3 files changed, 127 insertions, 0 deletions

diff --git a/src/hid_core/resources/debug_pad/debug_pad.cpp b/src/hid_core/resources/debug_pad/debug_pad.cpp
new file mode 100644
index 000000000..1102dad6c
--- /dev/null
+++ b/src/hid_core/resources/debug_pad/debug_pad.cpp
@@ -0,0 +1,59 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/settings.h"
+#include "core/core_timing.h"
+#include "hid_core/frontend/emulated_controller.h"
+#include "hid_core/hid_core.h"
+#include "hid_core/hid_types.h"
+#include "hid_core/resources/applet_resource.h"
+#include "hid_core/resources/debug_pad/debug_pad.h"
+#include "hid_core/resources/shared_memory_format.h"
+
+namespace Service::HID {
+
+DebugPad::DebugPad(Core::HID::HIDCore& hid_core_) : ControllerBase{hid_core_} {
+    controller = hid_core.GetEmulatedController(Core::HID::NpadIdType::Other);
+}
+
+DebugPad::~DebugPad() = default;
+
+void DebugPad::OnInit() {}
+
+void DebugPad::OnRelease() {}
+
+void DebugPad::OnUpdate(const Core::Timing::CoreTiming& core_timing) {
+    std::scoped_lock shared_lock{*shared_mutex};
+    const u64 aruid = applet_resource->GetActiveAruid();
+    auto* data = applet_resource->GetAruidData(aruid);
+
+    if (data == nullptr || !data->flag.is_assigned) {
+        return;
+    }
+
+    DebugPadSharedMemoryFormat& shared_memory = data->shared_memory_format->debug_pad;
+
+    if (!IsControllerActivated()) {
+        shared_memory.debug_pad_lifo.buffer_count = 0;
+        shared_memory.debug_pad_lifo.buffer_tail = 0;
+        return;
+    }
+
+    const auto& last_entry = shared_memory.debug_pad_lifo.ReadCurrentEntry().state;
+    next_state.sampling_number = last_entry.sampling_number + 1;
+
+    if (Settings::values.debug_pad_enabled) {
+        next_state.attribute.connected.Assign(1);
+
+        const auto& button_state = controller->GetDebugPadButtons();
+        const auto& stick_state = controller->GetSticks();
+
+        next_state.pad_state = button_state;
+        next_state.l_stick = stick_state.left;
+        next_state.r_stick = stick_state.right;
+    }
+
+    shared_memory.debug_pad_lifo.WriteNextEntry(next_state);
+}
+
+} // namespace Service::HID
diff --git a/src/hid_core/resources/debug_pad/debug_pad.h b/src/hid_core/resources/debug_pad/debug_pad.h
new file mode 100644
index 000000000..73c3d4421
--- /dev/null
+++ b/src/hid_core/resources/debug_pad/debug_pad.h
@@ -0,0 +1,37 @@
+// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "hid_core/resources/controller_base.h"
+#include "hid_core/resources/debug_pad/debug_pad_types.h"
+
+namespace Core::HID {
+class HIDCore;
+class EmulatedController;
+} // namespace Core::HID
+
+namespace Core::Timing {
+class CoreTiming;
+}
+
+namespace Service::HID {
+class DebugPad final : public ControllerBase {
+public:
+    explicit DebugPad(Core::HID::HIDCore& hid_core_);
+    ~DebugPad() override;
+
+    // Called when the controller is initialized
+    void OnInit() override;
+
+    // When the controller is released
+    void OnRelease() override;
+
+    // When the controller is requesting an update for the shared memory
+    void OnUpdate(const Core::Timing::CoreTiming& core_timing) override;
+
+private:
+    DebugPadState next_state{};
+    Core::HID::EmulatedController* controller = nullptr;
+};
+} // namespace Service::HID
diff --git a/src/hid_core/resources/debug_pad/debug_pad_types.h b/src/hid_core/resources/debug_pad/debug_pad_types.h
new file mode 100644
index 000000000..8b5eb108e
--- /dev/null
+++ b/src/hid_core/resources/debug_pad/debug_pad_types.h
@@ -0,0 +1,31 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "hid_core/hid_types.h"
+
+namespace Service::HID {
+
+// This is nn::hid::DebugPadAttribute
+struct DebugPadAttribute {
+    union {
+        u32 raw{};
+        BitField<0, 1, u32> connected;
+    };
+};
+static_assert(sizeof(DebugPadAttribute) == 0x4, "DebugPadAttribute is an invalid size");
+
+// This is nn::hid::DebugPadState
+struct DebugPadState {
+    s64 sampling_number{};
+    DebugPadAttribute attribute{};
+    Core::HID::DebugPadButton pad_state{};
+    Core::HID::AnalogStickState r_stick{};
+    Core::HID::AnalogStickState l_stick{};
+};
+static_assert(sizeof(DebugPadState) == 0x20, "DebugPadState is an invalid state");
+
+} // namespace Service::HID