151 lines
3.6 KiB
C
151 lines
3.6 KiB
C
/*
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* mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
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*
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* Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*
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* Driver for the Melexis MLX90614 I2C 16-bit IR thermopile sensor
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*
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* (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
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*
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* TODO: sleep mode, configuration EEPROM
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#define MLX90614_OP_RAM 0x00
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/* RAM offsets with 16-bit data, MSB first */
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#define MLX90614_TA 0x06 /* ambient temperature */
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#define MLX90614_TOBJ1 0x07 /* object temperature */
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struct mlx90614_data {
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struct i2c_client *client;
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};
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static int mlx90614_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *channel, int *val,
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int *val2, long mask)
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{
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struct mlx90614_data *data = iio_priv(indio_dev);
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s32 ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
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switch (channel->channel2) {
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case IIO_MOD_TEMP_AMBIENT:
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ret = i2c_smbus_read_word_data(data->client,
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MLX90614_OP_RAM | MLX90614_TA);
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if (ret < 0)
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return ret;
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break;
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case IIO_MOD_TEMP_OBJECT:
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ret = i2c_smbus_read_word_data(data->client,
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MLX90614_OP_RAM | MLX90614_TOBJ1);
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if (ret < 0)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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*val = ret;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_OFFSET:
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*val = 13657;
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*val2 = 500000;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SCALE:
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*val = 20;
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return IIO_VAL_INT;
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default:
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return -EINVAL;
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}
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}
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static const struct iio_chan_spec mlx90614_channels[] = {
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{
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.type = IIO_TEMP,
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.modified = 1,
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.channel2 = IIO_MOD_TEMP_AMBIENT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE),
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},
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{
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.type = IIO_TEMP,
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.modified = 1,
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.channel2 = IIO_MOD_TEMP_OBJECT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE),
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},
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};
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static const struct iio_info mlx90614_info = {
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.read_raw = mlx90614_read_raw,
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.driver_module = THIS_MODULE,
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};
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static int mlx90614_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct iio_dev *indio_dev;
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struct mlx90614_data *data;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
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return -ENODEV;
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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indio_dev->dev.parent = &client->dev;
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indio_dev->name = id->name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &mlx90614_info;
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indio_dev->channels = mlx90614_channels;
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indio_dev->num_channels = ARRAY_SIZE(mlx90614_channels);
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return iio_device_register(indio_dev);
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}
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static int mlx90614_remove(struct i2c_client *client)
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{
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iio_device_unregister(i2c_get_clientdata(client));
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return 0;
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}
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static const struct i2c_device_id mlx90614_id[] = {
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{ "mlx90614", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, mlx90614_id);
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static struct i2c_driver mlx90614_driver = {
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.driver = {
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.name = "mlx90614",
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.owner = THIS_MODULE,
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},
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.probe = mlx90614_probe,
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.remove = mlx90614_remove,
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.id_table = mlx90614_id,
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};
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module_i2c_driver(mlx90614_driver);
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MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
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MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
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MODULE_LICENSE("GPL");
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