sound/synth/emux/emux_seq.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  *  Midi Sequencer interface routines.
  *
  *  Copyright (C) 1999 Steve Ratcliffe
  *  Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
  */

 #include "emux_voice.h"
 #include <linux/slab.h>
 #include <linux/module.h>

 /* Prototypes for static functions */
 static void free_port(void *private);
 static void snd_emux_init_port(struct snd_emux_port *p);
 static int snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info);
 static int snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info);

 /*
  * MIDI emulation operators
  */
 static const struct snd_midi_op emux_ops = {
 	.note_on = snd_emux_note_on,
 	.note_off = snd_emux_note_off,
 	.key_press = snd_emux_key_press,
 	.note_terminate = snd_emux_terminate_note,
 	.control = snd_emux_control,
 	.nrpn = snd_emux_nrpn,
 	.sysex = snd_emux_sysex,
 };


 /*
  * number of MIDI channels
  */
 #define MIDI_CHANNELS		16

 /*
  * type flags for MIDI sequencer port
  */
 #define DEFAULT_MIDI_TYPE	(SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC |\
 				 SNDRV_SEQ_PORT_TYPE_MIDI_GM |\
 				 SNDRV_SEQ_PORT_TYPE_MIDI_GS |\
 				 SNDRV_SEQ_PORT_TYPE_MIDI_XG |\
 				 SNDRV_SEQ_PORT_TYPE_HARDWARE |\
 				 SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)

 /*
  * Initialise the EMUX Synth by creating a client and registering
  * a series of ports.
  * Each of the ports will contain the 16 midi channels.  Applications
  * can connect to these ports to play midi data.
  */
 int
 snd_emux_init_seq(struct snd_emux *emu, struct snd_card *card, int index)
 {
 	int  i;
 	struct snd_seq_port_callback pinfo;
 	char tmpname[64];

 	emu->client = snd_seq_create_kernel_client(card, index,
 						   "%s WaveTable", emu->name);
 	if (emu->client < 0) {
 		dev_err(card->dev, "can't create client\n");
 		return -ENODEV;
 	}

 	if (emu->num_ports <= 0) {
 		dev_warn(card->dev, "seqports must be greater than zero\n");
 		emu->num_ports = 1;
 	} else if (emu->num_ports > SNDRV_EMUX_MAX_PORTS) {
 		dev_warn(card->dev,
 			 "too many ports. limited max. ports %d\n",
 			 SNDRV_EMUX_MAX_PORTS);
 		emu->num_ports = SNDRV_EMUX_MAX_PORTS;
 	}

 	memset(&pinfo, 0, sizeof(pinfo));
 	pinfo.owner = THIS_MODULE;
 	pinfo.use = snd_emux_use;
 	pinfo.unuse = snd_emux_unuse;
 	pinfo.event_input = snd_emux_event_input;

 	for (i = 0; i < emu->num_ports; i++) {
 		struct snd_emux_port *p;

 		sprintf(tmpname, "%s Port %d", emu->name, i);
 		p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS,
 					 0, &pinfo);
 		if (!p) {
 			dev_err(card->dev, "can't create port\n");
 			return -ENOMEM;
 		}

 		p->port_mode =  SNDRV_EMUX_PORT_MODE_MIDI;
 		snd_emux_init_port(p);
 		emu->ports[i] = p->chset.port;
 		emu->portptrs[i] = p;
 	}

 	return 0;
 }


 /*
  * Detach from the ports that were set up for this synthesizer and
  * destroy the kernel client.
  */
 void
 snd_emux_detach_seq(struct snd_emux *emu)
 {
 	if (emu->voices)
 		snd_emux_terminate_all(emu);

 	if (emu->client >= 0) {
 		snd_seq_delete_kernel_client(emu->client);
 		emu->client = -1;
 	}
 }


 /*
  * create a sequencer port and channel_set
  */

 struct snd_emux_port *
 snd_emux_create_port(struct snd_emux *emu, char *name,
 		     int max_channels, int oss_port,
 		     struct snd_seq_port_callback *callback)
 {
 	struct snd_emux_port *p;
 	int i, type, cap;

 	/* Allocate structures for this channel */
 	p = kzalloc(sizeof(*p), GFP_KERNEL);
 	if (!p)
 		return NULL;

 	p->chset.channels = kcalloc(max_channels, sizeof(*p->chset.channels),
 				    GFP_KERNEL);
 	if (!p->chset.channels) {
 		kfree(p);
 		return NULL;
 	}
 	for (i = 0; i < max_channels; i++)
 		p->chset.channels[i].number = i;
 	p->chset.private_data = p;
 	p->chset.max_channels = max_channels;
 	p->emu = emu;
 	p->chset.client = emu->client;
 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
 	snd_emux_create_effect(p);
 #endif
 	callback->private_free = free_port;
 	callback->private_data = p;

 	cap = SNDRV_SEQ_PORT_CAP_WRITE;
 	if (oss_port) {
 		type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
 	} else {
 		type = DEFAULT_MIDI_TYPE;
 		cap |= SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
 	}

 	p->chset.port = snd_seq_event_port_attach(emu->client, callback,
 						  cap, type, max_channels,
 						  emu->max_voices, name);

 	return p;
 }


 /*
  * release memory block for port
  */
 static void
 free_port(void *private_data)
 {
 	struct snd_emux_port *p;

 	p = private_data;
 	if (p) {
 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
 		snd_emux_delete_effect(p);
 #endif
 		kfree(p->chset.channels);
 		kfree(p);
 	}
 }


 #define DEFAULT_DRUM_FLAGS	(1<<9)

 /*
  * initialize the port specific parameters
  */
 static void
 snd_emux_init_port(struct snd_emux_port *p)
 {
 	p->drum_flags = DEFAULT_DRUM_FLAGS;
 	p->volume_atten = 0;

 	snd_emux_reset_port(p);
 }


 /*
  * reset port
  */
 void
 snd_emux_reset_port(struct snd_emux_port *port)
 {
 	int i;

 	/* stop all sounds */
 	snd_emux_sounds_off_all(port);

 	snd_midi_channel_set_clear(&port->chset);

 #ifdef SNDRV_EMUX_USE_RAW_EFFECT
 	snd_emux_clear_effect(port);
 #endif

 	/* set port specific control parameters */
 	port->ctrls[EMUX_MD_DEF_BANK] = 0;
 	port->ctrls[EMUX_MD_DEF_DRUM] = 0;
 	port->ctrls[EMUX_MD_REALTIME_PAN] = 1;

 	for (i = 0; i < port->chset.max_channels; i++) {
 		struct snd_midi_channel *chan = port->chset.channels + i;
 		chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
 	}
 }


 /*
  * input sequencer event
  */
 int
 snd_emux_event_input(struct snd_seq_event *ev, int direct, void *private_data,
 		     int atomic, int hop)
 {
 	struct snd_emux_port *port;

 	port = private_data;
 	if (snd_BUG_ON(!port || !ev))
 		return -EINVAL;

 	snd_midi_process_event(&emux_ops, ev, &port->chset);

 	return 0;
 }


 /*
  * increment usage count
  */
 static int
 __snd_emux_inc_count(struct snd_emux *emu)
 {
 	emu->used++;
 	if (!try_module_get(emu->ops.owner))
 		goto __error;
 	if (!try_module_get(emu->card->module)) {
 		module_put(emu->ops.owner);
 	      __error:
 		emu->used--;
 		return 0;
 	}
 	return 1;
 }

 int snd_emux_inc_count(struct snd_emux *emu)
 {
 	int ret;

 	mutex_lock(&emu->register_mutex);
 	ret = __snd_emux_inc_count(emu);
 	mutex_unlock(&emu->register_mutex);
 	return ret;
 }

 /*
  * decrease usage count
  */
 static void
 __snd_emux_dec_count(struct snd_emux *emu)
 {
 	module_put(emu->card->module);
 	emu->used--;
 	if (emu->used <= 0)
 		snd_emux_terminate_all(emu);
 	module_put(emu->ops.owner);
 }

 void snd_emux_dec_count(struct snd_emux *emu)
 {
 	mutex_lock(&emu->register_mutex);
 	__snd_emux_dec_count(emu);
 	mutex_unlock(&emu->register_mutex);
 }

 /*
  * Routine that is called upon a first use of a particular port
  */
 static int
 snd_emux_use(void *private_data, struct snd_seq_port_subscribe *info)
 {
 	struct snd_emux_port *p;
 	struct snd_emux *emu;

 	p = private_data;
 	if (snd_BUG_ON(!p))
 		return -EINVAL;
 	emu = p->emu;
 	if (snd_BUG_ON(!emu))
 		return -EINVAL;

 	mutex_lock(&emu->register_mutex);
 	snd_emux_init_port(p);
 	__snd_emux_inc_count(emu);
 	mutex_unlock(&emu->register_mutex);
 	return 0;
 }

 /*
  * Routine that is called upon the last unuse() of a particular port.
  */
 static int
 snd_emux_unuse(void *private_data, struct snd_seq_port_subscribe *info)
 {
 	struct snd_emux_port *p;
 	struct snd_emux *emu;

 	p = private_data;
 	if (snd_BUG_ON(!p))
 		return -EINVAL;
 	emu = p->emu;
 	if (snd_BUG_ON(!emu))
 		return -EINVAL;

 	mutex_lock(&emu->register_mutex);
 	snd_emux_sounds_off_all(p);
 	__snd_emux_dec_count(emu);
 	mutex_unlock(&emu->register_mutex);
 	return 0;
 }


 /*
  * attach virtual rawmidi devices
  */
 int snd_emux_init_virmidi(struct snd_emux *emu, struct snd_card *card)
 {
 	int i;

 	emu->vmidi = NULL;
 	if (emu->midi_ports <= 0)
 		return 0;

 	emu->vmidi = kcalloc(emu->midi_ports, sizeof(*emu->vmidi), GFP_KERNEL);
 	if (!emu->vmidi)
 		return -ENOMEM;

 	for (i = 0; i < emu->midi_ports; i++) {
 		struct snd_rawmidi *rmidi;
 		struct snd_virmidi_dev *rdev;
 		if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
 			goto __error;
 		rdev = rmidi->private_data;
 		sprintf(rmidi->name, "%s Synth MIDI", emu->name);
 		rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
 		rdev->client = emu->client;
 		rdev->port = emu->ports[i];
 		if (snd_device_register(card, rmidi) < 0) {
 			snd_device_free(card, rmidi);
 			goto __error;
 		}
 		emu->vmidi[i] = rmidi;
 	}
 	return 0;

 __error:
 	snd_emux_delete_virmidi(emu);
 	return -ENOMEM;
 }

 int snd_emux_delete_virmidi(struct snd_emux *emu)
 {
 	int i;

 	if (!emu->vmidi)
 		return 0;

 	for (i = 0; i < emu->midi_ports; i++) {
 		if (emu->vmidi[i])
 			snd_device_free(emu->card, emu->vmidi[i]);
 	}
 	kfree(emu->vmidi);
 	emu->vmidi = NULL;
 	return 0;
 }
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* Midi Sequencer interface routines.
	*
	* Copyright (C) 1999 Steve Ratcliffe
	* Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
	*/

	#include "emux_voice.h"
	#include <linux/slab.h>
	#include <linux/module.h>

	/* Prototypes for static functions */
	static void free_port(void *private);
	static void snd_emux_init_port(struct snd_emux_port *p);
	static int snd_emux_use(void private_data, struct snd_seq_port_subscribe info);
	static int snd_emux_unuse(void private_data, struct snd_seq_port_subscribe info);

	/*
	* MIDI emulation operators
	*/
	static const struct snd_midi_op emux_ops = {
	.note_on = snd_emux_note_on,
	.note_off = snd_emux_note_off,
	.key_press = snd_emux_key_press,
	.note_terminate = snd_emux_terminate_note,
	.control = snd_emux_control,
	.nrpn = snd_emux_nrpn,
	.sysex = snd_emux_sysex,
	};


	/*
	* number of MIDI channels
	*/
	#define MIDI_CHANNELS 16

	/*
	* type flags for MIDI sequencer port
	*/
	#define DEFAULT_MIDI_TYPE (SNDRV_SEQ_PORT_TYPE_MIDI_GENERIC \|\
	SNDRV_SEQ_PORT_TYPE_MIDI_GM \|\
	SNDRV_SEQ_PORT_TYPE_MIDI_GS \|\
	SNDRV_SEQ_PORT_TYPE_MIDI_XG \|\
	SNDRV_SEQ_PORT_TYPE_HARDWARE \|\
	SNDRV_SEQ_PORT_TYPE_SYNTHESIZER)

	/*
	* Initialise the EMUX Synth by creating a client and registering
	* a series of ports.
	* Each of the ports will contain the 16 midi channels. Applications
	* can connect to these ports to play midi data.
	*/
	int
	snd_emux_init_seq(struct snd_emux emu, struct snd_card card, int index)
	{
	int i;
	struct snd_seq_port_callback pinfo;
	char tmpname[64];

	emu->client = snd_seq_create_kernel_client(card, index,
	"%s WaveTable", emu->name);
	if (emu->client < 0) {
	dev_err(card->dev, "can't create client\n");
	return -ENODEV;
	}

	if (emu->num_ports <= 0) {
	dev_warn(card->dev, "seqports must be greater than zero\n");
	emu->num_ports = 1;
	} else if (emu->num_ports > SNDRV_EMUX_MAX_PORTS) {
	dev_warn(card->dev,
	"too many ports. limited max. ports %d\n",
	SNDRV_EMUX_MAX_PORTS);
	emu->num_ports = SNDRV_EMUX_MAX_PORTS;
	}

	memset(&pinfo, 0, sizeof(pinfo));
	pinfo.owner = THIS_MODULE;
	pinfo.use = snd_emux_use;
	pinfo.unuse = snd_emux_unuse;
	pinfo.event_input = snd_emux_event_input;

	for (i = 0; i < emu->num_ports; i++) {
	struct snd_emux_port *p;

	sprintf(tmpname, "%s Port %d", emu->name, i);
	p = snd_emux_create_port(emu, tmpname, MIDI_CHANNELS,
	0, &pinfo);
	if (!p) {
	dev_err(card->dev, "can't create port\n");
	return -ENOMEM;
	}

	p->port_mode = SNDRV_EMUX_PORT_MODE_MIDI;
	snd_emux_init_port(p);
	emu->ports[i] = p->chset.port;
	emu->portptrs[i] = p;
	}

	return 0;
	}


	/*
	* Detach from the ports that were set up for this synthesizer and
	* destroy the kernel client.
	*/
	void
	snd_emux_detach_seq(struct snd_emux *emu)
	{
	if (emu->voices)
	snd_emux_terminate_all(emu);

	if (emu->client >= 0) {
	snd_seq_delete_kernel_client(emu->client);
	emu->client = -1;
	}
	}


	/*
	* create a sequencer port and channel_set
	*/

	struct snd_emux_port *
	snd_emux_create_port(struct snd_emux emu, char name,
	int max_channels, int oss_port,
	struct snd_seq_port_callback *callback)
	{
	struct snd_emux_port *p;
	int i, type, cap;

	/* Allocate structures for this channel */
	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
	return NULL;

	p->chset.channels = kcalloc(max_channels, sizeof(*p->chset.channels),
	GFP_KERNEL);
	if (!p->chset.channels) {
	kfree(p);
	return NULL;
	}
	for (i = 0; i < max_channels; i++)
	p->chset.channels[i].number = i;
	p->chset.private_data = p;
	p->chset.max_channels = max_channels;
	p->emu = emu;
	p->chset.client = emu->client;
	#ifdef SNDRV_EMUX_USE_RAW_EFFECT
	snd_emux_create_effect(p);
	#endif
	callback->private_free = free_port;
	callback->private_data = p;

	cap = SNDRV_SEQ_PORT_CAP_WRITE;
	if (oss_port) {
	type = SNDRV_SEQ_PORT_TYPE_SPECIFIC;
	} else {
	type = DEFAULT_MIDI_TYPE;
	cap \|= SNDRV_SEQ_PORT_CAP_SUBS_WRITE;
	}

	p->chset.port = snd_seq_event_port_attach(emu->client, callback,
	cap, type, max_channels,
	emu->max_voices, name);

	return p;
	}


	/*
	* release memory block for port
	*/
	static void
	free_port(void *private_data)
	{
	struct snd_emux_port *p;

	p = private_data;
	if (p) {
	#ifdef SNDRV_EMUX_USE_RAW_EFFECT
	snd_emux_delete_effect(p);
	#endif
	kfree(p->chset.channels);
	kfree(p);
	}
	}


	#define DEFAULT_DRUM_FLAGS (1<<9)

	/*
	* initialize the port specific parameters
	*/
	static void
	snd_emux_init_port(struct snd_emux_port *p)
	{
	p->drum_flags = DEFAULT_DRUM_FLAGS;
	p->volume_atten = 0;

	snd_emux_reset_port(p);
	}


	/*
	* reset port
	*/
	void
	snd_emux_reset_port(struct snd_emux_port *port)
	{
	int i;

	/* stop all sounds */
	snd_emux_sounds_off_all(port);

	snd_midi_channel_set_clear(&port->chset);

	#ifdef SNDRV_EMUX_USE_RAW_EFFECT
	snd_emux_clear_effect(port);
	#endif

	/* set port specific control parameters */
	port->ctrls[EMUX_MD_DEF_BANK] = 0;
	port->ctrls[EMUX_MD_DEF_DRUM] = 0;
	port->ctrls[EMUX_MD_REALTIME_PAN] = 1;

	for (i = 0; i < port->chset.max_channels; i++) {
	struct snd_midi_channel *chan = port->chset.channels + i;
	chan->drum_channel = ((port->drum_flags >> i) & 1) ? 1 : 0;
	}
	}


	/*
	* input sequencer event
	*/
	int
	snd_emux_event_input(struct snd_seq_event ev, int direct, void private_data,
	int atomic, int hop)
	{
	struct snd_emux_port *port;

	port = private_data;
	if (snd_BUG_ON(!port \|\| !ev))
	return -EINVAL;

	snd_midi_process_event(&emux_ops, ev, &port->chset);

	return 0;
	}


	/*
	* increment usage count
	*/
	static int
	__snd_emux_inc_count(struct snd_emux *emu)
	{
	emu->used++;
	if (!try_module_get(emu->ops.owner))
	goto __error;
	if (!try_module_get(emu->card->module)) {
	module_put(emu->ops.owner);
	__error:
	emu->used--;
	return 0;
	}
	return 1;
	}

	int snd_emux_inc_count(struct snd_emux *emu)
	{
	int ret;

	mutex_lock(&emu->register_mutex);
	ret = __snd_emux_inc_count(emu);
	mutex_unlock(&emu->register_mutex);
	return ret;
	}

	/*
	* decrease usage count
	*/
	static void
	__snd_emux_dec_count(struct snd_emux *emu)
	{
	module_put(emu->card->module);
	emu->used--;
	if (emu->used <= 0)
	snd_emux_terminate_all(emu);
	module_put(emu->ops.owner);
	}

	void snd_emux_dec_count(struct snd_emux *emu)
	{
	mutex_lock(&emu->register_mutex);
	__snd_emux_dec_count(emu);
	mutex_unlock(&emu->register_mutex);
	}

	/*
	* Routine that is called upon a first use of a particular port
	*/
	static int
	snd_emux_use(void private_data, struct snd_seq_port_subscribe info)
	{
	struct snd_emux_port *p;
	struct snd_emux *emu;

	p = private_data;
	if (snd_BUG_ON(!p))
	return -EINVAL;
	emu = p->emu;
	if (snd_BUG_ON(!emu))
	return -EINVAL;

	mutex_lock(&emu->register_mutex);
	snd_emux_init_port(p);
	__snd_emux_inc_count(emu);
	mutex_unlock(&emu->register_mutex);
	return 0;
	}

	/*
	* Routine that is called upon the last unuse() of a particular port.
	*/
	static int
	snd_emux_unuse(void private_data, struct snd_seq_port_subscribe info)
	{
	struct snd_emux_port *p;
	struct snd_emux *emu;

	p = private_data;
	if (snd_BUG_ON(!p))
	return -EINVAL;
	emu = p->emu;
	if (snd_BUG_ON(!emu))
	return -EINVAL;

	mutex_lock(&emu->register_mutex);
	snd_emux_sounds_off_all(p);
	__snd_emux_dec_count(emu);
	mutex_unlock(&emu->register_mutex);
	return 0;
	}


	/*
	* attach virtual rawmidi devices
	*/
	int snd_emux_init_virmidi(struct snd_emux emu, struct snd_card card)
	{
	int i;

	emu->vmidi = NULL;
	if (emu->midi_ports <= 0)
	return 0;

	emu->vmidi = kcalloc(emu->midi_ports, sizeof(*emu->vmidi), GFP_KERNEL);
	if (!emu->vmidi)
	return -ENOMEM;

	for (i = 0; i < emu->midi_ports; i++) {
	struct snd_rawmidi *rmidi;
	struct snd_virmidi_dev *rdev;
	if (snd_virmidi_new(card, emu->midi_devidx + i, &rmidi) < 0)
	goto __error;
	rdev = rmidi->private_data;
	sprintf(rmidi->name, "%s Synth MIDI", emu->name);
	rdev->seq_mode = SNDRV_VIRMIDI_SEQ_ATTACH;
	rdev->client = emu->client;
	rdev->port = emu->ports[i];
	if (snd_device_register(card, rmidi) < 0) {
	snd_device_free(card, rmidi);
	goto __error;
	}
	emu->vmidi[i] = rmidi;
	}
	return 0;

	__error:
	snd_emux_delete_virmidi(emu);
	return -ENOMEM;
	}

	int snd_emux_delete_virmidi(struct snd_emux *emu)
	{
	int i;

	if (!emu->vmidi)
	return 0;

	for (i = 0; i < emu->midi_ports; i++) {
	if (emu->vmidi[i])
	snd_device_free(emu->card, emu->vmidi[i]);
	}
	kfree(emu->vmidi);
	emu->vmidi = NULL;
	return 0;
	}