LXR linux/sound/usb/caiaq/midi.c

   1/*
   2 *   Copyright (c) 2006,2007 Daniel Mack
   3 *
   4 *   This program is free software; you can redistribute it and/or modify
   5 *   it under the terms of the GNU General Public License as published by
   6 *   the Free Software Foundation; either version 2 of the License, or
   7 *   (at your option) any later version.
   8 *
   9 *   This program is distributed in the hope that it will be useful,
  10 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 *   GNU General Public License for more details.
  13 *
  14 *   You should have received a copy of the GNU General Public License
  15 *   along with this program; if not, write to the Free Software
  16 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  17*/
  18
  19#include <linux/usb.h>
  20#include <sound/rawmidi.h>
  21#include <sound/core.h>
  22#include <sound/pcm.h>
  23
  24#include "device.h"
  25#include "midi.h"
  26
  27static int snd_usb_caiaq_midi_input_open(struct snd_rawmidi_substream *substream)
  28{
  29        return 0;
  30}
  31
  32static int snd_usb_caiaq_midi_input_close(struct snd_rawmidi_substream *substream)
  33{
  34        return 0;
  35}
  36
  37static void snd_usb_caiaq_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
  38{
  39        struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
  40
  41        if (!dev)
  42                return;
  43
  44        dev->midi_receive_substream = up ? substream : NULL;
  45}
  46
  47
  48static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substream)
  49{
  50        return 0;
  51}
  52
  53static int snd_usb_caiaq_midi_output_close(struct snd_rawmidi_substream *substream)
  54{
  55        struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
  56        if (dev->midi_out_active) {
  57                usb_kill_urb(&dev->midi_out_urb);
  58                dev->midi_out_active = 0;
  59        }
  60        return 0;
  61}
  62
  63static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *dev,
  64                                    struct snd_rawmidi_substream *substream)
  65{
  66        int len, ret;
  67
  68        dev->midi_out_buf[0] = EP1_CMD_MIDI_WRITE;
  69        dev->midi_out_buf[1] = 0; /* port */
  70        len = snd_rawmidi_transmit(substream, dev->midi_out_buf + 3,
  71                                   EP1_BUFSIZE - 3);
  72
  73        if (len <= 0)
  74                return;
  75
  76        dev->midi_out_buf[2] = len;
  77        dev->midi_out_urb.transfer_buffer_length = len+3;
  78
  79        ret = usb_submit_urb(&dev->midi_out_urb, GFP_ATOMIC);
  80        if (ret < 0)
  81                log("snd_usb_caiaq_midi_send(%p): usb_submit_urb() failed,"
  82                    "ret=%d, len=%d\n",
  83                    substream, ret, len);
  84        else
  85                dev->midi_out_active = 1;
  86}
  87
  88static void snd_usb_caiaq_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
  89{
  90        struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
  91
  92        if (up) {
  93                dev->midi_out_substream = substream;
  94                if (!dev->midi_out_active)
  95                        snd_usb_caiaq_midi_send(dev, substream);
  96        } else {
  97                dev->midi_out_substream = NULL;
  98        }
  99}
 100
 101
 102static struct snd_rawmidi_ops snd_usb_caiaq_midi_output =
 103{
 104        .open =         snd_usb_caiaq_midi_output_open,
 105        .close =        snd_usb_caiaq_midi_output_close,
 106        .trigger =      snd_usb_caiaq_midi_output_trigger,
 107};
 108
 109static struct snd_rawmidi_ops snd_usb_caiaq_midi_input =
 110{
 111        .open =         snd_usb_caiaq_midi_input_open,
 112        .close =        snd_usb_caiaq_midi_input_close,
 113        .trigger =      snd_usb_caiaq_midi_input_trigger,
 114};
 115
 116void snd_usb_caiaq_midi_handle_input(struct snd_usb_caiaqdev *dev,
 117                                     int port, const char *buf, int len)
 118{
 119        if (!dev->midi_receive_substream)
 120                return;
 121
 122        snd_rawmidi_receive(dev->midi_receive_substream, buf, len);
 123}
 124
 125int snd_usb_caiaq_midi_init(struct snd_usb_caiaqdev *device)
 126{
 127        int ret;
 128        struct snd_rawmidi *rmidi;
 129
 130        ret = snd_rawmidi_new(device->chip.card, device->product_name, 0,
 131                                        device->spec.num_midi_out,
 132                                        device->spec.num_midi_in,
 133                                        &rmidi);
 134
 135        if (ret < 0)
 136                return ret;
 137
 138        strcpy(rmidi->name, device->product_name);
 139
 140        rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX;
 141        rmidi->private_data = device;
 142
 143        if (device->spec.num_midi_out > 0) {
 144                rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 145                snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 146                                    &snd_usb_caiaq_midi_output);
 147        }
 148
 149        if (device->spec.num_midi_in > 0) {
 150                rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 151                snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 152                                    &snd_usb_caiaq_midi_input);
 153        }
 154
 155        device->rmidi = rmidi;
 156
 157        return 0;
 158}
 159
 160void snd_usb_caiaq_midi_output_done(struct urb* urb)
 161{
 162        struct snd_usb_caiaqdev *dev = urb->context;
 163
 164        dev->midi_out_active = 0;
 165        if (urb->status != 0)
 166                return;
 167
 168        if (!dev->midi_out_substream)
 169                return;
 170
 171        snd_usb_caiaq_midi_send(dev, dev->midi_out_substream);
 172}
 173
 174