From 257867dc8d893690c175c1f717f91c3b6d44a63d Mon Sep 17 00:00:00 2001 From: Peter Hutterer Date: Fri, 31 May 2013 16:29:44 +1000 Subject: 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 Acked-by: Benjamin Tissoires Signed-off-by: Henrik Rydberg --- Documentation/input/multi-touch-protocol.txt | 2 ++ 1 file changed, 2 insertions(+) (limited to 'Documentation/input') 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 ------------------ -- cgit v1.2.1