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 --- sound/firewire/tascam/tascam-transaction.c | 95 +++++++++++++++++++++++++++++- sound/firewire/tascam/tascam.h | 8 +++ 2 files changed, 102 insertions(+), 1 deletion(-)
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 @@ 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;
/* @@ -129,9 +207,21 @@ 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; }
/* At bus reset, these registers are cleared. */ @@ -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) ®, 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 @@ 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