drivers/sensors/adt7320.c: Add support for the ADT7320 temperature sensor.

include/nuttx/sensors/adt7320.h

@@ -0,0 +1,97 @@
+/****************************************************************************
+ * include/nuttx/sensors/adt7320.h
+ *
+ *   Copyright (C) 2019 Augusto Fraga Giachero
+ *   Author: Augusto Fraga Giachero <afg@augustofg.net>
+ *
+ * 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_ADT7320_H
+#define __INCLUDE_NUTTX_SENSORS_ADT7320_H
+
+/****************************************************************************
+ * Driver usage notes:
+ *
+ * This driver supports the Common Sensor Register Interface.
+ * See drivers/sensors/README.txt for details.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/irq.h>
+#include <nuttx/config.h>
+#include <nuttx/sensors/ioctl.h>
+#include <nuttx/spi/spi.h>
+
+#if defined(CONFIG_SPI) && defined(CONFIG_SENSORS_ADT7320)
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: adt7320_register
+ *
+ * Description:
+ *   Register the ADT7320 character device as 'devpath'
+ *
+ * Input Parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/temp0"
+ *   spi     - An instance of the SPI interface to use to communicate with
+ *   spidev - Number of the spi device (used to determine what chip
+ *            should be selected).
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int adt7320_register(FAR const char *devpath,
+                     FAR struct spi_dev_s *spi,
+                     int spidev);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_SPI && CONFIG_SENSORS_ADT7320 && CONFIG_SPI_EXCHANGE */
+#endif /* __INCLUDE_NUTTX_SENSORS_ADT7320_H */

include/nuttx/sensors/ioctl.h

@@ -1,7 +1,7 @@
 /************************************************************************************
  * include/nuttx/sensors/ioctl.h
  *
- *   Copyright (C) 2016-2018 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2016-2019 Gregory Nutt. All rights reserved.
  *   Author: Alan Carvalho de Assis <acassis@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -210,6 +210,10 @@
 #define SNIOC_SET_CLEAN_INTERVAL   _SNIOC(0x005d) /* Arg: uint32_t value (seconds) */
 #define SNIOC_START_FAN_CLEANING   _SNIOC(0x005e) /* Arg: None */
 
+/* IOCTL commands unique to the ADT7320 */
+
+#define SNIOC_READSTAT             _SNIOC(0x005f) /* Arg: uint8_t* pointer */
+
 /* IOCTL commands unique to the VL53L1X */
 
 #define SNIOC_DISTANCESHORT        _SNIOC(0x0100) /* Arg: None */