iio: humidity: Add support for ENS210
Add support for ENS210/ENS210A/ENS211/ENS212/ENS213A/ENS215. The ENS21x is a family of temperature and relative humidity sensors with accuracies tailored to the needs of specific applications. Signed-off-by: Joshua Felmeden <jfelmeden@thegoodpenguin.co.uk> Link: https://patch.msgid.link/20240805-ens21x-v6-2-5bb576ef26a6@thegoodpenguin.co.uk Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Joshua Felmeden
Jonathan Cameron
parent
6dde94264a
commit
c524fbca67
@ -25,6 +25,17 @@ config DHT11
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Other sensors should work as well as long as they speak the
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same protocol.
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config ENS210
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tristate "ENS210 temperature and humidity sensor"
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depends on I2C
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select CRC7
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help
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Say yes here to get support for the ScioSense ENS210 family of
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humidity and temperature sensors.
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This driver can also be built as a module. If so, the module will be
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called ens210.
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config HDC100X
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tristate "TI HDC100x relative humidity and temperature sensor"
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depends on I2C
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@ -5,6 +5,7 @@
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obj-$(CONFIG_AM2315) += am2315.o
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obj-$(CONFIG_DHT11) += dht11.o
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obj-$(CONFIG_ENS210) += ens210.o
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obj-$(CONFIG_HDC100X) += hdc100x.o
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obj-$(CONFIG_HDC2010) += hdc2010.o
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obj-$(CONFIG_HDC3020) += hdc3020.o
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339
drivers/iio/humidity/ens210.c
Normal file
339
drivers/iio/humidity/ens210.c
Normal file
@ -0,0 +1,339 @@
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* ens210.c - Support for ScioSense ens210 temperature & humidity sensor family
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*
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* (7-bit I2C slave address 0x43 ENS210)
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* (7-bit I2C slave address 0x43 ENS210A)
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* (7-bit I2C slave address 0x44 ENS211)
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* (7-bit I2C slave address 0x45 ENS212)
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* (7-bit I2C slave address 0x46 ENS213A)
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* (7-bit I2C slave address 0x47 ENS215)
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*
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* Datasheet:
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* https://www.sciosense.com/wp-content/uploads/2024/04/ENS21x-Datasheet.pdf
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* https://www.sciosense.com/wp-content/uploads/2023/12/ENS210-Datasheet.pdf
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*/
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#include <linux/crc7.h>
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#include <linux/delay.h>
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#include <linux/i2c.h>
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#include <linux/iio/iio.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <asm/unaligned.h>
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/* register definitions */
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#define ENS210_REG_PART_ID 0x00
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#define ENS210_REG_DIE_REV 0x02
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#define ENS210_REG_UID 0x04
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#define ENS210_REG_SYS_CTRL 0x10
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#define ENS210_REG_SYS_STAT 0x11
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#define ENS210_REG_SENS_RUN 0x21
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#define ENS210_REG_SENS_START 0x22
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#define ENS210_REG_SENS_STOP 0x23
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#define ENS210_REG_SENS_STAT 0x24
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#define ENS210_REG_T_VAL 0x30
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#define ENS210_REG_H_VAL 0x33
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/* value definitions */
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#define ENS210_SENS_START_T_START BIT(0)
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#define ENS210_SENS_START_H_START BIT(1)
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#define ENS210_SENS_STAT_T_ACTIVE BIT(0)
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#define ENS210_SENS_STAT_H_ACTIVE BIT(1)
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#define ENS210_SYS_CTRL_LOW_POWER_ENABLE BIT(0)
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#define ENS210_SYS_CTRL_SYS_RESET BIT(7)
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#define ENS210_SYS_STAT_SYS_ACTIVE BIT(0)
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enum ens210_partnumber {
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ENS210 = 0x0210,
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ENS210A = 0xa210,
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ENS211 = 0x0211,
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ENS212 = 0x0212,
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ENS213A = 0xa213,
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ENS215 = 0x0215,
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};
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/**
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* struct ens210_chip_info - Humidity/Temperature chip specific information
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* @name: name of device
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* @part_id: chip identifier
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* @conv_time_msec: time for conversion calculation in m/s
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*/
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struct ens210_chip_info {
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const char *name;
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enum ens210_partnumber part_id;
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unsigned int conv_time_msec;
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};
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/**
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* struct ens210_data - Humidity/Temperature sensor device structure
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* @client: i2c client
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* @chip_info: chip specific information
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* @lock: lock protecting against simultaneous callers of get_measurement
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* since multiple uninterrupted transactions are required
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*/
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struct ens210_data {
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struct i2c_client *client;
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const struct ens210_chip_info *chip_info;
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struct mutex lock;
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};
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/* calculate 17-bit crc7 */
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static u8 ens210_crc7(u32 val)
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{
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unsigned int val_be = (val & 0x1ffff) >> 0x8;
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return crc7_be(0xde, (u8 *)&val_be, 3) >> 1;
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}
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static int ens210_get_measurement(struct iio_dev *indio_dev, bool temp, int *val)
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{
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struct ens210_data *data = iio_priv(indio_dev);
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struct device *dev = &data->client->dev;
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u32 regval;
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u8 regval_le[3];
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int ret;
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/* assert read */
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ret = i2c_smbus_write_byte_data(data->client, ENS210_REG_SENS_START,
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temp ? ENS210_SENS_START_T_START :
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ENS210_SENS_START_H_START);
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if (ret)
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return ret;
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/* wait for conversion to be ready */
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msleep(data->chip_info->conv_time_msec);
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ret = i2c_smbus_read_byte_data(data->client, ENS210_REG_SENS_STAT);
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if (ret < 0)
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return ret;
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/* perform read */
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ret = i2c_smbus_read_i2c_block_data(
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data->client, temp ? ENS210_REG_T_VAL : ENS210_REG_H_VAL, 3,
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regval_le);
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if (ret < 0) {
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dev_err(dev, "failed to read register");
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return -EIO;
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}
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if (ret != 3) {
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dev_err(dev, "expected 3 bytes, received %d\n", ret);
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return -EIO;
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}
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regval = get_unaligned_le24(regval_le);
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if (ens210_crc7(regval) != ((regval >> 17) & 0x7f)) {
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dev_err(dev, "invalid crc\n");
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return -EIO;
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}
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if (!((regval >> 16) & 0x1)) {
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dev_err(dev, "data is not valid");
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return -EIO;
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}
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*val = regval & GENMASK(15, 0);
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return IIO_VAL_INT;
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}
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static int ens210_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 ens210_data *data = iio_priv(indio_dev);
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int ret;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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scoped_guard(mutex, &data->lock) {
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ret = ens210_get_measurement(
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indio_dev, channel->type == IIO_TEMP, val);
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if (ret)
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return ret;
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return IIO_VAL_INT;
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}
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return -EINVAL; /* compiler warning workaround */
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case IIO_CHAN_INFO_SCALE:
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if (channel->type == IIO_TEMP) {
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*val = 15;
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*val2 = 625000;
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} else {
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*val = 1;
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*val2 = 953125;
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}
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_OFFSET:
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*val = -17481;
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*val2 = 600000;
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return IIO_VAL_INT_PLUS_MICRO;
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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 ens210_channels[] = {
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_OFFSET),
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},
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{
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.type = IIO_HUMIDITYRELATIVE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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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 ens210_info = {
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.read_raw = ens210_read_raw,
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};
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static int ens210_probe(struct i2c_client *client)
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{
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struct ens210_data *data;
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struct iio_dev *indio_dev;
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uint16_t part_id;
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int ret;
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if (!i2c_check_functionality(client->adapter,
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I2C_FUNC_SMBUS_WRITE_BYTE_DATA |
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I2C_FUNC_SMBUS_WRITE_BYTE |
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I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
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return dev_err_probe(&client->dev, -EOPNOTSUPP,
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"adapter does not support some i2c transactions\n");
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}
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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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data->client = client;
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mutex_init(&data->lock);
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data->chip_info = i2c_get_match_data(client);
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ret = devm_regulator_get_enable(&client->dev, "vdd");
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if (ret)
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return ret;
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/* reset device */
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ret = i2c_smbus_write_byte_data(client, ENS210_REG_SYS_CTRL,
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ENS210_SYS_CTRL_SYS_RESET);
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if (ret)
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return ret;
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/* wait for device to become active */
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usleep_range(4000, 5000);
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/* disable low power mode */
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ret = i2c_smbus_write_byte_data(client, ENS210_REG_SYS_CTRL, 0x00);
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if (ret)
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return ret;
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/* wait for device to finish */
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usleep_range(4000, 5000);
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/* get part_id */
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ret = i2c_smbus_read_word_data(client, ENS210_REG_PART_ID);
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if (ret < 0)
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return ret;
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part_id = ret;
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if (part_id != data->chip_info->part_id) {
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dev_info(&client->dev,
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"Part ID does not match (0x%04x != 0x%04x)\n", part_id,
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data->chip_info->part_id);
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}
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/* reenable low power */
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ret = i2c_smbus_write_byte_data(client, ENS210_REG_SYS_CTRL,
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ENS210_SYS_CTRL_LOW_POWER_ENABLE);
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if (ret)
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return ret;
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indio_dev->name = data->chip_info->name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = ens210_channels;
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indio_dev->num_channels = ARRAY_SIZE(ens210_channels);
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indio_dev->info = &ens210_info;
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return devm_iio_device_register(&client->dev, indio_dev);
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}
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static const struct ens210_chip_info ens210_chip_info_data = {
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.name = "ens210",
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.part_id = ENS210,
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.conv_time_msec = 130,
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};
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static const struct ens210_chip_info ens210a_chip_info_data = {
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.name = "ens210a",
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.part_id = ENS210A,
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.conv_time_msec = 130,
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};
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static const struct ens210_chip_info ens211_chip_info_data = {
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.name = "ens211",
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.part_id = ENS211,
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.conv_time_msec = 32,
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};
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static const struct ens210_chip_info ens212_chip_info_data = {
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.name = "ens212",
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.part_id = ENS212,
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.conv_time_msec = 32,
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};
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static const struct ens210_chip_info ens213a_chip_info_data = {
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.name = "ens213a",
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.part_id = ENS213A,
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.conv_time_msec = 130,
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};
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static const struct ens210_chip_info ens215_chip_info_data = {
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.name = "ens215",
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.part_id = ENS215,
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.conv_time_msec = 130,
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};
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static const struct of_device_id ens210_of_match[] = {
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{ .compatible = "sciosense,ens210", .data = &ens210_chip_info_data },
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{ .compatible = "sciosense,ens210a", .data = &ens210a_chip_info_data },
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{ .compatible = "sciosense,ens211", .data = &ens211_chip_info_data },
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{ .compatible = "sciosense,ens212", .data = &ens212_chip_info_data },
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{ .compatible = "sciosense,ens213a", .data = &ens213a_chip_info_data },
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{ .compatible = "sciosense,ens215", .data = &ens215_chip_info_data },
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{ }
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};
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MODULE_DEVICE_TABLE(of, ens210_of_match);
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static const struct i2c_device_id ens210_id_table[] = {
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{ "ens210", (kernel_ulong_t)&ens210_chip_info_data },
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{ "ens210a", (kernel_ulong_t)&ens210a_chip_info_data },
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{ "ens211", (kernel_ulong_t)&ens211_chip_info_data },
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{ "ens212", (kernel_ulong_t)&ens212_chip_info_data },
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{ "ens213a", (kernel_ulong_t)&ens213a_chip_info_data },
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{ "ens215", (kernel_ulong_t)&ens215_chip_info_data },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, ens210_id_table);
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static struct i2c_driver ens210_driver = {
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.probe = ens210_probe,
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.id_table = ens210_id_table,
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.driver = {
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.name = "ens210",
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.of_match_table = ens210_of_match,
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},
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};
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module_i2c_driver(ens210_driver);
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MODULE_DESCRIPTION("ScioSense ENS210 temperature and humidity sensor driver");
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MODULE_AUTHOR("Joshua Felmeden <jfelmeden@thegoodpenguin.co.uk>");
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MODULE_LICENSE("GPL");
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