| 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 |
