drivers/char/watchdog/pcwd_pci.c

   1 /*
   2  *      Berkshire PCI-PC Watchdog Card Driver
   3  *
   4  *      (c) Copyright 2003-2005 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
  50 #include <asm/uaccess.h>        /* For copy_to_user/put_user/... */
  51 #include <asm/io.h>             /* For inb/outb/... */
  52
  53 /* Module and version information */
  54 #define WATCHDOG_VERSION "1.02"
  55 #define WATCHDOG_DATE "03 Sep 2005"
  56 #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
  57 #define WATCHDOG_NAME "pcwd_pci"
  58 #define PFX WATCHDOG_NAME ": "
  59 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
  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/reset */
  81 #define WD_PCI_RLY2             0x80    /* Activate Relay 2 on the board */
  82 /* Port 2 : Control Status #2 */
  83 #define WD_PCI_WDIS             0x10    /* Watchdog Disable */
  84 #define WD_PCI_ENTP             0x20    /* Enable Temperature Trip Reset */
  85 #define WD_PCI_WRSP             0x40    /* Watchdog wrote response */
  86 #define WD_PCI_PCMD             0x80    /* PC has sent command */
  87
  88 /* according to documentation max. time to process a command for the pci
  89  * watchdog card is 100 ms, so we give it 150 ms to do it's job */
  90 #define PCI_COMMAND_TIMEOUT     150
  91
  92 /* Watchdog's internal commands */
  93 #define CMD_GET_STATUS                          0x04
  94 #define CMD_GET_FIRMWARE_VERSION                0x08
  95 #define CMD_READ_WATCHDOG_TIMEOUT               0x18
  96 #define CMD_WRITE_WATCHDOG_TIMEOUT              0x19
  97 #define CMD_GET_CLEAR_RESET_COUNT               0x84
  98
  99 /* We can only use 1 card due to the /dev/watchdog restriction */
 100 static int cards_found;
 101
 102 /* internal variables */
 103 static int temp_panic;
 104 static unsigned long is_active;
 105 static char expect_release;
 106 static struct {                         /* this is private data for each PCI-PC watchdog card */
 107         int supports_temp;              /* Wether or not the card has a temperature device */
 108         int boot_status;                /* The card's boot status */
 109         unsigned long io_addr;          /* The cards I/O address */
 110         spinlock_t io_lock;             /* the lock for io operations */
 111         struct pci_dev *pdev;           /* the PCI-device */
 112 } pcipcwd_private;
 113
 114 /* module parameters */
 115 #define QUIET   0       /* Default */
 116 #define VERBOSE 1       /* Verbose */
 117 #define DEBUG   2       /* print fancy stuff too */
 118 static int debug = QUIET;
 119 module_param(debug, int, 0);
 120 MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
 121
 122 #define WATCHDOG_HEARTBEAT 2    /* 2 sec default heartbeat */
 123 static int heartbeat = WATCHDOG_HEARTBEAT;
 124 module_param(heartbeat, int, 0);
 125 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 126
 127 static int nowayout = WATCHDOG_NOWAYOUT;
 128 module_param(nowayout, int, 0);
 129 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
 130
 131 /*
 132  *      Internal functions
 133  */
 134
 135 static int send_command(int cmd, int *msb, int *lsb)
 136 {
 137         int got_response, count;
 138
 139         if (debug >= DEBUG)
 140                 printk(KERN_DEBUG PFX "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
 141                 cmd, *msb, *lsb);
 142
 143         spin_lock(&pcipcwd_private.io_lock);
 144         /* If a command requires data it should be written first.
 145          * Data for commands with 8 bits of data should be written to port 4.
 146          * Commands with 16 bits of data, should be written as LSB to port 4
 147          * and MSB to port 5.
 148          * After the required data has been written then write the command to
 149          * port 6. */
 150         outb_p(*lsb, pcipcwd_private.io_addr + 4);
 151         outb_p(*msb, pcipcwd_private.io_addr + 5);
 152         outb_p(cmd, pcipcwd_private.io_addr + 6);
 153
 154         /* wait till the pci card processed the command, signaled by
 155          * the WRSP bit in port 2 and give it a max. timeout of
 156          * PCI_COMMAND_TIMEOUT to process */
 157         got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 158         for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
 159                 mdelay(1);
 160                 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 161         }
 162
 163         if (debug >= DEBUG) {
 164                 if (got_response) {
 165                         printk(KERN_DEBUG PFX "time to process command was: %d ms\n",
 166                                 count);
 167                 } else {
 168                         printk(KERN_DEBUG PFX "card did not respond on command!\n");
 169                 }
 170         }
 171
 172         if (got_response) {
 173                 /* read back response */
 174                 *lsb = inb_p(pcipcwd_private.io_addr + 4);
 175                 *msb = inb_p(pcipcwd_private.io_addr + 5);
 176
 177                 /* clear WRSP bit */
 178                 inb_p(pcipcwd_private.io_addr + 6);
 179
 180                 if (debug >= DEBUG)
 181                         printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
 182                                 cmd, *msb, *lsb);
 183         }
 184
 185         spin_unlock(&pcipcwd_private.io_lock);
 186
 187         return got_response;
 188 }
 189
 190 static inline void pcipcwd_check_temperature_support(void)
 191 {
 192         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 193                 pcipcwd_private.supports_temp = 1;
 194 }
 195
 196 static int pcipcwd_get_option_switches(void)
 197 {
 198         int option_switches;
 199
 200         option_switches = inb_p(pcipcwd_private.io_addr + 3);
 201         return option_switches;
 202 }
 203
 204 static void pcipcwd_show_card_info(void)
 205 {
 206         int got_fw_rev, fw_rev_major, fw_rev_minor;
 207         char fw_ver_str[20];            /* The cards firmware version */
 208         int option_switches;
 209
 210         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
 211         if (got_fw_rev) {
 212                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 213         } else {
 214                 sprintf(fw_ver_str, "<card no answer>");
 215         }
 216
 217         /* Get switch settings */
 218         option_switches = pcipcwd_get_option_switches();
 219
 220         printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
 221                 (int) pcipcwd_private.io_addr, fw_ver_str,
 222                 (pcipcwd_private.supports_temp ? "with" : "without"));
 223
 224         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 225                 option_switches,
 226                 ((option_switches & 0x10) ? "ON" : "OFF"),
 227                 ((option_switches & 0x08) ? "ON" : "OFF"));
 228
 229         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 230                 printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
 231
 232         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 233                 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 234
 235         if (pcipcwd_private.boot_status == 0)
 236                 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
 237 }
 238
 239 static int pcipcwd_start(void)
 240 {
 241         int stat_reg;
 242
 243         spin_lock(&pcipcwd_private.io_lock);
 244         outb_p(0x00, pcipcwd_private.io_addr + 3);
 245         udelay(1000);
 246
 247         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 248         spin_unlock(&pcipcwd_private.io_lock);
 249
 250         if (stat_reg & WD_PCI_WDIS) {
 251                 printk(KERN_ERR PFX "Card timer not enabled\n");
 252                 return -1;
 253         }
 254
 255         if (debug >= VERBOSE)
 256                 printk(KERN_DEBUG PFX "Watchdog started\n");
 257
 258         return 0;
 259 }
 260
 261 static int pcipcwd_stop(void)
 262 {
 263         int stat_reg;
 264
 265         spin_lock(&pcipcwd_private.io_lock);
 266         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 267         udelay(1000);
 268
 269         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 270         udelay(1000);
 271
 272         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 273         spin_unlock(&pcipcwd_private.io_lock);
 274
 275         if (!(stat_reg & WD_PCI_WDIS)) {
 276                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
 277                 return -1;
 278         }
 279
 280         if (debug >= VERBOSE)
 281                 printk(KERN_DEBUG PFX "Watchdog stopped\n");
 282
 283         return 0;
 284 }
 285
 286 static int pcipcwd_keepalive(void)
 287 {
 288         /* Re-trigger watchdog by writing to port 0 */
 289         outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
 290
 291         if (debug >= DEBUG)
 292                 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
 293
 294         return 0;
 295 }
 296
 297 static int pcipcwd_set_heartbeat(int t)
 298 {
 299         int t_msb = t / 256;
 300         int t_lsb = t % 256;
 301
 302         if ((t < 0x0001) || (t > 0xFFFF))
 303                 return -EINVAL;
 304
 305         /* Write new heartbeat to watchdog */
 306         send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 307
 308         heartbeat = t;
 309         if (debug >= VERBOSE)
 310                 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
 311                        heartbeat);
 312
 313         return 0;
 314 }
 315
 316 static int pcipcwd_get_status(int *status)
 317 {
 318         int control_status;
 319
 320         *status=0;
 321         control_status = inb_p(pcipcwd_private.io_addr + 1);
 322         if (control_status & WD_PCI_WTRP)
 323                 *status |= WDIOF_CARDRESET;
 324         if (control_status & WD_PCI_TTRP) {
 325                 *status |= WDIOF_OVERHEAT;
 326                 if (temp_panic)
 327                         panic(PFX "Temperature overheat trip!\n");
 328         }
 329
 330         if (debug >= DEBUG)
 331                 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
 332                        control_status);
 333
 334         return 0;
 335 }
 336
 337 static int pcipcwd_clear_status(void)
 338 {
 339         int control_status;
 340         int msb;
 341         int reset_counter;
 342
 343         if (debug >= VERBOSE)
 344                 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
 345
 346         control_status = inb_p(pcipcwd_private.io_addr + 1);
 347
 348         if (debug >= DEBUG) {
 349                 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
 350                 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
 351                        (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
 352         }
 353
 354         /* clear trip status & LED and keep mode of relay 2 */
 355         outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1);
 356
 357         /* clear reset counter */
 358         msb=0;
 359         reset_counter=0xff;
 360         send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
 361
 362         if (debug >= DEBUG) {
 363                 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
 364                        reset_counter);
 365         }
 366
 367         return 0;
 368 }
 369
 370 static int pcipcwd_get_temperature(int *temperature)
 371 {
 372         *temperature = 0;
 373         if (!pcipcwd_private.supports_temp)
 374                 return -ENODEV;
 375
 376         *temperature = inb_p(pcipcwd_private.io_addr);
 377
 378         /*
 379          * Convert celsius to fahrenheit, since this was
 380          * the decided 'standard' for this return value.
 381          */
 382         *temperature = (*temperature * 9 / 5) + 32;
 383
 384         if (debug >= DEBUG) {
 385                 printk(KERN_DEBUG PFX "temperature is: %d F\n",
 386                        *temperature);
 387         }
 388
 389         return 0;
 390 }
 391
 392 static int pcipcwd_get_timeleft(int *time_left)
 393 {
 394         int msb;
 395         int lsb;
 396
 397         /* Read the time that's left before rebooting */
 398         /* Note: if the board is not yet armed then we will read 0xFFFF */
 399         send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
 400
 401         *time_left = (msb << 8) + lsb;
 402
 403         if (debug >= VERBOSE)
 404                 printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
 405                        *time_left);
 406
 407         return 0;
 408 }
 409
 410 /*
 411  *      /dev/watchdog handling
 412  */
 413
 414 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 415                              size_t len, loff_t *ppos)
 416 {
 417         /* See if we got the magic character 'V' and reload the timer */
 418         if (len) {
 419                 if (!nowayout) {
 420                         size_t i;
 421
 422                         /* note: just in case someone wrote the magic character
 423                          * five months ago... */
 424                         expect_release = 0;
 425
 426                         /* scan to see whether or not we got the magic character */
 427                         for (i = 0; i != len; i++) {
 428                                 char c;
 429                                 if(get_user(c, data+i))
 430                                         return -EFAULT;
 431                                 if (c == 'V')
 432                                         expect_release = 42;
 433                         }
 434                 }
 435
 436                 /* someone wrote to us, we should reload the timer */
 437                 pcipcwd_keepalive();
 438         }
 439         return len;
 440 }
 441
 442 static int pcipcwd_ioctl(struct inode *inode, struct file *file,
 443                           unsigned int cmd, unsigned long arg)
 444 {
 445         void __user *argp = (void __user *)arg;
 446         int __user *p = argp;
 447         static struct watchdog_info ident = {
 448                 .options =              WDIOF_OVERHEAT |
 449                                         WDIOF_CARDRESET |
 450                                         WDIOF_KEEPALIVEPING |
 451                                         WDIOF_SETTIMEOUT |
 452                                         WDIOF_MAGICCLOSE,
 453                 .firmware_version =     1,
 454                 .identity =             WATCHDOG_DRIVER_NAME,
 455         };
 456
 457         switch (cmd) {
 458                 case WDIOC_GETSUPPORT:
 459                         return copy_to_user(argp, &ident,
 460                                 sizeof (ident)) ? -EFAULT : 0;
 461
 462                 case WDIOC_GETSTATUS:
 463                 {
 464                         int status;
 465
 466                         pcipcwd_get_status(&status);
 467
 468                         return put_user(status, p);
 469                 }
 470
 471                 case WDIOC_GETBOOTSTATUS:
 472                         return put_user(pcipcwd_private.boot_status, p);
 473
 474                 case WDIOC_GETTEMP:
 475                 {
 476                         int temperature;
 477
 478                         if (pcipcwd_get_temperature(&temperature))
 479                                 return -EFAULT;
 480
 481                         return put_user(temperature, p);
 482                 }
 483
 484                 case WDIOC_KEEPALIVE:
 485                         pcipcwd_keepalive();
 486                         return 0;
 487
 488                 case WDIOC_SETOPTIONS:
 489                 {
 490                         int new_options, retval = -EINVAL;
 491
 492                         if (get_user (new_options, p))
 493                                 return -EFAULT;
 494
 495                         if (new_options & WDIOS_DISABLECARD) {
 496                                 if (pcipcwd_stop())
 497                                         return -EIO;
 498                                 retval = 0;
 499                         }
 500
 501                         if (new_options & WDIOS_ENABLECARD) {
 502                                 if (pcipcwd_start())
 503                                         return -EIO;
 504                                 retval = 0;
 505                         }
 506
 507                         if (new_options & WDIOS_TEMPPANIC) {
 508                                 temp_panic = 1;
 509                                 retval = 0;
 510                         }
 511
 512                         return retval;
 513                 }
 514
 515                 case WDIOC_SETTIMEOUT:
 516                 {
 517                         int new_heartbeat;
 518
 519                         if (get_user(new_heartbeat, p))
 520                                 return -EFAULT;
 521
 522                         if (pcipcwd_set_heartbeat(new_heartbeat))
 523                             return -EINVAL;
 524
 525                         pcipcwd_keepalive();
 526                         /* Fall */
 527                 }
 528
 529                 case WDIOC_GETTIMEOUT:
 530                         return put_user(heartbeat, p);
 531
 532                 case WDIOC_GETTIMELEFT:
 533                 {
 534                         int time_left;
 535
 536                         if (pcipcwd_get_timeleft(&time_left))
 537                                 return -EFAULT;
 538
 539                         return put_user(time_left, p);
 540                 }
 541
 542                 default:
 543                         return -ENOTTY;
 544         }
 545 }
 546
 547 static int pcipcwd_open(struct inode *inode, struct file *file)
 548 {
 549         /* /dev/watchdog can only be opened once */
 550         if (test_and_set_bit(0, &is_active)) {
 551                 if (debug >= VERBOSE)
 552                         printk(KERN_ERR PFX "Attempt to open already opened device.\n");
 553                 return -EBUSY;
 554         }
 555
 556         /* Activate */
 557         pcipcwd_start();
 558         pcipcwd_keepalive();
 559         return nonseekable_open(inode, file);
 560 }
 561
 562 static int pcipcwd_release(struct inode *inode, struct file *file)
 563 {
 564         /*
 565          *      Shut off the timer.
 566          */
 567         if (expect_release == 42) {
 568                 pcipcwd_stop();
 569         } else {
 570                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
 571                 pcipcwd_keepalive();
 572         }
 573         expect_release = 0;
 574         clear_bit(0, &is_active);
 575         return 0;
 576 }
 577
 578 /*
 579  *      /dev/temperature handling
 580  */
 581
 582 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 583                                 size_t len, loff_t *ppos)
 584 {
 585         int temperature;
 586
 587         if (pcipcwd_get_temperature(&temperature))
 588                 return -EFAULT;
 589
 590         if (copy_to_user (data, &temperature, 1))
 591                 return -EFAULT;
 592
 593         return 1;
 594 }
 595
 596 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 597 {
 598         if (!pcipcwd_private.supports_temp)
 599                 return -ENODEV;
 600
 601         return nonseekable_open(inode, file);
 602 }
 603
 604 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 605 {
 606         return 0;
 607 }
 608
 609 /*
 610  *      Notify system
 611  */
 612
 613 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
 614 {
 615         if (code==SYS_DOWN || code==SYS_HALT) {
 616                 /* Turn the WDT off */
 617                 pcipcwd_stop();
 618         }
 619
 620         return NOTIFY_DONE;
 621 }
 622
 623 /*
 624  *      Kernel Interfaces
 625  */
 626
 627 static const struct file_operations pcipcwd_fops = {
 628         .owner =        THIS_MODULE,
 629         .llseek =       no_llseek,
 630         .write =        pcipcwd_write,
 631         .ioctl =        pcipcwd_ioctl,
 632         .open =         pcipcwd_open,
 633         .release =      pcipcwd_release,
 634 };
 635
 636 static struct miscdevice pcipcwd_miscdev = {
 637         .minor =        WATCHDOG_MINOR,
 638         .name =         "watchdog",
 639         .fops =         &pcipcwd_fops,
 640 };
 641
 642 static const struct file_operations pcipcwd_temp_fops = {
 643         .owner =        THIS_MODULE,
 644         .llseek =       no_llseek,
 645         .read =         pcipcwd_temp_read,
 646         .open =         pcipcwd_temp_open,
 647         .release =      pcipcwd_temp_release,
 648 };
 649
 650 static struct miscdevice pcipcwd_temp_miscdev = {
 651         .minor =        TEMP_MINOR,
 652         .name =         "temperature",
 653         .fops =         &pcipcwd_temp_fops,
 654 };
 655
 656 static struct notifier_block pcipcwd_notifier = {
 657         .notifier_call =        pcipcwd_notify_sys,
 658 };
 659
 660 /*
 661  *      Init & exit routines
 662  */
 663
 664 static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 665                 const struct pci_device_id *ent)
 666 {
 667         int ret = -EIO;
 668
 669         cards_found++;
 670         if (cards_found == 1)
 671                 printk(KERN_INFO PFX DRIVER_VERSION);
 672
 673         if (cards_found > 1) {
 674                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
 675                 return -ENODEV;
 676         }
 677
 678         if (pci_enable_device(pdev)) {
 679                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 680                 return -ENODEV;
 681         }
 682
 683         if (pci_resource_start(pdev, 0) == 0x0000) {
 684                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 685                 ret = -ENODEV;
 686                 goto err_out_disable_device;
 687         }
 688
 689         pcipcwd_private.pdev = pdev;
 690         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 691
 692         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 693                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 694                         (int) pcipcwd_private.io_addr);
 695                 ret = -EIO;
 696                 goto err_out_disable_device;
 697         }
 698
 699         /* get the boot_status */
 700         pcipcwd_get_status(&pcipcwd_private.boot_status);
 701
 702         /* clear the "card caused reboot" flag */
 703         pcipcwd_clear_status();
 704
 705         /* disable card */
 706         pcipcwd_stop();
 707
 708         /* Check whether or not the card supports the temperature device */
 709         pcipcwd_check_temperature_support();
 710
 711         /* Show info about the card itself */
 712         pcipcwd_show_card_info();
 713
 714         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 715         if (pcipcwd_set_heartbeat(heartbeat)) {
 716                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 717                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 718                         WATCHDOG_HEARTBEAT);
 719         }
 720
 721         ret = register_reboot_notifier(&pcipcwd_notifier);
 722         if (ret != 0) {
 723                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 724                         ret);
 725                 goto err_out_release_region;
 726         }
 727
 728         if (pcipcwd_private.supports_temp) {
 729                 ret = misc_register(&pcipcwd_temp_miscdev);
 730                 if (ret != 0) {
 731                         printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 732                                 TEMP_MINOR, ret);
 733                         goto err_out_unregister_reboot;
 734                 }
 735         }
 736
 737         ret = misc_register(&pcipcwd_miscdev);
 738         if (ret != 0) {
 739                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 740                         WATCHDOG_MINOR, ret);
 741                 goto err_out_misc_deregister;
 742         }
 743
 744         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 745                 heartbeat, nowayout);
 746
 747         return 0;
 748
 749 err_out_misc_deregister:
 750         if (pcipcwd_private.supports_temp)
 751                 misc_deregister(&pcipcwd_temp_miscdev);
 752 err_out_unregister_reboot:
 753         unregister_reboot_notifier(&pcipcwd_notifier);
 754 err_out_release_region:
 755         pci_release_regions(pdev);
 756 err_out_disable_device:
 757         pci_disable_device(pdev);
 758         return ret;
 759 }
 760
 761 static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 762 {
 763         /* Stop the timer before we leave */
 764         if (!nowayout)
 765                 pcipcwd_stop();
 766
 767         /* Deregister */
 768         misc_deregister(&pcipcwd_miscdev);
 769         if (pcipcwd_private.supports_temp)
 770                 misc_deregister(&pcipcwd_temp_miscdev);
 771         unregister_reboot_notifier(&pcipcwd_notifier);
 772         pci_release_regions(pdev);
 773         pci_disable_device(pdev);
 774         cards_found--;
 775 }
 776
 777 static struct pci_device_id pcipcwd_pci_tbl[] = {
 778         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 779                 PCI_ANY_ID, PCI_ANY_ID, },
 780         { 0 },                  /* End of list */
 781 };
 782 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 783
 784 static struct pci_driver pcipcwd_driver = {
 785         .name           = WATCHDOG_NAME,
 786         .id_table       = pcipcwd_pci_tbl,
 787         .probe          = pcipcwd_card_init,
 788         .remove         = __devexit_p(pcipcwd_card_exit),
 789 };
 790
 791 static int __init pcipcwd_init_module(void)
 792 {
 793         spin_lock_init(&pcipcwd_private.io_lock);
 794
 795         return pci_register_driver(&pcipcwd_driver);
 796 }
 797
 798 static void __exit pcipcwd_cleanup_module(void)
 799 {
 800         pci_unregister_driver(&pcipcwd_driver);
 801 }
 802
 803 module_init(pcipcwd_init_module);
 804 module_exit(pcipcwd_cleanup_module);
 805
 806 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 807 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 808 MODULE_LICENSE("GPL");
 809 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 810 MODULE_ALIAS_MISCDEV(TEMP_MINOR);