ALSA: usb-audio: FT C400 sync playback EP to capture EP (ca10a7eb) · Commits · 戴 / test

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>

sound/usb/pcm.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -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) {

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