nct6683.c 35.8 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 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458
/*
 * nct6683 - Driver for the hardware monitoring functionality of
 *	     Nuvoton NCT6683D eSIO
 *
 * Copyright (C) 2013  Guenter Roeck <linux@roeck-us.net>
 *
 * Derived from nct6775 driver
 * Copyright (C) 2012, 2013  Guenter Roeck <linux@roeck-us.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * Supports the following chips:
 *
 * Chip        #vin    #fan    #pwm    #temp  chip ID
 * nct6683d     21(1)   16      8       32(1) 0xc730
 *
 * Notes:
 *	(1) Total number of vin and temp inputs is 32.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

enum kinds { nct6683 };

static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force, "Set to one to enable detection on non-Intel boards");

static const char * const nct6683_device_names[] = {
	"nct6683",
};

static const char * const nct6683_chip_names[] = {
	"NCT6683D",
};

#define DRVNAME "nct6683"

/*
 * Super-I/O constants and functions
 */

#define NCT6683_LD_ACPI		0x0a
#define NCT6683_LD_HWM		0x0b
#define NCT6683_LD_VID		0x0d

#define SIO_REG_LDSEL		0x07	/* Logical device select */
#define SIO_REG_DEVID		0x20	/* Device ID (2 bytes) */
#define SIO_REG_ENABLE		0x30	/* Logical device enable */
#define SIO_REG_ADDR		0x60	/* Logical device address (2 bytes) */

#define SIO_NCT6681_ID		0xb270	/* for later */
#define SIO_NCT6683_ID		0xc730
#define SIO_ID_MASK		0xFFF0

static inline void
superio_outb(int ioreg, int reg, int val)
{
	outb(reg, ioreg);
	outb(val, ioreg + 1);
}

static inline int
superio_inb(int ioreg, int reg)
{
	outb(reg, ioreg);
	return inb(ioreg + 1);
}

static inline void
superio_select(int ioreg, int ld)
{
	outb(SIO_REG_LDSEL, ioreg);
	outb(ld, ioreg + 1);
}

static inline int
superio_enter(int ioreg)
{
	/*
	 * Try to reserve <ioreg> and <ioreg + 1> for exclusive access.
	 */
	if (!request_muxed_region(ioreg, 2, DRVNAME))
		return -EBUSY;

	outb(0x87, ioreg);
	outb(0x87, ioreg);

	return 0;
}

static inline void
superio_exit(int ioreg)
{
	outb(0xaa, ioreg);
	outb(0x02, ioreg);
	outb(0x02, ioreg + 1);
	release_region(ioreg, 2);
}

/*
 * ISA constants
 */

#define IOREGION_ALIGNMENT	(~7)
#define IOREGION_OFFSET		4	/* Use EC port 1 */
#define IOREGION_LENGTH		4

#define EC_PAGE_REG		0
#define EC_INDEX_REG		1
#define EC_DATA_REG		2
#define EC_EVENT_REG		3

/* Common and NCT6683 specific data */

#define NCT6683_NUM_REG_MON		32
#define NCT6683_NUM_REG_FAN		16
#define NCT6683_NUM_REG_PWM		8

#define NCT6683_REG_MON(x)		(0x100 + (x) * 2)
#define NCT6683_REG_FAN_RPM(x)		(0x140 + (x) * 2)
#define NCT6683_REG_PWM(x)		(0x160 + (x))

#define NCT6683_REG_MON_STS(x)		(0x174 + (x))
#define NCT6683_REG_IDLE(x)		(0x178 + (x))

#define NCT6683_REG_FAN_STS(x)		(0x17c + (x))
#define NCT6683_REG_FAN_ERRSTS		0x17e
#define NCT6683_REG_FAN_INITSTS		0x17f

#define NCT6683_HWM_CFG			0x180

#define NCT6683_REG_MON_CFG(x)		(0x1a0 + (x))
#define NCT6683_REG_FANIN_CFG(x)	(0x1c0 + (x))
#define NCT6683_REG_FANOUT_CFG(x)	(0x1d0 + (x))

#define NCT6683_REG_INTEL_TEMP_MAX(x)	(0x901 + (x) * 16)
#define NCT6683_REG_INTEL_TEMP_CRIT(x)	(0x90d + (x) * 16)

#define NCT6683_REG_TEMP_HYST(x)	(0x330 + (x))		/* 8 bit */
#define NCT6683_REG_TEMP_MAX(x)		(0x350 + (x))		/* 8 bit */
#define NCT6683_REG_MON_HIGH(x)		(0x370 + (x) * 2)	/* 8 bit */
#define NCT6683_REG_MON_LOW(x)		(0x371 + (x) * 2)	/* 8 bit */

#define NCT6683_REG_FAN_MIN(x)		(0x3b8 + (x) * 2)	/* 16 bit */

#define NCT6683_REG_CUSTOMER_ID		0x602
#define NCT6683_CUSTOMER_ID_INTEL	0x805

#define NCT6683_REG_BUILD_YEAR		0x604
#define NCT6683_REG_BUILD_MONTH		0x605
#define NCT6683_REG_BUILD_DAY		0x606
#define NCT6683_REG_SERIAL		0x607
#define NCT6683_REG_VERSION_HI		0x608
#define NCT6683_REG_VERSION_LO		0x609

#define NCT6683_REG_CR_CASEOPEN		0xe8
#define NCT6683_CR_CASEOPEN_MASK	(1 << 7)

#define NCT6683_REG_CR_BEEP		0xe0
#define NCT6683_CR_BEEP_MASK		(1 << 6)

static const char *const nct6683_mon_label[] = {
	NULL,	/* disabled */
	"Local",
	"Diode 0 (curr)",
	"Diode 1 (curr)",
	"Diode 2 (curr)",
	"Diode 0 (volt)",
	"Diode 1 (volt)",
	"Diode 2 (volt)",
	"Thermistor 14",
	"Thermistor 15",
	"Thermistor 16",
	"Thermistor 0",
	"Thermistor 1",
	"Thermistor 2",
	"Thermistor 3",
	"Thermistor 4",
	"Thermistor 5",		/* 0x10 */
	"Thermistor 6",
	"Thermistor 7",
	"Thermistor 8",
	"Thermistor 9",
	"Thermistor 10",
	"Thermistor 11",
	"Thermistor 12",
	"Thermistor 13",
	NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	"PECI 0.0",		/* 0x20 */
	"PECI 1.0",
	"PECI 2.0",
	"PECI 3.0",
	"PECI 0.1",
	"PECI 1.1",
	"PECI 2.1",
	"PECI 3.1",
	"PECI DIMM 0",
	"PECI DIMM 1",
	"PECI DIMM 2",
	"PECI DIMM 3",
	NULL, NULL, NULL, NULL,
	"PCH CPU",		/* 0x30 */
	"PCH CHIP",
	"PCH CHIP CPU MAX",
	"PCH MCH",
	"PCH DIMM 0",
	"PCH DIMM 1",
	"PCH DIMM 2",
	"PCH DIMM 3",
	"SMBus 0",
	"SMBus 1",
	"SMBus 2",
	"SMBus 3",
	"SMBus 4",
	"SMBus 5",
	"DIMM 0",
	"DIMM 1",
	"DIMM 2",		/* 0x40 */
	"DIMM 3",
	"AMD TSI Addr 90h",
	"AMD TSI Addr 92h",
	"AMD TSI Addr 94h",
	"AMD TSI Addr 96h",
	"AMD TSI Addr 98h",
	"AMD TSI Addr 9ah",
	"AMD TSI Addr 9ch",
	"AMD TSI Addr 9dh",
	NULL, NULL, NULL, NULL, NULL, NULL,
	"Virtual 0",		/* 0x50 */
	"Virtual 1",
	"Virtual 2",
	"Virtual 3",
	"Virtual 4",
	"Virtual 5",
	"Virtual 6",
	"Virtual 7",
	NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
	"VCC",			/* 0x60 voltage sensors */
	"VSB",
	"AVSB",
	"VTT",
	"VBAT",
	"VREF",
	"VIN0",
	"VIN1",
	"VIN2",
	"VIN3",
	"VIN4",
	"VIN5",
	"VIN6",
	"VIN7",
	"VIN8",
	"VIN9",
	"VIN10",
	"VIN11",
	"VIN12",
	"VIN13",
	"VIN14",
	"VIN15",
	"VIN16",
};

#define NUM_MON_LABELS		ARRAY_SIZE(nct6683_mon_label)
#define MON_VOLTAGE_START	0x60

/* ------------------------------------------------------- */

struct nct6683_data {
	int addr;		/* IO base of EC space */
	int sioreg;		/* SIO register */
	enum kinds kind;
	u16 customer_id;

	struct device *hwmon_dev;
	const struct attribute_group *groups[6];

	int temp_num;			/* number of temperature attributes */
	u8 temp_index[NCT6683_NUM_REG_MON];
	u8 temp_src[NCT6683_NUM_REG_MON];

	u8 in_num;			/* number of voltage attributes */
	u8 in_index[NCT6683_NUM_REG_MON];
	u8 in_src[NCT6683_NUM_REG_MON];

	struct mutex update_lock;	/* used to protect sensor updates */
	bool valid;			/* true if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	/* Voltage attribute values */
	u8 in[3][NCT6683_NUM_REG_MON];	/* [0]=in, [1]=in_max, [2]=in_min */

	/* Temperature attribute values */
	s16 temp_in[NCT6683_NUM_REG_MON];
	s8 temp[4][NCT6683_NUM_REG_MON];/* [0]=min, [1]=max, [2]=hyst,
					 * [3]=crit
					 */

	/* Fan attribute values */
	unsigned int rpm[NCT6683_NUM_REG_FAN];
	u16 fan_min[NCT6683_NUM_REG_FAN];
	u8 fanin_cfg[NCT6683_NUM_REG_FAN];
	u8 fanout_cfg[NCT6683_NUM_REG_FAN];
	u16 have_fan;			/* some fan inputs can be disabled */

	u8 have_pwm;
	u8 pwm[NCT6683_NUM_REG_PWM];

#ifdef CONFIG_PM
	/* Remember extra register values over suspend/resume */
	u8 hwm_cfg;
#endif
};

struct nct6683_sio_data {
	int sioreg;
	enum kinds kind;
};

struct sensor_device_template {
	struct device_attribute dev_attr;
	union {
		struct {
			u8 nr;
			u8 index;
		} s;
		int index;
	} u;
	bool s2;	/* true if both index and nr are used */
};

struct sensor_device_attr_u {
	union {
		struct sensor_device_attribute a1;
		struct sensor_device_attribute_2 a2;
	} u;
	char name[32];
};

#define __TEMPLATE_ATTR(_template, _mode, _show, _store) {	\
	.attr = {.name = _template, .mode = _mode },		\
	.show	= _show,					\
	.store	= _store,					\
}

#define SENSOR_DEVICE_TEMPLATE(_template, _mode, _show, _store, _index)	\
	{ .dev_attr = __TEMPLATE_ATTR(_template, _mode, _show, _store),	\
	  .u.index = _index,						\
	  .s2 = false }

#define SENSOR_DEVICE_TEMPLATE_2(_template, _mode, _show, _store,	\
				 _nr, _index)				\
	{ .dev_attr = __TEMPLATE_ATTR(_template, _mode, _show, _store),	\
	  .u.s.index = _index,						\
	  .u.s.nr = _nr,						\
	  .s2 = true }

#define SENSOR_TEMPLATE(_name, _template, _mode, _show, _store, _index)	\
static struct sensor_device_template sensor_dev_template_##_name	\
	= SENSOR_DEVICE_TEMPLATE(_template, _mode, _show, _store,	\
				 _index)

#define SENSOR_TEMPLATE_2(_name, _template, _mode, _show, _store,	\
			  _nr, _index)					\
static struct sensor_device_template sensor_dev_template_##_name	\
	= SENSOR_DEVICE_TEMPLATE_2(_template, _mode, _show, _store,	\
				 _nr, _index)

struct sensor_template_group {
	struct sensor_device_template **templates;
	umode_t (*is_visible)(struct kobject *, struct attribute *, int);
	int base;
};

static struct attribute_group *
nct6683_create_attr_group(struct device *dev, struct sensor_template_group *tg,
			  int repeat)
{
	struct sensor_device_attribute_2 *a2;
	struct sensor_device_attribute *a;
	struct sensor_device_template **t;
	struct sensor_device_attr_u *su;
	struct attribute_group *group;
	struct attribute **attrs;
	int i, j, count;

	if (repeat <= 0)
		return ERR_PTR(-EINVAL);

	t = tg->templates;
	for (count = 0; *t; t++, count++)
		;

	if (count == 0)
		return ERR_PTR(-EINVAL);

	group = devm_kzalloc(dev, sizeof(*group), GFP_KERNEL);
	if (group == NULL)
		return ERR_PTR(-ENOMEM);

	attrs = devm_kzalloc(dev, sizeof(*attrs) * (repeat * count + 1),
			     GFP_KERNEL);
	if (attrs == NULL)
		return ERR_PTR(-ENOMEM);

	su = devm_kzalloc(dev, sizeof(*su) * repeat * count,
			  GFP_KERNEL);
	if (su == NULL)
		return ERR_PTR(-ENOMEM);

	group->attrs = attrs;
	group->is_visible = tg->is_visible;

	for (i = 0; i < repeat; i++) {
		t = tg->templates;
		for (j = 0; *t != NULL; j++) {
			snprintf(su->name, sizeof(su->name),
				 (*t)->dev_attr.attr.name, tg->base + i);
			if ((*t)->s2) {
				a2 = &su->u.a2;
				sysfs_attr_init(&a2->dev_attr.attr);
				a2->dev_attr.attr.name = su->name;
				a2->nr = (*t)->u.s.nr + i;
				a2->index = (*t)->u.s.index;
				a2->dev_attr.attr.mode =
				  (*t)->dev_attr.attr.mode;
				a2->dev_attr.show = (*t)->dev_attr.show;
				a2->dev_attr.store = (*t)->dev_attr.store;
				*attrs = &a2->dev_attr.attr;
			} else {
				a = &su->u.a1;
				sysfs_attr_init(&a->dev_attr.attr);
				a->dev_attr.attr.name = su->name;
				a->index = (*t)->u.index + i;
				a->dev_attr.attr.mode =
				  (*t)->dev_attr.attr.mode;
				a->dev_attr.show = (*t)->dev_attr.show;
				a->dev_attr.store = (*t)->dev_attr.store;
				*attrs = &a->dev_attr.attr;
			}
			attrs++;
			su++;
			t++;
		}
	}

	return group;
}

/* LSB is 16 mV, except for the following sources, where it is 32 mV */
#define MON_SRC_VCC	0x60
#define MON_SRC_VSB	0x61
#define MON_SRC_AVSB	0x62
#define MON_SRC_VBAT	0x64

static inline long in_from_reg(u16 reg, u8 src)
{
	int scale = 16;

	if (src == MON_SRC_VCC || src == MON_SRC_VSB || src == MON_SRC_AVSB ||
	    src == MON_SRC_VBAT)
		scale <<= 1;
	return reg * scale;
}

static inline u16 in_to_reg(u32 val, u8 src)
{
	int scale = 16;

	if (src == MON_SRC_VCC || src == MON_SRC_VSB || src == MON_SRC_AVSB ||
	    src == MON_SRC_VBAT)
		scale <<= 1;

	return clamp_val(DIV_ROUND_CLOSEST(val, scale), 0, 127);
}

static u16 nct6683_read(struct nct6683_data *data, u16 reg)
{
	int res;

	outb_p(0xff, data->addr + EC_PAGE_REG);		/* unlock */
	outb_p(reg >> 8, data->addr + EC_PAGE_REG);
	outb_p(reg & 0xff, data->addr + EC_INDEX_REG);
	res = inb_p(data->addr + EC_DATA_REG);
	return res;
}

static u16 nct6683_read16(struct nct6683_data *data, u16 reg)
{
	return (nct6683_read(data, reg) << 8) | nct6683_read(data, reg + 1);
}

static void nct6683_write(struct nct6683_data *data, u16 reg, u16 value)
{
	outb_p(0xff, data->addr + EC_PAGE_REG);		/* unlock */
	outb_p(reg >> 8, data->addr + EC_PAGE_REG);
	outb_p(reg & 0xff, data->addr + EC_INDEX_REG);
	outb_p(value & 0xff, data->addr + EC_DATA_REG);
}

static int get_in_reg(struct nct6683_data *data, int nr, int index)
{
	int ch = data->in_index[index];
	int reg = -EINVAL;

	switch (nr) {
	case 0:
		reg = NCT6683_REG_MON(ch);
		break;
	case 1:
		if (data->customer_id != NCT6683_CUSTOMER_ID_INTEL)
			reg = NCT6683_REG_MON_LOW(ch);
		break;
	case 2:
		if (data->customer_id != NCT6683_CUSTOMER_ID_INTEL)
			reg = NCT6683_REG_MON_HIGH(ch);
		break;
	default:
		break;
	}
	return reg;
}

static int get_temp_reg(struct nct6683_data *data, int nr, int index)
{
	int ch = data->temp_index[index];
	int reg = -EINVAL;

	switch (data->customer_id) {
	case NCT6683_CUSTOMER_ID_INTEL:
		switch (nr) {
		default:
		case 1:	/* max */
			reg = NCT6683_REG_INTEL_TEMP_MAX(ch);
			break;
		case 3:	/* crit */
			reg = NCT6683_REG_INTEL_TEMP_CRIT(ch);
			break;
		}
		break;
	default:
		switch (nr) {
		default:
		case 0:	/* min */
			reg = NCT6683_REG_MON_LOW(ch);
			break;
		case 1:	/* max */
			reg = NCT6683_REG_TEMP_MAX(ch);
			break;
		case 2:	/* hyst */
			reg = NCT6683_REG_TEMP_HYST(ch);
			break;
		case 3:	/* crit */
			reg = NCT6683_REG_MON_HIGH(ch);
			break;
		}
		break;
	}
	return reg;
}

static void nct6683_update_pwm(struct device *dev)
{
	struct nct6683_data *data = dev_get_drvdata(dev);
	int i;

	for (i = 0; i < NCT6683_NUM_REG_PWM; i++) {
		if (!(data->have_pwm & (1 << i)))
			continue;
		data->pwm[i] = nct6683_read(data, NCT6683_REG_PWM(i));
	}
}

static struct nct6683_data *nct6683_update_device(struct device *dev)
{
	struct nct6683_data *data = dev_get_drvdata(dev);
	int i, j;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		/* Measured voltages and limits */
		for (i = 0; i < data->in_num; i++) {
			for (j = 0; j < 3; j++) {
				int reg = get_in_reg(data, j, i);

				if (reg >= 0)
					data->in[j][i] =
						nct6683_read(data, reg);
			}
		}

		/* Measured temperatures and limits */
		for (i = 0; i < data->temp_num; i++) {
			u8 ch = data->temp_index[i];

			data->temp_in[i] = nct6683_read16(data,
							  NCT6683_REG_MON(ch));
			for (j = 0; j < 4; j++) {
				int reg = get_temp_reg(data, j, i);

				if (reg >= 0)
					data->temp[j][i] =
						nct6683_read(data, reg);
			}
		}

		/* Measured fan speeds and limits */
		for (i = 0; i < ARRAY_SIZE(data->rpm); i++) {
			if (!(data->have_fan & (1 << i)))
				continue;

			data->rpm[i] = nct6683_read16(data,
						NCT6683_REG_FAN_RPM(i));
			data->fan_min[i] = nct6683_read16(data,
						NCT6683_REG_FAN_MIN(i));
		}

		nct6683_update_pwm(dev);

		data->last_updated = jiffies;
		data->valid = true;
	}

	mutex_unlock(&data->update_lock);
	return data;
}

/*
 * Sysfs callback functions
 */
static ssize_t
show_in_label(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct6683_data *data = nct6683_update_device(dev);
	int nr = sattr->index;

	return sprintf(buf, "%s\n", nct6683_mon_label[data->in_src[nr]]);
}

static ssize_t
show_in_reg(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct6683_data *data = nct6683_update_device(dev);
	int index = sattr->index;
	int nr = sattr->nr;

	return sprintf(buf, "%ld\n",
		       in_from_reg(data->in[index][nr], data->in_index[index]));
}

static umode_t nct6683_in_is_visible(struct kobject *kobj,
				     struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct6683_data *data = dev_get_drvdata(dev);
	int nr = index % 4;	/* attribute */

	/*
	 * Voltage limits exist for Intel boards,
	 * but register location and encoding is unknown
	 */
	if ((nr == 2 || nr == 3) &&
	    data->customer_id == NCT6683_CUSTOMER_ID_INTEL)
		return 0;

	return attr->mode;
}

SENSOR_TEMPLATE(in_label, "in%d_label", S_IRUGO, show_in_label, NULL, 0);
SENSOR_TEMPLATE_2(in_input, "in%d_input", S_IRUGO, show_in_reg, NULL, 0, 0);
SENSOR_TEMPLATE_2(in_min, "in%d_min", S_IRUGO, show_in_reg, NULL, 0, 1);
SENSOR_TEMPLATE_2(in_max, "in%d_max", S_IRUGO, show_in_reg, NULL, 0, 2);

static struct sensor_device_template *nct6683_attributes_in_template[] = {
	&sensor_dev_template_in_label,
	&sensor_dev_template_in_input,
	&sensor_dev_template_in_min,
	&sensor_dev_template_in_max,
	NULL
};

static struct sensor_template_group nct6683_in_template_group = {
	.templates = nct6683_attributes_in_template,
	.is_visible = nct6683_in_is_visible,
};

static ssize_t
show_fan(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct6683_data *data = nct6683_update_device(dev);

	return sprintf(buf, "%d\n", data->rpm[sattr->index]);
}

static ssize_t
show_fan_min(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6683_data *data = nct6683_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;

	return sprintf(buf, "%d\n", data->fan_min[nr]);
}

static ssize_t
show_fan_pulses(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct6683_data *data = nct6683_update_device(dev);

	return sprintf(buf, "%d\n",
		       ((data->fanin_cfg[sattr->index] >> 5) & 0x03) + 1);
}

static umode_t nct6683_fan_is_visible(struct kobject *kobj,
				      struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct6683_data *data = dev_get_drvdata(dev);
	int fan = index / 3;	/* fan index */
	int nr = index % 3;	/* attribute index */

	if (!(data->have_fan & (1 << fan)))
		return 0;

	/*
	 * Intel may have minimum fan speed limits,
	 * but register location and encoding are unknown.
	 */
	if (nr == 2 && data->customer_id == NCT6683_CUSTOMER_ID_INTEL)
		return 0;

	return attr->mode;
}

SENSOR_TEMPLATE(fan_input, "fan%d_input", S_IRUGO, show_fan, NULL, 0);
SENSOR_TEMPLATE(fan_pulses, "fan%d_pulses", S_IRUGO, show_fan_pulses, NULL, 0);
SENSOR_TEMPLATE(fan_min, "fan%d_min", S_IRUGO, show_fan_min, NULL, 0);

/*
 * nct6683_fan_is_visible uses the index into the following array
 * to determine if attributes should be created or not.
 * Any change in order or content must be matched.
 */
static struct sensor_device_template *nct6683_attributes_fan_template[] = {
	&sensor_dev_template_fan_input,
	&sensor_dev_template_fan_pulses,
	&sensor_dev_template_fan_min,
	NULL
};

static struct sensor_template_group nct6683_fan_template_group = {
	.templates = nct6683_attributes_fan_template,
	.is_visible = nct6683_fan_is_visible,
	.base = 1,
};

static ssize_t
show_temp_label(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct6683_data *data = nct6683_update_device(dev);
	int nr = sattr->index;

	return sprintf(buf, "%s\n", nct6683_mon_label[data->temp_src[nr]]);
}

static ssize_t
show_temp8(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct6683_data *data = nct6683_update_device(dev);
	int index = sattr->index;
	int nr = sattr->nr;

	return sprintf(buf, "%d\n", data->temp[index][nr] * 1000);
}

static ssize_t
show_temp_hyst(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct6683_data *data = nct6683_update_device(dev);
	int nr = sattr->index;
	int temp = data->temp[1][nr] - data->temp[2][nr];

	return sprintf(buf, "%d\n", temp * 1000);
}

static ssize_t
show_temp16(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct6683_data *data = nct6683_update_device(dev);
	int index = sattr->index;

	return sprintf(buf, "%d\n", (data->temp_in[index] / 128) * 500);
}

/*
 * Temperature sensor type is determined by temperature source
 * and can not be modified.
 * 0x02..0x07: Thermal diode
 * 0x08..0x18: Thermistor
 * 0x20..0x2b: Intel PECI
 * 0x42..0x49: AMD TSI
 * Others are unspecified (not visible)
 */

static int get_temp_type(u8 src)
{
	if (src >= 0x02 && src <= 0x07)
		return 3;	/* thermal diode */
	else if (src >= 0x08 && src <= 0x18)
		return 4;	/* thermistor */
	else if (src >= 0x20 && src <= 0x2b)
		return 6;	/* PECI */
	else if (src >= 0x42 && src <= 0x49)
		return 5;

	return 0;
}

static ssize_t
show_temp_type(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6683_data *data = nct6683_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	return sprintf(buf, "%d\n", get_temp_type(data->temp_src[nr]));
}

static umode_t nct6683_temp_is_visible(struct kobject *kobj,
				       struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct6683_data *data = dev_get_drvdata(dev);
	int temp = index / 7;	/* temp index */
	int nr = index % 7;	/* attribute index */

	/*
	 * Intel does not have low temperature limits or temperature hysteresis
	 * registers, or at least register location and encoding is unknown.
	 */
	if ((nr == 2 || nr == 4) &&
	    data->customer_id == NCT6683_CUSTOMER_ID_INTEL)
		return 0;

	if (nr == 6 && get_temp_type(data->temp_src[temp]) == 0)
		return 0;				/* type */

	return attr->mode;
}

SENSOR_TEMPLATE(temp_input, "temp%d_input", S_IRUGO, show_temp16, NULL, 0);
SENSOR_TEMPLATE(temp_label, "temp%d_label", S_IRUGO, show_temp_label, NULL, 0);
SENSOR_TEMPLATE_2(temp_min, "temp%d_min", S_IRUGO, show_temp8, NULL, 0, 0);
SENSOR_TEMPLATE_2(temp_max, "temp%d_max", S_IRUGO, show_temp8, NULL, 0, 1);
SENSOR_TEMPLATE(temp_max_hyst, "temp%d_max_hyst", S_IRUGO, show_temp_hyst, NULL,
		0);
SENSOR_TEMPLATE_2(temp_crit, "temp%d_crit", S_IRUGO, show_temp8, NULL, 0, 3);
SENSOR_TEMPLATE(temp_type, "temp%d_type", S_IRUGO, show_temp_type, NULL, 0);

/*
 * nct6683_temp_is_visible uses the index into the following array
 * to determine if attributes should be created or not.
 * Any change in order or content must be matched.
 */
static struct sensor_device_template *nct6683_attributes_temp_template[] = {
	&sensor_dev_template_temp_input,
	&sensor_dev_template_temp_label,
	&sensor_dev_template_temp_min,		/* 2 */
	&sensor_dev_template_temp_max,		/* 3 */
	&sensor_dev_template_temp_max_hyst,	/* 4 */
	&sensor_dev_template_temp_crit,		/* 5 */
	&sensor_dev_template_temp_type,		/* 6 */
	NULL
};

static struct sensor_template_group nct6683_temp_template_group = {
	.templates = nct6683_attributes_temp_template,
	.is_visible = nct6683_temp_is_visible,
	.base = 1,
};

static ssize_t
show_pwm(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6683_data *data = nct6683_update_device(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int index = sattr->index;

	return sprintf(buf, "%d\n", data->pwm[index]);
}

SENSOR_TEMPLATE(pwm, "pwm%d", S_IRUGO, show_pwm, NULL, 0);

static umode_t nct6683_pwm_is_visible(struct kobject *kobj,
				      struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct6683_data *data = dev_get_drvdata(dev);
	int pwm = index;	/* pwm index */

	if (!(data->have_pwm & (1 << pwm)))
		return 0;

	return attr->mode;
}

static struct sensor_device_template *nct6683_attributes_pwm_template[] = {
	&sensor_dev_template_pwm,
	NULL
};

static struct sensor_template_group nct6683_pwm_template_group = {
	.templates = nct6683_attributes_pwm_template,
	.is_visible = nct6683_pwm_is_visible,
	.base = 1,
};

static ssize_t
show_global_beep(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6683_data *data = dev_get_drvdata(dev);
	int ret;
	u8 reg;

	mutex_lock(&data->update_lock);

	ret = superio_enter(data->sioreg);
	if (ret)
		goto error;
	superio_select(data->sioreg, NCT6683_LD_HWM);
	reg = superio_inb(data->sioreg, NCT6683_REG_CR_BEEP);
	superio_exit(data->sioreg);

	mutex_unlock(&data->update_lock);

	return sprintf(buf, "%u\n", !!(reg & NCT6683_CR_BEEP_MASK));

error:
	mutex_unlock(&data->update_lock);
	return ret;
}

static ssize_t
store_global_beep(struct device *dev, struct device_attribute *attr,
		  const char *buf, size_t count)
{
	struct nct6683_data *data = dev_get_drvdata(dev);
	unsigned long val;
	u8 reg;
	int ret;

	if (kstrtoul(buf, 10, &val) || (val != 0 && val != 1))
		return -EINVAL;

	mutex_lock(&data->update_lock);

	ret = superio_enter(data->sioreg);
	if (ret) {
		count = ret;
		goto error;
	}

	superio_select(data->sioreg, NCT6683_LD_HWM);
	reg = superio_inb(data->sioreg, NCT6683_REG_CR_BEEP);
	if (val)
		reg |= NCT6683_CR_BEEP_MASK;
	else
		reg &= ~NCT6683_CR_BEEP_MASK;
	superio_outb(data->sioreg, NCT6683_REG_CR_BEEP, reg);
	superio_exit(data->sioreg);
error:
	mutex_unlock(&data->update_lock);
	return count;
}

/* Case open detection */

static ssize_t
show_caseopen(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6683_data *data = dev_get_drvdata(dev);
	int ret;
	u8 reg;

	mutex_lock(&data->update_lock);

	ret = superio_enter(data->sioreg);
	if (ret)
		goto error;
	superio_select(data->sioreg, NCT6683_LD_ACPI);
	reg = superio_inb(data->sioreg, NCT6683_REG_CR_CASEOPEN);
	superio_exit(data->sioreg);

	mutex_unlock(&data->update_lock);

	return sprintf(buf, "%u\n", !(reg & NCT6683_CR_CASEOPEN_MASK));

error:
	mutex_unlock(&data->update_lock);
	return ret;
}

static ssize_t
clear_caseopen(struct device *dev, struct device_attribute *attr,
	       const char *buf, size_t count)
{
	struct nct6683_data *data = dev_get_drvdata(dev);
	unsigned long val;
	u8 reg;
	int ret;

	if (kstrtoul(buf, 10, &val) || val != 0)
		return -EINVAL;

	mutex_lock(&data->update_lock);

	/*
	 * Use CR registers to clear caseopen status.
	 * Caseopen is activ low, clear by writing 1 into the register.
	 */

	ret = superio_enter(data->sioreg);
	if (ret) {
		count = ret;
		goto error;
	}

	superio_select(data->sioreg, NCT6683_LD_ACPI);
	reg = superio_inb(data->sioreg, NCT6683_REG_CR_CASEOPEN);
	reg |= NCT6683_CR_CASEOPEN_MASK;
	superio_outb(data->sioreg, NCT6683_REG_CR_CASEOPEN, reg);
	reg &= ~NCT6683_CR_CASEOPEN_MASK;
	superio_outb(data->sioreg, NCT6683_REG_CR_CASEOPEN, reg);
	superio_exit(data->sioreg);

	data->valid = false;	/* Force cache refresh */
error:
	mutex_unlock(&data->update_lock);
	return count;
}

static DEVICE_ATTR(intrusion0_alarm, S_IWUSR | S_IRUGO, show_caseopen,
		   clear_caseopen);
static DEVICE_ATTR(beep_enable, S_IWUSR | S_IRUGO, show_global_beep,
		   store_global_beep);

static struct attribute *nct6683_attributes_other[] = {
	&dev_attr_intrusion0_alarm.attr,
	&dev_attr_beep_enable.attr,
	NULL
};

static const struct attribute_group nct6683_group_other = {
	.attrs = nct6683_attributes_other,
};

/* Get the monitoring functions started */
static inline void nct6683_init_device(struct nct6683_data *data)
{
	u8 tmp;

	/* Start hardware monitoring if needed */
	tmp = nct6683_read(data, NCT6683_HWM_CFG);
	if (!(tmp & 0x80))
		nct6683_write(data, NCT6683_HWM_CFG, tmp | 0x80);
}

/*
 * There are a total of 24 fan inputs. Each can be configured as input
 * or as output. A maximum of 16 inputs and 8 outputs is configurable.
 */
static void
nct6683_setup_fans(struct nct6683_data *data)
{
	int i;
	u8 reg;

	for (i = 0; i < NCT6683_NUM_REG_FAN; i++) {
		reg = nct6683_read(data, NCT6683_REG_FANIN_CFG(i));
		if (reg & 0x80)
			data->have_fan |= 1 << i;
		data->fanin_cfg[i] = reg;
	}
	for (i = 0; i < NCT6683_NUM_REG_PWM; i++) {
		reg = nct6683_read(data, NCT6683_REG_FANOUT_CFG(i));
		if (reg & 0x80)
			data->have_pwm |= 1 << i;
		data->fanout_cfg[i] = reg;
	}
}

/*
 * Translation from monitoring register to temperature and voltage attributes
 * ==========================================================================
 *
 * There are a total of 32 monitoring registers. Each can be assigned to either
 * a temperature or voltage monitoring source.
 * NCT6683_REG_MON_CFG(x) defines assignment for each monitoring source.
 *
 * Temperature and voltage attribute mapping is determined by walking through
 * the NCT6683_REG_MON_CFG registers. If the assigned source is
 * a temperature, temp_index[n] is set to the monitor register index, and
 * temp_src[n] is set to the temperature source. If the assigned source is
 * a voltage, the respective values are stored in in_index[] and in_src[],
 * respectively.
 */

static void nct6683_setup_sensors(struct nct6683_data *data)
{
	u8 reg;
	int i;

	data->temp_num = 0;
	data->in_num = 0;
	for (i = 0; i < NCT6683_NUM_REG_MON; i++) {
		reg = nct6683_read(data, NCT6683_REG_MON_CFG(i)) & 0x7f;
		/* Ignore invalid assignments */
		if (reg >= NUM_MON_LABELS)
			continue;
		/* Skip if disabled or reserved */
		if (nct6683_mon_label[reg] == NULL)
			continue;
		if (reg < MON_VOLTAGE_START) {
			data->temp_index[data->temp_num] = i;
			data->temp_src[data->temp_num] = reg;
			data->temp_num++;
		} else {
			data->in_index[data->in_num] = i;
			data->in_src[data->in_num] = reg;
			data->in_num++;
		}
	}
}

static int nct6683_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct nct6683_sio_data *sio_data = dev->platform_data;
	struct attribute_group *group;
	struct nct6683_data *data;
	struct device *hwmon_dev;
	struct resource *res;
	int groups = 0;

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!devm_request_region(dev, res->start, IOREGION_LENGTH, DRVNAME))
		return -EBUSY;

	data = devm_kzalloc(dev, sizeof(struct nct6683_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->kind = sio_data->kind;
	data->sioreg = sio_data->sioreg;
	data->addr = res->start;
	mutex_init(&data->update_lock);
	platform_set_drvdata(pdev, data);

	data->customer_id = nct6683_read16(data, NCT6683_REG_CUSTOMER_ID);

	nct6683_init_device(data);
	nct6683_setup_fans(data);
	nct6683_setup_sensors(data);

	/* Register sysfs hooks */

	if (data->have_pwm) {
		group = nct6683_create_attr_group(dev,
						  &nct6683_pwm_template_group,
						  fls(data->have_pwm));
		if (IS_ERR(group))
			return PTR_ERR(group);
		data->groups[groups++] = group;
	}

	if (data->in_num) {
		group = nct6683_create_attr_group(dev,
						  &nct6683_in_template_group,
						  data->in_num);
		if (IS_ERR(group))
			return PTR_ERR(group);
		data->groups[groups++] = group;
	}

	if (data->have_fan) {
		group = nct6683_create_attr_group(dev,
						  &nct6683_fan_template_group,
						  fls(data->have_fan));
		if (IS_ERR(group))
			return PTR_ERR(group);
		data->groups[groups++] = group;
	}

	if (data->temp_num) {
		group = nct6683_create_attr_group(dev,
						  &nct6683_temp_template_group,
						  data->temp_num);
		if (IS_ERR(group))
			return PTR_ERR(group);
		data->groups[groups++] = group;
	}
	data->groups[groups++] = &nct6683_group_other;

	dev_info(dev, "%s EC firmware version %d.%d build %02x/%02x/%02x\n",
		 nct6683_chip_names[data->kind],
		 nct6683_read(data, NCT6683_REG_VERSION_HI),
		 nct6683_read(data, NCT6683_REG_VERSION_LO),
		 nct6683_read(data, NCT6683_REG_BUILD_MONTH),
		 nct6683_read(data, NCT6683_REG_BUILD_DAY),
		 nct6683_read(data, NCT6683_REG_BUILD_YEAR));

	hwmon_dev = devm_hwmon_device_register_with_groups(dev,
			nct6683_device_names[data->kind], data, data->groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

#ifdef CONFIG_PM
static int nct6683_suspend(struct device *dev)
{
	struct nct6683_data *data = nct6683_update_device(dev);

	mutex_lock(&data->update_lock);
	data->hwm_cfg = nct6683_read(data, NCT6683_HWM_CFG);
	mutex_unlock(&data->update_lock);

	return 0;
}

static int nct6683_resume(struct device *dev)
{
	struct nct6683_data *data = dev_get_drvdata(dev);

	mutex_lock(&data->update_lock);

	nct6683_write(data, NCT6683_HWM_CFG, data->hwm_cfg);

	/* Force re-reading all values */
	data->valid = false;
	mutex_unlock(&data->update_lock);

	return 0;
}

static const struct dev_pm_ops nct6683_dev_pm_ops = {
	.suspend = nct6683_suspend,
	.resume = nct6683_resume,
	.freeze = nct6683_suspend,
	.restore = nct6683_resume,
};

#define NCT6683_DEV_PM_OPS	(&nct6683_dev_pm_ops)
#else
#define NCT6683_DEV_PM_OPS	NULL
#endif /* CONFIG_PM */

static struct platform_driver nct6683_driver = {
	.driver = {
		.name	= DRVNAME,
		.pm	= NCT6683_DEV_PM_OPS,
	},
	.probe		= nct6683_probe,
};

static int __init nct6683_find(int sioaddr, struct nct6683_sio_data *sio_data)
{
	const char *board_vendor;
	int addr;
	u16 val;
	int err;

	/*
	 * Only run on Intel boards unless the 'force' module parameter is set
	 */
	if (!force) {
		board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
		if (!board_vendor || strcmp(board_vendor, "Intel Corporation"))
			return -ENODEV;
	}

	err = superio_enter(sioaddr);
	if (err)
		return err;

	val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8)
	       | superio_inb(sioaddr, SIO_REG_DEVID + 1);

	switch (val & SIO_ID_MASK) {
	case SIO_NCT6683_ID:
		sio_data->kind = nct6683;
		break;
	default:
		if (val != 0xffff)
			pr_debug("unsupported chip ID: 0x%04x\n", val);
		goto fail;
	}

	/* We have a known chip, find the HWM I/O address */
	superio_select(sioaddr, NCT6683_LD_HWM);
	val = (superio_inb(sioaddr, SIO_REG_ADDR) << 8)
	    | superio_inb(sioaddr, SIO_REG_ADDR + 1);
	addr = val & IOREGION_ALIGNMENT;
	if (addr == 0) {
		pr_err("EC base I/O port unconfigured\n");
		goto fail;
	}

	/* Activate logical device if needed */
	val = superio_inb(sioaddr, SIO_REG_ENABLE);
	if (!(val & 0x01)) {
		pr_err("EC is disabled\n");
		goto fail;
	}

	superio_exit(sioaddr);
	pr_info("Found %s or compatible chip at %#x:%#x\n",
		nct6683_chip_names[sio_data->kind], sioaddr, addr);
	sio_data->sioreg = sioaddr;

	return addr;

fail:
	superio_exit(sioaddr);
	return -ENODEV;
}

/*
 * when Super-I/O functions move to a separate file, the Super-I/O
 * bus will manage the lifetime of the device and this module will only keep
 * track of the nct6683 driver. But since we use platform_device_alloc(), we
 * must keep track of the device
 */
static struct platform_device *pdev[2];

static int __init sensors_nct6683_init(void)
{
	struct nct6683_sio_data sio_data;
	int sioaddr[2] = { 0x2e, 0x4e };
	struct resource res;
	bool found = false;
	int address;
	int i, err;

	err = platform_driver_register(&nct6683_driver);
	if (err)
		return err;

	/*
	 * initialize sio_data->kind and sio_data->sioreg.
	 *
	 * when Super-I/O functions move to a separate file, the Super-I/O
	 * driver will probe 0x2e and 0x4e and auto-detect the presence of a
	 * nct6683 hardware monitor, and call probe()
	 */
	for (i = 0; i < ARRAY_SIZE(pdev); i++) {
		address = nct6683_find(sioaddr[i], &sio_data);
		if (address <= 0)
			continue;

		found = true;

		pdev[i] = platform_device_alloc(DRVNAME, address);
		if (!pdev[i]) {
			err = -ENOMEM;
			goto exit_device_unregister;
		}

		err = platform_device_add_data(pdev[i], &sio_data,
					       sizeof(struct nct6683_sio_data));
		if (err)
			goto exit_device_put;

		memset(&res, 0, sizeof(res));
		res.name = DRVNAME;
		res.start = address + IOREGION_OFFSET;
		res.end = address + IOREGION_OFFSET + IOREGION_LENGTH - 1;
		res.flags = IORESOURCE_IO;

		err = acpi_check_resource_conflict(&res);
		if (err) {
			platform_device_put(pdev[i]);
			pdev[i] = NULL;
			continue;
		}

		err = platform_device_add_resources(pdev[i], &res, 1);
		if (err)
			goto exit_device_put;

		/* platform_device_add calls probe() */
		err = platform_device_add(pdev[i]);
		if (err)
			goto exit_device_put;
	}
	if (!found) {
		err = -ENODEV;
		goto exit_unregister;
	}

	return 0;

exit_device_put:
	platform_device_put(pdev[i]);
exit_device_unregister:
	while (--i >= 0) {
		if (pdev[i])
			platform_device_unregister(pdev[i]);
	}
exit_unregister:
	platform_driver_unregister(&nct6683_driver);
	return err;
}

static void __exit sensors_nct6683_exit(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(pdev); i++) {
		if (pdev[i])
			platform_device_unregister(pdev[i]);
	}
	platform_driver_unregister(&nct6683_driver);
}

MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("NCT6683D driver");
MODULE_LICENSE("GPL");

module_init(sensors_nct6683_init);
module_exit(sensors_nct6683_exit);