drivers/sensors/isl29023.c: Add basic driver of ISL29023 ambient light sensor. The basic driver can set operational mode, range, and resolution. It can also read lux value in continuous mode. Interrupt and the alarm is not implemented.

drivers/sensors/Kconfig

@@ -145,6 +145,21 @@ config HCSR04_NPOLLWAITERS
 
 endif # SENSORS_HCSR04
 
+config SENSORS_ISL29023
+	bool "Renesas ISL29023 ALS sensor"
+	default n
+	select I2C
+	---help---
+		Enable driver support for the Renesas ISL29023 ambient light sensor.
+
+if SENSORS_ISL29023
+
+config ISL29023_I2C_FREQUENCY
+	int "ISL29023 I2C frequency"
+	default 400000
+
+endif # SENSORS_ISL29023
+
 config SENSORS_HTS221
 	bool "STMicro HTS221 humidity sensor"
 	default n

drivers/sensors/Make.defs

@@ -121,6 +121,9 @@ ifeq ($(CONFIG_SENSORS_BMP280),y)
   CSRCS += bmp280.c
 endif
 
+ifeq ($(CONFIG_SENSORS_ISL29023),y)
+  CSRCS += isl29023.c
+endif
 
 ifeq ($(CONFIG_SENSORS_HTS221),y)
   CSRCS += hts221.c

include/nuttx/sensors/ioctl.h

@@ -221,4 +221,10 @@
 #define SNIOC_CALIBRATE            _SNIOC(0x0102) /* Arg: b16_t value */
 #define SNIOC_TEMPUPDATE           _SNIOC(0x0103) /* Arg: b16_t value */
 
+/* IOCTL commands unique to the ISL29023 */
+
+#define SNIOC_SET_OPERATIONAL_MODE _SNIOC(0x0060) /* Arg: uint8_t value */
+#define SNIOC_SET_RESOLUTION       _SNIOC(0x0062) /* Arg: uint8_t value */
+#define SNIOC_SET_RANGE            _SNIOC(0x0064) /* Arg: uint8_t value */
+
 #endif /* __INCLUDE_NUTTX_SENSORS_IOCTL_H */

include/nuttx/sensors/isl29023.h

@@ -0,0 +1,126 @@
+/****************************************************************************
+ * include/nuttx/sensors/isl29023.h
+ *
+ *   Copyright (C) 2019 DataVision s.r.o. All rights reserved.
+ *   Authors: Matous Pokorny <matous.pokorny@datavision.cz>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_NUTTX_SENSORS_ISL29023
+#define __INCLUDE_NUTTX_SENSORS_ISL29023
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/sensors/ioctl.h>
+
+#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_ISL29023)
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct i2c_master_s;
+
+enum isl29023_resolution_e
+{
+  ISL29023_RESOLUTION_16BITS =      0x0,
+  ISL29023_RESOLUTION_12BITS =      0x1,
+  ISL29023_RESOLUTION_8BITS =       0x2,
+  ISL29023_RESOLUTION_4BITS =       0x3,
+};
+
+enum isl29023_als_range_e
+{
+  ISL29023_ALS_RANGE_1000 =         0x0,
+  ISL29023_ALS_RANGE_4000 =         0x1,
+  ISL29023_ALS_RANGE_16000 =        0x2,
+  ISL29023_ALS_RANGE_64000 =        0x3,
+};
+
+/* ISL2923 goes to power dowm mode after mode *once */
+
+enum isl29023_operational_mode_e
+{
+  ISL29023_OP_MODE_POWER_DOWN =     0x0,
+  ISL29023_OP_MODE_ALS_ONCE =       0x1,
+  ISL29023_OP_MODE_IR_ONCE =        0x2,
+  ISL29023_OP_MODE_ALS_CONTINUES =  0x5,
+  ISL29023_OP_MODE_IR_CONTINUES =   0x6,
+};
+
+/* Data transfer structure */
+
+struct isl29023_data_s
+{
+  uint16_t lux;               /* Converted lux value */
+  uint16_t raw;               /* Raw unconverted value */
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: isl29023_register
+ *
+ * Description:
+ *   Register the ISL29023 ALS device as 'devpath'
+ *
+ * Input Parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/als0"
+ *   i2c - An instance of the I2C interface to use to communicate with ALS
+ *   addr - The I2C address of the ALS.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int isl29023_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
+                      uint8_t addr);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_I2C && CONFIG_SENSORS_ISL29023 */
+#endif /* __INCLUDE_NUTTX_SENSORS_ISL29023 */