On 02/05/14 16:57, Peter Meerwald wrote:
I2C-controlled sensor measures ambient and object temperatuer
see
http://www.melexis.com/Infrared-Thermometer-Sensors/Infrared-Thermometer-Sensors/MLX90614-615.aspx
Signed-off-by: Peter Meerwald <pmeerw@xxxxxxxxxx>
Another nice short excelent driver.
Applied to the togreg branch of iio.git initially pushed out as testing
for the autobuilders to play.
J
---
drivers/iio/temperature/Kconfig | 10 +++
drivers/iio/temperature/Makefile | 1 +
drivers/iio/temperature/mlx90614.c | 150 +++++++++++++++++++++++++++++++++++++
3 files changed, 161 insertions(+)
create mode 100644 drivers/iio/temperature/mlx90614.c
diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig
index 372f8fb..21feaa4 100644
--- a/drivers/iio/temperature/Kconfig
+++ b/drivers/iio/temperature/Kconfig
@@ -3,6 +3,16 @@
#
menu "Temperature sensors"
+config MLX90614
+ tristate "MLX90614 contact-less infrared sensor"
+ depends on I2C
+ help
+ If you say yes here you get support for the Melexis
+ MLX90614 contact-less infrared sensor connected with I2C.
+
+ This driver can also be built as a module. If so, the module will
+ be called mlx90614.
+
config TMP006
tristate "TMP006 infrared thermopile sensor"
depends on I2C
diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile
index 24d7b60..40710a8 100644
--- a/drivers/iio/temperature/Makefile
+++ b/drivers/iio/temperature/Makefile
@@ -2,4 +2,5 @@
# Makefile for industrial I/O temperature drivers
#
+obj-$(CONFIG_MLX90614) += mlx90614.o
obj-$(CONFIG_TMP006) += tmp006.o
diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c
new file mode 100644
index 0000000..c8b6ac8
--- /dev/null
+++ b/drivers/iio/temperature/mlx90614.c
@@ -0,0 +1,150 @@
+/*
+ * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor
+ *
+ * Copyright (c) 2014 Peter Meerwald <pmeerw@xxxxxxxxxx>
+ *
+ * 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 0x06 /* ambient temperature */
+#define MLX90614_TOBJ1 0x07 /* object 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_OP_RAM | MLX90614_TA);
+ if (ret < 0)
+ return ret;
+ break;
+ case IIO_MOD_TEMP_OBJECT:
+ ret = i2c_smbus_read_word_data(data->client,
+ MLX90614_OP_RAM | 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@xxxxxxxxxx>");
+MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
+MODULE_LICENSE("GPL");
--
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