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| author | Peter Hutterer <peter.hutterer@who-t.net> | 2013-05-31 16:29:44 +1000 |
|---|---|---|
| committer | Henrik Rydberg <rydberg@euromail.se> | 2013-06-13 21:32:00 +0200 |
| commit | 257867dc8d893690c175c1f717f91c3b6d44a63d (patch) | |
| tree | ef3f2404177a832d1cb1440179ed27f9788e7c63 /Documentation | |
| parent | 317ddd256b9c24b0d78fa8018f80f1e495481a10 (diff) | |
| download | linux-257867dc8d893690c175c1f717f91c3b6d44a63d.tar.gz linux-257867dc8d893690c175c1f717f91c3b6d44a63d.tar.xz | |
Input: MT - Specify that ABS_MT_SLOT must have a minimum of 0
This is effectively already in force through input_mt_init_slots, and uinput
too ignores the actual minimum.
Since slots are a kernel-genenerated axis only, non-zero minimums make
little sense and are likely to cause errors. Better to treat a non-zero
minimum as kernel bug if it ever happens.
Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
Acked-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/input/multi-touch-protocol.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/input/multi-touch-protocol.txt b/Documentation/input/multi-touch-protocol.txt index 2c179613f81b..de139b18184a 100644 --- a/Documentation/input/multi-touch-protocol.txt +++ b/Documentation/input/multi-touch-protocol.txt @@ -80,6 +80,8 @@ Userspace can detect that a driver can report more total contacts than slots by noting that the largest supported BTN_TOOL_*TAP event is larger than the total number of type B slots reported in the absinfo for the ABS_MT_SLOT axis. +The minimum value of the ABS_MT_SLOT axis must be 0. + Protocol Example A ------------------ |