Re: receiving USB hotplug notifications on gadgets

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Tue, 31 Oct 2006 rockwell618@xxxxxxxxx wrote:

> Alan,
> 
> Uh-oh, that's bad news.  Rather than relying on notifications I
> suppose I could create a simple daemon that watched for the presence
> of certain indicators that a USB connection has been made or broken on
> the gadget.  I could, that is, if I knew of any such indicators.
> 
> Are you aware of any system or driver state information that I could
> poll periodically to infer the presence/absence of a USB connection?

There isn't any.

But feel free to submit a patch adding a pollable sysfs attribute file or 
a uevent notifier.  Ideally the same interface should be added to each 
of the USB device controller drivers.

Alan Stern


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