Copyright (C) 2002-2010 Sentelic Corporation.
  Last update: Jan-13-2010

  
  ==============================================================================
  * Finger Sensing Pad Intellimouse Mode(scrolling wheel, 4th and 5th buttons)
  ==============================================================================
  A) MSID 4: Scrolling wheel mode plus Forward page(4th button) and Backward
     page (5th button)
  @1. Set sample rate to 200;
  @2. Set sample rate to 200;
  @3. Set sample rate to 80;
  @4. Issuing the "Get device ID" command (0xF2) and waits for the response;
  @5. FSP will respond 0x04.
  
  Packet 1
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |Y|X|y|x|1|M|R|L|  2  |X|X|X|X|X|X|X|X|  3 |Y|Y|Y|Y|Y|Y|Y|Y|  4 | | |B|F|W|W|W|W|
        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7 => Y overflow
          Bit6 => X overflow
          Bit5 => Y sign bit
          Bit4 => X sign bit
          Bit3 => 1
          Bit2 => Middle Button, 1 is pressed, 0 is not pressed.
          Bit1 => Right Button, 1 is pressed, 0 is not pressed.
          Bit0 => Left Button, 1 is pressed, 0 is not pressed.
  Byte 2: X Movement(9-bit 2's complement integers)
  Byte 3: Y Movement(9-bit 2's complement integers)
  Byte 4: Bit3~Bit0 => the scrolling wheel's movement since the last data report.
                       valid values, -8 ~ +7
          Bit4 => 1 = 4th mouse button is pressed, Forward one page.
                  0 = 4th mouse button is not pressed.
          Bit5 => 1 = 5th mouse button is pressed, Backward one page.
                  0 = 5th mouse button is not pressed.
  
  B) MSID 6: Horizontal and Vertical scrolling.
  @ Set bit 1 in register 0x40 to 1
  
  # FSP replaces scrolling wheel's movement as 4 bits to show horizontal and
    vertical scrolling.
  
  Packet 1
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|

    1   |Y|X|y|x|1|M|R|L|  2  |X|X|X|X|X|X|X|X|  3 |Y|Y|Y|Y|Y|Y|Y|Y|  4 | | |B|F|r|l|u|d|

        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7 => Y overflow
          Bit6 => X overflow
          Bit5 => Y sign bit
          Bit4 => X sign bit
          Bit3 => 1
          Bit2 => Middle Button, 1 is pressed, 0 is not pressed.
          Bit1 => Right Button, 1 is pressed, 0 is not pressed.
          Bit0 => Left Button, 1 is pressed, 0 is not pressed.
  Byte 2: X Movement(9-bit 2's complement integers)
  Byte 3: Y Movement(9-bit 2's complement integers)
  Byte 4: Bit0 => the Vertical scrolling movement downward.
  	Bit1 => the Vertical scrolling movement upward.

  	Bit2 => the Horizontal scrolling movement leftward.
  	Bit3 => the Horizontal scrolling movement rightward.

          Bit4 => 1 = 4th mouse button is pressed, Forward one page.
                  0 = 4th mouse button is not pressed.
          Bit5 => 1 = 5th mouse button is pressed, Backward one page.
                  0 = 5th mouse button is not pressed.
  
  C) MSID 7:

  # FSP uses 2 packets (8 Bytes) to represent Absolute Position.

    so we have PACKET NUMBER to identify packets.
    If PACKET NUMBER is 0, the packet is Packet 1.
    If PACKET NUMBER is 1, the packet is Packet 2.
    Please count this number in program.
  
  # MSID6 special packet will be enable at the same time when enable MSID 7.
  
  ==============================================================================
  * Absolute position for STL3886-G0.
  ==============================================================================
  @ Set bit 2 or 3 in register 0x40 to 1
  @ Set bit 6 in register 0x40 to 1
  
  Packet 1 (ABSOLUTE POSITION)
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |0|1|V|1|1|M|R|L|  2  |X|X|X|X|X|X|X|X|  3 |Y|Y|Y|Y|Y|Y|Y|Y|  4 |r|l|d|u|X|X|Y|Y|
        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7~Bit6 => 00, Normal data packet
                    => 01, Absolute coordination packet
                    => 10, Notify packet
          Bit5 => valid bit
          Bit4 => 1
          Bit3 => 1
          Bit2 => Middle Button, 1 is pressed, 0 is not pressed.
          Bit1 => Right Button, 1 is pressed, 0 is not pressed.
          Bit0 => Left Button, 1 is pressed, 0 is not pressed.
  Byte 2: X coordinate (xpos[9:2])
  Byte 3: Y coordinate (ypos[9:2])
  Byte 4: Bit1~Bit0 => Y coordinate (xpos[1:0])
          Bit3~Bit2 => X coordinate (ypos[1:0])
          Bit4 => scroll up
          Bit5 => scroll down
          Bit6 => scroll left
          Bit7 => scroll right
  
  Notify Packet for G0
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |1|0|0|1|1|M|R|L|  2  |C|C|C|C|C|C|C|C|  3 |M|M|M|M|M|M|M|M|  4 |0|0|0|0|0|0|0|0|
        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7~Bit6 => 00, Normal data packet
                    => 01, Absolute coordination packet
                    => 10, Notify packet
          Bit5 => 0
          Bit4 => 1
          Bit3 => 1
          Bit2 => Middle Button, 1 is pressed, 0 is not pressed.
          Bit1 => Right Button, 1 is pressed, 0 is not pressed.
          Bit0 => Left Button, 1 is pressed, 0 is not pressed.
  Byte 2: Message Type => 0x5A (Enable/Disable status packet)
          Mode Type => 0xA5 (Normal/Icon mode status)
  Byte 3: Message Type => 0x00 (Disabled)
                       => 0x01 (Enabled)
          Mode Type    => 0x00 (Normal)
                       => 0x01 (Icon)
  Byte 4: Bit7~Bit0 => Don't Care
  
  ==============================================================================

  * Absolute position for STL3888-Ax.

  ==============================================================================
  Packet 1 (ABSOLUTE POSITION)
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |0|1|V|A|1|L|0|1|  2  |X|X|X|X|X|X|X|X|  3 |Y|Y|Y|Y|Y|Y|Y|Y|  4 |x|x|y|y|X|X|Y|Y|
        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7~Bit6 => 00, Normal data packet
                    => 01, Absolute coordination packet
                    => 10, Notify packet
          Bit5 => Valid bit, 0 means that the coordinate is invalid or finger up.
                  When both fingers are up, the last two reports have zero valid
                  bit.
          Bit4 => arc
          Bit3 => 1
          Bit2 => Left Button, 1 is pressed, 0 is released.
          Bit1 => 0
          Bit0 => 1
  Byte 2: X coordinate (xpos[9:2])
  Byte 3: Y coordinate (ypos[9:2])
  Byte 4: Bit1~Bit0 => Y coordinate (xpos[1:0])
          Bit3~Bit2 => X coordinate (ypos[1:0])
          Bit5~Bit4 => y1_g
          Bit7~Bit6 => x1_g
  
  Packet 2 (ABSOLUTE POSITION)
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |0|1|V|A|1|R|1|0|  2  |X|X|X|X|X|X|X|X|  3 |Y|Y|Y|Y|Y|Y|Y|Y|  4 |x|x|y|y|X|X|Y|Y|
        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7~Bit6 => 00, Normal data packet
                    => 01, Absolute coordinates packet
                    => 10, Notify packet
          Bit5 => Valid bit, 0 means that the coordinate is invalid or finger up.
                  When both fingers are up, the last two reports have zero valid
                  bit.
          Bit4 => arc
          Bit3 => 1
          Bit2 => Right Button, 1 is pressed, 0 is released.
          Bit1 => 1
          Bit0 => 0
  Byte 2: X coordinate (xpos[9:2])
  Byte 3: Y coordinate (ypos[9:2])
  Byte 4: Bit1~Bit0 => Y coordinate (xpos[1:0])
          Bit3~Bit2 => X coordinate (ypos[1:0])
          Bit5~Bit4 => y2_g
          Bit7~Bit6 => x2_g

  Notify Packet for STL3888-Ax

     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |1|0|1|P|1|M|R|L|  2  |C|C|C|C|C|C|C|C|  3 |0|0|F|F|0|0|0|i|  4 |r|l|d|u|0|0|0|0|
        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7~Bit6 => 00, Normal data packet

                    => 01, Absolute coordinates packet

                    => 10, Notify packet
          Bit5 => 1
          Bit4 => when in absolute coordinates mode (valid when EN_PKT_GO is 1):
                  0: left button is generated by the on-pad command
                  1: left button is generated by the external button
          Bit3 => 1
          Bit2 => Middle Button, 1 is pressed, 0 is not pressed.
          Bit1 => Right Button, 1 is pressed, 0 is not pressed.
          Bit0 => Left Button, 1 is pressed, 0 is not pressed.
  Byte 2: Message Type => 0xB7 (Multi Finger, Multi Coordinate mode)
  Byte 3: Bit7~Bit6 => Don't care
          Bit5~Bit4 => Number of fingers
          Bit3~Bit1 => Reserved
          Bit0 => 1: enter gesture mode; 0: leaving gesture mode
  Byte 4: Bit7 => scroll right button
          Bit6 => scroll left button
          Bit5 => scroll down button
          Bit4 => scroll up button

              * Note that if gesture and additional buttoni (Bit4~Bit7)
                happen at the same time, the button information will not
                be sent.
          Bit3~Bit0 => Reserved
  
  Sample sequence of Multi-finger, Multi-coordinate mode:
  
  	notify packet (valid bit == 1), abs pkt 1, abs pkt 2, abs pkt 1,
  	abs pkt 2, ..., notify packet (valid bit == 0)
  
  ==============================================================================
  * Absolute position for STL3888-B0.
  ==============================================================================
  Packet 1(ABSOLUTE POSITION)
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |0|1|V|F|1|0|R|L|  2  |X|X|X|X|X|X|X|X|  3 |Y|Y|Y|Y|Y|Y|Y|Y|  4 |r|l|u|d|X|X|Y|Y|
        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7~Bit6 => 00, Normal data packet
                    => 01, Absolute coordinates packet
                    => 10, Notify packet
          Bit5 => Valid bit, 0 means that the coordinate is invalid or finger up.
                  When both fingers are up, the last two reports have zero valid
                  bit.
          Bit4 => finger up/down information. 1: finger down, 0: finger up.
          Bit3 => 1
          Bit2 => finger index, 0 is the first finger, 1 is the second finger.
          Bit1 => Right Button, 1 is pressed, 0 is not pressed.
          Bit0 => Left Button, 1 is pressed, 0 is not pressed.
  Byte 2: X coordinate (xpos[9:2])
  Byte 3: Y coordinate (ypos[9:2])
  Byte 4: Bit1~Bit0 => Y coordinate (xpos[1:0])
          Bit3~Bit2 => X coordinate (ypos[1:0])
          Bit4 => scroll down button
          Bit5 => scroll up button
          Bit6 => scroll left button
          Bit7 => scroll right button
  
  Packet 2 (ABSOLUTE POSITION)
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |0|1|V|F|1|1|R|L|  2  |X|X|X|X|X|X|X|X|  3 |Y|Y|Y|Y|Y|Y|Y|Y|  4 |r|l|u|d|X|X|Y|Y|
        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7~Bit6 => 00, Normal data packet
                    => 01, Absolute coordination packet
                    => 10, Notify packet
          Bit5 => Valid bit, 0 means that the coordinate is invalid or finger up.
                  When both fingers are up, the last two reports have zero valid
                  bit.
          Bit4 => finger up/down information. 1: finger down, 0: finger up.
          Bit3 => 1
          Bit2 => finger index, 0 is the first finger, 1 is the second finger.
          Bit1 => Right Button, 1 is pressed, 0 is not pressed.
          Bit0 => Left Button, 1 is pressed, 0 is not pressed.
  Byte 2: X coordinate (xpos[9:2])
  Byte 3: Y coordinate (ypos[9:2])
  Byte 4: Bit1~Bit0 => Y coordinate (xpos[1:0])
          Bit3~Bit2 => X coordinate (ypos[1:0])
          Bit4 => scroll down button
          Bit5 => scroll up button
          Bit6 => scroll left button
          Bit7 => scroll right button
  
  Notify Packet for STL3888-B0
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |1|0|1|P|1|M|R|L|  2  |C|C|C|C|C|C|C|C|  3 |0|0|F|F|0|0|0|i|  4 |r|l|u|d|0|0|0|0|
        |---------------|     |---------------|    |---------------|    |---------------|
  
  Byte 1: Bit7~Bit6 => 00, Normal data packet
                    => 01, Absolute coordination packet
                    => 10, Notify packet
          Bit5 => 1
          Bit4 => when in absolute coordinate mode (valid when EN_PKT_GO is 1):
                  0: left button is generated by the on-pad command
                  1: left button is generated by the external button
          Bit3 => 1
          Bit2 => Middle Button, 1 is pressed, 0 is not pressed.
          Bit1 => Right Button, 1 is pressed, 0 is not pressed.
          Bit0 => Left Button, 1 is pressed, 0 is not pressed.
  Byte 2: Message Type => 0xB7 (Multi Finger, Multi Coordinate mode)
  Byte 3: Bit7~Bit6 => Don't care
          Bit5~Bit4 => Number of fingers
          Bit3~Bit1 => Reserved
          Bit0 => 1: enter gesture mode; 0: leaving gesture mode
  Byte 4: Bit7 => scroll right button
          Bit6 => scroll left button
          Bit5 => scroll up button
          Bit4 => scroll down button
              * Note that if gesture and additional button(Bit4~Bit7)
                happen at the same time, the button information will not
                be sent.

          Bit3~Bit0 => Reserved
  
  Sample sequence of Multi-finger, Multi-coordinate mode:
  
  	notify packet (valid bit == 1), abs pkt 1, abs pkt 2, abs pkt 1,

  	abs pkt 2, ..., notify packet (valid bit == 0)

  
  ==============================================================================
  * FSP Enable/Disable packet
  ==============================================================================
     Bit 7 6 5 4 3 2 1 0       7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0      7 6 5 4 3 2 1 0
  BYTE  |---------------|BYTE |---------------|BYTE|---------------|BYTE|---------------|
    1   |Y|X|0|0|1|M|R|L|  2  |0|1|0|1|1|0|1|E|  3 | | | | | | | | |  4 | | | | | | | | |
        |---------------|     |---------------|    |---------------|    |---------------|
  
  FSP will send out enable/disable packet when FSP receive PS/2 enable/disable
  command. Host will receive the packet which Middle, Right, Left button will
  be set. The packet only use byte 0 and byte 1 as a pattern of original packet.
  Ignore the other bytes of the packet.
  
  Byte 1: Bit7 => 0, Y overflow
          Bit6 => 0, X overflow
  	Bit5 => 0, Y sign bit
          Bit4 => 0, X sign bit
  	Bit3 => 1
  	Bit2 => 1, Middle Button
          Bit1 => 1, Right Button
          Bit0 => 1, Left Button
  Byte 2: Bit7~1 => (0101101b)
          Bit0 => 1 = Enable
  		0 = Disable
  Byte 3: Don't care
  Byte 4: Don't care (MOUSE ID 3, 4)
  Byte 5~8: Don't care (Absolute packet)
  
  ==============================================================================
  * PS/2 Command Set
  ==============================================================================
  
  FSP supports basic PS/2 commanding set and modes, refer to following URL for
  details about PS/2 commands:

  http://www.computer-engineering.org/ps2mouse/

  
  ==============================================================================
  * Programming Sequence for Determining Packet Parsing Flow
  ==============================================================================
  1. Identify FSP by reading device ID(0x00) and version(0x01) register
  
  2. Determine number of buttons by reading status2 (0x0b) register
  
  	buttons = reg[0x0b] & 0x30
  
  	if buttons == 0x30 or buttons == 0x20:
  		# two/four buttons
  		Refer to 'Finger Sensing Pad PS/2 Mouse Intellimouse'
  		section A for packet parsing detail(ignore byte 4, bit ~ 7)
  	elif buttons == 0x10:
  		# 6 buttons
  		Refer to 'Finger Sensing Pad PS/2 Mouse Intellimouse'
  		section B for packet parsing detail
  	elif buttons == 0x00:
  		# 6 buttons
  		Refer to 'Finger Sensing Pad PS/2 Mouse Intellimouse'
  		section A for packet parsing detail
  
  ==============================================================================
  * Programming Sequence for Register Reading/Writing
  ==============================================================================
  
  Register inversion requirement:
  
    Following values needed to be inverted(the '~' operator in C) before being
  sent to FSP:
  
  	0xe9, 0xee, 0xf2 and 0xff.
  
  Register swapping requirement:
  
    Following values needed to have their higher 4 bits and lower 4 bits being
  swapped before being sent to FSP:
  
  	10, 20, 40, 60, 80, 100 and 200.
  
  Register reading sequence:
  
  	1. send 0xf3 PS/2 command to FSP;
  
  	2. send 0x66 PS/2 command to FSP;
  
  	3. send 0x88 PS/2 command to FSP;
  
  	4. send 0xf3 PS/2 command to FSP;
  
  	5. if the register address being to read is not required to be
  	inverted(refer to the 'Register inversion requirement' section),
  	goto step 6
  
  	5a. send 0x68 PS/2 command to FSP;
  
  	5b. send the inverted register address to FSP and goto step 8;
  
  	6. if the register address being to read is not required to be
  	swapped(refer to the 'Register swapping requirement' section),
  	goto step 7
  
  	6a. send 0xcc PS/2 command to FSP;
  
  	6b. send the swapped register address to FSP and goto step 8;
  
  	7. send 0x66 PS/2 command to FSP;
  
  	7a. send the original register address to FSP and goto step 8;
  
  	8. send 0xe9(status request) PS/2 command to FSP;
  
  	9. the response read from FSP should be the requested register value.
  
  Register writing sequence:
  
  	1. send 0xf3 PS/2 command to FSP;
  
  	2. if the register address being to write is not required to be
  	inverted(refer to the 'Register inversion requirement' section),
  	goto step 3
  
  	2a. send 0x74 PS/2 command to FSP;
  
  	2b. send the inverted register address to FSP and goto step 5;
  
  	3. if the register address being to write is not required to be
  	swapped(refer to the 'Register swapping requirement' section),
  	goto step 4
  
  	3a. send 0x77 PS/2 command to FSP;
  
  	3b. send the swapped register address to FSP and goto step 5;
  
  	4. send 0x55 PS/2 command to FSP;
  
  	4a. send the register address to FSP and goto step 5;
  
  	5. send 0xf3 PS/2 command to FSP;
  
  	6. if the register value being to write is not required to be
  	inverted(refer to the 'Register inversion requirement' section),
  	goto step 7
  
  	6a. send 0x47 PS/2 command to FSP;
  
  	6b. send the inverted register value to FSP and goto step 9;
  
  	7. if the register value being to write is not required to be
  	swapped(refer to the 'Register swapping requirement' section),
  	goto step 8
  
  	7a. send 0x44 PS/2 command to FSP;
  
  	7b. send the swapped register value to FSP and goto step 9;
  
  	8. send 0x33 PS/2 command to FSP;
  
  	8a. send the register value to FSP;
  
  	9. the register writing sequence is completed.
  
  ==============================================================================
  * Register Listing
  ==============================================================================
  
  offset	width		default	r/w	name
  0x00	bit7~bit0	0x01	RO	device ID
  
  0x01	bit7~bit0	0xc0	RW	version ID
  
  0x02	bit7~bit0	0x01	RO	vendor ID
  
  0x03	bit7~bit0	0x01	RO	product ID
  
  0x04	bit3~bit0	0x01	RW	revision ID
  
  0x0b				RO	test mode status 1
  	bit3		1	RO	0: rotate 180 degree, 1: no rotation
  
  	bit5~bit4		RO	number of buttons
  			11 => 2, lbtn/rbtn
  			10 => 4, lbtn/rbtn/scru/scrd
  			01 => 6, lbtn/rbtn/scru/scrd/scrl/scrr
  			00 => 6, lbtn/rbtn/scru/scrd/fbtn/bbtn
  
  0x0f				RW	register file page control
  	bit0		0	RW	1 to enable page 1 register files
  
  0x10				RW	system control 1
  	bit0		1	RW	Reserved, must be 1
  	bit1		0	RW	Reserved, must be 0
  	bit4		1	RW	Reserved, must be 0
  	bit5		0	RW	register clock gating enable
  					0: read only, 1: read/write enable
  	(Note that following registers does not require clock gating being
  	enabled prior to write: 05 06 07 08 09 0c 0f 10 11 12 16 17 18 23 2e

  	40 41 42 43.  In addition to that, this bit must be 1 when gesture
  	mode is enabled)

  
  0x31				RW	on-pad command detection
  	bit7		0	RW	on-pad command left button down tag
  					enable
  					0: disable, 1: enable
  
  0x34				RW	on-pad command control 5
  	bit4~bit0	0x05	RW	XLO in 0s/4/1, so 03h = 0010.1b = 2.5
  	(Note that position unit is in 0.5 scanline)
  
  	bit7		0	RW	on-pad tap zone enable
  					0: disable, 1: enable
  
  0x35				RW	on-pad command control 6
  	bit4~bit0	0x1d	RW	XHI in 0s/4/1, so 19h = 1100.1b = 12.5
  	(Note that position unit is in 0.5 scanline)
  
  0x36				RW	on-pad command control 7
  	bit4~bit0	0x04	RW	YLO in 0s/4/1, so 03h = 0010.1b = 2.5
  	(Note that position unit is in 0.5 scanline)
  
  0x37				RW	on-pad command control 8
  	bit4~bit0	0x13	RW	YHI in 0s/4/1, so 11h = 1000.1b = 8.5
  	(Note that position unit is in 0.5 scanline)
  
  0x40				RW	system control 5
  	bit1		0	RW	FSP Intellimouse mode enable
  					0: disable, 1: enable
  
  	bit2		0	RW	movement + abs. coordinate mode enable
  					0: disable, 1: enable
  	(Note that this function has the functionality of bit 1 even when
  	bit 1 is not set. However, the format is different from that of bit 1.
  	In addition, when bit 1 and bit 2 are set at the same time, bit 2 will
  	override bit 1.)
  
  	bit3		0	RW	abs. coordinate only mode enable
  					0: disable, 1: enable
  	(Note that this function has the functionality of bit 1 even when
  	bit 1 is not set. However, the format is different from that of bit 1.
  	In addition, when bit 1, bit 2 and bit 3 are set at the same time,
  	bit 3 will override bit 1 and 2.)
  
  	bit5		0	RW	auto switch enable
  					0: disable, 1: enable
  
  	bit6		0	RW	G0 abs. + notify packet format enable
  					0: disable, 1: enable
  	(Note that the absolute/relative coordinate output still depends on
  	bit 2 and 3.  That is, if any of those bit is 1, host will receive
  	absolute coordinates; otherwise, host only receives packets with
  	relative coordinate.)

  	bit7		0	RW	EN_PS2_F2: PS/2 gesture mode 2nd
  					finger packet enable
  					0: disable, 1: enable

  0x43				RW	on-pad control
  	bit0		0	RW	on-pad control enable
  					0: disable, 1: enable
  	(Note that if this bit is cleared, bit 3/5 will be ineffective)
  
  	bit3		0	RW	on-pad fix vertical scrolling enable
  					0: disable, 1: enable
  
  	bit5		0	RW	on-pad fix horizontal scrolling enable
  					0: disable, 1: enable