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Commit 3beab0f8 authored by Takashi Sakamoto's avatar Takashi Sakamoto Committed by Takashi Iwai
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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: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 107cc012

sound/firewire/tascam/tascam-transaction.c

+94 −1
Original line number Diff line number Diff line
@@ -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]);

}

sound/firewire/tascam/tascam.h

+8 −0
Original line number Diff line number Diff line
@@ -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