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

/*
 *  Advanced Linux Sound Architecture
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/device.h>
#include <linux/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)
			atomic_inc(&mreg->card_ptr->refcount);
	} 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);
		if (snd_cards[card] == NULL)
			snd_request_card(card);
	} 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)
{
	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_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:
		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;
	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.
 *
 * Return: 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;

	if (snd_BUG_ON(!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;
	preg->card_ptr = card;
	mutex_lock(&sound_mutex);
#ifdef CONFIG_SND_DYNAMIC_MINORS
	minor = snd_find_free_minor(type);
#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),
				  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().
 *
 * Return: Zero if successful, 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 Initialized.\n");
#endif
	return 0;
}

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

subsys_initcall(alsa_sound_init);
module_exit(alsa_sound_exit);
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* Advanced Linux Sound Architecture
c1017a4c	3	* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
1da177e4 LT	4	*
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*
	20	*/
	21
1da177e4 LT	22	#include <linux/init.h>
	23	#include <linux/slab.h>
	24	#include <linux/time.h>
9a1a2a1d	25	#include <linux/device.h>
65a77217	26	#include <linux/module.h>
1da177e4 LT	27	#include <sound/core.h>
	28	#include <sound/minors.h>
	29	#include <sound/info.h>
1da177e4 LT	30	#include <sound/control.h>
	31	#include <sound/initval.h>
	32	#include <linux/kmod.h>
1a60d4c5	33	#include <linux/mutex.h>
1da177e4	34
1da177e4 LT	35	static int major = CONFIG_SND_MAJOR;
1da177e4 LT	36	int snd_major;
c0d3fb39 TI	37	EXPORT_SYMBOL(snd_major);
c0d3fb39 TI	38
1da177e4	39	static int cards_limit = 1;
1da177e4	40
c1017a4c	41	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	42	MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
	43	MODULE_LICENSE("GPL");
	44	module_param(major, int, 0444);
	45	MODULE_PARM_DESC(major, "Major # for sound driver.");
	46	module_param(cards_limit, int, 0444);
	47	MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
1da177e4 LT	48	MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
	49
	50	/* this one holds the actual max. card number currently available.
	51	* as default, it's identical with cards_limit option. when more
	52	* modules are loaded manually, this limit number increases, too.
	53	*/
	54	int snd_ecards_limit;
c0d3fb39	55	EXPORT_SYMBOL(snd_ecards_limit);
1da177e4	56
6983b724	57	static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
1a60d4c5	58	static DEFINE_MUTEX(sound_mutex);
1da177e4	59
ee2da997	60	#ifdef CONFIG_MODULES
1da177e4 LT	61
	62	/**
	63	* snd_request_card - try to load the card module
	64	* @card: the card number
	65	*
	66	* Tries to load the module "snd-card-X" for the given card number
ee2da997	67	* via request_module. Returns immediately if already loaded.
1da177e4 LT	68	*/
	69	void snd_request_card(int card)
	70	{
746df948	71	if (snd_card_locked(card))
1da177e4 LT	72	return;
	73	if (card < 0 \|\| card >= cards_limit)
	74	return;
	75	request_module("snd-card-%i", card);
	76	}
	77
c0d3fb39 TI	78	EXPORT_SYMBOL(snd_request_card);
c0d3fb39 TI	79
1da177e4 LT	80	static void snd_request_other(int minor)
	81	{
	82	char *str;
	83
1da177e4 LT	84	switch (minor) {
	85	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	86	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	87	default: return;
	88	}
	89	request_module(str);
	90	}
	91
ee2da997	92	#endif /* modular kernel */
1da177e4	93
f87135f5 CL	94	/**
	95	* snd_lookup_minor_data - get user data of a registered device
	96	* @minor: the minor number
	97	* @type: device type (SNDRV_DEVICE_TYPE_XXX)
	98	*
	99	* Checks that a minor device with the specified type is registered, and returns
	100	* its user data pointer.
a0830dbd TI	101	*
	102	* This function increments the reference counter of the card instance
	103	* if an associated instance with the given minor number and type is found.
	104	* The caller must call snd_card_unref() appropriately later.
eb7c06e8 YB	105	*
	106	* Return: The user data pointer if the specified device is found. %NULL
	107	* otherwise.
f87135f5 CL	108	*/
	109	void *snd_lookup_minor_data(unsigned int minor, int type)
	110	{
	111	struct snd_minor *mreg;
	112	void *private_data;
	113
3a63e444	114	if (minor >= ARRAY_SIZE(snd_minors))
f87135f5	115	return NULL;
1a60d4c5	116	mutex_lock(&sound_mutex);
f87135f5	117	mreg = snd_minors[minor];
a0830dbd	118	if (mreg && mreg->type == type) {
f87135f5	119	private_data = mreg->private_data;
8bb4d9ce	120	if (private_data && mreg->card_ptr)
a0830dbd TI	121	atomic_inc(&mreg->card_ptr->refcount);
a0830dbd TI	122	} else
f87135f5	123	private_data = NULL;
1a60d4c5	124	mutex_unlock(&sound_mutex);
f87135f5 CL	125	return private_data;
	126	}
	127
c0d3fb39 TI	128	EXPORT_SYMBOL(snd_lookup_minor_data);
c0d3fb39 TI	129
4cf19b84 TI	130	#ifdef CONFIG_MODULES
	131	static struct snd_minor *autoload_device(unsigned int minor)
	132	{
	133	int dev;
	134	mutex_unlock(&sound_mutex); /* release lock temporarily */
	135	dev = SNDRV_MINOR_DEVICE(minor);
	136	if (dev == SNDRV_MINOR_CONTROL) {
	137	/* /dev/aloadC? */
	138	int card = SNDRV_MINOR_CARD(minor);
	139	if (snd_cards[card] == NULL)
	140	snd_request_card(card);
	141	} else if (dev == SNDRV_MINOR_GLOBAL) {
	142	/* /dev/aloadSEQ */
	143	snd_request_other(minor);
	144	}
	145	mutex_lock(&sound_mutex); /* reacuire lock */
	146	return snd_minors[minor];
	147	}
	148	#else /* !CONFIG_MODULES */
	149	#define autoload_device(minor) NULL
	150	#endif /* CONFIG_MODULES */
	151
	152	static int snd_open(struct inode inode, struct file file)
1da177e4	153	{
332682b1	154	unsigned int minor = iminor(inode);
512bbd6a	155	struct snd_minor *mptr = NULL;
e84f9e57	156	const struct file_operations *new_fops;
1da177e4 LT	157	int err = 0;
1da177e4 LT	158
3a63e444	159	if (minor >= ARRAY_SIZE(snd_minors))
332682b1	160	return -ENODEV;
4cf19b84	161	mutex_lock(&sound_mutex);
332682b1 CL	162	mptr = snd_minors[minor];
332682b1 CL	163	if (mptr == NULL) {
4cf19b84 TI	164	mptr = autoload_device(minor);
	165	if (!mptr) {
	166	mutex_unlock(&sound_mutex);
332682b1	167	return -ENODEV;
4cf19b84	168	}
1da177e4	169	}
e84f9e57	170	new_fops = fops_get(mptr->f_ops);
4cf19b84	171	mutex_unlock(&sound_mutex);
e84f9e57 AV	172	if (!new_fops)
	173	return -ENODEV;
	174	replace_fops(file, new_fops);
4cf19b84	175
e84f9e57	176	if (file->f_op->open)
1da177e4	177	err = file->f_op->open(inode, file);
1da177e4 LT	178	return err;
	179	}
	180
9c2e08c5	181	static const struct file_operations snd_fops =
1da177e4 LT	182	{
1da177e4 LT	183	.owner = THIS_MODULE,
6038f373 AB	184	.open = snd_open,
6038f373 AB	185	.llseek = noop_llseek,
1da177e4 LT	186	};
1da177e4 LT	187
332682b1	188	#ifdef CONFIG_SND_DYNAMIC_MINORS
03cfe6f5	189	static int snd_find_free_minor(int type)
332682b1 CL	190	{
	191	int minor;
	192
03cfe6f5 KS	193	/* static minors for module auto loading */
	194	if (type == SNDRV_DEVICE_TYPE_SEQUENCER)
	195	return SNDRV_MINOR_SEQUENCER;
	196	if (type == SNDRV_DEVICE_TYPE_TIMER)
	197	return SNDRV_MINOR_TIMER;
	198
332682b1	199	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
03cfe6f5 KS	200	/* skip static minors still used for module auto loading */
	201	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL)
	202	continue;
	203	if (minor == SNDRV_MINOR_SEQUENCER \|\|
	204	minor == SNDRV_MINOR_TIMER)
332682b1 CL	205	continue;
	206	if (!snd_minors[minor])
	207	return minor;
	208	}
	209	return -EBUSY;
	210	}
	211	#else
512bbd6a	212	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	213	{
	214	int minor;
	215
	216	switch (type) {
	217	case SNDRV_DEVICE_TYPE_SEQUENCER:
	218	case SNDRV_DEVICE_TYPE_TIMER:
	219	minor = type;
	220	break;
	221	case SNDRV_DEVICE_TYPE_CONTROL:
7eaa943c TI	222	if (snd_BUG_ON(!card))
7eaa943c TI	223	return -EINVAL;
1da177e4 LT	224	minor = SNDRV_MINOR(card->number, type);
	225	break;
	226	case SNDRV_DEVICE_TYPE_HWDEP:
	227	case SNDRV_DEVICE_TYPE_RAWMIDI:
	228	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	229	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
3eafc959	230	case SNDRV_DEVICE_TYPE_COMPRESS:
7eaa943c TI	231	if (snd_BUG_ON(!card))
7eaa943c TI	232	return -EINVAL;
1da177e4 LT	233	minor = SNDRV_MINOR(card->number, type + dev);
	234	break;
	235	default:
	236	return -EINVAL;
	237	}
7eaa943c TI	238	if (snd_BUG_ON(minor < 0 \|\| minor >= SNDRV_OS_MINORS))
7eaa943c TI	239	return -EINVAL;
1da177e4 LT	240	return minor;
1da177e4 LT	241	}
332682b1	242	#endif
1da177e4 LT	243
1da177e4 LT	244	/**
12b131c4	245	* snd_register_device_for_dev - Register the ALSA device file for the card
1da177e4 LT	246	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	247	* @card: the card instance
	248	* @dev: the device index
2af677fc	249	* @f_ops: the file operations
f87135f5	250	* @private_data: user pointer for f_ops->open()
1da177e4	251	* @name: the device file name
12b131c4	252	* @device: the &struct device to link this new device to
1da177e4 LT	253	*
	254	* Registers an ALSA device file for the given card.
	255	* The operators have to be set in reg parameter.
	256	*
eb7c06e8	257	* Return: Zero if successful, or a negative error code on failure.
1da177e4	258	*/
12b131c4 JB	259	int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
	260	const struct file_operations *f_ops,
	261	void *private_data,
	262	const char name, struct device device)
1da177e4	263	{
332682b1	264	int minor;
512bbd6a	265	struct snd_minor *preg;
1da177e4	266
7eaa943c TI	267	if (snd_BUG_ON(!name))
7eaa943c TI	268	return -EINVAL;
562b590d	269	preg = kmalloc(sizeof *preg, GFP_KERNEL);
1da177e4 LT	270	if (preg == NULL)
1da177e4 LT	271	return -ENOMEM;
2af677fc	272	preg->type = type;
6983b724	273	preg->card = card ? card->number : -1;
1da177e4	274	preg->device = dev;
2af677fc	275	preg->f_ops = f_ops;
f87135f5	276	preg->private_data = private_data;
a0830dbd	277	preg->card_ptr = card;
1a60d4c5	278	mutex_lock(&sound_mutex);
332682b1	279	#ifdef CONFIG_SND_DYNAMIC_MINORS
03cfe6f5	280	minor = snd_find_free_minor(type);
332682b1 CL	281	#else
	282	minor = snd_kernel_minor(type, card, dev);
	283	if (minor >= 0 && snd_minors[minor])
	284	minor = -EBUSY;
	285	#endif
	286	if (minor < 0) {
1a60d4c5	287	mutex_unlock(&sound_mutex);
1da177e4	288	kfree(preg);
332682b1	289	return minor;
1da177e4	290	}
6983b724	291	snd_minors[minor] = preg;
abe9ab8f GKH	292	preg->dev = device_create(sound_class, device, MKDEV(major, minor),
abe9ab8f GKH	293	private_data, "%s", name);
2469049e MK	294	if (IS_ERR(preg->dev)) {
	295	snd_minors[minor] = NULL;
	296	mutex_unlock(&sound_mutex);
	297	minor = PTR_ERR(preg->dev);
	298	kfree(preg);
	299	return minor;
	300	}
	301
1a60d4c5	302	mutex_unlock(&sound_mutex);
1da177e4 LT	303	return 0;
	304	}
	305
12b131c4	306	EXPORT_SYMBOL(snd_register_device_for_dev);
c0d3fb39	307
9d19f48c TI	308	/* find the matching minor record
	309	* return the index of snd_minor, or -1 if not found
	310	*/
	311	static int find_snd_minor(int type, struct snd_card *card, int dev)
	312	{
	313	int cardnum, minor;
	314	struct snd_minor *mptr;
	315
	316	cardnum = card ? card->number : -1;
	317	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
	318	if ((mptr = snd_minors[minor]) != NULL &&
	319	mptr->type == type &&
	320	mptr->card == cardnum &&
	321	mptr->device == dev)
	322	return minor;
	323	return -1;
	324	}
	325
1da177e4 LT	326	/**
	327	* snd_unregister_device - unregister the device on the given card
	328	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	329	* @card: the card instance
	330	* @dev: the device index
	331	*
	332	* Unregisters the device file already registered via
	333	* snd_register_device().
	334	*
eb7c06e8	335	* Return: Zero if successful, or a negative error code on failure.
1da177e4	336	*/
512bbd6a	337	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4	338	{
9d19f48c	339	int minor;
1da177e4	340
1a60d4c5	341	mutex_lock(&sound_mutex);
9d19f48c TI	342	minor = find_snd_minor(type, card, dev);
9d19f48c TI	343	if (minor < 0) {
1a60d4c5	344	mutex_unlock(&sound_mutex);
1da177e4 LT	345	return -EINVAL;
	346	}
	347
d80f19fa	348	device_destroy(sound_class, MKDEV(major, minor));
1da177e4	349
9d19f48c	350	kfree(snd_minors[minor]);
6983b724	351	snd_minors[minor] = NULL;
1a60d4c5	352	mutex_unlock(&sound_mutex);
1da177e4 LT	353	return 0;
	354	}
	355
c0d3fb39 TI	356	EXPORT_SYMBOL(snd_unregister_device);
c0d3fb39 TI	357
9d19f48c	358	int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
d80f19fa	359	struct device_attribute *attr)
9d19f48c TI	360	{
9d19f48c TI	361	int minor, ret = -EINVAL;
d80f19fa	362	struct device *d;
9d19f48c TI	363
	364	mutex_lock(&sound_mutex);
	365	minor = find_snd_minor(type, card, dev);
d80f19fa GKH	366	if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL)
d80f19fa GKH	367	ret = device_create_file(d, attr);
9d19f48c TI	368	mutex_unlock(&sound_mutex);
	369	return ret;
	370
	371	}
	372
	373	EXPORT_SYMBOL(snd_add_device_sysfs_file);
	374
e28563cc	375	#ifdef CONFIG_PROC_FS
1da177e4 LT	376	/*
	377	* INFO PART
	378	*/
	379
6581f4e7	380	static struct snd_info_entry *snd_minor_info_entry;
1da177e4	381
2af677fc CL	382	static const char *snd_device_type_name(int type)
	383	{
	384	switch (type) {
	385	case SNDRV_DEVICE_TYPE_CONTROL:
	386	return "control";
	387	case SNDRV_DEVICE_TYPE_HWDEP:
	388	return "hardware dependent";
	389	case SNDRV_DEVICE_TYPE_RAWMIDI:
	390	return "raw midi";
	391	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	392	return "digital audio playback";
	393	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	394	return "digital audio capture";
	395	case SNDRV_DEVICE_TYPE_SEQUENCER:
	396	return "sequencer";
	397	case SNDRV_DEVICE_TYPE_TIMER:
	398	return "timer";
	399	default:
	400	return "?";
	401	}
	402	}
	403
512bbd6a	404	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	405	{
6983b724	406	int minor;
512bbd6a	407	struct snd_minor *mptr;
1da177e4	408
1a60d4c5	409	mutex_lock(&sound_mutex);
6983b724 CL	410	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	411	if (!(mptr = snd_minors[minor]))
	412	continue;
	413	if (mptr->card >= 0) {
	414	if (mptr->device >= 0)
d001544d	415	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	416	minor, mptr->card, mptr->device,
	417	snd_device_type_name(mptr->type));
	418	else
d001544d	419	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	420	minor, mptr->card,
	421	snd_device_type_name(mptr->type));
	422	} else
d001544d	423	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	424	snd_device_type_name(mptr->type));
1da177e4	425	}
1a60d4c5	426	mutex_unlock(&sound_mutex);
1da177e4 LT	427	}
	428
	429	int __init snd_minor_info_init(void)
	430	{
512bbd6a	431	struct snd_info_entry *entry;
1da177e4 LT	432
	433	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	434	if (entry) {
1da177e4 LT	435	entry->c.text.read = snd_minor_info_read;
	436	if (snd_info_register(entry) < 0) {
	437	snd_info_free_entry(entry);
	438	entry = NULL;
	439	}
	440	}
	441	snd_minor_info_entry = entry;
	442	return 0;
	443	}
	444
	445	int __exit snd_minor_info_done(void)
	446	{
746d4a02	447	snd_info_free_entry(snd_minor_info_entry);
1da177e4 LT	448	return 0;
1da177e4 LT	449	}
e28563cc	450	#endif /* CONFIG_PROC_FS */
1da177e4 LT	451
	452	/*
	453	* INIT PART
	454	*/
	455
	456	static int __init alsa_sound_init(void)
	457	{
1da177e4 LT	458	snd_major = major;
1da177e4 LT	459	snd_ecards_limit = cards_limit;
1da177e4 LT	460	if (register_chrdev(major, "alsa", &snd_fops)) {
1da177e4 LT	461	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
1da177e4 LT	462	return -EIO;
1da177e4 LT	463	}
1da177e4	464	if (snd_info_init() < 0) {
1da177e4	465	unregister_chrdev(major, "alsa");
1da177e4 LT	466	return -ENOMEM;
	467	}
	468	snd_info_minor_register();
1da177e4	469	#ifndef MODULE
42662748	470	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Initialized.\n");
1da177e4 LT	471	#endif
	472	return 0;
	473	}
	474
	475	static void __exit alsa_sound_exit(void)
	476	{
1da177e4 LT	477	snd_info_minor_unregister();
1da177e4 LT	478	snd_info_done();
68fc4fab	479	unregister_chrdev(major, "alsa");
1da177e4 LT	480	}
1da177e4 LT	481
c181a13a TLSC	482	subsys_initcall(alsa_sound_init);
c181a13a TLSC	483	module_exit(alsa_sound_exit);