Re: Can a USB gadget device initiate DMA transfer at the host?

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On Fri, Feb 06, 2009 at 06:54:11PM -0500, Aniruddha Marathe wrote:
> Hi,
> 
> I am writing a USB mass storage device gadget driver similar to the
> one already available (file backed storage). I am using PCI based
> Net2280 USB device controller.

What is lacking in the in-kernel driver that is causing you to want to
write your own?  Wouldn't it be better to work on the existing one to
add whatever you feel is lacking than to fork your own version?

> I need to know if there is any way my device can initiate a DMA
> transfer. If yes, (I know am being optimistic here) can it dictate the
> address at which the DMA r/w is to be performed? I would like to know
> the experts' comments on this.

usb gadgets have no control of DMA transfers on the host side, it's an
impossiblity.

sorry,

greg k-h
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