ASoC: Intel: board_helpers: support dmic link initialization

Add functions for machine drivers to initialize dmic01 and dmic16k DAI
links.
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Brent Lu <brent.lu@intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20231019173411.166759-7-pierre-louis.bossart@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/intel/boards/sof_board_helpers.c

@@ -36,9 +36,49 @@ int sof_intel_board_card_late_probe(struct snd_soc_card *card)
 }
 EXPORT_SYMBOL_NS(sof_intel_board_card_late_probe, SND_SOC_INTEL_SOF_BOARD_HELPERS);
 
+/*
+ * DMIC DAI Link
+ */
+static const struct snd_soc_dapm_widget dmic_widgets[] = {
+	SND_SOC_DAPM_MIC("SoC DMIC", NULL),
+};
+
+static const struct snd_soc_dapm_route dmic_routes[] = {
+	{"DMic", NULL, "SoC DMIC"},
+};
+
+static int dmic_init(struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_soc_card *card = rtd->card;
+	int ret;
+
+	ret = snd_soc_dapm_new_controls(&card->dapm, dmic_widgets,
+					ARRAY_SIZE(dmic_widgets));
+	if (ret) {
+		dev_err(rtd->dev, "fail to add dmic widgets, ret %d\n", ret);
+		return ret;
+	}
+
+	ret = snd_soc_dapm_add_routes(&card->dapm, dmic_routes,
+				      ARRAY_SIZE(dmic_routes));
+	if (ret) {
+		dev_err(rtd->dev, "fail to add dmic routes, ret %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 /*
  * DAI Link Helpers
  */
+static struct snd_soc_dai_link_component dmic_component[] = {
+	{
+		.name = "dmic-codec",
+		.dai_name = "dmic-hifi",
+	}
+};
+
 static struct snd_soc_dai_link_component platform_component[] = {
 	{
 		/* name might be overridden during probe */
@@ -46,6 +86,58 @@ static struct snd_soc_dai_link_component platform_component[] = {
 	}
 };
 
+int sof_intel_board_set_dmic_link(struct device *dev,
+				  struct snd_soc_dai_link *link, int be_id,
+				  enum sof_dmic_be_type be_type)
+{
+	struct snd_soc_dai_link_component *cpus;
+
+	/* cpus */
+	cpus = devm_kzalloc(dev, sizeof(struct snd_soc_dai_link_component),
+			    GFP_KERNEL);
+	if (!cpus)
+		return -ENOMEM;
+
+	switch (be_type) {
+	case SOF_DMIC_01:
+		dev_dbg(dev, "link %d: dmic01\n", be_id);
+
+		link->name = "dmic01";
+		cpus->dai_name = "DMIC01 Pin";
+		break;
+	case SOF_DMIC_16K:
+		dev_dbg(dev, "link %d: dmic16k\n", be_id);
+
+		link->name = "dmic16k";
+		cpus->dai_name = "DMIC16k Pin";
+		break;
+	default:
+		dev_err(dev, "invalid be type %d\n", be_type);
+		return -EINVAL;
+	}
+
+	link->cpus = cpus;
+	link->num_cpus = 1;
+
+	/* codecs */
+	link->codecs = dmic_component;
+	link->num_codecs = ARRAY_SIZE(dmic_component);
+
+	/* platforms */
+	link->platforms = platform_component;
+	link->num_platforms = ARRAY_SIZE(platform_component);
+
+	link->id = be_id;
+	if (be_type == SOF_DMIC_01)
+		link->init = dmic_init;
+	link->ignore_suspend = 1;
+	link->no_pcm = 1;
+	link->dpcm_capture = 1;
+
+	return 0;
+}
+EXPORT_SYMBOL_NS(sof_intel_board_set_dmic_link, SND_SOC_INTEL_SOF_BOARD_HELPERS);
+
 int sof_intel_board_set_intel_hdmi_link(struct device *dev,
 					struct snd_soc_dai_link *link, int be_id,
 					int hdmi_id, bool idisp_codec)

sound/soc/intel/boards/sof_board_helpers.h

@@ -28,6 +28,7 @@ struct sof_rt5682_private {
  * @hdmi: init data for hdmi dai link
  * @codec_type: type of headset codec
  * @amp_type: type of speaker amplifier
+ * @dmic_be_num: number of Intel PCH DMIC BE link
  * @hdmi_num: number of Intel HDMI BE link
  * @rt5682: private data for rt5682 machine driver
  */
@@ -38,6 +39,7 @@ struct sof_card_private {
 	enum sof_ssp_codec codec_type;
 	enum sof_ssp_codec amp_type;
 
+	int dmic_be_num;
 	int hdmi_num;
 
 	union {
@@ -45,8 +47,16 @@ struct sof_card_private {
 	};
 };
 
+enum sof_dmic_be_type {
+	SOF_DMIC_01,
+	SOF_DMIC_16K,
+};
+
 int sof_intel_board_card_late_probe(struct snd_soc_card *card);
 
+int sof_intel_board_set_dmic_link(struct device *dev,
+				  struct snd_soc_dai_link *link, int be_id,
+				  enum sof_dmic_be_type be_type);
 int sof_intel_board_set_intel_hdmi_link(struct device *dev,
 					struct snd_soc_dai_link *link, int be_id,
 					int hdmi_id, bool idisp_codec);