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 scoped_guard(mutex, &dice->mutex) { 19 err = snd_dice_stream_reserve_duplex(dice, 0, 0, 0); 20 if (err >= 0) { 21 ++dice->substreams_counter; 22 err = snd_dice_stream_start_duplex(dice); 23 if (err < 0) 24 --dice->substreams_counter; 25 } 26 } 27 28 if (err < 0) 29 snd_dice_stream_lock_release(dice); 30 31 return err; 32 } 33 34 static int midi_close(struct snd_rawmidi_substream *substream) 35 { 36 struct snd_dice *dice = substream->rmidi->private_data; 37 38 scoped_guard(mutex, &dice->mutex) { 39 --dice->substreams_counter; 40 snd_dice_stream_stop_duplex(dice); 41 } 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 51 guard(spinlock_irqsave)(&dice->lock); 52 53 if (up) 54 amdtp_am824_midi_trigger(&dice->tx_stream[0], 55 substrm->number, substrm); 56 else 57 amdtp_am824_midi_trigger(&dice->tx_stream[0], 58 substrm->number, NULL); 59 } 60 61 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up) 62 { 63 struct snd_dice *dice = substrm->rmidi->private_data; 64 65 guard(spinlock_irqsave)(&dice->lock); 66 67 if (up) 68 amdtp_am824_midi_trigger(&dice->rx_stream[0], 69 substrm->number, substrm); 70 else 71 amdtp_am824_midi_trigger(&dice->rx_stream[0], 72 substrm->number, NULL); 73 } 74 75 static void set_midi_substream_names(struct snd_dice *dice, 76 struct snd_rawmidi_str *str) 77 { 78 struct snd_rawmidi_substream *subs; 79 80 list_for_each_entry(subs, &str->substreams, list) { 81 scnprintf(subs->name, sizeof(subs->name), 82 "%s MIDI %d", dice->card->shortname, subs->number + 1); 83 } 84 } 85 86 int snd_dice_create_midi(struct snd_dice *dice) 87 { 88 static const struct snd_rawmidi_ops capture_ops = { 89 .open = midi_open, 90 .close = midi_close, 91 .trigger = midi_capture_trigger, 92 }; 93 static const struct snd_rawmidi_ops playback_ops = { 94 .open = midi_open, 95 .close = midi_close, 96 .trigger = midi_playback_trigger, 97 }; 98 struct snd_rawmidi *rmidi; 99 struct snd_rawmidi_str *str; 100 unsigned int midi_in_ports, midi_out_ports; 101 int i; 102 int err; 103 104 midi_in_ports = 0; 105 midi_out_ports = 0; 106 for (i = 0; i < MAX_STREAMS; ++i) { 107 midi_in_ports = max(midi_in_ports, dice->tx_midi_ports[i]); 108 midi_out_ports = max(midi_out_ports, dice->rx_midi_ports[i]); 109 } 110 111 if (midi_in_ports + midi_out_ports == 0) 112 return 0; 113 114 /* create midi ports */ 115 err = snd_rawmidi_new(dice->card, dice->card->driver, 0, 116 midi_out_ports, midi_in_ports, 117 &rmidi); 118 if (err < 0) 119 return err; 120 121 snprintf(rmidi->name, sizeof(rmidi->name), 122 "%s MIDI", dice->card->shortname); 123 rmidi->private_data = dice; 124 125 if (midi_in_ports > 0) { 126 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; 127 128 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 129 &capture_ops); 130 131 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]; 132 133 set_midi_substream_names(dice, str); 134 } 135 136 if (midi_out_ports > 0) { 137 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; 138 139 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 140 &playback_ops); 141 142 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]; 143 144 set_midi_substream_names(dice, str); 145 } 146 147 if ((midi_out_ports > 0) && (midi_in_ports > 0)) 148 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; 149 150 return 0; 151 } 152