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Input: alps - only Dell laptops have separate button bits for v2 dualpoint sticks

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It turns out that only Dell laptops have the separate button bits for
v2 dualpoint sticks and that commit 92bac83dd7 ("Input: alps - non
interleaved V2 dualpoint has separate stick button bits") causes
regressions on Toshiba laptops.

This commit adds a check for Dell laptops to the code for handling these
extra button bits, fixing this regression.

This patch has been tested on a Dell Latitude D620 to make sure that it
does not reintroduce the original problem.

Reported-and-tested-by: Douglas Christman <douglaschristman@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Hans de Goede
2015-08-03 14:06:24 -07:00
committed by Dmitry Torokhov
parent b6e26546cc
commit 073e570d7c
2 changed files with 10 additions and 4 deletions
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6
Documentation/input/alps.txt
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@@ -119,8 +119,10 @@ 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. For non interleaved dualpoint devices the pointingstick
buttons get reported separately in the PSM, PSR and PSL bits.
the DualPoint Stick. The M, R and L bits signal the combined status of both
the pointingstick and touchpad buttons, except for Dell dualpoint devices
where the pointingstick buttons get reported separately in the PSM, PSR
and PSL bits.
Dualpoint device -- interleaved packet format
---------------------------------------------