[linux-2.6-block.git] / sound / core / sound.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Advanced Linux Sound Architecture
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/device.h>
#include <linux/module.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/info.h>
#include <sound/control.h>
#include <sound/initval.h>
#include <linux/kmod.h>
#include <linux/mutex.h>

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.
 *
 * This function increments the reference counter of the card instance
 * if an associated instance with the given minor number and type is found.
 * The caller must call snd_card_unref() appropriately later.
 *
 * Return: The user data pointer if the specified device is found. %NULL
 * otherwise.
 */
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;
		if (private_data && mreg->card_ptr)
			get_device(&mreg->card_ptr->card_dev);
	} else
		private_data = NULL;
	mutex_unlock(&sound_mutex);
	return private_data;
}
EXPORT_SYMBOL(snd_lookup_minor_data);

#ifdef CONFIG_MODULES
static struct snd_minor *autoload_device(unsigned int minor)
{
	int dev;
	mutex_unlock(&sound_mutex); /* release lock temporarily */
	dev = SNDRV_MINOR_DEVICE(minor);
	if (dev == SNDRV_MINOR_CONTROL) {
		/* /dev/aloadC? */
		int card = SNDRV_MINOR_CARD(minor);
		struct snd_card *ref = snd_card_ref(card);
		if (!ref)
			snd_request_card(card);
		else
			snd_card_unref(ref);
	} else if (dev == SNDRV_MINOR_GLOBAL) {
		/* /dev/aloadSEQ */
		snd_request_other(minor);
	}
	mutex_lock(&sound_mutex); /* reacuire lock */
	return snd_minors[minor];
}
#else /* !CONFIG_MODULES */
#define autoload_device(minor)	NULL
#endif /* CONFIG_MODULES */

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

	if (minor >= ARRAY_SIZE(snd_minors))
		return -ENODEV;
	mutex_lock(&sound_mutex);
	mptr = snd_minors[minor];
	if (mptr == NULL) {
		mptr = autoload_device(minor);
		if (!mptr) {
			mutex_unlock(&sound_mutex);
			return -ENODEV;
		}
	}
	new_fops = fops_get(mptr->f_ops);
	mutex_unlock(&sound_mutex);
	if (!new_fops)
		return -ENODEV;
	replace_fops(file, new_fops);

	if (file->f_op->open)
		err = file->f_op->open(inode, file);
	return err;
}

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

#ifdef CONFIG_SND_DYNAMIC_MINORS
static int snd_find_free_minor(int type, struct snd_card *card, int dev)
{
	int minor;

	/* static minors for module auto loading */
	if (type == SNDRV_DEVICE_TYPE_SEQUENCER)
		return SNDRV_MINOR_SEQUENCER;
	if (type == SNDRV_DEVICE_TYPE_TIMER)
		return SNDRV_MINOR_TIMER;

	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
		/* skip static minors still used for module auto loading */
		if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL)
			continue;
		if (minor == SNDRV_MINOR_SEQUENCER ||
		    minor == SNDRV_MINOR_TIMER)
			continue;
		if (!snd_minors[minor])
			return minor;
	}
	return -EBUSY;
}
#else
static int snd_find_free_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:
		if (snd_BUG_ON(!card))
			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:
	case SNDRV_DEVICE_TYPE_COMPRESS:
		if (snd_BUG_ON(!card))
			return -EINVAL;
		minor = SNDRV_MINOR(card->number, type + dev);
		break;
	default:
		return -EINVAL;
	}
	if (snd_BUG_ON(minor < 0 || minor >= SNDRV_OS_MINORS))
		return -EINVAL;
	if (snd_minors[minor])
		return -EBUSY;
	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()
 * @device: the device to register
 *
 * Registers an ALSA device file for the given card.
 * The operators have to be set in reg parameter.
 *
 * Return: 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, struct device *device)
{
	int minor;
	int err = 0;
	struct snd_minor *preg;

	if (snd_BUG_ON(!device))
		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;
	preg->card_ptr = card;
	mutex_lock(&sound_mutex);
	minor = snd_find_free_minor(type, card, dev);
	if (minor < 0) {
		err = minor;
		goto error;
	}

	preg->dev = device;
	device->devt = MKDEV(major, minor);
	err = device_add(device);
	if (err < 0)
		goto error;

	snd_minors[minor] = preg;
 error:
	mutex_unlock(&sound_mutex);
	if (err < 0)
		kfree(preg);
	return err;
}
EXPORT_SYMBOL(snd_register_device);

/**
 * snd_unregister_device - unregister the device on the given card
 * @dev: the device instance
 *
 * Unregisters the device file already registered via
 * snd_register_device().
 *
 * Return: Zero if successful, or a negative error code on failure.
 */
int snd_unregister_device(struct device *dev)
{
	int minor;
	struct snd_minor *preg;

	mutex_lock(&sound_mutex);
	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
		preg = snd_minors[minor];
		if (preg && preg->dev == dev) {
			snd_minors[minor] = NULL;
			device_del(dev);
			kfree(preg);
			break;
		}
	}
	mutex_unlock(&sound_mutex);
	if (minor >= ARRAY_SIZE(snd_minors))
		return -ENOENT;
	return 0;
}
EXPORT_SYMBOL(snd_unregister_device);

#ifdef CONFIG_SND_PROC_FS
/*
 *  INFO PART
 */
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)
		return -ENOMEM;
	entry->c.text.read = snd_minor_info_read;
	return snd_info_register(entry); /* freed in error path */
}
#endif /* CONFIG_SND_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)) {
		pr_err("ALSA core: unable to register native major device number %d\n", major);
		return -EIO;
	}
	if (snd_info_init() < 0) {
		unregister_chrdev(major, "alsa");
		return -ENOMEM;
	}
#ifndef MODULE
	pr_info("Advanced Linux Sound Architecture Driver Initialized.\n");
#endif
	return 0;
}

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

subsys_initcall(alsa_sound_init);
module_exit(alsa_sound_exit);
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/*
1da177e4 LT	3	* Advanced Linux Sound Architecture
c1017a4c	4	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	5	*/
1da177e4 LT	6
1da177e4 LT	7	#include <linux/init.h>
	8	#include <linux/slab.h>
	9	#include <linux/time.h>
9a1a2a1d	10	#include <linux/device.h>
65a77217	11	#include <linux/module.h>
1da177e4 LT	12	#include <sound/core.h>
	13	#include <sound/minors.h>
	14	#include <sound/info.h>
1da177e4 LT	15	#include <sound/control.h>
	16	#include <sound/initval.h>
	17	#include <linux/kmod.h>
1a60d4c5	18	#include <linux/mutex.h>
1da177e4	19
1da177e4 LT	20	static int major = CONFIG_SND_MAJOR;
1da177e4 LT	21	int snd_major;
c0d3fb39 TI	22	EXPORT_SYMBOL(snd_major);
c0d3fb39 TI	23
1da177e4	24	static int cards_limit = 1;
1da177e4	25
c1017a4c	26	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	27	MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
	28	MODULE_LICENSE("GPL");
	29	module_param(major, int, 0444);
	30	MODULE_PARM_DESC(major, "Major # for sound driver.");
	31	module_param(cards_limit, int, 0444);
	32	MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
1da177e4 LT	33	MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
	34
	35	/* this one holds the actual max. card number currently available.
	36	* as default, it's identical with cards_limit option. when more
	37	* modules are loaded manually, this limit number increases, too.
	38	*/
	39	int snd_ecards_limit;
c0d3fb39	40	EXPORT_SYMBOL(snd_ecards_limit);
1da177e4	41
6983b724	42	static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
1a60d4c5	43	static DEFINE_MUTEX(sound_mutex);
1da177e4	44
ee2da997	45	#ifdef CONFIG_MODULES
1da177e4 LT	46
	47	/**
	48	* snd_request_card - try to load the card module
	49	* @card: the card number
	50	*
	51	* Tries to load the module "snd-card-X" for the given card number
ee2da997	52	* via request_module. Returns immediately if already loaded.
1da177e4 LT	53	*/
	54	void snd_request_card(int card)
	55	{
746df948	56	if (snd_card_locked(card))
1da177e4 LT	57	return;
	58	if (card < 0 \|\| card >= cards_limit)
	59	return;
	60	request_module("snd-card-%i", card);
	61	}
c0d3fb39 TI	62	EXPORT_SYMBOL(snd_request_card);
c0d3fb39 TI	63
1da177e4 LT	64	static void snd_request_other(int minor)
	65	{
	66	char *str;
	67
1da177e4 LT	68	switch (minor) {
	69	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	70	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	71	default: return;
	72	}
	73	request_module(str);
	74	}
	75
ee2da997	76	#endif /* modular kernel */
1da177e4	77
f87135f5 CL	78	/**
	79	* snd_lookup_minor_data - get user data of a registered device
	80	* @minor: the minor number
	81	* @type: device type (SNDRV_DEVICE_TYPE_XXX)
	82	*
	83	* Checks that a minor device with the specified type is registered, and returns
	84	* its user data pointer.
a0830dbd TI	85	*
	86	* This function increments the reference counter of the card instance
	87	* if an associated instance with the given minor number and type is found.
	88	* The caller must call snd_card_unref() appropriately later.
eb7c06e8 YB	89	*
	90	* Return: The user data pointer if the specified device is found. %NULL
	91	* otherwise.
f87135f5 CL	92	*/
	93	void *snd_lookup_minor_data(unsigned int minor, int type)
	94	{
	95	struct snd_minor *mreg;
	96	void *private_data;
	97
3a63e444	98	if (minor >= ARRAY_SIZE(snd_minors))
f87135f5	99	return NULL;
1a60d4c5	100	mutex_lock(&sound_mutex);
f87135f5	101	mreg = snd_minors[minor];
a0830dbd	102	if (mreg && mreg->type == type) {
f87135f5	103	private_data = mreg->private_data;
8bb4d9ce	104	if (private_data && mreg->card_ptr)
f2464064	105	get_device(&mreg->card_ptr->card_dev);
a0830dbd	106	} else
f87135f5	107	private_data = NULL;
1a60d4c5	108	mutex_unlock(&sound_mutex);
f87135f5 CL	109	return private_data;
f87135f5 CL	110	}
c0d3fb39 TI	111	EXPORT_SYMBOL(snd_lookup_minor_data);
c0d3fb39 TI	112
4cf19b84 TI	113	#ifdef CONFIG_MODULES
	114	static struct snd_minor *autoload_device(unsigned int minor)
	115	{
	116	int dev;
	117	mutex_unlock(&sound_mutex); /* release lock temporarily */
	118	dev = SNDRV_MINOR_DEVICE(minor);
	119	if (dev == SNDRV_MINOR_CONTROL) {
	120	/* /dev/aloadC? */
	121	int card = SNDRV_MINOR_CARD(minor);
f4fa9689 TI	122	struct snd_card *ref = snd_card_ref(card);
f4fa9689 TI	123	if (!ref)
4cf19b84	124	snd_request_card(card);
f4fa9689 TI	125	else
f4fa9689 TI	126	snd_card_unref(ref);
4cf19b84 TI	127	} else if (dev == SNDRV_MINOR_GLOBAL) {
	128	/* /dev/aloadSEQ */
	129	snd_request_other(minor);
	130	}
	131	mutex_lock(&sound_mutex); /* reacuire lock */
	132	return snd_minors[minor];
	133	}
	134	#else /* !CONFIG_MODULES */
	135	#define autoload_device(minor) NULL
	136	#endif /* CONFIG_MODULES */
	137
	138	static int snd_open(struct inode inode, struct file file)
1da177e4	139	{
332682b1	140	unsigned int minor = iminor(inode);
512bbd6a	141	struct snd_minor *mptr = NULL;
e84f9e57	142	const struct file_operations *new_fops;
1da177e4 LT	143	int err = 0;
1da177e4 LT	144
3a63e444	145	if (minor >= ARRAY_SIZE(snd_minors))
332682b1	146	return -ENODEV;
4cf19b84	147	mutex_lock(&sound_mutex);
332682b1 CL	148	mptr = snd_minors[minor];
332682b1 CL	149	if (mptr == NULL) {
4cf19b84 TI	150	mptr = autoload_device(minor);
	151	if (!mptr) {
	152	mutex_unlock(&sound_mutex);
332682b1	153	return -ENODEV;
4cf19b84	154	}
1da177e4	155	}
e84f9e57	156	new_fops = fops_get(mptr->f_ops);
4cf19b84	157	mutex_unlock(&sound_mutex);
e84f9e57 AV	158	if (!new_fops)
	159	return -ENODEV;
	160	replace_fops(file, new_fops);
4cf19b84	161
e84f9e57	162	if (file->f_op->open)
1da177e4	163	err = file->f_op->open(inode, file);
1da177e4 LT	164	return err;
	165	}
	166
9c2e08c5	167	static const struct file_operations snd_fops =
1da177e4 LT	168	{
1da177e4 LT	169	.owner = THIS_MODULE,
6038f373 AB	170	.open = snd_open,
6038f373 AB	171	.llseek = noop_llseek,
1da177e4 LT	172	};
1da177e4 LT	173
332682b1	174	#ifdef CONFIG_SND_DYNAMIC_MINORS
38ebb703	175	static int snd_find_free_minor(int type, struct snd_card *card, int dev)
332682b1 CL	176	{
	177	int minor;
	178
03cfe6f5 KS	179	/* static minors for module auto loading */
	180	if (type == SNDRV_DEVICE_TYPE_SEQUENCER)
	181	return SNDRV_MINOR_SEQUENCER;
	182	if (type == SNDRV_DEVICE_TYPE_TIMER)
	183	return SNDRV_MINOR_TIMER;
	184
332682b1	185	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
03cfe6f5 KS	186	/* skip static minors still used for module auto loading */
	187	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL)
	188	continue;
	189	if (minor == SNDRV_MINOR_SEQUENCER \|\|
	190	minor == SNDRV_MINOR_TIMER)
332682b1 CL	191	continue;
	192	if (!snd_minors[minor])
	193	return minor;
	194	}
	195	return -EBUSY;
	196	}
	197	#else
38ebb703	198	static int snd_find_free_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	199	{
	200	int minor;
	201
	202	switch (type) {
	203	case SNDRV_DEVICE_TYPE_SEQUENCER:
	204	case SNDRV_DEVICE_TYPE_TIMER:
	205	minor = type;
	206	break;
	207	case SNDRV_DEVICE_TYPE_CONTROL:
7eaa943c TI	208	if (snd_BUG_ON(!card))
7eaa943c TI	209	return -EINVAL;
1da177e4 LT	210	minor = SNDRV_MINOR(card->number, type);
	211	break;
	212	case SNDRV_DEVICE_TYPE_HWDEP:
	213	case SNDRV_DEVICE_TYPE_RAWMIDI:
	214	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	215	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
3eafc959	216	case SNDRV_DEVICE_TYPE_COMPRESS:
7eaa943c TI	217	if (snd_BUG_ON(!card))
7eaa943c TI	218	return -EINVAL;
1da177e4 LT	219	minor = SNDRV_MINOR(card->number, type + dev);
	220	break;
	221	default:
	222	return -EINVAL;
	223	}
7eaa943c TI	224	if (snd_BUG_ON(minor < 0 \|\| minor >= SNDRV_OS_MINORS))
7eaa943c TI	225	return -EINVAL;
38ebb703 TI	226	if (snd_minors[minor])
38ebb703 TI	227	return -EBUSY;
1da177e4 LT	228	return minor;
1da177e4 LT	229	}
332682b1	230	#endif
1da177e4 LT	231
1da177e4 LT	232	/**
40a4b263	233	* snd_register_device - Register the ALSA device file for the card
1da177e4 LT	234	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	235	* @card: the card instance
	236	* @dev: the device index
2af677fc	237	* @f_ops: the file operations
f87135f5	238	* @private_data: user pointer for f_ops->open()
40a4b263	239	* @device: the device to register
1da177e4 LT	240	*
	241	* Registers an ALSA device file for the given card.
	242	* The operators have to be set in reg parameter.
	243	*
eb7c06e8	244	* Return: Zero if successful, or a negative error code on failure.
1da177e4	245	*/
40a4b263 TI	246	int snd_register_device(int type, struct snd_card *card, int dev,
	247	const struct file_operations *f_ops,
	248	void private_data, struct device device)
1da177e4	249	{
332682b1	250	int minor;
92b7952d	251	int err = 0;
512bbd6a	252	struct snd_minor *preg;
1da177e4	253
40a4b263 TI	254	if (snd_BUG_ON(!device))
	255	return -EINVAL;
	256
562b590d	257	preg = kmalloc(sizeof *preg, GFP_KERNEL);
1da177e4 LT	258	if (preg == NULL)
1da177e4 LT	259	return -ENOMEM;
2af677fc	260	preg->type = type;
6983b724	261	preg->card = card ? card->number : -1;
1da177e4	262	preg->device = dev;
2af677fc	263	preg->f_ops = f_ops;
f87135f5	264	preg->private_data = private_data;
a0830dbd	265	preg->card_ptr = card;
1a60d4c5	266	mutex_lock(&sound_mutex);
38ebb703	267	minor = snd_find_free_minor(type, card, dev);
332682b1	268	if (minor < 0) {
92b7952d TI	269	err = minor;
92b7952d TI	270	goto error;
1da177e4	271	}
92b7952d	272
40a4b263 TI	273	preg->dev = device;
	274	device->devt = MKDEV(major, minor);
	275	err = device_add(device);
92b7952d TI	276	if (err < 0)
92b7952d TI	277	goto error;
2469049e	278
92b7952d TI	279	snd_minors[minor] = preg;
92b7952d TI	280	error:
1a60d4c5	281	mutex_unlock(&sound_mutex);
92b7952d TI	282	if (err < 0)
	283	kfree(preg);
	284	return err;
1da177e4	285	}
40a4b263	286	EXPORT_SYMBOL(snd_register_device);
c0d3fb39	287
1da177e4 LT	288	/**
1da177e4 LT	289	* snd_unregister_device - unregister the device on the given card
40a4b263	290	* @dev: the device instance
1da177e4 LT	291	*
	292	* Unregisters the device file already registered via
	293	* snd_register_device().
	294	*
eb7c06e8	295	* Return: Zero if successful, or a negative error code on failure.
1da177e4	296	*/
40a4b263	297	int snd_unregister_device(struct device *dev)
1da177e4	298	{
9d19f48c	299	int minor;
92b7952d	300	struct snd_minor *preg;
1da177e4	301
1a60d4c5	302	mutex_lock(&sound_mutex);
40a4b263 TI	303	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
	304	preg = snd_minors[minor];
	305	if (preg && preg->dev == dev) {
	306	snd_minors[minor] = NULL;
	307	device_del(dev);
	308	kfree(preg);
	309	break;
	310	}
1da177e4	311	}
1a60d4c5	312	mutex_unlock(&sound_mutex);
40a4b263 TI	313	if (minor >= ARRAY_SIZE(snd_minors))
40a4b263 TI	314	return -ENOENT;
1da177e4 LT	315	return 0;
1da177e4 LT	316	}
c0d3fb39 TI	317	EXPORT_SYMBOL(snd_unregister_device);
c0d3fb39 TI	318
cd6a6503	319	#ifdef CONFIG_SND_PROC_FS
1da177e4 LT	320	/*
	321	* INFO PART
	322	*/
2af677fc CL	323	static const char *snd_device_type_name(int type)
	324	{
	325	switch (type) {
	326	case SNDRV_DEVICE_TYPE_CONTROL:
	327	return "control";
	328	case SNDRV_DEVICE_TYPE_HWDEP:
	329	return "hardware dependent";
	330	case SNDRV_DEVICE_TYPE_RAWMIDI:
	331	return "raw midi";
	332	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	333	return "digital audio playback";
	334	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	335	return "digital audio capture";
	336	case SNDRV_DEVICE_TYPE_SEQUENCER:
	337	return "sequencer";
	338	case SNDRV_DEVICE_TYPE_TIMER:
	339	return "timer";
	340	default:
	341	return "?";
	342	}
	343	}
	344
512bbd6a	345	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	346	{
6983b724	347	int minor;
512bbd6a	348	struct snd_minor *mptr;
1da177e4	349
1a60d4c5	350	mutex_lock(&sound_mutex);
6983b724 CL	351	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	352	if (!(mptr = snd_minors[minor]))
	353	continue;
	354	if (mptr->card >= 0) {
	355	if (mptr->device >= 0)
d001544d	356	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	357	minor, mptr->card, mptr->device,
	358	snd_device_type_name(mptr->type));
	359	else
d001544d	360	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	361	minor, mptr->card,
	362	snd_device_type_name(mptr->type));
	363	} else
d001544d	364	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	365	snd_device_type_name(mptr->type));
1da177e4	366	}
1a60d4c5	367	mutex_unlock(&sound_mutex);
1da177e4 LT	368	}
	369
	370	int __init snd_minor_info_init(void)
	371	{
512bbd6a	372	struct snd_info_entry *entry;
1da177e4 LT	373
1da177e4 LT	374	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
b591b6e9 TI	375	if (!entry)
	376	return -ENOMEM;
	377	entry->c.text.read = snd_minor_info_read;
	378	return snd_info_register(entry); /* freed in error path */
1da177e4	379	}
cd6a6503	380	#endif /* CONFIG_SND_PROC_FS */
1da177e4 LT	381
	382	/*
	383	* INIT PART
	384	*/
	385
	386	static int __init alsa_sound_init(void)
	387	{
1da177e4 LT	388	snd_major = major;
1da177e4 LT	389	snd_ecards_limit = cards_limit;
1da177e4	390	if (register_chrdev(major, "alsa", &snd_fops)) {
f2f9307a	391	pr_err("ALSA core: unable to register native major device number %d\n", major);
1da177e4 LT	392	return -EIO;
1da177e4 LT	393	}
1da177e4	394	if (snd_info_init() < 0) {
1da177e4	395	unregister_chrdev(major, "alsa");
1da177e4 LT	396	return -ENOMEM;
1da177e4 LT	397	}
1da177e4	398	#ifndef MODULE
f2f9307a	399	pr_info("Advanced Linux Sound Architecture Driver Initialized.\n");
1da177e4 LT	400	#endif
	401	return 0;
	402	}
	403
	404	static void __exit alsa_sound_exit(void)
	405	{
1da177e4	406	snd_info_done();
68fc4fab	407	unregister_chrdev(major, "alsa");
1da177e4 LT	408	}
1da177e4 LT	409
c181a13a TLSC	410	subsys_initcall(alsa_sound_init);
c181a13a TLSC	411	module_exit(alsa_sound_exit);