On Mon, 12 May 2014, Anastasija FEDANE wrote:

> Hi,
> 
> I am working on a project to simulate a usb device on a software level
> in Linux environment.

Do you realize that such a simulation already exists in the Linux 
kernel?

>  Do you know if it is possible to simulate a
> hardware event (such as voltage change to emulate the attach/detach
> event for usb, for example)?

It definitely is possible, and the existing simulation does it.

> Maybe there is a better approach? I am a newbie in this kind of
> development, so any advises are highly appreciated.

Take a look at drivers/usb/gadget/dummy_hcd.c.

Alan Stern

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