blob: f4cce6d66a5573b42afb4517a26752fe15b2a5be [file] [log] [blame]
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +01001/*
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
Andrew Paprocki5e699602008-02-10 22:11:15 -050010 * IT8712F EC-LPC I/O Preliminary Specification 0.8.2
11 * IT8712F EC-LPC I/O Preliminary Specification 0.9.3
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010012 *
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
Joe Perches27c766a2012-02-15 15:06:19 -080023#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010025#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/init.h>
28#include <linux/miscdevice.h>
29#include <linux/watchdog.h>
30#include <linux/notifier.h>
31#include <linux/reboot.h>
32#include <linux/fs.h>
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010033#include <linux/spinlock.h>
Alan Coxd6547372008-08-04 17:54:01 +010034#include <linux/uaccess.h>
35#include <linux/io.h>
Wim Van Sebroeck22602862011-07-25 18:53:00 +000036#include <linux/ioport.h>
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010037
Joe Perches27c766a2012-02-15 15:06:19 -080038#define DEBUG
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010039#define NAME "it8712f_wdt"
40
41MODULE_AUTHOR("Jorge Boncompte - DTI2 <jorge@dti2.net>");
42MODULE_DESCRIPTION("IT8712F Watchdog Driver");
43MODULE_LICENSE("GPL");
44MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
45
Andrew Paprocki5e699602008-02-10 22:11:15 -050046static int max_units = 255;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010047static int margin = 60; /* in seconds */
48module_param(margin, int, 0);
49MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
50
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +010051static bool nowayout = WATCHDOG_NOWAYOUT;
52module_param(nowayout, bool, 0);
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010053MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
54
Alan Coxd6547372008-08-04 17:54:01 +010055static unsigned long wdt_open;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010056static unsigned expect_close;
Andrew Paprocki5e699602008-02-10 22:11:15 -050057static unsigned char revision;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010058
59/* Dog Food address - We use the game port address */
60static unsigned short address;
61
62#define REG 0x2e /* The register to read/write */
63#define VAL 0x2f /* The value to read/write */
64
65#define LDN 0x07 /* Register: Logical device select */
66#define DEVID 0x20 /* Register: Device ID */
67#define DEVREV 0x22 /* Register: Device Revision */
68#define ACT_REG 0x30 /* LDN Register: Activation */
69#define BASE_REG 0x60 /* LDN Register: Base address */
70
71#define IT8712F_DEVID 0x8712
72
73#define LDN_GPIO 0x07 /* GPIO and Watch Dog Timer */
Wim Van Sebroeck5f3b2752011-02-23 20:04:38 +000074#define LDN_GAME 0x09 /* Game Port */
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010075
76#define WDT_CONTROL 0x71 /* WDT Register: Control */
77#define WDT_CONFIG 0x72 /* WDT Register: Configuration */
78#define WDT_TIMEOUT 0x73 /* WDT Register: Timeout Value */
79
Timo Juhani Lindforsf0fc1072010-09-30 17:08:03 +030080#define WDT_RESET_GAME 0x10 /* Reset timer on read or write to game port */
81#define WDT_RESET_KBD 0x20 /* Reset timer on keyboard interrupt */
82#define WDT_RESET_MOUSE 0x40 /* Reset timer on mouse interrupt */
83#define WDT_RESET_CIR 0x80 /* Reset timer on consumer IR interrupt */
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010084
85#define WDT_UNIT_SEC 0x80 /* If 0 in MINUTES */
86
Timo Juhani Lindforsf0fc1072010-09-30 17:08:03 +030087#define WDT_OUT_PWROK 0x10 /* Pulse PWROK on timeout */
88#define WDT_OUT_KRST 0x40 /* Pulse reset on timeout */
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010089
Timo Juhani Lindforsa4220882010-09-30 17:08:04 +030090static int wdt_control_reg = WDT_RESET_GAME;
91module_param(wdt_control_reg, int, 0);
92MODULE_PARM_DESC(wdt_control_reg, "Value to write to watchdog control "
93 "register. The default WDT_RESET_GAME resets the timer on "
94 "game port reads that this driver generates. You can also "
95 "use KBD, MOUSE or CIR if you have some external way to "
96 "generate those interrupts.");
97
Alan Coxd6547372008-08-04 17:54:01 +010098static int superio_inb(int reg)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +010099{
100 outb(reg, REG);
101 return inb(VAL);
102}
103
Alan Coxd6547372008-08-04 17:54:01 +0100104static void superio_outb(int val, int reg)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100105{
106 outb(reg, REG);
107 outb(val, VAL);
108}
109
Alan Coxd6547372008-08-04 17:54:01 +0100110static int superio_inw(int reg)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100111{
112 int val;
113 outb(reg++, REG);
114 val = inb(VAL) << 8;
115 outb(reg, REG);
116 val |= inb(VAL);
117 return val;
118}
119
Alan Coxd6547372008-08-04 17:54:01 +0100120static inline void superio_select(int ldn)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100121{
122 outb(LDN, REG);
123 outb(ldn, VAL);
124}
125
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700126static inline int superio_enter(void)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100127{
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700128 /*
129 * Try to reserve REG and REG + 1 for exclusive access.
130 */
131 if (!request_muxed_region(REG, 2, NAME))
132 return -EBUSY;
133
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100134 outb(0x87, REG);
135 outb(0x01, REG);
136 outb(0x55, REG);
137 outb(0x55, REG);
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700138 return 0;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100139}
140
Alan Coxd6547372008-08-04 17:54:01 +0100141static inline void superio_exit(void)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100142{
143 outb(0x02, REG);
144 outb(0x02, VAL);
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700145 release_region(REG, 2);
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100146}
147
Alan Coxd6547372008-08-04 17:54:01 +0100148static inline void it8712f_wdt_ping(void)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100149{
Timo Juhani Lindforsa4220882010-09-30 17:08:04 +0300150 if (wdt_control_reg & WDT_RESET_GAME)
151 inb(address);
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100152}
153
Alan Coxd6547372008-08-04 17:54:01 +0100154static void it8712f_wdt_update_margin(void)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100155{
156 int config = WDT_OUT_KRST | WDT_OUT_PWROK;
Andrew Paprocki5e699602008-02-10 22:11:15 -0500157 int units = margin;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100158
Andrew Paprocki5e699602008-02-10 22:11:15 -0500159 /* Switch to minutes precision if the configured margin
160 * value does not fit within the register width.
161 */
162 if (units <= max_units) {
163 config |= WDT_UNIT_SEC; /* else UNIT is MINUTES */
Joe Perches27c766a2012-02-15 15:06:19 -0800164 pr_info("timer margin %d seconds\n", units);
Andrew Paprocki5e699602008-02-10 22:11:15 -0500165 } else {
166 units /= 60;
Joe Perches27c766a2012-02-15 15:06:19 -0800167 pr_info("timer margin %d minutes\n", units);
Andrew Paprocki5e699602008-02-10 22:11:15 -0500168 }
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100169 superio_outb(config, WDT_CONFIG);
170
Andrew Paprocki5e699602008-02-10 22:11:15 -0500171 if (revision >= 0x08)
Oliver Schuster0e45adb2008-04-01 17:06:21 +0200172 superio_outb(units >> 8, WDT_TIMEOUT + 1);
173 superio_outb(units, WDT_TIMEOUT);
Andrew Paprocki5e699602008-02-10 22:11:15 -0500174}
175
Alan Coxd6547372008-08-04 17:54:01 +0100176static int it8712f_wdt_get_status(void)
Andrew Paprocki5e699602008-02-10 22:11:15 -0500177{
178 if (superio_inb(WDT_CONTROL) & 0x01)
179 return WDIOF_CARDRESET;
180 else
181 return 0;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100182}
183
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700184static int it8712f_wdt_enable(void)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100185{
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700186 int ret = superio_enter();
187 if (ret)
188 return ret;
189
Joe Perches27c766a2012-02-15 15:06:19 -0800190 pr_debug("enabling watchdog timer\n");
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100191 superio_select(LDN_GPIO);
192
Timo Juhani Lindforsa4220882010-09-30 17:08:04 +0300193 superio_outb(wdt_control_reg, WDT_CONTROL);
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100194
195 it8712f_wdt_update_margin();
196
197 superio_exit();
198
199 it8712f_wdt_ping();
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700200
201 return 0;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100202}
203
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700204static int it8712f_wdt_disable(void)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100205{
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700206 int ret = superio_enter();
207 if (ret)
208 return ret;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100209
Joe Perches27c766a2012-02-15 15:06:19 -0800210 pr_debug("disabling watchdog timer\n");
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100211 superio_select(LDN_GPIO);
212
213 superio_outb(0, WDT_CONFIG);
214 superio_outb(0, WDT_CONTROL);
Andrew Paprockicc1020f2008-04-02 02:43:19 -0400215 if (revision >= 0x08)
216 superio_outb(0, WDT_TIMEOUT + 1);
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100217 superio_outb(0, WDT_TIMEOUT);
218
219 superio_exit();
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700220 return 0;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100221}
222
Alan Coxd6547372008-08-04 17:54:01 +0100223static int it8712f_wdt_notify(struct notifier_block *this,
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100224 unsigned long code, void *unused)
225{
226 if (code == SYS_HALT || code == SYS_POWER_OFF)
227 if (!nowayout)
228 it8712f_wdt_disable();
229
230 return NOTIFY_DONE;
231}
232
233static struct notifier_block it8712f_wdt_notifier = {
234 .notifier_call = it8712f_wdt_notify,
235};
236
Alan Coxd6547372008-08-04 17:54:01 +0100237static ssize_t it8712f_wdt_write(struct file *file, const char __user *data,
238 size_t len, loff_t *ppos)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100239{
240 /* check for a magic close character */
241 if (len) {
242 size_t i;
243
244 it8712f_wdt_ping();
245
246 expect_close = 0;
247 for (i = 0; i < len; ++i) {
248 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000249 if (get_user(c, data + i))
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100250 return -EFAULT;
251 if (c == 'V')
252 expect_close = 42;
253 }
254 }
255
256 return len;
257}
258
Alan Coxd6547372008-08-04 17:54:01 +0100259static long it8712f_wdt_ioctl(struct file *file, unsigned int cmd,
260 unsigned long arg)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100261{
262 void __user *argp = (void __user *)arg;
263 int __user *p = argp;
Wim Van Sebroeck42747d72009-12-26 18:55:22 +0000264 static const struct watchdog_info ident = {
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100265 .identity = "IT8712F Watchdog",
266 .firmware_version = 1,
Wim Van Sebroecke73a7802009-05-11 18:33:00 +0000267 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
268 WDIOF_MAGICCLOSE,
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100269 };
Andrew Paprocki5e699602008-02-10 22:11:15 -0500270 int value;
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700271 int ret;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100272
273 switch (cmd) {
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100274 case WDIOC_GETSUPPORT:
275 if (copy_to_user(argp, &ident, sizeof(ident)))
276 return -EFAULT;
277 return 0;
278 case WDIOC_GETSTATUS:
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700279 ret = superio_enter();
280 if (ret)
281 return ret;
Andrew Paprocki5e699602008-02-10 22:11:15 -0500282 superio_select(LDN_GPIO);
283
284 value = it8712f_wdt_get_status();
285
286 superio_exit();
287
288 return put_user(value, p);
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100289 case WDIOC_GETBOOTSTATUS:
290 return put_user(0, p);
291 case WDIOC_KEEPALIVE:
292 it8712f_wdt_ping();
293 return 0;
294 case WDIOC_SETTIMEOUT:
Andrew Paprocki5e699602008-02-10 22:11:15 -0500295 if (get_user(value, p))
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100296 return -EFAULT;
Andrew Paprocki5e699602008-02-10 22:11:15 -0500297 if (value < 1)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100298 return -EINVAL;
Andrew Paprocki5e699602008-02-10 22:11:15 -0500299 if (value > (max_units * 60))
300 return -EINVAL;
301 margin = value;
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700302 ret = superio_enter();
303 if (ret)
304 return ret;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100305 superio_select(LDN_GPIO);
306
307 it8712f_wdt_update_margin();
308
309 superio_exit();
310 it8712f_wdt_ping();
Andrew Paprocki5e699602008-02-10 22:11:15 -0500311 /* Fall through */
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100312 case WDIOC_GETTIMEOUT:
313 if (put_user(margin, p))
314 return -EFAULT;
315 return 0;
Wim Van Sebroeck0c06090c2008-07-18 11:41:17 +0000316 default:
317 return -ENOTTY;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100318 }
319}
320
Alan Coxd6547372008-08-04 17:54:01 +0100321static int it8712f_wdt_open(struct inode *inode, struct file *file)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100322{
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700323 int ret;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100324 /* only allow one at a time */
Alan Coxd6547372008-08-04 17:54:01 +0100325 if (test_and_set_bit(0, &wdt_open))
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100326 return -EBUSY;
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700327
328 ret = it8712f_wdt_enable();
329 if (ret)
330 return ret;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100331 return nonseekable_open(inode, file);
332}
333
Alan Coxd6547372008-08-04 17:54:01 +0100334static int it8712f_wdt_release(struct inode *inode, struct file *file)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100335{
336 if (expect_close != 42) {
Joe Perches27c766a2012-02-15 15:06:19 -0800337 pr_warn("watchdog device closed unexpectedly, will not disable the watchdog timer\n");
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100338 } else if (!nowayout) {
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700339 if (it8712f_wdt_disable())
Joe Perches27c766a2012-02-15 15:06:19 -0800340 pr_warn("Watchdog disable failed\n");
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100341 }
342 expect_close = 0;
Alan Coxd6547372008-08-04 17:54:01 +0100343 clear_bit(0, &wdt_open);
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100344
345 return 0;
346}
347
Jan Engelhardtb47a1662008-01-22 20:48:10 +0100348static const struct file_operations it8712f_wdt_fops = {
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100349 .owner = THIS_MODULE,
350 .llseek = no_llseek,
351 .write = it8712f_wdt_write,
Alan Coxd6547372008-08-04 17:54:01 +0100352 .unlocked_ioctl = it8712f_wdt_ioctl,
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100353 .open = it8712f_wdt_open,
354 .release = it8712f_wdt_release,
355};
356
357static struct miscdevice it8712f_wdt_miscdev = {
358 .minor = WATCHDOG_MINOR,
359 .name = "watchdog",
360 .fops = &it8712f_wdt_fops,
361};
362
Alan Coxd6547372008-08-04 17:54:01 +0100363static int __init it8712f_wdt_find(unsigned short *address)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100364{
365 int err = -ENODEV;
366 int chip_type;
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700367 int ret = superio_enter();
368 if (ret)
369 return ret;
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100370
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100371 chip_type = superio_inw(DEVID);
372 if (chip_type != IT8712F_DEVID)
373 goto exit;
374
375 superio_select(LDN_GAME);
376 superio_outb(1, ACT_REG);
377 if (!(superio_inb(ACT_REG) & 0x01)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800378 pr_err("Device not activated, skipping\n");
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100379 goto exit;
380 }
381
382 *address = superio_inw(BASE_REG);
383 if (*address == 0) {
Joe Perches27c766a2012-02-15 15:06:19 -0800384 pr_err("Base address not set, skipping\n");
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100385 goto exit;
386 }
387
388 err = 0;
Andrew Paprocki5e699602008-02-10 22:11:15 -0500389 revision = superio_inb(DEVREV) & 0x0f;
390
391 /* Later revisions have 16-bit values per datasheet 0.9.1 */
392 if (revision >= 0x08)
393 max_units = 65535;
394
395 if (margin > (max_units * 60))
396 margin = (max_units * 60);
397
Joe Perches27c766a2012-02-15 15:06:19 -0800398 pr_info("Found IT%04xF chip revision %d - using DogFood address 0x%x\n",
Andrew Paprocki5e699602008-02-10 22:11:15 -0500399 chip_type, revision, *address);
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100400
401exit:
402 superio_exit();
403 return err;
404}
405
Alan Coxd6547372008-08-04 17:54:01 +0100406static int __init it8712f_wdt_init(void)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100407{
408 int err = 0;
409
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100410 if (it8712f_wdt_find(&address))
411 return -ENODEV;
412
413 if (!request_region(address, 1, "IT8712F Watchdog")) {
Joe Perches27c766a2012-02-15 15:06:19 -0800414 pr_warn("watchdog I/O region busy\n");
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100415 return -EBUSY;
416 }
417
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700418 err = it8712f_wdt_disable();
419 if (err) {
Joe Perches27c766a2012-02-15 15:06:19 -0800420 pr_err("unable to disable watchdog timer\n");
Nat Gurumoorthya134b822011-05-09 11:45:07 -0700421 goto out;
422 }
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100423
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100424 err = register_reboot_notifier(&it8712f_wdt_notifier);
425 if (err) {
Joe Perches27c766a2012-02-15 15:06:19 -0800426 pr_err("unable to register reboot notifier\n");
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100427 goto out;
428 }
429
430 err = misc_register(&it8712f_wdt_miscdev);
431 if (err) {
Joe Perches27c766a2012-02-15 15:06:19 -0800432 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
433 WATCHDOG_MINOR, err);
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100434 goto reboot_out;
435 }
436
437 return 0;
438
439
440reboot_out:
441 unregister_reboot_notifier(&it8712f_wdt_notifier);
442out:
443 release_region(address, 1);
444 return err;
445}
446
Alan Coxd6547372008-08-04 17:54:01 +0100447static void __exit it8712f_wdt_exit(void)
Jorge Boncompte [DTI2]38ff6fd2007-11-19 15:09:21 +0100448{
449 misc_deregister(&it8712f_wdt_miscdev);
450 unregister_reboot_notifier(&it8712f_wdt_notifier);
451 release_region(address, 1);
452}
453
454module_init(it8712f_wdt_init);
455module_exit(it8712f_wdt_exit);