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244 lines
6.4 KiB
244 lines
6.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Advanced Linux Sound Architecture |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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*/ |
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#include <linux/init.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/time.h> |
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#include <sound/core.h> |
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#include <sound/minors.h> |
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#include <sound/info.h> |
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#include <linux/sound.h> |
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#include <linux/mutex.h> |
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#define SNDRV_OSS_MINORS 256 |
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static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS]; |
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static DEFINE_MUTEX(sound_oss_mutex); |
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/* NOTE: This function increments the refcount of the associated card like |
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* snd_lookup_minor_data(); the caller must call snd_card_unref() appropriately |
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*/ |
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void *snd_lookup_oss_minor_data(unsigned int minor, int type) |
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{ |
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struct snd_minor *mreg; |
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void *private_data; |
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if (minor >= ARRAY_SIZE(snd_oss_minors)) |
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return NULL; |
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mutex_lock(&sound_oss_mutex); |
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mreg = snd_oss_minors[minor]; |
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if (mreg && mreg->type == type) { |
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private_data = mreg->private_data; |
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if (private_data && mreg->card_ptr) |
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get_device(&mreg->card_ptr->card_dev); |
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} else |
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private_data = NULL; |
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mutex_unlock(&sound_oss_mutex); |
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return private_data; |
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} |
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EXPORT_SYMBOL(snd_lookup_oss_minor_data); |
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static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev) |
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{ |
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int minor; |
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switch (type) { |
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case SNDRV_OSS_DEVICE_TYPE_MIXER: |
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if (snd_BUG_ON(!card || dev < 0 || dev > 1)) |
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return -EINVAL; |
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minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER)); |
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break; |
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case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: |
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minor = SNDRV_MINOR_OSS_SEQUENCER; |
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break; |
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case SNDRV_OSS_DEVICE_TYPE_MUSIC: |
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minor = SNDRV_MINOR_OSS_MUSIC; |
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break; |
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case SNDRV_OSS_DEVICE_TYPE_PCM: |
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if (snd_BUG_ON(!card || dev < 0 || dev > 1)) |
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return -EINVAL; |
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minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM)); |
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break; |
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case SNDRV_OSS_DEVICE_TYPE_MIDI: |
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if (snd_BUG_ON(!card || dev < 0 || dev > 1)) |
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return -EINVAL; |
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minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI)); |
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break; |
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case SNDRV_OSS_DEVICE_TYPE_DMFM: |
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minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM); |
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break; |
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case SNDRV_OSS_DEVICE_TYPE_SNDSTAT: |
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minor = SNDRV_MINOR_OSS_SNDSTAT; |
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break; |
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default: |
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return -EINVAL; |
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} |
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if (minor < 0 || minor >= SNDRV_OSS_MINORS) |
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return -EINVAL; |
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return minor; |
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} |
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int snd_register_oss_device(int type, struct snd_card *card, int dev, |
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const struct file_operations *f_ops, void *private_data) |
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{ |
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int minor = snd_oss_kernel_minor(type, card, dev); |
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int minor_unit; |
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struct snd_minor *preg; |
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int cidx = SNDRV_MINOR_OSS_CARD(minor); |
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int track2 = -1; |
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int register1 = -1, register2 = -1; |
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struct device *carddev = snd_card_get_device_link(card); |
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if (card && card->number >= SNDRV_MINOR_OSS_DEVICES) |
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return 0; /* ignore silently */ |
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if (minor < 0) |
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return minor; |
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preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL); |
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if (preg == NULL) |
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return -ENOMEM; |
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preg->type = type; |
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preg->card = card ? card->number : -1; |
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preg->device = dev; |
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preg->f_ops = f_ops; |
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preg->private_data = private_data; |
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preg->card_ptr = card; |
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mutex_lock(&sound_oss_mutex); |
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snd_oss_minors[minor] = preg; |
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minor_unit = SNDRV_MINOR_OSS_DEVICE(minor); |
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switch (minor_unit) { |
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case SNDRV_MINOR_OSS_PCM: |
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track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); |
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break; |
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case SNDRV_MINOR_OSS_MIDI: |
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track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); |
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break; |
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case SNDRV_MINOR_OSS_MIDI1: |
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track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); |
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break; |
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} |
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register1 = register_sound_special_device(f_ops, minor, carddev); |
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if (register1 != minor) |
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goto __end; |
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if (track2 >= 0) { |
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register2 = register_sound_special_device(f_ops, track2, |
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carddev); |
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if (register2 != track2) |
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goto __end; |
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snd_oss_minors[track2] = preg; |
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} |
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mutex_unlock(&sound_oss_mutex); |
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return 0; |
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__end: |
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if (register2 >= 0) |
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unregister_sound_special(register2); |
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if (register1 >= 0) |
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unregister_sound_special(register1); |
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snd_oss_minors[minor] = NULL; |
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mutex_unlock(&sound_oss_mutex); |
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kfree(preg); |
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return -EBUSY; |
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} |
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EXPORT_SYMBOL(snd_register_oss_device); |
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int snd_unregister_oss_device(int type, struct snd_card *card, int dev) |
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{ |
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int minor = snd_oss_kernel_minor(type, card, dev); |
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int cidx = SNDRV_MINOR_OSS_CARD(minor); |
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int track2 = -1; |
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struct snd_minor *mptr; |
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if (card && card->number >= SNDRV_MINOR_OSS_DEVICES) |
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return 0; |
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if (minor < 0) |
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return minor; |
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mutex_lock(&sound_oss_mutex); |
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mptr = snd_oss_minors[minor]; |
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if (mptr == NULL) { |
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mutex_unlock(&sound_oss_mutex); |
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return -ENOENT; |
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} |
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unregister_sound_special(minor); |
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switch (SNDRV_MINOR_OSS_DEVICE(minor)) { |
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case SNDRV_MINOR_OSS_PCM: |
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track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); |
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break; |
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case SNDRV_MINOR_OSS_MIDI: |
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track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); |
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break; |
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case SNDRV_MINOR_OSS_MIDI1: |
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track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); |
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break; |
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} |
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if (track2 >= 0) { |
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unregister_sound_special(track2); |
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snd_oss_minors[track2] = NULL; |
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} |
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snd_oss_minors[minor] = NULL; |
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mutex_unlock(&sound_oss_mutex); |
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kfree(mptr); |
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return 0; |
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} |
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EXPORT_SYMBOL(snd_unregister_oss_device); |
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/* |
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* INFO PART |
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*/ |
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#ifdef CONFIG_SND_PROC_FS |
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static const char *snd_oss_device_type_name(int type) |
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{ |
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switch (type) { |
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case SNDRV_OSS_DEVICE_TYPE_MIXER: |
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return "mixer"; |
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case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: |
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case SNDRV_OSS_DEVICE_TYPE_MUSIC: |
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return "sequencer"; |
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case SNDRV_OSS_DEVICE_TYPE_PCM: |
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return "digital audio"; |
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case SNDRV_OSS_DEVICE_TYPE_MIDI: |
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return "raw midi"; |
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case SNDRV_OSS_DEVICE_TYPE_DMFM: |
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return "hardware dependent"; |
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default: |
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return "?"; |
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} |
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} |
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static void snd_minor_info_oss_read(struct snd_info_entry *entry, |
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struct snd_info_buffer *buffer) |
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{ |
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int minor; |
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struct snd_minor *mptr; |
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mutex_lock(&sound_oss_mutex); |
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for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) { |
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if (!(mptr = snd_oss_minors[minor])) |
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continue; |
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if (mptr->card >= 0) |
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snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor, |
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mptr->card, mptr->device, |
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snd_oss_device_type_name(mptr->type)); |
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else |
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snd_iprintf(buffer, "%3i: : %s\n", minor, |
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snd_oss_device_type_name(mptr->type)); |
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} |
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mutex_unlock(&sound_oss_mutex); |
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} |
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int __init snd_minor_info_oss_init(void) |
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{ |
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struct snd_info_entry *entry; |
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entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); |
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if (!entry) |
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return -ENOMEM; |
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entry->c.text.read = snd_minor_info_oss_read; |
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return snd_info_register(entry); /* freed in error path */ |
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} |
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#endif /* CONFIG_SND_PROC_FS */
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