git.oblomov.eu Git - linux-2.6/blob - drivers/char/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@redhat.com>,
  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
  50 #include <asm/uaccess.h>        /* For copy_to_user/put_user/... */
  51 #include <asm/io.h>             /* For inb/outb/... */
  52
  53 /* Module and version information */
  54 #define WATCHDOG_VERSION "1.03"
  55 #define WATCHDOG_DATE "21 Jan 2007"
  56 #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
  57 #define WATCHDOG_NAME "pcwd_pci"
  58 #define PFX WATCHDOG_NAME ": "
  59 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
  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/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 */
 100 static 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 */
 112 static int cards_found;
 113
 114 /* internal variables */
 115 static int temp_panic;
 116 static unsigned long is_active;
 117 static char expect_release;
 118 static struct {                         /* this is private data for each PCI-PC watchdog card */
 119         int supports_temp;              /* Wether or not the card has a temperature device */
 120         int boot_status;                /* The card's boot status */
 121         unsigned long io_addr;          /* The cards I/O address */
 122         spinlock_t io_lock;             /* the lock for io operations */
 123         struct pci_dev *pdev;           /* the PCI-device */
 124 } pcipcwd_private;
 125
 126 /* module parameters */
 127 #define QUIET   0       /* Default */
 128 #define VERBOSE 1       /* Verbose */
 129 #define DEBUG   2       /* print fancy stuff too */
 130 static int debug = QUIET;
 131 module_param(debug, int, 0);
 132 MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
 133
 134 #define WATCHDOG_HEARTBEAT 0    /* default heartbeat = delay-time from dip-switches */
 135 static int heartbeat = WATCHDOG_HEARTBEAT;
 136 module_param(heartbeat, int, 0);
 137 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536 or 0=delay-time from dip-switches, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 138
 139 static int nowayout = WATCHDOG_NOWAYOUT;
 140 module_param(nowayout, int, 0);
 141 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 142
 143 /*
 144  *      Internal functions
 145  */
 146
 147 static int send_command(int cmd, int *msb, int *lsb)
 148 {
 149         int got_response, count;
 150
 151         if (debug >= DEBUG)
 152                 printk(KERN_DEBUG PFX "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
 153                 cmd, *msb, *lsb);
 154
 155         spin_lock(&pcipcwd_private.io_lock);
 156         /* If a command requires data it should be written first.
 157          * Data for commands with 8 bits of data should be written to port 4.
 158          * Commands with 16 bits of data, should be written as LSB to port 4
 159          * and MSB to port 5.
 160          * After the required data has been written then write the command to
 161          * port 6. */
 162         outb_p(*lsb, pcipcwd_private.io_addr + 4);
 163         outb_p(*msb, pcipcwd_private.io_addr + 5);
 164         outb_p(cmd, pcipcwd_private.io_addr + 6);
 165
 166         /* wait till the pci card processed the command, signaled by
 167          * the WRSP bit in port 2 and give it a max. timeout of
 168          * PCI_COMMAND_TIMEOUT to process */
 169         got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 170         for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
 171                 mdelay(1);
 172                 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 173         }
 174
 175         if (debug >= DEBUG) {
 176                 if (got_response) {
 177                         printk(KERN_DEBUG PFX "time to process command was: %d ms\n",
 178                                 count);
 179                 } else {
 180                         printk(KERN_DEBUG PFX "card did not respond on command!\n");
 181                 }
 182         }
 183
 184         if (got_response) {
 185                 /* read back response */
 186                 *lsb = inb_p(pcipcwd_private.io_addr + 4);
 187                 *msb = inb_p(pcipcwd_private.io_addr + 5);
 188
 189                 /* clear WRSP bit */
 190                 inb_p(pcipcwd_private.io_addr + 6);
 191
 192                 if (debug >= DEBUG)
 193                         printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
 194                                 cmd, *msb, *lsb);
 195         }
 196
 197         spin_unlock(&pcipcwd_private.io_lock);
 198
 199         return got_response;
 200 }
 201
 202 static inline void pcipcwd_check_temperature_support(void)
 203 {
 204         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 205                 pcipcwd_private.supports_temp = 1;
 206 }
 207
 208 static int pcipcwd_get_option_switches(void)
 209 {
 210         int option_switches;
 211
 212         option_switches = inb_p(pcipcwd_private.io_addr + 3);
 213         return option_switches;
 214 }
 215
 216 static void pcipcwd_show_card_info(void)
 217 {
 218         int got_fw_rev, fw_rev_major, fw_rev_minor;
 219         char fw_ver_str[20];            /* The cards firmware version */
 220         int option_switches;
 221
 222         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
 223         if (got_fw_rev) {
 224                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 225         } else {
 226                 sprintf(fw_ver_str, "<card no answer>");
 227         }
 228
 229         /* Get switch settings */
 230         option_switches = pcipcwd_get_option_switches();
 231
 232         printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
 233                 (int) pcipcwd_private.io_addr, fw_ver_str,
 234                 (pcipcwd_private.supports_temp ? "with" : "without"));
 235
 236         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 237                 option_switches,
 238                 ((option_switches & 0x10) ? "ON" : "OFF"),
 239                 ((option_switches & 0x08) ? "ON" : "OFF"));
 240
 241         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 242                 printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
 243
 244         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 245                 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 246
 247         if (pcipcwd_private.boot_status == 0)
 248                 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
 249 }
 250
 251 static int pcipcwd_start(void)
 252 {
 253         int stat_reg;
 254
 255         spin_lock(&pcipcwd_private.io_lock);
 256         outb_p(0x00, pcipcwd_private.io_addr + 3);
 257         udelay(1000);
 258
 259         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 260         spin_unlock(&pcipcwd_private.io_lock);
 261
 262         if (stat_reg & WD_PCI_WDIS) {
 263                 printk(KERN_ERR PFX "Card timer not enabled\n");
 264                 return -1;
 265         }
 266
 267         if (debug >= VERBOSE)
 268                 printk(KERN_DEBUG PFX "Watchdog started\n");
 269
 270         return 0;
 271 }
 272
 273 static int pcipcwd_stop(void)
 274 {
 275         int stat_reg;
 276
 277         spin_lock(&pcipcwd_private.io_lock);
 278         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 279         udelay(1000);
 280
 281         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 282         udelay(1000);
 283
 284         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 285         spin_unlock(&pcipcwd_private.io_lock);
 286
 287         if (!(stat_reg & WD_PCI_WDIS)) {
 288                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
 289                 return -1;
 290         }
 291
 292         if (debug >= VERBOSE)
 293                 printk(KERN_DEBUG PFX "Watchdog stopped\n");
 294
 295         return 0;
 296 }
 297
 298 static int pcipcwd_keepalive(void)
 299 {
 300         /* Re-trigger watchdog by writing to port 0 */
 301         spin_lock(&pcipcwd_private.io_lock);
 302         outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
 303         spin_unlock(&pcipcwd_private.io_lock);
 304
 305         if (debug >= DEBUG)
 306                 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
 307
 308         return 0;
 309 }
 310
 311 static int pcipcwd_set_heartbeat(int t)
 312 {
 313         int t_msb = t / 256;
 314         int t_lsb = t % 256;
 315
 316         if ((t < 0x0001) || (t > 0xFFFF))
 317                 return -EINVAL;
 318
 319         /* Write new heartbeat to watchdog */
 320         send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 321
 322         heartbeat = t;
 323         if (debug >= VERBOSE)
 324                 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
 325                        heartbeat);
 326
 327         return 0;
 328 }
 329
 330 static int pcipcwd_get_status(int *status)
 331 {
 332         int control_status;
 333
 334         *status=0;
 335         control_status = inb_p(pcipcwd_private.io_addr + 1);
 336         if (control_status & WD_PCI_WTRP)
 337                 *status |= WDIOF_CARDRESET;
 338         if (control_status & WD_PCI_TTRP) {
 339                 *status |= WDIOF_OVERHEAT;
 340                 if (temp_panic)
 341                         panic(PFX "Temperature overheat trip!\n");
 342         }
 343
 344         if (debug >= DEBUG)
 345                 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
 346                        control_status);
 347
 348         return 0;
 349 }
 350
 351 static int pcipcwd_clear_status(void)
 352 {
 353         int control_status;
 354         int msb;
 355         int reset_counter;
 356
 357         if (debug >= VERBOSE)
 358                 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
 359
 360         control_status = inb_p(pcipcwd_private.io_addr + 1);
 361
 362         if (debug >= DEBUG) {
 363                 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
 364                 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
 365                        (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
 366         }
 367
 368         /* clear trip status & LED and keep mode of relay 2 */
 369         outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1);
 370
 371         /* clear reset counter */
 372         msb=0;
 373         reset_counter=0xff;
 374         send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
 375
 376         if (debug >= DEBUG) {
 377                 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
 378                        reset_counter);
 379         }
 380
 381         return 0;
 382 }
 383
 384 static int pcipcwd_get_temperature(int *temperature)
 385 {
 386         *temperature = 0;
 387         if (!pcipcwd_private.supports_temp)
 388                 return -ENODEV;
 389
 390         spin_lock(&pcipcwd_private.io_lock);
 391         *temperature = inb_p(pcipcwd_private.io_addr);
 392         spin_unlock(&pcipcwd_private.io_lock);
 393
 394         /*
 395          * Convert celsius to fahrenheit, since this was
 396          * the decided 'standard' for this return value.
 397          */
 398         *temperature = (*temperature * 9 / 5) + 32;
 399
 400         if (debug >= DEBUG) {
 401                 printk(KERN_DEBUG PFX "temperature is: %d F\n",
 402                        *temperature);
 403         }
 404
 405         return 0;
 406 }
 407
 408 static int pcipcwd_get_timeleft(int *time_left)
 409 {
 410         int msb;
 411         int lsb;
 412
 413         /* Read the time that's left before rebooting */
 414         /* Note: if the board is not yet armed then we will read 0xFFFF */
 415         send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
 416
 417         *time_left = (msb << 8) + lsb;
 418
 419         if (debug >= VERBOSE)
 420                 printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
 421                        *time_left);
 422
 423         return 0;
 424 }
 425
 426 /*
 427  *      /dev/watchdog handling
 428  */
 429
 430 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 431                              size_t len, loff_t *ppos)
 432 {
 433         /* See if we got the magic character 'V' and reload the timer */
 434         if (len) {
 435                 if (!nowayout) {
 436                         size_t i;
 437
 438                         /* note: just in case someone wrote the magic character
 439                          * five months ago... */
 440                         expect_release = 0;
 441
 442                         /* scan to see whether or not we got the magic character */
 443                         for (i = 0; i != len; i++) {
 444                                 char c;
 445                                 if(get_user(c, data+i))
 446                                         return -EFAULT;
 447                                 if (c == 'V')
 448                                         expect_release = 42;
 449                         }
 450                 }
 451
 452                 /* someone wrote to us, we should reload the timer */
 453                 pcipcwd_keepalive();
 454         }
 455         return len;
 456 }
 457
 458 static int pcipcwd_ioctl(struct inode *inode, struct file *file,
 459                           unsigned int cmd, unsigned long arg)
 460 {
 461         void __user *argp = (void __user *)arg;
 462         int __user *p = argp;
 463         static struct watchdog_info ident = {
 464                 .options =              WDIOF_OVERHEAT |
 465                                         WDIOF_CARDRESET |
 466                                         WDIOF_KEEPALIVEPING |
 467                                         WDIOF_SETTIMEOUT |
 468                                         WDIOF_MAGICCLOSE,
 469                 .firmware_version =     1,
 470                 .identity =             WATCHDOG_DRIVER_NAME,
 471         };
 472
 473         switch (cmd) {
 474                 case WDIOC_GETSUPPORT:
 475                         return copy_to_user(argp, &ident,
 476                                 sizeof (ident)) ? -EFAULT : 0;
 477
 478                 case WDIOC_GETSTATUS:
 479                 {
 480                         int status;
 481
 482                         pcipcwd_get_status(&status);
 483
 484                         return put_user(status, p);
 485                 }
 486
 487                 case WDIOC_GETBOOTSTATUS:
 488                         return put_user(pcipcwd_private.boot_status, p);
 489
 490                 case WDIOC_GETTEMP:
 491                 {
 492                         int temperature;
 493
 494                         if (pcipcwd_get_temperature(&temperature))
 495                                 return -EFAULT;
 496
 497                         return put_user(temperature, p);
 498                 }
 499
 500                 case WDIOC_KEEPALIVE:
 501                         pcipcwd_keepalive();
 502                         return 0;
 503
 504                 case WDIOC_SETOPTIONS:
 505                 {
 506                         int new_options, retval = -EINVAL;
 507
 508                         if (get_user (new_options, p))
 509                                 return -EFAULT;
 510
 511                         if (new_options & WDIOS_DISABLECARD) {
 512                                 if (pcipcwd_stop())
 513                                         return -EIO;
 514                                 retval = 0;
 515                         }
 516
 517                         if (new_options & WDIOS_ENABLECARD) {
 518                                 if (pcipcwd_start())
 519                                         return -EIO;
 520                                 retval = 0;
 521                         }
 522
 523                         if (new_options & WDIOS_TEMPPANIC) {
 524                                 temp_panic = 1;
 525                                 retval = 0;
 526                         }
 527
 528                         return retval;
 529                 }
 530
 531                 case WDIOC_SETTIMEOUT:
 532                 {
 533                         int new_heartbeat;
 534
 535                         if (get_user(new_heartbeat, p))
 536                                 return -EFAULT;
 537
 538                         if (pcipcwd_set_heartbeat(new_heartbeat))
 539                             return -EINVAL;
 540
 541                         pcipcwd_keepalive();
 542                         /* Fall */
 543                 }
 544
 545                 case WDIOC_GETTIMEOUT:
 546                         return put_user(heartbeat, p);
 547
 548                 case WDIOC_GETTIMELEFT:
 549                 {
 550                         int time_left;
 551
 552                         if (pcipcwd_get_timeleft(&time_left))
 553                                 return -EFAULT;
 554
 555                         return put_user(time_left, p);
 556                 }
 557
 558                 default:
 559                         return -ENOTTY;
 560         }
 561 }
 562
 563 static int pcipcwd_open(struct inode *inode, struct file *file)
 564 {
 565         /* /dev/watchdog can only be opened once */
 566         if (test_and_set_bit(0, &is_active)) {
 567                 if (debug >= VERBOSE)
 568                         printk(KERN_ERR PFX "Attempt to open already opened device.\n");
 569                 return -EBUSY;
 570         }
 571
 572         /* Activate */
 573         pcipcwd_start();
 574         pcipcwd_keepalive();
 575         return nonseekable_open(inode, file);
 576 }
 577
 578 static int pcipcwd_release(struct inode *inode, struct file *file)
 579 {
 580         /*
 581          *      Shut off the timer.
 582          */
 583         if (expect_release == 42) {
 584                 pcipcwd_stop();
 585         } else {
 586                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
 587                 pcipcwd_keepalive();
 588         }
 589         expect_release = 0;
 590         clear_bit(0, &is_active);
 591         return 0;
 592 }
 593
 594 /*
 595  *      /dev/temperature handling
 596  */
 597
 598 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 599                                 size_t len, loff_t *ppos)
 600 {
 601         int temperature;
 602
 603         if (pcipcwd_get_temperature(&temperature))
 604                 return -EFAULT;
 605
 606         if (copy_to_user (data, &temperature, 1))
 607                 return -EFAULT;
 608
 609         return 1;
 610 }
 611
 612 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 613 {
 614         if (!pcipcwd_private.supports_temp)
 615                 return -ENODEV;
 616
 617         return nonseekable_open(inode, file);
 618 }
 619
 620 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 621 {
 622         return 0;
 623 }
 624
 625 /*
 626  *      Notify system
 627  */
 628
 629 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
 630 {
 631         if (code==SYS_DOWN || code==SYS_HALT) {
 632                 /* Turn the WDT off */
 633                 pcipcwd_stop();
 634         }
 635
 636         return NOTIFY_DONE;
 637 }
 638
 639 /*
 640  *      Kernel Interfaces
 641  */
 642
 643 static const struct file_operations pcipcwd_fops = {
 644         .owner =        THIS_MODULE,
 645         .llseek =       no_llseek,
 646         .write =        pcipcwd_write,
 647         .ioctl =        pcipcwd_ioctl,
 648         .open =         pcipcwd_open,
 649         .release =      pcipcwd_release,
 650 };
 651
 652 static struct miscdevice pcipcwd_miscdev = {
 653         .minor =        WATCHDOG_MINOR,
 654         .name =         "watchdog",
 655         .fops =         &pcipcwd_fops,
 656 };
 657
 658 static const struct file_operations pcipcwd_temp_fops = {
 659         .owner =        THIS_MODULE,
 660         .llseek =       no_llseek,
 661         .read =         pcipcwd_temp_read,
 662         .open =         pcipcwd_temp_open,
 663         .release =      pcipcwd_temp_release,
 664 };
 665
 666 static struct miscdevice pcipcwd_temp_miscdev = {
 667         .minor =        TEMP_MINOR,
 668         .name =         "temperature",
 669         .fops =         &pcipcwd_temp_fops,
 670 };
 671
 672 static struct notifier_block pcipcwd_notifier = {
 673         .notifier_call =        pcipcwd_notify_sys,
 674 };
 675
 676 /*
 677  *      Init & exit routines
 678  */
 679
 680 static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 681                 const struct pci_device_id *ent)
 682 {
 683         int ret = -EIO;
 684
 685         cards_found++;
 686         if (cards_found == 1)
 687                 printk(KERN_INFO PFX DRIVER_VERSION);
 688
 689         if (cards_found > 1) {
 690                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
 691                 return -ENODEV;
 692         }
 693
 694         if (pci_enable_device(pdev)) {
 695                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 696                 return -ENODEV;
 697         }
 698
 699         if (pci_resource_start(pdev, 0) == 0x0000) {
 700                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 701                 ret = -ENODEV;
 702                 goto err_out_disable_device;
 703         }
 704
 705         pcipcwd_private.pdev = pdev;
 706         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 707
 708         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 709                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 710                         (int) pcipcwd_private.io_addr);
 711                 ret = -EIO;
 712                 goto err_out_disable_device;
 713         }
 714
 715         /* get the boot_status */
 716         pcipcwd_get_status(&pcipcwd_private.boot_status);
 717
 718         /* clear the "card caused reboot" flag */
 719         pcipcwd_clear_status();
 720
 721         /* disable card */
 722         pcipcwd_stop();
 723
 724         /* Check whether or not the card supports the temperature device */
 725         pcipcwd_check_temperature_support();
 726
 727         /* Show info about the card itself */
 728         pcipcwd_show_card_info();
 729
 730         /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
 731         if (heartbeat == 0)
 732                 heartbeat = heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
 733
 734         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 735         if (pcipcwd_set_heartbeat(heartbeat)) {
 736                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 737                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 738                         WATCHDOG_HEARTBEAT);
 739         }
 740
 741         ret = register_reboot_notifier(&pcipcwd_notifier);
 742         if (ret != 0) {
 743                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 744                         ret);
 745                 goto err_out_release_region;
 746         }
 747
 748         if (pcipcwd_private.supports_temp) {
 749                 ret = misc_register(&pcipcwd_temp_miscdev);
 750                 if (ret != 0) {
 751                         printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 752                                 TEMP_MINOR, ret);
 753                         goto err_out_unregister_reboot;
 754                 }
 755         }
 756
 757         ret = misc_register(&pcipcwd_miscdev);
 758         if (ret != 0) {
 759                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 760                         WATCHDOG_MINOR, ret);
 761                 goto err_out_misc_deregister;
 762         }
 763
 764         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 765                 heartbeat, nowayout);
 766
 767         return 0;
 768
 769 err_out_misc_deregister:
 770         if (pcipcwd_private.supports_temp)
 771                 misc_deregister(&pcipcwd_temp_miscdev);
 772 err_out_unregister_reboot:
 773         unregister_reboot_notifier(&pcipcwd_notifier);
 774 err_out_release_region:
 775         pci_release_regions(pdev);
 776 err_out_disable_device:
 777         pci_disable_device(pdev);
 778         return ret;
 779 }
 780
 781 static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 782 {
 783         /* Stop the timer before we leave */
 784         if (!nowayout)
 785                 pcipcwd_stop();
 786
 787         /* Deregister */
 788         misc_deregister(&pcipcwd_miscdev);
 789         if (pcipcwd_private.supports_temp)
 790                 misc_deregister(&pcipcwd_temp_miscdev);
 791         unregister_reboot_notifier(&pcipcwd_notifier);
 792         pci_release_regions(pdev);
 793         pci_disable_device(pdev);
 794         cards_found--;
 795 }
 796
 797 static struct pci_device_id pcipcwd_pci_tbl[] = {
 798         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 799                 PCI_ANY_ID, PCI_ANY_ID, },
 800         { 0 },                  /* End of list */
 801 };
 802 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 803
 804 static struct pci_driver pcipcwd_driver = {
 805         .name           = WATCHDOG_NAME,
 806         .id_table       = pcipcwd_pci_tbl,
 807         .probe          = pcipcwd_card_init,
 808         .remove         = __devexit_p(pcipcwd_card_exit),
 809 };
 810
 811 static int __init pcipcwd_init_module(void)
 812 {
 813         spin_lock_init(&pcipcwd_private.io_lock);
 814
 815         return pci_register_driver(&pcipcwd_driver);
 816 }
 817
 818 static void __exit pcipcwd_cleanup_module(void)
 819 {
 820         pci_unregister_driver(&pcipcwd_driver);
 821
 822         printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
 823 }
 824
 825 module_init(pcipcwd_init_module);
 826 module_exit(pcipcwd_cleanup_module);
 827
 828 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 829 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 830 MODULE_LICENSE("GPL");
 831 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 832 MODULE_ALIAS_MISCDEV(TEMP_MINOR);