sound/firewire/fireface/ff-midi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ff-midi.c - a part of driver for RME Fireface series
   4  *
   5  * Copyright (c) 2015-2017 Takashi Sakamoto
   6  */
   7
   8 #include "ff.h"
   9
  10 static int midi_capture_open(struct snd_rawmidi_substream *substream)
  11 {
  12         /* Do nothing. */
  13         return 0;
  14 }
  15
  16 static int midi_playback_open(struct snd_rawmidi_substream *substream)
  17 {
  18         struct snd_ff *ff = substream->rmidi->private_data;
  19
  20         /* Initialize internal status. */
  21         ff->on_sysex[substream->number] = 0;
  22         ff->rx_midi_error[substream->number] = false;
  23
  24         WRITE_ONCE(ff->rx_midi_substreams[substream->number], substream);
  25
  26         return 0;
  27 }
  28
  29 static int midi_capture_close(struct snd_rawmidi_substream *substream)
  30 {
  31         /* Do nothing. */
  32         return 0;
  33 }
  34
  35 static int midi_playback_close(struct snd_rawmidi_substream *substream)
  36 {
  37         struct snd_ff *ff = substream->rmidi->private_data;
  38
  39         cancel_work_sync(&ff->rx_midi_work[substream->number]);
  40         WRITE_ONCE(ff->rx_midi_substreams[substream->number], NULL);
  41
  42         return 0;
  43 }
  44
  45 static void midi_capture_trigger(struct snd_rawmidi_substream *substream,
  46                                  int up)
  47 {
  48         struct snd_ff *ff = substream->rmidi->private_data;
  49         unsigned long flags;
  50
  51         spin_lock_irqsave(&ff->lock, flags);
  52
  53         if (up)
  54                 WRITE_ONCE(ff->tx_midi_substreams[substream->number],
  55                            substream);
  56         else
  57                 WRITE_ONCE(ff->tx_midi_substreams[substream->number], NULL);
  58
  59         spin_unlock_irqrestore(&ff->lock, flags);
  60 }
  61
  62 static void midi_playback_trigger(struct snd_rawmidi_substream *substream,
  63                                   int up)
  64 {
  65         struct snd_ff *ff = substream->rmidi->private_data;
  66         unsigned long flags;
  67
  68         spin_lock_irqsave(&ff->lock, flags);
  69
  70         if (up || !ff->rx_midi_error[substream->number])
  71                 schedule_work(&ff->rx_midi_work[substream->number]);
  72
  73         spin_unlock_irqrestore(&ff->lock, flags);
  74 }
  75
  76 static void set_midi_substream_names(struct snd_rawmidi_str *stream,
  77                                      const char *const name)
  78 {
  79         struct snd_rawmidi_substream *substream;
  80
  81         list_for_each_entry(substream, &stream->substreams, list) {
  82                 snprintf(substream->name, sizeof(substream->name),
  83                          "%s MIDI %d", name, substream->number + 1);
  84         }
  85 }
  86
  87 int snd_ff_create_midi_devices(struct snd_ff *ff)
  88 {
  89         static const struct snd_rawmidi_ops midi_capture_ops = {
  90                 .open           = midi_capture_open,
  91                 .close          = midi_capture_close,
  92                 .trigger        = midi_capture_trigger,
  93         };
  94         static const struct snd_rawmidi_ops midi_playback_ops = {
  95                 .open           = midi_playback_open,
  96                 .close          = midi_playback_close,
  97                 .trigger        = midi_playback_trigger,
  98         };
  99         struct snd_rawmidi *rmidi;
 100         struct snd_rawmidi_str *stream;
 101         int err;
 102
 103         err = snd_rawmidi_new(ff->card, ff->card->driver, 0,
 104                               ff->spec->midi_out_ports, ff->spec->midi_in_ports,
 105                               &rmidi);
 106         if (err < 0)
 107                 return err;
 108
 109         snprintf(rmidi->name, sizeof(rmidi->name),
 110                  "%s MIDI", ff->card->shortname);
 111         rmidi->private_data = ff;
 112
 113         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 114         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 115                             &midi_capture_ops);
 116         stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
 117         set_midi_substream_names(stream, ff->card->shortname);
 118
 119         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 120         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 121                             &midi_playback_ops);
 122         stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
 123         set_midi_substream_names(stream, ff->card->shortname);
 124
 125         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 126
 127         return 0;
 128 }