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path: root/drivers/char/watchdog/w83877f_wdt.c
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Diffstat (limited to 'drivers/char/watchdog/w83877f_wdt.c')
-rw-r--r--drivers/char/watchdog/w83877f_wdt.c415
1 files changed, 0 insertions, 415 deletions
diff --git a/drivers/char/watchdog/w83877f_wdt.c b/drivers/char/watchdog/w83877f_wdt.c
deleted file mode 100644
index 3c88fe18f4f..00000000000
--- a/drivers/char/watchdog/w83877f_wdt.c
+++ /dev/null
@@ -1,415 +0,0 @@
-/*
- * W83877F Computer Watchdog Timer driver
- *
- * Based on acquirewdt.c by Alan Cox,
- * 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 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
- * 4/12 - 2002 [rob@osinvestor.com] Eliminate extra comments
- * Eliminate fop_read
- * Eliminate extra spin_unlock
- * Added KERN_* tags to printks
- * add CONFIG_WATCHDOG_NOWAYOUT support
- * fix possible wdt_is_open race
- * changed watchdog_info to correctly reflect what the driver offers
- * added WDIOC_GETSTATUS, WDIOC_GETBOOTSTATUS, WDIOC_SETTIMEOUT,
- * WDIOC_GETTIMEOUT, and WDIOC_SETOPTIONS ioctls
- * 09/8 - 2003 [wim@iguana.be] cleanup of trailing spaces
- * added extra printk's for startup problems
- * use module_param
- * made timeout (the emulated heartbeat) a module_param
- * made the keepalive ping an internal subroutine
- *
- * This WDT driver is different from most other Linux WDT
- * drivers in that the driver will ping the watchdog by itself,
- * because this particular WDT has a very short timeout (1.6
- * seconds) and it would be insane to count on any userspace
- * daemon always getting scheduled within that time frame.
- */
-
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-#include <linux/timer.h>
-#include <linux/jiffies.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>
-
-#define OUR_NAME "w83877f_wdt"
-#define PFX OUR_NAME ": "
-
-#define ENABLE_W83877F_PORT 0x3F0
-#define ENABLE_W83877F 0x87
-#define DISABLE_W83877F 0xAA
-#define WDT_PING 0x443
-#define WDT_REGISTER 0x14
-#define WDT_ENABLE 0x9C
-#define WDT_DISABLE 0x8C
-
-/*
- * The W83877F seems to be fixed at 1.6s timeout (at least on the
- * EMACS PC-104 board I'm using). If we reset the watchdog every
- * ~250ms we should be safe. */
-
-#define WDT_INTERVAL (HZ/4+1)
-
-/*
- * We must not require too good response from the userspace daemon.
- * Here we require the userspace daemon to send us a heartbeat
- * char to /dev/watchdog every 30 seconds.
- */
-
-#define WATCHDOG_TIMEOUT 30 /* 30 sec default timeout */
-static int timeout = WATCHDOG_TIMEOUT; /* in seconds, will be multiplied by HZ to get seconds to wait for a ping */
-module_param(timeout, int, 0);
-MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. (1<=timeout<=3600, default=" __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
-
-
-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) ")");
-
-static void wdt_timer_ping(unsigned long);
-static DEFINE_TIMER(timer, wdt_timer_ping, 0, 0);
-static unsigned long next_heartbeat;
-static unsigned long wdt_is_open;
-static char wdt_expect_close;
-static spinlock_t wdt_spinlock;
-
-/*
- * Whack the dog
- */
-
-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
- */
- if(time_before(jiffies, next_heartbeat))
- {
- /* Ping the WDT */
- spin_lock(&wdt_spinlock);
-
- /* Ping the WDT by reading from WDT_PING */
- inb_p(WDT_PING);
-
- /* Re-set the timer interval */
- mod_timer(&timer, jiffies + WDT_INTERVAL);
-
- spin_unlock(&wdt_spinlock);
-
- } else {
- printk(KERN_WARNING PFX "Heartbeat lost! Will not ping the watchdog\n");
- }
-}
-
-/*
- * Utility routines
- */
-
-static void wdt_change(int writeval)
-{
- unsigned long flags;
- spin_lock_irqsave(&wdt_spinlock, flags);
-
- /* buy some time */
- inb_p(WDT_PING);
-
- /* make W83877F available */
- outb_p(ENABLE_W83877F, ENABLE_W83877F_PORT);
- outb_p(ENABLE_W83877F, ENABLE_W83877F_PORT);
-
- /* enable watchdog */
- outb_p(WDT_REGISTER, ENABLE_W83877F_PORT);
- outb_p(writeval, ENABLE_W83877F_PORT+1);
-
- /* lock the W8387FF away */
- outb_p(DISABLE_W83877F, ENABLE_W83877F_PORT);
-
- spin_unlock_irqrestore(&wdt_spinlock, flags);
-}
-
-static void wdt_startup(void)
-{
- next_heartbeat = jiffies + (timeout * HZ);
-
- /* Start the timer */
- mod_timer(&timer, jiffies + WDT_INTERVAL);
-
- wdt_change(WDT_ENABLE);
-
- printk(KERN_INFO PFX "Watchdog timer is now enabled.\n");
-}
-
-static void wdt_turnoff(void)
-{
- /* Stop the timer */
- del_timer(&timer);
-
- wdt_change(WDT_DISABLE);
-
- printk(KERN_INFO PFX "Watchdog timer is now disabled...\n");
-}
-
-static void wdt_keepalive(void)
-{
- /* user land ping */
- next_heartbeat = jiffies + (timeout * HZ);
-}
-
-/*
- * /dev/watchdog handling
- */
-
-static ssize_t fop_write(struct file * file, const char __user * buf, size_t count, loff_t * ppos)
-{
- /* See if we got the magic character 'V' and reload the timer */
- if(count)
- {
- if (!nowayout)
- {
- size_t ofs;
-
- /* note: just in case someone wrote the magic character
- * five months ago... */
- wdt_expect_close = 0;
-
- /* scan to see whether or not we got the magic character */
- for(ofs = 0; ofs != count; ofs++)
- {
- char c;
- if (get_user(c, buf + ofs))
- return -EFAULT;
- if (c == 'V')
- wdt_expect_close = 42;
- }
- }
-
- /* someone wrote to us, we should restart timer */
- wdt_keepalive();
- }
- return count;
-}
-
-static int fop_open(struct inode * inode, struct file * file)
-{
- /* Just in case we're already talking to someone... */
- if(test_and_set_bit(0, &wdt_is_open))
- return -EBUSY;
-
- /* Good, fire up the show */
- wdt_startup();
- return nonseekable_open(inode, file);
-}
-
-static int fop_close(struct inode * inode, struct file * file)
-{
- if(wdt_expect_close == 42)
- wdt_turnoff();
- else {
- del_timer(&timer);
- printk(KERN_CRIT PFX "device file closed unexpectedly. Will not stop the WDT!\n");
- }
- clear_bit(0, &wdt_is_open);
- wdt_expect_close = 0;
- return 0;
-}
-
-static int fop_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- 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 = "W83877F",
- };
-
- switch(cmd)
- {
- default:
- return -ENOTTY;
- case WDIOC_GETSUPPORT:
- return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0;
- case WDIOC_GETSTATUS:
- case WDIOC_GETBOOTSTATUS:
- return put_user(0, p);
- case WDIOC_KEEPALIVE:
- wdt_keepalive();
- return 0;
- case WDIOC_SETOPTIONS:
- {
- int new_options, retval = -EINVAL;
-
- if(get_user(new_options, p))
- return -EFAULT;
-
- if(new_options & WDIOS_DISABLECARD) {
- wdt_turnoff();
- retval = 0;
- }
-
- if(new_options & WDIOS_ENABLECARD) {
- wdt_startup();
- retval = 0;
- }
-
- return retval;
- }
- case WDIOC_SETTIMEOUT:
- {
- int new_timeout;
-
- if(get_user(new_timeout, p))
- return -EFAULT;
-
- if(new_timeout < 1 || new_timeout > 3600) /* arbitrary upper limit */
- return -EINVAL;
-
- timeout = new_timeout;
- wdt_keepalive();
- /* Fall through */
- }
- case WDIOC_GETTIMEOUT:
- return put_user(timeout, p);
- }
-}
-
-static const struct file_operations wdt_fops = {
- .owner = THIS_MODULE,
- .llseek = no_llseek,
- .write = fop_write,
- .open = fop_open,
- .release = fop_close,
- .ioctl = fop_ioctl,
-};
-
-static struct miscdevice wdt_miscdev = {
- .minor = WATCHDOG_MINOR,
- .name = "watchdog",
- .fops = &wdt_fops,
-};
-
-/*
- * Notifier for system down
- */
-
-static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
- void *unused)
-{
- 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.
- */
-
-static struct notifier_block wdt_notifier=
-{
- .notifier_call = wdt_notify_sys,
-};
-
-static void __exit w83877f_wdt_unload(void)
-{
- wdt_turnoff();
-
- /* Deregister */
- misc_deregister(&wdt_miscdev);
-
- unregister_reboot_notifier(&wdt_notifier);
- release_region(WDT_PING,1);
- release_region(ENABLE_W83877F_PORT,2);
-}
-
-static int __init w83877f_wdt_init(void)
-{
- int rc = -EBUSY;
-
- spin_lock_init(&wdt_spinlock);
-
- if(timeout < 1 || timeout > 3600) /* arbitrary upper limit */
- {
- timeout = WATCHDOG_TIMEOUT;
- printk(KERN_INFO PFX "timeout value must be 1<=x<=3600, using %d\n",
- timeout);
- }
-
- 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;
- }
-
- 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. timeout=%d sec (nowayout=%d)\n",
- timeout, nowayout);
-
- return 0;
-
-err_out_miscdev:
- misc_deregister(&wdt_miscdev);
-err_out_region2:
- release_region(WDT_PING,1);
-err_out_region1:
- release_region(ENABLE_W83877F_PORT,2);
-err_out:
- return rc;
-}
-
-module_init(w83877f_wdt_init);
-module_exit(w83877f_wdt_unload);
-
-MODULE_AUTHOR("Scott and Bill Jennings");
-MODULE_DESCRIPTION("Driver for watchdog timer in w83877f chip");
-MODULE_LICENSE("GPL");
-MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-30 04:14:15 +0000