[ALSA] usb-audio: allow output interrupt transfers for MIDI

Allow output interrupt transfers for some MIDI devices that require
them.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c
index 2bb1834..4bacb50 100644 (file)
--- a/sound/usb/usbmidi.c
+++ b/sound/usb/usbmidi.c
@@ -983,8 +983,10 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi,
                snd_usbmidi_out_endpoint_delete(ep);
                return -ENOMEM;
        }
-       /* we never use interrupt output pipes */
-       pipe = usb_sndbulkpipe(umidi->chip->dev, ep_info->out_ep);
+       if (ep_info->out_interval)
+               pipe = usb_sndintpipe(umidi->chip->dev, ep_info->out_ep);
+       else
+               pipe = usb_sndbulkpipe(umidi->chip->dev, ep_info->out_ep);
        if (umidi->chip->usb_id == USB_ID(0x0a92, 0x1020)) /* ESI M4U */
                /* FIXME: we need more URBs to get reasonable bandwidth here: */
                ep->max_transfer = 4;
@@ -996,8 +998,14 @@ static int snd_usbmidi_out_endpoint_create(struct snd_usb_midi* umidi,
                snd_usbmidi_out_endpoint_delete(ep);
                return -ENOMEM;
        }
-       usb_fill_bulk_urb(ep->urb, umidi->chip->dev, pipe, buffer,
-                         ep->max_transfer, snd_usbmidi_out_urb_complete, ep);
+       if (ep_info->out_interval)
+               usb_fill_int_urb(ep->urb, umidi->chip->dev, pipe, buffer,
+                                ep->max_transfer, snd_usbmidi_out_urb_complete,
+                                ep, ep_info->out_interval);
+       else
+               usb_fill_bulk_urb(ep->urb, umidi->chip->dev,
+                                 pipe, buffer, ep->max_transfer,
+                                 snd_usbmidi_out_urb_complete, ep);
        ep->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 
        spin_lock_init(&ep->buffer_lock);