ALSA: hda - Fix broken workaround for HDMI/SPDIF conflicts

The commit [dcda58061: ALSA: hda - Add workaround for conflicting
IEC958 controls] introduced a workaround for cards that have both
SPDIF and HDMI devices for giving device=1 to SPDIF control elements.
It turned out, however, that this workaround doesn't work well -

- The workaround checks only conflicts in a single codec, but SPDIF
  and HDMI are provided by multiple codecs in many cases, and

- ALSA mixer abstraction doesn't care about the device number in ctl
  elements, thus you'll get errors from amixer such as
  % amixer scontrols -c 0
  ALSA lib simple_none.c:1551:(simple_add1) helem (MIXER,'IEC958
  Playback Switch',0,1,0) appears twice or more
  amixer: Mixer hw:0 load error: Invalid argument

This patch fixes the previous broken workaround.  Instead of changing
the device number of SPDIF ctl elements, shift the element indices of
such controls up to 16.  Also, the conflict check is performed over
all codecs found on the bus.

HDMI devices will be put to dev=0,index=0 as before.  Only the
conflicting SPDIF device is moved to a different place.  The new place
of SPDIF device is supposed by the updated alsa-lib HDA-Intel.conf,
respectively.

Reported-by: Stephan Raue <stephan@openelec.tv>
Reported-by: Anssi Hannula <anssi.hannula@iki.fi>
Cc: <stable@vger.kernel.org> [v3.8]
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 21 insertions, 22 deletions

diff --git a/sound/pci/hda/hda_codec.c b/sound/pci/hda/hda_codec.c
index e80f83568291..04b57383e8cb 100644
--- a/sound/pci/hda/hda_codec.c
+++ b/sound/pci/hda/hda_codec.c
@@ -2332,11 +2332,12 @@ struct snd_kcontrol *snd_hda_find_mixer_ctl(struct hda_codec *codec,
 EXPORT_SYMBOL_HDA(snd_hda_find_mixer_ctl);
 
 static int find_empty_mixer_ctl_idx(struct hda_codec *codec, const char *name,
-                                    int dev)
+                                    int start_idx)
 {
-        int idx;
-        for (idx = 0; idx < 16; idx++) { /* 16 ctlrs should be large enough */
-                if (!find_mixer_ctl(codec, name, dev, idx))
+        int i, idx;
+        /* 16 ctlrs should be large enough */
+        for (i = 0, idx = start_idx; i < 16; i++, idx++) {
+                if (!find_mixer_ctl(codec, name, 0, idx))
                         return idx;
         }
         return -EBUSY;
@@ -3305,30 +3306,29 @@ int snd_hda_create_dig_out_ctls(struct hda_codec *codec,
         int err;
         struct snd_kcontrol *kctl;
         struct snd_kcontrol_new *dig_mix;
-        int idx, dev = 0;
-        const int spdif_pcm_dev = 1;
+        int idx = 0;
+        const int spdif_index = 16;
         struct hda_spdif_out *spdif;
+        struct hda_bus *bus = codec->bus;
 
-        if (codec->primary_dig_out_type == HDA_PCM_TYPE_HDMI &&
+        if (bus->primary_dig_out_type == HDA_PCM_TYPE_HDMI &&
             type == HDA_PCM_TYPE_SPDIF) {
-                dev = spdif_pcm_dev;
-        } else if (codec->primary_dig_out_type == HDA_PCM_TYPE_SPDIF &&
+                idx = spdif_index;
+        } else if (bus->primary_dig_out_type == HDA_PCM_TYPE_SPDIF &&
                    type == HDA_PCM_TYPE_HDMI) {
-                for (idx = 0; idx < codec->spdif_out.used; idx++) {
-                        spdif = snd_array_elem(&codec->spdif_out, idx);
-                        for (dig_mix = dig_mixes; dig_mix->name; dig_mix++) {
-                                kctl = find_mixer_ctl(codec, dig_mix->name, 0, idx);
-                                if (!kctl)
-                                        break;
-                                kctl->id.device = spdif_pcm_dev;
-                        }
+                /* suppose a single SPDIF device */
+                for (dig_mix = dig_mixes; dig_mix->name; dig_mix++) {
+                        kctl = find_mixer_ctl(codec, dig_mix->name, 0, 0);
+                        if (!kctl)
+                                break;
+                        kctl->id.index = spdif_index;
                 }
-                codec->primary_dig_out_type = HDA_PCM_TYPE_HDMI;
+                bus->primary_dig_out_type = HDA_PCM_TYPE_HDMI;
         }
-        if (!codec->primary_dig_out_type)
-                codec->primary_dig_out_type = type;
+        if (!bus->primary_dig_out_type)
+                bus->primary_dig_out_type = type;
 
-        idx = find_empty_mixer_ctl_idx(codec, "IEC958 Playback Switch", dev);
+        idx = find_empty_mixer_ctl_idx(codec, "IEC958 Playback Switch", idx);
         if (idx < 0) {
                 printk(KERN_ERR "hda_codec: too many IEC958 outputs\n");
                 return -EBUSY;
@@ -3338,7 +3338,6 @@ int snd_hda_create_dig_out_ctls(struct hda_codec *codec,
                 kctl = snd_ctl_new1(dig_mix, codec);
                 if (!kctl)
                         return -ENOMEM;
-                kctl->id.device = dev;
                 kctl->id.index = idx;
                 kctl->private_value = codec->spdif_out.used - 1;
                 err = snd_hda_ctl_add(codec, associated_nid, kctl);