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diff --git a/src/ipa/raspberrypi/controller/device_status.h b/src/ipa/raspberrypi/controller/device_status.h
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * device_status.h - device (image sensor) status
+ */
+#pragma once
+
+// Definition of "device metadata" which stores things like shutter time and
+// analogue gain that downstream control algorithms will want to know.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct DeviceStatus {
+ // time shutter is open, in microseconds
+ double shutter_speed;
+ double analogue_gain;
+ // 1.0/distance-in-metres, or 0 if unknown
+ double lens_position;
+ // 1/f so that brightness quadruples when this doubles, or 0 if unknown
+ double aperture;
+ // proportional to brightness with 0 = no flash, 1 = maximum flash
+ double flash_intensity;
+};
+
+#ifdef __cplusplus
+}
+#endif