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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Industrial Computer Source PCI-WDT500/501 driver
3 *
Alan Cox29fa0582008-10-27 15:17:56 +00004 * (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +00005 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 *
12 * Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
13 * warranty for any of this software. This material is provided
14 * "AS-IS" and at no charge.
15 *
16 * (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
17 *
18 * Release 0.10.
19 *
20 * Fixes
21 * Dave Gregorich : Modularisation and minor bugs
22 * Alan Cox : Added the watchdog ioctl() stuff
23 * Alan Cox : Fixed the reboot problem (as noted by
24 * Matt Crocker).
25 * Alan Cox : Added wdt= boot option
26 * Alan Cox : Cleaned up copy/user stuff
27 * Tim Hockin : Added insmod parameters, comment cleanup
28 * Parameterized timeout
29 * JP Nollmann : Added support for PCI wdt501p
30 * Alan Cox : Split ISA and PCI cards into two drivers
31 * Jeff Garzik : PCI cleanups
Alan Cox9f2d1f02008-08-04 17:55:35 +010032 * Tigran Aivazian : Restructured wdtpci_init_one() to handle
33 * failures
Wim Van Sebroeck5f3b2752011-02-23 20:04:38 +000034 * Joel Becker : Added WDIOC_GET/SETTIMEOUT
Alan Cox9f2d1f02008-08-04 17:55:35 +010035 * Zwane Mwaikambo : Magic char closing, locking changes,
36 * cleanups
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 * Matt Domsch : nowayout module option
38 */
39
Joe Perches27c766a2012-02-15 15:06:19 -080040#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
41
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <linux/interrupt.h>
43#include <linux/module.h>
44#include <linux/moduleparam.h>
45#include <linux/types.h>
46#include <linux/miscdevice.h>
47#include <linux/watchdog.h>
48#include <linux/ioport.h>
Andrew Morton81830062008-08-04 17:56:02 +010049#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/notifier.h>
51#include <linux/reboot.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/fs.h>
53#include <linux/pci.h>
Alan Cox9f2d1f02008-08-04 17:55:35 +010054#include <linux/io.h>
55#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
58#define WDT_IS_PCI
59#include "wd501p.h"
60
Linus Torvalds1da177e2005-04-16 15:20:36 -070061/* We can only use 1 card due to the /dev/watchdog restriction */
62static int dev_count;
63
Alan Cox9f2d1f02008-08-04 17:55:35 +010064static unsigned long open_lock;
Alexey Dobriyanc7dfd0c2007-11-01 16:27:08 -070065static DEFINE_SPINLOCK(wdtpci_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066static char expect_close;
67
Randy Dunlapd1833c22009-08-07 15:02:00 -070068static resource_size_t io;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069static int irq;
70
71/* Default timeout */
72#define WD_TIMO 60 /* Default heartbeat = 60 seconds */
73
74static int heartbeat = WD_TIMO;
75static int wd_heartbeat;
76module_param(heartbeat, int, 0);
Alan Cox9f2d1f02008-08-04 17:55:35 +010077MODULE_PARM_DESC(heartbeat,
78 "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
79 __MODULE_STRING(WD_TIMO) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +010081static bool nowayout = WATCHDOG_NOWAYOUT;
82module_param(nowayout, bool, 0);
Alan Cox9f2d1f02008-08-04 17:55:35 +010083MODULE_PARM_DESC(nowayout,
84 "Watchdog cannot be stopped once started (default="
85 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Linus Torvalds1da177e2005-04-16 15:20:36 -070087/* Support for the Fan Tachometer on the PCI-WDT501 */
88static int tachometer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089module_param(tachometer, int, 0);
Alan Cox9f2d1f02008-08-04 17:55:35 +010090MODULE_PARM_DESC(tachometer,
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +000091 "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
92
93static int type = 500;
94module_param(type, int, 0);
95MODULE_PARM_DESC(type,
96 "PCI-WDT501 Card type (500 or 501 , default=500)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98/*
99 * Programming support
100 */
101
102static void wdtpci_ctr_mode(int ctr, int mode)
103{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100104 ctr <<= 6;
105 ctr |= 0x30;
106 ctr |= (mode << 1);
107 outb(ctr, WDT_CR);
108 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109}
110
111static void wdtpci_ctr_load(int ctr, int val)
112{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100113 outb(val & 0xFF, WDT_COUNT0 + ctr);
114 udelay(8);
115 outb(val >> 8, WDT_COUNT0 + ctr);
116 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117}
118
119/**
120 * wdtpci_start:
121 *
122 * Start the watchdog driver.
123 */
124
125static int wdtpci_start(void)
126{
127 unsigned long flags;
128
129 spin_lock_irqsave(&wdtpci_lock, flags);
130
131 /*
132 * "pet" the watchdog, as Access says.
133 * This resets the clock outputs.
134 */
Alan Cox9f2d1f02008-08-04 17:55:35 +0100135 inb(WDT_DC); /* Disable watchdog */
136 udelay(8);
137 wdtpci_ctr_mode(2, 0); /* Program CTR2 for Mode 0:
138 Pulse on Terminal Count */
139 outb(0, WDT_DC); /* Enable watchdog */
140 udelay(8);
141 inb(WDT_DC); /* Disable watchdog */
142 udelay(8);
143 outb(0, WDT_CLOCK); /* 2.0833MHz clock */
144 udelay(8);
145 inb(WDT_BUZZER); /* disable */
146 udelay(8);
147 inb(WDT_OPTONOTRST); /* disable */
148 udelay(8);
149 inb(WDT_OPTORST); /* disable */
150 udelay(8);
151 inb(WDT_PROGOUT); /* disable */
152 udelay(8);
153 wdtpci_ctr_mode(0, 3); /* Program CTR0 for Mode 3:
154 Square Wave Generator */
155 wdtpci_ctr_mode(1, 2); /* Program CTR1 for Mode 2:
156 Rate Generator */
157 wdtpci_ctr_mode(2, 1); /* Program CTR2 for Mode 1:
158 Retriggerable One-Shot */
159 wdtpci_ctr_load(0, 20833); /* count at 100Hz */
160 wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 /* DO NOT LOAD CTR2 on PCI card! -- JPN */
Alan Cox9f2d1f02008-08-04 17:55:35 +0100162 outb(0, WDT_DC); /* Enable watchdog */
163 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 spin_unlock_irqrestore(&wdtpci_lock, flags);
166 return 0;
167}
168
169/**
170 * wdtpci_stop:
171 *
172 * Stop the watchdog driver.
173 */
174
Alan Cox9f2d1f02008-08-04 17:55:35 +0100175static int wdtpci_stop(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
177 unsigned long flags;
178
179 /* Turn the card off */
180 spin_lock_irqsave(&wdtpci_lock, flags);
Alan Cox9f2d1f02008-08-04 17:55:35 +0100181 inb(WDT_DC); /* Disable watchdog */
182 udelay(8);
183 wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 spin_unlock_irqrestore(&wdtpci_lock, flags);
185 return 0;
186}
187
188/**
189 * wdtpci_ping:
190 *
Alan Cox9f2d1f02008-08-04 17:55:35 +0100191 * Reload counter one with the watchdog heartbeat. We don't bother
192 * reloading the cascade counter.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 */
194
195static int wdtpci_ping(void)
196{
197 unsigned long flags;
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 spin_lock_irqsave(&wdtpci_lock, flags);
Alan Cox9f2d1f02008-08-04 17:55:35 +0100200 /* Write a watchdog value */
201 inb(WDT_DC); /* Disable watchdog */
202 udelay(8);
203 wdtpci_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2:
204 Rate Generator */
205 wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
206 outb(0, WDT_DC); /* Enable watchdog */
207 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 spin_unlock_irqrestore(&wdtpci_lock, flags);
209 return 0;
210}
211
212/**
213 * wdtpci_set_heartbeat:
214 * @t: the new heartbeat value that needs to be set.
215 *
Alan Cox9f2d1f02008-08-04 17:55:35 +0100216 * Set a new heartbeat value for the watchdog device. If the heartbeat
217 * value is incorrect we keep the old value and return -EINVAL.
218 * If successful we return 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 */
220static int wdtpci_set_heartbeat(int t)
221{
222 /* Arbitrary, can't find the card's limits */
Alan Cox9f2d1f02008-08-04 17:55:35 +0100223 if (t < 1 || t > 65535)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 return -EINVAL;
225
226 heartbeat = t;
227 wd_heartbeat = t * 100;
228 return 0;
229}
230
231/**
232 * wdtpci_get_status:
233 * @status: the new status.
234 *
235 * Extract the status information from a WDT watchdog device. There are
236 * several board variants so we have to know which bits are valid. Some
237 * bits default to one and some to zero in order to be maximally painful.
238 *
239 * we then map the bits onto the status ioctl flags.
240 */
241
242static int wdtpci_get_status(int *status)
243{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100244 unsigned char new_status;
245 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
Alan Cox9f2d1f02008-08-04 17:55:35 +0100247 spin_lock_irqsave(&wdtpci_lock, flags);
248 new_status = inb(WDT_SR);
249 spin_unlock_irqrestore(&wdtpci_lock, flags);
250
251 *status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 if (new_status & WDC_SR_ISOI0)
253 *status |= WDIOF_EXTERN1;
254 if (new_status & WDC_SR_ISII1)
255 *status |= WDIOF_EXTERN2;
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000256 if (type == 501) {
257 if (!(new_status & WDC_SR_TGOOD))
258 *status |= WDIOF_OVERHEAT;
259 if (!(new_status & WDC_SR_PSUOVER))
260 *status |= WDIOF_POWEROVER;
261 if (!(new_status & WDC_SR_PSUUNDR))
262 *status |= WDIOF_POWERUNDER;
263 if (tachometer) {
264 if (!(new_status & WDC_SR_FANGOOD))
265 *status |= WDIOF_FANFAULT;
266 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 return 0;
269}
270
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271/**
272 * wdtpci_get_temperature:
273 *
274 * Reports the temperature in degrees Fahrenheit. The API is in
275 * farenheit. It was designed by an imperial measurement luddite.
276 */
277
278static int wdtpci_get_temperature(int *temperature)
279{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100280 unsigned short c;
281 unsigned long flags;
282 spin_lock_irqsave(&wdtpci_lock, flags);
283 c = inb(WDT_RT);
284 udelay(8);
285 spin_unlock_irqrestore(&wdtpci_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 *temperature = (c * 11 / 15) + 7;
287 return 0;
288}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290/**
291 * wdtpci_interrupt:
292 * @irq: Interrupt number
293 * @dev_id: Unused as we don't allow multiple devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 *
295 * Handle an interrupt from the board. These are raised when the status
296 * map changes in what the board considers an interesting way. That means
297 * a failure condition occurring.
298 */
299
David Howells7d12e782006-10-05 14:55:46 +0100300static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
302 /*
303 * Read the status register see what is up and
304 * then printk it.
305 */
Alan Cox9f2d1f02008-08-04 17:55:35 +0100306 unsigned char status;
307
308 spin_lock(&wdtpci_lock);
309
310 status = inb(WDT_SR);
311 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Joe Perches27c766a2012-02-15 15:06:19 -0800313 pr_crit("status %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000315 if (type == 501) {
316 if (!(status & WDC_SR_TGOOD)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800317 pr_crit("Overheat alarm (%d)\n", inb(WDT_RT));
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000318 udelay(8);
319 }
320 if (!(status & WDC_SR_PSUOVER))
Joe Perches27c766a2012-02-15 15:06:19 -0800321 pr_crit("PSU over voltage\n");
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000322 if (!(status & WDC_SR_PSUUNDR))
Joe Perches27c766a2012-02-15 15:06:19 -0800323 pr_crit("PSU under voltage\n");
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000324 if (tachometer) {
325 if (!(status & WDC_SR_FANGOOD))
Joe Perches27c766a2012-02-15 15:06:19 -0800326 pr_crit("Possible fan fault\n");
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000327 }
Alan Cox9f2d1f02008-08-04 17:55:35 +0100328 }
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000329 if (!(status & WDC_SR_WCCR)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330#ifdef SOFTWARE_REBOOT
331#ifdef ONLY_TESTING
Joe Perches27c766a2012-02-15 15:06:19 -0800332 pr_crit("Would Reboot\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333#else
Joe Perches27c766a2012-02-15 15:06:19 -0800334 pr_crit("Initiating system reboot\n");
Eric W. Biedermanf82567e2005-07-26 11:53:19 -0600335 emergency_restart(NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336#endif
337#else
Joe Perches27c766a2012-02-15 15:06:19 -0800338 pr_crit("Reset in 5ms\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339#endif
Ilpo Jarvinen59338d42007-10-23 13:40:54 -0700340 }
Alan Cox9f2d1f02008-08-04 17:55:35 +0100341 spin_unlock(&wdtpci_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 return IRQ_HANDLED;
343}
344
345
346/**
347 * wdtpci_write:
348 * @file: file handle to the watchdog
349 * @buf: buffer to write (unused as data does not matter here
350 * @count: count of bytes
351 * @ppos: pointer to the position to write. No seeks allowed
352 *
353 * A write to a watchdog device is defined as a keepalive signal. Any
354 * write of data will do, as we we don't define content meaning.
355 */
356
Alan Cox9f2d1f02008-08-04 17:55:35 +0100357static ssize_t wdtpci_write(struct file *file, const char __user *buf,
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000358 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
360 if (count) {
361 if (!nowayout) {
362 size_t i;
363
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000364 /* In case it was set long ago */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 expect_close = 0;
366
367 for (i = 0; i != count; i++) {
368 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000369 if (get_user(c, buf + i))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 return -EFAULT;
371 if (c == 'V')
372 expect_close = 42;
373 }
374 }
375 wdtpci_ping();
376 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 return count;
378}
379
380/**
381 * wdtpci_ioctl:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 * @file: file handle to the device
383 * @cmd: watchdog command
384 * @arg: argument pointer
385 *
386 * The watchdog API defines a common set of functions for all watchdogs
387 * according to their available features. We only actually usefully support
388 * querying capabilities and current status.
389 */
390
Alan Cox9f2d1f02008-08-04 17:55:35 +0100391static long wdtpci_ioctl(struct file *file, unsigned int cmd,
392 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 void __user *argp = (void __user *)arg;
395 int __user *p = argp;
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000396 int new_heartbeat;
397 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
Andrew Mortonc1bf3ac2010-03-03 11:57:40 -0800399 struct watchdog_info ident = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 .options = WDIOF_SETTIMEOUT|
401 WDIOF_MAGICCLOSE|
402 WDIOF_KEEPALIVEPING,
403 .firmware_version = 1,
404 .identity = "PCI-WDT500/501",
405 };
406
407 /* Add options according to the card we have */
408 ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000409 if (type == 501) {
410 ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
411 WDIOF_POWEROVER);
412 if (tachometer)
413 ident.options |= WDIOF_FANFAULT;
414 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Alan Cox9f2d1f02008-08-04 17:55:35 +0100416 switch (cmd) {
Alan Cox9f2d1f02008-08-04 17:55:35 +0100417 case WDIOC_GETSUPPORT:
418 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
419 case WDIOC_GETSTATUS:
420 wdtpci_get_status(&status);
421 return put_user(status, p);
422 case WDIOC_GETBOOTSTATUS:
423 return put_user(0, p);
424 case WDIOC_KEEPALIVE:
425 wdtpci_ping();
426 return 0;
427 case WDIOC_SETTIMEOUT:
428 if (get_user(new_heartbeat, p))
429 return -EFAULT;
430 if (wdtpci_set_heartbeat(new_heartbeat))
431 return -EINVAL;
432 wdtpci_ping();
433 /* Fall */
434 case WDIOC_GETTIMEOUT:
435 return put_user(heartbeat, p);
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000436 default:
437 return -ENOTTY;
438 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439}
440
441/**
442 * wdtpci_open:
443 * @inode: inode of device
444 * @file: file handle to device
445 *
446 * The watchdog device has been opened. The watchdog device is single
447 * open and on opening we load the counters. Counter zero is a 100Hz
448 * cascade, into counter 1 which downcounts to reboot. When the counter
449 * triggers counter 2 downcounts the length of the reset pulse which
450 * set set to be as long as possible.
451 */
452
453static int wdtpci_open(struct inode *inode, struct file *file)
454{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100455 if (test_and_set_bit(0, &open_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 return -EBUSY;
457
Alan Cox9f2d1f02008-08-04 17:55:35 +0100458 if (nowayout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 __module_get(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 /*
461 * Activate
462 */
463 wdtpci_start();
464 return nonseekable_open(inode, file);
465}
466
467/**
468 * wdtpci_release:
469 * @inode: inode to board
470 * @file: file handle to board
471 *
472 * The watchdog has a configurable API. There is a religious dispute
473 * between people who want their watchdog to be able to shut down and
474 * those who want to be sure if the watchdog manager dies the machine
475 * reboots. In the former case we disable the counters, in the latter
476 * case you have to open it again very soon.
477 */
478
479static int wdtpci_release(struct inode *inode, struct file *file)
480{
481 if (expect_close == 42) {
482 wdtpci_stop();
483 } else {
Joe Perches27c766a2012-02-15 15:06:19 -0800484 pr_crit("Unexpected close, not stopping timer!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 wdtpci_ping();
486 }
487 expect_close = 0;
Alan Cox9f2d1f02008-08-04 17:55:35 +0100488 clear_bit(0, &open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 return 0;
490}
491
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492/**
493 * wdtpci_temp_read:
494 * @file: file handle to the watchdog board
495 * @buf: buffer to write 1 byte into
496 * @count: length of buffer
497 * @ptr: offset (no seek allowed)
498 *
499 * Read reports the temperature in degrees Fahrenheit. The API is in
500 * fahrenheit. It was designed by an imperial measurement luddite.
501 */
502
Alan Cox9f2d1f02008-08-04 17:55:35 +0100503static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
504 size_t count, loff_t *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505{
506 int temperature;
507
508 if (wdtpci_get_temperature(&temperature))
509 return -EFAULT;
510
Alan Cox9f2d1f02008-08-04 17:55:35 +0100511 if (copy_to_user(buf, &temperature, 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 return -EFAULT;
513
514 return 1;
515}
516
517/**
518 * wdtpci_temp_open:
519 * @inode: inode of device
520 * @file: file handle to device
521 *
522 * The temperature device has been opened.
523 */
524
525static int wdtpci_temp_open(struct inode *inode, struct file *file)
526{
527 return nonseekable_open(inode, file);
528}
529
530/**
531 * wdtpci_temp_release:
532 * @inode: inode to board
533 * @file: file handle to board
534 *
535 * The temperature device has been closed.
536 */
537
538static int wdtpci_temp_release(struct inode *inode, struct file *file)
539{
540 return 0;
541}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543/**
544 * notify_sys:
545 * @this: our notifier block
546 * @code: the event being reported
547 * @unused: unused
548 *
549 * Our notifier is called on system shutdowns. We want to turn the card
550 * off at reboot otherwise the machine will reboot again during memory
551 * test or worse yet during the following fsck. This would suck, in fact
552 * trust me - if it happens it does suck.
553 */
554
555static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
Alan Cox9f2d1f02008-08-04 17:55:35 +0100556 void *unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100558 if (code == SYS_DOWN || code == SYS_HALT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 wdtpci_stop();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 return NOTIFY_DONE;
561}
562
563/*
564 * Kernel Interfaces
565 */
566
567
Arjan van de Ven62322d22006-07-03 00:24:21 -0700568static const struct file_operations wdtpci_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 .owner = THIS_MODULE,
570 .llseek = no_llseek,
571 .write = wdtpci_write,
Alan Cox9f2d1f02008-08-04 17:55:35 +0100572 .unlocked_ioctl = wdtpci_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 .open = wdtpci_open,
574 .release = wdtpci_release,
575};
576
577static struct miscdevice wdtpci_miscdev = {
578 .minor = WATCHDOG_MINOR,
579 .name = "watchdog",
580 .fops = &wdtpci_fops,
581};
582
Arjan van de Ven62322d22006-07-03 00:24:21 -0700583static const struct file_operations wdtpci_temp_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584 .owner = THIS_MODULE,
585 .llseek = no_llseek,
586 .read = wdtpci_temp_read,
587 .open = wdtpci_temp_open,
588 .release = wdtpci_temp_release,
589};
590
591static struct miscdevice temp_miscdev = {
592 .minor = TEMP_MINOR,
593 .name = "temperature",
594 .fops = &wdtpci_temp_fops,
595};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
597/*
598 * The WDT card needs to learn about soft shutdowns in order to
599 * turn the timebomb registers off.
600 */
601
602static struct notifier_block wdtpci_notifier = {
603 .notifier_call = wdtpci_notify_sys,
604};
605
606
Bill Pemberton2d991a12012-11-19 13:21:41 -0500607static int wdtpci_init_one(struct pci_dev *dev,
Alan Cox9f2d1f02008-08-04 17:55:35 +0100608 const struct pci_device_id *ent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609{
610 int ret = -EIO;
611
612 dev_count++;
613 if (dev_count > 1) {
Joe Perches27c766a2012-02-15 15:06:19 -0800614 pr_err("This driver only supports one device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615 return -ENODEV;
616 }
617
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000618 if (type != 500 && type != 501) {
Joe Perches27c766a2012-02-15 15:06:19 -0800619 pr_err("unknown card type '%d'\n", type);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000620 return -ENODEV;
621 }
622
Alan Cox9f2d1f02008-08-04 17:55:35 +0100623 if (pci_enable_device(dev)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800624 pr_err("Not possible to enable PCI Device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 return -ENODEV;
626 }
627
Alan Cox9f2d1f02008-08-04 17:55:35 +0100628 if (pci_resource_start(dev, 2) == 0x0000) {
Joe Perches27c766a2012-02-15 15:06:19 -0800629 pr_err("No I/O-Address for card detected\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 ret = -ENODEV;
631 goto out_pci;
632 }
633
Wim Van Sebroeck119d3e52009-08-06 18:57:49 +0000634 if (pci_request_region(dev, 2, "wdt_pci")) {
Joe Perches27c766a2012-02-15 15:06:19 -0800635 pr_err("I/O address 0x%llx already in use\n",
636 (unsigned long long)pci_resource_start(dev, 2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 goto out_pci;
638 }
639
Wim Van Sebroeck119d3e52009-08-06 18:57:49 +0000640 irq = dev->irq;
641 io = pci_resource_start(dev, 2);
642
Yong Zhang86b59122011-09-07 16:10:55 +0800643 if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 "wdt_pci", &wdtpci_miscdev)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800645 pr_err("IRQ %d is not free\n", irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 goto out_reg;
647 }
648
Joe Perches27c766a2012-02-15 15:06:19 -0800649 pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
650 (unsigned long long)io, irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Alan Cox9f2d1f02008-08-04 17:55:35 +0100652 /* Check that the heartbeat value is within its range;
653 if not reset to the default */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 if (wdtpci_set_heartbeat(heartbeat)) {
655 wdtpci_set_heartbeat(WD_TIMO);
Joe Perches27c766a2012-02-15 15:06:19 -0800656 pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
657 WD_TIMO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 }
659
Alan Cox9f2d1f02008-08-04 17:55:35 +0100660 ret = register_reboot_notifier(&wdtpci_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 if (ret) {
Joe Perches27c766a2012-02-15 15:06:19 -0800662 pr_err("cannot register reboot notifier (err=%d)\n", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 goto out_irq;
664 }
665
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000666 if (type == 501) {
667 ret = misc_register(&temp_miscdev);
668 if (ret) {
Joe Perches27c766a2012-02-15 15:06:19 -0800669 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
670 TEMP_MINOR, ret);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000671 goto out_rbt;
672 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674
Alan Cox9f2d1f02008-08-04 17:55:35 +0100675 ret = misc_register(&wdtpci_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 if (ret) {
Joe Perches27c766a2012-02-15 15:06:19 -0800677 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
678 WATCHDOG_MINOR, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 goto out_misc;
680 }
681
Joe Perches27c766a2012-02-15 15:06:19 -0800682 pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 heartbeat, nowayout);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000684 if (type == 501)
Joe Perches27c766a2012-02-15 15:06:19 -0800685 pr_info("Fan Tachometer is %s\n",
686 tachometer ? "Enabled" : "Disabled");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687
688 ret = 0;
689out:
690 return ret;
691
692out_misc:
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000693 if (type == 501)
694 misc_deregister(&temp_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695out_rbt:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 unregister_reboot_notifier(&wdtpci_notifier);
697out_irq:
698 free_irq(irq, &wdtpci_miscdev);
699out_reg:
Wim Van Sebroeck119d3e52009-08-06 18:57:49 +0000700 pci_release_region(dev, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701out_pci:
702 pci_disable_device(dev);
703 goto out;
704}
705
706
Bill Pemberton4b12b892012-11-19 13:26:24 -0500707static void wdtpci_remove_one(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708{
709 /* here we assume only one device will ever have
710 * been picked up and registered by probe function */
711 misc_deregister(&wdtpci_miscdev);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000712 if (type == 501)
713 misc_deregister(&temp_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 unregister_reboot_notifier(&wdtpci_notifier);
715 free_irq(irq, &wdtpci_miscdev);
Wim Van Sebroeck119d3e52009-08-06 18:57:49 +0000716 pci_release_region(pdev, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 pci_disable_device(pdev);
718 dev_count--;
719}
720
721
Jingoo Hanbc17f9d2013-12-03 08:30:22 +0900722static const struct pci_device_id wdtpci_pci_tbl[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723 {
724 .vendor = PCI_VENDOR_ID_ACCESSIO,
H Hartley Sweeten9f2cc6f2010-05-21 18:38:52 -0500725 .device = PCI_DEVICE_ID_ACCESSIO_WDG_CSM,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 .subvendor = PCI_ANY_ID,
727 .subdevice = PCI_ANY_ID,
728 },
729 { 0, }, /* terminate list */
730};
731MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
732
733
734static struct pci_driver wdtpci_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 .name = "wdt_pci",
736 .id_table = wdtpci_pci_tbl,
737 .probe = wdtpci_init_one,
Bill Pemberton82268712012-11-19 13:21:12 -0500738 .remove = wdtpci_remove_one,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739};
740
Wim Van Sebroeck5ce9c372012-05-04 14:43:25 +0200741module_pci_driver(wdtpci_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742
743MODULE_AUTHOR("JP Nollmann, Alan Cox");
744MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
745MODULE_LICENSE("GPL");