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1/*
2 * w83627hf/thf WDT driver
3 *
4 * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
5 * added support for W83627THF.
6 *
7 * (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com>
8 *
9 * Based on advantechwdt.c which is based on wdt.c.
10 * Original copyright messages:
11 *
12 * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
13 *
14 * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
15 * All Rights Reserved.
16 *
17 * This program is free software; you can redistribute it and/or
18 * modify it under the terms of the GNU General Public License
19 * as published by the Free Software Foundation; either version
20 * 2 of the License, or (at your option) any later version.
21 *
22 * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
23 * warranty for any of this software. This material is provided
24 * "AS-IS" and at no charge.
25 *
26 * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
27 */
28
29#include <linux/module.h>
30#include <linux/moduleparam.h>
31#include <linux/types.h>
32#include <linux/miscdevice.h>
33#include <linux/watchdog.h>
34#include <linux/fs.h>
35#include <linux/ioport.h>
36#include <linux/notifier.h>
37#include <linux/reboot.h>
38#include <linux/init.h>
39#include <linux/spinlock.h>
40#include <linux/io.h>
41#include <linux/uaccess.h>
42
43#include <asm/system.h>
44
45#define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
46#define PFX WATCHDOG_NAME ": "
47#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
48
49static unsigned long wdt_is_open;
50static char expect_close;
51static DEFINE_SPINLOCK(io_lock);
52
53/* You must set this - there is no sane way to probe for this board. */
54static int wdt_io = 0x2E;
55module_param(wdt_io, int, 0);
56MODULE_PARM_DESC(wdt_io, "w83627hf/thf WDT io port (default 0x2E)");
57
58static int timeout = WATCHDOG_TIMEOUT; /* in seconds */
59module_param(timeout, int, 0);
60MODULE_PARM_DESC(timeout,
61 "Watchdog timeout in seconds. 1 <= timeout <= 255, default="
62 __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
63
64static int nowayout = WATCHDOG_NOWAYOUT;
65module_param(nowayout, int, 0);
66MODULE_PARM_DESC(nowayout,
67 "Watchdog cannot be stopped once started (default="
68 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
69
70/*
71 * Kernel methods.
72 */
73
74#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
75#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register
76 (same as EFER) */
77#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
78
79static void w83627hf_select_wd_register(void)
80{
81 unsigned char c;
82 outb_p(0x87, WDT_EFER); /* Enter extended function mode */
83 outb_p(0x87, WDT_EFER); /* Again according to manual */
84
85 outb(0x20, WDT_EFER); /* check chip version */
86 c = inb(WDT_EFDR);
87 if (c == 0x82) { /* W83627THF */
88 outb_p(0x2b, WDT_EFER); /* select GPIO3 */
89 c = ((inb_p(WDT_EFDR) & 0xf7) | 0x04); /* select WDT0 */
90 outb_p(0x2b, WDT_EFER);
91 outb_p(c, WDT_EFDR); /* set GPIO3 to WDT0 */
92 } else if (c == 0x88 || c == 0xa0) { /* W83627EHF / W83627DHG */
93 outb_p(0x2d, WDT_EFER); /* select GPIO5 */
94 c = inb_p(WDT_EFDR) & ~0x01; /* PIN77 -> WDT0# */
95 outb_p(0x2d, WDT_EFER);
96 outb_p(c, WDT_EFDR); /* set GPIO5 to WDT0 */
97 }
98
99 outb_p(0x07, WDT_EFER); /* point to logical device number reg */
100 outb_p(0x08, WDT_EFDR); /* select logical device 8 (GPIO2) */
101 outb_p(0x30, WDT_EFER); /* select CR30 */
102 outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */
103}
104
105static void w83627hf_unselect_wd_register(void)
106{
107 outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
108}
109
110/* tyan motherboards seem to set F5 to 0x4C ?
111 * So explicitly init to appropriate value. */
112
113static void w83627hf_init(void)
114{
115 unsigned char t;
116
117 w83627hf_select_wd_register();
118
119 outb_p(0xF6, WDT_EFER); /* Select CRF6 */
120 t = inb_p(WDT_EFDR); /* read CRF6 */
121 if (t != 0) {
122 printk(KERN_INFO PFX
123 "Watchdog already running. Resetting timeout to %d sec\n",
124 timeout);
125 outb_p(timeout, WDT_EFDR); /* Write back to CRF6 */
126 }
127
128 outb_p(0xF5, WDT_EFER); /* Select CRF5 */
129 t = inb_p(WDT_EFDR); /* read CRF5 */
130 t &= ~0x0C; /* set second mode & disable keyboard
131 turning off watchdog */
132 t |= 0x02; /* enable the WDTO# output low pulse
133 to the KBRST# pin (PIN60) */
134 outb_p(t, WDT_EFDR); /* Write back to CRF5 */
135
136 outb_p(0xF7, WDT_EFER); /* Select CRF7 */
137 t = inb_p(WDT_EFDR); /* read CRF7 */
138 t &= ~0xC0; /* disable keyboard & mouse turning off
139 watchdog */
140 outb_p(t, WDT_EFDR); /* Write back to CRF7 */
141
142 w83627hf_unselect_wd_register();
143}
144
145static void wdt_ctrl(int timeout)
146{
147 spin_lock(&io_lock);
148
149 w83627hf_select_wd_register();
150
151 outb_p(0xF6, WDT_EFER); /* Select CRF6 */
152 outb_p(timeout, WDT_EFDR); /* Write Timeout counter to CRF6 */
153
154 w83627hf_unselect_wd_register();
155
156 spin_unlock(&io_lock);
157}
158
159static int wdt_ping(void)
160{
161 wdt_ctrl(timeout);
162 return 0;
163}
164
165static int wdt_disable(void)
166{
167 wdt_ctrl(0);
168 return 0;
169}
170
171static int wdt_set_heartbeat(int t)
172{
173 if (t < 1 || t > 255)
174 return -EINVAL;
175 timeout = t;
176 return 0;
177}
178
179static ssize_t wdt_write(struct file *file, const char __user *buf,
180 size_t count, loff_t *ppos)
181{
182 if (count) {
183 if (!nowayout) {
184 size_t i;
185
186 expect_close = 0;
187
188 for (i = 0; i != count; i++) {
189 char c;
190 if (get_user(c, buf + i))
191 return -EFAULT;
192 if (c == 'V')
193 expect_close = 42;
194 }
195 }
196 wdt_ping();
197 }
198 return count;
199}
200
201static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
202{
203 void __user *argp = (void __user *)arg;
204 int __user *p = argp;
205 int new_timeout;
206 static const struct watchdog_info ident = {
207 .options = WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT |
208 WDIOF_MAGICCLOSE,
209 .firmware_version = 1,
210 .identity = "W83627HF WDT",
211 };
212
213 switch (cmd) {
214 case WDIOC_GETSUPPORT:
215 if (copy_to_user(argp, &ident, sizeof(ident)))
216 return -EFAULT;
217 break;
218 case WDIOC_GETSTATUS:
219 case WDIOC_GETBOOTSTATUS:
220 return put_user(0, p);
221 case WDIOC_SETOPTIONS:
222 {
223 int options, retval = -EINVAL;
224
225 if (get_user(options, p))
226 return -EFAULT;
227 if (options & WDIOS_DISABLECARD) {
228 wdt_disable();
229 retval = 0;
230 }
231 if (options & WDIOS_ENABLECARD) {
232 wdt_ping();
233 retval = 0;
234 }
235 return retval;
236 }
237 case WDIOC_KEEPALIVE:
238 wdt_ping();
239 break;
240 case WDIOC_SETTIMEOUT:
241 if (get_user(new_timeout, p))
242 return -EFAULT;
243 if (wdt_set_heartbeat(new_timeout))
244 return -EINVAL;
245 wdt_ping();
246 /* Fall */
247 case WDIOC_GETTIMEOUT:
248 return put_user(timeout, p);
249 default:
250 return -ENOTTY;
251 }
252 return 0;
253}
254
255static int wdt_open(struct inode *inode, struct file *file)
256{
257 if (test_and_set_bit(0, &wdt_is_open))
258 return -EBUSY;
259 /*
260 * Activate
261 */
262
263 wdt_ping();
264 return nonseekable_open(inode, file);
265}
266
267static int wdt_close(struct inode *inode, struct file *file)
268{
269 if (expect_close == 42)
270 wdt_disable();
271 else {
272 printk(KERN_CRIT PFX
273 "Unexpected close, not stopping watchdog!\n");
274 wdt_ping();
275 }
276 expect_close = 0;
277 clear_bit(0, &wdt_is_open);
278 return 0;
279}
280
281/*
282 * Notifier for system down
283 */
284
285static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
286 void *unused)
287{
288 if (code == SYS_DOWN || code == SYS_HALT)
289 wdt_disable(); /* Turn the WDT off */
290
291 return NOTIFY_DONE;
292}
293
294/*
295 * Kernel Interfaces
296 */
297
298static const struct file_operations wdt_fops = {
299 .owner = THIS_MODULE,
300 .llseek = no_llseek,
301 .write = wdt_write,
302 .unlocked_ioctl = wdt_ioctl,
303 .open = wdt_open,
304 .release = wdt_close,
305};
306
307static struct miscdevice wdt_miscdev = {
308 .minor = WATCHDOG_MINOR,
309 .name = "watchdog",
310 .fops = &wdt_fops,
311};
312
313/*
314 * The WDT needs to learn about soft shutdowns in order to
315 * turn the timebomb registers off.
316 */
317
318static struct notifier_block wdt_notifier = {
319 .notifier_call = wdt_notify_sys,
320};
321
322static int __init wdt_init(void)
323{
324 int ret;
325
326 printk(KERN_INFO "WDT driver for the Winbond(TM) W83627HF/THF/HG/DHG Super I/O chip initialising.\n");
327
328 if (wdt_set_heartbeat(timeout)) {
329 wdt_set_heartbeat(WATCHDOG_TIMEOUT);
330 printk(KERN_INFO PFX
331 "timeout value must be 1 <= timeout <= 255, using %d\n",
332 WATCHDOG_TIMEOUT);
333 }
334
335 if (!request_region(wdt_io, 1, WATCHDOG_NAME)) {
336 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
337 wdt_io);
338 ret = -EIO;
339 goto out;
340 }
341
342 w83627hf_init();
343
344 ret = register_reboot_notifier(&wdt_notifier);
345 if (ret != 0) {
346 printk(KERN_ERR PFX
347 "cannot register reboot notifier (err=%d)\n", ret);
348 goto unreg_regions;
349 }
350
351 ret = misc_register(&wdt_miscdev);
352 if (ret != 0) {
353 printk(KERN_ERR PFX
354 "cannot register miscdev on minor=%d (err=%d)\n",
355 WATCHDOG_MINOR, ret);
356 goto unreg_reboot;
357 }
358
359 printk(KERN_INFO PFX
360 "initialized. timeout=%d sec (nowayout=%d)\n",
361 timeout, nowayout);
362
363out:
364 return ret;
365unreg_reboot:
366 unregister_reboot_notifier(&wdt_notifier);
367unreg_regions:
368 release_region(wdt_io, 1);
369 goto out;
370}
371
372static void __exit wdt_exit(void)
373{
374 misc_deregister(&wdt_miscdev);
375 unregister_reboot_notifier(&wdt_notifier);
376 release_region(wdt_io, 1);
377}
378
379module_init(wdt_init);
380module_exit(wdt_exit);
381
382MODULE_LICENSE("GPL");
383MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>");
384MODULE_DESCRIPTION("w83627hf/thf WDT driver");
385MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
1/*
2 * w83627hf/thf WDT driver
3 *
4 * (c) Copyright 2013 Guenter Roeck
5 * converted to watchdog infrastructure
6 *
7 * (c) Copyright 2007 Vlad Drukker <vlad@storewiz.com>
8 * added support for W83627THF.
9 *
10 * (c) Copyright 2003,2007 Pádraig Brady <P@draigBrady.com>
11 *
12 * Based on advantechwdt.c which is based on wdt.c.
13 * Original copyright messages:
14 *
15 * (c) Copyright 2000-2001 Marek Michalkiewicz <marekm@linux.org.pl>
16 *
17 * (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
18 * All Rights Reserved.
19 *
20 * This program is free software; you can redistribute it and/or
21 * modify it under the terms of the GNU General Public License
22 * as published by the Free Software Foundation; either version
23 * 2 of the License, or (at your option) any later version.
24 *
25 * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
26 * warranty for any of this software. This material is provided
27 * "AS-IS" and at no charge.
28 *
29 * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
30 */
31
32#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
33
34#include <linux/module.h>
35#include <linux/moduleparam.h>
36#include <linux/types.h>
37#include <linux/watchdog.h>
38#include <linux/ioport.h>
39#include <linux/notifier.h>
40#include <linux/reboot.h>
41#include <linux/init.h>
42#include <linux/io.h>
43
44#define WATCHDOG_NAME "w83627hf/thf/hg/dhg WDT"
45#define WATCHDOG_TIMEOUT 60 /* 60 sec default timeout */
46
47static int wdt_io;
48static int cr_wdt_timeout; /* WDT timeout register */
49static int cr_wdt_control; /* WDT control register */
50
51enum chips { w83627hf, w83627s, w83697hf, w83697ug, w83637hf, w83627thf,
52 w83687thf, w83627ehf, w83627dhg, w83627uhg, w83667hg, w83627dhg_p,
53 w83667hg_b, nct6775, nct6776, nct6779 };
54
55static int timeout; /* in seconds */
56module_param(timeout, int, 0);
57MODULE_PARM_DESC(timeout,
58 "Watchdog timeout in seconds. 1 <= timeout <= 255, default="
59 __MODULE_STRING(WATCHDOG_TIMEOUT) ".");
60
61static bool nowayout = WATCHDOG_NOWAYOUT;
62module_param(nowayout, bool, 0);
63MODULE_PARM_DESC(nowayout,
64 "Watchdog cannot be stopped once started (default="
65 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
66
67/*
68 * Kernel methods.
69 */
70
71#define WDT_EFER (wdt_io+0) /* Extended Function Enable Registers */
72#define WDT_EFIR (wdt_io+0) /* Extended Function Index Register
73 (same as EFER) */
74#define WDT_EFDR (WDT_EFIR+1) /* Extended Function Data Register */
75
76#define W83627HF_LD_WDT 0x08
77
78#define W83627HF_ID 0x52
79#define W83627S_ID 0x59
80#define W83697HF_ID 0x60
81#define W83697UG_ID 0x68
82#define W83637HF_ID 0x70
83#define W83627THF_ID 0x82
84#define W83687THF_ID 0x85
85#define W83627EHF_ID 0x88
86#define W83627DHG_ID 0xa0
87#define W83627UHG_ID 0xa2
88#define W83667HG_ID 0xa5
89#define W83627DHG_P_ID 0xb0
90#define W83667HG_B_ID 0xb3
91#define NCT6775_ID 0xb4
92#define NCT6776_ID 0xc3
93#define NCT6779_ID 0xc5
94
95#define W83627HF_WDT_TIMEOUT 0xf6
96#define W83697HF_WDT_TIMEOUT 0xf4
97
98#define W83627HF_WDT_CONTROL 0xf5
99#define W83697HF_WDT_CONTROL 0xf3
100
101static void superio_outb(int reg, int val)
102{
103 outb(reg, WDT_EFER);
104 outb(val, WDT_EFDR);
105}
106
107static inline int superio_inb(int reg)
108{
109 outb(reg, WDT_EFER);
110 return inb(WDT_EFDR);
111}
112
113static int superio_enter(void)
114{
115 if (!request_muxed_region(wdt_io, 2, WATCHDOG_NAME))
116 return -EBUSY;
117
118 outb_p(0x87, WDT_EFER); /* Enter extended function mode */
119 outb_p(0x87, WDT_EFER); /* Again according to manual */
120
121 return 0;
122}
123
124static void superio_select(int ld)
125{
126 superio_outb(0x07, ld);
127}
128
129static void superio_exit(void)
130{
131 outb_p(0xAA, WDT_EFER); /* Leave extended function mode */
132 release_region(wdt_io, 2);
133}
134
135static int w83627hf_init(struct watchdog_device *wdog, enum chips chip)
136{
137 int ret;
138 unsigned char t;
139
140 ret = superio_enter();
141 if (ret)
142 return ret;
143
144 superio_select(W83627HF_LD_WDT);
145
146 /* set CR30 bit 0 to activate GPIO2 */
147 t = superio_inb(0x30);
148 if (!(t & 0x01))
149 superio_outb(0x30, t | 0x01);
150
151 switch (chip) {
152 case w83627hf:
153 case w83627s:
154 t = superio_inb(0x2B) & ~0x10;
155 superio_outb(0x2B, t); /* set GPIO24 to WDT0 */
156 break;
157 case w83697hf:
158 /* Set pin 119 to WDTO# mode (= CR29, WDT0) */
159 t = superio_inb(0x29) & ~0x60;
160 t |= 0x20;
161 superio_outb(0x29, t);
162 break;
163 case w83697ug:
164 /* Set pin 118 to WDTO# mode */
165 t = superio_inb(0x2b) & ~0x04;
166 superio_outb(0x2b, t);
167 break;
168 case w83627thf:
169 t = (superio_inb(0x2B) & ~0x08) | 0x04;
170 superio_outb(0x2B, t); /* set GPIO3 to WDT0 */
171 break;
172 case w83627dhg:
173 case w83627dhg_p:
174 t = superio_inb(0x2D) & ~0x01; /* PIN77 -> WDT0# */
175 superio_outb(0x2D, t); /* set GPIO5 to WDT0 */
176 t = superio_inb(cr_wdt_control);
177 t |= 0x02; /* enable the WDTO# output low pulse
178 * to the KBRST# pin */
179 superio_outb(cr_wdt_control, t);
180 break;
181 case w83637hf:
182 break;
183 case w83687thf:
184 t = superio_inb(0x2C) & ~0x80; /* PIN47 -> WDT0# */
185 superio_outb(0x2C, t);
186 break;
187 case w83627ehf:
188 case w83627uhg:
189 case w83667hg:
190 case w83667hg_b:
191 case nct6775:
192 case nct6776:
193 case nct6779:
194 /*
195 * These chips have a fixed WDTO# output pin (W83627UHG),
196 * or support more than one WDTO# output pin.
197 * Don't touch its configuration, and hope the BIOS
198 * does the right thing.
199 */
200 t = superio_inb(cr_wdt_control);
201 t |= 0x02; /* enable the WDTO# output low pulse
202 * to the KBRST# pin */
203 superio_outb(cr_wdt_control, t);
204 break;
205 default:
206 break;
207 }
208
209 t = superio_inb(cr_wdt_timeout);
210 if (t != 0) {
211 pr_info("Watchdog already running. Resetting timeout to %d sec\n",
212 wdog->timeout);
213 superio_outb(cr_wdt_timeout, wdog->timeout);
214 }
215
216 /* set second mode & disable keyboard turning off watchdog */
217 t = superio_inb(cr_wdt_control) & ~0x0C;
218 superio_outb(cr_wdt_control, t);
219
220 /* reset trigger, disable keyboard & mouse turning off watchdog */
221 t = superio_inb(0xF7) & ~0xD0;
222 superio_outb(0xF7, t);
223
224 superio_exit();
225
226 return 0;
227}
228
229static int wdt_set_time(unsigned int timeout)
230{
231 int ret;
232
233 ret = superio_enter();
234 if (ret)
235 return ret;
236
237 superio_select(W83627HF_LD_WDT);
238 superio_outb(cr_wdt_timeout, timeout);
239 superio_exit();
240
241 return 0;
242}
243
244static int wdt_start(struct watchdog_device *wdog)
245{
246 return wdt_set_time(wdog->timeout);
247}
248
249static int wdt_stop(struct watchdog_device *wdog)
250{
251 return wdt_set_time(0);
252}
253
254static int wdt_set_timeout(struct watchdog_device *wdog, unsigned int timeout)
255{
256 wdog->timeout = timeout;
257
258 return 0;
259}
260
261static unsigned int wdt_get_time(struct watchdog_device *wdog)
262{
263 unsigned int timeleft;
264 int ret;
265
266 ret = superio_enter();
267 if (ret)
268 return 0;
269
270 superio_select(W83627HF_LD_WDT);
271 timeleft = superio_inb(cr_wdt_timeout);
272 superio_exit();
273
274 return timeleft;
275}
276
277/*
278 * Notifier for system down
279 */
280static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
281 void *unused)
282{
283 if (code == SYS_DOWN || code == SYS_HALT)
284 wdt_set_time(0); /* Turn the WDT off */
285
286 return NOTIFY_DONE;
287}
288
289/*
290 * Kernel Interfaces
291 */
292
293static struct watchdog_info wdt_info = {
294 .options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
295 .identity = "W83627HF Watchdog",
296};
297
298static struct watchdog_ops wdt_ops = {
299 .owner = THIS_MODULE,
300 .start = wdt_start,
301 .stop = wdt_stop,
302 .set_timeout = wdt_set_timeout,
303 .get_timeleft = wdt_get_time,
304};
305
306static struct watchdog_device wdt_dev = {
307 .info = &wdt_info,
308 .ops = &wdt_ops,
309 .timeout = WATCHDOG_TIMEOUT,
310 .min_timeout = 1,
311 .max_timeout = 255,
312};
313
314/*
315 * The WDT needs to learn about soft shutdowns in order to
316 * turn the timebomb registers off.
317 */
318
319static struct notifier_block wdt_notifier = {
320 .notifier_call = wdt_notify_sys,
321};
322
323static int wdt_find(int addr)
324{
325 u8 val;
326 int ret;
327
328 cr_wdt_timeout = W83627HF_WDT_TIMEOUT;
329 cr_wdt_control = W83627HF_WDT_CONTROL;
330
331 ret = superio_enter();
332 if (ret)
333 return ret;
334 superio_select(W83627HF_LD_WDT);
335 val = superio_inb(0x20);
336 switch (val) {
337 case W83627HF_ID:
338 ret = w83627hf;
339 break;
340 case W83627S_ID:
341 ret = w83627s;
342 break;
343 case W83697HF_ID:
344 ret = w83697hf;
345 cr_wdt_timeout = W83697HF_WDT_TIMEOUT;
346 cr_wdt_control = W83697HF_WDT_CONTROL;
347 break;
348 case W83697UG_ID:
349 ret = w83697ug;
350 cr_wdt_timeout = W83697HF_WDT_TIMEOUT;
351 cr_wdt_control = W83697HF_WDT_CONTROL;
352 break;
353 case W83637HF_ID:
354 ret = w83637hf;
355 break;
356 case W83627THF_ID:
357 ret = w83627thf;
358 break;
359 case W83687THF_ID:
360 ret = w83687thf;
361 break;
362 case W83627EHF_ID:
363 ret = w83627ehf;
364 break;
365 case W83627DHG_ID:
366 ret = w83627dhg;
367 break;
368 case W83627DHG_P_ID:
369 ret = w83627dhg_p;
370 break;
371 case W83627UHG_ID:
372 ret = w83627uhg;
373 break;
374 case W83667HG_ID:
375 ret = w83667hg;
376 break;
377 case W83667HG_B_ID:
378 ret = w83667hg_b;
379 break;
380 case NCT6775_ID:
381 ret = nct6775;
382 break;
383 case NCT6776_ID:
384 ret = nct6776;
385 break;
386 case NCT6779_ID:
387 ret = nct6779;
388 break;
389 case 0xff:
390 ret = -ENODEV;
391 break;
392 default:
393 ret = -ENODEV;
394 pr_err("Unsupported chip ID: 0x%02x\n", val);
395 break;
396 }
397 superio_exit();
398 return ret;
399}
400
401static int __init wdt_init(void)
402{
403 int ret;
404 int chip;
405 const char * const chip_name[] = {
406 "W83627HF",
407 "W83627S",
408 "W83697HF",
409 "W83697UG",
410 "W83637HF",
411 "W83627THF",
412 "W83687THF",
413 "W83627EHF",
414 "W83627DHG",
415 "W83627UHG",
416 "W83667HG",
417 "W83667DHG-P",
418 "W83667HG-B",
419 "NCT6775",
420 "NCT6776",
421 "NCT6779",
422 };
423
424 wdt_io = 0x2e;
425 chip = wdt_find(0x2e);
426 if (chip < 0) {
427 wdt_io = 0x4e;
428 chip = wdt_find(0x4e);
429 if (chip < 0)
430 return chip;
431 }
432
433 pr_info("WDT driver for %s Super I/O chip initialising\n",
434 chip_name[chip]);
435
436 watchdog_init_timeout(&wdt_dev, timeout, NULL);
437 watchdog_set_nowayout(&wdt_dev, nowayout);
438
439 ret = w83627hf_init(&wdt_dev, chip);
440 if (ret) {
441 pr_err("failed to initialize watchdog (err=%d)\n", ret);
442 return ret;
443 }
444
445 ret = register_reboot_notifier(&wdt_notifier);
446 if (ret != 0) {
447 pr_err("cannot register reboot notifier (err=%d)\n", ret);
448 return ret;
449 }
450
451 ret = watchdog_register_device(&wdt_dev);
452 if (ret)
453 goto unreg_reboot;
454
455 pr_info("initialized. timeout=%d sec (nowayout=%d)\n",
456 wdt_dev.timeout, nowayout);
457
458 return ret;
459
460unreg_reboot:
461 unregister_reboot_notifier(&wdt_notifier);
462 return ret;
463}
464
465static void __exit wdt_exit(void)
466{
467 watchdog_unregister_device(&wdt_dev);
468 unregister_reboot_notifier(&wdt_notifier);
469}
470
471module_init(wdt_init);
472module_exit(wdt_exit);
473
474MODULE_LICENSE("GPL");
475MODULE_AUTHOR("Pádraig Brady <P@draigBrady.com>");
476MODULE_DESCRIPTION("w83627hf/thf WDT driver");