ALSA: fireworks: Add MIDI interface

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.

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

4 files changed, 158 insertions, 1 deletions

diff --git a/sound/firewire/fireworks/Makefile b/sound/firewire/fireworks/Makefile
index 52bd15e285b0..a2cecc6d8a4a 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 311e4a6ef0a6..9204c7c56513 100644
--- a/sound/firewire/fireworks/fireworks.c
+++ b/sound/firewire/fireworks/fireworks.c
@@ -226,6 +226,12 @@ 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_efw_stream_init_duplex(efw);
         if (err < 0)
                 goto error;
diff --git a/sound/firewire/fireworks/fireworks.h b/sound/firewire/fireworks/fireworks.h
index eef7ad89fd4e..d1819696754d 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"
@@ -198,6 +199,8 @@ 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 000000000000..cbf34e99237f
--- /dev/null
+++ b/sound/firewire/fireworks/fireworks_midi.c
@@ -0,0 +1,147 @@
+/*
+ * fireworks_midi.c - a part of driver for Fireworks based devices
+ *
+ * Copyright (c) 2009-2010 Clemens Ladisch
+ * Copyright (c) 2013-2014 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;
+
+        atomic_inc(&efw->capture_substreams);
+        return snd_efw_stream_start_duplex(efw, 0);
+}
+
+static int midi_playback_open(struct snd_rawmidi_substream *substream)
+{
+        struct snd_efw *efw = substream->rmidi->private_data;
+
+        atomic_inc(&efw->playback_substreams);
+        return snd_efw_stream_start_duplex(efw, 0);
+}
+
+static int midi_capture_close(struct snd_rawmidi_substream *substream)
+{
+        struct snd_efw *efw = substream->rmidi->private_data;
+
+        atomic_dec(&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;
+
+        atomic_dec(&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;
+
+        /* 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);
+        }
+
+        if ((efw->midi_out_ports > 0) && (efw->midi_in_ports > 0))
+                rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
+
+        return 0;
+}