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-rw-r--r--drivers/iio/humidity/Kconfig23
-rw-r--r--drivers/iio/humidity/Makefile2
-rw-r--r--drivers/iio/humidity/hdc100x.c320
-rw-r--r--drivers/iio/humidity/htu21.c253
-rw-r--r--drivers/iio/humidity/si7020.c6
5 files changed, 603 insertions, 1 deletions
diff --git a/drivers/iio/humidity/Kconfig b/drivers/iio/humidity/Kconfig
index 688c0d1cb47d..6a23698d347c 100644
--- a/drivers/iio/humidity/Kconfig
+++ b/drivers/iio/humidity/Kconfig
@@ -12,6 +12,29 @@ config DHT11
Other sensors should work as well as long as they speak the
same protocol.
+config HDC100X
+ tristate "TI HDC100x relative humidity and temperature sensor"
+ depends on I2C
+ help
+ Say yes here to build support for the TI HDC100x series of
+ relative humidity and temperature sensors.
+
+ To compile this driver as a module, choose M here: the module
+ will be called hdc100x.
+
+config HTU21
+ tristate "Measurement Specialties HTU21 humidity & temperature sensor"
+ depends on I2C
+ select IIO_MS_SENSORS_I2C
+ help
+ If you say yes here you get support for the Measurement Specialties
+ HTU21 humidity and temperature sensor.
+ This driver is also used for MS8607 temperature, pressure & humidity
+ sensor
+
+ This driver can also be built as a module. If so, the module will
+ be called htu21.
+
config SI7005
tristate "SI7005 relative humidity and temperature sensor"
depends on I2C
diff --git a/drivers/iio/humidity/Makefile b/drivers/iio/humidity/Makefile
index 86e2d26e9f4d..c9f089a9a6b8 100644
--- a/drivers/iio/humidity/Makefile
+++ b/drivers/iio/humidity/Makefile
@@ -3,5 +3,7 @@
#
obj-$(CONFIG_DHT11) += dht11.o
+obj-$(CONFIG_HDC100X) += hdc100x.o
+obj-$(CONFIG_HTU21) += htu21.o
obj-$(CONFIG_SI7005) += si7005.o
obj-$(CONFIG_SI7020) += si7020.o
diff --git a/drivers/iio/humidity/hdc100x.c b/drivers/iio/humidity/hdc100x.c
new file mode 100644
index 000000000000..a7f61e881a49
--- /dev/null
+++ b/drivers/iio/humidity/hdc100x.c
@@ -0,0 +1,320 @@
+/*
+ * hdc100x.c - Support for the TI HDC100x temperature + humidity sensors
+ *
+ * Copyright (C) 2015 Matt Ranostay <mranostay@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define HDC100X_REG_TEMP 0x00
+#define HDC100X_REG_HUMIDITY 0x01
+
+#define HDC100X_REG_CONFIG 0x02
+#define HDC100X_REG_CONFIG_HEATER_EN BIT(13)
+
+struct hdc100x_data {
+ struct i2c_client *client;
+ struct mutex lock;
+ u16 config;
+
+ /* integration time of the sensor */
+ int adc_int_us[2];
+};
+
+/* integration time in us */
+static const int hdc100x_int_time[][3] = {
+ { 6350, 3650, 0 }, /* IIO_TEMP channel*/
+ { 6500, 3850, 2500 }, /* IIO_HUMIDITYRELATIVE channel */
+};
+
+/* HDC100X_REG_CONFIG shift and mask values */
+static const struct {
+ int shift;
+ int mask;
+} hdc100x_resolution_shift[2] = {
+ { /* IIO_TEMP channel */
+ .shift = 10,
+ .mask = 1
+ },
+ { /* IIO_HUMIDITYRELATIVE channel */
+ .shift = 8,
+ .mask = 2,
+ },
+};
+
+static IIO_CONST_ATTR(temp_integration_time_available,
+ "0.00365 0.00635");
+
+static IIO_CONST_ATTR(humidityrelative_integration_time_available,
+ "0.0025 0.00385 0.0065");
+
+static IIO_CONST_ATTR(out_current_heater_raw_available,
+ "0 1");
+
+static struct attribute *hdc100x_attributes[] = {
+ &iio_const_attr_temp_integration_time_available.dev_attr.attr,
+ &iio_const_attr_humidityrelative_integration_time_available.dev_attr.attr,
+ &iio_const_attr_out_current_heater_raw_available.dev_attr.attr,
+ NULL
+};
+
+static struct attribute_group hdc100x_attribute_group = {
+ .attrs = hdc100x_attributes,
+};
+
+static const struct iio_chan_spec hdc100x_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .address = HDC100X_REG_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_INT_TIME) |
+ BIT(IIO_CHAN_INFO_OFFSET),
+ },
+ {
+ .type = IIO_HUMIDITYRELATIVE,
+ .address = HDC100X_REG_HUMIDITY,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_INT_TIME)
+ },
+ {
+ .type = IIO_CURRENT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .extend_name = "heater",
+ .output = 1,
+ },
+};
+
+static int hdc100x_update_config(struct hdc100x_data *data, int mask, int val)
+{
+ int tmp = (~mask & data->config) | val;
+ int ret;
+
+ ret = i2c_smbus_write_word_swapped(data->client,
+ HDC100X_REG_CONFIG, tmp);
+ if (!ret)
+ data->config = tmp;
+
+ return ret;
+}
+
+static int hdc100x_set_it_time(struct hdc100x_data *data, int chan, int val2)
+{
+ int shift = hdc100x_resolution_shift[chan].shift;
+ int ret = -EINVAL;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(hdc100x_int_time[chan]); i++) {
+ if (val2 && val2 == hdc100x_int_time[chan][i]) {
+ ret = hdc100x_update_config(data,
+ hdc100x_resolution_shift[chan].mask << shift,
+ i << shift);
+ if (!ret)
+ data->adc_int_us[chan] = val2;
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static int hdc100x_get_measurement(struct hdc100x_data *data,
+ struct iio_chan_spec const *chan)
+{
+ struct i2c_client *client = data->client;
+ int delay = data->adc_int_us[chan->address];
+ int ret;
+ int val;
+
+ /* start measurement */
+ ret = i2c_smbus_write_byte(client, chan->address);
+ if (ret < 0) {
+ dev_err(&client->dev, "cannot start measurement");
+ return ret;
+ }
+
+ /* wait for integration time to pass */
+ usleep_range(delay, delay + 1000);
+
+ /*
+ * i2c_smbus_read_word_data cannot() be used here due to the command
+ * value not being understood and causes NAKs preventing any reading
+ * from being accessed.
+ */
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "cannot read high byte measurement");
+ return ret;
+ }
+ val = ret << 6;
+
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0) {
+ dev_err(&client->dev, "cannot read low byte measurement");
+ return ret;
+ }
+ val |= ret >> 2;
+
+ return val;
+}
+
+static int hdc100x_get_heater_status(struct hdc100x_data *data)
+{
+ return !!(data->config & HDC100X_REG_CONFIG_HEATER_EN);
+}
+
+static int hdc100x_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct hdc100x_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW: {
+ int ret;
+
+ mutex_lock(&data->lock);
+ if (chan->type == IIO_CURRENT) {
+ *val = hdc100x_get_heater_status(data);
+ ret = IIO_VAL_INT;
+ } else {
+ ret = hdc100x_get_measurement(data, chan);
+ if (ret >= 0) {
+ *val = ret;
+ ret = IIO_VAL_INT;
+ }
+ }
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+ case IIO_CHAN_INFO_INT_TIME:
+ *val = 0;
+ *val2 = data->adc_int_us[chan->address];
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CHAN_INFO_SCALE:
+ if (chan->type == IIO_TEMP) {
+ *val = 165;
+ *val2 = 65536 >> 2;
+ return IIO_VAL_FRACTIONAL;
+ } else {
+ *val = 0;
+ *val2 = 10000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+ *val = -3971;
+ *val2 = 879096;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int hdc100x_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct hdc100x_data *data = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_INT_TIME:
+ if (val != 0)
+ return -EINVAL;
+
+ mutex_lock(&data->lock);
+ ret = hdc100x_set_it_time(data, chan->address, val2);
+ mutex_unlock(&data->lock);
+ return ret;
+ case IIO_CHAN_INFO_RAW:
+ if (chan->type != IIO_CURRENT || val2 != 0)
+ return -EINVAL;
+
+ mutex_lock(&data->lock);
+ ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_HEATER_EN,
+ val ? HDC100X_REG_CONFIG_HEATER_EN : 0);
+ mutex_unlock(&data->lock);
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info hdc100x_info = {
+ .read_raw = hdc100x_read_raw,
+ .write_raw = hdc100x_write_raw,
+ .attrs = &hdc100x_attribute_group,
+ .driver_module = THIS_MODULE,
+};
+
+static int hdc100x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct iio_dev *indio_dev;
+ struct hdc100x_data *data;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BYTE))
+ 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;
+ mutex_init(&data->lock);
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->name = dev_name(&client->dev);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &hdc100x_info;
+
+ indio_dev->channels = hdc100x_channels;
+ indio_dev->num_channels = ARRAY_SIZE(hdc100x_channels);
+
+ /* be sure we are in a known state */
+ hdc100x_set_it_time(data, 0, hdc100x_int_time[0][0]);
+ hdc100x_set_it_time(data, 1, hdc100x_int_time[1][0]);
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id hdc100x_id[] = {
+ { "hdc100x", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, hdc100x_id);
+
+static struct i2c_driver hdc100x_driver = {
+ .driver = {
+ .name = "hdc100x",
+ },
+ .probe = hdc100x_probe,
+ .id_table = hdc100x_id,
+};
+module_i2c_driver(hdc100x_driver);
+
+MODULE_AUTHOR("Matt Ranostay <mranostay@gmail.com>");
+MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/humidity/htu21.c b/drivers/iio/humidity/htu21.c
new file mode 100644
index 000000000000..d1636a74980e
--- /dev/null
+++ b/drivers/iio/humidity/htu21.c
@@ -0,0 +1,253 @@
+/*
+ * htu21.c - Support for Measurement-Specialties
+ * htu21 temperature & humidity sensor
+ * and humidity part of MS8607 sensor
+ *
+ * Copyright (c) 2014 Measurement-Specialties
+ *
+ * Licensed under the GPL-2.
+ *
+ * (7-bit I2C slave address 0x40)
+ *
+ * Datasheet:
+ * http://www.meas-spec.com/downloads/HTU21D.pdf
+ * Datasheet:
+ * http://www.meas-spec.com/downloads/MS8607-02BA01.pdf
+ */
+
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/stat.h>
+#include <linux/module.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "../common/ms_sensors/ms_sensors_i2c.h"
+
+#define HTU21_RESET 0xFE
+
+enum {
+ HTU21,
+ MS8607
+};
+
+static const int htu21_samp_freq[4] = { 20, 40, 70, 120 };
+/* String copy of the above const for readability purpose */
+static const char htu21_show_samp_freq[] = "20 40 70 120";
+
+static int htu21_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ int ret, temperature;
+ unsigned int humidity;
+ struct ms_ht_dev *dev_data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (channel->type) {
+ case IIO_TEMP: /* in milli °C */
+ ret = ms_sensors_ht_read_temperature(dev_data,
+ &temperature);
+ if (ret)
+ return ret;
+ *val = temperature;
+
+ return IIO_VAL_INT;
+ case IIO_HUMIDITYRELATIVE: /* in milli %RH */
+ ret = ms_sensors_ht_read_humidity(dev_data,
+ &humidity);
+ if (ret)
+ return ret;
+ *val = humidity;
+
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *val = htu21_samp_freq[dev_data->res_index];
+
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int htu21_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct ms_ht_dev *dev_data = iio_priv(indio_dev);
+ int i, ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ i = ARRAY_SIZE(htu21_samp_freq);
+ while (i-- > 0)
+ if (val == htu21_samp_freq[i])
+ break;
+ if (i < 0)
+ return -EINVAL;
+ mutex_lock(&dev_data->lock);
+ dev_data->res_index = i;
+ ret = ms_sensors_write_resolution(dev_data, i);
+ mutex_unlock(&dev_data->lock);
+
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_chan_spec htu21_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ },
+ {
+ .type = IIO_HUMIDITYRELATIVE,
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ }
+};
+
+/*
+ * Meas Spec recommendation is to not read temperature
+ * on this driver part for MS8607
+ */
+static const struct iio_chan_spec ms8607_channels[] = {
+ {
+ .type = IIO_HUMIDITYRELATIVE,
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_PROCESSED),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ }
+};
+
+static ssize_t htu21_show_battery_low(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ms_ht_dev *dev_data = iio_priv(indio_dev);
+
+ return ms_sensors_show_battery_low(dev_data, buf);
+}
+
+static ssize_t htu21_show_heater(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ms_ht_dev *dev_data = iio_priv(indio_dev);
+
+ return ms_sensors_show_heater(dev_data, buf);
+}
+
+static ssize_t htu21_write_heater(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct ms_ht_dev *dev_data = iio_priv(indio_dev);
+
+ return ms_sensors_write_heater(dev_data, buf, len);
+}
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(htu21_show_samp_freq);
+static IIO_DEVICE_ATTR(battery_low, S_IRUGO,
+ htu21_show_battery_low, NULL, 0);
+static IIO_DEVICE_ATTR(heater_enable, S_IRUGO | S_IWUSR,
+ htu21_show_heater, htu21_write_heater, 0);
+
+static struct attribute *htu21_attributes[] = {
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_dev_attr_battery_low.dev_attr.attr,
+ &iio_dev_attr_heater_enable.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group htu21_attribute_group = {
+ .attrs = htu21_attributes,
+};
+
+static const struct iio_info htu21_info = {
+ .read_raw = htu21_read_raw,
+ .write_raw = htu21_write_raw,
+ .attrs = &htu21_attribute_group,
+ .driver_module = THIS_MODULE,
+};
+
+static int htu21_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct ms_ht_dev *dev_data;
+ struct iio_dev *indio_dev;
+ int ret;
+ u64 serial_number;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
+ I2C_FUNC_SMBUS_WRITE_BYTE |
+ I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
+ dev_err(&client->dev,
+ "Adapter does not support some i2c transaction\n");
+ return -ENODEV;
+ }
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ dev_data = iio_priv(indio_dev);
+ dev_data->client = client;
+ dev_data->res_index = 0;
+ mutex_init(&dev_data->lock);
+
+ indio_dev->info = &htu21_info;
+ indio_dev->name = id->name;
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ if (id->driver_data == MS8607) {
+ indio_dev->channels = ms8607_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ms8607_channels);
+ } else {
+ indio_dev->channels = htu21_channels;
+ indio_dev->num_channels = ARRAY_SIZE(htu21_channels);
+ }
+
+ i2c_set_clientdata(client, indio_dev);
+
+ ret = ms_sensors_reset(client, HTU21_RESET, 15000);
+ if (ret)
+ return ret;
+
+ ret = ms_sensors_read_serial(client, &serial_number);
+ if (ret)
+ return ret;
+ dev_info(&client->dev, "Serial number : %llx", serial_number);
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id htu21_id[] = {
+ {"htu21", HTU21},
+ {"ms8607-humidity", MS8607},
+ {}
+};
+
+static struct i2c_driver htu21_driver = {
+ .probe = htu21_probe,
+ .id_table = htu21_id,
+ .driver = {
+ .name = "htu21",
+ },
+};
+
+module_i2c_driver(htu21_driver);
+
+MODULE_DESCRIPTION("Measurement-Specialties htu21 temperature and humidity driver");
+MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
+MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/humidity/si7020.c b/drivers/iio/humidity/si7020.c
index fa3b809aff5e..12128d1ca570 100644
--- a/drivers/iio/humidity/si7020.c
+++ b/drivers/iio/humidity/si7020.c
@@ -57,8 +57,12 @@ static int si7020_read_raw(struct iio_dev *indio_dev,
if (ret < 0)
return ret;
*val = ret >> 2;
+ /*
+ * Humidity values can slightly exceed the 0-100%RH
+ * range and should be corrected by software
+ */
if (chan->type == IIO_HUMIDITYRELATIVE)
- *val &= GENMASK(11, 0);
+ *val = clamp_val(*val, 786, 13893);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
if (chan->type == IIO_TEMP)
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-30 02:03:39 +0300