Commit ff2c293e authored by Takashi Sakamoto's avatar Takashi Sakamoto Committed by Takashi Iwai
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ALSA: fireface: add support for MIDI functionality



In previous commit, fireface driver supports unique transaction mechanism
for MIDI feature. This commit adds MIDI functionality for userspace
applications.

As I wrote in a followed commit, user space applications get some
requirement from this driver. It should not touch a register to which
units transmit MIDI messages. It should configure a register in which
MIDI transmission is controlled.
Signed-off-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 19174295
snd-fireface-objs := ff.o ff-transaction.o
snd-fireface-objs := ff.o ff-transaction.o ff-midi.o
obj-$(CONFIG_SND_FIREFACE) += snd-fireface.o
/*
* ff-midi.c - a part of driver for RME Fireface series
*
* Copyright (c) 2015-2017 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include "ff.h"
static int midi_capture_open(struct snd_rawmidi_substream *substream)
{
/* Do nothing. */
return 0;
}
static int midi_playback_open(struct snd_rawmidi_substream *substream)
{
struct snd_ff *ff = substream->rmidi->private_data;
/* Initialize internal status. */
ff->running_status[substream->number] = 0;
ff->rx_midi_error[substream->number] = false;
ACCESS_ONCE(ff->rx_midi_substreams[substream->number]) = substream;
return 0;
}
static int midi_capture_close(struct snd_rawmidi_substream *substream)
{
/* Do nothing. */
return 0;
}
static int midi_playback_close(struct snd_rawmidi_substream *substream)
{
struct snd_ff *ff = substream->rmidi->private_data;
cancel_work_sync(&ff->rx_midi_work[substream->number]);
ACCESS_ONCE(ff->rx_midi_substreams[substream->number]) = NULL;
return 0;
}
static void midi_capture_trigger(struct snd_rawmidi_substream *substream,
int up)
{
struct snd_ff *ff = substream->rmidi->private_data;
unsigned long flags;
spin_lock_irqsave(&ff->lock, flags);
if (up)
ACCESS_ONCE(ff->tx_midi_substreams[substream->number]) =
substream;
else
ACCESS_ONCE(ff->tx_midi_substreams[substream->number]) = NULL;
spin_unlock_irqrestore(&ff->lock, flags);
}
static void midi_playback_trigger(struct snd_rawmidi_substream *substream,
int up)
{
struct snd_ff *ff = substream->rmidi->private_data;
unsigned long flags;
spin_lock_irqsave(&ff->lock, flags);
if (up || !ff->rx_midi_error[substream->number])
schedule_work(&ff->rx_midi_work[substream->number]);
spin_unlock_irqrestore(&ff->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_rawmidi_str *stream,
const char *const name)
{
struct snd_rawmidi_substream *substream;
list_for_each_entry(substream, &stream->substreams, list) {
snprintf(substream->name, sizeof(substream->name),
"%s MIDI %d", name, substream->number + 1);
}
}
int snd_ff_create_midi_devices(struct snd_ff *ff)
{
struct snd_rawmidi *rmidi;
struct snd_rawmidi_str *stream;
int err;
err = snd_rawmidi_new(ff->card, ff->card->driver, 0,
ff->spec->midi_out_ports, ff->spec->midi_in_ports,
&rmidi);
if (err < 0)
return err;
snprintf(rmidi->name, sizeof(rmidi->name),
"%s MIDI", ff->card->shortname);
rmidi->private_data = ff;
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
&midi_capture_ops);
stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT];
set_midi_substream_names(stream, ff->card->shortname);
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
&midi_playback_ops);
stream = &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT];
set_midi_substream_names(stream, ff->card->shortname);
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX;
return 0;
}
......@@ -61,6 +61,10 @@ static void do_registration(struct work_struct *work)
name_card(ff);
err = snd_ff_create_midi_devices(ff);
if (err < 0)
goto error;
err = snd_card_register(ff->card);
if (err < 0)
goto error;
......@@ -91,6 +95,7 @@ static int snd_ff_probe(struct fw_unit *unit,
dev_set_drvdata(&unit->device, ff);
mutex_init(&ff->mutex);
spin_lock_init(&ff->lock);
ff->spec = (const struct snd_ff_spec *)entry->driver_data;
......
......@@ -47,6 +47,7 @@ struct snd_ff {
struct snd_card *card;
struct fw_unit *unit;
struct mutex mutex;
spinlock_t lock;
bool registered;
struct delayed_work dwork;
......@@ -98,4 +99,6 @@ int snd_ff_transaction_register(struct snd_ff *ff);
int snd_ff_transaction_reregister(struct snd_ff *ff);
void snd_ff_transaction_unregister(struct snd_ff *ff);
int snd_ff_create_midi_devices(struct snd_ff *ff);
#endif
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