dev_table.c

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/*
 * sound/oss/dev_table.c
 *
 * Device call tables.
 *
 *
 * Copyright (C) by Hannu Savolainen 1993-1997
 *
 * OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this software
 * for more info.
 */

#include <linux/init.h>

#include "sound_config.h"

struct audio_operations *audio_devs[MAX_AUDIO_DEV];
EXPORT_SYMBOL(audio_devs);

int num_audiodevs;
EXPORT_SYMBOL(num_audiodevs);

struct mixer_operations *mixer_devs[MAX_MIXER_DEV];
EXPORT_SYMBOL(mixer_devs);

int num_mixers;
EXPORT_SYMBOL(num_mixers);

struct synth_operations *synth_devs[MAX_SYNTH_DEV+MAX_MIDI_DEV];
EXPORT_SYMBOL(synth_devs);

int num_synths;

struct midi_operations *midi_devs[MAX_MIDI_DEV];
EXPORT_SYMBOL(midi_devs);

int num_midis;
EXPORT_SYMBOL(num_midis);

struct sound_timer_operations *sound_timer_devs[MAX_TIMER_DEV] = {
    &default_sound_timer, NULL
};
EXPORT_SYMBOL(sound_timer_devs);

int num_sound_timers = 1;


static int sound_alloc_audiodev(void);

int sound_install_audiodrv(int vers, char *name, struct audio_driver *driver,
            int driver_size, int flags, unsigned int format_mask,
            void *devc, int dma1, int dma2)
{
    struct audio_driver *d;
    struct audio_operations *op;
    int num;

    if (vers != AUDIO_DRIVER_VERSION || driver_size > sizeof(struct audio_driver)) {
        printk(KERN_ERR "Sound: Incompatible audio driver for %s\n", name);
        return -(EINVAL);
    }
    num = sound_alloc_audiodev();

    if (num == -1) {
        printk(KERN_ERR "sound: Too many audio drivers\n");
        return -(EBUSY);
    }
    d = (struct audio_driver *) (sound_mem_blocks[sound_nblocks] = vmalloc(sizeof(struct audio_driver)));
    sound_nblocks++;
    if (sound_nblocks >= MAX_MEM_BLOCKS)
        sound_nblocks = MAX_MEM_BLOCKS - 1;

    op = (struct audio_operations *) (sound_mem_blocks[sound_nblocks] = vzalloc(sizeof(struct audio_operations)));
    sound_nblocks++;
    if (sound_nblocks >= MAX_MEM_BLOCKS)
        sound_nblocks = MAX_MEM_BLOCKS - 1;

    if (d == NULL || op == NULL) {
        printk(KERN_ERR "Sound: Can't allocate driver for (%s)\n", name);
        sound_unload_audiodev(num);
        return -(ENOMEM);
    }
    init_waitqueue_head(&op->in_sleeper);
    init_waitqueue_head(&op->out_sleeper);  
    init_waitqueue_head(&op->poll_sleeper);
    if (driver_size < sizeof(struct audio_driver))
        memset((char *) d, 0, sizeof(struct audio_driver));

    memcpy((char *) d, (char *) driver, driver_size);

    op->d = d;
    strlcpy(op->name, name, sizeof(op->name));
    op->flags = flags;
    op->format_mask = format_mask;
    op->devc = devc;

    /*
     *    Hardcoded defaults
     */
    audio_devs[num] = op;

    DMAbuf_init(num, dma1, dma2);

    audio_init_devices();
    return num;
}
EXPORT_SYMBOL(sound_install_audiodrv);

int sound_install_mixer(int vers, char *name, struct mixer_operations *driver,
    int driver_size, void *devc)
{
    struct mixer_operations *op;

    int n = sound_alloc_mixerdev();

    if (n == -1) {
        printk(KERN_ERR "Sound: Too many mixer drivers\n");
        return -EBUSY;
    }
    if (vers != MIXER_DRIVER_VERSION ||
        driver_size > sizeof(struct mixer_operations)) {
        printk(KERN_ERR "Sound: Incompatible mixer driver for %s\n", name);
        return -EINVAL;
    }
    
    /* FIXME: This leaks a mixer_operations struct every time its called
       until you unload sound! */
       
    op = (struct mixer_operations *) (sound_mem_blocks[sound_nblocks] = vzalloc(sizeof(struct mixer_operations)));
    sound_nblocks++;
    if (sound_nblocks >= MAX_MEM_BLOCKS)
        sound_nblocks = MAX_MEM_BLOCKS - 1;

    if (op == NULL) {
        printk(KERN_ERR "Sound: Can't allocate mixer driver for (%s)\n", name);
        return -ENOMEM;
    }
    memcpy((char *) op, (char *) driver, driver_size);

    strlcpy(op->name, name, sizeof(op->name));
    op->devc = devc;

    mixer_devs[n] = op;
    return n;
}
EXPORT_SYMBOL(sound_install_mixer);

void sound_unload_audiodev(int dev)
{
    if (dev != -1) {
        DMAbuf_deinit(dev);
        audio_devs[dev] = NULL;
        unregister_sound_dsp((dev<<4)+3);
    }
}
EXPORT_SYMBOL(sound_unload_audiodev);

static int sound_alloc_audiodev(void)
{ 
    int i = register_sound_dsp(&oss_sound_fops, -1);
    if(i==-1)
        return i;
    i>>=4;
    if(i>=num_audiodevs)
        num_audiodevs = i + 1;
    return i;
}

int sound_alloc_mididev(void)
{
    int i = register_sound_midi(&oss_sound_fops, -1);
    if(i==-1)
        return i;
    i>>=4;
    if(i>=num_midis)
        num_midis = i + 1;
    return i;
}
EXPORT_SYMBOL(sound_alloc_mididev);

int sound_alloc_synthdev(void)
{
    int i;

    for (i = 0; i < MAX_SYNTH_DEV; i++) {
        if (synth_devs[i] == NULL) {
            if (i >= num_synths)
                num_synths++;
            return i;
        }
    }
    return -1;
}
EXPORT_SYMBOL(sound_alloc_synthdev);

int sound_alloc_mixerdev(void)
{
    int i = register_sound_mixer(&oss_sound_fops, -1);
    if(i==-1)
        return -1;
    i>>=4;
    if(i>=num_mixers)
        num_mixers = i + 1;
    return i;
}
EXPORT_SYMBOL(sound_alloc_mixerdev);

int sound_alloc_timerdev(void)
{
    int i;

    for (i = 0; i < MAX_TIMER_DEV; i++) {
        if (sound_timer_devs[i] == NULL) {
            if (i >= num_sound_timers)
                num_sound_timers++;
            return i;
        }
    }
    return -1;
}
EXPORT_SYMBOL(sound_alloc_timerdev);

void sound_unload_mixerdev(int dev)
{
    if (dev != -1) {
        mixer_devs[dev] = NULL;
        unregister_sound_mixer(dev<<4);
        num_mixers--;
    }
}
EXPORT_SYMBOL(sound_unload_mixerdev);

void sound_unload_mididev(int dev)
{
    if (dev != -1) {
        midi_devs[dev] = NULL;
        unregister_sound_midi((dev<<4)+2);
    }
}
EXPORT_SYMBOL(sound_unload_mididev);

void sound_unload_synthdev(int dev)
{
    if (dev != -1)
        synth_devs[dev] = NULL;
}
EXPORT_SYMBOL(sound_unload_synthdev);

void sound_unload_timerdev(int dev)
{
    if (dev != -1)
        sound_timer_devs[dev] = NULL;
}
EXPORT_SYMBOL(sound_unload_timerdev);