lm87.c 30.2 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
/*
 * lm87.c
 *
 * Copyright (C) 2000       Frodo Looijaard <frodol@dds.nl>
 *                          Philip Edelbrock <phil@netroedge.com>
 *                          Stephen Rousset <stephen.rousset@rocketlogix.com>
 *                          Dan Eaton <dan.eaton@rocketlogix.com>
 * Copyright (C) 2004-2008  Jean Delvare <khali@linux-fr.org>
 *
 * Original port to Linux 2.6 by Jeff Oliver.
 *
 * The LM87 is a sensor chip made by National Semiconductor. It monitors up
 * to 8 voltages (including its own power source), up to three temperatures
 * (its own plus up to two external ones) and up to two fans. The default
 * configuration is 6 voltages, two temperatures and two fans (see below).
 * Voltages are scaled internally with ratios such that the nominal value of
 * each voltage correspond to a register value of 192 (which means a
 * resolution of about 0.5% of the nominal value). Temperature values are
 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete
 * datasheet can be obtained from National's website at:
 *   http://www.national.com/pf/LM/LM87.html
 *
 * Some functions share pins, so not all functions are available at the same
 * time. Which are depends on the hardware setup. This driver normally
 * assumes that firmware configured the chip correctly. Where this is not
 * the case, platform code must set the I2C client's platform_data to point
 * to a u8 value to be written to the channel register.
 * For reference, here is the list of exclusive functions:
 *  - in0+in5 (default) or temp3
 *  - fan1 (default) or in6
 *  - fan2 (default) or in7
 *  - VID lines (default) or IRQ lines (not handled by this driver)
 *
 * The LM87 additionally features an analog output, supposedly usable to
 * control the speed of a fan. All new chips use pulse width modulation
 * instead. The LM87 is the only hardware monitoring chipset I know of
 * which uses amplitude modulation. Be careful when using this feature.
 *
 * This driver also supports the ADM1024, a sensor chip made by Analog
 * Devices. That chip is fully compatible with the LM87. Complete
 * datasheet can be obtained from Analog's website at:
 *   http://www.analog.com/en/prod/0,2877,ADM1024,00.html
 *
 * 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.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>

/*
 * Addresses to scan
 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.
 */

static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };

enum chips { lm87, adm1024 };

/*
 * The LM87 registers
 */

/* nr in 0..5 */
#define LM87_REG_IN(nr)			(0x20 + (nr))
#define LM87_REG_IN_MAX(nr)		(0x2B + (nr) * 2)
#define LM87_REG_IN_MIN(nr)		(0x2C + (nr) * 2)
/* nr in 0..1 */
#define LM87_REG_AIN(nr)		(0x28 + (nr))
#define LM87_REG_AIN_MIN(nr)		(0x1A + (nr))
#define LM87_REG_AIN_MAX(nr)		(0x3B + (nr))

static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };
static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };
static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };

#define LM87_REG_TEMP_HW_INT_LOCK	0x13
#define LM87_REG_TEMP_HW_EXT_LOCK	0x14
#define LM87_REG_TEMP_HW_INT		0x17
#define LM87_REG_TEMP_HW_EXT		0x18

/* nr in 0..1 */
#define LM87_REG_FAN(nr)		(0x28 + (nr))
#define LM87_REG_FAN_MIN(nr)		(0x3B + (nr))
#define LM87_REG_AOUT			0x19

#define LM87_REG_CONFIG			0x40
#define LM87_REG_CHANNEL_MODE		0x16
#define LM87_REG_VID_FAN_DIV		0x47
#define LM87_REG_VID4			0x49

#define LM87_REG_ALARMS1		0x41
#define LM87_REG_ALARMS2		0x42

#define LM87_REG_COMPANY_ID		0x3E
#define LM87_REG_REVISION		0x3F

/*
 * Conversions and various macros
 * The LM87 uses signed 8-bit values for temperatures.
 */

#define IN_FROM_REG(reg,scale)	(((reg) * (scale) + 96) / 192)
#define IN_TO_REG(val,scale)	((val) <= 0 ? 0 : \
				 (val) * 192 >= (scale) * 255 ? 255 : \
				 ((val) * 192 + (scale)/2) / (scale))

#define TEMP_FROM_REG(reg)	((reg) * 1000)
#define TEMP_TO_REG(val)	((val) <= -127500 ? -128 : \
				 (val) >= 126500 ? 127 : \
				 (((val) < 0 ? (val)-500 : (val)+500) / 1000))

#define FAN_FROM_REG(reg,div)	((reg) == 255 || (reg) == 0 ? 0 : \
				 (1350000 + (reg)*(div) / 2) / ((reg)*(div)))
#define FAN_TO_REG(val,div)	((val)*(div) * 255 <= 1350000 ? 255 : \
				 (1350000 + (val)*(div) / 2) / ((val)*(div)))

#define FAN_DIV_FROM_REG(reg)	(1 << (reg))

/* analog out is 9.80mV/LSB */
#define AOUT_FROM_REG(reg)	(((reg) * 98 + 5) / 10)
#define AOUT_TO_REG(val)	((val) <= 0 ? 0 : \
				 (val) >= 2500 ? 255 : \
				 ((val) * 10 + 49) / 98)

/* nr in 0..1 */
#define CHAN_NO_FAN(nr)		(1 << (nr))
#define CHAN_TEMP3		(1 << 2)
#define CHAN_VCC_5V		(1 << 3)
#define CHAN_NO_VID		(1 << 7)

/*
 * Functions declaration
 */

static int lm87_probe(struct i2c_client *client,
		      const struct i2c_device_id *id);
static int lm87_detect(struct i2c_client *new_client,
		       struct i2c_board_info *info);
static void lm87_init_client(struct i2c_client *client);
static int lm87_remove(struct i2c_client *client);
static struct lm87_data *lm87_update_device(struct device *dev);

/*
 * Driver data (common to all clients)
 */

static const struct i2c_device_id lm87_id[] = {
	{ "lm87", lm87 },
	{ "adm1024", adm1024 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, lm87_id);

static struct i2c_driver lm87_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name	= "lm87",
	},
	.probe		= lm87_probe,
	.remove		= lm87_remove,
	.id_table	= lm87_id,
	.detect		= lm87_detect,
	.address_list	= normal_i2c,
};

/*
 * Client data (each client gets its own)
 */

struct lm87_data {
	struct device *hwmon_dev;
	struct mutex update_lock;
	char valid; /* zero until following fields are valid */
	unsigned long last_updated; /* In jiffies */

	u8 channel;		/* register value */
	u8 config;		/* original register value */

	u8 in[8];		/* register value */
	u8 in_max[8];		/* register value */
	u8 in_min[8];		/* register value */
	u16 in_scale[8];

	s8 temp[3];		/* register value */
	s8 temp_high[3];	/* register value */
	s8 temp_low[3];		/* register value */
	s8 temp_crit_int;	/* min of two register values */
	s8 temp_crit_ext;	/* min of two register values */

	u8 fan[2];		/* register value */
	u8 fan_min[2];		/* register value */
	u8 fan_div[2];		/* register value, shifted right */
	u8 aout;		/* register value */

	u16 alarms;		/* register values, combined */
	u8 vid;			/* register values, combined */
	u8 vrm;
};

/*
 * Sysfs stuff
 */

static inline int lm87_read_value(struct i2c_client *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)
{
	return i2c_smbus_write_byte_data(client, reg, value);
}

#define show_in(offset) \
static ssize_t show_in##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%u\n", IN_FROM_REG(data->in[offset], \
		       data->in_scale[offset])); \
} \
static ssize_t show_in##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[offset], \
		       data->in_scale[offset])); \
} \
static ssize_t show_in##offset##_max(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[offset], \
		       data->in_scale[offset])); \
} \
static DEVICE_ATTR(in##offset##_input, S_IRUGO, \
		show_in##offset##_input, NULL);
show_in(0);
show_in(1);
show_in(2);
show_in(3);
show_in(4);
show_in(5);
show_in(6);
show_in(7);

static void set_in_min(struct device *dev, const char *buf, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);
	lm87_write_value(client, nr<6 ? LM87_REG_IN_MIN(nr) :
			 LM87_REG_AIN_MIN(nr-6), data->in_min[nr]);
	mutex_unlock(&data->update_lock);
}

static void set_in_max(struct device *dev, const char *buf, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);
	lm87_write_value(client, nr<6 ? LM87_REG_IN_MAX(nr) :
			 LM87_REG_AIN_MAX(nr-6), data->in_max[nr]);
	mutex_unlock(&data->update_lock);
}

#define set_in(offset) \
static ssize_t set_in##offset##_min(struct device *dev, struct device_attribute *attr, \
		const char *buf, size_t count) \
{ \
	set_in_min(dev, buf, offset); \
	return count; \
} \
static ssize_t set_in##offset##_max(struct device *dev, struct device_attribute *attr, \
		const char *buf, size_t count) \
{ \
	set_in_max(dev, buf, offset); \
	return count; \
} \
static DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
		show_in##offset##_min, set_in##offset##_min); \
static DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
		show_in##offset##_max, set_in##offset##_max);
set_in(0);
set_in(1);
set_in(2);
set_in(3);
set_in(4);
set_in(5);
set_in(6);
set_in(7);

#define show_temp(offset) \
static ssize_t show_temp##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[offset-1])); \
} \
static ssize_t show_temp##offset##_low(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_low[offset-1])); \
} \
static ssize_t show_temp##offset##_high(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_high[offset-1])); \
}\
static DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
		show_temp##offset##_input, NULL);
show_temp(1);
show_temp(2);
show_temp(3);

static void set_temp_low(struct device *dev, const char *buf, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->temp_low[nr] = TEMP_TO_REG(val);
	lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);
	mutex_unlock(&data->update_lock);
}

static void set_temp_high(struct device *dev, const char *buf, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->temp_high[nr] = TEMP_TO_REG(val);
	lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);
	mutex_unlock(&data->update_lock);
}

#define set_temp(offset) \
static ssize_t set_temp##offset##_low(struct device *dev, struct device_attribute *attr, \
		const char *buf, size_t count) \
{ \
	set_temp_low(dev, buf, offset-1); \
	return count; \
} \
static ssize_t set_temp##offset##_high(struct device *dev, struct device_attribute *attr, \
		const char *buf, size_t count) \
{ \
	set_temp_high(dev, buf, offset-1); \
	return count; \
} \
static DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
		show_temp##offset##_high, set_temp##offset##_high); \
static DEVICE_ATTR(temp##offset##_min, S_IRUGO | S_IWUSR, \
		show_temp##offset##_low, set_temp##offset##_low);
set_temp(1);
set_temp(2);
set_temp(3);

static ssize_t show_temp_crit_int(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));
}

static ssize_t show_temp_crit_ext(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));
}

static DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp_crit_int, NULL);
static DEVICE_ATTR(temp2_crit, S_IRUGO, show_temp_crit_ext, NULL);
static DEVICE_ATTR(temp3_crit, S_IRUGO, show_temp_crit_ext, NULL);

#define show_fan(offset) \
static ssize_t show_fan##offset##_input(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[offset-1], \
		       FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
} \
static ssize_t show_fan##offset##_min(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[offset-1], \
		       FAN_DIV_FROM_REG(data->fan_div[offset-1]))); \
} \
static ssize_t show_fan##offset##_div(struct device *dev, struct device_attribute *attr, char *buf) \
{ \
	struct lm87_data *data = lm87_update_device(dev); \
	return sprintf(buf, "%d\n", FAN_DIV_FROM_REG(data->fan_div[offset-1])); \
} \
static DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
		show_fan##offset##_input, NULL);
show_fan(1);
show_fan(2);

static void set_fan_min(struct device *dev, const char *buf, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->fan_min[nr] = FAN_TO_REG(val,
			    FAN_DIV_FROM_REG(data->fan_div[nr]));
	lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);
	mutex_unlock(&data->update_lock);
}

/* Note: we save and restore the fan minimum here, because its value is
   determined in part by the fan clock divider.  This follows the principle
   of least surprise; the user doesn't expect the fan minimum to change just
   because the divider changed. */
static ssize_t set_fan_div(struct device *dev, const char *buf,
		size_t count, int nr)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);
	unsigned long min;
	u8 reg;

	mutex_lock(&data->update_lock);
	min = FAN_FROM_REG(data->fan_min[nr],
			   FAN_DIV_FROM_REG(data->fan_div[nr]));

	switch (val) {
	case 1: data->fan_div[nr] = 0; break;
	case 2: data->fan_div[nr] = 1; break;
	case 4: data->fan_div[nr] = 2; break;
	case 8: data->fan_div[nr] = 3; break;
	default:
		mutex_unlock(&data->update_lock);
		return -EINVAL;
	}

	reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
	switch (nr) {
	case 0:
	    reg = (reg & 0xCF) | (data->fan_div[0] << 4);
	    break;
	case 1:
	    reg = (reg & 0x3F) | (data->fan_div[1] << 6);
	    break;
	}
	lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);

	data->fan_min[nr] = FAN_TO_REG(min, val);
	lm87_write_value(client, LM87_REG_FAN_MIN(nr),
			 data->fan_min[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

#define set_fan(offset) \
static ssize_t set_fan##offset##_min(struct device *dev, struct device_attribute *attr, const char *buf, \
		size_t count) \
{ \
	set_fan_min(dev, buf, offset-1); \
	return count; \
} \
static ssize_t set_fan##offset##_div(struct device *dev, struct device_attribute *attr, const char *buf, \
		size_t count) \
{ \
	return set_fan_div(dev, buf, count, offset-1); \
} \
static DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
		show_fan##offset##_min, set_fan##offset##_min); \
static DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
		show_fan##offset##_div, set_fan##offset##_div);
set_fan(1);
set_fan(2);

static ssize_t show_alarms(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", data->alarms);
}
static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

static ssize_t show_vid(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}
static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);

static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", data->vrm);
}
static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct lm87_data *data = dev_get_drvdata(dev);
	data->vrm = simple_strtoul(buf, NULL, 10);
	return count;
}
static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);

static ssize_t show_aout(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
}
static ssize_t set_aout(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);
	long val = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->aout = AOUT_TO_REG(val);
	lm87_write_value(client, LM87_REG_AOUT, data->aout);
	mutex_unlock(&data->update_lock);
	return count;
}
static DEVICE_ATTR(aout_output, S_IRUGO | S_IWUSR, show_aout, set_aout);

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct lm87_data *data = lm87_update_device(dev);
	int bitnr = to_sensor_dev_attr(attr)->index;
	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}
static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 14);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 15);

/*
 * Real code
 */

static struct attribute *lm87_attributes[] = {
	&dev_attr_in1_input.attr,
	&dev_attr_in1_min.attr,
	&dev_attr_in1_max.attr,
	&sensor_dev_attr_in1_alarm.dev_attr.attr,
	&dev_attr_in2_input.attr,
	&dev_attr_in2_min.attr,
	&dev_attr_in2_max.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,
	&dev_attr_in3_input.attr,
	&dev_attr_in3_min.attr,
	&dev_attr_in3_max.attr,
	&sensor_dev_attr_in3_alarm.dev_attr.attr,
	&dev_attr_in4_input.attr,
	&dev_attr_in4_min.attr,
	&dev_attr_in4_max.attr,
	&sensor_dev_attr_in4_alarm.dev_attr.attr,

	&dev_attr_temp1_input.attr,
	&dev_attr_temp1_max.attr,
	&dev_attr_temp1_min.attr,
	&dev_attr_temp1_crit.attr,
	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
	&dev_attr_temp2_input.attr,
	&dev_attr_temp2_max.attr,
	&dev_attr_temp2_min.attr,
	&dev_attr_temp2_crit.attr,
	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_fault.dev_attr.attr,

	&dev_attr_alarms.attr,
	&dev_attr_aout_output.attr,

	NULL
};

static const struct attribute_group lm87_group = {
	.attrs = lm87_attributes,
};

static struct attribute *lm87_attributes_opt[] = {
	&dev_attr_in6_input.attr,
	&dev_attr_in6_min.attr,
	&dev_attr_in6_max.attr,
	&sensor_dev_attr_in6_alarm.dev_attr.attr,

	&dev_attr_fan1_input.attr,
	&dev_attr_fan1_min.attr,
	&dev_attr_fan1_div.attr,
	&sensor_dev_attr_fan1_alarm.dev_attr.attr,

	&dev_attr_in7_input.attr,
	&dev_attr_in7_min.attr,
	&dev_attr_in7_max.attr,
	&sensor_dev_attr_in7_alarm.dev_attr.attr,

	&dev_attr_fan2_input.attr,
	&dev_attr_fan2_min.attr,
	&dev_attr_fan2_div.attr,
	&sensor_dev_attr_fan2_alarm.dev_attr.attr,

	&dev_attr_temp3_input.attr,
	&dev_attr_temp3_max.attr,
	&dev_attr_temp3_min.attr,
	&dev_attr_temp3_crit.attr,
	&sensor_dev_attr_temp3_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_fault.dev_attr.attr,

	&dev_attr_in0_input.attr,
	&dev_attr_in0_min.attr,
	&dev_attr_in0_max.attr,
	&sensor_dev_attr_in0_alarm.dev_attr.attr,
	&dev_attr_in5_input.attr,
	&dev_attr_in5_min.attr,
	&dev_attr_in5_max.attr,
	&sensor_dev_attr_in5_alarm.dev_attr.attr,

	&dev_attr_cpu0_vid.attr,
	&dev_attr_vrm.attr,

	NULL
};

static const struct attribute_group lm87_group_opt = {
	.attrs = lm87_attributes_opt,
};

/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm87_detect(struct i2c_client *new_client,
		       struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = new_client->adapter;
	const char *name;
	u8 cid, rev;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
		return -ENODEV;

	if (lm87_read_value(new_client, LM87_REG_CONFIG) & 0x80)
		return -ENODEV;

	/* Now, we do the remaining detection. */
	cid = lm87_read_value(new_client, LM87_REG_COMPANY_ID);
	rev = lm87_read_value(new_client, LM87_REG_REVISION);

	if (cid == 0x02			/* National Semiconductor */
	 && (rev >= 0x01 && rev <= 0x08))
		name = "lm87";
	else if (cid == 0x41		/* Analog Devices */
	      && (rev & 0xf0) == 0x10)
		name = "adm1024";
	else {
		dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",
			new_client->addr);
		return -ENODEV;
	}

	strlcpy(info->type, name, I2C_NAME_SIZE);

	return 0;
}

static int lm87_probe(struct i2c_client *new_client,
		      const struct i2c_device_id *id)
{
	struct lm87_data *data;
	int err;

	data = kzalloc(sizeof(struct lm87_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit;
	}

	i2c_set_clientdata(new_client, data);
	data->valid = 0;
	mutex_init(&data->update_lock);

	/* Initialize the LM87 chip */
	lm87_init_client(new_client);

	data->in_scale[0] = 2500;
	data->in_scale[1] = 2700;
	data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;
	data->in_scale[3] = 5000;
	data->in_scale[4] = 12000;
	data->in_scale[5] = 2700;
	data->in_scale[6] = 1875;
	data->in_scale[7] = 1875;

	/* Register sysfs hooks */
	if ((err = sysfs_create_group(&new_client->dev.kobj, &lm87_group)))
		goto exit_free;

	if (data->channel & CHAN_NO_FAN(0)) {
		if ((err = device_create_file(&new_client->dev,
					&dev_attr_in6_input))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_in6_min))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_in6_max))
		 || (err = device_create_file(&new_client->dev,
					&sensor_dev_attr_in6_alarm.dev_attr)))
			goto exit_remove;
	} else {
		if ((err = device_create_file(&new_client->dev,
					&dev_attr_fan1_input))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_fan1_min))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_fan1_div))
		 || (err = device_create_file(&new_client->dev,
					&sensor_dev_attr_fan1_alarm.dev_attr)))
			goto exit_remove;
	}

	if (data->channel & CHAN_NO_FAN(1)) {
		if ((err = device_create_file(&new_client->dev,
					&dev_attr_in7_input))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_in7_min))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_in7_max))
		 || (err = device_create_file(&new_client->dev,
					&sensor_dev_attr_in7_alarm.dev_attr)))
			goto exit_remove;
	} else {
		if ((err = device_create_file(&new_client->dev,
					&dev_attr_fan2_input))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_fan2_min))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_fan2_div))
		 || (err = device_create_file(&new_client->dev,
					&sensor_dev_attr_fan2_alarm.dev_attr)))
			goto exit_remove;
	}

	if (data->channel & CHAN_TEMP3) {
		if ((err = device_create_file(&new_client->dev,
					&dev_attr_temp3_input))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_temp3_max))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_temp3_min))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_temp3_crit))
		 || (err = device_create_file(&new_client->dev,
					&sensor_dev_attr_temp3_alarm.dev_attr))
		 || (err = device_create_file(&new_client->dev,
					&sensor_dev_attr_temp3_fault.dev_attr)))
			goto exit_remove;
	} else {
		if ((err = device_create_file(&new_client->dev,
					&dev_attr_in0_input))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_in0_min))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_in0_max))
		 || (err = device_create_file(&new_client->dev,
					&sensor_dev_attr_in0_alarm.dev_attr))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_in5_input))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_in5_min))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_in5_max))
		 || (err = device_create_file(&new_client->dev,
					&sensor_dev_attr_in5_alarm.dev_attr)))
			goto exit_remove;
	}

	if (!(data->channel & CHAN_NO_VID)) {
		data->vrm = vid_which_vrm();
		if ((err = device_create_file(&new_client->dev,
					&dev_attr_cpu0_vid))
		 || (err = device_create_file(&new_client->dev,
					&dev_attr_vrm)))
			goto exit_remove;
	}

	data->hwmon_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto exit_remove;
	}

	return 0;

exit_remove:
	sysfs_remove_group(&new_client->dev.kobj, &lm87_group);
	sysfs_remove_group(&new_client->dev.kobj, &lm87_group_opt);
exit_free:
	lm87_write_value(new_client, LM87_REG_CONFIG, data->config);
	kfree(data);
exit:
	return err;
}

static void lm87_init_client(struct i2c_client *client)
{
	struct lm87_data *data = i2c_get_clientdata(client);

	if (client->dev.platform_data) {
		data->channel = *(u8 *)client->dev.platform_data;
		lm87_write_value(client,
				 LM87_REG_CHANNEL_MODE, data->channel);
	} else {
		data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);
	}
	data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;

	if (!(data->config & 0x01)) {
		int i;

		/* Limits are left uninitialized after power-up */
		for (i = 1; i < 6; i++) {
			lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);
			lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);
		}
		for (i = 0; i < 2; i++) {
			lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);
			lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);
			lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);
			lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);
		}
		if (data->channel & CHAN_TEMP3) {
			lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);
			lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);
		} else {
			lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);
			lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);
		}
	}

	/* Make sure Start is set and INT#_Clear is clear */
	if ((data->config & 0x09) != 0x01)
		lm87_write_value(client, LM87_REG_CONFIG,
				 (data->config & 0x77) | 0x01);
}

static int lm87_remove(struct i2c_client *client)
{
	struct lm87_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &lm87_group);
	sysfs_remove_group(&client->dev.kobj, &lm87_group_opt);

	lm87_write_value(client, LM87_REG_CONFIG, data->config);
	kfree(data);
	return 0;
}

static struct lm87_data *lm87_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct lm87_data *data = i2c_get_clientdata(client);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
		int i, j;

		dev_dbg(&client->dev, "Updating data.\n");

		i = (data->channel & CHAN_TEMP3) ? 1 : 0;
		j = (data->channel & CHAN_TEMP3) ? 5 : 6;
		for (; i < j; i++) {
			data->in[i] = lm87_read_value(client,
				      LM87_REG_IN(i));
			data->in_min[i] = lm87_read_value(client,
					  LM87_REG_IN_MIN(i));
			data->in_max[i] = lm87_read_value(client,
					  LM87_REG_IN_MAX(i));
		}

		for (i = 0; i < 2; i++) {
			if (data->channel & CHAN_NO_FAN(i)) {
				data->in[6+i] = lm87_read_value(client,
						LM87_REG_AIN(i));
				data->in_max[6+i] = lm87_read_value(client,
						    LM87_REG_AIN_MAX(i));
				data->in_min[6+i] = lm87_read_value(client,
						    LM87_REG_AIN_MIN(i));

			} else {
				data->fan[i] = lm87_read_value(client,
					       LM87_REG_FAN(i));
				data->fan_min[i] = lm87_read_value(client,
						   LM87_REG_FAN_MIN(i));
			}
		}

		j = (data->channel & CHAN_TEMP3) ? 3 : 2;
		for (i = 0 ; i < j; i++) {
			data->temp[i] = lm87_read_value(client,
					LM87_REG_TEMP[i]);
			data->temp_high[i] = lm87_read_value(client,
					     LM87_REG_TEMP_HIGH[i]);
			data->temp_low[i] = lm87_read_value(client,
					    LM87_REG_TEMP_LOW[i]);
		}

		i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);
		j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);
		data->temp_crit_int = min(i, j);

		i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);
		j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);
		data->temp_crit_ext = min(i, j);

		i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);
		data->fan_div[0] = (i >> 4) & 0x03;
		data->fan_div[1] = (i >> 6) & 0x03;
		data->vid = (i & 0x0F)
			  | (lm87_read_value(client, LM87_REG_VID4) & 0x01)
			     << 4;

		data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)
			     | (lm87_read_value(client, LM87_REG_ALARMS2)
				<< 8);
		data->aout = lm87_read_value(client, LM87_REG_AOUT);

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static int __init sensors_lm87_init(void)
{
	return i2c_add_driver(&lm87_driver);
}

static void __exit sensors_lm87_exit(void)
{
	i2c_del_driver(&lm87_driver);
}

MODULE_AUTHOR("Jean Delvare <khali@linux-fr.org> and others");
MODULE_DESCRIPTION("LM87 driver");
MODULE_LICENSE("GPL");

module_init(sensors_lm87_init);
module_exit(sensors_lm87_exit);