sound/firewire/dice/dice-midi.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * dice_midi.c - a part of driver for Dice based devices
   4  *
   5  * Copyright (c) 2014 Takashi Sakamoto
   6  */
   7 #include "dice.h"
   8
   9 static int midi_open(struct snd_rawmidi_substream *substream)
  10 {
  11         struct snd_dice *dice = substream->rmidi->private_data;
  12         int err;
  13
  14         err = snd_dice_stream_lock_try(dice);
  15         if (err < 0)
  16                 return err;
  17
  18         mutex_lock(&dice->mutex);
  19
  20         err = snd_dice_stream_reserve_duplex(dice, 0, 0, 0);
  21         if (err >= 0) {
  22                 ++dice->substreams_counter;
  23                 err = snd_dice_stream_start_duplex(dice);
  24                 if (err < 0)
  25                         --dice->substreams_counter;
  26         }
  27
  28         mutex_unlock(&dice->mutex);
  29
  30         if (err < 0)
  31                 snd_dice_stream_lock_release(dice);
  32
  33         return err;
  34 }
  35
  36 static int midi_close(struct snd_rawmidi_substream *substream)
  37 {
  38         struct snd_dice *dice = substream->rmidi->private_data;
  39
  40         mutex_lock(&dice->mutex);
  41
  42         --dice->substreams_counter;
  43         snd_dice_stream_stop_duplex(dice);
  44
  45         mutex_unlock(&dice->mutex);
  46
  47         snd_dice_stream_lock_release(dice);
  48         return 0;
  49 }
  50
  51 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
  52 {
  53         struct snd_dice *dice = substrm->rmidi->private_data;
  54         unsigned long flags;
  55
  56         spin_lock_irqsave(&dice->lock, flags);
  57
  58         if (up)
  59                 amdtp_am824_midi_trigger(&dice->tx_stream[0],
  60                                           substrm->number, substrm);
  61         else
  62                 amdtp_am824_midi_trigger(&dice->tx_stream[0],
  63                                           substrm->number, NULL);
  64
  65         spin_unlock_irqrestore(&dice->lock, flags);
  66 }
  67
  68 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
  69 {
  70         struct snd_dice *dice = substrm->rmidi->private_data;
  71         unsigned long flags;
  72
  73         spin_lock_irqsave(&dice->lock, flags);
  74
  75         if (up)
  76                 amdtp_am824_midi_trigger(&dice->rx_stream[0],
  77                                          substrm->number, substrm);
  78         else
  79                 amdtp_am824_midi_trigger(&dice->rx_stream[0],
  80                                          substrm->number, NULL);
  81
  82         spin_unlock_irqrestore(&dice->lock, flags);
  83 }
  84
  85 static void set_midi_substream_names(struct snd_dice *dice,
  86                                      struct snd_rawmidi_str *str)
  87 {
  88         struct snd_rawmidi_substream *subs;
  89
  90         list_for_each_entry(subs, &str->substreams, list) {
  91                 scnprintf(subs->name, sizeof(subs->name),
  92                           "%s MIDI %d", dice->card->shortname, subs->number + 1);
  93         }
  94 }
  95
  96 int snd_dice_create_midi(struct snd_dice *dice)
  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         unsigned int midi_in_ports, midi_out_ports;
 111         int i;
 112         int err;
 113
 114         midi_in_ports = 0;
 115         midi_out_ports = 0;
 116         for (i = 0; i < MAX_STREAMS; ++i) {
 117                 midi_in_ports = max(midi_in_ports, dice->tx_midi_ports[i]);
 118                 midi_out_ports = max(midi_out_ports, dice->rx_midi_ports[i]);
 119         }
 120
 121         if (midi_in_ports + midi_out_ports == 0)
 122                 return 0;
 123
 124         /* create midi ports */
 125         err = snd_rawmidi_new(dice->card, dice->card->driver, 0,
 126                               midi_out_ports, midi_in_ports,
 127                               &rmidi);
 128         if (err < 0)
 129                 return err;
 130
 131         snprintf(rmidi->name, sizeof(rmidi->name),
 132                  "%s MIDI", dice->card->shortname);
 133         rmidi->private_data = dice;
 134
 135         if (midi_in_ports > 0) {
 136                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 137
 138                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 139                                     &capture_ops);
 140
 141                 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
 142
 143                 set_midi_substream_names(dice, str);
 144         }
 145
 146         if (midi_out_ports > 0) {
 147                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 148
 149                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 150                                     &playback_ops);
 151
 152                 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
 153
 154                 set_midi_substream_names(dice, str);
 155         }
 156
 157         if ((midi_out_ports > 0) && (midi_in_ports > 0))
 158                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 159
 160         return 0;
 161 }