#include <stdbool.h>
+#define PS2_MOUSE_READ_DATA 0xEB
+
+/*
+ * Data format:
+ * byte|7 6 5 4 3 2 1 0
+ * ----+--------------------------------------------------------------
+ * 0|Yovflw Xovflw Ysign Xsign 1 Middle Right Left
+ * 1| X movement(0-255)
+ * 2| Y movement(0-255)
+ */
#define PS2_MOUSE_BTN_MASK 0x07
#define PS2_MOUSE_BTN_LEFT 0
#define PS2_MOUSE_BTN_RIGHT 1
#define PS2_MOUSE_X_OVFLW 6
#define PS2_MOUSE_Y_OVFLW 7
-bool ps2_mouse_enable;
-extern uint8_t ps2_mouse_x;
-extern uint8_t ps2_mouse_y;
-extern uint8_t ps2_mouse_btn;
-extern uint8_t ps2_mouse_error_count;
+
+/*
+ * Scroll by mouse move with pressing button
+ */
+/* mouse button to start scrolling; set 0 to disable scroll */
+#ifndef PS2_MOUSE_SCROLL_BTN_MASK
+#define PS2_MOUSE_SCROLL_BTN_MASK (1<<PS2_MOUSE_BTN_MIDDLE)
+#endif
+/* send button event when button is released within this value(ms); set 0 to disable */
+#ifndef PS2_MOUSE_SCROLL_BTN_SEND
+#define PS2_MOUSE_SCROLL_BTN_SEND 300
+#endif
+/* divide virtical and horizontal mouse move by this to convert to scroll move */
+#ifndef PS2_MOUSE_SCROLL_DIVISOR_V
+#define PS2_MOUSE_SCROLL_DIVISOR_V 2
+#endif
+#ifndef PS2_MOUSE_SCROLL_DIVISOR_H
+#define PS2_MOUSE_SCROLL_DIVISOR_H 2
+#endif
+
uint8_t ps2_mouse_init(void);
-uint8_t ps2_mouse_read(void);
-bool ps2_mouse_changed(void);
-void ps2_mouse_usb_send(void);
-void ps2_mouse_print(void);
+void ps2_mouse_task(void);
#endif