feature(nuttx sensor driver): add ak09919c mag sensor dirver.

Add ak09919c mag sensor dirver.

Change-Id: Ie90149689a50dc4f68aa1802d00bb818092ed795
Signed-off-by: xiatian6 <xiatian6@xiaomi.com>

drivers/sensors/Kconfig

@@ -62,6 +62,21 @@ config SENSORS_AK09912
 	---help---
 		Enable driver for AK09911/AK09912 Compass sensor.
 
+config SENSORS_AK09919C
+	bool "Asahi AK09919C Compass Sensor"
+	default n
+	select I2C
+	---help---
+		Enable driver for AK09919C Compass sensor.
+
+config SENSORS_AK09919C_BUFFER_NUMBER
+	int "The nunmber of circular buffer for sensor AK09919C"
+	default 1
+	depends on SENSORS_AK09919C
+	---help---
+		The number of the circular buffer used. If the value equal to zero,
+		indicates that the circular buffer is disabled.
+
 config SENSORS_AS5048B
 	bool "AMS AS5048B Magnetic Rotary Encoder support"
 	default n

drivers/sensors/Make.defs

@@ -60,6 +60,10 @@ ifeq ($(CONFIG_SENSORS_AK09912),y)
   CSRCS += ak09912.c
 endif
 
+ifeq ($(CONFIG_SENSORS_AK09919C),y)
+  CSRCS += ak09919c.c
+endif
+
 ifeq ($(CONFIG_SENSORS_AS5048B),y)
   CSRCS += as5048b.c
 endif

include/nuttx/sensors/ak09919c.h

@@ -0,0 +1,85 @@
+/****************************************************************************
+ * include/nuttx/sensors/ak09919c.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_AK09919C_H
+#define __INCLUDE_NUTTX_SENSORS_AK09919C_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+#include <nuttx/config.h>
+#include <nuttx/i2c/i2c_master.h>
+
+#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_AK09919C)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct ak09919c_config_s
+{
+  uint8_t addr;                          /* I2C address */
+  int freq;                              /* I2C frequency */
+  FAR struct i2c_master_s *i2c;          /* I2C interface */
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: ak09919c_register
+ *
+ * Description:
+ *   Register the AK09919C character device as 'devpath'.
+ *
+ * Input Parameters:
+ *   devno   - The device number, used to build the device path
+ *             as /dev/sensor/magN
+ *   i2c     - An I2C driver instance.
+ *   config  - configuration for the AK09919C driver. For details see
+ *             description above.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int ak09919c_register(int devno, FAR struct ak09919c_config_s *config);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_I2C && CONFIG_AK09919C */
+#endif /* __INCLUDE_NUTTX_SENSORS_AK09919C_H */