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 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 32 static 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 47 static 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 64 static 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 81 static struct snd_rawmidi_ops capture_ops = { 82 .open = midi_open, 83 .close = midi_close, 84 .trigger = midi_capture_trigger, 85 }; 86 87 static struct snd_rawmidi_ops playback_ops = { 88 .open = midi_open, 89 .close = midi_close, 90 .trigger = midi_playback_trigger, 91 }; 92 93 static void set_midi_substream_names(struct snd_dice *dice, 94 struct snd_rawmidi_str *str) 95 { 96 struct snd_rawmidi_substream *subs; 97 98 list_for_each_entry(subs, &str->substreams, list) { 99 snprintf(subs->name, sizeof(subs->name), 100 "%s MIDI %d", dice->card->shortname, subs->number + 1); 101 } 102 } 103 104 int snd_dice_create_midi(struct snd_dice *dice) 105 { 106 __be32 reg; 107 struct snd_rawmidi *rmidi; 108 struct snd_rawmidi_str *str; 109 unsigned int midi_in_ports, midi_out_ports; 110 int err; 111 112 /* 113 * Use the number of MIDI conformant data channel at current sampling 114 * transfer frequency. 115 */ 116 err = snd_dice_transaction_read_tx(dice, TX_NUMBER_MIDI, 117 ®, sizeof(reg)); 118 if (err < 0) 119 return err; 120 midi_in_ports = be32_to_cpu(reg); 121 122 err = snd_dice_transaction_read_rx(dice, RX_NUMBER_MIDI, 123 ®, sizeof(reg)); 124 if (err < 0) 125 return err; 126 midi_out_ports = be32_to_cpu(reg); 127 128 if (midi_in_ports + midi_out_ports == 0) 129 return 0; 130 131 /* create midi ports */ 132 err = snd_rawmidi_new(dice->card, dice->card->driver, 0, 133 midi_out_ports, midi_in_ports, 134 &rmidi); 135 if (err < 0) 136 return err; 137 138 snprintf(rmidi->name, sizeof(rmidi->name), 139 "%s MIDI", dice->card->shortname); 140 rmidi->private_data = dice; 141 142 if (midi_in_ports > 0) { 143 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; 144 145 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 146 &capture_ops); 147 148 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]; 149 150 set_midi_substream_names(dice, str); 151 } 152 153 if (midi_out_ports > 0) { 154 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; 155 156 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 157 &playback_ops); 158 159 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]; 160 161 set_midi_substream_names(dice, str); 162 } 163 164 if ((midi_out_ports > 0) && (midi_in_ports > 0)) 165 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; 166 167 return 0; 168 } 169