ALSA: firewire-tascam: add support for outgoing MIDI messages by asynchronous transaction
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>
diff --git a/sound/firewire/tascam/tascam-transaction.c b/sound/firewire/tascam/tascam-transaction.c
index 853438d..6b74fb5 100644
--- a/sound/firewire/tascam/tascam-transaction.c
+++ b/sound/firewire/tascam/tascam-transaction.c
@@ -58,6 +58,83 @@
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 @@
.start = 0xffffe0000000ull,
.end = 0xffffe000ffffull,
};
+ unsigned int i;
int err;
/*
@@ -129,8 +207,20 @@
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 @@
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 @@
®, 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]);
}
diff --git a/sound/firewire/tascam/tascam.h b/sound/firewire/tascam/tascam.h
index b0e602b..c2f0c74 100644
--- a/sound/firewire/tascam/tascam.h
+++ b/sound/firewire/tascam/tascam.h
@@ -67,6 +67,14 @@
/* 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
