Root/
1 | /* |
2 | * Berkshire PCI-PC Watchdog Card Driver |
3 | * |
4 | * (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>. |
5 | * |
6 | * Based on source code of the following authors: |
7 | * Ken Hollis <kenji@bitgate.com>, |
8 | * Lindsay Harris <lindsay@bluegum.com>, |
9 | * Alan Cox <alan@lxorguk.ukuu.org.uk>, |
10 | * Matt Domsch <Matt_Domsch@dell.com>, |
11 | * Rob Radez <rob@osinvestor.com> |
12 | * |
13 | * This program is free software; you can redistribute it and/or |
14 | * modify it under the terms of the GNU General Public License |
15 | * as published by the Free Software Foundation; either version |
16 | * 2 of the License, or (at your option) any later version. |
17 | * |
18 | * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor |
19 | * provide warranty for any of this software. This material is |
20 | * provided "AS-IS" and at no charge. |
21 | */ |
22 | |
23 | /* |
24 | * A bells and whistles driver is available from: |
25 | * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/ |
26 | * |
27 | * More info available at |
28 | * http://www.berkprod.com/ or http://www.pcwatchdog.com/ |
29 | */ |
30 | |
31 | /* |
32 | * Includes, defines, variables, module parameters, ... |
33 | */ |
34 | |
35 | #include <linux/module.h> /* For module specific items */ |
36 | #include <linux/moduleparam.h> /* For new moduleparam's */ |
37 | #include <linux/types.h> /* For standard types (like size_t) */ |
38 | #include <linux/errno.h> /* For the -ENODEV/... values */ |
39 | #include <linux/kernel.h> /* For printk/panic/... */ |
40 | #include <linux/delay.h> /* For mdelay function */ |
41 | #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ |
42 | #include <linux/watchdog.h> /* For the watchdog specific items */ |
43 | #include <linux/notifier.h> /* For notifier support */ |
44 | #include <linux/reboot.h> /* For reboot_notifier stuff */ |
45 | #include <linux/init.h> /* For __init/__exit/... */ |
46 | #include <linux/fs.h> /* For file operations */ |
47 | #include <linux/pci.h> /* For pci functions */ |
48 | #include <linux/ioport.h> /* For io-port access */ |
49 | #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ |
50 | #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ |
51 | #include <linux/io.h> /* For inb/outb/... */ |
52 | |
53 | /* Module and version information */ |
54 | #define WATCHDOG_VERSION "1.03" |
55 | #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog" |
56 | #define WATCHDOG_NAME "pcwd_pci" |
57 | #define PFX WATCHDOG_NAME ": " |
58 | #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n" |
59 | |
60 | /* Stuff for the PCI ID's */ |
61 | #ifndef PCI_VENDOR_ID_QUICKLOGIC |
62 | #define PCI_VENDOR_ID_QUICKLOGIC 0x11e3 |
63 | #endif |
64 | |
65 | #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD |
66 | #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030 |
67 | #endif |
68 | |
69 | /* |
70 | * These are the defines that describe the control status bits for the |
71 | * PCI-PC Watchdog card. |
72 | */ |
73 | /* Port 1 : Control Status #1 */ |
74 | #define WD_PCI_WTRP 0x01 /* Watchdog Trip status */ |
75 | #define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */ |
76 | #define WD_PCI_TTRP 0x04 /* Temperature Trip status */ |
77 | #define WD_PCI_RL2A 0x08 /* Relay 2 Active */ |
78 | #define WD_PCI_RL1A 0x10 /* Relay 1 Active */ |
79 | #define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip / |
80 | reset */ |
81 | #define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */ |
82 | /* Port 2 : Control Status #2 */ |
83 | #define WD_PCI_WDIS 0x10 /* Watchdog Disable */ |
84 | #define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */ |
85 | #define WD_PCI_WRSP 0x40 /* Watchdog wrote response */ |
86 | #define WD_PCI_PCMD 0x80 /* PC has sent command */ |
87 | |
88 | /* according to documentation max. time to process a command for the pci |
89 | * watchdog card is 100 ms, so we give it 150 ms to do it's job */ |
90 | #define PCI_COMMAND_TIMEOUT 150 |
91 | |
92 | /* Watchdog's internal commands */ |
93 | #define CMD_GET_STATUS 0x04 |
94 | #define CMD_GET_FIRMWARE_VERSION 0x08 |
95 | #define CMD_READ_WATCHDOG_TIMEOUT 0x18 |
96 | #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 |
97 | #define CMD_GET_CLEAR_RESET_COUNT 0x84 |
98 | |
99 | /* Watchdog's Dip Switch heartbeat values */ |
100 | static const int heartbeat_tbl[] = { |
101 | 5, /* OFF-OFF-OFF = 5 Sec */ |
102 | 10, /* OFF-OFF-ON = 10 Sec */ |
103 | 30, /* OFF-ON-OFF = 30 Sec */ |
104 | 60, /* OFF-ON-ON = 1 Min */ |
105 | 300, /* ON-OFF-OFF = 5 Min */ |
106 | 600, /* ON-OFF-ON = 10 Min */ |
107 | 1800, /* ON-ON-OFF = 30 Min */ |
108 | 3600, /* ON-ON-ON = 1 hour */ |
109 | }; |
110 | |
111 | /* We can only use 1 card due to the /dev/watchdog restriction */ |
112 | static int cards_found; |
113 | |
114 | /* internal variables */ |
115 | static int temp_panic; |
116 | static unsigned long is_active; |
117 | static char expect_release; |
118 | /* this is private data for each PCI-PC watchdog card */ |
119 | static struct { |
120 | /* Wether or not the card has a temperature device */ |
121 | int supports_temp; |
122 | /* The card's boot status */ |
123 | int boot_status; |
124 | /* The cards I/O address */ |
125 | unsigned long io_addr; |
126 | /* the lock for io operations */ |
127 | spinlock_t io_lock; |
128 | /* the PCI-device */ |
129 | struct pci_dev *pdev; |
130 | } pcipcwd_private; |
131 | |
132 | /* module parameters */ |
133 | #define QUIET 0 /* Default */ |
134 | #define VERBOSE 1 /* Verbose */ |
135 | #define DEBUG 2 /* print fancy stuff too */ |
136 | static int debug = QUIET; |
137 | module_param(debug, int, 0); |
138 | MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); |
139 | |
140 | #define WATCHDOG_HEARTBEAT 0 /* default heartbeat = |
141 | delay-time from dip-switches */ |
142 | static int heartbeat = WATCHDOG_HEARTBEAT; |
143 | module_param(heartbeat, int, 0); |
144 | MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " |
145 | "(0<heartbeat<65536 or 0=delay-time from dip-switches, default=" |
146 | __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); |
147 | |
148 | static int nowayout = WATCHDOG_NOWAYOUT; |
149 | module_param(nowayout, int, 0); |
150 | MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
151 | __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
152 | |
153 | /* |
154 | * Internal functions |
155 | */ |
156 | |
157 | static int send_command(int cmd, int *msb, int *lsb) |
158 | { |
159 | int got_response, count; |
160 | |
161 | if (debug >= DEBUG) |
162 | printk(KERN_DEBUG PFX "sending following data " |
163 | "cmd=0x%02x msb=0x%02x lsb=0x%02x\n", cmd, *msb, *lsb); |
164 | |
165 | spin_lock(&pcipcwd_private.io_lock); |
166 | /* If a command requires data it should be written first. |
167 | * Data for commands with 8 bits of data should be written to port 4. |
168 | * Commands with 16 bits of data, should be written as LSB to port 4 |
169 | * and MSB to port 5. |
170 | * After the required data has been written then write the command to |
171 | * port 6. */ |
172 | outb_p(*lsb, pcipcwd_private.io_addr + 4); |
173 | outb_p(*msb, pcipcwd_private.io_addr + 5); |
174 | outb_p(cmd, pcipcwd_private.io_addr + 6); |
175 | |
176 | /* wait till the pci card processed the command, signaled by |
177 | * the WRSP bit in port 2 and give it a max. timeout of |
178 | * PCI_COMMAND_TIMEOUT to process */ |
179 | got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; |
180 | for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); |
181 | count++) { |
182 | mdelay(1); |
183 | got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; |
184 | } |
185 | |
186 | if (debug >= DEBUG) { |
187 | if (got_response) { |
188 | printk(KERN_DEBUG PFX |
189 | "time to process command was: %d ms\n", |
190 | count); |
191 | } else { |
192 | printk(KERN_DEBUG PFX |
193 | "card did not respond on command!\n"); |
194 | } |
195 | } |
196 | |
197 | if (got_response) { |
198 | /* read back response */ |
199 | *lsb = inb_p(pcipcwd_private.io_addr + 4); |
200 | *msb = inb_p(pcipcwd_private.io_addr + 5); |
201 | |
202 | /* clear WRSP bit */ |
203 | inb_p(pcipcwd_private.io_addr + 6); |
204 | |
205 | if (debug >= DEBUG) |
206 | printk(KERN_DEBUG PFX "received following data for " |
207 | "cmd=0x%02x: msb=0x%02x lsb=0x%02x\n", |
208 | cmd, *msb, *lsb); |
209 | } |
210 | |
211 | spin_unlock(&pcipcwd_private.io_lock); |
212 | |
213 | return got_response; |
214 | } |
215 | |
216 | static inline void pcipcwd_check_temperature_support(void) |
217 | { |
218 | if (inb_p(pcipcwd_private.io_addr) != 0xF0) |
219 | pcipcwd_private.supports_temp = 1; |
220 | } |
221 | |
222 | static int pcipcwd_get_option_switches(void) |
223 | { |
224 | int option_switches; |
225 | |
226 | option_switches = inb_p(pcipcwd_private.io_addr + 3); |
227 | return option_switches; |
228 | } |
229 | |
230 | static void pcipcwd_show_card_info(void) |
231 | { |
232 | int got_fw_rev, fw_rev_major, fw_rev_minor; |
233 | char fw_ver_str[20]; /* The cards firmware version */ |
234 | int option_switches; |
235 | |
236 | got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, |
237 | &fw_rev_minor); |
238 | if (got_fw_rev) |
239 | sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); |
240 | else |
241 | sprintf(fw_ver_str, "<card no answer>"); |
242 | |
243 | /* Get switch settings */ |
244 | option_switches = pcipcwd_get_option_switches(); |
245 | |
246 | printk(KERN_INFO PFX "Found card at port " |
247 | "0x%04x (Firmware: %s) %s temp option\n", |
248 | (int) pcipcwd_private.io_addr, fw_ver_str, |
249 | (pcipcwd_private.supports_temp ? "with" : "without")); |
250 | |
251 | printk(KERN_INFO PFX "Option switches (0x%02x): " |
252 | "Temperature Reset Enable=%s, Power On Delay=%s\n", |
253 | option_switches, |
254 | ((option_switches & 0x10) ? "ON" : "OFF"), |
255 | ((option_switches & 0x08) ? "ON" : "OFF")); |
256 | |
257 | if (pcipcwd_private.boot_status & WDIOF_CARDRESET) |
258 | printk(KERN_INFO PFX |
259 | "Previous reset was caused by the Watchdog card\n"); |
260 | |
261 | if (pcipcwd_private.boot_status & WDIOF_OVERHEAT) |
262 | printk(KERN_INFO PFX "Card sensed a CPU Overheat\n"); |
263 | |
264 | if (pcipcwd_private.boot_status == 0) |
265 | printk(KERN_INFO PFX |
266 | "No previous trip detected - Cold boot or reset\n"); |
267 | } |
268 | |
269 | static int pcipcwd_start(void) |
270 | { |
271 | int stat_reg; |
272 | |
273 | spin_lock(&pcipcwd_private.io_lock); |
274 | outb_p(0x00, pcipcwd_private.io_addr + 3); |
275 | udelay(1000); |
276 | |
277 | stat_reg = inb_p(pcipcwd_private.io_addr + 2); |
278 | spin_unlock(&pcipcwd_private.io_lock); |
279 | |
280 | if (stat_reg & WD_PCI_WDIS) { |
281 | printk(KERN_ERR PFX "Card timer not enabled\n"); |
282 | return -1; |
283 | } |
284 | |
285 | if (debug >= VERBOSE) |
286 | printk(KERN_DEBUG PFX "Watchdog started\n"); |
287 | |
288 | return 0; |
289 | } |
290 | |
291 | static int pcipcwd_stop(void) |
292 | { |
293 | int stat_reg; |
294 | |
295 | spin_lock(&pcipcwd_private.io_lock); |
296 | outb_p(0xA5, pcipcwd_private.io_addr + 3); |
297 | udelay(1000); |
298 | |
299 | outb_p(0xA5, pcipcwd_private.io_addr + 3); |
300 | udelay(1000); |
301 | |
302 | stat_reg = inb_p(pcipcwd_private.io_addr + 2); |
303 | spin_unlock(&pcipcwd_private.io_lock); |
304 | |
305 | if (!(stat_reg & WD_PCI_WDIS)) { |
306 | printk(KERN_ERR PFX |
307 | "Card did not acknowledge disable attempt\n"); |
308 | return -1; |
309 | } |
310 | |
311 | if (debug >= VERBOSE) |
312 | printk(KERN_DEBUG PFX "Watchdog stopped\n"); |
313 | |
314 | return 0; |
315 | } |
316 | |
317 | static int pcipcwd_keepalive(void) |
318 | { |
319 | /* Re-trigger watchdog by writing to port 0 */ |
320 | spin_lock(&pcipcwd_private.io_lock); |
321 | outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */ |
322 | spin_unlock(&pcipcwd_private.io_lock); |
323 | |
324 | if (debug >= DEBUG) |
325 | printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n"); |
326 | |
327 | return 0; |
328 | } |
329 | |
330 | static int pcipcwd_set_heartbeat(int t) |
331 | { |
332 | int t_msb = t / 256; |
333 | int t_lsb = t % 256; |
334 | |
335 | if ((t < 0x0001) || (t > 0xFFFF)) |
336 | return -EINVAL; |
337 | |
338 | /* Write new heartbeat to watchdog */ |
339 | send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb); |
340 | |
341 | heartbeat = t; |
342 | if (debug >= VERBOSE) |
343 | printk(KERN_DEBUG PFX "New heartbeat: %d\n", |
344 | heartbeat); |
345 | |
346 | return 0; |
347 | } |
348 | |
349 | static int pcipcwd_get_status(int *status) |
350 | { |
351 | int control_status; |
352 | |
353 | *status = 0; |
354 | control_status = inb_p(pcipcwd_private.io_addr + 1); |
355 | if (control_status & WD_PCI_WTRP) |
356 | *status |= WDIOF_CARDRESET; |
357 | if (control_status & WD_PCI_TTRP) { |
358 | *status |= WDIOF_OVERHEAT; |
359 | if (temp_panic) |
360 | panic(PFX "Temperature overheat trip!\n"); |
361 | } |
362 | |
363 | if (debug >= DEBUG) |
364 | printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n", |
365 | control_status); |
366 | |
367 | return 0; |
368 | } |
369 | |
370 | static int pcipcwd_clear_status(void) |
371 | { |
372 | int control_status; |
373 | int msb; |
374 | int reset_counter; |
375 | |
376 | if (debug >= VERBOSE) |
377 | printk(KERN_INFO PFX "clearing watchdog trip status & LED\n"); |
378 | |
379 | control_status = inb_p(pcipcwd_private.io_addr + 1); |
380 | |
381 | if (debug >= DEBUG) { |
382 | printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status); |
383 | printk(KERN_DEBUG PFX "sending: 0x%02x\n", |
384 | (control_status & WD_PCI_R2DS) | WD_PCI_WTRP); |
385 | } |
386 | |
387 | /* clear trip status & LED and keep mode of relay 2 */ |
388 | outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, |
389 | pcipcwd_private.io_addr + 1); |
390 | |
391 | /* clear reset counter */ |
392 | msb = 0; |
393 | reset_counter = 0xff; |
394 | send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter); |
395 | |
396 | if (debug >= DEBUG) { |
397 | printk(KERN_DEBUG PFX "reset count was: 0x%02x\n", |
398 | reset_counter); |
399 | } |
400 | |
401 | return 0; |
402 | } |
403 | |
404 | static int pcipcwd_get_temperature(int *temperature) |
405 | { |
406 | *temperature = 0; |
407 | if (!pcipcwd_private.supports_temp) |
408 | return -ENODEV; |
409 | |
410 | spin_lock(&pcipcwd_private.io_lock); |
411 | *temperature = inb_p(pcipcwd_private.io_addr); |
412 | spin_unlock(&pcipcwd_private.io_lock); |
413 | |
414 | /* |
415 | * Convert celsius to fahrenheit, since this was |
416 | * the decided 'standard' for this return value. |
417 | */ |
418 | *temperature = (*temperature * 9 / 5) + 32; |
419 | |
420 | if (debug >= DEBUG) { |
421 | printk(KERN_DEBUG PFX "temperature is: %d F\n", |
422 | *temperature); |
423 | } |
424 | |
425 | return 0; |
426 | } |
427 | |
428 | static int pcipcwd_get_timeleft(int *time_left) |
429 | { |
430 | int msb; |
431 | int lsb; |
432 | |
433 | /* Read the time that's left before rebooting */ |
434 | /* Note: if the board is not yet armed then we will read 0xFFFF */ |
435 | send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); |
436 | |
437 | *time_left = (msb << 8) + lsb; |
438 | |
439 | if (debug >= VERBOSE) |
440 | printk(KERN_DEBUG PFX "Time left before next reboot: %d\n", |
441 | *time_left); |
442 | |
443 | return 0; |
444 | } |
445 | |
446 | /* |
447 | * /dev/watchdog handling |
448 | */ |
449 | |
450 | static ssize_t pcipcwd_write(struct file *file, const char __user *data, |
451 | size_t len, loff_t *ppos) |
452 | { |
453 | /* See if we got the magic character 'V' and reload the timer */ |
454 | if (len) { |
455 | if (!nowayout) { |
456 | size_t i; |
457 | |
458 | /* note: just in case someone wrote the magic character |
459 | * five months ago... */ |
460 | expect_release = 0; |
461 | |
462 | /* scan to see whether or not we got the |
463 | * magic character */ |
464 | for (i = 0; i != len; i++) { |
465 | char c; |
466 | if (get_user(c, data + i)) |
467 | return -EFAULT; |
468 | if (c == 'V') |
469 | expect_release = 42; |
470 | } |
471 | } |
472 | |
473 | /* someone wrote to us, we should reload the timer */ |
474 | pcipcwd_keepalive(); |
475 | } |
476 | return len; |
477 | } |
478 | |
479 | static long pcipcwd_ioctl(struct file *file, unsigned int cmd, |
480 | unsigned long arg) |
481 | { |
482 | void __user *argp = (void __user *)arg; |
483 | int __user *p = argp; |
484 | static const struct watchdog_info ident = { |
485 | .options = WDIOF_OVERHEAT | |
486 | WDIOF_CARDRESET | |
487 | WDIOF_KEEPALIVEPING | |
488 | WDIOF_SETTIMEOUT | |
489 | WDIOF_MAGICCLOSE, |
490 | .firmware_version = 1, |
491 | .identity = WATCHDOG_DRIVER_NAME, |
492 | }; |
493 | |
494 | switch (cmd) { |
495 | case WDIOC_GETSUPPORT: |
496 | return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; |
497 | |
498 | case WDIOC_GETSTATUS: |
499 | { |
500 | int status; |
501 | pcipcwd_get_status(&status); |
502 | return put_user(status, p); |
503 | } |
504 | |
505 | case WDIOC_GETBOOTSTATUS: |
506 | return put_user(pcipcwd_private.boot_status, p); |
507 | |
508 | case WDIOC_GETTEMP: |
509 | { |
510 | int temperature; |
511 | |
512 | if (pcipcwd_get_temperature(&temperature)) |
513 | return -EFAULT; |
514 | |
515 | return put_user(temperature, p); |
516 | } |
517 | |
518 | case WDIOC_SETOPTIONS: |
519 | { |
520 | int new_options, retval = -EINVAL; |
521 | |
522 | if (get_user(new_options, p)) |
523 | return -EFAULT; |
524 | |
525 | if (new_options & WDIOS_DISABLECARD) { |
526 | if (pcipcwd_stop()) |
527 | return -EIO; |
528 | retval = 0; |
529 | } |
530 | |
531 | if (new_options & WDIOS_ENABLECARD) { |
532 | if (pcipcwd_start()) |
533 | return -EIO; |
534 | retval = 0; |
535 | } |
536 | |
537 | if (new_options & WDIOS_TEMPPANIC) { |
538 | temp_panic = 1; |
539 | retval = 0; |
540 | } |
541 | |
542 | return retval; |
543 | } |
544 | |
545 | case WDIOC_KEEPALIVE: |
546 | pcipcwd_keepalive(); |
547 | return 0; |
548 | |
549 | case WDIOC_SETTIMEOUT: |
550 | { |
551 | int new_heartbeat; |
552 | |
553 | if (get_user(new_heartbeat, p)) |
554 | return -EFAULT; |
555 | |
556 | if (pcipcwd_set_heartbeat(new_heartbeat)) |
557 | return -EINVAL; |
558 | |
559 | pcipcwd_keepalive(); |
560 | /* Fall */ |
561 | } |
562 | |
563 | case WDIOC_GETTIMEOUT: |
564 | return put_user(heartbeat, p); |
565 | |
566 | case WDIOC_GETTIMELEFT: |
567 | { |
568 | int time_left; |
569 | |
570 | if (pcipcwd_get_timeleft(&time_left)) |
571 | return -EFAULT; |
572 | |
573 | return put_user(time_left, p); |
574 | } |
575 | |
576 | default: |
577 | return -ENOTTY; |
578 | } |
579 | } |
580 | |
581 | static int pcipcwd_open(struct inode *inode, struct file *file) |
582 | { |
583 | /* /dev/watchdog can only be opened once */ |
584 | if (test_and_set_bit(0, &is_active)) { |
585 | if (debug >= VERBOSE) |
586 | printk(KERN_ERR PFX |
587 | "Attempt to open already opened device.\n"); |
588 | return -EBUSY; |
589 | } |
590 | |
591 | /* Activate */ |
592 | pcipcwd_start(); |
593 | pcipcwd_keepalive(); |
594 | return nonseekable_open(inode, file); |
595 | } |
596 | |
597 | static int pcipcwd_release(struct inode *inode, struct file *file) |
598 | { |
599 | /* |
600 | * Shut off the timer. |
601 | */ |
602 | if (expect_release == 42) { |
603 | pcipcwd_stop(); |
604 | } else { |
605 | printk(KERN_CRIT PFX |
606 | "Unexpected close, not stopping watchdog!\n"); |
607 | pcipcwd_keepalive(); |
608 | } |
609 | expect_release = 0; |
610 | clear_bit(0, &is_active); |
611 | return 0; |
612 | } |
613 | |
614 | /* |
615 | * /dev/temperature handling |
616 | */ |
617 | |
618 | static ssize_t pcipcwd_temp_read(struct file *file, char __user *data, |
619 | size_t len, loff_t *ppos) |
620 | { |
621 | int temperature; |
622 | |
623 | if (pcipcwd_get_temperature(&temperature)) |
624 | return -EFAULT; |
625 | |
626 | if (copy_to_user(data, &temperature, 1)) |
627 | return -EFAULT; |
628 | |
629 | return 1; |
630 | } |
631 | |
632 | static int pcipcwd_temp_open(struct inode *inode, struct file *file) |
633 | { |
634 | if (!pcipcwd_private.supports_temp) |
635 | return -ENODEV; |
636 | |
637 | return nonseekable_open(inode, file); |
638 | } |
639 | |
640 | static int pcipcwd_temp_release(struct inode *inode, struct file *file) |
641 | { |
642 | return 0; |
643 | } |
644 | |
645 | /* |
646 | * Notify system |
647 | */ |
648 | |
649 | static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, |
650 | void *unused) |
651 | { |
652 | if (code == SYS_DOWN || code == SYS_HALT) |
653 | pcipcwd_stop(); /* Turn the WDT off */ |
654 | |
655 | return NOTIFY_DONE; |
656 | } |
657 | |
658 | /* |
659 | * Kernel Interfaces |
660 | */ |
661 | |
662 | static const struct file_operations pcipcwd_fops = { |
663 | .owner = THIS_MODULE, |
664 | .llseek = no_llseek, |
665 | .write = pcipcwd_write, |
666 | .unlocked_ioctl = pcipcwd_ioctl, |
667 | .open = pcipcwd_open, |
668 | .release = pcipcwd_release, |
669 | }; |
670 | |
671 | static struct miscdevice pcipcwd_miscdev = { |
672 | .minor = WATCHDOG_MINOR, |
673 | .name = "watchdog", |
674 | .fops = &pcipcwd_fops, |
675 | }; |
676 | |
677 | static const struct file_operations pcipcwd_temp_fops = { |
678 | .owner = THIS_MODULE, |
679 | .llseek = no_llseek, |
680 | .read = pcipcwd_temp_read, |
681 | .open = pcipcwd_temp_open, |
682 | .release = pcipcwd_temp_release, |
683 | }; |
684 | |
685 | static struct miscdevice pcipcwd_temp_miscdev = { |
686 | .minor = TEMP_MINOR, |
687 | .name = "temperature", |
688 | .fops = &pcipcwd_temp_fops, |
689 | }; |
690 | |
691 | static struct notifier_block pcipcwd_notifier = { |
692 | .notifier_call = pcipcwd_notify_sys, |
693 | }; |
694 | |
695 | /* |
696 | * Init & exit routines |
697 | */ |
698 | |
699 | static int __devinit pcipcwd_card_init(struct pci_dev *pdev, |
700 | const struct pci_device_id *ent) |
701 | { |
702 | int ret = -EIO; |
703 | |
704 | cards_found++; |
705 | if (cards_found == 1) |
706 | printk(KERN_INFO PFX DRIVER_VERSION); |
707 | |
708 | if (cards_found > 1) { |
709 | printk(KERN_ERR PFX "This driver only supports 1 device\n"); |
710 | return -ENODEV; |
711 | } |
712 | |
713 | if (pci_enable_device(pdev)) { |
714 | printk(KERN_ERR PFX "Not possible to enable PCI Device\n"); |
715 | return -ENODEV; |
716 | } |
717 | |
718 | if (pci_resource_start(pdev, 0) == 0x0000) { |
719 | printk(KERN_ERR PFX "No I/O-Address for card detected\n"); |
720 | ret = -ENODEV; |
721 | goto err_out_disable_device; |
722 | } |
723 | |
724 | pcipcwd_private.pdev = pdev; |
725 | pcipcwd_private.io_addr = pci_resource_start(pdev, 0); |
726 | |
727 | if (pci_request_regions(pdev, WATCHDOG_NAME)) { |
728 | printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", |
729 | (int) pcipcwd_private.io_addr); |
730 | ret = -EIO; |
731 | goto err_out_disable_device; |
732 | } |
733 | |
734 | /* get the boot_status */ |
735 | pcipcwd_get_status(&pcipcwd_private.boot_status); |
736 | |
737 | /* clear the "card caused reboot" flag */ |
738 | pcipcwd_clear_status(); |
739 | |
740 | /* disable card */ |
741 | pcipcwd_stop(); |
742 | |
743 | /* Check whether or not the card supports the temperature device */ |
744 | pcipcwd_check_temperature_support(); |
745 | |
746 | /* Show info about the card itself */ |
747 | pcipcwd_show_card_info(); |
748 | |
749 | /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ |
750 | if (heartbeat == 0) |
751 | heartbeat = |
752 | heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)]; |
753 | |
754 | /* Check that the heartbeat value is within it's range ; |
755 | * if not reset to the default */ |
756 | if (pcipcwd_set_heartbeat(heartbeat)) { |
757 | pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT); |
758 | printk(KERN_INFO PFX |
759 | "heartbeat value must be 0<heartbeat<65536, using %d\n", |
760 | WATCHDOG_HEARTBEAT); |
761 | } |
762 | |
763 | ret = register_reboot_notifier(&pcipcwd_notifier); |
764 | if (ret != 0) { |
765 | printk(KERN_ERR PFX |
766 | "cannot register reboot notifier (err=%d)\n", ret); |
767 | goto err_out_release_region; |
768 | } |
769 | |
770 | if (pcipcwd_private.supports_temp) { |
771 | ret = misc_register(&pcipcwd_temp_miscdev); |
772 | if (ret != 0) { |
773 | printk(KERN_ERR PFX "cannot register miscdev on " |
774 | "minor=%d (err=%d)\n", TEMP_MINOR, ret); |
775 | goto err_out_unregister_reboot; |
776 | } |
777 | } |
778 | |
779 | ret = misc_register(&pcipcwd_miscdev); |
780 | if (ret != 0) { |
781 | printk(KERN_ERR PFX |
782 | "cannot register miscdev on minor=%d (err=%d)\n", |
783 | WATCHDOG_MINOR, ret); |
784 | goto err_out_misc_deregister; |
785 | } |
786 | |
787 | printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", |
788 | heartbeat, nowayout); |
789 | |
790 | return 0; |
791 | |
792 | err_out_misc_deregister: |
793 | if (pcipcwd_private.supports_temp) |
794 | misc_deregister(&pcipcwd_temp_miscdev); |
795 | err_out_unregister_reboot: |
796 | unregister_reboot_notifier(&pcipcwd_notifier); |
797 | err_out_release_region: |
798 | pci_release_regions(pdev); |
799 | err_out_disable_device: |
800 | pci_disable_device(pdev); |
801 | return ret; |
802 | } |
803 | |
804 | static void __devexit pcipcwd_card_exit(struct pci_dev *pdev) |
805 | { |
806 | /* Stop the timer before we leave */ |
807 | if (!nowayout) |
808 | pcipcwd_stop(); |
809 | |
810 | /* Deregister */ |
811 | misc_deregister(&pcipcwd_miscdev); |
812 | if (pcipcwd_private.supports_temp) |
813 | misc_deregister(&pcipcwd_temp_miscdev); |
814 | unregister_reboot_notifier(&pcipcwd_notifier); |
815 | pci_release_regions(pdev); |
816 | pci_disable_device(pdev); |
817 | cards_found--; |
818 | } |
819 | |
820 | static struct pci_device_id pcipcwd_pci_tbl[] = { |
821 | { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD, |
822 | PCI_ANY_ID, PCI_ANY_ID, }, |
823 | { 0 }, /* End of list */ |
824 | }; |
825 | MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl); |
826 | |
827 | static struct pci_driver pcipcwd_driver = { |
828 | .name = WATCHDOG_NAME, |
829 | .id_table = pcipcwd_pci_tbl, |
830 | .probe = pcipcwd_card_init, |
831 | .remove = __devexit_p(pcipcwd_card_exit), |
832 | }; |
833 | |
834 | static int __init pcipcwd_init_module(void) |
835 | { |
836 | spin_lock_init(&pcipcwd_private.io_lock); |
837 | |
838 | return pci_register_driver(&pcipcwd_driver); |
839 | } |
840 | |
841 | static void __exit pcipcwd_cleanup_module(void) |
842 | { |
843 | pci_unregister_driver(&pcipcwd_driver); |
844 | |
845 | printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); |
846 | } |
847 | |
848 | module_init(pcipcwd_init_module); |
849 | module_exit(pcipcwd_cleanup_module); |
850 | |
851 | MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>"); |
852 | MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver"); |
853 | MODULE_LICENSE("GPL"); |
854 | MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); |
855 | MODULE_ALIAS_MISCDEV(TEMP_MINOR); |
856 |
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