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diff --git a/keyboards/bastardkb/charybdis/charybdis.h b/keyboards/bastardkb/charybdis/charybdis.h
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+++ b/keyboards/bastardkb/charybdis/charybdis.h
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+/*
+ * Copyright 2021 Quentin LEBASTARD <qlebastard@gmail.com>
+ * Copyright 2021 Charly Delay <charly@codesink.dev> (@0xcharly)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+// clang-format off
+#if defined(KEYBOARD_bastardkb_charybdis_3x5)
+#    include "3x5.h"
+#elif defined(KEYBOARD_bastardkb_charybdis_4x6)
+#    include "4x6.h"
+#else
+#    error "Unsuported format"
+#endif
+// clang-format on
+
+#include "quantum.h"
+
+#ifdef POINTING_DEVICE_ENABLE
+#    ifndef NO_CHARYBDIS_KEYCODES
+enum charybdis_keycodes {
+#        ifdef VIA_ENABLE
+    POINTER_DEFAULT_DPI_FORWARD = USER00,
+#        else
+    POINTER_DEFAULT_DPI_FORWARD = SAFE_RANGE,
+#        endif  // VIA_ENABLE
+    POINTER_DEFAULT_DPI_REVERSE,
+    POINTER_SNIPING_DPI_FORWARD,
+    POINTER_SNIPING_DPI_REVERSE,
+    SNIPING_MODE,
+    SNIPING_MODE_TOGGLE,
+    DRAGSCROLL_MODE,
+    DRAGSCROLL_MODE_TOGGLE,
+    CHARYBDIS_SAFE_RANGE,
+};
+
+#        define DPI_MOD POINTER_DEFAULT_DPI_FORWARD
+#        define DPI_RMOD POINTER_DEFAULT_DPI_REVERSE
+#        define S_D_MOD POINTER_SNIPING_DPI_FORWARD
+#        define S_D_RMOD POINTER_SNIPING_DPI_REVERSE
+#        define SNIPING SNIPING_MODE
+#        define SNP_TOG SNIPING_MODE_TOGGLE
+#        define DRGSCRL DRAGSCROLL_MODE
+#        define DRG_TOG DRAGSCROLL_MODE_TOGGLE
+#    endif  // !NO_CHARYBDIS_KEYCODES
+
+/** \brief Return the current DPI value for the pointer's default mode. */
+uint16_t charybdis_get_pointer_default_dpi(void);
+
+/**
+ * \brief Update the pointer's default DPI to the next or previous step.
+ *
+ * Increases the DPI value if `forward` is `true`, decreases it otherwise.
+ * The increment/decrement steps are equal to CHARYBDIS_DEFAULT_DPI_CONFIG_STEP.
+ *
+ * The new value is persisted in EEPROM.
+ */
+void charybdis_cycle_pointer_default_dpi(bool forward);
+
+/**
+ * \brief Same as `charybdis_cycle_pointer_default_dpi`, but do not write to
+ * EEPROM.
+ *
+ * This means that reseting the board will revert the value to the last
+ * persisted one.
+ */
+void charybdis_cycle_pointer_default_dpi_noeeprom(bool forward);
+
+/** \brief Return the current DPI value for the pointer's sniper-mode. */
+uint16_t charybdis_get_pointer_sniping_dpi(void);
+
+/**
+ * \brief Update the pointer's sniper-mode DPI to the next or previous step.
+ *
+ * Increases the DPI value if `forward` is `true`, decreases it otherwise.
+ * The increment/decrement steps are equal to CHARYBDIS_SNIPING_DPI_CONFIG_STEP.
+ *
+ * The new value is persisted in EEPROM.
+ */
+void charybdis_cycle_pointer_sniping_dpi(bool forward);
+
+/**
+ * \brief Same as `charybdis_cycle_pointer_sniping_dpi`, but do not write to
+ * EEPROM.
+ *
+ * This means that reseting the board will revert the value to the last
+ * persisted one.
+ */
+void charybdis_cycle_pointer_sniping_dpi_noeeprom(bool forward);
+
+/** \brief Whether sniper-mode is enabled. */
+bool charybdis_get_pointer_sniping_enabled(void);
+
+/**
+ * \brief Enable/disable sniper mode.
+ *
+ * When sniper mode is enabled the dpi is reduced to slow down the pointer for
+ * more accurate movements.
+ */
+void charybdis_set_pointer_sniping_enabled(bool enable);
+
+/** \brief Whether drag-scroll is enabled. */
+bool charybdis_get_pointer_dragscroll_enabled(void);
+
+/**
+ * \brief Enable/disable drag-scroll mode.
+ *
+ * When drag-scroll mode is enabled, horizontal and vertical pointer movements
+ * are translated into horizontal and vertical scroll movements.
+ */
+void charybdis_set_pointer_dragscroll_enabled(bool enable);
+#endif  // POINTING_DEVICE_ENABLE