1 /* 2 * Berkshire PCI-PC Watchdog Card Driver 3 * 4 * (c) Copyright 2003-2007 Wim Van Sebroeck <wim@iguana.be>. 5 * 6 * Based on source code of the following authors: 7 * Ken Hollis <kenji@bitgate.com>, 8 * Lindsay Harris <lindsay@bluegum.com>, 9 * Alan Cox <alan@lxorguk.ukuu.org.uk>, 10 * Matt Domsch <Matt_Domsch@dell.com>, 11 * Rob Radez <rob@osinvestor.com> 12 * 13 * This program is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU General Public License 15 * as published by the Free Software Foundation; either version 16 * 2 of the License, or (at your option) any later version. 17 * 18 * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor 19 * provide warranty for any of this software. This material is 20 * provided "AS-IS" and at no charge. 21 */ 22 23 /* 24 * A bells and whistles driver is available from: 25 * http://www.kernel.org/pub/linux/kernel/people/wim/pcwd/pcwd_pci/ 26 * 27 * More info available at 28 * http://www.berkprod.com/ or http://www.pcwatchdog.com/ 29 */ 30 31 /* 32 * Includes, defines, variables, module parameters, ... 33 */ 34 35 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 36 37 #include <linux/module.h> /* For module specific items */ 38 #include <linux/moduleparam.h> /* For new moduleparam's */ 39 #include <linux/types.h> /* For standard types (like size_t) */ 40 #include <linux/errno.h> /* For the -ENODEV/... values */ 41 #include <linux/kernel.h> /* For printk/panic/... */ 42 #include <linux/delay.h> /* For mdelay function */ 43 #include <linux/miscdevice.h> /* For struct miscdevice */ 44 #include <linux/watchdog.h> /* For the watchdog specific items */ 45 #include <linux/notifier.h> /* For notifier support */ 46 #include <linux/reboot.h> /* For reboot_notifier stuff */ 47 #include <linux/init.h> /* For __init/__exit/... */ 48 #include <linux/fs.h> /* For file operations */ 49 #include <linux/pci.h> /* For pci functions */ 50 #include <linux/ioport.h> /* For io-port access */ 51 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ 52 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ 53 #include <linux/io.h> /* For inb/outb/... */ 54 55 /* Module and version information */ 56 #define WATCHDOG_VERSION "1.03" 57 #define WATCHDOG_DRIVER_NAME "PCI-PC Watchdog" 58 #define WATCHDOG_NAME "pcwd_pci" 59 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION 60 61 /* Stuff for the PCI ID's */ 62 #ifndef PCI_VENDOR_ID_QUICKLOGIC 63 #define PCI_VENDOR_ID_QUICKLOGIC 0x11e3 64 #endif 65 66 #ifndef PCI_DEVICE_ID_WATCHDOG_PCIPCWD 67 #define PCI_DEVICE_ID_WATCHDOG_PCIPCWD 0x5030 68 #endif 69 70 /* 71 * These are the defines that describe the control status bits for the 72 * PCI-PC Watchdog card. 73 */ 74 /* Port 1 : Control Status #1 */ 75 #define WD_PCI_WTRP 0x01 /* Watchdog Trip status */ 76 #define WD_PCI_HRBT 0x02 /* Watchdog Heartbeat */ 77 #define WD_PCI_TTRP 0x04 /* Temperature Trip status */ 78 #define WD_PCI_RL2A 0x08 /* Relay 2 Active */ 79 #define WD_PCI_RL1A 0x10 /* Relay 1 Active */ 80 #define WD_PCI_R2DS 0x40 /* Relay 2 Disable Temperature-trip / 81 reset */ 82 #define WD_PCI_RLY2 0x80 /* Activate Relay 2 on the board */ 83 /* Port 2 : Control Status #2 */ 84 #define WD_PCI_WDIS 0x10 /* Watchdog Disable */ 85 #define WD_PCI_ENTP 0x20 /* Enable Temperature Trip Reset */ 86 #define WD_PCI_WRSP 0x40 /* Watchdog wrote response */ 87 #define WD_PCI_PCMD 0x80 /* PC has sent command */ 88 89 /* according to documentation max. time to process a command for the pci 90 * watchdog card is 100 ms, so we give it 150 ms to do it's job */ 91 #define PCI_COMMAND_TIMEOUT 150 92 93 /* Watchdog's internal commands */ 94 #define CMD_GET_STATUS 0x04 95 #define CMD_GET_FIRMWARE_VERSION 0x08 96 #define CMD_READ_WATCHDOG_TIMEOUT 0x18 97 #define CMD_WRITE_WATCHDOG_TIMEOUT 0x19 98 #define CMD_GET_CLEAR_RESET_COUNT 0x84 99 100 /* Watchdog's Dip Switch heartbeat values */ 101 static const int heartbeat_tbl[] = { 102 5, /* OFF-OFF-OFF = 5 Sec */ 103 10, /* OFF-OFF-ON = 10 Sec */ 104 30, /* OFF-ON-OFF = 30 Sec */ 105 60, /* OFF-ON-ON = 1 Min */ 106 300, /* ON-OFF-OFF = 5 Min */ 107 600, /* ON-OFF-ON = 10 Min */ 108 1800, /* ON-ON-OFF = 30 Min */ 109 3600, /* ON-ON-ON = 1 hour */ 110 }; 111 112 /* We can only use 1 card due to the /dev/watchdog restriction */ 113 static int cards_found; 114 115 /* internal variables */ 116 static int temp_panic; 117 static unsigned long is_active; 118 static char expect_release; 119 /* this is private data for each PCI-PC watchdog card */ 120 static struct { 121 /* Wether or not the card has a temperature device */ 122 int supports_temp; 123 /* The card's boot status */ 124 int boot_status; 125 /* The cards I/O address */ 126 unsigned long io_addr; 127 /* the lock for io operations */ 128 spinlock_t io_lock; 129 /* the PCI-device */ 130 struct pci_dev *pdev; 131 } pcipcwd_private; 132 133 /* module parameters */ 134 #define QUIET 0 /* Default */ 135 #define VERBOSE 1 /* Verbose */ 136 #define DEBUG 2 /* print fancy stuff too */ 137 static int debug = QUIET; 138 module_param(debug, int, 0); 139 MODULE_PARM_DESC(debug, "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); 140 141 #define WATCHDOG_HEARTBEAT 0 /* default heartbeat = 142 delay-time from dip-switches */ 143 static int heartbeat = WATCHDOG_HEARTBEAT; 144 module_param(heartbeat, int, 0); 145 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " 146 "(0<heartbeat<65536 or 0=delay-time from dip-switches, default=" 147 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); 148 149 static bool nowayout = WATCHDOG_NOWAYOUT; 150 module_param(nowayout, bool, 0); 151 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" 152 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 153 154 /* 155 * Internal functions 156 */ 157 158 static int send_command(int cmd, int *msb, int *lsb) 159 { 160 int got_response, count; 161 162 if (debug >= DEBUG) 163 pr_debug("sending following data cmd=0x%02x msb=0x%02x lsb=0x%02x\n", 164 cmd, *msb, *lsb); 165 166 spin_lock(&pcipcwd_private.io_lock); 167 /* If a command requires data it should be written first. 168 * Data for commands with 8 bits of data should be written to port 4. 169 * Commands with 16 bits of data, should be written as LSB to port 4 170 * and MSB to port 5. 171 * After the required data has been written then write the command to 172 * port 6. */ 173 outb_p(*lsb, pcipcwd_private.io_addr + 4); 174 outb_p(*msb, pcipcwd_private.io_addr + 5); 175 outb_p(cmd, pcipcwd_private.io_addr + 6); 176 177 /* wait till the pci card processed the command, signaled by 178 * the WRSP bit in port 2 and give it a max. timeout of 179 * PCI_COMMAND_TIMEOUT to process */ 180 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; 181 for (count = 0; (count < PCI_COMMAND_TIMEOUT) && (!got_response); 182 count++) { 183 mdelay(1); 184 got_response = inb_p(pcipcwd_private.io_addr + 2) & WD_PCI_WRSP; 185 } 186 187 if (debug >= DEBUG) { 188 if (got_response) { 189 pr_debug("time to process command was: %d ms\n", 190 count); 191 } else { 192 pr_debug("card did not respond on command!\n"); 193 } 194 } 195 196 if (got_response) { 197 /* read back response */ 198 *lsb = inb_p(pcipcwd_private.io_addr + 4); 199 *msb = inb_p(pcipcwd_private.io_addr + 5); 200 201 /* clear WRSP bit */ 202 inb_p(pcipcwd_private.io_addr + 6); 203 204 if (debug >= DEBUG) 205 pr_debug("received following data for cmd=0x%02x: msb=0x%02x lsb=0x%02x\n", 206 cmd, *msb, *lsb); 207 } 208 209 spin_unlock(&pcipcwd_private.io_lock); 210 211 return got_response; 212 } 213 214 static inline void pcipcwd_check_temperature_support(void) 215 { 216 if (inb_p(pcipcwd_private.io_addr) != 0xF0) 217 pcipcwd_private.supports_temp = 1; 218 } 219 220 static int pcipcwd_get_option_switches(void) 221 { 222 int option_switches; 223 224 option_switches = inb_p(pcipcwd_private.io_addr + 3); 225 return option_switches; 226 } 227 228 static void pcipcwd_show_card_info(void) 229 { 230 int got_fw_rev, fw_rev_major, fw_rev_minor; 231 char fw_ver_str[20]; /* The cards firmware version */ 232 int option_switches; 233 234 got_fw_rev = send_command(CMD_GET_FIRMWARE_VERSION, &fw_rev_major, 235 &fw_rev_minor); 236 if (got_fw_rev) 237 sprintf(fw_ver_str, "%u.%02u", fw_rev_major, fw_rev_minor); 238 else 239 sprintf(fw_ver_str, "<card no answer>"); 240 241 /* Get switch settings */ 242 option_switches = pcipcwd_get_option_switches(); 243 244 pr_info("Found card at port 0x%04x (Firmware: %s) %s temp option\n", 245 (int) pcipcwd_private.io_addr, fw_ver_str, 246 (pcipcwd_private.supports_temp ? "with" : "without")); 247 248 pr_info("Option switches (0x%02x): Temperature Reset Enable=%s, Power On Delay=%s\n", 249 option_switches, 250 ((option_switches & 0x10) ? "ON" : "OFF"), 251 ((option_switches & 0x08) ? "ON" : "OFF")); 252 253 if (pcipcwd_private.boot_status & WDIOF_CARDRESET) 254 pr_info("Previous reset was caused by the Watchdog card\n"); 255 256 if (pcipcwd_private.boot_status & WDIOF_OVERHEAT) 257 pr_info("Card sensed a CPU Overheat\n"); 258 259 if (pcipcwd_private.boot_status == 0) 260 pr_info("No previous trip detected - Cold boot or reset\n"); 261 } 262 263 static int pcipcwd_start(void) 264 { 265 int stat_reg; 266 267 spin_lock(&pcipcwd_private.io_lock); 268 outb_p(0x00, pcipcwd_private.io_addr + 3); 269 udelay(1000); 270 271 stat_reg = inb_p(pcipcwd_private.io_addr + 2); 272 spin_unlock(&pcipcwd_private.io_lock); 273 274 if (stat_reg & WD_PCI_WDIS) { 275 pr_err("Card timer not enabled\n"); 276 return -1; 277 } 278 279 if (debug >= VERBOSE) 280 pr_debug("Watchdog started\n"); 281 282 return 0; 283 } 284 285 static int pcipcwd_stop(void) 286 { 287 int stat_reg; 288 289 spin_lock(&pcipcwd_private.io_lock); 290 outb_p(0xA5, pcipcwd_private.io_addr + 3); 291 udelay(1000); 292 293 outb_p(0xA5, pcipcwd_private.io_addr + 3); 294 udelay(1000); 295 296 stat_reg = inb_p(pcipcwd_private.io_addr + 2); 297 spin_unlock(&pcipcwd_private.io_lock); 298 299 if (!(stat_reg & WD_PCI_WDIS)) { 300 pr_err("Card did not acknowledge disable attempt\n"); 301 return -1; 302 } 303 304 if (debug >= VERBOSE) 305 pr_debug("Watchdog stopped\n"); 306 307 return 0; 308 } 309 310 static int pcipcwd_keepalive(void) 311 { 312 /* Re-trigger watchdog by writing to port 0 */ 313 spin_lock(&pcipcwd_private.io_lock); 314 outb_p(0x42, pcipcwd_private.io_addr); /* send out any data */ 315 spin_unlock(&pcipcwd_private.io_lock); 316 317 if (debug >= DEBUG) 318 pr_debug("Watchdog keepalive signal send\n"); 319 320 return 0; 321 } 322 323 static int pcipcwd_set_heartbeat(int t) 324 { 325 int t_msb = t / 256; 326 int t_lsb = t % 256; 327 328 if ((t < 0x0001) || (t > 0xFFFF)) 329 return -EINVAL; 330 331 /* Write new heartbeat to watchdog */ 332 send_command(CMD_WRITE_WATCHDOG_TIMEOUT, &t_msb, &t_lsb); 333 334 heartbeat = t; 335 if (debug >= VERBOSE) 336 pr_debug("New heartbeat: %d\n", heartbeat); 337 338 return 0; 339 } 340 341 static int pcipcwd_get_status(int *status) 342 { 343 int control_status; 344 345 *status = 0; 346 control_status = inb_p(pcipcwd_private.io_addr + 1); 347 if (control_status & WD_PCI_WTRP) 348 *status |= WDIOF_CARDRESET; 349 if (control_status & WD_PCI_TTRP) { 350 *status |= WDIOF_OVERHEAT; 351 if (temp_panic) 352 panic(KBUILD_MODNAME ": Temperature overheat trip!\n"); 353 } 354 355 if (debug >= DEBUG) 356 pr_debug("Control Status #1: 0x%02x\n", control_status); 357 358 return 0; 359 } 360 361 static int pcipcwd_clear_status(void) 362 { 363 int control_status; 364 int msb; 365 int reset_counter; 366 367 if (debug >= VERBOSE) 368 pr_info("clearing watchdog trip status & LED\n"); 369 370 control_status = inb_p(pcipcwd_private.io_addr + 1); 371 372 if (debug >= DEBUG) { 373 pr_debug("status was: 0x%02x\n", control_status); 374 pr_debug("sending: 0x%02x\n", 375 (control_status & WD_PCI_R2DS) | WD_PCI_WTRP); 376 } 377 378 /* clear trip status & LED and keep mode of relay 2 */ 379 outb_p((control_status & WD_PCI_R2DS) | WD_PCI_WTRP, 380 pcipcwd_private.io_addr + 1); 381 382 /* clear reset counter */ 383 msb = 0; 384 reset_counter = 0xff; 385 send_command(CMD_GET_CLEAR_RESET_COUNT, &msb, &reset_counter); 386 387 if (debug >= DEBUG) { 388 pr_debug("reset count was: 0x%02x\n", reset_counter); 389 } 390 391 return 0; 392 } 393 394 static int pcipcwd_get_temperature(int *temperature) 395 { 396 *temperature = 0; 397 if (!pcipcwd_private.supports_temp) 398 return -ENODEV; 399 400 spin_lock(&pcipcwd_private.io_lock); 401 *temperature = inb_p(pcipcwd_private.io_addr); 402 spin_unlock(&pcipcwd_private.io_lock); 403 404 /* 405 * Convert celsius to fahrenheit, since this was 406 * the decided 'standard' for this return value. 407 */ 408 *temperature = (*temperature * 9 / 5) + 32; 409 410 if (debug >= DEBUG) { 411 pr_debug("temperature is: %d F\n", *temperature); 412 } 413 414 return 0; 415 } 416 417 static int pcipcwd_get_timeleft(int *time_left) 418 { 419 int msb; 420 int lsb; 421 422 /* Read the time that's left before rebooting */ 423 /* Note: if the board is not yet armed then we will read 0xFFFF */ 424 send_command(CMD_READ_WATCHDOG_TIMEOUT, &msb, &lsb); 425 426 *time_left = (msb << 8) + lsb; 427 428 if (debug >= VERBOSE) 429 pr_debug("Time left before next reboot: %d\n", *time_left); 430 431 return 0; 432 } 433 434 /* 435 * /dev/watchdog handling 436 */ 437 438 static ssize_t pcipcwd_write(struct file *file, const char __user *data, 439 size_t len, loff_t *ppos) 440 { 441 /* See if we got the magic character 'V' and reload the timer */ 442 if (len) { 443 if (!nowayout) { 444 size_t i; 445 446 /* note: just in case someone wrote the magic character 447 * five months ago... */ 448 expect_release = 0; 449 450 /* scan to see whether or not we got the 451 * magic character */ 452 for (i = 0; i != len; i++) { 453 char c; 454 if (get_user(c, data + i)) 455 return -EFAULT; 456 if (c == 'V') 457 expect_release = 42; 458 } 459 } 460 461 /* someone wrote to us, we should reload the timer */ 462 pcipcwd_keepalive(); 463 } 464 return len; 465 } 466 467 static long pcipcwd_ioctl(struct file *file, unsigned int cmd, 468 unsigned long arg) 469 { 470 void __user *argp = (void __user *)arg; 471 int __user *p = argp; 472 static const struct watchdog_info ident = { 473 .options = WDIOF_OVERHEAT | 474 WDIOF_CARDRESET | 475 WDIOF_KEEPALIVEPING | 476 WDIOF_SETTIMEOUT | 477 WDIOF_MAGICCLOSE, 478 .firmware_version = 1, 479 .identity = WATCHDOG_DRIVER_NAME, 480 }; 481 482 switch (cmd) { 483 case WDIOC_GETSUPPORT: 484 return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0; 485 486 case WDIOC_GETSTATUS: 487 { 488 int status; 489 pcipcwd_get_status(&status); 490 return put_user(status, p); 491 } 492 493 case WDIOC_GETBOOTSTATUS: 494 return put_user(pcipcwd_private.boot_status, p); 495 496 case WDIOC_GETTEMP: 497 { 498 int temperature; 499 500 if (pcipcwd_get_temperature(&temperature)) 501 return -EFAULT; 502 503 return put_user(temperature, p); 504 } 505 506 case WDIOC_SETOPTIONS: 507 { 508 int new_options, retval = -EINVAL; 509 510 if (get_user(new_options, p)) 511 return -EFAULT; 512 513 if (new_options & WDIOS_DISABLECARD) { 514 if (pcipcwd_stop()) 515 return -EIO; 516 retval = 0; 517 } 518 519 if (new_options & WDIOS_ENABLECARD) { 520 if (pcipcwd_start()) 521 return -EIO; 522 retval = 0; 523 } 524 525 if (new_options & WDIOS_TEMPPANIC) { 526 temp_panic = 1; 527 retval = 0; 528 } 529 530 return retval; 531 } 532 533 case WDIOC_KEEPALIVE: 534 pcipcwd_keepalive(); 535 return 0; 536 537 case WDIOC_SETTIMEOUT: 538 { 539 int new_heartbeat; 540 541 if (get_user(new_heartbeat, p)) 542 return -EFAULT; 543 544 if (pcipcwd_set_heartbeat(new_heartbeat)) 545 return -EINVAL; 546 547 pcipcwd_keepalive(); 548 /* Fall */ 549 } 550 551 case WDIOC_GETTIMEOUT: 552 return put_user(heartbeat, p); 553 554 case WDIOC_GETTIMELEFT: 555 { 556 int time_left; 557 558 if (pcipcwd_get_timeleft(&time_left)) 559 return -EFAULT; 560 561 return put_user(time_left, p); 562 } 563 564 default: 565 return -ENOTTY; 566 } 567 } 568 569 static int pcipcwd_open(struct inode *inode, struct file *file) 570 { 571 /* /dev/watchdog can only be opened once */ 572 if (test_and_set_bit(0, &is_active)) { 573 if (debug >= VERBOSE) 574 pr_err("Attempt to open already opened device\n"); 575 return -EBUSY; 576 } 577 578 /* Activate */ 579 pcipcwd_start(); 580 pcipcwd_keepalive(); 581 return nonseekable_open(inode, file); 582 } 583 584 static int pcipcwd_release(struct inode *inode, struct file *file) 585 { 586 /* 587 * Shut off the timer. 588 */ 589 if (expect_release == 42) { 590 pcipcwd_stop(); 591 } else { 592 pr_crit("Unexpected close, not stopping watchdog!\n"); 593 pcipcwd_keepalive(); 594 } 595 expect_release = 0; 596 clear_bit(0, &is_active); 597 return 0; 598 } 599 600 /* 601 * /dev/temperature handling 602 */ 603 604 static ssize_t pcipcwd_temp_read(struct file *file, char __user *data, 605 size_t len, loff_t *ppos) 606 { 607 int temperature; 608 609 if (pcipcwd_get_temperature(&temperature)) 610 return -EFAULT; 611 612 if (copy_to_user(data, &temperature, 1)) 613 return -EFAULT; 614 615 return 1; 616 } 617 618 static int pcipcwd_temp_open(struct inode *inode, struct file *file) 619 { 620 if (!pcipcwd_private.supports_temp) 621 return -ENODEV; 622 623 return nonseekable_open(inode, file); 624 } 625 626 static int pcipcwd_temp_release(struct inode *inode, struct file *file) 627 { 628 return 0; 629 } 630 631 /* 632 * Notify system 633 */ 634 635 static int pcipcwd_notify_sys(struct notifier_block *this, unsigned long code, 636 void *unused) 637 { 638 if (code == SYS_DOWN || code == SYS_HALT) 639 pcipcwd_stop(); /* Turn the WDT off */ 640 641 return NOTIFY_DONE; 642 } 643 644 /* 645 * Kernel Interfaces 646 */ 647 648 static const struct file_operations pcipcwd_fops = { 649 .owner = THIS_MODULE, 650 .llseek = no_llseek, 651 .write = pcipcwd_write, 652 .unlocked_ioctl = pcipcwd_ioctl, 653 .open = pcipcwd_open, 654 .release = pcipcwd_release, 655 }; 656 657 static struct miscdevice pcipcwd_miscdev = { 658 .minor = WATCHDOG_MINOR, 659 .name = "watchdog", 660 .fops = &pcipcwd_fops, 661 }; 662 663 static const struct file_operations pcipcwd_temp_fops = { 664 .owner = THIS_MODULE, 665 .llseek = no_llseek, 666 .read = pcipcwd_temp_read, 667 .open = pcipcwd_temp_open, 668 .release = pcipcwd_temp_release, 669 }; 670 671 static struct miscdevice pcipcwd_temp_miscdev = { 672 .minor = TEMP_MINOR, 673 .name = "temperature", 674 .fops = &pcipcwd_temp_fops, 675 }; 676 677 static struct notifier_block pcipcwd_notifier = { 678 .notifier_call = pcipcwd_notify_sys, 679 }; 680 681 /* 682 * Init & exit routines 683 */ 684 685 static int pcipcwd_card_init(struct pci_dev *pdev, 686 const struct pci_device_id *ent) 687 { 688 int ret = -EIO; 689 690 cards_found++; 691 if (cards_found == 1) 692 pr_info("%s\n", DRIVER_VERSION); 693 694 if (cards_found > 1) { 695 pr_err("This driver only supports 1 device\n"); 696 return -ENODEV; 697 } 698 699 if (pci_enable_device(pdev)) { 700 pr_err("Not possible to enable PCI Device\n"); 701 return -ENODEV; 702 } 703 704 if (pci_resource_start(pdev, 0) == 0x0000) { 705 pr_err("No I/O-Address for card detected\n"); 706 ret = -ENODEV; 707 goto err_out_disable_device; 708 } 709 710 spin_lock_init(&pcipcwd_private.io_lock); 711 pcipcwd_private.pdev = pdev; 712 pcipcwd_private.io_addr = pci_resource_start(pdev, 0); 713 714 if (pci_request_regions(pdev, WATCHDOG_NAME)) { 715 pr_err("I/O address 0x%04x already in use\n", 716 (int) pcipcwd_private.io_addr); 717 ret = -EIO; 718 goto err_out_disable_device; 719 } 720 721 /* get the boot_status */ 722 pcipcwd_get_status(&pcipcwd_private.boot_status); 723 724 /* clear the "card caused reboot" flag */ 725 pcipcwd_clear_status(); 726 727 /* disable card */ 728 pcipcwd_stop(); 729 730 /* Check whether or not the card supports the temperature device */ 731 pcipcwd_check_temperature_support(); 732 733 /* Show info about the card itself */ 734 pcipcwd_show_card_info(); 735 736 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ 737 if (heartbeat == 0) 738 heartbeat = 739 heartbeat_tbl[(pcipcwd_get_option_switches() & 0x07)]; 740 741 /* Check that the heartbeat value is within it's range ; 742 * if not reset to the default */ 743 if (pcipcwd_set_heartbeat(heartbeat)) { 744 pcipcwd_set_heartbeat(WATCHDOG_HEARTBEAT); 745 pr_info("heartbeat value must be 0<heartbeat<65536, using %d\n", 746 WATCHDOG_HEARTBEAT); 747 } 748 749 ret = register_reboot_notifier(&pcipcwd_notifier); 750 if (ret != 0) { 751 pr_err("cannot register reboot notifier (err=%d)\n", ret); 752 goto err_out_release_region; 753 } 754 755 if (pcipcwd_private.supports_temp) { 756 ret = misc_register(&pcipcwd_temp_miscdev); 757 if (ret != 0) { 758 pr_err("cannot register miscdev on minor=%d (err=%d)\n", 759 TEMP_MINOR, ret); 760 goto err_out_unregister_reboot; 761 } 762 } 763 764 ret = misc_register(&pcipcwd_miscdev); 765 if (ret != 0) { 766 pr_err("cannot register miscdev on minor=%d (err=%d)\n", 767 WATCHDOG_MINOR, ret); 768 goto err_out_misc_deregister; 769 } 770 771 pr_info("initialized. heartbeat=%d sec (nowayout=%d)\n", 772 heartbeat, nowayout); 773 774 return 0; 775 776 err_out_misc_deregister: 777 if (pcipcwd_private.supports_temp) 778 misc_deregister(&pcipcwd_temp_miscdev); 779 err_out_unregister_reboot: 780 unregister_reboot_notifier(&pcipcwd_notifier); 781 err_out_release_region: 782 pci_release_regions(pdev); 783 err_out_disable_device: 784 pci_disable_device(pdev); 785 return ret; 786 } 787 788 static void pcipcwd_card_exit(struct pci_dev *pdev) 789 { 790 /* Stop the timer before we leave */ 791 if (!nowayout) 792 pcipcwd_stop(); 793 794 /* Deregister */ 795 misc_deregister(&pcipcwd_miscdev); 796 if (pcipcwd_private.supports_temp) 797 misc_deregister(&pcipcwd_temp_miscdev); 798 unregister_reboot_notifier(&pcipcwd_notifier); 799 pci_release_regions(pdev); 800 pci_disable_device(pdev); 801 cards_found--; 802 } 803 804 static const struct pci_device_id pcipcwd_pci_tbl[] = { 805 { PCI_VENDOR_ID_QUICKLOGIC, PCI_DEVICE_ID_WATCHDOG_PCIPCWD, 806 PCI_ANY_ID, PCI_ANY_ID, }, 807 { 0 }, /* End of list */ 808 }; 809 MODULE_DEVICE_TABLE(pci, pcipcwd_pci_tbl); 810 811 static struct pci_driver pcipcwd_driver = { 812 .name = WATCHDOG_NAME, 813 .id_table = pcipcwd_pci_tbl, 814 .probe = pcipcwd_card_init, 815 .remove = pcipcwd_card_exit, 816 }; 817 818 module_pci_driver(pcipcwd_driver); 819 820 MODULE_AUTHOR("Wim Van Sebroeck <wim@iguana.be>"); 821 MODULE_DESCRIPTION("Berkshire PCI-PC Watchdog driver"); 822 MODULE_LICENSE("GPL"); 823