[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/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);

#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(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");
}

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>
1da177e4 LT	26	#include <linux/moduleparam.h>
	27	#include <sound/core.h>
	28	#include <sound/minors.h>
	29	#include <sound/info.h>
	30	#include <sound/version.h>
	31	#include <sound/control.h>
	32	#include <sound/initval.h>
	33	#include <linux/kmod.h>
1a60d4c5	34	#include <linux/mutex.h>
1da177e4	35
1da177e4 LT	36	static int major = CONFIG_SND_MAJOR;
1da177e4 LT	37	int snd_major;
c0d3fb39 TI	38	EXPORT_SYMBOL(snd_major);
c0d3fb39 TI	39
1da177e4	40	static int cards_limit = 1;
1da177e4	41
c1017a4c	42	MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
1da177e4 LT	43	MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
	44	MODULE_LICENSE("GPL");
	45	module_param(major, int, 0444);
	46	MODULE_PARM_DESC(major, "Major # for sound driver.");
	47	module_param(cards_limit, int, 0444);
	48	MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
1da177e4 LT	49	MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
	50
	51	/* this one holds the actual max. card number currently available.
	52	* as default, it's identical with cards_limit option. when more
	53	* modules are loaded manually, this limit number increases, too.
	54	*/
	55	int snd_ecards_limit;
c0d3fb39	56	EXPORT_SYMBOL(snd_ecards_limit);
1da177e4	57
6983b724	58	static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
1a60d4c5	59	static DEFINE_MUTEX(sound_mutex);
1da177e4	60
ee2da997	61	#ifdef CONFIG_MODULES
1da177e4 LT	62
	63	/**
	64	* snd_request_card - try to load the card module
	65	* @card: the card number
	66	*
	67	* Tries to load the module "snd-card-X" for the given card number
ee2da997	68	* via request_module. Returns immediately if already loaded.
1da177e4 LT	69	*/
	70	void snd_request_card(int card)
	71	{
746df948	72	if (snd_card_locked(card))
1da177e4 LT	73	return;
	74	if (card < 0 \|\| card >= cards_limit)
	75	return;
	76	request_module("snd-card-%i", card);
	77	}
	78
c0d3fb39 TI	79	EXPORT_SYMBOL(snd_request_card);
c0d3fb39 TI	80
1da177e4 LT	81	static void snd_request_other(int minor)
	82	{
	83	char *str;
	84
1da177e4 LT	85	switch (minor) {
	86	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	87	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	88	default: return;
	89	}
	90	request_module(str);
	91	}
	92
ee2da997	93	#endif /* modular kernel */
1da177e4	94
f87135f5 CL	95	/**
	96	* snd_lookup_minor_data - get user data of a registered device
	97	* @minor: the minor number
	98	* @type: device type (SNDRV_DEVICE_TYPE_XXX)
	99	*
	100	* Checks that a minor device with the specified type is registered, and returns
	101	* its user data pointer.
	102	*/
	103	void *snd_lookup_minor_data(unsigned int minor, int type)
	104	{
	105	struct snd_minor *mreg;
	106	void *private_data;
	107
3a63e444	108	if (minor >= ARRAY_SIZE(snd_minors))
f87135f5	109	return NULL;
1a60d4c5	110	mutex_lock(&sound_mutex);
f87135f5 CL	111	mreg = snd_minors[minor];
	112	if (mreg && mreg->type == type)
	113	private_data = mreg->private_data;
	114	else
	115	private_data = NULL;
1a60d4c5	116	mutex_unlock(&sound_mutex);
f87135f5 CL	117	return private_data;
	118	}
	119
c0d3fb39 TI	120	EXPORT_SYMBOL(snd_lookup_minor_data);
c0d3fb39 TI	121
4cf19b84 TI	122	#ifdef CONFIG_MODULES
	123	static struct snd_minor *autoload_device(unsigned int minor)
	124	{
	125	int dev;
	126	mutex_unlock(&sound_mutex); /* release lock temporarily */
	127	dev = SNDRV_MINOR_DEVICE(minor);
	128	if (dev == SNDRV_MINOR_CONTROL) {
	129	/* /dev/aloadC? */
	130	int card = SNDRV_MINOR_CARD(minor);
	131	if (snd_cards[card] == NULL)
	132	snd_request_card(card);
	133	} else if (dev == SNDRV_MINOR_GLOBAL) {
	134	/* /dev/aloadSEQ */
	135	snd_request_other(minor);
	136	}
	137	mutex_lock(&sound_mutex); /* reacuire lock */
	138	return snd_minors[minor];
	139	}
	140	#else /* !CONFIG_MODULES */
	141	#define autoload_device(minor) NULL
	142	#endif /* CONFIG_MODULES */
	143
	144	static int snd_open(struct inode inode, struct file file)
1da177e4	145	{
332682b1	146	unsigned int minor = iminor(inode);
512bbd6a	147	struct snd_minor *mptr = NULL;
99ac48f5	148	const struct file_operations *old_fops;
1da177e4 LT	149	int err = 0;
1da177e4 LT	150
3a63e444	151	if (minor >= ARRAY_SIZE(snd_minors))
332682b1	152	return -ENODEV;
4cf19b84	153	mutex_lock(&sound_mutex);
332682b1 CL	154	mptr = snd_minors[minor];
332682b1 CL	155	if (mptr == NULL) {
4cf19b84 TI	156	mptr = autoload_device(minor);
	157	if (!mptr) {
	158	mutex_unlock(&sound_mutex);
332682b1	159	return -ENODEV;
4cf19b84	160	}
1da177e4	161	}
1da177e4 LT	162	old_fops = file->f_op;
1da177e4 LT	163	file->f_op = fops_get(mptr->f_ops);
f41ced8f LP	164	if (file->f_op == NULL) {
f41ced8f LP	165	file->f_op = old_fops;
4cf19b84	166	err = -ENODEV;
f41ced8f	167	}
4cf19b84 TI	168	mutex_unlock(&sound_mutex);
	169	if (err < 0)
	170	return err;
	171
	172	if (file->f_op->open) {
1da177e4	173	err = file->f_op->open(inode, file);
4cf19b84 TI	174	if (err) {
	175	fops_put(file->f_op);
	176	file->f_op = fops_get(old_fops);
	177	}
1da177e4 LT	178	}
	179	fops_put(old_fops);
	180	return err;
	181	}
	182
9c2e08c5	183	static const struct file_operations snd_fops =
1da177e4 LT	184	{
1da177e4 LT	185	.owner = THIS_MODULE,
6038f373 AB	186	.open = snd_open,
6038f373 AB	187	.llseek = noop_llseek,
1da177e4 LT	188	};
1da177e4 LT	189
332682b1 CL	190	#ifdef CONFIG_SND_DYNAMIC_MINORS
	191	static int snd_find_free_minor(void)
	192	{
	193	int minor;
	194
	195	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
	196	/* skip minors still used statically for autoloading devices */
	197	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL \|\|
	198	minor == SNDRV_MINOR_SEQUENCER)
	199	continue;
	200	if (!snd_minors[minor])
	201	return minor;
	202	}
	203	return -EBUSY;
	204	}
	205	#else
512bbd6a	206	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	207	{
	208	int minor;
	209
	210	switch (type) {
	211	case SNDRV_DEVICE_TYPE_SEQUENCER:
	212	case SNDRV_DEVICE_TYPE_TIMER:
	213	minor = type;
	214	break;
	215	case SNDRV_DEVICE_TYPE_CONTROL:
7eaa943c TI	216	if (snd_BUG_ON(!card))
7eaa943c TI	217	return -EINVAL;
1da177e4 LT	218	minor = SNDRV_MINOR(card->number, type);
	219	break;
	220	case SNDRV_DEVICE_TYPE_HWDEP:
	221	case SNDRV_DEVICE_TYPE_RAWMIDI:
	222	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	223	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
7eaa943c TI	224	if (snd_BUG_ON(!card))
7eaa943c TI	225	return -EINVAL;
1da177e4 LT	226	minor = SNDRV_MINOR(card->number, type + dev);
	227	break;
	228	default:
	229	return -EINVAL;
	230	}
7eaa943c TI	231	if (snd_BUG_ON(minor < 0 \|\| minor >= SNDRV_OS_MINORS))
7eaa943c TI	232	return -EINVAL;
1da177e4 LT	233	return minor;
1da177e4 LT	234	}
332682b1	235	#endif
1da177e4 LT	236
1da177e4 LT	237	/**
12b131c4	238	* snd_register_device_for_dev - Register the ALSA device file for the card
1da177e4 LT	239	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	240	* @card: the card instance
	241	* @dev: the device index
2af677fc	242	* @f_ops: the file operations
f87135f5	243	* @private_data: user pointer for f_ops->open()
1da177e4	244	* @name: the device file name
12b131c4	245	* @device: the &struct device to link this new device to
1da177e4 LT	246	*
	247	* Registers an ALSA device file for the given card.
	248	* The operators have to be set in reg parameter.
	249	*
12b131c4	250	* Returns zero if successful, or a negative error code on failure.
1da177e4	251	*/
12b131c4 JB	252	int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
	253	const struct file_operations *f_ops,
	254	void *private_data,
	255	const char name, struct device device)
1da177e4	256	{
332682b1	257	int minor;
512bbd6a	258	struct snd_minor *preg;
1da177e4	259
7eaa943c TI	260	if (snd_BUG_ON(!name))
7eaa943c TI	261	return -EINVAL;
562b590d	262	preg = kmalloc(sizeof *preg, GFP_KERNEL);
1da177e4 LT	263	if (preg == NULL)
1da177e4 LT	264	return -ENOMEM;
2af677fc	265	preg->type = type;
6983b724	266	preg->card = card ? card->number : -1;
1da177e4	267	preg->device = dev;
2af677fc	268	preg->f_ops = f_ops;
f87135f5	269	preg->private_data = private_data;
1a60d4c5	270	mutex_lock(&sound_mutex);
332682b1 CL	271	#ifdef CONFIG_SND_DYNAMIC_MINORS
	272	minor = snd_find_free_minor();
	273	#else
	274	minor = snd_kernel_minor(type, card, dev);
	275	if (minor >= 0 && snd_minors[minor])
	276	minor = -EBUSY;
	277	#endif
	278	if (minor < 0) {
1a60d4c5	279	mutex_unlock(&sound_mutex);
1da177e4	280	kfree(preg);
332682b1	281	return minor;
1da177e4	282	}
6983b724	283	snd_minors[minor] = preg;
abe9ab8f GKH	284	preg->dev = device_create(sound_class, device, MKDEV(major, minor),
abe9ab8f GKH	285	private_data, "%s", name);
2469049e MK	286	if (IS_ERR(preg->dev)) {
	287	snd_minors[minor] = NULL;
	288	mutex_unlock(&sound_mutex);
	289	minor = PTR_ERR(preg->dev);
	290	kfree(preg);
	291	return minor;
	292	}
	293
1a60d4c5	294	mutex_unlock(&sound_mutex);
1da177e4 LT	295	return 0;
	296	}
	297
12b131c4	298	EXPORT_SYMBOL(snd_register_device_for_dev);
c0d3fb39	299
9d19f48c TI	300	/* find the matching minor record
	301	* return the index of snd_minor, or -1 if not found
	302	*/
	303	static int find_snd_minor(int type, struct snd_card *card, int dev)
	304	{
	305	int cardnum, minor;
	306	struct snd_minor *mptr;
	307
	308	cardnum = card ? card->number : -1;
	309	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
	310	if ((mptr = snd_minors[minor]) != NULL &&
	311	mptr->type == type &&
	312	mptr->card == cardnum &&
	313	mptr->device == dev)
	314	return minor;
	315	return -1;
	316	}
	317
1da177e4 LT	318	/**
	319	* snd_unregister_device - unregister the device on the given card
	320	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	321	* @card: the card instance
	322	* @dev: the device index
	323	*
	324	* Unregisters the device file already registered via
	325	* snd_register_device().
	326	*
	327	* Returns zero if sucecessful, or a negative error code on failure
	328	*/
512bbd6a	329	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4	330	{
9d19f48c	331	int minor;
1da177e4	332
1a60d4c5	333	mutex_lock(&sound_mutex);
9d19f48c TI	334	minor = find_snd_minor(type, card, dev);
9d19f48c TI	335	if (minor < 0) {
1a60d4c5	336	mutex_unlock(&sound_mutex);
1da177e4 LT	337	return -EINVAL;
	338	}
	339
d80f19fa	340	device_destroy(sound_class, MKDEV(major, minor));
1da177e4	341
9d19f48c	342	kfree(snd_minors[minor]);
6983b724	343	snd_minors[minor] = NULL;
1a60d4c5	344	mutex_unlock(&sound_mutex);
1da177e4 LT	345	return 0;
	346	}
	347
c0d3fb39 TI	348	EXPORT_SYMBOL(snd_unregister_device);
c0d3fb39 TI	349
9d19f48c	350	int snd_add_device_sysfs_file(int type, struct snd_card *card, int dev,
d80f19fa	351	struct device_attribute *attr)
9d19f48c TI	352	{
9d19f48c TI	353	int minor, ret = -EINVAL;
d80f19fa	354	struct device *d;
9d19f48c TI	355
	356	mutex_lock(&sound_mutex);
	357	minor = find_snd_minor(type, card, dev);
d80f19fa GKH	358	if (minor >= 0 && (d = snd_minors[minor]->dev) != NULL)
d80f19fa GKH	359	ret = device_create_file(d, attr);
9d19f48c TI	360	mutex_unlock(&sound_mutex);
	361	return ret;
	362
	363	}
	364
	365	EXPORT_SYMBOL(snd_add_device_sysfs_file);
	366
e28563cc	367	#ifdef CONFIG_PROC_FS
1da177e4 LT	368	/*
	369	* INFO PART
	370	*/
	371
6581f4e7	372	static struct snd_info_entry *snd_minor_info_entry;
1da177e4	373
2af677fc CL	374	static const char *snd_device_type_name(int type)
	375	{
	376	switch (type) {
	377	case SNDRV_DEVICE_TYPE_CONTROL:
	378	return "control";
	379	case SNDRV_DEVICE_TYPE_HWDEP:
	380	return "hardware dependent";
	381	case SNDRV_DEVICE_TYPE_RAWMIDI:
	382	return "raw midi";
	383	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	384	return "digital audio playback";
	385	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	386	return "digital audio capture";
	387	case SNDRV_DEVICE_TYPE_SEQUENCER:
	388	return "sequencer";
	389	case SNDRV_DEVICE_TYPE_TIMER:
	390	return "timer";
	391	default:
	392	return "?";
	393	}
	394	}
	395
512bbd6a	396	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	397	{
6983b724	398	int minor;
512bbd6a	399	struct snd_minor *mptr;
1da177e4	400
1a60d4c5	401	mutex_lock(&sound_mutex);
6983b724 CL	402	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	403	if (!(mptr = snd_minors[minor]))
	404	continue;
	405	if (mptr->card >= 0) {
	406	if (mptr->device >= 0)
d001544d	407	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	408	minor, mptr->card, mptr->device,
	409	snd_device_type_name(mptr->type));
	410	else
d001544d	411	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	412	minor, mptr->card,
	413	snd_device_type_name(mptr->type));
	414	} else
d001544d	415	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	416	snd_device_type_name(mptr->type));
1da177e4	417	}
1a60d4c5	418	mutex_unlock(&sound_mutex);
1da177e4 LT	419	}
	420
	421	int __init snd_minor_info_init(void)
	422	{
512bbd6a	423	struct snd_info_entry *entry;
1da177e4 LT	424
	425	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	426	if (entry) {
1da177e4 LT	427	entry->c.text.read = snd_minor_info_read;
	428	if (snd_info_register(entry) < 0) {
	429	snd_info_free_entry(entry);
	430	entry = NULL;
	431	}
	432	}
	433	snd_minor_info_entry = entry;
	434	return 0;
	435	}
	436
	437	int __exit snd_minor_info_done(void)
	438	{
746d4a02	439	snd_info_free_entry(snd_minor_info_entry);
1da177e4 LT	440	return 0;
1da177e4 LT	441	}
e28563cc	442	#endif /* CONFIG_PROC_FS */
1da177e4 LT	443
	444	/*
	445	* INIT PART
	446	*/
	447
	448	static int __init alsa_sound_init(void)
	449	{
1da177e4 LT	450	snd_major = major;
1da177e4 LT	451	snd_ecards_limit = cards_limit;
1da177e4 LT	452	if (register_chrdev(major, "alsa", &snd_fops)) {
1da177e4 LT	453	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
1da177e4 LT	454	return -EIO;
1da177e4 LT	455	}
1da177e4	456	if (snd_info_init() < 0) {
1da177e4	457	unregister_chrdev(major, "alsa");
1da177e4 LT	458	return -ENOMEM;
	459	}
	460	snd_info_minor_register();
1da177e4 LT	461	#ifndef MODULE
	462	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
	463	#endif
	464	return 0;
	465	}
	466
	467	static void __exit alsa_sound_exit(void)
	468	{
1da177e4 LT	469	snd_info_minor_unregister();
1da177e4 LT	470	snd_info_done();
68fc4fab	471	unregister_chrdev(major, "alsa");
1da177e4 LT	472	}
1da177e4 LT	473
c181a13a TLSC	474	subsys_initcall(alsa_sound_init);
c181a13a TLSC	475	module_exit(alsa_sound_exit);