[alsa-devel] [RFC 3/5] ASoC multi-component support : core

[Liam Girdwood]

On Sun, 2010-06-27 at 21:25 +0200, Lars-Peter Clausen wrote:
> Hi
> 
> Liam Girdwood wrote:
> > This patch adds multi-component support to the ASoC core and
> > reflects the new ASoC driver/device structure model defined in soc.h
> > and soc-dai.h. i.e.
> > 
> >  struct snd_soc_codec    --->  struct snd_soc_codec (device data)
> >                           +->  struct snd_soc_codec_driver (driver data)
> > 
> >  struct snd_soc_platform --->  struct snd_soc_platform (device data)
> >                           +->  struct snd_soc_platform_driver (driver data)
> > 
> >  struct snd_soc_dai      --->  struct snd_soc_dai (device data)
> >                           +->  struct snd_soc_dai_driver (driver data)
> > 
> >  struct snd_soc_device   --->  deleted
> > 
> > Other notable multi-component changes:-
> > 
> >  * Stream operations now de-reference less structures.
> >  * close_delayed work() now runs on a DAI basis rather than looping all DAIs
> >    in a card.
> >  * PM suspend()/resume() operations can now handle N CODECs and Platforms
> >    per sound card.
> >  * Added soc_bind_dai_link() to bind the component devices to the sound card.
> >  * Added soc_dai_link_probe() and soc_dai_link_remove() to probe and remove
> >    DAI link components.
> >  * sysfs entries can now be registered per component per card.
> >  * snd_soc_new_pcms() functionailty rolled into dai_link_probe().
> >  * snd_soc_register_codec() now does all the codec list and mutex init.
> > 
> > Signed-off-by: Liam Girdwood <lrg at slimlogic.co.uk>
> > ---
> >  sound/soc/soc-core.c | 1595 +++++++++++++++++++++++++++++---------------------
> >  1 files changed, 914 insertions(+), 681 deletions(-)
> > 
> > diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
> > index 3deb226..280c2f0 100644
> > --- a/sound/soc/soc-core.c
> > +++ b/sound/soc/soc-core.c
> > [...]
> > +static int soc_probe_dai_link(struct snd_soc_card *card, int num)
> > +{
> > [...]
> > +	/* probe the CODEC */
> > +	if (!codec->probed) {
> > +		if (codec->driver->probe) {
> > +			ret = codec->driver->probe(codec);
> > +			if (ret < 0)
> > +				return ret;
> > +		}
> > +		/* Make sure all DAPM widgets are instantiated */
> > +		snd_soc_dapm_new_widgets(codec);
> > +
> > +		/* mark codec as probed and add to card codec list */
> > +		codec->probed = 1;
> > +		list_add(&codec->card_list, &card->codec_dev_list);
> > +
> > +		/* add DAPM sysfs entries for this codec */
> > +		ret = snd_soc_dapm_sys_add(codec->dev);
> >  		if (ret < 0)
> > -			goto cpu_dai_err;
> > -	}
> > -	codec = card->codec;
> > +			printk(KERN_WARNING "asoc: failed to add codec dapm sysfs entries\n");
> >  
> > -	if (platform->probe) {
> > -		ret = platform->probe(pdev);
> > +		/* add codec sysfs entries */
> > +		ret = device_create_file(codec->dev, &dev_attr_codec_reg);
> >  		if (ret < 0)
> > -			goto platform_err;
> > +			printk(KERN_WARNING "asoc: failed to add codec sysfs files\n");
> > +
> > +		soc_init_codec_debugfs(codec);
> >  	}
> >  
> > -	/* DAPM stream work */
> > -	INIT_DELAYED_WORK(&card->delayed_work, close_delayed_work);
> > -#ifdef CONFIG_PM
> > -	/* deferred resume work */
> > -	INIT_WORK(&card->deferred_resume_work, soc_resume_deferred);
> > -#endif
> > +	/* probe the platform */
> > +	if (!platform->probed) {
> > +		if (platform->driver->probe) {
> > +			ret = platform->driver->probe(platform);
> > +			if (ret < 0)
> > +				return ret;
> > +		}
> > +		/* mark platform as probed and add to card platform list */
> > +		platform->probed = 1;
> > +		list_add(&platform->card_list, &card->platform_dev_list);
> > +	}
> >  
> > -	for (i = 0; i < card->num_links; i++) {
> > -		if (card->dai_link[i].init) {
> > -			ret = card->dai_link[i].init(codec);
> > -			if (ret < 0) {
> > -				printk(KERN_ERR "asoc: failed to init %s\n",
> > -					card->dai_link[i].stream_name);
> > -				continue;
> > -			}
> > +	/* probe the CODEC DAI */
> > +	if (!codec_dai->probed) {
> > +		if (codec_dai->driver->probe) {
> > +			ret = codec_dai->driver->probe(codec_dai);
> > +			if (ret < 0)
> > +				return ret;
> >  		}
> > -		if (card->dai_link[i].codec_dai->ac97_control)
> > -			ac97 = 1;
> > +
> > +		/* mark cpu_dai as probed and add to card cpu_dai list */
> > +		codec_dai->probed = 1;
> > +		list_add(&codec_dai->card_list, &card->dai_dev_list);
> >  	}
> >  
> > -	snprintf(codec->card->shortname, sizeof(codec->card->shortname),
> > -		 "%s",  card->name);
> > -	snprintf(codec->card->longname, sizeof(codec->card->longname),
> > -		 "%s (%s)", card->name, codec->name);
> > +	/* DAPM dai link stream work */
> > +	INIT_DELAYED_WORK(&rtd->delayed_work, close_delayed_work);
> >  
> > -	/* Make sure all DAPM widgets are instantiated */
> > -	snd_soc_dapm_new_widgets(codec);
> > +	/* now that all clients have probed, initialise the DAI link */
> > +	if (dai_link->init) {
> > +		ret = dai_link->init(rtd);
> > +		if (ret < 0) {
> > +			printk(KERN_ERR "asoc: failed to init %s\n", dai_link->stream_name);
> > +			return ret;
> > +		}
> > +	}
> >  
> > [...]
> 
> Boards usually add board specific widgets and routes in their dai_link init callback.
> In the multi-component branch those widgets don't have a debugfs entry nor are they
> properly initialized. Thats because snd_soc_dapm_new_widgets used to get called after
> the dai_link init callback had been called, now it is before.
> 

Thanks, that was missing from the forward port (my dev board is
currently lagging well behind HEAD). I'll be able to bring this forward
when I'm back in the UK.

Thanks

Liam 

-- 
Freelance Developer, SlimLogic Ltd
ASoC and Voltage Regulator Maintainer.
http://www.slimlogic.co.uk