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-rw-r--r--sound/core/sound.c238
1 files changed, 144 insertions, 94 deletions
diff --git a/sound/core/sound.c b/sound/core/sound.c
index 6e7cad1e947e..a8eda02bcf1c 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -23,6 +23,7 @@
#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>
@@ -32,7 +33,6 @@
#include <sound/initval.h>
#include <linux/kmod.h>
#include <linux/devfs_fs_kernel.h>
-#include <linux/platform_device.h>
#define SNDRV_OS_MINORS 256
@@ -60,8 +60,7 @@ MODULE_ALIAS_CHARDEV_MAJOR(CONFIG_SND_MAJOR);
*/
int snd_ecards_limit;
-static struct list_head snd_minors_hash[SNDRV_CARDS];
-
+static struct snd_minor *snd_minors[SNDRV_OS_MINORS];
static DECLARE_MUTEX(sound_mutex);
extern struct class *sound_class;
@@ -108,44 +107,61 @@ static void snd_request_other(int minor)
#endif /* request_module support */
-static snd_minor_t *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;
- snd_minor_t *mptr;
+ struct snd_minor *mreg;
+ void *private_data;
- 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;
+ 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)
{
- int minor = iminor(inode);
- int card = SNDRV_MINOR_CARD(minor);
- int dev = SNDRV_MINOR_DEVICE(minor);
- snd_minor_t *mptr = NULL;
+ unsigned int minor = iminor(inode);
+ struct snd_minor *mptr = NULL;
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)
@@ -164,7 +180,23 @@ static struct file_operations snd_fops =
.open = snd_open
};
-static int snd_kernel_minor(int type, snd_card_t * card, int dev)
+#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;
@@ -190,13 +222,15 @@ static int snd_kernel_minor(int type, snd_card_t * card, int dev)
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
- * @reg: the snd_minor_t record
+ * @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.
@@ -204,30 +238,39 @@ static int snd_kernel_minor(int type, snd_card_t * card, int dev)
*
* 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 snd_register_device(int type, struct snd_card *card, int dev,
+ struct file_operations *f_ops, void *private_data,
+ const char *name)
{
- int minor = snd_kernel_minor(type, card, dev);
- snd_minor_t *preg;
+ int minor;
+ struct snd_minor *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);
+ preg = kmalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
if (preg == NULL)
return -ENOMEM;
- *preg = *reg;
- 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)) {
+#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 -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;
@@ -248,61 +291,92 @@ int snd_register_device(int type, snd_card_t * card, int dev, snd_minor_t * reg,
*
* Returns zero if sucecessful, or a negative error code on failure
*/
-int snd_unregister_device(int type, snd_card_t * card, int dev)
+int snd_unregister_device(int type, struct snd_card *card, int dev)
{
- int minor = snd_kernel_minor(type, card, dev);
- snd_minor_t *mptr;
+ int cardnum, minor;
+ struct snd_minor *mptr;
- if (minor < 0)
- return minor;
+ cardnum = card ? card->number : -1;
down(&sound_mutex);
- if ((mptr = snd_minor_search(minor)) == NULL) {
+ 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 (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);
+ snd_minors[minor] = NULL;
up(&sound_mutex);
kfree(mptr);
return 0;
}
+#ifdef CONFIG_PROC_FS
/*
* INFO PART
*/
-static snd_info_entry_t *snd_minor_info_entry = NULL;
+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(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
+static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
{
- int card, device;
- struct list_head *list;
- snd_minor_t *mptr;
+ 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, snd_minor_t, 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, 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);
- }
- }
+ 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)
{
- snd_info_entry_t *entry;
+ struct snd_info_entry *entry;
entry = snd_info_create_module_entry(THIS_MODULE, "devices", NULL);
if (entry) {
@@ -323,27 +397,18 @@ int __exit snd_minor_info_done(void)
snd_info_unregister(snd_minor_info_entry);
return 0;
}
+#endif /* CONFIG_PROC_FS */
/*
* INIT PART
*/
-#ifdef CONFIG_SND_GENERIC_DRIVER
-extern struct platform_driver snd_generic_driver;
-#endif
-
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);
@@ -356,9 +421,6 @@ static int __init alsa_sound_init(void)
return -ENOMEM;
}
snd_info_minor_register();
-#ifdef CONFIG_SND_GENERIC_DRIVER
- platform_driver_register(&snd_generic_driver);
-#endif
for (controlnum = 0; controlnum < cards_limit; controlnum++)
devfs_mk_cdev(MKDEV(major, controlnum<<5), S_IFCHR | device_mode, "snd/controlC%d", controlnum);
#ifndef MODULE
@@ -374,9 +436,6 @@ static void __exit alsa_sound_exit(void)
for (controlnum = 0; controlnum < cards_limit; controlnum++)
devfs_remove("snd/controlC%d", controlnum);
-#ifdef CONFIG_SND_GENERIC_DRIVER
- platform_driver_unregister(&snd_generic_driver);
-#endif
snd_info_minor_unregister();
snd_info_done();
if (unregister_chrdev(major, "alsa") != 0)
@@ -395,9 +454,11 @@ 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);
@@ -415,19 +476,8 @@ EXPORT_SYMBOL(snd_card_register);
EXPORT_SYMBOL(snd_component_add);
EXPORT_SYMBOL(snd_card_file_add);
EXPORT_SYMBOL(snd_card_file_remove);
-#ifdef CONFIG_SND_GENERIC_DRIVER
-EXPORT_SYMBOL(snd_card_set_generic_dev);
-#endif
#ifdef CONFIG_PM
EXPORT_SYMBOL(snd_power_wait);
-EXPORT_SYMBOL(snd_card_set_pm_callback);
-#ifdef CONFIG_SND_GENERIC_DRIVER
-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);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.