Digi 002/003 uses AM824 format data to transfer MIDI messages. It's a first data channel in each data block of CIP packet.
This commit adds MIDI functionality to transfer/receive MIDI messages in the first data channel, with AMDTP functionality ALSA firewire stack gives. But the device handles these MIDI message in disorder because Digi 002/003 are not conformant to MMA/AMEI RP-027 or IEC 61883-6:2005.
Signed-off-by: Takashi Sakamoto o-takashi@sakamocchi.jp --- sound/firewire/digi00x/Makefile | 3 +- sound/firewire/digi00x/digi00x-midi.c | 149 ++++++++++++++++++++++++++++++++ sound/firewire/digi00x/digi00x-stream.c | 3 + sound/firewire/digi00x/digi00x.c | 4 + sound/firewire/digi00x/digi00x.h | 3 + 5 files changed, 161 insertions(+), 1 deletion(-) create mode 100644 sound/firewire/digi00x/digi00x-midi.c
diff --git a/sound/firewire/digi00x/Makefile b/sound/firewire/digi00x/Makefile index f2ed472..8ae72b9 100644 --- a/sound/firewire/digi00x/Makefile +++ b/sound/firewire/digi00x/Makefile @@ -1,2 +1,3 @@ -snd-digi00x-objs := digi00x.o digi00x-stream.o digi00x-proc.o digi00x-pcm.o +snd-digi00x-objs := digi00x.o digi00x-stream.o digi00x-proc.o digi00x-pcm.o \ + digi00x-midi.o obj-m += snd-digi00x.o diff --git a/sound/firewire/digi00x/digi00x-midi.c b/sound/firewire/digi00x/digi00x-midi.c new file mode 100644 index 0000000..9936c40 --- /dev/null +++ b/sound/firewire/digi00x/digi00x-midi.c @@ -0,0 +1,149 @@ +/* + * digi00x-midi.h - a part of driver for Digidesign Digi 002/003 family + * + * Copyright (c) 2014-2015 Takashi Sakamoto + * + * Licensed under the terms of the GNU General Public License, version 2. + */ + +#include "digi00x.h" + +static int midi_capture_open(struct snd_rawmidi_substream *substream) +{ + struct snd_dg00x *dg00x = substream->rmidi->private_data; + int err; + + mutex_lock(&dg00x->mutex); + dg00x->capture_substreams++; + err = snd_dg00x_stream_start_duplex(dg00x, 0); + mutex_unlock(&dg00x->mutex); + + return err; +} + +static int midi_playback_open(struct snd_rawmidi_substream *substream) +{ + struct snd_dg00x *dg00x = substream->rmidi->private_data; + int err; + + mutex_lock(&dg00x->mutex); + dg00x->playback_substreams++; + err = snd_dg00x_stream_start_duplex(dg00x, 0); + mutex_unlock(&dg00x->mutex); + + return err; +} + +static int midi_capture_close(struct snd_rawmidi_substream *substream) +{ + struct snd_dg00x *dg00x = substream->rmidi->private_data; + + mutex_lock(&dg00x->mutex); + dg00x->capture_substreams--; + snd_dg00x_stream_stop_duplex(dg00x); + mutex_unlock(&dg00x->mutex); + + return 0; +} + +static int midi_playback_close(struct snd_rawmidi_substream *substream) +{ + struct snd_dg00x *dg00x = substream->rmidi->private_data; + + mutex_lock(&dg00x->mutex); + dg00x->playback_substreams--; + snd_dg00x_stream_stop_duplex(dg00x); + mutex_unlock(&dg00x->mutex); + + return 0; +} + +static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up) +{ + struct snd_dg00x *dg00x = substrm->rmidi->private_data; + unsigned long flags; + + spin_lock_irqsave(&dg00x->lock, flags); + + if (up) + amdtp_stream_midi_trigger(&dg00x->tx_stream, + substrm->number, substrm); + else + amdtp_stream_midi_trigger(&dg00x->tx_stream, + substrm->number, NULL); + + spin_unlock_irqrestore(&dg00x->lock, flags); +} + +static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up) +{ + struct snd_dg00x *dg00x = substrm->rmidi->private_data; + unsigned long flags; + + spin_lock_irqsave(&dg00x->lock, flags); + + if (up) + amdtp_stream_midi_trigger(&dg00x->rx_stream, + substrm->number, substrm); + else + amdtp_stream_midi_trigger(&dg00x->rx_stream, + substrm->number, NULL); + + spin_unlock_irqrestore(&dg00x->lock, flags); +} + +static struct snd_rawmidi_ops midi_capture_ops = { + .open = midi_capture_open, + .close = midi_capture_close, + .trigger = midi_capture_trigger, +}; + +static struct snd_rawmidi_ops midi_playback_ops = { + .open = midi_playback_open, + .close = midi_playback_close, + .trigger = midi_playback_trigger, +}; + +static void set_midi_substream_names(struct snd_dg00x *dg00x, + struct snd_rawmidi_str *str) +{ + struct snd_rawmidi_substream *subs; + + list_for_each_entry(subs, &str->substreams, list) { + snprintf(subs->name, sizeof(subs->name), + "%s MIDI %d", + dg00x->card->shortname, subs->number + 1); + } +} + +int snd_dg00x_create_midi_devices(struct snd_dg00x *dg00x) +{ + struct snd_rawmidi *rmidi; + struct snd_rawmidi_str *str; + int err; + + err = snd_rawmidi_new(dg00x->card, dg00x->card->driver, 0, + 1, 2, &rmidi); + if (err < 0) + return err; + + snprintf(rmidi->name, sizeof(rmidi->name), + "%s MIDI", dg00x->card->shortname); + rmidi->private_data = dg00x; + + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, + &midi_capture_ops); + str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]; + set_midi_substream_names(dg00x, str); + + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; + snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, + &midi_playback_ops); + str = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]; + set_midi_substream_names(dg00x, str); + + rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; + + return 0; +} diff --git a/sound/firewire/digi00x/digi00x-stream.c b/sound/firewire/digi00x/digi00x-stream.c index 1d5ef01..abc9606 100644 --- a/sound/firewire/digi00x/digi00x-stream.c +++ b/sound/firewire/digi00x/digi00x-stream.c @@ -252,6 +252,9 @@ int snd_dg00x_stream_start_duplex(struct snd_dg00x *dg00x, unsigned int rate) err = snd_dg00x_stream_get_rate(dg00x, &curr_rate); if (err < 0) goto error; + /* For MIDI substreams. */ + if (rate == 0) + rate = curr_rate; if ((curr_rate != rate) | amdtp_streaming_error(&dg00x->tx_stream) | amdtp_streaming_error(&dg00x->rx_stream)) { diff --git a/sound/firewire/digi00x/digi00x.c b/sound/firewire/digi00x/digi00x.c index 493437a..5b678ec 100644 --- a/sound/firewire/digi00x/digi00x.c +++ b/sound/firewire/digi00x/digi00x.c @@ -90,6 +90,10 @@ static int snd_dg00x_probe(struct fw_unit *unit, if (err < 0) goto error;
+ err = snd_dg00x_create_midi_devices(dg00x); + if (err < 0) + goto error; + err = snd_card_register(card); if (err < 0) goto error; diff --git a/sound/firewire/digi00x/digi00x.h b/sound/firewire/digi00x/digi00x.h index 318b1b5..1ef5d9e 100644 --- a/sound/firewire/digi00x/digi00x.h +++ b/sound/firewire/digi00x/digi00x.h @@ -23,6 +23,7 @@ #include <sound/info.h> #include <sound/pcm.h> #include <sound/pcm_params.h> +#include <sound/rawmidi.h>
#include "../lib.h" #include "../packets-buffer.h" @@ -111,4 +112,6 @@ void snd_dg00x_stream_destroy_duplex(struct snd_dg00x *dg00x); void snd_dg00x_proc_init(struct snd_dg00x *dg00x);
int snd_dg00x_create_pcm_devices(struct snd_dg00x *dg00x); + +int snd_dg00x_create_midi_devices(struct snd_dg00x *dg00x); #endif