2007-11-19 09:09:21 -05:00
|
|
|
/*
|
|
|
|
* IT8712F "Smart Guardian" Watchdog support
|
|
|
|
*
|
|
|
|
* Copyright (c) 2006-2007 Jorge Boncompte - DTI2 <jorge@dti2.net>
|
|
|
|
*
|
|
|
|
* Based on info and code taken from:
|
|
|
|
*
|
|
|
|
* drivers/char/watchdog/scx200_wdt.c
|
|
|
|
* drivers/hwmon/it87.c
|
2008-02-10 22:11:15 -05:00
|
|
|
* IT8712F EC-LPC I/O Preliminary Specification 0.8.2
|
|
|
|
* IT8712F EC-LPC I/O Preliminary Specification 0.9.3
|
2007-11-19 09:09:21 -05:00
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
* The author(s) of this software shall not be held liable for damages
|
|
|
|
* of any nature resulting due to the use of this software. This
|
|
|
|
* software is provided AS-IS with no warranties.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/module.h>
|
|
|
|
#include <linux/moduleparam.h>
|
|
|
|
#include <linux/init.h>
|
|
|
|
#include <linux/miscdevice.h>
|
|
|
|
#include <linux/watchdog.h>
|
|
|
|
#include <linux/notifier.h>
|
|
|
|
#include <linux/reboot.h>
|
|
|
|
#include <linux/fs.h>
|
|
|
|
#include <linux/pci.h>
|
|
|
|
#include <linux/spinlock.h>
|
2008-08-04 12:54:01 -04:00
|
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <linux/io.h>
|
2007-11-19 09:09:21 -05:00
|
|
|
|
|
|
|
#define NAME "it8712f_wdt"
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Jorge Boncompte - DTI2 <jorge@dti2.net>");
|
|
|
|
MODULE_DESCRIPTION("IT8712F Watchdog Driver");
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
|
|
|
2008-02-10 22:11:15 -05:00
|
|
|
static int max_units = 255;
|
2007-11-19 09:09:21 -05:00
|
|
|
static int margin = 60; /* in seconds */
|
|
|
|
module_param(margin, int, 0);
|
|
|
|
MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
|
|
|
|
|
|
|
|
static int nowayout = WATCHDOG_NOWAYOUT;
|
|
|
|
module_param(nowayout, int, 0);
|
|
|
|
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static unsigned long wdt_open;
|
2007-11-19 09:09:21 -05:00
|
|
|
static unsigned expect_close;
|
|
|
|
static spinlock_t io_lock;
|
2008-02-10 22:11:15 -05:00
|
|
|
static unsigned char revision;
|
2007-11-19 09:09:21 -05:00
|
|
|
|
|
|
|
/* Dog Food address - We use the game port address */
|
|
|
|
static unsigned short address;
|
|
|
|
|
|
|
|
#define REG 0x2e /* The register to read/write */
|
|
|
|
#define VAL 0x2f /* The value to read/write */
|
|
|
|
|
|
|
|
#define LDN 0x07 /* Register: Logical device select */
|
|
|
|
#define DEVID 0x20 /* Register: Device ID */
|
|
|
|
#define DEVREV 0x22 /* Register: Device Revision */
|
|
|
|
#define ACT_REG 0x30 /* LDN Register: Activation */
|
|
|
|
#define BASE_REG 0x60 /* LDN Register: Base address */
|
|
|
|
|
|
|
|
#define IT8712F_DEVID 0x8712
|
|
|
|
|
|
|
|
#define LDN_GPIO 0x07 /* GPIO and Watch Dog Timer */
|
|
|
|
#define LDN_GAME 0x09 /* Game Port */
|
|
|
|
|
|
|
|
#define WDT_CONTROL 0x71 /* WDT Register: Control */
|
|
|
|
#define WDT_CONFIG 0x72 /* WDT Register: Configuration */
|
|
|
|
#define WDT_TIMEOUT 0x73 /* WDT Register: Timeout Value */
|
|
|
|
|
|
|
|
#define WDT_RESET_GAME 0x10
|
|
|
|
#define WDT_RESET_KBD 0x20
|
|
|
|
#define WDT_RESET_MOUSE 0x40
|
|
|
|
#define WDT_RESET_CIR 0x80
|
|
|
|
|
|
|
|
#define WDT_UNIT_SEC 0x80 /* If 0 in MINUTES */
|
|
|
|
|
|
|
|
#define WDT_OUT_PWROK 0x10
|
|
|
|
#define WDT_OUT_KRST 0x40
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static int superio_inb(int reg)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
outb(reg, REG);
|
|
|
|
return inb(VAL);
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static void superio_outb(int val, int reg)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
outb(reg, REG);
|
|
|
|
outb(val, VAL);
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static int superio_inw(int reg)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
int val;
|
|
|
|
outb(reg++, REG);
|
|
|
|
val = inb(VAL) << 8;
|
|
|
|
outb(reg, REG);
|
|
|
|
val |= inb(VAL);
|
|
|
|
return val;
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static inline void superio_select(int ldn)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
outb(LDN, REG);
|
|
|
|
outb(ldn, VAL);
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static inline void superio_enter(void)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
spin_lock(&io_lock);
|
|
|
|
outb(0x87, REG);
|
|
|
|
outb(0x01, REG);
|
|
|
|
outb(0x55, REG);
|
|
|
|
outb(0x55, REG);
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static inline void superio_exit(void)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
outb(0x02, REG);
|
|
|
|
outb(0x02, VAL);
|
|
|
|
spin_unlock(&io_lock);
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static inline void it8712f_wdt_ping(void)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
inb(address);
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static void it8712f_wdt_update_margin(void)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
int config = WDT_OUT_KRST | WDT_OUT_PWROK;
|
2008-02-10 22:11:15 -05:00
|
|
|
int units = margin;
|
|
|
|
|
|
|
|
/* Switch to minutes precision if the configured margin
|
|
|
|
* value does not fit within the register width.
|
|
|
|
*/
|
|
|
|
if (units <= max_units) {
|
|
|
|
config |= WDT_UNIT_SEC; /* else UNIT is MINUTES */
|
|
|
|
printk(KERN_INFO NAME ": timer margin %d seconds\n", units);
|
|
|
|
} else {
|
|
|
|
units /= 60;
|
|
|
|
printk(KERN_INFO NAME ": timer margin %d minutes\n", units);
|
|
|
|
}
|
2007-11-19 09:09:21 -05:00
|
|
|
superio_outb(config, WDT_CONFIG);
|
|
|
|
|
2008-02-10 22:11:15 -05:00
|
|
|
if (revision >= 0x08)
|
2008-04-01 11:06:21 -04:00
|
|
|
superio_outb(units >> 8, WDT_TIMEOUT + 1);
|
|
|
|
superio_outb(units, WDT_TIMEOUT);
|
2008-02-10 22:11:15 -05:00
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static int it8712f_wdt_get_status(void)
|
2008-02-10 22:11:15 -05:00
|
|
|
{
|
|
|
|
if (superio_inb(WDT_CONTROL) & 0x01)
|
|
|
|
return WDIOF_CARDRESET;
|
|
|
|
else
|
|
|
|
return 0;
|
2007-11-19 09:09:21 -05:00
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static void it8712f_wdt_enable(void)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
printk(KERN_DEBUG NAME ": enabling watchdog timer\n");
|
|
|
|
superio_enter();
|
|
|
|
superio_select(LDN_GPIO);
|
|
|
|
|
|
|
|
superio_outb(WDT_RESET_GAME, WDT_CONTROL);
|
|
|
|
|
|
|
|
it8712f_wdt_update_margin();
|
|
|
|
|
|
|
|
superio_exit();
|
|
|
|
|
|
|
|
it8712f_wdt_ping();
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static void it8712f_wdt_disable(void)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
|
|
|
|
|
|
|
|
superio_enter();
|
|
|
|
superio_select(LDN_GPIO);
|
|
|
|
|
|
|
|
superio_outb(0, WDT_CONFIG);
|
|
|
|
superio_outb(0, WDT_CONTROL);
|
2008-04-02 02:43:19 -04:00
|
|
|
if (revision >= 0x08)
|
|
|
|
superio_outb(0, WDT_TIMEOUT + 1);
|
2007-11-19 09:09:21 -05:00
|
|
|
superio_outb(0, WDT_TIMEOUT);
|
|
|
|
|
|
|
|
superio_exit();
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static int it8712f_wdt_notify(struct notifier_block *this,
|
2007-11-19 09:09:21 -05:00
|
|
|
unsigned long code, void *unused)
|
|
|
|
{
|
|
|
|
if (code == SYS_HALT || code == SYS_POWER_OFF)
|
|
|
|
if (!nowayout)
|
|
|
|
it8712f_wdt_disable();
|
|
|
|
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct notifier_block it8712f_wdt_notifier = {
|
|
|
|
.notifier_call = it8712f_wdt_notify,
|
|
|
|
};
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static ssize_t it8712f_wdt_write(struct file *file, const char __user *data,
|
|
|
|
size_t len, loff_t *ppos)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
/* check for a magic close character */
|
|
|
|
if (len) {
|
|
|
|
size_t i;
|
|
|
|
|
|
|
|
it8712f_wdt_ping();
|
|
|
|
|
|
|
|
expect_close = 0;
|
|
|
|
for (i = 0; i < len; ++i) {
|
|
|
|
char c;
|
2008-08-06 16:19:41 -04:00
|
|
|
if (get_user(c, data + i))
|
2007-11-19 09:09:21 -05:00
|
|
|
return -EFAULT;
|
|
|
|
if (c == 'V')
|
|
|
|
expect_close = 42;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return len;
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static long it8712f_wdt_ioctl(struct file *file, unsigned int cmd,
|
|
|
|
unsigned long arg)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
int __user *p = argp;
|
|
|
|
static struct watchdog_info ident = {
|
|
|
|
.identity = "IT8712F Watchdog",
|
|
|
|
.firmware_version = 1,
|
|
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
|
|
|
|
};
|
2008-02-10 22:11:15 -05:00
|
|
|
int value;
|
2007-11-19 09:09:21 -05:00
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
case WDIOC_GETSUPPORT:
|
|
|
|
if (copy_to_user(argp, &ident, sizeof(ident)))
|
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
|
|
case WDIOC_GETSTATUS:
|
2008-02-10 22:11:15 -05:00
|
|
|
superio_enter();
|
|
|
|
superio_select(LDN_GPIO);
|
|
|
|
|
|
|
|
value = it8712f_wdt_get_status();
|
|
|
|
|
|
|
|
superio_exit();
|
|
|
|
|
|
|
|
return put_user(value, p);
|
2007-11-19 09:09:21 -05:00
|
|
|
case WDIOC_GETBOOTSTATUS:
|
|
|
|
return put_user(0, p);
|
|
|
|
case WDIOC_KEEPALIVE:
|
|
|
|
it8712f_wdt_ping();
|
|
|
|
return 0;
|
|
|
|
case WDIOC_SETTIMEOUT:
|
2008-02-10 22:11:15 -05:00
|
|
|
if (get_user(value, p))
|
2007-11-19 09:09:21 -05:00
|
|
|
return -EFAULT;
|
2008-02-10 22:11:15 -05:00
|
|
|
if (value < 1)
|
|
|
|
return -EINVAL;
|
|
|
|
if (value > (max_units * 60))
|
2007-11-19 09:09:21 -05:00
|
|
|
return -EINVAL;
|
2008-02-10 22:11:15 -05:00
|
|
|
margin = value;
|
2007-11-19 09:09:21 -05:00
|
|
|
superio_enter();
|
|
|
|
superio_select(LDN_GPIO);
|
|
|
|
|
|
|
|
it8712f_wdt_update_margin();
|
|
|
|
|
|
|
|
superio_exit();
|
|
|
|
it8712f_wdt_ping();
|
2008-02-10 22:11:15 -05:00
|
|
|
/* Fall through */
|
2007-11-19 09:09:21 -05:00
|
|
|
case WDIOC_GETTIMEOUT:
|
|
|
|
if (put_user(margin, p))
|
|
|
|
return -EFAULT;
|
|
|
|
return 0;
|
2008-07-18 07:41:17 -04:00
|
|
|
default:
|
|
|
|
return -ENOTTY;
|
2007-11-19 09:09:21 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static int it8712f_wdt_open(struct inode *inode, struct file *file)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
/* only allow one at a time */
|
2008-08-04 12:54:01 -04:00
|
|
|
if (test_and_set_bit(0, &wdt_open))
|
2007-11-19 09:09:21 -05:00
|
|
|
return -EBUSY;
|
|
|
|
it8712f_wdt_enable();
|
|
|
|
return nonseekable_open(inode, file);
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static int it8712f_wdt_release(struct inode *inode, struct file *file)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
if (expect_close != 42) {
|
|
|
|
printk(KERN_WARNING NAME
|
|
|
|
": watchdog device closed unexpectedly, will not"
|
|
|
|
" disable the watchdog timer\n");
|
|
|
|
} else if (!nowayout) {
|
|
|
|
it8712f_wdt_disable();
|
|
|
|
}
|
|
|
|
expect_close = 0;
|
2008-08-04 12:54:01 -04:00
|
|
|
clear_bit(0, &wdt_open);
|
2007-11-19 09:09:21 -05:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-01-22 14:48:10 -05:00
|
|
|
static const struct file_operations it8712f_wdt_fops = {
|
2007-11-19 09:09:21 -05:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.llseek = no_llseek,
|
|
|
|
.write = it8712f_wdt_write,
|
2008-08-04 12:54:01 -04:00
|
|
|
.unlocked_ioctl = it8712f_wdt_ioctl,
|
2007-11-19 09:09:21 -05:00
|
|
|
.open = it8712f_wdt_open,
|
|
|
|
.release = it8712f_wdt_release,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct miscdevice it8712f_wdt_miscdev = {
|
|
|
|
.minor = WATCHDOG_MINOR,
|
|
|
|
.name = "watchdog",
|
|
|
|
.fops = &it8712f_wdt_fops,
|
|
|
|
};
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static int __init it8712f_wdt_find(unsigned short *address)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
int err = -ENODEV;
|
|
|
|
int chip_type;
|
|
|
|
|
|
|
|
superio_enter();
|
|
|
|
chip_type = superio_inw(DEVID);
|
|
|
|
if (chip_type != IT8712F_DEVID)
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
superio_select(LDN_GAME);
|
|
|
|
superio_outb(1, ACT_REG);
|
|
|
|
if (!(superio_inb(ACT_REG) & 0x01)) {
|
|
|
|
printk(KERN_ERR NAME ": Device not activated, skipping\n");
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
*address = superio_inw(BASE_REG);
|
|
|
|
if (*address == 0) {
|
|
|
|
printk(KERN_ERR NAME ": Base address not set, skipping\n");
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
err = 0;
|
2008-02-10 22:11:15 -05:00
|
|
|
revision = superio_inb(DEVREV) & 0x0f;
|
|
|
|
|
|
|
|
/* Later revisions have 16-bit values per datasheet 0.9.1 */
|
|
|
|
if (revision >= 0x08)
|
|
|
|
max_units = 65535;
|
|
|
|
|
|
|
|
if (margin > (max_units * 60))
|
|
|
|
margin = (max_units * 60);
|
|
|
|
|
|
|
|
printk(KERN_INFO NAME ": Found IT%04xF chip revision %d - "
|
2007-11-19 09:09:21 -05:00
|
|
|
"using DogFood address 0x%x\n",
|
2008-02-10 22:11:15 -05:00
|
|
|
chip_type, revision, *address);
|
2007-11-19 09:09:21 -05:00
|
|
|
|
|
|
|
exit:
|
|
|
|
superio_exit();
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static int __init it8712f_wdt_init(void)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
int err = 0;
|
|
|
|
|
|
|
|
spin_lock_init(&io_lock);
|
|
|
|
|
|
|
|
if (it8712f_wdt_find(&address))
|
|
|
|
return -ENODEV;
|
|
|
|
|
|
|
|
if (!request_region(address, 1, "IT8712F Watchdog")) {
|
|
|
|
printk(KERN_WARNING NAME ": watchdog I/O region busy\n");
|
|
|
|
return -EBUSY;
|
|
|
|
}
|
|
|
|
|
|
|
|
it8712f_wdt_disable();
|
|
|
|
|
|
|
|
err = register_reboot_notifier(&it8712f_wdt_notifier);
|
|
|
|
if (err) {
|
|
|
|
printk(KERN_ERR NAME ": unable to register reboot notifier\n");
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
err = misc_register(&it8712f_wdt_miscdev);
|
|
|
|
if (err) {
|
|
|
|
printk(KERN_ERR NAME
|
|
|
|
": cannot register miscdev on minor=%d (err=%d)\n",
|
|
|
|
WATCHDOG_MINOR, err);
|
|
|
|
goto reboot_out;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
|
|
reboot_out:
|
|
|
|
unregister_reboot_notifier(&it8712f_wdt_notifier);
|
|
|
|
out:
|
|
|
|
release_region(address, 1);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2008-08-04 12:54:01 -04:00
|
|
|
static void __exit it8712f_wdt_exit(void)
|
2007-11-19 09:09:21 -05:00
|
|
|
{
|
|
|
|
misc_deregister(&it8712f_wdt_miscdev);
|
|
|
|
unregister_reboot_notifier(&it8712f_wdt_notifier);
|
|
|
|
release_region(address, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(it8712f_wdt_init);
|
|
|
|
module_exit(it8712f_wdt_exit);
|