1 2# SPDX-License-Identifier: GPL-2.0 3 4# Overrides functions in gpio-mockup.sh to test using the GPIO SYSFS uAPI 5 6SYSFS=`grep -w sysfs /proc/mounts | cut -f2 -d' '` 7[ -d "$SYSFS" ] || skip "sysfs is not mounted" 8 9GPIO_SYSFS="${SYSFS}/class/gpio" 10[ -d "$GPIO_SYSFS" ] || skip "CONFIG_GPIO_SYSFS is not selected" 11 12PLATFORM_SYSFS=$SYSFS/devices/platform 13 14sysfs_nr= 15sysfs_ldir= 16 17# determine the sysfs GPIO number given the $chip and $offset 18# e.g. gpiochip1:32 19find_sysfs_nr() 20{ 21 # e.g. /sys/devices/platform/gpio-mockup.1/gpiochip1 22 local platform=$(find $PLATFORM_SYSFS -mindepth 2 -maxdepth 2 -type d -name $chip) 23 [ "$platform" ] || fail "can't find platform of $chip" 24 # e.g. /sys/devices/platform/gpio-mockup.1/gpio/gpiochip508/base 25 local base=$(find ${platform%/*}/gpio/ -mindepth 2 -maxdepth 2 -type f -name base) 26 [ "$base" ] || fail "can't find base of $chip" 27 sysfs_nr=$(($(< "$base") + $offset)) 28 sysfs_ldir="$GPIO_SYSFS/gpio$sysfs_nr" 29} 30 31acquire_line() 32{ 33 [ "$sysfs_nr" ] && return 34 find_sysfs_nr 35 echo "$sysfs_nr" > "$GPIO_SYSFS/export" 36} 37 38# The helpers being overridden... 39get_line() 40{ 41 [ -e "$sysfs_ldir/value" ] && echo $(< "$sysfs_ldir/value") 42} 43 44set_line() 45{ 46 acquire_line 47 48 for option in $*; do 49 case $option in 50 active-high) 51 echo 0 > "$sysfs_ldir/active_low" 52 ;; 53 active-low) 54 echo 1 > "$sysfs_ldir/active_low" 55 ;; 56 input) 57 echo "in" > "$sysfs_ldir/direction" 58 ;; 59 0) 60 echo "out" > "$sysfs_ldir/direction" 61 echo 0 > "$sysfs_ldir/value" 62 ;; 63 1) 64 echo "out" > "$sysfs_ldir/direction" 65 echo 1 > "$sysfs_ldir/value" 66 ;; 67 esac 68 done 69} 70 71release_line() 72{ 73 [ "$sysfs_nr" ] || return 0 74 echo "$sysfs_nr" > "$GPIO_SYSFS/unexport" 75 sysfs_nr= 76 sysfs_ldir= 77} 78