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