linux/sound/usb/caiaq/caiaq-midi.c
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   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
  34static int snd_usb_caiaq_midi_input_open(struct snd_rawmidi_substream *substream)
  35{
  36        return 0;
  37}
  38
  39static int snd_usb_caiaq_midi_input_close(struct snd_rawmidi_substream *substream)
  40{
  41        return 0;
  42}
  43
  44static 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
  55static int snd_usb_caiaq_midi_output_open(struct snd_rawmidi_substream *substream)
  56{
  57        return 0;
  58}
  59
  60static 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
  70static 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
  95static 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
 109static 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
 116static 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
 123void 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
 132int 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
 167void 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
 181