From: Oliver Neukum <oliver@neukum.org>
To: "John Que" <qwejohn@gmail.com>
Cc: "Daniel Drake" <dsd@gentoo.org>,
linux-usb-devel@lists.sourceforge.net,
"John W. Linville" <linville@tuxdriver.com>,
netdev@vger.kernel.org, "Ulrich Kunitz" <kune@deine-taler.de>
Subject: Re: [linux-usb-devel] [PATCH RFC] ZyDAS ZD1211 USB-WLAN driver
Date: Sun, 4 Jun 2006 21:06:17 +0200 [thread overview]
Message-ID: <200606042106.17870.oliver@neukum.org> (raw)
In-Reply-To: <ada605fb0606041122w36ad8320wa0a5d8241c98644c@mail.gmail.com>
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
next prev parent reply other threads:[~2006-06-04 19:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-03 11:20 [PATCH RFC] ZyDAS ZD1211 USB-WLAN driver Daniel Drake
2006-06-03 17:51 ` [linux-usb-devel] " Oliver Neukum
2006-06-03 19:35 ` Daniel Drake
2006-06-03 22:25 ` Oliver Neukum
2006-06-04 16:29 ` John Que
2006-06-04 17:17 ` Oliver Neukum
2006-06-04 18:03 ` Rami Rosen
2006-06-04 21:51 ` Daniel Drake
2006-06-04 18:22 ` John Que
2006-06-04 19:06 ` Oliver Neukum [this message]
2006-06-04 21:45 ` Daniel Drake
2006-06-06 5:41 ` David Brownell
2006-06-10 11:23 ` Ulrich Kunitz
2006-06-10 11:49 ` Oliver Neukum
2006-06-10 12:40 ` [linux-usb-devel] " Daniel Drake
2006-06-10 19:37 ` Daniel Drake
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