[deliverable/linux.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.
 */
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 *old_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;
		}
	}
	old_fops = file->f_op;
	file->f_op = fops_get(mptr->f_ops);
	if (file->f_op == NULL) {
		file->f_op = old_fops;
		err = -ENODEV;
	}
	mutex_unlock(&sound_mutex);
	if (err < 0)
		return err;

	if (file->f_op->open) {
		err = file->f_op->open(inode, file);
		if (err) {
			fops_put(file->f_op);
			file->f_op = fops_get(old_fops);
		}
	}
	fops_put(old_fops);
	return err;
}

static const struct file_operations snd_fops =
{
	.owner =	THIS_MODULE,
	.open =		snd_open,
	.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.
 *
 * 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;

	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().
 *
 * 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 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.
f87135f5 CL	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	114	mreg = snd_minors[minor];
a0830dbd	115	if (mreg && mreg->type == type) {
f87135f5	116	private_data = mreg->private_data;
8bb4d9ce	117	if (private_data && mreg->card_ptr)
a0830dbd TI	118	atomic_inc(&mreg->card_ptr->refcount);
a0830dbd TI	119	} else
f87135f5	120	private_data = NULL;
1a60d4c5	121	mutex_unlock(&sound_mutex);
f87135f5 CL	122	return private_data;
	123	}
	124
c0d3fb39 TI	125	EXPORT_SYMBOL(snd_lookup_minor_data);
c0d3fb39 TI	126
4cf19b84 TI	127	#ifdef CONFIG_MODULES
	128	static struct snd_minor *autoload_device(unsigned int minor)
	129	{
	130	int dev;
	131	mutex_unlock(&sound_mutex); /* release lock temporarily */
	132	dev = SNDRV_MINOR_DEVICE(minor);
	133	if (dev == SNDRV_MINOR_CONTROL) {
	134	/* /dev/aloadC? */
	135	int card = SNDRV_MINOR_CARD(minor);
	136	if (snd_cards[card] == NULL)
	137	snd_request_card(card);
	138	} else if (dev == SNDRV_MINOR_GLOBAL) {
	139	/* /dev/aloadSEQ */
	140	snd_request_other(minor);
	141	}
	142	mutex_lock(&sound_mutex); /* reacuire lock */
	143	return snd_minors[minor];
	144	}
	145	#else /* !CONFIG_MODULES */
	146	#define autoload_device(minor) NULL
	147	#endif /* CONFIG_MODULES */
	148
	149	static int snd_open(struct inode inode, struct file file)
1da177e4	150	{
332682b1	151	unsigned int minor = iminor(inode);
512bbd6a	152	struct snd_minor *mptr = NULL;
99ac48f5	153	const struct file_operations *old_fops;
1da177e4 LT	154	int err = 0;
1da177e4 LT	155
3a63e444	156	if (minor >= ARRAY_SIZE(snd_minors))
332682b1	157	return -ENODEV;
4cf19b84	158	mutex_lock(&sound_mutex);
332682b1 CL	159	mptr = snd_minors[minor];
332682b1 CL	160	if (mptr == NULL) {
4cf19b84 TI	161	mptr = autoload_device(minor);
	162	if (!mptr) {
	163	mutex_unlock(&sound_mutex);
332682b1	164	return -ENODEV;
4cf19b84	165	}
1da177e4	166	}
1da177e4 LT	167	old_fops = file->f_op;
1da177e4 LT	168	file->f_op = fops_get(mptr->f_ops);
f41ced8f LP	169	if (file->f_op == NULL) {
f41ced8f LP	170	file->f_op = old_fops;
4cf19b84	171	err = -ENODEV;
f41ced8f	172	}
4cf19b84 TI	173	mutex_unlock(&sound_mutex);
	174	if (err < 0)
	175	return err;
	176
	177	if (file->f_op->open) {
1da177e4	178	err = file->f_op->open(inode, file);
4cf19b84 TI	179	if (err) {
	180	fops_put(file->f_op);
	181	file->f_op = fops_get(old_fops);
	182	}
1da177e4 LT	183	}
	184	fops_put(old_fops);
	185	return err;
	186	}
	187
9c2e08c5	188	static const struct file_operations snd_fops =
1da177e4 LT	189	{
1da177e4 LT	190	.owner = THIS_MODULE,
6038f373 AB	191	.open = snd_open,
6038f373 AB	192	.llseek = noop_llseek,
1da177e4 LT	193	};
1da177e4 LT	194
332682b1	195	#ifdef CONFIG_SND_DYNAMIC_MINORS
03cfe6f5	196	static int snd_find_free_minor(int type)
332682b1 CL	197	{
	198	int minor;
	199
03cfe6f5 KS	200	/* static minors for module auto loading */
	201	if (type == SNDRV_DEVICE_TYPE_SEQUENCER)
	202	return SNDRV_MINOR_SEQUENCER;
	203	if (type == SNDRV_DEVICE_TYPE_TIMER)
	204	return SNDRV_MINOR_TIMER;
	205
332682b1	206	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
03cfe6f5 KS	207	/* skip static minors still used for module auto loading */
	208	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL)
	209	continue;
	210	if (minor == SNDRV_MINOR_SEQUENCER \|\|
	211	minor == SNDRV_MINOR_TIMER)
332682b1 CL	212	continue;
	213	if (!snd_minors[minor])
	214	return minor;
	215	}
	216	return -EBUSY;
	217	}
	218	#else
512bbd6a	219	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	220	{
	221	int minor;
	222
	223	switch (type) {
	224	case SNDRV_DEVICE_TYPE_SEQUENCER:
	225	case SNDRV_DEVICE_TYPE_TIMER:
	226	minor = type;
	227	break;
	228	case SNDRV_DEVICE_TYPE_CONTROL:
7eaa943c TI	229	if (snd_BUG_ON(!card))
7eaa943c TI	230	return -EINVAL;
1da177e4 LT	231	minor = SNDRV_MINOR(card->number, type);
	232	break;
	233	case SNDRV_DEVICE_TYPE_HWDEP:
	234	case SNDRV_DEVICE_TYPE_RAWMIDI:
	235	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	236	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
3eafc959	237	case SNDRV_DEVICE_TYPE_COMPRESS:
7eaa943c TI	238	if (snd_BUG_ON(!card))
7eaa943c TI	239	return -EINVAL;
1da177e4 LT	240	minor = SNDRV_MINOR(card->number, type + dev);
	241	break;
	242	default:
	243	return -EINVAL;
	244	}
7eaa943c TI	245	if (snd_BUG_ON(minor < 0 \|\| minor >= SNDRV_OS_MINORS))
7eaa943c TI	246	return -EINVAL;
1da177e4 LT	247	return minor;
1da177e4 LT	248	}
332682b1	249	#endif
1da177e4 LT	250
1da177e4 LT	251	/**
12b131c4	252	* snd_register_device_for_dev - Register the ALSA device file for the card
1da177e4 LT	253	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	254	* @card: the card instance
	255	* @dev: the device index
2af677fc	256	* @f_ops: the file operations
f87135f5	257	* @private_data: user pointer for f_ops->open()
1da177e4	258	* @name: the device file name
12b131c4	259	* @device: the &struct device to link this new device to
1da177e4 LT	260	*
	261	* Registers an ALSA device file for the given card.
	262	* The operators have to be set in reg parameter.
	263	*
12b131c4	264	* Returns zero if successful, or a negative error code on failure.
1da177e4	265	*/
12b131c4 JB	266	int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
	267	const struct file_operations *f_ops,
	268	void *private_data,
	269	const char name, struct device device)
1da177e4	270	{
332682b1	271	int minor;
512bbd6a	272	struct snd_minor *preg;
1da177e4	273
7eaa943c TI	274	if (snd_BUG_ON(!name))
7eaa943c TI	275	return -EINVAL;
562b590d	276	preg = kmalloc(sizeof *preg, GFP_KERNEL);
1da177e4 LT	277	if (preg == NULL)
1da177e4 LT	278	return -ENOMEM;
2af677fc	279	preg->type = type;
6983b724	280	preg->card = card ? card->number : -1;
1da177e4	281	preg->device = dev;
2af677fc	282	preg->f_ops = f_ops;
f87135f5	283	preg->private_data = private_data;
a0830dbd	284	preg->card_ptr = card;
1a60d4c5	285	mutex_lock(&sound_mutex);
332682b1	286	#ifdef CONFIG_SND_DYNAMIC_MINORS
03cfe6f5	287	minor = snd_find_free_minor(type);
332682b1 CL	288	#else
	289	minor = snd_kernel_minor(type, card, dev);
	290	if (minor >= 0 && snd_minors[minor])
	291	minor = -EBUSY;
	292	#endif
	293	if (minor < 0) {
1a60d4c5	294	mutex_unlock(&sound_mutex);
1da177e4	295	kfree(preg);
332682b1	296	return minor;
1da177e4	297	}
6983b724	298	snd_minors[minor] = preg;
abe9ab8f GKH	299	preg->dev = device_create(sound_class, device, MKDEV(major, minor),
abe9ab8f GKH	300	private_data, "%s", name);
2469049e MK	301	if (IS_ERR(preg->dev)) {
	302	snd_minors[minor] = NULL;
	303	mutex_unlock(&sound_mutex);
	304	minor = PTR_ERR(preg->dev);
	305	kfree(preg);
	306	return minor;
	307	}
	308
1a60d4c5	309	mutex_unlock(&sound_mutex);
1da177e4 LT	310	return 0;
	311	}
	312
12b131c4	313	EXPORT_SYMBOL(snd_register_device_for_dev);
c0d3fb39	314
9d19f48c TI	315	/* find the matching minor record
	316	* return the index of snd_minor, or -1 if not found
	317	*/
	318	static int find_snd_minor(int type, struct snd_card *card, int dev)
	319	{
	320	int cardnum, minor;
	321	struct snd_minor *mptr;
	322
	323	cardnum = card ? card->number : -1;
	324	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
	325	if ((mptr = snd_minors[minor]) != NULL &&
	326	mptr->type == type &&
	327	mptr->card == cardnum &&
	328	mptr->device == dev)
	329	return minor;
	330	return -1;
	331	}
	332
1da177e4 LT	333	/**
	334	* snd_unregister_device - unregister the device on the given card
	335	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	336	* @card: the card instance
	337	* @dev: the device index
	338	*
	339	* Unregisters the device file already registered via
	340	* snd_register_device().
	341	*
	342	* Returns zero if sucecessful, or a negative error code on failure
	343	*/
512bbd6a	344	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4	345	{
9d19f48c	346	int minor;
1da177e4	347
1a60d4c5	348	mutex_lock(&sound_mutex);
9d19f48c TI	349	minor = find_snd_minor(type, card, dev);
9d19f48c TI	350	if (minor < 0) {
1a60d4c5	351	mutex_unlock(&sound_mutex);
1da177e4 LT	352	return -EINVAL;
	353	}
	354
d80f19fa	355	device_destroy(sound_class, MKDEV(major, minor));
1da177e4	356
9d19f48c	357	kfree(snd_minors[minor]);
6983b724	358	snd_minors[minor] = NULL;
1a60d4c5	359	mutex_unlock(&sound_mutex);
1da177e4 LT	360	return 0;
	361	}
	362
c0d3fb39 TI	363	EXPORT_SYMBOL(snd_unregister_device);
c0d3fb39 TI	364
9d19f48c	365	int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
d80f19fa	366	struct device_attribute *attr)
9d19f48c TI	367	{
9d19f48c TI	368	int minor, ret = -EINVAL;
d80f19fa	369	struct device *d;
9d19f48c TI	370
	371	mutex_lock(&sound_mutex);
	372	minor = find_snd_minor(type, card, dev);
d80f19fa GKH	373	if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL)
d80f19fa GKH	374	ret = device_create_file(d, attr);
9d19f48c TI	375	mutex_unlock(&sound_mutex);
	376	return ret;
	377
	378	}
	379
	380	EXPORT_SYMBOL(snd_add_device_sysfs_file);
	381
e28563cc	382	#ifdef CONFIG_PROC_FS
1da177e4 LT	383	/*
	384	* INFO PART
	385	*/
	386
6581f4e7	387	static struct snd_info_entry *snd_minor_info_entry;
1da177e4	388
2af677fc CL	389	static const char *snd_device_type_name(int type)
	390	{
	391	switch (type) {
	392	case SNDRV_DEVICE_TYPE_CONTROL:
	393	return "control";
	394	case SNDRV_DEVICE_TYPE_HWDEP:
	395	return "hardware dependent";
	396	case SNDRV_DEVICE_TYPE_RAWMIDI:
	397	return "raw midi";
	398	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	399	return "digital audio playback";
	400	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	401	return "digital audio capture";
	402	case SNDRV_DEVICE_TYPE_SEQUENCER:
	403	return "sequencer";
	404	case SNDRV_DEVICE_TYPE_TIMER:
	405	return "timer";
	406	default:
	407	return "?";
	408	}
	409	}
	410
512bbd6a	411	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	412	{
6983b724	413	int minor;
512bbd6a	414	struct snd_minor *mptr;
1da177e4	415
1a60d4c5	416	mutex_lock(&sound_mutex);
6983b724 CL	417	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	418	if (!(mptr = snd_minors[minor]))
	419	continue;
	420	if (mptr->card >= 0) {
	421	if (mptr->device >= 0)
d001544d	422	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	423	minor, mptr->card, mptr->device,
	424	snd_device_type_name(mptr->type));
	425	else
d001544d	426	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	427	minor, mptr->card,
	428	snd_device_type_name(mptr->type));
	429	} else
d001544d	430	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	431	snd_device_type_name(mptr->type));
1da177e4	432	}
1a60d4c5	433	mutex_unlock(&sound_mutex);
1da177e4 LT	434	}
	435
	436	int __init snd_minor_info_init(void)
	437	{
512bbd6a	438	struct snd_info_entry *entry;
1da177e4 LT	439
	440	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	441	if (entry) {
1da177e4 LT	442	entry->c.text.read = snd_minor_info_read;
	443	if (snd_info_register(entry) < 0) {
	444	snd_info_free_entry(entry);
	445	entry = NULL;
	446	}
	447	}
	448	snd_minor_info_entry = entry;
	449	return 0;
	450	}
	451
	452	int __exit snd_minor_info_done(void)
	453	{
746d4a02	454	snd_info_free_entry(snd_minor_info_entry);
1da177e4 LT	455	return 0;
1da177e4 LT	456	}
e28563cc	457	#endif /* CONFIG_PROC_FS */
1da177e4 LT	458
	459	/*
	460	* INIT PART
	461	*/
	462
	463	static int __init alsa_sound_init(void)
	464	{
1da177e4 LT	465	snd_major = major;
1da177e4 LT	466	snd_ecards_limit = cards_limit;
1da177e4 LT	467	if (register_chrdev(major, "alsa", &snd_fops)) {
1da177e4 LT	468	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
1da177e4 LT	469	return -EIO;
1da177e4 LT	470	}
1da177e4	471	if (snd_info_init() < 0) {
1da177e4	472	unregister_chrdev(major, "alsa");
1da177e4 LT	473	return -ENOMEM;
	474	}
	475	snd_info_minor_register();
1da177e4	476	#ifndef MODULE
42662748	477	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Initialized.\n");
1da177e4 LT	478	#endif
	479	return 0;
	480	}
	481
	482	static void __exit alsa_sound_exit(void)
	483	{
1da177e4 LT	484	snd_info_minor_unregister();
1da177e4 LT	485	snd_info_done();
68fc4fab	486	unregister_chrdev(major, "alsa");
1da177e4 LT	487	}
1da177e4 LT	488
c181a13a TLSC	489	subsys_initcall(alsa_sound_init);
c181a13a TLSC	490	module_exit(alsa_sound_exit);