[oe-commits] Chase Maupin : udev: update local rules for new touchscreen device
git at git.openembedded.org
git at git.openembedded.org
Fri Oct 18 14:36:01 UTC 2013
Module: openembedded-core.git
Branch: master
Commit: d95a9b516861594bc89c7ee8079bab2904703ad2
URL: http://git.openembedded.org/?p=openembedded-core.git&a=commit;h=d95a9b516861594bc89c7ee8079bab2904703ad2
Author: Chase Maupin <Chase.Maupin at ti.com>
Date: Mon Oct 14 15:20:01 2013 -0500
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 <andrea.adami at gmail.com>
Signed-off-by: Chase Maupin <Chase.Maupin at ti.com>
Signed-off-by: Saul Wold <sgw at linux.intel.com>
---
meta/recipes-core/udev/udev/local.rules | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/meta/recipes-core/udev/udev/local.rules b/meta/recipes-core/udev/udev/local.rules
index 72d92ef..d0cbf91 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"
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