Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 *  Advanced Linux Sound Architecture

 *  Copyright (c) by Jaroslav Kysela <perex@perex.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>

#include <linux/mutex.h>

#define SNDRV_OSS_MINORS 128

static struct snd_minor *snd_oss_minors[SNDRV_OSS_MINORS];

static DEFINE_MUTEX(sound_oss_mutex);

void *snd_lookup_oss_minor_data(unsigned int minor, int type)

{

        struct snd_minor *mreg;

        void *private_data;

        if (minor >= ARRAY_SIZE(snd_oss_minors))

                return NULL;

        mutex_lock(&sound_oss_mutex);

        mreg = snd_oss_minors[minor];

        if (mreg && mreg->type == type)

                private_data = mreg->private_data;

        else

                private_data = NULL;

        mutex_unlock(&sound_oss_mutex);

        return private_data;

}

EXPORT_SYMBOL(snd_lookup_oss_minor_data);

static int snd_oss_kernel_minor(int type, struct snd_card *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_OSS_MINORS, return -EINVAL);

        return minor;

}

int snd_register_oss_device(int type, struct snd_card *card, int dev,

                            const struct file_operations *f_ops, void *private_data,

                            const char *name)

{

        int minor = snd_oss_kernel_minor(type, card, dev);

        int minor_unit;

        struct snd_minor *preg;

        int cidx = SNDRV_MINOR_OSS_CARD(minor);

        int track2 = -1;

        int register1 = -1, register2 = -1;

        struct device *carddev = snd_card_get_device_link(card);

        if (card && card->number >= 8)

                return 0; /* ignore silently */

        if (minor < 0)

                return minor;

        preg = kmalloc(sizeof(struct snd_minor), GFP_KERNEL);

        if (preg == NULL)

                return -ENOMEM;

        preg->type = type;

        preg->card = card ? card->number : -1;

        preg->device = dev;

        preg->f_ops = f_ops;

        preg->private_data = private_data;

        mutex_lock(&sound_oss_mutex);

        snd_oss_minors[minor] = preg;

        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_device(f_ops, minor, carddev);

        if (register1 != minor)

                goto __end;

        if (track2 >= 0) {

                register2 = register_sound_special_device(f_ops, track2,

                                                          carddev);

                if (register2 != track2)

                        goto __end;

                snd_oss_minors[track2] = preg;

        }

        mutex_unlock(&sound_oss_mutex);

        return 0;

      __end:

        if (register2 >= 0)

                unregister_sound_special(register2);

        if (register1 >= 0)

                unregister_sound_special(register1);

        snd_oss_minors[minor] = NULL;

        mutex_unlock(&sound_oss_mutex);

        kfree(preg);

        return -EBUSY;

}

EXPORT_SYMBOL(snd_register_oss_device);

int snd_unregister_oss_device(int type, struct snd_card *card, int dev)

{

        int minor = snd_oss_kernel_minor(type, card, dev);

        int cidx = SNDRV_MINOR_OSS_CARD(minor);

        int track2 = -1;

        struct snd_minor *mptr;

        if (card && card->number >= 8)

                return 0;

        if (minor < 0)

                return minor;

        mutex_lock(&sound_oss_mutex);

        mptr = snd_oss_minors[minor];

        if (mptr == NULL) {

                mutex_unlock(&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);

                snd_oss_minors[track2] = NULL;

        }

        snd_oss_minors[minor] = NULL;

        mutex_unlock(&sound_oss_mutex);

        kfree(mptr);

        return 0;

}

EXPORT_SYMBOL(snd_unregister_oss_device);

/*

 *  INFO PART

 */

#ifdef CONFIG_PROC_FS

static struct snd_info_entry *snd_minor_info_oss_entry;

static const char *snd_oss_device_type_name(int type)

{

        switch (type) {

        case SNDRV_OSS_DEVICE_TYPE_MIXER:

                return "mixer";

        case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:

        case SNDRV_OSS_DEVICE_TYPE_MUSIC:

                return "sequencer";

        case SNDRV_OSS_DEVICE_TYPE_PCM:

                return "digital audio";

        case SNDRV_OSS_DEVICE_TYPE_MIDI:

                return "raw midi";

        case SNDRV_OSS_DEVICE_TYPE_DMFM:

                return "hardware dependent";

        default:

                return "?";

        }

}

static void snd_minor_info_oss_read(struct snd_info_entry *entry,

                                    struct snd_info_buffer *buffer)

{

        int minor;

        struct snd_minor *mptr;

        mutex_lock(&sound_oss_mutex);

        for (minor = 0; minor < SNDRV_OSS_MINORS; ++minor) {

                if (!(mptr = snd_oss_minors[minor]))

                        continue;

                if (mptr->card >= 0)

                        snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", minor,

                                    mptr->card, mptr->device,

                                    snd_oss_device_type_name(mptr->type));

                else

                        snd_iprintf(buffer, "%3i:       : %s\n", minor,

                                    snd_oss_device_type_name(mptr->type));

        }

        mutex_unlock(&sound_oss_mutex);

}

int __init snd_minor_info_oss_init(void)

{

        struct snd_info_entry *entry;

        entry = snd_info_create_module_entry(THIS_MODULE, "devices", snd_oss_root);

        if (entry) {

                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;

        return 0;

}

int __exit snd_minor_info_oss_done(void)

{

        snd_info_free_entry(snd_minor_info_oss_entry);

        return 0;

}

#endif /* CONFIG_PROC_FS */

#endif /* CONFIG_SND_OSSEMUL */