diff --git a/src/ipa/rpi/cam_helper/cam_helper_imx678.cpp b/src/ipa/rpi/cam_helper/cam_helper_imx678.cpp
new file mode 100644
index 000000000..916433bf6
--- /dev/null
+++ b/src/ipa/rpi/cam_helper/cam_helper_imx678.cpp
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2026, Will Whang
+ *
+ * cam_helper_imx678.cpp - camera information for Sony IMX678 sensor
+ */
+
+#include <algorithm>
+#include <cmath>
+
+#include "cam_helper.h"
+
+using namespace RPiController;
+
+class CamHelperImx678 : public CamHelper
+{
+public:
+	CamHelperImx678();
+	uint32_t gainCode(double gain) const override;
+	double gain(uint32_t gainCode) const override;
+
+private:
+	/*
+	 * Smallest difference between the frame length and integration time,
+	 * in units of lines.
+	 */
+	static constexpr int frameIntegrationDiff = 4;
+};
+
+/*
+ * IMX678 driver currently doesn't expose a metadata stream, so we have to use
+ * the "unicam parser" which works by counting frames.
+ */
+
+CamHelperImx678::CamHelperImx678()
+	: CamHelper({}, frameIntegrationDiff)
+{
+}
+
+uint32_t CamHelperImx678::gainCode(double gain) const
+{
+	int code = 66.6667 * log10(gain);
+	return std::max(0, std::min(code, 0xf0));
+}
+
+double CamHelperImx678::gain(uint32_t gainCode) const
+{
+	return std::pow(10, 0.015 * gainCode);
+}
+
+static CamHelper *create()
+{
+	return new CamHelperImx678();
+}
+
+static RegisterCamHelper reg("imx678", &create);
diff --git a/src/ipa/rpi/cam_helper/meson.build b/src/ipa/rpi/cam_helper/meson.build
index 87b6a3600..eabd55dce 100644
--- a/src/ipa/rpi/cam_helper/meson.build
+++ b/src/ipa/rpi/cam_helper/meson.build
@@ -10,6 +10,7 @@ rpi_ipa_cam_helper_sources = files([
     'cam_helper_imx415.cpp',
     'cam_helper_imx477.cpp',
     'cam_helper_imx519.cpp',
+    'cam_helper_imx678.cpp',
     'cam_helper_imx708.cpp',
     'cam_helper_ov64a40.cpp',
     'cam_helper_ov7251.cpp',