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_F71882_ID           0x0541  /* Chipset ID */
  60 #define SIO_F71889_ID           0x0723  /* Chipset ID */
  61
  62 #define F71808FG_REG_WDO_CONF           0xf0
  63 #define F71808FG_REG_WDT_CONF           0xf5
  64 #define F71808FG_REG_WD_TIME            0xf6
  65
  66 #define F71808FG_FLAG_WDOUT_EN          7
  67
  68 #define F71808FG_FLAG_WDTMOUT_STS       5
  69 #define F71808FG_FLAG_WD_EN             5
  70 #define F71808FG_FLAG_WD_PULSE          4
  71 #define F71808FG_FLAG_WD_UNIT           3
  72
  73 /* Default values */
  74 #define WATCHDOG_TIMEOUT        60      /* 1 minute default timeout */
  75 #define WATCHDOG_MAX_TIMEOUT    (60 * 255)
  76 #define WATCHDOG_PULSE_WIDTH    125     /* 125 ms, default pulse width for
  77                                            watchdog signal */
  78 #define WATCHDOG_F71862FG_PIN   63      /* default watchdog reset output
  79                                            pin number 63 */
  80
  81 static unsigned short force_id;
  82 module_param(force_id, ushort, 0);
  83 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  84
  85 static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
  86 static int timeout = WATCHDOG_TIMEOUT;  /* default timeout in seconds */
  87 module_param(timeout, int, 0);
  88 MODULE_PARM_DESC(timeout,
  89         "Watchdog timeout in seconds. 1<= timeout <="
  90                         __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
  91                         __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
  92
  93 static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
  94 module_param(pulse_width, uint, 0);
  95 MODULE_PARM_DESC(pulse_width,
  96         "Watchdog signal pulse width. 0(=level), 1 ms, 25 ms, 125 ms or 5000 ms"
  97                         " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
  98
  99 static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
 100 module_param(f71862fg_pin, uint, 0);
 101 MODULE_PARM_DESC(f71862fg_pin,
 102         "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
 103                         " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
 104
 105 static bool nowayout = WATCHDOG_NOWAYOUT;
 106 module_param(nowayout, bool, 0444);
 107 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
 108
 109 static unsigned int start_withtimeout;
 110 module_param(start_withtimeout, uint, 0);
 111 MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
 112         " given initial timeout. Zero (default) disables this feature.");
 113
 114 enum chips { f71808fg, f71858fg, f71862fg, f71869, f71882fg, f71889fg };
 115
 116 static const char *f71808e_names[] = {
 117         "f71808fg",
 118         "f71858fg",
 119         "f71862fg",
 120         "f71869",
 121         "f71882fg",
 122         "f71889fg",
 123 };
 124
 125 /* Super-I/O Function prototypes */
 126 static inline int superio_inb(int base, int reg);
 127 static inline int superio_inw(int base, int reg);
 128 static inline void superio_outb(int base, int reg, u8 val);
 129 static inline void superio_set_bit(int base, int reg, int bit);
 130 static inline void superio_clear_bit(int base, int reg, int bit);
 131 static inline int superio_enter(int base);
 132 static inline void superio_select(int base, int ld);
 133 static inline void superio_exit(int base);
 134
 135 struct watchdog_data {
 136         unsigned short  sioaddr;
 137         enum chips      type;
 138         unsigned long   opened;
 139         struct mutex    lock;
 140         char            expect_close;
 141         struct watchdog_info ident;
 142
 143         unsigned short  timeout;
 144         u8              timer_val;      /* content for the wd_time register */
 145         char            minutes_mode;
 146         u8              pulse_val;      /* pulse width flag */
 147         char            pulse_mode;     /* enable pulse output mode? */
 148         char            caused_reboot;  /* last reboot was by the watchdog */
 149 };
 150
 151 static struct watchdog_data watchdog = {
 152         .lock = __MUTEX_INITIALIZER(watchdog.lock),
 153 };
 154
 155 /* Super I/O functions */
 156 static inline int superio_inb(int base, int reg)
 157 {
 158         outb(reg, base);
 159         return inb(base + 1);
 160 }
 161
 162 static int superio_inw(int base, int reg)
 163 {
 164         int val;
 165         val  = superio_inb(base, reg) << 8;
 166         val |= superio_inb(base, reg + 1);
 167         return val;
 168 }
 169
 170 static inline void superio_outb(int base, int reg, u8 val)
 171 {
 172         outb(reg, base);
 173         outb(val, base + 1);
 174 }
 175
 176 static inline void superio_set_bit(int base, int reg, int bit)
 177 {
 178         unsigned long val = superio_inb(base, reg);
 179         __set_bit(bit, &val);
 180         superio_outb(base, reg, val);
 181 }
 182
 183 static inline void superio_clear_bit(int base, int reg, int bit)
 184 {
 185         unsigned long val = superio_inb(base, reg);
 186         __clear_bit(bit, &val);
 187         superio_outb(base, reg, val);
 188 }
 189
 190 static inline int superio_enter(int base)
 191 {
 192         /* Don't step on other drivers' I/O space by accident */
 193         if (!request_muxed_region(base, 2, DRVNAME)) {
 194                 pr_err("I/O address 0x%04x already in use\n", (int)base);
 195                 return -EBUSY;
 196         }
 197
 198         /* according to the datasheet the key must be send twice! */
 199         outb(SIO_UNLOCK_KEY, base);
 200         outb(SIO_UNLOCK_KEY, base);
 201
 202         return 0;
 203 }
 204
 205 static inline void superio_select(int base, int ld)
 206 {
 207         outb(SIO_REG_LDSEL, base);
 208         outb(ld, base + 1);
 209 }
 210
 211 static inline void superio_exit(int base)
 212 {
 213         outb(SIO_LOCK_KEY, base);
 214         release_region(base, 2);
 215 }
 216
 217 static int watchdog_set_timeout(int timeout)
 218 {
 219         if (timeout <= 0
 220          || timeout >  max_timeout) {
 221                 pr_err("watchdog timeout out of range\n");
 222                 return -EINVAL;
 223         }
 224
 225         mutex_lock(&watchdog.lock);
 226
 227         watchdog.timeout = timeout;
 228         if (timeout > 0xff) {
 229                 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
 230                 watchdog.minutes_mode = true;
 231         } else {
 232                 watchdog.timer_val = timeout;
 233                 watchdog.minutes_mode = false;
 234         }
 235
 236         mutex_unlock(&watchdog.lock);
 237
 238         return 0;
 239 }
 240
 241 static int watchdog_set_pulse_width(unsigned int pw)
 242 {
 243         int err = 0;
 244
 245         mutex_lock(&watchdog.lock);
 246
 247         if        (pw <=    1) {
 248                 watchdog.pulse_val = 0;
 249         } else if (pw <=   25) {
 250                 watchdog.pulse_val = 1;
 251         } else if (pw <=  125) {
 252                 watchdog.pulse_val = 2;
 253         } else if (pw <= 5000) {
 254                 watchdog.pulse_val = 3;
 255         } else {
 256                 pr_err("pulse width out of range\n");
 257                 err = -EINVAL;
 258                 goto exit_unlock;
 259         }
 260
 261         watchdog.pulse_mode = pw;
 262
 263 exit_unlock:
 264         mutex_unlock(&watchdog.lock);
 265         return err;
 266 }
 267
 268 static int watchdog_keepalive(void)
 269 {
 270         int err = 0;
 271
 272         mutex_lock(&watchdog.lock);
 273         err = superio_enter(watchdog.sioaddr);
 274         if (err)
 275                 goto exit_unlock;
 276         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 277
 278         if (watchdog.minutes_mode)
 279                 /* select minutes for timer units */
 280                 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 281                                 F71808FG_FLAG_WD_UNIT);
 282         else
 283                 /* select seconds for timer units */
 284                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 285                                 F71808FG_FLAG_WD_UNIT);
 286
 287         /* Set timer value */
 288         superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
 289                            watchdog.timer_val);
 290
 291         superio_exit(watchdog.sioaddr);
 292
 293 exit_unlock:
 294         mutex_unlock(&watchdog.lock);
 295         return err;
 296 }
 297
 298 static int f71862fg_pin_configure(unsigned short ioaddr)
 299 {
 300         /* When ioaddr is non-zero the calling function has to take care of
 301            mutex handling and superio preparation! */
 302
 303         if (f71862fg_pin == 63) {
 304                 if (ioaddr) {
 305                         /* SPI must be disabled first to use this pin! */
 306                         superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
 307                         superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
 308                 }
 309         } else if (f71862fg_pin == 56) {
 310                 if (ioaddr)
 311                         superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
 312         } else {
 313                 pr_err("Invalid argument f71862fg_pin=%d\n", 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                 pr_crit("Unexpected close, not stopping watchdog!\n");
 491         } else if (!nowayout) {
 492                 watchdog_stop();
 493         }
 494         return 0;
 495 }
 496
 497 /*
 498  *      watchdog_write:
 499  *      @file: file handle to the watchdog
 500  *      @buf: buffer to write
 501  *      @count: count of bytes
 502  *      @ppos: pointer to the position to write. No seeks allowed
 503  *
 504  *      A write to a watchdog device is defined as a keepalive signal. Any
 505  *      write of data will do, as we we don't define content meaning.
 506  */
 507
 508 static ssize_t watchdog_write(struct file *file, const char __user *buf,
 509                             size_t count, loff_t *ppos)
 510 {
 511         if (count) {
 512                 if (!nowayout) {
 513                         size_t i;
 514
 515                         /* In case it was set long ago */
 516                         bool expect_close = false;
 517
 518                         for (i = 0; i != count; i++) {
 519                                 char c;
 520                                 if (get_user(c, buf + i))
 521                                         return -EFAULT;
 522                                 expect_close = (c == 'V');
 523                         }
 524
 525                         /* Properly order writes across fork()ed processes */
 526                         mutex_lock(&watchdog.lock);
 527                         watchdog.expect_close = expect_close;
 528                         mutex_unlock(&watchdog.lock);
 529                 }
 530
 531                 /* someone wrote to us, we should restart timer */
 532                 watchdog_keepalive();
 533         }
 534         return count;
 535 }
 536
 537 /*
 538  *      watchdog_ioctl:
 539  *      @inode: inode of the device
 540  *      @file: file handle to the device
 541  *      @cmd: watchdog command
 542  *      @arg: argument pointer
 543  *
 544  *      The watchdog API defines a common set of functions for all watchdogs
 545  *      according to their available features.
 546  */
 547 static long watchdog_ioctl(struct file *file, unsigned int cmd,
 548         unsigned long arg)
 549 {
 550         int status;
 551         int new_options;
 552         int new_timeout;
 553         union {
 554                 struct watchdog_info __user *ident;
 555                 int __user *i;
 556         } uarg;
 557
 558         uarg.i = (int __user *)arg;
 559
 560         switch (cmd) {
 561         case WDIOC_GETSUPPORT:
 562                 return copy_to_user(uarg.ident, &watchdog.ident,
 563                         sizeof(watchdog.ident)) ? -EFAULT : 0;
 564
 565         case WDIOC_GETSTATUS:
 566                 status = watchdog_get_status();
 567                 if (status < 0)
 568                         return status;
 569                 return put_user(status, uarg.i);
 570
 571         case WDIOC_GETBOOTSTATUS:
 572                 return put_user(0, uarg.i);
 573
 574         case WDIOC_SETOPTIONS:
 575                 if (get_user(new_options, uarg.i))
 576                         return -EFAULT;
 577
 578                 if (new_options & WDIOS_DISABLECARD)
 579                         watchdog_stop();
 580
 581                 if (new_options & WDIOS_ENABLECARD)
 582                         return watchdog_start();
 583
 584
 585         case WDIOC_KEEPALIVE:
 586                 watchdog_keepalive();
 587                 return 0;
 588
 589         case WDIOC_SETTIMEOUT:
 590                 if (get_user(new_timeout, uarg.i))
 591                         return -EFAULT;
 592
 593                 if (watchdog_set_timeout(new_timeout))
 594                         return -EINVAL;
 595
 596                 watchdog_keepalive();
 597                 /* Fall */
 598
 599         case WDIOC_GETTIMEOUT:
 600                 return put_user(watchdog.timeout, uarg.i);
 601
 602         default:
 603                 return -ENOTTY;
 604
 605         }
 606 }
 607
 608 static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
 609         void *unused)
 610 {
 611         if (code == SYS_DOWN || code == SYS_HALT)
 612                 watchdog_stop();
 613         return NOTIFY_DONE;
 614 }
 615
 616 static const struct file_operations watchdog_fops = {
 617         .owner          = THIS_MODULE,
 618         .llseek         = no_llseek,
 619         .open           = watchdog_open,
 620         .release        = watchdog_release,
 621         .write          = watchdog_write,
 622         .unlocked_ioctl = watchdog_ioctl,
 623 };
 624
 625 static struct miscdevice watchdog_miscdev = {
 626         .minor          = WATCHDOG_MINOR,
 627         .name           = "watchdog",
 628         .fops           = &watchdog_fops,
 629 };
 630
 631 static struct notifier_block watchdog_notifier = {
 632         .notifier_call = watchdog_notify_sys,
 633 };
 634
 635 static int __init watchdog_init(int sioaddr)
 636 {
 637         int wdt_conf, err = 0;
 638
 639         /* No need to lock watchdog.lock here because no entry points
 640          * into the module have been registered yet.
 641          */
 642         watchdog.sioaddr = sioaddr;
 643         watchdog.ident.options = WDIOC_SETTIMEOUT
 644                                 | WDIOF_MAGICCLOSE
 645                                 | WDIOF_KEEPALIVEPING;
 646
 647         snprintf(watchdog.ident.identity,
 648                 sizeof(watchdog.ident.identity), "%s watchdog",
 649                 f71808e_names[watchdog.type]);
 650
 651         err = superio_enter(sioaddr);
 652         if (err)
 653                 return err;
 654         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 655
 656         wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
 657         watchdog.caused_reboot = wdt_conf & F71808FG_FLAG_WDTMOUT_STS;
 658
 659         superio_exit(sioaddr);
 660
 661         err = watchdog_set_timeout(timeout);
 662         if (err)
 663                 return err;
 664         err = watchdog_set_pulse_width(pulse_width);
 665         if (err)
 666                 return err;
 667
 668         err = register_reboot_notifier(&watchdog_notifier);
 669         if (err)
 670                 return err;
 671
 672         err = misc_register(&watchdog_miscdev);
 673         if (err) {
 674                 pr_err("cannot register miscdev on minor=%d\n",
 675                        watchdog_miscdev.minor);
 676                 goto exit_reboot;
 677         }
 678
 679         if (start_withtimeout) {
 680                 if (start_withtimeout <= 0
 681                  || start_withtimeout >  max_timeout) {
 682                         pr_err("starting timeout out of range\n");
 683                         err = -EINVAL;
 684                         goto exit_miscdev;
 685                 }
 686
 687                 err = watchdog_start();
 688                 if (err) {
 689                         pr_err("cannot start watchdog timer\n");
 690                         goto exit_miscdev;
 691                 }
 692
 693                 mutex_lock(&watchdog.lock);
 694                 err = superio_enter(sioaddr);
 695                 if (err)
 696                         goto exit_unlock;
 697                 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 698
 699                 if (start_withtimeout > 0xff) {
 700                         /* select minutes for timer units */
 701                         superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
 702                                 F71808FG_FLAG_WD_UNIT);
 703                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 704                                 DIV_ROUND_UP(start_withtimeout, 60));
 705                 } else {
 706                         /* select seconds for timer units */
 707                         superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
 708                                 F71808FG_FLAG_WD_UNIT);
 709                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 710                                 start_withtimeout);
 711                 }
 712
 713                 superio_exit(sioaddr);
 714                 mutex_unlock(&watchdog.lock);
 715
 716                 if (nowayout)
 717                         __module_get(THIS_MODULE);
 718
 719                 pr_info("watchdog started with initial timeout of %u sec\n",
 720                         start_withtimeout);
 721         }
 722
 723         return 0;
 724
 725 exit_unlock:
 726         mutex_unlock(&watchdog.lock);
 727 exit_miscdev:
 728         misc_deregister(&watchdog_miscdev);
 729 exit_reboot:
 730         unregister_reboot_notifier(&watchdog_notifier);
 731
 732         return err;
 733 }
 734
 735 static int __init f71808e_find(int sioaddr)
 736 {
 737         u16 devid;
 738         int err = superio_enter(sioaddr);
 739         if (err)
 740                 return err;
 741
 742         devid = superio_inw(sioaddr, SIO_REG_MANID);
 743         if (devid != SIO_FINTEK_ID) {
 744                 pr_debug("Not a Fintek device\n");
 745                 err = -ENODEV;
 746                 goto exit;
 747         }
 748
 749         devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
 750         switch (devid) {
 751         case SIO_F71808_ID:
 752                 watchdog.type = f71808fg;
 753                 break;
 754         case SIO_F71862_ID:
 755                 watchdog.type = f71862fg;
 756                 err = f71862fg_pin_configure(0); /* validate module parameter */
 757                 break;
 758         case SIO_F71869_ID:
 759                 watchdog.type = f71869;
 760                 break;
 761         case SIO_F71882_ID:
 762                 watchdog.type = f71882fg;
 763                 break;
 764         case SIO_F71889_ID:
 765                 watchdog.type = f71889fg;
 766                 break;
 767         case SIO_F71858_ID:
 768                 /* Confirmed (by datasheet) not to have a watchdog. */
 769                 err = -ENODEV;
 770                 goto exit;
 771         default:
 772                 pr_info("Unrecognized Fintek device: %04x\n",
 773                         (unsigned int)devid);
 774                 err = -ENODEV;
 775                 goto exit;
 776         }
 777
 778         pr_info("Found %s watchdog chip, revision %d\n",
 779                 f71808e_names[watchdog.type],
 780                 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
 781 exit:
 782         superio_exit(sioaddr);
 783         return err;
 784 }
 785
 786 static int __init f71808e_init(void)
 787 {
 788         static const unsigned short addrs[] = { 0x2e, 0x4e };
 789         int err = -ENODEV;
 790         int i;
 791
 792         for (i = 0; i < ARRAY_SIZE(addrs); i++) {
 793                 err = f71808e_find(addrs[i]);
 794                 if (err == 0)
 795                         break;
 796         }
 797         if (i == ARRAY_SIZE(addrs))
 798                 return err;
 799
 800         return watchdog_init(addrs[i]);
 801 }
 802
 803 static void __exit f71808e_exit(void)
 804 {
 805         if (watchdog_is_running()) {
 806                 pr_warn("Watchdog timer still running, stopping it\n");
 807                 watchdog_stop();
 808         }
 809         misc_deregister(&watchdog_miscdev);
 810         unregister_reboot_notifier(&watchdog_notifier);
 811 }
 812
 813 MODULE_DESCRIPTION("F71808E Watchdog Driver");
 814 MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
 815 MODULE_LICENSE("GPL");
 816
 817 module_init(f71808e_init);
 818 module_exit(f71808e_exit);