[mirror_ubuntu-artful-kernel.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);

extern struct class *sound_class;


#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 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 - 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
 *
 * Registers an ALSA device file for the given card.
 * The operators have to be set in reg parameter.
 *
 * Retrurns zero if successful, or a negative error code on failure.
 */
int snd_register_device(int type, struct snd_card *card, int dev,
			const struct file_operations *f_ops, void *private_data,
			const char *name)
{
	int minor;
	struct snd_minor *preg;
	struct device *device = NULL;

	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;
	if (card)
		device = card->dev;
	preg->class_dev = class_device_create(sound_class, NULL,
					      MKDEV(major, minor),
					      device, "%s", name);
	if (preg->class_dev)
		class_set_devdata(preg->class_dev, private_data);

	mutex_unlock(&sound_mutex);
	return 0;
}

EXPORT_SYMBOL(snd_register_device);

/* 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;
	}

	class_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,
			      const struct class_device_attribute *attr)
{
	int minor, ret = -EINVAL;
	struct class_device *cdev;

	mutex_lock(&sound_mutex);
	minor = find_snd_minor(type, card, dev);
	if (minor >= 0 && (cdev = snd_minors[minor]->class_dev) != NULL)
		ret = class_device_create_file(cdev, 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
619e666b	64	extern struct class *sound_class;
1da177e4 LT	65
	66
	67	#ifdef CONFIG_KMOD
	68
	69	/**
	70	* snd_request_card - try to load the card module
	71	* @card: the card number
	72	*
	73	* Tries to load the module "snd-card-X" for the given card number
	74	* via KMOD. Returns immediately if already loaded.
	75	*/
	76	void snd_request_card(int card)
	77	{
1da177e4 LT	78	if (! current->fs->root)
1da177e4 LT	79	return;
746df948	80	if (snd_card_locked(card))
1da177e4 LT	81	return;
	82	if (card < 0 \|\| card >= cards_limit)
	83	return;
	84	request_module("snd-card-%i", card);
	85	}
	86
c0d3fb39 TI	87	EXPORT_SYMBOL(snd_request_card);
c0d3fb39 TI	88
1da177e4 LT	89	static void snd_request_other(int minor)
	90	{
	91	char *str;
	92
	93	if (! current->fs->root)
	94	return;
	95	switch (minor) {
	96	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	97	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	98	default: return;
	99	}
	100	request_module(str);
	101	}
	102
	103	#endif /* request_module support */
	104
f87135f5 CL	105	/**
	106	* snd_lookup_minor_data - get user data of a registered device
	107	* @minor: the minor number
	108	* @type: device type (SNDRV_DEVICE_TYPE_XXX)
	109	*
	110	* Checks that a minor device with the specified type is registered, and returns
	111	* its user data pointer.
	112	*/
	113	void *snd_lookup_minor_data(unsigned int minor, int type)
	114	{
	115	struct snd_minor *mreg;
	116	void *private_data;
	117
3a63e444	118	if (minor >= ARRAY_SIZE(snd_minors))
f87135f5	119	return NULL;
1a60d4c5	120	mutex_lock(&sound_mutex);
f87135f5 CL	121	mreg = snd_minors[minor];
	122	if (mreg && mreg->type == type)
	123	private_data = mreg->private_data;
	124	else
	125	private_data = NULL;
1a60d4c5	126	mutex_unlock(&sound_mutex);
f87135f5 CL	127	return private_data;
	128	}
	129
c0d3fb39 TI	130	EXPORT_SYMBOL(snd_lookup_minor_data);
c0d3fb39 TI	131
1da177e4 LT	132	static int snd_open(struct inode inode, struct file file)
1da177e4 LT	133	{
332682b1	134	unsigned int minor = iminor(inode);
512bbd6a	135	struct snd_minor *mptr = NULL;
99ac48f5	136	const struct file_operations *old_fops;
1da177e4 LT	137	int err = 0;
1da177e4 LT	138
3a63e444	139	if (minor >= ARRAY_SIZE(snd_minors))
332682b1 CL	140	return -ENODEV;
	141	mptr = snd_minors[minor];
	142	if (mptr == NULL) {
1da177e4	143	#ifdef CONFIG_KMOD
332682b1 CL	144	int dev = SNDRV_MINOR_DEVICE(minor);
	145	if (dev == SNDRV_MINOR_CONTROL) {
	146	/* /dev/aloadC? */
	147	int card = SNDRV_MINOR_CARD(minor);
1da177e4	148	if (snd_cards[card] == NULL)
332682b1 CL	149	snd_request_card(card);
	150	} else if (dev == SNDRV_MINOR_GLOBAL) {
	151	/* /dev/aloadSEQ */
1da177e4	152	snd_request_other(minor);
332682b1 CL	153	}
	154	#ifndef CONFIG_SND_DYNAMIC_MINORS
	155	/* /dev/snd/{controlC?,seq} */
	156	mptr = snd_minors[minor];
	157	if (mptr == NULL)
	158	#endif
1da177e4	159	#endif
332682b1	160	return -ENODEV;
1da177e4	161	}
1da177e4 LT	162	old_fops = file->f_op;
	163	file->f_op = fops_get(mptr->f_ops);
	164	if (file->f_op->open)
	165	err = file->f_op->open(inode, file);
	166	if (err) {
	167	fops_put(file->f_op);
	168	file->f_op = fops_get(old_fops);
	169	}
	170	fops_put(old_fops);
	171	return err;
	172	}
	173
	174	static struct file_operations snd_fops =
	175	{
	176	.owner = THIS_MODULE,
	177	.open = snd_open
	178	};
	179
332682b1 CL	180	#ifdef CONFIG_SND_DYNAMIC_MINORS
	181	static int snd_find_free_minor(void)
	182	{
	183	int minor;
	184
	185	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
	186	/* skip minors still used statically for autoloading devices */
	187	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL \|\|
	188	minor == SNDRV_MINOR_SEQUENCER)
	189	continue;
	190	if (!snd_minors[minor])
	191	return minor;
	192	}
	193	return -EBUSY;
	194	}
	195	#else
512bbd6a	196	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	197	{
	198	int minor;
	199
	200	switch (type) {
	201	case SNDRV_DEVICE_TYPE_SEQUENCER:
	202	case SNDRV_DEVICE_TYPE_TIMER:
	203	minor = type;
	204	break;
	205	case SNDRV_DEVICE_TYPE_CONTROL:
	206	snd_assert(card != NULL, return -EINVAL);
	207	minor = SNDRV_MINOR(card->number, type);
	208	break;
	209	case SNDRV_DEVICE_TYPE_HWDEP:
	210	case SNDRV_DEVICE_TYPE_RAWMIDI:
	211	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	212	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	213	snd_assert(card != NULL, return -EINVAL);
	214	minor = SNDRV_MINOR(card->number, type + dev);
	215	break;
	216	default:
	217	return -EINVAL;
	218	}
	219	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	220	return minor;
	221	}
332682b1	222	#endif
1da177e4 LT	223
	224	/**
	225	* snd_register_device - Register the ALSA device file for the card
	226	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	227	* @card: the card instance
	228	* @dev: the device index
2af677fc	229	* @f_ops: the file operations
f87135f5	230	* @private_data: user pointer for f_ops->open()
1da177e4 LT	231	* @name: the device file name
	232	*
	233	* Registers an ALSA device file for the given card.
	234	* The operators have to be set in reg parameter.
	235	*
	236	* Retrurns zero if successful, or a negative error code on failure.
	237	*/
2af677fc	238	int snd_register_device(int type, struct snd_card *card, int dev,
99ac48f5	239	const struct file_operations f_ops, void private_data,
f87135f5	240	const char *name)
1da177e4	241	{
332682b1	242	int minor;
512bbd6a	243	struct snd_minor *preg;
1da177e4 LT	244	struct device *device = NULL;
1da177e4 LT	245
1da177e4	246	snd_assert(name, return -EINVAL);
562b590d	247	preg = kmalloc(sizeof *preg, GFP_KERNEL);
1da177e4 LT	248	if (preg == NULL)
1da177e4 LT	249	return -ENOMEM;
2af677fc	250	preg->type = type;
6983b724	251	preg->card = card ? card->number : -1;
1da177e4	252	preg->device = dev;
2af677fc	253	preg->f_ops = f_ops;
f87135f5	254	preg->private_data = private_data;
1a60d4c5	255	mutex_lock(&sound_mutex);
332682b1 CL	256	#ifdef CONFIG_SND_DYNAMIC_MINORS
	257	minor = snd_find_free_minor();
	258	#else
	259	minor = snd_kernel_minor(type, card, dev);
	260	if (minor >= 0 && snd_minors[minor])
	261	minor = -EBUSY;
	262	#endif
	263	if (minor < 0) {
1a60d4c5	264	mutex_unlock(&sound_mutex);
1da177e4	265	kfree(preg);
332682b1	266	return minor;
1da177e4	267	}
6983b724	268	snd_minors[minor] = preg;
3e23c658	269	if (card)
1da177e4	270	device = card->dev;
9d19f48c TI	271	preg->class_dev = class_device_create(sound_class, NULL,
	272	MKDEV(major, minor),
	273	device, "%s", name);
	274	if (preg->class_dev)
	275	class_set_devdata(preg->class_dev, private_data);
1da177e4	276
1a60d4c5	277	mutex_unlock(&sound_mutex);
1da177e4 LT	278	return 0;
	279	}
	280
c0d3fb39 TI	281	EXPORT_SYMBOL(snd_register_device);
c0d3fb39 TI	282
9d19f48c TI	283	/* find the matching minor record
	284	* return the index of snd_minor, or -1 if not found
	285	*/
	286	static int find_snd_minor(int type, struct snd_card *card, int dev)
	287	{
	288	int cardnum, minor;
	289	struct snd_minor *mptr;
	290
	291	cardnum = card ? card->number : -1;
	292	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
	293	if ((mptr = snd_minors[minor]) != NULL &&
	294	mptr->type == type &&
	295	mptr->card == cardnum &&
	296	mptr->device == dev)
	297	return minor;
	298	return -1;
	299	}
	300
1da177e4 LT	301	/**
	302	* snd_unregister_device - unregister the device on the given card
	303	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	304	* @card: the card instance
	305	* @dev: the device index
	306	*
	307	* Unregisters the device file already registered via
	308	* snd_register_device().
	309	*
	310	* Returns zero if sucecessful, or a negative error code on failure
	311	*/
512bbd6a	312	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4	313	{
9d19f48c	314	int minor;
1da177e4	315
1a60d4c5	316	mutex_lock(&sound_mutex);
9d19f48c TI	317	minor = find_snd_minor(type, card, dev);
9d19f48c TI	318	if (minor < 0) {
1a60d4c5	319	mutex_unlock(&sound_mutex);
1da177e4 LT	320	return -EINVAL;
	321	}
	322
619e666b	323	class_device_destroy(sound_class, MKDEV(major, minor));
1da177e4	324
9d19f48c	325	kfree(snd_minors[minor]);
6983b724	326	snd_minors[minor] = NULL;
1a60d4c5	327	mutex_unlock(&sound_mutex);
1da177e4 LT	328	return 0;
	329	}
	330
c0d3fb39 TI	331	EXPORT_SYMBOL(snd_unregister_device);
c0d3fb39 TI	332
9d19f48c TI	333	int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
	334	const struct class_device_attribute *attr)
	335	{
	336	int minor, ret = -EINVAL;
	337	struct class_device *cdev;
	338
	339	mutex_lock(&sound_mutex);
	340	minor = find_snd_minor(type, card, dev);
	341	if (minor >= 0 && (cdev = snd_minors[minor]->class_dev) != NULL)
	342	ret = class_device_create_file(cdev, attr);
	343	mutex_unlock(&sound_mutex);
	344	return ret;
	345
	346	}
	347
	348	EXPORT_SYMBOL(snd_add_device_sysfs_file);
	349
e28563cc	350	#ifdef CONFIG_PROC_FS
1da177e4 LT	351	/*
	352	* INFO PART
	353	*/
	354
6581f4e7	355	static struct snd_info_entry *snd_minor_info_entry;
1da177e4	356
2af677fc CL	357	static const char *snd_device_type_name(int type)
	358	{
	359	switch (type) {
	360	case SNDRV_DEVICE_TYPE_CONTROL:
	361	return "control";
	362	case SNDRV_DEVICE_TYPE_HWDEP:
	363	return "hardware dependent";
	364	case SNDRV_DEVICE_TYPE_RAWMIDI:
	365	return "raw midi";
	366	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	367	return "digital audio playback";
	368	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	369	return "digital audio capture";
	370	case SNDRV_DEVICE_TYPE_SEQUENCER:
	371	return "sequencer";
	372	case SNDRV_DEVICE_TYPE_TIMER:
	373	return "timer";
	374	default:
	375	return "?";
	376	}
	377	}
	378
512bbd6a	379	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	380	{
6983b724	381	int minor;
512bbd6a	382	struct snd_minor *mptr;
1da177e4	383
1a60d4c5	384	mutex_lock(&sound_mutex);
6983b724 CL	385	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	386	if (!(mptr = snd_minors[minor]))
	387	continue;
	388	if (mptr->card >= 0) {
	389	if (mptr->device >= 0)
d001544d	390	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	391	minor, mptr->card, mptr->device,
	392	snd_device_type_name(mptr->type));
	393	else
d001544d	394	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	395	minor, mptr->card,
	396	snd_device_type_name(mptr->type));
	397	} else
d001544d	398	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	399	snd_device_type_name(mptr->type));
1da177e4	400	}
1a60d4c5	401	mutex_unlock(&sound_mutex);
1da177e4 LT	402	}
	403
	404	int __init snd_minor_info_init(void)
	405	{
512bbd6a	406	struct snd_info_entry *entry;
1da177e4 LT	407
	408	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	409	if (entry) {
1da177e4 LT	410	entry->c.text.read = snd_minor_info_read;
	411	if (snd_info_register(entry) < 0) {
	412	snd_info_free_entry(entry);
	413	entry = NULL;
	414	}
	415	}
	416	snd_minor_info_entry = entry;
	417	return 0;
	418	}
	419
	420	int __exit snd_minor_info_done(void)
	421	{
746d4a02	422	snd_info_free_entry(snd_minor_info_entry);
1da177e4 LT	423	return 0;
1da177e4 LT	424	}
e28563cc	425	#endif /* CONFIG_PROC_FS */
1da177e4 LT	426
	427	/*
	428	* INIT PART
	429	*/
	430
	431	static int __init alsa_sound_init(void)
	432	{
1da177e4 LT	433	snd_major = major;
1da177e4 LT	434	snd_ecards_limit = cards_limit;
1da177e4 LT	435	if (register_chrdev(major, "alsa", &snd_fops)) {
1da177e4 LT	436	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
1da177e4 LT	437	return -EIO;
1da177e4 LT	438	}
1da177e4	439	if (snd_info_init() < 0) {
1da177e4	440	unregister_chrdev(major, "alsa");
1da177e4 LT	441	return -ENOMEM;
	442	}
	443	snd_info_minor_register();
1da177e4 LT	444	#ifndef MODULE
	445	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
	446	#endif
	447	return 0;
	448	}
	449
	450	static void __exit alsa_sound_exit(void)
	451	{
1da177e4 LT	452	snd_info_minor_unregister();
1da177e4 LT	453	snd_info_done();
1da177e4 LT	454	if (unregister_chrdev(major, "alsa") != 0)
1da177e4 LT	455	snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
1da177e4 LT	456	}
	457
	458	module_init(alsa_sound_init)
	459	module_exit(alsa_sound_exit)