Merge branch 'github-pull-38'

Add guess module to detect modules for touchscreen devices.

Link: #38
Signed-off-by: Alexey Gladkov <[email protected]>

Author: legionus

guess/touchscreen/README.md

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+# Guess module: touchscreen
+
+This module tries to guess modules for touchscreen devices.
+
+Touchscreen modules may be necessary, for example, if you
+need to enter a password to unlock an encrypted mobile device.

guess/touchscreen/action

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+#!/bin/bash -eu
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+. guess-functions
+
+$TRACE_SOURCE "Processing ..."
+
+# The idea comes from tslib. Touchscreen devices have
+# the INPUT_PROP_DIRECT property, which is determined
+# by the first from zero bit of the property number
+
+INPUT_PROP_DIRECT=1
+bitmask=$((1 << $INPUT_PROP_DIRECT))
+
+for i in "$SYSFS_PATH"/class/input/event*/device/properties; do
+	[ -f "$i" ] ||
+		continue
+
+	readline prop "$i"
+
+	(($prop & $bitmask)) ||
+		continue
+
+	p="$(readlink -e "$i")"
+
+	while [ "$p" != "$SYSFS_PATH"/devices ]; do
+		if [ -f "$p"/modalias ]; then
+			readline alias "$p"/modalias
+			guess_modalias "$alias"
+		fi
+		p="${p%/*}"
+	done
+done

guess/touchscreen/rules.mk

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+# SPDX-License-Identifier: GPL-3.0-or-later
+.PHONY: guess-touchscreen
+
+guess-touchscreen:
+	$V echo "Processing $@ ..."
+	@ GUESS_SUFFIX=rescue:$@ \
+	    $(DETECTDIR)/touchscreen/action
+
+guess: guess-touchscreen