ALSA: hda - Create "Digital Mic Capture Volume" correctly for IDT codecs

So far, the digital mic capture volume wasn't created.  This is because
IDT codecs have output amps for digital mics, not input amps, while
input amps should be used for other analog pins.  Thus the automatic
capture volume creation should check both directions for digital mics.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/patch_sigmatel.c

@@ -3580,21 +3580,30 @@ static int get_connection_index(struct hda_codec *codec, hda_nid_t mux,
 }
 
 /* create a volume assigned to the given pin (only if supported) */
+/* return 1 if the volume control is created */
 static int create_elem_capture_vol(struct hda_codec *codec, hda_nid_t nid,
-				   const char *label)
+				   const char *label, int direction)
 {
 	unsigned int caps, nums;
 	char name[32];
+	int err;
 
-	if (!(get_wcaps(codec, nid) & AC_WCAP_IN_AMP))
+	if (direction == HDA_OUTPUT)
+		caps = AC_WCAP_OUT_AMP;
+	else
+		caps = AC_WCAP_IN_AMP;
+	if (!(get_wcaps(codec, nid) & caps))
 		return 0;
-	caps = query_amp_caps(codec, nid, HDA_OUTPUT);
+	caps = query_amp_caps(codec, nid, direction);
 	nums = (caps & AC_AMPCAP_NUM_STEPS) >> AC_AMPCAP_NUM_STEPS_SHIFT;
 	if (!nums)
 		return 0;
 	snprintf(name, sizeof(name), "%s Capture Volume", label);
-	return stac92xx_add_control(codec->spec, STAC_CTL_WIDGET_VOL, name,
-				    HDA_COMPOSE_AMP_VAL(nid, 3, 0, HDA_INPUT));
+	err = stac92xx_add_control(codec->spec, STAC_CTL_WIDGET_VOL, name,
+				    HDA_COMPOSE_AMP_VAL(nid, 3, 0, direction));
+	if (err < 0)
+		return err;
+	return 1;
 }
 
 /* create playback/capture controls for input pins on dmic capable codecs */
@@ -3643,9 +3652,15 @@ static int stac92xx_auto_create_dmic_input_ctls(struct hda_codec *codec,
 		else
 			label = stac92xx_dmic_labels[dimux->num_items];
 
-		err = create_elem_capture_vol(codec, nid, label);
+		err = create_elem_capture_vol(codec, nid, label, HDA_INPUT);
 		if (err < 0)
 			return err;
+		if (!err) {
+			err = create_elem_capture_vol(codec, nid, label,
+						      HDA_OUTPUT);
+			if (err < 0)
+				return err;
+		}
 
 		dimux->items[dimux->num_items].label = label;
 		dimux->items[dimux->num_items].index = index;
@@ -3766,7 +3781,8 @@ static int stac92xx_auto_create_analog_input_ctls(struct hda_codec *codec, const
 			continue;
 
 		err = create_elem_capture_vol(codec, nid,
-					      auto_pin_cfg_labels[i]);
+					      auto_pin_cfg_labels[i],
+					      HDA_INPUT);
 		if (err < 0)
 			return err;