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/core.h>
  27 #include <sound/rawmidi.h>
  28 #include <sound/pcm.h>
  29
  30 #include "caiaq-device.h"
  31 #include "caiaq-midi.h"
  32
  33
  34 static int snd_usb_caiaq_midi_input_open(struct snd_rawmidi_substream *substream)
  35 {
  36         return 0;
  37 }
  38
  39 static int snd_usb_caiaq_midi_input_close(struct snd_rawmidi_substream *substream)
  40 {
  41         return 0;
  42 }
  43
  44 static void snd_usb_caiaq_midi_input_trigger(struct snd_rawmidi_substream *substream, int up)
  45 {
  46         struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
  47
  48         if (!dev)
  49                 return;
  50
  51         dev->midi_receive_substream = up ? substream : NULL;
  52 }
  53
  54
  55 static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substream)
  56 {
  57         return 0;
  58 }
  59
  60 static int snd_usb_caiaq_midi_output_close(struct snd_rawmidi_substream *substream)
  61 {
  62         struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
  63         if (dev->midi_out_active) {
  64                 usb_kill_urb(&dev->midi_out_urb);
  65                 dev->midi_out_active = 0;
  66         }
  67         return 0;
  68 }
  69
  70 static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *dev,
  71                                     struct snd_rawmidi_substream *substream)
  72 {
  73         int len, ret;
  74
  75         dev->midi_out_buf[0] = EP1_CMD_MIDI_WRITE;
  76         dev->midi_out_buf[1] = 0; /* port */
  77         len = snd_rawmidi_transmit(substream, dev->midi_out_buf + 3,
  78                                    EP1_BUFSIZE - 3);
  79
  80         if (len <= 0)
  81                 return;
  82
  83         dev->midi_out_buf[2] = len;
  84         dev->midi_out_urb.transfer_buffer_length = len+3;
  85
  86         ret = usb_submit_urb(&dev->midi_out_urb, GFP_ATOMIC);
  87         if (ret < 0)
  88                 log("snd_usb_caiaq_midi_send(%p): usb_submit_urb() failed,"
  89                     "ret=%d, len=%d\n",
  90                     substream, ret, len);
  91         else
  92                 dev->midi_out_active = 1;
  93 }
  94
  95 static void snd_usb_caiaq_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
  96 {
  97         struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
  98
  99         if (up) {
 100                 dev->midi_out_substream = substream;
 101                 if (!dev->midi_out_active)
 102                         snd_usb_caiaq_midi_send(dev, substream);
 103         } else {
 104                 dev->midi_out_substream = NULL;
 105         }
 106 }
 107
 108
 109 static struct snd_rawmidi_ops snd_usb_caiaq_midi_output =
 110 {
 111         .open =         snd_usb_caiaq_midi_output_open,
 112         .close =        snd_usb_caiaq_midi_output_close,
 113         .trigger =      snd_usb_caiaq_midi_output_trigger,
 114 };
 115
 116 static struct snd_rawmidi_ops snd_usb_caiaq_midi_input =
 117 {
 118         .open =         snd_usb_caiaq_midi_input_open,
 119         .close =        snd_usb_caiaq_midi_input_close,
 120         .trigger =      snd_usb_caiaq_midi_input_trigger,
 121 };
 122
 123 void snd_usb_caiaq_midi_handle_input(struct snd_usb_caiaqdev *dev,
 124                                      int port, const char *buf, int len)
 125 {
 126         if (!dev->midi_receive_substream)
 127                 return;
 128
 129         snd_rawmidi_receive(dev->midi_receive_substream, buf, len);
 130 }
 131
 132 int snd_usb_caiaq_midi_init(struct snd_usb_caiaqdev *device)
 133 {
 134         int ret;
 135         struct snd_rawmidi *rmidi;
 136
 137         ret = snd_rawmidi_new(device->chip.card, device->product_name, 0,
 138                                         device->spec.num_midi_out,
 139                                         device->spec.num_midi_in,
 140                                         &rmidi);
 141
 142         if (ret < 0)
 143                 return ret;
 144
 145         strcpy(rmidi->name, device->product_name);
 146
 147         rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX;
 148         rmidi->private_data = device;
 149
 150         if (device->spec.num_midi_out > 0) {
 151                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 152                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 153                                     &snd_usb_caiaq_midi_output);
 154         }
 155
 156         if (device->spec.num_midi_in > 0) {
 157                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 158                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 159                                     &snd_usb_caiaq_midi_input);
 160         }
 161
 162         device->rmidi = rmidi;
 163
 164         return 0;
 165 }
 166
 167 void snd_usb_caiaq_midi_output_done(struct urb* urb)
 168 {
 169         struct snd_usb_caiaqdev *dev = urb->context;
 170
 171         dev->midi_out_active = 0;
 172         if (urb->status != 0)
 173                 return;
 174
 175         if (!dev->midi_out_substream)
 176                 return;
 177
 178         snd_usb_caiaq_midi_send(dev, dev->midi_out_substream);
 179 }
 180