USB support

Stuffed Crust pizza at
Tue Jul 1 16:07:26 EDT 2008

On Tue, Jul 01, 2008 at 12:20:06PM -0400, Pavel Roskin wrote:
> There is little difference between Prism 2, Prism 2.5 and Prism 3 from
> the programming point of view.  That's the chipset names, whereas the
> driver only works with the MAC component directly, which should be the
> same.

The main differences between prism2 (hfa3841) and prism2.5/3 (hfa3842) 
were in the bus interface and RF sections; the actual MAC itself is 
progmatically identical, though the occasional bug cropped up that 
affected one but not the other as they used different firmware.
> I don't know if the chipset used in USB devices is Prism 2.5 or Prism 3,
> but I'm quite sure it's not Prism 2.  I would avoid using "3" in the
> driver name.  prism_usb sounds reasonable to me.

There were some USB prism2 devices, but they were never commercially 
produced.  All commercial USB widgets were of the prism2.5 or prism3 varieies.

The main difference between Prism2.5 and Prism3 is that the latter 
combined the baseband+RF chips, reducing the cost considerably.  They 
later added the option of eliminating the large onboard flash, 
requiring a runtime firmware download.

I forget where I was going with all of this.  Oh, yeah, you could just 
call the driver 'hfa3842_usb' instead.

 - Solomon
Solomon Peachy        		       pizza at shaftnet dot org	 
Melbourne, FL                          ^^ (mail/jabber/gtalk) ^^
Quidquid latine dictum sit, altum viditur.          ICQ: 1318344

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