ALSA: hda - proc - show which I/O NID is associated to PCM device

Output something like:

Node 0x02 [Audio Output] wcaps 0x11: Stereo
  Device: name="ALC888 Analog", type="Audio", device=0, substream=0
  Converter: stream=0, channel=0
  ...

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/pci/hda/hda_proc.c

@@ -309,7 +309,21 @@ static void print_audio_io(struct snd_info_buffer *buffer,
 			   struct hda_codec *codec, hda_nid_t nid,
 			   unsigned int wid_type)
 {
-	int conv = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_CONV, 0);
+	int pcm, conv;
+	for (pcm = 0; pcm < codec->num_pcms; pcm++) {
+		int type;
+		struct hda_pcm *cpcm = &codec->pcm_info[pcm];
+		for (type = 0; type < 2; type++) {
+			if (cpcm->stream[type].nid != nid || cpcm->pcm == NULL)
+				continue;
+			snd_iprintf(buffer, "  Device: name=\"%s\", type=\"%s\", device=%i, substream=%i\n",
+				cpcm->name,
+				snd_hda_pcm_type_name[cpcm->pcm_type],
+				cpcm->pcm->device,
+				cpcm->pcm->streams[type].substream->number);
+		}
+	}
+	conv = snd_hda_codec_read(codec, nid, 0, AC_VERB_GET_CONV, 0);
 	snd_iprintf(buffer,
 		    "  Converter: stream=%d, channel=%d\n",
 		    (conv & AC_CONV_STREAM) >> AC_CONV_STREAM_SHIFT,