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 scoped_guard(mutex, &bebob->mutex) { 20 err = snd_bebob_stream_reserve_duplex(bebob, 0, 0, 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 } 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 scoped_guard(mutex, &bebob->mutex) { 39 bebob->substreams_counter--; 40 snd_bebob_stream_stop_duplex(bebob); 41 } 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 51 guard(spinlock_irqsave)(&bebob->lock); 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 61 static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up) 62 { 63 struct snd_bebob *bebob = substrm->rmidi->private_data; 64 65 guard(spinlock_irqsave)(&bebob->lock); 66 67 if (up) 68 amdtp_am824_midi_trigger(&bebob->rx_stream, 69 substrm->number, substrm); 70 else 71 amdtp_am824_midi_trigger(&bebob->rx_stream, 72 substrm->number, NULL); 73 } 74 75 static void set_midi_substream_names(struct snd_bebob *bebob, 76 struct snd_rawmidi_str *str) 77 { 78 struct snd_rawmidi_substream *subs; 79 80 list_for_each_entry(subs, &str->substreams, list) { 81 scnprintf(subs->name, sizeof(subs->name), 82 "%s MIDI %d", 83 bebob->card->shortname, subs->number + 1); 84 } 85 } 86 87 int snd_bebob_create_midi_devices(struct snd_bebob *bebob) 88 { 89 static const struct snd_rawmidi_ops capture_ops = { 90 .open = midi_open, 91 .close = midi_close, 92 .trigger = midi_capture_trigger, 93 }; 94 static const struct snd_rawmidi_ops playback_ops = { 95 .open = midi_open, 96 .close = midi_close, 97 .trigger = midi_playback_trigger, 98 }; 99 struct snd_rawmidi *rmidi; 100 struct snd_rawmidi_str *str; 101 int err; 102 103 /* create midi ports */ 104 err = snd_rawmidi_new(bebob->card, bebob->card->driver, 0, 105 bebob->midi_output_ports, bebob->midi_input_ports, 106 &rmidi); 107 if (err < 0) 108 return err; 109 110 snprintf(rmidi->name, sizeof(rmidi->name), 111 "%s MIDI", bebob->card->shortname); 112 rmidi->private_data = bebob; 113 114 if (bebob->midi_input_ports > 0) { 115 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; 116 117 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, 118 &capture_ops); 119 120 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]; 121 122 set_midi_substream_names(bebob, str); 123 } 124 125 if (bebob->midi_output_ports > 0) { 126 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; 127 128 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, 129 &playback_ops); 130 131 str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]; 132 133 set_midi_substream_names(bebob, str); 134 } 135 136 if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0)) 137 rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; 138 139 return 0; 140 } 141