Input: alps - document stick behavior for protocol V2

Document that protocol V2 uses standard (bare) PS/2 mouse packets for the
DualPoint stick.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-By: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

authored by Hans de Goede and committed by Dmitry Torokhov 58d8a3be e3a79212

Changed files
+8
Documentation
input
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Documentation/input/alps.txt
··· 114 114 byte 4: 0 y6 y5 y4 y3 y2 y1 y0 115 115 byte 5: 0 z6 z5 z4 z3 z2 z1 z0 116 116 117 + Protocol Version 2 DualPoint devices send standard PS/2 mouse packets for 118 + the DualPoint Stick. 119 + 117 120 Dualpoint device -- interleaved packet format 118 121 --------------------------------------------- 119 122 ··· 129 126 byte 6: 0 y9 y8 y7 1 m r l 130 127 byte 7: 0 y6 y5 y4 y3 y2 y1 y0 131 128 byte 8: 0 z6 z5 z4 z3 z2 z1 z0 129 + 130 + Devices which use the interleaving format normally send standard PS/2 mouse 131 + packets for the DualPoint Stick + ALPS Absolute Mode packets for the 132 + touchpad, switching to the interleaved packet format when both the stick and 133 + the touchpad are used at the same time. 132 134 133 135 ALPS Absolute Mode - Protocol Version 3 134 136 ---------------------------------------