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Commit d84ca5b3 authored by Wolfram Sang's avatar Wolfram Sang Committed by Jean Delvare
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hwmon: Add driver for ADT7411 voltage and temperature sensor 



Add basic support for the ADT7411. Reads out all conversion results (via I2C,
SPI yet missing) and allows some on-the-fly configuration. Tested with a
custom board.

Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: default avatarWolfram Sang <w.sang@pengutronix.de>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 5852f960

Documentation/hwmon/adt7411

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Kernel driver adt7411

=====================



Supported chips:

  * Analog Devices ADT7411

    Prefix: 'adt7411'

    Addresses scanned: 0x48, 0x4a, 0x4b

    Datasheet: Publicly available at the Analog Devices website



Author: Wolfram Sang (based on adt7470 by Darrick J. Wong)



Description

-----------



This driver implements support for the Analog Devices ADT7411 chip. There may

be other chips that implement this interface.



The ADT7411 can use an I2C/SMBus compatible 2-wire interface or an

SPI-compatible 4-wire interface. It provides a 10-bit analog to digital

converter which measures 1 temperature, vdd and 8 input voltages. It has an

internal temperature sensor, but an external one can also be connected (one

loses 2 inputs then). There are high- and low-limit registers for all inputs.



Check the datasheet for details.



sysfs-Interface

---------------



in0_input	- vdd voltage input

in[1-8]_input	- analog 1-8 input

temp1_input	- temperature input



Besides standard interfaces, this driver adds (0 = off, 1 = on):



  adc_ref_vdd	- Use vdd as reference instead of 2.25 V

  fast_sampling	- Sample at 22.5 kHz instead of 1.4 kHz, but drop filters

  no_average	- Turn off averaging over 16 samples



Notes

-----



SPI, external temperature sensor and limit registers are not supported yet.

drivers/hwmon/Kconfig

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@@ -170,6 +170,16 @@ config SENSORS_ADM9240 
	  This driver can also be built as a module.  If so, the module

	  will be called adm9240.



config SENSORS_ADT7411

	tristate "Analog Devices ADT7411"

	depends on I2C && EXPERIMENTAL

	help

	  If you say yes here you get support for the Analog Devices

	  ADT7411 voltage and temperature monitoring chip.



	  This driver can also be built as a module. If so, the module

	  will be called adt7411.



config SENSORS_ADT7462

	tristate "Analog Devices ADT7462"

	depends on I2C && EXPERIMENTAL

drivers/hwmon/Makefile

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@@ -29,6 +29,7 @@ obj-$(CONFIG_SENSORS_ADM1029) += adm1029.o 
obj-$(CONFIG_SENSORS_ADM1031)	+= adm1031.o

obj-$(CONFIG_SENSORS_ADM9240)	+= adm9240.o

obj-$(CONFIG_SENSORS_ADS7828)	+= ads7828.o

obj-$(CONFIG_SENSORS_ADT7411)	+= adt7411.o

obj-$(CONFIG_SENSORS_ADT7462)	+= adt7462.o

obj-$(CONFIG_SENSORS_ADT7470)	+= adt7470.o

obj-$(CONFIG_SENSORS_ADT7473)	+= adt7473.o

drivers/hwmon/adt7411.c

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/*

 *  Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)

 *

 *  Copyright (C) 2008, 2010 Pengutronix

 *

 *  This program is free software; you can redistribute it and/or modify

 *  it under the terms of the GNU General Public License version 2 as

 *  published by the Free Software Foundation.

 *

 *  TODO: SPI, support for external temperature sensor

 * 	  use power-down mode for suspend?, interrupt handling?

 */



#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/err.h>

#include <linux/delay.h>

#include <linux/mutex.h>

#include <linux/jiffies.h>

#include <linux/i2c.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>



#define ADT7411_REG_INT_TEMP_VDD_LSB		0x03

#define ADT7411_REG_EXT_TEMP_AIN14_LSB		0x04

#define ADT7411_REG_VDD_MSB			0x06

#define ADT7411_REG_INT_TEMP_MSB		0x07

#define ADT7411_REG_EXT_TEMP_AIN1_MSB		0x08



#define ADT7411_REG_CFG1			0x18

#define ADT7411_CFG1_START_MONITOR		(1 << 0)



#define ADT7411_REG_CFG2			0x19

#define ADT7411_CFG2_DISABLE_AVG		(1 << 5)



#define ADT7411_REG_CFG3			0x1a

#define ADT7411_CFG3_ADC_CLK_225		(1 << 0)

#define ADT7411_CFG3_REF_VDD			(1 << 4)



#define ADT7411_REG_DEVICE_ID			0x4d

#define ADT7411_REG_MANUFACTURER_ID		0x4e



#define ADT7411_DEVICE_ID			0x2

#define ADT7411_MANUFACTURER_ID			0x41



static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };



struct adt7411_data {

	struct mutex device_lock;	/* for "atomic" device accesses */

	unsigned long next_update;

	int vref_cached;

	bool ref_is_vdd;

	struct device *hwmon_dev;

};



/*

 * When reading a register containing (up to 4) lsb, all associated

 * msb-registers get locked by the hardware. After _one_ of those msb is read,

 * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb

 * is protected here with a mutex, too.

 */

static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,

				u8 msb_reg, u8 lsb_shift)

{

	struct adt7411_data *data = i2c_get_clientdata(client);

	int val, tmp;



	mutex_lock(&data->device_lock);



	val = i2c_smbus_read_byte_data(client, lsb_reg);

	if (val < 0)

		goto exit_unlock;



	tmp = (val >> lsb_shift) & 3;

	val = i2c_smbus_read_byte_data(client, msb_reg);



	if (val >= 0)

		val = (val << 2) | tmp;



 exit_unlock:

	mutex_unlock(&data->device_lock);



	return val;

}



static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,

				bool flag)

{

	struct adt7411_data *data = i2c_get_clientdata(client);

	int ret, val;



	mutex_lock(&data->device_lock);



	ret = i2c_smbus_read_byte_data(client, reg);

	if (ret < 0)

		goto exit_unlock;



	if (flag)

		val = ret | bit;

	else

		val = ret & ~bit;



	ret = i2c_smbus_write_byte_data(client, reg, val);



 exit_unlock:

	mutex_unlock(&data->device_lock);

	return ret;

}



static ssize_t adt7411_show_vdd(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	struct i2c_client *client = to_i2c_client(dev);

	int ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,

			ADT7411_REG_VDD_MSB, 2);



	return ret < 0 ? ret : sprintf(buf, "%u\n", ret * 7000 / 1024);

}



static ssize_t adt7411_show_temp(struct device *dev,

			struct device_attribute *attr, char *buf)

{

	struct i2c_client *client = to_i2c_client(dev);

	int val = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,

			ADT7411_REG_INT_TEMP_MSB, 0);



	if (val < 0)

		return val;



	val = val & 0x200 ? val - 0x400 : val; /* 10 bit signed */



	return sprintf(buf, "%d\n", val * 250);

}



static ssize_t adt7411_show_input(struct device *dev,

				  struct device_attribute *attr, char *buf)

{

	int nr = to_sensor_dev_attr(attr)->index;

	struct i2c_client *client = to_i2c_client(dev);

	struct adt7411_data *data = i2c_get_clientdata(client);

	int val;

	u8 lsb_reg, lsb_shift;



	if (time_after_eq(jiffies, data->next_update)) {

		val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);

		if (val < 0)

			return val;

		data->ref_is_vdd = val & ADT7411_CFG3_REF_VDD;



		if (data->ref_is_vdd) {

			val = adt7411_read_10_bit(client,

					ADT7411_REG_INT_TEMP_VDD_LSB,

					ADT7411_REG_VDD_MSB, 2);

			if (val < 0)

				return val;



			data->vref_cached = val * 7000 / 1024;

		} else {

			data->vref_cached = 2250;

		}



		data->next_update = jiffies + HZ;

	}



	lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);

	lsb_shift = 2 * (nr & 0x03);

	val = adt7411_read_10_bit(client, lsb_reg,

			ADT7411_REG_EXT_TEMP_AIN1_MSB + nr, lsb_shift);



	return val < 0 ? val :

			sprintf(buf, "%u\n", val * data->vref_cached / 1024);

}



static ssize_t adt7411_show_bit(struct device *dev,

				struct device_attribute *attr, char *buf)

{

	struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);

	struct i2c_client *client = to_i2c_client(dev);

	int ret = i2c_smbus_read_byte_data(client, attr2->index);



	return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));

}



static ssize_t adt7411_set_bit(struct device *dev,

			       struct device_attribute *attr, const char *buf,

			       size_t count)

{

	struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);

	struct i2c_client *client = to_i2c_client(dev);

	struct adt7411_data *data = i2c_get_clientdata(client);

	int ret;

	unsigned long flag;



	ret = strict_strtoul(buf, 0, &flag);

	if (ret || flag > 1)

		return -EINVAL;



	ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);



	/* force update */

	data->next_update = jiffies;



	return ret < 0 ? ret : count;

}



#define ADT7411_BIT_ATTR(__name, __reg, __bit) \

	SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \

	adt7411_set_bit, __bit, __reg)



static DEVICE_ATTR(temp1_input, S_IRUGO, adt7411_show_temp, NULL);

static DEVICE_ATTR(in0_input, S_IRUGO, adt7411_show_vdd, NULL);

static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, adt7411_show_input, NULL, 0);

static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, adt7411_show_input, NULL, 1);

static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, adt7411_show_input, NULL, 2);

static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, adt7411_show_input, NULL, 3);

static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, adt7411_show_input, NULL, 4);

static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, adt7411_show_input, NULL, 5);

static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, adt7411_show_input, NULL, 6);

static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, adt7411_show_input, NULL, 7);

static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);

static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);

static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);



static struct attribute *adt7411_attrs[] = {

	&dev_attr_temp1_input.attr,

	&dev_attr_in0_input.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,

	&sensor_dev_attr_in5_input.dev_attr.attr,

	&sensor_dev_attr_in6_input.dev_attr.attr,

	&sensor_dev_attr_in7_input.dev_attr.attr,

	&sensor_dev_attr_in8_input.dev_attr.attr,

	&sensor_dev_attr_no_average.dev_attr.attr,

	&sensor_dev_attr_fast_sampling.dev_attr.attr,

	&sensor_dev_attr_adc_ref_vdd.dev_attr.attr,

	NULL

};



static const struct attribute_group adt7411_attr_grp = {

	.attrs = adt7411_attrs,

};



static int adt7411_detect(struct i2c_client *client,

			  struct i2c_board_info *info)

{

	int val;



	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))

		return -ENODEV;



	val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);

	if (val < 0 || val != ADT7411_MANUFACTURER_ID) {

		dev_dbg(&client->dev, "Wrong manufacturer ID. Got %d, "

			"expected %d\n", val, ADT7411_MANUFACTURER_ID);

		return -ENODEV;

	}



	val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);

	if (val < 0 || val != ADT7411_DEVICE_ID) {

		dev_dbg(&client->dev, "Wrong device ID. Got %d, "

			"expected %d\n", val, ADT7411_DEVICE_ID);

		return -ENODEV;

	}



	strlcpy(info->type, "adt7411", I2C_NAME_SIZE);



	return 0;

}



static int __devinit adt7411_probe(struct i2c_client *client,

				   const struct i2c_device_id *id)

{

	struct adt7411_data *data;

	int ret;



	data = kzalloc(sizeof(*data), GFP_KERNEL);

	if (!data)

		return -ENOMEM;



	i2c_set_clientdata(client, data);

	mutex_init(&data->device_lock);



	ret = adt7411_modify_bit(client, ADT7411_REG_CFG1,

				 ADT7411_CFG1_START_MONITOR, 1);

	if (ret < 0)

		goto exit_free;



	/* force update on first occasion */

	data->next_update = jiffies;



	ret = sysfs_create_group(&client->dev.kobj, &adt7411_attr_grp);

	if (ret)

		goto exit_free;



	data->hwmon_dev = hwmon_device_register(&client->dev);

	if (IS_ERR(data->hwmon_dev)) {

		ret = PTR_ERR(data->hwmon_dev);

		goto exit_remove;

	}



	dev_info(&client->dev, "successfully registered\n");



	return 0;



 exit_remove:

	sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp);

 exit_free:

	i2c_set_clientdata(client, NULL);

	kfree(data);

	return ret;

}



static int __devexit adt7411_remove(struct i2c_client *client)

{

	struct adt7411_data *data = i2c_get_clientdata(client);



	hwmon_device_unregister(data->hwmon_dev);

	sysfs_remove_group(&client->dev.kobj, &adt7411_attr_grp);

	i2c_set_clientdata(client, NULL);

	kfree(data);

	return 0;

}



static const struct i2c_device_id adt7411_id[] = {

	{ "adt7411", 0 },

	{ }

};



static struct i2c_driver adt7411_driver = {

	.driver		= {

		.name		= "adt7411",

	},

	.probe  = adt7411_probe,

	.remove	= __devexit_p(adt7411_remove),

	.id_table = adt7411_id,

	.detect = adt7411_detect,

	.address_list = normal_i2c,

	.class = I2C_CLASS_HWMON,

};



static int __init sensors_adt7411_init(void)

{

	return i2c_add_driver(&adt7411_driver);

}

module_init(sensors_adt7411_init)



static void __exit sensors_adt7411_exit(void)

{

	i2c_del_driver(&adt7411_driver);

}

module_exit(sensors_adt7411_exit)



MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "

	"Wolfram Sang <w.sang@pengutronix.de>");

MODULE_DESCRIPTION("ADT7411 driver");

MODULE_LICENSE("GPL v2");