[mirror_ubuntu-bionic-kernel.git] / drivers / hwmon / max1668.c

/*
 * Copyright (c) 2011 David George <david.george@ska.ac.za>
 *
 * based on adm1021.c
 * some credit to Christoph Scheurer, but largely a rewrite
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/i2c.h>
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
#include <linux/err.h>
#include <linux/mutex.h>

/* Addresses to scan */
static const unsigned short max1668_addr_list[] = {
	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };

/* max1668 registers */

#define MAX1668_REG_TEMP(nr)	(nr)
#define MAX1668_REG_STAT1	0x05
#define MAX1668_REG_STAT2	0x06
#define MAX1668_REG_MAN_ID	0xfe
#define MAX1668_REG_DEV_ID	0xff

/* limits */

/* write high limits */
#define MAX1668_REG_LIMH_WR(nr)	(0x13 + 2 * (nr))
/* write low limits */
#define MAX1668_REG_LIML_WR(nr)	(0x14 + 2 * (nr))
/* read high limits */
#define MAX1668_REG_LIMH_RD(nr)	(0x08 + 2 * (nr))
/* read low limits */
#define MAX1668_REG_LIML_RD(nr)	(0x09 + 2 * (nr))

/* manufacturer and device ID Constants */
#define MAN_ID_MAXIM		0x4d
#define DEV_ID_MAX1668		0x3
#define DEV_ID_MAX1805		0x5
#define DEV_ID_MAX1989		0xb

/* read only mode module parameter */
static bool read_only;
module_param(read_only, bool, 0);
MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");

enum chips { max1668, max1805, max1989 };

struct max1668_data {
	struct i2c_client *client;
	const struct attribute_group *groups[3];
	enum chips type;

	struct mutex update_lock;
	char valid;		/* !=0 if following fields are valid */
	unsigned long last_updated;	/* In jiffies */

	/* 1x local and 4x remote */
	s8 temp_max[5];
	s8 temp_min[5];
	s8 temp[5];
	u16 alarms;
};

static struct max1668_data *max1668_update_device(struct device *dev)
{
	struct max1668_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	struct max1668_data *ret = data;
	s32 val;
	int i;

	mutex_lock(&data->update_lock);

	if (data->valid && !time_after(jiffies,
			data->last_updated + HZ + HZ / 2))
		goto abort;

	for (i = 0; i < 5; i++) {
		val = i2c_smbus_read_byte_data(client, MAX1668_REG_TEMP(i));
		if (unlikely(val < 0)) {
			ret = ERR_PTR(val);
			goto abort;
		}
		data->temp[i] = (s8) val;

		val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIMH_RD(i));
		if (unlikely(val < 0)) {
			ret = ERR_PTR(val);
			goto abort;
		}
		data->temp_max[i] = (s8) val;

		val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIML_RD(i));
		if (unlikely(val < 0)) {
			ret = ERR_PTR(val);
			goto abort;
		}
		data->temp_min[i] = (s8) val;
	}

	val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT1);
	if (unlikely(val < 0)) {
		ret = ERR_PTR(val);
		goto abort;
	}
	data->alarms = val << 8;

	val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT2);
	if (unlikely(val < 0)) {
		ret = ERR_PTR(val);
		goto abort;
	}
	data->alarms |= val;

	data->last_updated = jiffies;
	data->valid = 1;
abort:
	mutex_unlock(&data->update_lock);

	return ret;
}

static ssize_t show_temp(struct device *dev,
			 struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct max1668_data *data = max1668_update_device(dev);

	if (IS_ERR(data))
		return PTR_ERR(data);

	return sprintf(buf, "%d\n", data->temp[index] * 1000);
}

static ssize_t show_temp_max(struct device *dev,
			     struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct max1668_data *data = max1668_update_device(dev);

	if (IS_ERR(data))
		return PTR_ERR(data);

	return sprintf(buf, "%d\n", data->temp_max[index] * 1000);
}

static ssize_t show_temp_min(struct device *dev,
			     struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct max1668_data *data = max1668_update_device(dev);

	if (IS_ERR(data))
		return PTR_ERR(data);

	return sprintf(buf, "%d\n", data->temp_min[index] * 1000);
}

static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
			  char *buf)
{
	int index = to_sensor_dev_attr(attr)->index;
	struct max1668_data *data = max1668_update_device(dev);

	if (IS_ERR(data))
		return PTR_ERR(data);

	return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
}

static ssize_t show_fault(struct device *dev,
			  struct device_attribute *devattr, char *buf)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct max1668_data *data = max1668_update_device(dev);

	if (IS_ERR(data))
		return PTR_ERR(data);

	return sprintf(buf, "%u\n",
		       (data->alarms & (1 << 12)) && data->temp[index] == 127);
}

static ssize_t set_temp_max(struct device *dev,
			    struct device_attribute *devattr,
			    const char *buf, size_t count)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct max1668_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	long temp;
	int ret;

	ret = kstrtol(buf, 10, &temp);
	if (ret < 0)
		return ret;

	mutex_lock(&data->update_lock);
	data->temp_max[index] = clamp_val(temp/1000, -128, 127);
	ret = i2c_smbus_write_byte_data(client,
					MAX1668_REG_LIMH_WR(index),
					data->temp_max[index]);
	if (ret < 0)
		count = ret;
	mutex_unlock(&data->update_lock);

	return count;
}

static ssize_t set_temp_min(struct device *dev,
			    struct device_attribute *devattr,
			    const char *buf, size_t count)
{
	int index = to_sensor_dev_attr(devattr)->index;
	struct max1668_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	long temp;
	int ret;

	ret = kstrtol(buf, 10, &temp);
	if (ret < 0)
		return ret;

	mutex_lock(&data->update_lock);
	data->temp_min[index] = clamp_val(temp/1000, -128, 127);
	ret = i2c_smbus_write_byte_data(client,
					MAX1668_REG_LIML_WR(index),
					data->temp_min[index]);
	if (ret < 0)
		count = ret;
	mutex_unlock(&data->update_lock);

	return count;
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max,
				set_temp_max, 0);
static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp_min,
				set_temp_min, 0);
static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max,
				set_temp_max, 1);
static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min,
				set_temp_min, 1);
static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max,
				set_temp_max, 2);
static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min,
				set_temp_min, 2);
static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max,
				set_temp_max, 3);
static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min,
				set_temp_min, 3);
static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max,
				set_temp_max, 4);
static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min,
				set_temp_min, 4);

static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 14);
static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 13);
static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 7);
static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 6);
static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 5);
static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_alarm, NULL, 3);
static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 2);
static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO, show_alarm, NULL, 1);
static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 0);

static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_fault, NULL, 1);
static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_fault, NULL, 2);
static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_fault, NULL, 3);
static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_fault, NULL, 4);

/* Attributes common to MAX1668, MAX1989 and MAX1805 */
static struct attribute *max1668_attribute_common[] = {
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_min.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_temp2_max.dev_attr.attr,
	&sensor_dev_attr_temp2_min.dev_attr.attr,
	&sensor_dev_attr_temp2_input.dev_attr.attr,
	&sensor_dev_attr_temp3_max.dev_attr.attr,
	&sensor_dev_attr_temp3_min.dev_attr.attr,
	&sensor_dev_attr_temp3_input.dev_attr.attr,

	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,

	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	&sensor_dev_attr_temp3_fault.dev_attr.attr,
	NULL
};

/* Attributes not present on MAX1805 */
static struct attribute *max1668_attribute_unique[] = {
	&sensor_dev_attr_temp4_max.dev_attr.attr,
	&sensor_dev_attr_temp4_min.dev_attr.attr,
	&sensor_dev_attr_temp4_input.dev_attr.attr,
	&sensor_dev_attr_temp5_max.dev_attr.attr,
	&sensor_dev_attr_temp5_min.dev_attr.attr,
	&sensor_dev_attr_temp5_input.dev_attr.attr,

	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
	&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
	&sensor_dev_attr_temp5_min_alarm.dev_attr.attr,

	&sensor_dev_attr_temp4_fault.dev_attr.attr,
	&sensor_dev_attr_temp5_fault.dev_attr.attr,
	NULL
};

static umode_t max1668_attribute_mode(struct kobject *kobj,
				     struct attribute *attr, int index)
{
	umode_t ret = S_IRUGO;
	if (read_only)
		return ret;
	if (attr == &sensor_dev_attr_temp1_max.dev_attr.attr ||
	    attr == &sensor_dev_attr_temp2_max.dev_attr.attr ||
	    attr == &sensor_dev_attr_temp3_max.dev_attr.attr ||
	    attr == &sensor_dev_attr_temp4_max.dev_attr.attr ||
	    attr == &sensor_dev_attr_temp5_max.dev_attr.attr ||
	    attr == &sensor_dev_attr_temp1_min.dev_attr.attr ||
	    attr == &sensor_dev_attr_temp2_min.dev_attr.attr ||
	    attr == &sensor_dev_attr_temp3_min.dev_attr.attr ||
	    attr == &sensor_dev_attr_temp4_min.dev_attr.attr ||
	    attr == &sensor_dev_attr_temp5_min.dev_attr.attr)
		ret |= S_IWUSR;
	return ret;
}

static const struct attribute_group max1668_group_common = {
	.attrs = max1668_attribute_common,
	.is_visible = max1668_attribute_mode
};

static const struct attribute_group max1668_group_unique = {
	.attrs = max1668_attribute_unique,
	.is_visible = max1668_attribute_mode
};

/* Return 0 if detection is successful, -ENODEV otherwise */
static int max1668_detect(struct i2c_client *client,
			  struct i2c_board_info *info)
{
	struct i2c_adapter *adapter = client->adapter;
	const char *type_name;
	int man_id, dev_id;

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

	/* Check for unsupported part */
	man_id = i2c_smbus_read_byte_data(client, MAX1668_REG_MAN_ID);
	if (man_id != MAN_ID_MAXIM)
		return -ENODEV;

	dev_id = i2c_smbus_read_byte_data(client, MAX1668_REG_DEV_ID);
	if (dev_id < 0)
		return -ENODEV;

	type_name = NULL;
	if (dev_id == DEV_ID_MAX1668)
		type_name = "max1668";
	else if (dev_id == DEV_ID_MAX1805)
		type_name = "max1805";
	else if (dev_id == DEV_ID_MAX1989)
		type_name = "max1989";

	if (!type_name)
		return -ENODEV;

	strlcpy(info->type, type_name, I2C_NAME_SIZE);

	return 0;
}

static int max1668_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct i2c_adapter *adapter = client->adapter;
	struct device *dev = &client->dev;
	struct device *hwmon_dev;
	struct max1668_data *data;

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

	data = devm_kzalloc(dev, sizeof(struct max1668_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->client = client;
	data->type = id->driver_data;
	mutex_init(&data->update_lock);

	/* sysfs hooks */
	data->groups[0] = &max1668_group_common;
	if (data->type == max1668 || data->type == max1989)
		data->groups[1] = &max1668_group_unique;

	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 max1668_id[] = {
	{ "max1668", max1668 },
	{ "max1805", max1805 },
	{ "max1989", max1989 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, max1668_id);

/* This is the driver that will be inserted */
static struct i2c_driver max1668_driver = {
	.class = I2C_CLASS_HWMON,
	.driver = {
		  .name	= "max1668",
		  },
	.probe = max1668_probe,
	.id_table = max1668_id,
	.detect	= max1668_detect,
	.address_list = max1668_addr_list,
};

module_i2c_driver(max1668_driver);

MODULE_AUTHOR("David George <david.george@ska.ac.za>");
MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
731b4cac	1	/*
b6707b78 GR	2	* Copyright (c) 2011 David George <david.george@ska.ac.za>
	3	*
	4	* based on adm1021.c
	5	* some credit to Christoph Scheurer, but largely a rewrite
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	20	*/
731b4cac DG	21
	22	#include <linux/module.h>
	23	#include <linux/init.h>
	24	#include <linux/slab.h>
	25	#include <linux/jiffies.h>
	26	#include <linux/i2c.h>
	27	#include <linux/hwmon.h>
	28	#include <linux/hwmon-sysfs.h>
	29	#include <linux/err.h>
	30	#include <linux/mutex.h>
	31
	32	/* Addresses to scan */
28681d71	33	static const unsigned short max1668_addr_list[] = {
731b4cac DG	34	0x18, 0x19, 0x1a, 0x29, 0x2a, 0x2b, 0x4c, 0x4d, 0x4e, I2C_CLIENT_END };
	35
	36	/* max1668 registers */
	37
	38	#define MAX1668_REG_TEMP(nr) (nr)
	39	#define MAX1668_REG_STAT1 0x05
	40	#define MAX1668_REG_STAT2 0x06
	41	#define MAX1668_REG_MAN_ID 0xfe
	42	#define MAX1668_REG_DEV_ID 0xff
	43
	44	/* limits */
	45
	46	/* write high limits */
	47	#define MAX1668_REG_LIMH_WR(nr) (0x13 + 2 * (nr))
	48	/* write low limits */
	49	#define MAX1668_REG_LIML_WR(nr) (0x14 + 2 * (nr))
	50	/* read high limits */
	51	#define MAX1668_REG_LIMH_RD(nr) (0x08 + 2 * (nr))
	52	/* read low limits */
	53	#define MAX1668_REG_LIML_RD(nr) (0x09 + 2 * (nr))
	54
	55	/* manufacturer and device ID Constants */
	56	#define MAN_ID_MAXIM 0x4d
	57	#define DEV_ID_MAX1668 0x3
	58	#define DEV_ID_MAX1805 0x5
	59	#define DEV_ID_MAX1989 0xb
	60
	61	/* read only mode module parameter */
90ab5ee9	62	static bool read_only;
731b4cac DG	63	module_param(read_only, bool, 0);
	64	MODULE_PARM_DESC(read_only, "Don't set any values, read only mode");
	65
	66	enum chips { max1668, max1805, max1989 };
	67
	68	struct max1668_data {
5230551a GR	69	struct i2c_client *client;
5230551a GR	70	const struct attribute_group *groups[3];
731b4cac DG	71	enum chips type;
	72
	73	struct mutex update_lock;
	74	char valid; /* !=0 if following fields are valid */
	75	unsigned long last_updated; /* In jiffies */
	76
	77	/* 1x local and 4x remote */
	78	s8 temp_max[5];
	79	s8 temp_min[5];
	80	s8 temp[5];
	81	u16 alarms;
	82	};
	83
	84	static struct max1668_data max1668_update_device(struct device dev)
	85	{
5230551a GR	86	struct max1668_data *data = dev_get_drvdata(dev);
5230551a GR	87	struct i2c_client *client = data->client;
731b4cac DG	88	struct max1668_data *ret = data;
	89	s32 val;
	90	int i;
	91
	92	mutex_lock(&data->update_lock);
	93
	94	if (data->valid && !time_after(jiffies,
	95	data->last_updated + HZ + HZ / 2))
	96	goto abort;
	97
	98	for (i = 0; i < 5; i++) {
	99	val = i2c_smbus_read_byte_data(client, MAX1668_REG_TEMP(i));
	100	if (unlikely(val < 0)) {
	101	ret = ERR_PTR(val);
	102	goto abort;
	103	}
	104	data->temp[i] = (s8) val;
	105
	106	val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIMH_RD(i));
	107	if (unlikely(val < 0)) {
	108	ret = ERR_PTR(val);
	109	goto abort;
	110	}
	111	data->temp_max[i] = (s8) val;
	112
	113	val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIML_RD(i));
	114	if (unlikely(val < 0)) {
	115	ret = ERR_PTR(val);
	116	goto abort;
	117	}
	118	data->temp_min[i] = (s8) val;
	119	}
	120
	121	val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT1);
	122	if (unlikely(val < 0)) {
	123	ret = ERR_PTR(val);
	124	goto abort;
	125	}
dabaa0d2	126	data->alarms = val << 8;
731b4cac DG	127
	128	val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT2);
	129	if (unlikely(val < 0)) {
	130	ret = ERR_PTR(val);
	131	goto abort;
	132	}
dabaa0d2	133	data->alarms \|= val;
731b4cac DG	134
	135	data->last_updated = jiffies;
	136	data->valid = 1;
	137	abort:
	138	mutex_unlock(&data->update_lock);
	139
	140	return ret;
	141	}
	142
	143	static ssize_t show_temp(struct device *dev,
	144	struct device_attribute devattr, char buf)
	145	{
	146	int index = to_sensor_dev_attr(devattr)->index;
	147	struct max1668_data *data = max1668_update_device(dev);
	148
	149	if (IS_ERR(data))
	150	return PTR_ERR(data);
	151
	152	return sprintf(buf, "%d\n", data->temp[index] * 1000);
	153	}
	154
	155	static ssize_t show_temp_max(struct device *dev,
	156	struct device_attribute devattr, char buf)
	157	{
	158	int index = to_sensor_dev_attr(devattr)->index;
	159	struct max1668_data *data = max1668_update_device(dev);
	160
	161	if (IS_ERR(data))
	162	return PTR_ERR(data);
	163
	164	return sprintf(buf, "%d\n", data->temp_max[index] * 1000);
	165	}
	166
	167	static ssize_t show_temp_min(struct device *dev,
	168	struct device_attribute devattr, char buf)
	169	{
	170	int index = to_sensor_dev_attr(devattr)->index;
	171	struct max1668_data *data = max1668_update_device(dev);
	172
	173	if (IS_ERR(data))
	174	return PTR_ERR(data);
	175
	176	return sprintf(buf, "%d\n", data->temp_min[index] * 1000);
	177	}
	178
	179	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	180	char *buf)
	181	{
	182	int index = to_sensor_dev_attr(attr)->index;
	183	struct max1668_data *data = max1668_update_device(dev);
	184
	185	if (IS_ERR(data))
	186	return PTR_ERR(data);
	187
	188	return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
	189	}
	190
dabaa0d2 GR	191	static ssize_t show_fault(struct device *dev,
	192	struct device_attribute devattr, char buf)
	193	{
	194	int index = to_sensor_dev_attr(devattr)->index;
	195	struct max1668_data *data = max1668_update_device(dev);
	196
	197	if (IS_ERR(data))
	198	return PTR_ERR(data);
	199
	200	return sprintf(buf, "%u\n",
	201	(data->alarms & (1 << 12)) && data->temp[index] == 127);
	202	}
	203
731b4cac DG	204	static ssize_t set_temp_max(struct device *dev,
	205	struct device_attribute *devattr,
	206	const char *buf, size_t count)
	207	{
	208	int index = to_sensor_dev_attr(devattr)->index;
5230551a GR	209	struct max1668_data *data = dev_get_drvdata(dev);
5230551a GR	210	struct i2c_client *client = data->client;
731b4cac DG	211	long temp;
	212	int ret;
	213
	214	ret = kstrtol(buf, 10, &temp);
	215	if (ret < 0)
	216	return ret;
	217
	218	mutex_lock(&data->update_lock);
2a844c14	219	data->temp_max[index] = clamp_val(temp/1000, -128, 127);
c5a70669	220	ret = i2c_smbus_write_byte_data(client,
731b4cac	221	MAX1668_REG_LIMH_WR(index),
c5a70669 GR	222	data->temp_max[index]);
	223	if (ret < 0)
	224	count = ret;
731b4cac DG	225	mutex_unlock(&data->update_lock);
	226
	227	return count;
	228	}
	229
	230	static ssize_t set_temp_min(struct device *dev,
	231	struct device_attribute *devattr,
	232	const char *buf, size_t count)
	233	{
	234	int index = to_sensor_dev_attr(devattr)->index;
5230551a GR	235	struct max1668_data *data = dev_get_drvdata(dev);
5230551a GR	236	struct i2c_client *client = data->client;
731b4cac DG	237	long temp;
	238	int ret;
	239
	240	ret = kstrtol(buf, 10, &temp);
	241	if (ret < 0)
	242	return ret;
	243
	244	mutex_lock(&data->update_lock);
2a844c14	245	data->temp_min[index] = clamp_val(temp/1000, -128, 127);
c5a70669	246	ret = i2c_smbus_write_byte_data(client,
731b4cac	247	MAX1668_REG_LIML_WR(index),
c5a70669 GR	248	data->temp_min[index]);
	249	if (ret < 0)
	250	count = ret;
731b4cac DG	251	mutex_unlock(&data->update_lock);
	252
	253	return count;
	254	}
	255
	256	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	257	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max,
	258	set_temp_max, 0);
	259	static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp_min,
	260	set_temp_min, 0);
	261	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	262	static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max,
	263	set_temp_max, 1);
	264	static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min,
	265	set_temp_min, 1);
	266	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	267	static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max,
	268	set_temp_max, 2);
	269	static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min,
	270	set_temp_min, 2);
	271	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
	272	static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max,
	273	set_temp_max, 3);
	274	static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min,
	275	set_temp_min, 3);
	276	static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
	277	static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max,
	278	set_temp_max, 4);
	279	static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min,
	280	set_temp_min, 4);
	281
	282	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 14);
	283	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 13);
	284	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 7);
	285	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	286	static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 5);
	287	static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	288	static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	289	static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 2);
	290	static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO, show_alarm, NULL, 1);
	291	static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 0);
	292
dabaa0d2 GR	293	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_fault, NULL, 1);
	294	static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_fault, NULL, 2);
	295	static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_fault, NULL, 3);
	296	static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_fault, NULL, 4);
	297
731b4cac DG	298	/* Attributes common to MAX1668, MAX1989 and MAX1805 */
	299	static struct attribute *max1668_attribute_common[] = {
	300	&sensor_dev_attr_temp1_max.dev_attr.attr,
	301	&sensor_dev_attr_temp1_min.dev_attr.attr,
	302	&sensor_dev_attr_temp1_input.dev_attr.attr,
	303	&sensor_dev_attr_temp2_max.dev_attr.attr,
	304	&sensor_dev_attr_temp2_min.dev_attr.attr,
	305	&sensor_dev_attr_temp2_input.dev_attr.attr,
	306	&sensor_dev_attr_temp3_max.dev_attr.attr,
	307	&sensor_dev_attr_temp3_min.dev_attr.attr,
	308	&sensor_dev_attr_temp3_input.dev_attr.attr,
	309
	310	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	311	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	312	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	313	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	314	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	315	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
dabaa0d2 GR	316
	317	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	318	&sensor_dev_attr_temp3_fault.dev_attr.attr,
731b4cac DG	319	NULL
	320	};
	321
	322	/* Attributes not present on MAX1805 */
	323	static struct attribute *max1668_attribute_unique[] = {
	324	&sensor_dev_attr_temp4_max.dev_attr.attr,
	325	&sensor_dev_attr_temp4_min.dev_attr.attr,
	326	&sensor_dev_attr_temp4_input.dev_attr.attr,
	327	&sensor_dev_attr_temp5_max.dev_attr.attr,
	328	&sensor_dev_attr_temp5_min.dev_attr.attr,
	329	&sensor_dev_attr_temp5_input.dev_attr.attr,
	330
	331	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	332	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
	333	&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
	334	&sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
dabaa0d2 GR	335
	336	&sensor_dev_attr_temp4_fault.dev_attr.attr,
	337	&sensor_dev_attr_temp5_fault.dev_attr.attr,
731b4cac DG	338	NULL
	339	};
	340
587a1f16	341	static umode_t max1668_attribute_mode(struct kobject *kobj,
731b4cac DG	342	struct attribute *attr, int index)
731b4cac DG	343	{
587a1f16	344	umode_t ret = S_IRUGO;
731b4cac DG	345	if (read_only)
	346	return ret;
	347	if (attr == &sensor_dev_attr_temp1_max.dev_attr.attr \|\|
	348	attr == &sensor_dev_attr_temp2_max.dev_attr.attr \|\|
	349	attr == &sensor_dev_attr_temp3_max.dev_attr.attr \|\|
	350	attr == &sensor_dev_attr_temp4_max.dev_attr.attr \|\|
	351	attr == &sensor_dev_attr_temp5_max.dev_attr.attr \|\|
	352	attr == &sensor_dev_attr_temp1_min.dev_attr.attr \|\|
	353	attr == &sensor_dev_attr_temp2_min.dev_attr.attr \|\|
	354	attr == &sensor_dev_attr_temp3_min.dev_attr.attr \|\|
	355	attr == &sensor_dev_attr_temp4_min.dev_attr.attr \|\|
	356	attr == &sensor_dev_attr_temp5_min.dev_attr.attr)
	357	ret \|= S_IWUSR;
	358	return ret;
	359	}
	360
	361	static const struct attribute_group max1668_group_common = {
	362	.attrs = max1668_attribute_common,
	363	.is_visible = max1668_attribute_mode
	364	};
	365
	366	static const struct attribute_group max1668_group_unique = {
	367	.attrs = max1668_attribute_unique,
	368	.is_visible = max1668_attribute_mode
	369	};
	370
	371	/* Return 0 if detection is successful, -ENODEV otherwise */
	372	static int max1668_detect(struct i2c_client *client,
	373	struct i2c_board_info *info)
	374	{
	375	struct i2c_adapter *adapter = client->adapter;
	376	const char *type_name;
	377	int man_id, dev_id;
	378
	379	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	380	return -ENODEV;
	381
	382	/* Check for unsupported part */
	383	man_id = i2c_smbus_read_byte_data(client, MAX1668_REG_MAN_ID);
	384	if (man_id != MAN_ID_MAXIM)
	385	return -ENODEV;
	386
	387	dev_id = i2c_smbus_read_byte_data(client, MAX1668_REG_DEV_ID);
	388	if (dev_id < 0)
	389	return -ENODEV;
	390
	391	type_name = NULL;
	392	if (dev_id == DEV_ID_MAX1668)
	393	type_name = "max1668";
	394	else if (dev_id == DEV_ID_MAX1805)
	395	type_name = "max1805";
	396	else if (dev_id == DEV_ID_MAX1989)
	397	type_name = "max1989";
	398
	399	if (!type_name)
	400	return -ENODEV;
	401
	402	strlcpy(info->type, type_name, I2C_NAME_SIZE);
	403
	404	return 0;
	405	}
	406
	407	static int max1668_probe(struct i2c_client *client,
	408	const struct i2c_device_id *id)
409	{
410	struct i2c_adapter *adapter = client->adapter;
5230551a GR	411	struct device *dev = &client->dev;
5230551a GR	412	struct device *hwmon_dev;
731b4cac	413	struct max1668_data *data;
731b4cac DG	414
	415	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	416	return -ENODEV;
	417
5230551a	418	data = devm_kzalloc(dev, sizeof(struct max1668_data), GFP_KERNEL);
731b4cac DG	419	if (!data)
	420	return -ENOMEM;
	421
5230551a	422	data->client = client;
731b4cac DG	423	data->type = id->driver_data;
	424	mutex_init(&data->update_lock);
	425
5230551a GR	426	/* sysfs hooks */
5230551a GR	427	data->groups[0] = &max1668_group_common;
731b4cac	428	if (data->type == max1668 \|\| data->type == max1989)
5230551a	429	data->groups[1] = &max1668_group_unique;
731b4cac	430
5230551a GR	431	hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
	432	data, data->groups);
	433	return PTR_ERR_OR_ZERO(hwmon_dev);
731b4cac DG	434	}
	435
	436	static const struct i2c_device_id max1668_id[] = {
	437	{ "max1668", max1668 },
	438	{ "max1805", max1805 },
	439	{ "max1989", max1989 },
	440	{ }
	441	};
	442	MODULE_DEVICE_TABLE(i2c, max1668_id);
	443
	444	/* This is the driver that will be inserted */
	445	static struct i2c_driver max1668_driver = {
	446	.class = I2C_CLASS_HWMON,
	447	.driver = {
	448	.name = "max1668",
	449	},
	450	.probe = max1668_probe,
731b4cac DG	451	.id_table = max1668_id,
	452	.detect = max1668_detect,
	453	.address_list = max1668_addr_list,
	454	};
	455
f0967eea	456	module_i2c_driver(max1668_driver);
731b4cac DG	457
	458	MODULE_AUTHOR("David George <david.george@ska.ac.za>");
	459	MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver");
	460	MODULE_LICENSE("GPL");