[Linux] hotplug & firmware loading

#!/bin/sh

#########################################

# USB Port on FH7200

#

# REAR  : ehci-brcm.0 -> BUSNUM=001

# INNER : ehci-brcm.1 -> BUSNUM=002

# FRONT : ehci-brcm.2 -> BUSNUM=003

#########################################

# set to '1' to enable USB thumbdrive automount

AUTOMOUNT=1

AUTOMOUNT_REAR_POINT="/mnt/usbrear"

AUTOMOUNT_RSS_POINT="/mnt/rss"

AUTOMOUNT_FRONT_POINT="/mnt/usb"

SAVED_REAR_DEVPATH="/tmp/saved-usbrear-devpath"

SAVED_RSS_DEVPATH="/tmp/saved-rss-devpath"

SAVED_FRONT_DEVPATH="/tmp/saved-usb-devpath"

AUTOMOUNT_FS="vfat"

HOTPLUG_FW_DIR=/lib/firmware

# on boot (option : -s)

if [ "$1" = "-s" ]; then

for i in /sys/block/sd*/*/dev 

do

if [ -f $i ]; then

DEV=$(echo $i | sed -e 's@/dev@@' -e 's@.*/@@')

BLKDEV=$(echo $DEV | cut -c1-3)

BLKDEVPATH=`readlink /sys/block/$BLKDEV/device`

DEVPATH="/block/$BLKDEV/$DEV" 

if [[ "$BLKDEVPATH" == *usb1* ]]; then

echo $DEVPATH > $SAVED_REAR_DEVPATH

exec mount /dev/${DEV} ${AUTOMOUNT_REAR_POINT} -o iocharset=utf8

if [ $? -ne 0 ]; then

exec mount /dev/${DEV} ${AUTOMOUNT_REAR_POINT}

fi

elif [[ "$BLKDEVPATH" == *usb2* ]]; then

echo $DEVPATH > $SAVED_RSS_DEVPATH

exec mount /dev/${DEV} ${AUTOMOUNT_RSS_POINT} -o data=journal

elif [[ "$BLKDEVPATH" == *usb3* ]]; then

echo $DEVPATH > $SAVED_FRONT_DEVPATH

exec mount /dev/${DEV} ${AUTOMOUNT_FRONT_POINT} -o iocharset=utf8

if [ $? -ne 0 ]; then

exec mount /dev/${DEV} ${AUTOMOUNT_FRONT_POINT}

fi

fi

fi

done

fi

# userspace firmware loader

if [ "$1" = "firmware" ]; then

if [ "$ACTION" = "add" ]; then

echo 1 > /sys/$DEVPATH/loading

cat $HOTPLUG_FW_DIR/$FIRMWARE > /sys/$DEVPATH/data

echo 0 > /sys/$DEVPATH/loading

fi

fi

# network hotplug

# NOTE: this only operates on real NICs (ethN), not lo/br0/sit0/etc.

if [ "$1" = "net" -a -e /sys/class/net/$INTERFACE/device ]; then

if [ "$ACTION" = "add" ]; then

/sbin/ifup $INTERFACE

elif [ "$ACTION" = "remove" ]; then

/sbin/ifdown $INTERFACE

fi

fi

# USB automount (only works with bash)

if [[ "$ACTION" = "remove" && "$1" = "block" ]]; then

if [[ -e $SAVED_REAR_DEVPATH ]]; then

USB_DEVPATH=`cat $SAVED_REAR_DEVPATH`

if [[ "$DEVPATH" = "$USB_DEVPATH" ]]; then

rm -f $SAVED_REAR_DEVPATH

exec umount -l ${AUTOMOUNT_REAR_POINT}

fi

fi

if [[ -e $SAVED_RSS_DEVPATH ]]; then

USB_DEVPATH=`cat $SAVED_RSS_DEVPATH`

if [[ "$DEVPATH" = "$USB_DEVPATH" ]]; then

rm -f $SAVED_RSS_DEVPATH

exec umount -l ${AUTOMOUNT_RSS_POINT}

fi

fi

if [[ -e $SAVED_FRONT_DEVPATH ]]; then

USB_DEVPATH=`cat $SAVED_FRONT_DEVPATH`

if [[ "$DEVPATH" = "$USB_DEVPATH" ]]; then

rm -f $SAVED_FRONT_DEVPATH

exec umount -l ${AUTOMOUNT_FRONT_POINT}

fi

fi

fi

# PHYSDEV* vars were removed in 2.6.37

if [ -z "$PHYSDEVPATH" ]; then

# for DEVPATH = /block/sda/sda1

PHYSDEVPATH=`readlink /sys/$DEVPATH/../device`

PHYSDEVDRIVER=`readlink /sys/$DEVPATH/../device/driver`

fi

if [[ "$AUTOMOUNT" = "1" && "$1" = "block" && "$ACTION" = "add" ]]; then

if [[ "$PHYSDEVPATH" == *usb1* ]]; then

if [[ ! -e $SAVED_REAR_DEVPATH && "$PHYSDEVDRIVER" = *sd && $[ ($MINOR % 16) == 1 ] ]]; then

DEV=${DEVPATH##*/}

echo $DEVPATH > $SAVED_REAR_DEVPATH

exec mount /dev/${DEV} ${AUTOMOUNT_REAR_POINT} -o iocharset=utf8

if [ $? -ne 0 ]; then

exec mount /dev/${DEV} ${AUTOMOUNT_REAR_POINT}

fi

fi

elif [[ "$PHYSDEVPATH" == *usb2* ]]; then

if [[ ! -e $SAVED_RSS_DEVPATH && "$PHYSDEVDRIVER" = *sd && $[ ($MINOR % 16) == 1 ] ]]; then

DEV=${DEVPATH##*/}

echo $DEVPATH > $SAVED_RSS_DEVPATH

exec mount /dev/${DEV} ${AUTOMOUNT_RSS_POINT} -o data=journal

fi

elif [[ "$PHYSDEVPATH" == *usb3* ]]; then

if [[ ! -e $SAVED_FRONT_DEVPATH && "$PHYSDEVDRIVER" = *sd && $[ ($MINOR % 16) == 1 ] ]]; then

DEV=${DEVPATH##*/}

echo $DEVPATH > $SAVED_FRONT_DEVPATH

exec mount /dev/${DEV} ${AUTOMOUNT_FRONT_POINT} -o iocharset=utf8

if [ $? -ne 0 ]; then

exec mount /dev/${DEV} ${AUTOMOUNT_FRONT_POINT}

fi

fi

fi

fi

Here's a C program to print hotplug nelink events to stdout:

hnetlink.c

참조 :

http://lwn.net/Articles/242046/

https://www.kernel.org/doc/pending/hotplug.txt