linux/drivers/watchdog/pcwd_pci.c
<<
>>
Prefs
   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 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 */
  99static 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 */
 111static int cards_found;
 112
 113/* internal variables */
 114static int temp_panic;
 115static unsigned long is_active;
 116static char expect_release;
 117static 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 */
 129static int debug = QUIET;
 130module_param(debug, int, 0);
 131MODULE_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 */
 134static int heartbeat = WATCHDOG_HEARTBEAT;
 135module_param(heartbeat, int, 0);
 136MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 137
 138static int nowayout = WATCHDOG_NOWAYOUT;
 139module_param(nowayout, int, 0);
 140MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 141
 142/*
 143 *      Internal functions
 144 */
 145
 146static 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
 201static 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
 207static 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
 215static 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        /* Get switch settings */
 228        option_switches = pcipcwd_get_option_switches();
 229
 230        printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
 231                (int) pcipcwd_private.io_addr, fw_ver_str,
 232                (pcipcwd_private.supports_temp ? "with" : "without"));
 233
 234        printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 235                option_switches,
 236                ((option_switches & 0x10) ? "ON" : "OFF"),
 237                ((option_switches & 0x08) ? "ON" : "OFF"));
 238
 239        if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 240                printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
 241
 242        if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 243                printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 244
 245        if (pcipcwd_private.boot_status == 0)
 246                printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
 247}
 248
 249static int pcipcwd_start(void)
 250{
 251        int stat_reg;
 252
 253        spin_lock(&pcipcwd_private.io_lock);
 254        outb_p(0x00, pcipcwd_private.io_addr + 3);
 255        udelay(1000);
 256
 257        stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 258        spin_unlock(&pcipcwd_private.io_lock);
 259
 260        if (stat_reg & WD_PCI_WDIS) {
 261                printk(KERN_ERR PFX "Card timer not enabled\n");
 262                return -1;
 263        }
 264
 265        if (debug >= VERBOSE)
 266                printk(KERN_DEBUG PFX "Watchdog started\n");
 267
 268        return 0;
 269}
 270
 271static int pcipcwd_stop(void)
 272{
 273        int stat_reg;
 274
 275        spin_lock(&pcipcwd_private.io_lock);
 276        outb_p(0xA5, pcipcwd_private.io_addr + 3);
 277        udelay(1000);
 278
 279        outb_p(0xA5, pcipcwd_private.io_addr + 3);
 280        udelay(1000);
 281
 282        stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 283        spin_unlock(&pcipcwd_private.io_lock);
 284
 285        if (!(stat_reg & WD_PCI_WDIS)) {
 286                printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
 287                return -1;
 288        }
 289
 290        if (debug >= VERBOSE)
 291                printk(KERN_DEBUG PFX "Watchdog stopped\n");
 292
 293        return 0;
 294}
 295
 296static int pcipcwd_keepalive(void)
 297{
 298        /* Re-trigger watchdog by writing to port 0 */
 299        spin_lock(&pcipcwd_private.io_lock);
 300        outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
 301        spin_unlock(&pcipcwd_private.io_lock);
 302
 303        if (debug >= DEBUG)
 304                printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
 305
 306        return 0;
 307}
 308
 309static int pcipcwd_set_heartbeat(int t)
 310{
 311        int t_msb = t / 256;
 312        int t_lsb = t % 256;
 313
 314        if ((t < 0x0001) || (t > 0xFFFF))
 315                return -EINVAL;
 316
 317        /* Write new heartbeat to watchdog */
 318        send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 319
 320        heartbeat = t;
 321        if (debug >= VERBOSE)
 322                printk(KERN_DEBUG PFX "New heartbeat: %d\n",
 323                       heartbeat);
 324
 325        return 0;
 326}
 327
 328static int pcipcwd_get_status(int *status)
 329{
 330        int control_status;
 331
 332        *status = 0;
 333        control_status = inb_p(pcipcwd_private.io_addr + 1);
 334        if (control_status & WD_PCI_WTRP)
 335                *status |= WDIOF_CARDRESET;
 336        if (control_status & WD_PCI_TTRP) {
 337                *status |= WDIOF_OVERHEAT;
 338                if (temp_panic)
 339                        panic(PFX "Temperature overheat trip!\n");
 340        }
 341
 342        if (debug >= DEBUG)
 343                printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
 344                       control_status);
 345
 346        return 0;
 347}
 348
 349static int pcipcwd_clear_status(void)
 350{
 351        int control_status;
 352        int msb;
 353        int reset_counter;
 354
 355        if (debug >= VERBOSE)
 356                printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
 357
 358        control_status = inb_p(pcipcwd_private.io_addr + 1);
 359
 360        if (debug >= DEBUG) {
 361                printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
 362                printk(KERN_DEBUG PFX "sending: 0x%02x\n",
 363                       (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
 364        }
 365
 366        /* clear trip status & LED and keep mode of relay 2 */
 367        outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1);
 368
 369        /* clear reset counter */
 370        msb = 0;
 371        reset_counter = 0xff;
 372        send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
 373
 374        if (debug >= DEBUG) {
 375                printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
 376                       reset_counter);
 377        }
 378
 379        return 0;
 380}
 381
 382static int pcipcwd_get_temperature(int *temperature)
 383{
 384        *temperature = 0;
 385        if (!pcipcwd_private.supports_temp)
 386                return -ENODEV;
 387
 388        spin_lock(&pcipcwd_private.io_lock);
 389        *temperature = inb_p(pcipcwd_private.io_addr);
 390        spin_unlock(&pcipcwd_private.io_lock);
 391
 392        /*
 393         * Convert celsius to fahrenheit, since this was
 394         * the decided 'standard' for this return value.
 395         */
 396        *temperature = (*temperature * 9 / 5) + 32;
 397
 398        if (debug >= DEBUG) {
 399                printk(KERN_DEBUG PFX "temperature is: %d F\n",
 400                       *temperature);
 401        }
 402
 403        return 0;
 404}
 405
 406static int pcipcwd_get_timeleft(int *time_left)
 407{
 408        int msb;
 409        int lsb;
 410
 411        /* Read the time that's left before rebooting */
 412        /* Note: if the board is not yet armed then we will read 0xFFFF */
 413        send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
 414
 415        *time_left = (msb << 8) + lsb;
 416
 417        if (debug >= VERBOSE)
 418                printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
 419                       *time_left);
 420
 421        return 0;
 422}
 423
 424/*
 425 *      /dev/watchdog handling
 426 */
 427
 428static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 429                             size_t len, loff_t *ppos)
 430{
 431        /* See if we got the magic character 'V' and reload the timer */
 432        if (len) {
 433                if (!nowayout) {
 434                        size_t i;
 435
 436                        /* note: just in case someone wrote the magic character
 437                         * five months ago... */
 438                        expect_release = 0;
 439
 440                        /* scan to see whether or not we got the magic character */
 441                        for (i = 0; i != len; i++) {
 442                                char c;
 443                                if (get_user(c, data + i))
 444                                        return -EFAULT;
 445                                if (c == 'V')
 446                                        expect_release = 42;
 447                        }
 448                }
 449
 450                /* someone wrote to us, we should reload the timer */
 451                pcipcwd_keepalive();
 452        }
 453        return len;
 454}
 455
 456static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
 457                                                unsigned long arg)
 458{
 459        void __user *argp = (void __user *)arg;
 460        int __user *p = argp;
 461        static struct watchdog_info ident = {
 462                .options =              WDIOF_OVERHEAT |
 463                                        WDIOF_CARDRESET |
 464                                        WDIOF_KEEPALIVEPING |
 465                                        WDIOF_SETTIMEOUT |
 466                                        WDIOF_MAGICCLOSE,
 467                .firmware_version =     1,
 468                .identity =             WATCHDOG_DRIVER_NAME,
 469        };
 470
 471        switch (cmd) {
 472        case WDIOC_GETSUPPORT:
 473                return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 474
 475        case WDIOC_GETSTATUS:
 476        {
 477                int status;
 478                pcipcwd_get_status(&status);
 479                return put_user(status, p);
 480        }
 481
 482        case WDIOC_GETBOOTSTATUS:
 483                return put_user(pcipcwd_private.boot_status, p);
 484
 485        case WDIOC_GETTEMP:
 486        {
 487                int temperature;
 488
 489                if (pcipcwd_get_temperature(&temperature))
 490                        return -EFAULT;
 491
 492                return put_user(temperature, p);
 493        }
 494
 495        case WDIOC_SETOPTIONS:
 496        {
 497                int new_options, retval = -EINVAL;
 498
 499                if (get_user(new_options, p))
 500                        return -EFAULT;
 501
 502                if (new_options & WDIOS_DISABLECARD) {
 503                        if (pcipcwd_stop())
 504                                return -EIO;
 505                        retval = 0;
 506                }
 507
 508                if (new_options & WDIOS_ENABLECARD) {
 509                        if (pcipcwd_start())
 510                                return -EIO;
 511                        retval = 0;
 512                }
 513
 514                if (new_options & WDIOS_TEMPPANIC) {
 515                        temp_panic = 1;
 516                        retval = 0;
 517                }
 518
 519                return retval;
 520        }
 521
 522        case WDIOC_KEEPALIVE:
 523                pcipcwd_keepalive();
 524                return 0;
 525
 526        case WDIOC_SETTIMEOUT:
 527        {
 528                int new_heartbeat;
 529
 530                if (get_user(new_heartbeat, p))
 531                        return -EFAULT;
 532
 533                if (pcipcwd_set_heartbeat(new_heartbeat))
 534                    return -EINVAL;
 535
 536                pcipcwd_keepalive();
 537                /* Fall */
 538        }
 539
 540        case WDIOC_GETTIMEOUT:
 541                return put_user(heartbeat, p);
 542
 543        case WDIOC_GETTIMELEFT:
 544        {
 545                int time_left;
 546
 547                if (pcipcwd_get_timeleft(&time_left))
 548                        return -EFAULT;
 549
 550                return put_user(time_left, p);
 551        }
 552
 553        default:
 554                return -ENOTTY;
 555        }
 556}
 557
 558static int pcipcwd_open(struct inode *inode, struct file *file)
 559{
 560        /* /dev/watchdog can only be opened once */
 561        if (test_and_set_bit(0, &is_active)) {
 562                if (debug >= VERBOSE)
 563                        printk(KERN_ERR PFX "Attempt to open already opened device.\n");
 564                return -EBUSY;
 565        }
 566
 567        /* Activate */
 568        pcipcwd_start();
 569        pcipcwd_keepalive();
 570        return nonseekable_open(inode, file);
 571}
 572
 573static int pcipcwd_release(struct inode *inode, struct file *file)
 574{
 575        /*
 576         *      Shut off the timer.
 577         */
 578        if (expect_release == 42) {
 579                pcipcwd_stop();
 580        } else {
 581                printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
 582                pcipcwd_keepalive();
 583        }
 584        expect_release = 0;
 585        clear_bit(0, &is_active);
 586        return 0;
 587}
 588
 589/*
 590 *      /dev/temperature handling
 591 */
 592
 593static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 594                                size_t len, loff_t *ppos)
 595{
 596        int temperature;
 597
 598        if (pcipcwd_get_temperature(&temperature))
 599                return -EFAULT;
 600
 601        if (copy_to_user(data, &temperature, 1))
 602                return -EFAULT;
 603
 604        return 1;
 605}
 606
 607static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 608{
 609        if (!pcipcwd_private.supports_temp)
 610                return -ENODEV;
 611
 612        return nonseekable_open(inode, file);
 613}
 614
 615static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 616{
 617        return 0;
 618}
 619
 620/*
 621 *      Notify system
 622 */
 623
 624static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
 625{
 626        if (code == SYS_DOWN || code == SYS_HALT)
 627                pcipcwd_stop(); /* Turn the WDT off */
 628
 629        return NOTIFY_DONE;
 630}
 631
 632/*
 633 *      Kernel Interfaces
 634 */
 635
 636static const struct file_operations pcipcwd_fops = {
 637        .owner =        THIS_MODULE,
 638        .llseek =       no_llseek,
 639        .write =        pcipcwd_write,
 640        .unlocked_ioctl = pcipcwd_ioctl,
 641        .open =         pcipcwd_open,
 642        .release =      pcipcwd_release,
 643};
 644
 645static struct miscdevice pcipcwd_miscdev = {
 646        .minor =        WATCHDOG_MINOR,
 647        .name =         "watchdog",
 648        .fops =         &pcipcwd_fops,
 649};
 650
 651static const struct file_operations pcipcwd_temp_fops = {
 652        .owner =        THIS_MODULE,
 653        .llseek =       no_llseek,
 654        .read =         pcipcwd_temp_read,
 655        .open =         pcipcwd_temp_open,
 656        .release =      pcipcwd_temp_release,
 657};
 658
 659static struct miscdevice pcipcwd_temp_miscdev = {
 660        .minor =        TEMP_MINOR,
 661        .name =         "temperature",
 662        .fops =         &pcipcwd_temp_fops,
 663};
 664
 665static struct notifier_block pcipcwd_notifier = {
 666        .notifier_call =        pcipcwd_notify_sys,
 667};
 668
 669/*
 670 *      Init & exit routines
 671 */
 672
 673static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 674                const struct pci_device_id *ent)
 675{
 676        int ret = -EIO;
 677
 678        cards_found++;
 679        if (cards_found == 1)
 680                printk(KERN_INFO PFX DRIVER_VERSION);
 681
 682        if (cards_found > 1) {
 683                printk(KERN_ERR PFX "This driver only supports 1 device\n");
 684                return -ENODEV;
 685        }
 686
 687        if (pci_enable_device(pdev)) {
 688                printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 689                return -ENODEV;
 690        }
 691
 692        if (pci_resource_start(pdev, 0) == 0x0000) {
 693                printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 694                ret = -ENODEV;
 695                goto err_out_disable_device;
 696        }
 697
 698        pcipcwd_private.pdev = pdev;
 699        pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 700
 701        if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 702                printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 703                        (int) pcipcwd_private.io_addr);
 704                ret = -EIO;
 705                goto err_out_disable_device;
 706        }
 707
 708        /* get the boot_status */
 709        pcipcwd_get_status(&pcipcwd_private.boot_status);
 710
 711        /* clear the "card caused reboot" flag */
 712        pcipcwd_clear_status();
 713
 714        /* disable card */
 715        pcipcwd_stop();
 716
 717        /* Check whether or not the card supports the temperature device */
 718        pcipcwd_check_temperature_support();
 719
 720        /* Show info about the card itself */
 721        pcipcwd_show_card_info();
 722
 723        /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
 724        if (heartbeat == 0)
 725                heartbeat = heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
 726
 727        /* Check that the heartbeat value is within it's range ; if not reset to the default */
 728        if (pcipcwd_set_heartbeat(heartbeat)) {
 729                pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 730                printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 731                        WATCHDOG_HEARTBEAT);
 732        }
 733
 734        ret = register_reboot_notifier(&pcipcwd_notifier);
 735        if (ret != 0) {
 736                printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 737                        ret);
 738                goto err_out_release_region;
 739        }
 740
 741        if (pcipcwd_private.supports_temp) {
 742                ret = misc_register(&pcipcwd_temp_miscdev);
 743                if (ret != 0) {
 744                        printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 745                                TEMP_MINOR, ret);
 746                        goto err_out_unregister_reboot;
 747                }
 748        }
 749
 750        ret = misc_register(&pcipcwd_miscdev);
 751        if (ret != 0) {
 752                printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 753                        WATCHDOG_MINOR, ret);
 754                goto err_out_misc_deregister;
 755        }
 756
 757        printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 758                heartbeat, nowayout);
 759
 760        return 0;
 761
 762err_out_misc_deregister:
 763        if (pcipcwd_private.supports_temp)
 764                misc_deregister(&pcipcwd_temp_miscdev);
 765err_out_unregister_reboot:
 766        unregister_reboot_notifier(&pcipcwd_notifier);
 767err_out_release_region:
 768        pci_release_regions(pdev);
 769err_out_disable_device:
 770        pci_disable_device(pdev);
 771        return ret;
 772}
 773
 774static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 775{
 776        /* Stop the timer before we leave */
 777        if (!nowayout)
 778                pcipcwd_stop();
 779
 780        /* Deregister */
 781        misc_deregister(&pcipcwd_miscdev);
 782        if (pcipcwd_private.supports_temp)
 783                misc_deregister(&pcipcwd_temp_miscdev);
 784        unregister_reboot_notifier(&pcipcwd_notifier);
 785        pci_release_regions(pdev);
 786        pci_disable_device(pdev);
 787        cards_found--;
 788}
 789
 790static struct pci_device_id pcipcwd_pci_tbl[] = {
 791        { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 792                PCI_ANY_ID, PCI_ANY_ID, },
 793        { 0 },                  /* End of list */
 794};
 795MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 796
 797static struct pci_driver pcipcwd_driver = {
 798        .name           = WATCHDOG_NAME,
 799        .id_table       = pcipcwd_pci_tbl,
 800        .probe          = pcipcwd_card_init,
 801        .remove         = __devexit_p(pcipcwd_card_exit),
 802};
 803
 804static int __init pcipcwd_init_module(void)
 805{
 806        spin_lock_init(&pcipcwd_private.io_lock);
 807
 808        return pci_register_driver(&pcipcwd_driver);
 809}
 810
 811static void __exit pcipcwd_cleanup_module(void)
 812{
 813        pci_unregister_driver(&pcipcwd_driver);
 814
 815        printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
 816}
 817
 818module_init(pcipcwd_init_module);
 819module_exit(pcipcwd_cleanup_module);
 820
 821MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 822MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 823MODULE_LICENSE("GPL");
 824MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 825MODULE_ALIAS_MISCDEV(TEMP_MINOR);
 826