ALSA: hda - Create snd_hda_get_conn_index() helper function

[firefly-linux-kernel-4.4.55.git] / sound / pci / hda / hda_codec.c

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 26c420de91c3c3eeb88777f847ae962ba984df40..7f8502388a822ec3c194f3b87847f67800b243f7 100644 (file)
--- 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) {
@@ -505,6 +502,41 @@ static bool add_conn_list(struct snd_array *array, hda_nid_t nid)
        return true;
 }
 
+/**
+ * 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