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