ipa: raspberrypi: Add autofocus algorithm interface headers

Add a new AfAlgorithm class that defines the interface for the Raspberry Pi
autofocus algorithm.

Add an AfStatus structure that returns the results of the autofocus algorithm
back to the IPA.

Add a structure for PDAF statistics provided by supported sensors for use with
an autofocus algorithm. This structure is currently based on the IMX708's PDAF
"Type 1" statistics.

Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com>
Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/src/ipa/raspberrypi/controller/pdaf_data.h b/src/ipa/raspberrypi/controller/pdaf_data.h
new file mode 100644
index 00000000..03c00d72
--- /dev/null
+++ b/src/ipa/raspberrypi/controller/pdaf_data.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2022, Raspberry Pi Ltd
+ *
+ * pdaf_data.h - PDAF Metadata; for now this is
+ * largely based on IMX708's PDAF "Type 1" output.
+ */
+#pragma once
+
+#include <stdint.h>
+
+#define PDAF_DATA_ROWS 12
+#define PDAF_DATA_COLS 16
+
+struct PdafData {
+	/* Confidence values, in raster order, in arbitrary units */
+	uint16_t conf[PDAF_DATA_ROWS][PDAF_DATA_COLS];
+
+	/* Phase error, in raster order, in s11 Q4 format (S.6.4) */
+	int16_t phase[PDAF_DATA_ROWS][PDAF_DATA_COLS];
+};