ALSA: hda - Exclude unusable ADCs for ALC88x

On Realtek codecs, a digital mic pin is connected often only to a single
ADC.  But the parser tries to set up all ADCs no matter whether the
digital mic is available, and results in non-selectable input source.

This patch adds a check of input-source availability of each ADC, and
excludes ones that don't support all input sources.

Reference: Novell bnc#561235
	http://bugzilla.novell.com/show_bug.cgi?id=561235

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

1 files changed, 12 insertions, 1 deletions

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index 0fbcbeef1418..2a96bc78964d 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -10021,10 +10021,12 @@ static int patch_alc882(struct hda_codec *codec)
                 spec->init_amp = ALC_INIT_DEFAULT; /* always initialize */
 
         if (!spec->adc_nids && spec->input_mux) {
-                int i;
+                int i, j;
                 spec->num_adc_nids = 0;
                 for (i = 0; i < ARRAY_SIZE(alc882_adc_nids); i++) {
+                        const struct hda_input_mux *imux = spec->input_mux;
                         hda_nid_t cap;
+                        hda_nid_t items[16];
                         hda_nid_t nid = alc882_adc_nids[i];
                         unsigned int wcap = get_wcaps(codec, nid);
                         /* get type */
@@ -10035,6 +10037,15 @@ static int patch_alc882(struct hda_codec *codec)
                         err = snd_hda_get_connections(codec, nid, &cap, 1);
                         if (err < 0)
                                 continue;
+                        err = snd_hda_get_connections(codec, cap, items,
+                                                      ARRAY_SIZE(items));
+                        if (err < 0)
+                                continue;
+                        for (j = 0; j < imux->num_items; j++)
+                                if (imux->items[j].index >= err)
+                                        break;
+                        if (j < imux->num_items)
+                                continue;
                         spec->private_capsrc_nids[spec->num_adc_nids] = cap;
                         spec->num_adc_nids++;
                 }