Add a set of tests for the new gpio-sim module. This is a pure shell test-suite and uses the helper programs available in the gpio selftests directory. These test-cases only test the functionalities exposed by the gpio-sim driver, not those handled by core gpiolib code.
Signed-off-by: Bartosz Golaszewski brgl@bgdev.pl --- tools/testing/selftests/gpio/Makefile | 2 +- tools/testing/selftests/gpio/config | 1 + tools/testing/selftests/gpio/gpio-sim.sh | 266 +++++++++++++++++++++++ 3 files changed, 268 insertions(+), 1 deletion(-) create mode 100755 tools/testing/selftests/gpio/gpio-sim.sh
diff --git a/tools/testing/selftests/gpio/Makefile b/tools/testing/selftests/gpio/Makefile index d7d8f1985d99..4c6df61c76a8 100644 --- a/tools/testing/selftests/gpio/Makefile +++ b/tools/testing/selftests/gpio/Makefile @@ -1,6 +1,6 @@ # SPDX-License-Identifier: GPL-2.0
-TEST_PROGS := gpio-mockup.sh +TEST_PROGS := gpio-mockup.sh gpio-sim.sh TEST_FILES := gpio-mockup-sysfs.sh TEST_GEN_PROGS_EXTENDED := gpio-mockup-cdev gpio-chip-info gpio-line-name
diff --git a/tools/testing/selftests/gpio/config b/tools/testing/selftests/gpio/config index ce100342c20b..409a8532facc 100644 --- a/tools/testing/selftests/gpio/config +++ b/tools/testing/selftests/gpio/config @@ -1,3 +1,4 @@ CONFIG_GPIOLIB=y CONFIG_GPIO_CDEV=y CONFIG_GPIO_MOCKUP=m +CONFIG_GPIO_SIM=m diff --git a/tools/testing/selftests/gpio/gpio-sim.sh b/tools/testing/selftests/gpio/gpio-sim.sh new file mode 100755 index 000000000000..99ce808d772a --- /dev/null +++ b/tools/testing/selftests/gpio/gpio-sim.sh @@ -0,0 +1,266 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2021 Bartosz Golaszewski brgl@bgdev.pl + +BASE_DIR=`dirname $0` +CONFIGFS_DIR="/sys/kernel/config/gpio-sim" +MODULE="gpio-sim" + +fail() { + echo "$*" >&2 + echo "GPIO $MODULE test FAIL" + exit 1 +} + +skip() { + echo "$*" >&2 + echo "GPIO $MODULE test SKIP" + exit 4 +} + +remove_chip() { + local CHIP=$1 + + LINES=`ls $CONFIGFS_DIR/$CHIP/ | egrep ^line` + if [ "$?" == 0 ]; then + for LINE in $LINES; do + rmdir $CONFIGFS_DIR/$CHIP/$LINE || fail "Unable to remove the line" + done + fi + + rmdir $CONFIGFS_DIR/$CHIP || fail "Unable to remove the chip" +} + +configfs_cleanup() { + for CHIP in `ls $CONFIGFS_DIR/`; do + remove_chip $CHIP + done +} + +create_chip() { + local CHIP=$1 + local CHIP_DIR="$CONFIGFS_DIR/$CHIP" + + mkdir $CHIP_DIR +} + +set_label() { + local CHIP=$1 + local LABEL=$2 + + echo $LABEL > $CONFIGFS_DIR/$CHIP/label || fail "Unable to set the chip label" +} + +set_num_lines() { + local CHIP=$1 + local NUM_LINES=$2 + + echo $NUM_LINES > $CONFIGFS_DIR/$CHIP/num_lines || fail "Unable to set the number of lines" +} + +set_line_name() { + local CHIP=$1 + local OFFSET=$2 + local NAME=$3 + local LINE_DIR=$CONFIGFS_DIR/$CHIP/line$OFFSET + + test -d $LINE_DIR || mkdir $LINE_DIR + echo $NAME > $LINE_DIR/name || fail "Unable to set the line name" +} + +enable_chip() { + local CHIP=$1 + + echo 1 > $CONFIGFS_DIR/$CHIP/live || fail "Unable to enable the chip" +} + +disable_chip() { + local CHIP=$1 + + echo 0 > $CONFIGFS_DIR/$CHIP/live || fail "Unable to disable the chip" +} + +configfs_chip_name() { + local CHIP="$1" + + cat $CONFIGFS_DIR/$CHIP/chip_name 2> /dev/null || return 1 +} + +configfs_dev_name() { + local CHIP="$1" + + cat $CONFIGFS_DIR/$CHIP/dev_name 2> /dev/null || return 1 +} + +get_chip_num_lines() { + local CHIP="$1" + + $BASE_DIR/gpio-chip-info /dev/`configfs_chip_name $CHIP` num-lines +} + +get_chip_label() { + local CHIP="$1" + + $BASE_DIR/gpio-chip-info /dev/`configfs_chip_name $CHIP` label +} + +get_line_name() { + local CHIP="$1" + local OFFSET="$2" + + $BASE_DIR/gpio-line-name /dev/`configfs_chip_name $CHIP` $OFFSET +} + +sysfs_set_pull() { + local CHIP="$1" + local OFFSET="$2" + local PULL="$3" + local SYSFSPATH="/sys/devices/platform/`configfs_dev_name $CHIP`/control/gpio$OFFSET" + + echo $PULL > $SYSFSPATH || fail "Unable to set line pull in sysfs" +} + +# Load the gpio-sim module. This will pull in configfs if needed too. +modprobe gpio-sim || skip "unable to load the gpio-sim module" +# Make sure configfs is mounted at /sys/kernel/config. Wait a bit if needed. +for IDX in `seq 5`; do + if [ "$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 +configfs_cleanup + +trap "exit 1" SIGTERM SIGINT +trap configfs_cleanup EXIT + +echo "1. chip_name and dev_name attributes" + +echo "1.1. Chip name is communicated to user" +create_chip chip +enable_chip chip +test -n `cat $CONFIGFS_DIR/chip/chip_name` || fail "chip_name doesn't work" +remove_chip chip + +echo "1.2. chip_name returns 'none' if the chip is still pending" +create_chip chip +test "`cat $CONFIGFS_DIR/chip/chip_name`" = "none" || fail "chip_name doesn't return 'none' for a pending chip" +remove_chip chip + +echo "1.3. Device name is communicated to user" +create_chip chip +enable_chip chip +test -n `cat $CONFIGFS_DIR/chip/dev_name` || fail "dev_name doesn't work" +remove_chip chip + +echo "2. Creating and configuring simulated chips" + +echo "2.1. Default number of lines is 1" +create_chip chip +enable_chip chip +test "`get_chip_num_lines chip`" = "1" || fail "default number of lines is not 1" +remove_chip chip + +echo "2.2. Number of lines can be specified" +create_chip chip +set_num_lines chip 16 +enable_chip chip +test "`get_chip_num_lines chip`" = "16" || fail "number of lines is not 16" +remove_chip chip + +echo "2.3. Label can be set" +create_chip chip +set_label chip foobar +enable_chip chip +test "`get_chip_label chip`" = "foobar" || fail "label is incorrect" +remove_chip chip + +echo "2.4. Label can be left empty" +create_chip chip +enable_chip chip +test -z "`cat $CONFIGFS_DIR/chip/label`" || fail "label is not empty" +remove_chip chip + +echo "2.5. Line names can be configured" +create_chip chip +set_num_lines chip 16 +set_line_name chip 0 foo +set_line_name chip 2 bar +enable_chip chip +test "`get_line_name chip 0`" = "foo" || fail "line name is incorrect" +test "`get_line_name chip 2`" = "bar" || fail "line name is incorrect" +remove_chip chip + +echo "2.6. Line name can remain unused" +create_chip chip +set_num_lines chip 2 +set_line_name chip 5 foobar +enable_chip chip +test "`get_line_name chip 0`" = "" || fail "line name is incorrect" +test "`get_line_name chip 1`" = "" || fail "line name is incorrect" +remove_chip chip + +echo "2.7. Line configfs directory names are sanitized" +create_chip chip +mkdir $CONFIGFS_DIR/chip/line12foobar 2> /dev/null && fail "invalid configfs line name accepted" +mkdir $CONFIGFS_DIR/chip/line_no_offset 2> /dev/null && fail "invalid configfs line name accepted" +remove_chip chip + +echo "2.8. Multiple chips can be created" +CHIPS="chip0 chip1 chip2" +for CHIP in $CHIPS; do + create_chip $CHIP + enable_chip $CHIP +done +for CHIP in $CHIPS; do + remove_chip $CHIP +done + +echo "3. Controlling simulated chips" + +echo "3.3. Pull can be set over sysfs" +create_chip chip +set_num_lines chip 8 +enable_chip chip +sysfs_set_pull chip 0 1 +$BASE_DIR/gpio-mockup-cdev /dev/`configfs_chip_name chip` 0 +test "$?" = "1" || fail "pull set incorrectly" +sysfs_set_pull chip 0 0 +$BASE_DIR/gpio-mockup-cdev /dev/`configfs_chip_name chip` 1 +test "$?" = "0" || fail "pull set incorrectly" +remove_chip chip + +echo "3.4. Incorrect input in sysfs is rejected" +create_chip chip +set_num_lines chip 8 +enable_chip chip +SYSFS_PATH="/sys/devices/platform/`configfs_dev_name chip`/control/gpio0" +echo 2 > $SYSFS_PATH 2> /dev/null && fail "invalid input not detected" +remove_chip chip + +echo "4. Simulated GPIO chips are functional" + +echo "4.1. Values can be read from sysfs" +create_chip chip +set_num_lines chip 8 +enable_chip chip +SYSFS_PATH="/sys/devices/platform/`configfs_dev_name chip`/control/gpio0" +test `cat $SYSFS_PATH` = "0" || fail "incorrect value read from sysfs" +$BASE_DIR/gpio-mockup-cdev -s 1 /dev/`configfs_chip_name chip` 0 & +sleep 0.1 # FIXME Any better way? +test `cat $SYSFS_PATH` = "1" || fail "incorrect value read from sysfs" +kill $! +remove_chip chip + +echo "4.2. Bias settings work correctly" +create_chip chip +set_num_lines chip 8 +enable_chip chip +$BASE_DIR/gpio-mockup-cdev -b pull-up /dev/`configfs_chip_name chip` 0 +test `cat $SYSFS_PATH` = "1" || fail "bias setting does not work" +remove_chip chip + +echo "GPIO $MODULE test PASS"