Could we get the card name in /sys/clas/sound/card0/name?

Could we get the card name in /sys/clas/sound/card0/name?

[Lennart Poettering]

Heya!

Hmm, it would be nifty if we could get the alsa card name (i.e. the
one shown in [] in /proc/pcm/cards) as an attribute file in
/sys/class/sound/cardX/name. Even more useful would be if this
property would be writable so that the cards may be renamed during
runtime.

This could be very useful to establish stable card names via udev
rules, similar to what is already done to network interface names
("eth0", ...).

Would such a change be acceptable?

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net         ICQ# 11060553
http://0pointer.net/lennart/           GnuPG 0x1A015CC4

Re: Could we get the card name in /sys/clas/sound/card0/name?

[Jaroslav Kysela]

On Tue, 20 Jan 2009, Lennart Poettering wrote:

> Heya!
> 
> Hmm, it would be nifty if we could get the alsa card name (i.e. the
> one shown in [] in /proc/pcm/cards) as an attribute file in
> /sys/class/sound/cardX/name. Even more useful would be if this
> property would be writable so that the cards may be renamed during
> runtime.
> 
> This could be very useful to establish stable card names via udev
> rules, similar to what is already done to network interface names
> ("eth0", ...).
> 
> Would such a change be acceptable?

It's already implemented in our recent repositories (the change will be 
in 2.6.29):

Author: Jaroslav Kysela <perex@perex.cz>
Date:   Tue Nov 11 16:51:02 2008 +0100

    ALSA: add /sys/class/sound/card#/id (r/w) and card#/number (r/o) files

    For udev, we need a way to rename soundcard names. The soundcard numbers
    (indexes) are hardwired but we have a text identification which can be
    changed at run-time. The ALSA user space tools already allow using of
    this text identification.

    Signed-off-by: Jaroslav Kysela <perex@perex.cz>
    Signed-off-by: Takashi Iwai <tiwai@suse.de>

-----
Jaroslav Kysela <perex@perex.cz>
Linux Kernel Sound Maintainer
ALSA Project, Red Hat, Inc.