LXR linux/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
  10static 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
  32static 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
  47static 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_stream_midi_trigger(&dice->tx_stream,
  56                                          substrm->number, substrm);
  57        else
  58                amdtp_stream_midi_trigger(&dice->tx_stream,
  59                                          substrm->number, NULL);
  60
  61        spin_unlock_irqrestore(&dice->lock, flags);
  62}
  63
  64static 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_stream_midi_trigger(&dice->rx_stream,
  73                                          substrm->number, substrm);
  74        else
  75                amdtp_stream_midi_trigger(&dice->rx_stream,
  76                                          substrm->number, NULL);
  77
  78        spin_unlock_irqrestore(&dice->lock, flags);
  79}
  80
  81static struct snd_rawmidi_ops capture_ops = {
  82        .open           = midi_open,
  83        .close          = midi_close,
  84        .trigger        = midi_capture_trigger,
  85};
  86
  87static struct snd_rawmidi_ops playback_ops = {
  88        .open           = midi_open,
  89        .close          = midi_close,
  90        .trigger        = midi_playback_trigger,
  91};
  92
  93static void set_midi_substream_names(struct snd_dice *dice,
  94                                     struct snd_rawmidi_str *str)
  95{
  96        struct snd_rawmidi_substream *subs;
  97
  98        list_for_each_entry(subs, &str->substreams, list) {
  99                snprintf(subs->name, sizeof(subs->name),
 100                         "%s MIDI %d", dice->card->shortname, subs->number + 1);
 101        }
 102}
 103
 104int snd_dice_create_midi(struct snd_dice *dice)
 105{
 106        struct snd_rawmidi *rmidi;
 107        struct snd_rawmidi_str *str;
 108        unsigned int i, midi_in_ports, midi_out_ports;
 109        int err;
 110
 111        midi_in_ports = midi_out_ports = 0;
 112        for (i = 0; i < 3; i++) {
 113                midi_in_ports = max(dice->tx_midi_ports[i], midi_in_ports);
 114                midi_out_ports = max(dice->rx_midi_ports[i], midi_out_ports);
 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}
 158