251 lines
6.6 KiB
C
251 lines
6.6 KiB
C
// 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 <perex@perex.cz>
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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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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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snd_oss_minors[track2] = NULL;
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snd_oss_minors[minor] = NULL;
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mutex_unlock(&sound_oss_mutex);
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/* call unregister_sound_special() outside sound_oss_mutex;
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* otherwise may deadlock, as it can trigger the release of a card
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*/
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unregister_sound_special(minor);
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if (track2 >= 0)
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unregister_sound_special(track2);
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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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mptr = snd_oss_minors[minor];
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if (!mptr)
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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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