sound/core/sound_oss.c - kernel/msm-4.19 - Gitiles

 /*
  *  Advanced Linux Sound Architecture
  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
  *
  *
  *   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 <sound/driver.h>

 #ifdef CONFIG_SND_OSSEMUL

 #if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
 #error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
 #endif

 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/time.h>
 #include <sound/core.h>
 #include <sound/minors.h>
 #include <sound/info.h>
 #include <linux/sound.h>

 #define SNDRV_OS_MINORS		256

 static struct list_head snd_oss_minors_hash[SNDRV_CARDS];

 static DECLARE_MUTEX(sound_oss_mutex);

 static struct snd_minor *snd_oss_minor_search(int minor)
 {
 	struct list_head *list;
 	struct snd_minor *mptr;

 	list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
 		mptr = list_entry(list, struct snd_minor, list);
 		if (mptr->number == minor)
 			return mptr;
 	}
 	return NULL;
 }

 static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
 {
 	int minor;

 	switch (type) {
 	case SNDRV_OSS_DEVICE_TYPE_MIXER:
 		snd_assert(card != NULL && dev <= 1, return -EINVAL);
 		minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
 		break;
 	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
 		minor = SNDRV_MINOR_OSS_SEQUENCER;
 		break;
 	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
 		minor = SNDRV_MINOR_OSS_MUSIC;
 		break;
 	case SNDRV_OSS_DEVICE_TYPE_PCM:
 		snd_assert(card != NULL && dev <= 1, return -EINVAL);
 		minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
 		break;
 	case SNDRV_OSS_DEVICE_TYPE_MIDI:
 		snd_assert(card != NULL && dev <= 1, return -EINVAL);
 		minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
 		break;
 	case SNDRV_OSS_DEVICE_TYPE_DMFM:
 		minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
 		break;
 	case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
 		minor = SNDRV_MINOR_OSS_SNDSTAT;
 		break;
 	default:
 		return -EINVAL;
 	}
 	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
 	return minor;
 }

 int snd_register_oss_device(int type, struct snd_card *card, int dev,
 			    struct snd_minor * reg, const char *name)
 {
 	int minor = snd_oss_kernel_minor(type, card, dev);
 	int minor_unit;
 	struct snd_minor *preg;
 	int cidx = SNDRV_MINOR_OSS_CARD(minor);
 	int track2 = -1;
 	int register1 = -1, register2 = -1;
 	struct device *carddev = NULL;

 	if (minor < 0)
 		return minor;
 	preg = (struct snd_minor *)kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
 	if (preg == NULL)
 		return -ENOMEM;
 	*preg = *reg;
 	preg->number = minor;
 	preg->device = dev;
 	down(&sound_oss_mutex);
 	list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
 	minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
 	switch (minor_unit) {
 	case SNDRV_MINOR_OSS_PCM:
 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 		break;
 	case SNDRV_MINOR_OSS_MIDI:
 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 		break;
 	case SNDRV_MINOR_OSS_MIDI1:
 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 		break;
 	}
 	if (card)
 		carddev = card->dev;
 	register1 = register_sound_special_device(reg->f_ops, minor, carddev);
 	if (register1 != minor)
 		goto __end;
 	if (track2 >= 0) {
 		register2 = register_sound_special_device(reg->f_ops, track2, carddev);
 		if (register2 != track2)
 			goto __end;
 	}
 	up(&sound_oss_mutex);
 	return 0;

       __end:
       	if (register2 >= 0)
       		unregister_sound_special(register2);
       	if (register1 >= 0)
       		unregister_sound_special(register1);
       	list_del(&preg->list);
 	up(&sound_oss_mutex);
 	kfree(preg);
       	return -EBUSY;
 }

 int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 {
 	int minor = snd_oss_kernel_minor(type, card, dev);
 	int cidx = SNDRV_MINOR_OSS_CARD(minor);
 	int track2 = -1;
 	struct snd_minor *mptr;

 	if (minor < 0)
 		return minor;
 	down(&sound_oss_mutex);
 	mptr = snd_oss_minor_search(minor);
 	if (mptr == NULL) {
 		up(&sound_oss_mutex);
 		return -ENOENT;
 	}
 	unregister_sound_special(minor);
 	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
 	case SNDRV_MINOR_OSS_PCM:
 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
 		break;
 	case SNDRV_MINOR_OSS_MIDI:
 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
 		break;
 	case SNDRV_MINOR_OSS_MIDI1:
 		track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
 		break;
 	}
 	if (track2 >= 0)
 		unregister_sound_special(track2);
 	list_del(&mptr->list);
 	up(&sound_oss_mutex);
 	kfree(mptr);
 	return 0;
 }

 /*
  *  INFO PART
  */

 #ifdef CONFIG_PROC_FS

 static struct snd_info_entry *snd_minor_info_oss_entry = NULL;

 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 				    struct snd_info_buffer *buffer)
 {
 	int card, dev;
 	struct list_head *list;
 	struct snd_minor *mptr;

 	down(&sound_oss_mutex);
 	for (card = 0; card < SNDRV_CARDS; card++) {
 		list_for_each(list, &snd_oss_minors_hash[card]) {
 			mptr = list_entry(list, struct snd_minor, list);
 			dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
 		        if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
 			    dev != SNDRV_MINOR_OSS_SEQUENCER &&
 			    dev != SNDRV_MINOR_OSS_MUSIC)
 				snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
 			else
 				snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
 		}
 	}
 	up(&sound_oss_mutex);
 }

 #endif /* CONFIG_PROC_FS */

 int __init snd_minor_info_oss_init(void)
 {
 #ifdef CONFIG_PROC_FS
 	struct snd_info_entry *entry;

 	entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
 	if (entry) {
 		entry->c.text.read_size = PAGE_SIZE;
 		entry->c.text.read = snd_minor_info_oss_read;
 		if (snd_info_register(entry) < 0) {
 			snd_info_free_entry(entry);
 			entry = NULL;
 		}
 	}
 	snd_minor_info_oss_entry = entry;
 #endif
 	return 0;
 }

 int __exit snd_minor_info_oss_done(void)
 {
 #ifdef CONFIG_PROC_FS
 	if (snd_minor_info_oss_entry)
 		snd_info_unregister(snd_minor_info_oss_entry);
 #endif
 	return 0;
 }

 int __init snd_oss_init_module(void)
 {
 	int card;

 	for (card = 0; card < SNDRV_CARDS; card++)
 		INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
 	return 0;
 }

 #endif /* CONFIG_SND_OSSEMUL */
	/*
	* Advanced Linux Sound Architecture
	* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
	*
	*
	* 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 <sound/driver.h>

	#ifdef CONFIG_SND_OSSEMUL

	#if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
	#error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
	#endif

	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/time.h>
	#include <sound/core.h>
	#include <sound/minors.h>
	#include <sound/info.h>
	#include <linux/sound.h>

	#define SNDRV_OS_MINORS 256

	static struct list_head snd_oss_minors_hash[SNDRV_CARDS];

	static DECLARE_MUTEX(sound_oss_mutex);

	static struct snd_minor *snd_oss_minor_search(int minor)
	{
	struct list_head *list;
	struct snd_minor *mptr;

	list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
	mptr = list_entry(list, struct snd_minor, list);
	if (mptr->number == minor)
	return mptr;
	}
	return NULL;
	}

	static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
	{
	int minor;

	switch (type) {
	case SNDRV_OSS_DEVICE_TYPE_MIXER:
	snd_assert(card != NULL && dev <= 1, return -EINVAL);
	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
	break;
	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
	minor = SNDRV_MINOR_OSS_SEQUENCER;
	break;
	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
	minor = SNDRV_MINOR_OSS_MUSIC;
	break;
	case SNDRV_OSS_DEVICE_TYPE_PCM:
	snd_assert(card != NULL && dev <= 1, return -EINVAL);
	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
	break;
	case SNDRV_OSS_DEVICE_TYPE_MIDI:
	snd_assert(card != NULL && dev <= 1, return -EINVAL);
	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
	break;
	case SNDRV_OSS_DEVICE_TYPE_DMFM:
	minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
	break;
	case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
	minor = SNDRV_MINOR_OSS_SNDSTAT;
	break;
	default:
	return -EINVAL;
	}
	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	return minor;
	}

	int snd_register_oss_device(int type, struct snd_card *card, int dev,
	struct snd_minor * reg, const char *name)
	{
	int minor = snd_oss_kernel_minor(type, card, dev);
	int minor_unit;
	struct snd_minor *preg;
	int cidx = SNDRV_MINOR_OSS_CARD(minor);
	int track2 = -1;
	int register1 = -1, register2 = -1;
	struct device *carddev = NULL;

	if (minor < 0)
	return minor;
	preg = (struct snd_minor *)kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
	if (preg == NULL)
	return -ENOMEM;
	preg = reg;
	preg->number = minor;
	preg->device = dev;
	down(&sound_oss_mutex);
	list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
	minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
	switch (minor_unit) {
	case SNDRV_MINOR_OSS_PCM:
	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
	break;
	case SNDRV_MINOR_OSS_MIDI:
	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
	break;
	case SNDRV_MINOR_OSS_MIDI1:
	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
	break;
	}
	if (card)
	carddev = card->dev;
	register1 = register_sound_special_device(reg->f_ops, minor, carddev);
	if (register1 != minor)
	goto __end;
	if (track2 >= 0) {
	register2 = register_sound_special_device(reg->f_ops, track2, carddev);
	if (register2 != track2)
	goto __end;
	}
	up(&sound_oss_mutex);
	return 0;

	__end:
	if (register2 >= 0)
	unregister_sound_special(register2);
	if (register1 >= 0)
	unregister_sound_special(register1);
	list_del(&preg->list);
	up(&sound_oss_mutex);
	kfree(preg);
	return -EBUSY;
	}

	int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
	{
	int minor = snd_oss_kernel_minor(type, card, dev);
	int cidx = SNDRV_MINOR_OSS_CARD(minor);
	int track2 = -1;
	struct snd_minor *mptr;

	if (minor < 0)
	return minor;
	down(&sound_oss_mutex);
	mptr = snd_oss_minor_search(minor);
	if (mptr == NULL) {
	up(&sound_oss_mutex);
	return -ENOENT;
	}
	unregister_sound_special(minor);
	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
	case SNDRV_MINOR_OSS_PCM:
	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
	break;
	case SNDRV_MINOR_OSS_MIDI:
	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
	break;
	case SNDRV_MINOR_OSS_MIDI1:
	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
	break;
	}
	if (track2 >= 0)
	unregister_sound_special(track2);
	list_del(&mptr->list);
	up(&sound_oss_mutex);
	kfree(mptr);
	return 0;
	}

	/*
	* INFO PART
	*/

	#ifdef CONFIG_PROC_FS

	static struct snd_info_entry *snd_minor_info_oss_entry = NULL;

	static void snd_minor_info_oss_read(struct snd_info_entry *entry,
	struct snd_info_buffer *buffer)
	{
	int card, dev;
	struct list_head *list;
	struct snd_minor *mptr;

	down(&sound_oss_mutex);
	for (card = 0; card < SNDRV_CARDS; card++) {
	list_for_each(list, &snd_oss_minors_hash[card]) {
	mptr = list_entry(list, struct snd_minor, list);
	dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
	if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
	dev != SNDRV_MINOR_OSS_SEQUENCER &&
	dev != SNDRV_MINOR_OSS_MUSIC)
	snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
	else
	snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment);
	}
	}
	up(&sound_oss_mutex);
	}

	#endif /* CONFIG_PROC_FS */

	int __init snd_minor_info_oss_init(void)
	{
	#ifdef CONFIG_PROC_FS
	struct snd_info_entry *entry;

	entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
	if (entry) {
	entry->c.text.read_size = PAGE_SIZE;
	entry->c.text.read = snd_minor_info_oss_read;
	if (snd_info_register(entry) < 0) {
	snd_info_free_entry(entry);
	entry = NULL;
	}
	}
	snd_minor_info_oss_entry = entry;
	#endif
	return 0;
	}

	int __exit snd_minor_info_oss_done(void)
	{
	#ifdef CONFIG_PROC_FS
	if (snd_minor_info_oss_entry)
	snd_info_unregister(snd_minor_info_oss_entry);
	#endif
	return 0;
	}

	int __init snd_oss_init_module(void)
	{
	int card;

	for (card = 0; card < SNDRV_CARDS; card++)
	INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
	return 0;
	}

	#endif /* CONFIG_SND_OSSEMUL */