drivers/hwmon/applesmc.c

   1 /*
   2  * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
   3  * sensors, fan control, keyboard backlight control) used in Intel-based Apple
   4  * computers.
   5  *
   6  * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
   7  * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
   8  *
   9  * Based on hdaps.c driver:
  10  * Copyright (C) 2005 Robert Love <rml@novell.com>
  11  * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
  12  *
  13  * Fan control based on smcFanControl:
  14  * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
  15  *
  16  * This program is free software; you can redistribute it and/or modify it
  17  * under the terms of the GNU General Public License v2 as published by the
  18  * Free Software Foundation.
  19  *
  20  * This program is distributed in the hope that it will be useful, but WITHOUT
  21  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  22  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  23  * more details.
  24  *
  25  * You should have received a copy of the GNU General Public License along with
  26  * this program; if not, write to the Free Software Foundation, Inc.,
  27  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  28  */
  29
  30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/delay.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/input-polldev.h>
  35 #include <linux/kernel.h>
  36 #include <linux/slab.h>
  37 #include <linux/module.h>
  38 #include <linux/timer.h>
  39 #include <linux/dmi.h>
  40 #include <linux/mutex.h>
  41 #include <linux/hwmon-sysfs.h>
  42 #include <linux/io.h>
  43 #include <linux/leds.h>
  44 #include <linux/hwmon.h>
  45 #include <linux/workqueue.h>
  46 #include <linux/err.h>
  47
  48 /* data port used by Apple SMC */
  49 #define APPLESMC_DATA_PORT      0x300
  50 /* command/status port used by Apple SMC */
  51 #define APPLESMC_CMD_PORT       0x304
  52
  53 #define APPLESMC_NR_PORTS       32 /* 0x300-0x31f */
  54
  55 #define APPLESMC_MAX_DATA_LENGTH 32
  56
  57 /* wait up to 128 ms for a status change. */
  58 #define APPLESMC_MIN_WAIT       0x0010
  59 #define APPLESMC_RETRY_WAIT     0x0100
  60 #define APPLESMC_MAX_WAIT       0x20000
  61
  62 #define APPLESMC_READ_CMD       0x10
  63 #define APPLESMC_WRITE_CMD      0x11
  64 #define APPLESMC_GET_KEY_BY_INDEX_CMD   0x12
  65 #define APPLESMC_GET_KEY_TYPE_CMD       0x13
  66
  67 #define KEY_COUNT_KEY           "#KEY" /* r-o ui32 */
  68
  69 #define LIGHT_SENSOR_LEFT_KEY   "ALV0" /* r-o {alv (6-10 bytes) */
  70 #define LIGHT_SENSOR_RIGHT_KEY  "ALV1" /* r-o {alv (6-10 bytes) */
  71 #define BACKLIGHT_KEY           "LKSB" /* w-o {lkb (2 bytes) */
  72
  73 #define CLAMSHELL_KEY           "MSLD" /* r-o ui8 (unused) */
  74
  75 #define MOTION_SENSOR_X_KEY     "MO_X" /* r-o sp78 (2 bytes) */
  76 #define MOTION_SENSOR_Y_KEY     "MO_Y" /* r-o sp78 (2 bytes) */
  77 #define MOTION_SENSOR_Z_KEY     "MO_Z" /* r-o sp78 (2 bytes) */
  78 #define MOTION_SENSOR_KEY       "MOCN" /* r/w ui16 */
  79
  80 #define FANS_COUNT              "FNum" /* r-o ui8 */
  81 #define FANS_MANUAL             "FS! " /* r-w ui16 */
  82 #define FAN_ID_FMT              "F%dID" /* r-o char[16] */
  83
  84 #define TEMP_SENSOR_TYPE        "sp78"
  85
  86 /* List of keys used to read/write fan speeds */
  87 static const char *const fan_speed_fmt[] = {
  88         "F%dAc",                /* actual speed */
  89         "F%dMn",                /* minimum speed (rw) */
  90         "F%dMx",                /* maximum speed */
  91         "F%dSf",                /* safe speed - not all models */
  92         "F%dTg",                /* target speed (manual: rw) */
  93 };
  94
  95 #define INIT_TIMEOUT_MSECS      5000    /* wait up to 5s for device init ... */
  96 #define INIT_WAIT_MSECS         50      /* ... in 50ms increments */
  97
  98 #define APPLESMC_POLL_INTERVAL  50      /* msecs */
  99 #define APPLESMC_INPUT_FUZZ     4       /* input event threshold */
 100 #define APPLESMC_INPUT_FLAT     4
 101
 102 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
 103 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
 104
 105 /* Dynamic device node attributes */
 106 struct applesmc_dev_attr {
 107         struct sensor_device_attribute sda;     /* hwmon attributes */
 108         char name[32];                          /* room for node file name */
 109 };
 110
 111 /* Dynamic device node group */
 112 struct applesmc_node_group {
 113         char *format;                           /* format string */
 114         void *show;                             /* show function */
 115         void *store;                            /* store function */
 116         int option;                             /* function argument */
 117         struct applesmc_dev_attr *nodes;        /* dynamic node array */
 118 };
 119
 120 /* AppleSMC entry - cached register information */
 121 struct applesmc_entry {
 122         char key[5];            /* four-letter key code */
 123         u8 valid;               /* set when entry is successfully read once */
 124         u8 len;                 /* bounded by APPLESMC_MAX_DATA_LENGTH */
 125         char type[5];           /* four-letter type code */
 126         u8 flags;               /* 0x10: func; 0x40: write; 0x80: read */
 127 };
 128
 129 /* Register lookup and registers common to all SMCs */
 130 static struct applesmc_registers {
 131         struct mutex mutex;             /* register read/write mutex */
 132         unsigned int key_count;         /* number of SMC registers */
 133         unsigned int fan_count;         /* number of fans */
 134         unsigned int temp_count;        /* number of temperature registers */
 135         unsigned int temp_begin;        /* temperature lower index bound */
 136         unsigned int temp_end;          /* temperature upper index bound */
 137         unsigned int index_count;       /* size of temperature index array */
 138         int num_light_sensors;          /* number of light sensors */
 139         bool has_accelerometer;         /* has motion sensor */
 140         bool has_key_backlight;         /* has keyboard backlight */
 141         bool init_complete;             /* true when fully initialized */
 142         struct applesmc_entry *cache;   /* cached key entries */
 143         const char **index;             /* temperature key index */
 144 } smcreg = {
 145         .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
 146 };
 147
 148 static const int debug;
 149 static struct platform_device *pdev;
 150 static s16 rest_x;
 151 static s16 rest_y;
 152 static u8 backlight_state[2];
 153
 154 static struct device *hwmon_dev;
 155 static struct input_polled_dev *applesmc_idev;
 156
 157 /*
 158  * Last index written to key_at_index sysfs file, and value to use for all other
 159  * key_at_index_* sysfs files.
 160  */
 161 static unsigned int key_at_index;
 162
 163 static struct workqueue_struct *applesmc_led_wq;
 164
 165 /*
 166  * wait_read - Wait for a byte to appear on SMC port. Callers must
 167  * hold applesmc_lock.
 168  */
 169 static int wait_read(void)
 170 {
 171         u8 status;
 172         int us;
 173         for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
 174                 udelay(us);
 175                 status = inb(APPLESMC_CMD_PORT);
 176                 /* read: wait for smc to settle */
 177                 if (status & 0x01)
 178                         return 0;
 179         }
 180
 181         pr_warn("wait_read() fail: 0x%02x\n", status);
 182         return -EIO;
 183 }
 184
 185 /*
 186  * send_byte - Write to SMC port, retrying when necessary. Callers
 187  * must hold applesmc_lock.
 188  */
 189 static int send_byte(u8 cmd, u16 port)
 190 {
 191         u8 status;
 192         int us;
 193
 194         outb(cmd, port);
 195         for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
 196                 udelay(us);
 197                 status = inb(APPLESMC_CMD_PORT);
 198                 /* write: wait for smc to settle */
 199                 if (status & 0x02)
 200                         continue;
 201                 /* ready: cmd accepted, return */
 202                 if (status & 0x04)
 203                         return 0;
 204                 /* timeout: give up */
 205                 if (us << 1 == APPLESMC_MAX_WAIT)
 206                         break;
 207                 /* busy: long wait and resend */
 208                 udelay(APPLESMC_RETRY_WAIT);
 209                 outb(cmd, port);
 210         }
 211
 212         pr_warn("send_byte(0x%02x, 0x%04x) fail: 0x%02x\n", cmd, port, status);
 213         return -EIO;
 214 }
 215
 216 static int send_command(u8 cmd)
 217 {
 218         return send_byte(cmd, APPLESMC_CMD_PORT);
 219 }
 220
 221 static int send_argument(const char *key)
 222 {
 223         int i;
 224
 225         for (i = 0; i < 4; i++)
 226                 if (send_byte(key[i], APPLESMC_DATA_PORT))
 227                         return -EIO;
 228         return 0;
 229 }
 230
 231 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
 232 {
 233         int i;
 234
 235         if (send_command(cmd) || send_argument(key)) {
 236                 pr_warn("%.4s: read arg fail\n", key);
 237                 return -EIO;
 238         }
 239
 240         if (send_byte(len, APPLESMC_DATA_PORT)) {
 241                 pr_warn("%.4s: read len fail\n", key);
 242                 return -EIO;
 243         }
 244
 245         for (i = 0; i < len; i++) {
 246                 if (wait_read()) {
 247                         pr_warn("%.4s: read data[%d] fail\n", key, i);
 248                         return -EIO;
 249                 }
 250                 buffer[i] = inb(APPLESMC_DATA_PORT);
 251         }
 252
 253         return 0;
 254 }
 255
 256 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
 257 {
 258         int i;
 259
 260         if (send_command(cmd) || send_argument(key)) {
 261                 pr_warn("%s: write arg fail\n", key);
 262                 return -EIO;
 263         }
 264
 265         if (send_byte(len, APPLESMC_DATA_PORT)) {
 266                 pr_warn("%.4s: write len fail\n", key);
 267                 return -EIO;
 268         }
 269
 270         for (i = 0; i < len; i++) {
 271                 if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
 272                         pr_warn("%s: write data fail\n", key);
 273                         return -EIO;
 274                 }
 275         }
 276
 277         return 0;
 278 }
 279
 280 static int read_register_count(unsigned int *count)
 281 {
 282         __be32 be;
 283         int ret;
 284
 285         ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
 286         if (ret)
 287                 return ret;
 288
 289         *count = be32_to_cpu(be);
 290         return 0;
 291 }
 292
 293 /*
 294  * Serialized I/O
 295  *
 296  * Returns zero on success or a negative error on failure.
 297  * All functions below are concurrency safe - callers should NOT hold lock.
 298  */
 299
 300 static int applesmc_read_entry(const struct applesmc_entry *entry,
 301                                u8 *buf, u8 len)
 302 {
 303         int ret;
 304
 305         if (entry->len != len)
 306                 return -EINVAL;
 307         mutex_lock(&smcreg.mutex);
 308         ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
 309         mutex_unlock(&smcreg.mutex);
 310
 311         return ret;
 312 }
 313
 314 static int applesmc_write_entry(const struct applesmc_entry *entry,
 315                                 const u8 *buf, u8 len)
 316 {
 317         int ret;
 318
 319         if (entry->len != len)
 320                 return -EINVAL;
 321         mutex_lock(&smcreg.mutex);
 322         ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
 323         mutex_unlock(&smcreg.mutex);
 324         return ret;
 325 }
 326
 327 static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
 328 {
 329         struct applesmc_entry *cache = &smcreg.cache[index];
 330         u8 key[4], info[6];
 331         __be32 be;
 332         int ret = 0;
 333
 334         if (cache->valid)
 335                 return cache;
 336
 337         mutex_lock(&smcreg.mutex);
 338
 339         if (cache->valid)
 340                 goto out;
 341         be = cpu_to_be32(index);
 342         ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
 343         if (ret)
 344                 goto out;
 345         ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
 346         if (ret)
 347                 goto out;
 348
 349         memcpy(cache->key, key, 4);
 350         cache->len = info[0];
 351         memcpy(cache->type, &info[1], 4);
 352         cache->flags = info[5];
 353         cache->valid = 1;
 354
 355 out:
 356         mutex_unlock(&smcreg.mutex);
 357         if (ret)
 358                 return ERR_PTR(ret);
 359         return cache;
 360 }
 361
 362 static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
 363 {
 364         int begin = 0, end = smcreg.key_count;
 365         const struct applesmc_entry *entry;
 366
 367         while (begin != end) {
 368                 int middle = begin + (end - begin) / 2;
 369                 entry = applesmc_get_entry_by_index(middle);
 370                 if (IS_ERR(entry)) {
 371                         *lo = 0;
 372                         return PTR_ERR(entry);
 373                 }
 374                 if (strcmp(entry->key, key) < 0)
 375                         begin = middle + 1;
 376                 else
 377                         end = middle;
 378         }
 379
 380         *lo = begin;
 381         return 0;
 382 }
 383
 384 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
 385 {
 386         int begin = 0, end = smcreg.key_count;
 387         const struct applesmc_entry *entry;
 388
 389         while (begin != end) {
 390                 int middle = begin + (end - begin) / 2;
 391                 entry = applesmc_get_entry_by_index(middle);
 392                 if (IS_ERR(entry)) {
 393                         *hi = smcreg.key_count;
 394                         return PTR_ERR(entry);
 395                 }
 396                 if (strcmp(key, entry->key) < 0)
 397                         end = middle;
 398                 else
 399                         begin = middle + 1;
 400         }
 401
 402         *hi = begin;
 403         return 0;
 404 }
 405
 406 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
 407 {
 408         int begin, end;
 409         int ret;
 410
 411         ret = applesmc_get_lower_bound(&begin, key);
 412         if (ret)
 413                 return ERR_PTR(ret);
 414         ret = applesmc_get_upper_bound(&end, key);
 415         if (ret)
 416                 return ERR_PTR(ret);
 417         if (end - begin != 1)
 418                 return ERR_PTR(-EINVAL);
 419
 420         return applesmc_get_entry_by_index(begin);
 421 }
 422
 423 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
 424 {
 425         const struct applesmc_entry *entry;
 426
 427         entry = applesmc_get_entry_by_key(key);
 428         if (IS_ERR(entry))
 429                 return PTR_ERR(entry);
 430
 431         return applesmc_read_entry(entry, buffer, len);
 432 }
 433
 434 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
 435 {
 436         const struct applesmc_entry *entry;
 437
 438         entry = applesmc_get_entry_by_key(key);
 439         if (IS_ERR(entry))
 440                 return PTR_ERR(entry);
 441
 442         return applesmc_write_entry(entry, buffer, len);
 443 }
 444
 445 static int applesmc_has_key(const char *key, bool *value)
 446 {
 447         const struct applesmc_entry *entry;
 448
 449         entry = applesmc_get_entry_by_key(key);
 450         if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
 451                 return PTR_ERR(entry);
 452
 453         *value = !IS_ERR(entry);
 454         return 0;
 455 }
 456
 457 /*
 458  * applesmc_read_s16 - Read 16-bit signed big endian register
 459  */
 460 static int applesmc_read_s16(const char *key, s16 *value)
 461 {
 462         u8 buffer[2];
 463         int ret;
 464
 465         ret = applesmc_read_key(key, buffer, 2);
 466         if (ret)
 467                 return ret;
 468
 469         *value = ((s16)buffer[0] << 8) | buffer[1];
 470         return 0;
 471 }
 472
 473 /*
 474  * applesmc_device_init - initialize the accelerometer.  Can sleep.
 475  */
 476 static void applesmc_device_init(void)
 477 {
 478         int total;
 479         u8 buffer[2];
 480
 481         if (!smcreg.has_accelerometer)
 482                 return;
 483
 484         for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
 485                 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
 486                                 (buffer[0] != 0x00 || buffer[1] != 0x00))
 487                         return;
 488                 buffer[0] = 0xe0;
 489                 buffer[1] = 0x00;
 490                 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
 491                 msleep(INIT_WAIT_MSECS);
 492         }
 493
 494         pr_warn("failed to init the device\n");
 495 }
 496
 497 static int applesmc_init_index(struct applesmc_registers *s)
 498 {
 499         const struct applesmc_entry *entry;
 500         unsigned int i;
 501
 502         if (s->index)
 503                 return 0;
 504
 505         s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
 506         if (!s->index)
 507                 return -ENOMEM;
 508
 509         for (i = s->temp_begin; i < s->temp_end; i++) {
 510                 entry = applesmc_get_entry_by_index(i);
 511                 if (IS_ERR(entry))
 512                         continue;
 513                 if (strcmp(entry->type, TEMP_SENSOR_TYPE))
 514                         continue;
 515                 s->index[s->index_count++] = entry->key;
 516         }
 517
 518         return 0;
 519 }
 520
 521 /*
 522  * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
 523  */
 524 static int applesmc_init_smcreg_try(void)
 525 {
 526         struct applesmc_registers *s = &smcreg;
 527         bool left_light_sensor, right_light_sensor;
 528         u8 tmp[1];
 529         int ret;
 530
 531         if (s->init_complete)
 532                 return 0;
 533
 534         ret = read_register_count(&s->key_count);
 535         if (ret)
 536                 return ret;
 537
 538         if (!s->cache)
 539                 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
 540         if (!s->cache)
 541                 return -ENOMEM;
 542
 543         ret = applesmc_read_key(FANS_COUNT, tmp, 1);
 544         if (ret)
 545                 return ret;
 546         s->fan_count = tmp[0];
 547
 548         ret = applesmc_get_lower_bound(&s->temp_begin, "T");
 549         if (ret)
 550                 return ret;
 551         ret = applesmc_get_lower_bound(&s->temp_end, "U");
 552         if (ret)
 553                 return ret;
 554         s->temp_count = s->temp_end - s->temp_begin;
 555
 556         ret = applesmc_init_index(s);
 557         if (ret)
 558                 return ret;
 559
 560         ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
 561         if (ret)
 562                 return ret;
 563         ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
 564         if (ret)
 565                 return ret;
 566         ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
 567         if (ret)
 568                 return ret;
 569         ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
 570         if (ret)
 571                 return ret;
 572
 573         s->num_light_sensors = left_light_sensor + right_light_sensor;
 574         s->init_complete = true;
 575
 576         pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
 577                s->key_count, s->fan_count, s->temp_count, s->index_count,
 578                s->has_accelerometer,
 579                s->num_light_sensors,
 580                s->has_key_backlight);
 581
 582         return 0;
 583 }
 584
 585 static void applesmc_destroy_smcreg(void)
 586 {
 587         kfree(smcreg.index);
 588         smcreg.index = NULL;
 589         kfree(smcreg.cache);
 590         smcreg.cache = NULL;
 591         smcreg.init_complete = false;
 592 }
 593
 594 /*
 595  * applesmc_init_smcreg - Initialize register cache.
 596  *
 597  * Retries until initialization is successful, or the operation times out.
 598  *
 599  */
 600 static int applesmc_init_smcreg(void)
 601 {
 602         int ms, ret;
 603
 604         for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
 605                 ret = applesmc_init_smcreg_try();
 606                 if (!ret) {
 607                         if (ms)
 608                                 pr_info("init_smcreg() took %d ms\n", ms);
 609                         return 0;
 610                 }
 611                 msleep(INIT_WAIT_MSECS);
 612         }
 613
 614         applesmc_destroy_smcreg();
 615
 616         return ret;
 617 }
 618
 619 /* Device model stuff */
 620 static int applesmc_probe(struct platform_device *dev)
 621 {
 622         int ret;
 623
 624         ret = applesmc_init_smcreg();
 625         if (ret)
 626                 return ret;
 627
 628         applesmc_device_init();
 629
 630         return 0;
 631 }
 632
 633 /* Synchronize device with memorized backlight state */
 634 static int applesmc_pm_resume(struct device *dev)
 635 {
 636         if (smcreg.has_key_backlight)
 637                 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
 638         return 0;
 639 }
 640
 641 /* Reinitialize device on resume from hibernation */
 642 static int applesmc_pm_restore(struct device *dev)
 643 {
 644         applesmc_device_init();
 645         return applesmc_pm_resume(dev);
 646 }
 647
 648 static const struct dev_pm_ops applesmc_pm_ops = {
 649         .resume = applesmc_pm_resume,
 650         .restore = applesmc_pm_restore,
 651 };
 652
 653 static struct platform_driver applesmc_driver = {
 654         .probe = applesmc_probe,
 655         .driver = {
 656                 .name = "applesmc",
 657                 .owner = THIS_MODULE,
 658                 .pm = &applesmc_pm_ops,
 659         },
 660 };
 661
 662 /*
 663  * applesmc_calibrate - Set our "resting" values.  Callers must
 664  * hold applesmc_lock.
 665  */
 666 static void applesmc_calibrate(void)
 667 {
 668         applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
 669         applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
 670         rest_x = -rest_x;
 671 }
 672
 673 static void applesmc_idev_poll(struct input_polled_dev *dev)
 674 {
 675         struct input_dev *idev = dev->input;
 676         s16 x, y;
 677
 678         if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
 679                 return;
 680         if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
 681                 return;
 682
 683         x = -x;
 684         input_report_abs(idev, ABS_X, x - rest_x);
 685         input_report_abs(idev, ABS_Y, y - rest_y);
 686         input_sync(idev);
 687 }
 688
 689 /* Sysfs Files */
 690
 691 static ssize_t applesmc_name_show(struct device *dev,
 692                                    struct device_attribute *attr, char *buf)
 693 {
 694         return snprintf(buf, PAGE_SIZE, "applesmc\n");
 695 }
 696
 697 static ssize_t applesmc_position_show(struct device *dev,
 698                                    struct device_attribute *attr, char *buf)
 699 {
 700         int ret;
 701         s16 x, y, z;
 702
 703         ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
 704         if (ret)
 705                 goto out;
 706         ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
 707         if (ret)
 708                 goto out;
 709         ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
 710         if (ret)
 711                 goto out;
 712
 713 out:
 714         if (ret)
 715                 return ret;
 716         else
 717                 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
 718 }
 719
 720 static ssize_t applesmc_light_show(struct device *dev,
 721                                 struct device_attribute *attr, char *sysfsbuf)
 722 {
 723         const struct applesmc_entry *entry;
 724         static int data_length;
 725         int ret;
 726         u8 left = 0, right = 0;
 727         u8 buffer[10];
 728
 729         if (!data_length) {
 730                 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
 731                 if (IS_ERR(entry))
 732                         return PTR_ERR(entry);
 733                 if (entry->len > 10)
 734                         return -ENXIO;
 735                 data_length = entry->len;
 736                 pr_info("light sensor data length set to %d\n", data_length);
 737         }
 738
 739         ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
 740         /* newer macbooks report a single 10-bit bigendian value */
 741         if (data_length == 10) {
 742                 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
 743                 goto out;
 744         }
 745         left = buffer[2];
 746         if (ret)
 747                 goto out;
 748         ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
 749         right = buffer[2];
 750
 751 out:
 752         if (ret)
 753                 return ret;
 754         else
 755                 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
 756 }
 757
 758 /* Displays sensor key as label */
 759 static ssize_t applesmc_show_sensor_label(struct device *dev,
 760                         struct device_attribute *devattr, char *sysfsbuf)
 761 {
 762         const char *key = smcreg.index[to_index(devattr)];
 763
 764         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
 765 }
 766
 767 /* Displays degree Celsius * 1000 */
 768 static ssize_t applesmc_show_temperature(struct device *dev,
 769                         struct device_attribute *devattr, char *sysfsbuf)
 770 {
 771         const char *key = smcreg.index[to_index(devattr)];
 772         int ret;
 773         s16 value;
 774         int temp;
 775
 776         ret = applesmc_read_s16(key, &value);
 777         if (ret)
 778                 return ret;
 779
 780         temp = 250 * (value >> 6);
 781
 782         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp);
 783 }
 784
 785 static ssize_t applesmc_show_fan_speed(struct device *dev,
 786                                 struct device_attribute *attr, char *sysfsbuf)
 787 {
 788         int ret;
 789         unsigned int speed = 0;
 790         char newkey[5];
 791         u8 buffer[2];
 792
 793         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
 794
 795         ret = applesmc_read_key(newkey, buffer, 2);
 796         speed = ((buffer[0] << 8 | buffer[1]) >> 2);
 797
 798         if (ret)
 799                 return ret;
 800         else
 801                 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
 802 }
 803
 804 static ssize_t applesmc_store_fan_speed(struct device *dev,
 805                                         struct device_attribute *attr,
 806                                         const char *sysfsbuf, size_t count)
 807 {
 808         int ret;
 809         unsigned long speed;
 810         char newkey[5];
 811         u8 buffer[2];
 812
 813         if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
 814                 return -EINVAL;         /* Bigger than a 14-bit value */
 815
 816         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
 817
 818         buffer[0] = (speed >> 6) & 0xff;
 819         buffer[1] = (speed << 2) & 0xff;
 820         ret = applesmc_write_key(newkey, buffer, 2);
 821
 822         if (ret)
 823                 return ret;
 824         else
 825                 return count;
 826 }
 827
 828 static ssize_t applesmc_show_fan_manual(struct device *dev,
 829                         struct device_attribute *attr, char *sysfsbuf)
 830 {
 831         int ret;
 832         u16 manual = 0;
 833         u8 buffer[2];
 834
 835         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 836         manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
 837
 838         if (ret)
 839                 return ret;
 840         else
 841                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
 842 }
 843
 844 static ssize_t applesmc_store_fan_manual(struct device *dev,
 845                                          struct device_attribute *attr,
 846                                          const char *sysfsbuf, size_t count)
 847 {
 848         int ret;
 849         u8 buffer[2];
 850         unsigned long input;
 851         u16 val;
 852
 853         if (kstrtoul(sysfsbuf, 10, &input) < 0)
 854                 return -EINVAL;
 855
 856         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 857         val = (buffer[0] << 8 | buffer[1]);
 858         if (ret)
 859                 goto out;
 860
 861         if (input)
 862                 val = val | (0x01 << to_index(attr));
 863         else
 864                 val = val & ~(0x01 << to_index(attr));
 865
 866         buffer[0] = (val >> 8) & 0xFF;
 867         buffer[1] = val & 0xFF;
 868
 869         ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
 870
 871 out:
 872         if (ret)
 873                 return ret;
 874         else
 875                 return count;
 876 }
 877
 878 static ssize_t applesmc_show_fan_position(struct device *dev,
 879                                 struct device_attribute *attr, char *sysfsbuf)
 880 {
 881         int ret;
 882         char newkey[5];
 883         u8 buffer[17];
 884
 885         sprintf(newkey, FAN_ID_FMT, to_index(attr));
 886
 887         ret = applesmc_read_key(newkey, buffer, 16);
 888         buffer[16] = 0;
 889
 890         if (ret)
 891                 return ret;
 892         else
 893                 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
 894 }
 895
 896 static ssize_t applesmc_calibrate_show(struct device *dev,
 897                                 struct device_attribute *attr, char *sysfsbuf)
 898 {
 899         return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
 900 }
 901
 902 static ssize_t applesmc_calibrate_store(struct device *dev,
 903         struct device_attribute *attr, const char *sysfsbuf, size_t count)
 904 {
 905         applesmc_calibrate();
 906
 907         return count;
 908 }
 909
 910 static void applesmc_backlight_set(struct work_struct *work)
 911 {
 912         applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
 913 }
 914 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
 915
 916 static void applesmc_brightness_set(struct led_classdev *led_cdev,
 917                                                 enum led_brightness value)
 918 {
 919         int ret;
 920
 921         backlight_state[0] = value;
 922         ret = queue_work(applesmc_led_wq, &backlight_work);
 923
 924         if (debug && (!ret))
 925                 printk(KERN_DEBUG "applesmc: work was already on the queue.\n");
 926 }
 927
 928 static ssize_t applesmc_key_count_show(struct device *dev,
 929                                 struct device_attribute *attr, char *sysfsbuf)
 930 {
 931         int ret;
 932         u8 buffer[4];
 933         u32 count;
 934
 935         ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
 936         count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
 937                                                 ((u32)buffer[2]<<8) + buffer[3];
 938
 939         if (ret)
 940                 return ret;
 941         else
 942                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
 943 }
 944
 945 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
 946                                 struct device_attribute *attr, char *sysfsbuf)
 947 {
 948         const struct applesmc_entry *entry;
 949         int ret;
 950
 951         entry = applesmc_get_entry_by_index(key_at_index);
 952         if (IS_ERR(entry))
 953                 return PTR_ERR(entry);
 954         ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
 955         if (ret)
 956                 return ret;
 957
 958         return entry->len;
 959 }
 960
 961 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
 962                                 struct device_attribute *attr, char *sysfsbuf)
 963 {
 964         const struct applesmc_entry *entry;
 965
 966         entry = applesmc_get_entry_by_index(key_at_index);
 967         if (IS_ERR(entry))
 968                 return PTR_ERR(entry);
 969
 970         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
 971 }
 972
 973 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
 974                                 struct device_attribute *attr, char *sysfsbuf)
 975 {
 976         const struct applesmc_entry *entry;
 977
 978         entry = applesmc_get_entry_by_index(key_at_index);
 979         if (IS_ERR(entry))
 980                 return PTR_ERR(entry);
 981
 982         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
 983 }
 984
 985 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
 986                                 struct device_attribute *attr, char *sysfsbuf)
 987 {
 988         const struct applesmc_entry *entry;
 989
 990         entry = applesmc_get_entry_by_index(key_at_index);
 991         if (IS_ERR(entry))
 992                 return PTR_ERR(entry);
 993
 994         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
 995 }
 996
 997 static ssize_t applesmc_key_at_index_show(struct device *dev,
 998                                 struct device_attribute *attr, char *sysfsbuf)
 999 {
1000         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
1001 }
1002
1003 static ssize_t applesmc_key_at_index_store(struct device *dev,
1004         struct device_attribute *attr, const char *sysfsbuf, size_t count)
1005 {
1006         unsigned long newkey;
1007
1008         if (kstrtoul(sysfsbuf, 10, &newkey) < 0
1009             || newkey >= smcreg.key_count)
1010                 return -EINVAL;
1011
1012         key_at_index = newkey;
1013         return count;
1014 }
1015
1016 static struct led_classdev applesmc_backlight = {
1017         .name                   = "smc::kbd_backlight",
1018         .default_trigger        = "nand-disk",
1019         .brightness_set         = applesmc_brightness_set,
1020 };
1021
1022 static struct applesmc_node_group info_group[] = {
1023         { "name", applesmc_name_show },
1024         { "key_count", applesmc_key_count_show },
1025         { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1026         { "key_at_index_name", applesmc_key_at_index_name_show },
1027         { "key_at_index_type", applesmc_key_at_index_type_show },
1028         { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1029         { "key_at_index_data", applesmc_key_at_index_read_show },
1030         { }
1031 };
1032
1033 static struct applesmc_node_group accelerometer_group[] = {
1034         { "position", applesmc_position_show },
1035         { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1036         { }
1037 };
1038
1039 static struct applesmc_node_group light_sensor_group[] = {
1040         { "light", applesmc_light_show },
1041         { }
1042 };
1043
1044 static struct applesmc_node_group fan_group[] = {
1045         { "fan%d_label", applesmc_show_fan_position },
1046         { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1047         { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1048         { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1049         { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1050         { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1051         { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1052         { }
1053 };
1054
1055 static struct applesmc_node_group temp_group[] = {
1056         { "temp%d_label", applesmc_show_sensor_label },
1057         { "temp%d_input", applesmc_show_temperature },
1058         { }
1059 };
1060
1061 /* Module stuff */
1062
1063 /*
1064  * applesmc_destroy_nodes - remove files and free associated memory
1065  */
1066 static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1067 {
1068         struct applesmc_node_group *grp;
1069         struct applesmc_dev_attr *node;
1070
1071         for (grp = groups; grp->nodes; grp++) {
1072                 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1073                         sysfs_remove_file(&pdev->dev.kobj,
1074                                           &node->sda.dev_attr.attr);
1075                 kfree(grp->nodes);
1076                 grp->nodes = NULL;
1077         }
1078 }
1079
1080 /*
1081  * applesmc_create_nodes - create a two-dimensional group of sysfs files
1082  */
1083 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1084 {
1085         struct applesmc_node_group *grp;
1086         struct applesmc_dev_attr *node;
1087         struct attribute *attr;
1088         int ret, i;
1089
1090         for (grp = groups; grp->format; grp++) {
1091                 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1092                 if (!grp->nodes) {
1093                         ret = -ENOMEM;
1094                         goto out;
1095                 }
1096                 for (i = 0; i < num; i++) {
1097                         node = &grp->nodes[i];
1098                         sprintf(node->name, grp->format, i + 1);
1099                         node->sda.index = (grp->option << 16) | (i & 0xffff);
1100                         node->sda.dev_attr.show = grp->show;
1101                         node->sda.dev_attr.store = grp->store;
1102                         attr = &node->sda.dev_attr.attr;
1103                         sysfs_attr_init(attr);
1104                         attr->name = node->name;
1105                         attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
1106                         ret = sysfs_create_file(&pdev->dev.kobj, attr);
1107                         if (ret) {
1108                                 attr->name = NULL;
1109                                 goto out;
1110                         }
1111                 }
1112         }
1113
1114         return 0;
1115 out:
1116         applesmc_destroy_nodes(groups);
1117         return ret;
1118 }
1119
1120 /* Create accelerometer ressources */
1121 static int applesmc_create_accelerometer(void)
1122 {
1123         struct input_dev *idev;
1124         int ret;
1125
1126         if (!smcreg.has_accelerometer)
1127                 return 0;
1128
1129         ret = applesmc_create_nodes(accelerometer_group, 1);
1130         if (ret)
1131                 goto out;
1132
1133         applesmc_idev = input_allocate_polled_device();
1134         if (!applesmc_idev) {
1135                 ret = -ENOMEM;
1136                 goto out_sysfs;
1137         }
1138
1139         applesmc_idev->poll = applesmc_idev_poll;
1140         applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
1141
1142         /* initial calibrate for the input device */
1143         applesmc_calibrate();
1144
1145         /* initialize the input device */
1146         idev = applesmc_idev->input;
1147         idev->name = "applesmc";
1148         idev->id.bustype = BUS_HOST;
1149         idev->dev.parent = &pdev->dev;
1150         idev->evbit[0] = BIT_MASK(EV_ABS);
1151         input_set_abs_params(idev, ABS_X,
1152                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1153         input_set_abs_params(idev, ABS_Y,
1154                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1155
1156         ret = input_register_polled_device(applesmc_idev);
1157         if (ret)
1158                 goto out_idev;
1159
1160         return 0;
1161
1162 out_idev:
1163         input_free_polled_device(applesmc_idev);
1164
1165 out_sysfs:
1166         applesmc_destroy_nodes(accelerometer_group);
1167
1168 out:
1169         pr_warn("driver init failed (ret=%d)!\n", ret);
1170         return ret;
1171 }
1172
1173 /* Release all ressources used by the accelerometer */
1174 static void applesmc_release_accelerometer(void)
1175 {
1176         if (!smcreg.has_accelerometer)
1177                 return;
1178         input_unregister_polled_device(applesmc_idev);
1179         input_free_polled_device(applesmc_idev);
1180         applesmc_destroy_nodes(accelerometer_group);
1181 }
1182
1183 static int applesmc_create_light_sensor(void)
1184 {
1185         if (!smcreg.num_light_sensors)
1186                 return 0;
1187         return applesmc_create_nodes(light_sensor_group, 1);
1188 }
1189
1190 static void applesmc_release_light_sensor(void)
1191 {
1192         if (!smcreg.num_light_sensors)
1193                 return;
1194         applesmc_destroy_nodes(light_sensor_group);
1195 }
1196
1197 static int applesmc_create_key_backlight(void)
1198 {
1199         if (!smcreg.has_key_backlight)
1200                 return 0;
1201         applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1202         if (!applesmc_led_wq)
1203                 return -ENOMEM;
1204         return led_classdev_register(&pdev->dev, &applesmc_backlight);
1205 }
1206
1207 static void applesmc_release_key_backlight(void)
1208 {
1209         if (!smcreg.has_key_backlight)
1210                 return;
1211         led_classdev_unregister(&applesmc_backlight);
1212         destroy_workqueue(applesmc_led_wq);
1213 }
1214
1215 static int applesmc_dmi_match(const struct dmi_system_id *id)
1216 {
1217         return 1;
1218 }
1219
1220 /*
1221  * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1222  * So we need to put "Apple MacBook Pro" before "Apple MacBook".
1223  */
1224 static __initdata struct dmi_system_id applesmc_whitelist[] = {
1225         { applesmc_dmi_match, "Apple MacBook Air", {
1226           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1227           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1228         },
1229         { applesmc_dmi_match, "Apple MacBook Pro", {
1230           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1231           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1232         },
1233         { applesmc_dmi_match, "Apple MacBook", {
1234           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1235           DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1236         },
1237         { applesmc_dmi_match, "Apple Macmini", {
1238           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1239           DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1240         },
1241         { applesmc_dmi_match, "Apple MacPro", {
1242           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1243           DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1244         },
1245         { applesmc_dmi_match, "Apple iMac", {
1246           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1247           DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1248         },
1249         { .ident = NULL }
1250 };
1251
1252 static int __init applesmc_init(void)
1253 {
1254         int ret;
1255
1256         if (!dmi_check_system(applesmc_whitelist)) {
1257                 pr_warn("supported laptop not found!\n");
1258                 ret = -ENODEV;
1259                 goto out;
1260         }
1261
1262         if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1263                                                                 "applesmc")) {
1264                 ret = -ENXIO;
1265                 goto out;
1266         }
1267
1268         ret = platform_driver_register(&applesmc_driver);
1269         if (ret)
1270                 goto out_region;
1271
1272         pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1273                                                NULL, 0);
1274         if (IS_ERR(pdev)) {
1275                 ret = PTR_ERR(pdev);
1276                 goto out_driver;
1277         }
1278
1279         /* create register cache */
1280         ret = applesmc_init_smcreg();
1281         if (ret)
1282                 goto out_device;
1283
1284         ret = applesmc_create_nodes(info_group, 1);
1285         if (ret)
1286                 goto out_smcreg;
1287
1288         ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1289         if (ret)
1290                 goto out_info;
1291
1292         ret = applesmc_create_nodes(temp_group, smcreg.index_count);
1293         if (ret)
1294                 goto out_fans;
1295
1296         ret = applesmc_create_accelerometer();
1297         if (ret)
1298                 goto out_temperature;
1299
1300         ret = applesmc_create_light_sensor();
1301         if (ret)
1302                 goto out_accelerometer;
1303
1304         ret = applesmc_create_key_backlight();
1305         if (ret)
1306                 goto out_light_sysfs;
1307
1308         hwmon_dev = hwmon_device_register(&pdev->dev);
1309         if (IS_ERR(hwmon_dev)) {
1310                 ret = PTR_ERR(hwmon_dev);
1311                 goto out_light_ledclass;
1312         }
1313
1314         return 0;
1315
1316 out_light_ledclass:
1317         applesmc_release_key_backlight();
1318 out_light_sysfs:
1319         applesmc_release_light_sensor();
1320 out_accelerometer:
1321         applesmc_release_accelerometer();
1322 out_temperature:
1323         applesmc_destroy_nodes(temp_group);
1324 out_fans:
1325         applesmc_destroy_nodes(fan_group);
1326 out_info:
1327         applesmc_destroy_nodes(info_group);
1328 out_smcreg:
1329         applesmc_destroy_smcreg();
1330 out_device:
1331         platform_device_unregister(pdev);
1332 out_driver:
1333         platform_driver_unregister(&applesmc_driver);
1334 out_region:
1335         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1336 out:
1337         pr_warn("driver init failed (ret=%d)!\n", ret);
1338         return ret;
1339 }
1340
1341 static void __exit applesmc_exit(void)
1342 {
1343         hwmon_device_unregister(hwmon_dev);
1344         applesmc_release_key_backlight();
1345         applesmc_release_light_sensor();
1346         applesmc_release_accelerometer();
1347         applesmc_destroy_nodes(temp_group);
1348         applesmc_destroy_nodes(fan_group);
1349         applesmc_destroy_nodes(info_group);
1350         applesmc_destroy_smcreg();
1351         platform_device_unregister(pdev);
1352         platform_driver_unregister(&applesmc_driver);
1353         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1354 }
1355
1356 module_init(applesmc_init);
1357 module_exit(applesmc_exit);
1358
1359 MODULE_AUTHOR("Nicolas Boichat");
1360 MODULE_DESCRIPTION("Apple SMC");
1361 MODULE_LICENSE("GPL v2");
1362 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);