drivers/char/watchdog/pcwd_pci.c

   1 /*
   2  *      Berkshire PCI-PC Watchdog Card Driver
   3  *
   4  *      (c) Copyright 2003-2005 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/config.h>       /* For CONFIG_WATCHDOG_NOWAYOUT/... */
  35 #include <linux/module.h>       /* For module specific items */
  36 #include <linux/moduleparam.h>  /* For new moduleparam's */
  37 #include <linux/types.h>        /* For standard types (like size_t) */
  38 #include <linux/errno.h>        /* For the -ENODEV/... values */
  39 #include <linux/kernel.h>       /* For printk/panic/... */
  40 #include <linux/delay.h>        /* For mdelay function */
  41 #include <linux/miscdevice.h>   /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
  42 #include <linux/watchdog.h>     /* For the watchdog specific items */
  43 #include <linux/notifier.h>     /* For notifier support */
  44 #include <linux/reboot.h>       /* For reboot_notifier stuff */
  45 #include <linux/init.h>         /* For __init/__exit/... */
  46 #include <linux/fs.h>           /* For file operations */
  47 #include <linux/pci.h>          /* For pci functions */
  48 #include <linux/ioport.h>       /* For io-port access */
  49 #include <linux/spinlock.h>     /* For spin_lock/spin_unlock/... */
  50
  51 #include <asm/uaccess.h>        /* For copy_to_user/put_user/... */
  52 #include <asm/io.h>             /* For inb/outb/... */
  53
  54 /* Module and version information */
  55 #define WATCHDOG_VERSION "1.02"
  56 #define WATCHDOG_DATE "03 Sep 2005"
  57 #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
  58 #define WATCHDOG_NAME "pcwd_pci"
  59 #define PFX WATCHDOG_NAME ": "
  60 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION " (" WATCHDOG_DATE ")\n"
  61
  62 /* Stuff for the PCI ID's  */
  63 #ifndef PCI_VENDOR_ID_QUICKLOGIC
  64 #define PCI_VENDOR_ID_QUICKLOGIC    0x11e3
  65 #endif
  66
  67 #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
  68 #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
  69 #endif
  70
  71 /*
  72  * These are the defines that describe the control status bits for the
  73  * PCI-PC Watchdog card.
  74  */
  75 /* Port 1 : Control Status #1 */
  76 #define WD_PCI_WTRP             0x01    /* Watchdog Trip status */
  77 #define WD_PCI_HRBT             0x02    /* Watchdog Heartbeat */
  78 #define WD_PCI_TTRP             0x04    /* Temperature Trip status */
  79 #define WD_PCI_RL2A             0x08    /* Relay 2 Active */
  80 #define WD_PCI_RL1A             0x10    /* Relay 1 Active */
  81 #define WD_PCI_R2DS             0x40    /* Relay 2 Disable Temperature-trip/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 /* We can only use 1 card due to the /dev/watchdog restriction */
 101 static int cards_found;
 102
 103 /* internal variables */
 104 static int temp_panic;
 105 static unsigned long is_active;
 106 static char expect_release;
 107 static struct {                         /* this is private data for each PCI-PC watchdog card */
 108         int supports_temp;              /* Wether or not the card has a temperature device */
 109         int boot_status;                /* The card's boot status */
 110         unsigned long io_addr;          /* The cards I/O address */
 111         spinlock_t io_lock;             /* the lock for io operations */
 112         struct pci_dev *pdev;           /* the PCI-device */
 113 } pcipcwd_private;
 114
 115 /* module parameters */
 116 #define QUIET   0       /* Default */
 117 #define VERBOSE 1       /* Verbose */
 118 #define DEBUG   2       /* print fancy stuff too */
 119 static int debug = QUIET;
 120 module_param(debug, int, 0);
 121 MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
 122
 123 #define WATCHDOG_HEARTBEAT 2    /* 2 sec default heartbeat */
 124 static int heartbeat = WATCHDOG_HEARTBEAT;
 125 module_param(heartbeat, int, 0);
 126 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 127
 128 static int nowayout = WATCHDOG_NOWAYOUT;
 129 module_param(nowayout, int, 0);
 130 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_WATCHDOG_NOWAYOUT)");
 131
 132 /*
 133  *      Internal functions
 134  */
 135
 136 static int send_command(int cmd, int *msb, int *lsb)
 137 {
 138         int got_response, count;
 139
 140         if (debug >= DEBUG)
 141                 printk(KERN_DEBUG PFX "sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
 142                 cmd, *msb, *lsb);
 143
 144         spin_lock(&pcipcwd_private.io_lock);
 145         /* If a command requires data it should be written first.
 146          * Data for commands with 8 bits of data should be written to port 4.
 147          * Commands with 16 bits of data, should be written as LSB to port 4
 148          * and MSB to port 5.
 149          * After the required data has been written then write the command to
 150          * port 6. */
 151         outb_p(*lsb, pcipcwd_private.io_addr + 4);
 152         outb_p(*msb, pcipcwd_private.io_addr + 5);
 153         outb_p(cmd, pcipcwd_private.io_addr + 6);
 154
 155         /* wait till the pci card processed the command, signaled by
 156          * the WRSP bit in port 2 and give it a max. timeout of
 157          * PCI_COMMAND_TIMEOUT to process */
 158         got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 159         for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); count++) {
 160                 mdelay(1);
 161                 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 162         }
 163
 164         if (debug >= DEBUG) {
 165                 if (got_response) {
 166                         printk(KERN_DEBUG PFX "time to process command was: %d ms\n",
 167                                 count);
 168                 } else {
 169                         printk(KERN_DEBUG PFX "card did not respond on command!\n");
 170                 }
 171         }
 172
 173         if (got_response) {
 174                 /* read back response */
 175                 *lsb = inb_p(pcipcwd_private.io_addr + 4);
 176                 *msb = inb_p(pcipcwd_private.io_addr + 5);
 177
 178                 /* clear WRSP bit */
 179                 inb_p(pcipcwd_private.io_addr + 6);
 180
 181                 if (debug >= DEBUG)
 182                         printk(KERN_DEBUG PFX "received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
 183                                 cmd, *msb, *lsb);
 184         }
 185
 186         spin_unlock(&pcipcwd_private.io_lock);
 187
 188         return got_response;
 189 }
 190
 191 static inline void pcipcwd_check_temperature_support(void)
 192 {
 193         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 194                 pcipcwd_private.supports_temp = 1;
 195 }
 196
 197 static int pcipcwd_get_option_switches(void)
 198 {
 199         int option_switches;
 200
 201         option_switches = inb_p(pcipcwd_private.io_addr + 3);
 202         return option_switches;
 203 }
 204
 205 static void pcipcwd_show_card_info(void)
 206 {
 207         int got_fw_rev, fw_rev_major, fw_rev_minor;
 208         char fw_ver_str[20];            /* The cards firmware version */
 209         int option_switches;
 210
 211         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, &fw_rev_minor);
 212         if (got_fw_rev) {
 213                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 214         } else {
 215                 sprintf(fw_ver_str, "<card no answer>");
 216         }
 217
 218         /* Get switch settings */
 219         option_switches = pcipcwd_get_option_switches();
 220
 221         printk(KERN_INFO PFX "Found card at port 0x%04x (Firmware: %s) %s temp option\n",
 222                 (int) pcipcwd_private.io_addr, fw_ver_str,
 223                 (pcipcwd_private.supports_temp ? "with" : "without"));
 224
 225         printk(KERN_INFO PFX "Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 226                 option_switches,
 227                 ((option_switches & 0x10) ? "ON" : "OFF"),
 228                 ((option_switches & 0x08) ? "ON" : "OFF"));
 229
 230         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 231                 printk(KERN_INFO PFX "Previous reset was caused by the Watchdog card\n");
 232
 233         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 234                 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 235
 236         if (pcipcwd_private.boot_status == 0)
 237                 printk(KERN_INFO PFX "No previous trip detected - Cold boot or reset\n");
 238 }
 239
 240 static int pcipcwd_start(void)
 241 {
 242         int stat_reg;
 243
 244         spin_lock(&pcipcwd_private.io_lock);
 245         outb_p(0x00, pcipcwd_private.io_addr + 3);
 246         udelay(1000);
 247
 248         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 249         spin_unlock(&pcipcwd_private.io_lock);
 250
 251         if (stat_reg & WD_PCI_WDIS) {
 252                 printk(KERN_ERR PFX "Card timer not enabled\n");
 253                 return -1;
 254         }
 255
 256         if (debug >= VERBOSE)
 257                 printk(KERN_DEBUG PFX "Watchdog started\n");
 258
 259         return 0;
 260 }
 261
 262 static int pcipcwd_stop(void)
 263 {
 264         int stat_reg;
 265
 266         spin_lock(&pcipcwd_private.io_lock);
 267         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 268         udelay(1000);
 269
 270         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 271         udelay(1000);
 272
 273         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 274         spin_unlock(&pcipcwd_private.io_lock);
 275
 276         if (!(stat_reg & WD_PCI_WDIS)) {
 277                 printk(KERN_ERR PFX "Card did not acknowledge disable attempt\n");
 278                 return -1;
 279         }
 280
 281         if (debug >= VERBOSE)
 282                 printk(KERN_DEBUG PFX "Watchdog stopped\n");
 283
 284         return 0;
 285 }
 286
 287 static int pcipcwd_keepalive(void)
 288 {
 289         /* Re-trigger watchdog by writing to port 0 */
 290         outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
 291
 292         if (debug >= DEBUG)
 293                 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
 294
 295         return 0;
 296 }
 297
 298 static int pcipcwd_set_heartbeat(int t)
 299 {
 300         int t_msb = t / 256;
 301         int t_lsb = t % 256;
 302
 303         if ((t < 0x0001) || (t > 0xFFFF))
 304                 return -EINVAL;
 305
 306         /* Write new heartbeat to watchdog */
 307         send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 308
 309         heartbeat = t;
 310         if (debug >= VERBOSE)
 311                 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
 312                        heartbeat);
 313
 314         return 0;
 315 }
 316
 317 static int pcipcwd_get_status(int *status)
 318 {
 319         int control_status;
 320
 321         *status=0;
 322         control_status = inb_p(pcipcwd_private.io_addr + 1);
 323         if (control_status & WD_PCI_WTRP)
 324                 *status |= WDIOF_CARDRESET;
 325         if (control_status & WD_PCI_TTRP) {
 326                 *status |= WDIOF_OVERHEAT;
 327                 if (temp_panic)
 328                         panic(PFX "Temperature overheat trip!\n");
 329         }
 330
 331         if (debug >= DEBUG)
 332                 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
 333                        control_status);
 334
 335         return 0;
 336 }
 337
 338 static int pcipcwd_clear_status(void)
 339 {
 340         int control_status;
 341         int msb;
 342         int reset_counter;
 343
 344         if (debug >= VERBOSE)
 345                 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
 346
 347         control_status = inb_p(pcipcwd_private.io_addr + 1);
 348
 349         if (debug >= DEBUG) {
 350                 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
 351                 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
 352                        (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
 353         }
 354
 355         /* clear trip status & LED and keep mode of relay 2 */
 356         outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, pcipcwd_private.io_addr + 1);
 357
 358         /* clear reset counter */
 359         msb=0;
 360         reset_counter=0xff;
 361         send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
 362
 363         if (debug >= DEBUG) {
 364                 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
 365                        reset_counter);
 366         }
 367
 368         return 0;
 369 }
 370
 371 static int pcipcwd_get_temperature(int *temperature)
 372 {
 373         *temperature = 0;
 374         if (!pcipcwd_private.supports_temp)
 375                 return -ENODEV;
 376
 377         *temperature = inb_p(pcipcwd_private.io_addr);
 378
 379         /*
 380          * Convert celsius to fahrenheit, since this was
 381          * the decided 'standard' for this return value.
 382          */
 383         *temperature = (*temperature * 9 / 5) + 32;
 384
 385         if (debug >= DEBUG) {
 386                 printk(KERN_DEBUG PFX "temperature is: %d F\n",
 387                        *temperature);
 388         }
 389
 390         return 0;
 391 }
 392
 393 static int pcipcwd_get_timeleft(int *time_left)
 394 {
 395         int msb;
 396         int lsb;
 397
 398         /* Read the time that's left before rebooting */
 399         /* Note: if the board is not yet armed then we will read 0xFFFF */
 400         send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
 401
 402         *time_left = (msb << 8) + lsb;
 403
 404         if (debug >= VERBOSE)
 405                 printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
 406                        *time_left);
 407
 408         return 0;
 409 }
 410
 411 /*
 412  *      /dev/watchdog handling
 413  */
 414
 415 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 416                              size_t len, loff_t *ppos)
 417 {
 418         /* See if we got the magic character 'V' and reload the timer */
 419         if (len) {
 420                 if (!nowayout) {
 421                         size_t i;
 422
 423                         /* note: just in case someone wrote the magic character
 424                          * five months ago... */
 425                         expect_release = 0;
 426
 427                         /* scan to see whether or not we got the magic character */
 428                         for (i = 0; i != len; i++) {
 429                                 char c;
 430                                 if(get_user(c, data+i))
 431                                         return -EFAULT;
 432                                 if (c == 'V')
 433                                         expect_release = 42;
 434                         }
 435                 }
 436
 437                 /* someone wrote to us, we should reload the timer */
 438                 pcipcwd_keepalive();
 439         }
 440         return len;
 441 }
 442
 443 static int pcipcwd_ioctl(struct inode *inode, struct file *file,
 444                           unsigned int cmd, unsigned long arg)
 445 {
 446         void __user *argp = (void __user *)arg;
 447         int __user *p = argp;
 448         static struct watchdog_info ident = {
 449                 .options =              WDIOF_OVERHEAT |
 450                                         WDIOF_CARDRESET |
 451                                         WDIOF_KEEPALIVEPING |
 452                                         WDIOF_SETTIMEOUT |
 453                                         WDIOF_MAGICCLOSE,
 454                 .firmware_version =     1,
 455                 .identity =             WATCHDOG_DRIVER_NAME,
 456         };
 457
 458         switch (cmd) {
 459                 case WDIOC_GETSUPPORT:
 460                         return copy_to_user(argp, &ident,
 461                                 sizeof (ident)) ? -EFAULT : 0;
 462
 463                 case WDIOC_GETSTATUS:
 464                 {
 465                         int status;
 466
 467                         pcipcwd_get_status(&status);
 468
 469                         return put_user(status, p);
 470                 }
 471
 472                 case WDIOC_GETBOOTSTATUS:
 473                         return put_user(pcipcwd_private.boot_status, p);
 474
 475                 case WDIOC_GETTEMP:
 476                 {
 477                         int temperature;
 478
 479                         if (pcipcwd_get_temperature(&temperature))
 480                                 return -EFAULT;
 481
 482                         return put_user(temperature, p);
 483                 }
 484
 485                 case WDIOC_KEEPALIVE:
 486                         pcipcwd_keepalive();
 487                         return 0;
 488
 489                 case WDIOC_SETOPTIONS:
 490                 {
 491                         int new_options, retval = -EINVAL;
 492
 493                         if (get_user (new_options, p))
 494                                 return -EFAULT;
 495
 496                         if (new_options & WDIOS_DISABLECARD) {
 497                                 if (pcipcwd_stop())
 498                                         return -EIO;
 499                                 retval = 0;
 500                         }
 501
 502                         if (new_options & WDIOS_ENABLECARD) {
 503                                 if (pcipcwd_start())
 504                                         return -EIO;
 505                                 retval = 0;
 506                         }
 507
 508                         if (new_options & WDIOS_TEMPPANIC) {
 509                                 temp_panic = 1;
 510                                 retval = 0;
 511                         }
 512
 513                         return retval;
 514                 }
 515
 516                 case WDIOC_SETTIMEOUT:
 517                 {
 518                         int new_heartbeat;
 519
 520                         if (get_user(new_heartbeat, p))
 521                                 return -EFAULT;
 522
 523                         if (pcipcwd_set_heartbeat(new_heartbeat))
 524                             return -EINVAL;
 525
 526                         pcipcwd_keepalive();
 527                         /* Fall */
 528                 }
 529
 530                 case WDIOC_GETTIMEOUT:
 531                         return put_user(heartbeat, p);
 532
 533                 case WDIOC_GETTIMELEFT:
 534                 {
 535                         int time_left;
 536
 537                         if (pcipcwd_get_timeleft(&time_left))
 538                                 return -EFAULT;
 539
 540                         return put_user(time_left, p);
 541                 }
 542
 543                 default:
 544                         return -ENOIOCTLCMD;
 545         }
 546 }
 547
 548 static int pcipcwd_open(struct inode *inode, struct file *file)
 549 {
 550         /* /dev/watchdog can only be opened once */
 551         if (test_and_set_bit(0, &is_active)) {
 552                 if (debug >= VERBOSE)
 553                         printk(KERN_ERR PFX "Attempt to open already opened device.\n");
 554                 return -EBUSY;
 555         }
 556
 557         /* Activate */
 558         pcipcwd_start();
 559         pcipcwd_keepalive();
 560         return nonseekable_open(inode, file);
 561 }
 562
 563 static int pcipcwd_release(struct inode *inode, struct file *file)
 564 {
 565         /*
 566          *      Shut off the timer.
 567          */
 568         if (expect_release == 42) {
 569                 pcipcwd_stop();
 570         } else {
 571                 printk(KERN_CRIT PFX "Unexpected close, not stopping watchdog!\n");
 572                 pcipcwd_keepalive();
 573         }
 574         expect_release = 0;
 575         clear_bit(0, &is_active);
 576         return 0;
 577 }
 578
 579 /*
 580  *      /dev/temperature handling
 581  */
 582
 583 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 584                                 size_t len, loff_t *ppos)
 585 {
 586         int temperature;
 587
 588         if (pcipcwd_get_temperature(&temperature))
 589                 return -EFAULT;
 590
 591         if (copy_to_user (data, &temperature, 1))
 592                 return -EFAULT;
 593
 594         return 1;
 595 }
 596
 597 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 598 {
 599         if (!pcipcwd_private.supports_temp)
 600                 return -ENODEV;
 601
 602         return nonseekable_open(inode, file);
 603 }
 604
 605 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 606 {
 607         return 0;
 608 }
 609
 610 /*
 611  *      Notify system
 612  */
 613
 614 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, void *unused)
 615 {
 616         if (code==SYS_DOWN || code==SYS_HALT) {
 617                 /* Turn the WDT off */
 618                 pcipcwd_stop();
 619         }
 620
 621         return NOTIFY_DONE;
 622 }
 623
 624 /*
 625  *      Kernel Interfaces
 626  */
 627
 628 static const struct file_operations pcipcwd_fops = {
 629         .owner =        THIS_MODULE,
 630         .llseek =       no_llseek,
 631         .write =        pcipcwd_write,
 632         .ioctl =        pcipcwd_ioctl,
 633         .open =         pcipcwd_open,
 634         .release =      pcipcwd_release,
 635 };
 636
 637 static struct miscdevice pcipcwd_miscdev = {
 638         .minor =        WATCHDOG_MINOR,
 639         .name =         "watchdog",
 640         .fops =         &pcipcwd_fops,
 641 };
 642
 643 static const struct file_operations pcipcwd_temp_fops = {
 644         .owner =        THIS_MODULE,
 645         .llseek =       no_llseek,
 646         .read =         pcipcwd_temp_read,
 647         .open =         pcipcwd_temp_open,
 648         .release =      pcipcwd_temp_release,
 649 };
 650
 651 static struct miscdevice pcipcwd_temp_miscdev = {
 652         .minor =        TEMP_MINOR,
 653         .name =         "temperature",
 654         .fops =         &pcipcwd_temp_fops,
 655 };
 656
 657 static struct notifier_block pcipcwd_notifier = {
 658         .notifier_call =        pcipcwd_notify_sys,
 659 };
 660
 661 /*
 662  *      Init & exit routines
 663  */
 664
 665 static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 666                 const struct pci_device_id *ent)
 667 {
 668         int ret = -EIO;
 669
 670         cards_found++;
 671         if (cards_found == 1)
 672                 printk(KERN_INFO PFX DRIVER_VERSION);
 673
 674         if (cards_found > 1) {
 675                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
 676                 return -ENODEV;
 677         }
 678
 679         if (pci_enable_device(pdev)) {
 680                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 681                 return -ENODEV;
 682         }
 683
 684         if (pci_resource_start(pdev, 0) == 0x0000) {
 685                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 686                 ret = -ENODEV;
 687                 goto err_out_disable_device;
 688         }
 689
 690         pcipcwd_private.pdev = pdev;
 691         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 692
 693         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 694                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 695                         (int) pcipcwd_private.io_addr);
 696                 ret = -EIO;
 697                 goto err_out_disable_device;
 698         }
 699
 700         /* get the boot_status */
 701         pcipcwd_get_status(&pcipcwd_private.boot_status);
 702
 703         /* clear the "card caused reboot" flag */
 704         pcipcwd_clear_status();
 705
 706         /* disable card */
 707         pcipcwd_stop();
 708
 709         /* Check whether or not the card supports the temperature device */
 710         pcipcwd_check_temperature_support();
 711
 712         /* Show info about the card itself */
 713         pcipcwd_show_card_info();
 714
 715         /* Check that the heartbeat value is within it's range ; if not reset to the default */
 716         if (pcipcwd_set_heartbeat(heartbeat)) {
 717                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 718                 printk(KERN_INFO PFX "heartbeat value must be 0<heartbeat<65536, using %d\n",
 719                         WATCHDOG_HEARTBEAT);
 720         }
 721
 722         ret = register_reboot_notifier(&pcipcwd_notifier);
 723         if (ret != 0) {
 724                 printk(KERN_ERR PFX "cannot register reboot notifier (err=%d)\n",
 725                         ret);
 726                 goto err_out_release_region;
 727         }
 728
 729         if (pcipcwd_private.supports_temp) {
 730                 ret = misc_register(&pcipcwd_temp_miscdev);
 731                 if (ret != 0) {
 732                         printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 733                                 TEMP_MINOR, ret);
 734                         goto err_out_unregister_reboot;
 735                 }
 736         }
 737
 738         ret = misc_register(&pcipcwd_miscdev);
 739         if (ret != 0) {
 740                 printk(KERN_ERR PFX "cannot register miscdev on minor=%d (err=%d)\n",
 741                         WATCHDOG_MINOR, ret);
 742                 goto err_out_misc_deregister;
 743         }
 744
 745         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 746                 heartbeat, nowayout);
 747
 748         return 0;
 749
 750 err_out_misc_deregister:
 751         if (pcipcwd_private.supports_temp)
 752                 misc_deregister(&pcipcwd_temp_miscdev);
 753 err_out_unregister_reboot:
 754         unregister_reboot_notifier(&pcipcwd_notifier);
 755 err_out_release_region:
 756         pci_release_regions(pdev);
 757 err_out_disable_device:
 758         pci_disable_device(pdev);
 759         return ret;
 760 }
 761
 762 static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 763 {
 764         /* Stop the timer before we leave */
 765         if (!nowayout)
 766                 pcipcwd_stop();
 767
 768         /* Deregister */
 769         misc_deregister(&pcipcwd_miscdev);
 770         if (pcipcwd_private.supports_temp)
 771                 misc_deregister(&pcipcwd_temp_miscdev);
 772         unregister_reboot_notifier(&pcipcwd_notifier);
 773         pci_release_regions(pdev);
 774         pci_disable_device(pdev);
 775         cards_found--;
 776 }
 777
 778 static struct pci_device_id pcipcwd_pci_tbl[] = {
 779         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 780                 PCI_ANY_ID, PCI_ANY_ID, },
 781         { 0 },                  /* End of list */
 782 };
 783 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 784
 785 static struct pci_driver pcipcwd_driver = {
 786         .name           = WATCHDOG_NAME,
 787         .id_table       = pcipcwd_pci_tbl,
 788         .probe          = pcipcwd_card_init,
 789         .remove         = __devexit_p(pcipcwd_card_exit),
 790 };
 791
 792 static int __init pcipcwd_init_module(void)
 793 {
 794         spin_lock_init(&pcipcwd_private.io_lock);
 795
 796         return pci_register_driver(&pcipcwd_driver);
 797 }
 798
 799 static void __exit pcipcwd_cleanup_module(void)
 800 {
 801         pci_unregister_driver(&pcipcwd_driver);
 802 }
 803
 804 module_init(pcipcwd_init_module);
 805 module_exit(pcipcwd_cleanup_module);
 806
 807 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 808 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 809 MODULE_LICENSE("GPL");
 810 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 811 MODULE_ALIAS_MISCDEV(TEMP_MINOR);