Re: udev vs. devfs

[David Brownell <david-b@pacbell.net>]

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On Friday 17 June 2005 12:21 pm, David Brownell wrote:
> On Thursday 16 June 2005 10:10 am, Vassilis Virvilis wrote:
> > ...
> > I am sure somebody will popup with a better script/procedure or something
> > but anyway here are my 2dr.
> 
> It hit the spot for me, pretty much.  Here are my updated versions;
> 

Whoops, HERE they are.

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#!/bin/ash
#
# "coldplug" ensures every hardware device present has its driver loaded,
# even if its hotplug event was ignored since it was too early in system
# startup for hotplug processing to work.  Loading the driver will cause
# another hotplug event that will lead to /dev node creation.
#
# Run this during system startup shortly after /dev has been initialized
# using udevstart.

if [ ! -d /sys/devices ]
then
	exit 1
fi

# "new style" kernel hotplug has module-init-tools do the thinking
cd /sys/devices
for DIR in $(find . -type d)
do
	if [ -f $DIR/modalias -a ! -f $DIR/driver ]
	then
		modprobe -q $(cat $DIR/modalias)
	fi
done

# FIXME will MODULE_ALIAS("name.*") work for "name.3" devices?
cd /sys/devices/platform
for DEV in *
do
	if [ ! -L $DEV/driver ]
	then
		# some platform drivers will need a MODULE_ALIAS()
		modprobe -q $DEV
	fi
done

# REVISIT pcmcia doesn't yet have "modalias" files
if [ -d /sys/bus/pcmcia/devices ]
then
	cd /sys/bus/pcmcia/devices
	for F in *
	do
		modprobe -q $(pcmcia-modalias $F)
	done
fi


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#!/bin/ash
#
# "hotplug" initializes devices ... hardware drivers get modprobed and
# create class devices.  then later udev handles /dev node creation and
# invokes programs that make userspace aware of the new device node.
#
# install as /sbin/hotplug

if [ ! -d /sys ]
then
	exit 1
fi
cd /sys

if [ "$ACTION" = "add" -a "$SUBSYSTEM" = "mmc" ]
then
	# MMC doesn't support modalias yet, but mmc_block is
	# the only useful option until Linux gets SDIO support.
	MODALIAS=mmc_block
fi

if [ "$ACTION" = "add" -a -n "$MODALIAS" -a ! -L $DEVPATH/driver ]
then
	# REVISIT:  pcmcia currently needs special cases here,
	# for non-static mapped sockets and many CF memory cards.

	# most important subsystems now have $MODALIAS support:
	modprobe -q $MODALIAS
fi

if [ -n "$DEVPATH" ]
then
	/sbin/udevsend $1
fi