1#!/bin/sh 2# SPDX-License-Identifier: GPL-2.0 3# Copyright (C) 2021 Bartosz Golaszewski <brgl@bgdev.pl> 4 5BASE_DIR=`dirname $0` 6CONFIGFS_DIR="/sys/kernel/config/gpio-sim" 7MODULE="gpio-sim" 8 9fail() { 10 echo "$*" >&2 11 echo "GPIO $MODULE test FAIL" 12 exit 1 13} 14 15skip() { 16 echo "$*" >&2 17 echo "GPIO $MODULE test SKIP" 18 exit 4 19} 20 21remove_chip() { 22 local CHIP=$1 23 24 for FILE in $CONFIGFS_DIR/$CHIP/*; do 25 BANK=`basename $FILE` 26 if [ "$BANK" = "live" -o "$BANK" = "dev_name" ]; then 27 continue 28 fi 29 30 LINES=`ls $CONFIGFS_DIR/$CHIP/$BANK/ | egrep ^line` 31 if [ "$?" = 0 ]; then 32 for LINE in $LINES; do 33 if [ -e $CONFIGFS_DIR/$CHIP/$BANK/$LINE/hog ]; then 34 rmdir $CONFIGFS_DIR/$CHIP/$BANK/$LINE/hog || \ 35 fail "Unable to remove the hog" 36 fi 37 38 rmdir $CONFIGFS_DIR/$CHIP/$BANK/$LINE || \ 39 fail "Unable to remove the line" 40 done 41 fi 42 43 rmdir $CONFIGFS_DIR/$CHIP/$BANK 44 done 45 46 rmdir $CONFIGFS_DIR/$CHIP || fail "Unable to remove the chip" 47} 48 49configfs_cleanup() { 50 for CHIP in `ls $CONFIGFS_DIR/`; do 51 remove_chip $CHIP 52 done 53} 54 55create_chip() { 56 local CHIP=$1 57 58 mkdir $CONFIGFS_DIR/$CHIP 59} 60 61create_bank() { 62 local CHIP=$1 63 local BANK=$2 64 65 mkdir $CONFIGFS_DIR/$CHIP/$BANK 66} 67 68set_label() { 69 local CHIP=$1 70 local BANK=$2 71 local LABEL=$3 72 73 echo $LABEL > $CONFIGFS_DIR/$CHIP/$BANK/label || fail "Unable to set the chip label" 74} 75 76set_num_lines() { 77 local CHIP=$1 78 local BANK=$2 79 local NUM_LINES=$3 80 81 echo $NUM_LINES > $CONFIGFS_DIR/$CHIP/$BANK/num_lines || \ 82 fail "Unable to set the number of lines" 83} 84 85set_line_name() { 86 local CHIP=$1 87 local BANK=$2 88 local OFFSET=$3 89 local NAME=$4 90 local LINE_DIR=$CONFIGFS_DIR/$CHIP/$BANK/line$OFFSET 91 92 test -d $LINE_DIR || mkdir $LINE_DIR 93 echo $NAME > $LINE_DIR/name || fail "Unable to set the line name" 94} 95 96enable_chip() { 97 local CHIP=$1 98 99 echo 1 > $CONFIGFS_DIR/$CHIP/live || fail "Unable to enable the chip" 100} 101 102disable_chip() { 103 local CHIP=$1 104 105 echo 0 > $CONFIGFS_DIR/$CHIP/live || fail "Unable to disable the chip" 106} 107 108configfs_chip_name() { 109 local CHIP=$1 110 local BANK=$2 111 112 cat $CONFIGFS_DIR/$CHIP/$BANK/chip_name 2> /dev/null || \ 113 fail "unable to read the chip name from configfs" 114} 115 116configfs_dev_name() { 117 local CHIP=$1 118 119 cat $CONFIGFS_DIR/$CHIP/dev_name 2> /dev/null || \ 120 fail "unable to read the device name from configfs" 121} 122 123get_chip_num_lines() { 124 local CHIP=$1 125 local BANK=$2 126 127 $BASE_DIR/gpio-chip-info /dev/`configfs_chip_name $CHIP $BANK` num-lines || \ 128 fail "unable to read the number of lines from the character device" 129} 130 131get_chip_label() { 132 local CHIP=$1 133 local BANK=$2 134 135 $BASE_DIR/gpio-chip-info /dev/`configfs_chip_name $CHIP $BANK` label || \ 136 fail "unable to read the chip label from the character device" 137} 138 139get_line_name() { 140 local CHIP=$1 141 local BANK=$2 142 local OFFSET=$3 143 144 $BASE_DIR/gpio-line-name /dev/`configfs_chip_name $CHIP $BANK` $OFFSET || \ 145 fail "unable to read the line name from the character device" 146} 147 148sysfs_set_pull() { 149 local DEV=$1 150 local BANK=$2 151 local OFFSET=$3 152 local PULL=$4 153 local DEVNAME=`configfs_dev_name $DEV` 154 local CHIPNAME=`configfs_chip_name $DEV $BANK` 155 local SYSFSPATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio$OFFSET/pull" 156 157 echo $PULL > $SYSFSPATH || fail "Unable to set line pull in sysfs" 158} 159 160# Load the gpio-sim module. This will pull in configfs if needed too. 161modprobe gpio-sim || skip "unable to load the gpio-sim module" 162# Make sure configfs is mounted at /sys/kernel/config. Wait a bit if needed. 163for IDX in `seq 5`; do 164 if [ "$IDX" -eq "5" ]; then 165 skip "configfs not mounted at /sys/kernel/config" 166 fi 167 168 mountpoint -q /sys/kernel/config && break 169 sleep 0.1 170done 171# If the module was already loaded: remove all previous chips 172configfs_cleanup 173 174trap "exit 1" SIGTERM SIGINT 175trap configfs_cleanup EXIT 176 177echo "1. chip_name and dev_name attributes" 178 179echo "1.1. Chip name is communicated to user" 180create_chip chip 181create_bank chip bank 182enable_chip chip 183test -n `cat $CONFIGFS_DIR/chip/bank/chip_name` || fail "chip_name doesn't work" 184remove_chip chip 185 186echo "1.2. chip_name returns 'none' if the chip is still pending" 187create_chip chip 188create_bank chip bank 189test "`cat $CONFIGFS_DIR/chip/bank/chip_name`" = "none" || \ 190 fail "chip_name doesn't return 'none' for a pending chip" 191remove_chip chip 192 193echo "1.3. Device name is communicated to user" 194create_chip chip 195create_bank chip bank 196enable_chip chip 197test -n `cat $CONFIGFS_DIR/chip/dev_name` || fail "dev_name doesn't work" 198remove_chip chip 199 200echo "2. Creating and configuring simulated chips" 201 202echo "2.1. Default number of lines is 1" 203create_chip chip 204create_bank chip bank 205enable_chip chip 206test "`get_chip_num_lines chip bank`" = "1" || fail "default number of lines is not 1" 207remove_chip chip 208 209echo "2.2. Number of lines can be specified" 210create_chip chip 211create_bank chip bank 212set_num_lines chip bank 16 213enable_chip chip 214test "`get_chip_num_lines chip bank`" = "16" || fail "number of lines is not 16" 215remove_chip chip 216 217echo "2.3. Label can be set" 218create_chip chip 219create_bank chip bank 220set_label chip bank foobar 221enable_chip chip 222test "`get_chip_label chip bank`" = "foobar" || fail "label is incorrect" 223remove_chip chip 224 225echo "2.4. Label can be left empty" 226create_chip chip 227create_bank chip bank 228enable_chip chip 229test -z "`cat $CONFIGFS_DIR/chip/bank/label`" || fail "label is not empty" 230remove_chip chip 231 232echo "2.5. Line names can be configured" 233create_chip chip 234create_bank chip bank 235set_num_lines chip bank 16 236set_line_name chip bank 0 foo 237set_line_name chip bank 2 bar 238enable_chip chip 239test "`get_line_name chip bank 0`" = "foo" || fail "line name is incorrect" 240test "`get_line_name chip bank 2`" = "bar" || fail "line name is incorrect" 241remove_chip chip 242 243echo "2.6. Line config can remain unused if offset is greater than number of lines" 244create_chip chip 245create_bank chip bank 246set_num_lines chip bank 2 247set_line_name chip bank 5 foobar 248enable_chip chip 249test "`get_line_name chip bank 0`" = "" || fail "line name is incorrect" 250test "`get_line_name chip bank 1`" = "" || fail "line name is incorrect" 251remove_chip chip 252 253echo "2.7. Line configfs directory names are sanitized" 254create_chip chip 255create_bank chip bank 256mkdir $CONFIGFS_DIR/chip/bank/line12foobar 2> /dev/null && \ 257 fail "invalid configfs line name accepted" 258mkdir $CONFIGFS_DIR/chip/bank/line_no_offset 2> /dev/null && \ 259 fail "invalid configfs line name accepted" 260remove_chip chip 261 262echo "2.8. Multiple chips can be created" 263CHIPS="chip0 chip1 chip2" 264for CHIP in $CHIPS; do 265 create_chip $CHIP 266 create_bank $CHIP bank 267 enable_chip $CHIP 268done 269for CHIP in $CHIPS; do 270 remove_chip $CHIP 271done 272 273echo "2.9. Can't modify settings when chip is live" 274create_chip chip 275create_bank chip bank 276enable_chip chip 277echo foobar > $CONFIGFS_DIR/chip/bank/label 2> /dev/null && \ 278 fail "Setting label of a live chip should fail" 279echo 8 > $CONFIGFS_DIR/chip/bank/num_lines 2> /dev/null && \ 280 fail "Setting number of lines of a live chip should fail" 281remove_chip chip 282 283echo "2.10. Can't create line items when chip is live" 284create_chip chip 285create_bank chip bank 286enable_chip chip 287mkdir $CONFIGFS_DIR/chip/bank/line0 2> /dev/null && fail "Creating line item should fail" 288remove_chip chip 289 290echo "2.11. Probe errors are propagated to user-space" 291create_chip chip 292create_bank chip bank 293set_num_lines chip bank 99999 294echo 1 > $CONFIGFS_DIR/chip/live 2> /dev/null && fail "Probe error was not propagated" 295remove_chip chip 296 297echo "2.12. Cannot enable a chip without any GPIO banks" 298create_chip chip 299echo 1 > $CONFIGFS_DIR/chip/live 2> /dev/null && fail "Chip enabled without any GPIO banks" 300remove_chip chip 301 302echo "2.13. Duplicate chip labels are not allowed" 303create_chip chip 304create_bank chip bank0 305set_label chip bank0 foobar 306create_bank chip bank1 307set_label chip bank1 foobar 308echo 1 > $CONFIGFS_DIR/chip/live 2> /dev/null && fail "Duplicate chip labels were not rejected" 309remove_chip chip 310 311echo "2.14. Lines can be hogged" 312create_chip chip 313create_bank chip bank 314set_num_lines chip bank 8 315mkdir -p $CONFIGFS_DIR/chip/bank/line4/hog 316enable_chip chip 317$BASE_DIR/gpio-mockup-cdev -s 1 /dev/`configfs_chip_name chip bank` 4 2> /dev/null && \ 318 fail "Setting the value of a hogged line shouldn't succeed" 319remove_chip chip 320 321echo "3. Controlling simulated chips" 322 323echo "3.1. Pull can be set over sysfs" 324create_chip chip 325create_bank chip bank 326set_num_lines chip bank 8 327enable_chip chip 328sysfs_set_pull chip bank 0 pull-up 329$BASE_DIR/gpio-mockup-cdev /dev/`configfs_chip_name chip bank` 0 330test "$?" = "1" || fail "pull set incorrectly" 331sysfs_set_pull chip bank 0 pull-down 332$BASE_DIR/gpio-mockup-cdev /dev/`configfs_chip_name chip bank` 1 333test "$?" = "0" || fail "pull set incorrectly" 334remove_chip chip 335 336echo "3.2. Pull can be read from sysfs" 337create_chip chip 338create_bank chip bank 339set_num_lines chip bank 8 340enable_chip chip 341DEVNAME=`configfs_dev_name chip` 342CHIPNAME=`configfs_chip_name chip bank` 343SYSFS_PATH=/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/pull 344test `cat $SYSFS_PATH` = "pull-down" || fail "reading the pull failed" 345sysfs_set_pull chip bank 0 pull-up 346test `cat $SYSFS_PATH` = "pull-up" || fail "reading the pull failed" 347remove_chip chip 348 349echo "3.3. Incorrect input in sysfs is rejected" 350create_chip chip 351create_bank chip bank 352set_num_lines chip bank 8 353enable_chip chip 354DEVNAME=`configfs_dev_name chip` 355CHIPNAME=`configfs_chip_name chip bank` 356SYSFS_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/pull" 357echo foobar > $SYSFS_PATH 2> /dev/null && fail "invalid input not detected" 358remove_chip chip 359 360echo "3.4. Can't write to value" 361create_chip chip 362create_bank chip bank 363enable_chip chip 364DEVNAME=`configfs_dev_name chip` 365CHIPNAME=`configfs_chip_name chip bank` 366SYSFS_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/value" 367echo 1 > $SYSFS_PATH 2> /dev/null && fail "writing to 'value' succeeded unexpectedly" 368remove_chip chip 369 370echo "4. Simulated GPIO chips are functional" 371 372echo "4.1. Values can be read from sysfs" 373create_chip chip 374create_bank chip bank 375set_num_lines chip bank 8 376enable_chip chip 377DEVNAME=`configfs_dev_name chip` 378CHIPNAME=`configfs_chip_name chip bank` 379SYSFS_PATH="/sys/devices/platform/$DEVNAME/$CHIPNAME/sim_gpio0/value" 380test `cat $SYSFS_PATH` = "0" || fail "incorrect value read from sysfs" 381$BASE_DIR/gpio-mockup-cdev -s 1 /dev/`configfs_chip_name chip bank` 0 & 382sleep 0.1 # FIXME Any better way? 383test `cat $SYSFS_PATH` = "1" || fail "incorrect value read from sysfs" 384kill $! 385remove_chip chip 386 387echo "4.2. Bias settings work correctly" 388create_chip chip 389create_bank chip bank 390set_num_lines chip bank 8 391enable_chip chip 392$BASE_DIR/gpio-mockup-cdev -b pull-up /dev/`configfs_chip_name chip bank` 0 393test `cat $SYSFS_PATH` = "1" || fail "bias setting does not work" 394remove_chip chip 395 396echo "GPIO $MODULE test PASS" 397