b10958d338
Robert Radez started cleaning up the mixcomwd driver in 2002. All his changes have been incorporated. Since he owns that credit -> document it correctly. Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
306 lines
6.7 KiB
C
306 lines
6.7 KiB
C
/*
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* MixCom Watchdog: A Simple Hardware Watchdog Device
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* Based on Softdog driver by Alan Cox and PC Watchdog driver by Ken Hollis
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*
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* Author: Gergely Madarasz <gorgo@itc.hu>
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*
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* Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Version 0.1 (99/04/15):
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* - first version
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*
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* Version 0.2 (99/06/16):
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* - added kernel timer watchdog ping after close
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* since the hardware does not support watchdog shutdown
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*
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* Version 0.3 (99/06/21):
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* - added WDIOC_GETSTATUS and WDIOC_GETSUPPORT ioctl calls
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*
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* Version 0.3.1 (99/06/22):
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* - allow module removal while internal timer is active,
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* print warning about probable reset
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*
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* Version 0.4 (99/11/15):
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* - support for one more type board
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*
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* Version 0.5 (2001/12/14) Matt Domsch <Matt_Domsch@dell.com>
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* - added nowayout module option to override CONFIG_WATCHDOG_NOWAYOUT
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*
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* Version 0.6 (2002/04/12): Rob Radez <rob@osinvestor.com>
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* - make mixcomwd_opened unsigned,
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* removed lock_kernel/unlock_kernel from mixcomwd_release,
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* modified ioctl a bit to conform to API
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*
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*/
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#define VERSION "0.6"
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/ioport.h>
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#include <linux/watchdog.h>
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#include <linux/fs.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/timer.h>
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#include <asm/uaccess.h>
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#include <asm/io.h>
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static int mixcomwd_ioports[] = { 0x180, 0x280, 0x380, 0x000 };
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#define MIXCOM_WATCHDOG_OFFSET 0xc10
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#define MIXCOM_ID 0x11
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#define FLASHCOM_WATCHDOG_OFFSET 0x4
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#define FLASHCOM_ID 0x18
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static void mixcomwd_timerfun(unsigned long d);
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static unsigned long mixcomwd_opened; /* long req'd for setbit --RR */
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static int watchdog_port;
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static int mixcomwd_timer_alive;
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static DEFINE_TIMER(mixcomwd_timer, mixcomwd_timerfun, 0, 0);
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static char expect_close;
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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static void mixcomwd_ping(void)
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{
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outb_p(55,watchdog_port);
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return;
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}
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static void mixcomwd_timerfun(unsigned long d)
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{
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mixcomwd_ping();
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mod_timer(&mixcomwd_timer, jiffies + 5 * HZ);
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}
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/*
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* Allow only one person to hold it open
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*/
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static int mixcomwd_open(struct inode *inode, struct file *file)
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{
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if(test_and_set_bit(0,&mixcomwd_opened)) {
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return -EBUSY;
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}
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mixcomwd_ping();
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if (nowayout) {
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/*
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* fops_get() code via open() has already done
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* a try_module_get() so it is safe to do the
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* __module_get().
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*/
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__module_get(THIS_MODULE);
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} else {
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if(mixcomwd_timer_alive) {
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del_timer(&mixcomwd_timer);
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mixcomwd_timer_alive=0;
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}
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}
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return nonseekable_open(inode, file);
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}
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static int mixcomwd_release(struct inode *inode, struct file *file)
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{
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if (expect_close == 42) {
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if(mixcomwd_timer_alive) {
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printk(KERN_ERR "mixcomwd: release called while internal timer alive");
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return -EBUSY;
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}
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mixcomwd_timer_alive=1;
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mod_timer(&mixcomwd_timer, jiffies + 5 * HZ);
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} else {
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printk(KERN_CRIT "mixcomwd: WDT device closed unexpectedly. WDT will not stop!\n");
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}
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clear_bit(0,&mixcomwd_opened);
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expect_close=0;
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return 0;
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}
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static ssize_t mixcomwd_write(struct file *file, const char __user *data, size_t len, loff_t *ppos)
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{
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if(len)
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{
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if (!nowayout) {
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size_t i;
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/* In case it was set long ago */
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expect_close = 0;
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for (i = 0; i != len; i++) {
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char c;
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if (get_user(c, data + i))
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return -EFAULT;
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if (c == 'V')
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expect_close = 42;
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}
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}
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mixcomwd_ping();
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}
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return len;
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}
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static int mixcomwd_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int status;
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static struct watchdog_info ident = {
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.options = WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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.firmware_version = 1,
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.identity = "MixCOM watchdog",
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};
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switch(cmd)
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{
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case WDIOC_GETSTATUS:
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status=mixcomwd_opened;
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if (!nowayout) {
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status|=mixcomwd_timer_alive;
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}
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if (copy_to_user(p, &status, sizeof(int))) {
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return -EFAULT;
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}
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break;
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &ident, sizeof(ident))) {
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return -EFAULT;
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}
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break;
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case WDIOC_KEEPALIVE:
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mixcomwd_ping();
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break;
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default:
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return -ENOTTY;
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}
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return 0;
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}
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static const struct file_operations mixcomwd_fops=
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{
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = mixcomwd_write,
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.ioctl = mixcomwd_ioctl,
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.open = mixcomwd_open,
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.release = mixcomwd_release,
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};
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static struct miscdevice mixcomwd_miscdev=
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{
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &mixcomwd_fops,
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};
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static int __init mixcomwd_checkcard(int port)
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{
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int id;
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port += MIXCOM_WATCHDOG_OFFSET;
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if (!request_region(port, 1, "MixCOM watchdog")) {
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return 0;
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}
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id=inb_p(port) & 0x3f;
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if(id!=MIXCOM_ID) {
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release_region(port, 1);
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return 0;
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}
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return port;
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}
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static int __init flashcom_checkcard(int port)
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{
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int id;
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port += FLASHCOM_WATCHDOG_OFFSET;
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if (!request_region(port, 1, "MixCOM watchdog")) {
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return 0;
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}
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id=inb_p(port);
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if(id!=FLASHCOM_ID) {
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release_region(port, 1);
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return 0;
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}
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return port;
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}
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static int __init mixcomwd_init(void)
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{
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int i;
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int ret;
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int found=0;
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for (i = 0; !found && mixcomwd_ioports[i] != 0; i++) {
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watchdog_port = mixcomwd_checkcard(mixcomwd_ioports[i]);
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if (watchdog_port) {
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found = 1;
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}
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}
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/* The FlashCOM card can be set up at 0x300 -> 0x378, in 0x8 jumps */
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for (i = 0x300; !found && i < 0x380; i+=0x8) {
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watchdog_port = flashcom_checkcard(i);
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if (watchdog_port) {
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found = 1;
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}
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}
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if (!found) {
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printk("mixcomwd: No card detected, or port not available.\n");
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return -ENODEV;
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}
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ret = misc_register(&mixcomwd_miscdev);
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if (ret)
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{
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release_region(watchdog_port, 1);
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return ret;
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}
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printk(KERN_INFO "MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",VERSION,watchdog_port);
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return 0;
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}
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static void __exit mixcomwd_exit(void)
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{
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if (!nowayout) {
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if(mixcomwd_timer_alive) {
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printk(KERN_WARNING "mixcomwd: I quit now, hardware will"
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" probably reboot!\n");
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del_timer_sync(&mixcomwd_timer);
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mixcomwd_timer_alive=0;
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}
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}
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release_region(watchdog_port,1);
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misc_deregister(&mixcomwd_miscdev);
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}
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module_init(mixcomwd_init);
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module_exit(mixcomwd_exit);
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MODULE_AUTHOR("Gergely Madarasz <gorgo@itc.hu>");
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MODULE_DESCRIPTION("MixCom Watchdog driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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