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