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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  23
  24 #include <linux/err.h>
  25 #include <linux/fs.h>
  26 #include <linux/init.h>
  27 #include <linux/io.h>
  28 #include <linux/ioport.h>
  29 #include <linux/miscdevice.h>
  30 #include <linux/module.h>
  31 #include <linux/mutex.h>
  32 #include <linux/notifier.h>
  33 #include <linux/reboot.h>
  34 #include <linux/uaccess.h>
  35 #include <linux/watchdog.h>
  36
  37 #define DRVNAME "f71808e_wdt"
  38
  39 #define SIO_F71808FG_LD_WDT     0x07    /* Watchdog timer logical device */
  40 #define SIO_UNLOCK_KEY          0x87    /* Key to enable Super-I/O */
  41 #define SIO_LOCK_KEY            0xAA    /* Key to diasble Super-I/O */
  42
  43 #define SIO_REG_LDSEL           0x07    /* Logical device select */
  44 #define SIO_REG_DEVID           0x20    /* Device ID (2 bytes) */
  45 #define SIO_REG_DEVREV          0x22    /* Device revision */
  46 #define SIO_REG_MANID           0x23    /* Fintek ID (2 bytes) */
  47 #define SIO_REG_ROM_ADDR_SEL    0x27    /* ROM address select */
  48 #define SIO_REG_MFUNCT1         0x29    /* Multi function select 1 */
  49 #define SIO_REG_MFUNCT2         0x2a    /* Multi function select 2 */
  50 #define SIO_REG_MFUNCT3         0x2b    /* Multi function select 3 */
  51 #define SIO_REG_ENABLE          0x30    /* Logical device enable */
  52 #define SIO_REG_ADDR            0x60    /* Logical device address (2 bytes) */
  53
  54 #define SIO_FINTEK_ID           0x1934  /* Manufacturers ID */
  55 #define SIO_F71808_ID           0x0901  /* Chipset ID */
  56 #define SIO_F71858_ID           0x0507  /* Chipset ID */
  57 #define SIO_F71862_ID           0x0601  /* Chipset ID */
  58 #define SIO_F71869_ID           0x0814  /* Chipset ID */
  59 #define SIO_F71869A_ID          0x1007  /* Chipset ID */
  60 #define SIO_F71882_ID           0x0541  /* Chipset ID */
  61 #define SIO_F71889_ID           0x0723  /* Chipset ID */
  62
  63 #define F71808FG_REG_WDO_CONF           0xf0
  64 #define F71808FG_REG_WDT_CONF           0xf5
  65 #define F71808FG_REG_WD_TIME            0xf6
  66
  67 #define F71808FG_FLAG_WDOUT_EN          7
  68
  69 #define F71808FG_FLAG_WDTMOUT_STS       5
  70 #define F71808FG_FLAG_WD_EN             5
  71 #define F71808FG_FLAG_WD_PULSE          4
  72 #define F71808FG_FLAG_WD_UNIT           3
  73
  74 /* Default values */
  75 #define WATCHDOG_TIMEOUT        60      /* 1 minute default timeout */
  76 #define WATCHDOG_MAX_TIMEOUT    (60 * 255)
  77 #define WATCHDOG_PULSE_WIDTH    125     /* 125 ms, default pulse width for
  78                                            watchdog signal */
  79 #define WATCHDOG_F71862FG_PIN   63      /* default watchdog reset output
  80                                            pin number 63 */
  81
  82 static unsigned short force_id;
  83 module_param(force_id, ushort, 0);
  84 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  85
  86 static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
  87 static int timeout = WATCHDOG_TIMEOUT;  /* default timeout in seconds */
  88 module_param(timeout, int, 0);
  89 MODULE_PARM_DESC(timeout,
  90         "Watchdog timeout in seconds. 1<= timeout <="
  91                         __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
  92                         __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
  93
  94 static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
  95 module_param(pulse_width, uint, 0);
  96 MODULE_PARM_DESC(pulse_width,
  97         "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
  98                         " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
  99
 100 static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
 101 module_param(f71862fg_pin, uint, 0);
 102 MODULE_PARM_DESC(f71862fg_pin,
 103         "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
 104                         " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
 105
 106 static bool nowayout = WATCHDOG_NOWAYOUT;
 107 module_param(nowayout, bool, 0444);
 108 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
 109
 110 static unsigned int start_withtimeout;
 111 module_param(start_withtimeout, uint, 0);
 112 MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
 113         " given initial timeout. Zero (default) disables this feature.");
 114
 115 enum chips { f71808fg, f71858fg, f71862fg, f71869, f71882fg, f71889fg };
 116
 117 static const char *f71808e_names[] = {
 118         "f71808fg",
 119         "f71858fg",
 120         "f71862fg",
 121         "f71869",
 122         "f71882fg",
 123         "f71889fg",
 124 };
 125
 126 /* Super-I/O Function prototypes */
 127 static inline int superio_inb(int base, int reg);
 128 static inline int superio_inw(int base, int reg);
 129 static inline void superio_outb(int base, int reg, u8 val);
 130 static inline void superio_set_bit(int base, int reg, int bit);
 131 static inline void superio_clear_bit(int base, int reg, int bit);
 132 static inline int superio_enter(int base);
 133 static inline void superio_select(int base, int ld);
 134 static inline void superio_exit(int base);
 135
 136 struct watchdog_data {
 137         unsigned short  sioaddr;
 138         enum chips      type;
 139         unsigned long   opened;
 140         struct mutex    lock;
 141         char            expect_close;
 142         struct watchdog_info ident;
 143
 144         unsigned short  timeout;
 145         u8              timer_val;      /* content for the wd_time register */
 146         char            minutes_mode;
 147         u8              pulse_val;      /* pulse width flag */
 148         char            pulse_mode;     /* enable pulse output mode? */
 149         char            caused_reboot;  /* last reboot was by the watchdog */
 150 };
 151
 152 static struct watchdog_data watchdog = {
 153         .lock = __MUTEX_INITIALIZER(watchdog.lock),
 154 };
 155
 156 /* Super I/O functions */
 157 static inline int superio_inb(int base, int reg)
 158 {
 159         outb(reg, base);
 160         return inb(base + 1);
 161 }
 162
 163 static int superio_inw(int base, int reg)
 164 {
 165         int val;
 166         val  = superio_inb(base, reg) << 8;
 167         val |= superio_inb(base, reg + 1);
 168         return val;
 169 }
 170
 171 static inline void superio_outb(int base, int reg, u8 val)
 172 {
 173         outb(reg, base);
 174         outb(val, base + 1);
 175 }
 176
 177 static inline void superio_set_bit(int base, int reg, int bit)
 178 {
 179         unsigned long val = superio_inb(base, reg);
 180         __set_bit(bit, &val);
 181         superio_outb(base, reg, val);
 182 }
 183
 184 static inline void superio_clear_bit(int base, int reg, int bit)
 185 {
 186         unsigned long val = superio_inb(base, reg);
 187         __clear_bit(bit, &val);
 188         superio_outb(base, reg, val);
 189 }
 190
 191 static inline int superio_enter(int base)
 192 {
 193         /* Don't step on other drivers' I/O space by accident */
 194         if (!request_muxed_region(base, 2, DRVNAME)) {
 195                 pr_err("I/O address 0x%04x already in use\n", (int)base);
 196                 return -EBUSY;
 197         }
 198
 199         /* according to the datasheet the key must be sent twice! */
 200         outb(SIO_UNLOCK_KEY, base);
 201         outb(SIO_UNLOCK_KEY, base);
 202
 203         return 0;
 204 }
 205
 206 static inline void superio_select(int base, int ld)
 207 {
 208         outb(SIO_REG_LDSEL, base);
 209         outb(ld, base + 1);
 210 }
 211
 212 static inline void superio_exit(int base)
 213 {
 214         outb(SIO_LOCK_KEY, base);
 215         release_region(base, 2);
 216 }
 217
 218 static int watchdog_set_timeout(int timeout)
 219 {
 220         if (timeout <= 0
 221          || timeout >  max_timeout) {
 222                 pr_err("watchdog timeout out of range\n");
 223                 return -EINVAL;
 224         }
 225
 226         mutex_lock(&watchdog.lock);
 227
 228         watchdog.timeout = timeout;
 229         if (timeout > 0xff) {
 230                 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
 231                 watchdog.minutes_mode = true;
 232         } else {
 233                 watchdog.timer_val = timeout;
 234                 watchdog.minutes_mode = false;
 235         }
 236
 237         mutex_unlock(&watchdog.lock);
 238
 239         return 0;
 240 }
 241
 242 static int watchdog_set_pulse_width(unsigned int pw)
 243 {
 244         int err = 0;
 245
 246         mutex_lock(&watchdog.lock);
 247
 248         if        (pw <=    1) {
 249                 watchdog.pulse_val = 0;
 250         } else if (pw <=   25) {
 251                 watchdog.pulse_val = 1;
 252         } else if (pw <=  125) {
 253                 watchdog.pulse_val = 2;
 254         } else if (pw <= 5000) {
 255                 watchdog.pulse_val = 3;
 256         } else {
 257                 pr_err("pulse width out of range\n");
 258                 err = -EINVAL;
 259                 goto exit_unlock;
 260         }
 261
 262         watchdog.pulse_mode = pw;
 263
 264 exit_unlock:
 265         mutex_unlock(&watchdog.lock);
 266         return err;
 267 }
 268
 269 static int watchdog_keepalive(void)
 270 {
 271         int err = 0;
 272
 273         mutex_lock(&watchdog.lock);
 274         err = superio_enter(watchdog.sioaddr);
 275         if (err)
 276                 goto exit_unlock;
 277         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 278
 279         if (watchdog.minutes_mode)
 280                 /* select minutes for timer units */
 281                 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 282                                 F71808FG_FLAG_WD_UNIT);
 283         else
 284                 /* select seconds for timer units */
 285                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 286                                 F71808FG_FLAG_WD_UNIT);
 287
 288         /* Set timer value */
 289         superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
 290                            watchdog.timer_val);
 291
 292         superio_exit(watchdog.sioaddr);
 293
 294 exit_unlock:
 295         mutex_unlock(&watchdog.lock);
 296         return err;
 297 }
 298
 299 static int f71862fg_pin_configure(unsigned short ioaddr)
 300 {
 301         /* When ioaddr is non-zero the calling function has to take care of
 302            mutex handling and superio preparation! */
 303
 304         if (f71862fg_pin == 63) {
 305                 if (ioaddr) {
 306                         /* SPI must be disabled first to use this pin! */
 307                         superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
 308                         superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
 309                 }
 310         } else if (f71862fg_pin == 56) {
 311                 if (ioaddr)
 312                         superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
 313         } else {
 314                 pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin);
 315                 return -EINVAL;
 316         }
 317         return 0;
 318 }
 319
 320 static int watchdog_start(void)
 321 {
 322         /* Make sure we don't die as soon as the watchdog is enabled below */
 323         int err = watchdog_keepalive();
 324         if (err)
 325                 return err;
 326
 327         mutex_lock(&watchdog.lock);
 328         err = superio_enter(watchdog.sioaddr);
 329         if (err)
 330                 goto exit_unlock;
 331         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 332
 333         /* Watchdog pin configuration */
 334         switch (watchdog.type) {
 335         case f71808fg:
 336                 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
 337                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);
 338                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
 339                 break;
 340
 341         case f71862fg:
 342                 err = f71862fg_pin_configure(watchdog.sioaddr);
 343                 if (err)
 344                         goto exit_superio;
 345                 break;
 346
 347         case f71869:
 348                 /* GPIO14 --> WDTRST# */
 349                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4);
 350                 break;
 351
 352         case f71882fg:
 353                 /* Set pin 56 to WDTRST# */
 354                 superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
 355                 break;
 356
 357         case f71889fg:
 358                 /* set pin 40 to WDTRST# */
 359                 superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,
 360                         superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
 361                 break;
 362
 363         default:
 364                 /*
 365                  * 'default' label to shut up the compiler and catch
 366                  * programmer errors
 367                  */
 368                 err = -ENODEV;
 369                 goto exit_superio;
 370         }
 371
 372         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 373         superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
 374         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
 375                         F71808FG_FLAG_WDOUT_EN);
 376
 377         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 378                         F71808FG_FLAG_WD_EN);
 379
 380         if (watchdog.pulse_mode) {
 381                 /* Select "pulse" output mode with given duration */
 382                 u8 wdt_conf = superio_inb(watchdog.sioaddr,
 383                                 F71808FG_REG_WDT_CONF);
 384
 385                 /* Set WD_PSWIDTH bits (1:0) */
 386                 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
 387                 /* Set WD_PULSE to "pulse" mode */
 388                 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
 389
 390                 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 391                                 wdt_conf);
 392         } else {
 393                 /* Select "level" output mode */
 394                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 395                                 F71808FG_FLAG_WD_PULSE);
 396         }
 397
 398 exit_superio:
 399         superio_exit(watchdog.sioaddr);
 400 exit_unlock:
 401         mutex_unlock(&watchdog.lock);
 402
 403         return err;
 404 }
 405
 406 static int watchdog_stop(void)
 407 {
 408         int err = 0;
 409
 410         mutex_lock(&watchdog.lock);
 411         err = superio_enter(watchdog.sioaddr);
 412         if (err)
 413                 goto exit_unlock;
 414         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 415
 416         superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 417                         F71808FG_FLAG_WD_EN);
 418
 419         superio_exit(watchdog.sioaddr);
 420
 421 exit_unlock:
 422         mutex_unlock(&watchdog.lock);
 423
 424         return err;
 425 }
 426
 427 static int watchdog_get_status(void)
 428 {
 429         int status = 0;
 430
 431         mutex_lock(&watchdog.lock);
 432         status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
 433         mutex_unlock(&watchdog.lock);
 434
 435         return status;
 436 }
 437
 438 static bool watchdog_is_running(void)
 439 {
 440         /*
 441          * if we fail to determine the watchdog's status assume it to be
 442          * running to be on the safe side
 443          */
 444         bool is_running = true;
 445
 446         mutex_lock(&watchdog.lock);
 447         if (superio_enter(watchdog.sioaddr))
 448                 goto exit_unlock;
 449         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 450
 451         is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
 452                 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
 453                         & F71808FG_FLAG_WD_EN);
 454
 455         superio_exit(watchdog.sioaddr);
 456
 457 exit_unlock:
 458         mutex_unlock(&watchdog.lock);
 459         return is_running;
 460 }
 461
 462 /* /dev/watchdog api */
 463
 464 static int watchdog_open(struct inode *inode, struct file *file)
 465 {
 466         int err;
 467
 468         /* If the watchdog is alive we don't need to start it again */
 469         if (test_and_set_bit(0, &watchdog.opened))
 470                 return -EBUSY;
 471
 472         err = watchdog_start();
 473         if (err) {
 474                 clear_bit(0, &watchdog.opened);
 475                 return err;
 476         }
 477
 478         if (nowayout)
 479                 __module_get(THIS_MODULE);
 480
 481         watchdog.expect_close = 0;
 482         return nonseekable_open(inode, file);
 483 }
 484
 485 static int watchdog_release(struct inode *inode, struct file *file)
 486 {
 487         clear_bit(0, &watchdog.opened);
 488
 489         if (!watchdog.expect_close) {
 490                 watchdog_keepalive();
 491                 pr_crit("Unexpected close, not stopping watchdog!\n");
 492         } else if (!nowayout) {
 493                 watchdog_stop();
 494         }
 495         return 0;
 496 }
 497
 498 /*
 499  *      watchdog_write:
 500  *      @file: file handle to the watchdog
 501  *      @buf: buffer to write
 502  *      @count: count of bytes
 503  *      @ppos: pointer to the position to write. No seeks allowed
 504  *
 505  *      A write to a watchdog device is defined as a keepalive signal. Any
 506  *      write of data will do, as we we don't define content meaning.
 507  */
 508
 509 static ssize_t watchdog_write(struct file *file, const char __user *buf,
 510                             size_t count, loff_t *ppos)
 511 {
 512         if (count) {
 513                 if (!nowayout) {
 514                         size_t i;
 515
 516                         /* In case it was set long ago */
 517                         bool expect_close = false;
 518
 519                         for (i = 0; i != count; i++) {
 520                                 char c;
 521                                 if (get_user(c, buf + i))
 522                                         return -EFAULT;
 523                                 expect_close = (c == 'V');
 524                         }
 525
 526                         /* Properly order writes across fork()ed processes */
 527                         mutex_lock(&watchdog.lock);
 528                         watchdog.expect_close = expect_close;
 529                         mutex_unlock(&watchdog.lock);
 530                 }
 531
 532                 /* someone wrote to us, we should restart timer */
 533                 watchdog_keepalive();
 534         }
 535         return count;
 536 }
 537
 538 /*
 539  *      watchdog_ioctl:
 540  *      @inode: inode of the device
 541  *      @file: file handle to the device
 542  *      @cmd: watchdog command
 543  *      @arg: argument pointer
 544  *
 545  *      The watchdog API defines a common set of functions for all watchdogs
 546  *      according to their available features.
 547  */
 548 static long watchdog_ioctl(struct file *file, unsigned int cmd,
 549         unsigned long arg)
 550 {
 551         int status;
 552         int new_options;
 553         int new_timeout;
 554         union {
 555                 struct watchdog_info __user *ident;
 556                 int __user *i;
 557         } uarg;
 558
 559         uarg.i = (int __user *)arg;
 560
 561         switch (cmd) {
 562         case WDIOC_GETSUPPORT:
 563                 return copy_to_user(uarg.ident, &watchdog.ident,
 564                         sizeof(watchdog.ident)) ? -EFAULT : 0;
 565
 566         case WDIOC_GETSTATUS:
 567                 status = watchdog_get_status();
 568                 if (status < 0)
 569                         return status;
 570                 return put_user(status, uarg.i);
 571
 572         case WDIOC_GETBOOTSTATUS:
 573                 return put_user(0, uarg.i);
 574
 575         case WDIOC_SETOPTIONS:
 576                 if (get_user(new_options, uarg.i))
 577                         return -EFAULT;
 578
 579                 if (new_options & WDIOS_DISABLECARD)
 580                         watchdog_stop();
 581
 582                 if (new_options & WDIOS_ENABLECARD)
 583                         return watchdog_start();
 584
 585
 586         case WDIOC_KEEPALIVE:
 587                 watchdog_keepalive();
 588                 return 0;
 589
 590         case WDIOC_SETTIMEOUT:
 591                 if (get_user(new_timeout, uarg.i))
 592                         return -EFAULT;
 593
 594                 if (watchdog_set_timeout(new_timeout))
 595                         return -EINVAL;
 596
 597                 watchdog_keepalive();
 598                 /* Fall */
 599
 600         case WDIOC_GETTIMEOUT:
 601                 return put_user(watchdog.timeout, uarg.i);
 602
 603         default:
 604                 return -ENOTTY;
 605
 606         }
 607 }
 608
 609 static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
 610         void *unused)
 611 {
 612         if (code == SYS_DOWN || code == SYS_HALT)
 613                 watchdog_stop();
 614         return NOTIFY_DONE;
 615 }
 616
 617 static const struct file_operations watchdog_fops = {
 618         .owner          = THIS_MODULE,
 619         .llseek         = no_llseek,
 620         .open           = watchdog_open,
 621         .release        = watchdog_release,
 622         .write          = watchdog_write,
 623         .unlocked_ioctl = watchdog_ioctl,
 624 };
 625
 626 static struct miscdevice watchdog_miscdev = {
 627         .minor          = WATCHDOG_MINOR,
 628         .name           = "watchdog",
 629         .fops           = &watchdog_fops,
 630 };
 631
 632 static struct notifier_block watchdog_notifier = {
 633         .notifier_call = watchdog_notify_sys,
 634 };
 635
 636 static int __init watchdog_init(int sioaddr)
 637 {
 638         int wdt_conf, err = 0;
 639
 640         /* No need to lock watchdog.lock here because no entry points
 641          * into the module have been registered yet.
 642          */
 643         watchdog.sioaddr = sioaddr;
 644         watchdog.ident.options = WDIOC_SETTIMEOUT
 645                                 | WDIOF_MAGICCLOSE
 646                                 | WDIOF_KEEPALIVEPING;
 647
 648         snprintf(watchdog.ident.identity,
 649                 sizeof(watchdog.ident.identity), "%s watchdog",
 650                 f71808e_names[watchdog.type]);
 651
 652         err = superio_enter(sioaddr);
 653         if (err)
 654                 return err;
 655         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 656
 657         wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
 658         watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS;
 659
 660         superio_exit(sioaddr);
 661
 662         err = watchdog_set_timeout(timeout);
 663         if (err)
 664                 return err;
 665         err = watchdog_set_pulse_width(pulse_width);
 666         if (err)
 667                 return err;
 668
 669         err = register_reboot_notifier(&watchdog_notifier);
 670         if (err)
 671                 return err;
 672
 673         err = misc_register(&watchdog_miscdev);
 674         if (err) {
 675                 pr_err("cannot register miscdev on minor=%d\n",
 676                        watchdog_miscdev.minor);
 677                 goto exit_reboot;
 678         }
 679
 680         if (start_withtimeout) {
 681                 if (start_withtimeout <= 0
 682                  || start_withtimeout >  max_timeout) {
 683                         pr_err("starting timeout out of range\n");
 684                         err = -EINVAL;
 685                         goto exit_miscdev;
 686                 }
 687
 688                 err = watchdog_start();
 689                 if (err) {
 690                         pr_err("cannot start watchdog timer\n");
 691                         goto exit_miscdev;
 692                 }
 693
 694                 mutex_lock(&watchdog.lock);
 695                 err = superio_enter(sioaddr);
 696                 if (err)
 697                         goto exit_unlock;
 698                 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 699
 700                 if (start_withtimeout > 0xff) {
 701                         /* select minutes for timer units */
 702                         superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
 703                                 F71808FG_FLAG_WD_UNIT);
 704                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 705                                 DIV_ROUND_UP(start_withtimeout, 60));
 706                 } else {
 707                         /* select seconds for timer units */
 708                         superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
 709                                 F71808FG_FLAG_WD_UNIT);
 710                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 711                                 start_withtimeout);
 712                 }
 713
 714                 superio_exit(sioaddr);
 715                 mutex_unlock(&watchdog.lock);
 716
 717                 if (nowayout)
 718                         __module_get(THIS_MODULE);
 719
 720                 pr_info("watchdog started with initial timeout of %u sec\n",
 721                         start_withtimeout);
 722         }
 723
 724         return 0;
 725
 726 exit_unlock:
 727         mutex_unlock(&watchdog.lock);
 728 exit_miscdev:
 729         misc_deregister(&watchdog_miscdev);
 730 exit_reboot:
 731         unregister_reboot_notifier(&watchdog_notifier);
 732
 733         return err;
 734 }
 735
 736 static int __init f71808e_find(int sioaddr)
 737 {
 738         u16 devid;
 739         int err = superio_enter(sioaddr);
 740         if (err)
 741                 return err;
 742
 743         devid = superio_inw(sioaddr, SIO_REG_MANID);
 744         if (devid != SIO_FINTEK_ID) {
 745                 pr_debug("Not a Fintek device\n");
 746                 err = -ENODEV;
 747                 goto exit;
 748         }
 749
 750         devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
 751         switch (devid) {
 752         case SIO_F71808_ID:
 753                 watchdog.type = f71808fg;
 754                 break;
 755         case SIO_F71862_ID:
 756                 watchdog.type = f71862fg;
 757                 err = f71862fg_pin_configure(0); /* validate module parameter */
 758                 break;
 759         case SIO_F71869_ID:
 760         case SIO_F71869A_ID:
 761                 watchdog.type = f71869;
 762                 break;
 763         case SIO_F71882_ID:
 764                 watchdog.type = f71882fg;
 765                 break;
 766         case SIO_F71889_ID:
 767                 watchdog.type = f71889fg;
 768                 break;
 769         case SIO_F71858_ID:
 770                 /* Confirmed (by datasheet) not to have a watchdog. */
 771                 err = -ENODEV;
 772                 goto exit;
 773         default:
 774                 pr_info("Unrecognized Fintek device: %04x\n",
 775                         (unsigned int)devid);
 776                 err = -ENODEV;
 777                 goto exit;
 778         }
 779
 780         pr_info("Found %s watchdog chip, revision %d\n",
 781                 f71808e_names[watchdog.type],
 782                 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
 783 exit:
 784         superio_exit(sioaddr);
 785         return err;
 786 }
 787
 788 static int __init f71808e_init(void)
 789 {
 790         static const unsigned short addrs[] = { 0x2e, 0x4e };
 791         int err = -ENODEV;
 792         int i;
 793
 794         for (i = 0; i < ARRAY_SIZE(addrs); i++) {
 795                 err = f71808e_find(addrs[i]);
 796                 if (err == 0)
 797                         break;
 798         }
 799         if (i == ARRAY_SIZE(addrs))
 800                 return err;
 801
 802         return watchdog_init(addrs[i]);
 803 }
 804
 805 static void __exit f71808e_exit(void)
 806 {
 807         if (watchdog_is_running()) {
 808                 pr_warn("Watchdog timer still running, stopping it\n");
 809                 watchdog_stop();
 810         }
 811         misc_deregister(&watchdog_miscdev);
 812         unregister_reboot_notifier(&watchdog_notifier);
 813 }
 814
 815 MODULE_DESCRIPTION("F71808E Watchdog Driver");
 816 MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
 817 MODULE_LICENSE("GPL");
 818
 819 module_init(f71808e_init);
 820 module_exit(f71808e_exit);