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_F71869_ID           0x0814  /* Chipset ID */
  57 #define SIO_F71882_ID           0x0541  /* Chipset ID */
  58 #define SIO_F71889_ID           0x0723  /* Chipset ID */
  59
  60 #define F71808FG_REG_WDO_CONF           0xf0
  61 #define F71808FG_REG_WDT_CONF           0xf5
  62 #define F71808FG_REG_WD_TIME            0xf6
  63
  64 #define F71808FG_FLAG_WDOUT_EN          7
  65
  66 #define F71808FG_FLAG_WDTMOUT_STS       5
  67 #define F71808FG_FLAG_WD_EN             5
  68 #define F71808FG_FLAG_WD_PULSE          4
  69 #define F71808FG_FLAG_WD_UNIT           3
  70
  71 /* Default values */
  72 #define WATCHDOG_TIMEOUT        60      /* 1 minute default timeout */
  73 #define WATCHDOG_MAX_TIMEOUT    (60 * 255)
  74 #define WATCHDOG_PULSE_WIDTH    125     /* 125 ms, default pulse width for
  75                                            watchdog signal */
  76 #define WATCHDOG_F71862FG_PIN   63      /* default watchdog reset output
  77                                            pin number 63 */
  78
  79 static unsigned short force_id;
  80 module_param(force_id, ushort, 0);
  81 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  82
  83 static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
  84 static int timeout = WATCHDOG_TIMEOUT;  /* default timeout in seconds */
  85 module_param(timeout, int, 0);
  86 MODULE_PARM_DESC(timeout,
  87         "Watchdog timeout in seconds. 1<= timeout <="
  88                         __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
  89                         __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
  90
  91 static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
  92 module_param(pulse_width, uint, 0);
  93 MODULE_PARM_DESC(pulse_width,
  94         "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
  95                         " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
  96
  97 static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
  98 module_param(f71862fg_pin, uint, 0);
  99 MODULE_PARM_DESC(f71862fg_pin,
 100         "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
 101                         " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
 102
 103 static bool nowayout = WATCHDOG_NOWAYOUT;
 104 module_param(nowayout, bool, 0444);
 105 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
 106
 107 static unsigned int start_withtimeout;
 108 module_param(start_withtimeout, uint, 0);
 109 MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
 110         " given initial timeout. Zero (default) disables this feature.");
 111
 112 enum chips { f71808fg, f71858fg, f71862fg, f71869, f71882fg, f71889fg };
 113
 114 static const char *f71808e_names[] = {
 115         "f71808fg",
 116         "f71858fg",
 117         "f71862fg",
 118         "f71869",
 119         "f71882fg",
 120         "f71889fg",
 121 };
 122
 123 /* Super-I/O Function prototypes */
 124 static inline int superio_inb(int base, int reg);
 125 static inline int superio_inw(int base, int reg);
 126 static inline void superio_outb(int base, int reg, u8 val);
 127 static inline void superio_set_bit(int base, int reg, int bit);
 128 static inline void superio_clear_bit(int base, int reg, int bit);
 129 static inline int superio_enter(int base);
 130 static inline void superio_select(int base, int ld);
 131 static inline void superio_exit(int base);
 132
 133 struct watchdog_data {
 134         unsigned short  sioaddr;
 135         enum chips      type;
 136         unsigned long   opened;
 137         struct mutex    lock;
 138         char            expect_close;
 139         struct watchdog_info ident;
 140
 141         unsigned short  timeout;
 142         u8              timer_val;      /* content for the wd_time register */
 143         char            minutes_mode;
 144         u8              pulse_val;      /* pulse width flag */
 145         char            pulse_mode;     /* enable pulse output mode? */
 146         char            caused_reboot;  /* last reboot was by the watchdog */
 147 };
 148
 149 static struct watchdog_data watchdog = {
 150         .lock = __MUTEX_INITIALIZER(watchdog.lock),
 151 };
 152
 153 /* Super I/O functions */
 154 static inline int superio_inb(int base, int reg)
 155 {
 156         outb(reg, base);
 157         return inb(base + 1);
 158 }
 159
 160 static int superio_inw(int base, int reg)
 161 {
 162         int val;
 163         val  = superio_inb(base, reg) << 8;
 164         val |= superio_inb(base, reg + 1);
 165         return val;
 166 }
 167
 168 static inline void superio_outb(int base, int reg, u8 val)
 169 {
 170         outb(reg, base);
 171         outb(val, base + 1);
 172 }
 173
 174 static inline void superio_set_bit(int base, int reg, int bit)
 175 {
 176         unsigned long val = superio_inb(base, reg);
 177         __set_bit(bit, &val);
 178         superio_outb(base, reg, val);
 179 }
 180
 181 static inline void superio_clear_bit(int base, int reg, int bit)
 182 {
 183         unsigned long val = superio_inb(base, reg);
 184         __clear_bit(bit, &val);
 185         superio_outb(base, reg, val);
 186 }
 187
 188 static inline int superio_enter(int base)
 189 {
 190         /* Don't step on other drivers' I/O space by accident */
 191         if (!request_muxed_region(base, 2, DRVNAME)) {
 192                 printk(KERN_ERR DRVNAME ": I/O address 0x%04x already in use\n",
 193                                 (int)base);
 194                 return -EBUSY;
 195         }
 196
 197         /* according to the datasheet the key must be send twice! */
 198         outb(SIO_UNLOCK_KEY, base);
 199         outb(SIO_UNLOCK_KEY, base);
 200
 201         return 0;
 202 }
 203
 204 static inline void superio_select(int base, int ld)
 205 {
 206         outb(SIO_REG_LDSEL, base);
 207         outb(ld, base + 1);
 208 }
 209
 210 static inline void superio_exit(int base)
 211 {
 212         outb(SIO_LOCK_KEY, base);
 213         release_region(base, 2);
 214 }
 215
 216 static int watchdog_set_timeout(int timeout)
 217 {
 218         if (timeout <= 0
 219          || timeout >  max_timeout) {
 220                 printk(KERN_ERR DRVNAME ": watchdog timeout out of range\n");
 221                 return -EINVAL;
 222         }
 223
 224         mutex_lock(&watchdog.lock);
 225
 226         watchdog.timeout = timeout;
 227         if (timeout > 0xff) {
 228                 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
 229                 watchdog.minutes_mode = true;
 230         } else {
 231                 watchdog.timer_val = timeout;
 232                 watchdog.minutes_mode = false;
 233         }
 234
 235         mutex_unlock(&watchdog.lock);
 236
 237         return 0;
 238 }
 239
 240 static int watchdog_set_pulse_width(unsigned int pw)
 241 {
 242         int err = 0;
 243
 244         mutex_lock(&watchdog.lock);
 245
 246         if        (pw <=    1) {
 247                 watchdog.pulse_val = 0;
 248         } else if (pw <=   25) {
 249                 watchdog.pulse_val = 1;
 250         } else if (pw <=  125) {
 251                 watchdog.pulse_val = 2;
 252         } else if (pw <= 5000) {
 253                 watchdog.pulse_val = 3;
 254         } else {
 255                 printk(KERN_ERR DRVNAME ": pulse width out of range\n");
 256                 err = -EINVAL;
 257                 goto exit_unlock;
 258         }
 259
 260         watchdog.pulse_mode = pw;
 261
 262 exit_unlock:
 263         mutex_unlock(&watchdog.lock);
 264         return err;
 265 }
 266
 267 static int watchdog_keepalive(void)
 268 {
 269         int err = 0;
 270
 271         mutex_lock(&watchdog.lock);
 272         err = superio_enter(watchdog.sioaddr);
 273         if (err)
 274                 goto exit_unlock;
 275         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 276
 277         if (watchdog.minutes_mode)
 278                 /* select minutes for timer units */
 279                 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 280                                 F71808FG_FLAG_WD_UNIT);
 281         else
 282                 /* select seconds for timer units */
 283                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 284                                 F71808FG_FLAG_WD_UNIT);
 285
 286         /* Set timer value */
 287         superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
 288                            watchdog.timer_val);
 289
 290         superio_exit(watchdog.sioaddr);
 291
 292 exit_unlock:
 293         mutex_unlock(&watchdog.lock);
 294         return err;
 295 }
 296
 297 static int f71862fg_pin_configure(unsigned short ioaddr)
 298 {
 299         /* When ioaddr is non-zero the calling function has to take care of
 300            mutex handling and superio preparation! */
 301
 302         if (f71862fg_pin == 63) {
 303                 if (ioaddr) {
 304                         /* SPI must be disabled first to use this pin! */
 305                         superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
 306                         superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
 307                 }
 308         } else if (f71862fg_pin == 56) {
 309                 if (ioaddr)
 310                         superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
 311         } else {
 312                 printk(KERN_ERR DRVNAME ": Invalid argument f71862fg_pin=%d\n",
 313                                 f71862fg_pin);
 314                 return -EINVAL;
 315         }
 316         return 0;
 317 }
 318
 319 static int watchdog_start(void)
 320 {
 321         /* Make sure we don't die as soon as the watchdog is enabled below */
 322         int err = watchdog_keepalive();
 323         if (err)
 324                 return err;
 325
 326         mutex_lock(&watchdog.lock);
 327         err = superio_enter(watchdog.sioaddr);
 328         if (err)
 329                 goto exit_unlock;
 330         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 331
 332         /* Watchdog pin configuration */
 333         switch (watchdog.type) {
 334         case f71808fg:
 335                 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
 336                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);
 337                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
 338                 break;
 339
 340         case f71862fg:
 341                 err = f71862fg_pin_configure(watchdog.sioaddr);
 342                 if (err)
 343                         goto exit_superio;
 344                 break;
 345
 346         case f71869:
 347                 /* GPIO14 --> WDTRST# */
 348                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4);
 349                 break;
 350
 351         case f71882fg:
 352                 /* Set pin 56 to WDTRST# */
 353                 superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
 354                 break;
 355
 356         case f71889fg:
 357                 /* set pin 40 to WDTRST# */
 358                 superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,
 359                         superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
 360                 break;
 361
 362         default:
 363                 /*
 364                  * 'default' label to shut up the compiler and catch
 365                  * programmer errors
 366                  */
 367                 err = -ENODEV;
 368                 goto exit_superio;
 369         }
 370
 371         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 372         superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
 373         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
 374                         F71808FG_FLAG_WDOUT_EN);
 375
 376         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 377                         F71808FG_FLAG_WD_EN);
 378
 379         if (watchdog.pulse_mode) {
 380                 /* Select "pulse" output mode with given duration */
 381                 u8 wdt_conf = superio_inb(watchdog.sioaddr,
 382                                 F71808FG_REG_WDT_CONF);
 383
 384                 /* Set WD_PSWIDTH bits (1:0) */
 385                 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
 386                 /* Set WD_PULSE to "pulse" mode */
 387                 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
 388
 389                 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 390                                 wdt_conf);
 391         } else {
 392                 /* Select "level" output mode */
 393                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 394                                 F71808FG_FLAG_WD_PULSE);
 395         }
 396
 397 exit_superio:
 398         superio_exit(watchdog.sioaddr);
 399 exit_unlock:
 400         mutex_unlock(&watchdog.lock);
 401
 402         return err;
 403 }
 404
 405 static int watchdog_stop(void)
 406 {
 407         int err = 0;
 408
 409         mutex_lock(&watchdog.lock);
 410         err = superio_enter(watchdog.sioaddr);
 411         if (err)
 412                 goto exit_unlock;
 413         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 414
 415         superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 416                         F71808FG_FLAG_WD_EN);
 417
 418         superio_exit(watchdog.sioaddr);
 419
 420 exit_unlock:
 421         mutex_unlock(&watchdog.lock);
 422
 423         return err;
 424 }
 425
 426 static int watchdog_get_status(void)
 427 {
 428         int status = 0;
 429
 430         mutex_lock(&watchdog.lock);
 431         status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
 432         mutex_unlock(&watchdog.lock);
 433
 434         return status;
 435 }
 436
 437 static bool watchdog_is_running(void)
 438 {
 439         /*
 440          * if we fail to determine the watchdog's status assume it to be
 441          * running to be on the safe side
 442          */
 443         bool is_running = true;
 444
 445         mutex_lock(&watchdog.lock);
 446         if (superio_enter(watchdog.sioaddr))
 447                 goto exit_unlock;
 448         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 449
 450         is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
 451                 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
 452                         & F71808FG_FLAG_WD_EN);
 453
 454         superio_exit(watchdog.sioaddr);
 455
 456 exit_unlock:
 457         mutex_unlock(&watchdog.lock);
 458         return is_running;
 459 }
 460
 461 /* /dev/watchdog api */
 462
 463 static int watchdog_open(struct inode *inode, struct file *file)
 464 {
 465         int err;
 466
 467         /* If the watchdog is alive we don't need to start it again */
 468         if (test_and_set_bit(0, &watchdog.opened))
 469                 return -EBUSY;
 470
 471         err = watchdog_start();
 472         if (err) {
 473                 clear_bit(0, &watchdog.opened);
 474                 return err;
 475         }
 476
 477         if (nowayout)
 478                 __module_get(THIS_MODULE);
 479
 480         watchdog.expect_close = 0;
 481         return nonseekable_open(inode, file);
 482 }
 483
 484 static int watchdog_release(struct inode *inode, struct file *file)
 485 {
 486         clear_bit(0, &watchdog.opened);
 487
 488         if (!watchdog.expect_close) {
 489                 watchdog_keepalive();
 490                 printk(KERN_CRIT DRVNAME
 491                         ": 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                 printk(KERN_ERR DRVNAME
 676                         ": cannot register miscdev on minor=%d\n",
 677                                 watchdog_miscdev.minor);
 678                 goto exit_reboot;
 679         }
 680
 681         if (start_withtimeout) {
 682                 if (start_withtimeout <= 0
 683                  || start_withtimeout >  max_timeout) {
 684                         printk(KERN_ERR DRVNAME
 685                                 ": starting timeout out of range\n");
 686                         err = -EINVAL;
 687                         goto exit_miscdev;
 688                 }
 689
 690                 err = watchdog_start();
 691                 if (err) {
 692                         printk(KERN_ERR DRVNAME
 693                                 ": cannot start watchdog timer\n");
 694                         goto exit_miscdev;
 695                 }
 696
 697                 mutex_lock(&watchdog.lock);
 698                 err = superio_enter(sioaddr);
 699                 if (err)
 700                         goto exit_unlock;
 701                 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 702
 703                 if (start_withtimeout > 0xff) {
 704                         /* select minutes for timer units */
 705                         superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
 706                                 F71808FG_FLAG_WD_UNIT);
 707                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 708                                 DIV_ROUND_UP(start_withtimeout, 60));
 709                 } else {
 710                         /* select seconds for timer units */
 711                         superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
 712                                 F71808FG_FLAG_WD_UNIT);
 713                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 714                                 start_withtimeout);
 715                 }
 716
 717                 superio_exit(sioaddr);
 718                 mutex_unlock(&watchdog.lock);
 719
 720                 if (nowayout)
 721                         __module_get(THIS_MODULE);
 722
 723                 printk(KERN_INFO DRVNAME
 724                         ": watchdog started with initial timeout of %u sec\n",
 725                         start_withtimeout);
 726         }
 727
 728         return 0;
 729
 730 exit_unlock:
 731         mutex_unlock(&watchdog.lock);
 732 exit_miscdev:
 733         misc_deregister(&watchdog_miscdev);
 734 exit_reboot:
 735         unregister_reboot_notifier(&watchdog_notifier);
 736
 737         return err;
 738 }
 739
 740 static int __init f71808e_find(int sioaddr)
 741 {
 742         u16 devid;
 743         int err = superio_enter(sioaddr);
 744         if (err)
 745                 return err;
 746
 747         devid = superio_inw(sioaddr, SIO_REG_MANID);
 748         if (devid != SIO_FINTEK_ID) {
 749                 pr_debug(DRVNAME ": Not a Fintek device\n");
 750                 err = -ENODEV;
 751                 goto exit;
 752         }
 753
 754         devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
 755         switch (devid) {
 756         case SIO_F71808_ID:
 757                 watchdog.type = f71808fg;
 758                 break;
 759         case SIO_F71862_ID:
 760                 watchdog.type = f71862fg;
 761                 err = f71862fg_pin_configure(0); /* validate module parameter */
 762                 break;
 763         case SIO_F71869_ID:
 764                 watchdog.type = f71869;
 765                 break;
 766         case SIO_F71882_ID:
 767                 watchdog.type = f71882fg;
 768                 break;
 769         case SIO_F71889_ID:
 770                 watchdog.type = f71889fg;
 771                 break;
 772         case SIO_F71858_ID:
 773                 /* Confirmed (by datasheet) not to have a watchdog. */
 774                 err = -ENODEV;
 775                 goto exit;
 776         default:
 777                 printk(KERN_INFO DRVNAME ": Unrecognized Fintek device: %04x\n",
 778                        (unsigned int)devid);
 779                 err = -ENODEV;
 780                 goto exit;
 781         }
 782
 783         printk(KERN_INFO DRVNAME ": Found %s watchdog chip, revision %d\n",
 784                 f71808e_names[watchdog.type],
 785                 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
 786 exit:
 787         superio_exit(sioaddr);
 788         return err;
 789 }
 790
 791 static int __init f71808e_init(void)
 792 {
 793         static const unsigned short addrs[] = { 0x2e, 0x4e };
 794         int err = -ENODEV;
 795         int i;
 796
 797         for (i = 0; i < ARRAY_SIZE(addrs); i++) {
 798                 err = f71808e_find(addrs[i]);
 799                 if (err == 0)
 800                         break;
 801         }
 802         if (i == ARRAY_SIZE(addrs))
 803                 return err;
 804
 805         return watchdog_init(addrs[i]);
 806 }
 807
 808 static void __exit f71808e_exit(void)
 809 {
 810         if (watchdog_is_running()) {
 811                 printk(KERN_WARNING DRVNAME
 812                         ": Watchdog timer still running, stopping it\n");
 813                 watchdog_stop();
 814         }
 815         misc_deregister(&watchdog_miscdev);
 816         unregister_reboot_notifier(&watchdog_notifier);
 817 }
 818
 819 MODULE_DESCRIPTION("F71808E Watchdog Driver");
 820 MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
 821 MODULE_LICENSE("GPL");
 822
 823 module_init(f71808e_init);
 824 module_exit(f71808e_exit);