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1da177e4 LT |
1 | /* |
2 | * Industrial Computer Source PCI-WDT500/501 driver | |
3 | * | |
4 | * (c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved. | |
5 | * http://www.redhat.com | |
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 | |
32 | * Tigran Aivazian : Restructured wdtpci_init_one() to handle failures | |
33 | * Joel Becker : Added WDIOC_GET/SETTIMEOUT | |
34 | * Zwane Mwaikambo : Magic char closing, locking changes, cleanups | |
35 | * Matt Domsch : nowayout module option | |
36 | */ | |
37 | ||
1da177e4 LT |
38 | #include <linux/interrupt.h> |
39 | #include <linux/module.h> | |
40 | #include <linux/moduleparam.h> | |
41 | #include <linux/types.h> | |
42 | #include <linux/miscdevice.h> | |
43 | #include <linux/watchdog.h> | |
44 | #include <linux/ioport.h> | |
45 | #include <linux/notifier.h> | |
46 | #include <linux/reboot.h> | |
47 | #include <linux/init.h> | |
48 | #include <linux/fs.h> | |
49 | #include <linux/pci.h> | |
50 | ||
51 | #include <asm/io.h> | |
52 | #include <asm/uaccess.h> | |
53 | #include <asm/system.h> | |
54 | ||
55 | #define WDT_IS_PCI | |
56 | #include "wd501p.h" | |
57 | ||
58 | #define PFX "wdt_pci: " | |
59 | ||
60 | /* | |
61 | * Until Access I/O gets their application for a PCI vendor ID approved, | |
62 | * I don't think that it's appropriate to move these constants into the | |
63 | * regular pci_ids.h file. -- JPN 2000/01/18 | |
64 | */ | |
65 | ||
66 | #ifndef PCI_VENDOR_ID_ACCESSIO | |
67 | #define PCI_VENDOR_ID_ACCESSIO 0x494f | |
68 | #endif | |
69 | #ifndef PCI_DEVICE_ID_WDG_CSM | |
70 | #define PCI_DEVICE_ID_WDG_CSM 0x22c0 | |
71 | #endif | |
72 | ||
73 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
74 | static int dev_count; | |
75 | ||
76 | static struct semaphore open_sem; | |
c7dfd0cc | 77 | static DEFINE_SPINLOCK(wdtpci_lock); |
1da177e4 LT |
78 | static char expect_close; |
79 | ||
80 | static int io; | |
81 | static int irq; | |
82 | ||
83 | /* Default timeout */ | |
84 | #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ | |
85 | ||
86 | static int heartbeat = WD_TIMO; | |
87 | static int wd_heartbeat; | |
88 | module_param(heartbeat, int, 0); | |
89 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")"); | |
90 | ||
4bfdf378 | 91 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 92 | module_param(nowayout, int, 0); |
bffda5c8 | 93 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
1da177e4 LT |
94 | |
95 | #ifdef CONFIG_WDT_501_PCI | |
96 | /* Support for the Fan Tachometer on the PCI-WDT501 */ | |
97 | static int tachometer; | |
98 | ||
99 | module_param(tachometer, int, 0); | |
100 | MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, default=0)"); | |
101 | #endif /* CONFIG_WDT_501_PCI */ | |
102 | ||
103 | /* | |
104 | * Programming support | |
105 | */ | |
106 | ||
107 | static void wdtpci_ctr_mode(int ctr, int mode) | |
108 | { | |
109 | ctr<<=6; | |
110 | ctr|=0x30; | |
111 | ctr|=(mode<<1); | |
112 | outb_p(ctr, WDT_CR); | |
113 | } | |
114 | ||
115 | static void wdtpci_ctr_load(int ctr, int val) | |
116 | { | |
117 | outb_p(val&0xFF, WDT_COUNT0+ctr); | |
118 | outb_p(val>>8, WDT_COUNT0+ctr); | |
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 | */ | |
137 | inb_p(WDT_DC); /* Disable watchdog */ | |
138 | wdtpci_ctr_mode(2,0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */ | |
139 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
140 | ||
141 | inb_p(WDT_DC); /* Disable watchdog */ | |
142 | outb_p(0, WDT_CLOCK); /* 2.0833MHz clock */ | |
143 | inb_p(WDT_BUZZER); /* disable */ | |
144 | inb_p(WDT_OPTONOTRST); /* disable */ | |
145 | inb_p(WDT_OPTORST); /* disable */ | |
146 | inb_p(WDT_PROGOUT); /* disable */ | |
147 | wdtpci_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */ | |
148 | wdtpci_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */ | |
149 | wdtpci_ctr_mode(2,1); /* Program CTR2 for Mode 1: Retriggerable One-Shot */ | |
150 | wdtpci_ctr_load(0,20833); /* count at 100Hz */ | |
151 | wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */ | |
152 | /* DO NOT LOAD CTR2 on PCI card! -- JPN */ | |
153 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
154 | ||
155 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
156 | return 0; | |
157 | } | |
158 | ||
159 | /** | |
160 | * wdtpci_stop: | |
161 | * | |
162 | * Stop the watchdog driver. | |
163 | */ | |
164 | ||
165 | static int wdtpci_stop (void) | |
166 | { | |
167 | unsigned long flags; | |
168 | ||
169 | /* Turn the card off */ | |
170 | spin_lock_irqsave(&wdtpci_lock, flags); | |
171 | inb_p(WDT_DC); /* Disable watchdog */ | |
172 | wdtpci_ctr_load(2,0); /* 0 length reset pulses now */ | |
173 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
174 | return 0; | |
175 | } | |
176 | ||
177 | /** | |
178 | * wdtpci_ping: | |
179 | * | |
180 | * Reload counter one with the watchdog heartbeat. We don't bother reloading | |
181 | * the cascade counter. | |
182 | */ | |
183 | ||
184 | static int wdtpci_ping(void) | |
185 | { | |
186 | unsigned long flags; | |
187 | ||
188 | /* Write a watchdog value */ | |
189 | spin_lock_irqsave(&wdtpci_lock, flags); | |
190 | inb_p(WDT_DC); /* Disable watchdog */ | |
191 | wdtpci_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */ | |
192 | wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */ | |
193 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
194 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
195 | return 0; | |
196 | } | |
197 | ||
198 | /** | |
199 | * wdtpci_set_heartbeat: | |
200 | * @t: the new heartbeat value that needs to be set. | |
201 | * | |
202 | * Set a new heartbeat value for the watchdog device. If the heartbeat value is | |
203 | * incorrect we keep the old value and return -EINVAL. If successfull we | |
204 | * return 0. | |
205 | */ | |
206 | static int wdtpci_set_heartbeat(int t) | |
207 | { | |
208 | /* Arbitrary, can't find the card's limits */ | |
209 | if ((t < 1) || (t > 65535)) | |
210 | return -EINVAL; | |
211 | ||
212 | heartbeat = t; | |
213 | wd_heartbeat = t * 100; | |
214 | return 0; | |
215 | } | |
216 | ||
217 | /** | |
218 | * wdtpci_get_status: | |
219 | * @status: the new status. | |
220 | * | |
221 | * Extract the status information from a WDT watchdog device. There are | |
222 | * several board variants so we have to know which bits are valid. Some | |
223 | * bits default to one and some to zero in order to be maximally painful. | |
224 | * | |
225 | * we then map the bits onto the status ioctl flags. | |
226 | */ | |
227 | ||
228 | static int wdtpci_get_status(int *status) | |
229 | { | |
230 | unsigned char new_status=inb_p(WDT_SR); | |
231 | ||
232 | *status=0; | |
233 | if (new_status & WDC_SR_ISOI0) | |
234 | *status |= WDIOF_EXTERN1; | |
235 | if (new_status & WDC_SR_ISII1) | |
236 | *status |= WDIOF_EXTERN2; | |
237 | #ifdef CONFIG_WDT_501_PCI | |
238 | if (!(new_status & WDC_SR_TGOOD)) | |
239 | *status |= WDIOF_OVERHEAT; | |
240 | if (!(new_status & WDC_SR_PSUOVER)) | |
241 | *status |= WDIOF_POWEROVER; | |
242 | if (!(new_status & WDC_SR_PSUUNDR)) | |
243 | *status |= WDIOF_POWERUNDER; | |
244 | if (tachometer) { | |
245 | if (!(new_status & WDC_SR_FANGOOD)) | |
246 | *status |= WDIOF_FANFAULT; | |
247 | } | |
248 | #endif /* CONFIG_WDT_501_PCI */ | |
249 | return 0; | |
250 | } | |
251 | ||
252 | #ifdef CONFIG_WDT_501_PCI | |
253 | /** | |
254 | * wdtpci_get_temperature: | |
255 | * | |
256 | * Reports the temperature in degrees Fahrenheit. The API is in | |
257 | * farenheit. It was designed by an imperial measurement luddite. | |
258 | */ | |
259 | ||
260 | static int wdtpci_get_temperature(int *temperature) | |
261 | { | |
262 | unsigned short c=inb_p(WDT_RT); | |
263 | ||
264 | *temperature = (c * 11 / 15) + 7; | |
265 | return 0; | |
266 | } | |
267 | #endif /* CONFIG_WDT_501_PCI */ | |
268 | ||
269 | /** | |
270 | * wdtpci_interrupt: | |
271 | * @irq: Interrupt number | |
272 | * @dev_id: Unused as we don't allow multiple devices. | |
1da177e4 LT |
273 | * |
274 | * Handle an interrupt from the board. These are raised when the status | |
275 | * map changes in what the board considers an interesting way. That means | |
276 | * a failure condition occurring. | |
277 | */ | |
278 | ||
7d12e780 | 279 | static irqreturn_t wdtpci_interrupt(int irq, void *dev_id) |
1da177e4 LT |
280 | { |
281 | /* | |
282 | * Read the status register see what is up and | |
283 | * then printk it. | |
284 | */ | |
285 | unsigned char status=inb_p(WDT_SR); | |
286 | ||
287 | printk(KERN_CRIT PFX "status %d\n", status); | |
288 | ||
289 | #ifdef CONFIG_WDT_501_PCI | |
290 | if (!(status & WDC_SR_TGOOD)) | |
291 | printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",inb_p(WDT_RT)); | |
292 | if (!(status & WDC_SR_PSUOVER)) | |
293 | printk(KERN_CRIT PFX "PSU over voltage.\n"); | |
294 | if (!(status & WDC_SR_PSUUNDR)) | |
295 | printk(KERN_CRIT PFX "PSU under voltage.\n"); | |
296 | if (tachometer) { | |
297 | if (!(status & WDC_SR_FANGOOD)) | |
298 | printk(KERN_CRIT PFX "Possible fan fault.\n"); | |
299 | } | |
300 | #endif /* CONFIG_WDT_501_PCI */ | |
59338d4c | 301 | if (!(status&WDC_SR_WCCR)) { |
1da177e4 LT |
302 | #ifdef SOFTWARE_REBOOT |
303 | #ifdef ONLY_TESTING | |
304 | printk(KERN_CRIT PFX "Would Reboot.\n"); | |
305 | #else | |
306 | printk(KERN_CRIT PFX "Initiating system reboot.\n"); | |
f82567e5 | 307 | emergency_restart(NULL); |
1da177e4 LT |
308 | #endif |
309 | #else | |
310 | printk(KERN_CRIT PFX "Reset in 5ms.\n"); | |
311 | #endif | |
59338d4c | 312 | } |
1da177e4 LT |
313 | return IRQ_HANDLED; |
314 | } | |
315 | ||
316 | ||
317 | /** | |
318 | * wdtpci_write: | |
319 | * @file: file handle to the watchdog | |
320 | * @buf: buffer to write (unused as data does not matter here | |
321 | * @count: count of bytes | |
322 | * @ppos: pointer to the position to write. No seeks allowed | |
323 | * | |
324 | * A write to a watchdog device is defined as a keepalive signal. Any | |
325 | * write of data will do, as we we don't define content meaning. | |
326 | */ | |
327 | ||
328 | static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
329 | { | |
330 | if (count) { | |
331 | if (!nowayout) { | |
332 | size_t i; | |
333 | ||
334 | expect_close = 0; | |
335 | ||
336 | for (i = 0; i != count; i++) { | |
337 | char c; | |
338 | if(get_user(c, buf+i)) | |
339 | return -EFAULT; | |
340 | if (c == 'V') | |
341 | expect_close = 42; | |
342 | } | |
343 | } | |
344 | wdtpci_ping(); | |
345 | } | |
346 | ||
347 | return count; | |
348 | } | |
349 | ||
350 | /** | |
351 | * wdtpci_ioctl: | |
352 | * @inode: inode of the device | |
353 | * @file: file handle to the device | |
354 | * @cmd: watchdog command | |
355 | * @arg: argument pointer | |
356 | * | |
357 | * The watchdog API defines a common set of functions for all watchdogs | |
358 | * according to their available features. We only actually usefully support | |
359 | * querying capabilities and current status. | |
360 | */ | |
361 | ||
362 | static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
363 | unsigned long arg) | |
364 | { | |
365 | int new_heartbeat; | |
366 | int status; | |
367 | void __user *argp = (void __user *)arg; | |
368 | int __user *p = argp; | |
369 | ||
370 | static struct watchdog_info ident = { | |
371 | .options = WDIOF_SETTIMEOUT| | |
372 | WDIOF_MAGICCLOSE| | |
373 | WDIOF_KEEPALIVEPING, | |
374 | .firmware_version = 1, | |
375 | .identity = "PCI-WDT500/501", | |
376 | }; | |
377 | ||
378 | /* Add options according to the card we have */ | |
379 | ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); | |
380 | #ifdef CONFIG_WDT_501_PCI | |
381 | ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); | |
382 | if (tachometer) | |
383 | ident.options |= WDIOF_FANFAULT; | |
384 | #endif /* CONFIG_WDT_501_PCI */ | |
385 | ||
386 | switch(cmd) | |
387 | { | |
388 | default: | |
795b89d2 | 389 | return -ENOTTY; |
1da177e4 LT |
390 | case WDIOC_GETSUPPORT: |
391 | return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0; | |
392 | ||
393 | case WDIOC_GETSTATUS: | |
394 | wdtpci_get_status(&status); | |
395 | return put_user(status, p); | |
396 | case WDIOC_GETBOOTSTATUS: | |
397 | return put_user(0, p); | |
398 | case WDIOC_KEEPALIVE: | |
399 | wdtpci_ping(); | |
400 | return 0; | |
401 | case WDIOC_SETTIMEOUT: | |
402 | if (get_user(new_heartbeat, p)) | |
403 | return -EFAULT; | |
404 | ||
405 | if (wdtpci_set_heartbeat(new_heartbeat)) | |
406 | return -EINVAL; | |
407 | ||
408 | wdtpci_ping(); | |
409 | /* Fall */ | |
410 | case WDIOC_GETTIMEOUT: | |
411 | return put_user(heartbeat, p); | |
412 | } | |
413 | } | |
414 | ||
415 | /** | |
416 | * wdtpci_open: | |
417 | * @inode: inode of device | |
418 | * @file: file handle to device | |
419 | * | |
420 | * The watchdog device has been opened. The watchdog device is single | |
421 | * open and on opening we load the counters. Counter zero is a 100Hz | |
422 | * cascade, into counter 1 which downcounts to reboot. When the counter | |
423 | * triggers counter 2 downcounts the length of the reset pulse which | |
424 | * set set to be as long as possible. | |
425 | */ | |
426 | ||
427 | static int wdtpci_open(struct inode *inode, struct file *file) | |
428 | { | |
429 | if (down_trylock(&open_sem)) | |
430 | return -EBUSY; | |
431 | ||
432 | if (nowayout) { | |
433 | __module_get(THIS_MODULE); | |
434 | } | |
435 | /* | |
436 | * Activate | |
437 | */ | |
438 | wdtpci_start(); | |
439 | return nonseekable_open(inode, file); | |
440 | } | |
441 | ||
442 | /** | |
443 | * wdtpci_release: | |
444 | * @inode: inode to board | |
445 | * @file: file handle to board | |
446 | * | |
447 | * The watchdog has a configurable API. There is a religious dispute | |
448 | * between people who want their watchdog to be able to shut down and | |
449 | * those who want to be sure if the watchdog manager dies the machine | |
450 | * reboots. In the former case we disable the counters, in the latter | |
451 | * case you have to open it again very soon. | |
452 | */ | |
453 | ||
454 | static int wdtpci_release(struct inode *inode, struct file *file) | |
455 | { | |
456 | if (expect_close == 42) { | |
457 | wdtpci_stop(); | |
458 | } else { | |
459 | printk(KERN_CRIT PFX "Unexpected close, not stopping timer!"); | |
460 | wdtpci_ping(); | |
461 | } | |
462 | expect_close = 0; | |
463 | up(&open_sem); | |
464 | return 0; | |
465 | } | |
466 | ||
467 | #ifdef CONFIG_WDT_501_PCI | |
468 | /** | |
469 | * wdtpci_temp_read: | |
470 | * @file: file handle to the watchdog board | |
471 | * @buf: buffer to write 1 byte into | |
472 | * @count: length of buffer | |
473 | * @ptr: offset (no seek allowed) | |
474 | * | |
475 | * Read reports the temperature in degrees Fahrenheit. The API is in | |
476 | * fahrenheit. It was designed by an imperial measurement luddite. | |
477 | */ | |
478 | ||
479 | static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) | |
480 | { | |
481 | int temperature; | |
482 | ||
483 | if (wdtpci_get_temperature(&temperature)) | |
484 | return -EFAULT; | |
485 | ||
486 | if (copy_to_user (buf, &temperature, 1)) | |
487 | return -EFAULT; | |
488 | ||
489 | return 1; | |
490 | } | |
491 | ||
492 | /** | |
493 | * wdtpci_temp_open: | |
494 | * @inode: inode of device | |
495 | * @file: file handle to device | |
496 | * | |
497 | * The temperature device has been opened. | |
498 | */ | |
499 | ||
500 | static int wdtpci_temp_open(struct inode *inode, struct file *file) | |
501 | { | |
502 | return nonseekable_open(inode, file); | |
503 | } | |
504 | ||
505 | /** | |
506 | * wdtpci_temp_release: | |
507 | * @inode: inode to board | |
508 | * @file: file handle to board | |
509 | * | |
510 | * The temperature device has been closed. | |
511 | */ | |
512 | ||
513 | static int wdtpci_temp_release(struct inode *inode, struct file *file) | |
514 | { | |
515 | return 0; | |
516 | } | |
517 | #endif /* CONFIG_WDT_501_PCI */ | |
518 | ||
519 | /** | |
520 | * notify_sys: | |
521 | * @this: our notifier block | |
522 | * @code: the event being reported | |
523 | * @unused: unused | |
524 | * | |
525 | * Our notifier is called on system shutdowns. We want to turn the card | |
526 | * off at reboot otherwise the machine will reboot again during memory | |
527 | * test or worse yet during the following fsck. This would suck, in fact | |
528 | * trust me - if it happens it does suck. | |
529 | */ | |
530 | ||
531 | static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code, | |
532 | void *unused) | |
533 | { | |
534 | if (code==SYS_DOWN || code==SYS_HALT) { | |
535 | /* Turn the card off */ | |
536 | wdtpci_stop(); | |
537 | } | |
538 | return NOTIFY_DONE; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Kernel Interfaces | |
543 | */ | |
544 | ||
545 | ||
62322d25 | 546 | static const struct file_operations wdtpci_fops = { |
1da177e4 LT |
547 | .owner = THIS_MODULE, |
548 | .llseek = no_llseek, | |
549 | .write = wdtpci_write, | |
550 | .ioctl = wdtpci_ioctl, | |
551 | .open = wdtpci_open, | |
552 | .release = wdtpci_release, | |
553 | }; | |
554 | ||
555 | static struct miscdevice wdtpci_miscdev = { | |
556 | .minor = WATCHDOG_MINOR, | |
557 | .name = "watchdog", | |
558 | .fops = &wdtpci_fops, | |
559 | }; | |
560 | ||
561 | #ifdef CONFIG_WDT_501_PCI | |
62322d25 | 562 | static const struct file_operations wdtpci_temp_fops = { |
1da177e4 LT |
563 | .owner = THIS_MODULE, |
564 | .llseek = no_llseek, | |
565 | .read = wdtpci_temp_read, | |
566 | .open = wdtpci_temp_open, | |
567 | .release = wdtpci_temp_release, | |
568 | }; | |
569 | ||
570 | static struct miscdevice temp_miscdev = { | |
571 | .minor = TEMP_MINOR, | |
572 | .name = "temperature", | |
573 | .fops = &wdtpci_temp_fops, | |
574 | }; | |
575 | #endif /* CONFIG_WDT_501_PCI */ | |
576 | ||
577 | /* | |
578 | * The WDT card needs to learn about soft shutdowns in order to | |
579 | * turn the timebomb registers off. | |
580 | */ | |
581 | ||
582 | static struct notifier_block wdtpci_notifier = { | |
583 | .notifier_call = wdtpci_notify_sys, | |
584 | }; | |
585 | ||
586 | ||
587 | static int __devinit wdtpci_init_one (struct pci_dev *dev, | |
588 | const struct pci_device_id *ent) | |
589 | { | |
590 | int ret = -EIO; | |
591 | ||
592 | dev_count++; | |
593 | if (dev_count > 1) { | |
594 | printk (KERN_ERR PFX "this driver only supports 1 device\n"); | |
595 | return -ENODEV; | |
596 | } | |
597 | ||
598 | if (pci_enable_device (dev)) { | |
599 | printk (KERN_ERR PFX "Not possible to enable PCI Device\n"); | |
600 | return -ENODEV; | |
601 | } | |
602 | ||
603 | if (pci_resource_start (dev, 2) == 0x0000) { | |
604 | printk (KERN_ERR PFX "No I/O-Address for card detected\n"); | |
605 | ret = -ENODEV; | |
606 | goto out_pci; | |
607 | } | |
608 | ||
609 | sema_init(&open_sem, 1); | |
1da177e4 LT |
610 | |
611 | irq = dev->irq; | |
612 | io = pci_resource_start (dev, 2); | |
613 | ||
614 | if (request_region (io, 16, "wdt_pci") == NULL) { | |
615 | printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", io); | |
616 | goto out_pci; | |
617 | } | |
618 | ||
0f2ed4c6 | 619 | if (request_irq (irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED, |
1da177e4 LT |
620 | "wdt_pci", &wdtpci_miscdev)) { |
621 | printk (KERN_ERR PFX "IRQ %d is not free\n", irq); | |
622 | goto out_reg; | |
623 | } | |
624 | ||
625 | printk ("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n", | |
626 | io, irq); | |
627 | ||
628 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
629 | if (wdtpci_set_heartbeat(heartbeat)) { | |
630 | wdtpci_set_heartbeat(WD_TIMO); | |
631 | printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", | |
632 | WD_TIMO); | |
633 | } | |
634 | ||
635 | ret = register_reboot_notifier (&wdtpci_notifier); | |
636 | if (ret) { | |
637 | printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", ret); | |
638 | goto out_irq; | |
639 | } | |
640 | ||
641 | #ifdef CONFIG_WDT_501_PCI | |
642 | ret = misc_register (&temp_miscdev); | |
643 | if (ret) { | |
644 | printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
645 | TEMP_MINOR, ret); | |
646 | goto out_rbt; | |
647 | } | |
648 | #endif /* CONFIG_WDT_501_PCI */ | |
649 | ||
650 | ret = misc_register (&wdtpci_miscdev); | |
651 | if (ret) { | |
652 | printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
653 | WATCHDOG_MINOR, ret); | |
654 | goto out_misc; | |
655 | } | |
656 | ||
657 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
658 | heartbeat, nowayout); | |
659 | #ifdef CONFIG_WDT_501_PCI | |
660 | printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled")); | |
661 | #endif /* CONFIG_WDT_501_PCI */ | |
662 | ||
663 | ret = 0; | |
664 | out: | |
665 | return ret; | |
666 | ||
667 | out_misc: | |
668 | #ifdef CONFIG_WDT_501_PCI | |
669 | misc_deregister(&temp_miscdev); | |
670 | out_rbt: | |
671 | #endif /* CONFIG_WDT_501_PCI */ | |
672 | unregister_reboot_notifier(&wdtpci_notifier); | |
673 | out_irq: | |
674 | free_irq(irq, &wdtpci_miscdev); | |
675 | out_reg: | |
676 | release_region (io, 16); | |
677 | out_pci: | |
678 | pci_disable_device(dev); | |
679 | goto out; | |
680 | } | |
681 | ||
682 | ||
683 | static void __devexit wdtpci_remove_one (struct pci_dev *pdev) | |
684 | { | |
685 | /* here we assume only one device will ever have | |
686 | * been picked up and registered by probe function */ | |
687 | misc_deregister(&wdtpci_miscdev); | |
688 | #ifdef CONFIG_WDT_501_PCI | |
689 | misc_deregister(&temp_miscdev); | |
690 | #endif /* CONFIG_WDT_501_PCI */ | |
691 | unregister_reboot_notifier(&wdtpci_notifier); | |
692 | free_irq(irq, &wdtpci_miscdev); | |
693 | release_region(io, 16); | |
694 | pci_disable_device(pdev); | |
695 | dev_count--; | |
696 | } | |
697 | ||
698 | ||
699 | static struct pci_device_id wdtpci_pci_tbl[] = { | |
700 | { | |
701 | .vendor = PCI_VENDOR_ID_ACCESSIO, | |
702 | .device = PCI_DEVICE_ID_WDG_CSM, | |
703 | .subvendor = PCI_ANY_ID, | |
704 | .subdevice = PCI_ANY_ID, | |
705 | }, | |
706 | { 0, }, /* terminate list */ | |
707 | }; | |
708 | MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl); | |
709 | ||
710 | ||
711 | static struct pci_driver wdtpci_driver = { | |
712 | .name = "wdt_pci", | |
713 | .id_table = wdtpci_pci_tbl, | |
714 | .probe = wdtpci_init_one, | |
715 | .remove = __devexit_p(wdtpci_remove_one), | |
716 | }; | |
717 | ||
718 | ||
719 | /** | |
720 | * wdtpci_cleanup: | |
721 | * | |
722 | * Unload the watchdog. You cannot do this with any file handles open. | |
723 | * If your watchdog is set to continue ticking on close and you unload | |
724 | * it, well it keeps ticking. We won't get the interrupt but the board | |
725 | * will not touch PC memory so all is fine. You just have to load a new | |
726 | * module in xx seconds or reboot. | |
727 | */ | |
728 | ||
729 | static void __exit wdtpci_cleanup(void) | |
730 | { | |
731 | pci_unregister_driver (&wdtpci_driver); | |
732 | } | |
733 | ||
734 | ||
735 | /** | |
736 | * wdtpci_init: | |
737 | * | |
738 | * Set up the WDT watchdog board. All we have to do is grab the | |
739 | * resources we require and bitch if anyone beat us to them. | |
740 | * The open() function will actually kick the board off. | |
741 | */ | |
742 | ||
743 | static int __init wdtpci_init(void) | |
744 | { | |
745 | return pci_register_driver (&wdtpci_driver); | |
746 | } | |
747 | ||
748 | ||
749 | module_init(wdtpci_init); | |
750 | module_exit(wdtpci_cleanup); | |
751 | ||
752 | MODULE_AUTHOR("JP Nollmann, Alan Cox"); | |
753 | MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards"); | |
754 | MODULE_LICENSE("GPL"); | |
755 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
756 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |