From a6a712aeb17ff30206ae1bc827d50497d884602a Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Tue, 21 Aug 2007 08:56:08 +0200 Subject: [PATCH] [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 Signed-off-by: Jaroslav Kysela --- sound/usb/usbmidi.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/sound/usb/usbmidi.c b/sound/usb/usbmidi.c index 2bb1834a8c22..4bacb50e9ad9 100644 --- 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); -- 2.20.1