diff --git a/sound/usb/proc.c b/sound/usb/proc.c
index ffbf4bd..889c550 100644
--- a/sound/usb/proc.c
+++ b/sound/usb/proc.c
@@ -54,6 +54,38 @@
 			     proc_audio_usbid_read);
 }
 
+static const char * const channel_labels[] = {
+	[SNDRV_CHMAP_NA]	= "N/A",
+	[SNDRV_CHMAP_MONO]	= "MONO",
+	[SNDRV_CHMAP_FL]	= "FL",
+	[SNDRV_CHMAP_FR]	= "FR",
+	[SNDRV_CHMAP_FC]	= "FC",
+	[SNDRV_CHMAP_LFE]	= "LFE",
+	[SNDRV_CHMAP_RL]	= "RL",
+	[SNDRV_CHMAP_RR]	= "RR",
+	[SNDRV_CHMAP_FLC]	= "FLC",
+	[SNDRV_CHMAP_FRC]	= "FRC",
+	[SNDRV_CHMAP_RC]	= "RC",
+	[SNDRV_CHMAP_SL]	= "SL",
+	[SNDRV_CHMAP_SR]	= "SR",
+	[SNDRV_CHMAP_TC]	= "TC",
+	[SNDRV_CHMAP_TFL]	= "TFL",
+	[SNDRV_CHMAP_TFC]	= "TFC",
+	[SNDRV_CHMAP_TFR]	= "TFR",
+	[SNDRV_CHMAP_TRL]	= "TRL",
+	[SNDRV_CHMAP_TRC]	= "TRC",
+	[SNDRV_CHMAP_TRR]	= "TRR",
+	[SNDRV_CHMAP_TFLC]	= "TFLC",
+	[SNDRV_CHMAP_TFRC]	= "TFRC",
+	[SNDRV_CHMAP_LLFE]	= "LLFE",
+	[SNDRV_CHMAP_RLFE]	= "RLFE",
+	[SNDRV_CHMAP_TSL]	= "TSL",
+	[SNDRV_CHMAP_TSR]	= "TSR",
+	[SNDRV_CHMAP_BC]	= "BC",
+	[SNDRV_CHMAP_RLC]	= "RLC",
+	[SNDRV_CHMAP_RRC]	= "RRC",
+};
+
 /*
  * proc interface for list the supported pcm formats
  */
@@ -70,7 +102,7 @@
 		snd_iprintf(buffer, "  Interface %d\n", fp->iface);
 		snd_iprintf(buffer, "    Altset %d\n", fp->altsetting);
 		snd_iprintf(buffer, "    Format:");
-		for (fmt = 0; fmt <= SNDRV_PCM_FORMAT_LAST; ++fmt)
+		pcm_for_each_format(fmt)
 			if (fp->formats & pcm_format_to_bits(fmt))
 				snd_iprintf(buffer, " %s",
 					    snd_pcm_format_name(fmt));
@@ -97,6 +129,27 @@
 			snd_iprintf(buffer, "    Data packet interval: %d us\n",
 				    125 * (1 << fp->datainterval));
 		snd_iprintf(buffer, "    Bits: %d\n", fp->fmt_bits);
+
+		if (fp->dsd_raw)
+			snd_iprintf(buffer, "    DSD raw: DOP=%d, bitrev=%d\n",
+				    fp->dsd_dop, fp->dsd_bitrev);
+
+		if (fp->chmap) {
+			const struct snd_pcm_chmap_elem *map = fp->chmap;
+			int c;
+
+			snd_iprintf(buffer, "    Channel map:");
+			for (c = 0; c < map->channels; c++) {
+				if (map->map[c] >= ARRAY_SIZE(channel_labels) ||
+				    !channel_labels[map->map[c]])
+					snd_iprintf(buffer, " --");
+				else
+					snd_iprintf(buffer, " %s",
+						    channel_labels[map->map[c]]);
+			}
+			snd_iprintf(buffer, "\n");
+		}
+
 		// snd_iprintf(buffer, "    Max Packet Size = %d\n", fp->maxpacksize);
 		// snd_iprintf(buffer, "    EP Attribute = %#x\n", fp->attributes);
 	}