diff --git a/Documentation/sound/alsa/Channel-Mapping-API.txt b/Documentation/sound/alsa/Channel-Mapping-API.txt
index 4bbf12d..3c43d1a 100644
--- a/Documentation/sound/alsa/Channel-Mapping-API.txt
+++ b/Documentation/sound/alsa/Channel-Mapping-API.txt
@@ -76,8 +76,10 @@
 
 /* channel positions */
 enum {
-	/* this follows the alsa-lib mixer channel value + 1 */
 	SNDRV_CHMAP_UNKNOWN = 0,
+	SNDRV_CHMAP_NA,		/* N/A, silent */
+	SNDRV_CHMAP_MONO,	/* mono stream */
+	/* this follows the alsa-lib mixer channel value + 3 */
 	SNDRV_CHMAP_FL,		/* front left */
 	SNDRV_CHMAP_FR,		/* front right */
 	SNDRV_CHMAP_RL,		/* rear left */
@@ -98,8 +100,13 @@
 	SNDRV_CHMAP_FCH,	/* front center high */
 	SNDRV_CHMAP_FRH,	/* front right high */
 	SNDRV_CHMAP_TC,		/* top center */
-	SNDRV_CHMAP_NA,		/* N/A, silent */
-	SNDRV_CHMAP_LAST = SNDRV_CHMAP_NA,
+	SNDRV_CHMAP_TFL,	/* top front left */
+	SNDRV_CHMAP_TFR,	/* top front right */
+	SNDRV_CHMAP_TFC,	/* top front center */
+	SNDRV_CHMAP_TRL,	/* top rear left */
+	SNDRV_CHMAP_TRR,	/* top rear right */
+	SNDRV_CHMAP_TRC,	/* top rear center */
+	SNDRV_CHMAP_LAST = SNDRV_CHMAP_TRC,
 };
 
 When a PCM stream can provide more than one channel map, you can
diff --git a/include/sound/asound.h b/include/sound/asound.h
index 27686da..dfe7d44 100644
--- a/include/sound/asound.h
+++ b/include/sound/asound.h
@@ -474,8 +474,10 @@
 
 /* channel positions */
 enum {
-	/* this follows the alsa-lib mixer channel value + 1 */
 	SNDRV_CHMAP_UNKNOWN = 0,
+	SNDRV_CHMAP_NA,		/* N/A, silent */
+	SNDRV_CHMAP_MONO,	/* mono stream */
+	/* this follows the alsa-lib mixer channel value + 3 */
 	SNDRV_CHMAP_FL,		/* front left */
 	SNDRV_CHMAP_FR,		/* front right */
 	SNDRV_CHMAP_RL,		/* rear left */
@@ -496,8 +498,13 @@
 	SNDRV_CHMAP_FCH,	/* front center high */
 	SNDRV_CHMAP_FRH,	/* front right high */
 	SNDRV_CHMAP_TC,		/* top center */
-	SNDRV_CHMAP_NA,		/* N/A, silent */
-	SNDRV_CHMAP_LAST = SNDRV_CHMAP_NA,
+	SNDRV_CHMAP_TFL,	/* top front left */
+	SNDRV_CHMAP_TFR,	/* top front right */
+	SNDRV_CHMAP_TFC,	/* top front center */
+	SNDRV_CHMAP_TRL,	/* top rear left */
+	SNDRV_CHMAP_TRR,	/* top rear right */
+	SNDRV_CHMAP_TRC,	/* top rear center */
+	SNDRV_CHMAP_LAST = SNDRV_CHMAP_TRC,
 };
 
 #define SNDRV_CHMAP_POSITION_MASK	0xffff
diff --git a/sound/pci/ctxfi/ctpcm.c b/sound/pci/ctxfi/ctpcm.c
index d317107..e8a4feb 100644
--- a/sound/pci/ctxfi/ctpcm.c
+++ b/sound/pci/ctxfi/ctpcm.c
@@ -397,7 +397,7 @@
 
 static const struct snd_pcm_chmap_elem surround_map[] = {
 	{ .channels = 1,
-	  .map = { SNDRV_CHMAP_UNKNOWN } },
+	  .map = { SNDRV_CHMAP_MONO } },
 	{ .channels = 2,
 	  .map = { SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
 	{ }
@@ -405,7 +405,7 @@
 
 static const struct snd_pcm_chmap_elem clfe_map[] = {
 	{ .channels = 1,
-	  .map = { SNDRV_CHMAP_UNKNOWN } },
+	  .map = { SNDRV_CHMAP_MONO } },
 	{ .channels = 2,
 	  .map = { SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
 	{ }
@@ -413,7 +413,7 @@
 
 static const struct snd_pcm_chmap_elem side_map[] = {
 	{ .channels = 1,
-	  .map = { SNDRV_CHMAP_UNKNOWN } },
+	  .map = { SNDRV_CHMAP_MONO } },
 	{ .channels = 2,
 	  .map = { SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
 	{ }