/*
    w83781d.c - Part of lm_sensors, Linux kernel modules for hardware
                monitoring
    Copyright (c) 1998 - 2001  Frodo Looijaard <frodol@dds.nl>,
                               Philip Edelbrock <phil@netroedge.com>,
                               and Mark Studebaker <mdsxyz123@yahoo.com>
    Copyright (c) 2007 - 2008  Jean Delvare <khali@linux-fr.org>

    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 following chips:

    Chip	#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA
    as99127f	7	3	0	3	0x31	0x12c3	yes	no
    as99127f rev.2 (type_name = as99127f)	0x31	0x5ca3	yes	no
    w83781d	7	3	0	3	0x10-1	0x5ca3	yes	yes
    w83782d	9	3	2-4	3	0x30	0x5ca3	yes	yes
    w83783s	5-6	3	2	1-2	0x40	0x5ca3	yes	no

*/

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

#ifdef CONFIG_ISA
#include <linux/platform_device.h>
#include <linux/ioport.h>
#include <asm/io.h>
#endif

#include "lm75.h"

/* Addresses to scan */
static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
						0x2e, 0x2f, I2C_CLIENT_END };
/* Insmod parameters */
I2C_CLIENT_INSMOD_4(w83781d, w83782d, w83783s, as99127f);

static unsigned short force_subclients[4];
module_param_array(force_subclients, short, NULL, 0);
MODULE_PARM_DESC(force_subclients, "List of subclient addresses: "
		    "{bus, clientaddr, subclientaddr1, subclientaddr2}");

static int reset;
module_param(reset, bool, 0);
MODULE_PARM_DESC(reset, "Set to one to reset chip on load");

static int init = 1;
module_param(init, bool, 0);
MODULE_PARM_DESC(init, "Set to zero to bypass chip initialization");

/* Constants specified below */

/* Length of ISA address segment */
#define W83781D_EXTENT			8

/* Where are the ISA address/data registers relative to the base address */
#define W83781D_ADDR_REG_OFFSET		5
#define W83781D_DATA_REG_OFFSET		6

/* The device registers */
/* in nr from 0 to 8 */
#define W83781D_REG_IN_MAX(nr)		((nr < 7) ? (0x2b + (nr) * 2) : \
						    (0x554 + (((nr) - 7) * 2)))
#define W83781D_REG_IN_MIN(nr)		((nr < 7) ? (0x2c + (nr) * 2) : \
						    (0x555 + (((nr) - 7) * 2)))
#define W83781D_REG_IN(nr)		((nr < 7) ? (0x20 + (nr)) : \
						    (0x550 + (nr) - 7))

/* fan nr from 0 to 2 */
#define W83781D_REG_FAN_MIN(nr)		(0x3b + (nr))
#define W83781D_REG_FAN(nr)		(0x28 + (nr))

#define W83781D_REG_BANK		0x4E
#define W83781D_REG_TEMP2_CONFIG	0x152
#define W83781D_REG_TEMP3_CONFIG	0x252
/* temp nr from 1 to 3 */
#define W83781D_REG_TEMP(nr)		((nr == 3) ? (0x0250) : \
					((nr == 2) ? (0x0150) : \
						     (0x27)))
#define W83781D_REG_TEMP_HYST(nr)	((nr == 3) ? (0x253) : \
					((nr == 2) ? (0x153) : \
						     (0x3A)))
#define W83781D_REG_TEMP_OVER(nr)	((nr == 3) ? (0x255) : \
					((nr == 2) ? (0x155) : \
						     (0x39)))

#define W83781D_REG_CONFIG		0x40

/* Interrupt status (W83781D, AS99127F) */
#define W83781D_REG_ALARM1		0x41
#define W83781D_REG_ALARM2		0x42

/* Real-time status (W83782D, W83783S) */
#define W83782D_REG_ALARM1		0x459
#define W83782D_REG_ALARM2		0x45A
#define W83782D_REG_ALARM3		0x45B

#define W83781D_REG_BEEP_CONFIG		0x4D
#define W83781D_REG_BEEP_INTS1		0x56
#define W83781D_REG_BEEP_INTS2		0x57
#define W83781D_REG_BEEP_INTS3		0x453	/* not on W83781D */

#define W83781D_REG_VID_FANDIV		0x47

#define W83781D_REG_CHIPID		0x49
#define W83781D_REG_WCHIPID		0x58
#define W83781D_REG_CHIPMAN		0x4F
#define W83781D_REG_PIN			0x4B

/* 782D/783S only */
#define W83781D_REG_VBAT		0x5D

/* PWM 782D (1-4) and 783S (1-2) only */
static const u8 W83781D_REG_PWM[] = { 0x5B, 0x5A, 0x5E, 0x5F };
#define W83781D_REG_PWMCLK12		0x5C
#define W83781D_REG_PWMCLK34		0x45C

#define W83781D_REG_I2C_ADDR		0x48
#define W83781D_REG_I2C_SUBADDR		0x4A

/* The following are undocumented in the data sheets however we
   received the information in an email from Winbond tech support */
/* Sensor selection - not on 781d */
#define W83781D_REG_SCFG1		0x5D
static const u8 BIT_SCFG1[] = { 0x02, 0x04, 0x08 };

#define W83781D_REG_SCFG2		0x59
static const u8 BIT_SCFG2[] = { 0x10, 0x20, 0x40 };

#define W83781D_DEFAULT_BETA		3435

/* Conversions */
#define IN_TO_REG(val)			SENSORS_LIMIT(((val) + 8) / 16, 0, 255)
#define IN_FROM_REG(val)		((val) * 16)

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);
}

static inline long
FAN_FROM_REG(u8 val, int div)
{
	if (val == 0)
		return -1;
	if (val == 255)
		return 0;
	return 1350000 / (val * div);
}

#define TEMP_TO_REG(val)		SENSORS_LIMIT((val) / 1000, -127, 128)
#define TEMP_FROM_REG(val)		((val) * 1000)

#define BEEP_MASK_FROM_REG(val,type)	((type) == as99127f ? \
					 (~(val)) & 0x7fff : (val) & 0xff7fff)
#define BEEP_MASK_TO_REG(val,type)	((type) == as99127f ? \
					 (~(val)) & 0x7fff : (val) & 0xff7fff)

#define DIV_FROM_REG(val)		(1 << (val))

static inline u8
DIV_TO_REG(long val, enum chips type)
{
	int i;
	val = SENSORS_LIMIT(val, 1,
			    ((type == w83781d
			      || type == as99127f) ? 8 : 128)) >> 1;
	for (i = 0; i < 7; i++) {
		if (val == 0)
			break;
		val >>= 1;
	}
	return i;
}

struct w83781d_data {
	struct i2c_client *client;
	struct device *hwmon_dev;
	struct mutex lock;
	enum chips type;

	/* For ISA device only */
	const char *name;
	int isa_addr;

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

	struct i2c_client *lm75[2];	/* for secondary I2C addresses */
	/* array of 2 pointers to subclients */

	u8 in[9];		/* Register value - 8 & 9 for 782D only */
	u8 in_max[9];		/* Register value - 8 & 9 for 782D only */
	u8 in_min[9];		/* Register value - 8 & 9 for 782D only */
	u8 fan[3];		/* Register value */
	u8 fan_min[3];		/* Register value */
	s8 temp;		/* Register value */
	s8 temp_max;		/* Register value */
	s8 temp_max_hyst;	/* Register value */
	u16 temp_add[2];	/* Register value */
	u16 temp_max_add[2];	/* Register value */
	u16 temp_max_hyst_add[2];	/* Register value */
	u8 fan_div[3];		/* Register encoding, shifted right */
	u8 vid;			/* Register encoding, combined */
	u32 alarms;		/* Register encoding, combined */
	u32 beep_mask;		/* Register encoding, combined */
	u8 pwm[4];		/* Register value */
	u8 pwm2_enable;		/* Boolean */
	u16 sens[3];		/* 782D/783S only.
				   1 = pentium diode; 2 = 3904 diode;
				   4 = thermistor */
	u8 vrm;
};

static struct w83781d_data *w83781d_data_if_isa(void);
static int w83781d_alias_detect(struct i2c_client *client, u8 chipid);

static int w83781d_read_value(struct w83781d_data *data, u16 reg);
static int w83781d_write_value(struct w83781d_data *data, u16 reg, u16 value);
static struct w83781d_data *w83781d_update_device(struct device *dev);
static void w83781d_init_device(struct device *dev);

/* following are the sysfs callback functions */
#define show_in_reg(reg) \
static ssize_t show_##reg (struct device *dev, struct device_attribute *da, \
		char *buf) \
{ \
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
	struct w83781d_data *data = w83781d_update_device(dev); \
	return sprintf(buf, "%ld\n", \
		       (long)IN_FROM_REG(data->reg[attr->index])); \
}
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 \
		*da, const char *buf, size_t count) \
{ \
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
	struct w83781d_data *data = dev_get_drvdata(dev); \
	int nr = attr->index; \
	u32 val; \
	 \
	val = simple_strtoul(buf, NULL, 10); \
	 \
	mutex_lock(&data->update_lock); \
	data->in_##reg[nr] = IN_TO_REG(val); \
	w83781d_write_value(data, W83781D_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);

#define sysfs_in_offsets(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_offsets(0);
sysfs_in_offsets(1);
sysfs_in_offsets(2);
sysfs_in_offsets(3);
sysfs_in_offsets(4);
sysfs_in_offsets(5);
sysfs_in_offsets(6);
sysfs_in_offsets(7);
sysfs_in_offsets(8);

#define show_fan_reg(reg) \
static ssize_t show_##reg (struct device *dev, struct device_attribute *da, \
		char *buf) \
{ \
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
	struct w83781d_data *data = w83781d_update_device(dev); \
	return sprintf(buf,"%ld\n", \
		FAN_FROM_REG(data->reg[attr->index], \
			DIV_FROM_REG(data->fan_div[attr->index]))); \
}
show_fan_reg(fan);
show_fan_reg(fan_min);

static ssize_t
store_fan_min(struct device *dev, struct device_attribute *da,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct w83781d_data *data = dev_get_drvdata(dev);
	int nr = attr->index;
	u32 val;

	val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->fan_min[nr] =
	    FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
	w83781d_write_value(data, W83781D_REG_FAN_MIN(nr),
			    data->fan_min[nr]);

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

static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0);
static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
		show_fan_min, store_fan_min, 0);
static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1);
static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO | S_IWUSR,
		show_fan_min, store_fan_min, 1);
static SENSOR_DEVICE_ATTR(fan3_input, S_IRUGO, show_fan, NULL, 2);
static SENSOR_DEVICE_ATTR(fan3_min, S_IRUGO | S_IWUSR,
		show_fan_min, store_fan_min, 2);

#define show_temp_reg(reg) \
static ssize_t show_##reg (struct device *dev, struct device_attribute *da, \
		char *buf) \
{ \
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
	struct w83781d_data *data = w83781d_update_device(dev); \
	int nr = attr->index; \
	if (nr >= 2) {	/* TEMP2 and TEMP3 */ \
		return sprintf(buf,"%d\n", \
			LM75_TEMP_FROM_REG(data->reg##_add[nr-2])); \
	} else {	/* TEMP1 */ \
		return sprintf(buf,"%ld\n", (long)TEMP_FROM_REG(data->reg)); \
	} \
}
show_temp_reg(temp);
show_temp_reg(temp_max);
show_temp_reg(temp_max_hyst);

#define store_temp_reg(REG, reg) \
static ssize_t store_temp_##reg (struct device *dev, \
		struct device_attribute *da, const char *buf, size_t count) \
{ \
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
	struct w83781d_data *data = dev_get_drvdata(dev); \
	int nr = attr->index; \
	long val; \
	 \
	val = simple_strtol(buf, NULL, 10); \
	 \
	mutex_lock(&data->update_lock); \
	 \
	if (nr >= 2) {	/* TEMP2 and TEMP3 */ \
		data->temp_##reg##_add[nr-2] = LM75_TEMP_TO_REG(val); \
		w83781d_write_value(data, W83781D_REG_TEMP_##REG(nr), \
				data->temp_##reg##_add[nr-2]); \
	} else {	/* TEMP1 */ \
		data->temp_##reg = TEMP_TO_REG(val); \
		w83781d_write_value(data, W83781D_REG_TEMP_##REG(nr), \
			data->temp_##reg); \
	} \
	 \
	mutex_unlock(&data->update_lock); \
	return count; \
}
store_temp_reg(OVER, max);
store_temp_reg(HYST, max_hyst);

#define sysfs_temp_offsets(offset) \
static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO, \
		show_temp, NULL, offset); \
static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR, \
		show_temp_max, store_temp_max, offset); \
static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR, \
		show_temp_max_hyst, store_temp_max_hyst, offset);

sysfs_temp_offsets(1);
sysfs_temp_offsets(2);
sysfs_temp_offsets(3);

static ssize_t
show_vid_reg(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83781d_data *data = w83781d_update_device(dev);
	return sprintf(buf, "%ld\n", (long) vid_from_reg(data->vid, data->vrm));
}

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

static ssize_t
show_vrm_reg(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83781d_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%ld\n", (long) data->vrm);
}

static ssize_t
store_vrm_reg(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
	struct w83781d_data *data = dev_get_drvdata(dev);
	u32 val;

	val = simple_strtoul(buf, NULL, 10);
	data->vrm = val;

	return count;
}

static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm_reg, store_vrm_reg);

static ssize_t
show_alarms_reg(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83781d_data *data = w83781d_update_device(dev);
	return sprintf(buf, "%u\n", data->alarms);
}

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

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct w83781d_data *data = w83781d_update_device(dev);
	int bitnr = to_sensor_dev_attr(attr)->index;
	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}

/* The W83781D has a single alarm bit for temp2 and temp3 */
static ssize_t show_temp3_alarm(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct w83781d_data *data = w83781d_update_device(dev);
	int bitnr = (data->type == w83781d) ? 5 : 13;
	return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 9);
static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 10);
static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 16);
static SENSOR_DEVICE_ATTR(in8_alarm, S_IRUGO, show_alarm, NULL, 17);
static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_temp3_alarm, NULL, 0);

static ssize_t show_beep_mask (struct device *dev, struct device_attribute *attr, char *buf)
{
	struct w83781d_data *data = w83781d_update_device(dev);
	return sprintf(buf, "%ld\n",
		       (long)BEEP_MASK_FROM_REG(data->beep_mask, data->type));
}

static ssize_t
store_beep_mask(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct w83781d_data *data = dev_get_drvdata(dev);
	u32 val;

	val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->beep_mask &= 0x8000; /* preserve beep enable */
	data->beep_mask |= BEEP_MASK_TO_REG(val, data->type);
	w83781d_write_value(data, W83781D_REG_BEEP_INTS1,
			    data->beep_mask & 0xff);
	w83781d_write_value(data, W83781D_REG_BEEP_INTS2,
			    (data->beep_mask >> 8) & 0xff);
	if (data->type != w83781d && data->type != as99127f) {
		w83781d_write_value(data, W83781D_REG_BEEP_INTS3,
				    ((data->beep_mask) >> 16) & 0xff);
	}
	mutex_unlock(&data->update_lock);

	return count;
}

static DEVICE_ATTR(beep_mask, S_IRUGO | S_IWUSR,
		show_beep_mask, store_beep_mask);

static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
		char *buf)
{
	struct w83781d_data *data = w83781d_update_device(dev);
	int bitnr = to_sensor_dev_attr(attr)->index;
	return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
}

static ssize_t
store_beep(struct device *dev, struct device_attribute *attr,
		const char *buf, size_t count)
{
	struct w83781d_data *data = dev_get_drvdata(dev);
	int bitnr = to_sensor_dev_attr(attr)->index;
	unsigned long bit;
	u8 reg;

	bit = simple_strtoul(buf, NULL, 10);
	if (bit & ~1)
		return -EINVAL;

	mutex_lock(&data->update_lock);
	if (bit)
		data->beep_mask |= (1 << bitnr);
	else
		data->beep_mask &= ~(1 << bitnr);

	if (bitnr < 8) {
		reg = w83781d_read_value(data, W83781D_REG_BEEP_INTS1);
		if (bit)
			reg |= (1 << bitnr);
		else
			reg &= ~(1 << bitnr);
		w83781d_write_value(data, W83781D_REG_BEEP_INTS1, reg);
	} else if (bitnr < 16) {
		reg = w83781d_read_value(data, W83781D_REG_BEEP_INTS2);
		if (bit)
			reg |= (1 << (bitnr - 8));
		else
			reg &= ~(1 << (bitnr - 8));
		w83781d_write_value(data, W83781D_REG_BEEP_INTS2, reg);
	} else {
		reg = w83781d_read_value(data, W83781D_REG_BEEP_INTS3);
		if (bit)
			reg |= (1 << (bitnr - 16));
		else
			reg &= ~(1 << (bitnr - 16));
		w83781d_write_value(data, W83781D_REG_BEEP_INTS3, reg);
	}
	mutex_unlock(&data->update_lock);

	return count;
}

/* The W83781D has a single beep bit for temp2 and temp3 */
static ssize_t show_temp3_beep(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct w83781d_data *data = w83781d_update_device(dev);
	int bitnr = (data->type == w83781d) ? 5 : 13;
	return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
}

static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 0);
static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 1);
static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 2);
static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 3);
static SENSOR_DEVICE_ATTR(in4_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 8);
static SENSOR_DEVICE_ATTR(in5_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 9);
static SENSOR_DEVICE_ATTR(in6_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 10);
static SENSOR_DEVICE_ATTR(in7_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 16);
static SENSOR_DEVICE_ATTR(in8_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 17);
static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 6);
static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 7);
static SENSOR_DEVICE_ATTR(fan3_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 11);
static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 4);
static SENSOR_DEVICE_ATTR(temp2_beep, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 5);
static SENSOR_DEVICE_ATTR(temp3_beep, S_IRUGO,
			show_temp3_beep, store_beep, 13);
static SENSOR_DEVICE_ATTR(beep_enable, S_IRUGO | S_IWUSR,
			show_beep, store_beep, 15);

static ssize_t
show_fan_div(struct device *dev, struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct w83781d_data *data = w83781d_update_device(dev);
	return sprintf(buf, "%ld\n",
		       (long) DIV_FROM_REG(data->fan_div[attr->index]));
}

/* 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 surprise; 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 *da,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct w83781d_data *data = dev_get_drvdata(dev);
	unsigned long min;
	int nr = attr->index;
	u8 reg;
	unsigned long val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);

	/* 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(val, data->type);

	reg = (w83781d_read_value(data, nr==2 ? W83781D_REG_PIN : W83781D_REG_VID_FANDIV)
	       & (nr==0 ? 0xcf : 0x3f))
	    | ((data->fan_div[nr] & 0x03) << (nr==0 ? 4 : 6));
	w83781d_write_value(data, nr==2 ? W83781D_REG_PIN : W83781D_REG_VID_FANDIV, reg);

	/* w83781d and as99127f don't have extended divisor bits */
	if (data->type != w83781d && data->type != as99127f) {
		reg = (w83781d_read_value(data, W83781D_REG_VBAT)
		       & ~(1 << (5 + nr)))
		    | ((data->fan_div[nr] & 0x04) << (3 + nr));
		w83781d_write_value(data, W83781D_REG_VBAT, reg);
	}

	/* Restore fan_min */
	data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
	w83781d_write_value(data, W83781D_REG_FAN_MIN(nr), data->fan_min[nr]);

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

static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
		show_fan_div, store_fan_div, 0);
static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
		show_fan_div, store_fan_div, 1);
static SENSOR_DEVICE_ATTR(fan3_div, S_IRUGO | S_IWUSR,
		show_fan_div, store_fan_div, 2);

static ssize_t
show_pwm(struct device *dev, struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct w83781d_data *data = w83781d_update_device(dev);
	return sprintf(buf, "%d\n", (int)data->pwm[attr->index]);
}

static ssize_t
show_pwm2_enable(struct device *dev, struct device_attribute *da, char *buf)
{
	struct w83781d_data *data = w83781d_update_device(dev);
	return sprintf(buf, "%d\n", (int)data->pwm2_enable);
}

static ssize_t
store_pwm(struct device *dev, struct device_attribute *da, const char *buf,
		size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct w83781d_data *data = dev_get_drvdata(dev);
	int nr = attr->index;
	u32 val;

	val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);
	data->pwm[nr] = SENSORS_LIMIT(val, 0, 255);
	w83781d_write_value(data, W83781D_REG_PWM[nr], data->pwm[nr]);
	mutex_unlock(&data->update_lock);
	return count;
}

static ssize_t
store_pwm2_enable(struct device *dev, struct device_attribute *da,
		const char *buf, size_t count)
{
	struct w83781d_data *data = dev_get_drvdata(dev);
	u32 val, reg;

	val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);

	switch (val) {
	case 0:
	case 1:
		reg = w83781d_read_value(data, W83781D_REG_PWMCLK12);
		w83781d_write_value(data, W83781D_REG_PWMCLK12,
				    (reg & 0xf7) | (val << 3));

		reg = w83781d_read_value(data, W83781D_REG_BEEP_CONFIG);
		w83781d_write_value(data, W83781D_REG_BEEP_CONFIG,
				    (reg & 0xef) | (!val << 4));

		data->pwm2_enable = val;
		break;

	default:
		mutex_unlock(&data->update_lock);
		return -EINVAL;
	}

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

static SENSOR_DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 0);
static SENSOR_DEVICE_ATTR(pwm2, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 1);
static SENSOR_DEVICE_ATTR(pwm3, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 2);
static SENSOR_DEVICE_ATTR(pwm4, S_IRUGO | S_IWUSR, show_pwm, store_pwm, 3);
/* only PWM2 can be enabled/disabled */
static DEVICE_ATTR(pwm2_enable, S_IRUGO | S_IWUSR,
		show_pwm2_enable, store_pwm2_enable);

static ssize_t
show_sensor(struct device *dev, struct device_attribute *da, char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct w83781d_data *data = w83781d_update_device(dev);
	return sprintf(buf, "%d\n", (int)data->sens[attr->index]);
}

static ssize_t
store_sensor(struct device *dev, struct device_attribute *da,
		const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct w83781d_data *data = dev_get_drvdata(dev);
	int nr = attr->index;
	u32 val, tmp;

	val = simple_strtoul(buf, NULL, 10);

	mutex_lock(&data->update_lock);

	switch (val) {
	case 1:		/* PII/Celeron diode */
		tmp = w83781d_read_value(data, W83781D_REG_SCFG1);
		w83781d_write_value(data, W83781D_REG_SCFG1,
				    tmp | BIT_SCFG1[nr]);
		tmp = w83781d_read_value(data, W83781D_REG_SCFG2);
		w83781d_write_value(data, W83781D_REG_SCFG2,
				    tmp | BIT_SCFG2[nr]);
		data->sens[nr] = val;
		break;
	case 2:		/* 3904 */
		tmp = w83781d_read_value(data, W83781D_REG_SCFG1);
		w83781d_write_value(data, W83781D_REG_SCFG1,
				    tmp | BIT_SCFG1[nr]);
		tmp = w83781d_read_value(data, W83781D_REG_SCFG2);
		w83781d_write_value(data, W83781D_REG_SCFG2,
				    tmp & ~BIT_SCFG2[nr]);
		data->sens[nr] = val;
		break;
	case W83781D_DEFAULT_BETA:
		dev_warn(dev, "Sensor type %d is deprecated, please use 4 "
			 "instead\n", W83781D_DEFAULT_BETA);
		/* fall through */
	case 4:		/* thermistor */
		tmp = w83781d_read_value(data, W83781D_REG_SCFG1);
		w83781d_write_value(data, W83781D_REG_SCFG1,
				    tmp & ~BIT_SCFG1[nr]);
		data->sens[nr] = val;
		break;
	default:
		dev_err(dev, "Invalid sensor type %ld; must be 1, 2, or 4\n",
		       (long) val);
		break;
	}

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

static SENSOR_DEVICE_ATTR(temp1_type, S_IRUGO | S_IWUSR,
	show_sensor, store_sensor, 0);
static SENSOR_DEVICE_ATTR(temp2_type, S_IRUGO | S_IWUSR,
	show_sensor, store_sensor, 1);
static SENSOR_DEVICE_ATTR(temp3_type, S_IRUGO | S_IWUSR,
	show_sensor, store_sensor, 2);

/* Assumes that adapter is of I2C, not ISA variety.
 * OTHERWISE DON'T CALL THIS
 */
static int
w83781d_detect_subclients(struct i2c_client *new_client)
{
	int i, val1 = 0, id;
	int err;
	int address = new_client->addr;
	unsigned short sc_addr[2];
	struct i2c_adapter *adapter = new_client->adapter;
	struct w83781d_data *data = i2c_get_clientdata(new_client);
	enum chips kind = data->type;

	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 = -EINVAL;
				goto ERROR_SC_1;
			}
		}
		w83781d_write_value(data, W83781D_REG_I2C_SUBADDR,
				(force_subclients[2] & 0x07) |
				((force_subclients[3] & 0x07) << 4));
		sc_addr[0] = force_subclients[2];
	} else {
		val1 = w83781d_read_value(data, W83781D_REG_I2C_SUBADDR);
		sc_addr[0] = 0x48 + (val1 & 0x07);
	}

	if (kind != w83783s) {
		if (force_subclients[0] == id &&
		    force_subclients[1] == address) {
			sc_addr[1] = force_subclients[3];
		} else {
			sc_addr[1] = 0x48 + ((val1 >> 4) & 0x07);
		}
		if (sc_addr[0] == sc_addr[1]) {
			dev_err(&new_client->dev,
			       "Duplicate addresses 0x%x for subclients.\n",
			       sc_addr[0]);
			err = -EBUSY;
			goto ERROR_SC_2;
		}
	}

	for (i = 0; i <= 1; i++) {
		data->lm75[i] = i2c_new_dummy(adapter, sc_addr[i]);
		if (!data->lm75[i]) {
			dev_err(&new_client->dev, "Subclient %d "
				"registration at address 0x%x "
				"failed.\n", i, sc_addr[i]);
			err = -ENOMEM;
			if (i == 1)
				goto ERROR_SC_3;
			goto ERROR_SC_2;
		}
		if (kind == w83783s)
			break;
	}

	return 0;

/* Undo inits in case of errors */
ERROR_SC_3:
	i2c_unregister_device(data->lm75[0]);
ERROR_SC_2:
ERROR_SC_1:
	return err;
}

#define IN_UNIT_ATTRS(X)					\
	&sensor_dev_attr_in##X##_input.dev_attr.attr,		\
	&sensor_dev_attr_in##X##_min.dev_attr.attr,		\
	&sensor_dev_attr_in##X##_max.dev_attr.attr,		\
	&sensor_dev_attr_in##X##_alarm.dev_attr.attr,		\
	&sensor_dev_attr_in##X##_beep.dev_attr.attr

#define FAN_UNIT_ATTRS(X)					\
	&sensor_dev_attr_fan##X##_input.dev_attr.attr,		\
	&sensor_dev_attr_fan##X##_min.dev_attr.attr,		\
	&sensor_dev_attr_fan##X##_div.dev_attr.attr,		\
	&sensor_dev_attr_fan##X##_alarm.dev_attr.attr,		\
	&sensor_dev_attr_fan##X##_beep.dev_attr.attr

#define TEMP_UNIT_ATTRS(X)					\
	&sensor_dev_attr_temp##X##_input.dev_attr.attr,		\
	&sensor_dev_attr_temp##X##_max.dev_attr.attr,		\
	&sensor_dev_attr_temp##X##_max_hyst.dev_attr.attr,	\
	&sensor_dev_attr_temp##X##_alarm.dev_attr.attr,		\
	&sensor_dev_attr_temp##X##_beep.dev_attr.attr

static struct attribute* w83781d_attributes[] = {
	IN_UNIT_ATTRS(0),
	IN_UNIT_ATTRS(2),
	IN_UNIT_ATTRS(3),
	IN_UNIT_ATTRS(4),
	IN_UNIT_ATTRS(5),
	IN_UNIT_ATTRS(6),
	FAN_UNIT_ATTRS(1),
	FAN_UNIT_ATTRS(2),
	FAN_UNIT_ATTRS(3),
	TEMP_UNIT_ATTRS(1),
	TEMP_UNIT_ATTRS(2),
	&dev_attr_cpu0_vid.attr,
	&dev_attr_vrm.attr,
	&dev_attr_alarms.attr,
	&dev_attr_beep_mask.attr,
	&sensor_dev_attr_beep_enable.dev_attr.attr,
	NULL
};
static const struct attribute_group w83781d_group = {
	.attrs = w83781d_attributes,
};

static struct attribute *w83781d_attributes_opt[] = {
	IN_UNIT_ATTRS(1),
	IN_UNIT_ATTRS(7),
	IN_UNIT_ATTRS(8),
	TEMP_UNIT_ATTRS(3),
	&sensor_dev_attr_pwm1.dev_attr.attr,
	&sensor_dev_attr_pwm2.dev_attr.attr,
	&sensor_dev_attr_pwm3.dev_attr.attr,
	&sensor_dev_attr_pwm4.dev_attr.attr,
	&dev_attr_pwm2_enable.attr,
	&sensor_dev_attr_temp1_type.dev_attr.attr,
	&sensor_dev_attr_temp2_type.dev_attr.attr,
	&sensor_dev_attr_temp3_type.dev_attr.attr,
	NULL
};
static const struct attribute_group w83781d_group_opt = {
	.attrs = w83781d_attributes_opt,
};

/* No clean up is done on error, it's up to the caller */
static int
w83781d_create_files(struct device *dev, int kind, int is_isa)
{
	int err;

	if ((err = sysfs_create_group(&dev->kobj, &w83781d_group)))
		return err;

	if (kind != w83783s) {
		if ((err = device_create_file(dev,
				&sensor_dev_attr_in1_input.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in1_min.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in1_max.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in1_alarm.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in1_beep.dev_attr)))
			return err;
	}
	if (kind != as99127f && kind != w83781d && kind != w83783s) {
		if ((err = device_create_file(dev,
				&sensor_dev_attr_in7_input.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in7_min.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in7_max.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in7_alarm.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in7_beep.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in8_input.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in8_min.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in8_max.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in8_alarm.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_in8_beep.dev_attr)))
			return err;
	}
	if (kind != w83783s) {
		if ((err = device_create_file(dev,
				&sensor_dev_attr_temp3_input.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_temp3_max.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_temp3_max_hyst.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_temp3_alarm.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_temp3_beep.dev_attr)))
			return err;

		if (kind != w83781d) {
			err = sysfs_chmod_file(&dev->kobj,
				&sensor_dev_attr_temp3_alarm.dev_attr.attr,
				S_IRUGO | S_IWUSR);
			if (err)
				return err;
		}
	}

	if (kind != w83781d && kind != as99127f) {
		if ((err = device_create_file(dev,
				&sensor_dev_attr_pwm1.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_pwm2.dev_attr))
		    || (err = device_create_file(dev, &dev_attr_pwm2_enable)))
			return err;
	}
	if (kind == w83782d && !is_isa) {
		if ((err = device_create_file(dev,
				&sensor_dev_attr_pwm3.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_pwm4.dev_attr)))
			return err;
	}

	if (kind != as99127f && kind != w83781d) {
		if ((err = device_create_file(dev,
				&sensor_dev_attr_temp1_type.dev_attr))
		    || (err = device_create_file(dev,
				&sensor_dev_attr_temp2_type.dev_attr)))
			return err;
		if (kind != w83783s) {
			if ((err = device_create_file(dev,
					&sensor_dev_attr_temp3_type.dev_attr)))
				return err;
		}
	}

	return 0;
}

/* Return 0 if detection is successful, -ENODEV otherwise */
static int
w83781d_detect(struct i2c_client *client, int kind,
	       struct i2c_board_info *info)
{
	int val1 = 0, val2;
	struct w83781d_data *isa = w83781d_data_if_isa();
	struct i2c_adapter *adapter = client->adapter;
	int address = client->addr;
	const char *client_name = "";
	enum vendor { winbond, asus } vendid;

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

	/* We block updates of the ISA device to minimize the risk of
	   concurrent access to the same W83781D chip through different
	   interfaces. */
	if (isa)
		mutex_lock(&isa->update_lock);

	/* The w8378?d 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 (i2c_smbus_read_byte_data
		    (client, W83781D_REG_CONFIG) & 0x80) {
			dev_dbg(&adapter->dev, "Detection of w83781d chip "
				"failed at step 3\n");
			goto err_nodev;
		}
		val1 = i2c_smbus_read_byte_data(client, W83781D_REG_BANK);
		val2 = i2c_smbus_read_byte_data(client, W83781D_REG_CHIPMAN);
		/* Check for Winbond or Asus ID if in bank 0 */
		if ((!(val1 & 0x07)) &&
		    (((!(val1 & 0x80)) && (val2 != 0xa3) && (val2 != 0xc3))
		     || ((val1 & 0x80) && (val2 != 0x5c) && (val2 != 0x12)))) {
			dev_dbg(&adapter->dev, "Detection of w83781d chip "
				"failed at step 4\n");
			goto err_nodev;
		}
		/* If Winbond SMBus, check address at 0x48.
		   Asus doesn't support, except for as99127f rev.2 */
		if ((!(val1 & 0x80) && (val2 == 0xa3)) ||
		    ((val1 & 0x80) && (val2 == 0x5c))) {
			if (i2c_smbus_read_byte_data
			    (client, W83781D_REG_I2C_ADDR) != address) {
				dev_dbg(&adapter->dev, "Detection of w83781d "
					"chip failed at step 5\n");
				goto err_nodev;
			}
		}
	}

	/* 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 */
	i2c_smbus_write_byte_data(client, W83781D_REG_BANK,
		(i2c_smbus_read_byte_data(client, W83781D_REG_BANK)
		 & 0x78) | 0x80);

	/* Determine the chip type. */
	if (kind <= 0) {
		/* get vendor ID */
		val2 = i2c_smbus_read_byte_data(client, W83781D_REG_CHIPMAN);
		if (val2 == 0x5c)
			vendid = winbond;
		else if (val2 == 0x12)
			vendid = asus;
		else {
			dev_dbg(&adapter->dev, "w83781d chip vendor is "
				"neither Winbond nor Asus\n");
			goto err_nodev;
		}

		val1 = i2c_smbus_read_byte_data(client, W83781D_REG_WCHIPID);
		if ((val1 == 0x10 || val1 == 0x11) && vendid == winbond)
			kind = w83781d;
		else if (val1 == 0x30 && vendid == winbond)
			kind = w83782d;
		else if (val1 == 0x40 && vendid == winbond && address == 0x2d)
			kind = w83783s;
		else if (val1 == 0x31)
			kind = as99127f;
		else {
			if (kind == 0)
				dev_warn(&adapter->dev, "Ignoring 'force' "
					 "parameter for unknown chip at "
					 "address 0x%02x\n", address);
			goto err_nodev;
		}

		if ((kind == w83781d || kind == w83782d)
		 && w83781d_alias_detect(client, val1)) {
			dev_dbg(&adapter->dev, "Device at 0x%02x appears to "
				"be the same as ISA device\n", address);
			goto err_nodev;
		}
	}

	if (isa)
		mutex_unlock(&isa->update_lock);

	if (kind == w83781d) {
		client_name = "w83781d";
	} else if (kind == w83782d) {
		client_name = "w83782d";
	} else if (kind == w83783s) {
		client_name = "w83783s";
	} else if (kind == as99127f) {
		client_name = "as99127f";
	}

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

	return 0;

 err_nodev:
	if (isa)
		mutex_unlock(&isa->update_lock);
	return -ENODEV;
}

static int
w83781d_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct w83781d_data *data;
	int err;

	data = kzalloc(sizeof(struct w83781d_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto ERROR1;
	}

	i2c_set_clientdata(client, data);
	mutex_init(&data->lock);
	mutex_init(&data->update_lock);

	data->type = id->driver_data;
	data->client = client;

	/* attach secondary i2c lm75-like clients */
	err = w83781d_detect_subclients(client);
	if (err)
		goto ERROR3;

	/* Initialize the chip */
	w83781d_init_device(dev);

	/* Register sysfs hooks */
	err = w83781d_create_files(dev, data->type, 0);
	if (err)
		goto ERROR4;

	data->hwmon_dev = hwmon_device_register(dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto ERROR4;
	}

	return 0;

ERROR4:
	sysfs_remove_group(&dev->kobj, &w83781d_group);
	sysfs_remove_group(&dev->kobj, &w83781d_group_opt);

	if (data->lm75[0])
		i2c_unregister_device(data->lm75[0]);
	if (data->lm75[1])
		i2c_unregister_device(data->lm75[1]);
ERROR3:
	i2c_set_clientdata(client, NULL);
	kfree(data);
ERROR1:
	return err;
}

static int
w83781d_remove(struct i2c_client *client)
{
	struct w83781d_data *data = i2c_get_clientdata(client);
	struct device *dev = &client->dev;

	hwmon_device_unregister(data->hwmon_dev);

	sysfs_remove_group(&dev->kobj, &w83781d_group);
	sysfs_remove_group(&dev->kobj, &w83781d_group_opt);

	if (data->lm75[0])
		i2c_unregister_device(data->lm75[0]);
	if (data->lm75[1])
		i2c_unregister_device(data->lm75[1]);

	i2c_set_clientdata(client, NULL);
	kfree(data);

	return 0;
}

static int
w83781d_read_value_i2c(struct w83781d_data *data, u16 reg)
{
	struct i2c_client *client = data->client;
	int res, bank;
	struct i2c_client *cl;

	bank = (reg >> 8) & 0x0f;
	if (bank > 2)
		/* switch banks */
		i2c_smbus_write_byte_data(client, W83781D_REG_BANK,
					  bank);
	if (bank == 0 || bank > 2) {
		res = i2c_smbus_read_byte_data(client, reg & 0xff);
	} else {
		/* switch to subclient */
		cl = data->lm75[bank - 1];
		/* convert from ISA to LM75 I2C addresses */
		switch (reg & 0xff) {
		case 0x50:	/* TEMP */
			res = swab16(i2c_smbus_read_word_data(cl, 0));
			break;
		case 0x52:	/* CONFIG */
			res = i2c_smbus_read_byte_data(cl, 1);
			break;
		case 0x53:	/* HYST */
			res = swab16(i2c_smbus_read_word_data(cl, 2));
			break;
		case 0x55:	/* OVER */
		default:
			res = swab16(i2c_smbus_read_word_data(cl, 3));
			break;
		}
	}
	if (bank > 2)
		i2c_smbus_write_byte_data(client, W83781D_REG_BANK, 0);

	return res;
}

static int
w83781d_write_value_i2c(struct w83781d_data *data, u16 reg, u16 value)
{
	struct i2c_client *client = data->client;
	int bank;
	struct i2c_client *cl;

	bank = (reg >> 8) & 0x0f;
	if (bank > 2)
		/* switch banks */
		i2c_smbus_write_byte_data(client, W83781D_REG_BANK,
					  bank);
	if (bank == 0 || bank > 2) {
		i2c_smbus_write_byte_data(client, reg & 0xff,
					  value & 0xff);
	} else {
		/* switch to subclient */
		cl = data->lm75[bank - 1];
		/* convert from ISA to LM75 I2C addresses */
		switch (reg & 0xff) {
		case 0x52:	/* CONFIG */
			i2c_smbus_write_byte_data(cl, 1, value & 0xff);
			break;
		case 0x53:	/* HYST */
			i2c_smbus_write_word_data(cl, 2, swab16(value));
			break;
		case 0x55:	/* OVER */
			i2c_smbus_write_word_data(cl, 3, swab16(value));
			break;
		}
	}
	if (bank > 2)
		i2c_smbus_write_byte_data(client, W83781D_REG_BANK, 0);

	return 0;
}

static void
w83781d_init_device(struct device *dev)
{
	struct w83781d_data *data = dev_get_drvdata(dev);
	int i, p;
	int type = data->type;
	u8 tmp;

	if (reset && type != as99127f) { /* this resets registers we don't have
					   documentation for on the as99127f */
		/* Resetting the chip has been the default for a long time,
		   but it causes the BIOS initializations (fan clock dividers,
		   thermal sensor types...) to be lost, so it is now optional.
		   It might even go away if nobody reports it as being useful,
		   as I see very little reason why this would be needed at
		   all. */
		dev_info(dev, "If reset=1 solved a problem you were "
			 "having, please report!\n");

		/* save these registers */
		i = w83781d_read_value(data, W83781D_REG_BEEP_CONFIG);
		p = w83781d_read_value(data, W83781D_REG_PWMCLK12);
		/* Reset all except Watchdog values and last conversion values
		   This sets fan-divs to 2, among others */
		w83781d_write_value(data, W83781D_REG_CONFIG, 0x80);
		/* Restore the registers and disable power-on abnormal beep.
		   This saves FAN 1/2/3 input/output values set by BIOS. */
		w83781d_write_value(data, W83781D_REG_BEEP_CONFIG, i | 0x80);
		w83781d_write_value(data, W83781D_REG_PWMCLK12, p);
		/* Disable master beep-enable (reset turns it on).
		   Individual beep_mask should be reset to off but for some reason
		   disabling this bit helps some people not get beeped */
		w83781d_write_value(data, W83781D_REG_BEEP_INTS2, 0);
	}

	/* Disable power-on abnormal beep, as advised by the datasheet.
	   Already done if reset=1. */
	if (init && !reset && type != as99127f) {
		i = w83781d_read_value(data, W83781D_REG_BEEP_CONFIG);
		w83781d_write_value(data, W83781D_REG_BEEP_CONFIG, i | 0x80);
	}

	data->vrm = vid_which_vrm();

	if ((type != w83781d) && (type != as99127f)) {
		tmp = w83781d_read_value(data, W83781D_REG_SCFG1);
		for (i = 1; i <= 3; i++) {
			if (!(tmp & BIT_SCFG1[i - 1])) {
				data->sens[i - 1] = 4;
			} else {
				if (w83781d_read_value
				    (data,
				     W83781D_REG_SCFG2) & BIT_SCFG2[i - 1])
					data->sens[i - 1] = 1;
				else
					data->sens[i - 1] = 2;
			}
			if (type == w83783s && i == 2)
				break;
		}
	}

	if (init && type != as99127f) {
		/* Enable temp2 */
		tmp = w83781d_read_value(data, W83781D_REG_TEMP2_CONFIG);
		if (tmp & 0x01) {
			dev_warn(dev, "Enabling temp2, readings "
				 "might not make sense\n");
			w83781d_write_value(data, W83781D_REG_TEMP2_CONFIG,
				tmp & 0xfe);
		}

		/* Enable temp3 */
		if (type != w83783s) {
			tmp = w83781d_read_value(data,
				W83781D_REG_TEMP3_CONFIG);
			if (tmp & 0x01) {
				dev_warn(dev, "Enabling temp3, "
					 "readings might not make sense\n");
				w83781d_write_value(data,
					W83781D_REG_TEMP3_CONFIG, tmp & 0xfe);
			}
		}
	}

	/* Start monitoring */
	w83781d_write_value(data, W83781D_REG_CONFIG,
			    (w83781d_read_value(data,
						W83781D_REG_CONFIG) & 0xf7)
			    | 0x01);

	/* A few vars need to be filled upon startup */
	for (i = 0; i < 3; i++) {
		data->fan_min[i] = w83781d_read_value(data,
					W83781D_REG_FAN_MIN(i));
	}

	mutex_init(&data->update_lock);
}

static struct w83781d_data *w83781d_update_device(struct device *dev)
{
	struct w83781d_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	int i;

	mutex_lock(&data->update_lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	    || !data->valid) {
		dev_dbg(dev, "Starting device update\n");

		for (i = 0; i <= 8; i++) {
			if (data->type == w83783s && i == 1)
				continue;	/* 783S has no in1 */
			data->in[i] =
			    w83781d_read_value(data, W83781D_REG_IN(i));
			data->in_min[i] =
			    w83781d_read_value(data, W83781D_REG_IN_MIN(i));
			data->in_max[i] =
			    w83781d_read_value(data, W83781D_REG_IN_MAX(i));
			if ((data->type != w83782d) && (i == 6))
				break;
		}
		for (i = 0; i < 3; i++) {
			data->fan[i] =
			    w83781d_read_value(data, W83781D_REG_FAN(i));
			data->fan_min[i] =
			    w83781d_read_value(data, W83781D_REG_FAN_MIN(i));
		}
		if (data->type != w83781d && data->type != as99127f) {
			for (i = 0; i < 4; i++) {
				data->pwm[i] =
				    w83781d_read_value(data,
						       W83781D_REG_PWM[i]);
				if ((data->type != w83782d || !client->driver)
				    && i == 1)
					break;
			}
			/* Only PWM2 can be disabled */
			data->pwm2_enable = (w83781d_read_value(data,
					      W83781D_REG_PWMCLK12) & 0x08) >> 3;
		}

		data->temp = w83781d_read_value(data, W83781D_REG_TEMP(1));
		data->temp_max =
		    w83781d_read_value(data, W83781D_REG_TEMP_OVER(1));
		data->temp_max_hyst =
		    w83781d_read_value(data, W83781D_REG_TEMP_HYST(1));
		data->temp_add[0] =
		    w83781d_read_value(data, W83781D_REG_TEMP(2));
		data->temp_max_add[0] =
		    w83781d_read_value(data, W83781D_REG_TEMP_OVER(2));
		data->temp_max_hyst_add[0] =
		    w83781d_read_value(data, W83781D_REG_TEMP_HYST(2));
		if (data->type != w83783s) {
			data->temp_add[1] =
			    w83781d_read_value(data, W83781D_REG_TEMP(3));
			data->temp_max_add[1] =
			    w83781d_read_value(data,
					       W83781D_REG_TEMP_OVER(3));
			data->temp_max_hyst_add[1] =
			    w83781d_read_value(data,
					       W83781D_REG_TEMP_HYST(3));
		}
		i = w83781d_read_value(data, W83781D_REG_VID_FANDIV);
		data->vid = i & 0x0f;
		data->vid |= (w83781d_read_value(data,
					W83781D_REG_CHIPID) & 0x01) << 4;
		data->fan_div[0] = (i >> 4) & 0x03;
		data->fan_div[1] = (i >> 6) & 0x03;
		data->fan_div[2] = (w83781d_read_value(data,
					W83781D_REG_PIN) >> 6) & 0x03;
		if ((data->type != w83781d) && (data->type != as99127f)) {
			i = w83781d_read_value(data, W83781D_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->type == w83782d) {
			data->alarms = w83781d_read_value(data,
						W83782D_REG_ALARM1)
				     | (w83781d_read_value(data,
						W83782D_REG_ALARM2) << 8)
				     | (w83781d_read_value(data,
						W83782D_REG_ALARM3) << 16);
		} else if (data->type == w83783s) {
			data->alarms = w83781d_read_value(data,
						W83782D_REG_ALARM1)
				     | (w83781d_read_value(data,
						W83782D_REG_ALARM2) << 8);
		} else {
			/* No real-time status registers, fall back to
			   interrupt status registers */
			data->alarms = w83781d_read_value(data,
						W83781D_REG_ALARM1)
				     | (w83781d_read_value(data,
						W83781D_REG_ALARM2) << 8);
		}
		i = w83781d_read_value(data, W83781D_REG_BEEP_INTS2);
		data->beep_mask = (i << 8) +
		    w83781d_read_value(data, W83781D_REG_BEEP_INTS1);
		if ((data->type != w83781d) && (data->type != as99127f)) {
			data->beep_mask |=
			    w83781d_read_value(data,
					       W83781D_REG_BEEP_INTS3) << 16;
		}
		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->update_lock);

	return data;
}

static const struct i2c_device_id w83781d_ids[] = {
	{ "w83781d", w83781d, },
	{ "w83782d", w83782d, },
	{ "w83783s", w83783s, },
	{ "as99127f", as99127f },
	{ /* LIST END */ }
};
MODULE_DEVICE_TABLE(i2c, w83781d_ids);

static struct i2c_driver w83781d_driver = {
	.class		= I2C_CLASS_HWMON,
	.driver = {
		.name = "w83781d",
	},
	.probe		= w83781d_probe,
	.remove		= w83781d_remove,
	.id_table	= w83781d_ids,
	.detect		= w83781d_detect,
	.address_data	= &addr_data,
};

/*
 * ISA related code
 */
#ifdef CONFIG_ISA

/* ISA device, if found */
static struct platform_device *pdev;

static unsigned short isa_address = 0x290;

/* I2C devices get this name attribute automatically, but for ISA devices
   we must create it by ourselves. */
static ssize_t
show_name(struct device *dev, struct device_attribute *devattr, char *buf)
{
	struct w83781d_data *data = dev_get_drvdata(dev);
	return sprintf(buf, "%s\n", data->name);
}
static DEVICE_ATTR(name, S_IRUGO, show_name, NULL);

static struct w83781d_data *w83781d_data_if_isa(void)
{
	return pdev ? platform_get_drvdata(pdev) : NULL;
}

/* Returns 1 if the I2C chip appears to be an alias of the ISA chip */
static int w83781d_alias_detect(struct i2c_client *client, u8 chipid)
{
	struct w83781d_data *isa;
	int i;

	if (!pdev)	/* No ISA chip */
		return 0;

	isa = platform_get_drvdata(pdev);

	if (w83781d_read_value(isa, W83781D_REG_I2C_ADDR) != client->addr)
		return 0;	/* Address doesn't match */
	if (w83781d_read_value(isa, W83781D_REG_WCHIPID) != chipid)
		return 0;	/* Chip type doesn't match */

	/* We compare all the limit registers, the config register and the
	 * interrupt mask registers */
	for (i = 0x2b; i <= 0x3d; i++) {
		if (w83781d_read_value(isa, i) !=
		    i2c_smbus_read_byte_data(client, i))
			return 0;
	}
	if (w83781d_read_value(isa, W83781D_REG_CONFIG) !=
	    i2c_smbus_read_byte_data(client, W83781D_REG_CONFIG))
		return 0;
	for (i = 0x43; i <= 0x46; i++) {
		if (w83781d_read_value(isa, i) !=
		    i2c_smbus_read_byte_data(client, i))
			return 0;
	}

	return 1;
}

static int
w83781d_read_value_isa(struct w83781d_data *data, u16 reg)
{
	int word_sized, res;

	word_sized = (((reg & 0xff00) == 0x100)
		      || ((reg & 0xff00) == 0x200))
	    && (((reg & 0x00ff) == 0x50)
		|| ((reg & 0x00ff) == 0x53)
		|| ((reg & 0x00ff) == 0x55));
	if (reg & 0xff00) {
		outb_p(W83781D_REG_BANK,
		       data->isa_addr + W83781D_ADDR_REG_OFFSET);
		outb_p(reg >> 8,
		       data->isa_addr + W83781D_DATA_REG_OFFSET);
	}
	outb_p(reg & 0xff, data->isa_addr + W83781D_ADDR_REG_OFFSET);
	res = inb_p(data->isa_addr + W83781D_DATA_REG_OFFSET);
	if (word_sized) {
		outb_p((reg & 0xff) + 1,
		       data->isa_addr + W83781D_ADDR_REG_OFFSET);
		res =
		    (res << 8) + inb_p(data->isa_addr +
				       W83781D_DATA_REG_OFFSET);
	}
	if (reg & 0xff00) {
		outb_p(W83781D_REG_BANK,
		       data->isa_addr + W83781D_ADDR_REG_OFFSET);
		outb_p(0, data->isa_addr + W83781D_DATA_REG_OFFSET);
	}
	return res;
}

static void
w83781d_write_value_isa(struct w83781d_data *data, u16 reg, u16 value)
{
	int word_sized;

	word_sized = (((reg & 0xff00) == 0x100)
		      || ((reg & 0xff00) == 0x200))
	    && (((reg & 0x00ff) == 0x53)
		|| ((reg & 0x00ff) == 0x55));
	if (reg & 0xff00) {
		outb_p(W83781D_REG_BANK,
		       data->isa_addr + W83781D_ADDR_REG_OFFSET);
		outb_p(reg >> 8,
		       data->isa_addr + W83781D_DATA_REG_OFFSET);
	}
	outb_p(reg & 0xff, data->isa_addr + W83781D_ADDR_REG_OFFSET);
	if (word_sized) {
		outb_p(value >> 8,
		       data->isa_addr + W83781D_DATA_REG_OFFSET);
		outb_p((reg & 0xff) + 1,
		       data->isa_addr + W83781D_ADDR_REG_OFFSET);
	}
	outb_p(value & 0xff, data->isa_addr + W83781D_DATA_REG_OFFSET);
	if (reg & 0xff00) {
		outb_p(W83781D_REG_BANK,
		       data->isa_addr + W83781D_ADDR_REG_OFFSET);
		outb_p(0, data->isa_addr + W83781D_DATA_REG_OFFSET);
	}
}

/* The SMBus locks itself, usually, but nothing may access the Winbond between
   bank switches. ISA access must always be locked explicitly!
   We ignore the W83781D BUSY flag at this moment - it could lead to deadlocks,
   would slow down the W83781D 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
w83781d_read_value(struct w83781d_data *data, u16 reg)
{
	struct i2c_client *client = data->client;
	int res;

	mutex_lock(&data->lock);
	if (client)
		res = w83781d_read_value_i2c(data, reg);
	else
		res = w83781d_read_value_isa(data, reg);
	mutex_unlock(&data->lock);
	return res;
}

static int
w83781d_write_value(struct w83781d_data *data, u16 reg, u16 value)
{
	struct i2c_client *client = data->client;

	mutex_lock(&data->lock);
	if (client)
		w83781d_write_value_i2c(data, reg, value);
	else
		w83781d_write_value_isa(data, reg, value);
	mutex_unlock(&data->lock);
	return 0;
}

static int __devinit
w83781d_isa_probe(struct platform_device *pdev)
{
	int err, reg;
	struct w83781d_data *data;
	struct resource *res;

	/* Reserve the ISA region */
	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
	if (!request_region(res->start + W83781D_ADDR_REG_OFFSET, 2,
			    "w83781d")) {
		err = -EBUSY;
		goto exit;
	}

	data = kzalloc(sizeof(struct w83781d_data), GFP_KERNEL);
	if (!data) {
		err = -ENOMEM;
		goto exit_release_region;
	}
	mutex_init(&data->lock);
	data->isa_addr = res->start;
	platform_set_drvdata(pdev, data);

	reg = w83781d_read_value(data, W83781D_REG_WCHIPID);
	switch (reg) {
	case 0x30:
		data->type = w83782d;
		data->name = "w83782d";
		break;
	default:
		data->type = w83781d;
		data->name = "w83781d";
	}

	/* Initialize the W83781D chip */
	w83781d_init_device(&pdev->dev);

	/* Register sysfs hooks */
	err = w83781d_create_files(&pdev->dev, data->type, 1);
	if (err)
		goto exit_remove_files;

	err = device_create_file(&pdev->dev, &dev_attr_name);
	if (err)
		goto exit_remove_files;

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

	return 0;

 exit_remove_files:
	sysfs_remove_group(&pdev->dev.kobj, &w83781d_group);
	sysfs_remove_group(&pdev->dev.kobj, &w83781d_group_opt);
	device_remove_file(&pdev->dev, &dev_attr_name);
	kfree(data);
 exit_release_region:
	release_region(res->start + W83781D_ADDR_REG_OFFSET, 2);
 exit:
	return err;
}

static int __devexit
w83781d_isa_remove(struct platform_device *pdev)
{
	struct w83781d_data *data = platform_get_drvdata(pdev);

	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&pdev->dev.kobj, &w83781d_group);
	sysfs_remove_group(&pdev->dev.kobj, &w83781d_group_opt);
	device_remove_file(&pdev->dev, &dev_attr_name);
	release_region(data->isa_addr + W83781D_ADDR_REG_OFFSET, 2);
	kfree(data);

	return 0;
}

static struct platform_driver w83781d_isa_driver = {
	.driver = {
		.owner = THIS_MODULE,
		.name = "w83781d",
	},
	.probe = w83781d_isa_probe,
	.remove = __devexit_p(w83781d_isa_remove),
};

/* return 1 if a supported chip is found, 0 otherwise */
static int __init
w83781d_isa_found(unsigned short address)
{
	int val, save, found = 0;

	/* We have to request the region in two parts because some
	   boards declare base+4 to base+7 as a PNP device */
	if (!request_region(address, 4, "w83781d")) {
		pr_debug("w83781d: Failed to request low part of region\n");
		return 0;
	}
	if (!request_region(address + 4, 4, "w83781d")) {
		pr_debug("w83781d: Failed to request high part of region\n");
		release_region(address, 4);
		return 0;
	}

#define REALLY_SLOW_IO
	/* We need the timeouts for at least some W83781D-like
	   chips. But only if we read 'undefined' registers. */
	val = inb_p(address + 1);
	if (inb_p(address + 2) != val
	 || inb_p(address + 3) != val
	 || inb_p(address + 7) != val) {
		pr_debug("w83781d: Detection failed at step 1\n");
		goto release;
	}
#undef REALLY_SLOW_IO

	/* We should be able to change the 7 LSB of the address port. The
	   MSB (busy flag) should be clear initially, set after the write. */
	save = inb_p(address + W83781D_ADDR_REG_OFFSET);
	if (save & 0x80) {
		pr_debug("w83781d: Detection failed at step 2\n");
		goto release;
	}
	val = ~save & 0x7f;
	outb_p(val, address + W83781D_ADDR_REG_OFFSET);
	if (inb_p(address + W83781D_ADDR_REG_OFFSET) != (val | 0x80)) {
		outb_p(save, address + W83781D_ADDR_REG_OFFSET);
		pr_debug("w83781d: Detection failed at step 3\n");
		goto release;
	}

	/* We found a device, now see if it could be a W83781D */
	outb_p(W83781D_REG_CONFIG, address + W83781D_ADDR_REG_OFFSET);
	val = inb_p(address + W83781D_DATA_REG_OFFSET);
	if (val & 0x80) {
		pr_debug("w83781d: Detection failed at step 4\n");
		goto release;
	}
	outb_p(W83781D_REG_BANK, address + W83781D_ADDR_REG_OFFSET);
	save = inb_p(address + W83781D_DATA_REG_OFFSET);
	outb_p(W83781D_REG_CHIPMAN, address + W83781D_ADDR_REG_OFFSET);
	val = inb_p(address + W83781D_DATA_REG_OFFSET);
	if ((!(save & 0x80) && (val != 0xa3))
	 || ((save & 0x80) && (val != 0x5c))) {
		pr_debug("w83781d: Detection failed at step 5\n");
		goto release;
	}
	outb_p(W83781D_REG_I2C_ADDR, address + W83781D_ADDR_REG_OFFSET);
	val = inb_p(address + W83781D_DATA_REG_OFFSET);
	if (val < 0x03 || val > 0x77) {	/* Not a valid I2C address */
		pr_debug("w83781d: Detection failed at step 6\n");
		goto release;
	}

	/* The busy flag should be clear again */
	if (inb_p(address + W83781D_ADDR_REG_OFFSET) & 0x80) {
		pr_debug("w83781d: Detection failed at step 7\n");
		goto release;
	}

	/* Determine the chip type */
	outb_p(W83781D_REG_BANK, address + W83781D_ADDR_REG_OFFSET);
	save = inb_p(address + W83781D_DATA_REG_OFFSET);
	outb_p(save & 0xf8, address + W83781D_DATA_REG_OFFSET);
	outb_p(W83781D_REG_WCHIPID, address + W83781D_ADDR_REG_OFFSET);
	val = inb_p(address + W83781D_DATA_REG_OFFSET);
	if ((val & 0xfe) == 0x10	/* W83781D */
	 || val == 0x30)		/* W83782D */
		found = 1;

	if (found)
		pr_info("w83781d: Found a %s chip at %#x\n",
			val == 0x30 ? "W83782D" : "W83781D", (int)address);

 release:
	release_region(address + 4, 4);
	release_region(address, 4);
	return found;
}

static int __init
w83781d_isa_device_add(unsigned short address)
{
	struct resource res = {
		.start	= address,
		.end	= address + W83781D_EXTENT - 1,
		.name	= "w83781d",
		.flags	= IORESOURCE_IO,
	};
	int err;

	pdev = platform_device_alloc("w83781d", address);
	if (!pdev) {
		err = -ENOMEM;
		printk(KERN_ERR "w83781d: Device allocation failed\n");
		goto exit;
	}

	err = platform_device_add_resources(pdev, &res, 1);
	if (err) {
		printk(KERN_ERR "w83781d: Device resource addition failed "
		       "(%d)\n", err);
		goto exit_device_put;
	}

	err = platform_device_add(pdev);
	if (err) {
		printk(KERN_ERR "w83781d: Device addition failed (%d)\n",
		       err);
		goto exit_device_put;
	}

	return 0;

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

static int __init
w83781d_isa_register(void)
{
	int res;

	if (w83781d_isa_found(isa_address)) {
		res = platform_driver_register(&w83781d_isa_driver);
		if (res)
			goto exit;

		/* Sets global pdev as a side effect */
		res = w83781d_isa_device_add(isa_address);
		if (res)
			goto exit_unreg_isa_driver;
	}

	return 0;

exit_unreg_isa_driver:
	platform_driver_unregister(&w83781d_isa_driver);
exit:
	return res;
}

static void
w83781d_isa_unregister(void)
{
	if (pdev) {
		platform_device_unregister(pdev);
		platform_driver_unregister(&w83781d_isa_driver);
	}
}
#else /* !CONFIG_ISA */

static struct w83781d_data *w83781d_data_if_isa(void)
{
	return NULL;
}

static int
w83781d_alias_detect(struct i2c_client *client, u8 chipid)
{
	return 0;
}

static int
w83781d_read_value(struct w83781d_data *data, u16 reg)
{
	int res;

	mutex_lock(&data->lock);
	res = w83781d_read_value_i2c(data, reg);
	mutex_unlock(&data->lock);

	return res;
}

static int
w83781d_write_value(struct w83781d_data *data, u16 reg, u16 value)
{
	mutex_lock(&data->lock);
	w83781d_write_value_i2c(data, reg, value);
	mutex_unlock(&data->lock);

	return 0;
}

static int __init
w83781d_isa_register(void)
{
	return 0;
}

static void
w83781d_isa_unregister(void)
{
}
#endif /* CONFIG_ISA */

static int __init
sensors_w83781d_init(void)
{
	int res;

	/* We register the ISA device first, so that we can skip the
	 * registration of an I2C interface to the same device. */
	res = w83781d_isa_register();
	if (res)
		goto exit;

	res = i2c_add_driver(&w83781d_driver);
	if (res)
		goto exit_unreg_isa;

	return 0;

 exit_unreg_isa:
	w83781d_isa_unregister();
 exit:
	return res;
}

static void __exit
sensors_w83781d_exit(void)
{
	w83781d_isa_unregister();
	i2c_del_driver(&w83781d_driver);
}

MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
	      "Philip Edelbrock <phil@netroedge.com>, "
	      "and Mark Studebaker <mdsxyz123@yahoo.com>");
MODULE_DESCRIPTION("W83781D driver");
MODULE_LICENSE("GPL");

module_init(sensors_w83781d_init);
module_exit(sensors_w83781d_exit);
