helper script to detect used linux modules

get-driver.sh

#!/bin/sh
#
# Find all modules and drivers for a given class device.
#
if [ $# != "1" ] ; then
    echo
    echo "Script to display the drivers and modules for a specified sysfs
    class device"
    echo "usage: $0 <CLASS_NAME>"
    echo
    echo "example usage:"
    echo "
    $0 sda"
    echo "Will show all drivers and modules for the sda block device."
    echo
    exit 1
fi
DEV=$1
if test -e "$1"; then
    DEVPATH=$1
else
    # find sysfs device directory for device
    DEVPATH=$(find /sys/class -name "$1" | head -1)
    test -z "$DEVPATH" && DEVPATH=$(find /sys/block -name "$1" | head -1)
    test -z "$DEVPATH" && DEVPATH=$(find /sys/bus -name "$1" | head -1)
    if ! test -e "$DEVPATH"; then
        echo "no device found"
        exit 1
    fi
fi
echo "looking at sysfs device: $DEVPATH"
if test -L "$DEVPATH"; then
    # resolve class device link to device directory
    DEVPATH=$(readlink -f $DEVPATH)
    echo "resolve link to: $DEVPATH"
fi
if test -d "$DEVPATH"; then
    # resolve old-style "device" link to the parent device
    PARENT="$DEVPATH";
    while test "$PARENT" != "/"; do
        if test -L "$PARENT/device"; then
            DEVPATH=$(readlink -f $PARENT/device)
            echo "follow 'device' link to parent: $DEVPATH"
            break
        fi
        PARENT=$(dirname $PARENT)
    done
fi
while test "$DEVPATH" != "/"; do
    DRIVERPATH=
    DRIVER=
    MODULEPATH=
    MODULE=
    if test -e $DEVPATH/driver; then
        DRIVERPATH=$(readlink -f $DEVPATH/driver)
        DRIVER=$(basename $DRIVERPATH)
        echo -n "found driver: $DRIVER"
        if test -e $DRIVERPATH/module; then
            MODULEPATH=$(readlink -f $DRIVERPATH/module)
            MODULE=$(basename $MODULEPATH)
            echo -n " from module: $MODULE"
        fi
        echo
    fi
    DEVPATH=$(dirname $DEVPATH)
done