drivers/hwmon/max6697.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
  *
  * based on max1668.c
  * Copyright (c) 2011 David George <david.george@ska.ac.za>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #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.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_MAP_BITS(reg)	((((reg) & 0x7e) >> 1) | \
 				 (((reg) & 0x01) << 6) | ((reg) & 0x80))

 #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 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 device *hwmon_dev;

 	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 struct max6697_data *max6697_update_device(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct max6697_data *data = i2c_get_clientdata(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 show_temp_input(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\n", temp * 125);
 }

 static ssize_t show_temp(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\n", temp * 1000);
 }

 static ssize_t show_alarm(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\n", (data->alarms >> index) & 0x1);
 }

 static ssize_t set_temp(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 i2c_client *client = to_i2c_client(dev);
 	struct max6697_data *data = i2c_get_clientdata(client);
 	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(client,
 					index == 2 ? MAX6697_REG_MAX[nr]
 						   : MAX6697_REG_CRIT[nr],
 					temp);
 	mutex_unlock(&data->update_lock);

 	return ret < 0 ? ret : count;
 }

 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
 static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    0, MAX6697_TEMP_MAX);
 static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    0, MAX6697_TEMP_CRIT);

 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
 static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    1, MAX6697_TEMP_MAX);
 static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    1, MAX6697_TEMP_CRIT);

 static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
 static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    2, MAX6697_TEMP_MAX);
 static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    2, MAX6697_TEMP_CRIT);

 static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
 static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    3, MAX6697_TEMP_MAX);
 static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    3, MAX6697_TEMP_CRIT);

 static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
 static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    4, MAX6697_TEMP_MAX);
 static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    4, MAX6697_TEMP_CRIT);

 static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
 static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    5, MAX6697_TEMP_MAX);
 static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    5, MAX6697_TEMP_CRIT);

 static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6);
 static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    6, MAX6697_TEMP_MAX);
 static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    6, MAX6697_TEMP_CRIT);

 static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7);
 static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    7, MAX6697_TEMP_MAX);
 static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO | S_IWUSR, show_temp, set_temp,
 			    7, MAX6697_TEMP_CRIT);

 static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22);
 static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16);
 static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17);
 static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18);
 static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19);
 static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20);
 static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21);
 static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23);

 static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14);
 static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
 static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
 static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10);
 static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11);
 static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12);
 static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
 static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15);

 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1);
 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
 static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3);
 static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4);
 static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5);
 static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6);
 static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7);

 static struct attribute *max6697_attributes[8][7] = {
 	{
 		&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,
 		NULL
 	}, {
 		&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,
 		NULL
 	}, {
 		&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,
 		NULL
 	}, {
 		&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,
 		NULL
 	}, {
 		&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,
 		NULL
 	}, {
 		&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,
 		NULL
 	}, {
 		&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,
 		NULL
 	}, {
 		&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,
 		NULL
 	}
 };

 static const struct attribute_group max6697_group[8] = {
 	{ .attrs = max6697_attributes[0] },
 	{ .attrs = max6697_attributes[1] },
 	{ .attrs = max6697_attributes[2] },
 	{ .attrs = max6697_attributes[3] },
 	{ .attrs = max6697_attributes[4] },
 	{ .attrs = max6697_attributes[5] },
 	{ .attrs = max6697_attributes[6] },
 	{ .attrs = max6697_attributes[7] },
 };

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

 	prop = of_get_property(node, "smbus-timeout-disable", &len);
 	if (prop)
 		pdata->smbus_timeout_disable = true;
 	prop = of_get_property(node, "extended-range-enable", &len);
 	if (prop)
 		pdata->extended_range_enable = true;
 	prop = of_get_property(node, "beta-compensation-enable", &len);
 	if (prop)
 		pdata->beta_compensation = true;
 	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 i2c_client *client)
 {
 	struct max6697_data *data = i2c_get_clientdata(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_MAP_BITS(pdata->alert_mask));
 	if (ret < 0)
 		return ret;

 	ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
 				MAX6697_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_mask >> 1);
 		if (ret < 0)
 			return ret;
 		ret = i2c_smbus_write_byte_data(client,
 						MAX6581_REG_IDEALITY_SELECT,
 						pdata->ideality_value);
 		if (ret < 0)
 			return ret;
 	}
 done:
 	data->update_interval = factor * MAX6697_CONV_TIME;
 	return 0;
 }

 static void max6697_remove_files(struct i2c_client *client)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(max6697_group); i++)
 		sysfs_remove_group(&client->dev.kobj, &max6697_group[i]);
 }

 static int max6697_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct i2c_adapter *adapter = client->adapter;
 	struct device *dev = &client->dev;
 	struct max6697_data *data;
 	int i, 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;

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

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

 	err = max6697_init_chip(client);
 	if (err)
 		return err;

 	for (i = 0; i < data->chip->channels; i++) {
 		err = sysfs_create_file(&dev->kobj,
 					max6697_attributes[i][0]);
 		if (err)
 			goto error;
 		err = sysfs_create_file(&dev->kobj,
 					max6697_attributes[i][1]);
 		if (err)
 			goto error;
 		err = sysfs_create_file(&dev->kobj,
 					max6697_attributes[i][2]);
 		if (err)
 			goto error;

 		if (data->chip->have_crit & (1 << i)) {
 			err = sysfs_create_file(&dev->kobj,
 						max6697_attributes[i][3]);
 			if (err)
 				goto error;
 			err = sysfs_create_file(&dev->kobj,
 						max6697_attributes[i][4]);
 			if (err)
 				goto error;
 		}
 		if (data->chip->have_fault & (1 << i)) {
 			err = sysfs_create_file(&dev->kobj,
 						max6697_attributes[i][5]);
 			if (err)
 				goto error;
 		}
 	}

 	data->hwmon_dev = hwmon_device_register(dev);
 	if (IS_ERR(data->hwmon_dev)) {
 		err = PTR_ERR(data->hwmon_dev);
 		goto error;
 	}

 	return 0;

 error:
 	max6697_remove_files(client);
 	return err;
 }

 static int max6697_remove(struct i2c_client *client)
 {
 	struct max6697_data *data = i2c_get_clientdata(client);

 	hwmon_device_unregister(data->hwmon_dev);
 	max6697_remove_files(client);

 	return 0;
 }

 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 struct i2c_driver max6697_driver = {
 	.class = I2C_CLASS_HWMON,
 	.driver = {
 		.name	= "max6697",
 	},
 	.probe = max6697_probe,
 	.remove	= max6697_remove,
 	.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");
	/*
	* Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net>
	*
	* based on max1668.c
	* Copyright (c) 2011 David George <david.george@ska.ac.za>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#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.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_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) \| \
	(((reg) & 0x01) << 6) \| ((reg) & 0x80))

	#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 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 device *hwmon_dev;

	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 struct max6697_data max6697_update_device(struct device dev)
	{
	struct i2c_client *client = to_i2c_client(dev);
	struct max6697_data *data = i2c_get_clientdata(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 show_temp_input(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\n", temp * 125);
	}

	static ssize_t show_temp(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\n", temp * 1000);
	}

	static ssize_t show_alarm(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\n", (data->alarms >> index) & 0x1);
	}

	static ssize_t set_temp(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 i2c_client *client = to_i2c_client(dev);
	struct max6697_data *data = i2c_get_clientdata(client);
	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(client,
	index == 2 ? MAX6697_REG_MAX[nr]
	: MAX6697_REG_CRIT[nr],
	temp);
	mutex_unlock(&data->update_lock);

	return ret < 0 ? ret : count;
	}

	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input, NULL, 0);
	static SENSOR_DEVICE_ATTR_2(temp1_max, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	0, MAX6697_TEMP_MAX);
	static SENSOR_DEVICE_ATTR_2(temp1_crit, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	0, MAX6697_TEMP_CRIT);

	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp_input, NULL, 1);
	static SENSOR_DEVICE_ATTR_2(temp2_max, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	1, MAX6697_TEMP_MAX);
	static SENSOR_DEVICE_ATTR_2(temp2_crit, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	1, MAX6697_TEMP_CRIT);

	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp_input, NULL, 2);
	static SENSOR_DEVICE_ATTR_2(temp3_max, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	2, MAX6697_TEMP_MAX);
	static SENSOR_DEVICE_ATTR_2(temp3_crit, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	2, MAX6697_TEMP_CRIT);

	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp_input, NULL, 3);
	static SENSOR_DEVICE_ATTR_2(temp4_max, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	3, MAX6697_TEMP_MAX);
	static SENSOR_DEVICE_ATTR_2(temp4_crit, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	3, MAX6697_TEMP_CRIT);

	static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp_input, NULL, 4);
	static SENSOR_DEVICE_ATTR_2(temp5_max, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	4, MAX6697_TEMP_MAX);
	static SENSOR_DEVICE_ATTR_2(temp5_crit, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	4, MAX6697_TEMP_CRIT);

	static SENSOR_DEVICE_ATTR(temp6_input, S_IRUGO, show_temp_input, NULL, 5);
	static SENSOR_DEVICE_ATTR_2(temp6_max, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	5, MAX6697_TEMP_MAX);
	static SENSOR_DEVICE_ATTR_2(temp6_crit, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	5, MAX6697_TEMP_CRIT);

	static SENSOR_DEVICE_ATTR(temp7_input, S_IRUGO, show_temp_input, NULL, 6);
	static SENSOR_DEVICE_ATTR_2(temp7_max, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	6, MAX6697_TEMP_MAX);
	static SENSOR_DEVICE_ATTR_2(temp7_crit, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	6, MAX6697_TEMP_CRIT);

	static SENSOR_DEVICE_ATTR(temp8_input, S_IRUGO, show_temp_input, NULL, 7);
	static SENSOR_DEVICE_ATTR_2(temp8_max, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	7, MAX6697_TEMP_MAX);
	static SENSOR_DEVICE_ATTR_2(temp8_crit, S_IRUGO \| S_IWUSR, show_temp, set_temp,
	7, MAX6697_TEMP_CRIT);

	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 22);
	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 16);
	static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 17);
	static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 18);
	static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 19);
	static SENSOR_DEVICE_ATTR(temp6_max_alarm, S_IRUGO, show_alarm, NULL, 20);
	static SENSOR_DEVICE_ATTR(temp7_max_alarm, S_IRUGO, show_alarm, NULL, 21);
	static SENSOR_DEVICE_ATTR(temp8_max_alarm, S_IRUGO, show_alarm, NULL, 23);

	static SENSOR_DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL, 14);
	static SENSOR_DEVICE_ATTR(temp2_crit_alarm, S_IRUGO, show_alarm, NULL, 8);
	static SENSOR_DEVICE_ATTR(temp3_crit_alarm, S_IRUGO, show_alarm, NULL, 9);
	static SENSOR_DEVICE_ATTR(temp4_crit_alarm, S_IRUGO, show_alarm, NULL, 10);
	static SENSOR_DEVICE_ATTR(temp5_crit_alarm, S_IRUGO, show_alarm, NULL, 11);
	static SENSOR_DEVICE_ATTR(temp6_crit_alarm, S_IRUGO, show_alarm, NULL, 12);
	static SENSOR_DEVICE_ATTR(temp7_crit_alarm, S_IRUGO, show_alarm, NULL, 13);
	static SENSOR_DEVICE_ATTR(temp8_crit_alarm, S_IRUGO, show_alarm, NULL, 15);

	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 1);
	static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 2);
	static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_alarm, NULL, 3);
	static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_alarm, NULL, 4);
	static SENSOR_DEVICE_ATTR(temp6_fault, S_IRUGO, show_alarm, NULL, 5);
	static SENSOR_DEVICE_ATTR(temp7_fault, S_IRUGO, show_alarm, NULL, 6);
	static SENSOR_DEVICE_ATTR(temp8_fault, S_IRUGO, show_alarm, NULL, 7);

	static struct attribute *max6697_attributes[8][7] = {
	{
	&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,
	NULL
	}, {
	&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,
	NULL
	}, {
	&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,
	NULL
	}, {
	&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,
	NULL
	}, {
	&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,
	NULL
	}, {
	&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,
	NULL
	}, {
	&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,
	NULL
	}, {
	&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,
	NULL
	}
	};

	static const struct attribute_group max6697_group[8] = {
	{ .attrs = max6697_attributes[0] },
	{ .attrs = max6697_attributes[1] },
	{ .attrs = max6697_attributes[2] },
	{ .attrs = max6697_attributes[3] },
	{ .attrs = max6697_attributes[4] },
	{ .attrs = max6697_attributes[5] },
	{ .attrs = max6697_attributes[6] },
	{ .attrs = max6697_attributes[7] },
	};

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

	prop = of_get_property(node, "smbus-timeout-disable", &len);
	if (prop)
	pdata->smbus_timeout_disable = true;
	prop = of_get_property(node, "extended-range-enable", &len);
	if (prop)
	pdata->extended_range_enable = true;
	prop = of_get_property(node, "beta-compensation-enable", &len);
	if (prop)
	pdata->beta_compensation = true;
	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 i2c_client *client)
	{
	struct max6697_data *data = i2c_get_clientdata(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_MAP_BITS(pdata->alert_mask));
	if (ret < 0)
	return ret;

	ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK,
	MAX6697_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_mask >> 1);
	if (ret < 0)
	return ret;
	ret = i2c_smbus_write_byte_data(client,
	MAX6581_REG_IDEALITY_SELECT,
	pdata->ideality_value);
	if (ret < 0)
	return ret;
	}
	done:
	data->update_interval = factor * MAX6697_CONV_TIME;
	return 0;
	}

	static void max6697_remove_files(struct i2c_client *client)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(max6697_group); i++)
	sysfs_remove_group(&client->dev.kobj, &max6697_group[i]);
	}

	static int max6697_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct i2c_adapter *adapter = client->adapter;
	struct device *dev = &client->dev;
	struct max6697_data *data;
	int i, 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;

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

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

	err = max6697_init_chip(client);
	if (err)
	return err;

	for (i = 0; i < data->chip->channels; i++) {
	err = sysfs_create_file(&dev->kobj,
	max6697_attributes[i][0]);
	if (err)
	goto error;
	err = sysfs_create_file(&dev->kobj,
	max6697_attributes[i][1]);
	if (err)
	goto error;
	err = sysfs_create_file(&dev->kobj,
	max6697_attributes[i][2]);
	if (err)
	goto error;

	if (data->chip->have_crit & (1 << i)) {
	err = sysfs_create_file(&dev->kobj,
	max6697_attributes[i][3]);
	if (err)
	goto error;
	err = sysfs_create_file(&dev->kobj,
	max6697_attributes[i][4]);
	if (err)
	goto error;
	}
	if (data->chip->have_fault & (1 << i)) {
	err = sysfs_create_file(&dev->kobj,
	max6697_attributes[i][5]);
	if (err)
	goto error;
	}
	}

	data->hwmon_dev = hwmon_device_register(dev);
	if (IS_ERR(data->hwmon_dev)) {
	err = PTR_ERR(data->hwmon_dev);
	goto error;
	}

	return 0;

	error:
	max6697_remove_files(client);
	return err;
	}

	static int max6697_remove(struct i2c_client *client)
	{
	struct max6697_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	max6697_remove_files(client);

	return 0;
	}

	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 struct i2c_driver max6697_driver = {
	.class = I2C_CLASS_HWMON,
	.driver = {
	.name = "max6697",
	},
	.probe = max6697_probe,
	.remove = max6697_remove,
	.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");