diff --git a/src/core/hle/service/i2c/i2c.cpp b/src/core/hle/service/i2c/i2c.cpp
index 99decb37f9..d000487246 100644
--- a/src/core/hle/service/i2c/i2c.cpp
+++ b/src/core/hle/service/i2c/i2c.cpp
@@ -5,23 +5,66 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
 
 #include "core/core.h"
+#include "core/hle/result.h"
 #include "core/hle/service/i2c/i2c.h"
 #include "core/hle/service/ipc_helpers.h"
+#include "core/hle/service/cmif_serialization.h"
+#include "core/hle/service/cmif_types.h"
 #include "core/hle/service/service.h"
+#include "core/hle/service/server_manager.h"
 
 namespace Service::I2C {
 
+class I2CSession final : public ServiceFramework<I2CSession> {
+public:
+    explicit I2CSession(Core::System& system_)
+        : ServiceFramework{system_, "I2CSession"}
+    {
+        static const FunctionInfo functions[] = {
+            {0, nullptr, "SendOld"},
+            {1, nullptr, "ReceiveOld"},
+            {2, nullptr, "ExecuteCommandListOld"},
+            {10, C<&I2CSession::Send>, "Send"},
+            {11, nullptr, "Receive"},
+            {12, nullptr, "ExecuteCommandList"},
+            {13, nullptr, "SetRetryPolicy"},
+        };
+        RegisterHandlers(functions);
+    }
+    ~I2CSession() override = default;
+
+    Result Send(InBuffer<BufferAttr_HipcMapAlias> in_data, u32 transaction_option) {
+        LOG_WARNING(Service, "(stubbed) topt={}", transaction_option);
+        R_THROW(ResultUnknown);
+    }
+};
+
+enum class I2CDevice : u32 {
+    ClassicController,
+    Ftm3bd56,
+};
+
 class I2C final : public ServiceFramework<I2C> {
 public:
     explicit I2C(Core::System& system_)
         : ServiceFramework{system_, "i2c"}
     {
         static const FunctionInfo functions[] = {
-            {0, nullptr, "Cmd0"},
+            {0, nullptr, "OpenSessionForDev"},
+            {1, C<&I2C::OpenSession>, "OpenSession"},
+            {2, nullptr, "HasDevice"},
+            {3, nullptr, "HasDeviceForDev"},
+            {4, nullptr, "OpenSession2"},
         };
         RegisterHandlers(functions);
     }
     ~I2C() override = default;
+
+    Result OpenSession(I2CDevice device, OutInterface<I2CSession> out_session) {
+        LOG_DEBUG(Service, "(stubbed)");
+        *out_session = std::make_shared<I2CSession>(system);
+        R_SUCCEED();
+    }
 };
 
 void LoopProcess(Core::System& system) {