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 err = snd_dice_stream_reserve_duplex(dice, 0); 22 if (err >= 0) { 23 ++dice->substreams_counter; 24 err = snd_dice_stream_start_duplex(dice); 25 } 26 27 mutex_unlock(&dice->mutex); 28 29 if (err < 0) 30 snd_dice_stream_lock_release(dice); 31 32 return err; 33 } 34 35 static int midi_close(struct snd_rawmidi_substream *substream) 36 { 37 struct snd_dice *dice = substream->rmidi->private_data; 38 39 mutex_lock(&dice->mutex); 40 41 --dice->substreams_counter; 42 snd_dice_stream_stop_duplex(dice); 43 44 mutex_unlock(&dice->mutex); 45 46 snd_dice_stream_lock_release(dice); 47 return 0; 48 } 49 50 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up) 51 { 52 struct snd_dice *dice = substrm->rmidi->private_data; 53 unsigned long flags; 54 55 spin_lock_irqsave(&dice->lock, flags); 56 57 if (up) 58 amdtp_am824_midi_trigger(&dice->tx_stream[0], 59 substrm->number, substrm); 60 else 61 amdtp_am824_midi_trigger(&dice->tx_stream[0], 62 substrm->number, NULL); 63 64 spin_unlock_irqrestore(&dice->lock, flags); 65 } 66 67 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up) 68 { 69 struct snd_dice *dice = substrm->rmidi->private_data; 70 unsigned long flags; 71 72 spin_lock_irqsave(&dice->lock, flags); 73 74 if (up) 75 amdtp_am824_midi_trigger(&dice->rx_stream[0], 76 substrm->number, substrm); 77 else 78 amdtp_am824_midi_trigger(&dice->rx_stream[0], 79 substrm->number, NULL); 80 81 spin_unlock_irqrestore(&dice->lock, flags); 82 } 83 84 static void set_midi_substream_names(struct snd_dice *dice, 85 struct snd_rawmidi_str *str) 86 { 87 struct snd_rawmidi_substream *subs; 88 89 list_for_each_entry(subs, &str->substreams, list) { 90 snprintf(subs->name, sizeof(subs->name), 91 "%s MIDI %d", dice->card->shortname, subs->number + 1); 92 } 93 } 94 95 int snd_dice_create_midi(struct snd_dice *dice) 96 { 97 static const struct snd_rawmidi_ops capture_ops = { 98 .open = midi_open, 99 .close = midi_close, 100 .trigger = midi_capture_trigger, 101 }; 102 static const struct snd_rawmidi_ops playback_ops = { 103 .open = midi_open, 104 .close = midi_close, 105 .trigger = midi_playback_trigger, 106 }; 107 struct snd_rawmidi *rmidi; 108 struct snd_rawmidi_str *str; 109 unsigned int midi_in_ports, midi_out_ports; 110 int i; 111 int err; 112 113 midi_in_ports = 0; 114 midi_out_ports = 0; 115 for (i = 0; i < MAX_STREAMS; ++i) { 116 midi_in_ports = max(midi_in_ports, dice->tx_midi_ports[i]); 117 midi_out_ports = max(midi_out_ports, dice->rx_midi_ports[i]); 118 } 119 120 if (midi_in_ports + midi_out_ports == 0) 121 return 0; 122 123 /* create midi ports */ 124 err = snd_rawmidi_new(dice->card, dice->card->driver, 0, 125 midi_out_ports, midi_in_ports, 126 &rmidi); 127 if (err < 0) 128 return err; 129 130 snprintf(rmidi->name, sizeof(rmidi->name), 131 "%s MIDI", dice->card->shortname); 132 rmidi->private_data = dice; 133 134 if (midi_in_ports > 0) { 135 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; 136 137 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 138 &capture_ops); 139 140 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]; 141 142 set_midi_substream_names(dice, str); 143 } 144 145 if (midi_out_ports > 0) { 146 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; 147 148 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 149 &playback_ops); 150 151 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]; 152 153 set_midi_substream_names(dice, str); 154 } 155 156 if ((midi_out_ports > 0) && (midi_in_ports > 0)) 157 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; 158 159 return 0; 160 } 161