drivers/iio/temperature/tmp006.c - linux - Git at Google

 /*
  * tmp006.c - Support for TI TMP006 IR thermopile sensor
  *
  * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
  *
  * This file is subject to the terms and conditions of version 2 of
  * the GNU General Public License.  See the file COPYING in the main
  * directory of this archive for more details.
  *
  * Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
  *
  * (7-bit I2C slave address 0x40, changeable via ADR pins)
  *
  * TODO: data ready irq
  */

 #include <linux/err.h>
 #include <linux/i2c.h>
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/pm.h>
 #include <linux/bitops.h>

 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>

 #define TMP006_VOBJECT 0x00
 #define TMP006_TAMBIENT 0x01
 #define TMP006_CONFIG 0x02
 #define TMP006_MANUFACTURER_ID 0xfe
 #define TMP006_DEVICE_ID 0xff

 #define TMP006_TAMBIENT_SHIFT 2

 #define TMP006_CONFIG_RESET BIT(15)
 #define TMP006_CONFIG_DRDY_EN BIT(8)
 #define TMP006_CONFIG_DRDY BIT(7)

 #define TMP006_CONFIG_MOD_MASK 0x7000

 #define TMP006_CONFIG_CR_MASK 0x0e00
 #define TMP006_CONFIG_CR_SHIFT 9

 #define TMP006_MANUFACTURER_MAGIC 0x5449
 #define TMP006_DEVICE_MAGIC 0x0067

 struct tmp006_data {
 	struct i2c_client *client;
 	u16 config;
 };

 static int tmp006_read_measurement(struct tmp006_data *data, u8 reg)
 {
 	s32 ret;
 	int tries = 50;

 	while (tries-- > 0) {
 		ret = i2c_smbus_read_word_swapped(data->client,
 			TMP006_CONFIG);
 		if (ret < 0)
 			return ret;
 		if (ret & TMP006_CONFIG_DRDY)
 			break;
 		msleep(100);
 	}

 	if (tries < 0)
 		return -EIO;

 	return i2c_smbus_read_word_swapped(data->client, reg);
 }

 static const int tmp006_freqs[5][2] = { {4, 0}, {2, 0}, {1, 0},
 					{0, 500000}, {0, 250000} };

 static int tmp006_read_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *channel, int *val,
 			    int *val2, long mask)
 {
 	struct tmp006_data *data = iio_priv(indio_dev);
 	s32 ret;
 	int cr;

 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
 		if (channel->type == IIO_VOLTAGE) {
 			/* LSB is 156.25 nV */
 			ret = tmp006_read_measurement(data, TMP006_VOBJECT);
 			if (ret < 0)
 				return ret;
 			*val = sign_extend32(ret, 15);
 		} else if (channel->type == IIO_TEMP) {
 			/* LSB is 0.03125 degrees Celsius */
 			ret = tmp006_read_measurement(data, TMP006_TAMBIENT);
 			if (ret < 0)
 				return ret;
 			*val = sign_extend32(ret, 15) >> TMP006_TAMBIENT_SHIFT;
 		} else {
 			break;
 		}
 		return IIO_VAL_INT;
 	case IIO_CHAN_INFO_SCALE:
 		if (channel->type == IIO_VOLTAGE) {
 			*val = 0;
 			*val2 = 156250;
 		} else if (channel->type == IIO_TEMP) {
 			*val = 31;
 			*val2 = 250000;
 		} else {
 			break;
 		}
 		return IIO_VAL_INT_PLUS_MICRO;
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		cr = (data->config & TMP006_CONFIG_CR_MASK)
 			>> TMP006_CONFIG_CR_SHIFT;
 		*val = tmp006_freqs[cr][0];
 		*val2 = tmp006_freqs[cr][1];
 		return IIO_VAL_INT_PLUS_MICRO;
 	default:
 		break;
 	}

 	return -EINVAL;
 }

 static int tmp006_write_raw(struct iio_dev *indio_dev,
 			    struct iio_chan_spec const *chan,
 			    int val,
 			    int val2,
 			    long mask)
 {
 	struct tmp006_data *data = iio_priv(indio_dev);
 	int i;

 	if (mask != IIO_CHAN_INFO_SAMP_FREQ)
 		return -EINVAL;

 	for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++)
 		if ((val == tmp006_freqs[i][0]) &&
 		    (val2 == tmp006_freqs[i][1])) {
 			data->config &= ~TMP006_CONFIG_CR_MASK;
 			data->config |= i << TMP006_CONFIG_CR_SHIFT;

 			return i2c_smbus_write_word_swapped(data->client,
 							    TMP006_CONFIG,
 							    data->config);

 		}
 	return -EINVAL;
 }

 static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");

 static struct attribute *tmp006_attributes[] = {
 	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
 	NULL
 };

 static const struct attribute_group tmp006_attribute_group = {
 	.attrs = tmp006_attributes,
 };

 static const struct iio_chan_spec tmp006_channels[] = {
 	{
 		.type = IIO_VOLTAGE,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 			BIT(IIO_CHAN_INFO_SCALE),
 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 	},
 	{
 		.type = IIO_TEMP,
 		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
 			BIT(IIO_CHAN_INFO_SCALE),
 		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
 	}
 };

 static const struct iio_info tmp006_info = {
 	.read_raw = tmp006_read_raw,
 	.write_raw = tmp006_write_raw,
 	.attrs = &tmp006_attribute_group,
 	.driver_module = THIS_MODULE,
 };

 static bool tmp006_check_identification(struct i2c_client *client)
 {
 	int mid, did;

 	mid = i2c_smbus_read_word_swapped(client, TMP006_MANUFACTURER_ID);
 	if (mid < 0)
 		return false;

 	did = i2c_smbus_read_word_swapped(client, TMP006_DEVICE_ID);
 	if (did < 0)
 		return false;

 	return mid == TMP006_MANUFACTURER_MAGIC && did == TMP006_DEVICE_MAGIC;
 }

 static int tmp006_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
 	struct iio_dev *indio_dev;
 	struct tmp006_data *data;
 	int ret;

 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
 		return -ENODEV;

 	if (!tmp006_check_identification(client)) {
 		dev_err(&client->dev, "no TMP006 sensor\n");
 		return -ENODEV;
 	}

 	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
 	if (!indio_dev)
 		return -ENOMEM;

 	data = iio_priv(indio_dev);
 	i2c_set_clientdata(client, indio_dev);
 	data->client = client;

 	indio_dev->dev.parent = &client->dev;
 	indio_dev->name = dev_name(&client->dev);
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &tmp006_info;

 	indio_dev->channels = tmp006_channels;
 	indio_dev->num_channels = ARRAY_SIZE(tmp006_channels);

 	ret = i2c_smbus_read_word_swapped(data->client, TMP006_CONFIG);
 	if (ret < 0)
 		return ret;
 	data->config = ret;

 	return iio_device_register(indio_dev);
 }

 static int tmp006_powerdown(struct tmp006_data *data)
 {
 	return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
 		data->config & ~TMP006_CONFIG_MOD_MASK);
 }

 static int tmp006_remove(struct i2c_client *client)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(client);

 	iio_device_unregister(indio_dev);
 	tmp006_powerdown(iio_priv(indio_dev));

 	return 0;
 }

 #ifdef CONFIG_PM_SLEEP
 static int tmp006_suspend(struct device *dev)
 {
 	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
 	return tmp006_powerdown(iio_priv(indio_dev));
 }

 static int tmp006_resume(struct device *dev)
 {
 	struct tmp006_data *data = iio_priv(i2c_get_clientdata(
 		to_i2c_client(dev)));
 	return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
 		data->config | TMP006_CONFIG_MOD_MASK);
 }
 #endif

 static SIMPLE_DEV_PM_OPS(tmp006_pm_ops, tmp006_suspend, tmp006_resume);

 static const struct i2c_device_id tmp006_id[] = {
 	{ "tmp006", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, tmp006_id);

 static struct i2c_driver tmp006_driver = {
 	.driver = {
 		.name	= "tmp006",
 		.pm	= &tmp006_pm_ops,
 		.owner	= THIS_MODULE,
 	},
 	.probe = tmp006_probe,
 	.remove = tmp006_remove,
 	.id_table = tmp006_id,
 };
 module_i2c_driver(tmp006_driver);

 MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
 MODULE_DESCRIPTION("TI TMP006 IR thermopile sensor driver");
 MODULE_LICENSE("GPL");
	/*
	* tmp006.c - Support for TI TMP006 IR thermopile sensor
	*
	* Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
	*
	* This file is subject to the terms and conditions of version 2 of
	* the GNU General Public License. See the file COPYING in the main
	* directory of this archive for more details.
	*
	* Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
	*
	* (7-bit I2C slave address 0x40, changeable via ADR pins)
	*
	* TODO: data ready irq
	*/

	#include <linux/err.h>
	#include <linux/i2c.h>
	#include <linux/delay.h>
	#include <linux/module.h>
	#include <linux/pm.h>
	#include <linux/bitops.h>

	#include <linux/iio/iio.h>
	#include <linux/iio/sysfs.h>

	#define TMP006_VOBJECT 0x00
	#define TMP006_TAMBIENT 0x01
	#define TMP006_CONFIG 0x02
	#define TMP006_MANUFACTURER_ID 0xfe
	#define TMP006_DEVICE_ID 0xff

	#define TMP006_TAMBIENT_SHIFT 2

	#define TMP006_CONFIG_RESET BIT(15)
	#define TMP006_CONFIG_DRDY_EN BIT(8)
	#define TMP006_CONFIG_DRDY BIT(7)

	#define TMP006_CONFIG_MOD_MASK 0x7000

	#define TMP006_CONFIG_CR_MASK 0x0e00
	#define TMP006_CONFIG_CR_SHIFT 9

	#define TMP006_MANUFACTURER_MAGIC 0x5449
	#define TMP006_DEVICE_MAGIC 0x0067

	struct tmp006_data {
	struct i2c_client *client;
	u16 config;
	};

	static int tmp006_read_measurement(struct tmp006_data *data, u8 reg)
	{
	s32 ret;
	int tries = 50;

	while (tries-- > 0) {
	ret = i2c_smbus_read_word_swapped(data->client,
	TMP006_CONFIG);
	if (ret < 0)
	return ret;
	if (ret & TMP006_CONFIG_DRDY)
	break;
	msleep(100);
	}

	if (tries < 0)
	return -EIO;

	return i2c_smbus_read_word_swapped(data->client, reg);
	}

	static const int tmp006_freqs[5][2] = { {4, 0}, {2, 0}, {1, 0},
	{0, 500000}, {0, 250000} };

	static int tmp006_read_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const channel, int val,
	int *val2, long mask)
	{
	struct tmp006_data *data = iio_priv(indio_dev);
	s32 ret;
	int cr;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
	if (channel->type == IIO_VOLTAGE) {
	/* LSB is 156.25 nV */
	ret = tmp006_read_measurement(data, TMP006_VOBJECT);
	if (ret < 0)
	return ret;
	*val = sign_extend32(ret, 15);
	} else if (channel->type == IIO_TEMP) {
	/* LSB is 0.03125 degrees Celsius */
	ret = tmp006_read_measurement(data, TMP006_TAMBIENT);
	if (ret < 0)
	return ret;
	*val = sign_extend32(ret, 15) >> TMP006_TAMBIENT_SHIFT;
	} else {
	break;
	}
	return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
	if (channel->type == IIO_VOLTAGE) {
	*val = 0;
	*val2 = 156250;
	} else if (channel->type == IIO_TEMP) {
	*val = 31;
	*val2 = 250000;
	} else {
	break;
	}
	return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_SAMP_FREQ:
	cr = (data->config & TMP006_CONFIG_CR_MASK)
	>> TMP006_CONFIG_CR_SHIFT;
	*val = tmp006_freqs[cr][0];
	*val2 = tmp006_freqs[cr][1];
	return IIO_VAL_INT_PLUS_MICRO;
	default:
	break;
	}

	return -EINVAL;
	}

	static int tmp006_write_raw(struct iio_dev *indio_dev,
	struct iio_chan_spec const *chan,
	int val,
	int val2,
	long mask)
	{
	struct tmp006_data *data = iio_priv(indio_dev);
	int i;

	if (mask != IIO_CHAN_INFO_SAMP_FREQ)
	return -EINVAL;

	for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++)
	if ((val == tmp006_freqs[i][0]) &&
	(val2 == tmp006_freqs[i][1])) {
	data->config &= ~TMP006_CONFIG_CR_MASK;
	data->config \|= i << TMP006_CONFIG_CR_SHIFT;

	return i2c_smbus_write_word_swapped(data->client,
	TMP006_CONFIG,
	data->config);

	}
	return -EINVAL;
	}

	static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");

	static struct attribute *tmp006_attributes[] = {
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	NULL
	};

	static const struct attribute_group tmp006_attribute_group = {
	.attrs = tmp006_attributes,
	};

	static const struct iio_chan_spec tmp006_channels[] = {
	{
	.type = IIO_VOLTAGE,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
	BIT(IIO_CHAN_INFO_SCALE),
	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
	},
	{
	.type = IIO_TEMP,
	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) \|
	BIT(IIO_CHAN_INFO_SCALE),
	.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
	}
	};

	static const struct iio_info tmp006_info = {
	.read_raw = tmp006_read_raw,
	.write_raw = tmp006_write_raw,
	.attrs = &tmp006_attribute_group,
	.driver_module = THIS_MODULE,
	};

	static bool tmp006_check_identification(struct i2c_client *client)
	{
	int mid, did;

	mid = i2c_smbus_read_word_swapped(client, TMP006_MANUFACTURER_ID);
	if (mid < 0)
	return false;

	did = i2c_smbus_read_word_swapped(client, TMP006_DEVICE_ID);
	if (did < 0)
	return false;

	return mid == TMP006_MANUFACTURER_MAGIC && did == TMP006_DEVICE_MAGIC;
	}

	static int tmp006_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct iio_dev *indio_dev;
	struct tmp006_data *data;
	int ret;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
	return -ENODEV;

	if (!tmp006_check_identification(client)) {
	dev_err(&client->dev, "no TMP006 sensor\n");
	return -ENODEV;
	}

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev)
	return -ENOMEM;

	data = iio_priv(indio_dev);
	i2c_set_clientdata(client, indio_dev);
	data->client = client;

	indio_dev->dev.parent = &client->dev;
	indio_dev->name = dev_name(&client->dev);
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->info = &tmp006_info;

	indio_dev->channels = tmp006_channels;
	indio_dev->num_channels = ARRAY_SIZE(tmp006_channels);

	ret = i2c_smbus_read_word_swapped(data->client, TMP006_CONFIG);
	if (ret < 0)
	return ret;
	data->config = ret;

	return iio_device_register(indio_dev);
	}

	static int tmp006_powerdown(struct tmp006_data *data)
	{
	return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
	data->config & ~TMP006_CONFIG_MOD_MASK);
	}

	static int tmp006_remove(struct i2c_client *client)
	{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);
	tmp006_powerdown(iio_priv(indio_dev));

	return 0;
	}

	#ifdef CONFIG_PM_SLEEP
	static int tmp006_suspend(struct device *dev)
	{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	return tmp006_powerdown(iio_priv(indio_dev));
	}

	static int tmp006_resume(struct device *dev)
	{
	struct tmp006_data *data = iio_priv(i2c_get_clientdata(
	to_i2c_client(dev)));
	return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG,
	data->config \| TMP006_CONFIG_MOD_MASK);
	}
	#endif

	static SIMPLE_DEV_PM_OPS(tmp006_pm_ops, tmp006_suspend, tmp006_resume);

	static const struct i2c_device_id tmp006_id[] = {
	{ "tmp006", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, tmp006_id);

	static struct i2c_driver tmp006_driver = {
	.driver = {
	.name = "tmp006",
	.pm = &tmp006_pm_ops,
	.owner = THIS_MODULE,
	},
	.probe = tmp006_probe,
	.remove = tmp006_remove,
	.id_table = tmp006_id,
	};
	module_i2c_driver(tmp006_driver);

	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
	MODULE_DESCRIPTION("TI TMP006 IR thermopile sensor driver");
	MODULE_LICENSE("GPL");