ScioSense ENS160 is a digital metal oxide multi-gas sensor, designed for indoor air quality monitoring. The driver supports readings of CO2 and VOC, and can be accessed via both SPI and I2C. Signed-off-by: Gustavo Silva <gustavograzs@xxxxxxxxx> --- drivers/iio/chemical/Kconfig | 22 +++ drivers/iio/chemical/Makefile | 3 + drivers/iio/chemical/ens160.h | 9 ++ drivers/iio/chemical/ens160_core.c | 227 +++++++++++++++++++++++++++++ drivers/iio/chemical/ens160_i2c.c | 68 +++++++++ drivers/iio/chemical/ens160_spi.c | 69 +++++++++ 6 files changed, 398 insertions(+) create mode 100644 drivers/iio/chemical/ens160.h create mode 100644 drivers/iio/chemical/ens160_core.c create mode 100644 drivers/iio/chemical/ens160_i2c.c create mode 100644 drivers/iio/chemical/ens160_spi.c diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig index 02649ab81..e407afab8 100644 --- a/drivers/iio/chemical/Kconfig +++ b/drivers/iio/chemical/Kconfig @@ -76,6 +76,28 @@ config CCS811 Say Y here to build I2C interface support for the AMS CCS811 VOC (Volatile Organic Compounds) sensor +config ENS160 + tristate "ScioSense ENS160 sensor driver" + depends on (I2C || SPI) + select REGMAP + select ENS160_I2C if I2C + select ENS160_SPI if SPI + help + Say yes here to build support for ScioSense ENS160 multi-gas sensor. + + This driver can also be built as a module. If so, the module for I2C + would be called ens160_i2c and ens160_spi for SPI support. + +config ENS160_I2C + tristate + depends on I2C && ENS160 + select REGMAP_I2C + +config ENS160_SPI + tristate + depends on SPI && ENS160 + select REGMAP_SPI + config IAQCORE tristate "AMS iAQ-Core VOC sensors" depends on I2C diff --git a/drivers/iio/chemical/Makefile b/drivers/iio/chemical/Makefile index 2f3dee8bb..4866db06b 100644 --- a/drivers/iio/chemical/Makefile +++ b/drivers/iio/chemical/Makefile @@ -11,6 +11,9 @@ obj-$(CONFIG_BME680) += bme680_core.o obj-$(CONFIG_BME680_I2C) += bme680_i2c.o obj-$(CONFIG_BME680_SPI) += bme680_spi.o obj-$(CONFIG_CCS811) += ccs811.o +obj-$(CONFIG_ENS160) += ens160_core.o +obj-$(CONFIG_ENS160_I2C) += ens160_i2c.o +obj-$(CONFIG_ENS160_SPI) += ens160_spi.o obj-$(CONFIG_IAQCORE) += ams-iaq-core.o obj-$(CONFIG_PMS7003) += pms7003.o obj-$(CONFIG_SCD30_CORE) += scd30_core.o diff --git a/drivers/iio/chemical/ens160.h b/drivers/iio/chemical/ens160.h new file mode 100644 index 000000000..3fd079bc4 --- /dev/null +++ b/drivers/iio/chemical/ens160.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef ENS160_H_ +#define ENS160_H_ + +int ens160_core_probe(struct device *dev, struct regmap *regmap, + const char *name); +void ens160_core_remove(struct device *dev); + +#endif diff --git a/drivers/iio/chemical/ens160_core.c b/drivers/iio/chemical/ens160_core.c new file mode 100644 index 000000000..25593420d --- /dev/null +++ b/drivers/iio/chemical/ens160_core.c @@ -0,0 +1,227 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ScioSense ENS160 multi-gas sensor driver + * + * Copyright (c) 2024 Gustavo Silva <gustavograzs@xxxxxxxxx> + * + * Data sheet: + * https://www.sciosense.com/wp-content/uploads/2023/12/ENS160-Datasheet.pdf + * + */ + +#include <linux/bitfield.h> +#include <linux/iio/iio.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#include "ens160.h" + +#define ENS160_PART_ID 0x160 + +#define ENS160_BOOTING_TIME_MS 10U + +#define ENS160_REG_PART_ID 0x00 + +#define ENS160_REG_OPMODE 0x10 + +#define ENS160_REG_MODE_DEEP_SLEEP 0x00 +#define ENS160_REG_MODE_IDLE 0x01 +#define ENS160_REG_MODE_STANDARD 0x02 +#define ENS160_REG_MODE_RESET 0xF0 + +#define ENS160_REG_COMMAND 0x12 +#define ENS160_REG_COMMAND_GET_APPVER 0x0E +#define ENS160_REG_COMMAND_CLRGPR 0xCC + +#define ENS160_REG_TEMP_IN 0x13 +#define ENS160_REG_RH_IN 0x15 +#define ENS160_REG_DEVICE_STATUS 0x20 +#define ENS160_REG_DATA_TVOC 0x22 +#define ENS160_REG_DATA_ECO2 0x24 +#define ENS160_REG_DATA_T 0x30 +#define ENS160_REG_DATA_RH 0x32 +#define ENS160_REG_GPR_READ4 0x4C + +#define ENS160_STATUS_VALIDITY_FLAG GENMASK(3, 2) + +#define ENS160_STATUS_NORMAL 0x00 + +struct ens160_data { + struct regmap *regmap; +}; + +static const struct iio_chan_spec ens160_channels[] = { + { + .type = IIO_CONCENTRATION, + .channel2 = IIO_MOD_VOC, + .modified = 1, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .address = ENS160_REG_DATA_TVOC, + }, + { + .type = IIO_CONCENTRATION, + .channel2 = IIO_MOD_CO2, + .modified = 1, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE), + .address = ENS160_REG_DATA_ECO2, + }, +}; + +static int ens160_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct ens160_data *data = iio_priv(indio_dev); + __le16 buf; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_RAW: + ret = regmap_bulk_read(data->regmap, chan->address, + &buf, sizeof(buf)); + if (ret) + return ret; + *val = le16_to_cpu(buf); + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + switch (chan->channel2) { + case IIO_MOD_CO2: + /* The sensor reads CO2 data as ppm */ + *val = 0; + *val2 = 100; + return IIO_VAL_INT_PLUS_MICRO; + case IIO_MOD_VOC: + /* The sensor reads VOC data as ppb */ + *val = 0; + *val2 = 100; + return IIO_VAL_INT_PLUS_NANO; + } + } + + return -EINVAL; +} + +static int ens160_set_mode(struct ens160_data *data, u8 mode) +{ + int ret; + + ret = regmap_write(data->regmap, ENS160_REG_OPMODE, mode); + if (ret) + return ret; + + msleep(ENS160_BOOTING_TIME_MS); + + return 0; +} + +static int ens160_chip_init(struct ens160_data *data) +{ + struct device *dev = regmap_get_device(data->regmap); + u8 fw_version[3]; + __le16 part_id; + unsigned int status; + int ret; + + ret = ens160_set_mode(data, ENS160_REG_MODE_RESET); + if (ret) + return ret; + + ret = regmap_bulk_read(data->regmap, ENS160_REG_PART_ID, &part_id, + sizeof(part_id)); + if (ret) + return ret; + + if (le16_to_cpu(part_id) != ENS160_PART_ID) + return -ENODEV; + + ret = ens160_set_mode(data, ENS160_REG_MODE_IDLE); + if (ret) + return ret; + + ret = regmap_write(data->regmap, ENS160_REG_COMMAND, + ENS160_REG_COMMAND_CLRGPR); + if (ret) + return ret; + + ret = regmap_write(data->regmap, ENS160_REG_COMMAND, + ENS160_REG_COMMAND_GET_APPVER); + if (ret) + return ret; + + msleep(ENS160_BOOTING_TIME_MS); + + ret = regmap_bulk_read(data->regmap, ENS160_REG_GPR_READ4, + fw_version, sizeof(fw_version)); + if (ret) + return ret; + + msleep(ENS160_BOOTING_TIME_MS); + + dev_info(dev, "firmware version: %u.%u.%u\n", fw_version[2], + fw_version[1], fw_version[0]); + + ret = ens160_set_mode(data, ENS160_REG_MODE_STANDARD); + if (ret) + return ret; + + ret = regmap_read(data->regmap, ENS160_REG_DEVICE_STATUS, &status); + if (ret) + return ret; + + if (FIELD_GET(ENS160_STATUS_VALIDITY_FLAG, status) + != ENS160_STATUS_NORMAL) + return -EINVAL; + + return 0; +} + +static const struct iio_info ens160_info = { + .read_raw = ens160_read_raw, +}; + +int ens160_core_probe(struct device *dev, struct regmap *regmap, + const char *name) +{ + struct ens160_data *data; + struct iio_dev *indio_dev; + int ret; + + indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); + if (!indio_dev) + return -ENOMEM; + + data = iio_priv(indio_dev); + dev_set_drvdata(dev, indio_dev); + data->regmap = regmap; + + indio_dev->name = name; + indio_dev->info = &ens160_info; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = ens160_channels; + indio_dev->num_channels = ARRAY_SIZE(ens160_channels); + + ret = ens160_chip_init(data); + if (ret) { + dev_err_probe(dev, ret, "chip initialization failed\n"); + return ret; + } + + return devm_iio_device_register(dev, indio_dev); +} +EXPORT_SYMBOL_NS(ens160_core_probe, IIO_ENS160); + +void ens160_core_remove(struct device *dev) +{ + struct iio_dev *indio_dev = dev_get_drvdata(dev); + struct ens160_data *data = iio_priv(indio_dev); + + ens160_set_mode(data, ENS160_REG_MODE_IDLE); +} +EXPORT_SYMBOL_NS(ens160_core_remove, IIO_ENS160); + +MODULE_AUTHOR("Gustavo Silva <gustavograzs@xxxxxxxxx>"); +MODULE_DESCRIPTION("ScioSense ENS160 driver"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/iio/chemical/ens160_i2c.c b/drivers/iio/chemical/ens160_i2c.c new file mode 100644 index 000000000..ee2b44184 --- /dev/null +++ b/drivers/iio/chemical/ens160_i2c.c @@ -0,0 +1,68 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ScioSense ENS160 multi-gas sensor I2C driver + * + * Copyright (c) 2024 Gustavo Silva <gustavograzs@xxxxxxxxx> + * + * 7-Bit I2C slave address is: + * - 0x52 if ADDR pin LOW + * - 0x53 if ADDR pin HIGH + */ + +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#include "ens160.h" + +static const struct regmap_config ens160_regmap_i2c_conf = { + .reg_bits = 8, + .val_bits = 8, +}; + +static int ens160_i2c_probe(struct i2c_client *client) +{ + struct regmap *regmap; + + regmap = devm_regmap_init_i2c(client, &ens160_regmap_i2c_conf); + if (IS_ERR(regmap)) { + dev_err(&client->dev, "Failed to register i2c regmap %ld\n", + PTR_ERR(regmap)); + return PTR_ERR(regmap); + } + + return ens160_core_probe(&client->dev, regmap, client->name); +} + +static void ens160_i2c_remove(struct i2c_client *client) +{ + ens160_core_remove(&client->dev); +} + +static const struct i2c_device_id ens160_i2c_id[] = { + { "ens160", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ens160_i2c_id); + +static const struct of_device_id ens160_of_i2c_match[] = { + { .compatible = "sciosense,ens160" }, + { } +}; +MODULE_DEVICE_TABLE(of, ens160_of_i2c_match); + +static struct i2c_driver ens160_i2c_driver = { + .driver = { + .name = "ens160_i2c", + .of_match_table = ens160_of_i2c_match, + }, + .probe = ens160_i2c_probe, + .remove = ens160_i2c_remove, + .id_table = ens160_i2c_id, +}; +module_i2c_driver(ens160_i2c_driver); + +MODULE_AUTHOR("Gustavo Silva <gustavograzs@xxxxxxxxx>"); +MODULE_DESCRIPTION("ScioSense ENS160 I2C driver"); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(IIO_ENS160); diff --git a/drivers/iio/chemical/ens160_spi.c b/drivers/iio/chemical/ens160_spi.c new file mode 100644 index 000000000..effc4acee --- /dev/null +++ b/drivers/iio/chemical/ens160_spi.c @@ -0,0 +1,69 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ScioSense ENS160 multi-gas sensor SPI driver + * + * Copyright (c) 2024 Gustavo Silva <gustavograzs@xxxxxxxxx> + */ + +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/spi/spi.h> + +#include "ens160.h" + +#define ENS160_SPI_READ BIT(0) + +static const struct regmap_config ens160_regmap_spi_conf = { + .reg_bits = 8, + .val_bits = 8, + .reg_shift = -1, + .read_flag_mask = ENS160_SPI_READ, +}; + +static int ens160_spi_probe(struct spi_device *spi) +{ + struct regmap *regmap; + const struct spi_device_id *id = spi_get_device_id(spi); + + regmap = devm_regmap_init_spi(spi, &ens160_regmap_spi_conf); + if (IS_ERR(regmap)) { + dev_err(&spi->dev, "Failed to register spi regmap: %pe\n", + regmap); + return PTR_ERR(regmap); + } + + return ens160_core_probe(&spi->dev, regmap, id->name); +} + +static void ens160_spi_remove(struct spi_device *spi) +{ + ens160_core_remove(&spi->dev); +} + +static const struct of_device_id ens160_spi_of_match[] = { + { .compatible = "sciosense,ens160" }, + { } +}; +MODULE_DEVICE_TABLE(of, ens160_spi_of_match); + +static const struct spi_device_id ens160_spi_id[] = { + { "ens160", 0 }, + { } +}; +MODULE_DEVICE_TABLE(spi, ens160_spi_id); + +static struct spi_driver ens160_spi_driver = { + .driver = { + .name = "ens160_spi", + .of_match_table = ens160_spi_of_match, + }, + .probe = ens160_spi_probe, + .remove = ens160_spi_remove, + .id_table = ens160_spi_id, +}; +module_spi_driver(ens160_spi_driver); + +MODULE_AUTHOR("Gustavo Silva <gustavograzs@xxxxxxxxx>"); +MODULE_DESCRIPTION("ScioSense ENS160 SPI driver"); +MODULE_LICENSE("GPL v2"); +MODULE_IMPORT_NS(IIO_ENS160); -- 2.45.0
