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# Copyright 2015-present Facebook. All Rights Reserved.
#
# This program file is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program in a file named COPYING; if not, write to the
# Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301 USA
DEVMEM=/sbin/devmem
SHADOW_GPIO=/tmp/gpionames
devmem_set_bit() {
local addr
local val
addr=$1
val=$($DEVMEM $addr)
val=$((val | (0x1 << $2)))
$DEVMEM $addr 32 $val
}
devmem_clear_bit() {
local addr
local val
addr=$1
val=$($DEVMEM $addr)
val=$((val & ~(0x1 << $2)))
$DEVMEM $addr 32 $val
}
GPIODIR="/sys/class/gpio"
GPIOEXPORT="$GPIODIR/export"
gpio_dir() {
echo "$GPIODIR/gpio$1"
}
gpio_name2value() {
local first remaining base val
remaining=$1
base="${SHADOW_GPIO}/${remaining}"
if [ -L "${base}" ]; then
val=$(readlink -f ${base} 2>/dev/null)
if [ -n "${val}" ]; then
val=${val##*gpio}
if [ -n "${val}" ]; then
echo "$val"
return
fi
fi
fi
val=0
while [ -n "$remaining" ]; do
first=${remaining:0:1}
case "$first" in
[[:lower:]])
base=$(printf "%d" "'$first'")
base=$((base - 96))
val=$((val * 26 + base))
;;
[[:upper:]])
base=$(printf "%d" "'$first'")
base=$((base - 64))
val=$((val * 26 + base))
;;
*)
if [ $val -gt 0 ]; then
val=$((val-1))
fi
val=$((val * 8 + $remaining))
break
;;
esac
remaining=${remaining:1}
done
echo "$val"
}
gpio_export() {
local gpio
gpio=$(gpio_name2value $1)
dir=$(gpio_dir $gpio)
if [ ! -d ${dir} ]; then
echo $gpio > $GPIOEXPORT
fi
if [ $# -gt 1 ]; then
if [ ! -d $SHADOW_GPIO ]; then
mkdir -p $SHADOW_GPIO
fi
ln -s $dir $SHADOW_GPIO/$2
fi
}
gpio_set() {
local gpio
local val
gpio=$(gpio_name2value $1)
val=$2
dir=$(gpio_dir $gpio)
if [ ! -d ${dir} ]; then
echo $gpio > $GPIOEXPORT
fi
echo $val > ${dir}/value
echo out > ${dir}/direction
}
gpio_get() {
local gpio
local val
gpio=$(gpio_name2value $1)
dir=$(gpio_dir $gpio)
if [ ! -d ${dir} ]; then
echo $gpio > $GPIOEXPORT
fi
echo in > ${dir}/direction
cat ${dir}/value
}
if [ -f "/usr/local/bin/soc-utils.sh" ]; then
source "/usr/local/bin/soc-utils.sh"
fi
if [ -f "/usr/local/bin/board-utils.sh" ]; then
source "/usr/local/bin/board-utils.sh"
fi
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