ALSA: usb-audio: ADC3: Fix channel mapping conversion for ADC3.

The channel mapping is defined by bChRelationship, not bChPurpose.

Fixes: 9a2fe9b801f5 ("ALSA: usb: initial USB Audio Device Class 3.0 support")
Reviewed-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Signed-off-by: Michael Drake <michael.drake@codethink.co.uk>
Signed-off-by: Jorge Sanjuan <jorge.sanjuan@codethink.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 6a8f584..956be9f 100644 (file)
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -349,7 +349,7 @@ snd_pcm_chmap_elem *convert_chmap_v3(struct uac3_cluster_header_descriptor
                         * TODO: this conversion is not complete, update it
                         * after adding UAC3 values to asound.h
                         */
-                       switch (is->bChPurpose) {
+                       switch (is->bChRelationship) {
                        case UAC3_CH_MONO:
                                map = SNDRV_CHMAP_MONO;
                                break;