diff options
Diffstat (limited to 'sound/core/sound_oss.c')
| -rw-r--r-- | sound/core/sound_oss.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/sound/core/sound_oss.c b/sound/core/sound_oss.c new file mode 100644 index 000000000..2751bf2ff --- /dev/null +++ b/sound/core/sound_oss.c @@ -0,0 +1,250 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Advanced Linux Sound Architecture + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + */ + +#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_OSS_MINORS 256 + +static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS]; +static DEFINE_MUTEX(sound_oss_mutex); + +/* 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 snd_minor *mreg; + void *private_data; + + 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; +} +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: + 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: + minor = SNDRV_MINOR_OSS_SEQUENCER; + break; + case SNDRV_OSS_DEVICE_TYPE_MUSIC: + minor = SNDRV_MINOR_OSS_MUSIC; + break; + case SNDRV_OSS_DEVICE_TYPE_PCM: + 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: + 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: + minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM); + break; + case SNDRV_OSS_DEVICE_TYPE_SNDSTAT: + minor = SNDRV_MINOR_OSS_SNDSTAT; + break; + default: + return -EINVAL; + } + if (minor < 0 || minor >= SNDRV_OSS_MINORS) + return -EINVAL; + return minor; +} + +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; + struct snd_minor *preg; + int cidx = SNDRV_MINOR_OSS_CARD(minor); + int track2 = -1; + int register1 = -1, register2 = -1; + 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 = kmalloc(sizeof(struct snd_minor), GFP_KERNEL); + if (preg == NULL) + return -ENOMEM; + preg->type = type; + preg->card = card ? card->number : -1; + preg->device = dev; + 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: + track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); + break; + case SNDRV_MINOR_OSS_MIDI: + track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); + break; + case SNDRV_MINOR_OSS_MIDI1: + track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); + break; + } + register1 = register_sound_special_device(f_ops, minor, carddev); + if (register1 != minor) + goto __end; + if (track2 >= 0) { + register2 = register_sound_special_device(f_ops, track2, + carddev); + if (register2 != track2) + goto __end; + snd_oss_minors[track2] = preg; + } + mutex_unlock(&sound_oss_mutex); + return 0; + + __end: + if (register2 >= 0) + unregister_sound_special(register2); + if (register1 >= 0) + unregister_sound_special(register1); + snd_oss_minors[minor] = NULL; + mutex_unlock(&sound_oss_mutex); + kfree(preg); + return -EBUSY; +} +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; + struct snd_minor *mptr; + + if (card && card->number >= SNDRV_MINOR_OSS_DEVICES) + return 0; + if (minor < 0) + return minor; + mutex_lock(&sound_oss_mutex); + mptr = snd_oss_minors[minor]; + if (mptr == NULL) { + mutex_unlock(&sound_oss_mutex); + return -ENOENT; + } + switch (SNDRV_MINOR_OSS_DEVICE(minor)) { + case SNDRV_MINOR_OSS_PCM: + track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); + break; + case SNDRV_MINOR_OSS_MIDI: + track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); + break; + case SNDRV_MINOR_OSS_MIDI1: + track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); + break; + } + if (track2 >= 0) + snd_oss_minors[track2] = NULL; + snd_oss_minors[minor] = NULL; + mutex_unlock(&sound_oss_mutex); + + /* call unregister_sound_special() outside sound_oss_mutex; + * otherwise may deadlock, as it can trigger the release of a card + */ + unregister_sound_special(minor); + if (track2 >= 0) + unregister_sound_special(track2); + + kfree(mptr); + return 0; +} +EXPORT_SYMBOL(snd_unregister_oss_device); + +/* + * INFO PART + */ + +#ifdef CONFIG_SND_PROC_FS +static const char *snd_oss_device_type_name(int type) +{ + 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 "?"; + } +} + +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) { + mptr = snd_oss_minors[minor]; + if (!mptr) + 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) +{ + struct snd_info_entry *entry; + + entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); + if (!entry) + return -ENOMEM; + entry->c.text.read = snd_minor_info_oss_read; + return snd_info_register(entry); /* freed in error path */ +} +#endif /* CONFIG_SND_PROC_FS */ |