/*
 * nct6775 - Driver for the hardware monitoring functionality of
 *	       Nuvoton NCT677x Super-I/O chips
 *
 * Copyright (C) 2012  Guenter Roeck <linux@roeck-us.net>
 *
 * Derived from w83627ehf driver
 * Copyright (C) 2005-2012  Jean Delvare <jdelvare@suse.de>
 * Copyright (C) 2006  Yuan Mu (Winbond),
 *		       Rudolf Marek <r.marek@assembler.cz>
 *		       David Hubbard <david.c.hubbard@gmail.com>
 *		       Daniel J Blueman <daniel.blueman@gmail.com>
 * Copyright (C) 2010  Sheng-Yuan Huang (Nuvoton) (PS00)
 *
 * Shamelessly ripped from the w83627hf driver
 * Copyright (C) 2003  Mark Studebaker
 *
 * 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.
 *
 *
 * Supports the following chips:
 *
 * Chip        #vin    #fan    #pwm    #temp  chip IDs       man ID
 * nct6106d     9      3       3       6+3    0xc450 0xc1    0x5ca3
 * nct6775f     9      4       3       6+3    0xb470 0xc1    0x5ca3
 * nct6776f     9      5       3       6+3    0xc330 0xc1    0x5ca3
 * nct6779d    15      5       5       2+6    0xc560 0xc1    0x5ca3
 * nct6791d    15      6       6       2+6    0xc800 0xc1    0x5ca3
 *
 * #temp lists the number of monitored temperature sources (first value) plus
 * the number of directly connectable temperature sensors (second value).
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/platform_device.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/hwmon-vid.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/acpi.h>
#include <linux/io.h>
#include <linux/nospec.h>
#include "lm75.h"

#define USE_ALTERNATE

enum kinds { nct6106, nct6775, nct6776, nct6779, nct6791 };

/* used to set data->name = nct6775_device_names[data->sio_kind] */
static const char * const nct6775_device_names[] = {
	"nct6106",
	"nct6775",
	"nct6776",
	"nct6779",
	"nct6791",
};

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

static unsigned short fan_debounce;
module_param(fan_debounce, ushort, 0);
MODULE_PARM_DESC(fan_debounce, "Enable debouncing for fan RPM signal");

#define DRVNAME "nct6775"

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

#define NCT6775_LD_ACPI		0x0a
#define NCT6775_LD_HWM		0x0b
#define NCT6775_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_NCT6106_ID		0xc450
#define SIO_NCT6775_ID		0xb470
#define SIO_NCT6776_ID		0xc330
#define SIO_NCT6779_ID		0xc560
#define SIO_NCT6791_ID		0xc800
#define SIO_ID_MASK		0xFFF0

enum pwm_enable { off, manual, thermal_cruise, speed_cruise, sf3, sf4 };

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		5
#define IOREGION_LENGTH		2
#define ADDR_REG_OFFSET		0
#define DATA_REG_OFFSET		1

#define NCT6775_REG_BANK	0x4E
#define NCT6775_REG_CONFIG	0x40

/*
 * Not currently used:
 * REG_MAN_ID has the value 0x5ca3 for all supported chips.
 * REG_CHIP_ID == 0x88/0xa1/0xc1 depending on chip model.
 * REG_MAN_ID is at port 0x4f
 * REG_CHIP_ID is at port 0x58
 */

#define NUM_TEMP	10	/* Max number of temp attribute sets w/ limits*/
#define NUM_TEMP_FIXED	6	/* Max number of fixed temp attribute sets */

#define NUM_REG_ALARM	7	/* Max number of alarm registers */
#define NUM_REG_BEEP	5	/* Max number of beep registers */

#define NUM_FAN		6

/* Common and NCT6775 specific data */

/* Voltage min/max registers for nr=7..14 are in bank 5 */

static const u16 NCT6775_REG_IN_MAX[] = {
	0x2b, 0x2d, 0x2f, 0x31, 0x33, 0x35, 0x37, 0x554, 0x556, 0x558, 0x55a,
	0x55c, 0x55e, 0x560, 0x562 };
static const u16 NCT6775_REG_IN_MIN[] = {
	0x2c, 0x2e, 0x30, 0x32, 0x34, 0x36, 0x38, 0x555, 0x557, 0x559, 0x55b,
	0x55d, 0x55f, 0x561, 0x563 };
static const u16 NCT6775_REG_IN[] = {
	0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x550, 0x551, 0x552
};

#define NCT6775_REG_VBAT		0x5D
#define NCT6775_REG_DIODE		0x5E
#define NCT6775_DIODE_MASK		0x02

#define NCT6775_REG_FANDIV1		0x506
#define NCT6775_REG_FANDIV2		0x507

#define NCT6775_REG_CR_FAN_DEBOUNCE	0xf0

static const u16 NCT6775_REG_ALARM[NUM_REG_ALARM] = { 0x459, 0x45A, 0x45B };

/* 0..15 voltages, 16..23 fans, 24..29 temperatures, 30..31 intrusion */

static const s8 NCT6775_ALARM_BITS[] = {
	0, 1, 2, 3, 8, 21, 20, 16,	/* in0.. in7 */
	17, -1, -1, -1, -1, -1, -1,	/* in8..in14 */
	-1,				/* unused */
	6, 7, 11, -1, -1,		/* fan1..fan5 */
	-1, -1, -1,			/* unused */
	4, 5, 13, -1, -1, -1,		/* temp1..temp6 */
	12, -1 };			/* intrusion0, intrusion1 */

#define FAN_ALARM_BASE		16
#define TEMP_ALARM_BASE		24
#define INTRUSION_ALARM_BASE	30

static const u16 NCT6775_REG_BEEP[NUM_REG_BEEP] = { 0x56, 0x57, 0x453, 0x4e };

/*
 * 0..14 voltages, 15 global beep enable, 16..23 fans, 24..29 temperatures,
 * 30..31 intrusion
 */
static const s8 NCT6775_BEEP_BITS[] = {
	0, 1, 2, 3, 8, 9, 10, 16,	/* in0.. in7 */
	17, -1, -1, -1, -1, -1, -1,	/* in8..in14 */
	21,				/* global beep enable */
	6, 7, 11, 28, -1,		/* fan1..fan5 */
	-1, -1, -1,			/* unused */
	4, 5, 13, -1, -1, -1,		/* temp1..temp6 */
	12, -1 };			/* intrusion0, intrusion1 */

#define BEEP_ENABLE_BASE		15

static const u8 NCT6775_REG_CR_CASEOPEN_CLR[] = { 0xe6, 0xee };
static const u8 NCT6775_CR_CASEOPEN_CLR_MASK[] = { 0x20, 0x01 };

/* DC or PWM output fan configuration */
static const u8 NCT6775_REG_PWM_MODE[] = { 0x04, 0x04, 0x12 };
static const u8 NCT6775_PWM_MODE_MASK[] = { 0x01, 0x02, 0x01 };

/* Advanced Fan control, some values are common for all fans */

static const u16 NCT6775_REG_TARGET[] = {
	0x101, 0x201, 0x301, 0x801, 0x901, 0xa01 };
static const u16 NCT6775_REG_FAN_MODE[] = {
	0x102, 0x202, 0x302, 0x802, 0x902, 0xa02 };
static const u16 NCT6775_REG_FAN_STEP_DOWN_TIME[] = {
	0x103, 0x203, 0x303, 0x803, 0x903, 0xa03 };
static const u16 NCT6775_REG_FAN_STEP_UP_TIME[] = {
	0x104, 0x204, 0x304, 0x804, 0x904, 0xa04 };
static const u16 NCT6775_REG_FAN_STOP_OUTPUT[] = {
	0x105, 0x205, 0x305, 0x805, 0x905, 0xa05 };
static const u16 NCT6775_REG_FAN_START_OUTPUT[] = {
	0x106, 0x206, 0x306, 0x806, 0x906, 0xa06 };
static const u16 NCT6775_REG_FAN_MAX_OUTPUT[] = { 0x10a, 0x20a, 0x30a };
static const u16 NCT6775_REG_FAN_STEP_OUTPUT[] = { 0x10b, 0x20b, 0x30b };

static const u16 NCT6775_REG_FAN_STOP_TIME[] = {
	0x107, 0x207, 0x307, 0x807, 0x907, 0xa07 };
static const u16 NCT6775_REG_PWM[] = {
	0x109, 0x209, 0x309, 0x809, 0x909, 0xa09 };
static const u16 NCT6775_REG_PWM_READ[] = {
	0x01, 0x03, 0x11, 0x13, 0x15, 0xa09 };

static const u16 NCT6775_REG_FAN[] = { 0x630, 0x632, 0x634, 0x636, 0x638 };
static const u16 NCT6775_REG_FAN_MIN[] = { 0x3b, 0x3c, 0x3d };
static const u16 NCT6775_REG_FAN_PULSES[NUM_FAN] = {
	0x641, 0x642, 0x643, 0x644 };
static const u16 NCT6775_FAN_PULSE_SHIFT[NUM_FAN] = { };

static const u16 NCT6775_REG_TEMP[] = {
	0x27, 0x150, 0x250, 0x62b, 0x62c, 0x62d };

static const u16 NCT6775_REG_TEMP_MON[] = { 0x73, 0x75, 0x77 };

static const u16 NCT6775_REG_TEMP_CONFIG[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
	0, 0x152, 0x252, 0x628, 0x629, 0x62A };
static const u16 NCT6775_REG_TEMP_HYST[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
	0x3a, 0x153, 0x253, 0x673, 0x678, 0x67D };
static const u16 NCT6775_REG_TEMP_OVER[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
	0x39, 0x155, 0x255, 0x672, 0x677, 0x67C };

static const u16 NCT6775_REG_TEMP_SOURCE[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
	0x621, 0x622, 0x623, 0x624, 0x625, 0x626 };

static const u16 NCT6775_REG_TEMP_SEL[] = {
	0x100, 0x200, 0x300, 0x800, 0x900, 0xa00 };

static const u16 NCT6775_REG_WEIGHT_TEMP_SEL[] = {
	0x139, 0x239, 0x339, 0x839, 0x939, 0xa39 };
static const u16 NCT6775_REG_WEIGHT_TEMP_STEP[] = {
	0x13a, 0x23a, 0x33a, 0x83a, 0x93a, 0xa3a };
static const u16 NCT6775_REG_WEIGHT_TEMP_STEP_TOL[] = {
	0x13b, 0x23b, 0x33b, 0x83b, 0x93b, 0xa3b };
static const u16 NCT6775_REG_WEIGHT_DUTY_STEP[] = {
	0x13c, 0x23c, 0x33c, 0x83c, 0x93c, 0xa3c };
static const u16 NCT6775_REG_WEIGHT_TEMP_BASE[] = {
	0x13d, 0x23d, 0x33d, 0x83d, 0x93d, 0xa3d };

static const u16 NCT6775_REG_TEMP_OFFSET[] = { 0x454, 0x455, 0x456 };

static const u16 NCT6775_REG_AUTO_TEMP[] = {
	0x121, 0x221, 0x321, 0x821, 0x921, 0xa21 };
static const u16 NCT6775_REG_AUTO_PWM[] = {
	0x127, 0x227, 0x327, 0x827, 0x927, 0xa27 };

#define NCT6775_AUTO_TEMP(data, nr, p)	((data)->REG_AUTO_TEMP[nr] + (p))
#define NCT6775_AUTO_PWM(data, nr, p)	((data)->REG_AUTO_PWM[nr] + (p))

static const u16 NCT6775_REG_CRITICAL_ENAB[] = { 0x134, 0x234, 0x334 };

static const u16 NCT6775_REG_CRITICAL_TEMP[] = {
	0x135, 0x235, 0x335, 0x835, 0x935, 0xa35 };
static const u16 NCT6775_REG_CRITICAL_TEMP_TOLERANCE[] = {
	0x138, 0x238, 0x338, 0x838, 0x938, 0xa38 };

static const char *const nct6775_temp_label[] = {
	"",
	"SYSTIN",
	"CPUTIN",
	"AUXTIN",
	"AMD SB-TSI",
	"PECI Agent 0",
	"PECI Agent 1",
	"PECI Agent 2",
	"PECI Agent 3",
	"PECI Agent 4",
	"PECI Agent 5",
	"PECI Agent 6",
	"PECI Agent 7",
	"PCH_CHIP_CPU_MAX_TEMP",
	"PCH_CHIP_TEMP",
	"PCH_CPU_TEMP",
	"PCH_MCH_TEMP",
	"PCH_DIM0_TEMP",
	"PCH_DIM1_TEMP",
	"PCH_DIM2_TEMP",
	"PCH_DIM3_TEMP"
};

static const u16 NCT6775_REG_TEMP_ALTERNATE[ARRAY_SIZE(nct6775_temp_label) - 1]
	= { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x661, 0x662, 0x664 };

static const u16 NCT6775_REG_TEMP_CRIT[ARRAY_SIZE(nct6775_temp_label) - 1]
	= { 0, 0, 0, 0, 0xa00, 0xa01, 0xa02, 0xa03, 0xa04, 0xa05, 0xa06,
	    0xa07 };

/* NCT6776 specific data */

/* STEP_UP_TIME and STEP_DOWN_TIME regs are swapped for all chips but NCT6775 */
#define NCT6776_REG_FAN_STEP_UP_TIME NCT6775_REG_FAN_STEP_DOWN_TIME
#define NCT6776_REG_FAN_STEP_DOWN_TIME NCT6775_REG_FAN_STEP_UP_TIME

static const s8 NCT6776_ALARM_BITS[] = {
	0, 1, 2, 3, 8, 21, 20, 16,	/* in0.. in7 */
	17, -1, -1, -1, -1, -1, -1,	/* in8..in14 */
	-1,				/* unused */
	6, 7, 11, 10, 23,		/* fan1..fan5 */
	-1, -1, -1,			/* unused */
	4, 5, 13, -1, -1, -1,		/* temp1..temp6 */
	12, 9 };			/* intrusion0, intrusion1 */

static const u16 NCT6776_REG_BEEP[NUM_REG_BEEP] = { 0xb2, 0xb3, 0xb4, 0xb5 };

static const s8 NCT6776_BEEP_BITS[] = {
	0, 1, 2, 3, 4, 5, 6, 7,		/* in0.. in7 */
	8, -1, -1, -1, -1, -1, -1,	/* in8..in14 */
	24,				/* global beep enable */
	25, 26, 27, 28, 29,		/* fan1..fan5 */
	-1, -1, -1,			/* unused */
	16, 17, 18, 19, 20, 21,		/* temp1..temp6 */
	30, 31 };			/* intrusion0, intrusion1 */

static const u16 NCT6776_REG_TOLERANCE_H[] = {
	0x10c, 0x20c, 0x30c, 0x80c, 0x90c, 0xa0c };

static const u8 NCT6776_REG_PWM_MODE[] = { 0x04, 0, 0, 0, 0, 0 };
static const u8 NCT6776_PWM_MODE_MASK[] = { 0x01, 0, 0, 0, 0, 0 };

static const u16 NCT6776_REG_FAN_MIN[] = { 0x63a, 0x63c, 0x63e, 0x640, 0x642 };
static const u16 NCT6776_REG_FAN_PULSES[NUM_FAN] = {
	0x644, 0x645, 0x646 };

static const u16 NCT6776_REG_WEIGHT_DUTY_BASE[] = {
	0x13e, 0x23e, 0x33e, 0x83e, 0x93e, 0xa3e };

static const u16 NCT6776_REG_TEMP_CONFIG[ARRAY_SIZE(NCT6775_REG_TEMP)] = {
	0x18, 0x152, 0x252, 0x628, 0x629, 0x62A };

static const char *const nct6776_temp_label[] = {
	"",
	"SYSTIN",
	"CPUTIN",
	"AUXTIN",
	"SMBUSMASTER 0",
	"SMBUSMASTER 1",
	"SMBUSMASTER 2",
	"SMBUSMASTER 3",
	"SMBUSMASTER 4",
	"SMBUSMASTER 5",
	"SMBUSMASTER 6",
	"SMBUSMASTER 7",
	"PECI Agent 0",
	"PECI Agent 1",
	"PCH_CHIP_CPU_MAX_TEMP",
	"PCH_CHIP_TEMP",
	"PCH_CPU_TEMP",
	"PCH_MCH_TEMP",
	"PCH_DIM0_TEMP",
	"PCH_DIM1_TEMP",
	"PCH_DIM2_TEMP",
	"PCH_DIM3_TEMP",
	"BYTE_TEMP"
};

static const u16 NCT6776_REG_TEMP_ALTERNATE[ARRAY_SIZE(nct6776_temp_label) - 1]
	= { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x401, 0x402, 0x404 };

static const u16 NCT6776_REG_TEMP_CRIT[ARRAY_SIZE(nct6776_temp_label) - 1]
	= { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x709, 0x70a };

/* NCT6779 specific data */

static const u16 NCT6779_REG_IN[] = {
	0x480, 0x481, 0x482, 0x483, 0x484, 0x485, 0x486, 0x487,
	0x488, 0x489, 0x48a, 0x48b, 0x48c, 0x48d, 0x48e };

static const u16 NCT6779_REG_ALARM[NUM_REG_ALARM] = {
	0x459, 0x45A, 0x45B, 0x568 };

static const s8 NCT6779_ALARM_BITS[] = {
	0, 1, 2, 3, 8, 21, 20, 16,	/* in0.. in7 */
	17, 24, 25, 26, 27, 28, 29,	/* in8..in14 */
	-1,				/* unused */
	6, 7, 11, 10, 23,		/* fan1..fan5 */
	-1, -1, -1,			/* unused */
	4, 5, 13, -1, -1, -1,		/* temp1..temp6 */
	12, 9 };			/* intrusion0, intrusion1 */

static const s8 NCT6779_BEEP_BITS[] = {
	0, 1, 2, 3, 4, 5, 6, 7,		/* in0.. in7 */
	8, 9, 10, 11, 12, 13, 14,	/* in8..in14 */
	24,				/* global beep enable */
	25, 26, 27, 28, 29,		/* fan1..fan5 */
	-1, -1, -1,			/* unused */
	16, 17, -1, -1, -1, -1,		/* temp1..temp6 */
	30, 31 };			/* intrusion0, intrusion1 */

static const u16 NCT6779_REG_FAN[] = {
	0x4b0, 0x4b2, 0x4b4, 0x4b6, 0x4b8, 0x4ba };
static const u16 NCT6779_REG_FAN_PULSES[NUM_FAN] = {
	0x644, 0x645, 0x646, 0x647, 0x648, 0x649 };

static const u16 NCT6779_REG_CRITICAL_PWM_ENABLE[] = {
	0x136, 0x236, 0x336, 0x836, 0x936, 0xa36 };
#define NCT6779_CRITICAL_PWM_ENABLE_MASK	0x01
static const u16 NCT6779_REG_CRITICAL_PWM[] = {
	0x137, 0x237, 0x337, 0x837, 0x937, 0xa37 };

static const u16 NCT6779_REG_TEMP[] = { 0x27, 0x150 };
static const u16 NCT6779_REG_TEMP_MON[] = { 0x73, 0x75, 0x77, 0x79, 0x7b };
static const u16 NCT6779_REG_TEMP_CONFIG[ARRAY_SIZE(NCT6779_REG_TEMP)] = {
	0x18, 0x152 };
static const u16 NCT6779_REG_TEMP_HYST[ARRAY_SIZE(NCT6779_REG_TEMP)] = {
	0x3a, 0x153 };
static const u16 NCT6779_REG_TEMP_OVER[ARRAY_SIZE(NCT6779_REG_TEMP)] = {
	0x39, 0x155 };

static const u16 NCT6779_REG_TEMP_OFFSET[] = {
	0x454, 0x455, 0x456, 0x44a, 0x44b, 0x44c };

static const char *const nct6779_temp_label[] = {
	"",
	"SYSTIN",
	"CPUTIN",
	"AUXTIN0",
	"AUXTIN1",
	"AUXTIN2",
	"AUXTIN3",
	"",
	"SMBUSMASTER 0",
	"SMBUSMASTER 1",
	"SMBUSMASTER 2",
	"SMBUSMASTER 3",
	"SMBUSMASTER 4",
	"SMBUSMASTER 5",
	"SMBUSMASTER 6",
	"SMBUSMASTER 7",
	"PECI Agent 0",
	"PECI Agent 1",
	"PCH_CHIP_CPU_MAX_TEMP",
	"PCH_CHIP_TEMP",
	"PCH_CPU_TEMP",
	"PCH_MCH_TEMP",
	"PCH_DIM0_TEMP",
	"PCH_DIM1_TEMP",
	"PCH_DIM2_TEMP",
	"PCH_DIM3_TEMP",
	"BYTE_TEMP"
};

static const u16 NCT6779_REG_TEMP_ALTERNATE[ARRAY_SIZE(nct6779_temp_label) - 1]
	= { 0x490, 0x491, 0x492, 0x493, 0x494, 0x495, 0, 0,
	    0, 0, 0, 0, 0, 0, 0, 0,
	    0, 0x400, 0x401, 0x402, 0x404, 0x405, 0x406, 0x407,
	    0x408, 0 };

static const u16 NCT6779_REG_TEMP_CRIT[ARRAY_SIZE(nct6779_temp_label) - 1]
	= { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x709, 0x70a };

/* NCT6791 specific data */

#define NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE	0x28

static const u16 NCT6791_REG_WEIGHT_TEMP_SEL[6] = { 0, 0x239 };
static const u16 NCT6791_REG_WEIGHT_TEMP_STEP[6] = { 0, 0x23a };
static const u16 NCT6791_REG_WEIGHT_TEMP_STEP_TOL[6] = { 0, 0x23b };
static const u16 NCT6791_REG_WEIGHT_DUTY_STEP[6] = { 0, 0x23c };
static const u16 NCT6791_REG_WEIGHT_TEMP_BASE[6] = { 0, 0x23d };
static const u16 NCT6791_REG_WEIGHT_DUTY_BASE[6] = { 0, 0x23e };

static const u16 NCT6791_REG_ALARM[NUM_REG_ALARM] = {
	0x459, 0x45A, 0x45B, 0x568, 0x45D };

static const s8 NCT6791_ALARM_BITS[] = {
	0, 1, 2, 3, 8, 21, 20, 16,	/* in0.. in7 */
	17, 24, 25, 26, 27, 28, 29,	/* in8..in14 */
	-1,				/* unused */
	6, 7, 11, 10, 23, 33,		/* fan1..fan6 */
	-1, -1,				/* unused */
	4, 5, 13, -1, -1, -1,		/* temp1..temp6 */
	12, 9 };			/* intrusion0, intrusion1 */


/* NCT6102D/NCT6106D specific data */

#define NCT6106_REG_VBAT	0x318
#define NCT6106_REG_DIODE	0x319
#define NCT6106_DIODE_MASK	0x01

static const u16 NCT6106_REG_IN_MAX[] = {
	0x90, 0x92, 0x94, 0x96, 0x98, 0x9a, 0x9e, 0xa0, 0xa2 };
static const u16 NCT6106_REG_IN_MIN[] = {
	0x91, 0x93, 0x95, 0x97, 0x99, 0x9b, 0x9f, 0xa1, 0xa3 };
static const u16 NCT6106_REG_IN[] = {
	0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x07, 0x08, 0x09 };

static const u16 NCT6106_REG_TEMP[] = { 0x10, 0x11, 0x12, 0x13, 0x14, 0x15 };
static const u16 NCT6106_REG_TEMP_MON[] = { 0x18, 0x19, 0x1a };
static const u16 NCT6106_REG_TEMP_HYST[] = {
	0xc3, 0xc7, 0xcb, 0xcf, 0xd3, 0xd7 };
static const u16 NCT6106_REG_TEMP_OVER[] = {
	0xc2, 0xc6, 0xca, 0xce, 0xd2, 0xd6 };
static const u16 NCT6106_REG_TEMP_CRIT_L[] = {
	0xc0, 0xc4, 0xc8, 0xcc, 0xd0, 0xd4 };
static const u16 NCT6106_REG_TEMP_CRIT_H[] = {
	0xc1, 0xc5, 0xc9, 0xcf, 0xd1, 0xd5 };
static const u16 NCT6106_REG_TEMP_OFFSET[] = { 0x311, 0x312, 0x313 };
static const u16 NCT6106_REG_TEMP_CONFIG[] = {
	0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc };

static const u16 NCT6106_REG_FAN[] = { 0x20, 0x22, 0x24 };
static const u16 NCT6106_REG_FAN_MIN[] = { 0xe0, 0xe2, 0xe4 };
static const u16 NCT6106_REG_FAN_PULSES[] = { 0xf6, 0xf6, 0xf6 };
static const u16 NCT6106_FAN_PULSE_SHIFT[] = { 0, 2, 4 };

static const u8 NCT6106_REG_PWM_MODE[] = { 0xf3, 0xf3, 0xf3 };
static const u8 NCT6106_PWM_MODE_MASK[] = { 0x01, 0x02, 0x04 };
static const u16 NCT6106_REG_PWM[] = { 0x119, 0x129, 0x139 };
static const u16 NCT6106_REG_PWM_READ[] = { 0x4a, 0x4b, 0x4c };
static const u16 NCT6106_REG_FAN_MODE[] = { 0x113, 0x123, 0x133 };
static const u16 NCT6106_REG_TEMP_SEL[] = { 0x110, 0x120, 0x130 };
static const u16 NCT6106_REG_TEMP_SOURCE[] = {
	0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5 };

static const u16 NCT6106_REG_CRITICAL_TEMP[] = { 0x11a, 0x12a, 0x13a };
static const u16 NCT6106_REG_CRITICAL_TEMP_TOLERANCE[] = {
	0x11b, 0x12b, 0x13b };

static const u16 NCT6106_REG_CRITICAL_PWM_ENABLE[] = { 0x11c, 0x12c, 0x13c };
#define NCT6106_CRITICAL_PWM_ENABLE_MASK	0x10
static const u16 NCT6106_REG_CRITICAL_PWM[] = { 0x11d, 0x12d, 0x13d };

static const u16 NCT6106_REG_FAN_STEP_UP_TIME[] = { 0x114, 0x124, 0x134 };
static const u16 NCT6106_REG_FAN_STEP_DOWN_TIME[] = { 0x115, 0x125, 0x135 };
static const u16 NCT6106_REG_FAN_STOP_OUTPUT[] = { 0x116, 0x126, 0x136 };
static const u16 NCT6106_REG_FAN_START_OUTPUT[] = { 0x117, 0x127, 0x137 };
static const u16 NCT6106_REG_FAN_STOP_TIME[] = { 0x118, 0x128, 0x138 };
static const u16 NCT6106_REG_TOLERANCE_H[] = { 0x112, 0x122, 0x132 };

static const u16 NCT6106_REG_TARGET[] = { 0x111, 0x121, 0x131 };

static const u16 NCT6106_REG_WEIGHT_TEMP_SEL[] = { 0x168, 0x178, 0x188 };
static const u16 NCT6106_REG_WEIGHT_TEMP_STEP[] = { 0x169, 0x179, 0x189 };
static const u16 NCT6106_REG_WEIGHT_TEMP_STEP_TOL[] = { 0x16a, 0x17a, 0x18a };
static const u16 NCT6106_REG_WEIGHT_DUTY_STEP[] = { 0x16b, 0x17b, 0x18b };
static const u16 NCT6106_REG_WEIGHT_TEMP_BASE[] = { 0x16c, 0x17c, 0x18c };
static const u16 NCT6106_REG_WEIGHT_DUTY_BASE[] = { 0x16d, 0x17d, 0x18d };

static const u16 NCT6106_REG_AUTO_TEMP[] = { 0x160, 0x170, 0x180 };
static const u16 NCT6106_REG_AUTO_PWM[] = { 0x164, 0x174, 0x184 };

static const u16 NCT6106_REG_ALARM[NUM_REG_ALARM] = {
	0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d };

static const s8 NCT6106_ALARM_BITS[] = {
	0, 1, 2, 3, 4, 5, 7, 8,		/* in0.. in7 */
	9, -1, -1, -1, -1, -1, -1,	/* in8..in14 */
	-1,				/* unused */
	32, 33, 34, -1, -1,		/* fan1..fan5 */
	-1, -1, -1,			/* unused */
	16, 17, 18, 19, 20, 21,		/* temp1..temp6 */
	48, -1				/* intrusion0, intrusion1 */
};

static const u16 NCT6106_REG_BEEP[NUM_REG_BEEP] = {
	0x3c0, 0x3c1, 0x3c2, 0x3c3, 0x3c4 };

static const s8 NCT6106_BEEP_BITS[] = {
	0, 1, 2, 3, 4, 5, 7, 8,		/* in0.. in7 */
	9, 10, 11, 12, -1, -1, -1,	/* in8..in14 */
	32,				/* global beep enable */
	24, 25, 26, 27, 28,		/* fan1..fan5 */
	-1, -1, -1,			/* unused */
	16, 17, 18, 19, 20, 21,		/* temp1..temp6 */
	34, -1				/* intrusion0, intrusion1 */
};

static const u16 NCT6106_REG_TEMP_ALTERNATE[ARRAY_SIZE(nct6776_temp_label) - 1]
	= { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x51, 0x52, 0x54 };

static const u16 NCT6106_REG_TEMP_CRIT[ARRAY_SIZE(nct6776_temp_label) - 1]
	= { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x204, 0x205 };

static enum pwm_enable reg_to_pwm_enable(int pwm, int mode)
{
	if (mode == 0 && pwm == 255)
		return off;
	return mode + 1;
}

static int pwm_enable_to_reg(enum pwm_enable mode)
{
	if (mode == off)
		return 0;
	return mode - 1;
}

/*
 * Conversions
 */

/* 1 is DC mode, output in ms */
static unsigned int step_time_from_reg(u8 reg, u8 mode)
{
	return mode ? 400 * reg : 100 * reg;
}

static u8 step_time_to_reg(unsigned int msec, u8 mode)
{
	return clamp_val((mode ? (msec + 200) / 400 :
					(msec + 50) / 100), 1, 255);
}

static unsigned int fan_from_reg8(u16 reg, unsigned int divreg)
{
	if (reg == 0 || reg == 255)
		return 0;
	return 1350000U / (reg << divreg);
}

static unsigned int fan_from_reg13(u16 reg, unsigned int divreg)
{
	if ((reg & 0xff1f) == 0xff1f)
		return 0;

	reg = (reg & 0x1f) | ((reg & 0xff00) >> 3);

	if (reg == 0)
		return 0;

	return 1350000U / reg;
}

static unsigned int fan_from_reg16(u16 reg, unsigned int divreg)
{
	if (reg == 0 || reg == 0xffff)
		return 0;

	/*
	 * Even though the registers are 16 bit wide, the fan divisor
	 * still applies.
	 */
	return 1350000U / (reg << divreg);
}

static u16 fan_to_reg(u32 fan, unsigned int divreg)
{
	if (!fan)
		return 0;

	return (1350000U / fan) >> divreg;
}

static inline unsigned int
div_from_reg(u8 reg)
{
	return 1 << reg;
}

/*
 * Some of the voltage inputs have internal scaling, the tables below
 * contain 8 (the ADC LSB in mV) * scaling factor * 100
 */
static const u16 scale_in[15] = {
	800, 800, 1600, 1600, 800, 800, 800, 1600, 1600, 800, 800, 800, 800,
	800, 800
};

static inline long in_from_reg(u8 reg, u8 nr)
{
	return DIV_ROUND_CLOSEST(reg * scale_in[nr], 100);
}

static inline u8 in_to_reg(u32 val, u8 nr)
{
	return clamp_val(DIV_ROUND_CLOSEST(val * 100, scale_in[nr]), 0, 255);
}

/*
 * Data structures and manipulation thereof
 */

struct nct6775_data {
	int addr;	/* IO base of hw monitor block */
	int sioreg;	/* SIO register address */
	enum kinds kind;
	const char *name;

	int num_attr_groups;
	const struct attribute_group *groups[6];

	u16 reg_temp[5][NUM_TEMP]; /* 0=temp, 1=temp_over, 2=temp_hyst,
				    * 3=temp_crit, 4=temp_lcrit
				    */
	u8 temp_src[NUM_TEMP];
	u16 reg_temp_config[NUM_TEMP];
	const char * const *temp_label;
	int temp_label_num;

	u16 REG_CONFIG;
	u16 REG_VBAT;
	u16 REG_DIODE;
	u8 DIODE_MASK;

	const s8 *ALARM_BITS;
	const s8 *BEEP_BITS;

	const u16 *REG_VIN;
	const u16 *REG_IN_MINMAX[2];

	const u16 *REG_TARGET;
	const u16 *REG_FAN;
	const u16 *REG_FAN_MODE;
	const u16 *REG_FAN_MIN;
	const u16 *REG_FAN_PULSES;
	const u16 *FAN_PULSE_SHIFT;
	const u16 *REG_FAN_TIME[3];

	const u16 *REG_TOLERANCE_H;

	const u8 *REG_PWM_MODE;
	const u8 *PWM_MODE_MASK;

	const u16 *REG_PWM[7];	/* [0]=pwm, [1]=pwm_start, [2]=pwm_floor,
				 * [3]=pwm_max, [4]=pwm_step,
				 * [5]=weight_duty_step, [6]=weight_duty_base
				 */
	const u16 *REG_PWM_READ;

	const u16 *REG_CRITICAL_PWM_ENABLE;
	u8 CRITICAL_PWM_ENABLE_MASK;
	const u16 *REG_CRITICAL_PWM;

	const u16 *REG_AUTO_TEMP;
	const u16 *REG_AUTO_PWM;

	const u16 *REG_CRITICAL_TEMP;
	const u16 *REG_CRITICAL_TEMP_TOLERANCE;

	const u16 *REG_TEMP_SOURCE;	/* temp register sources */
	const u16 *REG_TEMP_SEL;
	const u16 *REG_WEIGHT_TEMP_SEL;
	const u16 *REG_WEIGHT_TEMP[3];	/* 0=base, 1=tolerance, 2=step */

	const u16 *REG_TEMP_OFFSET;

	const u16 *REG_ALARM;
	const u16 *REG_BEEP;

	unsigned int (*fan_from_reg)(u16 reg, unsigned int divreg);
	unsigned int (*fan_from_reg_min)(u16 reg, unsigned int divreg);

	struct mutex update_lock;
	bool valid;		/* true if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	/* Register values */
	u8 bank;		/* current register bank */
	u8 in_num;		/* number of in inputs we have */
	u8 in[15][3];		/* [0]=in, [1]=in_max, [2]=in_min */
	unsigned int rpm[NUM_FAN];
	u16 fan_min[NUM_FAN];
	u8 fan_pulses[NUM_FAN];
	u8 fan_div[NUM_FAN];
	u8 has_pwm;
	u8 has_fan;		/* some fan inputs can be disabled */
	u8 has_fan_min;		/* some fans don't have min register */
	bool has_fan_div;

	u8 num_temp_alarms;	/* 2, 3, or 6 */
	u8 num_temp_beeps;	/* 2, 3, or 6 */
	u8 temp_fixed_num;	/* 3 or 6 */
	u8 temp_type[NUM_TEMP_FIXED];
	s8 temp_offset[NUM_TEMP_FIXED];
	s16 temp[5][NUM_TEMP]; /* 0=temp, 1=temp_over, 2=temp_hyst,
				* 3=temp_crit, 4=temp_lcrit */
	u64 alarms;
	u64 beeps;

	u8 pwm_num;	/* number of pwm */
	u8 pwm_mode[NUM_FAN];	/* 1->DC variable voltage,
				 * 0->PWM variable duty cycle
				 */
	enum pwm_enable pwm_enable[NUM_FAN];
			/* 0->off
			 * 1->manual
			 * 2->thermal cruise mode (also called SmartFan I)
			 * 3->fan speed cruise mode
			 * 4->SmartFan III
			 * 5->enhanced variable thermal cruise (SmartFan IV)
			 */
	u8 pwm[7][NUM_FAN];	/* [0]=pwm, [1]=pwm_start, [2]=pwm_floor,
				 * [3]=pwm_max, [4]=pwm_step,
				 * [5]=weight_duty_step, [6]=weight_duty_base
				 */

	u8 target_temp[NUM_FAN];
	u8 target_temp_mask;
	u32 target_speed[NUM_FAN];
	u32 target_speed_tolerance[NUM_FAN];
	u8 speed_tolerance_limit;

	u8 temp_tolerance[2][NUM_FAN];
	u8 tolerance_mask;

	u8 fan_time[3][NUM_FAN]; /* 0 = stop_time, 1 = step_up, 2 = step_down */

	/* Automatic fan speed control registers */
	int auto_pwm_num;
	u8 auto_pwm[NUM_FAN][7];
	u8 auto_temp[NUM_FAN][7];
	u8 pwm_temp_sel[NUM_FAN];
	u8 pwm_weight_temp_sel[NUM_FAN];
	u8 weight_temp[3][NUM_FAN];	/* 0->temp_step, 1->temp_step_tol,
					 * 2->temp_base
					 */

	u8 vid;
	u8 vrm;

	bool have_vid;

	u16 have_temp;
	u16 have_temp_fixed;
	u16 have_in;
#ifdef CONFIG_PM
	/* Remember extra register values over suspend/resume */
	u8 vbat;
	u8 fandiv1;
	u8 fandiv2;
#endif
};

struct nct6775_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 *
nct6775_create_attr_group(struct device *dev, struct sensor_template_group *tg,
			  int repeat)
{
	struct attribute_group *group;
	struct sensor_device_attr_u *su;
	struct sensor_device_attribute *a;
	struct sensor_device_attribute_2 *a2;
	struct attribute **attrs;
	struct sensor_device_template **t;
	int i, 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;
		while (*t != NULL) {
			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;
}

static bool is_word_sized(struct nct6775_data *data, u16 reg)
{
	switch (data->kind) {
	case nct6106:
		return reg == 0x20 || reg == 0x22 || reg == 0x24 ||
		  reg == 0xe0 || reg == 0xe2 || reg == 0xe4 ||
		  reg == 0x111 || reg == 0x121 || reg == 0x131;
	case nct6775:
		return (((reg & 0xff00) == 0x100 ||
		    (reg & 0xff00) == 0x200) &&
		   ((reg & 0x00ff) == 0x50 ||
		    (reg & 0x00ff) == 0x53 ||
		    (reg & 0x00ff) == 0x55)) ||
		  (reg & 0xfff0) == 0x630 ||
		  reg == 0x640 || reg == 0x642 ||
		  reg == 0x662 ||
		  ((reg & 0xfff0) == 0x650 && (reg & 0x000f) >= 0x06) ||
		  reg == 0x73 || reg == 0x75 || reg == 0x77;
	case nct6776:
		return (((reg & 0xff00) == 0x100 ||
		    (reg & 0xff00) == 0x200) &&
		   ((reg & 0x00ff) == 0x50 ||
		    (reg & 0x00ff) == 0x53 ||
		    (reg & 0x00ff) == 0x55)) ||
		  (reg & 0xfff0) == 0x630 ||
		  reg == 0x402 ||
		  reg == 0x640 || reg == 0x642 ||
		  ((reg & 0xfff0) == 0x650 && (reg & 0x000f) >= 0x06) ||
		  reg == 0x73 || reg == 0x75 || reg == 0x77;
	case nct6779:
	case nct6791:
		return reg == 0x150 || reg == 0x153 || reg == 0x155 ||
		  ((reg & 0xfff0) == 0x4b0 && (reg & 0x000f) < 0x0b) ||
		  reg == 0x402 ||
		  reg == 0x63a || reg == 0x63c || reg == 0x63e ||
		  reg == 0x640 || reg == 0x642 ||
		  reg == 0x73 || reg == 0x75 || reg == 0x77 || reg == 0x79 ||
		  reg == 0x7b;
	}
	return false;
}

/*
 * On older chips, only registers 0x50-0x5f are banked.
 * On more recent chips, all registers are banked.
 * Assume that is the case and set the bank number for each access.
 * Cache the bank number so it only needs to be set if it changes.
 */
static inline void nct6775_set_bank(struct nct6775_data *data, u16 reg)
{
	u8 bank = reg >> 8;
	if (data->bank != bank) {
		outb_p(NCT6775_REG_BANK, data->addr + ADDR_REG_OFFSET);
		outb_p(bank, data->addr + DATA_REG_OFFSET);
		data->bank = bank;
	}
}

static u16 nct6775_read_value(struct nct6775_data *data, u16 reg)
{
	int res, word_sized = is_word_sized(data, reg);

	nct6775_set_bank(data, reg);
	outb_p(reg & 0xff, data->addr + ADDR_REG_OFFSET);
	res = inb_p(data->addr + DATA_REG_OFFSET);
	if (word_sized) {
		outb_p((reg & 0xff) + 1,
		       data->addr + ADDR_REG_OFFSET);
		res = (res << 8) + inb_p(data->addr + DATA_REG_OFFSET);
	}
	return res;
}

static int nct6775_write_value(struct nct6775_data *data, u16 reg, u16 value)
{
	int word_sized = is_word_sized(data, reg);

	nct6775_set_bank(data, reg);
	outb_p(reg & 0xff, data->addr + ADDR_REG_OFFSET);
	if (word_sized) {
		outb_p(value >> 8, data->addr + DATA_REG_OFFSET);
		outb_p((reg & 0xff) + 1,
		       data->addr + ADDR_REG_OFFSET);
	}
	outb_p(value & 0xff, data->addr + DATA_REG_OFFSET);
	return 0;
}

/* We left-align 8-bit temperature values to make the code simpler */
static u16 nct6775_read_temp(struct nct6775_data *data, u16 reg)
{
	u16 res;

	res = nct6775_read_value(data, reg);
	if (!is_word_sized(data, reg))
		res <<= 8;

	return res;
}

static int nct6775_write_temp(struct nct6775_data *data, u16 reg, u16 value)
{
	if (!is_word_sized(data, reg))
		value >>= 8;
	return nct6775_write_value(data, reg, value);
}

/* This function assumes that the caller holds data->update_lock */
static void nct6775_write_fan_div(struct nct6775_data *data, int nr)
{
	u8 reg;

	switch (nr) {
	case 0:
		reg = (nct6775_read_value(data, NCT6775_REG_FANDIV1) & 0x70)
		    | (data->fan_div[0] & 0x7);
		nct6775_write_value(data, NCT6775_REG_FANDIV1, reg);
		break;
	case 1:
		reg = (nct6775_read_value(data, NCT6775_REG_FANDIV1) & 0x7)
		    | ((data->fan_div[1] << 4) & 0x70);
		nct6775_write_value(data, NCT6775_REG_FANDIV1, reg);
		break;
	case 2:
		reg = (nct6775_read_value(data, NCT6775_REG_FANDIV2) & 0x70)
		    | (data->fan_div[2] & 0x7);
		nct6775_write_value(data, NCT6775_REG_FANDIV2, reg);
		break;
	case 3:
		reg = (nct6775_read_value(data, NCT6775_REG_FANDIV2) & 0x7)
		    | ((data->fan_div[3] << 4) & 0x70);
		nct6775_write_value(data, NCT6775_REG_FANDIV2, reg);
		break;
	}
}

static void nct6775_write_fan_div_common(struct nct6775_data *data, int nr)
{
	if (data->kind == nct6775)
		nct6775_write_fan_div(data, nr);
}

static void nct6775_update_fan_div(struct nct6775_data *data)
{
	u8 i;

	i = nct6775_read_value(data, NCT6775_REG_FANDIV1);
	data->fan_div[0] = i & 0x7;
	data->fan_div[1] = (i & 0x70) >> 4;
	i = nct6775_read_value(data, NCT6775_REG_FANDIV2);
	data->fan_div[2] = i & 0x7;
	if (data->has_fan & (1 << 3))
		data->fan_div[3] = (i & 0x70) >> 4;
}

static void nct6775_update_fan_div_common(struct nct6775_data *data)
{
	if (data->kind == nct6775)
		nct6775_update_fan_div(data);
}

static void nct6775_init_fan_div(struct nct6775_data *data)
{
	int i;

	nct6775_update_fan_div_common(data);
	/*
	 * For all fans, start with highest divider value if the divider
	 * register is not initialized. This ensures that we get a
	 * reading from the fan count register, even if it is not optimal.
	 * We'll compute a better divider later on.
	 */
	for (i = 0; i < ARRAY_SIZE(data->fan_div); i++) {
		if (!(data->has_fan & (1 << i)))
			continue;
		if (data->fan_div[i] == 0) {
			data->fan_div[i] = 7;
			nct6775_write_fan_div_common(data, i);
		}
	}
}

static void nct6775_init_fan_common(struct device *dev,
				    struct nct6775_data *data)
{
	int i;
	u8 reg;

	if (data->has_fan_div)
		nct6775_init_fan_div(data);

	/*
	 * If fan_min is not set (0), set it to 0xff to disable it. This
	 * prevents the unnecessary warning when fanX_min is reported as 0.
	 */
	for (i = 0; i < ARRAY_SIZE(data->fan_min); i++) {
		if (data->has_fan_min & (1 << i)) {
			reg = nct6775_read_value(data, data->REG_FAN_MIN[i]);
			if (!reg)
				nct6775_write_value(data, data->REG_FAN_MIN[i],
						    data->has_fan_div ? 0xff
								      : 0xff1f);
		}
	}
}

static void nct6775_select_fan_div(struct device *dev,
				   struct nct6775_data *data, int nr, u16 reg)
{
	u8 fan_div = data->fan_div[nr];
	u16 fan_min;

	if (!data->has_fan_div)
		return;

	/*
	 * If we failed to measure the fan speed, or the reported value is not
	 * in the optimal range, and the clock divider can be modified,
	 * let's try that for next time.
	 */
	if (reg == 0x00 && fan_div < 0x07)
		fan_div++;
	else if (reg != 0x00 && reg < 0x30 && fan_div > 0)
		fan_div--;

	if (fan_div != data->fan_div[nr]) {
		dev_dbg(dev, "Modifying fan%d clock divider from %u to %u\n",
			nr + 1, div_from_reg(data->fan_div[nr]),
			div_from_reg(fan_div));

		/* Preserve min limit if possible */
		if (data->has_fan_min & (1 << nr)) {
			fan_min = data->fan_min[nr];
			if (fan_div > data->fan_div[nr]) {
				if (fan_min != 255 && fan_min > 1)
					fan_min >>= 1;
			} else {
				if (fan_min != 255) {
					fan_min <<= 1;
					if (fan_min > 254)
						fan_min = 254;
				}
			}
			if (fan_min != data->fan_min[nr]) {
				data->fan_min[nr] = fan_min;
				nct6775_write_value(data, data->REG_FAN_MIN[nr],
						    fan_min);
			}
		}
		data->fan_div[nr] = fan_div;
		nct6775_write_fan_div_common(data, nr);
	}
}

static void nct6775_update_pwm(struct device *dev)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	int i, j;
	int fanmodecfg, reg;
	bool duty_is_dc;

	for (i = 0; i < data->pwm_num; i++) {
		if (!(data->has_pwm & (1 << i)))
			continue;

		duty_is_dc = data->REG_PWM_MODE[i] &&
		  (nct6775_read_value(data, data->REG_PWM_MODE[i])
		   & data->PWM_MODE_MASK[i]);
		data->pwm_mode[i] = !duty_is_dc;

		fanmodecfg = nct6775_read_value(data, data->REG_FAN_MODE[i]);
		for (j = 0; j < ARRAY_SIZE(data->REG_PWM); j++) {
			if (data->REG_PWM[j] && data->REG_PWM[j][i]) {
				data->pwm[j][i]
				  = nct6775_read_value(data,
						       data->REG_PWM[j][i]);
			}
		}

		data->pwm_enable[i] = reg_to_pwm_enable(data->pwm[0][i],
							(fanmodecfg >> 4) & 7);

		if (!data->temp_tolerance[0][i] ||
		    data->pwm_enable[i] != speed_cruise)
			data->temp_tolerance[0][i] = fanmodecfg & 0x0f;
		if (!data->target_speed_tolerance[i] ||
		    data->pwm_enable[i] == speed_cruise) {
			u8 t = fanmodecfg & 0x0f;
			if (data->REG_TOLERANCE_H) {
				t |= (nct6775_read_value(data,
				      data->REG_TOLERANCE_H[i]) & 0x70) >> 1;
			}
			data->target_speed_tolerance[i] = t;
		}

		data->temp_tolerance[1][i] =
			nct6775_read_value(data,
					data->REG_CRITICAL_TEMP_TOLERANCE[i]);

		reg = nct6775_read_value(data, data->REG_TEMP_SEL[i]);
		data->pwm_temp_sel[i] = reg & 0x1f;
		/* If fan can stop, report floor as 0 */
		if (reg & 0x80)
			data->pwm[2][i] = 0;

		if (!data->REG_WEIGHT_TEMP_SEL[i])
			continue;

		reg = nct6775_read_value(data, data->REG_WEIGHT_TEMP_SEL[i]);
		data->pwm_weight_temp_sel[i] = reg & 0x1f;
		/* If weight is disabled, report weight source as 0 */
		if (!(reg & 0x80))
			data->pwm_weight_temp_sel[i] = 0;

		/* Weight temp data */
		for (j = 0; j < ARRAY_SIZE(data->weight_temp); j++) {
			data->weight_temp[j][i]
			  = nct6775_read_value(data,
					       data->REG_WEIGHT_TEMP[j][i]);
		}
	}
}

static void nct6775_update_pwm_limits(struct device *dev)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	int i, j;
	u8 reg;
	u16 reg_t;

	for (i = 0; i < data->pwm_num; i++) {
		if (!(data->has_pwm & (1 << i)))
			continue;

		for (j = 0; j < ARRAY_SIZE(data->fan_time); j++) {
			data->fan_time[j][i] =
			  nct6775_read_value(data, data->REG_FAN_TIME[j][i]);
		}

		reg_t = nct6775_read_value(data, data->REG_TARGET[i]);
		/* Update only in matching mode or if never updated */
		if (!data->target_temp[i] ||
		    data->pwm_enable[i] == thermal_cruise)
			data->target_temp[i] = reg_t & data->target_temp_mask;
		if (!data->target_speed[i] ||
		    data->pwm_enable[i] == speed_cruise) {
			if (data->REG_TOLERANCE_H) {
				reg_t |= (nct6775_read_value(data,
					data->REG_TOLERANCE_H[i]) & 0x0f) << 8;
			}
			data->target_speed[i] = reg_t;
		}

		for (j = 0; j < data->auto_pwm_num; j++) {
			data->auto_pwm[i][j] =
			  nct6775_read_value(data,
					     NCT6775_AUTO_PWM(data, i, j));
			data->auto_temp[i][j] =
			  nct6775_read_value(data,
					     NCT6775_AUTO_TEMP(data, i, j));
		}

		/* critical auto_pwm temperature data */
		data->auto_temp[i][data->auto_pwm_num] =
			nct6775_read_value(data, data->REG_CRITICAL_TEMP[i]);

		switch (data->kind) {
		case nct6775:
			reg = nct6775_read_value(data,
						 NCT6775_REG_CRITICAL_ENAB[i]);
			data->auto_pwm[i][data->auto_pwm_num] =
						(reg & 0x02) ? 0xff : 0x00;
			break;
		case nct6776:
			data->auto_pwm[i][data->auto_pwm_num] = 0xff;
			break;
		case nct6106:
		case nct6779:
		case nct6791:
			reg = nct6775_read_value(data,
					data->REG_CRITICAL_PWM_ENABLE[i]);
			if (reg & data->CRITICAL_PWM_ENABLE_MASK)
				reg = nct6775_read_value(data,
					data->REG_CRITICAL_PWM[i]);
			else
				reg = 0xff;
			data->auto_pwm[i][data->auto_pwm_num] = reg;
			break;
		}
	}
}

static struct nct6775_data *nct6775_update_device(struct device *dev)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	int i, j;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		/* Fan clock dividers */
		nct6775_update_fan_div_common(data);

		/* Measured voltages and limits */
		for (i = 0; i < data->in_num; i++) {
			if (!(data->have_in & (1 << i)))
				continue;

			data->in[i][0] = nct6775_read_value(data,
							    data->REG_VIN[i]);
			data->in[i][1] = nct6775_read_value(data,
					  data->REG_IN_MINMAX[0][i]);
			data->in[i][2] = nct6775_read_value(data,
					  data->REG_IN_MINMAX[1][i]);
		}

		/* Measured fan speeds and limits */
		for (i = 0; i < ARRAY_SIZE(data->rpm); i++) {
			u16 reg;

			if (!(data->has_fan & (1 << i)))
				continue;

			reg = nct6775_read_value(data, data->REG_FAN[i]);
			data->rpm[i] = data->fan_from_reg(reg,
							  data->fan_div[i]);

			if (data->has_fan_min & (1 << i))
				data->fan_min[i] = nct6775_read_value(data,
					   data->REG_FAN_MIN[i]);

			if (data->REG_FAN_PULSES[i]) {
				data->fan_pulses[i] =
				  (nct6775_read_value(data,
						      data->REG_FAN_PULSES[i])
				   >> data->FAN_PULSE_SHIFT[i]) & 0x03;
			}

			nct6775_select_fan_div(dev, data, i, reg);
		}

		nct6775_update_pwm(dev);
		nct6775_update_pwm_limits(dev);

		/* Measured temperatures and limits */
		for (i = 0; i < NUM_TEMP; i++) {
			if (!(data->have_temp & (1 << i)))
				continue;
			for (j = 0; j < ARRAY_SIZE(data->reg_temp); j++) {
				if (data->reg_temp[j][i])
					data->temp[j][i]
					  = nct6775_read_temp(data,
						data->reg_temp[j][i]);
			}
			if (i >= NUM_TEMP_FIXED ||
			    !(data->have_temp_fixed & (1 << i)))
				continue;
			data->temp_offset[i]
			  = nct6775_read_value(data, data->REG_TEMP_OFFSET[i]);
		}

		data->alarms = 0;
		for (i = 0; i < NUM_REG_ALARM; i++) {
			u8 alarm;
			if (!data->REG_ALARM[i])
				continue;
			alarm = nct6775_read_value(data, data->REG_ALARM[i]);
			data->alarms |= ((u64)alarm) << (i << 3);
		}

		data->beeps = 0;
		for (i = 0; i < NUM_REG_BEEP; i++) {
			u8 beep;
			if (!data->REG_BEEP[i])
				continue;
			beep = nct6775_read_value(data, data->REG_BEEP[i]);
			data->beeps |= ((u64)beep) << (i << 3);
		}

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

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

/*
 * Sysfs callback functions
 */
static ssize_t
show_in_reg(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;
	return sprintf(buf, "%ld\n", in_from_reg(data->in[nr][index], nr));
}

static ssize_t
store_in_reg(struct device *dev, struct device_attribute *attr, const char *buf,
	     size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;
	unsigned long val;
	int err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;
	mutex_lock(&data->update_lock);
	data->in[nr][index] = in_to_reg(val, nr);
	nct6775_write_value(data, data->REG_IN_MINMAX[index - 1][nr],
			    data->in[nr][index]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
show_alarm(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = data->ALARM_BITS[sattr->index];
	return sprintf(buf, "%u\n",
		       (unsigned int)((data->alarms >> nr) & 0x01));
}

static int find_temp_source(struct nct6775_data *data, int index, int count)
{
	int source = data->temp_src[index];
	int nr;

	for (nr = 0; nr < count; nr++) {
		int src;

		src = nct6775_read_value(data,
					 data->REG_TEMP_SOURCE[nr]) & 0x1f;
		if (src == source)
			return nr;
	}
	return -ENODEV;
}

static ssize_t
show_temp_alarm(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct6775_data *data = nct6775_update_device(dev);
	unsigned int alarm = 0;
	int nr;

	/*
	 * For temperatures, there is no fixed mapping from registers to alarm
	 * bits. Alarm bits are determined by the temperature source mapping.
	 */
	nr = find_temp_source(data, sattr->index, data->num_temp_alarms);
	if (nr >= 0) {
		int bit = data->ALARM_BITS[nr + TEMP_ALARM_BASE];
		alarm = (data->alarms >> bit) & 0x01;
	}
	return sprintf(buf, "%u\n", alarm);
}

static ssize_t
show_beep(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct6775_data *data = nct6775_update_device(dev);
	int nr = data->BEEP_BITS[sattr->index];

	return sprintf(buf, "%u\n",
		       (unsigned int)((data->beeps >> nr) & 0x01));
}

static ssize_t
store_beep(struct device *dev, struct device_attribute *attr, const char *buf,
	   size_t count)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct6775_data *data = dev_get_drvdata(dev);
	int nr = data->BEEP_BITS[sattr->index];
	int regindex = nr >> 3;
	unsigned long val;

	int err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;
	if (val > 1)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	if (val)
		data->beeps |= (1ULL << nr);
	else
		data->beeps &= ~(1ULL << nr);
	nct6775_write_value(data, data->REG_BEEP[regindex],
			    (data->beeps >> (regindex << 3)) & 0xff);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
show_temp_beep(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	struct nct6775_data *data = nct6775_update_device(dev);
	unsigned int beep = 0;
	int nr;

	/*
	 * For temperatures, there is no fixed mapping from registers to beep
	 * enable bits. Beep enable bits are determined by the temperature
	 * source mapping.
	 */
	nr = find_temp_source(data, sattr->index, data->num_temp_beeps);
	if (nr >= 0) {
		int bit = data->BEEP_BITS[nr + TEMP_ALARM_BASE];
		beep = (data->beeps >> bit) & 0x01;
	}
	return sprintf(buf, "%u\n", beep);
}

static ssize_t
store_temp_beep(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	struct nct6775_data *data = dev_get_drvdata(dev);
	int nr, bit, regindex;
	unsigned long val;

	int err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;
	if (val > 1)
		return -EINVAL;

	nr = find_temp_source(data, sattr->index, data->num_temp_beeps);
	if (nr < 0)
		return nr;

	bit = data->BEEP_BITS[nr + TEMP_ALARM_BASE];
	regindex = bit >> 3;

	mutex_lock(&data->update_lock);
	if (val)
		data->beeps |= (1ULL << bit);
	else
		data->beeps &= ~(1ULL << bit);
	nct6775_write_value(data, data->REG_BEEP[regindex],
			    (data->beeps >> (regindex << 3)) & 0xff);
	mutex_unlock(&data->update_lock);

	return count;
}

static umode_t nct6775_in_is_visible(struct kobject *kobj,
				     struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct6775_data *data = dev_get_drvdata(dev);
	int in = index / 5;	/* voltage index */

	if (!(data->have_in & (1 << in)))
		return 0;

	return attr->mode;
}

SENSOR_TEMPLATE_2(in_input, "in%d_input", S_IRUGO, show_in_reg, NULL, 0, 0);
SENSOR_TEMPLATE(in_alarm, "in%d_alarm", S_IRUGO, show_alarm, NULL, 0);
SENSOR_TEMPLATE(in_beep, "in%d_beep", S_IWUSR | S_IRUGO, show_beep, store_beep,
		0);
SENSOR_TEMPLATE_2(in_min, "in%d_min", S_IWUSR | S_IRUGO, show_in_reg,
		  store_in_reg, 0, 1);
SENSOR_TEMPLATE_2(in_max, "in%d_max", S_IWUSR | S_IRUGO, show_in_reg,
		  store_in_reg, 0, 2);

/*
 * nct6775_in_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 *nct6775_attributes_in_template[] = {
	&sensor_dev_template_in_input,
	&sensor_dev_template_in_alarm,
	&sensor_dev_template_in_beep,
	&sensor_dev_template_in_min,
	&sensor_dev_template_in_max,
	NULL
};

static struct sensor_template_group nct6775_in_template_group = {
	.templates = nct6775_attributes_in_template,
	.is_visible = nct6775_in_is_visible,
};

static ssize_t
show_fan(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	return sprintf(buf, "%d\n", data->rpm[nr]);
}

static ssize_t
show_fan_min(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	return sprintf(buf, "%d\n",
		       data->fan_from_reg_min(data->fan_min[nr],
					      data->fan_div[nr]));
}

static ssize_t
show_fan_div(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	return sprintf(buf, "%u\n", div_from_reg(data->fan_div[nr]));
}

static ssize_t
store_fan_min(struct device *dev, struct device_attribute *attr,
	      const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err;
	unsigned int reg;
	u8 new_div;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	mutex_lock(&data->update_lock);
	if (!data->has_fan_div) {
		/* NCT6776F or NCT6779D; we know this is a 13 bit register */
		if (!val) {
			val = 0xff1f;
		} else {
			if (val > 1350000U)
				val = 135000U;
			val = 1350000U / val;
			val = (val & 0x1f) | ((val << 3) & 0xff00);
		}
		data->fan_min[nr] = val;
		goto write_min;	/* Leave fan divider alone */
	}
	if (!val) {
		/* No min limit, alarm disabled */
		data->fan_min[nr] = 255;
		new_div = data->fan_div[nr]; /* No change */
		dev_info(dev, "fan%u low limit and alarm disabled\n", nr + 1);
		goto write_div;
	}
	reg = 1350000U / val;
	if (reg >= 128 * 255) {
		/*
		 * Speed below this value cannot possibly be represented,
		 * even with the highest divider (128)
		 */
		data->fan_min[nr] = 254;
		new_div = 7; /* 128 == (1 << 7) */
		dev_warn(dev,
			 "fan%u low limit %lu below minimum %u, set to minimum\n",
			 nr + 1, val, data->fan_from_reg_min(254, 7));
	} else if (!reg) {
		/*
		 * Speed above this value cannot possibly be represented,
		 * even with the lowest divider (1)
		 */
		data->fan_min[nr] = 1;
		new_div = 0; /* 1 == (1 << 0) */
		dev_warn(dev,
			 "fan%u low limit %lu above maximum %u, set to maximum\n",
			 nr + 1, val, data->fan_from_reg_min(1, 0));
	} else {
		/*
		 * Automatically pick the best divider, i.e. the one such
		 * that the min limit will correspond to a register value
		 * in the 96..192 range
		 */
		new_div = 0;
		while (reg > 192 && new_div < 7) {
			reg >>= 1;
			new_div++;
		}
		data->fan_min[nr] = reg;
	}

write_div:
	/*
	 * Write both the fan clock divider (if it changed) and the new
	 * fan min (unconditionally)
	 */
	if (new_div != data->fan_div[nr]) {
		dev_dbg(dev, "fan%u clock divider changed from %u to %u\n",
			nr + 1, div_from_reg(data->fan_div[nr]),
			div_from_reg(new_div));
		data->fan_div[nr] = new_div;
		nct6775_write_fan_div_common(data, nr);
		/* Give the chip time to sample a new speed value */
		data->last_updated = jiffies;
	}

write_min:
	nct6775_write_value(data, data->REG_FAN_MIN[nr], data->fan_min[nr]);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t
show_fan_pulses(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int p = data->fan_pulses[sattr->index];

	return sprintf(buf, "%d\n", p ? : 4);
}

static ssize_t
store_fan_pulses(struct device *dev, struct device_attribute *attr,
		 const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err;
	u8 reg;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	if (val > 4)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->fan_pulses[nr] = val & 3;
	reg = nct6775_read_value(data, data->REG_FAN_PULSES[nr]);
	reg &= ~(0x03 << data->FAN_PULSE_SHIFT[nr]);
	reg |= (val & 3) << data->FAN_PULSE_SHIFT[nr];
	nct6775_write_value(data, data->REG_FAN_PULSES[nr], reg);
	mutex_unlock(&data->update_lock);

	return count;
}

static umode_t nct6775_fan_is_visible(struct kobject *kobj,
				      struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct6775_data *data = dev_get_drvdata(dev);
	int fan = index / 6;	/* fan index */
	int nr = index % 6;	/* attribute index */

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

	if (nr == 1 && data->ALARM_BITS[FAN_ALARM_BASE + fan] == -1)
		return 0;
	if (nr == 2 && data->BEEP_BITS[FAN_ALARM_BASE + fan] == -1)
		return 0;
	if (nr == 4 && !(data->has_fan_min & (1 << fan)))
		return 0;
	if (nr == 5 && data->kind != nct6775)
		return 0;

	return attr->mode;
}

SENSOR_TEMPLATE(fan_input, "fan%d_input", S_IRUGO, show_fan, NULL, 0);
SENSOR_TEMPLATE(fan_alarm, "fan%d_alarm", S_IRUGO, show_alarm, NULL,
		FAN_ALARM_BASE);
SENSOR_TEMPLATE(fan_beep, "fan%d_beep", S_IWUSR | S_IRUGO, show_beep,
		store_beep, FAN_ALARM_BASE);
SENSOR_TEMPLATE(fan_pulses, "fan%d_pulses", S_IWUSR | S_IRUGO, show_fan_pulses,
		store_fan_pulses, 0);
SENSOR_TEMPLATE(fan_min, "fan%d_min", S_IWUSR | S_IRUGO, show_fan_min,
		store_fan_min, 0);
SENSOR_TEMPLATE(fan_div, "fan%d_div", S_IRUGO, show_fan_div, NULL, 0);

/*
 * nct6775_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 *nct6775_attributes_fan_template[] = {
	&sensor_dev_template_fan_input,
	&sensor_dev_template_fan_alarm,	/* 1 */
	&sensor_dev_template_fan_beep,	/* 2 */
	&sensor_dev_template_fan_pulses,
	&sensor_dev_template_fan_min,	/* 4 */
	&sensor_dev_template_fan_div,	/* 5 */
	NULL
};

static struct sensor_template_group nct6775_fan_template_group = {
	.templates = nct6775_attributes_fan_template,
	.is_visible = nct6775_fan_is_visible,
	.base = 1,
};

static ssize_t
show_temp_label(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	return sprintf(buf, "%s\n", data->temp_label[data->temp_src[nr]]);
}

static ssize_t
show_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;

	return sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(data->temp[index][nr]));
}

static ssize_t
store_temp(struct device *dev, struct device_attribute *attr, const char *buf,
	   size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;
	int err;
	long val;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	mutex_lock(&data->update_lock);
	data->temp[index][nr] = LM75_TEMP_TO_REG(val);
	nct6775_write_temp(data, data->reg_temp[index][nr],
			   data->temp[index][nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
show_temp_offset(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);

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

static ssize_t
store_temp_offset(struct device *dev, struct device_attribute *attr,
		  const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	long val;
	int err;

	err = kstrtol(buf, 10, &val);
	if (err < 0)
		return err;

	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), -128, 127);

	mutex_lock(&data->update_lock);
	data->temp_offset[nr] = val;
	nct6775_write_value(data, data->REG_TEMP_OFFSET[nr], val);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t
show_temp_type(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	return sprintf(buf, "%d\n", (int)data->temp_type[nr]);
}

static ssize_t
store_temp_type(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err;
	u8 vbat, diode, vbit, dbit;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	if (val != 1 && val != 3 && val != 4)
		return -EINVAL;

	mutex_lock(&data->update_lock);

	data->temp_type[nr] = val;
	vbit = 0x02 << nr;
	dbit = data->DIODE_MASK << nr;
	vbat = nct6775_read_value(data, data->REG_VBAT) & ~vbit;
	diode = nct6775_read_value(data, data->REG_DIODE) & ~dbit;
	switch (val) {
	case 1:	/* CPU diode (diode, current mode) */
		vbat |= vbit;
		diode |= dbit;
		break;
	case 3: /* diode, voltage mode */
		vbat |= dbit;
		break;
	case 4:	/* thermistor */
		break;
	}
	nct6775_write_value(data, data->REG_VBAT, vbat);
	nct6775_write_value(data, data->REG_DIODE, diode);

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

static umode_t nct6775_temp_is_visible(struct kobject *kobj,
				       struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct6775_data *data = dev_get_drvdata(dev);
	int temp = index / 10;	/* temp index */
	int nr = index % 10;	/* attribute index */

	if (!(data->have_temp & (1 << temp)))
		return 0;

	if (nr == 2 && find_temp_source(data, temp, data->num_temp_alarms) < 0)
		return 0;				/* alarm */

	if (nr == 3 && find_temp_source(data, temp, data->num_temp_beeps) < 0)
		return 0;				/* beep */

	if (nr == 4 && !data->reg_temp[1][temp])	/* max */
		return 0;

	if (nr == 5 && !data->reg_temp[2][temp])	/* max_hyst */
		return 0;

	if (nr == 6 && !data->reg_temp[3][temp])	/* crit */
		return 0;

	if (nr == 7 && !data->reg_temp[4][temp])	/* lcrit */
		return 0;

	/* offset and type only apply to fixed sensors */
	if (nr > 7 && !(data->have_temp_fixed & (1 << temp)))
		return 0;

	return attr->mode;
}

SENSOR_TEMPLATE_2(temp_input, "temp%d_input", S_IRUGO, show_temp, NULL, 0, 0);
SENSOR_TEMPLATE(temp_label, "temp%d_label", S_IRUGO, show_temp_label, NULL, 0);
SENSOR_TEMPLATE_2(temp_max, "temp%d_max", S_IRUGO | S_IWUSR, show_temp,
		  store_temp, 0, 1);
SENSOR_TEMPLATE_2(temp_max_hyst, "temp%d_max_hyst", S_IRUGO | S_IWUSR,
		  show_temp, store_temp, 0, 2);
SENSOR_TEMPLATE_2(temp_crit, "temp%d_crit", S_IRUGO | S_IWUSR, show_temp,
		  store_temp, 0, 3);
SENSOR_TEMPLATE_2(temp_lcrit, "temp%d_lcrit", S_IRUGO | S_IWUSR, show_temp,
		  store_temp, 0, 4);
SENSOR_TEMPLATE(temp_offset, "temp%d_offset", S_IRUGO | S_IWUSR,
		show_temp_offset, store_temp_offset, 0);
SENSOR_TEMPLATE(temp_type, "temp%d_type", S_IRUGO | S_IWUSR, show_temp_type,
		store_temp_type, 0);
SENSOR_TEMPLATE(temp_alarm, "temp%d_alarm", S_IRUGO, show_temp_alarm, NULL, 0);
SENSOR_TEMPLATE(temp_beep, "temp%d_beep", S_IRUGO | S_IWUSR, show_temp_beep,
		store_temp_beep, 0);

/*
 * nct6775_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 *nct6775_attributes_temp_template[] = {
	&sensor_dev_template_temp_input,
	&sensor_dev_template_temp_label,
	&sensor_dev_template_temp_alarm,	/* 2 */
	&sensor_dev_template_temp_beep,		/* 3 */
	&sensor_dev_template_temp_max,		/* 4 */
	&sensor_dev_template_temp_max_hyst,	/* 5 */
	&sensor_dev_template_temp_crit,		/* 6 */
	&sensor_dev_template_temp_lcrit,	/* 7 */
	&sensor_dev_template_temp_offset,	/* 8 */
	&sensor_dev_template_temp_type,		/* 9 */
	NULL
};

static struct sensor_template_group nct6775_temp_template_group = {
	.templates = nct6775_attributes_temp_template,
	.is_visible = nct6775_temp_is_visible,
	.base = 1,
};

static ssize_t
show_pwm_mode(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);

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

static ssize_t
store_pwm_mode(struct device *dev, struct device_attribute *attr,
	       const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err;
	u8 reg;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	if (val > 1)
		return -EINVAL;

	/* Setting DC mode (0) is not supported for all chips/channels */
	if (data->REG_PWM_MODE[nr] == 0) {
		if (!val)
			return -EINVAL;
		return count;
	}

	mutex_lock(&data->update_lock);
	data->pwm_mode[nr] = val;
	reg = nct6775_read_value(data, data->REG_PWM_MODE[nr]);
	reg &= ~data->PWM_MODE_MASK[nr];
	if (!val)
		reg |= data->PWM_MODE_MASK[nr];
	nct6775_write_value(data, data->REG_PWM_MODE[nr], reg);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
show_pwm(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;
	int pwm;

	/*
	 * For automatic fan control modes, show current pwm readings.
	 * Otherwise, show the configured value.
	 */
	if (index == 0 && data->pwm_enable[nr] > manual)
		pwm = nct6775_read_value(data, data->REG_PWM_READ[nr]);
	else
		pwm = data->pwm[index][nr];

	return sprintf(buf, "%d\n", pwm);
}

static ssize_t
store_pwm(struct device *dev, struct device_attribute *attr, const char *buf,
	  size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;
	unsigned long val;
	int minval[7] = { 0, 1, 1, data->pwm[2][nr], 0, 0, 0 };
	int maxval[7]
	  = { 255, 255, data->pwm[3][nr] ? : 255, 255, 255, 255, 255 };
	int err;
	u8 reg;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;
	val = clamp_val(val, minval[index], maxval[index]);

	mutex_lock(&data->update_lock);
	data->pwm[index][nr] = val;
	nct6775_write_value(data, data->REG_PWM[index][nr], val);
	if (index == 2)	{ /* floor: disable if val == 0 */
		reg = nct6775_read_value(data, data->REG_TEMP_SEL[nr]);
		reg &= 0x7f;
		if (val)
			reg |= 0x80;
		nct6775_write_value(data, data->REG_TEMP_SEL[nr], reg);
	}
	mutex_unlock(&data->update_lock);
	return count;
}

/* Returns 0 if OK, -EINVAL otherwise */
static int check_trip_points(struct nct6775_data *data, int nr)
{
	int i;

	for (i = 0; i < data->auto_pwm_num - 1; i++) {
		if (data->auto_temp[nr][i] > data->auto_temp[nr][i + 1])
			return -EINVAL;
	}
	for (i = 0; i < data->auto_pwm_num - 1; i++) {
		if (data->auto_pwm[nr][i] > data->auto_pwm[nr][i + 1])
			return -EINVAL;
	}
	/* validate critical temperature and pwm if enabled (pwm > 0) */
	if (data->auto_pwm[nr][data->auto_pwm_num]) {
		if (data->auto_temp[nr][data->auto_pwm_num - 1] >
				data->auto_temp[nr][data->auto_pwm_num] ||
		    data->auto_pwm[nr][data->auto_pwm_num - 1] >
				data->auto_pwm[nr][data->auto_pwm_num])
			return -EINVAL;
	}
	return 0;
}

static void pwm_update_registers(struct nct6775_data *data, int nr)
{
	u8 reg;

	switch (data->pwm_enable[nr]) {
	case off:
	case manual:
		break;
	case speed_cruise:
		reg = nct6775_read_value(data, data->REG_FAN_MODE[nr]);
		reg = (reg & ~data->tolerance_mask) |
		  (data->target_speed_tolerance[nr] & data->tolerance_mask);
		nct6775_write_value(data, data->REG_FAN_MODE[nr], reg);
		nct6775_write_value(data, data->REG_TARGET[nr],
				    data->target_speed[nr] & 0xff);
		if (data->REG_TOLERANCE_H) {
			reg = (data->target_speed[nr] >> 8) & 0x0f;
			reg |= (data->target_speed_tolerance[nr] & 0x38) << 1;
			nct6775_write_value(data,
					    data->REG_TOLERANCE_H[nr],
					    reg);
		}
		break;
	case thermal_cruise:
		nct6775_write_value(data, data->REG_TARGET[nr],
				    data->target_temp[nr]);
		/* intentional */
	default:
		reg = nct6775_read_value(data, data->REG_FAN_MODE[nr]);
		reg = (reg & ~data->tolerance_mask) |
		  data->temp_tolerance[0][nr];
		nct6775_write_value(data, data->REG_FAN_MODE[nr], reg);
		break;
	}
}

static ssize_t
show_pwm_enable(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);

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

static ssize_t
store_pwm_enable(struct device *dev, struct device_attribute *attr,
		 const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err;
	u16 reg;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	if (val > sf4)
		return -EINVAL;

	if (val == sf3 && data->kind != nct6775)
		return -EINVAL;

	if (val == sf4 && check_trip_points(data, nr)) {
		dev_err(dev, "Inconsistent trip points, not switching to SmartFan IV mode\n");
		dev_err(dev, "Adjust trip points and try again\n");
		return -EINVAL;
	}

	mutex_lock(&data->update_lock);
	data->pwm_enable[nr] = val;
	if (val == off) {
		/*
		 * turn off pwm control: select manual mode, set pwm to maximum
		 */
		data->pwm[0][nr] = 255;
		nct6775_write_value(data, data->REG_PWM[0][nr], 255);
	}
	pwm_update_registers(data, nr);
	reg = nct6775_read_value(data, data->REG_FAN_MODE[nr]);
	reg &= 0x0f;
	reg |= pwm_enable_to_reg(val) << 4;
	nct6775_write_value(data, data->REG_FAN_MODE[nr], reg);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
show_pwm_temp_sel_common(struct nct6775_data *data, char *buf, int src)
{
	int i, sel = 0;

	for (i = 0; i < NUM_TEMP; i++) {
		if (!(data->have_temp & (1 << i)))
			continue;
		if (src == data->temp_src[i]) {
			sel = i + 1;
			break;
		}
	}

	return sprintf(buf, "%d\n", sel);
}

static ssize_t
show_pwm_temp_sel(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int index = sattr->index;

	return show_pwm_temp_sel_common(data, buf, data->pwm_temp_sel[index]);
}

static ssize_t
store_pwm_temp_sel(struct device *dev, struct device_attribute *attr,
		   const char *buf, size_t count)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err, reg, src;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;
	if (val == 0 || val > NUM_TEMP)
		return -EINVAL;
	if (!(data->have_temp & (1 << (val - 1))) || !data->temp_src[val - 1])
		return -EINVAL;

	mutex_lock(&data->update_lock);
	src = data->temp_src[val - 1];
	data->pwm_temp_sel[nr] = src;
	reg = nct6775_read_value(data, data->REG_TEMP_SEL[nr]);
	reg &= 0xe0;
	reg |= src;
	nct6775_write_value(data, data->REG_TEMP_SEL[nr], reg);
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t
show_pwm_weight_temp_sel(struct device *dev, struct device_attribute *attr,
			 char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int index = sattr->index;

	return show_pwm_temp_sel_common(data, buf,
					data->pwm_weight_temp_sel[index]);
}

static ssize_t
store_pwm_weight_temp_sel(struct device *dev, struct device_attribute *attr,
			  const char *buf, size_t count)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err, reg, src;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;
	if (val > NUM_TEMP)
		return -EINVAL;
	val = array_index_nospec(val, NUM_TEMP + 1);
	if (val && (!(data->have_temp & (1 << (val - 1))) ||
		    !data->temp_src[val - 1]))
		return -EINVAL;

	mutex_lock(&data->update_lock);
	if (val) {
		src = data->temp_src[val - 1];
		data->pwm_weight_temp_sel[nr] = src;
		reg = nct6775_read_value(data, data->REG_WEIGHT_TEMP_SEL[nr]);
		reg &= 0xe0;
		reg |= (src | 0x80);
		nct6775_write_value(data, data->REG_WEIGHT_TEMP_SEL[nr], reg);
	} else {
		data->pwm_weight_temp_sel[nr] = 0;
		reg = nct6775_read_value(data, data->REG_WEIGHT_TEMP_SEL[nr]);
		reg &= 0x7f;
		nct6775_write_value(data, data->REG_WEIGHT_TEMP_SEL[nr], reg);
	}
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t
show_target_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);

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

static ssize_t
store_target_temp(struct device *dev, struct device_attribute *attr,
		  const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0,
			data->target_temp_mask);

	mutex_lock(&data->update_lock);
	data->target_temp[nr] = val;
	pwm_update_registers(data, nr);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
show_target_speed(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;

	return sprintf(buf, "%d\n",
		       fan_from_reg16(data->target_speed[nr],
				      data->fan_div[nr]));
}

static ssize_t
store_target_speed(struct device *dev, struct device_attribute *attr,
		   const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err;
	u16 speed;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	val = clamp_val(val, 0, 1350000U);
	speed = fan_to_reg(val, data->fan_div[nr]);

	mutex_lock(&data->update_lock);
	data->target_speed[nr] = speed;
	pwm_update_registers(data, nr);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
show_temp_tolerance(struct device *dev, struct device_attribute *attr,
		    char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;

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

static ssize_t
store_temp_tolerance(struct device *dev, struct device_attribute *attr,
		     const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	/* Limit tolerance as needed */
	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, data->tolerance_mask);

	mutex_lock(&data->update_lock);
	data->temp_tolerance[index][nr] = val;
	if (index)
		pwm_update_registers(data, nr);
	else
		nct6775_write_value(data,
				    data->REG_CRITICAL_TEMP_TOLERANCE[nr],
				    val);
	mutex_unlock(&data->update_lock);
	return count;
}

/*
 * Fan speed tolerance is a tricky beast, since the associated register is
 * a tick counter, but the value is reported and configured as rpm.
 * Compute resulting low and high rpm values and report the difference.
 */
static ssize_t
show_speed_tolerance(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	int low = data->target_speed[nr] - data->target_speed_tolerance[nr];
	int high = data->target_speed[nr] + data->target_speed_tolerance[nr];
	int tolerance;

	if (low <= 0)
		low = 1;
	if (high > 0xffff)
		high = 0xffff;
	if (high < low)
		high = low;

	tolerance = (fan_from_reg16(low, data->fan_div[nr])
		     - fan_from_reg16(high, data->fan_div[nr])) / 2;

	return sprintf(buf, "%d\n", tolerance);
}

static ssize_t
store_speed_tolerance(struct device *dev, struct device_attribute *attr,
		      const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
	int nr = sattr->index;
	unsigned long val;
	int err;
	int low, high;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	high = fan_from_reg16(data->target_speed[nr],
			      data->fan_div[nr]) + val;
	low = fan_from_reg16(data->target_speed[nr],
			     data->fan_div[nr]) - val;
	if (low <= 0)
		low = 1;
	if (high < low)
		high = low;

	val = (fan_to_reg(low, data->fan_div[nr]) -
	       fan_to_reg(high, data->fan_div[nr])) / 2;

	/* Limit tolerance as needed */
	val = clamp_val(val, 0, data->speed_tolerance_limit);

	mutex_lock(&data->update_lock);
	data->target_speed_tolerance[nr] = val;
	pwm_update_registers(data, nr);
	mutex_unlock(&data->update_lock);
	return count;
}

SENSOR_TEMPLATE_2(pwm, "pwm%d", S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0, 0);
SENSOR_TEMPLATE(pwm_mode, "pwm%d_mode", S_IWUSR | S_IRUGO, show_pwm_mode,
		store_pwm_mode, 0);
SENSOR_TEMPLATE(pwm_enable, "pwm%d_enable", S_IWUSR | S_IRUGO, show_pwm_enable,
		store_pwm_enable, 0);
SENSOR_TEMPLATE(pwm_temp_sel, "pwm%d_temp_sel", S_IWUSR | S_IRUGO,
		show_pwm_temp_sel, store_pwm_temp_sel, 0);
SENSOR_TEMPLATE(pwm_target_temp, "pwm%d_target_temp", S_IWUSR | S_IRUGO,
		show_target_temp, store_target_temp, 0);
SENSOR_TEMPLATE(fan_target, "fan%d_target", S_IWUSR | S_IRUGO,
		show_target_speed, store_target_speed, 0);
SENSOR_TEMPLATE(fan_tolerance, "fan%d_tolerance", S_IWUSR | S_IRUGO,
		show_speed_tolerance, store_speed_tolerance, 0);

/* Smart Fan registers */

static ssize_t
show_weight_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;

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

static ssize_t
store_weight_temp(struct device *dev, struct device_attribute *attr,
		  const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	val = clamp_val(DIV_ROUND_CLOSEST(val, 1000), 0, 255);

	mutex_lock(&data->update_lock);
	data->weight_temp[index][nr] = val;
	nct6775_write_value(data, data->REG_WEIGHT_TEMP[index][nr], val);
	mutex_unlock(&data->update_lock);
	return count;
}

SENSOR_TEMPLATE(pwm_weight_temp_sel, "pwm%d_weight_temp_sel", S_IWUSR | S_IRUGO,
		  show_pwm_weight_temp_sel, store_pwm_weight_temp_sel, 0);
SENSOR_TEMPLATE_2(pwm_weight_temp_step, "pwm%d_weight_temp_step",
		  S_IWUSR | S_IRUGO, show_weight_temp, store_weight_temp, 0, 0);
SENSOR_TEMPLATE_2(pwm_weight_temp_step_tol, "pwm%d_weight_temp_step_tol",
		  S_IWUSR | S_IRUGO, show_weight_temp, store_weight_temp, 0, 1);
SENSOR_TEMPLATE_2(pwm_weight_temp_step_base, "pwm%d_weight_temp_step_base",
		  S_IWUSR | S_IRUGO, show_weight_temp, store_weight_temp, 0, 2);
SENSOR_TEMPLATE_2(pwm_weight_duty_step, "pwm%d_weight_duty_step",
		  S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0, 5);
SENSOR_TEMPLATE_2(pwm_weight_duty_base, "pwm%d_weight_duty_base",
		  S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0, 6);

static ssize_t
show_fan_time(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;

	return sprintf(buf, "%d\n",
		       step_time_from_reg(data->fan_time[index][nr],
					  data->pwm_mode[nr]));
}

static ssize_t
store_fan_time(struct device *dev, struct device_attribute *attr,
	       const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int index = sattr->index;
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;

	val = step_time_to_reg(val, data->pwm_mode[nr]);
	mutex_lock(&data->update_lock);
	data->fan_time[index][nr] = val;
	nct6775_write_value(data, data->REG_FAN_TIME[index][nr], val);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
show_auto_pwm(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);

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

static ssize_t
store_auto_pwm(struct device *dev, struct device_attribute *attr,
	       const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int point = sattr->index;
	unsigned long val;
	int err;
	u8 reg;

	err = kstrtoul(buf, 10, &val);
	if (err < 0)
		return err;
	if (val > 255)
		return -EINVAL;

	if (point == data->auto_pwm_num) {
		if (data->kind != nct6775 && !val)
			return -EINVAL;
		if (data->kind != nct6779 && val)
			val = 0xff;
	}

	mutex_lock(&data->update_lock);
	data->auto_pwm[nr][point] = val;
	if (point < data->auto_pwm_num) {
		nct6775_write_value(data,
				    NCT6775_AUTO_PWM(data, nr, point),
				    data->auto_pwm[nr][point]);
	} else {
		switch (data->kind) {
		case nct6775:
			/* disable if needed (pwm == 0) */
			reg = nct6775_read_value(data,
						 NCT6775_REG_CRITICAL_ENAB[nr]);
			if (val)
				reg |= 0x02;
			else
				reg &= ~0x02;
			nct6775_write_value(data, NCT6775_REG_CRITICAL_ENAB[nr],
					    reg);
			break;
		case nct6776:
			break; /* always enabled, nothing to do */
		case nct6106:
		case nct6779:
		case nct6791:
			nct6775_write_value(data, data->REG_CRITICAL_PWM[nr],
					    val);
			reg = nct6775_read_value(data,
					data->REG_CRITICAL_PWM_ENABLE[nr]);
			if (val == 255)
				reg &= ~data->CRITICAL_PWM_ENABLE_MASK;
			else
				reg |= data->CRITICAL_PWM_ENABLE_MASK;
			nct6775_write_value(data,
					    data->REG_CRITICAL_PWM_ENABLE[nr],
					    reg);
			break;
		}
	}
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
show_auto_temp(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = nct6775_update_device(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int point = sattr->index;

	/*
	 * We don't know for sure if the temperature is signed or unsigned.
	 * Assume it is unsigned.
	 */
	return sprintf(buf, "%d\n", data->auto_temp[nr][point] * 1000);
}

static ssize_t
store_auto_temp(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	struct sensor_device_attribute_2 *sattr = to_sensor_dev_attr_2(attr);
	int nr = sattr->nr;
	int point = sattr->index;
	unsigned long val;
	int err;

	err = kstrtoul(buf, 10, &val);
	if (err)
		return err;
	if (val > 255000)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	data->auto_temp[nr][point] = DIV_ROUND_CLOSEST(val, 1000);
	if (point < data->auto_pwm_num) {
		nct6775_write_value(data,
				    NCT6775_AUTO_TEMP(data, nr, point),
				    data->auto_temp[nr][point]);
	} else {
		nct6775_write_value(data, data->REG_CRITICAL_TEMP[nr],
				    data->auto_temp[nr][point]);
	}
	mutex_unlock(&data->update_lock);
	return count;
}

static umode_t nct6775_pwm_is_visible(struct kobject *kobj,
				      struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct6775_data *data = dev_get_drvdata(dev);
	int pwm = index / 36;	/* pwm index */
	int nr = index % 36;	/* attribute index */

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

	if ((nr >= 14 && nr <= 18) || nr == 21)   /* weight */
		if (!data->REG_WEIGHT_TEMP_SEL[pwm])
			return 0;
	if (nr == 19 && data->REG_PWM[3] == NULL) /* pwm_max */
		return 0;
	if (nr == 20 && data->REG_PWM[4] == NULL) /* pwm_step */
		return 0;
	if (nr == 21 && data->REG_PWM[6] == NULL) /* weight_duty_base */
		return 0;

	if (nr >= 22 && nr <= 35) {		/* auto point */
		int api = (nr - 22) / 2;	/* auto point index */

		if (api > data->auto_pwm_num)
			return 0;
	}
	return attr->mode;
}

SENSOR_TEMPLATE_2(pwm_stop_time, "pwm%d_stop_time", S_IWUSR | S_IRUGO,
		  show_fan_time, store_fan_time, 0, 0);
SENSOR_TEMPLATE_2(pwm_step_up_time, "pwm%d_step_up_time", S_IWUSR | S_IRUGO,
		  show_fan_time, store_fan_time, 0, 1);
SENSOR_TEMPLATE_2(pwm_step_down_time, "pwm%d_step_down_time", S_IWUSR | S_IRUGO,
		  show_fan_time, store_fan_time, 0, 2);
SENSOR_TEMPLATE_2(pwm_start, "pwm%d_start", S_IWUSR | S_IRUGO, show_pwm,
		  store_pwm, 0, 1);
SENSOR_TEMPLATE_2(pwm_floor, "pwm%d_floor", S_IWUSR | S_IRUGO, show_pwm,
		  store_pwm, 0, 2);
SENSOR_TEMPLATE_2(pwm_temp_tolerance, "pwm%d_temp_tolerance", S_IWUSR | S_IRUGO,
		  show_temp_tolerance, store_temp_tolerance, 0, 0);
SENSOR_TEMPLATE_2(pwm_crit_temp_tolerance, "pwm%d_crit_temp_tolerance",
		  S_IWUSR | S_IRUGO, show_temp_tolerance, store_temp_tolerance,
		  0, 1);

SENSOR_TEMPLATE_2(pwm_max, "pwm%d_max", S_IWUSR | S_IRUGO, show_pwm, store_pwm,
		  0, 3);

SENSOR_TEMPLATE_2(pwm_step, "pwm%d_step", S_IWUSR | S_IRUGO, show_pwm,
		  store_pwm, 0, 4);

SENSOR_TEMPLATE_2(pwm_auto_point1_pwm, "pwm%d_auto_point1_pwm",
		  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 0);
SENSOR_TEMPLATE_2(pwm_auto_point1_temp, "pwm%d_auto_point1_temp",
		  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 0);

SENSOR_TEMPLATE_2(pwm_auto_point2_pwm, "pwm%d_auto_point2_pwm",
		  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 1);
SENSOR_TEMPLATE_2(pwm_auto_point2_temp, "pwm%d_auto_point2_temp",
		  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 1);

SENSOR_TEMPLATE_2(pwm_auto_point3_pwm, "pwm%d_auto_point3_pwm",
		  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 2);
SENSOR_TEMPLATE_2(pwm_auto_point3_temp, "pwm%d_auto_point3_temp",
		  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 2);

SENSOR_TEMPLATE_2(pwm_auto_point4_pwm, "pwm%d_auto_point4_pwm",
		  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 3);
SENSOR_TEMPLATE_2(pwm_auto_point4_temp, "pwm%d_auto_point4_temp",
		  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 3);

SENSOR_TEMPLATE_2(pwm_auto_point5_pwm, "pwm%d_auto_point5_pwm",
		  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 4);
SENSOR_TEMPLATE_2(pwm_auto_point5_temp, "pwm%d_auto_point5_temp",
		  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 4);

SENSOR_TEMPLATE_2(pwm_auto_point6_pwm, "pwm%d_auto_point6_pwm",
		  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 5);
SENSOR_TEMPLATE_2(pwm_auto_point6_temp, "pwm%d_auto_point6_temp",
		  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 5);

SENSOR_TEMPLATE_2(pwm_auto_point7_pwm, "pwm%d_auto_point7_pwm",
		  S_IWUSR | S_IRUGO, show_auto_pwm, store_auto_pwm, 0, 6);
SENSOR_TEMPLATE_2(pwm_auto_point7_temp, "pwm%d_auto_point7_temp",
		  S_IWUSR | S_IRUGO, show_auto_temp, store_auto_temp, 0, 6);

/*
 * nct6775_pwm_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 *nct6775_attributes_pwm_template[] = {
	&sensor_dev_template_pwm,
	&sensor_dev_template_pwm_mode,
	&sensor_dev_template_pwm_enable,
	&sensor_dev_template_pwm_temp_sel,
	&sensor_dev_template_pwm_temp_tolerance,
	&sensor_dev_template_pwm_crit_temp_tolerance,
	&sensor_dev_template_pwm_target_temp,
	&sensor_dev_template_fan_target,
	&sensor_dev_template_fan_tolerance,
	&sensor_dev_template_pwm_stop_time,
	&sensor_dev_template_pwm_step_up_time,
	&sensor_dev_template_pwm_step_down_time,
	&sensor_dev_template_pwm_start,
	&sensor_dev_template_pwm_floor,
	&sensor_dev_template_pwm_weight_temp_sel,	/* 14 */
	&sensor_dev_template_pwm_weight_temp_step,
	&sensor_dev_template_pwm_weight_temp_step_tol,
	&sensor_dev_template_pwm_weight_temp_step_base,
	&sensor_dev_template_pwm_weight_duty_step,	/* 18 */
	&sensor_dev_template_pwm_max,			/* 19 */
	&sensor_dev_template_pwm_step,			/* 20 */
	&sensor_dev_template_pwm_weight_duty_base,	/* 21 */
	&sensor_dev_template_pwm_auto_point1_pwm,	/* 22 */
	&sensor_dev_template_pwm_auto_point1_temp,
	&sensor_dev_template_pwm_auto_point2_pwm,
	&sensor_dev_template_pwm_auto_point2_temp,
	&sensor_dev_template_pwm_auto_point3_pwm,
	&sensor_dev_template_pwm_auto_point3_temp,
	&sensor_dev_template_pwm_auto_point4_pwm,
	&sensor_dev_template_pwm_auto_point4_temp,
	&sensor_dev_template_pwm_auto_point5_pwm,
	&sensor_dev_template_pwm_auto_point5_temp,
	&sensor_dev_template_pwm_auto_point6_pwm,
	&sensor_dev_template_pwm_auto_point6_temp,
	&sensor_dev_template_pwm_auto_point7_pwm,
	&sensor_dev_template_pwm_auto_point7_temp,	/* 35 */

	NULL
};

static struct sensor_template_group nct6775_pwm_template_group = {
	.templates = nct6775_attributes_pwm_template,
	.is_visible = nct6775_pwm_is_visible,
	.base = 1,
};

static ssize_t
show_vid(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
}

static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);

/* Case open detection */

static ssize_t
clear_caseopen(struct device *dev, struct device_attribute *attr,
	       const char *buf, size_t count)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	int nr = to_sensor_dev_attr(attr)->index - INTRUSION_ALARM_BASE;
	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.
	 * The CR registers are the same for all chips, and not all chips
	 * support clearing the caseopen status through "regular" registers.
	 */
	ret = superio_enter(data->sioreg);
	if (ret) {
		count = ret;
		goto error;
	}

	superio_select(data->sioreg, NCT6775_LD_ACPI);
	reg = superio_inb(data->sioreg, NCT6775_REG_CR_CASEOPEN_CLR[nr]);
	reg |= NCT6775_CR_CASEOPEN_CLR_MASK[nr];
	superio_outb(data->sioreg, NCT6775_REG_CR_CASEOPEN_CLR[nr], reg);
	reg &= ~NCT6775_CR_CASEOPEN_CLR_MASK[nr];
	superio_outb(data->sioreg, NCT6775_REG_CR_CASEOPEN_CLR[nr], reg);
	superio_exit(data->sioreg);

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

static SENSOR_DEVICE_ATTR(intrusion0_alarm, S_IWUSR | S_IRUGO, show_alarm,
			  clear_caseopen, INTRUSION_ALARM_BASE);
static SENSOR_DEVICE_ATTR(intrusion1_alarm, S_IWUSR | S_IRUGO, show_alarm,
			  clear_caseopen, INTRUSION_ALARM_BASE + 1);
static SENSOR_DEVICE_ATTR(intrusion0_beep, S_IWUSR | S_IRUGO, show_beep,
			  store_beep, INTRUSION_ALARM_BASE);
static SENSOR_DEVICE_ATTR(intrusion1_beep, S_IWUSR | S_IRUGO, show_beep,
			  store_beep, INTRUSION_ALARM_BASE + 1);
static SENSOR_DEVICE_ATTR(beep_enable, S_IWUSR | S_IRUGO, show_beep,
			  store_beep, BEEP_ENABLE_BASE);

static umode_t nct6775_other_is_visible(struct kobject *kobj,
					struct attribute *attr, int index)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct nct6775_data *data = dev_get_drvdata(dev);

	if (index == 0 && !data->have_vid)
		return 0;

	if (index == 1 || index == 2) {
		if (data->ALARM_BITS[INTRUSION_ALARM_BASE + index - 1] < 0)
			return 0;
	}

	if (index == 3 || index == 4) {
		if (data->BEEP_BITS[INTRUSION_ALARM_BASE + index - 3] < 0)
			return 0;
	}

	return attr->mode;
}

/*
 * nct6775_other_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 attribute *nct6775_attributes_other[] = {
	&dev_attr_cpu0_vid.attr,				/* 0 */
	&sensor_dev_attr_intrusion0_alarm.dev_attr.attr,	/* 1 */
	&sensor_dev_attr_intrusion1_alarm.dev_attr.attr,	/* 2 */
	&sensor_dev_attr_intrusion0_beep.dev_attr.attr,		/* 3 */
	&sensor_dev_attr_intrusion1_beep.dev_attr.attr,		/* 4 */
	&sensor_dev_attr_beep_enable.dev_attr.attr,		/* 5 */

	NULL
};

static const struct attribute_group nct6775_group_other = {
	.attrs = nct6775_attributes_other,
	.is_visible = nct6775_other_is_visible,
};

static inline void nct6775_init_device(struct nct6775_data *data)
{
	int i;
	u8 tmp, diode;

	/* Start monitoring if needed */
	if (data->REG_CONFIG) {
		tmp = nct6775_read_value(data, data->REG_CONFIG);
		if (!(tmp & 0x01))
			nct6775_write_value(data, data->REG_CONFIG, tmp | 0x01);
	}

	/* Enable temperature sensors if needed */
	for (i = 0; i < NUM_TEMP; i++) {
		if (!(data->have_temp & (1 << i)))
			continue;
		if (!data->reg_temp_config[i])
			continue;
		tmp = nct6775_read_value(data, data->reg_temp_config[i]);
		if (tmp & 0x01)
			nct6775_write_value(data, data->reg_temp_config[i],
					    tmp & 0xfe);
	}

	/* Enable VBAT monitoring if needed */
	tmp = nct6775_read_value(data, data->REG_VBAT);
	if (!(tmp & 0x01))
		nct6775_write_value(data, data->REG_VBAT, tmp | 0x01);

	diode = nct6775_read_value(data, data->REG_DIODE);

	for (i = 0; i < data->temp_fixed_num; i++) {
		if (!(data->have_temp_fixed & (1 << i)))
			continue;
		if ((tmp & (data->DIODE_MASK << i)))	/* diode */
			data->temp_type[i]
			  = 3 - ((diode >> i) & data->DIODE_MASK);
		else				/* thermistor */
			data->temp_type[i] = 4;
	}
}

static void
nct6775_check_fan_inputs(struct nct6775_data *data)
{
	bool fan3pin, fan4pin, fan4min, fan5pin, fan6pin;
	bool pwm3pin, pwm4pin, pwm5pin, pwm6pin;
	int sioreg = data->sioreg;
	int regval;

	/* fan4 and fan5 share some pins with the GPIO and serial flash */
	if (data->kind == nct6775) {
		regval = superio_inb(sioreg, 0x2c);

		fan3pin = regval & (1 << 6);
		pwm3pin = regval & (1 << 7);

		/* On NCT6775, fan4 shares pins with the fdc interface */
		fan4pin = !(superio_inb(sioreg, 0x2A) & 0x80);
		fan4min = false;
		fan5pin = false;
		fan6pin = false;
		pwm4pin = false;
		pwm5pin = false;
		pwm6pin = false;
	} else if (data->kind == nct6776) {
		bool gpok = superio_inb(sioreg, 0x27) & 0x80;

		superio_select(sioreg, NCT6775_LD_HWM);
		regval = superio_inb(sioreg, SIO_REG_ENABLE);

		if (regval & 0x80)
			fan3pin = gpok;
		else
			fan3pin = !(superio_inb(sioreg, 0x24) & 0x40);

		if (regval & 0x40)
			fan4pin = gpok;
		else
			fan4pin = superio_inb(sioreg, 0x1C) & 0x01;

		if (regval & 0x20)
			fan5pin = gpok;
		else
			fan5pin = superio_inb(sioreg, 0x1C) & 0x02;

		fan4min = fan4pin;
		fan6pin = false;
		pwm3pin = fan3pin;
		pwm4pin = false;
		pwm5pin = false;
		pwm6pin = false;
	} else if (data->kind == nct6106) {
		regval = superio_inb(sioreg, 0x24);
		fan3pin = !(regval & 0x80);
		pwm3pin = regval & 0x08;

		fan4pin = false;
		fan4min = false;
		fan5pin = false;
		fan6pin = false;
		pwm4pin = false;
		pwm5pin = false;
		pwm6pin = false;
	} else {	/* NCT6779D or NCT6791D */
		regval = superio_inb(sioreg, 0x1c);

		fan3pin = !(regval & (1 << 5));
		fan4pin = !(regval & (1 << 6));
		fan5pin = !(regval & (1 << 7));

		pwm3pin = !(regval & (1 << 0));
		pwm4pin = !(regval & (1 << 1));
		pwm5pin = !(regval & (1 << 2));

		fan4min = fan4pin;

		if (data->kind == nct6791) {
			regval = superio_inb(sioreg, 0x2d);
			fan6pin = (regval & (1 << 1));
			pwm6pin = (regval & (1 << 0));
		} else {	/* NCT6779D */
			fan6pin = false;
			pwm6pin = false;
		}
	}

	/* fan 1 and 2 (0x03) are always present */
	data->has_fan = 0x03 | (fan3pin << 2) | (fan4pin << 3) |
		(fan5pin << 4) | (fan6pin << 5);
	data->has_fan_min = 0x03 | (fan3pin << 2) | (fan4min << 3) |
		(fan5pin << 4);
	data->has_pwm = 0x03 | (pwm3pin << 2) | (pwm4pin << 3) |
		(pwm5pin << 4) | (pwm6pin << 5);
}

static void add_temp_sensors(struct nct6775_data *data, const u16 *regp,
			     int *available, int *mask)
{
	int i;
	u8 src;

	for (i = 0; i < data->pwm_num && *available; i++) {
		int index;

		if (!regp[i])
			continue;
		src = nct6775_read_value(data, regp[i]);
		src &= 0x1f;
		if (!src || (*mask & (1 << src)))
			continue;
		if (src >= data->temp_label_num ||
		    !strlen(data->temp_label[src]))
			continue;

		index = __ffs(*available);
		nct6775_write_value(data, data->REG_TEMP_SOURCE[index], src);
		*available &= ~(1 << index);
		*mask |= 1 << src;
	}
}

static int nct6775_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct nct6775_sio_data *sio_data = dev_get_platdata(dev);
	struct nct6775_data *data;
	struct resource *res;
	int i, s, err = 0;
	int src, mask, available;
	const u16 *reg_temp, *reg_temp_over, *reg_temp_hyst, *reg_temp_config;
	const u16 *reg_temp_mon, *reg_temp_alternate, *reg_temp_crit;
	const u16 *reg_temp_crit_l = NULL, *reg_temp_crit_h = NULL;
	int num_reg_temp, num_reg_temp_mon;
	u8 cr2a;
	struct attribute_group *group;
	struct device *hwmon_dev;

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

	data = devm_kzalloc(&pdev->dev, sizeof(struct nct6775_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);
	data->name = nct6775_device_names[data->kind];
	data->bank = 0xff;		/* Force initial bank selection */
	platform_set_drvdata(pdev, data);

	switch (data->kind) {
	case nct6106:
		data->in_num = 9;
		data->pwm_num = 3;
		data->auto_pwm_num = 4;
		data->temp_fixed_num = 3;
		data->num_temp_alarms = 6;
		data->num_temp_beeps = 6;

		data->fan_from_reg = fan_from_reg13;
		data->fan_from_reg_min = fan_from_reg13;

		data->temp_label = nct6776_temp_label;
		data->temp_label_num = ARRAY_SIZE(nct6776_temp_label);

		data->REG_VBAT = NCT6106_REG_VBAT;
		data->REG_DIODE = NCT6106_REG_DIODE;
		data->DIODE_MASK = NCT6106_DIODE_MASK;
		data->REG_VIN = NCT6106_REG_IN;
		data->REG_IN_MINMAX[0] = NCT6106_REG_IN_MIN;
		data->REG_IN_MINMAX[1] = NCT6106_REG_IN_MAX;
		data->REG_TARGET = NCT6106_REG_TARGET;
		data->REG_FAN = NCT6106_REG_FAN;
		data->REG_FAN_MODE = NCT6106_REG_FAN_MODE;
		data->REG_FAN_MIN = NCT6106_REG_FAN_MIN;
		data->REG_FAN_PULSES = NCT6106_REG_FAN_PULSES;
		data->FAN_PULSE_SHIFT = NCT6106_FAN_PULSE_SHIFT;
		data->REG_FAN_TIME[0] = NCT6106_REG_FAN_STOP_TIME;
		data->REG_FAN_TIME[1] = NCT6106_REG_FAN_STEP_UP_TIME;
		data->REG_FAN_TIME[2] = NCT6106_REG_FAN_STEP_DOWN_TIME;
		data->REG_TOLERANCE_H = NCT6106_REG_TOLERANCE_H;
		data->REG_PWM[0] = NCT6106_REG_PWM;
		data->REG_PWM[1] = NCT6106_REG_FAN_START_OUTPUT;
		data->REG_PWM[2] = NCT6106_REG_FAN_STOP_OUTPUT;
		data->REG_PWM[5] = NCT6106_REG_WEIGHT_DUTY_STEP;
		data->REG_PWM[6] = NCT6106_REG_WEIGHT_DUTY_BASE;
		data->REG_PWM_READ = NCT6106_REG_PWM_READ;
		data->REG_PWM_MODE = NCT6106_REG_PWM_MODE;
		data->PWM_MODE_MASK = NCT6106_PWM_MODE_MASK;
		data->REG_AUTO_TEMP = NCT6106_REG_AUTO_TEMP;
		data->REG_AUTO_PWM = NCT6106_REG_AUTO_PWM;
		data->REG_CRITICAL_TEMP = NCT6106_REG_CRITICAL_TEMP;
		data->REG_CRITICAL_TEMP_TOLERANCE
		  = NCT6106_REG_CRITICAL_TEMP_TOLERANCE;
		data->REG_CRITICAL_PWM_ENABLE = NCT6106_REG_CRITICAL_PWM_ENABLE;
		data->CRITICAL_PWM_ENABLE_MASK
		  = NCT6106_CRITICAL_PWM_ENABLE_MASK;
		data->REG_CRITICAL_PWM = NCT6106_REG_CRITICAL_PWM;
		data->REG_TEMP_OFFSET = NCT6106_REG_TEMP_OFFSET;
		data->REG_TEMP_SOURCE = NCT6106_REG_TEMP_SOURCE;
		data->REG_TEMP_SEL = NCT6106_REG_TEMP_SEL;
		data->REG_WEIGHT_TEMP_SEL = NCT6106_REG_WEIGHT_TEMP_SEL;
		data->REG_WEIGHT_TEMP[0] = NCT6106_REG_WEIGHT_TEMP_STEP;
		data->REG_WEIGHT_TEMP[1] = NCT6106_REG_WEIGHT_TEMP_STEP_TOL;
		data->REG_WEIGHT_TEMP[2] = NCT6106_REG_WEIGHT_TEMP_BASE;
		data->REG_ALARM = NCT6106_REG_ALARM;
		data->ALARM_BITS = NCT6106_ALARM_BITS;
		data->REG_BEEP = NCT6106_REG_BEEP;
		data->BEEP_BITS = NCT6106_BEEP_BITS;

		reg_temp = NCT6106_REG_TEMP;
		reg_temp_mon = NCT6106_REG_TEMP_MON;
		num_reg_temp = ARRAY_SIZE(NCT6106_REG_TEMP);
		num_reg_temp_mon = ARRAY_SIZE(NCT6106_REG_TEMP_MON);
		reg_temp_over = NCT6106_REG_TEMP_OVER;
		reg_temp_hyst = NCT6106_REG_TEMP_HYST;
		reg_temp_config = NCT6106_REG_TEMP_CONFIG;
		reg_temp_alternate = NCT6106_REG_TEMP_ALTERNATE;
		reg_temp_crit = NCT6106_REG_TEMP_CRIT;
		reg_temp_crit_l = NCT6106_REG_TEMP_CRIT_L;
		reg_temp_crit_h = NCT6106_REG_TEMP_CRIT_H;

		break;
	case nct6775:
		data->in_num = 9;
		data->pwm_num = 3;
		data->auto_pwm_num = 6;
		data->has_fan_div = true;
		data->temp_fixed_num = 3;
		data->num_temp_alarms = 3;
		data->num_temp_beeps = 3;

		data->ALARM_BITS = NCT6775_ALARM_BITS;
		data->BEEP_BITS = NCT6775_BEEP_BITS;

		data->fan_from_reg = fan_from_reg16;
		data->fan_from_reg_min = fan_from_reg8;
		data->target_temp_mask = 0x7f;
		data->tolerance_mask = 0x0f;
		data->speed_tolerance_limit = 15;

		data->temp_label = nct6775_temp_label;
		data->temp_label_num = ARRAY_SIZE(nct6775_temp_label);

		data->REG_CONFIG = NCT6775_REG_CONFIG;
		data->REG_VBAT = NCT6775_REG_VBAT;
		data->REG_DIODE = NCT6775_REG_DIODE;
		data->DIODE_MASK = NCT6775_DIODE_MASK;
		data->REG_VIN = NCT6775_REG_IN;
		data->REG_IN_MINMAX[0] = NCT6775_REG_IN_MIN;
		data->REG_IN_MINMAX[1] = NCT6775_REG_IN_MAX;
		data->REG_TARGET = NCT6775_REG_TARGET;
		data->REG_FAN = NCT6775_REG_FAN;
		data->REG_FAN_MODE = NCT6775_REG_FAN_MODE;
		data->REG_FAN_MIN = NCT6775_REG_FAN_MIN;
		data->REG_FAN_PULSES = NCT6775_REG_FAN_PULSES;
		data->FAN_PULSE_SHIFT = NCT6775_FAN_PULSE_SHIFT;
		data->REG_FAN_TIME[0] = NCT6775_REG_FAN_STOP_TIME;
		data->REG_FAN_TIME[1] = NCT6775_REG_FAN_STEP_UP_TIME;
		data->REG_FAN_TIME[2] = NCT6775_REG_FAN_STEP_DOWN_TIME;
		data->REG_PWM[0] = NCT6775_REG_PWM;
		data->REG_PWM[1] = NCT6775_REG_FAN_START_OUTPUT;
		data->REG_PWM[2] = NCT6775_REG_FAN_STOP_OUTPUT;
		data->REG_PWM[3] = NCT6775_REG_FAN_MAX_OUTPUT;
		data->REG_PWM[4] = NCT6775_REG_FAN_STEP_OUTPUT;
		data->REG_PWM[5] = NCT6775_REG_WEIGHT_DUTY_STEP;
		data->REG_PWM_READ = NCT6775_REG_PWM_READ;
		data->REG_PWM_MODE = NCT6775_REG_PWM_MODE;
		data->PWM_MODE_MASK = NCT6775_PWM_MODE_MASK;
		data->REG_AUTO_TEMP = NCT6775_REG_AUTO_TEMP;
		data->REG_AUTO_PWM = NCT6775_REG_AUTO_PWM;
		data->REG_CRITICAL_TEMP = NCT6775_REG_CRITICAL_TEMP;
		data->REG_CRITICAL_TEMP_TOLERANCE
		  = NCT6775_REG_CRITICAL_TEMP_TOLERANCE;
		data->REG_TEMP_OFFSET = NCT6775_REG_TEMP_OFFSET;
		data->REG_TEMP_SOURCE = NCT6775_REG_TEMP_SOURCE;
		data->REG_TEMP_SEL = NCT6775_REG_TEMP_SEL;
		data->REG_WEIGHT_TEMP_SEL = NCT6775_REG_WEIGHT_TEMP_SEL;
		data->REG_WEIGHT_TEMP[0] = NCT6775_REG_WEIGHT_TEMP_STEP;
		data->REG_WEIGHT_TEMP[1] = NCT6775_REG_WEIGHT_TEMP_STEP_TOL;
		data->REG_WEIGHT_TEMP[2] = NCT6775_REG_WEIGHT_TEMP_BASE;
		data->REG_ALARM = NCT6775_REG_ALARM;
		data->REG_BEEP = NCT6775_REG_BEEP;

		reg_temp = NCT6775_REG_TEMP;
		reg_temp_mon = NCT6775_REG_TEMP_MON;
		num_reg_temp = ARRAY_SIZE(NCT6775_REG_TEMP);
		num_reg_temp_mon = ARRAY_SIZE(NCT6775_REG_TEMP_MON);
		reg_temp_over = NCT6775_REG_TEMP_OVER;
		reg_temp_hyst = NCT6775_REG_TEMP_HYST;
		reg_temp_config = NCT6775_REG_TEMP_CONFIG;
		reg_temp_alternate = NCT6775_REG_TEMP_ALTERNATE;
		reg_temp_crit = NCT6775_REG_TEMP_CRIT;

		break;
	case nct6776:
		data->in_num = 9;
		data->pwm_num = 3;
		data->auto_pwm_num = 4;
		data->has_fan_div = false;
		data->temp_fixed_num = 3;
		data->num_temp_alarms = 3;
		data->num_temp_beeps = 6;

		data->ALARM_BITS = NCT6776_ALARM_BITS;
		data->BEEP_BITS = NCT6776_BEEP_BITS;

		data->fan_from_reg = fan_from_reg13;
		data->fan_from_reg_min = fan_from_reg13;
		data->target_temp_mask = 0xff;
		data->tolerance_mask = 0x07;
		data->speed_tolerance_limit = 63;

		data->temp_label = nct6776_temp_label;
		data->temp_label_num = ARRAY_SIZE(nct6776_temp_label);

		data->REG_CONFIG = NCT6775_REG_CONFIG;
		data->REG_VBAT = NCT6775_REG_VBAT;
		data->REG_DIODE = NCT6775_REG_DIODE;
		data->DIODE_MASK = NCT6775_DIODE_MASK;
		data->REG_VIN = NCT6775_REG_IN;
		data->REG_IN_MINMAX[0] = NCT6775_REG_IN_MIN;
		data->REG_IN_MINMAX[1] = NCT6775_REG_IN_MAX;
		data->REG_TARGET = NCT6775_REG_TARGET;
		data->REG_FAN = NCT6775_REG_FAN;
		data->REG_FAN_MODE = NCT6775_REG_FAN_MODE;
		data->REG_FAN_MIN = NCT6776_REG_FAN_MIN;
		data->REG_FAN_PULSES = NCT6776_REG_FAN_PULSES;
		data->FAN_PULSE_SHIFT = NCT6775_FAN_PULSE_SHIFT;
		data->REG_FAN_TIME[0] = NCT6775_REG_FAN_STOP_TIME;
		data->REG_FAN_TIME[1] = NCT6776_REG_FAN_STEP_UP_TIME;
		data->REG_FAN_TIME[2] = NCT6776_REG_FAN_STEP_DOWN_TIME;
		data->REG_TOLERANCE_H = NCT6776_REG_TOLERANCE_H;
		data->REG_PWM[0] = NCT6775_REG_PWM;
		data->REG_PWM[1] = NCT6775_REG_FAN_START_OUTPUT;
		data->REG_PWM[2] = NCT6775_REG_FAN_STOP_OUTPUT;
		data->REG_PWM[5] = NCT6775_REG_WEIGHT_DUTY_STEP;
		data->REG_PWM[6] = NCT6776_REG_WEIGHT_DUTY_BASE;
		data->REG_PWM_READ = NCT6775_REG_PWM_READ;
		data->REG_PWM_MODE = NCT6776_REG_PWM_MODE;
		data->PWM_MODE_MASK = NCT6776_PWM_MODE_MASK;
		data->REG_AUTO_TEMP = NCT6775_REG_AUTO_TEMP;
		data->REG_AUTO_PWM = NCT6775_REG_AUTO_PWM;
		data->REG_CRITICAL_TEMP = NCT6775_REG_CRITICAL_TEMP;
		data->REG_CRITICAL_TEMP_TOLERANCE
		  = NCT6775_REG_CRITICAL_TEMP_TOLERANCE;
		data->REG_TEMP_OFFSET = NCT6775_REG_TEMP_OFFSET;
		data->REG_TEMP_SOURCE = NCT6775_REG_TEMP_SOURCE;
		data->REG_TEMP_SEL = NCT6775_REG_TEMP_SEL;
		data->REG_WEIGHT_TEMP_SEL = NCT6775_REG_WEIGHT_TEMP_SEL;
		data->REG_WEIGHT_TEMP[0] = NCT6775_REG_WEIGHT_TEMP_STEP;
		data->REG_WEIGHT_TEMP[1] = NCT6775_REG_WEIGHT_TEMP_STEP_TOL;
		data->REG_WEIGHT_TEMP[2] = NCT6775_REG_WEIGHT_TEMP_BASE;
		data->REG_ALARM = NCT6775_REG_ALARM;
		data->REG_BEEP = NCT6776_REG_BEEP;

		reg_temp = NCT6775_REG_TEMP;
		reg_temp_mon = NCT6775_REG_TEMP_MON;
		num_reg_temp = ARRAY_SIZE(NCT6775_REG_TEMP);
		num_reg_temp_mon = ARRAY_SIZE(NCT6775_REG_TEMP_MON);
		reg_temp_over = NCT6775_REG_TEMP_OVER;
		reg_temp_hyst = NCT6775_REG_TEMP_HYST;
		reg_temp_config = NCT6776_REG_TEMP_CONFIG;
		reg_temp_alternate = NCT6776_REG_TEMP_ALTERNATE;
		reg_temp_crit = NCT6776_REG_TEMP_CRIT;

		break;
	case nct6779:
		data->in_num = 15;
		data->pwm_num = 5;
		data->auto_pwm_num = 4;
		data->has_fan_div = false;
		data->temp_fixed_num = 6;
		data->num_temp_alarms = 2;
		data->num_temp_beeps = 2;

		data->ALARM_BITS = NCT6779_ALARM_BITS;
		data->BEEP_BITS = NCT6779_BEEP_BITS;

		data->fan_from_reg = fan_from_reg13;
		data->fan_from_reg_min = fan_from_reg13;
		data->target_temp_mask = 0xff;
		data->tolerance_mask = 0x07;
		data->speed_tolerance_limit = 63;

		data->temp_label = nct6779_temp_label;
		data->temp_label_num = ARRAY_SIZE(nct6779_temp_label);

		data->REG_CONFIG = NCT6775_REG_CONFIG;
		data->REG_VBAT = NCT6775_REG_VBAT;
		data->REG_DIODE = NCT6775_REG_DIODE;
		data->DIODE_MASK = NCT6775_DIODE_MASK;
		data->REG_VIN = NCT6779_REG_IN;
		data->REG_IN_MINMAX[0] = NCT6775_REG_IN_MIN;
		data->REG_IN_MINMAX[1] = NCT6775_REG_IN_MAX;
		data->REG_TARGET = NCT6775_REG_TARGET;
		data->REG_FAN = NCT6779_REG_FAN;
		data->REG_FAN_MODE = NCT6775_REG_FAN_MODE;
		data->REG_FAN_MIN = NCT6776_REG_FAN_MIN;
		data->REG_FAN_PULSES = NCT6779_REG_FAN_PULSES;
		data->FAN_PULSE_SHIFT = NCT6775_FAN_PULSE_SHIFT;
		data->REG_FAN_TIME[0] = NCT6775_REG_FAN_STOP_TIME;
		data->REG_FAN_TIME[1] = NCT6776_REG_FAN_STEP_UP_TIME;
		data->REG_FAN_TIME[2] = NCT6776_REG_FAN_STEP_DOWN_TIME;
		data->REG_TOLERANCE_H = NCT6776_REG_TOLERANCE_H;
		data->REG_PWM[0] = NCT6775_REG_PWM;
		data->REG_PWM[1] = NCT6775_REG_FAN_START_OUTPUT;
		data->REG_PWM[2] = NCT6775_REG_FAN_STOP_OUTPUT;
		data->REG_PWM[5] = NCT6775_REG_WEIGHT_DUTY_STEP;
		data->REG_PWM[6] = NCT6776_REG_WEIGHT_DUTY_BASE;
		data->REG_PWM_READ = NCT6775_REG_PWM_READ;
		data->REG_PWM_MODE = NCT6776_REG_PWM_MODE;
		data->PWM_MODE_MASK = NCT6776_PWM_MODE_MASK;
		data->REG_AUTO_TEMP = NCT6775_REG_AUTO_TEMP;
		data->REG_AUTO_PWM = NCT6775_REG_AUTO_PWM;
		data->REG_CRITICAL_TEMP = NCT6775_REG_CRITICAL_TEMP;
		data->REG_CRITICAL_TEMP_TOLERANCE
		  = NCT6775_REG_CRITICAL_TEMP_TOLERANCE;
		data->REG_CRITICAL_PWM_ENABLE = NCT6779_REG_CRITICAL_PWM_ENABLE;
		data->CRITICAL_PWM_ENABLE_MASK
		  = NCT6779_CRITICAL_PWM_ENABLE_MASK;
		data->REG_CRITICAL_PWM = NCT6779_REG_CRITICAL_PWM;
		data->REG_TEMP_OFFSET = NCT6779_REG_TEMP_OFFSET;
		data->REG_TEMP_SOURCE = NCT6775_REG_TEMP_SOURCE;
		data->REG_TEMP_SEL = NCT6775_REG_TEMP_SEL;
		data->REG_WEIGHT_TEMP_SEL = NCT6775_REG_WEIGHT_TEMP_SEL;
		data->REG_WEIGHT_TEMP[0] = NCT6775_REG_WEIGHT_TEMP_STEP;
		data->REG_WEIGHT_TEMP[1] = NCT6775_REG_WEIGHT_TEMP_STEP_TOL;
		data->REG_WEIGHT_TEMP[2] = NCT6775_REG_WEIGHT_TEMP_BASE;
		data->REG_ALARM = NCT6779_REG_ALARM;
		data->REG_BEEP = NCT6776_REG_BEEP;

		reg_temp = NCT6779_REG_TEMP;
		reg_temp_mon = NCT6779_REG_TEMP_MON;
		num_reg_temp = ARRAY_SIZE(NCT6779_REG_TEMP);
		num_reg_temp_mon = ARRAY_SIZE(NCT6779_REG_TEMP_MON);
		reg_temp_over = NCT6779_REG_TEMP_OVER;
		reg_temp_hyst = NCT6779_REG_TEMP_HYST;
		reg_temp_config = NCT6779_REG_TEMP_CONFIG;
		reg_temp_alternate = NCT6779_REG_TEMP_ALTERNATE;
		reg_temp_crit = NCT6779_REG_TEMP_CRIT;

		break;
	case nct6791:
		data->in_num = 15;
		data->pwm_num = 6;
		data->auto_pwm_num = 4;
		data->has_fan_div = false;
		data->temp_fixed_num = 6;
		data->num_temp_alarms = 2;
		data->num_temp_beeps = 2;

		data->ALARM_BITS = NCT6791_ALARM_BITS;
		data->BEEP_BITS = NCT6779_BEEP_BITS;

		data->fan_from_reg = fan_from_reg13;
		data->fan_from_reg_min = fan_from_reg13;
		data->target_temp_mask = 0xff;
		data->tolerance_mask = 0x07;
		data->speed_tolerance_limit = 63;

		data->temp_label = nct6779_temp_label;
		data->temp_label_num = ARRAY_SIZE(nct6779_temp_label);

		data->REG_CONFIG = NCT6775_REG_CONFIG;
		data->REG_VBAT = NCT6775_REG_VBAT;
		data->REG_DIODE = NCT6775_REG_DIODE;
		data->DIODE_MASK = NCT6775_DIODE_MASK;
		data->REG_VIN = NCT6779_REG_IN;
		data->REG_IN_MINMAX[0] = NCT6775_REG_IN_MIN;
		data->REG_IN_MINMAX[1] = NCT6775_REG_IN_MAX;
		data->REG_TARGET = NCT6775_REG_TARGET;
		data->REG_FAN = NCT6779_REG_FAN;
		data->REG_FAN_MODE = NCT6775_REG_FAN_MODE;
		data->REG_FAN_MIN = NCT6776_REG_FAN_MIN;
		data->REG_FAN_PULSES = NCT6779_REG_FAN_PULSES;
		data->FAN_PULSE_SHIFT = NCT6775_FAN_PULSE_SHIFT;
		data->REG_FAN_TIME[0] = NCT6775_REG_FAN_STOP_TIME;
		data->REG_FAN_TIME[1] = NCT6776_REG_FAN_STEP_UP_TIME;
		data->REG_FAN_TIME[2] = NCT6776_REG_FAN_STEP_DOWN_TIME;
		data->REG_TOLERANCE_H = NCT6776_REG_TOLERANCE_H;
		data->REG_PWM[0] = NCT6775_REG_PWM;
		data->REG_PWM[1] = NCT6775_REG_FAN_START_OUTPUT;
		data->REG_PWM[2] = NCT6775_REG_FAN_STOP_OUTPUT;
		data->REG_PWM[5] = NCT6791_REG_WEIGHT_DUTY_STEP;
		data->REG_PWM[6] = NCT6791_REG_WEIGHT_DUTY_BASE;
		data->REG_PWM_READ = NCT6775_REG_PWM_READ;
		data->REG_PWM_MODE = NCT6776_REG_PWM_MODE;
		data->PWM_MODE_MASK = NCT6776_PWM_MODE_MASK;
		data->REG_AUTO_TEMP = NCT6775_REG_AUTO_TEMP;
		data->REG_AUTO_PWM = NCT6775_REG_AUTO_PWM;
		data->REG_CRITICAL_TEMP = NCT6775_REG_CRITICAL_TEMP;
		data->REG_CRITICAL_TEMP_TOLERANCE
		  = NCT6775_REG_CRITICAL_TEMP_TOLERANCE;
		data->REG_CRITICAL_PWM_ENABLE = NCT6779_REG_CRITICAL_PWM_ENABLE;
		data->CRITICAL_PWM_ENABLE_MASK
		  = NCT6779_CRITICAL_PWM_ENABLE_MASK;
		data->REG_CRITICAL_PWM = NCT6779_REG_CRITICAL_PWM;
		data->REG_TEMP_OFFSET = NCT6779_REG_TEMP_OFFSET;
		data->REG_TEMP_SOURCE = NCT6775_REG_TEMP_SOURCE;
		data->REG_TEMP_SEL = NCT6775_REG_TEMP_SEL;
		data->REG_WEIGHT_TEMP_SEL = NCT6791_REG_WEIGHT_TEMP_SEL;
		data->REG_WEIGHT_TEMP[0] = NCT6791_REG_WEIGHT_TEMP_STEP;
		data->REG_WEIGHT_TEMP[1] = NCT6791_REG_WEIGHT_TEMP_STEP_TOL;
		data->REG_WEIGHT_TEMP[2] = NCT6791_REG_WEIGHT_TEMP_BASE;
		data->REG_ALARM = NCT6791_REG_ALARM;
		data->REG_BEEP = NCT6776_REG_BEEP;

		reg_temp = NCT6779_REG_TEMP;
		reg_temp_mon = NCT6779_REG_TEMP_MON;
		num_reg_temp = ARRAY_SIZE(NCT6779_REG_TEMP);
		num_reg_temp_mon = ARRAY_SIZE(NCT6779_REG_TEMP_MON);
		reg_temp_over = NCT6779_REG_TEMP_OVER;
		reg_temp_hyst = NCT6779_REG_TEMP_HYST;
		reg_temp_config = NCT6779_REG_TEMP_CONFIG;
		reg_temp_alternate = NCT6779_REG_TEMP_ALTERNATE;
		reg_temp_crit = NCT6779_REG_TEMP_CRIT;

		break;
	default:
		return -ENODEV;
	}
	data->have_in = (1 << data->in_num) - 1;
	data->have_temp = 0;

	/*
	 * On some boards, not all available temperature sources are monitored,
	 * even though some of the monitoring registers are unused.
	 * Get list of unused monitoring registers, then detect if any fan
	 * controls are configured to use unmonitored temperature sources.
	 * If so, assign the unmonitored temperature sources to available
	 * monitoring registers.
	 */
	mask = 0;
	available = 0;
	for (i = 0; i < num_reg_temp; i++) {
		if (reg_temp[i] == 0)
			continue;

		src = nct6775_read_value(data, data->REG_TEMP_SOURCE[i]) & 0x1f;
		if (!src || (mask & (1 << src)))
			available |= 1 << i;

		mask |= 1 << src;
	}

	/*
	 * Now find unmonitored temperature registers and enable monitoring
	 * if additional monitoring registers are available.
	 */
	add_temp_sensors(data, data->REG_TEMP_SEL, &available, &mask);
	add_temp_sensors(data, data->REG_WEIGHT_TEMP_SEL, &available, &mask);

	mask = 0;
	s = NUM_TEMP_FIXED;	/* First dynamic temperature attribute */
	for (i = 0; i < num_reg_temp; i++) {
		if (reg_temp[i] == 0)
			continue;

		src = nct6775_read_value(data, data->REG_TEMP_SOURCE[i]) & 0x1f;
		if (!src || (mask & (1 << src)))
			continue;

		if (src >= data->temp_label_num ||
		    !strlen(data->temp_label[src])) {
			dev_info(dev,
				 "Invalid temperature source %d at index %d, source register 0x%x, temp register 0x%x\n",
				 src, i, data->REG_TEMP_SOURCE[i], reg_temp[i]);
			continue;
		}

		mask |= 1 << src;

		/* Use fixed index for SYSTIN(1), CPUTIN(2), AUXTIN(3) */
		if (src <= data->temp_fixed_num) {
			data->have_temp |= 1 << (src - 1);
			data->have_temp_fixed |= 1 << (src - 1);
			data->reg_temp[0][src - 1] = reg_temp[i];
			data->reg_temp[1][src - 1] = reg_temp_over[i];
			data->reg_temp[2][src - 1] = reg_temp_hyst[i];
			if (reg_temp_crit_h && reg_temp_crit_h[i])
				data->reg_temp[3][src - 1] = reg_temp_crit_h[i];
			else if (reg_temp_crit[src - 1])
				data->reg_temp[3][src - 1]
				  = reg_temp_crit[src - 1];
			if (reg_temp_crit_l && reg_temp_crit_l[i])
				data->reg_temp[4][src - 1] = reg_temp_crit_l[i];
			data->reg_temp_config[src - 1] = reg_temp_config[i];
			data->temp_src[src - 1] = src;
			continue;
		}

		if (s >= NUM_TEMP)
			continue;

		/* Use dynamic index for other sources */
		data->have_temp |= 1 << s;
		data->reg_temp[0][s] = reg_temp[i];
		data->reg_temp[1][s] = reg_temp_over[i];
		data->reg_temp[2][s] = reg_temp_hyst[i];
		data->reg_temp_config[s] = reg_temp_config[i];
		if (reg_temp_crit_h && reg_temp_crit_h[i])
			data->reg_temp[3][s] = reg_temp_crit_h[i];
		else if (reg_temp_crit[src - 1])
			data->reg_temp[3][s] = reg_temp_crit[src - 1];
		if (reg_temp_crit_l && reg_temp_crit_l[i])
			data->reg_temp[4][s] = reg_temp_crit_l[i];

		data->temp_src[s] = src;
		s++;
	}

	/*
	 * Repeat with temperatures used for fan control.
	 * This set of registers does not support limits.
	 */
	for (i = 0; i < num_reg_temp_mon; i++) {
		if (reg_temp_mon[i] == 0)
			continue;

		src = nct6775_read_value(data, data->REG_TEMP_SEL[i]) & 0x1f;
		if (!src || (mask & (1 << src)))
			continue;

		if (src >= data->temp_label_num ||
		    !strlen(data->temp_label[src])) {
			dev_info(dev,
				 "Invalid temperature source %d at index %d, source register 0x%x, temp register 0x%x\n",
				 src, i, data->REG_TEMP_SEL[i],
				 reg_temp_mon[i]);
			continue;
		}

		mask |= 1 << src;

		/* Use fixed index for SYSTIN(1), CPUTIN(2), AUXTIN(3) */
		if (src <= data->temp_fixed_num) {
			if (data->have_temp & (1 << (src - 1)))
				continue;
			data->have_temp |= 1 << (src - 1);
			data->have_temp_fixed |= 1 << (src - 1);
			data->reg_temp[0][src - 1] = reg_temp_mon[i];
			data->temp_src[src - 1] = src;
			continue;
		}

		if (s >= NUM_TEMP)
			continue;

		/* Use dynamic index for other sources */
		data->have_temp |= 1 << s;
		data->reg_temp[0][s] = reg_temp_mon[i];
		data->temp_src[s] = src;
		s++;
	}

#ifdef USE_ALTERNATE
	/*
	 * Go through the list of alternate temp registers and enable
	 * if possible.
	 * The temperature is already monitored if the respective bit in <mask>
	 * is set.
	 */
	for (i = 0; i < data->temp_label_num - 1; i++) {
		if (!reg_temp_alternate[i])
			continue;
		if (mask & (1 << (i + 1)))
			continue;
		if (i < data->temp_fixed_num) {
			if (data->have_temp & (1 << i))
				continue;
			data->have_temp |= 1 << i;
			data->have_temp_fixed |= 1 << i;
			data->reg_temp[0][i] = reg_temp_alternate[i];
			if (i < num_reg_temp) {
				data->reg_temp[1][i] = reg_temp_over[i];
				data->reg_temp[2][i] = reg_temp_hyst[i];
			}
			data->temp_src[i] = i + 1;
			continue;
		}

		if (s >= NUM_TEMP)	/* Abort if no more space */
			break;

		data->have_temp |= 1 << s;
		data->reg_temp[0][s] = reg_temp_alternate[i];
		data->temp_src[s] = i + 1;
		s++;
	}
#endif /* USE_ALTERNATE */

	/* Initialize the chip */
	nct6775_init_device(data);

	err = superio_enter(sio_data->sioreg);
	if (err)
		return err;

	cr2a = superio_inb(sio_data->sioreg, 0x2a);
	switch (data->kind) {
	case nct6775:
		data->have_vid = (cr2a & 0x40);
		break;
	case nct6776:
		data->have_vid = (cr2a & 0x60) == 0x40;
		break;
	case nct6106:
	case nct6779:
	case nct6791:
		break;
	}

	/*
	 * Read VID value
	 * We can get the VID input values directly at logical device D 0xe3.
	 */
	if (data->have_vid) {
		superio_select(sio_data->sioreg, NCT6775_LD_VID);
		data->vid = superio_inb(sio_data->sioreg, 0xe3);
		data->vrm = vid_which_vrm();
	}

	if (fan_debounce) {
		u8 tmp;

		superio_select(sio_data->sioreg, NCT6775_LD_HWM);
		tmp = superio_inb(sio_data->sioreg,
				  NCT6775_REG_CR_FAN_DEBOUNCE);
		switch (data->kind) {
		case nct6106:
			tmp |= 0xe0;
			break;
		case nct6775:
			tmp |= 0x1e;
			break;
		case nct6776:
		case nct6779:
			tmp |= 0x3e;
			break;
		case nct6791:
			tmp |= 0x7e;
			break;
		}
		superio_outb(sio_data->sioreg, NCT6775_REG_CR_FAN_DEBOUNCE,
			     tmp);
		dev_info(&pdev->dev, "Enabled fan debounce for chip %s\n",
			 data->name);
	}

	nct6775_check_fan_inputs(data);

	superio_exit(sio_data->sioreg);

	/* Read fan clock dividers immediately */
	nct6775_init_fan_common(dev, data);

	/* Register sysfs hooks */
	group = nct6775_create_attr_group(dev, &nct6775_pwm_template_group,
					  data->pwm_num);
	if (IS_ERR(group))
		return PTR_ERR(group);

	data->groups[data->num_attr_groups++] = group;

	group = nct6775_create_attr_group(dev, &nct6775_in_template_group,
					  fls(data->have_in));
	if (IS_ERR(group))
		return PTR_ERR(group);

	data->groups[data->num_attr_groups++] = group;

	group = nct6775_create_attr_group(dev, &nct6775_fan_template_group,
					  fls(data->has_fan));
	if (IS_ERR(group))
		return PTR_ERR(group);

	data->groups[data->num_attr_groups++] = group;

	group = nct6775_create_attr_group(dev, &nct6775_temp_template_group,
					  fls(data->have_temp));
	if (IS_ERR(group))
		return PTR_ERR(group);

	data->groups[data->num_attr_groups++] = group;
	data->groups[data->num_attr_groups++] = &nct6775_group_other;

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, data->name,
							   data, data->groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
}

static void nct6791_enable_io_mapping(int sioaddr)
{
	int val;

	val = superio_inb(sioaddr, NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE);
	if (val & 0x10) {
		pr_info("Enabling hardware monitor logical device mappings.\n");
		superio_outb(sioaddr, NCT6791_REG_HM_IO_SPACE_LOCK_ENABLE,
			     val & ~0x10);
	}
}

#ifdef CONFIG_PM
static int nct6775_suspend(struct device *dev)
{
	struct nct6775_data *data = nct6775_update_device(dev);

	mutex_lock(&data->update_lock);
	data->vbat = nct6775_read_value(data, data->REG_VBAT);
	if (data->kind == nct6775) {
		data->fandiv1 = nct6775_read_value(data, NCT6775_REG_FANDIV1);
		data->fandiv2 = nct6775_read_value(data, NCT6775_REG_FANDIV2);
	}
	mutex_unlock(&data->update_lock);

	return 0;
}

static int nct6775_resume(struct device *dev)
{
	struct nct6775_data *data = dev_get_drvdata(dev);
	int i, j, err = 0;

	mutex_lock(&data->update_lock);
	data->bank = 0xff;		/* Force initial bank selection */

	if (data->kind == nct6791) {
		err = superio_enter(data->sioreg);
		if (err)
			goto abort;

		nct6791_enable_io_mapping(data->sioreg);
		superio_exit(data->sioreg);
	}

	/* Restore limits */
	for (i = 0; i < data->in_num; i++) {
		if (!(data->have_in & (1 << i)))
			continue;

		nct6775_write_value(data, data->REG_IN_MINMAX[0][i],
				    data->in[i][1]);
		nct6775_write_value(data, data->REG_IN_MINMAX[1][i],
				    data->in[i][2]);
	}

	for (i = 0; i < ARRAY_SIZE(data->fan_min); i++) {
		if (!(data->has_fan_min & (1 << i)))
			continue;

		nct6775_write_value(data, data->REG_FAN_MIN[i],
				    data->fan_min[i]);
	}

	for (i = 0; i < NUM_TEMP; i++) {
		if (!(data->have_temp & (1 << i)))
			continue;

		for (j = 1; j < ARRAY_SIZE(data->reg_temp); j++)
			if (data->reg_temp[j][i])
				nct6775_write_temp(data, data->reg_temp[j][i],
						   data->temp[j][i]);
	}

	/* Restore other settings */
	nct6775_write_value(data, data->REG_VBAT, data->vbat);
	if (data->kind == nct6775) {
		nct6775_write_value(data, NCT6775_REG_FANDIV1, data->fandiv1);
		nct6775_write_value(data, NCT6775_REG_FANDIV2, data->fandiv2);
	}

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

	return err;
}

static const struct dev_pm_ops nct6775_dev_pm_ops = {
	.suspend = nct6775_suspend,
	.resume = nct6775_resume,
	.freeze = nct6775_suspend,
	.restore = nct6775_resume,
};

#define NCT6775_DEV_PM_OPS	(&nct6775_dev_pm_ops)
#else
#define NCT6775_DEV_PM_OPS	NULL
#endif /* CONFIG_PM */

static struct platform_driver nct6775_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= DRVNAME,
		.pm	= NCT6775_DEV_PM_OPS,
	},
	.probe		= nct6775_probe,
};

static const char * const nct6775_sio_names[] __initconst = {
	"NCT6106D",
	"NCT6775F",
	"NCT6776D/F",
	"NCT6779D",
	"NCT6791D",
};

/* nct6775_find() looks for a '627 in the Super-I/O config space */
static int __init nct6775_find(int sioaddr, struct nct6775_sio_data *sio_data)
{
	u16 val;
	int err;
	int addr;

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

	if (force_id)
		val = force_id;
	else
		val = (superio_inb(sioaddr, SIO_REG_DEVID) << 8)
		    | superio_inb(sioaddr, SIO_REG_DEVID + 1);
	switch (val & SIO_ID_MASK) {
	case SIO_NCT6106_ID:
		sio_data->kind = nct6106;
		break;
	case SIO_NCT6775_ID:
		sio_data->kind = nct6775;
		break;
	case SIO_NCT6776_ID:
		sio_data->kind = nct6776;
		break;
	case SIO_NCT6779_ID:
		sio_data->kind = nct6779;
		break;
	case SIO_NCT6791_ID:
		sio_data->kind = nct6791;
		break;
	default:
		if (val != 0xffff)
			pr_debug("unsupported chip ID: 0x%04x\n", val);
		superio_exit(sioaddr);
		return -ENODEV;
	}

	/* We have a known chip, find the HWM I/O address */
	superio_select(sioaddr, NCT6775_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("Refusing to enable a Super-I/O device with a base I/O port 0\n");
		superio_exit(sioaddr);
		return -ENODEV;
	}

	/* Activate logical device if needed */
	val = superio_inb(sioaddr, SIO_REG_ENABLE);
	if (!(val & 0x01)) {
		pr_warn("Forcibly enabling Super-I/O. Sensor is probably unusable.\n");
		superio_outb(sioaddr, SIO_REG_ENABLE, val | 0x01);
	}

	if (sio_data->kind == nct6791)
		nct6791_enable_io_mapping(sioaddr);

	superio_exit(sioaddr);
	pr_info("Found %s or compatible chip at %#x:%#x\n",
		nct6775_sio_names[sio_data->kind], sioaddr, addr);
	sio_data->sioreg = sioaddr;

	return addr;
}

/*
 * 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 nct6775 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_nct6775_init(void)
{
	int i, err;
	bool found = false;
	int address;
	struct resource res;
	struct nct6775_sio_data sio_data;
	int sioaddr[2] = { 0x2e, 0x4e };

	err = platform_driver_register(&nct6775_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
	 * nct6775 hardware monitor, and call probe()
	 */
	for (i = 0; i < ARRAY_SIZE(pdev); i++) {
		address = nct6775_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 nct6775_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(&nct6775_driver);
	return err;
}

static void __exit sensors_nct6775_exit(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(pdev); i++) {
		if (pdev[i])
			platform_device_unregister(pdev[i]);
	}
	platform_driver_unregister(&nct6775_driver);
}

MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
MODULE_DESCRIPTION("NCT6775F/NCT6776F/NCT6779D driver");
MODULE_LICENSE("GPL");

module_init(sensors_nct6775_init);
module_exit(sensors_nct6775_exit);