[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 snd_minor *snd_minors[SNDRV_OS_MINORS];
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 */

/**
 * 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;
	down(&sound_mutex);
	mreg = snd_minors[minor];
	if (mreg && mreg->type == type)
		private_data = mreg->private_data;
	else
		private_data = NULL;
	up(&sound_mutex);
	return private_data;
}

static int snd_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct snd_minor *mptr = NULL;
	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_KMOD
		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;
}

static 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:
		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;
}
#endif

/**
 * 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
 * @private_data: user pointer for f_ops->open()
 * @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, void *private_data,
			const char *name)
{
	int minor;
	struct snd_minor *preg;
	struct device *device = NULL;

	snd_assert(name, return -EINVAL);
	preg = kmalloc(sizeof(struct snd_minor) + strlen(name) + 1, 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;
	strcpy(preg->name, name);
	down(&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) {
		up(&sound_mutex);
		kfree(preg);
		return minor;
	}
	snd_minors[minor] = preg;
	if (type != SNDRV_DEVICE_TYPE_CONTROL || preg->card >= 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 cardnum, minor;
	struct snd_minor *mptr;

	cardnum = card ? card->number : -1;
	down(&sound_mutex);
	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
		if ((mptr = snd_minors[minor]) != NULL &&
		    mptr->type == type &&
		    mptr->card == cardnum &&
		    mptr->device == dev)
			break;
	if (minor == ARRAY_SIZE(snd_minors)) {
		up(&sound_mutex);
		return -EINVAL;
	}

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

	snd_minors[minor] = NULL;
	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 minor;
	struct snd_minor *mptr;

	down(&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));
	}
	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;

	snd_major = major;
	snd_ecards_limit = cards_limit;
	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);
EXPORT_SYMBOL(snd_lookup_minor_data);
#if defined(CONFIG_SND_OSSEMUL)
EXPORT_SYMBOL(snd_register_oss_device);
EXPORT_SYMBOL(snd_unregister_oss_device);
EXPORT_SYMBOL(snd_lookup_oss_minor_data);
#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
6983b724	62	static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
1da177e4 LT	63	static DECLARE_MUTEX(sound_mutex);
1da177e4 LT	64
619e666b	65	extern struct class *sound_class;
1da177e4 LT	66
	67
	68	#ifdef CONFIG_KMOD
	69
	70	/**
	71	* snd_request_card - try to load the card module
	72	* @card: the card number
	73	*
	74	* Tries to load the module "snd-card-X" for the given card number
	75	* via KMOD. Returns immediately if already loaded.
	76	*/
	77	void snd_request_card(int card)
	78	{
	79	int locked;
	80
	81	if (! current->fs->root)
	82	return;
	83	read_lock(&snd_card_rwlock);
	84	locked = snd_cards_lock & (1 << card);
	85	read_unlock(&snd_card_rwlock);
	86	if (locked)
	87	return;
	88	if (card < 0 \|\| card >= cards_limit)
	89	return;
	90	request_module("snd-card-%i", card);
	91	}
	92
	93	static void snd_request_other(int minor)
	94	{
	95	char *str;
	96
	97	if (! current->fs->root)
	98	return;
	99	switch (minor) {
	100	case SNDRV_MINOR_SEQUENCER: str = "snd-seq"; break;
	101	case SNDRV_MINOR_TIMER: str = "snd-timer"; break;
	102	default: return;
	103	}
	104	request_module(str);
	105	}
	106
	107	#endif /* request_module support */
	108
f87135f5 CL	109	/**
	110	* snd_lookup_minor_data - get user data of a registered device
	111	* @minor: the minor number
	112	* @type: device type (SNDRV_DEVICE_TYPE_XXX)
	113	*
	114	* Checks that a minor device with the specified type is registered, and returns
	115	* its user data pointer.
	116	*/
	117	void *snd_lookup_minor_data(unsigned int minor, int type)
	118	{
	119	struct snd_minor *mreg;
	120	void *private_data;
	121
	122	if (minor > ARRAY_SIZE(snd_minors))
	123	return NULL;
	124	down(&sound_mutex);
	125	mreg = snd_minors[minor];
	126	if (mreg && mreg->type == type)
	127	private_data = mreg->private_data;
	128	else
	129	private_data = NULL;
	130	up(&sound_mutex);
	131	return private_data;
	132	}
	133
1da177e4 LT	134	static int snd_open(struct inode inode, struct file file)
1da177e4 LT	135	{
332682b1	136	unsigned int minor = iminor(inode);
512bbd6a	137	struct snd_minor *mptr = NULL;
1da177e4 LT	138	struct file_operations *old_fops;
	139	int err = 0;
	140
332682b1 CL	141	if (minor > ARRAY_SIZE(snd_minors))
	142	return -ENODEV;
	143	mptr = snd_minors[minor];
	144	if (mptr == NULL) {
1da177e4	145	#ifdef CONFIG_KMOD
332682b1 CL	146	int dev = SNDRV_MINOR_DEVICE(minor);
	147	if (dev == SNDRV_MINOR_CONTROL) {
	148	/* /dev/aloadC? */
	149	int card = SNDRV_MINOR_CARD(minor);
1da177e4	150	if (snd_cards[card] == NULL)
332682b1 CL	151	snd_request_card(card);
	152	} else if (dev == SNDRV_MINOR_GLOBAL) {
	153	/* /dev/aloadSEQ */
1da177e4	154	snd_request_other(minor);
332682b1 CL	155	}
	156	#ifndef CONFIG_SND_DYNAMIC_MINORS
	157	/* /dev/snd/{controlC?,seq} */
	158	mptr = snd_minors[minor];
	159	if (mptr == NULL)
	160	#endif
1da177e4	161	#endif
332682b1	162	return -ENODEV;
1da177e4	163	}
1da177e4 LT	164	old_fops = file->f_op;
	165	file->f_op = fops_get(mptr->f_ops);
	166	if (file->f_op->open)
	167	err = file->f_op->open(inode, file);
	168	if (err) {
	169	fops_put(file->f_op);
	170	file->f_op = fops_get(old_fops);
	171	}
	172	fops_put(old_fops);
	173	return err;
	174	}
	175
	176	static struct file_operations snd_fops =
	177	{
	178	.owner = THIS_MODULE,
	179	.open = snd_open
	180	};
	181
332682b1 CL	182	#ifdef CONFIG_SND_DYNAMIC_MINORS
	183	static int snd_find_free_minor(void)
	184	{
	185	int minor;
	186
	187	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
	188	/* skip minors still used statically for autoloading devices */
	189	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL \|\|
	190	minor == SNDRV_MINOR_SEQUENCER)
	191	continue;
	192	if (!snd_minors[minor])
	193	return minor;
	194	}
	195	return -EBUSY;
	196	}
	197	#else
512bbd6a	198	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	199	{
	200	int minor;
	201
	202	switch (type) {
	203	case SNDRV_DEVICE_TYPE_SEQUENCER:
	204	case SNDRV_DEVICE_TYPE_TIMER:
	205	minor = type;
	206	break;
	207	case SNDRV_DEVICE_TYPE_CONTROL:
	208	snd_assert(card != NULL, return -EINVAL);
	209	minor = SNDRV_MINOR(card->number, type);
	210	break;
	211	case SNDRV_DEVICE_TYPE_HWDEP:
	212	case SNDRV_DEVICE_TYPE_RAWMIDI:
	213	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	214	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	215	snd_assert(card != NULL, return -EINVAL);
	216	minor = SNDRV_MINOR(card->number, type + dev);
	217	break;
	218	default:
	219	return -EINVAL;
	220	}
	221	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	222	return minor;
	223	}
332682b1	224	#endif
1da177e4 LT	225
	226	/**
	227	* snd_register_device - Register the ALSA device file for the card
	228	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	229	* @card: the card instance
	230	* @dev: the device index
2af677fc	231	* @f_ops: the file operations
f87135f5	232	* @private_data: user pointer for f_ops->open()
1da177e4 LT	233	* @name: the device file name
	234	*
	235	* Registers an ALSA device file for the given card.
	236	* The operators have to be set in reg parameter.
	237	*
	238	* Retrurns zero if successful, or a negative error code on failure.
	239	*/
2af677fc	240	int snd_register_device(int type, struct snd_card *card, int dev,
f87135f5 CL	241	struct file_operations f_ops, void private_data,
f87135f5 CL	242	const char *name)
1da177e4	243	{
332682b1	244	int minor;
512bbd6a	245	struct snd_minor *preg;
1da177e4 LT	246	struct device *device = NULL;
1da177e4 LT	247
1da177e4	248	snd_assert(name, return -EINVAL);
6983b724	249	preg = kmalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
1da177e4 LT	250	if (preg == NULL)
1da177e4 LT	251	return -ENOMEM;
2af677fc	252	preg->type = type;
6983b724	253	preg->card = card ? card->number : -1;
1da177e4	254	preg->device = dev;
2af677fc	255	preg->f_ops = f_ops;
f87135f5	256	preg->private_data = private_data;
1da177e4 LT	257	strcpy(preg->name, name);
1da177e4 LT	258	down(&sound_mutex);
332682b1 CL	259	#ifdef CONFIG_SND_DYNAMIC_MINORS
	260	minor = snd_find_free_minor();
	261	#else
	262	minor = snd_kernel_minor(type, card, dev);
	263	if (minor >= 0 && snd_minors[minor])
	264	minor = -EBUSY;
	265	#endif
	266	if (minor < 0) {
1da177e4 LT	267	up(&sound_mutex);
1da177e4 LT	268	kfree(preg);
332682b1	269	return minor;
1da177e4	270	}
6983b724 CL	271	snd_minors[minor] = preg;
6983b724 CL	272	if (type != SNDRV_DEVICE_TYPE_CONTROL \|\| preg->card >= cards_limit)
1da177e4 LT	273	devfs_mk_cdev(MKDEV(major, minor), S_IFCHR \| device_mode, "snd/%s", name);
	274	if (card)
	275	device = card->dev;
53f46542	276	class_device_create(sound_class, NULL, MKDEV(major, minor), device, "%s", name);
1da177e4 LT	277
	278	up(&sound_mutex);
	279	return 0;
	280	}
	281
	282	/**
	283	* snd_unregister_device - unregister the device on the given card
	284	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	285	* @card: the card instance
	286	* @dev: the device index
	287	*
	288	* Unregisters the device file already registered via
	289	* snd_register_device().
	290	*
	291	* Returns zero if sucecessful, or a negative error code on failure
	292	*/
512bbd6a	293	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4	294	{
f87135f5	295	int cardnum, minor;
512bbd6a	296	struct snd_minor *mptr;
1da177e4	297
f87135f5	298	cardnum = card ? card->number : -1;
1da177e4	299	down(&sound_mutex);
f87135f5 CL	300	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
	301	if ((mptr = snd_minors[minor]) != NULL &&
	302	mptr->type == type &&
	303	mptr->card == cardnum &&
	304	mptr->device == dev)
	305	break;
	306	if (minor == ARRAY_SIZE(snd_minors)) {
1da177e4 LT	307	up(&sound_mutex);
	308	return -EINVAL;
	309	}
	310
6983b724 CL	311	if (mptr->type != SNDRV_DEVICE_TYPE_CONTROL \|\|
6983b724 CL	312	mptr->card >= cards_limit) /* created in sound.c */
1da177e4	313	devfs_remove("snd/%s", mptr->name);
619e666b	314	class_device_destroy(sound_class, MKDEV(major, minor));
1da177e4	315
6983b724	316	snd_minors[minor] = NULL;
1da177e4 LT	317	up(&sound_mutex);
	318	kfree(mptr);
	319	return 0;
	320	}
	321
	322	/*
	323	* INFO PART
	324	*/
	325
512bbd6a	326	static struct snd_info_entry *snd_minor_info_entry = NULL;
1da177e4	327
2af677fc CL	328	static const char *snd_device_type_name(int type)
	329	{
	330	switch (type) {
	331	case SNDRV_DEVICE_TYPE_CONTROL:
	332	return "control";
	333	case SNDRV_DEVICE_TYPE_HWDEP:
	334	return "hardware dependent";
	335	case SNDRV_DEVICE_TYPE_RAWMIDI:
	336	return "raw midi";
	337	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	338	return "digital audio playback";
	339	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	340	return "digital audio capture";
	341	case SNDRV_DEVICE_TYPE_SEQUENCER:
	342	return "sequencer";
	343	case SNDRV_DEVICE_TYPE_TIMER:
	344	return "timer";
	345	default:
	346	return "?";
	347	}
	348	}
	349
512bbd6a	350	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	351	{
6983b724	352	int minor;
512bbd6a	353	struct snd_minor *mptr;
1da177e4 LT	354
1da177e4 LT	355	down(&sound_mutex);
6983b724 CL	356	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	357	if (!(mptr = snd_minors[minor]))
	358	continue;
	359	if (mptr->card >= 0) {
	360	if (mptr->device >= 0)
d001544d	361	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	362	minor, mptr->card, mptr->device,
	363	snd_device_type_name(mptr->type));
	364	else
d001544d	365	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	366	minor, mptr->card,
	367	snd_device_type_name(mptr->type));
	368	} else
d001544d	369	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	370	snd_device_type_name(mptr->type));
1da177e4 LT	371	}
	372	up(&sound_mutex);
	373	}
	374
	375	int __init snd_minor_info_init(void)
	376	{
512bbd6a	377	struct snd_info_entry *entry;
1da177e4 LT	378
	379	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	380	if (entry) {
	381	entry->c.text.read_size = PAGE_SIZE;
	382	entry->c.text.read = snd_minor_info_read;
	383	if (snd_info_register(entry) < 0) {
	384	snd_info_free_entry(entry);
	385	entry = NULL;
	386	}
	387	}
	388	snd_minor_info_entry = entry;
	389	return 0;
	390	}
	391
	392	int __exit snd_minor_info_done(void)
	393	{
	394	if (snd_minor_info_entry)
	395	snd_info_unregister(snd_minor_info_entry);
	396	return 0;
	397	}
	398
	399	/*
	400	* INIT PART
	401	*/
	402
	403	static int __init alsa_sound_init(void)
	404	{
	405	short controlnum;
1da177e4 LT	406
	407	snd_major = major;
	408	snd_ecards_limit = cards_limit;
1da177e4 LT	409	devfs_mk_dir("snd");
	410	if (register_chrdev(major, "alsa", &snd_fops)) {
	411	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
	412	devfs_remove("snd");
	413	return -EIO;
	414	}
1da177e4	415	if (snd_info_init() < 0) {
1da177e4 LT	416	unregister_chrdev(major, "alsa");
	417	devfs_remove("snd");
	418	return -ENOMEM;
	419	}
	420	snd_info_minor_register();
	421	for (controlnum = 0; controlnum < cards_limit; controlnum++)
	422	devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR \| device_mode, "snd/controlC%d", controlnum);
	423	#ifndef MODULE
	424	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
	425	#endif
	426	return 0;
	427	}
	428
	429	static void __exit alsa_sound_exit(void)
	430	{
	431	short controlnum;
	432
	433	for (controlnum = 0; controlnum < cards_limit; controlnum++)
	434	devfs_remove("snd/controlC%d", controlnum);
	435
	436	snd_info_minor_unregister();
	437	snd_info_done();
1da177e4 LT	438	if (unregister_chrdev(major, "alsa") != 0)
	439	snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
	440	devfs_remove("snd");
	441	}
	442
	443	module_init(alsa_sound_init)
	444	module_exit(alsa_sound_exit)
	445
	446	/* sound.c */
	447	EXPORT_SYMBOL(snd_major);
	448	EXPORT_SYMBOL(snd_ecards_limit);
	449	#if defined(CONFIG_KMOD)
	450	EXPORT_SYMBOL(snd_request_card);
	451	#endif
	452	EXPORT_SYMBOL(snd_register_device);
	453	EXPORT_SYMBOL(snd_unregister_device);
f87135f5	454	EXPORT_SYMBOL(snd_lookup_minor_data);
1da177e4 LT	455	#if defined(CONFIG_SND_OSSEMUL)
	456	EXPORT_SYMBOL(snd_register_oss_device);
	457	EXPORT_SYMBOL(snd_unregister_oss_device);
f87135f5	458	EXPORT_SYMBOL(snd_lookup_oss_minor_data);
1da177e4 LT	459	#endif
1da177e4 LT	460	/* memory.c */
1da177e4 LT	461	EXPORT_SYMBOL(copy_to_user_fromio);
	462	EXPORT_SYMBOL(copy_from_user_toio);
	463	/* init.c */
	464	EXPORT_SYMBOL(snd_cards);
	465	#if defined(CONFIG_SND_MIXER_OSS) \|\| defined(CONFIG_SND_MIXER_OSS_MODULE)
	466	EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
	467	#endif
	468	EXPORT_SYMBOL(snd_card_new);
	469	EXPORT_SYMBOL(snd_card_disconnect);
	470	EXPORT_SYMBOL(snd_card_free);
	471	EXPORT_SYMBOL(snd_card_free_in_thread);
	472	EXPORT_SYMBOL(snd_card_register);
	473	EXPORT_SYMBOL(snd_component_add);
	474	EXPORT_SYMBOL(snd_card_file_add);
	475	EXPORT_SYMBOL(snd_card_file_remove);
	476	#ifdef CONFIG_PM
	477	EXPORT_SYMBOL(snd_power_wait);
1da177e4 LT	478	#endif
	479	/* device.c */
	480	EXPORT_SYMBOL(snd_device_new);
	481	EXPORT_SYMBOL(snd_device_register);
	482	EXPORT_SYMBOL(snd_device_free);
1da177e4	483	/* isadma.c */
276bd31c	484	#ifdef CONFIG_ISA_DMA_API
1da177e4 LT	485	EXPORT_SYMBOL(snd_dma_program);
	486	EXPORT_SYMBOL(snd_dma_disable);
	487	EXPORT_SYMBOL(snd_dma_pointer);
	488	#endif
	489	/* info.c */
	490	#ifdef CONFIG_PROC_FS
	491	EXPORT_SYMBOL(snd_seq_root);
	492	EXPORT_SYMBOL(snd_iprintf);
	493	EXPORT_SYMBOL(snd_info_get_line);
	494	EXPORT_SYMBOL(snd_info_get_str);
	495	EXPORT_SYMBOL(snd_info_create_module_entry);
	496	EXPORT_SYMBOL(snd_info_create_card_entry);
	497	EXPORT_SYMBOL(snd_info_free_entry);
	498	EXPORT_SYMBOL(snd_info_register);
	499	EXPORT_SYMBOL(snd_info_unregister);
	500	EXPORT_SYMBOL(snd_card_proc_new);
	501	#endif
	502	/* info_oss.c */
	503	#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
	504	EXPORT_SYMBOL(snd_oss_info_register);
	505	#endif
	506	/* control.c */
	507	EXPORT_SYMBOL(snd_ctl_new);
	508	EXPORT_SYMBOL(snd_ctl_new1);
	509	EXPORT_SYMBOL(snd_ctl_free_one);
	510	EXPORT_SYMBOL(snd_ctl_add);
	511	EXPORT_SYMBOL(snd_ctl_remove);
	512	EXPORT_SYMBOL(snd_ctl_remove_id);
	513	EXPORT_SYMBOL(snd_ctl_rename_id);
	514	EXPORT_SYMBOL(snd_ctl_find_numid);
	515	EXPORT_SYMBOL(snd_ctl_find_id);
	516	EXPORT_SYMBOL(snd_ctl_notify);
	517	EXPORT_SYMBOL(snd_ctl_register_ioctl);
	518	EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
	519	#ifdef CONFIG_COMPAT
	520	EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
	521	EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
	522	#endif
	523	EXPORT_SYMBOL(snd_ctl_elem_read);
	524	EXPORT_SYMBOL(snd_ctl_elem_write);
	525	/* misc.c */
b1d5776d	526	EXPORT_SYMBOL(release_and_free_resource);
1da177e4 LT	527	#ifdef CONFIG_SND_VERBOSE_PRINTK
	528	EXPORT_SYMBOL(snd_verbose_printk);
	529	#endif
	530	#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
	531	EXPORT_SYMBOL(snd_verbose_printd);
1da177e4	532	#endif