Adding VEML6070 I2C UV sensor driver ... C file (commited only header in commit dd5c7...

diff --git a/extdrv/veml6070_uv_sensor.c b/extdrv/veml6070_uv_sensor.c
new file mode 100644 (file)
index 0000000..dc9da17
--- /dev/null
+++ b/extdrv/veml6070_uv_sensor.c
@@ -0,0 +1,117 @@
+/****************************************************************************
+ *   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 "core/system.h"
+#include "lib/errno.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);
+       uint8_t dropped;
+
+    /* Did we already probe the sensor ? */
+    if (conf->probe_ok != 1) {
+        conf->probe_ok = i2c_read(conf->bus_num, &cmd_buf, 1, NULL, &dropped, 1);
+    }
+    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.
+ */
+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 (conf->probe_ok != 1) {
+           if (veml6070_probe_sensor(conf) != 1) {
+                       return -ENODEV;
+           }
+               msleep(1);
+       }
+    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) {
+               conf->probe_ok = 0;
+        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) {
+               conf->probe_ok = 0;
+        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.
+ */
+#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) {
+               conf->probe_ok = 0;
+        return -EIO;
+    }
+    return 0;
+}
+
+
+
+