drivers: sensor: add ti tmp108 driver support

Adding support for the TI TMP108 temperature sensor. This includes
over/under temp interrupt support as well as one shot, continuous
conversion and power down modes.

Signed-off-by: Jimmy Johnson <catch22@fastmail.net>

include/drivers/sensor/tmp108.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2021, Jimmy Johnson <catch22@fastmail.net>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/**
+ * @file
+ * @brief Extended public API for TI's TMP108 temperature sensor
+ *
+ * This exposes attributes for the TMP108 which can be used for
+ * setting the on-chip Temperature Mode and alert parameters.
+ */
+
+#ifndef ZEPHYR_INCLUDE_DRIVERS_SENSOR_TMP108_H_
+#define ZEPHYR_INCLUDE_DRIVERS_SENSOR_TMP108_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum sensor_attribute_tmp_108 {
+	/** Turn on power saving/one shot mode */
+	SENSOR_ATTR_TMP108_ONE_SHOT_MODE = SENSOR_ATTR_PRIV_START,
+	/** Shutdown the sensor */
+	SENSOR_ATTR_TMP108_SHUTDOWN_MODE,
+	/** Turn on continuous conversion */
+	SENSOR_ATTR_TMP108_CONTINUOUS_CONVERSION_MODE,
+	/** Set the alert pin polarity */
+	SENSOR_ATTR_TMP108_ALERT_POLARITY
+};
+
+/** a mask for the over temp alert bit in the status word*/
+#define OVER_TEMP_MASK 0x1000U
+
+/** a mask for the under temp alert bit in the status word*/
+#define UNDER_TEMP_MASK	0x0800U
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ZEPHYR_INCLUDE_DRIVERS_SENSOR_TMP108_H_ */