forked from Minki/linux
6983b7240c
Modules: ALSA Core Store the snd_minor structure pointers in one array instead of using a separate list for each card. This simplifies the mapping from device files to minor struct by removing the need to know about the encoding of the card number in the minor number. Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
472 lines
12 KiB
C
472 lines
12 KiB
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 */
|
|
|
|
static int snd_open(struct inode *inode, struct file *file)
|
|
{
|
|
int minor = iminor(inode);
|
|
int card = SNDRV_MINOR_CARD(minor);
|
|
int dev = SNDRV_MINOR_DEVICE(minor);
|
|
struct snd_minor *mptr = NULL;
|
|
struct file_operations *old_fops;
|
|
int err = 0;
|
|
|
|
if (dev != SNDRV_MINOR_GLOBAL) {
|
|
if (snd_cards[card] == NULL) {
|
|
#ifdef CONFIG_KMOD
|
|
snd_request_card(card);
|
|
if (snd_cards[card] == NULL)
|
|
#endif
|
|
return -ENODEV;
|
|
}
|
|
} else {
|
|
#ifdef CONFIG_KMOD
|
|
if ((mptr = snd_minors[minor]) == NULL)
|
|
snd_request_other(minor);
|
|
#endif
|
|
}
|
|
if (mptr == NULL && (mptr = snd_minors[minor]) == NULL)
|
|
return -ENODEV;
|
|
old_fops = file->f_op;
|
|
file->f_op = fops_get(mptr->f_ops);
|
|
if (file->f_op->open)
|
|
err = file->f_op->open(inode, file);
|
|
if (err) {
|
|
fops_put(file->f_op);
|
|
file->f_op = fops_get(old_fops);
|
|
}
|
|
fops_put(old_fops);
|
|
return err;
|
|
}
|
|
|
|
static struct file_operations snd_fops =
|
|
{
|
|
.owner = THIS_MODULE,
|
|
.open = snd_open
|
|
};
|
|
|
|
static int snd_kernel_minor(int type, struct snd_card *card, int dev)
|
|
{
|
|
int minor;
|
|
|
|
switch (type) {
|
|
case SNDRV_DEVICE_TYPE_SEQUENCER:
|
|
case SNDRV_DEVICE_TYPE_TIMER:
|
|
minor = type;
|
|
break;
|
|
case SNDRV_DEVICE_TYPE_CONTROL:
|
|
snd_assert(card != NULL, return -EINVAL);
|
|
minor = SNDRV_MINOR(card->number, type);
|
|
break;
|
|
case SNDRV_DEVICE_TYPE_HWDEP:
|
|
case SNDRV_DEVICE_TYPE_RAWMIDI:
|
|
case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
|
|
case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
|
|
snd_assert(card != NULL, return -EINVAL);
|
|
minor = SNDRV_MINOR(card->number, type + dev);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
|
|
return minor;
|
|
}
|
|
|
|
/**
|
|
* snd_register_device - Register the ALSA device file for the card
|
|
* @type: the device type, SNDRV_DEVICE_TYPE_XXX
|
|
* @card: the card instance
|
|
* @dev: the device index
|
|
* @f_ops: the file operations
|
|
* @name: the device file name
|
|
*
|
|
* Registers an ALSA device file for the given card.
|
|
* The operators have to be set in reg parameter.
|
|
*
|
|
* Retrurns zero if successful, or a negative error code on failure.
|
|
*/
|
|
int snd_register_device(int type, struct snd_card *card, int dev,
|
|
struct file_operations *f_ops, const char *name)
|
|
{
|
|
int minor = snd_kernel_minor(type, card, dev);
|
|
struct snd_minor *preg;
|
|
struct device *device = NULL;
|
|
|
|
if (minor < 0)
|
|
return minor;
|
|
snd_assert(name, return -EINVAL);
|
|
preg = 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;
|
|
strcpy(preg->name, name);
|
|
down(&sound_mutex);
|
|
if (snd_minors[minor]) {
|
|
up(&sound_mutex);
|
|
kfree(preg);
|
|
return -EBUSY;
|
|
}
|
|
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 minor = snd_kernel_minor(type, card, dev);
|
|
struct snd_minor *mptr;
|
|
|
|
if (minor < 0)
|
|
return minor;
|
|
down(&sound_mutex);
|
|
if ((mptr = snd_minors[minor]) == NULL) {
|
|
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: [%i-%2i]: %s\n",
|
|
minor, mptr->card, mptr->device,
|
|
snd_device_type_name(mptr->type));
|
|
else
|
|
snd_iprintf(buffer, "%3i: [%i] : %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);
|
|
#if defined(CONFIG_SND_OSSEMUL)
|
|
EXPORT_SYMBOL(snd_register_oss_device);
|
|
EXPORT_SYMBOL(snd_unregister_oss_device);
|
|
#endif
|
|
/* memory.c */
|
|
EXPORT_SYMBOL(copy_to_user_fromio);
|
|
EXPORT_SYMBOL(copy_from_user_toio);
|
|
/* init.c */
|
|
EXPORT_SYMBOL(snd_cards);
|
|
#if defined(CONFIG_SND_MIXER_OSS) || defined(CONFIG_SND_MIXER_OSS_MODULE)
|
|
EXPORT_SYMBOL(snd_mixer_oss_notify_callback);
|
|
#endif
|
|
EXPORT_SYMBOL(snd_card_new);
|
|
EXPORT_SYMBOL(snd_card_disconnect);
|
|
EXPORT_SYMBOL(snd_card_free);
|
|
EXPORT_SYMBOL(snd_card_free_in_thread);
|
|
EXPORT_SYMBOL(snd_card_register);
|
|
EXPORT_SYMBOL(snd_component_add);
|
|
EXPORT_SYMBOL(snd_card_file_add);
|
|
EXPORT_SYMBOL(snd_card_file_remove);
|
|
#ifdef CONFIG_PM
|
|
EXPORT_SYMBOL(snd_power_wait);
|
|
#endif
|
|
/* device.c */
|
|
EXPORT_SYMBOL(snd_device_new);
|
|
EXPORT_SYMBOL(snd_device_register);
|
|
EXPORT_SYMBOL(snd_device_free);
|
|
/* isadma.c */
|
|
#ifdef CONFIG_ISA_DMA_API
|
|
EXPORT_SYMBOL(snd_dma_program);
|
|
EXPORT_SYMBOL(snd_dma_disable);
|
|
EXPORT_SYMBOL(snd_dma_pointer);
|
|
#endif
|
|
/* info.c */
|
|
#ifdef CONFIG_PROC_FS
|
|
EXPORT_SYMBOL(snd_seq_root);
|
|
EXPORT_SYMBOL(snd_iprintf);
|
|
EXPORT_SYMBOL(snd_info_get_line);
|
|
EXPORT_SYMBOL(snd_info_get_str);
|
|
EXPORT_SYMBOL(snd_info_create_module_entry);
|
|
EXPORT_SYMBOL(snd_info_create_card_entry);
|
|
EXPORT_SYMBOL(snd_info_free_entry);
|
|
EXPORT_SYMBOL(snd_info_register);
|
|
EXPORT_SYMBOL(snd_info_unregister);
|
|
EXPORT_SYMBOL(snd_card_proc_new);
|
|
#endif
|
|
/* info_oss.c */
|
|
#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
|
|
EXPORT_SYMBOL(snd_oss_info_register);
|
|
#endif
|
|
/* control.c */
|
|
EXPORT_SYMBOL(snd_ctl_new);
|
|
EXPORT_SYMBOL(snd_ctl_new1);
|
|
EXPORT_SYMBOL(snd_ctl_free_one);
|
|
EXPORT_SYMBOL(snd_ctl_add);
|
|
EXPORT_SYMBOL(snd_ctl_remove);
|
|
EXPORT_SYMBOL(snd_ctl_remove_id);
|
|
EXPORT_SYMBOL(snd_ctl_rename_id);
|
|
EXPORT_SYMBOL(snd_ctl_find_numid);
|
|
EXPORT_SYMBOL(snd_ctl_find_id);
|
|
EXPORT_SYMBOL(snd_ctl_notify);
|
|
EXPORT_SYMBOL(snd_ctl_register_ioctl);
|
|
EXPORT_SYMBOL(snd_ctl_unregister_ioctl);
|
|
#ifdef CONFIG_COMPAT
|
|
EXPORT_SYMBOL(snd_ctl_register_ioctl_compat);
|
|
EXPORT_SYMBOL(snd_ctl_unregister_ioctl_compat);
|
|
#endif
|
|
EXPORT_SYMBOL(snd_ctl_elem_read);
|
|
EXPORT_SYMBOL(snd_ctl_elem_write);
|
|
/* misc.c */
|
|
EXPORT_SYMBOL(release_and_free_resource);
|
|
#ifdef CONFIG_SND_VERBOSE_PRINTK
|
|
EXPORT_SYMBOL(snd_verbose_printk);
|
|
#endif
|
|
#if defined(CONFIG_SND_DEBUG) && defined(CONFIG_SND_VERBOSE_PRINTK)
|
|
EXPORT_SYMBOL(snd_verbose_printd);
|
|
#endif
|