ALSA: bebob: Add MIDI interface

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 substream.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

5 files changed, 161 insertions, 1 deletions

diff --git a/sound/firewire/Kconfig b/sound/firewire/Kconfig
index 5539baac9a5d..708d3c81ef87 100644
--- a/sound/firewire/Kconfig
+++ b/sound/firewire/Kconfig
@@ -82,6 +82,7 @@ config SND_FIREWORKS
 config SND_BEBOB
         tristate "BridgeCo DM1000/DM1100/DM1500 with BeBoB firmware"
         select SND_FIREWIRE_LIB
+        select SND_RAWMIDI
         help
          Say Y here to include support for FireWire devices based
          on BridgeCo DM1000/DM1100/DM1500 with BeBoB firmware:
diff --git a/sound/firewire/bebob/Makefile b/sound/firewire/bebob/Makefile
index 757c40ef94df..1e39e591540b 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 0c3f1f6ab670..383df9a22004 100644
--- a/sound/firewire/bebob/bebob.c
+++ b/sound/firewire/bebob/bebob.c
@@ -164,6 +164,13 @@ 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_bebob_stream_init_duplex(bebob);
         if (err < 0)
                 goto error;
diff --git a/sound/firewire/bebob/bebob.h b/sound/firewire/bebob/bebob.h
index 1247cca04f63..0d53cff8a68d 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 000000000000..120a61b90c59
--- /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) 2013-2014 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;
+
+        atomic_inc(&bebob->capture_substreams);
+        return snd_bebob_stream_start_duplex(bebob, 0);
+}
+
+static int midi_playback_open(struct snd_rawmidi_substream *substream)
+{
+        struct snd_bebob *bebob = substream->rmidi->private_data;
+
+        atomic_inc(&bebob->playback_substreams);
+        return snd_bebob_stream_start_duplex(bebob, 0);
+}
+
+static int midi_capture_close(struct snd_rawmidi_substream *substream)
+{
+        struct snd_bebob *bebob = substream->rmidi->private_data;
+
+        atomic_dec(&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;
+
+        atomic_dec(&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;
+}