Prototype adapter XInput feasibility

adapter_host_probe.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#include <stdint.h>
+
+#include "tusb.h"
+
+enum class AdapterUsbMode : uint8_t {
+    kSwitchProbe,
+    kXInput,
+};
+
+void adapter_host_probe_init();
+AdapterUsbMode adapter_host_probe_mode();
+void adapter_host_probe_note_string_descriptor(uint8_t index);
+bool adapter_host_probe_vendor_control(uint8_t rhport, uint8_t stage,
+                                       tusb_control_request_t const *request);
+void adapter_host_probe_task();