diff --git a/Documentation/hid/hid-alps.txt b/Documentation/hid/hid-alps.txt
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+ALPS HID Touchpad Protocol
+----------------------
+
+Introduction
+------------
+Currently ALPS HID driver supports U1 Touchpad device.
+
+U1 devuce basic information.
+Vender ID	0x044E
+Product ID	0x120B
+Version ID	0x0121
+
+
+HID Descriptor
+------------
+Byte	Field			Value	Notes
+0	wHIDDescLength		001E	Length of HID Descriptor : 30 bytes
+2	bcdVersion		0100	Compliant with Version 1.00
+4	wReportDescLength	00B2	Report Descriptor is 178 Bytes (0x00B2)
+6	wReportDescRegister	0002	Identifier to read Report Descriptor
+8	wInputRegister		0003	Identifier to read Input Report
+10	wMaxInputLength		0053	Input Report is 80 Bytes + 2
+12	wOutputRegister		0000	Identifier to read Output Report
+14	wMaxOutputLength	0000	No Output Reports
+16	wCommandRegister	0005	Identifier for Command Register
+18	wDataRegister		0006	Identifier for Data Register
+20	wVendorID		044E	Vendor ID 0x044E
+22	wProductID		120B	Product ID 0x120B
+24	wVersionID		0121	Version 01.21
+26	RESERVED		0000	RESERVED
+
+
+Report ID
+------------
+ReportID-1	(Input Reports)	(HIDUsage-Mouse) for TP&SP
+ReportID-2	(Input Reports)	(HIDUsage-keyboard) for TP
+ReportID-3	(Input Reports)	(Vendor Usage: Max 10 finger data) for TP
+ReportID-4	(Input Reports)	(Vendor Usage: ON bit data) for GP
+ReportID-5	(Feature Reports)	Feature Reports
+ReportID-6	(Input Reports)	(Vendor Usage: StickPointer data) for SP
+ReportID-7	(Feature Reports)	Flash update (Bootloader)
+
+
+Data pattern
+------------
+Case1	ReportID_1	TP/SP	Relative/Relative
+Case2	ReportID_3	TP	Absolute
+	ReportID_6	SP	Absolute
+
+
+Command Read/Write
+------------------
+To read/write to RAM, need to send a commands to the device.
+The command format is as below.
+
+DataByte(SET_REPORT)
+Byte1	Command Byte
+Byte2	Address - Byte 0 (LSB)
+Byte3	Address - Byte 1
+Byte4	Address - Byte 2
+Byte5	Address - Byte 3 (MSB)
+Byte6	Value Byte
+Byte7	Checksum
+
+Command Byte is read=0xD1/write=0xD2 .
+Address is read/write RAM address.
+Value Byte is writing data when you send the write commands.
+When you read RAM, there is no meaning.
+
+DataByte(GET_REPORT)
+Byte1	Response Byte
+Byte2	Address - Byte 0 (LSB)
+Byte3	Address - Byte 1
+Byte4	Address - Byte 2
+Byte5	Address - Byte 3 (MSB)
+Byte6	Value Byte
+Byte7	Checksum
+
+Read value is stored in Value Byte.
+
+
+Packet Format
+Touchpad data byte
+------------------
+	b7	b6	b5	b4	b3	b2	b1	b0
+1	0	0	SW6	SW5	SW4	SW3	SW2	SW1
+2	0	0	0	Fcv	Fn3	Fn2	Fn1	Fn0
+3	Xa0_7	Xa0_6	Xa0_5	Xa0_4	Xa0_3	Xa0_2	Xa0_1	Xa0_0
+4	Xa0_15	Xa0_14	Xa0_13	Xa0_12	Xa0_11	Xa0_10	Xa0_9	Xa0_8
+5	Ya0_7	Ya0_6	Ya0_5	Ya0_4	Ya0_3	Ya0_2	Ya0_1	Ya0_0
+6	Ya0_15	Ya0_14	Ya0_13	Ya0_12	Ya0_11	Ya0_10	Ya0_9	Ya0_8
+7	LFB0	Zs0_6	Zs0_5	Zs0_4	Zs0_3	Zs0_2	Zs0_1	Zs0_0
+
+8	Xa1_7	Xa1_6	Xa1_5	Xa1_4	Xa1_3	Xa1_2	Xa1_1	Xa1_0
+9	Xa1_15	Xa1_14	Xa1_13	Xa1_12	Xa1_11	Xa1_10	Xa1_9	Xa1_8
+10	Ya1_7	Ya1_6	Ya1_5	Ya1_4	Ya1_3	Ya1_2	Ya1_1	Ya1_0
+11	Ya1_15	Ya1_14	Ya1_13	Ya1_12	Ya1_11	Ya1_10	Ya1_9	Ya1_8
+12	LFB1	Zs1_6	Zs1_5	Zs1_4	Zs1_3	Zs1_2	Zs1_1	Zs1_0
+
+13	Xa2_7	Xa2_6	Xa2_5	Xa2_4	Xa2_3	Xa2_2	Xa2_1	Xa2_0
+14	Xa2_15	Xa2_14	Xa2_13	Xa2_12	Xa2_11	Xa2_10	Xa2_9	Xa2_8
+15	Ya2_7	Ya2_6	Ya2_5	Ya2_4	Ya2_3	Ya2_2	Ya2_1	Ya2_0
+16	Ya2_15	Ya2_14	Ya2_13	Ya2_12	Ya2_11	Ya2_10	Ya2_9	Ya2_8
+17	LFB2	Zs2_6	Zs2_5	Zs2_4	Zs2_3	Zs2_2	Zs2_1	Zs2_0
+
+18	Xa3_7	Xa3_6	Xa3_5	Xa3_4	Xa3_3	Xa3_2	Xa3_1	Xa3_0
+19	Xa3_15	Xa3_14	Xa3_13	Xa3_12	Xa3_11	Xa3_10	Xa3_9	Xa3_8
+20	Ya3_7	Ya3_6	Ya3_5	Ya3_4	Ya3_3	Ya3_2	Ya3_1	Ya3_0
+21	Ya3_15	Ya3_14	Ya3_13	Ya3_12	Ya3_11	Ya3_10	Ya3_9	Ya3_8
+22	LFB3	Zs3_6	Zs3_5	Zs3_4	Zs3_3	Zs3_2	Zs3_1	Zs3_0
+
+23	Xa4_7	Xa4_6	Xa4_5	Xa4_4	Xa4_3	Xa4_2	Xa4_1	Xa4_0
+24	Xa4_15	Xa4_14	Xa4_13	Xa4_12	Xa4_11	Xa4_10	Xa4_9	Xa4_8
+25	Ya4_7	Ya4_6	Ya4_5	Ya4_4	Ya4_3	Ya4_2	Ya4_1	Ya4_0
+26	Ya4_15	Ya4_14	Ya4_13	Ya4_12	Ya4_11	Ya4_10	Ya4_9	Ya4_8
+27	LFB4	Zs4_6	Zs4_5	Zs4_4	Zs4_3	Zs4_2	Zs4_1	Zs4_0
+
+
+SW1-SW6:	SW ON/OFF status
+Xan_15-0(16bit):X Absolute data of the "n"th finger
+Yan_15-0(16bit):Y Absolute data of the "n"th finger
+Zsn_6-0(7bit):	Operation area of the "n"th finger
+
+
+StickPointer data byte
+------------------
+	b7	b6	b5	b4	b3	b2	b1	b0
+Byte1	1	1	1	0	1	SW3	SW2	SW1
+Byte2	X7	X6	X5	X4	X3	X2	X1	X0
+Byte3	X15	X14	X13	X12	X11	X10	X9	X8
+Byte4	Y7	Y6	Y5	Y4	Y3	Y2	Y1	Y0
+Byte5	Y15	Y14	Y13	Y12	Y11	Y10	Y9	Y8
+Byte6	Z7	Z6	Z5	Z4	Z3	Z2	Z1	Z0
+Byte7	T&P	Z14	Z13	Z12	Z11	Z10	Z9	Z8
+
+SW1-SW3:	SW ON/OFF status
+Xn_15-0(16bit):X Absolute data
+Yn_15-0(16bit):Y Absolute data
+Zn_14-0(15bit):Z