libcamera: libipa: camera_sensor: Add Himax HM1246 sensor properties

Provide the Himax HM1246 camera sensor properties and registration with
libipa for the gain code helpers.

Signed-off-by: Matthias Fend <matthias.fend@emfend.at>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/ipa/libipa/camera_sensor_helper.cpp

@@ -497,6 +497,16 @@ public:
 };
 REGISTER_CAMERA_SENSOR_HELPER("gc08a3", CameraSensorHelperGc08a3)
 
+class CameraSensorHelperHm1246 : public CameraSensorHelper
+{
+public:
+	CameraSensorHelperHm1246()
+	{
+		gain_ = AnalogueGainLinear{ 1, 16, 0, 16 };
+	}
+};
+REGISTER_CAMERA_SENSOR_HELPER("hm1246", CameraSensorHelperHm1246)
+
 class CameraSensorHelperImx214 : public CameraSensorHelper
 {
 public:

src/libcamera/sensor/camera_sensor_properties.cpp

@@ -151,6 +151,38 @@ const CameraSensorProperties *CameraSensorProperties::get(const std::string &sen
 			},
 			.sensorDelays = { },
 		} },
+		{ "hm1246", {
+			.unitCellSize = { 3000, 3000 },
+			.testPatternModes =  {
+				{ controls::draft::TestPatternModeOff, 0 },
+				/* Solid white. */
+				{ controls::draft::TestPatternModeSolidColor, 6 },
+				/* The six vertical bars (left-to-right) are as follows: black,
+				 * blue, red, magenta, green and cyan.
+				 */
+				{ controls::draft::TestPatternModeCustom1, 5 },
+				/*
+				 * No corresponding test pattern mode for:
+				 *  1: "Checkboard"
+				 *  2: "Ramp"
+				 *  3: "Moving ones"
+				 *  4: "Blending color bars"
+				 *  7: "Solid black"
+				 *  8: "Solid red"
+				 *  9: "Solid green"
+				 * 10: "Solid blue"
+				 *
+				 * Even though the sensor supports color bars and faded color bars as test patterns, these are
+				 * not offered because these patterns do not meet the expected properties.
+				 */
+			},
+			.sensorDelays = {
+				.exposureDelay = 2,
+				.gainDelay = 2,
+				.vblankDelay = 2,
+				.hblankDelay = 2
+			},
+		} },
 		{ "imx214", {
 			.unitCellSize = { 1120, 1120 },
 			.testPatternModes = {