path: root/drivers/hwmon/w83792d.c

/*
    w83792d.c - Part of lm_sensors, Linux kernel modules for hardware
                monitoring
    Copyright (C) 2004, 2005 Winbond Electronics Corp.
                        Chunhao Huang <DZShen@Winbond.com.tw>,
                        Rudolf Marek <r.marek@sh.cvut.cz>

    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.

    Note:
    1. This driver is only for 2.6 kernel, 2.4 kernel need a different driver.
    2. This driver is only for Winbond W83792D C version device, there
       are also some motherboards with B version W83792D device. The
       calculation method to in6-in7(measured value, limits) is a little
       different between C and B version. C or B version can be identified
       by CR[0x49h].
*/

/*
    Supports following chips:

    Chip	#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
    w83792d	9	7	7	3	0x7a	0x5ca3	yes	no
*/

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

/* Addresses to scan */
static unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f, I2C_CLIENT_END };

/* Insmod parameters */
I2C_CLIENT_INSMOD_1(w83792d);
I2C_CLIENT_MODULE_PARM(force_subclients, "List of subclient addresses: "
			"{bus, clientaddr, subclientaddr1, subclientaddr2}");

static int init;
module_param(init, bool, 0);
MODULE_PARM_DESC(init, "Set to one to force chip initialization");

/* The W83792D registers */
static const u8 W83792D_REG_IN[9] = {
	0x20,	/* Vcore A in DataSheet */
	0x21,	/* Vcore B in DataSheet */
	0x22,	/* VIN0 in DataSheet */
	0x23,	/* VIN1 in DataSheet */
	0x24,	/* VIN2 in DataSheet */
	0x25,	/* VIN3 in DataSheet */
	0x26,	/* 5VCC in DataSheet */
	0xB0,	/* 5VSB in DataSheet */
	0xB1	/* VBAT in DataSheet */
};
#define W83792D_REG_LOW_BITS1 0x3E  /* Low Bits I in DataSheet */
#define W83792D_REG_LOW_BITS2 0x3F  /* Low Bits II in DataSheet */
static const u8 W83792D_REG_IN_MAX[9] = {
	0x2B,	/* Vcore A High Limit in DataSheet */
	0x2D,	/* Vcore B High Limit in DataSheet */
	0x2F,	/* VIN0 High Limit in DataSheet */
	0x31,	/* VIN1 High Limit in DataSheet */
	0x33,	/* VIN2 High Limit in DataSheet */
	0x35,	/* VIN3 High Limit in DataSheet */
	0x37,	/* 5VCC High Limit in DataSheet */
	0xB4,	/* 5VSB High Limit in DataSheet */
	0xB6	/* VBAT High Limit in DataSheet */
};
static const u8 W83792D_REG_IN_MIN[9] = {
	0x2C,	/* Vcore A Low Limit in DataSheet */
	0x2E,	/* Vcore B Low Limit in DataSheet */
	0x30,	/* VIN0 Low Limit in DataSheet */
	0x32,	/* VIN1 Low Limit in DataSheet */
	0x34,	/* VIN2 Low Limit in DataSheet */
	0x36,	/* VIN3 Low Limit in DataSheet */
	0x38,	/* 5VCC Low Limit in DataSheet */
	0xB5,	/* 5VSB Low Limit in DataSheet */
	0xB7	/* VBAT Low Limit in DataSheet */
};
static const u8 W83792D_REG_FAN[7] = {
	0x28,	/* FAN 1 Count in DataSheet */
	0x29,	/* FAN 2 Count in DataSheet */
	0x2A,	/* FAN 3 Count in DataSheet */
	0xB8,	/* FAN 4 Count in DataSheet */
	0xB9,	/* FAN 5 Count in DataSheet */
	0xBA,	/* FAN 6 Count in DataSheet */
	0xBE	/* FAN 7 Count in DataSheet */
};
static const u8 W83792D_REG_FAN_MIN[7] = {
	0x3B,	/* FAN 1 Count Low Limit in DataSheet */
	0x3C,	/* FAN 2 Count Low Limit in DataSheet */
	0x3D,	/* FAN 3 Count Low Limit in DataSheet */
	0xBB,	/* FAN 4 Count Low Limit in DataSheet */
	0xBC,	/* FAN 5 Count Low Limit in DataSheet */
	0xBD,	/* FAN 6 Count Low Limit in DataSheet */
	0xBF	/* FAN 7 Count Low Limit in DataSheet */
};
#define W83792D_REG_FAN_CFG 0x84	/* FAN Configuration in DataSheet */
static const u8 W83792D_REG_FAN_DIV[4] = {
	0x47,	/* contains FAN2 and FAN1 Divisor */
	0x5B,	/* contains FAN4 and FAN3 Divisor */
	0x5C,	/* contains FAN6 and FAN5 Divisor */
	0x9E	/* contains FAN7 Divisor. */
};
static const u8 W83792D_REG_PWM[7] = {
	0x81,	/* FAN 1 Duty Cycle, be used to control */
	0x83,	/* FAN 2 Duty Cycle, be used to control */
	0x94,	/* FAN 3 Duty Cycle, be used to control */
	0xA3,	/* FAN 4 Duty Cycle, be used to control */
	0xA4,	/* FAN 5 Duty Cycle, be used to control */
	0xA5,	/* FAN 6 Duty Cycle, be used to control */
	0xA6	/* FAN 7 Duty Cycle, be used to control */
};
#define W83792D_REG_BANK		0x4E
#define W83792D_REG_TEMP2_CONFIG	0xC2
#define W83792D_REG_TEMP3_CONFIG	0xCA

static const u8 W83792D_REG_TEMP1[3] = {
	0x27,	/* TEMP 1 in DataSheet */
	0x39,	/* TEMP 1 Over in DataSheet */
	0x3A,	/* TEMP 1 Hyst in DataSheet */
};

static const u8 W83792D_REG_TEMP_ADD[2][6] = {
	{ 0xC0,		/* TEMP 2 in DataSheet */
	  0xC1,		/* TEMP 2(0.5 deg) in DataSheet */
	  0xC5,		/* TEMP 2 Over High part in DataSheet */
	  0xC6,		/* TEMP 2 Over Low part in DataSheet */
	  0xC3,		/* TEMP 2 Thyst High part in DataSheet */
	  0xC4 },	/* TEMP 2 Thyst Low part in DataSheet */
	{ 0xC8,		/* TEMP 3 in DataSheet */
	  0xC9,		/* TEMP 3(0.5 deg) in DataSheet */
	  0xCD,		/* TEMP 3 Over High part in DataSheet */
	  0xCE,		/* TEMP 3 Over Low part in DataSheet */
	  0xCB,		/* TEMP 3 Thyst High part in DataSheet */
	  0xCC }	/* TEMP 3 Thyst Low part in DataSheet */
};

static const u8 W83792D_REG_THERMAL[3] = {
	0x85,	/* SmartFanI: Fan1 target value */
	0x86,	/* SmartFanI: Fan2 target value */
	0x96	/* SmartFanI: Fan3 target value */
};

static const u8 W83792D_REG_TOLERANCE[3] = {
	0x87,	/* (bit3-0)SmartFan Fan1 tolerance */
	0x87,	/* (bit7-4)SmartFan Fan2 tolerance */
	0x97	/* (bit3-0)SmartFan Fan3 tolerance */
};

static const u8 W83792D_REG_POINTS[3][4] = {
	{ 0x85,		/* SmartFanII: Fan1 temp point 1 */
	  0xE3,		/* SmartFanII: Fan1 temp point 2 */
	  0xE4,		/* SmartFanII: Fan1 temp point 3 */
	  0xE5 },	/* SmartFanII: Fan1 temp point 4 */
	{ 0x86,		/* SmartFanII: Fan2 temp point 1 */
	  0xE6,		/* SmartFanII: Fan2 temp point 2 */
	  0xE7,		/* SmartFanII: Fan2 temp point 3 */
	  0xE8 },	/* SmartFanII: Fan2 temp point 4 */
	{ 0x96,		/* SmartFanII: Fan3 temp point 1 */
	  0xE9,		/* SmartFanII: Fan3 temp point 2 */
	  0xEA,		/* SmartFanII: Fan3 temp point 3 */
	  0xEB }	/* SmartFanII: Fan3 temp point 4 */
};

static const u8 W83792D_REG_LEVELS[3][4] = {
	{ 0x88,		/* (bit3-0) SmartFanII: Fan1 Non-Stop */
	  0x88,		/* (bit7-4) SmartFanII: Fan1 Level 1 */
	  0xE0,		/* (bit7-4) SmartFanII: Fan1 Level 2 */
	  0xE0 },	/* (bit3-0) SmartFanII: Fan1 Level 3 */
	{ 0x89,		/* (bit3-0) SmartFanII: Fan2 Non-Stop */
	  0x89,		/* (bit7-4) SmartFanII: Fan2 Level 1 */
	  0xE1,		/* (bit7-4) SmartFanII: Fan2 Level 2 */
	  0xE1 },	/* (bit3-0) SmartFanII: Fan2 Level 3 */
	{ 0x98,		/* (bit3-0) SmartFanII: Fan3 Non-Stop */
	  0x98,		/* (bit7-4) SmartFanII: Fan3 Level 1 */
	  0xE2,		/* (bit7-4) SmartFanII: Fan3 Level 2 */
	  0xE2 }	/* (bit3-0) SmartFanII: Fan3 Level 3 */
};

#define W83792D_REG_CONFIG		0x40
#define W83792D_REG_VID_FANDIV		0x47
#define W83792D_REG_CHIPID		0x49
#define W83792D_REG_WCHIPID		0x58
#define W83792D_REG_CHIPMAN		0x4F
#define W83792D_REG_PIN			0x4B
#define W83792D_REG_I2C_SUBADDR		0x4A

#define W83792D_REG_ALARM1 0xA9		/* realtime status register1 */
#define W83792D_REG_ALARM2 0xAA		/* realtime status register2 */
#define W83792D_REG_ALARM3 0xAB		/* realtime status register3 */
#define W83792D_REG_CHASSIS 0x42	/* Bit 5: Case Open status bit */
#define W83792D_REG_CHASSIS_CLR 0x44	/* Bit 7: Case Open CLR_CHS/Reset bit */

/* control in0/in1 's limit modifiability */
#define W83792D_REG_VID_IN_B		0x17

#define W83792D_REG_VBAT		0x5D
#define W83792D_REG_I2C_ADDR		0x48

/* Conversions. Rounding and limit checking is only done on the TO_REG
   variants. Note that you should be a bit careful with which arguments
   these macros are called: arguments may be evaluated more than once.
   Fixing this is just not worth it. */
#define IN_FROM_REG(nr,val) (((nr)<=1)?(val*2): \
				((((nr)==6)||((nr)==7))?(val*6):(val*4)))
#define IN_TO_REG(nr,val) (((nr)<=1)?(val/2): \
				((((nr)==6)||((nr)==7))?(val/6):(val/4)))

static inline u8
FAN_TO_REG(long rpm, int div)
{
	if (rpm == 0)
		return 255;
	rpm = SENSORS_LIMIT(rpm, 1, 1000000);
	return SENSORS_LIMIT((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
}

#define FAN_FROM_REG(val,div)	((val) == 0   ? -1 : \
				((val) == 255 ? 0 : \
						1350000 / ((val) * (div))))

/* for temp1 */
#define TEMP1_TO_REG(val)	(SENSORS_LIMIT(((val) < 0 ? (val)+0x100*1000 \
					: (val)) / 1000, 0, 0xff))
#define TEMP1_FROM_REG(val)	(((val) & 0x80 ? (val)-0x100 : (val)) * 1000)
/* for temp2 and temp3, because they need addtional resolution */
#define TEMP_ADD_FROM_REG(val1, val2) \
	((((val1) & 0x80 ? (val1)-0x100 \
		: (val1)) * 1000) + ((val2 & 0x80) ? 500 : 0))
#define TEMP_ADD_TO_REG_HIGH(val) \
	(SENSORS_LIMIT(((val) < 0 ? (val)+0x100*1000 \
			: (val)) / 1000, 0, 0xff))
#define TEMP_ADD_TO_REG_LOW(val)	((val%1000) ? 0x80 : 0x00)

#define PWM_FROM_REG(val)		(val)
#define PWM_TO_REG(val)			(SENSORS_LIMIT((val),0,255))
#define DIV_FROM_REG(val)		(1 << (val))

static inline u8
DIV_TO_REG(long val)
{
	int i;
	val = SENSORS_LIMIT(val, 1, 128) >> 1;
	for (i = 0; i < 6; i++) {
		if (val == 0)
			break;
		val >>= 1;
	}
	return ((u8) i);
}

struct w83792d_data {
	struct i2c_client client;
	struct class_device *class_dev;
	struct semaphore lock;
	enum chips type;

	struct semaphore update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	/* array of 2 pointers to subclients */
	struct i2c_client *lm75[2];

	u8 in[9];		/* Register value */
	u8 in_max[9];		/* Register value */
	u8 in_min[9];		/* Register value */
	u8 low_bits[2];		/* Additional resolution to voltage in0-6 */
	u8 fan[7];		/* Register value */
	u8 fan_min[7];		/* Register value */
	u8 temp1[3];		/* current, over, thyst */
	u8 temp_add[2][6];	/* Register value */
	u8 fan_div[7];		/* Register encoding, shifted right */
	u8 pwm[7];		/* We only consider the first 3 set of pwm,
				   although 792 chip has 7 set of pwm. */
	u8 pwmenable[3];
	u8 pwm_mode[7];		/* indicates PWM or DC mode: 1->PWM; 0->DC */
	u32 alarms;		/* realtime status register encoding,combined */
	u8 chassis;		/* Chassis status */
	u8 chassis_clear;	/* CLR_CHS, clear chassis intrusion detection */
	u8 thermal_cruise[3];	/* Smart FanI: Fan1,2,3 target value */
	u8 tolerance[3];	/* Fan1,2,3 tolerance(Smart Fan I/II) */
	u8 sf2_points[3][4];	/* Smart FanII: Fan1,2,3 temperature points */
	u8 sf2_levels[3][4];	/* Smart FanII: Fan1,2,3 duty cycle levels */
};

static int w83792d_attach_adapter(struct i2c_adapter *adapter);
static int w83792d_detect(struct i2c_adapter *adapter, int address, int kind);
static int w83792d_detach_client(struct i2c_client *client);

static int w83792d_read_value(struct i2c_client *client, u8 register);
static int w83792d_write_value(struct i2c_client *client, u8 register,
				u8 value);
static struct w83792d_data *w83792d_update_device(struct device *dev);

#ifdef DEBUG
static void w83792d_print_debug(struct w83792d_data *data, struct device *dev);
#endif

static void w83792d_init_client(struct i2c_client *client);

static struct i2c_driver w83792d_driver = {
	.owner = THIS_MODULE,
	.name = "w83792d",
	.flags = I2C_DF_NOTIFY,
	.attach_adapter = w83792d_attach_adapter,
	.detach_client = w83792d_detach_client,
};

static long in_count_from_reg(int nr, struct w83792d_data *data)
{
	u16 vol_count = data->in[nr];
	u16 low_bits = 0;
	vol_count = (vol_count << 2);
	switch (nr)
	{
	case 0:  /* vin0 */
		low_bits = (data->low_bits[0]) & 0x03;
		break;
	case 1:  /* vin1 */
		low_bits = ((data->low_bits[0]) & 0x0c) >> 2;
		break;
	case 2:  /* vin2 */
		low_bits = ((data->low_bits[0]) & 0x30) >> 4;
		break;
	case 3:  /* vin3 */
		low_bits = ((data->low_bits[0]) & 0xc0) >> 6;
		break;
	case 4:  /* vin4 */
		low_bits = (data->low_bits[1]) & 0x03;
		break;
	case 5:  /* vin5 */
		low_bits = ((data->low_bits[1]) & 0x0c) >> 2;
		break;
	case 6:  /* vin6 */
		low_bits = ((data->low_bits[1]) & 0x30) >> 4;
	default:
		break;
	}
	vol_count = vol_count | low_bits;
	return vol_count;
}

/* following are the sysfs callback functions */
static ssize_t show_in(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf,"%ld\n", IN_FROM_REG(nr,(in_count_from_reg(nr, data))));
}

#define show_in_reg(reg) \
static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
			char *buf) \
{ \
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); \
	int nr = sensor_attr->index; \
	struct w83792d_data *data = w83792d_update_device(dev); \
	return sprintf(buf,"%ld\n", (long)(IN_FROM_REG(nr, (data->reg[nr])*4))); \
}

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 sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); \
	int nr = sensor_attr->index; \
	struct i2c_client *client = to_i2c_client(dev); \
	struct w83792d_data *data = i2c_get_clientdata(client); \
	u32 val; \
	 \
	val = simple_strtoul(buf, NULL, 10); \
	data->in_##reg[nr] = SENSORS_LIMIT(IN_TO_REG(nr, val)/4, 0, 255); \
	w83792d_write_value(client, W83792D_REG_IN_##REG[nr], data->in_##reg[nr]); \
	 \
	return count; \
}
store_in_reg(MIN, min);
store_in_reg(MAX, max);

#define sysfs_in_reg(offset) \
static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, show_in, \
				NULL, offset); \
static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
				show_in_min, store_in_min, offset); \
static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
				show_in_max, store_in_max, offset);

sysfs_in_reg(0);
sysfs_in_reg(1);
sysfs_in_reg(2);
sysfs_in_reg(3);
sysfs_in_reg(4);
sysfs_in_reg(5);
sysfs_in_reg(6);
sysfs_in_reg(7);
sysfs_in_reg(8);

#define device_create_file_in(client, offset) \
do { \
device_create_file(&client->dev, &sensor_dev_attr_in##offset##_input.dev_attr); \
device_create_file(&client->dev, &sensor_dev_attr_in##offset##_max.dev_attr); \
device_create_file(&client->dev, &sensor_dev_attr_in##offset##_min.dev_attr); \
} while (0)

#define show_fan_reg(reg) \
static ssize_t show_##reg (struct device *dev, struct device_attribute *attr, \
			char *buf) \
{ \
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); \
	int nr = sensor_attr->index - 1; \
	struct w83792d_data *data = w83792d_update_device(dev); \
	return sprintf(buf,"%d\n", \
		FAN_FROM_REG(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \
}

show_fan_reg(fan);
show_fan_reg(fan_min);

static ssize_t
store_fan_min(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index - 1;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	u32 val;

	val = simple_strtoul(buf, NULL, 10);
	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
	w83792d_write_value(client, W83792D_REG_FAN_MIN[nr],
				data->fan_min[nr]);

	return count;
}

static ssize_t
show_fan_div(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr - 1]));
}

/* Note: we save and restore the fan minimum here, because its value is
   determined in part by the fan divisor.  This follows the principle of
   least suprise; the user doesn't expect the fan minimum to change just
   because the divisor changed. */
static ssize_t
store_fan_div(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index - 1;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	unsigned long min;
	/*u8 reg;*/
	u8 fan_div_reg = 0;
	u8 tmp_fan_div;

	/* Save fan_min */
	min = FAN_FROM_REG(data->fan_min[nr],
			   DIV_FROM_REG(data->fan_div[nr]));

	data->fan_div[nr] = DIV_TO_REG(simple_strtoul(buf, NULL, 10));

	fan_div_reg = w83792d_read_value(client, W83792D_REG_FAN_DIV[nr >> 1]);
	fan_div_reg &= (nr & 0x01) ? 0x8f : 0xf8;
	tmp_fan_div = (nr & 0x01) ? (((data->fan_div[nr]) << 4) & 0x70)
					: ((data->fan_div[nr]) & 0x07);
	w83792d_write_value(client, W83792D_REG_FAN_DIV[nr >> 1],
					fan_div_reg | tmp_fan_div);

	/* Restore fan_min */
	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
	w83792d_write_value(client, W83792D_REG_FAN_MIN[nr], data->fan_min[nr]);

	return count;
}

#define sysfs_fan(offset) \
static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, show_fan, NULL, \
				offset); \
static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
				show_fan_div, store_fan_div, offset); \
static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
				show_fan_min, store_fan_min, offset);

sysfs_fan(1);
sysfs_fan(2);
sysfs_fan(3);
sysfs_fan(4);
sysfs_fan(5);
sysfs_fan(6);
sysfs_fan(7);

#define device_create_file_fan(client, offset) \
do { \
device_create_file(&client->dev, &sensor_dev_attr_fan##offset##_input.dev_attr); \
device_create_file(&client->dev, &sensor_dev_attr_fan##offset##_div.dev_attr); \
device_create_file(&client->dev, &sensor_dev_attr_fan##offset##_min.dev_attr); \
} while (0)


/* read/write the temperature1, includes measured value and limits */

static ssize_t show_temp1(struct device *dev, struct device_attribute *attr,
				char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%d\n", TEMP1_FROM_REG(data->temp1[nr]));
}

static ssize_t store_temp1(struct device *dev, struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	s32 val;

	val = simple_strtol(buf, NULL, 10);

	data->temp1[nr] = TEMP1_TO_REG(val);
	w83792d_write_value(client, W83792D_REG_TEMP1[nr],
		data->temp1[nr]);

	return count;
}


static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp1, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp1,
				store_temp1, 1);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp1,
				store_temp1, 2);

#define device_create_file_temp1(client) \
do { \
device_create_file(&client->dev, &sensor_dev_attr_temp1_input.dev_attr); \
device_create_file(&client->dev, &sensor_dev_attr_temp1_max.dev_attr); \
device_create_file(&client->dev, &sensor_dev_attr_temp1_max_hyst.dev_attr); \
} while (0)


/* read/write the temperature2-3, includes measured value and limits */

static ssize_t show_temp23(struct device *dev, struct device_attribute *attr,
				char *buf)
{
	struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int index = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf,"%ld\n",
		(long)TEMP_ADD_FROM_REG(data->temp_add[nr][index],
			data->temp_add[nr][index+1]));
}

static ssize_t store_temp23(struct device *dev, struct device_attribute *attr,
				const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int index = sensor_attr->index;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	s32 val;

	val = simple_strtol(buf, NULL, 10);

	data->temp_add[nr][index] = TEMP_ADD_TO_REG_HIGH(val);
	data->temp_add[nr][index+1] = TEMP_ADD_TO_REG_LOW(val);
	w83792d_write_value(client, W83792D_REG_TEMP_ADD[nr][index],
		data->temp_add[nr][index]);
	w83792d_write_value(client, W83792D_REG_TEMP_ADD[nr][index+1],
		data->temp_add[nr][index+1]);

	return count;
}

#define sysfs_temp23(name,idx) \
static SENSOR_DEVICE_ATTR_2(name##_input, S_IRUGO, show_temp23, NULL, \
				idx, 0); \
static SENSOR_DEVICE_ATTR_2(name##_max, S_IRUGO | S_IWUSR, \
				show_temp23, store_temp23, idx, 2); \
static SENSOR_DEVICE_ATTR_2(name##_max_hyst, S_IRUGO | S_IWUSR, \
				show_temp23, store_temp23, idx, 4);

sysfs_temp23(temp2,0)
sysfs_temp23(temp3,1)

#define device_create_file_temp_add(client, offset) \
do { \
device_create_file(&client->dev, &sensor_dev_attr_temp##offset##_input.dev_attr); \
device_create_file(&client->dev, &sensor_dev_attr_temp##offset##_max.dev_attr); \
device_create_file(&client->dev, \
&sensor_dev_attr_temp##offset##_max_hyst.dev_attr); \
} while (0)


/* get reatime status of all sensors items: voltage, temp, fan */
static ssize_t
show_alarms_reg(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%d\n", data->alarms);
}

static
DEVICE_ATTR(alarms, S_IRUGO, show_alarms_reg, NULL);
#define device_create_file_alarms(client) \
device_create_file(&client->dev, &dev_attr_alarms);



static ssize_t
show_pwm(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%ld\n", (long) PWM_FROM_REG(data->pwm[nr-1]));
}

static ssize_t
show_pwmenable(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index - 1;
	struct w83792d_data *data = w83792d_update_device(dev);
	long pwm_enable_tmp = 1;

	switch (data->pwmenable[nr]) {
	case 0:
		pwm_enable_tmp = 1; /* manual mode */
		break;
	case 1:
		pwm_enable_tmp = 3; /*thermal cruise/Smart Fan I */
		break;
	case 2:
		pwm_enable_tmp = 2; /* Smart Fan II */
		break;
	}

	return sprintf(buf, "%ld\n", pwm_enable_tmp);
}

static ssize_t
store_pwm(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index - 1;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	u32 val;

	val = simple_strtoul(buf, NULL, 10);
	data->pwm[nr] = PWM_TO_REG(val);
	w83792d_write_value(client, W83792D_REG_PWM[nr], data->pwm[nr]);

	return count;
}

static ssize_t
store_pwmenable(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index - 1;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	u32 val;
	u8 fan_cfg_tmp, cfg1_tmp, cfg2_tmp, cfg3_tmp, cfg4_tmp;

	val = simple_strtoul(buf, NULL, 10);
	switch (val) {
	case 1:
		data->pwmenable[nr] = 0; /* manual mode */
		break;
	case 2:
		data->pwmenable[nr] = 2; /* Smart Fan II */
		break;
	case 3:
		data->pwmenable[nr] = 1; /* thermal cruise/Smart Fan I */
		break;
	default:
		return -EINVAL;
	}
	cfg1_tmp = data->pwmenable[0];
	cfg2_tmp = (data->pwmenable[1]) << 2;
	cfg3_tmp = (data->pwmenable[2]) << 4;
	cfg4_tmp = w83792d_read_value(client,W83792D_REG_FAN_CFG) & 0xc0;
	fan_cfg_tmp = ((cfg4_tmp | cfg3_tmp) | cfg2_tmp) | cfg1_tmp;
	w83792d_write_value(client, W83792D_REG_FAN_CFG, fan_cfg_tmp);

	return count;
}

#define sysfs_pwm(offset) \
static SENSOR_DEVICE_ATTR(pwm##offset, S_IRUGO | S_IWUSR, \
				show_pwm, store_pwm, offset); \
static SENSOR_DEVICE_ATTR(pwm##offset##_enable, S_IRUGO | S_IWUSR, \
				show_pwmenable, store_pwmenable, offset); \

sysfs_pwm(1);
sysfs_pwm(2);
sysfs_pwm(3);


#define device_create_file_pwm(client, offset) \
do { \
device_create_file(&client->dev, &sensor_dev_attr_pwm##offset.dev_attr); \
} while (0)

#define device_create_file_pwmenable(client, offset) \
do { \
device_create_file(&client->dev, &sensor_dev_attr_pwm##offset##_enable.dev_attr); \
} while (0)


static ssize_t
show_pwm_mode(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%d\n", data->pwm_mode[nr-1]);
}

static ssize_t
store_pwm_mode(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index - 1;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	u32 val;
	u8 pwm_mode_mask = 0;

	val = simple_strtoul(buf, NULL, 10);
	data->pwm_mode[nr] = SENSORS_LIMIT(val, 0, 1);
	pwm_mode_mask = w83792d_read_value(client,
		W83792D_REG_PWM[nr]) & 0x7f;
	w83792d_write_value(client, W83792D_REG_PWM[nr],
		((data->pwm_mode[nr]) << 7) | pwm_mode_mask);

	return count;
}

#define sysfs_pwm_mode(offset) \
static SENSOR_DEVICE_ATTR(pwm##offset##_mode, S_IRUGO | S_IWUSR, \
				show_pwm_mode, store_pwm_mode, offset);

sysfs_pwm_mode(1);
sysfs_pwm_mode(2);
sysfs_pwm_mode(3);

#define device_create_file_pwm_mode(client, offset) \
do { \
device_create_file(&client->dev, &sensor_dev_attr_pwm##offset##_mode.dev_attr); \
} while (0)


static ssize_t
show_regs_chassis(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%d\n", data->chassis);
}

static DEVICE_ATTR(chassis, S_IRUGO, show_regs_chassis, NULL);

#define device_create_file_chassis(client) \
do { \
device_create_file(&client->dev, &dev_attr_chassis); \
} while (0)


static ssize_t
show_chassis_clear(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%d\n", data->chassis_clear);
}

static ssize_t
store_chassis_clear(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	u32 val;
	u8 temp1 = 0, temp2 = 0;

	val = simple_strtoul(buf, NULL, 10);

	data->chassis_clear = SENSORS_LIMIT(val, 0 ,1);
	temp1 = ((data->chassis_clear) << 7) & 0x80;
	temp2 = w83792d_read_value(client,
		W83792D_REG_CHASSIS_CLR) & 0x7f;
	w83792d_write_value(client, W83792D_REG_CHASSIS_CLR, temp1 | temp2);

	return count;
}

static DEVICE_ATTR(chassis_clear, S_IRUGO | S_IWUSR,
		show_chassis_clear, store_chassis_clear);

#define device_create_file_chassis_clear(client) \
do { \
device_create_file(&client->dev, &dev_attr_chassis_clear); \
} while (0)



/* For Smart Fan I / Thermal Cruise */
static ssize_t
show_thermal_cruise(struct device *dev, struct device_attribute *attr,
			char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%ld\n", (long)data->thermal_cruise[nr-1]);
}

static ssize_t
store_thermal_cruise(struct device *dev, struct device_attribute *attr,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index - 1;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	u32 val;
	u8 target_tmp=0, target_mask=0;

	val = simple_strtoul(buf, NULL, 10);
	target_tmp = val;
	target_tmp = target_tmp & 0x7f;
	target_mask = w83792d_read_value(client, W83792D_REG_THERMAL[nr]) & 0x80;
	data->thermal_cruise[nr] = SENSORS_LIMIT(target_tmp, 0, 255);
	w83792d_write_value(client, W83792D_REG_THERMAL[nr],
		(data->thermal_cruise[nr]) | target_mask);

	return count;
}

#define sysfs_thermal_cruise(offset) \
static SENSOR_DEVICE_ATTR(thermal_cruise##offset, S_IRUGO | S_IWUSR, \
			show_thermal_cruise, store_thermal_cruise, offset);

sysfs_thermal_cruise(1);
sysfs_thermal_cruise(2);
sysfs_thermal_cruise(3);

#define device_create_file_thermal_cruise(client, offset) \
do { \
device_create_file(&client->dev, \
&sensor_dev_attr_thermal_cruise##offset.dev_attr); \
} while (0)


/* For Smart Fan I/Thermal Cruise and Smart Fan II */
static ssize_t
show_tolerance(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%ld\n", (long)data->tolerance[nr-1]);
}

static ssize_t
store_tolerance(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
	int nr = sensor_attr->index - 1;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	u32 val;
	u8 tol_tmp, tol_mask;

	val = simple_strtoul(buf, NULL, 10);
	tol_mask = w83792d_read_value(client,
		W83792D_REG_TOLERANCE[nr]) & ((nr == 1) ? 0x0f : 0xf0);
	tol_tmp = SENSORS_LIMIT(val, 0, 15);
	tol_tmp &= 0x0f;
	data->tolerance[nr] = tol_tmp;
	if (nr == 1) {
		tol_tmp <<= 4;
	}
	w83792d_write_value(client, W83792D_REG_TOLERANCE[nr],
		tol_mask | tol_tmp);

	return count;
}

#define sysfs_tolerance(offset) \
static SENSOR_DEVICE_ATTR(tolerance##offset, S_IRUGO | S_IWUSR, \
				show_tolerance, store_tolerance, offset);

sysfs_tolerance(1);
sysfs_tolerance(2);
sysfs_tolerance(3);

#define device_create_file_tolerance(client, offset) \
do { \
device_create_file(&client->dev, &sensor_dev_attr_tolerance##offset.dev_attr); \
} while (0)


/* For Smart Fan II */
static ssize_t
show_sf2_point(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int index = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%ld\n", (long)data->sf2_points[index-1][nr-1]);
}

static ssize_t
store_sf2_point(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr - 1;
	int index = sensor_attr->index - 1;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	u32 val;
	u8 mask_tmp = 0;

	val = simple_strtoul(buf, NULL, 10);
	data->sf2_points[index][nr] = SENSORS_LIMIT(val, 0, 127);
	mask_tmp = w83792d_read_value(client,
					W83792D_REG_POINTS[index][nr]) & 0x80;
	w83792d_write_value(client, W83792D_REG_POINTS[index][nr],
		mask_tmp|data->sf2_points[index][nr]);

	return count;
}

#define sysfs_sf2_point(offset, index) \
static SENSOR_DEVICE_ATTR_2(sf2_point##offset##_fan##index, S_IRUGO | S_IWUSR, \
				show_sf2_point, store_sf2_point, offset, index);

sysfs_sf2_point(1, 1);	/* Fan1 */
sysfs_sf2_point(2, 1);	/* Fan1 */
sysfs_sf2_point(3, 1);	/* Fan1 */
sysfs_sf2_point(4, 1);	/* Fan1 */
sysfs_sf2_point(1, 2);	/* Fan2 */
sysfs_sf2_point(2, 2);	/* Fan2 */
sysfs_sf2_point(3, 2);	/* Fan2 */
sysfs_sf2_point(4, 2);	/* Fan2 */
sysfs_sf2_point(1, 3);	/* Fan3 */
sysfs_sf2_point(2, 3);	/* Fan3 */
sysfs_sf2_point(3, 3);	/* Fan3 */
sysfs_sf2_point(4, 3);	/* Fan3 */

#define device_create_file_sf2_point(client, offset, index) \
do { \
device_create_file(&client->dev, \
&sensor_dev_attr_sf2_point##offset##_fan##index.dev_attr); \
} while (0)


static ssize_t
show_sf2_level(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int index = sensor_attr->index;
	struct w83792d_data *data = w83792d_update_device(dev);
	return sprintf(buf, "%d\n",
			(((data->sf2_levels[index-1][nr]) * 100) / 15));
}

static ssize_t
store_sf2_level(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct sensor_device_attribute_2 *sensor_attr = to_sensor_dev_attr_2(attr);
	int nr = sensor_attr->nr;
	int index = sensor_attr->index - 1;
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	u32 val;
	u8 mask_tmp=0, level_tmp=0;

	val = simple_strtoul(buf, NULL, 10);
	data->sf2_levels[index][nr] = SENSORS_LIMIT((val * 15) / 100, 0, 15);
	mask_tmp = w83792d_read_value(client, W83792D_REG_LEVELS[index][nr])
		& ((nr==3) ? 0xf0 : 0x0f);
	if (nr==3) {
		level_tmp = data->sf2_levels[index][nr];
	} else {
		level_tmp = data->sf2_levels[index][nr] << 4;
	}
	w83792d_write_value(client, W83792D_REG_LEVELS[index][nr], level_tmp | mask_tmp);

	return count;
}

#define sysfs_sf2_level(offset, index) \
static SENSOR_DEVICE_ATTR_2(sf2_level##offset##_fan##index, S_IRUGO | S_IWUSR, \
				show_sf2_level, store_sf2_level, offset, index);

sysfs_sf2_level(1, 1);	/* Fan1 */
sysfs_sf2_level(2, 1);	/* Fan1 */
sysfs_sf2_level(3, 1);	/* Fan1 */
sysfs_sf2_level(1, 2);	/* Fan2 */
sysfs_sf2_level(2, 2);	/* Fan2 */
sysfs_sf2_level(3, 2);	/* Fan2 */
sysfs_sf2_level(1, 3);	/* Fan3 */
sysfs_sf2_level(2, 3);	/* Fan3 */
sysfs_sf2_level(3, 3);	/* Fan3 */

#define device_create_file_sf2_level(client, offset, index) \
do { \
device_create_file(&client->dev, \
&sensor_dev_attr_sf2_level##offset##_fan##index.dev_attr); \
} while (0)


/* This function is called when:
     * w83792d_driver is inserted (when this module is loaded), for each
       available adapter
     * when a new adapter is inserted (and w83792d_driver is still present) */
static int
w83792d_attach_adapter(struct i2c_adapter *adapter)
{
	if (!(adapter->class & I2C_CLASS_HWMON))
		return 0;
	return i2c_probe(adapter, &addr_data, w83792d_detect);
}


static int
w83792d_create_subclient(struct i2c_adapter *adapter,
				struct i2c_client *new_client, int addr,
				struct i2c_client **sub_cli)
{
	int err;
	struct i2c_client *sub_client;

	(*sub_cli) = sub_client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
	if (!(sub_client)) {
		return -ENOMEM;
	}
	memset(sub_client, 0x00, sizeof(struct i2c_client));
	sub_client->addr = 0x48 + addr;
	i2c_set_clientdata(sub_client, NULL);
	sub_client->adapter = adapter;
	sub_client->driver = &w83792d_driver;
	sub_client->flags = 0;
	strlcpy(sub_client->name, "w83792d subclient", I2C_NAME_SIZE);
	if ((err = i2c_attach_client(sub_client))) {
		dev_err(&new_client->dev, "subclient registration "
			"at address 0x%x failed\n", sub_client->addr);
		kfree(sub_client);
		return err;
	}
	return 0;
}


static int
w83792d_detect_subclients(struct i2c_adapter *adapter, int address, int kind,
		struct i2c_client *new_client)
{
	int i, id, err;
	u8 val;
	struct w83792d_data *data = i2c_get_clientdata(new_client);

	id = i2c_adapter_id(adapter);
	if (force_subclients[0] == id && force_subclients[1] == address) {
		for (i = 2; i <= 3; i++) {
			if (force_subclients[i] < 0x48 ||
			    force_subclients[i] > 0x4f) {
				dev_err(&new_client->dev, "invalid subclient "
					"address %d; must be 0x48-0x4f\n",
					force_subclients[i]);
				err = -ENODEV;
				goto ERROR_SC_0;
			}
		}
		w83792d_write_value(new_client, W83792D_REG_I2C_SUBADDR,
					(force_subclients[2] & 0x07) |
					((force_subclients[3] & 0x07) << 4));
	}

	val = w83792d_read_value(new_client, W83792D_REG_I2C_SUBADDR);
	if (!(val & 0x08)) {
		err = w83792d_create_subclient(adapter, new_client, val & 0x7,
						&data->lm75[0]);
		if (err < 0)
			goto ERROR_SC_0;
	}
	if (!(val & 0x80)) {
		if ((data->lm75[0] != NULL) &&
			((val & 0x7) == ((val >> 4) & 0x7))) {
			dev_err(&new_client->dev, "duplicate addresses 0x%x, "
				"use force_subclient\n", data->lm75[0]->addr);
			err = -ENODEV;
			goto ERROR_SC_1;
		}
		err = w83792d_create_subclient(adapter, new_client,
						(val >> 4) & 0x7, &data->lm75[1]);
		if (err < 0)
			goto ERROR_SC_1;
	}

	return 0;

/* Undo inits in case of errors */

ERROR_SC_1:
	if (data->lm75[0] != NULL) {
		i2c_detach_client(data->lm75[0]);
		kfree(data->lm75[0]);
	}
ERROR_SC_0:
	return err;
}


static int
w83792d_detect(struct i2c_adapter *adapter, int address, int kind)
{
	int i = 0, val1 = 0, val2;
	struct i2c_client *new_client;
	struct w83792d_data *data;
	int err = 0;
	const char *client_name = "";

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
		goto ERROR0;
	}

	/* OK. For now, we presume we have a valid client. We now create the
	   client structure, even though we cannot fill it completely yet.
	   But it allows us to access w83792d_{read,write}_value. */

	if (!(data = kmalloc(sizeof(struct w83792d_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto ERROR0;
	}
	memset(data, 0, sizeof(struct w83792d_data));

	new_client = &data->client;
	i2c_set_clientdata(new_client, data);
	new_client->addr = address;
	init_MUTEX(&data->lock);
	new_client->adapter = adapter;
	new_client->driver = &w83792d_driver;
	new_client->flags = 0;

	/* Now, we do the remaining detection. */

	/* The w83792d may be stuck in some other bank than bank 0. This may
	   make reading other information impossible. Specify a force=... or
	   force_*=... parameter, and the Winbond will be reset to the right
	   bank. */
	if (kind < 0) {
		if (w83792d_read_value(new_client, W83792D_REG_CONFIG) & 0x80) {
			dev_warn(&new_client->dev, "Detection failed at step "
				"3\n");
			goto ERROR1;
		}
		val1 = w83792d_read_value(new_client, W83792D_REG_BANK);
		val2 = w83792d_read_value(new_client, W83792D_REG_CHIPMAN);
		/* Check for Winbond ID if in bank 0 */
		if (!(val1 & 0x07)) {  /* is Bank0 */
			if (((!(val1 & 0x80)) && (val2 != 0xa3)) ||
			     ((val1 & 0x80) && (val2 != 0x5c))) {
				goto ERROR1;
			}
		}
		/* If Winbond chip, address of chip and W83792D_REG_I2C_ADDR
		   should match */
		if (w83792d_read_value(new_client,
					W83792D_REG_I2C_ADDR) != address) {
			dev_warn(&new_client->dev, "Detection failed "
				"at step 5\n");
			goto ERROR1;
		}
	}

	/* We have either had a force parameter, or we have already detected the
	   Winbond. Put it now into bank 0 and Vendor ID High Byte */
	w83792d_write_value(new_client,
			    W83792D_REG_BANK,
			    (w83792d_read_value(new_client,
				W83792D_REG_BANK) & 0x78) | 0x80);

	/* Determine the chip type. */
	if (kind <= 0) {
		/* get vendor ID */
		val2 = w83792d_read_value(new_client, W83792D_REG_CHIPMAN);
		if (val2 != 0x5c) {  /* the vendor is NOT Winbond */
			goto ERROR1;
		}
		val1 = w83792d_read_value(new_client, W83792D_REG_WCHIPID);
		if (val1 == 0x7a && address >= 0x2c) {
			kind = w83792d;
		} else {
			if (kind == 0)
					dev_warn(&new_client->dev,
					"w83792d: Ignoring 'force' parameter for"
					" unknown chip at adapter %d, address"
					" 0x%02x\n", i2c_adapter_id(adapter),
					address);
			goto ERROR1;
		}
	}

	if (kind == w83792d) {
		client_name = "w83792d";
	} else {
		dev_err(&new_client->dev, "w83792d: Internal error: unknown"
					  " kind (%d)?!?", kind);
		goto ERROR1;
	}

	/* Fill in the remaining client fields and put into the global list */
	strlcpy(new_client->name, client_name, I2C_NAME_SIZE);
	data->type = kind;

	data->valid = 0;
	init_MUTEX(&data->update_lock);

	/* Tell the I2C layer a new client has arrived */
	if ((err = i2c_attach_client(new_client)))
		goto ERROR1;

	if ((err = w83792d_detect_subclients(adapter, address,
			kind, new_client)))
		goto ERROR2;

	/* Initialize the chip */
	w83792d_init_client(new_client);

	/* A few vars need to be filled upon startup */
	for (i = 1; i <= 7; i++) {
		data->fan_min[i - 1] = w83792d_read_value(new_client,
					W83792D_REG_FAN_MIN[i]);
	}

	/* Register sysfs hooks */
	data->class_dev = hwmon_device_register(&new_client->dev);
	if (IS_ERR(data->class_dev)) {
		err = PTR_ERR(data->class_dev);
		goto ERROR3;
	}
	device_create_file_in(new_client, 0);
	device_create_file_in(new_client, 1);
	device_create_file_in(new_client, 2);
	device_create_file_in(new_client, 3);
	device_create_file_in(new_client, 4);
	device_create_file_in(new_client, 5);
	device_create_file_in(new_client, 6);
	device_create_file_in(new_client, 7);
	device_create_file_in(new_client, 8);

	device_create_file_fan(new_client, 1);
	device_create_file_fan(new_client, 2);
	device_create_file_fan(new_client, 3);
	device_create_file_fan(new_client, 4);
	device_create_file_fan(new_client, 5);
	device_create_file_fan(new_client, 6);
	device_create_file_fan(new_client, 7);

	device_create_file_temp1(new_client);		/* Temp1 */
	device_create_file_temp_add(new_client, 2);	/* Temp2 */
	device_create_file_temp_add(new_client, 3);	/* Temp3 */

	device_create_file_alarms(new_client);

	device_create_file_pwm(new_client, 1);
	device_create_file_pwm(new_client, 2);
	device_create_file_pwm(new_client, 3);

	device_create_file_pwmenable(new_client, 1);
	device_create_file_pwmenable(new_client, 2);
	device_create_file_pwmenable(new_client, 3);

	device_create_file_pwm_mode(new_client, 1);
	device_create_file_pwm_mode(new_client, 2);
	device_create_file_pwm_mode(new_client, 3);

	device_create_file_chassis(new_client);
	device_create_file_chassis_clear(new_client);

	device_create_file_thermal_cruise(new_client, 1);
	device_create_file_thermal_cruise(new_client, 2);
	device_create_file_thermal_cruise(new_client, 3);

	device_create_file_tolerance(new_client, 1);
	device_create_file_tolerance(new_client, 2);
	device_create_file_tolerance(new_client, 3);

	device_create_file_sf2_point(new_client, 1, 1);	/* Fan1 */
	device_create_file_sf2_point(new_client, 2, 1);	/* Fan1 */
	device_create_file_sf2_point(new_client, 3, 1);	/* Fan1 */
	device_create_file_sf2_point(new_client, 4, 1);	/* Fan1 */
	device_create_file_sf2_point(new_client, 1, 2);	/* Fan2 */
	device_create_file_sf2_point(new_client, 2, 2);	/* Fan2 */
	device_create_file_sf2_point(new_client, 3, 2);	/* Fan2 */
	device_create_file_sf2_point(new_client, 4, 2);	/* Fan2 */
	device_create_file_sf2_point(new_client, 1, 3);	/* Fan3 */
	device_create_file_sf2_point(new_client, 2, 3);	/* Fan3 */
	device_create_file_sf2_point(new_client, 3, 3);	/* Fan3 */
	device_create_file_sf2_point(new_client, 4, 3);	/* Fan3 */

	device_create_file_sf2_level(new_client, 1, 1);	/* Fan1 */
	device_create_file_sf2_level(new_client, 2, 1);	/* Fan1 */
	device_create_file_sf2_level(new_client, 3, 1);	/* Fan1 */
	device_create_file_sf2_level(new_client, 1, 2);	/* Fan2 */
	device_create_file_sf2_level(new_client, 2, 2);	/* Fan2 */
	device_create_file_sf2_level(new_client, 3, 2);	/* Fan2 */
	device_create_file_sf2_level(new_client, 1, 3);	/* Fan3 */
	device_create_file_sf2_level(new_client, 2, 3);	/* Fan3 */
	device_create_file_sf2_level(new_client, 3, 3);	/* Fan3 */

	return 0;

ERROR3:
	if (data->lm75[0] != NULL) {
		i2c_detach_client(data->lm75[0]);
		kfree(data->lm75[0]);
	}
	if (data->lm75[1] != NULL) {
		i2c_detach_client(data->lm75[1]);
		kfree(data->lm75[1]);
	}
ERROR2:
	i2c_detach_client(new_client);
ERROR1:
	kfree(data);
ERROR0:
	return err;
}

static int
w83792d_detach_client(struct i2c_client *client)
{
	struct w83792d_data *data = i2c_get_clientdata(client);
	int err;

	/* main client */
	if (data)
		hwmon_device_unregister(data->class_dev);

	if ((err = i2c_detach_client(client)))
		return err;

	/* main client */
	if (data)
		kfree(data);
	/* subclient */
	else
		kfree(client);

	return 0;
}

/* The SMBus locks itself, usually, but nothing may access the Winbond between
   bank switches. ISA access must always be locked explicitly!
   We ignore the W83792D BUSY flag at this moment - it could lead to deadlocks,
   would slow down the W83792D access and should not be necessary.
   There are some ugly typecasts here, but the good news is - they should
   nowhere else be necessary! */
static int
w83792d_read_value(struct i2c_client *client, u8 reg)
{
	int res=0;
	res = i2c_smbus_read_byte_data(client, reg);

	return res;
}

static int
w83792d_write_value(struct i2c_client *client, u8 reg, u8 value)
{
	i2c_smbus_write_byte_data(client, reg,  value);
	return 0;
}

static void
w83792d_init_client(struct i2c_client *client)
{
	u8 temp2_cfg, temp3_cfg, vid_in_b;

	if (init) {
		w83792d_write_value(client, W83792D_REG_CONFIG, 0x80);
	}
	/* Clear the bit6 of W83792D_REG_VID_IN_B(set it into 0):
	   W83792D_REG_VID_IN_B bit6 = 0: the high/low limit of
	     vin0/vin1 can be modified by user;
	   W83792D_REG_VID_IN_B bit6 = 1: the high/low limit of
	     vin0/vin1 auto-updated, can NOT be modified by user. */
	vid_in_b = w83792d_read_value(client, W83792D_REG_VID_IN_B);
	w83792d_write_value(client, W83792D_REG_VID_IN_B,
			    vid_in_b & 0xbf);

	temp2_cfg = w83792d_read_value(client, W83792D_REG_TEMP2_CONFIG);
	temp3_cfg = w83792d_read_value(client, W83792D_REG_TEMP3_CONFIG);
	w83792d_write_value(client, W83792D_REG_TEMP2_CONFIG,
				temp2_cfg & 0xe6);
	w83792d_write_value(client, W83792D_REG_TEMP3_CONFIG,
				temp3_cfg & 0xe6);

	/* Start monitoring */
	w83792d_write_value(client, W83792D_REG_CONFIG,
			    (w83792d_read_value(client,
						W83792D_REG_CONFIG) & 0xf7)
			    | 0x01);
}

static struct w83792d_data *w83792d_update_device(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct w83792d_data *data = i2c_get_clientdata(client);
	int i, j;
	u8 reg_array_tmp[4], pwm_array_tmp[7], reg_tmp;

	down(&data->update_lock);

	if (time_after
	    (jiffies - data->last_updated, (unsigned long) (HZ * 3))
	    || time_before(jiffies, data->last_updated) || !data->valid) {
		dev_dbg(dev, "Starting device update\n");

		/* Update the voltages measured value and limits */
		for (i = 0; i < 9; i++) {
			data->in[i] = w83792d_read_value(client,
						W83792D_REG_IN[i]);
			data->in_max[i] = w83792d_read_value(client,
						W83792D_REG_IN_MAX[i]);
			data->in_min[i] = w83792d_read_value(client,
						W83792D_REG_IN_MIN[i]);
		}
		data->low_bits[0] = w83792d_read_value(client,
						W83792D_REG_LOW_BITS1);
		data->low_bits[1] = w83792d_read_value(client,
						W83792D_REG_LOW_BITS2);
		for (i = 0; i < 7; i++) {
			/* Update the Fan measured value and limits */
			data->fan[i] = w83792d_read_value(client,
						W83792D_REG_FAN[i]);
			data->fan_min[i] = w83792d_read_value(client,
						W83792D_REG_FAN_MIN[i]);
			/* Update the PWM/DC Value and PWM/DC flag */
			pwm_array_tmp[i] = w83792d_read_value(client,
						W83792D_REG_PWM[i]);
			data->pwm[i] = pwm_array_tmp[i] & 0x0f;
			data->pwm_mode[i] = (pwm_array_tmp[i] >> 7) & 0x01;
		}

		reg_tmp = w83792d_read_value(client, W83792D_REG_FAN_CFG);
		data->pwmenable[0] = reg_tmp & 0x03;
		data->pwmenable[1] = (reg_tmp>>2) & 0x03;
		data->pwmenable[2] = (reg_tmp>>4) & 0x03;

		for (i = 0; i < 3; i++) {
			data->temp1[i] = w83792d_read_value(client,
							W83792D_REG_TEMP1[i]);
		}
		for (i = 0; i < 2; i++) {
			for (j = 0; j < 6; j++) {
				data->temp_add[i][j] = w83792d_read_value(
					client,W83792D_REG_TEMP_ADD[i][j]);
			}
		}

		/* Update the Fan Divisor */
		for (i = 0; i < 4; i++) {
			reg_array_tmp[i] = w83792d_read_value(client,
							W83792D_REG_FAN_DIV[i]);
		}
		data->fan_div[0] = reg_array_tmp[0] & 0x07;
		data->fan_div[1] = (reg_array_tmp[0] >> 4) & 0x07;
		data->fan_div[2] = reg_array_tmp[1] & 0x07;
		data->fan_div[3] = (reg_array_tmp[1] >> 4) & 0x07;
		data->fan_div[4] = reg_array_tmp[2] & 0x07;
		data->fan_div[5] = (reg_array_tmp[2] >> 4) & 0x07;
		data->fan_div[6] = reg_array_tmp[3] & 0x07;

		/* Update the realtime status */
		data->alarms = w83792d_read_value(client, W83792D_REG_ALARM1) +
			(w83792d_read_value(client, W83792D_REG_ALARM2) << 8) +
			(w83792d_read_value(client, W83792D_REG_ALARM3) << 16);

		/* Update CaseOpen status and it's CLR_CHS. */
		data->chassis = (w83792d_read_value(client,
			W83792D_REG_CHASSIS) >> 5) & 0x01;
		data->chassis_clear = (w83792d_read_value(client,
			W83792D_REG_CHASSIS_CLR) >> 7) & 0x01;

		/* Update Thermal Cruise/Smart Fan I target value */
		for (i = 0; i < 3; i++) {
			data->thermal_cruise[i] =
				w83792d_read_value(client,
				W83792D_REG_THERMAL[i]) & 0x7f;
		}

		/* Update Smart Fan I/II tolerance */
		reg_tmp = w83792d_read_value(client, W83792D_REG_TOLERANCE[0]);
		data->tolerance[0] = reg_tmp & 0x0f;
		data->tolerance[1] = (reg_tmp >> 4) & 0x0f;
		data->tolerance[2] = w83792d_read_value(client,
					W83792D_REG_TOLERANCE[2]) & 0x0f;

		/* Update Smart Fan II temperature points */
		for (i = 0; i < 3; i++) {
			for (j = 0; j < 4; j++) {
				data->sf2_points[i][j] = w83792d_read_value(
					client,W83792D_REG_POINTS[i][j]) & 0x7f;
			}
		}

		/* Update Smart Fan II duty cycle levels */
		for (i = 0; i < 3; i++) {
			reg_tmp = w83792d_read_value(client,
						W83792D_REG_LEVELS[i][0]);
			data->sf2_levels[i][0] = reg_tmp & 0x0f;
			data->sf2_levels[i][1] = (reg_tmp >> 4) & 0x0f;
			reg_tmp = w83792d_read_value(client,
						W83792D_REG_LEVELS[i][2]);
			data->sf2_levels[i][2] = (reg_tmp >> 4) & 0x0f;
			data->sf2_levels[i][3] = reg_tmp & 0x0f;
		}

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

	up(&data->update_lock);

#ifdef DEBUG
	w83792d_print_debug(data, dev);
#endif

	return data;
}

#ifdef DEBUG
static void w83792d_print_debug(struct w83792d_data *data, struct device *dev)
{
	int i=0, j=0;
	dev_dbg(dev, "==========The following is the debug message...========\n");
	dev_dbg(dev, "9 set of Voltages: =====>\n");
	for (i=0; i<9; i++) {
		dev_dbg(dev, "vin[%d] is: 0x%x\n", i, data->in[i]);
		dev_dbg(dev, "vin[%d] max is: 0x%x\n", i, data->in_max[i]);
		dev_dbg(dev, "vin[%d] min is: 0x%x\n", i, data->in_min[i]);
	}
	dev_dbg(dev, "Low Bit1 is: 0x%x\n", data->low_bits[0]);
	dev_dbg(dev, "Low Bit2 is: 0x%x\n", data->low_bits[1]);
	dev_dbg(dev, "7 set of Fan Counts and Duty Cycles: =====>\n");
	for (i=0; i<7; i++) {
		dev_dbg(dev, "fan[%d] is: 0x%x\n", i, data->fan[i]);
		dev_dbg(dev, "fan[%d] min is: 0x%x\n", i, data->fan_min[i]);
		dev_dbg(dev, "pwm[%d]     is: 0x%x\n", i, data->pwm[i]);
		dev_dbg(dev, "pwm_mode[%d] is: 0x%x\n", i, data->pwm_mode[i]);
	}
	dev_dbg(dev, "3 set of Temperatures: =====>\n");
	for (i=0; i<3; i++) {
		dev_dbg(dev, "temp1[%d] is: 0x%x\n", i, data->temp1[i]);
	}

	for (i=0; i<2; i++) {
		for (j=0; j<6; j++) {
			dev_dbg(dev, "temp_add[%d][%d] is: 0x%x\n", i, j,
							data->temp_add[i][j]);
		}
	}

	for (i=0; i<7; i++) {
		dev_dbg(dev, "fan_div[%d] is: 0x%x\n", i, data->fan_div[i]);
	}
	dev_dbg(dev, "==========End of the debug message...==================\n");
	dev_dbg(dev, "\n");
}
#endif

static int __init
sensors_w83792d_init(void)
{
	return i2c_add_driver(&w83792d_driver);
}

static void __exit
sensors_w83792d_exit(void)
{
	i2c_del_driver(&w83792d_driver);
}

MODULE_AUTHOR("Chunhao Huang @ Winbond <DZShen@Winbond.com.tw>");
MODULE_DESCRIPTION("W83792AD/D driver for linux-2.6");
MODULE_LICENSE("GPL");

module_init(sensors_w83792d_init);
module_exit(sensors_w83792d_exit);