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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/sound/core/sound.c

492 строки
13 KiB
C
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/*
* 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/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_simple *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_SEQUENCER && dev != SNDRV_MINOR_TIMER) {
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_simple_device_add(sound_class, MKDEV(major, minor), device, 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_simple_device_remove(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_SEQUENCER) {
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
*/
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;
}
snd_memory_init();
if (snd_info_init() < 0) {
snd_memory_done();
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();
snd_memory_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 */
#ifdef CONFIG_SND_DEBUG_MEMORY
EXPORT_SYMBOL(snd_hidden_kmalloc);
EXPORT_SYMBOL(snd_hidden_kcalloc);
EXPORT_SYMBOL(snd_hidden_kfree);
EXPORT_SYMBOL(snd_hidden_vmalloc);
EXPORT_SYMBOL(snd_hidden_vfree);
#endif
EXPORT_SYMBOL(snd_kmalloc_strdup);
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);
EXPORT_SYMBOL(snd_card_set_pm_callback);
#if defined(CONFIG_PM) && defined(CONFIG_SND_GENERIC_PM)
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);
EXPORT_SYMBOL(snd_device_free_all);
/* isadma.c */
#ifdef CONFIG_ISA
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(snd_task_name);
#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
/* wrappers */
#ifdef CONFIG_SND_DEBUG_MEMORY
EXPORT_SYMBOL(snd_wrapper_kmalloc);
EXPORT_SYMBOL(snd_wrapper_kfree);
EXPORT_SYMBOL(snd_wrapper_vmalloc);
EXPORT_SYMBOL(snd_wrapper_vfree);
#endif
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