[mirror_ubuntu-hirsute-kernel.git] / drivers / watchdog / it8712f_wdt.c

/*
 *	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
 *	IT8712F EC-LPC I/O Preliminary Specification 0.8.2
 *	IT8712F EC-LPC I/O Preliminary Specification 0.9.3
 *
 *	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/spinlock.h>
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/ioport.h>

#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);

static int max_units = 255;
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");

static unsigned long wdt_open;
static unsigned expect_close;
static unsigned char revision;

/* 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	/* Reset timer on read or write to game port */
#define WDT_RESET_KBD	0x20	/* Reset timer on keyboard interrupt */
#define WDT_RESET_MOUSE	0x40	/* Reset timer on mouse interrupt */
#define WDT_RESET_CIR	0x80	/* Reset timer on consumer IR interrupt */

#define WDT_UNIT_SEC	0x80	/* If 0 in MINUTES */

#define WDT_OUT_PWROK	0x10	/* Pulse PWROK on timeout */
#define WDT_OUT_KRST	0x40	/* Pulse reset on timeout */

static int wdt_control_reg = WDT_RESET_GAME;
module_param(wdt_control_reg, int, 0);
MODULE_PARM_DESC(wdt_control_reg, "Value to write to watchdog control "
		"register. The default WDT_RESET_GAME resets the timer on "
		"game port reads that this driver generates. You can also "
		"use KBD, MOUSE or CIR if you have some external way to "
		"generate those interrupts.");

static int superio_inb(int reg)
{
	outb(reg, REG);
	return inb(VAL);
}

static void superio_outb(int val, int reg)
{
	outb(reg, REG);
	outb(val, VAL);
}

static int superio_inw(int reg)
{
	int val;
	outb(reg++, REG);
	val = inb(VAL) << 8;
	outb(reg, REG);
	val |= inb(VAL);
	return val;
}

static inline void superio_select(int ldn)
{
	outb(LDN, REG);
	outb(ldn, VAL);
}

static inline int superio_enter(void)
{
	/*
	 * Try to reserve REG and REG + 1 for exclusive access.
	 */
	if (!request_muxed_region(REG, 2, NAME))
		return -EBUSY;

	outb(0x87, REG);
	outb(0x01, REG);
	outb(0x55, REG);
	outb(0x55, REG);
	return 0;
}

static inline void superio_exit(void)
{
	outb(0x02, REG);
	outb(0x02, VAL);
	release_region(REG, 2);
}

static inline void it8712f_wdt_ping(void)
{
	if (wdt_control_reg & WDT_RESET_GAME)
		inb(address);
}

static void it8712f_wdt_update_margin(void)
{
	int config = WDT_OUT_KRST | WDT_OUT_PWROK;
	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);
	}
	superio_outb(config, WDT_CONFIG);

	if (revision >= 0x08)
		superio_outb(units >> 8, WDT_TIMEOUT + 1);
	superio_outb(units, WDT_TIMEOUT);
}

static int it8712f_wdt_get_status(void)
{
	if (superio_inb(WDT_CONTROL) & 0x01)
		return WDIOF_CARDRESET;
	else
		return 0;
}

static int it8712f_wdt_enable(void)
{
	int ret = superio_enter();
	if (ret)
		return ret;

	printk(KERN_DEBUG NAME ": enabling watchdog timer\n");
	superio_select(LDN_GPIO);

	superio_outb(wdt_control_reg, WDT_CONTROL);

	it8712f_wdt_update_margin();

	superio_exit();

	it8712f_wdt_ping();

	return 0;
}

static int it8712f_wdt_disable(void)
{
	int ret = superio_enter();
	if (ret)
		return ret;

	printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
	superio_select(LDN_GPIO);

	superio_outb(0, WDT_CONFIG);
	superio_outb(0, WDT_CONTROL);
	if (revision >= 0x08)
		superio_outb(0, WDT_TIMEOUT + 1);
	superio_outb(0, WDT_TIMEOUT);

	superio_exit();
	return 0;
}

static int it8712f_wdt_notify(struct notifier_block *this,
		    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,
};

static ssize_t it8712f_wdt_write(struct file *file, const char __user *data,
					size_t len, loff_t *ppos)
{
	/* 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;
			if (get_user(c, data + i))
				return -EFAULT;
			if (c == 'V')
				expect_close = 42;
		}
	}

	return len;
}

static long it8712f_wdt_ioctl(struct file *file, unsigned int cmd,
							unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	int __user *p = argp;
	static const struct watchdog_info ident = {
		.identity = "IT8712F Watchdog",
		.firmware_version = 1,
		.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
						WDIOF_MAGICCLOSE,
	};
	int value;
	int ret;

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user(argp, &ident, sizeof(ident)))
			return -EFAULT;
		return 0;
	case WDIOC_GETSTATUS:
		ret = superio_enter();
		if (ret)
			return ret;
		superio_select(LDN_GPIO);

		value = it8712f_wdt_get_status();

		superio_exit();

		return put_user(value, p);
	case WDIOC_GETBOOTSTATUS:
		return put_user(0, p);
	case WDIOC_KEEPALIVE:
		it8712f_wdt_ping();
		return 0;
	case WDIOC_SETTIMEOUT:
		if (get_user(value, p))
			return -EFAULT;
		if (value < 1)
			return -EINVAL;
		if (value > (max_units * 60))
			return -EINVAL;
		margin = value;
		ret = superio_enter();
		if (ret)
			return ret;
		superio_select(LDN_GPIO);

		it8712f_wdt_update_margin();

		superio_exit();
		it8712f_wdt_ping();
		/* Fall through */
	case WDIOC_GETTIMEOUT:
		if (put_user(margin, p))
			return -EFAULT;
		return 0;
	default:
		return -ENOTTY;
	}
}

static int it8712f_wdt_open(struct inode *inode, struct file *file)
{
	int ret;
	/* only allow one at a time */
	if (test_and_set_bit(0, &wdt_open))
		return -EBUSY;

	ret = it8712f_wdt_enable();
	if (ret)
		return ret;
	return nonseekable_open(inode, file);
}

static int it8712f_wdt_release(struct inode *inode, struct file *file)
{
	if (expect_close != 42) {
		printk(KERN_WARNING NAME
			": watchdog device closed unexpectedly, will not"
			" disable the watchdog timer\n");
	} else if (!nowayout) {
		if (it8712f_wdt_disable())
			printk(KERN_WARNING NAME "Watchdog disable failed\n");
	}
	expect_close = 0;
	clear_bit(0, &wdt_open);

	return 0;
}

static const struct file_operations it8712f_wdt_fops = {
	.owner = THIS_MODULE,
	.llseek = no_llseek,
	.write = it8712f_wdt_write,
	.unlocked_ioctl = it8712f_wdt_ioctl,
	.open = it8712f_wdt_open,
	.release = it8712f_wdt_release,
};

static struct miscdevice it8712f_wdt_miscdev = {
	.minor = WATCHDOG_MINOR,
	.name = "watchdog",
	.fops = &it8712f_wdt_fops,
};

static int __init it8712f_wdt_find(unsigned short *address)
{
	int err = -ENODEV;
	int chip_type;
	int ret = superio_enter();
	if (ret)
		return ret;

	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;
	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 - "
		"using DogFood address 0x%x\n",
		chip_type, revision, *address);

exit:
	superio_exit();
	return err;
}

static int __init it8712f_wdt_init(void)
{
	int err = 0;

	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;
	}

	err = it8712f_wdt_disable();
	if (err) {
		printk(KERN_ERR NAME ": unable to disable watchdog timer.\n");
		goto out;
	}

	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;
}

static void __exit it8712f_wdt_exit(void)
{
	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);
Commit	Line	Data
38ff6fd2 JBD	1	/*
	2	* IT8712F "Smart Guardian" Watchdog support
	3	*
	4	* Copyright (c) 2006-2007 Jorge Boncompte - DTI2 <jorge@dti2.net>
	5	*
	6	* Based on info and code taken from:
	7	*
	8	* drivers/char/watchdog/scx200_wdt.c
	9	* drivers/hwmon/it87.c
5e699608 AP	10	* IT8712F EC-LPC I/O Preliminary Specification 0.8.2
5e699608 AP	11	* IT8712F EC-LPC I/O Preliminary Specification 0.9.3
38ff6fd2 JBD	12	*
	13	* This program is free software; you can redistribute it and/or
	14	* modify it under the terms of the GNU General Public License as
	15	* published by the Free Software Foundation; either version 2 of the
	16	* License, or (at your option) any later version.
	17	*
	18	* The author(s) of this software shall not be held liable for damages
	19	* of any nature resulting due to the use of this software. This
	20	* software is provided AS-IS with no warranties.
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/moduleparam.h>
	25	#include <linux/init.h>
	26	#include <linux/miscdevice.h>
	27	#include <linux/watchdog.h>
	28	#include <linux/notifier.h>
	29	#include <linux/reboot.h>
	30	#include <linux/fs.h>
38ff6fd2	31	#include <linux/spinlock.h>
d6547378 AC	32	#include <linux/uaccess.h>
d6547378 AC	33	#include <linux/io.h>
22602868	34	#include <linux/ioport.h>
38ff6fd2 JBD	35
	36	#define NAME "it8712f_wdt"
	37
	38	MODULE_AUTHOR("Jorge Boncompte - DTI2 <jorge@dti2.net>");
	39	MODULE_DESCRIPTION("IT8712F Watchdog Driver");
	40	MODULE_LICENSE("GPL");
	41	MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
	42
5e699608	43	static int max_units = 255;
38ff6fd2 JBD	44	static int margin = 60; /* in seconds */
	45	module_param(margin, int, 0);
	46	MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
	47
	48	static int nowayout = WATCHDOG_NOWAYOUT;
	49	module_param(nowayout, int, 0);
	50	MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
	51
d6547378	52	static unsigned long wdt_open;
38ff6fd2	53	static unsigned expect_close;
5e699608	54	static unsigned char revision;
38ff6fd2 JBD	55
	56	/* Dog Food address - We use the game port address */
	57	static unsigned short address;
	58
	59	#define REG 0x2e /* The register to read/write */
	60	#define VAL 0x2f /* The value to read/write */
	61
	62	#define LDN 0x07 /* Register: Logical device select */
	63	#define DEVID 0x20 /* Register: Device ID */
	64	#define DEVREV 0x22 /* Register: Device Revision */
	65	#define ACT_REG 0x30 /* LDN Register: Activation */
	66	#define BASE_REG 0x60 /* LDN Register: Base address */
	67
	68	#define IT8712F_DEVID 0x8712
	69
	70	#define LDN_GPIO 0x07 /* GPIO and Watch Dog Timer */
5f3b2756	71	#define LDN_GAME 0x09 /* Game Port */
38ff6fd2 JBD	72
	73	#define WDT_CONTROL 0x71 /* WDT Register: Control */
	74	#define WDT_CONFIG 0x72 /* WDT Register: Configuration */
	75	#define WDT_TIMEOUT 0x73 /* WDT Register: Timeout Value */
	76
f0fc1074 TJL	77	#define WDT_RESET_GAME 0x10 /* Reset timer on read or write to game port */
	78	#define WDT_RESET_KBD 0x20 /* Reset timer on keyboard interrupt */
	79	#define WDT_RESET_MOUSE 0x40 /* Reset timer on mouse interrupt */
	80	#define WDT_RESET_CIR 0x80 /* Reset timer on consumer IR interrupt */
38ff6fd2 JBD	81
	82	#define WDT_UNIT_SEC 0x80 /* If 0 in MINUTES */
	83
f0fc1074 TJL	84	#define WDT_OUT_PWROK 0x10 /* Pulse PWROK on timeout */
f0fc1074 TJL	85	#define WDT_OUT_KRST 0x40 /* Pulse reset on timeout */
38ff6fd2	86
a422088d TJL	87	static int wdt_control_reg = WDT_RESET_GAME;
	88	module_param(wdt_control_reg, int, 0);
	89	MODULE_PARM_DESC(wdt_control_reg, "Value to write to watchdog control "
	90	"register. The default WDT_RESET_GAME resets the timer on "
	91	"game port reads that this driver generates. You can also "
	92	"use KBD, MOUSE or CIR if you have some external way to "
	93	"generate those interrupts.");
	94
d6547378	95	static int superio_inb(int reg)
38ff6fd2 JBD	96	{
	97	outb(reg, REG);
	98	return inb(VAL);
	99	}
	100
d6547378	101	static void superio_outb(int val, int reg)
38ff6fd2 JBD	102	{
	103	outb(reg, REG);
	104	outb(val, VAL);
	105	}
	106
d6547378	107	static int superio_inw(int reg)
38ff6fd2 JBD	108	{
	109	int val;
	110	outb(reg++, REG);
	111	val = inb(VAL) << 8;
	112	outb(reg, REG);
	113	val \|= inb(VAL);
	114	return val;
	115	}
	116
d6547378	117	static inline void superio_select(int ldn)
38ff6fd2 JBD	118	{
	119	outb(LDN, REG);
	120	outb(ldn, VAL);
	121	}
	122
a134b825	123	static inline int superio_enter(void)
38ff6fd2	124	{
a134b825 NG	125	/*
	126	* Try to reserve REG and REG + 1 for exclusive access.
	127	*/
	128	if (!request_muxed_region(REG, 2, NAME))
	129	return -EBUSY;
	130
38ff6fd2 JBD	131	outb(0x87, REG);
	132	outb(0x01, REG);
	133	outb(0x55, REG);
	134	outb(0x55, REG);
a134b825	135	return 0;
38ff6fd2 JBD	136	}
38ff6fd2 JBD	137
d6547378	138	static inline void superio_exit(void)
38ff6fd2 JBD	139	{
	140	outb(0x02, REG);
	141	outb(0x02, VAL);
a134b825	142	release_region(REG, 2);
38ff6fd2 JBD	143	}
38ff6fd2 JBD	144
d6547378	145	static inline void it8712f_wdt_ping(void)
38ff6fd2	146	{
a422088d TJL	147	if (wdt_control_reg & WDT_RESET_GAME)
a422088d TJL	148	inb(address);
38ff6fd2 JBD	149	}
38ff6fd2 JBD	150
d6547378	151	static void it8712f_wdt_update_margin(void)
38ff6fd2 JBD	152	{
38ff6fd2 JBD	153	int config = WDT_OUT_KRST \| WDT_OUT_PWROK;
5e699608 AP	154	int units = margin;
	155
	156	/* Switch to minutes precision if the configured margin
	157	* value does not fit within the register width.
	158	*/
	159	if (units <= max_units) {
	160	config \|= WDT_UNIT_SEC; /* else UNIT is MINUTES */
	161	printk(KERN_INFO NAME ": timer margin %d seconds\n", units);
	162	} else {
	163	units /= 60;
	164	printk(KERN_INFO NAME ": timer margin %d minutes\n", units);
	165	}
38ff6fd2 JBD	166	superio_outb(config, WDT_CONFIG);
38ff6fd2 JBD	167
5e699608	168	if (revision >= 0x08)
0e45adb8 OS	169	superio_outb(units >> 8, WDT_TIMEOUT + 1);
0e45adb8 OS	170	superio_outb(units, WDT_TIMEOUT);
5e699608 AP	171	}
5e699608 AP	172
d6547378	173	static int it8712f_wdt_get_status(void)
5e699608 AP	174	{
	175	if (superio_inb(WDT_CONTROL) & 0x01)
	176	return WDIOF_CARDRESET;
	177	else
	178	return 0;
38ff6fd2 JBD	179	}
38ff6fd2 JBD	180
a134b825	181	static int it8712f_wdt_enable(void)
38ff6fd2	182	{
a134b825 NG	183	int ret = superio_enter();
	184	if (ret)
	185	return ret;
	186
38ff6fd2	187	printk(KERN_DEBUG NAME ": enabling watchdog timer\n");
38ff6fd2 JBD	188	superio_select(LDN_GPIO);
38ff6fd2 JBD	189
a422088d	190	superio_outb(wdt_control_reg, WDT_CONTROL);
38ff6fd2 JBD	191
	192	it8712f_wdt_update_margin();
	193
	194	superio_exit();
	195
	196	it8712f_wdt_ping();
a134b825 NG	197
a134b825 NG	198	return 0;
38ff6fd2 JBD	199	}
38ff6fd2 JBD	200
a134b825	201	static int it8712f_wdt_disable(void)
38ff6fd2	202	{
a134b825 NG	203	int ret = superio_enter();
	204	if (ret)
	205	return ret;
38ff6fd2	206
a134b825	207	printk(KERN_DEBUG NAME ": disabling watchdog timer\n");
38ff6fd2 JBD	208	superio_select(LDN_GPIO);
	209
	210	superio_outb(0, WDT_CONFIG);
	211	superio_outb(0, WDT_CONTROL);
cc1020f1 AP	212	if (revision >= 0x08)
cc1020f1 AP	213	superio_outb(0, WDT_TIMEOUT + 1);
38ff6fd2 JBD	214	superio_outb(0, WDT_TIMEOUT);
	215
	216	superio_exit();
a134b825	217	return 0;
38ff6fd2 JBD	218	}
38ff6fd2 JBD	219
d6547378	220	static int it8712f_wdt_notify(struct notifier_block *this,
38ff6fd2 JBD	221	unsigned long code, void *unused)
	222	{
	223	if (code == SYS_HALT \|\| code == SYS_POWER_OFF)
	224	if (!nowayout)
	225	it8712f_wdt_disable();
	226
	227	return NOTIFY_DONE;
	228	}
	229
	230	static struct notifier_block it8712f_wdt_notifier = {
	231	.notifier_call = it8712f_wdt_notify,
	232	};
	233
d6547378 AC	234	static ssize_t it8712f_wdt_write(struct file file, const char __user data,
d6547378 AC	235	size_t len, loff_t *ppos)
38ff6fd2 JBD	236	{
	237	/* check for a magic close character */
	238	if (len) {
	239	size_t i;
	240
	241	it8712f_wdt_ping();
	242
	243	expect_close = 0;
	244	for (i = 0; i < len; ++i) {
	245	char c;
7944d3a5	246	if (get_user(c, data + i))
38ff6fd2 JBD	247	return -EFAULT;
	248	if (c == 'V')
	249	expect_close = 42;
	250	}
	251	}
	252
	253	return len;
	254	}
	255
d6547378 AC	256	static long it8712f_wdt_ioctl(struct file *file, unsigned int cmd,
d6547378 AC	257	unsigned long arg)
38ff6fd2 JBD	258	{
	259	void __user argp = (void __user )arg;
	260	int __user *p = argp;
42747d71	261	static const struct watchdog_info ident = {
38ff6fd2 JBD	262	.identity = "IT8712F Watchdog",
38ff6fd2 JBD	263	.firmware_version = 1,
e73a7802 WVS	264	.options = WDIOF_SETTIMEOUT \| WDIOF_KEEPALIVEPING \|
e73a7802 WVS	265	WDIOF_MAGICCLOSE,
38ff6fd2	266	};
5e699608	267	int value;
a134b825	268	int ret;
38ff6fd2 JBD	269
38ff6fd2 JBD	270	switch (cmd) {
38ff6fd2 JBD	271	case WDIOC_GETSUPPORT:
	272	if (copy_to_user(argp, &ident, sizeof(ident)))
	273	return -EFAULT;
	274	return 0;
	275	case WDIOC_GETSTATUS:
a134b825 NG	276	ret = superio_enter();
	277	if (ret)
	278	return ret;
5e699608 AP	279	superio_select(LDN_GPIO);
	280
	281	value = it8712f_wdt_get_status();
	282
	283	superio_exit();
	284
	285	return put_user(value, p);
38ff6fd2 JBD	286	case WDIOC_GETBOOTSTATUS:
	287	return put_user(0, p);
	288	case WDIOC_KEEPALIVE:
	289	it8712f_wdt_ping();
	290	return 0;
	291	case WDIOC_SETTIMEOUT:
5e699608	292	if (get_user(value, p))
38ff6fd2	293	return -EFAULT;
5e699608 AP	294	if (value < 1)
	295	return -EINVAL;
	296	if (value > (max_units * 60))
38ff6fd2	297	return -EINVAL;
5e699608	298	margin = value;
a134b825 NG	299	ret = superio_enter();
	300	if (ret)
	301	return ret;
38ff6fd2 JBD	302	superio_select(LDN_GPIO);
	303
	304	it8712f_wdt_update_margin();
	305
	306	superio_exit();
	307	it8712f_wdt_ping();
5e699608	308	/* Fall through */
38ff6fd2 JBD	309	case WDIOC_GETTIMEOUT:
	310	if (put_user(margin, p))
	311	return -EFAULT;
	312	return 0;
0c06090c WVS	313	default:
0c06090c WVS	314	return -ENOTTY;
38ff6fd2 JBD	315	}
	316	}
	317
d6547378	318	static int it8712f_wdt_open(struct inode inode, struct file file)
38ff6fd2	319	{
a134b825	320	int ret;
38ff6fd2	321	/* only allow one at a time */
d6547378	322	if (test_and_set_bit(0, &wdt_open))
38ff6fd2	323	return -EBUSY;
a134b825 NG	324
	325	ret = it8712f_wdt_enable();
	326	if (ret)
	327	return ret;
38ff6fd2 JBD	328	return nonseekable_open(inode, file);
	329	}
	330
d6547378	331	static int it8712f_wdt_release(struct inode inode, struct file file)
38ff6fd2 JBD	332	{
	333	if (expect_close != 42) {
	334	printk(KERN_WARNING NAME
	335	": watchdog device closed unexpectedly, will not"
	336	" disable the watchdog timer\n");
	337	} else if (!nowayout) {
a134b825 NG	338	if (it8712f_wdt_disable())
a134b825 NG	339	printk(KERN_WARNING NAME "Watchdog disable failed\n");
38ff6fd2 JBD	340	}
38ff6fd2 JBD	341	expect_close = 0;
d6547378	342	clear_bit(0, &wdt_open);
38ff6fd2 JBD	343
	344	return 0;
	345	}
	346
b47a166e	347	static const struct file_operations it8712f_wdt_fops = {
38ff6fd2 JBD	348	.owner = THIS_MODULE,
	349	.llseek = no_llseek,
	350	.write = it8712f_wdt_write,
d6547378	351	.unlocked_ioctl = it8712f_wdt_ioctl,
38ff6fd2 JBD	352	.open = it8712f_wdt_open,
	353	.release = it8712f_wdt_release,
	354	};
	355
	356	static struct miscdevice it8712f_wdt_miscdev = {
	357	.minor = WATCHDOG_MINOR,
	358	.name = "watchdog",
	359	.fops = &it8712f_wdt_fops,
	360	};
	361
d6547378	362	static int __init it8712f_wdt_find(unsigned short *address)
38ff6fd2 JBD	363	{
	364	int err = -ENODEV;
	365	int chip_type;
a134b825 NG	366	int ret = superio_enter();
	367	if (ret)
	368	return ret;
38ff6fd2	369
38ff6fd2 JBD	370	chip_type = superio_inw(DEVID);
	371	if (chip_type != IT8712F_DEVID)
	372	goto exit;
	373
	374	superio_select(LDN_GAME);
	375	superio_outb(1, ACT_REG);
	376	if (!(superio_inb(ACT_REG) & 0x01)) {
	377	printk(KERN_ERR NAME ": Device not activated, skipping\n");
	378	goto exit;
	379	}
	380
	381	*address = superio_inw(BASE_REG);
	382	if (*address == 0) {
	383	printk(KERN_ERR NAME ": Base address not set, skipping\n");
	384	goto exit;
	385	}
	386
	387	err = 0;
5e699608 AP	388	revision = superio_inb(DEVREV) & 0x0f;
	389
	390	/* Later revisions have 16-bit values per datasheet 0.9.1 */
	391	if (revision >= 0x08)
	392	max_units = 65535;
	393
	394	if (margin > (max_units * 60))
	395	margin = (max_units * 60);
	396
	397	printk(KERN_INFO NAME ": Found IT%04xF chip revision %d - "
38ff6fd2	398	"using DogFood address 0x%x\n",
5e699608	399	chip_type, revision, *address);
38ff6fd2 JBD	400
	401	exit:
	402	superio_exit();
	403	return err;
	404	}
	405
d6547378	406	static int __init it8712f_wdt_init(void)
38ff6fd2 JBD	407	{
	408	int err = 0;
	409
38ff6fd2 JBD	410	if (it8712f_wdt_find(&address))
	411	return -ENODEV;
	412
	413	if (!request_region(address, 1, "IT8712F Watchdog")) {
	414	printk(KERN_WARNING NAME ": watchdog I/O region busy\n");
	415	return -EBUSY;
	416	}
	417
a134b825 NG	418	err = it8712f_wdt_disable();
	419	if (err) {
	420	printk(KERN_ERR NAME ": unable to disable watchdog timer.\n");
	421	goto out;
	422	}
38ff6fd2	423
38ff6fd2 JBD	424	err = register_reboot_notifier(&it8712f_wdt_notifier);
	425	if (err) {
	426	printk(KERN_ERR NAME ": unable to register reboot notifier\n");
	427	goto out;
	428	}
	429
	430	err = misc_register(&it8712f_wdt_miscdev);
	431	if (err) {
	432	printk(KERN_ERR NAME
	433	": cannot register miscdev on minor=%d (err=%d)\n",
	434	WATCHDOG_MINOR, err);
	435	goto reboot_out;
	436	}
	437
	438	return 0;
	439
	440
	441	reboot_out:
	442	unregister_reboot_notifier(&it8712f_wdt_notifier);
	443	out:
	444	release_region(address, 1);
	445	return err;
	446	}
	447
d6547378	448	static void __exit it8712f_wdt_exit(void)
38ff6fd2 JBD	449	{
	450	misc_deregister(&it8712f_wdt_miscdev);
	451	unregister_reboot_notifier(&it8712f_wdt_notifier);
	452	release_region(address, 1);
	453	}
	454
	455	module_init(it8712f_wdt_init);
	456	module_exit(it8712f_wdt_exit);