linux-stable/tools/testing/selftests/firmware/fw_lib.sh

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0

# Library of helpers for test scripts.
set -e

DIR=/sys/devices/virtual/misc/test_firmware

PROC_CONFIG="/proc/config.gz"
TEST_DIR=$(dirname $0)

print_reqs_exit()
{
	echo "You must have the following enabled in your kernel:" >&2
	cat $TEST_DIR/config >&2
	exit 1
}

test_modprobe()
{
	if [ ! -d $DIR ]; then
		print_reqs_exit
	fi
}

check_mods()
{
	trap "test_modprobe" EXIT
	if [ ! -d $DIR ]; then
		modprobe test_firmware
	fi
	if [ ! -f $PROC_CONFIG ]; then
		if modprobe configs 2>/dev/null; then
			echo "Loaded configs module"
			if [ ! -f $PROC_CONFIG ]; then
				echo "You must have the following enabled in your kernel:" >&2
				cat $TEST_DIR/config >&2
				echo "Resorting to old heuristics" >&2
			fi
		else
			echo "Failed to load configs module, using old heuristics" >&2
		fi
	fi
}

kconfig_has()
{
	if [ -f $PROC_CONFIG ]; then
		if zgrep -q $1 $PROC_CONFIG 2>/dev/null; then
			echo "yes"
		else
			echo "no"
		fi
	else
		# We currently don't have easy heuristics to infer this
		# so best we can do is just try to use the kernel assuming
		# you had enabled it. This matches the old behaviour.
		if [ "$1" = "CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y" ]; then
			echo "yes"
		elif [ "$1" = "CONFIG_FW_LOADER_USER_HELPER=y" ]; then
			if [ -d /sys/class/firmware/ ]; then
				echo yes
			else
				echo no
			fi
		fi
	fi
}