The playback endpoint uses implicit feedback mode, similiar 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 --- sound/usb/pcm.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-)
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c index 37428f7..f35c5a4 100644 --- a/sound/usb/pcm.c +++ b/sound/usb/pcm.c @@ -372,6 +372,19 @@ static int set_format(struct snd_usb_substream *subs, struct audioformat *fmt) alts = &iface->altsetting[1]; goto add_sync_ep; } + break; + 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; + } }
if (((is_playback && attr == USB_ENDPOINT_SYNC_ASYNC) ||