[alsa-devel] [PATCH 05/13] bebob: Add MIDI interface
Takashi Sakamoto
o-takashi at sakamocchi.jp
Sat Nov 23 07:09:17 CET 2013
This commit adds the functionality to capture/playback MIDI message. MIDI
message is multiplexed/demultiplexed into AMDTP stream.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/Kconfig | 1 +
sound/firewire/bebob/Makefile | 1 +
sound/firewire/bebob/bebob.c | 7 ++
sound/firewire/bebob/bebob.h | 3 +
sound/firewire/bebob/bebob_midi.c | 172 ++++++++++++++++++++++++++++++++++++++
5 files changed, 184 insertions(+)
create mode 100644 sound/firewire/bebob/bebob_midi.c
diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig
index 5349652..c7987a0 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -63,6 +63,7 @@ config SND_SCS1X
config SND_BEBOB
tristate "BridgeCo BeBoB chipset support"
+ select SND_RAWMIDI
select SND_FIREWIRE_LIB
help
Say Y here to include support for FireWire devices based
diff --git a/sound/firewire/bebob/Makefile b/sound/firewire/bebob/Makefile
index bec01cd..c7aeef7 100644
--- a/sound/firewire/bebob/Makefile
+++ b/sound/firewire/bebob/Makefile
@@ -1,3 +1,4 @@
snd-bebob-objs := bebob_command.o bebob_stream.o bebob_proc.o bebob_control.o \
+ bebob_midi.o \
bebob.o
obj-m += snd-bebob.o
diff --git a/sound/firewire/bebob/bebob.c b/sound/firewire/bebob/bebob.c
index 71a3896..89dc45b 100644
--- a/sound/firewire/bebob/bebob.c
+++ b/sound/firewire/bebob/bebob.c
@@ -177,6 +177,13 @@ snd_bebob_probe(struct fw_unit *unit,
if (err < 0)
goto error;
+ if ((bebob->midi_input_ports > 0) ||
+ (bebob->midi_output_ports > 0)) {
+ err = snd_bebob_create_midi_devices(bebob);
+ if (err < 0)
+ goto error;
+ }
+
err = snd_bebob_create_control_devices(bebob);
if (err < 0)
goto error;
diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h
index d87999e..2775a73 100644
--- a/sound/firewire/bebob/bebob.h
+++ b/sound/firewire/bebob/bebob.h
@@ -31,6 +31,7 @@
#include <sound/initval.h>
#include <sound/info.h>
#include <sound/control.h>
+#include <sound/rawmidi.h>
#include "../packets-buffer.h"
#include "../iso-resources.h"
@@ -153,6 +154,8 @@ void snd_bebob_proc_init(struct snd_bebob *bebob);
int snd_bebob_create_control_devices(struct snd_bebob *bebob);
+int snd_bebob_create_midi_devices(struct snd_bebob *bebob);
+
#define SND_BEBOB_DEV_ENTRY(vendor, model) \
{ \
.match_flags = IEEE1394_MATCH_VENDOR_ID | \
diff --git a/sound/firewire/bebob/bebob_midi.c b/sound/firewire/bebob/bebob_midi.c
new file mode 100644
index 0000000..56c7115
--- /dev/null
+++ b/sound/firewire/bebob/bebob_midi.c
@@ -0,0 +1,172 @@
+/*
+ * bebob_midi.c - a part of driver for BeBoB based devices
+ * Copyright (c) 2013 Takashi Sakamoto
+ *
+ * This driver is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2.
+ *
+ * This driver is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this driver; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "bebob.h"
+
+/*
+ * According to MMA/AMEI-027, MIDI stream is multiplexed with PCM stream in
+ * AMDTP packet. The data rate of MIDI message is much less than PCM so there
+ * is a little problem to suspend MIDI streams.
+ */
+static int midi_capture_open(struct snd_rawmidi_substream *substream)
+{
+ struct snd_bebob *bebob = substream->rmidi->private_data;
+ int err;
+
+ err = snd_bebob_stream_start_duplex(bebob, &bebob->tx_stream, 0);
+ if (err < 0)
+ goto end;
+
+ amdtp_stream_midi_add(&bebob->tx_stream, substream);
+end:
+ return err;
+}
+
+static int midi_playback_open(struct snd_rawmidi_substream *substream)
+{
+ struct snd_bebob *bebob = substream->rmidi->private_data;
+ int err;
+
+ err = snd_bebob_stream_start_duplex(bebob, &bebob->rx_stream, 0);
+ if (err < 0)
+ goto end;
+
+ amdtp_stream_midi_add(&bebob->rx_stream, substream);
+end:
+ return err;
+}
+
+static int midi_capture_close(struct snd_rawmidi_substream *substream)
+{
+ struct snd_bebob *bebob = substream->rmidi->private_data;
+
+ amdtp_stream_midi_remove(&bebob->tx_stream, substream);
+ snd_bebob_stream_stop_duplex(bebob);
+
+ return 0;
+}
+
+static int midi_playback_close(struct snd_rawmidi_substream *substream)
+{
+ struct snd_bebob *bebob = substream->rmidi->private_data;
+
+ amdtp_stream_midi_remove(&bebob->rx_stream, substream);
+ snd_bebob_stream_stop_duplex(bebob);
+
+ return 0;
+}
+
+static void midi_capture_trigger(struct snd_rawmidi_substream *substrm, int up)
+{
+ struct snd_bebob *bebob = substrm->rmidi->private_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bebob->lock, flags);
+
+ if (up)
+ __set_bit(substrm->number, &bebob->tx_stream.midi_triggered);
+ else
+ __clear_bit(substrm->number, &bebob->tx_stream.midi_triggered);
+
+ spin_unlock_irqrestore(&bebob->lock, flags);
+
+ return;
+}
+
+static void midi_playback_trigger(struct snd_rawmidi_substream *substrm, int up)
+{
+ struct snd_bebob *bebob = substrm->rmidi->private_data;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bebob->lock, flags);
+
+ if (up)
+ __set_bit(substrm->number, &bebob->rx_stream.midi_triggered);
+ else
+ __clear_bit(substrm->number, &bebob->rx_stream.midi_triggered);
+
+ spin_unlock_irqrestore(&bebob->lock, flags);
+
+ return;
+}
+
+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_bebob *bebob,
+ 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", bebob->card->shortname, subs->number + 1);
+ }
+}
+
+int snd_bebob_create_midi_devices(struct snd_bebob *bebob)
+{
+ struct snd_rawmidi *rmidi;
+ struct snd_rawmidi_str *str;
+ int err;
+
+ /* create midi ports */
+ err = snd_rawmidi_new(bebob->card, bebob->card->driver, 0,
+ bebob->midi_output_ports, bebob->midi_input_ports,
+ &rmidi);
+ if (err < 0)
+ return err;
+
+ snprintf(rmidi->name, sizeof(rmidi->name),
+ "%s MIDI", bebob->card->shortname);
+ rmidi->private_data = bebob;
+
+ if (bebob->midi_input_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(bebob, str);
+ }
+
+ if (bebob->midi_output_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(bebob, str);
+ }
+
+ if ((bebob->midi_output_ports > 0) && (bebob->midi_input_ports > 0))
+ rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
+
+ return 0;
+}
--
1.8.3.2
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