Add Vishay VEML6070 driver and support for STM32F103-Minimum board

configs/stm32f103-minimum/README.txt

@@ -636,3 +636,9 @@ Where <subdir> is one of the following:
       CONFIG_CDCACM_CONSOLE=y       : The CDC/ACM serial device is NOT the console
       CONFIG_PL2303=y               : The Prolifics PL2303 emulation is enabled
       CONFIG_PL2303_CONSOLE=y       : The PL2303 serial device is the console
+
+  veml6070:
+  --------
+    This is a config example to use the Vishay VEML6070 UV-A sensor. To use this
+    sensor you need to connect PB6 (I2C1 CLK) to SCL; PB7 (I2C1 SDA) to SDA of
+    sensor module. I used a GY-VEML6070 module to test this driver.

configs/stm32f103-minimum/src/Makefile

@@ -73,4 +73,8 @@ ifeq ($(CONFIG_LCD_ST7567),y)
 CSRCS += stm32_lcd.c
 endif
 
+ifeq ($(CONFIG_VEML6070),y)
+CSRCS += stm32_veml6070.c
+endif
+
 include $(TOPDIR)/configs/Board.mk

configs/stm32f103-minimum/src/stm32_bringup.c

@@ -163,5 +163,15 @@ int stm32_bringup(void)
     }
 #endif
 
+#ifdef CONFIG_VEML6070
+  /* Register the UV-A light sensor */
+
+  ret = stm32_veml6070initialize("/dev/uvlight0");
+  if (ret < 0)
+    {
+      syslog(LOG_ERR, "ERROR: stm32_veml6070initialize() failed: %d\n", ret);
+    }
+#endif
+
   return ret;
 }

configs/stm32f103-minimum/src/stm32_veml6070.c

@@ -0,0 +1,105 @@
+/************************************************************************************
+ * configs/stm32f103-minimum/src/stm32_veml6070.c
+ *
+ *   Copyright (C) 2016 Alan Carvalho de Assis. All rights reserved.
+ *   Author: Alan Carvalho de Assis <acassis@gmail.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.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <debug.h>
+
+#include <nuttx/spi/spi.h>
+#include <nuttx/sensors/veml6070.h>
+
+#include "stm32.h"
+#include "stm32_i2c.h"
+#include "stm32f103_minimum.h"
+
+#if defined(CONFIG_I2C) && defined(CONFIG_VEML6070)
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+#define VEML6070_I2C_PORTNO 1   /* On I2C1 */
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: stm32_veml6070initialize
+ *
+ * Description:
+ *   Initialize and register the VEML6070 UV-A Light sensor.
+ *
+ * Input parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/uvlight0"
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ************************************************************************************/
+
+int stm32_veml6070initialize(FAR const char *devpath)
+{
+  FAR struct i2c_master_s *i2c;
+  int ret;
+
+  sninfo("Initializing VEML6070!\n");
+
+  /* Initialize I2C */
+
+  i2c = stm32_i2cbus_initialize(VEML6070_I2C_PORTNO);
+
+  if (!i2c)
+    {
+      return -ENODEV;
+    }
+
+  /* Then register the light sensor */
+
+  ret = veml6070_register(devpath, i2c, VEML6070_I2C_DATA_LSB_CMD_ADDR);
+  if (ret < 0)
+    {
+      snerr("ERROR: Error registering BM180\n");
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_I2C && CONFIG_VEML6070 && CONFIG_STM32_I2C1 */

configs/stm32f103-minimum/src/stm32f103_minimum.h

@@ -192,5 +192,18 @@ int stm32_mfrc522initialize(FAR const char *devpath);
 int stm32_tone_setup(void);
 #endif
 
+/***********************************************************************************
+ * Name: stm32_veml6070initialize
+ *
+ * Description:
+ *   Called to configure an I2C and to register VEML6070 for the stm32f103-minimum
+ *   board.
+ *
+ ***********************************************************************************/
+
+#ifdef CONFIG_VEML6070
+int stm32_veml6070initialize(FAR const char *devpath);
+#endif
+
 #endif /* __ASSEMBLY__ */
 #endif /* __CONFIGS_STM32F103_MINIMUM_SRC_STM32F103_MINIMUM_H */

configs/stm32f103-minimum/veml6070/Make.defs

@@ -0,0 +1,113 @@
+############################################################################
+# configs/stm32f103-minimum/vem6070/Make.defs
+#
+#   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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.
+#
+############################################################################
+
+include ${TOPDIR}/.config
+include ${TOPDIR}/tools/Config.mk
+include ${TOPDIR}/arch/arm/src/armv7-m/Toolchain.defs
+
+LDSCRIPT = ld.script
+
+ifeq ($(WINTOOL),y)
+  # Windows-native toolchains
+  DIRLINK = $(TOPDIR)/tools/copydir.sh
+  DIRUNLINK = $(TOPDIR)/tools/unlink.sh
+  MKDEP = $(TOPDIR)/tools/mkwindeps.sh
+  ARCHINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)/include}"
+  ARCHXXINCLUDES = -I. -isystem "${shell cygpath -w $(TOPDIR)/include}" -isystem "${shell cygpath -w $(TOPDIR)/include/cxx}"
+  ARCHSCRIPT = -T "${shell cygpath -w $(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/$(LDSCRIPT)}"
+else
+  # Linux/Cygwin-native toolchain
+  MKDEP = $(TOPDIR)/tools/mkdeps$(HOSTEXEEXT)
+  ARCHINCLUDES = -I. -isystem $(TOPDIR)/include
+  ARCHXXINCLUDES = -I. -isystem $(TOPDIR)/include -isystem $(TOPDIR)/include/cxx
+  ARCHSCRIPT = -T$(TOPDIR)/configs/$(CONFIG_ARCH_BOARD)/scripts/$(LDSCRIPT)
+endif
+
+CC = $(CROSSDEV)gcc
+CXX = $(CROSSDEV)g++
+CPP = $(CROSSDEV)gcc -E
+LD = $(CROSSDEV)ld
+AR = $(CROSSDEV)ar rcs
+NM = $(CROSSDEV)nm
+OBJCOPY = $(CROSSDEV)objcopy
+OBJDUMP = $(CROSSDEV)objdump
+
+ARCHCCVERSION = ${shell $(CC) -v 2>&1 | sed -n '/^gcc version/p' | sed -e 's/^gcc version \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g' -e '1q'}
+ARCHCCMAJOR = ${shell echo $(ARCHCCVERSION) | cut -d'.' -f1}
+
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  ARCHOPTIMIZATION = -g
+endif
+
+ifneq ($(CONFIG_DEBUG_NOOPT),y)
+  ARCHOPTIMIZATION += $(MAXOPTIMIZATION) -fno-strict-aliasing -fno-strength-reduce -fomit-frame-pointer
+endif
+
+ARCHCFLAGS = -fno-builtin
+ARCHCXXFLAGS = -fno-builtin -fno-exceptions -fcheck-new
+ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
+ARCHWARNINGSXX = -Wall -Wshadow -Wundef
+ARCHDEFINES =
+ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10
+
+CFLAGS = $(ARCHCFLAGS) $(ARCHWARNINGS) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CPICFLAGS = $(ARCHPICFLAGS) $(CFLAGS)
+CXXFLAGS = $(ARCHCXXFLAGS) $(ARCHWARNINGSXX) $(ARCHOPTIMIZATION) $(ARCHCPUFLAGS) $(ARCHXXINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES) -pipe
+CXXPICFLAGS = $(ARCHPICFLAGS) $(CXXFLAGS)
+CPPFLAGS = $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
+AFLAGS = $(CFLAGS) -D__ASSEMBLY__
+
+NXFLATLDFLAGS1 = -r -d -warn-common
+NXFLATLDFLAGS2 = $(NXFLATLDFLAGS1) -T$(TOPDIR)/binfmt/libnxflat/gnu-nxflat-pcrel.ld -no-check-sections
+LDNXFLATFLAGS = -e main -s 2048
+
+ASMEXT = .S
+OBJEXT = .o
+LIBEXT = .a
+EXEEXT =
+
+ifneq ($(CROSSDEV),arm-nuttx-elf-)
+  LDFLAGS += -nostartfiles -nodefaultlibs
+endif
+ifeq ($(CONFIG_DEBUG_SYMBOLS),y)
+  LDFLAGS += -g
+endif
+
+
+HOSTCC = gcc
+HOSTINCLUDES = -I.
+HOSTCFLAGS = -Wall -Wstrict-prototypes -Wshadow -Wundef -g -pipe
+HOSTLDFLAGS =
+

configs/stm32f103-minimum/veml6070/setenv.sh

@@ -0,0 +1,100 @@
+#!/bin/bash
+# configs//stm32f103-minimum/veml6070/setenv.sh
+#
+#   Copyright (C) 2016 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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.
+#
+
+# 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.
+#
+
+if [ "$_" = "$0" ] ; then
+  echo "You must source this script, not run it!" 1>&2
+  exit 1
+fi
+
+WD=`pwd`
+if [ ! -x "setenv.sh" ]; then
+  echo "This script must be executed from the top-level NuttX build directory"
+  exit 1
+fi
+
+if [ -z "${PATH_ORIG}" ]; then
+  export PATH_ORIG="${PATH}"
+fi
+
+# This is the Cygwin path to the location where I installed the CodeSourcery
+# toolchain under windows.  You will also have to edit this if you install
+# the CodeSourcery toolchain in any other location
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery G++ Lite/bin"
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
+# export TOOLCHAIN_BIN="/cygdrive/c/Users/MyName/MentorGraphics/Sourcery_CodeBench_Lite_for_ARM_EABI/bin"
+
+# This is the location where I installed the ARM "GNU Tools for ARM Embedded Processors"
+# You can this free toolchain here https://launchpad.net/gcc-arm-embedded
+export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/GNU Tools ARM Embedded/4.9 2015q2/bin"
+
+# This is the path to the location where I installed the devkitARM toolchain
+# You can get this free toolchain from http://devkitpro.org/ or http://sourceforge.net/projects/devkitpro/
+#export TOOLCHAIN_BIN="/cygdrive/c/Program Files (x86)/devkitARM/bin"
+
+# This is the Cygwin path to the location where I build the buildroot
+# toolchain.
+# export TOOLCHAIN_BIN="${WD}/../buildroot/build_arm_nofpu/staging_dir/bin"
+
+# Add the path to the toolchain to the PATH varialble
+export PATH="${TOOLCHAIN_BIN}:/sbin:/usr/sbin:${PATH_ORIG}"
+
+echo "PATH : ${PATH}"

drivers/sensors/Kconfig

@@ -234,6 +234,13 @@ config QENCODER
 	bool "Qencoder"
 	default n
 
+config VEML6070
+	bool "Vishay VEML6070 UV-A Light Sensor support"
+	default n
+	select I2C
+	---help---
+		Enable driver support for the Vishay VEML6070 UV-A light sensor.
+
 config XEN1210
 	bool "Sensixs XEN1210 Magnetometer"
 	default n

drivers/sensors/Make.defs

@@ -138,6 +138,12 @@ ifeq ($(CONFIG_QENCODER),y)
   CSRCS += qencoder.c
 endif
 
+# Vishay VEML6070
+
+ifeq ($(CONFIG_VEML6070),y)
+  CSRCS += veml6070.c
+endif
+
 # Sensixs XEN1210
 
 ifeq ($(CONFIG_XEN1210),y)

drivers/sensors/veml6070.c

@@ -0,0 +1,352 @@
+/****************************************************************************
+ * drivers/sensors/veml6070.c
+ * Character driver for the Vishay UV-A Light Sensor VEML6070
+ *
+ *   Copyright (C) 2016 Alan Carvalho de Assis. All rights reserved.
+ *   Author: Alan Carvalho de Assis <acassis@gmail.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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <debug.h>
+#include <stdlib.h>
+
+#include <nuttx/kmalloc.h>
+#include <nuttx/fs/fs.h>
+#include <nuttx/i2c/i2c_master.h>
+#include <nuttx/sensors/veml6070.h>
+
+#if defined(CONFIG_I2C) && defined(CONFIG_VEML6070)
+
+/****************************************************************************
+ * Pre-process Definitions
+ ****************************************************************************/
+
+#ifndef CONFIG_VEML6070_I2C_FREQUENCY
+#  define CONFIG_VEML6070_I2C_FREQUENCY 100000
+#endif
+
+/****************************************************************************
+ * Private Types
+ ****************************************************************************/
+
+struct veml6070_dev_s
+{
+  FAR struct i2c_master_s *i2c; /* I2C interface */
+  uint8_t addr;                 /* I2C address */
+};
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/* I2C Helpers */
+
+static int     veml6070_read8(FAR struct veml6070_dev_s *priv, int offset,
+                 FAR uint8_t *regval);
+static int     veml6070_write8(FAR struct veml6070_dev_s *priv,
+                 uint8_t regval);
+
+/* Character driver methods */
+
+static int     veml6070_open(FAR struct file *filep);
+static int     veml6070_close(FAR struct file *filep);
+static ssize_t veml6070_read(FAR struct file *filep, FAR char *buffer,
+                 size_t buflen);
+static ssize_t veml6070_write(FAR struct file *filep,
+                 FAR const char *buffer, size_t buflen);
+
+/****************************************************************************
+ * Private Data
+ ****************************************************************************/
+
+static const struct file_operations g_veml6070_fops =
+{
+  veml6070_open,   /* open */
+  veml6070_close,  /* close */
+  veml6070_read,   /* read */
+  veml6070_write,  /* write */
+  NULL,            /* seek */
+  NULL             /* ioctl */
+#ifndef CONFIG_DISABLE_POLL
+  , NULL           /* poll */
+#endif
+#ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
+  , NULL           /* unlink */
+#endif
+};
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: veml6070_read8
+ *
+ * Description:
+ *   Read 8-bit register
+ *
+ ****************************************************************************/
+
+static int veml6070_read8(FAR struct veml6070_dev_s *priv, int offset,
+                            FAR uint8_t *regval)
+{
+  struct i2c_config_s config;
+  uint8_t data[1];
+  int ret = -1;
+
+  /* Set up the I2C configuration */
+
+  config.frequency = CONFIG_VEML6070_I2C_FREQUENCY;
+  config.address   = priv->addr + offset;
+  config.addrlen   = 7;
+
+  /* Read 8-bits from the device */
+
+  ret = i2c_read(priv->i2c, &config, data, 1);
+  if (ret < 0)
+    {
+      snerr ("i2c_read failed: %d\n", ret);
+      return ret;
+    }
+
+  /* Copy the content of the buffer to the location of the uint8_t pointer */
+
+  *regval = data[0];
+
+  sninfo("value: %08x ret: %d\n", *regval, ret);
+  return OK;
+}
+
+/****************************************************************************
+ * Name: veml6070_write8
+ *
+ * Description:
+ *   Write from an 8-bit register
+ *
+ ****************************************************************************/
+
+static int veml6070_write8(FAR struct veml6070_dev_s *priv, uint8_t regval)
+{
+  struct i2c_config_s config;
+  int ret;
+
+  sninfo("value: %02x\n", regval);
+
+  /* Set up the I2C configuration */
+
+  config.frequency = CONFIG_VEML6070_I2C_FREQUENCY;
+  config.address   = priv->addr;
+  config.addrlen   = 7;
+
+  /* Write 8 bits to device */
+
+  ret = i2c_write(priv->i2c, &config, &regval, 1);
+  if (ret < 0)
+    {
+      snerr("ERROR: i2c_write failed: %d\n", ret);
+    }
+
+  return ret;
+}
+
+/****************************************************************************
+ * Name: veml6070_open
+ *
+ * Description:
+ *   This function is called whenever the VEML6070 device is opened.
+ *
+ ****************************************************************************/
+
+static int veml6070_open(FAR struct file *filep)
+{
+  return OK;
+}
+
+/****************************************************************************
+ * Name: veml6070_close
+ *
+ * Description:
+ *   This routine is called when the VEML6070 device is closed.
+ *
+ ****************************************************************************/
+
+static int veml6070_close(FAR struct file *filep)
+{
+  return OK;
+}
+
+/****************************************************************************
+ * Name: veml6070_read
+ ****************************************************************************/
+
+static ssize_t veml6070_read(FAR struct file *filep, FAR char *buffer,
+                              size_t buflen)
+{
+  int ret;
+  FAR struct inode         *inode;
+  FAR struct veml6070_dev_s *priv;
+  int msb = 1;
+  uint16_t regdata;
+
+  DEBUGASSERT(filep);
+  inode = filep->f_inode;
+
+  DEBUGASSERT(inode && inode->i_private);
+  priv  = (FAR struct veml6070_dev_s *)inode->i_private;
+
+  /* Check if the user is reading the right size */
+
+  if (buflen != 2)
+    {
+      snerr("ERROR: You need to read 2 bytes from this sensor!\n");
+      return -EINVAL;
+    }
+
+  /* Enable the sensor */
+
+  ret = veml6070_write8(priv, VEML6070_CMD_RSV & ~VEML6070_CMD_SD);
+  if (ret < 0)
+    {
+      snerr("ERROR: Failed to enable the VEML6070!\n");
+      return -EINVAL;
+    }
+
+  /* 1T for Rset 270Kohms is 125ms */
+
+  usleep(125000);
+
+  /* Read the MSB first */
+
+  ret = veml6070_read8(priv, msb, (FAR uint8_t *) &regdata);
+  if (ret < 0)
+    {
+      snerr("ERROR: Error reading light sensor!\n");
+      return ret;
+    }
+
+  buffer[1] = regdata;
+
+  /* Read the LSB */
+
+  msb = 0;
+  ret = veml6070_read8(priv, msb, (FAR uint8_t *) &regdata);
+  if (ret < 0)
+    {
+      snerr("ERROR: Error reading light sensor!\n");
+      return ret;
+    }
+
+  buffer[0] = regdata;
+
+  return buflen;
+}
+
+/****************************************************************************
+ * Name: veml6070_write
+ ****************************************************************************/
+
+static ssize_t veml6070_write(FAR struct file *filep,
+                               FAR const char *buffer, size_t buflen)
+{
+  return -ENOSYS;
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: veml6070_register
+ *
+ * Description:
+ *   Register the VEML6070 character device as 'devpath'
+ *
+ * Input Parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/uvlight0"
+ *   i2c - An instance of the I2C interface to use to communicate with VEML6070
+ *   addr - The I2C address of the VEML6070.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int veml6070_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
+                       uint8_t addr)
+{
+  int ret;
+
+  /* Sanity check */
+
+  DEBUGASSERT(i2c != NULL);
+
+  /* Initialize the VEML6070 device structure */
+
+  FAR struct veml6070_dev_s *priv =
+    (FAR struct veml6070_dev_s *)kmm_malloc(sizeof(struct veml6070_dev_s));
+
+  if (priv == NULL)
+    {
+      snerr("ERROR: Failed to allocate instance\n");
+      return -ENOMEM;
+    }
+
+  priv->i2c  = i2c;
+  priv->addr = addr;
+
+  /* Initialize the device (shut it down) */
+
+  ret = veml6070_write8(priv, VEML6070_CMD_RSV | VEML6070_CMD_SD);
+  if (ret < 0)
+    {
+      snerr("ERROR: Failed to initialize the VEML6070!\n");
+      return ret;
+    }
+
+  /* Register the character driver */
+
+  ret = register_driver(devpath, &g_veml6070_fops, 0666, priv);
+  if (ret < 0)
+    {
+      snerr("ERROR: Failed to register driver: %d\n", ret);
+      kmm_free(priv);
+    }
+
+  return ret;
+}
+
+#endif /* CONFIG_I2C && CONFIG_VEML6070 */

include/nuttx/sensors/veml6070.h

@@ -0,0 +1,121 @@
+/****************************************************************************
+ * include/nuttx/input/veml6070.h
+ *
+ *   Copyright (C) 2015-2016 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2016 Alan Carvalho de Assis. All rights reserved.
+ *   Author: Alan Carvalho de Assis <acassis@gmail.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_VEML6070_H
+#define __INCLUDE_NUTTX_SENSORS_VEML6070_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+#include <nuttx/irq.h>
+#include <nuttx/sensors/ioctl.h>
+
+#if defined(CONFIG_VEML6070)
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+/* Device I2C Address */
+
+#define VEML6070_I2C_DATA_LSB_CMD_ADDR  0x38
+#define VEML6070_I2C_DATA_MSB_ADDR      0x39
+
+/* Command Register Format
+ * Bits:
+ *  7  |  6  |  5  |    4    |  3  |  2  |  1  |  0 |
+ * RSV | RSV | ACK | ACK_THD | IT1 | IT0 | RSV | SD |
+ *
+ * NOTE: The RSV Bit 1 needs to be always 1
+ */
+
+
+#define VEML6070_CMD_SD           0x01 /* Shutdown command */
+#define VEML6070_CMD_RSV          0x02
+#define VEML6070_CMD_IT_0_5T      0x00 /* IT1=0 : IT0=0 */
+#define VEML6070_CMD_IT_1T        0x04 /* IT1=0 : IT0=1 */
+#define VEML6070_CMD_IT_2T        0x08 /* IT1=1 : IT0=0 */
+#define VEML6070_CMD_IT_4T        0x0c /* IT1=1 : IT0=1 */
+#define VEML6070_CMD_ACK_THD      0x10 /* Acknowledge thresold:
+                                          0 = 102 steps
+                                          1 = 145 steps */
+#define VEML6070_CMD_ACK          0x20 /* Acknowledge activity */
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: veml6070_register
+ *
+ * Description:
+ *   Register the VEML6070 character device as 'devpath'
+ *
+ * Input Parameters:
+ *   devpath - The full path to the driver to register. E.g., "/dev/uvlight0"
+ *   i2c     - An instance of the I2C interface to use to communicate with
+ *              VEML6070
+ *   addr    - The I2C address of the VEML6070.
+ *
+ * Returned Value:
+ *   Zero (OK) on success; a negated errno value on failure.
+ *
+ ****************************************************************************/
+
+int veml6070_register(FAR const char *devpath, FAR struct i2c_master_s *i2c,
+                       uint8_t addr);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_VEML6070 */
+#endif /* __INCLUDE_NUTTX_SENSORS_VEML6070_H */