ALSA: usb-audio: FT C400 sync playback EP to capture EP

The playback endpoint uses implicit feedback mode, similar
to the M-Audio FTU. Like with the FTU, we need to associate
the sync pipe ourselves.

Signed-off-by: Eldad Zack <eldad@fogrefinery.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 13 insertions, 0 deletions

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index f488a493a98e..769821c30031 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -362,6 +362,19 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt)
         attr = fmt->ep_attr & USB_ENDPOINT_SYNCTYPE;
 
         switch (subs->stream->chip->usb_id) {
+        case USB_ID(0x0763, 0x2030): /* M-Audio Fast Track C400 */
+                if (is_playback) {
+                        implicit_fb = 1;
+                        ep = 0x81;
+                        iface = usb_ifnum_to_if(dev, 3);
+
+                        if (!iface || iface->num_altsetting == 0)
+                                return -EINVAL;
+
+                        alts = &iface->altsetting[1];
+                        goto add_sync_ep;
+                }
+                break;
         case USB_ID(0x0763, 0x2080): /* M-Audio FastTrack Ultra */
         case USB_ID(0x0763, 0x2081):
                 if (is_playback) {