linux/drivers/watchdog/pcwd_pci.c
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   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 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
  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 */
 101static 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 */
 113static int cards_found;
 114
 115/* internal variables */
 116static int temp_panic;
 117static unsigned long is_active;
 118static char expect_release;
 119/* this is private data for each PCI-PC watchdog card */
 120static 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 */
 137static int debug = QUIET;
 138module_param(debug, int, 0);
 139MODULE_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 */
 143static int heartbeat = WATCHDOG_HEARTBEAT;
 144module_param(heartbeat, int, 0);
 145MODULE_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
 149static bool nowayout = WATCHDOG_NOWAYOUT;
 150module_param(nowayout, bool, 0);
 151MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 152                                        __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 153
 154/*
 155 *      Internal functions
 156 */
 157
 158static 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
 214static 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
 220static 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
 228static 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
 263static 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
 285static 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
 310static 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
 323static 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
 341static 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
 361static 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
 394static 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
 417static 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
 438static 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
 467static 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
 569static 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
 584static 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
 604static 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
 618static 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
 626static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 627{
 628        return 0;
 629}
 630
 631/*
 632 *      Notify system
 633 */
 634
 635static 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
 648static 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
 657static struct miscdevice pcipcwd_miscdev = {
 658        .minor =        WATCHDOG_MINOR,
 659        .name =         "watchdog",
 660        .fops =         &pcipcwd_fops,
 661};
 662
 663static 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
 671static struct miscdevice pcipcwd_temp_miscdev = {
 672        .minor =        TEMP_MINOR,
 673        .name =         "temperature",
 674        .fops =         &pcipcwd_temp_fops,
 675};
 676
 677static struct notifier_block pcipcwd_notifier = {
 678        .notifier_call =        pcipcwd_notify_sys,
 679};
 680
 681/*
 682 *      Init & exit routines
 683 */
 684
 685static int __devinit 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
 776err_out_misc_deregister:
 777        if (pcipcwd_private.supports_temp)
 778                misc_deregister(&pcipcwd_temp_miscdev);
 779err_out_unregister_reboot:
 780        unregister_reboot_notifier(&pcipcwd_notifier);
 781err_out_release_region:
 782        pci_release_regions(pdev);
 783err_out_disable_device:
 784        pci_disable_device(pdev);
 785        return ret;
 786}
 787
 788static void __devexit 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
 804static DEFINE_PCI_DEVICE_TABLE(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};
 809MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 810
 811static struct pci_driver pcipcwd_driver = {
 812        .name           = WATCHDOG_NAME,
 813        .id_table       = pcipcwd_pci_tbl,
 814        .probe          = pcipcwd_card_init,
 815        .remove         = __devexit_p(pcipcwd_card_exit),
 816};
 817
 818module_pci_driver(pcipcwd_driver);
 819
 820MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 821MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 822MODULE_LICENSE("GPL");
 823MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 824MODULE_ALIAS_MISCDEV(TEMP_MINOR);
 825
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