Re: Hotplugging USB Compact flash reader

[Ajay <a_ajay_sr@yahoo.com>]

I figured out enough of usb.agent to be able to trace
it to a point where I found that the handbook and the
userbook do not have a match for the VID-PID for the
reader that I'm using (it's an SCM ORCA cf-ms-sm-sd
reader). However I found that it loads (binds?) the
correct drivers. So in the "add" event I simply added
"mount /dev/sda /mnt/cf" and in the "remove" event I
unmounted it. All this is in usb.agent.

In Gnome this works fine - an icon comes to the
desktop without me having to do anything else. In KDE,
there is no icon, but the device is mounted.

My question is:
1. Is it correct to modify usb.agent itself? Should I
rather include the VID-PID and other details in 
the handbook/userbook?

2. What is the "match-flag"?? AFAI can see it seems to
be a "mask flag" - something to be 'anded' with
something else. What is the principle behind it?

3. This is premature, but could someone give me a hint
as to which desktop agent I should be talking to?

Thanks and regards,
Ajay.
 --- David Brownell <david-b@pacbell.net> wrote: >
Ajay wrote:
> > HI,
> > I am a first timer in this groups.
> > I am trying to develop something that can
> recognize
> > when a USB Flash card reader is plugged in, when a
> > media is plugged into the reader, and when either
> of
> > them are removed. Something like plug and play -
> just
> > plug in and an icon appears on the desktop which
> takes
> > you to the diectory. I guess hotplugging should
> have
> > the answer. 
> 
> You're asking about a missing piece, or maybe a
> couple.
> 
> - "disk level" hotplug events, reporting new storage
>    so that it can be mounted.  in 2.5 it seems like
>    at least the "scsi hotplug" may really happen,
> which
>    should solve your USB cardreader issue.
> 
> - hotplug events talking to X11 desktops
> 
> UNIX desktops traditionally "knew" that only a few
> devices
> might ever get new media, and polled things like
> diskette
> and cdrom devices from some desktop monitoring
> program.
> (Maybe not the same one polling for filesystem
> changes.)
> 
> Of Linux today, such devices can connect
> dynamically, so
> any "poll only these devices" architecture just
> loses.
> 
> One of the KDE or GNOME object model hooks ought to
> do
> nicely to let some hotplug agent talk to some
> service
> running inside the desktop, reusing infrastructure
> that'd
> otherwise need to be reinvented for a "raw X11"
> solution.
> 
> 
> > I read as much as I could but I can't figure out
> where
> > /sbin/hotplug and usb.agent fit in. How do I trap
> the
> > hotplug notification? Do I have to "register"? How
> do
> > I do that?
> 
> Considering that you'd need to design some of the
> hotplug
> events needed to address this problem,  you'll need
> to
> understand enough to create those answers yourself
> ... or
> wait for someone else to address them!  :)
> 
> The core observation will be that the hotplug agent
> for
> some TBD "storage hotplug event" would need to
> invoke some
> program that's permitted to talk to the relevant
> desktop
> service, which would pop up your desktop icon.
> 
> - Dave
> 
> 
> 
>
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