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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>
This commit is contained in:
Eldad Zack 2012-11-28 23:55:41 +01:00 committed by Takashi Iwai
parent 09d8e3a71d
commit ca10a7ebdf
1 changed files with 13 additions and 0 deletions
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13
sound/usb/pcm.c
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@ -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) {