
*
* (c) Copyright 2001 Scott Jennings <linuxdrivers@oro.net>
*
* 4/19 - 2001 [Initial revision]
* 9/27 - 2001 Added spinlocking
- *
- *
- * Theory of operation:
- * A Watchdog Timer (WDT) is a hardware circuit that can
- * reset the computer system in case of a software fault.
- * You probably knew that already.
- *
- * Usually a userspace daemon will notify the kernel WDT driver
- * via the /proc/watchdog special device file that userspace is
- * still alive, at regular intervals. When such a notification
- * occurs, the driver will usually tell the hardware watchdog
- * that everything is in order, and that the watchdog should wait
- * for yet another little while to reset the system.
- * If userspace fails (RAM error, kernel bug, whatever), the
- * notifications cease to occur, and the hardware watchdog will
- * reset the system (causing a reboot) after the timeout occurs.
+ * 4/12 - 2002 [rob@osinvestor.com] Eliminate extra comments
+ * Eliminate fop_read
+ * Eliminate extra spin_unlock
+ * Added KERN_* tags to printks
+ * 09/8 - 2003 [wim@iguana.be] cleanup of trailing spaces
+ * added extra printk's for startup problems
*
* This WDT driver is different from most other Linux WDT
* drivers in that the driver will ping the watchdog by itself,
*/
#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/timer.h>
#include <linux/jiffies.h>
#include <asm/system.h>
#define OUR_NAME "w83877f_wdt"
+#define PFX OUR_NAME ": "
#define ENABLE_W83877F_PORT 0x3F0
#define ENABLE_W83877F 0x87
static void wdt_timer_ping(unsigned long data)
{
/* If we got a heartbeat pulse within the WDT_US_INTERVAL
- * we agree to ping the WDT
+ * we agree to ping the WDT
*/
- if(time_before(jiffies, next_heartbeat))
+ if(time_before(jiffies, next_heartbeat))
{
/* Ping the WDT */
spin_lock(&wdt_spinlock);
spin_unlock(&wdt_spinlock);
} else {
- printk(OUR_NAME ": Heartbeat lost! Will not ping the watchdog\n");
+ printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
}
}
-/*
+/*
* Utility routines
*/
next_heartbeat = jiffies + WDT_HEARTBEAT;
/* Start the timer */
- timer.expires = jiffies + WDT_INTERVAL;
+ timer.expires = jiffies + WDT_INTERVAL;
add_timer(&timer);
wdt_change(WDT_ENABLE);
- printk(OUR_NAME ": Watchdog timer is now enabled.\n");
+ printk(KERN_INFO PFX "Watchdog timer is now enabled.\n");
}
static void wdt_turnoff(void)
wdt_change(WDT_DISABLE);
- printk(OUR_NAME ": Watchdog timer is now disabled...\n");
+ printk(KERN_INFO PFX "Watchdog timer is now disabled...\n");
}
return -ESPIPE;
/* See if we got the magic character */
- if(count)
+ if(count)
{
size_t ofs;
static int fop_open(struct inode * inode, struct file * file)
{
- switch(minor(inode->i_rdev))
+ switch(minor(inode->i_rdev))
{
case WATCHDOG_MINOR:
/* Just in case we're already talking to someone... */
if(test_and_set_bit(0, &wdt_is_open)) {
- /* Davej: Is this unlock bogus? */
- spin_unlock(&wdt_spinlock);
return -EBUSY;
}
/* Good, fire up the show */
static int fop_close(struct inode * inode, struct file * file)
{
- if(minor(inode->i_rdev) == WATCHDOG_MINOR)
+ if(minor(inode->i_rdev) == WATCHDOG_MINOR)
{
if(wdt_expect_close)
wdt_turnoff();
else {
del_timer(&timer);
- printk(OUR_NAME ": device file closed unexpectedly. Will not stop the WDT!\n");
+ printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n");
}
}
clear_bit(0, &wdt_is_open);
{
.options = WDIOF_MAGICCLOSE,
.firmware_version = 1,
- .identity = "W83877F"
+ .identity = "W83877F",
};
-
+
switch(cmd)
{
default:
.write = fop_write,
.open = fop_open,
.release = fop_close,
- .ioctl = fop_ioctl
+ .ioctl = fop_ioctl,
};
static struct miscdevice wdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
- .fops = &wdt_fops
+ .fops = &wdt_fops,
};
/*
static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
void *unused)
{
- if(code==SYS_DOWN || code==SYS_HALT)
+ if(code==SYS_DOWN || code==SYS_HALT)
wdt_turnoff();
return NOTIFY_DONE;
}
-
+
/*
* The WDT needs to learn about soft shutdowns in order to
- * turn the timebomb registers off.
+ * turn the timebomb registers off.
*/
-
+
static struct notifier_block wdt_notifier=
{
.notifier_call = wdt_notify_sys,
.next = NULL,
- .priority = 0
+ .priority = 0,
};
static void __exit w83877f_wdt_unload(void)
spin_lock_init(&wdt_spinlock);
if (!request_region(ENABLE_W83877F_PORT, 2, "W83877F WDT"))
+ {
+ printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
+ ENABLE_W83877F_PORT);
+ rc = -EIO;
goto err_out;
+ }
+
if (!request_region(WDT_PING, 1, "W8387FF WDT"))
+ {
+ printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
+ WDT_PING);
+ rc = -EIO;
goto err_out_region1;
+ }
init_timer(&timer);
timer.function = wdt_timer_ping;
rc = misc_register(&wdt_miscdev);
if (rc)
+ {
+ printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
+ wdt_miscdev.minor, rc);
goto err_out_region2;
+ }
rc = register_reboot_notifier(&wdt_notifier);
if (rc)
+ {
+ printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
+ rc);
goto err_out_miscdev;
+ }
+
+ printk(KERN_INFO PFX "WDT driver for W83877F initialised.\n");
- printk(KERN_INFO OUR_NAME ": WDT driver for W83877F initialised.\n");
-
return 0;
err_out_miscdev:
projects / linux / commitdiff