From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Peter B. West" <lists@pbw.id.au>
Date: Thu, 09 Sep 2004 00:00:26 +0000
Subject: Questions on hotplug with 2.6 kernels
Message-Id: <413F9D1A.2020001@pbw.id.au>
List-Id: <linux-hotplug.vger.kernel.org>
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To: linux-hotplug@vger.kernel.org

I am attempting to set up hotplug for my USB adsl modem on a Fedora 2=20
system.  I notice that FC2 does not include a /etc/rc.s/init.d/hotplug=20
file.  Any idea why not?  Any idea what process FC2 uses to set up hotplug?

I have a number of questions about the 2.6 kernel support in hotplug.=20
If this is completely unnecessary to getting hotplug working well,=20
please just refer me to what I need to get that going, and ignore the=20
questions that follow.

In /etc/hotplug/usb.rc is the following:

usb_boot_events ()
{
         #
         # FIXME on 2.5, /sys/bus/usb/devices/* gives all of the
         # info we need.  Interface hotplug events come from the
         # "*:*" files, and device events (do them first) come
         # from the others.
         #
         # don't expect usbmodules to exist!!  and remove the
         # dependency (below) on usbfs to decide whether we should
         # be synthesizing coldplug events.
         #

         # synthesize hotplug events if we can
         # we need (non-bash) programs to parse descriptors.
         LISTER=3D`which usbmodules`
         if [ "$LISTER" =3D "" -o ! -f /proc/bus/usb/devices ]; then
                 echo $"** can't synthesize root hub events"
                 return
         fi

I have some questions about this.  Is the "dependency (below) on usbfs"=20
the "[ "$LISTER" =3D "" -o ! -f /proc/bus/usb/devices ]" test?

What changes do I need to make to support the 2.6 kernel?  What is made=20
redundant by /sys/bus/usb/devices/* ?  Is usbmodules required in 2.6?

On my system, /sys/bus/usb/devices/ has
1-0:1.0  2-0:1.0  2-3  2-3:1.0  3-0:1.0  usb1  usb2  usb3

According to the comment, "device events (do them first)" come from the=20
usb[1-3] files.  Does the "do them first" refer to the changes to the=20
code, or the order of processing the files?  What code is made redundant=20
by these device events?  How do I extract device events from these files?

The 1-0:1.0, 2-0:1.0, 2-3, 2-3:1.0, 3-0:1.0 files provide the interface=20
hotplug events.  How do I access these?  What code is made redundant by=20
them?

In the above configuration, I have only one device connected.  From=20
/proc/bus/usb/devices
T:  Bus=02 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#=3D  2 Spd=12  MxCh=3D 0
D:  Ver=3D 1.10 Cls=FF(vend.) Sub=FF Prot=FF MxPSd #Cfgs=3D  1
P:  Vendor 01 ProdIDQ00 Rev=3D 1.00
S:  Manufacturer=3DGlobespanVirata, Inc.
S:  Product=3DUSB-ADSL Modem

I presume that the Bus=02, Port=02, Dev#=3D 2 translates into 2-3:1.0.

All hints gratefully received.

Peter


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