[alsa-devel] [PATCH 33/44] bebob: Add MIDI interface
Takashi Sakamoto
o-takashi at sakamocchi.jp
Fri Mar 21 12:10:18 CET 2014
This commit adds a functionality to capture/playback MIDI messages.
When no AMDTP streams are running, this module starts AMDTP stream at current
sampling rate for MIDI stream.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/Kconfig | 1 +
sound/firewire/bebob/Makefile | 3 +-
sound/firewire/bebob/bebob.c | 7 ++
sound/firewire/bebob/bebob.h | 3 +
sound/firewire/bebob/bebob_midi.c | 148 ++++++++++++++++++++++++++++++++++++++
5 files changed, 161 insertions(+), 1 deletion(-)
create mode 100644 sound/firewire/bebob/bebob_midi.c
diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig
index 9027b23..8081ca1 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -82,6 +82,7 @@ config SND_FIREWORKS
config SND_BEBOB
tristate "BridgeCo DM1000/1500 with BeBoB firmware"
select SND_FIREWIRE_LIB
+ select SND_RAWMIDI
help
Say Y here to include support for FireWire devices based
on BridgeCo DM1000/1500 with BeBoB firmware:
diff --git a/sound/firewire/bebob/Makefile b/sound/firewire/bebob/Makefile
index 757c40e..1e39e59 100644
--- a/sound/firewire/bebob/Makefile
+++ b/sound/firewire/bebob/Makefile
@@ -1,2 +1,3 @@
-snd-bebob-objs := bebob_command.o bebob_stream.o bebob_proc.o bebob.o
+snd-bebob-objs := bebob_command.o bebob_stream.o bebob_proc.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 a4f8a29..75abb26 100644
--- a/sound/firewire/bebob/bebob.c
+++ b/sound/firewire/bebob/bebob.c
@@ -169,6 +169,13 @@ bebob_probe(struct fw_unit *unit,
snd_bebob_proc_init(bebob);
+ 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_card_register(card);
if (err < 0)
goto error;
diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h
index e641e90..ba76026 100644
--- a/sound/firewire/bebob/bebob.h
+++ b/sound/firewire/bebob/bebob.h
@@ -21,6 +21,7 @@
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/info.h>
+#include <sound/rawmidi.h>
#include "../lib.h"
#include "../fcp.h"
@@ -174,6 +175,8 @@ void snd_bebob_stream_destroy_duplex(struct snd_bebob *bebob);
void snd_bebob_proc_init(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..9312b34
--- /dev/null
+++ b/sound/firewire/bebob/bebob_midi.c
@@ -0,0 +1,148 @@
+/*
+ * bebob_midi.c - a part of driver for BeBoB based devices
+ *
+ * Copyright (c) 2013 Takashi Sakamoto
+ *
+ * Licensed under the terms of the GNU General Public License, version 2.
+ */
+
+#include "bebob.h"
+
+static int midi_capture_open(struct snd_rawmidi_substream *substream)
+{
+ struct snd_bebob *bebob = substream->rmidi->private_data;
+
+ bebob->capture_substreams++;
+ return snd_bebob_stream_start_duplex(bebob, &bebob->tx_stream, 0);
+}
+
+static int midi_playback_open(struct snd_rawmidi_substream *substream)
+{
+ struct snd_bebob *bebob = substream->rmidi->private_data;
+
+ bebob->playback_substreams++;
+ return snd_bebob_stream_start_duplex(bebob, &bebob->rx_stream, 0);
+}
+
+static int midi_capture_close(struct snd_rawmidi_substream *substream)
+{
+ struct snd_bebob *bebob = substream->rmidi->private_data;
+
+ bebob->capture_substreams--;
+ 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;
+
+ bebob->playback_substreams--;
+ 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)
+ amdtp_stream_midi_trigger(&bebob->tx_stream,
+ substrm->number, substrm);
+ else
+ amdtp_stream_midi_trigger(&bebob->tx_stream,
+ substrm->number, NULL);
+
+ spin_unlock_irqrestore(&bebob->lock, flags);
+}
+
+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)
+ amdtp_stream_midi_trigger(&bebob->rx_stream,
+ substrm->number, substrm);
+ else
+ amdtp_stream_midi_trigger(&bebob->rx_stream,
+ substrm->number, NULL);
+
+ spin_unlock_irqrestore(&bebob->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_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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