[deliverable/linux.git] / drivers / iio / temperature / mlx90614.c

/*
 * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
 *
 * Copyright (c) 2014 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 Melexis MLX90614 I2C 16-bit IR thermopile sensor
 *
 * (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
 *
 * TODO: sleep mode, configuration EEPROM
 */

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>

#include <linux/iio/iio.h>

#define MLX90614_OP_RAM 0x00

/* RAM offsets with 16-bit data, MSB first */
#define MLX90614_TA	(MLX90614_OP_RAM | 0x06) /* ambient temperature */
#define MLX90614_TOBJ1	(MLX90614_OP_RAM | 0x07) /* object 1 temperature */

struct mlx90614_data {
	struct i2c_client *client;
};

static int mlx90614_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *channel, int *val,
			    int *val2, long mask)
{
	struct mlx90614_data *data = iio_priv(indio_dev);
	s32 ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
		switch (channel->channel2) {
		case IIO_MOD_TEMP_AMBIENT:
			ret = i2c_smbus_read_word_data(data->client,
			    MLX90614_TA);
			if (ret < 0)
				return ret;
			break;
		case IIO_MOD_TEMP_OBJECT:
			ret = i2c_smbus_read_word_data(data->client,
			    MLX90614_TOBJ1);
			if (ret < 0)
				return ret;
			break;
		default:
			return -EINVAL;
		}
		*val = ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_OFFSET:
		*val = 13657;
		*val2 = 500000;
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_SCALE:
		*val = 20;
		return IIO_VAL_INT;
	default:
		return -EINVAL;
	}
}

static const struct iio_chan_spec mlx90614_channels[] = {
	{
		.type = IIO_TEMP,
		.modified = 1,
		.channel2 = IIO_MOD_TEMP_AMBIENT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
		    BIT(IIO_CHAN_INFO_SCALE),
	},
	{
		.type = IIO_TEMP,
		.modified = 1,
		.channel2 = IIO_MOD_TEMP_OBJECT,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
		    BIT(IIO_CHAN_INFO_SCALE),
	},
};

static const struct iio_info mlx90614_info = {
	.read_raw = mlx90614_read_raw,
	.driver_module = THIS_MODULE,
};

static int mlx90614_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct iio_dev *indio_dev;
	struct mlx90614_data *data;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
		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 = id->name;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->info = &mlx90614_info;

	indio_dev->channels = mlx90614_channels;
	indio_dev->num_channels = ARRAY_SIZE(mlx90614_channels);

	return iio_device_register(indio_dev);
}

static int mlx90614_remove(struct i2c_client *client)
{
	iio_device_unregister(i2c_get_clientdata(client));

	return 0;
}

static const struct i2c_device_id mlx90614_id[] = {
	{ "mlx90614", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mlx90614_id);

static struct i2c_driver mlx90614_driver = {
	.driver = {
		.name	= "mlx90614",
		.owner	= THIS_MODULE,
	},
	.probe = mlx90614_probe,
	.remove = mlx90614_remove,
	.id_table = mlx90614_id,
};
module_i2c_driver(mlx90614_driver);

MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
474fe212 PM	1	/*
	2	* mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
	3	*
	4	* Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
	5	*
	6	* This file is subject to the terms and conditions of version 2 of
	7	* the GNU General Public License. See the file COPYING in the main
	8	* directory of this archive for more details.
	9	*
	10	* Driver for the Melexis MLX90614 I2C 16-bit IR thermopile sensor
	11	*
	12	* (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
	13	*
	14	* TODO: sleep mode, configuration EEPROM
	15	*/
	16
	17	#include <linux/err.h>
	18	#include <linux/i2c.h>
	19	#include <linux/module.h>
	20
	21	#include <linux/iio/iio.h>
	22
	23	#define MLX90614_OP_RAM 0x00
	24
	25	/* RAM offsets with 16-bit data, MSB first */
c7586584 VCSM	26	#define MLX90614_TA (MLX90614_OP_RAM \| 0x06) /* ambient temperature */
c7586584 VCSM	27	#define MLX90614_TOBJ1 (MLX90614_OP_RAM \| 0x07) /* object 1 temperature */
474fe212 PM	28
	29	struct mlx90614_data {
	30	struct i2c_client *client;
	31	};
	32
	33	static int mlx90614_read_raw(struct iio_dev *indio_dev,
	34	struct iio_chan_spec const channel, int val,
	35	int *val2, long mask)
	36	{
	37	struct mlx90614_data *data = iio_priv(indio_dev);
	38	s32 ret;
	39
	40	switch (mask) {
	41	case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
	42	switch (channel->channel2) {
	43	case IIO_MOD_TEMP_AMBIENT:
	44	ret = i2c_smbus_read_word_data(data->client,
c7586584	45	MLX90614_TA);
474fe212 PM	46	if (ret < 0)
	47	return ret;
	48	break;
	49	case IIO_MOD_TEMP_OBJECT:
	50	ret = i2c_smbus_read_word_data(data->client,
c7586584	51	MLX90614_TOBJ1);
474fe212 PM	52	if (ret < 0)
	53	return ret;
	54	break;
	55	default:
	56	return -EINVAL;
	57	}
	58	*val = ret;
	59	return IIO_VAL_INT;
	60	case IIO_CHAN_INFO_OFFSET:
	61	*val = 13657;
	62	*val2 = 500000;
	63	return IIO_VAL_INT_PLUS_MICRO;
	64	case IIO_CHAN_INFO_SCALE:
	65	*val = 20;
	66	return IIO_VAL_INT;
	67	default:
	68	return -EINVAL;
	69	}
	70	}
	71
	72	static const struct iio_chan_spec mlx90614_channels[] = {
	73	{
	74	.type = IIO_TEMP,
	75	.modified = 1,
	76	.channel2 = IIO_MOD_TEMP_AMBIENT,
	77	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	78	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) \|
	79	BIT(IIO_CHAN_INFO_SCALE),
	80	},
	81	{
	82	.type = IIO_TEMP,
	83	.modified = 1,
	84	.channel2 = IIO_MOD_TEMP_OBJECT,
	85	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
	86	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) \|
	87	BIT(IIO_CHAN_INFO_SCALE),
	88	},
	89	};
	90
	91	static const struct iio_info mlx90614_info = {
	92	.read_raw = mlx90614_read_raw,
	93	.driver_module = THIS_MODULE,
	94	};
	95
	96	static int mlx90614_probe(struct i2c_client *client,
	97	const struct i2c_device_id *id)
	98	{
	99	struct iio_dev *indio_dev;
	100	struct mlx90614_data *data;
	101
	102	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
	103	return -ENODEV;
	104
	105	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	106	if (!indio_dev)
	107	return -ENOMEM;
	108
	109	data = iio_priv(indio_dev);
	110	i2c_set_clientdata(client, indio_dev);
	111	data->client = client;
	112
	113	indio_dev->dev.parent = &client->dev;
	114	indio_dev->name = id->name;
	115	indio_dev->modes = INDIO_DIRECT_MODE;
116	indio_dev->info = &mlx90614_info;
117
118	indio_dev->channels = mlx90614_channels;
119	indio_dev->num_channels = ARRAY_SIZE(mlx90614_channels);
120
121	return iio_device_register(indio_dev);
122	}
123
124	static int mlx90614_remove(struct i2c_client *client)
125	{
126	iio_device_unregister(i2c_get_clientdata(client));
127
128	return 0;
129	}
130
131	static const struct i2c_device_id mlx90614_id[] = {
132	{ "mlx90614", 0 },
133	{ }
134	};
135	MODULE_DEVICE_TABLE(i2c, mlx90614_id);
136
137	static struct i2c_driver mlx90614_driver = {
138	.driver = {
139	.name = "mlx90614",
140	.owner = THIS_MODULE,
141	},
142	.probe = mlx90614_probe,
143	.remove = mlx90614_remove,
144	.id_table = mlx90614_id,
145	};
146	module_i2c_driver(mlx90614_driver);
147
148	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
149	MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
150	MODULE_LICENSE("GPL");