Commit | Line | Data |
---|---|---|
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 | #include <asm/system.h> |
59 | ||
60 | #define WDT_IS_PCI | |
61 | #include "wd501p.h" | |
62 | ||
1da177e4 LT |
63 | /* We can only use 1 card due to the /dev/watchdog restriction */ |
64 | static int dev_count; | |
65 | ||
9f2d1f0d | 66 | static unsigned long open_lock; |
c7dfd0cc | 67 | static DEFINE_SPINLOCK(wdtpci_lock); |
1da177e4 LT |
68 | static char expect_close; |
69 | ||
d1833c21 | 70 | static resource_size_t io; |
1da177e4 LT |
71 | static int irq; |
72 | ||
73 | /* Default timeout */ | |
74 | #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ | |
75 | ||
76 | static int heartbeat = WD_TIMO; | |
77 | static int wd_heartbeat; | |
78 | module_param(heartbeat, int, 0); | |
9f2d1f0d AC |
79 | MODULE_PARM_DESC(heartbeat, |
80 | "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" | |
81 | __MODULE_STRING(WD_TIMO) ")"); | |
1da177e4 | 82 | |
4bfdf378 | 83 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 84 | module_param(nowayout, int, 0); |
9f2d1f0d AC |
85 | MODULE_PARM_DESC(nowayout, |
86 | "Watchdog cannot be stopped once started (default=" | |
87 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
1da177e4 | 88 | |
1da177e4 LT |
89 | /* Support for the Fan Tachometer on the PCI-WDT501 */ |
90 | static int tachometer; | |
1da177e4 | 91 | module_param(tachometer, int, 0); |
9f2d1f0d | 92 | MODULE_PARM_DESC(tachometer, |
9b901ee0 WVS |
93 | "PCI-WDT501 Fan Tachometer support (0=disable, default=0)"); |
94 | ||
95 | static int type = 500; | |
96 | module_param(type, int, 0); | |
97 | MODULE_PARM_DESC(type, | |
98 | "PCI-WDT501 Card type (500 or 501 , default=500)"); | |
1da177e4 LT |
99 | |
100 | /* | |
101 | * Programming support | |
102 | */ | |
103 | ||
104 | static void wdtpci_ctr_mode(int ctr, int mode) | |
105 | { | |
9f2d1f0d AC |
106 | ctr <<= 6; |
107 | ctr |= 0x30; | |
108 | ctr |= (mode << 1); | |
109 | outb(ctr, WDT_CR); | |
110 | udelay(8); | |
1da177e4 LT |
111 | } |
112 | ||
113 | static void wdtpci_ctr_load(int ctr, int val) | |
114 | { | |
9f2d1f0d AC |
115 | outb(val & 0xFF, WDT_COUNT0 + ctr); |
116 | udelay(8); | |
117 | outb(val >> 8, WDT_COUNT0 + ctr); | |
118 | udelay(8); | |
1da177e4 LT |
119 | } |
120 | ||
121 | /** | |
122 | * wdtpci_start: | |
123 | * | |
124 | * Start the watchdog driver. | |
125 | */ | |
126 | ||
127 | static int wdtpci_start(void) | |
128 | { | |
129 | unsigned long flags; | |
130 | ||
131 | spin_lock_irqsave(&wdtpci_lock, flags); | |
132 | ||
133 | /* | |
134 | * "pet" the watchdog, as Access says. | |
135 | * This resets the clock outputs. | |
136 | */ | |
9f2d1f0d AC |
137 | inb(WDT_DC); /* Disable watchdog */ |
138 | udelay(8); | |
139 | wdtpci_ctr_mode(2, 0); /* Program CTR2 for Mode 0: | |
140 | Pulse on Terminal Count */ | |
141 | outb(0, WDT_DC); /* Enable watchdog */ | |
142 | udelay(8); | |
143 | inb(WDT_DC); /* Disable watchdog */ | |
144 | udelay(8); | |
145 | outb(0, WDT_CLOCK); /* 2.0833MHz clock */ | |
146 | udelay(8); | |
147 | inb(WDT_BUZZER); /* disable */ | |
148 | udelay(8); | |
149 | inb(WDT_OPTONOTRST); /* disable */ | |
150 | udelay(8); | |
151 | inb(WDT_OPTORST); /* disable */ | |
152 | udelay(8); | |
153 | inb(WDT_PROGOUT); /* disable */ | |
154 | udelay(8); | |
155 | wdtpci_ctr_mode(0, 3); /* Program CTR0 for Mode 3: | |
156 | Square Wave Generator */ | |
157 | wdtpci_ctr_mode(1, 2); /* Program CTR1 for Mode 2: | |
158 | Rate Generator */ | |
159 | wdtpci_ctr_mode(2, 1); /* Program CTR2 for Mode 1: | |
160 | Retriggerable One-Shot */ | |
161 | wdtpci_ctr_load(0, 20833); /* count at 100Hz */ | |
162 | wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */ | |
1da177e4 | 163 | /* DO NOT LOAD CTR2 on PCI card! -- JPN */ |
9f2d1f0d AC |
164 | outb(0, WDT_DC); /* Enable watchdog */ |
165 | udelay(8); | |
1da177e4 LT |
166 | |
167 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | /** | |
172 | * wdtpci_stop: | |
173 | * | |
174 | * Stop the watchdog driver. | |
175 | */ | |
176 | ||
9f2d1f0d | 177 | static int wdtpci_stop(void) |
1da177e4 LT |
178 | { |
179 | unsigned long flags; | |
180 | ||
181 | /* Turn the card off */ | |
182 | spin_lock_irqsave(&wdtpci_lock, flags); | |
9f2d1f0d AC |
183 | inb(WDT_DC); /* Disable watchdog */ |
184 | udelay(8); | |
185 | wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */ | |
1da177e4 LT |
186 | spin_unlock_irqrestore(&wdtpci_lock, flags); |
187 | return 0; | |
188 | } | |
189 | ||
190 | /** | |
191 | * wdtpci_ping: | |
192 | * | |
9f2d1f0d AC |
193 | * Reload counter one with the watchdog heartbeat. We don't bother |
194 | * reloading the cascade counter. | |
1da177e4 LT |
195 | */ |
196 | ||
197 | static int wdtpci_ping(void) | |
198 | { | |
199 | unsigned long flags; | |
200 | ||
1da177e4 | 201 | spin_lock_irqsave(&wdtpci_lock, flags); |
9f2d1f0d AC |
202 | /* Write a watchdog value */ |
203 | inb(WDT_DC); /* Disable watchdog */ | |
204 | udelay(8); | |
205 | wdtpci_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2: | |
206 | Rate Generator */ | |
207 | wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */ | |
208 | outb(0, WDT_DC); /* Enable watchdog */ | |
209 | udelay(8); | |
1da177e4 LT |
210 | spin_unlock_irqrestore(&wdtpci_lock, flags); |
211 | return 0; | |
212 | } | |
213 | ||
214 | /** | |
215 | * wdtpci_set_heartbeat: | |
216 | * @t: the new heartbeat value that needs to be set. | |
217 | * | |
9f2d1f0d AC |
218 | * Set a new heartbeat value for the watchdog device. If the heartbeat |
219 | * value is incorrect we keep the old value and return -EINVAL. | |
220 | * If successful we return 0. | |
1da177e4 LT |
221 | */ |
222 | static int wdtpci_set_heartbeat(int t) | |
223 | { | |
224 | /* Arbitrary, can't find the card's limits */ | |
9f2d1f0d | 225 | if (t < 1 || t > 65535) |
1da177e4 LT |
226 | return -EINVAL; |
227 | ||
228 | heartbeat = t; | |
229 | wd_heartbeat = t * 100; | |
230 | return 0; | |
231 | } | |
232 | ||
233 | /** | |
234 | * wdtpci_get_status: | |
235 | * @status: the new status. | |
236 | * | |
237 | * Extract the status information from a WDT watchdog device. There are | |
238 | * several board variants so we have to know which bits are valid. Some | |
239 | * bits default to one and some to zero in order to be maximally painful. | |
240 | * | |
241 | * we then map the bits onto the status ioctl flags. | |
242 | */ | |
243 | ||
244 | static int wdtpci_get_status(int *status) | |
245 | { | |
9f2d1f0d AC |
246 | unsigned char new_status; |
247 | unsigned long flags; | |
248 | ||
249 | spin_lock_irqsave(&wdtpci_lock, flags); | |
250 | new_status = inb(WDT_SR); | |
251 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
1da177e4 | 252 | |
9f2d1f0d | 253 | *status = 0; |
1da177e4 LT |
254 | if (new_status & WDC_SR_ISOI0) |
255 | *status |= WDIOF_EXTERN1; | |
256 | if (new_status & WDC_SR_ISII1) | |
257 | *status |= WDIOF_EXTERN2; | |
9b901ee0 WVS |
258 | if (type == 501) { |
259 | if (!(new_status & WDC_SR_TGOOD)) | |
260 | *status |= WDIOF_OVERHEAT; | |
261 | if (!(new_status & WDC_SR_PSUOVER)) | |
262 | *status |= WDIOF_POWEROVER; | |
263 | if (!(new_status & WDC_SR_PSUUNDR)) | |
264 | *status |= WDIOF_POWERUNDER; | |
265 | if (tachometer) { | |
266 | if (!(new_status & WDC_SR_FANGOOD)) | |
267 | *status |= WDIOF_FANFAULT; | |
268 | } | |
1da177e4 | 269 | } |
1da177e4 LT |
270 | return 0; |
271 | } | |
272 | ||
1da177e4 LT |
273 | /** |
274 | * wdtpci_get_temperature: | |
275 | * | |
276 | * Reports the temperature in degrees Fahrenheit. The API is in | |
277 | * farenheit. It was designed by an imperial measurement luddite. | |
278 | */ | |
279 | ||
280 | static int wdtpci_get_temperature(int *temperature) | |
281 | { | |
9f2d1f0d AC |
282 | unsigned short c; |
283 | unsigned long flags; | |
284 | spin_lock_irqsave(&wdtpci_lock, flags); | |
285 | c = inb(WDT_RT); | |
286 | udelay(8); | |
287 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
1da177e4 LT |
288 | *temperature = (c * 11 / 15) + 7; |
289 | return 0; | |
290 | } | |
1da177e4 LT |
291 | |
292 | /** | |
293 | * wdtpci_interrupt: | |
294 | * @irq: Interrupt number | |
295 | * @dev_id: Unused as we don't allow multiple devices. | |
1da177e4 LT |
296 | * |
297 | * Handle an interrupt from the board. These are raised when the status | |
298 | * map changes in what the board considers an interesting way. That means | |
299 | * a failure condition occurring. | |
300 | */ | |
301 | ||
7d12e780 | 302 | static irqreturn_t wdtpci_interrupt(int irq, void *dev_id) |
1da177e4 LT |
303 | { |
304 | /* | |
305 | * Read the status register see what is up and | |
306 | * then printk it. | |
307 | */ | |
9f2d1f0d AC |
308 | unsigned char status; |
309 | ||
310 | spin_lock(&wdtpci_lock); | |
311 | ||
312 | status = inb(WDT_SR); | |
313 | udelay(8); | |
1da177e4 | 314 | |
27c766aa | 315 | pr_crit("status %d\n", status); |
1da177e4 | 316 | |
9b901ee0 WVS |
317 | if (type == 501) { |
318 | if (!(status & WDC_SR_TGOOD)) { | |
27c766aa | 319 | pr_crit("Overheat alarm (%d)\n", inb(WDT_RT)); |
9b901ee0 WVS |
320 | udelay(8); |
321 | } | |
322 | if (!(status & WDC_SR_PSUOVER)) | |
27c766aa | 323 | pr_crit("PSU over voltage\n"); |
9b901ee0 | 324 | if (!(status & WDC_SR_PSUUNDR)) |
27c766aa | 325 | pr_crit("PSU under voltage\n"); |
9b901ee0 WVS |
326 | if (tachometer) { |
327 | if (!(status & WDC_SR_FANGOOD)) | |
27c766aa | 328 | pr_crit("Possible fan fault\n"); |
9b901ee0 | 329 | } |
1da177e4 | 330 | } |
9b901ee0 | 331 | if (!(status & WDC_SR_WCCR)) { |
1da177e4 LT |
332 | #ifdef SOFTWARE_REBOOT |
333 | #ifdef ONLY_TESTING | |
27c766aa | 334 | pr_crit("Would Reboot\n"); |
1da177e4 | 335 | #else |
27c766aa | 336 | pr_crit("Initiating system reboot\n"); |
f82567e5 | 337 | emergency_restart(NULL); |
1da177e4 LT |
338 | #endif |
339 | #else | |
27c766aa | 340 | pr_crit("Reset in 5ms\n"); |
1da177e4 | 341 | #endif |
59338d4c | 342 | } |
9f2d1f0d | 343 | spin_unlock(&wdtpci_lock); |
1da177e4 LT |
344 | return IRQ_HANDLED; |
345 | } | |
346 | ||
347 | ||
348 | /** | |
349 | * wdtpci_write: | |
350 | * @file: file handle to the watchdog | |
351 | * @buf: buffer to write (unused as data does not matter here | |
352 | * @count: count of bytes | |
353 | * @ppos: pointer to the position to write. No seeks allowed | |
354 | * | |
355 | * A write to a watchdog device is defined as a keepalive signal. Any | |
356 | * write of data will do, as we we don't define content meaning. | |
357 | */ | |
358 | ||
9f2d1f0d | 359 | static ssize_t wdtpci_write(struct file *file, const char __user *buf, |
9b901ee0 | 360 | size_t count, loff_t *ppos) |
1da177e4 LT |
361 | { |
362 | if (count) { | |
363 | if (!nowayout) { | |
364 | size_t i; | |
365 | ||
9b901ee0 | 366 | /* In case it was set long ago */ |
1da177e4 LT |
367 | expect_close = 0; |
368 | ||
369 | for (i = 0; i != count; i++) { | |
370 | char c; | |
7944d3a5 | 371 | if (get_user(c, buf + i)) |
1da177e4 LT |
372 | return -EFAULT; |
373 | if (c == 'V') | |
374 | expect_close = 42; | |
375 | } | |
376 | } | |
377 | wdtpci_ping(); | |
378 | } | |
1da177e4 LT |
379 | return count; |
380 | } | |
381 | ||
382 | /** | |
383 | * wdtpci_ioctl: | |
1da177e4 LT |
384 | * @file: file handle to the device |
385 | * @cmd: watchdog command | |
386 | * @arg: argument pointer | |
387 | * | |
388 | * The watchdog API defines a common set of functions for all watchdogs | |
389 | * according to their available features. We only actually usefully support | |
390 | * querying capabilities and current status. | |
391 | */ | |
392 | ||
9f2d1f0d AC |
393 | static long wdtpci_ioctl(struct file *file, unsigned int cmd, |
394 | unsigned long arg) | |
1da177e4 | 395 | { |
1da177e4 LT |
396 | void __user *argp = (void __user *)arg; |
397 | int __user *p = argp; | |
9b901ee0 WVS |
398 | int new_heartbeat; |
399 | int status; | |
1da177e4 | 400 | |
c1bf3acf | 401 | struct watchdog_info ident = { |
1da177e4 LT |
402 | .options = WDIOF_SETTIMEOUT| |
403 | WDIOF_MAGICCLOSE| | |
404 | WDIOF_KEEPALIVEPING, | |
405 | .firmware_version = 1, | |
406 | .identity = "PCI-WDT500/501", | |
407 | }; | |
408 | ||
409 | /* Add options according to the card we have */ | |
410 | ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); | |
9b901ee0 WVS |
411 | if (type == 501) { |
412 | ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER| | |
413 | WDIOF_POWEROVER); | |
414 | if (tachometer) | |
415 | ident.options |= WDIOF_FANFAULT; | |
416 | } | |
1da177e4 | 417 | |
9f2d1f0d | 418 | switch (cmd) { |
9f2d1f0d AC |
419 | case WDIOC_GETSUPPORT: |
420 | return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; | |
421 | case WDIOC_GETSTATUS: | |
422 | wdtpci_get_status(&status); | |
423 | return put_user(status, p); | |
424 | case WDIOC_GETBOOTSTATUS: | |
425 | return put_user(0, p); | |
426 | case WDIOC_KEEPALIVE: | |
427 | wdtpci_ping(); | |
428 | return 0; | |
429 | case WDIOC_SETTIMEOUT: | |
430 | if (get_user(new_heartbeat, p)) | |
431 | return -EFAULT; | |
432 | if (wdtpci_set_heartbeat(new_heartbeat)) | |
433 | return -EINVAL; | |
434 | wdtpci_ping(); | |
435 | /* Fall */ | |
436 | case WDIOC_GETTIMEOUT: | |
437 | return put_user(heartbeat, p); | |
0c06090c WVS |
438 | default: |
439 | return -ENOTTY; | |
440 | } | |
1da177e4 LT |
441 | } |
442 | ||
443 | /** | |
444 | * wdtpci_open: | |
445 | * @inode: inode of device | |
446 | * @file: file handle to device | |
447 | * | |
448 | * The watchdog device has been opened. The watchdog device is single | |
449 | * open and on opening we load the counters. Counter zero is a 100Hz | |
450 | * cascade, into counter 1 which downcounts to reboot. When the counter | |
451 | * triggers counter 2 downcounts the length of the reset pulse which | |
452 | * set set to be as long as possible. | |
453 | */ | |
454 | ||
455 | static int wdtpci_open(struct inode *inode, struct file *file) | |
456 | { | |
9f2d1f0d | 457 | if (test_and_set_bit(0, &open_lock)) |
1da177e4 LT |
458 | return -EBUSY; |
459 | ||
9f2d1f0d | 460 | if (nowayout) |
1da177e4 | 461 | __module_get(THIS_MODULE); |
1da177e4 LT |
462 | /* |
463 | * Activate | |
464 | */ | |
465 | wdtpci_start(); | |
466 | return nonseekable_open(inode, file); | |
467 | } | |
468 | ||
469 | /** | |
470 | * wdtpci_release: | |
471 | * @inode: inode to board | |
472 | * @file: file handle to board | |
473 | * | |
474 | * The watchdog has a configurable API. There is a religious dispute | |
475 | * between people who want their watchdog to be able to shut down and | |
476 | * those who want to be sure if the watchdog manager dies the machine | |
477 | * reboots. In the former case we disable the counters, in the latter | |
478 | * case you have to open it again very soon. | |
479 | */ | |
480 | ||
481 | static int wdtpci_release(struct inode *inode, struct file *file) | |
482 | { | |
483 | if (expect_close == 42) { | |
484 | wdtpci_stop(); | |
485 | } else { | |
27c766aa | 486 | pr_crit("Unexpected close, not stopping timer!\n"); |
1da177e4 LT |
487 | wdtpci_ping(); |
488 | } | |
489 | expect_close = 0; | |
9f2d1f0d | 490 | clear_bit(0, &open_lock); |
1da177e4 LT |
491 | return 0; |
492 | } | |
493 | ||
1da177e4 LT |
494 | /** |
495 | * wdtpci_temp_read: | |
496 | * @file: file handle to the watchdog board | |
497 | * @buf: buffer to write 1 byte into | |
498 | * @count: length of buffer | |
499 | * @ptr: offset (no seek allowed) | |
500 | * | |
501 | * Read reports the temperature in degrees Fahrenheit. The API is in | |
502 | * fahrenheit. It was designed by an imperial measurement luddite. | |
503 | */ | |
504 | ||
9f2d1f0d AC |
505 | static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, |
506 | size_t count, loff_t *ptr) | |
1da177e4 LT |
507 | { |
508 | int temperature; | |
509 | ||
510 | if (wdtpci_get_temperature(&temperature)) | |
511 | return -EFAULT; | |
512 | ||
9f2d1f0d | 513 | if (copy_to_user(buf, &temperature, 1)) |
1da177e4 LT |
514 | return -EFAULT; |
515 | ||
516 | return 1; | |
517 | } | |
518 | ||
519 | /** | |
520 | * wdtpci_temp_open: | |
521 | * @inode: inode of device | |
522 | * @file: file handle to device | |
523 | * | |
524 | * The temperature device has been opened. | |
525 | */ | |
526 | ||
527 | static int wdtpci_temp_open(struct inode *inode, struct file *file) | |
528 | { | |
529 | return nonseekable_open(inode, file); | |
530 | } | |
531 | ||
532 | /** | |
533 | * wdtpci_temp_release: | |
534 | * @inode: inode to board | |
535 | * @file: file handle to board | |
536 | * | |
537 | * The temperature device has been closed. | |
538 | */ | |
539 | ||
540 | static int wdtpci_temp_release(struct inode *inode, struct file *file) | |
541 | { | |
542 | return 0; | |
543 | } | |
1da177e4 LT |
544 | |
545 | /** | |
546 | * notify_sys: | |
547 | * @this: our notifier block | |
548 | * @code: the event being reported | |
549 | * @unused: unused | |
550 | * | |
551 | * Our notifier is called on system shutdowns. We want to turn the card | |
552 | * off at reboot otherwise the machine will reboot again during memory | |
553 | * test or worse yet during the following fsck. This would suck, in fact | |
554 | * trust me - if it happens it does suck. | |
555 | */ | |
556 | ||
557 | static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code, | |
9f2d1f0d | 558 | void *unused) |
1da177e4 | 559 | { |
9f2d1f0d | 560 | if (code == SYS_DOWN || code == SYS_HALT) |
1da177e4 | 561 | wdtpci_stop(); |
1da177e4 LT |
562 | return NOTIFY_DONE; |
563 | } | |
564 | ||
565 | /* | |
566 | * Kernel Interfaces | |
567 | */ | |
568 | ||
569 | ||
62322d25 | 570 | static const struct file_operations wdtpci_fops = { |
1da177e4 LT |
571 | .owner = THIS_MODULE, |
572 | .llseek = no_llseek, | |
573 | .write = wdtpci_write, | |
9f2d1f0d | 574 | .unlocked_ioctl = wdtpci_ioctl, |
1da177e4 LT |
575 | .open = wdtpci_open, |
576 | .release = wdtpci_release, | |
577 | }; | |
578 | ||
579 | static struct miscdevice wdtpci_miscdev = { | |
580 | .minor = WATCHDOG_MINOR, | |
581 | .name = "watchdog", | |
582 | .fops = &wdtpci_fops, | |
583 | }; | |
584 | ||
62322d25 | 585 | static const struct file_operations wdtpci_temp_fops = { |
1da177e4 LT |
586 | .owner = THIS_MODULE, |
587 | .llseek = no_llseek, | |
588 | .read = wdtpci_temp_read, | |
589 | .open = wdtpci_temp_open, | |
590 | .release = wdtpci_temp_release, | |
591 | }; | |
592 | ||
593 | static struct miscdevice temp_miscdev = { | |
594 | .minor = TEMP_MINOR, | |
595 | .name = "temperature", | |
596 | .fops = &wdtpci_temp_fops, | |
597 | }; | |
1da177e4 LT |
598 | |
599 | /* | |
600 | * The WDT card needs to learn about soft shutdowns in order to | |
601 | * turn the timebomb registers off. | |
602 | */ | |
603 | ||
604 | static struct notifier_block wdtpci_notifier = { | |
605 | .notifier_call = wdtpci_notify_sys, | |
606 | }; | |
607 | ||
608 | ||
9f2d1f0d AC |
609 | static int __devinit wdtpci_init_one(struct pci_dev *dev, |
610 | const struct pci_device_id *ent) | |
1da177e4 LT |
611 | { |
612 | int ret = -EIO; | |
613 | ||
614 | dev_count++; | |
615 | if (dev_count > 1) { | |
27c766aa | 616 | pr_err("This driver only supports one device\n"); |
1da177e4 LT |
617 | return -ENODEV; |
618 | } | |
619 | ||
9b901ee0 | 620 | if (type != 500 && type != 501) { |
27c766aa | 621 | pr_err("unknown card type '%d'\n", type); |
9b901ee0 WVS |
622 | return -ENODEV; |
623 | } | |
624 | ||
9f2d1f0d | 625 | if (pci_enable_device(dev)) { |
27c766aa | 626 | pr_err("Not possible to enable PCI Device\n"); |
1da177e4 LT |
627 | return -ENODEV; |
628 | } | |
629 | ||
9f2d1f0d | 630 | if (pci_resource_start(dev, 2) == 0x0000) { |
27c766aa | 631 | pr_err("No I/O-Address for card detected\n"); |
1da177e4 LT |
632 | ret = -ENODEV; |
633 | goto out_pci; | |
634 | } | |
635 | ||
119d3e56 | 636 | if (pci_request_region(dev, 2, "wdt_pci")) { |
27c766aa JP |
637 | pr_err("I/O address 0x%llx already in use\n", |
638 | (unsigned long long)pci_resource_start(dev, 2)); | |
1da177e4 LT |
639 | goto out_pci; |
640 | } | |
641 | ||
119d3e56 WVS |
642 | irq = dev->irq; |
643 | io = pci_resource_start(dev, 2); | |
644 | ||
86b59128 | 645 | if (request_irq(irq, wdtpci_interrupt, IRQF_SHARED, |
1da177e4 | 646 | "wdt_pci", &wdtpci_miscdev)) { |
27c766aa | 647 | pr_err("IRQ %d is not free\n", irq); |
1da177e4 LT |
648 | goto out_reg; |
649 | } | |
650 | ||
27c766aa JP |
651 | pr_info("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%llx (Interrupt %d)\n", |
652 | (unsigned long long)io, irq); | |
1da177e4 | 653 | |
9f2d1f0d AC |
654 | /* Check that the heartbeat value is within its range; |
655 | if not reset to the default */ | |
1da177e4 LT |
656 | if (wdtpci_set_heartbeat(heartbeat)) { |
657 | wdtpci_set_heartbeat(WD_TIMO); | |
27c766aa JP |
658 | pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n", |
659 | WD_TIMO); | |
1da177e4 LT |
660 | } |
661 | ||
9f2d1f0d | 662 | ret = register_reboot_notifier(&wdtpci_notifier); |
1da177e4 | 663 | if (ret) { |
27c766aa | 664 | pr_err("cannot register reboot notifier (err=%d)\n", ret); |
1da177e4 LT |
665 | goto out_irq; |
666 | } | |
667 | ||
9b901ee0 WVS |
668 | if (type == 501) { |
669 | ret = misc_register(&temp_miscdev); | |
670 | if (ret) { | |
27c766aa JP |
671 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
672 | TEMP_MINOR, ret); | |
9b901ee0 WVS |
673 | goto out_rbt; |
674 | } | |
1da177e4 | 675 | } |
1da177e4 | 676 | |
9f2d1f0d | 677 | ret = misc_register(&wdtpci_miscdev); |
1da177e4 | 678 | if (ret) { |
27c766aa JP |
679 | pr_err("cannot register miscdev on minor=%d (err=%d)\n", |
680 | WATCHDOG_MINOR, ret); | |
1da177e4 LT |
681 | goto out_misc; |
682 | } | |
683 | ||
27c766aa | 684 | pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", |
1da177e4 | 685 | heartbeat, nowayout); |
9b901ee0 | 686 | if (type == 501) |
27c766aa JP |
687 | pr_info("Fan Tachometer is %s\n", |
688 | tachometer ? "Enabled" : "Disabled"); | |
1da177e4 LT |
689 | |
690 | ret = 0; | |
691 | out: | |
692 | return ret; | |
693 | ||
694 | out_misc: | |
9b901ee0 WVS |
695 | if (type == 501) |
696 | misc_deregister(&temp_miscdev); | |
1da177e4 | 697 | out_rbt: |
1da177e4 LT |
698 | unregister_reboot_notifier(&wdtpci_notifier); |
699 | out_irq: | |
700 | free_irq(irq, &wdtpci_miscdev); | |
701 | out_reg: | |
119d3e56 | 702 | pci_release_region(dev, 2); |
1da177e4 LT |
703 | out_pci: |
704 | pci_disable_device(dev); | |
705 | goto out; | |
706 | } | |
707 | ||
708 | ||
9f2d1f0d | 709 | static void __devexit wdtpci_remove_one(struct pci_dev *pdev) |
1da177e4 LT |
710 | { |
711 | /* here we assume only one device will ever have | |
712 | * been picked up and registered by probe function */ | |
713 | misc_deregister(&wdtpci_miscdev); | |
9b901ee0 WVS |
714 | if (type == 501) |
715 | misc_deregister(&temp_miscdev); | |
1da177e4 LT |
716 | unregister_reboot_notifier(&wdtpci_notifier); |
717 | free_irq(irq, &wdtpci_miscdev); | |
119d3e56 | 718 | pci_release_region(pdev, 2); |
1da177e4 LT |
719 | pci_disable_device(pdev); |
720 | dev_count--; | |
721 | } | |
722 | ||
723 | ||
4562f539 | 724 | static DEFINE_PCI_DEVICE_TABLE(wdtpci_pci_tbl) = { |
1da177e4 LT |
725 | { |
726 | .vendor = PCI_VENDOR_ID_ACCESSIO, | |
9f2cc6f7 | 727 | .device = PCI_DEVICE_ID_ACCESSIO_WDG_CSM, |
1da177e4 LT |
728 | .subvendor = PCI_ANY_ID, |
729 | .subdevice = PCI_ANY_ID, | |
730 | }, | |
731 | { 0, }, /* terminate list */ | |
732 | }; | |
733 | MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl); | |
734 | ||
735 | ||
736 | static struct pci_driver wdtpci_driver = { | |
737 | .name = "wdt_pci", | |
738 | .id_table = wdtpci_pci_tbl, | |
739 | .probe = wdtpci_init_one, | |
740 | .remove = __devexit_p(wdtpci_remove_one), | |
741 | }; | |
742 | ||
743 | ||
744 | /** | |
745 | * wdtpci_cleanup: | |
746 | * | |
747 | * Unload the watchdog. You cannot do this with any file handles open. | |
748 | * If your watchdog is set to continue ticking on close and you unload | |
749 | * it, well it keeps ticking. We won't get the interrupt but the board | |
750 | * will not touch PC memory so all is fine. You just have to load a new | |
751 | * module in xx seconds or reboot. | |
752 | */ | |
753 | ||
754 | static void __exit wdtpci_cleanup(void) | |
755 | { | |
9f2d1f0d | 756 | pci_unregister_driver(&wdtpci_driver); |
1da177e4 LT |
757 | } |
758 | ||
759 | ||
760 | /** | |
5f3b2756 | 761 | * wdtpci_init: |
1da177e4 LT |
762 | * |
763 | * Set up the WDT watchdog board. All we have to do is grab the | |
764 | * resources we require and bitch if anyone beat us to them. | |
765 | * The open() function will actually kick the board off. | |
766 | */ | |
767 | ||
768 | static int __init wdtpci_init(void) | |
769 | { | |
9f2d1f0d | 770 | return pci_register_driver(&wdtpci_driver); |
1da177e4 LT |
771 | } |
772 | ||
773 | ||
774 | module_init(wdtpci_init); | |
775 | module_exit(wdtpci_cleanup); | |
776 | ||
777 | MODULE_AUTHOR("JP Nollmann, Alan Cox"); | |
778 | MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards"); | |
779 | MODULE_LICENSE("GPL"); | |
780 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
781 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |