sound/firewire/motu/motu-midi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * motu-midi.h - a part of driver for MOTU FireWire series
   4  *
   5  * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
   6  */
   7 #include "motu.h"
   8
   9 static int midi_open(struct snd_rawmidi_substream *substream)
  10 {
  11         struct snd_motu *motu = substream->rmidi->private_data;
  12         int err;
  13
  14         err = snd_motu_stream_lock_try(motu);
  15         if (err < 0)
  16                 return err;
  17
  18         mutex_lock(&motu->mutex);
  19
  20         err = snd_motu_stream_reserve_duplex(motu, 0, 0, 0);
  21         if (err >= 0) {
  22                 ++motu->substreams_counter;
  23                 err = snd_motu_stream_start_duplex(motu);
  24                 if (err < 0)
  25                         --motu->substreams_counter;
  26         }
  27
  28         mutex_unlock(&motu->mutex);
  29
  30         if (err < 0)
  31                 snd_motu_stream_lock_release(motu);
  32
  33         return err;
  34 }
  35
  36 static int midi_close(struct snd_rawmidi_substream *substream)
  37 {
  38         struct snd_motu *motu = substream->rmidi->private_data;
  39
  40         mutex_lock(&motu->mutex);
  41
  42         --motu->substreams_counter;
  43         snd_motu_stream_stop_duplex(motu);
  44
  45         mutex_unlock(&motu->mutex);
  46
  47         snd_motu_stream_lock_release(motu);
  48         return 0;
  49 }
  50
  51 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
  52 {
  53         struct snd_motu *motu = substrm->rmidi->private_data;
  54         unsigned long flags;
  55
  56         spin_lock_irqsave(&motu->lock, flags);
  57
  58         if (up)
  59                 amdtp_motu_midi_trigger(&motu->tx_stream, substrm->number,
  60                                         substrm);
  61         else
  62                 amdtp_motu_midi_trigger(&motu->tx_stream, substrm->number,
  63                                         NULL);
  64
  65         spin_unlock_irqrestore(&motu->lock, flags);
  66 }
  67
  68 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
  69 {
  70         struct snd_motu *motu = substrm->rmidi->private_data;
  71         unsigned long flags;
  72
  73         spin_lock_irqsave(&motu->lock, flags);
  74
  75         if (up)
  76                 amdtp_motu_midi_trigger(&motu->rx_stream, substrm->number,
  77                                         substrm);
  78         else
  79                 amdtp_motu_midi_trigger(&motu->rx_stream, substrm->number,
  80                                         NULL);
  81
  82         spin_unlock_irqrestore(&motu->lock, flags);
  83 }
  84
  85 static void set_midi_substream_names(struct snd_motu *motu,
  86                                      struct snd_rawmidi_str *str)
  87 {
  88         struct snd_rawmidi_substream *subs;
  89
  90         list_for_each_entry(subs, &str->substreams, list) {
  91                 snprintf(subs->name, sizeof(subs->name),
  92                          "%s MIDI %d", motu->card->shortname, subs->number + 1);
  93         }
  94 }
  95
  96 int snd_motu_create_midi_devices(struct snd_motu *motu)
  97 {
  98         static const struct snd_rawmidi_ops capture_ops = {
  99                 .open           = midi_open,
 100                 .close          = midi_close,
 101                 .trigger        = midi_capture_trigger,
 102         };
 103         static const struct snd_rawmidi_ops playback_ops = {
 104                 .open           = midi_open,
 105                 .close          = midi_close,
 106                 .trigger        = midi_playback_trigger,
 107         };
 108         struct snd_rawmidi *rmidi;
 109         struct snd_rawmidi_str *str;
 110         int err;
 111
 112         /* create midi ports */
 113         err = snd_rawmidi_new(motu->card, motu->card->driver, 0, 1, 1, &rmidi);
 114         if (err < 0)
 115                 return err;
 116
 117         snprintf(rmidi->name, sizeof(rmidi->name),
 118                  "%s MIDI", motu->card->shortname);
 119         rmidi->private_data = motu;
 120
 121         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT |
 122                              SNDRV_RAWMIDI_INFO_OUTPUT |
 123                              SNDRV_RAWMIDI_INFO_DUPLEX;
 124
 125         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 126                             &capture_ops);
 127         str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
 128         set_midi_substream_names(motu, str);
 129
 130         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 131                             &playback_ops);
 132         str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
 133         set_midi_substream_names(motu, str);
 134
 135         return 0;
 136 }