[ALSA] usb-audio - Fix AC3 with M-Audio Audiophile USB

Fixed AC3 interface in device_setup=0x00 mode thanks to Hakan
Lennestal and updated documentation

Signed-off-by: Thibault Le Meur <Thibault.LeMeur@supelec.fr>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 12 insertions, 1 deletions

diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 834b0aff5ec1..7bd5852fcc0d 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -2532,7 +2532,18 @@ static int parse_audio_format_i(struct snd_usb_audio *chip, struct audioformat *
                  *        but we give normal PCM format to get the existing
                  *        apps working...
                  */
-                pcm_format = SNDRV_PCM_FORMAT_S16_LE;
+                switch (chip->usb_id) {
+
+                case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
+                        if (device_setup[chip->index] == 0x00 && 
+                            fp->altsetting == 6)
+                                pcm_format = SNDRV_PCM_FORMAT_S16_BE;
+                        else
+                                pcm_format = SNDRV_PCM_FORMAT_S16_LE;
+                        break;
+                default:
+                        pcm_format = SNDRV_PCM_FORMAT_S16_LE;
+                }
         } else {
                 pcm_format = parse_audio_format_i_type(chip, fp, format, fmt);
                 if (pcm_format < 0)