sound/usb/caiaq/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/init.h>
  20 #include <linux/module.h>
  21 #include <linux/moduleparam.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/usb.h>
  24 #include <linux/input.h>
  25 #include <linux/spinlock.h>
  26 #include <sound/driver.h>
  27 #include <sound/core.h>
  28 #include <sound/rawmidi.h>
  29 #include <sound/pcm.h>
  30
  31 #include "caiaq-device.h"
  32 #include "caiaq-midi.h"
  33
  34
  35 static int snd_usb_caiaq_midi_input_open(struct snd_rawmidi_substream *substream)
  36 {
  37         return 0;
  38 }
  39
  40 static int snd_usb_caiaq_midi_input_close(struct snd_rawmidi_substream *substream)
  41 {
  42         return 0;
  43 }
  44
  45 static void snd_usb_caiaq_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
  46 {
  47         struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
  48
  49         if (!dev)
  50                 return;
  51
  52         dev->midi_receive_substream = up ? substream : NULL;
  53 }
  54
  55
  56 static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substream)
  57 {
  58         return 0;
  59 }
  60
  61 static int snd_usb_caiaq_midi_output_close(struct snd_rawmidi_substream *substream)
  62 {
  63         return 0;
  64 }
  65
  66 static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *dev,
  67                                     struct snd_rawmidi_substream *substream)
  68 {
  69         int len, ret;
  70
  71         dev->midi_out_buf[0] = EP1_CMD_MIDI_WRITE;
  72         dev->midi_out_buf[1] = 0; /* port */
  73         len = snd_rawmidi_transmit_peek(substream, dev->midi_out_buf+3, EP1_BUFSIZE-3);
  74
  75         if (len <= 0)
  76                 return;
  77
  78         dev->midi_out_buf[2] = len;
  79         dev->midi_out_urb.transfer_buffer_length = len+3;
  80
  81         ret = usb_submit_urb(&dev->midi_out_urb, GFP_ATOMIC);
  82         if (ret < 0)
  83                 log("snd_usb_caiaq_midi_send(%p): usb_submit_urb() failed, %d\n",
  84                                 substream, ret);
  85 }
  86
  87 static void snd_usb_caiaq_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
  88 {
  89         struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
  90
  91         if (dev->midi_out_substream != NULL)
  92                 return;
  93
  94         if (!up) {
  95                 dev->midi_out_substream = NULL;
  96                 return;
  97         }
  98
  99         dev->midi_out_substream = substream;
 100         snd_usb_caiaq_midi_send(dev, substream);
 101 }
 102
 103
 104 static struct snd_rawmidi_ops snd_usb_caiaq_midi_output =
 105 {
 106         .open =         snd_usb_caiaq_midi_output_open,
 107         .close =        snd_usb_caiaq_midi_output_close,
 108         .trigger =      snd_usb_caiaq_midi_output_trigger,
 109 };
 110
 111 static struct snd_rawmidi_ops snd_usb_caiaq_midi_input =
 112 {
 113         .open =         snd_usb_caiaq_midi_input_open,
 114         .close =        snd_usb_caiaq_midi_input_close,
 115         .trigger =      snd_usb_caiaq_midi_input_trigger,
 116 };
 117
 118 void snd_usb_caiaq_midi_handle_input(struct snd_usb_caiaqdev *dev,
 119                                      int port, const char *buf, int len)
 120 {
 121         if (!dev->midi_receive_substream)
 122                 return;
 123
 124         snd_rawmidi_receive(dev->midi_receive_substream, buf, len);
 125 }
 126
 127 int __devinit snd_usb_caiaq_midi_init(struct snd_usb_caiaqdev *device)
 128 {
 129         int ret;
 130         struct snd_rawmidi *rmidi;
 131
 132         ret = snd_rawmidi_new(device->chip.card, device->product_name, 0,
 133                                         device->spec.num_midi_out,
 134                                         device->spec.num_midi_in,
 135                                         &rmidi);
 136
 137         if (ret < 0)
 138                 return ret;
 139
 140         strcpy(rmidi->name, device->product_name);
 141
 142         rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX;
 143         rmidi->private_data = device;
 144
 145         if (device->spec.num_midi_out > 0) {
 146                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 147                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 148                                     &snd_usb_caiaq_midi_output);
 149         }
 150
 151         if (device->spec.num_midi_in > 0) {
 152                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 153                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 154                                     &snd_usb_caiaq_midi_input);
 155         }
 156
 157         device->rmidi = rmidi;
 158
 159         return 0;
 160 }
 161
 162 void snd_usb_caiaq_midi_output_done(struct urb* urb)
 163 {
 164         struct snd_usb_caiaqdev *dev = urb->context;
 165         char *buf = urb->transfer_buffer;
 166
 167         if (urb->status != 0)
 168                 return;
 169
 170         if (!dev->midi_out_substream)
 171                 return;
 172
 173         snd_rawmidi_transmit_ack(dev->midi_out_substream, buf[2]);
 174         dev->midi_out_substream = NULL;
 175         snd_usb_caiaq_midi_send(dev, dev->midi_out_substream);
 176 }
 177