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-rw-r--r--sound/core/sound_oss.c195
1 files changed, 113 insertions, 82 deletions
diff --git a/sound/core/sound_oss.c b/sound/core/sound_oss.c
index e401c670329..573a65eb2b7 100644
--- a/sound/core/sound_oss.c
+++ b/sound/core/sound_oss.c
@@ -1,6 +1,6 @@
/*
* Advanced Linux Sound Architecture
- * Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
*
*
* This program is free software; you can redistribute it and/or modify
@@ -19,48 +19,59 @@
*
*/
-#include <sound/driver.h>
-
#ifdef CONFIG_SND_OSSEMUL
-#if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
+#if !IS_ENABLED(CONFIG_SOUND)
#error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
#endif
#include <linux/init.h>
+#include <linux/export.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/info.h>
#include <linux/sound.h>
+#include <linux/mutex.h>
-#define SNDRV_OS_MINORS 256
-
-static struct list_head snd_oss_minors_hash[SNDRV_CARDS];
+#define SNDRV_OSS_MINORS 256
-static DECLARE_MUTEX(sound_oss_mutex);
+static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
+static DEFINE_MUTEX(sound_oss_mutex);
-static snd_minor_t *snd_oss_minor_search(int minor)
+/* NOTE: This function increments the refcount of the associated card like
+ * snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately
+ */
+void *snd_lookup_oss_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_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
- mptr = list_entry(list, snd_minor_t, list);
- if (mptr->number == minor)
- return mptr;
- }
- return NULL;
+ if (minor >= ARRAY_SIZE(snd_oss_minors))
+ return NULL;
+ mutex_lock(&sound_oss_mutex);
+ mreg = snd_oss_minors[minor];
+ if (mreg && mreg->type == type) {
+ private_data = mreg->private_data;
+ if (private_data && mreg->card_ptr)
+ get_device(&mreg->card_ptr->card_dev);
+ } else
+ private_data = NULL;
+ mutex_unlock(&sound_oss_mutex);
+ return private_data;
}
-static int snd_oss_kernel_minor(int type, snd_card_t * card, int dev)
+EXPORT_SYMBOL(snd_lookup_oss_minor_data);
+
+static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
{
int minor;
switch (type) {
case SNDRV_OSS_DEVICE_TYPE_MIXER:
- snd_assert(card != NULL && dev <= 1, return -EINVAL);
+ if (snd_BUG_ON(!card || dev < 0 || dev > 1))
+ return -EINVAL;
minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER));
break;
case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
@@ -70,11 +81,13 @@ static int snd_oss_kernel_minor(int type, snd_card_t * card, int dev)
minor = SNDRV_MINOR_OSS_MUSIC;
break;
case SNDRV_OSS_DEVICE_TYPE_PCM:
- snd_assert(card != NULL && dev <= 1, return -EINVAL);
+ if (snd_BUG_ON(!card || dev < 0 || dev > 1))
+ return -EINVAL;
minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM));
break;
case SNDRV_OSS_DEVICE_TYPE_MIDI:
- snd_assert(card != NULL && dev <= 1, return -EINVAL);
+ if (snd_BUG_ON(!card || dev < 0 || dev > 1))
+ return -EINVAL;
minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI));
break;
case SNDRV_OSS_DEVICE_TYPE_DMFM:
@@ -86,30 +99,37 @@ static int snd_oss_kernel_minor(int type, snd_card_t * card, int dev)
default:
return -EINVAL;
}
- snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL);
+ if (minor < 0 || minor >= SNDRV_OSS_MINORS)
+ return -EINVAL;
return minor;
}
-int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name)
+int snd_register_oss_device(int type, struct snd_card *card, int dev,
+ const struct file_operations *f_ops, void *private_data)
{
int minor = snd_oss_kernel_minor(type, card, dev);
int minor_unit;
- snd_minor_t *preg;
+ struct snd_minor *preg;
int cidx = SNDRV_MINOR_OSS_CARD(minor);
int track2 = -1;
int register1 = -1, register2 = -1;
- struct device *carddev = NULL;
+ struct device *carddev = snd_card_get_device_link(card);
+ if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
+ return 0; /* ignore silently */
if (minor < 0)
return minor;
- preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL);
+ preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
if (preg == NULL)
return -ENOMEM;
- *preg = *reg;
- preg->number = minor;
+ preg->type = type;
+ preg->card = card ? card->number : -1;
preg->device = dev;
- down(&sound_oss_mutex);
- list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
+ preg->f_ops = f_ops;
+ preg->private_data = private_data;
+ preg->card_ptr = card;
+ mutex_lock(&sound_oss_mutex);
+ snd_oss_minors[minor] = preg;
minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
switch (minor_unit) {
case SNDRV_MINOR_OSS_PCM:
@@ -122,17 +142,17 @@ int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t *
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
break;
}
- if (card)
- carddev = card->dev;
- register1 = register_sound_special_device(reg->f_ops, minor, carddev);
+ register1 = register_sound_special_device(f_ops, minor, carddev);
if (register1 != minor)
goto __end;
if (track2 >= 0) {
- register2 = register_sound_special_device(reg->f_ops, track2, carddev);
+ register2 = register_sound_special_device(f_ops, track2,
+ carddev);
if (register2 != track2)
goto __end;
+ snd_oss_minors[track2] = preg;
}
- up(&sound_oss_mutex);
+ mutex_unlock(&sound_oss_mutex);
return 0;
__end:
@@ -140,25 +160,29 @@ int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t *
unregister_sound_special(register2);
if (register1 >= 0)
unregister_sound_special(register1);
- list_del(&preg->list);
- up(&sound_oss_mutex);
+ snd_oss_minors[minor] = NULL;
+ mutex_unlock(&sound_oss_mutex);
kfree(preg);
return -EBUSY;
}
-int snd_unregister_oss_device(int type, snd_card_t * card, int dev)
+EXPORT_SYMBOL(snd_register_oss_device);
+
+int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
{
int minor = snd_oss_kernel_minor(type, card, dev);
int cidx = SNDRV_MINOR_OSS_CARD(minor);
int track2 = -1;
- snd_minor_t *mptr;
+ struct snd_minor *mptr;
+ if (card && card->number >= SNDRV_MINOR_OSS_DEVICES)
+ return 0;
if (minor < 0)
return minor;
- down(&sound_oss_mutex);
- mptr = snd_oss_minor_search(minor);
+ mutex_lock(&sound_oss_mutex);
+ mptr = snd_oss_minors[minor];
if (mptr == NULL) {
- up(&sound_oss_mutex);
+ mutex_unlock(&sound_oss_mutex);
return -ENOENT;
}
unregister_sound_special(minor);
@@ -173,54 +197,73 @@ int snd_unregister_oss_device(int type, snd_card_t * card, int dev)
track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1);
break;
}
- if (track2 >= 0)
+ if (track2 >= 0) {
unregister_sound_special(track2);
- list_del(&mptr->list);
- up(&sound_oss_mutex);
+ snd_oss_minors[track2] = NULL;
+ }
+ snd_oss_minors[minor] = NULL;
+ mutex_unlock(&sound_oss_mutex);
kfree(mptr);
return 0;
}
+EXPORT_SYMBOL(snd_unregister_oss_device);
+
/*
* INFO PART
*/
#ifdef CONFIG_PROC_FS
-static snd_info_entry_t *snd_minor_info_oss_entry = NULL;
+static struct snd_info_entry *snd_minor_info_oss_entry;
-static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
+static const char *snd_oss_device_type_name(int type)
{
- int card, dev;
- struct list_head *list;
- snd_minor_t *mptr;
-
- down(&sound_oss_mutex);
- for (card = 0; card < SNDRV_CARDS; card++) {
- list_for_each(list, &snd_oss_minors_hash[card]) {
- mptr = list_entry(list, snd_minor_t, list);
- dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
- if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
- dev != SNDRV_MINOR_OSS_SEQUENCER &&
- dev != SNDRV_MINOR_OSS_MUSIC)
- snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
- else
- snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment);
- }
+ switch (type) {
+ case SNDRV_OSS_DEVICE_TYPE_MIXER:
+ return "mixer";
+ case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
+ case SNDRV_OSS_DEVICE_TYPE_MUSIC:
+ return "sequencer";
+ case SNDRV_OSS_DEVICE_TYPE_PCM:
+ return "digital audio";
+ case SNDRV_OSS_DEVICE_TYPE_MIDI:
+ return "raw midi";
+ case SNDRV_OSS_DEVICE_TYPE_DMFM:
+ return "hardware dependent";
+ default:
+ return "?";
}
- up(&sound_oss_mutex);
}
-#endif /* CONFIG_PROC_FS */
+static void snd_minor_info_oss_read(struct snd_info_entry *entry,
+ struct snd_info_buffer *buffer)
+{
+ int minor;
+ struct snd_minor *mptr;
+
+ mutex_lock(&sound_oss_mutex);
+ for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {
+ if (!(mptr = snd_oss_minors[minor]))
+ continue;
+ if (mptr->card >= 0)
+ snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,
+ mptr->card, mptr->device,
+ snd_oss_device_type_name(mptr->type));
+ else
+ snd_iprintf(buffer, "%3i: : %s\n", minor,
+ snd_oss_device_type_name(mptr->type));
+ }
+ mutex_unlock(&sound_oss_mutex);
+}
+
int __init snd_minor_info_oss_init(void)
{
-#ifdef CONFIG_PROC_FS
- snd_info_entry_t *entry;
+ struct snd_info_entry *entry;
entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);
if (entry) {
- entry->c.text.read_size = PAGE_SIZE;
entry->c.text.read = snd_minor_info_oss_read;
if (snd_info_register(entry) < 0) {
snd_info_free_entry(entry);
@@ -228,26 +271,14 @@ int __init snd_minor_info_oss_init(void)
}
}
snd_minor_info_oss_entry = entry;
-#endif
return 0;
}
int __exit snd_minor_info_oss_done(void)
{
-#ifdef CONFIG_PROC_FS
- if (snd_minor_info_oss_entry)
- snd_info_unregister(snd_minor_info_oss_entry);
-#endif
- return 0;
-}
-
-int __init snd_oss_init_module(void)
-{
- int card;
-
- for (card = 0; card < SNDRV_CARDS; card++)
- INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
+ snd_info_free_entry(snd_minor_info_oss_entry);
return 0;
}
+#endif /* CONFIG_PROC_FS */
#endif /* CONFIG_SND_OSSEMUL */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 23:36:54 +0000