ipa: rpi: Add "focus" algorithm

Adds FocusStatus to the image metadata, containing contrast measurements
across the image. Optionally also prints a contrast measure to the
console, to aid in manual adjustment of the lens. Note that it is not an
actual auto-focus algorithm that can drive a lens!

Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/controller/focus_status.h b/src/ipa/raspberrypi/controller/focus_status.h
new file mode 100644
index 00000000..3ad88777
--- /dev/null
+++ b/src/ipa/raspberrypi/controller/focus_status.h
@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2020, Raspberry Pi (Trading) Limited
+ *
+ * focus_status.h - focus measurement status
+ */
+#pragma once
+
+#include <linux/bcm2835-isp.h>
+
+// The focus algorithm should post the following structure into the image's
+// "focus.status" metadata. Recall that it's only reporting focus (contrast)
+// measurements, it's not driving any kind of auto-focus algorithm!
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct FocusStatus {
+	int num;
+	uint32_t focus_measures[FOCUS_REGIONS];
+};
+
+#ifdef __cplusplus
+}
+#endif