Feature: Sensor: Add sensor driver for MAX86178

CHAMPION-51

Add a driver for the Maxim MAX86178 vital-sign AFE, used for ECG and PPG measurements.

Change-Id: Iae10315abf9d1889af5257495da64c3221014dd7
Signed-off-by: liucheng5 <liucheng5@xiaomi.com>

drivers/sensors/Kconfig

@@ -824,6 +824,40 @@ config SENSORS_MAX6675
 	---help---
 		Enables support for the MAX6675 driver
 
+config SENSORS_MAX86178
+	bool "Maxim MAX86178 Vital-Sign AFE Support"
+	default n
+	---help---
+		Enable support for the Maxim max86178 Vital-Sign AFE
+
+if SENSORS_MAX86178
+
+choice
+	prompt "MAX86178 Interface"
+	default SENSORS_MAX86178_SPI
+
+config SENSORS_MAX86178_SPI
+	bool "MAX86178 SPI Interface"
+	select SPI
+	---help---
+		Enables support for the SPI interface
+
+config SENSORS_MAX86178_I2C
+	bool "MAX86178 I2C Interface"
+	select I2C
+	---help---
+		Enables support for the I2C interface
+
+endchoice
+
+config SENSORS_MAX86178_FIFO_SLOTS_NUMBER
+	int "The number of fifo slots for sensor MAX86178"
+	default 100
+	---help---
+		The number of fifo slots for sensor MAX86178.
+
+endif # SENSORS_MAX86178
+
 config SENSORS_LIS3MDL
 	bool "STMicro LIS3MDL 3-Axis magnetometer support"
 	default n

drivers/sensors/Make.defs

@@ -294,6 +294,10 @@ endif
 
 endif # CONFIG_1WIRE
 
+ifeq ($(CONFIG_SENSORS_MAX86178),y)
+  CSRCS += max86178.c
+endif
+
 ifeq ($(CONFIG_SENSORS_MPU60X0),y)
   CSRCS += mpu60x0.c
 endif

include/nuttx/sensors/max86178.h

@@ -0,0 +1,108 @@
+/****************************************************************************
+ * include/nuttx/sensors/max86178.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_MAX86178_H
+#define __INCLUDE_NUTTX_SENSORS_MAX86178_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/ioexpander/ioexpander.h>
+#ifdef CONFIG_SENSORS_MAX86178_I2C
+#  include <nuttx/i2c/i2c_master.h>
+#else /* CONFIG_SENSORS_MAX86178_SPI */
+#  include <nuttx/spi/spi_transfer.h>
+#endif
+
+#ifdef CONFIG_SENSORS_MAX86178
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct max86178_config_s
+{
+  int                         freq;       /* Digital interface frequency */
+  int                         intpin;     /* Interrupt pin */
+#ifdef CONFIG_SENSORS_MAX86178_I2C
+  FAR struct i2c_master_s     *i2c;       /* I2C interface instance */
+  uint8_t                      i2c_addr;  /* I2C address. not left-shifted */
+#else /* CONFIG_SENSORS_MAX86178_SPI */
+  FAR struct spi_dev_s        *spi;       /* SPI interface instance */
+  uint32_t                    cs;         /* SPI CS pin */
+#endif
+  FAR struct ioexpander_dev_s *ioedev;    /* Ioexpander device */
+};
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Inline Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: max86178_register
+ *
+ * Description:
+ *   Register the MAX86178 character device as 'devno'
+ *
+ * Input Parameters:
+ *   devno   - The user specifies device number, from 0.
+ *   dev     - An instance of the I2C/SPI interface to communicate with
+ *             MAX86178.
+ *
+ * Returned Value:
+ *   Return 0 if the driver was successfully initialize; A negative errno
+ *   value is returned on any failure.
+ *
+ * Assumptions/Limitations:
+ *   none
+ *
+ ****************************************************************************/
+
+int max86178_register(int devno, FAR const struct max86178_config_s *config);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_SENSORS_MAX86178 */
+#endif /* __INCLUDE_NUTTX_SENSORS_MAX86178_H */