[linux-2.6-block.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/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/devfs_fs_kernel.h>
#include <linux/mutex.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 DEFINE_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;
	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;
}

static int snd_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct snd_minor *mptr = NULL;
	const struct file_operations *old_fops;
	int err = 0;

	if (minor >= ARRAY_SIZE(snd_minors))
		return -ENODEV;
	mptr = snd_minors[minor];
	if (mptr == NULL) {
#ifdef CONFIG_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,
			const 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);
	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;
	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);

	mutex_unlock(&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;
	mutex_lock(&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)) {
		mutex_unlock(&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;
	mutex_unlock(&sound_mutex);
	kfree(mptr);
	return 0;
}

#ifdef CONFIG_PROC_FS
/*
 *  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;

	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_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;
}
#endif /* CONFIG_PROC_FS */

/*
 *  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>
9a1a2a1d	26	#include <linux/device.h>
1da177e4 LT	27	#include <linux/moduleparam.h>
	28	#include <sound/core.h>
	29	#include <sound/minors.h>
	30	#include <sound/info.h>
	31	#include <sound/version.h>
	32	#include <sound/control.h>
	33	#include <sound/initval.h>
	34	#include <linux/kmod.h>
	35	#include <linux/devfs_fs_kernel.h>
1a60d4c5	36	#include <linux/mutex.h>
1da177e4 LT	37
	38	#define SNDRV_OS_MINORS 256
	39
	40	static int major = CONFIG_SND_MAJOR;
	41	int snd_major;
	42	static int cards_limit = 1;
	43	static int device_mode = S_IFCHR \| S_IRUGO \| S_IWUGO;
	44
	45	MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
	46	MODULE_DESCRIPTION("Advanced Linux Sound Architecture driver for soundcards.");
	47	MODULE_LICENSE("GPL");
	48	module_param(major, int, 0444);
	49	MODULE_PARM_DESC(major, "Major # for sound driver.");
	50	module_param(cards_limit, int, 0444);
	51	MODULE_PARM_DESC(cards_limit, "Count of auto-loadable soundcards.");
	52	#ifdef CONFIG_DEVFS_FS
	53	module_param(device_mode, int, 0444);
	54	MODULE_PARM_DESC(device_mode, "Device file permission mask for devfs.");
	55	#endif
	56	MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
	57
	58	/* this one holds the actual max. card number currently available.
	59	* as default, it's identical with cards_limit option. when more
	60	* modules are loaded manually, this limit number increases, too.
	61	*/
	62	int snd_ecards_limit;
	63
6983b724	64	static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
1a60d4c5	65	static DEFINE_MUTEX(sound_mutex);
1da177e4	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
f87135f5 CL	111	/**
	112	* snd_lookup_minor_data - get user data of a registered device
	113	* @minor: the minor number
	114	* @type: device type (SNDRV_DEVICE_TYPE_XXX)
	115	*
	116	* Checks that a minor device with the specified type is registered, and returns
	117	* its user data pointer.
	118	*/
	119	void *snd_lookup_minor_data(unsigned int minor, int type)
	120	{
	121	struct snd_minor *mreg;
	122	void *private_data;
	123
3a63e444	124	if (minor >= ARRAY_SIZE(snd_minors))
f87135f5	125	return NULL;
1a60d4c5	126	mutex_lock(&sound_mutex);
f87135f5 CL	127	mreg = snd_minors[minor];
	128	if (mreg && mreg->type == type)
	129	private_data = mreg->private_data;
	130	else
	131	private_data = NULL;
1a60d4c5	132	mutex_unlock(&sound_mutex);
f87135f5 CL	133	return private_data;
	134	}
	135
1da177e4 LT	136	static int snd_open(struct inode inode, struct file file)
1da177e4 LT	137	{
332682b1	138	unsigned int minor = iminor(inode);
512bbd6a	139	struct snd_minor *mptr = NULL;
99ac48f5	140	const struct file_operations *old_fops;
1da177e4 LT	141	int err = 0;
1da177e4 LT	142
3a63e444	143	if (minor >= ARRAY_SIZE(snd_minors))
332682b1 CL	144	return -ENODEV;
	145	mptr = snd_minors[minor];
	146	if (mptr == NULL) {
1da177e4	147	#ifdef CONFIG_KMOD
332682b1 CL	148	int dev = SNDRV_MINOR_DEVICE(minor);
	149	if (dev == SNDRV_MINOR_CONTROL) {
	150	/* /dev/aloadC? */
	151	int card = SNDRV_MINOR_CARD(minor);
1da177e4	152	if (snd_cards[card] == NULL)
332682b1 CL	153	snd_request_card(card);
	154	} else if (dev == SNDRV_MINOR_GLOBAL) {
	155	/* /dev/aloadSEQ */
1da177e4	156	snd_request_other(minor);
332682b1 CL	157	}
	158	#ifndef CONFIG_SND_DYNAMIC_MINORS
	159	/* /dev/snd/{controlC?,seq} */
	160	mptr = snd_minors[minor];
	161	if (mptr == NULL)
	162	#endif
1da177e4	163	#endif
332682b1	164	return -ENODEV;
1da177e4	165	}
1da177e4 LT	166	old_fops = file->f_op;
	167	file->f_op = fops_get(mptr->f_ops);
	168	if (file->f_op->open)
	169	err = file->f_op->open(inode, file);
	170	if (err) {
	171	fops_put(file->f_op);
	172	file->f_op = fops_get(old_fops);
	173	}
	174	fops_put(old_fops);
	175	return err;
	176	}
	177
	178	static struct file_operations snd_fops =
	179	{
	180	.owner = THIS_MODULE,
	181	.open = snd_open
	182	};
	183
332682b1 CL	184	#ifdef CONFIG_SND_DYNAMIC_MINORS
	185	static int snd_find_free_minor(void)
	186	{
	187	int minor;
	188
	189	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor) {
	190	/* skip minors still used statically for autoloading devices */
	191	if (SNDRV_MINOR_DEVICE(minor) == SNDRV_MINOR_CONTROL \|\|
	192	minor == SNDRV_MINOR_SEQUENCER)
	193	continue;
	194	if (!snd_minors[minor])
	195	return minor;
	196	}
	197	return -EBUSY;
	198	}
	199	#else
512bbd6a	200	static int snd_kernel_minor(int type, struct snd_card *card, int dev)
1da177e4 LT	201	{
	202	int minor;
	203
	204	switch (type) {
	205	case SNDRV_DEVICE_TYPE_SEQUENCER:
	206	case SNDRV_DEVICE_TYPE_TIMER:
	207	minor = type;
	208	break;
	209	case SNDRV_DEVICE_TYPE_CONTROL:
	210	snd_assert(card != NULL, return -EINVAL);
	211	minor = SNDRV_MINOR(card->number, type);
	212	break;
	213	case SNDRV_DEVICE_TYPE_HWDEP:
	214	case SNDRV_DEVICE_TYPE_RAWMIDI:
	215	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	216	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	217	snd_assert(card != NULL, return -EINVAL);
	218	minor = SNDRV_MINOR(card->number, type + dev);
	219	break;
	220	default:
	221	return -EINVAL;
	222	}
	223	snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
	224	return minor;
	225	}
332682b1	226	#endif
1da177e4 LT	227
	228	/**
	229	* snd_register_device - Register the ALSA device file for the card
	230	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	231	* @card: the card instance
	232	* @dev: the device index
2af677fc	233	* @f_ops: the file operations
f87135f5	234	* @private_data: user pointer for f_ops->open()
1da177e4 LT	235	* @name: the device file name
	236	*
	237	* Registers an ALSA device file for the given card.
	238	* The operators have to be set in reg parameter.
	239	*
	240	* Retrurns zero if successful, or a negative error code on failure.
	241	*/
2af677fc	242	int snd_register_device(int type, struct snd_card *card, int dev,
99ac48f5	243	const struct file_operations f_ops, void private_data,
f87135f5	244	const char *name)
1da177e4	245	{
332682b1	246	int minor;
512bbd6a	247	struct snd_minor *preg;
1da177e4 LT	248	struct device *device = NULL;
1da177e4 LT	249
1da177e4	250	snd_assert(name, return -EINVAL);
6983b724	251	preg = kmalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
1da177e4 LT	252	if (preg == NULL)
1da177e4 LT	253	return -ENOMEM;
2af677fc	254	preg->type = type;
6983b724	255	preg->card = card ? card->number : -1;
1da177e4	256	preg->device = dev;
2af677fc	257	preg->f_ops = f_ops;
f87135f5	258	preg->private_data = private_data;
1da177e4	259	strcpy(preg->name, name);
1a60d4c5	260	mutex_lock(&sound_mutex);
332682b1 CL	261	#ifdef CONFIG_SND_DYNAMIC_MINORS
	262	minor = snd_find_free_minor();
	263	#else
	264	minor = snd_kernel_minor(type, card, dev);
	265	if (minor >= 0 && snd_minors[minor])
	266	minor = -EBUSY;
	267	#endif
	268	if (minor < 0) {
1a60d4c5	269	mutex_unlock(&sound_mutex);
1da177e4	270	kfree(preg);
332682b1	271	return minor;
1da177e4	272	}
6983b724 CL	273	snd_minors[minor] = preg;
6983b724 CL	274	if (type != SNDRV_DEVICE_TYPE_CONTROL \|\| preg->card >= cards_limit)
1da177e4	275	devfs_mk_cdev(MKDEV(major, minor), S_IFCHR \| device_mode, "snd/%s", name);
3e23c658	276	if (card)
1da177e4	277	device = card->dev;
3e23c658	278	class_device_create(sound_class, NULL, MKDEV(major, minor), device, "%s", name);
1da177e4	279
1a60d4c5	280	mutex_unlock(&sound_mutex);
1da177e4 LT	281	return 0;
	282	}
	283
	284	/**
	285	* snd_unregister_device - unregister the device on the given card
	286	* @type: the device type, SNDRV_DEVICE_TYPE_XXX
	287	* @card: the card instance
	288	* @dev: the device index
	289	*
	290	* Unregisters the device file already registered via
	291	* snd_register_device().
	292	*
	293	* Returns zero if sucecessful, or a negative error code on failure
	294	*/
512bbd6a	295	int snd_unregister_device(int type, struct snd_card *card, int dev)
1da177e4	296	{
f87135f5	297	int cardnum, minor;
512bbd6a	298	struct snd_minor *mptr;
1da177e4	299
f87135f5	300	cardnum = card ? card->number : -1;
1a60d4c5	301	mutex_lock(&sound_mutex);
f87135f5 CL	302	for (minor = 0; minor < ARRAY_SIZE(snd_minors); ++minor)
	303	if ((mptr = snd_minors[minor]) != NULL &&
	304	mptr->type == type &&
	305	mptr->card == cardnum &&
	306	mptr->device == dev)
	307	break;
	308	if (minor == ARRAY_SIZE(snd_minors)) {
1a60d4c5	309	mutex_unlock(&sound_mutex);
1da177e4 LT	310	return -EINVAL;
	311	}
	312
6983b724 CL	313	if (mptr->type != SNDRV_DEVICE_TYPE_CONTROL \|\|
6983b724 CL	314	mptr->card >= cards_limit) /* created in sound.c */
1da177e4	315	devfs_remove("snd/%s", mptr->name);
619e666b	316	class_device_destroy(sound_class, MKDEV(major, minor));
1da177e4	317
6983b724	318	snd_minors[minor] = NULL;
1a60d4c5	319	mutex_unlock(&sound_mutex);
1da177e4 LT	320	kfree(mptr);
	321	return 0;
	322	}
	323
e28563cc	324	#ifdef CONFIG_PROC_FS
1da177e4 LT	325	/*
	326	* INFO PART
	327	*/
	328
512bbd6a	329	static struct snd_info_entry *snd_minor_info_entry = NULL;
1da177e4	330
2af677fc CL	331	static const char *snd_device_type_name(int type)
	332	{
	333	switch (type) {
	334	case SNDRV_DEVICE_TYPE_CONTROL:
	335	return "control";
	336	case SNDRV_DEVICE_TYPE_HWDEP:
	337	return "hardware dependent";
	338	case SNDRV_DEVICE_TYPE_RAWMIDI:
	339	return "raw midi";
	340	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
	341	return "digital audio playback";
	342	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
	343	return "digital audio capture";
	344	case SNDRV_DEVICE_TYPE_SEQUENCER:
	345	return "sequencer";
	346	case SNDRV_DEVICE_TYPE_TIMER:
	347	return "timer";
	348	default:
	349	return "?";
	350	}
	351	}
	352
512bbd6a	353	static void snd_minor_info_read(struct snd_info_entry entry, struct snd_info_buffer buffer)
1da177e4	354	{
6983b724	355	int minor;
512bbd6a	356	struct snd_minor *mptr;
1da177e4	357
1a60d4c5	358	mutex_lock(&sound_mutex);
6983b724 CL	359	for (minor = 0; minor < SNDRV_OS_MINORS; ++minor) {
	360	if (!(mptr = snd_minors[minor]))
	361	continue;
	362	if (mptr->card >= 0) {
	363	if (mptr->device >= 0)
d001544d	364	snd_iprintf(buffer, "%3i: [%2i-%2i]: %s\n",
6983b724 CL	365	minor, mptr->card, mptr->device,
	366	snd_device_type_name(mptr->type));
	367	else
d001544d	368	snd_iprintf(buffer, "%3i: [%2i] : %s\n",
6983b724 CL	369	minor, mptr->card,
	370	snd_device_type_name(mptr->type));
	371	} else
d001544d	372	snd_iprintf(buffer, "%3i: : %s\n", minor,
6983b724	373	snd_device_type_name(mptr->type));
1da177e4	374	}
1a60d4c5	375	mutex_unlock(&sound_mutex);
1da177e4 LT	376	}
	377
	378	int __init snd_minor_info_init(void)
	379	{
512bbd6a	380	struct snd_info_entry *entry;
1da177e4 LT	381
	382	entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
	383	if (entry) {
	384	entry->c.text.read_size = PAGE_SIZE;
	385	entry->c.text.read = snd_minor_info_read;
	386	if (snd_info_register(entry) < 0) {
	387	snd_info_free_entry(entry);
	388	entry = NULL;
	389	}
	390	}
	391	snd_minor_info_entry = entry;
	392	return 0;
	393	}
	394
	395	int __exit snd_minor_info_done(void)
	396	{
	397	if (snd_minor_info_entry)
	398	snd_info_unregister(snd_minor_info_entry);
	399	return 0;
	400	}
e28563cc	401	#endif /* CONFIG_PROC_FS */
1da177e4 LT	402
	403	/*
	404	* INIT PART
	405	*/
	406
	407	static int __init alsa_sound_init(void)
	408	{
	409	short controlnum;
1da177e4 LT	410
	411	snd_major = major;
	412	snd_ecards_limit = cards_limit;
1da177e4 LT	413	devfs_mk_dir("snd");
	414	if (register_chrdev(major, "alsa", &snd_fops)) {
	415	snd_printk(KERN_ERR "unable to register native major device number %d\n", major);
	416	devfs_remove("snd");
	417	return -EIO;
	418	}
1da177e4	419	if (snd_info_init() < 0) {
1da177e4 LT	420	unregister_chrdev(major, "alsa");
	421	devfs_remove("snd");
	422	return -ENOMEM;
	423	}
	424	snd_info_minor_register();
	425	for (controlnum = 0; controlnum < cards_limit; controlnum++)
	426	devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR \| device_mode, "snd/controlC%d", controlnum);
	427	#ifndef MODULE
	428	printk(KERN_INFO "Advanced Linux Sound Architecture Driver Version " CONFIG_SND_VERSION CONFIG_SND_DATE ".\n");
	429	#endif
	430	return 0;
	431	}
	432
	433	static void __exit alsa_sound_exit(void)
	434	{
	435	short controlnum;
	436
	437	for (controlnum = 0; controlnum < cards_limit; controlnum++)
	438	devfs_remove("snd/controlC%d", controlnum);
	439
	440	snd_info_minor_unregister();
	441	snd_info_done();
1da177e4 LT	442	if (unregister_chrdev(major, "alsa") != 0)
	443	snd_printk(KERN_ERR "unable to unregister major device number %d\n", major);
	444	devfs_remove("snd");
	445	}
	446
	447	module_init(alsa_sound_init)
	448	module_exit(alsa_sound_exit)
	449
	450	/* sound.c */
	451	EXPORT_SYMBOL(snd_major);
	452	EXPORT_SYMBOL(snd_ecards_limit);
	453	#if defined(CONFIG_KMOD)
	454	EXPORT_SYMBOL(snd_request_card);
	455	#endif
	456	EXPORT_SYMBOL(snd_register_device);
	457	EXPORT_SYMBOL(snd_unregister_device);
f87135f5	458	EXPORT_SYMBOL(snd_lookup_minor_data);
1da177e4 LT	459	#if defined(CONFIG_SND_OSSEMUL)
	460	EXPORT_SYMBOL(snd_register_oss_device);
	461	EXPORT_SYMBOL(snd_unregister_oss_device);
f87135f5	462	EXPORT_SYMBOL(snd_lookup_oss_minor_data);
1da177e4 LT	463	#endif
1da177e4 LT	464	/* memory.c */
1da177e4 LT	465	EXPORT_SYMBOL(copy_to_user_fromio);
	466	EXPORT_SYMBOL(copy_from_user_toio);
	467	/* init.c */
	468	EXPORT_SYMBOL(snd_cards);
	469	#if defined(CONFIG_SND_MIXER_OSS) \|\| defined(CONFIG_SND_MIXER_OSS_MODULE)
	470	EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
	471	#endif
	472	EXPORT_SYMBOL(snd_card_new);
	473	EXPORT_SYMBOL(snd_card_disconnect);
	474	EXPORT_SYMBOL(snd_card_free);
	475	EXPORT_SYMBOL(snd_card_free_in_thread);
	476	EXPORT_SYMBOL(snd_card_register);
	477	EXPORT_SYMBOL(snd_component_add);
	478	EXPORT_SYMBOL(snd_card_file_add);
	479	EXPORT_SYMBOL(snd_card_file_remove);
	480	#ifdef CONFIG_PM
	481	EXPORT_SYMBOL(snd_power_wait);
1da177e4 LT	482	#endif
	483	/* device.c */
	484	EXPORT_SYMBOL(snd_device_new);
	485	EXPORT_SYMBOL(snd_device_register);
	486	EXPORT_SYMBOL(snd_device_free);
1da177e4	487	/* isadma.c */
276bd31c	488	#ifdef CONFIG_ISA_DMA_API
1da177e4 LT	489	EXPORT_SYMBOL(snd_dma_program);
	490	EXPORT_SYMBOL(snd_dma_disable);
	491	EXPORT_SYMBOL(snd_dma_pointer);
	492	#endif
	493	/* info.c */
	494	#ifdef CONFIG_PROC_FS
	495	EXPORT_SYMBOL(snd_seq_root);
	496	EXPORT_SYMBOL(snd_iprintf);
	497	EXPORT_SYMBOL(snd_info_get_line);
	498	EXPORT_SYMBOL(snd_info_get_str);
	499	EXPORT_SYMBOL(snd_info_create_module_entry);
	500	EXPORT_SYMBOL(snd_info_create_card_entry);
	501	EXPORT_SYMBOL(snd_info_free_entry);
	502	EXPORT_SYMBOL(snd_info_register);
	503	EXPORT_SYMBOL(snd_info_unregister);
	504	EXPORT_SYMBOL(snd_card_proc_new);
	505	#endif
	506	/* info_oss.c */
	507	#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
	508	EXPORT_SYMBOL(snd_oss_info_register);
	509	#endif
	510	/* control.c */
	511	EXPORT_SYMBOL(snd_ctl_new);
	512	EXPORT_SYMBOL(snd_ctl_new1);
	513	EXPORT_SYMBOL(snd_ctl_free_one);
	514	EXPORT_SYMBOL(snd_ctl_add);
	515	EXPORT_SYMBOL(snd_ctl_remove);
	516	EXPORT_SYMBOL(snd_ctl_remove_id);
	517	EXPORT_SYMBOL(snd_ctl_rename_id);
	518	EXPORT_SYMBOL(snd_ctl_find_numid);
	519	EXPORT_SYMBOL(snd_ctl_find_id);
	520	EXPORT_SYMBOL(snd_ctl_notify);
	521	EXPORT_SYMBOL(snd_ctl_register_ioctl);
	522	EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
	523	#ifdef CONFIG_COMPAT
	524	EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
	525	EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
	526	#endif
	527	EXPORT_SYMBOL(snd_ctl_elem_read);
	528	EXPORT_SYMBOL(snd_ctl_elem_write);
	529	/* misc.c */
b1d5776d	530	EXPORT_SYMBOL(release_and_free_resource);
1da177e4 LT	531	#ifdef CONFIG_SND_VERBOSE_PRINTK
	532	EXPORT_SYMBOL(snd_verbose_printk);
	533	#endif
	534	#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
	535	EXPORT_SYMBOL(snd_verbose_printd);
1da177e4	536	#endif