/*

   * asb100.c - Part of lm_sensors, Linux kernel modules for hardware
   *	      monitoring
   *
   * Copyright (C) 2004 Mark M. Hoffman <mhoffman@lightlink.com>
   *
   * (derived from w83781d.c)
   *
   * Copyright (C) 1998 - 2003  Frodo Looijaard <frodol@dds.nl>,
   *			      Philip Edelbrock <phil@netroedge.com>, and
   *			      Mark Studebaker <mdsxyz123@yahoo.com>
   *
   * 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.
   */

  
  /*

   * This driver supports the hardware sensor chips: Asus ASB100 and
   * ASB100-A "BACH".
   *
   * ASB100-A supports pwm1, while plain ASB100 does not.  There is no known
   * way for the driver to tell which one is there.
   *

   * Chip		#vin	#fanin	#pwm	#temp	wchipid	vendid	i2c	ISA

   * asb100	7	3	1	4	0x31	0x0694	yes	no
   */

  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/i2c.h>

  #include <linux/hwmon.h>

  #include <linux/hwmon-sysfs.h>

  #include <linux/hwmon-vid.h>

  #include <linux/err.h>

  #include <linux/init.h>

  #include <linux/jiffies.h>

  #include <linux/mutex.h>

  #include "lm75.h"

  /* I2C addresses to scan */

  static const unsigned short normal_i2c[] = { 0x2d, I2C_CLIENT_END };

  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}");

  
  /* Voltage IN registers 0-6 */
  #define ASB100_REG_IN(nr)	(0x20 + (nr))
  #define ASB100_REG_IN_MAX(nr)	(0x2b + (nr * 2))
  #define ASB100_REG_IN_MIN(nr)	(0x2c + (nr * 2))
  
  /* FAN IN registers 1-3 */
  #define ASB100_REG_FAN(nr)	(0x28 + (nr))
  #define ASB100_REG_FAN_MIN(nr)	(0x3b + (nr))
  
  /* TEMPERATURE registers 1-4 */
  static const u16 asb100_reg_temp[]	= {0, 0x27, 0x150, 0x250, 0x17};
  static const u16 asb100_reg_temp_max[]	= {0, 0x39, 0x155, 0x255, 0x18};
  static const u16 asb100_reg_temp_hyst[]	= {0, 0x3a, 0x153, 0x253, 0x19};
  
  #define ASB100_REG_TEMP(nr) (asb100_reg_temp[nr])
  #define ASB100_REG_TEMP_MAX(nr) (asb100_reg_temp_max[nr])
  #define ASB100_REG_TEMP_HYST(nr) (asb100_reg_temp_hyst[nr])
  
  #define ASB100_REG_TEMP2_CONFIG	0x0152
  #define ASB100_REG_TEMP3_CONFIG	0x0252
  
  
  #define ASB100_REG_CONFIG	0x40
  #define ASB100_REG_ALARM1	0x41
  #define ASB100_REG_ALARM2	0x42
  #define ASB100_REG_SMIM1	0x43
  #define ASB100_REG_SMIM2	0x44
  #define ASB100_REG_VID_FANDIV	0x47
  #define ASB100_REG_I2C_ADDR	0x48
  #define ASB100_REG_CHIPID	0x49
  #define ASB100_REG_I2C_SUBADDR	0x4a
  #define ASB100_REG_PIN		0x4b
  #define ASB100_REG_IRQ		0x4c
  #define ASB100_REG_BANK		0x4e
  #define ASB100_REG_CHIPMAN	0x4f
  
  #define ASB100_REG_WCHIPID	0x58
  
  /* bit 7 -> enable, bits 0-3 -> duty cycle */
  #define ASB100_REG_PWM1		0x59

  /*
   * CONVERSIONS
   * Rounding and limit checking is only done on the TO_REG variants.
   */

  
  /* These constants are a guess, consistent w/ w83781d */

  #define ASB100_IN_MIN		0
  #define ASB100_IN_MAX		4080

  /*
   * IN: 1/1000 V (0V to 4.08V)
   * REG: 16mV/bit
   */

  static u8 IN_TO_REG(unsigned val)
  {

  	unsigned nval = clamp_val(val, ASB100_IN_MIN, ASB100_IN_MAX);

  	return (nval + 8) / 16;
  }
  
  static unsigned IN_FROM_REG(u8 reg)
  {
  	return reg * 16;
  }
  
  static u8 FAN_TO_REG(long rpm, int div)
  {
  	if (rpm == -1)
  		return 0;
  	if (rpm == 0)
  		return 255;

  	rpm = clamp_val(rpm, 1, 1000000);
  	return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);

  }
  
  static int FAN_FROM_REG(u8 val, int div)
  {

  	return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);

  }
  
  /* These constants are a guess, consistent w/ w83781d */

  #define ASB100_TEMP_MIN		-128000
  #define ASB100_TEMP_MAX		127000

  /*
   * TEMP: 0.001C/bit (-128C to +127C)
   * REG: 1C/bit, two's complement
   */

  static u8 TEMP_TO_REG(long temp)

  {

  	int ntemp = clamp_val(temp, ASB100_TEMP_MIN, ASB100_TEMP_MAX);

  	ntemp += (ntemp < 0 ? -500 : 500);

  	return (u8)(ntemp / 1000);
  }
  
  static int TEMP_FROM_REG(u8 reg)
  {
  	return (s8)reg * 1000;
  }

  /*
   * PWM: 0 - 255 per sensors documentation
   * REG: (6.25% duty cycle per bit)
   */

  static u8 ASB100_PWM_TO_REG(int pwm)
  {

  	pwm = clamp_val(pwm, 0, 255);

  	return (u8)(pwm / 16);
  }
  
  static int ASB100_PWM_FROM_REG(u8 reg)
  {
  	return reg * 16;
  }

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

  /*
   * FAN DIV: 1, 2, 4, or 8 (defaults to 2)
   * REG: 0, 1, 2, or 3 (respectively) (defaults to 1)
   */

  static u8 DIV_TO_REG(long val)
  {

  	return val == 8 ? 3 : val == 4 ? 2 : val == 1 ? 0 : 1;

  }

  /*
   * For each registered client, we need to keep some data in memory. That
   * data is pointed to by client->data. The structure itself is
   * dynamically allocated, at the same time the client itself is allocated.
   */

  struct asb100_data {

  	struct device *hwmon_dev;

  	struct mutex lock;

  	struct mutex update_lock;

  	unsigned long last_updated;	/* In jiffies */
  
  	/* array of 2 pointers to subclients */
  	struct i2c_client *lm75[2];
  
  	char valid;		/* !=0 if following fields are valid */
  	u8 in[7];		/* Register value */
  	u8 in_max[7];		/* Register value */
  	u8 in_min[7];		/* Register value */
  	u8 fan[3];		/* Register value */
  	u8 fan_min[3];		/* Register value */
  	u16 temp[4];		/* Register value (0 and 3 are u8 only) */
  	u16 temp_max[4];	/* Register value (0 and 3 are u8 only) */
  	u16 temp_hyst[4];	/* Register value (0 and 3 are u8 only) */
  	u8 fan_div[3];		/* Register encoding, right justified */
  	u8 pwm;			/* Register encoding */
  	u8 vid;			/* Register encoding, combined */
  	u32 alarms;		/* Register encoding, combined */
  	u8 vrm;
  };
  
  static int asb100_read_value(struct i2c_client *client, u16 reg);
  static void asb100_write_value(struct i2c_client *client, u16 reg, u16 val);

  static int asb100_probe(struct i2c_client *client,
  			const struct i2c_device_id *id);

  static int asb100_detect(struct i2c_client *client,

  			 struct i2c_board_info *info);
  static int asb100_remove(struct i2c_client *client);

  static struct asb100_data *asb100_update_device(struct device *dev);
  static void asb100_init_client(struct i2c_client *client);

  static const struct i2c_device_id asb100_id[] = {

  	{ "asb100", 0 },

  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, asb100_id);

  static struct i2c_driver asb100_driver = {

  	.class		= I2C_CLASS_HWMON,

  	.driver = {

  		.name	= "asb100",
  	},

  	.probe		= asb100_probe,
  	.remove		= asb100_remove,
  	.id_table	= asb100_id,
  	.detect		= asb100_detect,

  	.address_list	= normal_i2c,

  };
  
  /* 7 Voltages */
  #define show_in_reg(reg) \

  static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
  		char *buf) \

  { \

  	int nr = to_sensor_dev_attr(attr)->index; \

  	struct asb100_data *data = asb100_update_device(dev); \
  	return sprintf(buf, "%d
  ", IN_FROM_REG(data->reg[nr])); \
  }
  
  show_in_reg(in)
  show_in_reg(in_min)
  show_in_reg(in_max)
  
  #define set_in_reg(REG, reg) \

  static ssize_t set_in_##reg(struct device *dev, struct device_attribute *attr, \
  		const char *buf, size_t count) \

  { \

  	int nr = to_sensor_dev_attr(attr)->index; \

  	struct i2c_client *client = to_i2c_client(dev); \
  	struct asb100_data *data = i2c_get_clientdata(client); \

  	unsigned long val; \
  	int err = kstrtoul(buf, 10, &val); \
  	if (err) \
  		return err; \

  	mutex_lock(&data->update_lock); \

  	data->in_##reg[nr] = IN_TO_REG(val); \
  	asb100_write_value(client, ASB100_REG_IN_##REG(nr), \
  		data->in_##reg[nr]); \

  	mutex_unlock(&data->update_lock); \

  	return count; \
  }
  
  set_in_reg(MIN, min)
  set_in_reg(MAX, max)
  
  #define sysfs_in(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, set_in_min, offset); \
  static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
  		show_in_max, set_in_max, offset)

  
  sysfs_in(0);
  sysfs_in(1);
  sysfs_in(2);
  sysfs_in(3);
  sysfs_in(4);
  sysfs_in(5);
  sysfs_in(6);

  /* 3 Fans */

  static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	int nr = to_sensor_dev_attr(attr)->index;

  	struct asb100_data *data = asb100_update_device(dev);
  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan[nr],
  		DIV_FROM_REG(data->fan_div[nr])));
  }

  static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	int nr = to_sensor_dev_attr(attr)->index;

  	struct asb100_data *data = asb100_update_device(dev);
  	return sprintf(buf, "%d
  ", FAN_FROM_REG(data->fan_min[nr],
  		DIV_FROM_REG(data->fan_div[nr])));
  }

  static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	int nr = to_sensor_dev_attr(attr)->index;

  	struct asb100_data *data = asb100_update_device(dev);
  	return sprintf(buf, "%d
  ", DIV_FROM_REG(data->fan_div[nr]));
  }

  static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	int nr = to_sensor_dev_attr(attr)->index;

  	struct i2c_client *client = to_i2c_client(dev);
  	struct asb100_data *data = i2c_get_clientdata(client);

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

  	mutex_lock(&data->update_lock);

  	data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
  	asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[nr]);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  /*
   * Note: we save and restore the fan minimum here, because its value is
   * determined in part by the fan 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 set_fan_div(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	int nr = to_sensor_dev_attr(attr)->index;

  	struct i2c_client *client = to_i2c_client(dev);
  	struct asb100_data *data = i2c_get_clientdata(client);
  	unsigned long min;

  	int reg;

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

  	mutex_lock(&data->update_lock);

  
  	min = FAN_FROM_REG(data->fan_min[nr],
  			DIV_FROM_REG(data->fan_div[nr]));
  	data->fan_div[nr] = DIV_TO_REG(val);

  	switch (nr) {

  	case 0:	/* fan 1 */
  		reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
  		reg = (reg & 0xcf) | (data->fan_div[0] << 4);
  		asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
  		break;
  
  	case 1:	/* fan 2 */
  		reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
  		reg = (reg & 0x3f) | (data->fan_div[1] << 6);
  		asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
  		break;
  
  	case 2:	/* fan 3 */
  		reg = asb100_read_value(client, ASB100_REG_PIN);
  		reg = (reg & 0x3f) | (data->fan_div[2] << 6);
  		asb100_write_value(client, ASB100_REG_PIN, reg);
  		break;
  	}
  
  	data->fan_min[nr] =
  		FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
  	asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[nr]);

  	mutex_unlock(&data->update_lock);

  
  	return count;
  }
  
  #define sysfs_fan(offset) \

  static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
  		show_fan, NULL, offset - 1); \
  static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
  		show_fan_min, set_fan_min, offset - 1); \
  static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
  		show_fan_div, set_fan_div, offset - 1)

  
  sysfs_fan(1);
  sysfs_fan(2);
  sysfs_fan(3);

  /* 4 Temp. Sensors */
  static int sprintf_temp_from_reg(u16 reg, char *buf, int nr)
  {
  	int ret = 0;
  
  	switch (nr) {
  	case 1: case 2:
  		ret = sprintf(buf, "%d
  ", LM75_TEMP_FROM_REG(reg));
  		break;
  	case 0: case 3: default:
  		ret = sprintf(buf, "%d
  ", TEMP_FROM_REG(reg));
  		break;
  	}
  	return ret;
  }

  #define show_temp_reg(reg) \

  static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
  		char *buf) \

  { \

  	int nr = to_sensor_dev_attr(attr)->index; \

  	struct asb100_data *data = asb100_update_device(dev); \
  	return sprintf_temp_from_reg(data->reg[nr], buf, nr); \
  }
  
  show_temp_reg(temp);
  show_temp_reg(temp_max);
  show_temp_reg(temp_hyst);
  
  #define set_temp_reg(REG, reg) \

  static ssize_t set_##reg(struct device *dev, struct device_attribute *attr, \
  		const char *buf, size_t count) \

  { \

  	int nr = to_sensor_dev_attr(attr)->index; \

  	struct i2c_client *client = to_i2c_client(dev); \
  	struct asb100_data *data = i2c_get_clientdata(client); \

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

  	mutex_lock(&data->update_lock); \

  	switch (nr) { \
  	case 1: case 2: \
  		data->reg[nr] = LM75_TEMP_TO_REG(val); \
  		break; \
  	case 0: case 3: default: \
  		data->reg[nr] = TEMP_TO_REG(val); \
  		break; \
  	} \
  	asb100_write_value(client, ASB100_REG_TEMP_##REG(nr+1), \
  			data->reg[nr]); \

  	mutex_unlock(&data->update_lock); \

  	return count; \
  }
  
  set_temp_reg(MAX, temp_max);
  set_temp_reg(HYST, temp_hyst);
  
  #define sysfs_temp(num) \

  static SENSOR_DEVICE_ATTR(temp##num##_input, S_IRUGO, \
  		show_temp, NULL, num - 1); \
  static SENSOR_DEVICE_ATTR(temp##num##_max, S_IRUGO | S_IWUSR, \
  		show_temp_max, set_temp_max, num - 1); \
  static SENSOR_DEVICE_ATTR(temp##num##_max_hyst, S_IRUGO | S_IWUSR, \
  		show_temp_hyst, set_temp_hyst, num - 1)

  
  sysfs_temp(1);
  sysfs_temp(2);
  sysfs_temp(3);
  sysfs_temp(4);
  
  /* VID */

  static ssize_t show_vid(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {
  	struct asb100_data *data = asb100_update_device(dev);
  	return sprintf(buf, "%d
  ", vid_from_reg(data->vid, data->vrm));
  }
  
  static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL);

  
  /* VRM */

  static ssize_t show_vrm(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {

  	struct asb100_data *data = dev_get_drvdata(dev);

  	return sprintf(buf, "%d
  ", data->vrm);
  }

  static ssize_t set_vrm(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {

  	struct asb100_data *data = dev_get_drvdata(dev);

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

  
  	if (val > 255)
  		return -EINVAL;

  	data->vrm = val;

  	return count;
  }
  
  /* Alarms */
  static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm);

  static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {
  	struct asb100_data *data = asb100_update_device(dev);

  	return sprintf(buf, "%u
  ", data->alarms);

  }
  
  static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);

  static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
  		char *buf)
  {
  	int bitnr = to_sensor_dev_attr(attr)->index;
  	struct asb100_data *data = asb100_update_device(dev);
  	return sprintf(buf, "%u
  ", (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(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_alarm, NULL, 13);

  /* 1 PWM */

  static ssize_t show_pwm1(struct device *dev, struct device_attribute *attr,
  		char *buf)

  {
  	struct asb100_data *data = asb100_update_device(dev);
  	return sprintf(buf, "%d
  ", ASB100_PWM_FROM_REG(data->pwm & 0x0f));
  }

  static ssize_t set_pwm1(struct device *dev, struct device_attribute *attr,
  		const char *buf, size_t count)

  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct asb100_data *data = i2c_get_clientdata(client);

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

  	mutex_lock(&data->update_lock);

  	data->pwm &= 0x80; /* keep the enable bit */
  	data->pwm |= (0x0f & ASB100_PWM_TO_REG(val));
  	asb100_write_value(client, ASB100_REG_PWM1, data->pwm);

  	mutex_unlock(&data->update_lock);

  	return count;
  }

  static ssize_t show_pwm_enable1(struct device *dev,
  		struct device_attribute *attr, char *buf)

  {
  	struct asb100_data *data = asb100_update_device(dev);
  	return sprintf(buf, "%d
  ", (data->pwm & 0x80) ? 1 : 0);
  }

  static ssize_t set_pwm_enable1(struct device *dev,
  		struct device_attribute *attr, const char *buf, size_t count)

  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct asb100_data *data = i2c_get_clientdata(client);

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

  	mutex_lock(&data->update_lock);

  	data->pwm &= 0x0f; /* keep the duty cycle bits */
  	data->pwm |= (val ? 0x80 : 0x00);
  	asb100_write_value(client, ASB100_REG_PWM1, data->pwm);

  	mutex_unlock(&data->update_lock);

  	return count;
  }
  
  static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm1, set_pwm1);
  static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
  		show_pwm_enable1, set_pwm_enable1);

  
  static struct attribute *asb100_attributes[] = {

  	&sensor_dev_attr_in0_input.dev_attr.attr,
  	&sensor_dev_attr_in0_min.dev_attr.attr,
  	&sensor_dev_attr_in0_max.dev_attr.attr,
  	&sensor_dev_attr_in1_input.dev_attr.attr,
  	&sensor_dev_attr_in1_min.dev_attr.attr,
  	&sensor_dev_attr_in1_max.dev_attr.attr,
  	&sensor_dev_attr_in2_input.dev_attr.attr,
  	&sensor_dev_attr_in2_min.dev_attr.attr,
  	&sensor_dev_attr_in2_max.dev_attr.attr,
  	&sensor_dev_attr_in3_input.dev_attr.attr,
  	&sensor_dev_attr_in3_min.dev_attr.attr,
  	&sensor_dev_attr_in3_max.dev_attr.attr,
  	&sensor_dev_attr_in4_input.dev_attr.attr,
  	&sensor_dev_attr_in4_min.dev_attr.attr,
  	&sensor_dev_attr_in4_max.dev_attr.attr,
  	&sensor_dev_attr_in5_input.dev_attr.attr,
  	&sensor_dev_attr_in5_min.dev_attr.attr,
  	&sensor_dev_attr_in5_max.dev_attr.attr,
  	&sensor_dev_attr_in6_input.dev_attr.attr,
  	&sensor_dev_attr_in6_min.dev_attr.attr,
  	&sensor_dev_attr_in6_max.dev_attr.attr,
  
  	&sensor_dev_attr_fan1_input.dev_attr.attr,
  	&sensor_dev_attr_fan1_min.dev_attr.attr,
  	&sensor_dev_attr_fan1_div.dev_attr.attr,
  	&sensor_dev_attr_fan2_input.dev_attr.attr,
  	&sensor_dev_attr_fan2_min.dev_attr.attr,
  	&sensor_dev_attr_fan2_div.dev_attr.attr,
  	&sensor_dev_attr_fan3_input.dev_attr.attr,
  	&sensor_dev_attr_fan3_min.dev_attr.attr,
  	&sensor_dev_attr_fan3_div.dev_attr.attr,
  
  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_temp1_max.dev_attr.attr,
  	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
  	&sensor_dev_attr_temp2_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_max.dev_attr.attr,
  	&sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
  	&sensor_dev_attr_temp3_input.dev_attr.attr,
  	&sensor_dev_attr_temp3_max.dev_attr.attr,
  	&sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
  	&sensor_dev_attr_temp4_input.dev_attr.attr,
  	&sensor_dev_attr_temp4_max.dev_attr.attr,
  	&sensor_dev_attr_temp4_max_hyst.dev_attr.attr,

  	&sensor_dev_attr_in0_alarm.dev_attr.attr,
  	&sensor_dev_attr_in1_alarm.dev_attr.attr,
  	&sensor_dev_attr_in2_alarm.dev_attr.attr,
  	&sensor_dev_attr_in3_alarm.dev_attr.attr,
  	&sensor_dev_attr_in4_alarm.dev_attr.attr,
  	&sensor_dev_attr_fan1_alarm.dev_attr.attr,
  	&sensor_dev_attr_fan2_alarm.dev_attr.attr,
  	&sensor_dev_attr_fan3_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp1_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp3_alarm.dev_attr.attr,

  	&dev_attr_cpu0_vid.attr,
  	&dev_attr_vrm.attr,
  	&dev_attr_alarms.attr,
  	&dev_attr_pwm1.attr,
  	&dev_attr_pwm1_enable.attr,
  
  	NULL
  };
  
  static const struct attribute_group asb100_group = {
  	.attrs = asb100_attributes,
  };

  static int asb100_detect_subclients(struct i2c_client *client)

  {
  	int i, id, err;

  	int address = client->addr;
  	unsigned short sc_addr[2];

  	struct asb100_data *data = i2c_get_clientdata(client);

  	struct i2c_adapter *adapter = client->adapter;

  
  	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(&client->dev,
  					"invalid subclient address %d; must be 0x48-0x4f
  ",

  					force_subclients[i]);
  				err = -ENODEV;
  				goto ERROR_SC_2;
  			}
  		}

  		asb100_write_value(client, ASB100_REG_I2C_SUBADDR,

  					(force_subclients[2] & 0x07) |

  					((force_subclients[3] & 0x07) << 4));

  		sc_addr[0] = force_subclients[2];
  		sc_addr[1] = force_subclients[3];

  	} else {

  		int val = asb100_read_value(client, ASB100_REG_I2C_SUBADDR);

  		sc_addr[0] = 0x48 + (val & 0x07);
  		sc_addr[1] = 0x48 + ((val >> 4) & 0x07);

  	}

  	if (sc_addr[0] == sc_addr[1]) {

  		dev_err(&client->dev,
  			"duplicate addresses 0x%x for subclients
  ",
  			sc_addr[0]);

  		err = -ENODEV;
  		goto ERROR_SC_2;
  	}

  	data->lm75[0] = i2c_new_dummy(adapter, sc_addr[0]);
  	if (!data->lm75[0]) {

  		dev_err(&client->dev,
  			"subclient %d registration at address 0x%x failed.
  ",
  			1, sc_addr[0]);

  		err = -ENOMEM;

  		goto ERROR_SC_2;
  	}

  	data->lm75[1] = i2c_new_dummy(adapter, sc_addr[1]);
  	if (!data->lm75[1]) {

  		dev_err(&client->dev,
  			"subclient %d registration at address 0x%x failed.
  ",
  			2, sc_addr[1]);

  		err = -ENOMEM;

  		goto ERROR_SC_3;
  	}
  
  	return 0;
  
  /* Undo inits in case of errors */
  ERROR_SC_3:

  	i2c_unregister_device(data->lm75[0]);

  ERROR_SC_2:

  	return err;
  }

  /* Return 0 if detection is successful, -ENODEV otherwise */

  static int asb100_detect(struct i2c_client *client,

  			 struct i2c_board_info *info)

  {

  	struct i2c_adapter *adapter = client->adapter;

  	int val1, val2;

  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {

  		pr_debug("detect failed, smbus byte data not supported!
  ");

  		return -ENODEV;

  	}

  	val1 = i2c_smbus_read_byte_data(client, ASB100_REG_BANK);
  	val2 = i2c_smbus_read_byte_data(client, ASB100_REG_CHIPMAN);

  	/* If we're in bank 0 */
  	if ((!(val1 & 0x07)) &&
  			/* Check for ASB100 ID (low byte) */
  			(((!(val1 & 0x80)) && (val2 != 0x94)) ||
  			/* Check for ASB100 ID (high byte ) */
  			((val1 & 0x80) && (val2 != 0x06)))) {

  		pr_debug("detect failed, bad chip id 0x%02x!
  ", val2);

  		return -ENODEV;
  	}

  	/* Put it now into bank 0 and Vendor ID High Byte */

  	i2c_smbus_write_byte_data(client, ASB100_REG_BANK,
  		(i2c_smbus_read_byte_data(client, ASB100_REG_BANK) & 0x78)
  		| 0x80);

  
  	/* Determine the chip type. */

  	val1 = i2c_smbus_read_byte_data(client, ASB100_REG_WCHIPID);
  	val2 = i2c_smbus_read_byte_data(client, ASB100_REG_CHIPMAN);
  
  	if (val1 != 0x31 || val2 != 0x06)
  		return -ENODEV;

  	strlcpy(info->type, "asb100", I2C_NAME_SIZE);

  	return 0;
  }
  
  static int asb100_probe(struct i2c_client *client,
  			const struct i2c_device_id *id)
  {
  	int err;
  	struct asb100_data *data;

  	data = devm_kzalloc(&client->dev, sizeof(struct asb100_data),
  			    GFP_KERNEL);
  	if (!data)
  		return -ENOMEM;

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

  
  	/* Attach secondary lm75 clients */

  	err = asb100_detect_subclients(client);
  	if (err)

  		return err;

  
  	/* Initialize the chip */

  	asb100_init_client(client);

  
  	/* A few vars need to be filled upon startup */

  	data->fan_min[0] = asb100_read_value(client, ASB100_REG_FAN_MIN(0));
  	data->fan_min[1] = asb100_read_value(client, ASB100_REG_FAN_MIN(1));
  	data->fan_min[2] = asb100_read_value(client, ASB100_REG_FAN_MIN(2));

  
  	/* Register sysfs hooks */

  	err = sysfs_create_group(&client->dev.kobj, &asb100_group);
  	if (err)

  		goto ERROR3;

  	data->hwmon_dev = hwmon_device_register(&client->dev);

  	if (IS_ERR(data->hwmon_dev)) {
  		err = PTR_ERR(data->hwmon_dev);

  		goto ERROR4;

  	}

  	return 0;

  ERROR4:

  	sysfs_remove_group(&client->dev.kobj, &asb100_group);

  ERROR3:

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

  	return err;
  }

  static int asb100_remove(struct i2c_client *client)

  {

  	struct asb100_data *data = i2c_get_clientdata(client);

  	hwmon_device_unregister(data->hwmon_dev);
  	sysfs_remove_group(&client->dev.kobj, &asb100_group);

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

  	return 0;
  }

  /*
   * The SMBus locks itself, usually, but nothing may access the chip between
   * bank switches.
   */

  static int asb100_read_value(struct i2c_client *client, u16 reg)
  {
  	struct asb100_data *data = i2c_get_clientdata(client);
  	struct i2c_client *cl;
  	int res, bank;

  	mutex_lock(&data->lock);

  
  	bank = (reg >> 8) & 0x0f;
  	if (bank > 2)
  		/* switch banks */
  		i2c_smbus_write_byte_data(client, ASB100_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 = i2c_smbus_read_word_swapped(cl, 0);

  			break;
  		case 0x52: /* CONFIG */
  			res = i2c_smbus_read_byte_data(cl, 1);
  			break;
  		case 0x53: /* HYST */

  			res = i2c_smbus_read_word_swapped(cl, 2);

  			break;
  		case 0x55: /* MAX */
  		default:

  			res = i2c_smbus_read_word_swapped(cl, 3);

  			break;
  		}
  	}
  
  	if (bank > 2)
  		i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);

  	mutex_unlock(&data->lock);

  
  	return res;
  }
  
  static void asb100_write_value(struct i2c_client *client, u16 reg, u16 value)
  {
  	struct asb100_data *data = i2c_get_clientdata(client);
  	struct i2c_client *cl;
  	int bank;

  	mutex_lock(&data->lock);

  
  	bank = (reg >> 8) & 0x0f;
  	if (bank > 2)
  		/* switch banks */
  		i2c_smbus_write_byte_data(client, ASB100_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_swapped(cl, 2, value);

  			break;
  		case 0x55: /* MAX */

  			i2c_smbus_write_word_swapped(cl, 3, value);

  			break;
  		}
  	}
  
  	if (bank > 2)
  		i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);

  	mutex_unlock(&data->lock);

  }
  
  static void asb100_init_client(struct i2c_client *client)
  {
  	struct asb100_data *data = i2c_get_clientdata(client);

  	data->vrm = vid_which_vrm();

  
  	/* Start monitoring */

  	asb100_write_value(client, ASB100_REG_CONFIG,

  		(asb100_read_value(client, ASB100_REG_CONFIG) & 0xf7) | 0x01);
  }
  
  static struct asb100_data *asb100_update_device(struct device *dev)
  {
  	struct i2c_client *client = to_i2c_client(dev);
  	struct asb100_data *data = i2c_get_clientdata(client);
  	int i;

  	mutex_lock(&data->update_lock);

  
  	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
  		|| !data->valid) {
  
  		dev_dbg(&client->dev, "starting device update...
  ");
  
  		/* 7 voltage inputs */
  		for (i = 0; i < 7; i++) {
  			data->in[i] = asb100_read_value(client,
  				ASB100_REG_IN(i));
  			data->in_min[i] = asb100_read_value(client,
  				ASB100_REG_IN_MIN(i));
  			data->in_max[i] = asb100_read_value(client,
  				ASB100_REG_IN_MAX(i));
  		}
  
  		/* 3 fan inputs */
  		for (i = 0; i < 3; i++) {
  			data->fan[i] = asb100_read_value(client,
  					ASB100_REG_FAN(i));
  			data->fan_min[i] = asb100_read_value(client,
  					ASB100_REG_FAN_MIN(i));
  		}
  
  		/* 4 temperature inputs */
  		for (i = 1; i <= 4; i++) {
  			data->temp[i-1] = asb100_read_value(client,
  					ASB100_REG_TEMP(i));
  			data->temp_max[i-1] = asb100_read_value(client,
  					ASB100_REG_TEMP_MAX(i));
  			data->temp_hyst[i-1] = asb100_read_value(client,
  					ASB100_REG_TEMP_HYST(i));
  		}
  
  		/* VID and fan divisors */
  		i = asb100_read_value(client, ASB100_REG_VID_FANDIV);
  		data->vid = i & 0x0f;
  		data->vid |= (asb100_read_value(client,
  				ASB100_REG_CHIPID) & 0x01) << 4;
  		data->fan_div[0] = (i >> 4) & 0x03;
  		data->fan_div[1] = (i >> 6) & 0x03;
  		data->fan_div[2] = (asb100_read_value(client,
  				ASB100_REG_PIN) >> 6) & 0x03;
  
  		/* PWM */
  		data->pwm = asb100_read_value(client, ASB100_REG_PWM1);
  
  		/* alarms */
  		data->alarms = asb100_read_value(client, ASB100_REG_ALARM1) +
  			(asb100_read_value(client, ASB100_REG_ALARM2) << 8);
  
  		data->last_updated = jiffies;
  		data->valid = 1;
  
  		dev_dbg(&client->dev, "... device update complete
  ");
  	}

  	mutex_unlock(&data->update_lock);

  
  	return data;
  }

  module_i2c_driver(asb100_driver);

  
  MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
  MODULE_DESCRIPTION("ASB100 Bach driver");
  MODULE_LICENSE("GPL");