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  *
   8  * Based on hdaps.c driver:
   9  * Copyright (C) 2005 Robert Love <rml@novell.com>
  10  * Copyright (C) 2005 Jesper Juhl <jesper.juhl@gmail.com>
  11  *
  12  * Fan control based on smcFanControl:
  13  * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
  14  *
  15  * This program is free software; you can redistribute it and/or modify it
  16  * under the terms of the GNU General Public License v2 as published by the
  17  * Free Software Foundation.
  18  *
  19  * This program is distributed in the hope that it will be useful, but WITHOUT
  20  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  21  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  22  * more details.
  23  *
  24  * You should have received a copy of the GNU General Public License along with
  25  * this program; if not, write to the Free Software Foundation, Inc.,
  26  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
  27  */
  28
  29 #include <linux/delay.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/input.h>
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/timer.h>
  35 #include <linux/dmi.h>
  36 #include <linux/mutex.h>
  37 #include <linux/hwmon-sysfs.h>
  38 #include <asm/io.h>
  39 #include <linux/leds.h>
  40 #include <linux/hwmon.h>
  41 #include <linux/workqueue.h>
  42
  43 /* data port used by Apple SMC */
  44 #define APPLESMC_DATA_PORT      0x300
  45 /* command/status port used by Apple SMC */
  46 #define APPLESMC_CMD_PORT       0x304
  47
  48 #define APPLESMC_NR_PORTS       32 /* 0x300-0x31f */
  49
  50 #define APPLESMC_MAX_DATA_LENGTH 32
  51
  52 #define APPLESMC_STATUS_MASK    0x0f
  53 #define APPLESMC_READ_CMD       0x10
  54 #define APPLESMC_WRITE_CMD      0x11
  55 #define APPLESMC_GET_KEY_BY_INDEX_CMD   0x12
  56 #define APPLESMC_GET_KEY_TYPE_CMD       0x13
  57
  58 #define KEY_COUNT_KEY           "#KEY" /* r-o ui32 */
  59
  60 #define LIGHT_SENSOR_LEFT_KEY   "ALV0" /* r-o {alv (6 bytes) */
  61 #define LIGHT_SENSOR_RIGHT_KEY  "ALV1" /* r-o {alv (6 bytes) */
  62 #define BACKLIGHT_KEY           "LKSB" /* w-o {lkb (2 bytes) */
  63
  64 #define CLAMSHELL_KEY           "MSLD" /* r-o ui8 (unused) */
  65
  66 #define MOTION_SENSOR_X_KEY     "MO_X" /* r-o sp78 (2 bytes) */
  67 #define MOTION_SENSOR_Y_KEY     "MO_Y" /* r-o sp78 (2 bytes) */
  68 #define MOTION_SENSOR_Z_KEY     "MO_Z" /* r-o sp78 (2 bytes) */
  69 #define MOTION_SENSOR_KEY       "MOCN" /* r/w ui16 */
  70
  71 #define FANS_COUNT              "FNum" /* r-o ui8 */
  72 #define FANS_MANUAL             "FS! " /* r-w ui16 */
  73 #define FAN_ACTUAL_SPEED        "F0Ac" /* r-o fpe2 (2 bytes) */
  74 #define FAN_MIN_SPEED           "F0Mn" /* r-o fpe2 (2 bytes) */
  75 #define FAN_MAX_SPEED           "F0Mx" /* r-o fpe2 (2 bytes) */
  76 #define FAN_SAFE_SPEED          "F0Sf" /* r-o fpe2 (2 bytes) */
  77 #define FAN_TARGET_SPEED        "F0Tg" /* r-w fpe2 (2 bytes) */
  78 #define FAN_POSITION            "F0ID" /* r-o char[16] */
  79
  80 /*
  81  * Temperature sensors keys (sp78 - 2 bytes).
  82  * First set for Macbook(Pro), second for Macmini.
  83  */
  84 static const char* temperature_sensors_sets[][13] = {
  85         { "TA0P", "TB0T", "TC0D", "TC0P", "TG0H", "TG0P", "TG0T", "Th0H",
  86           "Th1H", "Tm0P", "Ts0P", "Ts1P", NULL },
  87         { "TC0D", "TC0P", NULL }
  88 };
  89
  90 /* List of keys used to read/write fan speeds */
  91 static const char* fan_speed_keys[] = {
  92         FAN_ACTUAL_SPEED,
  93         FAN_MIN_SPEED,
  94         FAN_MAX_SPEED,
  95         FAN_SAFE_SPEED,
  96         FAN_TARGET_SPEED
  97 };
  98
  99 #define INIT_TIMEOUT_MSECS      5000    /* wait up to 5s for device init ... */
 100 #define INIT_WAIT_MSECS         50      /* ... in 50ms increments */
 101
 102 #define APPLESMC_POLL_PERIOD    (HZ/20) /* poll for input every 1/20s */
 103 #define APPLESMC_INPUT_FUZZ     4       /* input event threshold */
 104 #define APPLESMC_INPUT_FLAT     4
 105
 106 #define SENSOR_X 0
 107 #define SENSOR_Y 1
 108 #define SENSOR_Z 2
 109
 110 /* Structure to be passed to DMI_MATCH function */
 111 struct dmi_match_data {
 112 /* Indicates whether this computer has an accelerometer. */
 113         int accelerometer;
 114 /* Indicates whether this computer has light sensors and keyboard backlight. */
 115         int light;
 116 /* Indicates which temperature sensors set to use. */
 117         int temperature_set;
 118 };
 119
 120 static const int debug;
 121 static struct platform_device *pdev;
 122 static s16 rest_x;
 123 static s16 rest_y;
 124 static struct timer_list applesmc_timer;
 125 static struct input_dev *applesmc_idev;
 126 static struct class_device *hwmon_class_dev;
 127
 128 /* Indicates whether this computer has an accelerometer. */
 129 static unsigned int applesmc_accelerometer;
 130
 131 /* Indicates whether this computer has light sensors and keyboard backlight. */
 132 static unsigned int applesmc_light;
 133
 134 /* Indicates which temperature sensors set to use. */
 135 static unsigned int applesmc_temperature_set;
 136
 137 static struct mutex applesmc_lock;
 138
 139 /*
 140  * Last index written to key_at_index sysfs file, and value to use for all other
 141  * key_at_index_* sysfs files.
 142  */
 143 static unsigned int key_at_index;
 144
 145 static struct workqueue_struct *applesmc_led_wq;
 146
 147 /*
 148  * __wait_status - Wait up to 2ms for the status port to get a certain value
 149  * (masked with 0x0f), returning zero if the value is obtained.  Callers must
 150  * hold applesmc_lock.
 151  */
 152 static int __wait_status(u8 val)
 153 {
 154         unsigned int i;
 155
 156         val = val & APPLESMC_STATUS_MASK;
 157
 158         for (i = 0; i < 200; i++) {
 159                 if ((inb(APPLESMC_CMD_PORT) & APPLESMC_STATUS_MASK) == val) {
 160                         if (debug)
 161                                 printk(KERN_DEBUG
 162                                                 "Waited %d us for status %x\n",
 163                                                 i*10, val);
 164                         return 0;
 165                 }
 166                 udelay(10);
 167         }
 168
 169         printk(KERN_WARNING "applesmc: wait status failed: %x != %x\n",
 170                                                 val, inb(APPLESMC_CMD_PORT));
 171
 172         return -EIO;
 173 }
 174
 175 /*
 176  * applesmc_read_key - reads len bytes from a given key, and put them in buffer.
 177  * Returns zero on success or a negative error on failure. Callers must
 178  * hold applesmc_lock.
 179  */
 180 static int applesmc_read_key(const char* key, u8* buffer, u8 len)
 181 {
 182         int i;
 183
 184         if (len > APPLESMC_MAX_DATA_LENGTH) {
 185                 printk(KERN_ERR "applesmc_read_key: cannot read more than "
 186                                         "%d bytes\n", APPLESMC_MAX_DATA_LENGTH);
 187                 return -EINVAL;
 188         }
 189
 190         outb(APPLESMC_READ_CMD, APPLESMC_CMD_PORT);
 191         if (__wait_status(0x0c))
 192                 return -EIO;
 193
 194         for (i = 0; i < 4; i++) {
 195                 outb(key[i], APPLESMC_DATA_PORT);
 196                 if (__wait_status(0x04))
 197                         return -EIO;
 198         }
 199         if (debug)
 200                 printk(KERN_DEBUG "<%s", key);
 201
 202         outb(len, APPLESMC_DATA_PORT);
 203         if (debug)
 204                 printk(KERN_DEBUG ">%x", len);
 205
 206         for (i = 0; i < len; i++) {
 207                 if (__wait_status(0x05))
 208                         return -EIO;
 209                 buffer[i] = inb(APPLESMC_DATA_PORT);
 210                 if (debug)
 211                         printk(KERN_DEBUG "<%x", buffer[i]);
 212         }
 213         if (debug)
 214                 printk(KERN_DEBUG "\n");
 215
 216         return 0;
 217 }
 218
 219 /*
 220  * applesmc_write_key - writes len bytes from buffer to a given key.
 221  * Returns zero on success or a negative error on failure. Callers must
 222  * hold applesmc_lock.
 223  */
 224 static int applesmc_write_key(const char* key, u8* buffer, u8 len)
 225 {
 226         int i;
 227
 228         if (len > APPLESMC_MAX_DATA_LENGTH) {
 229                 printk(KERN_ERR "applesmc_write_key: cannot write more than "
 230                                         "%d bytes\n", APPLESMC_MAX_DATA_LENGTH);
 231                 return -EINVAL;
 232         }
 233
 234         outb(APPLESMC_WRITE_CMD, APPLESMC_CMD_PORT);
 235         if (__wait_status(0x0c))
 236                 return -EIO;
 237
 238         for (i = 0; i < 4; i++) {
 239                 outb(key[i], APPLESMC_DATA_PORT);
 240                 if (__wait_status(0x04))
 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                         return -EIO;
 249                 outb(buffer[i], APPLESMC_DATA_PORT);
 250         }
 251
 252         return 0;
 253 }
 254
 255 /*
 256  * applesmc_get_key_at_index - get key at index, and put the result in key
 257  * (char[6]). Returns zero on success or a negative error on failure. Callers
 258  * must hold applesmc_lock.
 259  */
 260 static int applesmc_get_key_at_index(int index, char* key)
 261 {
 262         int i;
 263         u8 readkey[4];
 264         readkey[0] = index >> 24;
 265         readkey[1] = index >> 16;
 266         readkey[2] = index >> 8;
 267         readkey[3] = index;
 268
 269         outb(APPLESMC_GET_KEY_BY_INDEX_CMD, APPLESMC_CMD_PORT);
 270         if (__wait_status(0x0c))
 271                 return -EIO;
 272
 273         for (i = 0; i < 4; i++) {
 274                 outb(readkey[i], APPLESMC_DATA_PORT);
 275                 if (__wait_status(0x04))
 276                         return -EIO;
 277         }
 278
 279         outb(4, APPLESMC_DATA_PORT);
 280
 281         for (i = 0; i < 4; i++) {
 282                 if (__wait_status(0x05))
 283                         return -EIO;
 284                 key[i] = inb(APPLESMC_DATA_PORT);
 285         }
 286         key[4] = 0;
 287
 288         return 0;
 289 }
 290
 291 /*
 292  * applesmc_get_key_type - get key type, and put the result in type (char[6]).
 293  * Returns zero on success or a negative error on failure. Callers must
 294  * hold applesmc_lock.
 295  */
 296 static int applesmc_get_key_type(char* key, char* type)
 297 {
 298         int i;
 299
 300         outb(APPLESMC_GET_KEY_TYPE_CMD, APPLESMC_CMD_PORT);
 301         if (__wait_status(0x0c))
 302                 return -EIO;
 303
 304         for (i = 0; i < 4; i++) {
 305                 outb(key[i], APPLESMC_DATA_PORT);
 306                 if (__wait_status(0x04))
 307                         return -EIO;
 308         }
 309
 310         outb(5, APPLESMC_DATA_PORT);
 311
 312         for (i = 0; i < 6; i++) {
 313                 if (__wait_status(0x05))
 314                         return -EIO;
 315                 type[i] = inb(APPLESMC_DATA_PORT);
 316         }
 317         type[5] = 0;
 318
 319         return 0;
 320 }
 321
 322 /*
 323  * applesmc_read_motion_sensor - Read motion sensor (X, Y or Z). Callers must
 324  * hold applesmc_lock.
 325  */
 326 static int applesmc_read_motion_sensor(int index, s16* value)
 327 {
 328         u8 buffer[2];
 329         int ret;
 330
 331         switch (index) {
 332         case SENSOR_X:
 333                 ret = applesmc_read_key(MOTION_SENSOR_X_KEY, buffer, 2);
 334                 break;
 335         case SENSOR_Y:
 336                 ret = applesmc_read_key(MOTION_SENSOR_Y_KEY, buffer, 2);
 337                 break;
 338         case SENSOR_Z:
 339                 ret = applesmc_read_key(MOTION_SENSOR_Z_KEY, buffer, 2);
 340                 break;
 341         default:
 342                 ret = -EINVAL;
 343         }
 344
 345         *value = ((s16)buffer[0] << 8) | buffer[1];
 346
 347         return ret;
 348 }
 349
 350 /*
 351  * applesmc_device_init - initialize the accelerometer.  Returns zero on success
 352  * and negative error code on failure.  Can sleep.
 353  */
 354 static int applesmc_device_init(void)
 355 {
 356         int total, ret = -ENXIO;
 357         u8 buffer[2];
 358
 359         if (!applesmc_accelerometer)
 360                 return 0;
 361
 362         mutex_lock(&applesmc_lock);
 363
 364         for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
 365                 if (debug)
 366                         printk(KERN_DEBUG "applesmc try %d\n", total);
 367                 if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
 368                                 (buffer[0] != 0x00 || buffer[1] != 0x00)) {
 369                         if (total == INIT_TIMEOUT_MSECS) {
 370                                 printk(KERN_DEBUG "applesmc: device has"
 371                                                 " already been initialized"
 372                                                 " (0x%02x, 0x%02x).\n",
 373                                                 buffer[0], buffer[1]);
 374                         } else {
 375                                 printk(KERN_DEBUG "applesmc: device"
 376                                                 " successfully initialized"
 377                                                 " (0x%02x, 0x%02x).\n",
 378                                                 buffer[0], buffer[1]);
 379                         }
 380                         ret = 0;
 381                         goto out;
 382                 }
 383                 buffer[0] = 0xe0;
 384                 buffer[1] = 0x00;
 385                 applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
 386                 msleep(INIT_WAIT_MSECS);
 387         }
 388
 389         printk(KERN_WARNING "applesmc: failed to init the device\n");
 390
 391 out:
 392         mutex_unlock(&applesmc_lock);
 393         return ret;
 394 }
 395
 396 /*
 397  * applesmc_get_fan_count - get the number of fans. Callers must NOT hold
 398  * applesmc_lock.
 399  */
 400 static int applesmc_get_fan_count(void)
 401 {
 402         int ret;
 403         u8 buffer[1];
 404
 405         mutex_lock(&applesmc_lock);
 406
 407         ret = applesmc_read_key(FANS_COUNT, buffer, 1);
 408
 409         mutex_unlock(&applesmc_lock);
 410         if (ret)
 411                 return ret;
 412         else
 413                 return buffer[0];
 414 }
 415
 416 /* Device model stuff */
 417 static int applesmc_probe(struct platform_device *dev)
 418 {
 419         int ret;
 420
 421         ret = applesmc_device_init();
 422         if (ret)
 423                 return ret;
 424
 425         printk(KERN_INFO "applesmc: device successfully initialized.\n");
 426         return 0;
 427 }
 428
 429 static int applesmc_resume(struct platform_device *dev)
 430 {
 431         return applesmc_device_init();
 432 }
 433
 434 static struct platform_driver applesmc_driver = {
 435         .probe = applesmc_probe,
 436         .resume = applesmc_resume,
 437         .driver = {
 438                 .name = "applesmc",
 439                 .owner = THIS_MODULE,
 440         },
 441 };
 442
 443 /*
 444  * applesmc_calibrate - Set our "resting" values.  Callers must
 445  * hold applesmc_lock.
 446  */
 447 static void applesmc_calibrate(void)
 448 {
 449         applesmc_read_motion_sensor(SENSOR_X, &rest_x);
 450         applesmc_read_motion_sensor(SENSOR_Y, &rest_y);
 451         rest_x = -rest_x;
 452 }
 453
 454 static int applesmc_idev_open(struct input_dev *dev)
 455 {
 456         add_timer(&applesmc_timer);
 457
 458         return 0;
 459 }
 460
 461 static void applesmc_idev_close(struct input_dev *dev)
 462 {
 463         del_timer_sync(&applesmc_timer);
 464 }
 465
 466 static void applesmc_idev_poll(unsigned long unused)
 467 {
 468         s16 x, y;
 469
 470         /* Cannot sleep.  Try nonblockingly.  If we fail, try again later. */
 471         if (!mutex_trylock(&applesmc_lock)) {
 472                 mod_timer(&applesmc_timer, jiffies + APPLESMC_POLL_PERIOD);
 473                 return;
 474         }
 475
 476         if (applesmc_read_motion_sensor(SENSOR_X, &x))
 477                 goto out;
 478         if (applesmc_read_motion_sensor(SENSOR_Y, &y))
 479                 goto out;
 480
 481         x = -x;
 482         input_report_abs(applesmc_idev, ABS_X, x - rest_x);
 483         input_report_abs(applesmc_idev, ABS_Y, y - rest_y);
 484         input_sync(applesmc_idev);
 485
 486 out:
 487         mod_timer(&applesmc_timer, jiffies + APPLESMC_POLL_PERIOD);
 488
 489         mutex_unlock(&applesmc_lock);
 490 }
 491
 492 /* Sysfs Files */
 493
 494 static ssize_t applesmc_position_show(struct device *dev,
 495                                    struct device_attribute *attr, char *buf)
 496 {
 497         int ret;
 498         s16 x, y, z;
 499
 500         mutex_lock(&applesmc_lock);
 501
 502         ret = applesmc_read_motion_sensor(SENSOR_X, &x);
 503         if (ret)
 504                 goto out;
 505         ret = applesmc_read_motion_sensor(SENSOR_Y, &y);
 506         if (ret)
 507                 goto out;
 508         ret = applesmc_read_motion_sensor(SENSOR_Z, &z);
 509         if (ret)
 510                 goto out;
 511
 512 out:
 513         mutex_unlock(&applesmc_lock);
 514         if (ret)
 515                 return ret;
 516         else
 517                 return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
 518 }
 519
 520 static ssize_t applesmc_light_show(struct device *dev,
 521                                 struct device_attribute *attr, char *sysfsbuf)
 522 {
 523         int ret;
 524         u8 left = 0, right = 0;
 525         u8 buffer[6];
 526
 527         mutex_lock(&applesmc_lock);
 528
 529         ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, 6);
 530         left = buffer[2];
 531         if (ret)
 532                 goto out;
 533         ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, 6);
 534         right = buffer[2];
 535
 536 out:
 537         mutex_unlock(&applesmc_lock);
 538         if (ret)
 539                 return ret;
 540         else
 541                 return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
 542 }
 543
 544 /* Displays degree Celsius * 1000 */
 545 static ssize_t applesmc_show_temperature(struct device *dev,
 546                         struct device_attribute *devattr, char *sysfsbuf)
 547 {
 548         int ret;
 549         u8 buffer[2];
 550         unsigned int temp;
 551         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 552         const char* key =
 553                 temperature_sensors_sets[applesmc_temperature_set][attr->index];
 554
 555         mutex_lock(&applesmc_lock);
 556
 557         ret = applesmc_read_key(key, buffer, 2);
 558         temp = buffer[0]*1000;
 559         temp += (buffer[1] >> 6) * 250;
 560
 561         mutex_unlock(&applesmc_lock);
 562
 563         if (ret)
 564                 return ret;
 565         else
 566                 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", temp);
 567 }
 568
 569 static ssize_t applesmc_show_fan_speed(struct device *dev,
 570                                 struct device_attribute *attr, char *sysfsbuf)
 571 {
 572         int ret;
 573         unsigned int speed = 0;
 574         char newkey[5];
 575         u8 buffer[2];
 576         struct sensor_device_attribute_2 *sensor_attr =
 577                                                 to_sensor_dev_attr_2(attr);
 578
 579         newkey[0] = fan_speed_keys[sensor_attr->nr][0];
 580         newkey[1] = '0' + sensor_attr->index;
 581         newkey[2] = fan_speed_keys[sensor_attr->nr][2];
 582         newkey[3] = fan_speed_keys[sensor_attr->nr][3];
 583         newkey[4] = 0;
 584
 585         mutex_lock(&applesmc_lock);
 586
 587         ret = applesmc_read_key(newkey, buffer, 2);
 588         speed = ((buffer[0] << 8 | buffer[1]) >> 2);
 589
 590         mutex_unlock(&applesmc_lock);
 591         if (ret)
 592                 return ret;
 593         else
 594                 return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
 595 }
 596
 597 static ssize_t applesmc_store_fan_speed(struct device *dev,
 598                                         struct device_attribute *attr,
 599                                         const char *sysfsbuf, size_t count)
 600 {
 601         int ret;
 602         u32 speed;
 603         char newkey[5];
 604         u8 buffer[2];
 605         struct sensor_device_attribute_2 *sensor_attr =
 606                                                 to_sensor_dev_attr_2(attr);
 607
 608         speed = simple_strtoul(sysfsbuf, NULL, 10);
 609
 610         if (speed > 0x4000) /* Bigger than a 14-bit value */
 611                 return -EINVAL;
 612
 613         newkey[0] = fan_speed_keys[sensor_attr->nr][0];
 614         newkey[1] = '0' + sensor_attr->index;
 615         newkey[2] = fan_speed_keys[sensor_attr->nr][2];
 616         newkey[3] = fan_speed_keys[sensor_attr->nr][3];
 617         newkey[4] = 0;
 618
 619         mutex_lock(&applesmc_lock);
 620
 621         buffer[0] = (speed >> 6) & 0xff;
 622         buffer[1] = (speed << 2) & 0xff;
 623         ret = applesmc_write_key(newkey, buffer, 2);
 624
 625         mutex_unlock(&applesmc_lock);
 626         if (ret)
 627                 return ret;
 628         else
 629                 return count;
 630 }
 631
 632 static ssize_t applesmc_show_fan_manual(struct device *dev,
 633                         struct device_attribute *devattr, char *sysfsbuf)
 634 {
 635         int ret;
 636         u16 manual = 0;
 637         u8 buffer[2];
 638         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 639
 640         mutex_lock(&applesmc_lock);
 641
 642         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 643         manual = ((buffer[0] << 8 | buffer[1]) >> attr->index) & 0x01;
 644
 645         mutex_unlock(&applesmc_lock);
 646         if (ret)
 647                 return ret;
 648         else
 649                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
 650 }
 651
 652 static ssize_t applesmc_store_fan_manual(struct device *dev,
 653                                          struct device_attribute *devattr,
 654                                          const char *sysfsbuf, size_t count)
 655 {
 656         int ret;
 657         u8 buffer[2];
 658         u32 input;
 659         u16 val;
 660         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 661
 662         input = simple_strtoul(sysfsbuf, NULL, 10);
 663
 664         mutex_lock(&applesmc_lock);
 665
 666         ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
 667         val = (buffer[0] << 8 | buffer[1]);
 668         if (ret)
 669                 goto out;
 670
 671         if (input)
 672                 val = val | (0x01 << attr->index);
 673         else
 674                 val = val & ~(0x01 << attr->index);
 675
 676         buffer[0] = (val >> 8) & 0xFF;
 677         buffer[1] = val & 0xFF;
 678
 679         ret = applesmc_write_key(FANS_MANUAL, buffer, 2);
 680
 681 out:
 682         mutex_unlock(&applesmc_lock);
 683         if (ret)
 684                 return ret;
 685         else
 686                 return count;
 687 }
 688
 689 static ssize_t applesmc_show_fan_position(struct device *dev,
 690                                 struct device_attribute *attr, char *sysfsbuf)
 691 {
 692         int ret;
 693         char newkey[5];
 694         u8 buffer[17];
 695         struct sensor_device_attribute_2 *sensor_attr =
 696                                                 to_sensor_dev_attr_2(attr);
 697
 698         newkey[0] = FAN_POSITION[0];
 699         newkey[1] = '0' + sensor_attr->index;
 700         newkey[2] = FAN_POSITION[2];
 701         newkey[3] = FAN_POSITION[3];
 702         newkey[4] = 0;
 703
 704         mutex_lock(&applesmc_lock);
 705
 706         ret = applesmc_read_key(newkey, buffer, 16);
 707         buffer[16] = 0;
 708
 709         mutex_unlock(&applesmc_lock);
 710         if (ret)
 711                 return ret;
 712         else
 713                 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
 714 }
 715
 716 static ssize_t applesmc_calibrate_show(struct device *dev,
 717                                 struct device_attribute *attr, char *sysfsbuf)
 718 {
 719         return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
 720 }
 721
 722 static ssize_t applesmc_calibrate_store(struct device *dev,
 723         struct device_attribute *attr, const char *sysfsbuf, size_t count)
 724 {
 725         mutex_lock(&applesmc_lock);
 726         applesmc_calibrate();
 727         mutex_unlock(&applesmc_lock);
 728
 729         return count;
 730 }
 731
 732 /* Store the next backlight value to be written by the work */
 733 static unsigned int backlight_value;
 734
 735 static void applesmc_backlight_set(struct work_struct *work)
 736 {
 737         u8 buffer[2];
 738
 739         mutex_lock(&applesmc_lock);
 740         buffer[0] = backlight_value;
 741         buffer[1] = 0x00;
 742         applesmc_write_key(BACKLIGHT_KEY, buffer, 2);
 743         mutex_unlock(&applesmc_lock);
 744 }
 745 static DECLARE_WORK(backlight_work, &applesmc_backlight_set);
 746
 747 static void applesmc_brightness_set(struct led_classdev *led_cdev,
 748                                                 enum led_brightness value)
 749 {
 750         int ret;
 751
 752         backlight_value = value;
 753         ret = queue_work(applesmc_led_wq, &backlight_work);
 754
 755         if (debug && (!ret))
 756                 printk(KERN_DEBUG "applesmc: work was already on the queue.\n");
 757 }
 758
 759 static ssize_t applesmc_key_count_show(struct device *dev,
 760                                 struct device_attribute *attr, char *sysfsbuf)
 761 {
 762         int ret;
 763         u8 buffer[4];
 764         u32 count;
 765
 766         mutex_lock(&applesmc_lock);
 767
 768         ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
 769         count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
 770                                                 ((u32)buffer[2]<<8) + buffer[3];
 771
 772         mutex_unlock(&applesmc_lock);
 773         if (ret)
 774                 return ret;
 775         else
 776                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
 777 }
 778
 779 static ssize_t applesmc_key_at_index_read_show(struct device *dev,
 780                                 struct device_attribute *attr, char *sysfsbuf)
 781 {
 782         char key[5];
 783         char info[6];
 784         int ret;
 785
 786         mutex_lock(&applesmc_lock);
 787
 788         ret = applesmc_get_key_at_index(key_at_index, key);
 789
 790         if (ret || !key[0]) {
 791                 mutex_unlock(&applesmc_lock);
 792
 793                 return -EINVAL;
 794         }
 795
 796         ret = applesmc_get_key_type(key, info);
 797
 798         if (ret) {
 799                 mutex_unlock(&applesmc_lock);
 800
 801                 return ret;
 802         }
 803
 804         /*
 805          * info[0] maximum value (APPLESMC_MAX_DATA_LENGTH) is much lower than
 806          * PAGE_SIZE, so we don't need any checks before writing to sysfsbuf.
 807          */
 808         ret = applesmc_read_key(key, sysfsbuf, info[0]);
 809
 810         mutex_unlock(&applesmc_lock);
 811
 812         if (!ret) {
 813                 return info[0];
 814         }
 815         else {
 816                 return ret;
 817         }
 818 }
 819
 820 static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
 821                                 struct device_attribute *attr, char *sysfsbuf)
 822 {
 823         char key[5];
 824         char info[6];
 825         int ret;
 826
 827         mutex_lock(&applesmc_lock);
 828
 829         ret = applesmc_get_key_at_index(key_at_index, key);
 830
 831         if (ret || !key[0]) {
 832                 mutex_unlock(&applesmc_lock);
 833
 834                 return -EINVAL;
 835         }
 836
 837         ret = applesmc_get_key_type(key, info);
 838
 839         mutex_unlock(&applesmc_lock);
 840
 841         if (!ret)
 842                 return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", info[0]);
 843         else
 844                 return ret;
 845 }
 846
 847 static ssize_t applesmc_key_at_index_type_show(struct device *dev,
 848                                 struct device_attribute *attr, char *sysfsbuf)
 849 {
 850         char key[5];
 851         char info[6];
 852         int ret;
 853
 854         mutex_lock(&applesmc_lock);
 855
 856         ret = applesmc_get_key_at_index(key_at_index, key);
 857
 858         if (ret || !key[0]) {
 859                 mutex_unlock(&applesmc_lock);
 860
 861                 return -EINVAL;
 862         }
 863
 864         ret = applesmc_get_key_type(key, info);
 865
 866         mutex_unlock(&applesmc_lock);
 867
 868         if (!ret)
 869                 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", info+1);
 870         else
 871                 return ret;
 872 }
 873
 874 static ssize_t applesmc_key_at_index_name_show(struct device *dev,
 875                                 struct device_attribute *attr, char *sysfsbuf)
 876 {
 877         char key[5];
 878         int ret;
 879
 880         mutex_lock(&applesmc_lock);
 881
 882         ret = applesmc_get_key_at_index(key_at_index, key);
 883
 884         mutex_unlock(&applesmc_lock);
 885
 886         if (!ret && key[0])
 887                 return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
 888         else
 889                 return -EINVAL;
 890 }
 891
 892 static ssize_t applesmc_key_at_index_show(struct device *dev,
 893                                 struct device_attribute *attr, char *sysfsbuf)
 894 {
 895         return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
 896 }
 897
 898 static ssize_t applesmc_key_at_index_store(struct device *dev,
 899         struct device_attribute *attr, const char *sysfsbuf, size_t count)
 900 {
 901         mutex_lock(&applesmc_lock);
 902
 903         key_at_index = simple_strtoul(sysfsbuf, NULL, 10);
 904
 905         mutex_unlock(&applesmc_lock);
 906
 907         return count;
 908 }
 909
 910 static struct led_classdev applesmc_backlight = {
 911         .name                   = "smc:kbd_backlight",
 912         .default_trigger        = "nand-disk",
 913         .brightness_set         = applesmc_brightness_set,
 914 };
 915
 916 static DEVICE_ATTR(position, 0444, applesmc_position_show, NULL);
 917 static DEVICE_ATTR(calibrate, 0644,
 918                         applesmc_calibrate_show, applesmc_calibrate_store);
 919
 920 static struct attribute *accelerometer_attributes[] = {
 921         &dev_attr_position.attr,
 922         &dev_attr_calibrate.attr,
 923         NULL
 924 };
 925
 926 static const struct attribute_group accelerometer_attributes_group =
 927         { .attrs = accelerometer_attributes };
 928
 929 static DEVICE_ATTR(light, 0444, applesmc_light_show, NULL);
 930
 931 static DEVICE_ATTR(key_count, 0444, applesmc_key_count_show, NULL);
 932 static DEVICE_ATTR(key_at_index, 0644,
 933                 applesmc_key_at_index_show, applesmc_key_at_index_store);
 934 static DEVICE_ATTR(key_at_index_name, 0444,
 935                                         applesmc_key_at_index_name_show, NULL);
 936 static DEVICE_ATTR(key_at_index_type, 0444,
 937                                         applesmc_key_at_index_type_show, NULL);
 938 static DEVICE_ATTR(key_at_index_data_length, 0444,
 939                                 applesmc_key_at_index_data_length_show, NULL);
 940 static DEVICE_ATTR(key_at_index_data, 0444,
 941                                 applesmc_key_at_index_read_show, NULL);
 942
 943 static struct attribute *key_enumeration_attributes[] = {
 944         &dev_attr_key_count.attr,
 945         &dev_attr_key_at_index.attr,
 946         &dev_attr_key_at_index_name.attr,
 947         &dev_attr_key_at_index_type.attr,
 948         &dev_attr_key_at_index_data_length.attr,
 949         &dev_attr_key_at_index_data.attr,
 950         NULL
 951 };
 952
 953 static const struct attribute_group key_enumeration_group =
 954         { .attrs = key_enumeration_attributes };
 955
 956 /*
 957  * Macro defining SENSOR_DEVICE_ATTR for a fan sysfs entries.
 958  *  - show actual speed
 959  *  - show/store minimum speed
 960  *  - show maximum speed
 961  *  - show safe speed
 962  *  - show/store target speed
 963  *  - show/store manual mode
 964  */
 965 #define sysfs_fan_speeds_offset(offset) \
 966 static SENSOR_DEVICE_ATTR_2(fan##offset##_input, S_IRUGO, \
 967                         applesmc_show_fan_speed, NULL, 0, offset-1); \
 968 \
 969 static SENSOR_DEVICE_ATTR_2(fan##offset##_min, S_IRUGO | S_IWUSR, \
 970         applesmc_show_fan_speed, applesmc_store_fan_speed, 1, offset-1); \
 971 \
 972 static SENSOR_DEVICE_ATTR_2(fan##offset##_max, S_IRUGO, \
 973                         applesmc_show_fan_speed, NULL, 2, offset-1); \
 974 \
 975 static SENSOR_DEVICE_ATTR_2(fan##offset##_safe, S_IRUGO, \
 976                         applesmc_show_fan_speed, NULL, 3, offset-1); \
 977 \
 978 static SENSOR_DEVICE_ATTR_2(fan##offset##_output, S_IRUGO | S_IWUSR, \
 979         applesmc_show_fan_speed, applesmc_store_fan_speed, 4, offset-1); \
 980 \
 981 static SENSOR_DEVICE_ATTR(fan##offset##_manual, S_IRUGO | S_IWUSR, \
 982         applesmc_show_fan_manual, applesmc_store_fan_manual, offset-1); \
 983 \
 984 static SENSOR_DEVICE_ATTR(fan##offset##_position, S_IRUGO, \
 985         applesmc_show_fan_position, NULL, offset-1); \
 986 \
 987 static struct attribute *fan##offset##_attributes[] = { \
 988         &sensor_dev_attr_fan##offset##_input.dev_attr.attr, \
 989         &sensor_dev_attr_fan##offset##_min.dev_attr.attr, \
 990         &sensor_dev_attr_fan##offset##_max.dev_attr.attr, \
 991         &sensor_dev_attr_fan##offset##_safe.dev_attr.attr, \
 992         &sensor_dev_attr_fan##offset##_output.dev_attr.attr, \
 993         &sensor_dev_attr_fan##offset##_manual.dev_attr.attr, \
 994         &sensor_dev_attr_fan##offset##_position.dev_attr.attr, \
 995         NULL \
 996 };
 997
 998 /*
 999  * Create the needed functions for each fan using the macro defined above
1000  * (2 fans are supported)
1001  */
1002 sysfs_fan_speeds_offset(1);
1003 sysfs_fan_speeds_offset(2);
1004
1005 static const struct attribute_group fan_attribute_groups[] = {
1006         { .attrs = fan1_attributes },
1007         { .attrs = fan2_attributes }
1008 };
1009
1010 /*
1011  * Temperature sensors sysfs entries.
1012  */
1013 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO,
1014                                         applesmc_show_temperature, NULL, 0);
1015 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO,
1016                                         applesmc_show_temperature, NULL, 1);
1017 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO,
1018                                         applesmc_show_temperature, NULL, 2);
1019 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO,
1020                                         applesmc_show_temperature, NULL, 3);
1021 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO,
1022                                         applesmc_show_temperature, NULL, 4);
1023 static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO,
1024                                         applesmc_show_temperature, NULL, 5);
1025 static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO,
1026                                         applesmc_show_temperature, NULL, 6);
1027 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO,
1028                                         applesmc_show_temperature, NULL, 7);
1029 static SENSOR_DEVICE_ATTR(temp9_input, S_IRUGO,
1030                                         applesmc_show_temperature, NULL, 8);
1031 static SENSOR_DEVICE_ATTR(temp10_input, S_IRUGO,
1032                                         applesmc_show_temperature, NULL, 9);
1033 static SENSOR_DEVICE_ATTR(temp11_input, S_IRUGO,
1034                                         applesmc_show_temperature, NULL, 10);
1035 static SENSOR_DEVICE_ATTR(temp12_input, S_IRUGO,
1036                                         applesmc_show_temperature, NULL, 11);
1037
1038 static struct attribute *temperature_attributes[] = {
1039         &sensor_dev_attr_temp1_input.dev_attr.attr,
1040         &sensor_dev_attr_temp2_input.dev_attr.attr,
1041         &sensor_dev_attr_temp3_input.dev_attr.attr,
1042         &sensor_dev_attr_temp4_input.dev_attr.attr,
1043         &sensor_dev_attr_temp5_input.dev_attr.attr,
1044         &sensor_dev_attr_temp6_input.dev_attr.attr,
1045         &sensor_dev_attr_temp7_input.dev_attr.attr,
1046         &sensor_dev_attr_temp8_input.dev_attr.attr,
1047         &sensor_dev_attr_temp9_input.dev_attr.attr,
1048         &sensor_dev_attr_temp10_input.dev_attr.attr,
1049         &sensor_dev_attr_temp11_input.dev_attr.attr,
1050         &sensor_dev_attr_temp12_input.dev_attr.attr,
1051         NULL
1052 };
1053
1054 static const struct attribute_group temperature_attributes_group =
1055         { .attrs = temperature_attributes };
1056
1057 /* Module stuff */
1058
1059 /*
1060  * applesmc_dmi_match - found a match.  return one, short-circuiting the hunt.
1061  */
1062 static int applesmc_dmi_match(struct dmi_system_id *id)
1063 {
1064         int i = 0;
1065         struct dmi_match_data* dmi_data = id->driver_data;
1066         printk(KERN_INFO "applesmc: %s detected:\n", id->ident);
1067         applesmc_accelerometer = dmi_data->accelerometer;
1068         printk(KERN_INFO "applesmc:  - Model %s accelerometer\n",
1069                                 applesmc_accelerometer ? "with" : "without");
1070         applesmc_light = dmi_data->light;
1071         printk(KERN_INFO "applesmc:  - Model %s light sensors and backlight\n",
1072                                         applesmc_light ? "with" : "without");
1073
1074         applesmc_temperature_set =  dmi_data->temperature_set;
1075         while (temperature_sensors_sets[applesmc_temperature_set][i] != NULL)
1076                 i++;
1077         printk(KERN_INFO "applesmc:  - Model with %d temperature sensors\n", i);
1078         return 1;
1079 }
1080
1081 /* Create accelerometer ressources */
1082 static int applesmc_create_accelerometer(void)
1083 {
1084         int ret;
1085
1086         ret = sysfs_create_group(&pdev->dev.kobj,
1087                                         &accelerometer_attributes_group);
1088         if (ret)
1089                 goto out;
1090
1091         applesmc_idev = input_allocate_device();
1092         if (!applesmc_idev) {
1093                 ret = -ENOMEM;
1094                 goto out_sysfs;
1095         }
1096
1097         /* initial calibrate for the input device */
1098         applesmc_calibrate();
1099
1100         /* initialize the input class */
1101         applesmc_idev->name = "applesmc";
1102         applesmc_idev->id.bustype = BUS_HOST;
1103         applesmc_idev->cdev.dev = &pdev->dev;
1104         applesmc_idev->evbit[0] = BIT(EV_ABS);
1105         applesmc_idev->open = applesmc_idev_open;
1106         applesmc_idev->close = applesmc_idev_close;
1107         input_set_abs_params(applesmc_idev, ABS_X,
1108                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1109         input_set_abs_params(applesmc_idev, ABS_Y,
1110                         -256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
1111
1112         ret = input_register_device(applesmc_idev);
1113         if (ret)
1114                 goto out_idev;
1115
1116         /* start up our timer for the input device */
1117         init_timer(&applesmc_timer);
1118         applesmc_timer.function = applesmc_idev_poll;
1119         applesmc_timer.expires = jiffies + APPLESMC_POLL_PERIOD;
1120
1121         return 0;
1122
1123 out_idev:
1124         input_free_device(applesmc_idev);
1125
1126 out_sysfs:
1127         sysfs_remove_group(&pdev->dev.kobj, &accelerometer_attributes_group);
1128
1129 out:
1130         printk(KERN_WARNING "applesmc: driver init failed (ret=%d)!\n", ret);
1131         return ret;
1132 }
1133
1134 /* Release all ressources used by the accelerometer */
1135 static void applesmc_release_accelerometer(void)
1136 {
1137         del_timer_sync(&applesmc_timer);
1138         input_unregister_device(applesmc_idev);
1139         sysfs_remove_group(&pdev->dev.kobj, &accelerometer_attributes_group);
1140 }
1141
1142 static __initdata struct dmi_match_data applesmc_dmi_data[] = {
1143 /* MacBook Pro: accelerometer, backlight and temperature set 0 */
1144         { .accelerometer = 1, .light = 1, .temperature_set = 0 },
1145 /* MacBook: accelerometer and temperature set 0 */
1146         { .accelerometer = 1, .light = 0, .temperature_set = 0 },
1147 /* MacBook: temperature set 1 */
1148         { .accelerometer = 0, .light = 0, .temperature_set = 1 }
1149 };
1150
1151 /* Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
1152  * So we need to put "Apple MacBook Pro" before "Apple MacBook". */
1153 static __initdata struct dmi_system_id applesmc_whitelist[] = {
1154         { applesmc_dmi_match, "Apple MacBook Pro", {
1155           DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
1156           DMI_MATCH(DMI_PRODUCT_NAME,"MacBookPro") },
1157                 (void*)&applesmc_dmi_data[0]},
1158         { applesmc_dmi_match, "Apple MacBook", {
1159           DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
1160           DMI_MATCH(DMI_PRODUCT_NAME,"MacBook") },
1161                 (void*)&applesmc_dmi_data[1]},
1162         { applesmc_dmi_match, "Apple Macmini", {
1163           DMI_MATCH(DMI_BOARD_VENDOR,"Apple"),
1164           DMI_MATCH(DMI_PRODUCT_NAME,"Macmini") },
1165                 (void*)&applesmc_dmi_data[2]},
1166         { .ident = NULL }
1167 };
1168
1169 static int __init applesmc_init(void)
1170 {
1171         int ret;
1172         int count;
1173         int i;
1174
1175         mutex_init(&applesmc_lock);
1176
1177         if (!dmi_check_system(applesmc_whitelist)) {
1178                 printk(KERN_WARNING "applesmc: supported laptop not found!\n");
1179                 ret = -ENODEV;
1180                 goto out;
1181         }
1182
1183         if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
1184                                                                 "applesmc")) {
1185                 ret = -ENXIO;
1186                 goto out;
1187         }
1188
1189         ret = platform_driver_register(&applesmc_driver);
1190         if (ret)
1191                 goto out_region;
1192
1193         pdev = platform_device_register_simple("applesmc", -1, NULL, 0);
1194         if (IS_ERR(pdev)) {
1195                 ret = PTR_ERR(pdev);
1196                 goto out_driver;
1197         }
1198
1199         /* Create key enumeration sysfs files */
1200         ret = sysfs_create_group(&pdev->dev.kobj, &key_enumeration_group);
1201         if (ret)
1202                 goto out_device;
1203
1204         /* create fan files */
1205         count = applesmc_get_fan_count();
1206         if (count < 0) {
1207                 printk(KERN_ERR "applesmc: Cannot get the number of fans.\n");
1208         } else {
1209                 printk(KERN_INFO "applesmc: %d fans found.\n", count);
1210
1211                 switch (count) {
1212                 default:
1213                         printk(KERN_WARNING "applesmc: More than 2 fans found,"
1214                                         " but at most 2 fans are supported"
1215                                                 " by the driver.\n");
1216                 case 2:
1217                         ret = sysfs_create_group(&pdev->dev.kobj,
1218                                                  &fan_attribute_groups[1]);
1219                         if (ret)
1220                                 goto out_key_enumeration;
1221                 case 1:
1222                         ret = sysfs_create_group(&pdev->dev.kobj,
1223                                                  &fan_attribute_groups[0]);
1224                         if (ret)
1225                                 goto out_fan_1;
1226                 case 0:
1227                         ;
1228                 }
1229         }
1230
1231         for (i = 0;
1232              temperature_sensors_sets[applesmc_temperature_set][i] != NULL;
1233              i++) {
1234                 if (temperature_attributes[i] == NULL) {
1235                         printk(KERN_ERR "applesmc: More temperature sensors "
1236                                 "in temperature_sensors_sets (at least %i)"
1237                                 "than available sysfs files in "
1238                                 "temperature_attributes (%i), please report "
1239                                 "this bug.\n", i, i-1);
1240                         goto out_temperature;
1241                 }
1242                 ret = sysfs_create_file(&pdev->dev.kobj,
1243                                                 temperature_attributes[i]);
1244                 if (ret)
1245                         goto out_temperature;
1246         }
1247
1248         if (applesmc_accelerometer) {
1249                 ret = applesmc_create_accelerometer();
1250                 if (ret)
1251                         goto out_temperature;
1252         }
1253
1254         if (applesmc_light) {
1255                 /* Add light sensor file */
1256                 ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_light.attr);
1257                 if (ret)
1258                         goto out_accelerometer;
1259
1260                 /* Create the workqueue */
1261                 applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
1262                 if (!applesmc_led_wq) {
1263                         ret = -ENOMEM;
1264                         goto out_light_sysfs;
1265                 }
1266
1267                 /* register as a led device */
1268                 ret = led_classdev_register(&pdev->dev, &applesmc_backlight);
1269                 if (ret < 0)
1270                         goto out_light_wq;
1271         }
1272
1273         hwmon_class_dev = hwmon_device_register(&pdev->dev);
1274         if (IS_ERR(hwmon_class_dev)) {
1275                 ret = PTR_ERR(hwmon_class_dev);
1276                 goto out_light_ledclass;
1277         }
1278
1279         printk(KERN_INFO "applesmc: driver successfully loaded.\n");
1280
1281         return 0;
1282
1283 out_light_ledclass:
1284         if (applesmc_light)
1285                 led_classdev_unregister(&applesmc_backlight);
1286 out_light_wq:
1287         if (applesmc_light)
1288                 destroy_workqueue(applesmc_led_wq);
1289 out_light_sysfs:
1290         if (applesmc_light)
1291                 sysfs_remove_file(&pdev->dev.kobj, &dev_attr_light.attr);
1292 out_accelerometer:
1293         if (applesmc_accelerometer)
1294                 applesmc_release_accelerometer();
1295 out_temperature:
1296         sysfs_remove_group(&pdev->dev.kobj, &temperature_attributes_group);
1297         sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[0]);
1298 out_fan_1:
1299         sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[1]);
1300 out_key_enumeration:
1301         sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
1302 out_device:
1303         platform_device_unregister(pdev);
1304 out_driver:
1305         platform_driver_unregister(&applesmc_driver);
1306 out_region:
1307         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1308 out:
1309         printk(KERN_WARNING "applesmc: driver init failed (ret=%d)!\n", ret);
1310         return ret;
1311 }
1312
1313 static void __exit applesmc_exit(void)
1314 {
1315         hwmon_device_unregister(hwmon_class_dev);
1316         if (applesmc_light) {
1317                 led_classdev_unregister(&applesmc_backlight);
1318                 destroy_workqueue(applesmc_led_wq);
1319                 sysfs_remove_file(&pdev->dev.kobj, &dev_attr_light.attr);
1320         }
1321         if (applesmc_accelerometer)
1322                 applesmc_release_accelerometer();
1323         sysfs_remove_group(&pdev->dev.kobj, &temperature_attributes_group);
1324         sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[0]);
1325         sysfs_remove_group(&pdev->dev.kobj, &fan_attribute_groups[1]);
1326         sysfs_remove_group(&pdev->dev.kobj, &key_enumeration_group);
1327         platform_device_unregister(pdev);
1328         platform_driver_unregister(&applesmc_driver);
1329         release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
1330
1331         printk(KERN_INFO "applesmc: driver unloaded.\n");
1332 }
1333
1334 module_init(applesmc_init);
1335 module_exit(applesmc_exit);
1336
1337 MODULE_AUTHOR("Nicolas Boichat");
1338 MODULE_DESCRIPTION("Apple SMC");
1339 MODULE_LICENSE("GPL v2");