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+Copyright (C) 2002-2008 Sentelic Corporation.
+Last update: Oct-31-2008
+
+==============================================================================
+* 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|l|r|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 Vertical scrolling movement rightward.
+ Bit3 => the Vertical scrolling movement leftward.
+ 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) data 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-A0.
+==============================================================================
+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-A0
+ 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 coordination 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 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/index.php?title=PS/2_Mouse_Interface
+
+==============================================================================
+* 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.)
+
+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.)
+
+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