[deliverable/linux.git] / sound / core / sound.c

/*
 *  Advanced Linux Sound Architecture
 *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/time.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/devfs_fs_kernel.h>

#define SNDRV_OS_MINORS 256

static int major = CONFIG_SND_MAJOR;
int snd_major;
static int cards_limit = 1;
static int device_mode = S_IFCHR | S_IRUGO | S_IWUGO;

MODULE_AUTHOR("Jaroslav Kysela <perex@suse.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.");
#ifdef CONFIG_DEVFS_FS
module_param(device_mode, int, 0444);
MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs.");
#endif
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;

static struct list_head snd_minors_hash[SNDRV_CARDS];

static DECLARE_MUTEX(sound_mutex);

extern struct class *sound_class;


#ifdef CONFIG_KMOD

/**
 * 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 KMOD.  Returns immediately if already loaded.
 */
void snd_request_card(int card)
{
	int locked;

	if (! current->fs->root)
		return;
	read_lock(&snd_card_rwlock);
	locked = snd_cards_lock & (1 << card);
	read_unlock(&snd_card_rwlock);
	if (locked)
		return;
	if (card < 0 || card >= cards_limit)
		return;
	request_module("snd-card-%i", card);
}

static void snd_request_other(int minor)
{
	char *str;

	if (! current->fs->root)
		return;
	switch (minor) {
	case SNDRV_MINOR_SEQUENCER:	str = "snd-seq";	break;
	case SNDRV_MINOR_TIMER:		str = "snd-timer";	break;
	default:			return;
	}
	request_module(str);
}

#endif				/* request_module support */

static struct snd_minor *snd_minor_search(int minor)
{
	struct list_head *list;
	struct snd_minor *mptr;

	list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) {
		mptr = list_entry(list, struct snd_minor, list);
		if (mptr->number == minor)
			return mptr;
	}
	return NULL;
}

static int snd_open(struct inode *inode, struct file *file)
{
	int minor = iminor(inode);
	int card = SNDRV_MINOR_CARD(minor);
	int dev = SNDRV_MINOR_DEVICE(minor);
	struct snd_minor *mptr = NULL;
	struct file_operations *old_fops;
	int err = 0;

	if (dev != SNDRV_MINOR_GLOBAL) {
		if (snd_cards[card] == NULL) {
#ifdef CONFIG_KMOD
			snd_request_card(card);
			if (snd_cards[card] == NULL)
#endif
				return -ENODEV;
		}
	} else {
#ifdef CONFIG_KMOD
		if ((mptr = snd_minor_search(minor)) == NULL)
			snd_request_other(minor);
#endif
	}
	if (mptr == NULL && (mptr = snd_minor_search(minor)) == NULL)
		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;
}

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

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:
		snd_assert(card != NULL, 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:
		snd_assert(card != NULL, return -EINVAL);
		minor = SNDRV_MINOR(card->number, type + dev);
		break;
	default:
		return -EINVAL;
	}
	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	return minor;
}

/**
 * snd_register_device - Register the ALSA device file for the card
 * @type: the device type, SNDRV_DEVICE_TYPE_XXX
 * @card: the card instance
 * @dev: the device index
 * @f_ops: the file operations
 * @name: the device file name
 *
 * Registers an ALSA device file for the given card.
 * The operators have to be set in reg parameter.
 *
 * Retrurns zero if successful, or a negative error code on failure.
 */
int snd_register_device(int type, struct snd_card *card, int dev,
			struct file_operations *f_ops, const char *name)
{
	int minor = snd_kernel_minor(type, card, dev);
	struct snd_minor *preg;
	struct device *device = NULL;

	if (minor < 0)
		return minor;
	snd_assert(name, return -EINVAL);
	preg = kzalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
	if (preg == NULL)
		return -ENOMEM;
	preg->number = minor;
	preg->type = type;
	preg->device = dev;
	preg->f_ops = f_ops;
	strcpy(preg->name, name);
	down(&sound_mutex);
	if (snd_minor_search(minor)) {
		up(&sound_mutex);
		kfree(preg);
		return -EBUSY;
	}
	list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]);
	if (strncmp(name, "controlC", 8) || card->number >= cards_limit)
		devfs_mk_cdev(MKDEV(major, minor), S_IFCHR | device_mode, "snd/%s", name);
	if (card)
		device = card->dev;
	class_device_create(sound_class, NULL, MKDEV(major, minor), device, "%s", name);

	up(&sound_mutex);
	return 0;
}

/**
 * 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 = snd_kernel_minor(type, card, dev);
	struct snd_minor *mptr;

	if (minor < 0)
		return minor;
	down(&sound_mutex);
	if ((mptr = snd_minor_search(minor)) == NULL) {
		up(&sound_mutex);
		return -EINVAL;
	}

	if (strncmp(mptr->name, "controlC", 8) || card->number >= cards_limit) /* created in sound.c */
		devfs_remove("snd/%s", mptr->name);
	class_device_destroy(sound_class, MKDEV(major, minor));

	list_del(&mptr->list);
	up(&sound_mutex);
	kfree(mptr);
	return 0;
}

/*
 *  INFO PART
 */

static struct snd_info_entry *snd_minor_info_entry = NULL;

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 card, device;
	struct list_head *list;
	struct snd_minor *mptr;

	down(&sound_mutex);
	for (card = 0; card < SNDRV_CARDS; card++) {
		list_for_each(list, &snd_minors_hash[card]) {
			mptr = list_entry(list, struct snd_minor, list);
			if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_GLOBAL) {
				if ((device = mptr->device) >= 0)
					snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, snd_device_type_name(mptr->type));
				else
					snd_iprintf(buffer, "%3i: [%i]   : %s\n", mptr->number, card, snd_device_type_name(mptr->type));
			} else {
				snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, snd_device_type_name(mptr->type));
			}
		}
	}
	up(&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_size = PAGE_SIZE;
		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)
{
	if (snd_minor_info_entry)
		snd_info_unregister(snd_minor_info_entry);
	return 0;
}

/*
 *  INIT PART
 */

static int __init alsa_sound_init(void)
{
	short controlnum;
	int err;
	int card;

	snd_major = major;
	snd_ecards_limit = cards_limit;
	for (card = 0; card < SNDRV_CARDS; card++)
		INIT_LIST_HEAD(&snd_minors_hash[card]);
	if ((err = snd_oss_init_module()) < 0)
		return err;
	devfs_mk_dir("snd");
	if (register_chrdev(major, "alsa", &snd_fops)) {
		snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
		devfs_remove("snd");
		return -EIO;
	}
	if (snd_info_init() < 0) {
		unregister_chrdev(major, "alsa");
		devfs_remove("snd");
		return -ENOMEM;
	}
	snd_info_minor_register();
	for (controlnum = 0; controlnum < cards_limit; controlnum++)
		devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR | device_mode, "snd/controlC%d", controlnum);
#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)
{
	short controlnum;

	for (controlnum = 0; controlnum < cards_limit; controlnum++)
		devfs_remove("snd/controlC%d", controlnum);

	snd_info_minor_unregister();
	snd_info_done();
	if (unregister_chrdev(major, "alsa") != 0)
		snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
	devfs_remove("snd");
}

module_init(alsa_sound_init)
module_exit(alsa_sound_exit)

  /* sound.c */
EXPORT_SYMBOL(snd_major);
EXPORT_SYMBOL(snd_ecards_limit);
#if defined(CONFIG_KMOD)
EXPORT_SYMBOL(snd_request_card);
#endif
EXPORT_SYMBOL(snd_register_device);
EXPORT_SYMBOL(snd_unregister_device);
#if defined(CONFIG_SND_OSSEMUL)
EXPORT_SYMBOL(snd_register_oss_device);
EXPORT_SYMBOL(snd_unregister_oss_device);
#endif
  /* memory.c */
EXPORT_SYMBOL(copy_to_user_fromio);
EXPORT_SYMBOL(copy_from_user_toio);
  /* init.c */
EXPORT_SYMBOL(snd_cards);
#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
#endif
EXPORT_SYMBOL(snd_card_new);
EXPORT_SYMBOL(snd_card_disconnect);
EXPORT_SYMBOL(snd_card_free);
EXPORT_SYMBOL(snd_card_free_in_thread);
EXPORT_SYMBOL(snd_card_register);
EXPORT_SYMBOL(snd_component_add);
EXPORT_SYMBOL(snd_card_file_add);
EXPORT_SYMBOL(snd_card_file_remove);
#ifdef CONFIG_PM
EXPORT_SYMBOL(snd_power_wait);
#endif
  /* device.c */
EXPORT_SYMBOL(snd_device_new);
EXPORT_SYMBOL(snd_device_register);
EXPORT_SYMBOL(snd_device_free);
  /* isadma.c */
#ifdef CONFIG_ISA_DMA_API
EXPORT_SYMBOL(snd_dma_program);
EXPORT_SYMBOL(snd_dma_disable);
EXPORT_SYMBOL(snd_dma_pointer);
#endif
  /* info.c */
#ifdef CONFIG_PROC_FS
EXPORT_SYMBOL(snd_seq_root);
EXPORT_SYMBOL(snd_iprintf);
EXPORT_SYMBOL(snd_info_get_line);
EXPORT_SYMBOL(snd_info_get_str);
EXPORT_SYMBOL(snd_info_create_module_entry);
EXPORT_SYMBOL(snd_info_create_card_entry);
EXPORT_SYMBOL(snd_info_free_entry);
EXPORT_SYMBOL(snd_info_register);
EXPORT_SYMBOL(snd_info_unregister);
EXPORT_SYMBOL(snd_card_proc_new);
#endif
  /* info_oss.c */
#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
EXPORT_SYMBOL(snd_oss_info_register);
#endif
  /* control.c */
EXPORT_SYMBOL(snd_ctl_new);
EXPORT_SYMBOL(snd_ctl_new1);
EXPORT_SYMBOL(snd_ctl_free_one);
EXPORT_SYMBOL(snd_ctl_add);
EXPORT_SYMBOL(snd_ctl_remove);
EXPORT_SYMBOL(snd_ctl_remove_id);
EXPORT_SYMBOL(snd_ctl_rename_id);
EXPORT_SYMBOL(snd_ctl_find_numid);
EXPORT_SYMBOL(snd_ctl_find_id);
EXPORT_SYMBOL(snd_ctl_notify);
EXPORT_SYMBOL(snd_ctl_register_ioctl);
EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
#ifdef CONFIG_COMPAT
EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
#endif
EXPORT_SYMBOL(snd_ctl_elem_read);
EXPORT_SYMBOL(snd_ctl_elem_write);
  /* misc.c */
EXPORT_SYMBOL(release_and_free_resource);
#ifdef CONFIG_SND_VERBOSE_PRINTK
EXPORT_SYMBOL(snd_verbose_printk);
#endif
#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
EXPORT_SYMBOL(snd_verbose_printd);
#endif
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Advanced Linux Sound Architecture
	3	* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
	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
	22	#include <sound/driver.h>
	23	#include <linux/init.h>
	24	#include <linux/slab.h>
	25	#include <linux/time.h>
	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>
	34	#include <linux/devfs_fs_kernel.h>
1da177e4 LT	35
	36	#define SNDRV_OS_MINORS 256
	37
	38	static int major = CONFIG_SND_MAJOR;
	39	int snd_major;
	40	static int cards_limit = 1;
	41	static int device_mode = S_IFCHR \| S_IRUGO \| S_IWUGO;
	42
	43	MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
	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.");
	50	#ifdef CONFIG_DEVFS_FS
	51	module_param(device_mode, int, 0444);
	52	MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs.");
	53	#endif
	54	MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
	55
	56	/* this one holds the actual max. card number currently available.
	57	* as default, it's identical with cards_limit option. when more
	58	* modules are loaded manually, this limit number increases, too.
	59	*/
	60	int snd_ecards_limit;
	61
	62	static struct list_head snd_minors_hash[SNDRV_CARDS];
	63
	64	static DECLARE_MUTEX(sound_mutex);
	65
619e666b	66	extern struct class *sound_class;
1da177e4 LT	67
	68
	69	#ifdef CONFIG_KMOD
	70
	71	/**
	72	* snd_request_card - try to load the card module
	73	* @card: the card number
	74	*
	75	* Tries to load the module "snd-card-X" for the given card number
	76	* via KMOD. Returns immediately if already loaded.
	77	*/
	78	void snd_request_card(int card)
	79	{
	80	int locked;
	81
	82	if (! current->fs->root)
	83	return;
	84	read_lock(&snd_card_rwlock);
	85	locked = snd_cards_lock & (1 << card);
	86	read_unlock(&snd_card_rwlock);
	87	if (locked)
	88	return;
	89	if (card < 0 \|\| card >= cards_limit)
	90	return;
	91	request_module("snd-card-%i", card);
	92	}
	93
	94	static void snd_request_other(int minor)
	95	{
	96	char *str;
	97
	98	if (! current->fs->root)
	99	return;
	100	switch (minor) {
	101	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	102	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	103	default: return;
	104	}
	105	request_module(str);
	106	}
	107
	108	#endif /* request_module support */
	109
512bbd6a	110	static struct snd_minor *snd_minor_search(int minor)
1da177e4 LT	111	{
1da177e4 LT	112	struct list_head *list;
512bbd6a	113	struct snd_minor *mptr;
1da177e4 LT	114
1da177e4 LT	115	list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) {
512bbd6a	116	mptr = list_entry(list, struct snd_minor, list);
1da177e4 LT	117	if (mptr->number == minor)
	118	return mptr;
	119	}
	120	return NULL;
	121	}
	122
	123	static int snd_open(struct inode inode, struct file file)
	124	{
	125	int minor = iminor(inode);
	126	int card = SNDRV_MINOR_CARD(minor);
	127	int dev = SNDRV_MINOR_DEVICE(minor);
512bbd6a	128	struct snd_minor *mptr = NULL;
1da177e4 LT	129	struct file_operations *old_fops;
	130	int err = 0;
	131
3939e714	132	if (dev != SNDRV_MINOR_GLOBAL) {
1da177e4 LT	133	if (snd_cards[card] == NULL) {
	134	#ifdef CONFIG_KMOD
	135	snd_request_card(card);
	136	if (snd_cards[card] == NULL)
	137	#endif
	138	return -ENODEV;
	139	}
	140	} else {
	141	#ifdef CONFIG_KMOD
	142	if ((mptr = snd_minor_search(minor)) == NULL)
	143	snd_request_other(minor);
	144	#endif
	145	}
	146	if (mptr == NULL && (mptr = snd_minor_search(minor)) == NULL)
	147	return -ENODEV;
	148	old_fops = file->f_op;
	149	file->f_op = fops_get(mptr->f_ops);
	150	if (file->f_op->open)
	151	err = file->f_op->open(inode, file);
	152	if (err) {
	153	fops_put(file->f_op);
	154	file->f_op = fops_get(old_fops);
	155	}
	156	fops_put(old_fops);
	157	return err;
	158	}
	159
	160	static struct file_operations snd_fops =
	161	{
	162	.owner = THIS_MODULE,
	163	.open = snd_open
	164	};
	165
512bbd6a	166	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	167	{
	168	int minor;
	169
	170	switch (type) {
	171	case SNDRV_DEVICE_TYPE_SEQUENCER:
	172	case SNDRV_DEVICE_TYPE_TIMER:
	173	minor = type;
	174	break;
	175	case SNDRV_DEVICE_TYPE_CONTROL:
	176	snd_assert(card != NULL, return -EINVAL);
	177	minor = SNDRV_MINOR(card->number, type);
	178	break;
	179	case SNDRV_DEVICE_TYPE_HWDEP:
	180	case SNDRV_DEVICE_TYPE_RAWMIDI:
	181	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	182	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	183	snd_assert(card != NULL, return -EINVAL);
	184	minor = SNDRV_MINOR(card->number, type + dev);
	185	break;
	186	default:
	187	return -EINVAL;
	188	}
	189	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	190	return minor;
	191	}
	192
	193	/**
	194	* snd_register_device - Register the ALSA device file for the card
	195	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	196	* @card: the card instance
	197	* @dev: the device index
2af677fc	198	* @f_ops: the file operations
1da177e4 LT	199	* @name: the device file name
	200	*
	201	* Registers an ALSA device file for the given card.
	202	* The operators have to be set in reg parameter.
	203	*
	204	* Retrurns zero if successful, or a negative error code on failure.
	205	*/
2af677fc CL	206	int snd_register_device(int type, struct snd_card *card, int dev,
2af677fc CL	207	struct file_operations f_ops, const char name)
1da177e4 LT	208	{
1da177e4 LT	209	int minor = snd_kernel_minor(type, card, dev);
512bbd6a	210	struct snd_minor *preg;
1da177e4 LT	211	struct device *device = NULL;
	212
	213	if (minor < 0)
	214	return minor;
	215	snd_assert(name, return -EINVAL);
2af677fc	216	preg = kzalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
1da177e4 LT	217	if (preg == NULL)
1da177e4 LT	218	return -ENOMEM;
1da177e4	219	preg->number = minor;
2af677fc	220	preg->type = type;
1da177e4	221	preg->device = dev;
2af677fc	222	preg->f_ops = f_ops;
1da177e4 LT	223	strcpy(preg->name, name);
	224	down(&sound_mutex);
	225	if (snd_minor_search(minor)) {
	226	up(&sound_mutex);
	227	kfree(preg);
	228	return -EBUSY;
	229	}
	230	list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]);
	231	if (strncmp(name, "controlC", 8) \|\| card->number >= cards_limit)
	232	devfs_mk_cdev(MKDEV(major, minor), S_IFCHR \| device_mode, "snd/%s", name);
	233	if (card)
	234	device = card->dev;
53f46542	235	class_device_create(sound_class, NULL, MKDEV(major, minor), device, "%s", name);
1da177e4 LT	236
	237	up(&sound_mutex);
	238	return 0;
	239	}
	240
	241	/**
	242	* snd_unregister_device - unregister the device on the given card
	243	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	244	* @card: the card instance
	245	* @dev: the device index
	246	*
	247	* Unregisters the device file already registered via
	248	* snd_register_device().
	249	*
	250	* Returns zero if sucecessful, or a negative error code on failure
	251	*/
512bbd6a	252	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4 LT	253	{
1da177e4 LT	254	int minor = snd_kernel_minor(type, card, dev);
512bbd6a	255	struct snd_minor *mptr;
1da177e4 LT	256
	257	if (minor < 0)
	258	return minor;
	259	down(&sound_mutex);
	260	if ((mptr = snd_minor_search(minor)) == NULL) {
	261	up(&sound_mutex);
	262	return -EINVAL;
	263	}
	264
	265	if (strncmp(mptr->name, "controlC", 8) \|\| card->number >= cards_limit) /* created in sound.c */
	266	devfs_remove("snd/%s", mptr->name);
619e666b	267	class_device_destroy(sound_class, MKDEV(major, minor));
1da177e4 LT	268
	269	list_del(&mptr->list);
	270	up(&sound_mutex);
	271	kfree(mptr);
	272	return 0;
	273	}
	274
	275	/*
	276	* INFO PART
	277	*/
	278
512bbd6a	279	static struct snd_info_entry *snd_minor_info_entry = NULL;
1da177e4	280
2af677fc CL	281	static const char *snd_device_type_name(int type)
	282	{
	283	switch (type) {
	284	case SNDRV_DEVICE_TYPE_CONTROL:
	285	return "control";
	286	case SNDRV_DEVICE_TYPE_HWDEP:
	287	return "hardware dependent";
	288	case SNDRV_DEVICE_TYPE_RAWMIDI:
	289	return "raw midi";
	290	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	291	return "digital audio playback";
	292	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	293	return "digital audio capture";
	294	case SNDRV_DEVICE_TYPE_SEQUENCER:
	295	return "sequencer";
	296	case SNDRV_DEVICE_TYPE_TIMER:
	297	return "timer";
	298	default:
	299	return "?";
	300	}
	301	}
	302
512bbd6a	303	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4 LT	304	{
	305	int card, device;
	306	struct list_head *list;
512bbd6a	307	struct snd_minor *mptr;
1da177e4 LT	308
	309	down(&sound_mutex);
	310	for (card = 0; card < SNDRV_CARDS; card++) {
	311	list_for_each(list, &snd_minors_hash[card]) {
512bbd6a	312	mptr = list_entry(list, struct snd_minor, list);
3939e714	313	if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_GLOBAL) {
1da177e4	314	if ((device = mptr->device) >= 0)
2af677fc	315	snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, snd_device_type_name(mptr->type));
1da177e4	316	else
2af677fc	317	snd_iprintf(buffer, "%3i: [%i] : %s\n", mptr->number, card, snd_device_type_name(mptr->type));
1da177e4	318	} else {
2af677fc	319	snd_iprintf(buffer, "%3i: : %s\n", mptr->number, snd_device_type_name(mptr->type));
1da177e4 LT	320	}
	321	}
	322	}
	323	up(&sound_mutex);
	324	}
	325
	326	int __init snd_minor_info_init(void)
	327	{
512bbd6a	328	struct snd_info_entry *entry;
1da177e4 LT	329
	330	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	331	if (entry) {
	332	entry->c.text.read_size = PAGE_SIZE;
	333	entry->c.text.read = snd_minor_info_read;
	334	if (snd_info_register(entry) < 0) {
	335	snd_info_free_entry(entry);
	336	entry = NULL;
	337	}
	338	}
	339	snd_minor_info_entry = entry;
	340	return 0;
	341	}
	342
	343	int __exit snd_minor_info_done(void)
	344	{
	345	if (snd_minor_info_entry)
	346	snd_info_unregister(snd_minor_info_entry);
	347	return 0;
	348	}
	349
	350	/*
	351	* INIT PART
	352	*/
	353
	354	static int __init alsa_sound_init(void)
	355	{
	356	short controlnum;
	357	int err;
	358	int card;
	359
	360	snd_major = major;
	361	snd_ecards_limit = cards_limit;
	362	for (card = 0; card < SNDRV_CARDS; card++)
	363	INIT_LIST_HEAD(&snd_minors_hash[card]);
	364	if ((err = snd_oss_init_module()) < 0)
	365	return err;
	366	devfs_mk_dir("snd");
	367	if (register_chrdev(major, "alsa", &snd_fops)) {
	368	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
	369	devfs_remove("snd");
	370	return -EIO;
	371	}
1da177e4	372	if (snd_info_init() < 0) {
1da177e4 LT	373	unregister_chrdev(major, "alsa");
	374	devfs_remove("snd");
	375	return -ENOMEM;
	376	}
	377	snd_info_minor_register();
	378	for (controlnum = 0; controlnum < cards_limit; controlnum++)
	379	devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR \| device_mode, "snd/controlC%d", controlnum);
	380	#ifndef MODULE
	381	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
	382	#endif
	383	return 0;
	384	}
	385
	386	static void __exit alsa_sound_exit(void)
	387	{
	388	short controlnum;
	389
	390	for (controlnum = 0; controlnum < cards_limit; controlnum++)
	391	devfs_remove("snd/controlC%d", controlnum);
	392
	393	snd_info_minor_unregister();
	394	snd_info_done();
1da177e4 LT	395	if (unregister_chrdev(major, "alsa") != 0)
	396	snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
	397	devfs_remove("snd");
	398	}
	399
	400	module_init(alsa_sound_init)
	401	module_exit(alsa_sound_exit)
	402
	403	/* sound.c */
	404	EXPORT_SYMBOL(snd_major);
	405	EXPORT_SYMBOL(snd_ecards_limit);
	406	#if defined(CONFIG_KMOD)
	407	EXPORT_SYMBOL(snd_request_card);
	408	#endif
	409	EXPORT_SYMBOL(snd_register_device);
	410	EXPORT_SYMBOL(snd_unregister_device);
	411	#if defined(CONFIG_SND_OSSEMUL)
	412	EXPORT_SYMBOL(snd_register_oss_device);
	413	EXPORT_SYMBOL(snd_unregister_oss_device);
	414	#endif
	415	/* memory.c */
1da177e4 LT	416	EXPORT_SYMBOL(copy_to_user_fromio);
	417	EXPORT_SYMBOL(copy_from_user_toio);
	418	/* init.c */
	419	EXPORT_SYMBOL(snd_cards);
	420	#if defined(CONFIG_SND_MIXER_OSS) \|\| defined(CONFIG_SND_MIXER_OSS_MODULE)
	421	EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
	422	#endif
	423	EXPORT_SYMBOL(snd_card_new);
	424	EXPORT_SYMBOL(snd_card_disconnect);
	425	EXPORT_SYMBOL(snd_card_free);
	426	EXPORT_SYMBOL(snd_card_free_in_thread);
	427	EXPORT_SYMBOL(snd_card_register);
	428	EXPORT_SYMBOL(snd_component_add);
	429	EXPORT_SYMBOL(snd_card_file_add);
	430	EXPORT_SYMBOL(snd_card_file_remove);
	431	#ifdef CONFIG_PM
	432	EXPORT_SYMBOL(snd_power_wait);
1da177e4 LT	433	#endif
	434	/* device.c */
	435	EXPORT_SYMBOL(snd_device_new);
	436	EXPORT_SYMBOL(snd_device_register);
	437	EXPORT_SYMBOL(snd_device_free);
1da177e4	438	/* isadma.c */
276bd31c	439	#ifdef CONFIG_ISA_DMA_API
1da177e4 LT	440	EXPORT_SYMBOL(snd_dma_program);
	441	EXPORT_SYMBOL(snd_dma_disable);
	442	EXPORT_SYMBOL(snd_dma_pointer);
	443	#endif
	444	/* info.c */
	445	#ifdef CONFIG_PROC_FS
	446	EXPORT_SYMBOL(snd_seq_root);
	447	EXPORT_SYMBOL(snd_iprintf);
	448	EXPORT_SYMBOL(snd_info_get_line);
	449	EXPORT_SYMBOL(snd_info_get_str);
	450	EXPORT_SYMBOL(snd_info_create_module_entry);
	451	EXPORT_SYMBOL(snd_info_create_card_entry);
	452	EXPORT_SYMBOL(snd_info_free_entry);
	453	EXPORT_SYMBOL(snd_info_register);
	454	EXPORT_SYMBOL(snd_info_unregister);
	455	EXPORT_SYMBOL(snd_card_proc_new);
	456	#endif
	457	/* info_oss.c */
	458	#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
	459	EXPORT_SYMBOL(snd_oss_info_register);
	460	#endif
	461	/* control.c */
	462	EXPORT_SYMBOL(snd_ctl_new);
	463	EXPORT_SYMBOL(snd_ctl_new1);
	464	EXPORT_SYMBOL(snd_ctl_free_one);
	465	EXPORT_SYMBOL(snd_ctl_add);
	466	EXPORT_SYMBOL(snd_ctl_remove);
	467	EXPORT_SYMBOL(snd_ctl_remove_id);
	468	EXPORT_SYMBOL(snd_ctl_rename_id);
	469	EXPORT_SYMBOL(snd_ctl_find_numid);
	470	EXPORT_SYMBOL(snd_ctl_find_id);
	471	EXPORT_SYMBOL(snd_ctl_notify);
	472	EXPORT_SYMBOL(snd_ctl_register_ioctl);
	473	EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
	474	#ifdef CONFIG_COMPAT
	475	EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
	476	EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
	477	#endif
	478	EXPORT_SYMBOL(snd_ctl_elem_read);
	479	EXPORT_SYMBOL(snd_ctl_elem_write);
	480	/* misc.c */
b1d5776d	481	EXPORT_SYMBOL(release_and_free_resource);
1da177e4 LT	482	#ifdef CONFIG_SND_VERBOSE_PRINTK
	483	EXPORT_SYMBOL(snd_verbose_printk);
	484	#endif
	485	#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
	486	EXPORT_SYMBOL(snd_verbose_printd);
1da177e4	487	#endif