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 <jesper.juhl@gmail.com>
  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 32 ms for a status change. */
  57 #define APPLESMC_MIN_WAIT       0x0040
  58 #define APPLESMC_MAX_WAIT       0x8000
  59
  60 #define APPLESMC_STATUS_MASK    0x0f
  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 /* List of keys used to read/write fan speeds */
  84 static const char *const fan_speed_fmt[] = {
  85         "F%dAc",                /* actual speed */
  86         "F%dMn",                /* minimum speed (rw) */
  87         "F%dMx",                /* maximum speed */
  88         "F%dSf",                /* safe speed - not all models */
  89         "F%dTg",                /* target speed (manual: rw) */
  90 };
  91
  92 #define INIT_TIMEOUT_MSECS      5000    /* wait up to 5s for device init ... */
  93 #define INIT_WAIT_MSECS         50      /* ... in 50ms increments */
  94
  95 #define APPLESMC_POLL_INTERVAL  50      /* msecs */
  96 #define APPLESMC_INPUT_FUZZ     4       /* input event threshold */
  97 #define APPLESMC_INPUT_FLAT     4
  98
  99 #define SENSOR_X 0
 100 #define SENSOR_Y 1
 101 #define SENSOR_Z 2
 102
 103 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
 104 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
 105
 106 /* Dynamic device node attributes */
 107 struct applesmc_dev_attr {
 108         struct sensor_device_attribute sda;     /* hwmon attributes */
 109         char name[32];                          /* room for node file name */
 110 };
 111
 112 /* Dynamic device node group */
 113 struct applesmc_node_group {
 114         char *format;                           /* format string */
 115         void *show;                             /* show function */
 116         void *store;                            /* store function */
 117         int option;                             /* function argument */
 118         struct applesmc_dev_attr *nodes;        /* dynamic node array */
 119 };
 120
 121 /* AppleSMC entry - cached register information */
 122 struct applesmc_entry {
 123         char key[5];            /* four-letter key code */
 124         u8 valid;               /* set when entry is successfully read once */
 125         u8 len;                 /* bounded by APPLESMC_MAX_DATA_LENGTH */
 126         char type[5];           /* four-letter type code */
 127         u8 flags;               /* 0x10: func; 0x40: write; 0x80: read */
 128 };
 129
 130 /* Register lookup and registers common to all SMCs */
 131 static struct applesmc_registers {
 132         struct mutex mutex;             /* register read/write mutex */
 133         unsigned int key_count;         /* number of SMC registers */
 134         unsigned int fan_count;         /* number of fans */
 135         unsigned int temp_count;        /* number of temperature registers */
 136         unsigned int temp_begin;        /* temperature lower index bound */
 137         unsigned int temp_end;          /* temperature upper index bound */
 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 } 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_status - Wait up to 32ms for the status port to get a certain value
 166  * (masked with 0x0f), returning zero if the value is obtained.  Callers must
 167  * hold applesmc_lock.
 168  */
 169 static int __wait_status(u8 val)
 170 {
 171         int us;
 172
 173         val = val & APPLESMC_STATUS_MASK;
 174
 175         for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
 176                 udelay(us);
 177                 if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val)
 178                         return 0;
 179         }
 180
 181         return -EIO;
 182 }
 183
 184 /*
 185  * special treatment of command port - on newer macbooks, it seems necessary
 186  * to resend the command byte before polling the status again. Callers must
 187  * hold applesmc_lock.
 188  */
 189 static int send_command(u8 cmd)
 190 {
 191         int us;
 192         for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
 193                 outb(cmd, APPLESMC_CMD_PORT);
 194                 udelay(us);
 195                 if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == 0x0c)
 196                         return 0;
 197         }
 198         return -EIO;
 199 }
 200
 201 static int send_argument(const char *key)
 202 {
 203         int i;
 204
 205         for (i = 0; i < 4; i++) {
 206                 outb(key[i], APPLESMC_DATA_PORT);
 207                 if (__wait_status(0x04))
 208                         return -EIO;
 209         }
 210         return 0;
 211 }
 212
 213 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
 214 {
 215         u8 status, data = 0;
 216         int i;
 217
 218         if (send_command(cmd) || send_argument(key)) {
 219                 pr_warn("%.4s: read arg fail\n", key);
 220                 return -EIO;
 221         }
 222
 223         /* This has no effect on newer (2012) SMCs */
 224         outb(len, APPLESMC_DATA_PORT);
 225
 226         for (i = 0; i < len; i++) {
 227                 if (__wait_status(0x05)) {
 228                         pr_warn("%.4s: read data fail\n", key);
 229                         return -EIO;
 230                 }
 231                 buffer[i] = inb(APPLESMC_DATA_PORT);
 232         }
 233
 234         /* Read the data port until bit0 is cleared */
 235         for (i = 0; i < 16; i++) {
 236                 udelay(APPLESMC_MIN_WAIT);
 237                 status = inb(APPLESMC_CMD_PORT);
 238                 if (!(status & 0x01))
 239                         break;
 240                 data = inb(APPLESMC_DATA_PORT);
 241         }
 242         if (i)
 243                 pr_warn("flushed %d bytes, last value is: %d\n", i, data);
 244
 245         return 0;
 246 }
 247
 248 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
 249 {
 250         int i;
 251
 252         if (send_command(cmd) || send_argument(key)) {
 253                 pr_warn("%s: write arg fail\n", key);
 254                 return -EIO;
 255         }
 256
 257         outb(len, APPLESMC_DATA_PORT);
 258
 259         for (i = 0; i < len; i++) {
 260                 if (__wait_status(0x04)) {
 261                         pr_warn("%s: write data fail\n", key);
 262                         return -EIO;
 263                 }
 264                 outb(buffer[i], APPLESMC_DATA_PORT);
 265         }
 266
 267         return 0;
 268 }
 269
 270 static int read_register_count(unsigned int *count)
 271 {
 272         __be32 be;
 273         int ret;
 274
 275         ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
 276         if (ret)
 277                 return ret;
 278
 279         *count = be32_to_cpu(be);
 280         return 0;
 281 }
 282
 283 /*
 284  * Serialized I/O
 285  *
 286  * Returns zero on success or a negative error on failure.
 287  * All functions below are concurrency safe - callers should NOT hold lock.
 288  */
 289
 290 static int applesmc_read_entry(const struct applesmc_entry *entry,
 291                                u8 *buf, u8 len)
 292 {
 293         int ret;
 294
 295         if (entry->len != len)
 296                 return -EINVAL;
 297         mutex_lock(&smcreg.mutex);
 298         ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
 299         mutex_unlock(&smcreg.mutex);
 300
 301         return ret;
 302 }
 303
 304 static int applesmc_write_entry(const struct applesmc_entry *entry,
 305                                 const u8 *buf, u8 len)
 306 {
 307         int ret;
 308
 309         if (entry->len != len)
 310                 return -EINVAL;
 311         mutex_lock(&smcreg.mutex);
 312         ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
 313         mutex_unlock(&smcreg.mutex);
 314         return ret;
 315 }
 316
 317 static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
 318 {
 319         struct applesmc_entry *cache = &smcreg.cache[index];
 320         u8 key[4], info[6];
 321         __be32 be;
 322         int ret = 0;
 323
 324         if (cache->valid)
 325                 return cache;
 326
 327         mutex_lock(&smcreg.mutex);
 328
 329         if (cache->valid)
 330                 goto out;
 331         be = cpu_to_be32(index);
 332         ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
 333         if (ret)
 334                 goto out;
 335         ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
 336         if (ret)
 337                 goto out;
 338
 339         memcpy(cache->key, key, 4);
 340         cache->len = info[0];
 341         memcpy(cache->type, &info[1], 4);
 342         cache->flags = info[5];
 343         cache->valid = 1;
 344
 345 out:
 346         mutex_unlock(&smcreg.mutex);
 347         if (ret)
 348                 return ERR_PTR(ret);
 349         return cache;
 350 }
 351
 352 static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
 353 {
 354         int begin = 0, end = smcreg.key_count;
 355         const struct applesmc_entry *entry;
 356
 357         while (begin != end) {
 358                 int middle = begin + (end - begin) / 2;
 359                 entry = applesmc_get_entry_by_index(middle);
 360                 if (IS_ERR(entry)) {
 361                         *lo = 0;
 362                         return PTR_ERR(entry);
 363                 }
 364                 if (strcmp(entry->key, key) < 0)
 365                         begin = middle + 1;
 366                 else
 367                         end = middle;
 368         }
 369
 370         *lo = begin;
 371         return 0;
 372 }
 373
 374 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
 375 {
 376         int begin = 0, end = smcreg.key_count;
 377         const struct applesmc_entry *entry;
 378
 379         while (begin != end) {
 380                 int middle = begin + (end - begin) / 2;
 381                 entry = applesmc_get_entry_by_index(middle);
 382                 if (IS_ERR(entry)) {
 383                         *hi = smcreg.key_count;
 384                         return PTR_ERR(entry);
 385                 }
 386                 if (strcmp(key, entry->key) < 0)
 387                         end = middle;
 388                 else
 389                         begin = middle + 1;
 390         }
 391
 392         *hi = begin;
 393         return 0;
 394 }
 395
 396 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
 397 {
 398         int begin, end;
 399         int ret;
 400
 401         ret = applesmc_get_lower_bound(&begin, key);
 402         if (ret)
 403                 return ERR_PTR(ret);
 404         ret = applesmc_get_upper_bound(&end, key);
 405         if (ret)
 406                 return ERR_PTR(ret);
 407         if (end - begin != 1)
 408                 return ERR_PTR(-EINVAL);
 409
 410         return applesmc_get_entry_by_index(begin);
 411 }
 412
 413 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
 414 {
 415         const struct applesmc_entry *entry;
 416
 417         entry = applesmc_get_entry_by_key(key);
 418         if (IS_ERR(entry))
 419                 return PTR_ERR(entry);
 420
 421         return applesmc_read_entry(entry, buffer, len);
 422 }
 423
 424 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
 425 {
 426         const struct applesmc_entry *entry;
 427
 428         entry = applesmc_get_entry_by_key(key);
 429         if (IS_ERR(entry))
 430                 return PTR_ERR(entry);
 431
 432         return applesmc_write_entry(entry, buffer, len);
 433 }
 434
 435 static int applesmc_has_key(const char *key, bool *value)
 436 {
 437         const struct applesmc_entry *entry;
 438
 439         entry = applesmc_get_entry_by_key(key);
 440         if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
 441                 return PTR_ERR(entry);
 442
 443         *value = !IS_ERR(entry);
 444         return 0;
 445 }
 446
 447 /*
 448  * applesmc_read_motion_sensor - Read motion sensor (X, Y or Z).
 449  */
 450 static int applesmc_read_motion_sensor(int index, s16 *value)
 451 {
 452         u8 buffer[2];
 453         int ret;
 454
 455         switch (index) {
 456         case SENSOR_X:
 457                 ret = applesmc_read_key(MOTION_SENSOR_X_KEY, buffer, 2);
 458                 break;
 459         case SENSOR_Y:
 460                 ret = applesmc_read_key(MOTION_SENSOR_Y_KEY, buffer, 2);
 461                 break;
 462         case SENSOR_Z:
 463                 ret = applesmc_read_key(MOTION_SENSOR_Z_KEY, buffer, 2);
 464                 break;
 465         default:
 466                 ret = -EINVAL;
 467         }
 468
 469         *value = ((s16)buffer[0] << 8) | buffer[1];
 470
 471         return ret;
 472 }
 473
 474 /*
 475  * applesmc_device_init - initialize the accelerometer.  Can sleep.
 476  */
 477 static void applesmc_device_init(void)
 478 {
 479         int total;
 480         u8 buffer[2];
 481
 482         if (!smcreg.has_accelerometer)
 483                 return;
 484
 485         for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
 486                 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
 487                                 (buffer[0] != 0x00 || buffer[1] != 0x00))
 488                         return;
 489                 buffer[0] = 0xe0;
 490                 buffer[1] = 0x00;
 491                 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
 492                 msleep(INIT_WAIT_MSECS);
 493         }
 494
 495         pr_warn("failed to init the device\n");
 496 }
 497
 498 /*
 499  * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
 500  */
 501 static int applesmc_init_smcreg_try(void)
 502 {
 503         struct applesmc_registers *s = &smcreg;
 504         bool left_light_sensor, right_light_sensor;
 505         unsigned int count;
 506         u8 tmp[1];
 507         int ret;
 508
 509         if (s->init_complete)
 510                 return 0;
 511
 512         ret = read_register_count(&count);
 513         if (ret)
 514                 return ret;
 515
 516         if (s->cache && s->key_count != count) {
 517                 pr_warn("key count changed from %d to %d\n",
 518                         s->key_count, count);
 519                 kfree(s->cache);
 520                 s->cache = NULL;
 521         }
 522         s->key_count = count;
 523
 524         if (!s->cache)
 525                 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
 526         if (!s->cache)
 527                 return -ENOMEM;
 528
 529         ret = applesmc_read_key(FANS_COUNT, tmp, 1);
 530         if (ret)
 531                 return ret;
 532         s->fan_count = tmp[0];
 533
 534         ret = applesmc_get_lower_bound(&s->temp_begin, "T");
 535         if (ret)
 536                 return ret;
 537         ret = applesmc_get_lower_bound(&s->temp_end, "U");
 538         if (ret)
 539                 return ret;
 540         s->temp_count = s->temp_end - s->temp_begin;
 541
 542         ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
 543         if (ret)
 544                 return ret;
 545         ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
 546         if (ret)
 547                 return ret;
 548         ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
 549         if (ret)
 550                 return ret;
 551         ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
 552         if (ret)
 553                 return ret;
 554
 555         s->num_light_sensors = left_light_sensor + right_light_sensor;
 556         s->init_complete = true;
 557
 558         pr_info("key=%d fan=%d temp=%d acc=%d lux=%d kbd=%d\n",
 559                s->key_count, s->fan_count, s->temp_count,
 560                s->has_accelerometer,
 561                s->num_light_sensors,
 562                s->has_key_backlight);
 563
 564         return 0;
 565 }
 566
 567 /*
 568  * applesmc_init_smcreg - Initialize register cache.
 569  *
 570  * Retries until initialization is successful, or the operation times out.
 571  *
 572  */
 573 static int applesmc_init_smcreg(void)
 574 {
 575         int ms, ret;
 576
 577         for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
 578                 ret = applesmc_init_smcreg_try();
 579                 if (!ret) {
 580                         if (ms)
 581                                 pr_info("init_smcreg() took %d ms\n", ms);
 582                         return 0;
 583                 }
 584                 msleep(INIT_WAIT_MSECS);
 585         }
 586
 587         kfree(smcreg.cache);
 588         smcreg.cache = NULL;
 589
 590         return ret;
 591 }
 592
 593 static void applesmc_destroy_smcreg(void)
 594 {
 595         kfree(smcreg.cache);
 596         smcreg.cache = NULL;
 597         smcreg.init_complete = false;
 598 }
 599
 600 /* Device model stuff */
 601 static int applesmc_probe(struct platform_device *dev)
 602 {
 603         int ret;
 604
 605         ret = applesmc_init_smcreg();
 606         if (ret)
 607                 return ret;
 608
 609         applesmc_device_init();
 610
 611         return 0;
 612 }
 613
 614 /* Synchronize device with memorized backlight state */
 615 static int applesmc_pm_resume(struct device *dev)
 616 {
 617         if (smcreg.has_key_backlight)
 618                 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
 619         return 0;
 620 }
 621
 622 /* Reinitialize device on resume from hibernation */
 623 static int applesmc_pm_restore(struct device *dev)
 624 {
 625         applesmc_device_init();
 626         return applesmc_pm_resume(dev);
 627 }
 628
 629 static const struct dev_pm_ops applesmc_pm_ops = {
 630         .resume = applesmc_pm_resume,
 631         .restore = applesmc_pm_restore,
 632 };
 633
 634 static struct platform_driver applesmc_driver = {
 635         .probe = applesmc_probe,
 636         .driver = {
 637                 .name = "applesmc",
 638                 .owner = THIS_MODULE,
 639                 .pm = &applesmc_pm_ops,
 640         },
 641 };
 642
 643 /*
 644  * applesmc_calibrate - Set our "resting" values.  Callers must
 645  * hold applesmc_lock.
 646  */
 647 static void applesmc_calibrate(void)
 648 {
 649         applesmc_read_motion_sensor(SENSOR_X, &rest_x);
 650         applesmc_read_motion_sensor(SENSOR_Y, &rest_y);
 651         rest_x = -rest_x;
 652 }
 653
 654 static void applesmc_idev_poll(struct input_polled_dev *dev)
 655 {
 656         struct input_dev *idev = dev->input;
 657         s16 x, y;
 658
 659         if (applesmc_read_motion_sensor(SENSOR_X, &x))
 660                 return;
 661         if (applesmc_read_motion_sensor(SENSOR_Y, &y))
 662                 return;
 663
 664         x = -x;
 665         input_report_abs(idev, ABS_X, x - rest_x);
 666         input_report_abs(idev, ABS_Y, y - rest_y);
 667         input_sync(idev);
 668 }
 669
 670 /* Sysfs Files */
 671
 672 static ssize_t applesmc_name_show(struct device *dev,
 673                                    struct device_attribute *attr, char *buf)
 674 {
 675         return snprintf(buf, PAGE_SIZE, "applesmc\n");
 676 }
 677
 678 static ssize_t applesmc_position_show(struct device *dev,
 679                                    struct device_attribute *attr, char *buf)
 680 {
 681         int ret;
 682         s16 x, y, z;
 683
 684         ret = applesmc_read_motion_sensor(SENSOR_X, &x);
 685         if (ret)
 686                 goto out;
 687         ret = applesmc_read_motion_sensor(SENSOR_Y, &y);
 688         if (ret)
 689                 goto out;
 690         ret = applesmc_read_motion_sensor(SENSOR_Z, &z);
 691         if (ret)
 692                 goto out;
 693
 694 out:
 695         if (ret)
 696                 return ret;
 697         else
 698                 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
 699 }
 700
 701 static ssize_t applesmc_light_show(struct device *dev,
 702                                 struct device_attribute *attr, char *sysfsbuf)
 703 {
 704         const struct applesmc_entry *entry;
 705         static int data_length;
 706         int ret;
 707         u8 left = 0, right = 0;
 708         u8 buffer[10];
 709
 710         if (!data_length) {
 711                 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
 712                 if (IS_ERR(entry))
 713                         return PTR_ERR(entry);
 714                 if (entry->len > 10)
 715                         return -ENXIO;
 716                 data_length = entry->len;
 717                 pr_info("light sensor data length set to %d\n", data_length);
 718         }
 719
 720         ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
 721         /* newer macbooks report a single 10-bit bigendian value */
 722         if (data_length == 10) {
 723                 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
 724                 goto out;
 725         }
 726         left = buffer[2];
 727         if (ret)
 728                 goto out;
 729         ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
 730         right = buffer[2];
 731
 732 out:
 733         if (ret)
 734                 return ret;
 735         else
 736                 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
 737 }
 738
 739 /* Displays sensor key as label */
 740 static ssize_t applesmc_show_sensor_label(struct device *dev,
 741                         struct device_attribute *devattr, char *sysfsbuf)
 742 {
 743         int index = smcreg.temp_begin + to_index(devattr);
 744         const struct applesmc_entry *entry;
 745
 746         entry = applesmc_get_entry_by_index(index);
 747         if (IS_ERR(entry))
 748                 return PTR_ERR(entry);
 749
 750         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
 751 }
 752
 753 /* Displays degree Celsius * 1000 */
 754 static ssize_t applesmc_show_temperature(struct device *dev,
 755                         struct device_attribute *devattr, char *sysfsbuf)
 756 {
 757         int index = smcreg.temp_begin + to_index(devattr);
 758         const struct applesmc_entry *entry;
 759         int ret;
 760         u8 buffer[2];
 761         unsigned int temp;
 762
 763         entry = applesmc_get_entry_by_index(index);
 764         if (IS_ERR(entry))
 765                 return PTR_ERR(entry);
 766         if (entry->len > 2)
 767                 return -EINVAL;
 768
 769         ret = applesmc_read_entry(entry, buffer, entry->len);
 770         if (ret)
 771                 return ret;
 772
 773         if (entry->len == 2) {
 774                 temp = buffer[0] * 1000;
 775                 temp += (buffer[1] >> 6) * 250;
 776         } else {
 777                 temp = buffer[0] * 4000;
 778         }
 779
 780         return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", temp);
 781 }
 782
 783 static ssize_t applesmc_show_fan_speed(struct device *dev,
 784                                 struct device_attribute *attr, char *sysfsbuf)
 785 {
 786         int ret;
 787         unsigned int speed = 0;
 788         char newkey[5];
 789         u8 buffer[2];
 790
 791         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
 792
 793         ret = applesmc_read_key(newkey, buffer, 2);
 794         speed = ((buffer[0] << 8 | buffer[1]) >> 2);
 795
 796         if (ret)
 797                 return ret;
 798         else
 799                 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
 800 }
 801
 802 static ssize_t applesmc_store_fan_speed(struct device *dev,
 803                                         struct device_attribute *attr,
 804                                         const char *sysfsbuf, size_t count)
 805 {
 806         int ret;
 807         unsigned long speed;
 808         char newkey[5];
 809         u8 buffer[2];
 810
 811         if (strict_strtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
 812                 return -EINVAL;         /* Bigger than a 14-bit value */
 813
 814         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
 815
 816         buffer[0] = (speed >> 6) & 0xff;
 817         buffer[1] = (speed << 2) & 0xff;
 818         ret = applesmc_write_key(newkey, buffer, 2);
 819
 820         if (ret)
 821                 return ret;
 822         else
 823                 return count;
 824 }
 825
 826 static ssize_t applesmc_show_fan_manual(struct device *dev,
 827                         struct device_attribute *attr, char *sysfsbuf)
 828 {
 829         int ret;
 830         u16 manual = 0;
 831         u8 buffer[2];
 832
 833         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 834         manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
 835
 836         if (ret)
 837                 return ret;
 838         else
 839                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
 840 }
 841
 842 static ssize_t applesmc_store_fan_manual(struct device *dev,
 843                                          struct device_attribute *attr,
 844                                          const char *sysfsbuf, size_t count)
 845 {
 846         int ret;
 847         u8 buffer[2];
 848         unsigned long input;
 849         u16 val;
 850
 851         if (strict_strtoul(sysfsbuf, 10, &input) < 0)
 852                 return -EINVAL;
 853
 854         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 855         val = (buffer[0] << 8 | buffer[1]);
 856         if (ret)
 857                 goto out;
 858
 859         if (input)
 860                 val = val | (0x01 << to_index(attr));
 861         else
 862                 val = val & ~(0x01 << to_index(attr));
 863
 864         buffer[0] = (val >> 8) & 0xFF;
 865         buffer[1] = val & 0xFF;
 866
 867         ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
 868
 869 out:
 870         if (ret)
 871                 return ret;
 872         else
 873                 return count;
 874 }
 875
 876 static ssize_t applesmc_show_fan_position(struct device *dev,
 877                                 struct device_attribute *attr, char *sysfsbuf)
 878 {
 879         int ret;
 880         char newkey[5];
 881         u8 buffer[17];
 882
 883         sprintf(newkey, FAN_ID_FMT, to_index(attr));
 884
 885         ret = applesmc_read_key(newkey, buffer, 16);
 886         buffer[16] = 0;
 887
 888         if (ret)
 889                 return ret;
 890         else
 891                 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
 892 }
 893
 894 static ssize_t applesmc_calibrate_show(struct device *dev,
 895                                 struct device_attribute *attr, char *sysfsbuf)
 896 {
 897         return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
 898 }
 899
 900 static ssize_t applesmc_calibrate_store(struct device *dev,
 901         struct device_attribute *attr, const char *sysfsbuf, size_t count)
 902 {
 903         applesmc_calibrate();
 904
 905         return count;
 906 }
 907
 908 static void applesmc_backlight_set(struct work_struct *work)
 909 {
 910         applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
 911 }
 912 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
 913
 914 static void applesmc_brightness_set(struct led_classdev *led_cdev,
 915                                                 enum led_brightness value)
 916 {
 917         int ret;
 918
 919         backlight_state[0] = value;
 920         ret = queue_work(applesmc_led_wq, &backlight_work);
 921
 922         if (debug && (!ret))
 923                 printk(KERN_DEBUG "applesmc: work was already on the queue.\n");
 924 }
 925
 926 static ssize_t applesmc_key_count_show(struct device *dev,
 927                                 struct device_attribute *attr, char *sysfsbuf)
 928 {
 929         int ret;
 930         u8 buffer[4];
 931         u32 count;
 932
 933         ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
 934         count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
 935                                                 ((u32)buffer[2]<<8) + buffer[3];
 936
 937         if (ret)
 938                 return ret;
 939         else
 940                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
 941 }
 942
 943 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
 944                                 struct device_attribute *attr, char *sysfsbuf)
 945 {
 946         const struct applesmc_entry *entry;
 947         int ret;
 948
 949         entry = applesmc_get_entry_by_index(key_at_index);
 950         if (IS_ERR(entry))
 951                 return PTR_ERR(entry);
 952         ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
 953         if (ret)
 954                 return ret;
 955
 956         return entry->len;
 957 }
 958
 959 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
 960                                 struct device_attribute *attr, char *sysfsbuf)
 961 {
 962         const struct applesmc_entry *entry;
 963
 964         entry = applesmc_get_entry_by_index(key_at_index);
 965         if (IS_ERR(entry))
 966                 return PTR_ERR(entry);
 967
 968         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
 969 }
 970
 971 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
 972                                 struct device_attribute *attr, char *sysfsbuf)
 973 {
 974         const struct applesmc_entry *entry;
 975
 976         entry = applesmc_get_entry_by_index(key_at_index);
 977         if (IS_ERR(entry))
 978                 return PTR_ERR(entry);
 979
 980         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
 981 }
 982
 983 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
 984                                 struct device_attribute *attr, char *sysfsbuf)
 985 {
 986         const struct applesmc_entry *entry;
 987
 988         entry = applesmc_get_entry_by_index(key_at_index);
 989         if (IS_ERR(entry))
 990                 return PTR_ERR(entry);
 991
 992         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
 993 }
 994
 995 static ssize_t applesmc_key_at_index_show(struct device *dev,
 996                                 struct device_attribute *attr, char *sysfsbuf)
 997 {
 998         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
 999 }
1000
1001 static ssize_t applesmc_key_at_index_store(struct device *dev,
1002         struct device_attribute *attr, const char *sysfsbuf, size_t count)
1003 {
1004         unsigned long newkey;
1005
1006         if (strict_strtoul(sysfsbuf, 10, &newkey) < 0
1007             || newkey >= smcreg.key_count)
1008                 return -EINVAL;
1009
1010         key_at_index = newkey;
1011         return count;
1012 }
1013
1014 static struct led_classdev applesmc_backlight = {
1015         .name                   = "smc::kbd_backlight",
1016         .default_trigger        = "nand-disk",
1017         .brightness_set         = applesmc_brightness_set,
1018 };
1019
1020 static struct applesmc_node_group info_group[] = {
1021         { "name", applesmc_name_show },
1022         { "key_count", applesmc_key_count_show },
1023         { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1024         { "key_at_index_name", applesmc_key_at_index_name_show },
1025         { "key_at_index_type", applesmc_key_at_index_type_show },
1026         { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1027         { "key_at_index_data", applesmc_key_at_index_read_show },
1028         { }
1029 };
1030
1031 static struct applesmc_node_group accelerometer_group[] = {
1032         { "position", applesmc_position_show },
1033         { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1034         { }
1035 };
1036
1037 static struct applesmc_node_group light_sensor_group[] = {
1038         { "light", applesmc_light_show },
1039         { }
1040 };
1041
1042 static struct applesmc_node_group fan_group[] = {
1043         { "fan%d_label", applesmc_show_fan_position },
1044         { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1045         { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1046         { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1047         { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1048         { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1049         { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1050         { }
1051 };
1052
1053 static struct applesmc_node_group temp_group[] = {
1054         { "temp%d_label", applesmc_show_sensor_label },
1055         { "temp%d_input", applesmc_show_temperature },
1056         { }
1057 };
1058
1059 /* Module stuff */
1060
1061 /*
1062  * applesmc_destroy_nodes - remove files and free associated memory
1063  */
1064 static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1065 {
1066         struct applesmc_node_group *grp;
1067         struct applesmc_dev_attr *node;
1068
1069         for (grp = groups; grp->nodes; grp++) {
1070                 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1071                         sysfs_remove_file(&pdev->dev.kobj,
1072                                           &node->sda.dev_attr.attr);
1073                 kfree(grp->nodes);
1074                 grp->nodes = NULL;
1075         }
1076 }
1077
1078 /*
1079  * applesmc_create_nodes - create a two-dimensional group of sysfs files
1080  */
1081 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1082 {
1083         struct applesmc_node_group *grp;
1084         struct applesmc_dev_attr *node;
1085         struct attribute *attr;
1086         int ret, i;
1087
1088         for (grp = groups; grp->format; grp++) {
1089                 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1090                 if (!grp->nodes) {
1091                         ret = -ENOMEM;
1092                         goto out;
1093                 }
1094                 for (i = 0; i < num; i++) {
1095                         node = &grp->nodes[i];
1096                         sprintf(node->name, grp->format, i + 1);
1097                         node->sda.index = (grp->option << 16) | (i & 0xffff);
1098                         node->sda.dev_attr.show = grp->show;
1099                         node->sda.dev_attr.store = grp->store;
1100                         attr = &node->sda.dev_attr.attr;
1101                         sysfs_attr_init(attr);
1102                         attr->name = node->name;
1103                         attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
1104                         ret = sysfs_create_file(&pdev->dev.kobj, attr);
1105                         if (ret) {
1106                                 attr->name = NULL;
1107                                 goto out;
1108                         }
1109                 }
1110         }
1111
1112         return 0;
1113 out:
1114         applesmc_destroy_nodes(groups);
1115         return ret;
1116 }
1117
1118 /* Create accelerometer ressources */
1119 static int applesmc_create_accelerometer(void)
1120 {
1121         struct input_dev *idev;
1122         int ret;
1123
1124         if (!smcreg.has_accelerometer)
1125                 return 0;
1126
1127         ret = applesmc_create_nodes(accelerometer_group, 1);
1128         if (ret)
1129                 goto out;
1130
1131         applesmc_idev = input_allocate_polled_device();
1132         if (!applesmc_idev) {
1133                 ret = -ENOMEM;
1134                 goto out_sysfs;
1135         }
1136
1137         applesmc_idev->poll = applesmc_idev_poll;
1138         applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
1139
1140         /* initial calibrate for the input device */
1141         applesmc_calibrate();
1142
1143         /* initialize the input device */
1144         idev = applesmc_idev->input;
1145         idev->name = "applesmc";
1146         idev->id.bustype = BUS_HOST;
1147         idev->dev.parent = &pdev->dev;
1148         idev->evbit[0] = BIT_MASK(EV_ABS);
1149         input_set_abs_params(idev, ABS_X,
1150                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1151         input_set_abs_params(idev, ABS_Y,
1152                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1153
1154         ret = input_register_polled_device(applesmc_idev);
1155         if (ret)
1156                 goto out_idev;
1157
1158         return 0;
1159
1160 out_idev:
1161         input_free_polled_device(applesmc_idev);
1162
1163 out_sysfs:
1164         applesmc_destroy_nodes(accelerometer_group);
1165
1166 out:
1167         pr_warn("driver init failed (ret=%d)!\n", ret);
1168         return ret;
1169 }
1170
1171 /* Release all ressources used by the accelerometer */
1172 static void applesmc_release_accelerometer(void)
1173 {
1174         if (!smcreg.has_accelerometer)
1175                 return;
1176         input_unregister_polled_device(applesmc_idev);
1177         input_free_polled_device(applesmc_idev);
1178         applesmc_destroy_nodes(accelerometer_group);
1179 }
1180
1181 static int applesmc_create_light_sensor(void)
1182 {
1183         if (!smcreg.num_light_sensors)
1184                 return 0;
1185         return applesmc_create_nodes(light_sensor_group, 1);
1186 }
1187
1188 static void applesmc_release_light_sensor(void)
1189 {
1190         if (!smcreg.num_light_sensors)
1191                 return;
1192         applesmc_destroy_nodes(light_sensor_group);
1193 }
1194
1195 static int applesmc_create_key_backlight(void)
1196 {
1197         if (!smcreg.has_key_backlight)
1198                 return 0;
1199         applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1200         if (!applesmc_led_wq)
1201                 return -ENOMEM;
1202         return led_classdev_register(&pdev->dev, &applesmc_backlight);
1203 }
1204
1205 static void applesmc_release_key_backlight(void)
1206 {
1207         if (!smcreg.has_key_backlight)
1208                 return;
1209         led_classdev_unregister(&applesmc_backlight);
1210         destroy_workqueue(applesmc_led_wq);
1211 }
1212
1213 static int applesmc_dmi_match(const struct dmi_system_id *id)
1214 {
1215         return 1;
1216 }
1217
1218 /* Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1219  * So we need to put "Apple MacBook Pro" before "Apple MacBook". */
1220 static __initdata struct dmi_system_id applesmc_whitelist[] = {
1221         { applesmc_dmi_match, "Apple MacBook Air", {
1222           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1223           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1224         },
1225         { applesmc_dmi_match, "Apple MacBook Pro", {
1226           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1227           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1228         },
1229         { applesmc_dmi_match, "Apple MacBook", {
1230           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1231           DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1232         },
1233         { applesmc_dmi_match, "Apple Macmini", {
1234           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1235           DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1236         },
1237         { applesmc_dmi_match, "Apple MacPro", {
1238           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1239           DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1240         },
1241         { applesmc_dmi_match, "Apple iMac", {
1242           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1243           DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1244         },
1245         { .ident = NULL }
1246 };
1247
1248 static int __init applesmc_init(void)
1249 {
1250         int ret;
1251
1252         if (!dmi_check_system(applesmc_whitelist)) {
1253                 pr_warn("supported laptop not found!\n");
1254                 ret = -ENODEV;
1255                 goto out;
1256         }
1257
1258         if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1259                                                                 "applesmc")) {
1260                 ret = -ENXIO;
1261                 goto out;
1262         }
1263
1264         ret = platform_driver_register(&applesmc_driver);
1265         if (ret)
1266                 goto out_region;
1267
1268         pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1269                                                NULL, 0);
1270         if (IS_ERR(pdev)) {
1271                 ret = PTR_ERR(pdev);
1272                 goto out_driver;
1273         }
1274
1275         /* create register cache */
1276         ret = applesmc_init_smcreg();
1277         if (ret)
1278                 goto out_device;
1279
1280         ret = applesmc_create_nodes(info_group, 1);
1281         if (ret)
1282                 goto out_smcreg;
1283
1284         ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1285         if (ret)
1286                 goto out_info;
1287
1288         ret = applesmc_create_nodes(temp_group, smcreg.temp_count);
1289         if (ret)
1290                 goto out_fans;
1291
1292         ret = applesmc_create_accelerometer();
1293         if (ret)
1294                 goto out_temperature;
1295
1296         ret = applesmc_create_light_sensor();
1297         if (ret)
1298                 goto out_accelerometer;
1299
1300         ret = applesmc_create_key_backlight();
1301         if (ret)
1302                 goto out_light_sysfs;
1303
1304         hwmon_dev = hwmon_device_register(&pdev->dev);
1305         if (IS_ERR(hwmon_dev)) {
1306                 ret = PTR_ERR(hwmon_dev);
1307                 goto out_light_ledclass;
1308         }
1309
1310         return 0;
1311
1312 out_light_ledclass:
1313         applesmc_release_key_backlight();
1314 out_light_sysfs:
1315         applesmc_release_light_sensor();
1316 out_accelerometer:
1317         applesmc_release_accelerometer();
1318 out_temperature:
1319         applesmc_destroy_nodes(temp_group);
1320 out_fans:
1321         applesmc_destroy_nodes(fan_group);
1322 out_info:
1323         applesmc_destroy_nodes(info_group);
1324 out_smcreg:
1325         applesmc_destroy_smcreg();
1326 out_device:
1327         platform_device_unregister(pdev);
1328 out_driver:
1329         platform_driver_unregister(&applesmc_driver);
1330 out_region:
1331         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1332 out:
1333         pr_warn("driver init failed (ret=%d)!\n", ret);
1334         return ret;
1335 }
1336
1337 static void __exit applesmc_exit(void)
1338 {
1339         hwmon_device_unregister(hwmon_dev);
1340         applesmc_release_key_backlight();
1341         applesmc_release_light_sensor();
1342         applesmc_release_accelerometer();
1343         applesmc_destroy_nodes(temp_group);
1344         applesmc_destroy_nodes(fan_group);
1345         applesmc_destroy_nodes(info_group);
1346         applesmc_destroy_smcreg();
1347         platform_device_unregister(pdev);
1348         platform_driver_unregister(&applesmc_driver);
1349         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1350 }
1351
1352 module_init(applesmc_init);
1353 module_exit(applesmc_exit);
1354
1355 MODULE_AUTHOR("Nicolas Boichat");
1356 MODULE_DESCRIPTION("Apple SMC");
1357 MODULE_LICENSE("GPL v2");
1358 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);