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| author | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-04-14 08:21:38 +0200 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2010-04-14 08:21:38 +0200 |
| commit | 56f3e1c0579cd06196d51ebd1ccad9298c5426b3 (patch) | |
| tree | cacccdde5f6fb5c9e734977306fb1b73ef33ea03 /Documentation | |
| parent | Linux 2.6.34-rc4 (diff) | |
| parent | Input: wacom - switch mode upon system resume (diff) | |
| download | linux-56f3e1c0579cd06196d51ebd1ccad9298c5426b3.tar.xz linux-56f3e1c0579cd06196d51ebd1ccad9298c5426b3.zip | |
Merge branch 'for-linus' into next
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/input/multi-touch-protocol.txt | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/Documentation/input/multi-touch-protocol.txt b/Documentation/input/multi-touch-protocol.txt index 8490480ce432..c0fc1c75fd88 100644 --- a/Documentation/input/multi-touch-protocol.txt +++ b/Documentation/input/multi-touch-protocol.txt @@ -68,6 +68,22 @@ like: SYN_MT_REPORT SYN_REPORT +Here is the sequence after lifting one of the fingers: + + ABS_MT_POSITION_X + ABS_MT_POSITION_Y + SYN_MT_REPORT + SYN_REPORT + +And here is the sequence after lifting the remaining finger: + + SYN_MT_REPORT + SYN_REPORT + +If the driver reports one of BTN_TOUCH or ABS_PRESSURE in addition to the +ABS_MT events, the last SYN_MT_REPORT event may be omitted. Otherwise, the +last SYN_REPORT will be dropped by the input core, resulting in no +zero-finger event reaching userland. Event Semantics --------------- @@ -217,11 +233,6 @@ where examples can be found. difference between the contact position and the approaching tool position could be used to derive tilt. [2] The list can of course be extended. -[3] The multi-touch X driver is currently in the prototyping stage. At the -time of writing (April 2009), the MT protocol is not yet merged, and the -prototype implements finger matching, basic mouse support and two-finger -scrolling. The project aims at improving the quality of current multi-touch -functionality available in the Synaptics X driver, and in addition -implement more advanced gestures. +[3] Multitouch X driver project: http://bitmath.org/code/multitouch/. [4] See the section on event computation. [5] See the section on finger tracking. |