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         return 0;
  63 }
  64
  65 static void snd_usb_caiaq_midi_send(struct snd_usb_caiaqdev *dev,
  66                                     struct snd_rawmidi_substream *substream)
  67 {
  68         int len, ret;
  69
  70         dev->midi_out_buf[0] = EP1_CMD_MIDI_WRITE;
  71         dev->midi_out_buf[1] = 0; /* port */
  72         len = snd_rawmidi_transmit_peek(substream, dev->midi_out_buf+3, 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, %d\n",
  83                                 substream, ret);
  84 }
  85
  86 static void snd_usb_caiaq_midi_output_trigger(struct snd_rawmidi_substream *substream, int up)
  87 {
  88         struct snd_usb_caiaqdev *dev = substream->rmidi->private_data;
  89
  90         if (dev->midi_out_substream != NULL)
  91                 return;
  92
  93         if (!up) {
  94                 dev->midi_out_substream = NULL;
  95                 return;
  96         }
  97
  98         dev->midi_out_substream = substream;
  99         snd_usb_caiaq_midi_send(dev, substream);
 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         strcpy(rmidi->name, device->product_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         char *buf = urb->transfer_buffer;
 165
 166         if (urb->status != 0)
 167                 return;
 168
 169         if (!dev->midi_out_substream)
 170                 return;
 171
 172         snd_rawmidi_transmit_ack(dev->midi_out_substream, buf[2]);
 173         dev->midi_out_substream = NULL;
 174         snd_usb_caiaq_midi_send(dev, dev->midi_out_substream);
 175 }
 176