[deliverable/linux.git] / sound / core / sound.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/slab.h>
#include <linux/time.h>
#include <linux/device.h>
#include <linux/moduleparam.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/info.h>
#include <sound/version.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <linux/kmod.h>
#include <linux/mutex.h>

#define SNDRV_OS_MINORS 256

static int major = CONFIG_SND_MAJOR;
int snd_major;
EXPORT_SYMBOL(snd_major);

static int cards_limit = 1;

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
MODULE_LICENSE("GPL");
module_param(major, int, 0444);
MODULE_PARM_DESC(major, "Major # for sound driver.");
module_param(cards_limit, int, 0444);
MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);

/* this one holds the actual max. card number currently available.
 * as default, it's identical with cards_limit option.  when more
 * modules are loaded manually, this limit number increases, too.
 */
int snd_ecards_limit;
EXPORT_SYMBOL(snd_ecards_limit);

static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
static DEFINE_MUTEX(sound_mutex);

#ifdef CONFIG_KMOD

/**
 * snd_request_card - try to load the card module
 * @card: the card number
 *
 * Tries to load the module "snd-card-X" for the given card number
 * via KMOD.  Returns immediately if already loaded.
 */
void snd_request_card(int card)
{
	if (snd_card_locked(card))
		return;
	if (card < 0 || card >= cards_limit)
		return;
	request_module("snd-card-%i", card);
}

EXPORT_SYMBOL(snd_request_card);

static void snd_request_other(int minor)
{
	char *str;

	switch (minor) {
	case SNDRV_MINOR_SEQUENCER:	str = "snd-seq";	break;
	case SNDRV_MINOR_TIMER:		str = "snd-timer";	break;
	default:			return;
	}
	request_module(str);
}

#endif				/* request_module support */

/**
 * snd_lookup_minor_data - get user data of a registered device
 * @minor: the minor number
 * @type: device type (SNDRV_DEVICE_TYPE_XXX)
 *
 * Checks that a minor device with the specified type is registered, and returns
 * its user data pointer.
 */
void *snd_lookup_minor_data(unsigned int minor, int type)
{
	struct snd_minor *mreg;
	void *private_data;

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

EXPORT_SYMBOL(snd_lookup_minor_data);

static int snd_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct snd_minor *mptr = NULL;
	const struct file_operations *old_fops;
	int err = 0;

	if (minor >= ARRAY_SIZE(snd_minors))
		return -ENODEV;
	mptr = snd_minors[minor];
	if (mptr == NULL) {
#ifdef CONFIG_KMOD
		int dev = SNDRV_MINOR_DEVICE(minor);
		if (dev == SNDRV_MINOR_CONTROL) {
			/* /dev/aloadC? */
			int card = SNDRV_MINOR_CARD(minor);
			if (snd_cards[card] == NULL)
				snd_request_card(card);
		} else if (dev == SNDRV_MINOR_GLOBAL) {
			/* /dev/aloadSEQ */
			snd_request_other(minor);
		}
#ifndef CONFIG_SND_DYNAMIC_MINORS
		/* /dev/snd/{controlC?,seq} */
		mptr = snd_minors[minor];
		if (mptr == NULL)
#endif
#endif
			return -ENODEV;
	}
	old_fops = file->f_op;
	file->f_op = fops_get(mptr->f_ops);
	if (file->f_op->open)
		err = file->f_op->open(inode, file);
	if (err) {
		fops_put(file->f_op);
		file->f_op = fops_get(old_fops);
	}
	fops_put(old_fops);
	return err;
}

static const struct file_operations snd_fops =
{
	.owner =	THIS_MODULE,
	.open =		snd_open
};

#ifdef CONFIG_SND_DYNAMIC_MINORS
static int snd_find_free_minor(void)
{
	int minor;

	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
		/* skip minors still used statically for autoloading devices */
		if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL ||
		    minor == SNDRV_MINOR_SEQUENCER)
			continue;
		if (!snd_minors[minor])
			return minor;
	}
	return -EBUSY;
}
#else
static int snd_kernel_minor(int type, struct snd_card *card, int dev)
{
	int minor;

	switch (type) {
	case SNDRV_DEVICE_TYPE_SEQUENCER:
	case SNDRV_DEVICE_TYPE_TIMER:
		minor = type;
		break;
	case SNDRV_DEVICE_TYPE_CONTROL:
		snd_assert(card != NULL, return -EINVAL);
		minor = SNDRV_MINOR(card->number, type);
		break;
	case SNDRV_DEVICE_TYPE_HWDEP:
	case SNDRV_DEVICE_TYPE_RAWMIDI:
	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
		snd_assert(card != NULL, return -EINVAL);
		minor = SNDRV_MINOR(card->number, type + dev);
		break;
	default:
		return -EINVAL;
	}
	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	return minor;
}
#endif

/**
 * snd_register_device_for_dev - Register the ALSA device file for the card
 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
 * @card: the card instance
 * @dev: the device index
 * @f_ops: the file operations
 * @private_data: user pointer for f_ops->open()
 * @name: the device file name
 * @device: the &struct device to link this new device to
 *
 * Registers an ALSA device file for the given card.
 * The operators have to be set in reg parameter.
 *
 * Returns zero if successful, or a negative error code on failure.
 */
int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
				const struct file_operations *f_ops,
				void *private_data,
				const char *name, struct device *device)
{
	int minor;
	struct snd_minor *preg;

	snd_assert(name, return -EINVAL);
	preg = kmalloc(sizeof *preg, 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_mutex);
#ifdef CONFIG_SND_DYNAMIC_MINORS
	minor = snd_find_free_minor();
#else
	minor = snd_kernel_minor(type, card, dev);
	if (minor >= 0 && snd_minors[minor])
		minor = -EBUSY;
#endif
	if (minor < 0) {
		mutex_unlock(&sound_mutex);
		kfree(preg);
		return minor;
	}
	snd_minors[minor] = preg;
	preg->dev = device_create(sound_class, device, MKDEV(major, minor),
				  "%s", name);
	if (IS_ERR(preg->dev)) {
		snd_minors[minor] = NULL;
		mutex_unlock(&sound_mutex);
		minor = PTR_ERR(preg->dev);
		kfree(preg);
		return minor;
	}

	if (preg->dev)
		dev_set_drvdata(preg->dev, private_data);

	mutex_unlock(&sound_mutex);
	return 0;
}

EXPORT_SYMBOL(snd_register_device_for_dev);

/* find the matching minor record
 * return the index of snd_minor, or -1 if not found
 */
static int find_snd_minor(int type, struct snd_card *card, int dev)
{
	int cardnum, minor;
	struct snd_minor *mptr;

	cardnum = card ? card->number : -1;
	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
		if ((mptr = snd_minors[minor]) != NULL &&
		    mptr->type == type &&
		    mptr->card == cardnum &&
		    mptr->device == dev)
			return minor;
	return -1;
}

/**
 * snd_unregister_device - unregister the device on the given card
 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
 * @card: the card instance
 * @dev: the device index
 *
 * Unregisters the device file already registered via
 * snd_register_device().
 *
 * Returns zero if sucecessful, or a negative error code on failure
 */
int snd_unregister_device(int type, struct snd_card *card, int dev)
{
	int minor;

	mutex_lock(&sound_mutex);
	minor = find_snd_minor(type, card, dev);
	if (minor < 0) {
		mutex_unlock(&sound_mutex);
		return -EINVAL;
	}

	device_destroy(sound_class, MKDEV(major, minor));

	kfree(snd_minors[minor]);
	snd_minors[minor] = NULL;
	mutex_unlock(&sound_mutex);
	return 0;
}

EXPORT_SYMBOL(snd_unregister_device);

int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
			      struct device_attribute *attr)
{
	int minor, ret = -EINVAL;
	struct device *d;

	mutex_lock(&sound_mutex);
	minor = find_snd_minor(type, card, dev);
	if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL)
		ret = device_create_file(d, attr);
	mutex_unlock(&sound_mutex);
	return ret;

}

EXPORT_SYMBOL(snd_add_device_sysfs_file);

#ifdef CONFIG_PROC_FS
/*
 *  INFO PART
 */

static struct snd_info_entry *snd_minor_info_entry;

static const char *snd_device_type_name(int type)
{
	switch (type) {
	case SNDRV_DEVICE_TYPE_CONTROL:
		return "control";
	case SNDRV_DEVICE_TYPE_HWDEP:
		return "hardware dependent";
	case SNDRV_DEVICE_TYPE_RAWMIDI:
		return "raw midi";
	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
		return "digital audio playback";
	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
		return "digital audio capture";
	case SNDRV_DEVICE_TYPE_SEQUENCER:
		return "sequencer";
	case SNDRV_DEVICE_TYPE_TIMER:
		return "timer";
	default:
		return "?";
	}
}

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

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

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

	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	if (entry) {
		entry->c.text.read = snd_minor_info_read;
		if (snd_info_register(entry) < 0) {
			snd_info_free_entry(entry);
			entry = NULL;
		}
	}
	snd_minor_info_entry = entry;
	return 0;
}

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

/*
 *  INIT PART
 */

static int __init alsa_sound_init(void)
{
	snd_major = major;
	snd_ecards_limit = cards_limit;
	if (register_chrdev(major, "alsa", &snd_fops)) {
		snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
		return -EIO;
	}
	if (snd_info_init() < 0) {
		unregister_chrdev(major, "alsa");
		return -ENOMEM;
	}
	snd_info_minor_register();
#ifndef MODULE
	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
#endif
	return 0;
}

static void __exit alsa_sound_exit(void)
{
	snd_info_minor_unregister();
	snd_info_done();
	unregister_chrdev(major, "alsa");
}

module_init(alsa_sound_init)
module_exit(alsa_sound_exit)
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 LT	22	#include <linux/init.h>
	23	#include <linux/slab.h>
	24	#include <linux/time.h>
9a1a2a1d	25	#include <linux/device.h>
1da177e4 LT	26	#include <linux/moduleparam.h>
	27	#include <sound/core.h>
	28	#include <sound/minors.h>
	29	#include <sound/info.h>
	30	#include <sound/version.h>
	31	#include <sound/control.h>
	32	#include <sound/initval.h>
	33	#include <linux/kmod.h>
1a60d4c5	34	#include <linux/mutex.h>
1da177e4 LT	35
	36	#define SNDRV_OS_MINORS 256
	37
	38	static int major = CONFIG_SND_MAJOR;
	39	int snd_major;
c0d3fb39 TI	40	EXPORT_SYMBOL(snd_major);
c0d3fb39 TI	41
1da177e4	42	static int cards_limit = 1;
1da177e4	43
c1017a4c	44	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	45	MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
	46	MODULE_LICENSE("GPL");
	47	module_param(major, int, 0444);
	48	MODULE_PARM_DESC(major, "Major # for sound driver.");
	49	module_param(cards_limit, int, 0444);
	50	MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
1da177e4 LT	51	MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
	52
	53	/* this one holds the actual max. card number currently available.
	54	* as default, it's identical with cards_limit option. when more
	55	* modules are loaded manually, this limit number increases, too.
	56	*/
	57	int snd_ecards_limit;
c0d3fb39	58	EXPORT_SYMBOL(snd_ecards_limit);
1da177e4	59
6983b724	60	static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
1a60d4c5	61	static DEFINE_MUTEX(sound_mutex);
1da177e4	62
1da177e4 LT	63	#ifdef CONFIG_KMOD
	64
	65	/**
	66	* snd_request_card - try to load the card module
	67	* @card: the card number
	68	*
	69	* Tries to load the module "snd-card-X" for the given card number
	70	* via KMOD. Returns immediately if already loaded.
	71	*/
	72	void snd_request_card(int card)
	73	{
746df948	74	if (snd_card_locked(card))
1da177e4 LT	75	return;
	76	if (card < 0 \|\| card >= cards_limit)
	77	return;
	78	request_module("snd-card-%i", card);
	79	}
	80
c0d3fb39 TI	81	EXPORT_SYMBOL(snd_request_card);
c0d3fb39 TI	82
1da177e4 LT	83	static void snd_request_other(int minor)
	84	{
	85	char *str;
	86
1da177e4 LT	87	switch (minor) {
	88	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	89	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	90	default: return;
	91	}
	92	request_module(str);
	93	}
	94
	95	#endif /* request_module support */
	96
f87135f5 CL	97	/**
	98	* snd_lookup_minor_data - get user data of a registered device
	99	* @minor: the minor number
	100	* @type: device type (SNDRV_DEVICE_TYPE_XXX)
	101	*
	102	* Checks that a minor device with the specified type is registered, and returns
	103	* its user data pointer.
	104	*/
	105	void *snd_lookup_minor_data(unsigned int minor, int type)
	106	{
	107	struct snd_minor *mreg;
	108	void *private_data;
	109
3a63e444	110	if (minor >= ARRAY_SIZE(snd_minors))
f87135f5	111	return NULL;
1a60d4c5	112	mutex_lock(&sound_mutex);
f87135f5 CL	113	mreg = snd_minors[minor];
	114	if (mreg && mreg->type == type)
	115	private_data = mreg->private_data;
	116	else
	117	private_data = NULL;
1a60d4c5	118	mutex_unlock(&sound_mutex);
f87135f5 CL	119	return private_data;
	120	}
	121
c0d3fb39 TI	122	EXPORT_SYMBOL(snd_lookup_minor_data);
c0d3fb39 TI	123
1da177e4 LT	124	static int snd_open(struct inode inode, struct file file)
1da177e4 LT	125	{
332682b1	126	unsigned int minor = iminor(inode);
512bbd6a	127	struct snd_minor *mptr = NULL;
99ac48f5	128	const struct file_operations *old_fops;
1da177e4 LT	129	int err = 0;
1da177e4 LT	130
3a63e444	131	if (minor >= ARRAY_SIZE(snd_minors))
332682b1 CL	132	return -ENODEV;
	133	mptr = snd_minors[minor];
	134	if (mptr == NULL) {
1da177e4	135	#ifdef CONFIG_KMOD
332682b1 CL	136	int dev = SNDRV_MINOR_DEVICE(minor);
	137	if (dev == SNDRV_MINOR_CONTROL) {
	138	/* /dev/aloadC? */
	139	int card = SNDRV_MINOR_CARD(minor);
1da177e4	140	if (snd_cards[card] == NULL)
332682b1 CL	141	snd_request_card(card);
	142	} else if (dev == SNDRV_MINOR_GLOBAL) {
	143	/* /dev/aloadSEQ */
1da177e4	144	snd_request_other(minor);
332682b1 CL	145	}
	146	#ifndef CONFIG_SND_DYNAMIC_MINORS
	147	/* /dev/snd/{controlC?,seq} */
	148	mptr = snd_minors[minor];
	149	if (mptr == NULL)
	150	#endif
1da177e4	151	#endif
332682b1	152	return -ENODEV;
1da177e4	153	}
1da177e4 LT	154	old_fops = file->f_op;
	155	file->f_op = fops_get(mptr->f_ops);
	156	if (file->f_op->open)
	157	err = file->f_op->open(inode, file);
	158	if (err) {
	159	fops_put(file->f_op);
	160	file->f_op = fops_get(old_fops);
	161	}
	162	fops_put(old_fops);
	163	return err;
	164	}
	165
9c2e08c5	166	static const struct file_operations snd_fops =
1da177e4 LT	167	{
	168	.owner = THIS_MODULE,
	169	.open = snd_open
	170	};
	171
332682b1 CL	172	#ifdef CONFIG_SND_DYNAMIC_MINORS
	173	static int snd_find_free_minor(void)
	174	{
	175	int minor;
	176
	177	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
	178	/* skip minors still used statically for autoloading devices */
	179	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL \|\|
	180	minor == SNDRV_MINOR_SEQUENCER)
	181	continue;
	182	if (!snd_minors[minor])
	183	return minor;
	184	}
	185	return -EBUSY;
	186	}
	187	#else
512bbd6a	188	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	189	{
	190	int minor;
	191
	192	switch (type) {
	193	case SNDRV_DEVICE_TYPE_SEQUENCER:
	194	case SNDRV_DEVICE_TYPE_TIMER:
	195	minor = type;
	196	break;
	197	case SNDRV_DEVICE_TYPE_CONTROL:
	198	snd_assert(card != NULL, return -EINVAL);
	199	minor = SNDRV_MINOR(card->number, type);
	200	break;
	201	case SNDRV_DEVICE_TYPE_HWDEP:
	202	case SNDRV_DEVICE_TYPE_RAWMIDI:
	203	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	204	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	205	snd_assert(card != NULL, return -EINVAL);
	206	minor = SNDRV_MINOR(card->number, type + dev);
	207	break;
	208	default:
	209	return -EINVAL;
	210	}
	211	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	212	return minor;
	213	}
332682b1	214	#endif
1da177e4 LT	215
1da177e4 LT	216	/**
12b131c4	217	* snd_register_device_for_dev - Register the ALSA device file for the card
1da177e4 LT	218	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	219	* @card: the card instance
	220	* @dev: the device index
2af677fc	221	* @f_ops: the file operations
f87135f5	222	* @private_data: user pointer for f_ops->open()
1da177e4	223	* @name: the device file name
12b131c4	224	* @device: the &struct device to link this new device to
1da177e4 LT	225	*
	226	* Registers an ALSA device file for the given card.
	227	* The operators have to be set in reg parameter.
	228	*
12b131c4	229	* Returns zero if successful, or a negative error code on failure.
1da177e4	230	*/
12b131c4 JB	231	int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
	232	const struct file_operations *f_ops,
	233	void *private_data,
	234	const char name, struct device device)
1da177e4	235	{
332682b1	236	int minor;
512bbd6a	237	struct snd_minor *preg;
1da177e4	238
1da177e4	239	snd_assert(name, return -EINVAL);
562b590d	240	preg = kmalloc(sizeof *preg, GFP_KERNEL);
1da177e4 LT	241	if (preg == NULL)
1da177e4 LT	242	return -ENOMEM;
2af677fc	243	preg->type = type;
6983b724	244	preg->card = card ? card->number : -1;
1da177e4	245	preg->device = dev;
2af677fc	246	preg->f_ops = f_ops;
f87135f5	247	preg->private_data = private_data;
1a60d4c5	248	mutex_lock(&sound_mutex);
332682b1 CL	249	#ifdef CONFIG_SND_DYNAMIC_MINORS
	250	minor = snd_find_free_minor();
	251	#else
	252	minor = snd_kernel_minor(type, card, dev);
	253	if (minor >= 0 && snd_minors[minor])
	254	minor = -EBUSY;
	255	#endif
	256	if (minor < 0) {
1a60d4c5	257	mutex_unlock(&sound_mutex);
1da177e4	258	kfree(preg);
332682b1	259	return minor;
1da177e4	260	}
6983b724	261	snd_minors[minor] = preg;
d80f19fa GKH	262	preg->dev = device_create(sound_class, device, MKDEV(major, minor),
d80f19fa GKH	263	"%s", name);
2469049e MK	264	if (IS_ERR(preg->dev)) {
	265	snd_minors[minor] = NULL;
	266	mutex_unlock(&sound_mutex);
	267	minor = PTR_ERR(preg->dev);
	268	kfree(preg);
	269	return minor;
	270	}
	271
d80f19fa GKH	272	if (preg->dev)
d80f19fa GKH	273	dev_set_drvdata(preg->dev, private_data);
1da177e4	274
1a60d4c5	275	mutex_unlock(&sound_mutex);
1da177e4 LT	276	return 0;
	277	}
	278
12b131c4	279	EXPORT_SYMBOL(snd_register_device_for_dev);
c0d3fb39	280
9d19f48c TI	281	/* find the matching minor record
	282	* return the index of snd_minor, or -1 if not found
	283	*/
	284	static int find_snd_minor(int type, struct snd_card *card, int dev)
	285	{
	286	int cardnum, minor;
	287	struct snd_minor *mptr;
	288
	289	cardnum = card ? card->number : -1;
	290	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
	291	if ((mptr = snd_minors[minor]) != NULL &&
	292	mptr->type == type &&
	293	mptr->card == cardnum &&
	294	mptr->device == dev)
	295	return minor;
	296	return -1;
	297	}
	298
1da177e4 LT	299	/**
	300	* snd_unregister_device - unregister the device on the given card
	301	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	302	* @card: the card instance
	303	* @dev: the device index
	304	*
	305	* Unregisters the device file already registered via
	306	* snd_register_device().
	307	*
	308	* Returns zero if sucecessful, or a negative error code on failure
	309	*/
512bbd6a	310	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4	311	{
9d19f48c	312	int minor;
1da177e4	313
1a60d4c5	314	mutex_lock(&sound_mutex);
9d19f48c TI	315	minor = find_snd_minor(type, card, dev);
9d19f48c TI	316	if (minor < 0) {
1a60d4c5	317	mutex_unlock(&sound_mutex);
1da177e4 LT	318	return -EINVAL;
	319	}
	320
d80f19fa	321	device_destroy(sound_class, MKDEV(major, minor));
1da177e4	322
9d19f48c	323	kfree(snd_minors[minor]);
6983b724	324	snd_minors[minor] = NULL;
1a60d4c5	325	mutex_unlock(&sound_mutex);
1da177e4 LT	326	return 0;
	327	}
	328
c0d3fb39 TI	329	EXPORT_SYMBOL(snd_unregister_device);
c0d3fb39 TI	330
9d19f48c	331	int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
d80f19fa	332	struct device_attribute *attr)
9d19f48c TI	333	{
9d19f48c TI	334	int minor, ret = -EINVAL;
d80f19fa	335	struct device *d;
9d19f48c TI	336
	337	mutex_lock(&sound_mutex);
	338	minor = find_snd_minor(type, card, dev);
d80f19fa GKH	339	if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL)
d80f19fa GKH	340	ret = device_create_file(d, attr);
9d19f48c TI	341	mutex_unlock(&sound_mutex);
	342	return ret;
	343
	344	}
	345
	346	EXPORT_SYMBOL(snd_add_device_sysfs_file);
	347
e28563cc	348	#ifdef CONFIG_PROC_FS
1da177e4 LT	349	/*
	350	* INFO PART
	351	*/
	352
6581f4e7	353	static struct snd_info_entry *snd_minor_info_entry;
1da177e4	354
2af677fc CL	355	static const char *snd_device_type_name(int type)
	356	{
	357	switch (type) {
	358	case SNDRV_DEVICE_TYPE_CONTROL:
	359	return "control";
	360	case SNDRV_DEVICE_TYPE_HWDEP:
	361	return "hardware dependent";
	362	case SNDRV_DEVICE_TYPE_RAWMIDI:
	363	return "raw midi";
	364	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	365	return "digital audio playback";
	366	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	367	return "digital audio capture";
	368	case SNDRV_DEVICE_TYPE_SEQUENCER:
	369	return "sequencer";
	370	case SNDRV_DEVICE_TYPE_TIMER:
	371	return "timer";
	372	default:
	373	return "?";
	374	}
	375	}
	376
512bbd6a	377	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	378	{
6983b724	379	int minor;
512bbd6a	380	struct snd_minor *mptr;
1da177e4	381
1a60d4c5	382	mutex_lock(&sound_mutex);
6983b724 CL	383	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	384	if (!(mptr = snd_minors[minor]))
	385	continue;
	386	if (mptr->card >= 0) {
	387	if (mptr->device >= 0)
d001544d	388	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	389	minor, mptr->card, mptr->device,
	390	snd_device_type_name(mptr->type));
	391	else
d001544d	392	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	393	minor, mptr->card,
	394	snd_device_type_name(mptr->type));
	395	} else
d001544d	396	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	397	snd_device_type_name(mptr->type));
1da177e4	398	}
1a60d4c5	399	mutex_unlock(&sound_mutex);
1da177e4 LT	400	}
	401
	402	int __init snd_minor_info_init(void)
	403	{
512bbd6a	404	struct snd_info_entry *entry;
1da177e4 LT	405
	406	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	407	if (entry) {
1da177e4 LT	408	entry->c.text.read = snd_minor_info_read;
	409	if (snd_info_register(entry) < 0) {
	410	snd_info_free_entry(entry);
	411	entry = NULL;
	412	}
	413	}
	414	snd_minor_info_entry = entry;
	415	return 0;
	416	}
	417
	418	int __exit snd_minor_info_done(void)
	419	{
746d4a02	420	snd_info_free_entry(snd_minor_info_entry);
1da177e4 LT	421	return 0;
1da177e4 LT	422	}
e28563cc	423	#endif /* CONFIG_PROC_FS */
1da177e4 LT	424
	425	/*
	426	* INIT PART
	427	*/
	428
	429	static int __init alsa_sound_init(void)
	430	{
1da177e4 LT	431	snd_major = major;
1da177e4 LT	432	snd_ecards_limit = cards_limit;
1da177e4 LT	433	if (register_chrdev(major, "alsa", &snd_fops)) {
1da177e4 LT	434	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
1da177e4 LT	435	return -EIO;
1da177e4 LT	436	}
1da177e4	437	if (snd_info_init() < 0) {
1da177e4	438	unregister_chrdev(major, "alsa");
1da177e4 LT	439	return -ENOMEM;
	440	}
	441	snd_info_minor_register();
1da177e4 LT	442	#ifndef MODULE
	443	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
	444	#endif
	445	return 0;
	446	}
	447
	448	static void __exit alsa_sound_exit(void)
	449	{
1da177e4 LT	450	snd_info_minor_unregister();
1da177e4 LT	451	snd_info_done();
68fc4fab	452	unregister_chrdev(major, "alsa");
1da177e4 LT	453	}
	454
	455	module_init(alsa_sound_init)
	456	module_exit(alsa_sound_exit)