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[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>
This commit is contained in:
Clemens Ladisch 2007-08-21 08:56:08 +02:00 committed by Jaroslav Kysela
parent d53d7d9e5e
commit a6a712aeb1
1 changed files with 12 additions and 4 deletions
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16
sound/usb/usbmidi.c
View File

@ -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);