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- ALPS Touchpad Protocol
- ----------------------
- Introduction
- ------------
- Currently the ALPS touchpad driver supports two protocol versions in use by
- ALPS touchpads, the "old" and "new" protocol versions. Fundamentally these
- differ only in the format of their event packets (in reality many features may
- be found on new protocol devices that aren't found on the old protocol
- devices, but these are handled transparently as feature differences rather
- than protocol differences).
- Detection
- ---------
- All ALPS touchpads should respond to the "E6 report" command sequence:
- E8-E6-E6-E6-E9. An ALPS touchpad should respond with either 00-00-0A or
- 00-00-64.
- If the E6 report is successful, the touchpad model is identified using the "E7
- report" sequence: E8-E7-E7-E7-E9. The response is the model signature and is
- matched against known models in the alps_model_data_array.
- Packet Format
- -------------
- In the following tables, the following notation us used.
- CAPITALS = stick, miniscules = touchpad
- ?'s can have different meanings on different models, such as wheel rotation,
- extra buttons, stick buttons on a dualpoint, etc.
- PS/2 packet format
- ------------------
- byte 0: 0 0 YSGN XSGN 1 M R L
- byte 1: X7 X6 X5 X4 X3 X2 X1 X0
- byte 2: Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
- Note that the device never signals overflow condition.
- ALPS Absolute Mode - Old Format
- -------------------------------
- byte 0: 1 0 0 0 1 x9 x8 x7
- byte 1: 0 x6 x5 x4 x3 x2 x1 x0
- byte 2: 0 ? ? l r ? fin ges
- byte 3: 0 ? ? ? ? y9 y8 y7
- byte 4: 0 y6 y5 y4 y3 y2 y1 y0
- byte 5: 0 z6 z5 z4 z3 z2 z1 z0
- ALPS Absolute Mode - New Format
- -------------------------------
- byte 0: 1 ? ? ? 1 ? ? ?
- byte 1: 0 x6 x5 x4 x3 x2 x1 x0
- byte 2: 0 x10 x9 x8 x7 ? fin ges
- byte 3: 0 y9 y8 y7 1 M R L
- byte 4: 0 y6 y5 y4 y3 y2 y1 y0
- byte 5: 0 z6 z5 z4 z3 z2 z1 z0
- Dualpoint device -- interleaved packet format
- ---------------------------------------------
- byte 0: 1 1 0 0 1 1 1 1
- byte 1: 0 x6 x5 x4 x3 x2 x1 x0
- byte 2: 0 x10 x9 x8 x7 0 fin ges
- byte 3: 0 0 YSGN XSGN 1 1 1 1
- byte 4: X7 X6 X5 X4 X3 X2 X1 X0
- byte 5: Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
- byte 6: 0 y9 y8 y7 1 m r l
- byte 7: 0 y6 y5 y4 y3 y2 y1 y0
- byte 8: 0 z6 z5 z4 z3 z2 z1 z0
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