#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/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;
+EXPORT_SYMBOL(snd_major);
+
static int cards_limit = 1;
static int device_mode = S_IFCHR | S_IRUGO | S_IWUGO;
* modules are loaded manually, this limit number increases, too.
*/
int snd_ecards_limit;
+EXPORT_SYMBOL(snd_ecards_limit);
-static struct list_head snd_minors_hash[SNDRV_CARDS];
-
-static DECLARE_MUTEX(sound_mutex);
+static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
+static DEFINE_MUTEX(sound_mutex);
extern struct class *sound_class;
*/
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)
+ if (snd_card_locked(card))
return;
if (card < 0 || card >= cards_limit)
return;
request_module("snd-card-%i", card);
}
+EXPORT_SYMBOL(snd_request_card);
+
static void snd_request_other(int minor)
{
char *str;
#endif /* request_module support */
-static struct snd_minor *snd_minor_search(int minor)
+/**
+ * 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 list_head *list;
- struct snd_minor *mptr;
-
- list_for_each(list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]) {
- mptr = list_entry(list, struct snd_minor, list);
- if (mptr->number == minor)
- return mptr;
- }
- return NULL;
+ 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;
}
+EXPORT_SYMBOL(snd_lookup_minor_data);
+
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);
+ unsigned int minor = iminor(inode);
struct snd_minor *mptr = NULL;
- struct file_operations *old_fops;
+ const struct file_operations *old_fops;
int err = 0;
- if (dev != SNDRV_MINOR_GLOBAL) {
- if (snd_cards[card] == NULL) {
+ if (minor >= ARRAY_SIZE(snd_minors))
+ return -ENODEV;
+ mptr = snd_minors[minor];
+ if (mptr == NULL) {
#ifdef CONFIG_KMOD
- snd_request_card(card);
+ int dev = SNDRV_MINOR_DEVICE(minor);
+ if (dev == SNDRV_MINOR_CONTROL) {
+ /* /dev/aloadC? */
+ int card = SNDRV_MINOR_CARD(minor);
if (snd_cards[card] == NULL)
-#endif
- return -ENODEV;
- }
- } else {
-#ifdef CONFIG_KMOD
- if ((mptr = snd_minor_search(minor)) == 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;
}
- 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)
.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;
snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
return minor;
}
+#endif
/**
* snd_register_device - Register the ALSA device file for the card
* @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.
* 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)
+ const struct file_operations *f_ops, void *private_data,
+ const char *name)
{
- int minor = snd_kernel_minor(type, card, dev);
+ int minor;
struct snd_minor *preg;
struct device *device = NULL;
- if (minor < 0)
- return minor;
snd_assert(name, return -EINVAL);
- preg = kzalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
+ preg = kmalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
if (preg == NULL)
return -ENOMEM;
- preg->number = minor;
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);
- if (snd_minor_search(minor)) {
- up(&sound_mutex);
+ 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 -EBUSY;
+ return minor;
}
- list_add_tail(&preg->list, &snd_minors_hash[SNDRV_MINOR_CARD(minor)]);
- if (strncmp(name, "controlC", 8) || card->number >= cards_limit)
+ 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);
+ mutex_unlock(&sound_mutex);
return 0;
}
+EXPORT_SYMBOL(snd_register_device);
+
/**
* snd_unregister_device - unregister the device on the given card
* @type: the device type, SNDRV_DEVICE_TYPE_XXX
*/
int snd_unregister_device(int type, struct snd_card *card, int dev)
{
- int minor = snd_kernel_minor(type, card, dev);
+ int cardnum, minor;
struct snd_minor *mptr;
- if (minor < 0)
- return minor;
- down(&sound_mutex);
- if ((mptr = snd_minor_search(minor)) == NULL) {
- up(&sound_mutex);
+ 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 (strncmp(mptr->name, "controlC", 8) || card->number >= cards_limit) /* created in sound.c */
+ 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));
- list_del(&mptr->list);
- up(&sound_mutex);
+ snd_minors[minor] = NULL;
+ mutex_unlock(&sound_mutex);
kfree(mptr);
return 0;
}
+EXPORT_SYMBOL(snd_unregister_device);
+
+#ifdef CONFIG_PROC_FS
/*
* INFO PART
*/
-static struct snd_info_entry *snd_minor_info_entry = NULL;
+static struct snd_info_entry *snd_minor_info_entry;
static const char *snd_device_type_name(int type)
{
static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
- int card, device;
- struct list_head *list;
+ int minor;
struct snd_minor *mptr;
- down(&sound_mutex);
- for (card = 0; card < SNDRV_CARDS; card++) {
- list_for_each(list, &snd_minors_hash[card]) {
- mptr = list_entry(list, struct snd_minor, 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, snd_device_type_name(mptr->type));
- else
- snd_iprintf(buffer, "%3i: [%i] : %s\n", mptr->number, card, snd_device_type_name(mptr->type));
- } else {
- snd_iprintf(buffer, "%3i: : %s\n", mptr->number, snd_device_type_name(mptr->type));
- }
- }
+ 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));
}
- up(&sound_mutex);
+ mutex_unlock(&sound_mutex);
}
int __init snd_minor_info_init(void)
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);
snd_info_unregister(snd_minor_info_entry);
return 0;
}
+#endif /* CONFIG_PROC_FS */
/*
* 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);
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
projects / linux-2.6 / blobdiff