drivers/sensors: Add new driver for scd41 sensor module

Add Sensirion's SCD41 CO2, temperature and humidity sensor driver.

drivers/sensors/Kconfig

@@ -845,6 +845,37 @@ config SCD30_DEBUG
 
 endif # SENSORS_SCD30
 
+config SENSORS_SCD41
+	bool "Sensirion SCD41 CO2, humidity and temperature sensor"
+	default n
+	---help---
+		Enable driver support for the Sensirion SCD41 CO₂, humidity and
+		temperature sensor.
+
+if SENSORS_SCD41
+
+config SCD41_I2C
+	bool "Sensirion SCD41 I2C mode"
+	default y
+	select I2C
+
+config SCD41_I2C_FREQUENCY
+	int "SCD41 I2C frequency"
+	default 100000
+	range 1 100000
+	depends on SCD41_I2C
+	---help---
+		I2C frequency for SCD41. Note, maximum supported frequency for
+		this sensor is 100kHz.
+
+config SCD41_DEBUG
+	bool "Debug support for the SCD41"
+	default n
+	---help---
+		Enables debug features for the SCD41
+
+endif # SENSORS_SCD41
+
 config SENSORS_SGP30
 	bool "Sensirion SGP30 Gas Platform sensor"
 	default n

drivers/sensors/Make.defs

@@ -192,6 +192,10 @@ ifeq ($(CONFIG_SENSORS_SCD30),y)
   CSRCS += scd30.c
 endif
 
+ifeq ($(CONFIG_SENSORS_SCD41),y)
+  CSRCS += scd41.c
+endif
+
 ifeq ($(CONFIG_SENSORS_SGP30),y)
   CSRCS += sgp30.c
 endif

include/nuttx/sensors/scd41.h

@@ -0,0 +1,75 @@
+/****************************************************************************
+ * include/nuttx/sensors/scd41.h
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.  The
+ * ASF licenses this file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the
+ * License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_SENSORS_SCD41_H
+#define __INCLUDE_NUTTX_SENSORS_SCD41_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/sensors/ioctl.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define CONFIG_SCD41_ADDR 0x62
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct i2c_master_s;  /* Forward reference */
+
+struct scd41_conv_data_s
+{
+  float temperature; /* Celsius */
+  float humidity;    /* RH-% */
+  float co2;         /* CO₂ PPM */
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef CONFIG_SCD41_I2C
+/****************************************************************************
+ * Name: scd41_register_i2c
+ *
+ * Description:
+ *   Register the SCD41 character device as 'devpath'
+ *
+ * Input Parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/co2_0"
+ *   i2c     - An instance of the I2C interface to use to communicate with
+ *             the SCD41
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int scd41_register_i2c(FAR const char *devpath,
+                       FAR struct i2c_master_s *i2c);
+
+#endif
+
+#endif /* __INCLUDE_NUTTX_SENSORS_SCD41_H */