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_ROM_ADDR_SEL    0x27    /* ROM address select */
  46 #define SIO_REG_MFUNCT1         0x29    /* Multi function select 1 */
  47 #define SIO_REG_MFUNCT2         0x2a    /* Multi function select 2 */
  48 #define SIO_REG_MFUNCT3         0x2b    /* Multi function select 3 */
  49 #define SIO_REG_ENABLE          0x30    /* Logical device enable */
  50 #define SIO_REG_ADDR            0x60    /* Logical device address (2 bytes) */
  51
  52 #define SIO_FINTEK_ID           0x1934  /* Manufacturers ID */
  53 #define SIO_F71808_ID           0x0901  /* Chipset ID */
  54 #define SIO_F71858_ID           0x0507  /* Chipset ID */
  55 #define SIO_F71862_ID           0x0601  /* Chipset ID */
  56 #define SIO_F71882_ID           0x0541  /* Chipset ID */
  57 #define SIO_F71889_ID           0x0723  /* Chipset ID */
  58
  59 #define F71808FG_REG_WDO_CONF           0xf0
  60 #define F71808FG_REG_WDT_CONF           0xf5
  61 #define F71808FG_REG_WD_TIME            0xf6
  62
  63 #define F71808FG_FLAG_WDOUT_EN          7
  64
  65 #define F71808FG_FLAG_WDTMOUT_STS       5
  66 #define F71808FG_FLAG_WD_EN             5
  67 #define F71808FG_FLAG_WD_PULSE          4
  68 #define F71808FG_FLAG_WD_UNIT           3
  69
  70 /* Default values */
  71 #define WATCHDOG_TIMEOUT        60      /* 1 minute default timeout */
  72 #define WATCHDOG_MAX_TIMEOUT    (60 * 255)
  73 #define WATCHDOG_PULSE_WIDTH    125     /* 125 ms, default pulse width for
  74                                            watchdog signal */
  75 #define WATCHDOG_F71862FG_PIN   63      /* default watchdog reset output
  76                                            pin number 63 */
  77
  78 static unsigned short force_id;
  79 module_param(force_id, ushort, 0);
  80 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  81
  82 static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
  83 static int timeout = WATCHDOG_TIMEOUT;  /* default timeout in seconds */
  84 module_param(timeout, int, 0);
  85 MODULE_PARM_DESC(timeout,
  86         "Watchdog timeout in seconds. 1<= timeout <="
  87                         __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
  88                         __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
  89
  90 static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
  91 module_param(pulse_width, uint, 0);
  92 MODULE_PARM_DESC(pulse_width,
  93         "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
  94                         " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
  95
  96 static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
  97 module_param(f71862fg_pin, uint, 0);
  98 MODULE_PARM_DESC(f71862fg_pin,
  99         "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
 100                         " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
 101
 102 static int nowayout = WATCHDOG_NOWAYOUT;
 103 module_param(nowayout, bool, 0444);
 104 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
 105
 106 static unsigned int start_withtimeout;
 107 module_param(start_withtimeout, uint, 0);
 108 MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
 109         " given initial timeout. Zero (default) disables this feature.");
 110
 111 enum chips { f71808fg, f71858fg, f71862fg, f71882fg, f71889fg };
 112
 113 static const char *f71808e_names[] = {
 114         "f71808fg",
 115         "f71858fg",
 116         "f71862fg",
 117         "f71882fg",
 118         "f71889fg",
 119 };
 120
 121 /* Super-I/O Function prototypes */
 122 static inline int superio_inb(int base, int reg);
 123 static inline int superio_inw(int base, int reg);
 124 static inline void superio_outb(int base, int reg, u8 val);
 125 static inline void superio_set_bit(int base, int reg, int bit);
 126 static inline void superio_clear_bit(int base, int reg, int bit);
 127 static inline int superio_enter(int base);
 128 static inline void superio_select(int base, int ld);
 129 static inline void superio_exit(int base);
 130
 131 struct watchdog_data {
 132         unsigned short  sioaddr;
 133         enum chips      type;
 134         unsigned long   opened;
 135         struct mutex    lock;
 136         char            expect_close;
 137         struct watchdog_info ident;
 138
 139         unsigned short  timeout;
 140         u8              timer_val;      /* content for the wd_time register */
 141         char            minutes_mode;
 142         u8              pulse_val;      /* pulse width flag */
 143         char            pulse_mode;     /* enable pulse output mode? */
 144         char            caused_reboot;  /* last reboot was by the watchdog */
 145 };
 146
 147 static struct watchdog_data watchdog = {
 148         .lock = __MUTEX_INITIALIZER(watchdog.lock),
 149 };
 150
 151 /* Super I/O functions */
 152 static inline int superio_inb(int base, int reg)
 153 {
 154         outb(reg, base);
 155         return inb(base + 1);
 156 }
 157
 158 static int superio_inw(int base, int reg)
 159 {
 160         int val;
 161         val  = superio_inb(base, reg) << 8;
 162         val |= superio_inb(base, reg + 1);
 163         return val;
 164 }
 165
 166 static inline void superio_outb(int base, int reg, u8 val)
 167 {
 168         outb(reg, base);
 169         outb(val, base + 1);
 170 }
 171
 172 static inline void superio_set_bit(int base, int reg, int bit)
 173 {
 174         unsigned long val = superio_inb(base, reg);
 175         __set_bit(bit, &val);
 176         superio_outb(base, reg, val);
 177 }
 178
 179 static inline void superio_clear_bit(int base, int reg, int bit)
 180 {
 181         unsigned long val = superio_inb(base, reg);
 182         __clear_bit(bit, &val);
 183         superio_outb(base, reg, val);
 184 }
 185
 186 static inline int superio_enter(int base)
 187 {
 188         /* Don't step on other drivers' I/O space by accident */
 189         if (!request_muxed_region(base, 2, DRVNAME)) {
 190                 printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n",
 191                                 (int)base);
 192                 return -EBUSY;
 193         }
 194
 195         /* according to the datasheet the key must be send twice! */
 196         outb(SIO_UNLOCK_KEY, base);
 197         outb(SIO_UNLOCK_KEY, base);
 198
 199         return 0;
 200 }
 201
 202 static inline void superio_select(int base, int ld)
 203 {
 204         outb(SIO_REG_LDSEL, base);
 205         outb(ld, base + 1);
 206 }
 207
 208 static inline void superio_exit(int base)
 209 {
 210         outb(SIO_LOCK_KEY, base);
 211         release_region(base, 2);
 212 }
 213
 214 static int watchdog_set_timeout(int timeout)
 215 {
 216         if (timeout <= 0
 217          || timeout >  max_timeout) {
 218                 printk(KERN_ERR DRVNAME ": watchdog timeout out of range\n");
 219                 return -EINVAL;
 220         }
 221
 222         mutex_lock(&watchdog.lock);
 223
 224         watchdog.timeout = timeout;
 225         if (timeout > 0xff) {
 226                 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
 227                 watchdog.minutes_mode = true;
 228         } else {
 229                 watchdog.timer_val = timeout;
 230                 watchdog.minutes_mode = false;
 231         }
 232
 233         mutex_unlock(&watchdog.lock);
 234
 235         return 0;
 236 }
 237
 238 static int watchdog_set_pulse_width(unsigned int pw)
 239 {
 240         int err = 0;
 241
 242         mutex_lock(&watchdog.lock);
 243
 244         if        (pw <=    1) {
 245                 watchdog.pulse_val = 0;
 246         } else if (pw <=   25) {
 247                 watchdog.pulse_val = 1;
 248         } else if (pw <=  125) {
 249                 watchdog.pulse_val = 2;
 250         } else if (pw <= 5000) {
 251                 watchdog.pulse_val = 3;
 252         } else {
 253                 printk(KERN_ERR DRVNAME ": pulse width out of range\n");
 254                 err = -EINVAL;
 255                 goto exit_unlock;
 256         }
 257
 258         watchdog.pulse_mode = pw;
 259
 260 exit_unlock:
 261         mutex_unlock(&watchdog.lock);
 262         return err;
 263 }
 264
 265 static int watchdog_keepalive(void)
 266 {
 267         int err = 0;
 268
 269         mutex_lock(&watchdog.lock);
 270         err = superio_enter(watchdog.sioaddr);
 271         if (err)
 272                 goto exit_unlock;
 273         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 274
 275         if (watchdog.minutes_mode)
 276                 /* select minutes for timer units */
 277                 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 278                                 F71808FG_FLAG_WD_UNIT);
 279         else
 280                 /* select seconds for timer units */
 281                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 282                                 F71808FG_FLAG_WD_UNIT);
 283
 284         /* Set timer value */
 285         superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
 286                            watchdog.timer_val);
 287
 288         superio_exit(watchdog.sioaddr);
 289
 290 exit_unlock:
 291         mutex_unlock(&watchdog.lock);
 292         return err;
 293 }
 294
 295 static int f71862fg_pin_configure(unsigned short ioaddr)
 296 {
 297         /* When ioaddr is non-zero the calling function has to take care of
 298            mutex handling and superio preparation! */
 299
 300         if (f71862fg_pin == 63) {
 301                 if (ioaddr) {
 302                         /* SPI must be disabled first to use this pin! */
 303                         superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
 304                         superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
 305                 }
 306         } else if (f71862fg_pin == 56) {
 307                 if (ioaddr)
 308                         superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
 309         } else {
 310                 printk(KERN_ERR DRVNAME ": Invalid argument f71862fg_pin=%d\n",
 311                                 f71862fg_pin);
 312                 return -EINVAL;
 313         }
 314         return 0;
 315 }
 316
 317 static int watchdog_start(void)
 318 {
 319         /* Make sure we don't die as soon as the watchdog is enabled below */
 320         int err = watchdog_keepalive();
 321         if (err)
 322                 return err;
 323
 324         mutex_lock(&watchdog.lock);
 325         err = superio_enter(watchdog.sioaddr);
 326         if (err)
 327                 goto exit_unlock;
 328         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 329
 330         /* Watchdog pin configuration */
 331         switch (watchdog.type) {
 332         case f71808fg:
 333                 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
 334                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);
 335                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
 336                 break;
 337
 338         case f71862fg:
 339                 err = f71862fg_pin_configure(watchdog.sioaddr);
 340                 if (err)
 341                         goto exit_superio;
 342                 break;
 343
 344         case f71882fg:
 345                 /* Set pin 56 to WDTRST# */
 346                 superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
 347                 break;
 348
 349         case f71889fg:
 350                 /* set pin 40 to WDTRST# */
 351                 superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,
 352                         superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
 353                 break;
 354
 355         default:
 356                 /*
 357                  * 'default' label to shut up the compiler and catch
 358                  * programmer errors
 359                  */
 360                 err = -ENODEV;
 361                 goto exit_superio;
 362         }
 363
 364         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 365         superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
 366         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
 367                         F71808FG_FLAG_WDOUT_EN);
 368
 369         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 370                         F71808FG_FLAG_WD_EN);
 371
 372         if (watchdog.pulse_mode) {
 373                 /* Select "pulse" output mode with given duration */
 374                 u8 wdt_conf = superio_inb(watchdog.sioaddr,
 375                                 F71808FG_REG_WDT_CONF);
 376
 377                 /* Set WD_PSWIDTH bits (1:0) */
 378                 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
 379                 /* Set WD_PULSE to "pulse" mode */
 380                 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
 381
 382                 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 383                                 wdt_conf);
 384         } else {
 385                 /* Select "level" output mode */
 386                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 387                                 F71808FG_FLAG_WD_PULSE);
 388         }
 389
 390 exit_superio:
 391         superio_exit(watchdog.sioaddr);
 392 exit_unlock:
 393         mutex_unlock(&watchdog.lock);
 394
 395         return err;
 396 }
 397
 398 static int watchdog_stop(void)
 399 {
 400         int err = 0;
 401
 402         mutex_lock(&watchdog.lock);
 403         err = superio_enter(watchdog.sioaddr);
 404         if (err)
 405                 goto exit_unlock;
 406         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 407
 408         superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 409                         F71808FG_FLAG_WD_EN);
 410
 411         superio_exit(watchdog.sioaddr);
 412
 413 exit_unlock:
 414         mutex_unlock(&watchdog.lock);
 415
 416         return err;
 417 }
 418
 419 static int watchdog_get_status(void)
 420 {
 421         int status = 0;
 422
 423         mutex_lock(&watchdog.lock);
 424         status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
 425         mutex_unlock(&watchdog.lock);
 426
 427         return status;
 428 }
 429
 430 static bool watchdog_is_running(void)
 431 {
 432         /*
 433          * if we fail to determine the watchdog's status assume it to be
 434          * running to be on the safe side
 435          */
 436         bool is_running = true;
 437
 438         mutex_lock(&watchdog.lock);
 439         if (superio_enter(watchdog.sioaddr))
 440                 goto exit_unlock;
 441         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 442
 443         is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
 444                 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
 445                         & F71808FG_FLAG_WD_EN);
 446
 447         superio_exit(watchdog.sioaddr);
 448
 449 exit_unlock:
 450         mutex_unlock(&watchdog.lock);
 451         return is_running;
 452 }
 453
 454 /* /dev/watchdog api */
 455
 456 static int watchdog_open(struct inode *inode, struct file *file)
 457 {
 458         int err;
 459
 460         /* If the watchdog is alive we don't need to start it again */
 461         if (test_and_set_bit(0, &watchdog.opened))
 462                 return -EBUSY;
 463
 464         err = watchdog_start();
 465         if (err) {
 466                 clear_bit(0, &watchdog.opened);
 467                 return err;
 468         }
 469
 470         if (nowayout)
 471                 __module_get(THIS_MODULE);
 472
 473         watchdog.expect_close = 0;
 474         return nonseekable_open(inode, file);
 475 }
 476
 477 static int watchdog_release(struct inode *inode, struct file *file)
 478 {
 479         clear_bit(0, &watchdog.opened);
 480
 481         if (!watchdog.expect_close) {
 482                 watchdog_keepalive();
 483                 printk(KERN_CRIT DRVNAME
 484                         ": Unexpected close, not stopping watchdog!\n");
 485         } else if (!nowayout) {
 486                 watchdog_stop();
 487         }
 488         return 0;
 489 }
 490
 491 /*
 492  *      watchdog_write:
 493  *      @file: file handle to the watchdog
 494  *      @buf: buffer to write
 495  *      @count: count of bytes
 496  *      @ppos: pointer to the position to write. No seeks allowed
 497  *
 498  *      A write to a watchdog device is defined as a keepalive signal. Any
 499  *      write of data will do, as we we don't define content meaning.
 500  */
 501
 502 static ssize_t watchdog_write(struct file *file, const char __user *buf,
 503                             size_t count, loff_t *ppos)
 504 {
 505         if (count) {
 506                 if (!nowayout) {
 507                         size_t i;
 508
 509                         /* In case it was set long ago */
 510                         bool expect_close = false;
 511
 512                         for (i = 0; i != count; i++) {
 513                                 char c;
 514                                 if (get_user(c, buf + i))
 515                                         return -EFAULT;
 516                                 expect_close = (c == 'V');
 517                         }
 518
 519                         /* Properly order writes across fork()ed processes */
 520                         mutex_lock(&watchdog.lock);
 521                         watchdog.expect_close = expect_close;
 522                         mutex_unlock(&watchdog.lock);
 523                 }
 524
 525                 /* someone wrote to us, we should restart timer */
 526                 watchdog_keepalive();
 527         }
 528         return count;
 529 }
 530
 531 /*
 532  *      watchdog_ioctl:
 533  *      @inode: inode of the device
 534  *      @file: file handle to the device
 535  *      @cmd: watchdog command
 536  *      @arg: argument pointer
 537  *
 538  *      The watchdog API defines a common set of functions for all watchdogs
 539  *      according to their available features.
 540  */
 541 static long watchdog_ioctl(struct file *file, unsigned int cmd,
 542         unsigned long arg)
 543 {
 544         int status;
 545         int new_options;
 546         int new_timeout;
 547         union {
 548                 struct watchdog_info __user *ident;
 549                 int __user *i;
 550         } uarg;
 551
 552         uarg.i = (int __user *)arg;
 553
 554         switch (cmd) {
 555         case WDIOC_GETSUPPORT:
 556                 return copy_to_user(uarg.ident, &watchdog.ident,
 557                         sizeof(watchdog.ident)) ? -EFAULT : 0;
 558
 559         case WDIOC_GETSTATUS:
 560                 status = watchdog_get_status();
 561                 if (status < 0)
 562                         return status;
 563                 return put_user(status, uarg.i);
 564
 565         case WDIOC_GETBOOTSTATUS:
 566                 return put_user(0, uarg.i);
 567
 568         case WDIOC_SETOPTIONS:
 569                 if (get_user(new_options, uarg.i))
 570                         return -EFAULT;
 571
 572                 if (new_options & WDIOS_DISABLECARD)
 573                         watchdog_stop();
 574
 575                 if (new_options & WDIOS_ENABLECARD)
 576                         return watchdog_start();
 577
 578
 579         case WDIOC_KEEPALIVE:
 580                 watchdog_keepalive();
 581                 return 0;
 582
 583         case WDIOC_SETTIMEOUT:
 584                 if (get_user(new_timeout, uarg.i))
 585                         return -EFAULT;
 586
 587                 if (watchdog_set_timeout(new_timeout))
 588                         return -EINVAL;
 589
 590                 watchdog_keepalive();
 591                 /* Fall */
 592
 593         case WDIOC_GETTIMEOUT:
 594                 return put_user(watchdog.timeout, uarg.i);
 595
 596         default:
 597                 return -ENOTTY;
 598
 599         }
 600 }
 601
 602 static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
 603         void *unused)
 604 {
 605         if (code == SYS_DOWN || code == SYS_HALT)
 606                 watchdog_stop();
 607         return NOTIFY_DONE;
 608 }
 609
 610 static const struct file_operations watchdog_fops = {
 611         .owner          = THIS_MODULE,
 612         .llseek         = no_llseek,
 613         .open           = watchdog_open,
 614         .release        = watchdog_release,
 615         .write          = watchdog_write,
 616         .unlocked_ioctl = watchdog_ioctl,
 617 };
 618
 619 static struct miscdevice watchdog_miscdev = {
 620         .minor          = WATCHDOG_MINOR,
 621         .name           = "watchdog",
 622         .fops           = &watchdog_fops,
 623 };
 624
 625 static struct notifier_block watchdog_notifier = {
 626         .notifier_call = watchdog_notify_sys,
 627 };
 628
 629 static int __init watchdog_init(int sioaddr)
 630 {
 631         int wdt_conf, err = 0;
 632
 633         /* No need to lock watchdog.lock here because no entry points
 634          * into the module have been registered yet.
 635          */
 636         watchdog.sioaddr = sioaddr;
 637         watchdog.ident.options = WDIOC_SETTIMEOUT
 638                                 | WDIOF_MAGICCLOSE
 639                                 | WDIOF_KEEPALIVEPING;
 640
 641         snprintf(watchdog.ident.identity,
 642                 sizeof(watchdog.ident.identity), "%s watchdog",
 643                 f71808e_names[watchdog.type]);
 644
 645         err = superio_enter(sioaddr);
 646         if (err)
 647                 return err;
 648         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 649
 650         wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
 651         watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS;
 652
 653         superio_exit(sioaddr);
 654
 655         err = watchdog_set_timeout(timeout);
 656         if (err)
 657                 return err;
 658         err = watchdog_set_pulse_width(pulse_width);
 659         if (err)
 660                 return err;
 661
 662         err = register_reboot_notifier(&watchdog_notifier);
 663         if (err)
 664                 return err;
 665
 666         err = misc_register(&watchdog_miscdev);
 667         if (err) {
 668                 printk(KERN_ERR DRVNAME
 669                         ": cannot register miscdev on minor=%d\n",
 670                                 watchdog_miscdev.minor);
 671                 goto exit_reboot;
 672         }
 673
 674         if (start_withtimeout) {
 675                 if (start_withtimeout <= 0
 676                  || start_withtimeout >  max_timeout) {
 677                         printk(KERN_ERR DRVNAME
 678                                 ": starting timeout out of range\n");
 679                         err = -EINVAL;
 680                         goto exit_miscdev;
 681                 }
 682
 683                 err = watchdog_start();
 684                 if (err) {
 685                         printk(KERN_ERR DRVNAME
 686                                 ": cannot start watchdog timer\n");
 687                         goto exit_miscdev;
 688                 }
 689
 690                 mutex_lock(&watchdog.lock);
 691                 err = superio_enter(sioaddr);
 692                 if (err)
 693                         goto exit_unlock;
 694                 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 695
 696                 if (start_withtimeout > 0xff) {
 697                         /* select minutes for timer units */
 698                         superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
 699                                 F71808FG_FLAG_WD_UNIT);
 700                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 701                                 DIV_ROUND_UP(start_withtimeout, 60));
 702                 } else {
 703                         /* select seconds for timer units */
 704                         superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
 705                                 F71808FG_FLAG_WD_UNIT);
 706                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 707                                 start_withtimeout);
 708                 }
 709
 710                 superio_exit(sioaddr);
 711                 mutex_unlock(&watchdog.lock);
 712
 713                 if (nowayout)
 714                         __module_get(THIS_MODULE);
 715
 716                 printk(KERN_INFO DRVNAME
 717                         ": watchdog started with initial timeout of %u sec\n",
 718                         start_withtimeout);
 719         }
 720
 721         return 0;
 722
 723 exit_unlock:
 724         mutex_unlock(&watchdog.lock);
 725 exit_miscdev:
 726         misc_deregister(&watchdog_miscdev);
 727 exit_reboot:
 728         unregister_reboot_notifier(&watchdog_notifier);
 729
 730         return err;
 731 }
 732
 733 static int __init f71808e_find(int sioaddr)
 734 {
 735         u16 devid;
 736         int err = superio_enter(sioaddr);
 737         if (err)
 738                 return err;
 739
 740         devid = superio_inw(sioaddr, SIO_REG_MANID);
 741         if (devid != SIO_FINTEK_ID) {
 742                 pr_debug(DRVNAME ": Not a Fintek device\n");
 743                 err = -ENODEV;
 744                 goto exit;
 745         }
 746
 747         devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
 748         switch (devid) {
 749         case SIO_F71808_ID:
 750                 watchdog.type = f71808fg;
 751                 break;
 752         case SIO_F71862_ID:
 753                 watchdog.type = f71862fg;
 754                 err = f71862fg_pin_configure(0); /* validate module parameter */
 755                 break;
 756         case SIO_F71882_ID:
 757                 watchdog.type = f71882fg;
 758                 break;
 759         case SIO_F71889_ID:
 760                 watchdog.type = f71889fg;
 761                 break;
 762         case SIO_F71858_ID:
 763                 /* Confirmed (by datasheet) not to have a watchdog. */
 764                 err = -ENODEV;
 765                 goto exit;
 766         default:
 767                 printk(KERN_INFO DRVNAME ": Unrecognized Fintek device: %04x\n",
 768                        (unsigned int)devid);
 769                 err = -ENODEV;
 770                 goto exit;
 771         }
 772
 773         printk(KERN_INFO DRVNAME ": Found %s watchdog chip, revision %d\n",
 774                 f71808e_names[watchdog.type],
 775                 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
 776 exit:
 777         superio_exit(sioaddr);
 778         return err;
 779 }
 780
 781 static int __init f71808e_init(void)
 782 {
 783         static const unsigned short addrs[] = { 0x2e, 0x4e };
 784         int err = -ENODEV;
 785         int i;
 786
 787         for (i = 0; i < ARRAY_SIZE(addrs); i++) {
 788                 err = f71808e_find(addrs[i]);
 789                 if (err == 0)
 790                         break;
 791         }
 792         if (i == ARRAY_SIZE(addrs))
 793                 return err;
 794
 795         return watchdog_init(addrs[i]);
 796 }
 797
 798 static void __exit f71808e_exit(void)
 799 {
 800         if (watchdog_is_running()) {
 801                 printk(KERN_WARNING DRVNAME
 802                         ": Watchdog timer still running, stopping it\n");
 803                 watchdog_stop();
 804         }
 805         misc_deregister(&watchdog_miscdev);
 806         unregister_reboot_notifier(&watchdog_notifier);
 807 }
 808
 809 MODULE_DESCRIPTION("F71808E Watchdog Driver");
 810 MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
 811 MODULE_LICENSE("GPL");
 812
 813 module_init(f71808e_init);
 814 module_exit(f71808e_exit);