[linux-2.6-block.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 device		*hwmon_dev;
	struct attribute_group	attrs;
	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 i2c_client *client = to_i2c_client(dev);
	struct ad7418_data *data = i2c_get_clientdata(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 i2c_client *client = to_i2c_client(dev);
	struct ad7418_data *data = i2c_get_clientdata(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_attributes[] = {
	&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
};

static struct attribute *ad7417_attributes[] = {
	&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
};

static struct attribute *ad7418_attributes[] = {
	&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
};

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 i2c_adapter *adapter = client->adapter;
	struct ad7418_data *data;
	int err;

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

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

	i2c_set_clientdata(client, data);

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

	switch (data->type) {
	case ad7416:
		data->adc_max = 0;
		data->attrs.attrs = ad7416_attributes;
		break;

	case ad7417:
		data->adc_max = 4;
		data->attrs.attrs = ad7417_attributes;
		break;

	case ad7418:
		data->adc_max = 1;
		data->attrs.attrs = ad7418_attributes;
		break;
	}

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

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

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

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

	return 0;

exit_remove:
	sysfs_remove_group(&client->dev.kobj, &data->attrs);
	return err;
}

static int ad7418_remove(struct i2c_client *client)
{
	struct ad7418_data *data = i2c_get_clientdata(client);
	hwmon_device_unregister(data->hwmon_dev);
	sysfs_remove_group(&client->dev.kobj, &data->attrs);
	return 0;
}

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,
	.remove		= ad7418_remove,
	.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 {
1beeffe4	47	struct device *hwmon_dev;
2d8dd65f AZ	48	struct attribute_group attrs;
	49	enum chips type;
	50	struct mutex lock;
	51	int adc_max; /* number of ADC channels */
	52	char valid;
	53	unsigned long last_updated; /* In jiffies */
	54	s16 temp[3]; /* Register values */
	55	u16 in[4];
	56	};
	57
2d8dd65f AZ	58	static struct ad7418_data ad7418_update_device(struct device dev)
	59	{
	60	struct i2c_client *client = to_i2c_client(dev);
	61	struct ad7418_data *data = i2c_get_clientdata(client);
	62
	63	mutex_lock(&data->lock);
	64
	65	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	66	\|\| !data->valid) {
	67	u8 cfg;
	68	int i, ch;
	69
	70	/* read config register and clear channel bits */
	71	cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
	72	cfg &= 0x1F;
	73
	74	i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
	75	cfg \| AD7418_CH_TEMP);
	76	udelay(30);
	77
	78	for (i = 0; i < 3; i++) {
90f4102c JD	79	data->temp[i] =
	80	i2c_smbus_read_word_swapped(client,
	81	AD7418_REG_TEMP[i]);
2d8dd65f AZ	82	}
	83
	84	for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
	85	i2c_smbus_write_byte_data(client,
	86	AD7418_REG_CONF,
	87	cfg \| AD7418_REG_ADC_CH(ch));
	88
	89	udelay(15);
	90	data->in[data->adc_max - 1 - i] =
90f4102c JD	91	i2c_smbus_read_word_swapped(client,
90f4102c JD	92	AD7418_REG_ADC);
2d8dd65f AZ	93	}
	94
	95	/* restore old configuration value */
90f4102c	96	i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg);
2d8dd65f AZ	97
	98	data->last_updated = jiffies;
	99	data->valid = 1;
	100	}
	101
	102	mutex_unlock(&data->lock);
	103
	104	return data;
	105	}
	106
	107	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	108	char *buf)
	109	{
	110	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	111	struct ad7418_data *data = ad7418_update_device(dev);
	112	return sprintf(buf, "%d\n",
	113	LM75_TEMP_FROM_REG(data->temp[attr->index]));
	114	}
	115
	116	static ssize_t show_adc(struct device dev, struct device_attribute devattr,
	117	char *buf)
	118	{
	119	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	120	struct ad7418_data *data = ad7418_update_device(dev);
	121
	122	return sprintf(buf, "%d\n",
	123	((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
	124	}
	125
	126	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
	127	const char *buf, size_t count)
	128	{
	129	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	130	struct i2c_client *client = to_i2c_client(dev);
	131	struct ad7418_data *data = i2c_get_clientdata(client);
e91aef22 FM	132	long temp;
	133	int ret = kstrtol(buf, 10, &temp);
	134
	135	if (ret < 0)
	136	return ret;
2d8dd65f AZ	137
	138	mutex_lock(&data->lock);
	139	data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
90f4102c JD	140	i2c_smbus_write_word_swapped(client,
	141	AD7418_REG_TEMP[attr->index],
	142	data->temp[attr->index]);
2d8dd65f AZ	143	mutex_unlock(&data->lock);
	144	return count;
	145	}
	146
	147	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	148	static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
	149	show_temp, set_temp, 1);
	150	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	151	show_temp, set_temp, 2);
	152
	153	static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
	154	static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
	155	static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
	156	static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
	157
2d8dd65f AZ	158	static struct attribute *ad7416_attributes[] = {
	159	&sensor_dev_attr_temp1_max.dev_attr.attr,
	160	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	161	&sensor_dev_attr_temp1_input.dev_attr.attr,
	162	NULL
	163	};
	164
	165	static struct attribute *ad7417_attributes[] = {
	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	};
	175
	176	static struct attribute *ad7418_attributes[] = {
	177	&sensor_dev_attr_temp1_max.dev_attr.attr,
	178	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	179	&sensor_dev_attr_temp1_input.dev_attr.attr,
	180	&sensor_dev_attr_in1_input.dev_attr.attr,
	181	NULL
	182	};
	183
991763a9 AL	184	static void ad7418_init_client(struct i2c_client *client)
	185	{
	186	struct ad7418_data *data = i2c_get_clientdata(client);
	187
	188	int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
	189	if (reg < 0) {
	190	dev_err(&client->dev, "cannot read configuration register\n");
	191	} else {
	192	dev_info(&client->dev, "configuring for mode 1\n");
	193	i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
	194
	195	if (data->type == ad7417 \|\| data->type == ad7418)
	196	i2c_smbus_write_byte_data(client,
	197	AD7418_REG_CONF2, 0x00);
	198	}
	199	}
	200
369932f6 JD	201	static int ad7418_probe(struct i2c_client *client,
369932f6 JD	202	const struct i2c_device_id *id)
2d8dd65f	203	{
369932f6	204	struct i2c_adapter *adapter = client->adapter;
2d8dd65f	205	struct ad7418_data *data;
369932f6	206	int err;
2d8dd65f AZ	207
2d8dd65f AZ	208	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
d5282926 GR	209	I2C_FUNC_SMBUS_WORD_DATA))
d5282926 GR	210	return -EOPNOTSUPP;
2d8dd65f	211
d5282926 GR	212	data = devm_kzalloc(&client->dev, sizeof(struct ad7418_data),
	213	GFP_KERNEL);
	214	if (!data)
	215	return -ENOMEM;
2d8dd65f	216
2d8dd65f AZ	217	i2c_set_clientdata(client, data);
	218
	219	mutex_init(&data->lock);
369932f6	220	data->type = id->driver_data;
2d8dd65f AZ	221
2d8dd65f AZ	222	switch (data->type) {
2d8dd65f AZ	223	case ad7416:
	224	data->adc_max = 0;
	225	data->attrs.attrs = ad7416_attributes;
2d8dd65f AZ	226	break;
	227
	228	case ad7417:
	229	data->adc_max = 4;
	230	data->attrs.attrs = ad7417_attributes;
2d8dd65f AZ	231	break;
	232
	233	case ad7418:
	234	data->adc_max = 1;
	235	data->attrs.attrs = ad7418_attributes;
2d8dd65f AZ	236	break;
	237	}
	238
2d8dd65f AZ	239	dev_info(&client->dev, "%s chip found\n", client->name);
	240
	241	/* Initialize the AD7418 chip */
	242	ad7418_init_client(client);
	243
	244	/* Register sysfs hooks */
e91aef22 FM	245	err = sysfs_create_group(&client->dev.kobj, &data->attrs);
e91aef22 FM	246	if (err)
d5282926	247	return err;
2d8dd65f	248
1beeffe4 TJ	249	data->hwmon_dev = hwmon_device_register(&client->dev);
	250	if (IS_ERR(data->hwmon_dev)) {
	251	err = PTR_ERR(data->hwmon_dev);
2d8dd65f AZ	252	goto exit_remove;
	253	}
	254
	255	return 0;
	256
	257	exit_remove:
	258	sysfs_remove_group(&client->dev.kobj, &data->attrs);
2d8dd65f AZ	259	return err;
	260	}
	261
369932f6	262	static int ad7418_remove(struct i2c_client *client)
2d8dd65f AZ	263	{
2d8dd65f AZ	264	struct ad7418_data *data = i2c_get_clientdata(client);
1beeffe4	265	hwmon_device_unregister(data->hwmon_dev);
2d8dd65f	266	sysfs_remove_group(&client->dev.kobj, &data->attrs);
2d8dd65f AZ	267	return 0;
	268	}
	269
991763a9 AL	270	static const struct i2c_device_id ad7418_id[] = {
	271	{ "ad7416", ad7416 },
	272	{ "ad7417", ad7417 },
	273	{ "ad7418", ad7418 },
	274	{ }
	275	};
	276	MODULE_DEVICE_TABLE(i2c, ad7418_id);
	277
	278	static struct i2c_driver ad7418_driver = {
	279	.driver = {
	280	.name = "ad7418",
	281	},
	282	.probe = ad7418_probe,
	283	.remove = ad7418_remove,
	284	.id_table = ad7418_id,
	285	};
	286
f0967eea	287	module_i2c_driver(ad7418_driver);
2d8dd65f AZ	288
	289	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	290	MODULE_DESCRIPTION("AD7416/17/18 driver");
	291	MODULE_LICENSE("GPL");
	292	MODULE_VERSION(DRV_VERSION);