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