ASoC: soc-utils: add snd_soc_dlc_is_dummy()

Merge series from Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>:

We are using dummy component/dlc, but didn't have its check funciton.
This patch adds it.

Author: broonie

include/sound/soc.h

@@ -936,7 +936,7 @@ snd_soc_link_to_platform(struct snd_soc_dai_link *link, int n) {
 
 extern struct snd_soc_dai_link_component null_dailink_component[0];
 extern struct snd_soc_dai_link_component snd_soc_dummy_dlc;
-
+int snd_soc_dlc_is_dummy(struct snd_soc_dai_link_component *dlc);
 
 struct snd_soc_codec_conf {
 	/*

sound/soc/mediatek/mt8188/mt8188-mt6359.c

@@ -1333,11 +1333,11 @@ static int mt8188_mt6359_soc_card_probe(struct mtk_soc_card_data *soc_card_data,
 	for_each_card_prelinks(card, i, dai_link) {
 		if (strcmp(dai_link->name, "DPTX_BE") == 0) {
 			if (dai_link->num_codecs &&
-			    strcmp(dai_link->codecs->dai_name, "snd-soc-dummy-dai"))
+			    !snd_soc_dlc_is_dummy(dai_link->codecs))
 				dai_link->init = mt8188_dptx_codec_init;
 		} else if (strcmp(dai_link->name, "ETDM3_OUT_BE") == 0) {
 			if (dai_link->num_codecs &&
-			    strcmp(dai_link->codecs->dai_name, "snd-soc-dummy-dai"))
+			    !snd_soc_dlc_is_dummy(dai_link->codecs))
 				dai_link->init = mt8188_hdmi_codec_init;
 		} else if (strcmp(dai_link->name, "DL_SRC_BE") == 0 ||
 			   strcmp(dai_link->name, "UL_SRC_BE") == 0) {
@@ -1387,7 +1387,7 @@ static int mt8188_mt6359_soc_card_probe(struct mtk_soc_card_data *soc_card_data,
 					init_es8326 = true;
 				}
 			} else {
-				if (strcmp(dai_link->codecs->dai_name, "snd-soc-dummy-dai")) {
+				if (!snd_soc_dlc_is_dummy(dai_link->codecs)) {
 					if (!init_dumb) {
 						dai_link->init = mt8188_dumb_amp_init;
 						init_dumb = true;

sound/soc/mediatek/mt8195/mt8195-mt6359.c

@@ -1388,11 +1388,11 @@ static int mt8195_mt6359_soc_card_probe(struct mtk_soc_card_data *soc_card_data,
 	for_each_card_prelinks(card, i, dai_link) {
 		if (strcmp(dai_link->name, "DPTX_BE") == 0) {
 			if (dai_link->num_codecs &&
-			    strcmp(dai_link->codecs->dai_name, "snd-soc-dummy-dai"))
+			    !snd_soc_dlc_is_dummy(dai_link->codecs))
 				dai_link->init = mt8195_dptx_codec_init;
 		} else if (strcmp(dai_link->name, "ETDM3_OUT_BE") == 0) {
 			if (dai_link->num_codecs &&
-			    strcmp(dai_link->codecs->dai_name, "snd-soc-dummy-dai"))
+			    !snd_soc_dlc_is_dummy(dai_link->codecs))
 				dai_link->init = mt8195_hdmi_codec_init;
 		} else if (strcmp(dai_link->name, "DL_SRC_BE") == 0 ||
 			   strcmp(dai_link->name, "UL_SRC1_BE") == 0 ||
@@ -1432,7 +1432,7 @@ static int mt8195_mt6359_soc_card_probe(struct mtk_soc_card_data *soc_card_data,
 					codec_init |= RT5682_CODEC_INIT;
 				}
 			} else {
-				if (strcmp(dai_link->codecs->dai_name, "snd-soc-dummy-dai")) {
+				if (!snd_soc_dlc_is_dummy(dai_link->codecs)) {
 					if (!(codec_init & DUMB_CODEC_INIT)) {
 						dai_link->init = mt8195_dumb_amp_init;
 						codec_init |= DUMB_CODEC_INIT;

sound/soc/soc-utils.c

@@ -262,6 +262,19 @@ struct snd_soc_dai_link_component snd_soc_dummy_dlc = {
 };
 EXPORT_SYMBOL_GPL(snd_soc_dummy_dlc);
 
+int snd_soc_dlc_is_dummy(struct snd_soc_dai_link_component *dlc)
+{
+	if (dlc == &snd_soc_dummy_dlc)
+		return true;
+
+	if (strcmp(dlc->name,	  snd_soc_dummy_dlc.name)	== 0 ||
+	    strcmp(dlc->dai_name, snd_soc_dummy_dlc.dai_name)	== 0)
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(snd_soc_dlc_is_dummy);
+
 static int snd_soc_dummy_probe(struct faux_device *fdev)
 {
 	int ret;