/* * Advanced Linux Sound Architecture * Copyright (c) by Jaroslav Kysela * * * 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 * */ #include #ifdef CONFIG_SND_OSSEMUL #if !defined(CONFIG_SOUND) && !(defined(MODULE) && defined(CONFIG_SOUND_MODULE)) #error "Enable the OSS soundcore multiplexer (CONFIG_SOUND) in the kernel." #endif #include #include #include #include #include #include #include #define SNDRV_OS_MINORS 256 static struct list_head snd_oss_minors_hash[SNDRV_CARDS]; static DECLARE_MUTEX(sound_oss_mutex); static snd_minor_t *snd_oss_minor_search(int minor) { struct list_head *list; snd_minor_t *mptr; list_for_each(list, &snd_oss_minors_hash[SNDRV_MINOR_OSS_CARD(minor)]) { mptr = list_entry(list, snd_minor_t, list); if (mptr->number == minor) return mptr; } return NULL; } static int snd_oss_kernel_minor(int type, snd_card_t * card, int dev) { int minor; switch (type) { case SNDRV_OSS_DEVICE_TYPE_MIXER: snd_assert(card != NULL && dev <= 1, return -EINVAL); minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIXER1 : SNDRV_MINOR_OSS_MIXER)); break; case SNDRV_OSS_DEVICE_TYPE_SEQUENCER: minor = SNDRV_MINOR_OSS_SEQUENCER; break; case SNDRV_OSS_DEVICE_TYPE_MUSIC: minor = SNDRV_MINOR_OSS_MUSIC; break; case SNDRV_OSS_DEVICE_TYPE_PCM: snd_assert(card != NULL && dev <= 1, return -EINVAL); minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_PCM1 : SNDRV_MINOR_OSS_PCM)); break; case SNDRV_OSS_DEVICE_TYPE_MIDI: snd_assert(card != NULL && dev <= 1, return -EINVAL); minor = SNDRV_MINOR_OSS(card->number, (dev ? SNDRV_MINOR_OSS_MIDI1 : SNDRV_MINOR_OSS_MIDI)); break; case SNDRV_OSS_DEVICE_TYPE_DMFM: minor = SNDRV_MINOR_OSS(card->number, SNDRV_MINOR_OSS_DMFM); break; case SNDRV_OSS_DEVICE_TYPE_SNDSTAT: minor = SNDRV_MINOR_OSS_SNDSTAT; break; default: return -EINVAL; } snd_assert(minor >= 0 && minor < SNDRV_OS_MINORS, return -EINVAL); return minor; } int snd_register_oss_device(int type, snd_card_t * card, int dev, snd_minor_t * reg, const char *name) { int minor = snd_oss_kernel_minor(type, card, dev); int minor_unit; snd_minor_t *preg; int cidx = SNDRV_MINOR_OSS_CARD(minor); int track2 = -1; int register1 = -1, register2 = -1; if (minor < 0) return minor; preg = (snd_minor_t *)kmalloc(sizeof(snd_minor_t), GFP_KERNEL); if (preg == NULL) return -ENOMEM; *preg = *reg; preg->number = minor; preg->device = dev; down(&sound_oss_mutex); list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]); minor_unit = SNDRV_MINOR_OSS_DEVICE(minor); switch (minor_unit) { case SNDRV_MINOR_OSS_PCM: track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); break; case SNDRV_MINOR_OSS_MIDI: track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); break; case SNDRV_MINOR_OSS_MIDI1: track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); break; } register1 = register_sound_special(reg->f_ops, minor); if (register1 != minor) goto __end; if (track2 >= 0) { register2 = register_sound_special(reg->f_ops, track2); if (register2 != track2) goto __end; } up(&sound_oss_mutex); return 0; __end: if (register2 >= 0) unregister_sound_special(register2); if (register1 >= 0) unregister_sound_special(register1); list_del(&preg->list); up(&sound_oss_mutex); kfree(preg); return -EBUSY; } int snd_unregister_oss_device(int type, snd_card_t * card, int dev) { int minor = snd_oss_kernel_minor(type, card, dev); int cidx = SNDRV_MINOR_OSS_CARD(minor); int track2 = -1; snd_minor_t *mptr; if (minor < 0) return minor; down(&sound_oss_mutex); mptr = snd_oss_minor_search(minor); if (mptr == NULL) { up(&sound_oss_mutex); return -ENOENT; } unregister_sound_special(minor); switch (SNDRV_MINOR_OSS_DEVICE(minor)) { case SNDRV_MINOR_OSS_PCM: track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_AUDIO); break; case SNDRV_MINOR_OSS_MIDI: track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI); break; case SNDRV_MINOR_OSS_MIDI1: track2 = SNDRV_MINOR_OSS(cidx, SNDRV_MINOR_OSS_DMMIDI1); break; } if (track2 >= 0) unregister_sound_special(track2); list_del(&mptr->list); up(&sound_oss_mutex); kfree(mptr); return 0; } /* * INFO PART */ #ifdef CONFIG_PROC_FS static snd_info_entry_t *snd_minor_info_oss_entry = NULL; static void snd_minor_info_oss_read(snd_info_entry_t *entry, snd_info_buffer_t * buffer) { int card, dev; struct list_head *list; snd_minor_t *mptr; down(&sound_oss_mutex); for (card = 0; card < SNDRV_CARDS; card++) { list_for_each(list, &snd_oss_minors_hash[card]) { mptr = list_entry(list, snd_minor_t, list); dev = SNDRV_MINOR_OSS_DEVICE(mptr->number); if (dev != SNDRV_MINOR_OSS_SNDSTAT && dev != SNDRV_MINOR_OSS_SEQUENCER && dev != SNDRV_MINOR_OSS_MUSIC) snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment); else snd_iprintf(buffer, "%3i: : %s\n", mptr->number, mptr->comment); } } up(&sound_oss_mutex); } #endif /* CONFIG_PROC_FS */ int __init snd_minor_info_oss_init(void) { #ifdef CONFIG_PROC_FS snd_info_entry_t *entry; entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root); if (entry) { entry->c.text.read_size = PAGE_SIZE; entry->c.text.read = snd_minor_info_oss_read; if (snd_info_register(entry) < 0) { snd_info_free_entry(entry); entry = NULL; } } snd_minor_info_oss_entry = entry; #endif return 0; } int __exit snd_minor_info_oss_done(void) { #ifdef CONFIG_PROC_FS if (snd_minor_info_oss_entry) snd_info_unregister(snd_minor_info_oss_entry); #endif return 0; } int __init snd_oss_init_module(void) { int card; for (card = 0; card < SNDRV_CARDS; card++) INIT_LIST_HEAD(&snd_oss_minors_hash[card]); return 0; } #endif /* CONFIG_SND_OSSEMUL */