Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog

* git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog:
  mv watchdog tree under drivers

1 files changed, 640 insertions, 0 deletions

diff --git a/drivers/watchdog/wdt.c b/drivers/watchdog/wdt.c
new file mode 100644
index 000000000000..0a3de6a02442
--- /dev/null
+++ b/drivers/watchdog/wdt.c
@@ -0,0 +1,640 @@
+/*
+ *	Industrial Computer Source WDT500/501 driver
+ *
+ *	(c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved.
+ *				http://www.redhat.com
+ *
+ *	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.
+ *
+ *	Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
+ *	warranty for any of this software. This material is provided
+ *	"AS-IS" and at no charge.
+ *
+ *	(c) Copyright 1995    Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ *	Release 0.10.
+ *
+ *	Fixes
+ *		Dave Gregorich	:	Modularisation and minor bugs
+ *		Alan Cox	:	Added the watchdog ioctl() stuff
+ *		Alan Cox	:	Fixed the reboot problem (as noted by
+ *					Matt Crocker).
+ *		Alan Cox	:	Added wdt= boot option
+ *		Alan Cox	:	Cleaned up copy/user stuff
+ *		Tim Hockin	:	Added insmod parameters, comment cleanup
+ *					Parameterized timeout
+ *		Tigran Aivazian	:	Restructured wdt_init() to handle failures
+ *		Joel Becker	:	Added WDIOC_GET/SETTIMEOUT
+ *		Matt Domsch	:	Added nowayout module option
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/fs.h>
+#include <linux/ioport.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/init.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include "wd501p.h"
+
+static unsigned long wdt_is_open;
+static char expect_close;
+
+/*
+ *	Module parameters
+ */
+
+#define WD_TIMO 60			/* Default heartbeat = 60 seconds */
+
+static int heartbeat = WD_TIMO;
+static int wd_heartbeat;
+module_param(heartbeat, int, 0);
+MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")");
+
+static int nowayout = WATCHDOG_NOWAYOUT;
+module_param(nowayout, int, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+/* You must set these - there is no sane way to probe for this board. */
+static int io=0x240;
+static int irq=11;
+
+module_param(io, int, 0);
+MODULE_PARM_DESC(io, "WDT io port (default=0x240)");
+module_param(irq, int, 0);
+MODULE_PARM_DESC(irq, "WDT irq (default=11)");
+
+#ifdef CONFIG_WDT_501
+/* Support for the Fan Tachometer on the WDT501-P */
+static int tachometer;
+
+module_param(tachometer, int, 0);
+MODULE_PARM_DESC(tachometer, "WDT501-P Fan Tachometer support (0=disable, default=0)");
+#endif /* CONFIG_WDT_501 */
+
+/*
+ *	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);
+}
+
+/**
+ *	wdt_start:
+ *
+ *	Start the watchdog driver.
+ */
+
+static int wdt_start(void)
+{
+	inb_p(WDT_DC);			/* Disable watchdog */
+	wdt_ctr_mode(0,3);		/* Program CTR0 for Mode 3: Square Wave Generator */
+	wdt_ctr_mode(1,2);		/* Program CTR1 for Mode 2: Rate Generator */
+	wdt_ctr_mode(2,0);		/* Program CTR2 for Mode 0: Pulse on Terminal Count */
+	wdt_ctr_load(0, 8948);		/* Count at 100Hz */
+	wdt_ctr_load(1,wd_heartbeat);	/* Heartbeat */
+	wdt_ctr_load(2,65535);		/* Length of reset pulse */
+	outb_p(0, WDT_DC);		/* Enable watchdog */
+	return 0;
+}
+
+/**
+ *	wdt_stop:
+ *
+ *	Stop the watchdog driver.
+ */
+
+static int wdt_stop (void)
+{
+	/* Turn the card off */
+	inb_p(WDT_DC);			/* Disable watchdog */
+	wdt_ctr_load(2,0);		/* 0 length reset pulses now */
+	return 0;
+}
+
+/**
+ *	wdt_ping:
+ *
+ *	Reload counter one with the watchdog heartbeat. We don't bother reloading
+ *	the cascade counter.
+ */
+
+static int wdt_ping(void)
+{
+	/* Write a watchdog value */
+	inb_p(WDT_DC);			/* Disable watchdog */
+	wdt_ctr_mode(1,2);		/* Re-Program CTR1 for Mode 2: Rate Generator */
+	wdt_ctr_load(1,wd_heartbeat);	/* Heartbeat */
+	outb_p(0, WDT_DC);		/* Enable watchdog */
+	return 0;
+}
+
+/**
+ *	wdt_set_heartbeat:
+ *	@t:		the new heartbeat value that needs to be set.
+ *
+ *	Set a new heartbeat value for the watchdog device. If the heartbeat value is
+ *	incorrect we keep the old value and return -EINVAL. If successfull we
+ *	return 0.
+ */
+static int wdt_set_heartbeat(int t)
+{
+	if ((t < 1) || (t > 65535))
+		return -EINVAL;
+
+	heartbeat = t;
+	wd_heartbeat = t * 100;
+	return 0;
+}
+
+/**
+ *	wdt_get_status:
+ *	@status:		the new status.
+ *
+ *	Extract the status information from a WDT watchdog device. There are
+ *	several board variants so we have to know which bits are valid. Some
+ *	bits default to one and some to zero in order to be maximally painful.
+ *
+ *	we then map the bits onto the status ioctl flags.
+ */
+
+static int wdt_get_status(int *status)
+{
+	unsigned char new_status=inb_p(WDT_SR);
+
+	*status=0;
+	if (new_status & WDC_SR_ISOI0)
+		*status |= WDIOF_EXTERN1;
+	if (new_status & WDC_SR_ISII1)
+		*status |= WDIOF_EXTERN2;
+#ifdef CONFIG_WDT_501
+	if (!(new_status & WDC_SR_TGOOD))
+		*status |= WDIOF_OVERHEAT;
+	if (!(new_status & WDC_SR_PSUOVER))
+		*status |= WDIOF_POWEROVER;
+	if (!(new_status & WDC_SR_PSUUNDR))
+		*status |= WDIOF_POWERUNDER;
+	if (tachometer) {
+		if (!(new_status & WDC_SR_FANGOOD))
+			*status |= WDIOF_FANFAULT;
+	}
+#endif /* CONFIG_WDT_501 */
+	return 0;
+}
+
+#ifdef CONFIG_WDT_501
+/**
+ *	wdt_get_temperature:
+ *
+ *	Reports the temperature in degrees Fahrenheit. The API is in
+ *	farenheit. It was designed by an imperial measurement luddite.
+ */
+
+static int wdt_get_temperature(int *temperature)
+{
+	unsigned short c=inb_p(WDT_RT);
+
+	*temperature = (c * 11 / 15) + 7;
+	return 0;
+}
+#endif /* CONFIG_WDT_501 */
+
+/**
+ *	wdt_interrupt:
+ *	@irq:		Interrupt number
+ *	@dev_id:	Unused as we don't allow multiple devices.
+ *
+ *	Handle an interrupt from the board. These are raised when the status
+ *	map changes in what the board considers an interesting way. That means
+ *	a failure condition occurring.
+ */
+
+static irqreturn_t wdt_interrupt(int irq, void *dev_id)
+{
+	/*
+	 *	Read the status register see what is up and
+	 *	then printk it.
+	 */
+	unsigned char status=inb_p(WDT_SR);
+
+	printk(KERN_CRIT "WDT status %d\n", status);
+
+#ifdef CONFIG_WDT_501
+	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 (tachometer) {
+		if (!(status & WDC_SR_FANGOOD))
+			printk(KERN_CRIT "Possible fan fault.\n");
+	}
+#endif /* CONFIG_WDT_501 */
+	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");
+		emergency_restart();
+#endif
+#else
+		printk(KERN_CRIT "Reset in 5ms.\n");
+#endif
+	return IRQ_HANDLED;
+}
+
+
+/**
+ *	wdt_write:
+ *	@file: file handle to the watchdog
+ *	@buf: buffer to write (unused as data does not matter here
+ *	@count: count of bytes
+ *	@ppos: pointer to the position to write. No seeks allowed
+ *
+ *	A write to a watchdog device is defined as a keepalive signal. Any
+ *	write of data will do, as we we don't define content meaning.
+ */
+
+static ssize_t wdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+	if(count) {
+		if (!nowayout) {
+			size_t i;
+
+			/* In case it was set long ago */
+			expect_close = 0;
+
+			for (i = 0; i != count; i++) {
+				char c;
+				if (get_user(c, buf + i))
+					return -EFAULT;
+				if (c == 'V')
+					expect_close = 42;
+			}
+		}
+		wdt_ping();
+	}
+	return count;
+}
+
+/**
+ *	wdt_ioctl:
+ *	@inode: inode of the device
+ *	@file: file handle to the device
+ *	@cmd: watchdog command
+ *	@arg: argument pointer
+ *
+ *	The watchdog API defines a common set of functions for all watchdogs
+ *	according to their available features. We only actually usefully support
+ *	querying capabilities and current status.
+ */
+
+static int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+	unsigned long arg)
+{
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+	int new_heartbeat;
+	int status;
+
+	static struct watchdog_info ident = {
+		.options =		WDIOF_SETTIMEOUT|
+					WDIOF_MAGICCLOSE|
+					WDIOF_KEEPALIVEPING,
+		.firmware_version =	1,
+		.identity =		"WDT500/501",
+	};
+
+	/* Add options according to the card we have */
+	ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
+#ifdef CONFIG_WDT_501
+	ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER);
+	if (tachometer)
+		ident.options |= WDIOF_FANFAULT;
+#endif /* CONFIG_WDT_501 */
+
+	switch(cmd)
+	{
+		default:
+			return -ENOTTY;
+		case WDIOC_GETSUPPORT:
+			return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
+
+		case WDIOC_GETSTATUS:
+			wdt_get_status(&status);
+			return put_user(status, p);
+		case WDIOC_GETBOOTSTATUS:
+			return put_user(0, p);
+		case WDIOC_KEEPALIVE:
+			wdt_ping();
+			return 0;
+		case WDIOC_SETTIMEOUT:
+			if (get_user(new_heartbeat, p))
+				return -EFAULT;
+
+			if (wdt_set_heartbeat(new_heartbeat))
+				return -EINVAL;
+
+			wdt_ping();
+			/* Fall */
+		case WDIOC_GETTIMEOUT:
+			return put_user(heartbeat, p);
+	}
+}
+
+/**
+ *	wdt_open:
+ *	@inode: inode of device
+ *	@file: file handle to device
+ *
+ *	The watchdog device has been opened. The watchdog device is single
+ *	open and on opening we load the counters. Counter zero is a 100Hz
+ *	cascade, into counter 1 which downcounts to reboot. When the counter
+ *	triggers counter 2 downcounts the length of the reset pulse which
+ *	set set to be as long as possible.
+ */
+
+static int wdt_open(struct inode *inode, struct file *file)
+{
+	if(test_and_set_bit(0, &wdt_is_open))
+		return -EBUSY;
+	/*
+	 *	Activate
+	 */
+	wdt_start();
+	return nonseekable_open(inode, file);
+}
+
+/**
+ *	wdt_release:
+ *	@inode: inode to board
+ *	@file: file handle to board
+ *
+ *	The watchdog has a configurable API. There is a religious dispute
+ *	between people who want their watchdog to be able to shut down and
+ *	those who want to be sure if the watchdog manager dies the machine
+ *	reboots. In the former case we disable the counters, in the latter
+ *	case you have to open it again very soon.
+ */
+
+static int wdt_release(struct inode *inode, struct file *file)
+{
+	if (expect_close == 42) {
+		wdt_stop();
+		clear_bit(0, &wdt_is_open);
+	} else {
+		printk(KERN_CRIT "wdt: WDT device closed unexpectedly.  WDT will not stop!\n");
+		wdt_ping();
+	}
+	expect_close = 0;
+	return 0;
+}
+
+#ifdef CONFIG_WDT_501
+/**
+ *	wdt_temp_read:
+ *	@file: file handle to the watchdog board
+ *	@buf: buffer to write 1 byte into
+ *	@count: length of buffer
+ *	@ptr: offset (no seek allowed)
+ *
+ *	Temp_read reports the temperature in degrees Fahrenheit. The API is in
+ *	farenheit. It was designed by an imperial measurement luddite.
+ */
+
+static ssize_t wdt_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr)
+{
+	int temperature;
+
+	if (wdt_get_temperature(&temperature))
+		return -EFAULT;
+
+	if (copy_to_user (buf, &temperature, 1))
+		return -EFAULT;
+
+	return 1;
+}
+
+/**
+ *	wdt_temp_open:
+ *	@inode: inode of device
+ *	@file: file handle to device
+ *
+ *	The temperature device has been opened.
+ */
+
+static int wdt_temp_open(struct inode *inode, struct file *file)
+{
+	return nonseekable_open(inode, file);
+}
+
+/**
+ *	wdt_temp_release:
+ *	@inode: inode to board
+ *	@file: file handle to board
+ *
+ *	The temperature device has been closed.
+ */
+
+static int wdt_temp_release(struct inode *inode, struct file *file)
+{
+	return 0;
+}
+#endif /* CONFIG_WDT_501 */
+
+/**
+ *	notify_sys:
+ *	@this: our notifier block
+ *	@code: the event being reported
+ *	@unused: unused
+ *
+ *	Our notifier is called on system shutdowns. We want to turn the card
+ *	off at reboot otherwise the machine will reboot again during memory
+ *	test or worse yet during the following fsck. This would suck, in fact
+ *	trust me - if it happens it does suck.
+ */
+
+static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
+	void *unused)
+{
+	if(code==SYS_DOWN || code==SYS_HALT) {
+		/* Turn the card off */
+		wdt_stop();
+	}
+	return NOTIFY_DONE;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+
+static const struct file_operations wdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= wdt_write,
+	.ioctl		= wdt_ioctl,
+	.open		= wdt_open,
+	.release	= wdt_release,
+};
+
+static struct miscdevice wdt_miscdev = {
+	.minor	= WATCHDOG_MINOR,
+	.name	= "watchdog",
+	.fops	= &wdt_fops,
+};
+
+#ifdef CONFIG_WDT_501
+static const struct file_operations wdt_temp_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.read		= wdt_temp_read,
+	.open		= wdt_temp_open,
+	.release	= wdt_temp_release,
+};
+
+static struct miscdevice temp_miscdev = {
+	.minor	= TEMP_MINOR,
+	.name	= "temperature",
+	.fops	= &wdt_temp_fops,
+};
+#endif /* CONFIG_WDT_501 */
+
+/*
+ *	The WDT card needs to learn about soft shutdowns in order to
+ *	turn the timebomb registers off.
+ */
+
+static struct notifier_block wdt_notifier = {
+	.notifier_call = wdt_notify_sys,
+};
+
+/**
+ *	cleanup_module:
+ *
+ *	Unload the watchdog. You cannot do this with any file handles open.
+ *	If your watchdog is set to continue ticking on close and you unload
+ *	it, well it keeps ticking. We won't get the interrupt but the board
+ *	will not touch PC memory so all is fine. You just have to load a new
+ *	module in 60 seconds or reboot.
+ */
+
+static void __exit wdt_exit(void)
+{
+	misc_deregister(&wdt_miscdev);
+#ifdef CONFIG_WDT_501
+	misc_deregister(&temp_miscdev);
+#endif /* CONFIG_WDT_501 */
+	unregister_reboot_notifier(&wdt_notifier);
+	free_irq(irq, NULL);
+	release_region(io,8);
+}
+
+/**
+ * 	wdt_init:
+ *
+ *	Set up the WDT watchdog board. All we have to do is grab the
+ *	resources we require and bitch if anyone beat us to them.
+ *	The open() function will actually kick the board off.
+ */
+
+static int __init wdt_init(void)
+{
+	int ret;
+
+	/* Check that the heartbeat value is within it's range ; if not reset to the default */
+	if (wdt_set_heartbeat(heartbeat)) {
+		wdt_set_heartbeat(WD_TIMO);
+		printk(KERN_INFO "wdt: heartbeat value must be 0<heartbeat<65536, using %d\n",
+			WD_TIMO);
+	}
+
+	if (!request_region(io, 8, "wdt501p")) {
+		printk(KERN_ERR "wdt: I/O address 0x%04x already in use\n", io);
+		ret = -EBUSY;
+		goto out;
+	}
+
+	ret = request_irq(irq, wdt_interrupt, IRQF_DISABLED, "wdt501p", NULL);
+	if(ret) {
+		printk(KERN_ERR "wdt: IRQ %d is not free.\n", irq);
+		goto outreg;
+	}
+
+	ret = register_reboot_notifier(&wdt_notifier);
+	if(ret) {
+		printk(KERN_ERR "wdt: cannot register reboot notifier (err=%d)\n", ret);
+		goto outirq;
+	}
+
+#ifdef CONFIG_WDT_501
+	ret = misc_register(&temp_miscdev);
+	if (ret) {
+		printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n",
+			TEMP_MINOR, ret);
+		goto outrbt;
+	}
+#endif /* CONFIG_WDT_501 */
+
+	ret = misc_register(&wdt_miscdev);
+	if (ret) {
+		printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n",
+			WATCHDOG_MINOR, ret);
+		goto outmisc;
+	}
+
+	ret = 0;
+	printk(KERN_INFO "WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n",
+		io, irq, heartbeat, nowayout);
+#ifdef CONFIG_WDT_501
+	printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled"));
+#endif /* CONFIG_WDT_501 */
+
+out:
+	return ret;
+
+outmisc:
+#ifdef CONFIG_WDT_501
+	misc_deregister(&temp_miscdev);
+outrbt:
+#endif /* CONFIG_WDT_501 */
+	unregister_reboot_notifier(&wdt_notifier);
+outirq:
+	free_irq(irq, NULL);
+outreg:
+	release_region(io,8);
+	goto out;
+}
+
+module_init(wdt_init);
+module_exit(wdt_exit);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+MODULE_ALIAS_MISCDEV(TEMP_MINOR);
+MODULE_LICENSE("GPL");