--- /dev/null
+/****************************************************************************
+ * extdrv/veml6070_uv_sensor.c
+ *
+ * VEML6070 I2C UV sensor driver
+ *
+ * Copyright 2016 Nathael Pajani <nathael.pajani@ed3l.fr>
+ *
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *************************************************************************** */
+
+
+#include "lib/stdint.h"
+#include "lib/errno.h"
+#include "core/system.h"
+#include "drivers/i2c.h"
+#include "extdrv/veml6070_uv_sensor.h"
+
+
+
+/* Check the sensor presence, return 1 if found */
+int veml6070_probe_sensor(struct veml6070_sensor_config* conf)
+{
+ char cmd_buf = (conf->addr | I2C_READ_BIT);
+
+ /* Did we already probe the sensor ? */
+ if (conf->probe_ok != 1) {
+ conf->probe_ok = i2c_read(conf->bus_num, &cmd_buf, 1, NULL, NULL, 0);
+ }
+ return conf->probe_ok;
+}
+
+/* UV Read
+ * Performs a read of the uv data from the sensor.
+ * 'uv_raw': integer addresses for conversion result.
+ * Return value(s):
+ * Upon successfull completion, returns 0 and the luminosity read is placed in the
+ * provided integer(s). On error, returns a negative integer equivalent to errors from
+ * glibc.
+ * -EBADFD : I2C not initialized
+ * -EBUSY : Device or ressource Busy or Arbitration lost
+ * -EINVAL : Invalid argument (buf)
+ * -ENODEV : No such device
+ * -EREMOTEIO : Device did not acknowledge : Any device present ?
+ * -EIO : Bad one: Illegal start or stop, or illegal state in i2c state machine
+ */
+int veml6070_sensor_read(struct veml6070_sensor_config* conf, uint16_t* uv_raw)
+{
+ int ret = 0;
+ char cmd_buf =0;
+ uint8_t data = 0;
+
+ if (veml6070_probe_sensor(conf) != 1) {
+ return -ENODEV;
+ }
+ if (uv_raw == NULL) {
+ return -EINVAL;
+ }
+
+ /* Start by reading MSB */
+ cmd_buf = ((conf->addr + 2) | I2C_READ_BIT);
+ ret = i2c_read(conf->bus_num, &cmd_buf, 1, NULL, &data, 1);
+ if (ret != 1) {
+ return ret;
+ }
+ *uv_raw = ((uint16_t)data << 8) & 0xFF00;
+ msleep(1);
+ /* And read LSB */
+ cmd_buf = (conf->addr | I2C_READ_BIT);
+ ret = i2c_read(conf->bus_num, &cmd_buf, 1, NULL, &data, 1);
+ if (ret != 1) {
+ return ret;
+ }
+ *uv_raw |= (uint16_t)data & 0x00FF;
+
+ return 0;
+}
+
+
+/* Sensor config
+ * Performs default configuration of the UV sensor.
+ * Return value:
+ * Upon successfull completion, returns 0. On error, returns a negative integer
+ * equivalent to errors from glibc.
+ * -EBADFD : I2C not initialized
+ * -EBUSY : Device or ressource Busy or Arbitration lost
+ * -EINVAL : Invalid argument (buf)
+ * -ENODEV : No such device
+ * -EREMOTEIO : Device did not acknowledge : Any device present ?
+ * -EIO : Bad one: Illegal start or stop, or illegal state in i2c state machine
+ */
+#define CONF_BUF_SIZE 2
+int veml6070_configure(struct veml6070_sensor_config* conf)
+{
+ int ret = 0;
+ char cmd_buf[CONF_BUF_SIZE] = { conf->addr, (VEML6070_NO_ACK | VEML6070_INTEG_1T | VEML6070_ENABLE), };
+
+ if (veml6070_probe_sensor(conf) != 1) {
+ return -ENODEV;
+ }
+ msleep(1);
+ ret = i2c_write(conf->bus_num, cmd_buf, CONF_BUF_SIZE, NULL);
+ if (ret != CONF_BUF_SIZE) {
+ return -EIO;
+ }
+ return 0;
+}
+
+
+
+
--- /dev/null
+/****************************************************************************
+ * extdrv/veml6070_uv_sensor.h
+ *
+ * VEML6070 I2C UV sensor driver
+ *
+ * Copyright 2016 Nathael Pajani <nathael.pajani@ed3l.fr>
+ *
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ *************************************************************************** */
+
+
+#include "lib/stdint.h"
+
+
+
+/* VEML6070 sensor instance data.
+ * Note that the veml6070 sensor adress cannot be changed.
+ */
+struct veml6070_sensor_config {
+ uint8_t addr;
+ uint8_t bus_num;
+ uint8_t probe_ok;
+ uint8_t actual_config;
+};
+
+
+/* Defines for command byte */
+#define VEML6070_ACK (1 << 5)
+#define VEML6070_ACK_THD_102 (0)
+#define VEML6070_ACK_THD_145 (1 << 4)
+#define VEML6070_NO_ACK (0)
+#define VEML6070_INTEG_05T (0x00 << 2)
+#define VEML6070_INTEG_1T (0x01 << 2)
+#define VEML6070_INTEG_2T (0x02 << 2)
+#define VEML6070_INTEG_4T (0x03 << 2)
+#define VEML6070_ENABLE (1 << 0)
+
+
+/* Check the sensor presence, return 1 if foundZ */
+int veml6070_probe_sensor(struct veml6070_sensor_config* conf);
+
+
+/* UV Read
+ * Performs a read of the uv data from the sensor.
+ * 'uv_raw': integer addresses for conversion result.
+ * Return value(s):
+ * Upon successfull completion, returns 0 and the luminosity read is placed in the
+ * provided integer(s). On error, returns a negative integer equivalent to errors from
+ * glibc.
+ * -EBADFD : I2C not initialized
+ * -EBUSY : Device or ressource Busy or Arbitration lost
+ * -EINVAL : Invalid argument (buf)
+ * -ENODEV : No such device
+ * -EREMOTEIO : Device did not acknowledge : Any device present ?
+ * -EIO : Bad one: Illegal start or stop, or illegal state in i2c state machine
+ */
+int veml6070_sensor_read(struct veml6070_sensor_config* conf, uint16_t* uv_raw);
+
+
+/* Sensor config
+ * Performs default configuration of the UV sensor.
+ * Return value:
+ * Upon successfull completion, returns 0. On error, returns a negative integer
+ * equivalent to errors from glibc.
+ * -EBADFD : I2C not initialized
+ * -EBUSY : Device or ressource Busy or Arbitration lost
+ * -EINVAL : Invalid argument (buf)
+ * -ENODEV : No such device
+ * -EREMOTEIO : Device did not acknowledge : Any device present ?
+ * -EIO : Bad one: Illegal start or stop, or illegal state in i2c state machine
+ */
+#define CONF_BUF_SIZE 2
+int veml6070_configure(struct veml6070_sensor_config* conf);
+
+
