[net-next-2.6.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,
};

/* All registers are word-sized, except for the configuration registers.
 * AD7418 uses a high-byte first convention. Do NOT use those functions to
 * access the configuration registers CONF and CONF2, as they are byte-sized.
 */
static inline int ad7418_read(struct i2c_client *client, u8 reg)
{
	return swab16(i2c_smbus_read_word_data(client, reg));
}

static inline int ad7418_write(struct i2c_client *client, u8 reg, u16 value)
{
	return i2c_smbus_write_word_data(client, reg, swab16(value));
}

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] = ad7418_read(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] =
				ad7418_read(client, AD7418_REG_ADC);
		}

		/* restore old configuration value */
		ad7418_write(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 = simple_strtol(buf, NULL, 10);

	mutex_lock(&data->lock);
	data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
	ad7418_write(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)) {
		err = -EOPNOTSUPP;
		goto exit;
	}

	if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) {
		err = -ENOMEM;
		goto exit;
	}

	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 */
	if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs)))
		goto exit_free;

	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);
exit_free:
	kfree(data);
exit:
	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);
	kfree(data);
	return 0;
}

static int __init ad7418_init(void)
{
	return i2c_add_driver(&ad7418_driver);
}

static void __exit ad7418_exit(void)
{
	i2c_del_driver(&ad7418_driver);
}

MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
MODULE_DESCRIPTION("AD7416/17/18 driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_init(ad7418_init);
module_exit(ad7418_exit);
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	};
	78
	79	/* All registers are word-sized, except for the configuration registers.
	80	* AD7418 uses a high-byte first convention. Do NOT use those functions to
	81	* access the configuration registers CONF and CONF2, as they are byte-sized.
	82	*/
	83	static inline int ad7418_read(struct i2c_client *client, u8 reg)
	84	{
	85	return swab16(i2c_smbus_read_word_data(client, reg));
	86	}
	87
	88	static inline int ad7418_write(struct i2c_client *client, u8 reg, u16 value)
	89	{
	90	return i2c_smbus_write_word_data(client, reg, swab16(value));
	91	}
	92
	93	static void ad7418_init_client(struct i2c_client *client)
	94	{
	95	struct ad7418_data *data = i2c_get_clientdata(client);
	96
	97	int reg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
	98	if (reg < 0) {
	99	dev_err(&client->dev, "cannot read configuration register\n");
	100	} else {
	101	dev_info(&client->dev, "configuring for mode 1\n");
	102	i2c_smbus_write_byte_data(client, AD7418_REG_CONF, reg & 0xfe);
	103
	104	if (data->type == ad7417 \|\| data->type == ad7418)
	105	i2c_smbus_write_byte_data(client,
	106	AD7418_REG_CONF2, 0x00);
	107	}
	108	}
	109
	110	static struct ad7418_data ad7418_update_device(struct device dev)
	111	{
	112	struct i2c_client *client = to_i2c_client(dev);
	113	struct ad7418_data *data = i2c_get_clientdata(client);
	114
	115	mutex_lock(&data->lock);
	116
	117	if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
	118	\|\| !data->valid) {
	119	u8 cfg;
	120	int i, ch;
	121
	122	/* read config register and clear channel bits */
	123	cfg = i2c_smbus_read_byte_data(client, AD7418_REG_CONF);
	124	cfg &= 0x1F;
	125
	126	i2c_smbus_write_byte_data(client, AD7418_REG_CONF,
	127	cfg \| AD7418_CH_TEMP);
	128	udelay(30);
	129
	130	for (i = 0; i < 3; i++) {
	131	data->temp[i] = ad7418_read(client, AD7418_REG_TEMP[i]);
	132	}
	133
	134	for (i = 0, ch = 4; i < data->adc_max; i++, ch--) {
	135	i2c_smbus_write_byte_data(client,
	136	AD7418_REG_CONF,
	137	cfg \| AD7418_REG_ADC_CH(ch));
	138
	139	udelay(15);
	140	data->in[data->adc_max - 1 - i] =
141	ad7418_read(client, AD7418_REG_ADC);
142	}
143
144	/* restore old configuration value */
145	ad7418_write(client, AD7418_REG_CONF, cfg);
146
147	data->last_updated = jiffies;
148	data->valid = 1;
149	}
150
151	mutex_unlock(&data->lock);
152
153	return data;
154	}
155
156	static ssize_t show_temp(struct device dev, struct device_attribute devattr,
157	char *buf)
158	{
159	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
160	struct ad7418_data *data = ad7418_update_device(dev);
161	return sprintf(buf, "%d\n",
162	LM75_TEMP_FROM_REG(data->temp[attr->index]));
163	}
164
165	static ssize_t show_adc(struct device dev, struct device_attribute devattr,
166	char *buf)
167	{
168	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
169	struct ad7418_data *data = ad7418_update_device(dev);
170
171	return sprintf(buf, "%d\n",
172	((data->in[attr->index] >> 6) * 2500 + 512) / 1024);
173	}
174
175	static ssize_t set_temp(struct device dev, struct device_attribute devattr,
176	const char *buf, size_t count)
177	{
178	struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
179	struct i2c_client *client = to_i2c_client(dev);
180	struct ad7418_data *data = i2c_get_clientdata(client);
5bfedac0	181	long temp = simple_strtol(buf, NULL, 10);
2d8dd65f AZ	182
	183	mutex_lock(&data->lock);
	184	data->temp[attr->index] = LM75_TEMP_TO_REG(temp);
	185	ad7418_write(client, AD7418_REG_TEMP[attr->index], data->temp[attr->index]);
	186	mutex_unlock(&data->lock);
	187	return count;
	188	}
	189
	190	static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL, 0);
	191	static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR \| S_IRUGO,
	192	show_temp, set_temp, 1);
	193	static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR \| S_IRUGO,
	194	show_temp, set_temp, 2);
	195
	196	static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, show_adc, NULL, 0);
	197	static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, show_adc, NULL, 1);
	198	static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, show_adc, NULL, 2);
	199	static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, show_adc, NULL, 3);
	200
2d8dd65f AZ	201	static struct attribute *ad7416_attributes[] = {
	202	&sensor_dev_attr_temp1_max.dev_attr.attr,
	203	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	204	&sensor_dev_attr_temp1_input.dev_attr.attr,
	205	NULL
	206	};
	207
	208	static struct attribute *ad7417_attributes[] = {
	209	&sensor_dev_attr_temp1_max.dev_attr.attr,
	210	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	211	&sensor_dev_attr_temp1_input.dev_attr.attr,
	212	&sensor_dev_attr_in1_input.dev_attr.attr,
	213	&sensor_dev_attr_in2_input.dev_attr.attr,
	214	&sensor_dev_attr_in3_input.dev_attr.attr,
	215	&sensor_dev_attr_in4_input.dev_attr.attr,
	216	NULL
	217	};
	218
	219	static struct attribute *ad7418_attributes[] = {
	220	&sensor_dev_attr_temp1_max.dev_attr.attr,
	221	&sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
	222	&sensor_dev_attr_temp1_input.dev_attr.attr,
	223	&sensor_dev_attr_in1_input.dev_attr.attr,
	224	NULL
	225	};
	226
369932f6 JD	227	static int ad7418_probe(struct i2c_client *client,
369932f6 JD	228	const struct i2c_device_id *id)
2d8dd65f	229	{
369932f6	230	struct i2c_adapter *adapter = client->adapter;
2d8dd65f	231	struct ad7418_data *data;
369932f6	232	int err;
2d8dd65f AZ	233
2d8dd65f AZ	234	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA \|
369932f6 JD	235	I2C_FUNC_SMBUS_WORD_DATA)) {
369932f6 JD	236	err = -EOPNOTSUPP;
2d8dd65f	237	goto exit;
369932f6	238	}
2d8dd65f AZ	239
	240	if (!(data = kzalloc(sizeof(struct ad7418_data), GFP_KERNEL))) {
	241	err = -ENOMEM;
	242	goto exit;
	243	}
	244
2d8dd65f AZ	245	i2c_set_clientdata(client, data);
	246
	247	mutex_init(&data->lock);
369932f6	248	data->type = id->driver_data;
2d8dd65f AZ	249
2d8dd65f AZ	250	switch (data->type) {
2d8dd65f AZ	251	case ad7416:
	252	data->adc_max = 0;
	253	data->attrs.attrs = ad7416_attributes;
2d8dd65f AZ	254	break;
	255
	256	case ad7417:
	257	data->adc_max = 4;
	258	data->attrs.attrs = ad7417_attributes;
2d8dd65f AZ	259	break;
	260
	261	case ad7418:
	262	data->adc_max = 1;
	263	data->attrs.attrs = ad7418_attributes;
2d8dd65f AZ	264	break;
	265	}
	266
2d8dd65f AZ	267	dev_info(&client->dev, "%s chip found\n", client->name);
	268
	269	/* Initialize the AD7418 chip */
	270	ad7418_init_client(client);
	271
	272	/* Register sysfs hooks */
	273	if ((err = sysfs_create_group(&client->dev.kobj, &data->attrs)))
369932f6	274	goto exit_free;
2d8dd65f	275
1beeffe4 TJ	276	data->hwmon_dev = hwmon_device_register(&client->dev);
	277	if (IS_ERR(data->hwmon_dev)) {
	278	err = PTR_ERR(data->hwmon_dev);
2d8dd65f AZ	279	goto exit_remove;
	280	}
	281
	282	return 0;
	283
	284	exit_remove:
	285	sysfs_remove_group(&client->dev.kobj, &data->attrs);
2d8dd65f AZ	286	exit_free:
	287	kfree(data);
	288	exit:
	289	return err;
	290	}
	291
369932f6	292	static int ad7418_remove(struct i2c_client *client)
2d8dd65f AZ	293	{
2d8dd65f AZ	294	struct ad7418_data *data = i2c_get_clientdata(client);
1beeffe4	295	hwmon_device_unregister(data->hwmon_dev);
2d8dd65f	296	sysfs_remove_group(&client->dev.kobj, &data->attrs);
2d8dd65f AZ	297	kfree(data);
	298	return 0;
	299	}
	300
	301	static int __init ad7418_init(void)
	302	{
	303	return i2c_add_driver(&ad7418_driver);
	304	}
	305
	306	static void __exit ad7418_exit(void)
	307	{
	308	i2c_del_driver(&ad7418_driver);
	309	}
	310
	311	MODULE_AUTHOR("Alessandro Zummo <a.zummo@towertech.it>");
	312	MODULE_DESCRIPTION("AD7416/17/18 driver");
	313	MODULE_LICENSE("GPL");
	314	MODULE_VERSION(DRV_VERSION);
	315
	316	module_init(ad7418_init);
	317	module_exit(ad7418_exit);