// SPDX-License-Identifier: GPL-2.0-or-later

  /*

   * emc2103.c - Support for SMSC EMC2103
   * Copyright (c) 2010 SMSC

   */

  
  #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-sysfs.h>
  #include <linux/err.h>
  #include <linux/mutex.h>
  
  /* Addresses scanned */
  static const unsigned short normal_i2c[] = { 0x2E, I2C_CLIENT_END };
  
  static const u8 REG_TEMP[4] = { 0x00, 0x02, 0x04, 0x06 };
  static const u8 REG_TEMP_MIN[4] = { 0x3c, 0x38, 0x39, 0x3a };
  static const u8 REG_TEMP_MAX[4] = { 0x34, 0x30, 0x31, 0x32 };
  
  #define REG_CONF1		0x20
  #define REG_TEMP_MAX_ALARM	0x24
  #define REG_TEMP_MIN_ALARM	0x25
  #define REG_FAN_CONF1		0x42
  #define REG_FAN_TARGET_LO	0x4c
  #define REG_FAN_TARGET_HI	0x4d
  #define REG_FAN_TACH_HI		0x4e
  #define REG_FAN_TACH_LO		0x4f
  #define REG_PRODUCT_ID		0xfd
  #define REG_MFG_ID		0xfe
  
  /* equation 4 from datasheet: rpm = (3932160 * multipler) / count */
  #define FAN_RPM_FACTOR		3932160

  /*
   * 2103-2 and 2103-4's 3rd temperature sensor can be connected to two diodes

   * in anti-parallel mode, and in this configuration both can be read
   * independently (so we have 4 temperature inputs).  The device can't
   * detect if it's connected in this mode, so we have to manually enable
   * it.  Default is to leave the device in the state it's already in (-1).

   * This parameter allows APD mode to be optionally forced on or off
   */

  static int apd = -1;

  module_param(apd, bint, 0);

  MODULE_PARM_DESC(apd, "Set to zero to disable anti-parallel diode mode");

  
  struct temperature {
  	s8	degrees;
  	u8	fraction;	/* 0-7 multiples of 0.125 */
  };
  
  struct emc2103_data {

  	struct i2c_client	*client;
  	const struct		attribute_group *groups[4];

  	struct mutex		update_lock;
  	bool			valid;		/* registers are valid */
  	bool			fan_rpm_control;
  	int			temp_count;	/* num of temp sensors */
  	unsigned long		last_updated;	/* in jiffies */
  	struct temperature	temp[4];	/* internal + 3 external */
  	s8			temp_min[4];	/* no fractional part */
  	s8			temp_max[4];    /* no fractional part */
  	u8			temp_min_alarm;
  	u8			temp_max_alarm;
  	u8			fan_multiplier;
  	u16			fan_tach;
  	u16			fan_target;
  };
  
  static int read_u8_from_i2c(struct i2c_client *client, u8 i2c_reg, u8 *output)
  {
  	int status = i2c_smbus_read_byte_data(client, i2c_reg);
  	if (status < 0) {
  		dev_warn(&client->dev, "reg 0x%02x, err %d
  ",
  			i2c_reg, status);
  	} else {
  		*output = status;
  	}
  	return status;
  }
  
  static void read_temp_from_i2c(struct i2c_client *client, u8 i2c_reg,
  			       struct temperature *temp)
  {
  	u8 degrees, fractional;
  
  	if (read_u8_from_i2c(client, i2c_reg, &degrees) < 0)
  		return;
  
  	if (read_u8_from_i2c(client, i2c_reg + 1, &fractional) < 0)
  		return;
  
  	temp->degrees = degrees;
  	temp->fraction = (fractional & 0xe0) >> 5;
  }
  
  static void read_fan_from_i2c(struct i2c_client *client, u16 *output,
  			      u8 hi_addr, u8 lo_addr)
  {
  	u8 high_byte, lo_byte;
  
  	if (read_u8_from_i2c(client, hi_addr, &high_byte) < 0)
  		return;
  
  	if (read_u8_from_i2c(client, lo_addr, &lo_byte) < 0)
  		return;
  
  	*output = ((u16)high_byte << 5) | (lo_byte >> 3);
  }
  
  static void write_fan_target_to_i2c(struct i2c_client *client, u16 new_target)
  {
  	u8 high_byte = (new_target & 0x1fe0) >> 5;
  	u8 low_byte = (new_target & 0x001f) << 3;
  	i2c_smbus_write_byte_data(client, REG_FAN_TARGET_LO, low_byte);
  	i2c_smbus_write_byte_data(client, REG_FAN_TARGET_HI, high_byte);
  }
  
  static void read_fan_config_from_i2c(struct i2c_client *client)
  
  {
  	struct emc2103_data *data = i2c_get_clientdata(client);
  	u8 conf1;
  
  	if (read_u8_from_i2c(client, REG_FAN_CONF1, &conf1) < 0)
  		return;
  
  	data->fan_multiplier = 1 << ((conf1 & 0x60) >> 5);
  	data->fan_rpm_control = (conf1 & 0x80) != 0;
  }
  
  static struct emc2103_data *emc2103_update_device(struct device *dev)
  {

  	struct emc2103_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  
  	mutex_lock(&data->update_lock);
  
  	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
  	    || !data->valid) {
  		int i;
  
  		for (i = 0; i < data->temp_count; i++) {
  			read_temp_from_i2c(client, REG_TEMP[i], &data->temp[i]);
  			read_u8_from_i2c(client, REG_TEMP_MIN[i],
  				&data->temp_min[i]);
  			read_u8_from_i2c(client, REG_TEMP_MAX[i],
  				&data->temp_max[i]);
  		}
  
  		read_u8_from_i2c(client, REG_TEMP_MIN_ALARM,
  			&data->temp_min_alarm);
  		read_u8_from_i2c(client, REG_TEMP_MAX_ALARM,
  			&data->temp_max_alarm);
  
  		read_fan_from_i2c(client, &data->fan_tach,
  			REG_FAN_TACH_HI, REG_FAN_TACH_LO);
  		read_fan_from_i2c(client, &data->fan_target,
  			REG_FAN_TARGET_HI, REG_FAN_TARGET_LO);
  		read_fan_config_from_i2c(client);
  
  		data->last_updated = jiffies;
  		data->valid = true;
  	}
  
  	mutex_unlock(&data->update_lock);
  
  	return data;
  }
  
  static ssize_t

  temp_show(struct device *dev, struct device_attribute *da, char *buf)

  {
  	int nr = to_sensor_dev_attr(da)->index;
  	struct emc2103_data *data = emc2103_update_device(dev);
  	int millidegrees = data->temp[nr].degrees * 1000
  		+ data->temp[nr].fraction * 125;
  	return sprintf(buf, "%d
  ", millidegrees);
  }
  
  static ssize_t

  temp_min_show(struct device *dev, struct device_attribute *da, char *buf)

  {
  	int nr = to_sensor_dev_attr(da)->index;
  	struct emc2103_data *data = emc2103_update_device(dev);
  	int millidegrees = data->temp_min[nr] * 1000;
  	return sprintf(buf, "%d
  ", millidegrees);
  }
  
  static ssize_t

  temp_max_show(struct device *dev, struct device_attribute *da, char *buf)

  {
  	int nr = to_sensor_dev_attr(da)->index;
  	struct emc2103_data *data = emc2103_update_device(dev);
  	int millidegrees = data->temp_max[nr] * 1000;
  	return sprintf(buf, "%d
  ", millidegrees);
  }
  
  static ssize_t

  temp_fault_show(struct device *dev, struct device_attribute *da, char *buf)

  {
  	int nr = to_sensor_dev_attr(da)->index;
  	struct emc2103_data *data = emc2103_update_device(dev);
  	bool fault = (data->temp[nr].degrees == -128);
  	return sprintf(buf, "%d
  ", fault ? 1 : 0);
  }
  
  static ssize_t

  temp_min_alarm_show(struct device *dev, struct device_attribute *da,
  		    char *buf)

  {
  	int nr = to_sensor_dev_attr(da)->index;
  	struct emc2103_data *data = emc2103_update_device(dev);
  	bool alarm = data->temp_min_alarm & (1 << nr);
  	return sprintf(buf, "%d
  ", alarm ? 1 : 0);
  }
  
  static ssize_t

  temp_max_alarm_show(struct device *dev, struct device_attribute *da,
  		    char *buf)

  {
  	int nr = to_sensor_dev_attr(da)->index;
  	struct emc2103_data *data = emc2103_update_device(dev);
  	bool alarm = data->temp_max_alarm & (1 << nr);
  	return sprintf(buf, "%d
  ", alarm ? 1 : 0);
  }

  static ssize_t temp_min_store(struct device *dev, struct device_attribute *da,
  			      const char *buf, size_t count)

  {
  	int nr = to_sensor_dev_attr(da)->index;

  	struct emc2103_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  	long val;

  	int result = kstrtol(buf, 10, &val);

  	if (result < 0)

  		return result;

  	val = DIV_ROUND_CLOSEST(clamp_val(val, -63000, 127000), 1000);

  
  	mutex_lock(&data->update_lock);
  	data->temp_min[nr] = val;
  	i2c_smbus_write_byte_data(client, REG_TEMP_MIN[nr], val);
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }

  static ssize_t temp_max_store(struct device *dev, struct device_attribute *da,
  			      const char *buf, size_t count)

  {
  	int nr = to_sensor_dev_attr(da)->index;

  	struct emc2103_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  	long val;

  	int result = kstrtol(buf, 10, &val);

  	if (result < 0)

  		return result;

  	val = DIV_ROUND_CLOSEST(clamp_val(val, -63000, 127000), 1000);

  
  	mutex_lock(&data->update_lock);
  	data->temp_max[nr] = val;
  	i2c_smbus_write_byte_data(client, REG_TEMP_MAX[nr], val);
  	mutex_unlock(&data->update_lock);
  
  	return count;
  }
  
  static ssize_t

  fan1_input_show(struct device *dev, struct device_attribute *da, char *buf)

  {
  	struct emc2103_data *data = emc2103_update_device(dev);
  	int rpm = 0;
  	if (data->fan_tach != 0)
  		rpm = (FAN_RPM_FACTOR * data->fan_multiplier) / data->fan_tach;
  	return sprintf(buf, "%d
  ", rpm);
  }
  
  static ssize_t

  fan1_div_show(struct device *dev, struct device_attribute *da, char *buf)

  {
  	struct emc2103_data *data = emc2103_update_device(dev);
  	int fan_div = 8 / data->fan_multiplier;
  	return sprintf(buf, "%d
  ", fan_div);
  }

  /*
   * Note: we also update the fan target here, because its value is
   * determined in part by the fan clock divider.  This follows the principle
   * of least surprise; the user doesn't expect the fan target to change just
   * because the divider changed.
   */

  static ssize_t fan1_div_store(struct device *dev, struct device_attribute *da,
  			      const char *buf, size_t count)

  {
  	struct emc2103_data *data = emc2103_update_device(dev);

  	struct i2c_client *client = data->client;

  	int new_range_bits, old_div = 8 / data->fan_multiplier;
  	long new_div;

  	int status = kstrtol(buf, 10, &new_div);

  	if (status < 0)

  		return status;

  
  	if (new_div == old_div) /* No change */
  		return count;
  
  	switch (new_div) {
  	case 1:
  		new_range_bits = 3;
  		break;
  	case 2:
  		new_range_bits = 2;
  		break;
  	case 4:
  		new_range_bits = 1;
  		break;
  	case 8:
  		new_range_bits = 0;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	mutex_lock(&data->update_lock);
  
  	status = i2c_smbus_read_byte_data(client, REG_FAN_CONF1);
  	if (status < 0) {
  		dev_dbg(&client->dev, "reg 0x%02x, err %d
  ",
  			REG_FAN_CONF1, status);
  		mutex_unlock(&data->update_lock);

  		return status;

  	}
  	status &= 0x9F;
  	status |= (new_range_bits << 5);
  	i2c_smbus_write_byte_data(client, REG_FAN_CONF1, status);
  
  	data->fan_multiplier = 8 / new_div;
  
  	/* update fan target if high byte is not disabled */
  	if ((data->fan_target & 0x1fe0) != 0x1fe0) {
  		u16 new_target = (data->fan_target * old_div) / new_div;
  		data->fan_target = min(new_target, (u16)0x1fff);
  		write_fan_target_to_i2c(client, data->fan_target);
  	}
  
  	/* invalidate data to force re-read from hardware */
  	data->valid = false;
  
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  static ssize_t

  fan1_target_show(struct device *dev, struct device_attribute *da, char *buf)

  {
  	struct emc2103_data *data = emc2103_update_device(dev);
  	int rpm = 0;
  
  	/* high byte of 0xff indicates disabled so return 0 */
  	if ((data->fan_target != 0) && ((data->fan_target & 0x1fe0) != 0x1fe0))
  		rpm = (FAN_RPM_FACTOR * data->fan_multiplier)
  			/ data->fan_target;
  
  	return sprintf(buf, "%d
  ", rpm);
  }

  static ssize_t fan1_target_store(struct device *dev,
  				 struct device_attribute *da, const char *buf,
  				 size_t count)

  {
  	struct emc2103_data *data = emc2103_update_device(dev);

  	struct i2c_client *client = data->client;

  	unsigned long rpm_target;

  	int result = kstrtoul(buf, 10, &rpm_target);

  	if (result < 0)

  		return result;

  
  	/* Datasheet states 16384 as maximum RPM target (table 3.2) */

  	rpm_target = clamp_val(rpm_target, 0, 16384);

  
  	mutex_lock(&data->update_lock);
  
  	if (rpm_target == 0)
  		data->fan_target = 0x1fff;
  	else

  		data->fan_target = clamp_val(

  			(FAN_RPM_FACTOR * data->fan_multiplier) / rpm_target,
  			0, 0x1fff);
  
  	write_fan_target_to_i2c(client, data->fan_target);
  
  	mutex_unlock(&data->update_lock);
  	return count;
  }
  
  static ssize_t

  fan1_fault_show(struct device *dev, struct device_attribute *da, char *buf)

  {
  	struct emc2103_data *data = emc2103_update_device(dev);
  	bool fault = ((data->fan_tach & 0x1fe0) == 0x1fe0);
  	return sprintf(buf, "%d
  ", fault ? 1 : 0);
  }
  
  static ssize_t

  pwm1_enable_show(struct device *dev, struct device_attribute *da, char *buf)

  {
  	struct emc2103_data *data = emc2103_update_device(dev);
  	return sprintf(buf, "%d
  ", data->fan_rpm_control ? 3 : 0);
  }

  static ssize_t pwm1_enable_store(struct device *dev,
  				 struct device_attribute *da, const char *buf,
  				 size_t count)

  {

  	struct emc2103_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  	long new_value;
  	u8 conf_reg;

  	int result = kstrtol(buf, 10, &new_value);

  	if (result < 0)

  		return result;

  
  	mutex_lock(&data->update_lock);
  	switch (new_value) {
  	case 0:
  		data->fan_rpm_control = false;
  		break;
  	case 3:
  		data->fan_rpm_control = true;
  		break;
  	default:

  		count = -EINVAL;
  		goto err;

  	}

  	result = read_u8_from_i2c(client, REG_FAN_CONF1, &conf_reg);

  	if (result < 0) {

  		count = result;
  		goto err;
  	}

  
  	if (data->fan_rpm_control)
  		conf_reg |= 0x80;
  	else
  		conf_reg &= ~0x80;
  
  	i2c_smbus_write_byte_data(client, REG_FAN_CONF1, conf_reg);

  err:

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

  static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
  static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0);
  static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0);
  static SENSOR_DEVICE_ATTR_RO(temp1_fault, temp_fault, 0);
  static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, temp_min_alarm, 0);
  static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, temp_max_alarm, 0);
  
  static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
  static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1);
  static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1);
  static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp_fault, 1);
  static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, temp_min_alarm, 1);
  static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, temp_max_alarm, 1);
  
  static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
  static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2);
  static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2);
  static SENSOR_DEVICE_ATTR_RO(temp3_fault, temp_fault, 2);
  static SENSOR_DEVICE_ATTR_RO(temp3_min_alarm, temp_min_alarm, 2);
  static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, temp_max_alarm, 2);
  
  static SENSOR_DEVICE_ATTR_RO(temp4_input, temp, 3);
  static SENSOR_DEVICE_ATTR_RW(temp4_min, temp_min, 3);
  static SENSOR_DEVICE_ATTR_RW(temp4_max, temp_max, 3);
  static SENSOR_DEVICE_ATTR_RO(temp4_fault, temp_fault, 3);
  static SENSOR_DEVICE_ATTR_RO(temp4_min_alarm, temp_min_alarm, 3);
  static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, temp_max_alarm, 3);

  static DEVICE_ATTR_RO(fan1_input);
  static DEVICE_ATTR_RW(fan1_div);
  static DEVICE_ATTR_RW(fan1_target);
  static DEVICE_ATTR_RO(fan1_fault);

  static DEVICE_ATTR_RW(pwm1_enable);

  
  /* sensors present on all models */
  static struct attribute *emc2103_attributes[] = {
  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_temp1_min.dev_attr.attr,
  	&sensor_dev_attr_temp1_max.dev_attr.attr,
  	&sensor_dev_attr_temp1_fault.dev_attr.attr,
  	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_min.dev_attr.attr,
  	&sensor_dev_attr_temp2_max.dev_attr.attr,
  	&sensor_dev_attr_temp2_fault.dev_attr.attr,
  	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
  	&dev_attr_fan1_input.attr,
  	&dev_attr_fan1_div.attr,
  	&dev_attr_fan1_target.attr,
  	&dev_attr_fan1_fault.attr,
  	&dev_attr_pwm1_enable.attr,
  	NULL
  };
  
  /* extra temperature sensors only present on 2103-2 and 2103-4 */
  static struct attribute *emc2103_attributes_temp3[] = {
  	&sensor_dev_attr_temp3_input.dev_attr.attr,
  	&sensor_dev_attr_temp3_min.dev_attr.attr,
  	&sensor_dev_attr_temp3_max.dev_attr.attr,
  	&sensor_dev_attr_temp3_fault.dev_attr.attr,
  	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
  	NULL
  };
  
  /* extra temperature sensors only present on 2103-2 and 2103-4 in APD mode */
  static struct attribute *emc2103_attributes_temp4[] = {
  	&sensor_dev_attr_temp4_input.dev_attr.attr,
  	&sensor_dev_attr_temp4_min.dev_attr.attr,
  	&sensor_dev_attr_temp4_max.dev_attr.attr,
  	&sensor_dev_attr_temp4_fault.dev_attr.attr,
  	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
  	NULL
  };
  
  static const struct attribute_group emc2103_group = {
  	.attrs = emc2103_attributes,
  };
  
  static const struct attribute_group emc2103_temp3_group = {
  	.attrs = emc2103_attributes_temp3,
  };
  
  static const struct attribute_group emc2103_temp4_group = {
  	.attrs = emc2103_attributes_temp4,
  };
  
  static int

  emc2103_probe(struct i2c_client *client)

  {
  	struct emc2103_data *data;

  	struct device *hwmon_dev;
  	int status, idx = 0;

  
  	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  		return -EIO;

  	data = devm_kzalloc(&client->dev, sizeof(struct emc2103_data),
  			    GFP_KERNEL);

  	if (!data)
  		return -ENOMEM;
  
  	i2c_set_clientdata(client, data);

  	data->client = client;

  	mutex_init(&data->update_lock);
  
  	/* 2103-2 and 2103-4 have 3 external diodes, 2103-1 has 1 */
  	status = i2c_smbus_read_byte_data(client, REG_PRODUCT_ID);
  	if (status == 0x24) {
  		/* 2103-1 only has 1 external diode */
  		data->temp_count = 2;
  	} else {
  		/* 2103-2 and 2103-4 have 3 or 4 external diodes */
  		status = i2c_smbus_read_byte_data(client, REG_CONF1);
  		if (status < 0) {
  			dev_dbg(&client->dev, "reg 0x%02x, err %d
  ", REG_CONF1,
  				status);

  			return status;

  		}
  
  		/* detect current state of hardware */
  		data->temp_count = (status & 0x01) ? 4 : 3;
  
  		/* force APD state if module parameter is set */
  		if (apd == 0) {
  			/* force APD mode off */
  			data->temp_count = 3;
  			status &= ~(0x01);
  			i2c_smbus_write_byte_data(client, REG_CONF1, status);
  		} else if (apd == 1) {
  			/* force APD mode on */
  			data->temp_count = 4;
  			status |= 0x01;
  			i2c_smbus_write_byte_data(client, REG_CONF1, status);
  		}
  	}

  	/* sysfs hooks */
  	data->groups[idx++] = &emc2103_group;

  	if (data->temp_count >= 3)

  		data->groups[idx++] = &emc2103_temp3_group;

  	if (data->temp_count == 4)

  		data->groups[idx++] = &emc2103_temp4_group;

  	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
  							   client->name, data,
  							   data->groups);
  	if (IS_ERR(hwmon_dev))
  		return PTR_ERR(hwmon_dev);

  	dev_info(&client->dev, "%s: sensor '%s'
  ",
  		 dev_name(hwmon_dev), client->name);

  	return 0;
  }
  
  static const struct i2c_device_id emc2103_ids[] = {
  	{ "emc2103", 0, },
  	{ /* LIST END */ }
  };
  MODULE_DEVICE_TABLE(i2c, emc2103_ids);
  
  /* Return 0 if detection is successful, -ENODEV otherwise */
  static int
  emc2103_detect(struct i2c_client *new_client, struct i2c_board_info *info)
  {
  	struct i2c_adapter *adapter = new_client->adapter;
  	int manufacturer, product;
  
  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  		return -ENODEV;
  
  	manufacturer = i2c_smbus_read_byte_data(new_client, REG_MFG_ID);
  	if (manufacturer != 0x5D)
  		return -ENODEV;
  
  	product = i2c_smbus_read_byte_data(new_client, REG_PRODUCT_ID);
  	if ((product != 0x24) && (product != 0x26))
  		return -ENODEV;
  
  	strlcpy(info->type, "emc2103", I2C_NAME_SIZE);
  
  	return 0;
  }
  
  static struct i2c_driver emc2103_driver = {
  	.class		= I2C_CLASS_HWMON,
  	.driver = {
  		.name	= "emc2103",
  	},

  	.probe_new	= emc2103_probe,

  	.id_table	= emc2103_ids,
  	.detect		= emc2103_detect,
  	.address_list	= normal_i2c,
  };

  module_i2c_driver(emc2103_driver);

  MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");

  MODULE_DESCRIPTION("SMSC EMC2103 hwmon driver");
  MODULE_LICENSE("GPL");