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 disable 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_F81866_REG_PORT_SEL 0x27    /* F81866 Multi-Function Register */
  49 #define SIO_REG_MFUNCT1         0x29    /* Multi function select 1 */
  50 #define SIO_REG_MFUNCT2         0x2a    /* Multi function select 2 */
  51 #define SIO_REG_MFUNCT3         0x2b    /* Multi function select 3 */
  52 #define SIO_F81866_REG_GPIO1    0x2c    /* F81866 GPIO1 Enable Register */
  53 #define SIO_REG_ENABLE          0x30    /* Logical device enable */
  54 #define SIO_REG_ADDR            0x60    /* Logical device address (2 bytes) */
  55
  56 #define SIO_FINTEK_ID           0x1934  /* Manufacturers ID */
  57 #define SIO_F71808_ID           0x0901  /* Chipset ID */
  58 #define SIO_F71858_ID           0x0507  /* Chipset ID */
  59 #define SIO_F71862_ID           0x0601  /* Chipset ID */
  60 #define SIO_F71868_ID           0x1106  /* Chipset ID */
  61 #define SIO_F71869_ID           0x0814  /* Chipset ID */
  62 #define SIO_F71869A_ID          0x1007  /* Chipset ID */
  63 #define SIO_F71882_ID           0x0541  /* Chipset ID */
  64 #define SIO_F71889_ID           0x0723  /* Chipset ID */
  65 #define SIO_F81865_ID           0x0704  /* Chipset ID */
  66 #define SIO_F81866_ID           0x1010  /* Chipset ID */
  67
  68 #define F71808FG_REG_WDO_CONF           0xf0
  69 #define F71808FG_REG_WDT_CONF           0xf5
  70 #define F71808FG_REG_WD_TIME            0xf6
  71
  72 #define F71808FG_FLAG_WDOUT_EN          7
  73
  74 #define F71808FG_FLAG_WDTMOUT_STS       6
  75 #define F71808FG_FLAG_WD_EN             5
  76 #define F71808FG_FLAG_WD_PULSE          4
  77 #define F71808FG_FLAG_WD_UNIT           3
  78
  79 #define F81865_REG_WDO_CONF             0xfa
  80 #define F81865_FLAG_WDOUT_EN            0
  81
  82 /* Default values */
  83 #define WATCHDOG_TIMEOUT        60      /* 1 minute default timeout */
  84 #define WATCHDOG_MAX_TIMEOUT    (60 * 255)
  85 #define WATCHDOG_PULSE_WIDTH    125     /* 125 ms, default pulse width for
  86                                            watchdog signal */
  87 #define WATCHDOG_F71862FG_PIN   63      /* default watchdog reset output
  88                                            pin number 63 */
  89
  90 static unsigned short force_id;
  91 module_param(force_id, ushort, 0);
  92 MODULE_PARM_DESC(force_id, "Override the detected device ID");
  93
  94 static const int max_timeout = WATCHDOG_MAX_TIMEOUT;
  95 static int timeout = WATCHDOG_TIMEOUT;  /* default timeout in seconds */
  96 module_param(timeout, int, 0);
  97 MODULE_PARM_DESC(timeout,
  98         "Watchdog timeout in seconds. 1<= timeout <="
  99                         __MODULE_STRING(WATCHDOG_MAX_TIMEOUT) " (default="
 100                         __MODULE_STRING(WATCHDOG_TIMEOUT) ")");
 101
 102 static unsigned int pulse_width = WATCHDOG_PULSE_WIDTH;
 103 module_param(pulse_width, uint, 0);
 104 MODULE_PARM_DESC(pulse_width,
 105         "Watchdog signal pulse width. 0(=level), 1, 25, 30, 125, 150, 5000 or 6000 ms"
 106                         " (default=" __MODULE_STRING(WATCHDOG_PULSE_WIDTH) ")");
 107
 108 static unsigned int f71862fg_pin = WATCHDOG_F71862FG_PIN;
 109 module_param(f71862fg_pin, uint, 0);
 110 MODULE_PARM_DESC(f71862fg_pin,
 111         "Watchdog f71862fg reset output pin configuration. Choose pin 56 or 63"
 112                         " (default=" __MODULE_STRING(WATCHDOG_F71862FG_PIN)")");
 113
 114 static bool nowayout = WATCHDOG_NOWAYOUT;
 115 module_param(nowayout, bool, 0444);
 116 MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
 117
 118 static unsigned int start_withtimeout;
 119 module_param(start_withtimeout, uint, 0);
 120 MODULE_PARM_DESC(start_withtimeout, "Start watchdog timer on module load with"
 121         " given initial timeout. Zero (default) disables this feature.");
 122
 123 enum chips { f71808fg, f71858fg, f71862fg, f71868, f71869, f71882fg, f71889fg,
 124              f81865, f81866};
 125
 126 static const char *f71808e_names[] = {
 127         "f71808fg",
 128         "f71858fg",
 129         "f71862fg",
 130         "f71868",
 131         "f71869",
 132         "f71882fg",
 133         "f71889fg",
 134         "f81865",
 135         "f81866",
 136 };
 137
 138 /* Super-I/O Function prototypes */
 139 static inline int superio_inb(int base, int reg);
 140 static inline int superio_inw(int base, int reg);
 141 static inline void superio_outb(int base, int reg, u8 val);
 142 static inline void superio_set_bit(int base, int reg, int bit);
 143 static inline void superio_clear_bit(int base, int reg, int bit);
 144 static inline int superio_enter(int base);
 145 static inline void superio_select(int base, int ld);
 146 static inline void superio_exit(int base);
 147
 148 struct watchdog_data {
 149         unsigned short  sioaddr;
 150         enum chips      type;
 151         unsigned long   opened;
 152         struct mutex    lock;
 153         char            expect_close;
 154         struct watchdog_info ident;
 155
 156         unsigned short  timeout;
 157         u8              timer_val;      /* content for the wd_time register */
 158         char            minutes_mode;
 159         u8              pulse_val;      /* pulse width flag */
 160         char            pulse_mode;     /* enable pulse output mode? */
 161         char            caused_reboot;  /* last reboot was by the watchdog */
 162 };
 163
 164 static struct watchdog_data watchdog = {
 165         .lock = __MUTEX_INITIALIZER(watchdog.lock),
 166 };
 167
 168 /* Super I/O functions */
 169 static inline int superio_inb(int base, int reg)
 170 {
 171         outb(reg, base);
 172         return inb(base + 1);
 173 }
 174
 175 static int superio_inw(int base, int reg)
 176 {
 177         int val;
 178         val  = superio_inb(base, reg) << 8;
 179         val |= superio_inb(base, reg + 1);
 180         return val;
 181 }
 182
 183 static inline void superio_outb(int base, int reg, u8 val)
 184 {
 185         outb(reg, base);
 186         outb(val, base + 1);
 187 }
 188
 189 static inline void superio_set_bit(int base, int reg, int bit)
 190 {
 191         unsigned long val = superio_inb(base, reg);
 192         __set_bit(bit, &val);
 193         superio_outb(base, reg, val);
 194 }
 195
 196 static inline void superio_clear_bit(int base, int reg, int bit)
 197 {
 198         unsigned long val = superio_inb(base, reg);
 199         __clear_bit(bit, &val);
 200         superio_outb(base, reg, val);
 201 }
 202
 203 static inline int superio_enter(int base)
 204 {
 205         /* Don't step on other drivers' I/O space by accident */
 206         if (!request_muxed_region(base, 2, DRVNAME)) {
 207                 pr_err("I/O address 0x%04x already in use\n", (int)base);
 208                 return -EBUSY;
 209         }
 210
 211         /* according to the datasheet the key must be sent twice! */
 212         outb(SIO_UNLOCK_KEY, base);
 213         outb(SIO_UNLOCK_KEY, base);
 214
 215         return 0;
 216 }
 217
 218 static inline void superio_select(int base, int ld)
 219 {
 220         outb(SIO_REG_LDSEL, base);
 221         outb(ld, base + 1);
 222 }
 223
 224 static inline void superio_exit(int base)
 225 {
 226         outb(SIO_LOCK_KEY, base);
 227         release_region(base, 2);
 228 }
 229
 230 static int watchdog_set_timeout(int timeout)
 231 {
 232         if (timeout <= 0
 233          || timeout >  max_timeout) {
 234                 pr_err("watchdog timeout out of range\n");
 235                 return -EINVAL;
 236         }
 237
 238         mutex_lock(&watchdog.lock);
 239
 240         watchdog.timeout = timeout;
 241         if (timeout > 0xff) {
 242                 watchdog.timer_val = DIV_ROUND_UP(timeout, 60);
 243                 watchdog.minutes_mode = true;
 244         } else {
 245                 watchdog.timer_val = timeout;
 246                 watchdog.minutes_mode = false;
 247         }
 248
 249         mutex_unlock(&watchdog.lock);
 250
 251         return 0;
 252 }
 253
 254 static int watchdog_set_pulse_width(unsigned int pw)
 255 {
 256         int err = 0;
 257         unsigned int t1 = 25, t2 = 125, t3 = 5000;
 258
 259         if (watchdog.type == f71868) {
 260                 t1 = 30;
 261                 t2 = 150;
 262                 t3 = 6000;
 263         }
 264
 265         mutex_lock(&watchdog.lock);
 266
 267         if        (pw <=  1) {
 268                 watchdog.pulse_val = 0;
 269         } else if (pw <= t1) {
 270                 watchdog.pulse_val = 1;
 271         } else if (pw <= t2) {
 272                 watchdog.pulse_val = 2;
 273         } else if (pw <= t3) {
 274                 watchdog.pulse_val = 3;
 275         } else {
 276                 pr_err("pulse width out of range\n");
 277                 err = -EINVAL;
 278                 goto exit_unlock;
 279         }
 280
 281         watchdog.pulse_mode = pw;
 282
 283 exit_unlock:
 284         mutex_unlock(&watchdog.lock);
 285         return err;
 286 }
 287
 288 static int watchdog_keepalive(void)
 289 {
 290         int err = 0;
 291
 292         mutex_lock(&watchdog.lock);
 293         err = superio_enter(watchdog.sioaddr);
 294         if (err)
 295                 goto exit_unlock;
 296         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 297
 298         if (watchdog.minutes_mode)
 299                 /* select minutes for timer units */
 300                 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 301                                 F71808FG_FLAG_WD_UNIT);
 302         else
 303                 /* select seconds for timer units */
 304                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 305                                 F71808FG_FLAG_WD_UNIT);
 306
 307         /* Set timer value */
 308         superio_outb(watchdog.sioaddr, F71808FG_REG_WD_TIME,
 309                            watchdog.timer_val);
 310
 311         superio_exit(watchdog.sioaddr);
 312
 313 exit_unlock:
 314         mutex_unlock(&watchdog.lock);
 315         return err;
 316 }
 317
 318 static int f71862fg_pin_configure(unsigned short ioaddr)
 319 {
 320         /* When ioaddr is non-zero the calling function has to take care of
 321            mutex handling and superio preparation! */
 322
 323         if (f71862fg_pin == 63) {
 324                 if (ioaddr) {
 325                         /* SPI must be disabled first to use this pin! */
 326                         superio_clear_bit(ioaddr, SIO_REG_ROM_ADDR_SEL, 6);
 327                         superio_set_bit(ioaddr, SIO_REG_MFUNCT3, 4);
 328                 }
 329         } else if (f71862fg_pin == 56) {
 330                 if (ioaddr)
 331                         superio_set_bit(ioaddr, SIO_REG_MFUNCT1, 1);
 332         } else {
 333                 pr_err("Invalid argument f71862fg_pin=%d\n", f71862fg_pin);
 334                 return -EINVAL;
 335         }
 336         return 0;
 337 }
 338
 339 static int watchdog_start(void)
 340 {
 341         int err;
 342         u8 tmp;
 343
 344         /* Make sure we don't die as soon as the watchdog is enabled below */
 345         err = watchdog_keepalive();
 346         if (err)
 347                 return err;
 348
 349         mutex_lock(&watchdog.lock);
 350         err = superio_enter(watchdog.sioaddr);
 351         if (err)
 352                 goto exit_unlock;
 353         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 354
 355         /* Watchdog pin configuration */
 356         switch (watchdog.type) {
 357         case f71808fg:
 358                 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
 359                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);
 360                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
 361                 break;
 362
 363         case f71862fg:
 364                 err = f71862fg_pin_configure(watchdog.sioaddr);
 365                 if (err)
 366                         goto exit_superio;
 367                 break;
 368
 369         case f71868:
 370         case f71869:
 371                 /* GPIO14 --> WDTRST# */
 372                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4);
 373                 break;
 374
 375         case f71882fg:
 376                 /* Set pin 56 to WDTRST# */
 377                 superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
 378                 break;
 379
 380         case f71889fg:
 381                 /* set pin 40 to WDTRST# */
 382                 superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,
 383                         superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
 384                 break;
 385
 386         case f81865:
 387                 /* Set pin 70 to WDTRST# */
 388                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 5);
 389                 break;
 390
 391         case f81866:
 392                 /*
 393                  * GPIO1 Control Register when 27h BIT3:2 = 01 & BIT0 = 0.
 394                  * The PIN 70(GPIO15/WDTRST) is controlled by 2Ch:
 395                  *     BIT5: 0 -> WDTRST#
 396                  *           1 -> GPIO15
 397                  */
 398                 tmp = superio_inb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL);
 399                 tmp &= ~(BIT(3) | BIT(0));
 400                 tmp |= BIT(2);
 401                 superio_outb(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL, tmp);
 402
 403                 superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1, 5);
 404                 break;
 405
 406         default:
 407                 /*
 408                  * 'default' label to shut up the compiler and catch
 409                  * programmer errors
 410                  */
 411                 err = -ENODEV;
 412                 goto exit_superio;
 413         }
 414
 415         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 416         superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
 417
 418         if (watchdog.type == f81865 || watchdog.type == f81866)
 419                 superio_set_bit(watchdog.sioaddr, F81865_REG_WDO_CONF,
 420                                 F81865_FLAG_WDOUT_EN);
 421         else
 422                 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
 423                                 F71808FG_FLAG_WDOUT_EN);
 424
 425         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 426                         F71808FG_FLAG_WD_EN);
 427
 428         if (watchdog.pulse_mode) {
 429                 /* Select "pulse" output mode with given duration */
 430                 u8 wdt_conf = superio_inb(watchdog.sioaddr,
 431                                 F71808FG_REG_WDT_CONF);
 432
 433                 /* Set WD_PSWIDTH bits (1:0) */
 434                 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
 435                 /* Set WD_PULSE to "pulse" mode */
 436                 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
 437
 438                 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 439                                 wdt_conf);
 440         } else {
 441                 /* Select "level" output mode */
 442                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 443                                 F71808FG_FLAG_WD_PULSE);
 444         }
 445
 446 exit_superio:
 447         superio_exit(watchdog.sioaddr);
 448 exit_unlock:
 449         mutex_unlock(&watchdog.lock);
 450
 451         return err;
 452 }
 453
 454 static int watchdog_stop(void)
 455 {
 456         int err = 0;
 457
 458         mutex_lock(&watchdog.lock);
 459         err = superio_enter(watchdog.sioaddr);
 460         if (err)
 461                 goto exit_unlock;
 462         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 463
 464         superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 465                         F71808FG_FLAG_WD_EN);
 466
 467         superio_exit(watchdog.sioaddr);
 468
 469 exit_unlock:
 470         mutex_unlock(&watchdog.lock);
 471
 472         return err;
 473 }
 474
 475 static int watchdog_get_status(void)
 476 {
 477         int status = 0;
 478
 479         mutex_lock(&watchdog.lock);
 480         status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
 481         mutex_unlock(&watchdog.lock);
 482
 483         return status;
 484 }
 485
 486 static bool watchdog_is_running(void)
 487 {
 488         /*
 489          * if we fail to determine the watchdog's status assume it to be
 490          * running to be on the safe side
 491          */
 492         bool is_running = true;
 493
 494         mutex_lock(&watchdog.lock);
 495         if (superio_enter(watchdog.sioaddr))
 496                 goto exit_unlock;
 497         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 498
 499         is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
 500                 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
 501                         & BIT(F71808FG_FLAG_WD_EN));
 502
 503         superio_exit(watchdog.sioaddr);
 504
 505 exit_unlock:
 506         mutex_unlock(&watchdog.lock);
 507         return is_running;
 508 }
 509
 510 /* /dev/watchdog api */
 511
 512 static int watchdog_open(struct inode *inode, struct file *file)
 513 {
 514         int err;
 515
 516         /* If the watchdog is alive we don't need to start it again */
 517         if (test_and_set_bit(0, &watchdog.opened))
 518                 return -EBUSY;
 519
 520         err = watchdog_start();
 521         if (err) {
 522                 clear_bit(0, &watchdog.opened);
 523                 return err;
 524         }
 525
 526         if (nowayout)
 527                 __module_get(THIS_MODULE);
 528
 529         watchdog.expect_close = 0;
 530         return stream_open(inode, file);
 531 }
 532
 533 static int watchdog_release(struct inode *inode, struct file *file)
 534 {
 535         clear_bit(0, &watchdog.opened);
 536
 537         if (!watchdog.expect_close) {
 538                 watchdog_keepalive();
 539                 pr_crit("Unexpected close, not stopping watchdog!\n");
 540         } else if (!nowayout) {
 541                 watchdog_stop();
 542         }
 543         return 0;
 544 }
 545
 546 /*
 547  *      watchdog_write:
 548  *      @file: file handle to the watchdog
 549  *      @buf: buffer to write
 550  *      @count: count of bytes
 551  *      @ppos: pointer to the position to write. No seeks allowed
 552  *
 553  *      A write to a watchdog device is defined as a keepalive signal. Any
 554  *      write of data will do, as we we don't define content meaning.
 555  */
 556
 557 static ssize_t watchdog_write(struct file *file, const char __user *buf,
 558                             size_t count, loff_t *ppos)
 559 {
 560         if (count) {
 561                 if (!nowayout) {
 562                         size_t i;
 563
 564                         /* In case it was set long ago */
 565                         bool expect_close = false;
 566
 567                         for (i = 0; i != count; i++) {
 568                                 char c;
 569                                 if (get_user(c, buf + i))
 570                                         return -EFAULT;
 571                                 if (c == 'V')
 572                                         expect_close = true;
 573                         }
 574
 575                         /* Properly order writes across fork()ed processes */
 576                         mutex_lock(&watchdog.lock);
 577                         watchdog.expect_close = expect_close;
 578                         mutex_unlock(&watchdog.lock);
 579                 }
 580
 581                 /* someone wrote to us, we should restart timer */
 582                 watchdog_keepalive();
 583         }
 584         return count;
 585 }
 586
 587 /*
 588  *      watchdog_ioctl:
 589  *      @inode: inode of the device
 590  *      @file: file handle to the device
 591  *      @cmd: watchdog command
 592  *      @arg: argument pointer
 593  *
 594  *      The watchdog API defines a common set of functions for all watchdogs
 595  *      according to their available features.
 596  */
 597 static long watchdog_ioctl(struct file *file, unsigned int cmd,
 598         unsigned long arg)
 599 {
 600         int status;
 601         int new_options;
 602         int new_timeout;
 603         union {
 604                 struct watchdog_info __user *ident;
 605                 int __user *i;
 606         } uarg;
 607
 608         uarg.i = (int __user *)arg;
 609
 610         switch (cmd) {
 611         case WDIOC_GETSUPPORT:
 612                 return copy_to_user(uarg.ident, &watchdog.ident,
 613                         sizeof(watchdog.ident)) ? -EFAULT : 0;
 614
 615         case WDIOC_GETSTATUS:
 616                 status = watchdog_get_status();
 617                 if (status < 0)
 618                         return status;
 619                 return put_user(status, uarg.i);
 620
 621         case WDIOC_GETBOOTSTATUS:
 622                 return put_user(0, uarg.i);
 623
 624         case WDIOC_SETOPTIONS:
 625                 if (get_user(new_options, uarg.i))
 626                         return -EFAULT;
 627
 628                 if (new_options & WDIOS_DISABLECARD)
 629                         watchdog_stop();
 630
 631                 if (new_options & WDIOS_ENABLECARD)
 632                         return watchdog_start();
 633                 /* fall through */
 634
 635         case WDIOC_KEEPALIVE:
 636                 watchdog_keepalive();
 637                 return 0;
 638
 639         case WDIOC_SETTIMEOUT:
 640                 if (get_user(new_timeout, uarg.i))
 641                         return -EFAULT;
 642
 643                 if (watchdog_set_timeout(new_timeout))
 644                         return -EINVAL;
 645
 646                 watchdog_keepalive();
 647                 /* fall through */
 648
 649         case WDIOC_GETTIMEOUT:
 650                 return put_user(watchdog.timeout, uarg.i);
 651
 652         default:
 653                 return -ENOTTY;
 654
 655         }
 656 }
 657
 658 static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
 659         void *unused)
 660 {
 661         if (code == SYS_DOWN || code == SYS_HALT)
 662                 watchdog_stop();
 663         return NOTIFY_DONE;
 664 }
 665
 666 static const struct file_operations watchdog_fops = {
 667         .owner          = THIS_MODULE,
 668         .llseek         = no_llseek,
 669         .open           = watchdog_open,
 670         .release        = watchdog_release,
 671         .write          = watchdog_write,
 672         .unlocked_ioctl = watchdog_ioctl,
 673 };
 674
 675 static struct miscdevice watchdog_miscdev = {
 676         .minor          = WATCHDOG_MINOR,
 677         .name           = "watchdog",
 678         .fops           = &watchdog_fops,
 679 };
 680
 681 static struct notifier_block watchdog_notifier = {
 682         .notifier_call = watchdog_notify_sys,
 683 };
 684
 685 static int __init watchdog_init(int sioaddr)
 686 {
 687         int wdt_conf, err = 0;
 688
 689         /* No need to lock watchdog.lock here because no entry points
 690          * into the module have been registered yet.
 691          */
 692         watchdog.sioaddr = sioaddr;
 693         watchdog.ident.options = WDIOC_SETTIMEOUT
 694                                 | WDIOF_MAGICCLOSE
 695                                 | WDIOF_KEEPALIVEPING;
 696
 697         snprintf(watchdog.ident.identity,
 698                 sizeof(watchdog.ident.identity), "%s watchdog",
 699                 f71808e_names[watchdog.type]);
 700
 701         err = superio_enter(sioaddr);
 702         if (err)
 703                 return err;
 704         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 705
 706         wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
 707         watchdog.caused_reboot = wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS);
 708
 709         superio_exit(sioaddr);
 710
 711         err = watchdog_set_timeout(timeout);
 712         if (err)
 713                 return err;
 714         err = watchdog_set_pulse_width(pulse_width);
 715         if (err)
 716                 return err;
 717
 718         err = register_reboot_notifier(&watchdog_notifier);
 719         if (err)
 720                 return err;
 721
 722         err = misc_register(&watchdog_miscdev);
 723         if (err) {
 724                 pr_err("cannot register miscdev on minor=%d\n",
 725                        watchdog_miscdev.minor);
 726                 goto exit_reboot;
 727         }
 728
 729         if (start_withtimeout) {
 730                 if (start_withtimeout <= 0
 731                  || start_withtimeout >  max_timeout) {
 732                         pr_err("starting timeout out of range\n");
 733                         err = -EINVAL;
 734                         goto exit_miscdev;
 735                 }
 736
 737                 err = watchdog_start();
 738                 if (err) {
 739                         pr_err("cannot start watchdog timer\n");
 740                         goto exit_miscdev;
 741                 }
 742
 743                 mutex_lock(&watchdog.lock);
 744                 err = superio_enter(sioaddr);
 745                 if (err)
 746                         goto exit_unlock;
 747                 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 748
 749                 if (start_withtimeout > 0xff) {
 750                         /* select minutes for timer units */
 751                         superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
 752                                 F71808FG_FLAG_WD_UNIT);
 753                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 754                                 DIV_ROUND_UP(start_withtimeout, 60));
 755                 } else {
 756                         /* select seconds for timer units */
 757                         superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
 758                                 F71808FG_FLAG_WD_UNIT);
 759                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 760                                 start_withtimeout);
 761                 }
 762
 763                 superio_exit(sioaddr);
 764                 mutex_unlock(&watchdog.lock);
 765
 766                 if (nowayout)
 767                         __module_get(THIS_MODULE);
 768
 769                 pr_info("watchdog started with initial timeout of %u sec\n",
 770                         start_withtimeout);
 771         }
 772
 773         return 0;
 774
 775 exit_unlock:
 776         mutex_unlock(&watchdog.lock);
 777 exit_miscdev:
 778         misc_deregister(&watchdog_miscdev);
 779 exit_reboot:
 780         unregister_reboot_notifier(&watchdog_notifier);
 781
 782         return err;
 783 }
 784
 785 static int __init f71808e_find(int sioaddr)
 786 {
 787         u16 devid;
 788         int err = superio_enter(sioaddr);
 789         if (err)
 790                 return err;
 791
 792         devid = superio_inw(sioaddr, SIO_REG_MANID);
 793         if (devid != SIO_FINTEK_ID) {
 794                 pr_debug("Not a Fintek device\n");
 795                 err = -ENODEV;
 796                 goto exit;
 797         }
 798
 799         devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
 800         switch (devid) {
 801         case SIO_F71808_ID:
 802                 watchdog.type = f71808fg;
 803                 break;
 804         case SIO_F71862_ID:
 805                 watchdog.type = f71862fg;
 806                 err = f71862fg_pin_configure(0); /* validate module parameter */
 807                 break;
 808         case SIO_F71868_ID:
 809                 watchdog.type = f71868;
 810                 break;
 811         case SIO_F71869_ID:
 812         case SIO_F71869A_ID:
 813                 watchdog.type = f71869;
 814                 break;
 815         case SIO_F71882_ID:
 816                 watchdog.type = f71882fg;
 817                 break;
 818         case SIO_F71889_ID:
 819                 watchdog.type = f71889fg;
 820                 break;
 821         case SIO_F71858_ID:
 822                 /* Confirmed (by datasheet) not to have a watchdog. */
 823                 err = -ENODEV;
 824                 goto exit;
 825         case SIO_F81865_ID:
 826                 watchdog.type = f81865;
 827                 break;
 828         case SIO_F81866_ID:
 829                 watchdog.type = f81866;
 830                 break;
 831         default:
 832                 pr_info("Unrecognized Fintek device: %04x\n",
 833                         (unsigned int)devid);
 834                 err = -ENODEV;
 835                 goto exit;
 836         }
 837
 838         pr_info("Found %s watchdog chip, revision %d\n",
 839                 f71808e_names[watchdog.type],
 840                 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
 841 exit:
 842         superio_exit(sioaddr);
 843         return err;
 844 }
 845
 846 static int __init f71808e_init(void)
 847 {
 848         static const unsigned short addrs[] = { 0x2e, 0x4e };
 849         int err = -ENODEV;
 850         int i;
 851
 852         for (i = 0; i < ARRAY_SIZE(addrs); i++) {
 853                 err = f71808e_find(addrs[i]);
 854                 if (err == 0)
 855                         break;
 856         }
 857         if (i == ARRAY_SIZE(addrs))
 858                 return err;
 859
 860         return watchdog_init(addrs[i]);
 861 }
 862
 863 static void __exit f71808e_exit(void)
 864 {
 865         if (watchdog_is_running()) {
 866                 pr_warn("Watchdog timer still running, stopping it\n");
 867                 watchdog_stop();
 868         }
 869         misc_deregister(&watchdog_miscdev);
 870         unregister_reboot_notifier(&watchdog_notifier);
 871 }
 872
 873 MODULE_DESCRIPTION("F71808E Watchdog Driver");
 874 MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
 875 MODULE_LICENSE("GPL");
 876
 877 module_init(f71808e_init);
 878 module_exit(f71808e_exit);