[mirror_ubuntu-bionic-kernel.git] / drivers / hwmon / ad7418.c

/*
 * An hwmon driver for the Analog Devices AD7416/17/18
 * Copyright (C) 2006-07 Tower Technologies
 *
 * Author: Alessandro Zummo <a.zummo@towertech.it>
 *
 * Based on lm75.c
 * Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
 *
 * 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 - version 2.
 */

#include <linux/module.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/delay.h>
#include <linux/slab.h>

#include "lm75.h"

#define DRV_VERSION "0.4"

enum chips { ad7416, ad7417, ad7418 };

/* AD7418 registers */
#define AD7418_REG_TEMP_IN	0x00
#define AD7418_REG_CONF		0x01
#define AD7418_REG_TEMP_HYST	0x02
#define AD7418_REG_TEMP_OS	0x03
#define AD7418_REG_ADC		0x04
#define AD7418_REG_CONF2	0x05

#define AD7418_REG_ADC_CH(x)	((x) << 5)
#define AD7418_CH_TEMP		AD7418_REG_ADC_CH(0)

static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,
					AD7418_REG_TEMP_HYST,
					AD7418_REG_TEMP_OS };

struct ad7418_data {
	struct i2c_client	*client;
	enum chips		type;
	struct mutex		lock;
	int			adc_max;	/* number of ADC channels */
	char			valid;
	unsigned long		last_updated;	/* In jiffies */
	s16			temp[3];	/* Register values */
	u16			in[4];
};

static struct ad7418_data *ad7418_update_device(struct device *dev)
{
	struct ad7418_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;

	mutex_lock(&data->lock);

	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
		|| !data->valid) {
		u8 cfg;
		int i, ch;

		/* read config register and clear channel bits */
		cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
		cfg &= 0x1F;

		i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
						cfg | AD7418_CH_TEMP);
		udelay(30);

		for (i = 0; i < 3; i++) {
			data->temp[i] =
				i2c_smbus_read_word_swapped(client,
						AD7418_REG_TEMP[i]);
		}

		for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
			i2c_smbus_write_byte_data(client,
					AD7418_REG_CONF,
					cfg | AD7418_REG_ADC_CH(ch));

			udelay(15);
			data->in[data->adc_max - 1 - i] =
				i2c_smbus_read_word_swapped(client,
						AD7418_REG_ADC);
		}

		/* restore old configuration value */
		i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg);

		data->last_updated = jiffies;
		data->valid = 1;
	}

	mutex_unlock(&data->lock);

	return data;
}

static ssize_t show_temp(struct device *dev, struct device_attribute *devattr,
			char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct ad7418_data *data = ad7418_update_device(dev);
	return sprintf(buf, "%d\n",
		LM75_TEMP_FROM_REG(data->temp[attr->index]));
}

static ssize_t show_adc(struct device *dev, struct device_attribute *devattr,
			char *buf)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct ad7418_data *data = ad7418_update_device(dev);

	return sprintf(buf, "%d\n",
		((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
}

static ssize_t set_temp(struct device *dev, struct device_attribute *devattr,
			const char *buf, size_t count)
{
	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	struct ad7418_data *data = dev_get_drvdata(dev);
	struct i2c_client *client = data->client;
	long temp;
	int ret = kstrtol(buf, 10, &temp);

	if (ret < 0)
		return ret;

	mutex_lock(&data->lock);
	data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
	i2c_smbus_write_word_swapped(client,
				     AD7418_REG_TEMP[attr->index],
				     data->temp[attr->index]);
	mutex_unlock(&data->lock);
	return count;
}

static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO,
				show_temp, set_temp, 1);
static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO,
				show_temp, set_temp, 2);

static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);

static struct attribute *ad7416_attrs[] = {
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(ad7416);

static struct attribute *ad7417_attrs[] = {
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	&sensor_dev_attr_in2_input.dev_attr.attr,
	&sensor_dev_attr_in3_input.dev_attr.attr,
	&sensor_dev_attr_in4_input.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(ad7417);

static struct attribute *ad7418_attrs[] = {
	&sensor_dev_attr_temp1_max.dev_attr.attr,
	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	&sensor_dev_attr_temp1_input.dev_attr.attr,
	&sensor_dev_attr_in1_input.dev_attr.attr,
	NULL
};
ATTRIBUTE_GROUPS(ad7418);

static void ad7418_init_client(struct i2c_client *client)
{
	struct ad7418_data *data = i2c_get_clientdata(client);

	int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
	if (reg < 0) {
		dev_err(&client->dev, "cannot read configuration register\n");
	} else {
		dev_info(&client->dev, "configuring for mode 1\n");
		i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);

		if (data->type == ad7417 || data->type == ad7418)
			i2c_smbus_write_byte_data(client,
						AD7418_REG_CONF2, 0x00);
	}
}

static int ad7418_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct device *dev = &client->dev;
	struct i2c_adapter *adapter = client->adapter;
	struct ad7418_data *data;
	struct device *hwmon_dev;
	const struct attribute_group **attr_groups = NULL;

	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
					I2C_FUNC_SMBUS_WORD_DATA))
		return -EOPNOTSUPP;

	data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	i2c_set_clientdata(client, data);

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

	switch (data->type) {
	case ad7416:
		data->adc_max = 0;
		attr_groups = ad7416_groups;
		break;

	case ad7417:
		data->adc_max = 4;
		attr_groups = ad7417_groups;
		break;

	case ad7418:
		data->adc_max = 1;
		attr_groups = ad7418_groups;
		break;
	}

	dev_info(dev, "%s chip found\n", client->name);

	/* Initialize the AD7418 chip */
	ad7418_init_client(client);

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

static const struct i2c_device_id ad7418_id[] = {
	{ "ad7416", ad7416 },
	{ "ad7417", ad7417 },
	{ "ad7418", ad7418 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, ad7418_id);

static struct i2c_driver ad7418_driver = {
	.driver = {
		.name	= "ad7418",
	},
	.probe		= ad7418_probe,
	.id_table	= ad7418_id,
};

module_i2c_driver(ad7418_driver);

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("AD7416/17/18 driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
Commit	Line	Data
2d8dd65f AZ	1	/*
	2	* An hwmon driver for the Analog Devices AD7416/17/18
	3	* Copyright (C) 2006-07 Tower Technologies
	4	*
	5	* Author: Alessandro Zummo <a.zummo@towertech.it>
	6	*
	7	* Based on lm75.c
	8	* Copyright (C) 1998-99 Frodo Looijaard <frodol@dds.nl>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License,
	12	* as published by the Free Software Foundation - version 2.
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/jiffies.h>
	17	#include <linux/i2c.h>
	18	#include <linux/hwmon.h>
	19	#include <linux/hwmon-sysfs.h>
	20	#include <linux/err.h>
	21	#include <linux/mutex.h>
	22	#include <linux/delay.h>
5a0e3ad6	23	#include <linux/slab.h>
2d8dd65f AZ	24
	25	#include "lm75.h"
	26
369932f6	27	#define DRV_VERSION "0.4"
2d8dd65f	28
369932f6	29	enum chips { ad7416, ad7417, ad7418 };
2d8dd65f AZ	30
	31	/* AD7418 registers */
	32	#define AD7418_REG_TEMP_IN 0x00
	33	#define AD7418_REG_CONF 0x01
	34	#define AD7418_REG_TEMP_HYST 0x02
	35	#define AD7418_REG_TEMP_OS 0x03
	36	#define AD7418_REG_ADC 0x04
	37	#define AD7418_REG_CONF2 0x05
	38
	39	#define AD7418_REG_ADC_CH(x) ((x) << 5)
	40	#define AD7418_CH_TEMP AD7418_REG_ADC_CH(0)
	41
	42	static const u8 AD7418_REG_TEMP[] = { AD7418_REG_TEMP_IN,
	43	AD7418_REG_TEMP_HYST,
	44	AD7418_REG_TEMP_OS };
	45
	46	struct ad7418_data {
337076f9	47	struct i2c_client *client;
2d8dd65f AZ	48	enum chips type;
	49	struct mutex lock;
	50	int adc_max; /* number of ADC channels */
	51	char valid;
	52	unsigned long last_updated; /* In jiffies */
	53	s16 temp[3]; /* Register values */
	54	u16 in[4];
	55	};
	56
2d8dd65f AZ	57	static struct ad7418_data ad7418_update_device(struct device dev)
2d8dd65f AZ	58	{
337076f9 AL	59	struct ad7418_data *data = dev_get_drvdata(dev);
337076f9 AL	60	struct i2c_client *client = data->client;
2d8dd65f AZ	61
	62	mutex_lock(&data->lock);
	63
	64	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	65	\|\| !data->valid) {
	66	u8 cfg;
	67	int i, ch;
	68
	69	/* read config register and clear channel bits */
	70	cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
	71	cfg &= 0x1F;
	72
	73	i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
	74	cfg \| AD7418_CH_TEMP);
	75	udelay(30);
	76
	77	for (i = 0; i < 3; i++) {
90f4102c JD	78	data->temp[i] =
	79	i2c_smbus_read_word_swapped(client,
	80	AD7418_REG_TEMP[i]);
2d8dd65f AZ	81	}
	82
	83	for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
	84	i2c_smbus_write_byte_data(client,
	85	AD7418_REG_CONF,
	86	cfg \| AD7418_REG_ADC_CH(ch));
	87
	88	udelay(15);
	89	data->in[data->adc_max - 1 - i] =
90f4102c JD	90	i2c_smbus_read_word_swapped(client,
90f4102c JD	91	AD7418_REG_ADC);
2d8dd65f AZ	92	}
	93
	94	/* restore old configuration value */
90f4102c	95	i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg);
2d8dd65f AZ	96
	97	data->last_updated = jiffies;
	98	data->valid = 1;
	99	}
	100
	101	mutex_unlock(&data->lock);
	102
	103	return data;
	104	}
	105
	106	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	107	char *buf)
	108	{
	109	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	110	struct ad7418_data *data = ad7418_update_device(dev);
	111	return sprintf(buf, "%d\n",
	112	LM75_TEMP_FROM_REG(data->temp[attr->index]));
	113	}
	114
	115	static ssize_t show_adc(struct device dev, struct device_attribute devattr,
	116	char *buf)
	117	{
	118	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	119	struct ad7418_data *data = ad7418_update_device(dev);
	120
	121	return sprintf(buf, "%d\n",
	122	((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
	123	}
	124
	125	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
	126	const char *buf, size_t count)
	127	{
	128	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
337076f9 AL	129	struct ad7418_data *data = dev_get_drvdata(dev);
337076f9 AL	130	struct i2c_client *client = data->client;
e91aef22 FM	131	long temp;
	132	int ret = kstrtol(buf, 10, &temp);
	133
	134	if (ret < 0)
	135	return ret;
2d8dd65f AZ	136
	137	mutex_lock(&data->lock);
	138	data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
90f4102c JD	139	i2c_smbus_write_word_swapped(client,
	140	AD7418_REG_TEMP[attr->index],
	141	data->temp[attr->index]);
2d8dd65f AZ	142	mutex_unlock(&data->lock);
	143	return count;
	144	}
	145
	146	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	147	static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
	148	show_temp, set_temp, 1);
	149	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	150	show_temp, set_temp, 2);
	151
	152	static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
	153	static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
	154	static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
	155	static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
	156
337076f9	157	static struct attribute *ad7416_attrs[] = {
2d8dd65f AZ	158	&sensor_dev_attr_temp1_max.dev_attr.attr,
	159	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	160	&sensor_dev_attr_temp1_input.dev_attr.attr,
	161	NULL
	162	};
337076f9	163	ATTRIBUTE_GROUPS(ad7416);
2d8dd65f	164
337076f9	165	static struct attribute *ad7417_attrs[] = {
2d8dd65f AZ	166	&sensor_dev_attr_temp1_max.dev_attr.attr,
	167	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	168	&sensor_dev_attr_temp1_input.dev_attr.attr,
	169	&sensor_dev_attr_in1_input.dev_attr.attr,
	170	&sensor_dev_attr_in2_input.dev_attr.attr,
	171	&sensor_dev_attr_in3_input.dev_attr.attr,
	172	&sensor_dev_attr_in4_input.dev_attr.attr,
	173	NULL
	174	};
337076f9	175	ATTRIBUTE_GROUPS(ad7417);
2d8dd65f	176
337076f9	177	static struct attribute *ad7418_attrs[] = {
2d8dd65f AZ	178	&sensor_dev_attr_temp1_max.dev_attr.attr,
	179	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	180	&sensor_dev_attr_temp1_input.dev_attr.attr,
	181	&sensor_dev_attr_in1_input.dev_attr.attr,
	182	NULL
	183	};
337076f9	184	ATTRIBUTE_GROUPS(ad7418);
2d8dd65f	185
991763a9 AL	186	static void ad7418_init_client(struct i2c_client *client)
	187	{
	188	struct ad7418_data *data = i2c_get_clientdata(client);
	189
	190	int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
	191	if (reg < 0) {
	192	dev_err(&client->dev, "cannot read configuration register\n");
	193	} else {
	194	dev_info(&client->dev, "configuring for mode 1\n");
	195	i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
	196
	197	if (data->type == ad7417 \|\| data->type == ad7418)
	198	i2c_smbus_write_byte_data(client,
	199	AD7418_REG_CONF2, 0x00);
	200	}
	201	}
	202
369932f6 JD	203	static int ad7418_probe(struct i2c_client *client,
369932f6 JD	204	const struct i2c_device_id *id)
2d8dd65f	205	{
337076f9	206	struct device *dev = &client->dev;
369932f6	207	struct i2c_adapter *adapter = client->adapter;
2d8dd65f	208	struct ad7418_data *data;
337076f9 AL	209	struct device *hwmon_dev;
337076f9 AL	210	const struct attribute_group **attr_groups = NULL;
2d8dd65f AZ	211
2d8dd65f AZ	212	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
d5282926 GR	213	I2C_FUNC_SMBUS_WORD_DATA))
d5282926 GR	214	return -EOPNOTSUPP;
2d8dd65f	215
337076f9	216	data = devm_kzalloc(dev, sizeof(struct ad7418_data), GFP_KERNEL);
d5282926 GR	217	if (!data)
d5282926 GR	218	return -ENOMEM;
2d8dd65f	219
2d8dd65f AZ	220	i2c_set_clientdata(client, data);
	221
	222	mutex_init(&data->lock);
337076f9	223	data->client = client;
369932f6	224	data->type = id->driver_data;
2d8dd65f AZ	225
2d8dd65f AZ	226	switch (data->type) {
2d8dd65f AZ	227	case ad7416:
2d8dd65f AZ	228	data->adc_max = 0;
337076f9	229	attr_groups = ad7416_groups;
2d8dd65f AZ	230	break;
	231
	232	case ad7417:
	233	data->adc_max = 4;
337076f9	234	attr_groups = ad7417_groups;
2d8dd65f AZ	235	break;
	236
	237	case ad7418:
	238	data->adc_max = 1;
337076f9	239	attr_groups = ad7418_groups;
2d8dd65f AZ	240	break;
	241	}
	242
337076f9	243	dev_info(dev, "%s chip found\n", client->name);
2d8dd65f AZ	244
	245	/* Initialize the AD7418 chip */
	246	ad7418_init_client(client);
	247
337076f9 AL	248	hwmon_dev = devm_hwmon_device_register_with_groups(dev,
	249	client->name,
	250	data, attr_groups);
	251	return PTR_ERR_OR_ZERO(hwmon_dev);
2d8dd65f AZ	252	}
2d8dd65f AZ	253
991763a9 AL	254	static const struct i2c_device_id ad7418_id[] = {
	255	{ "ad7416", ad7416 },
	256	{ "ad7417", ad7417 },
	257	{ "ad7418", ad7418 },
	258	{ }
	259	};
	260	MODULE_DEVICE_TABLE(i2c, ad7418_id);
	261
	262	static struct i2c_driver ad7418_driver = {
	263	.driver = {
	264	.name = "ad7418",
	265	},
	266	.probe = ad7418_probe,
991763a9 AL	267	.id_table = ad7418_id,
	268	};
	269
f0967eea	270	module_i2c_driver(ad7418_driver);
2d8dd65f AZ	271
	272	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	273	MODULE_DESCRIPTION("AD7416/17/18 driver");
	274	MODULE_LICENSE("GPL");
	275	MODULE_VERSION(DRV_VERSION);