[mirror_ubuntu-artful-kernel.git] / sound / core / sound_oss.c

/*
 *  Advanced Linux Sound Architecture
 *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <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 <perex@perex.cz>
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;
	57	}
	58
c0d3fb39 TI	59	EXPORT_SYMBOL(snd_lookup_oss_minor_data);
c0d3fb39 TI	60
174c1f65	61	static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	62	{
	63	int minor;
	64
	65	switch (type) {
	66	case SNDRV_OSS_DEVICE_TYPE_MIXER:
7eaa943c TI	67	if (snd_BUG_ON(!card \|\| dev < 0 \|\| dev > 1))
7eaa943c TI	68	return -EINVAL;
1da177e4 LT	69	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
	70	break;
	71	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
	72	minor = SNDRV_MINOR_OSS_SEQUENCER;
	73	break;
	74	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
	75	minor = SNDRV_MINOR_OSS_MUSIC;
	76	break;
	77	case SNDRV_OSS_DEVICE_TYPE_PCM:
7eaa943c TI	78	if (snd_BUG_ON(!card \|\| dev < 0 \|\| dev > 1))
7eaa943c TI	79	return -EINVAL;
1da177e4 LT	80	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
	81	break;
	82	case SNDRV_OSS_DEVICE_TYPE_MIDI:
7eaa943c TI	83	if (snd_BUG_ON(!card \|\| dev < 0 \|\| dev > 1))
7eaa943c TI	84	return -EINVAL;
1da177e4 LT	85	minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
	86	break;
	87	case SNDRV_OSS_DEVICE_TYPE_DMFM:
	88	minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM);
	89	break;
	90	case SNDRV_OSS_DEVICE_TYPE_SNDSTAT:
	91	minor = SNDRV_MINOR_OSS_SNDSTAT;
	92	break;
	93	default:
	94	return -EINVAL;
	95	}
808c569f	96	if (minor < 0 \|\| minor >= SNDRV_OSS_MINORS)
7eaa943c	97	return -EINVAL;
1da177e4 LT	98	return minor;
	99	}
	100
174c1f65	101	int snd_register_oss_device(int type, struct snd_card *card, int dev,
80d7d771	102	const struct file_operations f_ops, void private_data)
1da177e4 LT	103	{
	104	int minor = snd_oss_kernel_minor(type, card, dev);
	105	int minor_unit;
174c1f65	106	struct snd_minor *preg;
1da177e4 LT	107	int cidx = SNDRV_MINOR_OSS_CARD(minor);
	108	int track2 = -1;
	109	int register1 = -1, register2 = -1;
7d2aae1e	110	struct device *carddev = snd_card_get_device_link(card);
1da177e4	111
779ae5a0	112	if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
d001544d	113	return 0; /* ignore silently */
1da177e4 LT	114	if (minor < 0)
1da177e4 LT	115	return minor;
6983b724	116	preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
1da177e4 LT	117	if (preg == NULL)
1da177e4 LT	118	return -ENOMEM;
2af677fc	119	preg->type = type;
6983b724	120	preg->card = card ? card->number : -1;
1da177e4	121	preg->device = dev;
2af677fc	122	preg->f_ops = f_ops;
f87135f5	123	preg->private_data = private_data;
a0830dbd	124	preg->card_ptr = card;
1a60d4c5	125	mutex_lock(&sound_oss_mutex);
6983b724	126	snd_oss_minors[minor] = preg;
1da177e4 LT	127	minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
	128	switch (minor_unit) {
	129	case SNDRV_MINOR_OSS_PCM:
	130	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
	131	break;
	132	case SNDRV_MINOR_OSS_MIDI:
	133	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
	134	break;
	135	case SNDRV_MINOR_OSS_MIDI1:
	136	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
	137	break;
	138	}
2af677fc	139	register1 = register_sound_special_device(f_ops, minor, carddev);
1da177e4 LT	140	if (register1 != minor)
	141	goto __end;
	142	if (track2 >= 0) {
2af677fc CL	143	register2 = register_sound_special_device(f_ops, track2,
2af677fc CL	144	carddev);
1da177e4 LT	145	if (register2 != track2)
1da177e4 LT	146	goto __end;
f87135f5	147	snd_oss_minors[track2] = preg;
1da177e4	148	}
1a60d4c5	149	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	150	return 0;
	151
	152	__end:
	153	if (register2 >= 0)
	154	unregister_sound_special(register2);
	155	if (register1 >= 0)
	156	unregister_sound_special(register1);
6983b724	157	snd_oss_minors[minor] = NULL;
1a60d4c5	158	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	159	kfree(preg);
	160	return -EBUSY;
	161	}
	162
c0d3fb39 TI	163	EXPORT_SYMBOL(snd_register_oss_device);
c0d3fb39 TI	164
174c1f65	165	int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
1da177e4 LT	166	{
	167	int minor = snd_oss_kernel_minor(type, card, dev);
	168	int cidx = SNDRV_MINOR_OSS_CARD(minor);
	169	int track2 = -1;
174c1f65	170	struct snd_minor *mptr;
1da177e4	171
779ae5a0	172	if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
d001544d	173	return 0;
1da177e4 LT	174	if (minor < 0)
1da177e4 LT	175	return minor;
1a60d4c5	176	mutex_lock(&sound_oss_mutex);
6983b724	177	mptr = snd_oss_minors[minor];
1da177e4	178	if (mptr == NULL) {
1a60d4c5	179	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	180	return -ENOENT;
	181	}
	182	unregister_sound_special(minor);
	183	switch (SNDRV_MINOR_OSS_DEVICE(minor)) {
	184	case SNDRV_MINOR_OSS_PCM:
	185	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO);
	186	break;
	187	case SNDRV_MINOR_OSS_MIDI:
	188	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI);
	189	break;
	190	case SNDRV_MINOR_OSS_MIDI1:
	191	track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
	192	break;
	193	}
f87135f5	194	if (track2 >= 0) {
1da177e4	195	unregister_sound_special(track2);
f87135f5 CL	196	snd_oss_minors[track2] = NULL;
f87135f5 CL	197	}
6983b724	198	snd_oss_minors[minor] = NULL;
1a60d4c5	199	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	200	kfree(mptr);
	201	return 0;
	202	}
	203
c0d3fb39 TI	204	EXPORT_SYMBOL(snd_unregister_oss_device);
c0d3fb39 TI	205
1da177e4 LT	206	/*
	207	* INFO PART
	208	*/
	209
cd6a6503	210	#ifdef CONFIG_SND_PROC_FS
2af677fc CL	211	static const char *snd_oss_device_type_name(int type)
	212	{
	213	switch (type) {
	214	case SNDRV_OSS_DEVICE_TYPE_MIXER:
	215	return "mixer";
	216	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
	217	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
	218	return "sequencer";
	219	case SNDRV_OSS_DEVICE_TYPE_PCM:
	220	return "digital audio";
	221	case SNDRV_OSS_DEVICE_TYPE_MIDI:
	222	return "raw midi";
	223	case SNDRV_OSS_DEVICE_TYPE_DMFM:
	224	return "hardware dependent";
	225	default:
	226	return "?";
	227	}
	228	}
	229
174c1f65 TI	230	static void snd_minor_info_oss_read(struct snd_info_entry *entry,
174c1f65 TI	231	struct snd_info_buffer *buffer)
1da177e4	232	{
6983b724	233	int minor;
174c1f65	234	struct snd_minor *mptr;
1da177e4	235
1a60d4c5	236	mutex_lock(&sound_oss_mutex);
6983b724 CL	237	for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
	238	if (!(mptr = snd_oss_minors[minor]))
	239	continue;
	240	if (mptr->card >= 0)
	241	snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
	242	mptr->card, mptr->device,
	243	snd_oss_device_type_name(mptr->type));
	244	else
	245	snd_iprintf(buffer, "%3i: : %s\n", minor,
	246	snd_oss_device_type_name(mptr->type));
1da177e4	247	}
1a60d4c5	248	mutex_unlock(&sound_oss_mutex);
1da177e4 LT	249	}
1da177e4 LT	250
1da177e4 LT	251
	252	int __init snd_minor_info_oss_init(void)
	253	{
174c1f65	254	struct snd_info_entry *entry;
1da177e4 LT	255
1da177e4 LT	256	entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
b591b6e9 TI	257	if (!entry)
	258	return -ENOMEM;
	259	entry->c.text.read = snd_minor_info_oss_read;
	260	return snd_info_register(entry); /* freed in error path */
1da177e4	261	}
cd6a6503	262	#endif /* CONFIG_SND_PROC_FS */