[mirror_ubuntu-artful-kernel.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/smp_lock.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_MODULES

/**
 * 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 request_module.  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	/* modular kernel */

/**
 * 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_MODULES
		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;
}


/* BKL pushdown: nasty #ifdef avoidance wrapper */
static int snd_open(struct inode *inode, struct file *file)
{
	int ret;

	lock_kernel();
	ret = __snd_open(inode, file);
	unlock_kernel();
	return ret;
}

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_drvdata(sound_class, device,
					  MKDEV(major, minor),
					  private_data, "%s", name);
	if (IS_ERR(preg->dev)) {
		snd_minors[minor] = NULL;
		mutex_unlock(&sound_mutex);
		minor = PTR_ERR(preg->dev);
		kfree(preg);
		return minor;
	}

	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>
1da177e4 LT	23	#include <linux/slab.h>
78a3c3d7	24	#include <linux/smp_lock.h>
1da177e4	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	44
c1017a4c	45	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	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
ee2da997	64	#ifdef CONFIG_MODULES
1da177e4 LT	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
ee2da997	71	* via request_module. Returns immediately if already loaded.
1da177e4 LT	72	*/
	73	void snd_request_card(int card)
	74	{
746df948	75	if (snd_card_locked(card))
1da177e4 LT	76	return;
	77	if (card < 0 \|\| card >= cards_limit)
	78	return;
	79	request_module("snd-card-%i", card);
	80	}
	81
c0d3fb39 TI	82	EXPORT_SYMBOL(snd_request_card);
c0d3fb39 TI	83
1da177e4 LT	84	static void snd_request_other(int minor)
	85	{
	86	char *str;
	87
1da177e4 LT	88	switch (minor) {
	89	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	90	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	91	default: return;
	92	}
	93	request_module(str);
	94	}
	95
ee2da997	96	#endif /* modular kernel */
1da177e4	97
f87135f5 CL	98	/**
	99	* snd_lookup_minor_data - get user data of a registered device
	100	* @minor: the minor number
	101	* @type: device type (SNDRV_DEVICE_TYPE_XXX)
	102	*
	103	* Checks that a minor device with the specified type is registered, and returns
	104	* its user data pointer.
	105	*/
	106	void *snd_lookup_minor_data(unsigned int minor, int type)
	107	{
	108	struct snd_minor *mreg;
	109	void *private_data;
	110
3a63e444	111	if (minor >= ARRAY_SIZE(snd_minors))
f87135f5	112	return NULL;
1a60d4c5	113	mutex_lock(&sound_mutex);
f87135f5 CL	114	mreg = snd_minors[minor];
	115	if (mreg && mreg->type == type)
	116	private_data = mreg->private_data;
	117	else
	118	private_data = NULL;
1a60d4c5	119	mutex_unlock(&sound_mutex);
f87135f5 CL	120	return private_data;
	121	}
	122
c0d3fb39 TI	123	EXPORT_SYMBOL(snd_lookup_minor_data);
c0d3fb39 TI	124
78a3c3d7	125	static int __snd_open(struct inode inode, struct file file)
1da177e4	126	{
332682b1	127	unsigned int minor = iminor(inode);
512bbd6a	128	struct snd_minor *mptr = NULL;
99ac48f5	129	const struct file_operations *old_fops;
1da177e4 LT	130	int err = 0;
1da177e4 LT	131
3a63e444	132	if (minor >= ARRAY_SIZE(snd_minors))
332682b1 CL	133	return -ENODEV;
	134	mptr = snd_minors[minor];
	135	if (mptr == NULL) {
ee2da997	136	#ifdef CONFIG_MODULES
332682b1 CL	137	int dev = SNDRV_MINOR_DEVICE(minor);
	138	if (dev == SNDRV_MINOR_CONTROL) {
	139	/* /dev/aloadC? */
	140	int card = SNDRV_MINOR_CARD(minor);
1da177e4	141	if (snd_cards[card] == NULL)
332682b1 CL	142	snd_request_card(card);
	143	} else if (dev == SNDRV_MINOR_GLOBAL) {
	144	/* /dev/aloadSEQ */
1da177e4	145	snd_request_other(minor);
332682b1 CL	146	}
	147	#ifndef CONFIG_SND_DYNAMIC_MINORS
	148	/* /dev/snd/{controlC?,seq} */
	149	mptr = snd_minors[minor];
	150	if (mptr == NULL)
	151	#endif
1da177e4	152	#endif
332682b1	153	return -ENODEV;
1da177e4	154	}
1da177e4 LT	155	old_fops = file->f_op;
	156	file->f_op = fops_get(mptr->f_ops);
	157	if (file->f_op->open)
	158	err = file->f_op->open(inode, file);
	159	if (err) {
	160	fops_put(file->f_op);
	161	file->f_op = fops_get(old_fops);
	162	}
	163	fops_put(old_fops);
	164	return err;
	165	}
	166
78a3c3d7 JC	167
	168	/* BKL pushdown: nasty #ifdef avoidance wrapper */
	169	static int snd_open(struct inode inode, struct file file)
	170	{
	171	int ret;
	172
	173	lock_kernel();
	174	ret = __snd_open(inode, file);
	175	unlock_kernel();
	176	return ret;
	177	}
	178
9c2e08c5	179	static const struct file_operations snd_fops =
1da177e4 LT	180	{
	181	.owner = THIS_MODULE,
	182	.open = snd_open
	183	};
	184
332682b1 CL	185	#ifdef CONFIG_SND_DYNAMIC_MINORS
	186	static int snd_find_free_minor(void)
	187	{
	188	int minor;
	189
	190	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
	191	/* skip minors still used statically for autoloading devices */
	192	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL \|\|
	193	minor == SNDRV_MINOR_SEQUENCER)
	194	continue;
	195	if (!snd_minors[minor])
	196	return minor;
	197	}
	198	return -EBUSY;
	199	}
	200	#else
512bbd6a	201	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	202	{
	203	int minor;
	204
	205	switch (type) {
	206	case SNDRV_DEVICE_TYPE_SEQUENCER:
	207	case SNDRV_DEVICE_TYPE_TIMER:
	208	minor = type;
	209	break;
	210	case SNDRV_DEVICE_TYPE_CONTROL:
	211	snd_assert(card != NULL, return -EINVAL);
	212	minor = SNDRV_MINOR(card->number, type);
	213	break;
	214	case SNDRV_DEVICE_TYPE_HWDEP:
	215	case SNDRV_DEVICE_TYPE_RAWMIDI:
	216	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	217	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	218	snd_assert(card != NULL, return -EINVAL);
	219	minor = SNDRV_MINOR(card->number, type + dev);
	220	break;
	221	default:
	222	return -EINVAL;
	223	}
	224	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	225	return minor;
	226	}
332682b1	227	#endif
1da177e4 LT	228
1da177e4 LT	229	/**
12b131c4	230	* snd_register_device_for_dev - Register the ALSA device file for the card
1da177e4 LT	231	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	232	* @card: the card instance
	233	* @dev: the device index
2af677fc	234	* @f_ops: the file operations
f87135f5	235	* @private_data: user pointer for f_ops->open()
1da177e4	236	* @name: the device file name
12b131c4	237	* @device: the &struct device to link this new device to
1da177e4 LT	238	*
	239	* Registers an ALSA device file for the given card.
	240	* The operators have to be set in reg parameter.
	241	*
12b131c4	242	* Returns zero if successful, or a negative error code on failure.
1da177e4	243	*/
12b131c4 JB	244	int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
	245	const struct file_operations *f_ops,
	246	void *private_data,
	247	const char name, struct device device)
1da177e4	248	{
332682b1	249	int minor;
512bbd6a	250	struct snd_minor *preg;
1da177e4	251
1da177e4	252	snd_assert(name, return -EINVAL);
562b590d	253	preg = kmalloc(sizeof *preg, GFP_KERNEL);
1da177e4 LT	254	if (preg == NULL)
1da177e4 LT	255	return -ENOMEM;
2af677fc	256	preg->type = type;
6983b724	257	preg->card = card ? card->number : -1;
1da177e4	258	preg->device = dev;
2af677fc	259	preg->f_ops = f_ops;
f87135f5	260	preg->private_data = private_data;
1a60d4c5	261	mutex_lock(&sound_mutex);
332682b1 CL	262	#ifdef CONFIG_SND_DYNAMIC_MINORS
	263	minor = snd_find_free_minor();
	264	#else
	265	minor = snd_kernel_minor(type, card, dev);
	266	if (minor >= 0 && snd_minors[minor])
	267	minor = -EBUSY;
	268	#endif
	269	if (minor < 0) {
1a60d4c5	270	mutex_unlock(&sound_mutex);
1da177e4	271	kfree(preg);
332682b1	272	return minor;
1da177e4	273	}
6983b724	274	snd_minors[minor] = preg;
5d99a8b8 GKH	275	preg->dev = device_create_drvdata(sound_class, device,
	276	MKDEV(major, minor),
	277	private_data, "%s", name);
2469049e MK	278	if (IS_ERR(preg->dev)) {
	279	snd_minors[minor] = NULL;
	280	mutex_unlock(&sound_mutex);
	281	minor = PTR_ERR(preg->dev);
	282	kfree(preg);
	283	return minor;
	284	}
	285
1a60d4c5	286	mutex_unlock(&sound_mutex);
1da177e4 LT	287	return 0;
	288	}
	289
12b131c4	290	EXPORT_SYMBOL(snd_register_device_for_dev);
c0d3fb39	291
9d19f48c TI	292	/* find the matching minor record
	293	* return the index of snd_minor, or -1 if not found
	294	*/
	295	static int find_snd_minor(int type, struct snd_card *card, int dev)
	296	{
	297	int cardnum, minor;
	298	struct snd_minor *mptr;
	299
	300	cardnum = card ? card->number : -1;
	301	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
	302	if ((mptr = snd_minors[minor]) != NULL &&
	303	mptr->type == type &&
	304	mptr->card == cardnum &&
	305	mptr->device == dev)
	306	return minor;
	307	return -1;
	308	}
	309
1da177e4 LT	310	/**
	311	* snd_unregister_device - unregister the device on the given card
	312	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	313	* @card: the card instance
	314	* @dev: the device index
	315	*
	316	* Unregisters the device file already registered via
	317	* snd_register_device().
	318	*
	319	* Returns zero if sucecessful, or a negative error code on failure
	320	*/
512bbd6a	321	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4	322	{
9d19f48c	323	int minor;
1da177e4	324
1a60d4c5	325	mutex_lock(&sound_mutex);
9d19f48c TI	326	minor = find_snd_minor(type, card, dev);
9d19f48c TI	327	if (minor < 0) {
1a60d4c5	328	mutex_unlock(&sound_mutex);
1da177e4 LT	329	return -EINVAL;
	330	}
	331
d80f19fa	332	device_destroy(sound_class, MKDEV(major, minor));
1da177e4	333
9d19f48c	334	kfree(snd_minors[minor]);
6983b724	335	snd_minors[minor] = NULL;
1a60d4c5	336	mutex_unlock(&sound_mutex);
1da177e4 LT	337	return 0;
	338	}
	339
c0d3fb39 TI	340	EXPORT_SYMBOL(snd_unregister_device);
c0d3fb39 TI	341
9d19f48c	342	int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
d80f19fa	343	struct device_attribute *attr)
9d19f48c TI	344	{
9d19f48c TI	345	int minor, ret = -EINVAL;
d80f19fa	346	struct device *d;
9d19f48c TI	347
	348	mutex_lock(&sound_mutex);
	349	minor = find_snd_minor(type, card, dev);
d80f19fa GKH	350	if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL)
d80f19fa GKH	351	ret = device_create_file(d, attr);
9d19f48c TI	352	mutex_unlock(&sound_mutex);
	353	return ret;
	354
	355	}
	356
	357	EXPORT_SYMBOL(snd_add_device_sysfs_file);
	358
e28563cc	359	#ifdef CONFIG_PROC_FS
1da177e4 LT	360	/*
	361	* INFO PART
	362	*/
	363
6581f4e7	364	static struct snd_info_entry *snd_minor_info_entry;
1da177e4	365
2af677fc CL	366	static const char *snd_device_type_name(int type)
	367	{
	368	switch (type) {
	369	case SNDRV_DEVICE_TYPE_CONTROL:
	370	return "control";
	371	case SNDRV_DEVICE_TYPE_HWDEP:
	372	return "hardware dependent";
	373	case SNDRV_DEVICE_TYPE_RAWMIDI:
	374	return "raw midi";
	375	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	376	return "digital audio playback";
	377	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	378	return "digital audio capture";
	379	case SNDRV_DEVICE_TYPE_SEQUENCER:
	380	return "sequencer";
	381	case SNDRV_DEVICE_TYPE_TIMER:
	382	return "timer";
	383	default:
	384	return "?";
	385	}
	386	}
	387
512bbd6a	388	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	389	{
6983b724	390	int minor;
512bbd6a	391	struct snd_minor *mptr;
1da177e4	392
1a60d4c5	393	mutex_lock(&sound_mutex);
6983b724 CL	394	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	395	if (!(mptr = snd_minors[minor]))
	396	continue;
	397	if (mptr->card >= 0) {
	398	if (mptr->device >= 0)
d001544d	399	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	400	minor, mptr->card, mptr->device,
	401	snd_device_type_name(mptr->type));
	402	else
d001544d	403	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	404	minor, mptr->card,
	405	snd_device_type_name(mptr->type));
	406	} else
d001544d	407	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	408	snd_device_type_name(mptr->type));
1da177e4	409	}
1a60d4c5	410	mutex_unlock(&sound_mutex);
1da177e4 LT	411	}
	412
	413	int __init snd_minor_info_init(void)
	414	{
512bbd6a	415	struct snd_info_entry *entry;
1da177e4 LT	416
	417	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	418	if (entry) {
1da177e4 LT	419	entry->c.text.read = snd_minor_info_read;
	420	if (snd_info_register(entry) < 0) {
	421	snd_info_free_entry(entry);
	422	entry = NULL;
	423	}
	424	}
	425	snd_minor_info_entry = entry;
	426	return 0;
	427	}
	428
	429	int __exit snd_minor_info_done(void)
	430	{
746d4a02	431	snd_info_free_entry(snd_minor_info_entry);
1da177e4 LT	432	return 0;
1da177e4 LT	433	}
e28563cc	434	#endif /* CONFIG_PROC_FS */
1da177e4 LT	435
	436	/*
	437	* INIT PART
	438	*/
	439
	440	static int __init alsa_sound_init(void)
	441	{
1da177e4 LT	442	snd_major = major;
1da177e4 LT	443	snd_ecards_limit = cards_limit;
1da177e4 LT	444	if (register_chrdev(major, "alsa", &snd_fops)) {
1da177e4 LT	445	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
1da177e4 LT	446	return -EIO;
1da177e4 LT	447	}
1da177e4	448	if (snd_info_init() < 0) {
1da177e4	449	unregister_chrdev(major, "alsa");
1da177e4 LT	450	return -ENOMEM;
	451	}
	452	snd_info_minor_register();
1da177e4 LT	453	#ifndef MODULE
	454	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
	455	#endif
	456	return 0;
	457	}
	458
	459	static void __exit alsa_sound_exit(void)
	460	{
1da177e4 LT	461	snd_info_minor_unregister();
1da177e4 LT	462	snd_info_done();
68fc4fab	463	unregister_chrdev(major, "alsa");
1da177e4 LT	464	}
	465
	466	module_init(alsa_sound_init)
	467	module_exit(alsa_sound_exit)