From mboxrd@z Thu Jan  1 00:00:00 1970
From: Steven Wawryk <stevenw@acres.com.au>
Subject: Adding channels on multicodec soundcard
Date: Fri, 15 Jan 2016 16:23:17 +1030
Message-ID: <5698894D.2030002@acres.com.au>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"; Format="flowed"
Content-Transfer-Encoding: 7bit
Return-path: <alsa-devel-bounces@alsa-project.org>
Received: from mail.acres.com.au (mail.acres.com.au [150.101.238.198])
 by alsa0.perex.cz (Postfix) with ESMTP id F24E826052B
 for <alsa-devel@alsa-project.org>; Fri, 15 Jan 2016 06:53:25 +0100 (CET)
Received: from localhost (localhost [127.0.0.1])
 by loki.acres.com.au (Postfix) with ESMTP id 6980EC2C9C
 for <alsa-devel@alsa-project.org>; Fri, 15 Jan 2016 16:23:24 +1030 (CST)
Received: from mail.acres.com.au ([127.0.0.1])
 by localhost (loki.acres.com.au [127.0.0.1]) (amavisd-new, port 10024)
 with ESMTP id VbT-iQeGIaBy for <alsa-devel@alsa-project.org>;
 Fri, 15 Jan 2016 16:23:18 +1030 (CST)
Received: from [192.0.2.164] (krill.acres.com.au [192.0.2.164])
 by loki.acres.com.au (Postfix) with ESMTP id D9564C2C4F
 for <alsa-devel@alsa-project.org>; Fri, 15 Jan 2016 16:23:17 +1030 (CST)
List-Unsubscribe: <http://mailman.alsa-project.org/mailman/options/alsa-devel>,
 <mailto:alsa-devel-request@alsa-project.org?subject=unsubscribe>
List-Archive: <http://mailman.alsa-project.org/pipermail/alsa-devel/>
List-Post: <mailto:alsa-devel@alsa-project.org>
List-Help: <mailto:alsa-devel-request@alsa-project.org?subject=help>
List-Subscribe: <http://mailman.alsa-project.org/mailman/listinfo/alsa-devel>,
 <mailto:alsa-devel-request@alsa-project.org?subject=subscribe>
Errors-To: alsa-devel-bounces@alsa-project.org
Sender: alsa-devel-bounces@alsa-project.org
To: alsa-devel@alsa-project.org
List-Id: alsa-devel@alsa-project.org


Hi,

I'm trying to write an ALSA soundcard driver module for an embedded 
Zynq-based system with 4 Cirrus CS42448 codecs.  Each codec has 6 analog 
output channels and I'd like the "soundcard" to have 24 channels (6 to 
each codec).  I've been having trouble getting it to do this.  The 
hw_params for the codec, card and "I2S" IP core drivers all get the same 
parameters, including number of channels.

When I define 4 snd_soc_dai_link's, each with 1 codec, then 4 "devices" 
are set up for the card and I can access 6 channels on 1 codec (1 
"device") at a time.  When I define 1 snd_soc_dai_link with 4 codecs 
then 1 "device" is set up and I can still only access 6 channels, but it 
appears to use all 4 codecs (somehow - I haven't yet worked out the 
channel allocation).  I can't seem to get 24 channels to the card, 
splitting into 6 channels to each of the codecs.

Can anyone suggest how I should be going about this?

The linux kernel is 3.17 from PetaLinux (Xilinx).

Cheers,
Steve