ASoC: topology: Allow a widget to have multiple enum controls

This patch can create multiple enumerated mixer controls for a widget.

Previously topology kernel driver assumes a widget can have only one
emumerated mixer control. We need to remove this restriction for Broxton.
Its firmware modules (widgets) may need multiple enum controls based on
the channel and MIC combination.

No ABI change is needed. The ABI allows a widget to embed multiple
controls.
Reported-by: G Kranthi <gudishax.kranthikumar@intel.com>
Signed-off-by: Mengdong Lin <mengdong.lin@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/soc-topology.c

@@ -486,21 +486,24 @@ static void remove_widget(struct snd_soc_component *comp,
 		dobj->ops->widget_unload(comp, dobj);
 
 	/*
-	 * Dynamic Widgets either have 1 enum kcontrol or 1..N mixers.
+	 * Dynamic Widgets either have 1..N enum kcontrols or mixers.
 	 * The enum may either have an array of values or strings.
 	 */
 	if (dobj->widget.kcontrol_enum) {
 		/* enumerated widget mixer */
+		for (i = 0; i < w->num_kcontrols; i++) {
+			struct snd_kcontrol *kcontrol = w->kcontrols[i];
 			struct soc_enum *se =
-			(struct soc_enum *)w->kcontrols[0]->private_value;
+				(struct soc_enum *)kcontrol->private_value;
 
-		snd_ctl_remove(card, w->kcontrols[0]);
+			snd_ctl_remove(card, kcontrol);
 
 			kfree(se->dobj.control.dvalues);
 			for (i = 0; i < se->items; i++)
 				kfree(se->dobj.control.dtexts[i]);
 
 			kfree(se);
+		}
 		kfree(w->kcontrol_news);
 	} else {
 		/* non enumerated widget mixer */
@@ -1256,26 +1259,24 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_dmixer_create(
 }
 
 static struct snd_kcontrol_new *soc_tplg_dapm_widget_denum_create(
-	struct soc_tplg *tplg)
+	struct soc_tplg *tplg, int num_kcontrols)
 {
 	struct snd_kcontrol_new *kc;
 	struct snd_soc_tplg_enum_control *ec;
 	struct soc_enum *se;
-	int i, err;
+	int i, j, err;
 
-	ec = (struct snd_soc_tplg_enum_control *)tplg->pos;
-	tplg->pos += (sizeof(struct snd_soc_tplg_enum_control) +
-		ec->priv.size);
+	kc = kcalloc(num_kcontrols, sizeof(*kc), GFP_KERNEL);
+	if (kc == NULL)
+		return NULL;
 
+	for (i = 0; i < num_kcontrols; i++) {
+		ec = (struct snd_soc_tplg_enum_control *)tplg->pos;
 		/* validate kcontrol */
 		if (strnlen(ec->hdr.name, SNDRV_CTL_ELEM_ID_NAME_MAXLEN) ==
 			    SNDRV_CTL_ELEM_ID_NAME_MAXLEN)
 			return NULL;
 
-	kc = kzalloc(sizeof(*kc), GFP_KERNEL);
-	if (kc == NULL)
-		return NULL;
-
 		se = kzalloc(sizeof(*se), GFP_KERNEL);
 		if (se == NULL)
 			goto err;
@@ -1283,15 +1284,17 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_denum_create(
 		dev_dbg(tplg->dev, " adding DAPM widget enum control %s\n",
 			ec->hdr.name);
 
-	kc->name = ec->hdr.name;
-	kc->private_value = (long)se;
-	kc->iface = SNDRV_CTL_ELEM_IFACE_MIXER;
-	kc->access = ec->hdr.access;
+		kc[i].name = ec->hdr.name;
+		kc[i].private_value = (long)se;
+		kc[i].iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+		kc[i].access = ec->hdr.access;
 
 		/* we only support FL/FR channel mapping atm */
 		se->reg = tplc_chan_get_reg(tplg, ec->channel, SNDRV_CHMAP_FL);
-	se->shift_l = tplc_chan_get_shift(tplg, ec->channel, SNDRV_CHMAP_FL);
-	se->shift_r = tplc_chan_get_shift(tplg, ec->channel, SNDRV_CHMAP_FR);
+		se->shift_l = tplc_chan_get_shift(tplg, ec->channel,
+						  SNDRV_CHMAP_FL);
+		se->shift_r = tplc_chan_get_shift(tplg, ec->channel,
+						  SNDRV_CHMAP_FR);
 
 		se->items = ec->items;
 		se->mask = ec->mask;
@@ -1324,14 +1327,14 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_denum_create(
 		}
 
 		/* map io handlers */
-	err = soc_tplg_kcontrol_bind_io(&ec->hdr, kc, tplg);
+		err = soc_tplg_kcontrol_bind_io(&ec->hdr, &kc[i], tplg);
 		if (err) {
 			soc_control_err(tplg, &ec->hdr, ec->hdr.name);
 			goto err_se;
 		}
 
 		/* pass control to driver for optional further init */
-	err = soc_tplg_init_kcontrol(tplg, kc,
+		err = soc_tplg_init_kcontrol(tplg, &kc[i],
 			(struct snd_soc_tplg_ctl_hdr *)ec);
 		if (err < 0) {
 			dev_err(tplg->dev, "ASoC: failed to init %s\n",
@@ -1339,15 +1342,22 @@ static struct snd_kcontrol_new *soc_tplg_dapm_widget_denum_create(
 			goto err_se;
 		}
 
+		tplg->pos += (sizeof(struct snd_soc_tplg_enum_control) +
+				ec->priv.size);
+	}
+
 	return kc;
 
 err_se:
+	for (; i >= 0; i--) {
 		/* free values and texts */
+		se = (struct soc_enum *)kc[i].private_value;
 		kfree(se->dobj.control.dvalues);
-	for (i = 0; i < ec->items; i++)
-		kfree(se->dobj.control.dtexts[i]);
+		for (j = 0; j < ec->items; j++)
+			kfree(se->dobj.control.dtexts[j]);
 
 		kfree(se);
+	}
 err:
 	kfree(kc);
 
@@ -1499,9 +1509,10 @@ static int soc_tplg_dapm_widget_create(struct soc_tplg *tplg,
 	case SND_SOC_TPLG_DAPM_CTL_ENUM_VIRT:
 	case SND_SOC_TPLG_DAPM_CTL_ENUM_VALUE:
 		template.dobj.widget.kcontrol_enum = 1;
-		template.num_kcontrols = 1;
+		template.num_kcontrols = w->num_kcontrols;
 		template.kcontrol_news =
-			soc_tplg_dapm_widget_denum_create(tplg);
+			soc_tplg_dapm_widget_denum_create(tplg,
+			template.num_kcontrols);
 		if (!template.kcontrol_news) {
 			ret = -ENOMEM;
 			goto hdr_err;