diff options
author | Ralf Baechle <ralf@linux-mips.org> | 2000-02-18 00:24:27 +0000 |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2000-02-18 00:24:27 +0000 |
commit | b9558d5f86c471a125abf1fb3a3882fb053b1f8c (patch) | |
tree | 707b53ec64e740a7da87d5f36485e3cd9b1c794e /drivers/char/mixcomwd.c | |
parent | b3ac367c7a3e6047abe74817db27e34e759f279f (diff) |
Merge with Linux 2.3.41.
Diffstat (limited to 'drivers/char/mixcomwd.c')
-rw-r--r-- | drivers/char/mixcomwd.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/drivers/char/mixcomwd.c b/drivers/char/mixcomwd.c new file mode 100644 index 000000000..1bb5a5b7f --- /dev/null +++ b/drivers/char/mixcomwd.c @@ -0,0 +1,250 @@ +/* + * MixCom Watchdog: A Simple Hardware Watchdog Device + * Based on Softdog driver by Alan Cox and PC Watchdog driver by Ken Hollis + * + * Author: Gergely Madarasz <gorgo@itc.hu> + * + * Copyright (c) 1999 ITConsult-Pro Co. <info@itc.hu> + * + * 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. + * + * Version 0.1 (99/04/15): + * - first version + * + * Version 0.2 (99/06/16): + * - added kernel timer watchdog ping after close + * since the hardware does not support watchdog shutdown + * + * Version 0.3 (99/06/21): + * - added WDIOC_GETSTATUS and WDIOC_GETSUPPORT ioctl calls + * + * Version 0.3.1 (99/06/22): + * - allow module removal while internal timer is active, + * print warning about probable reset + * + */ + +#define VERSION "0.3.1" + +#include <linux/module.h> +#include <linux/config.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/miscdevice.h> +#include <linux/ioport.h> +#include <linux/watchdog.h> +#include <linux/reboot.h> +#include <linux/init.h> +#include <asm/uaccess.h> +#include <asm/io.h> + +static int mixcomwd_ioports[] = { 0x180, 0x280, 0x380, 0x000 }; + +#define MIXCOM_WATCHDOG_OFFSET 0xc10 +#define MIXCOM_ID1 0x11 +#define MIXCOM_ID2 0x13 + +static int mixcomwd_opened; +static int mixcomwd_port; + +#ifndef CONFIG_WATCHDOG_NOWAYOUT +static int mixcomwd_timer_alive; +static struct timer_list mixcomwd_timer; +#endif + +static void mixcomwd_ping(void) +{ + outb_p(55,mixcomwd_port+MIXCOM_WATCHDOG_OFFSET); + return; +} + +#ifndef CONFIG_WATCHDOG_NOWAYOUT +static void mixcomwd_timerfun(unsigned long d) +{ + mixcomwd_ping(); + + mod_timer(&mixcomwd_timer,jiffies+ 5*HZ); +} +#endif + +/* + * Allow only one person to hold it open + */ + +static int mixcomwd_open(struct inode *inode, struct file *file) +{ + if(test_and_set_bit(0,&mixcomwd_opened)) { + return -EBUSY; + } + mixcomwd_ping(); + +#ifndef CONFIG_WATCHDOG_NOWAYOUT + if(mixcomwd_timer_alive) { + del_timer(&mixcomwd_timer); + mixcomwd_timer_alive=0; + } +#endif + MOD_INC_USE_COUNT; + + return 0; +} + +static int mixcomwd_release(struct inode *inode, struct file *file) +{ + +#ifndef CONFIG_WATCHDOG_NOWAYOUT + if(mixcomwd_timer_alive) { + printk(KERN_ERR "mixcomwd: release called while internal timer alive"); + return -EBUSY; + } + init_timer(&mixcomwd_timer); + mixcomwd_timer.expires=jiffies + 5 * HZ; + mixcomwd_timer.function=mixcomwd_timerfun; + mixcomwd_timer.data=0; + mixcomwd_timer_alive=1; + add_timer(&mixcomwd_timer); +#endif + MOD_DEC_USE_COUNT; + + clear_bit(0,&mixcomwd_opened); + return 0; +} + + +static ssize_t mixcomwd_write(struct file *file, const char *data, size_t len, loff_t *ppos) +{ + if (ppos != &file->f_pos) { + return -ESPIPE; + } + + if(len) + { + mixcomwd_ping(); + return 1; + } + return 0; +} + +static int mixcomwd_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + int status; + static struct watchdog_info ident = { + WDIOF_KEEPALIVEPING, 1, "MixCOM watchdog" + }; + + switch(cmd) + { + case WDIOC_GETSTATUS: + status=mixcomwd_opened; +#ifndef CONFIG_WATCHDOG_NOWAYOUT + status|=mixcomwd_timer_alive; +#endif + if (copy_to_user((int *)arg, &status, sizeof(int))) { + return -EFAULT; + } + break; + case WDIOC_GETSUPPORT: + if (copy_to_user((struct watchdog_info *)arg, &ident, + sizeof(ident))) { + return -EFAULT; + } + break; + case WDIOC_KEEPALIVE: + mixcomwd_ping(); + break; + default: + return -ENOIOCTLCMD; + } + return 0; +} + +static struct file_operations mixcomwd_fops= +{ + NULL, /* Seek */ + NULL, /* Read */ + mixcomwd_write, /* Write */ + NULL, /* Readdir */ + NULL, /* Select */ + mixcomwd_ioctl, /* Ioctl */ + NULL, /* MMap */ + mixcomwd_open, + NULL, /* flush */ + mixcomwd_release, + NULL, + NULL /* Fasync */ +}; + +static struct miscdevice mixcomwd_miscdev= +{ + WATCHDOG_MINOR, + "watchdog", + &mixcomwd_fops +}; + +static int __init mixcomwd_checkcard(int port) +{ + int id; + + if(check_region(port,1)) { + return 0; + } + + id=inb_p(port + MIXCOM_WATCHDOG_OFFSET) & 0x3f; + if(id!=MIXCOM_ID1 && id!=MIXCOM_ID2) { + return 0; + } + return 1; +} + + +void __init mixcomwd_init(void) +{ + int i; + int found=0; + + for (i = 0; mixcomwd_ioports[i] != 0; i++) { + if (mixcomwd_checkcard(mixcomwd_ioports[i])) { + found = 1; + mixcomwd_port = mixcomwd_ioports[i]; + break; + } + } + + if (!found) { + printk("mixcomwd: No card detected, or port not available.\n"); + return; + } + + request_region(mixcomwd_port+MIXCOM_WATCHDOG_OFFSET,1,"MixCOM watchdog"); + + misc_register(&mixcomwd_miscdev); + printk("MixCOM watchdog driver v%s, MixCOM card at 0x%3x\n",VERSION,mixcomwd_port); +} + +#ifdef MODULE +int init_module(void) +{ + mixcomwd_init(); + return 0; +} + +void cleanup_module(void) +{ +#ifndef CONFIG_WATCHDOG_NOWAYOUT + if(mixcomwd_timer_alive) { + printk(KERN_WARNING "mixcomwd: I quit now, hardware will" + " probably reboot!\n"); + del_timer(&mixcomwd_timer); + mixcomwd_timer_alive=0; + } +#endif + release_region(mixcomwd_port+MIXCOM_WATCHDOG_OFFSET,1); + misc_deregister(&mixcomwd_miscdev); +} +#endif |