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usb.agent
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2006-05-01
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#!/bin/sh
#
# USB-specific hotplug policy agent.
#
# This should handle 2.2.18+, 2.4.*, and 2.5.* USB hotplugging,
# with a consistent framework for adding device and driver
# specific handling.
#
# Normally, adding a usb device will modprobe a driver. If there
# is a /etc/hotplug/usb/$DRIVER script set up, it will also run,
# handling tasks like loading firmware or starting daemons.
#
# Kernel USB hotplug params include:
#
# ACTION=%s [add or remove]
# DEVPATH=%s [in 2.5 kernels, /sys/$DEVPATH]
# PRODUCT=%x/%x/%x
# INTERFACE=%d/%d/%d [ for interface 0, if TYPE=0/*/* ]
# TYPE=%d/%d/%d
#
# And if usbfs (originally called usbdevfs) is configured, also:
#
# DEVFS=/proc/bus/usb [gone in 2.5]
# DEVICE=/proc/bus/usb/%03d/%03d
#
# This script then adds the variable:
#
# REMOVER=/var/run/usb/<some string unique to $DEVICE>
#
# This is the path where the script would like to find a remover, if
# the target device needs one. This script is executed on remove if
# it is executable when the remove happens.
#
# If usbfs is mounted on /proc/bus/usb, $DEVICE is a file which
# can be read to get the device's current configuration descriptor.
# (The "usbmodules" utility does that.) Or it can be used by a
# user mode driver to interact with the usb device. USB hotplug
# does *not* require usbfs (or sysfs) to work, although on 2.4
# some devices work better if "usbmodules" can help.
#
# For Linux 2.5+ kernels, there's no need for "usbmodules". For
# two reasons: first, hotplug is invoked for each interface, not
# just the first one. Second, sysfs exposes descriptors so they
# are easy to use for "coldplug" event simulation. (But sysfs is
# not a replacement for the driver I/O capabilities in usbfs.)
#
# On systems using Linux 2.4.* kernels, be sure to use the right
# modutils (2.4.2+). That ensures that hotplugging uses the list
# of modules installed for your kernel, rather than the one that's
# included here for use on systems without MODULE_DEVICE_TABLE
# support.
#
#
# HISTORY:
#
# 20-Nov-2002 some 2.5 updates; handle new 'device' hotplug; turn off
# 'sleep' hack since hcds must all queue control traffic
# 08-Aug-2002 support for multiple usermaps (maxk), minor cleanup
# 18-Jan-2002 fix match algorithm in usb_map_modules()
# 14-Jan-2002 fix work around 2.2 brokeness of $PRODUCT
# 09-Jan-2002 REMOVER for system without usbdevfs
#
# 14-Mar-2001 Cleanup, bitmask the match_flags
# 26-Feb-2001 Cleanup, support comments (Gioele Barabucci)
# 15-Feb-2001 Remove use of "<<" (Adam Richter)
# 23-Jan-2001 Update 2.2 handling; unfortunately there's no "feature
# test" that can work robustly
# 05-Jan-2001 Quick hack for kernel 2.4.0 and modutils 2.4.1
# 03-Jan-2001 Initial version of "new" hotplug agent, using feedback
# and contributions from Adam Richter, Ryan VanderBijl,
# Norbert Preining, Florian Lohoff, David Brownell and
# others. To replace the original /etc/usb/policy. (db)
#
# $Id: usb.agent,v 1.43 2004/09/20 22:50:11 kroah Exp $
#
if [ -f /etc/sysconfig/usb ]; then
. /etc/sysconfig/usb
fi
if [ -f /etc/conf.d/usb ]; then
. /etc/conf.d/usb
fi
cd /etc/hotplug
. ./hotplug.functions
# DEBUG=yes export DEBUG
# generated by modutils, for current 2.4.x (and later) kernels
MAP_CURRENT=$MODULE_DIR/modules.usbmap
# used if MAP_CURRENT is missing; for 2.2.x kernels
MAP_DISTMAP=$HOTPLUG_DIR/usb.distmap
#
# used for kernel drivers that don't show up in CURRENT or DISTMAP,
# currently input drivers (joysticks, keyboards, etc). newer systems
# should use input hotplug events instead.
#
MAP_HANDMAP=$HOTPLUG_DIR/usb.handmap
#
# used to run config scripts for user mode drivers (jPhoto, gPhoto2,
# rio500 tools, etc) ... instead of naming kernel modules, it names
# config scripts. those could change $DEVICE permissions, etc.
#
# for purely user mode drivers, scripts $HOTPLUG_DIR/usb/NAME should be
# installed with usermap files in $HOTPLUG_DIR/usb/NAME.usermap instead
# of continuing to use/modify $MAP_USERMAP
#
MAP_USERMAP=$HOTPLUG_DIR/usb.usermap
# accumulates list of modules we may care about
DRIVERS=""
if [ "$ACTION" = "" ]; then
mesg Bad USB agent invocation, no action
exit 1
fi
# starting in kernel 2.5 there are two kinds of USB hotplug events.
# - per-interface; 2.2/2.4 kernels only reported the first one.
# "new" events have nonzero /sys/$DEVPATH/bInterfaceNumber
# - per-device; "new" events don't have $PRODUCT
SYSFS=/sys
if [ "$PRODUCT" = "" ]; then
# this is either an error, or we're on a 2.5 system...
if [ "$DEVPATH" = "" ]; then
mesg Bad USB agent invocation
exit 1
fi
# sysfs files may already be gone
if [ $ACTION = 'remove' ]; then
exit 0
fi
# we could be running before usb populated these attributes...
if [ ! -f $SYSFS/$DEVPATH/bNumConfigurations ]; then
# FIXME wait till they appear, or N seconds elapse
sleep 2
fi
# this could care about changing the default config, or warning
# when the user hooked a fast device up so it runs slowly.
if [ ! -f $SYSFS/$DEVPATH/bNumConfigurations ]; then
exit 0
fi
TMP=$(cat $SYSFS/$DEVPATH/bNumConfigurations)
if [ $TMP -ne 1 ] && [ "$ACTION" = add ]; then
mesg Keeping default configuration with $SYSFS/$DEVPATH
fi
# NOTE: it might be good to add an extension hook here rather
# than ignore these events, but even device-scope tasks such
# as firmware download can still use the interface-0 event
# (as they did with 2.2/2.4 hotplug setup scripts).
exit 0
fi
# we can't "unset IFS" on bash1, so save a copy
DEFAULT_IFS="$IFS"
#
# Each modules.usbmap format line corresponds to one entry in a
# MODULE_DEVICE_TABLE(usb,...) declaration in a kernel file.
#
# Think of it as a database column with up to three "match specs"
# to associate kernel modules with particular devices or classes
# of device. The match specs provide a reasonably good filtering
# mechanism, but some driver probe() routines need to provide
# extra filtering.
#
usb_convert_vars ()
{
# work around 2.2.early brokenness
# munges the usb_bcdDevice such that it is a integer rather
# than a float: e.g. 1.0 become 0100
PRODUCT=`echo $PRODUCT | sed -e "s+\.\([0-9]\)$+.\10+" -e "s/\.$/00/" \
-e "s+/\([0-9]\)\.\([0-9][0-9]\)+/0\1\2+" \
-e "s+/\([0-9][0-9]\)\.\([0-9][0-9]\)+/\1\2+"`
set $(echo $PRODUCT | sed -e 's+\([^/]*\)/\([^/]*\)/\(.*\)+\1 \2 \3+')
usb_idVendor=$((0x$1))
usb_idProduct=$((0x$2))
usb_bcdDevice=$((0x$3))
if [ "$TYPE" != "" ]; then
IFS=/
set $TYPE ''
usb_bDeviceClass=$1
usb_bDeviceSubClass=$2
usb_bDeviceProtocol=$3
IFS="$DEFAULT_IFS"
elif [ -r $SYSFS/$DEVPATH/bDeviceClass ]; then
usb_bDeviceClass=$((0x$(cat $SYSFS/$DEVPATH/bDeviceClass)))
usb_bDeviceSubClass=$((0x$(cat $SYSFS/$DEVPATH/bDeviceSubClass)))
usb_bDeviceProtocol=$((0x$(cat $SYSFS/$DEVPATH/bDeviceProtocol)))
else
# out-of-range values
usb_bDeviceClass=1000
usb_bDeviceSubClass=1000
usb_bDeviceProtocol=1000
fi
if [ "$INTERFACE" != "" ]; then
IFS=/
set $INTERFACE ''
usb_bInterfaceClass=$1
usb_bInterfaceSubClass=$2
usb_bInterfaceProtocol=$3
IFS="$DEFAULT_IFS"
elif [ -r $SYSFS/$DEVPATH/bInterfaceClass ]; then
usb_bInterfaceClass=$((0x$(cat $SYSFS/$DEVPATH/bInterfaceClass)))
usb_bInterfaceSubClass=$((0x$(cat $SYSFS/$DEVPATH/bInterfaceSubClass)))
usb_bInterfaceProtocol=$((0x$(cat $SYSFS/$DEVPATH/bInterfaceProtocol)))
else
# out-of-range values
usb_bInterfaceClass=1000
usb_bInterfaceSubClass=1000
usb_bInterfaceProtocol=1000
fi
}
USB_MATCH_VENDOR=$((0x0001))
USB_MATCH_PRODUCT=$((0x0002))
USB_MATCH_DEV_LO=$((0x0004))
USB_MATCH_DEV_HI=$((0x0008))
USB_MATCH_DEV_CLASS=$((0x0010))
USB_MATCH_DEV_SUBCLASS=$((0x0020))
USB_MATCH_DEV_PROTOCOL=$((0x0040))
USB_MATCH_INT_CLASS=$((0x0080))
USB_MATCH_INT_SUBCLASS=$((0x0100))
USB_MATCH_INT_PROTOCOL=$((0x0200))
#
# stdin is "modules.usbmap" syntax
# on return, all matching modules were added to $DRIVERS
#
usb_map_modules ()
{
# look at each usb_device_id entry
# collect all matches in $DRIVERS
while read line
do
# comments are lines that start with "#" ...
# be careful, they still get parsed by bash!
case "$line" in
\#*) continue ;;
"") continue ;;
esac
set $line
module=$1
match_flags=$(($2))
idVendor=$(($3))
idProduct=$(($4))
bcdDevice_lo=$(($5))
bcdDevice_hi=$(($6))
bDeviceClass=$(($7))
bDeviceSubClass=$(($8))
bDeviceProtocol=$(($9))
shift 9
bInterfaceClass=$(($1))
bInterfaceSubClass=$(($2))
bInterfaceProtocol=$(($3))
: checkmatch $module
: idVendor $idVendor $usb_idVendor
if [ $USB_MATCH_VENDOR -eq $(( $match_flags & $USB_MATCH_VENDOR )) ] &&
[ $idVendor -ne $usb_idVendor ]; then
continue
fi
: idProduct $idProduct $usb_idProduct
if [ $USB_MATCH_PRODUCT -eq $(( $match_flags & $USB_MATCH_PRODUCT )) ] &&
[ $idProduct -ne $usb_idProduct ]; then
continue
fi
: bcdDevice range $bcdDevice_hi $bcdDevice_lo actual $usb_bcdDevice
if [ $USB_MATCH_DEV_LO -eq $(( $match_flags & $USB_MATCH_DEV_LO )) ] &&
[ $usb_bcdDevice -lt $bcdDevice_lo ]; then
continue
fi
# bcdDevice_lo <= bcdDevice <= bcdDevice_hi
if [ $USB_MATCH_DEV_HI -eq $(( $match_flags & $USB_MATCH_DEV_HI )) ] &&
[ $usb_bcdDevice -gt $bcdDevice_hi ]; then
continue
fi
: bDeviceClass $bDeviceClass $usb_bDeviceClass
if [ $USB_MATCH_DEV_CLASS -eq $(( $match_flags & $USB_MATCH_DEV_CLASS )) ] &&
[ $bDeviceClass -ne $usb_bDeviceClass ]; then
continue
fi
: bDeviceSubClass $bDeviceSubClass $usb_bDeviceSubClass
if [ $USB_MATCH_DEV_SUBCLASS -eq $(( $match_flags & $USB_MATCH_DEV_SUBCLASS )) ] &&
[ $bDeviceSubClass -ne $usb_bDeviceSubClass ]; then
continue
fi
: bDeviceProtocol $bDeviceProtocol $usb_bDeviceProtocol
if [ $USB_MATCH_DEV_PROTOCOL -eq $(( $match_flags & $USB_MATCH_DEV_PROTOCOL )) ] &&
[ $bDeviceProtocol -ne $usb_bDeviceProtocol ]; then
continue
fi
# NOTE: for now, this only checks the first of perhaps
# several interfaces for this device.
: bInterfaceClass $bInterfaceClass $usb_bInterfaceClass
if [ $USB_MATCH_INT_CLASS -eq $(( $match_flags & $USB_MATCH_INT_CLASS )) ] &&
[ $bInterfaceClass -ne $usb_bInterfaceClass ]; then
continue
fi
: bInterfaceSubClass $bInterfaceSubClass $usb_bInterfaceSubClass
if [ $USB_MATCH_INT_SUBCLASS -eq $(( $match_flags & $USB_MATCH_INT_SUBCLASS )) ] &&
[ $bInterfaceSubClass -ne $usb_bInterfaceSubClass ]; then
continue
fi
: bInterfaceProtocol $bInterfaceProtocol $usb_bInterfaceProtocol
if [ $USB_MATCH_INT_PROTOCOL -eq $(( $match_flags & $USB_MATCH_INT_PROTOCOL )) ] &&
[ $bInterfaceProtocol -ne $usb_bInterfaceProtocol ]; then
continue
fi
# It was a match!
DRIVERS="$module $DRIVERS"
: drivers $DRIVERS
done
}
#
# declare a REMOVER name that the add action can use to create a
# remover, or that the remove action can use to execute a remover.
#
if [ "$DEVPATH" != "" ]; then
# probably, 2.6.x
REMOVER=/var/run/usb/$(readlink -f $SYSFS/$DEVPATH | sed -e 's;/;%;g')
elif [ "$DEVICE" != "" ]; then
# 2.4.x?
REMOVER=/var/run/usb/$(echo $DEVICE | sed -e 's;/;%;g')
else
# should not happen?
REMOVER=/var/run/usb/$(echo "$INTERFACE/$PRODUCT/$TYPE" | sed -e 's;/;%;g')
fi
export REMOVER
#
# What to do with this USB hotplug event?
#
case $ACTION in
add)
# partial workaround for 2.4 uhci/usb-uhci driver problem: they don't
# queue control requests, so device drivers can confuse each other if
# they happen to issue requests at the same time ... it happens easily
# with slow HID devices and "usbmodules".
# starting with 2.5 (DEVPATH set), all hcds must queue control traffic.
if [ "$DEVPATH" = "" ]; then
sleep 3
fi
usb_convert_vars
FOUND=false
if [ -f $SYSFS/$DEVPATH/manufacturer ]; then
LABEL="USB `cat $SYSFS/$DEVPATH/manufacturer` `cat $SYSFS/$DEVPATH/product`"
else
LABEL="USB product $PRODUCT"
fi
if [ -e "$REMOVER" ]; then
rm -f "$REMOVER"
fi
# on 2.4 systems, modutils 2.4.2+ maintains MAP_CURRENT
# ... otherwise we can't rely on it (sigh)
case "$KERNEL" in
2.4.*|2.5.*|2.6.*)
if [ -r $MAP_CURRENT ]; then
load_drivers usb $MAP_CURRENT "$LABEL"
fi;;
*)
if [ -r $MAP_DISTMAP ]; then
load_drivers usb $MAP_DISTMAP "$LABEL"
fi;;
esac
if [ "$DRIVERS" != "" ]; then
FOUND=true
fi
# cope with special driver module configurations
# (mostly HID devices, until we have an input.agent)
# not needed on 2.6 - they are loaded by hotplug
case "$KERNEL" in
2.6.* )
: nothing
;;
* )
if [ -r $MAP_HANDMAP ]; then
load_drivers usb $MAP_HANDMAP "$LABEL"
if [ "$DRIVERS" != "" ]; then
FOUND=true
fi
fi
;;
esac
# some devices have user-mode drivers (no kernel module, but config)
# or specialized user-mode setup helpers
MODPROBE=:
for MAP in $MAP_USERMAP $HOTPLUG_DIR/usb/*.usermap
do
if [ -r $MAP ]; then
load_drivers usb $MAP "$LABEL"
if [ "$DRIVERS" != "" ]; then
FOUND=true
fi
fi
done
if [ "$FOUND" = "false" ]; then
debug_mesg "... no modules for $LABEL"
exit 2
fi
;;
remove)
if [ -x $REMOVER ]; then
$REMOVER
fi
rm -f $REMOVER
if [ -x /usr/sbin/updfstab ]; then
/usr/sbin/updfstab
fi
;;
*)
debug_mesg USB $ACTION event not supported
exit 1
;;
esac