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         u8 status, data = 0;
 234         int i;
 235
 236         if (send_command(cmd) || send_argument(key)) {
 237                 pr_warn("%.4s: read arg fail\n", key);
 238                 return -EIO;
 239         }
 240
 241         /* This has no effect on newer (2012) SMCs */
 242         if (send_byte(len, APPLESMC_DATA_PORT)) {
 243                 pr_warn("%.4s: read len fail\n", key);
 244                 return -EIO;
 245         }
 246
 247         for (i = 0; i < len; i++) {
 248                 if (wait_read()) {
 249                         pr_warn("%.4s: read data[%d] fail\n", key, i);
 250                         return -EIO;
 251                 }
 252                 buffer[i] = inb(APPLESMC_DATA_PORT);
 253         }
 254
 255         /* Read the data port until bit0 is cleared */
 256         for (i = 0; i < 16; i++) {
 257                 udelay(APPLESMC_MIN_WAIT);
 258                 status = inb(APPLESMC_CMD_PORT);
 259                 if (!(status & 0x01))
 260                         break;
 261                 data = inb(APPLESMC_DATA_PORT);
 262         }
 263         if (i)
 264                 pr_warn("flushed %d bytes, last value is: %d\n", i, data);
 265
 266         return 0;
 267 }
 268
 269 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
 270 {
 271         int i;
 272
 273         if (send_command(cmd) || send_argument(key)) {
 274                 pr_warn("%s: write arg fail\n", key);
 275                 return -EIO;
 276         }
 277
 278         if (send_byte(len, APPLESMC_DATA_PORT)) {
 279                 pr_warn("%.4s: write len fail\n", key);
 280                 return -EIO;
 281         }
 282
 283         for (i = 0; i < len; i++) {
 284                 if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
 285                         pr_warn("%s: write data fail\n", key);
 286                         return -EIO;
 287                 }
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int read_register_count(unsigned int *count)
 294 {
 295         __be32 be;
 296         int ret;
 297
 298         ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
 299         if (ret)
 300                 return ret;
 301
 302         *count = be32_to_cpu(be);
 303         return 0;
 304 }
 305
 306 /*
 307  * Serialized I/O
 308  *
 309  * Returns zero on success or a negative error on failure.
 310  * All functions below are concurrency safe - callers should NOT hold lock.
 311  */
 312
 313 static int applesmc_read_entry(const struct applesmc_entry *entry,
 314                                u8 *buf, u8 len)
 315 {
 316         int ret;
 317
 318         if (entry->len != len)
 319                 return -EINVAL;
 320         mutex_lock(&smcreg.mutex);
 321         ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
 322         mutex_unlock(&smcreg.mutex);
 323
 324         return ret;
 325 }
 326
 327 static int applesmc_write_entry(const struct applesmc_entry *entry,
 328                                 const u8 *buf, u8 len)
 329 {
 330         int ret;
 331
 332         if (entry->len != len)
 333                 return -EINVAL;
 334         mutex_lock(&smcreg.mutex);
 335         ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
 336         mutex_unlock(&smcreg.mutex);
 337         return ret;
 338 }
 339
 340 static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
 341 {
 342         struct applesmc_entry *cache = &smcreg.cache[index];
 343         u8 key[4], info[6];
 344         __be32 be;
 345         int ret = 0;
 346
 347         if (cache->valid)
 348                 return cache;
 349
 350         mutex_lock(&smcreg.mutex);
 351
 352         if (cache->valid)
 353                 goto out;
 354         be = cpu_to_be32(index);
 355         ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
 356         if (ret)
 357                 goto out;
 358         ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
 359         if (ret)
 360                 goto out;
 361
 362         memcpy(cache->key, key, 4);
 363         cache->len = info[0];
 364         memcpy(cache->type, &info[1], 4);
 365         cache->flags = info[5];
 366         cache->valid = 1;
 367
 368 out:
 369         mutex_unlock(&smcreg.mutex);
 370         if (ret)
 371                 return ERR_PTR(ret);
 372         return cache;
 373 }
 374
 375 static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
 376 {
 377         int begin = 0, end = smcreg.key_count;
 378         const struct applesmc_entry *entry;
 379
 380         while (begin != end) {
 381                 int middle = begin + (end - begin) / 2;
 382                 entry = applesmc_get_entry_by_index(middle);
 383                 if (IS_ERR(entry)) {
 384                         *lo = 0;
 385                         return PTR_ERR(entry);
 386                 }
 387                 if (strcmp(entry->key, key) < 0)
 388                         begin = middle + 1;
 389                 else
 390                         end = middle;
 391         }
 392
 393         *lo = begin;
 394         return 0;
 395 }
 396
 397 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
 398 {
 399         int begin = 0, end = smcreg.key_count;
 400         const struct applesmc_entry *entry;
 401
 402         while (begin != end) {
 403                 int middle = begin + (end - begin) / 2;
 404                 entry = applesmc_get_entry_by_index(middle);
 405                 if (IS_ERR(entry)) {
 406                         *hi = smcreg.key_count;
 407                         return PTR_ERR(entry);
 408                 }
 409                 if (strcmp(key, entry->key) < 0)
 410                         end = middle;
 411                 else
 412                         begin = middle + 1;
 413         }
 414
 415         *hi = begin;
 416         return 0;
 417 }
 418
 419 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
 420 {
 421         int begin, end;
 422         int ret;
 423
 424         ret = applesmc_get_lower_bound(&begin, key);
 425         if (ret)
 426                 return ERR_PTR(ret);
 427         ret = applesmc_get_upper_bound(&end, key);
 428         if (ret)
 429                 return ERR_PTR(ret);
 430         if (end - begin != 1)
 431                 return ERR_PTR(-EINVAL);
 432
 433         return applesmc_get_entry_by_index(begin);
 434 }
 435
 436 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
 437 {
 438         const struct applesmc_entry *entry;
 439
 440         entry = applesmc_get_entry_by_key(key);
 441         if (IS_ERR(entry))
 442                 return PTR_ERR(entry);
 443
 444         return applesmc_read_entry(entry, buffer, len);
 445 }
 446
 447 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
 448 {
 449         const struct applesmc_entry *entry;
 450
 451         entry = applesmc_get_entry_by_key(key);
 452         if (IS_ERR(entry))
 453                 return PTR_ERR(entry);
 454
 455         return applesmc_write_entry(entry, buffer, len);
 456 }
 457
 458 static int applesmc_has_key(const char *key, bool *value)
 459 {
 460         const struct applesmc_entry *entry;
 461
 462         entry = applesmc_get_entry_by_key(key);
 463         if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
 464                 return PTR_ERR(entry);
 465
 466         *value = !IS_ERR(entry);
 467         return 0;
 468 }
 469
 470 /*
 471  * applesmc_read_s16 - Read 16-bit signed big endian register
 472  */
 473 static int applesmc_read_s16(const char *key, s16 *value)
 474 {
 475         u8 buffer[2];
 476         int ret;
 477
 478         ret = applesmc_read_key(key, buffer, 2);
 479         if (ret)
 480                 return ret;
 481
 482         *value = ((s16)buffer[0] << 8) | buffer[1];
 483         return 0;
 484 }
 485
 486 /*
 487  * applesmc_device_init - initialize the accelerometer.  Can sleep.
 488  */
 489 static void applesmc_device_init(void)
 490 {
 491         int total;
 492         u8 buffer[2];
 493
 494         if (!smcreg.has_accelerometer)
 495                 return;
 496
 497         for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
 498                 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
 499                                 (buffer[0] != 0x00 || buffer[1] != 0x00))
 500                         return;
 501                 buffer[0] = 0xe0;
 502                 buffer[1] = 0x00;
 503                 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
 504                 msleep(INIT_WAIT_MSECS);
 505         }
 506
 507         pr_warn("failed to init the device\n");
 508 }
 509
 510 static int applesmc_init_index(struct applesmc_registers *s)
 511 {
 512         const struct applesmc_entry *entry;
 513         unsigned int i;
 514
 515         if (s->index)
 516                 return 0;
 517
 518         s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
 519         if (!s->index)
 520                 return -ENOMEM;
 521
 522         for (i = s->temp_begin; i < s->temp_end; i++) {
 523                 entry = applesmc_get_entry_by_index(i);
 524                 if (IS_ERR(entry))
 525                         continue;
 526                 if (strcmp(entry->type, TEMP_SENSOR_TYPE))
 527                         continue;
 528                 s->index[s->index_count++] = entry->key;
 529         }
 530
 531         return 0;
 532 }
 533
 534 /*
 535  * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
 536  */
 537 static int applesmc_init_smcreg_try(void)
 538 {
 539         struct applesmc_registers *s = &smcreg;
 540         bool left_light_sensor = 0, right_light_sensor = 0;
 541         unsigned int count;
 542         u8 tmp[1];
 543         int ret;
 544
 545         if (s->init_complete)
 546                 return 0;
 547
 548         ret = read_register_count(&count);
 549         if (ret)
 550                 return ret;
 551
 552         if (s->cache && s->key_count != count) {
 553                 pr_warn("key count changed from %d to %d\n",
 554                         s->key_count, count);
 555                 kfree(s->cache);
 556                 s->cache = NULL;
 557         }
 558         s->key_count = count;
 559
 560         if (!s->cache)
 561                 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
 562         if (!s->cache)
 563                 return -ENOMEM;
 564
 565         ret = applesmc_read_key(FANS_COUNT, tmp, 1);
 566         if (ret)
 567                 return ret;
 568         s->fan_count = tmp[0];
 569         if (s->fan_count > 10)
 570                 s->fan_count = 10;
 571
 572         ret = applesmc_get_lower_bound(&s->temp_begin, "T");
 573         if (ret)
 574                 return ret;
 575         ret = applesmc_get_lower_bound(&s->temp_end, "U");
 576         if (ret)
 577                 return ret;
 578         s->temp_count = s->temp_end - s->temp_begin;
 579
 580         ret = applesmc_init_index(s);
 581         if (ret)
 582                 return ret;
 583
 584         ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
 585         if (ret)
 586                 return ret;
 587         ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
 588         if (ret)
 589                 return ret;
 590         ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
 591         if (ret)
 592                 return ret;
 593         ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
 594         if (ret)
 595                 return ret;
 596
 597         s->num_light_sensors = left_light_sensor + right_light_sensor;
 598         s->init_complete = true;
 599
 600         pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
 601                s->key_count, s->fan_count, s->temp_count, s->index_count,
 602                s->has_accelerometer,
 603                s->num_light_sensors,
 604                s->has_key_backlight);
 605
 606         return 0;
 607 }
 608
 609 static void applesmc_destroy_smcreg(void)
 610 {
 611         kfree(smcreg.index);
 612         smcreg.index = NULL;
 613         kfree(smcreg.cache);
 614         smcreg.cache = NULL;
 615         smcreg.init_complete = false;
 616 }
 617
 618 /*
 619  * applesmc_init_smcreg - Initialize register cache.
 620  *
 621  * Retries until initialization is successful, or the operation times out.
 622  *
 623  */
 624 static int applesmc_init_smcreg(void)
 625 {
 626         int ms, ret;
 627
 628         for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
 629                 ret = applesmc_init_smcreg_try();
 630                 if (!ret) {
 631                         if (ms)
 632                                 pr_info("init_smcreg() took %d ms\n", ms);
 633                         return 0;
 634                 }
 635                 msleep(INIT_WAIT_MSECS);
 636         }
 637
 638         applesmc_destroy_smcreg();
 639
 640         return ret;
 641 }
 642
 643 /* Device model stuff */
 644 static int applesmc_probe(struct platform_device *dev)
 645 {
 646         int ret;
 647
 648         ret = applesmc_init_smcreg();
 649         if (ret)
 650                 return ret;
 651
 652         applesmc_device_init();
 653
 654         return 0;
 655 }
 656
 657 /* Synchronize device with memorized backlight state */
 658 static int applesmc_pm_resume(struct device *dev)
 659 {
 660         if (smcreg.has_key_backlight)
 661                 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
 662         return 0;
 663 }
 664
 665 /* Reinitialize device on resume from hibernation */
 666 static int applesmc_pm_restore(struct device *dev)
 667 {
 668         applesmc_device_init();
 669         return applesmc_pm_resume(dev);
 670 }
 671
 672 static const struct dev_pm_ops applesmc_pm_ops = {
 673         .resume = applesmc_pm_resume,
 674         .restore = applesmc_pm_restore,
 675 };
 676
 677 static struct platform_driver applesmc_driver = {
 678         .probe = applesmc_probe,
 679         .driver = {
 680                 .name = "applesmc",
 681                 .pm = &applesmc_pm_ops,
 682         },
 683 };
 684
 685 /*
 686  * applesmc_calibrate - Set our "resting" values.  Callers must
 687  * hold applesmc_lock.
 688  */
 689 static void applesmc_calibrate(void)
 690 {
 691         applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
 692         applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
 693         rest_x = -rest_x;
 694 }
 695
 696 static void applesmc_idev_poll(struct input_polled_dev *dev)
 697 {
 698         struct input_dev *idev = dev->input;
 699         s16 x, y;
 700
 701         if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
 702                 return;
 703         if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
 704                 return;
 705
 706         x = -x;
 707         input_report_abs(idev, ABS_X, x - rest_x);
 708         input_report_abs(idev, ABS_Y, y - rest_y);
 709         input_sync(idev);
 710 }
 711
 712 /* Sysfs Files */
 713
 714 static ssize_t applesmc_name_show(struct device *dev,
 715                                    struct device_attribute *attr, char *buf)
 716 {
 717         return snprintf(buf, PAGE_SIZE, "applesmc\n");
 718 }
 719
 720 static ssize_t applesmc_position_show(struct device *dev,
 721                                    struct device_attribute *attr, char *buf)
 722 {
 723         int ret;
 724         s16 x, y, z;
 725
 726         ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
 727         if (ret)
 728                 goto out;
 729         ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
 730         if (ret)
 731                 goto out;
 732         ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
 733         if (ret)
 734                 goto out;
 735
 736 out:
 737         if (ret)
 738                 return ret;
 739         else
 740                 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
 741 }
 742
 743 static ssize_t applesmc_light_show(struct device *dev,
 744                                 struct device_attribute *attr, char *sysfsbuf)
 745 {
 746         const struct applesmc_entry *entry;
 747         static int data_length;
 748         int ret;
 749         u8 left = 0, right = 0;
 750         u8 buffer[10];
 751
 752         if (!data_length) {
 753                 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
 754                 if (IS_ERR(entry))
 755                         return PTR_ERR(entry);
 756                 if (entry->len > 10)
 757                         return -ENXIO;
 758                 data_length = entry->len;
 759                 pr_info("light sensor data length set to %d\n", data_length);
 760         }
 761
 762         ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
 763         /* newer macbooks report a single 10-bit bigendian value */
 764         if (data_length == 10) {
 765                 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
 766                 goto out;
 767         }
 768         left = buffer[2];
 769         if (ret)
 770                 goto out;
 771         ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
 772         right = buffer[2];
 773
 774 out:
 775         if (ret)
 776                 return ret;
 777         else
 778                 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
 779 }
 780
 781 /* Displays sensor key as label */
 782 static ssize_t applesmc_show_sensor_label(struct device *dev,
 783                         struct device_attribute *devattr, char *sysfsbuf)
 784 {
 785         const char *key = smcreg.index[to_index(devattr)];
 786
 787         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
 788 }
 789
 790 /* Displays degree Celsius * 1000 */
 791 static ssize_t applesmc_show_temperature(struct device *dev,
 792                         struct device_attribute *devattr, char *sysfsbuf)
 793 {
 794         const char *key = smcreg.index[to_index(devattr)];
 795         int ret;
 796         s16 value;
 797         int temp;
 798
 799         ret = applesmc_read_s16(key, &value);
 800         if (ret)
 801                 return ret;
 802
 803         temp = 250 * (value >> 6);
 804
 805         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp);
 806 }
 807
 808 static ssize_t applesmc_show_fan_speed(struct device *dev,
 809                                 struct device_attribute *attr, char *sysfsbuf)
 810 {
 811         int ret;
 812         unsigned int speed = 0;
 813         char newkey[5];
 814         u8 buffer[2];
 815
 816         scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
 817                   to_index(attr));
 818
 819         ret = applesmc_read_key(newkey, buffer, 2);
 820         speed = ((buffer[0] << 8 | buffer[1]) >> 2);
 821
 822         if (ret)
 823                 return ret;
 824         else
 825                 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
 826 }
 827
 828 static ssize_t applesmc_store_fan_speed(struct device *dev,
 829                                         struct device_attribute *attr,
 830                                         const char *sysfsbuf, size_t count)
 831 {
 832         int ret;
 833         unsigned long speed;
 834         char newkey[5];
 835         u8 buffer[2];
 836
 837         if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
 838                 return -EINVAL;         /* Bigger than a 14-bit value */
 839
 840         scnprintf(newkey, sizeof(newkey), fan_speed_fmt[to_option(attr)],
 841                   to_index(attr));
 842
 843         buffer[0] = (speed >> 6) & 0xff;
 844         buffer[1] = (speed << 2) & 0xff;
 845         ret = applesmc_write_key(newkey, buffer, 2);
 846
 847         if (ret)
 848                 return ret;
 849         else
 850                 return count;
 851 }
 852
 853 static ssize_t applesmc_show_fan_manual(struct device *dev,
 854                         struct device_attribute *attr, char *sysfsbuf)
 855 {
 856         int ret;
 857         u16 manual = 0;
 858         u8 buffer[2];
 859
 860         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 861         manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
 862
 863         if (ret)
 864                 return ret;
 865         else
 866                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
 867 }
 868
 869 static ssize_t applesmc_store_fan_manual(struct device *dev,
 870                                          struct device_attribute *attr,
 871                                          const char *sysfsbuf, size_t count)
 872 {
 873         int ret;
 874         u8 buffer[2];
 875         unsigned long input;
 876         u16 val;
 877
 878         if (kstrtoul(sysfsbuf, 10, &input) < 0)
 879                 return -EINVAL;
 880
 881         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 882         val = (buffer[0] << 8 | buffer[1]);
 883         if (ret)
 884                 goto out;
 885
 886         if (input)
 887                 val = val | (0x01 << to_index(attr));
 888         else
 889                 val = val & ~(0x01 << to_index(attr));
 890
 891         buffer[0] = (val >> 8) & 0xFF;
 892         buffer[1] = val & 0xFF;
 893
 894         ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
 895
 896 out:
 897         if (ret)
 898                 return ret;
 899         else
 900                 return count;
 901 }
 902
 903 static ssize_t applesmc_show_fan_position(struct device *dev,
 904                                 struct device_attribute *attr, char *sysfsbuf)
 905 {
 906         int ret;
 907         char newkey[5];
 908         u8 buffer[17];
 909
 910         scnprintf(newkey, sizeof(newkey), FAN_ID_FMT, to_index(attr));
 911
 912         ret = applesmc_read_key(newkey, buffer, 16);
 913         buffer[16] = 0;
 914
 915         if (ret)
 916                 return ret;
 917         else
 918                 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
 919 }
 920
 921 static ssize_t applesmc_calibrate_show(struct device *dev,
 922                                 struct device_attribute *attr, char *sysfsbuf)
 923 {
 924         return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
 925 }
 926
 927 static ssize_t applesmc_calibrate_store(struct device *dev,
 928         struct device_attribute *attr, const char *sysfsbuf, size_t count)
 929 {
 930         applesmc_calibrate();
 931
 932         return count;
 933 }
 934
 935 static void applesmc_backlight_set(struct work_struct *work)
 936 {
 937         applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
 938 }
 939 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
 940
 941 static void applesmc_brightness_set(struct led_classdev *led_cdev,
 942                                                 enum led_brightness value)
 943 {
 944         int ret;
 945
 946         backlight_state[0] = value;
 947         ret = queue_work(applesmc_led_wq, &backlight_work);
 948
 949         if (debug && (!ret))
 950                 dev_dbg(led_cdev->dev, "work was already on the queue.\n");
 951 }
 952
 953 static ssize_t applesmc_key_count_show(struct device *dev,
 954                                 struct device_attribute *attr, char *sysfsbuf)
 955 {
 956         int ret;
 957         u8 buffer[4];
 958         u32 count;
 959
 960         ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
 961         count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
 962                                                 ((u32)buffer[2]<<8) + buffer[3];
 963
 964         if (ret)
 965                 return ret;
 966         else
 967                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
 968 }
 969
 970 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
 971                                 struct device_attribute *attr, char *sysfsbuf)
 972 {
 973         const struct applesmc_entry *entry;
 974         int ret;
 975
 976         entry = applesmc_get_entry_by_index(key_at_index);
 977         if (IS_ERR(entry))
 978                 return PTR_ERR(entry);
 979         ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
 980         if (ret)
 981                 return ret;
 982
 983         return entry->len;
 984 }
 985
 986 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
 987                                 struct device_attribute *attr, char *sysfsbuf)
 988 {
 989         const struct applesmc_entry *entry;
 990
 991         entry = applesmc_get_entry_by_index(key_at_index);
 992         if (IS_ERR(entry))
 993                 return PTR_ERR(entry);
 994
 995         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
 996 }
 997
 998 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
 999                                 struct device_attribute *attr, char *sysfsbuf)
1000 {
1001         const struct applesmc_entry *entry;
1002
1003         entry = applesmc_get_entry_by_index(key_at_index);
1004         if (IS_ERR(entry))
1005                 return PTR_ERR(entry);
1006
1007         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
1008 }
1009
1010 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
1011                                 struct device_attribute *attr, char *sysfsbuf)
1012 {
1013         const struct applesmc_entry *entry;
1014
1015         entry = applesmc_get_entry_by_index(key_at_index);
1016         if (IS_ERR(entry))
1017                 return PTR_ERR(entry);
1018
1019         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
1020 }
1021
1022 static ssize_t applesmc_key_at_index_show(struct device *dev,
1023                                 struct device_attribute *attr, char *sysfsbuf)
1024 {
1025         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
1026 }
1027
1028 static ssize_t applesmc_key_at_index_store(struct device *dev,
1029         struct device_attribute *attr, const char *sysfsbuf, size_t count)
1030 {
1031         unsigned long newkey;
1032
1033         if (kstrtoul(sysfsbuf, 10, &newkey) < 0
1034             || newkey >= smcreg.key_count)
1035                 return -EINVAL;
1036
1037         key_at_index = newkey;
1038         return count;
1039 }
1040
1041 static struct led_classdev applesmc_backlight = {
1042         .name                   = "smc::kbd_backlight",
1043         .default_trigger        = "nand-disk",
1044         .brightness_set         = applesmc_brightness_set,
1045 };
1046
1047 static struct applesmc_node_group info_group[] = {
1048         { "name", applesmc_name_show },
1049         { "key_count", applesmc_key_count_show },
1050         { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1051         { "key_at_index_name", applesmc_key_at_index_name_show },
1052         { "key_at_index_type", applesmc_key_at_index_type_show },
1053         { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1054         { "key_at_index_data", applesmc_key_at_index_read_show },
1055         { }
1056 };
1057
1058 static struct applesmc_node_group accelerometer_group[] = {
1059         { "position", applesmc_position_show },
1060         { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1061         { }
1062 };
1063
1064 static struct applesmc_node_group light_sensor_group[] = {
1065         { "light", applesmc_light_show },
1066         { }
1067 };
1068
1069 static struct applesmc_node_group fan_group[] = {
1070         { "fan%d_label", applesmc_show_fan_position },
1071         { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1072         { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1073         { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1074         { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1075         { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1076         { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1077         { }
1078 };
1079
1080 static struct applesmc_node_group temp_group[] = {
1081         { "temp%d_label", applesmc_show_sensor_label },
1082         { "temp%d_input", applesmc_show_temperature },
1083         { }
1084 };
1085
1086 /* Module stuff */
1087
1088 /*
1089  * applesmc_destroy_nodes - remove files and free associated memory
1090  */
1091 static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1092 {
1093         struct applesmc_node_group *grp;
1094         struct applesmc_dev_attr *node;
1095
1096         for (grp = groups; grp->nodes; grp++) {
1097                 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1098                         sysfs_remove_file(&pdev->dev.kobj,
1099                                           &node->sda.dev_attr.attr);
1100                 kfree(grp->nodes);
1101                 grp->nodes = NULL;
1102         }
1103 }
1104
1105 /*
1106  * applesmc_create_nodes - create a two-dimensional group of sysfs files
1107  */
1108 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1109 {
1110         struct applesmc_node_group *grp;
1111         struct applesmc_dev_attr *node;
1112         struct attribute *attr;
1113         int ret, i;
1114
1115         for (grp = groups; grp->format; grp++) {
1116                 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1117                 if (!grp->nodes) {
1118                         ret = -ENOMEM;
1119                         goto out;
1120                 }
1121                 for (i = 0; i < num; i++) {
1122                         node = &grp->nodes[i];
1123                         scnprintf(node->name, sizeof(node->name), grp->format,
1124                                   i + 1);
1125                         node->sda.index = (grp->option << 16) | (i & 0xffff);
1126                         node->sda.dev_attr.show = grp->show;
1127                         node->sda.dev_attr.store = grp->store;
1128                         attr = &node->sda.dev_attr.attr;
1129                         sysfs_attr_init(attr);
1130                         attr->name = node->name;
1131                         attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
1132                         ret = sysfs_create_file(&pdev->dev.kobj, attr);
1133                         if (ret) {
1134                                 attr->name = NULL;
1135                                 goto out;
1136                         }
1137                 }
1138         }
1139
1140         return 0;
1141 out:
1142         applesmc_destroy_nodes(groups);
1143         return ret;
1144 }
1145
1146 /* Create accelerometer resources */
1147 static int applesmc_create_accelerometer(void)
1148 {
1149         struct input_dev *idev;
1150         int ret;
1151
1152         if (!smcreg.has_accelerometer)
1153                 return 0;
1154
1155         ret = applesmc_create_nodes(accelerometer_group, 1);
1156         if (ret)
1157                 goto out;
1158
1159         applesmc_idev = input_allocate_polled_device();
1160         if (!applesmc_idev) {
1161                 ret = -ENOMEM;
1162                 goto out_sysfs;
1163         }
1164
1165         applesmc_idev->poll = applesmc_idev_poll;
1166         applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
1167
1168         /* initial calibrate for the input device */
1169         applesmc_calibrate();
1170
1171         /* initialize the input device */
1172         idev = applesmc_idev->input;
1173         idev->name = "applesmc";
1174         idev->id.bustype = BUS_HOST;
1175         idev->dev.parent = &pdev->dev;
1176         idev->evbit[0] = BIT_MASK(EV_ABS);
1177         input_set_abs_params(idev, ABS_X,
1178                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1179         input_set_abs_params(idev, ABS_Y,
1180                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1181
1182         ret = input_register_polled_device(applesmc_idev);
1183         if (ret)
1184                 goto out_idev;
1185
1186         return 0;
1187
1188 out_idev:
1189         input_free_polled_device(applesmc_idev);
1190
1191 out_sysfs:
1192         applesmc_destroy_nodes(accelerometer_group);
1193
1194 out:
1195         pr_warn("driver init failed (ret=%d)!\n", ret);
1196         return ret;
1197 }
1198
1199 /* Release all resources used by the accelerometer */
1200 static void applesmc_release_accelerometer(void)
1201 {
1202         if (!smcreg.has_accelerometer)
1203                 return;
1204         input_unregister_polled_device(applesmc_idev);
1205         input_free_polled_device(applesmc_idev);
1206         applesmc_destroy_nodes(accelerometer_group);
1207 }
1208
1209 static int applesmc_create_light_sensor(void)
1210 {
1211         if (!smcreg.num_light_sensors)
1212                 return 0;
1213         return applesmc_create_nodes(light_sensor_group, 1);
1214 }
1215
1216 static void applesmc_release_light_sensor(void)
1217 {
1218         if (!smcreg.num_light_sensors)
1219                 return;
1220         applesmc_destroy_nodes(light_sensor_group);
1221 }
1222
1223 static int applesmc_create_key_backlight(void)
1224 {
1225         if (!smcreg.has_key_backlight)
1226                 return 0;
1227         applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1228         if (!applesmc_led_wq)
1229                 return -ENOMEM;
1230         return led_classdev_register(&pdev->dev, &applesmc_backlight);
1231 }
1232
1233 static void applesmc_release_key_backlight(void)
1234 {
1235         if (!smcreg.has_key_backlight)
1236                 return;
1237         led_classdev_unregister(&applesmc_backlight);
1238         destroy_workqueue(applesmc_led_wq);
1239 }
1240
1241 static int applesmc_dmi_match(const struct dmi_system_id *id)
1242 {
1243         return 1;
1244 }
1245
1246 /*
1247  * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1248  * So we need to put "Apple MacBook Pro" before "Apple MacBook".
1249  */
1250 static const struct dmi_system_id applesmc_whitelist[] __initconst = {
1251         { applesmc_dmi_match, "Apple MacBook Air", {
1252           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1253           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1254         },
1255         { applesmc_dmi_match, "Apple MacBook Pro", {
1256           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1257           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1258         },
1259         { applesmc_dmi_match, "Apple MacBook", {
1260           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1261           DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1262         },
1263         { applesmc_dmi_match, "Apple Macmini", {
1264           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1265           DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1266         },
1267         { applesmc_dmi_match, "Apple MacPro", {
1268           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1269           DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1270         },
1271         { applesmc_dmi_match, "Apple iMac", {
1272           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1273           DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1274         },
1275         { .ident = NULL }
1276 };
1277
1278 static int __init applesmc_init(void)
1279 {
1280         int ret;
1281
1282         if (!dmi_check_system(applesmc_whitelist)) {
1283                 pr_warn("supported laptop not found!\n");
1284                 ret = -ENODEV;
1285                 goto out;
1286         }
1287
1288         if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1289                                                                 "applesmc")) {
1290                 ret = -ENXIO;
1291                 goto out;
1292         }
1293
1294         ret = platform_driver_register(&applesmc_driver);
1295         if (ret)
1296                 goto out_region;
1297
1298         pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1299                                                NULL, 0);
1300         if (IS_ERR(pdev)) {
1301                 ret = PTR_ERR(pdev);
1302                 goto out_driver;
1303         }
1304
1305         /* create register cache */
1306         ret = applesmc_init_smcreg();
1307         if (ret)
1308                 goto out_device;
1309
1310         ret = applesmc_create_nodes(info_group, 1);
1311         if (ret)
1312                 goto out_smcreg;
1313
1314         ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1315         if (ret)
1316                 goto out_info;
1317
1318         ret = applesmc_create_nodes(temp_group, smcreg.index_count);
1319         if (ret)
1320                 goto out_fans;
1321
1322         ret = applesmc_create_accelerometer();
1323         if (ret)
1324                 goto out_temperature;
1325
1326         ret = applesmc_create_light_sensor();
1327         if (ret)
1328                 goto out_accelerometer;
1329
1330         ret = applesmc_create_key_backlight();
1331         if (ret)
1332                 goto out_light_sysfs;
1333
1334         hwmon_dev = hwmon_device_register(&pdev->dev);
1335         if (IS_ERR(hwmon_dev)) {
1336                 ret = PTR_ERR(hwmon_dev);
1337                 goto out_light_ledclass;
1338         }
1339
1340         return 0;
1341
1342 out_light_ledclass:
1343         applesmc_release_key_backlight();
1344 out_light_sysfs:
1345         applesmc_release_light_sensor();
1346 out_accelerometer:
1347         applesmc_release_accelerometer();
1348 out_temperature:
1349         applesmc_destroy_nodes(temp_group);
1350 out_fans:
1351         applesmc_destroy_nodes(fan_group);
1352 out_info:
1353         applesmc_destroy_nodes(info_group);
1354 out_smcreg:
1355         applesmc_destroy_smcreg();
1356 out_device:
1357         platform_device_unregister(pdev);
1358 out_driver:
1359         platform_driver_unregister(&applesmc_driver);
1360 out_region:
1361         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1362 out:
1363         pr_warn("driver init failed (ret=%d)!\n", ret);
1364         return ret;
1365 }
1366
1367 static void __exit applesmc_exit(void)
1368 {
1369         hwmon_device_unregister(hwmon_dev);
1370         applesmc_release_key_backlight();
1371         applesmc_release_light_sensor();
1372         applesmc_release_accelerometer();
1373         applesmc_destroy_nodes(temp_group);
1374         applesmc_destroy_nodes(fan_group);
1375         applesmc_destroy_nodes(info_group);
1376         applesmc_destroy_smcreg();
1377         platform_device_unregister(pdev);
1378         platform_driver_unregister(&applesmc_driver);
1379         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1380 }
1381
1382 module_init(applesmc_init);
1383 module_exit(applesmc_exit);
1384
1385 MODULE_AUTHOR("Nicolas Boichat");
1386 MODULE_DESCRIPTION("Apple SMC");
1387 MODULE_LICENSE("GPL v2");
1388 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);