[meta-intel] [PATCH V4 1/1] formfactor: detect USB HID keyboard and touch screen
Jianxun Zhang
jianxun.zhang at linux.intel.com
Thu Jun 23 17:05:21 PDT 2016
The new machconfig probes USB keyboard and touch screen, and
then sets HAVE_* variables according to detection.
Detectable devices:
USB HID keyboards (Generic Desktop)
USB HID touch screens (Digitizer)
Note:
The intention is to have a way to provide initial formfactor
settings in a boot procedure. That means supported keyboard
and touch screen must be connected before machconfig runs.
Any new connection or disconnection won't be detected until
machconfig is executed again.
Limitation:
There could be some USB HID devices presents more than one
usage in a single descriptor. We will add support once such
device emerges.
Some platforms may have _virtual_ devices provided by BIOS.
It will cause false detection when they are presented as
types we supported. We can add black list logic when it
becomes a big concern.
Fixes [YOCTO #9205]
Signed-off-by: Jianxun Zhang <jianxun.zhang at linux.intel.com>
---
Just get a hand on this patch. V4 checks the existing of usbhid-command first.
Same test done on NUC 6 and X220 as before.
Let me know if this address feedbacks to previous versions.
.../recipes-bsp/formfactor/formfactor/machconfig | 39 ++++++++++++++++++++++
.../recipes-bsp/formfactor/formfactor_0.0.bbappend | 1 +
2 files changed, 40 insertions(+)
create mode 100644 common/recipes-bsp/formfactor/formfactor/machconfig
create mode 100644 common/recipes-bsp/formfactor/formfactor_0.0.bbappend
diff --git a/common/recipes-bsp/formfactor/formfactor/machconfig b/common/recipes-bsp/formfactor/formfactor/machconfig
new file mode 100644
index 0000000..b5222b8
--- /dev/null
+++ b/common/recipes-bsp/formfactor/formfactor/machconfig
@@ -0,0 +1,39 @@
+# Note: super user permission is required to run usbhid-dump
+# successfully.
+
+# HEX keys are according to USB HID spec and USB HID usage table
+# We could add more keys as needed in the future.
+
+# It may not be very accurate. Here we only look for first two lines
+# of a descriptor section. Example:
+#
+# 001:003:000:DESCRIPTOR 1460501386.337809
+# 05 01 09 02 A1 01 09 01 A1 00 05 09 19 01 29 03
+# 15 00 25 01 95 03 75 01 81 02 .. .. .. .. .. ..
+# .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..
+#
+# By doing so we elimiate false matches when HEX keys are in the lines
+# in the middle of whole descriptor section.
+
+if type usbhid-dump &>/dev/null; then
+ if USBHID_DUMP_OUTPUT=$(usbhid-dump -e descriptor 2>/dev/null|grep -A1 DESCRIPTOR); then
+ # checker for generic USB HID keyboard
+ USBHID_KBD_CMD="grep -E '^ 05 01 09 06'"
+
+ # checker for touch screen
+ USBHID_TS_CMD="grep -E '^ 05 0D 09 04'"
+
+ if echo "$USBHID_DUMP_OUTPUT"|eval $USBHID_TS_CMD &>/dev/null; then
+ HAVE_TOUCHSCREEN=1
+ fi
+
+ if echo "$USBHID_DUMP_OUTPUT"|eval $USBHID_KBD_CMD &>/dev/null; then
+ HAVE_KEYBOARD=1
+ else
+ # config script in OE will set HAVE_KEYBOARD=1
+ # if we don't set any value. We have to explicitly
+ # tell it when keyboard is not detected.
+ HAVE_KEYBOARD=0
+ fi
+ fi
+fi
diff --git a/common/recipes-bsp/formfactor/formfactor_0.0.bbappend b/common/recipes-bsp/formfactor/formfactor_0.0.bbappend
new file mode 100644
index 0000000..72d991c
--- /dev/null
+++ b/common/recipes-bsp/formfactor/formfactor_0.0.bbappend
@@ -0,0 +1 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
--
2.7.4
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