Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Industrial Computer Source PCI-WDT500/501 driver | |
3 | * | |
29fa0586 | 4 | * (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>, |
9b901ee0 | 5 | * All Rights Reserved. |
1da177e4 LT |
6 | * |
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 | |
9f2d1f0d AC |
32 | * Tigran Aivazian : Restructured wdtpci_init_one() to handle |
33 | * failures | |
5f3b2756 | 34 | * Joel Becker : Added WDIOC_GET/SETTIMEOUT |
9f2d1f0d AC |
35 | * Zwane Mwaikambo : Magic char closing, locking changes, |
36 | * cleanups | |
1da177e4 LT |
37 | * Matt Domsch : nowayout module option |
38 | */ | |
39 | ||
27c766aa JP |
40 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
41 | ||
1da177e4 LT |
42 | #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> | |
81830061 | 49 | #include <linux/delay.h> |
1da177e4 LT |
50 | #include <linux/notifier.h> |
51 | #include <linux/reboot.h> | |
52 | #include <linux/init.h> | |
53 | #include <linux/fs.h> | |
54 | #include <linux/pci.h> | |
9f2d1f0d AC |
55 | #include <linux/io.h> |
56 | #include <linux/uaccess.h> | |
1da177e4 | 57 | |
1da177e4 LT |
58 | |
59 | #define WDT_IS_PCI | |
60 | #include "wd501p.h" | |
61 | ||
1da177e4 LT |
62 | /* We can only use 1 card due to the /dev/watchdog restriction */ |
63 | static int dev_count; | |
64 | ||
9f2d1f0d | 65 | static unsigned long open_lock; |
c7dfd0cc | 66 | static DEFINE_SPINLOCK(wdtpci_lock); |
1da177e4 LT |
67 | static char expect_close; |
68 | ||
d1833c21 | 69 | static resource_size_t io; |
1da177e4 LT |
70 | static int irq; |
71 | ||
72 | /* Default timeout */ | |
73 | #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ | |
74 | ||
75 | static int heartbeat = WD_TIMO; | |
76 | static int wd_heartbeat; | |
77 | module_param(heartbeat, int, 0); | |
9f2d1f0d AC |
78 | MODULE_PARM_DESC(heartbeat, |
79 | "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" | |
80 | __MODULE_STRING(WD_TIMO) ")"); | |
1da177e4 | 81 | |
86a1e189 WVS |
82 | static bool nowayout = WATCHDOG_NOWAYOUT; |
83 | module_param(nowayout, bool, 0); | |
9f2d1f0d AC |
84 | MODULE_PARM_DESC(nowayout, |
85 | "Watchdog cannot be stopped once started (default=" | |
86 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
1da177e4 | 87 | |
1da177e4 LT |
88 | /* Support for the Fan Tachometer on the PCI-WDT501 */ |
89 | static int tachometer; | |
1da177e4 | 90 | module_param(tachometer, int, 0); |
9f2d1f0d | 91 | MODULE_PARM_DESC(tachometer, |
9b901ee0 WVS |
92 | "PCI-WDT501 Fan Tachometer support (0=disable, default=0)"); |
93 | ||
94 | static int type = 500; | |
95 | module_param(type, int, 0); | |
96 | MODULE_PARM_DESC(type, | |
97 | "PCI-WDT501 Card type (500 or 501 , default=500)"); | |
1da177e4 LT |
98 | |
99 | /* | |
100 | * Programming support | |
101 | */ | |
102 | ||
103 | static void wdtpci_ctr_mode(int ctr, int mode) | |
104 | { | |
9f2d1f0d AC |
105 | ctr <<= 6; |
106 | ctr |= 0x30; | |
107 | ctr |= (mode << 1); | |
108 | outb(ctr, WDT_CR); | |
109 | udelay(8); | |
1da177e4 LT |
110 | } |
111 | ||
112 | static void wdtpci_ctr_load(int ctr, int val) | |
113 | { | |
9f2d1f0d AC |
114 | outb(val & 0xFF, WDT_COUNT0 + ctr); |
115 | udelay(8); | |
116 | outb(val >> 8, WDT_COUNT0 + ctr); | |
117 | udelay(8); | |
1da177e4 LT |
118 | } |
119 | ||
120 | /** | |
121 | * wdtpci_start: | |
122 | * | |
123 | * Start the watchdog driver. | |
124 | */ | |
125 | ||
126 | static 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 | */ | |
9f2d1f0d AC |
136 | 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 */ | |
1da177e4 | 162 | /* DO NOT LOAD CTR2 on PCI card! -- JPN */ |
9f2d1f0d AC |
163 | outb(0, WDT_DC); /* Enable watchdog */ |
164 | udelay(8); | |
1da177e4 LT |
165 | |
166 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
167 | return 0; | |
168 | } | |
169 | ||
170 | /** | |
171 | * wdtpci_stop: | |
172 | * | |
173 | * Stop the watchdog driver. | |
174 | */ | |
175 | ||
9f2d1f0d | 176 | static int wdtpci_stop(void) |
1da177e4 LT |
177 | { |
178 | unsigned long flags; | |
179 | ||
180 | /* Turn the card off */ | |
181 | spin_lock_irqsave(&wdtpci_lock, flags); | |
9f2d1f0d AC |
182 | inb(WDT_DC); /* Disable watchdog */ |
183 | udelay(8); | |
184 | wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */ | |
1da177e4 LT |
185 | spin_unlock_irqrestore(&wdtpci_lock, flags); |
186 | return 0; | |
187 | } | |
188 | ||
189 | /** | |
190 | * wdtpci_ping: | |
191 | * | |
9f2d1f0d AC |
192 | * Reload counter one with the watchdog heartbeat. We don't bother |
193 | * reloading the cascade counter. | |
1da177e4 LT |
194 | */ |
195 | ||
196 | static int wdtpci_ping(void) | |
197 | { | |
198 | unsigned long flags; | |
199 | ||
1da177e4 | 200 | spin_lock_irqsave(&wdtpci_lock, flags); |
9f2d1f0d AC |
201 | /* 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); | |
1da177e4 LT |
209 | 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 | * | |
9f2d1f0d AC |
217 | * 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. | |
1da177e4 LT |
220 | */ |
221 | static int wdtpci_set_heartbeat(int t) | |
222 | { | |
223 | /* Arbitrary, can't find the card's limits */ | |
9f2d1f0d | 224 | if (t < 1 || t > 65535) |
1da177e4 LT |
225 | 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 | ||
243 | static int wdtpci_get_status(int *status) | |
244 | { | |
9f2d1f0d AC |
245 | unsigned char new_status; |
246 | unsigned long flags; | |
247 | ||
248 | spin_lock_irqsave(&wdtpci_lock, flags); | |
249 | new_status = inb(WDT_SR); | |
250 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
1da177e4 | 251 | |
9f2d1f0d | 252 | *status = 0; |
1da177e4 LT |
253 | if (new_status & WDC_SR_ISOI0) |
254 | *status |= WDIOF_EXTERN1; | |
255 | if (new_status & WDC_SR_ISII1) | |
256 | *status |= WDIOF_EXTERN2; | |
9b901ee0 WVS |
257 | 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 | } | |
1da177e4 | 268 | } |
1da177e4 LT |
269 | return 0; |
270 | } | |
271 | ||
1da177e4 LT |
272 | /** |
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 | ||
279 | static int wdtpci_get_temperature(int *temperature) | |
280 | { | |
9f2d1f0d AC |
281 | 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); | |
1da177e4 LT |
287 | *temperature = (c * 11 / 15) + 7; |
288 | return 0; | |
289 | } | |
1da177e4 LT |
290 | |
291 | /** | |
292 | * wdtpci_interrupt: | |
293 | * @irq: Interrupt number | |
294 | * @dev_id: Unused as we don't allow multiple devices. | |
1da177e4 LT |
295 | * |
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 | ||
7d12e780 | 301 | static irqreturn_t wdtpci_interrupt(int irq, void *dev_id) |
1da177e4 LT |
302 | { |
303 | /* | |
304 | * Read the status register see what is up and | |
305 | * then printk it. | |
306 | */ | |
9f2d1f0d AC |
307 | unsigned char status; |
308 | ||
309 | spin_lock(&wdtpci_lock); | |
310 | ||
311 | status = inb(WDT_SR); | |
312 | udelay(8); | |
1da177e4 | 313 | |
27c766aa | 314 | pr_crit("status %d\n", status); |
1da177e4 | 315 | |
9b901ee0 WVS |
316 | if (type == 501) { |
317 | if (!(status & WDC_SR_TGOOD)) { | |
27c766aa | 318 | pr_crit("Overheat alarm (%d)\n", inb(WDT_RT)); |
9b901ee0 WVS |
319 | udelay(8); |
320 | } | |
321 | if (!(status & WDC_SR_PSUOVER)) | |
27c766aa | 322 | pr_crit("PSU over voltage\n"); |
9b901ee0 | 323 | if (!(status & WDC_SR_PSUUNDR)) |
27c766aa | 324 | pr_crit("PSU under voltage\n"); |
9b901ee0 WVS |
325 | if (tachometer) { |
326 | if (!(status & WDC_SR_FANGOOD)) | |
27c766aa | 327 | pr_crit("Possible fan fault\n"); |
9b901ee0 | 328 | } |
1da177e4 | 329 | } |
9b901ee0 | 330 | if (!(status & WDC_SR_WCCR)) { |
1da177e4 LT |
331 | #ifdef SOFTWARE_REBOOT |
332 | #ifdef ONLY_TESTING | |
27c766aa | 333 | pr_crit("Would Reboot\n"); |
1da177e4 | 334 | #else |
27c766aa | 335 | pr_crit("Initiating system reboot\n"); |
f82567e5 | 336 | emergency_restart(NULL); |
1da177e4 LT |
337 | #endif |
338 | #else | |
27c766aa | 339 | pr_crit("Reset in 5ms\n"); |
1da177e4 | 340 | #endif |
59338d4c | 341 | } |
9f2d1f0d | 342 | spin_unlock(&wdtpci_lock); |
1da177e4 LT |
343 | 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 | ||
9f2d1f0d | 358 | static ssize_t wdtpci_write(struct file *file, const char __user *buf, |
9b901ee0 | 359 | size_t count, loff_t *ppos) |
1da177e4 LT |
360 | { |
361 | if (count) { | |
362 | if (!nowayout) { | |
363 | size_t i; | |
364 | ||
9b901ee0 | 365 | /* In case it was set long ago */ |
1da177e4 LT |
366 | expect_close = 0; |
367 | ||
368 | for (i = 0; i != count; i++) { | |
369 | char c; | |
7944d3a5 | 370 | if (get_user(c, buf + i)) |
1da177e4 LT |
371 | return -EFAULT; |
372 | if (c == 'V') | |
373 | expect_close = 42; | |
374 | } | |
375 | } | |
376 | wdtpci_ping(); | |
377 | } | |
1da177e4 LT |
378 | return count; |
379 | } | |
380 | ||
381 | /** | |
382 | * wdtpci_ioctl: | |
1da177e4 LT |
383 | * @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 | ||
9f2d1f0d AC |
392 | static long wdtpci_ioctl(struct file *file, unsigned int cmd, |
393 | unsigned long arg) | |
1da177e4 | 394 | { |
1da177e4 LT |
395 | void __user *argp = (void __user *)arg; |
396 | int __user *p = argp; | |
9b901ee0 WVS |
397 | int new_heartbeat; |
398 | int status; | |
1da177e4 | 399 | |
c1bf3acf | 400 | struct watchdog_info ident = { |
1da177e4 LT |
401 | .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); | |
9b901ee0 WVS |
410 | if (type == 501) { |
411 | ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER| | |
412 | WDIOF_POWEROVER); | |
413 | if (tachometer) | |
414 | ident.options |= WDIOF_FANFAULT; | |
415 | } | |
1da177e4 | 416 | |
9f2d1f0d | 417 | switch (cmd) { |
9f2d1f0d AC |
418 | 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); | |
0c06090c WVS |
437 | default: |
438 | return -ENOTTY; | |
439 | } | |
1da177e4 LT |
440 | } |
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 | ||
454 | static int wdtpci_open(struct inode *inode, struct file *file) | |
455 | { | |
9f2d1f0d | 456 | if (test_and_set_bit(0, &open_lock)) |
1da177e4 LT |
457 | return -EBUSY; |
458 | ||
9f2d1f0d | 459 | if (nowayout) |
1da177e4 | 460 | __module_get(THIS_MODULE); |
1da177e4 LT |
461 | /* |
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 | ||
480 | static int wdtpci_release(struct inode *inode, struct file *file) | |
481 | { | |
482 | if (expect_close == 42) { | |
483 | wdtpci_stop(); | |
484 | } else { | |
27c766aa | 485 | pr_crit("Unexpected close, not stopping timer!\n"); |
1da177e4 LT |
486 | wdtpci_ping(); |
487 | } | |
488 | expect_close = 0; | |
9f2d1f0d | 489 | clear_bit(0, &open_lock); |
1da177e4 LT |
490 | return 0; |
491 | } | |
492 | ||
1da177e4 LT |
493 | /** |
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 | ||
9f2d1f0d AC |
504 | static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, |
505 | size_t count, loff_t *ptr) | |
1da177e4 LT |
506 | { |
507 | int temperature; | |
508 | ||
509 | if (wdtpci_get_temperature(&temperature)) | |
510 | return -EFAULT; | |
511 | ||
9f2d1f0d | 512 | if (copy_to_user(buf, &temperature, 1)) |
1da177e4 LT |
513 | 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 | ||
526 | static 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 | ||
539 | static int wdtpci_temp_release(struct inode *inode, struct file *file) | |
540 | { | |
541 | return 0; | |
542 | } | |
1da177e4 LT |
543 | |
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 | ||
556 | static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code, | |
9f2d1f0d | 557 | void *unused) |
1da177e4 | 558 | { |
9f2d1f0d | 559 | if (code == SYS_DOWN || code == SYS_HALT) |
1da177e4 | 560 | wdtpci_stop(); |
1da177e4 LT |
561 | return NOTIFY_DONE; |
562 | } | |
563 | ||
564 | /* | |
565 | * Kernel Interfaces | |
566 | */ | |
567 | ||
568 | ||
62322d25 | 569 | static const struct file_operations wdtpci_fops = { |
1da177e4 LT |
570 | .owner = THIS_MODULE, |
571 | .llseek = no_llseek, | |
572 | .write = wdtpci_write, | |
9f2d1f0d | 573 | .unlocked_ioctl = wdtpci_ioctl, |
1da177e4 LT |
574 | .open = wdtpci_open, |
575 | .release = wdtpci_release, | |
576 | }; | |
577 | ||
578 | static struct miscdevice wdtpci_miscdev = { | |
579 | .minor = WATCHDOG_MINOR, | |
580 | .name = "watchdog", | |
581 | .fops = &wdtpci_fops, | |
582 | }; | |
583 | ||
62322d25 | 584 | static const struct file_operations wdtpci_temp_fops = { |
1da177e4 LT |
585 | .owner = THIS_MODULE, |
586 | .llseek = no_llseek, | |
587 | .read = wdtpci_temp_read, | |
588 | .open = wdtpci_temp_open, | |
589 | .release = wdtpci_temp_release, | |
590 | }; | |
591 | ||
592 | static struct miscdevice temp_miscdev = { | |
593 | .minor = TEMP_MINOR, | |
594 | .name = "temperature", | |
595 | .fops = &wdtpci_temp_fops, | |
596 | }; | |
1da177e4 LT |
597 | |
598 | /* | |
599 | * The WDT card needs to learn about soft shutdowns in order to | |
600 | * turn the timebomb registers off. | |
601 | */ | |
602 | ||
603 | static struct notifier_block wdtpci_notifier = { | |
604 | .notifier_call = wdtpci_notify_sys, | |
605 | }; | |
606 | ||
607 | ||
2d991a16 | 608 | static int wdtpci_init_one(struct pci_dev *dev, |
9f2d1f0d | 609 | const struct pci_device_id *ent) |
1da177e4 LT |
610 | { |
611 | int ret = -EIO; | |
612 | ||
613 | dev_count++; | |
614 | if (dev_count > 1) { | |
27c766aa | 615 | pr_err("This driver only supports one device\n"); |
1da177e4 LT |
616 | return -ENODEV; |
617 | } | |
618 | ||
9b901ee0 | 619 | if (type != 500 && type != 501) { |
27c766aa | 620 | pr_err("unknown card type '%d'\n", type); |
9b901ee0 WVS |
621 | return -ENODEV; |
622 | } | |
623 | ||
9f2d1f0d | 624 | if (pci_enable_device(dev)) { |
27c766aa | 625 | pr_err("Not possible to enable PCI Device\n"); |
1da177e4 LT |
626 | return -ENODEV; |
627 | } | |
628 | ||
9f2d1f0d | 629 | if (pci_resource_start(dev, 2) == 0x0000) { |
27c766aa | 630 | pr_err("No I/O-Address for card detected\n"); |
1da177e4 LT |
631 | ret = -ENODEV; |
632 | goto out_pci; | |
633 | } | |
634 | ||
119d3e56 | 635 | if (pci_request_region(dev, 2, "wdt_pci")) { |
27c766aa JP |
636 | pr_err("I/O address 0x%llx already in use\n", |
637 | (unsigned long long)pci_resource_start(dev, 2)); | |
1da177e4 LT |
638 | goto out_pci; |
639 | } | |
640 | ||
119d3e56 WVS |
641 | irq = dev->irq; |
642 | io = pci_resource_start(dev, 2); | |
643 | ||
86b59128 | 644 | if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED, |
1da177e4 | 645 | "wdt_pci", &wdtpci_miscdev)) { |
27c766aa | 646 | pr_err("IRQ %d is not free\n", irq); |
1da177e4 LT |
647 | goto out_reg; |
648 | } | |
649 | ||
27c766aa JP |
650 | pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n", |
651 | (unsigned long long)io, irq); | |
1da177e4 | 652 | |
9f2d1f0d AC |
653 | /* Check that the heartbeat value is within its range; |
654 | if not reset to the default */ | |
1da177e4 LT |
655 | if (wdtpci_set_heartbeat(heartbeat)) { |
656 | wdtpci_set_heartbeat(WD_TIMO); | |
27c766aa JP |
657 | pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n", |
658 | WD_TIMO); | |
1da177e4 LT |
659 | } |
660 | ||
9f2d1f0d | 661 | ret = register_reboot_notifier(&wdtpci_notifier); |
1da177e4 | 662 | if (ret) { |
27c766aa | 663 | pr_err("cannot register reboot notifier (err=%d)\n", ret); |
1da177e4 LT |
664 | goto out_irq; |
665 | } | |
666 | ||
9b901ee0 WVS |
667 | if (type == 501) { |
668 | ret = misc_register(&temp_miscdev); | |
669 | if (ret) { | |
27c766aa JP |
670 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
671 | TEMP_MINOR, ret); | |
9b901ee0 WVS |
672 | goto out_rbt; |
673 | } | |
1da177e4 | 674 | } |
1da177e4 | 675 | |
9f2d1f0d | 676 | ret = misc_register(&wdtpci_miscdev); |
1da177e4 | 677 | if (ret) { |
27c766aa JP |
678 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
679 | WATCHDOG_MINOR, ret); | |
1da177e4 LT |
680 | goto out_misc; |
681 | } | |
682 | ||
27c766aa | 683 | pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", |
1da177e4 | 684 | heartbeat, nowayout); |
9b901ee0 | 685 | if (type == 501) |
27c766aa JP |
686 | pr_info("Fan Tachometer is %s\n", |
687 | tachometer ? "Enabled" : "Disabled"); | |
1da177e4 LT |
688 | |
689 | ret = 0; | |
690 | out: | |
691 | return ret; | |
692 | ||
693 | out_misc: | |
9b901ee0 WVS |
694 | if (type == 501) |
695 | misc_deregister(&temp_miscdev); | |
1da177e4 | 696 | out_rbt: |
1da177e4 LT |
697 | unregister_reboot_notifier(&wdtpci_notifier); |
698 | out_irq: | |
699 | free_irq(irq, &wdtpci_miscdev); | |
700 | out_reg: | |
119d3e56 | 701 | pci_release_region(dev, 2); |
1da177e4 LT |
702 | out_pci: |
703 | pci_disable_device(dev); | |
704 | goto out; | |
705 | } | |
706 | ||
707 | ||
4b12b896 | 708 | static void wdtpci_remove_one(struct pci_dev *pdev) |
1da177e4 LT |
709 | { |
710 | /* here we assume only one device will ever have | |
711 | * been picked up and registered by probe function */ | |
712 | misc_deregister(&wdtpci_miscdev); | |
9b901ee0 WVS |
713 | if (type == 501) |
714 | misc_deregister(&temp_miscdev); | |
1da177e4 LT |
715 | unregister_reboot_notifier(&wdtpci_notifier); |
716 | free_irq(irq, &wdtpci_miscdev); | |
119d3e56 | 717 | pci_release_region(pdev, 2); |
1da177e4 LT |
718 | pci_disable_device(pdev); |
719 | dev_count--; | |
720 | } | |
721 | ||
722 | ||
4562f539 | 723 | static DEFINE_PCI_DEVICE_TABLE(wdtpci_pci_tbl) = { |
1da177e4 LT |
724 | { |
725 | .vendor = PCI_VENDOR_ID_ACCESSIO, | |
9f2cc6f7 | 726 | .device = PCI_DEVICE_ID_ACCESSIO_WDG_CSM, |
1da177e4 LT |
727 | .subvendor = PCI_ANY_ID, |
728 | .subdevice = PCI_ANY_ID, | |
729 | }, | |
730 | { 0, }, /* terminate list */ | |
731 | }; | |
732 | MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl); | |
733 | ||
734 | ||
735 | static struct pci_driver wdtpci_driver = { | |
736 | .name = "wdt_pci", | |
737 | .id_table = wdtpci_pci_tbl, | |
738 | .probe = wdtpci_init_one, | |
82268714 | 739 | .remove = wdtpci_remove_one, |
1da177e4 LT |
740 | }; |
741 | ||
5ce9c371 | 742 | module_pci_driver(wdtpci_driver); |
1da177e4 LT |
743 | |
744 | MODULE_AUTHOR("JP Nollmann, Alan Cox"); | |
745 | MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards"); | |
746 | MODULE_LICENSE("GPL"); | |
747 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
748 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |