[mirror_ubuntu-zesty-kernel.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>
#include <linux/platform_device.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 snd_minor_t *snd_minor_search(int minor)
{
	struct list_head *list;
	snd_minor_t *mptr;

	list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) {
		mptr = list_entry(list, snd_minor_t, 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);
	snd_minor_t *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, snd_card_t * 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
 * @reg: the snd_minor_t record
 * @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, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
{
	int minor = snd_kernel_minor(type, card, dev);
	snd_minor_t *preg;
	struct device *device = NULL;

	if (minor < 0)
		return minor;
	snd_assert(name, return -EINVAL);
	preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t) + strlen(name) + 1, GFP_KERNEL);
	if (preg == NULL)
		return -ENOMEM;
	*preg = *reg;
	preg->number = minor;
	preg->device = dev;
	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, snd_card_t * card, int dev)
{
	int minor = snd_kernel_minor(type, card, dev);
	snd_minor_t *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 snd_info_entry_t *snd_minor_info_entry = NULL;

static void snd_minor_info_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
{
	int card, device;
	struct list_head *list;
	snd_minor_t *mptr;

	down(&sound_mutex);
	for (card = 0; card < SNDRV_CARDS; card++) {
		list_for_each(list, &snd_minors_hash[card]) {
			mptr = list_entry(list, snd_minor_t, 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, mptr->comment);
				else
					snd_iprintf(buffer, "%3i: [%i]   : %s\n", mptr->number, card, mptr->comment);
			} else {
				snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
			}
		}
	}
	up(&sound_mutex);
}

int __init snd_minor_info_init(void)
{
	snd_info_entry_t *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
 */

#ifdef CONFIG_SND_GENERIC_DRIVER
extern struct platform_driver snd_generic_driver;
#endif

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();
#ifdef CONFIG_SND_GENERIC_DRIVER
	platform_driver_register(&snd_generic_driver);
#endif
	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);

#ifdef CONFIG_SND_GENERIC_DRIVER
	platform_driver_unregister(&snd_generic_driver);
#endif
	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_SND_GENERIC_DRIVER
EXPORT_SYMBOL(snd_card_set_generic_dev);
#endif
#ifdef CONFIG_PM
EXPORT_SYMBOL(snd_power_wait);
EXPORT_SYMBOL(snd_card_set_pm_callback);
#ifdef CONFIG_SND_GENERIC_DRIVER
EXPORT_SYMBOL(snd_card_set_generic_pm_callback);
#endif
#ifdef CONFIG_PCI
EXPORT_SYMBOL(snd_card_pci_suspend);
EXPORT_SYMBOL(snd_card_pci_resume);
#endif
#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>
3ae5eaec	35	#include <linux/platform_device.h>
1da177e4 LT	36
	37	#define SNDRV_OS_MINORS 256
	38
	39	static int major = CONFIG_SND_MAJOR;
	40	int snd_major;
	41	static int cards_limit = 1;
	42	static int device_mode = S_IFCHR \| S_IRUGO \| S_IWUGO;
	43
	44	MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
	45	MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
	46	MODULE_LICENSE("GPL");
	47	module_param(major, int, 0444);
	48	MODULE_PARM_DESC(major, "Major # for sound driver.");
	49	module_param(cards_limit, int, 0444);
	50	MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
	51	#ifdef CONFIG_DEVFS_FS
	52	module_param(device_mode, int, 0444);
	53	MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs.");
	54	#endif
	55	MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
	56
	57	/* this one holds the actual max. card number currently available.
	58	* as default, it's identical with cards_limit option. when more
	59	* modules are loaded manually, this limit number increases, too.
	60	*/
	61	int snd_ecards_limit;
	62
	63	static struct list_head snd_minors_hash[SNDRV_CARDS];
	64
	65	static DECLARE_MUTEX(sound_mutex);
	66
619e666b	67	extern struct class *sound_class;
1da177e4 LT	68
	69
	70	#ifdef CONFIG_KMOD
	71
	72	/**
	73	* snd_request_card - try to load the card module
	74	* @card: the card number
	75	*
	76	* Tries to load the module "snd-card-X" for the given card number
	77	* via KMOD. Returns immediately if already loaded.
	78	*/
	79	void snd_request_card(int card)
	80	{
	81	int locked;
	82
	83	if (! current->fs->root)
	84	return;
	85	read_lock(&snd_card_rwlock);
	86	locked = snd_cards_lock & (1 << card);
	87	read_unlock(&snd_card_rwlock);
	88	if (locked)
	89	return;
	90	if (card < 0 \|\| card >= cards_limit)
	91	return;
	92	request_module("snd-card-%i", card);
	93	}
	94
	95	static void snd_request_other(int minor)
	96	{
	97	char *str;
	98
	99	if (! current->fs->root)
	100	return;
	101	switch (minor) {
	102	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	103	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	104	default: return;
	105	}
	106	request_module(str);
	107	}
	108
	109	#endif /* request_module support */
	110
	111	static snd_minor_t *snd_minor_search(int minor)
	112	{
	113	struct list_head *list;
	114	snd_minor_t *mptr;
	115
	116	list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) {
	117	mptr = list_entry(list, snd_minor_t, list);
	118	if (mptr->number == minor)
	119	return mptr;
	120	}
	121	return NULL;
	122	}
	123
	124	static int snd_open(struct inode inode, struct file file)
	125	{
	126	int minor = iminor(inode);
	127	int card = SNDRV_MINOR_CARD(minor);
	128	int dev = SNDRV_MINOR_DEVICE(minor);
	129	snd_minor_t *mptr = NULL;
	130	struct file_operations *old_fops;
	131	int err = 0;
132
3939e714	133	if (dev != SNDRV_MINOR_GLOBAL) {
1da177e4 LT	134	if (snd_cards[card] == NULL) {
	135	#ifdef CONFIG_KMOD
	136	snd_request_card(card);
	137	if (snd_cards[card] == NULL)
	138	#endif
	139	return -ENODEV;
	140	}
	141	} else {
	142	#ifdef CONFIG_KMOD
	143	if ((mptr = snd_minor_search(minor)) == NULL)
	144	snd_request_other(minor);
	145	#endif
	146	}
	147	if (mptr == NULL && (mptr = snd_minor_search(minor)) == NULL)
	148	return -ENODEV;
	149	old_fops = file->f_op;
	150	file->f_op = fops_get(mptr->f_ops);
	151	if (file->f_op->open)
	152	err = file->f_op->open(inode, file);
	153	if (err) {
	154	fops_put(file->f_op);
	155	file->f_op = fops_get(old_fops);
	156	}
	157	fops_put(old_fops);
	158	return err;
	159	}
	160
	161	static struct file_operations snd_fops =
	162	{
	163	.owner = THIS_MODULE,
	164	.open = snd_open
	165	};
	166
	167	static int snd_kernel_minor(int type, snd_card_t * card, int dev)
	168	{
	169	int minor;
	170
	171	switch (type) {
	172	case SNDRV_DEVICE_TYPE_SEQUENCER:
	173	case SNDRV_DEVICE_TYPE_TIMER:
	174	minor = type;
	175	break;
	176	case SNDRV_DEVICE_TYPE_CONTROL:
	177	snd_assert(card != NULL, return -EINVAL);
	178	minor = SNDRV_MINOR(card->number, type);
	179	break;
	180	case SNDRV_DEVICE_TYPE_HWDEP:
	181	case SNDRV_DEVICE_TYPE_RAWMIDI:
	182	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	183	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	184	snd_assert(card != NULL, return -EINVAL);
	185	minor = SNDRV_MINOR(card->number, type + dev);
	186	break;
	187	default:
	188	return -EINVAL;
	189	}
	190	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	191	return minor;
	192	}
	193
	194	/**
	195	* snd_register_device - Register the ALSA device file for the card
	196	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	197	* @card: the card instance
198	* @dev: the device index
199	* @reg: the snd_minor_t record
200	* @name: the device file name
201	*
202	* Registers an ALSA device file for the given card.
203	* The operators have to be set in reg parameter.
204	*
205	* Retrurns zero if successful, or a negative error code on failure.
206	*/
207	int snd_register_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
208	{
209	int minor = snd_kernel_minor(type, card, dev);
210	snd_minor_t *preg;
211	struct device *device = NULL;
212
213	if (minor < 0)
214	return minor;
215	snd_assert(name, return -EINVAL);
216	preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t) + strlen(name) + 1, GFP_KERNEL);
217	if (preg == NULL)
218	return -ENOMEM;
219	preg = reg;
220	preg->number = minor;
221	preg->device = dev;
222	strcpy(preg->name, name);
223	down(&sound_mutex);
224	if (snd_minor_search(minor)) {
225	up(&sound_mutex);
226	kfree(preg);
227	return -EBUSY;
228	}
229	list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]);
230	if (strncmp(name, "controlC", 8) \|\| card->number >= cards_limit)
231	devfs_mk_cdev(MKDEV(major, minor), S_IFCHR \| device_mode, "snd/%s", name);
232	if (card)
233	device = card->dev;
53f46542	234	class_device_create(sound_class, NULL, MKDEV(major, minor), device, "%s", name);
1da177e4 LT	235
	236	up(&sound_mutex);
	237	return 0;
	238	}
	239
	240	/**
	241	* snd_unregister_device - unregister the device on the given card
	242	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	243	* @card: the card instance
	244	* @dev: the device index
	245	*
	246	* Unregisters the device file already registered via
	247	* snd_register_device().
	248	*
	249	* Returns zero if sucecessful, or a negative error code on failure
	250	*/
	251	int snd_unregister_device(int type, snd_card_t * card, int dev)
	252	{
	253	int minor = snd_kernel_minor(type, card, dev);
	254	snd_minor_t *mptr;
	255
	256	if (minor < 0)
	257	return minor;
	258	down(&sound_mutex);
	259	if ((mptr = snd_minor_search(minor)) == NULL) {
	260	up(&sound_mutex);
	261	return -EINVAL;
	262	}
	263
	264	if (strncmp(mptr->name, "controlC", 8) \|\| card->number >= cards_limit) /* created in sound.c */
	265	devfs_remove("snd/%s", mptr->name);
619e666b	266	class_device_destroy(sound_class, MKDEV(major, minor));
1da177e4 LT	267
	268	list_del(&mptr->list);
	269	up(&sound_mutex);
	270	kfree(mptr);
	271	return 0;
	272	}
	273
	274	/*
	275	* INFO PART
	276	*/
	277
	278	static snd_info_entry_t *snd_minor_info_entry = NULL;
	279
	280	static void snd_minor_info_read(snd_info_entry_t entry, snd_info_buffer_t buffer)
	281	{
	282	int card, device;
	283	struct list_head *list;
	284	snd_minor_t *mptr;
	285
	286	down(&sound_mutex);
	287	for (card = 0; card < SNDRV_CARDS; card++) {
	288	list_for_each(list, &snd_minors_hash[card]) {
	289	mptr = list_entry(list, snd_minor_t, list);
3939e714	290	if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_GLOBAL) {
1da177e4 LT	291	if ((device = mptr->device) >= 0)
	292	snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, mptr->comment);
	293	else
	294	snd_iprintf(buffer, "%3i: [%i] : %s\n", mptr->number, card, mptr->comment);
	295	} else {
	296	snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment);
	297	}
	298	}
	299	}
	300	up(&sound_mutex);
	301	}
	302
	303	int __init snd_minor_info_init(void)
	304	{
	305	snd_info_entry_t *entry;
	306
	307	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	308	if (entry) {
	309	entry->c.text.read_size = PAGE_SIZE;
	310	entry->c.text.read = snd_minor_info_read;
	311	if (snd_info_register(entry) < 0) {
	312	snd_info_free_entry(entry);
	313	entry = NULL;
	314	}
	315	}
	316	snd_minor_info_entry = entry;
	317	return 0;
	318	}
	319
	320	int __exit snd_minor_info_done(void)
	321	{
	322	if (snd_minor_info_entry)
	323	snd_info_unregister(snd_minor_info_entry);
	324	return 0;
	325	}
	326
	327	/*
	328	* INIT PART
	329	*/
	330
ecbcfe36	331	#ifdef CONFIG_SND_GENERIC_DRIVER
3ae5eaec	332	extern struct platform_driver snd_generic_driver;
ecbcfe36 TI	333	#endif
ecbcfe36 TI	334
1da177e4 LT	335	static int __init alsa_sound_init(void)
	336	{
	337	short controlnum;
	338	int err;
	339	int card;
	340
	341	snd_major = major;
	342	snd_ecards_limit = cards_limit;
	343	for (card = 0; card < SNDRV_CARDS; card++)
	344	INIT_LIST_HEAD(&snd_minors_hash[card]);
	345	if ((err = snd_oss_init_module()) < 0)
	346	return err;
	347	devfs_mk_dir("snd");
	348	if (register_chrdev(major, "alsa", &snd_fops)) {
	349	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
	350	devfs_remove("snd");
	351	return -EIO;
	352	}
1da177e4	353	if (snd_info_init() < 0) {
1da177e4 LT	354	unregister_chrdev(major, "alsa");
	355	devfs_remove("snd");
	356	return -ENOMEM;
	357	}
	358	snd_info_minor_register();
ecbcfe36	359	#ifdef CONFIG_SND_GENERIC_DRIVER
3ae5eaec	360	platform_driver_register(&snd_generic_driver);
ecbcfe36	361	#endif
1da177e4 LT	362	for (controlnum = 0; controlnum < cards_limit; controlnum++)
	363	devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR \| device_mode, "snd/controlC%d", controlnum);
	364	#ifndef MODULE
	365	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
	366	#endif
	367	return 0;
	368	}
	369
	370	static void __exit alsa_sound_exit(void)
	371	{
	372	short controlnum;
	373
	374	for (controlnum = 0; controlnum < cards_limit; controlnum++)
	375	devfs_remove("snd/controlC%d", controlnum);
	376
ecbcfe36	377	#ifdef CONFIG_SND_GENERIC_DRIVER
3ae5eaec	378	platform_driver_unregister(&snd_generic_driver);
ecbcfe36	379	#endif
1da177e4 LT	380	snd_info_minor_unregister();
1da177e4 LT	381	snd_info_done();
1da177e4 LT	382	if (unregister_chrdev(major, "alsa") != 0)
	383	snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
	384	devfs_remove("snd");
	385	}
	386
	387	module_init(alsa_sound_init)
	388	module_exit(alsa_sound_exit)
	389
	390	/* sound.c */
	391	EXPORT_SYMBOL(snd_major);
	392	EXPORT_SYMBOL(snd_ecards_limit);
	393	#if defined(CONFIG_KMOD)
	394	EXPORT_SYMBOL(snd_request_card);
	395	#endif
	396	EXPORT_SYMBOL(snd_register_device);
	397	EXPORT_SYMBOL(snd_unregister_device);
	398	#if defined(CONFIG_SND_OSSEMUL)
	399	EXPORT_SYMBOL(snd_register_oss_device);
	400	EXPORT_SYMBOL(snd_unregister_oss_device);
	401	#endif
	402	/* memory.c */
1da177e4 LT	403	EXPORT_SYMBOL(copy_to_user_fromio);
	404	EXPORT_SYMBOL(copy_from_user_toio);
	405	/* init.c */
	406	EXPORT_SYMBOL(snd_cards);
	407	#if defined(CONFIG_SND_MIXER_OSS) \|\| defined(CONFIG_SND_MIXER_OSS_MODULE)
	408	EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
	409	#endif
	410	EXPORT_SYMBOL(snd_card_new);
	411	EXPORT_SYMBOL(snd_card_disconnect);
	412	EXPORT_SYMBOL(snd_card_free);
	413	EXPORT_SYMBOL(snd_card_free_in_thread);
	414	EXPORT_SYMBOL(snd_card_register);
	415	EXPORT_SYMBOL(snd_component_add);
	416	EXPORT_SYMBOL(snd_card_file_add);
	417	EXPORT_SYMBOL(snd_card_file_remove);
ecbcfe36 TI	418	#ifdef CONFIG_SND_GENERIC_DRIVER
	419	EXPORT_SYMBOL(snd_card_set_generic_dev);
	420	#endif
1da177e4 LT	421	#ifdef CONFIG_PM
	422	EXPORT_SYMBOL(snd_power_wait);
	423	EXPORT_SYMBOL(snd_card_set_pm_callback);
ecbcfe36	424	#ifdef CONFIG_SND_GENERIC_DRIVER
1da177e4 LT	425	EXPORT_SYMBOL(snd_card_set_generic_pm_callback);
	426	#endif
	427	#ifdef CONFIG_PCI
	428	EXPORT_SYMBOL(snd_card_pci_suspend);
	429	EXPORT_SYMBOL(snd_card_pci_resume);
	430	#endif
	431	#endif
	432	/* device.c */
	433	EXPORT_SYMBOL(snd_device_new);
	434	EXPORT_SYMBOL(snd_device_register);
	435	EXPORT_SYMBOL(snd_device_free);
1da177e4	436	/* isadma.c */
276bd31c	437	#ifdef CONFIG_ISA_DMA_API
1da177e4 LT	438	EXPORT_SYMBOL(snd_dma_program);
	439	EXPORT_SYMBOL(snd_dma_disable);
	440	EXPORT_SYMBOL(snd_dma_pointer);
	441	#endif
	442	/* info.c */
	443	#ifdef CONFIG_PROC_FS
	444	EXPORT_SYMBOL(snd_seq_root);
	445	EXPORT_SYMBOL(snd_iprintf);
	446	EXPORT_SYMBOL(snd_info_get_line);
	447	EXPORT_SYMBOL(snd_info_get_str);
	448	EXPORT_SYMBOL(snd_info_create_module_entry);
	449	EXPORT_SYMBOL(snd_info_create_card_entry);
	450	EXPORT_SYMBOL(snd_info_free_entry);
	451	EXPORT_SYMBOL(snd_info_register);
	452	EXPORT_SYMBOL(snd_info_unregister);
	453	EXPORT_SYMBOL(snd_card_proc_new);
	454	#endif
	455	/* info_oss.c */
	456	#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
	457	EXPORT_SYMBOL(snd_oss_info_register);
	458	#endif
	459	/* control.c */
	460	EXPORT_SYMBOL(snd_ctl_new);
	461	EXPORT_SYMBOL(snd_ctl_new1);
	462	EXPORT_SYMBOL(snd_ctl_free_one);
	463	EXPORT_SYMBOL(snd_ctl_add);
	464	EXPORT_SYMBOL(snd_ctl_remove);
	465	EXPORT_SYMBOL(snd_ctl_remove_id);
	466	EXPORT_SYMBOL(snd_ctl_rename_id);
	467	EXPORT_SYMBOL(snd_ctl_find_numid);
	468	EXPORT_SYMBOL(snd_ctl_find_id);
	469	EXPORT_SYMBOL(snd_ctl_notify);
	470	EXPORT_SYMBOL(snd_ctl_register_ioctl);
	471	EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
	472	#ifdef CONFIG_COMPAT
	473	EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
	474	EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
	475	#endif
	476	EXPORT_SYMBOL(snd_ctl_elem_read);
	477	EXPORT_SYMBOL(snd_ctl_elem_write);
	478	/* misc.c */
b1d5776d	479	EXPORT_SYMBOL(release_and_free_resource);
1da177e4 LT	480	#ifdef CONFIG_SND_VERBOSE_PRINTK
	481	EXPORT_SYMBOL(snd_verbose_printk);
	482	#endif
	483	#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
	484	EXPORT_SYMBOL(snd_verbose_printd);
1da177e4	485	#endif