251 lines
6.5 KiB
C
251 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_OS_MINORS 256
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static struct list_head snd_oss_minors_hash[SNDRV_CARDS];
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static DECLARE_MUTEX(sound_oss_mutex);
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static snd_minor_t *snd_oss_minor_search(int minor)
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{
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struct list_head *list;
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snd_minor_t *mptr;
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list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) {
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mptr = list_entry(list, snd_minor_t, list);
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if (mptr->number == minor)
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return mptr;
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}
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return NULL;
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}
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static int snd_oss_kernel_minor(int type, snd_card_t * 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_OS_MINORS, return -EINVAL);
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return minor;
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}
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int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, 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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snd_minor_t *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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if (minor < 0)
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return minor;
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preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL);
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if (preg == NULL)
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return -ENOMEM;
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*preg = *reg;
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preg->number = minor;
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preg->device = dev;
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down(&sound_oss_mutex);
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list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
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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(reg->f_ops, minor);
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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(reg->f_ops, track2);
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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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list_del(&preg->list);
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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, snd_card_t * 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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snd_minor_t *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_minor_search(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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list_del(&mptr->list);
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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 snd_info_entry_t *snd_minor_info_oss_entry = NULL;
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static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer)
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{
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int card, dev;
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struct list_head *list;
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snd_minor_t *mptr;
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down(&sound_oss_mutex);
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for (card = 0; card < SNDRV_CARDS; card++) {
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list_for_each(list, &snd_oss_minors_hash[card]) {
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mptr = list_entry(list, snd_minor_t, list);
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dev = SNDRV_MINOR_OSS_DEVICE(mptr->number);
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if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
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dev != SNDRV_MINOR_OSS_SEQUENCER &&
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dev != SNDRV_MINOR_OSS_MUSIC)
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snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
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else
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snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment);
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}
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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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snd_info_entry_t *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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int __init snd_oss_init_module(void)
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{
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int card;
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for (card = 0; card < SNDRV_CARDS; card++)
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INIT_LIST_HEAD(&snd_oss_minors_hash[card]);
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return 0;
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}
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#endif /* CONFIG_SND_OSSEMUL */
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