linux-kernel - Re: Generic battery interface

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Date:	Sun, 30 Jul 2006 01:55:00 -0700
From:	Greg KH <greg@...ah.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Shem Multinymous <multinymous@...il.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	"Brown, Len" <len.brown@...el.com>, Pavel Machek <pavel@...e.cz>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	linux-thinkpad@...ux-thinkpad.org, linux-acpi@...r.kernel.org
Subject: Re: Generic battery interface

On Fri, Jul 28, 2006 at 12:10:43PM -0400, Dmitry Torokhov wrote:
> On 7/28/06, Shem Multinymous <multinymous@...il.com> wrote:
> >On 7/28/06, Dmitry Torokhov <dmitry.torokhov@...il.com> wrote:
> >> 4) sysfs - all capabilities, IDs, etc for input devices exported there 
> >as well.
> >
> >Forgive my ignorance, but how do I conncet a sysfs directory with a /dev 
> >device?
> >So far the only way I found is to compare /sys/whatever/dev with the
> >major+minor of the dev file, which requires brute-force enumeration on
> >at least one side.
> >
> 
> Can't we have udev make a symlink when it creates device node?

No, ick, why would you want that?

Just look at the "dev" file in sysfs, which shows the major:minor
number.

Or just look at the directory that you are in, and that's almost always
the /dev node name.

For example, /sys/block/sda/sda1/ is /dev/sda1.
/sys/class/tty/ttyS1 is /dev/ttyS1.

It's usually not that difficult to do the mapping :)

thanks,

greg k-h
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