mv watchdog tree under drivers

move watchdog tree from drivers/char/watchdog to drivers/watchdog.

Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 408 insertions, 0 deletions

diff --git a/drivers/watchdog/ib700wdt.c b/drivers/watchdog/ib700wdt.c
new file mode 100644
index 000000000000..c3a60f52ccb9
--- /dev/null
+++ b/drivers/watchdog/ib700wdt.c
@@ -0,0 +1,408 @@
+/*
+ *	IB700 Single Board Computer WDT driver
+ *
+ *	(c) Copyright 2001 Charles Howes <chowes@vsol.net>
+ *
+ *	Based on advantechwdt.c which is based on acquirewdt.c which
+ *	is based on wdt.c.
+ *
+ *	(c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
+ *
+ *	Based on acquirewdt.c which is based on wdt.c.
+ *	Original copyright messages:
+ *
+ *	(c) Copyright 1996 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@redhat.com>
+ *
+ *	14-Dec-2001 Matt Domsch <Matt_Domsch@dell.com>
+ *	     Added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
+ *	     Added timeout module option to override default
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/ioport.h>
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/moduleparam.h>
+#include <linux/platform_device.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+static struct platform_device *ibwdt_platform_device;
+static unsigned long ibwdt_is_open;
+static spinlock_t ibwdt_lock;
+static char expect_close;
+
+/* Module information */
+#define DRV_NAME "ib700wdt"
+#define PFX DRV_NAME ": "
+
+/*
+ *
+ * Watchdog Timer Configuration
+ *
+ * The function of the watchdog timer is to reset the system
+ * automatically and is defined at I/O port 0443H.  To enable the
+ * watchdog timer and allow the system to reset, write I/O port 0443H.
+ * To disable the timer, write I/O port 0441H for the system to stop the
+ * watchdog function.  The timer has a tolerance of 20% for its
+ * intervals.
+ *
+ * The following describes how the timer should be programmed.
+ *
+ * Enabling Watchdog:
+ * MOV AX,000FH (Choose the values from 0 to F)
+ * MOV DX,0443H
+ * OUT DX,AX
+ *
+ * Disabling Watchdog:
+ * MOV AX,000FH (Any value is fine.)
+ * MOV DX,0441H
+ * OUT DX,AX
+ *
+ * Watchdog timer control table:
+ * Level   Value  Time/sec | Level Value Time/sec
+ *   1       F       0     |   9     7      16
+ *   2       E       2     |   10    6      18
+ *   3       D       4     |   11    5      20
+ *   4       C       6     |   12    4      22
+ *   5       B       8     |   13    3      24
+ *   6       A       10    |   14    2      26
+ *   7       9       12    |   15    1      28
+ *   8       8       14    |   16    0      30
+ *
+ */
+
+static int wd_times[] = {
+	30,	/* 0x0 */
+	28,	/* 0x1 */
+	26,	/* 0x2 */
+	24,	/* 0x3 */
+	22,	/* 0x4 */
+	20,	/* 0x5 */
+	18,	/* 0x6 */
+	16,	/* 0x7 */
+	14,	/* 0x8 */
+	12,	/* 0x9 */
+	10,	/* 0xA */
+	8,	/* 0xB */
+	6,	/* 0xC */
+	4,	/* 0xD */
+	2,	/* 0xE */
+	0,	/* 0xF */
+};
+
+#define WDT_STOP 0x441
+#define WDT_START 0x443
+
+/* Default timeout */
+#define WD_TIMO 0		/* 30 seconds +/- 20%, from table */
+
+static int wd_margin = 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) ")");
+
+
+/*
+ *	Watchdog Operations
+ */
+
+static void
+ibwdt_ping(void)
+{
+	spin_lock(&ibwdt_lock);
+
+	/* Write a watchdog value */
+	outb_p(wd_margin, WDT_START);
+
+	spin_unlock(&ibwdt_lock);
+}
+
+static void
+ibwdt_disable(void)
+{
+	spin_lock(&ibwdt_lock);
+	outb_p(0, WDT_STOP);
+	spin_unlock(&ibwdt_lock);
+}
+
+static int
+ibwdt_set_heartbeat(int t)
+{
+	int i;
+
+	if ((t < 0) || (t > 30))
+		return -EINVAL;
+
+	for (i = 0x0F; i > -1; i--)
+		if (wd_times[i] > t)
+			break;
+	wd_margin = i;
+	return 0;
+}
+
+/*
+ *	/dev/watchdog handling
+ */
+
+static ssize_t
+ibwdt_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;
+			}
+		}
+		ibwdt_ping();
+	}
+	return count;
+}
+
+static int
+ibwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
+	  unsigned long arg)
+{
+	int new_margin;
+	void __user *argp = (void __user *)arg;
+	int __user *p = argp;
+
+	static struct watchdog_info ident = {
+		.options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE,
+		.firmware_version = 1,
+		.identity = "IB700 WDT",
+	};
+
+	switch (cmd) {
+	case WDIOC_GETSUPPORT:
+	  if (copy_to_user(argp, &ident, sizeof(ident)))
+	    return -EFAULT;
+	  break;
+
+	case WDIOC_GETSTATUS:
+	case WDIOC_GETBOOTSTATUS:
+	  return put_user(0, p);
+
+	case WDIOC_KEEPALIVE:
+	  ibwdt_ping();
+	  break;
+
+	case WDIOC_SETTIMEOUT:
+	  if (get_user(new_margin, p))
+		  return -EFAULT;
+	  if (ibwdt_set_heartbeat(new_margin))
+		  return -EINVAL;
+	  ibwdt_ping();
+	  /* Fall */
+
+	case WDIOC_GETTIMEOUT:
+	  return put_user(wd_times[wd_margin], p);
+
+	case WDIOC_SETOPTIONS:
+	{
+	  int options, retval = -EINVAL;
+
+	  if (get_user(options, p))
+	    return -EFAULT;
+
+	  if (options & WDIOS_DISABLECARD) {
+	    ibwdt_disable();
+	    retval = 0;
+	  }
+
+	  if (options & WDIOS_ENABLECARD) {
+	    ibwdt_ping();
+	    retval = 0;
+	  }
+
+	  return retval;
+	}
+
+	default:
+	  return -ENOTTY;
+	}
+	return 0;
+}
+
+static int
+ibwdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(0, &ibwdt_is_open)) {
+		return -EBUSY;
+	}
+	if (nowayout)
+		__module_get(THIS_MODULE);
+
+	/* Activate */
+	ibwdt_ping();
+	return nonseekable_open(inode, file);
+}
+
+static int
+ibwdt_close(struct inode *inode, struct file *file)
+{
+	if (expect_close == 42) {
+		ibwdt_disable();
+	} else {
+		printk(KERN_CRIT PFX "WDT device closed unexpectedly.  WDT will not stop!\n");
+		ibwdt_ping();
+	}
+	clear_bit(0, &ibwdt_is_open);
+	expect_close = 0;
+	return 0;
+}
+
+/*
+ *	Kernel Interfaces
+ */
+
+static const struct file_operations ibwdt_fops = {
+	.owner		= THIS_MODULE,
+	.llseek		= no_llseek,
+	.write		= ibwdt_write,
+	.ioctl		= ibwdt_ioctl,
+	.open		= ibwdt_open,
+	.release	= ibwdt_close,
+};
+
+static struct miscdevice ibwdt_miscdev = {
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &ibwdt_fops,
+};
+
+/*
+ *	Init & exit routines
+ */
+
+static int __devinit ibwdt_probe(struct platform_device *dev)
+{
+	int res;
+
+	spin_lock_init(&ibwdt_lock);
+
+#if WDT_START != WDT_STOP
+	if (!request_region(WDT_STOP, 1, "IB700 WDT")) {
+		printk (KERN_ERR PFX "STOP method I/O %X is not available.\n", WDT_STOP);
+		res = -EIO;
+		goto out_nostopreg;
+	}
+#endif
+
+	if (!request_region(WDT_START, 1, "IB700 WDT")) {
+		printk (KERN_ERR PFX "START method I/O %X is not available.\n", WDT_START);
+		res = -EIO;
+		goto out_nostartreg;
+	}
+
+	res = misc_register(&ibwdt_miscdev);
+	if (res) {
+		printk (KERN_ERR PFX "failed to register misc device\n");
+		goto out_nomisc;
+	}
+	return 0;
+
+out_nomisc:
+	release_region(WDT_START, 1);
+out_nostartreg:
+#if WDT_START != WDT_STOP
+	release_region(WDT_STOP, 1);
+#endif
+out_nostopreg:
+	return res;
+}
+
+static int __devexit ibwdt_remove(struct platform_device *dev)
+{
+	misc_deregister(&ibwdt_miscdev);
+	release_region(WDT_START,1);
+#if WDT_START != WDT_STOP
+	release_region(WDT_STOP,1);
+#endif
+	return 0;
+}
+
+static void ibwdt_shutdown(struct platform_device *dev)
+{
+	/* Turn the WDT off if we have a soft shutdown */
+	ibwdt_disable();
+}
+
+static struct platform_driver ibwdt_driver = {
+	.probe		= ibwdt_probe,
+	.remove		= __devexit_p(ibwdt_remove),
+	.shutdown	= ibwdt_shutdown,
+	.driver		= {
+		.owner	= THIS_MODULE,
+		.name	= DRV_NAME,
+	},
+};
+
+static int __init ibwdt_init(void)
+{
+	int err;
+
+	printk(KERN_INFO PFX "WDT driver for IB700 single board computer initialising.\n");
+
+	err = platform_driver_register(&ibwdt_driver);
+	if (err)
+		return err;
+
+	ibwdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0);
+	if (IS_ERR(ibwdt_platform_device)) {
+		err = PTR_ERR(ibwdt_platform_device);
+		goto unreg_platform_driver;
+	}
+
+	return 0;
+
+unreg_platform_driver:
+	platform_driver_unregister(&ibwdt_driver);
+	return err;
+}
+
+static void __exit ibwdt_exit(void)
+{
+	platform_device_unregister(ibwdt_platform_device);
+	platform_driver_unregister(&ibwdt_driver);
+	printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
+}
+
+module_init(ibwdt_init);
+module_exit(ibwdt_exit);
+
+MODULE_AUTHOR("Charles Howes <chowes@vsol.net>");
+MODULE_DESCRIPTION("IB700 SBC watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
+
+/* end of ib700wdt.c */