release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/watchdog/f71808e_wdt.c

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Hans Edgington <hans@edgington.nl>              *
   3  *   Copyright (C) 2007-2009 Hans de Goede <hdegoede@redhat.com>           *
   4  *   Copyright (C) 2010 Giel van Schijndel <me@mortis.eu>                  *
   5  *                                                                         *
   6  *   This program is free software; you can redistribute it and/or modify  *
   7  *   it under the terms of the GNU General Public License as published by  *
   8  *   the Free Software Foundation; either version 2 of the License, or     *
   9  *   (at your option) any later version.                                   *
  10  *                                                                         *
  11  *   This program is distributed in the hope that it will be useful,       *
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  14  *   GNU General Public License for more details.                          *
  15  *                                                                         *
  16  *   You should have received a copy of the GNU General Public License     *
  17  *   along with this program; if not, write to the                         *
  18  *   Free Software Foundation, Inc.,                                       *
  19  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  20  ***************************************************************************/
  21
  22 #include <linux/err.h>
  23 #include <linux/fs.h>
  24 #include <linux/init.h>
  25 #include <linux/io.h>
  26 #include <linux/ioport.h>
  27 #include <linux/miscdevice.h>
  28 #include <linux/module.h>
  29 #include <linux/mutex.h>
  30 #include <linux/notifier.h>
  31 #include <linux/reboot.h>
  32 #include <linux/uaccess.h>
  33 #include <linux/watchdog.h>
  34
  35 #define DRVNAME "f71808e_wdt"
  36
  37 #define SIO_F71808FG_LD_WDT     0x07    /* Watchdog timer logical device */
  38 #define SIO_UNLOCK_KEY          0x87    /* Key to enable Super-I/O */
  39 #define SIO_LOCK_KEY            0xAA    /* Key to diasble Super-I/O */
  40
  41 #define SIO_REG_LDSEL           0x07    /* Logical device select */
  42 #define SIO_REG_DEVID           0x20    /* Device ID (2 bytes) */
  43 #define SIO_REG_DEVREV          0x22    /* Device revision */
  44 #define SIO_REG_MANID           0x23    /* Fintek ID (2 bytes) */
  45 #define SIO_REG_ENABLE          0x30    /* Logical device enable */
  46 #define SIO_REG_ADDR            0x60    /* Logical device address (2 bytes) */
  47
  48 #define SIO_FINTEK_ID           0x1934  /* Manufacturers ID */
  49 #define SIO_F71808_ID           0x0901  /* Chipset ID */
  50 #define SIO_F71858_ID           0x0507  /* Chipset ID */
  51 #define SIO_F71862_ID           0x0601  /* Chipset ID */
  52 #define SIO_F71882_ID           0x0541  /* Chipset ID */
  53 #define SIO_F71889_ID           0x0723  /* Chipset ID */
  54
  55 #define F71882FG_REG_START              0x01
  56
  57 #define F71808FG_REG_WDO_CONF           0xf0
  58 #define F71808FG_REG_WDT_CONF           0xf5
  59 #define F71808FG_REG_WD_TIME            0xf6
  60
  61 #define F71808FG_FLAG_WDOUT_EN          7
  62
  63 #define F71808FG_FLAG_WDTMOUT_STS       5
  64 #define F71808FG_FLAG_WD_EN             5
  65 #define F71808FG_FLAG_WD_PULSE          4
  66 #define F71808FG_FLAG_WD_UNIT           3
  67
  68 /* Default values */
  69 #define WATCHDOG_TIMEOUT        60      /* 1 minute default timeout */
  70 #define WATCHDOG_MAX_TIMEOUT    (60 * 255)
  71 #define WATCHDOG_PULSE_WIDTH    125     /* 125 ms, default pulse width for
  72                                            watchdog signal */
  73
  74 static unsigned short force_id;
  75 module_param(force_id, ushort, 0);
  76 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  77
  78 static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
  79 static int timeout = 60;        /* default timeout in seconds */
  80 module_param(timeout, int, 0);
  81 MODULE_PARM_DESC(timeout,
  82         "Watchdog timeout in seconds. 1<= timeout <="
  83                         __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
  84                         __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
  85
  86 static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
  87 module_param(pulse_width, uint, 0);
  88 MODULE_PARM_DESC(pulse_width,
  89         "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
  90                         " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
  91
  92 static int nowayout = WATCHDOG_NOWAYOUT;
  93 module_param(nowayout, bool, 0444);
  94 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
  95
  96 static unsigned int start_withtimeout;
  97 module_param(start_withtimeout, uint, 0);
  98 MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
  99         " given initial timeout. Zero (default) disables this feature.");
 100
 101 enum chips { f71808fg, f71858fg, f71862fg, f71882fg, f71889fg };
 102
 103 static const char *f71808e_names[] = {
 104         "f71808fg",
 105         "f71858fg",
 106         "f71862fg",
 107         "f71882fg",
 108         "f71889fg",
 109 };
 110
 111 /* Super-I/O Function prototypes */
 112 static inline int superio_inb(int base, int reg);
 113 static inline int superio_inw(int base, int reg);
 114 static inline void superio_outb(int base, int reg, u8 val);
 115 static inline void superio_set_bit(int base, int reg, int bit);
 116 static inline void superio_clear_bit(int base, int reg, int bit);
 117 static inline int superio_enter(int base);
 118 static inline void superio_select(int base, int ld);
 119 static inline void superio_exit(int base);
 120
 121 struct watchdog_data {
 122         unsigned short  sioaddr;
 123         enum chips      type;
 124         unsigned long   opened;
 125         struct mutex    lock;
 126         char            expect_close;
 127         struct watchdog_info ident;
 128
 129         unsigned short  timeout;
 130         u8              timer_val;      /* content for the wd_time register */
 131         char            minutes_mode;
 132         u8              pulse_val;      /* pulse width flag */
 133         char            pulse_mode;     /* enable pulse output mode? */
 134         char            caused_reboot;  /* last reboot was by the watchdog */
 135 };
 136
 137 static struct watchdog_data watchdog = {
 138         .lock = __MUTEX_INITIALIZER(watchdog.lock),
 139 };
 140
 141 /* Super I/O functions */
 142 static inline int superio_inb(int base, int reg)
 143 {
 144         outb(reg, base);
 145         return inb(base + 1);
 146 }
 147
 148 static int superio_inw(int base, int reg)
 149 {
 150         int val;
 151         val  = superio_inb(base, reg) << 8;
 152         val |= superio_inb(base, reg + 1);
 153         return val;
 154 }
 155
 156 static inline void superio_outb(int base, int reg, u8 val)
 157 {
 158         outb(reg, base);
 159         outb(val, base + 1);
 160 }
 161
 162 static inline void superio_set_bit(int base, int reg, int bit)
 163 {
 164         unsigned long val = superio_inb(base, reg);
 165         __set_bit(bit, &val);
 166         superio_outb(base, reg, val);
 167 }
 168
 169 static inline void superio_clear_bit(int base, int reg, int bit)
 170 {
 171         unsigned long val = superio_inb(base, reg);
 172         __clear_bit(bit, &val);
 173         superio_outb(base, reg, val);
 174 }
 175
 176 static inline int superio_enter(int base)
 177 {
 178         /* Don't step on other drivers' I/O space by accident */
 179         if (!request_muxed_region(base, 2, DRVNAME)) {
 180                 printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n",
 181                                 (int)base);
 182                 return -EBUSY;
 183         }
 184
 185         /* according to the datasheet the key must be send twice! */
 186         outb(SIO_UNLOCK_KEY, base);
 187         outb(SIO_UNLOCK_KEY, base);
 188
 189         return 0;
 190 }
 191
 192 static inline void superio_select(int base, int ld)
 193 {
 194         outb(SIO_REG_LDSEL, base);
 195         outb(ld, base + 1);
 196 }
 197
 198 static inline void superio_exit(int base)
 199 {
 200         outb(SIO_LOCK_KEY, base);
 201         release_region(base, 2);
 202 }
 203
 204 static int watchdog_set_timeout(int timeout)
 205 {
 206         if (timeout <= 0
 207          || timeout >  max_timeout) {
 208                 printk(KERN_ERR DRVNAME ": watchdog timeout out of range\n");
 209                 return -EINVAL;
 210         }
 211
 212         mutex_lock(&watchdog.lock);
 213
 214         watchdog.timeout = timeout;
 215         if (timeout > 0xff) {
 216                 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
 217                 watchdog.minutes_mode = true;
 218         } else {
 219                 watchdog.timer_val = timeout;
 220                 watchdog.minutes_mode = false;
 221         }
 222
 223         mutex_unlock(&watchdog.lock);
 224
 225         return 0;
 226 }
 227
 228 static int watchdog_set_pulse_width(unsigned int pw)
 229 {
 230         int err = 0;
 231
 232         mutex_lock(&watchdog.lock);
 233
 234         if        (pw <=    1) {
 235                 watchdog.pulse_val = 0;
 236         } else if (pw <=   25) {
 237                 watchdog.pulse_val = 1;
 238         } else if (pw <=  125) {
 239                 watchdog.pulse_val = 2;
 240         } else if (pw <= 5000) {
 241                 watchdog.pulse_val = 3;
 242         } else {
 243                 printk(KERN_ERR DRVNAME ": pulse width out of range\n");
 244                 err = -EINVAL;
 245                 goto exit_unlock;
 246         }
 247
 248         watchdog.pulse_mode = pw;
 249
 250 exit_unlock:
 251         mutex_unlock(&watchdog.lock);
 252         return err;
 253 }
 254
 255 static int watchdog_keepalive(void)
 256 {
 257         int err = 0;
 258
 259         mutex_lock(&watchdog.lock);
 260         err = superio_enter(watchdog.sioaddr);
 261         if (err)
 262                 goto exit_unlock;
 263         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 264
 265         if (watchdog.minutes_mode)
 266                 /* select minutes for timer units */
 267                 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 268                                 F71808FG_FLAG_WD_UNIT);
 269         else
 270                 /* select seconds for timer units */
 271                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 272                                 F71808FG_FLAG_WD_UNIT);
 273
 274         /* Set timer value */
 275         superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
 276                            watchdog.timer_val);
 277
 278         superio_exit(watchdog.sioaddr);
 279
 280 exit_unlock:
 281         mutex_unlock(&watchdog.lock);
 282         return err;
 283 }
 284
 285 static int watchdog_start(void)
 286 {
 287         /* Make sure we don't die as soon as the watchdog is enabled below */
 288         int err = watchdog_keepalive();
 289         if (err)
 290                 return err;
 291
 292         mutex_lock(&watchdog.lock);
 293         err = superio_enter(watchdog.sioaddr);
 294         if (err)
 295                 goto exit_unlock;
 296         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 297
 298         /* Watchdog pin configuration */
 299         switch (watchdog.type) {
 300         case f71808fg:
 301                 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
 302                 superio_clear_bit(watchdog.sioaddr, 0x2a, 3);
 303                 superio_clear_bit(watchdog.sioaddr, 0x2b, 3);
 304                 break;
 305
 306         case f71882fg:
 307                 /* Set pin 56 to WDTRST# */
 308                 superio_set_bit(watchdog.sioaddr, 0x29, 1);
 309                 break;
 310
 311         default:
 312                 /*
 313                  * 'default' label to shut up the compiler and catch
 314                  * programmer errors
 315                  */
 316                 err = -ENODEV;
 317                 goto exit_superio;
 318         }
 319
 320         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 321         superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
 322         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
 323                         F71808FG_FLAG_WDOUT_EN);
 324
 325         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 326                         F71808FG_FLAG_WD_EN);
 327
 328         if (watchdog.pulse_mode) {
 329                 /* Select "pulse" output mode with given duration */
 330                 u8 wdt_conf = superio_inb(watchdog.sioaddr,
 331                                 F71808FG_REG_WDT_CONF);
 332
 333                 /* Set WD_PSWIDTH bits (1:0) */
 334                 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
 335                 /* Set WD_PULSE to "pulse" mode */
 336                 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
 337
 338                 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 339                                 wdt_conf);
 340         } else {
 341                 /* Select "level" output mode */
 342                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 343                                 F71808FG_FLAG_WD_PULSE);
 344         }
 345
 346 exit_superio:
 347         superio_exit(watchdog.sioaddr);
 348 exit_unlock:
 349         mutex_unlock(&watchdog.lock);
 350
 351         return err;
 352 }
 353
 354 static int watchdog_stop(void)
 355 {
 356         int err = 0;
 357
 358         mutex_lock(&watchdog.lock);
 359         err = superio_enter(watchdog.sioaddr);
 360         if (err)
 361                 goto exit_unlock;
 362         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 363
 364         superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 365                         F71808FG_FLAG_WD_EN);
 366
 367         superio_exit(watchdog.sioaddr);
 368
 369 exit_unlock:
 370         mutex_unlock(&watchdog.lock);
 371
 372         return err;
 373 }
 374
 375 static int watchdog_get_status(void)
 376 {
 377         int status = 0;
 378
 379         mutex_lock(&watchdog.lock);
 380         status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
 381         mutex_unlock(&watchdog.lock);
 382
 383         return status;
 384 }
 385
 386 static bool watchdog_is_running(void)
 387 {
 388         /*
 389          * if we fail to determine the watchdog's status assume it to be
 390          * running to be on the safe side
 391          */
 392         bool is_running = true;
 393
 394         mutex_lock(&watchdog.lock);
 395         if (superio_enter(watchdog.sioaddr))
 396                 goto exit_unlock;
 397         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 398
 399         is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
 400                 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
 401                         & F71808FG_FLAG_WD_EN);
 402
 403         superio_exit(watchdog.sioaddr);
 404
 405 exit_unlock:
 406         mutex_unlock(&watchdog.lock);
 407         return is_running;
 408 }
 409
 410 /* /dev/watchdog api */
 411
 412 static int watchdog_open(struct inode *inode, struct file *file)
 413 {
 414         int err;
 415
 416         /* If the watchdog is alive we don't need to start it again */
 417         if (test_and_set_bit(0, &watchdog.opened))
 418                 return -EBUSY;
 419
 420         err = watchdog_start();
 421         if (err) {
 422                 clear_bit(0, &watchdog.opened);
 423                 return err;
 424         }
 425
 426         if (nowayout)
 427                 __module_get(THIS_MODULE);
 428
 429         watchdog.expect_close = 0;
 430         return nonseekable_open(inode, file);
 431 }
 432
 433 static int watchdog_release(struct inode *inode, struct file *file)
 434 {
 435         clear_bit(0, &watchdog.opened);
 436
 437         if (!watchdog.expect_close) {
 438                 watchdog_keepalive();
 439                 printk(KERN_CRIT DRVNAME
 440                         ": Unexpected close, not stopping watchdog!\n");
 441         } else if (!nowayout) {
 442                 watchdog_stop();
 443         }
 444         return 0;
 445 }
 446
 447 /*
 448  *      watchdog_write:
 449  *      @file: file handle to the watchdog
 450  *      @buf: buffer to write
 451  *      @count: count of bytes
 452  *      @ppos: pointer to the position to write. No seeks allowed
 453  *
 454  *      A write to a watchdog device is defined as a keepalive signal. Any
 455  *      write of data will do, as we we don't define content meaning.
 456  */
 457
 458 static ssize_t watchdog_write(struct file *file, const char __user *buf,
 459                             size_t count, loff_t *ppos)
 460 {
 461         if (count) {
 462                 if (!nowayout) {
 463                         size_t i;
 464
 465                         /* In case it was set long ago */
 466                         bool expect_close = false;
 467
 468                         for (i = 0; i != count; i++) {
 469                                 char c;
 470                                 if (get_user(c, buf + i))
 471                                         return -EFAULT;
 472                                 expect_close = (c == 'V');
 473                         }
 474
 475                         /* Properly order writes across fork()ed processes */
 476                         mutex_lock(&watchdog.lock);
 477                         watchdog.expect_close = expect_close;
 478                         mutex_unlock(&watchdog.lock);
 479                 }
 480
 481                 /* someone wrote to us, we should restart timer */
 482                 watchdog_keepalive();
 483         }
 484         return count;
 485 }
 486
 487 /*
 488  *      watchdog_ioctl:
 489  *      @inode: inode of the device
 490  *      @file: file handle to the device
 491  *      @cmd: watchdog command
 492  *      @arg: argument pointer
 493  *
 494  *      The watchdog API defines a common set of functions for all watchdogs
 495  *      according to their available features.
 496  */
 497 static long watchdog_ioctl(struct file *file, unsigned int cmd,
 498         unsigned long arg)
 499 {
 500         int status;
 501         int new_options;
 502         int new_timeout;
 503         union {
 504                 struct watchdog_info __user *ident;
 505                 int __user *i;
 506         } uarg;
 507
 508         uarg.i = (int __user *)arg;
 509
 510         switch (cmd) {
 511         case WDIOC_GETSUPPORT:
 512                 return copy_to_user(uarg.ident, &watchdog.ident,
 513                         sizeof(watchdog.ident)) ? -EFAULT : 0;
 514
 515         case WDIOC_GETSTATUS:
 516                 status = watchdog_get_status();
 517                 if (status < 0)
 518                         return status;
 519                 return put_user(status, uarg.i);
 520
 521         case WDIOC_GETBOOTSTATUS:
 522                 return put_user(0, uarg.i);
 523
 524         case WDIOC_SETOPTIONS:
 525                 if (get_user(new_options, uarg.i))
 526                         return -EFAULT;
 527
 528                 if (new_options & WDIOS_DISABLECARD)
 529                         watchdog_stop();
 530
 531                 if (new_options & WDIOS_ENABLECARD)
 532                         return watchdog_start();
 533
 534
 535         case WDIOC_KEEPALIVE:
 536                 watchdog_keepalive();
 537                 return 0;
 538
 539         case WDIOC_SETTIMEOUT:
 540                 if (get_user(new_timeout, uarg.i))
 541                         return -EFAULT;
 542
 543                 if (watchdog_set_timeout(new_timeout))
 544                         return -EINVAL;
 545
 546                 watchdog_keepalive();
 547                 /* Fall */
 548
 549         case WDIOC_GETTIMEOUT:
 550                 return put_user(watchdog.timeout, uarg.i);
 551
 552         default:
 553                 return -ENOTTY;
 554
 555         }
 556 }
 557
 558 static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
 559         void *unused)
 560 {
 561         if (code == SYS_DOWN || code == SYS_HALT)
 562                 watchdog_stop();
 563         return NOTIFY_DONE;
 564 }
 565
 566 static const struct file_operations watchdog_fops = {
 567         .owner          = THIS_MODULE,
 568         .llseek         = no_llseek,
 569         .open           = watchdog_open,
 570         .release        = watchdog_release,
 571         .write          = watchdog_write,
 572         .unlocked_ioctl = watchdog_ioctl,
 573 };
 574
 575 static struct miscdevice watchdog_miscdev = {
 576         .minor          = WATCHDOG_MINOR,
 577         .name           = "watchdog",
 578         .fops           = &watchdog_fops,
 579 };
 580
 581 static struct notifier_block watchdog_notifier = {
 582         .notifier_call = watchdog_notify_sys,
 583 };
 584
 585 static int __init watchdog_init(int sioaddr)
 586 {
 587         int wdt_conf, err = 0;
 588
 589         /* No need to lock watchdog.lock here because no entry points
 590          * into the module have been registered yet.
 591          */
 592         watchdog.sioaddr = sioaddr;
 593         watchdog.ident.options = WDIOC_SETTIMEOUT
 594                                 | WDIOF_MAGICCLOSE
 595                                 | WDIOF_KEEPALIVEPING;
 596
 597         snprintf(watchdog.ident.identity,
 598                 sizeof(watchdog.ident.identity), "%s watchdog",
 599                 f71808e_names[watchdog.type]);
 600
 601         err = superio_enter(sioaddr);
 602         if (err)
 603                 return err;
 604         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 605
 606         wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
 607         watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS;
 608
 609         superio_exit(sioaddr);
 610
 611         err = watchdog_set_timeout(timeout);
 612         if (err)
 613                 return err;
 614         err = watchdog_set_pulse_width(pulse_width);
 615         if (err)
 616                 return err;
 617
 618         err = register_reboot_notifier(&watchdog_notifier);
 619         if (err)
 620                 return err;
 621
 622         err = misc_register(&watchdog_miscdev);
 623         if (err) {
 624                 printk(KERN_ERR DRVNAME
 625                         ": cannot register miscdev on minor=%d\n",
 626                                 watchdog_miscdev.minor);
 627                 goto exit_reboot;
 628         }
 629
 630         if (start_withtimeout) {
 631                 if (start_withtimeout <= 0
 632                  || start_withtimeout >  max_timeout) {
 633                         printk(KERN_ERR DRVNAME
 634                                 ": starting timeout out of range\n");
 635                         err = -EINVAL;
 636                         goto exit_miscdev;
 637                 }
 638
 639                 err = watchdog_start();
 640                 if (err) {
 641                         printk(KERN_ERR DRVNAME
 642                                 ": cannot start watchdog timer\n");
 643                         goto exit_miscdev;
 644                 }
 645
 646                 mutex_lock(&watchdog.lock);
 647                 err = superio_enter(sioaddr);
 648                 if (err)
 649                         goto exit_unlock;
 650                 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 651
 652                 if (start_withtimeout > 0xff) {
 653                         /* select minutes for timer units */
 654                         superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
 655                                 F71808FG_FLAG_WD_UNIT);
 656                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 657                                 DIV_ROUND_UP(start_withtimeout, 60));
 658                 } else {
 659                         /* select seconds for timer units */
 660                         superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
 661                                 F71808FG_FLAG_WD_UNIT);
 662                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 663                                 start_withtimeout);
 664                 }
 665
 666                 superio_exit(sioaddr);
 667                 mutex_unlock(&watchdog.lock);
 668
 669                 if (nowayout)
 670                         __module_get(THIS_MODULE);
 671
 672                 printk(KERN_INFO DRVNAME
 673                         ": watchdog started with initial timeout of %u sec\n",
 674                         start_withtimeout);
 675         }
 676
 677         return 0;
 678
 679 exit_unlock:
 680         mutex_unlock(&watchdog.lock);
 681 exit_miscdev:
 682         misc_deregister(&watchdog_miscdev);
 683 exit_reboot:
 684         unregister_reboot_notifier(&watchdog_notifier);
 685
 686         return err;
 687 }
 688
 689 static int __init f71808e_find(int sioaddr)
 690 {
 691         u16 devid;
 692         int err = superio_enter(sioaddr);
 693         if (err)
 694                 return err;
 695
 696         devid = superio_inw(sioaddr, SIO_REG_MANID);
 697         if (devid != SIO_FINTEK_ID) {
 698                 pr_debug(DRVNAME ": Not a Fintek device\n");
 699                 err = -ENODEV;
 700                 goto exit;
 701         }
 702
 703         devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
 704         switch (devid) {
 705         case SIO_F71808_ID:
 706                 watchdog.type = f71808fg;
 707                 break;
 708         case SIO_F71882_ID:
 709                 watchdog.type = f71882fg;
 710                 break;
 711         case SIO_F71862_ID:
 712         case SIO_F71889_ID:
 713                 /* These have a watchdog, though it isn't implemented (yet). */
 714                 err = -ENOSYS;
 715                 goto exit;
 716         case SIO_F71858_ID:
 717                 /* Confirmed (by datasheet) not to have a watchdog. */
 718                 err = -ENODEV;
 719                 goto exit;
 720         default:
 721                 printk(KERN_INFO DRVNAME ": Unrecognized Fintek device: %04x\n",
 722                        (unsigned int)devid);
 723                 err = -ENODEV;
 724                 goto exit;
 725         }
 726
 727         printk(KERN_INFO DRVNAME ": Found %s watchdog chip, revision %d\n",
 728                 f71808e_names[watchdog.type],
 729                 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
 730 exit:
 731         superio_exit(sioaddr);
 732         return err;
 733 }
 734
 735 static int __init f71808e_init(void)
 736 {
 737         static const unsigned short addrs[] = { 0x2e, 0x4e };
 738         int err = -ENODEV;
 739         int i;
 740
 741         for (i = 0; i < ARRAY_SIZE(addrs); i++) {
 742                 err = f71808e_find(addrs[i]);
 743                 if (err == 0)
 744                         break;
 745         }
 746         if (i == ARRAY_SIZE(addrs))
 747                 return err;
 748
 749         return watchdog_init(addrs[i]);
 750 }
 751
 752 static void __exit f71808e_exit(void)
 753 {
 754         if (watchdog_is_running()) {
 755                 printk(KERN_WARNING DRVNAME
 756                         ": Watchdog timer still running, stopping it\n");
 757                 watchdog_stop();
 758         }
 759         misc_deregister(&watchdog_miscdev);
 760         unregister_reboot_notifier(&watchdog_notifier);
 761 }
 762
 763 MODULE_DESCRIPTION("F71808E Watchdog Driver");
 764 MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
 765 MODULE_LICENSE("GPL");
 766
 767 module_init(f71808e_init);
 768 module_exit(f71808e_exit);