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ALSA: fireface: add protocol-specific operation to fill transaction buffer with MIDI messages

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Between former and latter models, content of asynchronous transaction
for MIDI messages from driver to device is different.

This commit is a preparation to support latter models. A protocol-specific
operation is added to encode MIDI messages to the transaction.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto
2019-01-22 22:17:04 +09:00
committed by Takashi Iwai
parent 481e09ac9a
commit 82b6297b44
3 changed files with 38 additions and 19 deletions
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23
sound/firewire/fireface/ff-protocol-former.c
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@@ -263,6 +263,27 @@ static void former_dump_status(struct snd_ff *ff,
dump_sync_status(ff, buffer);
}
static int former_fill_midi_msg(struct snd_ff *ff,
struct snd_rawmidi_substream *substream,
unsigned int port)
{
u8 *buf = (u8 *)ff->msg_buf[port];
int len;
int i;
len = snd_rawmidi_transmit_peek(substream, buf,
SND_FF_MAXIMIM_MIDI_QUADS);
if (len <= 0)
return len;
// One quadlet includes one byte.
for (i = len - 1; i >= 0; --i)
ff->msg_buf[port][i] = cpu_to_le32(buf[i]);
ff->rx_bytes[port] = len;
return len;
}
#define FF800_STF 0x0000fc88f000
#define FF800_RX_PACKET_FORMAT 0x0000fc88f004
#define FF800_ALLOC_TX_STREAM 0x0000fc88f008
@@ -392,6 +413,7 @@ static void ff800_handle_midi_msg(struct snd_ff *ff, unsigned int offset,
const struct snd_ff_protocol snd_ff_protocol_ff800 = {
.handle_midi_msg = ff800_handle_midi_msg,
.fill_midi_msg = former_fill_midi_msg,
.get_clock = former_get_clock,
.switch_fetching_mode = former_switch_fetching_mode,
.begin_session = ff800_begin_session,
@@ -543,6 +565,7 @@ static void ff400_handle_midi_msg(struct snd_ff *ff, unsigned int offset,
const struct snd_ff_protocol snd_ff_protocol_ff400 = {
.handle_midi_msg = ff400_handle_midi_msg,
.fill_midi_msg = former_fill_midi_msg,
.get_clock = former_get_clock,
.switch_fetching_mode = former_switch_fetching_mode,
.begin_session = ff400_begin_session,