diff options
Diffstat (limited to 'drivers/char/watchdog/wafer5823wdt.c')
-rw-r--r-- | drivers/char/watchdog/wafer5823wdt.c | 325 |
1 files changed, 0 insertions, 325 deletions
diff --git a/drivers/char/watchdog/wafer5823wdt.c b/drivers/char/watchdog/wafer5823wdt.c deleted file mode 100644 index 950905d3c39f..000000000000 --- a/drivers/char/watchdog/wafer5823wdt.c +++ /dev/null @@ -1,325 +0,0 @@ -/* - * ICP Wafer 5823 Single Board Computer WDT driver - * http://www.icpamerica.com/wafer_5823.php - * May also work on other similar models - * - * (c) Copyright 2002 Justin Cormack <justin@street-vision.com> - * - * Release 0.02 - * - * Based on advantechwdt.c which is based on wdt.c. - * Original copyright messages: - * - * (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> - * - */ - -#include <linux/module.h> -#include <linux/moduleparam.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 <linux/spinlock.h> -#include <asm/io.h> -#include <asm/uaccess.h> - -#define WATCHDOG_NAME "Wafer 5823 WDT" -#define PFX WATCHDOG_NAME ": " -#define WD_TIMO 60 /* 60 sec default timeout */ - -static unsigned long wafwdt_is_open; -static char expect_close; -static spinlock_t wafwdt_lock; - -/* - * You must set these - there is no sane way to probe for this board. - * - * To enable, write the timeout value in seconds (1 to 255) to I/O - * port WDT_START, then read the port to start the watchdog. To pat - * the dog, read port WDT_STOP to stop the timer, then read WDT_START - * to restart it again. - */ - -static int wdt_stop = 0x843; -static int wdt_start = 0x443; - -static int timeout = WD_TIMO; /* in seconds */ -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=255, 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) ")"); - -static void wafwdt_ping(void) -{ - /* pat watchdog */ - spin_lock(&wafwdt_lock); - inb_p(wdt_stop); - inb_p(wdt_start); - spin_unlock(&wafwdt_lock); -} - -static void wafwdt_start(void) -{ - /* start up watchdog */ - outb_p(timeout, wdt_start); - inb_p(wdt_start); -} - -static void -wafwdt_stop(void) -{ - /* stop watchdog */ - inb_p(wdt_stop); -} - -static ssize_t wafwdt_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 i; - - /* In case it was set long ago */ - expect_close = 0; - - /* scan to see whether or not we got the magic character */ - for (i = 0; i != count; i++) { - char c; - if (get_user(c, buf + i)) - return -EFAULT; - if (c == 'V') - expect_close = 42; - } - } - /* Well, anyhow someone wrote to us, we should return that favour */ - wafwdt_ping(); - } - return count; -} - -static int wafwdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) -{ - int new_timeout; - 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 = "Wafer 5823 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: - wafwdt_ping(); - break; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, p)) - return -EFAULT; - if ((new_timeout < 1) || (new_timeout > 255)) - return -EINVAL; - timeout = new_timeout; - wafwdt_stop(); - wafwdt_start(); - /* Fall */ - case WDIOC_GETTIMEOUT: - return put_user(timeout, p); - - case WDIOC_SETOPTIONS: - { - int options, retval = -EINVAL; - - if (get_user(options, p)) - return -EFAULT; - - if (options & WDIOS_DISABLECARD) { - wafwdt_start(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - wafwdt_stop(); - retval = 0; - } - - return retval; - } - - default: - return -ENOTTY; - } - return 0; -} - -static int wafwdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &wafwdt_is_open)) - return -EBUSY; - - /* - * Activate - */ - wafwdt_start(); - return nonseekable_open(inode, file); -} - -static int -wafwdt_close(struct inode *inode, struct file *file) -{ - if (expect_close == 42) { - wafwdt_stop(); - } else { - printk(KERN_CRIT PFX "WDT device closed unexpectedly. WDT will not stop!\n"); - wafwdt_ping(); - } - clear_bit(0, &wafwdt_is_open); - expect_close = 0; - return 0; -} - -/* - * Notifier for system down - */ - -static int wafwdt_notify_sys(struct notifier_block *this, unsigned long code, void *unused) -{ - if (code == SYS_DOWN || code == SYS_HALT) { - /* Turn the WDT off */ - wafwdt_stop(); - } - return NOTIFY_DONE; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations wafwdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = wafwdt_write, - .ioctl = wafwdt_ioctl, - .open = wafwdt_open, - .release = wafwdt_close, -}; - -static struct miscdevice wafwdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &wafwdt_fops, -}; - -/* - * The WDT needs to learn about soft shutdowns in order to - * turn the timebomb registers off. - */ - -static struct notifier_block wafwdt_notifier = { - .notifier_call = wafwdt_notify_sys, -}; - -static int __init wafwdt_init(void) -{ - int ret; - - printk(KERN_INFO "WDT driver for Wafer 5823 single board computer initialising.\n"); - - spin_lock_init(&wafwdt_lock); - - if (timeout < 1 || timeout > 255) { - timeout = WD_TIMO; - printk (KERN_INFO PFX "timeout value must be 1<=x<=255, using %d\n", - timeout); - } - - if (wdt_stop != wdt_start) { - if(!request_region(wdt_stop, 1, "Wafer 5823 WDT")) { - printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", - wdt_stop); - ret = -EIO; - goto error; - } - } - - if(!request_region(wdt_start, 1, "Wafer 5823 WDT")) { - printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", - wdt_start); - ret = -EIO; - goto error2; - } - - ret = register_reboot_notifier(&wafwdt_notifier); - if (ret != 0) { - printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", - ret); - goto error3; - } - - ret = misc_register(&wafwdt_miscdev); - if (ret != 0) { - printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto error4; - } - - printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n", - timeout, nowayout); - - return ret; -error4: - unregister_reboot_notifier(&wafwdt_notifier); -error3: - release_region(wdt_start, 1); -error2: - if (wdt_stop != wdt_start) - release_region(wdt_stop, 1); -error: - return ret; -} - -static void __exit wafwdt_exit(void) -{ - misc_deregister(&wafwdt_miscdev); - unregister_reboot_notifier(&wafwdt_notifier); - if(wdt_stop != wdt_start) - release_region(wdt_stop, 1); - release_region(wdt_start, 1); -} - -module_init(wafwdt_init); -module_exit(wafwdt_exit); - -MODULE_AUTHOR("Justin Cormack"); -MODULE_DESCRIPTION("ICP Wafer 5823 Single Board Computer WDT driver"); -MODULE_LICENSE("GPL"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); - -/* end of wafer5823wdt.c */ |