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Input: docs - note that MT-A protocol is obsolete

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Everyone should be using multitouch protocol B (slotted) now.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Dmitry Torokhov 2017-04-06 17:23:39 -07:00
parent 4c79e98be5
commit 6c6d5752da
1 changed files with 3 additions and 3 deletions
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6
Documentation/input/multi-touch-protocol.rst
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@ -22,6 +22,9 @@ describes how to send the raw data for all contacts to the receiver. For
devices capable of tracking identifiable contacts (type B), the protocol devices capable of tracking identifiable contacts (type B), the protocol
describes how to send updates for individual contacts via event slots. describes how to send updates for individual contacts via event slots.
.. note::
MT potocol type A is obsolete, all kernel drivers have been
converted to use type B.
Protocol Usage Protocol Usage
-------------- --------------
@ -400,9 +403,6 @@ in a finger packet must not be recognized as single-touch events.
For type A devices, all finger data bypasses input filtering, since For type A devices, all finger data bypasses input filtering, since
subsequent events of the same type refer to different fingers. subsequent events of the same type refer to different fingers.
For example usage of the type A protocol, see the bcm5974 driver. For
example usage of the type B protocol, see the hid-egalax driver.
.. [#f1] Also, the difference (TOOL_X - POSITION_X) can be used to model tilt. .. [#f1] Also, the difference (TOOL_X - POSITION_X) can be used to model tilt.
.. [#f2] The list can of course be extended. .. [#f2] The list can of course be extended.
.. [#f3] The mtdev project: http://bitmath.org/code/mtdev/. .. [#f3] The mtdev project: http://bitmath.org/code/mtdev/.