[deliverable/linux.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 int ad7418_probe(struct i2c_client *client,
			const struct i2c_device_id *id);
static int ad7418_remove(struct i2c_client *client);

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,
};

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 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 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;
}

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
369932f6 JD	58	static int ad7418_probe(struct i2c_client *client,
	59	const struct i2c_device_id *id);
	60	static int ad7418_remove(struct i2c_client *client);
	61
	62	static const struct i2c_device_id ad7418_id[] = {
	63	{ "ad7416", ad7416 },
	64	{ "ad7417", ad7417 },
	65	{ "ad7418", ad7418 },
	66	{ }
	67	};
	68	MODULE_DEVICE_TABLE(i2c, ad7418_id);
2d8dd65f AZ	69
	70	static struct i2c_driver ad7418_driver = {
	71	.driver = {
	72	.name = "ad7418",
	73	},
369932f6 JD	74	.probe = ad7418_probe,
	75	.remove = ad7418_remove,
	76	.id_table = ad7418_id,
2d8dd65f AZ	77	};
2d8dd65f AZ	78
2d8dd65f AZ	79	static void ad7418_init_client(struct i2c_client *client)
	80	{
	81	struct ad7418_data *data = i2c_get_clientdata(client);
	82
	83	int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
	84	if (reg < 0) {
	85	dev_err(&client->dev, "cannot read configuration register\n");
	86	} else {
	87	dev_info(&client->dev, "configuring for mode 1\n");
	88	i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
	89
	90	if (data->type == ad7417 \|\| data->type == ad7418)
	91	i2c_smbus_write_byte_data(client,
	92	AD7418_REG_CONF2, 0x00);
	93	}
	94	}
	95
	96	static struct ad7418_data ad7418_update_device(struct device dev)
	97	{
	98	struct i2c_client *client = to_i2c_client(dev);
	99	struct ad7418_data *data = i2c_get_clientdata(client);
	100
	101	mutex_lock(&data->lock);
	102
	103	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	104	\|\| !data->valid) {
	105	u8 cfg;
	106	int i, ch;
	107
	108	/* read config register and clear channel bits */
	109	cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
	110	cfg &= 0x1F;
	111
	112	i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
	113	cfg \| AD7418_CH_TEMP);
	114	udelay(30);
	115
	116	for (i = 0; i < 3; i++) {
90f4102c JD	117	data->temp[i] =
	118	i2c_smbus_read_word_swapped(client,
	119	AD7418_REG_TEMP[i]);
2d8dd65f AZ	120	}
	121
	122	for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
	123	i2c_smbus_write_byte_data(client,
	124	AD7418_REG_CONF,
	125	cfg \| AD7418_REG_ADC_CH(ch));
	126
	127	udelay(15);
	128	data->in[data->adc_max - 1 - i] =
90f4102c JD	129	i2c_smbus_read_word_swapped(client,
90f4102c JD	130	AD7418_REG_ADC);
2d8dd65f AZ	131	}
	132
	133	/* restore old configuration value */
90f4102c	134	i2c_smbus_write_word_swapped(client, AD7418_REG_CONF, cfg);
2d8dd65f AZ	135
	136	data->last_updated = jiffies;
	137	data->valid = 1;
	138	}
	139
	140	mutex_unlock(&data->lock);
	141
	142	return data;
	143	}
	144
	145	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
	146	char *buf)
	147	{
	148	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	149	struct ad7418_data *data = ad7418_update_device(dev);
	150	return sprintf(buf, "%d\n",
	151	LM75_TEMP_FROM_REG(data->temp[attr->index]));
	152	}
	153
	154	static ssize_t show_adc(struct device dev, struct device_attribute devattr,
	155	char *buf)
	156	{
	157	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	158	struct ad7418_data *data = ad7418_update_device(dev);
	159
	160	return sprintf(buf, "%d\n",
	161	((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
	162	}
	163
	164	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
	165	const char *buf, size_t count)
	166	{
	167	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
	168	struct i2c_client *client = to_i2c_client(dev);
	169	struct ad7418_data *data = i2c_get_clientdata(client);
e91aef22 FM	170	long temp;
	171	int ret = kstrtol(buf, 10, &temp);
	172
	173	if (ret < 0)
	174	return ret;
2d8dd65f AZ	175
	176	mutex_lock(&data->lock);
	177	data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
90f4102c JD	178	i2c_smbus_write_word_swapped(client,
	179	AD7418_REG_TEMP[attr->index],
	180	data->temp[attr->index]);
2d8dd65f AZ	181	mutex_unlock(&data->lock);
	182	return count;
	183	}
	184
	185	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	186	static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
	187	show_temp, set_temp, 1);
	188	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	189	show_temp, set_temp, 2);
	190
	191	static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
	192	static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
	193	static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
	194	static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
	195
2d8dd65f AZ	196	static struct attribute *ad7416_attributes[] = {
	197	&sensor_dev_attr_temp1_max.dev_attr.attr,
	198	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	199	&sensor_dev_attr_temp1_input.dev_attr.attr,
	200	NULL
	201	};
	202
	203	static struct attribute *ad7417_attributes[] = {
	204	&sensor_dev_attr_temp1_max.dev_attr.attr,
	205	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	206	&sensor_dev_attr_temp1_input.dev_attr.attr,
	207	&sensor_dev_attr_in1_input.dev_attr.attr,
	208	&sensor_dev_attr_in2_input.dev_attr.attr,
	209	&sensor_dev_attr_in3_input.dev_attr.attr,
	210	&sensor_dev_attr_in4_input.dev_attr.attr,
	211	NULL
	212	};
	213
	214	static struct attribute *ad7418_attributes[] = {
	215	&sensor_dev_attr_temp1_max.dev_attr.attr,
	216	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	217	&sensor_dev_attr_temp1_input.dev_attr.attr,
	218	&sensor_dev_attr_in1_input.dev_attr.attr,
	219	NULL
	220	};
	221
369932f6 JD	222	static int ad7418_probe(struct i2c_client *client,
369932f6 JD	223	const struct i2c_device_id *id)
2d8dd65f	224	{
369932f6	225	struct i2c_adapter *adapter = client->adapter;
2d8dd65f	226	struct ad7418_data *data;
369932f6	227	int err;
2d8dd65f AZ	228
2d8dd65f AZ	229	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
d5282926 GR	230	I2C_FUNC_SMBUS_WORD_DATA))
d5282926 GR	231	return -EOPNOTSUPP;
2d8dd65f	232
d5282926 GR	233	data = devm_kzalloc(&client->dev, sizeof(struct ad7418_data),
	234	GFP_KERNEL);
	235	if (!data)
	236	return -ENOMEM;
2d8dd65f	237
2d8dd65f AZ	238	i2c_set_clientdata(client, data);
	239
	240	mutex_init(&data->lock);
369932f6	241	data->type = id->driver_data;
2d8dd65f AZ	242
2d8dd65f AZ	243	switch (data->type) {
2d8dd65f AZ	244	case ad7416:
	245	data->adc_max = 0;
	246	data->attrs.attrs = ad7416_attributes;
2d8dd65f AZ	247	break;
	248
	249	case ad7417:
	250	data->adc_max = 4;
	251	data->attrs.attrs = ad7417_attributes;
2d8dd65f AZ	252	break;
	253
	254	case ad7418:
	255	data->adc_max = 1;
	256	data->attrs.attrs = ad7418_attributes;
2d8dd65f AZ	257	break;
	258	}
	259
2d8dd65f AZ	260	dev_info(&client->dev, "%s chip found\n", client->name);
	261
	262	/* Initialize the AD7418 chip */
	263	ad7418_init_client(client);
	264
	265	/* Register sysfs hooks */
e91aef22 FM	266	err = sysfs_create_group(&client->dev.kobj, &data->attrs);
e91aef22 FM	267	if (err)
d5282926	268	return err;
2d8dd65f	269
1beeffe4 TJ	270	data->hwmon_dev = hwmon_device_register(&client->dev);
	271	if (IS_ERR(data->hwmon_dev)) {
	272	err = PTR_ERR(data->hwmon_dev);
2d8dd65f AZ	273	goto exit_remove;
	274	}
	275
	276	return 0;
	277
	278	exit_remove:
	279	sysfs_remove_group(&client->dev.kobj, &data->attrs);
2d8dd65f AZ	280	return err;
	281	}
	282
369932f6	283	static int ad7418_remove(struct i2c_client *client)
2d8dd65f AZ	284	{
2d8dd65f AZ	285	struct ad7418_data *data = i2c_get_clientdata(client);
1beeffe4	286	hwmon_device_unregister(data->hwmon_dev);
2d8dd65f	287	sysfs_remove_group(&client->dev.kobj, &data->attrs);
2d8dd65f AZ	288	return 0;
	289	}
	290
f0967eea	291	module_i2c_driver(ad7418_driver);
2d8dd65f AZ	292
	293	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	294	MODULE_DESCRIPTION("AD7416/17/18 driver");
	295	MODULE_LICENSE("GPL");
	296	MODULE_VERSION(DRV_VERSION);