drivers/hwmon/max16065.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Driver for
  *  Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable
  *  System Managers with Nonvolatile Fault Registers
  *  Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers
  *  with Nonvolatile Fault Registers
  *  Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System
  *  Monitors with Nonvolatile Fault Registers
  *
  * Copyright (C) 2011 Ericsson AB.
  */

 #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/jiffies.h>

 enum chips { max16065, max16066, max16067, max16068, max16070, max16071 };

 /*
  * Registers
  */
 #define MAX16065_ADC(x)		((x) * 2)

 #define MAX16065_CURR_SENSE	0x18
 #define MAX16065_CSP_ADC	0x19
 #define MAX16065_FAULT(x)	(0x1b + (x))
 #define MAX16065_SCALE(x)	(0x43 + (x))
 #define MAX16065_CURR_CONTROL	0x47
 #define MAX16065_LIMIT(l, x)	(0x48 + (l) + (x) * 3)	/*
 							 * l: limit
 							 *  0: min/max
 							 *  1: crit
 							 *  2: lcrit
 							 * x: ADC index
 							 */

 #define MAX16065_SW_ENABLE	0x73

 #define MAX16065_WARNING_OV	(1 << 3) /* Set if secondary threshold is OV
 					    warning */

 #define MAX16065_CURR_ENABLE	(1 << 0)

 #define MAX16065_NUM_LIMIT	3
 #define MAX16065_NUM_ADC	12	/* maximum number of ADC channels */

 static const int max16065_num_adc[] = {
 	[max16065] = 12,
 	[max16066] = 8,
 	[max16067] = 6,
 	[max16068] = 6,
 	[max16070] = 12,
 	[max16071] = 8,
 };

 static const bool max16065_have_secondary[] = {
 	[max16065] = true,
 	[max16066] = true,
 	[max16067] = false,
 	[max16068] = false,
 	[max16070] = true,
 	[max16071] = true,
 };

 static const bool max16065_have_current[] = {
 	[max16065] = true,
 	[max16066] = true,
 	[max16067] = false,
 	[max16068] = false,
 	[max16070] = true,
 	[max16071] = true,
 };

 struct max16065_data {
 	enum chips type;
 	struct i2c_client *client;
 	const struct attribute_group *groups[4];
 	struct mutex update_lock;
 	bool valid;
 	unsigned long last_updated; /* in jiffies */
 	int num_adc;
 	bool have_current;
 	int curr_gain;
 	/* limits are in mV */
 	int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC];
 	int range[MAX16065_NUM_ADC + 1];/* voltage range */
 	int adc[MAX16065_NUM_ADC + 1];	/* adc values (raw) including csp_adc */
 	int curr_sense;
 	int fault[2];
 };

 static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
 static const int max16065_csp_adc_range[] = { 7000, 14000 };

 /* ADC registers have 10 bit resolution. */
 static inline int ADC_TO_MV(int adc, int range)
 {
 	return (adc * range) / 1024;
 }

 /*
  * Limit registers have 8 bit resolution and match upper 8 bits of ADC
  * registers.
  */
 static inline int LIMIT_TO_MV(int limit, int range)
 {
 	return limit * range / 256;
 }

 static inline int MV_TO_LIMIT(int mv, int range)
 {
 	return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
 }

 static inline int ADC_TO_CURR(int adc, int gain)
 {
 	return adc * 1400000 / (gain * 255);
 }

 /*
  * max16065_read_adc()
  *
  * Read 16 bit value from <reg>, <reg+1>.
  * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>.
  */
 static int max16065_read_adc(struct i2c_client *client, int reg)
 {
 	int rv;

 	rv = i2c_smbus_read_word_swapped(client, reg);
 	if (unlikely(rv < 0))
 		return rv;
 	return rv >> 6;
 }

 static struct max16065_data *max16065_update_device(struct device *dev)
 {
 	struct max16065_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) || !data->valid) {
 		int i;

 		for (i = 0; i < data->num_adc; i++)
 			data->adc[i]
 			  = max16065_read_adc(client, MAX16065_ADC(i));

 		if (data->have_current) {
 			data->adc[MAX16065_NUM_ADC]
 			  = max16065_read_adc(client, MAX16065_CSP_ADC);
 			data->curr_sense
 			  = i2c_smbus_read_byte_data(client,
 						     MAX16065_CURR_SENSE);
 		}

 		for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++)
 			data->fault[i]
 			  = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i));

 		data->last_updated = jiffies;
 		data->valid = 1;
 	}
 	mutex_unlock(&data->update_lock);
 	return data;
 }

 static ssize_t max16065_alarm_show(struct device *dev,
 				   struct device_attribute *da, char *buf)
 {
 	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
 	struct max16065_data *data = max16065_update_device(dev);
 	int val = data->fault[attr2->nr];

 	if (val < 0)
 		return val;

 	val &= (1 << attr2->index);
 	if (val)
 		i2c_smbus_write_byte_data(data->client,
 					  MAX16065_FAULT(attr2->nr), val);

 	return snprintf(buf, PAGE_SIZE, "%d\n", !!val);
 }

 static ssize_t max16065_input_show(struct device *dev,
 				   struct device_attribute *da, char *buf)
 {
 	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
 	struct max16065_data *data = max16065_update_device(dev);
 	int adc = data->adc[attr->index];

 	if (unlikely(adc < 0))
 		return adc;

 	return snprintf(buf, PAGE_SIZE, "%d\n",
 			ADC_TO_MV(adc, data->range[attr->index]));
 }

 static ssize_t max16065_current_show(struct device *dev,
 				     struct device_attribute *da, char *buf)
 {
 	struct max16065_data *data = max16065_update_device(dev);

 	if (unlikely(data->curr_sense < 0))
 		return data->curr_sense;

 	return snprintf(buf, PAGE_SIZE, "%d\n",
 			ADC_TO_CURR(data->curr_sense, data->curr_gain));
 }

 static ssize_t max16065_limit_store(struct device *dev,
 				    struct device_attribute *da,
 				    const char *buf, size_t count)
 {
 	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
 	struct max16065_data *data = dev_get_drvdata(dev);
 	unsigned long val;
 	int err;
 	int limit;

 	err = kstrtoul(buf, 10, &val);
 	if (unlikely(err < 0))
 		return err;

 	limit = MV_TO_LIMIT(val, data->range[attr2->index]);

 	mutex_lock(&data->update_lock);
 	data->limit[attr2->nr][attr2->index]
 	  = LIMIT_TO_MV(limit, data->range[attr2->index]);
 	i2c_smbus_write_byte_data(data->client,
 				  MAX16065_LIMIT(attr2->nr, attr2->index),
 				  limit);
 	mutex_unlock(&data->update_lock);

 	return count;
 }

 static ssize_t max16065_limit_show(struct device *dev,
 				   struct device_attribute *da, char *buf)
 {
 	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
 	struct max16065_data *data = dev_get_drvdata(dev);

 	return snprintf(buf, PAGE_SIZE, "%d\n",
 			data->limit[attr2->nr][attr2->index]);
 }

 /* Construct a sensor_device_attribute structure for each register */

 /* Input voltages */
 static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0);
 static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1);
 static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2);
 static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3);
 static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4);
 static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5);
 static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6);
 static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7);
 static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8);
 static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9);
 static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10);
 static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11);
 static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12);

 /* Input voltages lcrit */
 static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0);
 static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1);
 static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2);
 static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3);
 static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4);
 static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5);
 static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6);
 static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7);
 static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8);
 static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9);
 static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10);
 static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11);

 /* Input voltages crit */
 static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0);
 static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1);
 static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2);
 static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3);
 static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4);
 static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5);
 static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6);
 static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7);
 static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8);
 static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9);
 static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10);
 static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11);

 /* Input voltages min */
 static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0);
 static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1);
 static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2);
 static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3);
 static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4);
 static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5);
 static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6);
 static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7);
 static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8);
 static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9);
 static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10);
 static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11);

 /* Input voltages max */
 static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0);
 static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1);
 static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2);
 static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3);
 static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4);
 static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5);
 static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6);
 static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7);
 static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8);
 static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9);
 static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10);
 static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11);

 /* alarms */
 static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0);
 static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1);
 static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2);
 static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3);
 static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4);
 static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5);
 static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6);
 static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7);
 static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0);
 static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1);
 static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2);
 static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3);

 /* Current and alarm */
 static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0);
 static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4);

 /*
  * Finally, construct an array of pointers to members of the above objects,
  * as required for sysfs_create_group()
  */
 static struct attribute *max16065_basic_attributes[] = {
 	&sensor_dev_attr_in0_input.dev_attr.attr,
 	&sensor_dev_attr_in0_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in0_crit.dev_attr.attr,
 	&sensor_dev_attr_in0_alarm.dev_attr.attr,

 	&sensor_dev_attr_in1_input.dev_attr.attr,
 	&sensor_dev_attr_in1_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in1_crit.dev_attr.attr,
 	&sensor_dev_attr_in1_alarm.dev_attr.attr,

 	&sensor_dev_attr_in2_input.dev_attr.attr,
 	&sensor_dev_attr_in2_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in2_crit.dev_attr.attr,
 	&sensor_dev_attr_in2_alarm.dev_attr.attr,

 	&sensor_dev_attr_in3_input.dev_attr.attr,
 	&sensor_dev_attr_in3_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in3_crit.dev_attr.attr,
 	&sensor_dev_attr_in3_alarm.dev_attr.attr,

 	&sensor_dev_attr_in4_input.dev_attr.attr,
 	&sensor_dev_attr_in4_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in4_crit.dev_attr.attr,
 	&sensor_dev_attr_in4_alarm.dev_attr.attr,

 	&sensor_dev_attr_in5_input.dev_attr.attr,
 	&sensor_dev_attr_in5_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in5_crit.dev_attr.attr,
 	&sensor_dev_attr_in5_alarm.dev_attr.attr,

 	&sensor_dev_attr_in6_input.dev_attr.attr,
 	&sensor_dev_attr_in6_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in6_crit.dev_attr.attr,
 	&sensor_dev_attr_in6_alarm.dev_attr.attr,

 	&sensor_dev_attr_in7_input.dev_attr.attr,
 	&sensor_dev_attr_in7_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in7_crit.dev_attr.attr,
 	&sensor_dev_attr_in7_alarm.dev_attr.attr,

 	&sensor_dev_attr_in8_input.dev_attr.attr,
 	&sensor_dev_attr_in8_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in8_crit.dev_attr.attr,
 	&sensor_dev_attr_in8_alarm.dev_attr.attr,

 	&sensor_dev_attr_in9_input.dev_attr.attr,
 	&sensor_dev_attr_in9_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in9_crit.dev_attr.attr,
 	&sensor_dev_attr_in9_alarm.dev_attr.attr,

 	&sensor_dev_attr_in10_input.dev_attr.attr,
 	&sensor_dev_attr_in10_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in10_crit.dev_attr.attr,
 	&sensor_dev_attr_in10_alarm.dev_attr.attr,

 	&sensor_dev_attr_in11_input.dev_attr.attr,
 	&sensor_dev_attr_in11_lcrit.dev_attr.attr,
 	&sensor_dev_attr_in11_crit.dev_attr.attr,
 	&sensor_dev_attr_in11_alarm.dev_attr.attr,

 	NULL
 };

 static struct attribute *max16065_current_attributes[] = {
 	&sensor_dev_attr_in12_input.dev_attr.attr,
 	&sensor_dev_attr_curr1_input.dev_attr.attr,
 	&sensor_dev_attr_curr1_alarm.dev_attr.attr,
 	NULL
 };

 static struct attribute *max16065_min_attributes[] = {
 	&sensor_dev_attr_in0_min.dev_attr.attr,
 	&sensor_dev_attr_in1_min.dev_attr.attr,
 	&sensor_dev_attr_in2_min.dev_attr.attr,
 	&sensor_dev_attr_in3_min.dev_attr.attr,
 	&sensor_dev_attr_in4_min.dev_attr.attr,
 	&sensor_dev_attr_in5_min.dev_attr.attr,
 	&sensor_dev_attr_in6_min.dev_attr.attr,
 	&sensor_dev_attr_in7_min.dev_attr.attr,
 	&sensor_dev_attr_in8_min.dev_attr.attr,
 	&sensor_dev_attr_in9_min.dev_attr.attr,
 	&sensor_dev_attr_in10_min.dev_attr.attr,
 	&sensor_dev_attr_in11_min.dev_attr.attr,
 	NULL
 };

 static struct attribute *max16065_max_attributes[] = {
 	&sensor_dev_attr_in0_max.dev_attr.attr,
 	&sensor_dev_attr_in1_max.dev_attr.attr,
 	&sensor_dev_attr_in2_max.dev_attr.attr,
 	&sensor_dev_attr_in3_max.dev_attr.attr,
 	&sensor_dev_attr_in4_max.dev_attr.attr,
 	&sensor_dev_attr_in5_max.dev_attr.attr,
 	&sensor_dev_attr_in6_max.dev_attr.attr,
 	&sensor_dev_attr_in7_max.dev_attr.attr,
 	&sensor_dev_attr_in8_max.dev_attr.attr,
 	&sensor_dev_attr_in9_max.dev_attr.attr,
 	&sensor_dev_attr_in10_max.dev_attr.attr,
 	&sensor_dev_attr_in11_max.dev_attr.attr,
 	NULL
 };

 static umode_t max16065_basic_is_visible(struct kobject *kobj,
 					 struct attribute *a, int n)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct max16065_data *data = dev_get_drvdata(dev);
 	int index = n / 4;

 	if (index >= data->num_adc || !data->range[index])
 		return 0;
 	return a->mode;
 }

 static umode_t max16065_secondary_is_visible(struct kobject *kobj,
 					     struct attribute *a, int index)
 {
 	struct device *dev = container_of(kobj, struct device, kobj);
 	struct max16065_data *data = dev_get_drvdata(dev);

 	if (index >= data->num_adc)
 		return 0;
 	return a->mode;
 }

 static const struct attribute_group max16065_basic_group = {
 	.attrs = max16065_basic_attributes,
 	.is_visible = max16065_basic_is_visible,
 };

 static const struct attribute_group max16065_current_group = {
 	.attrs = max16065_current_attributes,
 };

 static const struct attribute_group max16065_min_group = {
 	.attrs = max16065_min_attributes,
 	.is_visible = max16065_secondary_is_visible,
 };

 static const struct attribute_group max16065_max_group = {
 	.attrs = max16065_max_attributes,
 	.is_visible = max16065_secondary_is_visible,
 };

 static const struct i2c_device_id max16065_id[];

 static int max16065_probe(struct i2c_client *client)
 {
 	struct i2c_adapter *adapter = client->adapter;
 	struct max16065_data *data;
 	struct device *dev = &client->dev;
 	struct device *hwmon_dev;
 	int i, j, val;
 	bool have_secondary;		/* true if chip has secondary limits */
 	bool secondary_is_max = false;	/* secondary limits reflect max */
 	int groups = 0;
 	const struct i2c_device_id *id = i2c_match_id(max16065_id, client);

 	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
 				     | I2C_FUNC_SMBUS_READ_WORD_DATA))
 		return -ENODEV;

 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 	if (unlikely(!data))
 		return -ENOMEM;

 	data->client = client;
 	mutex_init(&data->update_lock);

 	data->num_adc = max16065_num_adc[id->driver_data];
 	data->have_current = max16065_have_current[id->driver_data];
 	have_secondary = max16065_have_secondary[id->driver_data];

 	if (have_secondary) {
 		val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
 		if (unlikely(val < 0))
 			return val;
 		secondary_is_max = val & MAX16065_WARNING_OV;
 	}

 	/* Read scale registers, convert to range */
 	for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
 		val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
 		if (unlikely(val < 0))
 			return val;
 		for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
 			data->range[i * 4 + j] =
 			  max16065_adc_range[(val >> (j * 2)) & 0x3];
 		}
 	}

 	/* Read limits */
 	for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
 		if (i == 0 && !have_secondary)
 			continue;

 		for (j = 0; j < data->num_adc; j++) {
 			val = i2c_smbus_read_byte_data(client,
 						       MAX16065_LIMIT(i, j));
 			if (unlikely(val < 0))
 				return val;
 			data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
 		}
 	}

 	/* sysfs hooks */
 	data->groups[groups++] = &max16065_basic_group;
 	if (have_secondary)
 		data->groups[groups++] = secondary_is_max ?
 			&max16065_max_group : &max16065_min_group;

 	if (data->have_current) {
 		val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
 		if (unlikely(val < 0))
 			return val;
 		if (val & MAX16065_CURR_ENABLE) {
 			/*
 			 * Current gain is 6, 12, 24, 48 based on values in
 			 * bit 2,3.
 			 */
 			data->curr_gain = 6 << ((val >> 2) & 0x03);
 			data->range[MAX16065_NUM_ADC]
 			  = max16065_csp_adc_range[(val >> 1) & 0x01];
 			data->groups[groups++] = &max16065_current_group;
 		} else {
 			data->have_current = false;
 		}
 	}

 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 							   data, data->groups);
 	return PTR_ERR_OR_ZERO(hwmon_dev);
 }

 static const struct i2c_device_id max16065_id[] = {
 	{ "max16065", max16065 },
 	{ "max16066", max16066 },
 	{ "max16067", max16067 },
 	{ "max16068", max16068 },
 	{ "max16070", max16070 },
 	{ "max16071", max16071 },
 	{ }
 };

 MODULE_DEVICE_TABLE(i2c, max16065_id);

 /* This is the driver that will be inserted */
 static struct i2c_driver max16065_driver = {
 	.driver = {
 		.name = "max16065",
 	},
 	.probe_new = max16065_probe,
 	.id_table = max16065_id,
 };

 module_i2c_driver(max16065_driver);

 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
 MODULE_DESCRIPTION("MAX16065 driver");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Driver for
	* Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable
	* System Managers with Nonvolatile Fault Registers
	* Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers
	* with Nonvolatile Fault Registers
	* Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System
	* Monitors with Nonvolatile Fault Registers
	*
	* Copyright (C) 2011 Ericsson AB.
	*/

	#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/jiffies.h>

	enum chips { max16065, max16066, max16067, max16068, max16070, max16071 };

	/*
	* Registers
	*/
	#define MAX16065_ADC(x) ((x) * 2)

	#define MAX16065_CURR_SENSE 0x18
	#define MAX16065_CSP_ADC 0x19
	#define MAX16065_FAULT(x) (0x1b + (x))
	#define MAX16065_SCALE(x) (0x43 + (x))
	#define MAX16065_CURR_CONTROL 0x47
	#define MAX16065_LIMIT(l, x) (0x48 + (l) + (x) * 3) /*
	* l: limit
	* 0: min/max
	* 1: crit
	* 2: lcrit
	* x: ADC index
	*/

	#define MAX16065_SW_ENABLE 0x73

	#define MAX16065_WARNING_OV (1 << 3) /* Set if secondary threshold is OV
	warning */

	#define MAX16065_CURR_ENABLE (1 << 0)

	#define MAX16065_NUM_LIMIT 3
	#define MAX16065_NUM_ADC 12 /* maximum number of ADC channels */

	static const int max16065_num_adc[] = {
	[max16065] = 12,
	[max16066] = 8,
	[max16067] = 6,
	[max16068] = 6,
	[max16070] = 12,
	[max16071] = 8,
	};

	static const bool max16065_have_secondary[] = {
	[max16065] = true,
	[max16066] = true,
	[max16067] = false,
	[max16068] = false,
	[max16070] = true,
	[max16071] = true,
	};

	static const bool max16065_have_current[] = {
	[max16065] = true,
	[max16066] = true,
	[max16067] = false,
	[max16068] = false,
	[max16070] = true,
	[max16071] = true,
	};

	struct max16065_data {
	enum chips type;
	struct i2c_client *client;
	const struct attribute_group *groups[4];
	struct mutex update_lock;
	bool valid;
	unsigned long last_updated; /* in jiffies */
	int num_adc;
	bool have_current;
	int curr_gain;
	/* limits are in mV */
	int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC];
	int range[MAX16065_NUM_ADC + 1];/* voltage range */
	int adc[MAX16065_NUM_ADC + 1]; /* adc values (raw) including csp_adc */
	int curr_sense;
	int fault[2];
	};

	static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 };
	static const int max16065_csp_adc_range[] = { 7000, 14000 };

	/* ADC registers have 10 bit resolution. */
	static inline int ADC_TO_MV(int adc, int range)
	{
	return (adc * range) / 1024;
	}

	/*
	* Limit registers have 8 bit resolution and match upper 8 bits of ADC
	* registers.
	*/
	static inline int LIMIT_TO_MV(int limit, int range)
	{
	return limit * range / 256;
	}

	static inline int MV_TO_LIMIT(int mv, int range)
	{
	return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255);
	}

	static inline int ADC_TO_CURR(int adc, int gain)
	{
	return adc * 1400000 / (gain * 255);
	}

	/*
	* max16065_read_adc()
	*
	* Read 16 bit value from <reg>, <reg+1>.
	* Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>.
	*/
	static int max16065_read_adc(struct i2c_client *client, int reg)
	{
	int rv;

	rv = i2c_smbus_read_word_swapped(client, reg);
	if (unlikely(rv < 0))
	return rv;
	return rv >> 6;
	}

	static struct max16065_data max16065_update_device(struct device dev)
	{
	struct max16065_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) \|\| !data->valid) {
	int i;

	for (i = 0; i < data->num_adc; i++)
	data->adc[i]
	= max16065_read_adc(client, MAX16065_ADC(i));

	if (data->have_current) {
	data->adc[MAX16065_NUM_ADC]
	= max16065_read_adc(client, MAX16065_CSP_ADC);
	data->curr_sense
	= i2c_smbus_read_byte_data(client,
	MAX16065_CURR_SENSE);
	}

	for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++)
	data->fault[i]
	= i2c_smbus_read_byte_data(client, MAX16065_FAULT(i));

	data->last_updated = jiffies;
	data->valid = 1;
	}
	mutex_unlock(&data->update_lock);
	return data;
	}

	static ssize_t max16065_alarm_show(struct device *dev,
	struct device_attribute da, char buf)
	{
	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
	struct max16065_data *data = max16065_update_device(dev);
	int val = data->fault[attr2->nr];

	if (val < 0)
	return val;

	val &= (1 << attr2->index);
	if (val)
	i2c_smbus_write_byte_data(data->client,
	MAX16065_FAULT(attr2->nr), val);

	return snprintf(buf, PAGE_SIZE, "%d\n", !!val);
	}

	static ssize_t max16065_input_show(struct device *dev,
	struct device_attribute da, char buf)
	{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
	struct max16065_data *data = max16065_update_device(dev);
	int adc = data->adc[attr->index];

	if (unlikely(adc < 0))
	return adc;

	return snprintf(buf, PAGE_SIZE, "%d\n",
	ADC_TO_MV(adc, data->range[attr->index]));
	}

	static ssize_t max16065_current_show(struct device *dev,
	struct device_attribute da, char buf)
	{
	struct max16065_data *data = max16065_update_device(dev);

	if (unlikely(data->curr_sense < 0))
	return data->curr_sense;

	return snprintf(buf, PAGE_SIZE, "%d\n",
	ADC_TO_CURR(data->curr_sense, data->curr_gain));
	}

	static ssize_t max16065_limit_store(struct device *dev,
	struct device_attribute *da,
	const char *buf, size_t count)
	{
	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
	struct max16065_data *data = dev_get_drvdata(dev);
	unsigned long val;
	int err;
	int limit;

	err = kstrtoul(buf, 10, &val);
	if (unlikely(err < 0))
	return err;

	limit = MV_TO_LIMIT(val, data->range[attr2->index]);

	mutex_lock(&data->update_lock);
	data->limit[attr2->nr][attr2->index]
	= LIMIT_TO_MV(limit, data->range[attr2->index]);
	i2c_smbus_write_byte_data(data->client,
	MAX16065_LIMIT(attr2->nr, attr2->index),
	limit);
	mutex_unlock(&data->update_lock);

	return count;
	}

	static ssize_t max16065_limit_show(struct device *dev,
	struct device_attribute da, char buf)
	{
	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da);
	struct max16065_data *data = dev_get_drvdata(dev);

	return snprintf(buf, PAGE_SIZE, "%d\n",
	data->limit[attr2->nr][attr2->index]);
	}

	/* Construct a sensor_device_attribute structure for each register */

	/* Input voltages */
	static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0);
	static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1);
	static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2);
	static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3);
	static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4);
	static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5);
	static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6);
	static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7);
	static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8);
	static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9);
	static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10);
	static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11);
	static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12);

	/* Input voltages lcrit */
	static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0);
	static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1);
	static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2);
	static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3);
	static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4);
	static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5);
	static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6);
	static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7);
	static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8);
	static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9);
	static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10);
	static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11);

	/* Input voltages crit */
	static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0);
	static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1);
	static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2);
	static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3);
	static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4);
	static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5);
	static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6);
	static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7);
	static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8);
	static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9);
	static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10);
	static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11);

	/* Input voltages min */
	static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0);
	static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1);
	static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2);
	static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3);
	static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4);
	static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5);
	static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6);
	static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7);
	static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8);
	static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9);
	static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10);
	static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11);

	/* Input voltages max */
	static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0);
	static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1);
	static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2);
	static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3);
	static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4);
	static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5);
	static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6);
	static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7);
	static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8);
	static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9);
	static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10);
	static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11);

	/* alarms */
	static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0);
	static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1);
	static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2);
	static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3);
	static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4);
	static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5);
	static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6);
	static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7);
	static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0);
	static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1);
	static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2);
	static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3);

	/* Current and alarm */
	static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0);
	static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4);

	/*
	* Finally, construct an array of pointers to members of the above objects,
	* as required for sysfs_create_group()
	*/
	static struct attribute *max16065_basic_attributes[] = {
	&sensor_dev_attr_in0_input.dev_attr.attr,
	&sensor_dev_attr_in0_lcrit.dev_attr.attr,
	&sensor_dev_attr_in0_crit.dev_attr.attr,
	&sensor_dev_attr_in0_alarm.dev_attr.attr,

	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in1_lcrit.dev_attr.attr,
	&sensor_dev_attr_in1_crit.dev_attr.attr,
	&sensor_dev_attr_in1_alarm.dev_attr.attr,

	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in2_lcrit.dev_attr.attr,
	&sensor_dev_attr_in2_crit.dev_attr.attr,
	&sensor_dev_attr_in2_alarm.dev_attr.attr,

	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in3_lcrit.dev_attr.attr,
	&sensor_dev_attr_in3_crit.dev_attr.attr,
	&sensor_dev_attr_in3_alarm.dev_attr.attr,

	&sensor_dev_attr_in4_input.dev_attr.attr,
	&sensor_dev_attr_in4_lcrit.dev_attr.attr,
	&sensor_dev_attr_in4_crit.dev_attr.attr,
	&sensor_dev_attr_in4_alarm.dev_attr.attr,

	&sensor_dev_attr_in5_input.dev_attr.attr,
	&sensor_dev_attr_in5_lcrit.dev_attr.attr,
	&sensor_dev_attr_in5_crit.dev_attr.attr,
	&sensor_dev_attr_in5_alarm.dev_attr.attr,

	&sensor_dev_attr_in6_input.dev_attr.attr,
	&sensor_dev_attr_in6_lcrit.dev_attr.attr,
	&sensor_dev_attr_in6_crit.dev_attr.attr,
	&sensor_dev_attr_in6_alarm.dev_attr.attr,

	&sensor_dev_attr_in7_input.dev_attr.attr,
	&sensor_dev_attr_in7_lcrit.dev_attr.attr,
	&sensor_dev_attr_in7_crit.dev_attr.attr,
	&sensor_dev_attr_in7_alarm.dev_attr.attr,

	&sensor_dev_attr_in8_input.dev_attr.attr,
	&sensor_dev_attr_in8_lcrit.dev_attr.attr,
	&sensor_dev_attr_in8_crit.dev_attr.attr,
	&sensor_dev_attr_in8_alarm.dev_attr.attr,

	&sensor_dev_attr_in9_input.dev_attr.attr,
	&sensor_dev_attr_in9_lcrit.dev_attr.attr,
	&sensor_dev_attr_in9_crit.dev_attr.attr,
	&sensor_dev_attr_in9_alarm.dev_attr.attr,

	&sensor_dev_attr_in10_input.dev_attr.attr,
	&sensor_dev_attr_in10_lcrit.dev_attr.attr,
	&sensor_dev_attr_in10_crit.dev_attr.attr,
	&sensor_dev_attr_in10_alarm.dev_attr.attr,

	&sensor_dev_attr_in11_input.dev_attr.attr,
	&sensor_dev_attr_in11_lcrit.dev_attr.attr,
	&sensor_dev_attr_in11_crit.dev_attr.attr,
	&sensor_dev_attr_in11_alarm.dev_attr.attr,

	NULL
	};

	static struct attribute *max16065_current_attributes[] = {
	&sensor_dev_attr_in12_input.dev_attr.attr,
	&sensor_dev_attr_curr1_input.dev_attr.attr,
	&sensor_dev_attr_curr1_alarm.dev_attr.attr,
	NULL
	};

	static struct attribute *max16065_min_attributes[] = {
	&sensor_dev_attr_in0_min.dev_attr.attr,
	&sensor_dev_attr_in1_min.dev_attr.attr,
	&sensor_dev_attr_in2_min.dev_attr.attr,
	&sensor_dev_attr_in3_min.dev_attr.attr,
	&sensor_dev_attr_in4_min.dev_attr.attr,
	&sensor_dev_attr_in5_min.dev_attr.attr,
	&sensor_dev_attr_in6_min.dev_attr.attr,
	&sensor_dev_attr_in7_min.dev_attr.attr,
	&sensor_dev_attr_in8_min.dev_attr.attr,
	&sensor_dev_attr_in9_min.dev_attr.attr,
	&sensor_dev_attr_in10_min.dev_attr.attr,
	&sensor_dev_attr_in11_min.dev_attr.attr,
	NULL
	};

	static struct attribute *max16065_max_attributes[] = {
	&sensor_dev_attr_in0_max.dev_attr.attr,
	&sensor_dev_attr_in1_max.dev_attr.attr,
	&sensor_dev_attr_in2_max.dev_attr.attr,
	&sensor_dev_attr_in3_max.dev_attr.attr,
	&sensor_dev_attr_in4_max.dev_attr.attr,
	&sensor_dev_attr_in5_max.dev_attr.attr,
	&sensor_dev_attr_in6_max.dev_attr.attr,
	&sensor_dev_attr_in7_max.dev_attr.attr,
	&sensor_dev_attr_in8_max.dev_attr.attr,
	&sensor_dev_attr_in9_max.dev_attr.attr,
	&sensor_dev_attr_in10_max.dev_attr.attr,
	&sensor_dev_attr_in11_max.dev_attr.attr,
	NULL
	};

	static umode_t max16065_basic_is_visible(struct kobject *kobj,
	struct attribute *a, int n)
	{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct max16065_data *data = dev_get_drvdata(dev);
	int index = n / 4;

	if (index >= data->num_adc \|\| !data->range[index])
	return 0;
	return a->mode;
	}

	static umode_t max16065_secondary_is_visible(struct kobject *kobj,
	struct attribute *a, int index)
	{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct max16065_data *data = dev_get_drvdata(dev);

	if (index >= data->num_adc)
	return 0;
	return a->mode;
	}

	static const struct attribute_group max16065_basic_group = {
	.attrs = max16065_basic_attributes,
	.is_visible = max16065_basic_is_visible,
	};

	static const struct attribute_group max16065_current_group = {
	.attrs = max16065_current_attributes,
	};

	static const struct attribute_group max16065_min_group = {
	.attrs = max16065_min_attributes,
	.is_visible = max16065_secondary_is_visible,
	};

	static const struct attribute_group max16065_max_group = {
	.attrs = max16065_max_attributes,
	.is_visible = max16065_secondary_is_visible,
	};

	static const struct i2c_device_id max16065_id[];

	static int max16065_probe(struct i2c_client *client)
	{
	struct i2c_adapter *adapter = client->adapter;
	struct max16065_data *data;
	struct device *dev = &client->dev;
	struct device *hwmon_dev;
	int i, j, val;
	bool have_secondary; /* true if chip has secondary limits */
	bool secondary_is_max = false; /* secondary limits reflect max */
	int groups = 0;
	const struct i2c_device_id *id = i2c_match_id(max16065_id, client);

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA
	\| I2C_FUNC_SMBUS_READ_WORD_DATA))
	return -ENODEV;

	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
	if (unlikely(!data))
	return -ENOMEM;

	data->client = client;
	mutex_init(&data->update_lock);

	data->num_adc = max16065_num_adc[id->driver_data];
	data->have_current = max16065_have_current[id->driver_data];
	have_secondary = max16065_have_secondary[id->driver_data];

	if (have_secondary) {
	val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE);
	if (unlikely(val < 0))
	return val;
	secondary_is_max = val & MAX16065_WARNING_OV;
	}

	/* Read scale registers, convert to range */
	for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) {
	val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i));
	if (unlikely(val < 0))
	return val;
	for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) {
	data->range[i * 4 + j] =
	max16065_adc_range[(val >> (j * 2)) & 0x3];
	}
	}

	/* Read limits */
	for (i = 0; i < MAX16065_NUM_LIMIT; i++) {
	if (i == 0 && !have_secondary)
	continue;

	for (j = 0; j < data->num_adc; j++) {
	val = i2c_smbus_read_byte_data(client,
	MAX16065_LIMIT(i, j));
	if (unlikely(val < 0))
	return val;
	data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]);
	}
	}

	/* sysfs hooks */
	data->groups[groups++] = &max16065_basic_group;
	if (have_secondary)
	data->groups[groups++] = secondary_is_max ?
	&max16065_max_group : &max16065_min_group;

	if (data->have_current) {
	val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL);
	if (unlikely(val < 0))
	return val;
	if (val & MAX16065_CURR_ENABLE) {
	/*
	* Current gain is 6, 12, 24, 48 based on values in
	* bit 2,3.
	*/
	data->curr_gain = 6 << ((val >> 2) & 0x03);
	data->range[MAX16065_NUM_ADC]
	= max16065_csp_adc_range[(val >> 1) & 0x01];
	data->groups[groups++] = &max16065_current_group;
	} else {
	data->have_current = false;
	}
	}

	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	data, data->groups);
	return PTR_ERR_OR_ZERO(hwmon_dev);
	}

	static const struct i2c_device_id max16065_id[] = {
	{ "max16065", max16065 },
	{ "max16066", max16066 },
	{ "max16067", max16067 },
	{ "max16068", max16068 },
	{ "max16070", max16070 },
	{ "max16071", max16071 },
	{ }
	};

	MODULE_DEVICE_TABLE(i2c, max16065_id);

	/* This is the driver that will be inserted */
	static struct i2c_driver max16065_driver = {
	.driver = {
	.name = "max16065",
	},
	.probe_new = max16065_probe,
	.id_table = max16065_id,
	};

	module_i2c_driver(max16065_driver);

	MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");
	MODULE_DESCRIPTION("MAX16065 driver");
	MODULE_LICENSE("GPL");