diff options
Diffstat (limited to 'sound/core/sound_oss.c')
| -rw-r--r-- | sound/core/sound_oss.c | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/sound/core/sound_oss.c b/sound/core/sound_oss.c new file mode 100644 index 000000000000..de39d212bc15 --- /dev/null +++ b/sound/core/sound_oss.c @@ -0,0 +1,250 @@ +/* + * Advanced Linux Sound Architecture + * Copyright (c) by Jaroslav Kysela <perex@suse.cz> + * + * + * 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 <sound/driver.h> + +#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 <linux/init.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <sound/core.h> +#include <sound/minors.h> +#include <sound/info.h> +#include <linux/sound.h> + +#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 */ |