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#include <linux/module.h>       /* For module specific items */
  36#include <linux/moduleparam.h>  /* For new moduleparam's */
  37#include <linux/types.h>        /* For standard types (like size_t) */
  38#include <linux/errno.h>        /* For the -ENODEV/... values */
  39#include <linux/kernel.h>       /* For printk/panic/... */
  40#include <linux/delay.h>        /* For mdelay function */
  41#include <linux/miscdevice.h>   /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
  42#include <linux/watchdog.h>     /* For the watchdog specific items */
  43#include <linux/notifier.h>     /* For notifier support */
  44#include <linux/reboot.h>       /* For reboot_notifier stuff */
  45#include <linux/init.h>         /* For __init/__exit/... */
  46#include <linux/fs.h>           /* For file operations */
  47#include <linux/pci.h>          /* For pci functions */
  48#include <linux/ioport.h>       /* For io-port access */
  49#include <linux/spinlock.h>     /* For spin_lock/spin_unlock/... */
  50#include <linux/uaccess.h>      /* For copy_to_user/put_user/... */
  51#include <linux/io.h>           /* For inb/outb/... */
  52
  53/* Module and version information */
  54#define WATCHDOG_VERSION "1.03"
  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 "\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 /
  80                                                                        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/* Watchdog's Dip Switch heartbeat values */
 100static const int heartbeat_tbl[] = {
 101        5,      /* OFF-OFF-OFF  =  5 Sec  */
 102        10,     /* OFF-OFF-ON   = 10 Sec  */
 103        30,     /* OFF-ON-OFF   = 30 Sec  */
 104        60,     /* OFF-ON-ON    =  1 Min  */
 105        300,    /* ON-OFF-OFF   =  5 Min  */
 106        600,    /* ON-OFF-ON    = 10 Min  */
 107        1800,   /* ON-ON-OFF    = 30 Min  */
 108        3600,   /* ON-ON-ON     =  1 hour */
 109};
 110
 111/* We can only use 1 card due to the /dev/watchdog restriction */
 112static int cards_found;
 113
 114/* internal variables */
 115static int temp_panic;
 116static unsigned long is_active;
 117static char expect_release;
 118/* this is private data for each PCI-PC watchdog card */
 119static struct {
 120        /* Wether or not the card has a temperature device */
 121        int supports_temp;
 122        /* The card's boot status */
 123        int boot_status;
 124        /* The cards I/O address */
 125        unsigned long io_addr;
 126        /* the lock for io operations */
 127        spinlock_t io_lock;
 128        /* the PCI-device */
 129        struct pci_dev *pdev;
 130} pcipcwd_private;
 131
 132/* module parameters */
 133#define QUIET   0       /* Default */
 134#define VERBOSE 1       /* Verbose */
 135#define DEBUG   2       /* print fancy stuff too */
 136static int debug = QUIET;
 137module_param(debug, int, 0);
 138MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
 139
 140#define WATCHDOG_HEARTBEAT 0    /* default heartbeat =
 141                                                delay-time from dip-switches */
 142static int heartbeat = WATCHDOG_HEARTBEAT;
 143module_param(heartbeat, int, 0);
 144MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
 145        "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
 146                                __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 147
 148static int nowayout = WATCHDOG_NOWAYOUT;
 149module_param(nowayout, int, 0);
 150MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 151                                        __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 152
 153/*
 154 *      Internal functions
 155 */
 156
 157static int send_command(int cmd, int *msb, int *lsb)
 158{
 159        int got_response, count;
 160
 161        if (debug >= DEBUG)
 162                printk(KERN_DEBUG PFX "sending following data "
 163                "cmd=0x%02x msb=0x%02x lsb=0x%02x\n", cmd, *msb, *lsb);
 164
 165        spin_lock(&pcipcwd_private.io_lock);
 166        /* If a command requires data it should be written first.
 167         * Data for commands with 8 bits of data should be written to port 4.
 168         * Commands with 16 bits of data, should be written as LSB to port 4
 169         * and MSB to port 5.
 170         * After the required data has been written then write the command to
 171         * port 6. */
 172        outb_p(*lsb, pcipcwd_private.io_addr + 4);
 173        outb_p(*msb, pcipcwd_private.io_addr + 5);
 174        outb_p(cmd, pcipcwd_private.io_addr + 6);
 175
 176        /* wait till the pci card processed the command, signaled by
 177         * the WRSP bit in port 2 and give it a max. timeout of
 178         * PCI_COMMAND_TIMEOUT to process */
 179        got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 180        for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
 181                                                                count++) {
 182                mdelay(1);
 183                got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 184        }
 185
 186        if (debug >= DEBUG) {
 187                if (got_response) {
 188                        printk(KERN_DEBUG PFX
 189                                "time to process command was: %d ms\n",
 190                                count);
 191                } else {
 192                        printk(KERN_DEBUG PFX
 193                                "card did not respond on command!\n");
 194                }
 195        }
 196
 197        if (got_response) {
 198                /* read back response */
 199                *lsb = inb_p(pcipcwd_private.io_addr + 4);
 200                *msb = inb_p(pcipcwd_private.io_addr + 5);
 201
 202                /* clear WRSP bit */
 203                inb_p(pcipcwd_private.io_addr + 6);
 204
 205                if (debug >= DEBUG)
 206                        printk(KERN_DEBUG PFX "received following data for "
 207                                "cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
 208                                cmd, *msb, *lsb);
 209        }
 210
 211        spin_unlock(&pcipcwd_private.io_lock);
 212
 213        return got_response;
 214}
 215
 216static inline void pcipcwd_check_temperature_support(void)
 217{
 218        if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 219                pcipcwd_private.supports_temp = 1;
 220}
 221
 222static int pcipcwd_get_option_switches(void)
 223{
 224        int option_switches;
 225
 226        option_switches = inb_p(pcipcwd_private.io_addr + 3);
 227        return option_switches;
 228}
 229
 230static void pcipcwd_show_card_info(void)
 231{
 232        int got_fw_rev, fw_rev_major, fw_rev_minor;
 233        char fw_ver_str[20];            /* The cards firmware version */
 234        int option_switches;
 235
 236        got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
 237                                                                &fw_rev_minor);
 238        if (got_fw_rev)
 239                sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 240        else
 241                sprintf(fw_ver_str, "<card no answer>");
 242
 243        /* Get switch settings */
 244        option_switches = pcipcwd_get_option_switches();
 245
 246        printk(KERN_INFO PFX "Found card at port "
 247                "0x%04x (Firmware: %s) %s temp option\n",
 248                (int) pcipcwd_private.io_addr, fw_ver_str,
 249                (pcipcwd_private.supports_temp ? "with" : "without"));
 250
 251        printk(KERN_INFO PFX "Option switches (0x%02x): "
 252                "Temperature Reset Enable=%s, Power On Delay=%s\n",
 253                option_switches,
 254                ((option_switches & 0x10) ? "ON" : "OFF"),
 255                ((option_switches & 0x08) ? "ON" : "OFF"));
 256
 257        if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 258                printk(KERN_INFO PFX
 259                        "Previous reset was caused by the Watchdog card\n");
 260
 261        if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 262                printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 263
 264        if (pcipcwd_private.boot_status == 0)
 265                printk(KERN_INFO PFX
 266                        "No previous trip detected - Cold boot or reset\n");
 267}
 268
 269static int pcipcwd_start(void)
 270{
 271        int stat_reg;
 272
 273        spin_lock(&pcipcwd_private.io_lock);
 274        outb_p(0x00, pcipcwd_private.io_addr + 3);
 275        udelay(1000);
 276
 277        stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 278        spin_unlock(&pcipcwd_private.io_lock);
 279
 280        if (stat_reg & WD_PCI_WDIS) {
 281                printk(KERN_ERR PFX "Card timer not enabled\n");
 282                return -1;
 283        }
 284
 285        if (debug >= VERBOSE)
 286                printk(KERN_DEBUG PFX "Watchdog started\n");
 287
 288        return 0;
 289}
 290
 291static int pcipcwd_stop(void)
 292{
 293        int stat_reg;
 294
 295        spin_lock(&pcipcwd_private.io_lock);
 296        outb_p(0xA5, pcipcwd_private.io_addr + 3);
 297        udelay(1000);
 298
 299        outb_p(0xA5, pcipcwd_private.io_addr + 3);
 300        udelay(1000);
 301
 302        stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 303        spin_unlock(&pcipcwd_private.io_lock);
 304
 305        if (!(stat_reg & WD_PCI_WDIS)) {
 306                printk(KERN_ERR PFX
 307                        "Card did not acknowledge disable attempt\n");
 308                return -1;
 309        }
 310
 311        if (debug >= VERBOSE)
 312                printk(KERN_DEBUG PFX "Watchdog stopped\n");
 313
 314        return 0;
 315}
 316
 317static int pcipcwd_keepalive(void)
 318{
 319        /* Re-trigger watchdog by writing to port 0 */
 320        spin_lock(&pcipcwd_private.io_lock);
 321        outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
 322        spin_unlock(&pcipcwd_private.io_lock);
 323
 324        if (debug >= DEBUG)
 325                printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
 326
 327        return 0;
 328}
 329
 330static int pcipcwd_set_heartbeat(int t)
 331{
 332        int t_msb = t / 256;
 333        int t_lsb = t % 256;
 334
 335        if ((t < 0x0001) || (t > 0xFFFF))
 336                return -EINVAL;
 337
 338        /* Write new heartbeat to watchdog */
 339        send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 340
 341        heartbeat = t;
 342        if (debug >= VERBOSE)
 343                printk(KERN_DEBUG PFX "New heartbeat: %d\n",
 344                       heartbeat);
 345
 346        return 0;
 347}
 348
 349static int pcipcwd_get_status(int *status)
 350{
 351        int control_status;
 352
 353        *status = 0;
 354        control_status = inb_p(pcipcwd_private.io_addr + 1);
 355        if (control_status & WD_PCI_WTRP)
 356                *status |= WDIOF_CARDRESET;
 357        if (control_status & WD_PCI_TTRP) {
 358                *status |= WDIOF_OVERHEAT;
 359                if (temp_panic)
 360                        panic(PFX "Temperature overheat trip!\n");
 361        }
 362
 363        if (debug >= DEBUG)
 364                printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
 365                       control_status);
 366
 367        return 0;
 368}
 369
 370static int pcipcwd_clear_status(void)
 371{
 372        int control_status;
 373        int msb;
 374        int reset_counter;
 375
 376        if (debug >= VERBOSE)
 377                printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
 378
 379        control_status = inb_p(pcipcwd_private.io_addr + 1);
 380
 381        if (debug >= DEBUG) {
 382                printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
 383                printk(KERN_DEBUG PFX "sending: 0x%02x\n",
 384                       (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
 385        }
 386
 387        /* clear trip status & LED and keep mode of relay 2 */
 388        outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
 389                                                pcipcwd_private.io_addr + 1);
 390
 391        /* clear reset counter */
 392        msb = 0;
 393        reset_counter = 0xff;
 394        send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
 395
 396        if (debug >= DEBUG) {
 397                printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
 398                       reset_counter);
 399        }
 400
 401        return 0;
 402}
 403
 404static int pcipcwd_get_temperature(int *temperature)
 405{
 406        *temperature = 0;
 407        if (!pcipcwd_private.supports_temp)
 408                return -ENODEV;
 409
 410        spin_lock(&pcipcwd_private.io_lock);
 411        *temperature = inb_p(pcipcwd_private.io_addr);
 412        spin_unlock(&pcipcwd_private.io_lock);
 413
 414        /*
 415         * Convert celsius to fahrenheit, since this was
 416         * the decided 'standard' for this return value.
 417         */
 418        *temperature = (*temperature * 9 / 5) + 32;
 419
 420        if (debug >= DEBUG) {
 421                printk(KERN_DEBUG PFX "temperature is: %d F\n",
 422                       *temperature);
 423        }
 424
 425        return 0;
 426}
 427
 428static int pcipcwd_get_timeleft(int *time_left)
 429{
 430        int msb;
 431        int lsb;
 432
 433        /* Read the time that's left before rebooting */
 434        /* Note: if the board is not yet armed then we will read 0xFFFF */
 435        send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
 436
 437        *time_left = (msb << 8) + lsb;
 438
 439        if (debug >= VERBOSE)
 440                printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
 441                       *time_left);
 442
 443        return 0;
 444}
 445
 446/*
 447 *      /dev/watchdog handling
 448 */
 449
 450static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 451                             size_t len, loff_t *ppos)
 452{
 453        /* See if we got the magic character 'V' and reload the timer */
 454        if (len) {
 455                if (!nowayout) {
 456                        size_t i;
 457
 458                        /* note: just in case someone wrote the magic character
 459                         * five months ago... */
 460                        expect_release = 0;
 461
 462                        /* scan to see whether or not we got the
 463                         * magic character */
 464                        for (i = 0; i != len; i++) {
 465                                char c;
 466                                if (get_user(c, data + i))
 467                                        return -EFAULT;
 468                                if (c == 'V')
 469                                        expect_release = 42;
 470                        }
 471                }
 472
 473                /* someone wrote to us, we should reload the timer */
 474                pcipcwd_keepalive();
 475        }
 476        return len;
 477}
 478
 479static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
 480                                                unsigned long arg)
 481{
 482        void __user *argp = (void __user *)arg;
 483        int __user *p = argp;
 484        static const struct watchdog_info ident = {
 485                .options =              WDIOF_OVERHEAT |
 486                                        WDIOF_CARDRESET |
 487                                        WDIOF_KEEPALIVEPING |
 488                                        WDIOF_SETTIMEOUT |
 489                                        WDIOF_MAGICCLOSE,
 490                .firmware_version =     1,
 491                .identity =             WATCHDOG_DRIVER_NAME,
 492        };
 493
 494        switch (cmd) {
 495        case WDIOC_GETSUPPORT:
 496                return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 497
 498        case WDIOC_GETSTATUS:
 499        {
 500                int status;
 501                pcipcwd_get_status(&status);
 502                return put_user(status, p);
 503        }
 504
 505        case WDIOC_GETBOOTSTATUS:
 506                return put_user(pcipcwd_private.boot_status, p);
 507
 508        case WDIOC_GETTEMP:
 509        {
 510                int temperature;
 511
 512                if (pcipcwd_get_temperature(&temperature))
 513                        return -EFAULT;
 514
 515                return put_user(temperature, p);
 516        }
 517
 518        case WDIOC_SETOPTIONS:
 519        {
 520                int new_options, retval = -EINVAL;
 521
 522                if (get_user(new_options, p))
 523                        return -EFAULT;
 524
 525                if (new_options & WDIOS_DISABLECARD) {
 526                        if (pcipcwd_stop())
 527                                return -EIO;
 528                        retval = 0;
 529                }
 530
 531                if (new_options & WDIOS_ENABLECARD) {
 532                        if (pcipcwd_start())
 533                                return -EIO;
 534                        retval = 0;
 535                }
 536
 537                if (new_options & WDIOS_TEMPPANIC) {
 538                        temp_panic = 1;
 539                        retval = 0;
 540                }
 541
 542                return retval;
 543        }
 544
 545        case WDIOC_KEEPALIVE:
 546                pcipcwd_keepalive();
 547                return 0;
 548
 549        case WDIOC_SETTIMEOUT:
 550        {
 551                int new_heartbeat;
 552
 553                if (get_user(new_heartbeat, p))
 554                        return -EFAULT;
 555
 556                if (pcipcwd_set_heartbeat(new_heartbeat))
 557                        return -EINVAL;
 558
 559                pcipcwd_keepalive();
 560                /* Fall */
 561        }
 562
 563        case WDIOC_GETTIMEOUT:
 564                return put_user(heartbeat, p);
 565
 566        case WDIOC_GETTIMELEFT:
 567        {
 568                int time_left;
 569
 570                if (pcipcwd_get_timeleft(&time_left))
 571                        return -EFAULT;
 572
 573                return put_user(time_left, p);
 574        }
 575
 576        default:
 577                return -ENOTTY;
 578        }
 579}
 580
 581static int pcipcwd_open(struct inode *inode, struct file *file)
 582{
 583        /* /dev/watchdog can only be opened once */
 584        if (test_and_set_bit(0, &is_active)) {
 585                if (debug >= VERBOSE)
 586                        printk(KERN_ERR PFX
 587                                "Attempt to open already opened device.\n");
 588                return -EBUSY;
 589        }
 590
 591        /* Activate */
 592        pcipcwd_start();
 593        pcipcwd_keepalive();
 594        return nonseekable_open(inode, file);
 595}
 596
 597static int pcipcwd_release(struct inode *inode, struct file *file)
 598{
 599        /*
 600         *      Shut off the timer.
 601         */
 602        if (expect_release == 42) {
 603                pcipcwd_stop();
 604        } else {
 605                printk(KERN_CRIT PFX
 606                        "Unexpected close, not stopping watchdog!\n");
 607                pcipcwd_keepalive();
 608        }
 609        expect_release = 0;
 610        clear_bit(0, &is_active);
 611        return 0;
 612}
 613
 614/*
 615 *      /dev/temperature handling
 616 */
 617
 618static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 619                                size_t len, loff_t *ppos)
 620{
 621        int temperature;
 622
 623        if (pcipcwd_get_temperature(&temperature))
 624                return -EFAULT;
 625
 626        if (copy_to_user(data, &temperature, 1))
 627                return -EFAULT;
 628
 629        return 1;
 630}
 631
 632static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 633{
 634        if (!pcipcwd_private.supports_temp)
 635                return -ENODEV;
 636
 637        return nonseekable_open(inode, file);
 638}
 639
 640static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 641{
 642        return 0;
 643}
 644
 645/*
 646 *      Notify system
 647 */
 648
 649static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
 650                                                                void *unused)
 651{
 652        if (code == SYS_DOWN || code == SYS_HALT)
 653                pcipcwd_stop(); /* Turn the WDT off */
 654
 655        return NOTIFY_DONE;
 656}
 657
 658/*
 659 *      Kernel Interfaces
 660 */
 661
 662static const struct file_operations pcipcwd_fops = {
 663        .owner =        THIS_MODULE,
 664        .llseek =       no_llseek,
 665        .write =        pcipcwd_write,
 666        .unlocked_ioctl = pcipcwd_ioctl,
 667        .open =         pcipcwd_open,
 668        .release =      pcipcwd_release,
 669};
 670
 671static struct miscdevice pcipcwd_miscdev = {
 672        .minor =        WATCHDOG_MINOR,
 673        .name =         "watchdog",
 674        .fops =         &pcipcwd_fops,
 675};
 676
 677static const struct file_operations pcipcwd_temp_fops = {
 678        .owner =        THIS_MODULE,
 679        .llseek =       no_llseek,
 680        .read =         pcipcwd_temp_read,
 681        .open =         pcipcwd_temp_open,
 682        .release =      pcipcwd_temp_release,
 683};
 684
 685static struct miscdevice pcipcwd_temp_miscdev = {
 686        .minor =        TEMP_MINOR,
 687        .name =         "temperature",
 688        .fops =         &pcipcwd_temp_fops,
 689};
 690
 691static struct notifier_block pcipcwd_notifier = {
 692        .notifier_call =        pcipcwd_notify_sys,
 693};
 694
 695/*
 696 *      Init & exit routines
 697 */
 698
 699static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 700                const struct pci_device_id *ent)
 701{
 702        int ret = -EIO;
 703
 704        cards_found++;
 705        if (cards_found == 1)
 706                printk(KERN_INFO PFX DRIVER_VERSION);
 707
 708        if (cards_found > 1) {
 709                printk(KERN_ERR PFX "This driver only supports 1 device\n");
 710                return -ENODEV;
 711        }
 712
 713        if (pci_enable_device(pdev)) {
 714                printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 715                return -ENODEV;
 716        }
 717
 718        if (pci_resource_start(pdev, 0) == 0x0000) {
 719                printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 720                ret = -ENODEV;
 721                goto err_out_disable_device;
 722        }
 723
 724        pcipcwd_private.pdev = pdev;
 725        pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 726
 727        if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 728                printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 729                        (int) pcipcwd_private.io_addr);
 730                ret = -EIO;
 731                goto err_out_disable_device;
 732        }
 733
 734        /* get the boot_status */
 735        pcipcwd_get_status(&pcipcwd_private.boot_status);
 736
 737        /* clear the "card caused reboot" flag */
 738        pcipcwd_clear_status();
 739
 740        /* disable card */
 741        pcipcwd_stop();
 742
 743        /* Check whether or not the card supports the temperature device */
 744        pcipcwd_check_temperature_support();
 745
 746        /* Show info about the card itself */
 747        pcipcwd_show_card_info();
 748
 749        /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
 750        if (heartbeat == 0)
 751                heartbeat =
 752                        heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
 753
 754        /* Check that the heartbeat value is within it's range ;
 755         * if not reset to the default */
 756        if (pcipcwd_set_heartbeat(heartbeat)) {
 757                pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 758                printk(KERN_INFO PFX
 759                        "heartbeat value must be 0<heartbeat<65536, using %d\n",
 760                        WATCHDOG_HEARTBEAT);
 761        }
 762
 763        ret = register_reboot_notifier(&pcipcwd_notifier);
 764        if (ret != 0) {
 765                printk(KERN_ERR PFX
 766                        "cannot register reboot notifier (err=%d)\n", ret);
 767                goto err_out_release_region;
 768        }
 769
 770        if (pcipcwd_private.supports_temp) {
 771                ret = misc_register(&pcipcwd_temp_miscdev);
 772                if (ret != 0) {
 773                        printk(KERN_ERR PFX "cannot register miscdev on "
 774                                "minor=%d (err=%d)\n", TEMP_MINOR, ret);
 775                        goto err_out_unregister_reboot;
 776                }
 777        }
 778
 779        ret = misc_register(&pcipcwd_miscdev);
 780        if (ret != 0) {
 781                printk(KERN_ERR PFX
 782                        "cannot register miscdev on minor=%d (err=%d)\n",
 783                        WATCHDOG_MINOR, ret);
 784                goto err_out_misc_deregister;
 785        }
 786
 787        printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 788                heartbeat, nowayout);
 789
 790        return 0;
 791
 792err_out_misc_deregister:
 793        if (pcipcwd_private.supports_temp)
 794                misc_deregister(&pcipcwd_temp_miscdev);
 795err_out_unregister_reboot:
 796        unregister_reboot_notifier(&pcipcwd_notifier);
 797err_out_release_region:
 798        pci_release_regions(pdev);
 799err_out_disable_device:
 800        pci_disable_device(pdev);
 801        return ret;
 802}
 803
 804static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 805{
 806        /* Stop the timer before we leave */
 807        if (!nowayout)
 808                pcipcwd_stop();
 809
 810        /* Deregister */
 811        misc_deregister(&pcipcwd_miscdev);
 812        if (pcipcwd_private.supports_temp)
 813                misc_deregister(&pcipcwd_temp_miscdev);
 814        unregister_reboot_notifier(&pcipcwd_notifier);
 815        pci_release_regions(pdev);
 816        pci_disable_device(pdev);
 817        cards_found--;
 818}
 819
 820static struct pci_device_id pcipcwd_pci_tbl[] = {
 821        { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 822                PCI_ANY_ID, PCI_ANY_ID, },
 823        { 0 },                  /* End of list */
 824};
 825MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 826
 827static struct pci_driver pcipcwd_driver = {
 828        .name           = WATCHDOG_NAME,
 829        .id_table       = pcipcwd_pci_tbl,
 830        .probe          = pcipcwd_card_init,
 831        .remove         = __devexit_p(pcipcwd_card_exit),
 832};
 833
 834static int __init pcipcwd_init_module(void)
 835{
 836        spin_lock_init(&pcipcwd_private.io_lock);
 837
 838        return pci_register_driver(&pcipcwd_driver);
 839}
 840
 841static void __exit pcipcwd_cleanup_module(void)
 842{
 843        pci_unregister_driver(&pcipcwd_driver);
 844
 845        printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
 846}
 847
 848module_init(pcipcwd_init_module);
 849module_exit(pcipcwd_cleanup_module);
 850
 851MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 852MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 853MODULE_LICENSE("GPL");
 854MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 855MODULE_ALIAS_MISCDEV(TEMP_MINOR);
 856