ASoC: audio-graph-card: add link_info

Current audio-graph-card is parsing DAI link for both "normal sound" and
"DPCM sound". On this driver, it needs to count and parse
DAIs/Links/Codec Conf from each links.
Then, counting/parsing link loop are very similar, but using different
implementation. Because of this background, the link loop code is very
mysterious. Mystery code will be trouble in the future.

To preparing cleanup code, this patch adds link_info which handles
number of DAIs/Links/Codec Conf, and CPU/Codec turn.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

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

@@ -39,6 +39,13 @@ struct graph_card_data {
 	struct gpio_desc *pa_gpio;
 };
 
+struct link_info {
+	int dais; /* number of dai  */
+	int link; /* number of link */
+	int conf; /* number of codec_conf */
+	int cpu;  /* turn for CPU / Codec */
+};
+
 #define graph_priv_to_card(priv) (&(priv)->snd_card)
 #define graph_priv_to_props(priv, i) ((priv)->dai_props + (i))
 #define graph_priv_to_dev(priv) (graph_priv_to_card(priv)->dev)
@@ -189,13 +196,12 @@ static int asoc_graph_card_dai_link_of_dpcm(struct device_node *top,
 					    struct device_node *cpu_ep,
 					    struct device_node *codec_ep,
 					    struct graph_card_data *priv,
-					    int *dai_idx, int link_idx,
-					    int *conf_idx, int is_cpu)
+					    struct link_info *li)
 {
 	struct device *dev = graph_priv_to_dev(priv);
-	struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, link_idx);
-	struct graph_dai_props *dai_props = graph_priv_to_props(priv, link_idx);
-	struct device_node *ep = is_cpu ? cpu_ep : codec_ep;
+	struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, li->link);
+	struct graph_dai_props *dai_props = graph_priv_to_props(priv, li->link);
+	struct device_node *ep = li->cpu ? cpu_ep : codec_ep;
 	struct device_node *port = of_get_parent(ep);
 	struct device_node *ports = of_get_parent(port);
 	struct device_node *node = of_graph_get_port_parent(ep);
@@ -203,7 +209,9 @@ static int asoc_graph_card_dai_link_of_dpcm(struct device_node *top,
 	struct snd_soc_dai_link_component *codecs = dai_link->codecs;
 	int ret;
 
-	dev_dbg(dev, "link_of DPCM (for %s)\n", is_cpu ? "CPU" : "Codec");
+	li->link++;
+
+	dev_dbg(dev, "link_of DPCM (%pOF)\n", ep);
 
 	of_property_read_u32(top,   "mclk-fs", &dai_props->mclk_fs);
 	of_property_read_u32(ports, "mclk-fs", &dai_props->mclk_fs);
@@ -215,7 +223,7 @@ static int asoc_graph_card_dai_link_of_dpcm(struct device_node *top,
 	of_node_put(ports);
 	of_node_put(port);
 
-	if (is_cpu) {
+	if (li->cpu) {
 
 		/* BE is dummy */
 		codecs->of_node		= NULL;
@@ -227,7 +235,7 @@ static int asoc_graph_card_dai_link_of_dpcm(struct device_node *top,
 		dai_link->dpcm_merged_format	= 1;
 
 		dai =
-		dai_props->cpu_dai	= &priv->dais[(*dai_idx)++];
+		dai_props->cpu_dai	= &priv->dais[li->dais++];
 
 		ret = asoc_simple_card_parse_graph_cpu(ep, dai_link);
 		if (ret)
@@ -259,10 +267,10 @@ static int asoc_graph_card_dai_link_of_dpcm(struct device_node *top,
 		dai_link->be_hw_params_fixup	= asoc_graph_card_be_hw_params_fixup;
 
 		dai =
-		dai_props->codec_dai	= &priv->dais[(*dai_idx)++];
+		dai_props->codec_dai	= &priv->dais[li->dais++];
 
 		cconf =
-		dai_props->codec_conf	= &priv->codec_conf[(*conf_idx)++];
+		dai_props->codec_conf	= &priv->codec_conf[li->conf++];
 
 		ret = asoc_simple_card_parse_graph_codec(ep, dai_link);
 		if (ret < 0)
@@ -314,11 +322,11 @@ static int asoc_graph_card_dai_link_of(struct device_node *top,
 					struct device_node *cpu_ep,
 					struct device_node *codec_ep,
 					struct graph_card_data *priv,
-					int *dai_idx, int link_idx)
+					struct link_info *li)
 {
 	struct device *dev = graph_priv_to_dev(priv);
-	struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, link_idx);
-	struct graph_dai_props *dai_props = graph_priv_to_props(priv, link_idx);
+	struct snd_soc_dai_link *dai_link = graph_priv_to_link(priv, li->link);
+	struct graph_dai_props *dai_props = graph_priv_to_props(priv, li->link);
 	struct device_node *cpu_port = of_get_parent(cpu_ep);
 	struct device_node *codec_port = of_get_parent(codec_ep);
 	struct device_node *cpu_ports = of_get_parent(cpu_port);
@@ -327,12 +335,14 @@ static int asoc_graph_card_dai_link_of(struct device_node *top,
 	struct asoc_simple_dai *codec_dai;
 	int ret;
 
-	dev_dbg(dev, "link_of\n");
+	dev_dbg(dev, "link_of (%pOF)\n", cpu_ep);
+
+	li->link++;
 
 	cpu_dai			=
-	dai_props->cpu_dai	= &priv->dais[(*dai_idx)++];
+	dai_props->cpu_dai	= &priv->dais[li->dais++];
 	codec_dai		=
-	dai_props->codec_dai	= &priv->dais[(*dai_idx)++];
+	dai_props->codec_dai	= &priv->dais[li->dais++];
 
 	/* Factor to mclk, used in hw_params() */
 	of_property_read_u32(top,         "mclk-fs", &dai_props->mclk_fs);
@@ -409,9 +419,8 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
 	struct device_node *codec_port		= NULL;
 	struct device_node *codec_port_old	= NULL;
 	struct asoc_simple_card_data adata;
+	struct link_info li;
 	int rc, ret;
-	int link_idx, dai_idx, conf_idx;
-	int cpu;
 
 	ret = asoc_simple_card_of_parse_widgets(card, NULL);
 	if (ret < 0)
@@ -421,11 +430,9 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
 	if (ret < 0)
 		return ret;
 
-	link_idx	= 0;
-	dai_idx		= 0;
-	conf_idx	= 0;
+	memset(&li, 0, sizeof(li));
 	codec_port_old	= NULL;
-	for (cpu = 1; cpu >= 0; cpu--) {
+	for (li.cpu = 1; li.cpu >= 0; li.cpu--) {
 		/*
 		 * Detect all CPU first, and Detect all Codec 2nd.
 		 *
@@ -464,22 +471,19 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
 					/*
 					 * for DPCM sound
 					 */
-					if (!cpu) {
+					if (!li.cpu) {
 						if (codec_port_old == codec_port)
 							continue;
 						codec_port_old = codec_port;
 					}
 					ret = asoc_graph_card_dai_link_of_dpcm(
-						top, cpu_ep, codec_ep, priv,
-						&dai_idx, link_idx++,
-						&conf_idx, cpu);
-				} else if (cpu) {
+						top, cpu_ep, codec_ep, priv, &li);
+				} else if (li.cpu) {
 					/*
 					 * for Normal sound
 					 */
 					ret = asoc_graph_card_dai_link_of(
-						top, cpu_ep, codec_ep, priv,
-						&dai_idx, link_idx++);
+						top, cpu_ep, codec_ep, priv, &li);
 				}
 				if (ret < 0)
 					return ret;
@@ -491,9 +495,7 @@ static int asoc_graph_card_parse_of(struct graph_card_data *priv)
 }
 
 static void asoc_graph_get_dais_count(struct device *dev,
-				      int *link_num,
-				      int *dais_num,
-				      int *ccnf_num)
+				      struct link_info *li)
 {
 	struct of_phandle_iterator it;
 	struct device_node *node = dev->of_node;
@@ -566,8 +568,8 @@ static void asoc_graph_get_dais_count(struct device *dev,
 			of_node_put(codec_ep);
 			of_node_put(codec_port);
 
-			(*link_num)++;
-			(*dais_num)++;
+			li->link++;
+			li->dais++;
 
 			memset(&adata, 0, sizeof(adata));
 			asoc_graph_card_get_conversion(dev, codec_ep, &adata);
@@ -579,11 +581,11 @@ static void asoc_graph_get_dais_count(struct device *dev,
 				if (codec_port_old == codec_port)
 					continue;
 
-				(*link_num)++;
-				(*ccnf_num)++;
-				(*dais_num)++;
+				li->link++;
+				li->conf++;
+				li->dais++;
 			} else {
-				(*dais_num)++;
+				li->dais++;
 			}
 			codec_port_old = codec_port;
 		}
@@ -615,7 +617,7 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct snd_soc_card *card;
 	struct snd_soc_codec_conf *cconf;
-	int lnum = 0, dnum = 0, cnum = 0;
+	struct link_info li;
 	int ret, i;
 
 	/* Allocate the private data and the DAI link array */
@@ -623,14 +625,15 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
 	if (!priv)
 		return -ENOMEM;
 
-	asoc_graph_get_dais_count(dev, &lnum, &dnum, &cnum);
-	if (!lnum || !dnum)
+	memset(&li, 0, sizeof(li));
+	asoc_graph_get_dais_count(dev, &li);
+	if (!li.link || !li.dais)
 		return -EINVAL;
 
-	dai_props = devm_kcalloc(dev, lnum, sizeof(*dai_props), GFP_KERNEL);
-	dai_link  = devm_kcalloc(dev, lnum, sizeof(*dai_link),  GFP_KERNEL);
-	dais      = devm_kcalloc(dev, dnum, sizeof(*dais),      GFP_KERNEL);
-	cconf     = devm_kcalloc(dev, cnum, sizeof(*cconf),     GFP_KERNEL);
+	dai_props = devm_kcalloc(dev, li.link, sizeof(*dai_props), GFP_KERNEL);
+	dai_link  = devm_kcalloc(dev, li.link, sizeof(*dai_link),  GFP_KERNEL);
+	dais      = devm_kcalloc(dev, li.dais, sizeof(*dais),      GFP_KERNEL);
+	cconf     = devm_kcalloc(dev, li.conf, sizeof(*cconf),     GFP_KERNEL);
 	if (!dai_props || !dai_link || !dais)
 		return -ENOMEM;
 
@@ -640,7 +643,7 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
 	 * see
 	 *	soc-core.c :: snd_soc_init_multicodec()
 	 */
-	for (i = 0; i < lnum; i++) {
+	for (i = 0; i < li.link; i++) {
 		dai_link[i].codecs	= &dai_props[i].codecs;
 		dai_link[i].num_codecs	= 1;
 		dai_link[i].platform	= &dai_props[i].platform;
@@ -663,12 +666,12 @@ static int asoc_graph_card_probe(struct platform_device *pdev)
 	card->owner		= THIS_MODULE;
 	card->dev		= dev;
 	card->dai_link		= dai_link;
-	card->num_links		= lnum;
+	card->num_links		= li.link;
 	card->dapm_widgets	= asoc_graph_card_dapm_widgets;
 	card->num_dapm_widgets	= ARRAY_SIZE(asoc_graph_card_dapm_widgets);
 	card->probe		= asoc_graph_soc_card_probe;
 	card->codec_conf	= cconf;
-	card->num_configs	= cnum;
+	card->num_configs	= li.conf;
 
 	ret = asoc_graph_card_parse_of(priv);
 	if (ret < 0) {