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         /* Make sure we don't die as soon as the watchdog is enabled below */
 342         int err = watchdog_keepalive();
 343         if (err)
 344                 return err;
 345
 346         mutex_lock(&watchdog.lock);
 347         err = superio_enter(watchdog.sioaddr);
 348         if (err)
 349                 goto exit_unlock;
 350         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 351
 352         /* Watchdog pin configuration */
 353         switch (watchdog.type) {
 354         case f71808fg:
 355                 /* Set pin 21 to GPIO23/WDTRST#, then to WDTRST# */
 356                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT2, 3);
 357                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 3);
 358                 break;
 359
 360         case f71862fg:
 361                 err = f71862fg_pin_configure(watchdog.sioaddr);
 362                 if (err)
 363                         goto exit_superio;
 364                 break;
 365
 366         case f71868:
 367         case f71869:
 368                 /* GPIO14 --> WDTRST# */
 369                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 4);
 370                 break;
 371
 372         case f71882fg:
 373                 /* Set pin 56 to WDTRST# */
 374                 superio_set_bit(watchdog.sioaddr, SIO_REG_MFUNCT1, 1);
 375                 break;
 376
 377         case f71889fg:
 378                 /* set pin 40 to WDTRST# */
 379                 superio_outb(watchdog.sioaddr, SIO_REG_MFUNCT3,
 380                         superio_inb(watchdog.sioaddr, SIO_REG_MFUNCT3) & 0xcf);
 381                 break;
 382
 383         case f81865:
 384                 /* Set pin 70 to WDTRST# */
 385                 superio_clear_bit(watchdog.sioaddr, SIO_REG_MFUNCT3, 5);
 386                 break;
 387
 388         case f81866:
 389                 /* Set pin 70 to WDTRST# */
 390                 superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL,
 391                                   BIT(3) | BIT(0));
 392                 superio_set_bit(watchdog.sioaddr, SIO_F81866_REG_PORT_SEL,
 393                                 BIT(2));
 394                 /*
 395                  * GPIO1 Control Register when 27h BIT3:2 = 01 & BIT0 = 0.
 396                  * The PIN 70(GPIO15/WDTRST) is controlled by 2Ch:
 397                  *     BIT5: 0 -> WDTRST#
 398                  *           1 -> GPIO15
 399                  */
 400                 superio_clear_bit(watchdog.sioaddr, SIO_F81866_REG_GPIO1,
 401                                   BIT(5));
 402                 break;
 403
 404         default:
 405                 /*
 406                  * 'default' label to shut up the compiler and catch
 407                  * programmer errors
 408                  */
 409                 err = -ENODEV;
 410                 goto exit_superio;
 411         }
 412
 413         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 414         superio_set_bit(watchdog.sioaddr, SIO_REG_ENABLE, 0);
 415
 416         if (watchdog.type == f81865 || watchdog.type == f81866)
 417                 superio_set_bit(watchdog.sioaddr, F81865_REG_WDO_CONF,
 418                                 F81865_FLAG_WDOUT_EN);
 419         else
 420                 superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDO_CONF,
 421                                 F71808FG_FLAG_WDOUT_EN);
 422
 423         superio_set_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 424                         F71808FG_FLAG_WD_EN);
 425
 426         if (watchdog.pulse_mode) {
 427                 /* Select "pulse" output mode with given duration */
 428                 u8 wdt_conf = superio_inb(watchdog.sioaddr,
 429                                 F71808FG_REG_WDT_CONF);
 430
 431                 /* Set WD_PSWIDTH bits (1:0) */
 432                 wdt_conf = (wdt_conf & 0xfc) | (watchdog.pulse_val & 0x03);
 433                 /* Set WD_PULSE to "pulse" mode */
 434                 wdt_conf |= BIT(F71808FG_FLAG_WD_PULSE);
 435
 436                 superio_outb(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 437                                 wdt_conf);
 438         } else {
 439                 /* Select "level" output mode */
 440                 superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 441                                 F71808FG_FLAG_WD_PULSE);
 442         }
 443
 444 exit_superio:
 445         superio_exit(watchdog.sioaddr);
 446 exit_unlock:
 447         mutex_unlock(&watchdog.lock);
 448
 449         return err;
 450 }
 451
 452 static int watchdog_stop(void)
 453 {
 454         int err = 0;
 455
 456         mutex_lock(&watchdog.lock);
 457         err = superio_enter(watchdog.sioaddr);
 458         if (err)
 459                 goto exit_unlock;
 460         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 461
 462         superio_clear_bit(watchdog.sioaddr, F71808FG_REG_WDT_CONF,
 463                         F71808FG_FLAG_WD_EN);
 464
 465         superio_exit(watchdog.sioaddr);
 466
 467 exit_unlock:
 468         mutex_unlock(&watchdog.lock);
 469
 470         return err;
 471 }
 472
 473 static int watchdog_get_status(void)
 474 {
 475         int status = 0;
 476
 477         mutex_lock(&watchdog.lock);
 478         status = (watchdog.caused_reboot) ? WDIOF_CARDRESET : 0;
 479         mutex_unlock(&watchdog.lock);
 480
 481         return status;
 482 }
 483
 484 static bool watchdog_is_running(void)
 485 {
 486         /*
 487          * if we fail to determine the watchdog's status assume it to be
 488          * running to be on the safe side
 489          */
 490         bool is_running = true;
 491
 492         mutex_lock(&watchdog.lock);
 493         if (superio_enter(watchdog.sioaddr))
 494                 goto exit_unlock;
 495         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 496
 497         is_running = (superio_inb(watchdog.sioaddr, SIO_REG_ENABLE) & BIT(0))
 498                 && (superio_inb(watchdog.sioaddr, F71808FG_REG_WDT_CONF)
 499                         & BIT(F71808FG_FLAG_WD_EN));
 500
 501         superio_exit(watchdog.sioaddr);
 502
 503 exit_unlock:
 504         mutex_unlock(&watchdog.lock);
 505         return is_running;
 506 }
 507
 508 /* /dev/watchdog api */
 509
 510 static int watchdog_open(struct inode *inode, struct file *file)
 511 {
 512         int err;
 513
 514         /* If the watchdog is alive we don't need to start it again */
 515         if (test_and_set_bit(0, &watchdog.opened))
 516                 return -EBUSY;
 517
 518         err = watchdog_start();
 519         if (err) {
 520                 clear_bit(0, &watchdog.opened);
 521                 return err;
 522         }
 523
 524         if (nowayout)
 525                 __module_get(THIS_MODULE);
 526
 527         watchdog.expect_close = 0;
 528         return nonseekable_open(inode, file);
 529 }
 530
 531 static int watchdog_release(struct inode *inode, struct file *file)
 532 {
 533         clear_bit(0, &watchdog.opened);
 534
 535         if (!watchdog.expect_close) {
 536                 watchdog_keepalive();
 537                 pr_crit("Unexpected close, not stopping watchdog!\n");
 538         } else if (!nowayout) {
 539                 watchdog_stop();
 540         }
 541         return 0;
 542 }
 543
 544 /*
 545  *      watchdog_write:
 546  *      @file: file handle to the watchdog
 547  *      @buf: buffer to write
 548  *      @count: count of bytes
 549  *      @ppos: pointer to the position to write. No seeks allowed
 550  *
 551  *      A write to a watchdog device is defined as a keepalive signal. Any
 552  *      write of data will do, as we we don't define content meaning.
 553  */
 554
 555 static ssize_t watchdog_write(struct file *file, const char __user *buf,
 556                             size_t count, loff_t *ppos)
 557 {
 558         if (count) {
 559                 if (!nowayout) {
 560                         size_t i;
 561
 562                         /* In case it was set long ago */
 563                         bool expect_close = false;
 564
 565                         for (i = 0; i != count; i++) {
 566                                 char c;
 567                                 if (get_user(c, buf + i))
 568                                         return -EFAULT;
 569                                 if (c == 'V')
 570                                         expect_close = true;
 571                         }
 572
 573                         /* Properly order writes across fork()ed processes */
 574                         mutex_lock(&watchdog.lock);
 575                         watchdog.expect_close = expect_close;
 576                         mutex_unlock(&watchdog.lock);
 577                 }
 578
 579                 /* someone wrote to us, we should restart timer */
 580                 watchdog_keepalive();
 581         }
 582         return count;
 583 }
 584
 585 /*
 586  *      watchdog_ioctl:
 587  *      @inode: inode of the device
 588  *      @file: file handle to the device
 589  *      @cmd: watchdog command
 590  *      @arg: argument pointer
 591  *
 592  *      The watchdog API defines a common set of functions for all watchdogs
 593  *      according to their available features.
 594  */
 595 static long watchdog_ioctl(struct file *file, unsigned int cmd,
 596         unsigned long arg)
 597 {
 598         int status;
 599         int new_options;
 600         int new_timeout;
 601         union {
 602                 struct watchdog_info __user *ident;
 603                 int __user *i;
 604         } uarg;
 605
 606         uarg.i = (int __user *)arg;
 607
 608         switch (cmd) {
 609         case WDIOC_GETSUPPORT:
 610                 return copy_to_user(uarg.ident, &watchdog.ident,
 611                         sizeof(watchdog.ident)) ? -EFAULT : 0;
 612
 613         case WDIOC_GETSTATUS:
 614                 status = watchdog_get_status();
 615                 if (status < 0)
 616                         return status;
 617                 return put_user(status, uarg.i);
 618
 619         case WDIOC_GETBOOTSTATUS:
 620                 return put_user(0, uarg.i);
 621
 622         case WDIOC_SETOPTIONS:
 623                 if (get_user(new_options, uarg.i))
 624                         return -EFAULT;
 625
 626                 if (new_options & WDIOS_DISABLECARD)
 627                         watchdog_stop();
 628
 629                 if (new_options & WDIOS_ENABLECARD)
 630                         return watchdog_start();
 631                 /* fall through */
 632
 633         case WDIOC_KEEPALIVE:
 634                 watchdog_keepalive();
 635                 return 0;
 636
 637         case WDIOC_SETTIMEOUT:
 638                 if (get_user(new_timeout, uarg.i))
 639                         return -EFAULT;
 640
 641                 if (watchdog_set_timeout(new_timeout))
 642                         return -EINVAL;
 643
 644                 watchdog_keepalive();
 645                 /* fall through */
 646
 647         case WDIOC_GETTIMEOUT:
 648                 return put_user(watchdog.timeout, uarg.i);
 649
 650         default:
 651                 return -ENOTTY;
 652
 653         }
 654 }
 655
 656 static int watchdog_notify_sys(struct notifier_block *this, unsigned long code,
 657         void *unused)
 658 {
 659         if (code == SYS_DOWN || code == SYS_HALT)
 660                 watchdog_stop();
 661         return NOTIFY_DONE;
 662 }
 663
 664 static const struct file_operations watchdog_fops = {
 665         .owner          = THIS_MODULE,
 666         .llseek         = no_llseek,
 667         .open           = watchdog_open,
 668         .release        = watchdog_release,
 669         .write          = watchdog_write,
 670         .unlocked_ioctl = watchdog_ioctl,
 671 };
 672
 673 static struct miscdevice watchdog_miscdev = {
 674         .minor          = WATCHDOG_MINOR,
 675         .name           = "watchdog",
 676         .fops           = &watchdog_fops,
 677 };
 678
 679 static struct notifier_block watchdog_notifier = {
 680         .notifier_call = watchdog_notify_sys,
 681 };
 682
 683 static int __init watchdog_init(int sioaddr)
 684 {
 685         int wdt_conf, err = 0;
 686
 687         /* No need to lock watchdog.lock here because no entry points
 688          * into the module have been registered yet.
 689          */
 690         watchdog.sioaddr = sioaddr;
 691         watchdog.ident.options = WDIOC_SETTIMEOUT
 692                                 | WDIOF_MAGICCLOSE
 693                                 | WDIOF_KEEPALIVEPING;
 694
 695         snprintf(watchdog.ident.identity,
 696                 sizeof(watchdog.ident.identity), "%s watchdog",
 697                 f71808e_names[watchdog.type]);
 698
 699         err = superio_enter(sioaddr);
 700         if (err)
 701                 return err;
 702         superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 703
 704         wdt_conf = superio_inb(sioaddr, F71808FG_REG_WDT_CONF);
 705         watchdog.caused_reboot = wdt_conf & BIT(F71808FG_FLAG_WDTMOUT_STS);
 706
 707         superio_exit(sioaddr);
 708
 709         err = watchdog_set_timeout(timeout);
 710         if (err)
 711                 return err;
 712         err = watchdog_set_pulse_width(pulse_width);
 713         if (err)
 714                 return err;
 715
 716         err = register_reboot_notifier(&watchdog_notifier);
 717         if (err)
 718                 return err;
 719
 720         err = misc_register(&watchdog_miscdev);
 721         if (err) {
 722                 pr_err("cannot register miscdev on minor=%d\n",
 723                        watchdog_miscdev.minor);
 724                 goto exit_reboot;
 725         }
 726
 727         if (start_withtimeout) {
 728                 if (start_withtimeout <= 0
 729                  || start_withtimeout >  max_timeout) {
 730                         pr_err("starting timeout out of range\n");
 731                         err = -EINVAL;
 732                         goto exit_miscdev;
 733                 }
 734
 735                 err = watchdog_start();
 736                 if (err) {
 737                         pr_err("cannot start watchdog timer\n");
 738                         goto exit_miscdev;
 739                 }
 740
 741                 mutex_lock(&watchdog.lock);
 742                 err = superio_enter(sioaddr);
 743                 if (err)
 744                         goto exit_unlock;
 745                 superio_select(watchdog.sioaddr, SIO_F71808FG_LD_WDT);
 746
 747                 if (start_withtimeout > 0xff) {
 748                         /* select minutes for timer units */
 749                         superio_set_bit(sioaddr, F71808FG_REG_WDT_CONF,
 750                                 F71808FG_FLAG_WD_UNIT);
 751                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 752                                 DIV_ROUND_UP(start_withtimeout, 60));
 753                 } else {
 754                         /* select seconds for timer units */
 755                         superio_clear_bit(sioaddr, F71808FG_REG_WDT_CONF,
 756                                 F71808FG_FLAG_WD_UNIT);
 757                         superio_outb(sioaddr, F71808FG_REG_WD_TIME,
 758                                 start_withtimeout);
 759                 }
 760
 761                 superio_exit(sioaddr);
 762                 mutex_unlock(&watchdog.lock);
 763
 764                 if (nowayout)
 765                         __module_get(THIS_MODULE);
 766
 767                 pr_info("watchdog started with initial timeout of %u sec\n",
 768                         start_withtimeout);
 769         }
 770
 771         return 0;
 772
 773 exit_unlock:
 774         mutex_unlock(&watchdog.lock);
 775 exit_miscdev:
 776         misc_deregister(&watchdog_miscdev);
 777 exit_reboot:
 778         unregister_reboot_notifier(&watchdog_notifier);
 779
 780         return err;
 781 }
 782
 783 static int __init f71808e_find(int sioaddr)
 784 {
 785         u16 devid;
 786         int err = superio_enter(sioaddr);
 787         if (err)
 788                 return err;
 789
 790         devid = superio_inw(sioaddr, SIO_REG_MANID);
 791         if (devid != SIO_FINTEK_ID) {
 792                 pr_debug("Not a Fintek device\n");
 793                 err = -ENODEV;
 794                 goto exit;
 795         }
 796
 797         devid = force_id ? force_id : superio_inw(sioaddr, SIO_REG_DEVID);
 798         switch (devid) {
 799         case SIO_F71808_ID:
 800                 watchdog.type = f71808fg;
 801                 break;
 802         case SIO_F71862_ID:
 803                 watchdog.type = f71862fg;
 804                 err = f71862fg_pin_configure(0); /* validate module parameter */
 805                 break;
 806         case SIO_F71868_ID:
 807                 watchdog.type = f71868;
 808                 break;
 809         case SIO_F71869_ID:
 810         case SIO_F71869A_ID:
 811                 watchdog.type = f71869;
 812                 break;
 813         case SIO_F71882_ID:
 814                 watchdog.type = f71882fg;
 815                 break;
 816         case SIO_F71889_ID:
 817                 watchdog.type = f71889fg;
 818                 break;
 819         case SIO_F71858_ID:
 820                 /* Confirmed (by datasheet) not to have a watchdog. */
 821                 err = -ENODEV;
 822                 goto exit;
 823         case SIO_F81865_ID:
 824                 watchdog.type = f81865;
 825                 break;
 826         case SIO_F81866_ID:
 827                 watchdog.type = f81866;
 828                 break;
 829         default:
 830                 pr_info("Unrecognized Fintek device: %04x\n",
 831                         (unsigned int)devid);
 832                 err = -ENODEV;
 833                 goto exit;
 834         }
 835
 836         pr_info("Found %s watchdog chip, revision %d\n",
 837                 f71808e_names[watchdog.type],
 838                 (int)superio_inb(sioaddr, SIO_REG_DEVREV));
 839 exit:
 840         superio_exit(sioaddr);
 841         return err;
 842 }
 843
 844 static int __init f71808e_init(void)
 845 {
 846         static const unsigned short addrs[] = { 0x2e, 0x4e };
 847         int err = -ENODEV;
 848         int i;
 849
 850         for (i = 0; i < ARRAY_SIZE(addrs); i++) {
 851                 err = f71808e_find(addrs[i]);
 852                 if (err == 0)
 853                         break;
 854         }
 855         if (i == ARRAY_SIZE(addrs))
 856                 return err;
 857
 858         return watchdog_init(addrs[i]);
 859 }
 860
 861 static void __exit f71808e_exit(void)
 862 {
 863         if (watchdog_is_running()) {
 864                 pr_warn("Watchdog timer still running, stopping it\n");
 865                 watchdog_stop();
 866         }
 867         misc_deregister(&watchdog_miscdev);
 868         unregister_reboot_notifier(&watchdog_notifier);
 869 }
 870
 871 MODULE_DESCRIPTION("F71808E Watchdog Driver");
 872 MODULE_AUTHOR("Giel van Schijndel <me@mortis.eu>");
 873 MODULE_LICENSE("GPL");
 874
 875 module_init(f71808e_init);
 876 module_exit(f71808e_exit);