diff --git a/backend/genesys_gl843.cc b/backend/genesys_gl843.cc
index 81263039b..63796cf1f 100644
--- a/backend/genesys_gl843.cc
+++ b/backend/genesys_gl843.cc
@@ -2860,6 +2860,10 @@ static void gl843_offset_calibration(Genesys_Device* dev, const Genesys_Sensor&
                                      Genesys_Register_Set& regs)
 {
     DBG_HELPER(dbg);
+
+    if (dev->frontend.layout.type == FrontendType::UNKNOWN)
+        return;
+
   unsigned int channels, bpp;
   int pass, total_size, i, resolution, lines;
   int topavg[3], bottomavg[3], avg[3];
@@ -3091,6 +3095,9 @@ static void gl843_coarse_gain_calibration(Genesys_Device* dev, const Genesys_Sen
   int resolution;
   int bpp;
 
+    if (dev->frontend.layout.type == FrontendType::UNKNOWN)
+        return;
+
     dpihw = sensor.get_logical_hwdpi(dpi);
   factor=sensor.optical_res/dpihw;
 
diff --git a/backend/genesys_sensor.h b/backend/genesys_sensor.h
index 6717064a7..65c6464ba 100644
--- a/backend/genesys_sensor.h
+++ b/backend/genesys_sensor.h
@@ -65,14 +65,24 @@ struct AssignableArray : public std::array<T, Size> {
     }
 };
 
+enum class FrontendType : unsigned
+{
+    UNKNOWN,
+    WOLFSON,
+    ANALOG_DEVICES
+};
+
 struct GenesysFrontendLayout
 {
+    FrontendType type = FrontendType::UNKNOWN;
     std::array<uint16_t, 3> offset_addr = {};
     std::array<uint16_t, 3> gain_addr = {};
 
     bool operator==(const GenesysFrontendLayout& other) const
     {
-        return offset_addr == other.offset_addr && gain_addr == other.gain_addr;
+        return type == other.type &&
+                offset_addr == other.offset_addr &&
+                gain_addr == other.gain_addr;
     }
 };
 
diff --git a/backend/genesys_tables_frontend.cc b/backend/genesys_tables_frontend.cc
index 7f7c63557..c5bbf6bfa 100644
--- a/backend/genesys_tables_frontend.cc
+++ b/backend/genesys_tables_frontend.cc
@@ -52,6 +52,7 @@ void genesys_init_frontend_tables()
     s_frontends.init();
 
     GenesysFrontendLayout wolfson_layout;
+    wolfson_layout.type = FrontendType::WOLFSON;
     wolfson_layout.offset_addr = { 0x20, 0x21, 0x22 };
     wolfson_layout.gain_addr = { 0x28, 0x29, 0x2a };