sound/core/seq/oss/seq_oss_synth.c - linux - Git at Google

 /*
  * OSS compatible sequencer driver
  *
  * synth device handlers
  *
  * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  */

 #include "seq_oss_synth.h"
 #include "seq_oss_midi.h"
 #include "../seq_lock.h"
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/slab.h>

 /*
  * constants
  */
 #define SNDRV_SEQ_OSS_MAX_SYNTH_NAME	30
 #define MAX_SYSEX_BUFLEN		128


 /*
  * definition of synth info records
  */

 /* sysex buffer */
 struct seq_oss_synth_sysex {
 	int len;
 	int skip;
 	unsigned char buf[MAX_SYSEX_BUFLEN];
 };

 /* synth info */
 struct seq_oss_synth {
 	int seq_device;

 	/* for synth_info */
 	int synth_type;
 	int synth_subtype;
 	int nr_voices;

 	char name[SNDRV_SEQ_OSS_MAX_SYNTH_NAME];
 	struct snd_seq_oss_callback oper;

 	int opened;

 	void *private_data;
 	snd_use_lock_t use_lock;
 };


 /*
  * device table
  */
 static int max_synth_devs;
 static struct seq_oss_synth *synth_devs[SNDRV_SEQ_OSS_MAX_SYNTH_DEVS];
 static struct seq_oss_synth midi_synth_dev = {
 	.seq_device = -1,
 	.synth_type = SYNTH_TYPE_MIDI,
 	.synth_subtype = 0,
 	.nr_voices = 16,
 	.name = "MIDI",
 };

 static DEFINE_SPINLOCK(register_lock);

 /*
  * prototypes
  */
 static struct seq_oss_synth *get_synthdev(struct seq_oss_devinfo *dp, int dev);
 static void reset_channels(struct seq_oss_synthinfo *info);

 /*
  * global initialization
  */
 void __init
 snd_seq_oss_synth_init(void)
 {
 	snd_use_lock_init(&midi_synth_dev.use_lock);
 }

 /*
  * registration of the synth device
  */
 int
 snd_seq_oss_synth_probe(struct device *_dev)
 {
 	struct snd_seq_device *dev = to_seq_dev(_dev);
 	int i;
 	struct seq_oss_synth *rec;
 	struct snd_seq_oss_reg *reg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
 	unsigned long flags;

 	rec = kzalloc(sizeof(*rec), GFP_KERNEL);
 	if (!rec)
 		return -ENOMEM;
 	rec->seq_device = -1;
 	rec->synth_type = reg->type;
 	rec->synth_subtype = reg->subtype;
 	rec->nr_voices = reg->nvoices;
 	rec->oper = reg->oper;
 	rec->private_data = reg->private_data;
 	rec->opened = 0;
 	snd_use_lock_init(&rec->use_lock);

 	/* copy and truncate the name of synth device */
 	strlcpy(rec->name, dev->name, sizeof(rec->name));

 	/* registration */
 	spin_lock_irqsave(&register_lock, flags);
 	for (i = 0; i < max_synth_devs; i++) {
 		if (synth_devs[i] == NULL)
 			break;
 	}
 	if (i >= max_synth_devs) {
 		if (max_synth_devs >= SNDRV_SEQ_OSS_MAX_SYNTH_DEVS) {
 			spin_unlock_irqrestore(&register_lock, flags);
 			pr_err("ALSA: seq_oss: no more synth slot\n");
 			kfree(rec);
 			return -ENOMEM;
 		}
 		max_synth_devs++;
 	}
 	rec->seq_device = i;
 	synth_devs[i] = rec;
 	spin_unlock_irqrestore(&register_lock, flags);
 	dev->driver_data = rec;
 #ifdef SNDRV_OSS_INFO_DEV_SYNTH
 	if (i < SNDRV_CARDS)
 		snd_oss_info_register(SNDRV_OSS_INFO_DEV_SYNTH, i, rec->name);
 #endif
 	return 0;
 }


 int
 snd_seq_oss_synth_remove(struct device *_dev)
 {
 	struct snd_seq_device *dev = to_seq_dev(_dev);
 	int index;
 	struct seq_oss_synth *rec = dev->driver_data;
 	unsigned long flags;

 	spin_lock_irqsave(&register_lock, flags);
 	for (index = 0; index < max_synth_devs; index++) {
 		if (synth_devs[index] == rec)
 			break;
 	}
 	if (index >= max_synth_devs) {
 		spin_unlock_irqrestore(&register_lock, flags);
 		pr_err("ALSA: seq_oss: can't unregister synth\n");
 		return -EINVAL;
 	}
 	synth_devs[index] = NULL;
 	if (index == max_synth_devs - 1) {
 		for (index--; index >= 0; index--) {
 			if (synth_devs[index])
 				break;
 		}
 		max_synth_devs = index + 1;
 	}
 	spin_unlock_irqrestore(&register_lock, flags);
 #ifdef SNDRV_OSS_INFO_DEV_SYNTH
 	if (rec->seq_device < SNDRV_CARDS)
 		snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_SYNTH, rec->seq_device);
 #endif

 	snd_use_lock_sync(&rec->use_lock);
 	kfree(rec);

 	return 0;
 }


 /*
  */
 static struct seq_oss_synth *
 get_sdev(int dev)
 {
 	struct seq_oss_synth *rec;
 	unsigned long flags;

 	spin_lock_irqsave(&register_lock, flags);
 	rec = synth_devs[dev];
 	if (rec)
 		snd_use_lock_use(&rec->use_lock);
 	spin_unlock_irqrestore(&register_lock, flags);
 	return rec;
 }


 /*
  * set up synth tables
  */

 void
 snd_seq_oss_synth_setup(struct seq_oss_devinfo *dp)
 {
 	int i;
 	struct seq_oss_synth *rec;
 	struct seq_oss_synthinfo *info;

 	dp->max_synthdev = max_synth_devs;
 	dp->synth_opened = 0;
 	memset(dp->synths, 0, sizeof(dp->synths));
 	for (i = 0; i < dp->max_synthdev; i++) {
 		rec = get_sdev(i);
 		if (rec == NULL)
 			continue;
 		if (rec->oper.open == NULL || rec->oper.close == NULL) {
 			snd_use_lock_free(&rec->use_lock);
 			continue;
 		}
 		info = &dp->synths[i];
 		info->arg.app_index = dp->port;
 		info->arg.file_mode = dp->file_mode;
 		info->arg.seq_mode = dp->seq_mode;
 		if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH)
 			info->arg.event_passing = SNDRV_SEQ_OSS_PROCESS_EVENTS;
 		else
 			info->arg.event_passing = SNDRV_SEQ_OSS_PASS_EVENTS;
 		info->opened = 0;
 		if (!try_module_get(rec->oper.owner)) {
 			snd_use_lock_free(&rec->use_lock);
 			continue;
 		}
 		if (rec->oper.open(&info->arg, rec->private_data) < 0) {
 			module_put(rec->oper.owner);
 			snd_use_lock_free(&rec->use_lock);
 			continue;
 		}
 		info->nr_voices = rec->nr_voices;
 		if (info->nr_voices > 0) {
 			info->ch = kcalloc(info->nr_voices, sizeof(struct seq_oss_chinfo), GFP_KERNEL);
 			if (!info->ch) {
 				rec->oper.close(&info->arg);
 				module_put(rec->oper.owner);
 				snd_use_lock_free(&rec->use_lock);
 				continue;
 			}
 			reset_channels(info);
 		}
 		info->opened++;
 		rec->opened++;
 		dp->synth_opened++;
 		snd_use_lock_free(&rec->use_lock);
 	}
 }


 /*
  * set up synth tables for MIDI emulation - /dev/music mode only
  */

 void
 snd_seq_oss_synth_setup_midi(struct seq_oss_devinfo *dp)
 {
 	int i;

 	if (dp->max_synthdev >= SNDRV_SEQ_OSS_MAX_SYNTH_DEVS)
 		return;

 	for (i = 0; i < dp->max_mididev; i++) {
 		struct seq_oss_synthinfo *info;
 		info = &dp->synths[dp->max_synthdev];
 		if (snd_seq_oss_midi_open(dp, i, dp->file_mode) < 0)
 			continue;
 		info->arg.app_index = dp->port;
 		info->arg.file_mode = dp->file_mode;
 		info->arg.seq_mode = dp->seq_mode;
 		info->arg.private_data = info;
 		info->is_midi = 1;
 		info->midi_mapped = i;
 		info->arg.event_passing = SNDRV_SEQ_OSS_PASS_EVENTS;
 		snd_seq_oss_midi_get_addr(dp, i, &info->arg.addr);
 		info->opened = 1;
 		midi_synth_dev.opened++;
 		dp->max_synthdev++;
 		if (dp->max_synthdev >= SNDRV_SEQ_OSS_MAX_SYNTH_DEVS)
 			break;
 	}
 }


 /*
  * clean up synth tables
  */

 void
 snd_seq_oss_synth_cleanup(struct seq_oss_devinfo *dp)
 {
 	int i;
 	struct seq_oss_synth *rec;
 	struct seq_oss_synthinfo *info;

 	if (snd_BUG_ON(dp->max_synthdev > SNDRV_SEQ_OSS_MAX_SYNTH_DEVS))
 		return;
 	for (i = 0; i < dp->max_synthdev; i++) {
 		info = &dp->synths[i];
 		if (! info->opened)
 			continue;
 		if (info->is_midi) {
 			if (midi_synth_dev.opened > 0) {
 				snd_seq_oss_midi_close(dp, info->midi_mapped);
 				midi_synth_dev.opened--;
 			}
 		} else {
 			rec = get_sdev(i);
 			if (rec == NULL)
 				continue;
 			if (rec->opened > 0) {
 				rec->oper.close(&info->arg);
 				module_put(rec->oper.owner);
 				rec->opened = 0;
 			}
 			snd_use_lock_free(&rec->use_lock);
 		}
 		kfree(info->sysex);
 		info->sysex = NULL;
 		kfree(info->ch);
 		info->ch = NULL;
 	}
 	dp->synth_opened = 0;
 	dp->max_synthdev = 0;
 }

 /*
  * check if the specified device is MIDI mapped device
  */
 static int
 is_midi_dev(struct seq_oss_devinfo *dp, int dev)
 {
 	if (dev < 0 || dev >= dp->max_synthdev)
 		return 0;
 	if (dp->synths[dev].is_midi)
 		return 1;
 	return 0;
 }

 /*
  * return synth device information pointer
  */
 static struct seq_oss_synth *
 get_synthdev(struct seq_oss_devinfo *dp, int dev)
 {
 	struct seq_oss_synth *rec;
 	if (dev < 0 || dev >= dp->max_synthdev)
 		return NULL;
 	if (! dp->synths[dev].opened)
 		return NULL;
 	if (dp->synths[dev].is_midi)
 		return &midi_synth_dev;
 	if ((rec = get_sdev(dev)) == NULL)
 		return NULL;
 	if (! rec->opened) {
 		snd_use_lock_free(&rec->use_lock);
 		return NULL;
 	}
 	return rec;
 }


 /*
  * reset note and velocity on each channel.
  */
 static void
 reset_channels(struct seq_oss_synthinfo *info)
 {
 	int i;
 	if (info->ch == NULL || ! info->nr_voices)
 		return;
 	for (i = 0; i < info->nr_voices; i++) {
 		info->ch[i].note = -1;
 		info->ch[i].vel = 0;
 	}
 }


 /*
  * reset synth device:
  * call reset callback.  if no callback is defined, send a heartbeat
  * event to the corresponding port.
  */
 void
 snd_seq_oss_synth_reset(struct seq_oss_devinfo *dp, int dev)
 {
 	struct seq_oss_synth *rec;
 	struct seq_oss_synthinfo *info;

 	if (snd_BUG_ON(dev < 0 || dev >= dp->max_synthdev))
 		return;
 	info = &dp->synths[dev];
 	if (! info->opened)
 		return;
 	if (info->sysex)
 		info->sysex->len = 0; /* reset sysex */
 	reset_channels(info);
 	if (info->is_midi) {
 		if (midi_synth_dev.opened <= 0)
 			return;
 		snd_seq_oss_midi_reset(dp, info->midi_mapped);
 		/* reopen the device */
 		snd_seq_oss_midi_close(dp, dev);
 		if (snd_seq_oss_midi_open(dp, info->midi_mapped,
 					  dp->file_mode) < 0) {
 			midi_synth_dev.opened--;
 			info->opened = 0;
 			kfree(info->sysex);
 			info->sysex = NULL;
 			kfree(info->ch);
 			info->ch = NULL;
 		}
 		return;
 	}

 	rec = get_sdev(dev);
 	if (rec == NULL)
 		return;
 	if (rec->oper.reset) {
 		rec->oper.reset(&info->arg);
 	} else {
 		struct snd_seq_event ev;
 		memset(&ev, 0, sizeof(ev));
 		snd_seq_oss_fill_addr(dp, &ev, info->arg.addr.client,
 				      info->arg.addr.port);
 		ev.type = SNDRV_SEQ_EVENT_RESET;
 		snd_seq_oss_dispatch(dp, &ev, 0, 0);
 	}
 	snd_use_lock_free(&rec->use_lock);
 }


 /*
  * load a patch record:
  * call load_patch callback function
  */
 int
 snd_seq_oss_synth_load_patch(struct seq_oss_devinfo *dp, int dev, int fmt,
 			    const char __user *buf, int p, int c)
 {
 	struct seq_oss_synth *rec;
 	int rc;

 	if (dev < 0 || dev >= dp->max_synthdev)
 		return -ENXIO;

 	if (is_midi_dev(dp, dev))
 		return 0;
 	if ((rec = get_synthdev(dp, dev)) == NULL)
 		return -ENXIO;

 	if (rec->oper.load_patch == NULL)
 		rc = -ENXIO;
 	else
 		rc = rec->oper.load_patch(&dp->synths[dev].arg, fmt, buf, p, c);
 	snd_use_lock_free(&rec->use_lock);
 	return rc;
 }

 /*
  * check if the device is valid synth device
  */
 int
 snd_seq_oss_synth_is_valid(struct seq_oss_devinfo *dp, int dev)
 {
 	struct seq_oss_synth *rec;
 	rec = get_synthdev(dp, dev);
 	if (rec) {
 		snd_use_lock_free(&rec->use_lock);
 		return 1;
 	}
 	return 0;
 }


 /*
  * receive OSS 6 byte sysex packet:
  * the full sysex message will be sent if it reaches to the end of data
  * (0xff).
  */
 int
 snd_seq_oss_synth_sysex(struct seq_oss_devinfo *dp, int dev, unsigned char *buf, struct snd_seq_event *ev)
 {
 	int i, send;
 	unsigned char *dest;
 	struct seq_oss_synth_sysex *sysex;

 	if (! snd_seq_oss_synth_is_valid(dp, dev))
 		return -ENXIO;

 	sysex = dp->synths[dev].sysex;
 	if (sysex == NULL) {
 		sysex = kzalloc(sizeof(*sysex), GFP_KERNEL);
 		if (sysex == NULL)
 			return -ENOMEM;
 		dp->synths[dev].sysex = sysex;
 	}

 	send = 0;
 	dest = sysex->buf + sysex->len;
 	/* copy 6 byte packet to the buffer */
 	for (i = 0; i < 6; i++) {
 		if (buf[i] == 0xff) {
 			send = 1;
 			break;
 		}
 		dest[i] = buf[i];
 		sysex->len++;
 		if (sysex->len >= MAX_SYSEX_BUFLEN) {
 			sysex->len = 0;
 			sysex->skip = 1;
 			break;
 		}
 	}

 	if (sysex->len && send) {
 		if (sysex->skip) {
 			sysex->skip = 0;
 			sysex->len = 0;
 			return -EINVAL; /* skip */
 		}
 		/* copy the data to event record and send it */
 		ev->flags = SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
 		if (snd_seq_oss_synth_addr(dp, dev, ev))
 			return -EINVAL;
 		ev->data.ext.len = sysex->len;
 		ev->data.ext.ptr = sysex->buf;
 		sysex->len = 0;
 		return 0;
 	}

 	return -EINVAL; /* skip */
 }

 /*
  * fill the event source/destination addresses
  */
 int
 snd_seq_oss_synth_addr(struct seq_oss_devinfo *dp, int dev, struct snd_seq_event *ev)
 {
 	if (! snd_seq_oss_synth_is_valid(dp, dev))
 		return -EINVAL;
 	snd_seq_oss_fill_addr(dp, ev, dp->synths[dev].arg.addr.client,
 			      dp->synths[dev].arg.addr.port);
 	return 0;
 }


 /*
  * OSS compatible ioctl
  */
 int
 snd_seq_oss_synth_ioctl(struct seq_oss_devinfo *dp, int dev, unsigned int cmd, unsigned long addr)
 {
 	struct seq_oss_synth *rec;
 	int rc;

 	if (is_midi_dev(dp, dev))
 		return -ENXIO;
 	if ((rec = get_synthdev(dp, dev)) == NULL)
 		return -ENXIO;
 	if (rec->oper.ioctl == NULL)
 		rc = -ENXIO;
 	else
 		rc = rec->oper.ioctl(&dp->synths[dev].arg, cmd, addr);
 	snd_use_lock_free(&rec->use_lock);
 	return rc;
 }


 /*
  * send OSS raw events - SEQ_PRIVATE and SEQ_VOLUME
  */
 int
 snd_seq_oss_synth_raw_event(struct seq_oss_devinfo *dp, int dev, unsigned char *data, struct snd_seq_event *ev)
 {
 	if (! snd_seq_oss_synth_is_valid(dp, dev) || is_midi_dev(dp, dev))
 		return -ENXIO;
 	ev->type = SNDRV_SEQ_EVENT_OSS;
 	memcpy(ev->data.raw8.d, data, 8);
 	return snd_seq_oss_synth_addr(dp, dev, ev);
 }


 /*
  * create OSS compatible synth_info record
  */
 int
 snd_seq_oss_synth_make_info(struct seq_oss_devinfo *dp, int dev, struct synth_info *inf)
 {
 	struct seq_oss_synth *rec;

 	if (dev < 0 || dev >= dp->max_synthdev)
 		return -ENXIO;

 	if (dp->synths[dev].is_midi) {
 		struct midi_info minf;
 		snd_seq_oss_midi_make_info(dp, dp->synths[dev].midi_mapped, &minf);
 		inf->synth_type = SYNTH_TYPE_MIDI;
 		inf->synth_subtype = 0;
 		inf->nr_voices = 16;
 		inf->device = dev;
 		strlcpy(inf->name, minf.name, sizeof(inf->name));
 	} else {
 		if ((rec = get_synthdev(dp, dev)) == NULL)
 			return -ENXIO;
 		inf->synth_type = rec->synth_type;
 		inf->synth_subtype = rec->synth_subtype;
 		inf->nr_voices = rec->nr_voices;
 		inf->device = dev;
 		strlcpy(inf->name, rec->name, sizeof(inf->name));
 		snd_use_lock_free(&rec->use_lock);
 	}
 	return 0;
 }


 #ifdef CONFIG_SND_PROC_FS
 /*
  * proc interface
  */
 void
 snd_seq_oss_synth_info_read(struct snd_info_buffer *buf)
 {
 	int i;
 	struct seq_oss_synth *rec;

 	snd_iprintf(buf, "\nNumber of synth devices: %d\n", max_synth_devs);
 	for (i = 0; i < max_synth_devs; i++) {
 		snd_iprintf(buf, "\nsynth %d: ", i);
 		rec = get_sdev(i);
 		if (rec == NULL) {
 			snd_iprintf(buf, "*empty*\n");
 			continue;
 		}
 		snd_iprintf(buf, "[%s]\n", rec->name);
 		snd_iprintf(buf, "  type 0x%x : subtype 0x%x : voices %d\n",
 			    rec->synth_type, rec->synth_subtype,
 			    rec->nr_voices);
 		snd_iprintf(buf, "  capabilities : ioctl %s / load_patch %s\n",
 			    enabled_str((long)rec->oper.ioctl),
 			    enabled_str((long)rec->oper.load_patch));
 		snd_use_lock_free(&rec->use_lock);
 	}
 }
 #endif /* CONFIG_SND_PROC_FS */
	/*
	* OSS compatible sequencer driver
	*
	* synth device handlers
	*
	* Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/

	#include "seq_oss_synth.h"
	#include "seq_oss_midi.h"
	#include "../seq_lock.h"
	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/slab.h>

	/*
	* constants
	*/
	#define SNDRV_SEQ_OSS_MAX_SYNTH_NAME 30
	#define MAX_SYSEX_BUFLEN 128


	/*
	* definition of synth info records
	*/

	/* sysex buffer */
	struct seq_oss_synth_sysex {
	int len;
	int skip;
	unsigned char buf[MAX_SYSEX_BUFLEN];
	};

	/* synth info */
	struct seq_oss_synth {
	int seq_device;

	/* for synth_info */
	int synth_type;
	int synth_subtype;
	int nr_voices;

	char name[SNDRV_SEQ_OSS_MAX_SYNTH_NAME];
	struct snd_seq_oss_callback oper;

	int opened;

	void *private_data;
	snd_use_lock_t use_lock;
	};


	/*
	* device table
	*/
	static int max_synth_devs;
	static struct seq_oss_synth *synth_devs[SNDRV_SEQ_OSS_MAX_SYNTH_DEVS];
	static struct seq_oss_synth midi_synth_dev = {
	.seq_device = -1,
	.synth_type = SYNTH_TYPE_MIDI,
	.synth_subtype = 0,
	.nr_voices = 16,
	.name = "MIDI",
	};

	static DEFINE_SPINLOCK(register_lock);

	/*
	* prototypes
	*/
	static struct seq_oss_synth get_synthdev(struct seq_oss_devinfo dp, int dev);
	static void reset_channels(struct seq_oss_synthinfo *info);

	/*
	* global initialization
	*/
	void __init
	snd_seq_oss_synth_init(void)
	{
	snd_use_lock_init(&midi_synth_dev.use_lock);
	}

	/*
	* registration of the synth device
	*/
	int
	snd_seq_oss_synth_probe(struct device *_dev)
	{
	struct snd_seq_device *dev = to_seq_dev(_dev);
	int i;
	struct seq_oss_synth *rec;
	struct snd_seq_oss_reg *reg = SNDRV_SEQ_DEVICE_ARGPTR(dev);
	unsigned long flags;

	rec = kzalloc(sizeof(*rec), GFP_KERNEL);
	if (!rec)
	return -ENOMEM;
	rec->seq_device = -1;
	rec->synth_type = reg->type;
	rec->synth_subtype = reg->subtype;
	rec->nr_voices = reg->nvoices;
	rec->oper = reg->oper;
	rec->private_data = reg->private_data;
	rec->opened = 0;
	snd_use_lock_init(&rec->use_lock);

	/* copy and truncate the name of synth device */
	strlcpy(rec->name, dev->name, sizeof(rec->name));

	/* registration */
	spin_lock_irqsave(&register_lock, flags);
	for (i = 0; i < max_synth_devs; i++) {
	if (synth_devs[i] == NULL)
	break;
	}
	if (i >= max_synth_devs) {
	if (max_synth_devs >= SNDRV_SEQ_OSS_MAX_SYNTH_DEVS) {
	spin_unlock_irqrestore(&register_lock, flags);
	pr_err("ALSA: seq_oss: no more synth slot\n");
	kfree(rec);
	return -ENOMEM;
	}
	max_synth_devs++;
	}
	rec->seq_device = i;
	synth_devs[i] = rec;
	spin_unlock_irqrestore(&register_lock, flags);
	dev->driver_data = rec;
	#ifdef SNDRV_OSS_INFO_DEV_SYNTH
	if (i < SNDRV_CARDS)
	snd_oss_info_register(SNDRV_OSS_INFO_DEV_SYNTH, i, rec->name);
	#endif
	return 0;
	}


	int
	snd_seq_oss_synth_remove(struct device *_dev)
	{
	struct snd_seq_device *dev = to_seq_dev(_dev);
	int index;
	struct seq_oss_synth *rec = dev->driver_data;
	unsigned long flags;

	spin_lock_irqsave(&register_lock, flags);
	for (index = 0; index < max_synth_devs; index++) {
	if (synth_devs[index] == rec)
	break;
	}
	if (index >= max_synth_devs) {
	spin_unlock_irqrestore(&register_lock, flags);
	pr_err("ALSA: seq_oss: can't unregister synth\n");
	return -EINVAL;
	}
	synth_devs[index] = NULL;
	if (index == max_synth_devs - 1) {
	for (index--; index >= 0; index--) {
	if (synth_devs[index])
	break;
	}
	max_synth_devs = index + 1;
	}
	spin_unlock_irqrestore(&register_lock, flags);
	#ifdef SNDRV_OSS_INFO_DEV_SYNTH
	if (rec->seq_device < SNDRV_CARDS)
	snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_SYNTH, rec->seq_device);
	#endif

	snd_use_lock_sync(&rec->use_lock);
	kfree(rec);

	return 0;
	}


	/*
	*/
	static struct seq_oss_synth *
	get_sdev(int dev)
	{
	struct seq_oss_synth *rec;
	unsigned long flags;

	spin_lock_irqsave(&register_lock, flags);
	rec = synth_devs[dev];
	if (rec)
	snd_use_lock_use(&rec->use_lock);
	spin_unlock_irqrestore(&register_lock, flags);
	return rec;
	}


	/*
	* set up synth tables
	*/

	void
	snd_seq_oss_synth_setup(struct seq_oss_devinfo *dp)
	{
	int i;
	struct seq_oss_synth *rec;
	struct seq_oss_synthinfo *info;

	dp->max_synthdev = max_synth_devs;
	dp->synth_opened = 0;
	memset(dp->synths, 0, sizeof(dp->synths));
	for (i = 0; i < dp->max_synthdev; i++) {
	rec = get_sdev(i);
	if (rec == NULL)
	continue;
	if (rec->oper.open == NULL \|\| rec->oper.close == NULL) {
	snd_use_lock_free(&rec->use_lock);
	continue;
	}
	info = &dp->synths[i];
	info->arg.app_index = dp->port;
	info->arg.file_mode = dp->file_mode;
	info->arg.seq_mode = dp->seq_mode;
	if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_SYNTH)
	info->arg.event_passing = SNDRV_SEQ_OSS_PROCESS_EVENTS;
	else
	info->arg.event_passing = SNDRV_SEQ_OSS_PASS_EVENTS;
	info->opened = 0;
	if (!try_module_get(rec->oper.owner)) {
	snd_use_lock_free(&rec->use_lock);
	continue;
	}
	if (rec->oper.open(&info->arg, rec->private_data) < 0) {
	module_put(rec->oper.owner);
	snd_use_lock_free(&rec->use_lock);
	continue;
	}
	info->nr_voices = rec->nr_voices;
	if (info->nr_voices > 0) {
	info->ch = kcalloc(info->nr_voices, sizeof(struct seq_oss_chinfo), GFP_KERNEL);
	if (!info->ch) {
	rec->oper.close(&info->arg);
	module_put(rec->oper.owner);
	snd_use_lock_free(&rec->use_lock);
	continue;
	}
	reset_channels(info);
	}
	info->opened++;
	rec->opened++;
	dp->synth_opened++;
	snd_use_lock_free(&rec->use_lock);
	}
	}


	/*
	* set up synth tables for MIDI emulation - /dev/music mode only
	*/

	void
	snd_seq_oss_synth_setup_midi(struct seq_oss_devinfo *dp)
	{
	int i;

	if (dp->max_synthdev >= SNDRV_SEQ_OSS_MAX_SYNTH_DEVS)
	return;

	for (i = 0; i < dp->max_mididev; i++) {
	struct seq_oss_synthinfo *info;
	info = &dp->synths[dp->max_synthdev];
	if (snd_seq_oss_midi_open(dp, i, dp->file_mode) < 0)
	continue;
	info->arg.app_index = dp->port;
	info->arg.file_mode = dp->file_mode;
	info->arg.seq_mode = dp->seq_mode;
	info->arg.private_data = info;
	info->is_midi = 1;
	info->midi_mapped = i;
	info->arg.event_passing = SNDRV_SEQ_OSS_PASS_EVENTS;
	snd_seq_oss_midi_get_addr(dp, i, &info->arg.addr);
	info->opened = 1;
	midi_synth_dev.opened++;
	dp->max_synthdev++;
	if (dp->max_synthdev >= SNDRV_SEQ_OSS_MAX_SYNTH_DEVS)
	break;
	}
	}


	/*
	* clean up synth tables
	*/

	void
	snd_seq_oss_synth_cleanup(struct seq_oss_devinfo *dp)
	{
	int i;
	struct seq_oss_synth *rec;
	struct seq_oss_synthinfo *info;

	if (snd_BUG_ON(dp->max_synthdev > SNDRV_SEQ_OSS_MAX_SYNTH_DEVS))
	return;
	for (i = 0; i < dp->max_synthdev; i++) {
	info = &dp->synths[i];
	if (! info->opened)
	continue;
	if (info->is_midi) {
	if (midi_synth_dev.opened > 0) {
	snd_seq_oss_midi_close(dp, info->midi_mapped);
	midi_synth_dev.opened--;
	}
	} else {
	rec = get_sdev(i);
	if (rec == NULL)
	continue;
	if (rec->opened > 0) {
	rec->oper.close(&info->arg);
	module_put(rec->oper.owner);
	rec->opened = 0;
	}
	snd_use_lock_free(&rec->use_lock);
	}
	kfree(info->sysex);
	info->sysex = NULL;
	kfree(info->ch);
	info->ch = NULL;
	}
	dp->synth_opened = 0;
	dp->max_synthdev = 0;
	}

	/*
	* check if the specified device is MIDI mapped device
	*/
	static int
	is_midi_dev(struct seq_oss_devinfo *dp, int dev)
	{
	if (dev < 0 \|\| dev >= dp->max_synthdev)
	return 0;
	if (dp->synths[dev].is_midi)
	return 1;
	return 0;
	}

	/*
	* return synth device information pointer
	*/
	static struct seq_oss_synth *
	get_synthdev(struct seq_oss_devinfo *dp, int dev)
	{
	struct seq_oss_synth *rec;
	if (dev < 0 \|\| dev >= dp->max_synthdev)
	return NULL;
	if (! dp->synths[dev].opened)
	return NULL;
	if (dp->synths[dev].is_midi)
	return &midi_synth_dev;
	if ((rec = get_sdev(dev)) == NULL)
	return NULL;
	if (! rec->opened) {
	snd_use_lock_free(&rec->use_lock);
	return NULL;
	}
	return rec;
	}


	/*
	* reset note and velocity on each channel.
	*/
	static void
	reset_channels(struct seq_oss_synthinfo *info)
	{
	int i;
	if (info->ch == NULL \|\| ! info->nr_voices)
	return;
	for (i = 0; i < info->nr_voices; i++) {
	info->ch[i].note = -1;
	info->ch[i].vel = 0;
	}
	}


	/*
	* reset synth device:
	* call reset callback. if no callback is defined, send a heartbeat
	* event to the corresponding port.
	*/
	void
	snd_seq_oss_synth_reset(struct seq_oss_devinfo *dp, int dev)
	{
	struct seq_oss_synth *rec;
	struct seq_oss_synthinfo *info;

	if (snd_BUG_ON(dev < 0 \|\| dev >= dp->max_synthdev))
	return;
	info = &dp->synths[dev];
	if (! info->opened)
	return;
	if (info->sysex)
	info->sysex->len = 0; /* reset sysex */
	reset_channels(info);
	if (info->is_midi) {
	if (midi_synth_dev.opened <= 0)
	return;
	snd_seq_oss_midi_reset(dp, info->midi_mapped);
	/* reopen the device */
	snd_seq_oss_midi_close(dp, dev);
	if (snd_seq_oss_midi_open(dp, info->midi_mapped,
	dp->file_mode) < 0) {
	midi_synth_dev.opened--;
	info->opened = 0;
	kfree(info->sysex);
	info->sysex = NULL;
	kfree(info->ch);
	info->ch = NULL;
	}
	return;
	}

	rec = get_sdev(dev);
	if (rec == NULL)
	return;
	if (rec->oper.reset) {
	rec->oper.reset(&info->arg);
	} else {
	struct snd_seq_event ev;
	memset(&ev, 0, sizeof(ev));
	snd_seq_oss_fill_addr(dp, &ev, info->arg.addr.client,
	info->arg.addr.port);
	ev.type = SNDRV_SEQ_EVENT_RESET;
	snd_seq_oss_dispatch(dp, &ev, 0, 0);
	}
	snd_use_lock_free(&rec->use_lock);
	}


	/*
	* load a patch record:
	* call load_patch callback function
	*/
	int
	snd_seq_oss_synth_load_patch(struct seq_oss_devinfo *dp, int dev, int fmt,
	const char __user *buf, int p, int c)
	{
	struct seq_oss_synth *rec;
	int rc;

	if (dev < 0 \|\| dev >= dp->max_synthdev)
	return -ENXIO;

	if (is_midi_dev(dp, dev))
	return 0;
	if ((rec = get_synthdev(dp, dev)) == NULL)
	return -ENXIO;

	if (rec->oper.load_patch == NULL)
	rc = -ENXIO;
	else
	rc = rec->oper.load_patch(&dp->synths[dev].arg, fmt, buf, p, c);
	snd_use_lock_free(&rec->use_lock);
	return rc;
	}

	/*
	* check if the device is valid synth device
	*/
	int
	snd_seq_oss_synth_is_valid(struct seq_oss_devinfo *dp, int dev)
	{
	struct seq_oss_synth *rec;
	rec = get_synthdev(dp, dev);
	if (rec) {
	snd_use_lock_free(&rec->use_lock);
	return 1;
	}
	return 0;
	}


	/*
	* receive OSS 6 byte sysex packet:
	* the full sysex message will be sent if it reaches to the end of data
	* (0xff).
	*/
	int
	snd_seq_oss_synth_sysex(struct seq_oss_devinfo dp, int dev, unsigned char buf, struct snd_seq_event *ev)
	{
	int i, send;
	unsigned char *dest;
	struct seq_oss_synth_sysex *sysex;

	if (! snd_seq_oss_synth_is_valid(dp, dev))
	return -ENXIO;

	sysex = dp->synths[dev].sysex;
	if (sysex == NULL) {
	sysex = kzalloc(sizeof(*sysex), GFP_KERNEL);
	if (sysex == NULL)
	return -ENOMEM;
	dp->synths[dev].sysex = sysex;
	}

	send = 0;
	dest = sysex->buf + sysex->len;
	/* copy 6 byte packet to the buffer */
	for (i = 0; i < 6; i++) {
	if (buf[i] == 0xff) {
	send = 1;
	break;
	}
	dest[i] = buf[i];
	sysex->len++;
	if (sysex->len >= MAX_SYSEX_BUFLEN) {
	sysex->len = 0;
	sysex->skip = 1;
	break;
	}
	}

	if (sysex->len && send) {
	if (sysex->skip) {
	sysex->skip = 0;
	sysex->len = 0;
	return -EINVAL; /* skip */
	}
	/* copy the data to event record and send it */
	ev->flags = SNDRV_SEQ_EVENT_LENGTH_VARIABLE;
	if (snd_seq_oss_synth_addr(dp, dev, ev))
	return -EINVAL;
	ev->data.ext.len = sysex->len;
	ev->data.ext.ptr = sysex->buf;
	sysex->len = 0;
	return 0;
	}

	return -EINVAL; /* skip */
	}

	/*
	* fill the event source/destination addresses
	*/
	int
	snd_seq_oss_synth_addr(struct seq_oss_devinfo dp, int dev, struct snd_seq_event ev)
	{
	if (! snd_seq_oss_synth_is_valid(dp, dev))
	return -EINVAL;
	snd_seq_oss_fill_addr(dp, ev, dp->synths[dev].arg.addr.client,
	dp->synths[dev].arg.addr.port);
	return 0;
	}


	/*
	* OSS compatible ioctl
	*/
	int
	snd_seq_oss_synth_ioctl(struct seq_oss_devinfo *dp, int dev, unsigned int cmd, unsigned long addr)
	{
	struct seq_oss_synth *rec;
	int rc;

	if (is_midi_dev(dp, dev))
	return -ENXIO;
	if ((rec = get_synthdev(dp, dev)) == NULL)
	return -ENXIO;
	if (rec->oper.ioctl == NULL)
	rc = -ENXIO;
	else
	rc = rec->oper.ioctl(&dp->synths[dev].arg, cmd, addr);
	snd_use_lock_free(&rec->use_lock);
	return rc;
	}


	/*
	* send OSS raw events - SEQ_PRIVATE and SEQ_VOLUME
	*/
	int
	snd_seq_oss_synth_raw_event(struct seq_oss_devinfo dp, int dev, unsigned char data, struct snd_seq_event *ev)
	{
	if (! snd_seq_oss_synth_is_valid(dp, dev) \|\| is_midi_dev(dp, dev))
	return -ENXIO;
	ev->type = SNDRV_SEQ_EVENT_OSS;
	memcpy(ev->data.raw8.d, data, 8);
	return snd_seq_oss_synth_addr(dp, dev, ev);
	}


	/*
	* create OSS compatible synth_info record
	*/
	int
	snd_seq_oss_synth_make_info(struct seq_oss_devinfo dp, int dev, struct synth_info inf)
	{
	struct seq_oss_synth *rec;

	if (dev < 0 \|\| dev >= dp->max_synthdev)
	return -ENXIO;

	if (dp->synths[dev].is_midi) {
	struct midi_info minf;
	snd_seq_oss_midi_make_info(dp, dp->synths[dev].midi_mapped, &minf);
	inf->synth_type = SYNTH_TYPE_MIDI;
	inf->synth_subtype = 0;
	inf->nr_voices = 16;
	inf->device = dev;
	strlcpy(inf->name, minf.name, sizeof(inf->name));
	} else {
	if ((rec = get_synthdev(dp, dev)) == NULL)
	return -ENXIO;
	inf->synth_type = rec->synth_type;
	inf->synth_subtype = rec->synth_subtype;
	inf->nr_voices = rec->nr_voices;
	inf->device = dev;
	strlcpy(inf->name, rec->name, sizeof(inf->name));
	snd_use_lock_free(&rec->use_lock);
	}
	return 0;
	}


	#ifdef CONFIG_SND_PROC_FS
	/*
	* proc interface
	*/
	void
	snd_seq_oss_synth_info_read(struct snd_info_buffer *buf)
	{
	int i;
	struct seq_oss_synth *rec;

	snd_iprintf(buf, "\nNumber of synth devices: %d\n", max_synth_devs);
	for (i = 0; i < max_synth_devs; i++) {
	snd_iprintf(buf, "\nsynth %d: ", i);
	rec = get_sdev(i);
	if (rec == NULL) {
	snd_iprintf(buf, "empty\n");
	continue;
	}
	snd_iprintf(buf, "[%s]\n", rec->name);
	snd_iprintf(buf, " type 0x%x : subtype 0x%x : voices %d\n",
	rec->synth_type, rec->synth_subtype,
	rec->nr_voices);
	snd_iprintf(buf, " capabilities : ioctl %s / load_patch %s\n",
	enabled_str((long)rec->oper.ioctl),
	enabled_str((long)rec->oper.load_patch));
	snd_use_lock_free(&rec->use_lock);
	}
	}
	#endif /* CONFIG_SND_PROC_FS */