ipa: rkisp1: Add AF algorithm basing on common AfHillClimbing class

Rockchip ISP AF block allows calculation of sharpness and luminance
in up to three user defined windows. If no windows are set, there are
some default settings applied for the first window and exposed through
the driver. For each frame, use the sharpness value calculated for this
default window and feed the hill climbing algorithm with them. Then set
the lens position to value calculated by the algorithm.

Signed-off-by: Daniel Semkowicz <dse@thaumatec.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/ipa/rkisp1/algorithms/af.h b/src/ipa/rkisp1/algorithms/af.h
new file mode 100644
index 00000000..e9afbb98
--- /dev/null
+++ b/src/ipa/rkisp1/algorithms/af.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2022, Theobroma Systems
+ *
+ * af.h - RkISP1 AF hill climbing based control algorithm
+ */
+
+#pragma once
+
+#include <linux/rkisp1-config.h>
+
+#include "libipa/algorithms/af_hill_climbing.h"
+#include "module.h"
+
+namespace libcamera::ipa::rkisp1::algorithms {
+
+class Af : public ipa::common::algorithms::AfHillClimbing<Module>
+{
+public:
+	Af() = default;
+	~Af() = default;
+
+	int configure(IPAContext &context, const IPACameraSensorInfo &configInfo) override;
+	void prepare(IPAContext &context, rkisp1_params_cfg *params) override;
+	void process(IPAContext &context, IPAFrameContext *frameCtx,
+		     const rkisp1_stat_buffer *stats) override;
+
+	void setMetering(controls::AfMeteringEnum metering) override;
+	void setWindows(Span<const Rectangle> windows) override;
+};
+
+} /* namespace libcamera::ipa::rkisp1::algorithms */