drivers/hwmon/ad7418.c - kernel/skids - Git at Google

 /*
  * 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);
	/*
	* 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);