diff --git a/sysmoOCTSIM/ncn8025.h b/sysmoOCTSIM/ncn8025.h
new file mode 100644
index 0000000..a392c5d
--- /dev/null
+++ b/sysmoOCTSIM/ncn8025.h
@@ -0,0 +1,28 @@
+#pragma once
+#include <stdbool.h>
+
+enum ncn8025_sim_voltage {
+	SIM_VOLT_3V0 = 0,
+	SIM_VOLT_5V0 = 2,
+	SIM_VOLT_1V8 = 3
+};
+
+enum ncn8025_sim_clkdiv {
+	SIM_CLKDIV_1 = 1,
+	SIM_CLKDIV_2 = 3,
+	SIM_CLKDIV_4 = 2,
+	SIM_CLKDIV_8 = 0,
+};
+
+struct ncn8025_settings {
+	bool rstin;	/* high: active */
+	bool cmdvcc;	/* high: active */
+	bool simpres;	/* high: active */
+	bool led;	/* high: active */
+	enum ncn8025_sim_clkdiv clkdiv;	/* raw 2bit value */
+	enum ncn8025_sim_voltage vsel;	/* raw 2bit value */
+};
+
+int ncn8025_set(uint8_t slot, const struct ncn8025_settings *set);
+int ncn8025_get(uint8_t slot, struct ncn8025_settings *set);
+int ncn8025_init(unsigned int slot);