/*
- * Advantech Single Board Computer WDT driver for Linux 2.4.x
+ * Advantech Single Board Computer WDT driver
*
* (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
*
*
* 14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
* Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ *
+ * 16-Oct-2002 Rob Radez <rob@osinvestor.com>
+ * Clean up ioctls, clean up init + exit, add expect close support,
+ * add wdt_start and wdt_stop as parameters.
*/
-#include <linux/config.h>
#include <linux/module.h>
+#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <asm/uaccess.h>
#include <asm/system.h>
+#define WATCHDOG_NAME "Advantech WDT"
+#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
+
static unsigned long advwdt_is_open;
static char adv_expect_close;
* the manual says wdt_stop is 0x43, not 0x443).
* (0x43 is also a write-only control register for the 8254 timer!)
*/
-
+
static int wdt_stop = 0x443;
+module_param(wdt_stop, int, 0);
+MODULE_PARM_DESC(wdt_stop, "Advantech WDT 'stop' io port (default 0x443)");
+
static int wdt_start = 0x443;
+module_param(wdt_start, int, 0);
+MODULE_PARM_DESC(wdt_start, "Advantech WDT 'start' io port (default 0x443)");
-static int wd_margin = 60; /* 60 sec default timeout */
+static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
+module_param(timeout, int, 0);
+MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=63, default=60.");
#ifdef CONFIG_WATCHDOG_NOWAYOUT
static int nowayout = 1;
static int nowayout = 0;
#endif
-MODULE_PARM(nowayout,"i");
+module_param(nowayout, int, 0);
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
/*
* Kernel methods.
*/
-#ifndef MODULE
-
-static int __init adv_setup(char *str)
-{
- int ints[4];
-
- str = get_options(str, ARRAY_SIZE(ints), ints);
-
- if(ints[0] > 0){
- wdt_stop = ints[1];
- if(ints[0] > 1)
- wdt_start = ints[2];
- }
-
- return 1;
-}
-
-__setup("advwdt=", adv_setup);
-
-#endif /* !MODULE */
-
-MODULE_PARM(wdt_stop, "i");
-MODULE_PARM_DESC(wdt_stop, "Advantech WDT 'stop' io port (default 0x443)");
-MODULE_PARM(wdt_start, "i");
-MODULE_PARM_DESC(wdt_start, "Advantech WDT 'start' io port (default 0x443)");
-
static void
advwdt_ping(void)
{
/* Write a watchdog value */
- outb_p(wd_margin, wdt_start);
+ outb_p(timeout, wdt_start);
}
static void
advwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
unsigned long arg)
{
- int new_margin;
+ int new_timeout;
static struct watchdog_info ident = {
.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
.firmware_version = 1,
break;
case WDIOC_SETTIMEOUT:
- if (get_user(new_margin, (int *)arg))
+ if (get_user(new_timeout, (int *)arg))
return -EFAULT;
- if ((new_margin < 1) || (new_margin > 63))
+ if ((new_timeout < 1) || (new_timeout > 63))
return -EINVAL;
- wd_margin = new_margin;
+ timeout = new_timeout;
advwdt_ping();
/* Fall */
case WDIOC_GETTIMEOUT:
- return put_user(wd_margin, (int *)arg);
+ return put_user(timeout, (int *)arg);
case WDIOC_SETOPTIONS:
{
if (adv_expect_close == 42) {
advwdt_disable();
} else {
- printk(KERN_CRIT "advancetechwdt: Unexpected close, not stopping watchdog!\n");
+ printk(KERN_CRIT WATCHDOG_NAME ": Unexpected close, not stopping watchdog!\n");
advwdt_ping();
}
clear_bit(0, &advwdt_is_open);
}
return NOTIFY_DONE;
}
-
+
/*
* Kernel Interfaces
*/
-
+
static struct file_operations advwdt_fops = {
.owner = THIS_MODULE,
+ .llseek = no_llseek,
.write = advwdt_write,
.ioctl = advwdt_ioctl,
.open = advwdt_open,
static struct miscdevice advwdt_miscdev = {
.minor = WATCHDOG_MINOR,
.name = "watchdog",
- .fops = &advwdt_fops
+ .fops = &advwdt_fops,
};
/*
* 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 advwdt_notifier = {
.notifier_call = advwdt_notify_sys,
.next = NULL,
- .priority = 0
+ .priority = 0,
};
static int __init
advwdt_init(void)
{
+ int ret;
+
printk(KERN_INFO "WDT driver for Advantech single board computer initialising.\n");
- if (misc_register(&advwdt_miscdev))
- return -ENODEV;
- if (wdt_stop != wdt_start)
- if (!request_region(wdt_stop, 1, "Advantech WDT")) {
- misc_deregister(&advwdt_miscdev);
- return -EIO;
+ if (timeout < 1 || timeout > 63) {
+ timeout = WATCHDOG_TIMEOUT;
+ printk (KERN_INFO WATCHDOG_NAME ": timeout value must be 1<=x<=63, using %d\n",
+ timeout);
}
- if (!request_region(wdt_start, 1, "Advantech WDT")) {
- misc_deregister(&advwdt_miscdev);
- if (wdt_stop != wdt_start)
- release_region(wdt_stop, 1);
- return -EIO;
+
+ if (wdt_stop != wdt_start) {
+ if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) {
+ printk (KERN_ERR WATCHDOG_NAME ": I/O address 0x%04x already in use\n",
+ wdt_stop);
+ ret = -EIO;
+ goto out;
+ }
}
- register_reboot_notifier(&advwdt_notifier);
- return 0;
+
+ if (!request_region(wdt_start, 1, WATCHDOG_NAME)) {
+ printk (KERN_ERR WATCHDOG_NAME ": I/O address 0x%04x already in use\n",
+ wdt_start);
+ ret = -EIO;
+ goto unreg_stop;
+ }
+
+ ret = register_reboot_notifier(&advwdt_notifier);
+ if (ret != 0) {
+ printk (KERN_ERR WATCHDOG_NAME ": cannot register reboot notifier (err=%d)\n",
+ ret);
+ goto unreg_regions;
+ }
+
+ ret = misc_register(&advwdt_miscdev);
+ if (ret != 0) {
+ printk (KERN_ERR WATCHDOG_NAME ": cannot register miscdev on minor=%d (err=%d)\n",
+ WATCHDOG_MINOR, ret);
+ goto unreg_reboot;
+ }
+
+ printk (KERN_INFO WATCHDOG_NAME ": initialized. timeout=%d sec (nowayout=%d)\n",
+ timeout, nowayout);
+
+out:
+ return ret;
+unreg_reboot:
+ unregister_reboot_notifier(&advwdt_notifier);
+unreg_regions:
+ release_region(wdt_start, 1);
+unreg_stop:
+ if (wdt_stop != wdt_start)
+ release_region(wdt_stop, 1);
+ goto out;
}
static void __exit
projects / linux-flexiantxendom0-3.2.10.git / blobdiff