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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 | |
9f2d1f0d AC |
32 | * Tigran Aivazian : Restructured wdtpci_init_one() to handle |
33 | * failures | |
1da177e4 | 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 | ||
1da177e4 LT |
40 | #include <linux/interrupt.h> |
41 | #include <linux/module.h> | |
42 | #include <linux/moduleparam.h> | |
43 | #include <linux/types.h> | |
44 | #include <linux/miscdevice.h> | |
45 | #include <linux/watchdog.h> | |
46 | #include <linux/ioport.h> | |
47 | #include <linux/notifier.h> | |
48 | #include <linux/reboot.h> | |
49 | #include <linux/init.h> | |
50 | #include <linux/fs.h> | |
51 | #include <linux/pci.h> | |
9f2d1f0d AC |
52 | #include <linux/io.h> |
53 | #include <linux/uaccess.h> | |
1da177e4 | 54 | |
1da177e4 LT |
55 | #include <asm/system.h> |
56 | ||
57 | #define WDT_IS_PCI | |
58 | #include "wd501p.h" | |
59 | ||
60 | #define PFX "wdt_pci: " | |
61 | ||
62 | /* | |
63 | * Until Access I/O gets their application for a PCI vendor ID approved, | |
64 | * I don't think that it's appropriate to move these constants into the | |
65 | * regular pci_ids.h file. -- JPN 2000/01/18 | |
66 | */ | |
67 | ||
68 | #ifndef PCI_VENDOR_ID_ACCESSIO | |
69 | #define PCI_VENDOR_ID_ACCESSIO 0x494f | |
70 | #endif | |
71 | #ifndef PCI_DEVICE_ID_WDG_CSM | |
72 | #define PCI_DEVICE_ID_WDG_CSM 0x22c0 | |
73 | #endif | |
74 | ||
75 | /* We can only use 1 card due to the /dev/watchdog restriction */ | |
76 | static int dev_count; | |
77 | ||
9f2d1f0d | 78 | static unsigned long open_lock; |
c7dfd0cc | 79 | static DEFINE_SPINLOCK(wdtpci_lock); |
1da177e4 LT |
80 | static char expect_close; |
81 | ||
82 | static int io; | |
83 | static int irq; | |
84 | ||
85 | /* Default timeout */ | |
86 | #define WD_TIMO 60 /* Default heartbeat = 60 seconds */ | |
87 | ||
88 | static int heartbeat = WD_TIMO; | |
89 | static int wd_heartbeat; | |
90 | module_param(heartbeat, int, 0); | |
9f2d1f0d AC |
91 | MODULE_PARM_DESC(heartbeat, |
92 | "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" | |
93 | __MODULE_STRING(WD_TIMO) ")"); | |
1da177e4 | 94 | |
4bfdf378 | 95 | static int nowayout = WATCHDOG_NOWAYOUT; |
1da177e4 | 96 | module_param(nowayout, int, 0); |
9f2d1f0d AC |
97 | MODULE_PARM_DESC(nowayout, |
98 | "Watchdog cannot be stopped once started (default=" | |
99 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); | |
1da177e4 LT |
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); | |
9f2d1f0d AC |
106 | MODULE_PARM_DESC(tachometer, |
107 | "PCI-WDT501 Fan Tachometer support (0=disable, default=0)"); | |
1da177e4 LT |
108 | #endif /* CONFIG_WDT_501_PCI */ |
109 | ||
110 | /* | |
111 | * Programming support | |
112 | */ | |
113 | ||
114 | static void wdtpci_ctr_mode(int ctr, int mode) | |
115 | { | |
9f2d1f0d AC |
116 | ctr <<= 6; |
117 | ctr |= 0x30; | |
118 | ctr |= (mode << 1); | |
119 | outb(ctr, WDT_CR); | |
120 | udelay(8); | |
1da177e4 LT |
121 | } |
122 | ||
123 | static void wdtpci_ctr_load(int ctr, int val) | |
124 | { | |
9f2d1f0d AC |
125 | outb(val & 0xFF, WDT_COUNT0 + ctr); |
126 | udelay(8); | |
127 | outb(val >> 8, WDT_COUNT0 + ctr); | |
128 | udelay(8); | |
1da177e4 LT |
129 | } |
130 | ||
131 | /** | |
132 | * wdtpci_start: | |
133 | * | |
134 | * Start the watchdog driver. | |
135 | */ | |
136 | ||
137 | static int wdtpci_start(void) | |
138 | { | |
139 | unsigned long flags; | |
140 | ||
141 | spin_lock_irqsave(&wdtpci_lock, flags); | |
142 | ||
143 | /* | |
144 | * "pet" the watchdog, as Access says. | |
145 | * This resets the clock outputs. | |
146 | */ | |
9f2d1f0d AC |
147 | inb(WDT_DC); /* Disable watchdog */ |
148 | udelay(8); | |
149 | wdtpci_ctr_mode(2, 0); /* Program CTR2 for Mode 0: | |
150 | Pulse on Terminal Count */ | |
151 | outb(0, WDT_DC); /* Enable watchdog */ | |
152 | udelay(8); | |
153 | inb(WDT_DC); /* Disable watchdog */ | |
154 | udelay(8); | |
155 | outb(0, WDT_CLOCK); /* 2.0833MHz clock */ | |
156 | udelay(8); | |
157 | inb(WDT_BUZZER); /* disable */ | |
158 | udelay(8); | |
159 | inb(WDT_OPTONOTRST); /* disable */ | |
160 | udelay(8); | |
161 | inb(WDT_OPTORST); /* disable */ | |
162 | udelay(8); | |
163 | inb(WDT_PROGOUT); /* disable */ | |
164 | udelay(8); | |
165 | wdtpci_ctr_mode(0, 3); /* Program CTR0 for Mode 3: | |
166 | Square Wave Generator */ | |
167 | wdtpci_ctr_mode(1, 2); /* Program CTR1 for Mode 2: | |
168 | Rate Generator */ | |
169 | wdtpci_ctr_mode(2, 1); /* Program CTR2 for Mode 1: | |
170 | Retriggerable One-Shot */ | |
171 | wdtpci_ctr_load(0, 20833); /* count at 100Hz */ | |
172 | wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */ | |
1da177e4 | 173 | /* DO NOT LOAD CTR2 on PCI card! -- JPN */ |
9f2d1f0d AC |
174 | outb(0, WDT_DC); /* Enable watchdog */ |
175 | udelay(8); | |
1da177e4 LT |
176 | |
177 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
178 | return 0; | |
179 | } | |
180 | ||
181 | /** | |
182 | * wdtpci_stop: | |
183 | * | |
184 | * Stop the watchdog driver. | |
185 | */ | |
186 | ||
9f2d1f0d | 187 | static int wdtpci_stop(void) |
1da177e4 LT |
188 | { |
189 | unsigned long flags; | |
190 | ||
191 | /* Turn the card off */ | |
192 | spin_lock_irqsave(&wdtpci_lock, flags); | |
9f2d1f0d AC |
193 | inb(WDT_DC); /* Disable watchdog */ |
194 | udelay(8); | |
195 | wdtpci_ctr_load(2, 0); /* 0 length reset pulses now */ | |
1da177e4 LT |
196 | spin_unlock_irqrestore(&wdtpci_lock, flags); |
197 | return 0; | |
198 | } | |
199 | ||
200 | /** | |
201 | * wdtpci_ping: | |
202 | * | |
9f2d1f0d AC |
203 | * Reload counter one with the watchdog heartbeat. We don't bother |
204 | * reloading the cascade counter. | |
1da177e4 LT |
205 | */ |
206 | ||
207 | static int wdtpci_ping(void) | |
208 | { | |
209 | unsigned long flags; | |
210 | ||
1da177e4 | 211 | spin_lock_irqsave(&wdtpci_lock, flags); |
9f2d1f0d AC |
212 | /* Write a watchdog value */ |
213 | inb(WDT_DC); /* Disable watchdog */ | |
214 | udelay(8); | |
215 | wdtpci_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2: | |
216 | Rate Generator */ | |
217 | wdtpci_ctr_load(1, wd_heartbeat);/* Heartbeat */ | |
218 | outb(0, WDT_DC); /* Enable watchdog */ | |
219 | udelay(8); | |
1da177e4 LT |
220 | spin_unlock_irqrestore(&wdtpci_lock, flags); |
221 | return 0; | |
222 | } | |
223 | ||
224 | /** | |
225 | * wdtpci_set_heartbeat: | |
226 | * @t: the new heartbeat value that needs to be set. | |
227 | * | |
9f2d1f0d AC |
228 | * Set a new heartbeat value for the watchdog device. If the heartbeat |
229 | * value is incorrect we keep the old value and return -EINVAL. | |
230 | * If successful we return 0. | |
1da177e4 LT |
231 | */ |
232 | static int wdtpci_set_heartbeat(int t) | |
233 | { | |
234 | /* Arbitrary, can't find the card's limits */ | |
9f2d1f0d | 235 | if (t < 1 || t > 65535) |
1da177e4 LT |
236 | return -EINVAL; |
237 | ||
238 | heartbeat = t; | |
239 | wd_heartbeat = t * 100; | |
240 | return 0; | |
241 | } | |
242 | ||
243 | /** | |
244 | * wdtpci_get_status: | |
245 | * @status: the new status. | |
246 | * | |
247 | * Extract the status information from a WDT watchdog device. There are | |
248 | * several board variants so we have to know which bits are valid. Some | |
249 | * bits default to one and some to zero in order to be maximally painful. | |
250 | * | |
251 | * we then map the bits onto the status ioctl flags. | |
252 | */ | |
253 | ||
254 | static int wdtpci_get_status(int *status) | |
255 | { | |
9f2d1f0d AC |
256 | unsigned char new_status; |
257 | unsigned long flags; | |
258 | ||
259 | spin_lock_irqsave(&wdtpci_lock, flags); | |
260 | new_status = inb(WDT_SR); | |
261 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
1da177e4 | 262 | |
9f2d1f0d | 263 | *status = 0; |
1da177e4 LT |
264 | if (new_status & WDC_SR_ISOI0) |
265 | *status |= WDIOF_EXTERN1; | |
266 | if (new_status & WDC_SR_ISII1) | |
267 | *status |= WDIOF_EXTERN2; | |
268 | #ifdef CONFIG_WDT_501_PCI | |
269 | if (!(new_status & WDC_SR_TGOOD)) | |
270 | *status |= WDIOF_OVERHEAT; | |
271 | if (!(new_status & WDC_SR_PSUOVER)) | |
272 | *status |= WDIOF_POWEROVER; | |
273 | if (!(new_status & WDC_SR_PSUUNDR)) | |
274 | *status |= WDIOF_POWERUNDER; | |
275 | if (tachometer) { | |
276 | if (!(new_status & WDC_SR_FANGOOD)) | |
277 | *status |= WDIOF_FANFAULT; | |
278 | } | |
279 | #endif /* CONFIG_WDT_501_PCI */ | |
280 | return 0; | |
281 | } | |
282 | ||
283 | #ifdef CONFIG_WDT_501_PCI | |
284 | /** | |
285 | * wdtpci_get_temperature: | |
286 | * | |
287 | * Reports the temperature in degrees Fahrenheit. The API is in | |
288 | * farenheit. It was designed by an imperial measurement luddite. | |
289 | */ | |
290 | ||
291 | static int wdtpci_get_temperature(int *temperature) | |
292 | { | |
9f2d1f0d AC |
293 | unsigned short c; |
294 | unsigned long flags; | |
295 | spin_lock_irqsave(&wdtpci_lock, flags); | |
296 | c = inb(WDT_RT); | |
297 | udelay(8); | |
298 | spin_unlock_irqrestore(&wdtpci_lock, flags); | |
1da177e4 LT |
299 | *temperature = (c * 11 / 15) + 7; |
300 | return 0; | |
301 | } | |
302 | #endif /* CONFIG_WDT_501_PCI */ | |
303 | ||
304 | /** | |
305 | * wdtpci_interrupt: | |
306 | * @irq: Interrupt number | |
307 | * @dev_id: Unused as we don't allow multiple devices. | |
1da177e4 LT |
308 | * |
309 | * Handle an interrupt from the board. These are raised when the status | |
310 | * map changes in what the board considers an interesting way. That means | |
311 | * a failure condition occurring. | |
312 | */ | |
313 | ||
7d12e780 | 314 | static irqreturn_t wdtpci_interrupt(int irq, void *dev_id) |
1da177e4 LT |
315 | { |
316 | /* | |
317 | * Read the status register see what is up and | |
318 | * then printk it. | |
319 | */ | |
9f2d1f0d AC |
320 | unsigned char status; |
321 | ||
322 | spin_lock(&wdtpci_lock); | |
323 | ||
324 | status = inb(WDT_SR); | |
325 | udelay(8); | |
1da177e4 LT |
326 | |
327 | printk(KERN_CRIT PFX "status %d\n", status); | |
328 | ||
329 | #ifdef CONFIG_WDT_501_PCI | |
9f2d1f0d AC |
330 | if (!(status & WDC_SR_TGOOD)) { |
331 | u8 alarm = inb(WDT_RT); | |
332 | printk(KERN_CRIT PFX "Overheat alarm.(%d)\n", alarm); | |
333 | udelay(8); | |
334 | } | |
1da177e4 | 335 | if (!(status & WDC_SR_PSUOVER)) |
9f2d1f0d | 336 | printk(KERN_CRIT PFX "PSU over voltage.\n"); |
1da177e4 | 337 | if (!(status & WDC_SR_PSUUNDR)) |
9f2d1f0d | 338 | printk(KERN_CRIT PFX "PSU under voltage.\n"); |
1da177e4 LT |
339 | if (tachometer) { |
340 | if (!(status & WDC_SR_FANGOOD)) | |
341 | printk(KERN_CRIT PFX "Possible fan fault.\n"); | |
342 | } | |
343 | #endif /* CONFIG_WDT_501_PCI */ | |
59338d4c | 344 | if (!(status&WDC_SR_WCCR)) { |
1da177e4 LT |
345 | #ifdef SOFTWARE_REBOOT |
346 | #ifdef ONLY_TESTING | |
347 | printk(KERN_CRIT PFX "Would Reboot.\n"); | |
348 | #else | |
349 | printk(KERN_CRIT PFX "Initiating system reboot.\n"); | |
f82567e5 | 350 | emergency_restart(NULL); |
1da177e4 LT |
351 | #endif |
352 | #else | |
353 | printk(KERN_CRIT PFX "Reset in 5ms.\n"); | |
354 | #endif | |
59338d4c | 355 | } |
9f2d1f0d | 356 | spin_unlock(&wdtpci_lock); |
1da177e4 LT |
357 | return IRQ_HANDLED; |
358 | } | |
359 | ||
360 | ||
361 | /** | |
362 | * wdtpci_write: | |
363 | * @file: file handle to the watchdog | |
364 | * @buf: buffer to write (unused as data does not matter here | |
365 | * @count: count of bytes | |
366 | * @ppos: pointer to the position to write. No seeks allowed | |
367 | * | |
368 | * A write to a watchdog device is defined as a keepalive signal. Any | |
369 | * write of data will do, as we we don't define content meaning. | |
370 | */ | |
371 | ||
9f2d1f0d AC |
372 | static ssize_t wdtpci_write(struct file *file, const char __user *buf, |
373 | size_t count, loff_t *ppos) | |
1da177e4 LT |
374 | { |
375 | if (count) { | |
376 | if (!nowayout) { | |
377 | size_t i; | |
378 | ||
379 | expect_close = 0; | |
380 | ||
381 | for (i = 0; i != count; i++) { | |
382 | char c; | |
9f2d1f0d | 383 | if (get_user(c, buf+i)) |
1da177e4 LT |
384 | return -EFAULT; |
385 | if (c == 'V') | |
386 | expect_close = 42; | |
387 | } | |
388 | } | |
389 | wdtpci_ping(); | |
390 | } | |
1da177e4 LT |
391 | return count; |
392 | } | |
393 | ||
394 | /** | |
395 | * wdtpci_ioctl: | |
1da177e4 LT |
396 | * @file: file handle to the device |
397 | * @cmd: watchdog command | |
398 | * @arg: argument pointer | |
399 | * | |
400 | * The watchdog API defines a common set of functions for all watchdogs | |
401 | * according to their available features. We only actually usefully support | |
402 | * querying capabilities and current status. | |
403 | */ | |
404 | ||
9f2d1f0d AC |
405 | static long wdtpci_ioctl(struct file *file, unsigned int cmd, |
406 | unsigned long arg) | |
1da177e4 LT |
407 | { |
408 | int new_heartbeat; | |
409 | int status; | |
410 | void __user *argp = (void __user *)arg; | |
411 | int __user *p = argp; | |
412 | ||
413 | static struct watchdog_info ident = { | |
414 | .options = WDIOF_SETTIMEOUT| | |
415 | WDIOF_MAGICCLOSE| | |
416 | WDIOF_KEEPALIVEPING, | |
417 | .firmware_version = 1, | |
418 | .identity = "PCI-WDT500/501", | |
419 | }; | |
420 | ||
421 | /* Add options according to the card we have */ | |
422 | ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2); | |
423 | #ifdef CONFIG_WDT_501_PCI | |
424 | ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER); | |
425 | if (tachometer) | |
426 | ident.options |= WDIOF_FANFAULT; | |
427 | #endif /* CONFIG_WDT_501_PCI */ | |
428 | ||
9f2d1f0d AC |
429 | switch (cmd) { |
430 | default: | |
431 | return -ENOTTY; | |
432 | case WDIOC_GETSUPPORT: | |
433 | return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; | |
434 | case WDIOC_GETSTATUS: | |
435 | wdtpci_get_status(&status); | |
436 | return put_user(status, p); | |
437 | case WDIOC_GETBOOTSTATUS: | |
438 | return put_user(0, p); | |
439 | case WDIOC_KEEPALIVE: | |
440 | wdtpci_ping(); | |
441 | return 0; | |
442 | case WDIOC_SETTIMEOUT: | |
443 | if (get_user(new_heartbeat, p)) | |
444 | return -EFAULT; | |
445 | if (wdtpci_set_heartbeat(new_heartbeat)) | |
446 | return -EINVAL; | |
447 | wdtpci_ping(); | |
448 | /* Fall */ | |
449 | case WDIOC_GETTIMEOUT: | |
450 | return put_user(heartbeat, p); | |
451 | } | |
1da177e4 LT |
452 | } |
453 | ||
454 | /** | |
455 | * wdtpci_open: | |
456 | * @inode: inode of device | |
457 | * @file: file handle to device | |
458 | * | |
459 | * The watchdog device has been opened. The watchdog device is single | |
460 | * open and on opening we load the counters. Counter zero is a 100Hz | |
461 | * cascade, into counter 1 which downcounts to reboot. When the counter | |
462 | * triggers counter 2 downcounts the length of the reset pulse which | |
463 | * set set to be as long as possible. | |
464 | */ | |
465 | ||
466 | static int wdtpci_open(struct inode *inode, struct file *file) | |
467 | { | |
9f2d1f0d | 468 | if (test_and_set_bit(0, &open_lock)) |
1da177e4 LT |
469 | return -EBUSY; |
470 | ||
9f2d1f0d | 471 | if (nowayout) |
1da177e4 | 472 | __module_get(THIS_MODULE); |
1da177e4 LT |
473 | /* |
474 | * Activate | |
475 | */ | |
476 | wdtpci_start(); | |
477 | return nonseekable_open(inode, file); | |
478 | } | |
479 | ||
480 | /** | |
481 | * wdtpci_release: | |
482 | * @inode: inode to board | |
483 | * @file: file handle to board | |
484 | * | |
485 | * The watchdog has a configurable API. There is a religious dispute | |
486 | * between people who want their watchdog to be able to shut down and | |
487 | * those who want to be sure if the watchdog manager dies the machine | |
488 | * reboots. In the former case we disable the counters, in the latter | |
489 | * case you have to open it again very soon. | |
490 | */ | |
491 | ||
492 | static int wdtpci_release(struct inode *inode, struct file *file) | |
493 | { | |
494 | if (expect_close == 42) { | |
495 | wdtpci_stop(); | |
496 | } else { | |
497 | printk(KERN_CRIT PFX "Unexpected close, not stopping timer!"); | |
498 | wdtpci_ping(); | |
499 | } | |
500 | expect_close = 0; | |
9f2d1f0d | 501 | clear_bit(0, &open_lock); |
1da177e4 LT |
502 | return 0; |
503 | } | |
504 | ||
505 | #ifdef CONFIG_WDT_501_PCI | |
506 | /** | |
507 | * wdtpci_temp_read: | |
508 | * @file: file handle to the watchdog board | |
509 | * @buf: buffer to write 1 byte into | |
510 | * @count: length of buffer | |
511 | * @ptr: offset (no seek allowed) | |
512 | * | |
513 | * Read reports the temperature in degrees Fahrenheit. The API is in | |
514 | * fahrenheit. It was designed by an imperial measurement luddite. | |
515 | */ | |
516 | ||
9f2d1f0d AC |
517 | static ssize_t wdtpci_temp_read(struct file *file, char __user *buf, |
518 | size_t count, loff_t *ptr) | |
1da177e4 LT |
519 | { |
520 | int temperature; | |
521 | ||
522 | if (wdtpci_get_temperature(&temperature)) | |
523 | return -EFAULT; | |
524 | ||
9f2d1f0d | 525 | if (copy_to_user(buf, &temperature, 1)) |
1da177e4 LT |
526 | return -EFAULT; |
527 | ||
528 | return 1; | |
529 | } | |
530 | ||
531 | /** | |
532 | * wdtpci_temp_open: | |
533 | * @inode: inode of device | |
534 | * @file: file handle to device | |
535 | * | |
536 | * The temperature device has been opened. | |
537 | */ | |
538 | ||
539 | static int wdtpci_temp_open(struct inode *inode, struct file *file) | |
540 | { | |
541 | return nonseekable_open(inode, file); | |
542 | } | |
543 | ||
544 | /** | |
545 | * wdtpci_temp_release: | |
546 | * @inode: inode to board | |
547 | * @file: file handle to board | |
548 | * | |
549 | * The temperature device has been closed. | |
550 | */ | |
551 | ||
552 | static int wdtpci_temp_release(struct inode *inode, struct file *file) | |
553 | { | |
554 | return 0; | |
555 | } | |
556 | #endif /* CONFIG_WDT_501_PCI */ | |
557 | ||
558 | /** | |
559 | * notify_sys: | |
560 | * @this: our notifier block | |
561 | * @code: the event being reported | |
562 | * @unused: unused | |
563 | * | |
564 | * Our notifier is called on system shutdowns. We want to turn the card | |
565 | * off at reboot otherwise the machine will reboot again during memory | |
566 | * test or worse yet during the following fsck. This would suck, in fact | |
567 | * trust me - if it happens it does suck. | |
568 | */ | |
569 | ||
570 | static int wdtpci_notify_sys(struct notifier_block *this, unsigned long code, | |
9f2d1f0d | 571 | void *unused) |
1da177e4 | 572 | { |
9f2d1f0d | 573 | if (code == SYS_DOWN || code == SYS_HALT) |
1da177e4 | 574 | wdtpci_stop(); |
1da177e4 LT |
575 | return NOTIFY_DONE; |
576 | } | |
577 | ||
578 | /* | |
579 | * Kernel Interfaces | |
580 | */ | |
581 | ||
582 | ||
62322d25 | 583 | static const struct file_operations wdtpci_fops = { |
1da177e4 LT |
584 | .owner = THIS_MODULE, |
585 | .llseek = no_llseek, | |
586 | .write = wdtpci_write, | |
9f2d1f0d | 587 | .unlocked_ioctl = wdtpci_ioctl, |
1da177e4 LT |
588 | .open = wdtpci_open, |
589 | .release = wdtpci_release, | |
590 | }; | |
591 | ||
592 | static struct miscdevice wdtpci_miscdev = { | |
593 | .minor = WATCHDOG_MINOR, | |
594 | .name = "watchdog", | |
595 | .fops = &wdtpci_fops, | |
596 | }; | |
597 | ||
598 | #ifdef CONFIG_WDT_501_PCI | |
62322d25 | 599 | static const struct file_operations wdtpci_temp_fops = { |
1da177e4 LT |
600 | .owner = THIS_MODULE, |
601 | .llseek = no_llseek, | |
602 | .read = wdtpci_temp_read, | |
603 | .open = wdtpci_temp_open, | |
604 | .release = wdtpci_temp_release, | |
605 | }; | |
606 | ||
607 | static struct miscdevice temp_miscdev = { | |
608 | .minor = TEMP_MINOR, | |
609 | .name = "temperature", | |
610 | .fops = &wdtpci_temp_fops, | |
611 | }; | |
612 | #endif /* CONFIG_WDT_501_PCI */ | |
613 | ||
614 | /* | |
615 | * The WDT card needs to learn about soft shutdowns in order to | |
616 | * turn the timebomb registers off. | |
617 | */ | |
618 | ||
619 | static struct notifier_block wdtpci_notifier = { | |
620 | .notifier_call = wdtpci_notify_sys, | |
621 | }; | |
622 | ||
623 | ||
9f2d1f0d AC |
624 | static int __devinit wdtpci_init_one(struct pci_dev *dev, |
625 | const struct pci_device_id *ent) | |
1da177e4 LT |
626 | { |
627 | int ret = -EIO; | |
628 | ||
629 | dev_count++; | |
630 | if (dev_count > 1) { | |
9f2d1f0d | 631 | printk(KERN_ERR PFX "This driver only supports one device\n"); |
1da177e4 LT |
632 | return -ENODEV; |
633 | } | |
634 | ||
9f2d1f0d AC |
635 | if (pci_enable_device(dev)) { |
636 | printk(KERN_ERR PFX "Not possible to enable PCI Device\n"); | |
1da177e4 LT |
637 | return -ENODEV; |
638 | } | |
639 | ||
9f2d1f0d AC |
640 | if (pci_resource_start(dev, 2) == 0x0000) { |
641 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); | |
1da177e4 LT |
642 | ret = -ENODEV; |
643 | goto out_pci; | |
644 | } | |
645 | ||
1da177e4 | 646 | irq = dev->irq; |
9f2d1f0d | 647 | io = pci_resource_start(dev, 2); |
1da177e4 | 648 | |
9f2d1f0d AC |
649 | if (request_region(io, 16, "wdt_pci") == NULL) { |
650 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", io); | |
1da177e4 LT |
651 | goto out_pci; |
652 | } | |
653 | ||
9f2d1f0d | 654 | if (request_irq(irq, wdtpci_interrupt, IRQF_DISABLED | IRQF_SHARED, |
1da177e4 | 655 | "wdt_pci", &wdtpci_miscdev)) { |
9f2d1f0d | 656 | printk(KERN_ERR PFX "IRQ %d is not free\n", irq); |
1da177e4 LT |
657 | goto out_reg; |
658 | } | |
659 | ||
9f2d1f0d AC |
660 | printk(KERN_INFO |
661 | "PCI-WDT500/501 (PCI-WDG-CSM) driver 0.10 at 0x%04x (Interrupt %d)\n", | |
662 | io, irq); | |
1da177e4 | 663 | |
9f2d1f0d AC |
664 | /* Check that the heartbeat value is within its range; |
665 | if not reset to the default */ | |
1da177e4 LT |
666 | if (wdtpci_set_heartbeat(heartbeat)) { |
667 | wdtpci_set_heartbeat(WD_TIMO); | |
9f2d1f0d AC |
668 | printk(KERN_INFO PFX |
669 | "heartbeat value must be 0 < heartbeat < 65536, using %d\n", | |
670 | WD_TIMO); | |
1da177e4 LT |
671 | } |
672 | ||
9f2d1f0d | 673 | ret = register_reboot_notifier(&wdtpci_notifier); |
1da177e4 | 674 | if (ret) { |
9f2d1f0d AC |
675 | printk(KERN_ERR PFX |
676 | "cannot register reboot notifier (err=%d)\n", ret); | |
1da177e4 LT |
677 | goto out_irq; |
678 | } | |
679 | ||
680 | #ifdef CONFIG_WDT_501_PCI | |
9f2d1f0d | 681 | ret = misc_register(&temp_miscdev); |
1da177e4 | 682 | if (ret) { |
9f2d1f0d AC |
683 | printk(KERN_ERR PFX |
684 | "cannot register miscdev on minor=%d (err=%d)\n", | |
685 | TEMP_MINOR, ret); | |
1da177e4 LT |
686 | goto out_rbt; |
687 | } | |
688 | #endif /* CONFIG_WDT_501_PCI */ | |
689 | ||
9f2d1f0d | 690 | ret = misc_register(&wdtpci_miscdev); |
1da177e4 | 691 | if (ret) { |
9f2d1f0d AC |
692 | printk(KERN_ERR PFX |
693 | "cannot register miscdev on minor=%d (err=%d)\n", | |
694 | WATCHDOG_MINOR, ret); | |
1da177e4 LT |
695 | goto out_misc; |
696 | } | |
697 | ||
698 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", | |
699 | heartbeat, nowayout); | |
700 | #ifdef CONFIG_WDT_501_PCI | |
9f2d1f0d AC |
701 | printk(KERN_INFO "wdt: Fan Tachometer is %s\n", |
702 | (tachometer ? "Enabled" : "Disabled")); | |
1da177e4 LT |
703 | #endif /* CONFIG_WDT_501_PCI */ |
704 | ||
705 | ret = 0; | |
706 | out: | |
707 | return ret; | |
708 | ||
709 | out_misc: | |
710 | #ifdef CONFIG_WDT_501_PCI | |
711 | misc_deregister(&temp_miscdev); | |
712 | out_rbt: | |
713 | #endif /* CONFIG_WDT_501_PCI */ | |
714 | unregister_reboot_notifier(&wdtpci_notifier); | |
715 | out_irq: | |
716 | free_irq(irq, &wdtpci_miscdev); | |
717 | out_reg: | |
9f2d1f0d | 718 | release_region(io, 16); |
1da177e4 LT |
719 | out_pci: |
720 | pci_disable_device(dev); | |
721 | goto out; | |
722 | } | |
723 | ||
724 | ||
9f2d1f0d | 725 | static void __devexit wdtpci_remove_one(struct pci_dev *pdev) |
1da177e4 LT |
726 | { |
727 | /* here we assume only one device will ever have | |
728 | * been picked up and registered by probe function */ | |
729 | misc_deregister(&wdtpci_miscdev); | |
730 | #ifdef CONFIG_WDT_501_PCI | |
731 | misc_deregister(&temp_miscdev); | |
732 | #endif /* CONFIG_WDT_501_PCI */ | |
733 | unregister_reboot_notifier(&wdtpci_notifier); | |
734 | free_irq(irq, &wdtpci_miscdev); | |
735 | release_region(io, 16); | |
736 | pci_disable_device(pdev); | |
737 | dev_count--; | |
738 | } | |
739 | ||
740 | ||
741 | static struct pci_device_id wdtpci_pci_tbl[] = { | |
742 | { | |
743 | .vendor = PCI_VENDOR_ID_ACCESSIO, | |
744 | .device = PCI_DEVICE_ID_WDG_CSM, | |
745 | .subvendor = PCI_ANY_ID, | |
746 | .subdevice = PCI_ANY_ID, | |
747 | }, | |
748 | { 0, }, /* terminate list */ | |
749 | }; | |
750 | MODULE_DEVICE_TABLE(pci, wdtpci_pci_tbl); | |
751 | ||
752 | ||
753 | static struct pci_driver wdtpci_driver = { | |
754 | .name = "wdt_pci", | |
755 | .id_table = wdtpci_pci_tbl, | |
756 | .probe = wdtpci_init_one, | |
757 | .remove = __devexit_p(wdtpci_remove_one), | |
758 | }; | |
759 | ||
760 | ||
761 | /** | |
762 | * wdtpci_cleanup: | |
763 | * | |
764 | * Unload the watchdog. You cannot do this with any file handles open. | |
765 | * If your watchdog is set to continue ticking on close and you unload | |
766 | * it, well it keeps ticking. We won't get the interrupt but the board | |
767 | * will not touch PC memory so all is fine. You just have to load a new | |
768 | * module in xx seconds or reboot. | |
769 | */ | |
770 | ||
771 | static void __exit wdtpci_cleanup(void) | |
772 | { | |
9f2d1f0d | 773 | pci_unregister_driver(&wdtpci_driver); |
1da177e4 LT |
774 | } |
775 | ||
776 | ||
777 | /** | |
778 | * wdtpci_init: | |
779 | * | |
780 | * Set up the WDT watchdog board. All we have to do is grab the | |
781 | * resources we require and bitch if anyone beat us to them. | |
782 | * The open() function will actually kick the board off. | |
783 | */ | |
784 | ||
785 | static int __init wdtpci_init(void) | |
786 | { | |
9f2d1f0d | 787 | return pci_register_driver(&wdtpci_driver); |
1da177e4 LT |
788 | } |
789 | ||
790 | ||
791 | module_init(wdtpci_init); | |
792 | module_exit(wdtpci_cleanup); | |
793 | ||
794 | MODULE_AUTHOR("JP Nollmann, Alan Cox"); | |
795 | MODULE_DESCRIPTION("Driver for the ICS PCI-WDT500/501 watchdog cards"); | |
796 | MODULE_LICENSE("GPL"); | |
797 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); | |
798 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |