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 #include <linux/module.h>       /* For module specific items */
  36 #include <linux/moduleparam.h>  /* For new moduleparam's */
  37 #include <linux/types.h>        /* For standard types (like size_t) */
  38 #include <linux/errno.h>        /* For the -ENODEV/... values */
  39 #include <linux/kernel.h>       /* For printk/panic/... */
  40 #include <linux/delay.h>        /* For mdelay function */
  41 #include <linux/miscdevice.h>   /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */
  42 #include <linux/watchdog.h>     /* For the watchdog specific items */
  43 #include <linux/notifier.h>     /* For notifier support */
  44 #include <linux/reboot.h>       /* For reboot_notifier stuff */
  45 #include <linux/init.h>         /* For __init/__exit/... */
  46 #include <linux/fs.h>           /* For file operations */
  47 #include <linux/pci.h>          /* For pci functions */
  48 #include <linux/ioport.h>       /* For io-port access */
  49 #include <linux/spinlock.h>     /* For spin_lock/spin_unlock/... */
  50 #include <linux/uaccess.h>      /* For copy_to_user/put_user/... */
  51 #include <linux/io.h>           /* For inb/outb/... */
  52
  53 /* Module and version information */
  54 #define WATCHDOG_VERSION "1.03"
  55 #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
  56 #define WATCHDOG_NAME "pcwd_pci"
  57 #define PFX WATCHDOG_NAME ": "
  58 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n"
  59
  60 /* Stuff for the PCI ID's  */
  61 #ifndef PCI_VENDOR_ID_QUICKLOGIC
  62 #define PCI_VENDOR_ID_QUICKLOGIC    0x11e3
  63 #endif
  64
  65 #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
  66 #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
  67 #endif
  68
  69 /*
  70  * These are the defines that describe the control status bits for the
  71  * PCI-PC Watchdog card.
  72  */
  73 /* Port 1 : Control Status #1 */
  74 #define WD_PCI_WTRP             0x01    /* Watchdog Trip status */
  75 #define WD_PCI_HRBT             0x02    /* Watchdog Heartbeat */
  76 #define WD_PCI_TTRP             0x04    /* Temperature Trip status */
  77 #define WD_PCI_RL2A             0x08    /* Relay 2 Active */
  78 #define WD_PCI_RL1A             0x10    /* Relay 1 Active */
  79 #define WD_PCI_R2DS             0x40    /* Relay 2 Disable Temperature-trip /
  80                                                                         reset */
  81 #define WD_PCI_RLY2             0x80    /* Activate Relay 2 on the board */
  82 /* Port 2 : Control Status #2 */
  83 #define WD_PCI_WDIS             0x10    /* Watchdog Disable */
  84 #define WD_PCI_ENTP             0x20    /* Enable Temperature Trip Reset */
  85 #define WD_PCI_WRSP             0x40    /* Watchdog wrote response */
  86 #define WD_PCI_PCMD             0x80    /* PC has sent command */
  87
  88 /* according to documentation max. time to process a command for the pci
  89  * watchdog card is 100 ms, so we give it 150 ms to do it's job */
  90 #define PCI_COMMAND_TIMEOUT     150
  91
  92 /* Watchdog's internal commands */
  93 #define CMD_GET_STATUS                          0x04
  94 #define CMD_GET_FIRMWARE_VERSION                0x08
  95 #define CMD_READ_WATCHDOG_TIMEOUT               0x18
  96 #define CMD_WRITE_WATCHDOG_TIMEOUT              0x19
  97 #define CMD_GET_CLEAR_RESET_COUNT               0x84
  98
  99 /* Watchdog's Dip Switch heartbeat values */
 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 /* this is private data for each PCI-PC watchdog card */
 119 static struct {
 120         /* Wether or not the card has a temperature device */
 121         int supports_temp;
 122         /* The card's boot status */
 123         int boot_status;
 124         /* The cards I/O address */
 125         unsigned long io_addr;
 126         /* the lock for io operations */
 127         spinlock_t io_lock;
 128         /* the PCI-device */
 129         struct pci_dev *pdev;
 130 } pcipcwd_private;
 131
 132 /* module parameters */
 133 #define QUIET   0       /* Default */
 134 #define VERBOSE 1       /* Verbose */
 135 #define DEBUG   2       /* print fancy stuff too */
 136 static int debug = QUIET;
 137 module_param(debug, int, 0);
 138 MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
 139
 140 #define WATCHDOG_HEARTBEAT 0    /* default heartbeat =
 141                                                 delay-time from dip-switches */
 142 static int heartbeat = WATCHDOG_HEARTBEAT;
 143 module_param(heartbeat, int, 0);
 144 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
 145         "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
 146                                 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 147
 148 static int nowayout = WATCHDOG_NOWAYOUT;
 149 module_param(nowayout, int, 0);
 150 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 151                                         __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 152
 153 /*
 154  *      Internal functions
 155  */
 156
 157 static int send_command(int cmd, int *msb, int *lsb)
 158 {
 159         int got_response, count;
 160
 161         if (debug >= DEBUG)
 162                 printk(KERN_DEBUG PFX "sending following data "
 163                 "cmd=0x%02x msb=0x%02x lsb=0x%02x\n", cmd, *msb, *lsb);
 164
 165         spin_lock(&pcipcwd_private.io_lock);
 166         /* If a command requires data it should be written first.
 167          * Data for commands with 8 bits of data should be written to port 4.
 168          * Commands with 16 bits of data, should be written as LSB to port 4
 169          * and MSB to port 5.
 170          * After the required data has been written then write the command to
 171          * port 6. */
 172         outb_p(*lsb, pcipcwd_private.io_addr + 4);
 173         outb_p(*msb, pcipcwd_private.io_addr + 5);
 174         outb_p(cmd, pcipcwd_private.io_addr + 6);
 175
 176         /* wait till the pci card processed the command, signaled by
 177          * the WRSP bit in port 2 and give it a max. timeout of
 178          * PCI_COMMAND_TIMEOUT to process */
 179         got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 180         for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
 181                                                                 count++) {
 182                 mdelay(1);
 183                 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 184         }
 185
 186         if (debug >= DEBUG) {
 187                 if (got_response) {
 188                         printk(KERN_DEBUG PFX
 189                                 "time to process command was: %d ms\n",
 190                                 count);
 191                 } else {
 192                         printk(KERN_DEBUG PFX
 193                                 "card did not respond on command!\n");
 194                 }
 195         }
 196
 197         if (got_response) {
 198                 /* read back response */
 199                 *lsb = inb_p(pcipcwd_private.io_addr + 4);
 200                 *msb = inb_p(pcipcwd_private.io_addr + 5);
 201
 202                 /* clear WRSP bit */
 203                 inb_p(pcipcwd_private.io_addr + 6);
 204
 205                 if (debug >= DEBUG)
 206                         printk(KERN_DEBUG PFX "received following data for "
 207                                 "cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
 208                                 cmd, *msb, *lsb);
 209         }
 210
 211         spin_unlock(&pcipcwd_private.io_lock);
 212
 213         return got_response;
 214 }
 215
 216 static inline void pcipcwd_check_temperature_support(void)
 217 {
 218         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 219                 pcipcwd_private.supports_temp = 1;
 220 }
 221
 222 static int pcipcwd_get_option_switches(void)
 223 {
 224         int option_switches;
 225
 226         option_switches = inb_p(pcipcwd_private.io_addr + 3);
 227         return option_switches;
 228 }
 229
 230 static void pcipcwd_show_card_info(void)
 231 {
 232         int got_fw_rev, fw_rev_major, fw_rev_minor;
 233         char fw_ver_str[20];            /* The cards firmware version */
 234         int option_switches;
 235
 236         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
 237                                                                 &fw_rev_minor);
 238         if (got_fw_rev)
 239                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 240         else
 241                 sprintf(fw_ver_str, "<card no answer>");
 242
 243         /* Get switch settings */
 244         option_switches = pcipcwd_get_option_switches();
 245
 246         printk(KERN_INFO PFX "Found card at port "
 247                 "0x%04x (Firmware: %s) %s temp option\n",
 248                 (int) pcipcwd_private.io_addr, fw_ver_str,
 249                 (pcipcwd_private.supports_temp ? "with" : "without"));
 250
 251         printk(KERN_INFO PFX "Option switches (0x%02x): "
 252                 "Temperature Reset Enable=%s, Power On Delay=%s\n",
 253                 option_switches,
 254                 ((option_switches & 0x10) ? "ON" : "OFF"),
 255                 ((option_switches & 0x08) ? "ON" : "OFF"));
 256
 257         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 258                 printk(KERN_INFO PFX
 259                         "Previous reset was caused by the Watchdog card\n");
 260
 261         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 262                 printk(KERN_INFO PFX "Card sensed a CPU Overheat\n");
 263
 264         if (pcipcwd_private.boot_status == 0)
 265                 printk(KERN_INFO PFX
 266                         "No previous trip detected - Cold boot or reset\n");
 267 }
 268
 269 static int pcipcwd_start(void)
 270 {
 271         int stat_reg;
 272
 273         spin_lock(&pcipcwd_private.io_lock);
 274         outb_p(0x00, pcipcwd_private.io_addr + 3);
 275         udelay(1000);
 276
 277         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 278         spin_unlock(&pcipcwd_private.io_lock);
 279
 280         if (stat_reg & WD_PCI_WDIS) {
 281                 printk(KERN_ERR PFX "Card timer not enabled\n");
 282                 return -1;
 283         }
 284
 285         if (debug >= VERBOSE)
 286                 printk(KERN_DEBUG PFX "Watchdog started\n");
 287
 288         return 0;
 289 }
 290
 291 static int pcipcwd_stop(void)
 292 {
 293         int stat_reg;
 294
 295         spin_lock(&pcipcwd_private.io_lock);
 296         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 297         udelay(1000);
 298
 299         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 300         udelay(1000);
 301
 302         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 303         spin_unlock(&pcipcwd_private.io_lock);
 304
 305         if (!(stat_reg & WD_PCI_WDIS)) {
 306                 printk(KERN_ERR PFX
 307                         "Card did not acknowledge disable attempt\n");
 308                 return -1;
 309         }
 310
 311         if (debug >= VERBOSE)
 312                 printk(KERN_DEBUG PFX "Watchdog stopped\n");
 313
 314         return 0;
 315 }
 316
 317 static int pcipcwd_keepalive(void)
 318 {
 319         /* Re-trigger watchdog by writing to port 0 */
 320         spin_lock(&pcipcwd_private.io_lock);
 321         outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
 322         spin_unlock(&pcipcwd_private.io_lock);
 323
 324         if (debug >= DEBUG)
 325                 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n");
 326
 327         return 0;
 328 }
 329
 330 static int pcipcwd_set_heartbeat(int t)
 331 {
 332         int t_msb = t / 256;
 333         int t_lsb = t % 256;
 334
 335         if ((t < 0x0001) || (t > 0xFFFF))
 336                 return -EINVAL;
 337
 338         /* Write new heartbeat to watchdog */
 339         send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 340
 341         heartbeat = t;
 342         if (debug >= VERBOSE)
 343                 printk(KERN_DEBUG PFX "New heartbeat: %d\n",
 344                        heartbeat);
 345
 346         return 0;
 347 }
 348
 349 static int pcipcwd_get_status(int *status)
 350 {
 351         int control_status;
 352
 353         *status = 0;
 354         control_status = inb_p(pcipcwd_private.io_addr + 1);
 355         if (control_status & WD_PCI_WTRP)
 356                 *status |= WDIOF_CARDRESET;
 357         if (control_status & WD_PCI_TTRP) {
 358                 *status |= WDIOF_OVERHEAT;
 359                 if (temp_panic)
 360                         panic(PFX "Temperature overheat trip!\n");
 361         }
 362
 363         if (debug >= DEBUG)
 364                 printk(KERN_DEBUG PFX "Control Status #1: 0x%02x\n",
 365                        control_status);
 366
 367         return 0;
 368 }
 369
 370 static int pcipcwd_clear_status(void)
 371 {
 372         int control_status;
 373         int msb;
 374         int reset_counter;
 375
 376         if (debug >= VERBOSE)
 377                 printk(KERN_INFO PFX "clearing watchdog trip status & LED\n");
 378
 379         control_status = inb_p(pcipcwd_private.io_addr + 1);
 380
 381         if (debug >= DEBUG) {
 382                 printk(KERN_DEBUG PFX "status was: 0x%02x\n", control_status);
 383                 printk(KERN_DEBUG PFX "sending: 0x%02x\n",
 384                        (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
 385         }
 386
 387         /* clear trip status & LED and keep mode of relay 2 */
 388         outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
 389                                                 pcipcwd_private.io_addr + 1);
 390
 391         /* clear reset counter */
 392         msb = 0;
 393         reset_counter = 0xff;
 394         send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
 395
 396         if (debug >= DEBUG) {
 397                 printk(KERN_DEBUG PFX "reset count was: 0x%02x\n",
 398                        reset_counter);
 399         }
 400
 401         return 0;
 402 }
 403
 404 static int pcipcwd_get_temperature(int *temperature)
 405 {
 406         *temperature = 0;
 407         if (!pcipcwd_private.supports_temp)
 408                 return -ENODEV;
 409
 410         spin_lock(&pcipcwd_private.io_lock);
 411         *temperature = inb_p(pcipcwd_private.io_addr);
 412         spin_unlock(&pcipcwd_private.io_lock);
 413
 414         /*
 415          * Convert celsius to fahrenheit, since this was
 416          * the decided 'standard' for this return value.
 417          */
 418         *temperature = (*temperature * 9 / 5) + 32;
 419
 420         if (debug >= DEBUG) {
 421                 printk(KERN_DEBUG PFX "temperature is: %d F\n",
 422                        *temperature);
 423         }
 424
 425         return 0;
 426 }
 427
 428 static int pcipcwd_get_timeleft(int *time_left)
 429 {
 430         int msb;
 431         int lsb;
 432
 433         /* Read the time that's left before rebooting */
 434         /* Note: if the board is not yet armed then we will read 0xFFFF */
 435         send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
 436
 437         *time_left = (msb << 8) + lsb;
 438
 439         if (debug >= VERBOSE)
 440                 printk(KERN_DEBUG PFX "Time left before next reboot: %d\n",
 441                        *time_left);
 442
 443         return 0;
 444 }
 445
 446 /*
 447  *      /dev/watchdog handling
 448  */
 449
 450 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 451                              size_t len, loff_t *ppos)
 452 {
 453         /* See if we got the magic character 'V' and reload the timer */
 454         if (len) {
 455                 if (!nowayout) {
 456                         size_t i;
 457
 458                         /* note: just in case someone wrote the magic character
 459                          * five months ago... */
 460                         expect_release = 0;
 461
 462                         /* scan to see whether or not we got the
 463                          * magic character */
 464                         for (i = 0; i != len; i++) {
 465                                 char c;
 466                                 if (get_user(c, data + i))
 467                                         return -EFAULT;
 468                                 if (c == 'V')
 469                                         expect_release = 42;
 470                         }
 471                 }
 472
 473                 /* someone wrote to us, we should reload the timer */
 474                 pcipcwd_keepalive();
 475         }
 476         return len;
 477 }
 478
 479 static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
 480                                                 unsigned long arg)
 481 {
 482         void __user *argp = (void __user *)arg;
 483         int __user *p = argp;
 484         static const struct watchdog_info ident = {
 485                 .options =              WDIOF_OVERHEAT |
 486                                         WDIOF_CARDRESET |
 487                                         WDIOF_KEEPALIVEPING |
 488                                         WDIOF_SETTIMEOUT |
 489                                         WDIOF_MAGICCLOSE,
 490                 .firmware_version =     1,
 491                 .identity =             WATCHDOG_DRIVER_NAME,
 492         };
 493
 494         switch (cmd) {
 495         case WDIOC_GETSUPPORT:
 496                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 497
 498         case WDIOC_GETSTATUS:
 499         {
 500                 int status;
 501                 pcipcwd_get_status(&status);
 502                 return put_user(status, p);
 503         }
 504
 505         case WDIOC_GETBOOTSTATUS:
 506                 return put_user(pcipcwd_private.boot_status, p);
 507
 508         case WDIOC_GETTEMP:
 509         {
 510                 int temperature;
 511
 512                 if (pcipcwd_get_temperature(&temperature))
 513                         return -EFAULT;
 514
 515                 return put_user(temperature, p);
 516         }
 517
 518         case WDIOC_SETOPTIONS:
 519         {
 520                 int new_options, retval = -EINVAL;
 521
 522                 if (get_user(new_options, p))
 523                         return -EFAULT;
 524
 525                 if (new_options & WDIOS_DISABLECARD) {
 526                         if (pcipcwd_stop())
 527                                 return -EIO;
 528                         retval = 0;
 529                 }
 530
 531                 if (new_options & WDIOS_ENABLECARD) {
 532                         if (pcipcwd_start())
 533                                 return -EIO;
 534                         retval = 0;
 535                 }
 536
 537                 if (new_options & WDIOS_TEMPPANIC) {
 538                         temp_panic = 1;
 539                         retval = 0;
 540                 }
 541
 542                 return retval;
 543         }
 544
 545         case WDIOC_KEEPALIVE:
 546                 pcipcwd_keepalive();
 547                 return 0;
 548
 549         case WDIOC_SETTIMEOUT:
 550         {
 551                 int new_heartbeat;
 552
 553                 if (get_user(new_heartbeat, p))
 554                         return -EFAULT;
 555
 556                 if (pcipcwd_set_heartbeat(new_heartbeat))
 557                         return -EINVAL;
 558
 559                 pcipcwd_keepalive();
 560                 /* Fall */
 561         }
 562
 563         case WDIOC_GETTIMEOUT:
 564                 return put_user(heartbeat, p);
 565
 566         case WDIOC_GETTIMELEFT:
 567         {
 568                 int time_left;
 569
 570                 if (pcipcwd_get_timeleft(&time_left))
 571                         return -EFAULT;
 572
 573                 return put_user(time_left, p);
 574         }
 575
 576         default:
 577                 return -ENOTTY;
 578         }
 579 }
 580
 581 static int pcipcwd_open(struct inode *inode, struct file *file)
 582 {
 583         /* /dev/watchdog can only be opened once */
 584         if (test_and_set_bit(0, &is_active)) {
 585                 if (debug >= VERBOSE)
 586                         printk(KERN_ERR PFX
 587                                 "Attempt to open already opened device.\n");
 588                 return -EBUSY;
 589         }
 590
 591         /* Activate */
 592         pcipcwd_start();
 593         pcipcwd_keepalive();
 594         return nonseekable_open(inode, file);
 595 }
 596
 597 static int pcipcwd_release(struct inode *inode, struct file *file)
 598 {
 599         /*
 600          *      Shut off the timer.
 601          */
 602         if (expect_release == 42) {
 603                 pcipcwd_stop();
 604         } else {
 605                 printk(KERN_CRIT PFX
 606                         "Unexpected close, not stopping watchdog!\n");
 607                 pcipcwd_keepalive();
 608         }
 609         expect_release = 0;
 610         clear_bit(0, &is_active);
 611         return 0;
 612 }
 613
 614 /*
 615  *      /dev/temperature handling
 616  */
 617
 618 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 619                                 size_t len, loff_t *ppos)
 620 {
 621         int temperature;
 622
 623         if (pcipcwd_get_temperature(&temperature))
 624                 return -EFAULT;
 625
 626         if (copy_to_user(data, &temperature, 1))
 627                 return -EFAULT;
 628
 629         return 1;
 630 }
 631
 632 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 633 {
 634         if (!pcipcwd_private.supports_temp)
 635                 return -ENODEV;
 636
 637         return nonseekable_open(inode, file);
 638 }
 639
 640 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 641 {
 642         return 0;
 643 }
 644
 645 /*
 646  *      Notify system
 647  */
 648
 649 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
 650                                                                 void *unused)
 651 {
 652         if (code == SYS_DOWN || code == SYS_HALT)
 653                 pcipcwd_stop(); /* Turn the WDT off */
 654
 655         return NOTIFY_DONE;
 656 }
 657
 658 /*
 659  *      Kernel Interfaces
 660  */
 661
 662 static const struct file_operations pcipcwd_fops = {
 663         .owner =        THIS_MODULE,
 664         .llseek =       no_llseek,
 665         .write =        pcipcwd_write,
 666         .unlocked_ioctl = pcipcwd_ioctl,
 667         .open =         pcipcwd_open,
 668         .release =      pcipcwd_release,
 669 };
 670
 671 static struct miscdevice pcipcwd_miscdev = {
 672         .minor =        WATCHDOG_MINOR,
 673         .name =         "watchdog",
 674         .fops =         &pcipcwd_fops,
 675 };
 676
 677 static const struct file_operations pcipcwd_temp_fops = {
 678         .owner =        THIS_MODULE,
 679         .llseek =       no_llseek,
 680         .read =         pcipcwd_temp_read,
 681         .open =         pcipcwd_temp_open,
 682         .release =      pcipcwd_temp_release,
 683 };
 684
 685 static struct miscdevice pcipcwd_temp_miscdev = {
 686         .minor =        TEMP_MINOR,
 687         .name =         "temperature",
 688         .fops =         &pcipcwd_temp_fops,
 689 };
 690
 691 static struct notifier_block pcipcwd_notifier = {
 692         .notifier_call =        pcipcwd_notify_sys,
 693 };
 694
 695 /*
 696  *      Init & exit routines
 697  */
 698
 699 static int __devinit pcipcwd_card_init(struct pci_dev *pdev,
 700                 const struct pci_device_id *ent)
 701 {
 702         int ret = -EIO;
 703
 704         cards_found++;
 705         if (cards_found == 1)
 706                 printk(KERN_INFO PFX DRIVER_VERSION);
 707
 708         if (cards_found > 1) {
 709                 printk(KERN_ERR PFX "This driver only supports 1 device\n");
 710                 return -ENODEV;
 711         }
 712
 713         if (pci_enable_device(pdev)) {
 714                 printk(KERN_ERR PFX "Not possible to enable PCI Device\n");
 715                 return -ENODEV;
 716         }
 717
 718         if (pci_resource_start(pdev, 0) == 0x0000) {
 719                 printk(KERN_ERR PFX "No I/O-Address for card detected\n");
 720                 ret = -ENODEV;
 721                 goto err_out_disable_device;
 722         }
 723
 724         pcipcwd_private.pdev = pdev;
 725         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 726
 727         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 728                 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n",
 729                         (int) pcipcwd_private.io_addr);
 730                 ret = -EIO;
 731                 goto err_out_disable_device;
 732         }
 733
 734         /* get the boot_status */
 735         pcipcwd_get_status(&pcipcwd_private.boot_status);
 736
 737         /* clear the "card caused reboot" flag */
 738         pcipcwd_clear_status();
 739
 740         /* disable card */
 741         pcipcwd_stop();
 742
 743         /* Check whether or not the card supports the temperature device */
 744         pcipcwd_check_temperature_support();
 745
 746         /* Show info about the card itself */
 747         pcipcwd_show_card_info();
 748
 749         /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
 750         if (heartbeat == 0)
 751                 heartbeat =
 752                         heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
 753
 754         /* Check that the heartbeat value is within it's range ;
 755          * if not reset to the default */
 756         if (pcipcwd_set_heartbeat(heartbeat)) {
 757                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 758                 printk(KERN_INFO PFX
 759                         "heartbeat value must be 0<heartbeat<65536, using %d\n",
 760                         WATCHDOG_HEARTBEAT);
 761         }
 762
 763         ret = register_reboot_notifier(&pcipcwd_notifier);
 764         if (ret != 0) {
 765                 printk(KERN_ERR PFX
 766                         "cannot register reboot notifier (err=%d)\n", ret);
 767                 goto err_out_release_region;
 768         }
 769
 770         if (pcipcwd_private.supports_temp) {
 771                 ret = misc_register(&pcipcwd_temp_miscdev);
 772                 if (ret != 0) {
 773                         printk(KERN_ERR PFX "cannot register miscdev on "
 774                                 "minor=%d (err=%d)\n", TEMP_MINOR, ret);
 775                         goto err_out_unregister_reboot;
 776                 }
 777         }
 778
 779         ret = misc_register(&pcipcwd_miscdev);
 780         if (ret != 0) {
 781                 printk(KERN_ERR PFX
 782                         "cannot register miscdev on minor=%d (err=%d)\n",
 783                         WATCHDOG_MINOR, ret);
 784                 goto err_out_misc_deregister;
 785         }
 786
 787         printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n",
 788                 heartbeat, nowayout);
 789
 790         return 0;
 791
 792 err_out_misc_deregister:
 793         if (pcipcwd_private.supports_temp)
 794                 misc_deregister(&pcipcwd_temp_miscdev);
 795 err_out_unregister_reboot:
 796         unregister_reboot_notifier(&pcipcwd_notifier);
 797 err_out_release_region:
 798         pci_release_regions(pdev);
 799 err_out_disable_device:
 800         pci_disable_device(pdev);
 801         return ret;
 802 }
 803
 804 static void __devexit pcipcwd_card_exit(struct pci_dev *pdev)
 805 {
 806         /* Stop the timer before we leave */
 807         if (!nowayout)
 808                 pcipcwd_stop();
 809
 810         /* Deregister */
 811         misc_deregister(&pcipcwd_miscdev);
 812         if (pcipcwd_private.supports_temp)
 813                 misc_deregister(&pcipcwd_temp_miscdev);
 814         unregister_reboot_notifier(&pcipcwd_notifier);
 815         pci_release_regions(pdev);
 816         pci_disable_device(pdev);
 817         cards_found--;
 818 }
 819
 820 static struct pci_device_id pcipcwd_pci_tbl[] = {
 821         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 822                 PCI_ANY_ID, PCI_ANY_ID, },
 823         { 0 },                  /* End of list */
 824 };
 825 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 826
 827 static struct pci_driver pcipcwd_driver = {
 828         .name           = WATCHDOG_NAME,
 829         .id_table       = pcipcwd_pci_tbl,
 830         .probe          = pcipcwd_card_init,
 831         .remove         = __devexit_p(pcipcwd_card_exit),
 832 };
 833
 834 static int __init pcipcwd_init_module(void)
 835 {
 836         spin_lock_init(&pcipcwd_private.io_lock);
 837
 838         return pci_register_driver(&pcipcwd_driver);
 839 }
 840
 841 static void __exit pcipcwd_cleanup_module(void)
 842 {
 843         pci_unregister_driver(&pcipcwd_driver);
 844
 845         printk(KERN_INFO PFX "Watchdog Module Unloaded.\n");
 846 }
 847
 848 module_init(pcipcwd_init_module);
 849 module_exit(pcipcwd_cleanup_module);
 850
 851 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 852 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 853 MODULE_LICENSE("GPL");
 854 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
 855 MODULE_ALIAS_MISCDEV(TEMP_MINOR);