[alsa-devel] [PATCH v3] ASOC: dapm: add code to configure dai link parameters
Vinod Koul
vinod.koul at intel.com
Thu Aug 7 16:16:05 CEST 2014
On Wed, Aug 06, 2014 at 05:16:26PM +0100, Nikesh Oswal wrote:
> dai-link params for codec-codec links were fixed. The fixed
> link between codec and another chip which may be another codec,
> baseband, bluetooth codec etc may require run time configuaration
> changes. This change provides an optional alsa control to select
> one of the params from a list of params.
Sorry haven't followed the previous versions, so excuse me if questions were
discussed already.
I was thinking about this as well a while back, wont it make sense to let
machine driver expose meaningful controls for this. Just like we have fixup
for back-ends, we can add fixups for codec-codec links and let machine tell
you the parameters to configure.
Thoughts...?
--
~Vinod
>
> Signed-off-by: Nikesh Oswal <nikesh at opensource.wolfsonmicro.com>
> ---
> include/sound/soc-dapm.h | 3 +
> include/sound/soc.h | 1 +
> sound/soc/soc-core.c | 4 +-
> sound/soc/soc-dapm.c | 140 ++++++++++++++++++++++++++++++++++++++++++++--
> 4 files changed, 141 insertions(+), 7 deletions(-)
>
> diff --git a/include/sound/soc-dapm.h b/include/sound/soc-dapm.h
> index 6b59471..3ee031e 100644
> --- a/include/sound/soc-dapm.h
> +++ b/include/sound/soc-dapm.h
> @@ -378,6 +378,7 @@ int snd_soc_dapm_link_dai_widgets(struct snd_soc_card *card);
> void snd_soc_dapm_connect_dai_link_widgets(struct snd_soc_card *card);
> int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
> const struct snd_soc_pcm_stream *params,
> + unsigned int num_params,
> struct snd_soc_dapm_widget *source,
> struct snd_soc_dapm_widget *sink);
>
> @@ -531,6 +532,8 @@ struct snd_soc_dapm_widget {
> void *priv; /* widget specific data */
> struct regulator *regulator; /* attached regulator */
> const struct snd_soc_pcm_stream *params; /* params for dai links */
> + unsigned int num_params; /* number of params for dai links */
> + unsigned int params_select; /* currently selected param for dai link */
>
> /* dapm control */
> int reg; /* negative reg = no direct dapm */
> diff --git a/include/sound/soc.h b/include/sound/soc.h
> index ed9e2d7..51c6c4f 100644
> --- a/include/sound/soc.h
> +++ b/include/sound/soc.h
> @@ -906,6 +906,7 @@ struct snd_soc_dai_link {
> int be_id; /* optional ID for machine driver BE identification */
>
> const struct snd_soc_pcm_stream *params;
> + unsigned int num_params;
>
> unsigned int dai_fmt; /* format to set on init */
>
> diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
> index b87d7d8..db1572a 100644
> --- a/sound/soc/soc-core.c
> +++ b/sound/soc/soc-core.c
> @@ -1461,7 +1461,7 @@ static int soc_link_dai_widgets(struct snd_soc_card *card,
> capture_w = cpu_dai->capture_widget;
> if (play_w && capture_w) {
> ret = snd_soc_dapm_new_pcm(card, dai_link->params,
> - capture_w, play_w);
> + dai_link->num_params, capture_w, play_w);
> if (ret != 0) {
> dev_err(card->dev, "ASoC: Can't link %s to %s: %d\n",
> play_w->name, capture_w->name, ret);
> @@ -1473,7 +1473,7 @@ static int soc_link_dai_widgets(struct snd_soc_card *card,
> capture_w = codec_dai->capture_widget;
> if (play_w && capture_w) {
> ret = snd_soc_dapm_new_pcm(card, dai_link->params,
> - capture_w, play_w);
> + dai_link->num_params, capture_w, play_w);
> if (ret != 0) {
> dev_err(card->dev, "ASoC: Can't link %s to %s: %d\n",
> play_w->name, capture_w->name, ret);
> diff --git a/sound/soc/soc-dapm.c b/sound/soc/soc-dapm.c
> index cdc837e..41f835b 100644
> --- a/sound/soc/soc-dapm.c
> +++ b/sound/soc/soc-dapm.c
> @@ -729,6 +729,33 @@ static int dapm_new_pga(struct snd_soc_dapm_widget *w)
> return 0;
> }
>
> +/* create new dapm dai link control */
> +static int dapm_new_dai_link(struct snd_soc_dapm_widget *w)
> +{
> + int i, ret;
> + struct snd_kcontrol *kcontrol;
> + struct snd_soc_dapm_context *dapm = w->dapm;
> + struct snd_card *card = dapm->card->snd_card;
> +
> +
> + /* add kcontrol */
> + for (i = 0; i < w->num_kcontrols; i++) {
> + kcontrol = snd_soc_cnew(&w->kcontrol_news[i], w,
> + w->name, NULL);
> + ret = snd_ctl_add(card, kcontrol);
> + if (ret < 0) {
> + dev_err(dapm->dev,
> + "ASoC: failed to add widget %s dapm kcontrol %s: %d\n",
> + w->name, w->kcontrol_news[i].name, ret);
> + return ret;
> + }
> + kcontrol->private_data = w;
> + w->kcontrols[i] = kcontrol;
> + }
> +
> + return 0;
> +}
> +
> /* reset 'walked' bit for each dapm path */
> static void dapm_clear_walk_output(struct snd_soc_dapm_context *dapm,
> struct list_head *sink)
> @@ -2664,6 +2691,9 @@ int snd_soc_dapm_new_widgets(struct snd_soc_card *card)
> case snd_soc_dapm_out_drv:
> dapm_new_pga(w);
> break;
> + case snd_soc_dapm_dai_link:
> + dapm_new_dai_link(w);
> + break;
> default:
> break;
> }
> @@ -3142,6 +3172,9 @@ static int snd_soc_dai_link_event(struct snd_soc_dapm_widget *w,
> source = source_p->source->priv;
> sink = sink_p->sink->priv;
>
> + /* Select the configuration set by alsa control */
> + config += w->params_select;
> +
> /* Be a little careful as we don't want to overflow the mask array */
> if (config->formats) {
> fmt = ffs(config->formats) - 1;
> @@ -3222,8 +3255,35 @@ out:
> return ret;
> }
>
> +static int snd_soc_dapm_dai_link_get(struct snd_kcontrol *kcontrol,
> + struct snd_ctl_elem_value *ucontrol)
> +{
> + struct snd_soc_dapm_widget *w = snd_kcontrol_chip(kcontrol);
> +
> + ucontrol->value.integer.value[0] = w->params_select;
> +
> + return 0;
> +}
> +
> +static int snd_soc_dapm_dai_link_put(struct snd_kcontrol *kcontrol,
> + struct snd_ctl_elem_value *ucontrol)
> +{
> + struct snd_soc_dapm_widget *w = snd_kcontrol_chip(kcontrol);
> +
> + if (ucontrol->value.integer.value[0] == w->params_select)
> + return 0;
> +
> + if (ucontrol->value.integer.value[0] >= w->num_params)
> + return -EINVAL;
> +
> + w->params_select = ucontrol->value.integer.value[0];
> +
> + return 0;
> +}
> +
> int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
> const struct snd_soc_pcm_stream *params,
> + unsigned int num_params,
> struct snd_soc_dapm_widget *source,
> struct snd_soc_dapm_widget *sink)
> {
> @@ -3231,12 +3291,44 @@ int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
> struct snd_soc_dapm_widget *w;
> size_t len;
> char *link_name;
> - int ret;
> + int ret, count;
> + unsigned long private_value;
> + char **w_param_text;
> + struct soc_enum w_param_enum[] = {
> + SOC_ENUM_SINGLE(0, 0, 0, NULL),
> + };
> + struct snd_kcontrol_new kcontrol_dai_link[] = {
> + SOC_ENUM_EXT(NULL, w_param_enum[0],
> + snd_soc_dapm_dai_link_get, snd_soc_dapm_dai_link_put),
> + };
> + const struct snd_soc_pcm_stream *config = params;
> +
> + w_param_text = kzalloc(sizeof(char *) * num_params, GFP_KERNEL);
> + if (!w_param_text)
> + return -ENOMEM;
> +
> + for (count = 0 ; count < num_params; count++) {
> + w_param_text[count] = kzalloc(sizeof(char) * 100, GFP_KERNEL);
> + if (!w_param_text) {
> + ret = -ENOMEM;
> + goto outfree_w_param;
> + }
> +
> + sprintf(w_param_text[count], "SampleRate=%d:Channels=%d:BitsPerSample=%d",
> + config->rate_min, config->channels_min,
> + snd_pcm_format_width(ffs(config->formats) - 1));
> + config++;
> + }
> + w_param_enum[0].items = num_params;
> + w_param_enum[0].texts = (const char * const *) w_param_text;
>
> len = strlen(source->name) + strlen(sink->name) + 2;
> link_name = devm_kzalloc(card->dev, len, GFP_KERNEL);
> - if (!link_name)
> - return -ENOMEM;
> + if (!link_name) {
> + ret = -ENOMEM;
> + goto outfree_w_param;
> + }
> +
> snprintf(link_name, len, "%s-%s", source->name, sink->name);
>
> memset(&template, 0, sizeof(template));
> @@ -3246,6 +3338,25 @@ int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
> template.event = snd_soc_dai_link_event;
> template.event_flags = SND_SOC_DAPM_PRE_PMU | SND_SOC_DAPM_POST_PMU |
> SND_SOC_DAPM_PRE_PMD;
> + template.num_kcontrols = 1;
> + private_value =
> + (unsigned long) kmemdup((void *)(kcontrol_dai_link[0].private_value),
> + sizeof(struct soc_enum), GFP_KERNEL);
> + if (!private_value) {
> + dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
> + link_name);
> + ret = -ENOMEM;
> + goto outfree_link_name;
> + }
> + kcontrol_dai_link[0].private_value = private_value;
> + template.kcontrol_news = kmemdup(&kcontrol_dai_link[0],
> + sizeof(struct snd_kcontrol_new), GFP_KERNEL);
> + if (!template.kcontrol_news) {
> + dev_err(card->dev, "ASoC: Failed to create control for %s widget\n",
> + link_name);
> + ret = -ENOMEM;
> + goto outfree_private_value;
> + }
>
> dev_dbg(card->dev, "ASoC: adding %s widget\n", link_name);
>
> @@ -3253,15 +3364,34 @@ int snd_soc_dapm_new_pcm(struct snd_soc_card *card,
> if (!w) {
> dev_err(card->dev, "ASoC: Failed to create %s widget\n",
> link_name);
> - return -ENOMEM;
> + ret = -ENOMEM;
> + goto outfree_kcontrol_news;
> }
>
> w->params = params;
> + w->num_params = num_params;
>
> ret = snd_soc_dapm_add_path(&card->dapm, source, w, NULL, NULL);
> if (ret)
> - return ret;
> + goto outfree_w;
> return snd_soc_dapm_add_path(&card->dapm, w, sink, NULL, NULL);
> +
> +outfree_w:
> + kfree(w);
> +outfree_kcontrol_news:
> + kfree(template.kcontrol_news);
> +outfree_private_value:
> + kfree((void *)private_value);
> +outfree_link_name:
> + kfree(link_name);
> +outfree_w_param:
> + for (count = 0 ; count < num_params; count++) {
> + if (w_param_text[count])
> + kfree(w_param_text[count]);
> + }
> + kfree(w_param_text);
> +
> + return ret;
> }
>
> int snd_soc_dapm_new_dai_widgets(struct snd_soc_dapm_context *dapm,
> --
> 1.7.9.5
>
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