dt_stat

#!/bin/bash
# author: Frank Rowand  frank.rowand@sonymobile.com
# license: GPL V2
#_______________________________________________________________________________

script=`basename $0`
help=0


cmd_d=0
cmd_n=0
cmd_nb=0
cmd_nd=0
cmd_nxb=0
cmd_nxd=0

if [ $# -eq 0 ] ; then
	help=1
fi

while [ $# -gt 0 ]; do
	ARG=${1:1}

	case "$ARG" in
		h | -help)
			help=1
			break
			;;
		"d")
			cmd_d=1
			shift
			;;
		"n")
			cmd_n=1
			shift
			;;
		"nb")
			cmd_nb=1
			shift
			;;
		"nd")
			cmd_nd=1
			shift
			;;
		"nxb")
			cmd_nxb=1
			shift
			;;
		"nxd")
			cmd_nxd=1
			shift
			;;
		*)
			echo "ERROR: invalid parameter" 1>&2
			exit 1
			;;
	esac

done


#_______________________________________________________________________________

PDT="/proc/device-tree/"


#_______________________________________________________________________________

if [ ${help} -eq 1 ] ; then
	cat<<EOF 1>&2

usage:
   dt_stat

      -h         synonym for --help
      --help     print this message and exit

      -d        report devices
      -n        report nodes
      -nb       report nodes bound to a driver
      -nd       report nodes with a device
      -nxb      report nodes not bound to a driver
      -nxd      report nodes without a device

   Reports about nodes in /proc/device-tree/
   Nodes without a compatible string are not reported

   data fields reported:
      -d        Device Node
      -n        Node Compatible
      -nb       Node Compatible
      -nd       Node Compatible Device Driver
      -nxb      Node Compatible
      -nxd      Node Compatible
EOF
	exit 1
fi


#_______________________________________________________________________________
if [ ! -d /sys/devices ] ; then
	echo "ERROR: /sys/devices is not a directory"                                >&2
	exit 1
fi


if [ ! -d "$PDT" ] ; then
	echo "ERROR: ${PDT} is not a directory"                                      >&2
	exit 1
fi

# ==============================================================================
# COLLECT DATA

UEVENTS="$(find /sys/devices -name uevent)"

#-----  nodes of devices with an OF_FULLNAME in uevent
#-----  nodes with a device that has been bound to a driver
NODES_DEV=""
function get_nodes_dev() {
	for dev in $UEVENTS; do
		grep '^OF_FULLNAME=' "${dev}" | sed -e 's|OF_FULLNAME=||'
	done | sort
}
function nodes_dev() {
	if [ -z "$NODES_DEV" ]; then
		NODES_DEV="$(get_nodes_dev)"
	fi
	echo "$NODES_DEV"
}

NODES_DEV_BOUND=""
function get_nodes_dev_bound() {
	for uevent in $UEVENTS; do
		grep '^OF_FULLNAME=' "${uevent}" | sed -e 's|OF_FULLNAME=||'
	done | sort
}

function nodes_dev_bound() {
	if [ -z "$NODES_DEV_BOUND" ]; then
		NODES_DEV_BOUND="$(get_nodes_dev_bound)"
	fi
	echo "$NODES_DEV_BOUND"
}

#-----  nodes with a compatible property
NODES_COMPAT=""
function get_nodes_compat() {
	local D
	for node in `find "${PDT}" -name compatible -type f`; do
		D=$(dirname "${node}")
		echo "$D" | sed -e 's|\/proc\/device-tree||'
	done | sort
}
function nodes_compat() {
	if [ -z "$NODES_COMPAT" ]; then
		NODES_COMPAT="$(get_nodes_compat)"
	fi
	echo "$NODES_COMPAT"
}

TABS='		'

# ==============================================================================
# REPORTS

#-----  devices with an OF_FULLNAME in uevent

if [ ${cmd_d} -eq 1 ] ; then
	for dev in $UEVENTS; do
		if grep -q '^OF_FULLNAME' "${dev}" ; then
			node=$(grep '^OF_FULLNAME' "${dev}" | sed -e 's|OF_FULLNAME=||')
			echo $(dirname "${dev}") $TABS "${node}"
		fi
	done | sort
fi

#-----  nodes with a compatible property

if [ ${cmd_n} -eq 1 ] ; then
	for node in $(nodes_compat) ; do
		if [ -f "${PDT}/${node}/compatible" ]; then
			echo "$node" $TABS $(< "${PDT}/${node}/compatible")
		fi
	done
fi


#-----  nodes with device bound to driver
if [ ${cmd_nb} -eq 1 ] ; then
	for node in $(nodes_dev_bound) ; do
		if [ -f "$PDT/${node}/compatible" ]; then
			echo "${node}" $TABS $(< "$PDT/${node}/compatible")
		fi
	done
fi


#-----  nodes with a device

if [ ${cmd_nd} -eq 1 ] ; then
	for uevent in $UEVENTS; do
		if [ -f "$uevent" ]; then
			node=$(grep '^OF_FULLNAME=' "${uevent}" | sed -e 's|OF_FULLNAME=||')
			if [[ "${node}" != "" ]] ; then
				dev=$(dirname "${uevent}")
				# driver might be empty
				driver=$(grep '^DRIVER=' "${uevent}" | sed -e 's|DRIVER=||')
				echo "$node" $TABS $(< "${PDT}/${node}/compatible") $TABS "$dev" $TABS "$driver"
			fi
		fi
	done | sort
fi


#-----  nodes not bound to a driver

if [ ${cmd_nxb} -eq 1 ] ; then
	for node in $(nodes_compat); do
		if ! echo $(nodes_dev_bound) | grep -E -q "(^|)${node}( |\$)"; then
			echo "${node}" $TABS $(< "${PDT}/${node}/compatible")
		fi
	done
fi


#-----  nodes without a device

if [ ${cmd_nxd} -eq 1 ] ; then
	for node in $(nodes_compat); do
		if ! echo $(nodes_dev) | grep -E -q "(^|)${node}( |\$)"; then
			echo "${node}" $TABS $(< "${PDT}/${node}/compatible")
		fi
	done
fi