sound/firewire/bebob/bebob_midi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * bebob_midi.c - a part of driver for BeBoB based devices
   4  *
   5  * Copyright (c) 2013-2014 Takashi Sakamoto
   6  */
   7
   8 #include "bebob.h"
   9
  10 static int midi_open(struct snd_rawmidi_substream *substream)
  11 {
  12         struct snd_bebob *bebob = substream->rmidi->private_data;
  13         int err;
  14
  15         err = snd_bebob_stream_lock_try(bebob);
  16         if (err < 0)
  17                 return err;
  18
  19         mutex_lock(&bebob->mutex);
  20         err = snd_bebob_stream_reserve_duplex(bebob, 0);
  21         if (err >= 0) {
  22                 ++bebob->substreams_counter;
  23                 err = snd_bebob_stream_start_duplex(bebob);
  24                 if (err < 0)
  25                         --bebob->substreams_counter;
  26         }
  27         mutex_unlock(&bebob->mutex);
  28         if (err < 0)
  29                 snd_bebob_stream_lock_release(bebob);
  30
  31         return err;
  32 }
  33
  34 static int midi_close(struct snd_rawmidi_substream *substream)
  35 {
  36         struct snd_bebob *bebob = substream->rmidi->private_data;
  37
  38         mutex_lock(&bebob->mutex);
  39         bebob->substreams_counter--;
  40         snd_bebob_stream_stop_duplex(bebob);
  41         mutex_unlock(&bebob->mutex);
  42
  43         snd_bebob_stream_lock_release(bebob);
  44         return 0;
  45 }
  46
  47 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
  48 {
  49         struct snd_bebob *bebob = substrm->rmidi->private_data;
  50         unsigned long flags;
  51
  52         spin_lock_irqsave(&bebob->lock, flags);
  53
  54         if (up)
  55                 amdtp_am824_midi_trigger(&bebob->tx_stream,
  56                                          substrm->number, substrm);
  57         else
  58                 amdtp_am824_midi_trigger(&bebob->tx_stream,
  59                                          substrm->number, NULL);
  60
  61         spin_unlock_irqrestore(&bebob->lock, flags);
  62 }
  63
  64 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
  65 {
  66         struct snd_bebob *bebob = substrm->rmidi->private_data;
  67         unsigned long flags;
  68
  69         spin_lock_irqsave(&bebob->lock, flags);
  70
  71         if (up)
  72                 amdtp_am824_midi_trigger(&bebob->rx_stream,
  73                                          substrm->number, substrm);
  74         else
  75                 amdtp_am824_midi_trigger(&bebob->rx_stream,
  76                                          substrm->number, NULL);
  77
  78         spin_unlock_irqrestore(&bebob->lock, flags);
  79 }
  80
  81 static void set_midi_substream_names(struct snd_bebob *bebob,
  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",
  89                          bebob->card->shortname, subs->number + 1);
  90         }
  91 }
  92
  93 int snd_bebob_create_midi_devices(struct snd_bebob *bebob)
  94 {
  95         static const struct snd_rawmidi_ops capture_ops = {
  96                 .open           = midi_open,
  97                 .close          = midi_close,
  98                 .trigger        = midi_capture_trigger,
  99         };
 100         static const struct snd_rawmidi_ops playback_ops = {
 101                 .open           = midi_open,
 102                 .close          = midi_close,
 103                 .trigger        = midi_playback_trigger,
 104         };
 105         struct snd_rawmidi *rmidi;
 106         struct snd_rawmidi_str *str;
 107         int err;
 108
 109         /* create midi ports */
 110         err = snd_rawmidi_new(bebob->card, bebob->card->driver, 0,
 111                               bebob->midi_output_ports, bebob->midi_input_ports,
 112                               &rmidi);
 113         if (err < 0)
 114                 return err;
 115
 116         snprintf(rmidi->name, sizeof(rmidi->name),
 117                  "%s MIDI", bebob->card->shortname);
 118         rmidi->private_data = bebob;
 119
 120         if (bebob->midi_input_ports > 0) {
 121                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 122
 123                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 124                                     &capture_ops);
 125
 126                 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
 127
 128                 set_midi_substream_names(bebob, str);
 129         }
 130
 131         if (bebob->midi_output_ports > 0) {
 132                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 133
 134                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 135                                     &playback_ops);
 136
 137                 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
 138
 139                 set_midi_substream_names(bebob, str);
 140         }
 141
 142         if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0))
 143                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 144
 145         return 0;
 146 }