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