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