ipa: rpi: Add tuning files for OV7251

OV7251 is a mono VGA global shutter sensor that has a mainline
driver and works with libcamera.
Add the supporting files for it. The tuning is copied from OV9281.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Naushir Patuck <naush@raspberrypi.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

4 files changed, 204 insertions, 0 deletions

diff --git a/src/ipa/rpi/cam_helper/cam_helper_ov7251.cpp b/src/ipa/rpi/cam_helper/cam_helper_ov7251.cpp
new file mode 100644
index 00000000..7b12c445
--- /dev/null
+++ b/src/ipa/rpi/cam_helper/cam_helper_ov7251.cpp
@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2021, Raspberry Pi Ltd
+ *
+ * camera information for ov7251 sensor
+ */
+
+#include <assert.h>
+
+#include "cam_helper.h"
+
+using namespace RPiController;
+
+class CamHelperOv7251 : public CamHelper
+{
+public:
+	CamHelperOv7251();
+	uint32_t gainCode(double gain) const override;
+	double gain(uint32_t gainCode) const override;
+	void getDelays(int &exposureDelay, int &gainDelay,
+		       int &vblankDelay, int &hblankDelay) const override;
+
+private:
+	/*
+	 * Smallest difference between the frame length and integration time,
+	 * in units of lines.
+	 */
+	static constexpr int frameIntegrationDiff = 4;
+};
+
+/*
+ * OV7251 doesn't output metadata, so we have to use the "unicam parser" which
+ * works by counting frames.
+ */
+
+CamHelperOv7251::CamHelperOv7251()
+	: CamHelper({}, frameIntegrationDiff)
+{
+}
+
+uint32_t CamHelperOv7251::gainCode(double gain) const
+{
+	return static_cast<uint32_t>(gain * 16.0);
+}
+
+double CamHelperOv7251::gain(uint32_t gainCode) const
+{
+	return static_cast<double>(gainCode) / 16.0;
+}
+
+void CamHelperOv7251::getDelays(int &exposureDelay, int &gainDelay,
+				int &vblankDelay, int &hblankDelay) const
+{
+	/* The driver appears to behave as follows: */
+	exposureDelay = 2;
+	gainDelay = 2;
+	vblankDelay = 2;
+	hblankDelay = 2;
+}
+
+static CamHelper *create()
+{
+	return new CamHelperOv7251();
+}
+
+static RegisterCamHelper reg("ov7251", &create);
diff --git a/src/ipa/rpi/cam_helper/meson.build b/src/ipa/rpi/cam_helper/meson.build
index 1e43f1da..03e88fe0 100644
--- a/src/ipa/rpi/cam_helper/meson.build
+++ b/src/ipa/rpi/cam_helper/meson.build
@@ -11,6 +11,7 @@ rpi_ipa_cam_helper_sources = files([
     'cam_helper_imx519.cpp',
     'cam_helper_imx708.cpp',
     'cam_helper_ov64a40.cpp',
+    'cam_helper_ov7251.cpp',
     'cam_helper_ov9281.cpp',
     'md_parser_smia.cpp',
 ])
diff --git a/src/ipa/rpi/vc4/data/meson.build b/src/ipa/rpi/vc4/data/meson.build
index 60477c11..8c34a1a5 100644
--- a/src/ipa/rpi/vc4/data/meson.build
+++ b/src/ipa/rpi/vc4/data/meson.build
@@ -19,6 +19,7 @@ conf_files = files([
     'ov5647.json',
     'ov5647_noir.json',
     'ov64a40.json',
+    'ov7251_mono.json',
     'ov9281_mono.json',
     'se327m12.json',
     'uncalibrated.json',
diff --git a/src/ipa/rpi/vc4/data/ov7251_mono.json b/src/ipa/rpi/vc4/data/ov7251_mono.json
new file mode 100644
index 00000000..a9d05a01
--- /dev/null
+++ b/src/ipa/rpi/vc4/data/ov7251_mono.json
@@ -0,0 +1,136 @@
+{
+    "version": 2.0,
+    "target": "bcm2835",
+    "algorithms": [
+        {
+            "rpi.black_level":
+            {
+                "black_level": 4096
+            }
+        },
+        {
+            "rpi.lux":
+            {
+                "reference_shutter_speed": 2000,
+                "reference_gain": 1.0,
+                "reference_aperture": 1.0,
+                "reference_lux": 800,
+                "reference_Y": 20000
+            }
+        },
+        {
+            "rpi.noise":
+            {
+                "reference_constant": 0,
+                "reference_slope": 2.5
+            }
+        },
+        {
+            "rpi.sdn": { }
+        },
+        {
+            "rpi.agc":
+            {
+                "metering_modes":
+                {
+                    "centre-weighted":
+                    {
+                        "weights":
+                        [
+                            4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0
+                        ]
+                    }
+                },
+                "exposure_modes":
+                {
+                    "normal":
+                    {
+                        "shutter": [ 100, 15000, 30000, 60000, 120000 ],
+                        "gain": [ 1.0, 2.0, 3.0, 4.0, 8.0 ]
+                    },
+                    "short":
+                    {
+                        "shutter": [ 100, 5000, 10000, 20000, 30000 ],
+                        "gain": [ 1.0, 2.0, 4.0, 6.0, 8.0 ]
+                    },
+                    "long":
+                    {
+                        "shutter": [ 1000, 30000, 60000, 90000, 120000 ],
+                        "gain": [ 1.0, 2.0, 4.0, 6.0, 12.0 ]
+                    }
+                },
+                "constraint_modes":
+                {
+                    "normal": [
+                        {
+                            "bound": "LOWER",
+                            "q_lo": 0.98,
+                            "q_hi": 1.0,
+                            "y_target":
+                            [
+                                0, 0.4,
+                                1000, 0.4
+                            ]
+                        }
+                    ]
+                },
+                "y_target":
+                [
+                    0, 0.16,
+                    1000, 0.165,
+                    10000, 0.17
+                ]
+            }
+        },
+        {
+            "rpi.alsc":
+            {
+                "n_iter": 0,
+                "luminance_strength": 1.0,
+                "corner_strength": 1.5
+            }
+        },
+        {
+            "rpi.contrast":
+            {
+                "ce_enable": 0,
+                "gamma_curve":
+                [
+                    0, 0,
+                    1024, 5040,
+                    2048, 9338,
+                    3072, 12356,
+                    4096, 15312,
+                    5120, 18051,
+                    6144, 20790,
+                    7168, 23193,
+                    8192, 25744,
+                    9216, 27942,
+                    10240, 30035,
+                    11264, 32005,
+                    12288, 33975,
+                    13312, 35815,
+                    14336, 37600,
+                    15360, 39168,
+                    16384, 40642,
+                    18432, 43379,
+                    20480, 45749,
+                    22528, 47753,
+                    24576, 49621,
+                    26624, 51253,
+                    28672, 52698,
+                    30720, 53796,
+                    32768, 54876,
+                    36864, 57012,
+                    40960, 58656,
+                    45056, 59954,
+                    49152, 61183,
+                    53248, 62355,
+                    57344, 63419,
+                    61440, 64476,
+                    65535, 65535
+                ]
+            }
+        }
+    ]
+}
\ No newline at end of file