Input: add new driver for Sentelic Finger Sensing Pad

This is the driver for Sentelic Finger Sensing Pad which can be found
on MSI WIND Netbook.

Signed-off-by: Tai-hwa Liang <avatar@sentelic.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 475 insertions, 0 deletions

diff --git a/Documentation/input/sentelic.txt b/Documentation/input/sentelic.txt
new file mode 100644
index 0000000..f7160a2
--- /dev/null
+++ b/Documentation/input/sentelic.txt
@@ -0,0 +1,475 @@
+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