[alsa-devel] [PATCH 23/39] fireworks: Add MIDI interface
Takashi Sakamoto
o-takashi at sakamocchi.jp
Wed Mar 5 11:48:11 CET 2014
This commit adds a functionality to capture/playback MIDI messages.
When no AMDTP streams are running, this driver starts AMDTP stream for MIDI
stream at current sampling rate.
---
sound/firewire/Kconfig | 1 +
sound/firewire/fireworks/Makefile | 3 +-
sound/firewire/fireworks/fireworks.c | 6 ++
sound/firewire/fireworks/fireworks.h | 3 +
sound/firewire/fireworks/fireworks_midi.c | 158 ++++++++++++++++++++++++++++++
5 files changed, 170 insertions(+), 1 deletion(-)
create mode 100644 sound/firewire/fireworks/fireworks_midi.c
diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig
index 0b85ebd..36a1212 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -64,6 +64,7 @@ config SND_SCS1X
config SND_FIREWORKS
tristate "Echo Fireworks board module support"
select SND_FIREWIRE_LIB
+ select SND_RAWMIDI
help
Say Y here to include support for FireWire devices based
on Echo Digital Audio Fireworks board:
diff --git a/sound/firewire/fireworks/Makefile b/sound/firewire/fireworks/Makefile
index 52bd15e..a2cecc6 100644
--- a/sound/firewire/fireworks/Makefile
+++ b/sound/firewire/fireworks/Makefile
@@ -1,3 +1,4 @@
snd-fireworks-objs := fireworks_transaction.o fireworks_command.o \
- fireworks_stream.o fireworks_proc.o fireworks.o
+ fireworks_stream.o fireworks_proc.o fireworks_midi.o \
+ fireworks.o
obj-m += snd-fireworks.o
diff --git a/sound/firewire/fireworks/fireworks.c b/sound/firewire/fireworks/fireworks.c
index 52adce0..85dbad3 100644
--- a/sound/firewire/fireworks/fireworks.c
+++ b/sound/firewire/fireworks/fireworks.c
@@ -201,6 +201,12 @@ efw_probe(struct fw_unit *unit,
snd_efw_proc_init(efw);
+ if (efw->midi_out_ports || efw->midi_in_ports) {
+ err = snd_efw_create_midi_devices(efw);
+ if (err < 0)
+ goto error;
+ }
+
err = snd_card_register(card);
if (err < 0)
goto error;
diff --git a/sound/firewire/fireworks/fireworks.h b/sound/firewire/fireworks/fireworks.h
index 4d69c0d..0dfed97 100644
--- a/sound/firewire/fireworks/fireworks.h
+++ b/sound/firewire/fireworks/fireworks.h
@@ -22,6 +22,7 @@
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/info.h>
+#include <sound/rawmidi.h>
#include "../packets-buffer.h"
#include "../iso-resources.h"
@@ -189,6 +190,8 @@ void snd_efw_stream_destroy_duplex(struct snd_efw *efw);
void snd_efw_proc_init(struct snd_efw *efw);
+int snd_efw_create_midi_devices(struct snd_efw *efw);
+
#define SND_EFW_DEV_ENTRY(vendor, model) \
{ \
.match_flags = IEEE1394_MATCH_VENDOR_ID | \
diff --git a/sound/firewire/fireworks/fireworks_midi.c b/sound/firewire/fireworks/fireworks_midi.c
new file mode 100644
index 0000000..a950fd1
--- /dev/null
+++ b/sound/firewire/fireworks/fireworks_midi.c
@@ -0,0 +1,158 @@
+/*
+ * fireworks_midi.c - a part of driver for Fireworks based devices
+ *
+ * Copyright (c) 2009-2010 Clemens Ladisch
+ * Copyright (c) 2013 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+#include "fireworks.h"
+
+static int midi_capture_open(struct snd_rawmidi_substream *substream)
+{
+ struct snd_efw *efw = substream->rmidi->private_data;
+
+ efw->capture_substreams++;
+ return snd_efw_stream_start_duplex(efw, &efw->tx_stream, 0);
+}
+
+static int midi_playback_open(struct snd_rawmidi_substream *substream)
+{
+ struct snd_efw *efw = substream->rmidi->private_data;
+
+ efw->playback_substreams++;
+ return snd_efw_stream_start_duplex(efw, &efw->rx_stream, 0);
+}
+
+static int midi_capture_close(struct snd_rawmidi_substream *substream)
+{
+ struct snd_efw *efw = substream->rmidi->private_data;
+
+ efw->capture_substreams--;
+ snd_efw_stream_stop_duplex(efw);
+
+ return 0;
+}
+
+static int midi_playback_close(struct snd_rawmidi_substream *substream)
+{
+ struct snd_efw *efw = substream->rmidi->private_data;
+
+ efw->playback_substreams--;
+ snd_efw_stream_stop_duplex(efw);
+
+ return 0;
+}
+
+static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
+{
+ struct snd_efw *efw = substrm->rmidi->private_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&efw->lock, flags);
+
+ if (up)
+ amdtp_stream_midi_trigger(&efw->tx_stream,
+ substrm->number, substrm);
+ else
+ amdtp_stream_midi_trigger(&efw->tx_stream,
+ substrm->number, NULL);
+
+ spin_unlock_irqrestore(&efw->lock, flags);
+}
+
+static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
+{
+ struct snd_efw *efw = substrm->rmidi->private_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&efw->lock, flags);
+
+ if (up)
+ amdtp_stream_midi_trigger(&efw->rx_stream,
+ substrm->number, substrm);
+ else
+ amdtp_stream_midi_trigger(&efw->rx_stream,
+ substrm->number, NULL);
+
+ spin_unlock_irqrestore(&efw->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_efw *efw,
+ 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", efw->card->shortname, subs->number + 1);
+ }
+}
+
+int snd_efw_create_midi_devices(struct snd_efw *efw)
+{
+ struct snd_rawmidi *rmidi;
+ struct snd_rawmidi_str *str;
+ int err;
+
+ /* check the number of midi stream */
+ if ((efw->midi_in_ports > SND_EFW_MAX_MIDI_IN_PORTS) |
+ (efw->midi_out_ports > SND_EFW_MAX_MIDI_OUT_PORTS))
+ return -EIO;
+
+ /* create midi ports */
+ err = snd_rawmidi_new(efw->card, efw->card->driver, 0,
+ efw->midi_out_ports, efw->midi_in_ports,
+ &rmidi);
+ if (err < 0)
+ return err;
+
+ snprintf(rmidi->name, sizeof(rmidi->name),
+ "%s MIDI", efw->card->shortname);
+ rmidi->private_data = efw;
+
+ if (efw->midi_in_ports > 0) {
+ 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(efw, str);
+ }
+
+ if (efw->midi_out_ports > 0) {
+ 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(efw, str);
+
+ /*
+ * Fireworks ignores MIDI messages in greater than first 8 data
+ * blocks of an AMDTP packet.
+ */
+ efw->rx_stream.blocks_for_midi = 8;
+ }
+
+ if ((efw->midi_out_ports > 0) && (efw->midi_in_ports > 0))
+ rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
+
+ return 0;
+}
--
1.8.3.2
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