This test script try to do whitebox testing for gpio subsystem(
based on gpiolib). It manipulate gpio-mockup device through sysfs
provided and check the result from debugfs.
Test the following things:
1. Add single, multi gpiochip with the checking of overlap.
2. Test direction and output value for valid pin.
3. Test dynamic allocation of gpio base.
Signed-off-by: Bamvor Jian Zhang <bamvor.zhangj...@linaro.org>
---
tools/testing/selftests/Makefile | 1 +
tools/testing/selftests/gpio/gpio.sh | 238 +++++++++++++++++++++++++++++++++++
2 files changed, 239 insertions(+)
create mode 100755 tools/testing/selftests/gpio/gpio.sh
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index cfe1213..df0b81d 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -5,6 +5,7 @@ TARGETS += exec
TARGETS += firmware
TARGETS += ftrace
TARGETS += futex
+TARGETS += gpio
TARGETS += kcmp
TARGETS += membarrier
TARGETS += memfd
diff --git a/tools/testing/selftests/gpio/gpio.sh
b/tools/testing/selftests/gpio/gpio.sh
new file mode 100755
index 0000000..05e109e
--- /dev/null
+++ b/tools/testing/selftests/gpio/gpio.sh
@@ -0,0 +1,238 @@
+#!/bin/bash
+
+module="gpio-mockup"
+
+SYSFS=
+GPIO_SYSFS=
+GPIO_DRV_SYSFS=
+DEBUGFS=
+GPIO_DEBUGFS=
+
+prerequisite()
+{
+ msg="skip all tests:"
+
+ if [ $UID != 0 ]; then
+ echo $msg must be run as root >&2
+ exit 0
+ fi
+
+ SYSFS=`mount -t sysfs | head -1 | awk '{ print $3 }'`
+ if [ ! -d "$SYSFS" ]; then
+ echo $msg sysfs is not mounted >&2
+ exit 0
+ fi
+ GPIO_SYSFS=`echo $SYSFS/class/gpio`
+ GPIO_DRV_SYSFS=`echo $SYSFS/devices/platform/$module/gpio`
+
+ DEBUGFS=`mount -t debugfs | head -1 | awk '{ print $3 }'`
+ if [ ! -d "$DEBUGFS" ]; then
+ echo $msg debugfs is not mounted >&2
+ exit 0
+ fi
+ GPIO_DEBUGFS=`echo $DEBUGFS/gpio`
+
+}
+
+insert_module()
+{
+ if modprobe -q $module $1; then
+ echo -n ""
+ else
+ echo $msg insmod $module failed >&2
+ exit 0
+ fi
+}
+
+remove_module()
+{
+ modprobe -r -q $module
+}
+
+die()
+{
+ remove_module
+ exit 1
+}
+
+gpio_test()
+{
+ param=$1
+ if [ X$2 != X ]; then
+ invalid_pin=$2
+ fi
+ if [ X$param = X ]; then
+ insert_module
+ else
+ insert_module "conf=$param"
+ fi
+
+ echo -n "GPIO $module test with base,ngpio configure<"
+ if [ X$param = X ]; then
+ echo "(default)>: ";
+ else
+ echo "$param>: "
+ fi
+ printf "%-10s %-5s %-5s\n" name base ngpio
+ gpiochip=`ls -d $GPIO_DRV_SYSFS/gpiochip* 2>/dev/null`
+ if [ X"$gpiochip" = X ]; then
+ echo "no gpiochip"
+ else
+ for chip in $gpiochip; do
+ name=`basename $chip`
+ base=`cat $chip/base`
+ ngpio=`cat $chip/ngpio`
+ printf "%-10s %-5s %-5s\n" $name $base $ngpio
+ if [ $ngpio = "0" ]; then
+ echo "number of gpio is zero is not allowed".
+ fi
+ test_one_pin $base
+ test_one_pin $(($base + $ngpio - 1))
+ test_one_pin $((( RANDOM % $ngpio ) + $base ))
+ if [ X$invalid_pin != X ]; then
+ test_one_pin_fail $invalid_pin
+ fi
+ done
+ fi
+ remove_module
+}
+
+gpio_test_fail()
+{
+ param=$1
+
+ insert_module "conf=$param"
+ echo -n "GPIO $module fail test with base,ngpio configure<$param>: "
+ gpiochip=`ls -d $GPIO_DRV_SYSFS/gpiochip* 2>/dev/null`
+ if [ X"$gpiochip" = X ]; then
+ echo "successful"
+ else
+ echo "fail"
+ die
+ fi
+ remove_module
+}
+
+is_consistent()
+{
+ val=
+
+ active_low_sysfs=`cat $GPIO_SYSFS/gpio$nr/active_low`
+ val_sysfs=`cat $GPIO_SYSFS/gpio$nr/value`
+ dir_sysfs=`cat $GPIO_SYSFS/gpio$nr/direction`
+
+ gpio_this_debugfs=`cat $GPIO_DEBUGFS |grep "gpio-$nr" | sed "s/(.*)//g"`
+ dir_debugfs=`echo $gpio_this_debugfs | awk '{print $2}'`
+ val_debugfs=`echo $gpio_this_debugfs | awk '{print $3}'`
+ if [ $val_debugfs = "lo" ]; then
+ val=0
+ elif [ $val_debugfs = "hi" ]; then
+ val=1
+ fi
+
+ if [ $active_low_sysfs = "1" ]; then
+ if [ $val = "0" ]; then
+ val="1"
+ else
+ val="0"
+ fi
+ fi
+
+ if [ $val_sysfs = $val ] && [ $dir_sysfs = $dir_debugfs ]; then
+ echo -n "."
+ else
+ echo "test fail, exit"
+ die
+ fi
+}
+
+test_pin_logic()
+{
+ nr=$1
+ direction=$2
+ active_low=$3
+ value=$4
+
+ echo $direction > $GPIO_SYSFS/gpio$nr/direction
+ echo $active_low > $GPIO_SYSFS/gpio$nr/active_low
+ if [ $direction = "out" ]; then
+ echo $value > $GPIO_SYSFS/gpio$nr/value
+ fi
+ is_consistent $nr
+}
+
+test_one_pin()
+{
+ nr=$1
+
+ echo -n "test pin<$nr>"
+
+ echo $nr > $GPIO_SYSFS/export 2>/dev/null
+
+ if [ X$? != X0 ]; then
+ echo "test GPIO pin $nr failed"
+ die
+ fi
+
+ #"Checking if the sysfs is consistent with debugfs: "
+ is_consistent $nr
+
+ #"Checking the logic of active_low: "
+ test_pin_logic $nr out 1 1
+ test_pin_logic $nr out 1 0
+ test_pin_logic $nr out 0 1
+ test_pin_logic $nr out 0 0
+
+ #"Checking the logic of direction: "
+ test_pin_logic $nr in 1 1
+ test_pin_logic $nr out 1 0
+ test_pin_logic $nr low 0 1
+ test_pin_logic $nr high 0 0
+
+ echo $nr > $GPIO_SYSFS/unexport
+
+ echo "successful"
+}
+
+test_one_pin_fail()
+{
+ nr=$1
+
+ echo $nr > $GPIO_SYSFS/export 2>/dev/null
+
+ if [ X$? != X0 ]; then
+ echo "test invalid pin $nr successful"
+ else
+ echo "test invalid pin $nr failed"
+ echo $nr > $GPIO_SYSFS/unexport 2>/dev/null
+ die
+ fi
+}
+
+prerequisite
+
+#basically
+gpio_test
+gpio_test "0,32" 33
+gpio_test "0,32,32,16" 50
+gpio_test "0,32,40,16,32,5" 38
+#test dynamic allocation of gpio
+gpio_test "-1,32"
+gpio_test "-1,32,32,16" 31
+gpio_test "-1,32,40,16,-1,5" 38
+#error test
+#zero number of gpio
+gpio_test_fail "0,0"
+#base conflict
+gpio_test_fail "0,32,0,1"
+#range overlap
+gpio_test_fail "0,32,30,5"
+gpio_test_fail "0,32,1,5"
+gpio_test_fail "10,32,9,5"
+gpio_test_fail "10,32,30,5"
+gpio_test_fail "0,32,40,16,39,5"
+gpio_test_fail "0,32,40,16,30,5"
+gpio_test_fail "0,32,40,16,30,11"
+gpio_test_fail "0,32,40,16,20,1"
+
+echo GPIO test PASS
--
2.1.4
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