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

  /*
   * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
   *
   * based on max1668.c
   * Copyright (c) 2011 David George <david.george@ska.ac.za>

   */
  
  #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>

  #include <linux/of_device.h>

  #include <linux/of.h>
  
  #include <linux/platform_data/max6697.h>
  
  enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694,
  	     max6697, max6698, max6699 };
  
  /* Report local sensor as temp1 */
  
  static const u8 MAX6697_REG_TEMP[] = {
  			0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 };
  static const u8 MAX6697_REG_TEMP_EXT[] = {
  			0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 };
  static const u8 MAX6697_REG_MAX[] = {
  			0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 };
  static const u8 MAX6697_REG_CRIT[] = {
  			0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 };
  
  /*
   * Map device tree / platform data register bit map to chip bit map.
   * Applies to alert register and over-temperature register.
   */

  #define MAX6697_ALERT_MAP_BITS(reg)	((((reg) & 0x7e) >> 1) | \

  				 (((reg) & 0x01) << 6) | ((reg) & 0x80))

  #define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7))

  
  #define MAX6697_REG_STAT(n)		(0x44 + (n))
  
  #define MAX6697_REG_CONFIG		0x41
  #define MAX6581_CONF_EXTENDED		(1 << 1)
  #define MAX6693_CONF_BETA		(1 << 2)
  #define MAX6697_CONF_RESISTANCE		(1 << 3)
  #define MAX6697_CONF_TIMEOUT		(1 << 5)
  #define MAX6697_REG_ALERT_MASK		0x42
  #define MAX6697_REG_OVERT_MASK		0x43
  
  #define MAX6581_REG_RESISTANCE		0x4a
  #define MAX6581_REG_IDEALITY		0x4b
  #define MAX6581_REG_IDEALITY_SELECT	0x4c
  #define MAX6581_REG_OFFSET		0x4d
  #define MAX6581_REG_OFFSET_SELECT	0x4e

  #define MAX6581_OFFSET_MIN		-31750
  #define MAX6581_OFFSET_MAX		31750

  
  #define MAX6697_CONV_TIME		156	/* ms per channel, worst case */
  
  struct max6697_chip_data {
  	int channels;
  	u32 have_ext;
  	u32 have_crit;
  	u32 have_fault;
  	u8 valid_conf;
  	const u8 *alarm_map;
  };
  
  struct max6697_data {

  	struct i2c_client *client;

  
  	enum chips type;
  	const struct max6697_chip_data *chip;
  
  	int update_interval;	/* in milli-seconds */
  	int temp_offset;	/* in degrees C */
  
  	struct mutex update_lock;
  	unsigned long last_updated;	/* In jiffies */
  	bool valid;		/* true if following fields are valid */
  
  	/* 1x local and up to 7x remote */
  	u8 temp[8][4];		/* [nr][0]=temp [1]=ext [2]=max [3]=crit */
  #define MAX6697_TEMP_INPUT	0
  #define MAX6697_TEMP_EXT	1
  #define MAX6697_TEMP_MAX	2
  #define MAX6697_TEMP_CRIT	3
  	u32 alarms;
  };
  
  /* Diode fault status bits on MAX6581 are right shifted by one bit */
  static const u8 max6581_alarm_map[] = {
  	 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15,
  	 16, 17, 18, 19, 20, 21, 22, 23 };
  
  static const struct max6697_chip_data max6697_chip_data[] = {
  	[max6581] = {
  		.channels = 8,
  		.have_crit = 0xff,
  		.have_ext = 0x7f,
  		.have_fault = 0xfe,
  		.valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT,
  		.alarm_map = max6581_alarm_map,
  	},
  	[max6602] = {
  		.channels = 5,
  		.have_crit = 0x12,
  		.have_ext = 0x02,
  		.have_fault = 0x1e,
  		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  	},
  	[max6622] = {
  		.channels = 5,
  		.have_crit = 0x12,
  		.have_ext = 0x02,
  		.have_fault = 0x1e,
  		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  	},
  	[max6636] = {
  		.channels = 7,
  		.have_crit = 0x72,
  		.have_ext = 0x02,
  		.have_fault = 0x7e,
  		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  	},
  	[max6689] = {
  		.channels = 7,
  		.have_crit = 0x72,
  		.have_ext = 0x02,
  		.have_fault = 0x7e,
  		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  	},
  	[max6693] = {
  		.channels = 7,
  		.have_crit = 0x72,
  		.have_ext = 0x02,
  		.have_fault = 0x7e,
  		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
  		  MAX6697_CONF_TIMEOUT,
  	},
  	[max6694] = {
  		.channels = 5,
  		.have_crit = 0x12,
  		.have_ext = 0x02,
  		.have_fault = 0x1e,
  		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA |
  		  MAX6697_CONF_TIMEOUT,
  	},
  	[max6697] = {
  		.channels = 7,
  		.have_crit = 0x72,
  		.have_ext = 0x02,
  		.have_fault = 0x7e,
  		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  	},
  	[max6698] = {
  		.channels = 7,
  		.have_crit = 0x72,
  		.have_ext = 0x02,
  		.have_fault = 0x0e,
  		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  	},
  	[max6699] = {
  		.channels = 5,
  		.have_crit = 0x12,
  		.have_ext = 0x02,
  		.have_fault = 0x1e,
  		.valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT,
  	},
  };

  static inline int max6581_offset_to_millic(int val)
  {
  	return sign_extend32(val, 7) * 250;
  }

  static struct max6697_data *max6697_update_device(struct device *dev)
  {

  	struct max6697_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  	struct max6697_data *ret = data;
  	int val;
  	int i;
  	u32 alarms;
  
  	mutex_lock(&data->update_lock);
  
  	if (data->valid &&
  	    !time_after(jiffies, data->last_updated
  			+ msecs_to_jiffies(data->update_interval)))
  		goto abort;
  
  	for (i = 0; i < data->chip->channels; i++) {
  		if (data->chip->have_ext & (1 << i)) {
  			val = i2c_smbus_read_byte_data(client,
  						       MAX6697_REG_TEMP_EXT[i]);
  			if (unlikely(val < 0)) {
  				ret = ERR_PTR(val);
  				goto abort;
  			}
  			data->temp[i][MAX6697_TEMP_EXT] = val;
  		}
  
  		val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]);
  		if (unlikely(val < 0)) {
  			ret = ERR_PTR(val);
  			goto abort;
  		}
  		data->temp[i][MAX6697_TEMP_INPUT] = val;
  
  		val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]);
  		if (unlikely(val < 0)) {
  			ret = ERR_PTR(val);
  			goto abort;
  		}
  		data->temp[i][MAX6697_TEMP_MAX] = val;
  
  		if (data->chip->have_crit & (1 << i)) {
  			val = i2c_smbus_read_byte_data(client,
  						       MAX6697_REG_CRIT[i]);
  			if (unlikely(val < 0)) {
  				ret = ERR_PTR(val);
  				goto abort;
  			}
  			data->temp[i][MAX6697_TEMP_CRIT] = val;
  		}
  	}
  
  	alarms = 0;
  	for (i = 0; i < 3; i++) {
  		val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i));
  		if (unlikely(val < 0)) {
  			ret = ERR_PTR(val);
  			goto abort;
  		}
  		alarms = (alarms << 8) | val;
  	}
  	data->alarms = alarms;
  	data->last_updated = jiffies;
  	data->valid = true;
  abort:
  	mutex_unlock(&data->update_lock);
  
  	return ret;
  }

  static ssize_t temp_input_show(struct device *dev,

  			       struct device_attribute *devattr, char *buf)
  {
  	int index = to_sensor_dev_attr(devattr)->index;
  	struct max6697_data *data = max6697_update_device(dev);
  	int temp;
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3;
  	temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5;
  
  	return sprintf(buf, "%d
  ", temp * 125);
  }

  static ssize_t temp_show(struct device *dev, struct device_attribute *devattr,
  			 char *buf)

  {
  	int nr = to_sensor_dev_attr_2(devattr)->nr;
  	int index = to_sensor_dev_attr_2(devattr)->index;
  	struct max6697_data *data = max6697_update_device(dev);
  	int temp;
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	temp = data->temp[nr][index];
  	temp -= data->temp_offset;
  
  	return sprintf(buf, "%d
  ", temp * 1000);
  }

  static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,

  			  char *buf)
  {
  	int index = to_sensor_dev_attr(attr)->index;
  	struct max6697_data *data = max6697_update_device(dev);
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	if (data->chip->alarm_map)
  		index = data->chip->alarm_map[index];
  
  	return sprintf(buf, "%u
  ", (data->alarms >> index) & 0x1);
  }

  static ssize_t temp_store(struct device *dev,
  			  struct device_attribute *devattr, const char *buf,
  			  size_t count)

  {
  	int nr = to_sensor_dev_attr_2(devattr)->nr;
  	int index = to_sensor_dev_attr_2(devattr)->index;

  	struct max6697_data *data = dev_get_drvdata(dev);

  	long temp;
  	int ret;
  
  	ret = kstrtol(buf, 10, &temp);
  	if (ret < 0)
  		return ret;
  
  	mutex_lock(&data->update_lock);
  	temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset;
  	temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127);
  	data->temp[nr][index] = temp;

  	ret = i2c_smbus_write_byte_data(data->client,

  					index == 2 ? MAX6697_REG_MAX[nr]
  						   : MAX6697_REG_CRIT[nr],
  					temp);
  	mutex_unlock(&data->update_lock);
  
  	return ret < 0 ? ret : count;
  }

  static ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf,
  			    size_t count)
  {
  	int val, ret, index, select;
  	struct max6697_data *data;
  	bool channel_enabled;
  	long temp;
  
  	index = to_sensor_dev_attr(devattr)->index;
  	data = dev_get_drvdata(dev);
  	ret = kstrtol(buf, 10, &temp);
  	if (ret < 0)
  		return ret;
  
  	mutex_lock(&data->update_lock);
  	select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
  	if (select < 0) {
  		ret = select;
  		goto abort;
  	}
  	channel_enabled = (select & (1 << (index - 1)));
  	temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX);
  	val = DIV_ROUND_CLOSEST(temp, 250);
  	/* disable the offset for channel if the new offset is 0 */
  	if (val == 0) {
  		if (channel_enabled)
  			ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
  							select & ~(1 << (index - 1)));
  		ret = ret < 0 ? ret : count;
  		goto abort;
  	}
  	if (!channel_enabled) {
  		ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT,
  						select | (1 << (index - 1)));
  		if (ret < 0)
  			goto abort;
  	}
  	ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val);
  	ret = ret < 0 ? ret : count;
  
  abort:
  	mutex_unlock(&data->update_lock);
  	return ret;
  }
  
  static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf)
  {
  	struct max6697_data *data;
  	int select, ret, index;
  
  	index = to_sensor_dev_attr(devattr)->index;
  	data = dev_get_drvdata(dev);
  	mutex_lock(&data->update_lock);
  	select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT);
  	if (select < 0)
  		ret = select;
  	else if (select & (1 << (index - 1)))
  		ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET);
  	else
  		ret = 0;
  	mutex_unlock(&data->update_lock);
  	return ret < 0 ? ret : sprintf(buf, "%d
  ", max6581_offset_to_millic(ret));
  }

  static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);
  static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX);
  static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT);
  
  static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);
  static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX);
  static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT);
  
  static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);
  static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX);
  static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT);
  
  static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3);
  static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX);
  static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT);
  
  static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4);
  static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX);
  static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT);
  
  static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5);
  static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX);
  static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT);
  
  static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6);
  static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX);
  static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT);
  
  static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7);
  static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX);
  static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT);
  
  static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22);
  static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16);
  static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17);
  static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18);
  static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19);
  static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20);
  static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21);
  static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23);
  
  static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14);
  static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8);
  static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9);
  static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10);
  static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11);
  static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12);
  static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13);
  static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15);
  
  static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1);
  static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2);
  static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3);
  static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4);
  static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5);
  static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6);
  static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7);

  /* There is no offset for local temperature so starting from temp2 */
  static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1);
  static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2);
  static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3);
  static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4);
  static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5);
  static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6);
  static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7);

  static DEVICE_ATTR(dummy, 0, NULL, NULL);
  
  static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr,
  				  int index)
  {
  	struct device *dev = container_of(kobj, struct device, kobj);

  	struct max6697_data *data = dev_get_drvdata(dev);

  	const struct max6697_chip_data *chip = data->chip;

  	int channel = index / 7;	/* channel number */
  	int nr = index % 7;		/* attribute index within channel */

  
  	if (channel >= chip->channels)
  		return 0;
  
  	if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel)))
  		return 0;
  	if (nr == 5 && !(chip->have_fault & (1 << channel)))
  		return 0;

  	/* offset reg is only supported on max6581 remote channels */
  	if (nr == 6)
  		if (data->type != max6581 || channel == 0)
  			return 0;

  
  	return attr->mode;
  }
  
  /*
   * max6697_is_visible uses the index into the following array to determine
   * if attributes should be created or not. Any change in order or content
   * must be matched in max6697_is_visible.
   */
  static struct attribute *max6697_attributes[] = {
  	&sensor_dev_attr_temp1_input.dev_attr.attr,
  	&sensor_dev_attr_temp1_max.dev_attr.attr,
  	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp1_crit.dev_attr.attr,
  	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
  	&dev_attr_dummy.attr,

  	&dev_attr_dummy.attr,

  
  	&sensor_dev_attr_temp2_input.dev_attr.attr,
  	&sensor_dev_attr_temp2_max.dev_attr.attr,
  	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_crit.dev_attr.attr,
  	&sensor_dev_attr_temp2_crit_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp2_fault.dev_attr.attr,

  	&sensor_dev_attr_temp2_offset.dev_attr.attr,

  
  	&sensor_dev_attr_temp3_input.dev_attr.attr,
  	&sensor_dev_attr_temp3_max.dev_attr.attr,
  	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp3_crit.dev_attr.attr,
  	&sensor_dev_attr_temp3_crit_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp3_fault.dev_attr.attr,

  	&sensor_dev_attr_temp3_offset.dev_attr.attr,

  
  	&sensor_dev_attr_temp4_input.dev_attr.attr,
  	&sensor_dev_attr_temp4_max.dev_attr.attr,
  	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp4_crit.dev_attr.attr,
  	&sensor_dev_attr_temp4_crit_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp4_fault.dev_attr.attr,

  	&sensor_dev_attr_temp4_offset.dev_attr.attr,

  
  	&sensor_dev_attr_temp5_input.dev_attr.attr,
  	&sensor_dev_attr_temp5_max.dev_attr.attr,
  	&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp5_crit.dev_attr.attr,
  	&sensor_dev_attr_temp5_crit_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp5_fault.dev_attr.attr,

  	&sensor_dev_attr_temp5_offset.dev_attr.attr,

  
  	&sensor_dev_attr_temp6_input.dev_attr.attr,
  	&sensor_dev_attr_temp6_max.dev_attr.attr,
  	&sensor_dev_attr_temp6_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp6_crit.dev_attr.attr,
  	&sensor_dev_attr_temp6_crit_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp6_fault.dev_attr.attr,

  	&sensor_dev_attr_temp6_offset.dev_attr.attr,

  
  	&sensor_dev_attr_temp7_input.dev_attr.attr,
  	&sensor_dev_attr_temp7_max.dev_attr.attr,
  	&sensor_dev_attr_temp7_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp7_crit.dev_attr.attr,
  	&sensor_dev_attr_temp7_crit_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp7_fault.dev_attr.attr,

  	&sensor_dev_attr_temp7_offset.dev_attr.attr,

  
  	&sensor_dev_attr_temp8_input.dev_attr.attr,
  	&sensor_dev_attr_temp8_max.dev_attr.attr,
  	&sensor_dev_attr_temp8_max_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp8_crit.dev_attr.attr,
  	&sensor_dev_attr_temp8_crit_alarm.dev_attr.attr,
  	&sensor_dev_attr_temp8_fault.dev_attr.attr,

  	&sensor_dev_attr_temp8_offset.dev_attr.attr,

  	NULL

  };

  static const struct attribute_group max6697_group = {
  	.attrs = max6697_attributes, .is_visible = max6697_is_visible,

  };

  __ATTRIBUTE_GROUPS(max6697);

  
  static void max6697_get_config_of(struct device_node *node,
  				  struct max6697_platform_data *pdata)
  {
  	int len;
  	const __be32 *prop;

  	pdata->smbus_timeout_disable =
  		of_property_read_bool(node, "smbus-timeout-disable");
  	pdata->extended_range_enable =
  		of_property_read_bool(node, "extended-range-enable");
  	pdata->beta_compensation =
  		of_property_read_bool(node, "beta-compensation-enable");

  	prop = of_get_property(node, "alert-mask", &len);
  	if (prop && len == sizeof(u32))
  		pdata->alert_mask = be32_to_cpu(prop[0]);
  	prop = of_get_property(node, "over-temperature-mask", &len);
  	if (prop && len == sizeof(u32))
  		pdata->over_temperature_mask = be32_to_cpu(prop[0]);
  	prop = of_get_property(node, "resistance-cancellation", &len);
  	if (prop) {
  		if (len == sizeof(u32))
  			pdata->resistance_cancellation = be32_to_cpu(prop[0]);
  		else
  			pdata->resistance_cancellation = 0xfe;
  	}
  	prop = of_get_property(node, "transistor-ideality", &len);
  	if (prop && len == 2 * sizeof(u32)) {
  			pdata->ideality_mask = be32_to_cpu(prop[0]);
  			pdata->ideality_value = be32_to_cpu(prop[1]);
  	}
  }

  static int max6697_init_chip(struct max6697_data *data,
  			     struct i2c_client *client)

  {

  	struct max6697_platform_data *pdata = dev_get_platdata(&client->dev);
  	struct max6697_platform_data p;
  	const struct max6697_chip_data *chip = data->chip;
  	int factor = chip->channels;
  	int ret, reg;
  
  	/*
  	 * Don't touch configuration if neither platform data nor OF
  	 * configuration was specified. If that is the case, use the
  	 * current chip configuration.
  	 */
  	if (!pdata && !client->dev.of_node) {
  		reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG);
  		if (reg < 0)
  			return reg;
  		if (data->type == max6581) {
  			if (reg & MAX6581_CONF_EXTENDED)
  				data->temp_offset = 64;
  			reg = i2c_smbus_read_byte_data(client,
  						       MAX6581_REG_RESISTANCE);
  			if (reg < 0)
  				return reg;
  			factor += hweight8(reg);
  		} else {
  			if (reg & MAX6697_CONF_RESISTANCE)
  				factor++;
  		}
  		goto done;
  	}
  
  	if (client->dev.of_node) {
  		memset(&p, 0, sizeof(p));
  		max6697_get_config_of(client->dev.of_node, &p);
  		pdata = &p;
  	}
  
  	reg = 0;
  	if (pdata->smbus_timeout_disable &&
  	    (chip->valid_conf & MAX6697_CONF_TIMEOUT)) {
  		reg |= MAX6697_CONF_TIMEOUT;
  	}
  	if (pdata->extended_range_enable &&
  	    (chip->valid_conf & MAX6581_CONF_EXTENDED)) {
  		reg |= MAX6581_CONF_EXTENDED;
  		data->temp_offset = 64;
  	}
  	if (pdata->resistance_cancellation &&
  	    (chip->valid_conf & MAX6697_CONF_RESISTANCE)) {
  		reg |= MAX6697_CONF_RESISTANCE;
  		factor++;
  	}
  	if (pdata->beta_compensation &&
  	    (chip->valid_conf & MAX6693_CONF_BETA)) {
  		reg |= MAX6693_CONF_BETA;
  	}
  
  	ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg);
  	if (ret < 0)
  		return ret;
  
  	ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK,

  				MAX6697_ALERT_MAP_BITS(pdata->alert_mask));

  	if (ret < 0)
  		return ret;
  
  	ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,

  			MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask));

  	if (ret < 0)
  		return ret;
  
  	if (data->type == max6581) {
  		factor += hweight8(pdata->resistance_cancellation >> 1);
  		ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE,
  					pdata->resistance_cancellation >> 1);
  		if (ret < 0)
  			return ret;
  		ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY,

  						pdata->ideality_value);

  		if (ret < 0)
  			return ret;
  		ret = i2c_smbus_write_byte_data(client,
  						MAX6581_REG_IDEALITY_SELECT,

  						pdata->ideality_mask >> 1);

  		if (ret < 0)
  			return ret;
  	}
  done:
  	data->update_interval = factor * MAX6697_CONV_TIME;
  	return 0;
  }

  static const struct i2c_device_id max6697_id[];
  
  static int max6697_probe(struct i2c_client *client)

  {
  	struct i2c_adapter *adapter = client->adapter;
  	struct device *dev = &client->dev;
  	struct max6697_data *data;

  	struct device *hwmon_dev;

  	int err;

  
  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  		return -ENODEV;
  
  	data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL);
  	if (!data)
  		return -ENOMEM;

  	if (client->dev.of_node)
  		data->type = (enum chips)of_device_get_match_data(&client->dev);
  	else

  		data->type = i2c_match_id(max6697_id, client)->driver_data;

  	data->chip = &max6697_chip_data[data->type];

  	data->client = client;

  	mutex_init(&data->update_lock);

  	err = max6697_init_chip(data, client);

  	if (err)
  		return err;

  	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
  							   data,
  							   max6697_groups);

  	return PTR_ERR_OR_ZERO(hwmon_dev);

  }
  
  static const struct i2c_device_id max6697_id[] = {
  	{ "max6581", max6581 },
  	{ "max6602", max6602 },
  	{ "max6622", max6622 },
  	{ "max6636", max6636 },
  	{ "max6689", max6689 },
  	{ "max6693", max6693 },
  	{ "max6694", max6694 },
  	{ "max6697", max6697 },
  	{ "max6698", max6698 },
  	{ "max6699", max6699 },
  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, max6697_id);

  static const struct of_device_id __maybe_unused max6697_of_match[] = {

  	{
  		.compatible = "maxim,max6581",
  		.data = (void *)max6581
  	},
  	{
  		.compatible = "maxim,max6602",
  		.data = (void *)max6602
  	},
  	{
  		.compatible = "maxim,max6622",
  		.data = (void *)max6622
  	},
  	{
  		.compatible = "maxim,max6636",
  		.data = (void *)max6636
  	},
  	{
  		.compatible = "maxim,max6689",
  		.data = (void *)max6689
  	},
  	{
  		.compatible = "maxim,max6693",
  		.data = (void *)max6693
  	},
  	{
  		.compatible = "maxim,max6694",
  		.data = (void *)max6694
  	},
  	{
  		.compatible = "maxim,max6697",
  		.data = (void *)max6697
  	},
  	{
  		.compatible = "maxim,max6698",
  		.data = (void *)max6698
  	},
  	{
  		.compatible = "maxim,max6699",
  		.data = (void *)max6699
  	},
  	{ },
  };
  MODULE_DEVICE_TABLE(of, max6697_of_match);

  static struct i2c_driver max6697_driver = {
  	.class = I2C_CLASS_HWMON,
  	.driver = {
  		.name	= "max6697",

  		.of_match_table = of_match_ptr(max6697_of_match),

  	},

  	.probe_new = max6697_probe,

  	.id_table = max6697_id,
  };
  
  module_i2c_driver(max6697_driver);
  
  MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
  MODULE_DESCRIPTION("MAX6697 temperature sensor driver");
  MODULE_LICENSE("GPL");