[006/272] ALSA: snd-usb-us122l: Fix MIDI output

Greg KH
2011-02-16T02:19:41Z

From: Karsten Wiese <fzu@wemgehoertderstaat.de>

commit 921eebdc18c82268eab446592191b39e35d031d6 upstream.

The US-122L always reads 9 bytes per urb unless they are set to 0xFD.

Signed-off-by: Karsten Wiese <fzu@wemgehoertderstaat.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
sound/usb/midi.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)

--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -850,8 +850,8 @@ static void snd_usbmidi_us122l_output(st
return;
}

- memset(urb->transfer_buffer + count, 0xFD, 9 - count);
- urb->transfer_buffer_length = count;
+ memset(urb->transfer_buffer + count, 0xFD, ep->max_transfer - count);
+ urb->transfer_buffer_length = ep->max_transfer;
}

static struct usb_protocol_ops snd_usbmidi_122l_ops = {
@@ -1295,6 +1295,13 @@ static int snd_usbmidi_out_endpoint_crea
case USB_ID(0x1a86, 0x752d): /* QinHeng CH345 "USB2.0-MIDI" */
ep->max_transfer = 4;
break;
+ /*
+ * Some devices only work with 9 bytes packet size:
+ */
+ case USB_ID(0x0644, 0x800E): /* Tascam US-122L */
+ case USB_ID(0x0644, 0x800F): /* Tascam US-144 */
+ ep->max_transfer = 9;
+ break;
}
for (i = 0; i < OUTPUT_URBS; ++i) {
buffer = usb_alloc_coherent(umidi->dev,