smsc47m1.c 24.3 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
/*
 * smsc47m1.c - Part of lm_sensors, Linux kernel modules
 *		for hardware monitoring
 *
 * Supports the SMSC LPC47B27x, LPC47M10x, LPC47M112, LPC47M13x,
 * LPC47M14x, LPC47M15x, LPC47M192, LPC47M292 and LPC47M997
 * Super-I/O chips.
 *
 * Copyright (C) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
 * Copyright (C) 2004-2007 Jean Delvare <jdelvare@suse.de>
 * Ported to Linux 2.6 by Gabriele Gorla <gorlik@yahoo.com>
 *			and Jean Delvare
 *
 * 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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

static unsigned short force_id;
module_param(force_id, ushort, 0);
MODULE_PARM_DESC(force_id, "Override the detected device ID");

static struct platform_device *pdev;

#define DRVNAME "smsc47m1"
enum chips { smsc47m1, smsc47m2 };

/* Super-I/0 registers and commands */

#define REG	0x2e	/* The register to read/write */
#define VAL	0x2f	/* The value to read/write */

static inline void
superio_outb(int reg, int val)
{
	outb(reg, REG);
	outb(val, VAL);
}

static inline int
superio_inb(int reg)
{
	outb(reg, REG);
	return inb(VAL);
}

/* logical device for fans is 0x0A */
#define superio_select() superio_outb(0x07, 0x0A)

static inline void
superio_enter(void)
{
	outb(0x55, REG);
}

static inline void
superio_exit(void)
{
	outb(0xAA, REG);
}

#define SUPERIO_REG_ACT		0x30
#define SUPERIO_REG_BASE	0x60
#define SUPERIO_REG_DEVID	0x20
#define SUPERIO_REG_DEVREV	0x21

/* Logical device registers */

#define SMSC_EXTENT		0x80

/* nr is 0 or 1 in the macros below */
#define SMSC47M1_REG_ALARM		0x04
#define SMSC47M1_REG_TPIN(nr)		(0x34 - (nr))
#define SMSC47M1_REG_PPIN(nr)		(0x36 - (nr))
#define SMSC47M1_REG_FANDIV		0x58

static const u8 SMSC47M1_REG_FAN[3]		= { 0x59, 0x5a, 0x6b };
static const u8 SMSC47M1_REG_FAN_PRELOAD[3]	= { 0x5b, 0x5c, 0x6c };
static const u8 SMSC47M1_REG_PWM[3]		= { 0x56, 0x57, 0x69 };

#define SMSC47M2_REG_ALARM6		0x09
#define SMSC47M2_REG_TPIN1		0x38
#define SMSC47M2_REG_TPIN2		0x37
#define SMSC47M2_REG_TPIN3		0x2d
#define SMSC47M2_REG_PPIN3		0x2c
#define SMSC47M2_REG_FANDIV3		0x6a

#define MIN_FROM_REG(reg, div)		((reg) >= 192 ? 0 : \
					 983040 / ((192 - (reg)) * (div)))
#define FAN_FROM_REG(reg, div, preload)	((reg) <= (preload) || (reg) == 255 ? \
					 0 : \
					 983040 / (((reg) - (preload)) * (div)))
#define DIV_FROM_REG(reg)		(1 << (reg))
#define PWM_FROM_REG(reg)		(((reg) & 0x7E) << 1)
#define PWM_EN_FROM_REG(reg)		((~(reg)) & 0x01)
#define PWM_TO_REG(reg)			(((reg) >> 1) & 0x7E)

struct smsc47m1_data {
	unsigned short addr;
	const char *name;
	enum chips type;
	struct device *hwmon_dev;

	struct mutex update_lock;
	unsigned long last_updated;	/* In jiffies */

	u8 fan[3];		/* Register value */
	u8 fan_preload[3];	/* Register value */
	u8 fan_div[3];		/* Register encoding, shifted right */
	u8 alarms;		/* Register encoding */
	u8 pwm[3];		/* Register value (bit 0 is disable) */
};

struct smsc47m1_sio_data {
	enum chips type;
	u8 activate;		/* Remember initial device state */
};

static inline int smsc47m1_read_value(struct smsc47m1_data *data, u8 reg)
{
	return inb_p(data->addr + reg);
}

static inline void smsc47m1_write_value(struct smsc47m1_data *data, u8 reg,
		u8 value)
{
	outb_p(value, data->addr + reg);
}

static struct smsc47m1_data *smsc47m1_update_device(struct device *dev,
		int init)
{
	struct smsc47m1_data *data = dev_get_drvdata(dev);

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2) || init) {
		int i, fan_nr;
		fan_nr = data->type == smsc47m2 ? 3 : 2;

		for (i = 0; i < fan_nr; i++) {
			data->fan[i] = smsc47m1_read_value(data,
				       SMSC47M1_REG_FAN[i]);
			data->fan_preload[i] = smsc47m1_read_value(data,
					       SMSC47M1_REG_FAN_PRELOAD[i]);
			data->pwm[i] = smsc47m1_read_value(data,
				       SMSC47M1_REG_PWM[i]);
		}

		i = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV);
		data->fan_div[0] = (i >> 4) & 0x03;
		data->fan_div[1] = i >> 6;

		data->alarms = smsc47m1_read_value(data,
			       SMSC47M1_REG_ALARM) >> 6;
		/* Clear alarms if needed */
		if (data->alarms)
			smsc47m1_write_value(data, SMSC47M1_REG_ALARM, 0xC0);

		if (fan_nr >= 3) {
			data->fan_div[2] = (smsc47m1_read_value(data,
					    SMSC47M2_REG_FANDIV3) >> 4) & 0x03;
			data->alarms |= (smsc47m1_read_value(data,
					 SMSC47M2_REG_ALARM6) & 0x40) >> 4;
			/* Clear alarm if needed */
			if (data->alarms & 0x04)
				smsc47m1_write_value(data,
						     SMSC47M2_REG_ALARM6,
						     0x40);
		}

		data->last_updated = jiffies;
	}

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

static ssize_t get_fan(struct device *dev, struct device_attribute
		       *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
	int nr = attr->index;
	/*
	 * This chip (stupidly) stops monitoring fan speed if PWM is
	 * enabled and duty cycle is 0%. This is fine if the monitoring
	 * and control concern the same fan, but troublesome if they are
	 * not (which could as well happen).
	 */
	int rpm = (data->pwm[nr] & 0x7F) == 0x00 ? 0 :
		  FAN_FROM_REG(data->fan[nr],
			       DIV_FROM_REG(data->fan_div[nr]),
			       data->fan_preload[nr]);
	return sprintf(buf, "%d\n", rpm);
}

static ssize_t get_fan_min(struct device *dev, struct device_attribute
			   *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
	int nr = attr->index;
	int rpm = MIN_FROM_REG(data->fan_preload[nr],
			       DIV_FROM_REG(data->fan_div[nr]));
	return sprintf(buf, "%d\n", rpm);
}

static ssize_t get_fan_div(struct device *dev, struct device_attribute
			   *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
	return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
}

static ssize_t get_fan_alarm(struct device *dev, struct device_attribute
			     *devattr, char *buf)
{
	int bitnr = to_sensor_dev_attr(devattr)->index;
	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}

static ssize_t get_pwm(struct device *dev, struct device_attribute
		       *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
	return sprintf(buf, "%d\n", PWM_FROM_REG(data->pwm[attr->index]));
}

static ssize_t get_pwm_en(struct device *dev, struct device_attribute
			  *devattr, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
	return sprintf(buf, "%d\n", PWM_EN_FROM_REG(data->pwm[attr->index]));
}

static ssize_t get_alarms(struct device *dev, struct device_attribute
			  *devattr, char *buf)
{
	struct smsc47m1_data *data = smsc47m1_update_device(dev, 0);
	return sprintf(buf, "%d\n", data->alarms);
}

static ssize_t set_fan_min(struct device *dev, struct device_attribute
			   *devattr, const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47m1_data *data = dev_get_drvdata(dev);
	int nr = attr->index;
	long rpmdiv;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	mutex_lock(&data->update_lock);
	rpmdiv = val * DIV_FROM_REG(data->fan_div[nr]);

	if (983040 > 192 * rpmdiv || 2 * rpmdiv > 983040) {
		mutex_unlock(&data->update_lock);
		return -EINVAL;
	}

	data->fan_preload[nr] = 192 - ((983040 + rpmdiv / 2) / rpmdiv);
	smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
			     data->fan_preload[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

/*
 * 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, struct device_attribute
			   *devattr, const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47m1_data *data = dev_get_drvdata(dev);
	int nr = attr->index;
	long new_div;
	int err;
	long tmp;
	u8 old_div = DIV_FROM_REG(data->fan_div[nr]);

	err = kstrtol(buf, 10, &new_div);
	if (err)
		return err;

	if (new_div == old_div) /* No change */
		return count;

	mutex_lock(&data->update_lock);
	switch (new_div) {
	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;
	}

	switch (nr) {
	case 0:
	case 1:
		tmp = smsc47m1_read_value(data, SMSC47M1_REG_FANDIV)
		      & ~(0x03 << (4 + 2 * nr));
		tmp |= data->fan_div[nr] << (4 + 2 * nr);
		smsc47m1_write_value(data, SMSC47M1_REG_FANDIV, tmp);
		break;
	case 2:
		tmp = smsc47m1_read_value(data, SMSC47M2_REG_FANDIV3) & 0xCF;
		tmp |= data->fan_div[2] << 4;
		smsc47m1_write_value(data, SMSC47M2_REG_FANDIV3, tmp);
		break;
	}

	/* Preserve fan min */
	tmp = 192 - (old_div * (192 - data->fan_preload[nr])
		     + new_div / 2) / new_div;
	data->fan_preload[nr] = clamp_val(tmp, 0, 191);
	smsc47m1_write_value(data, SMSC47M1_REG_FAN_PRELOAD[nr],
			     data->fan_preload[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t set_pwm(struct device *dev, struct device_attribute
		       *devattr, const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47m1_data *data = dev_get_drvdata(dev);
	int nr = attr->index;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err)
		return err;

	if (val < 0 || val > 255)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->pwm[nr] &= 0x81; /* Preserve additional bits */
	data->pwm[nr] |= PWM_TO_REG(val);
	smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
			     data->pwm[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t set_pwm_en(struct device *dev, struct device_attribute
			  *devattr, const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct smsc47m1_data *data = dev_get_drvdata(dev);
	int nr = attr->index;
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err)
		return err;

	if (val > 1)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->pwm[nr] &= 0xFE; /* preserve the other bits */
	data->pwm[nr] |= !val;
	smsc47m1_write_value(data, SMSC47M1_REG_PWM[nr],
			     data->pwm[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

#define fan_present(offset)						\
static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, get_fan,	\
		NULL, offset - 1);					\
static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,		\
		get_fan_min, set_fan_min, offset - 1);			\
static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,		\
		get_fan_div, set_fan_div, offset - 1);			\
static SENSOR_DEVICE_ATTR(fan##offset##_alarm, S_IRUGO, get_fan_alarm,	\
		NULL, offset - 1);					\
static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR,		\
		get_pwm, set_pwm, offset - 1);				\
static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR,	\
		get_pwm_en, set_pwm_en, offset - 1)

fan_present(1);
fan_present(2);
fan_present(3);

static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);

static ssize_t show_name(struct device *dev, struct device_attribute
			 *devattr, char *buf)
{
	struct smsc47m1_data *data = dev_get_drvdata(dev);

	return sprintf(buf, "%s\n", data->name);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static struct attribute *smsc47m1_attributes_fan1[] = {
	&sensor_dev_attr_fan1_input.dev_attr.attr,
	&sensor_dev_attr_fan1_min.dev_attr.attr,
	&sensor_dev_attr_fan1_div.dev_attr.attr,
	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group smsc47m1_group_fan1 = {
	.attrs = smsc47m1_attributes_fan1,
};

static struct attribute *smsc47m1_attributes_fan2[] = {
	&sensor_dev_attr_fan2_input.dev_attr.attr,
	&sensor_dev_attr_fan2_min.dev_attr.attr,
	&sensor_dev_attr_fan2_div.dev_attr.attr,
	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group smsc47m1_group_fan2 = {
	.attrs = smsc47m1_attributes_fan2,
};

static struct attribute *smsc47m1_attributes_fan3[] = {
	&sensor_dev_attr_fan3_input.dev_attr.attr,
	&sensor_dev_attr_fan3_min.dev_attr.attr,
	&sensor_dev_attr_fan3_div.dev_attr.attr,
	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
	NULL
};

static const struct attribute_group smsc47m1_group_fan3 = {
	.attrs = smsc47m1_attributes_fan3,
};

static struct attribute *smsc47m1_attributes_pwm1[] = {
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&sensor_dev_attr_pwm1_enable.dev_attr.attr,
	NULL
};

static const struct attribute_group smsc47m1_group_pwm1 = {
	.attrs = smsc47m1_attributes_pwm1,
};

static struct attribute *smsc47m1_attributes_pwm2[] = {
	&sensor_dev_attr_pwm2.dev_attr.attr,
	&sensor_dev_attr_pwm2_enable.dev_attr.attr,
	NULL
};

static const struct attribute_group smsc47m1_group_pwm2 = {
	.attrs = smsc47m1_attributes_pwm2,
};

static struct attribute *smsc47m1_attributes_pwm3[] = {
	&sensor_dev_attr_pwm3.dev_attr.attr,
	&sensor_dev_attr_pwm3_enable.dev_attr.attr,
	NULL
};

static const struct attribute_group smsc47m1_group_pwm3 = {
	.attrs = smsc47m1_attributes_pwm3,
};

static struct attribute *smsc47m1_attributes[] = {
	&dev_attr_alarms.attr,
	&dev_attr_name.attr,
	NULL
};

static const struct attribute_group smsc47m1_group = {
	.attrs = smsc47m1_attributes,
};

static int __init smsc47m1_find(struct smsc47m1_sio_data *sio_data)
{
	u8 val;
	unsigned short addr;

	superio_enter();
	val = force_id ? force_id : superio_inb(SUPERIO_REG_DEVID);

	/*
	 * SMSC LPC47M10x/LPC47M112/LPC47M13x (device id 0x59), LPC47M14x
	 * (device id 0x5F) and LPC47B27x (device id 0x51) have fan control.
	 * The LPC47M15x and LPC47M192 chips "with hardware monitoring block"
	 * can do much more besides (device id 0x60).
	 * The LPC47M997 is undocumented, but seems to be compatible with
	 * the LPC47M192, and has the same device id.
	 * The LPC47M292 (device id 0x6B) is somewhat compatible, but it
	 * supports a 3rd fan, and the pin configuration registers are
	 * unfortunately different.
	 * The LPC47M233 has the same device id (0x6B) but is not compatible.
	 * We check the high bit of the device revision register to
	 * differentiate them.
	 */
	switch (val) {
	case 0x51:
		pr_info("Found SMSC LPC47B27x\n");
		sio_data->type = smsc47m1;
		break;
	case 0x59:
		pr_info("Found SMSC LPC47M10x/LPC47M112/LPC47M13x\n");
		sio_data->type = smsc47m1;
		break;
	case 0x5F:
		pr_info("Found SMSC LPC47M14x\n");
		sio_data->type = smsc47m1;
		break;
	case 0x60:
		pr_info("Found SMSC LPC47M15x/LPC47M192/LPC47M997\n");
		sio_data->type = smsc47m1;
		break;
	case 0x6B:
		if (superio_inb(SUPERIO_REG_DEVREV) & 0x80) {
			pr_debug("Found SMSC LPC47M233, unsupported\n");
			superio_exit();
			return -ENODEV;
		}

		pr_info("Found SMSC LPC47M292\n");
		sio_data->type = smsc47m2;
		break;
	default:
		superio_exit();
		return -ENODEV;
	}

	superio_select();
	addr = (superio_inb(SUPERIO_REG_BASE) << 8)
	      |  superio_inb(SUPERIO_REG_BASE + 1);
	if (addr == 0) {
		pr_info("Device address not set, will not use\n");
		superio_exit();
		return -ENODEV;
	}

	/*
	 * Enable only if address is set (needed at least on the
	 * Compaq Presario S4000NX)
	 */
	sio_data->activate = superio_inb(SUPERIO_REG_ACT);
	if ((sio_data->activate & 0x01) == 0) {
		pr_info("Enabling device\n");
		superio_outb(SUPERIO_REG_ACT, sio_data->activate | 0x01);
	}

	superio_exit();
	return addr;
}

/* Restore device to its initial state */
static void smsc47m1_restore(const struct smsc47m1_sio_data *sio_data)
{
	if ((sio_data->activate & 0x01) == 0) {
		superio_enter();
		superio_select();

		pr_info("Disabling device\n");
		superio_outb(SUPERIO_REG_ACT, sio_data->activate);

		superio_exit();
	}
}

#define CHECK		1
#define REQUEST		2

/*
 * This function can be used to:
 *  - test for resource conflicts with ACPI
 *  - request the resources
 * We only allocate the I/O ports we really need, to minimize the risk of
 * conflicts with ACPI or with other drivers.
 */
static int __init smsc47m1_handle_resources(unsigned short address,
					    enum chips type, int action,
					    struct device *dev)
{
	static const u8 ports_m1[] = {
		/* register, region length */
		0x04, 1,
		0x33, 4,
		0x56, 7,
	};

	static const u8 ports_m2[] = {
		/* register, region length */
		0x04, 1,
		0x09, 1,
		0x2c, 2,
		0x35, 4,
		0x56, 7,
		0x69, 4,
	};

	int i, ports_size, err;
	const u8 *ports;

	switch (type) {
	case smsc47m1:
	default:
		ports = ports_m1;
		ports_size = ARRAY_SIZE(ports_m1);
		break;
	case smsc47m2:
		ports = ports_m2;
		ports_size = ARRAY_SIZE(ports_m2);
		break;
	}

	for (i = 0; i + 1 < ports_size; i += 2) {
		unsigned short start = address + ports[i];
		unsigned short len = ports[i + 1];

		switch (action) {
		case CHECK:
			/* Only check for conflicts */
			err = acpi_check_region(start, len, DRVNAME);
			if (err)
				return err;
			break;
		case REQUEST:
			/* Request the resources */
			if (!devm_request_region(dev, start, len, DRVNAME)) {
				dev_err(dev,
					"Region 0x%hx-0x%hx already in use!\n",
					start, start + len);
				return -EBUSY;
			}
			break;
		}
	}

	return 0;
}

static void smsc47m1_remove_files(struct device *dev)
{
	sysfs_remove_group(&dev->kobj, &smsc47m1_group);
	sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan1);
	sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan2);
	sysfs_remove_group(&dev->kobj, &smsc47m1_group_fan3);
	sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm1);
	sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm2);
	sysfs_remove_group(&dev->kobj, &smsc47m1_group_pwm3);
}

static int __init smsc47m1_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct smsc47m1_sio_data *sio_data = dev_get_platdata(dev);
	struct smsc47m1_data *data;
	struct resource *res;
	int err;
	int fan1, fan2, fan3, pwm1, pwm2, pwm3;

	static const char * const names[] = {
		"smsc47m1",
		"smsc47m2",
	};

	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	err = smsc47m1_handle_resources(res->start, sio_data->type,
					REQUEST, dev);
	if (err < 0)
		return err;

	data = devm_kzalloc(dev, sizeof(struct smsc47m1_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->addr = res->start;
	data->type = sio_data->type;
	data->name = names[sio_data->type];
	mutex_init(&data->update_lock);
	platform_set_drvdata(pdev, data);

	/*
	 * If no function is properly configured, there's no point in
	 * actually registering the chip.
	 */
	pwm1 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(0)) & 0x05)
	       == 0x04;
	pwm2 = (smsc47m1_read_value(data, SMSC47M1_REG_PPIN(1)) & 0x05)
	       == 0x04;
	if (data->type == smsc47m2) {
		fan1 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN1)
			& 0x0d) == 0x09;
		fan2 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN2)
			& 0x0d) == 0x09;
		fan3 = (smsc47m1_read_value(data, SMSC47M2_REG_TPIN3)
			& 0x0d) == 0x0d;
		pwm3 = (smsc47m1_read_value(data, SMSC47M2_REG_PPIN3)
			& 0x0d) == 0x08;
	} else {
		fan1 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(0))
			& 0x05) == 0x05;
		fan2 = (smsc47m1_read_value(data, SMSC47M1_REG_TPIN(1))
			& 0x05) == 0x05;
		fan3 = 0;
		pwm3 = 0;
	}
	if (!(fan1 || fan2 || fan3 || pwm1 || pwm2 || pwm3)) {
		dev_warn(dev, "Device not configured, will not use\n");
		return -ENODEV;
	}

	/*
	 * Some values (fan min, clock dividers, pwm registers) may be
	 * needed before any update is triggered, so we better read them
	 * at least once here. We don't usually do it that way, but in
	 * this particular case, manually reading 5 registers out of 8
	 * doesn't make much sense and we're better using the existing
	 * function.
	 */
	smsc47m1_update_device(dev, 1);

	/* Register sysfs hooks */
	if (fan1) {
		err = sysfs_create_group(&dev->kobj,
					 &smsc47m1_group_fan1);
		if (err)
			goto error_remove_files;
	} else
		dev_dbg(dev, "Fan 1 not enabled by hardware, skipping\n");

	if (fan2) {
		err = sysfs_create_group(&dev->kobj,
					 &smsc47m1_group_fan2);
		if (err)
			goto error_remove_files;
	} else
		dev_dbg(dev, "Fan 2 not enabled by hardware, skipping\n");

	if (fan3) {
		err = sysfs_create_group(&dev->kobj,
					 &smsc47m1_group_fan3);
		if (err)
			goto error_remove_files;
	} else if (data->type == smsc47m2)
		dev_dbg(dev, "Fan 3 not enabled by hardware, skipping\n");

	if (pwm1) {
		err = sysfs_create_group(&dev->kobj,
					 &smsc47m1_group_pwm1);
		if (err)
			goto error_remove_files;
	} else
		dev_dbg(dev, "PWM 1 not enabled by hardware, skipping\n");

	if (pwm2) {
		err = sysfs_create_group(&dev->kobj,
					 &smsc47m1_group_pwm2);
		if (err)
			goto error_remove_files;
	} else
		dev_dbg(dev, "PWM 2 not enabled by hardware, skipping\n");

	if (pwm3) {
		err = sysfs_create_group(&dev->kobj,
					 &smsc47m1_group_pwm3);
		if (err)
			goto error_remove_files;
	} else if (data->type == smsc47m2)
		dev_dbg(dev, "PWM 3 not enabled by hardware, skipping\n");

	err = sysfs_create_group(&dev->kobj, &smsc47m1_group);
	if (err)
		goto error_remove_files;

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

	return 0;

error_remove_files:
	smsc47m1_remove_files(dev);
	return err;
}

static int __exit smsc47m1_remove(struct platform_device *pdev)
{
	struct smsc47m1_data *data = platform_get_drvdata(pdev);

	hwmon_device_unregister(data->hwmon_dev);
	smsc47m1_remove_files(&pdev->dev);

	return 0;
}

static struct platform_driver smsc47m1_driver = {
	.driver = {
		.name	= DRVNAME,
	},
	.remove		= __exit_p(smsc47m1_remove),
};

static int __init smsc47m1_device_add(unsigned short address,
				      const struct smsc47m1_sio_data *sio_data)
{
	struct resource res = {
		.start	= address,
		.end	= address + SMSC_EXTENT - 1,
		.name	= DRVNAME,
		.flags	= IORESOURCE_IO,
	};
	int err;

	err = smsc47m1_handle_resources(address, sio_data->type, CHECK, NULL);
	if (err)
		goto exit;

	pdev = platform_device_alloc(DRVNAME, address);
	if (!pdev) {
		err = -ENOMEM;
		pr_err("Device allocation failed\n");
		goto exit;
	}

	err = platform_device_add_resources(pdev, &res, 1);
	if (err) {
		pr_err("Device resource addition failed (%d)\n", err);
		goto exit_device_put;
	}

	err = platform_device_add_data(pdev, sio_data,
				       sizeof(struct smsc47m1_sio_data));
	if (err) {
		pr_err("Platform data allocation failed\n");
		goto exit_device_put;
	}

	err = platform_device_add(pdev);
	if (err) {
		pr_err("Device addition failed (%d)\n", err);
		goto exit_device_put;
	}

	return 0;

exit_device_put:
	platform_device_put(pdev);
exit:
	return err;
}

static int __init sm_smsc47m1_init(void)
{
	int err;
	unsigned short address;
	struct smsc47m1_sio_data sio_data;

	err = smsc47m1_find(&sio_data);
	if (err < 0)
		return err;
	address = err;

	/* Sets global pdev as a side effect */
	err = smsc47m1_device_add(address, &sio_data);
	if (err)
		return err;

	err = platform_driver_probe(&smsc47m1_driver, smsc47m1_probe);
	if (err)
		goto exit_device;

	return 0;

exit_device:
	platform_device_unregister(pdev);
	smsc47m1_restore(&sio_data);
	return err;
}

static void __exit sm_smsc47m1_exit(void)
{
	platform_driver_unregister(&smsc47m1_driver);
	smsc47m1_restore(dev_get_platdata(&pdev->dev));
	platform_device_unregister(pdev);
}

MODULE_AUTHOR("Mark D. Studebaker <mdsxyz123@yahoo.com>");
MODULE_DESCRIPTION("SMSC LPC47M1xx fan sensors driver");
MODULE_LICENSE("GPL");

module_init(sm_smsc47m1_init);
module_exit(sm_smsc47m1_exit);