name : gpio-mockup-sysfs.sh # SPDX-License-Identifier: GPL-2.0 # Overrides functions in gpio-mockup.sh to test using the GPIO SYSFS uAPI SYSFS=`grep -w sysfs /proc/mounts | cut -f2 -d' '` [ -d "$SYSFS" ] || skip "sysfs is not mounted" GPIO_SYSFS="${SYSFS}/class/gpio" [ -d "$GPIO_SYSFS" ] || skip "CONFIG_GPIO_SYSFS is not selected" PLATFORM_SYSFS=$SYSFS/devices/platform sysfs_nr= sysfs_ldir= # determine the sysfs GPIO number given the $chip and $offset # e.g. gpiochip1:32 find_sysfs_nr() { # e.g. /sys/devices/platform/gpio-mockup.1/gpiochip1 local platform=$(find $PLATFORM_SYSFS -mindepth 2 -maxdepth 2 -type d -name $chip) [ "$platform" ] || fail "can't find platform of $chip" # e.g. /sys/devices/platform/gpio-mockup.1/gpio/gpiochip508/base local base=$(find ${platform%/*}/gpio/ -mindepth 2 -maxdepth 2 -type f -name base) [ "$base" ] || fail "can't find base of $chip" sysfs_nr=$(($(< "$base") + $offset)) sysfs_ldir="$GPIO_SYSFS/gpio$sysfs_nr" } acquire_line() { [ "$sysfs_nr" ] && return find_sysfs_nr echo "$sysfs_nr" > "$GPIO_SYSFS/export" } # The helpers being overridden... get_line() { [ -e "$sysfs_ldir/value" ] && echo $(< "$sysfs_ldir/value") } set_line() { acquire_line for option in $*; do case $option in active-high) echo 0 > "$sysfs_ldir/active_low" ;; active-low) echo 1 > "$sysfs_ldir/active_low" ;; input) echo "in" > "$sysfs_ldir/direction" ;; 0) echo "out" > "$sysfs_ldir/direction" echo 0 > "$sysfs_ldir/value" ;; 1) echo "out" > "$sysfs_ldir/direction" echo 1 > "$sysfs_ldir/value" ;; esac done } release_line() { [ "$sysfs_nr" ] || return 0 echo "$sysfs_nr" > "$GPIO_SYSFS/unexport" sysfs_nr= sysfs_ldir= }