[linux.git] / sound / core / sound_oss.c

/*
 *  Advanced Linux Sound Architecture
 *  Copyright (c) by Jaroslav Kysela <[email protected]>
 *
 *
 *   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
 *
 */

#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/export.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>
#include <linux/mutex.h>

#define SNDRV_OSS_MINORS 256

static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
static DEFINE_MUTEX(sound_oss_mutex);

void *snd_lookup_oss_minor_data(unsigned int minor, int type)
{
	struct snd_minor *mreg;
	void *private_data;

	if (minor >= ARRAY_SIZE(snd_oss_minors))
		return NULL;
	mutex_lock(&sound_oss_mutex);
	mreg = snd_oss_minors[minor];
	if (mreg && mreg->type == type)
		private_data = mreg->private_data;
	else
		private_data = NULL;
	mutex_unlock(&sound_oss_mutex);
	return private_data;
}

EXPORT_SYMBOL(snd_lookup_oss_minor_data);

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

	switch (type) {
	case SNDRV_OSS_DEVICE_TYPE_MIXER:
		if (snd_BUG_ON(!card || dev < 0 || 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:
		if (snd_BUG_ON(!card || dev < 0 || 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:
		if (snd_BUG_ON(!card || dev < 0 || 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;
	}
	if (minor < 0 || minor >= SNDRV_OSS_MINORS)
		return -EINVAL;
	return minor;
}

int snd_register_oss_device(int type, struct snd_card *card, int dev,
			    const struct file_operations *f_ops, void *private_data,
			    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 = snd_card_get_device_link(card);

	if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
		return 0; /* ignore silently */
	if (minor < 0)
		return minor;
	preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
	if (preg == NULL)
		return -ENOMEM;
	preg->type = type;
	preg->card = card ? card->number : -1;
	preg->device = dev;
	preg->f_ops = f_ops;
	preg->private_data = private_data;
	mutex_lock(&sound_oss_mutex);
	snd_oss_minors[minor] = preg;
	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;
	}
	register1 = register_sound_special_device(f_ops, minor, carddev);
	if (register1 != minor)
		goto __end;
	if (track2 >= 0) {
		register2 = register_sound_special_device(f_ops, track2,
							  carddev);
		if (register2 != track2)
			goto __end;
		snd_oss_minors[track2] = preg;
	}
	mutex_unlock(&sound_oss_mutex);
	return 0;

      __end:
      	if (register2 >= 0)
      		unregister_sound_special(register2);
      	if (register1 >= 0)
      		unregister_sound_special(register1);
	snd_oss_minors[minor] = NULL;
	mutex_unlock(&sound_oss_mutex);
	kfree(preg);
      	return -EBUSY;
}

EXPORT_SYMBOL(snd_register_oss_device);

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 (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
		return 0;
	if (minor < 0)
		return minor;
	mutex_lock(&sound_oss_mutex);
	mptr = snd_oss_minors[minor];
	if (mptr == NULL) {
		mutex_unlock(&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);
		snd_oss_minors[track2] = NULL;
	}
	snd_oss_minors[minor] = NULL;
	mutex_unlock(&sound_oss_mutex);
	kfree(mptr);
	return 0;
}

EXPORT_SYMBOL(snd_unregister_oss_device);

/*
 *  INFO PART
 */

#ifdef CONFIG_PROC_FS

static struct snd_info_entry *snd_minor_info_oss_entry;

static const char *snd_oss_device_type_name(int type)
{
	switch (type) {
	case SNDRV_OSS_DEVICE_TYPE_MIXER:
		return "mixer";
	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
		return "sequencer";
	case SNDRV_OSS_DEVICE_TYPE_PCM:
		return "digital audio";
	case SNDRV_OSS_DEVICE_TYPE_MIDI:
		return "raw midi";
	case SNDRV_OSS_DEVICE_TYPE_DMFM:
		return "hardware dependent";
	default:
		return "?";
	}
}

static void snd_minor_info_oss_read(struct snd_info_entry *entry,
				    struct snd_info_buffer *buffer)
{
	int minor;
	struct snd_minor *mptr;

	mutex_lock(&sound_oss_mutex);
	for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
		if (!(mptr = snd_oss_minors[minor]))
			continue;
		if (mptr->card >= 0)
			snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
				    mptr->card, mptr->device,
				    snd_oss_device_type_name(mptr->type));
		else
			snd_iprintf(buffer, "%3i:       : %s\n", minor,
				    snd_oss_device_type_name(mptr->type));
	}
	mutex_unlock(&sound_oss_mutex);
}


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

	entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
	if (entry) {
		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;
	return 0;
}

int __exit snd_minor_info_oss_done(void)
{
	snd_info_free_entry(snd_minor_info_oss_entry);
	return 0;
}
#endif /* CONFIG_PROC_FS */

#endif /* CONFIG_SND_OSSEMUL */
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* Advanced Linux Sound Architecture
c1017a4c	3	* Copyright (c) by Jaroslav Kysela <[email protected]>
1da177e4 LT	4	*
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
1da177e4 LT	22	#ifdef CONFIG_SND_OSSEMUL
	23
	24	#if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
	25	#error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
	26	#endif
	27
	28	#include <linux/init.h>
d81a6d71	29	#include <linux/export.h>
1da177e4 LT	30	#include <linux/slab.h>
	31	#include <linux/time.h>
	32	#include <sound/core.h>
	33	#include <sound/minors.h>
	34	#include <sound/info.h>
	35	#include <linux/sound.h>
1a60d4c5	36	#include <linux/mutex.h>
1da177e4	37
779ae5a0	38	#define SNDRV_OSS_MINORS 256
1da177e4	39
6983b724	40	static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
1a60d4c5	41	static DEFINE_MUTEX(sound_oss_mutex);
1da177e4	42
f87135f5 CL	43	void *snd_lookup_oss_minor_data(unsigned int minor, int type)
	44	{
	45	struct snd_minor *mreg;
	46	void *private_data;
	47
3a63e444	48	if (minor >= ARRAY_SIZE(snd_oss_minors))
f87135f5	49	return NULL;
1a60d4c5	50	mutex_lock(&sound_oss_mutex);
f87135f5 CL	51	mreg = snd_oss_minors[minor];
	52	if (mreg && mreg->type == type)
	53	private_data = mreg->private_data;
	54	else
	55	private_data = NULL;
1a60d4c5	56	mutex_unlock(&sound_oss_mutex);
f87135f5 CL	57	return private_data;
	58	}
	59
c0d3fb39 TI	60	EXPORT_SYMBOL(snd_lookup_oss_minor_data);
c0d3fb39 TI	61
174c1f65	62	static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	63	{
	64	int minor;
	65
	66	switch (type) {
	67	case SNDRV_OSS_DEVICE_TYPE_MIXER:
7eaa943c TI	68	if (snd_BUG_ON(!card \|\| dev < 0 \|\| dev > 1))
7eaa943c TI	69	return -EINVAL;
1da177e4 LT	70	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
	71	break;
	72	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
	73	minor = SNDRV_MINOR_OSS_SEQUENCER;
	74	break;
	75	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
	76	minor = SNDRV_MINOR_OSS_MUSIC;
	77	break;
	78	case SNDRV_OSS_DEVICE_TYPE_PCM:
7eaa943c TI	79	if (snd_BUG_ON(!card \|\| dev < 0 \|\| dev > 1))
7eaa943c TI	80	return -EINVAL;
1da177e4 LT	81	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
	82	break;
	83	case SNDRV_OSS_DEVICE_TYPE_MIDI:
7eaa943c TI	84	if (snd_BUG_ON(!card \|\| dev < 0 \|\| dev > 1))
7eaa943c TI	85	return -EINVAL;
1da177e4 LT	86	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
	87	break;
	88	case SNDRV_OSS_DEVICE_TYPE_DMFM:
	89	minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
	90	break;
	91	case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
	92	minor = SNDRV_MINOR_OSS_SNDSTAT;
	93	break;
	94	default:
	95	return -EINVAL;
	96	}
808c569f	97	if (minor < 0 \|\| minor >= SNDRV_OSS_MINORS)
7eaa943c	98	return -EINVAL;
1da177e4 LT	99	return minor;
	100	}
	101
174c1f65	102	int snd_register_oss_device(int type, struct snd_card *card, int dev,
99ac48f5	103	const struct file_operations f_ops, void private_data,
f87135f5	104	const char *name)
1da177e4 LT	105	{
	106	int minor = snd_oss_kernel_minor(type, card, dev);
	107	int minor_unit;
174c1f65	108	struct snd_minor *preg;
1da177e4 LT	109	int cidx = SNDRV_MINOR_OSS_CARD(minor);
	110	int track2 = -1;
	111	int register1 = -1, register2 = -1;
7d2aae1e	112	struct device *carddev = snd_card_get_device_link(card);
1da177e4	113
779ae5a0	114	if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
d001544d	115	return 0; /* ignore silently */
1da177e4 LT	116	if (minor < 0)
1da177e4 LT	117	return minor;
6983b724	118	preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
1da177e4 LT	119	if (preg == NULL)
1da177e4 LT	120	return -ENOMEM;
2af677fc	121	preg->type = type;
6983b724	122	preg->card = card ? card->number : -1;
1da177e4	123	preg->device = dev;
2af677fc	124	preg->f_ops = f_ops;
f87135f5	125	preg->private_data = private_data;
1a60d4c5	126	mutex_lock(&sound_oss_mutex);
6983b724	127	snd_oss_minors[minor] = preg;
1da177e4 LT	128	minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
	129	switch (minor_unit) {
	130	case SNDRV_MINOR_OSS_PCM:
	131	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
	132	break;
	133	case SNDRV_MINOR_OSS_MIDI:
	134	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
	135	break;
	136	case SNDRV_MINOR_OSS_MIDI1:
	137	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
	138	break;
	139	}
2af677fc	140	register1 = register_sound_special_device(f_ops, minor, carddev);
1da177e4 LT	141	if (register1 != minor)
	142	goto __end;
	143	if (track2 >= 0) {
2af677fc CL	144	register2 = register_sound_special_device(f_ops, track2,
2af677fc CL	145	carddev);
1da177e4 LT	146	if (register2 != track2)
1da177e4 LT	147	goto __end;
f87135f5	148	snd_oss_minors[track2] = preg;
1da177e4	149	}
1a60d4c5	150	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	151	return 0;
	152
	153	__end:
	154	if (register2 >= 0)
	155	unregister_sound_special(register2);
	156	if (register1 >= 0)
	157	unregister_sound_special(register1);
6983b724	158	snd_oss_minors[minor] = NULL;
1a60d4c5	159	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	160	kfree(preg);
	161	return -EBUSY;
	162	}
	163
c0d3fb39 TI	164	EXPORT_SYMBOL(snd_register_oss_device);
c0d3fb39 TI	165
174c1f65	166	int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
1da177e4 LT	167	{
	168	int minor = snd_oss_kernel_minor(type, card, dev);
	169	int cidx = SNDRV_MINOR_OSS_CARD(minor);
	170	int track2 = -1;
174c1f65	171	struct snd_minor *mptr;
1da177e4	172
779ae5a0	173	if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
d001544d	174	return 0;
1da177e4 LT	175	if (minor < 0)
1da177e4 LT	176	return minor;
1a60d4c5	177	mutex_lock(&sound_oss_mutex);
6983b724	178	mptr = snd_oss_minors[minor];
1da177e4	179	if (mptr == NULL) {
1a60d4c5	180	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	181	return -ENOENT;
	182	}
	183	unregister_sound_special(minor);
	184	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
	185	case SNDRV_MINOR_OSS_PCM:
	186	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
	187	break;
	188	case SNDRV_MINOR_OSS_MIDI:
	189	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
	190	break;
	191	case SNDRV_MINOR_OSS_MIDI1:
	192	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
	193	break;
	194	}
f87135f5	195	if (track2 >= 0) {
1da177e4	196	unregister_sound_special(track2);
f87135f5 CL	197	snd_oss_minors[track2] = NULL;
f87135f5 CL	198	}
6983b724	199	snd_oss_minors[minor] = NULL;
1a60d4c5	200	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	201	kfree(mptr);
	202	return 0;
	203	}
	204
c0d3fb39 TI	205	EXPORT_SYMBOL(snd_unregister_oss_device);
c0d3fb39 TI	206
1da177e4 LT	207	/*
	208	* INFO PART
	209	*/
	210
	211	#ifdef CONFIG_PROC_FS
	212
6581f4e7	213	static struct snd_info_entry *snd_minor_info_oss_entry;
1da177e4	214
2af677fc CL	215	static const char *snd_oss_device_type_name(int type)
	216	{
	217	switch (type) {
	218	case SNDRV_OSS_DEVICE_TYPE_MIXER:
	219	return "mixer";
	220	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
	221	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
	222	return "sequencer";
	223	case SNDRV_OSS_DEVICE_TYPE_PCM:
	224	return "digital audio";
	225	case SNDRV_OSS_DEVICE_TYPE_MIDI:
	226	return "raw midi";
	227	case SNDRV_OSS_DEVICE_TYPE_DMFM:
	228	return "hardware dependent";
	229	default:
	230	return "?";
	231	}
	232	}
	233
174c1f65 TI	234	static void snd_minor_info_oss_read(struct snd_info_entry *entry,
174c1f65 TI	235	struct snd_info_buffer *buffer)
1da177e4	236	{
6983b724	237	int minor;
174c1f65	238	struct snd_minor *mptr;
1da177e4	239
1a60d4c5	240	mutex_lock(&sound_oss_mutex);
6983b724 CL	241	for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
	242	if (!(mptr = snd_oss_minors[minor]))
	243	continue;
	244	if (mptr->card >= 0)
	245	snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
	246	mptr->card, mptr->device,
	247	snd_oss_device_type_name(mptr->type));
	248	else
	249	snd_iprintf(buffer, "%3i: : %s\n", minor,
	250	snd_oss_device_type_name(mptr->type));
1da177e4	251	}
1a60d4c5	252	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	253	}
1da177e4 LT	254
1da177e4 LT	255
	256	int __init snd_minor_info_oss_init(void)
	257	{
174c1f65	258	struct snd_info_entry *entry;
1da177e4 LT	259
	260	entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
	261	if (entry) {
1da177e4 LT	262	entry->c.text.read = snd_minor_info_oss_read;
	263	if (snd_info_register(entry) < 0) {
	264	snd_info_free_entry(entry);
	265	entry = NULL;
	266	}
	267	}
	268	snd_minor_info_oss_entry = entry;
1da177e4 LT	269	return 0;
	270	}
	271
	272	int __exit snd_minor_info_oss_done(void)
	273	{
746d4a02	274	snd_info_free_entry(snd_minor_info_oss_entry);
1da177e4 LT	275	return 0;
1da177e4 LT	276	}
e28563cc	277	#endif /* CONFIG_PROC_FS */
1da177e4	278
1da177e4	279	#endif /* CONFIG_SND_OSSEMUL */