diff options
author | Ralf Baechle <ralf@linux-mips.org> | 1997-09-12 01:29:55 +0000 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 1997-09-12 01:29:55 +0000 |
commit | 545f435ebcfd94a1e7c20b46efe81b4d6ac4e698 (patch) | |
tree | e9ce4bc598d06374bda906f18365984bf22a526a /drivers/char/acquirewdt.c | |
parent | 4291a610eef89d0d5c69d9a10ee6560e1aa36c74 (diff) |
Merge with Linux 2.1.55. More bugfixes and goodies from my private
CVS archive.
Diffstat (limited to 'drivers/char/acquirewdt.c')
-rw-r--r-- | drivers/char/acquirewdt.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/drivers/char/acquirewdt.c b/drivers/char/acquirewdt.c new file mode 100644 index 000000000..aeb7b72fc --- /dev/null +++ b/drivers/char/acquirewdt.c @@ -0,0 +1,221 @@ +/* + * Acquire Single Board Computer Watchdog Timer driver for Linux 2.1.x + * + * Based on wdt.c. Original copyright messages: + * + * (c) Copyright 1996 Alan Cox <alan@cymru.net>, All Rights Reserved. + * http://www.cymru.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. + * + * 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/config.h> +#include <linux/module.h> +#include <linux/version.h> +#include <linux/types.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/miscdevice.h> +#include <linux/watchdog.h> +#include <linux/malloc.h> +#include <linux/ioport.h> +#include <linux/fcntl.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/system.h> +#include <linux/notifier.h> +#include <linux/reboot.h> +#include <linux/init.h> + +static int acq_is_open=0; + +/* + * You must set these - there is no sane way to probe for this board. + */ + +#define WDT_STOP 0x43 +#define WDT_START 0x443 +#define WATCHDOG_MINOR 130 + +#define WD_TIMO (100*60) /* 1 minute */ + + +/* + * Kernel methods. + */ + + +static void acq_ping(void) +{ + /* Write a watchdog value */ + inb_p(WDT_START); +} + +static long acq_write(struct inode *inode, struct file *file, const char *buf, unsigned long count) +{ + if(count) + { + acq_ping(); + return 1; + } + return 0; +} + +static long acq_read(struct inode *inode, struct file *file, char *buf, unsigned long count) +{ + return -EINVAL; +} + + + +static int acq_ioctl(struct inode *inode, struct file *file, unsigned int cmd, + unsigned long arg) +{ + static struct watchdog_info ident= + { + WDIOF_KEEPALIVEPING, 1, "Acquire WDT" + }; + + switch(cmd) + { + case WDIOC_GETSUPPORT: + if (copy_to_user((struct watchdog_info *)arg, &ident, sizeof(ident))) + return -EFAULT; + break; + + case WDIOC_GETSTATUS: + if (copy_to_user((int *)arg, &acq_is_open, sizeof(int))) + return -EFAULT; + break; + + case WDIOC_KEEPALIVE: + acq_ping(); + break; + + default: + return -ENOIOCTLCMD; + } + return 0; +} + +static int acq_open(struct inode *inode, struct file *file) +{ + switch(MINOR(inode->i_rdev)) + { + case WATCHDOG_MINOR: + if(acq_is_open) + return -EBUSY; + MOD_INC_USE_COUNT; + /* + * Activate + */ + + acq_is_open=1; + inb_p(WDT_START); + return 0; + default: + return -ENODEV; + } +} + +static int acq_close(struct inode *inode, struct file *file) +{ + if(MINOR(inode->i_rdev)==WATCHDOG_MINOR) + { +#ifndef CONFIG_WATCHDOG_NOWAYOUT + inb_p(WDT_STOP); +#endif + acq_is_open=0; + } + MOD_DEC_USE_COUNT; + return 0; +} + +/* + * Notifier for system down + */ + +static int acq_notify_sys(struct notifier_block *this, unsigned long code, + void *unused) +{ + if(code==SYS_DOWN || code==SYS_HALT) + { + /* Turn the card off */ + inb_p(WDT_STOP); + } + return NOTIFY_DONE; +} + +/* + * Kernel Interfaces + */ + + +static struct file_operations acq_fops = { + NULL, + acq_read, + acq_write, + NULL, /* No Readdir */ + NULL, /* No Select */ + acq_ioctl, + NULL, /* No mmap */ + acq_open, + acq_close +}; + +static struct miscdevice acq_miscdev= +{ + WATCHDOG_MINOR, + "Acquire WDT", + &acq_fops +}; + + +/* + * The WDT card needs to learn about soft shutdowns in order to + * turn the timebomb registers off. + */ + +static struct notifier_block acq_notifier= +{ + acq_notify_sys, + NULL, + 0 +}; + +#ifdef MODULE + +#define acq_init init_module + +void cleanup_module(void) +{ + misc_deregister(&acq_miscdev); + unregister_reboot_notifier(&acq_notifier); + release_region(WDT_STOP,1); + release_region(WDT_START,1); +} + +#endif + +__initfunc(int acq_init(void)) +{ + printk("WDT driver for Acquire single board computer initialising.\n"); + + misc_register(&acq_miscdev); + request_region(WDT_STOP, 1, "Acquire WDT"); + request_region(WDT_START, 1, "Acquire WDT"); + unregister_reboot_notifier(&acq_notifier); + return 0; +} + |