ASoC: core: Add initial support for DAI multicodec

DAI link assumes a one to one mapping between CPU DAI and CODEC. In
some cases, the same CPU DAI can be connected to several codecs.
This is the case for example, if you connect two mono codecs to the
same I2S link in order to have a stereo card.
The current ASoC implementation does not allow such setup.

Add support for DAI links composed of a single CPU DAI and multiple
CODECs. Sound cards have to pass the CODECs array in the corresponding
DAI link through a new 'snd_soc_dai_link_component' struct. Each CODEC in
this array is described in the same manner single CODEC DAIs are
(either DT/OF node or codec_name).

Multi-codec links are not supported in the case of CODEC to CODEC links.
Just print a warning if it happens.

Based on an original code done by Misael.

Signed-off-by: Benoit Cousson <bcousson@baylibre.com>
Signed-off-by: Misael Lopez Cruz <misael.lopez@ti.com>
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Tested-by: Lars-Peter Clausen <lars@metafoo.de>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 203 insertions, 90 deletions

diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index c32d8399e770..6e47610f73a0 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -576,7 +576,7 @@ int snd_soc_suspend(struct device *dev)
 {
 	struct snd_soc_card *card = dev_get_drvdata(dev);
 	struct snd_soc_codec *codec;
-	int i;
+	int i, j;
 
 	/* If the initialization of this soc device failed, there is no codec
 	 * associated with it. Just bail out in this case.
@@ -596,14 +596,17 @@ int snd_soc_suspend(struct device *dev)
 
 	/* mute any active DACs */
 	for (i = 0; i < card->num_rtd; i++) {
-		struct snd_soc_dai *dai = card->rtd[i].codec_dai;
-		struct snd_soc_dai_driver *drv = dai->driver;
 
 		if (card->rtd[i].dai_link->ignore_suspend)
 			continue;
 
-		if (drv->ops->digital_mute && dai->playback_active)
-			drv->ops->digital_mute(dai, 1);
+		for (j = 0; j < card->rtd[i].num_codecs; j++) {
+			struct snd_soc_dai *dai = card->rtd[i].codec_dais[j];
+			struct snd_soc_dai_driver *drv = dai->driver;
+
+			if (drv->ops->digital_mute && dai->playback_active)
+				drv->ops->digital_mute(dai, 1);
+		}
 	}
 
 	/* suspend all pcms */
@@ -634,8 +637,12 @@ int snd_soc_suspend(struct device *dev)
 
 	/* close any waiting streams and save state */
 	for (i = 0; i < card->num_rtd; i++) {
+		struct snd_soc_dai **codec_dais = card->rtd[i].codec_dais;
 		flush_delayed_work(&card->rtd[i].delayed_work);
-		card->rtd[i].codec->dapm.suspend_bias_level = card->rtd[i].codec->dapm.bias_level;
+		for (j = 0; j < card->rtd[i].num_codecs; j++) {
+			codec_dais[j]->codec->dapm.suspend_bias_level =
+					codec_dais[j]->codec->dapm.bias_level;
+		}
 	}
 
 	for (i = 0; i < card->num_rtd; i++) {
@@ -719,7 +726,7 @@ static void soc_resume_deferred(struct work_struct *work)
 	struct snd_soc_card *card =
 			container_of(work, struct snd_soc_card, deferred_resume_work);
 	struct snd_soc_codec *codec;
-	int i;
+	int i, j;
 
 	/* our power state is still SNDRV_CTL_POWER_D3hot from suspend time,
 	 * so userspace apps are blocked from touching us
@@ -780,14 +787,17 @@ static void soc_resume_deferred(struct work_struct *work)
 
 	/* unmute any active DACs */
 	for (i = 0; i < card->num_rtd; i++) {
-		struct snd_soc_dai *dai = card->rtd[i].codec_dai;
-		struct snd_soc_dai_driver *drv = dai->driver;
 
 		if (card->rtd[i].dai_link->ignore_suspend)
 			continue;
 
-		if (drv->ops->digital_mute && dai->playback_active)
-			drv->ops->digital_mute(dai, 0);
+		for (j = 0; j < card->rtd[i].num_codecs; j++) {
+			struct snd_soc_dai *dai = card->rtd[i].codec_dais[j];
+			struct snd_soc_dai_driver *drv = dai->driver;
+
+			if (drv->ops->digital_mute && dai->playback_active)
+				drv->ops->digital_mute(dai, 0);
+		}
 	}
 
 	for (i = 0; i < card->num_rtd; i++) {
@@ -832,12 +842,19 @@ int snd_soc_resume(struct device *dev)
 
 	/* activate pins from sleep state */
 	for (i = 0; i < card->num_rtd; i++) {
-		struct snd_soc_dai *cpu_dai = card->rtd[i].cpu_dai;
-		struct snd_soc_dai *codec_dai = card->rtd[i].codec_dai;
+		struct snd_soc_pcm_runtime *rtd = &card->rtd[i];
+		struct snd_soc_dai **codec_dais = rtd->codec_dais;
+		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+		int j;
+
 		if (cpu_dai->active)
 			pinctrl_pm_select_default_state(cpu_dai->dev);
-		if (codec_dai->active)
-			pinctrl_pm_select_default_state(codec_dai->dev);
+
+		for (j = 0; j < rtd->num_codecs; j++) {
+			struct snd_soc_dai *codec_dai = codec_dais[j];
+			if (codec_dai->active)
+				pinctrl_pm_select_default_state(codec_dai->dev);
+		}
 	}
 
 	/* AC97 devices might have other drivers hanging off them so
@@ -869,8 +886,9 @@ EXPORT_SYMBOL_GPL(snd_soc_resume);
 static const struct snd_soc_dai_ops null_dai_ops = {
 };
 
-static struct snd_soc_codec *soc_find_codec(const struct device_node *codec_of_node,
-					    const char *codec_name)
+static struct snd_soc_codec *soc_find_codec(
+					const struct device_node *codec_of_node,
+					const char *codec_name)
 {
 	struct snd_soc_codec *codec;
 
@@ -908,9 +926,12 @@ static int soc_bind_dai_link(struct snd_soc_card *card, int num)
 	struct snd_soc_dai_link *dai_link = &card->dai_link[num];
 	struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
 	struct snd_soc_component *component;
+	struct snd_soc_dai_link_component *codecs = dai_link->codecs;
+	struct snd_soc_dai **codec_dais = rtd->codec_dais;
 	struct snd_soc_platform *platform;
 	struct snd_soc_dai *cpu_dai;
 	const char *platform_name;
+	int i;
 
 	dev_dbg(card->dev, "ASoC: binding %s at idx %d\n", dai_link->name, num);
 
@@ -937,24 +958,30 @@ static int soc_bind_dai_link(struct snd_soc_card *card, int num)
 		return -EPROBE_DEFER;
 	}
 
-	/* Find CODEC from registered list */
-	rtd->codec = soc_find_codec(dai_link->codec_of_node,
-				    dai_link->codec_name);
-	if (!rtd->codec) {
-		dev_err(card->dev, "ASoC: CODEC %s not registered\n",
-			dai_link->codec_name);
-		return -EPROBE_DEFER;
-	}
+	rtd->num_codecs = dai_link->num_codecs;
 
-	/* Find CODEC DAI from registered list */
-	rtd->codec_dai = soc_find_codec_dai(rtd->codec,
-					    dai_link->codec_dai_name);
-	if (!rtd->codec_dai) {
-		dev_err(card->dev, "ASoC: CODEC DAI %s not registered\n",
-			dai_link->codec_dai_name);
-		return -EPROBE_DEFER;
+	/* Find CODEC from registered CODECs */
+	for (i = 0; i < rtd->num_codecs; i++) {
+		struct snd_soc_codec *codec;
+		codec = soc_find_codec(codecs[i].of_node, codecs[i].name);
+		if (!codec) {
+			dev_err(card->dev, "ASoC: CODEC %s not registered\n",
+				codecs[i].name);
+			return -EPROBE_DEFER;
+		}
+
+		codec_dais[i] = soc_find_codec_dai(codec, codecs[i].dai_name);
+		if (!codec_dais[i]) {
+			dev_err(card->dev, "ASoC: CODEC DAI %s not registered\n",
+				codecs[i].dai_name);
+			return -EPROBE_DEFER;
+		}
 	}
 
+	/* Single codec links expect codec and codec_dai in runtime data */
+	rtd->codec_dai = codec_dais[0];
+	rtd->codec = rtd->codec_dai->codec;
+
 	/* if there's no platform we match on the empty platform */
 	platform_name = dai_link->platform_name;
 	if (!platform_name && !dai_link->platform_of_node)
@@ -1045,8 +1072,8 @@ static void soc_remove_codec_dai(struct snd_soc_dai *codec_dai, int order)
 static void soc_remove_link_dais(struct snd_soc_card *card, int num, int order)
 {
 	struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
-	struct snd_soc_dai *codec_dai = rtd->codec_dai, *cpu_dai = rtd->cpu_dai;
-	int err;
+	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+	int i, err;
 
 	/* unregister the rtd device */
 	if (rtd->dev_registered) {
@@ -1057,7 +1084,8 @@ static void soc_remove_link_dais(struct snd_soc_card *card, int num, int order)
 	}
 
 	/* remove the CODEC DAI */
-	soc_remove_codec_dai(codec_dai, order);
+	for (i = 0; i < rtd->num_codecs; i++)
+		soc_remove_codec_dai(rtd->codec_dais[i], order);
 
 	/* remove the cpu_dai */
 	if (cpu_dai && cpu_dai->probed &&
@@ -1080,9 +1108,9 @@ static void soc_remove_link_components(struct snd_soc_card *card, int num,
 {
 	struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
-	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_platform *platform = rtd->platform;
 	struct snd_soc_codec *codec;
+	int i;
 
 	/* remove the platform */
 	if (platform && platform->probed &&
@@ -1091,8 +1119,8 @@ static void soc_remove_link_components(struct snd_soc_card *card, int num,
 	}
 
 	/* remove the CODEC-side CODEC */
-	if (codec_dai) {
-		codec = codec_dai->codec;
+	for (i = 0; i < rtd->num_codecs; i++) {
+		codec = rtd->codec_dais[i]->codec;
 		if (codec && codec->probed &&
 		    codec->driver->remove_order == order)
 			soc_remove_codec(codec);
@@ -1335,9 +1363,8 @@ static int soc_probe_link_components(struct snd_soc_card *card, int num,
 {
 	struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
-	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_platform *platform = rtd->platform;
-	int ret;
+	int i, ret;
 
 	/* probe the CPU-side component, if it is a CODEC */
 	if (cpu_dai->codec &&
@@ -1348,12 +1375,14 @@ static int soc_probe_link_components(struct snd_soc_card *card, int num,
 			return ret;
 	}
 
-	/* probe the CODEC-side component */
-	if (!codec_dai->codec->probed &&
-	    codec_dai->codec->driver->probe_order == order) {
-		ret = soc_probe_codec(card, codec_dai->codec);
-		if (ret < 0)
-			return ret;
+	/* probe the CODEC-side components */
+	for (i = 0; i < rtd->num_codecs; i++) {
+		if (!rtd->codec_dais[i]->codec->probed &&
+		    rtd->codec_dais[i]->codec->driver->probe_order == order) {
+			ret = soc_probe_codec(card, rtd->codec_dais[i]->codec);
+			if (ret < 0)
+				return ret;
+		}
 	}
 
 	/* probe the platform */
@@ -1400,6 +1429,9 @@ static int soc_link_dai_widgets(struct snd_soc_card *card,
 	struct snd_soc_dapm_widget *play_w, *capture_w;
 	int ret;
 
+	if (rtd->num_codecs > 1)
+		dev_warn(card->dev, "ASoC: Multiple codecs not supported yet\n");
+
 	/* link the DAI widgets */
 	play_w = codec_dai->playback_widget;
 	capture_w = cpu_dai->capture_widget;
@@ -1432,19 +1464,18 @@ static int soc_probe_link_dais(struct snd_soc_card *card, int num, int order)
 {
 	struct snd_soc_dai_link *dai_link = &card->dai_link[num];
 	struct snd_soc_pcm_runtime *rtd = &card->rtd[num];
-	struct snd_soc_codec *codec = rtd->codec;
 	struct snd_soc_platform *platform = rtd->platform;
-	struct snd_soc_dai *codec_dai = rtd->codec_dai;
 	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
-	int ret;
+	int i, ret;
 
 	dev_dbg(card->dev, "ASoC: probe %s dai link %d late %d\n",
 			card->name, num, order);
 
 	/* config components */
 	cpu_dai->platform = platform;
-	codec_dai->card = card;
 	cpu_dai->card = card;
+	for (i = 0; i < rtd->num_codecs; i++)
+		rtd->codec_dais[i]->card = card;
 
 	/* set default power off timeout */
 	rtd->pmdown_time = pmdown_time;
@@ -1471,9 +1502,11 @@ static int soc_probe_link_dais(struct snd_soc_card *card, int num, int order)
 	}
 
 	/* probe the CODEC DAI */
-	ret = soc_probe_codec_dai(card, codec_dai, order);
-	if (ret)
-		return ret;
+	for (i = 0; i < rtd->num_codecs; i++) {
+		ret = soc_probe_codec_dai(card, rtd->codec_dais[i], order);
+		if (ret)
+			return ret;
+	}
 
 	/* complete DAI probe during last probe */
 	if (order != SND_SOC_COMP_ORDER_LAST)
@@ -1541,8 +1574,11 @@ static int soc_probe_link_dais(struct snd_soc_card *card, int num, int order)
 	}
 
 	/* add platform data for AC97 devices */
-	if (rtd->codec_dai->driver->ac97_control)
-		snd_ac97_dev_add_pdata(codec->ac97, rtd->cpu_dai->ac97_pdata);
+	for (i = 0; i < rtd->num_codecs; i++) {
+		if (rtd->codec_dais[i]->driver->ac97_control)
+			snd_ac97_dev_add_pdata(rtd->codec_dais[i]->codec->ac97,
+					       rtd->cpu_dai->ac97_pdata);
+	}
 
 	return 0;
 }
@@ -1580,11 +1616,6 @@ static int soc_register_ac97_codec(struct snd_soc_codec *codec,
 	return 0;
 }
 
-static int soc_register_ac97_dai_link(struct snd_soc_pcm_runtime *rtd)
-{
-	return soc_register_ac97_codec(rtd->codec, rtd->codec_dai);
-}
-
 static void soc_unregister_ac97_codec(struct snd_soc_codec *codec)
 {
 	if (codec->ac97_registered) {
@@ -1593,9 +1624,30 @@ static void soc_unregister_ac97_codec(struct snd_soc_codec *codec)
 	}
 }
 
+static int soc_register_ac97_dai_link(struct snd_soc_pcm_runtime *rtd)
+{
+	int i, ret;
+
+	for (i = 0; i < rtd->num_codecs; i++) {
+		struct snd_soc_dai *codec_dai = rtd->codec_dais[i];
+
+		ret = soc_register_ac97_codec(codec_dai->codec, codec_dai);
+		if (ret) {
+			while (--i >= 0)
+				soc_unregister_ac97_codec(codec_dai->codec);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
 static void soc_unregister_ac97_dai_link(struct snd_soc_pcm_runtime *rtd)
 {
-	soc_unregister_ac97_codec(rtd->codec);
+	int i;
+
+	for (i = 0; i < rtd->num_codecs; i++)
+		soc_unregister_ac97_codec(rtd->codec_dais[i]->codec);
 }
 #endif
 
@@ -1794,16 +1846,23 @@ static int snd_soc_instantiate_card(struct snd_soc_card *card)
 					card->num_dapm_routes);
 
 	for (i = 0; i < card->num_links; i++) {
+		struct snd_soc_pcm_runtime *rtd = &card->rtd[i];
 		dai_link = &card->dai_link[i];
 		dai_fmt = dai_link->dai_fmt;
 
 		if (dai_fmt) {
-			ret = snd_soc_dai_set_fmt(card->rtd[i].codec_dai,
-						  dai_fmt);
-			if (ret != 0 && ret != -ENOTSUPP)
-				dev_warn(card->rtd[i].codec_dai->dev,
-					 "ASoC: Failed to set DAI format: %d\n",
-					 ret);
+			struct snd_soc_dai **codec_dais = rtd->codec_dais;
+			int j;
+
+			for (j = 0; j < rtd->num_codecs; j++) {
+				struct snd_soc_dai *codec_dai = codec_dais[j];
+
+				ret = snd_soc_dai_set_fmt(codec_dai, dai_fmt);
+				if (ret != 0 && ret != -ENOTSUPP)
+					dev_warn(codec_dai->dev,
+						 "ASoC: Failed to set DAI format: %d\n",
+						 ret);
+			}
 		}
 
 		/* If this is a regular CPU link there will be a platform */
@@ -2002,10 +2061,15 @@ int snd_soc_poweroff(struct device *dev)
 
 	/* deactivate pins to sleep state */
 	for (i = 0; i < card->num_rtd; i++) {
-		struct snd_soc_dai *cpu_dai = card->rtd[i].cpu_dai;
-		struct snd_soc_dai *codec_dai = card->rtd[i].codec_dai;
-		pinctrl_pm_select_sleep_state(codec_dai->dev);
+		struct snd_soc_pcm_runtime *rtd = &card->rtd[i];
+		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+		int j;
+
 		pinctrl_pm_select_sleep_state(cpu_dai->dev);
+		for (j = 0; j < rtd->num_codecs; j++) {
+			struct snd_soc_dai *codec_dai = rtd->codec_dais[j];
+			pinctrl_pm_select_sleep_state(codec_dai->dev);
+		}
 	}
 
 	return 0;
@@ -3585,6 +3649,9 @@ int snd_soc_dai_set_tdm_slot(struct snd_soc_dai *dai,
 	else
 		snd_soc_xlate_tdm_slot_mask(slots, &tx_mask, &rx_mask);
 
+	dai->tx_mask = tx_mask;
+	dai->rx_mask = rx_mask;
+
 	if (dai->driver && dai->driver->ops->set_tdm_slot)
 		return dai->driver->ops->set_tdm_slot(dai, tx_mask, rx_mask,
 				slots, slot_width);
@@ -3657,6 +3724,33 @@ int snd_soc_dai_digital_mute(struct snd_soc_dai *dai, int mute,
 }
 EXPORT_SYMBOL_GPL(snd_soc_dai_digital_mute);
 
+static int snd_soc_init_multicodec(struct snd_soc_card *card,
+				   struct snd_soc_dai_link *dai_link)
+{
+	/* Legacy codec/codec_dai link is a single entry in multicodec */
+	if (dai_link->codec_name || dai_link->codec_of_node ||
+	    dai_link->codec_dai_name) {
+		dai_link->num_codecs = 1;
+
+		dai_link->codecs = devm_kzalloc(card->dev,
+				sizeof(struct snd_soc_dai_link_component),
+				GFP_KERNEL);
+		if (!dai_link->codecs)
+			return -ENOMEM;
+
+		dai_link->codecs[0].name = dai_link->codec_name;
+		dai_link->codecs[0].of_node = dai_link->codec_of_node;
+		dai_link->codecs[0].dai_name = dai_link->codec_dai_name;
+	}
+
+	if (!dai_link->codecs) {
+		dev_err(card->dev, "ASoC: DAI link has no CODECs\n");
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 /**
  * snd_soc_register_card - Register a card with the ASoC core
  *
@@ -3665,7 +3759,7 @@ EXPORT_SYMBOL_GPL(snd_soc_dai_digital_mute);
  */
 int snd_soc_register_card(struct snd_soc_card *card)
 {
-	int i, ret;
+	int i, j, ret;
 
 	if (!card->name || !card->dev)
 		return -EINVAL;
@@ -3673,22 +3767,29 @@ int snd_soc_register_card(struct snd_soc_card *card)
 	for (i = 0; i < card->num_links; i++) {
 		struct snd_soc_dai_link *link = &card->dai_link[i];
 
-		/*
-		 * Codec must be specified by 1 of name or OF node,
-		 * not both or neither.
-		 */
-		if (!!link->codec_name == !!link->codec_of_node) {
-			dev_err(card->dev,
-				"ASoC: Neither/both codec name/of_node are set for %s\n",
-				link->name);
-			return -EINVAL;
+		ret = snd_soc_init_multicodec(card, link);
+		if (ret) {
+			dev_err(card->dev, "ASoC: failed to init multicodec\n");
+			return ret;
 		}
-		/* Codec DAI name must be specified */
-		if (!link->codec_dai_name) {
-			dev_err(card->dev,
-				"ASoC: codec_dai_name not set for %s\n",
-				link->name);
-			return -EINVAL;
+
+		for (j = 0; j < link->num_codecs; j++) {
+			/*
+			 * Codec must be specified by 1 of name or OF node,
+			 * not both or neither.
+			 */
+			if (!!link->codecs[j].name ==
+			    !!link->codecs[j].of_node) {
+				dev_err(card->dev, "ASoC: Neither/both codec name/of_node are set for %s\n",
+					link->name);
+				return -EINVAL;
+			}
+			/* Codec DAI name must be specified */
+			if (!link->codecs[j].dai_name) {
+				dev_err(card->dev, "ASoC: codec_dai_name not set for %s\n",
+					link->name);
+				return -EINVAL;
+			}
 		}
 
 		/*
@@ -3744,6 +3845,12 @@ int snd_soc_register_card(struct snd_soc_card *card)
 	for (i = 0; i < card->num_links; i++) {
 		card->rtd[i].card = card;
 		card->rtd[i].dai_link = &card->dai_link[i];
+		card->rtd[i].codec_dais = devm_kzalloc(card->dev,
+					sizeof(struct snd_soc_dai *) *
+					(card->rtd[i].dai_link->num_codecs),
+					GFP_KERNEL);
+		if (card->rtd[i].codec_dais == NULL)
+			return -ENOMEM;
 	}
 
 	for (i = 0; i < card->num_aux_devs; i++)
@@ -3760,10 +3867,16 @@ int snd_soc_register_card(struct snd_soc_card *card)
 
 	/* deactivate pins to sleep state */
 	for (i = 0; i < card->num_rtd; i++) {
-		struct snd_soc_dai *cpu_dai = card->rtd[i].cpu_dai;
-		struct snd_soc_dai *codec_dai = card->rtd[i].codec_dai;
-		if (!codec_dai->active)
-			pinctrl_pm_select_sleep_state(codec_dai->dev);
+		struct snd_soc_pcm_runtime *rtd = &card->rtd[i];
+		struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
+		int j;
+
+		for (j = 0; j < rtd->num_codecs; j++) {
+			struct snd_soc_dai *codec_dai = rtd->codec_dais[j];
+			if (!codec_dai->active)
+				pinctrl_pm_select_sleep_state(codec_dai->dev);
+		}
+
 		if (!cpu_dai->active)
 			pinctrl_pm_select_sleep_state(cpu_dai->dev);
 	}