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ALSA: firewire-tascam: add support for outgoing MIDI messages by asynchronous transaction

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TASCAM FireWire series use asynchronous transaction to receive MIDI
messages. The transaction should be sent to a certain address.

This commit supports the outgoing MIDI messages. The messages in the
transaction includes some quirks:
 * One MIDI message is transferred in one quadlet transaction, except for
   system exclusives.
 * MIDI running status is not allowed, thus transactions always include
   status byte.
 * The basic data format is the same as transferring MIDI messages
   supported in previous commit.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2015-10-12 19:10:22 +09:00 committed by Takashi Iwai
parent 107cc0129a
commit 3beab0f844
2 changed files with 102 additions and 1 deletions
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95
sound/firewire/tascam/tascam-transaction.c
View File

@ -58,6 +58,83 @@ static inline int calculate_message_bytes(u8 status)
return -EINVAL;
}
static int fill_message(struct snd_rawmidi_substream *substream, u8 *buf)
{
struct snd_tscm *tscm = substream->rmidi->private_data;
unsigned int port = substream->number;
unsigned int len;
unsigned int i;
u8 status;
int consume;
buf[0] = buf[1] = buf[2] = buf[3] = 0x00;
len = snd_rawmidi_transmit_peek(substream, buf + 1, 3);
if (len == 0)
return 0;
/* On exclusive message. */
if (tscm->on_sysex[port]) {
/* Seek the end of exclusives. */
for (i = 1; i < 4 || i < len; ++i) {
if (buf[i] == 0xf7) {
tscm->on_sysex[port] = false;
break;
}
}
/* At the end of exclusive message, use label 0x07. */
if (!tscm->on_sysex[port]) {
len = i;
buf[0] = (port << 4) | 0x07;
/* During exclusive message, use label 0x04. */
} else if (len == 3) {
buf[0] = (port << 4) | 0x04;
/* We need to fill whole 3 bytes. Go to next change. */
} else {
len = 0;
}
} else {
/* The beginning of exclusives. */
if (buf[1] == 0xf0) {
/* Transfer it in next chance in another condition. */
tscm->on_sysex[port] = true;
return 0;
} else {
/* On running-status. */
if ((buf[1] & 0x80) != 0x80)
status = tscm->running_status[port];
else
status = buf[1];
/* Calculate consume bytes. */
consume = calculate_message_bytes(status);
if (consume <= 0)
return 0;
/* On running-status. */
if ((buf[1] & 0x80) != 0x80) {
buf[3] = buf[2];
buf[2] = buf[1];
buf[1] = tscm->running_status[port];
consume--;
} else {
tscm->running_status[port] = buf[1];
}
/* Confirm length. */
if (len < consume)
return 0;
if (len > consume)
len = consume;
}
buf[0] = (port << 4) | (buf[1] >> 4);
}
return len;
}
static void handle_midi_tx(struct fw_card *card, struct fw_request *request,
int tcode, int destination, int source,
int generation, unsigned long long offset,
@ -111,6 +188,7 @@ int snd_tscm_transaction_register(struct snd_tscm *tscm)
.start = 0xffffe0000000ull,
.end = 0xffffe000ffffull,
};
unsigned int i;
int err;
/*
@ -129,8 +207,20 @@ int snd_tscm_transaction_register(struct snd_tscm *tscm)
err = snd_tscm_transaction_reregister(tscm);
if (err < 0)
fw_core_remove_address_handler(&tscm->async_handler);
goto error;
for (i = 0; i < TSCM_MIDI_OUT_PORT_MAX; i++) {
err = snd_fw_async_midi_port_init(
&tscm->out_ports[i], tscm->unit,
TSCM_ADDR_BASE + TSCM_OFFSET_MIDI_RX_QUAD,
4, fill_message);
if (err < 0)
goto error;
}
return err;
error:
fw_core_remove_address_handler(&tscm->async_handler);
return err;
}
@ -167,6 +257,7 @@ int snd_tscm_transaction_reregister(struct snd_tscm *tscm)
void snd_tscm_transaction_unregister(struct snd_tscm *tscm)
{
__be32 reg;
unsigned int i;
/* Turn off messaging. */
reg = cpu_to_be32(0x00000000);
@ -183,4 +274,6 @@ void snd_tscm_transaction_unregister(struct snd_tscm *tscm)
&reg, sizeof(reg), 0);
fw_core_remove_address_handler(&tscm->async_handler);
for (i = 0; i < TSCM_MIDI_OUT_PORT_MAX; i++)
snd_fw_async_midi_port_destroy(&tscm->out_ports[i]);
}

8
sound/firewire/tascam/tascam.h
View File

@ -67,6 +67,14 @@ struct snd_tscm {
/* For MIDI message incoming transactions. */
struct fw_address_handler async_handler;
struct snd_rawmidi_substream *tx_midi_substreams[TSCM_MIDI_IN_PORT_MAX];
/* For MIDI message outgoing transactions. */
struct snd_fw_async_midi_port out_ports[TSCM_MIDI_OUT_PORT_MAX];
u8 running_status[TSCM_MIDI_OUT_PORT_MAX];
bool on_sysex[TSCM_MIDI_OUT_PORT_MAX];
/* For control messages. */
struct snd_firewire_tascam_status *status;
};
#define TSCM_ADDR_BASE 0xffff00000000ull