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Subject[PATCH] iio: Add TH06 Humidity and Temperature sensor driver
Date
Add implementation for Hoperf TH06 Humidity and Temperature
sensor driver.

Datasheet: http://www.hoperf.com/upload/sensor/TH06_Module_v01.pdf

Signed-off-by: Cristina Moraru <cristina.moraru09@gmail.com>
---
drivers/iio/humidity/Kconfig | 10 +++
drivers/iio/humidity/Makefile | 1 +
drivers/iio/humidity/th06.c | 147 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 158 insertions(+)
create mode 100644 drivers/iio/humidity/th06.c

diff --git a/drivers/iio/humidity/Kconfig b/drivers/iio/humidity/Kconfig
index 6a23698..b233b16 100644
--- a/drivers/iio/humidity/Kconfig
+++ b/drivers/iio/humidity/Kconfig
@@ -55,4 +55,14 @@ config SI7020
To compile this driver as a module, choose M here: the module
will be called si7020.

+config TH06
+ tristate "TH06 humidity and temperature sensor"
+ depends on I2C
+ help
+ Say yes here to build support for the TH06 measurement of
+ relative humidity and temperature.
+
+ To compile this driver as a module, choose M here: the module
+ will be called th06.
+
endmenu
diff --git a/drivers/iio/humidity/Makefile b/drivers/iio/humidity/Makefile
index c9f089a..3667ee7 100644
--- a/drivers/iio/humidity/Makefile
+++ b/drivers/iio/humidity/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_HDC100X) += hdc100x.o
obj-$(CONFIG_HTU21) += htu21.o
obj-$(CONFIG_SI7005) += si7005.o
obj-$(CONFIG_SI7020) += si7020.o
+obj-$(CONFIG_TH06) += th06.o
diff --git a/drivers/iio/humidity/th06.c b/drivers/iio/humidity/th06.c
new file mode 100644
index 0000000..44b0d77
--- /dev/null
+++ b/drivers/iio/humidity/th06.c
@@ -0,0 +1,147 @@
+/*
+ * TH06 - I2C Humidity and Temperature Sensor
+ *
+ * Copyright (C) 2016 Cristina Moraru <cristina.moraru09@gmail.com>
+ *
+ * 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.
+ *
+ * IIO driver for TH06 (7-bit I2C slave address 0x40)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define TH06_DRV_NAME "th06"
+
+#define TH06_READ_RH 0xE5
+#define TH06_READ_TEMP 0xE3
+
+struct th06_data {
+ struct i2c_client *client;
+};
+
+static const struct iio_chan_spec th06_channels[] = {
+ {
+ .type = IIO_HUMIDITYRELATIVE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OFFSET),
+ },
+ {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_OFFSET),
+ }
+};
+
+static int th06_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct th06_data *data = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->type) {
+ case IIO_HUMIDITYRELATIVE:
+ ret = i2c_smbus_read_word_swapped(data->client,
+ TH06_READ_RH);
+ break;
+ case IIO_TEMP:
+ ret = i2c_smbus_read_word_swapped(data->client,
+ TH06_READ_TEMP);
+ break;
+ default:
+ break;
+ }
+ if (ret < 0)
+ return ret;
+ *val = ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_HUMIDITYRELATIVE:
+ *val = 0;
+ *val2 = 1907349;
+ break;
+ case IIO_TEMP:
+ *val = 0;
+ *val2 = 2681274;
+ break;
+ default:
+ break;
+ }
+ return IIO_VAL_INT_PLUS_NANO;
+ case IIO_CHAN_INFO_OFFSET:
+ switch (chan->type) {
+ case IIO_HUMIDITYRELATIVE:
+ *val = -6;
+ return IIO_VAL_INT;
+ case IIO_TEMP:
+ *val = -46;
+ *val2 = 850000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ break;
+ }
+ }
+ return ret;
+}
+
+
+static const struct iio_info th06_info = {
+ .driver_module = THIS_MODULE,
+ .read_raw = th06_read_raw,
+};
+
+static int th06_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct th06_data *data;
+ struct iio_dev *indio_dev;
+
+ 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->info = &th06_info;
+ indio_dev->name = TH06_DRV_NAME;
+ indio_dev->channels = th06_channels;
+ indio_dev->num_channels = ARRAY_SIZE(th06_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id th06_id[] = {
+ {"th06", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, th06_id);
+
+static struct i2c_driver th06_driver = {
+ .driver = {
+ .name = TH06_DRV_NAME,
+ },
+ .probe = th06_probe,
+ .id_table = th06_id,
+};
+
+module_i2c_driver(th06_driver);
+
+MODULE_AUTHOR("Cristina Moraru <cristina.moraru09@gmail.com>");
+MODULE_DESCRIPTION("TH06 Humidity and Temperature Sensor");
+MODULE_LICENSE("GPL");
--
1.9.1
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