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
  27 static int snd_usb_caiaq_midi_input_open(struct snd_rawmidi_substream *substream)
  28 {
  29         return 0;
  30 }
  31
  32 static int snd_usb_caiaq_midi_input_close(struct snd_rawmidi_substream *substream)
  33 {
  34         return 0;
  35 }
  36
  37 static 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
  48 static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substream)
  49 {
  50         return 0;
  51 }
  52
  53 static 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
  63 static 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
  88 static 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
 102 static 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
 109 static 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
 116 void 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
 125 int 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
 160 void 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