forked from Minki/linux
6983b7240c
Modules: ALSA Core Store the snd_minor structure pointers in one array instead of using a separate list for each card. This simplifies the mapping from device files to minor struct by removing the need to know about the encoding of the card number in the minor number. Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
253 lines
6.5 KiB
C
253 lines
6.5 KiB
C
/*
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* Advanced Linux Sound Architecture
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* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/driver.h>
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#ifdef CONFIG_SND_OSSEMUL
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#if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE))
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#error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel."
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#endif
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#include <linux/init.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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#define SNDRV_OSS_MINORS 128
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static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];
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static DECLARE_MUTEX(sound_oss_mutex);
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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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snd_assert(card != NULL && dev <= 1, 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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snd_assert(card != NULL && dev <= 1, 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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snd_assert(card != NULL && dev <= 1, 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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snd_assert(minor >= 0 && minor < SNDRV_OSS_MINORS, 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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struct file_operations *f_ops, const char *name)
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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 = NULL;
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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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down(&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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if (card)
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carddev = card->dev;
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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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}
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up(&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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up(&sound_oss_mutex);
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kfree(preg);
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return -EBUSY;
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}
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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 (minor < 0)
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return minor;
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down(&sound_oss_mutex);
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mptr = snd_oss_minors[minor];
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if (mptr == NULL) {
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up(&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[minor] = NULL;
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up(&sound_oss_mutex);
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kfree(mptr);
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return 0;
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}
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/*
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* INFO PART
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*/
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#ifdef CONFIG_PROC_FS
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static struct snd_info_entry *snd_minor_info_oss_entry = NULL;
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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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down(&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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up(&sound_oss_mutex);
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}
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#endif /* CONFIG_PROC_FS */
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int __init snd_minor_info_oss_init(void)
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{
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#ifdef CONFIG_PROC_FS
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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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entry->c.text.read_size = PAGE_SIZE;
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entry->c.text.read = snd_minor_info_oss_read;
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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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entry = NULL;
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}
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}
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snd_minor_info_oss_entry = entry;
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#endif
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return 0;
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}
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int __exit snd_minor_info_oss_done(void)
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{
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#ifdef CONFIG_PROC_FS
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if (snd_minor_info_oss_entry)
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snd_info_unregister(snd_minor_info_oss_entry);
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#endif
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return 0;
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}
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#endif /* CONFIG_SND_OSSEMUL */
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