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* Copyright (c) 2006,2007 Daniel Mack
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <linux/usb.h>
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#include <linux/gfp.h>
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#include <sound/rawmidi.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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static int snd_usb_caiaq_midi_input_open(struct snd_rawmidi_substream *substream)
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static int snd_usb_caiaq_midi_input_close(struct snd_rawmidi_substream *substream)
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static void snd_usb_caiaq_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
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struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
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dev->midi_receive_substream = up ? substream : NULL;
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static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substream)
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static int snd_usb_caiaq_midi_output_close(struct snd_rawmidi_substream *substream)
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struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
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if (dev->midi_out_active) {
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usb_kill_urb(&dev->midi_out_urb);
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dev->midi_out_active = 0;
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static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *dev,
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struct snd_rawmidi_substream *substream)
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dev->midi_out_buf[0] = EP1_CMD_MIDI_WRITE;
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dev->midi_out_buf[1] = 0; /* port */
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len = snd_rawmidi_transmit(substream, dev->midi_out_buf + 3,
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dev->midi_out_buf[2] = len;
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dev->midi_out_urb.transfer_buffer_length = len+3;
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ret = usb_submit_urb(&dev->midi_out_urb, GFP_ATOMIC);
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log("snd_usb_caiaq_midi_send(%p): usb_submit_urb() failed,"
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dev->midi_out_active = 1;
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static void snd_usb_caiaq_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
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struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
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dev->midi_out_substream = substream;
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if (!dev->midi_out_active)
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snd_usb_caiaq_midi_send(dev, substream);
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dev->midi_out_substream = NULL;
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static struct snd_rawmidi_ops snd_usb_caiaq_midi_output =
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.open = snd_usb_caiaq_midi_output_open,
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.close = snd_usb_caiaq_midi_output_close,
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.trigger = snd_usb_caiaq_midi_output_trigger,
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static struct snd_rawmidi_ops snd_usb_caiaq_midi_input =
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.open = snd_usb_caiaq_midi_input_open,
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.close = snd_usb_caiaq_midi_input_close,
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.trigger = snd_usb_caiaq_midi_input_trigger,
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void snd_usb_caiaq_midi_handle_input(struct snd_usb_caiaqdev *dev,
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int port, const char *buf, int len)
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if (!dev->midi_receive_substream)
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snd_rawmidi_receive(dev->midi_receive_substream, buf, len);
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int snd_usb_caiaq_midi_init(struct snd_usb_caiaqdev *device)
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struct snd_rawmidi *rmidi;
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ret = snd_rawmidi_new(device->chip.card, device->product_name, 0,
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device->spec.num_midi_out,
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device->spec.num_midi_in,
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strcpy(rmidi->name, device->product_name);
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rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX;
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rmidi->private_data = device;
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if (device->spec.num_midi_out > 0) {
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
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&snd_usb_caiaq_midi_output);
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if (device->spec.num_midi_in > 0) {
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rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
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snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
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&snd_usb_caiaq_midi_input);
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device->rmidi = rmidi;
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void snd_usb_caiaq_midi_output_done(struct urb* urb)
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struct snd_usb_caiaqdev *dev = urb->context;
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dev->midi_out_active = 0;
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if (urb->status != 0)
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if (!dev->midi_out_substream)
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snd_usb_caiaq_midi_send(dev, dev->midi_out_substream);