From d95a9b516861594bc89c7ee8079bab2904703ad2 Mon Sep 17 00:00:00 2001 From: Chase Maupin Date: Mon, 14 Oct 2013 15:20:01 -0500 Subject: udev: update local rules for new touchscreen device * While working with a new capacitive touchscreen it was found that the existing udev rule that creates the /dev/input/touchscreen0 symlink was too restrictive and did not match the MODALAIS entry for this touchscreen. which is: MODALIAS=input:b0018v0000p0000e0000-e0,1,3,k14A,ra0,1,2F,35,36,39,mlsfw * By looking at the input_print_modalias function in the Linux kernel drivers/input/input.c file and referencing the meaning of the evbits and attributes of the input_dev structure it seems that for identification of a touchscreen the match with ,18 which was matching part of the absbit structure is overkill. * It seems that the absbit entry is used for devices like touchscreens and if that the the "a" is followed by 0 and 1 this is sufficient. * So the logic has now been changed to check for the "e" 0 and 3 values which correspond to EV_SYN and EV_ABS, then check for the "a" attribute with 0 and 1. * More information and history for this can be found at: http://patchwork.openembedded.org/patch/25093/ http://thread.gmane.org/gmane.comp.handhelds.openembedded.core * This patch mirrors a patch done by: Andrea Adami Signed-off-by: Chase Maupin Signed-off-by: Saul Wold --- meta/recipes-core/udev/udev/local.rules | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'meta/recipes-core') diff --git a/meta/recipes-core/udev/udev/local.rules b/meta/recipes-core/udev/udev/local.rules index 72d92ef627..d0cbf91b60 100644 --- a/meta/recipes-core/udev/udev/local.rules +++ b/meta/recipes-core/udev/udev/local.rules @@ -17,5 +17,7 @@ ACTION=="add", DEVPATH=="/devices/*", ENV{MODALIAS}=="?*", RUN+="/sbin/modprobe $env{MODALIAS}" # Create a symlink to any touchscreen input device -SUBSYSTEM=="input", KERNEL=="event[0-9]*", ATTRS{modalias}=="input:*-e0*,3,*a0,1,*18,*", SYMLINK+="input/touchscreen0" +# Trigger based on input type, that the evbit (-e) has EV_SYN and EV_ABS, +# has an EV_ABS value (-a) which is used for touchscreen type devices. +SUBSYSTEM=="input", KERNEL=="event[0-9]*", ATTRS{modalias}=="input:*-e0*,3,*a0,1,*", SYMLINK+="input/touchscreen0" -- cgit 1.2.3-korg