linux-kernel - Re: Driver question: multiple instances of same char device

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Message-Id: <1184074303.31808.33.camel@microwave.infinitevideocorporation.com>
Date:	Tue, 10 Jul 2007 09:31:38 -0400
From:	Jon Dufresne <jon.dufresne@...initevideocorporation.com>
To:	Vitaliy Ivanov <vitalivanov@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Driver question: multiple instances of same char device

Thanks,

I have been using this book as a source, and it is a great one at that.
I thought I read the char device chapter enough times to get what I
needed out of it but apparently not. I just reread it and realized that
my answer was there.


Thanks again,
Jon

On Tue, 2007-07-10 at 16:13 +0300, Vitaliy Ivanov wrote:
> On 7/10/07, Jon Dufresne <jon.dufresne@...initevideocorporation.com> wrote:
> > I am relatively new to linux device development. And want to understand
> > Linux conventions.
> >
> > Suppose I have a PCI card that is represented in the system by a
> > character device.
> >
> > If I have two of those PCI cards in the system when the driver module
> > loads, is it convention to have two different major numbers, or have one
> > major number and two different minor numbers?
> >
> > Thanks,
> > Jon
> 
> You can start your kernel hacking way from ldd. It can be found at:
> http://lwn.net/Kernel/LDD3/
> 
> There are a few other books by R. Love or Greg KH that you can read.
> 
> Such questions are fully covered there.
> 
> Best,
> Vitaliy
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