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authorHans de Goede <hdegoede@redhat.com>2015-04-15 10:48:32 -0700
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2015-04-15 10:52:49 -0700
commit2310568f570e0f95bfb1cc79ff7db617e782e25c (patch)
treeaa38c517231b0ec4a69cb1995ea3f1f3d2cc7354 /Documentation/input
parent4f8d808889d05807f494f82f8cfaa6c113c2f761 (diff)
Input: alps - document separate pointstick button bits for V2 devices
Non interleaved dualpoint v2 devices have separate pointstick button bits, document this. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'Documentation/input')
-rw-r--r--Documentation/input/alps.txt9
1 files changed, 7 insertions, 2 deletions
diff --git a/Documentation/input/alps.txt b/Documentation/input/alps.txt
index 92ae734c00c3..e301887d8523 100644
--- a/Documentation/input/alps.txt
+++ b/Documentation/input/alps.txt
@@ -94,6 +94,10 @@ PS/2 packet format
Note that the device never signals overflow condition.
+For protocol version 2 devices when the trackpoint is used, and no fingers
+are on the touchpad, the M R L bits signal the combined status of both the
+pointingstick and touchpad buttons.
+
ALPS Absolute Mode - Protocol Version 1
--------------------------------------
@@ -107,7 +111,7 @@ ALPS Absolute Mode - Protocol Version 1
ALPS Absolute Mode - Protocol Version 2
---------------------------------------
- byte 0: 1 ? ? ? 1 ? ? ?
+ byte 0: 1 ? ? ? 1 PSM PSR PSL
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
@@ -115,7 +119,8 @@ ALPS Absolute Mode - Protocol Version 2
byte 5: 0 z6 z5 z4 z3 z2 z1 z0
Protocol Version 2 DualPoint devices send standard PS/2 mouse packets for
-the DualPoint Stick.
+the DualPoint Stick. For non interleaved dualpoint devices the pointingstick
+buttons get reported separately in the PSM, PSR and PSL bits.
Dualpoint device -- interleaved packet format
---------------------------------------------