sound/firewire/dice/dice-midi.c

   1 /*
   2  * dice_midi.c - a part of driver for Dice based devices
   3  *
   4  * Copyright (c) 2014 Takashi Sakamoto
   5  *
   6  * Licensed under the terms of the GNU General Public License, version 2.
   7  */
   8 #include "dice.h"
   9
  10 static int midi_open(struct snd_rawmidi_substream *substream)
  11 {
  12         struct snd_dice *dice = substream->rmidi->private_data;
  13         int err;
  14
  15         err = snd_dice_stream_lock_try(dice);
  16         if (err < 0)
  17                 return err;
  18
  19         mutex_lock(&dice->mutex);
  20
  21         dice->substreams_counter++;
  22         err = snd_dice_stream_start_duplex(dice, 0);
  23
  24         mutex_unlock(&dice->mutex);
  25
  26         if (err < 0)
  27                 snd_dice_stream_lock_release(dice);
  28
  29         return err;
  30 }
  31
  32 static int midi_close(struct snd_rawmidi_substream *substream)
  33 {
  34         struct snd_dice *dice = substream->rmidi->private_data;
  35
  36         mutex_lock(&dice->mutex);
  37
  38         dice->substreams_counter--;
  39         snd_dice_stream_stop_duplex(dice);
  40
  41         mutex_unlock(&dice->mutex);
  42
  43         snd_dice_stream_lock_release(dice);
  44         return 0;
  45 }
  46
  47 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
  48 {
  49         struct snd_dice *dice = substrm->rmidi->private_data;
  50         unsigned long flags;
  51
  52         spin_lock_irqsave(&dice->lock, flags);
  53
  54         if (up)
  55                 amdtp_am824_midi_trigger(&dice->tx_stream[0],
  56                                           substrm->number, substrm);
  57         else
  58                 amdtp_am824_midi_trigger(&dice->tx_stream[0],
  59                                           substrm->number, NULL);
  60
  61         spin_unlock_irqrestore(&dice->lock, flags);
  62 }
  63
  64 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
  65 {
  66         struct snd_dice *dice = substrm->rmidi->private_data;
  67         unsigned long flags;
  68
  69         spin_lock_irqsave(&dice->lock, flags);
  70
  71         if (up)
  72                 amdtp_am824_midi_trigger(&dice->rx_stream[0],
  73                                          substrm->number, substrm);
  74         else
  75                 amdtp_am824_midi_trigger(&dice->rx_stream[0],
  76                                          substrm->number, NULL);
  77
  78         spin_unlock_irqrestore(&dice->lock, flags);
  79 }
  80
  81 static struct snd_rawmidi_ops capture_ops = {
  82         .open           = midi_open,
  83         .close          = midi_close,
  84         .trigger        = midi_capture_trigger,
  85 };
  86
  87 static struct snd_rawmidi_ops playback_ops = {
  88         .open           = midi_open,
  89         .close          = midi_close,
  90         .trigger        = midi_playback_trigger,
  91 };
  92
  93 static void set_midi_substream_names(struct snd_dice *dice,
  94                                      struct snd_rawmidi_str *str)
  95 {
  96         struct snd_rawmidi_substream *subs;
  97
  98         list_for_each_entry(subs, &str->substreams, list) {
  99                 snprintf(subs->name, sizeof(subs->name),
 100                          "%s MIDI %d", dice->card->shortname, subs->number + 1);
 101         }
 102 }
 103
 104 int snd_dice_create_midi(struct snd_dice *dice)
 105 {
 106         __be32 reg;
 107         struct snd_rawmidi *rmidi;
 108         struct snd_rawmidi_str *str;
 109         unsigned int midi_in_ports, midi_out_ports;
 110         int err;
 111
 112         /*
 113          * Use the number of MIDI conformant data channel at current sampling
 114          * transfer frequency.
 115          */
 116         err = snd_dice_transaction_read_tx(dice, TX_NUMBER_MIDI,
 117                                            &reg, sizeof(reg));
 118         if (err < 0)
 119                 return err;
 120         midi_in_ports = be32_to_cpu(reg);
 121
 122         err = snd_dice_transaction_read_rx(dice, RX_NUMBER_MIDI,
 123                                            &reg, sizeof(reg));
 124         if (err < 0)
 125                 return err;
 126         midi_out_ports = be32_to_cpu(reg);
 127
 128         if (midi_in_ports + midi_out_ports == 0)
 129                 return 0;
 130
 131         /* create midi ports */
 132         err = snd_rawmidi_new(dice->card, dice->card->driver, 0,
 133                               midi_out_ports, midi_in_ports,
 134                               &rmidi);
 135         if (err < 0)
 136                 return err;
 137
 138         snprintf(rmidi->name, sizeof(rmidi->name),
 139                  "%s MIDI", dice->card->shortname);
 140         rmidi->private_data = dice;
 141
 142         if (midi_in_ports > 0) {
 143                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 144
 145                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 146                                     &capture_ops);
 147
 148                 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
 149
 150                 set_midi_substream_names(dice, str);
 151         }
 152
 153         if (midi_out_ports > 0) {
 154                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 155
 156                 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 157                                     &playback_ops);
 158
 159                 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
 160
 161                 set_midi_substream_names(dice, str);
 162         }
 163
 164         if ((midi_out_ports > 0) && (midi_in_ports > 0))
 165                 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 166
 167         return 0;
 168 }