sound/firewire/oxfw/oxfw-scs1x.c - kernel/msm-4.19 - Gitiles

 /*
  * oxfw-scs1x.c - a part of driver for OXFW970/971 based devices
  *
  * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
  * Copyright (c) 2015 Takashi Sakamoto <o-takashi@sakamocchi.jp>
  *
  * Licensed under the terms of the GNU General Public License, version 2.
  */

 #include "oxfw.h"

 #define HSS1394_ADDRESS			0xc007dedadadaULL
 #define HSS1394_MAX_PACKET_SIZE		64
 #define HSS1394_TAG_USER_DATA		0x00
 #define HSS1394_TAG_CHANGE_ADDRESS	0xf1

 struct fw_scs1x {
 	struct fw_address_handler hss_handler;
 	u8 input_escape_count;
 	struct snd_rawmidi_substream *input;

 	/* For MIDI playback. */
 	struct snd_rawmidi_substream *output;
 	bool output_idle;
 	u8 output_status;
 	u8 output_bytes;
 	bool output_escaped;
 	bool output_escape_high_nibble;
 	struct work_struct work;
 	wait_queue_head_t idle_wait;
 	u8 buffer[HSS1394_MAX_PACKET_SIZE];
 	bool transaction_running;
 	struct fw_transaction transaction;
 	unsigned int transaction_bytes;
 	bool error;
 	struct fw_device *fw_dev;
 };

 static const u8 sysex_escape_prefix[] = {
 	0xf0,			/* SysEx begin */
 	0x00, 0x01, 0x60,	/* Stanton DJ */
 	0x48, 0x53, 0x53,	/* "HSS" */
 };

 static void midi_input_escaped_byte(struct snd_rawmidi_substream *stream,
 				    u8 byte)
 {
 	u8 nibbles[2];

 	nibbles[0] = byte >> 4;
 	nibbles[1] = byte & 0x0f;
 	snd_rawmidi_receive(stream, nibbles, 2);
 }

 static void midi_input_byte(struct fw_scs1x *scs,
 			    struct snd_rawmidi_substream *stream, u8 byte)
 {
 	const u8 eox = 0xf7;

 	if (scs->input_escape_count > 0) {
 		midi_input_escaped_byte(stream, byte);
 		scs->input_escape_count--;
 		if (scs->input_escape_count == 0)
 			snd_rawmidi_receive(stream, &eox, sizeof(eox));
 	} else if (byte == 0xf9) {
 		snd_rawmidi_receive(stream, sysex_escape_prefix,
 				    ARRAY_SIZE(sysex_escape_prefix));
 		midi_input_escaped_byte(stream, 0x00);
 		midi_input_escaped_byte(stream, 0xf9);
 		scs->input_escape_count = 3;
 	} else {
 		snd_rawmidi_receive(stream, &byte, 1);
 	}
 }

 static void midi_input_packet(struct fw_scs1x *scs,
 			      struct snd_rawmidi_substream *stream,
 			      const u8 *data, unsigned int bytes)
 {
 	unsigned int i;
 	const u8 eox = 0xf7;

 	if (data[0] == HSS1394_TAG_USER_DATA) {
 		for (i = 1; i < bytes; ++i)
 			midi_input_byte(scs, stream, data[i]);
 	} else {
 		snd_rawmidi_receive(stream, sysex_escape_prefix,
 				    ARRAY_SIZE(sysex_escape_prefix));
 		for (i = 0; i < bytes; ++i)
 			midi_input_escaped_byte(stream, data[i]);
 		snd_rawmidi_receive(stream, &eox, sizeof(eox));
 	}
 }

 static void handle_hss(struct fw_card *card, struct fw_request *request,
 		       int tcode, int destination, int source, int generation,
 		       unsigned long long offset, void *data, size_t length,
 		       void *callback_data)
 {
 	struct fw_scs1x *scs = callback_data;
 	struct snd_rawmidi_substream *stream;
 	int rcode;

 	if (offset != scs->hss_handler.offset) {
 		rcode = RCODE_ADDRESS_ERROR;
 		goto end;
 	}
 	if (tcode != TCODE_WRITE_QUADLET_REQUEST &&
 	    tcode != TCODE_WRITE_BLOCK_REQUEST) {
 		rcode = RCODE_TYPE_ERROR;
 		goto end;
 	}

 	if (length >= 1) {
 		stream = ACCESS_ONCE(scs->input);
 		if (stream)
 			midi_input_packet(scs, stream, data, length);
 	}

 	rcode = RCODE_COMPLETE;
 end:
 	fw_send_response(card, request, rcode);
 }

 static void scs_write_callback(struct fw_card *card, int rcode,
 			       void *data, size_t length, void *callback_data)
 {
 	struct fw_scs1x *scs = callback_data;

 	if (!rcode_is_permanent_error(rcode)) {
 		/* Don't retry for this data. */
 		if (rcode == RCODE_COMPLETE)
 			scs->transaction_bytes = 0;
 	} else {
 		scs->error = true;
 	}

 	scs->transaction_running = false;
 	schedule_work(&scs->work);
 }

 static bool is_valid_running_status(u8 status)
 {
 	return status >= 0x80 && status <= 0xef;
 }

 static bool is_one_byte_cmd(u8 status)
 {
 	return status == 0xf6 ||
 	       status >= 0xf8;
 }

 static bool is_two_bytes_cmd(u8 status)
 {
 	return (status >= 0xc0 && status <= 0xdf) ||
 	       status == 0xf1 ||
 	       status == 0xf3;
 }

 static bool is_three_bytes_cmd(u8 status)
 {
 	return (status >= 0x80 && status <= 0xbf) ||
 	       (status >= 0xe0 && status <= 0xef) ||
 	       status == 0xf2;
 }

 static bool is_invalid_cmd(u8 status)
 {
 	return status == 0xf4 ||
 	       status == 0xf5 ||
 	       status == 0xf9 ||
 	       status == 0xfd;
 }

 static void scs_output_work(struct work_struct *work)
 {
 	struct fw_scs1x *scs = container_of(work, struct fw_scs1x, work);
 	struct snd_rawmidi_substream *stream;
 	unsigned int i;
 	u8 byte;
 	int generation;

 	if (scs->transaction_running)
 		return;

 	stream = ACCESS_ONCE(scs->output);
 	if (!stream || scs->error) {
 		scs->output_idle = true;
 		wake_up(&scs->idle_wait);
 		return;
 	}

 	if (scs->transaction_bytes > 0)
 		goto retry;

 	i = scs->output_bytes;
 	for (;;) {
 		if (snd_rawmidi_transmit(stream, &byte, 1) != 1) {
 			scs->output_bytes = i;
 			scs->output_idle = true;
 			wake_up(&scs->idle_wait);
 			return;
 		}
 		/*
 		 * Convert from real MIDI to what I think the device expects (no
 		 * running status, one command per packet, unescaped SysExs).
 		 */
 		if (scs->output_escaped && byte < 0x80) {
 			if (scs->output_escape_high_nibble) {
 				if (i < HSS1394_MAX_PACKET_SIZE) {
 					scs->buffer[i] = byte << 4;
 					scs->output_escape_high_nibble = false;
 				}
 			} else {
 				scs->buffer[i++] |= byte & 0x0f;
 				scs->output_escape_high_nibble = true;
 			}
 		} else if (byte < 0x80) {
 			if (i == 1) {
 				if (!is_valid_running_status(
 							scs->output_status))
 					continue;
 				scs->buffer[0] = HSS1394_TAG_USER_DATA;
 				scs->buffer[i++] = scs->output_status;
 			}
 			scs->buffer[i++] = byte;
 			if ((i == 3 && is_two_bytes_cmd(scs->output_status)) ||
 			    (i == 4 && is_three_bytes_cmd(scs->output_status)))
 				break;
 			if (i == 1 + ARRAY_SIZE(sysex_escape_prefix) &&
 			    !memcmp(scs->buffer + 1, sysex_escape_prefix,
 				    ARRAY_SIZE(sysex_escape_prefix))) {
 				scs->output_escaped = true;
 				scs->output_escape_high_nibble = true;
 				i = 0;
 			}
 			if (i >= HSS1394_MAX_PACKET_SIZE)
 				i = 1;
 		} else if (byte == 0xf7) {
 			if (scs->output_escaped) {
 				if (i >= 1 && scs->output_escape_high_nibble &&
 				    scs->buffer[0] !=
 						HSS1394_TAG_CHANGE_ADDRESS)
 					break;
 			} else {
 				if (i > 1 && scs->output_status == 0xf0) {
 					scs->buffer[i++] = 0xf7;
 					break;
 				}
 			}
 			i = 1;
 			scs->output_escaped = false;
 		} else if (!is_invalid_cmd(byte) && byte < 0xf8) {
 			i = 1;
 			scs->buffer[0] = HSS1394_TAG_USER_DATA;
 			scs->buffer[i++] = byte;
 			scs->output_status = byte;
 			scs->output_escaped = false;
 			if (is_one_byte_cmd(byte))
 				break;
 		}
 	}
 	scs->output_bytes = 1;
 	scs->output_escaped = false;

 	scs->transaction_bytes = i;
 retry:
 	scs->transaction_running = true;
 	generation = scs->fw_dev->generation;
 	smp_rmb(); /* node_id vs. generation */
 	fw_send_request(scs->fw_dev->card, &scs->transaction,
 			TCODE_WRITE_BLOCK_REQUEST, scs->fw_dev->node_id,
 			generation, scs->fw_dev->max_speed, HSS1394_ADDRESS,
 			scs->buffer, scs->transaction_bytes,
 			scs_write_callback, scs);
 }

 static int midi_capture_open(struct snd_rawmidi_substream *stream)
 {
 	return 0;
 }

 static int midi_capture_close(struct snd_rawmidi_substream *stream)
 {
 	return 0;
 }

 static void midi_capture_trigger(struct snd_rawmidi_substream *stream, int up)
 {
 	struct fw_scs1x *scs = stream->rmidi->private_data;

 	if (up) {
 		scs->input_escape_count = 0;
 		ACCESS_ONCE(scs->input) = stream;
 	} else {
 		ACCESS_ONCE(scs->input) = NULL;
 	}
 }

 static const struct snd_rawmidi_ops midi_capture_ops = {
 	.open    = midi_capture_open,
 	.close   = midi_capture_close,
 	.trigger = midi_capture_trigger,
 };

 static int midi_playback_open(struct snd_rawmidi_substream *stream)
 {
 	return 0;
 }

 static int midi_playback_close(struct snd_rawmidi_substream *stream)
 {
 	return 0;
 }

 static void midi_playback_trigger(struct snd_rawmidi_substream *stream, int up)
 {
 	struct fw_scs1x *scs = stream->rmidi->private_data;

 	if (up) {
 		scs->output_status = 0;
 		scs->output_bytes = 1;
 		scs->output_escaped = false;
 		scs->output_idle = false;
 		scs->transaction_bytes = 0;
 		scs->error = false;

 		ACCESS_ONCE(scs->output) = stream;
 		schedule_work(&scs->work);
 	} else {
 		ACCESS_ONCE(scs->output) = NULL;
 	}
 }
 static void midi_playback_drain(struct snd_rawmidi_substream *stream)
 {
 	struct fw_scs1x *scs = stream->rmidi->private_data;

 	wait_event(scs->idle_wait, scs->output_idle);
 }

 static int register_address(struct snd_oxfw *oxfw)
 {
 	struct fw_scs1x *scs = oxfw->spec;
 	__be64 data;

 	data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) |
 			    scs->hss_handler.offset);
 	return snd_fw_transaction(oxfw->unit, TCODE_WRITE_BLOCK_REQUEST,
 				  HSS1394_ADDRESS, &data, sizeof(data), 0);
 }

 static void remove_scs1x(struct snd_rawmidi *rmidi)
 {
 	struct fw_scs1x *scs = rmidi->private_data;

 	fw_core_remove_address_handler(&scs->hss_handler);
 }

 void snd_oxfw_scs1x_update(struct snd_oxfw *oxfw)
 {
 	register_address(oxfw);
 }

 int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw)
 {
 	static const struct snd_rawmidi_ops midi_playback_ops = {
 		.open    = midi_playback_open,
 		.close   = midi_playback_close,
 		.trigger = midi_playback_trigger,
 		.drain   = midi_playback_drain,
 	};
 	struct snd_rawmidi *rmidi;
 	struct fw_scs1x *scs;
 	int err;

 	scs = kzalloc(sizeof(struct fw_scs1x), GFP_KERNEL);
 	if (scs == NULL)
 		return -ENOMEM;
 	scs->fw_dev = fw_parent_device(oxfw->unit);
 	oxfw->spec = scs;

 	/* Allocate own handler for imcoming asynchronous transaction. */
 	scs->hss_handler.length = HSS1394_MAX_PACKET_SIZE;
 	scs->hss_handler.address_callback = handle_hss;
 	scs->hss_handler.callback_data = scs;
 	err = fw_core_add_address_handler(&scs->hss_handler,
 					  &fw_high_memory_region);
 	if (err < 0)
 		return err;

 	err = register_address(oxfw);
 	if (err < 0)
 		goto err_allocated;

 	/* Use unique name for backward compatibility to scs1x module. */
 	err = snd_rawmidi_new(oxfw->card, "SCS.1x", 0, 1, 1, &rmidi);
 	if (err < 0)
 		goto err_allocated;
 	rmidi->private_data = scs;
 	rmidi->private_free = remove_scs1x;

 	snprintf(rmidi->name, sizeof(rmidi->name),
 		 "%s MIDI", oxfw->card->shortname);

 	rmidi->info_flags = SNDRV_RAWMIDI_INFO_INPUT |
 			    SNDRV_RAWMIDI_INFO_OUTPUT |
 			    SNDRV_RAWMIDI_INFO_DUPLEX;
 	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
 			    &midi_capture_ops);
 	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
 			    &midi_playback_ops);

 	INIT_WORK(&scs->work, scs_output_work);
 	init_waitqueue_head(&scs->idle_wait);
 	scs->output_idle = true;

 	return 0;
 err_allocated:
 	fw_core_remove_address_handler(&scs->hss_handler);
 	return err;
 }
	/*
	* oxfw-scs1x.c - a part of driver for OXFW970/971 based devices
	*
	* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
	* Copyright (c) 2015 Takashi Sakamoto <o-takashi@sakamocchi.jp>
	*
	* Licensed under the terms of the GNU General Public License, version 2.
	*/

	#include "oxfw.h"

	#define HSS1394_ADDRESS 0xc007dedadadaULL
	#define HSS1394_MAX_PACKET_SIZE 64
	#define HSS1394_TAG_USER_DATA 0x00
	#define HSS1394_TAG_CHANGE_ADDRESS 0xf1

	struct fw_scs1x {
	struct fw_address_handler hss_handler;
	u8 input_escape_count;
	struct snd_rawmidi_substream *input;

	/* For MIDI playback. */
	struct snd_rawmidi_substream *output;
	bool output_idle;
	u8 output_status;
	u8 output_bytes;
	bool output_escaped;
	bool output_escape_high_nibble;
	struct work_struct work;
	wait_queue_head_t idle_wait;
	u8 buffer[HSS1394_MAX_PACKET_SIZE];
	bool transaction_running;
	struct fw_transaction transaction;
	unsigned int transaction_bytes;
	bool error;
	struct fw_device *fw_dev;
	};

	static const u8 sysex_escape_prefix[] = {
	0xf0, /* SysEx begin */
	0x00, 0x01, 0x60, /* Stanton DJ */
	0x48, 0x53, 0x53, /* "HSS" */
	};

	static void midi_input_escaped_byte(struct snd_rawmidi_substream *stream,
	u8 byte)
	{
	u8 nibbles[2];

	nibbles[0] = byte >> 4;
	nibbles[1] = byte & 0x0f;
	snd_rawmidi_receive(stream, nibbles, 2);
	}

	static void midi_input_byte(struct fw_scs1x *scs,
	struct snd_rawmidi_substream *stream, u8 byte)
	{
	const u8 eox = 0xf7;

	if (scs->input_escape_count > 0) {
	midi_input_escaped_byte(stream, byte);
	scs->input_escape_count--;
	if (scs->input_escape_count == 0)
	snd_rawmidi_receive(stream, &eox, sizeof(eox));
	} else if (byte == 0xf9) {
	snd_rawmidi_receive(stream, sysex_escape_prefix,
	ARRAY_SIZE(sysex_escape_prefix));
	midi_input_escaped_byte(stream, 0x00);
	midi_input_escaped_byte(stream, 0xf9);
	scs->input_escape_count = 3;
	} else {
	snd_rawmidi_receive(stream, &byte, 1);
	}
	}

	static void midi_input_packet(struct fw_scs1x *scs,
	struct snd_rawmidi_substream *stream,
	const u8 *data, unsigned int bytes)
	{
	unsigned int i;
	const u8 eox = 0xf7;

	if (data[0] == HSS1394_TAG_USER_DATA) {
	for (i = 1; i < bytes; ++i)
	midi_input_byte(scs, stream, data[i]);
	} else {
	snd_rawmidi_receive(stream, sysex_escape_prefix,
	ARRAY_SIZE(sysex_escape_prefix));
	for (i = 0; i < bytes; ++i)
	midi_input_escaped_byte(stream, data[i]);
	snd_rawmidi_receive(stream, &eox, sizeof(eox));
	}
	}

	static void handle_hss(struct fw_card card, struct fw_request request,
	int tcode, int destination, int source, int generation,
	unsigned long long offset, void *data, size_t length,
	void *callback_data)
	{
	struct fw_scs1x *scs = callback_data;
	struct snd_rawmidi_substream *stream;
	int rcode;

	if (offset != scs->hss_handler.offset) {
	rcode = RCODE_ADDRESS_ERROR;
	goto end;
	}
	if (tcode != TCODE_WRITE_QUADLET_REQUEST &&
	tcode != TCODE_WRITE_BLOCK_REQUEST) {
	rcode = RCODE_TYPE_ERROR;
	goto end;
	}

	if (length >= 1) {
	stream = ACCESS_ONCE(scs->input);
	if (stream)
	midi_input_packet(scs, stream, data, length);
	}

	rcode = RCODE_COMPLETE;
	end:
	fw_send_response(card, request, rcode);
	}

	static void scs_write_callback(struct fw_card *card, int rcode,
	void data, size_t length, void callback_data)
	{
	struct fw_scs1x *scs = callback_data;

	if (!rcode_is_permanent_error(rcode)) {
	/* Don't retry for this data. */
	if (rcode == RCODE_COMPLETE)
	scs->transaction_bytes = 0;
	} else {
	scs->error = true;
	}

	scs->transaction_running = false;
	schedule_work(&scs->work);
	}

	static bool is_valid_running_status(u8 status)
	{
	return status >= 0x80 && status <= 0xef;
	}

	static bool is_one_byte_cmd(u8 status)
	{
	return status == 0xf6 \|\|
	status >= 0xf8;
	}

	static bool is_two_bytes_cmd(u8 status)
	{
	return (status >= 0xc0 && status <= 0xdf) \|\|
	status == 0xf1 \|\|
	status == 0xf3;
	}

	static bool is_three_bytes_cmd(u8 status)
	{
	return (status >= 0x80 && status <= 0xbf) \|\|
	(status >= 0xe0 && status <= 0xef) \|\|
	status == 0xf2;
	}

	static bool is_invalid_cmd(u8 status)
	{
	return status == 0xf4 \|\|
	status == 0xf5 \|\|
	status == 0xf9 \|\|
	status == 0xfd;
	}

	static void scs_output_work(struct work_struct *work)
	{
	struct fw_scs1x *scs = container_of(work, struct fw_scs1x, work);
	struct snd_rawmidi_substream *stream;
	unsigned int i;
	u8 byte;
	int generation;

	if (scs->transaction_running)
	return;

	stream = ACCESS_ONCE(scs->output);
	if (!stream \|\| scs->error) {
	scs->output_idle = true;
	wake_up(&scs->idle_wait);
	return;
	}

	if (scs->transaction_bytes > 0)
	goto retry;

	i = scs->output_bytes;
	for (;;) {
	if (snd_rawmidi_transmit(stream, &byte, 1) != 1) {
	scs->output_bytes = i;
	scs->output_idle = true;
	wake_up(&scs->idle_wait);
	return;
	}
	/*
	* Convert from real MIDI to what I think the device expects (no
	* running status, one command per packet, unescaped SysExs).
	*/
	if (scs->output_escaped && byte < 0x80) {
	if (scs->output_escape_high_nibble) {
	if (i < HSS1394_MAX_PACKET_SIZE) {
	scs->buffer[i] = byte << 4;
	scs->output_escape_high_nibble = false;
	}
	} else {
	scs->buffer[i++] \|= byte & 0x0f;
	scs->output_escape_high_nibble = true;
	}
	} else if (byte < 0x80) {
	if (i == 1) {
	if (!is_valid_running_status(
	scs->output_status))
	continue;
	scs->buffer[0] = HSS1394_TAG_USER_DATA;
	scs->buffer[i++] = scs->output_status;
	}
	scs->buffer[i++] = byte;
	if ((i == 3 && is_two_bytes_cmd(scs->output_status)) \|\|
	(i == 4 && is_three_bytes_cmd(scs->output_status)))
	break;
	if (i == 1 + ARRAY_SIZE(sysex_escape_prefix) &&
	!memcmp(scs->buffer + 1, sysex_escape_prefix,
	ARRAY_SIZE(sysex_escape_prefix))) {
	scs->output_escaped = true;
	scs->output_escape_high_nibble = true;
	i = 0;
	}
	if (i >= HSS1394_MAX_PACKET_SIZE)
	i = 1;
	} else if (byte == 0xf7) {
	if (scs->output_escaped) {
	if (i >= 1 && scs->output_escape_high_nibble &&
	scs->buffer[0] !=
	HSS1394_TAG_CHANGE_ADDRESS)
	break;
	} else {
	if (i > 1 && scs->output_status == 0xf0) {
	scs->buffer[i++] = 0xf7;
	break;
	}
	}
	i = 1;
	scs->output_escaped = false;
	} else if (!is_invalid_cmd(byte) && byte < 0xf8) {
	i = 1;
	scs->buffer[0] = HSS1394_TAG_USER_DATA;
	scs->buffer[i++] = byte;
	scs->output_status = byte;
	scs->output_escaped = false;
	if (is_one_byte_cmd(byte))
	break;
	}
	}
	scs->output_bytes = 1;
	scs->output_escaped = false;

	scs->transaction_bytes = i;
	retry:
	scs->transaction_running = true;
	generation = scs->fw_dev->generation;
	smp_rmb(); /* node_id vs. generation */
	fw_send_request(scs->fw_dev->card, &scs->transaction,
	TCODE_WRITE_BLOCK_REQUEST, scs->fw_dev->node_id,
	generation, scs->fw_dev->max_speed, HSS1394_ADDRESS,
	scs->buffer, scs->transaction_bytes,
	scs_write_callback, scs);
	}

	static int midi_capture_open(struct snd_rawmidi_substream *stream)
	{
	return 0;
	}

	static int midi_capture_close(struct snd_rawmidi_substream *stream)
	{
	return 0;
	}

	static void midi_capture_trigger(struct snd_rawmidi_substream *stream, int up)
	{
	struct fw_scs1x *scs = stream->rmidi->private_data;

	if (up) {
	scs->input_escape_count = 0;
	ACCESS_ONCE(scs->input) = stream;
	} else {
	ACCESS_ONCE(scs->input) = NULL;
	}
	}

	static const struct snd_rawmidi_ops midi_capture_ops = {
	.open = midi_capture_open,
	.close = midi_capture_close,
	.trigger = midi_capture_trigger,
	};

	static int midi_playback_open(struct snd_rawmidi_substream *stream)
	{
	return 0;
	}

	static int midi_playback_close(struct snd_rawmidi_substream *stream)
	{
	return 0;
	}

	static void midi_playback_trigger(struct snd_rawmidi_substream *stream, int up)
	{
	struct fw_scs1x *scs = stream->rmidi->private_data;

	if (up) {
	scs->output_status = 0;
	scs->output_bytes = 1;
	scs->output_escaped = false;
	scs->output_idle = false;
	scs->transaction_bytes = 0;
	scs->error = false;

	ACCESS_ONCE(scs->output) = stream;
	schedule_work(&scs->work);
	} else {
	ACCESS_ONCE(scs->output) = NULL;
	}
	}
	static void midi_playback_drain(struct snd_rawmidi_substream *stream)
	{
	struct fw_scs1x *scs = stream->rmidi->private_data;

	wait_event(scs->idle_wait, scs->output_idle);
	}

	static int register_address(struct snd_oxfw *oxfw)
	{
	struct fw_scs1x *scs = oxfw->spec;
	__be64 data;

	data = cpu_to_be64(((u64)HSS1394_TAG_CHANGE_ADDRESS << 56) \|
	scs->hss_handler.offset);
	return snd_fw_transaction(oxfw->unit, TCODE_WRITE_BLOCK_REQUEST,
	HSS1394_ADDRESS, &data, sizeof(data), 0);
	}

	static void remove_scs1x(struct snd_rawmidi *rmidi)
	{
	struct fw_scs1x *scs = rmidi->private_data;

	fw_core_remove_address_handler(&scs->hss_handler);
	}

	void snd_oxfw_scs1x_update(struct snd_oxfw *oxfw)
	{
	register_address(oxfw);
	}

	int snd_oxfw_scs1x_add(struct snd_oxfw *oxfw)
	{
	static const struct snd_rawmidi_ops midi_playback_ops = {
	.open = midi_playback_open,
	.close = midi_playback_close,
	.trigger = midi_playback_trigger,
	.drain = midi_playback_drain,
	};
	struct snd_rawmidi *rmidi;
	struct fw_scs1x *scs;
	int err;

	scs = kzalloc(sizeof(struct fw_scs1x), GFP_KERNEL);
	if (scs == NULL)
	return -ENOMEM;
	scs->fw_dev = fw_parent_device(oxfw->unit);
	oxfw->spec = scs;

	/* Allocate own handler for imcoming asynchronous transaction. */
	scs->hss_handler.length = HSS1394_MAX_PACKET_SIZE;
	scs->hss_handler.address_callback = handle_hss;
	scs->hss_handler.callback_data = scs;
	err = fw_core_add_address_handler(&scs->hss_handler,
	&fw_high_memory_region);
	if (err < 0)
	return err;

	err = register_address(oxfw);
	if (err < 0)
	goto err_allocated;

	/* Use unique name for backward compatibility to scs1x module. */
	err = snd_rawmidi_new(oxfw->card, "SCS.1x", 0, 1, 1, &rmidi);
	if (err < 0)
	goto err_allocated;
	rmidi->private_data = scs;
	rmidi->private_free = remove_scs1x;

	snprintf(rmidi->name, sizeof(rmidi->name),
	"%s MIDI", oxfw->card->shortname);

	rmidi->info_flags = SNDRV_RAWMIDI_INFO_INPUT \|
	SNDRV_RAWMIDI_INFO_OUTPUT \|
	SNDRV_RAWMIDI_INFO_DUPLEX;
	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT,
	&midi_capture_ops);
	snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT,
	&midi_playback_ops);

	INIT_WORK(&scs->work, scs_output_work);
	init_waitqueue_head(&scs->idle_wait);
	scs->output_idle = true;

	return 0;
	err_allocated:
	fw_core_remove_address_handler(&scs->hss_handler);
	return err;
	}