400 lines
11 KiB
Bash
Executable File
400 lines
11 KiB
Bash
Executable File
#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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# Copyright (C) 2021 Bartosz Golaszewski <brgl@bgdev.pl>
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BASE_DIR=`dirname $0`
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CONFIGFS_DIR="/sys/kernel/config/gpio-sim"
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MODULE="gpio-sim"
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fail() {
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echo "$*" >&2
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echo "GPIO $MODULE test FAIL"
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exit 1
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}
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skip() {
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echo "$*" >&2
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echo "GPIO $MODULE test SKIP"
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exit 4
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}
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remove_chip() {
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local CHIP=$1
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for FILE in $CONFIGFS_DIR/$CHIP/*; do
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BANK=`basename $FILE`
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if [ "$BANK" = "live" -o "$BANK" = "dev_name" ]; then
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continue
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fi
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LINES=`ls $CONFIGFS_DIR/$CHIP/$BANK/ | grep -E ^line`
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if [ "$?" = 0 ]; then
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for LINE in $LINES; do
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if [ -e $CONFIGFS_DIR/$CHIP/$BANK/$LINE/hog ]; then
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rmdir $CONFIGFS_DIR/$CHIP/$BANK/$LINE/hog || \
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fail "Unable to remove the hog"
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fi
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rmdir $CONFIGFS_DIR/$CHIP/$BANK/$LINE || \
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fail "Unable to remove the line"
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done
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fi
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rmdir $CONFIGFS_DIR/$CHIP/$BANK
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done
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rmdir $CONFIGFS_DIR/$CHIP || fail "Unable to remove the chip"
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}
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configfs_cleanup() {
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for CHIP in `ls $CONFIGFS_DIR/`; do
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remove_chip $CHIP
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done
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}
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create_chip() {
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local CHIP=$1
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mkdir $CONFIGFS_DIR/$CHIP
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}
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create_bank() {
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local CHIP=$1
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local BANK=$2
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mkdir $CONFIGFS_DIR/$CHIP/$BANK
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}
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set_label() {
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local CHIP=$1
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local BANK=$2
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local LABEL=$3
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echo $LABEL > $CONFIGFS_DIR/$CHIP/$BANK/label || fail "Unable to set the chip label"
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}
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set_num_lines() {
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local CHIP=$1
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local BANK=$2
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local NUM_LINES=$3
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echo $NUM_LINES > $CONFIGFS_DIR/$CHIP/$BANK/num_lines || \
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fail "Unable to set the number of lines"
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}
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set_line_name() {
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local CHIP=$1
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local BANK=$2
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local OFFSET=$3
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local NAME=$4
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local LINE_DIR=$CONFIGFS_DIR/$CHIP/$BANK/line$OFFSET
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test -d $LINE_DIR || mkdir $LINE_DIR
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echo $NAME > $LINE_DIR/name || fail "Unable to set the line name"
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}
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enable_chip() {
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local CHIP=$1
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echo 1 > $CONFIGFS_DIR/$CHIP/live || fail "Unable to enable the chip"
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}
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disable_chip() {
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local CHIP=$1
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echo 0 > $CONFIGFS_DIR/$CHIP/live || fail "Unable to disable the chip"
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}
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configfs_chip_name() {
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local CHIP=$1
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local BANK=$2
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cat $CONFIGFS_DIR/$CHIP/$BANK/chip_name 2> /dev/null || \
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fail "unable to read the chip name from configfs"
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}
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configfs_dev_name() {
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local CHIP=$1
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cat $CONFIGFS_DIR/$CHIP/dev_name 2> /dev/null || \
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fail "unable to read the device name from configfs"
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}
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get_chip_num_lines() {
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local CHIP=$1
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local BANK=$2
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$BASE_DIR/gpio-chip-info /dev/`configfs_chip_name $CHIP $BANK` num-lines || \
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fail "unable to read the number of lines from the character device"
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}
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get_chip_label() {
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local CHIP=$1
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local BANK=$2
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$BASE_DIR/gpio-chip-info /dev/`configfs_chip_name $CHIP $BANK` label || \
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fail "unable to read the chip label from the character device"
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}
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get_line_name() {
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local CHIP=$1
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local BANK=$2
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local OFFSET=$3
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$BASE_DIR/gpio-line-name /dev/`configfs_chip_name $CHIP $BANK` $OFFSET || \
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fail "unable to read the line name from the character device"
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}
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sysfs_set_pull() {
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local DEV=$1
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local BANK=$2
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local OFFSET=$3
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local PULL=$4
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local DEVNAME=`configfs_dev_name $DEV`
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local CHIPNAME=`configfs_chip_name $DEV $BANK`
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local SYSFS_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio$OFFSET/pull"
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echo $PULL > $SYSFS_PATH || fail "Unable to set line pull in sysfs"
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}
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# Load the gpio-sim module. This will pull in configfs if needed too.
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modprobe gpio-sim || skip "unable to load the gpio-sim module"
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# Make sure configfs is mounted at /sys/kernel/config. Wait a bit if needed.
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for IDX in `seq 5`; do
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if [ "$IDX" -eq "5" ]; then
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skip "configfs not mounted at /sys/kernel/config"
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fi
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mountpoint -q /sys/kernel/config && break
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sleep 0.1
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done
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# If the module was already loaded: remove all previous chips
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configfs_cleanup
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trap "exit 1" SIGTERM SIGINT
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trap configfs_cleanup EXIT
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echo "1. chip_name and dev_name attributes"
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echo "1.1. Chip name is communicated to user"
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create_chip chip
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create_bank chip bank
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enable_chip chip
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test -n `cat $CONFIGFS_DIR/chip/bank/chip_name` || fail "chip_name doesn't work"
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remove_chip chip
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echo "1.2. chip_name returns 'none' if the chip is still pending"
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create_chip chip
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create_bank chip bank
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test "`cat $CONFIGFS_DIR/chip/bank/chip_name`" = "none" || \
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fail "chip_name doesn't return 'none' for a pending chip"
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remove_chip chip
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echo "1.3. Device name is communicated to user"
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create_chip chip
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create_bank chip bank
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enable_chip chip
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test -n `cat $CONFIGFS_DIR/chip/dev_name` || fail "dev_name doesn't work"
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remove_chip chip
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echo "2. Creating and configuring simulated chips"
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echo "2.1. Default number of lines is 1"
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create_chip chip
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create_bank chip bank
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enable_chip chip
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test "`get_chip_num_lines chip bank`" = "1" || fail "default number of lines is not 1"
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remove_chip chip
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echo "2.2. Number of lines can be specified"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 16
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enable_chip chip
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test "`get_chip_num_lines chip bank`" = "16" || fail "number of lines is not 16"
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remove_chip chip
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echo "2.3. Label can be set"
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create_chip chip
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create_bank chip bank
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set_label chip bank foobar
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enable_chip chip
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test "`get_chip_label chip bank`" = "foobar" || fail "label is incorrect"
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remove_chip chip
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echo "2.4. Label can be left empty"
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create_chip chip
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create_bank chip bank
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enable_chip chip
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test -z "`cat $CONFIGFS_DIR/chip/bank/label`" || fail "label is not empty"
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remove_chip chip
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echo "2.5. Line names can be configured"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 16
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set_line_name chip bank 0 foo
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set_line_name chip bank 2 bar
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enable_chip chip
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test "`get_line_name chip bank 0`" = "foo" || fail "line name is incorrect"
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test "`get_line_name chip bank 2`" = "bar" || fail "line name is incorrect"
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remove_chip chip
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echo "2.6. Line config can remain unused if offset is greater than number of lines"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 2
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set_line_name chip bank 5 foobar
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enable_chip chip
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test "`get_line_name chip bank 0`" = "" || fail "line name is incorrect"
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test "`get_line_name chip bank 1`" = "" || fail "line name is incorrect"
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remove_chip chip
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echo "2.7. Line configfs directory names are sanitized"
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create_chip chip
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create_bank chip bank
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mkdir $CONFIGFS_DIR/chip/bank/line12foobar 2> /dev/null && \
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fail "invalid configfs line name accepted"
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mkdir $CONFIGFS_DIR/chip/bank/line_no_offset 2> /dev/null && \
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fail "invalid configfs line name accepted"
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remove_chip chip
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echo "2.8. Multiple chips can be created"
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CHIPS="chip0 chip1 chip2"
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for CHIP in $CHIPS; do
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create_chip $CHIP
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create_bank $CHIP bank
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enable_chip $CHIP
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done
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for CHIP in $CHIPS; do
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remove_chip $CHIP
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done
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echo "2.9. Can't modify settings when chip is live"
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create_chip chip
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create_bank chip bank
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enable_chip chip
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echo foobar > $CONFIGFS_DIR/chip/bank/label 2> /dev/null && \
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fail "Setting label of a live chip should fail"
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echo 8 > $CONFIGFS_DIR/chip/bank/num_lines 2> /dev/null && \
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fail "Setting number of lines of a live chip should fail"
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remove_chip chip
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echo "2.10. Can't create line items when chip is live"
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create_chip chip
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create_bank chip bank
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enable_chip chip
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mkdir $CONFIGFS_DIR/chip/bank/line0 2> /dev/null && fail "Creating line item should fail"
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remove_chip chip
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echo "2.11. Probe errors are propagated to user-space"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 99999
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echo 1 > $CONFIGFS_DIR/chip/live 2> /dev/null && fail "Probe error was not propagated"
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remove_chip chip
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echo "2.12. Cannot enable a chip without any GPIO banks"
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create_chip chip
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echo 1 > $CONFIGFS_DIR/chip/live 2> /dev/null && fail "Chip enabled without any GPIO banks"
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remove_chip chip
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echo "2.13. Duplicate chip labels are not allowed"
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create_chip chip
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create_bank chip bank0
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set_label chip bank0 foobar
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create_bank chip bank1
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set_label chip bank1 foobar
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echo 1 > $CONFIGFS_DIR/chip/live 2> /dev/null && fail "Duplicate chip labels were not rejected"
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remove_chip chip
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echo "2.14. Lines can be hogged"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 8
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mkdir -p $CONFIGFS_DIR/chip/bank/line4/hog
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enable_chip chip
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$BASE_DIR/gpio-mockup-cdev -s 1 /dev/`configfs_chip_name chip bank` 4 2> /dev/null && \
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fail "Setting the value of a hogged line shouldn't succeed"
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remove_chip chip
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echo "3. Controlling simulated chips"
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echo "3.1. Pull can be set over sysfs"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 8
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enable_chip chip
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sysfs_set_pull chip bank 0 pull-up
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$BASE_DIR/gpio-mockup-cdev /dev/`configfs_chip_name chip bank` 0
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test "$?" = "1" || fail "pull set incorrectly"
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sysfs_set_pull chip bank 0 pull-down
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$BASE_DIR/gpio-mockup-cdev /dev/`configfs_chip_name chip bank` 1
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test "$?" = "0" || fail "pull set incorrectly"
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remove_chip chip
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echo "3.2. Pull can be read from sysfs"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 8
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enable_chip chip
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DEVNAME=`configfs_dev_name chip`
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CHIPNAME=`configfs_chip_name chip bank`
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SYSFS_PATH=/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/pull
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test `cat $SYSFS_PATH` = "pull-down" || fail "reading the pull failed"
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sysfs_set_pull chip bank 0 pull-up
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test `cat $SYSFS_PATH` = "pull-up" || fail "reading the pull failed"
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remove_chip chip
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echo "3.3. Incorrect input in sysfs is rejected"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 8
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enable_chip chip
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DEVNAME=`configfs_dev_name chip`
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CHIPNAME=`configfs_chip_name chip bank`
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SYSFS_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/pull"
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echo foobar > $SYSFS_PATH 2> /dev/null && fail "invalid input not detected"
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remove_chip chip
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echo "3.4. Can't write to value"
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create_chip chip
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create_bank chip bank
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enable_chip chip
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DEVNAME=`configfs_dev_name chip`
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CHIPNAME=`configfs_chip_name chip bank`
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SYSFS_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/value"
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echo 1 > $SYSFS_PATH 2> /dev/null && fail "writing to 'value' succeeded unexpectedly"
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remove_chip chip
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echo "4. Simulated GPIO chips are functional"
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echo "4.1. Values can be read from sysfs"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 8
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enable_chip chip
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DEVNAME=`configfs_dev_name chip`
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CHIPNAME=`configfs_chip_name chip bank`
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SYSFS_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/value"
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test `cat $SYSFS_PATH` = "0" || fail "incorrect value read from sysfs"
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$BASE_DIR/gpio-mockup-cdev -s 1 /dev/`configfs_chip_name chip bank` 0 &
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sleep 0.1 # FIXME Any better way?
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test `cat $SYSFS_PATH` = "1" || fail "incorrect value read from sysfs"
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kill $!
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remove_chip chip
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echo "4.2. Bias settings work correctly"
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create_chip chip
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create_bank chip bank
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set_num_lines chip bank 8
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enable_chip chip
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DEVNAME=`configfs_dev_name chip`
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CHIPNAME=`configfs_chip_name chip bank`
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SYSFS_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/value"
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$BASE_DIR/gpio-mockup-cdev -b pull-up /dev/`configfs_chip_name chip bank` 0
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test `cat $SYSFS_PATH` = "1" || fail "bias setting does not work"
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remove_chip chip
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echo "GPIO $MODULE test PASS"
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