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>
diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index 26c420d..7f85023 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -411,11 +411,8 @@
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 @@
}
/**
+ * 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)