1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * bebob_midi.c - a part of driver for BeBoB based devices 4 * 5 * Copyright (c) 2013-2014 Takashi Sakamoto 6 */ 7 8 #include "bebob.h" 9 10 static int midi_open(struct snd_rawmidi_substream *substream) 11 { 12 struct snd_bebob *bebob = substream->rmidi->private_data; 13 int err; 14 15 err = snd_bebob_stream_lock_try(bebob); 16 if (err < 0) 17 return err; 18 19 mutex_lock(&bebob->mutex); 20 err = snd_bebob_stream_reserve_duplex(bebob, 0); 21 if (err >= 0) { 22 ++bebob->substreams_counter; 23 err = snd_bebob_stream_start_duplex(bebob); 24 if (err < 0) 25 --bebob->substreams_counter; 26 } 27 mutex_unlock(&bebob->mutex); 28 if (err < 0) 29 snd_bebob_stream_lock_release(bebob); 30 31 return err; 32 } 33 34 static int midi_close(struct snd_rawmidi_substream *substream) 35 { 36 struct snd_bebob *bebob = substream->rmidi->private_data; 37 38 mutex_lock(&bebob->mutex); 39 bebob->substreams_counter--; 40 snd_bebob_stream_stop_duplex(bebob); 41 mutex_unlock(&bebob->mutex); 42 43 snd_bebob_stream_lock_release(bebob); 44 return 0; 45 } 46 47 static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up) 48 { 49 struct snd_bebob *bebob = substrm->rmidi->private_data; 50 unsigned long flags; 51 52 spin_lock_irqsave(&bebob->lock, flags); 53 54 if (up) 55 amdtp_am824_midi_trigger(&bebob->tx_stream, 56 substrm->number, substrm); 57 else 58 amdtp_am824_midi_trigger(&bebob->tx_stream, 59 substrm->number, NULL); 60 61 spin_unlock_irqrestore(&bebob->lock, flags); 62 } 63 64 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up) 65 { 66 struct snd_bebob *bebob = substrm->rmidi->private_data; 67 unsigned long flags; 68 69 spin_lock_irqsave(&bebob->lock, flags); 70 71 if (up) 72 amdtp_am824_midi_trigger(&bebob->rx_stream, 73 substrm->number, substrm); 74 else 75 amdtp_am824_midi_trigger(&bebob->rx_stream, 76 substrm->number, NULL); 77 78 spin_unlock_irqrestore(&bebob->lock, flags); 79 } 80 81 static void set_midi_substream_names(struct snd_bebob *bebob, 82 struct snd_rawmidi_str *str) 83 { 84 struct snd_rawmidi_substream *subs; 85 86 list_for_each_entry(subs, &str->substreams, list) { 87 snprintf(subs->name, sizeof(subs->name), 88 "%s MIDI %d", 89 bebob->card->shortname, subs->number + 1); 90 } 91 } 92 93 int snd_bebob_create_midi_devices(struct snd_bebob *bebob) 94 { 95 static const struct snd_rawmidi_ops capture_ops = { 96 .open = midi_open, 97 .close = midi_close, 98 .trigger = midi_capture_trigger, 99 }; 100 static const struct snd_rawmidi_ops playback_ops = { 101 .open = midi_open, 102 .close = midi_close, 103 .trigger = midi_playback_trigger, 104 }; 105 struct snd_rawmidi *rmidi; 106 struct snd_rawmidi_str *str; 107 int err; 108 109 /* create midi ports */ 110 err = snd_rawmidi_new(bebob->card, bebob->card->driver, 0, 111 bebob->midi_output_ports, bebob->midi_input_ports, 112 &rmidi); 113 if (err < 0) 114 return err; 115 116 snprintf(rmidi->name, sizeof(rmidi->name), 117 "%s MIDI", bebob->card->shortname); 118 rmidi->private_data = bebob; 119 120 if (bebob->midi_input_ports > 0) { 121 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; 122 123 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 124 &capture_ops); 125 126 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]; 127 128 set_midi_substream_names(bebob, str); 129 } 130 131 if (bebob->midi_output_ports > 0) { 132 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; 133 134 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 135 &playback_ops); 136 137 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]; 138 139 set_midi_substream_names(bebob, str); 140 } 141 142 if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0)) 143 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; 144 145 return 0; 146 } 147