linux/sound/firewire/bebob/bebob_midi.c
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   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
  10static 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, 0, 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
  34static 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
  47static 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
  64static 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
  81static 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
  93int 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}
 147