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"); 819