// SPDX-License-Identifier: GPL-2.0-only

  /*
   * Driver for SMM665 Power Controller / Monitor
   *
   * Copyright (C) 2010 Ericsson AB.
   *

   * This driver should also work for SMM465, SMM764, and SMM766, but is untested
   * for those chips. Only monitoring functionality is implemented.
   *
   * Datasheets:
   * http://www.summitmicro.com/prod_select/summary/SMM665/SMM665B_2089_20.pdf
   * http://www.summitmicro.com/prod_select/summary/SMM766B/SMM766B_2122.pdf
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/err.h>
  #include <linux/slab.h>
  #include <linux/i2c.h>
  #include <linux/hwmon.h>
  #include <linux/hwmon-sysfs.h>
  #include <linux/delay.h>

  #include <linux/jiffies.h>

  
  /* Internal reference voltage (VREF, x 1000 */
  #define SMM665_VREF_ADC_X1000	1250
  
  /* module parameters */
  static int vref = SMM665_VREF_ADC_X1000;
  module_param(vref, int, 0);
  MODULE_PARM_DESC(vref, "Reference voltage in mV");
  
  enum chips { smm465, smm665, smm665c, smm764, smm766 };
  
  /*
   * ADC channel addresses
   */
  #define	SMM665_MISC16_ADC_DATA_A	0x00
  #define	SMM665_MISC16_ADC_DATA_B	0x01
  #define	SMM665_MISC16_ADC_DATA_C	0x02
  #define	SMM665_MISC16_ADC_DATA_D	0x03
  #define	SMM665_MISC16_ADC_DATA_E	0x04
  #define	SMM665_MISC16_ADC_DATA_F	0x05
  #define	SMM665_MISC16_ADC_DATA_VDD	0x06
  #define	SMM665_MISC16_ADC_DATA_12V	0x07
  #define	SMM665_MISC16_ADC_DATA_INT_TEMP	0x08
  #define	SMM665_MISC16_ADC_DATA_AIN1	0x09
  #define	SMM665_MISC16_ADC_DATA_AIN2	0x0a
  
  /*
   * Command registers
   */
  #define	SMM665_MISC8_CMD_STS		0x80
  #define	SMM665_MISC8_STATUS1		0x81
  #define	SMM665_MISC8_STATUSS2		0x82
  #define	SMM665_MISC8_IO_POLARITY	0x83
  #define	SMM665_MISC8_PUP_POLARITY	0x84
  #define	SMM665_MISC8_ADOC_STATUS1	0x85
  #define	SMM665_MISC8_ADOC_STATUS2	0x86
  #define	SMM665_MISC8_WRITE_PROT		0x87
  #define	SMM665_MISC8_STS_TRACK		0x88
  
  /*
   * Configuration registers and register groups
   */
  #define SMM665_ADOC_ENABLE		0x0d
  #define SMM665_LIMIT_BASE		0x80	/* First limit register */
  
  /*
   * Limit register bit masks
   */
  #define SMM665_TRIGGER_RST		0x8000
  #define SMM665_TRIGGER_HEALTHY		0x4000
  #define SMM665_TRIGGER_POWEROFF		0x2000
  #define SMM665_TRIGGER_SHUTDOWN		0x1000
  #define SMM665_ADC_MASK			0x03ff
  
  #define smm665_is_critical(lim)	((lim) & (SMM665_TRIGGER_RST \
  					| SMM665_TRIGGER_POWEROFF \
  					| SMM665_TRIGGER_SHUTDOWN))
  /*
   * Fault register bit definitions
   * Values are merged from status registers 1/2,
   * with status register 1 providing the upper 8 bits.
   */
  #define SMM665_FAULT_A		0x0001
  #define SMM665_FAULT_B		0x0002
  #define SMM665_FAULT_C		0x0004
  #define SMM665_FAULT_D		0x0008
  #define SMM665_FAULT_E		0x0010
  #define SMM665_FAULT_F		0x0020
  #define SMM665_FAULT_VDD	0x0040
  #define SMM665_FAULT_12V	0x0080
  #define SMM665_FAULT_TEMP	0x0100
  #define SMM665_FAULT_AIN1	0x0200
  #define SMM665_FAULT_AIN2	0x0400
  
  /*
   * I2C Register addresses
   *
   * The configuration register needs to be the configured base register.
   * The command/status register address is derived from it.
   */
  #define SMM665_REGMASK		0x78
  #define SMM665_CMDREG_BASE	0x48
  #define SMM665_CONFREG_BASE	0x50
  
  /*
   *  Equations given by chip manufacturer to calculate voltage/temperature values
   *  vref = Reference voltage on VREF_ADC pin (module parameter)
   *  adc  = 10bit ADC value read back from registers
   */
  
  /* Voltage A-F and VDD */
  #define SMM665_VMON_ADC_TO_VOLTS(adc)  ((adc) * vref / 256)
  
  /* Voltage 12VIN */
  #define SMM665_12VIN_ADC_TO_VOLTS(adc) ((adc) * vref * 3 / 256)
  
  /* Voltage AIN1, AIN2 */
  #define SMM665_AIN_ADC_TO_VOLTS(adc)   ((adc) * vref / 512)
  
  /* Temp Sensor */

  #define SMM665_TEMP_ADC_TO_CELSIUS(adc) (((adc) <= 511) ?		   \

  					 ((int)(adc) * 1000 / 4) :	   \

  					 (((int)(adc) - 0x400) * 1000 / 4))

  
  #define SMM665_NUM_ADC		11
  
  /*
   * Chip dependent ADC conversion time, in uS
   */
  #define SMM665_ADC_WAIT_SMM665	70
  #define SMM665_ADC_WAIT_SMM766	185
  
  struct smm665_data {
  	enum chips type;
  	int conversion_time;		/* ADC conversion time */

  	struct i2c_client *client;

  	struct mutex update_lock;
  	bool valid;
  	unsigned long last_updated;	/* in jiffies */
  	u16 adc[SMM665_NUM_ADC];	/* adc values (raw) */
  	u16 faults;			/* fault status */
  	/* The following values are in mV */
  	int critical_min_limit[SMM665_NUM_ADC];
  	int alarm_min_limit[SMM665_NUM_ADC];
  	int critical_max_limit[SMM665_NUM_ADC];
  	int alarm_max_limit[SMM665_NUM_ADC];
  	struct i2c_client *cmdreg;
  };
  
  /*
   * smm665_read16()
   *
   * Read 16 bit value from <reg>, <reg+1>. Upper 8 bits are in <reg>.
   */
  static int smm665_read16(struct i2c_client *client, int reg)
  {
  	int rv, val;
  
  	rv = i2c_smbus_read_byte_data(client, reg);
  	if (rv < 0)
  		return rv;
  	val = rv << 8;
  	rv = i2c_smbus_read_byte_data(client, reg + 1);
  	if (rv < 0)
  		return rv;
  	val |= rv;
  	return val;
  }
  
  /*
   * Read adc value.
   */
  static int smm665_read_adc(struct smm665_data *data, int adc)
  {
  	struct i2c_client *client = data->cmdreg;
  	int rv;
  	int radc;
  
  	/*
  	 * Algorithm for reading ADC, per SMM665 datasheet
  	 *
  	 *  {[S][addr][W][Ack]} {[offset][Ack]} {[S][addr][R][Nack]}
  	 * [wait conversion time]
  	 *  {[S][addr][R][Ack]} {[datahi][Ack]} {[datalo][Ack][P]}
  	 *
  	 * To implement the first part of this exchange,
  	 * do a full read transaction and expect a failure/Nack.
  	 * This sets up the address pointer on the SMM665
  	 * and starts the ADC conversion.
  	 * Then do a two-byte read transaction.
  	 */
  	rv = i2c_smbus_read_byte_data(client, adc << 3);
  	if (rv != -ENXIO) {
  		/*
  		 * We expect ENXIO to reflect NACK

  		 * (per Documentation/i2c/fault-codes.rst).

  		 * Everything else is an error.
  		 */
  		dev_dbg(&client->dev,
  			"Unexpected return code %d when setting ADC index", rv);
  		return (rv < 0) ? rv : -EIO;
  	}
  
  	udelay(data->conversion_time);
  
  	/*
  	 * Now read two bytes.
  	 *
  	 * Neither i2c_smbus_read_byte() nor
  	 * i2c_smbus_read_block_data() worked here,

  	 * so use i2c_smbus_read_word_swapped() instead.

  	 * We could also try to use i2c_master_recv(),
  	 * but that is not always supported.
  	 */

  	rv = i2c_smbus_read_word_swapped(client, 0);

  	if (rv < 0) {
  		dev_dbg(&client->dev, "Failed to read ADC value: error %d", rv);

  		return rv;

  	}
  	/*
  	 * Validate/verify readback adc channel (in bit 11..14).

  	 */

  	radc = (rv >> 11) & 0x0f;

  	if (radc != adc) {
  		dev_dbg(&client->dev, "Unexpected RADC: Expected %d got %d",
  			adc, radc);
  		return -EIO;
  	}

  	return rv & SMM665_ADC_MASK;

  }
  
  static struct smm665_data *smm665_update_device(struct device *dev)
  {

  	struct smm665_data *data = dev_get_drvdata(dev);
  	struct i2c_client *client = data->client;

  	struct smm665_data *ret = data;
  
  	mutex_lock(&data->update_lock);
  
  	if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
  		int i, val;
  
  		/*
  		 * read status registers
  		 */
  		val = smm665_read16(client, SMM665_MISC8_STATUS1);
  		if (unlikely(val < 0)) {
  			ret = ERR_PTR(val);
  			goto abort;
  		}
  		data->faults = val;
  
  		/* Read adc registers */
  		for (i = 0; i < SMM665_NUM_ADC; i++) {
  			val = smm665_read_adc(data, i);
  			if (unlikely(val < 0)) {
  				ret = ERR_PTR(val);
  				goto abort;
  			}
  			data->adc[i] = val;
  		}
  		data->last_updated = jiffies;
  		data->valid = 1;
  	}
  abort:
  	mutex_unlock(&data->update_lock);
  	return ret;
  }
  
  /* Return converted value from given adc */
  static int smm665_convert(u16 adcval, int index)
  {
  	int val = 0;
  
  	switch (index) {
  	case SMM665_MISC16_ADC_DATA_12V:
  		val = SMM665_12VIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
  		break;
  
  	case SMM665_MISC16_ADC_DATA_VDD:
  	case SMM665_MISC16_ADC_DATA_A:
  	case SMM665_MISC16_ADC_DATA_B:
  	case SMM665_MISC16_ADC_DATA_C:
  	case SMM665_MISC16_ADC_DATA_D:
  	case SMM665_MISC16_ADC_DATA_E:
  	case SMM665_MISC16_ADC_DATA_F:
  		val = SMM665_VMON_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
  		break;
  
  	case SMM665_MISC16_ADC_DATA_AIN1:
  	case SMM665_MISC16_ADC_DATA_AIN2:
  		val = SMM665_AIN_ADC_TO_VOLTS(adcval & SMM665_ADC_MASK);
  		break;
  
  	case SMM665_MISC16_ADC_DATA_INT_TEMP:
  		val = SMM665_TEMP_ADC_TO_CELSIUS(adcval & SMM665_ADC_MASK);
  		break;
  
  	default:
  		/* If we get here, the developer messed up */
  		WARN_ON_ONCE(1);
  		break;
  	}
  
  	return val;
  }
  
  static int smm665_get_min(struct device *dev, int index)
  {

  	struct smm665_data *data = dev_get_drvdata(dev);

  
  	return data->alarm_min_limit[index];
  }
  
  static int smm665_get_max(struct device *dev, int index)
  {

  	struct smm665_data *data = dev_get_drvdata(dev);

  
  	return data->alarm_max_limit[index];
  }
  
  static int smm665_get_lcrit(struct device *dev, int index)
  {

  	struct smm665_data *data = dev_get_drvdata(dev);

  
  	return data->critical_min_limit[index];
  }
  
  static int smm665_get_crit(struct device *dev, int index)
  {

  	struct smm665_data *data = dev_get_drvdata(dev);

  
  	return data->critical_max_limit[index];
  }
  
  static ssize_t smm665_show_crit_alarm(struct device *dev,
  				      struct device_attribute *da, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
  	struct smm665_data *data = smm665_update_device(dev);
  	int val = 0;
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	if (data->faults & (1 << attr->index))
  		val = 1;
  
  	return snprintf(buf, PAGE_SIZE, "%d
  ", val);
  }
  
  static ssize_t smm665_show_input(struct device *dev,
  				 struct device_attribute *da, char *buf)
  {
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
  	struct smm665_data *data = smm665_update_device(dev);
  	int adc = attr->index;
  	int val;
  
  	if (IS_ERR(data))
  		return PTR_ERR(data);
  
  	val = smm665_convert(data->adc[adc], adc);
  	return snprintf(buf, PAGE_SIZE, "%d
  ", val);
  }
  
  #define SMM665_SHOW(what) \

  static ssize_t smm665_show_##what(struct device *dev, \

  				    struct device_attribute *da, char *buf) \
  { \
  	struct sensor_device_attribute *attr = to_sensor_dev_attr(da); \
  	const int val = smm665_get_##what(dev, attr->index); \
  	return snprintf(buf, PAGE_SIZE, "%d
  ", val); \
  }
  
  SMM665_SHOW(min);
  SMM665_SHOW(max);
  SMM665_SHOW(lcrit);
  SMM665_SHOW(crit);

  /*
   * These macros are used below in constructing device attribute objects

   * for use with sysfs_create_group() to make a sysfs device file
   * for each register.
   */
  
  #define SMM665_ATTR(name, type, cmd_idx) \
  	static SENSOR_DEVICE_ATTR(name##_##type, S_IRUGO, \
  				  smm665_show_##type, NULL, cmd_idx)
  
  /* Construct a sensor_device_attribute structure for each register */
  
  /* Input voltages */
  SMM665_ATTR(in1, input, SMM665_MISC16_ADC_DATA_12V);
  SMM665_ATTR(in2, input, SMM665_MISC16_ADC_DATA_VDD);
  SMM665_ATTR(in3, input, SMM665_MISC16_ADC_DATA_A);
  SMM665_ATTR(in4, input, SMM665_MISC16_ADC_DATA_B);
  SMM665_ATTR(in5, input, SMM665_MISC16_ADC_DATA_C);
  SMM665_ATTR(in6, input, SMM665_MISC16_ADC_DATA_D);
  SMM665_ATTR(in7, input, SMM665_MISC16_ADC_DATA_E);
  SMM665_ATTR(in8, input, SMM665_MISC16_ADC_DATA_F);
  SMM665_ATTR(in9, input, SMM665_MISC16_ADC_DATA_AIN1);
  SMM665_ATTR(in10, input, SMM665_MISC16_ADC_DATA_AIN2);
  
  /* Input voltages min */
  SMM665_ATTR(in1, min, SMM665_MISC16_ADC_DATA_12V);
  SMM665_ATTR(in2, min, SMM665_MISC16_ADC_DATA_VDD);
  SMM665_ATTR(in3, min, SMM665_MISC16_ADC_DATA_A);
  SMM665_ATTR(in4, min, SMM665_MISC16_ADC_DATA_B);
  SMM665_ATTR(in5, min, SMM665_MISC16_ADC_DATA_C);
  SMM665_ATTR(in6, min, SMM665_MISC16_ADC_DATA_D);
  SMM665_ATTR(in7, min, SMM665_MISC16_ADC_DATA_E);
  SMM665_ATTR(in8, min, SMM665_MISC16_ADC_DATA_F);
  SMM665_ATTR(in9, min, SMM665_MISC16_ADC_DATA_AIN1);
  SMM665_ATTR(in10, min, SMM665_MISC16_ADC_DATA_AIN2);
  
  /* Input voltages max */
  SMM665_ATTR(in1, max, SMM665_MISC16_ADC_DATA_12V);
  SMM665_ATTR(in2, max, SMM665_MISC16_ADC_DATA_VDD);
  SMM665_ATTR(in3, max, SMM665_MISC16_ADC_DATA_A);
  SMM665_ATTR(in4, max, SMM665_MISC16_ADC_DATA_B);
  SMM665_ATTR(in5, max, SMM665_MISC16_ADC_DATA_C);
  SMM665_ATTR(in6, max, SMM665_MISC16_ADC_DATA_D);
  SMM665_ATTR(in7, max, SMM665_MISC16_ADC_DATA_E);
  SMM665_ATTR(in8, max, SMM665_MISC16_ADC_DATA_F);
  SMM665_ATTR(in9, max, SMM665_MISC16_ADC_DATA_AIN1);
  SMM665_ATTR(in10, max, SMM665_MISC16_ADC_DATA_AIN2);
  
  /* Input voltages lcrit */
  SMM665_ATTR(in1, lcrit, SMM665_MISC16_ADC_DATA_12V);
  SMM665_ATTR(in2, lcrit, SMM665_MISC16_ADC_DATA_VDD);
  SMM665_ATTR(in3, lcrit, SMM665_MISC16_ADC_DATA_A);
  SMM665_ATTR(in4, lcrit, SMM665_MISC16_ADC_DATA_B);
  SMM665_ATTR(in5, lcrit, SMM665_MISC16_ADC_DATA_C);
  SMM665_ATTR(in6, lcrit, SMM665_MISC16_ADC_DATA_D);
  SMM665_ATTR(in7, lcrit, SMM665_MISC16_ADC_DATA_E);
  SMM665_ATTR(in8, lcrit, SMM665_MISC16_ADC_DATA_F);
  SMM665_ATTR(in9, lcrit, SMM665_MISC16_ADC_DATA_AIN1);
  SMM665_ATTR(in10, lcrit, SMM665_MISC16_ADC_DATA_AIN2);
  
  /* Input voltages crit */
  SMM665_ATTR(in1, crit, SMM665_MISC16_ADC_DATA_12V);
  SMM665_ATTR(in2, crit, SMM665_MISC16_ADC_DATA_VDD);
  SMM665_ATTR(in3, crit, SMM665_MISC16_ADC_DATA_A);
  SMM665_ATTR(in4, crit, SMM665_MISC16_ADC_DATA_B);
  SMM665_ATTR(in5, crit, SMM665_MISC16_ADC_DATA_C);
  SMM665_ATTR(in6, crit, SMM665_MISC16_ADC_DATA_D);
  SMM665_ATTR(in7, crit, SMM665_MISC16_ADC_DATA_E);
  SMM665_ATTR(in8, crit, SMM665_MISC16_ADC_DATA_F);
  SMM665_ATTR(in9, crit, SMM665_MISC16_ADC_DATA_AIN1);
  SMM665_ATTR(in10, crit, SMM665_MISC16_ADC_DATA_AIN2);
  
  /* critical alarms */
  SMM665_ATTR(in1, crit_alarm, SMM665_FAULT_12V);
  SMM665_ATTR(in2, crit_alarm, SMM665_FAULT_VDD);
  SMM665_ATTR(in3, crit_alarm, SMM665_FAULT_A);
  SMM665_ATTR(in4, crit_alarm, SMM665_FAULT_B);
  SMM665_ATTR(in5, crit_alarm, SMM665_FAULT_C);
  SMM665_ATTR(in6, crit_alarm, SMM665_FAULT_D);
  SMM665_ATTR(in7, crit_alarm, SMM665_FAULT_E);
  SMM665_ATTR(in8, crit_alarm, SMM665_FAULT_F);
  SMM665_ATTR(in9, crit_alarm, SMM665_FAULT_AIN1);
  SMM665_ATTR(in10, crit_alarm, SMM665_FAULT_AIN2);
  
  /* Temperature */
  SMM665_ATTR(temp1, input, SMM665_MISC16_ADC_DATA_INT_TEMP);
  SMM665_ATTR(temp1, min, SMM665_MISC16_ADC_DATA_INT_TEMP);
  SMM665_ATTR(temp1, max, SMM665_MISC16_ADC_DATA_INT_TEMP);
  SMM665_ATTR(temp1, lcrit, SMM665_MISC16_ADC_DATA_INT_TEMP);
  SMM665_ATTR(temp1, crit, SMM665_MISC16_ADC_DATA_INT_TEMP);
  SMM665_ATTR(temp1, crit_alarm, SMM665_FAULT_TEMP);
  
  /*
   * Finally, construct an array of pointers to members of the above objects,
   * as required for sysfs_create_group()
   */

  static struct attribute *smm665_attrs[] = {

  	&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_in1_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in1_crit.dev_attr.attr,
  	&sensor_dev_attr_in1_crit_alarm.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_in2_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in2_crit.dev_attr.attr,
  	&sensor_dev_attr_in2_crit_alarm.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_in3_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in3_crit.dev_attr.attr,
  	&sensor_dev_attr_in3_crit_alarm.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_in4_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in4_crit.dev_attr.attr,
  	&sensor_dev_attr_in4_crit_alarm.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_in5_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in5_crit.dev_attr.attr,
  	&sensor_dev_attr_in5_crit_alarm.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_in6_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in6_crit.dev_attr.attr,
  	&sensor_dev_attr_in6_crit_alarm.dev_attr.attr,
  
  	&sensor_dev_attr_in7_input.dev_attr.attr,
  	&sensor_dev_attr_in7_min.dev_attr.attr,
  	&sensor_dev_attr_in7_max.dev_attr.attr,
  	&sensor_dev_attr_in7_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in7_crit.dev_attr.attr,
  	&sensor_dev_attr_in7_crit_alarm.dev_attr.attr,
  
  	&sensor_dev_attr_in8_input.dev_attr.attr,
  	&sensor_dev_attr_in8_min.dev_attr.attr,
  	&sensor_dev_attr_in8_max.dev_attr.attr,
  	&sensor_dev_attr_in8_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in8_crit.dev_attr.attr,
  	&sensor_dev_attr_in8_crit_alarm.dev_attr.attr,
  
  	&sensor_dev_attr_in9_input.dev_attr.attr,
  	&sensor_dev_attr_in9_min.dev_attr.attr,
  	&sensor_dev_attr_in9_max.dev_attr.attr,
  	&sensor_dev_attr_in9_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in9_crit.dev_attr.attr,
  	&sensor_dev_attr_in9_crit_alarm.dev_attr.attr,
  
  	&sensor_dev_attr_in10_input.dev_attr.attr,
  	&sensor_dev_attr_in10_min.dev_attr.attr,
  	&sensor_dev_attr_in10_max.dev_attr.attr,
  	&sensor_dev_attr_in10_lcrit.dev_attr.attr,
  	&sensor_dev_attr_in10_crit.dev_attr.attr,
  	&sensor_dev_attr_in10_crit_alarm.dev_attr.attr,
  
  	&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_lcrit.dev_attr.attr,
  	&sensor_dev_attr_temp1_crit.dev_attr.attr,
  	&sensor_dev_attr_temp1_crit_alarm.dev_attr.attr,
  
  	NULL,
  };

  ATTRIBUTE_GROUPS(smm665);

  static const struct i2c_device_id smm665_id[];
  
  static int smm665_probe(struct i2c_client *client)

  {
  	struct i2c_adapter *adapter = client->adapter;
  	struct smm665_data *data;

  	struct device *hwmon_dev;

  	int i, ret;
  
  	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
  				     | I2C_FUNC_SMBUS_WORD_DATA))
  		return -ENODEV;
  
  	if (i2c_smbus_read_byte_data(client, SMM665_ADOC_ENABLE) < 0)
  		return -ENODEV;

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

  	if (!data)

  		return -ENOMEM;

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

  	data->client = client;

  	data->type = i2c_match_id(smm665_id, client)->driver_data;

  	data->cmdreg = i2c_new_dummy_device(adapter, (client->addr & ~SMM665_REGMASK)

  				     | SMM665_CMDREG_BASE);

  	if (IS_ERR(data->cmdreg))
  		return PTR_ERR(data->cmdreg);

  
  	switch (data->type) {
  	case smm465:
  	case smm665:
  		data->conversion_time = SMM665_ADC_WAIT_SMM665;
  		break;
  	case smm665c:
  	case smm764:
  	case smm766:
  		data->conversion_time = SMM665_ADC_WAIT_SMM766;
  		break;
  	}
  
  	ret = -ENODEV;
  	if (i2c_smbus_read_byte_data(data->cmdreg, SMM665_MISC8_CMD_STS) < 0)
  		goto out_unregister;
  
  	/*
  	 * Read limits.
  	 *
  	 * Limit registers start with register SMM665_LIMIT_BASE.
  	 * Each channel uses 8 registers, providing four limit values
  	 * per channel. Each limit value requires two registers, with the
  	 * high byte in the first register and the low byte in the second
  	 * register. The first two limits are under limit values, followed
  	 * by two over limit values.
  	 *
  	 * Limit register order matches the ADC register order, so we use
  	 * ADC register defines throughout the code to index limit registers.
  	 *
  	 * We save the first retrieved value both as "critical" and "alarm"
  	 * value. The second value overwrites either the critical or the
  	 * alarm value, depending on its configuration. This ensures that both
  	 * critical and alarm values are initialized, even if both registers are
  	 * configured as critical or non-critical.
  	 */
  	for (i = 0; i < SMM665_NUM_ADC; i++) {
  		int val;
  
  		val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8);
  		if (unlikely(val < 0))
  			goto out_unregister;
  		data->critical_min_limit[i] = data->alarm_min_limit[i]
  		  = smm665_convert(val, i);
  		val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 2);
  		if (unlikely(val < 0))
  			goto out_unregister;
  		if (smm665_is_critical(val))
  			data->critical_min_limit[i] = smm665_convert(val, i);
  		else
  			data->alarm_min_limit[i] = smm665_convert(val, i);
  		val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 4);
  		if (unlikely(val < 0))
  			goto out_unregister;
  		data->critical_max_limit[i] = data->alarm_max_limit[i]
  		  = smm665_convert(val, i);
  		val = smm665_read16(client, SMM665_LIMIT_BASE + i * 8 + 6);
  		if (unlikely(val < 0))
  			goto out_unregister;
  		if (smm665_is_critical(val))
  			data->critical_max_limit[i] = smm665_convert(val, i);
  		else
  			data->alarm_max_limit[i] = smm665_convert(val, i);
  	}

  	hwmon_dev = devm_hwmon_device_register_with_groups(&client->dev,
  							   client->name, data,
  							   smm665_groups);
  	if (IS_ERR(hwmon_dev)) {
  		ret = PTR_ERR(hwmon_dev);

  		goto out_unregister;

  	}
  
  	return 0;

  out_unregister:
  	i2c_unregister_device(data->cmdreg);

  	return ret;
  }
  
  static int smm665_remove(struct i2c_client *client)
  {
  	struct smm665_data *data = i2c_get_clientdata(client);
  
  	i2c_unregister_device(data->cmdreg);

  	return 0;
  }
  
  static const struct i2c_device_id smm665_id[] = {
  	{"smm465", smm465},
  	{"smm665", smm665},
  	{"smm665c", smm665c},
  	{"smm764", smm764},
  	{"smm766", smm766},
  	{}
  };
  
  MODULE_DEVICE_TABLE(i2c, smm665_id);
  
  /* This is the driver that will be inserted */
  static struct i2c_driver smm665_driver = {
  	.driver = {
  		   .name = "smm665",
  		   },

  	.probe_new = smm665_probe,

  	.remove = smm665_remove,
  	.id_table = smm665_id,
  };

  module_i2c_driver(smm665_driver);

  
  MODULE_AUTHOR("Guenter Roeck");
  MODULE_DESCRIPTION("SMM665 driver");
  MODULE_LICENSE("GPL");