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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>
52#include <linux/init.h>
53#include <linux/fs.h>
54#include <linux/pci.h>
Alan Cox9f2d1f02008-08-04 17:55:35 +010055#include <linux/io.h>
56#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59#define WDT_IS_PCI
60#include "wd501p.h"
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062/* We can only use 1 card due to the /dev/watchdog restriction */
63static int dev_count;
64
Alan Cox9f2d1f02008-08-04 17:55:35 +010065static unsigned long open_lock;
Alexey Dobriyanc7dfd0c2007-11-01 16:27:08 -070066static DEFINE_SPINLOCK(wdtpci_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067static char expect_close;
68
Randy Dunlapd1833c22009-08-07 15:02:00 -070069static resource_size_t io;
Linus Torvalds1da177e2005-04-16 15:20:36 -070070static int irq;
71
72/* Default timeout */
73#define WD_TIMO 60 /* Default heartbeat = 60 seconds */
74
75static int heartbeat = WD_TIMO;
76static int wd_heartbeat;
77module_param(heartbeat, int, 0);
Alan Cox9f2d1f02008-08-04 17:55:35 +010078MODULE_PARM_DESC(heartbeat,
79 "Watchdog heartbeat in seconds. (0<heartbeat<65536, default="
80 __MODULE_STRING(WD_TIMO) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -070081
Wim Van Sebroeck86a1e182012-03-05 16:51:11 +010082static bool nowayout = WATCHDOG_NOWAYOUT;
83module_param(nowayout, bool, 0);
Alan Cox9f2d1f02008-08-04 17:55:35 +010084MODULE_PARM_DESC(nowayout,
85 "Watchdog cannot be stopped once started (default="
86 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
Linus Torvalds1da177e2005-04-16 15:20:36 -070088/* Support for the Fan Tachometer on the PCI-WDT501 */
89static int tachometer;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090module_param(tachometer, int, 0);
Alan Cox9f2d1f02008-08-04 17:55:35 +010091MODULE_PARM_DESC(tachometer,
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +000092 "PCI-WDT501 Fan Tachometer support (0=disable, default=0)");
93
94static int type = 500;
95module_param(type, int, 0);
96MODULE_PARM_DESC(type,
97 "PCI-WDT501 Card type (500 or 501 , default=500)");
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
99/*
100 * Programming support
101 */
102
103static void wdtpci_ctr_mode(int ctr, int mode)
104{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100105 ctr <<= 6;
106 ctr |= 0x30;
107 ctr |= (mode << 1);
108 outb(ctr, WDT_CR);
109 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111
112static void wdtpci_ctr_load(int ctr, int val)
113{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100114 outb(val & 0xFF, WDT_COUNT0 + ctr);
115 udelay(8);
116 outb(val >> 8, WDT_COUNT0 + ctr);
117 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118}
119
120/**
121 * wdtpci_start:
122 *
123 * Start the watchdog driver.
124 */
125
126static int wdtpci_start(void)
127{
128 unsigned long flags;
129
130 spin_lock_irqsave(&wdtpci_lock, flags);
131
132 /*
133 * "pet" the watchdog, as Access says.
134 * This resets the clock outputs.
135 */
Alan Cox9f2d1f02008-08-04 17:55:35 +0100136 inb(WDT_DC); /* Disable watchdog */
137 udelay(8);
138 wdtpci_ctr_mode(2, 0); /* Program CTR2 for Mode 0:
139 Pulse on Terminal Count */
140 outb(0, WDT_DC); /* Enable watchdog */
141 udelay(8);
142 inb(WDT_DC); /* Disable watchdog */
143 udelay(8);
144 outb(0, WDT_CLOCK); /* 2.0833MHz clock */
145 udelay(8);
146 inb(WDT_BUZZER); /* disable */
147 udelay(8);
148 inb(WDT_OPTONOTRST); /* disable */
149 udelay(8);
150 inb(WDT_OPTORST); /* disable */
151 udelay(8);
152 inb(WDT_PROGOUT); /* disable */
153 udelay(8);
154 wdtpci_ctr_mode(0, 3); /* Program CTR0 for Mode 3:
155 Square Wave Generator */
156 wdtpci_ctr_mode(1, 2); /* Program CTR1 for Mode 2:
157 Rate Generator */
158 wdtpci_ctr_mode(2, 1); /* Program CTR2 for Mode 1:
159 Retriggerable One-Shot */
160 wdtpci_ctr_load(0, 20833); /* count at 100Hz */
161 wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 /* DO NOT LOAD CTR2 on PCI card! -- JPN */
Alan Cox9f2d1f02008-08-04 17:55:35 +0100163 outb(0, WDT_DC); /* Enable watchdog */
164 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166 spin_unlock_irqrestore(&wdtpci_lock, flags);
167 return 0;
168}
169
170/**
171 * wdtpci_stop:
172 *
173 * Stop the watchdog driver.
174 */
175
Alan Cox9f2d1f02008-08-04 17:55:35 +0100176static int wdtpci_stop(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
178 unsigned long flags;
179
180 /* Turn the card off */
181 spin_lock_irqsave(&wdtpci_lock, flags);
Alan Cox9f2d1f02008-08-04 17:55:35 +0100182 inb(WDT_DC); /* Disable watchdog */
183 udelay(8);
184 wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 spin_unlock_irqrestore(&wdtpci_lock, flags);
186 return 0;
187}
188
189/**
190 * wdtpci_ping:
191 *
Alan Cox9f2d1f02008-08-04 17:55:35 +0100192 * Reload counter one with the watchdog heartbeat. We don't bother
193 * reloading the cascade counter.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 */
195
196static int wdtpci_ping(void)
197{
198 unsigned long flags;
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 spin_lock_irqsave(&wdtpci_lock, flags);
Alan Cox9f2d1f02008-08-04 17:55:35 +0100201 /* Write a watchdog value */
202 inb(WDT_DC); /* Disable watchdog */
203 udelay(8);
204 wdtpci_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2:
205 Rate Generator */
206 wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */
207 outb(0, WDT_DC); /* Enable watchdog */
208 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 spin_unlock_irqrestore(&wdtpci_lock, flags);
210 return 0;
211}
212
213/**
214 * wdtpci_set_heartbeat:
215 * @t: the new heartbeat value that needs to be set.
216 *
Alan Cox9f2d1f02008-08-04 17:55:35 +0100217 * Set a new heartbeat value for the watchdog device. If the heartbeat
218 * value is incorrect we keep the old value and return -EINVAL.
219 * If successful we return 0.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 */
221static int wdtpci_set_heartbeat(int t)
222{
223 /* Arbitrary, can't find the card's limits */
Alan Cox9f2d1f02008-08-04 17:55:35 +0100224 if (t < 1 || t > 65535)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 return -EINVAL;
226
227 heartbeat = t;
228 wd_heartbeat = t * 100;
229 return 0;
230}
231
232/**
233 * wdtpci_get_status:
234 * @status: the new status.
235 *
236 * Extract the status information from a WDT watchdog device. There are
237 * several board variants so we have to know which bits are valid. Some
238 * bits default to one and some to zero in order to be maximally painful.
239 *
240 * we then map the bits onto the status ioctl flags.
241 */
242
243static int wdtpci_get_status(int *status)
244{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100245 unsigned char new_status;
246 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
Alan Cox9f2d1f02008-08-04 17:55:35 +0100248 spin_lock_irqsave(&wdtpci_lock, flags);
249 new_status = inb(WDT_SR);
250 spin_unlock_irqrestore(&wdtpci_lock, flags);
251
252 *status = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 if (new_status & WDC_SR_ISOI0)
254 *status |= WDIOF_EXTERN1;
255 if (new_status & WDC_SR_ISII1)
256 *status |= WDIOF_EXTERN2;
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000257 if (type == 501) {
258 if (!(new_status & WDC_SR_TGOOD))
259 *status |= WDIOF_OVERHEAT;
260 if (!(new_status & WDC_SR_PSUOVER))
261 *status |= WDIOF_POWEROVER;
262 if (!(new_status & WDC_SR_PSUUNDR))
263 *status |= WDIOF_POWERUNDER;
264 if (tachometer) {
265 if (!(new_status & WDC_SR_FANGOOD))
266 *status |= WDIOF_FANFAULT;
267 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return 0;
270}
271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272/**
273 * wdtpci_get_temperature:
274 *
275 * Reports the temperature in degrees Fahrenheit. The API is in
276 * farenheit. It was designed by an imperial measurement luddite.
277 */
278
279static int wdtpci_get_temperature(int *temperature)
280{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100281 unsigned short c;
282 unsigned long flags;
283 spin_lock_irqsave(&wdtpci_lock, flags);
284 c = inb(WDT_RT);
285 udelay(8);
286 spin_unlock_irqrestore(&wdtpci_lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 *temperature = (c * 11 / 15) + 7;
288 return 0;
289}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
291/**
292 * wdtpci_interrupt:
293 * @irq: Interrupt number
294 * @dev_id: Unused as we don't allow multiple devices.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 *
296 * Handle an interrupt from the board. These are raised when the status
297 * map changes in what the board considers an interesting way. That means
298 * a failure condition occurring.
299 */
300
David Howells7d12e782006-10-05 14:55:46 +0100301static irqreturn_t wdtpci_interrupt(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
303 /*
304 * Read the status register see what is up and
305 * then printk it.
306 */
Alan Cox9f2d1f02008-08-04 17:55:35 +0100307 unsigned char status;
308
309 spin_lock(&wdtpci_lock);
310
311 status = inb(WDT_SR);
312 udelay(8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313
Joe Perches27c766a2012-02-15 15:06:19 -0800314 pr_crit("status %d\n", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000316 if (type == 501) {
317 if (!(status & WDC_SR_TGOOD)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800318 pr_crit("Overheat alarm (%d)\n", inb(WDT_RT));
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000319 udelay(8);
320 }
321 if (!(status & WDC_SR_PSUOVER))
Joe Perches27c766a2012-02-15 15:06:19 -0800322 pr_crit("PSU over voltage\n");
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000323 if (!(status & WDC_SR_PSUUNDR))
Joe Perches27c766a2012-02-15 15:06:19 -0800324 pr_crit("PSU under voltage\n");
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000325 if (tachometer) {
326 if (!(status & WDC_SR_FANGOOD))
Joe Perches27c766a2012-02-15 15:06:19 -0800327 pr_crit("Possible fan fault\n");
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000328 }
Alan Cox9f2d1f02008-08-04 17:55:35 +0100329 }
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000330 if (!(status & WDC_SR_WCCR)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331#ifdef SOFTWARE_REBOOT
332#ifdef ONLY_TESTING
Joe Perches27c766a2012-02-15 15:06:19 -0800333 pr_crit("Would Reboot\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334#else
Joe Perches27c766a2012-02-15 15:06:19 -0800335 pr_crit("Initiating system reboot\n");
Eric W. Biedermanf82567e2005-07-26 11:53:19 -0600336 emergency_restart(NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337#endif
338#else
Joe Perches27c766a2012-02-15 15:06:19 -0800339 pr_crit("Reset in 5ms\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340#endif
Ilpo Jarvinen59338d42007-10-23 13:40:54 -0700341 }
Alan Cox9f2d1f02008-08-04 17:55:35 +0100342 spin_unlock(&wdtpci_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 return IRQ_HANDLED;
344}
345
346
347/**
348 * wdtpci_write:
349 * @file: file handle to the watchdog
350 * @buf: buffer to write (unused as data does not matter here
351 * @count: count of bytes
352 * @ppos: pointer to the position to write. No seeks allowed
353 *
354 * A write to a watchdog device is defined as a keepalive signal. Any
355 * write of data will do, as we we don't define content meaning.
356 */
357
Alan Cox9f2d1f02008-08-04 17:55:35 +0100358static ssize_t wdtpci_write(struct file *file, const char __user *buf,
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000359 size_t count, loff_t *ppos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
361 if (count) {
362 if (!nowayout) {
363 size_t i;
364
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000365 /* In case it was set long ago */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 expect_close = 0;
367
368 for (i = 0; i != count; i++) {
369 char c;
Wim Van Sebroeck7944d3a2008-08-06 20:19:41 +0000370 if (get_user(c, buf + i))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 return -EFAULT;
372 if (c == 'V')
373 expect_close = 42;
374 }
375 }
376 wdtpci_ping();
377 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 return count;
379}
380
381/**
382 * wdtpci_ioctl:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 * @file: file handle to the device
384 * @cmd: watchdog command
385 * @arg: argument pointer
386 *
387 * The watchdog API defines a common set of functions for all watchdogs
388 * according to their available features. We only actually usefully support
389 * querying capabilities and current status.
390 */
391
Alan Cox9f2d1f02008-08-04 17:55:35 +0100392static long wdtpci_ioctl(struct file *file, unsigned int cmd,
393 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 void __user *argp = (void __user *)arg;
396 int __user *p = argp;
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000397 int new_heartbeat;
398 int status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Andrew Mortonc1bf3ac2010-03-03 11:57:40 -0800400 struct watchdog_info ident = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 .options = WDIOF_SETTIMEOUT|
402 WDIOF_MAGICCLOSE|
403 WDIOF_KEEPALIVEPING,
404 .firmware_version = 1,
405 .identity = "PCI-WDT500/501",
406 };
407
408 /* Add options according to the card we have */
409 ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000410 if (type == 501) {
411 ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
412 WDIOF_POWEROVER);
413 if (tachometer)
414 ident.options |= WDIOF_FANFAULT;
415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Alan Cox9f2d1f02008-08-04 17:55:35 +0100417 switch (cmd) {
Alan Cox9f2d1f02008-08-04 17:55:35 +0100418 case WDIOC_GETSUPPORT:
419 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
420 case WDIOC_GETSTATUS:
421 wdtpci_get_status(&status);
422 return put_user(status, p);
423 case WDIOC_GETBOOTSTATUS:
424 return put_user(0, p);
425 case WDIOC_KEEPALIVE:
426 wdtpci_ping();
427 return 0;
428 case WDIOC_SETTIMEOUT:
429 if (get_user(new_heartbeat, p))
430 return -EFAULT;
431 if (wdtpci_set_heartbeat(new_heartbeat))
432 return -EINVAL;
433 wdtpci_ping();
434 /* Fall */
435 case WDIOC_GETTIMEOUT:
436 return put_user(heartbeat, p);
Wim Van Sebroeck0c060902008-07-18 11:41:17 +0000437 default:
438 return -ENOTTY;
439 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
442/**
443 * wdtpci_open:
444 * @inode: inode of device
445 * @file: file handle to device
446 *
447 * The watchdog device has been opened. The watchdog device is single
448 * open and on opening we load the counters. Counter zero is a 100Hz
449 * cascade, into counter 1 which downcounts to reboot. When the counter
450 * triggers counter 2 downcounts the length of the reset pulse which
451 * set set to be as long as possible.
452 */
453
454static int wdtpci_open(struct inode *inode, struct file *file)
455{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100456 if (test_and_set_bit(0, &open_lock))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 return -EBUSY;
458
Alan Cox9f2d1f02008-08-04 17:55:35 +0100459 if (nowayout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 __module_get(THIS_MODULE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 /*
462 * Activate
463 */
464 wdtpci_start();
465 return nonseekable_open(inode, file);
466}
467
468/**
469 * wdtpci_release:
470 * @inode: inode to board
471 * @file: file handle to board
472 *
473 * The watchdog has a configurable API. There is a religious dispute
474 * between people who want their watchdog to be able to shut down and
475 * those who want to be sure if the watchdog manager dies the machine
476 * reboots. In the former case we disable the counters, in the latter
477 * case you have to open it again very soon.
478 */
479
480static int wdtpci_release(struct inode *inode, struct file *file)
481{
482 if (expect_close == 42) {
483 wdtpci_stop();
484 } else {
Joe Perches27c766a2012-02-15 15:06:19 -0800485 pr_crit("Unexpected close, not stopping timer!\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 wdtpci_ping();
487 }
488 expect_close = 0;
Alan Cox9f2d1f02008-08-04 17:55:35 +0100489 clear_bit(0, &open_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 return 0;
491}
492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493/**
494 * wdtpci_temp_read:
495 * @file: file handle to the watchdog board
496 * @buf: buffer to write 1 byte into
497 * @count: length of buffer
498 * @ptr: offset (no seek allowed)
499 *
500 * Read reports the temperature in degrees Fahrenheit. The API is in
501 * fahrenheit. It was designed by an imperial measurement luddite.
502 */
503
Alan Cox9f2d1f02008-08-04 17:55:35 +0100504static ssize_t wdtpci_temp_read(struct file *file, char __user *buf,
505 size_t count, loff_t *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506{
507 int temperature;
508
509 if (wdtpci_get_temperature(&temperature))
510 return -EFAULT;
511
Alan Cox9f2d1f02008-08-04 17:55:35 +0100512 if (copy_to_user(buf, &temperature, 1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 return -EFAULT;
514
515 return 1;
516}
517
518/**
519 * wdtpci_temp_open:
520 * @inode: inode of device
521 * @file: file handle to device
522 *
523 * The temperature device has been opened.
524 */
525
526static int wdtpci_temp_open(struct inode *inode, struct file *file)
527{
528 return nonseekable_open(inode, file);
529}
530
531/**
532 * wdtpci_temp_release:
533 * @inode: inode to board
534 * @file: file handle to board
535 *
536 * The temperature device has been closed.
537 */
538
539static int wdtpci_temp_release(struct inode *inode, struct file *file)
540{
541 return 0;
542}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544/**
545 * notify_sys:
546 * @this: our notifier block
547 * @code: the event being reported
548 * @unused: unused
549 *
550 * Our notifier is called on system shutdowns. We want to turn the card
551 * off at reboot otherwise the machine will reboot again during memory
552 * test or worse yet during the following fsck. This would suck, in fact
553 * trust me - if it happens it does suck.
554 */
555
556static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code,
Alan Cox9f2d1f02008-08-04 17:55:35 +0100557 void *unused)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100559 if (code == SYS_DOWN || code == SYS_HALT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 wdtpci_stop();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 return NOTIFY_DONE;
562}
563
564/*
565 * Kernel Interfaces
566 */
567
568
Arjan van de Ven62322d22006-07-03 00:24:21 -0700569static const struct file_operations wdtpci_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 .owner = THIS_MODULE,
571 .llseek = no_llseek,
572 .write = wdtpci_write,
Alan Cox9f2d1f02008-08-04 17:55:35 +0100573 .unlocked_ioctl = wdtpci_ioctl,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 .open = wdtpci_open,
575 .release = wdtpci_release,
576};
577
578static struct miscdevice wdtpci_miscdev = {
579 .minor = WATCHDOG_MINOR,
580 .name = "watchdog",
581 .fops = &wdtpci_fops,
582};
583
Arjan van de Ven62322d22006-07-03 00:24:21 -0700584static const struct file_operations wdtpci_temp_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 .owner = THIS_MODULE,
586 .llseek = no_llseek,
587 .read = wdtpci_temp_read,
588 .open = wdtpci_temp_open,
589 .release = wdtpci_temp_release,
590};
591
592static struct miscdevice temp_miscdev = {
593 .minor = TEMP_MINOR,
594 .name = "temperature",
595 .fops = &wdtpci_temp_fops,
596};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
598/*
599 * The WDT card needs to learn about soft shutdowns in order to
600 * turn the timebomb registers off.
601 */
602
603static struct notifier_block wdtpci_notifier = {
604 .notifier_call = wdtpci_notify_sys,
605};
606
607
Alan Cox9f2d1f02008-08-04 17:55:35 +0100608static int __devinit wdtpci_init_one(struct pci_dev *dev,
609 const struct pci_device_id *ent)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610{
611 int ret = -EIO;
612
613 dev_count++;
614 if (dev_count > 1) {
Joe Perches27c766a2012-02-15 15:06:19 -0800615 pr_err("This driver only supports one device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 return -ENODEV;
617 }
618
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000619 if (type != 500 && type != 501) {
Joe Perches27c766a2012-02-15 15:06:19 -0800620 pr_err("unknown card type '%d'\n", type);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000621 return -ENODEV;
622 }
623
Alan Cox9f2d1f02008-08-04 17:55:35 +0100624 if (pci_enable_device(dev)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800625 pr_err("Not possible to enable PCI Device\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 return -ENODEV;
627 }
628
Alan Cox9f2d1f02008-08-04 17:55:35 +0100629 if (pci_resource_start(dev, 2) == 0x0000) {
Joe Perches27c766a2012-02-15 15:06:19 -0800630 pr_err("No I/O-Address for card detected\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 ret = -ENODEV;
632 goto out_pci;
633 }
634
Wim Van Sebroeck119d3e52009-08-06 18:57:49 +0000635 if (pci_request_region(dev, 2, "wdt_pci")) {
Joe Perches27c766a2012-02-15 15:06:19 -0800636 pr_err("I/O address 0x%llx already in use\n",
637 (unsigned long long)pci_resource_start(dev, 2));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 goto out_pci;
639 }
640
Wim Van Sebroeck119d3e52009-08-06 18:57:49 +0000641 irq = dev->irq;
642 io = pci_resource_start(dev, 2);
643
Yong Zhang86b59122011-09-07 16:10:55 +0800644 if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 "wdt_pci", &wdtpci_miscdev)) {
Joe Perches27c766a2012-02-15 15:06:19 -0800646 pr_err("IRQ %d is not free\n", irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 goto out_reg;
648 }
649
Joe Perches27c766a2012-02-15 15:06:19 -0800650 pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n",
651 (unsigned long long)io, irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
Alan Cox9f2d1f02008-08-04 17:55:35 +0100653 /* Check that the heartbeat value is within its range;
654 if not reset to the default */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 if (wdtpci_set_heartbeat(heartbeat)) {
656 wdtpci_set_heartbeat(WD_TIMO);
Joe Perches27c766a2012-02-15 15:06:19 -0800657 pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
658 WD_TIMO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 }
660
Alan Cox9f2d1f02008-08-04 17:55:35 +0100661 ret = register_reboot_notifier(&wdtpci_notifier);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 if (ret) {
Joe Perches27c766a2012-02-15 15:06:19 -0800663 pr_err("cannot register reboot notifier (err=%d)\n", ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 goto out_irq;
665 }
666
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000667 if (type == 501) {
668 ret = misc_register(&temp_miscdev);
669 if (ret) {
Joe Perches27c766a2012-02-15 15:06:19 -0800670 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
671 TEMP_MINOR, ret);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000672 goto out_rbt;
673 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
Alan Cox9f2d1f02008-08-04 17:55:35 +0100676 ret = misc_register(&wdtpci_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 if (ret) {
Joe Perches27c766a2012-02-15 15:06:19 -0800678 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
679 WATCHDOG_MINOR, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 goto out_misc;
681 }
682
Joe Perches27c766a2012-02-15 15:06:19 -0800683 pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 heartbeat, nowayout);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000685 if (type == 501)
Joe Perches27c766a2012-02-15 15:06:19 -0800686 pr_info("Fan Tachometer is %s\n",
687 tachometer ? "Enabled" : "Disabled");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688
689 ret = 0;
690out:
691 return ret;
692
693out_misc:
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000694 if (type == 501)
695 misc_deregister(&temp_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696out_rbt:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 unregister_reboot_notifier(&wdtpci_notifier);
698out_irq:
699 free_irq(irq, &wdtpci_miscdev);
700out_reg:
Wim Van Sebroeck119d3e52009-08-06 18:57:49 +0000701 pci_release_region(dev, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702out_pci:
703 pci_disable_device(dev);
704 goto out;
705}
706
707
Alan Cox9f2d1f02008-08-04 17:55:35 +0100708static void __devexit wdtpci_remove_one(struct pci_dev *pdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709{
710 /* here we assume only one device will ever have
711 * been picked up and registered by probe function */
712 misc_deregister(&wdtpci_miscdev);
Wim Van Sebroeck9b901ee2009-06-19 09:32:57 +0000713 if (type == 501)
714 misc_deregister(&temp_miscdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715 unregister_reboot_notifier(&wdtpci_notifier);
716 free_irq(irq, &wdtpci_miscdev);
Wim Van Sebroeck119d3e52009-08-06 18:57:49 +0000717 pci_release_region(pdev, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 pci_disable_device(pdev);
719 dev_count--;
720}
721
722
Wim Van Sebroeck4562f532011-02-21 12:16:44 +0000723static DEFINE_PCI_DEVICE_TABLE(wdtpci_pci_tbl) = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 {
725 .vendor = PCI_VENDOR_ID_ACCESSIO,
H Hartley Sweeten9f2cc6f2010-05-21 18:38:52 -0500726 .device = PCI_DEVICE_ID_ACCESSIO_WDG_CSM,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727 .subvendor = PCI_ANY_ID,
728 .subdevice = PCI_ANY_ID,
729 },
730 { 0, }, /* terminate list */
731};
732MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl);
733
734
735static struct pci_driver wdtpci_driver = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 .name = "wdt_pci",
737 .id_table = wdtpci_pci_tbl,
738 .probe = wdtpci_init_one,
739 .remove = __devexit_p(wdtpci_remove_one),
740};
741
742
743/**
744 * wdtpci_cleanup:
745 *
746 * Unload the watchdog. You cannot do this with any file handles open.
747 * If your watchdog is set to continue ticking on close and you unload
748 * it, well it keeps ticking. We won't get the interrupt but the board
749 * will not touch PC memory so all is fine. You just have to load a new
750 * module in xx seconds or reboot.
751 */
752
753static void __exit wdtpci_cleanup(void)
754{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100755 pci_unregister_driver(&wdtpci_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756}
757
758
759/**
Wim Van Sebroeck5f3b2752011-02-23 20:04:38 +0000760 * wdtpci_init:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 *
762 * Set up the WDT watchdog board. All we have to do is grab the
763 * resources we require and bitch if anyone beat us to them.
764 * The open() function will actually kick the board off.
765 */
766
767static int __init wdtpci_init(void)
768{
Alan Cox9f2d1f02008-08-04 17:55:35 +0100769 return pci_register_driver(&wdtpci_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770}
771
772
773module_init(wdtpci_init);
774module_exit(wdtpci_cleanup);
775
776MODULE_AUTHOR("JP Nollmann, Alan Cox");
777MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards");
778MODULE_LICENSE("GPL");
779MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
780MODULE_ALIAS_MISCDEV(TEMP_MINOR);