diff options
Diffstat (limited to 'drivers/char/watchdog/advantechwdt.c')
| -rw-r--r-- | drivers/char/watchdog/advantechwdt.c | 362 |
1 files changed, 0 insertions, 362 deletions
diff --git a/drivers/char/watchdog/advantechwdt.c b/drivers/char/watchdog/advantechwdt.c deleted file mode 100644 index 8121cc24734..00000000000 --- a/drivers/char/watchdog/advantechwdt.c +++ /dev/null @@ -1,362 +0,0 @@ -/* - * Advantech Single Board Computer WDT driver - * - * (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 - * - * 16-Oct-2002 Rob Radez <rob@osinvestor.com> - * Clean up ioctls, clean up init + exit, add expect close support, - * add wdt_start and wdt_stop as parameters. - */ - -#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/platform_device.h> -#include <linux/init.h> - -#include <asm/io.h> -#include <asm/uaccess.h> -#include <asm/system.h> - -#define DRV_NAME "advantechwdt" -#define PFX DRV_NAME ": " -#define WATCHDOG_NAME "Advantech WDT" -#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */ - -static struct platform_device *advwdt_platform_device; /* the watchdog platform device */ -static unsigned long advwdt_is_open; -static char adv_expect_close; - -/* - * You must set these - there is no sane way to probe for this board. - * - * To enable or restart, write the timeout value in seconds (1 to 63) - * to I/O port wdt_start. To disable, read I/O port wdt_stop. - * Both are 0x443 for most boards (tested on a PCA-6276VE-00B1), but - * check your manual (at least the PCA-6159 seems to be different - - * the manual says wdt_stop is 0x43, not 0x443). - * (0x43 is also a write-only control register for the 8254 timer!) - */ - -static int wdt_stop = 0x443; -module_param(wdt_stop, int, 0); -MODULE_PARM_DESC(wdt_stop, "Advantech WDT 'stop' io port (default 0x443)"); - -static int wdt_start = 0x443; -module_param(wdt_start, int, 0); -MODULE_PARM_DESC(wdt_start, "Advantech WDT 'start' io port (default 0x443)"); - -static int timeout = WATCHDOG_TIMEOUT; /* in seconds */ -module_param(timeout, int, 0); -MODULE_PARM_DESC(timeout, "Watchdog timeout in seconds. 1<= timeout <=63, 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) ")"); - -/* - * Watchdog Operations - */ - -static void -advwdt_ping(void) -{ - /* Write a watchdog value */ - outb_p(timeout, wdt_start); -} - -static void -advwdt_disable(void) -{ - inb_p(wdt_stop); -} - -static int -advwdt_set_heartbeat(int t) -{ - if ((t < 1) || (t > 63)) - return -EINVAL; - - timeout = t; - return 0; -} - -/* - * /dev/watchdog handling - */ - -static ssize_t -advwdt_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) -{ - if (count) { - if (!nowayout) { - size_t i; - - adv_expect_close = 0; - - for (i = 0; i != count; i++) { - char c; - if (get_user(c, buf+i)) - return -EFAULT; - if (c == 'V') - adv_expect_close = 42; - } - } - advwdt_ping(); - } - return count; -} - -static int -advwdt_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 = WATCHDOG_NAME, - }; - - 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: - advwdt_ping(); - break; - - case WDIOC_SETTIMEOUT: - if (get_user(new_timeout, p)) - return -EFAULT; - if (advwdt_set_heartbeat(new_timeout)) - return -EINVAL; - advwdt_ping(); - /* 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) { - advwdt_disable(); - retval = 0; - } - - if (options & WDIOS_ENABLECARD) { - advwdt_ping(); - retval = 0; - } - - return retval; - } - - default: - return -ENOTTY; - } - return 0; -} - -static int -advwdt_open(struct inode *inode, struct file *file) -{ - if (test_and_set_bit(0, &advwdt_is_open)) - return -EBUSY; - /* - * Activate - */ - - advwdt_ping(); - return nonseekable_open(inode, file); -} - -static int -advwdt_close(struct inode *inode, struct file *file) -{ - if (adv_expect_close == 42) { - advwdt_disable(); - } else { - printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n"); - advwdt_ping(); - } - clear_bit(0, &advwdt_is_open); - adv_expect_close = 0; - return 0; -} - -/* - * Kernel Interfaces - */ - -static const struct file_operations advwdt_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .write = advwdt_write, - .ioctl = advwdt_ioctl, - .open = advwdt_open, - .release = advwdt_close, -}; - -static struct miscdevice advwdt_miscdev = { - .minor = WATCHDOG_MINOR, - .name = "watchdog", - .fops = &advwdt_fops, -}; - -/* - * Init & exit routines - */ - -static int __devinit -advwdt_probe(struct platform_device *dev) -{ - int ret; - - if (wdt_stop != wdt_start) { - if (!request_region(wdt_stop, 1, WATCHDOG_NAME)) { - printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", - wdt_stop); - ret = -EIO; - goto out; - } - } - - if (!request_region(wdt_start, 1, WATCHDOG_NAME)) { - printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", - wdt_start); - ret = -EIO; - goto unreg_stop; - } - - /* Check that the heartbeat value is within it's range ; if not reset to the default */ - if (advwdt_set_heartbeat(timeout)) { - advwdt_set_heartbeat(WATCHDOG_TIMEOUT); - printk (KERN_INFO PFX "timeout value must be 1<=x<=63, using %d\n", - timeout); - } - - ret = misc_register(&advwdt_miscdev); - if (ret != 0) { - printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", - WATCHDOG_MINOR, ret); - goto unreg_regions; - } - - printk (KERN_INFO PFX "initialized. timeout=%d sec (nowayout=%d)\n", - timeout, nowayout); - -out: - return ret; -unreg_regions: - release_region(wdt_start, 1); -unreg_stop: - if (wdt_stop != wdt_start) - release_region(wdt_stop, 1); - goto out; -} - -static int __devexit -advwdt_remove(struct platform_device *dev) -{ - misc_deregister(&advwdt_miscdev); - release_region(wdt_start,1); - if(wdt_stop != wdt_start) - release_region(wdt_stop,1); - - return 0; -} - -static void -advwdt_shutdown(struct platform_device *dev) -{ - /* Turn the WDT off if we have a soft shutdown */ - advwdt_disable(); -} - -static struct platform_driver advwdt_driver = { - .probe = advwdt_probe, - .remove = __devexit_p(advwdt_remove), - .shutdown = advwdt_shutdown, - .driver = { - .owner = THIS_MODULE, - .name = DRV_NAME, - }, -}; - -static int __init -advwdt_init(void) -{ - int err; - - printk(KERN_INFO "WDT driver for Advantech single board computer initialising.\n"); - - err = platform_driver_register(&advwdt_driver); - if (err) - return err; - - advwdt_platform_device = platform_device_register_simple(DRV_NAME, -1, NULL, 0); - if (IS_ERR(advwdt_platform_device)) { - err = PTR_ERR(advwdt_platform_device); - goto unreg_platform_driver; - } - - return 0; - -unreg_platform_driver: - platform_driver_unregister(&advwdt_driver); - return err; -} - -static void __exit -advwdt_exit(void) -{ - platform_device_unregister(advwdt_platform_device); - platform_driver_unregister(&advwdt_driver); - printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); -} - -module_init(advwdt_init); -module_exit(advwdt_exit); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Marek Michalkiewicz <marekm@linux.org.pl>"); -MODULE_DESCRIPTION("Advantech Single Board Computer WDT driver"); -MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |