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_capture_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 goto end; 19 20 atomic_inc(&bebob->substreams_counter); 21 err = snd_bebob_stream_start_duplex(bebob, 0); 22 if (err < 0) 23 snd_bebob_stream_lock_release(bebob); 24 end: 25 return err; 26 } 27 28 static int midi_playback_open(struct snd_rawmidi_substream *substream) 29 { 30 struct snd_bebob *bebob = substream->rmidi->private_data; 31 int err; 32 33 err = snd_bebob_stream_lock_try(bebob); 34 if (err < 0) 35 goto end; 36 37 atomic_inc(&bebob->substreams_counter); 38 err = snd_bebob_stream_start_duplex(bebob, 0); 39 if (err < 0) 40 snd_bebob_stream_lock_release(bebob); 41 end: 42 return err; 43 } 44 45 static int midi_capture_close(struct snd_rawmidi_substream *substream) 46 { 47 struct snd_bebob *bebob = substream->rmidi->private_data; 48 49 atomic_dec(&bebob->substreams_counter); 50 snd_bebob_stream_stop_duplex(bebob); 51 52 snd_bebob_stream_lock_release(bebob); 53 return 0; 54 } 55 56 static int midi_playback_close(struct snd_rawmidi_substream *substream) 57 { 58 struct snd_bebob *bebob = substream->rmidi->private_data; 59 60 atomic_dec(&bebob->substreams_counter); 61 snd_bebob_stream_stop_duplex(bebob); 62 63 snd_bebob_stream_lock_release(bebob); 64 return 0; 65 } 66 67 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up) 68 { 69 struct snd_bebob *bebob = substrm->rmidi->private_data; 70 unsigned long flags; 71 72 spin_lock_irqsave(&bebob->lock, flags); 73 74 if (up) 75 amdtp_stream_midi_trigger(&bebob->tx_stream, 76 substrm->number, substrm); 77 else 78 amdtp_stream_midi_trigger(&bebob->tx_stream, 79 substrm->number, NULL); 80 81 spin_unlock_irqrestore(&bebob->lock, flags); 82 } 83 84 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up) 85 { 86 struct snd_bebob *bebob = substrm->rmidi->private_data; 87 unsigned long flags; 88 89 spin_lock_irqsave(&bebob->lock, flags); 90 91 if (up) 92 amdtp_stream_midi_trigger(&bebob->rx_stream, 93 substrm->number, substrm); 94 else 95 amdtp_stream_midi_trigger(&bebob->rx_stream, 96 substrm->number, NULL); 97 98 spin_unlock_irqrestore(&bebob->lock, flags); 99 } 100 101 static struct snd_rawmidi_ops midi_capture_ops = { 102 .open = midi_capture_open, 103 .close = midi_capture_close, 104 .trigger = midi_capture_trigger, 105 }; 106 107 static struct snd_rawmidi_ops midi_playback_ops = { 108 .open = midi_playback_open, 109 .close = midi_playback_close, 110 .trigger = midi_playback_trigger, 111 }; 112 113 static void set_midi_substream_names(struct snd_bebob *bebob, 114 struct snd_rawmidi_str *str) 115 { 116 struct snd_rawmidi_substream *subs; 117 118 list_for_each_entry(subs, &str->substreams, list) { 119 snprintf(subs->name, sizeof(subs->name), 120 "%s MIDI %d", 121 bebob->card->shortname, subs->number + 1); 122 } 123 } 124 125 int snd_bebob_create_midi_devices(struct snd_bebob *bebob) 126 { 127 struct snd_rawmidi *rmidi; 128 struct snd_rawmidi_str *str; 129 int err; 130 131 /* create midi ports */ 132 err = snd_rawmidi_new(bebob->card, bebob->card->driver, 0, 133 bebob->midi_output_ports, bebob->midi_input_ports, 134 &rmidi); 135 if (err < 0) 136 return err; 137 138 snprintf(rmidi->name, sizeof(rmidi->name), 139 "%s MIDI", bebob->card->shortname); 140 rmidi->private_data = bebob; 141 142 if (bebob->midi_input_ports > 0) { 143 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; 144 145 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 146 &midi_capture_ops); 147 148 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]; 149 150 set_midi_substream_names(bebob, str); 151 } 152 153 if (bebob->midi_output_ports > 0) { 154 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; 155 156 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 157 &midi_playback_ops); 158 159 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]; 160 161 set_midi_substream_names(bebob, str); 162 } 163 164 if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0)) 165 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; 166 167 return 0; 168 } 169