drivers/sensors: add support to MAX44009 ambient light sensor

drivers/sensors/Kconfig

@@ -338,6 +338,34 @@ config ADXL345_REGDEBUG
 
 endif # SENSORS_ADXL345
 
+config SENSORS_MAX44009
+	bool "Maxim MAX44009 ALS sensor"
+	default n
+	select I2C
+	---help---
+		Enables MAX44009 Ambient Light Sensor
+
+if SENSORS_MAX44009
+
+config MAX44009_I2C_FREQUENCY
+	int "MAX44009 I2C frequency"
+	default 400000
+	range 1 400000
+
+config DEBUG_MAX44009
+	bool "Enable debug support for the MAX44009"
+	default n
+	---help---
+		Enables debug support for the MAX44009
+
+config MAX44009_NPOLLWAITERS
+	int "Number of waiters to poll"
+	default 1
+	---help---
+		Number of waiters to poll
+
+endif # SENSORS_MAX44009
+
 config SENSORS_MAX31855
 	bool "Maxim MAX31855 Driver"
 	default n

drivers/sensors/Make.defs

@@ -105,6 +105,10 @@ ifeq ($(CONFIG_SENSORS_LM92),y)
   CSRCS += lm92.c
 endif
 
+ifeq ($(CONFIG_SENSORS_MAX44009),y)
+  CSRCS += max44009.c
+endif
+
 ifeq ($(CONFIG_SENSORS_MB7040),y)
   CSRCS += mb7040.c
 endif

include/nuttx/sensors/ioctl.h

@@ -118,10 +118,10 @@
 /* IOCTL commands to the HTS221 & LPS25H */
 
 #define SNIOC_CFGR              _SNIOC(0x002a)
+#define SNIOC_GET_DEV_ID        _SNIOC(0x002b)
 
 /* IOCTL commands unique to the HTS221 */
 
-#define SNIOC_GET_DEV_ID        _SNIOC(0x002b)
 #define SNIOC_START_CONVERSION  _SNIOC(0x002c)
 #define SNIOC_CHECK_STATUS_REG  _SNIOC(0x002d)
 #define SNIOC_READ_RAW_DATA     _SNIOC(0x002e)
@@ -130,19 +130,23 @@
 
 /* IOCTL commands unique to the LPS25H */
 
-#define SNIOC_GET_DEV_ID        _SNIOC(0x0031)
-#define SNIOC_TEMPERATURE_OUT   _SNIOC(0x0032)
-#define SNIOC_PRESSURE_OUT      _SNIOC(0x0033)
-#define SNIOC_SENSOR_OFF        _SNIOC(0x0034)
+#define SNIOC_TEMPERATURE_OUT   _SNIOC(0x0031)
+#define SNIOC_PRESSURE_OUT      _SNIOC(0x0032)
+#define SNIOC_SENSOR_OFF        _SNIOC(0x0033)
 
 /* IOCTL commands unique to the LIS2DH */
 
-#define SNIOC_WRITESETUP            _SNIOC(0x0035) /* Arg: uint8_t value */
-#define SNIOC_WRITE_INT1THRESHOLD   _SNIOC(0x0036) /* Arg: uint8_t value */
-#define SNIOC_WRITE_INT2THRESHOLD   _SNIOC(0x0037) /* Arg: uint8_t value */
-#define SNIOC_RESET_HPFILTER        _SNIOC(0x0038) /* Arg: uint8_t value */
-#define SNIOC_START_SELFTEST        _SNIOC(0x0039) /* Arg: uint8_t value */
-#define SNIOC_WHO_AM_I              _SNIOC(0x003a)
-#define SNIOC_READ_TEMP             _SNIOC(0x003b) /* Arg: int16_t value */
+#define SNIOC_WRITESETUP            _SNIOC(0x0034) /* Arg: uint8_t value */
+#define SNIOC_WRITE_INT1THRESHOLD   _SNIOC(0x0035) /* Arg: uint8_t value */
+#define SNIOC_WRITE_INT2THRESHOLD   _SNIOC(0x0036) /* Arg: uint8_t value */
+#define SNIOC_RESET_HPFILTER        _SNIOC(0x0037) /* Arg: uint8_t value */
+#define SNIOC_START_SELFTEST        _SNIOC(0x0038) /* Arg: uint8_t value */
+#define SNIOC_WHO_AM_I              _SNIOC(0x0039)
+#define SNIOC_READ_TEMP             _SNIOC(0x003a) /* Arg: int16_t value */
+
+/* IOCTL commands unique to the MAX44009 */
+
+#define SNIOC_INIT              _SNIOC(0x003b)
+#define SNIOC_THRESHOLD         _SNIOC(0x003c)
 
 #endif /* __INCLUDE_NUTTX_SENSORS_IOCTL_H */

include/nuttx/sensors/max44009.h

+/****************************************************************************
+ * include/nuttx/sensors/max44009.h
+ *
+ *   Copyright (C) 2014-2018 Haltian Ltd. All rights reserved.
+ *   Authors: Dmitry Nikolaev <dmitry.nikolaev@haltian.com>
+ *            Juha Niskanen <juha.niskanen@haltian.com>
+ *
+ * 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_MAX44009
+#define __INCLUDE_NUTTX_SENSORS_MAX44009
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/sensors/ioctl.h>
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct i2c_master_s;
+
+/* Integration time, ms */
+
+enum max44009_integration_time_e
+{
+  MAX44009_INTEGR_TIME_800 = 0x0,     /* Preferred mode for boosting
+                                       * low-light sensitivity */
+  MAX44009_INTEGR_TIME_400,
+  MAX44009_INTEGR_TIME_200,
+  MAX44009_INTEGR_TIME_100,   /* Preferred mode for high-brightness
+                               * applications */
+  MAX44009_INTEGR_TIME_50,    /* Manual mode only */
+  MAX44009_INTEGR_TIME_25,    /* Manual mode only */
+  MAX44009_INTEGR_TIME_12_5,  /* Manual mode only */
+  MAX44009_INTEGR_TIME_6_25   /* Manual mode only */
+};
+
+/* Board configuration data structure */
+
+struct max44009_config_s
+{
+  CODE int (*irq_attach)(FAR struct max44009_config_s * state, xcpt_t isr, FAR void *arg);
+  CODE void (*irq_enable)(FAR const struct max44009_config_s * state, bool enable);
+  CODE int (*set_power)(FAR const struct max44009_config_s * state, bool on);
+};
+
+/* Configuration structure for MAX44009 */
+
+struct max44009_init_s
+{
+  bool is_cont;               /* Needs more power, if it's in continuous
+                               * mode. This one is useful in test-mode for
+                               * instance */
+  bool is_manual;             /* Timer's settings must be specified manually */
+  bool is_cdr;                /* Current division ratio: false - All of the
+                               * photodiode current goes to the ADC, true -
+                               * 1/8 (must be used in high-brightness
+                               * situations) */
+  enum max44009_integration_time_e integr_time;  /* Integration time */
+};
+
+struct max44009_threshold_s
+{
+  uint8_t upper_threshold;    /* Upper threshold high-byte */
+  uint8_t lower_threshold;    /* Lower threshold high-byte */
+  uint8_t threshold_timer;    /* 0 - interrupt will be triggered as soon as
+                               * the light level exceeds either threshold */
+} ;
+
+/* Data transfer structure */
+
+struct max44009_data_s
+{
+  uint32_t lux;               /* Converted lux value */
+  uint16_t mlux;              /* Converted millilux (decimals for lux) */
+  uint16_t raw_value;         /* Raw unconverted value */
+  uint8_t  test_value;        /* For self-test only */
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+int max44009_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
+                      uint8_t addr, FAR struct max44009_config_s *config);
+
+#endif /* __INCLUDE_NUTTX_SENSORS_MAX44009 */