sound/firewire/fireface/ff-midi.c

   1 /*
   2  * ff-midi.c - a part of driver for RME Fireface series
   3  *
   4  * Copyright (c) 2015-2017 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8
   9 #include "ff.h"
  10
  11 static int midi_capture_open(struct snd_rawmidi_substream *substream)
  12 {
  13         /* Do nothing. */
  14         return 0;
  15 }
  16
  17 static int midi_playback_open(struct snd_rawmidi_substream *substream)
  18 {
  19         struct snd_ff *ff = substream->rmidi->private_data;
  20
  21         /* Initialize internal status. */
  22         ff->running_status[substream->number] = 0;
  23         ff->rx_midi_error[substream->number] = false;
  24
  25         ACCESS_ONCE(ff->rx_midi_substreams[substream->number]) = substream;
  26
  27         return 0;
  28 }
  29
  30 static int midi_capture_close(struct snd_rawmidi_substream *substream)
  31 {
  32         /* Do nothing. */
  33         return 0;
  34 }
  35
  36 static int midi_playback_close(struct snd_rawmidi_substream *substream)
  37 {
  38         struct snd_ff *ff = substream->rmidi->private_data;
  39
  40         cancel_work_sync(&ff->rx_midi_work[substream->number]);
  41         ACCESS_ONCE(ff->rx_midi_substreams[substream->number]) = NULL;
  42
  43         return 0;
  44 }
  45
  46 static void midi_capture_trigger(struct snd_rawmidi_substream *substream,
  47                                  int up)
  48 {
  49         struct snd_ff *ff = substream->rmidi->private_data;
  50         unsigned long flags;
  51
  52         spin_lock_irqsave(&ff->lock, flags);
  53
  54         if (up)
  55                 ACCESS_ONCE(ff->tx_midi_substreams[substream->number]) =
  56                                                                 substream;
  57         else
  58                 ACCESS_ONCE(ff->tx_midi_substreams[substream->number]) = NULL;
  59
  60         spin_unlock_irqrestore(&ff->lock, flags);
  61 }
  62
  63 static void midi_playback_trigger(struct snd_rawmidi_substream *substream,
  64                                   int up)
  65 {
  66         struct snd_ff *ff = substream->rmidi->private_data;
  67         unsigned long flags;
  68
  69         spin_lock_irqsave(&ff->lock, flags);
  70
  71         if (up || !ff->rx_midi_error[substream->number])
  72                 schedule_work(&ff->rx_midi_work[substream->number]);
  73
  74         spin_unlock_irqrestore(&ff->lock, flags);
  75 }
  76
  77 static void set_midi_substream_names(struct snd_rawmidi_str *stream,
  78                                      const char *const name)
  79 {
  80         struct snd_rawmidi_substream *substream;
  81
  82         list_for_each_entry(substream, &stream->substreams, list) {
  83                 snprintf(substream->name, sizeof(substream->name),
  84                          "%s MIDI %d", name, substream->number + 1);
  85         }
  86 }
  87
  88 int snd_ff_create_midi_devices(struct snd_ff *ff)
  89 {
  90         static const struct snd_rawmidi_ops midi_capture_ops = {
  91                 .open           = midi_capture_open,
  92                 .close          = midi_capture_close,
  93                 .trigger        = midi_capture_trigger,
  94         };
  95         static const struct snd_rawmidi_ops midi_playback_ops = {
  96                 .open           = midi_playback_open,
  97                 .close          = midi_playback_close,
  98                 .trigger        = midi_playback_trigger,
  99         };
 100         struct snd_rawmidi *rmidi;
 101         struct snd_rawmidi_str *stream;
 102         int err;
 103
 104         err = snd_rawmidi_new(ff->card, ff->card->driver, 0,
 105                               ff->spec->midi_out_ports, ff->spec->midi_in_ports,
 106                               &rmidi);
 107         if (err < 0)
 108                 return err;
 109
 110         snprintf(rmidi->name, sizeof(rmidi->name),
 111                  "%s MIDI", ff->card->shortname);
 112         rmidi->private_data = ff;
 113
 114         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 115         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 116                             &midi_capture_ops);
 117         stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
 118         set_midi_substream_names(stream, ff->card->shortname);
 119
 120         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 121         snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 122                             &midi_playback_ops);
 123         stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
 124         set_midi_substream_names(stream, ff->card->shortname);
 125
 126         rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 127
 128         return 0;
 129 }