[deliverable/linux.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 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 device *hwmon_dev;
	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 i2c_client *client = to_i2c_client(dev);
	struct max1668_data *data = i2c_get_clientdata(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 i2c_client *client = to_i2c_client(dev);
	struct max1668_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);
	data->temp_max[index] = clamp_val(temp/1000, -128, 127);
	if (i2c_smbus_write_byte_data(client,
					MAX1668_REG_LIMH_WR(index),
					data->temp_max[index]))
		count = -EIO;
	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 i2c_client *client = to_i2c_client(dev);
	struct max1668_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);
	data->temp_min[index] = clamp_val(temp/1000, -128, 127);
	if (i2c_smbus_write_byte_data(client,
					MAX1668_REG_LIML_WR(index),
					data->temp_max[index]))
		count = -EIO;
	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 max1668_data *data;
	int err;

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

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

	i2c_set_clientdata(client, data);
	data->type = id->driver_data;
	mutex_init(&data->update_lock);

	/* Register sysfs hooks */
	err = sysfs_create_group(&client->dev.kobj, &max1668_group_common);
	if (err)
		return err;

	if (data->type == max1668 || data->type == max1989) {
		err = sysfs_create_group(&client->dev.kobj,
					 &max1668_group_unique);
		if (err)
			goto error_sysrem0;
	}

	data->hwmon_dev = hwmon_device_register(&client->dev);
	if (IS_ERR(data->hwmon_dev)) {
		err = PTR_ERR(data->hwmon_dev);
		goto error_sysrem1;
	}

	return 0;

error_sysrem1:
	if (data->type == max1668 || data->type == max1989)
		sysfs_remove_group(&client->dev.kobj, &max1668_group_unique);
error_sysrem0:
	sysfs_remove_group(&client->dev.kobj, &max1668_group_common);
	return err;
}

static int max1668_remove(struct i2c_client *client)
{
	struct max1668_data *data = i2c_get_clientdata(client);

	hwmon_device_unregister(data->hwmon_dev);
	if (data->type == max1668 || data->type == max1989)
		sysfs_remove_group(&client->dev.kobj, &max1668_group_unique);

	sysfs_remove_group(&client->dev.kobj, &max1668_group_common);

	return 0;
}

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,
	.remove	= max1668_remove,
	.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 */
	33	static unsigned short max1668_addr_list[] = {
	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 {
	69	struct device *hwmon_dev;
	70	enum chips type;
	71
	72	struct mutex update_lock;
	73	char valid; /* !=0 if following fields are valid */
	74	unsigned long last_updated; /* In jiffies */
	75
	76	/* 1x local and 4x remote */
	77	s8 temp_max[5];
	78	s8 temp_min[5];
	79	s8 temp[5];
	80	u16 alarms;
	81	};
	82
	83	static struct max1668_data max1668_update_device(struct device dev)
	84	{
	85	struct i2c_client *client = to_i2c_client(dev);
	86	struct max1668_data *data = i2c_get_clientdata(client);
	87	struct max1668_data *ret = data;
	88	s32 val;
	89	int i;
	90
	91	mutex_lock(&data->update_lock);
	92
	93	if (data->valid && !time_after(jiffies,
	94	data->last_updated + HZ + HZ / 2))
	95	goto abort;
	96
	97	for (i = 0; i < 5; i++) {
	98	val = i2c_smbus_read_byte_data(client, MAX1668_REG_TEMP(i));
	99	if (unlikely(val < 0)) {
	100	ret = ERR_PTR(val);
	101	goto abort;
	102	}
	103	data->temp[i] = (s8) val;
	104
	105	val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIMH_RD(i));
	106	if (unlikely(val < 0)) {
	107	ret = ERR_PTR(val);
	108	goto abort;
	109	}
	110	data->temp_max[i] = (s8) val;
	111
	112	val = i2c_smbus_read_byte_data(client, MAX1668_REG_LIML_RD(i));
	113	if (unlikely(val < 0)) {
	114	ret = ERR_PTR(val);
	115	goto abort;
	116	}
	117	data->temp_min[i] = (s8) val;
	118	}
	119
	120	val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT1);
	121	if (unlikely(val < 0)) {
	122	ret = ERR_PTR(val);
	123	goto abort;
	124	}
dabaa0d2	125	data->alarms = val << 8;
731b4cac DG	126
	127	val = i2c_smbus_read_byte_data(client, MAX1668_REG_STAT2);
	128	if (unlikely(val < 0)) {
	129	ret = ERR_PTR(val);
	130	goto abort;
	131	}
dabaa0d2	132	data->alarms \|= val;
731b4cac DG	133
	134	data->last_updated = jiffies;
	135	data->valid = 1;
	136	abort:
	137	mutex_unlock(&data->update_lock);
	138
	139	return ret;
	140	}
	141
	142	static ssize_t show_temp(struct device *dev,
	143	struct device_attribute devattr, char buf)
	144	{
	145	int index = to_sensor_dev_attr(devattr)->index;
	146	struct max1668_data *data = max1668_update_device(dev);
	147
	148	if (IS_ERR(data))
	149	return PTR_ERR(data);
	150
	151	return sprintf(buf, "%d\n", data->temp[index] * 1000);
	152	}
	153
	154	static ssize_t show_temp_max(struct device *dev,
	155	struct device_attribute devattr, char buf)
	156	{
	157	int index = to_sensor_dev_attr(devattr)->index;
	158	struct max1668_data *data = max1668_update_device(dev);
	159
	160	if (IS_ERR(data))
	161	return PTR_ERR(data);
	162
	163	return sprintf(buf, "%d\n", data->temp_max[index] * 1000);
	164	}
	165
	166	static ssize_t show_temp_min(struct device *dev,
	167	struct device_attribute devattr, char buf)
	168	{
	169	int index = to_sensor_dev_attr(devattr)->index;
	170	struct max1668_data *data = max1668_update_device(dev);
	171
	172	if (IS_ERR(data))
	173	return PTR_ERR(data);
	174
	175	return sprintf(buf, "%d\n", data->temp_min[index] * 1000);
	176	}
	177
	178	static ssize_t show_alarm(struct device dev, struct device_attribute attr,
	179	char *buf)
	180	{
	181	int index = to_sensor_dev_attr(attr)->index;
	182	struct max1668_data *data = max1668_update_device(dev);
	183
	184	if (IS_ERR(data))
	185	return PTR_ERR(data);
	186
	187	return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1);
	188	}
	189
dabaa0d2 GR	190	static ssize_t show_fault(struct device *dev,
	191	struct device_attribute devattr, char buf)
	192	{
	193	int index = to_sensor_dev_attr(devattr)->index;
	194	struct max1668_data *data = max1668_update_device(dev);
	195
	196	if (IS_ERR(data))
	197	return PTR_ERR(data);
	198
	199	return sprintf(buf, "%u\n",
	200	(data->alarms & (1 << 12)) && data->temp[index] == 127);
	201	}
	202
731b4cac DG	203	static ssize_t set_temp_max(struct device *dev,
	204	struct device_attribute *devattr,
	205	const char *buf, size_t count)
	206	{
	207	int index = to_sensor_dev_attr(devattr)->index;
	208	struct i2c_client *client = to_i2c_client(dev);
	209	struct max1668_data *data = i2c_get_clientdata(client);
	210	long temp;
	211	int ret;
	212
	213	ret = kstrtol(buf, 10, &temp);
	214	if (ret < 0)
	215	return ret;
	216
	217	mutex_lock(&data->update_lock);
2a844c14	218	data->temp_max[index] = clamp_val(temp/1000, -128, 127);
731b4cac DG	219	if (i2c_smbus_write_byte_data(client,
	220	MAX1668_REG_LIMH_WR(index),
	221	data->temp_max[index]))
	222	count = -EIO;
	223	mutex_unlock(&data->update_lock);
	224
	225	return count;
	226	}
	227
	228	static ssize_t set_temp_min(struct device *dev,
	229	struct device_attribute *devattr,
	230	const char *buf, size_t count)
	231	{
	232	int index = to_sensor_dev_attr(devattr)->index;
	233	struct i2c_client *client = to_i2c_client(dev);
	234	struct max1668_data *data = i2c_get_clientdata(client);
	235	long temp;
	236	int ret;
	237
	238	ret = kstrtol(buf, 10, &temp);
	239	if (ret < 0)
	240	return ret;
	241
	242	mutex_lock(&data->update_lock);
2a844c14	243	data->temp_min[index] = clamp_val(temp/1000, -128, 127);
731b4cac DG	244	if (i2c_smbus_write_byte_data(client,
	245	MAX1668_REG_LIML_WR(index),
	246	data->temp_max[index]))
	247	count = -EIO;
	248	mutex_unlock(&data->update_lock);
	249
	250	return count;
	251	}
	252
	253	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	254	static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp_max,
	255	set_temp_max, 0);
	256	static SENSOR_DEVICE_ATTR(temp1_min, S_IRUGO, show_temp_min,
	257	set_temp_min, 0);
	258	static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, show_temp, NULL, 1);
	259	static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO, show_temp_max,
	260	set_temp_max, 1);
	261	static SENSOR_DEVICE_ATTR(temp2_min, S_IRUGO, show_temp_min,
	262	set_temp_min, 1);
	263	static SENSOR_DEVICE_ATTR(temp3_input, S_IRUGO, show_temp, NULL, 2);
	264	static SENSOR_DEVICE_ATTR(temp3_max, S_IRUGO, show_temp_max,
	265	set_temp_max, 2);
	266	static SENSOR_DEVICE_ATTR(temp3_min, S_IRUGO, show_temp_min,
	267	set_temp_min, 2);
	268	static SENSOR_DEVICE_ATTR(temp4_input, S_IRUGO, show_temp, NULL, 3);
	269	static SENSOR_DEVICE_ATTR(temp4_max, S_IRUGO, show_temp_max,
	270	set_temp_max, 3);
	271	static SENSOR_DEVICE_ATTR(temp4_min, S_IRUGO, show_temp_min,
	272	set_temp_min, 3);
	273	static SENSOR_DEVICE_ATTR(temp5_input, S_IRUGO, show_temp, NULL, 4);
	274	static SENSOR_DEVICE_ATTR(temp5_max, S_IRUGO, show_temp_max,
	275	set_temp_max, 4);
	276	static SENSOR_DEVICE_ATTR(temp5_min, S_IRUGO, show_temp_min,
	277	set_temp_min, 4);
	278
	279	static SENSOR_DEVICE_ATTR(temp1_max_alarm, S_IRUGO, show_alarm, NULL, 14);
	280	static SENSOR_DEVICE_ATTR(temp1_min_alarm, S_IRUGO, show_alarm, NULL, 13);
	281	static SENSOR_DEVICE_ATTR(temp2_min_alarm, S_IRUGO, show_alarm, NULL, 7);
	282	static SENSOR_DEVICE_ATTR(temp2_max_alarm, S_IRUGO, show_alarm, NULL, 6);
	283	static SENSOR_DEVICE_ATTR(temp3_min_alarm, S_IRUGO, show_alarm, NULL, 5);
	284	static SENSOR_DEVICE_ATTR(temp3_max_alarm, S_IRUGO, show_alarm, NULL, 4);
	285	static SENSOR_DEVICE_ATTR(temp4_min_alarm, S_IRUGO, show_alarm, NULL, 3);
	286	static SENSOR_DEVICE_ATTR(temp4_max_alarm, S_IRUGO, show_alarm, NULL, 2);
	287	static SENSOR_DEVICE_ATTR(temp5_min_alarm, S_IRUGO, show_alarm, NULL, 1);
	288	static SENSOR_DEVICE_ATTR(temp5_max_alarm, S_IRUGO, show_alarm, NULL, 0);
	289
dabaa0d2 GR	290	static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_fault, NULL, 1);
	291	static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_fault, NULL, 2);
	292	static SENSOR_DEVICE_ATTR(temp4_fault, S_IRUGO, show_fault, NULL, 3);
	293	static SENSOR_DEVICE_ATTR(temp5_fault, S_IRUGO, show_fault, NULL, 4);
	294
731b4cac DG	295	/* Attributes common to MAX1668, MAX1989 and MAX1805 */
	296	static struct attribute *max1668_attribute_common[] = {
	297	&sensor_dev_attr_temp1_max.dev_attr.attr,
	298	&sensor_dev_attr_temp1_min.dev_attr.attr,
	299	&sensor_dev_attr_temp1_input.dev_attr.attr,
	300	&sensor_dev_attr_temp2_max.dev_attr.attr,
	301	&sensor_dev_attr_temp2_min.dev_attr.attr,
	302	&sensor_dev_attr_temp2_input.dev_attr.attr,
	303	&sensor_dev_attr_temp3_max.dev_attr.attr,
	304	&sensor_dev_attr_temp3_min.dev_attr.attr,
	305	&sensor_dev_attr_temp3_input.dev_attr.attr,
	306
	307	&sensor_dev_attr_temp1_max_alarm.dev_attr.attr,
	308	&sensor_dev_attr_temp1_min_alarm.dev_attr.attr,
	309	&sensor_dev_attr_temp2_max_alarm.dev_attr.attr,
	310	&sensor_dev_attr_temp2_min_alarm.dev_attr.attr,
	311	&sensor_dev_attr_temp3_max_alarm.dev_attr.attr,
	312	&sensor_dev_attr_temp3_min_alarm.dev_attr.attr,
dabaa0d2 GR	313
	314	&sensor_dev_attr_temp2_fault.dev_attr.attr,
	315	&sensor_dev_attr_temp3_fault.dev_attr.attr,
731b4cac DG	316	NULL
	317	};
	318
	319	/* Attributes not present on MAX1805 */
	320	static struct attribute *max1668_attribute_unique[] = {
	321	&sensor_dev_attr_temp4_max.dev_attr.attr,
	322	&sensor_dev_attr_temp4_min.dev_attr.attr,
	323	&sensor_dev_attr_temp4_input.dev_attr.attr,
	324	&sensor_dev_attr_temp5_max.dev_attr.attr,
	325	&sensor_dev_attr_temp5_min.dev_attr.attr,
	326	&sensor_dev_attr_temp5_input.dev_attr.attr,
	327
	328	&sensor_dev_attr_temp4_max_alarm.dev_attr.attr,
	329	&sensor_dev_attr_temp4_min_alarm.dev_attr.attr,
	330	&sensor_dev_attr_temp5_max_alarm.dev_attr.attr,
	331	&sensor_dev_attr_temp5_min_alarm.dev_attr.attr,
dabaa0d2 GR	332
	333	&sensor_dev_attr_temp4_fault.dev_attr.attr,
	334	&sensor_dev_attr_temp5_fault.dev_attr.attr,
731b4cac DG	335	NULL
	336	};
	337
587a1f16	338	static umode_t max1668_attribute_mode(struct kobject *kobj,
731b4cac DG	339	struct attribute *attr, int index)
731b4cac DG	340	{
587a1f16	341	umode_t ret = S_IRUGO;
731b4cac DG	342	if (read_only)
	343	return ret;
	344	if (attr == &sensor_dev_attr_temp1_max.dev_attr.attr \|\|
	345	attr == &sensor_dev_attr_temp2_max.dev_attr.attr \|\|
	346	attr == &sensor_dev_attr_temp3_max.dev_attr.attr \|\|
	347	attr == &sensor_dev_attr_temp4_max.dev_attr.attr \|\|
	348	attr == &sensor_dev_attr_temp5_max.dev_attr.attr \|\|
	349	attr == &sensor_dev_attr_temp1_min.dev_attr.attr \|\|
	350	attr == &sensor_dev_attr_temp2_min.dev_attr.attr \|\|
	351	attr == &sensor_dev_attr_temp3_min.dev_attr.attr \|\|
	352	attr == &sensor_dev_attr_temp4_min.dev_attr.attr \|\|
	353	attr == &sensor_dev_attr_temp5_min.dev_attr.attr)
	354	ret \|= S_IWUSR;
	355	return ret;
	356	}
	357
	358	static const struct attribute_group max1668_group_common = {
	359	.attrs = max1668_attribute_common,
	360	.is_visible = max1668_attribute_mode
	361	};
	362
	363	static const struct attribute_group max1668_group_unique = {
	364	.attrs = max1668_attribute_unique,
	365	.is_visible = max1668_attribute_mode
	366	};
	367
	368	/* Return 0 if detection is successful, -ENODEV otherwise */
	369	static int max1668_detect(struct i2c_client *client,
	370	struct i2c_board_info *info)
	371	{
	372	struct i2c_adapter *adapter = client->adapter;
	373	const char *type_name;
	374	int man_id, dev_id;
	375
	376	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
	377	return -ENODEV;
	378
	379	/* Check for unsupported part */
	380	man_id = i2c_smbus_read_byte_data(client, MAX1668_REG_MAN_ID);
	381	if (man_id != MAN_ID_MAXIM)
	382	return -ENODEV;
	383
	384	dev_id = i2c_smbus_read_byte_data(client, MAX1668_REG_DEV_ID);
	385	if (dev_id < 0)
	386	return -ENODEV;
	387
	388	type_name = NULL;
	389	if (dev_id == DEV_ID_MAX1668)
	390	type_name = "max1668";
	391	else if (dev_id == DEV_ID_MAX1805)
	392	type_name = "max1805";
	393	else if (dev_id == DEV_ID_MAX1989)
	394	type_name = "max1989";
	395
	396	if (!type_name)
	397	return -ENODEV;
	398
	399	strlcpy(info->type, type_name, I2C_NAME_SIZE);
	400
	401	return 0;
	402	}
	403
	404	static int max1668_probe(struct i2c_client *client,
	405	const struct i2c_device_id *id)
406	{
407	struct i2c_adapter *adapter = client->adapter;
408	struct max1668_data *data;
409	int err;
410
411	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
412	return -ENODEV;
413
7008b970 GR	414	data = devm_kzalloc(&client->dev, sizeof(struct max1668_data),
7008b970 GR	415	GFP_KERNEL);
731b4cac DG	416	if (!data)
	417	return -ENOMEM;
	418
	419	i2c_set_clientdata(client, data);
	420	data->type = id->driver_data;
	421	mutex_init(&data->update_lock);
	422
	423	/* Register sysfs hooks */
	424	err = sysfs_create_group(&client->dev.kobj, &max1668_group_common);
	425	if (err)
7008b970	426	return err;
731b4cac DG	427
	428	if (data->type == max1668 \|\| data->type == max1989) {
	429	err = sysfs_create_group(&client->dev.kobj,
	430	&max1668_group_unique);
	431	if (err)
	432	goto error_sysrem0;
	433	}
	434
	435	data->hwmon_dev = hwmon_device_register(&client->dev);
	436	if (IS_ERR(data->hwmon_dev)) {
	437	err = PTR_ERR(data->hwmon_dev);
	438	goto error_sysrem1;
	439	}
	440
	441	return 0;
	442
	443	error_sysrem1:
	444	if (data->type == max1668 \|\| data->type == max1989)
	445	sysfs_remove_group(&client->dev.kobj, &max1668_group_unique);
	446	error_sysrem0:
	447	sysfs_remove_group(&client->dev.kobj, &max1668_group_common);
731b4cac DG	448	return err;
	449	}
	450
	451	static int max1668_remove(struct i2c_client *client)
	452	{
	453	struct max1668_data *data = i2c_get_clientdata(client);
	454
	455	hwmon_device_unregister(data->hwmon_dev);
	456	if (data->type == max1668 \|\| data->type == max1989)
	457	sysfs_remove_group(&client->dev.kobj, &max1668_group_unique);
	458
	459	sysfs_remove_group(&client->dev.kobj, &max1668_group_common);
	460
731b4cac DG	461	return 0;
	462	}
	463
	464	static const struct i2c_device_id max1668_id[] = {
	465	{ "max1668", max1668 },
	466	{ "max1805", max1805 },
	467	{ "max1989", max1989 },
	468	{ }
	469	};
	470	MODULE_DEVICE_TABLE(i2c, max1668_id);
	471
	472	/* This is the driver that will be inserted */
	473	static struct i2c_driver max1668_driver = {
	474	.class = I2C_CLASS_HWMON,
	475	.driver = {
	476	.name = "max1668",
	477	},
	478	.probe = max1668_probe,
	479	.remove = max1668_remove,
	480	.id_table = max1668_id,
	481	.detect = max1668_detect,
	482	.address_list = max1668_addr_list,
	483	};
	484
f0967eea	485	module_i2c_driver(max1668_driver);
731b4cac DG	486
	487	MODULE_AUTHOR("David George <david.george@ska.ac.za>");
	488	MODULE_DESCRIPTION("MAX1668 remote temperature sensor driver");
	489	MODULE_LICENSE("GPL");