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