applesmc.c 32.5 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383
/*
 * drivers/hwmon/applesmc.c - driver for Apple's SMC (accelerometer, temperature
 * sensors, fan control, keyboard backlight control) used in Intel-based Apple
 * computers.
 *
 * Copyright (C) 2007 Nicolas Boichat <nicolas@boichat.ch>
 * Copyright (C) 2010 Henrik Rydberg <rydberg@euromail.se>
 *
 * Based on hdaps.c driver:
 * Copyright (C) 2005 Robert Love <rml@novell.com>
 * Copyright (C) 2005 Jesper Juhl <jj@chaosbits.net>
 *
 * Fan control based on smcFanControl:
 * Copyright (C) 2006 Hendrik Holtmann <holtmann@mac.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License v2 as published by the
 * Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/input-polldev.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/timer.h>
#include <linux/dmi.h>
#include <linux/mutex.h>
#include <linux/hwmon-sysfs.h>
#include <linux/io.h>
#include <linux/leds.h>
#include <linux/hwmon.h>
#include <linux/workqueue.h>
#include <linux/err.h>

/* data port used by Apple SMC */
#define APPLESMC_DATA_PORT	0x300
/* command/status port used by Apple SMC */
#define APPLESMC_CMD_PORT	0x304

#define APPLESMC_NR_PORTS	32 /* 0x300-0x31f */

#define APPLESMC_MAX_DATA_LENGTH 32

/* wait up to 128 ms for a status change. */
#define APPLESMC_MIN_WAIT	0x0010
#define APPLESMC_RETRY_WAIT	0x0100
#define APPLESMC_MAX_WAIT	0x20000

#define APPLESMC_READ_CMD	0x10
#define APPLESMC_WRITE_CMD	0x11
#define APPLESMC_GET_KEY_BY_INDEX_CMD	0x12
#define APPLESMC_GET_KEY_TYPE_CMD	0x13

#define KEY_COUNT_KEY		"#KEY" /* r-o ui32 */

#define LIGHT_SENSOR_LEFT_KEY	"ALV0" /* r-o {alv (6-10 bytes) */
#define LIGHT_SENSOR_RIGHT_KEY	"ALV1" /* r-o {alv (6-10 bytes) */
#define BACKLIGHT_KEY		"LKSB" /* w-o {lkb (2 bytes) */

#define CLAMSHELL_KEY		"MSLD" /* r-o ui8 (unused) */

#define MOTION_SENSOR_X_KEY	"MO_X" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_Y_KEY	"MO_Y" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_Z_KEY	"MO_Z" /* r-o sp78 (2 bytes) */
#define MOTION_SENSOR_KEY	"MOCN" /* r/w ui16 */

#define FANS_COUNT		"FNum" /* r-o ui8 */
#define FANS_MANUAL		"FS! " /* r-w ui16 */
#define FAN_ID_FMT		"F%dID" /* r-o char[16] */

#define TEMP_SENSOR_TYPE	"sp78"

/* List of keys used to read/write fan speeds */
static const char *const fan_speed_fmt[] = {
	"F%dAc",		/* actual speed */
	"F%dMn",		/* minimum speed (rw) */
	"F%dMx",		/* maximum speed */
	"F%dSf",		/* safe speed - not all models */
	"F%dTg",		/* target speed (manual: rw) */
};

#define INIT_TIMEOUT_MSECS	5000	/* wait up to 5s for device init ... */
#define INIT_WAIT_MSECS		50	/* ... in 50ms increments */

#define APPLESMC_POLL_INTERVAL	50	/* msecs */
#define APPLESMC_INPUT_FUZZ	4	/* input event threshold */
#define APPLESMC_INPUT_FLAT	4

#define to_index(attr) (to_sensor_dev_attr(attr)->index & 0xffff)
#define to_option(attr) (to_sensor_dev_attr(attr)->index >> 16)

/* Dynamic device node attributes */
struct applesmc_dev_attr {
	struct sensor_device_attribute sda;	/* hwmon attributes */
	char name[32];				/* room for node file name */
};

/* Dynamic device node group */
struct applesmc_node_group {
	char *format;				/* format string */
	void *show;				/* show function */
	void *store;				/* store function */
	int option;				/* function argument */
	struct applesmc_dev_attr *nodes;	/* dynamic node array */
};

/* AppleSMC entry - cached register information */
struct applesmc_entry {
	char key[5];		/* four-letter key code */
	u8 valid;		/* set when entry is successfully read once */
	u8 len;			/* bounded by APPLESMC_MAX_DATA_LENGTH */
	char type[5];		/* four-letter type code */
	u8 flags;		/* 0x10: func; 0x40: write; 0x80: read */
};

/* Register lookup and registers common to all SMCs */
static struct applesmc_registers {
	struct mutex mutex;		/* register read/write mutex */
	unsigned int key_count;		/* number of SMC registers */
	unsigned int fan_count;		/* number of fans */
	unsigned int temp_count;	/* number of temperature registers */
	unsigned int temp_begin;	/* temperature lower index bound */
	unsigned int temp_end;		/* temperature upper index bound */
	unsigned int index_count;	/* size of temperature index array */
	int num_light_sensors;		/* number of light sensors */
	bool has_accelerometer;		/* has motion sensor */
	bool has_key_backlight;		/* has keyboard backlight */
	bool init_complete;		/* true when fully initialized */
	struct applesmc_entry *cache;	/* cached key entries */
	const char **index;		/* temperature key index */
} smcreg = {
	.mutex = __MUTEX_INITIALIZER(smcreg.mutex),
};

static const int debug;
static struct platform_device *pdev;
static s16 rest_x;
static s16 rest_y;
static u8 backlight_state[2];

static struct device *hwmon_dev;
static struct input_polled_dev *applesmc_idev;

/*
 * Last index written to key_at_index sysfs file, and value to use for all other
 * key_at_index_* sysfs files.
 */
static unsigned int key_at_index;

static struct workqueue_struct *applesmc_led_wq;

/*
 * wait_read - Wait for a byte to appear on SMC port. Callers must
 * hold applesmc_lock.
 */
static int wait_read(void)
{
	u8 status;
	int us;
	for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
		udelay(us);
		status = inb(APPLESMC_CMD_PORT);
		/* read: wait for smc to settle */
		if (status & 0x01)
			return 0;
	}

	pr_warn("wait_read() fail: 0x%02x\n", status);
	return -EIO;
}

/*
 * send_byte - Write to SMC port, retrying when necessary. Callers
 * must hold applesmc_lock.
 */
static int send_byte(u8 cmd, u16 port)
{
	u8 status;
	int us;

	outb(cmd, port);
	for (us = APPLESMC_MIN_WAIT; us < APPLESMC_MAX_WAIT; us <<= 1) {
		udelay(us);
		status = inb(APPLESMC_CMD_PORT);
		/* write: wait for smc to settle */
		if (status & 0x02)
			continue;
		/* ready: cmd accepted, return */
		if (status & 0x04)
			return 0;
		/* timeout: give up */
		if (us << 1 == APPLESMC_MAX_WAIT)
			break;
		/* busy: long wait and resend */
		udelay(APPLESMC_RETRY_WAIT);
		outb(cmd, port);
	}

	pr_warn("send_byte(0x%02x, 0x%04x) fail: 0x%02x\n", cmd, port, status);
	return -EIO;
}

static int send_command(u8 cmd)
{
	return send_byte(cmd, APPLESMC_CMD_PORT);
}

static int send_argument(const char *key)
{
	int i;

	for (i = 0; i < 4; i++)
		if (send_byte(key[i], APPLESMC_DATA_PORT))
			return -EIO;
	return 0;
}

static int read_smc(u8 cmd, const char *key, u8 *buffer, u8 len)
{
	u8 status, data = 0;
	int i;

	if (send_command(cmd) || send_argument(key)) {
		pr_warn("%.4s: read arg fail\n", key);
		return -EIO;
	}

	/* This has no effect on newer (2012) SMCs */
	if (send_byte(len, APPLESMC_DATA_PORT)) {
		pr_warn("%.4s: read len fail\n", key);
		return -EIO;
	}

	for (i = 0; i < len; i++) {
		if (wait_read()) {
			pr_warn("%.4s: read data[%d] fail\n", key, i);
			return -EIO;
		}
		buffer[i] = inb(APPLESMC_DATA_PORT);
	}

	/* Read the data port until bit0 is cleared */
	for (i = 0; i < 16; i++) {
		udelay(APPLESMC_MIN_WAIT);
		status = inb(APPLESMC_CMD_PORT);
		if (!(status & 0x01))
			break;
		data = inb(APPLESMC_DATA_PORT);
	}
	if (i)
		pr_warn("flushed %d bytes, last value is: %d\n", i, data);

	return 0;
}

static int write_smc(u8 cmd, const char *key, const u8 *buffer, u8 len)
{
	int i;

	if (send_command(cmd) || send_argument(key)) {
		pr_warn("%s: write arg fail\n", key);
		return -EIO;
	}

	if (send_byte(len, APPLESMC_DATA_PORT)) {
		pr_warn("%.4s: write len fail\n", key);
		return -EIO;
	}

	for (i = 0; i < len; i++) {
		if (send_byte(buffer[i], APPLESMC_DATA_PORT)) {
			pr_warn("%s: write data fail\n", key);
			return -EIO;
		}
	}

	return 0;
}

static int read_register_count(unsigned int *count)
{
	__be32 be;
	int ret;

	ret = read_smc(APPLESMC_READ_CMD, KEY_COUNT_KEY, (u8 *)&be, 4);
	if (ret)
		return ret;

	*count = be32_to_cpu(be);
	return 0;
}

/*
 * Serialized I/O
 *
 * Returns zero on success or a negative error on failure.
 * All functions below are concurrency safe - callers should NOT hold lock.
 */

static int applesmc_read_entry(const struct applesmc_entry *entry,
			       u8 *buf, u8 len)
{
	int ret;

	if (entry->len != len)
		return -EINVAL;
	mutex_lock(&smcreg.mutex);
	ret = read_smc(APPLESMC_READ_CMD, entry->key, buf, len);
	mutex_unlock(&smcreg.mutex);

	return ret;
}

static int applesmc_write_entry(const struct applesmc_entry *entry,
				const u8 *buf, u8 len)
{
	int ret;

	if (entry->len != len)
		return -EINVAL;
	mutex_lock(&smcreg.mutex);
	ret = write_smc(APPLESMC_WRITE_CMD, entry->key, buf, len);
	mutex_unlock(&smcreg.mutex);
	return ret;
}

static const struct applesmc_entry *applesmc_get_entry_by_index(int index)
{
	struct applesmc_entry *cache = &smcreg.cache[index];
	u8 key[4], info[6];
	__be32 be;
	int ret = 0;

	if (cache->valid)
		return cache;

	mutex_lock(&smcreg.mutex);

	if (cache->valid)
		goto out;
	be = cpu_to_be32(index);
	ret = read_smc(APPLESMC_GET_KEY_BY_INDEX_CMD, (u8 *)&be, key, 4);
	if (ret)
		goto out;
	ret = read_smc(APPLESMC_GET_KEY_TYPE_CMD, key, info, 6);
	if (ret)
		goto out;

	memcpy(cache->key, key, 4);
	cache->len = info[0];
	memcpy(cache->type, &info[1], 4);
	cache->flags = info[5];
	cache->valid = 1;

out:
	mutex_unlock(&smcreg.mutex);
	if (ret)
		return ERR_PTR(ret);
	return cache;
}

static int applesmc_get_lower_bound(unsigned int *lo, const char *key)
{
	int begin = 0, end = smcreg.key_count;
	const struct applesmc_entry *entry;

	while (begin != end) {
		int middle = begin + (end - begin) / 2;
		entry = applesmc_get_entry_by_index(middle);
		if (IS_ERR(entry)) {
			*lo = 0;
			return PTR_ERR(entry);
		}
		if (strcmp(entry->key, key) < 0)
			begin = middle + 1;
		else
			end = middle;
	}

	*lo = begin;
	return 0;
}

static int applesmc_get_upper_bound(unsigned int *hi, const char *key)
{
	int begin = 0, end = smcreg.key_count;
	const struct applesmc_entry *entry;

	while (begin != end) {
		int middle = begin + (end - begin) / 2;
		entry = applesmc_get_entry_by_index(middle);
		if (IS_ERR(entry)) {
			*hi = smcreg.key_count;
			return PTR_ERR(entry);
		}
		if (strcmp(key, entry->key) < 0)
			end = middle;
		else
			begin = middle + 1;
	}

	*hi = begin;
	return 0;
}

static const struct applesmc_entry *applesmc_get_entry_by_key(const char *key)
{
	int begin, end;
	int ret;

	ret = applesmc_get_lower_bound(&begin, key);
	if (ret)
		return ERR_PTR(ret);
	ret = applesmc_get_upper_bound(&end, key);
	if (ret)
		return ERR_PTR(ret);
	if (end - begin != 1)
		return ERR_PTR(-EINVAL);

	return applesmc_get_entry_by_index(begin);
}

static int applesmc_read_key(const char *key, u8 *buffer, u8 len)
{
	const struct applesmc_entry *entry;

	entry = applesmc_get_entry_by_key(key);
	if (IS_ERR(entry))
		return PTR_ERR(entry);

	return applesmc_read_entry(entry, buffer, len);
}

static int applesmc_write_key(const char *key, const u8 *buffer, u8 len)
{
	const struct applesmc_entry *entry;

	entry = applesmc_get_entry_by_key(key);
	if (IS_ERR(entry))
		return PTR_ERR(entry);

	return applesmc_write_entry(entry, buffer, len);
}

static int applesmc_has_key(const char *key, bool *value)
{
	const struct applesmc_entry *entry;

	entry = applesmc_get_entry_by_key(key);
	if (IS_ERR(entry) && PTR_ERR(entry) != -EINVAL)
		return PTR_ERR(entry);

	*value = !IS_ERR(entry);
	return 0;
}

/*
 * applesmc_read_s16 - Read 16-bit signed big endian register
 */
static int applesmc_read_s16(const char *key, s16 *value)
{
	u8 buffer[2];
	int ret;

	ret = applesmc_read_key(key, buffer, 2);
	if (ret)
		return ret;

	*value = ((s16)buffer[0] << 8) | buffer[1];
	return 0;
}

/*
 * applesmc_device_init - initialize the accelerometer.  Can sleep.
 */
static void applesmc_device_init(void)
{
	int total;
	u8 buffer[2];

	if (!smcreg.has_accelerometer)
		return;

	for (total = INIT_TIMEOUT_MSECS; total > 0; total -= INIT_WAIT_MSECS) {
		if (!applesmc_read_key(MOTION_SENSOR_KEY, buffer, 2) &&
				(buffer[0] != 0x00 || buffer[1] != 0x00))
			return;
		buffer[0] = 0xe0;
		buffer[1] = 0x00;
		applesmc_write_key(MOTION_SENSOR_KEY, buffer, 2);
		msleep(INIT_WAIT_MSECS);
	}

	pr_warn("failed to init the device\n");
}

static int applesmc_init_index(struct applesmc_registers *s)
{
	const struct applesmc_entry *entry;
	unsigned int i;

	if (s->index)
		return 0;

	s->index = kcalloc(s->temp_count, sizeof(s->index[0]), GFP_KERNEL);
	if (!s->index)
		return -ENOMEM;

	for (i = s->temp_begin; i < s->temp_end; i++) {
		entry = applesmc_get_entry_by_index(i);
		if (IS_ERR(entry))
			continue;
		if (strcmp(entry->type, TEMP_SENSOR_TYPE))
			continue;
		s->index[s->index_count++] = entry->key;
	}

	return 0;
}

/*
 * applesmc_init_smcreg_try - Try to initialize register cache. Idempotent.
 */
static int applesmc_init_smcreg_try(void)
{
	struct applesmc_registers *s = &smcreg;
	bool left_light_sensor = 0, right_light_sensor = 0;
	unsigned int count;
	u8 tmp[1];
	int ret;

	if (s->init_complete)
		return 0;

	ret = read_register_count(&count);
	if (ret)
		return ret;

	if (s->cache && s->key_count != count) {
		pr_warn("key count changed from %d to %d\n",
			s->key_count, count);
		kfree(s->cache);
		s->cache = NULL;
	}
	s->key_count = count;

	if (!s->cache)
		s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL);
	if (!s->cache)
		return -ENOMEM;

	ret = applesmc_read_key(FANS_COUNT, tmp, 1);
	if (ret)
		return ret;
	s->fan_count = tmp[0];

	ret = applesmc_get_lower_bound(&s->temp_begin, "T");
	if (ret)
		return ret;
	ret = applesmc_get_lower_bound(&s->temp_end, "U");
	if (ret)
		return ret;
	s->temp_count = s->temp_end - s->temp_begin;

	ret = applesmc_init_index(s);
	if (ret)
		return ret;

	ret = applesmc_has_key(LIGHT_SENSOR_LEFT_KEY, &left_light_sensor);
	if (ret)
		return ret;
	ret = applesmc_has_key(LIGHT_SENSOR_RIGHT_KEY, &right_light_sensor);
	if (ret)
		return ret;
	ret = applesmc_has_key(MOTION_SENSOR_KEY, &s->has_accelerometer);
	if (ret)
		return ret;
	ret = applesmc_has_key(BACKLIGHT_KEY, &s->has_key_backlight);
	if (ret)
		return ret;

	s->num_light_sensors = left_light_sensor + right_light_sensor;
	s->init_complete = true;

	pr_info("key=%d fan=%d temp=%d index=%d acc=%d lux=%d kbd=%d\n",
	       s->key_count, s->fan_count, s->temp_count, s->index_count,
	       s->has_accelerometer,
	       s->num_light_sensors,
	       s->has_key_backlight);

	return 0;
}

static void applesmc_destroy_smcreg(void)
{
	kfree(smcreg.index);
	smcreg.index = NULL;
	kfree(smcreg.cache);
	smcreg.cache = NULL;
	smcreg.init_complete = false;
}

/*
 * applesmc_init_smcreg - Initialize register cache.
 *
 * Retries until initialization is successful, or the operation times out.
 *
 */
static int applesmc_init_smcreg(void)
{
	int ms, ret;

	for (ms = 0; ms < INIT_TIMEOUT_MSECS; ms += INIT_WAIT_MSECS) {
		ret = applesmc_init_smcreg_try();
		if (!ret) {
			if (ms)
				pr_info("init_smcreg() took %d ms\n", ms);
			return 0;
		}
		msleep(INIT_WAIT_MSECS);
	}

	applesmc_destroy_smcreg();

	return ret;
}

/* Device model stuff */
static int applesmc_probe(struct platform_device *dev)
{
	int ret;

	ret = applesmc_init_smcreg();
	if (ret)
		return ret;

	applesmc_device_init();

	return 0;
}

/* Synchronize device with memorized backlight state */
static int applesmc_pm_resume(struct device *dev)
{
	if (smcreg.has_key_backlight)
		applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
	return 0;
}

/* Reinitialize device on resume from hibernation */
static int applesmc_pm_restore(struct device *dev)
{
	applesmc_device_init();
	return applesmc_pm_resume(dev);
}

static const struct dev_pm_ops applesmc_pm_ops = {
	.resume = applesmc_pm_resume,
	.restore = applesmc_pm_restore,
};

static struct platform_driver applesmc_driver = {
	.probe = applesmc_probe,
	.driver	= {
		.name = "applesmc",
		.pm = &applesmc_pm_ops,
	},
};

/*
 * applesmc_calibrate - Set our "resting" values.  Callers must
 * hold applesmc_lock.
 */
static void applesmc_calibrate(void)
{
	applesmc_read_s16(MOTION_SENSOR_X_KEY, &rest_x);
	applesmc_read_s16(MOTION_SENSOR_Y_KEY, &rest_y);
	rest_x = -rest_x;
}

static void applesmc_idev_poll(struct input_polled_dev *dev)
{
	struct input_dev *idev = dev->input;
	s16 x, y;

	if (applesmc_read_s16(MOTION_SENSOR_X_KEY, &x))
		return;
	if (applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y))
		return;

	x = -x;
	input_report_abs(idev, ABS_X, x - rest_x);
	input_report_abs(idev, ABS_Y, y - rest_y);
	input_sync(idev);
}

/* Sysfs Files */

static ssize_t applesmc_name_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "applesmc\n");
}

static ssize_t applesmc_position_show(struct device *dev,
				   struct device_attribute *attr, char *buf)
{
	int ret;
	s16 x, y, z;

	ret = applesmc_read_s16(MOTION_SENSOR_X_KEY, &x);
	if (ret)
		goto out;
	ret = applesmc_read_s16(MOTION_SENSOR_Y_KEY, &y);
	if (ret)
		goto out;
	ret = applesmc_read_s16(MOTION_SENSOR_Z_KEY, &z);
	if (ret)
		goto out;

out:
	if (ret)
		return ret;
	else
		return snprintf(buf, PAGE_SIZE, "(%d,%d,%d)\n", x, y, z);
}

static ssize_t applesmc_light_show(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	const struct applesmc_entry *entry;
	static int data_length;
	int ret;
	u8 left = 0, right = 0;
	u8 buffer[10];

	if (!data_length) {
		entry = applesmc_get_entry_by_key(LIGHT_SENSOR_LEFT_KEY);
		if (IS_ERR(entry))
			return PTR_ERR(entry);
		if (entry->len > 10)
			return -ENXIO;
		data_length = entry->len;
		pr_info("light sensor data length set to %d\n", data_length);
	}

	ret = applesmc_read_key(LIGHT_SENSOR_LEFT_KEY, buffer, data_length);
	/* newer macbooks report a single 10-bit bigendian value */
	if (data_length == 10) {
		left = be16_to_cpu(*(__be16 *)(buffer + 6)) >> 2;
		goto out;
	}
	left = buffer[2];
	if (ret)
		goto out;
	ret = applesmc_read_key(LIGHT_SENSOR_RIGHT_KEY, buffer, data_length);
	right = buffer[2];

out:
	if (ret)
		return ret;
	else
		return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", left, right);
}

/* Displays sensor key as label */
static ssize_t applesmc_show_sensor_label(struct device *dev,
			struct device_attribute *devattr, char *sysfsbuf)
{
	const char *key = smcreg.index[to_index(devattr)];

	return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", key);
}

/* Displays degree Celsius * 1000 */
static ssize_t applesmc_show_temperature(struct device *dev,
			struct device_attribute *devattr, char *sysfsbuf)
{
	const char *key = smcreg.index[to_index(devattr)];
	int ret;
	s16 value;
	int temp;

	ret = applesmc_read_s16(key, &value);
	if (ret)
		return ret;

	temp = 250 * (value >> 6);

	return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", temp);
}

static ssize_t applesmc_show_fan_speed(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	int ret;
	unsigned int speed = 0;
	char newkey[5];
	u8 buffer[2];

	sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));

	ret = applesmc_read_key(newkey, buffer, 2);
	speed = ((buffer[0] << 8 | buffer[1]) >> 2);

	if (ret)
		return ret;
	else
		return snprintf(sysfsbuf, PAGE_SIZE, "%u\n", speed);
}

static ssize_t applesmc_store_fan_speed(struct device *dev,
					struct device_attribute *attr,
					const char *sysfsbuf, size_t count)
{
	int ret;
	unsigned long speed;
	char newkey[5];
	u8 buffer[2];

	if (kstrtoul(sysfsbuf, 10, &speed) < 0 || speed >= 0x4000)
		return -EINVAL;		/* Bigger than a 14-bit value */

	sprintf(newkey, fan_speed_fmt[to_option(attr)], to_index(attr));

	buffer[0] = (speed >> 6) & 0xff;
	buffer[1] = (speed << 2) & 0xff;
	ret = applesmc_write_key(newkey, buffer, 2);

	if (ret)
		return ret;
	else
		return count;
}

static ssize_t applesmc_show_fan_manual(struct device *dev,
			struct device_attribute *attr, char *sysfsbuf)
{
	int ret;
	u16 manual = 0;
	u8 buffer[2];

	ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
	manual = ((buffer[0] << 8 | buffer[1]) >> to_index(attr)) & 0x01;

	if (ret)
		return ret;
	else
		return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", manual);
}

static ssize_t applesmc_store_fan_manual(struct device *dev,
					 struct device_attribute *attr,
					 const char *sysfsbuf, size_t count)
{
	int ret;
	u8 buffer[2];
	unsigned long input;
	u16 val;

	if (kstrtoul(sysfsbuf, 10, &input) < 0)
		return -EINVAL;

	ret = applesmc_read_key(FANS_MANUAL, buffer, 2);
	val = (buffer[0] << 8 | buffer[1]);
	if (ret)
		goto out;

	if (input)
		val = val | (0x01 << to_index(attr));
	else
		val = val & ~(0x01 << to_index(attr));

	buffer[0] = (val >> 8) & 0xFF;
	buffer[1] = val & 0xFF;

	ret = applesmc_write_key(FANS_MANUAL, buffer, 2);

out:
	if (ret)
		return ret;
	else
		return count;
}

static ssize_t applesmc_show_fan_position(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	int ret;
	char newkey[5];
	u8 buffer[17];

	sprintf(newkey, FAN_ID_FMT, to_index(attr));

	ret = applesmc_read_key(newkey, buffer, 16);
	buffer[16] = 0;

	if (ret)
		return ret;
	else
		return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", buffer+4);
}

static ssize_t applesmc_calibrate_show(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	return snprintf(sysfsbuf, PAGE_SIZE, "(%d,%d)\n", rest_x, rest_y);
}

static ssize_t applesmc_calibrate_store(struct device *dev,
	struct device_attribute *attr, const char *sysfsbuf, size_t count)
{
	applesmc_calibrate();

	return count;
}

static void applesmc_backlight_set(struct work_struct *work)
{
	applesmc_write_key(BACKLIGHT_KEY, backlight_state, 2);
}
static DECLARE_WORK(backlight_work, &applesmc_backlight_set);

static void applesmc_brightness_set(struct led_classdev *led_cdev,
						enum led_brightness value)
{
	int ret;

	backlight_state[0] = value;
	ret = queue_work(applesmc_led_wq, &backlight_work);

	if (debug && (!ret))
		dev_dbg(led_cdev->dev, "work was already on the queue.\n");
}

static ssize_t applesmc_key_count_show(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	int ret;
	u8 buffer[4];
	u32 count;

	ret = applesmc_read_key(KEY_COUNT_KEY, buffer, 4);
	count = ((u32)buffer[0]<<24) + ((u32)buffer[1]<<16) +
						((u32)buffer[2]<<8) + buffer[3];

	if (ret)
		return ret;
	else
		return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", count);
}

static ssize_t applesmc_key_at_index_read_show(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	const struct applesmc_entry *entry;
	int ret;

	entry = applesmc_get_entry_by_index(key_at_index);
	if (IS_ERR(entry))
		return PTR_ERR(entry);
	ret = applesmc_read_entry(entry, sysfsbuf, entry->len);
	if (ret)
		return ret;

	return entry->len;
}

static ssize_t applesmc_key_at_index_data_length_show(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	const struct applesmc_entry *entry;

	entry = applesmc_get_entry_by_index(key_at_index);
	if (IS_ERR(entry))
		return PTR_ERR(entry);

	return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", entry->len);
}

static ssize_t applesmc_key_at_index_type_show(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	const struct applesmc_entry *entry;

	entry = applesmc_get_entry_by_index(key_at_index);
	if (IS_ERR(entry))
		return PTR_ERR(entry);

	return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->type);
}

static ssize_t applesmc_key_at_index_name_show(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	const struct applesmc_entry *entry;

	entry = applesmc_get_entry_by_index(key_at_index);
	if (IS_ERR(entry))
		return PTR_ERR(entry);

	return snprintf(sysfsbuf, PAGE_SIZE, "%s\n", entry->key);
}

static ssize_t applesmc_key_at_index_show(struct device *dev,
				struct device_attribute *attr, char *sysfsbuf)
{
	return snprintf(sysfsbuf, PAGE_SIZE, "%d\n", key_at_index);
}

static ssize_t applesmc_key_at_index_store(struct device *dev,
	struct device_attribute *attr, const char *sysfsbuf, size_t count)
{
	unsigned long newkey;

	if (kstrtoul(sysfsbuf, 10, &newkey) < 0
	    || newkey >= smcreg.key_count)
		return -EINVAL;

	key_at_index = newkey;
	return count;
}

static struct led_classdev applesmc_backlight = {
	.name			= "smc::kbd_backlight",
	.default_trigger	= "nand-disk",
	.brightness_set		= applesmc_brightness_set,
};

static struct applesmc_node_group info_group[] = {
	{ "name", applesmc_name_show },
	{ "key_count", applesmc_key_count_show },
	{ "key_at_index", applesmc_key_at_index_show, applesmc_key_at_index_store },
	{ "key_at_index_name", applesmc_key_at_index_name_show },
	{ "key_at_index_type", applesmc_key_at_index_type_show },
	{ "key_at_index_data_length", applesmc_key_at_index_data_length_show },
	{ "key_at_index_data", applesmc_key_at_index_read_show },
	{ }
};

static struct applesmc_node_group accelerometer_group[] = {
	{ "position", applesmc_position_show },
	{ "calibrate", applesmc_calibrate_show, applesmc_calibrate_store },
	{ }
};

static struct applesmc_node_group light_sensor_group[] = {
	{ "light", applesmc_light_show },
	{ }
};

static struct applesmc_node_group fan_group[] = {
	{ "fan%d_label", applesmc_show_fan_position },
	{ "fan%d_input", applesmc_show_fan_speed, NULL, 0 },
	{ "fan%d_min", applesmc_show_fan_speed, applesmc_store_fan_speed, 1 },
	{ "fan%d_max", applesmc_show_fan_speed, NULL, 2 },
	{ "fan%d_safe", applesmc_show_fan_speed, NULL, 3 },
	{ "fan%d_output", applesmc_show_fan_speed, applesmc_store_fan_speed, 4 },
	{ "fan%d_manual", applesmc_show_fan_manual, applesmc_store_fan_manual },
	{ }
};

static struct applesmc_node_group temp_group[] = {
	{ "temp%d_label", applesmc_show_sensor_label },
	{ "temp%d_input", applesmc_show_temperature },
	{ }
};

/* Module stuff */

/*
 * applesmc_destroy_nodes - remove files and free associated memory
 */
static void applesmc_destroy_nodes(struct applesmc_node_group *groups)
{
	struct applesmc_node_group *grp;
	struct applesmc_dev_attr *node;

	for (grp = groups; grp->nodes; grp++) {
		for (node = grp->nodes; node->sda.dev_attr.attr.name; node++)
			sysfs_remove_file(&pdev->dev.kobj,
					  &node->sda.dev_attr.attr);
		kfree(grp->nodes);
		grp->nodes = NULL;
	}
}

/*
 * applesmc_create_nodes - create a two-dimensional group of sysfs files
 */
static int applesmc_create_nodes(struct applesmc_node_group *groups, int num)
{
	struct applesmc_node_group *grp;
	struct applesmc_dev_attr *node;
	struct attribute *attr;
	int ret, i;

	for (grp = groups; grp->format; grp++) {
		grp->nodes = kcalloc(num + 1, sizeof(*node), GFP_KERNEL);
		if (!grp->nodes) {
			ret = -ENOMEM;
			goto out;
		}
		for (i = 0; i < num; i++) {
			node = &grp->nodes[i];
			sprintf(node->name, grp->format, i + 1);
			node->sda.index = (grp->option << 16) | (i & 0xffff);
			node->sda.dev_attr.show = grp->show;
			node->sda.dev_attr.store = grp->store;
			attr = &node->sda.dev_attr.attr;
			sysfs_attr_init(attr);
			attr->name = node->name;
			attr->mode = S_IRUGO | (grp->store ? S_IWUSR : 0);
			ret = sysfs_create_file(&pdev->dev.kobj, attr);
			if (ret) {
				attr->name = NULL;
				goto out;
			}
		}
	}

	return 0;
out:
	applesmc_destroy_nodes(groups);
	return ret;
}

/* Create accelerometer resources */
static int applesmc_create_accelerometer(void)
{
	struct input_dev *idev;
	int ret;

	if (!smcreg.has_accelerometer)
		return 0;

	ret = applesmc_create_nodes(accelerometer_group, 1);
	if (ret)
		goto out;

	applesmc_idev = input_allocate_polled_device();
	if (!applesmc_idev) {
		ret = -ENOMEM;
		goto out_sysfs;
	}

	applesmc_idev->poll = applesmc_idev_poll;
	applesmc_idev->poll_interval = APPLESMC_POLL_INTERVAL;

	/* initial calibrate for the input device */
	applesmc_calibrate();

	/* initialize the input device */
	idev = applesmc_idev->input;
	idev->name = "applesmc";
	idev->id.bustype = BUS_HOST;
	idev->dev.parent = &pdev->dev;
	idev->evbit[0] = BIT_MASK(EV_ABS);
	input_set_abs_params(idev, ABS_X,
			-256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);
	input_set_abs_params(idev, ABS_Y,
			-256, 256, APPLESMC_INPUT_FUZZ, APPLESMC_INPUT_FLAT);

	ret = input_register_polled_device(applesmc_idev);
	if (ret)
		goto out_idev;

	return 0;

out_idev:
	input_free_polled_device(applesmc_idev);

out_sysfs:
	applesmc_destroy_nodes(accelerometer_group);

out:
	pr_warn("driver init failed (ret=%d)!\n", ret);
	return ret;
}

/* Release all resources used by the accelerometer */
static void applesmc_release_accelerometer(void)
{
	if (!smcreg.has_accelerometer)
		return;
	input_unregister_polled_device(applesmc_idev);
	input_free_polled_device(applesmc_idev);
	applesmc_destroy_nodes(accelerometer_group);
}

static int applesmc_create_light_sensor(void)
{
	if (!smcreg.num_light_sensors)
		return 0;
	return applesmc_create_nodes(light_sensor_group, 1);
}

static void applesmc_release_light_sensor(void)
{
	if (!smcreg.num_light_sensors)
		return;
	applesmc_destroy_nodes(light_sensor_group);
}

static int applesmc_create_key_backlight(void)
{
	if (!smcreg.has_key_backlight)
		return 0;
	applesmc_led_wq = create_singlethread_workqueue("applesmc-led");
	if (!applesmc_led_wq)
		return -ENOMEM;
	return led_classdev_register(&pdev->dev, &applesmc_backlight);
}

static void applesmc_release_key_backlight(void)
{
	if (!smcreg.has_key_backlight)
		return;
	led_classdev_unregister(&applesmc_backlight);
	destroy_workqueue(applesmc_led_wq);
}

static int applesmc_dmi_match(const struct dmi_system_id *id)
{
	return 1;
}

/*
 * Note that DMI_MATCH(...,"MacBook") will match "MacBookPro1,1".
 * So we need to put "Apple MacBook Pro" before "Apple MacBook".
 */
static __initdata struct dmi_system_id applesmc_whitelist[] = {
	{ applesmc_dmi_match, "Apple MacBook Air", {
	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
	  DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir") },
	},
	{ applesmc_dmi_match, "Apple MacBook Pro", {
	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
	  DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro") },
	},
	{ applesmc_dmi_match, "Apple MacBook", {
	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
	  DMI_MATCH(DMI_PRODUCT_NAME, "MacBook") },
	},
	{ applesmc_dmi_match, "Apple Macmini", {
	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
	  DMI_MATCH(DMI_PRODUCT_NAME, "Macmini") },
	},
	{ applesmc_dmi_match, "Apple MacPro", {
	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
	  DMI_MATCH(DMI_PRODUCT_NAME, "MacPro") },
	},
	{ applesmc_dmi_match, "Apple iMac", {
	  DMI_MATCH(DMI_BOARD_VENDOR, "Apple"),
	  DMI_MATCH(DMI_PRODUCT_NAME, "iMac") },
	},
	{ .ident = NULL }
};

static int __init applesmc_init(void)
{
	int ret;

	if (!dmi_check_system(applesmc_whitelist)) {
		pr_warn("supported laptop not found!\n");
		ret = -ENODEV;
		goto out;
	}

	if (!request_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS,
								"applesmc")) {
		ret = -ENXIO;
		goto out;
	}

	ret = platform_driver_register(&applesmc_driver);
	if (ret)
		goto out_region;

	pdev = platform_device_register_simple("applesmc", APPLESMC_DATA_PORT,
					       NULL, 0);
	if (IS_ERR(pdev)) {
		ret = PTR_ERR(pdev);
		goto out_driver;
	}

	/* create register cache */
	ret = applesmc_init_smcreg();
	if (ret)
		goto out_device;

	ret = applesmc_create_nodes(info_group, 1);
	if (ret)
		goto out_smcreg;

	ret = applesmc_create_nodes(fan_group, smcreg.fan_count);
	if (ret)
		goto out_info;

	ret = applesmc_create_nodes(temp_group, smcreg.index_count);
	if (ret)
		goto out_fans;

	ret = applesmc_create_accelerometer();
	if (ret)
		goto out_temperature;

	ret = applesmc_create_light_sensor();
	if (ret)
		goto out_accelerometer;

	ret = applesmc_create_key_backlight();
	if (ret)
		goto out_light_sysfs;

	hwmon_dev = hwmon_device_register(&pdev->dev);
	if (IS_ERR(hwmon_dev)) {
		ret = PTR_ERR(hwmon_dev);
		goto out_light_ledclass;
	}

	return 0;

out_light_ledclass:
	applesmc_release_key_backlight();
out_light_sysfs:
	applesmc_release_light_sensor();
out_accelerometer:
	applesmc_release_accelerometer();
out_temperature:
	applesmc_destroy_nodes(temp_group);
out_fans:
	applesmc_destroy_nodes(fan_group);
out_info:
	applesmc_destroy_nodes(info_group);
out_smcreg:
	applesmc_destroy_smcreg();
out_device:
	platform_device_unregister(pdev);
out_driver:
	platform_driver_unregister(&applesmc_driver);
out_region:
	release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
out:
	pr_warn("driver init failed (ret=%d)!\n", ret);
	return ret;
}

static void __exit applesmc_exit(void)
{
	hwmon_device_unregister(hwmon_dev);
	applesmc_release_key_backlight();
	applesmc_release_light_sensor();
	applesmc_release_accelerometer();
	applesmc_destroy_nodes(temp_group);
	applesmc_destroy_nodes(fan_group);
	applesmc_destroy_nodes(info_group);
	applesmc_destroy_smcreg();
	platform_device_unregister(pdev);
	platform_driver_unregister(&applesmc_driver);
	release_region(APPLESMC_DATA_PORT, APPLESMC_NR_PORTS);
}

module_init(applesmc_init);
module_exit(applesmc_exit);

MODULE_AUTHOR("Nicolas Boichat");
MODULE_DESCRIPTION("Apple SMC");
MODULE_LICENSE("GPL v2");
MODULE_DEVICE_TABLE(dmi, applesmc_whitelist);