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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 | ||
38 | #include <linux/config.h> | |
39 | #include <linux/interrupt.h> | |
40 | #include <linux/module.h> | |
41 | #include <linux/moduleparam.h> | |
42 | #include <linux/types.h> | |
43 | #include <linux/miscdevice.h> | |
44 | #include <linux/watchdog.h> | |
45 | #include <linux/ioport.h> | |
46 | #include <linux/notifier.h> | |
47 | #include <linux/reboot.h> | |
48 | #include <linux/init.h> | |
49 | #include <linux/fs.h> | |
50 | #include <linux/pci.h> | |
51 | ||
52 | #include <asm/io.h> | |
53 | #include <asm/uaccess.h> | |
54 | #include <asm/system.h> | |
55 | ||
56 | #define WDT_IS_PCI | |
57 | #include "wd501p.h" | |
58 | ||
59 | #define PFX "wdt_pci: " | |
60 | ||
61 | /* | |
62 | * Until Access I/O gets their application for a PCI vendor ID approved, | |
63 | * I don't think that it's appropriate to move these constants into the | |
64 | * regular pci_ids.h file. -- JPN 2000/01/18 | |
65 | */ | |
66 | ||
67 | #ifndef PCI_VENDOR_ID_ACCESSIO | |
68 | #define PCI_VENDOR_ID_ACCESSIO 0x494f | |
69 | #endif | |
70 | #ifndef PCI_DEVICE_ID_WDG_CSM | |
71 | #define PCI_DEVICE_ID_WDG_CSM 0x22c0 | |
72 | #endif | |
73 | ||
74 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
75 | static int dev_count; | |
76 | ||
77 | static struct semaphore open_sem; | |
78 | static spinlock_t wdtpci_lock; | |
79 | static char expect_close; | |
80 | ||
81 | static int io; | |
82 | static int irq; | |
83 | ||
84 | /* Default timeout */ | |
85 | #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ | |
86 | ||
87 | static int heartbeat = WD_TIMO; | |
88 | static int wd_heartbeat; | |
89 | module_param(heartbeat, int, 0); | |
90 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")"); | |
91 | ||
92 | #ifdef CONFIG_WATCHDOG_NOWAYOUT | |
93 | static int nowayout = 1; | |
94 | #else | |
95 | static int nowayout = 0; | |
96 | #endif | |
97 | ||
98 | module_param(nowayout, int, 0); | |
99 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)"); | |
100 | ||
101 | #ifdef CONFIG_WDT_501_PCI | |
102 | /* Support for the Fan Tachometer on the PCI-WDT501 */ | |
103 | static int tachometer; | |
104 | ||
105 | module_param(tachometer, int, 0); | |
106 | MODULE_PARM_DESC(tachometer, "PCI-WDT501 Fan Tachometer support (0=disable, default=0)"); | |
107 | #endif /* CONFIG_WDT_501_PCI */ | |
108 | ||
109 | /* | |
110 | * Programming support | |
111 | */ | |
112 | ||
113 | static void wdtpci_ctr_mode(int ctr, int mode) | |
114 | { | |
115 | ctr<<=6; | |
116 | ctr|=0x30; | |
117 | ctr|=(mode<<1); | |
118 | outb_p(ctr, WDT_CR); | |
119 | } | |
120 | ||
121 | static void wdtpci_ctr_load(int ctr, int val) | |
122 | { | |
123 | outb_p(val&0xFF, WDT_COUNT0+ctr); | |
124 | outb_p(val>>8, WDT_COUNT0+ctr); | |
125 | } | |
126 | ||
127 | /** | |
128 | * wdtpci_start: | |
129 | * | |
130 | * Start the watchdog driver. | |
131 | */ | |
132 | ||
133 | static int wdtpci_start(void) | |
134 | { | |
135 | unsigned long flags; | |
136 | ||
137 | spin_lock_irqsave(&wdtpci_lock, flags); | |
138 | ||
139 | /* | |
140 | * "pet" the watchdog, as Access says. | |
141 | * This resets the clock outputs. | |
142 | */ | |
143 | inb_p(WDT_DC); /* Disable watchdog */ | |
144 | wdtpci_ctr_mode(2,0); /* Program CTR2 for Mode 0: Pulse on Terminal Count */ | |
145 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
146 | ||
147 | inb_p(WDT_DC); /* Disable watchdog */ | |
148 | outb_p(0, WDT_CLOCK); /* 2.0833MHz clock */ | |
149 | inb_p(WDT_BUZZER); /* disable */ | |
150 | inb_p(WDT_OPTONOTRST); /* disable */ | |
151 | inb_p(WDT_OPTORST); /* disable */ | |
152 | inb_p(WDT_PROGOUT); /* disable */ | |
153 | wdtpci_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */ | |
154 | wdtpci_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */ | |
155 | wdtpci_ctr_mode(2,1); /* Program CTR2 for Mode 1: Retriggerable One-Shot */ | |
156 | wdtpci_ctr_load(0,20833); /* count at 100Hz */ | |
157 | wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */ | |
158 | /* DO NOT LOAD CTR2 on PCI card! -- JPN */ | |
159 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
160 | ||
161 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
162 | return 0; | |
163 | } | |
164 | ||
165 | /** | |
166 | * wdtpci_stop: | |
167 | * | |
168 | * Stop the watchdog driver. | |
169 | */ | |
170 | ||
171 | static int wdtpci_stop (void) | |
172 | { | |
173 | unsigned long flags; | |
174 | ||
175 | /* Turn the card off */ | |
176 | spin_lock_irqsave(&wdtpci_lock, flags); | |
177 | inb_p(WDT_DC); /* Disable watchdog */ | |
178 | wdtpci_ctr_load(2,0); /* 0 length reset pulses now */ | |
179 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | /** | |
184 | * wdtpci_ping: | |
185 | * | |
186 | * Reload counter one with the watchdog heartbeat. We don't bother reloading | |
187 | * the cascade counter. | |
188 | */ | |
189 | ||
190 | static int wdtpci_ping(void) | |
191 | { | |
192 | unsigned long flags; | |
193 | ||
194 | /* Write a watchdog value */ | |
195 | spin_lock_irqsave(&wdtpci_lock, flags); | |
196 | inb_p(WDT_DC); /* Disable watchdog */ | |
197 | wdtpci_ctr_mode(1,2); /* Re-Program CTR1 for Mode 2: Rate Generator */ | |
198 | wdtpci_ctr_load(1,wd_heartbeat);/* Heartbeat */ | |
199 | outb_p(0, WDT_DC); /* Enable watchdog */ | |
200 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | /** | |
205 | * wdtpci_set_heartbeat: | |
206 | * @t: the new heartbeat value that needs to be set. | |
207 | * | |
208 | * Set a new heartbeat value for the watchdog device. If the heartbeat value is | |
209 | * incorrect we keep the old value and return -EINVAL. If successfull we | |
210 | * return 0. | |
211 | */ | |
212 | static int wdtpci_set_heartbeat(int t) | |
213 | { | |
214 | /* Arbitrary, can't find the card's limits */ | |
215 | if ((t < 1) || (t > 65535)) | |
216 | return -EINVAL; | |
217 | ||
218 | heartbeat = t; | |
219 | wd_heartbeat = t * 100; | |
220 | return 0; | |
221 | } | |
222 | ||
223 | /** | |
224 | * wdtpci_get_status: | |
225 | * @status: the new status. | |
226 | * | |
227 | * Extract the status information from a WDT watchdog device. There are | |
228 | * several board variants so we have to know which bits are valid. Some | |
229 | * bits default to one and some to zero in order to be maximally painful. | |
230 | * | |
231 | * we then map the bits onto the status ioctl flags. | |
232 | */ | |
233 | ||
234 | static int wdtpci_get_status(int *status) | |
235 | { | |
236 | unsigned char new_status=inb_p(WDT_SR); | |
237 | ||
238 | *status=0; | |
239 | if (new_status & WDC_SR_ISOI0) | |
240 | *status |= WDIOF_EXTERN1; | |
241 | if (new_status & WDC_SR_ISII1) | |
242 | *status |= WDIOF_EXTERN2; | |
243 | #ifdef CONFIG_WDT_501_PCI | |
244 | if (!(new_status & WDC_SR_TGOOD)) | |
245 | *status |= WDIOF_OVERHEAT; | |
246 | if (!(new_status & WDC_SR_PSUOVER)) | |
247 | *status |= WDIOF_POWEROVER; | |
248 | if (!(new_status & WDC_SR_PSUUNDR)) | |
249 | *status |= WDIOF_POWERUNDER; | |
250 | if (tachometer) { | |
251 | if (!(new_status & WDC_SR_FANGOOD)) | |
252 | *status |= WDIOF_FANFAULT; | |
253 | } | |
254 | #endif /* CONFIG_WDT_501_PCI */ | |
255 | return 0; | |
256 | } | |
257 | ||
258 | #ifdef CONFIG_WDT_501_PCI | |
259 | /** | |
260 | * wdtpci_get_temperature: | |
261 | * | |
262 | * Reports the temperature in degrees Fahrenheit. The API is in | |
263 | * farenheit. It was designed by an imperial measurement luddite. | |
264 | */ | |
265 | ||
266 | static int wdtpci_get_temperature(int *temperature) | |
267 | { | |
268 | unsigned short c=inb_p(WDT_RT); | |
269 | ||
270 | *temperature = (c * 11 / 15) + 7; | |
271 | return 0; | |
272 | } | |
273 | #endif /* CONFIG_WDT_501_PCI */ | |
274 | ||
275 | /** | |
276 | * wdtpci_interrupt: | |
277 | * @irq: Interrupt number | |
278 | * @dev_id: Unused as we don't allow multiple devices. | |
279 | * @regs: Unused. | |
280 | * | |
281 | * Handle an interrupt from the board. These are raised when the status | |
282 | * map changes in what the board considers an interesting way. That means | |
283 | * a failure condition occurring. | |
284 | */ | |
285 | ||
286 | static irqreturn_t wdtpci_interrupt(int irq, void *dev_id, struct pt_regs *regs) | |
287 | { | |
288 | /* | |
289 | * Read the status register see what is up and | |
290 | * then printk it. | |
291 | */ | |
292 | unsigned char status=inb_p(WDT_SR); | |
293 | ||
294 | printk(KERN_CRIT PFX "status %d\n", status); | |
295 | ||
296 | #ifdef CONFIG_WDT_501_PCI | |
297 | if (!(status & WDC_SR_TGOOD)) | |
298 | printk(KERN_CRIT PFX "Overheat alarm.(%d)\n",inb_p(WDT_RT)); | |
299 | if (!(status & WDC_SR_PSUOVER)) | |
300 | printk(KERN_CRIT PFX "PSU over voltage.\n"); | |
301 | if (!(status & WDC_SR_PSUUNDR)) | |
302 | printk(KERN_CRIT PFX "PSU under voltage.\n"); | |
303 | if (tachometer) { | |
304 | if (!(status & WDC_SR_FANGOOD)) | |
305 | printk(KERN_CRIT PFX "Possible fan fault.\n"); | |
306 | } | |
307 | #endif /* CONFIG_WDT_501_PCI */ | |
308 | if (!(status&WDC_SR_WCCR)) | |
309 | #ifdef SOFTWARE_REBOOT | |
310 | #ifdef ONLY_TESTING | |
311 | printk(KERN_CRIT PFX "Would Reboot.\n"); | |
312 | #else | |
313 | printk(KERN_CRIT PFX "Initiating system reboot.\n"); | |
314 | machine_restart(NULL); | |
315 | #endif | |
316 | #else | |
317 | printk(KERN_CRIT PFX "Reset in 5ms.\n"); | |
318 | #endif | |
319 | return IRQ_HANDLED; | |
320 | } | |
321 | ||
322 | ||
323 | /** | |
324 | * wdtpci_write: | |
325 | * @file: file handle to the watchdog | |
326 | * @buf: buffer to write (unused as data does not matter here | |
327 | * @count: count of bytes | |
328 | * @ppos: pointer to the position to write. No seeks allowed | |
329 | * | |
330 | * A write to a watchdog device is defined as a keepalive signal. Any | |
331 | * write of data will do, as we we don't define content meaning. | |
332 | */ | |
333 | ||
334 | static ssize_t wdtpci_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
335 | { | |
336 | if (count) { | |
337 | if (!nowayout) { | |
338 | size_t i; | |
339 | ||
340 | expect_close = 0; | |
341 | ||
342 | for (i = 0; i != count; i++) { | |
343 | char c; | |
344 | if(get_user(c, buf+i)) | |
345 | return -EFAULT; | |
346 | if (c == 'V') | |
347 | expect_close = 42; | |
348 | } | |
349 | } | |
350 | wdtpci_ping(); | |
351 | } | |
352 | ||
353 | return count; | |
354 | } | |
355 | ||
356 | /** | |
357 | * wdtpci_ioctl: | |
358 | * @inode: inode of the device | |
359 | * @file: file handle to the device | |
360 | * @cmd: watchdog command | |
361 | * @arg: argument pointer | |
362 | * | |
363 | * The watchdog API defines a common set of functions for all watchdogs | |
364 | * according to their available features. We only actually usefully support | |
365 | * querying capabilities and current status. | |
366 | */ | |
367 | ||
368 | static int wdtpci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, | |
369 | unsigned long arg) | |
370 | { | |
371 | int new_heartbeat; | |
372 | int status; | |
373 | void __user *argp = (void __user *)arg; | |
374 | int __user *p = argp; | |
375 | ||
376 | static struct watchdog_info ident = { | |
377 | .options = WDIOF_SETTIMEOUT| | |
378 | WDIOF_MAGICCLOSE| | |
379 | WDIOF_KEEPALIVEPING, | |
380 | .firmware_version = 1, | |
381 | .identity = "PCI-WDT500/501", | |
382 | }; | |
383 | ||
384 | /* Add options according to the card we have */ | |
385 | ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); | |
386 | #ifdef CONFIG_WDT_501_PCI | |
387 | ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); | |
388 | if (tachometer) | |
389 | ident.options |= WDIOF_FANFAULT; | |
390 | #endif /* CONFIG_WDT_501_PCI */ | |
391 | ||
392 | switch(cmd) | |
393 | { | |
394 | default: | |
395 | return -ENOIOCTLCMD; | |
396 | case WDIOC_GETSUPPORT: | |
397 | return copy_to_user(argp, &ident, sizeof(ident))?-EFAULT:0; | |
398 | ||
399 | case WDIOC_GETSTATUS: | |
400 | wdtpci_get_status(&status); | |
401 | return put_user(status, p); | |
402 | case WDIOC_GETBOOTSTATUS: | |
403 | return put_user(0, p); | |
404 | case WDIOC_KEEPALIVE: | |
405 | wdtpci_ping(); | |
406 | return 0; | |
407 | case WDIOC_SETTIMEOUT: | |
408 | if (get_user(new_heartbeat, p)) | |
409 | return -EFAULT; | |
410 | ||
411 | if (wdtpci_set_heartbeat(new_heartbeat)) | |
412 | return -EINVAL; | |
413 | ||
414 | wdtpci_ping(); | |
415 | /* Fall */ | |
416 | case WDIOC_GETTIMEOUT: | |
417 | return put_user(heartbeat, p); | |
418 | } | |
419 | } | |
420 | ||
421 | /** | |
422 | * wdtpci_open: | |
423 | * @inode: inode of device | |
424 | * @file: file handle to device | |
425 | * | |
426 | * The watchdog device has been opened. The watchdog device is single | |
427 | * open and on opening we load the counters. Counter zero is a 100Hz | |
428 | * cascade, into counter 1 which downcounts to reboot. When the counter | |
429 | * triggers counter 2 downcounts the length of the reset pulse which | |
430 | * set set to be as long as possible. | |
431 | */ | |
432 | ||
433 | static int wdtpci_open(struct inode *inode, struct file *file) | |
434 | { | |
435 | if (down_trylock(&open_sem)) | |
436 | return -EBUSY; | |
437 | ||
438 | if (nowayout) { | |
439 | __module_get(THIS_MODULE); | |
440 | } | |
441 | /* | |
442 | * Activate | |
443 | */ | |
444 | wdtpci_start(); | |
445 | return nonseekable_open(inode, file); | |
446 | } | |
447 | ||
448 | /** | |
449 | * wdtpci_release: | |
450 | * @inode: inode to board | |
451 | * @file: file handle to board | |
452 | * | |
453 | * The watchdog has a configurable API. There is a religious dispute | |
454 | * between people who want their watchdog to be able to shut down and | |
455 | * those who want to be sure if the watchdog manager dies the machine | |
456 | * reboots. In the former case we disable the counters, in the latter | |
457 | * case you have to open it again very soon. | |
458 | */ | |
459 | ||
460 | static int wdtpci_release(struct inode *inode, struct file *file) | |
461 | { | |
462 | if (expect_close == 42) { | |
463 | wdtpci_stop(); | |
464 | } else { | |
465 | printk(KERN_CRIT PFX "Unexpected close, not stopping timer!"); | |
466 | wdtpci_ping(); | |
467 | } | |
468 | expect_close = 0; | |
469 | up(&open_sem); | |
470 | return 0; | |
471 | } | |
472 | ||
473 | #ifdef CONFIG_WDT_501_PCI | |
474 | /** | |
475 | * wdtpci_temp_read: | |
476 | * @file: file handle to the watchdog board | |
477 | * @buf: buffer to write 1 byte into | |
478 | * @count: length of buffer | |
479 | * @ptr: offset (no seek allowed) | |
480 | * | |
481 | * Read reports the temperature in degrees Fahrenheit. The API is in | |
482 | * fahrenheit. It was designed by an imperial measurement luddite. | |
483 | */ | |
484 | ||
485 | static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, size_t count, loff_t *ptr) | |
486 | { | |
487 | int temperature; | |
488 | ||
489 | if (wdtpci_get_temperature(&temperature)) | |
490 | return -EFAULT; | |
491 | ||
492 | if (copy_to_user (buf, &temperature, 1)) | |
493 | return -EFAULT; | |
494 | ||
495 | return 1; | |
496 | } | |
497 | ||
498 | /** | |
499 | * wdtpci_temp_open: | |
500 | * @inode: inode of device | |
501 | * @file: file handle to device | |
502 | * | |
503 | * The temperature device has been opened. | |
504 | */ | |
505 | ||
506 | static int wdtpci_temp_open(struct inode *inode, struct file *file) | |
507 | { | |
508 | return nonseekable_open(inode, file); | |
509 | } | |
510 | ||
511 | /** | |
512 | * wdtpci_temp_release: | |
513 | * @inode: inode to board | |
514 | * @file: file handle to board | |
515 | * | |
516 | * The temperature device has been closed. | |
517 | */ | |
518 | ||
519 | static int wdtpci_temp_release(struct inode *inode, struct file *file) | |
520 | { | |
521 | return 0; | |
522 | } | |
523 | #endif /* CONFIG_WDT_501_PCI */ | |
524 | ||
525 | /** | |
526 | * notify_sys: | |
527 | * @this: our notifier block | |
528 | * @code: the event being reported | |
529 | * @unused: unused | |
530 | * | |
531 | * Our notifier is called on system shutdowns. We want to turn the card | |
532 | * off at reboot otherwise the machine will reboot again during memory | |
533 | * test or worse yet during the following fsck. This would suck, in fact | |
534 | * trust me - if it happens it does suck. | |
535 | */ | |
536 | ||
537 | static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code, | |
538 | void *unused) | |
539 | { | |
540 | if (code==SYS_DOWN || code==SYS_HALT) { | |
541 | /* Turn the card off */ | |
542 | wdtpci_stop(); | |
543 | } | |
544 | return NOTIFY_DONE; | |
545 | } | |
546 | ||
547 | /* | |
548 | * Kernel Interfaces | |
549 | */ | |
550 | ||
551 | ||
552 | static struct file_operations wdtpci_fops = { | |
553 | .owner = THIS_MODULE, | |
554 | .llseek = no_llseek, | |
555 | .write = wdtpci_write, | |
556 | .ioctl = wdtpci_ioctl, | |
557 | .open = wdtpci_open, | |
558 | .release = wdtpci_release, | |
559 | }; | |
560 | ||
561 | static struct miscdevice wdtpci_miscdev = { | |
562 | .minor = WATCHDOG_MINOR, | |
563 | .name = "watchdog", | |
564 | .fops = &wdtpci_fops, | |
565 | }; | |
566 | ||
567 | #ifdef CONFIG_WDT_501_PCI | |
568 | static struct file_operations wdtpci_temp_fops = { | |
569 | .owner = THIS_MODULE, | |
570 | .llseek = no_llseek, | |
571 | .read = wdtpci_temp_read, | |
572 | .open = wdtpci_temp_open, | |
573 | .release = wdtpci_temp_release, | |
574 | }; | |
575 | ||
576 | static struct miscdevice temp_miscdev = { | |
577 | .minor = TEMP_MINOR, | |
578 | .name = "temperature", | |
579 | .fops = &wdtpci_temp_fops, | |
580 | }; | |
581 | #endif /* CONFIG_WDT_501_PCI */ | |
582 | ||
583 | /* | |
584 | * The WDT card needs to learn about soft shutdowns in order to | |
585 | * turn the timebomb registers off. | |
586 | */ | |
587 | ||
588 | static struct notifier_block wdtpci_notifier = { | |
589 | .notifier_call = wdtpci_notify_sys, | |
590 | }; | |
591 | ||
592 | ||
593 | static int __devinit wdtpci_init_one (struct pci_dev *dev, | |
594 | const struct pci_device_id *ent) | |
595 | { | |
596 | int ret = -EIO; | |
597 | ||
598 | dev_count++; | |
599 | if (dev_count > 1) { | |
600 | printk (KERN_ERR PFX "this driver only supports 1 device\n"); | |
601 | return -ENODEV; | |
602 | } | |
603 | ||
604 | if (pci_enable_device (dev)) { | |
605 | printk (KERN_ERR PFX "Not possible to enable PCI Device\n"); | |
606 | return -ENODEV; | |
607 | } | |
608 | ||
609 | if (pci_resource_start (dev, 2) == 0x0000) { | |
610 | printk (KERN_ERR PFX "No I/O-Address for card detected\n"); | |
611 | ret = -ENODEV; | |
612 | goto out_pci; | |
613 | } | |
614 | ||
615 | sema_init(&open_sem, 1); | |
616 | spin_lock_init(&wdtpci_lock); | |
617 | ||
618 | irq = dev->irq; | |
619 | io = pci_resource_start (dev, 2); | |
620 | ||
621 | if (request_region (io, 16, "wdt_pci") == NULL) { | |
622 | printk (KERN_ERR PFX "I/O address 0x%04x already in use\n", io); | |
623 | goto out_pci; | |
624 | } | |
625 | ||
626 | if (request_irq (irq, wdtpci_interrupt, SA_INTERRUPT | SA_SHIRQ, | |
627 | "wdt_pci", &wdtpci_miscdev)) { | |
628 | printk (KERN_ERR PFX "IRQ %d is not free\n", irq); | |
629 | goto out_reg; | |
630 | } | |
631 | ||
632 | printk ("PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n", | |
633 | io, irq); | |
634 | ||
635 | /* Check that the heartbeat value is within it's range ; if not reset to the default */ | |
636 | if (wdtpci_set_heartbeat(heartbeat)) { | |
637 | wdtpci_set_heartbeat(WD_TIMO); | |
638 | printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n", | |
639 | WD_TIMO); | |
640 | } | |
641 | ||
642 | ret = register_reboot_notifier (&wdtpci_notifier); | |
643 | if (ret) { | |
644 | printk (KERN_ERR PFX "cannot register reboot notifier (err=%d)\n", ret); | |
645 | goto out_irq; | |
646 | } | |
647 | ||
648 | #ifdef CONFIG_WDT_501_PCI | |
649 | ret = misc_register (&temp_miscdev); | |
650 | if (ret) { | |
651 | printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
652 | TEMP_MINOR, ret); | |
653 | goto out_rbt; | |
654 | } | |
655 | #endif /* CONFIG_WDT_501_PCI */ | |
656 | ||
657 | ret = misc_register (&wdtpci_miscdev); | |
658 | if (ret) { | |
659 | printk (KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n", | |
660 | WATCHDOG_MINOR, ret); | |
661 | goto out_misc; | |
662 | } | |
663 | ||
664 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
665 | heartbeat, nowayout); | |
666 | #ifdef CONFIG_WDT_501_PCI | |
667 | printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled")); | |
668 | #endif /* CONFIG_WDT_501_PCI */ | |
669 | ||
670 | ret = 0; | |
671 | out: | |
672 | return ret; | |
673 | ||
674 | out_misc: | |
675 | #ifdef CONFIG_WDT_501_PCI | |
676 | misc_deregister(&temp_miscdev); | |
677 | out_rbt: | |
678 | #endif /* CONFIG_WDT_501_PCI */ | |
679 | unregister_reboot_notifier(&wdtpci_notifier); | |
680 | out_irq: | |
681 | free_irq(irq, &wdtpci_miscdev); | |
682 | out_reg: | |
683 | release_region (io, 16); | |
684 | out_pci: | |
685 | pci_disable_device(dev); | |
686 | goto out; | |
687 | } | |
688 | ||
689 | ||
690 | static void __devexit wdtpci_remove_one (struct pci_dev *pdev) | |
691 | { | |
692 | /* here we assume only one device will ever have | |
693 | * been picked up and registered by probe function */ | |
694 | misc_deregister(&wdtpci_miscdev); | |
695 | #ifdef CONFIG_WDT_501_PCI | |
696 | misc_deregister(&temp_miscdev); | |
697 | #endif /* CONFIG_WDT_501_PCI */ | |
698 | unregister_reboot_notifier(&wdtpci_notifier); | |
699 | free_irq(irq, &wdtpci_miscdev); | |
700 | release_region(io, 16); | |
701 | pci_disable_device(pdev); | |
702 | dev_count--; | |
703 | } | |
704 | ||
705 | ||
706 | static struct pci_device_id wdtpci_pci_tbl[] = { | |
707 | { | |
708 | .vendor = PCI_VENDOR_ID_ACCESSIO, | |
709 | .device = PCI_DEVICE_ID_WDG_CSM, | |
710 | .subvendor = PCI_ANY_ID, | |
711 | .subdevice = PCI_ANY_ID, | |
712 | }, | |
713 | { 0, }, /* terminate list */ | |
714 | }; | |
715 | MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl); | |
716 | ||
717 | ||
718 | static struct pci_driver wdtpci_driver = { | |
719 | .name = "wdt_pci", | |
720 | .id_table = wdtpci_pci_tbl, | |
721 | .probe = wdtpci_init_one, | |
722 | .remove = __devexit_p(wdtpci_remove_one), | |
723 | }; | |
724 | ||
725 | ||
726 | /** | |
727 | * wdtpci_cleanup: | |
728 | * | |
729 | * Unload the watchdog. You cannot do this with any file handles open. | |
730 | * If your watchdog is set to continue ticking on close and you unload | |
731 | * it, well it keeps ticking. We won't get the interrupt but the board | |
732 | * will not touch PC memory so all is fine. You just have to load a new | |
733 | * module in xx seconds or reboot. | |
734 | */ | |
735 | ||
736 | static void __exit wdtpci_cleanup(void) | |
737 | { | |
738 | pci_unregister_driver (&wdtpci_driver); | |
739 | } | |
740 | ||
741 | ||
742 | /** | |
743 | * wdtpci_init: | |
744 | * | |
745 | * Set up the WDT watchdog board. All we have to do is grab the | |
746 | * resources we require and bitch if anyone beat us to them. | |
747 | * The open() function will actually kick the board off. | |
748 | */ | |
749 | ||
750 | static int __init wdtpci_init(void) | |
751 | { | |
752 | return pci_register_driver (&wdtpci_driver); | |
753 | } | |
754 | ||
755 | ||
756 | module_init(wdtpci_init); | |
757 | module_exit(wdtpci_cleanup); | |
758 | ||
759 | MODULE_AUTHOR("JP Nollmann, Alan Cox"); | |
760 | MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards"); | |
761 | MODULE_LICENSE("GPL"); | |
762 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
763 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |