ALSA: hda - Create snd_hda_get_conn_index() helper function

Create snd_hda_get_conn_index() helper function for obtaining the
connection index of the widget.  Replaced the similar codes used in
several codec-drivers with this common helper.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

8 files changed, 59 insertions, 108 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 26c420de91c3..7f8502388a82 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -411,11 +411,8 @@ static int _hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
 
 	wcaps = get_wcaps(codec, nid);
 	if (!(wcaps & AC_WCAP_CONN_LIST) &&
-	    get_wcaps_type(wcaps) != AC_WID_VOL_KNB) {
-		snd_printk(KERN_WARNING "hda_codec: "
-			   "connection list not available for 0x%x\n", nid);
-		return -EINVAL;
-	}
+	    get_wcaps_type(wcaps) != AC_WID_VOL_KNB)
+		return 0;
 
 	parm = snd_hda_param_read(codec, nid, AC_PAR_CONNLIST_LEN);
 	if (parm & AC_CLIST_LONG) {
@@ -506,6 +503,41 @@ static bool add_conn_list(struct snd_array *array, hda_nid_t nid)
 }
 
 /**
+ * snd_hda_get_conn_index - get the connection index of the given NID
+ * @codec: the HDA codec
+ * @mux: NID containing the list
+ * @nid: NID to select
+ * @recursive: 1 when searching NID recursively, otherwise 0
+ *
+ * Parses the connection list of the widget @mux and checks whether the
+ * widget @nid is present.  If it is, return the connection index.
+ * Otherwise it returns -1.
+ */
+int snd_hda_get_conn_index(struct hda_codec *codec, hda_nid_t mux,
+			   hda_nid_t nid, int recursive)
+{
+	hda_nid_t conn[HDA_MAX_NUM_INPUTS];
+	int i, nums;
+
+	nums = snd_hda_get_connections(codec, mux, conn, ARRAY_SIZE(conn));
+	for (i = 0; i < nums; i++)
+		if (conn[i] == nid)
+			return i;
+	if (!recursive)
+		return -1;
+	if (recursive > 5) {
+		snd_printd("hda_codec: too deep connection for 0x%x\n", nid);
+		return -1;
+	}
+	recursive++;
+	for (i = 0; i < nums; i++)
+		if (snd_hda_get_conn_index(codec, conn[i], nid, recursive) >= 0)
+			return i;
+	return -1;
+}
+EXPORT_SYMBOL_HDA(snd_hda_get_conn_index);
+
+/**
  * snd_hda_queue_unsol_event - add an unsolicited event to queue
  * @bus: the BUS
  * @res: unsolicited event (lower 32bit of RIRB entry)
diff --git a/sound/pci/hda/hda_codec.h b/sound/pci/hda/hda_codec.h
index 79ef65e3ae14..10d500d2ba33 100644
--- a/sound/pci/hda/hda_codec.h
+++ b/sound/pci/hda/hda_codec.h
@@ -905,6 +905,8 @@ int snd_hda_get_connections(struct hda_codec *codec, hda_nid_t nid,
 			    hda_nid_t *conn_list, int max_conns);
 int snd_hda_get_conn_list(struct hda_codec *codec, hda_nid_t nid,
 			  const hda_nid_t **listp);
+int snd_hda_get_conn_index(struct hda_codec *codec, hda_nid_t mux,
+			   hda_nid_t nid, int recursive);
 int snd_hda_query_supported_pcm(struct hda_codec *codec, hda_nid_t nid,
 				u32 *ratesp, u64 *formatsp, unsigned int *bpsp);
 
diff --git a/sound/pci/hda/patch_cirrus.c b/sound/pci/hda/patch_cirrus.c
index c7b5ca28fa77..7f93739b1e33 100644
--- a/sound/pci/hda/patch_cirrus.c
+++ b/sound/pci/hda/patch_cirrus.c
@@ -346,21 +346,15 @@ static hda_nid_t get_adc(struct hda_codec *codec, hda_nid_t pin,
 
 	nid = codec->start_nid;
 	for (i = 0; i < codec->num_nodes; i++, nid++) {
-		hda_nid_t pins[2];
 		unsigned int type;
-		int j, nums;
+		int idx;
 		type = get_wcaps_type(get_wcaps(codec, nid));
 		if (type != AC_WID_AUD_IN)
 			continue;
-		nums = snd_hda_get_connections(codec, nid, pins,
-					       ARRAY_SIZE(pins));
-		if (nums <= 0)
-			continue;
-		for (j = 0; j < nums; j++) {
-			if (pins[j] == pin) {
-				*idxp = j;
-				return nid;
-			}
+		idx = snd_hda_get_conn_index(codec, nid, pin, 0);
+		if (idx >= 0) {
+			*idxp = idx;
+			return nid;
 		}
 	}
 	return 0;
diff --git a/sound/pci/hda/patch_cmedia.c b/sound/pci/hda/patch_cmedia.c
index 9eaf99b01aec..08af4847c07a 100644
--- a/sound/pci/hda/patch_cmedia.c
+++ b/sound/pci/hda/patch_cmedia.c
@@ -403,7 +403,6 @@ static int cmi9880_fill_multi_init(struct hda_codec *codec, const struct auto_pi
 	/* clear the table, only one c-media dac assumed here */
 	memset(spec->multi_init, 0, sizeof(spec->multi_init));
 	for (j = 0, i = 0; i < cfg->line_outs; i++) {
-		hda_nid_t conn[4];
 		nid = cfg->line_out_pins[i];
 		/* set as output */
 		spec->multi_init[j].nid = nid;
@@ -416,12 +415,10 @@ static int cmi9880_fill_multi_init(struct hda_codec *codec, const struct auto_pi
 			spec->multi_init[j].verb = AC_VERB_SET_CONNECT_SEL;
 			spec->multi_init[j].param = 0;
 			/* find the index in connect list */
-			len = snd_hda_get_connections(codec, nid, conn, 4);
-			for (k = 0; k < len; k++)
-				if (conn[k] == spec->dac_nids[i]) {
-					spec->multi_init[j].param = k;
-					break;
-				}
+			k = snd_hda_get_conn_index(codec, nid,
+						   spec->dac_nids[i], 0);
+			if (k >= 0)
+				spec->multi_init[j].param = k;
 			j++;
 		}
 	}
diff --git a/sound/pci/hda/patch_conexant.c b/sound/pci/hda/patch_conexant.c
index 6e864276b744..40cf7f16f587 100644
--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -3308,19 +3308,8 @@ static const struct hda_pcm_stream cx_auto_pcm_analog_capture = {
 
 static const hda_nid_t cx_auto_adc_nids[] = { 0x14 };
 
-/* get the connection index of @nid in the widget @mux */
-static int get_connection_index(struct hda_codec *codec, hda_nid_t mux,
-				hda_nid_t nid)
-{
-	hda_nid_t conn[HDA_MAX_NUM_INPUTS];
-	int i, nums;
-
-	nums = snd_hda_get_connections(codec, mux, conn, ARRAY_SIZE(conn));
-	for (i = 0; i < nums; i++)
-		if (conn[i] == nid)
-			return i;
-	return -1;
-}
+#define get_connection_index(codec, mux, nid)\
+	snd_hda_get_conn_index(codec, mux, nid, 0)
 
 /* get an unassigned DAC from the given list.
  * Return the nid if found and reduce the DAC list, or return zero if
diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index cf383ede281d..7b96dcef2c62 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -1195,18 +1195,8 @@ static void alc_line_automute(struct hda_codec *codec)
 	update_speakers(codec);
 }
 
-static int get_connection_index(struct hda_codec *codec, hda_nid_t mux,
-				hda_nid_t nid)
-{
-	hda_nid_t conn[HDA_MAX_NUM_INPUTS];
-	int i, nums;
-
-	nums = snd_hda_get_connections(codec, mux, conn, ARRAY_SIZE(conn));
-	for (i = 0; i < nums; i++)
-		if (conn[i] == nid)
-			return i;
-	return -1;
-}
+#define get_connection_index(codec, mux, nid) \
+	snd_hda_get_conn_index(codec, mux, nid, 0)
 
 /* switch the current ADC according to the jack state */
 static void alc_dual_mic_adc_auto_switch(struct hda_codec *codec)
diff --git a/sound/pci/hda/patch_sigmatel.c b/sound/pci/hda/patch_sigmatel.c
index 7407095cbc78..56425a53cf1b 100644
--- a/sound/pci/hda/patch_sigmatel.c
+++ b/sound/pci/hda/patch_sigmatel.c
@@ -3408,30 +3408,9 @@ static hda_nid_t get_connected_node(struct hda_codec *codec, hda_nid_t mux,
 	return 0;
 }
 
-static int get_connection_index(struct hda_codec *codec, hda_nid_t mux,
-				hda_nid_t nid)
-{
-	hda_nid_t conn[HDA_MAX_NUM_INPUTS];
-	int i, nums;
-
-	if (!(get_wcaps(codec, mux) & AC_WCAP_CONN_LIST))
-		return -1;
-
-	nums = snd_hda_get_connections(codec, mux, conn, ARRAY_SIZE(conn));
-	for (i = 0; i < nums; i++)
-		if (conn[i] == nid)
-			return i;
-
-	for (i = 0; i < nums; i++) {
-		unsigned int wid_caps = get_wcaps(codec, conn[i]);
-		unsigned int wid_type = get_wcaps_type(wid_caps);
-
-		if (wid_type != AC_WID_PIN && wid_type != AC_WID_AUD_MIX)
-			if (get_connection_index(codec, conn[i], nid) >= 0)
-				return i;
-	}
-	return -1;
-}
+/* look for NID recursively */
+#define get_connection_index(codec, mux, nid) \
+	snd_hda_get_conn_index(codec, mux, nid, 1)
 
 /* create a volume assigned to the given pin (only if supported) */
 /* return 1 if the volume control is created */
diff --git a/sound/pci/hda/patch_via.c b/sound/pci/hda/patch_via.c
index 997b7057a549..76142c1389d7 100644
--- a/sound/pci/hda/patch_via.c
+++ b/sound/pci/hda/patch_via.c
@@ -410,27 +410,8 @@ static int via_new_analog_input(struct via_spec *spec, const char *ctlname,
 	return 0;
 }
 
-/* return the index of the given widget nid as the source of mux;
- * return -1 if not found;
- * if num_conns is non-NULL, set the total number of connections
- */
-static int __get_connection_index(struct hda_codec *codec, hda_nid_t mux,
-				  hda_nid_t nid, int *num_conns)
-{
-	hda_nid_t conn[HDA_MAX_NUM_INPUTS];
-	int i, nums;
-
-	nums = snd_hda_get_connections(codec, mux, conn, ARRAY_SIZE(conn));
-	if (num_conns)
-		*num_conns = nums;
-	for (i = 0; i < nums; i++)
-		if (conn[i] == nid)
-			return i;
-	return -1;
-}
-
 #define get_connection_index(codec, mux, nid) \
-	__get_connection_index(codec, mux, nid, NULL)
+	snd_hda_get_conn_index(codec, mux, nid, 0)
 
 static bool check_amp_caps(struct hda_codec *codec, hda_nid_t nid, int dir,
 			   unsigned int mask)
@@ -2011,23 +1992,10 @@ static void add_loopback_list(struct via_spec *spec, hda_nid_t mix, int idx)
 	spec->loopback.amplist = spec->loopback_list;
 }
 
-/* check whether the path from src to dst is reachable */
 static bool is_reachable_nid(struct hda_codec *codec, hda_nid_t src,
-			     hda_nid_t dst, int depth)
+			     hda_nid_t dst)
 {
-	hda_nid_t conn[8];
-	int i, nums;
-
-	nums = snd_hda_get_connections(codec, src, conn, ARRAY_SIZE(conn));
-	for (i = 0; i < nums; i++)
-		if (conn[i] == dst)
-			return true;
-	if (++depth > MAX_NID_PATH_DEPTH)
-		return false;
-	for (i = 0; i < nums; i++)
-		if (is_reachable_nid(codec, conn[i], dst, depth))
-			return true;
-	return false;
+	return snd_hda_get_conn_index(codec, src, dst, 1) >= 0;
 }
 
 /* add the input-route to the given pin */
@@ -2046,7 +2014,7 @@ static bool add_input_route(struct hda_codec *codec, hda_nid_t pin)
 				continue;
 			spec->inputs[spec->num_inputs].mux_idx = idx;
 		} else {
-			if (!is_reachable_nid(codec, spec->adc_nids[c], pin, 0))
+			if (!is_reachable_nid(codec, spec->adc_nids[c], pin))
 				continue;
 		}
 		spec->inputs[spec->num_inputs].adc_idx = c;