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