[PATCH v3] ASOC: dapm: add code to configure dai link parameters

[PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Nikesh Oswal]

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.

Signed-off-by: Nikesh Oswal <nikesh@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

[PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Nikesh Oswal]

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.

Signed-off-by: Nikesh Oswal <nikesh@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

Re: [alsa-devel] [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Vinod Koul]

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@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
> 
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

-- 

Re: [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Vinod Koul]

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@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
> 
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel@alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

-- 

Re: [alsa-devel] [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Mark Brown]

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On Thu, Aug 07, 2014 at 07:46:05PM +0530, Vinod Koul wrote:

> 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.

This is supposed to be pretty much the same thing (not looked at the
patch yet) - the machine driver passes in a list of possible settings
and then a control gets generated allowing the user to pick one.

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Re: [alsa-devel] [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Vinod Koul]

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On Thu, Aug 07, 2014 at 06:13:24PM +0100, Mark Brown wrote:
> On Thu, Aug 07, 2014 at 07:46:05PM +0530, Vinod Koul wrote:
> 
> > 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.
> 
> This is supposed to be pretty much the same thing (not looked at the
> patch yet) - the machine driver passes in a list of possible settings
> and then a control gets generated allowing the user to pick one.
Yes but this is bit different from the current way of using fixups for BEs.
So it would be bit incosistent. For pcms it would be only fixups and for
loops it would be machine controls

-- 
~Vinod

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Re: [alsa-devel] [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Mark Brown]

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On Mon, Aug 11, 2014 at 11:54:29AM +0530, Vinod Koul wrote:
> On Thu, Aug 07, 2014 at 06:13:24PM +0100, Mark Brown wrote:
> > On Thu, Aug 07, 2014 at 07:46:05PM +0530, Vinod Koul wrote:

> > > 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.

> > This is supposed to be pretty much the same thing (not looked at the
> > patch yet) - the machine driver passes in a list of possible settings
> > and then a control gets generated allowing the user to pick one.

> Yes but this is bit different from the current way of using fixups for BEs.
> So it would be bit incosistent. For pcms it would be only fixups and for
> loops it would be machine controls

That doesn't mean it's the best way to go in the end though - long term
I expect to see us move away from that to something more data driven and
DAPM integrated.  Requiring drivers to open code things rather than
factoring out the code doesn't seem like the right way forwards.

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Re: [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Mark Brown]

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On Mon, Aug 11, 2014 at 11:54:29AM +0530, Vinod Koul wrote:
> On Thu, Aug 07, 2014 at 06:13:24PM +0100, Mark Brown wrote:
> > On Thu, Aug 07, 2014 at 07:46:05PM +0530, Vinod Koul wrote:

> > > 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.

> > This is supposed to be pretty much the same thing (not looked at the
> > patch yet) - the machine driver passes in a list of possible settings
> > and then a control gets generated allowing the user to pick one.

> Yes but this is bit different from the current way of using fixups for BEs.
> So it would be bit incosistent. For pcms it would be only fixups and for
> loops it would be machine controls

That doesn't mean it's the best way to go in the end though - long term
I expect to see us move away from that to something more data driven and
DAPM integrated.  Requiring drivers to open code things rather than
factoring out the code doesn't seem like the right way forwards.

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Re: [alsa-devel] [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Vinod Koul]

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On Mon, Aug 11, 2014 at 01:19:12PM +0100, Mark Brown wrote:
> On Mon, Aug 11, 2014 at 11:54:29AM +0530, Vinod Koul wrote:
> > On Thu, Aug 07, 2014 at 06:13:24PM +0100, Mark Brown wrote:
> > > On Thu, Aug 07, 2014 at 07:46:05PM +0530, Vinod Koul wrote:
> 
> > > > 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.
> 
> > > This is supposed to be pretty much the same thing (not looked at the
> > > patch yet) - the machine driver passes in a list of possible settings
> > > and then a control gets generated allowing the user to pick one.
> 
> > Yes but this is bit different from the current way of using fixups for BEs.
> > So it would be bit incosistent. For pcms it would be only fixups and for
> > loops it would be machine controls
> 
> That doesn't mean it's the best way to go in the end though - long term
> I expect to see us move away from that to something more data driven and
> DAPM integrated.  Requiring drivers to open code things rather than
> factoring out the code doesn't seem like the right way forwards.
Okay if that is the direction then this sound good to me.

Only one last nitpick on how do we set different format value apart from
sample rate, bits etc here. We have devices talking on same port and each one is
different format(one use i2s, one uses tdm ...), so how do we handle that part?

Thanks
-- 
~Vinod

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Re: [alsa-devel] [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Mark Brown]

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On Tue, Aug 12, 2014 at 08:40:14PM +0530, Vinod Koul wrote:
> On Mon, Aug 11, 2014 at 01:19:12PM +0100, Mark Brown wrote:

> > That doesn't mean it's the best way to go in the end though - long term
> > I expect to see us move away from that to something more data driven and
> > DAPM integrated.  Requiring drivers to open code things rather than
> > factoring out the code doesn't seem like the right way forwards.

> Okay if that is the direction then this sound good to me.

> Only one last nitpick on how do we set different format value apart from
> sample rate, bits etc here. We have devices talking on same port and each one is
> different format(one use i2s, one uses tdm ...), so how do we handle that part?

Doing that sort of thing automatically is probably best handled by
having some actual concrete idea of what's on the link and how it's
sharing the resources which we don't really have in detail right now -
we loose track of TDM when things hit the link and can't do things like
notice that only two timeslots are active even though the link could
have eight and so end up powering more than we need to.  What I'd like
to be able to do is to trace the individual per-channel and per-stream
audio paths over the link, I think multiple configurations would fall
out of being able to do that though I don't have a terribly concrete
idea for a design right now (I sort of have one but it's got a lot of
handwaving in it and isn't really concrete enough to write down).

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Re: [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Mark Brown]

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On Wed, Aug 06, 2014 at 05:16:26PM +0100, Nikesh Oswal wrote:

> +/* 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);

We appear to be creating the control unconditionally so even a link
which has only one configuration will have a control created which
doesn't seem right.  Suppressing the control creation for links that
only have one configuration seems better.

Throughout this you've got coding style problems, you're not indenting
the continuations of multi-line statements.  Please try to follow the
kernel coding style, if your code is visibly different to the rest of
the codebase that's not good.

> +	for (count = 0 ; count < num_params; count++) {
> +		w_param_text[count] =  kzalloc(sizeof(char) * 100, GFP_KERNEL);

Random number!

> +		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++;

The configurations have user speciable names in them which are being
ignored here - this means that users can't specify names that are
meaningful for their systems.

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Re: [PATCH v3] ASOC: dapm: add code to configure dai link parameters

[Mark Brown]

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On Wed, Aug 06, 2014 at 05:16:26PM +0100, Nikesh Oswal wrote:

> +/* 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);

We appear to be creating the control unconditionally so even a link
which has only one configuration will have a control created which
doesn't seem right.  Suppressing the control creation for links that
only have one configuration seems better.

Throughout this you've got coding style problems, you're not indenting
the continuations of multi-line statements.  Please try to follow the
kernel coding style, if your code is visibly different to the rest of
the codebase that's not good.

> +	for (count = 0 ; count < num_params; count++) {
> +		w_param_text[count] =  kzalloc(sizeof(char) * 100, GFP_KERNEL);

Random number!

> +		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++;

The configurations have user speciable names in them which are being
ignored here - this means that users can't specify names that are
meaningful for their systems.

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