Quelle  gpio-aggregator.sh   Sprache: Shell

#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# Copyright (C) 2025 Bartosz Golaszewski <brgl@bgdev.pl>
# Copyright (C) 2025 Koichiro Den <koichiro.den@canonical.com>

BASE_DIR=$(dirname "$0")
CONFIGFS_SIM_DIR="/sys/kernel/config/gpio-sim"
CONFIGFS_AGG_DIR="/sys/kernel/config/gpio-aggregator"
SYSFS_AGG_DIR="/sys/bus/platform/drivers/gpio-aggregator"
MODULE="gpio-aggregator"

fail() {
 echo "$*" >&2
 echo "GPIO $MODULE test FAIL"
 exit 1
}

skip() {
 echo "$*" >&2
 echo "GPIO $MODULE test SKIP"
 exit 4
}

# gpio-sim
sim_enable_chip() {
 local CHIP=$1

 echo 1 > "$CONFIGFS_SIM_DIR/$CHIP/live" || fail "Unable to enable the chip"
}

sim_disable_chip() {
 local CHIP=$1

 echo 0 > "$CONFIGFS_SIM_DIR/$CHIP/live" || fail "Unable to disable the chip"
}

sim_configfs_cleanup() {
 local NOCHECK=${1:-0}

 for CHIP_DIR in "$CONFIGFS_SIM_DIR"/*; do
  [ -d "$CHIP_DIR" ] || continue
  echo 0 > "$CHIP_DIR/live"
  find "$CHIP_DIR" -depth -type d -exec rmdir {} \;
 done
 [ "$NOCHECK" -eq 1 ] && return;
 remaining=$(find "$CONFIGFS_SIM_DIR" -mindepth 1 -type d 2> /dev/null)
 if [ -n "$remaining" ]; then
  fail "Directories remain in $CONFIGFS_SIM_DIR: $remaining"
 fi
}

sim_get_chip_label() {
 local CHIP=$1
 local BANK=$2
 local CHIP_NAME=$(cat "$CONFIGFS_SIM_DIR/$CHIP/$BANK/chip_name" 2> /dev/null) || \
  fail "Unable to read the chip name from configfs"

 $BASE_DIR/gpio-chip-info "/dev/$CHIP_NAME" label || \
  fail "Unable to read the chip label from the character device"
}

# gpio-aggregator
agg_create_chip() {
 local CHIP=$1

 mkdir "$CONFIGFS_AGG_DIR/$CHIP"
}

agg_remove_chip() {
 local CHIP=$1

 find "$CONFIGFS_AGG_DIR/$CHIP/" -depth -type d -exec rmdir {} \; || \
  fail "Unable to remove $CONFIGFS_AGG_DIR/$CHIP"
}

agg_create_line() {
 local CHIP=$1
 local LINE=$2

 mkdir "$CONFIGFS_AGG_DIR/$CHIP/$LINE"
}

agg_remove_line() {
 local CHIP=$1
 local LINE=$2

 rmdir "$CONFIGFS_AGG_DIR/$CHIP/$LINE"
}

agg_set_key() {
 local CHIP=$1
 local LINE=$2
 local KEY=$3

 echo "$KEY" > "$CONFIGFS_AGG_DIR/$CHIP/$LINE/key" || fail "Unable to set the lookup key"
}

agg_set_offset() {
 local CHIP=$1
 local LINE=$2
 local OFFSET=$3

 echo "$OFFSET" > "$CONFIGFS_AGG_DIR/$CHIP/$LINE/offset" || \
  fail "Unable to set the lookup offset"
}

agg_set_line_name() {
 local CHIP=$1
 local LINE=$2
 local NAME=$3

 echo "$NAME" > "$CONFIGFS_AGG_DIR/$CHIP/$LINE/name" || fail "Unable to set the line name"
}

agg_enable_chip() {
 local CHIP=$1

 echo 1 > "$CONFIGFS_AGG_DIR/$CHIP/live" || fail "Unable to enable the chip"
}

agg_disable_chip() {
 local CHIP=$1

 echo 0 > "$CONFIGFS_AGG_DIR/$CHIP/live" || fail "Unable to disable the chip"
}

agg_configfs_cleanup() {
 local NOCHECK=${1:-0}

 for CHIP_DIR in "$CONFIGFS_AGG_DIR"/*; do
  [ -d "$CHIP_DIR" ] || continue
  echo 0 > "$CHIP_DIR/live" 2> /dev/null
  find "$CHIP_DIR" -depth -type d -exec rmdir {} \;
 done
 [ "$NOCHECK" -eq 1 ] && return;
 remaining=$(find "$CONFIGFS_AGG_DIR" -mindepth 1 -type d 2> /dev/null)
 if [ -n "$remaining" ]; then
  fail "Directories remain in $CONFIGFS_AGG_DIR: $remaining"
 fi
}

agg_configfs_dev_name() {
 local CHIP=$1

 cat "$CONFIGFS_AGG_DIR/$CHIP/dev_name" 2> /dev/null || \
  fail "Unable to read the device name from configfs"
}

agg_configfs_chip_name() {
 local CHIP=$1
 local DEV_NAME=$(agg_configfs_dev_name "$CHIP")
 local CHIP_LIST=$(find "/sys/devices/platform/$DEV_NAME" \
  -maxdepth 1 -type d -name "gpiochip[0-9]*" 2> /dev/null)
 local CHIP_COUNT=$(echo "$CHIP_LIST" | wc -l)

 if [ -z "$CHIP_LIST" ]; then
  fail "No gpiochip in /sys/devices/platform/$DEV_NAME/"
 elif [ "$CHIP_COUNT" -ne 1 ]; then
  fail "Multiple gpiochips unexpectedly found: $CHIP_LIST"
 fi
 basename "$CHIP_LIST"
}

agg_get_chip_num_lines() {
 local CHIP=$1
 local N_DIR=$(ls -d $CONFIGFS_AGG_DIR/$CHIP/line[0-9]* 2> /dev/null | wc -l)
 local N_LINES

 if [ "$(cat $CONFIGFS_AGG_DIR/$CHIP/live)" = 0 ]; then
  echo "$N_DIR"
 else
  N_LINES=$(
   $BASE_DIR/gpio-chip-info \
    "/dev/$(agg_configfs_chip_name "$CHIP")" num-lines
  ) || fail "Unable to read the number of lines from the character device"
  if [ $N_DIR != $N_LINES ]; then
   fail "Discrepancy between two sources for the number of lines"
  fi
  echo "$N_LINES"
 fi
}

agg_get_chip_label() {
 local CHIP=$1

 $BASE_DIR/gpio-chip-info "/dev/$(agg_configfs_chip_name "$CHIP")" label || \
  fail "Unable to read the chip label from the character device"
}

agg_get_line_name() {
 local CHIP=$1
 local OFFSET=$2
 local NAME_CONFIGFS=$(cat "$CONFIGFS_AGG_DIR/$CHIP/line${OFFSET}/name")
 local NAME_CDEV

 if [ "$(cat "$CONFIGFS_AGG_DIR/$CHIP/live")" = 0 ]; then
  echo "$NAME_CONFIGFS"
 else
  NAME_CDEV=$(
   $BASE_DIR/gpio-line-name \
    "/dev/$(agg_configfs_chip_name "$CHIP")" "$OFFSET"
  ) || fail "Unable to read the line name from the character device"
  if [ "$NAME_CONFIGFS" != "$NAME_CDEV" ]; then
   fail "Discrepancy between two sources for the name of line"
  fi
  echo "$NAME_CDEV"
 fi
}


# Load the modules. This will pull in configfs if needed too.
modprobe gpio-sim || skip "unable to load the gpio-sim module"
modprobe gpio-aggregator || skip "unable to load the gpio-aggregator module"

# Make sure configfs is mounted at /sys/kernel/config. Wait a bit if needed.
for IDX in $(seq 5); do
 if [ "$IDX" -eq "5" ]; then
  skip "configfs not mounted at /sys/kernel/config"
 fi

 mountpoint -q /sys/kernel/config && break
 sleep 0.1
done

# If the module was already loaded: remove all previous chips
agg_configfs_cleanup
sim_configfs_cleanup

trap "exit 1" SIGTERM SIGINT
trap "agg_configfs_cleanup 1; sim_configfs_cleanup 1" EXIT

# Use gpio-sim chips as the test backend
for CHIP in $(seq -f "chip%g" 0 1); do
 mkdir $CONFIGFS_SIM_DIR/$CHIP
 for BANK in $(seq -f "bank%g" 0 1); do
  mkdir -p "$CONFIGFS_SIM_DIR/$CHIP/$BANK"
  echo "${CHIP}_${BANK}" > "$CONFIGFS_SIM_DIR/$CHIP/$BANK/label" || \
   fail "unable to set the chip label"
  echo 16 > "$CONFIGFS_SIM_DIR/$CHIP/$BANK/num_lines" || \
   fail "unable to set the number of lines"
  for IDX in $(seq 0 15); do
   LINE_NAME="${CHIP}${BANK}_${IDX}"
   LINE_DIR="$CONFIGFS_SIM_DIR/$CHIP/$BANK/line$IDX"
   mkdir -p $LINE_DIR
   echo "$LINE_NAME" > "$LINE_DIR/name" || fail "unable to set the line name"
  done
 done
 sim_enable_chip "$CHIP"
done

echo "1. GPIO aggregator creation/deletion"

echo "1.1. Creation/deletion via configfs"

echo "1.1.1. Minimum creation/deletion"
agg_create_chip   agg0
agg_create_line   agg0 line0
agg_set_key       agg0 line0 "$(sim_get_chip_label chip0 bank0)"
agg_set_offset    agg0 line0 5
agg_set_line_name agg0 line0 test0
agg_enable_chip   agg0
test "$(cat "$CONFIGFS_AGG_DIR/agg0/live")" = 1 || fail "chip unexpectedly dead"
test "$(agg_get_chip_label agg0)" = "$(agg_configfs_dev_name agg0)" || \
 fail "label is inconsistent"
test "$(agg_get_chip_num_lines agg0)" = "1" || fail "number of lines is not 1"
test "$(agg_get_line_name agg0 0)" = "test0" || fail "line name is unset"
agg_disable_chip  agg0
agg_remove_line   agg0 line0
agg_remove_chip   agg0

echo "1.1.2. Complex creation/deletion"
agg_create_chip   agg0
agg_create_line   agg0 line0
agg_create_line   agg0 line1
agg_create_line   agg0 line2
agg_create_line   agg0 line3
agg_set_key       agg0 line0 "$(sim_get_chip_label chip0 bank0)"
agg_set_key       agg0 line1 "$(sim_get_chip_label chip0 bank1)"
agg_set_key       agg0 line2 "$(sim_get_chip_label chip1 bank0)"
agg_set_key       agg0 line3 "$(sim_get_chip_label chip1 bank1)"
agg_set_offset    agg0 line0 1
agg_set_offset    agg0 line1 3
agg_set_offset    agg0 line2 5
agg_set_offset    agg0 line3 7
agg_set_line_name agg0 line0 test0
agg_set_line_name agg0 line1 test1
agg_set_line_name agg0 line2 test2
agg_set_line_name agg0 line3 test3
agg_enable_chip   agg0
test "$(cat "$CONFIGFS_AGG_DIR/agg0/live")" = 1 || fail "chip unexpectedly dead"
test "$(agg_get_chip_label agg0)" = "$(agg_configfs_dev_name agg0)" || \
 fail "label is inconsistent"
test "$(agg_get_chip_num_lines agg0)" = "4" || fail "number of lines is not 1"
test "$(agg_get_line_name agg0 0)" = "test0" || fail "line name is unset"
test "$(agg_get_line_name agg0 1)" = "test1" || fail "line name is unset"
test "$(agg_get_line_name agg0 2)" = "test2" || fail "line name is unset"
test "$(agg_get_line_name agg0 3)" = "test3" || fail "line name is unset"
agg_disable_chip  agg0
agg_remove_line   agg0 line0
agg_remove_line   agg0 line1
agg_remove_line   agg0 line2
agg_remove_line   agg0 line3
agg_remove_chip   agg0

echo "1.1.3. Can't instantiate a chip without any line"
agg_create_chip   agg0
echo 1 > "$CONFIGFS_AGG_DIR/agg0/live" 2> /dev/null && fail "chip unexpectedly enabled"
test "$(cat "$CONFIGFS_AGG_DIR/agg0/live")" = 0 || fail "chip unexpectedly alive"
agg_remove_chip   agg0

echo "1.1.4. Can't instantiate a chip with invalid configuration"
agg_create_chip   agg0
agg_create_line   agg0 line0
agg_set_key       agg0 line0 "chipX_bankX"
agg_set_offset    agg0 line0 99
agg_set_line_name agg0 line0 test0
echo 1 > "$CONFIGFS_AGG_DIR/agg0/live" 2> /dev/null && fail "chip unexpectedly enabled"
test "$(cat "$CONFIGFS_AGG_DIR/agg0/live")" = 0 || fail "chip unexpectedly alive"
agg_remove_line   agg0 line0
agg_remove_chip   agg0

echo "1.1.5. Can't instantiate a chip asynchronously via deferred probe"
agg_create_chip   agg0
agg_create_line   agg0 line0
agg_set_key       agg0 line0 "chip0_bank0"
agg_set_offset    agg0 line0 5
agg_set_line_name agg0 line0 test0
sim_disable_chip  chip0
echo 1 > "$CONFIGFS_AGG_DIR/agg0/live" 2> /dev/null && fail "chip unexpectedly enabled"
test "$(cat "$CONFIGFS_AGG_DIR/agg0/live")" = 0 || fail "chip unexpectedly alive"
sim_enable_chip   chip0
sleep 1
test "$(cat "$CONFIGFS_AGG_DIR/agg0/live")" = 0 || \
 fail "chip unexpectedly transitioned to 'live' state"
agg_remove_line   agg0 line0
agg_remove_chip   agg0

echo "1.1.6. Can't instantiate a chip with _sysfs prefix"
mkdir "$CONFIGFS_AGG_DIR/_sysfs" 2> /dev/null && fail "chip _sysfs unexpectedly created"
mkdir "$CONFIGFS_AGG_DIR/_sysfs.foo" 2> /dev/null && fail "chip _sysfs.foo unexpectedly created"

echo "1.2. Creation/deletion via sysfs"

echo "1.2.1. Minimum creation/deletion"
echo "chip0_bank0 0" > "$SYSFS_AGG_DIR/new_device"
CHIPNAME=$(agg_configfs_chip_name _sysfs.0)
test "$(cat "$CONFIGFS_AGG_DIR/_sysfs.0/live")" = 1 || fail "chip unexpectedly dead"
test "$(agg_get_chip_label _sysfs.0)" = "$(agg_configfs_dev_name _sysfs.0)" || \
 fail "label is inconsistent"
test "$(agg_get_chip_num_lines _sysfs.0)" = "1" || fail "number of lines is not 1"
test "$(agg_get_line_name _sysfs.0 0)" = "" || fail "line name is unset"
echo "$(agg_configfs_dev_name _sysfs.0)" > "$SYSFS_AGG_DIR/delete_device"
test -d $CONFIGFS_AGG_DIR/_sysfs.0 && fail "_sysfs.0 unexpectedly remains"
test -d /dev/${CHIPNAME} && fail "/dev/${CHIPNAME} unexpectedly remains"

echo "1.2.2. Complex creation/deletion"
echo "chip0bank0_0 chip1_bank1 10-11" > "$SYSFS_AGG_DIR/new_device"
CHIPNAME=$(agg_configfs_chip_name _sysfs.0)
test "$(cat "$CONFIGFS_AGG_DIR/_sysfs.0/live")" = 1 || fail "chip unexpectedly dead"
test "$(agg_get_chip_label _sysfs.0)" = "$(agg_configfs_dev_name _sysfs.0)" || \
 fail "label is inconsistent"
test "$(agg_get_chip_num_lines _sysfs.0)" = "3" || fail "number of lines is not 3"
test "$(agg_get_line_name _sysfs.0 0)" = "" || fail "line name is unset"
test "$(agg_get_line_name _sysfs.0 1)" = "" || fail "line name is unset"
test "$(agg_get_line_name _sysfs.0 2)" = "" || fail "line name is unset"
echo "$(agg_configfs_dev_name _sysfs.0)" > "$SYSFS_AGG_DIR/delete_device"
test -d $CONFIGFS_AGG_DIR/_sysfs.0 && fail "_sysfs.0 unexpectedly remains"
test -d /dev/${CHIPNAME} && fail "/dev/${CHIPNAME} unexpectedly remains"

echo "1.2.3. Asynchronous creation with deferred probe"
sim_disable_chip  chip0
echo 'chip0_bank0 0' > $SYSFS_AGG_DIR/new_device
sleep 1
test "$(cat "$CONFIGFS_AGG_DIR/_sysfs.0/live")" = 0 || fail "chip unexpectedly alive"
sim_enable_chip  chip0
sleep 1
CHIPNAME=$(agg_configfs_chip_name _sysfs.0)
test "$(cat "$CONFIGFS_AGG_DIR/_sysfs.0/live")" = 1 || fail "chip unexpectedly remains dead"
test "$(agg_get_chip_label _sysfs.0)" = "$(agg_configfs_dev_name _sysfs.0)" || \
 fail "label is inconsistent"
test "$(agg_get_chip_num_lines _sysfs.0)" = "1" || fail "number of lines is not 1"
test "$(agg_get_line_name _sysfs.0 0)" = "" || fail "line name unexpectedly set"
echo "$(agg_configfs_dev_name _sysfs.0)" > "$SYSFS_AGG_DIR/delete_device"
test -d $CONFIGFS_AGG_DIR/_sysfs.0 && fail "_sysfs.0 unexpectedly remains"
test -d /dev/${CHIPNAME} && fail "/dev/${CHIPNAME} unexpectedly remains"

echo "1.2.4. Can't instantiate a chip with invalid configuration"
echo "xyz 0" > "$SYSFS_AGG_DIR/new_device"
test "$(cat $CONFIGFS_AGG_DIR/_sysfs.0/live)" = 0 || fail "chip unexpectedly alive"
echo "$(agg_configfs_dev_name _sysfs.0)" > "$SYSFS_AGG_DIR/delete_device"

echo "2. GPIO aggregator configuration"

echo "2.1. Configuring aggregators instantiated via configfs"
setup_2_1() {
 agg_create_chip   agg0
 agg_create_line   agg0 line0
 agg_create_line   agg0 line1
 agg_set_key       agg0 line0 "$(sim_get_chip_label chip0 bank0)"
 agg_set_key       agg0 line1 "$(sim_get_chip_label chip1 bank0)"
 agg_set_offset    agg0 line0 1
 agg_set_offset    agg0 line1 3
 agg_set_line_name agg0 line0 test0
 agg_set_line_name agg0 line1 test1
 agg_enable_chip   agg0
}
teardown_2_1() {
 agg_configfs_cleanup
}

echo "2.1.1. While offline"

echo "2.1.1.1. Line can be added/removed"
setup_2_1
agg_disable_chip  agg0
agg_create_line   agg0 line2
agg_set_key       agg0 line2 "$(sim_get_chip_label chip0 bank1)"
agg_set_offset    agg0 line2 5
agg_enable_chip   agg0
test "$(agg_get_chip_num_lines agg0)" = "3" || fail "number of lines is not 1"
teardown_2_1

echo "2.1.1.2. Line key can be modified"
setup_2_1
agg_disable_chip  agg0
agg_set_key       agg0 line0 "$(sim_get_chip_label chip0 bank1)"
agg_set_key       agg0 line1 "$(sim_get_chip_label chip1 bank1)"
agg_enable_chip   agg0
teardown_2_1

echo "2.1.1.3. Line name can be modified"
setup_2_1
agg_disable_chip  agg0
agg_set_line_name agg0 line0 new0
agg_set_line_name agg0 line1 new1
agg_enable_chip   agg0
test "$(agg_get_line_name agg0 0)" = "new0" || fail "line name is unset"
test "$(agg_get_line_name agg0 1)" = "new1" || fail "line name is unset"
teardown_2_1

echo "2.1.1.4. Line offset can be modified"
setup_2_1
agg_disable_chip  agg0
agg_set_offset    agg0 line0 5
agg_set_offset    agg0 line1 7
agg_enable_chip   agg0
teardown_2_1

echo "2.1.1.5. Can re-enable a chip after valid reconfiguration"
setup_2_1
agg_disable_chip  agg0
agg_set_key       agg0 line0 "$(sim_get_chip_label chip1 bank1)"
agg_set_offset    agg0 line0 15
agg_set_key       agg0 line1 "$(sim_get_chip_label chip0 bank1)"
agg_set_offset    agg0 line0 14
agg_create_line   agg0 line2
agg_set_key       agg0 line2 "$(sim_get_chip_label chip0 bank1)"
agg_set_offset    agg0 line2 13
agg_enable_chip   agg0
test "$(agg_get_chip_num_lines agg0)" = "3" || fail "number of lines is not 1"
teardown_2_1

echo "2.1.1.7. Can't re-enable a chip with invalid reconfiguration"
setup_2_1
agg_disable_chip  agg0
agg_set_key       agg0 line0 invalidkey
echo 1 > "$CONFIGFS_AGG_DIR/agg0/live" 2> /dev/null && fail "chip unexpectedly enabled"
teardown_2_1
setup_2_1
agg_disable_chip  agg0
agg_set_offset    agg0 line0 99
echo 1 > "$CONFIGFS_AGG_DIR/agg0/live" 2> /dev/null && fail "chip unexpectedly enabled"
teardown_2_1

echo "2.1.2. While online"

echo "2.1.2.1. Can't add/remove line"
setup_2_1
mkdir "$CONFIGFS_AGG_DIR/agg0/line2" 2> /dev/null && fail "line unexpectedly added"
rmdir "$CONFIGFS_AGG_DIR/agg0/line1" 2> /dev/null && fail "line unexpectedly removed"
teardown_2_1

echo "2.1.2.2. Can't modify line key"
setup_2_1
echo "chip1_bank1" > "$CONFIGFS_AGG_DIR/agg0/line0/key" 2> /dev/null && \
 fail "lookup key unexpectedly updated"
teardown_2_1

echo "2.1.2.3. Can't modify line name"
setup_2_1
echo "new0" > "$CONFIGFS_AGG_DIR/agg0/line0/name" 2> /dev/null && \
 fail "name unexpectedly updated"
teardown_2_1

echo "2.1.2.4. Can't modify line offset"
setup_2_1
echo "5" > "$CONFIGFS_AGG_DIR/agg0/line0/offset" 2> /dev/null && \
 fail "offset unexpectedly updated"
teardown_2_1

echo "2.2. Configuring aggregators instantiated via sysfs"
setup_2_2() {
 echo "chip0_bank0 1 chip1_bank0 3" > "$SYSFS_AGG_DIR/new_device"
}
teardown_2_2() {
 echo "$(agg_configfs_dev_name _sysfs.0)" > "$SYSFS_AGG_DIR/delete_device"
}

echo "2.2.1. While online"

echo "2.2.1.1. Can toggle live"
setup_2_2
agg_disable_chip  _sysfs.0
agg_enable_chip   _sysfs.0
teardown_2_2

echo "2.2.1.2. Can't add/remove line"
setup_2_2
mkdir "$CONFIGFS_AGG_DIR/_sysfs.0/line2" 2> /dev/null && fail "line unexpectedly added"
rmdir "$CONFIGFS_AGG_DIR/_sysfs.0/line1" 2> /dev/null && fail "line unexpectedly removed"
teardown_2_2

echo "2.2.1.3. Can't modify line key"
setup_2_2
echo "chip1_bank1" > "$CONFIGFS_AGG_DIR/_sysfs.0/line0/key" 2> /dev/null && \
 fail "lookup key unexpectedly updated"
teardown_2_2

echo "2.2.1.4. Can't modify line name"
setup_2_2
echo "new0" > "$CONFIGFS_AGG_DIR/_sysfs.0/line0/name" 2> /dev/null && \
 fail "name unexpectedly updated"
teardown_2_2

echo "2.2.1.5. Can't modify line offset"
setup_2_2
echo "5" > "$CONFIGFS_AGG_DIR/_sysfs.0/line0/offset" 2> /dev/null && \
 fail "offset unexpectedly updated"
teardown_2_2

echo "2.2.2. While waiting for deferred probe"

echo "2.2.2.1. Can't add/remove line despite live = 0"
sim_disable_chip chip0
setup_2_2
mkdir "$CONFIGFS_AGG_DIR/_sysfs.0/line2" 2> /dev/null && fail "line unexpectedly added"
rmdir "$CONFIGFS_AGG_DIR/_sysfs.0/line1" 2> /dev/null && fail "line unexpectedly removed"
teardown_2_2
sim_enable_chip chip0

echo "2.2.2.2. Can't modify line key"
sim_disable_chip chip0
setup_2_2
echo "chip1_bank1" > "$CONFIGFS_AGG_DIR/_sysfs.0/line0/key" 2> /dev/null && \
 fail "lookup key unexpectedly updated"
teardown_2_2
sim_enable_chip chip0

echo "2.2.2.3. Can't modify line name"
sim_disable_chip chip0
setup_2_2
echo "new0" > "$CONFIGFS_AGG_DIR/_sysfs.0/line0/name" 2> /dev/null && \
 fail "name unexpectedly updated"
teardown_2_2
sim_enable_chip chip0

echo "2.2.2.4. Can't modify line offset"
sim_disable_chip chip0
setup_2_2
echo 5 > "$CONFIGFS_AGG_DIR/_sysfs.0/line0/offset" 2> /dev/null && \
 fail "offset unexpectedly updated"
teardown_2_2
sim_enable_chip chip0

echo "2.2.2.5. Can't toggle live"
sim_disable_chip chip0
setup_2_2
test "$(cat "$CONFIGFS_AGG_DIR/_sysfs.0/live")" = 0 || fail "chip unexpectedly alive"
echo 1 > "$CONFIGFS_AGG_DIR/_sysfs.0/live" 2> /dev/null && fail "chip unexpectedly enabled"
teardown_2_2
sim_enable_chip chip0

echo "2.2.3. While offline"

echo "2.2.3.1. Can't add/remove line despite live = 0"
setup_2_2
agg_disable_chip _sysfs.0
mkdir "$CONFIGFS_AGG_DIR/_sysfs.0/line2" 2> /dev/null && fail "line unexpectedly added"
rmdir "$CONFIGFS_AGG_DIR/_sysfs.0/line1" 2> /dev/null && fail "line unexpectedly removed"
teardown_2_2

echo "2.2.3.2. Line key can be modified"
setup_2_2
agg_disable_chip  _sysfs.0
agg_set_key       _sysfs.0 line0 "$(sim_get_chip_label chip0 bank1)"
agg_set_key       _sysfs.0 line1 "$(sim_get_chip_label chip1 bank1)"
agg_enable_chip   _sysfs.0
teardown_2_2

echo "2.2.3.3. Line name can be modified"
setup_2_2
agg_disable_chip  _sysfs.0
agg_set_line_name _sysfs.0 line0 new0
agg_set_line_name _sysfs.0 line1 new1
agg_enable_chip   _sysfs.0
test "$(agg_get_line_name _sysfs.0 0)" = "new0" || fail "line name is unset"
test "$(agg_get_line_name _sysfs.0 1)" = "new1" || fail "line name is unset"
teardown_2_2

echo "2.2.3.4. Line offset can be modified"
setup_2_2
agg_disable_chip  _sysfs.0
agg_set_offset    _sysfs.0 line0 5
agg_set_offset    _sysfs.0 line1 7
agg_enable_chip   _sysfs.0
teardown_2_2

echo "2.2.3.5. Can re-enable a chip with valid reconfiguration"
setup_2_2
agg_disable_chip  _sysfs.0
agg_set_key       _sysfs.0 line0 "$(sim_get_chip_label chip1 bank1)"
agg_set_offset    _sysfs.0 line0 15
agg_set_key       _sysfs.0 line1 "$(sim_get_chip_label chip0 bank1)"
agg_set_offset    _sysfs.0 line0 14
agg_enable_chip   _sysfs.0
teardown_2_2

echo "2.2.3.6. Can't re-enable a chip with invalid reconfiguration"
setup_2_2
agg_disable_chip  _sysfs.0
agg_set_key       _sysfs.0 line0 invalidkey
echo 1 > "$CONFIGFS_AGG_DIR/_sysfs.0/live" 2> /dev/null && fail "chip unexpectedly enabled"
teardown_2_2
setup_2_2
agg_disable_chip  _sysfs.0
agg_set_offset    _sysfs.0 line0 99
echo 1 > "$CONFIGFS_AGG_DIR/_sysfs.0/live" 2> /dev/null && fail "chip unexpectedly enabled"
teardown_2_2

echo "3. Module unload"

echo "3.1. Can't unload module if there is at least one device created via configfs"
agg_create_chip agg0
modprobe -r gpio-aggregator 2> /dev/null
test -d /sys/module/gpio_aggregator || fail "module unexpectedly unloaded"
agg_remove_chip agg0

echo "3.2. Can unload module if there is no device created via configfs"
echo "chip0_bank0 1 chip1_bank0 3" > "$SYSFS_AGG_DIR/new_device"
modprobe -r gpio-aggregator 2> /dev/null
test -d /sys/module/gpio_aggregator && fail "module unexpectedly remains to be loaded"
modprobe gpio-aggregator 2> /dev/null

echo "4. GPIO forwarder functional"
SETTINGS="chip0:bank0:2 chip0:bank1:4 chip1:bank0:6 chip1:bank1:8"
setup_4() {
 local OFFSET=0
 agg_create_chip agg0
 for SETTING in $SETTINGS; do
  CHIP=$(echo "$SETTING" | cut -d: -f1)
  BANK=$(echo "$SETTING" | cut -d: -f2)
  LINE=$(echo "$SETTING" | cut -d: -f3)
  agg_create_line agg0 "line${OFFSET}"
  agg_set_key     agg0 "line${OFFSET}" "$(sim_get_chip_label "$CHIP" "$BANK")"
  agg_set_offset  agg0 "line${OFFSET}" "$LINE"
  OFFSET=$(expr $OFFSET + 1)
 done
 agg_enable_chip agg0
}
teardown_4() {
 agg_configfs_cleanup
}

echo "4.1. Forwarding set values"
setup_4
OFFSET=0
for SETTING in $SETTINGS; do
 CHIP=$(echo "$SETTING" | cut -d: -f1)
 BANK=$(echo "$SETTING" | cut -d: -f2)
 LINE=$(echo "$SETTING" | cut -d: -f3)
 DEVNAME=$(cat "$CONFIGFS_SIM_DIR/$CHIP/dev_name")
 CHIPNAME=$(cat "$CONFIGFS_SIM_DIR/$CHIP/$BANK/chip_name")
 VAL_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio${LINE}/value"
 test $(cat $VAL_PATH) = "0" || fail "incorrect value read from sysfs"
 $BASE_DIR/gpio-mockup-cdev -s 1 "/dev/$(agg_configfs_chip_name agg0)" "$OFFSET" &
 mock_pid=$!
 sleep 0.1 # FIXME Any better way?
 test "$(cat $VAL_PATH)" = "1" || fail "incorrect value read from sysfs"
 kill "$mock_pid"
 OFFSET=$(expr $OFFSET + 1)
done
teardown_4

echo "4.2. Forwarding set config"
setup_4
OFFSET=0
for SETTING in $SETTINGS; do
 CHIP=$(echo "$SETTING" | cut -d: -f1)
 BANK=$(echo "$SETTING" | cut -d: -f2)
 LINE=$(echo "$SETTING" | cut -d: -f3)
 DEVNAME=$(cat "$CONFIGFS_SIM_DIR/$CHIP/dev_name")
 CHIPNAME=$(cat "$CONFIGFS_SIM_DIR/$CHIP/$BANK/chip_name")
 VAL_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio${LINE}/value"
 $BASE_DIR/gpio-mockup-cdev -b pull-up "/dev/$(agg_configfs_chip_name agg0)" "$OFFSET"
 test $(cat "$VAL_PATH") = "1" || fail "incorrect value read from sysfs"
 OFFSET=$(expr $OFFSET + 1)
done
teardown_4

echo "5. Race condition verification"

echo "5.1. Stress test of new_device/delete_device and module load/unload"
for _ in $(seq 1000); do
 {
  echo "dummy 0" > "$SYSFS_AGG_DIR/new_device"
  cat "$CONFIGFS_AGG_DIR/_sysfs.0/dev_name" > "$SYSFS_AGG_DIR/delete_device"
 } 2> /dev/null
done &
writer_pid=$!
while kill -0 "$writer_pid" 2> /dev/null; do
 {
  modprobe gpio-aggregator
  modprobe -r gpio-aggregator
 } 2> /dev/null
done

echo "GPIO $MODULE test PASS"