ASoC: Intel: Skylake: Automatic DMIC format configuration according to information from NHLT

Automatically choose DMIC pipeline format configuration depending on
information included in NHLT.
Change the access rights of appropriate kcontrols to read-only in order
to prevent user interference.

Signed-off-by: Mateusz Gorski <[email protected]>
Reviewed-by: Cezary Rojewski <[email protected]>
Reviewed-by: Pierre-Louis Bossart <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: Mateusz Gorski

include/uapi/sound/skl-tplg-interface.h

@@ -19,6 +19,7 @@
 #define SKL_CONTROL_TYPE_BYTE_TLV	0x100
 #define SKL_CONTROL_TYPE_MIC_SELECT	0x102
 #define SKL_CONTROL_TYPE_MULTI_IO_SELECT	0x103
+#define SKL_CONTROL_TYPE_MULTI_IO_SELECT_DMIC	0x104
 
 #define HDA_SST_CFG_MAX	900 /* size of copier cfg*/
 #define MAX_IN_QUEUE 8

sound/soc/intel/skylake/skl-topology.c

@@ -1405,6 +1405,18 @@ static int skl_tplg_multi_config_set(struct snd_kcontrol *kcontrol,
 	return skl_tplg_multi_config_set_get(kcontrol, ucontrol, true);
 }
 
+static int skl_tplg_multi_config_get_dmic(struct snd_kcontrol *kcontrol,
+					  struct snd_ctl_elem_value *ucontrol)
+{
+	return skl_tplg_multi_config_set_get(kcontrol, ucontrol, false);
+}
+
+static int skl_tplg_multi_config_set_dmic(struct snd_kcontrol *kcontrol,
+					  struct snd_ctl_elem_value *ucontrol)
+{
+	return skl_tplg_multi_config_set_get(kcontrol, ucontrol, true);
+}
+
 static int skl_tplg_tlv_control_get(struct snd_kcontrol *kcontrol,
 			unsigned int __user *data, unsigned int size)
 {
@@ -1949,6 +1961,11 @@ static const struct snd_soc_tplg_kcontrol_ops skl_tplg_kcontrol_ops[] = {
 		.get = skl_tplg_multi_config_get,
 		.put = skl_tplg_multi_config_set,
 	},
+	{
+		.id = SKL_CONTROL_TYPE_MULTI_IO_SELECT_DMIC,
+		.get = skl_tplg_multi_config_get_dmic,
+		.put = skl_tplg_multi_config_set_dmic,
+	}
 };
 
 static int skl_tplg_fill_pipe_cfg(struct device *dev,
@@ -3109,12 +3126,21 @@ static int skl_tplg_control_load(struct snd_soc_component *cmpnt,
 	case SND_SOC_TPLG_CTL_ENUM:
 		tplg_ec = container_of(hdr,
 				struct snd_soc_tplg_enum_control, hdr);
-		if (kctl->access & SNDRV_CTL_ELEM_ACCESS_READWRITE) {
+		if (kctl->access & SNDRV_CTL_ELEM_ACCESS_READ) {
 			se = (struct soc_enum *)kctl->private_value;
 			if (tplg_ec->priv.size)
-				return skl_init_enum_data(bus->dev, se,
-						tplg_ec);
+				skl_init_enum_data(bus->dev, se, tplg_ec);
 		}
+
+		/*
+		 * now that the control initializations are done, remove
+		 * write permission for the DMIC configuration enums to
+		 * avoid conflicts between NHLT settings and user interaction
+		 */
+
+		if (hdr->ops.get == SKL_CONTROL_TYPE_MULTI_IO_SELECT_DMIC)
+			kctl->access = SNDRV_CTL_ELEM_ACCESS_READ;
+
 		break;
 
 	default:
@@ -3584,6 +3610,37 @@ static int skl_manifest_load(struct snd_soc_component *cmpnt, int index,
 	return 0;
 }
 
+static void skl_tplg_complete(struct snd_soc_component *component)
+{
+	struct snd_soc_dobj *dobj;
+	struct snd_soc_acpi_mach *mach =
+		dev_get_platdata(component->card->dev);
+	int i;
+
+	list_for_each_entry(dobj, &component->dobj_list, list) {
+		struct snd_kcontrol *kcontrol = dobj->control.kcontrol;
+		struct soc_enum *se =
+			(struct soc_enum *)kcontrol->private_value;
+		char **texts = dobj->control.dtexts;
+		char chan_text[4];
+
+		if (dobj->type != SND_SOC_DOBJ_ENUM ||
+		    dobj->control.kcontrol->put !=
+		    skl_tplg_multi_config_set_dmic)
+			continue;
+		sprintf(chan_text, "c%d", mach->mach_params.dmic_num);
+
+		for (i = 0; i < se->items; i++) {
+			struct snd_ctl_elem_value val;
+
+			if (strstr(texts[i], chan_text)) {
+				val.value.enumerated.item[0] = i;
+				kcontrol->put(kcontrol, &val);
+			}
+		}
+	}
+}
+
 static struct snd_soc_tplg_ops skl_tplg_ops  = {
 	.widget_load = skl_tplg_widget_load,
 	.control_load = skl_tplg_control_load,
@@ -3593,6 +3650,7 @@ static struct snd_soc_tplg_ops skl_tplg_ops  = {
 	.io_ops_count = ARRAY_SIZE(skl_tplg_kcontrol_ops),
 	.manifest = skl_manifest_load,
 	.dai_load = skl_dai_load,
+	.complete = skl_tplg_complete,
 };
 
 /*