1 /* 2 * bebob_midi.c - a part of driver for BeBoB based devices 3 * 4 * Copyright (c) 2013-2014 Takashi Sakamoto 5 * 6 * Licensed under the terms of the GNU General Public License, version 2. 7 */ 8 9 #include "bebob.h" 10 11 static int midi_open(struct snd_rawmidi_substream *substream) 12 { 13 struct snd_bebob *bebob = substream->rmidi->private_data; 14 int err; 15 16 err = snd_bebob_stream_lock_try(bebob); 17 if (err < 0) 18 return err; 19 20 mutex_lock(&bebob->mutex); 21 err = snd_bebob_stream_reserve_duplex(bebob, 0); 22 if (err >= 0) { 23 ++bebob->substreams_counter; 24 err = snd_bebob_stream_start_duplex(bebob); 25 } 26 mutex_unlock(&bebob->mutex); 27 if (err < 0) 28 snd_bebob_stream_lock_release(bebob); 29 30 return err; 31 } 32 33 static int midi_close(struct snd_rawmidi_substream *substream) 34 { 35 struct snd_bebob *bebob = substream->rmidi->private_data; 36 37 mutex_lock(&bebob->mutex); 38 bebob->substreams_counter--; 39 snd_bebob_stream_stop_duplex(bebob); 40 mutex_unlock(&bebob->mutex); 41 42 snd_bebob_stream_lock_release(bebob); 43 return 0; 44 } 45 46 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up) 47 { 48 struct snd_bebob *bebob = substrm->rmidi->private_data; 49 unsigned long flags; 50 51 spin_lock_irqsave(&bebob->lock, flags); 52 53 if (up) 54 amdtp_am824_midi_trigger(&bebob->tx_stream, 55 substrm->number, substrm); 56 else 57 amdtp_am824_midi_trigger(&bebob->tx_stream, 58 substrm->number, NULL); 59 60 spin_unlock_irqrestore(&bebob->lock, flags); 61 } 62 63 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up) 64 { 65 struct snd_bebob *bebob = substrm->rmidi->private_data; 66 unsigned long flags; 67 68 spin_lock_irqsave(&bebob->lock, flags); 69 70 if (up) 71 amdtp_am824_midi_trigger(&bebob->rx_stream, 72 substrm->number, substrm); 73 else 74 amdtp_am824_midi_trigger(&bebob->rx_stream, 75 substrm->number, NULL); 76 77 spin_unlock_irqrestore(&bebob->lock, flags); 78 } 79 80 static void set_midi_substream_names(struct snd_bebob *bebob, 81 struct snd_rawmidi_str *str) 82 { 83 struct snd_rawmidi_substream *subs; 84 85 list_for_each_entry(subs, &str->substreams, list) { 86 snprintf(subs->name, sizeof(subs->name), 87 "%s MIDI %d", 88 bebob->card->shortname, subs->number + 1); 89 } 90 } 91 92 int snd_bebob_create_midi_devices(struct snd_bebob *bebob) 93 { 94 static const struct snd_rawmidi_ops capture_ops = { 95 .open = midi_open, 96 .close = midi_close, 97 .trigger = midi_capture_trigger, 98 }; 99 static const struct snd_rawmidi_ops playback_ops = { 100 .open = midi_open, 101 .close = midi_close, 102 .trigger = midi_playback_trigger, 103 }; 104 struct snd_rawmidi *rmidi; 105 struct snd_rawmidi_str *str; 106 int err; 107 108 /* create midi ports */ 109 err = snd_rawmidi_new(bebob->card, bebob->card->driver, 0, 110 bebob->midi_output_ports, bebob->midi_input_ports, 111 &rmidi); 112 if (err < 0) 113 return err; 114 115 snprintf(rmidi->name, sizeof(rmidi->name), 116 "%s MIDI", bebob->card->shortname); 117 rmidi->private_data = bebob; 118 119 if (bebob->midi_input_ports > 0) { 120 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; 121 122 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 123 &capture_ops); 124 125 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]; 126 127 set_midi_substream_names(bebob, str); 128 } 129 130 if (bebob->midi_output_ports > 0) { 131 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; 132 133 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 134 &playback_ops); 135 136 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]; 137 138 set_midi_substream_names(bebob, str); 139 } 140 141 if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0)) 142 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; 143 144 return 0; 145 } 146