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

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Message-ID: <20070713163201.1cb6165f@the-village.bc.nu>
Date:	Fri, 13 Jul 2007 16:32:01 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jon Dufresne <jon.dufresne@...initevideocorporation.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Driver question: multiple instances of same char device

On Tue, 10 Jul 2007 09:06:36 -0400
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?

Usually one major and two minor, although sysfs and udev deals with much
of it now
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