ASoC: mediatek: common: add soundcard driver common code

Add common code to support of_node of codec parsing, so codec phandle
can be assigned by sound-dai in dts.

Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230116034131.23943-12-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/mediatek/common/Makefile b/sound/soc/mediatek/common/Makefile
index 576deb7..42e636c 100644 (file)
--- a/sound/soc/mediatek/common/Makefile
+++ b/sound/soc/mediatek/common/Makefile
@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0
 # platform driver
-snd-soc-mtk-common-objs := mtk-afe-platform-driver.o mtk-afe-fe-dai.o mtk-dsp-sof-common.o
+snd-soc-mtk-common-objs := mtk-afe-platform-driver.o mtk-afe-fe-dai.o mtk-dsp-sof-common.o mtk-soundcard-driver.o
 obj-$(CONFIG_SND_SOC_MEDIATEK) += snd-soc-mtk-common.o
 
 obj-$(CONFIG_SND_SOC_MTK_BTCVSD) += mtk-btcvsd.o

diff --git a/sound/soc/mediatek/common/mtk-soundcard-driver.c b/sound/soc/mediatek/common/mtk-soundcard-driver.c
new file mode 100644 (file)
index 0000000..7c55c2c
--- /dev/null
+++ b/sound/soc/mediatek/common/mtk-soundcard-driver.c
@@ -0,0 +1,79 @@
+// 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)
+               return -EINVAL;
+
+       /* 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;
+}
+
+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))
+                       return -EINVAL;
+
+               for_each_card_prelinks(card, i, dai_link) {
+                       if (!strcmp(dai_link_name, dai_link->name))
+                               break;
+               }
+
+               if (i >= card->num_links)
+                       return -EINVAL;
+
+               ret = set_card_codec_info(card, sub_node, dai_link);
+               if (ret < 0)
+                       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);

diff --git a/sound/soc/mediatek/common/mtk-soundcard-driver.h b/sound/soc/mediatek/common/mtk-soundcard-driver.h
new file mode 100644 (file)
index 0000000..d92cac1
--- /dev/null
+++ b/sound/soc/mediatek/common/mtk-soundcard-driver.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * mtk-soundcard-driver.h  --  MediaTek soundcard driver common definition
+ *
+ * Copyright (c) 2022 MediaTek Inc.
+ * Author: Trevor Wu <trevor.wu@mediatek.com>
+ */
+
+#ifndef _MTK_SOUNDCARD_DRIVER_H_
+#define _MTK_SOUNDCARD_DRIVER_H_
+
+int parse_dai_link_info(struct snd_soc_card *card);
+void clean_card_reference(struct snd_soc_card *card);
+#endif