sound/firewire/dice/dice-midi.c

   1 /*
   2  * dice_midi.c - a part of driver for Dice based devices
   3  *
   4  * Copyright (c) 2014 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8 #include "dice.h"
   9
  10 static int midi_open(struct snd_rawmidi_substream *substream)
  11 {
  12         struct snd_dice *dice = substream->rmidi->private_data;
  13         int err;
  14
  15         err = snd_dice_stream_lock_try(dice);
  16         if (err < 0)
  17                 return err;
  18
  19         mutex_lock(&dice->mutex);
  20
  21         dice->substreams_counter++;
  22         err = snd_dice_stream_start_duplex(dice, 0);
  23
  24         mutex_unlock(&dice->mutex);
  25
  26         if (err < 0)
  27                 snd_dice_stream_lock_release(dice);
  28
  29         return err;
  30 }
  31
  32 static int midi_close(struct snd_rawmidi_substream *substream)
  33 {
  34         struct snd_dice *dice = substream->rmidi->private_data;
  35
  36         mutex_lock(&dice->mutex);
  37
  38         dice->substreams_counter--;
  39         snd_dice_stream_stop_duplex(dice);
  40
  41         mutex_unlock(&dice->mutex);
  42
  43         snd_dice_stream_lock_release(dice);
  44         return 0;
  45 }
  46
  47 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
  48 {
  49         struct snd_dice *dice = substrm->rmidi->private_data;
  50         unsigned long flags;
  51
  52         spin_lock_irqsave(&dice->lock, flags);
  53
  54         if (up)
  55                 amdtp_am824_midi_trigger(&dice->tx_stream[0],
  56                                           substrm->number, substrm);
  57         else
  58                 amdtp_am824_midi_trigger(&dice->tx_stream[0],
  59                                           substrm->number, NULL);
  60
  61         spin_unlock_irqrestore(&dice->lock, flags);
  62 }
  63
  64 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
  65 {
  66         struct snd_dice *dice = substrm->rmidi->private_data;
  67         unsigned long flags;
  68
  69         spin_lock_irqsave(&dice->lock, flags);
  70
  71         if (up)
  72                 amdtp_am824_midi_trigger(&dice->rx_stream[0],
  73                                          substrm->number, substrm);
  74         else
  75                 amdtp_am824_midi_trigger(&dice->rx_stream[0],
  76                                          substrm->number, NULL);
  77
  78         spin_unlock_irqrestore(&dice->lock, flags);
  79 }
  80
  81 static void set_midi_substream_names(struct snd_dice *dice,
  82                                      struct snd_rawmidi_str *str)
  83 {
  84         struct snd_rawmidi_substream *subs;
  85
  86         list_for_each_entry(subs, &str->substreams, list) {
  87                 snprintf(subs->name, sizeof(subs->name),
  88                          "%s MIDI %d", dice->card->shortname, subs->number + 1);
  89         }
  90 }
  91
  92 int snd_dice_create_midi(struct snd_dice *dice)
  93 {
  94         static const struct snd_rawmidi_ops capture_ops = {
  95                 .open           = midi_open,
  96                 .close          = midi_close,
  97                 .trigger        = midi_capture_trigger,
  98         };
  99         static const struct snd_rawmidi_ops playback_ops = {
 100                 .open           = midi_open,
 101                 .close          = midi_close,
 102                 .trigger        = midi_playback_trigger,
 103         };
 104         struct snd_rawmidi *rmidi;
 105         struct snd_rawmidi_str *str;
 106         unsigned int midi_in_ports, midi_out_ports;
 107         int i;
 108         int err;
 109
 110         midi_in_ports = 0;
 111         midi_out_ports = 0;
 112         for (i = 0; i < MAX_STREAMS; ++i) {
 113                 midi_in_ports = max(midi_in_ports, dice->tx_midi_ports[i]);
 114                 midi_out_ports = max(midi_out_ports, dice->rx_midi_ports[i]);
 115         }
 116
 117         if (midi_in_ports + midi_out_ports == 0)
 118                 return 0;
 119
 120         /* create midi ports */
 121         err = snd_rawmidi_new(dice->card, dice->card->driver, 0,
 122                               midi_out_ports, midi_in_ports,
 123                               &rmidi);
 124         if (err < 0)
 125                 return err;
 126
 127         snprintf(rmidi->name, sizeof(rmidi->name),
 128                  "%s MIDI", dice->card->shortname);
 129         rmidi->private_data = dice;
 130
 131         if (midi_in_ports > 0) {
 132                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 133
 134                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 135                                     &capture_ops);
 136
 137                 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
 138
 139                 set_midi_substream_names(dice, str);
 140         }
 141
 142         if (midi_out_ports > 0) {
 143                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 144
 145                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 146                                     &playback_ops);
 147
 148                 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
 149
 150                 set_midi_substream_names(dice, str);
 151         }
 152
 153         if ((midi_out_ports > 0) && (midi_in_ports > 0))
 154                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 155
 156         return 0;
 157 }