drivers/char/watchdog/pcwd_pci.c

   1 /*
   2  *      Berkshire PCI-PC Watchdog Card Driver
   3  *
   4  *      (c) Copyright 2003 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 http://www.pcwd.de/
  25  *      More info available at http://www.berkprod.com/ or http://www.pcwatchdog.com/
  26  */
  27
  28 /*
  29  *      Includes, defines, variables, module parameters, ...
  30  */
  31
  32 #include <linux/config.h>       /* For CONFIG_WATCHDOG_NOWAYOUT/... */
  33 #include <linux/module.h>       /* For module specific items */
  34 #include <linux/moduleparam.h>  /* For new moduleparam's */
  35 #include <linux/types.h>        /* For standard types (like size_t) */
  36 #include <linux/errno.h>        /* For the -ENODEV/... values */
  37 #include <linux/kernel.h>       /* For printk/panic/... */
  38 #include <linux/delay.h>        /* For mdelay function */
  39 #include <linux/miscdevice.h>   /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
  40 #include <linux/watchdog.h>     /* For the watchdog specific items */
  41 #include <linux/notifier.h>     /* For notifier support */
  42 #include <linux/reboot.h>       /* For reboot_notifier stuff */
  43 #include <linux/init.h>         /* For __init/__exit/... */
  44 #include <linux/fs.h>           /* For file operations */
  45 #include <linux/pci.h>          /* For pci functions */
  46 #include <linux/ioport.h>       /* For io-port access */
  47 #include <linux/spinlock.h>     /* For spin_lock/spin_unlock/... */
  48
  49 #include <asm/uaccess.h>        /* For copy_to_user/put_user/... */
  50 #include <asm/io.h>             /* For inb/outb/... */
  51
  52 /* Module and version information */
  53 #define WATCHDOG_VERSION "1.02"
  54 #define WATCHDOG_DATE "03 Sep 2005"
  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 /* We can only use 1 card due to the /dev/watchdog restriction */
  99 static int cards_found;
 100
 101 /* internal variables */
 102 static int temp_panic;
 103 static unsigned long is_active;
 104 static char expect_release;
 105 static struct {                         /* this is private data for each PCI-PC watchdog card */
 106         int supports_temp;              /* Wether or not the card has a temperature device */
 107         int boot_status;                /* The card's boot status */
 108         unsigned long io_addr;          /* The cards I/O address */
 109         spinlock_t io_lock;             /* the lock for io operations */
 110         struct pci_dev *pdev;           /* the PCI-device */
 111 } pcipcwd_private;
 112
 113 /* module parameters */
 114 #define QUIET   0       /* Default */
 115 #define VERBOSE 1       /* Verbose */
 116 #define DEBUG   2       /* print fancy stuff too */
 117 static int debug = QUIET;
 118 module_param(debug, int, 0);
 119 MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
 120
 121 #define WATCHDOG_HEARTBEAT 2    /* 2 sec default heartbeat */
 122 static int heartbeat = WATCHDOG_HEARTBEAT;
 123 module_param(heartbeat, int, 0);
 124 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 125
 126 static int nowayout = WATCHDOG_NOWAYOUT;
 127 module_param(nowayout, int, 0);
 128 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
 129
 130 /*
 131  *      Internal functions
 132  */
 133
 134 static int send_command(int cmd, int *msb, int *lsb)
 135 {
 136         int got_response, count;
 137
 138         if (debug >= DEBUG)
 139                 printk(KERN_DEBUG PFX "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
 140                 cmd, *msb, *lsb);
 141
 142         spin_lock(&pcipcwd_private.io_lock);
 143         /* If a command requires data it should be written first.
 144          * Data for commands with 8 bits of data should be written to port 4.
 145          * Commands with 16 bits of data, should be written as LSB to port 4
 146          * and MSB to port 5.
 147          * After the required data has been written then write the command to
 148          * port 6. */
 149         outb_p(*lsb, pcipcwd_private.io_addr + 4);
 150         outb_p(*msb, pcipcwd_private.io_addr + 5);
 151         outb_p(cmd, pcipcwd_private.io_addr + 6);
 152
 153         /* wait till the pci card processed the command, signaled by
 154          * the WRSP bit in port 2 and give it a max. timeout of
 155          * PCI_COMMAND_TIMEOUT to process */
 156         got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 157         for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
 158                 mdelay(1);
 159                 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 160         }
 161
 162         if (debug >= DEBUG) {
 163                 if (got_response) {
 164                         printk(KERN_DEBUG PFX "time to process command was: %d ms\n",
 165                                 count);
 166                 } else {
 167                         printk(KERN_DEBUG PFX "card did not respond on command!\n");
 168                 }
 169         }
 170
 171         if (got_response) {
 172                 /* read back response */
 173                 *lsb = inb_p(pcipcwd_private.io_addr + 4);
 174                 *msb = inb_p(pcipcwd_private.io_addr + 5);
 175
 176                 /* clear WRSP bit */
 177                 inb_p(pcipcwd_private.io_addr + 6);
 178
 179                 if (debug >= DEBUG)
 180                         printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
 181                                 cmd, *msb, *lsb);
 182         }
 183
 184         spin_unlock(&pcipcwd_private.io_lock);
 185
 186         return got_response;
 187 }
 188
 189 static inline void pcipcwd_check_temperature_support(void)
 190 {
 191         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 192                 pcipcwd_private.supports_temp = 1;
 193 }
 194
 195 static int pcipcwd_get_option_switches(void)
 196 {
 197         int option_switches;
 198
 199         option_switches = inb_p(pcipcwd_private.io_addr + 3);
 200         return option_switches;
 201 }
 202
 203 static void pcipcwd_show_card_info(void)
 204 {
 205         int got_fw_rev, fw_rev_major, fw_rev_minor;
 206         char fw_ver_str[20];            /* The cards firmware version */
 207         int option_switches;
 208
 209         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
 210         if (got_fw_rev) {
 211                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 212         } else {
 213                 sprintf(fw_ver_str, "<card no answer>");
 214         }
 215
 216         /* Get switch settings */
 217         option_switches = pcipcwd_get_option_switches();
 218
 219         printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
 220                 (int) pcipcwd_private.io_addr, fw_ver_str,
 221                 (pcipcwd_private.supports_temp ? "with" : "without"));
 222
 223         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 224                 option_switches,
 225                 ((option_switches & 0x10) ? "ON" : "OFF"),
 226                 ((option_switches & 0x08) ? "ON" : "OFF"));
 227
 228         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 229                 printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
 230
 231         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 232                 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 233
 234         if (pcipcwd_private.boot_status == 0)
 235                 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
 236 }
 237
 238 static int pcipcwd_start(void)
 239 {
 240         int stat_reg;
 241
 242         spin_lock(&pcipcwd_private.io_lock);
 243         outb_p(0x00, pcipcwd_private.io_addr + 3);
 244         udelay(1000);
 245
 246         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 247         spin_unlock(&pcipcwd_private.io_lock);
 248
 249         if (stat_reg & WD_PCI_WDIS) {
 250                 printk(KERN_ERR PFX "Card timer not enabled\n");
 251                 return -1;
 252         }
 253
 254         if (debug >= VERBOSE)
 255                 printk(KERN_DEBUG PFX "Watchdog started\n");
 256
 257         return 0;
 258 }
 259
 260 static int pcipcwd_stop(void)
 261 {
 262         int stat_reg;
 263
 264         spin_lock(&pcipcwd_private.io_lock);
 265         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 266         udelay(1000);
 267
 268         outb_p(0xA5, 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                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
 276                 return -1;
 277         }
 278
 279         if (debug >= VERBOSE)
 280                 printk(KERN_DEBUG PFX "Watchdog stopped\n");
 281
 282         return 0;
 283 }
 284
 285 static int pcipcwd_keepalive(void)
 286 {
 287         /* Re-trigger watchdog by writing to port 0 */
 288         outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
 289
 290         if (debug >= DEBUG)
 291                 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
 292
 293         return 0;
 294 }
 295
 296 static int pcipcwd_set_heartbeat(int t)
 297 {
 298         int t_msb = t / 256;
 299         int t_lsb = t % 256;
 300
 301         if ((t < 0x0001) || (t > 0xFFFF))
 302                 return -EINVAL;
 303
 304         /* Write new heartbeat to watchdog */
 305         send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 306
 307         heartbeat = t;
 308         if (debug >= VERBOSE)
 309                 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
 310                        heartbeat);
 311
 312         return 0;
 313 }
 314
 315 static int pcipcwd_get_status(int *status)
 316 {
 317         int control_status;
 318
 319         *status=0;
 320         control_status = inb_p(pcipcwd_private.io_addr + 1);
 321         if (control_status & WD_PCI_WTRP)
 322                 *status |= WDIOF_CARDRESET;
 323         if (control_status & WD_PCI_TTRP) {
 324                 *status |= WDIOF_OVERHEAT;
 325                 if (temp_panic)
 326                         panic(PFX "Temperature overheat trip!\n");
 327         }
 328
 329         if (debug >= DEBUG)
 330                 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
 331                        control_status);
 332
 333         return 0;
 334 }
 335
 336 static int pcipcwd_clear_status(void)
 337 {
 338         int control_status;
 339         int msb;
 340         int reset_counter;
 341
 342         if (debug >= VERBOSE)
 343                 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
 344
 345         control_status = inb_p(pcipcwd_private.io_addr + 1);
 346
 347         if (debug >= DEBUG) {
 348                 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
 349                 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
 350                        (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
 351         }
 352
 353         /* clear trip status & LED and keep mode of relay 2 */
 354         outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1);
 355
 356         /* clear reset counter */
 357         msb=0;
 358         reset_counter=0xff;
 359         send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
 360
 361         if (debug >= DEBUG) {
 362                 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
 363                        reset_counter);
 364         }
 365
 366         return 0;
 367 }
 368
 369 static int pcipcwd_get_temperature(int *temperature)
 370 {
 371         *temperature = 0;
 372         if (!pcipcwd_private.supports_temp)
 373                 return -ENODEV;
 374
 375         *temperature = inb_p(pcipcwd_private.io_addr);
 376
 377         /*
 378          * Convert celsius to fahrenheit, since this was
 379          * the decided 'standard' for this return value.
 380          */
 381         *temperature = (*temperature * 9 / 5) + 32;
 382
 383         if (debug >= DEBUG) {
 384                 printk(KERN_DEBUG PFX "temperature is: %d F\n",
 385                        *temperature);
 386         }
 387
 388         return 0;
 389 }
 390
 391 /*
 392  *      /dev/watchdog handling
 393  */
 394
 395 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 396                              size_t len, loff_t *ppos)
 397 {
 398         /* See if we got the magic character 'V' and reload the timer */
 399         if (len) {
 400                 if (!nowayout) {
 401                         size_t i;
 402
 403                         /* note: just in case someone wrote the magic character
 404                          * five months ago... */
 405                         expect_release = 0;
 406
 407                         /* scan to see whether or not we got the magic character */
 408                         for (i = 0; i != len; i++) {
 409                                 char c;
 410                                 if(get_user(c, data+i))
 411                                         return -EFAULT;
 412                                 if (c == 'V')
 413                                         expect_release = 42;
 414                         }
 415                 }
 416
 417                 /* someone wrote to us, we should reload the timer */
 418                 pcipcwd_keepalive();
 419         }
 420         return len;
 421 }
 422
 423 static int pcipcwd_ioctl(struct inode *inode, struct file *file,
 424                           unsigned int cmd, unsigned long arg)
 425 {
 426         void __user *argp = (void __user *)arg;
 427         int __user *p = argp;
 428         static struct watchdog_info ident = {
 429                 .options =              WDIOF_OVERHEAT |
 430                                         WDIOF_CARDRESET |
 431                                         WDIOF_KEEPALIVEPING |
 432                                         WDIOF_SETTIMEOUT |
 433                                         WDIOF_MAGICCLOSE,
 434                 .firmware_version =     1,
 435                 .identity =             WATCHDOG_DRIVER_NAME,
 436         };
 437
 438         switch (cmd) {
 439                 case WDIOC_GETSUPPORT:
 440                         return copy_to_user(argp, &ident,
 441                                 sizeof (ident)) ? -EFAULT : 0;
 442
 443                 case WDIOC_GETSTATUS:
 444                 {
 445                         int status;
 446
 447                         pcipcwd_get_status(&status);
 448
 449                         return put_user(status, p);
 450                 }
 451
 452                 case WDIOC_GETBOOTSTATUS:
 453                         return put_user(pcipcwd_private.boot_status, p);
 454
 455                 case WDIOC_GETTEMP:
 456                 {
 457                         int temperature;
 458
 459                         if (pcipcwd_get_temperature(&temperature))
 460                                 return -EFAULT;
 461
 462                         return put_user(temperature, p);
 463                 }
 464
 465                 case WDIOC_KEEPALIVE:
 466                         pcipcwd_keepalive();
 467                         return 0;
 468
 469                 case WDIOC_SETOPTIONS:
 470                 {
 471                         int new_options, retval = -EINVAL;
 472
 473                         if (get_user (new_options, p))
 474                                 return -EFAULT;
 475
 476                         if (new_options & WDIOS_DISABLECARD) {
 477                                 if (pcipcwd_stop())
 478                                         return -EIO;
 479                                 retval = 0;
 480                         }
 481
 482                         if (new_options & WDIOS_ENABLECARD) {
 483                                 if (pcipcwd_start())
 484                                         return -EIO;
 485                                 retval = 0;
 486                         }
 487
 488                         if (new_options & WDIOS_TEMPPANIC) {
 489                                 temp_panic = 1;
 490                                 retval = 0;
 491                         }
 492
 493                         return retval;
 494                 }
 495
 496                 case WDIOC_SETTIMEOUT:
 497                 {
 498                         int new_heartbeat;
 499
 500                         if (get_user(new_heartbeat, p))
 501                                 return -EFAULT;
 502
 503                         if (pcipcwd_set_heartbeat(new_heartbeat))
 504                             return -EINVAL;
 505
 506                         pcipcwd_keepalive();
 507                         /* Fall */
 508                 }
 509
 510                 case WDIOC_GETTIMEOUT:
 511                         return put_user(heartbeat, p);
 512
 513                 default:
 514                         return -ENOIOCTLCMD;
 515         }
 516 }
 517
 518 static int pcipcwd_open(struct inode *inode, struct file *file)
 519 {
 520         /* /dev/watchdog can only be opened once */
 521         if (test_and_set_bit(0, &is_active)) {
 522                 if (debug >= VERBOSE)
 523                         printk(KERN_ERR PFX "Attempt to open already opened device.\n");
 524                 return -EBUSY;
 525         }
 526
 527         /* Activate */
 528         pcipcwd_start();
 529         pcipcwd_keepalive();
 530         return nonseekable_open(inode, file);
 531 }
 532
 533 static int pcipcwd_release(struct inode *inode, struct file *file)
 534 {
 535         /*
 536          *      Shut off the timer.
 537          */
 538         if (expect_release == 42) {
 539                 pcipcwd_stop();
 540         } else {
 541                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
 542                 pcipcwd_keepalive();
 543         }
 544         expect_release = 0;
 545         clear_bit(0, &is_active);
 546         return 0;
 547 }
 548
 549 /*
 550  *      /dev/temperature handling
 551  */
 552
 553 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 554                                 size_t len, loff_t *ppos)
 555 {
 556         int temperature;
 557
 558         if (pcipcwd_get_temperature(&temperature))
 559                 return -EFAULT;
 560
 561         if (copy_to_user (data, &temperature, 1))
 562                 return -EFAULT;
 563
 564         return 1;
 565 }
 566
 567 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 568 {
 569         if (!pcipcwd_private.supports_temp)
 570                 return -ENODEV;
 571
 572         return nonseekable_open(inode, file);
 573 }
 574
 575 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 576 {
 577         return 0;
 578 }
 579
 580 /*
 581  *      Notify system
 582  */
 583
 584 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
 585 {
 586         if (code==SYS_DOWN || code==SYS_HALT) {
 587                 /* Turn the WDT off */
 588                 pcipcwd_stop();
 589         }
 590
 591         return NOTIFY_DONE;
 592 }
 593
 594 /*
 595  *      Kernel Interfaces
 596  */
 597
 598 static struct file_operations pcipcwd_fops = {
 599         .owner =        THIS_MODULE,
 600         .llseek =       no_llseek,
 601         .write =        pcipcwd_write,
 602         .ioctl =        pcipcwd_ioctl,
 603         .open =         pcipcwd_open,
 604         .release =      pcipcwd_release,
 605 };
 606
 607 static struct miscdevice pcipcwd_miscdev = {
 608         .minor =        WATCHDOG_MINOR,
 609         .name =         "watchdog",
 610         .fops =         &pcipcwd_fops,
 611 };
 612
 613 static struct file_operations pcipcwd_temp_fops = {
 614         .owner =        THIS_MODULE,
 615         .llseek =       no_llseek,
 616         .read =         pcipcwd_temp_read,
 617         .open =         pcipcwd_temp_open,
 618         .release =      pcipcwd_temp_release,
 619 };
 620
 621 static struct miscdevice pcipcwd_temp_miscdev = {
 622         .minor =        TEMP_MINOR,
 623         .name =         "temperature",
 624         .fops =         &pcipcwd_temp_fops,
 625 };
 626
 627 static struct notifier_block pcipcwd_notifier = {
 628         .notifier_call =        pcipcwd_notify_sys,
 629 };
 630
 631 /*
 632  *      Init & exit routines
 633  */
 634
 635 static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 636                 const struct pci_device_id *ent)
 637 {
 638         int ret = -EIO;
 639
 640         cards_found++;
 641         if (cards_found == 1)
 642                 printk(KERN_INFO PFX DRIVER_VERSION);
 643
 644         if (cards_found > 1) {
 645                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
 646                 return -ENODEV;
 647         }
 648
 649         if (pci_enable_device(pdev)) {
 650                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 651                 return -ENODEV;
 652         }
 653
 654         if (pci_resource_start(pdev, 0) == 0x0000) {
 655                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 656                 ret = -ENODEV;
 657                 goto err_out_disable_device;
 658         }
 659
 660         pcipcwd_private.pdev = pdev;
 661         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 662
 663         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 664                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 665                         (int) pcipcwd_private.io_addr);
 666                 ret = -EIO;
 667                 goto err_out_disable_device;
 668         }
 669
 670         /* get the boot_status */
 671         pcipcwd_get_status(&pcipcwd_private.boot_status);
 672
 673         /* clear the "card caused reboot" flag */
 674         pcipcwd_clear_status();
 675
 676         /* disable card */
 677         pcipcwd_stop();
 678
 679         /* Check whether or not the card supports the temperature device */
 680         pcipcwd_check_temperature_support();
 681
 682         /* Show info about the card itself */
 683         pcipcwd_show_card_info();
 684
 685         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 686         if (pcipcwd_set_heartbeat(heartbeat)) {
 687                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 688                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 689                         WATCHDOG_HEARTBEAT);
 690         }
 691
 692         ret = register_reboot_notifier(&pcipcwd_notifier);
 693         if (ret != 0) {
 694                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 695                         ret);
 696                 goto err_out_release_region;
 697         }
 698
 699         if (pcipcwd_private.supports_temp) {
 700                 ret = misc_register(&pcipcwd_temp_miscdev);
 701                 if (ret != 0) {
 702                         printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 703                                 TEMP_MINOR, ret);
 704                         goto err_out_unregister_reboot;
 705                 }
 706         }
 707
 708         ret = misc_register(&pcipcwd_miscdev);
 709         if (ret != 0) {
 710                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 711                         WATCHDOG_MINOR, ret);
 712                 goto err_out_misc_deregister;
 713         }
 714
 715         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 716                 heartbeat, nowayout);
 717
 718         return 0;
 719
 720 err_out_misc_deregister:
 721         if (pcipcwd_private.supports_temp)
 722                 misc_deregister(&pcipcwd_temp_miscdev);
 723 err_out_unregister_reboot:
 724         unregister_reboot_notifier(&pcipcwd_notifier);
 725 err_out_release_region:
 726         pci_release_regions(pdev);
 727 err_out_disable_device:
 728         pci_disable_device(pdev);
 729         return ret;
 730 }
 731
 732 static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 733 {
 734         /* Stop the timer before we leave */
 735         if (!nowayout)
 736                 pcipcwd_stop();
 737
 738         /* Deregister */
 739         misc_deregister(&pcipcwd_miscdev);
 740         if (pcipcwd_private.supports_temp)
 741                 misc_deregister(&pcipcwd_temp_miscdev);
 742         unregister_reboot_notifier(&pcipcwd_notifier);
 743         pci_release_regions(pdev);
 744         pci_disable_device(pdev);
 745         cards_found--;
 746 }
 747
 748 static struct pci_device_id pcipcwd_pci_tbl[] = {
 749         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 750                 PCI_ANY_ID, PCI_ANY_ID, },
 751         { 0 },                  /* End of list */
 752 };
 753 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 754
 755 static struct pci_driver pcipcwd_driver = {
 756         .name           = WATCHDOG_NAME,
 757         .id_table       = pcipcwd_pci_tbl,
 758         .probe          = pcipcwd_card_init,
 759         .remove         = __devexit_p(pcipcwd_card_exit),
 760 };
 761
 762 static int __init pcipcwd_init_module(void)
 763 {
 764         spin_lock_init(&pcipcwd_private.io_lock);
 765
 766         return pci_register_driver(&pcipcwd_driver);
 767 }
 768
 769 static void __exit pcipcwd_cleanup_module(void)
 770 {
 771         pci_unregister_driver(&pcipcwd_driver);
 772 }
 773
 774 module_init(pcipcwd_init_module);
 775 module_exit(pcipcwd_cleanup_module);
 776
 777 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 778 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 779 MODULE_LICENSE("GPL");
 780 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 781 MODULE_ALIAS_MISCDEV(TEMP_MINOR);