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ALSA: firewire-digi00x: add support of asynchronous transaction for outgoing MIDI messages to physical controls

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In previous commit, asynchronous transaction for incoming MIDI messages
from physical controls is supported. The physical controls may be
controlled by receiving MIDI messages at a certain address.

This commit supports asynchronous transaction for this purpose.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2015-10-11 12:30:18 +09:00 committed by Takashi Iwai
parent 3646a54acd
commit b47f525f76
2 changed files with 26 additions and 4 deletions
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29
sound/firewire/digi00x/digi00x-transaction.c
View File

@ -9,6 +9,18 @@
#include <sound/asound.h>
#include "digi00x.h"
static int fill_midi_message(struct snd_rawmidi_substream *substream, u8 *buf)
{
int bytes;
buf[0] = 0x80;
bytes = snd_rawmidi_transmit_peek(substream, buf + 1, 2);
if (bytes >= 0)
buf[3] = 0xc0 | bytes;
return bytes;
}
static void handle_midi_control(struct snd_dg00x *dg00x, __be32 *buf,
unsigned int length)
{
@ -102,15 +114,24 @@ int snd_dg00x_transaction_register(struct snd_dg00x *dg00x)
return err;
err = snd_dg00x_transaction_reregister(dg00x);
if (err < 0) {
fw_core_remove_address_handler(&dg00x->async_handler);
dg00x->async_handler.address_callback = NULL;
}
if (err < 0)
goto error;
err = snd_fw_async_midi_port_init(&dg00x->out_control, dg00x->unit,
DG00X_ADDR_BASE + DG00X_OFFSET_MMC,
4, fill_midi_message);
if (err < 0)
goto error;
return err;
error:
fw_core_remove_address_handler(&dg00x->async_handler);
dg00x->async_handler.address_callback = NULL;
return err;
}
void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x)
{
snd_fw_async_midi_port_destroy(&dg00x->out_control);
fw_core_remove_address_handler(&dg00x->async_handler);
}

1
sound/firewire/digi00x/digi00x.h
View File

@ -56,6 +56,7 @@ struct snd_dg00x {
/* For asynchronous MIDI controls. */
struct snd_rawmidi_substream *in_control;
struct snd_fw_async_midi_port out_control;
};
#define DG00X_ADDR_BASE 0xffffe0000000ull