drivers/watchdog/pcwd

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This source file includes following definitions.
send_command
pcipcwd_check_temperature_support
pcipcwd_get_option_switches
pcipcwd_show_card_info
pcipcwd_start
pcipcwd_stop
pcipcwd_keepalive
pcipcwd_set_heartbeat
pcipcwd_get_status
pcipcwd_clear_status
pcipcwd_get_temperature
pcipcwd_get_timeleft
pcipcwd_write
pcipcwd_ioctl
pcipcwd_open
pcipcwd_release
pcipcwd_temp_read
pcipcwd_temp_open
pcipcwd_temp_release
pcipcwd_notify_sys
pcipcwd_card_init
pcipcwd_card_exit
   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *      Berkshire PCI-PC Watchdog Card Driver
   4  *
   5  *      (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>.
   6  *
   7  *      Based on source code of the following authors:
   8  *        Ken Hollis <kenji@bitgate.com>,
   9  *        Lindsay Harris <lindsay@bluegum.com>,
  10  *        Alan Cox <alan@lxorguk.ukuu.org.uk>,
  11  *        Matt Domsch <Matt_Domsch@dell.com>,
  12  *        Rob Radez <rob@osinvestor.com>
  13  *
  14  *      Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor
  15  *      provide warranty for any of this software. This material is
  16  *      provided "AS-IS" and at no charge.
  17  */
  18 
  19 /*
  20  *      A bells and whistles driver is available from:
  21  *      http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/
  22  *
  23  *      More info available at
  24  *      http://www.berkprod.com/ or http://www.pcwatchdog.com/
  25  */
  26 
  27 /*
  28  *      Includes, defines, variables, module parameters, ...
  29  */
  30 
  31 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  32 
  33 #include <linux/module.h>       /* For module specific items */
  34 #include <linux/moduleparam.h>  /* For new moduleparam's */
  35 #include <linux/types.h>        /* For standard types (like size_t) */
  36 #include <linux/errno.h>        /* For the -ENODEV/... values */
  37 #include <linux/kernel.h>       /* For printk/panic/... */
  38 #include <linux/delay.h>        /* For mdelay function */
  39 #include <linux/miscdevice.h>   /* For struct miscdevice */
  40 #include <linux/watchdog.h>     /* For the watchdog specific items */
  41 #include <linux/notifier.h>     /* For notifier support */
  42 #include <linux/reboot.h>       /* For reboot_notifier stuff */
  43 #include <linux/init.h>         /* For __init/__exit/... */
  44 #include <linux/fs.h>           /* For file operations */
  45 #include <linux/pci.h>          /* For pci functions */
  46 #include <linux/ioport.h>       /* For io-port access */
  47 #include <linux/spinlock.h>     /* For spin_lock/spin_unlock/... */
  48 #include <linux/uaccess.h>      /* For copy_to_user/put_user/... */
  49 #include <linux/io.h>           /* For inb/outb/... */
  50 
  51 /* Module and version information */
  52 #define WATCHDOG_VERSION "1.03"
  53 #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog"
  54 #define WATCHDOG_NAME "pcwd_pci"
  55 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION
  56 
  57 /* Stuff for the PCI ID's  */
  58 #ifndef PCI_VENDOR_ID_QUICKLOGIC
  59 #define PCI_VENDOR_ID_QUICKLOGIC    0x11e3
  60 #endif
  61 
  62 #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD
  63 #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030
  64 #endif
  65 
  66 /*
  67  * These are the defines that describe the control status bits for the
  68  * PCI-PC Watchdog card.
  69  */
  70 /* Port 1 : Control Status #1 */
  71 #define WD_PCI_WTRP             0x01    /* Watchdog Trip status */
  72 #define WD_PCI_HRBT             0x02    /* Watchdog Heartbeat */
  73 #define WD_PCI_TTRP             0x04    /* Temperature Trip status */
  74 #define WD_PCI_RL2A             0x08    /* Relay 2 Active */
  75 #define WD_PCI_RL1A             0x10    /* Relay 1 Active */
  76 #define WD_PCI_R2DS             0x40    /* Relay 2 Disable Temperature-trip /
  77                                                                         reset */
  78 #define WD_PCI_RLY2             0x80    /* Activate Relay 2 on the board */
  79 /* Port 2 : Control Status #2 */
  80 #define WD_PCI_WDIS             0x10    /* Watchdog Disable */
  81 #define WD_PCI_ENTP             0x20    /* Enable Temperature Trip Reset */
  82 #define WD_PCI_WRSP             0x40    /* Watchdog wrote response */
  83 #define WD_PCI_PCMD             0x80    /* PC has sent command */
  84 
  85 /* according to documentation max. time to process a command for the pci
  86  * watchdog card is 100 ms, so we give it 150 ms to do it's job */
  87 #define PCI_COMMAND_TIMEOUT     150
  88 
  89 /* Watchdog's internal commands */
  90 #define CMD_GET_STATUS                          0x04
  91 #define CMD_GET_FIRMWARE_VERSION                0x08
  92 #define CMD_READ_WATCHDOG_TIMEOUT               0x18
  93 #define CMD_WRITE_WATCHDOG_TIMEOUT              0x19
  94 #define CMD_GET_CLEAR_RESET_COUNT               0x84
  95 
  96 /* Watchdog's Dip Switch heartbeat values */
  97 static const int heartbeat_tbl[] = {
  98         5,      /* OFF-OFF-OFF  =  5 Sec  */
  99         10,     /* OFF-OFF-ON   = 10 Sec  */
 100         30,     /* OFF-ON-OFF   = 30 Sec  */
 101         60,     /* OFF-ON-ON    =  1 Min  */
 102         300,    /* ON-OFF-OFF   =  5 Min  */
 103         600,    /* ON-OFF-ON    = 10 Min  */
 104         1800,   /* ON-ON-OFF    = 30 Min  */
 105         3600,   /* ON-ON-ON     =  1 hour */
 106 };
 107 
 108 /* We can only use 1 card due to the /dev/watchdog restriction */
 109 static int cards_found;
 110 
 111 /* internal variables */
 112 static int temp_panic;
 113 static unsigned long is_active;
 114 static char expect_release;
 115 /* this is private data for each PCI-PC watchdog card */
 116 static struct {
 117         /* Wether or not the card has a temperature device */
 118         int supports_temp;
 119         /* The card's boot status */
 120         int boot_status;
 121         /* The cards I/O address */
 122         unsigned long io_addr;
 123         /* the lock for io operations */
 124         spinlock_t io_lock;
 125         /* the PCI-device */
 126         struct pci_dev *pdev;
 127 } pcipcwd_private;
 128 
 129 /* module parameters */
 130 #define QUIET   0       /* Default */
 131 #define VERBOSE 1       /* Verbose */
 132 #define DEBUG   2       /* print fancy stuff too */
 133 static int debug = QUIET;
 134 module_param(debug, int, 0);
 135 MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)");
 136 
 137 #define WATCHDOG_HEARTBEAT 0    /* default heartbeat =
 138                                                 delay-time from dip-switches */
 139 static int heartbeat = WATCHDOG_HEARTBEAT;
 140 module_param(heartbeat, int, 0);
 141 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. "
 142         "(0<heartbeat<65536 or 0=delay-time from dip-switches, default="
 143                                 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
 144 
 145 static bool nowayout = WATCHDOG_NOWAYOUT;
 146 module_param(nowayout, bool, 0);
 147 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
 148                                         __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
 149 
 150 /*
 151  *      Internal functions
 152  */
 153 
 154 static int send_command(int cmd, int *msb, int *lsb)
 155 {
 156         int got_response, count;
 157 
 158         if (debug >= DEBUG)
 159                 pr_debug("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n",
 160                          cmd, *msb, *lsb);
 161 
 162         spin_lock(&pcipcwd_private.io_lock);
 163         /* If a command requires data it should be written first.
 164          * Data for commands with 8 bits of data should be written to port 4.
 165          * Commands with 16 bits of data, should be written as LSB to port 4
 166          * and MSB to port 5.
 167          * After the required data has been written then write the command to
 168          * port 6. */
 169         outb_p(*lsb, pcipcwd_private.io_addr + 4);
 170         outb_p(*msb, pcipcwd_private.io_addr + 5);
 171         outb_p(cmd, pcipcwd_private.io_addr + 6);
 172 
 173         /* wait till the pci card processed the command, signaled by
 174          * the WRSP bit in port 2 and give it a max. timeout of
 175          * PCI_COMMAND_TIMEOUT to process */
 176         got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 177         for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response);
 178                                                                 count++) {
 179                 mdelay(1);
 180                 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP;
 181         }
 182 
 183         if (debug >= DEBUG) {
 184                 if (got_response) {
 185                         pr_debug("time to process command was: %d ms\n",
 186                                  count);
 187                 } else {
 188                         pr_debug("card did not respond on command!\n");
 189                 }
 190         }
 191 
 192         if (got_response) {
 193                 /* read back response */
 194                 *lsb = inb_p(pcipcwd_private.io_addr + 4);
 195                 *msb = inb_p(pcipcwd_private.io_addr + 5);
 196 
 197                 /* clear WRSP bit */
 198                 inb_p(pcipcwd_private.io_addr + 6);
 199 
 200                 if (debug >= DEBUG)
 201                         pr_debug("received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n",
 202                                  cmd, *msb, *lsb);
 203         }
 204 
 205         spin_unlock(&pcipcwd_private.io_lock);
 206 
 207         return got_response;
 208 }
 209 
 210 static inline void pcipcwd_check_temperature_support(void)
 211 {
 212         if (inb_p(pcipcwd_private.io_addr) != 0xF0)
 213                 pcipcwd_private.supports_temp = 1;
 214 }
 215 
 216 static int pcipcwd_get_option_switches(void)
 217 {
 218         int option_switches;
 219 
 220         option_switches = inb_p(pcipcwd_private.io_addr + 3);
 221         return option_switches;
 222 }
 223 
 224 static void pcipcwd_show_card_info(void)
 225 {
 226         int got_fw_rev, fw_rev_major, fw_rev_minor;
 227         char fw_ver_str[20];            /* The cards firmware version */
 228         int option_switches;
 229 
 230         got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major,
 231                                                                 &fw_rev_minor);
 232         if (got_fw_rev)
 233                 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor);
 234         else
 235                 sprintf(fw_ver_str, "<card no answer>");
 236 
 237         /* Get switch settings */
 238         option_switches = pcipcwd_get_option_switches();
 239 
 240         pr_info("Found card at port 0x%04x (Firmware: %s) %s temp option\n",
 241                 (int) pcipcwd_private.io_addr, fw_ver_str,
 242                 (pcipcwd_private.supports_temp ? "with" : "without"));
 243 
 244         pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n",
 245                 option_switches,
 246                 ((option_switches & 0x10) ? "ON" : "OFF"),
 247                 ((option_switches & 0x08) ? "ON" : "OFF"));
 248 
 249         if (pcipcwd_private.boot_status & WDIOF_CARDRESET)
 250                 pr_info("Previous reset was caused by the Watchdog card\n");
 251 
 252         if (pcipcwd_private.boot_status & WDIOF_OVERHEAT)
 253                 pr_info("Card sensed a CPU Overheat\n");
 254 
 255         if (pcipcwd_private.boot_status == 0)
 256                 pr_info("No previous trip detected - Cold boot or reset\n");
 257 }
 258 
 259 static int pcipcwd_start(void)
 260 {
 261         int stat_reg;
 262 
 263         spin_lock(&pcipcwd_private.io_lock);
 264         outb_p(0x00, pcipcwd_private.io_addr + 3);
 265         udelay(1000);
 266 
 267         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 268         spin_unlock(&pcipcwd_private.io_lock);
 269 
 270         if (stat_reg & WD_PCI_WDIS) {
 271                 pr_err("Card timer not enabled\n");
 272                 return -1;
 273         }
 274 
 275         if (debug >= VERBOSE)
 276                 pr_debug("Watchdog started\n");
 277 
 278         return 0;
 279 }
 280 
 281 static int pcipcwd_stop(void)
 282 {
 283         int stat_reg;
 284 
 285         spin_lock(&pcipcwd_private.io_lock);
 286         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 287         udelay(1000);
 288 
 289         outb_p(0xA5, pcipcwd_private.io_addr + 3);
 290         udelay(1000);
 291 
 292         stat_reg = inb_p(pcipcwd_private.io_addr + 2);
 293         spin_unlock(&pcipcwd_private.io_lock);
 294 
 295         if (!(stat_reg & WD_PCI_WDIS)) {
 296                 pr_err("Card did not acknowledge disable attempt\n");
 297                 return -1;
 298         }
 299 
 300         if (debug >= VERBOSE)
 301                 pr_debug("Watchdog stopped\n");
 302 
 303         return 0;
 304 }
 305 
 306 static int pcipcwd_keepalive(void)
 307 {
 308         /* Re-trigger watchdog by writing to port 0 */
 309         spin_lock(&pcipcwd_private.io_lock);
 310         outb_p(0x42, pcipcwd_private.io_addr);  /* send out any data */
 311         spin_unlock(&pcipcwd_private.io_lock);
 312 
 313         if (debug >= DEBUG)
 314                 pr_debug("Watchdog keepalive signal send\n");
 315 
 316         return 0;
 317 }
 318 
 319 static int pcipcwd_set_heartbeat(int t)
 320 {
 321         int t_msb = t / 256;
 322         int t_lsb = t % 256;
 323 
 324         if ((t < 0x0001) || (t > 0xFFFF))
 325                 return -EINVAL;
 326 
 327         /* Write new heartbeat to watchdog */
 328         send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb);
 329 
 330         heartbeat = t;
 331         if (debug >= VERBOSE)
 332                 pr_debug("New heartbeat: %d\n", heartbeat);
 333 
 334         return 0;
 335 }
 336 
 337 static int pcipcwd_get_status(int *status)
 338 {
 339         int control_status;
 340 
 341         *status = 0;
 342         control_status = inb_p(pcipcwd_private.io_addr + 1);
 343         if (control_status & WD_PCI_WTRP)
 344                 *status |= WDIOF_CARDRESET;
 345         if (control_status & WD_PCI_TTRP) {
 346                 *status |= WDIOF_OVERHEAT;
 347                 if (temp_panic)
 348                         panic(KBUILD_MODNAME ": Temperature overheat trip!\n");
 349         }
 350 
 351         if (debug >= DEBUG)
 352                 pr_debug("Control Status #1: 0x%02x\n", control_status);
 353 
 354         return 0;
 355 }
 356 
 357 static int pcipcwd_clear_status(void)
 358 {
 359         int control_status;
 360         int msb;
 361         int reset_counter;
 362 
 363         if (debug >= VERBOSE)
 364                 pr_info("clearing watchdog trip status & LED\n");
 365 
 366         control_status = inb_p(pcipcwd_private.io_addr + 1);
 367 
 368         if (debug >= DEBUG) {
 369                 pr_debug("status was: 0x%02x\n", control_status);
 370                 pr_debug("sending: 0x%02x\n",
 371                          (control_status & WD_PCI_R2DS) | WD_PCI_WTRP);
 372         }
 373 
 374         /* clear trip status & LED and keep mode of relay 2 */
 375         outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP,
 376                                                 pcipcwd_private.io_addr + 1);
 377 
 378         /* clear reset counter */
 379         msb = 0;
 380         reset_counter = 0xff;
 381         send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter);
 382 
 383         if (debug >= DEBUG) {
 384                 pr_debug("reset count was: 0x%02x\n", reset_counter);
 385         }
 386 
 387         return 0;
 388 }
 389 
 390 static int pcipcwd_get_temperature(int *temperature)
 391 {
 392         *temperature = 0;
 393         if (!pcipcwd_private.supports_temp)
 394                 return -ENODEV;
 395 
 396         spin_lock(&pcipcwd_private.io_lock);
 397         *temperature = inb_p(pcipcwd_private.io_addr);
 398         spin_unlock(&pcipcwd_private.io_lock);
 399 
 400         /*
 401          * Convert celsius to fahrenheit, since this was
 402          * the decided 'standard' for this return value.
 403          */
 404         *temperature = (*temperature * 9 / 5) + 32;
 405 
 406         if (debug >= DEBUG) {
 407                 pr_debug("temperature is: %d F\n", *temperature);
 408         }
 409 
 410         return 0;
 411 }
 412 
 413 static int pcipcwd_get_timeleft(int *time_left)
 414 {
 415         int msb;
 416         int lsb;
 417 
 418         /* Read the time that's left before rebooting */
 419         /* Note: if the board is not yet armed then we will read 0xFFFF */
 420         send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb);
 421 
 422         *time_left = (msb << 8) + lsb;
 423 
 424         if (debug >= VERBOSE)
 425                 pr_debug("Time left before next reboot: %d\n", *time_left);
 426 
 427         return 0;
 428 }
 429 
 430 /*
 431  *      /dev/watchdog handling
 432  */
 433 
 434 static ssize_t pcipcwd_write(struct file *file, const char __user *data,
 435                              size_t len, loff_t *ppos)
 436 {
 437         /* See if we got the magic character 'V' and reload the timer */
 438         if (len) {
 439                 if (!nowayout) {
 440                         size_t i;
 441 
 442                         /* note: just in case someone wrote the magic character
 443                          * five months ago... */
 444                         expect_release = 0;
 445 
 446                         /* scan to see whether or not we got the
 447                          * magic character */
 448                         for (i = 0; i != len; i++) {
 449                                 char c;
 450                                 if (get_user(c, data + i))
 451                                         return -EFAULT;
 452                                 if (c == 'V')
 453                                         expect_release = 42;
 454                         }
 455                 }
 456 
 457                 /* someone wrote to us, we should reload the timer */
 458                 pcipcwd_keepalive();
 459         }
 460         return len;
 461 }
 462 
 463 static long pcipcwd_ioctl(struct file *file, unsigned int cmd,
 464                                                 unsigned long arg)
 465 {
 466         void __user *argp = (void __user *)arg;
 467         int __user *p = argp;
 468         static const struct watchdog_info ident = {
 469                 .options =              WDIOF_OVERHEAT |
 470                                         WDIOF_CARDRESET |
 471                                         WDIOF_KEEPALIVEPING |
 472                                         WDIOF_SETTIMEOUT |
 473                                         WDIOF_MAGICCLOSE,
 474                 .firmware_version =     1,
 475                 .identity =             WATCHDOG_DRIVER_NAME,
 476         };
 477 
 478         switch (cmd) {
 479         case WDIOC_GETSUPPORT:
 480                 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
 481 
 482         case WDIOC_GETSTATUS:
 483         {
 484                 int status;
 485                 pcipcwd_get_status(&status);
 486                 return put_user(status, p);
 487         }
 488 
 489         case WDIOC_GETBOOTSTATUS:
 490                 return put_user(pcipcwd_private.boot_status, p);
 491 
 492         case WDIOC_GETTEMP:
 493         {
 494                 int temperature;
 495 
 496                 if (pcipcwd_get_temperature(&temperature))
 497                         return -EFAULT;
 498 
 499                 return put_user(temperature, p);
 500         }
 501 
 502         case WDIOC_SETOPTIONS:
 503         {
 504                 int new_options, retval = -EINVAL;
 505 
 506                 if (get_user(new_options, p))
 507                         return -EFAULT;
 508 
 509                 if (new_options & WDIOS_DISABLECARD) {
 510                         if (pcipcwd_stop())
 511                                 return -EIO;
 512                         retval = 0;
 513                 }
 514 
 515                 if (new_options & WDIOS_ENABLECARD) {
 516                         if (pcipcwd_start())
 517                                 return -EIO;
 518                         retval = 0;
 519                 }
 520 
 521                 if (new_options & WDIOS_TEMPPANIC) {
 522                         temp_panic = 1;
 523                         retval = 0;
 524                 }
 525 
 526                 return retval;
 527         }
 528 
 529         case WDIOC_KEEPALIVE:
 530                 pcipcwd_keepalive();
 531                 return 0;
 532 
 533         case WDIOC_SETTIMEOUT:
 534         {
 535                 int new_heartbeat;
 536 
 537                 if (get_user(new_heartbeat, p))
 538                         return -EFAULT;
 539 
 540                 if (pcipcwd_set_heartbeat(new_heartbeat))
 541                         return -EINVAL;
 542 
 543                 pcipcwd_keepalive();
 544         }
 545                 /* fall through */
 546 
 547         case WDIOC_GETTIMEOUT:
 548                 return put_user(heartbeat, p);
 549 
 550         case WDIOC_GETTIMELEFT:
 551         {
 552                 int time_left;
 553 
 554                 if (pcipcwd_get_timeleft(&time_left))
 555                         return -EFAULT;
 556 
 557                 return put_user(time_left, p);
 558         }
 559 
 560         default:
 561                 return -ENOTTY;
 562         }
 563 }
 564 
 565 static int pcipcwd_open(struct inode *inode, struct file *file)
 566 {
 567         /* /dev/watchdog can only be opened once */
 568         if (test_and_set_bit(0, &is_active)) {
 569                 if (debug >= VERBOSE)
 570                         pr_err("Attempt to open already opened device\n");
 571                 return -EBUSY;
 572         }
 573 
 574         /* Activate */
 575         pcipcwd_start();
 576         pcipcwd_keepalive();
 577         return stream_open(inode, file);
 578 }
 579 
 580 static int pcipcwd_release(struct inode *inode, struct file *file)
 581 {
 582         /*
 583          *      Shut off the timer.
 584          */
 585         if (expect_release == 42) {
 586                 pcipcwd_stop();
 587         } else {
 588                 pr_crit("Unexpected close, not stopping watchdog!\n");
 589                 pcipcwd_keepalive();
 590         }
 591         expect_release = 0;
 592         clear_bit(0, &is_active);
 593         return 0;
 594 }
 595 
 596 /*
 597  *      /dev/temperature handling
 598  */
 599 
 600 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data,
 601                                 size_t len, loff_t *ppos)
 602 {
 603         int temperature;
 604 
 605         if (pcipcwd_get_temperature(&temperature))
 606                 return -EFAULT;
 607 
 608         if (copy_to_user(data, &temperature, 1))
 609                 return -EFAULT;
 610 
 611         return 1;
 612 }
 613 
 614 static int pcipcwd_temp_open(struct inode *inode, struct file *file)
 615 {
 616         if (!pcipcwd_private.supports_temp)
 617                 return -ENODEV;
 618 
 619         return stream_open(inode, file);
 620 }
 621 
 622 static int pcipcwd_temp_release(struct inode *inode, struct file *file)
 623 {
 624         return 0;
 625 }
 626 
 627 /*
 628  *      Notify system
 629  */
 630 
 631 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code,
 632                                                                 void *unused)
 633 {
 634         if (code == SYS_DOWN || code == SYS_HALT)
 635                 pcipcwd_stop(); /* Turn the WDT off */
 636 
 637         return NOTIFY_DONE;
 638 }
 639 
 640 /*
 641  *      Kernel Interfaces
 642  */
 643 
 644 static const struct file_operations pcipcwd_fops = {
 645         .owner =        THIS_MODULE,
 646         .llseek =       no_llseek,
 647         .write =        pcipcwd_write,
 648         .unlocked_ioctl = pcipcwd_ioctl,
 649         .open =         pcipcwd_open,
 650         .release =      pcipcwd_release,
 651 };
 652 
 653 static struct miscdevice pcipcwd_miscdev = {
 654         .minor =        WATCHDOG_MINOR,
 655         .name =         "watchdog",
 656         .fops =         &pcipcwd_fops,
 657 };
 658 
 659 static const struct file_operations pcipcwd_temp_fops = {
 660         .owner =        THIS_MODULE,
 661         .llseek =       no_llseek,
 662         .read =         pcipcwd_temp_read,
 663         .open =         pcipcwd_temp_open,
 664         .release =      pcipcwd_temp_release,
 665 };
 666 
 667 static struct miscdevice pcipcwd_temp_miscdev = {
 668         .minor =        TEMP_MINOR,
 669         .name =         "temperature",
 670         .fops =         &pcipcwd_temp_fops,
 671 };
 672 
 673 static struct notifier_block pcipcwd_notifier = {
 674         .notifier_call =        pcipcwd_notify_sys,
 675 };
 676 
 677 /*
 678  *      Init & exit routines
 679  */
 680 
 681 static int pcipcwd_card_init(struct pci_dev *pdev,
 682                 const struct pci_device_id *ent)
 683 {
 684         int ret = -EIO;
 685 
 686         cards_found++;
 687         if (cards_found == 1)
 688                 pr_info("%s\n", DRIVER_VERSION);
 689 
 690         if (cards_found > 1) {
 691                 pr_err("This driver only supports 1 device\n");
 692                 return -ENODEV;
 693         }
 694 
 695         if (pci_enable_device(pdev)) {
 696                 pr_err("Not possible to enable PCI Device\n");
 697                 return -ENODEV;
 698         }
 699 
 700         if (pci_resource_start(pdev, 0) == 0x0000) {
 701                 pr_err("No I/O-Address for card detected\n");
 702                 ret = -ENODEV;
 703                 goto err_out_disable_device;
 704         }
 705 
 706         spin_lock_init(&pcipcwd_private.io_lock);
 707         pcipcwd_private.pdev = pdev;
 708         pcipcwd_private.io_addr = pci_resource_start(pdev, 0);
 709 
 710         if (pci_request_regions(pdev, WATCHDOG_NAME)) {
 711                 pr_err("I/O address 0x%04x already in use\n",
 712                        (int) pcipcwd_private.io_addr);
 713                 ret = -EIO;
 714                 goto err_out_disable_device;
 715         }
 716 
 717         /* get the boot_status */
 718         pcipcwd_get_status(&pcipcwd_private.boot_status);
 719 
 720         /* clear the "card caused reboot" flag */
 721         pcipcwd_clear_status();
 722 
 723         /* disable card */
 724         pcipcwd_stop();
 725 
 726         /* Check whether or not the card supports the temperature device */
 727         pcipcwd_check_temperature_support();
 728 
 729         /* Show info about the card itself */
 730         pcipcwd_show_card_info();
 731 
 732         /* If heartbeat = 0 then we use the heartbeat from the dip-switches */
 733         if (heartbeat == 0)
 734                 heartbeat =
 735                         heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)];
 736 
 737         /* Check that the heartbeat value is within it's range ;
 738          * if not reset to the default */
 739         if (pcipcwd_set_heartbeat(heartbeat)) {
 740                 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT);
 741                 pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n",
 742                         WATCHDOG_HEARTBEAT);
 743         }
 744 
 745         ret = register_reboot_notifier(&pcipcwd_notifier);
 746         if (ret != 0) {
 747                 pr_err("cannot register reboot notifier (err=%d)\n", ret);
 748                 goto err_out_release_region;
 749         }
 750 
 751         if (pcipcwd_private.supports_temp) {
 752                 ret = misc_register(&pcipcwd_temp_miscdev);
 753                 if (ret != 0) {
 754                         pr_err("cannot register miscdev on minor=%d (err=%d)\n",
 755                                TEMP_MINOR, ret);
 756                         goto err_out_unregister_reboot;
 757                 }
 758         }
 759 
 760         ret = misc_register(&pcipcwd_miscdev);
 761         if (ret != 0) {
 762                 pr_err("cannot register miscdev on minor=%d (err=%d)\n",
 763                        WATCHDOG_MINOR, ret);
 764                 goto err_out_misc_deregister;
 765         }
 766 
 767         pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n",
 768                 heartbeat, nowayout);
 769 
 770         return 0;
 771 
 772 err_out_misc_deregister:
 773         if (pcipcwd_private.supports_temp)
 774                 misc_deregister(&pcipcwd_temp_miscdev);
 775 err_out_unregister_reboot:
 776         unregister_reboot_notifier(&pcipcwd_notifier);
 777 err_out_release_region:
 778         pci_release_regions(pdev);
 779 err_out_disable_device:
 780         pci_disable_device(pdev);
 781         return ret;
 782 }
 783 
 784 static void pcipcwd_card_exit(struct pci_dev *pdev)
 785 {
 786         /* Stop the timer before we leave */
 787         if (!nowayout)
 788                 pcipcwd_stop();
 789 
 790         /* Deregister */
 791         misc_deregister(&pcipcwd_miscdev);
 792         if (pcipcwd_private.supports_temp)
 793                 misc_deregister(&pcipcwd_temp_miscdev);
 794         unregister_reboot_notifier(&pcipcwd_notifier);
 795         pci_release_regions(pdev);
 796         pci_disable_device(pdev);
 797         cards_found--;
 798 }
 799 
 800 static const struct pci_device_id pcipcwd_pci_tbl[] = {
 801         { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD,
 802                 PCI_ANY_ID, PCI_ANY_ID, },
 803         { 0 },                  /* End of list */
 804 };
 805 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl);
 806 
 807 static struct pci_driver pcipcwd_driver = {
 808         .name           = WATCHDOG_NAME,
 809         .id_table       = pcipcwd_pci_tbl,
 810         .probe          = pcipcwd_card_init,
 811         .remove         = pcipcwd_card_exit,
 812 };
 813 
 814 module_pci_driver(pcipcwd_driver);
 815 
 816 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>");
 817 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver");
 818 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/watchdog/pcwd_pci.c

DEFINITIONS
