Re: receiving USB hotplug notifications on gadgets

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Tue, 31 Oct 2006 rockwell618@xxxxxxxxx wrote:

> I am running 2.6.18 on a gumstix (GS) board and am having problems
> receiving hotplug notifications when a USB connection is established.
> The host side appears to be working normally.  However, the gadget
> side - the GS side - does not seem to be working.
> 
> I have written a simple hotplug script that is intended to be run
> whenever a USB connection is established with the GS gadget.
> 
> I confirmed that the  /proc/sys/kernel/hotplug file contains
> "/sbin/hotplug" and placed the script in /sbin/hotplug. The script
> looks something like:
> 
> if [ "$1" = "usb" ]
> then
>         if [ "$ACTION" = "add" ]
>         then
>                 # Do some things ....
>         fi
> fi
> ...
> 
> Trouble is that the gadget-side kernel never calls the script when the
> USB connection is established.   Again, everything appears to work
> fine on the host side.  The problem is with the gadget side.
> 
> Do I need to explicitly register for certain types of notifications?
> Or is there some other administrative step that is required in order
> to receive the hotplug notifications?

No and no.

> Would greatly appreciate a couple of pointers here.

The problem is that the kernel doesn't issue any notifications when a USB
connection is established or dropped on a gadget.  Probably the USB device 
controller drivers could be made to send these notifications, but right 
now none of them do.

Alan Stern


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