ASoC: audio-graph: Expose helpers from audio graph

This commit exposes following functions which can be used by a sound
card driver based on generic audio graph driver. Idea is vendors can
have a thin driver and re-use common stuff from audio graph driver.

 - graph_card_probe()
 - graph_parse_of()

In doing so a new header file is added for above. The graph_probe()
function is simplified by moving more common stuff to graph_parse_of().

Signed-off-by: Sameer Pujar <spujar@nvidia.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://lore.kernel.org/r/1604329814-24779-8-git-send-email-spujar@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/graph_card.h

@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * ASoC audio graph card support
+ *
+ */
+
+#ifndef __GRAPH_CARD_H
+#define __GRAPH_CARD_H
+
+#include <sound/simple_card_utils.h>
+
+int graph_card_probe(struct snd_soc_card *card);
+
+int graph_parse_of(struct asoc_simple_priv *priv, struct device *dev);
+
+#endif /* __GRAPH_CARD_H */

sound/soc/generic/audio-graph-card.c

@@ -18,7 +18,7 @@
 #include <linux/of_graph.h>
 #include <linux/platform_device.h>
 #include <linux/string.h>
-#include <sound/simple_card_utils.h>
+#include <sound/graph_card.h>
 
 #define DPCM_SELECTABLE 1
 
@@ -529,12 +529,34 @@ static int graph_for_each_link(struct asoc_simple_priv *priv,
 	return 0;
 }
 
-static int graph_parse_of(struct asoc_simple_priv *priv)
+static void graph_get_dais_count(struct asoc_simple_priv *priv,
+				 struct link_info *li);
+
+int graph_parse_of(struct asoc_simple_priv *priv, struct device *dev)
 {
 	struct snd_soc_card *card = simple_priv_to_card(priv);
 	struct link_info li;
 	int ret;
 
+	card->owner = THIS_MODULE;
+	card->dev = dev;
+
+	memset(&li, 0, sizeof(li));
+	graph_get_dais_count(priv, &li);
+	if (!li.link || !li.dais)
+		return -EINVAL;
+
+	ret = asoc_simple_init_priv(priv, &li);
+	if (ret < 0)
+		return ret;
+
+	priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
+	if (IS_ERR(priv->pa_gpio)) {
+		ret = PTR_ERR(priv->pa_gpio);
+		dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
+		return ret;
+	}
+
 	ret = asoc_simple_parse_widgets(card, NULL);
 	if (ret < 0)
 		return ret;
@@ -561,11 +583,32 @@ static int graph_parse_of(struct asoc_simple_priv *priv)
 					  graph_dai_link_of,
 					  graph_dai_link_of_dpcm);
 		if (ret < 0)
-			return ret;
+			goto err;
 	}
 
-	return asoc_simple_parse_card_name(card, NULL);
+	ret = asoc_simple_parse_card_name(card, NULL);
+	if (ret < 0)
+		goto err;
+
+	snd_soc_card_set_drvdata(card, priv);
+
+	asoc_simple_debug_info(priv);
+
+	ret = devm_snd_soc_register_card(dev, card);
+	if (ret < 0)
+		goto err;
+
+	return 0;
+
+err:
+	asoc_simple_clean_reference(card);
+
+	if (ret != -EPROBE_DEFER)
+		dev_err(dev, "parse error %d\n", ret);
+
+	return ret;
 }
+EXPORT_SYMBOL_GPL(graph_parse_of);
 
 static int graph_count_noml(struct asoc_simple_priv *priv,
 			    struct device_node *cpu_ep,
@@ -662,7 +705,7 @@ static void graph_get_dais_count(struct asoc_simple_priv *priv,
 		li->link, li->dais, li->conf);
 }
 
-static int graph_card_probe(struct snd_soc_card *card)
+int graph_card_probe(struct snd_soc_card *card)
 {
 	struct asoc_simple_priv *priv = snd_soc_card_get_drvdata(card);
 	int ret;
@@ -677,14 +720,13 @@ static int graph_card_probe(struct snd_soc_card *card)
 
 	return 0;
 }
+EXPORT_SYMBOL_GPL(graph_card_probe);
 
 static int graph_probe(struct platform_device *pdev)
 {
 	struct asoc_simple_priv *priv;
 	struct device *dev = &pdev->dev;
 	struct snd_soc_card *card;
-	struct link_info li;
-	int ret;
 
 	/* Allocate the private data and the DAI link array */
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
@@ -692,8 +734,6 @@ static int graph_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	card = simple_priv_to_card(priv);
-	card->owner		= THIS_MODULE;
-	card->dev		= dev;
 	card->dapm_widgets	= graph_dapm_widgets;
 	card->num_dapm_widgets	= ARRAY_SIZE(graph_dapm_widgets);
 	card->probe		= graph_card_probe;
@@ -701,42 +741,7 @@ static int graph_probe(struct platform_device *pdev)
 	if (of_device_get_match_data(dev))
 		priv->dpcm_selectable = 1;
 
-	memset(&li, 0, sizeof(li));
+	return graph_parse_of(priv, dev);
-	graph_get_dais_count(priv, &li);
-	if (!li.link || !li.dais)
-		return -EINVAL;
-
-	ret = asoc_simple_init_priv(priv, &li);
-	if (ret < 0)
-		return ret;
-
-	priv->pa_gpio = devm_gpiod_get_optional(dev, "pa", GPIOD_OUT_LOW);
-	if (IS_ERR(priv->pa_gpio)) {
-		ret = PTR_ERR(priv->pa_gpio);
-		dev_err(dev, "failed to get amplifier gpio: %d\n", ret);
-		return ret;
-	}
-
-	ret = graph_parse_of(priv);
-	if (ret < 0) {
-		if (ret != -EPROBE_DEFER)
-			dev_err(dev, "parse error %d\n", ret);
-		goto err;
-	}
-
-	snd_soc_card_set_drvdata(card, priv);
-
-	asoc_simple_debug_info(priv);
-
-	ret = devm_snd_soc_register_card(dev, card);
-	if (ret < 0)
-		goto err;
-
-	return 0;
-err:
-	asoc_simple_clean_reference(card);
-
-	return ret;
 }
 
 static int graph_remove(struct platform_device *pdev)