drivers/watchdog/pcwd_pci.c

   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 */
  99 static 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 */
 111 static int cards_found;
 112
 113 /* internal variables */
 114 static int temp_panic;
 115 static unsigned long is_active;
 116 static char expect_release;
 117 static 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 */
 129 static int debug = QUIET;
 130 module_param(debug, int, 0);
 131 MODULE_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 */
 134 static int heartbeat = WATCHDOG_HEARTBEAT;
 135 module_param(heartbeat, int, 0);
 136 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 137
 138 static int nowayout = WATCHDOG_NOWAYOUT;
 139 module_param(nowayout, int, 0);
 140 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 141
 142 /*
 143  *      Internal functions
 144  */
 145
 146 static 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
 201 static 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
 207 static 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
 215 static 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
 249 static 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
 271 static 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
 296 static 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
 309 static 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
 328 static 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
 349 static 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
 382 static 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
 406 static 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
 428 static 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
 456 static 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
 558 static 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
 573 static 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
 593 static 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
 607 static 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
 615 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 616 {
 617         return 0;
 618 }
 619
 620 /*
 621  *      Notify system
 622  */
 623
 624 static 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
 636 static 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
 645 static struct miscdevice pcipcwd_miscdev = {
 646         .minor =        WATCHDOG_MINOR,
 647         .name =         "watchdog",
 648         .fops =         &pcipcwd_fops,
 649 };
 650
 651 static 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
 659 static struct miscdevice pcipcwd_temp_miscdev = {
 660         .minor =        TEMP_MINOR,
 661         .name =         "temperature",
 662         .fops =         &pcipcwd_temp_fops,
 663 };
 664
 665 static struct notifier_block pcipcwd_notifier = {
 666         .notifier_call =        pcipcwd_notify_sys,
 667 };
 668
 669 /*
 670  *      Init & exit routines
 671  */
 672
 673 static 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
 762 err_out_misc_deregister:
 763         if (pcipcwd_private.supports_temp)
 764                 misc_deregister(&pcipcwd_temp_miscdev);
 765 err_out_unregister_reboot:
 766         unregister_reboot_notifier(&pcipcwd_notifier);
 767 err_out_release_region:
 768         pci_release_regions(pdev);
 769 err_out_disable_device:
 770         pci_disable_device(pdev);
 771         return ret;
 772 }
 773
 774 static 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
 790 static 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 };
 795 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 796
 797 static 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
 804 static 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
 811 static 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
 818 module_init(pcipcwd_init_module);
 819 module_exit(pcipcwd_cleanup_module);
 820
 821 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 822 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 823 MODULE_LICENSE("GPL");
 824 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 825 MODULE_ALIAS_MISCDEV(TEMP_MINOR);