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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
244 lines
6.4 KiB
C
244 lines
6.4 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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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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