1 files changed, 134 insertions, 0 deletions
diff --git a/sound/soc/mediatek/common/mtk-soundcard-driver.c b/sound/soc/mediatek/common/mtk-soundcard-driver.c
new file mode 100644
index 0000000000..a58e1e3674
--- /dev/null
+++ b/sound/soc/mediatek/common/mtk-soundcard-driver.c
@@ -0,0 +1,134 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * mtk-soundcard-driver.c  --  MediaTek soundcard driver common
+ *
+ * Copyright (c) 2022 MediaTek Inc.
+ * Author: Trevor Wu <trevor.wu@mediatek.com>
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <sound/soc.h>
+
+#include "mtk-soundcard-driver.h"
+
+static int set_card_codec_info(struct snd_soc_card *card,
+			       struct device_node *sub_node,
+			       struct snd_soc_dai_link *dai_link)
+{
+	struct device *dev = card->dev;
+	struct device_node *codec_node;
+	int ret;
+
+	codec_node = of_get_child_by_name(sub_node, "codec");
+	if (!codec_node) {
+		dev_dbg(dev, "%s no specified codec\n", dai_link->name);
+		return 0;
+	}
+
+	/* set card codec info */
+	ret = snd_soc_of_get_dai_link_codecs(dev, codec_node, dai_link);
+
+	of_node_put(codec_node);
+
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "%s: codec dai not found\n",
+				     dai_link->name);
+
+	return 0;
+}
+
+static int set_dailink_daifmt(struct snd_soc_card *card,
+			      struct device_node *sub_node,
+			      struct snd_soc_dai_link *dai_link)
+{
+	unsigned int daifmt;
+	const char *str;
+	int ret;
+	struct {
+		char *name;
+		unsigned int val;
+	} of_clk_table[] = {
+		{ "cpu",	SND_SOC_DAIFMT_CBC_CFC },
+		{ "codec",	SND_SOC_DAIFMT_CBP_CFP },
+	};
+
+	daifmt = snd_soc_daifmt_parse_format(sub_node, NULL);
+	if (daifmt) {
+		dai_link->dai_fmt &= SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
+		dai_link->dai_fmt |= daifmt;
+	}
+
+	/*
+	 * check "mediatek,clk-provider = xxx"
+	 * SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK area
+	 */
+	ret = of_property_read_string(sub_node, "mediatek,clk-provider", &str);
+	if (ret == 0) {
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(of_clk_table); i++) {
+			if (strcmp(str, of_clk_table[i].name) == 0) {
+				dai_link->dai_fmt &= ~SND_SOC_DAIFMT_CLOCK_PROVIDER_MASK;
+				dai_link->dai_fmt |= of_clk_table[i].val;
+				break;
+			}
+		}
+	}
+
+	return 0;
+}
+
+int parse_dai_link_info(struct snd_soc_card *card)
+{
+	struct device *dev = card->dev;
+	struct device_node *sub_node;
+	struct snd_soc_dai_link *dai_link;
+	const char *dai_link_name;
+	int ret, i;
+
+	/* Loop over all the dai link sub nodes */
+	for_each_available_child_of_node(dev->of_node, sub_node) {
+		if (of_property_read_string(sub_node, "link-name",
+					    &dai_link_name)) {
+			of_node_put(sub_node);
+			return -EINVAL;
+		}
+
+		for_each_card_prelinks(card, i, dai_link) {
+			if (!strcmp(dai_link_name, dai_link->name))
+				break;
+		}
+
+		if (i >= card->num_links) {
+			of_node_put(sub_node);
+			return -EINVAL;
+		}
+
+		ret = set_card_codec_info(card, sub_node, dai_link);
+		if (ret < 0) {
+			of_node_put(sub_node);
+			return ret;
+		}
+
+		ret = set_dailink_daifmt(card, sub_node, dai_link);
+		if (ret < 0) {
+			of_node_put(sub_node);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(parse_dai_link_info);
+
+void clean_card_reference(struct snd_soc_card *card)
+{
+	struct snd_soc_dai_link *dai_link;
+	int i;
+
+	/* release codec reference gotten by set_card_codec_info */
+	for_each_card_prelinks(card, i, dai_link)
+		snd_soc_of_put_dai_link_codecs(dai_link);
+}
+EXPORT_SYMBOL_GPL(clean_card_reference);