LXR linux/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
  10static 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
  32static 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
  47static 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
  64static 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
  81static void set_midi_substream_names(struct snd_dice *dice,
  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", dice->card->shortname, subs->number + 1);
  89        }
  90}
  91
  92int snd_dice_create_midi(struct snd_dice *dice)
  93{
  94        static const struct snd_rawmidi_ops capture_ops = {
  95                .open           = midi_open,
  96                .close          = midi_close,
  97                .trigger        = midi_capture_trigger,
  98        };
  99        static const struct snd_rawmidi_ops playback_ops = {
 100                .open           = midi_open,
 101                .close          = midi_close,
 102                .trigger        = midi_playback_trigger,
 103        };
 104        __be32 reg;
 105        struct snd_rawmidi *rmidi;
 106        struct snd_rawmidi_str *str;
 107        unsigned int midi_in_ports, midi_out_ports;
 108        int err;
 109
 110        /*
 111         * Use the number of MIDI conformant data channel at current sampling
 112         * transfer frequency.
 113         */
 114        err = snd_dice_transaction_read_tx(dice, TX_NUMBER_MIDI,
 115                                           &reg, sizeof(reg));
 116        if (err < 0)
 117                return err;
 118        midi_in_ports = be32_to_cpu(reg);
 119
 120        err = snd_dice_transaction_read_rx(dice, RX_NUMBER_MIDI,
 121                                           &reg, sizeof(reg));
 122        if (err < 0)
 123                return err;
 124        midi_out_ports = be32_to_cpu(reg);
 125
 126        if (midi_in_ports + midi_out_ports == 0)
 127                return 0;
 128
 129        /* create midi ports */
 130        err = snd_rawmidi_new(dice->card, dice->card->driver, 0,
 131                              midi_out_ports, midi_in_ports,
 132                              &rmidi);
 133        if (err < 0)
 134                return err;
 135
 136        snprintf(rmidi->name, sizeof(rmidi->name),
 137                 "%s MIDI", dice->card->shortname);
 138        rmidi->private_data = dice;
 139
 140        if (midi_in_ports > 0) {
 141                rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
 142
 143                snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 144                                    &capture_ops);
 145
 146                str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
 147
 148                set_midi_substream_names(dice, str);
 149        }
 150
 151        if (midi_out_ports > 0) {
 152                rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
 153
 154                snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 155                                    &playback_ops);
 156
 157                str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
 158
 159                set_midi_substream_names(dice, str);
 160        }
 161
 162        if ((midi_out_ports > 0) && (midi_in_ports > 0))
 163                rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
 164
 165        return 0;
 166}
 167