[linux-usb-devel] [PATCH 1/5] USB: Make usb_hcd_irq work for multi-role USB controllers w/ shared irq

[Grant Likely]

On 11/24/07, Alan Cox <alan at lxorguk.ukuu.org.uk> wrote:
> On Fri, 23 Nov 2007 21:10:39 -0800
> Greg KH <gregkh at suse.de> wrote:
>
> > On Fri, Nov 23, 2007 at 05:24:31PM -0700, Grant Likely wrote:
> > > From: Peter Korsgaard <peter.korsgaard at barco.com>
> > >
> > > Some multi-role (host/peripheral) USB controllers use a shared interrupt
> > > line for all parts of the chip. Export usb_hcd_irq so drivers can call it
> > > from their interrupt handler instead of duplicating code.
> > > Drivers pass an irqnum of 0 to usb_add_hcd to signal that the interrupt handler
> > > shouldn't be registerred by the core.
> >
> > What about for platforms where irq 0 is a valid irq?
>
> There are no such platforms. Linus made that absolutely clear every time
> this came up before
>
>         0       -       No IRQ
>
> A platform with a physical or bus IRQ of 0 needs to remap it to a
> different constant.

Regardless, I should probably use the NO_IRQ macro instead.

g.

-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
grant.likely at secretlab.ca
(403) 399-0195