drivers/hwmon/applesmc.c

   1 /*
   2  * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
   3  * sensors, fan control, keyboard backlight control) used in Intel-based Apple
   4  * computers.
   5  *
   6  * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
   7  * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
   8  *
   9  * Based on hdaps.c driver:
  10  * Copyright (C) 2005 Robert Love <rml@novell.com>
  11  * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
  12  *
  13  * Fan control based on smcFanControl:
  14  * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
  15  *
  16  * This program is free software; you can redistribute it and/or modify it
  17  * under the terms of the GNU General Public License v2 as published by the
  18  * Free Software Foundation.
  19  *
  20  * This program is distributed in the hope that it will be useful, but WITHOUT
  21  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  22  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  23  * more details.
  24  *
  25  * You should have received a copy of the GNU General Public License along with
  26  * this program; if not, write to the Free Software Foundation, Inc.,
  27  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  28  */
  29
  30 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  31
  32 #include <linux/delay.h>
  33 #include <linux/platform_device.h>
  34 #include <linux/input-polldev.h>
  35 #include <linux/kernel.h>
  36 #include <linux/slab.h>
  37 #include <linux/module.h>
  38 #include <linux/timer.h>
  39 #include <linux/dmi.h>
  40 #include <linux/mutex.h>
  41 #include <linux/hwmon-sysfs.h>
  42 #include <linux/io.h>
  43 #include <linux/leds.h>
  44 #include <linux/hwmon.h>
  45 #include <linux/workqueue.h>
  46 #include <linux/err.h>
  47
  48 /* data port used by Apple SMC */
  49 #define APPLESMC_DATA_PORT      0x300
  50 /* command/status port used by Apple SMC */
  51 #define APPLESMC_CMD_PORT       0x304
  52
  53 #define APPLESMC_NR_PORTS       32 /* 0x300-0x31f */
  54
  55 #define APPLESMC_MAX_DATA_LENGTH 32
  56
  57 /* wait up to 128 ms for a status change. */
  58 #define APPLESMC_MIN_WAIT       0x0010
  59 #define APPLESMC_RETRY_WAIT     0x0100
  60 #define APPLESMC_MAX_WAIT       0x20000
  61
  62 #define APPLESMC_READ_CMD       0x10
  63 #define APPLESMC_WRITE_CMD      0x11
  64 #define APPLESMC_GET_KEY_BY_INDEX_CMD   0x12
  65 #define APPLESMC_GET_KEY_TYPE_CMD       0x13
  66
  67 #define KEY_COUNT_KEY           "#KEY" /* r-o ui32 */
  68
  69 #define LIGHT_SENSOR_LEFT_KEY   "ALV0" /* r-o {alv (6-10 bytes) */
  70 #define LIGHT_SENSOR_RIGHT_KEY  "ALV1" /* r-o {alv (6-10 bytes) */
  71 #define BACKLIGHT_KEY           "LKSB" /* w-o {lkb (2 bytes) */
  72
  73 #define CLAMSHELL_KEY           "MSLD" /* r-o ui8 (unused) */
  74
  75 #define MOTION_SENSOR_X_KEY     "MO_X" /* r-o sp78 (2 bytes) */
  76 #define MOTION_SENSOR_Y_KEY     "MO_Y" /* r-o sp78 (2 bytes) */
  77 #define MOTION_SENSOR_Z_KEY     "MO_Z" /* r-o sp78 (2 bytes) */
  78 #define MOTION_SENSOR_KEY       "MOCN" /* r/w ui16 */
  79
  80 #define FANS_COUNT              "FNum" /* r-o ui8 */
  81 #define FANS_MANUAL             "FS! " /* r-w ui16 */
  82 #define FAN_ID_FMT              "F%dID" /* r-o char[16] */
  83
  84 #define TEMP_SENSOR_TYPE        "sp78"
  85
  86 /* List of keys used to read/write fan speeds */
  87 static const char *const fan_speed_fmt[] = {
  88         "F%dAc",                /* actual speed */
  89         "F%dMn",                /* minimum speed (rw) */
  90         "F%dMx",                /* maximum speed */
  91         "F%dSf",                /* safe speed - not all models */
  92         "F%dTg",                /* target speed (manual: rw) */
  93 };
  94
  95 #define INIT_TIMEOUT_MSECS      5000    /* wait up to 5s for device init ... */
  96 #define INIT_WAIT_MSECS         50      /* ... in 50ms increments */
  97
  98 #define APPLESMC_POLL_INTERVAL  50      /* msecs */
  99 #define APPLESMC_INPUT_FUZZ     4       /* input event threshold */
 100 #define APPLESMC_INPUT_FLAT     4
 101
 102 #define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
 103 #define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)
 104
 105 /* Dynamic device node attributes */
 106 struct applesmc_dev_attr {
 107         struct sensor_device_attribute sda;     /* hwmon attributes */
 108         char name[32];                          /* room for node file name */
 109 };
 110
 111 /* Dynamic device node group */
 112 struct applesmc_node_group {
 113         char *format;                           /* format string */
 114         void *show;                             /* show function */
 115         void *store;                            /* store function */
 116         int option;                             /* function argument */
 117         struct applesmc_dev_attr *nodes;        /* dynamic node array */
 118 };
 119
 120 /* AppleSMC entry - cached register information */
 121 struct applesmc_entry {
 122         char key[5];            /* four-letter key code */
 123         u8 valid;               /* set when entry is successfully read once */
 124         u8 len;                 /* bounded by APPLESMC_MAX_DATA_LENGTH */
 125         char type[5];           /* four-letter type code */
 126         u8 flags;               /* 0x10: func; 0x40: write; 0x80: read */
 127 };
 128
 129 /* Register lookup and registers common to all SMCs */
 130 static struct applesmc_registers {
 131         struct mutex mutex;             /* register read/write mutex */
 132         unsigned int key_count;         /* number of SMC registers */
 133         unsigned int fan_count;         /* number of fans */
 134         unsigned int temp_count;        /* number of temperature registers */
 135         unsigned int temp_begin;        /* temperature lower index bound */
 136         unsigned int temp_end;          /* temperature upper index bound */
 137         unsigned int index_count;       /* size of temperature index array */
 138         int num_light_sensors;          /* number of light sensors */
 139         bool has_accelerometer;         /* has motion sensor */
 140         bool has_key_backlight;         /* has keyboard backlight */
 141         bool init_complete;             /* true when fully initialized */
 142         struct applesmc_entry *cache;   /* cached key entries */
 143         const char **index;             /* temperature key index */
 144 } smcreg = {
 145         .mutex = __MUTEX_INITIALIZER(smcreg.mutex),
 146 };
 147
 148 static const int debug;
 149 static struct platform_device *pdev;
 150 static s16 rest_x;
 151 static s16 rest_y;
 152 static u8 backlight_state[2];
 153
 154 static struct device *hwmon_dev;
 155 static struct input_polled_dev *applesmc_idev;
 156
 157 /*
 158  * Last index written to key_at_index sysfs file, and value to use for all other
 159  * key_at_index_* sysfs files.
 160  */
 161 static unsigned int key_at_index;
 162
 163 static struct workqueue_struct *applesmc_led_wq;
 164
 165 /*
 166  * wait_read - Wait for a byte to appear on SMC port. Callers must
 167  * hold applesmc_lock.
 168  */
 169 static int wait_read(void)
 170 {
 171         u8 status;
 172         int us;
 173         for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
 174                 udelay(us);
 175                 status = inb(APPLESMC_CMD_PORT);
 176                 /* read: wait for smc to settle */
 177                 if (status & 0x01)
 178                         return 0;
 179         }
 180
 181         pr_warn("wait_read() fail: 0x%02x\n", status);
 182         return -EIO;
 183 }
 184
 185 /*
 186  * send_byte - Write to SMC port, retrying when necessary. Callers
 187  * must hold applesmc_lock.
 188  */
 189 static int send_byte(u8 cmd, u16 port)
 190 {
 191         u8 status;
 192         int us;
 193
 194         outb(cmd, port);
 195         for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
 196                 udelay(us);
 197                 status = inb(APPLESMC_CMD_PORT);
 198                 /* write: wait for smc to settle */
 199                 if (status & 0x02)
 200                         continue;
 201                 /* ready: cmd accepted, return */
 202                 if (status & 0x04)
 203                         return 0;
 204                 /* timeout: give up */
 205                 if (us << 1 == APPLESMC_MAX_WAIT)
 206                         break;
 207                 /* busy: long wait and resend */
 208                 udelay(APPLESMC_RETRY_WAIT);
 209                 outb(cmd, port);
 210         }
 211
 212         pr_warn("send_byte(0x%02x, 0x%04x) fail: 0x%02x\n", cmd, port, status);
 213         return -EIO;
 214 }
 215
 216 static int send_command(u8 cmd)
 217 {
 218         return send_byte(cmd, APPLESMC_CMD_PORT);
 219 }
 220
 221 static int send_argument(const char *key)
 222 {
 223         int i;
 224
 225         for (i = 0; i < 4; i++)
 226                 if (send_byte(key[i], APPLESMC_DATA_PORT))
 227                         return -EIO;
 228         return 0;
 229 }
 230
 231 static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
 232 {
 233         u8 status, data = 0;
 234         int i;
 235
 236         if (send_command(cmd) || send_argument(key)) {
 237                 pr_warn("%.4s: read arg fail\n", key);
 238                 return -EIO;
 239         }
 240
 241         /* This has no effect on newer (2012) SMCs */
 242         if (send_byte(len, APPLESMC_DATA_PORT)) {
 243                 pr_warn("%.4s: read len fail\n", key);
 244                 return -EIO;
 245         }
 246
 247         for (i = 0; i < len; i++) {
 248                 if (wait_read()) {
 249                         pr_warn("%.4s: read data[%d] fail\n", key, i);
 250                         return -EIO;
 251                 }
 252                 buffer[i] = inb(APPLESMC_DATA_PORT);
 253         }
 254
 255         /* Read the data port until bit0 is cleared */
 256         for (i = 0; i < 16; i++) {
 257                 udelay(APPLESMC_MIN_WAIT);
 258                 status = inb(APPLESMC_CMD_PORT);
 259                 if (!(status & 0x01))
 260                         break;
 261                 data = inb(APPLESMC_DATA_PORT);
 262         }
 263         if (i)
 264                 pr_warn("flushed %d bytes, last value is: %d\n", i, data);
 265
 266         return 0;
 267 }
 268
 269 static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
 270 {
 271         int i;
 272
 273         if (send_command(cmd) || send_argument(key)) {
 274                 pr_warn("%s: write arg fail\n", key);
 275                 return -EIO;
 276         }
 277
 278         if (send_byte(len, APPLESMC_DATA_PORT)) {
 279                 pr_warn("%.4s: write len fail\n", key);
 280                 return -EIO;
 281         }
 282
 283         for (i = 0; i < len; i++) {
 284                 if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
 285                         pr_warn("%s: write data fail\n", key);
 286                         return -EIO;
 287                 }
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int read_register_count(unsigned int *count)
 294 {
 295         __be32 be;
 296         int ret;
 297
 298         ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
 299         if (ret)
 300                 return ret;
 301
 302         *count = be32_to_cpu(be);
 303         return 0;
 304 }
 305
 306 /*
 307  * Serialized I/O
 308  *
 309  * Returns zero on success or a negative error on failure.
 310  * All functions below are concurrency safe - callers should NOT hold lock.
 311  */
 312
 313 static int applesmc_read_entry(const struct applesmc_entry *entry,
 314                                u8 *buf, u8 len)
 315 {
 316         int ret;
 317
 318         if (entry->len != len)
 319                 return -EINVAL;
 320         mutex_lock(&smcreg.mutex);
 321         ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
 322         mutex_unlock(&smcreg.mutex);
 323
 324         return ret;
 325 }
 326
 327 static int applesmc_write_entry(const struct applesmc_entry *entry,
 328                                 const u8 *buf, u8 len)
 329 {
 330         int ret;
 331
 332         if (entry->len != len)
 333                 return -EINVAL;
 334         mutex_lock(&smcreg.mutex);
 335         ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
 336         mutex_unlock(&smcreg.mutex);
 337         return ret;
 338 }
 339
 340 static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
 341 {
 342         struct applesmc_entry *cache = &smcreg.cache[index];
 343         u8 key[4], info[6];
 344         __be32 be;
 345         int ret = 0;
 346
 347         if (cache->valid)
 348                 return cache;
 349
 350         mutex_lock(&smcreg.mutex);
 351
 352         if (cache->valid)
 353                 goto out;
 354         be = cpu_to_be32(index);
 355         ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
 356         if (ret)
 357                 goto out;
 358         ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
 359         if (ret)
 360                 goto out;
 361
 362         memcpy(cache->key, key, 4);
 363         cache->len = info[0];
 364         memcpy(cache->type, &info[1], 4);
 365         cache->flags = info[5];
 366         cache->valid = 1;
 367
 368 out:
 369         mutex_unlock(&smcreg.mutex);
 370         if (ret)
 371                 return ERR_PTR(ret);
 372         return cache;
 373 }
 374
 375 static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
 376 {
 377         int begin = 0, end = smcreg.key_count;
 378         const struct applesmc_entry *entry;
 379
 380         while (begin != end) {
 381                 int middle = begin + (end - begin) / 2;
 382                 entry = applesmc_get_entry_by_index(middle);
 383                 if (IS_ERR(entry)) {
 384                         *lo = 0;
 385                         return PTR_ERR(entry);
 386                 }
 387                 if (strcmp(entry->key, key) < 0)
 388                         begin = middle + 1;
 389                 else
 390                         end = middle;
 391         }
 392
 393         *lo = begin;
 394         return 0;
 395 }
 396
 397 static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
 398 {
 399         int begin = 0, end = smcreg.key_count;
 400         const struct applesmc_entry *entry;
 401
 402         while (begin != end) {
 403                 int middle = begin + (end - begin) / 2;
 404                 entry = applesmc_get_entry_by_index(middle);
 405                 if (IS_ERR(entry)) {
 406                         *hi = smcreg.key_count;
 407                         return PTR_ERR(entry);
 408                 }
 409                 if (strcmp(key, entry->key) < 0)
 410                         end = middle;
 411                 else
 412                         begin = middle + 1;
 413         }
 414
 415         *hi = begin;
 416         return 0;
 417 }
 418
 419 static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
 420 {
 421         int begin, end;
 422         int ret;
 423
 424         ret = applesmc_get_lower_bound(&begin, key);
 425         if (ret)
 426                 return ERR_PTR(ret);
 427         ret = applesmc_get_upper_bound(&end, key);
 428         if (ret)
 429                 return ERR_PTR(ret);
 430         if (end - begin != 1)
 431                 return ERR_PTR(-EINVAL);
 432
 433         return applesmc_get_entry_by_index(begin);
 434 }
 435
 436 static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
 437 {
 438         const struct applesmc_entry *entry;
 439
 440         entry = applesmc_get_entry_by_key(key);
 441         if (IS_ERR(entry))
 442                 return PTR_ERR(entry);
 443
 444         return applesmc_read_entry(entry, buffer, len);
 445 }
 446
 447 static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
 448 {
 449         const struct applesmc_entry *entry;
 450
 451         entry = applesmc_get_entry_by_key(key);
 452         if (IS_ERR(entry))
 453                 return PTR_ERR(entry);
 454
 455         return applesmc_write_entry(entry, buffer, len);
 456 }
 457
 458 static int applesmc_has_key(const char *key, bool *value)
 459 {
 460         const struct applesmc_entry *entry;
 461
 462         entry = applesmc_get_entry_by_key(key);
 463         if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
 464                 return PTR_ERR(entry);
 465
 466         *value = !IS_ERR(entry);
 467         return 0;
 468 }
 469
 470 /*
 471  * applesmc_read_s16 - Read 16-bit signed big endian register
 472  */
 473 static int applesmc_read_s16(const char *key, s16 *value)
 474 {
 475         u8 buffer[2];
 476         int ret;
 477
 478         ret = applesmc_read_key(key, buffer, 2);
 479         if (ret)
 480                 return ret;
 481
 482         *value = ((s16)buffer[0] << 8) | buffer[1];
 483         return 0;
 484 }
 485
 486 /*
 487  * applesmc_device_init - initialize the accelerometer.  Can sleep.
 488  */
 489 static void applesmc_device_init(void)
 490 {
 491         int total;
 492         u8 buffer[2];
 493
 494         if (!smcreg.has_accelerometer)
 495                 return;
 496
 497         for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
 498                 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
 499                                 (buffer[0] != 0x00 || buffer[1] != 0x00))
 500                         return;
 501                 buffer[0] = 0xe0;
 502                 buffer[1] = 0x00;
 503                 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
 504                 msleep(INIT_WAIT_MSECS);
 505         }
 506
 507         pr_warn("failed to init the device\n");
 508 }
 509
 510 static int applesmc_init_index(struct applesmc_registers *s)
 511 {
 512         const struct applesmc_entry *entry;
 513         unsigned int i;
 514
 515         if (s->index)
 516                 return 0;
 517
 518         s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
 519         if (!s->index)
 520                 return -ENOMEM;
 521
 522         for (i = s->temp_begin; i < s->temp_end; i++) {
 523                 entry = applesmc_get_entry_by_index(i);
 524                 if (IS_ERR(entry))
 525                         continue;
 526                 if (strcmp(entry->type, TEMP_SENSOR_TYPE))
 527                         continue;
 528                 s->index[s->index_count++] = entry->key;
 529         }
 530
 531         return 0;
 532 }
 533
 534 /*
 535  * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
 536  */
 537 static int applesmc_init_smcreg_try(void)
 538 {
 539         struct applesmc_registers *s = &smcreg;
 540         bool left_light_sensor = 0, right_light_sensor = 0;
 541         unsigned int count;
 542         u8 tmp[1];
 543         int ret;
 544
 545         if (s->init_complete)
 546                 return 0;
 547
 548         ret = read_register_count(&count);
 549         if (ret)
 550                 return ret;
 551
 552         if (s->cache && s->key_count != count) {
 553                 pr_warn("key count changed from %d to %d\n",
 554                         s->key_count, count);
 555                 kfree(s->cache);
 556                 s->cache = NULL;
 557         }
 558         s->key_count = count;
 559
 560         if (!s->cache)
 561                 s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
 562         if (!s->cache)
 563                 return -ENOMEM;
 564
 565         ret = applesmc_read_key(FANS_COUNT, tmp, 1);
 566         if (ret)
 567                 return ret;
 568         s->fan_count = tmp[0];
 569
 570         ret = applesmc_get_lower_bound(&s->temp_begin, "T");
 571         if (ret)
 572                 return ret;
 573         ret = applesmc_get_lower_bound(&s->temp_end, "U");
 574         if (ret)
 575                 return ret;
 576         s->temp_count = s->temp_end - s->temp_begin;
 577
 578         ret = applesmc_init_index(s);
 579         if (ret)
 580                 return ret;
 581
 582         ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
 583         if (ret)
 584                 return ret;
 585         ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
 586         if (ret)
 587                 return ret;
 588         ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
 589         if (ret)
 590                 return ret;
 591         ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
 592         if (ret)
 593                 return ret;
 594
 595         s->num_light_sensors = left_light_sensor + right_light_sensor;
 596         s->init_complete = true;
 597
 598         pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
 599                s->key_count, s->fan_count, s->temp_count, s->index_count,
 600                s->has_accelerometer,
 601                s->num_light_sensors,
 602                s->has_key_backlight);
 603
 604         return 0;
 605 }
 606
 607 static void applesmc_destroy_smcreg(void)
 608 {
 609         kfree(smcreg.index);
 610         smcreg.index = NULL;
 611         kfree(smcreg.cache);
 612         smcreg.cache = NULL;
 613         smcreg.init_complete = false;
 614 }
 615
 616 /*
 617  * applesmc_init_smcreg - Initialize register cache.
 618  *
 619  * Retries until initialization is successful, or the operation times out.
 620  *
 621  */
 622 static int applesmc_init_smcreg(void)
 623 {
 624         int ms, ret;
 625
 626         for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
 627                 ret = applesmc_init_smcreg_try();
 628                 if (!ret) {
 629                         if (ms)
 630                                 pr_info("init_smcreg() took %d ms\n", ms);
 631                         return 0;
 632                 }
 633                 msleep(INIT_WAIT_MSECS);
 634         }
 635
 636         applesmc_destroy_smcreg();
 637
 638         return ret;
 639 }
 640
 641 /* Device model stuff */
 642 static int applesmc_probe(struct platform_device *dev)
 643 {
 644         int ret;
 645
 646         ret = applesmc_init_smcreg();
 647         if (ret)
 648                 return ret;
 649
 650         applesmc_device_init();
 651
 652         return 0;
 653 }
 654
 655 /* Synchronize device with memorized backlight state */
 656 static int applesmc_pm_resume(struct device *dev)
 657 {
 658         if (smcreg.has_key_backlight)
 659                 applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
 660         return 0;
 661 }
 662
 663 /* Reinitialize device on resume from hibernation */
 664 static int applesmc_pm_restore(struct device *dev)
 665 {
 666         applesmc_device_init();
 667         return applesmc_pm_resume(dev);
 668 }
 669
 670 static const struct dev_pm_ops applesmc_pm_ops = {
 671         .resume = applesmc_pm_resume,
 672         .restore = applesmc_pm_restore,
 673 };
 674
 675 static struct platform_driver applesmc_driver = {
 676         .probe = applesmc_probe,
 677         .driver = {
 678                 .name = "applesmc",
 679                 .pm = &applesmc_pm_ops,
 680         },
 681 };
 682
 683 /*
 684  * applesmc_calibrate - Set our "resting" values.  Callers must
 685  * hold applesmc_lock.
 686  */
 687 static void applesmc_calibrate(void)
 688 {
 689         applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
 690         applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
 691         rest_x = -rest_x;
 692 }
 693
 694 static void applesmc_idev_poll(struct input_polled_dev *dev)
 695 {
 696         struct input_dev *idev = dev->input;
 697         s16 x, y;
 698
 699         if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
 700                 return;
 701         if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
 702                 return;
 703
 704         x = -x;
 705         input_report_abs(idev, ABS_X, x - rest_x);
 706         input_report_abs(idev, ABS_Y, y - rest_y);
 707         input_sync(idev);
 708 }
 709
 710 /* Sysfs Files */
 711
 712 static ssize_t applesmc_name_show(struct device *dev,
 713                                    struct device_attribute *attr, char *buf)
 714 {
 715         return snprintf(buf, PAGE_SIZE, "applesmc\n");
 716 }
 717
 718 static ssize_t applesmc_position_show(struct device *dev,
 719                                    struct device_attribute *attr, char *buf)
 720 {
 721         int ret;
 722         s16 x, y, z;
 723
 724         ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
 725         if (ret)
 726                 goto out;
 727         ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
 728         if (ret)
 729                 goto out;
 730         ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
 731         if (ret)
 732                 goto out;
 733
 734 out:
 735         if (ret)
 736                 return ret;
 737         else
 738                 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
 739 }
 740
 741 static ssize_t applesmc_light_show(struct device *dev,
 742                                 struct device_attribute *attr, char *sysfsbuf)
 743 {
 744         const struct applesmc_entry *entry;
 745         static int data_length;
 746         int ret;
 747         u8 left = 0, right = 0;
 748         u8 buffer[10];
 749
 750         if (!data_length) {
 751                 entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
 752                 if (IS_ERR(entry))
 753                         return PTR_ERR(entry);
 754                 if (entry->len > 10)
 755                         return -ENXIO;
 756                 data_length = entry->len;
 757                 pr_info("light sensor data length set to %d\n", data_length);
 758         }
 759
 760         ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
 761         /* newer macbooks report a single 10-bit bigendian value */
 762         if (data_length == 10) {
 763                 left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
 764                 goto out;
 765         }
 766         left = buffer[2];
 767         if (ret)
 768                 goto out;
 769         ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
 770         right = buffer[2];
 771
 772 out:
 773         if (ret)
 774                 return ret;
 775         else
 776                 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
 777 }
 778
 779 /* Displays sensor key as label */
 780 static ssize_t applesmc_show_sensor_label(struct device *dev,
 781                         struct device_attribute *devattr, char *sysfsbuf)
 782 {
 783         const char *key = smcreg.index[to_index(devattr)];
 784
 785         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
 786 }
 787
 788 /* Displays degree Celsius * 1000 */
 789 static ssize_t applesmc_show_temperature(struct device *dev,
 790                         struct device_attribute *devattr, char *sysfsbuf)
 791 {
 792         const char *key = smcreg.index[to_index(devattr)];
 793         int ret;
 794         s16 value;
 795         int temp;
 796
 797         ret = applesmc_read_s16(key, &value);
 798         if (ret)
 799                 return ret;
 800
 801         temp = 250 * (value >> 6);
 802
 803         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp);
 804 }
 805
 806 static ssize_t applesmc_show_fan_speed(struct device *dev,
 807                                 struct device_attribute *attr, char *sysfsbuf)
 808 {
 809         int ret;
 810         unsigned int speed = 0;
 811         char newkey[5];
 812         u8 buffer[2];
 813
 814         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
 815
 816         ret = applesmc_read_key(newkey, buffer, 2);
 817         speed = ((buffer[0] << 8 | buffer[1]) >> 2);
 818
 819         if (ret)
 820                 return ret;
 821         else
 822                 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
 823 }
 824
 825 static ssize_t applesmc_store_fan_speed(struct device *dev,
 826                                         struct device_attribute *attr,
 827                                         const char *sysfsbuf, size_t count)
 828 {
 829         int ret;
 830         unsigned long speed;
 831         char newkey[5];
 832         u8 buffer[2];
 833
 834         if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
 835                 return -EINVAL;         /* Bigger than a 14-bit value */
 836
 837         sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));
 838
 839         buffer[0] = (speed >> 6) & 0xff;
 840         buffer[1] = (speed << 2) & 0xff;
 841         ret = applesmc_write_key(newkey, buffer, 2);
 842
 843         if (ret)
 844                 return ret;
 845         else
 846                 return count;
 847 }
 848
 849 static ssize_t applesmc_show_fan_manual(struct device *dev,
 850                         struct device_attribute *attr, char *sysfsbuf)
 851 {
 852         int ret;
 853         u16 manual = 0;
 854         u8 buffer[2];
 855
 856         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 857         manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;
 858
 859         if (ret)
 860                 return ret;
 861         else
 862                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
 863 }
 864
 865 static ssize_t applesmc_store_fan_manual(struct device *dev,
 866                                          struct device_attribute *attr,
 867                                          const char *sysfsbuf, size_t count)
 868 {
 869         int ret;
 870         u8 buffer[2];
 871         unsigned long input;
 872         u16 val;
 873
 874         if (kstrtoul(sysfsbuf, 10, &input) < 0)
 875                 return -EINVAL;
 876
 877         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 878         val = (buffer[0] << 8 | buffer[1]);
 879         if (ret)
 880                 goto out;
 881
 882         if (input)
 883                 val = val | (0x01 << to_index(attr));
 884         else
 885                 val = val & ~(0x01 << to_index(attr));
 886
 887         buffer[0] = (val >> 8) & 0xFF;
 888         buffer[1] = val & 0xFF;
 889
 890         ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
 891
 892 out:
 893         if (ret)
 894                 return ret;
 895         else
 896                 return count;
 897 }
 898
 899 static ssize_t applesmc_show_fan_position(struct device *dev,
 900                                 struct device_attribute *attr, char *sysfsbuf)
 901 {
 902         int ret;
 903         char newkey[5];
 904         u8 buffer[17];
 905
 906         sprintf(newkey, FAN_ID_FMT, to_index(attr));
 907
 908         ret = applesmc_read_key(newkey, buffer, 16);
 909         buffer[16] = 0;
 910
 911         if (ret)
 912                 return ret;
 913         else
 914                 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
 915 }
 916
 917 static ssize_t applesmc_calibrate_show(struct device *dev,
 918                                 struct device_attribute *attr, char *sysfsbuf)
 919 {
 920         return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
 921 }
 922
 923 static ssize_t applesmc_calibrate_store(struct device *dev,
 924         struct device_attribute *attr, const char *sysfsbuf, size_t count)
 925 {
 926         applesmc_calibrate();
 927
 928         return count;
 929 }
 930
 931 static void applesmc_backlight_set(struct work_struct *work)
 932 {
 933         applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
 934 }
 935 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
 936
 937 static void applesmc_brightness_set(struct led_classdev *led_cdev,
 938                                                 enum led_brightness value)
 939 {
 940         int ret;
 941
 942         backlight_state[0] = value;
 943         ret = queue_work(applesmc_led_wq, &backlight_work);
 944
 945         if (debug && (!ret))
 946                 dev_dbg(led_cdev->dev, "work was already on the queue.\n");
 947 }
 948
 949 static ssize_t applesmc_key_count_show(struct device *dev,
 950                                 struct device_attribute *attr, char *sysfsbuf)
 951 {
 952         int ret;
 953         u8 buffer[4];
 954         u32 count;
 955
 956         ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
 957         count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
 958                                                 ((u32)buffer[2]<<8) + buffer[3];
 959
 960         if (ret)
 961                 return ret;
 962         else
 963                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
 964 }
 965
 966 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
 967                                 struct device_attribute *attr, char *sysfsbuf)
 968 {
 969         const struct applesmc_entry *entry;
 970         int ret;
 971
 972         entry = applesmc_get_entry_by_index(key_at_index);
 973         if (IS_ERR(entry))
 974                 return PTR_ERR(entry);
 975         ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
 976         if (ret)
 977                 return ret;
 978
 979         return entry->len;
 980 }
 981
 982 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
 983                                 struct device_attribute *attr, char *sysfsbuf)
 984 {
 985         const struct applesmc_entry *entry;
 986
 987         entry = applesmc_get_entry_by_index(key_at_index);
 988         if (IS_ERR(entry))
 989                 return PTR_ERR(entry);
 990
 991         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
 992 }
 993
 994 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
 995                                 struct device_attribute *attr, char *sysfsbuf)
 996 {
 997         const struct applesmc_entry *entry;
 998
 999         entry = applesmc_get_entry_by_index(key_at_index);
1000         if (IS_ERR(entry))
1001                 return PTR_ERR(entry);
1002
1003         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
1004 }
1005
1006 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
1007                                 struct device_attribute *attr, char *sysfsbuf)
1008 {
1009         const struct applesmc_entry *entry;
1010
1011         entry = applesmc_get_entry_by_index(key_at_index);
1012         if (IS_ERR(entry))
1013                 return PTR_ERR(entry);
1014
1015         return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
1016 }
1017
1018 static ssize_t applesmc_key_at_index_show(struct device *dev,
1019                                 struct device_attribute *attr, char *sysfsbuf)
1020 {
1021         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
1022 }
1023
1024 static ssize_t applesmc_key_at_index_store(struct device *dev,
1025         struct device_attribute *attr, const char *sysfsbuf, size_t count)
1026 {
1027         unsigned long newkey;
1028
1029         if (kstrtoul(sysfsbuf, 10, &newkey) < 0
1030             || newkey >= smcreg.key_count)
1031                 return -EINVAL;
1032
1033         key_at_index = newkey;
1034         return count;
1035 }
1036
1037 static struct led_classdev applesmc_backlight = {
1038         .name                   = "smc::kbd_backlight",
1039         .default_trigger        = "nand-disk",
1040         .brightness_set         = applesmc_brightness_set,
1041 };
1042
1043 static struct applesmc_node_group info_group[] = {
1044         { "name", applesmc_name_show },
1045         { "key_count", applesmc_key_count_show },
1046         { "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
1047         { "key_at_index_name", applesmc_key_at_index_name_show },
1048         { "key_at_index_type", applesmc_key_at_index_type_show },
1049         { "key_at_index_data_length", applesmc_key_at_index_data_length_show },
1050         { "key_at_index_data", applesmc_key_at_index_read_show },
1051         { }
1052 };
1053
1054 static struct applesmc_node_group accelerometer_group[] = {
1055         { "position", applesmc_position_show },
1056         { "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
1057         { }
1058 };
1059
1060 static struct applesmc_node_group light_sensor_group[] = {
1061         { "light", applesmc_light_show },
1062         { }
1063 };
1064
1065 static struct applesmc_node_group fan_group[] = {
1066         { "fan%d_label", applesmc_show_fan_position },
1067         { "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
1068         { "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
1069         { "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
1070         { "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
1071         { "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
1072         { "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
1073         { }
1074 };
1075
1076 static struct applesmc_node_group temp_group[] = {
1077         { "temp%d_label", applesmc_show_sensor_label },
1078         { "temp%d_input", applesmc_show_temperature },
1079         { }
1080 };
1081
1082 /* Module stuff */
1083
1084 /*
1085  * applesmc_destroy_nodes - remove files and free associated memory
1086  */
1087 static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
1088 {
1089         struct applesmc_node_group *grp;
1090         struct applesmc_dev_attr *node;
1091
1092         for (grp = groups; grp->nodes; grp++) {
1093                 for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
1094                         sysfs_remove_file(&pdev->dev.kobj,
1095                                           &node->sda.dev_attr.attr);
1096                 kfree(grp->nodes);
1097                 grp->nodes = NULL;
1098         }
1099 }
1100
1101 /*
1102  * applesmc_create_nodes - create a two-dimensional group of sysfs files
1103  */
1104 static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
1105 {
1106         struct applesmc_node_group *grp;
1107         struct applesmc_dev_attr *node;
1108         struct attribute *attr;
1109         int ret, i;
1110
1111         for (grp = groups; grp->format; grp++) {
1112                 grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
1113                 if (!grp->nodes) {
1114                         ret = -ENOMEM;
1115                         goto out;
1116                 }
1117                 for (i = 0; i < num; i++) {
1118                         node = &grp->nodes[i];
1119                         sprintf(node->name, grp->format, i + 1);
1120                         node->sda.index = (grp->option << 16) | (i & 0xffff);
1121                         node->sda.dev_attr.show = grp->show;
1122                         node->sda.dev_attr.store = grp->store;
1123                         attr = &node->sda.dev_attr.attr;
1124                         sysfs_attr_init(attr);
1125                         attr->name = node->name;
1126                         attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
1127                         ret = sysfs_create_file(&pdev->dev.kobj, attr);
1128                         if (ret) {
1129                                 attr->name = NULL;
1130                                 goto out;
1131                         }
1132                 }
1133         }
1134
1135         return 0;
1136 out:
1137         applesmc_destroy_nodes(groups);
1138         return ret;
1139 }
1140
1141 /* Create accelerometer resources */
1142 static int applesmc_create_accelerometer(void)
1143 {
1144         struct input_dev *idev;
1145         int ret;
1146
1147         if (!smcreg.has_accelerometer)
1148                 return 0;
1149
1150         ret = applesmc_create_nodes(accelerometer_group, 1);
1151         if (ret)
1152                 goto out;
1153
1154         applesmc_idev = input_allocate_polled_device();
1155         if (!applesmc_idev) {
1156                 ret = -ENOMEM;
1157                 goto out_sysfs;
1158         }
1159
1160         applesmc_idev->poll = applesmc_idev_poll;
1161         applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;
1162
1163         /* initial calibrate for the input device */
1164         applesmc_calibrate();
1165
1166         /* initialize the input device */
1167         idev = applesmc_idev->input;
1168         idev->name = "applesmc";
1169         idev->id.bustype = BUS_HOST;
1170         idev->dev.parent = &pdev->dev;
1171         idev->evbit[0] = BIT_MASK(EV_ABS);
1172         input_set_abs_params(idev, ABS_X,
1173                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1174         input_set_abs_params(idev, ABS_Y,
1175                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1176
1177         ret = input_register_polled_device(applesmc_idev);
1178         if (ret)
1179                 goto out_idev;
1180
1181         return 0;
1182
1183 out_idev:
1184         input_free_polled_device(applesmc_idev);
1185
1186 out_sysfs:
1187         applesmc_destroy_nodes(accelerometer_group);
1188
1189 out:
1190         pr_warn("driver init failed (ret=%d)!\n", ret);
1191         return ret;
1192 }
1193
1194 /* Release all resources used by the accelerometer */
1195 static void applesmc_release_accelerometer(void)
1196 {
1197         if (!smcreg.has_accelerometer)
1198                 return;
1199         input_unregister_polled_device(applesmc_idev);
1200         input_free_polled_device(applesmc_idev);
1201         applesmc_destroy_nodes(accelerometer_group);
1202 }
1203
1204 static int applesmc_create_light_sensor(void)
1205 {
1206         if (!smcreg.num_light_sensors)
1207                 return 0;
1208         return applesmc_create_nodes(light_sensor_group, 1);
1209 }
1210
1211 static void applesmc_release_light_sensor(void)
1212 {
1213         if (!smcreg.num_light_sensors)
1214                 return;
1215         applesmc_destroy_nodes(light_sensor_group);
1216 }
1217
1218 static int applesmc_create_key_backlight(void)
1219 {
1220         if (!smcreg.has_key_backlight)
1221                 return 0;
1222         applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1223         if (!applesmc_led_wq)
1224                 return -ENOMEM;
1225         return led_classdev_register(&pdev->dev, &applesmc_backlight);
1226 }
1227
1228 static void applesmc_release_key_backlight(void)
1229 {
1230         if (!smcreg.has_key_backlight)
1231                 return;
1232         led_classdev_unregister(&applesmc_backlight);
1233         destroy_workqueue(applesmc_led_wq);
1234 }
1235
1236 static int applesmc_dmi_match(const struct dmi_system_id *id)
1237 {
1238         return 1;
1239 }
1240
1241 /*
1242  * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1243  * So we need to put "Apple MacBook Pro" before "Apple MacBook".
1244  */
1245 static __initdata struct dmi_system_id applesmc_whitelist[] = {
1246         { applesmc_dmi_match, "Apple MacBook Air", {
1247           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1248           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
1249         },
1250         { applesmc_dmi_match, "Apple MacBook Pro", {
1251           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1252           DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
1253         },
1254         { applesmc_dmi_match, "Apple MacBook", {
1255           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1256           DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
1257         },
1258         { applesmc_dmi_match, "Apple Macmini", {
1259           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1260           DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
1261         },
1262         { applesmc_dmi_match, "Apple MacPro", {
1263           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1264           DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
1265         },
1266         { applesmc_dmi_match, "Apple iMac", {
1267           DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
1268           DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
1269         },
1270         { .ident = NULL }
1271 };
1272
1273 static int __init applesmc_init(void)
1274 {
1275         int ret;
1276
1277         if (!dmi_check_system(applesmc_whitelist)) {
1278                 pr_warn("supported laptop not found!\n");
1279                 ret = -ENODEV;
1280                 goto out;
1281         }
1282
1283         if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1284                                                                 "applesmc")) {
1285                 ret = -ENXIO;
1286                 goto out;
1287         }
1288
1289         ret = platform_driver_register(&applesmc_driver);
1290         if (ret)
1291                 goto out_region;
1292
1293         pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
1294                                                NULL, 0);
1295         if (IS_ERR(pdev)) {
1296                 ret = PTR_ERR(pdev);
1297                 goto out_driver;
1298         }
1299
1300         /* create register cache */
1301         ret = applesmc_init_smcreg();
1302         if (ret)
1303                 goto out_device;
1304
1305         ret = applesmc_create_nodes(info_group, 1);
1306         if (ret)
1307                 goto out_smcreg;
1308
1309         ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
1310         if (ret)
1311                 goto out_info;
1312
1313         ret = applesmc_create_nodes(temp_group, smcreg.index_count);
1314         if (ret)
1315                 goto out_fans;
1316
1317         ret = applesmc_create_accelerometer();
1318         if (ret)
1319                 goto out_temperature;
1320
1321         ret = applesmc_create_light_sensor();
1322         if (ret)
1323                 goto out_accelerometer;
1324
1325         ret = applesmc_create_key_backlight();
1326         if (ret)
1327                 goto out_light_sysfs;
1328
1329         hwmon_dev = hwmon_device_register(&pdev->dev);
1330         if (IS_ERR(hwmon_dev)) {
1331                 ret = PTR_ERR(hwmon_dev);
1332                 goto out_light_ledclass;
1333         }
1334
1335         return 0;
1336
1337 out_light_ledclass:
1338         applesmc_release_key_backlight();
1339 out_light_sysfs:
1340         applesmc_release_light_sensor();
1341 out_accelerometer:
1342         applesmc_release_accelerometer();
1343 out_temperature:
1344         applesmc_destroy_nodes(temp_group);
1345 out_fans:
1346         applesmc_destroy_nodes(fan_group);
1347 out_info:
1348         applesmc_destroy_nodes(info_group);
1349 out_smcreg:
1350         applesmc_destroy_smcreg();
1351 out_device:
1352         platform_device_unregister(pdev);
1353 out_driver:
1354         platform_driver_unregister(&applesmc_driver);
1355 out_region:
1356         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1357 out:
1358         pr_warn("driver init failed (ret=%d)!\n", ret);
1359         return ret;
1360 }
1361
1362 static void __exit applesmc_exit(void)
1363 {
1364         hwmon_device_unregister(hwmon_dev);
1365         applesmc_release_key_backlight();
1366         applesmc_release_light_sensor();
1367         applesmc_release_accelerometer();
1368         applesmc_destroy_nodes(temp_group);
1369         applesmc_destroy_nodes(fan_group);
1370         applesmc_destroy_nodes(info_group);
1371         applesmc_destroy_smcreg();
1372         platform_device_unregister(pdev);
1373         platform_driver_unregister(&applesmc_driver);
1374         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1375 }
1376
1377 module_init(applesmc_init);
1378 module_exit(applesmc_exit);
1379
1380 MODULE_AUTHOR("Nicolas Boichat");
1381 MODULE_DESCRIPTION("Apple SMC");
1382 MODULE_LICENSE("GPL v2");
1383 MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);