314 lines
7.1 KiB
C
314 lines
7.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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* 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
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* 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define VERSION "0.6"
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#define WATCHDOG_NAME "mixcomwd"
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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 <linux/uaccess.h>
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#include <linux/io.h>
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/*
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* We have two types of cards that can be probed:
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* 1) The Mixcom cards: these cards can be found at addresses
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* 0x180, 0x280, 0x380 with an additional offset of 0xc10.
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* (Or 0xd90, 0xe90, 0xf90).
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* 2) The FlashCOM cards: these cards can be set up at
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* 0x300 -> 0x378, in 0x8 jumps with an offset of 0x04.
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* (Or 0x304 -> 0x37c in 0x8 jumps).
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* Each card has it's own ID.
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*/
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#define MIXCOM_ID 0x11
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#define FLASHCOM_ID 0x18
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static struct {
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int ioport;
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int id;
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} mixcomwd_io_info[] = {
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/* The Mixcom cards */
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{0x0d90, MIXCOM_ID},
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{0x0e90, MIXCOM_ID},
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{0x0f90, MIXCOM_ID},
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/* The FlashCOM cards */
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{0x0304, FLASHCOM_ID},
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{0x030c, FLASHCOM_ID},
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{0x0314, FLASHCOM_ID},
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{0x031c, FLASHCOM_ID},
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{0x0324, FLASHCOM_ID},
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{0x032c, FLASHCOM_ID},
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{0x0334, FLASHCOM_ID},
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{0x033c, FLASHCOM_ID},
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{0x0344, FLASHCOM_ID},
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{0x034c, FLASHCOM_ID},
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{0x0354, FLASHCOM_ID},
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{0x035c, FLASHCOM_ID},
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{0x0364, FLASHCOM_ID},
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{0x036c, FLASHCOM_ID},
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{0x0374, FLASHCOM_ID},
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{0x037c, FLASHCOM_ID},
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/* The end of the list */
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{0x0000, 0},
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};
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static void mixcomwd_timerfun(struct timer_list *unused);
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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);
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static char expect_close;
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__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(struct timer_list *unused)
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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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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 stream_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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pr_err("release called while internal timer alive\n");
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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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pr_crit("WDT device closed unexpectedly. WDT will not stop!\n");
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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,
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size_t len, loff_t *ppos)
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{
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if (len) {
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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 long mixcomwd_ioctl(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 const 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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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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break;
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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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return put_user(status, p);
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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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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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = mixcomwd_write,
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.unlocked_ioctl = mixcomwd_ioctl,
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.compat_ioctl = compat_ptr_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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.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 checkcard(int port, int card_id)
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{
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int id;
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if (!request_region(port, 1, "MixCOM watchdog"))
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return 0;
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id = inb_p(port);
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if (card_id == MIXCOM_ID)
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id &= 0x3f;
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if (id != card_id) {
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release_region(port, 1);
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return 0;
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}
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return 1;
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}
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static int __init mixcomwd_init(void)
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{
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int i, ret, found = 0;
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for (i = 0; !found && mixcomwd_io_info[i].ioport != 0; i++) {
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if (checkcard(mixcomwd_io_info[i].ioport,
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mixcomwd_io_info[i].id)) {
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found = 1;
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watchdog_port = mixcomwd_io_info[i].ioport;
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}
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}
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if (!found) {
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pr_err("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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pr_err("cannot register miscdev on minor=%d (err=%d)\n",
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WATCHDOG_MINOR, ret);
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goto error_misc_register_watchdog;
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}
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pr_info("MixCOM watchdog driver v%s, watchdog port at 0x%3x\n",
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VERSION, watchdog_port);
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return 0;
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error_misc_register_watchdog:
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release_region(watchdog_port, 1);
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watchdog_port = 0x0000;
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return ret;
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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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pr_warn("I quit now, hardware will 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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misc_deregister(&mixcomwd_miscdev);
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release_region(watchdog_port, 1);
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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_VERSION(VERSION);
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MODULE_LICENSE("GPL");
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