diff --git a/src/add-ons/accelerants/via/engine/proto.h b/src/add-ons/accelerants/via/engine/proto.h
new file mode 100644
index 0000000000..117001a122
--- /dev/null
+++ b/src/add-ons/accelerants/via/engine/proto.h
@@ -0,0 +1,130 @@
+/* general card functions */
+status_t eng_general_powerup(void);
+status_t eng_set_cas_latency(void);
+void setup_virtualized_heads(bool);
+void set_crtc_owner(bool);
+status_t eng_general_output_select(bool);
+status_t eng_general_head_select(bool);
+status_t eng_general_wait_retrace(void);
+status_t eng_general_validate_pic_size (display_mode *target, uint32 *bytes_per_row, bool *acc_mode);
+
+/* AGP functions */
+status_t eng_agp_setup(void);
+
+/* apsed: logging macros */
+#define MSG(args) do { /* if needed or si->settings with si NULL */ \
+	eng_log args; \
+} while (0)
+#define LOG(level_bit, args) do { \
+	uint32 mod = (si->settings.logmask &  0xfffffff0) & MODULE_BIT; \
+	uint32 lev = (si->settings.logmask & ~0xfffffff0) & level_bit; \
+	if (mod && lev) eng_log args; \
+} while (0)
+
+/* support functions */
+void delay(bigtime_t i);
+void eng_log(char *format, ...);
+
+/* i2c functions */
+int i2c_maven_read(unsigned char address);
+void i2c_maven_write(unsigned char address, unsigned char data);
+status_t i2c_init(void);
+status_t i2c_maven_probe(void);
+
+/* card info functions */
+status_t parse_pins(void);
+void get_panel_modes(display_mode *p1, display_mode *p2, bool *pan1, bool *pan2);
+void fake_panel_start(void);
+void set_specs(void);
+void dump_pins(void);
+
+/* DAC functions */
+bool eng_dac_crt_connected(void);
+status_t eng_dac_mode(int,float);
+status_t eng_dac_palette(uint8*,uint8*,uint8*);
+status_t eng_dac_pix_pll_find(display_mode target,float * result,uint8 *,uint8 *,uint8 *, uint8);
+status_t eng_dac_set_pix_pll(display_mode target);
+status_t eng_dac_sys_pll_find(float, float*, uint8*, uint8*, uint8*, uint8);
+
+/* DAC2 functions */
+bool eng_dac2_crt_connected(void);
+status_t eng_dac2_mode(int,float);
+status_t eng_dac2_palette(uint8*,uint8*,uint8*);
+status_t eng_dac2_pix_pll_find(display_mode target,float * result,uint8 *,uint8 *,uint8 *, uint8);
+status_t eng_dac2_set_pix_pll(display_mode target);
+
+/*MAVENTV functions*/
+status_t g100_g400max_maventv_vid_pll_find(
+	display_mode target, unsigned int * ht_new, unsigned int * ht_last_line,
+	uint8 * m_result, uint8 * n_result, uint8 * p_result);
+int maventv_init(display_mode target);
+
+/* CRTC1 functions */
+status_t eng_crtc_validate_timing(
+	uint16 *hd_e,uint16 *hs_s,uint16 *hs_e,uint16 *ht,
+	uint16 *vd_e,uint16 *vs_s,uint16 *vs_e,uint16 *vt
+);
+status_t eng_crtc_set_timing(display_mode target);
+status_t eng_crtc_depth(int mode);
+status_t eng_crtc_set_display_start(uint32 startadd,uint8 bpp); 
+status_t eng_crtc_set_display_pitch(void);
+
+status_t eng_crtc_dpms(bool, bool, bool);
+status_t eng_crtc_dpms_fetch(bool*, bool*, bool*);
+status_t eng_crtc_mem_priority(uint8);
+
+status_t eng_crtc_cursor_init(void); /*Yes, cursor follows CRTC1 - not the DAC!*/
+status_t eng_crtc_cursor_define(uint8*,uint8*);
+status_t eng_crtc_cursor_position(uint16 x ,uint16 y);
+status_t eng_crtc_cursor_show(void);
+status_t eng_crtc_cursor_hide(void);
+
+/* CRTC2 functions */
+status_t eng_crtc2_validate_timing(
+	uint16 *hd_e,uint16 *hs_s,uint16 *hs_e,uint16 *ht,
+	uint16 *vd_e,uint16 *vs_s,uint16 *vs_e,uint16 *vt
+);
+status_t eng_crtc2_set_timing(display_mode target);
+status_t eng_crtc2_depth(int mode);
+status_t eng_crtc2_set_display_start(uint32 startadd,uint8 bpp); 
+status_t eng_crtc2_set_display_pitch(void);
+
+status_t eng_crtc2_dpms(bool, bool, bool);
+status_t eng_crtc2_dpms_fetch(bool*, bool*, bool*);
+status_t eng_crtc2_mem_priority(uint8);
+
+status_t eng_crtc2_cursor_init(void);
+status_t eng_crtc2_cursor_define(uint8*,uint8*);
+status_t eng_crtc2_cursor_position(uint16 x ,uint16 y);
+status_t eng_crtc2_cursor_show(void);
+status_t eng_crtc2_cursor_hide(void);
+
+/* acceleration functions */
+status_t check_acc_capability(uint32 feature);
+status_t eng_acc_init(void);
+status_t eng_acc_setup_blit(void);
+status_t eng_acc_blit(uint16,uint16,uint16, uint16,uint16,uint16 );
+status_t eng_acc_setup_rectangle(uint32 color);
+status_t eng_acc_rectangle(uint32 xs,uint32 xe,uint32 ys,uint32 yl);
+status_t eng_acc_setup_rect_invert(void);
+status_t eng_acc_rectangle_invert(uint32 xs,uint32 xe,uint32 ys,uint32 yl);
+status_t eng_acc_transparent_blit(uint16,uint16,uint16, uint16,uint16,uint16, uint32);
+status_t eng_acc_video_blit(uint16 xs,uint16 ys,uint16 ws, uint16 hs,
+	uint16 xd,uint16 yd,uint16 wd,uint16 hd);
+status_t eng_acc_wait_idle(void);
+
+/* backend scaler functions */
+status_t check_overlay_capability(uint32 feature);
+void eng_bes_move_overlay(void);
+status_t eng_bes_to_crtc(bool crtc);
+status_t eng_bes_init(void);
+status_t eng_configure_bes
+	(const overlay_buffer *ob, const overlay_window *ow,const overlay_view *ov, int offset);
+status_t eng_release_bes(void);
+
+/* I2C functions */
+status_t i2c_sec_tv_adapter(void);
+
+/* driver structures and enums */
+enum{BPP8 = 0, BPP15 = 1, BPP16 = 2, BPP24 = 3, BPP32 = 4};
+enum{DS_CRTC1DAC_CRTC2MAVEN, DS_CRTC1MAVEN_CRTC2DAC, DS_CRTC1CON1_CRTC2CON2, DS_CRTC1CON2_CRTC2CON1};