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