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