1 /* 2 * PC Watchdog Driver 3 * by Ken Hollis (khollis@bitgate.com) 4 * 5 * Permission granted from Simon Machell (smachell@berkprod.com) 6 * Written for the Linux Kernel, and GPLed by Ken Hollis 7 * 8 * 960107 Added request_region routines, modulized the whole thing. 9 * 960108 Fixed end-of-file pointer (Thanks to Dan Hollis), added 10 * WD_TIMEOUT define. 11 * 960216 Added eof marker on the file, and changed verbose messages. 12 * 960716 Made functional and cosmetic changes to the source for 13 * inclusion in Linux 2.0.x kernels, thanks to Alan Cox. 14 * 960717 Removed read/seek routines, replaced with ioctl. Also, added 15 * check_region command due to Alan's suggestion. 16 * 960821 Made changes to compile in newer 2.0.x kernels. Added 17 * "cold reboot sense" entry. 18 * 960825 Made a few changes to code, deleted some defines and made 19 * typedefs to replace them. Made heartbeat reset only available 20 * via ioctl, and removed the write routine. 21 * 960828 Added new items for PC Watchdog Rev.C card. 22 * 960829 Changed around all of the IOCTLs, added new features, 23 * added watchdog disable/re-enable routines. Added firmware 24 * version reporting. Added read routine for temperature. 25 * Removed some extra defines, added an autodetect Revision 26 * routine. 27 * 961006 Revised some documentation, fixed some cosmetic bugs. Made 28 * drivers to panic the system if it's overheating at bootup. 29 * 961118 Changed some verbiage on some of the output, tidied up 30 * code bits, and added compatibility to 2.1.x. 31 * 970912 Enabled board on open and disable on close. 32 * 971107 Took account of recent VFS changes (broke read). 33 * 971210 Disable board on initialisation in case board already ticking. 34 * 971222 Changed open/close for temperature handling 35 * Michael Meskes <meskes@debian.org>. 36 * 980112 Used minor numbers from include/linux/miscdevice.h 37 * 990403 Clear reset status after reading control status register in 38 * pcwd_showprevstate(). [Marc Boucher <marc@mbsi.ca>] 39 * 990605 Made changes to code to support Firmware 1.22a, added 40 * fairly useless proc entry. 41 * 990610 removed said useless proc code for the merge <alan> 42 * 000403 Removed last traces of proc code. <davej> 43 * 011214 Added nowayout module option to override 44 * CONFIG_WATCHDOG_NOWAYOUT <Matt_Domsch@dell.com> 45 * Added timeout module option to override default 46 */ 47 48 /* 49 * A bells and whistles driver is available from http://www.pcwd.de/ 50 * More info available at http://www.berkprod.com/ or 51 * http://www.pcwatchdog.com/ 52 */ 53 54 #include <linux/module.h> /* For module specific items */ 55 #include <linux/moduleparam.h> /* For new moduleparam's */ 56 #include <linux/types.h> /* For standard types (like size_t) */ 57 #include <linux/errno.h> /* For the -ENODEV/... values */ 58 #include <linux/kernel.h> /* For printk/panic/... */ 59 #include <linux/delay.h> /* For mdelay function */ 60 #include <linux/timer.h> /* For timer related operations */ 61 #include <linux/jiffies.h> /* For jiffies stuff */ 62 #include <linux/miscdevice.h> /* For MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR) */ 63 #include <linux/watchdog.h> /* For the watchdog specific items */ 64 #include <linux/reboot.h> /* For kernel_power_off() */ 65 #include <linux/init.h> /* For __init/__exit/... */ 66 #include <linux/fs.h> /* For file operations */ 67 #include <linux/isa.h> /* For isa devices */ 68 #include <linux/ioport.h> /* For io-port access */ 69 #include <linux/spinlock.h> /* For spin_lock/spin_unlock/... */ 70 #include <linux/uaccess.h> /* For copy_to_user/put_user/... */ 71 #include <linux/io.h> /* For inb/outb/... */ 72 73 /* Module and version information */ 74 #define WATCHDOG_VERSION "1.20" 75 #define WATCHDOG_DATE "18 Feb 2007" 76 #define WATCHDOG_DRIVER_NAME "ISA-PC Watchdog" 77 #define WATCHDOG_NAME "pcwd" 78 #define PFX WATCHDOG_NAME ": " 79 #define DRIVER_VERSION WATCHDOG_DRIVER_NAME " driver, v" WATCHDOG_VERSION "\n" 80 81 /* 82 * It should be noted that PCWD_REVISION_B was removed because A and B 83 * are essentially the same types of card, with the exception that B 84 * has temperature reporting. Since I didn't receive a Rev.B card, 85 * the Rev.B card is not supported. (It's a good thing too, as they 86 * are no longer in production.) 87 */ 88 #define PCWD_REVISION_A 1 89 #define PCWD_REVISION_C 2 90 91 /* 92 * These are the auto-probe addresses available. 93 * 94 * Revision A only uses ports 0x270 and 0x370. Revision C introduced 0x350. 95 * Revision A has an address range of 2 addresses, while Revision C has 4. 96 */ 97 #define PCWD_ISA_NR_CARDS 3 98 static int pcwd_ioports[] = { 0x270, 0x350, 0x370, 0x000 }; 99 100 /* 101 * These are the defines that describe the control status bits for the 102 * PCI-PC Watchdog card. 103 */ 104 /* Port 1 : Control Status #1 for the PC Watchdog card, revision A. */ 105 #define WD_WDRST 0x01 /* Previously reset state */ 106 #define WD_T110 0x02 /* Temperature overheat sense */ 107 #define WD_HRTBT 0x04 /* Heartbeat sense */ 108 #define WD_RLY2 0x08 /* External relay triggered */ 109 #define WD_SRLY2 0x80 /* Software external relay triggered */ 110 /* Port 1 : Control Status #1 for the PC Watchdog card, revision C. */ 111 #define WD_REVC_WTRP 0x01 /* Watchdog Trip status */ 112 #define WD_REVC_HRBT 0x02 /* Watchdog Heartbeat */ 113 #define WD_REVC_TTRP 0x04 /* Temperature Trip status */ 114 #define WD_REVC_RL2A 0x08 /* Relay 2 activated by 115 on-board processor */ 116 #define WD_REVC_RL1A 0x10 /* Relay 1 active */ 117 #define WD_REVC_R2DS 0x40 /* Relay 2 disable */ 118 #define WD_REVC_RLY2 0x80 /* Relay 2 activated? */ 119 /* Port 2 : Control Status #2 */ 120 #define WD_WDIS 0x10 /* Watchdog Disabled */ 121 #define WD_ENTP 0x20 /* Watchdog Enable Temperature Trip */ 122 #define WD_SSEL 0x40 /* Watchdog Switch Select 123 (1:SW1 <-> 0:SW2) */ 124 #define WD_WCMD 0x80 /* Watchdog Command Mode */ 125 126 /* max. time we give an ISA watchdog card to process a command */ 127 /* 500ms for each 4 bit response (according to spec.) */ 128 #define ISA_COMMAND_TIMEOUT 1000 129 130 /* Watchdog's internal commands */ 131 #define CMD_ISA_IDLE 0x00 132 #define CMD_ISA_VERSION_INTEGER 0x01 133 #define CMD_ISA_VERSION_TENTH 0x02 134 #define CMD_ISA_VERSION_HUNDRETH 0x03 135 #define CMD_ISA_VERSION_MINOR 0x04 136 #define CMD_ISA_SWITCH_SETTINGS 0x05 137 #define CMD_ISA_RESET_PC 0x06 138 #define CMD_ISA_ARM_0 0x07 139 #define CMD_ISA_ARM_30 0x08 140 #define CMD_ISA_ARM_60 0x09 141 #define CMD_ISA_DELAY_TIME_2SECS 0x0A 142 #define CMD_ISA_DELAY_TIME_4SECS 0x0B 143 #define CMD_ISA_DELAY_TIME_8SECS 0x0C 144 #define CMD_ISA_RESET_RELAYS 0x0D 145 146 /* Watchdog's Dip Switch heartbeat values */ 147 static const int heartbeat_tbl[] = { 148 20, /* OFF-OFF-OFF = 20 Sec */ 149 40, /* OFF-OFF-ON = 40 Sec */ 150 60, /* OFF-ON-OFF = 1 Min */ 151 300, /* OFF-ON-ON = 5 Min */ 152 600, /* ON-OFF-OFF = 10 Min */ 153 1800, /* ON-OFF-ON = 30 Min */ 154 3600, /* ON-ON-OFF = 1 Hour */ 155 7200, /* ON-ON-ON = 2 hour */ 156 }; 157 158 /* 159 * We are using an kernel timer to do the pinging of the watchdog 160 * every ~500ms. We try to set the internal heartbeat of the 161 * watchdog to 2 ms. 162 */ 163 164 #define WDT_INTERVAL (HZ/2+1) 165 166 /* We can only use 1 card due to the /dev/watchdog restriction */ 167 static int cards_found; 168 169 /* internal variables */ 170 static unsigned long open_allowed; 171 static char expect_close; 172 static int temp_panic; 173 174 /* this is private data for each ISA-PC watchdog card */ 175 static struct { 176 char fw_ver_str[6]; /* The cards firmware version */ 177 int revision; /* The card's revision */ 178 int supports_temp; /* Whether or not the card has 179 a temperature device */ 180 int command_mode; /* Whether or not the card is in 181 command mode */ 182 int boot_status; /* The card's boot status */ 183 int io_addr; /* The cards I/O address */ 184 spinlock_t io_lock; /* the lock for io operations */ 185 struct timer_list timer; /* The timer that pings the watchdog */ 186 unsigned long next_heartbeat; /* the next_heartbeat for the timer */ 187 } pcwd_private; 188 189 /* module parameters */ 190 #define QUIET 0 /* Default */ 191 #define VERBOSE 1 /* Verbose */ 192 #define DEBUG 2 /* print fancy stuff too */ 193 static int debug = QUIET; 194 module_param(debug, int, 0); 195 MODULE_PARM_DESC(debug, 196 "Debug level: 0=Quiet, 1=Verbose, 2=Debug (default=0)"); 197 198 /* default heartbeat = delay-time from dip-switches */ 199 #define WATCHDOG_HEARTBEAT 0 200 static int heartbeat = WATCHDOG_HEARTBEAT; 201 module_param(heartbeat, int, 0); 202 MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. " 203 "(2 <= heartbeat <= 7200 or 0=delay-time from dip-switches, default=" 204 __MODULE_STRING(WATCHDOG_HEARTBEAT) ")"); 205 206 static int nowayout = WATCHDOG_NOWAYOUT; 207 module_param(nowayout, int, 0); 208 MODULE_PARM_DESC(nowayout, 209 "Watchdog cannot be stopped once started (default=" 210 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); 211 212 /* 213 * Internal functions 214 */ 215 216 static int send_isa_command(int cmd) 217 { 218 int i; 219 int control_status; 220 int port0, last_port0; /* Double read for stabilising */ 221 222 if (debug >= DEBUG) 223 printk(KERN_DEBUG PFX "sending following data cmd=0x%02x\n", 224 cmd); 225 226 /* The WCMD bit must be 1 and the command is only 4 bits in size */ 227 control_status = (cmd & 0x0F) | WD_WCMD; 228 outb_p(control_status, pcwd_private.io_addr + 2); 229 udelay(ISA_COMMAND_TIMEOUT); 230 231 port0 = inb_p(pcwd_private.io_addr); 232 for (i = 0; i < 25; ++i) { 233 last_port0 = port0; 234 port0 = inb_p(pcwd_private.io_addr); 235 236 if (port0 == last_port0) 237 break; /* Data is stable */ 238 239 udelay(250); 240 } 241 242 if (debug >= DEBUG) 243 printk(KERN_DEBUG PFX "received following data for " 244 "cmd=0x%02x: port0=0x%02x last_port0=0x%02x\n", 245 cmd, port0, last_port0); 246 247 return port0; 248 } 249 250 static int set_command_mode(void) 251 { 252 int i, found = 0, count = 0; 253 254 /* Set the card into command mode */ 255 spin_lock(&pcwd_private.io_lock); 256 while ((!found) && (count < 3)) { 257 i = send_isa_command(CMD_ISA_IDLE); 258 259 if (i == 0x00) 260 found = 1; 261 else if (i == 0xF3) { 262 /* Card does not like what we've done to it */ 263 outb_p(0x00, pcwd_private.io_addr + 2); 264 udelay(1200); /* Spec says wait 1ms */ 265 outb_p(0x00, pcwd_private.io_addr + 2); 266 udelay(ISA_COMMAND_TIMEOUT); 267 } 268 count++; 269 } 270 spin_unlock(&pcwd_private.io_lock); 271 pcwd_private.command_mode = found; 272 273 if (debug >= DEBUG) 274 printk(KERN_DEBUG PFX "command_mode=%d\n", 275 pcwd_private.command_mode); 276 277 return found; 278 } 279 280 static void unset_command_mode(void) 281 { 282 /* Set the card into normal mode */ 283 spin_lock(&pcwd_private.io_lock); 284 outb_p(0x00, pcwd_private.io_addr + 2); 285 udelay(ISA_COMMAND_TIMEOUT); 286 spin_unlock(&pcwd_private.io_lock); 287 288 pcwd_private.command_mode = 0; 289 290 if (debug >= DEBUG) 291 printk(KERN_DEBUG PFX "command_mode=%d\n", 292 pcwd_private.command_mode); 293 } 294 295 static inline void pcwd_check_temperature_support(void) 296 { 297 if (inb(pcwd_private.io_addr) != 0xF0) 298 pcwd_private.supports_temp = 1; 299 } 300 301 static inline void pcwd_get_firmware(void) 302 { 303 int one, ten, hund, minor; 304 305 strcpy(pcwd_private.fw_ver_str, "ERROR"); 306 307 if (set_command_mode()) { 308 one = send_isa_command(CMD_ISA_VERSION_INTEGER); 309 ten = send_isa_command(CMD_ISA_VERSION_TENTH); 310 hund = send_isa_command(CMD_ISA_VERSION_HUNDRETH); 311 minor = send_isa_command(CMD_ISA_VERSION_MINOR); 312 sprintf(pcwd_private.fw_ver_str, "%c.%c%c%c", 313 one, ten, hund, minor); 314 } 315 unset_command_mode(); 316 317 return; 318 } 319 320 static inline int pcwd_get_option_switches(void) 321 { 322 int option_switches = 0; 323 324 if (set_command_mode()) { 325 /* Get switch settings */ 326 option_switches = send_isa_command(CMD_ISA_SWITCH_SETTINGS); 327 } 328 329 unset_command_mode(); 330 return option_switches; 331 } 332 333 static void pcwd_show_card_info(void) 334 { 335 int option_switches; 336 337 /* Get some extra info from the hardware (in command/debug/diag mode) */ 338 if (pcwd_private.revision == PCWD_REVISION_A) 339 printk(KERN_INFO PFX 340 "ISA-PC Watchdog (REV.A) detected at port 0x%04x\n", 341 pcwd_private.io_addr); 342 else if (pcwd_private.revision == PCWD_REVISION_C) { 343 pcwd_get_firmware(); 344 printk(KERN_INFO PFX "ISA-PC Watchdog (REV.C) detected at port " 345 "0x%04x (Firmware version: %s)\n", 346 pcwd_private.io_addr, pcwd_private.fw_ver_str); 347 option_switches = pcwd_get_option_switches(); 348 printk(KERN_INFO PFX "Option switches (0x%02x): " 349 "Temperature Reset Enable=%s, Power On Delay=%s\n", 350 option_switches, 351 ((option_switches & 0x10) ? "ON" : "OFF"), 352 ((option_switches & 0x08) ? "ON" : "OFF")); 353 354 /* Reprogram internal heartbeat to 2 seconds */ 355 if (set_command_mode()) { 356 send_isa_command(CMD_ISA_DELAY_TIME_2SECS); 357 unset_command_mode(); 358 } 359 } 360 361 if (pcwd_private.supports_temp) 362 printk(KERN_INFO PFX "Temperature Option Detected\n"); 363 364 if (pcwd_private.boot_status & WDIOF_CARDRESET) 365 printk(KERN_INFO PFX 366 "Previous reboot was caused by the card\n"); 367 368 if (pcwd_private.boot_status & WDIOF_OVERHEAT) { 369 printk(KERN_EMERG PFX 370 "Card senses a CPU Overheat. Panicking!\n"); 371 printk(KERN_EMERG PFX 372 "CPU Overheat\n"); 373 } 374 375 if (pcwd_private.boot_status == 0) 376 printk(KERN_INFO PFX 377 "No previous trip detected - Cold boot or reset\n"); 378 } 379 380 static void pcwd_timer_ping(unsigned long data) 381 { 382 int wdrst_stat; 383 384 /* If we got a heartbeat pulse within the WDT_INTERVAL 385 * we agree to ping the WDT */ 386 if (time_before(jiffies, pcwd_private.next_heartbeat)) { 387 /* Ping the watchdog */ 388 spin_lock(&pcwd_private.io_lock); 389 if (pcwd_private.revision == PCWD_REVISION_A) { 390 /* Rev A cards are reset by setting the 391 WD_WDRST bit in register 1 */ 392 wdrst_stat = inb_p(pcwd_private.io_addr); 393 wdrst_stat &= 0x0F; 394 wdrst_stat |= WD_WDRST; 395 396 outb_p(wdrst_stat, pcwd_private.io_addr + 1); 397 } else { 398 /* Re-trigger watchdog by writing to port 0 */ 399 outb_p(0x00, pcwd_private.io_addr); 400 } 401 402 /* Re-set the timer interval */ 403 mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); 404 405 spin_unlock(&pcwd_private.io_lock); 406 } else { 407 printk(KERN_WARNING PFX 408 "Heartbeat lost! Will not ping the watchdog\n"); 409 } 410 } 411 412 static int pcwd_start(void) 413 { 414 int stat_reg; 415 416 pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); 417 418 /* Start the timer */ 419 mod_timer(&pcwd_private.timer, jiffies + WDT_INTERVAL); 420 421 /* Enable the port */ 422 if (pcwd_private.revision == PCWD_REVISION_C) { 423 spin_lock(&pcwd_private.io_lock); 424 outb_p(0x00, pcwd_private.io_addr + 3); 425 udelay(ISA_COMMAND_TIMEOUT); 426 stat_reg = inb_p(pcwd_private.io_addr + 2); 427 spin_unlock(&pcwd_private.io_lock); 428 if (stat_reg & WD_WDIS) { 429 printk(KERN_INFO PFX "Could not start watchdog\n"); 430 return -EIO; 431 } 432 } 433 434 if (debug >= VERBOSE) 435 printk(KERN_DEBUG PFX "Watchdog started\n"); 436 437 return 0; 438 } 439 440 static int pcwd_stop(void) 441 { 442 int stat_reg; 443 444 /* Stop the timer */ 445 del_timer(&pcwd_private.timer); 446 447 /* Disable the board */ 448 if (pcwd_private.revision == PCWD_REVISION_C) { 449 spin_lock(&pcwd_private.io_lock); 450 outb_p(0xA5, pcwd_private.io_addr + 3); 451 udelay(ISA_COMMAND_TIMEOUT); 452 outb_p(0xA5, pcwd_private.io_addr + 3); 453 udelay(ISA_COMMAND_TIMEOUT); 454 stat_reg = inb_p(pcwd_private.io_addr + 2); 455 spin_unlock(&pcwd_private.io_lock); 456 if ((stat_reg & WD_WDIS) == 0) { 457 printk(KERN_INFO PFX "Could not stop watchdog\n"); 458 return -EIO; 459 } 460 } 461 462 if (debug >= VERBOSE) 463 printk(KERN_DEBUG PFX "Watchdog stopped\n"); 464 465 return 0; 466 } 467 468 static int pcwd_keepalive(void) 469 { 470 /* user land ping */ 471 pcwd_private.next_heartbeat = jiffies + (heartbeat * HZ); 472 473 if (debug >= DEBUG) 474 printk(KERN_DEBUG PFX "Watchdog keepalive signal send\n"); 475 476 return 0; 477 } 478 479 static int pcwd_set_heartbeat(int t) 480 { 481 if (t < 2 || t > 7200) /* arbitrary upper limit */ 482 return -EINVAL; 483 484 heartbeat = t; 485 486 if (debug >= VERBOSE) 487 printk(KERN_DEBUG PFX "New heartbeat: %d\n", 488 heartbeat); 489 490 return 0; 491 } 492 493 static int pcwd_get_status(int *status) 494 { 495 int control_status; 496 497 *status = 0; 498 spin_lock(&pcwd_private.io_lock); 499 if (pcwd_private.revision == PCWD_REVISION_A) 500 /* Rev A cards return status information from 501 * the base register, which is used for the 502 * temperature in other cards. */ 503 control_status = inb(pcwd_private.io_addr); 504 else { 505 /* Rev C cards return card status in the base 506 * address + 1 register. And use different bits 507 * to indicate a card initiated reset, and an 508 * over-temperature condition. And the reboot 509 * status can be reset. */ 510 control_status = inb(pcwd_private.io_addr + 1); 511 } 512 spin_unlock(&pcwd_private.io_lock); 513 514 if (pcwd_private.revision == PCWD_REVISION_A) { 515 if (control_status & WD_WDRST) 516 *status |= WDIOF_CARDRESET; 517 518 if (control_status & WD_T110) { 519 *status |= WDIOF_OVERHEAT; 520 if (temp_panic) { 521 printk(KERN_INFO PFX 522 "Temperature overheat trip!\n"); 523 kernel_power_off(); 524 } 525 } 526 } else { 527 if (control_status & WD_REVC_WTRP) 528 *status |= WDIOF_CARDRESET; 529 530 if (control_status & WD_REVC_TTRP) { 531 *status |= WDIOF_OVERHEAT; 532 if (temp_panic) { 533 printk(KERN_INFO PFX 534 "Temperature overheat trip!\n"); 535 kernel_power_off(); 536 } 537 } 538 } 539 540 return 0; 541 } 542 543 static int pcwd_clear_status(void) 544 { 545 int control_status; 546 547 if (pcwd_private.revision == PCWD_REVISION_C) { 548 spin_lock(&pcwd_private.io_lock); 549 550 if (debug >= VERBOSE) 551 printk(KERN_INFO PFX 552 "clearing watchdog trip status\n"); 553 554 control_status = inb_p(pcwd_private.io_addr + 1); 555 556 if (debug >= DEBUG) { 557 printk(KERN_DEBUG PFX "status was: 0x%02x\n", 558 control_status); 559 printk(KERN_DEBUG PFX "sending: 0x%02x\n", 560 (control_status & WD_REVC_R2DS)); 561 } 562 563 /* clear reset status & Keep Relay 2 disable state as it is */ 564 outb_p((control_status & WD_REVC_R2DS), 565 pcwd_private.io_addr + 1); 566 567 spin_unlock(&pcwd_private.io_lock); 568 } 569 return 0; 570 } 571 572 static int pcwd_get_temperature(int *temperature) 573 { 574 /* check that port 0 gives temperature info and no command results */ 575 if (pcwd_private.command_mode) 576 return -1; 577 578 *temperature = 0; 579 if (!pcwd_private.supports_temp) 580 return -ENODEV; 581 582 /* 583 * Convert celsius to fahrenheit, since this was 584 * the decided 'standard' for this return value. 585 */ 586 spin_lock(&pcwd_private.io_lock); 587 *temperature = ((inb(pcwd_private.io_addr)) * 9 / 5) + 32; 588 spin_unlock(&pcwd_private.io_lock); 589 590 if (debug >= DEBUG) { 591 printk(KERN_DEBUG PFX "temperature is: %d F\n", 592 *temperature); 593 } 594 595 return 0; 596 } 597 598 /* 599 * /dev/watchdog handling 600 */ 601 602 static long pcwd_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 603 { 604 int rv; 605 int status; 606 int temperature; 607 int new_heartbeat; 608 int __user *argp = (int __user *)arg; 609 static const struct watchdog_info ident = { 610 .options = WDIOF_OVERHEAT | 611 WDIOF_CARDRESET | 612 WDIOF_KEEPALIVEPING | 613 WDIOF_SETTIMEOUT | 614 WDIOF_MAGICCLOSE, 615 .firmware_version = 1, 616 .identity = "PCWD", 617 }; 618 619 switch (cmd) { 620 case WDIOC_GETSUPPORT: 621 if (copy_to_user(argp, &ident, sizeof(ident))) 622 return -EFAULT; 623 return 0; 624 625 case WDIOC_GETSTATUS: 626 pcwd_get_status(&status); 627 return put_user(status, argp); 628 629 case WDIOC_GETBOOTSTATUS: 630 return put_user(pcwd_private.boot_status, argp); 631 632 case WDIOC_GETTEMP: 633 if (pcwd_get_temperature(&temperature)) 634 return -EFAULT; 635 636 return put_user(temperature, argp); 637 638 case WDIOC_SETOPTIONS: 639 if (pcwd_private.revision == PCWD_REVISION_C) { 640 if (get_user(rv, argp)) 641 return -EFAULT; 642 643 if (rv & WDIOS_DISABLECARD) { 644 status = pcwd_stop(); 645 if (status < 0) 646 return status; 647 } 648 if (rv & WDIOS_ENABLECARD) { 649 status = pcwd_start(); 650 if (status < 0) 651 return status; 652 } 653 if (rv & WDIOS_TEMPPANIC) 654 temp_panic = 1; 655 } 656 return -EINVAL; 657 658 case WDIOC_KEEPALIVE: 659 pcwd_keepalive(); 660 return 0; 661 662 case WDIOC_SETTIMEOUT: 663 if (get_user(new_heartbeat, argp)) 664 return -EFAULT; 665 666 if (pcwd_set_heartbeat(new_heartbeat)) 667 return -EINVAL; 668 669 pcwd_keepalive(); 670 /* Fall */ 671 672 case WDIOC_GETTIMEOUT: 673 return put_user(heartbeat, argp); 674 675 default: 676 return -ENOTTY; 677 } 678 679 return 0; 680 } 681 682 static ssize_t pcwd_write(struct file *file, const char __user *buf, size_t len, 683 loff_t *ppos) 684 { 685 if (len) { 686 if (!nowayout) { 687 size_t i; 688 689 /* In case it was set long ago */ 690 expect_close = 0; 691 692 for (i = 0; i != len; i++) { 693 char c; 694 695 if (get_user(c, buf + i)) 696 return -EFAULT; 697 if (c == 'V') 698 expect_close = 42; 699 } 700 } 701 pcwd_keepalive(); 702 } 703 return len; 704 } 705 706 static int pcwd_open(struct inode *inode, struct file *file) 707 { 708 if (test_and_set_bit(0, &open_allowed)) 709 return -EBUSY; 710 if (nowayout) 711 __module_get(THIS_MODULE); 712 /* Activate */ 713 pcwd_start(); 714 pcwd_keepalive(); 715 return nonseekable_open(inode, file); 716 } 717 718 static int pcwd_close(struct inode *inode, struct file *file) 719 { 720 if (expect_close == 42) 721 pcwd_stop(); 722 else { 723 printk(KERN_CRIT PFX 724 "Unexpected close, not stopping watchdog!\n"); 725 pcwd_keepalive(); 726 } 727 expect_close = 0; 728 clear_bit(0, &open_allowed); 729 return 0; 730 } 731 732 /* 733 * /dev/temperature handling 734 */ 735 736 static ssize_t pcwd_temp_read(struct file *file, char __user *buf, size_t count, 737 loff_t *ppos) 738 { 739 int temperature; 740 741 if (pcwd_get_temperature(&temperature)) 742 return -EFAULT; 743 744 if (copy_to_user(buf, &temperature, 1)) 745 return -EFAULT; 746 747 return 1; 748 } 749 750 static int pcwd_temp_open(struct inode *inode, struct file *file) 751 { 752 if (!pcwd_private.supports_temp) 753 return -ENODEV; 754 755 return nonseekable_open(inode, file); 756 } 757 758 static int pcwd_temp_close(struct inode *inode, struct file *file) 759 { 760 return 0; 761 } 762 763 /* 764 * Kernel Interfaces 765 */ 766 767 static const struct file_operations pcwd_fops = { 768 .owner = THIS_MODULE, 769 .llseek = no_llseek, 770 .write = pcwd_write, 771 .unlocked_ioctl = pcwd_ioctl, 772 .open = pcwd_open, 773 .release = pcwd_close, 774 }; 775 776 static struct miscdevice pcwd_miscdev = { 777 .minor = WATCHDOG_MINOR, 778 .name = "watchdog", 779 .fops = &pcwd_fops, 780 }; 781 782 static const struct file_operations pcwd_temp_fops = { 783 .owner = THIS_MODULE, 784 .llseek = no_llseek, 785 .read = pcwd_temp_read, 786 .open = pcwd_temp_open, 787 .release = pcwd_temp_close, 788 }; 789 790 static struct miscdevice temp_miscdev = { 791 .minor = TEMP_MINOR, 792 .name = "temperature", 793 .fops = &pcwd_temp_fops, 794 }; 795 796 /* 797 * Init & exit routines 798 */ 799 800 static inline int get_revision(void) 801 { 802 int r = PCWD_REVISION_C; 803 804 spin_lock(&pcwd_private.io_lock); 805 /* REV A cards use only 2 io ports; test 806 * presumes a floating bus reads as 0xff. */ 807 if ((inb(pcwd_private.io_addr + 2) == 0xFF) || 808 (inb(pcwd_private.io_addr + 3) == 0xFF)) 809 r = PCWD_REVISION_A; 810 spin_unlock(&pcwd_private.io_lock); 811 812 return r; 813 } 814 815 /* 816 * The ISA cards have a heartbeat bit in one of the registers, which 817 * register is card dependent. The heartbeat bit is monitored, and if 818 * found, is considered proof that a Berkshire card has been found. 819 * The initial rate is once per second at board start up, then twice 820 * per second for normal operation. 821 */ 822 static int __devinit pcwd_isa_match(struct device *dev, unsigned int id) 823 { 824 int base_addr = pcwd_ioports[id]; 825 int port0, last_port0; /* Reg 0, in case it's REV A */ 826 int port1, last_port1; /* Register 1 for REV C cards */ 827 int i; 828 int retval; 829 830 if (debug >= DEBUG) 831 printk(KERN_DEBUG PFX "pcwd_isa_match id=%d\n", 832 id); 833 834 if (!request_region(base_addr, 4, "PCWD")) { 835 printk(KERN_INFO PFX "Port 0x%04x unavailable\n", base_addr); 836 return 0; 837 } 838 839 retval = 0; 840 841 port0 = inb_p(base_addr); /* For REV A boards */ 842 port1 = inb_p(base_addr + 1); /* For REV C boards */ 843 if (port0 != 0xff || port1 != 0xff) { 844 /* Not an 'ff' from a floating bus, so must be a card! */ 845 for (i = 0; i < 4; ++i) { 846 847 msleep(500); 848 849 last_port0 = port0; 850 last_port1 = port1; 851 852 port0 = inb_p(base_addr); 853 port1 = inb_p(base_addr + 1); 854 855 /* Has either hearbeat bit changed? */ 856 if ((port0 ^ last_port0) & WD_HRTBT || 857 (port1 ^ last_port1) & WD_REVC_HRBT) { 858 retval = 1; 859 break; 860 } 861 } 862 } 863 release_region(base_addr, 4); 864 865 return retval; 866 } 867 868 static int __devinit pcwd_isa_probe(struct device *dev, unsigned int id) 869 { 870 int ret; 871 872 if (debug >= DEBUG) 873 printk(KERN_DEBUG PFX "pcwd_isa_probe id=%d\n", 874 id); 875 876 cards_found++; 877 if (cards_found == 1) 878 printk(KERN_INFO PFX "v%s Ken Hollis (kenji@bitgate.com)\n", 879 WATCHDOG_VERSION); 880 881 if (cards_found > 1) { 882 printk(KERN_ERR PFX "This driver only supports 1 device\n"); 883 return -ENODEV; 884 } 885 886 if (pcwd_ioports[id] == 0x0000) { 887 printk(KERN_ERR PFX "No I/O-Address for card detected\n"); 888 return -ENODEV; 889 } 890 pcwd_private.io_addr = pcwd_ioports[id]; 891 892 spin_lock_init(&pcwd_private.io_lock); 893 894 /* Check card's revision */ 895 pcwd_private.revision = get_revision(); 896 897 if (!request_region(pcwd_private.io_addr, 898 (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4, "PCWD")) { 899 printk(KERN_ERR PFX "I/O address 0x%04x already in use\n", 900 pcwd_private.io_addr); 901 ret = -EIO; 902 goto error_request_region; 903 } 904 905 /* Initial variables */ 906 pcwd_private.supports_temp = 0; 907 temp_panic = 0; 908 pcwd_private.boot_status = 0x0000; 909 910 /* get the boot_status */ 911 pcwd_get_status(&pcwd_private.boot_status); 912 913 /* clear the "card caused reboot" flag */ 914 pcwd_clear_status(); 915 916 setup_timer(&pcwd_private.timer, pcwd_timer_ping, 0); 917 918 /* Disable the board */ 919 pcwd_stop(); 920 921 /* Check whether or not the card supports the temperature device */ 922 pcwd_check_temperature_support(); 923 924 /* Show info about the card itself */ 925 pcwd_show_card_info(); 926 927 /* If heartbeat = 0 then we use the heartbeat from the dip-switches */ 928 if (heartbeat == 0) 929 heartbeat = heartbeat_tbl[(pcwd_get_option_switches() & 0x07)]; 930 931 /* Check that the heartbeat value is within it's range; 932 if not reset to the default */ 933 if (pcwd_set_heartbeat(heartbeat)) { 934 pcwd_set_heartbeat(WATCHDOG_HEARTBEAT); 935 printk(KERN_INFO PFX 936 "heartbeat value must be 2 <= heartbeat <= 7200, using %d\n", 937 WATCHDOG_HEARTBEAT); 938 } 939 940 if (pcwd_private.supports_temp) { 941 ret = misc_register(&temp_miscdev); 942 if (ret) { 943 printk(KERN_ERR PFX 944 "cannot register miscdev on minor=%d (err=%d)\n", 945 TEMP_MINOR, ret); 946 goto error_misc_register_temp; 947 } 948 } 949 950 ret = misc_register(&pcwd_miscdev); 951 if (ret) { 952 printk(KERN_ERR PFX 953 "cannot register miscdev on minor=%d (err=%d)\n", 954 WATCHDOG_MINOR, ret); 955 goto error_misc_register_watchdog; 956 } 957 958 printk(KERN_INFO PFX "initialized. heartbeat=%d sec (nowayout=%d)\n", 959 heartbeat, nowayout); 960 961 return 0; 962 963 error_misc_register_watchdog: 964 if (pcwd_private.supports_temp) 965 misc_deregister(&temp_miscdev); 966 error_misc_register_temp: 967 release_region(pcwd_private.io_addr, 968 (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); 969 error_request_region: 970 pcwd_private.io_addr = 0x0000; 971 cards_found--; 972 return ret; 973 } 974 975 static int __devexit pcwd_isa_remove(struct device *dev, unsigned int id) 976 { 977 if (debug >= DEBUG) 978 printk(KERN_DEBUG PFX "pcwd_isa_remove id=%d\n", 979 id); 980 981 if (!pcwd_private.io_addr) 982 return 1; 983 984 /* Disable the board */ 985 if (!nowayout) 986 pcwd_stop(); 987 988 /* Deregister */ 989 misc_deregister(&pcwd_miscdev); 990 if (pcwd_private.supports_temp) 991 misc_deregister(&temp_miscdev); 992 release_region(pcwd_private.io_addr, 993 (pcwd_private.revision == PCWD_REVISION_A) ? 2 : 4); 994 pcwd_private.io_addr = 0x0000; 995 cards_found--; 996 997 return 0; 998 } 999 1000 static void pcwd_isa_shutdown(struct device *dev, unsigned int id) 1001 { 1002 if (debug >= DEBUG) 1003 printk(KERN_DEBUG PFX "pcwd_isa_shutdown id=%d\n", 1004 id); 1005 1006 pcwd_stop(); 1007 } 1008 1009 static struct isa_driver pcwd_isa_driver = { 1010 .match = pcwd_isa_match, 1011 .probe = pcwd_isa_probe, 1012 .remove = __devexit_p(pcwd_isa_remove), 1013 .shutdown = pcwd_isa_shutdown, 1014 .driver = { 1015 .owner = THIS_MODULE, 1016 .name = WATCHDOG_NAME, 1017 }, 1018 }; 1019 1020 static int __init pcwd_init_module(void) 1021 { 1022 return isa_register_driver(&pcwd_isa_driver, PCWD_ISA_NR_CARDS); 1023 } 1024 1025 static void __exit pcwd_cleanup_module(void) 1026 { 1027 isa_unregister_driver(&pcwd_isa_driver); 1028 printk(KERN_INFO PFX "Watchdog Module Unloaded.\n"); 1029 } 1030 1031 module_init(pcwd_init_module); 1032 module_exit(pcwd_cleanup_module); 1033 1034 MODULE_AUTHOR("Ken Hollis <kenji@bitgate.com>, " 1035 "Wim Van Sebroeck <wim@iguana.be>"); 1036 MODULE_DESCRIPTION("Berkshire ISA-PC Watchdog driver"); 1037 MODULE_VERSION(WATCHDOG_VERSION); 1038 MODULE_LICENSE("GPL"); 1039 MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR); 1040 MODULE_ALIAS_MISCDEV(TEMP_MINOR); 1041