[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/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>

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:
		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:
		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;
	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(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	36
1da177e4 LT	37	static int major = CONFIG_SND_MAJOR;
1da177e4 LT	38	int snd_major;
c0d3fb39 TI	39	EXPORT_SYMBOL(snd_major);
c0d3fb39 TI	40
1da177e4	41	static int cards_limit = 1;
1da177e4	42
c1017a4c	43	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	44	MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
	45	MODULE_LICENSE("GPL");
	46	module_param(major, int, 0444);
	47	MODULE_PARM_DESC(major, "Major # for sound driver.");
	48	module_param(cards_limit, int, 0444);
	49	MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
1da177e4 LT	50	MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
	51
	52	/* this one holds the actual max. card number currently available.
	53	* as default, it's identical with cards_limit option. when more
	54	* modules are loaded manually, this limit number increases, too.
	55	*/
	56	int snd_ecards_limit;
c0d3fb39	57	EXPORT_SYMBOL(snd_ecards_limit);
1da177e4	58
6983b724	59	static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
1a60d4c5	60	static DEFINE_MUTEX(sound_mutex);
1da177e4	61
ee2da997	62	#ifdef CONFIG_MODULES
1da177e4 LT	63
	64	/**
	65	* snd_request_card - try to load the card module
	66	* @card: the card number
	67	*
	68	* Tries to load the module "snd-card-X" for the given card number
ee2da997	69	* via request_module. Returns immediately if already loaded.
1da177e4 LT	70	*/
	71	void snd_request_card(int card)
	72	{
746df948	73	if (snd_card_locked(card))
1da177e4 LT	74	return;
	75	if (card < 0 \|\| card >= cards_limit)
	76	return;
	77	request_module("snd-card-%i", card);
	78	}
	79
c0d3fb39 TI	80	EXPORT_SYMBOL(snd_request_card);
c0d3fb39 TI	81
1da177e4 LT	82	static void snd_request_other(int minor)
	83	{
	84	char *str;
	85
1da177e4 LT	86	switch (minor) {
	87	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	88	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	89	default: return;
	90	}
	91	request_module(str);
	92	}
	93
ee2da997	94	#endif /* modular kernel */
1da177e4	95
f87135f5 CL	96	/**
	97	* snd_lookup_minor_data - get user data of a registered device
	98	* @minor: the minor number
	99	* @type: device type (SNDRV_DEVICE_TYPE_XXX)
	100	*
	101	* Checks that a minor device with the specified type is registered, and returns
	102	* its user data pointer.
	103	*/
	104	void *snd_lookup_minor_data(unsigned int minor, int type)
	105	{
	106	struct snd_minor *mreg;
	107	void *private_data;
	108
3a63e444	109	if (minor >= ARRAY_SIZE(snd_minors))
f87135f5	110	return NULL;
1a60d4c5	111	mutex_lock(&sound_mutex);
f87135f5 CL	112	mreg = snd_minors[minor];
	113	if (mreg && mreg->type == type)
	114	private_data = mreg->private_data;
	115	else
	116	private_data = NULL;
1a60d4c5	117	mutex_unlock(&sound_mutex);
f87135f5 CL	118	return private_data;
	119	}
	120
c0d3fb39 TI	121	EXPORT_SYMBOL(snd_lookup_minor_data);
c0d3fb39 TI	122
78a3c3d7	123	static int __snd_open(struct inode inode, struct file file)
1da177e4	124	{
332682b1	125	unsigned int minor = iminor(inode);
512bbd6a	126	struct snd_minor *mptr = NULL;
99ac48f5	127	const struct file_operations *old_fops;
1da177e4 LT	128	int err = 0;
1da177e4 LT	129
3a63e444	130	if (minor >= ARRAY_SIZE(snd_minors))
332682b1 CL	131	return -ENODEV;
	132	mptr = snd_minors[minor];
	133	if (mptr == NULL) {
ee2da997	134	#ifdef CONFIG_MODULES
332682b1 CL	135	int dev = SNDRV_MINOR_DEVICE(minor);
	136	if (dev == SNDRV_MINOR_CONTROL) {
	137	/* /dev/aloadC? */
	138	int card = SNDRV_MINOR_CARD(minor);
1da177e4	139	if (snd_cards[card] == NULL)
332682b1 CL	140	snd_request_card(card);
	141	} else if (dev == SNDRV_MINOR_GLOBAL) {
	142	/* /dev/aloadSEQ */
1da177e4	143	snd_request_other(minor);
332682b1 CL	144	}
	145	#ifndef CONFIG_SND_DYNAMIC_MINORS
	146	/* /dev/snd/{controlC?,seq} */
	147	mptr = snd_minors[minor];
	148	if (mptr == NULL)
	149	#endif
1da177e4	150	#endif
332682b1	151	return -ENODEV;
1da177e4	152	}
1da177e4 LT	153	old_fops = file->f_op;
	154	file->f_op = fops_get(mptr->f_ops);
	155	if (file->f_op->open)
	156	err = file->f_op->open(inode, file);
	157	if (err) {
	158	fops_put(file->f_op);
	159	file->f_op = fops_get(old_fops);
	160	}
	161	fops_put(old_fops);
	162	return err;
	163	}
	164
78a3c3d7 JC	165
	166	/* BKL pushdown: nasty #ifdef avoidance wrapper */
	167	static int snd_open(struct inode inode, struct file file)
	168	{
	169	int ret;
	170
	171	lock_kernel();
	172	ret = __snd_open(inode, file);
	173	unlock_kernel();
	174	return ret;
	175	}
	176
9c2e08c5	177	static const struct file_operations snd_fops =
1da177e4 LT	178	{
	179	.owner = THIS_MODULE,
	180	.open = snd_open
	181	};
	182
332682b1 CL	183	#ifdef CONFIG_SND_DYNAMIC_MINORS
	184	static int snd_find_free_minor(void)
	185	{
	186	int minor;
	187
	188	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
	189	/* skip minors still used statically for autoloading devices */
	190	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL \|\|
	191	minor == SNDRV_MINOR_SEQUENCER)
	192	continue;
	193	if (!snd_minors[minor])
	194	return minor;
	195	}
	196	return -EBUSY;
	197	}
	198	#else
512bbd6a	199	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	200	{
	201	int minor;
	202
	203	switch (type) {
	204	case SNDRV_DEVICE_TYPE_SEQUENCER:
	205	case SNDRV_DEVICE_TYPE_TIMER:
	206	minor = type;
	207	break;
	208	case SNDRV_DEVICE_TYPE_CONTROL:
7eaa943c TI	209	if (snd_BUG_ON(!card))
7eaa943c TI	210	return -EINVAL;
1da177e4 LT	211	minor = SNDRV_MINOR(card->number, type);
	212	break;
	213	case SNDRV_DEVICE_TYPE_HWDEP:
	214	case SNDRV_DEVICE_TYPE_RAWMIDI:
	215	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	216	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
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;
1da177e4 LT	226	return minor;
1da177e4 LT	227	}
332682b1	228	#endif
1da177e4 LT	229
1da177e4 LT	230	/**
12b131c4	231	* snd_register_device_for_dev - Register the ALSA device file for the card
1da177e4 LT	232	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	233	* @card: the card instance
	234	* @dev: the device index
2af677fc	235	* @f_ops: the file operations
f87135f5	236	* @private_data: user pointer for f_ops->open()
1da177e4	237	* @name: the device file name
12b131c4	238	* @device: the &struct device to link this new device to
1da177e4 LT	239	*
	240	* Registers an ALSA device file for the given card.
	241	* The operators have to be set in reg parameter.
	242	*
12b131c4	243	* Returns zero if successful, or a negative error code on failure.
1da177e4	244	*/
12b131c4 JB	245	int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
	246	const struct file_operations *f_ops,
	247	void *private_data,
	248	const char name, struct device device)
1da177e4	249	{
332682b1	250	int minor;
512bbd6a	251	struct snd_minor *preg;
1da177e4	252
7eaa943c TI	253	if (snd_BUG_ON(!name))
7eaa943c TI	254	return -EINVAL;
562b590d	255	preg = kmalloc(sizeof *preg, GFP_KERNEL);
1da177e4 LT	256	if (preg == NULL)
1da177e4 LT	257	return -ENOMEM;
2af677fc	258	preg->type = type;
6983b724	259	preg->card = card ? card->number : -1;
1da177e4	260	preg->device = dev;
2af677fc	261	preg->f_ops = f_ops;
f87135f5	262	preg->private_data = private_data;
1a60d4c5	263	mutex_lock(&sound_mutex);
332682b1 CL	264	#ifdef CONFIG_SND_DYNAMIC_MINORS
	265	minor = snd_find_free_minor();
	266	#else
	267	minor = snd_kernel_minor(type, card, dev);
	268	if (minor >= 0 && snd_minors[minor])
	269	minor = -EBUSY;
	270	#endif
	271	if (minor < 0) {
1a60d4c5	272	mutex_unlock(&sound_mutex);
1da177e4	273	kfree(preg);
332682b1	274	return minor;
1da177e4	275	}
6983b724	276	snd_minors[minor] = preg;
abe9ab8f GKH	277	preg->dev = device_create(sound_class, device, MKDEV(major, minor),
abe9ab8f GKH	278	private_data, "%s", name);
2469049e MK	279	if (IS_ERR(preg->dev)) {
	280	snd_minors[minor] = NULL;
	281	mutex_unlock(&sound_mutex);
	282	minor = PTR_ERR(preg->dev);
	283	kfree(preg);
	284	return minor;
	285	}
	286
1a60d4c5	287	mutex_unlock(&sound_mutex);
1da177e4 LT	288	return 0;
	289	}
	290
12b131c4	291	EXPORT_SYMBOL(snd_register_device_for_dev);
c0d3fb39	292
9d19f48c TI	293	/* find the matching minor record
	294	* return the index of snd_minor, or -1 if not found
	295	*/
	296	static int find_snd_minor(int type, struct snd_card *card, int dev)
	297	{
	298	int cardnum, minor;
	299	struct snd_minor *mptr;
	300
	301	cardnum = card ? card->number : -1;
	302	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
	303	if ((mptr = snd_minors[minor]) != NULL &&
	304	mptr->type == type &&
	305	mptr->card == cardnum &&
	306	mptr->device == dev)
	307	return minor;
	308	return -1;
	309	}
	310
1da177e4 LT	311	/**
	312	* snd_unregister_device - unregister the device on the given card
	313	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	314	* @card: the card instance
	315	* @dev: the device index
	316	*
	317	* Unregisters the device file already registered via
	318	* snd_register_device().
	319	*
	320	* Returns zero if sucecessful, or a negative error code on failure
	321	*/
512bbd6a	322	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4	323	{
9d19f48c	324	int minor;
1da177e4	325
1a60d4c5	326	mutex_lock(&sound_mutex);
9d19f48c TI	327	minor = find_snd_minor(type, card, dev);
9d19f48c TI	328	if (minor < 0) {
1a60d4c5	329	mutex_unlock(&sound_mutex);
1da177e4 LT	330	return -EINVAL;
	331	}
	332
d80f19fa	333	device_destroy(sound_class, MKDEV(major, minor));
1da177e4	334
9d19f48c	335	kfree(snd_minors[minor]);
6983b724	336	snd_minors[minor] = NULL;
1a60d4c5	337	mutex_unlock(&sound_mutex);
1da177e4 LT	338	return 0;
	339	}
	340
c0d3fb39 TI	341	EXPORT_SYMBOL(snd_unregister_device);
c0d3fb39 TI	342
9d19f48c	343	int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
d80f19fa	344	struct device_attribute *attr)
9d19f48c TI	345	{
9d19f48c TI	346	int minor, ret = -EINVAL;
d80f19fa	347	struct device *d;
9d19f48c TI	348
	349	mutex_lock(&sound_mutex);
	350	minor = find_snd_minor(type, card, dev);
d80f19fa GKH	351	if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL)
d80f19fa GKH	352	ret = device_create_file(d, attr);
9d19f48c TI	353	mutex_unlock(&sound_mutex);
	354	return ret;
	355
	356	}
	357
	358	EXPORT_SYMBOL(snd_add_device_sysfs_file);
	359
e28563cc	360	#ifdef CONFIG_PROC_FS
1da177e4 LT	361	/*
	362	* INFO PART
	363	*/
	364
6581f4e7	365	static struct snd_info_entry *snd_minor_info_entry;
1da177e4	366
2af677fc CL	367	static const char *snd_device_type_name(int type)
	368	{
	369	switch (type) {
	370	case SNDRV_DEVICE_TYPE_CONTROL:
	371	return "control";
	372	case SNDRV_DEVICE_TYPE_HWDEP:
	373	return "hardware dependent";
	374	case SNDRV_DEVICE_TYPE_RAWMIDI:
	375	return "raw midi";
	376	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	377	return "digital audio playback";
	378	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	379	return "digital audio capture";
	380	case SNDRV_DEVICE_TYPE_SEQUENCER:
	381	return "sequencer";
	382	case SNDRV_DEVICE_TYPE_TIMER:
	383	return "timer";
	384	default:
	385	return "?";
	386	}
	387	}
	388
512bbd6a	389	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	390	{
6983b724	391	int minor;
512bbd6a	392	struct snd_minor *mptr;
1da177e4	393
1a60d4c5	394	mutex_lock(&sound_mutex);
6983b724 CL	395	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	396	if (!(mptr = snd_minors[minor]))
	397	continue;
	398	if (mptr->card >= 0) {
	399	if (mptr->device >= 0)
d001544d	400	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	401	minor, mptr->card, mptr->device,
	402	snd_device_type_name(mptr->type));
	403	else
d001544d	404	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	405	minor, mptr->card,
	406	snd_device_type_name(mptr->type));
	407	} else
d001544d	408	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	409	snd_device_type_name(mptr->type));
1da177e4	410	}
1a60d4c5	411	mutex_unlock(&sound_mutex);
1da177e4 LT	412	}
	413
	414	int __init snd_minor_info_init(void)
	415	{
512bbd6a	416	struct snd_info_entry *entry;
1da177e4 LT	417
	418	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	419	if (entry) {
1da177e4 LT	420	entry->c.text.read = snd_minor_info_read;
	421	if (snd_info_register(entry) < 0) {
	422	snd_info_free_entry(entry);
	423	entry = NULL;
	424	}
	425	}
	426	snd_minor_info_entry = entry;
	427	return 0;
	428	}
	429
	430	int __exit snd_minor_info_done(void)
	431	{
746d4a02	432	snd_info_free_entry(snd_minor_info_entry);
1da177e4 LT	433	return 0;
1da177e4 LT	434	}
e28563cc	435	#endif /* CONFIG_PROC_FS */
1da177e4 LT	436
	437	/*
	438	* INIT PART
	439	*/
	440
	441	static int __init alsa_sound_init(void)
	442	{
1da177e4 LT	443	snd_major = major;
1da177e4 LT	444	snd_ecards_limit = cards_limit;
1da177e4 LT	445	if (register_chrdev(major, "alsa", &snd_fops)) {
1da177e4 LT	446	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
1da177e4 LT	447	return -EIO;
1da177e4 LT	448	}
1da177e4	449	if (snd_info_init() < 0) {
1da177e4	450	unregister_chrdev(major, "alsa");
1da177e4 LT	451	return -ENOMEM;
	452	}
	453	snd_info_minor_register();
1da177e4 LT	454	#ifndef MODULE
	455	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
	456	#endif
	457	return 0;
	458	}
	459
	460	static void __exit alsa_sound_exit(void)
	461	{
1da177e4 LT	462	snd_info_minor_unregister();
1da177e4 LT	463	snd_info_done();
68fc4fab	464	unregister_chrdev(major, "alsa");
1da177e4 LT	465	}
	466
	467	module_init(alsa_sound_init)
	468	module_exit(alsa_sound_exit)