linux-kernel - Re: UIO device name

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Date:	Wed, 24 Sep 2008 11:57:59 +0200
From:	Joakim Tjernlund <joakim.tjernlund@...nsmode.se>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	hjk@...utronix.de, gregkh@...e.de,
	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: UIO device name

On Wed, 2008-09-24 at 18:35 +0900, Paul Mundt wrote:
> On Wed, Sep 24, 2008 at 11:21:33AM +0200, Joakim Tjernlund wrote:
> > As far as I can see there isn't a way to name the /dev/uio%d device file
> > to something more useful, is that so?
> > I would like to name the device file from within the kernel so I can
> > find the correct device from userspace.
> > The very least is to control the minor(%d) number.
> > 
> You have a couple of options for this:
> 
> 	- the 'name' sysfs entry for each of the uio devices, which
> 	  corresponds to the uio device name.
> 	- extracting the relevant data from things like 'lsuio'.
> 	- hooking in the pretty mame through udev to create an alias.

Right, but I want to do it from within the kernel when I create the
device because that the only place I truly know what HW the uio maps to.

I found that this works:
 struct uio_info *info,
 struct uio_device *idev;

 idev = info->uio_dev;
 device_rename(idev->dev, "irq4");

but then I have to copy the private uio_device struct from uio.c
Is there a better way to get at idev->dev?

 Jocke

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