patch-2.3.48 linux/drivers/char/wdt977.c

• Lines: 205
• Date: Thu Feb 24 22:56:47 2000
• Orig file: v2.3.47/linux/drivers/char/wdt977.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.47/linux/drivers/char/wdt977.c linux/drivers/char/wdt977.c
@@ -0,0 +1,204 @@
+/*
+ *	Wdt977	0.01:	A Watchdog Device for Netwinder W83977AF chip
+ *
+ *	(c) Copyright 1998 Rebel.com (Woody Suwalski <woody@netwinder.org>)
+ *
+ *			-----------------------
+ *
+ *	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.
+ *
+ *			-----------------------
+ */
+ 
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/system.h>
+
+#define WATCHDOG_MINOR	130
+
+static	int timeout = 3;
+static	int timer_alive = 0;
+static	int testmode = 0;
+
+/*
+ *	Allow only one person to hold it open
+ */
+ 
+static int wdt977_open(struct inode *inode, struct file *file)
+{
+	if(timer_alive)
+		return -EBUSY;
+	MOD_INC_USE_COUNT;
+	timer_alive++;
+
+	//max timeout value = 255 minutes (0xFF). Write 0 to disable WatchDog.
+	if (timeout>255)
+	    timeout = 255;
+
+	printk(KERN_INFO "Watchdog: active, current timeout %d min.\n",timeout);
+
+	// unlock the SuperIO chip
+	outb(0x87,0x370); 
+	outb(0x87,0x370); 
+	
+	//select device Aux2 (device=8) and set watchdog regs F2, F3 and F4
+	//F2 has the timeout in minutes
+	//F3 could be set to the POWER LED blink (with GP17 set to PowerLed)
+	//   at timeout, and to reset timer on kbd/mouse activity (not now)
+	//F4 is used to just clear the TIMEOUT'ed state (bit 0)
+	
+	outb(0x07,0x370);
+	outb(0x08,0x371);
+	outb(0xF2,0x370);
+	outb(timeout,0x371);
+	outb(0xF3,0x370);
+	outb(0x00,0x371);	//another setting is 0E for kbd/mouse/LED
+	outb(0xF4,0x370);
+	outb(0x00,0x371);
+	
+	//at last select device Aux1 (dev=7) and set GP16 as a watchdog output
+	if (!testmode)
+	{
+		outb(0x07,0x370);
+		outb(0x07,0x371);
+		outb(0xE6,0x370);
+		outb(0x08,0x371);
+	}
+		
+	// lock the SuperIO chip
+	outb(0xAA,0x370); 
+
+	return 0;
+}
+
+static int wdt977_release(struct inode *inode, struct file *file)
+{
+	/*
+	 *	Shut off the timer.
+	 * 	Lock it in if it's a module and we defined ...NOWAYOUT
+	 */
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+
+	// unlock the SuperIO chip
+	outb(0x87,0x370); 
+	outb(0x87,0x370); 
+	
+	//select device Aux2 (device=8) and set watchdog regs F2,F3 and F4
+	//F3 is reset to its default state
+	//F4 can clear the TIMEOUT'ed state (bit 0) - back to default
+	//We can not use GP17 as a PowerLed, as we use its usage as a RedLed
+	
+	outb(0x07,0x370);
+	outb(0x08,0x371);
+	outb(0xF2,0x370);
+	outb(0xFF,0x371);
+	outb(0xF3,0x370);
+	outb(0x00,0x371);
+	outb(0xF4,0x370);
+	outb(0x00,0x371);
+	outb(0xF2,0x370);
+	outb(0x00,0x371);
+	
+	//at last select device Aux1 (dev=7) and set GP16 as a watchdog output
+	outb(0x07,0x370);
+	outb(0x07,0x371);
+	outb(0xE6,0x370);
+	outb(0x08,0x371);
+	
+	// lock the SuperIO chip
+	outb(0xAA,0x370);
+
+	MOD_DEC_USE_COUNT;
+	timer_alive=0;
+
+	printk(KERN_INFO "Watchdog: shutdown.\n");
+#endif
+	return 0;
+}
+
+static ssize_t wdt977_write(struct file *file, const char *data, size_t len, loff_t *ppos)
+{
+
+	//max timeout value = 255 minutes (0xFF). Write 0 to disable WatchDog.
+	if (timeout>255)
+	    timeout = 255;
+
+	/*
+	 *	Refresh the timer.
+	 */
+		
+	//we have a hw bug somewhere, so each 977 minute is actually only 30sec
+	//as such limit the max timeout to half of max of 255 minutes...
+//	if (timeout>126)
+//	    timeout = 126;
+	
+	// unlock the SuperIO chip
+	outb(0x87,0x370); 
+	outb(0x87,0x370); 
+	
+	//select device Aux2 (device=8) and kicks watchdog reg F2
+	//F2 has the timeout in minutes
+	
+	outb(0x07,0x370);
+	outb(0x08,0x371);
+	outb(0xF2,0x370);
+	outb(timeout,0x371);
+	
+	// lock the SuperIO chip
+	outb(0xAA,0x370); 
+	
+	return 1;
+}
+
+static struct file_operations wdt977_fops=
+{
+	NULL,		/* Seek */
+	NULL,		/* Read */
+	wdt977_write,	/* Write */
+	NULL,		/* Readdir */
+	NULL,		/* Select */
+	NULL,		/* Ioctl */
+	NULL,		/* MMap */
+	wdt977_open,
+	NULL,		/* flush */
+	wdt977_release,
+	NULL,		
+	NULL		/* Fasync */
+};
+
+static struct miscdevice wdt977_miscdev=
+{
+	WATCHDOG_MINOR,
+	"watchdog",
+	&wdt977_fops
+};
+
+static int __init nwwatchdog_init(void)
+{
+	if (!machine_is_netwinder())
+		return -ENODEV;
+
+	misc_register(&wdt977_miscdev);
+	printk(KERN_INFO "NetWinder Watchdog sleeping.\n");
+	return 0;
+}	
+
+static void __exit nwwatchdog_exit(void)
+{
+	misc_deregister(&wdt977_miscdev);
+}
+
+EXPORT_NO_SYMBOLS;
+
+module_init(nwwatchdog_init);
+module_exit(nwwatchdog_exit);