From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: [PATCH 2/3] xen-sndfront: switch to the v2 driver
Date: Mon, 19 Jan 2015 10:57:57 +0000
Message-ID: <54BCE335.7090304@citrix.com>
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To: Oleksandr Dmytryshyn <oleksandr.dmytryshyn@globallogic.com>, xen-devel@lists.xen.org
Cc: Takashi Iwai <tiwai@suse.de>, Iurii Konovalenko <iurii.konovalenko@globallogic.com>, Jaroslav Kysela <perex@perex.cz>
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On 19/01/15 08:19, Oleksandr Dmytryshyn wrote:
> From: Iurii Konovalenko <iurii.konovalenko@globallogic.com>
> 
> Now this driver registers an virtual sound card
> and sends an PCM streams to the backend driver.
> Backend driver is an user-space application and
> uses ALSA with dmix plugin to play audio.
> 
[...]
>  struct sndif_request_open {
> -	unsigned int dev_num;
> -	unsigned int card_num;
> -	unsigned int dev_type;
> +	struct alsa_hwparams hwparams;

Don't put ALSA specific structures in the ABI.  The protocol needs to be
suitable for frontend drivers that aren't ALSA.

David