diff --git a/switch2_commands.h b/switch2_commands.h
new file mode 100644
index 0000000..bd2cfcd
--- /dev/null
+++ b/switch2_commands.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+
+enum class Switch2VendorCommand {
+    Unsupported,
+    SelectReport05,
+    SelectReport09,
+    InitializeUsb,
+};
+
+Switch2VendorCommand switch2_classify_vendor_request(
+    const uint8_t* data,
+    std::size_t length);
+
+std::size_t switch2_build_vendor_response(
+    Switch2VendorCommand command,
+    uint8_t* output,
+    std::size_t capacity);