[GitHub/mt8127/android_kernel_alcatel_ttab.git] / sound / core / sound.c

/*
 *  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>
#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@suse.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 (! current->fs->root)
		return;
	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;

	if (! current->fs->root)
		return;
	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 (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();
	if (unregister_chrdev(major, "alsa") != 0)
		snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
}

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