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 } 162