w83627ehf.c

/*
    w83627ehf - Driver for the hardware monitoring functionality of
		the Winbond W83627EHF Super-I/O chip
    Copyright (C) 2005  Jean Delvare <khali@linux-fr.org>
    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

    Thanks to Leon Moonen, Steve Cliffe and Grant Coady for their help
    in testing and debugging this driver.

    This driver also supports the W83627EHG, which is the lead-free
    version of the W83627EHF.

    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
    w83627ehf   10      5       4       3      0x8850 0x88    0x5ca3
					       0x8860 0xa1
    w83627dhg    9      5       4       3      0xa020 0xc1    0x5ca3
    w83627dhg-p  9      5       4       3      0xb070 0xc1    0x5ca3
    w83667hg     9      5       3       3      0xa510 0xc1    0x5ca3
    w83667hg-b   9      5       3       4      0xb350 0xc1    0x5ca3
    nct6775f     9      4       3       9      0xb470 0xc1    0x5ca3
    nct6776f     9      5       3       9      0xC330 0xc1    0x5ca3
*/

#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 "lm75.h"

enum kinds { w83627ehf, w83627dhg, w83627dhg_p, w83667hg, w83667hg_b, nct6775,
	nct6776 };

/* used to set data->name = w83627ehf_device_names[data->sio_kind] */
static const char * const w83627ehf_device_names[] = {
	"w83627ehf",
	"w83627dhg",
	"w83627dhg",
	"w83667hg",
	"w83667hg",
	"nct6775",
	"nct6776",
};

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 "w83627ehf"

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

#define W83627EHF_LD_HWM	0x0b
#define W83667HG_LD_VID		0x0d

#define SIO_REG_LDSEL		0x07	/* Logical device select */
#define SIO_REG_DEVID		0x20	/* Device ID (2 bytes) */
#define SIO_REG_EN_VRM10	0x2C	/* GPIO3, GPIO4 selection */
#define SIO_REG_ENABLE		0x30	/* Logical device enable */
#define SIO_REG_ADDR		0x60	/* Logical device address (2 bytes) */
#define SIO_REG_VID_CTRL	0xF0	/* VID control */
#define SIO_REG_VID_DATA	0xF1	/* VID data */

#define SIO_W83627EHF_ID	0x8850
#define SIO_W83627EHG_ID	0x8860
#define SIO_W83627DHG_ID	0xa020
#define SIO_W83627DHG_P_ID	0xb070
#define SIO_W83667HG_ID		0xa510
#define SIO_W83667HG_B_ID	0xb350
#define SIO_NCT6775_ID		0xb470
#define SIO_NCT6776_ID		0xc330
#define SIO_ID_MASK		0xFFF0

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

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

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

static inline void
superio_enter(int ioreg)
{
	outb(0x87, ioreg);
	outb(0x87, ioreg);
}

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

/*
 * 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 W83627EHF_REG_BANK		0x4E
#define W83627EHF_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 */

static const u16 W83627EHF_REG_FAN[] = { 0x28, 0x29, 0x2a, 0x3f, 0x553 };
static const u16 W83627EHF_REG_FAN_MIN[] = { 0x3b, 0x3c, 0x3d, 0x3e, 0x55c };

/* The W83627EHF registers for nr=7,8,9 are in bank 5 */
#define W83627EHF_REG_IN_MAX(nr)	((nr < 7) ? (0x2b + (nr) * 2) : \
					 (0x554 + (((nr) - 7) * 2)))
#define W83627EHF_REG_IN_MIN(nr)	((nr < 7) ? (0x2c + (nr) * 2) : \
					 (0x555 + (((nr) - 7) * 2)))
#define W83627EHF_REG_IN(nr)		((nr < 7) ? (0x20 + (nr)) : \
					 (0x550 + (nr) - 7))

static const u16 W83627EHF_REG_TEMP[] = { 0x27, 0x150, 0x250, 0x7e };
static const u16 W83627EHF_REG_TEMP_HYST[] = { 0x3a, 0x153, 0x253, 0 };
static const u16 W83627EHF_REG_TEMP_OVER[] = { 0x39, 0x155, 0x255, 0 };
static const u16 W83627EHF_REG_TEMP_CONFIG[] = { 0, 0x152, 0x252, 0 };

/* Fan clock dividers are spread over the following five registers */
#define W83627EHF_REG_FANDIV1		0x47
#define W83627EHF_REG_FANDIV2		0x4B
#define W83627EHF_REG_VBAT		0x5D
#define W83627EHF_REG_DIODE		0x59
#define W83627EHF_REG_SMI_OVT		0x4C

/* NCT6775F has its own fan divider registers */
#define NCT6775_REG_FANDIV1		0x506
#define NCT6775_REG_FANDIV2		0x507
#define NCT6775_REG_FAN_DEBOUNCE	0xf0

#define W83627EHF_REG_ALARM1		0x459
#define W83627EHF_REG_ALARM2		0x45A
#define W83627EHF_REG_ALARM3		0x45B

#define W83627EHF_REG_CASEOPEN_DET	0x42 /* SMI STATUS #2 */
#define W83627EHF_REG_CASEOPEN_CLR	0x46 /* SMI MASK #3 */

/* SmartFan registers */
#define W83627EHF_REG_FAN_STEPUP_TIME 0x0f
#define W83627EHF_REG_FAN_STEPDOWN_TIME 0x0e

/* DC or PWM output fan configuration */
static const u8 W83627EHF_REG_PWM_ENABLE[] = {
	0x04,			/* SYS FAN0 output mode and PWM mode */
	0x04,			/* CPU FAN0 output mode and PWM mode */
	0x12,			/* AUX FAN mode */
	0x62,			/* CPU FAN1 mode */
};

static const u8 W83627EHF_PWM_MODE_SHIFT[] = { 0, 1, 0, 6 };
static const u8 W83627EHF_PWM_ENABLE_SHIFT[] = { 2, 4, 1, 4 };

/* FAN Duty Cycle, be used to control */
static const u16 W83627EHF_REG_PWM[] = { 0x01, 0x03, 0x11, 0x61 };
static const u16 W83627EHF_REG_TARGET[] = { 0x05, 0x06, 0x13, 0x63 };
static const u8 W83627EHF_REG_TOLERANCE[] = { 0x07, 0x07, 0x14, 0x62 };

/* Advanced Fan control, some values are common for all fans */
static const u16 W83627EHF_REG_FAN_START_OUTPUT[] = { 0x0a, 0x0b, 0x16, 0x65 };
static const u16 W83627EHF_REG_FAN_STOP_OUTPUT[] = { 0x08, 0x09, 0x15, 0x64 };
static const u16 W83627EHF_REG_FAN_STOP_TIME[] = { 0x0c, 0x0d, 0x17, 0x66 };

static const u16 W83627EHF_REG_FAN_MAX_OUTPUT_COMMON[]
						= { 0xff, 0x67, 0xff, 0x69 };
static const u16 W83627EHF_REG_FAN_STEP_OUTPUT_COMMON[]
						= { 0xff, 0x68, 0xff, 0x6a };

static const u16 W83627EHF_REG_FAN_MAX_OUTPUT_W83667_B[] = { 0x67, 0x69, 0x6b };
static const u16 W83627EHF_REG_FAN_STEP_OUTPUT_W83667_B[]
						= { 0x68, 0x6a, 0x6c };

static const u16 NCT6775_REG_TARGET[] = { 0x101, 0x201, 0x301 };
static const u16 NCT6775_REG_FAN_MODE[] = { 0x102, 0x202, 0x302 };
static const u16 NCT6775_REG_FAN_STOP_OUTPUT[] = { 0x105, 0x205, 0x305 };
static const u16 NCT6775_REG_FAN_START_OUTPUT[] = { 0x106, 0x206, 0x306 };
static const u16 NCT6775_REG_FAN_STOP_TIME[] = { 0x107, 0x207, 0x307 };
static const u16 NCT6775_REG_PWM[] = { 0x109, 0x209, 0x309 };
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[] = { 0x630, 0x632, 0x634, 0x636, 0x638 };
static const u16 NCT6776_REG_FAN_MIN[] = { 0x63a, 0x63c, 0x63e, 0x640, 0x642};

static const u16 NCT6775_REG_TEMP[]
	= { 0x27, 0x150, 0x250, 0x73, 0x75, 0x77, 0x62b, 0x62c, 0x62d };
static const u16 NCT6775_REG_TEMP_CONFIG[]
	= { 0, 0x152, 0x252, 0, 0, 0, 0x628, 0x629, 0x62A };
static const u16 NCT6775_REG_TEMP_HYST[]
	= { 0x3a, 0x153, 0x253, 0, 0, 0, 0x673, 0x678, 0x67D };
static const u16 NCT6775_REG_TEMP_OVER[]
	= { 0x39, 0x155, 0x255, 0, 0, 0, 0x672, 0x677, 0x67C };
static const u16 NCT6775_REG_TEMP_SOURCE[]
	= { 0x621, 0x622, 0x623, 0x100, 0x200, 0x300, 0x624, 0x625, 0x626 };

static const char *const w83667hg_b_temp_label[] = {
	"SYSTIN",
	"CPUTIN",
	"AUXTIN",
	"AMDTSI",
	"PECI Agent 1",
	"PECI Agent 2",
	"PECI Agent 3",
	"PECI Agent 4"
};

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 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"
};

#define NUM_REG_TEMP	ARRAY_SIZE(NCT6775_REG_TEMP)

static inline int is_word_sized(u16 reg)
{
	return ((((reg & 0xff00) == 0x100
	      || (reg & 0xff00) == 0x200)
	     && ((reg & 0x00ff) == 0x50
	      || (reg & 0x00ff) == 0x53
	      || (reg & 0x00ff) == 0x55))
	     || (reg & 0xfff0) == 0x630
	     || reg == 0x640 || reg == 0x642
	     || ((reg & 0xfff0) == 0x650
		 && (reg & 0x000f) >= 0x06)
	     || reg == 0x73 || reg == 0x75 || reg == 0x77
		);
}

/*
 * Conversions
 */

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

static inline u8 step_time_to_reg(unsigned int msec, u8 mode)
{
	return SENSORS_LIMIT((mode ? (msec + 50) / 100 :
						(msec + 200) / 400), 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 inline unsigned int
div_from_reg(u8 reg)
{
	return 1 << reg;
}

static inline int
temp_from_reg(u16 reg, s16 regval)
{
	if (is_word_sized(reg))
		return LM75_TEMP_FROM_REG(regval);
	return ((s8)regval) * 1000;
}

static inline u16
temp_to_reg(u16 reg, long temp)
{
	if (is_word_sized(reg))
		return LM75_TEMP_TO_REG(temp);
	return (s8)DIV_ROUND_CLOSEST(SENSORS_LIMIT(temp, -127000, 128000),
				     1000);
}

/* Some of analog inputs have internal scaling (2x), 8mV is ADC LSB */

static u8 scale_in[10] = { 8, 8, 16, 16, 8, 8, 8, 16, 16, 8 };

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

static inline u8 in_to_reg(u32 val, u8 nr)
{
	return SENSORS_LIMIT(((val + (scale_in[nr] / 2)) / scale_in[nr]), 0,
			     255);
}

/*
 * Data structures and manipulation thereof
 */

struct w83627ehf_data {
	int addr;	/* IO base of hw monitor block */
	const char *name;

	struct device *hwmon_dev;
	struct mutex lock;

	u16 reg_temp[NUM_REG_TEMP];
	u16 reg_temp_over[NUM_REG_TEMP];
	u16 reg_temp_hyst[NUM_REG_TEMP];
	u16 reg_temp_config[NUM_REG_TEMP];
	u8 temp_src[NUM_REG_TEMP];
	const char * const *temp_label;

	const u16 *REG_PWM;
	const u16 *REG_TARGET;
	const u16 *REG_FAN;
	const u16 *REG_FAN_MIN;
	const u16 *REG_FAN_START_OUTPUT;
	const u16 *REG_FAN_STOP_OUTPUT;
	const u16 *REG_FAN_STOP_TIME;
	const u16 *REG_FAN_MAX_OUTPUT;
	const u16 *REG_FAN_STEP_OUTPUT;

	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;
	char valid;		/* !=0 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[10];		/* Register value */
	u8 in_max[10];		/* Register value */
	u8 in_min[10];		/* Register value */
	unsigned int rpm[5];
	u16 fan_min[5];
	u8 fan_div[5];
	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 temp_type[3];
	s16 temp[9];
	s16 temp_max[9];
	s16 temp_max_hyst[9];
	u32 alarms;
	u8 caseopen;

	u8 pwm_mode[4]; /* 0->DC variable voltage, 1->PWM variable duty cycle */
	u8 pwm_enable[4]; /* 1->manual
			     2->thermal cruise mode (also called SmartFan I)
			     3->fan speed cruise mode
			     4->variable thermal cruise (also called
				SmartFan III)
			     5->enhanced variable thermal cruise (also called
				SmartFan IV) */
	u8 pwm_enable_orig[4];	/* original value of pwm_enable */
	u8 pwm_num;		/* number of pwm */
	u8 pwm[4];
	u8 target_temp[4];
	u8 tolerance[4];

	u8 fan_start_output[4]; /* minimum fan speed when spinning up */
	u8 fan_stop_output[4]; /* minimum fan speed when spinning down */
	u8 fan_stop_time[4]; /* time at minimum before disabling fan */
	u8 fan_max_output[4]; /* maximum fan speed */
	u8 fan_step_output[4]; /* rate of change output value */

	u8 vid;
	u8 vrm;

	u16 have_temp;
	u8 in6_skip;
};

struct w83627ehf_sio_data {
	int sioreg;
	enum kinds kind;
};

/*
 * 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 w83627ehf_set_bank(struct w83627ehf_data *data, u16 reg)
{
	u8 bank = reg >> 8;
	if (data->bank != bank) {
		outb_p(W83627EHF_REG_BANK, data->addr + ADDR_REG_OFFSET);
		outb_p(bank, data->addr + DATA_REG_OFFSET);
		data->bank = bank;
	}
}

static u16 w83627ehf_read_value(struct w83627ehf_data *data, u16 reg)
{
	int res, word_sized = is_word_sized(reg);

	mutex_lock(&data->lock);

	w83627ehf_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);
	}

	mutex_unlock(&data->lock);
	return res;
}

static int w83627ehf_write_value(struct w83627ehf_data *data, u16 reg,
				 u16 value)
{
	int word_sized = is_word_sized(reg);

	mutex_lock(&data->lock);

	w83627ehf_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);

	mutex_unlock(&data->lock);
	return 0;
}

/* This function assumes that the caller holds data->update_lock */
static void nct6775_write_fan_div(struct w83627ehf_data *data, int nr)
{
	u8 reg;

	switch (nr) {
	case 0:
		reg = (w83627ehf_read_value(data, NCT6775_REG_FANDIV1) & 0x70)
		    | (data->fan_div[0] & 0x7);
		w83627ehf_write_value(data, NCT6775_REG_FANDIV1, reg);
		break;
	case 1:
		reg = (w83627ehf_read_value(data, NCT6775_REG_FANDIV1) & 0x7)
		    | ((data->fan_div[1] << 4) & 0x70);
		w83627ehf_write_value(data, NCT6775_REG_FANDIV1, reg);
	case 2:
		reg = (w83627ehf_read_value(data, NCT6775_REG_FANDIV2) & 0x70)
		    | (data->fan_div[2] & 0x7);
		w83627ehf_write_value(data, NCT6775_REG_FANDIV2, reg);
		break;
	case 3:
		reg = (w83627ehf_read_value(data, NCT6775_REG_FANDIV2) & 0x7)
		    | ((data->fan_div[3] << 4) & 0x70);
		w83627ehf_write_value(data, NCT6775_REG_FANDIV2, reg);
		break;
	}
}

/* This function assumes that the caller holds data->update_lock */
static void w83627ehf_write_fan_div(struct w83627ehf_data *data, int nr)
{
	u8 reg;

	switch (nr) {
	case 0:
		reg = (w83627ehf_read_value(data, W83627EHF_REG_FANDIV1) & 0xcf)
		    | ((data->fan_div[0] & 0x03) << 4);
		/* fan5 input control bit is write only, compute the value */
		reg |= (data->has_fan & (1 << 4)) ? 1 : 0;
		w83627ehf_write_value(data, W83627EHF_REG_FANDIV1, reg);
		reg = (w83627ehf_read_value(data, W83627EHF_REG_VBAT) & 0xdf)
		    | ((data->fan_div[0] & 0x04) << 3);
		w83627ehf_write_value(data, W83627EHF_REG_VBAT, reg);
		break;
	case 1:
		reg = (w83627ehf_read_value(data, W83627EHF_REG_FANDIV1) & 0x3f)
		    | ((data->fan_div[1] & 0x03) << 6);
		/* fan5 input control bit is write only, compute the value */
		reg |= (data->has_fan & (1 << 4)) ? 1 : 0;
		w83627ehf_write_value(data, W83627EHF_REG_FANDIV1, reg);
		reg = (w83627ehf_read_value(data, W83627EHF_REG_VBAT) & 0xbf)
		    | ((data->fan_div[1] & 0x04) << 4);
		w83627ehf_write_value(data, W83627EHF_REG_VBAT, reg);
		break;
	case 2:
		reg = (w83627ehf_read_value(data, W83627EHF_REG_FANDIV2) & 0x3f)
		    | ((data->fan_div[2] & 0x03) << 6);
		w83627ehf_write_value(data, W83627EHF_REG_FANDIV2, reg);
		reg = (w83627ehf_read_value(data, W83627EHF_REG_VBAT) & 0x7f)
		    | ((data->fan_div[2] & 0x04) << 5);
		w83627ehf_write_value(data, W83627EHF_REG_VBAT, reg);
		break;
	case 3:
		reg = (w83627ehf_read_value(data, W83627EHF_REG_DIODE) & 0xfc)
		    | (data->fan_div[3] & 0x03);
		w83627ehf_write_value(data, W83627EHF_REG_DIODE, reg);
		reg = (w83627ehf_read_value(data, W83627EHF_REG_SMI_OVT) & 0x7f)
		    | ((data->fan_div[3] & 0x04) << 5);
		w83627ehf_write_value(data, W83627EHF_REG_SMI_OVT, reg);
		break;
	case 4:
		reg = (w83627ehf_read_value(data, W83627EHF_REG_DIODE) & 0x73)
		    | ((data->fan_div[4] & 0x03) << 2)
		    | ((data->fan_div[4] & 0x04) << 5);
		w83627ehf_write_value(data, W83627EHF_REG_DIODE, reg);
		break;
	}
}

static void w83627ehf_write_fan_div_common(struct device *dev,
					   struct w83627ehf_data *data, int nr)
{
	struct w83627ehf_sio_data *sio_data = dev->platform_data;

	if (sio_data->kind == nct6776)
		; /* no dividers, do nothing */
	else if (sio_data->kind == nct6775)
		nct6775_write_fan_div(data, nr);
	else
		w83627ehf_write_fan_div(data, nr);
}

static void nct6775_update_fan_div(struct w83627ehf_data *data)
{
	u8 i;

	i = w83627ehf_read_value(data, NCT6775_REG_FANDIV1);
	data->fan_div[0] = i & 0x7;
	data->fan_div[1] = (i & 0x70) >> 4;
	i = w83627ehf_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 w83627ehf_update_fan_div(struct w83627ehf_data *data)
{
	int i;

	i = w83627ehf_read_value(data, W83627EHF_REG_FANDIV1);
	data->fan_div[0] = (i >> 4) & 0x03;
	data->fan_div[1] = (i >> 6) & 0x03;
	i = w83627ehf_read_value(data, W83627EHF_REG_FANDIV2);
	data->fan_div[2] = (i >> 6) & 0x03;
	i = w83627ehf_read_value(data, W83627EHF_REG_VBAT);
	data->fan_div[0] |= (i >> 3) & 0x04;
	data->fan_div[1] |= (i >> 4) & 0x04;
	data->fan_div[2] |= (i >> 5) & 0x04;
	if (data->has_fan & ((1 << 3) | (1 << 4))) {
		i = w83627ehf_read_value(data, W83627EHF_REG_DIODE);
		data->fan_div[3] = i & 0x03;
		data->fan_div[4] = ((i >> 2) & 0x03)
				 | ((i >> 5) & 0x04);
	}
	if (data->has_fan & (1 << 3)) {
		i = w83627ehf_read_value(data, W83627EHF_REG_SMI_OVT);
		data->fan_div[3] |= (i >> 5) & 0x04;
	}
}

static void w83627ehf_update_fan_div_common(struct device *dev,
					    struct w83627ehf_data *data)
{
	struct w83627ehf_sio_data *sio_data = dev->platform_data;

	if (sio_data->kind == nct6776)
		; /* no dividers, do nothing */
	else if (sio_data->kind == nct6775)
		nct6775_update_fan_div(data);
	else
		w83627ehf_update_fan_div(data);
}

static void nct6775_update_pwm(struct w83627ehf_data *data)
{
	int i;
	int pwmcfg, fanmodecfg;

	for (i = 0; i < data->pwm_num; i++) {
		pwmcfg = w83627ehf_read_value(data,
					      W83627EHF_REG_PWM_ENABLE[i]);
		fanmodecfg = w83627ehf_read_value(data,
						  NCT6775_REG_FAN_MODE[i]);
		data->pwm_mode[i] =
		  ((pwmcfg >> W83627EHF_PWM_MODE_SHIFT[i]) & 1) ? 0 : 1;
		data->pwm_enable[i] = ((fanmodecfg >> 4) & 7) + 1;
		data->tolerance[i] = fanmodecfg & 0x0f;
		data->pwm[i] = w83627ehf_read_value(data, data->REG_PWM[i]);
	}
}

static void w83627ehf_update_pwm(struct w83627ehf_data *data)
{
	int i;
	int pwmcfg = 0, tolerance = 0; /* shut up the compiler */

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

		/* pwmcfg, tolerance mapped for i=0, i=1 to same reg */
		if (i != 1) {
			pwmcfg = w83627ehf_read_value(data,
					W83627EHF_REG_PWM_ENABLE[i]);
			tolerance = w83627ehf_read_value(data,
					W83627EHF_REG_TOLERANCE[i]);
		}
		data->pwm_mode[i] =
			((pwmcfg >> W83627EHF_PWM_MODE_SHIFT[i]) & 1) ? 0 : 1;
		data->pwm_enable[i] = ((pwmcfg >> W83627EHF_PWM_ENABLE_SHIFT[i])
				       & 3) + 1;
		data->pwm[i] = w83627ehf_read_value(data, data->REG_PWM[i]);

		data->tolerance[i] = (tolerance >> (i == 1 ? 4 : 0)) & 0x0f;
	}
}

static void w83627ehf_update_pwm_common(struct device *dev,
					struct w83627ehf_data *data)
{
	struct w83627ehf_sio_data *sio_data = dev->platform_data;

	if (sio_data->kind == nct6775 || sio_data->kind == nct6776)
		nct6775_update_pwm(data);
	else
		w83627ehf_update_pwm(data);
}

static struct w83627ehf_data *w83627ehf_update_device(struct device *dev)
{
	struct w83627ehf_data *data = dev_get_drvdata(dev);
	struct w83627ehf_sio_data *sio_data = dev->platform_data;

	int i;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ/2)
	 || !data->valid) {
		/* Fan clock dividers */
		w83627ehf_update_fan_div_common(dev, data);

		/* Measured voltages and limits */
		for (i = 0; i < data->in_num; i++) {
			data->in[i] = w83627ehf_read_value(data,
				      W83627EHF_REG_IN(i));
			data->in_min[i] = w83627ehf_read_value(data,
					  W83627EHF_REG_IN_MIN(i));
			data->in_max[i] = w83627ehf_read_value(data,
					  W83627EHF_REG_IN_MAX(i));
		}

		/* Measured fan speeds and limits */
		for (i = 0; i < 5; i++) {
			u16 reg;

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

			reg = w83627ehf_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] = w83627ehf_read_value(data,
					   data->REG_FAN_MIN[i]);

			/* If we failed to measure the fan speed and clock
			   divider can be increased, let's try that for next
			   time */
			if (data->has_fan_div
			    && (reg >= 0xff || (sio_data->kind == nct6775
						&& reg == 0x00))
			    && data->fan_div[i] < 0x07) {
				dev_dbg(dev, "Increasing fan%d "
					"clock divider from %u to %u\n",
					i + 1, div_from_reg(data->fan_div[i]),
					div_from_reg(data->fan_div[i] + 1));
				data->fan_div[i]++;
				w83627ehf_write_fan_div_common(dev, data, i);
				/* Preserve min limit if possible */
				if ((data->has_fan_min & (1 << i))
				 && data->fan_min[i] >= 2
				 && data->fan_min[i] != 255)
					w83627ehf_write_value(data,
						data->REG_FAN_MIN[i],
						(data->fan_min[i] /= 2));
			}
		}

		w83627ehf_update_pwm_common(dev, data);

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

			data->fan_start_output[i] =
			  w83627ehf_read_value(data,
					       data->REG_FAN_START_OUTPUT[i]);
			data->fan_stop_output[i] =
			  w83627ehf_read_value(data,
					       data->REG_FAN_STOP_OUTPUT[i]);
			data->fan_stop_time[i] =
			  w83627ehf_read_value(data,
					       data->REG_FAN_STOP_TIME[i]);

			if (data->REG_FAN_MAX_OUTPUT &&
			    data->REG_FAN_MAX_OUTPUT[i] != 0xff)
				data->fan_max_output[i] =
				  w83627ehf_read_value(data,
						data->REG_FAN_MAX_OUTPUT[i]);

			if (data->REG_FAN_STEP_OUTPUT &&
			    data->REG_FAN_STEP_OUTPUT[i] != 0xff)
				data->fan_step_output[i] =
				  w83627ehf_read_value(data,
						data->REG_FAN_STEP_OUTPUT[i]);

			data->target_temp[i] =
				w83627ehf_read_value(data,
					data->REG_TARGET[i]) &
					(data->pwm_mode[i] == 1 ? 0x7f : 0xff);
		}

		/* Measured temperatures and limits */
		for (i = 0; i < NUM_REG_TEMP; i++) {
			if (!(data->have_temp & (1 << i)))
				continue;
			data->temp[i] = w83627ehf_read_value(data,
						data->reg_temp[i]);
			if (data->reg_temp_over[i])
				data->temp_max[i]
				  = w83627ehf_read_value(data,
						data->reg_temp_over[i]);
			if (data->reg_temp_hyst[i])
				data->temp_max_hyst[i]
				  = w83627ehf_read_value(data,
						data->reg_temp_hyst[i]);
		}

		data->alarms = w83627ehf_read_value(data,
					W83627EHF_REG_ALARM1) |
			       (w83627ehf_read_value(data,
					W83627EHF_REG_ALARM2) << 8) |
			       (w83627ehf_read_value(data,
					W83627EHF_REG_ALARM3) << 16);

		data->caseopen = w83627ehf_read_value(data,
						W83627EHF_REG_CASEOPEN_DET);

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

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

/*
 * Sysfs callback functions
 */
#define show_in_reg(reg) \
static ssize_t \
show_##reg(struct device *dev, struct device_attribute *attr, \
	   char *buf) \
{ \
	struct w83627ehf_data *data = w83627ehf_update_device(dev); \
	struct sensor_device_attribute *sensor_attr = \
		to_sensor_dev_attr(attr); \
	int nr = sensor_attr->index; \
	return sprintf(buf, "%ld\n", in_from_reg(data->reg[nr], nr)); \
}
show_in_reg(in)
show_in_reg(in_min)
show_in_reg(in_max)

#define store_in_reg(REG, reg) \
static ssize_t \
store_in_##reg(struct device *dev, struct device_attribute *attr, \
	       const char *buf, size_t count) \
{ \
	struct w83627ehf_data *data = dev_get_drvdata(dev); \
	struct sensor_device_attribute *sensor_attr = \
		to_sensor_dev_attr(attr); \
	int nr = sensor_attr->index; \
	unsigned long val; \
	int err; \
	err = strict_strtoul(buf, 10, &val); \
	if (err < 0) \
		return err; \
	mutex_lock(&data->update_lock); \
	data->in_##reg[nr] = in_to_reg(val, nr); \
	w83627ehf_write_value(data, W83627EHF_REG_IN_##REG(nr), \
			      data->in_##reg[nr]); \
	mutex_unlock(&data->update_lock); \
	return count; \
}

store_in_reg(MIN, min)
store_in_reg(MAX, max)

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	struct w83627ehf_data *data = w83627ehf_update_device(dev);
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	return sprintf(buf, "%u\n", (data->alarms >> nr) & 0x01);
}

static struct sensor_device_attribute sda_in_input[] = {
	SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),
	SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),
	SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),
	SENSOR_ATTR(in3_input, S_IRUGO, show_in, NULL, 3),
	SENSOR_ATTR(in4_input, S_IRUGO, show_in, NULL, 4),
	SENSOR_ATTR(in5_input, S_IRUGO, show_in, NULL, 5),
	SENSOR_ATTR(in6_input, S_IRUGO, show_in, NULL, 6),
	SENSOR_ATTR(in7_input, S_IRUGO, show_in, NULL, 7),
	SENSOR_ATTR(in8_input, S_IRUGO, show_in, NULL, 8),
	SENSOR_ATTR(in9_input, S_IRUGO, show_in, NULL, 9),
};

static struct sensor_device_attribute sda_in_alarm[] = {
	SENSOR_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0),
	SENSOR_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1),
	SENSOR_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2),
	SENSOR_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3),
	SENSOR_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8),
	SENSOR_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 21),
	SENSOR_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 20),
	SENSOR_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 16),
	SENSOR_ATTR(in8_alarm, S_IRUGO, show_alarm, NULL, 17),
	SENSOR_ATTR(in9_alarm, S_IRUGO, show_alarm, NULL, 19),
};

static struct sensor_device_attribute sda_in_min[] = {
	SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),
	SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),
	SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),
	SENSOR_ATTR(in3_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 3),
	SENSOR_ATTR(in4_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 4),
	SENSOR_ATTR(in5_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 5),
	SENSOR_ATTR(in6_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 6),
	SENSOR_ATTR(in7_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 7),
	SENSOR_ATTR(in8_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 8),
	SENSOR_ATTR(in9_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 9),
};

static struct sensor_device_attribute sda_in_max[] = {
	SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),
	SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),
	SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),
	SENSOR_ATTR(in3_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 3),
	SENSOR_ATTR(in4_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 4),
	SENSOR_ATTR(in5_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 5),
	SENSOR_ATTR(in6_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 6),
	SENSOR_ATTR(in7_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 7),
	SENSOR_ATTR(in8_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 8),
	SENSOR_ATTR(in9_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 9),
};

static ssize_t
show_fan(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83627ehf_data *data = w83627ehf_update_device(dev);
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);