Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/watchdog/pcwd_pci.c

  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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
626 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
627 {
628         return 0;
629 }
630 
631 /*
632  *      Notify system
633  */
634 
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 
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 
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 

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