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-rw-r--r--drivers/iio/chemical/Kconfig155
-rw-r--r--drivers/iio/chemical/Makefile20
-rw-r--r--drivers/iio/chemical/ams-iaq-core.c190
-rw-r--r--drivers/iio/chemical/atlas-ezo-sensor.c246
-rw-r--r--drivers/iio/chemical/atlas-sensor.c787
-rw-r--r--drivers/iio/chemical/bme680.h91
-rw-r--r--drivers/iio/chemical/bme680_core.c964
-rw-r--r--drivers/iio/chemical/bme680_i2c.c71
-rw-r--r--drivers/iio/chemical/bme680_spi.c174
-rw-r--r--drivers/iio/chemical/ccs811.c575
-rw-r--r--drivers/iio/chemical/pms7003.c351
-rw-r--r--drivers/iio/chemical/scd30.h78
-rw-r--r--drivers/iio/chemical/scd30_core.c766
-rw-r--r--drivers/iio/chemical/scd30_i2c.c139
-rw-r--r--drivers/iio/chemical/scd30_serial.c263
-rw-r--r--drivers/iio/chemical/sgp30.c589
-rw-r--r--drivers/iio/chemical/sps30.c550
-rw-r--r--drivers/iio/chemical/vz89x.c412
18 files changed, 6421 insertions, 0 deletions
diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig
new file mode 100644
index 000000000..10bb431bc
--- /dev/null
+++ b/drivers/iio/chemical/Kconfig
@@ -0,0 +1,155 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Chemical sensors
+#
+
+menu "Chemical Sensors"
+
+config ATLAS_PH_SENSOR
+ tristate "Atlas Scientific OEM SM sensors"
+ depends on I2C
+ select REGMAP_I2C
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ select IRQ_WORK
+ help
+ Say Y here to build I2C interface support for the following
+ Atlas Scientific OEM SM sensors:
+ * pH SM sensor
+ * EC SM sensor
+ * ORP SM sensor
+
+ To compile this driver as module, choose M here: the
+ module will be called atlas-ph-sensor.
+
+config ATLAS_EZO_SENSOR
+ tristate "Atlas Scientific EZO sensors"
+ depends on I2C
+ help
+ Say Y here to build I2C interface support for the following
+ Atlas Scientific EZO sensors
+ * CO2 EZO Sensor
+
+ To compile this driver as module, choose M here: the
+ module will be called atlas-ezo-sensor.
+
+config BME680
+ tristate "Bosch Sensortec BME680 sensor driver"
+ depends on (I2C || SPI)
+ select REGMAP
+ select BME680_I2C if I2C
+ select BME680_SPI if SPI
+ help
+ Say yes here to build support for Bosch Sensortec BME680 sensor with
+ temperature, pressure, humidity and gas sensing capability.
+
+ This driver can also be built as a module. If so, the module for I2C
+ would be called bme680_i2c and bme680_spi for SPI support.
+
+config BME680_I2C
+ tristate
+ depends on I2C && BME680
+ select REGMAP_I2C
+
+config BME680_SPI
+ tristate
+ depends on SPI && BME680
+ select REGMAP_SPI
+
+config CCS811
+ tristate "AMS CCS811 VOC sensor"
+ depends on I2C
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Say Y here to build I2C interface support for the AMS
+ CCS811 VOC (Volatile Organic Compounds) sensor
+
+config IAQCORE
+ tristate "AMS iAQ-Core VOC sensors"
+ depends on I2C
+ help
+ Say Y here to build I2C interface support for the AMS
+ iAQ-Core Continuous/Pulsed VOC (Volatile Organic Compounds)
+ sensors
+
+config PMS7003
+ tristate "Plantower PMS7003 particulate matter sensor"
+ depends on SERIAL_DEV_BUS
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Say Y here to build support for the Plantower PMS7003 particulate
+ matter sensor.
+
+ To compile this driver as a module, choose M here: the module will
+ be called pms7003.
+
+config SCD30_CORE
+ tristate "SCD30 carbon dioxide sensor driver"
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Say Y here to build support for the Sensirion SCD30 sensor with carbon
+ dioxide, relative humidity and temperature sensing capabilities.
+
+ To compile this driver as a module, choose M here: the module will
+ be called scd30_core.
+
+config SCD30_I2C
+ tristate "SCD30 carbon dioxide sensor I2C driver"
+ depends on SCD30_CORE && I2C
+ select CRC8
+ help
+ Say Y here to build support for the Sensirion SCD30 I2C interface
+ driver.
+
+ To compile this driver as a module, choose M here: the module will
+ be called scd30_i2c.
+
+config SCD30_SERIAL
+ tristate "SCD30 carbon dioxide sensor serial driver"
+ depends on SCD30_CORE && SERIAL_DEV_BUS
+ select CRC16
+ help
+ Say Y here to build support for the Sensirion SCD30 serial interface
+ driver.
+
+ To compile this driver as a module, choose M here: the module will
+ be called scd30_serial.
+
+config SENSIRION_SGP30
+ tristate "Sensirion SGPxx gas sensors"
+ depends on I2C
+ select CRC8
+ help
+ Say Y here to build I2C interface support for the following
+ Sensirion SGP gas sensors:
+ * SGP30 gas sensor
+ * SGPC3 low power gas sensor
+
+ To compile this driver as module, choose M here: the
+ module will be called sgp30.
+
+config SPS30
+ tristate "SPS30 particulate matter sensor"
+ depends on I2C
+ select CRC8
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ Say Y here to build support for the Sensirion SPS30 particulate
+ matter sensor.
+
+ To compile this driver as a module, choose M here: the module will
+ be called sps30.
+
+config VZ89X
+ tristate "SGX Sensortech MiCS VZ89X VOC sensor"
+ depends on I2C
+ help
+ Say Y here to build I2C interface support for the SGX
+ Sensortech MiCS VZ89X VOC (Volatile Organic Compounds)
+ sensors
+
+endmenu
diff --git a/drivers/iio/chemical/Makefile b/drivers/iio/chemical/Makefile
new file mode 100644
index 000000000..fef63dd5b
--- /dev/null
+++ b/drivers/iio/chemical/Makefile
@@ -0,0 +1,20 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for IIO chemical sensors
+#
+
+# When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_ATLAS_PH_SENSOR) += atlas-sensor.o
+obj-$(CONFIG_ATLAS_EZO_SENSOR) += atlas-ezo-sensor.o
+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-$(CONFIG_IAQCORE) += ams-iaq-core.o
+obj-$(CONFIG_PMS7003) += pms7003.o
+obj-$(CONFIG_SCD30_CORE) += scd30_core.o
+obj-$(CONFIG_SCD30_I2C) += scd30_i2c.o
+obj-$(CONFIG_SCD30_SERIAL) += scd30_serial.o
+obj-$(CONFIG_SENSIRION_SGP30) += sgp30.o
+obj-$(CONFIG_SPS30) += sps30.o
+obj-$(CONFIG_VZ89X) += vz89x.o
diff --git a/drivers/iio/chemical/ams-iaq-core.c b/drivers/iio/chemical/ams-iaq-core.c
new file mode 100644
index 000000000..97be3669c
--- /dev/null
+++ b/drivers/iio/chemical/ams-iaq-core.c
@@ -0,0 +1,190 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * ams-iaq-core.c - Support for AMS iAQ-Core VOC sensors
+ *
+ * Copyright (C) 2015, 2018
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ */
+
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+
+#define AMS_IAQCORE_DATA_SIZE 9
+
+#define AMS_IAQCORE_VOC_CO2_IDX 0
+#define AMS_IAQCORE_VOC_RESISTANCE_IDX 1
+#define AMS_IAQCORE_VOC_TVOC_IDX 2
+
+struct ams_iaqcore_reading {
+ __be16 co2_ppm;
+ u8 status;
+ __be32 resistance;
+ __be16 voc_ppb;
+} __attribute__((__packed__));
+
+struct ams_iaqcore_data {
+ struct i2c_client *client;
+ struct mutex lock;
+ unsigned long last_update;
+
+ struct ams_iaqcore_reading buffer;
+};
+
+static const struct iio_chan_spec ams_iaqcore_channels[] = {
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_CO2,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .address = AMS_IAQCORE_VOC_CO2_IDX,
+ },
+ {
+ .type = IIO_RESISTANCE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .address = AMS_IAQCORE_VOC_RESISTANCE_IDX,
+ },
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_VOC,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .address = AMS_IAQCORE_VOC_TVOC_IDX,
+ },
+};
+
+static int ams_iaqcore_read_measurement(struct ams_iaqcore_data *data)
+{
+ struct i2c_client *client = data->client;
+ int ret;
+
+ struct i2c_msg msg = {
+ .addr = client->addr,
+ .flags = client->flags | I2C_M_RD,
+ .len = AMS_IAQCORE_DATA_SIZE,
+ .buf = (char *) &data->buffer,
+ };
+
+ ret = i2c_transfer(client->adapter, &msg, 1);
+
+ return (ret == AMS_IAQCORE_DATA_SIZE) ? 0 : ret;
+}
+
+static int ams_iaqcore_get_measurement(struct ams_iaqcore_data *data)
+{
+ int ret;
+
+ /* sensor can only be polled once a second max per datasheet */
+ if (!time_after(jiffies, data->last_update + HZ))
+ return 0;
+
+ ret = ams_iaqcore_read_measurement(data);
+ if (ret < 0)
+ return ret;
+
+ data->last_update = jiffies;
+
+ return 0;
+}
+
+static int ams_iaqcore_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct ams_iaqcore_data *data = iio_priv(indio_dev);
+ int ret;
+
+ if (mask != IIO_CHAN_INFO_PROCESSED)
+ return -EINVAL;
+
+ mutex_lock(&data->lock);
+ ret = ams_iaqcore_get_measurement(data);
+
+ if (ret)
+ goto err_out;
+
+ switch (chan->address) {
+ case AMS_IAQCORE_VOC_CO2_IDX:
+ *val = 0;
+ *val2 = be16_to_cpu(data->buffer.co2_ppm);
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ case AMS_IAQCORE_VOC_RESISTANCE_IDX:
+ *val = be32_to_cpu(data->buffer.resistance);
+ ret = IIO_VAL_INT;
+ break;
+ case AMS_IAQCORE_VOC_TVOC_IDX:
+ *val = 0;
+ *val2 = be16_to_cpu(data->buffer.voc_ppb);
+ ret = IIO_VAL_INT_PLUS_NANO;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+err_out:
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static const struct iio_info ams_iaqcore_info = {
+ .read_raw = ams_iaqcore_read_raw,
+};
+
+static int ams_iaqcore_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct iio_dev *indio_dev;
+ struct ams_iaqcore_data *data;
+
+ 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;
+
+ /* so initial reading will complete */
+ data->last_update = jiffies - HZ;
+ mutex_init(&data->lock);
+
+ indio_dev->info = &ams_iaqcore_info;
+ indio_dev->name = dev_name(&client->dev);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ indio_dev->channels = ams_iaqcore_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ams_iaqcore_channels);
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id ams_iaqcore_id[] = {
+ { "ams-iaq-core", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ams_iaqcore_id);
+
+static const struct of_device_id ams_iaqcore_dt_ids[] = {
+ { .compatible = "ams,iaq-core" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ams_iaqcore_dt_ids);
+
+static struct i2c_driver ams_iaqcore_driver = {
+ .driver = {
+ .name = "ams-iaq-core",
+ .of_match_table = ams_iaqcore_dt_ids,
+ },
+ .probe = ams_iaqcore_probe,
+ .id_table = ams_iaqcore_id,
+};
+module_i2c_driver(ams_iaqcore_driver);
+
+MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
+MODULE_DESCRIPTION("AMS iAQ-Core VOC sensors");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/atlas-ezo-sensor.c b/drivers/iio/chemical/atlas-ezo-sensor.c
new file mode 100644
index 000000000..b1bacfe3c
--- /dev/null
+++ b/drivers/iio/chemical/atlas-ezo-sensor.c
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * atlas-ezo-sensor.c - Support for Atlas Scientific EZO sensors
+ *
+ * Copyright (C) 2020 Konsulko Group
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/of_device.h>
+#include <linux/iio/iio.h>
+
+#define ATLAS_EZO_DRV_NAME "atlas-ezo-sensor"
+#define ATLAS_INT_TIME_IN_MS 950
+#define ATLAS_INT_HUM_TIME_IN_MS 350
+
+enum {
+ ATLAS_CO2_EZO,
+ ATLAS_O2_EZO,
+ ATLAS_HUM_EZO,
+};
+
+struct atlas_ezo_device {
+ const struct iio_chan_spec *channels;
+ int num_channels;
+ int delay;
+};
+
+struct atlas_ezo_data {
+ struct i2c_client *client;
+ struct atlas_ezo_device *chip;
+
+ /* lock to avoid multiple concurrent read calls */
+ struct mutex lock;
+
+ u8 buffer[8];
+};
+
+#define ATLAS_CONCENTRATION_CHANNEL(_modifier) \
+ { \
+ .type = IIO_CONCENTRATION, \
+ .modified = 1,\
+ .channel2 = _modifier, \
+ .info_mask_separate = \
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), \
+ .scan_index = 0, \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = 32, \
+ .storagebits = 32, \
+ .endianness = IIO_CPU, \
+ }, \
+ }
+
+static const struct iio_chan_spec atlas_co2_ezo_channels[] = {
+ ATLAS_CONCENTRATION_CHANNEL(IIO_MOD_CO2),
+};
+
+static const struct iio_chan_spec atlas_o2_ezo_channels[] = {
+ ATLAS_CONCENTRATION_CHANNEL(IIO_MOD_O2),
+};
+
+static const struct iio_chan_spec atlas_hum_ezo_channels[] = {
+ {
+ .type = IIO_HUMIDITYRELATIVE,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
+ },
+};
+
+static struct atlas_ezo_device atlas_ezo_devices[] = {
+ [ATLAS_CO2_EZO] = {
+ .channels = atlas_co2_ezo_channels,
+ .num_channels = 1,
+ .delay = ATLAS_INT_TIME_IN_MS,
+ },
+ [ATLAS_O2_EZO] = {
+ .channels = atlas_o2_ezo_channels,
+ .num_channels = 1,
+ .delay = ATLAS_INT_TIME_IN_MS,
+ },
+ [ATLAS_HUM_EZO] = {
+ .channels = atlas_hum_ezo_channels,
+ .num_channels = 1,
+ .delay = ATLAS_INT_HUM_TIME_IN_MS,
+ },
+};
+
+static void atlas_ezo_sanitize(char *buf)
+{
+ char *ptr = strchr(buf, '.');
+
+ if (!ptr)
+ return;
+
+ memmove(ptr, ptr + 1, strlen(ptr));
+}
+
+static int atlas_ezo_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct atlas_ezo_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+
+ if (chan->type != IIO_CONCENTRATION)
+ return -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW: {
+ int ret;
+ long tmp;
+
+ mutex_lock(&data->lock);
+
+ tmp = i2c_smbus_write_byte(client, 'R');
+
+ if (tmp < 0) {
+ mutex_unlock(&data->lock);
+ return tmp;
+ }
+
+ msleep(data->chip->delay);
+
+ tmp = i2c_master_recv(client, data->buffer, sizeof(data->buffer));
+
+ if (tmp < 0 || data->buffer[0] != 1) {
+ mutex_unlock(&data->lock);
+ return -EBUSY;
+ }
+
+ /* removing floating point for fixed number representation */
+ atlas_ezo_sanitize(data->buffer + 2);
+
+ ret = kstrtol(data->buffer + 1, 10, &tmp);
+
+ *val = tmp;
+
+ mutex_unlock(&data->lock);
+
+ return ret ? ret : IIO_VAL_INT;
+ }
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_HUMIDITYRELATIVE:
+ *val = 10;
+ return IIO_VAL_INT;
+ case IIO_CONCENTRATION:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* IIO_CONCENTRATION modifiers */
+ switch (chan->channel2) {
+ case IIO_MOD_CO2:
+ *val = 0;
+ *val2 = 100; /* 0.0001 */
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_MOD_O2:
+ *val = 100;
+ return IIO_VAL_INT;
+ }
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct iio_info atlas_info = {
+ .read_raw = atlas_ezo_read_raw,
+};
+
+static const struct i2c_device_id atlas_ezo_id[] = {
+ { "atlas-co2-ezo", ATLAS_CO2_EZO },
+ { "atlas-o2-ezo", ATLAS_O2_EZO },
+ { "atlas-hum-ezo", ATLAS_HUM_EZO },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, atlas_ezo_id);
+
+static const struct of_device_id atlas_ezo_dt_ids[] = {
+ { .compatible = "atlas,co2-ezo", .data = (void *)ATLAS_CO2_EZO, },
+ { .compatible = "atlas,o2-ezo", .data = (void *)ATLAS_O2_EZO, },
+ { .compatible = "atlas,hum-ezo", .data = (void *)ATLAS_HUM_EZO, },
+ {}
+};
+MODULE_DEVICE_TABLE(of, atlas_ezo_dt_ids);
+
+static int atlas_ezo_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct atlas_ezo_data *data;
+ struct atlas_ezo_device *chip;
+ const struct of_device_id *of_id;
+ struct iio_dev *indio_dev;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ of_id = of_match_device(atlas_ezo_dt_ids, &client->dev);
+ if (!of_id)
+ chip = &atlas_ezo_devices[id->driver_data];
+ else
+ chip = &atlas_ezo_devices[(unsigned long)of_id->data];
+
+ indio_dev->info = &atlas_info;
+ indio_dev->name = ATLAS_EZO_DRV_NAME;
+ indio_dev->channels = chip->channels;
+ indio_dev->num_channels = chip->num_channels;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ data = iio_priv(indio_dev);
+ data->client = client;
+ data->chip = chip;
+ mutex_init(&data->lock);
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+};
+
+static struct i2c_driver atlas_ezo_driver = {
+ .driver = {
+ .name = ATLAS_EZO_DRV_NAME,
+ .of_match_table = atlas_ezo_dt_ids,
+ },
+ .probe = atlas_ezo_probe,
+ .id_table = atlas_ezo_id,
+};
+module_i2c_driver(atlas_ezo_driver);
+
+MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
+MODULE_DESCRIPTION("Atlas Scientific EZO sensors");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/chemical/atlas-sensor.c b/drivers/iio/chemical/atlas-sensor.c
new file mode 100644
index 000000000..0c8a50de8
--- /dev/null
+++ b/drivers/iio/chemical/atlas-sensor.c
@@ -0,0 +1,787 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * atlas-sensor.c - Support for Atlas Scientific OEM SM sensors
+ *
+ * Copyright (C) 2015-2019 Konsulko Group
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/irq_work.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/pm_runtime.h>
+
+#define ATLAS_REGMAP_NAME "atlas_regmap"
+#define ATLAS_DRV_NAME "atlas"
+
+#define ATLAS_REG_DEV_TYPE 0x00
+#define ATLAS_REG_DEV_VERSION 0x01
+
+#define ATLAS_REG_INT_CONTROL 0x04
+#define ATLAS_REG_INT_CONTROL_EN BIT(3)
+
+#define ATLAS_REG_PWR_CONTROL 0x06
+
+#define ATLAS_REG_PH_CALIB_STATUS 0x0d
+#define ATLAS_REG_PH_CALIB_STATUS_MASK 0x07
+#define ATLAS_REG_PH_CALIB_STATUS_LOW BIT(0)
+#define ATLAS_REG_PH_CALIB_STATUS_MID BIT(1)
+#define ATLAS_REG_PH_CALIB_STATUS_HIGH BIT(2)
+
+#define ATLAS_REG_EC_CALIB_STATUS 0x0f
+#define ATLAS_REG_EC_CALIB_STATUS_MASK 0x0f
+#define ATLAS_REG_EC_CALIB_STATUS_DRY BIT(0)
+#define ATLAS_REG_EC_CALIB_STATUS_SINGLE BIT(1)
+#define ATLAS_REG_EC_CALIB_STATUS_LOW BIT(2)
+#define ATLAS_REG_EC_CALIB_STATUS_HIGH BIT(3)
+
+#define ATLAS_REG_DO_CALIB_STATUS 0x09
+#define ATLAS_REG_DO_CALIB_STATUS_MASK 0x03
+#define ATLAS_REG_DO_CALIB_STATUS_PRESSURE BIT(0)
+#define ATLAS_REG_DO_CALIB_STATUS_DO BIT(1)
+
+#define ATLAS_REG_RTD_DATA 0x0e
+
+#define ATLAS_REG_PH_TEMP_DATA 0x0e
+#define ATLAS_REG_PH_DATA 0x16
+
+#define ATLAS_REG_EC_PROBE 0x08
+#define ATLAS_REG_EC_TEMP_DATA 0x10
+#define ATLAS_REG_EC_DATA 0x18
+#define ATLAS_REG_TDS_DATA 0x1c
+#define ATLAS_REG_PSS_DATA 0x20
+
+#define ATLAS_REG_ORP_CALIB_STATUS 0x0d
+#define ATLAS_REG_ORP_DATA 0x0e
+
+#define ATLAS_REG_DO_TEMP_DATA 0x12
+#define ATLAS_REG_DO_DATA 0x22
+
+#define ATLAS_PH_INT_TIME_IN_MS 450
+#define ATLAS_EC_INT_TIME_IN_MS 650
+#define ATLAS_ORP_INT_TIME_IN_MS 450
+#define ATLAS_DO_INT_TIME_IN_MS 450
+#define ATLAS_RTD_INT_TIME_IN_MS 450
+
+enum {
+ ATLAS_PH_SM,
+ ATLAS_EC_SM,
+ ATLAS_ORP_SM,
+ ATLAS_DO_SM,
+ ATLAS_RTD_SM,
+};
+
+struct atlas_data {
+ struct i2c_client *client;
+ struct iio_trigger *trig;
+ struct atlas_device *chip;
+ struct regmap *regmap;
+ struct irq_work work;
+ unsigned int interrupt_enabled;
+ /* 96-bit data + 32-bit pad + 64-bit timestamp */
+ __be32 buffer[6] __aligned(8);
+};
+
+static const struct regmap_config atlas_regmap_config = {
+ .name = ATLAS_REGMAP_NAME,
+ .reg_bits = 8,
+ .val_bits = 8,
+};
+
+static int atlas_buffer_num_channels(const struct iio_chan_spec *spec)
+{
+ int idx = 0;
+
+ for (; spec->type != IIO_TIMESTAMP; spec++)
+ idx++;
+
+ return idx;
+};
+
+static const struct iio_chan_spec atlas_ph_channels[] = {
+ {
+ .type = IIO_PH,
+ .address = ATLAS_REG_PH_DATA,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_BE,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(1),
+ {
+ .type = IIO_TEMP,
+ .address = ATLAS_REG_PH_TEMP_DATA,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .output = 1,
+ .scan_index = -1
+ },
+};
+
+#define ATLAS_CONCENTRATION_CHANNEL(_idx, _addr) \
+ {\
+ .type = IIO_CONCENTRATION, \
+ .indexed = 1, \
+ .channel = _idx, \
+ .address = _addr, \
+ .info_mask_separate = \
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), \
+ .scan_index = _idx + 1, \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = 32, \
+ .storagebits = 32, \
+ .endianness = IIO_BE, \
+ }, \
+ }
+
+static const struct iio_chan_spec atlas_ec_channels[] = {
+ {
+ .type = IIO_ELECTRICALCONDUCTIVITY,
+ .address = ATLAS_REG_EC_DATA,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_BE,
+ },
+ },
+ ATLAS_CONCENTRATION_CHANNEL(0, ATLAS_REG_TDS_DATA),
+ ATLAS_CONCENTRATION_CHANNEL(1, ATLAS_REG_PSS_DATA),
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+ {
+ .type = IIO_TEMP,
+ .address = ATLAS_REG_EC_TEMP_DATA,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .output = 1,
+ .scan_index = -1
+ },
+};
+
+static const struct iio_chan_spec atlas_orp_channels[] = {
+ {
+ .type = IIO_VOLTAGE,
+ .address = ATLAS_REG_ORP_DATA,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_BE,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
+static const struct iio_chan_spec atlas_do_channels[] = {
+ {
+ .type = IIO_CONCENTRATION,
+ .address = ATLAS_REG_DO_DATA,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_BE,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(1),
+ {
+ .type = IIO_TEMP,
+ .address = ATLAS_REG_DO_TEMP_DATA,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .output = 1,
+ .scan_index = -1
+ },
+};
+
+static const struct iio_chan_spec atlas_rtd_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .address = ATLAS_REG_RTD_DATA,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_BE,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
+static int atlas_check_ph_calibration(struct atlas_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(data->regmap, ATLAS_REG_PH_CALIB_STATUS, &val);
+ if (ret)
+ return ret;
+
+ if (!(val & ATLAS_REG_PH_CALIB_STATUS_MASK)) {
+ dev_warn(dev, "device has not been calibrated\n");
+ return 0;
+ }
+
+ if (!(val & ATLAS_REG_PH_CALIB_STATUS_LOW))
+ dev_warn(dev, "device missing low point calibration\n");
+
+ if (!(val & ATLAS_REG_PH_CALIB_STATUS_MID))
+ dev_warn(dev, "device missing mid point calibration\n");
+
+ if (!(val & ATLAS_REG_PH_CALIB_STATUS_HIGH))
+ dev_warn(dev, "device missing high point calibration\n");
+
+ return 0;
+}
+
+static int atlas_check_ec_calibration(struct atlas_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+ unsigned int val;
+ __be16 rval;
+
+ ret = regmap_bulk_read(data->regmap, ATLAS_REG_EC_PROBE, &rval, 2);
+ if (ret)
+ return ret;
+
+ val = be16_to_cpu(rval);
+ dev_info(dev, "probe set to K = %d.%.2d", val / 100, val % 100);
+
+ ret = regmap_read(data->regmap, ATLAS_REG_EC_CALIB_STATUS, &val);
+ if (ret)
+ return ret;
+
+ if (!(val & ATLAS_REG_EC_CALIB_STATUS_MASK)) {
+ dev_warn(dev, "device has not been calibrated\n");
+ return 0;
+ }
+
+ if (!(val & ATLAS_REG_EC_CALIB_STATUS_DRY))
+ dev_warn(dev, "device missing dry point calibration\n");
+
+ if (val & ATLAS_REG_EC_CALIB_STATUS_SINGLE) {
+ dev_warn(dev, "device using single point calibration\n");
+ } else {
+ if (!(val & ATLAS_REG_EC_CALIB_STATUS_LOW))
+ dev_warn(dev, "device missing low point calibration\n");
+
+ if (!(val & ATLAS_REG_EC_CALIB_STATUS_HIGH))
+ dev_warn(dev, "device missing high point calibration\n");
+ }
+
+ return 0;
+}
+
+static int atlas_check_orp_calibration(struct atlas_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(data->regmap, ATLAS_REG_ORP_CALIB_STATUS, &val);
+ if (ret)
+ return ret;
+
+ if (!val)
+ dev_warn(dev, "device has not been calibrated\n");
+
+ return 0;
+}
+
+static int atlas_check_do_calibration(struct atlas_data *data)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(data->regmap, ATLAS_REG_DO_CALIB_STATUS, &val);
+ if (ret)
+ return ret;
+
+ if (!(val & ATLAS_REG_DO_CALIB_STATUS_MASK)) {
+ dev_warn(dev, "device has not been calibrated\n");
+ return 0;
+ }
+
+ if (!(val & ATLAS_REG_DO_CALIB_STATUS_PRESSURE))
+ dev_warn(dev, "device missing atmospheric pressure calibration\n");
+
+ if (!(val & ATLAS_REG_DO_CALIB_STATUS_DO))
+ dev_warn(dev, "device missing dissolved oxygen calibration\n");
+
+ return 0;
+}
+
+struct atlas_device {
+ const struct iio_chan_spec *channels;
+ int num_channels;
+ int data_reg;
+
+ int (*calibration)(struct atlas_data *data);
+ int delay;
+};
+
+static struct atlas_device atlas_devices[] = {
+ [ATLAS_PH_SM] = {
+ .channels = atlas_ph_channels,
+ .num_channels = 3,
+ .data_reg = ATLAS_REG_PH_DATA,
+ .calibration = &atlas_check_ph_calibration,
+ .delay = ATLAS_PH_INT_TIME_IN_MS,
+ },
+ [ATLAS_EC_SM] = {
+ .channels = atlas_ec_channels,
+ .num_channels = 5,
+ .data_reg = ATLAS_REG_EC_DATA,
+ .calibration = &atlas_check_ec_calibration,
+ .delay = ATLAS_EC_INT_TIME_IN_MS,
+ },
+ [ATLAS_ORP_SM] = {
+ .channels = atlas_orp_channels,
+ .num_channels = 2,
+ .data_reg = ATLAS_REG_ORP_DATA,
+ .calibration = &atlas_check_orp_calibration,
+ .delay = ATLAS_ORP_INT_TIME_IN_MS,
+ },
+ [ATLAS_DO_SM] = {
+ .channels = atlas_do_channels,
+ .num_channels = 3,
+ .data_reg = ATLAS_REG_DO_DATA,
+ .calibration = &atlas_check_do_calibration,
+ .delay = ATLAS_DO_INT_TIME_IN_MS,
+ },
+ [ATLAS_RTD_SM] = {
+ .channels = atlas_rtd_channels,
+ .num_channels = 2,
+ .data_reg = ATLAS_REG_RTD_DATA,
+ .delay = ATLAS_RTD_INT_TIME_IN_MS,
+ },
+};
+
+static int atlas_set_powermode(struct atlas_data *data, int on)
+{
+ return regmap_write(data->regmap, ATLAS_REG_PWR_CONTROL, on);
+}
+
+static int atlas_set_interrupt(struct atlas_data *data, bool state)
+{
+ if (!data->interrupt_enabled)
+ return 0;
+
+ return regmap_update_bits(data->regmap, ATLAS_REG_INT_CONTROL,
+ ATLAS_REG_INT_CONTROL_EN,
+ state ? ATLAS_REG_INT_CONTROL_EN : 0);
+}
+
+static int atlas_buffer_postenable(struct iio_dev *indio_dev)
+{
+ struct atlas_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = pm_runtime_get_sync(&data->client->dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(&data->client->dev);
+ return ret;
+ }
+
+ return atlas_set_interrupt(data, true);
+}
+
+static int atlas_buffer_predisable(struct iio_dev *indio_dev)
+{
+ struct atlas_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = atlas_set_interrupt(data, false);
+ if (ret)
+ return ret;
+
+ pm_runtime_mark_last_busy(&data->client->dev);
+ ret = pm_runtime_put_autosuspend(&data->client->dev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static const struct iio_trigger_ops atlas_interrupt_trigger_ops = {
+};
+
+static const struct iio_buffer_setup_ops atlas_buffer_setup_ops = {
+ .postenable = atlas_buffer_postenable,
+ .predisable = atlas_buffer_predisable,
+};
+
+static void atlas_work_handler(struct irq_work *work)
+{
+ struct atlas_data *data = container_of(work, struct atlas_data, work);
+
+ iio_trigger_poll(data->trig);
+}
+
+static irqreturn_t atlas_trigger_handler(int irq, void *private)
+{
+ struct iio_poll_func *pf = private;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct atlas_data *data = iio_priv(indio_dev);
+ int channels = atlas_buffer_num_channels(data->chip->channels);
+ int ret;
+
+ ret = regmap_bulk_read(data->regmap, data->chip->data_reg,
+ &data->buffer, sizeof(__be32) * channels);
+
+ if (!ret)
+ iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
+ iio_get_time_ns(indio_dev));
+
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t atlas_interrupt_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct atlas_data *data = iio_priv(indio_dev);
+
+ irq_work_queue(&data->work);
+
+ return IRQ_HANDLED;
+}
+
+static int atlas_read_measurement(struct atlas_data *data, int reg, __be32 *val)
+{
+ struct device *dev = &data->client->dev;
+ int suspended = pm_runtime_suspended(dev);
+ int ret;
+
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ pm_runtime_put_noidle(dev);
+ return ret;
+ }
+
+ if (suspended)
+ msleep(data->chip->delay);
+
+ ret = regmap_bulk_read(data->regmap, reg, val, sizeof(*val));
+
+ pm_runtime_mark_last_busy(dev);
+ pm_runtime_put_autosuspend(dev);
+
+ return ret;
+}
+
+static int atlas_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct atlas_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ case IIO_CHAN_INFO_RAW: {
+ int ret;
+ __be32 reg;
+
+ switch (chan->type) {
+ case IIO_TEMP:
+ ret = regmap_bulk_read(data->regmap, chan->address,
+ &reg, sizeof(reg));
+ break;
+ case IIO_PH:
+ case IIO_CONCENTRATION:
+ case IIO_ELECTRICALCONDUCTIVITY:
+ case IIO_VOLTAGE:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+
+ ret = atlas_read_measurement(data, chan->address, &reg);
+
+ iio_device_release_direct_mode(indio_dev);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ if (!ret) {
+ *val = be32_to_cpu(reg);
+ ret = IIO_VAL_INT;
+ }
+ return ret;
+ }
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_TEMP:
+ *val = 10;
+ return IIO_VAL_INT;
+ case IIO_PH:
+ *val = 1; /* 0.001 */
+ *val2 = 1000;
+ break;
+ case IIO_ELECTRICALCONDUCTIVITY:
+ *val = 1; /* 0.00001 */
+ *val2 = 100000;
+ break;
+ case IIO_CONCENTRATION:
+ *val = 0; /* 0.000000001 */
+ *val2 = 1000;
+ return IIO_VAL_INT_PLUS_NANO;
+ case IIO_VOLTAGE:
+ *val = 1; /* 0.1 */
+ *val2 = 10;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return IIO_VAL_FRACTIONAL;
+ }
+
+ return -EINVAL;
+}
+
+static int atlas_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct atlas_data *data = iio_priv(indio_dev);
+ __be32 reg = cpu_to_be32(val / 10);
+
+ if (val2 != 0 || val < 0 || val > 20000)
+ return -EINVAL;
+
+ if (mask != IIO_CHAN_INFO_RAW || chan->type != IIO_TEMP)
+ return -EINVAL;
+
+ return regmap_bulk_write(data->regmap, chan->address,
+ &reg, sizeof(reg));
+}
+
+static const struct iio_info atlas_info = {
+ .read_raw = atlas_read_raw,
+ .write_raw = atlas_write_raw,
+};
+
+static const struct i2c_device_id atlas_id[] = {
+ { "atlas-ph-sm", ATLAS_PH_SM},
+ { "atlas-ec-sm", ATLAS_EC_SM},
+ { "atlas-orp-sm", ATLAS_ORP_SM},
+ { "atlas-do-sm", ATLAS_DO_SM},
+ { "atlas-rtd-sm", ATLAS_RTD_SM},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, atlas_id);
+
+static const struct of_device_id atlas_dt_ids[] = {
+ { .compatible = "atlas,ph-sm", .data = (void *)ATLAS_PH_SM, },
+ { .compatible = "atlas,ec-sm", .data = (void *)ATLAS_EC_SM, },
+ { .compatible = "atlas,orp-sm", .data = (void *)ATLAS_ORP_SM, },
+ { .compatible = "atlas,do-sm", .data = (void *)ATLAS_DO_SM, },
+ { .compatible = "atlas,rtd-sm", .data = (void *)ATLAS_RTD_SM, },
+ { }
+};
+MODULE_DEVICE_TABLE(of, atlas_dt_ids);
+
+static int atlas_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct atlas_data *data;
+ struct atlas_device *chip;
+ struct iio_trigger *trig;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ if (!dev_fwnode(&client->dev))
+ chip = &atlas_devices[id->driver_data];
+ else
+ chip = &atlas_devices[(unsigned long)device_get_match_data(&client->dev)];
+
+ indio_dev->info = &atlas_info;
+ indio_dev->name = ATLAS_DRV_NAME;
+ indio_dev->channels = chip->channels;
+ indio_dev->num_channels = chip->num_channels;
+ indio_dev->modes = INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE;
+
+ trig = devm_iio_trigger_alloc(&client->dev, "%s-dev%d",
+ indio_dev->name, indio_dev->id);
+
+ if (!trig)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ data->client = client;
+ data->trig = trig;
+ data->chip = chip;
+ trig->dev.parent = indio_dev->dev.parent;
+ trig->ops = &atlas_interrupt_trigger_ops;
+ iio_trigger_set_drvdata(trig, indio_dev);
+
+ i2c_set_clientdata(client, indio_dev);
+
+ data->regmap = devm_regmap_init_i2c(client, &atlas_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ dev_err(&client->dev, "regmap initialization failed\n");
+ return PTR_ERR(data->regmap);
+ }
+
+ ret = pm_runtime_set_active(&client->dev);
+ if (ret)
+ return ret;
+
+ ret = chip->calibration(data);
+ if (ret)
+ return ret;
+
+ ret = iio_trigger_register(trig);
+ if (ret) {
+ dev_err(&client->dev, "failed to register trigger\n");
+ return ret;
+ }
+
+ ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+ &atlas_trigger_handler, &atlas_buffer_setup_ops);
+ if (ret) {
+ dev_err(&client->dev, "cannot setup iio trigger\n");
+ goto unregister_trigger;
+ }
+
+ init_irq_work(&data->work, atlas_work_handler);
+
+ if (client->irq > 0) {
+ /* interrupt pin toggles on new conversion */
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, atlas_interrupt_handler,
+ IRQF_TRIGGER_RISING |
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "atlas_irq",
+ indio_dev);
+
+ if (ret)
+ dev_warn(&client->dev,
+ "request irq (%d) failed\n", client->irq);
+ else
+ data->interrupt_enabled = 1;
+ }
+
+ ret = atlas_set_powermode(data, 1);
+ if (ret) {
+ dev_err(&client->dev, "cannot power device on");
+ goto unregister_buffer;
+ }
+
+ pm_runtime_enable(&client->dev);
+ pm_runtime_set_autosuspend_delay(&client->dev, 2500);
+ pm_runtime_use_autosuspend(&client->dev);
+
+ ret = iio_device_register(indio_dev);
+ if (ret) {
+ dev_err(&client->dev, "unable to register device\n");
+ goto unregister_pm;
+ }
+
+ return 0;
+
+unregister_pm:
+ pm_runtime_disable(&client->dev);
+ atlas_set_powermode(data, 0);
+
+unregister_buffer:
+ iio_triggered_buffer_cleanup(indio_dev);
+
+unregister_trigger:
+ iio_trigger_unregister(data->trig);
+
+ return ret;
+}
+
+static int atlas_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct atlas_data *data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ iio_triggered_buffer_cleanup(indio_dev);
+ iio_trigger_unregister(data->trig);
+
+ pm_runtime_disable(&client->dev);
+ pm_runtime_set_suspended(&client->dev);
+ pm_runtime_put_noidle(&client->dev);
+
+ return atlas_set_powermode(data, 0);
+}
+
+#ifdef CONFIG_PM
+static int atlas_runtime_suspend(struct device *dev)
+{
+ struct atlas_data *data =
+ iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
+
+ return atlas_set_powermode(data, 0);
+}
+
+static int atlas_runtime_resume(struct device *dev)
+{
+ struct atlas_data *data =
+ iio_priv(i2c_get_clientdata(to_i2c_client(dev)));
+
+ return atlas_set_powermode(data, 1);
+}
+#endif
+
+static const struct dev_pm_ops atlas_pm_ops = {
+ SET_RUNTIME_PM_OPS(atlas_runtime_suspend,
+ atlas_runtime_resume, NULL)
+};
+
+static struct i2c_driver atlas_driver = {
+ .driver = {
+ .name = ATLAS_DRV_NAME,
+ .of_match_table = atlas_dt_ids,
+ .pm = &atlas_pm_ops,
+ },
+ .probe = atlas_probe,
+ .remove = atlas_remove,
+ .id_table = atlas_id,
+};
+module_i2c_driver(atlas_driver);
+
+MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
+MODULE_DESCRIPTION("Atlas Scientific SM sensors");
+MODULE_LICENSE("GPL");
diff --git a/drivers/iio/chemical/bme680.h b/drivers/iio/chemical/bme680.h
new file mode 100644
index 000000000..4edc5d21c
--- /dev/null
+++ b/drivers/iio/chemical/bme680.h
@@ -0,0 +1,91 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef BME680_H_
+#define BME680_H_
+
+#define BME680_REG_CHIP_ID 0xD0
+#define BME680_CHIP_ID_VAL 0x61
+#define BME680_REG_SOFT_RESET 0xE0
+#define BME680_CMD_SOFTRESET 0xB6
+#define BME680_REG_STATUS 0x73
+#define BME680_SPI_MEM_PAGE_BIT BIT(4)
+#define BME680_SPI_MEM_PAGE_1_VAL 1
+
+#define BME680_REG_TEMP_MSB 0x22
+#define BME680_REG_PRESS_MSB 0x1F
+#define BM6880_REG_HUMIDITY_MSB 0x25
+#define BME680_REG_GAS_MSB 0x2A
+#define BME680_REG_GAS_R_LSB 0x2B
+#define BME680_GAS_STAB_BIT BIT(4)
+#define BME680_GAS_RANGE_MASK GENMASK(3, 0)
+
+#define BME680_REG_CTRL_HUMIDITY 0x72
+#define BME680_OSRS_HUMIDITY_MASK GENMASK(2, 0)
+
+#define BME680_REG_CTRL_MEAS 0x74
+#define BME680_OSRS_TEMP_MASK GENMASK(7, 5)
+#define BME680_OSRS_PRESS_MASK GENMASK(4, 2)
+#define BME680_MODE_MASK GENMASK(1, 0)
+#define BME680_MODE_FORCED 1
+#define BME680_MODE_SLEEP 0
+
+#define BME680_REG_CONFIG 0x75
+#define BME680_FILTER_MASK GENMASK(4, 2)
+#define BME680_FILTER_COEFF_VAL BIT(1)
+
+/* TEMP/PRESS/HUMID reading skipped */
+#define BME680_MEAS_SKIPPED 0x8000
+
+#define BME680_MAX_OVERFLOW_VAL 0x40000000
+#define BME680_HUM_REG_SHIFT_VAL 4
+#define BME680_BIT_H1_DATA_MASK GENMASK(3, 0)
+
+#define BME680_REG_RES_HEAT_RANGE 0x02
+#define BME680_RHRANGE_MASK GENMASK(5, 4)
+#define BME680_REG_RES_HEAT_VAL 0x00
+#define BME680_REG_RANGE_SW_ERR 0x04
+#define BME680_RSERROR_MASK GENMASK(7, 4)
+#define BME680_REG_RES_HEAT_0 0x5A
+#define BME680_REG_GAS_WAIT_0 0x64
+#define BME680_ADC_GAS_RES_SHIFT 6
+#define BME680_AMB_TEMP 25
+
+#define BME680_REG_CTRL_GAS_1 0x71
+#define BME680_RUN_GAS_MASK BIT(4)
+#define BME680_NB_CONV_MASK GENMASK(3, 0)
+
+#define BME680_REG_MEAS_STAT_0 0x1D
+#define BME680_GAS_MEAS_BIT BIT(6)
+
+/* Calibration Parameters */
+#define BME680_T2_LSB_REG 0x8A
+#define BME680_T3_REG 0x8C
+#define BME680_P1_LSB_REG 0x8E
+#define BME680_P2_LSB_REG 0x90
+#define BME680_P3_REG 0x92
+#define BME680_P4_LSB_REG 0x94
+#define BME680_P5_LSB_REG 0x96
+#define BME680_P7_REG 0x98
+#define BME680_P6_REG 0x99
+#define BME680_P8_LSB_REG 0x9C
+#define BME680_P9_LSB_REG 0x9E
+#define BME680_P10_REG 0xA0
+#define BME680_H2_LSB_REG 0xE2
+#define BME680_H2_MSB_REG 0xE1
+#define BME680_H1_MSB_REG 0xE3
+#define BME680_H1_LSB_REG 0xE2
+#define BME680_H3_REG 0xE4
+#define BME680_H4_REG 0xE5
+#define BME680_H5_REG 0xE6
+#define BME680_H6_REG 0xE7
+#define BME680_H7_REG 0xE8
+#define BME680_T1_LSB_REG 0xE9
+#define BME680_GH2_LSB_REG 0xEB
+#define BME680_GH1_REG 0xED
+#define BME680_GH3_REG 0xEE
+
+extern const struct regmap_config bme680_regmap_config;
+
+int bme680_core_probe(struct device *dev, struct regmap *regmap,
+ const char *name);
+
+#endif /* BME680_H_ */
diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
new file mode 100644
index 000000000..6ea99e4cb
--- /dev/null
+++ b/drivers/iio/chemical/bme680_core.c
@@ -0,0 +1,964 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Bosch BME680 - Temperature, Pressure, Humidity & Gas Sensor
+ *
+ * Copyright (C) 2017 - 2018 Bosch Sensortec GmbH
+ * Copyright (C) 2018 Himanshu Jha <himanshujha199640@gmail.com>
+ *
+ * Datasheet:
+ * https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME680-DS001-00.pdf
+ */
+#include <linux/acpi.h>
+#include <linux/bitfield.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/log2.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#include "bme680.h"
+
+struct bme680_calib {
+ u16 par_t1;
+ s16 par_t2;
+ s8 par_t3;
+ u16 par_p1;
+ s16 par_p2;
+ s8 par_p3;
+ s16 par_p4;
+ s16 par_p5;
+ s8 par_p6;
+ s8 par_p7;
+ s16 par_p8;
+ s16 par_p9;
+ u8 par_p10;
+ u16 par_h1;
+ u16 par_h2;
+ s8 par_h3;
+ s8 par_h4;
+ s8 par_h5;
+ s8 par_h6;
+ s8 par_h7;
+ s8 par_gh1;
+ s16 par_gh2;
+ s8 par_gh3;
+ u8 res_heat_range;
+ s8 res_heat_val;
+ s8 range_sw_err;
+};
+
+struct bme680_data {
+ struct regmap *regmap;
+ struct bme680_calib bme680;
+ u8 oversampling_temp;
+ u8 oversampling_press;
+ u8 oversampling_humid;
+ u16 heater_dur;
+ u16 heater_temp;
+ /*
+ * Carryover value from temperature conversion, used in pressure
+ * and humidity compensation calculations.
+ */
+ s32 t_fine;
+};
+
+static const struct regmap_range bme680_volatile_ranges[] = {
+ regmap_reg_range(BME680_REG_MEAS_STAT_0, BME680_REG_GAS_R_LSB),
+ regmap_reg_range(BME680_REG_STATUS, BME680_REG_STATUS),
+ regmap_reg_range(BME680_T2_LSB_REG, BME680_GH3_REG),
+};
+
+static const struct regmap_access_table bme680_volatile_table = {
+ .yes_ranges = bme680_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(bme680_volatile_ranges),
+};
+
+const struct regmap_config bme680_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0xef,
+ .volatile_table = &bme680_volatile_table,
+ .cache_type = REGCACHE_RBTREE,
+};
+EXPORT_SYMBOL(bme680_regmap_config);
+
+static const struct iio_chan_spec bme680_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ },
+ {
+ .type = IIO_PRESSURE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ },
+ {
+ .type = IIO_HUMIDITYRELATIVE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+ BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ },
+ {
+ .type = IIO_RESISTANCE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ },
+};
+
+static int bme680_read_calib(struct bme680_data *data,
+ struct bme680_calib *calib)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ unsigned int tmp, tmp_msb, tmp_lsb;
+ int ret;
+ __le16 buf;
+
+ /* Temperature related coefficients */
+ ret = regmap_bulk_read(data->regmap, BME680_T1_LSB_REG,
+ &buf, sizeof(buf));
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_T1_LSB_REG\n");
+ return ret;
+ }
+ calib->par_t1 = le16_to_cpu(buf);
+
+ ret = regmap_bulk_read(data->regmap, BME680_T2_LSB_REG,
+ &buf, sizeof(buf));
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_T2_LSB_REG\n");
+ return ret;
+ }
+ calib->par_t2 = le16_to_cpu(buf);
+
+ ret = regmap_read(data->regmap, BME680_T3_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_T3_REG\n");
+ return ret;
+ }
+ calib->par_t3 = tmp;
+
+ /* Pressure related coefficients */
+ ret = regmap_bulk_read(data->regmap, BME680_P1_LSB_REG,
+ &buf, sizeof(buf));
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P1_LSB_REG\n");
+ return ret;
+ }
+ calib->par_p1 = le16_to_cpu(buf);
+
+ ret = regmap_bulk_read(data->regmap, BME680_P2_LSB_REG,
+ &buf, sizeof(buf));
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P2_LSB_REG\n");
+ return ret;
+ }
+ calib->par_p2 = le16_to_cpu(buf);
+
+ ret = regmap_read(data->regmap, BME680_P3_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P3_REG\n");
+ return ret;
+ }
+ calib->par_p3 = tmp;
+
+ ret = regmap_bulk_read(data->regmap, BME680_P4_LSB_REG,
+ &buf, sizeof(buf));
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P4_LSB_REG\n");
+ return ret;
+ }
+ calib->par_p4 = le16_to_cpu(buf);
+
+ ret = regmap_bulk_read(data->regmap, BME680_P5_LSB_REG,
+ &buf, sizeof(buf));
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P5_LSB_REG\n");
+ return ret;
+ }
+ calib->par_p5 = le16_to_cpu(buf);
+
+ ret = regmap_read(data->regmap, BME680_P6_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P6_REG\n");
+ return ret;
+ }
+ calib->par_p6 = tmp;
+
+ ret = regmap_read(data->regmap, BME680_P7_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P7_REG\n");
+ return ret;
+ }
+ calib->par_p7 = tmp;
+
+ ret = regmap_bulk_read(data->regmap, BME680_P8_LSB_REG,
+ &buf, sizeof(buf));
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P8_LSB_REG\n");
+ return ret;
+ }
+ calib->par_p8 = le16_to_cpu(buf);
+
+ ret = regmap_bulk_read(data->regmap, BME680_P9_LSB_REG,
+ &buf, sizeof(buf));
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P9_LSB_REG\n");
+ return ret;
+ }
+ calib->par_p9 = le16_to_cpu(buf);
+
+ ret = regmap_read(data->regmap, BME680_P10_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_P10_REG\n");
+ return ret;
+ }
+ calib->par_p10 = tmp;
+
+ /* Humidity related coefficients */
+ ret = regmap_read(data->regmap, BME680_H1_MSB_REG, &tmp_msb);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_H1_MSB_REG\n");
+ return ret;
+ }
+ ret = regmap_read(data->regmap, BME680_H1_LSB_REG, &tmp_lsb);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_H1_LSB_REG\n");
+ return ret;
+ }
+ calib->par_h1 = (tmp_msb << BME680_HUM_REG_SHIFT_VAL) |
+ (tmp_lsb & BME680_BIT_H1_DATA_MASK);
+
+ ret = regmap_read(data->regmap, BME680_H2_MSB_REG, &tmp_msb);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_H2_MSB_REG\n");
+ return ret;
+ }
+ ret = regmap_read(data->regmap, BME680_H2_LSB_REG, &tmp_lsb);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_H2_LSB_REG\n");
+ return ret;
+ }
+ calib->par_h2 = (tmp_msb << BME680_HUM_REG_SHIFT_VAL) |
+ (tmp_lsb >> BME680_HUM_REG_SHIFT_VAL);
+
+ ret = regmap_read(data->regmap, BME680_H3_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_H3_REG\n");
+ return ret;
+ }
+ calib->par_h3 = tmp;
+
+ ret = regmap_read(data->regmap, BME680_H4_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_H4_REG\n");
+ return ret;
+ }
+ calib->par_h4 = tmp;
+
+ ret = regmap_read(data->regmap, BME680_H5_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_H5_REG\n");
+ return ret;
+ }
+ calib->par_h5 = tmp;
+
+ ret = regmap_read(data->regmap, BME680_H6_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_H6_REG\n");
+ return ret;
+ }
+ calib->par_h6 = tmp;
+
+ ret = regmap_read(data->regmap, BME680_H7_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_H7_REG\n");
+ return ret;
+ }
+ calib->par_h7 = tmp;
+
+ /* Gas heater related coefficients */
+ ret = regmap_read(data->regmap, BME680_GH1_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_GH1_REG\n");
+ return ret;
+ }
+ calib->par_gh1 = tmp;
+
+ ret = regmap_bulk_read(data->regmap, BME680_GH2_LSB_REG,
+ &buf, sizeof(buf));
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_GH2_LSB_REG\n");
+ return ret;
+ }
+ calib->par_gh2 = le16_to_cpu(buf);
+
+ ret = regmap_read(data->regmap, BME680_GH3_REG, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read BME680_GH3_REG\n");
+ return ret;
+ }
+ calib->par_gh3 = tmp;
+
+ /* Other coefficients */
+ ret = regmap_read(data->regmap, BME680_REG_RES_HEAT_RANGE, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read resistance heat range\n");
+ return ret;
+ }
+ calib->res_heat_range = FIELD_GET(BME680_RHRANGE_MASK, tmp);
+
+ ret = regmap_read(data->regmap, BME680_REG_RES_HEAT_VAL, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read resistance heat value\n");
+ return ret;
+ }
+ calib->res_heat_val = tmp;
+
+ ret = regmap_read(data->regmap, BME680_REG_RANGE_SW_ERR, &tmp);
+ if (ret < 0) {
+ dev_err(dev, "failed to read range software error\n");
+ return ret;
+ }
+ calib->range_sw_err = FIELD_GET(BME680_RSERROR_MASK, tmp);
+
+ return 0;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L876
+ *
+ * Returns temperature measurement in DegC, resolutions is 0.01 DegC. Therefore,
+ * output value of "3233" represents 32.33 DegC.
+ */
+static s16 bme680_compensate_temp(struct bme680_data *data,
+ s32 adc_temp)
+{
+ struct bme680_calib *calib = &data->bme680;
+ s64 var1, var2, var3;
+ s16 calc_temp;
+
+ /* If the calibration is invalid, attempt to reload it */
+ if (!calib->par_t2)
+ bme680_read_calib(data, calib);
+
+ var1 = (adc_temp >> 3) - (calib->par_t1 << 1);
+ var2 = (var1 * calib->par_t2) >> 11;
+ var3 = ((var1 >> 1) * (var1 >> 1)) >> 12;
+ var3 = (var3 * (calib->par_t3 << 4)) >> 14;
+ data->t_fine = var2 + var3;
+ calc_temp = (data->t_fine * 5 + 128) >> 8;
+
+ return calc_temp;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L896
+ *
+ * Returns pressure measurement in Pa. Output value of "97356" represents
+ * 97356 Pa = 973.56 hPa.
+ */
+static u32 bme680_compensate_press(struct bme680_data *data,
+ u32 adc_press)
+{
+ struct bme680_calib *calib = &data->bme680;
+ s32 var1, var2, var3, press_comp;
+
+ var1 = (data->t_fine >> 1) - 64000;
+ var2 = ((((var1 >> 2) * (var1 >> 2)) >> 11) * calib->par_p6) >> 2;
+ var2 = var2 + (var1 * calib->par_p5 << 1);
+ var2 = (var2 >> 2) + (calib->par_p4 << 16);
+ var1 = (((((var1 >> 2) * (var1 >> 2)) >> 13) *
+ (calib->par_p3 << 5)) >> 3) +
+ ((calib->par_p2 * var1) >> 1);
+ var1 = var1 >> 18;
+ var1 = ((32768 + var1) * calib->par_p1) >> 15;
+ press_comp = 1048576 - adc_press;
+ press_comp = ((press_comp - (var2 >> 12)) * 3125);
+
+ if (press_comp >= BME680_MAX_OVERFLOW_VAL)
+ press_comp = ((press_comp / (u32)var1) << 1);
+ else
+ press_comp = ((press_comp << 1) / (u32)var1);
+
+ var1 = (calib->par_p9 * (((press_comp >> 3) *
+ (press_comp >> 3)) >> 13)) >> 12;
+ var2 = ((press_comp >> 2) * calib->par_p8) >> 13;
+ var3 = ((press_comp >> 8) * (press_comp >> 8) *
+ (press_comp >> 8) * calib->par_p10) >> 17;
+
+ press_comp += (var1 + var2 + var3 + (calib->par_p7 << 7)) >> 4;
+
+ return press_comp;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L937
+ *
+ * Returns humidity measurement in percent, resolution is 0.001 percent. Output
+ * value of "43215" represents 43.215 %rH.
+ */
+static u32 bme680_compensate_humid(struct bme680_data *data,
+ u16 adc_humid)
+{
+ struct bme680_calib *calib = &data->bme680;
+ s32 var1, var2, var3, var4, var5, var6, temp_scaled, calc_hum;
+
+ temp_scaled = (data->t_fine * 5 + 128) >> 8;
+ var1 = (adc_humid - ((s32) ((s32) calib->par_h1 * 16))) -
+ (((temp_scaled * (s32) calib->par_h3) / 100) >> 1);
+ var2 = ((s32) calib->par_h2 *
+ (((temp_scaled * calib->par_h4) / 100) +
+ (((temp_scaled * ((temp_scaled * calib->par_h5) / 100))
+ >> 6) / 100) + (1 << 14))) >> 10;
+ var3 = var1 * var2;
+ var4 = calib->par_h6 << 7;
+ var4 = (var4 + ((temp_scaled * calib->par_h7) / 100)) >> 4;
+ var5 = ((var3 >> 14) * (var3 >> 14)) >> 10;
+ var6 = (var4 * var5) >> 1;
+ calc_hum = (((var3 + var6) >> 10) * 1000) >> 12;
+
+ calc_hum = clamp(calc_hum, 0, 100000); /* clamp between 0-100 %rH */
+
+ return calc_hum;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L973
+ *
+ * Returns gas measurement in Ohm. Output value of "82986" represent 82986 ohms.
+ */
+static u32 bme680_compensate_gas(struct bme680_data *data, u16 gas_res_adc,
+ u8 gas_range)
+{
+ struct bme680_calib *calib = &data->bme680;
+ s64 var1;
+ u64 var2;
+ s64 var3;
+ u32 calc_gas_res;
+
+ /* Look up table for the possible gas range values */
+ const u32 lookupTable[16] = {2147483647u, 2147483647u,
+ 2147483647u, 2147483647u, 2147483647u,
+ 2126008810u, 2147483647u, 2130303777u,
+ 2147483647u, 2147483647u, 2143188679u,
+ 2136746228u, 2147483647u, 2126008810u,
+ 2147483647u, 2147483647u};
+
+ var1 = ((1340 + (5 * (s64) calib->range_sw_err)) *
+ ((s64) lookupTable[gas_range])) >> 16;
+ var2 = ((gas_res_adc << 15) - 16777216) + var1;
+ var3 = ((125000 << (15 - gas_range)) * var1) >> 9;
+ var3 += (var2 >> 1);
+ calc_gas_res = div64_s64(var3, (s64) var2);
+
+ return calc_gas_res;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L1002
+ */
+static u8 bme680_calc_heater_res(struct bme680_data *data, u16 temp)
+{
+ struct bme680_calib *calib = &data->bme680;
+ s32 var1, var2, var3, var4, var5, heatr_res_x100;
+ u8 heatr_res;
+
+ if (temp > 400) /* Cap temperature */
+ temp = 400;
+
+ var1 = (((s32) BME680_AMB_TEMP * calib->par_gh3) / 1000) * 256;
+ var2 = (calib->par_gh1 + 784) * (((((calib->par_gh2 + 154009) *
+ temp * 5) / 100)
+ + 3276800) / 10);
+ var3 = var1 + (var2 / 2);
+ var4 = (var3 / (calib->res_heat_range + 4));
+ var5 = 131 * calib->res_heat_val + 65536;
+ heatr_res_x100 = ((var4 / var5) - 250) * 34;
+ heatr_res = (heatr_res_x100 + 50) / 100;
+
+ return heatr_res;
+}
+
+/*
+ * Taken from Bosch BME680 API:
+ * https://github.com/BoschSensortec/BME680_driver/blob/63bb5336/bme680.c#L1188
+ */
+static u8 bme680_calc_heater_dur(u16 dur)
+{
+ u8 durval, factor = 0;
+
+ if (dur >= 0xfc0) {
+ durval = 0xff; /* Max duration */
+ } else {
+ while (dur > 0x3F) {
+ dur = dur / 4;
+ factor += 1;
+ }
+ durval = dur + (factor * 64);
+ }
+
+ return durval;
+}
+
+static int bme680_set_mode(struct bme680_data *data, bool mode)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+
+ if (mode) {
+ ret = regmap_write_bits(data->regmap, BME680_REG_CTRL_MEAS,
+ BME680_MODE_MASK, BME680_MODE_FORCED);
+ if (ret < 0)
+ dev_err(dev, "failed to set forced mode\n");
+
+ } else {
+ ret = regmap_write_bits(data->regmap, BME680_REG_CTRL_MEAS,
+ BME680_MODE_MASK, BME680_MODE_SLEEP);
+ if (ret < 0)
+ dev_err(dev, "failed to set sleep mode\n");
+
+ }
+
+ return ret;
+}
+
+static u8 bme680_oversampling_to_reg(u8 val)
+{
+ return ilog2(val) + 1;
+}
+
+static int bme680_chip_config(struct bme680_data *data)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+ u8 osrs;
+
+ osrs = FIELD_PREP(
+ BME680_OSRS_HUMIDITY_MASK,
+ bme680_oversampling_to_reg(data->oversampling_humid));
+ /*
+ * Highly recommended to set oversampling of humidity before
+ * temperature/pressure oversampling.
+ */
+ ret = regmap_update_bits(data->regmap, BME680_REG_CTRL_HUMIDITY,
+ BME680_OSRS_HUMIDITY_MASK, osrs);
+ if (ret < 0) {
+ dev_err(dev, "failed to write ctrl_hum register\n");
+ return ret;
+ }
+
+ /* IIR filter settings */
+ ret = regmap_update_bits(data->regmap, BME680_REG_CONFIG,
+ BME680_FILTER_MASK,
+ BME680_FILTER_COEFF_VAL);
+ if (ret < 0) {
+ dev_err(dev, "failed to write config register\n");
+ return ret;
+ }
+
+ osrs = FIELD_PREP(BME680_OSRS_TEMP_MASK,
+ bme680_oversampling_to_reg(data->oversampling_temp)) |
+ FIELD_PREP(BME680_OSRS_PRESS_MASK,
+ bme680_oversampling_to_reg(data->oversampling_press));
+ ret = regmap_write_bits(data->regmap, BME680_REG_CTRL_MEAS,
+ BME680_OSRS_TEMP_MASK | BME680_OSRS_PRESS_MASK,
+ osrs);
+ if (ret < 0)
+ dev_err(dev, "failed to write ctrl_meas register\n");
+
+ return ret;
+}
+
+static int bme680_gas_config(struct bme680_data *data)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+ u8 heatr_res, heatr_dur;
+
+ heatr_res = bme680_calc_heater_res(data, data->heater_temp);
+
+ /* set target heater temperature */
+ ret = regmap_write(data->regmap, BME680_REG_RES_HEAT_0, heatr_res);
+ if (ret < 0) {
+ dev_err(dev, "failed to write res_heat_0 register\n");
+ return ret;
+ }
+
+ heatr_dur = bme680_calc_heater_dur(data->heater_dur);
+
+ /* set target heating duration */
+ ret = regmap_write(data->regmap, BME680_REG_GAS_WAIT_0, heatr_dur);
+ if (ret < 0) {
+ dev_err(dev, "failed to write gas_wait_0 register\n");
+ return ret;
+ }
+
+ /* Enable the gas sensor and select heater profile set-point 0 */
+ ret = regmap_update_bits(data->regmap, BME680_REG_CTRL_GAS_1,
+ BME680_RUN_GAS_MASK | BME680_NB_CONV_MASK,
+ FIELD_PREP(BME680_RUN_GAS_MASK, 1) |
+ FIELD_PREP(BME680_NB_CONV_MASK, 0));
+ if (ret < 0)
+ dev_err(dev, "failed to write ctrl_gas_1 register\n");
+
+ return ret;
+}
+
+static int bme680_read_temp(struct bme680_data *data, int *val)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+ __be32 tmp = 0;
+ s32 adc_temp;
+ s16 comp_temp;
+
+ /* set forced mode to trigger measurement */
+ ret = bme680_set_mode(data, true);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_bulk_read(data->regmap, BME680_REG_TEMP_MSB,
+ &tmp, 3);
+ if (ret < 0) {
+ dev_err(dev, "failed to read temperature\n");
+ return ret;
+ }
+
+ adc_temp = be32_to_cpu(tmp) >> 12;
+ if (adc_temp == BME680_MEAS_SKIPPED) {
+ /* reading was skipped */
+ dev_err(dev, "reading temperature skipped\n");
+ return -EINVAL;
+ }
+ comp_temp = bme680_compensate_temp(data, adc_temp);
+ /*
+ * val might be NULL if we're called by the read_press/read_humid
+ * routine which is callled to get t_fine value used in
+ * compensate_press/compensate_humid to get compensated
+ * pressure/humidity readings.
+ */
+ if (val) {
+ *val = comp_temp * 10; /* Centidegrees to millidegrees */
+ return IIO_VAL_INT;
+ }
+
+ return ret;
+}
+
+static int bme680_read_press(struct bme680_data *data,
+ int *val, int *val2)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+ __be32 tmp = 0;
+ s32 adc_press;
+
+ /* Read and compensate temperature to get a reading of t_fine */
+ ret = bme680_read_temp(data, NULL);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_bulk_read(data->regmap, BME680_REG_PRESS_MSB,
+ &tmp, 3);
+ if (ret < 0) {
+ dev_err(dev, "failed to read pressure\n");
+ return ret;
+ }
+
+ adc_press = be32_to_cpu(tmp) >> 12;
+ if (adc_press == BME680_MEAS_SKIPPED) {
+ /* reading was skipped */
+ dev_err(dev, "reading pressure skipped\n");
+ return -EINVAL;
+ }
+
+ *val = bme680_compensate_press(data, adc_press);
+ *val2 = 100;
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int bme680_read_humid(struct bme680_data *data,
+ int *val, int *val2)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+ __be16 tmp = 0;
+ s32 adc_humidity;
+ u32 comp_humidity;
+
+ /* Read and compensate temperature to get a reading of t_fine */
+ ret = bme680_read_temp(data, NULL);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_bulk_read(data->regmap, BM6880_REG_HUMIDITY_MSB,
+ &tmp, sizeof(tmp));
+ if (ret < 0) {
+ dev_err(dev, "failed to read humidity\n");
+ return ret;
+ }
+
+ adc_humidity = be16_to_cpu(tmp);
+ if (adc_humidity == BME680_MEAS_SKIPPED) {
+ /* reading was skipped */
+ dev_err(dev, "reading humidity skipped\n");
+ return -EINVAL;
+ }
+ comp_humidity = bme680_compensate_humid(data, adc_humidity);
+
+ *val = comp_humidity;
+ *val2 = 1000;
+ return IIO_VAL_FRACTIONAL;
+}
+
+static int bme680_read_gas(struct bme680_data *data,
+ int *val)
+{
+ struct device *dev = regmap_get_device(data->regmap);
+ int ret;
+ __be16 tmp = 0;
+ unsigned int check;
+ u16 adc_gas_res;
+ u8 gas_range;
+
+ /* Set heater settings */
+ ret = bme680_gas_config(data);
+ if (ret < 0) {
+ dev_err(dev, "failed to set gas config\n");
+ return ret;
+ }
+
+ /* set forced mode to trigger measurement */
+ ret = bme680_set_mode(data, true);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_read(data->regmap, BME680_REG_MEAS_STAT_0, &check);
+ if (check & BME680_GAS_MEAS_BIT) {
+ dev_err(dev, "gas measurement incomplete\n");
+ return -EBUSY;
+ }
+
+ ret = regmap_read(data->regmap, BME680_REG_GAS_R_LSB, &check);
+ if (ret < 0) {
+ dev_err(dev, "failed to read gas_r_lsb register\n");
+ return ret;
+ }
+
+ /*
+ * occurs if either the gas heating duration was insuffient
+ * to reach the target heater temperature or the target
+ * heater temperature was too high for the heater sink to
+ * reach.
+ */
+ if ((check & BME680_GAS_STAB_BIT) == 0) {
+ dev_err(dev, "heater failed to reach the target temperature\n");
+ return -EINVAL;
+ }
+
+ ret = regmap_bulk_read(data->regmap, BME680_REG_GAS_MSB,
+ &tmp, sizeof(tmp));
+ if (ret < 0) {
+ dev_err(dev, "failed to read gas resistance\n");
+ return ret;
+ }
+
+ gas_range = check & BME680_GAS_RANGE_MASK;
+ adc_gas_res = be16_to_cpu(tmp) >> BME680_ADC_GAS_RES_SHIFT;
+
+ *val = bme680_compensate_gas(data, adc_gas_res, gas_range);
+ return IIO_VAL_INT;
+}
+
+static int bme680_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct bme680_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (chan->type) {
+ case IIO_TEMP:
+ return bme680_read_temp(data, val);
+ case IIO_PRESSURE:
+ return bme680_read_press(data, val, val2);
+ case IIO_HUMIDITYRELATIVE:
+ return bme680_read_humid(data, val, val2);
+ case IIO_RESISTANCE:
+ return bme680_read_gas(data, val);
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ switch (chan->type) {
+ case IIO_TEMP:
+ *val = data->oversampling_temp;
+ return IIO_VAL_INT;
+ case IIO_PRESSURE:
+ *val = data->oversampling_press;
+ return IIO_VAL_INT;
+ case IIO_HUMIDITYRELATIVE:
+ *val = data->oversampling_humid;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static bool bme680_is_valid_oversampling(int rate)
+{
+ return (rate > 0 && rate <= 16 && is_power_of_2(rate));
+}
+
+static int bme680_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct bme680_data *data = iio_priv(indio_dev);
+
+ if (val2 != 0)
+ return -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+ {
+ if (!bme680_is_valid_oversampling(val))
+ return -EINVAL;
+
+ switch (chan->type) {
+ case IIO_TEMP:
+ data->oversampling_temp = val;
+ break;
+ case IIO_PRESSURE:
+ data->oversampling_press = val;
+ break;
+ case IIO_HUMIDITYRELATIVE:
+ data->oversampling_humid = val;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return bme680_chip_config(data);
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static const char bme680_oversampling_ratio_show[] = "1 2 4 8 16";
+
+static IIO_CONST_ATTR(oversampling_ratio_available,
+ bme680_oversampling_ratio_show);
+
+static struct attribute *bme680_attributes[] = {
+ &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group bme680_attribute_group = {
+ .attrs = bme680_attributes,
+};
+
+static const struct iio_info bme680_info = {
+ .read_raw = &bme680_read_raw,
+ .write_raw = &bme680_write_raw,
+ .attrs = &bme680_attribute_group,
+};
+
+static const char *bme680_match_acpi_device(struct device *dev)
+{
+ const struct acpi_device_id *id;
+
+ id = acpi_match_device(dev->driver->acpi_match_table, dev);
+ if (!id)
+ return NULL;
+
+ return dev_name(dev);
+}
+
+int bme680_core_probe(struct device *dev, struct regmap *regmap,
+ const char *name)
+{
+ struct iio_dev *indio_dev;
+ struct bme680_data *data;
+ unsigned int val;
+ int ret;
+
+ ret = regmap_write(regmap, BME680_REG_SOFT_RESET,
+ BME680_CMD_SOFTRESET);
+ if (ret < 0) {
+ dev_err(dev, "Failed to reset chip\n");
+ return ret;
+ }
+
+ ret = regmap_read(regmap, BME680_REG_CHIP_ID, &val);
+ if (ret < 0) {
+ dev_err(dev, "Error reading chip ID\n");
+ return ret;
+ }
+
+ if (val != BME680_CHIP_ID_VAL) {
+ dev_err(dev, "Wrong chip ID, got %x expected %x\n",
+ val, BME680_CHIP_ID_VAL);
+ return -ENODEV;
+ }
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ if (!name && ACPI_HANDLE(dev))
+ name = bme680_match_acpi_device(dev);
+
+ data = iio_priv(indio_dev);
+ dev_set_drvdata(dev, indio_dev);
+ data->regmap = regmap;
+ indio_dev->name = name;
+ indio_dev->channels = bme680_channels;
+ indio_dev->num_channels = ARRAY_SIZE(bme680_channels);
+ indio_dev->info = &bme680_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ /* default values for the sensor */
+ data->oversampling_humid = 2; /* 2X oversampling rate */
+ data->oversampling_press = 4; /* 4X oversampling rate */
+ data->oversampling_temp = 8; /* 8X oversampling rate */
+ data->heater_temp = 320; /* degree Celsius */
+ data->heater_dur = 150; /* milliseconds */
+
+ ret = bme680_chip_config(data);
+ if (ret < 0) {
+ dev_err(dev, "failed to set chip_config data\n");
+ return ret;
+ }
+
+ ret = bme680_gas_config(data);
+ if (ret < 0) {
+ dev_err(dev, "failed to set gas config data\n");
+ return ret;
+ }
+
+ ret = bme680_read_calib(data, &data->bme680);
+ if (ret < 0) {
+ dev_err(dev,
+ "failed to read calibration coefficients at probe\n");
+ return ret;
+ }
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+EXPORT_SYMBOL_GPL(bme680_core_probe);
+
+MODULE_AUTHOR("Himanshu Jha <himanshujha199640@gmail.com>");
+MODULE_DESCRIPTION("Bosch BME680 Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/bme680_i2c.c b/drivers/iio/chemical/bme680_i2c.c
new file mode 100644
index 000000000..de9c9e3d2
--- /dev/null
+++ b/drivers/iio/chemical/bme680_i2c.c
@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * BME680 - I2C Driver
+ *
+ * Copyright (C) 2018 Himanshu Jha <himanshujha199640@gmail.com>
+ *
+ * 7-Bit I2C slave address is:
+ * - 0x76 if SDO is pulled to GND
+ * - 0x77 if SDO is pulled to VDDIO
+ *
+ * Note: SDO pin cannot be left floating otherwise I2C address
+ * will be undefined.
+ */
+#include <linux/acpi.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include "bme680.h"
+
+static int bme680_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct regmap *regmap;
+ const char *name = NULL;
+
+ regmap = devm_regmap_init_i2c(client, &bme680_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&client->dev, "Failed to register i2c regmap %d\n",
+ (int)PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ if (id)
+ name = id->name;
+
+ return bme680_core_probe(&client->dev, regmap, name);
+}
+
+static const struct i2c_device_id bme680_i2c_id[] = {
+ {"bme680", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, bme680_i2c_id);
+
+static const struct acpi_device_id bme680_acpi_match[] = {
+ {"BME0680", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, bme680_acpi_match);
+
+static const struct of_device_id bme680_of_i2c_match[] = {
+ { .compatible = "bosch,bme680", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bme680_of_i2c_match);
+
+static struct i2c_driver bme680_i2c_driver = {
+ .driver = {
+ .name = "bme680_i2c",
+ .acpi_match_table = ACPI_PTR(bme680_acpi_match),
+ .of_match_table = bme680_of_i2c_match,
+ },
+ .probe = bme680_i2c_probe,
+ .id_table = bme680_i2c_id,
+};
+module_i2c_driver(bme680_i2c_driver);
+
+MODULE_AUTHOR("Himanshu Jha <himanshujha199640@gmail.com>");
+MODULE_DESCRIPTION("BME680 I2C driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/bme680_spi.c b/drivers/iio/chemical/bme680_spi.c
new file mode 100644
index 000000000..3b838068a
--- /dev/null
+++ b/drivers/iio/chemical/bme680_spi.c
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * BME680 - SPI Driver
+ *
+ * Copyright (C) 2018 Himanshu Jha <himanshujha199640@gmail.com>
+ */
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+
+#include "bme680.h"
+
+struct bme680_spi_bus_context {
+ struct spi_device *spi;
+ u8 current_page;
+};
+
+/*
+ * In SPI mode there are only 7 address bits, a "page" register determines
+ * which part of the 8-bit range is active. This function looks at the address
+ * and writes the page selection bit if needed
+ */
+static int bme680_regmap_spi_select_page(
+ struct bme680_spi_bus_context *ctx, u8 reg)
+{
+ struct spi_device *spi = ctx->spi;
+ int ret;
+ u8 buf[2];
+ u8 page = (reg & 0x80) ? 0 : 1; /* Page "1" is low range */
+
+ if (page == ctx->current_page)
+ return 0;
+
+ /*
+ * Data sheet claims we're only allowed to change bit 4, so we must do
+ * a read-modify-write on each and every page select
+ */
+ buf[0] = BME680_REG_STATUS;
+ ret = spi_write_then_read(spi, buf, 1, buf + 1, 1);
+ if (ret < 0) {
+ dev_err(&spi->dev, "failed to set page %u\n", page);
+ return ret;
+ }
+
+ buf[0] = BME680_REG_STATUS;
+ if (page)
+ buf[1] |= BME680_SPI_MEM_PAGE_BIT;
+ else
+ buf[1] &= ~BME680_SPI_MEM_PAGE_BIT;
+
+ ret = spi_write(spi, buf, 2);
+ if (ret < 0) {
+ dev_err(&spi->dev, "failed to set page %u\n", page);
+ return ret;
+ }
+
+ ctx->current_page = page;
+
+ return 0;
+}
+
+static int bme680_regmap_spi_write(void *context, const void *data,
+ size_t count)
+{
+ struct bme680_spi_bus_context *ctx = context;
+ struct spi_device *spi = ctx->spi;
+ int ret;
+ u8 buf[2];
+
+ memcpy(buf, data, 2);
+
+ ret = bme680_regmap_spi_select_page(ctx, buf[0]);
+ if (ret)
+ return ret;
+
+ /*
+ * The SPI register address (= full register address without bit 7)
+ * and the write command (bit7 = RW = '0')
+ */
+ buf[0] &= ~0x80;
+
+ return spi_write(spi, buf, 2);
+}
+
+static int bme680_regmap_spi_read(void *context, const void *reg,
+ size_t reg_size, void *val, size_t val_size)
+{
+ struct bme680_spi_bus_context *ctx = context;
+ struct spi_device *spi = ctx->spi;
+ int ret;
+ u8 addr = *(const u8 *)reg;
+
+ ret = bme680_regmap_spi_select_page(ctx, addr);
+ if (ret)
+ return ret;
+
+ addr |= 0x80; /* bit7 = RW = '1' */
+
+ return spi_write_then_read(spi, &addr, 1, val, val_size);
+}
+
+static struct regmap_bus bme680_regmap_bus = {
+ .write = bme680_regmap_spi_write,
+ .read = bme680_regmap_spi_read,
+ .reg_format_endian_default = REGMAP_ENDIAN_BIG,
+ .val_format_endian_default = REGMAP_ENDIAN_BIG,
+};
+
+static int bme680_spi_probe(struct spi_device *spi)
+{
+ const struct spi_device_id *id = spi_get_device_id(spi);
+ struct bme680_spi_bus_context *bus_context;
+ struct regmap *regmap;
+ int ret;
+
+ spi->bits_per_word = 8;
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ dev_err(&spi->dev, "spi_setup failed!\n");
+ return ret;
+ }
+
+ bus_context = devm_kzalloc(&spi->dev, sizeof(*bus_context), GFP_KERNEL);
+ if (!bus_context)
+ return -ENOMEM;
+
+ bus_context->spi = spi;
+ bus_context->current_page = 0xff; /* Undefined on warm boot */
+
+ regmap = devm_regmap_init(&spi->dev, &bme680_regmap_bus,
+ bus_context, &bme680_regmap_config);
+ if (IS_ERR(regmap)) {
+ dev_err(&spi->dev, "Failed to register spi regmap %d\n",
+ (int)PTR_ERR(regmap));
+ return PTR_ERR(regmap);
+ }
+
+ return bme680_core_probe(&spi->dev, regmap, id->name);
+}
+
+static const struct spi_device_id bme680_spi_id[] = {
+ {"bme680", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(spi, bme680_spi_id);
+
+static const struct acpi_device_id bme680_acpi_match[] = {
+ {"BME0680", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(acpi, bme680_acpi_match);
+
+static const struct of_device_id bme680_of_spi_match[] = {
+ { .compatible = "bosch,bme680", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bme680_of_spi_match);
+
+static struct spi_driver bme680_spi_driver = {
+ .driver = {
+ .name = "bme680_spi",
+ .acpi_match_table = ACPI_PTR(bme680_acpi_match),
+ .of_match_table = bme680_of_spi_match,
+ },
+ .probe = bme680_spi_probe,
+ .id_table = bme680_spi_id,
+};
+module_spi_driver(bme680_spi_driver);
+
+MODULE_AUTHOR("Himanshu Jha <himanshujha199640@gmail.com>");
+MODULE_DESCRIPTION("Bosch BME680 SPI driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/ccs811.c b/drivers/iio/chemical/ccs811.c
new file mode 100644
index 000000000..384d167b4
--- /dev/null
+++ b/drivers/iio/chemical/ccs811.c
@@ -0,0 +1,575 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ccs811.c - Support for AMS CCS811 VOC Sensor
+ *
+ * Copyright (C) 2017 Narcisa Vasile <narcisaanamaria12@gmail.com>
+ *
+ * Datasheet: ams.com/content/download/951091/2269479/CCS811_DS000459_3-00.pdf
+ *
+ * IIO driver for AMS CCS811 (I2C address 0x5A/0x5B set by ADDR Low/High)
+ *
+ * TODO:
+ * 1. Make the drive mode selectable form userspace
+ * 2. Add support for interrupts
+ * 3. Adjust time to wait for data to be ready based on selected operation mode
+ * 4. Read error register and put the information in logs
+ */
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/module.h>
+
+#define CCS811_STATUS 0x00
+#define CCS811_MEAS_MODE 0x01
+#define CCS811_ALG_RESULT_DATA 0x02
+#define CCS811_RAW_DATA 0x03
+#define CCS811_HW_ID 0x20
+#define CCS811_HW_ID_VALUE 0x81
+#define CCS811_HW_VERSION 0x21
+#define CCS811_HW_VERSION_VALUE 0x10
+#define CCS811_HW_VERSION_MASK 0xF0
+#define CCS811_ERR 0xE0
+/* Used to transition from boot to application mode */
+#define CCS811_APP_START 0xF4
+#define CCS811_SW_RESET 0xFF
+
+/* Status register flags */
+#define CCS811_STATUS_ERROR BIT(0)
+#define CCS811_STATUS_DATA_READY BIT(3)
+#define CCS811_STATUS_APP_VALID_MASK BIT(4)
+#define CCS811_STATUS_APP_VALID_LOADED BIT(4)
+/*
+ * Value of FW_MODE bit of STATUS register describes the sensor's state:
+ * 0: Firmware is in boot mode, this allows new firmware to be loaded
+ * 1: Firmware is in application mode. CCS811 is ready to take ADC measurements
+ */
+#define CCS811_STATUS_FW_MODE_MASK BIT(7)
+#define CCS811_STATUS_FW_MODE_APPLICATION BIT(7)
+
+/* Measurement modes */
+#define CCS811_MODE_IDLE 0x00
+#define CCS811_MODE_IAQ_1SEC 0x10
+#define CCS811_MODE_IAQ_10SEC 0x20
+#define CCS811_MODE_IAQ_60SEC 0x30
+#define CCS811_MODE_RAW_DATA 0x40
+
+#define CCS811_MEAS_MODE_INTERRUPT BIT(3)
+
+#define CCS811_VOLTAGE_MASK 0x3FF
+
+struct ccs811_reading {
+ __be16 co2;
+ __be16 voc;
+ u8 status;
+ u8 error;
+ __be16 raw_data;
+} __attribute__((__packed__));
+
+struct ccs811_data {
+ struct i2c_client *client;
+ struct mutex lock; /* Protect readings */
+ struct ccs811_reading buffer;
+ struct iio_trigger *drdy_trig;
+ struct gpio_desc *wakeup_gpio;
+ bool drdy_trig_on;
+ /* Ensures correct alignment of timestamp if present */
+ struct {
+ s16 channels[2];
+ s64 ts __aligned(8);
+ } scan;
+};
+
+static const struct iio_chan_spec ccs811_channels[] = {
+ {
+ .type = IIO_CURRENT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = -1,
+ }, {
+ .type = IIO_VOLTAGE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = -1,
+ }, {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_CO2,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_BE,
+ },
+ }, {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_VOC,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_BE,
+ },
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(2),
+};
+
+/*
+ * The CCS811 powers-up in boot mode. A setup write to CCS811_APP_START will
+ * transition the sensor to application mode.
+ */
+static int ccs811_start_sensor_application(struct i2c_client *client)
+{
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(client, CCS811_STATUS);
+ if (ret < 0)
+ return ret;
+
+ if ((ret & CCS811_STATUS_FW_MODE_APPLICATION))
+ return 0;
+
+ if ((ret & CCS811_STATUS_APP_VALID_MASK) !=
+ CCS811_STATUS_APP_VALID_LOADED)
+ return -EIO;
+
+ ret = i2c_smbus_write_byte(client, CCS811_APP_START);
+ if (ret < 0)
+ return ret;
+
+ ret = i2c_smbus_read_byte_data(client, CCS811_STATUS);
+ if (ret < 0)
+ return ret;
+
+ if ((ret & CCS811_STATUS_FW_MODE_MASK) !=
+ CCS811_STATUS_FW_MODE_APPLICATION) {
+ dev_err(&client->dev, "Application failed to start. Sensor is still in boot mode.\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int ccs811_setup(struct i2c_client *client)
+{
+ int ret;
+
+ ret = ccs811_start_sensor_application(client);
+ if (ret < 0)
+ return ret;
+
+ return i2c_smbus_write_byte_data(client, CCS811_MEAS_MODE,
+ CCS811_MODE_IAQ_1SEC);
+}
+
+static void ccs811_set_wakeup(struct ccs811_data *data, bool enable)
+{
+ if (!data->wakeup_gpio)
+ return;
+
+ gpiod_set_value(data->wakeup_gpio, enable);
+
+ if (enable)
+ usleep_range(50, 60);
+ else
+ usleep_range(20, 30);
+}
+
+static int ccs811_get_measurement(struct ccs811_data *data)
+{
+ int ret, tries = 11;
+
+ ccs811_set_wakeup(data, true);
+
+ /* Maximum waiting time: 1s, as measurements are made every second */
+ while (tries-- > 0) {
+ ret = i2c_smbus_read_byte_data(data->client, CCS811_STATUS);
+ if (ret < 0)
+ return ret;
+
+ if ((ret & CCS811_STATUS_DATA_READY) || tries == 0)
+ break;
+ msleep(100);
+ }
+ if (!(ret & CCS811_STATUS_DATA_READY))
+ return -EIO;
+
+ ret = i2c_smbus_read_i2c_block_data(data->client,
+ CCS811_ALG_RESULT_DATA, 8,
+ (char *)&data->buffer);
+ ccs811_set_wakeup(data, false);
+
+ return ret;
+}
+
+static int ccs811_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct ccs811_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ return ret;
+ mutex_lock(&data->lock);
+ ret = ccs811_get_measurement(data);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ iio_device_release_direct_mode(indio_dev);
+ return ret;
+ }
+
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ *val = be16_to_cpu(data->buffer.raw_data) &
+ CCS811_VOLTAGE_MASK;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CURRENT:
+ *val = be16_to_cpu(data->buffer.raw_data) >> 10;
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CONCENTRATION:
+ switch (chan->channel2) {
+ case IIO_MOD_CO2:
+ *val = be16_to_cpu(data->buffer.co2);
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_MOD_VOC:
+ *val = be16_to_cpu(data->buffer.voc);
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ break;
+ default:
+ ret = -EINVAL;
+ }
+ mutex_unlock(&data->lock);
+ iio_device_release_direct_mode(indio_dev);
+
+ return ret;
+
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_VOLTAGE:
+ *val = 1;
+ *val2 = 612903;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CURRENT:
+ *val = 0;
+ *val2 = 1000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CONCENTRATION:
+ switch (chan->channel2) {
+ case IIO_MOD_CO2:
+ *val = 0;
+ *val2 = 100;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_MOD_VOC:
+ *val = 0;
+ *val2 = 100;
+ return IIO_VAL_INT_PLUS_NANO;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_info ccs811_info = {
+ .read_raw = ccs811_read_raw,
+};
+
+static int ccs811_set_trigger_state(struct iio_trigger *trig,
+ bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct ccs811_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = i2c_smbus_read_byte_data(data->client, CCS811_MEAS_MODE);
+ if (ret < 0)
+ return ret;
+
+ if (state)
+ ret |= CCS811_MEAS_MODE_INTERRUPT;
+ else
+ ret &= ~CCS811_MEAS_MODE_INTERRUPT;
+
+ data->drdy_trig_on = state;
+
+ return i2c_smbus_write_byte_data(data->client, CCS811_MEAS_MODE, ret);
+}
+
+static const struct iio_trigger_ops ccs811_trigger_ops = {
+ .set_trigger_state = ccs811_set_trigger_state,
+};
+
+static irqreturn_t ccs811_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct ccs811_data *data = iio_priv(indio_dev);
+ struct i2c_client *client = data->client;
+ int ret;
+
+ ret = i2c_smbus_read_i2c_block_data(client, CCS811_ALG_RESULT_DATA,
+ sizeof(data->scan.channels),
+ (u8 *)data->scan.channels);
+ if (ret != 4) {
+ dev_err(&client->dev, "cannot read sensor data\n");
+ goto err;
+ }
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
+ iio_get_time_ns(indio_dev));
+
+err:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ccs811_data_rdy_trigger_poll(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct ccs811_data *data = iio_priv(indio_dev);
+
+ if (data->drdy_trig_on)
+ iio_trigger_poll(data->drdy_trig);
+
+ return IRQ_HANDLED;
+}
+
+static int ccs811_reset(struct i2c_client *client)
+{
+ struct gpio_desc *reset_gpio;
+ int ret;
+
+ reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(reset_gpio))
+ return PTR_ERR(reset_gpio);
+
+ /* Try to reset using nRESET pin if available else do SW reset */
+ if (reset_gpio) {
+ gpiod_set_value(reset_gpio, 1);
+ usleep_range(20, 30);
+ gpiod_set_value(reset_gpio, 0);
+ } else {
+ /*
+ * As per the datasheet, this sequence of values needs to be
+ * written to the SW_RESET register for triggering the soft
+ * reset in the device and placing it in boot mode.
+ */
+ static const u8 reset_seq[] = {
+ 0x11, 0xE5, 0x72, 0x8A,
+ };
+
+ ret = i2c_smbus_write_i2c_block_data(client, CCS811_SW_RESET,
+ sizeof(reset_seq), reset_seq);
+ if (ret < 0) {
+ dev_err(&client->dev, "Failed to reset sensor\n");
+ return ret;
+ }
+ }
+
+ /* tSTART delay required after reset */
+ usleep_range(1000, 2000);
+
+ return 0;
+}
+
+static int ccs811_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct iio_dev *indio_dev;
+ struct ccs811_data *data;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
+ | I2C_FUNC_SMBUS_BYTE_DATA
+ | I2C_FUNC_SMBUS_READ_I2C_BLOCK))
+ return -EOPNOTSUPP;
+
+ 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;
+
+ data->wakeup_gpio = devm_gpiod_get_optional(&client->dev, "wakeup",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(data->wakeup_gpio))
+ return PTR_ERR(data->wakeup_gpio);
+
+ ccs811_set_wakeup(data, true);
+
+ ret = ccs811_reset(client);
+ if (ret) {
+ ccs811_set_wakeup(data, false);
+ return ret;
+ }
+
+ /* Check hardware id (should be 0x81 for this family of devices) */
+ ret = i2c_smbus_read_byte_data(client, CCS811_HW_ID);
+ if (ret < 0) {
+ ccs811_set_wakeup(data, false);
+ return ret;
+ }
+
+ if (ret != CCS811_HW_ID_VALUE) {
+ dev_err(&client->dev, "hardware id doesn't match CCS81x\n");
+ ccs811_set_wakeup(data, false);
+ return -ENODEV;
+ }
+
+ ret = i2c_smbus_read_byte_data(client, CCS811_HW_VERSION);
+ if (ret < 0) {
+ ccs811_set_wakeup(data, false);
+ return ret;
+ }
+
+ if ((ret & CCS811_HW_VERSION_MASK) != CCS811_HW_VERSION_VALUE) {
+ dev_err(&client->dev, "no CCS811 sensor\n");
+ ccs811_set_wakeup(data, false);
+ return -ENODEV;
+ }
+
+ ret = ccs811_setup(client);
+ if (ret < 0) {
+ ccs811_set_wakeup(data, false);
+ return ret;
+ }
+
+ ccs811_set_wakeup(data, false);
+
+ mutex_init(&data->lock);
+
+ indio_dev->name = id->name;
+ indio_dev->info = &ccs811_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ indio_dev->channels = ccs811_channels;
+ indio_dev->num_channels = ARRAY_SIZE(ccs811_channels);
+
+ if (client->irq > 0) {
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ ccs811_data_rdy_trigger_poll,
+ NULL,
+ IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ "ccs811_irq", indio_dev);
+ if (ret) {
+ dev_err(&client->dev, "irq request error %d\n", -ret);
+ goto err_poweroff;
+ }
+
+ data->drdy_trig = devm_iio_trigger_alloc(&client->dev,
+ "%s-dev%d",
+ indio_dev->name,
+ indio_dev->id);
+ if (!data->drdy_trig) {
+ ret = -ENOMEM;
+ goto err_poweroff;
+ }
+
+ data->drdy_trig->dev.parent = &client->dev;
+ data->drdy_trig->ops = &ccs811_trigger_ops;
+ iio_trigger_set_drvdata(data->drdy_trig, indio_dev);
+ ret = iio_trigger_register(data->drdy_trig);
+ if (ret)
+ goto err_poweroff;
+
+ indio_dev->trig = iio_trigger_get(data->drdy_trig);
+ }
+
+ ret = iio_triggered_buffer_setup(indio_dev, NULL,
+ ccs811_trigger_handler, NULL);
+
+ if (ret < 0) {
+ dev_err(&client->dev, "triggered buffer setup failed\n");
+ goto err_trigger_unregister;
+ }
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0) {
+ dev_err(&client->dev, "unable to register iio device\n");
+ goto err_buffer_cleanup;
+ }
+ return 0;
+
+err_buffer_cleanup:
+ iio_triggered_buffer_cleanup(indio_dev);
+err_trigger_unregister:
+ if (data->drdy_trig)
+ iio_trigger_unregister(data->drdy_trig);
+err_poweroff:
+ i2c_smbus_write_byte_data(client, CCS811_MEAS_MODE, CCS811_MODE_IDLE);
+
+ return ret;
+}
+
+static int ccs811_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct ccs811_data *data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+ iio_triggered_buffer_cleanup(indio_dev);
+ if (data->drdy_trig)
+ iio_trigger_unregister(data->drdy_trig);
+
+ return i2c_smbus_write_byte_data(client, CCS811_MEAS_MODE,
+ CCS811_MODE_IDLE);
+}
+
+static const struct i2c_device_id ccs811_id[] = {
+ {"ccs811", 0},
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, ccs811_id);
+
+static const struct of_device_id ccs811_dt_ids[] = {
+ { .compatible = "ams,ccs811" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, ccs811_dt_ids);
+
+static struct i2c_driver ccs811_driver = {
+ .driver = {
+ .name = "ccs811",
+ .of_match_table = ccs811_dt_ids,
+ },
+ .probe = ccs811_probe,
+ .remove = ccs811_remove,
+ .id_table = ccs811_id,
+};
+module_i2c_driver(ccs811_driver);
+
+MODULE_AUTHOR("Narcisa Vasile <narcisaanamaria12@gmail.com>");
+MODULE_DESCRIPTION("CCS811 volatile organic compounds sensor");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/pms7003.c b/drivers/iio/chemical/pms7003.c
new file mode 100644
index 000000000..e9d440565
--- /dev/null
+++ b/drivers/iio/chemical/pms7003.c
@@ -0,0 +1,351 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Plantower PMS7003 particulate matter sensor driver
+ *
+ * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
+ */
+
+#include <asm/unaligned.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/serdev.h>
+
+#define PMS7003_DRIVER_NAME "pms7003"
+
+#define PMS7003_MAGIC 0x424d
+/* last 2 data bytes hold frame checksum */
+#define PMS7003_MAX_DATA_LENGTH 28
+#define PMS7003_CHECKSUM_LENGTH 2
+#define PMS7003_PM10_OFFSET 10
+#define PMS7003_PM2P5_OFFSET 8
+#define PMS7003_PM1_OFFSET 6
+
+#define PMS7003_TIMEOUT msecs_to_jiffies(6000)
+#define PMS7003_CMD_LENGTH 7
+#define PMS7003_PM_MAX 1000
+#define PMS7003_PM_MIN 0
+
+enum {
+ PM1,
+ PM2P5,
+ PM10,
+};
+
+enum pms7003_cmd {
+ CMD_WAKEUP,
+ CMD_ENTER_PASSIVE_MODE,
+ CMD_READ_PASSIVE,
+ CMD_SLEEP,
+};
+
+/*
+ * commands have following format:
+ *
+ * +------+------+-----+------+-----+-----------+-----------+
+ * | 0x42 | 0x4d | cmd | 0x00 | arg | cksum msb | cksum lsb |
+ * +------+------+-----+------+-----+-----------+-----------+
+ */
+static const u8 pms7003_cmd_tbl[][PMS7003_CMD_LENGTH] = {
+ [CMD_WAKEUP] = { 0x42, 0x4d, 0xe4, 0x00, 0x01, 0x01, 0x74 },
+ [CMD_ENTER_PASSIVE_MODE] = { 0x42, 0x4d, 0xe1, 0x00, 0x00, 0x01, 0x70 },
+ [CMD_READ_PASSIVE] = { 0x42, 0x4d, 0xe2, 0x00, 0x00, 0x01, 0x71 },
+ [CMD_SLEEP] = { 0x42, 0x4d, 0xe4, 0x00, 0x00, 0x01, 0x73 },
+};
+
+struct pms7003_frame {
+ u8 data[PMS7003_MAX_DATA_LENGTH];
+ u16 expected_length;
+ u16 length;
+};
+
+struct pms7003_state {
+ struct serdev_device *serdev;
+ struct pms7003_frame frame;
+ struct completion frame_ready;
+ struct mutex lock; /* must be held whenever state gets touched */
+ /* Used to construct scan to push to the IIO buffer */
+ struct {
+ u16 data[3]; /* PM1, PM2P5, PM10 */
+ s64 ts;
+ } scan;
+};
+
+static int pms7003_do_cmd(struct pms7003_state *state, enum pms7003_cmd cmd)
+{
+ int ret;
+
+ ret = serdev_device_write(state->serdev, pms7003_cmd_tbl[cmd],
+ PMS7003_CMD_LENGTH, PMS7003_TIMEOUT);
+ if (ret < PMS7003_CMD_LENGTH)
+ return ret < 0 ? ret : -EIO;
+
+ ret = wait_for_completion_interruptible_timeout(&state->frame_ready,
+ PMS7003_TIMEOUT);
+ if (!ret)
+ ret = -ETIMEDOUT;
+
+ return ret < 0 ? ret : 0;
+}
+
+static u16 pms7003_get_pm(const u8 *data)
+{
+ return clamp_val(get_unaligned_be16(data),
+ PMS7003_PM_MIN, PMS7003_PM_MAX);
+}
+
+static irqreturn_t pms7003_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct pms7003_state *state = iio_priv(indio_dev);
+ struct pms7003_frame *frame = &state->frame;
+ int ret;
+
+ mutex_lock(&state->lock);
+ ret = pms7003_do_cmd(state, CMD_READ_PASSIVE);
+ if (ret) {
+ mutex_unlock(&state->lock);
+ goto err;
+ }
+
+ state->scan.data[PM1] =
+ pms7003_get_pm(frame->data + PMS7003_PM1_OFFSET);
+ state->scan.data[PM2P5] =
+ pms7003_get_pm(frame->data + PMS7003_PM2P5_OFFSET);
+ state->scan.data[PM10] =
+ pms7003_get_pm(frame->data + PMS7003_PM10_OFFSET);
+ mutex_unlock(&state->lock);
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &state->scan,
+ iio_get_time_ns(indio_dev));
+err:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int pms7003_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct pms7003_state *state = iio_priv(indio_dev);
+ struct pms7003_frame *frame = &state->frame;
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (chan->type) {
+ case IIO_MASSCONCENTRATION:
+ mutex_lock(&state->lock);
+ ret = pms7003_do_cmd(state, CMD_READ_PASSIVE);
+ if (ret) {
+ mutex_unlock(&state->lock);
+ return ret;
+ }
+
+ *val = pms7003_get_pm(frame->data + chan->address);
+ mutex_unlock(&state->lock);
+
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static const struct iio_info pms7003_info = {
+ .read_raw = pms7003_read_raw,
+};
+
+#define PMS7003_CHAN(_index, _mod, _addr) { \
+ .type = IIO_MASSCONCENTRATION, \
+ .modified = 1, \
+ .channel2 = IIO_MOD_ ## _mod, \
+ .address = _addr, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
+ .scan_index = _index, \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = 10, \
+ .storagebits = 16, \
+ .endianness = IIO_CPU, \
+ }, \
+}
+
+static const struct iio_chan_spec pms7003_channels[] = {
+ PMS7003_CHAN(0, PM1, PMS7003_PM1_OFFSET),
+ PMS7003_CHAN(1, PM2P5, PMS7003_PM2P5_OFFSET),
+ PMS7003_CHAN(2, PM10, PMS7003_PM10_OFFSET),
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+static u16 pms7003_calc_checksum(struct pms7003_frame *frame)
+{
+ u16 checksum = (PMS7003_MAGIC >> 8) + (u8)(PMS7003_MAGIC & 0xff) +
+ (frame->length >> 8) + (u8)frame->length;
+ int i;
+
+ for (i = 0; i < frame->length - PMS7003_CHECKSUM_LENGTH; i++)
+ checksum += frame->data[i];
+
+ return checksum;
+}
+
+static bool pms7003_frame_is_okay(struct pms7003_frame *frame)
+{
+ int offset = frame->length - PMS7003_CHECKSUM_LENGTH;
+ u16 checksum = get_unaligned_be16(frame->data + offset);
+
+ return checksum == pms7003_calc_checksum(frame);
+}
+
+static int pms7003_receive_buf(struct serdev_device *serdev,
+ const unsigned char *buf, size_t size)
+{
+ struct iio_dev *indio_dev = serdev_device_get_drvdata(serdev);
+ struct pms7003_state *state = iio_priv(indio_dev);
+ struct pms7003_frame *frame = &state->frame;
+ int num;
+
+ if (!frame->expected_length) {
+ u16 magic;
+
+ /* wait for SOF and data length */
+ if (size < 4)
+ return 0;
+
+ magic = get_unaligned_be16(buf);
+ if (magic != PMS7003_MAGIC)
+ return 2;
+
+ num = get_unaligned_be16(buf + 2);
+ if (num <= PMS7003_MAX_DATA_LENGTH) {
+ frame->expected_length = num;
+ frame->length = 0;
+ }
+
+ return 4;
+ }
+
+ num = min(size, (size_t)(frame->expected_length - frame->length));
+ memcpy(frame->data + frame->length, buf, num);
+ frame->length += num;
+
+ if (frame->length == frame->expected_length) {
+ if (pms7003_frame_is_okay(frame))
+ complete(&state->frame_ready);
+
+ frame->expected_length = 0;
+ }
+
+ return num;
+}
+
+static const struct serdev_device_ops pms7003_serdev_ops = {
+ .receive_buf = pms7003_receive_buf,
+ .write_wakeup = serdev_device_write_wakeup,
+};
+
+static void pms7003_stop(void *data)
+{
+ struct pms7003_state *state = data;
+
+ pms7003_do_cmd(state, CMD_SLEEP);
+}
+
+static const unsigned long pms7003_scan_masks[] = { 0x07, 0x00 };
+
+static int pms7003_probe(struct serdev_device *serdev)
+{
+ struct pms7003_state *state;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&serdev->dev, sizeof(*state));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ state = iio_priv(indio_dev);
+ serdev_device_set_drvdata(serdev, indio_dev);
+ state->serdev = serdev;
+ indio_dev->info = &pms7003_info;
+ indio_dev->name = PMS7003_DRIVER_NAME;
+ indio_dev->channels = pms7003_channels,
+ indio_dev->num_channels = ARRAY_SIZE(pms7003_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->available_scan_masks = pms7003_scan_masks;
+
+ mutex_init(&state->lock);
+ init_completion(&state->frame_ready);
+
+ serdev_device_set_client_ops(serdev, &pms7003_serdev_ops);
+ ret = devm_serdev_device_open(&serdev->dev, serdev);
+ if (ret)
+ return ret;
+
+ serdev_device_set_baudrate(serdev, 9600);
+ serdev_device_set_flow_control(serdev, false);
+
+ ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE);
+ if (ret)
+ return ret;
+
+ ret = pms7003_do_cmd(state, CMD_WAKEUP);
+ if (ret) {
+ dev_err(&serdev->dev, "failed to wakeup sensor\n");
+ return ret;
+ }
+
+ ret = pms7003_do_cmd(state, CMD_ENTER_PASSIVE_MODE);
+ if (ret) {
+ dev_err(&serdev->dev, "failed to enter passive mode\n");
+ return ret;
+ }
+
+ ret = devm_add_action_or_reset(&serdev->dev, pms7003_stop, state);
+ if (ret)
+ return ret;
+
+ ret = devm_iio_triggered_buffer_setup(&serdev->dev, indio_dev, NULL,
+ pms7003_trigger_handler, NULL);
+ if (ret)
+ return ret;
+
+ return devm_iio_device_register(&serdev->dev, indio_dev);
+}
+
+static const struct of_device_id pms7003_of_match[] = {
+ { .compatible = "plantower,pms1003" },
+ { .compatible = "plantower,pms3003" },
+ { .compatible = "plantower,pms5003" },
+ { .compatible = "plantower,pms6003" },
+ { .compatible = "plantower,pms7003" },
+ { .compatible = "plantower,pmsa003" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, pms7003_of_match);
+
+static struct serdev_device_driver pms7003_driver = {
+ .driver = {
+ .name = PMS7003_DRIVER_NAME,
+ .of_match_table = pms7003_of_match,
+ },
+ .probe = pms7003_probe,
+};
+module_serdev_device_driver(pms7003_driver);
+
+MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
+MODULE_DESCRIPTION("Plantower PMS7003 particulate matter sensor driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/scd30.h b/drivers/iio/chemical/scd30.h
new file mode 100644
index 000000000..f60127bfe
--- /dev/null
+++ b/drivers/iio/chemical/scd30.h
@@ -0,0 +1,78 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _SCD30_H
+#define _SCD30_H
+
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/pm.h>
+#include <linux/regulator/consumer.h>
+#include <linux/types.h>
+
+struct scd30_state;
+
+enum scd30_cmd {
+ /* start continuous measurement with pressure compensation */
+ CMD_START_MEAS,
+ /* stop continuous measurement */
+ CMD_STOP_MEAS,
+ /* set/get measurement interval */
+ CMD_MEAS_INTERVAL,
+ /* check whether new measurement is ready */
+ CMD_MEAS_READY,
+ /* get measurement */
+ CMD_READ_MEAS,
+ /* turn on/off automatic self calibration */
+ CMD_ASC,
+ /* set/get forced recalibration value */
+ CMD_FRC,
+ /* set/get temperature offset */
+ CMD_TEMP_OFFSET,
+ /* get firmware version */
+ CMD_FW_VERSION,
+ /* reset sensor */
+ CMD_RESET,
+ /*
+ * Command for altitude compensation was omitted intentionally because
+ * the same can be achieved by means of CMD_START_MEAS which takes
+ * pressure above the sea level as an argument.
+ */
+};
+
+#define SCD30_MEAS_COUNT 3
+
+typedef int (*scd30_command_t)(struct scd30_state *state, enum scd30_cmd cmd, u16 arg,
+ void *response, int size);
+
+struct scd30_state {
+ /* serialize access to the device */
+ struct mutex lock;
+ struct device *dev;
+ struct regulator *vdd;
+ struct completion meas_ready;
+ /*
+ * priv pointer is solely for serdev driver private data. We keep it
+ * here because driver_data inside dev has been already used for iio and
+ * struct serdev_device doesn't have one.
+ */
+ void *priv;
+ int irq;
+ /*
+ * no way to retrieve current ambient pressure compensation value from
+ * the sensor so keep one around
+ */
+ u16 pressure_comp;
+ u16 meas_interval;
+ int meas[SCD30_MEAS_COUNT];
+
+ scd30_command_t command;
+};
+
+int scd30_suspend(struct device *dev);
+int scd30_resume(struct device *dev);
+
+static __maybe_unused SIMPLE_DEV_PM_OPS(scd30_pm_ops, scd30_suspend, scd30_resume);
+
+int scd30_probe(struct device *dev, int irq, const char *name, void *priv, scd30_command_t command);
+
+#endif
diff --git a/drivers/iio/chemical/scd30_core.c b/drivers/iio/chemical/scd30_core.c
new file mode 100644
index 000000000..4d0d798c7
--- /dev/null
+++ b/drivers/iio/chemical/scd30_core.c
@@ -0,0 +1,766 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sensirion SCD30 carbon dioxide sensor core driver
+ *
+ * Copyright (c) 2020 Tomasz Duszynski <tomasz.duszynski@octakon.com>
+ */
+#include <linux/bits.h>
+#include <linux/completion.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/types.h>
+#include <linux/interrupt.h>
+#include <linux/irqreturn.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regulator/consumer.h>
+#include <linux/string.h>
+#include <linux/sysfs.h>
+#include <linux/types.h>
+#include <asm/byteorder.h>
+
+#include "scd30.h"
+
+#define SCD30_PRESSURE_COMP_MIN_MBAR 700
+#define SCD30_PRESSURE_COMP_MAX_MBAR 1400
+#define SCD30_PRESSURE_COMP_DEFAULT 1013
+#define SCD30_MEAS_INTERVAL_MIN_S 2
+#define SCD30_MEAS_INTERVAL_MAX_S 1800
+#define SCD30_MEAS_INTERVAL_DEFAULT SCD30_MEAS_INTERVAL_MIN_S
+#define SCD30_FRC_MIN_PPM 400
+#define SCD30_FRC_MAX_PPM 2000
+#define SCD30_TEMP_OFFSET_MAX 655360
+#define SCD30_EXTRA_TIMEOUT_PER_S 250
+
+enum {
+ SCD30_CONC,
+ SCD30_TEMP,
+ SCD30_HR,
+};
+
+static int scd30_command_write(struct scd30_state *state, enum scd30_cmd cmd, u16 arg)
+{
+ return state->command(state, cmd, arg, NULL, 0);
+}
+
+static int scd30_command_read(struct scd30_state *state, enum scd30_cmd cmd, u16 *val)
+{
+ __be16 tmp;
+ int ret;
+
+ ret = state->command(state, cmd, 0, &tmp, sizeof(tmp));
+ *val = be16_to_cpup(&tmp);
+
+ return ret;
+}
+
+static int scd30_reset(struct scd30_state *state)
+{
+ int ret;
+ u16 val;
+
+ ret = scd30_command_write(state, CMD_RESET, 0);
+ if (ret)
+ return ret;
+
+ /* sensor boots up within 2 secs */
+ msleep(2000);
+ /*
+ * Power-on-reset causes sensor to produce some glitch on i2c bus and
+ * some controllers end up in error state. Try to recover by placing
+ * any data on the bus.
+ */
+ scd30_command_read(state, CMD_MEAS_READY, &val);
+
+ return 0;
+}
+
+/* simplified float to fixed point conversion with a scaling factor of 0.01 */
+static int scd30_float_to_fp(int float32)
+{
+ int fraction, shift,
+ mantissa = float32 & GENMASK(22, 0),
+ sign = (float32 & BIT(31)) ? -1 : 1,
+ exp = (float32 & ~BIT(31)) >> 23;
+
+ /* special case 0 */
+ if (!exp && !mantissa)
+ return 0;
+
+ exp -= 127;
+ if (exp < 0) {
+ exp = -exp;
+ /* return values ranging from 1 to 99 */
+ return sign * ((((BIT(23) + mantissa) * 100) >> 23) >> exp);
+ }
+
+ /* return values starting at 100 */
+ shift = 23 - exp;
+ float32 = BIT(exp) + (mantissa >> shift);
+ fraction = mantissa & GENMASK(shift - 1, 0);
+
+ return sign * (float32 * 100 + ((fraction * 100) >> shift));
+}
+
+static int scd30_read_meas(struct scd30_state *state)
+{
+ int i, ret;
+
+ ret = state->command(state, CMD_READ_MEAS, 0, state->meas, sizeof(state->meas));
+ if (ret)
+ return ret;
+
+ be32_to_cpu_array(state->meas, (__be32 *)state->meas, ARRAY_SIZE(state->meas));
+
+ for (i = 0; i < ARRAY_SIZE(state->meas); i++)
+ state->meas[i] = scd30_float_to_fp(state->meas[i]);
+
+ /*
+ * co2 is left unprocessed while temperature and humidity are scaled
+ * to milli deg C and milli percent respectively.
+ */
+ state->meas[SCD30_TEMP] *= 10;
+ state->meas[SCD30_HR] *= 10;
+
+ return 0;
+}
+
+static int scd30_wait_meas_irq(struct scd30_state *state)
+{
+ int ret, timeout;
+
+ reinit_completion(&state->meas_ready);
+ enable_irq(state->irq);
+ timeout = msecs_to_jiffies(state->meas_interval * (1000 + SCD30_EXTRA_TIMEOUT_PER_S));
+ ret = wait_for_completion_interruptible_timeout(&state->meas_ready, timeout);
+ if (ret > 0)
+ ret = 0;
+ else if (!ret)
+ ret = -ETIMEDOUT;
+
+ disable_irq(state->irq);
+
+ return ret;
+}
+
+static int scd30_wait_meas_poll(struct scd30_state *state)
+{
+ int timeout = state->meas_interval * SCD30_EXTRA_TIMEOUT_PER_S, tries = 5;
+
+ do {
+ int ret;
+ u16 val;
+
+ ret = scd30_command_read(state, CMD_MEAS_READY, &val);
+ if (ret)
+ return -EIO;
+
+ /* new measurement available */
+ if (val)
+ break;
+
+ msleep_interruptible(timeout);
+ } while (--tries);
+
+ return tries ? 0 : -ETIMEDOUT;
+}
+
+static int scd30_read_poll(struct scd30_state *state)
+{
+ int ret;
+
+ ret = scd30_wait_meas_poll(state);
+ if (ret)
+ return ret;
+
+ return scd30_read_meas(state);
+}
+
+static int scd30_read(struct scd30_state *state)
+{
+ if (state->irq > 0)
+ return scd30_wait_meas_irq(state);
+
+ return scd30_read_poll(state);
+}
+
+static int scd30_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct scd30_state *state = iio_priv(indio_dev);
+ int ret = -EINVAL;
+ u16 tmp;
+
+ mutex_lock(&state->lock);
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ case IIO_CHAN_INFO_PROCESSED:
+ if (chan->output) {
+ *val = state->pressure_comp;
+ ret = IIO_VAL_INT;
+ break;
+ }
+
+ ret = iio_device_claim_direct_mode(indio_dev);
+ if (ret)
+ break;
+
+ ret = scd30_read(state);
+ if (ret) {
+ iio_device_release_direct_mode(indio_dev);
+ break;
+ }
+
+ *val = state->meas[chan->address];
+ iio_device_release_direct_mode(indio_dev);
+ ret = IIO_VAL_INT;
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ *val = 0;
+ *val2 = 1;
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = scd30_command_read(state, CMD_MEAS_INTERVAL, &tmp);
+ if (ret)
+ break;
+
+ *val = 0;
+ *val2 = 1000000000 / tmp;
+ ret = IIO_VAL_INT_PLUS_NANO;
+ break;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ ret = scd30_command_read(state, CMD_TEMP_OFFSET, &tmp);
+ if (ret)
+ break;
+
+ *val = tmp;
+ ret = IIO_VAL_INT;
+ break;
+ }
+ mutex_unlock(&state->lock);
+
+ return ret;
+}
+
+static int scd30_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct scd30_state *state = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ mutex_lock(&state->lock);
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ if (val)
+ break;
+
+ val = 1000000000 / val2;
+ if (val < SCD30_MEAS_INTERVAL_MIN_S || val > SCD30_MEAS_INTERVAL_MAX_S)
+ break;
+
+ ret = scd30_command_write(state, CMD_MEAS_INTERVAL, val);
+ if (ret)
+ break;
+
+ state->meas_interval = val;
+ break;
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->type) {
+ case IIO_PRESSURE:
+ if (val < SCD30_PRESSURE_COMP_MIN_MBAR ||
+ val > SCD30_PRESSURE_COMP_MAX_MBAR)
+ break;
+
+ ret = scd30_command_write(state, CMD_START_MEAS, val);
+ if (ret)
+ break;
+
+ state->pressure_comp = val;
+ break;
+ default:
+ break;
+ }
+ break;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ if (val < 0 || val > SCD30_TEMP_OFFSET_MAX)
+ break;
+ /*
+ * Manufacturer does not explicitly specify min/max sensible
+ * values hence check is omitted for simplicity.
+ */
+ ret = scd30_command_write(state, CMD_TEMP_OFFSET / 10, val);
+ }
+ mutex_unlock(&state->lock);
+
+ return ret;
+}
+
+static int scd30_write_raw_get_fmt(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
+ long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return IIO_VAL_INT_PLUS_NANO;
+ case IIO_CHAN_INFO_RAW:
+ case IIO_CHAN_INFO_CALIBBIAS:
+ return IIO_VAL_INT;
+ }
+
+ return -EINVAL;
+}
+
+static const int scd30_pressure_raw_available[] = {
+ SCD30_PRESSURE_COMP_MIN_MBAR, 1, SCD30_PRESSURE_COMP_MAX_MBAR,
+};
+
+static const int scd30_temp_calibbias_available[] = {
+ 0, 10, SCD30_TEMP_OFFSET_MAX,
+};
+
+static int scd30_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length, long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ *vals = scd30_pressure_raw_available;
+ *type = IIO_VAL_INT;
+
+ return IIO_AVAIL_RANGE;
+ case IIO_CHAN_INFO_CALIBBIAS:
+ *vals = scd30_temp_calibbias_available;
+ *type = IIO_VAL_INT;
+
+ return IIO_AVAIL_RANGE;
+ }
+
+ return -EINVAL;
+}
+
+static ssize_t sampling_frequency_available_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int i = SCD30_MEAS_INTERVAL_MIN_S;
+ ssize_t len = 0;
+
+ do {
+ len += scnprintf(buf + len, PAGE_SIZE - len, "0.%09u ", 1000000000 / i);
+ /*
+ * Not all values fit PAGE_SIZE buffer hence print every 6th
+ * (each frequency differs by 6s in time domain from the
+ * adjacent). Unlisted but valid ones are still accepted.
+ */
+ i += 6;
+ } while (i <= SCD30_MEAS_INTERVAL_MAX_S);
+
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static ssize_t calibration_auto_enable_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct scd30_state *state = iio_priv(indio_dev);
+ int ret;
+ u16 val;
+
+ mutex_lock(&state->lock);
+ ret = scd30_command_read(state, CMD_ASC, &val);
+ mutex_unlock(&state->lock);
+
+ return ret ?: sprintf(buf, "%d\n", val);
+}
+
+static ssize_t calibration_auto_enable_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct scd30_state *state = iio_priv(indio_dev);
+ bool val;
+ int ret;
+
+ ret = kstrtobool(buf, &val);
+ if (ret)
+ return ret;
+
+ mutex_lock(&state->lock);
+ ret = scd30_command_write(state, CMD_ASC, val);
+ mutex_unlock(&state->lock);
+
+ return ret ?: len;
+}
+
+static ssize_t calibration_forced_value_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct scd30_state *state = iio_priv(indio_dev);
+ int ret;
+ u16 val;
+
+ mutex_lock(&state->lock);
+ ret = scd30_command_read(state, CMD_FRC, &val);
+ mutex_unlock(&state->lock);
+
+ return ret ?: sprintf(buf, "%d\n", val);
+}
+
+static ssize_t calibration_forced_value_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct scd30_state *state = iio_priv(indio_dev);
+ int ret;
+ u16 val;
+
+ ret = kstrtou16(buf, 0, &val);
+ if (ret)
+ return ret;
+
+ if (val < SCD30_FRC_MIN_PPM || val > SCD30_FRC_MAX_PPM)
+ return -EINVAL;
+
+ mutex_lock(&state->lock);
+ ret = scd30_command_write(state, CMD_FRC, val);
+ mutex_unlock(&state->lock);
+
+ return ret ?: len;
+}
+
+static IIO_DEVICE_ATTR_RO(sampling_frequency_available, 0);
+static IIO_DEVICE_ATTR_RW(calibration_auto_enable, 0);
+static IIO_DEVICE_ATTR_RW(calibration_forced_value, 0);
+
+static struct attribute *scd30_attrs[] = {
+ &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_dev_attr_calibration_auto_enable.dev_attr.attr,
+ &iio_dev_attr_calibration_forced_value.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group scd30_attr_group = {
+ .attrs = scd30_attrs,
+};
+
+static const struct iio_info scd30_info = {
+ .attrs = &scd30_attr_group,
+ .read_raw = scd30_read_raw,
+ .write_raw = scd30_write_raw,
+ .write_raw_get_fmt = scd30_write_raw_get_fmt,
+ .read_avail = scd30_read_avail,
+};
+
+#define SCD30_CHAN_SCAN_TYPE(_sign, _realbits) .scan_type = { \
+ .sign = _sign, \
+ .realbits = _realbits, \
+ .storagebits = 32, \
+ .endianness = IIO_CPU, \
+}
+
+static const struct iio_chan_spec scd30_channels[] = {
+ {
+ /*
+ * this channel is special in a sense we are pretending that
+ * sensor is able to change measurement chamber pressure but in
+ * fact we're just setting pressure compensation value
+ */
+ .type = IIO_PRESSURE,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW),
+ .output = 1,
+ .scan_index = -1,
+ },
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_CO2,
+ .address = SCD30_CONC,
+ .scan_index = SCD30_CONC,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .modified = 1,
+
+ SCD30_CHAN_SCAN_TYPE('u', 20),
+ },
+ {
+ .type = IIO_TEMP,
+ .address = SCD30_TEMP,
+ .scan_index = SCD30_TEMP,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
+ BIT(IIO_CHAN_INFO_CALIBBIAS),
+ .info_mask_separate_available = BIT(IIO_CHAN_INFO_CALIBBIAS),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+
+ SCD30_CHAN_SCAN_TYPE('s', 18),
+ },
+ {
+ .type = IIO_HUMIDITYRELATIVE,
+ .address = SCD30_HR,
+ .scan_index = SCD30_HR,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+
+ SCD30_CHAN_SCAN_TYPE('u', 17),
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+int __maybe_unused scd30_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct scd30_state *state = iio_priv(indio_dev);
+ int ret;
+
+ ret = scd30_command_write(state, CMD_STOP_MEAS, 0);
+ if (ret)
+ return ret;
+
+ return regulator_disable(state->vdd);
+}
+EXPORT_SYMBOL(scd30_suspend);
+
+int __maybe_unused scd30_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(dev);
+ struct scd30_state *state = iio_priv(indio_dev);
+ int ret;
+
+ ret = regulator_enable(state->vdd);
+ if (ret)
+ return ret;
+
+ return scd30_command_write(state, CMD_START_MEAS, state->pressure_comp);
+}
+EXPORT_SYMBOL(scd30_resume);
+
+static void scd30_stop_meas(void *data)
+{
+ struct scd30_state *state = data;
+
+ scd30_command_write(state, CMD_STOP_MEAS, 0);
+}
+
+static void scd30_disable_regulator(void *data)
+{
+ struct scd30_state *state = data;
+
+ regulator_disable(state->vdd);
+}
+
+static irqreturn_t scd30_irq_handler(int irq, void *priv)
+{
+ struct iio_dev *indio_dev = priv;
+
+ if (iio_buffer_enabled(indio_dev)) {
+ iio_trigger_poll(indio_dev->trig);
+
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t scd30_irq_thread_handler(int irq, void *priv)
+{
+ struct iio_dev *indio_dev = priv;
+ struct scd30_state *state = iio_priv(indio_dev);
+ int ret;
+
+ ret = scd30_read_meas(state);
+ if (ret)
+ goto out;
+
+ complete_all(&state->meas_ready);
+out:
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t scd30_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct scd30_state *state = iio_priv(indio_dev);
+ struct {
+ int data[SCD30_MEAS_COUNT];
+ s64 ts __aligned(8);
+ } scan;
+ int ret;
+
+ mutex_lock(&state->lock);
+ if (!iio_trigger_using_own(indio_dev))
+ ret = scd30_read_poll(state);
+ else
+ ret = scd30_read_meas(state);
+ memset(&scan, 0, sizeof(scan));
+ memcpy(scan.data, state->meas, sizeof(state->meas));
+ mutex_unlock(&state->lock);
+ if (ret)
+ goto out;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &scan, iio_get_time_ns(indio_dev));
+out:
+ iio_trigger_notify_done(indio_dev->trig);
+ return IRQ_HANDLED;
+}
+
+static int scd30_set_trigger_state(struct iio_trigger *trig, bool state)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+ struct scd30_state *st = iio_priv(indio_dev);
+
+ if (state)
+ enable_irq(st->irq);
+ else
+ disable_irq(st->irq);
+
+ return 0;
+}
+
+static const struct iio_trigger_ops scd30_trigger_ops = {
+ .set_trigger_state = scd30_set_trigger_state,
+ .validate_device = iio_trigger_validate_own_device,
+};
+
+static int scd30_setup_trigger(struct iio_dev *indio_dev)
+{
+ struct scd30_state *state = iio_priv(indio_dev);
+ struct device *dev = indio_dev->dev.parent;
+ struct iio_trigger *trig;
+ int ret;
+
+ trig = devm_iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name, indio_dev->id);
+ if (!trig) {
+ dev_err(dev, "failed to allocate trigger\n");
+ return -ENOMEM;
+ }
+
+ trig->dev.parent = dev;
+ trig->ops = &scd30_trigger_ops;
+ iio_trigger_set_drvdata(trig, indio_dev);
+
+ ret = devm_iio_trigger_register(dev, trig);
+ if (ret)
+ return ret;
+
+ indio_dev->trig = iio_trigger_get(trig);
+
+ ret = devm_request_threaded_irq(dev, state->irq, scd30_irq_handler,
+ scd30_irq_thread_handler, IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+ indio_dev->name, indio_dev);
+ if (ret)
+ dev_err(dev, "failed to request irq\n");
+
+ /*
+ * Interrupt is enabled just before taking a fresh measurement
+ * and disabled afterwards. This means we need to disable it here
+ * to keep calls to enable/disable balanced.
+ */
+ disable_irq(state->irq);
+
+ return ret;
+}
+
+int scd30_probe(struct device *dev, int irq, const char *name, void *priv,
+ scd30_command_t command)
+{
+ static const unsigned long scd30_scan_masks[] = { 0x07, 0x00 };
+ struct scd30_state *state;
+ struct iio_dev *indio_dev;
+ int ret;
+ u16 val;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ state = iio_priv(indio_dev);
+ state->dev = dev;
+ state->priv = priv;
+ state->irq = irq;
+ state->pressure_comp = SCD30_PRESSURE_COMP_DEFAULT;
+ state->meas_interval = SCD30_MEAS_INTERVAL_DEFAULT;
+ state->command = command;
+ mutex_init(&state->lock);
+ init_completion(&state->meas_ready);
+
+ dev_set_drvdata(dev, indio_dev);
+
+ indio_dev->info = &scd30_info;
+ indio_dev->name = name;
+ indio_dev->channels = scd30_channels;
+ indio_dev->num_channels = ARRAY_SIZE(scd30_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->available_scan_masks = scd30_scan_masks;
+
+ state->vdd = devm_regulator_get(dev, "vdd");
+ if (IS_ERR(state->vdd))
+ return dev_err_probe(dev, PTR_ERR(state->vdd), "failed to get regulator\n");
+
+ ret = regulator_enable(state->vdd);
+ if (ret)
+ return ret;
+
+ ret = devm_add_action_or_reset(dev, scd30_disable_regulator, state);
+ if (ret)
+ return ret;
+
+ ret = scd30_reset(state);
+ if (ret) {
+ dev_err(dev, "failed to reset device: %d\n", ret);
+ return ret;
+ }
+
+ if (state->irq > 0) {
+ ret = scd30_setup_trigger(indio_dev);
+ if (ret) {
+ dev_err(dev, "failed to setup trigger: %d\n", ret);
+ return ret;
+ }
+ }
+
+ ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, scd30_trigger_handler, NULL);
+ if (ret)
+ return ret;
+
+ ret = scd30_command_read(state, CMD_FW_VERSION, &val);
+ if (ret) {
+ dev_err(dev, "failed to read firmware version: %d\n", ret);
+ return ret;
+ }
+ dev_info(dev, "firmware version: %d.%d\n", val >> 8, (char)val);
+
+ ret = scd30_command_write(state, CMD_MEAS_INTERVAL, state->meas_interval);
+ if (ret) {
+ dev_err(dev, "failed to set measurement interval: %d\n", ret);
+ return ret;
+ }
+
+ ret = scd30_command_write(state, CMD_START_MEAS, state->pressure_comp);
+ if (ret) {
+ dev_err(dev, "failed to start measurement: %d\n", ret);
+ return ret;
+ }
+
+ ret = devm_add_action_or_reset(dev, scd30_stop_meas, state);
+ if (ret)
+ return ret;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+EXPORT_SYMBOL(scd30_probe);
+
+MODULE_AUTHOR("Tomasz Duszynski <tomasz.duszynski@octakon.com>");
+MODULE_DESCRIPTION("Sensirion SCD30 carbon dioxide sensor core driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/scd30_i2c.c b/drivers/iio/chemical/scd30_i2c.c
new file mode 100644
index 000000000..875892a07
--- /dev/null
+++ b/drivers/iio/chemical/scd30_i2c.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sensirion SCD30 carbon dioxide sensor i2c driver
+ *
+ * Copyright (c) 2020 Tomasz Duszynski <tomasz.duszynski@octakon.com>
+ *
+ * I2C slave address: 0x61
+ */
+#include <linux/crc8.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <asm/unaligned.h>
+
+#include "scd30.h"
+
+#define SCD30_I2C_MAX_BUF_SIZE 18
+#define SCD30_I2C_CRC8_POLYNOMIAL 0x31
+
+static u16 scd30_i2c_cmd_lookup_tbl[] = {
+ [CMD_START_MEAS] = 0x0010,
+ [CMD_STOP_MEAS] = 0x0104,
+ [CMD_MEAS_INTERVAL] = 0x4600,
+ [CMD_MEAS_READY] = 0x0202,
+ [CMD_READ_MEAS] = 0x0300,
+ [CMD_ASC] = 0x5306,
+ [CMD_FRC] = 0x5204,
+ [CMD_TEMP_OFFSET] = 0x5403,
+ [CMD_FW_VERSION] = 0xd100,
+ [CMD_RESET] = 0xd304,
+};
+
+DECLARE_CRC8_TABLE(scd30_i2c_crc8_tbl);
+
+static int scd30_i2c_xfer(struct scd30_state *state, char *txbuf, int txsize,
+ char *rxbuf, int rxsize)
+{
+ struct i2c_client *client = to_i2c_client(state->dev);
+ int ret;
+
+ /*
+ * repeated start is not supported hence instead of sending two i2c
+ * messages in a row we send one by one
+ */
+ ret = i2c_master_send(client, txbuf, txsize);
+ if (ret < 0)
+ return ret;
+ if (ret != txsize)
+ return -EIO;
+
+ if (!rxbuf)
+ return 0;
+
+ ret = i2c_master_recv(client, rxbuf, rxsize);
+ if (ret < 0)
+ return ret;
+ if (ret != rxsize)
+ return -EIO;
+
+ return 0;
+}
+
+static int scd30_i2c_command(struct scd30_state *state, enum scd30_cmd cmd, u16 arg,
+ void *response, int size)
+{
+ char buf[SCD30_I2C_MAX_BUF_SIZE];
+ char *rsp = response;
+ int i, ret;
+ char crc;
+
+ put_unaligned_be16(scd30_i2c_cmd_lookup_tbl[cmd], buf);
+ i = 2;
+
+ if (rsp) {
+ /* each two bytes are followed by a crc8 */
+ size += size / 2;
+ } else {
+ put_unaligned_be16(arg, buf + i);
+ crc = crc8(scd30_i2c_crc8_tbl, buf + i, 2, CRC8_INIT_VALUE);
+ i += 2;
+ buf[i] = crc;
+ i += 1;
+
+ /* commands below don't take an argument */
+ if ((cmd == CMD_STOP_MEAS) || (cmd == CMD_RESET))
+ i -= 3;
+ }
+
+ ret = scd30_i2c_xfer(state, buf, i, buf, size);
+ if (ret)
+ return ret;
+
+ /* validate received data and strip off crc bytes */
+ for (i = 0; i < size; i += 3) {
+ crc = crc8(scd30_i2c_crc8_tbl, buf + i, 2, CRC8_INIT_VALUE);
+ if (crc != buf[i + 2]) {
+ dev_err(state->dev, "data integrity check failed\n");
+ return -EIO;
+ }
+
+ *rsp++ = buf[i];
+ *rsp++ = buf[i + 1];
+ }
+
+ return 0;
+}
+
+static int scd30_i2c_probe(struct i2c_client *client)
+{
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -EOPNOTSUPP;
+
+ crc8_populate_msb(scd30_i2c_crc8_tbl, SCD30_I2C_CRC8_POLYNOMIAL);
+
+ return scd30_probe(&client->dev, client->irq, client->name, NULL, scd30_i2c_command);
+}
+
+static const struct of_device_id scd30_i2c_of_match[] = {
+ { .compatible = "sensirion,scd30" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, scd30_i2c_of_match);
+
+static struct i2c_driver scd30_i2c_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = scd30_i2c_of_match,
+ .pm = &scd30_pm_ops,
+ },
+ .probe_new = scd30_i2c_probe,
+};
+module_i2c_driver(scd30_i2c_driver);
+
+MODULE_AUTHOR("Tomasz Duszynski <tomasz.duszynski@octakon.com>");
+MODULE_DESCRIPTION("Sensirion SCD30 carbon dioxide sensor i2c driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/scd30_serial.c b/drivers/iio/chemical/scd30_serial.c
new file mode 100644
index 000000000..06f85eb1a
--- /dev/null
+++ b/drivers/iio/chemical/scd30_serial.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sensirion SCD30 carbon dioxide sensor serial driver
+ *
+ * Copyright (c) 2020 Tomasz Duszynski <tomasz.duszynski@octakon.com>
+ */
+#include <linux/crc16.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/iio/iio.h>
+#include <linux/jiffies.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/serdev.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <asm/unaligned.h>
+
+#include "scd30.h"
+
+#define SCD30_SERDEV_ADDR 0x61
+#define SCD30_SERDEV_WRITE 0x06
+#define SCD30_SERDEV_READ 0x03
+#define SCD30_SERDEV_MAX_BUF_SIZE 17
+#define SCD30_SERDEV_RX_HEADER_SIZE 3
+#define SCD30_SERDEV_CRC_SIZE 2
+#define SCD30_SERDEV_TIMEOUT msecs_to_jiffies(200)
+
+struct scd30_serdev_priv {
+ struct completion meas_ready;
+ char *buf;
+ int num_expected;
+ int num;
+};
+
+static u16 scd30_serdev_cmd_lookup_tbl[] = {
+ [CMD_START_MEAS] = 0x0036,
+ [CMD_STOP_MEAS] = 0x0037,
+ [CMD_MEAS_INTERVAL] = 0x0025,
+ [CMD_MEAS_READY] = 0x0027,
+ [CMD_READ_MEAS] = 0x0028,
+ [CMD_ASC] = 0x003a,
+ [CMD_FRC] = 0x0039,
+ [CMD_TEMP_OFFSET] = 0x003b,
+ [CMD_FW_VERSION] = 0x0020,
+ [CMD_RESET] = 0x0034,
+};
+
+static u16 scd30_serdev_calc_crc(const char *buf, int size)
+{
+ return crc16(0xffff, buf, size);
+}
+
+static int scd30_serdev_xfer(struct scd30_state *state, char *txbuf, int txsize,
+ char *rxbuf, int rxsize)
+{
+ struct serdev_device *serdev = to_serdev_device(state->dev);
+ struct scd30_serdev_priv *priv = state->priv;
+ int ret;
+
+ priv->buf = rxbuf;
+ priv->num_expected = rxsize;
+ priv->num = 0;
+
+ ret = serdev_device_write(serdev, txbuf, txsize, SCD30_SERDEV_TIMEOUT);
+ if (ret < 0)
+ return ret;
+ if (ret != txsize)
+ return -EIO;
+
+ ret = wait_for_completion_interruptible_timeout(&priv->meas_ready, SCD30_SERDEV_TIMEOUT);
+ if (ret < 0)
+ return ret;
+ if (!ret)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+static int scd30_serdev_command(struct scd30_state *state, enum scd30_cmd cmd, u16 arg,
+ void *response, int size)
+{
+ /*
+ * Communication over serial line is based on modbus protocol (or rather
+ * its variation called modbus over serial to be precise). Upon
+ * receiving a request device should reply with response.
+ *
+ * Frame below represents a request message. Each field takes
+ * exactly one byte.
+ *
+ * +------+------+-----+-----+-------+-------+-----+-----+
+ * | dev | op | reg | reg | byte1 | byte0 | crc | crc |
+ * | addr | code | msb | lsb | | | lsb | msb |
+ * +------+------+-----+-----+-------+-------+-----+-----+
+ *
+ * The message device replies with depends on the 'op code' field from
+ * the request. In case it was set to SCD30_SERDEV_WRITE sensor should
+ * reply with unchanged request. Otherwise 'op code' was set to
+ * SCD30_SERDEV_READ and response looks like the one below. As with
+ * request, each field takes one byte.
+ *
+ * +------+------+--------+-------+-----+-------+-----+-----+
+ * | dev | op | num of | byte0 | ... | byteN | crc | crc |
+ * | addr | code | bytes | | | | lsb | msb |
+ * +------+------+--------+-------+-----+-------+-----+-----+
+ */
+ char txbuf[SCD30_SERDEV_MAX_BUF_SIZE] = { SCD30_SERDEV_ADDR },
+ rxbuf[SCD30_SERDEV_MAX_BUF_SIZE];
+ int ret, rxsize, txsize = 2;
+ char *rsp = response;
+ u16 crc;
+
+ put_unaligned_be16(scd30_serdev_cmd_lookup_tbl[cmd], txbuf + txsize);
+ txsize += 2;
+
+ if (rsp) {
+ txbuf[1] = SCD30_SERDEV_READ;
+ if (cmd == CMD_READ_MEAS)
+ /* number of u16 words to read */
+ put_unaligned_be16(size / 2, txbuf + txsize);
+ else
+ put_unaligned_be16(0x0001, txbuf + txsize);
+ txsize += 2;
+ crc = scd30_serdev_calc_crc(txbuf, txsize);
+ put_unaligned_le16(crc, txbuf + txsize);
+ txsize += 2;
+ rxsize = SCD30_SERDEV_RX_HEADER_SIZE + size + SCD30_SERDEV_CRC_SIZE;
+ } else {
+ if ((cmd == CMD_STOP_MEAS) || (cmd == CMD_RESET))
+ arg = 0x0001;
+
+ txbuf[1] = SCD30_SERDEV_WRITE;
+ put_unaligned_be16(arg, txbuf + txsize);
+ txsize += 2;
+ crc = scd30_serdev_calc_crc(txbuf, txsize);
+ put_unaligned_le16(crc, txbuf + txsize);
+ txsize += 2;
+ rxsize = txsize;
+ }
+
+ ret = scd30_serdev_xfer(state, txbuf, txsize, rxbuf, rxsize);
+ if (ret)
+ return ret;
+
+ switch (txbuf[1]) {
+ case SCD30_SERDEV_WRITE:
+ if (memcmp(txbuf, rxbuf, txsize)) {
+ dev_err(state->dev, "wrong message received\n");
+ return -EIO;
+ }
+ break;
+ case SCD30_SERDEV_READ:
+ if (rxbuf[2] != (rxsize - SCD30_SERDEV_RX_HEADER_SIZE - SCD30_SERDEV_CRC_SIZE)) {
+ dev_err(state->dev, "received data size does not match header\n");
+ return -EIO;
+ }
+
+ rxsize -= SCD30_SERDEV_CRC_SIZE;
+ crc = get_unaligned_le16(rxbuf + rxsize);
+ if (crc != scd30_serdev_calc_crc(rxbuf, rxsize)) {
+ dev_err(state->dev, "data integrity check failed\n");
+ return -EIO;
+ }
+
+ rxsize -= SCD30_SERDEV_RX_HEADER_SIZE;
+ memcpy(rsp, rxbuf + SCD30_SERDEV_RX_HEADER_SIZE, rxsize);
+ break;
+ default:
+ dev_err(state->dev, "received unknown op code\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+static int scd30_serdev_receive_buf(struct serdev_device *serdev,
+ const unsigned char *buf, size_t size)
+{
+ struct iio_dev *indio_dev = dev_get_drvdata(&serdev->dev);
+ struct scd30_serdev_priv *priv;
+ struct scd30_state *state;
+ int num;
+
+ if (!indio_dev)
+ return 0;
+
+ state = iio_priv(indio_dev);
+ priv = state->priv;
+
+ /* just in case sensor puts some unexpected bytes on the bus */
+ if (!priv->buf)
+ return 0;
+
+ if (priv->num + size >= priv->num_expected)
+ num = priv->num_expected - priv->num;
+ else
+ num = size;
+
+ memcpy(priv->buf + priv->num, buf, num);
+ priv->num += num;
+
+ if (priv->num == priv->num_expected) {
+ priv->buf = NULL;
+ complete(&priv->meas_ready);
+ }
+
+ return num;
+}
+
+static const struct serdev_device_ops scd30_serdev_ops = {
+ .receive_buf = scd30_serdev_receive_buf,
+ .write_wakeup = serdev_device_write_wakeup,
+};
+
+static int scd30_serdev_probe(struct serdev_device *serdev)
+{
+ struct device *dev = &serdev->dev;
+ struct scd30_serdev_priv *priv;
+ int irq, ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ init_completion(&priv->meas_ready);
+ serdev_device_set_client_ops(serdev, &scd30_serdev_ops);
+
+ ret = devm_serdev_device_open(dev, serdev);
+ if (ret)
+ return ret;
+
+ serdev_device_set_baudrate(serdev, 19200);
+ serdev_device_set_flow_control(serdev, false);
+
+ ret = serdev_device_set_parity(serdev, SERDEV_PARITY_NONE);
+ if (ret)
+ return ret;
+
+ irq = fwnode_irq_get(dev_fwnode(dev), 0);
+
+ return scd30_probe(dev, irq, KBUILD_MODNAME, priv, scd30_serdev_command);
+}
+
+static const struct of_device_id scd30_serdev_of_match[] = {
+ { .compatible = "sensirion,scd30" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, scd30_serdev_of_match);
+
+static struct serdev_device_driver scd30_serdev_driver = {
+ .driver = {
+ .name = KBUILD_MODNAME,
+ .of_match_table = scd30_serdev_of_match,
+ .pm = &scd30_pm_ops,
+ },
+ .probe = scd30_serdev_probe,
+};
+module_serdev_device_driver(scd30_serdev_driver);
+
+MODULE_AUTHOR("Tomasz Duszynski <tomasz.duszynski@octakon.com>");
+MODULE_DESCRIPTION("Sensirion SCD30 carbon dioxide sensor serial driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/sgp30.c b/drivers/iio/chemical/sgp30.c
new file mode 100644
index 000000000..1029c457b
--- /dev/null
+++ b/drivers/iio/chemical/sgp30.c
@@ -0,0 +1,589 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * sgp30.c - Support for Sensirion SGP Gas Sensors
+ *
+ * Copyright (C) 2018 Andreas Brauchli <andreas.brauchli@sensirion.com>
+ *
+ * I2C slave address: 0x58
+ *
+ * Datasheets:
+ * https://www.sensirion.com/file/datasheet_sgp30
+ * https://www.sensirion.com/file/datasheet_sgpc3
+ *
+ * TODO:
+ * - baseline support
+ * - humidity compensation
+ * - power mode switching (SGPC3)
+ */
+
+#include <linux/crc8.h>
+#include <linux/delay.h>
+#include <linux/kthread.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define SGP_WORD_LEN 2
+#define SGP_CRC8_POLYNOMIAL 0x31
+#define SGP_CRC8_INIT 0xff
+#define SGP_CRC8_LEN 1
+#define SGP_CMD(cmd_word) cpu_to_be16(cmd_word)
+#define SGP_CMD_DURATION_US 12000
+#define SGP_MEASUREMENT_DURATION_US 50000
+#define SGP_CMD_LEN SGP_WORD_LEN
+#define SGP_CMD_MAX_BUF_SIZE (SGP_CMD_LEN + 2 * SGP_WORD_LEN)
+#define SGP_MEASUREMENT_LEN 2
+#define SGP30_MEASURE_INTERVAL_HZ 1
+#define SGPC3_MEASURE_INTERVAL_HZ 2
+#define SGP_VERS_PRODUCT(data) ((((data)->feature_set) & 0xf000) >> 12)
+#define SGP_VERS_RESERVED(data) ((((data)->feature_set) & 0x0800) >> 11)
+#define SGP_VERS_GEN(data) ((((data)->feature_set) & 0x0600) >> 9)
+#define SGP_VERS_ENG_BIT(data) ((((data)->feature_set) & 0x0100) >> 8)
+#define SGP_VERS_MAJOR(data) ((((data)->feature_set) & 0x00e0) >> 5)
+#define SGP_VERS_MINOR(data) (((data)->feature_set) & 0x001f)
+
+DECLARE_CRC8_TABLE(sgp_crc8_table);
+
+enum sgp_product_id {
+ SGP30 = 0,
+ SGPC3,
+};
+
+enum sgp30_channel_idx {
+ SGP30_IAQ_TVOC_IDX = 0,
+ SGP30_IAQ_CO2EQ_IDX,
+ SGP30_SIG_ETOH_IDX,
+ SGP30_SIG_H2_IDX,
+};
+
+enum sgpc3_channel_idx {
+ SGPC3_IAQ_TVOC_IDX = 10,
+ SGPC3_SIG_ETOH_IDX,
+};
+
+enum sgp_cmd {
+ SGP_CMD_IAQ_INIT = SGP_CMD(0x2003),
+ SGP_CMD_IAQ_MEASURE = SGP_CMD(0x2008),
+ SGP_CMD_GET_FEATURE_SET = SGP_CMD(0x202f),
+ SGP_CMD_GET_SERIAL_ID = SGP_CMD(0x3682),
+
+ SGP30_CMD_MEASURE_SIGNAL = SGP_CMD(0x2050),
+
+ SGPC3_CMD_MEASURE_RAW = SGP_CMD(0x2046),
+};
+
+struct sgp_version {
+ u8 major;
+ u8 minor;
+};
+
+struct sgp_crc_word {
+ __be16 value;
+ u8 crc8;
+} __attribute__((__packed__));
+
+union sgp_reading {
+ u8 start;
+ struct sgp_crc_word raw_words[4];
+};
+
+enum _iaq_buffer_state {
+ IAQ_BUFFER_EMPTY = 0,
+ IAQ_BUFFER_DEFAULT_VALS,
+ IAQ_BUFFER_VALID,
+};
+
+struct sgp_data {
+ struct i2c_client *client;
+ struct task_struct *iaq_thread;
+ struct mutex data_lock;
+ unsigned long iaq_init_start_jiffies;
+ unsigned long iaq_defval_skip_jiffies;
+ u16 product_id;
+ u16 feature_set;
+ unsigned long measure_interval_jiffies;
+ enum sgp_cmd iaq_init_cmd;
+ enum sgp_cmd measure_iaq_cmd;
+ enum sgp_cmd measure_gas_signals_cmd;
+ union sgp_reading buffer;
+ union sgp_reading iaq_buffer;
+ enum _iaq_buffer_state iaq_buffer_state;
+};
+
+struct sgp_device {
+ const struct iio_chan_spec *channels;
+ int num_channels;
+};
+
+static const struct sgp_version supported_versions_sgp30[] = {
+ {
+ .major = 1,
+ .minor = 0,
+ },
+};
+
+static const struct sgp_version supported_versions_sgpc3[] = {
+ {
+ .major = 0,
+ .minor = 4,
+ },
+};
+
+static const struct iio_chan_spec sgp30_channels[] = {
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_VOC,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .address = SGP30_IAQ_TVOC_IDX,
+ },
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_CO2,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .address = SGP30_IAQ_CO2EQ_IDX,
+ },
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_ETHANOL,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .address = SGP30_SIG_ETOH_IDX,
+ },
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_H2,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .address = SGP30_SIG_H2_IDX,
+ },
+};
+
+static const struct iio_chan_spec sgpc3_channels[] = {
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_VOC,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .address = SGPC3_IAQ_TVOC_IDX,
+ },
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_ETHANOL,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .address = SGPC3_SIG_ETOH_IDX,
+ },
+};
+
+static const struct sgp_device sgp_devices[] = {
+ [SGP30] = {
+ .channels = sgp30_channels,
+ .num_channels = ARRAY_SIZE(sgp30_channels),
+ },
+ [SGPC3] = {
+ .channels = sgpc3_channels,
+ .num_channels = ARRAY_SIZE(sgpc3_channels),
+ },
+};
+
+/**
+ * sgp_verify_buffer() - verify the checksums of the data buffer words
+ *
+ * @data: SGP data
+ * @buf: Raw data buffer
+ * @word_count: Num data words stored in the buffer, excluding CRC bytes
+ *
+ * Return: 0 on success, negative error otherwise.
+ */
+static int sgp_verify_buffer(const struct sgp_data *data,
+ union sgp_reading *buf, size_t word_count)
+{
+ size_t size = word_count * (SGP_WORD_LEN + SGP_CRC8_LEN);
+ int i;
+ u8 crc;
+ u8 *data_buf = &buf->start;
+
+ for (i = 0; i < size; i += SGP_WORD_LEN + SGP_CRC8_LEN) {
+ crc = crc8(sgp_crc8_table, &data_buf[i], SGP_WORD_LEN,
+ SGP_CRC8_INIT);
+ if (crc != data_buf[i + SGP_WORD_LEN]) {
+ dev_err(&data->client->dev, "CRC error\n");
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * sgp_read_cmd() - reads data from sensor after issuing a command
+ * The caller must hold data->data_lock for the duration of the call.
+ * @data: SGP data
+ * @cmd: SGP Command to issue
+ * @buf: Raw data buffer to use
+ * @word_count: Num words to read, excluding CRC bytes
+ * @duration_us: Time taken to sensor to take a reading and data to be ready.
+ *
+ * Return: 0 on success, negative error otherwise.
+ */
+static int sgp_read_cmd(struct sgp_data *data, enum sgp_cmd cmd,
+ union sgp_reading *buf, size_t word_count,
+ unsigned long duration_us)
+{
+ int ret;
+ struct i2c_client *client = data->client;
+ size_t size = word_count * (SGP_WORD_LEN + SGP_CRC8_LEN);
+ u8 *data_buf;
+
+ ret = i2c_master_send(client, (const char *)&cmd, SGP_CMD_LEN);
+ if (ret != SGP_CMD_LEN)
+ return -EIO;
+ usleep_range(duration_us, duration_us + 1000);
+
+ if (word_count == 0)
+ return 0;
+
+ data_buf = &buf->start;
+ ret = i2c_master_recv(client, data_buf, size);
+ if (ret < 0)
+ return ret;
+ if (ret != size)
+ return -EIO;
+
+ return sgp_verify_buffer(data, buf, word_count);
+}
+
+/**
+ * sgp_measure_iaq() - measure and retrieve IAQ values from sensor
+ * The caller must hold data->data_lock for the duration of the call.
+ * @data: SGP data
+ *
+ * Return: 0 on success, -EBUSY on default values, negative error
+ * otherwise.
+ */
+
+static int sgp_measure_iaq(struct sgp_data *data)
+{
+ int ret;
+ /* data contains default values */
+ bool default_vals = !time_after(jiffies, data->iaq_init_start_jiffies +
+ data->iaq_defval_skip_jiffies);
+
+ ret = sgp_read_cmd(data, data->measure_iaq_cmd, &data->iaq_buffer,
+ SGP_MEASUREMENT_LEN, SGP_MEASUREMENT_DURATION_US);
+ if (ret < 0)
+ return ret;
+
+ data->iaq_buffer_state = IAQ_BUFFER_DEFAULT_VALS;
+
+ if (default_vals)
+ return -EBUSY;
+
+ data->iaq_buffer_state = IAQ_BUFFER_VALID;
+
+ return 0;
+}
+
+static void sgp_iaq_thread_sleep_until(const struct sgp_data *data,
+ unsigned long sleep_jiffies)
+{
+ const long IAQ_POLL = 50000;
+
+ while (!time_after(jiffies, sleep_jiffies)) {
+ usleep_range(IAQ_POLL, IAQ_POLL + 10000);
+ if (kthread_should_stop() || data->iaq_init_start_jiffies == 0)
+ return;
+ }
+}
+
+static int sgp_iaq_threadfn(void *p)
+{
+ struct sgp_data *data = (struct sgp_data *)p;
+ unsigned long next_update_jiffies;
+ int ret;
+
+ while (!kthread_should_stop()) {
+ mutex_lock(&data->data_lock);
+ if (data->iaq_init_start_jiffies == 0) {
+ ret = sgp_read_cmd(data, data->iaq_init_cmd, NULL, 0,
+ SGP_CMD_DURATION_US);
+ if (ret < 0)
+ goto unlock_sleep_continue;
+ data->iaq_init_start_jiffies = jiffies;
+ }
+
+ ret = sgp_measure_iaq(data);
+ if (ret && ret != -EBUSY) {
+ dev_warn(&data->client->dev,
+ "IAQ measurement error [%d]\n", ret);
+ }
+unlock_sleep_continue:
+ next_update_jiffies = jiffies + data->measure_interval_jiffies;
+ mutex_unlock(&data->data_lock);
+ sgp_iaq_thread_sleep_until(data, next_update_jiffies);
+ }
+
+ return 0;
+}
+
+static int sgp_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct sgp_data *data = iio_priv(indio_dev);
+ struct sgp_crc_word *words;
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ mutex_lock(&data->data_lock);
+ if (data->iaq_buffer_state != IAQ_BUFFER_VALID) {
+ mutex_unlock(&data->data_lock);
+ return -EBUSY;
+ }
+ words = data->iaq_buffer.raw_words;
+ switch (chan->address) {
+ case SGP30_IAQ_TVOC_IDX:
+ case SGPC3_IAQ_TVOC_IDX:
+ *val = 0;
+ *val2 = be16_to_cpu(words[1].value);
+ ret = IIO_VAL_INT_PLUS_NANO;
+ break;
+ case SGP30_IAQ_CO2EQ_IDX:
+ *val = 0;
+ *val2 = be16_to_cpu(words[0].value);
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ mutex_unlock(&data->data_lock);
+ break;
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&data->data_lock);
+ if (chan->address == SGPC3_SIG_ETOH_IDX) {
+ if (data->iaq_buffer_state == IAQ_BUFFER_EMPTY)
+ ret = -EBUSY;
+ else
+ ret = 0;
+ words = data->iaq_buffer.raw_words;
+ } else {
+ ret = sgp_read_cmd(data, data->measure_gas_signals_cmd,
+ &data->buffer, SGP_MEASUREMENT_LEN,
+ SGP_MEASUREMENT_DURATION_US);
+ words = data->buffer.raw_words;
+ }
+ if (ret) {
+ mutex_unlock(&data->data_lock);
+ return ret;
+ }
+
+ switch (chan->address) {
+ case SGP30_SIG_ETOH_IDX:
+ *val = be16_to_cpu(words[1].value);
+ ret = IIO_VAL_INT;
+ break;
+ case SGPC3_SIG_ETOH_IDX:
+ case SGP30_SIG_H2_IDX:
+ *val = be16_to_cpu(words[0].value);
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ mutex_unlock(&data->data_lock);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static int sgp_check_compat(struct sgp_data *data,
+ unsigned int product_id)
+{
+ struct device *dev = &data->client->dev;
+ const struct sgp_version *supported_versions;
+ u16 ix, num_fs;
+ u16 product, generation, major, minor;
+
+ /* driver does not match product */
+ generation = SGP_VERS_GEN(data);
+ if (generation != 0) {
+ dev_err(dev,
+ "incompatible product generation %d != 0", generation);
+ return -ENODEV;
+ }
+
+ product = SGP_VERS_PRODUCT(data);
+ if (product != product_id) {
+ dev_err(dev, "sensor reports a different product: 0x%04hx\n",
+ product);
+ return -ENODEV;
+ }
+
+ if (SGP_VERS_RESERVED(data))
+ dev_warn(dev, "reserved bit is set\n");
+
+ /* engineering samples are not supported: no interface guarantees */
+ if (SGP_VERS_ENG_BIT(data))
+ return -ENODEV;
+
+ switch (product) {
+ case SGP30:
+ supported_versions = supported_versions_sgp30;
+ num_fs = ARRAY_SIZE(supported_versions_sgp30);
+ break;
+ case SGPC3:
+ supported_versions = supported_versions_sgpc3;
+ num_fs = ARRAY_SIZE(supported_versions_sgpc3);
+ break;
+ default:
+ return -ENODEV;
+ }
+
+ major = SGP_VERS_MAJOR(data);
+ minor = SGP_VERS_MINOR(data);
+ for (ix = 0; ix < num_fs; ix++) {
+ if (major == supported_versions[ix].major &&
+ minor >= supported_versions[ix].minor)
+ return 0;
+ }
+ dev_err(dev, "unsupported sgp version: %d.%d\n", major, minor);
+
+ return -ENODEV;
+}
+
+static void sgp_init(struct sgp_data *data)
+{
+ data->iaq_init_cmd = SGP_CMD_IAQ_INIT;
+ data->iaq_init_start_jiffies = 0;
+ data->iaq_buffer_state = IAQ_BUFFER_EMPTY;
+ switch (SGP_VERS_PRODUCT(data)) {
+ case SGP30:
+ data->measure_interval_jiffies = SGP30_MEASURE_INTERVAL_HZ * HZ;
+ data->measure_iaq_cmd = SGP_CMD_IAQ_MEASURE;
+ data->measure_gas_signals_cmd = SGP30_CMD_MEASURE_SIGNAL;
+ data->product_id = SGP30;
+ data->iaq_defval_skip_jiffies = 15 * HZ;
+ break;
+ case SGPC3:
+ data->measure_interval_jiffies = SGPC3_MEASURE_INTERVAL_HZ * HZ;
+ data->measure_iaq_cmd = SGPC3_CMD_MEASURE_RAW;
+ data->measure_gas_signals_cmd = SGPC3_CMD_MEASURE_RAW;
+ data->product_id = SGPC3;
+ data->iaq_defval_skip_jiffies =
+ 43 * data->measure_interval_jiffies;
+ break;
+ }
+}
+
+static const struct iio_info sgp_info = {
+ .read_raw = sgp_read_raw,
+};
+
+static const struct of_device_id sgp_dt_ids[] = {
+ { .compatible = "sensirion,sgp30", .data = (void *)SGP30 },
+ { .compatible = "sensirion,sgpc3", .data = (void *)SGPC3 },
+ { }
+};
+
+static int sgp_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct iio_dev *indio_dev;
+ struct sgp_data *data;
+ unsigned long product_id;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ if (dev_fwnode(dev))
+ product_id = (unsigned long)device_get_match_data(dev);
+ else
+ product_id = id->driver_data;
+
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+ crc8_populate_msb(sgp_crc8_table, SGP_CRC8_POLYNOMIAL);
+ mutex_init(&data->data_lock);
+
+ /* get feature set version and write it to client data */
+ ret = sgp_read_cmd(data, SGP_CMD_GET_FEATURE_SET, &data->buffer, 1,
+ SGP_CMD_DURATION_US);
+ if (ret < 0)
+ return ret;
+
+ data->feature_set = be16_to_cpu(data->buffer.raw_words[0].value);
+
+ ret = sgp_check_compat(data, product_id);
+ if (ret)
+ return ret;
+
+ indio_dev->info = &sgp_info;
+ indio_dev->name = id->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = sgp_devices[product_id].channels;
+ indio_dev->num_channels = sgp_devices[product_id].num_channels;
+
+ sgp_init(data);
+
+ ret = devm_iio_device_register(dev, indio_dev);
+ if (ret) {
+ dev_err(dev, "failed to register iio device\n");
+ return ret;
+ }
+
+ data->iaq_thread = kthread_run(sgp_iaq_threadfn, data,
+ "%s-iaq", data->client->name);
+
+ return 0;
+}
+
+static int sgp_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct sgp_data *data = iio_priv(indio_dev);
+
+ if (data->iaq_thread)
+ kthread_stop(data->iaq_thread);
+
+ return 0;
+}
+
+static const struct i2c_device_id sgp_id[] = {
+ { "sgp30", SGP30 },
+ { "sgpc3", SGPC3 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, sgp_id);
+MODULE_DEVICE_TABLE(of, sgp_dt_ids);
+
+static struct i2c_driver sgp_driver = {
+ .driver = {
+ .name = "sgp30",
+ .of_match_table = sgp_dt_ids,
+ },
+ .probe = sgp_probe,
+ .remove = sgp_remove,
+ .id_table = sgp_id,
+};
+module_i2c_driver(sgp_driver);
+
+MODULE_AUTHOR("Andreas Brauchli <andreas.brauchli@sensirion.com>");
+MODULE_AUTHOR("Pascal Sachs <pascal.sachs@sensirion.com>");
+MODULE_DESCRIPTION("Sensirion SGP gas sensors");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/sps30.c b/drivers/iio/chemical/sps30.c
new file mode 100644
index 000000000..2ea9a5c4d
--- /dev/null
+++ b/drivers/iio/chemical/sps30.c
@@ -0,0 +1,550 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sensirion SPS30 particulate matter sensor driver
+ *
+ * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com>
+ *
+ * I2C slave address: 0x69
+ */
+
+#include <asm/unaligned.h>
+#include <linux/crc8.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#define SPS30_CRC8_POLYNOMIAL 0x31
+/* max number of bytes needed to store PM measurements or serial string */
+#define SPS30_MAX_READ_SIZE 48
+/* sensor measures reliably up to 3000 ug / m3 */
+#define SPS30_MAX_PM 3000
+/* minimum and maximum self cleaning periods in seconds */
+#define SPS30_AUTO_CLEANING_PERIOD_MIN 0
+#define SPS30_AUTO_CLEANING_PERIOD_MAX 604800
+
+/* SPS30 commands */
+#define SPS30_START_MEAS 0x0010
+#define SPS30_STOP_MEAS 0x0104
+#define SPS30_RESET 0xd304
+#define SPS30_READ_DATA_READY_FLAG 0x0202
+#define SPS30_READ_DATA 0x0300
+#define SPS30_READ_SERIAL 0xd033
+#define SPS30_START_FAN_CLEANING 0x5607
+#define SPS30_AUTO_CLEANING_PERIOD 0x8004
+/* not a sensor command per se, used only to distinguish write from read */
+#define SPS30_READ_AUTO_CLEANING_PERIOD 0x8005
+
+enum {
+ PM1,
+ PM2P5,
+ PM4,
+ PM10,
+};
+
+enum {
+ RESET,
+ MEASURING,
+};
+
+struct sps30_state {
+ struct i2c_client *client;
+ /*
+ * Guards against concurrent access to sensor registers.
+ * Must be held whenever sequence of commands is to be executed.
+ */
+ struct mutex lock;
+ int state;
+};
+
+DECLARE_CRC8_TABLE(sps30_crc8_table);
+
+static int sps30_write_then_read(struct sps30_state *state, u8 *txbuf,
+ int txsize, u8 *rxbuf, int rxsize)
+{
+ int ret;
+
+ /*
+ * Sensor does not support repeated start so instead of
+ * sending two i2c messages in a row we just send one by one.
+ */
+ ret = i2c_master_send(state->client, txbuf, txsize);
+ if (ret != txsize)
+ return ret < 0 ? ret : -EIO;
+
+ if (!rxbuf)
+ return 0;
+
+ ret = i2c_master_recv(state->client, rxbuf, rxsize);
+ if (ret != rxsize)
+ return ret < 0 ? ret : -EIO;
+
+ return 0;
+}
+
+static int sps30_do_cmd(struct sps30_state *state, u16 cmd, u8 *data, int size)
+{
+ /*
+ * Internally sensor stores measurements in a following manner:
+ *
+ * PM1: upper two bytes, crc8, lower two bytes, crc8
+ * PM2P5: upper two bytes, crc8, lower two bytes, crc8
+ * PM4: upper two bytes, crc8, lower two bytes, crc8
+ * PM10: upper two bytes, crc8, lower two bytes, crc8
+ *
+ * What follows next are number concentration measurements and
+ * typical particle size measurement which we omit.
+ */
+ u8 buf[SPS30_MAX_READ_SIZE] = { cmd >> 8, cmd };
+ int i, ret = 0;
+
+ switch (cmd) {
+ case SPS30_START_MEAS:
+ buf[2] = 0x03;
+ buf[3] = 0x00;
+ buf[4] = crc8(sps30_crc8_table, &buf[2], 2, CRC8_INIT_VALUE);
+ ret = sps30_write_then_read(state, buf, 5, NULL, 0);
+ break;
+ case SPS30_STOP_MEAS:
+ case SPS30_RESET:
+ case SPS30_START_FAN_CLEANING:
+ ret = sps30_write_then_read(state, buf, 2, NULL, 0);
+ break;
+ case SPS30_READ_AUTO_CLEANING_PERIOD:
+ buf[0] = SPS30_AUTO_CLEANING_PERIOD >> 8;
+ buf[1] = (u8)(SPS30_AUTO_CLEANING_PERIOD & 0xff);
+ fallthrough;
+ case SPS30_READ_DATA_READY_FLAG:
+ case SPS30_READ_DATA:
+ case SPS30_READ_SERIAL:
+ /* every two data bytes are checksummed */
+ size += size / 2;
+ ret = sps30_write_then_read(state, buf, 2, buf, size);
+ break;
+ case SPS30_AUTO_CLEANING_PERIOD:
+ buf[2] = data[0];
+ buf[3] = data[1];
+ buf[4] = crc8(sps30_crc8_table, &buf[2], 2, CRC8_INIT_VALUE);
+ buf[5] = data[2];
+ buf[6] = data[3];
+ buf[7] = crc8(sps30_crc8_table, &buf[5], 2, CRC8_INIT_VALUE);
+ ret = sps30_write_then_read(state, buf, 8, NULL, 0);
+ break;
+ }
+
+ if (ret)
+ return ret;
+
+ /* validate received data and strip off crc bytes */
+ for (i = 0; i < size; i += 3) {
+ u8 crc = crc8(sps30_crc8_table, &buf[i], 2, CRC8_INIT_VALUE);
+
+ if (crc != buf[i + 2]) {
+ dev_err(&state->client->dev,
+ "data integrity check failed\n");
+ return -EIO;
+ }
+
+ *data++ = buf[i];
+ *data++ = buf[i + 1];
+ }
+
+ return 0;
+}
+
+static s32 sps30_float_to_int_clamped(const u8 *fp)
+{
+ int val = get_unaligned_be32(fp);
+ int mantissa = val & GENMASK(22, 0);
+ /* this is fine since passed float is always non-negative */
+ int exp = val >> 23;
+ int fraction, shift;
+
+ /* special case 0 */
+ if (!exp && !mantissa)
+ return 0;
+
+ exp -= 127;
+ if (exp < 0) {
+ /* return values ranging from 1 to 99 */
+ return ((((1 << 23) + mantissa) * 100) >> 23) >> (-exp);
+ }
+
+ /* return values ranging from 100 to 300000 */
+ shift = 23 - exp;
+ val = (1 << exp) + (mantissa >> shift);
+ if (val >= SPS30_MAX_PM)
+ return SPS30_MAX_PM * 100;
+
+ fraction = mantissa & GENMASK(shift - 1, 0);
+
+ return val * 100 + ((fraction * 100) >> shift);
+}
+
+static int sps30_do_meas(struct sps30_state *state, s32 *data, int size)
+{
+ int i, ret, tries = 5;
+ u8 tmp[16];
+
+ if (state->state == RESET) {
+ ret = sps30_do_cmd(state, SPS30_START_MEAS, NULL, 0);
+ if (ret)
+ return ret;
+
+ state->state = MEASURING;
+ }
+
+ while (tries--) {
+ ret = sps30_do_cmd(state, SPS30_READ_DATA_READY_FLAG, tmp, 2);
+ if (ret)
+ return -EIO;
+
+ /* new measurements ready to be read */
+ if (tmp[1] == 1)
+ break;
+
+ msleep_interruptible(300);
+ }
+
+ if (tries == -1)
+ return -ETIMEDOUT;
+
+ ret = sps30_do_cmd(state, SPS30_READ_DATA, tmp, sizeof(int) * size);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < size; i++)
+ data[i] = sps30_float_to_int_clamped(&tmp[4 * i]);
+
+ return 0;
+}
+
+static irqreturn_t sps30_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct sps30_state *state = iio_priv(indio_dev);
+ int ret;
+ struct {
+ s32 data[4]; /* PM1, PM2P5, PM4, PM10 */
+ s64 ts;
+ } scan;
+
+ mutex_lock(&state->lock);
+ ret = sps30_do_meas(state, scan.data, ARRAY_SIZE(scan.data));
+ mutex_unlock(&state->lock);
+ if (ret)
+ goto err;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &scan,
+ iio_get_time_ns(indio_dev));
+err:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int sps30_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct sps30_state *state = iio_priv(indio_dev);
+ int data[4], ret = -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (chan->type) {
+ case IIO_MASSCONCENTRATION:
+ mutex_lock(&state->lock);
+ /* read up to the number of bytes actually needed */
+ switch (chan->channel2) {
+ case IIO_MOD_PM1:
+ ret = sps30_do_meas(state, data, 1);
+ break;
+ case IIO_MOD_PM2P5:
+ ret = sps30_do_meas(state, data, 2);
+ break;
+ case IIO_MOD_PM4:
+ ret = sps30_do_meas(state, data, 3);
+ break;
+ case IIO_MOD_PM10:
+ ret = sps30_do_meas(state, data, 4);
+ break;
+ }
+ mutex_unlock(&state->lock);
+ if (ret)
+ return ret;
+
+ *val = data[chan->address] / 100;
+ *val2 = (data[chan->address] % 100) * 10000;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_MASSCONCENTRATION:
+ switch (chan->channel2) {
+ case IIO_MOD_PM1:
+ case IIO_MOD_PM2P5:
+ case IIO_MOD_PM4:
+ case IIO_MOD_PM10:
+ *val = 0;
+ *val2 = 10000;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static int sps30_do_cmd_reset(struct sps30_state *state)
+{
+ int ret;
+
+ ret = sps30_do_cmd(state, SPS30_RESET, NULL, 0);
+ msleep(300);
+ /*
+ * Power-on-reset causes sensor to produce some glitch on i2c bus and
+ * some controllers end up in error state. Recover simply by placing
+ * some data on the bus, for example STOP_MEAS command, which
+ * is NOP in this case.
+ */
+ sps30_do_cmd(state, SPS30_STOP_MEAS, NULL, 0);
+ state->state = RESET;
+
+ return ret;
+}
+
+static ssize_t start_cleaning_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct sps30_state *state = iio_priv(indio_dev);
+ int val, ret;
+
+ if (kstrtoint(buf, 0, &val) || val != 1)
+ return -EINVAL;
+
+ mutex_lock(&state->lock);
+ ret = sps30_do_cmd(state, SPS30_START_FAN_CLEANING, NULL, 0);
+ mutex_unlock(&state->lock);
+ if (ret)
+ return ret;
+
+ return len;
+}
+
+static ssize_t cleaning_period_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct sps30_state *state = iio_priv(indio_dev);
+ u8 tmp[4];
+ int ret;
+
+ mutex_lock(&state->lock);
+ ret = sps30_do_cmd(state, SPS30_READ_AUTO_CLEANING_PERIOD, tmp, 4);
+ mutex_unlock(&state->lock);
+ if (ret)
+ return ret;
+
+ return sprintf(buf, "%d\n", get_unaligned_be32(tmp));
+}
+
+static ssize_t cleaning_period_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct sps30_state *state = iio_priv(indio_dev);
+ int val, ret;
+ u8 tmp[4];
+
+ if (kstrtoint(buf, 0, &val))
+ return -EINVAL;
+
+ if ((val < SPS30_AUTO_CLEANING_PERIOD_MIN) ||
+ (val > SPS30_AUTO_CLEANING_PERIOD_MAX))
+ return -EINVAL;
+
+ put_unaligned_be32(val, tmp);
+
+ mutex_lock(&state->lock);
+ ret = sps30_do_cmd(state, SPS30_AUTO_CLEANING_PERIOD, tmp, 0);
+ if (ret) {
+ mutex_unlock(&state->lock);
+ return ret;
+ }
+
+ msleep(20);
+
+ /*
+ * sensor requires reset in order to return up to date self cleaning
+ * period
+ */
+ ret = sps30_do_cmd_reset(state);
+ if (ret)
+ dev_warn(dev,
+ "period changed but reads will return the old value\n");
+
+ mutex_unlock(&state->lock);
+
+ return len;
+}
+
+static ssize_t cleaning_period_available_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, "[%d %d %d]\n",
+ SPS30_AUTO_CLEANING_PERIOD_MIN, 1,
+ SPS30_AUTO_CLEANING_PERIOD_MAX);
+}
+
+static IIO_DEVICE_ATTR_WO(start_cleaning, 0);
+static IIO_DEVICE_ATTR_RW(cleaning_period, 0);
+static IIO_DEVICE_ATTR_RO(cleaning_period_available, 0);
+
+static struct attribute *sps30_attrs[] = {
+ &iio_dev_attr_start_cleaning.dev_attr.attr,
+ &iio_dev_attr_cleaning_period.dev_attr.attr,
+ &iio_dev_attr_cleaning_period_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group sps30_attr_group = {
+ .attrs = sps30_attrs,
+};
+
+static const struct iio_info sps30_info = {
+ .attrs = &sps30_attr_group,
+ .read_raw = sps30_read_raw,
+};
+
+#define SPS30_CHAN(_index, _mod) { \
+ .type = IIO_MASSCONCENTRATION, \
+ .modified = 1, \
+ .channel2 = IIO_MOD_ ## _mod, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+ .address = _mod, \
+ .scan_index = _index, \
+ .scan_type = { \
+ .sign = 'u', \
+ .realbits = 19, \
+ .storagebits = 32, \
+ .endianness = IIO_CPU, \
+ }, \
+}
+
+static const struct iio_chan_spec sps30_channels[] = {
+ SPS30_CHAN(0, PM1),
+ SPS30_CHAN(1, PM2P5),
+ SPS30_CHAN(2, PM4),
+ SPS30_CHAN(3, PM10),
+ IIO_CHAN_SOFT_TIMESTAMP(4),
+};
+
+static void sps30_stop_meas(void *data)
+{
+ struct sps30_state *state = data;
+
+ sps30_do_cmd(state, SPS30_STOP_MEAS, NULL, 0);
+}
+
+static const unsigned long sps30_scan_masks[] = { 0x0f, 0x00 };
+
+static int sps30_probe(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev;
+ struct sps30_state *state;
+ u8 buf[32];
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ return -EOPNOTSUPP;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*state));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ state = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ state->client = client;
+ state->state = RESET;
+ indio_dev->info = &sps30_info;
+ indio_dev->name = client->name;
+ indio_dev->channels = sps30_channels;
+ indio_dev->num_channels = ARRAY_SIZE(sps30_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->available_scan_masks = sps30_scan_masks;
+
+ mutex_init(&state->lock);
+ crc8_populate_msb(sps30_crc8_table, SPS30_CRC8_POLYNOMIAL);
+
+ ret = sps30_do_cmd_reset(state);
+ if (ret) {
+ dev_err(&client->dev, "failed to reset device\n");
+ return ret;
+ }
+
+ ret = sps30_do_cmd(state, SPS30_READ_SERIAL, buf, sizeof(buf));
+ if (ret) {
+ dev_err(&client->dev, "failed to read serial number\n");
+ return ret;
+ }
+ /* returned serial number is already NUL terminated */
+ dev_info(&client->dev, "serial number: %s\n", buf);
+
+ ret = devm_add_action_or_reset(&client->dev, sps30_stop_meas, state);
+ if (ret)
+ return ret;
+
+ ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev, NULL,
+ sps30_trigger_handler, NULL);
+ if (ret)
+ return ret;
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id sps30_id[] = {
+ { "sps30" },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, sps30_id);
+
+static const struct of_device_id sps30_of_match[] = {
+ { .compatible = "sensirion,sps30" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, sps30_of_match);
+
+static struct i2c_driver sps30_driver = {
+ .driver = {
+ .name = "sps30",
+ .of_match_table = sps30_of_match,
+ },
+ .id_table = sps30_id,
+ .probe_new = sps30_probe,
+};
+module_i2c_driver(sps30_driver);
+
+MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>");
+MODULE_DESCRIPTION("Sensirion SPS30 particulate matter sensor driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/chemical/vz89x.c b/drivers/iio/chemical/vz89x.c
new file mode 100644
index 000000000..23b22a5f5
--- /dev/null
+++ b/drivers/iio/chemical/vz89x.c
@@ -0,0 +1,412 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * vz89x.c - Support for SGX Sensortech MiCS VZ89X VOC sensors
+ *
+ * Copyright (C) 2015-2018
+ * Author: Matt Ranostay <matt.ranostay@konsulko.com>
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/init.h>
+#include <linux/i2c.h>
+#include <linux/mod_devicetable.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define VZ89X_REG_MEASUREMENT 0x09
+#define VZ89X_REG_MEASUREMENT_RD_SIZE 6
+#define VZ89X_REG_MEASUREMENT_WR_SIZE 3
+
+#define VZ89X_VOC_CO2_IDX 0
+#define VZ89X_VOC_SHORT_IDX 1
+#define VZ89X_VOC_TVOC_IDX 2
+#define VZ89X_VOC_RESISTANCE_IDX 3
+
+#define VZ89TE_REG_MEASUREMENT 0x0c
+#define VZ89TE_REG_MEASUREMENT_RD_SIZE 7
+#define VZ89TE_REG_MEASUREMENT_WR_SIZE 6
+
+#define VZ89TE_VOC_TVOC_IDX 0
+#define VZ89TE_VOC_CO2_IDX 1
+#define VZ89TE_VOC_RESISTANCE_IDX 2
+
+enum {
+ VZ89X,
+ VZ89TE,
+};
+
+struct vz89x_chip_data;
+
+struct vz89x_data {
+ struct i2c_client *client;
+ const struct vz89x_chip_data *chip;
+ struct mutex lock;
+ int (*xfer)(struct vz89x_data *data, u8 cmd);
+
+ bool is_valid;
+ unsigned long last_update;
+ u8 buffer[VZ89TE_REG_MEASUREMENT_RD_SIZE];
+};
+
+struct vz89x_chip_data {
+ bool (*valid)(struct vz89x_data *data);
+ const struct iio_chan_spec *channels;
+ u8 num_channels;
+
+ u8 cmd;
+ u8 read_size;
+ u8 write_size;
+};
+
+static const struct iio_chan_spec vz89x_channels[] = {
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_CO2,
+ .modified = 1,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
+ .address = VZ89X_VOC_CO2_IDX,
+ },
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_VOC,
+ .modified = 1,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .address = VZ89X_VOC_SHORT_IDX,
+ .extend_name = "short",
+ },
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_VOC,
+ .modified = 1,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
+ .address = VZ89X_VOC_TVOC_IDX,
+ },
+ {
+ .type = IIO_RESISTANCE,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .address = VZ89X_VOC_RESISTANCE_IDX,
+ .scan_index = -1,
+ .scan_type = {
+ .endianness = IIO_LE,
+ },
+ },
+};
+
+static const struct iio_chan_spec vz89te_channels[] = {
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_VOC,
+ .modified = 1,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
+ .address = VZ89TE_VOC_TVOC_IDX,
+ },
+
+ {
+ .type = IIO_CONCENTRATION,
+ .channel2 = IIO_MOD_CO2,
+ .modified = 1,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_RAW),
+ .address = VZ89TE_VOC_CO2_IDX,
+ },
+ {
+ .type = IIO_RESISTANCE,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+ .address = VZ89TE_VOC_RESISTANCE_IDX,
+ .scan_index = -1,
+ .scan_type = {
+ .endianness = IIO_BE,
+ },
+ },
+};
+
+static IIO_CONST_ATTR(in_concentration_co2_scale, "0.00000698689");
+static IIO_CONST_ATTR(in_concentration_voc_scale, "0.00000000436681223");
+
+static struct attribute *vz89x_attributes[] = {
+ &iio_const_attr_in_concentration_co2_scale.dev_attr.attr,
+ &iio_const_attr_in_concentration_voc_scale.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group vz89x_attrs_group = {
+ .attrs = vz89x_attributes,
+};
+
+/*
+ * Chipset sometime updates in the middle of a reading causing it to reset the
+ * data pointer, and causing invalid reading of previous data.
+ * We can check for this by reading MSB of the resistance reading that is
+ * always zero, and by also confirming the VOC_short isn't zero.
+ */
+
+static bool vz89x_measurement_is_valid(struct vz89x_data *data)
+{
+ if (data->buffer[VZ89X_VOC_SHORT_IDX] == 0)
+ return true;
+
+ return !!(data->buffer[data->chip->read_size - 1] > 0);
+}
+
+/* VZ89TE device has a modified CRC-8 two complement check */
+static bool vz89te_measurement_is_valid(struct vz89x_data *data)
+{
+ u8 crc = 0;
+ int i, sum = 0;
+
+ for (i = 0; i < (data->chip->read_size - 1); i++) {
+ sum = crc + data->buffer[i];
+ crc = sum;
+ crc += sum / 256;
+ }
+
+ return !((0xff - crc) == data->buffer[data->chip->read_size - 1]);
+}
+
+static int vz89x_i2c_xfer(struct vz89x_data *data, u8 cmd)
+{
+ const struct vz89x_chip_data *chip = data->chip;
+ struct i2c_client *client = data->client;
+ struct i2c_msg msg[2];
+ int ret;
+ u8 buf[6] = { cmd, 0, 0, 0, 0, 0xf3 };
+
+ msg[0].addr = client->addr;
+ msg[0].flags = client->flags;
+ msg[0].len = chip->write_size;
+ msg[0].buf = (char *) &buf;
+
+ msg[1].addr = client->addr;
+ msg[1].flags = client->flags | I2C_M_RD;
+ msg[1].len = chip->read_size;
+ msg[1].buf = (char *) &data->buffer;
+
+ ret = i2c_transfer(client->adapter, msg, 2);
+
+ return (ret == 2) ? 0 : ret;
+}
+
+static int vz89x_smbus_xfer(struct vz89x_data *data, u8 cmd)
+{
+ struct i2c_client *client = data->client;
+ int ret;
+ int i;
+
+ ret = i2c_smbus_write_word_data(client, cmd, 0);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < data->chip->read_size; i++) {
+ ret = i2c_smbus_read_byte(client);
+ if (ret < 0)
+ return ret;
+ data->buffer[i] = ret;
+ }
+
+ return 0;
+}
+
+static int vz89x_get_measurement(struct vz89x_data *data)
+{
+ const struct vz89x_chip_data *chip = data->chip;
+ int ret;
+
+ /* sensor can only be polled once a second max per datasheet */
+ if (!time_after(jiffies, data->last_update + HZ))
+ return data->is_valid ? 0 : -EAGAIN;
+
+ data->is_valid = false;
+ data->last_update = jiffies;
+
+ ret = data->xfer(data, chip->cmd);
+ if (ret < 0)
+ return ret;
+
+ ret = chip->valid(data);
+ if (ret)
+ return -EAGAIN;
+
+ data->is_valid = true;
+
+ return 0;
+}
+
+static int vz89x_get_resistance_reading(struct vz89x_data *data,
+ struct iio_chan_spec const *chan,
+ int *val)
+{
+ u8 *tmp = (u8 *) &data->buffer[chan->address];
+
+ switch (chan->scan_type.endianness) {
+ case IIO_LE:
+ *val = le32_to_cpup((__le32 *) tmp) & GENMASK(23, 0);
+ break;
+ case IIO_BE:
+ *val = be32_to_cpup((__be32 *) tmp) >> 8;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int vz89x_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct vz89x_data *data = iio_priv(indio_dev);
+ int ret = -EINVAL;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&data->lock);
+ ret = vz89x_get_measurement(data);
+ mutex_unlock(&data->lock);
+
+ if (ret)
+ return ret;
+
+ switch (chan->type) {
+ case IIO_CONCENTRATION:
+ *val = data->buffer[chan->address];
+ return IIO_VAL_INT;
+ case IIO_RESISTANCE:
+ ret = vz89x_get_resistance_reading(data, chan, val);
+ if (!ret)
+ return IIO_VAL_INT;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ switch (chan->type) {
+ case IIO_RESISTANCE:
+ *val = 10;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ break;
+ case IIO_CHAN_INFO_OFFSET:
+ switch (chan->channel2) {
+ case IIO_MOD_CO2:
+ *val = 44;
+ *val2 = 250000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_MOD_VOC:
+ *val = -13;
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ return ret;
+}
+
+static const struct iio_info vz89x_info = {
+ .attrs = &vz89x_attrs_group,
+ .read_raw = vz89x_read_raw,
+};
+
+static const struct vz89x_chip_data vz89x_chips[] = {
+ {
+ .valid = vz89x_measurement_is_valid,
+
+ .cmd = VZ89X_REG_MEASUREMENT,
+ .read_size = VZ89X_REG_MEASUREMENT_RD_SIZE,
+ .write_size = VZ89X_REG_MEASUREMENT_WR_SIZE,
+
+ .channels = vz89x_channels,
+ .num_channels = ARRAY_SIZE(vz89x_channels),
+ },
+ {
+ .valid = vz89te_measurement_is_valid,
+
+ .cmd = VZ89TE_REG_MEASUREMENT,
+ .read_size = VZ89TE_REG_MEASUREMENT_RD_SIZE,
+ .write_size = VZ89TE_REG_MEASUREMENT_WR_SIZE,
+
+ .channels = vz89te_channels,
+ .num_channels = ARRAY_SIZE(vz89te_channels),
+ },
+};
+
+static const struct of_device_id vz89x_dt_ids[] = {
+ { .compatible = "sgx,vz89x", .data = (void *) VZ89X },
+ { .compatible = "sgx,vz89te", .data = (void *) VZ89TE },
+ { }
+};
+MODULE_DEVICE_TABLE(of, vz89x_dt_ids);
+
+static int vz89x_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+ struct iio_dev *indio_dev;
+ struct vz89x_data *data;
+ int chip_id;
+
+ indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+ data = iio_priv(indio_dev);
+
+ if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
+ data->xfer = vz89x_i2c_xfer;
+ else if (i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WORD_DATA | I2C_FUNC_SMBUS_BYTE))
+ data->xfer = vz89x_smbus_xfer;
+ else
+ return -EOPNOTSUPP;
+
+ if (!dev_fwnode(dev))
+ chip_id = id->driver_data;
+ else
+ chip_id = (unsigned long)device_get_match_data(dev);
+
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+ data->chip = &vz89x_chips[chip_id];
+ data->last_update = jiffies - HZ;
+ mutex_init(&data->lock);
+
+ indio_dev->info = &vz89x_info;
+ indio_dev->name = dev_name(dev);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ indio_dev->channels = data->chip->channels;
+ indio_dev->num_channels = data->chip->num_channels;
+
+ return devm_iio_device_register(dev, indio_dev);
+}
+
+static const struct i2c_device_id vz89x_id[] = {
+ { "vz89x", VZ89X },
+ { "vz89te", VZ89TE },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, vz89x_id);
+
+static struct i2c_driver vz89x_driver = {
+ .driver = {
+ .name = "vz89x",
+ .of_match_table = vz89x_dt_ids,
+ },
+ .probe = vz89x_probe,
+ .id_table = vz89x_id,
+};
+module_i2c_driver(vz89x_driver);
+
+MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
+MODULE_DESCRIPTION("SGX Sensortech MiCS VZ89X VOC sensors");
+MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-08 04:15:50 +0000