404 lines
8.5 KiB
Bash
Executable File
404 lines
8.5 KiB
Bash
Executable File
#!/bin/bash -efu
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# SPDX-License-Identifier: GPL-2.0
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#exit status
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#0: success
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#1: fail
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#4: skip test - including run as non-root user
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BASE=${0%/*}
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DEBUGFS=
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GPIO_DEBUGFS=
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dev_type="cdev"
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module="gpio-mockup"
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verbose=
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full_test=
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random=
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uapi_opt=
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active_opt=
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bias_opt=
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line_set_pid=
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# Kselftest return codes
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ksft_fail=1
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ksft_skip=4
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usage()
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{
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echo "Usage:"
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echo "$0 [-frv] [-t type]"
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echo "-f: full test (minimal set run by default)"
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echo "-r: test random lines as well as fence posts"
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echo "-t: interface type:"
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echo " cdev (character device ABI) - default"
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echo " cdev_v1 (deprecated character device ABI)"
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echo " sysfs (deprecated SYSFS ABI)"
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echo "-v: verbose progress reporting"
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exit $ksft_fail
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}
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skip()
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{
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echo "$*" >&2
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echo "GPIO $module test SKIP"
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exit $ksft_skip
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}
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prerequisite()
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{
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[ $(id -u) -eq 0 ] || skip "must be run as root"
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DEBUGFS=$(grep -w debugfs /proc/mounts | cut -f2 -d' ')
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[ -d "$DEBUGFS" ] || skip "debugfs is not mounted"
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GPIO_DEBUGFS=$DEBUGFS/$module
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}
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remove_module()
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{
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modprobe -r -q $module
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}
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cleanup()
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{
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set +e
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release_line
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remove_module
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jobs -p | xargs -r kill > /dev/null 2>&1
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}
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fail()
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{
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echo "test failed: $*" >&2
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echo "GPIO $module test FAIL"
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exit $ksft_fail
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}
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try_insert_module()
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{
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modprobe -q $module "$1" || fail "insert $module failed with error $?"
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}
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log()
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{
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[ -z "$verbose" ] || echo "$*"
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}
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# The following line helpers, release_Line, get_line and set_line, all
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# make use of the global $chip and $offset variables.
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#
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# This implementation drives the GPIO character device (cdev) uAPI.
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# Other implementations may override these to test different uAPIs.
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# Release any resources related to the line
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release_line()
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{
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[ "$line_set_pid" ] && kill $line_set_pid && wait $line_set_pid || true
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line_set_pid=
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}
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# Read the current value of the line
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get_line()
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{
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release_line
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local cdev_opts=${uapi_opt}${active_opt}
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$BASE/gpio-mockup-cdev $cdev_opts /dev/$chip $offset
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echo $?
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}
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# Set the state of the line
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#
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# Changes to line configuration are provided as parameters.
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# The line is assumed to be an output if the line value 0 or 1 is
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# specified, else an input.
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set_line()
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{
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local val=
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release_line
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# parse config options...
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for option in $*; do
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case $option in
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active-low)
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active_opt="-l "
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;;
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active-high)
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active_opt=
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;;
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bias-none)
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bias_opt=
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;;
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pull-down)
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bias_opt="-bpull-down "
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;;
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pull-up)
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bias_opt="-bpull-up "
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;;
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0)
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val=0
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;;
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1)
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val=1
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;;
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esac
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done
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local cdev_opts=${uapi_opt}${active_opt}
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if [ "$val" ]; then
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$BASE/gpio-mockup-cdev $cdev_opts -s$val /dev/$chip $offset &
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# failure to set is detected by reading mockup and toggling values
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line_set_pid=$!
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# allow for gpio-mockup-cdev to launch and request line
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# (there is limited value in checking if line has been requested)
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sleep 0.01
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elif [ "$bias_opt" ]; then
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cdev_opts=${cdev_opts}${bias_opt}
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$BASE/gpio-mockup-cdev $cdev_opts /dev/$chip $offset || true
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fi
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}
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assert_line()
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{
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local val
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# don't need any retry here as set_mock allows for propagation
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val=$(get_line)
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[ "$val" = "$1" ] || fail "line value is ${val:-empty} when $1 was expected"
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}
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# The following mockup helpers all make use of the $mock_line
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assert_mock()
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{
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local backoff_wait=10
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local retry=0
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local val
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# retry allows for set propagation from uAPI to mockup
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while true; do
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val=$(< $mock_line)
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[ "$val" = "$1" ] && break
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retry=$((retry + 1))
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[ $retry -lt 5 ] || fail "mockup $mock_line value ${val:-empty} when $1 expected"
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sleep $(printf "%0.2f" $((backoff_wait))e-3)
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backoff_wait=$((backoff_wait * 2))
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done
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}
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set_mock()
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{
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echo "$1" > $mock_line
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# allow for set propagation - so we won't be in a race with set_line
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assert_mock "$1"
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}
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# test the functionality of a line
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#
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# The line is set from the mockup side and is read from the userspace side
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# (input), and is set from the userspace side and is read from the mockup side
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# (output).
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#
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# Setting the mockup pull using the userspace interface bias settings is
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# tested where supported by the userspace interface (cdev).
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test_line()
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{
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chip=$1
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offset=$2
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log "test_line $chip $offset"
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mock_line=$GPIO_DEBUGFS/$chip/$offset
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[ -e "$mock_line" ] || fail "missing line $chip:$offset"
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# test input active-high
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set_mock 1
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set_line input active-high
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assert_line 1
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set_mock 0
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assert_line 0
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set_mock 1
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assert_line 1
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if [ "$full_test" ]; then
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if [ "$dev_type" != "sysfs" ]; then
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# test pulls
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set_mock 0
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set_line input pull-up
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assert_line 1
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set_mock 0
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assert_line 0
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set_mock 1
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set_line input pull-down
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assert_line 0
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set_mock 1
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assert_line 1
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set_line bias-none
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fi
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# test input active-low
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set_mock 0
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set_line active-low
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assert_line 1
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set_mock 1
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assert_line 0
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set_mock 0
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assert_line 1
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# test output active-high
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set_mock 1
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set_line active-high 0
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assert_mock 0
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set_line 1
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assert_mock 1
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set_line 0
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assert_mock 0
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fi
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# test output active-low
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set_mock 0
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set_line active-low 0
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assert_mock 1
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set_line 1
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assert_mock 0
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set_line 0
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assert_mock 1
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release_line
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}
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test_no_line()
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{
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log test_no_line "$*"
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[ ! -e "$GPIO_DEBUGFS/$1/$2" ] || fail "unexpected line $1:$2"
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}
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# Load the module and check that the expected number of gpiochips, with the
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# expected number of lines, are created and are functional.
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#
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# $1 is the gpio_mockup_ranges parameter for the module
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# The remaining parameters are the number of lines, n, expected for each of
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# the gpiochips expected to be created.
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#
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# For each gpiochip the fence post lines, 0 and n-1, are tested, and the
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# line on the far side of the fence post, n, is tested to not exist.
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#
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# If the $random flag is set then a random line in the middle of the
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# gpiochip is tested as well.
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insmod_test()
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{
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local ranges=
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local gc=
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local width=
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[ "${1:-}" ] || fail "missing ranges"
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ranges=$1 ; shift
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try_insert_module "gpio_mockup_ranges=$ranges"
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log "GPIO $module test with ranges: <$ranges>:"
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# e.g. /sys/kernel/debug/gpio-mockup/gpiochip1
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gpiochip=$(find "$DEBUGFS/$module/" -name gpiochip* -type d | sort)
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for chip in $gpiochip; do
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gc=${chip##*/}
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[ "${1:-}" ] || fail "unexpected chip - $gc"
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width=$1 ; shift
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test_line $gc 0
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if [ "$random" -a $width -gt 2 ]; then
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test_line $gc $((RANDOM % ($width - 2) + 1))
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fi
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test_line $gc $(($width - 1))
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test_no_line $gc $width
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done
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[ "${1:-}" ] && fail "missing expected chip of width $1"
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remove_module || fail "failed to remove module with error $?"
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}
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while getopts ":frvt:" opt; do
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case $opt in
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f)
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full_test=true
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;;
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r)
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random=true
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;;
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t)
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dev_type=$OPTARG
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;;
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v)
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verbose=true
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;;
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*)
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usage
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;;
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esac
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done
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shift $((OPTIND - 1))
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[ "${1:-}" ] && fail "unknown argument '$1'"
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prerequisite
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trap 'exit $ksft_fail' SIGTERM SIGINT
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trap cleanup EXIT
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case "$dev_type" in
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sysfs)
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source $BASE/gpio-mockup-sysfs.sh
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echo "WARNING: gpio sysfs ABI is deprecated."
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;;
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cdev_v1)
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echo "WARNING: gpio cdev ABI v1 is deprecated."
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uapi_opt="-u1 "
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;;
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cdev)
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;;
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*)
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fail "unknown interface type: $dev_type"
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;;
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esac
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remove_module || fail "can't remove existing $module module"
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# manual gpio allocation tests fail if a physical chip already exists
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[ "$full_test" -a -e "/dev/gpiochip0" ] && skip "full tests conflict with gpiochip0"
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echo "1. Module load tests"
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echo "1.1. dynamic allocation of gpio"
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insmod_test "-1,32" 32
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insmod_test "-1,23,-1,32" 23 32
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insmod_test "-1,23,-1,26,-1,32" 23 26 32
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if [ "$full_test" ]; then
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echo "1.2. manual allocation of gpio"
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insmod_test "0,32" 32
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insmod_test "0,32,32,60" 32 28
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insmod_test "0,32,40,64,64,96" 32 24 32
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echo "1.3. dynamic and manual allocation of gpio"
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insmod_test "-1,32,32,62" 32 30
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insmod_test "-1,22,-1,23,0,24,32,64" 22 23 24 32
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insmod_test "-1,32,32,60,-1,29" 32 28 29
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insmod_test "-1,32,40,64,-1,5" 32 24 5
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insmod_test "0,32,32,44,-1,22,-1,31" 32 12 22 31
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fi
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echo "2. Module load error tests"
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echo "2.1 gpio overflow"
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# Currently: The max number of gpio(1024) is defined in arm architecture.
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insmod_test "-1,1024"
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if [ "$full_test" ]; then
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echo "2.2 no lines defined"
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insmod_test "0,0"
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echo "2.3 ignore range overlap"
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insmod_test "0,32,0,1" 32
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insmod_test "0,32,1,5" 32
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insmod_test "0,32,30,35" 32
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insmod_test "0,32,31,32" 32
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insmod_test "10,32,30,35" 22
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insmod_test "10,32,9,14" 22
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insmod_test "0,32,20,21,40,56" 32 16
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insmod_test "0,32,32,64,32,40" 32 32
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insmod_test "0,32,32,64,36,37" 32 32
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insmod_test "0,32,35,64,34,36" 32 29
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insmod_test "0,30,35,64,35,45" 30 29
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insmod_test "0,32,40,56,30,33" 32 16
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insmod_test "0,32,40,56,30,41" 32 16
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insmod_test "0,32,40,56,39,45" 32 16
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fi
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echo "GPIO $module test PASS"
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