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