drivers/sensors: Add support for Telair T6713 carbon dioxide sensor

drivers/sensors/Kconfig

@@ -477,6 +477,14 @@ config SHT21_DEBUG
 
 endif # SENSORS_SHT21
 
+config SENSORS_T67XX
+	bool "Telair T6713 carbon dioxide sensor"
+	default n
+	select I2C
+	---help---
+		Enable driver support for the Telair T6713 and T6703 carbon
+		dioxide sensors.
+
 config SENSORS_QENCODER
 	bool "Qencoder"
 	default n

drivers/sensors/Make.defs

@@ -141,6 +141,10 @@ ifeq ($(CONFIG_SENSORS_SHT21),y)
   CSRCS += sht21.c
 endif
 
+ifeq ($(CONFIG_SENSORS_T67XX),y)
+  CSRCS += t67xx.c
+endif
+
 endif # CONFIG_I2C
 
 # These drivers depend on SPI support

include/nuttx/sensors/ioctl.h

@@ -1,7 +1,7 @@
 /****************************************************************************
  * include/nuttx/sensors/ioctl.h
  *
- *   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2016-2018 Gregory Nutt. All rights reserved.
  *   Author: Alan Carvalho de Assis <acassis@gmail.com>
  *
  * Redistribution and use in source and binary forms, with or without
@@ -155,4 +155,9 @@
 #define SNIOC_SET_DATA_RATE     _SNIOC(0x003e) /* Arg: LIS3DH_ODR_xxx */
 #define SNIOC_SET_DATA_FORMAT   _SNIOC(0x003f) /* Arg: LIS3DH_FORMAT_xxx */
 
+/* IOCTL commands unique to T67XX */
+
+#define SNIOC_SPCALIB           _SNIOC(0x0040) /* Arg: uint8_t value */
+#define SNIOC_ABCLOGIC          _SNIOC(0x0041) /* Arg: uint8_t value */
+
 #endif /* __INCLUDE_NUTTX_SENSORS_IOCTL_H */

include/nuttx/sensors/t67xx.h

@@ -0,0 +1,105 @@
+/****************************************************************************
+ * include/nuttx/sensors/t67xx.h
+ *
+ *   Copyright (C) 2018 Haltian Ltd. All rights reserved.
+ *   Author: 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_T67XX_H
+#define __INCLUDE_NUTTX_SENSORS_T67XX_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/sensors/ioctl.h>
+
+#if defined(CONFIG_I2C) && defined(CONFIG_SENSORS_T67XX)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#define T67XX_I2C_ADDR 0x15
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct i2c_master_s;
+
+struct t67xx_value_s
+{
+  uint16_t gas_ppm;  /* CO2 level, parts per million */
+  bool warming_up;   /* Warm-up mode, gas_ppm might be imprecise */
+  bool calibrating;  /* Calibration in progress, gas_ppm might be imprecise */
+};
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: t67xx_register
+ *
+ * Description:
+ *   Register the T67XX character device as 'devpath'
+ *
+ * Input Parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/co2_0"
+ *   i2c - An instance of the I2C interface to use to communicate with T67XX
+ *   addr - The I2C address of the T67XX. For T6713 this is initially 0x15
+ *   but it can be changed by the SLAVE ADDRESS command.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int t67xx_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
+                   uint8_t addr);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_I2C && CONFIG_SENSORS_T67XX */
+#endif /* __INCLUDE_NUTTX_SENSORS_T67XX_H */