[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
 *
 */

#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);

/* NOTE: This function increments the refcount of the associated card like
 * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
 */
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;
		if (private_data && mreg->card_ptr)
			get_device(&mreg->card_ptr->card_dev);
	} 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)
{
	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;
	preg->card_ptr = card;
	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_SND_PROC_FS
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)
		return -ENOMEM;
	entry->c.text.read = snd_minor_info_oss_read;
	return snd_info_register(entry); /* freed in error path */
}
#endif /* CONFIG_SND_PROC_FS */
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	22	#include <linux/init.h>
d81a6d71	23	#include <linux/export.h>
1da177e4 LT	24	#include <linux/slab.h>
	25	#include <linux/time.h>
	26	#include <sound/core.h>
	27	#include <sound/minors.h>
	28	#include <sound/info.h>
	29	#include <linux/sound.h>
1a60d4c5	30	#include <linux/mutex.h>
1da177e4	31
779ae5a0	32	#define SNDRV_OSS_MINORS 256
1da177e4	33
6983b724	34	static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
1a60d4c5	35	static DEFINE_MUTEX(sound_oss_mutex);
1da177e4	36
a0830dbd TI	37	/* NOTE: This function increments the refcount of the associated card like
	38	* snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
	39	*/
f87135f5 CL	40	void *snd_lookup_oss_minor_data(unsigned int minor, int type)
	41	{
	42	struct snd_minor *mreg;
	43	void *private_data;
	44
3a63e444	45	if (minor >= ARRAY_SIZE(snd_oss_minors))
f87135f5	46	return NULL;
1a60d4c5	47	mutex_lock(&sound_oss_mutex);
f87135f5	48	mreg = snd_oss_minors[minor];
a0830dbd	49	if (mreg && mreg->type == type) {
f87135f5	50	private_data = mreg->private_data;
8bb4d9ce	51	if (private_data && mreg->card_ptr)
f2464064	52	get_device(&mreg->card_ptr->card_dev);
a0830dbd	53	} else
f87135f5	54	private_data = NULL;
1a60d4c5	55	mutex_unlock(&sound_oss_mutex);
f87135f5 CL	56	return private_data;
f87135f5 CL	57	}
c0d3fb39 TI	58	EXPORT_SYMBOL(snd_lookup_oss_minor_data);
c0d3fb39 TI	59
174c1f65	60	static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	61	{
	62	int minor;
	63
	64	switch (type) {
	65	case SNDRV_OSS_DEVICE_TYPE_MIXER:
7eaa943c TI	66	if (snd_BUG_ON(!card \|\| dev < 0 \|\| dev > 1))
7eaa943c TI	67	return -EINVAL;
1da177e4 LT	68	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
	69	break;
	70	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
	71	minor = SNDRV_MINOR_OSS_SEQUENCER;
	72	break;
	73	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
	74	minor = SNDRV_MINOR_OSS_MUSIC;
	75	break;
	76	case SNDRV_OSS_DEVICE_TYPE_PCM:
7eaa943c TI	77	if (snd_BUG_ON(!card \|\| dev < 0 \|\| dev > 1))
7eaa943c TI	78	return -EINVAL;
1da177e4 LT	79	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
	80	break;
	81	case SNDRV_OSS_DEVICE_TYPE_MIDI:
7eaa943c TI	82	if (snd_BUG_ON(!card \|\| dev < 0 \|\| dev > 1))
7eaa943c TI	83	return -EINVAL;
1da177e4 LT	84	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
	85	break;
	86	case SNDRV_OSS_DEVICE_TYPE_DMFM:
	87	minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
	88	break;
	89	case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
	90	minor = SNDRV_MINOR_OSS_SNDSTAT;
	91	break;
	92	default:
	93	return -EINVAL;
	94	}
808c569f	95	if (minor < 0 \|\| minor >= SNDRV_OSS_MINORS)
7eaa943c	96	return -EINVAL;
1da177e4 LT	97	return minor;
	98	}
	99
174c1f65	100	int snd_register_oss_device(int type, struct snd_card *card, int dev,
80d7d771	101	const struct file_operations f_ops, void private_data)
1da177e4 LT	102	{
	103	int minor = snd_oss_kernel_minor(type, card, dev);
	104	int minor_unit;
174c1f65	105	struct snd_minor *preg;
1da177e4 LT	106	int cidx = SNDRV_MINOR_OSS_CARD(minor);
	107	int track2 = -1;
	108	int register1 = -1, register2 = -1;
7d2aae1e	109	struct device *carddev = snd_card_get_device_link(card);
1da177e4	110
779ae5a0	111	if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
d001544d	112	return 0; /* ignore silently */
1da177e4 LT	113	if (minor < 0)
1da177e4 LT	114	return minor;
6983b724	115	preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
1da177e4 LT	116	if (preg == NULL)
1da177e4 LT	117	return -ENOMEM;
2af677fc	118	preg->type = type;
6983b724	119	preg->card = card ? card->number : -1;
1da177e4	120	preg->device = dev;
2af677fc	121	preg->f_ops = f_ops;
f87135f5	122	preg->private_data = private_data;
a0830dbd	123	preg->card_ptr = card;
1a60d4c5	124	mutex_lock(&sound_oss_mutex);
6983b724	125	snd_oss_minors[minor] = preg;
1da177e4 LT	126	minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
	127	switch (minor_unit) {
	128	case SNDRV_MINOR_OSS_PCM:
	129	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
	130	break;
	131	case SNDRV_MINOR_OSS_MIDI:
	132	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
	133	break;
	134	case SNDRV_MINOR_OSS_MIDI1:
	135	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
	136	break;
	137	}
2af677fc	138	register1 = register_sound_special_device(f_ops, minor, carddev);
1da177e4 LT	139	if (register1 != minor)
	140	goto __end;
	141	if (track2 >= 0) {
2af677fc CL	142	register2 = register_sound_special_device(f_ops, track2,
2af677fc CL	143	carddev);
1da177e4 LT	144	if (register2 != track2)
1da177e4 LT	145	goto __end;
f87135f5	146	snd_oss_minors[track2] = preg;
1da177e4	147	}
1a60d4c5	148	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	149	return 0;
	150
	151	__end:
	152	if (register2 >= 0)
	153	unregister_sound_special(register2);
	154	if (register1 >= 0)
	155	unregister_sound_special(register1);
6983b724	156	snd_oss_minors[minor] = NULL;
1a60d4c5	157	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	158	kfree(preg);
	159	return -EBUSY;
	160	}
c0d3fb39 TI	161	EXPORT_SYMBOL(snd_register_oss_device);
c0d3fb39 TI	162
174c1f65	163	int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
1da177e4 LT	164	{
	165	int minor = snd_oss_kernel_minor(type, card, dev);
	166	int cidx = SNDRV_MINOR_OSS_CARD(minor);
	167	int track2 = -1;
174c1f65	168	struct snd_minor *mptr;
1da177e4	169
779ae5a0	170	if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
d001544d	171	return 0;
1da177e4 LT	172	if (minor < 0)
1da177e4 LT	173	return minor;
1a60d4c5	174	mutex_lock(&sound_oss_mutex);
6983b724	175	mptr = snd_oss_minors[minor];
1da177e4	176	if (mptr == NULL) {
1a60d4c5	177	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	178	return -ENOENT;
	179	}
	180	unregister_sound_special(minor);
	181	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
	182	case SNDRV_MINOR_OSS_PCM:
	183	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
	184	break;
	185	case SNDRV_MINOR_OSS_MIDI:
	186	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
	187	break;
	188	case SNDRV_MINOR_OSS_MIDI1:
	189	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
	190	break;
	191	}
f87135f5	192	if (track2 >= 0) {
1da177e4	193	unregister_sound_special(track2);
f87135f5 CL	194	snd_oss_minors[track2] = NULL;
f87135f5 CL	195	}
6983b724	196	snd_oss_minors[minor] = NULL;
1a60d4c5	197	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	198	kfree(mptr);
	199	return 0;
	200	}
c0d3fb39 TI	201	EXPORT_SYMBOL(snd_unregister_oss_device);
c0d3fb39 TI	202
1da177e4 LT	203	/*
	204	* INFO PART
	205	*/
	206
cd6a6503	207	#ifdef CONFIG_SND_PROC_FS
2af677fc CL	208	static const char *snd_oss_device_type_name(int type)
	209	{
	210	switch (type) {
	211	case SNDRV_OSS_DEVICE_TYPE_MIXER:
	212	return "mixer";
	213	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
	214	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
	215	return "sequencer";
	216	case SNDRV_OSS_DEVICE_TYPE_PCM:
	217	return "digital audio";
	218	case SNDRV_OSS_DEVICE_TYPE_MIDI:
	219	return "raw midi";
	220	case SNDRV_OSS_DEVICE_TYPE_DMFM:
	221	return "hardware dependent";
	222	default:
	223	return "?";
	224	}
	225	}
	226
174c1f65 TI	227	static void snd_minor_info_oss_read(struct snd_info_entry *entry,
174c1f65 TI	228	struct snd_info_buffer *buffer)
1da177e4	229	{
6983b724	230	int minor;
174c1f65	231	struct snd_minor *mptr;
1da177e4	232
1a60d4c5	233	mutex_lock(&sound_oss_mutex);
6983b724 CL	234	for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
	235	if (!(mptr = snd_oss_minors[minor]))
	236	continue;
	237	if (mptr->card >= 0)
	238	snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
	239	mptr->card, mptr->device,
	240	snd_oss_device_type_name(mptr->type));
	241	else
	242	snd_iprintf(buffer, "%3i: : %s\n", minor,
	243	snd_oss_device_type_name(mptr->type));
1da177e4	244	}
1a60d4c5	245	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	246	}
1da177e4 LT	247
1da177e4 LT	248
	249	int __init snd_minor_info_oss_init(void)
	250	{
174c1f65	251	struct snd_info_entry *entry;
1da177e4 LT	252
1da177e4 LT	253	entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
b591b6e9 TI	254	if (!entry)
	255	return -ENOMEM;
	256	entry->c.text.read = snd_minor_info_oss_read;
	257	return snd_info_register(entry); /* freed in error path */
1da177e4	258	}
cd6a6503	259	#endif /* CONFIG_SND_PROC_FS */