VEML6070: Initial Commit

This commit provides a basic driver for the Vishay VEML6070 UV
Sensor. Some functionality might be missing. Binding examples have
not been tested as of now.

Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>

src/veml6070/veml6070.h

@@ -0,0 +1,99 @@
+/*
+ * Author: Abhishek Malik <abhishek.malik@intel.com>
+ * Copyright (c) 2017 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#pragma once
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "upm.h"
+#include "mraa/i2c.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define VEML6070_CTRL_REG             0x38    // write only
+#define VEML6070_SEQ1_DATA_BUF_REG    0x39    // read only
+#define VEML6070_SEQ2_DATA_BUF_REG    0x38    // read only
+
+typedef enum {
+    HALF_T = 0,
+    ONE_T,
+    TWO_T,
+    FOUR_T } veml6070_integration_time_t;
+
+/**
+ * @file veml6070.h
+ * @library veml6070
+ * @brief C API for the VEML6070 Vishay UV Sensor
+ *
+ * @include veml6070.c
+ */
+
+typedef struct _veml6070_context {
+    mraa_i2c_context       i2c;
+    uint8_t                address;
+    uint8_t                i2c_bus_number;
+} *veml6070_context;
+
+/**
+ * VEML6070 Initialization function
+ *
+ * @param bus I2C bus to use
+ * @param address I2C address to use
+ *
+ * @return device context pointer
+ */
+veml6070_context veml6070_init(uint8_t bus, uint8_t address);
+
+/**
+ * VEML6070 Close function
+ *
+ * @param dev veml6070_context pointer
+ */
+void veml6070_close(veml6070_context dev);
+
+/**
+ * Function to get the UV values
+ *
+ * @param dev veml6070_context pointer
+ * @return int16_t UV value
+ */
+int16_t veml6070_get_uv_intensity(veml6070_context dev);
+
+/**
+ * Function to set the integration time of the sensor
+ * 
+ * @param dev veml6070_context pointer
+ * @param time veml6070_integration_time_t
+ *
+ * @return upm_result_t
+ */
+upm_result_t veml6070_set_integration_time(veml6070_context dev, veml6070_integration_time_t time);
+
+#ifdef __cplusplus
+}
+#endif