greybus: lsgb: add lsgb shell script

Horrid hack, but a start at making it easier for people to see what is
currently connected without having to deal with poking around in sysfs
directly.
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/lsgb

+#!/bin/sh
+#
+# 'ls greybus'
+#
+# Copyright 2016 Google Inc.
+# All rights reserved.
+#
+###############################################################################
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+# 1. Redistributions of source code must retain the above copyright notice,
+# this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+# 3. Neither the name of the copyright holder nor the names of its
+# contributors may be used to endorse or promote products derived from this
+# software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+###############################################################################
+
+# Horrid hack to just make it easier than poking around directly in sysfs
+# Don't rely on any of these fields to be stable, the layout is going to
+# change a lot over time.
+#
+
+print_interface() {
+	local devname=$1
+	local iid=`cat interface_id`
+	local vid=`cat vendor_id`
+	local pid=`cat product_id`
+	local version=`cat version`
+	local serial=`cat serial_number`
+	local vs=`cat vendor_string`
+	local ps=`cat product_string`
+	printf "Interface: %s %s:%s ver:%s \"%s\" \"%s\"\n"\
+		${iid} ${vid} ${pid} ${version} "${vs}" "${ps}"
+}
+
+print_bundle() {
+	local devname=$1
+	local id=`cat bundle_id`
+	local class=`cat bundle_class`
+	local class_type="unknown"
+	case ${class} in
+		"0x01" )	class_type="SVC"
+				;;
+		"0x02" )	class_type="GPIO"
+				;;
+		"0x03" )	class_type="I2C"
+				;;
+		"0x04" )	class_type="UART"
+				;;
+		"0x05" )	class_type="HID"
+				;;
+		"0x06" )	class_type="USB"
+				;;
+		"0x07" )	class_type="SDIO"
+				;;
+		"0x08" )	class_type="Power Supply"
+				;;
+		"0x09" )	class_type="PWM"
+				;;
+		"0x0a" )	class_type="unknown"
+				;;
+		"0x0b" )	class_type="SPI"
+				;;
+		"0x0c" )	class_type="Display"
+				;;
+		"0x0d" )	class_type="Camera"
+				;;
+		"0x0e" )	class_type="Sensoe"
+				;;
+		"0x0f" )	class_type="Lights"
+				;;
+		"0x10" )	class_type="Vibrator"
+				;;
+		"0x11" )	class_type="Loopback"
+				;;
+		"0x12" )	class_type="Audio Management"
+				;;
+		"0x13" )	class_type="Audio Data"
+				;;
+		"0x14" )	class_type="SVC"
+				;;
+		"0x15" )	class_type="Firmware"
+				;;
+		"0xfe" )	class_type="Raw"
+				;;
+		"0xff" )	class_type="Vendor"
+				;;
+	esac
+	printf "   Bundle: %s %s (%s)\n" ${id} ${class_type} ${class}
+}
+
+print_svc() {
+	local devname=$1
+	printf "      SVC: ${devname}\n"
+}
+
+print_host_device() {
+	local devname=$1
+	printf "     Host: ${devname}\n"
+}
+
+print_unknown() {
+	local devname=$1
+
+	printf "Unknown device type: ${devname}\n"
+}
+
+
+print_device() {
+	local dev=$1
+
+	[ -d $dev ] || return
+	cd $dev
+
+	local devname=`basename ${dev}`
+	local devtype=`cat uevent | grep DEVTYPE | cut -f 2 -d '='`
+	case ${devtype} in
+		greybus_interface )	print_interface ${devname}
+					;;
+		greybus_bundle )	print_bundle ${devname}
+					;;
+		greybus_svc )		print_svc ${devname}
+					;;
+		greybus_host_device )	print_host_device ${devname}
+					;;
+		* )			print_unknown ${devname}
+					;;
+	esac
+}
+
+for device in /sys/bus/greybus/devices/*
+do
+	print_device $device
+done