Am Sonntag, 4. Juni 2006 20:22 schrieb John Que:
> Hello Oliver,
>
> I am sorry, but I think I don't understand ,
> You said:
> >A USB driver never will request an irq. Interrupt handling is done in
> > the core usb layer. Individual drivers have no business there.
>
> but in the zd1211 driver (not the rewrite version) I found this
> call to request an irq:
> request_irq(dev->irq, &zd1205_intr, SA_SHIRQ, dev->name, dev)
>
> Also when looking in the linux tree, I see some request_irq() calls in USB
> drivers, for exmaple in some drivers under usb/gadgaets, and more.
>
> Can you please elaborate a bit ? What do you mean by saying
> "A USB driver never will request an irq"?
The architecture is as follows:
device driver <---> USB core <---> host driver <=== USB ===> gadget driver
<---> function driver
Only those drivers that deal with the hardware directly request interrupts.
A device driver submits URBs and deals with callbacks.
Regards
Oliver
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